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-rw-r--r--drivers/iio/common/Kconfig12
-rw-r--r--drivers/iio/common/Makefile17
-rw-r--r--drivers/iio/common/cros_ec_sensors/Kconfig32
-rw-r--r--drivers/iio/common/cros_ec_sensors/Makefile8
-rw-r--r--drivers/iio/common/cros_ec_sensors/cros_ec_lid_angle.c138
-rw-r--r--drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c329
-rw-r--r--drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c870
-rw-r--r--drivers/iio/common/hid-sensors/Kconfig30
-rw-r--r--drivers/iio/common/hid-sensors/Makefile8
-rw-r--r--drivers/iio/common/hid-sensors/hid-sensor-attributes.c590
-rw-r--r--drivers/iio/common/hid-sensors/hid-sensor-trigger.c327
-rw-r--r--drivers/iio/common/hid-sensors/hid-sensor-trigger.h23
-rw-r--r--drivers/iio/common/inv_sensors/Kconfig7
-rw-r--r--drivers/iio/common/inv_sensors/Makefile6
-rw-r--r--drivers/iio/common/inv_sensors/inv_sensors_timestamp.c194
-rw-r--r--drivers/iio/common/ms_sensors/Kconfig7
-rw-r--r--drivers/iio/common/ms_sensors/Makefile6
-rw-r--r--drivers/iio/common/ms_sensors/ms_sensors_i2c.c697
-rw-r--r--drivers/iio/common/ms_sensors/ms_sensors_i2c.h74
-rw-r--r--drivers/iio/common/scmi_sensors/Kconfig18
-rw-r--r--drivers/iio/common/scmi_sensors/Makefile5
-rw-r--r--drivers/iio/common/scmi_sensors/scmi_iio.c730
-rw-r--r--drivers/iio/common/ssp_sensors/Kconfig27
-rw-r--r--drivers/iio/common/ssp_sensors/Makefile9
-rw-r--r--drivers/iio/common/ssp_sensors/ssp.h246
-rw-r--r--drivers/iio/common/ssp_sensors/ssp_dev.c666
-rw-r--r--drivers/iio/common/ssp_sensors/ssp_iio.c99
-rw-r--r--drivers/iio/common/ssp_sensors/ssp_iio_sensor.h72
-rw-r--r--drivers/iio/common/ssp_sensors/ssp_spi.c601
-rw-r--r--drivers/iio/common/st_sensors/Kconfig15
-rw-r--r--drivers/iio/common/st_sensors/Makefile11
-rw-r--r--drivers/iio/common/st_sensors/st_sensors_buffer.c79
-rw-r--r--drivers/iio/common/st_sensors/st_sensors_core.c664
-rw-r--r--drivers/iio/common/st_sensors/st_sensors_core.h10
-rw-r--r--drivers/iio/common/st_sensors/st_sensors_i2c.c68
-rw-r--r--drivers/iio/common/st_sensors/st_sensors_spi.c120
-rw-r--r--drivers/iio/common/st_sensors/st_sensors_trigger.c242
37 files changed, 7057 insertions, 0 deletions
diff --git a/drivers/iio/common/Kconfig b/drivers/iio/common/Kconfig
new file mode 100644
index 0000000000..1ccb5ccf37
--- /dev/null
+++ b/drivers/iio/common/Kconfig
@@ -0,0 +1,12 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# IIO common modules
+#
+
+source "drivers/iio/common/cros_ec_sensors/Kconfig"
+source "drivers/iio/common/hid-sensors/Kconfig"
+source "drivers/iio/common/inv_sensors/Kconfig"
+source "drivers/iio/common/ms_sensors/Kconfig"
+source "drivers/iio/common/scmi_sensors/Kconfig"
+source "drivers/iio/common/ssp_sensors/Kconfig"
+source "drivers/iio/common/st_sensors/Kconfig"
diff --git a/drivers/iio/common/Makefile b/drivers/iio/common/Makefile
new file mode 100644
index 0000000000..d3e952239a
--- /dev/null
+++ b/drivers/iio/common/Makefile
@@ -0,0 +1,17 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for the IIO common modules.
+# Common modules contains modules, which can be shared among multiple
+# IIO modules. For example if the trigger processing is common for
+# multiple IIO modules then this can be moved to a common module
+# instead of duplicating in each module.
+#
+
+# When adding new entries keep the list in alphabetical order
+obj-y += cros_ec_sensors/
+obj-y += hid-sensors/
+obj-y += inv_sensors/
+obj-y += ms_sensors/
+obj-y += scmi_sensors/
+obj-y += ssp_sensors/
+obj-y += st_sensors/
diff --git a/drivers/iio/common/cros_ec_sensors/Kconfig b/drivers/iio/common/cros_ec_sensors/Kconfig
new file mode 100644
index 0000000000..fefad95727
--- /dev/null
+++ b/drivers/iio/common/cros_ec_sensors/Kconfig
@@ -0,0 +1,32 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Chrome OS Embedded Controller managed sensors library
+#
+config IIO_CROS_EC_SENSORS_CORE
+ tristate "ChromeOS EC Sensors Core"
+ depends on SYSFS && CROS_EC_SENSORHUB
+ select IIO_BUFFER
+ select IIO_TRIGGERED_BUFFER
+ help
+ Base module for the ChromeOS EC Sensors module.
+ Contains core functions used by other IIO CrosEC sensor
+ drivers.
+ Define common attributes and sysfs interrupt handler.
+
+config IIO_CROS_EC_SENSORS
+ tristate "ChromeOS EC Contiguous Sensors"
+ depends on IIO_CROS_EC_SENSORS_CORE
+ help
+ Module to handle 3d contiguous sensors like
+ Accelerometers, Gyroscope and Magnetometer that are
+ presented by the ChromeOS EC Sensor hub.
+ Creates an IIO device for each functions.
+
+config IIO_CROS_EC_SENSORS_LID_ANGLE
+ tristate "ChromeOS EC Sensor for lid angle"
+ depends on IIO_CROS_EC_SENSORS_CORE
+ help
+ Module to report the angle between lid and base for some
+ convertible devices.
+ This module is loaded when the EC can calculate the angle between the base
+ and the lid.
diff --git a/drivers/iio/common/cros_ec_sensors/Makefile b/drivers/iio/common/cros_ec_sensors/Makefile
new file mode 100644
index 0000000000..e0a33ab66d
--- /dev/null
+++ b/drivers/iio/common/cros_ec_sensors/Makefile
@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Makefile for sensors seen through the ChromeOS EC sensor hub.
+#
+
+obj-$(CONFIG_IIO_CROS_EC_SENSORS_CORE) += cros_ec_sensors_core.o
+obj-$(CONFIG_IIO_CROS_EC_SENSORS) += cros_ec_sensors.o
+obj-$(CONFIG_IIO_CROS_EC_SENSORS_LID_ANGLE) += cros_ec_lid_angle.o
diff --git a/drivers/iio/common/cros_ec_sensors/cros_ec_lid_angle.c b/drivers/iio/common/cros_ec_sensors/cros_ec_lid_angle.c
new file mode 100644
index 0000000000..119acb078a
--- /dev/null
+++ b/drivers/iio/common/cros_ec_sensors/cros_ec_lid_angle.c
@@ -0,0 +1,138 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/*
+ * cros_ec_lid_angle - Driver for CrOS EC lid angle sensor.
+ *
+ * Copyright 2018 Google, Inc
+ *
+ * This driver uses the cros-ec interface to communicate with the Chrome OS
+ * EC about counter sensors. Counters are presented through
+ * iio sysfs.
+ */
+
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/iio/buffer.h>
+#include <linux/iio/common/cros_ec_sensors_core.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/kfifo_buf.h>
+#include <linux/iio/trigger.h>
+#include <linux/iio/triggered_buffer.h>
+#include <linux/iio/trigger_consumer.h>
+#include <linux/kernel.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/platform_data/cros_ec_commands.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#define DRV_NAME "cros-ec-lid-angle"
+
+/*
+ * One channel for the lid angle, the other for timestamp.
+ */
+static const struct iio_chan_spec cros_ec_lid_angle_channels[] = {
+ {
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+ .scan_type.realbits = CROS_EC_SENSOR_BITS,
+ .scan_type.storagebits = CROS_EC_SENSOR_BITS,
+ .scan_type.sign = 'u',
+ .type = IIO_ANGL
+ },
+ IIO_CHAN_SOFT_TIMESTAMP(1)
+};
+
+/* State data for ec_sensors iio driver. */
+struct cros_ec_lid_angle_state {
+ /* Shared by all sensors */
+ struct cros_ec_sensors_core_state core;
+};
+
+static int cros_ec_sensors_read_lid_angle(struct iio_dev *indio_dev,
+ unsigned long scan_mask, s16 *data)
+{
+ struct cros_ec_sensors_core_state *st = iio_priv(indio_dev);
+ int ret;
+
+ st->param.cmd = MOTIONSENSE_CMD_LID_ANGLE;
+ ret = cros_ec_motion_send_host_cmd(st, sizeof(st->resp->lid_angle));
+ if (ret) {
+ dev_warn(&indio_dev->dev, "Unable to read lid angle\n");
+ return ret;
+ }
+
+ *data = st->resp->lid_angle.value;
+ return 0;
+}
+
+static int cros_ec_lid_angle_read(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2, long mask)
+{
+ struct cros_ec_lid_angle_state *st = iio_priv(indio_dev);
+ s16 data;
+ int ret;
+
+ mutex_lock(&st->core.cmd_lock);
+ ret = cros_ec_sensors_read_lid_angle(indio_dev, 1, &data);
+ if (ret == 0) {
+ *val = data;
+ ret = IIO_VAL_INT;
+ }
+ mutex_unlock(&st->core.cmd_lock);
+ return ret;
+}
+
+static const struct iio_info cros_ec_lid_angle_info = {
+ .read_raw = &cros_ec_lid_angle_read,
+};
+
+static int cros_ec_lid_angle_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct iio_dev *indio_dev;
+ struct cros_ec_lid_angle_state *state;
+ int ret;
+
+ indio_dev = devm_iio_device_alloc(dev, sizeof(*state));
+ if (!indio_dev)
+ return -ENOMEM;
+
+ ret = cros_ec_sensors_core_init(pdev, indio_dev, false, NULL);
+ if (ret)
+ return ret;
+
+ indio_dev->info = &cros_ec_lid_angle_info;
+ state = iio_priv(indio_dev);
+ indio_dev->channels = cros_ec_lid_angle_channels;
+ indio_dev->num_channels = ARRAY_SIZE(cros_ec_lid_angle_channels);
+
+ state->core.read_ec_sensors_data = cros_ec_sensors_read_lid_angle;
+
+ ret = devm_iio_triggered_buffer_setup(dev, indio_dev, NULL,
+ cros_ec_sensors_capture, NULL);
+ if (ret)
+ return ret;
+
+ return cros_ec_sensors_core_register(dev, indio_dev, NULL);
+}
+
+static const struct platform_device_id cros_ec_lid_angle_ids[] = {
+ {
+ .name = DRV_NAME,
+ },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(platform, cros_ec_lid_angle_ids);
+
+static struct platform_driver cros_ec_lid_angle_platform_driver = {
+ .driver = {
+ .name = DRV_NAME,
+ },
+ .probe = cros_ec_lid_angle_probe,
+ .id_table = cros_ec_lid_angle_ids,
+};
+module_platform_driver(cros_ec_lid_angle_platform_driver);
+
+MODULE_DESCRIPTION("ChromeOS EC driver for reporting convertible lid angle.");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c
new file mode 100644
index 0000000000..66153b1850
--- /dev/null
+++ b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c
@@ -0,0 +1,329 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * cros_ec_sensors - Driver for Chrome OS Embedded Controller sensors.
+ *
+ * Copyright (C) 2016 Google, Inc
+ *
+ * This driver uses the cros-ec interface to communicate with the Chrome OS
+ * EC about sensors data. Data access is presented through iio sysfs.
+ */
+
+#include <linux/device.h>
+#include <linux/iio/buffer.h>
+#include <linux/iio/common/cros_ec_sensors_core.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/kfifo_buf.h>
+#include <linux/iio/trigger_consumer.h>
+#include <linux/iio/triggered_buffer.h>
+#include <linux/kernel.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/platform_data/cros_ec_commands.h>
+#include <linux/platform_data/cros_ec_proto.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#define CROS_EC_SENSORS_MAX_CHANNELS 4
+
+/* State data for ec_sensors iio driver. */
+struct cros_ec_sensors_state {
+ /* Shared by all sensors */
+ struct cros_ec_sensors_core_state core;
+
+ struct iio_chan_spec channels[CROS_EC_SENSORS_MAX_CHANNELS];
+};
+
+static int cros_ec_sensors_read(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2, long mask)
+{
+ struct cros_ec_sensors_state *st = iio_priv(indio_dev);
+ s16 data = 0;
+ s64 val64;
+ int i;
+ int ret;
+ int idx = chan->scan_index;
+
+ mutex_lock(&st->core.cmd_lock);
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ ret = st->core.read_ec_sensors_data(indio_dev, 1 << idx, &data);
+ if (ret < 0)
+ break;
+ ret = IIO_VAL_INT;
+ *val = data;
+ break;
+ case IIO_CHAN_INFO_CALIBBIAS:
+ st->core.param.cmd = MOTIONSENSE_CMD_SENSOR_OFFSET;
+ st->core.param.sensor_offset.flags = 0;
+
+ ret = cros_ec_motion_send_host_cmd(&st->core, 0);
+ if (ret < 0)
+ break;
+
+ /* Save values */
+ for (i = CROS_EC_SENSOR_X; i < CROS_EC_SENSOR_MAX_AXIS; i++)
+ st->core.calib[i].offset =
+ st->core.resp->sensor_offset.offset[i];
+ ret = IIO_VAL_INT;
+ *val = st->core.calib[idx].offset;
+ break;
+ case IIO_CHAN_INFO_CALIBSCALE:
+ st->core.param.cmd = MOTIONSENSE_CMD_SENSOR_SCALE;
+ st->core.param.sensor_offset.flags = 0;
+
+ ret = cros_ec_motion_send_host_cmd(&st->core, 0);
+ if (ret == -EPROTO || ret == -EOPNOTSUPP) {
+ /* Reading calibscale is not supported on older EC. */
+ *val = 1;
+ *val2 = 0;
+ ret = IIO_VAL_INT_PLUS_MICRO;
+ break;
+ } else if (ret) {
+ break;
+ }
+
+ /* Save values */
+ for (i = CROS_EC_SENSOR_X; i < CROS_EC_SENSOR_MAX_AXIS; i++)
+ st->core.calib[i].scale =
+ st->core.resp->sensor_scale.scale[i];
+
+ *val = st->core.calib[idx].scale >> 15;
+ *val2 = ((st->core.calib[idx].scale & 0x7FFF) * 1000000LL) /
+ MOTION_SENSE_DEFAULT_SCALE;
+ ret = IIO_VAL_INT_PLUS_MICRO;
+ break;
+ case IIO_CHAN_INFO_SCALE:
+ st->core.param.cmd = MOTIONSENSE_CMD_SENSOR_RANGE;
+ st->core.param.sensor_range.data = EC_MOTION_SENSE_NO_VALUE;
+
+ ret = cros_ec_motion_send_host_cmd(&st->core, 0);
+ if (ret < 0)
+ break;
+
+ val64 = st->core.resp->sensor_range.ret;
+ switch (st->core.type) {
+ case MOTIONSENSE_TYPE_ACCEL:
+ /*
+ * EC returns data in g, iio exepects m/s^2.
+ * Do not use IIO_G_TO_M_S_2 to avoid precision loss.
+ */
+ *val = div_s64(val64 * 980665, 10);
+ *val2 = 10000 << (CROS_EC_SENSOR_BITS - 1);
+ ret = IIO_VAL_FRACTIONAL;
+ break;
+ case MOTIONSENSE_TYPE_GYRO:
+ /*
+ * EC returns data in dps, iio expects rad/s.
+ * Do not use IIO_DEGREE_TO_RAD to avoid precision
+ * loss. Round to the nearest integer.
+ */
+ *val = 0;
+ *val2 = div_s64(val64 * 3141592653ULL,
+ 180 << (CROS_EC_SENSOR_BITS - 1));
+ ret = IIO_VAL_INT_PLUS_NANO;
+ break;
+ case MOTIONSENSE_TYPE_MAG:
+ /*
+ * EC returns data in 16LSB / uT,
+ * iio expects Gauss
+ */
+ *val = val64;
+ *val2 = 100 << (CROS_EC_SENSOR_BITS - 1);
+ ret = IIO_VAL_FRACTIONAL;
+ break;
+ default:
+ ret = -EINVAL;
+ }
+ break;
+ default:
+ ret = cros_ec_sensors_core_read(&st->core, chan, val, val2,
+ mask);
+ break;
+ }
+ mutex_unlock(&st->core.cmd_lock);
+
+ return ret;
+}
+
+static int cros_ec_sensors_write(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int val, int val2, long mask)
+{
+ struct cros_ec_sensors_state *st = iio_priv(indio_dev);
+ int i;
+ int ret;
+ int idx = chan->scan_index;
+
+ mutex_lock(&st->core.cmd_lock);
+
+ switch (mask) {
+ case IIO_CHAN_INFO_CALIBBIAS:
+ st->core.calib[idx].offset = val;
+
+ /* Send to EC for each axis, even if not complete */
+ st->core.param.cmd = MOTIONSENSE_CMD_SENSOR_OFFSET;
+ st->core.param.sensor_offset.flags =
+ MOTION_SENSE_SET_OFFSET;
+ for (i = CROS_EC_SENSOR_X; i < CROS_EC_SENSOR_MAX_AXIS; i++)
+ st->core.param.sensor_offset.offset[i] =
+ st->core.calib[i].offset;
+ st->core.param.sensor_offset.temp =
+ EC_MOTION_SENSE_INVALID_CALIB_TEMP;
+
+ ret = cros_ec_motion_send_host_cmd(&st->core, 0);
+ break;
+ case IIO_CHAN_INFO_CALIBSCALE:
+ st->core.calib[idx].scale = val;
+ /* Send to EC for each axis, even if not complete */
+
+ st->core.param.cmd = MOTIONSENSE_CMD_SENSOR_SCALE;
+ st->core.param.sensor_offset.flags =
+ MOTION_SENSE_SET_OFFSET;
+ for (i = CROS_EC_SENSOR_X; i < CROS_EC_SENSOR_MAX_AXIS; i++)
+ st->core.param.sensor_scale.scale[i] =
+ st->core.calib[i].scale;
+ st->core.param.sensor_scale.temp =
+ EC_MOTION_SENSE_INVALID_CALIB_TEMP;
+
+ ret = cros_ec_motion_send_host_cmd(&st->core, 0);
+ break;
+ case IIO_CHAN_INFO_SCALE:
+ if (st->core.type == MOTIONSENSE_TYPE_MAG) {
+ ret = -EINVAL;
+ break;
+ }
+ st->core.param.cmd = MOTIONSENSE_CMD_SENSOR_RANGE;
+ st->core.param.sensor_range.data = val;
+
+ /* Always roundup, so caller gets at least what it asks for. */
+ st->core.param.sensor_range.roundup = 1;
+
+ ret = cros_ec_motion_send_host_cmd(&st->core, 0);
+ if (ret == 0) {
+ st->core.range_updated = true;
+ st->core.curr_range = val;
+ }
+ break;
+ default:
+ ret = cros_ec_sensors_core_write(
+ &st->core, chan, val, val2, mask);
+ break;
+ }
+
+ mutex_unlock(&st->core.cmd_lock);
+
+ return ret;
+}
+
+static const struct iio_info ec_sensors_info = {
+ .read_raw = &cros_ec_sensors_read,
+ .write_raw = &cros_ec_sensors_write,
+ .read_avail = &cros_ec_sensors_core_read_avail,
+};
+
+static int cros_ec_sensors_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct iio_dev *indio_dev;
+ struct cros_ec_sensors_state *state;
+ struct iio_chan_spec *channel;
+ int ret, i;
+
+ indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*state));
+ if (!indio_dev)
+ return -ENOMEM;
+
+ ret = cros_ec_sensors_core_init(pdev, indio_dev, true,
+ cros_ec_sensors_capture);
+ if (ret)
+ return ret;
+
+ indio_dev->info = &ec_sensors_info;
+ state = iio_priv(indio_dev);
+ for (channel = state->channels, i = CROS_EC_SENSOR_X;
+ i < CROS_EC_SENSOR_MAX_AXIS; i++, channel++) {
+ /* Common part */
+ channel->info_mask_separate =
+ BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_CALIBBIAS) |
+ BIT(IIO_CHAN_INFO_CALIBSCALE);
+ channel->info_mask_shared_by_all =
+ BIT(IIO_CHAN_INFO_SCALE) |
+ BIT(IIO_CHAN_INFO_SAMP_FREQ);
+ channel->info_mask_shared_by_all_available =
+ BIT(IIO_CHAN_INFO_SAMP_FREQ);
+ channel->scan_type.realbits = CROS_EC_SENSOR_BITS;
+ channel->scan_type.storagebits = CROS_EC_SENSOR_BITS;
+ channel->scan_index = i;
+ channel->ext_info = cros_ec_sensors_ext_info;
+ channel->modified = 1;
+ channel->channel2 = IIO_MOD_X + i;
+ channel->scan_type.sign = 's';
+
+ /* Sensor specific */
+ switch (state->core.type) {
+ case MOTIONSENSE_TYPE_ACCEL:
+ channel->type = IIO_ACCEL;
+ break;
+ case MOTIONSENSE_TYPE_GYRO:
+ channel->type = IIO_ANGL_VEL;
+ break;
+ case MOTIONSENSE_TYPE_MAG:
+ channel->type = IIO_MAGN;
+ break;
+ default:
+ dev_err(&pdev->dev, "Unknown motion sensor\n");
+ return -EINVAL;
+ }
+ }
+
+ /* Timestamp */
+ channel->type = IIO_TIMESTAMP;
+ channel->channel = -1;
+ channel->scan_index = CROS_EC_SENSOR_MAX_AXIS;
+ channel->scan_type.sign = 's';
+ channel->scan_type.realbits = 64;
+ channel->scan_type.storagebits = 64;
+
+ indio_dev->channels = state->channels;
+ indio_dev->num_channels = CROS_EC_SENSORS_MAX_CHANNELS;
+
+ /* There is only enough room for accel and gyro in the io space */
+ if ((state->core.ec->cmd_readmem != NULL) &&
+ (state->core.type != MOTIONSENSE_TYPE_MAG))
+ state->core.read_ec_sensors_data = cros_ec_sensors_read_lpc;
+ else
+ state->core.read_ec_sensors_data = cros_ec_sensors_read_cmd;
+
+ return cros_ec_sensors_core_register(dev, indio_dev,
+ cros_ec_sensors_push_data);
+}
+
+static const struct platform_device_id cros_ec_sensors_ids[] = {
+ {
+ .name = "cros-ec-accel",
+ },
+ {
+ .name = "cros-ec-gyro",
+ },
+ {
+ .name = "cros-ec-mag",
+ },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(platform, cros_ec_sensors_ids);
+
+static struct platform_driver cros_ec_sensors_platform_driver = {
+ .driver = {
+ .name = "cros-ec-sensors",
+ .pm = &cros_ec_sensors_pm_ops,
+ },
+ .probe = cros_ec_sensors_probe,
+ .id_table = cros_ec_sensors_ids,
+};
+module_platform_driver(cros_ec_sensors_platform_driver);
+
+MODULE_DESCRIPTION("ChromeOS EC 3-axis sensors driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
new file mode 100644
index 0000000000..6bfe5d6847
--- /dev/null
+++ b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
@@ -0,0 +1,870 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * cros_ec_sensors_core - Common function for Chrome OS EC sensor driver.
+ *
+ * Copyright (C) 2016 Google, Inc
+ */
+
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/iio/buffer.h>
+#include <linux/iio/common/cros_ec_sensors_core.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/kfifo_buf.h>
+#include <linux/iio/sysfs.h>
+#include <linux/iio/trigger.h>
+#include <linux/iio/trigger_consumer.h>
+#include <linux/iio/triggered_buffer.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/platform_data/cros_ec_commands.h>
+#include <linux/platform_data/cros_ec_proto.h>
+#include <linux/platform_data/cros_ec_sensorhub.h>
+#include <linux/platform_device.h>
+
+/*
+ * Hard coded to the first device to support sensor fifo. The EC has a 2048
+ * byte fifo and will trigger an interrupt when fifo is 2/3 full.
+ */
+#define CROS_EC_FIFO_SIZE (2048 * 2 / 3)
+
+static int cros_ec_get_host_cmd_version_mask(struct cros_ec_device *ec_dev,
+ u16 cmd_offset, u16 cmd, u32 *mask)
+{
+ int ret;
+ struct {
+ struct cros_ec_command msg;
+ union {
+ struct ec_params_get_cmd_versions params;
+ struct ec_response_get_cmd_versions resp;
+ };
+ } __packed buf = {
+ .msg = {
+ .command = EC_CMD_GET_CMD_VERSIONS + cmd_offset,
+ .insize = sizeof(struct ec_response_get_cmd_versions),
+ .outsize = sizeof(struct ec_params_get_cmd_versions)
+ },
+ .params = {.cmd = cmd}
+ };
+
+ ret = cros_ec_cmd_xfer_status(ec_dev, &buf.msg);
+ if (ret >= 0)
+ *mask = buf.resp.version_mask;
+ return ret;
+}
+
+static void get_default_min_max_freq(enum motionsensor_type type,
+ u32 *min_freq,
+ u32 *max_freq,
+ u32 *max_fifo_events)
+{
+ /*
+ * We don't know fifo size, set to size previously used by older
+ * hardware.
+ */
+ *max_fifo_events = CROS_EC_FIFO_SIZE;
+
+ switch (type) {
+ case MOTIONSENSE_TYPE_ACCEL:
+ *min_freq = 12500;
+ *max_freq = 100000;
+ break;
+ case MOTIONSENSE_TYPE_GYRO:
+ *min_freq = 25000;
+ *max_freq = 100000;
+ break;
+ case MOTIONSENSE_TYPE_MAG:
+ *min_freq = 5000;
+ *max_freq = 25000;
+ break;
+ case MOTIONSENSE_TYPE_PROX:
+ case MOTIONSENSE_TYPE_LIGHT:
+ *min_freq = 100;
+ *max_freq = 50000;
+ break;
+ case MOTIONSENSE_TYPE_BARO:
+ *min_freq = 250;
+ *max_freq = 20000;
+ break;
+ case MOTIONSENSE_TYPE_ACTIVITY:
+ default:
+ *min_freq = 0;
+ *max_freq = 0;
+ break;
+ }
+}
+
+static int cros_ec_sensor_set_ec_rate(struct cros_ec_sensors_core_state *st,
+ int rate)
+{
+ int ret;
+
+ if (rate > U16_MAX)
+ rate = U16_MAX;
+
+ mutex_lock(&st->cmd_lock);
+ st->param.cmd = MOTIONSENSE_CMD_EC_RATE;
+ st->param.ec_rate.data = rate;
+ ret = cros_ec_motion_send_host_cmd(st, 0);
+ mutex_unlock(&st->cmd_lock);
+ return ret;
+}
+
+static ssize_t cros_ec_sensor_set_report_latency(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t len)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct cros_ec_sensors_core_state *st = iio_priv(indio_dev);
+ int integer, fract, ret;
+ int latency;
+
+ ret = iio_str_to_fixpoint(buf, 100000, &integer, &fract);
+ if (ret)
+ return ret;
+
+ /* EC rate is in ms. */
+ latency = integer * 1000 + fract / 1000;
+ ret = cros_ec_sensor_set_ec_rate(st, latency);
+ if (ret < 0)
+ return ret;
+
+ return len;
+}
+
+static ssize_t cros_ec_sensor_get_report_latency(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct cros_ec_sensors_core_state *st = iio_priv(indio_dev);
+ int latency, ret;
+
+ mutex_lock(&st->cmd_lock);
+ st->param.cmd = MOTIONSENSE_CMD_EC_RATE;
+ st->param.ec_rate.data = EC_MOTION_SENSE_NO_VALUE;
+
+ ret = cros_ec_motion_send_host_cmd(st, 0);
+ latency = st->resp->ec_rate.ret;
+ mutex_unlock(&st->cmd_lock);
+ if (ret < 0)
+ return ret;
+
+ return sprintf(buf, "%d.%06u\n",
+ latency / 1000,
+ (latency % 1000) * 1000);
+}
+
+static IIO_DEVICE_ATTR(hwfifo_timeout, 0644,
+ cros_ec_sensor_get_report_latency,
+ cros_ec_sensor_set_report_latency, 0);
+
+static ssize_t hwfifo_watermark_max_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct cros_ec_sensors_core_state *st = iio_priv(indio_dev);
+
+ return sprintf(buf, "%d\n", st->fifo_max_event_count);
+}
+
+static IIO_DEVICE_ATTR_RO(hwfifo_watermark_max, 0);
+
+static const struct iio_dev_attr *cros_ec_sensor_fifo_attributes[] = {
+ &iio_dev_attr_hwfifo_timeout,
+ &iio_dev_attr_hwfifo_watermark_max,
+ NULL,
+};
+
+int cros_ec_sensors_push_data(struct iio_dev *indio_dev,
+ s16 *data,
+ s64 timestamp)
+{
+ struct cros_ec_sensors_core_state *st = iio_priv(indio_dev);
+ s16 *out;
+ s64 delta;
+ unsigned int i;
+
+ /*
+ * Ignore samples if the buffer is not set: it is needed if the ODR is
+ * set but the buffer is not enabled yet.
+ *
+ * Note: iio_device_claim_buffer_mode() returns -EBUSY if the buffer
+ * is not enabled.
+ */
+ if (iio_device_claim_buffer_mode(indio_dev) < 0)
+ return 0;
+
+ out = (s16 *)st->samples;
+ for_each_set_bit(i,
+ indio_dev->active_scan_mask,
+ indio_dev->masklength) {
+ *out = data[i];
+ out++;
+ }
+
+ if (iio_device_get_clock(indio_dev) != CLOCK_BOOTTIME)
+ delta = iio_get_time_ns(indio_dev) - cros_ec_get_time_ns();
+ else
+ delta = 0;
+
+ iio_push_to_buffers_with_timestamp(indio_dev, st->samples,
+ timestamp + delta);
+
+ iio_device_release_buffer_mode(indio_dev);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(cros_ec_sensors_push_data);
+
+static void cros_ec_sensors_core_clean(void *arg)
+{
+ struct platform_device *pdev = (struct platform_device *)arg;
+ struct cros_ec_sensorhub *sensor_hub =
+ dev_get_drvdata(pdev->dev.parent);
+ struct iio_dev *indio_dev = platform_get_drvdata(pdev);
+ struct cros_ec_sensors_core_state *st = iio_priv(indio_dev);
+ u8 sensor_num = st->param.info.sensor_num;
+
+ cros_ec_sensorhub_unregister_push_data(sensor_hub, sensor_num);
+}
+
+/**
+ * cros_ec_sensors_core_init() - basic initialization of the core structure
+ * @pdev: platform device created for the sensor
+ * @indio_dev: iio device structure of the device
+ * @physical_device: true if the device refers to a physical device
+ * @trigger_capture: function pointer to call buffer is triggered,
+ * for backward compatibility.
+ *
+ * Return: 0 on success, -errno on failure.
+ */
+int cros_ec_sensors_core_init(struct platform_device *pdev,
+ struct iio_dev *indio_dev,
+ bool physical_device,
+ cros_ec_sensors_capture_t trigger_capture)
+{
+ struct device *dev = &pdev->dev;
+ struct cros_ec_sensors_core_state *state = iio_priv(indio_dev);
+ struct cros_ec_sensorhub *sensor_hub = dev_get_drvdata(dev->parent);
+ struct cros_ec_dev *ec = sensor_hub->ec;
+ struct cros_ec_sensor_platform *sensor_platform = dev_get_platdata(dev);
+ u32 ver_mask, temp;
+ int frequencies[ARRAY_SIZE(state->frequencies) / 2] = { 0 };
+ int ret, i;
+
+ platform_set_drvdata(pdev, indio_dev);
+
+ state->ec = ec->ec_dev;
+ state->msg = devm_kzalloc(&pdev->dev, sizeof(*state->msg) +
+ max((u16)sizeof(struct ec_params_motion_sense),
+ state->ec->max_response), GFP_KERNEL);
+ if (!state->msg)
+ return -ENOMEM;
+
+ state->resp = (struct ec_response_motion_sense *)state->msg->data;
+
+ mutex_init(&state->cmd_lock);
+
+ ret = cros_ec_get_host_cmd_version_mask(state->ec,
+ ec->cmd_offset,
+ EC_CMD_MOTION_SENSE_CMD,
+ &ver_mask);
+ if (ret < 0)
+ return ret;
+
+ /* Set up the host command structure. */
+ state->msg->version = fls(ver_mask) - 1;
+ state->msg->command = EC_CMD_MOTION_SENSE_CMD + ec->cmd_offset;
+ state->msg->outsize = sizeof(struct ec_params_motion_sense);
+
+ indio_dev->name = pdev->name;
+
+ if (physical_device) {
+ enum motionsensor_location loc;
+
+ state->param.cmd = MOTIONSENSE_CMD_INFO;
+ state->param.info.sensor_num = sensor_platform->sensor_num;
+ ret = cros_ec_motion_send_host_cmd(state, 0);
+ if (ret) {
+ dev_warn(dev, "Can not access sensor info\n");
+ return ret;
+ }
+ state->type = state->resp->info.type;
+ loc = state->resp->info.location;
+ if (loc == MOTIONSENSE_LOC_BASE)
+ indio_dev->label = "accel-base";
+ else if (loc == MOTIONSENSE_LOC_LID)
+ indio_dev->label = "accel-display";
+ else if (loc == MOTIONSENSE_LOC_CAMERA)
+ indio_dev->label = "accel-camera";
+
+ /* Set sign vector, only used for backward compatibility. */
+ memset(state->sign, 1, CROS_EC_SENSOR_MAX_AXIS);
+
+ for (i = CROS_EC_SENSOR_X; i < CROS_EC_SENSOR_MAX_AXIS; i++)
+ state->calib[i].scale = MOTION_SENSE_DEFAULT_SCALE;
+
+ /* 0 is a correct value used to stop the device */
+ if (state->msg->version < 3) {
+ get_default_min_max_freq(state->resp->info.type,
+ &frequencies[1],
+ &frequencies[2],
+ &state->fifo_max_event_count);
+ } else {
+ if (state->resp->info_3.max_frequency == 0) {
+ get_default_min_max_freq(state->resp->info.type,
+ &frequencies[1],
+ &frequencies[2],
+ &temp);
+ } else {
+ frequencies[1] = state->resp->info_3.min_frequency;
+ frequencies[2] = state->resp->info_3.max_frequency;
+ }
+ state->fifo_max_event_count = state->resp->info_3.fifo_max_event_count;
+ }
+ for (i = 0; i < ARRAY_SIZE(frequencies); i++) {
+ state->frequencies[2 * i] = frequencies[i] / 1000;
+ state->frequencies[2 * i + 1] =
+ (frequencies[i] % 1000) * 1000;
+ }
+
+ if (cros_ec_check_features(ec, EC_FEATURE_MOTION_SENSE_FIFO)) {
+ /*
+ * Create a software buffer, feed by the EC FIFO.
+ * We can not use trigger here, as events are generated
+ * as soon as sample_frequency is set.
+ */
+ ret = devm_iio_kfifo_buffer_setup_ext(dev, indio_dev, NULL,
+ cros_ec_sensor_fifo_attributes);
+ if (ret)
+ return ret;
+
+ /* Timestamp coming from FIFO are in ns since boot. */
+ ret = iio_device_set_clock(indio_dev, CLOCK_BOOTTIME);
+ if (ret)
+ return ret;
+
+ } else {
+ /*
+ * The only way to get samples in buffer is to set a
+ * software trigger (systrig, hrtimer).
+ */
+ ret = devm_iio_triggered_buffer_setup(dev, indio_dev,
+ NULL, trigger_capture, NULL);
+ if (ret)
+ return ret;
+ }
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(cros_ec_sensors_core_init);
+
+/**
+ * cros_ec_sensors_core_register() - Register callback to FIFO and IIO when
+ * sensor is ready.
+ * It must be called at the end of the sensor probe routine.
+ * @dev: device created for the sensor
+ * @indio_dev: iio device structure of the device
+ * @push_data: function to call when cros_ec_sensorhub receives
+ * a sample for that sensor.
+ *
+ * Return: 0 on success, -errno on failure.
+ */
+int cros_ec_sensors_core_register(struct device *dev,
+ struct iio_dev *indio_dev,
+ cros_ec_sensorhub_push_data_cb_t push_data)
+{
+ struct cros_ec_sensor_platform *sensor_platform = dev_get_platdata(dev);
+ struct cros_ec_sensorhub *sensor_hub = dev_get_drvdata(dev->parent);
+ struct platform_device *pdev = to_platform_device(dev);
+ struct cros_ec_dev *ec = sensor_hub->ec;
+ int ret;
+
+ ret = devm_iio_device_register(dev, indio_dev);
+ if (ret)
+ return ret;
+
+ if (!push_data ||
+ !cros_ec_check_features(ec, EC_FEATURE_MOTION_SENSE_FIFO))
+ return 0;
+
+ ret = cros_ec_sensorhub_register_push_data(
+ sensor_hub, sensor_platform->sensor_num,
+ indio_dev, push_data);
+ if (ret)
+ return ret;
+
+ return devm_add_action_or_reset(
+ dev, cros_ec_sensors_core_clean, pdev);
+}
+EXPORT_SYMBOL_GPL(cros_ec_sensors_core_register);
+
+/**
+ * cros_ec_motion_send_host_cmd() - send motion sense host command
+ * @state: pointer to state information for device
+ * @opt_length: optional length to reduce the response size, useful on the data
+ * path. Otherwise, the maximal allowed response size is used
+ *
+ * When called, the sub-command is assumed to be set in param->cmd.
+ *
+ * Return: 0 on success, -errno on failure.
+ */
+int cros_ec_motion_send_host_cmd(struct cros_ec_sensors_core_state *state,
+ u16 opt_length)
+{
+ int ret;
+
+ if (opt_length)
+ state->msg->insize = min(opt_length, state->ec->max_response);
+ else
+ state->msg->insize = state->ec->max_response;
+
+ memcpy(state->msg->data, &state->param, sizeof(state->param));
+
+ ret = cros_ec_cmd_xfer_status(state->ec, state->msg);
+ if (ret < 0)
+ return ret;
+
+ if (ret &&
+ state->resp != (struct ec_response_motion_sense *)state->msg->data)
+ memcpy(state->resp, state->msg->data, ret);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(cros_ec_motion_send_host_cmd);
+
+static ssize_t cros_ec_sensors_calibrate(struct iio_dev *indio_dev,
+ uintptr_t private, const struct iio_chan_spec *chan,
+ const char *buf, size_t len)
+{
+ struct cros_ec_sensors_core_state *st = iio_priv(indio_dev);
+ int ret, i;
+ bool calibrate;
+
+ ret = kstrtobool(buf, &calibrate);
+ if (ret < 0)
+ return ret;
+ if (!calibrate)
+ return -EINVAL;
+
+ mutex_lock(&st->cmd_lock);
+ st->param.cmd = MOTIONSENSE_CMD_PERFORM_CALIB;
+ ret = cros_ec_motion_send_host_cmd(st, 0);
+ if (ret != 0) {
+ dev_warn(&indio_dev->dev, "Unable to calibrate sensor\n");
+ } else {
+ /* Save values */
+ for (i = CROS_EC_SENSOR_X; i < CROS_EC_SENSOR_MAX_AXIS; i++)
+ st->calib[i].offset = st->resp->perform_calib.offset[i];
+ }
+ mutex_unlock(&st->cmd_lock);
+
+ return ret ? ret : len;
+}
+
+static ssize_t cros_ec_sensors_id(struct iio_dev *indio_dev,
+ uintptr_t private,
+ const struct iio_chan_spec *chan, char *buf)
+{
+ struct cros_ec_sensors_core_state *st = iio_priv(indio_dev);
+
+ return snprintf(buf, PAGE_SIZE, "%d\n", st->param.info.sensor_num);
+}
+
+const struct iio_chan_spec_ext_info cros_ec_sensors_ext_info[] = {
+ {
+ .name = "calibrate",
+ .shared = IIO_SHARED_BY_ALL,
+ .write = cros_ec_sensors_calibrate
+ },
+ {
+ .name = "id",
+ .shared = IIO_SHARED_BY_ALL,
+ .read = cros_ec_sensors_id
+ },
+ { },
+};
+EXPORT_SYMBOL_GPL(cros_ec_sensors_ext_info);
+
+/**
+ * cros_ec_sensors_idx_to_reg - convert index into offset in shared memory
+ * @st: pointer to state information for device
+ * @idx: sensor index (should be element of enum sensor_index)
+ *
+ * Return: address to read at
+ */
+static unsigned int cros_ec_sensors_idx_to_reg(
+ struct cros_ec_sensors_core_state *st,
+ unsigned int idx)
+{
+ /*
+ * When using LPC interface, only space for 2 Accel and one Gyro.
+ * First halfword of MOTIONSENSE_TYPE_ACCEL is used by angle.
+ */
+ if (st->type == MOTIONSENSE_TYPE_ACCEL)
+ return EC_MEMMAP_ACC_DATA + sizeof(u16) *
+ (1 + idx + st->param.info.sensor_num *
+ CROS_EC_SENSOR_MAX_AXIS);
+
+ return EC_MEMMAP_GYRO_DATA + sizeof(u16) * idx;
+}
+
+static int cros_ec_sensors_cmd_read_u8(struct cros_ec_device *ec,
+ unsigned int offset, u8 *dest)
+{
+ return ec->cmd_readmem(ec, offset, 1, dest);
+}
+
+static int cros_ec_sensors_cmd_read_u16(struct cros_ec_device *ec,
+ unsigned int offset, u16 *dest)
+{
+ __le16 tmp;
+ int ret = ec->cmd_readmem(ec, offset, 2, &tmp);
+
+ if (ret >= 0)
+ *dest = le16_to_cpu(tmp);
+
+ return ret;
+}
+
+/**
+ * cros_ec_sensors_read_until_not_busy() - read until is not busy
+ *
+ * @st: pointer to state information for device
+ *
+ * Read from EC status byte until it reads not busy.
+ * Return: 8-bit status if ok, -errno on failure.
+ */
+static int cros_ec_sensors_read_until_not_busy(
+ struct cros_ec_sensors_core_state *st)
+{
+ struct cros_ec_device *ec = st->ec;
+ u8 status;
+ int ret, attempts = 0;
+
+ ret = cros_ec_sensors_cmd_read_u8(ec, EC_MEMMAP_ACC_STATUS, &status);
+ if (ret < 0)
+ return ret;
+
+ while (status & EC_MEMMAP_ACC_STATUS_BUSY_BIT) {
+ /* Give up after enough attempts, return error. */
+ if (attempts++ >= 50)
+ return -EIO;
+
+ /* Small delay every so often. */
+ if (attempts % 5 == 0)
+ msleep(25);
+
+ ret = cros_ec_sensors_cmd_read_u8(ec, EC_MEMMAP_ACC_STATUS,
+ &status);
+ if (ret < 0)
+ return ret;
+ }
+
+ return status;
+}
+
+/**
+ * cros_ec_sensors_read_data_unsafe() - read acceleration data from EC shared memory
+ * @indio_dev: pointer to IIO device
+ * @scan_mask: bitmap of the sensor indices to scan
+ * @data: location to store data
+ *
+ * This is the unsafe function for reading the EC data. It does not guarantee
+ * that the EC will not modify the data as it is being read in.
+ *
+ * Return: 0 on success, -errno on failure.
+ */
+static int cros_ec_sensors_read_data_unsafe(struct iio_dev *indio_dev,
+ unsigned long scan_mask, s16 *data)
+{
+ struct cros_ec_sensors_core_state *st = iio_priv(indio_dev);
+ struct cros_ec_device *ec = st->ec;
+ unsigned int i;
+ int ret;
+
+ /* Read all sensors enabled in scan_mask. Each value is 2 bytes. */
+ for_each_set_bit(i, &scan_mask, indio_dev->masklength) {
+ ret = cros_ec_sensors_cmd_read_u16(ec,
+ cros_ec_sensors_idx_to_reg(st, i),
+ data);
+ if (ret < 0)
+ return ret;
+
+ *data *= st->sign[i];
+ data++;
+ }
+
+ return 0;
+}
+
+/**
+ * cros_ec_sensors_read_lpc() - read acceleration data from EC shared memory.
+ * @indio_dev: pointer to IIO device.
+ * @scan_mask: bitmap of the sensor indices to scan.
+ * @data: location to store data.
+ *
+ * Note: this is the safe function for reading the EC data. It guarantees
+ * that the data sampled was not modified by the EC while being read.
+ *
+ * Return: 0 on success, -errno on failure.
+ */
+int cros_ec_sensors_read_lpc(struct iio_dev *indio_dev,
+ unsigned long scan_mask, s16 *data)
+{
+ struct cros_ec_sensors_core_state *st = iio_priv(indio_dev);
+ struct cros_ec_device *ec = st->ec;
+ u8 samp_id = 0xff, status = 0;
+ int ret, attempts = 0;
+
+ /*
+ * Continually read all data from EC until the status byte after
+ * all reads reflects that the EC is not busy and the sample id
+ * matches the sample id from before all reads. This guarantees
+ * that data read in was not modified by the EC while reading.
+ */
+ while ((status & (EC_MEMMAP_ACC_STATUS_BUSY_BIT |
+ EC_MEMMAP_ACC_STATUS_SAMPLE_ID_MASK)) != samp_id) {
+ /* If we have tried to read too many times, return error. */
+ if (attempts++ >= 5)
+ return -EIO;
+
+ /* Read status byte until EC is not busy. */
+ ret = cros_ec_sensors_read_until_not_busy(st);
+ if (ret < 0)
+ return ret;
+
+ /*
+ * Store the current sample id so that we can compare to the
+ * sample id after reading the data.
+ */
+ samp_id = ret & EC_MEMMAP_ACC_STATUS_SAMPLE_ID_MASK;
+
+ /* Read all EC data, format it, and store it into data. */
+ ret = cros_ec_sensors_read_data_unsafe(indio_dev, scan_mask,
+ data);
+ if (ret < 0)
+ return ret;
+
+ /* Read status byte. */
+ ret = cros_ec_sensors_cmd_read_u8(ec, EC_MEMMAP_ACC_STATUS,
+ &status);
+ if (ret < 0)
+ return ret;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(cros_ec_sensors_read_lpc);
+
+/**
+ * cros_ec_sensors_read_cmd() - retrieve data using the EC command protocol
+ * @indio_dev: pointer to IIO device
+ * @scan_mask: bitmap of the sensor indices to scan
+ * @data: location to store data
+ *
+ * Return: 0 on success, -errno on failure.
+ */
+int cros_ec_sensors_read_cmd(struct iio_dev *indio_dev,
+ unsigned long scan_mask, s16 *data)
+{
+ struct cros_ec_sensors_core_state *st = iio_priv(indio_dev);
+ int ret;
+ unsigned int i;
+
+ /* Read all sensor data through a command. */
+ st->param.cmd = MOTIONSENSE_CMD_DATA;
+ ret = cros_ec_motion_send_host_cmd(st, sizeof(st->resp->data));
+ if (ret != 0) {
+ dev_warn(&indio_dev->dev, "Unable to read sensor data\n");
+ return ret;
+ }
+
+ for_each_set_bit(i, &scan_mask, indio_dev->masklength) {
+ *data = st->resp->data.data[i];
+ data++;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(cros_ec_sensors_read_cmd);
+
+/**
+ * cros_ec_sensors_capture() - the trigger handler function
+ * @irq: the interrupt number.
+ * @p: a pointer to the poll function.
+ *
+ * On a trigger event occurring, if the pollfunc is attached then this
+ * handler is called as a threaded interrupt (and hence may sleep). It
+ * is responsible for grabbing data from the device and pushing it into
+ * the associated buffer.
+ *
+ * Return: IRQ_HANDLED
+ */
+irqreturn_t cros_ec_sensors_capture(int irq, void *p)
+{
+ struct iio_poll_func *pf = p;
+ struct iio_dev *indio_dev = pf->indio_dev;
+ struct cros_ec_sensors_core_state *st = iio_priv(indio_dev);
+ int ret;
+
+ mutex_lock(&st->cmd_lock);
+
+ /* Clear capture data. */
+ memset(st->samples, 0, indio_dev->scan_bytes);
+
+ /* Read data based on which channels are enabled in scan mask. */
+ ret = st->read_ec_sensors_data(indio_dev,
+ *(indio_dev->active_scan_mask),
+ (s16 *)st->samples);
+ if (ret < 0)
+ goto done;
+
+ iio_push_to_buffers_with_timestamp(indio_dev, st->samples,
+ iio_get_time_ns(indio_dev));
+
+done:
+ /*
+ * Tell the core we are done with this trigger and ready for the
+ * next one.
+ */
+ iio_trigger_notify_done(indio_dev->trig);
+
+ mutex_unlock(&st->cmd_lock);
+
+ return IRQ_HANDLED;
+}
+EXPORT_SYMBOL_GPL(cros_ec_sensors_capture);
+
+/**
+ * cros_ec_sensors_core_read() - function to request a value from the sensor
+ * @st: pointer to state information for device
+ * @chan: channel specification structure table
+ * @val: will contain one element making up the returned value
+ * @val2: will contain another element making up the returned value
+ * @mask: specifies which values to be requested
+ *
+ * Return: the type of value returned by the device
+ */
+int cros_ec_sensors_core_read(struct cros_ec_sensors_core_state *st,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2, long mask)
+{
+ int ret, frequency;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ st->param.cmd = MOTIONSENSE_CMD_SENSOR_ODR;
+ st->param.sensor_odr.data =
+ EC_MOTION_SENSE_NO_VALUE;
+
+ ret = cros_ec_motion_send_host_cmd(st, 0);
+ if (ret)
+ break;
+
+ frequency = st->resp->sensor_odr.ret;
+ *val = frequency / 1000;
+ *val2 = (frequency % 1000) * 1000;
+ ret = IIO_VAL_INT_PLUS_MICRO;
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(cros_ec_sensors_core_read);
+
+/**
+ * cros_ec_sensors_core_read_avail() - get available values
+ * @indio_dev: pointer to state information for device
+ * @chan: channel specification structure table
+ * @vals: list of available values
+ * @type: type of data returned
+ * @length: number of data returned in the array
+ * @mask: specifies which values to be requested
+ *
+ * Return: an error code, IIO_AVAIL_RANGE or IIO_AVAIL_LIST
+ */
+int cros_ec_sensors_core_read_avail(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ const int **vals,
+ int *type,
+ int *length,
+ long mask)
+{
+ struct cros_ec_sensors_core_state *state = iio_priv(indio_dev);
+
+ switch (mask) {
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ *length = ARRAY_SIZE(state->frequencies);
+ *vals = (const int *)&state->frequencies;
+ *type = IIO_VAL_INT_PLUS_MICRO;
+ return IIO_AVAIL_LIST;
+ }
+
+ return -EINVAL;
+}
+EXPORT_SYMBOL_GPL(cros_ec_sensors_core_read_avail);
+
+/**
+ * cros_ec_sensors_core_write() - function to write a value to the sensor
+ * @st: pointer to state information for device
+ * @chan: channel specification structure table
+ * @val: first part of value to write
+ * @val2: second part of value to write
+ * @mask: specifies which values to write
+ *
+ * Return: the type of value returned by the device
+ */
+int cros_ec_sensors_core_write(struct cros_ec_sensors_core_state *st,
+ struct iio_chan_spec const *chan,
+ int val, int val2, long mask)
+{
+ int ret, frequency;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ frequency = val * 1000 + val2 / 1000;
+ st->param.cmd = MOTIONSENSE_CMD_SENSOR_ODR;
+ st->param.sensor_odr.data = frequency;
+
+ /* Always roundup, so caller gets at least what it asks for. */
+ st->param.sensor_odr.roundup = 1;
+
+ ret = cros_ec_motion_send_host_cmd(st, 0);
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+ return ret;
+}
+EXPORT_SYMBOL_GPL(cros_ec_sensors_core_write);
+
+static int __maybe_unused cros_ec_sensors_resume(struct device *dev)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct cros_ec_sensors_core_state *st = iio_priv(indio_dev);
+ int ret = 0;
+
+ if (st->range_updated) {
+ mutex_lock(&st->cmd_lock);
+ st->param.cmd = MOTIONSENSE_CMD_SENSOR_RANGE;
+ st->param.sensor_range.data = st->curr_range;
+ st->param.sensor_range.roundup = 1;
+ ret = cros_ec_motion_send_host_cmd(st, 0);
+ mutex_unlock(&st->cmd_lock);
+ }
+ return ret;
+}
+
+SIMPLE_DEV_PM_OPS(cros_ec_sensors_pm_ops, NULL, cros_ec_sensors_resume);
+EXPORT_SYMBOL_GPL(cros_ec_sensors_pm_ops);
+
+MODULE_DESCRIPTION("ChromeOS EC sensor hub core functions");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/common/hid-sensors/Kconfig b/drivers/iio/common/hid-sensors/Kconfig
new file mode 100644
index 0000000000..2a3dd3b907
--- /dev/null
+++ b/drivers/iio/common/hid-sensors/Kconfig
@@ -0,0 +1,30 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Hid Sensor common modules
+#
+menu "Hid Sensor IIO Common"
+
+config HID_SENSOR_IIO_COMMON
+ tristate "Common modules for all HID Sensor IIO drivers"
+ depends on HID_SENSOR_HUB
+ select HID_SENSOR_IIO_TRIGGER if IIO_BUFFER
+ help
+ Say yes here to build support for HID sensor to use
+ HID sensor common processing for attributes and IIO triggers.
+ There are many attributes which can be shared among multiple
+ HID sensor drivers, this module contains processing for those
+ attributes.
+
+config HID_SENSOR_IIO_TRIGGER
+ tristate "Common module (trigger) for all HID Sensor IIO drivers"
+ depends on HID_SENSOR_HUB && HID_SENSOR_IIO_COMMON && IIO_BUFFER
+ select IIO_TRIGGER
+ select IIO_TRIGGERED_BUFFER
+ help
+ Say yes here to build trigger support for HID sensors.
+ Triggers will be send if all requested attributes were read.
+
+ If this driver is compiled as a module, it will be named
+ hid-sensor-trigger.
+
+endmenu
diff --git a/drivers/iio/common/hid-sensors/Makefile b/drivers/iio/common/hid-sensors/Makefile
new file mode 100644
index 0000000000..64b01a81fc
--- /dev/null
+++ b/drivers/iio/common/hid-sensors/Makefile
@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Makefile for the Hid sensor common modules.
+#
+
+obj-$(CONFIG_HID_SENSOR_IIO_COMMON) += hid-sensor-iio-common.o
+obj-$(CONFIG_HID_SENSOR_IIO_TRIGGER) += hid-sensor-trigger.o
+hid-sensor-iio-common-y := hid-sensor-attributes.o
diff --git a/drivers/iio/common/hid-sensors/hid-sensor-attributes.c b/drivers/iio/common/hid-sensors/hid-sensor-attributes.c
new file mode 100644
index 0000000000..9b279937a2
--- /dev/null
+++ b/drivers/iio/common/hid-sensors/hid-sensor-attributes.c
@@ -0,0 +1,590 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * HID Sensors Driver
+ * Copyright (c) 2012, Intel Corporation.
+ */
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/time.h>
+#include <linux/units.h>
+
+#include <linux/hid-sensor-hub.h>
+#include <linux/iio/iio.h>
+
+static struct {
+ u32 usage_id;
+ int unit; /* 0 for default others from HID sensor spec */
+ int scale_val0; /* scale, whole number */
+ int scale_val1; /* scale, fraction in nanos */
+} unit_conversion[] = {
+ {HID_USAGE_SENSOR_ACCEL_3D, 0, 9, 806650000},
+ {HID_USAGE_SENSOR_ACCEL_3D,
+ HID_USAGE_SENSOR_UNITS_METERS_PER_SEC_SQRD, 1, 0},
+ {HID_USAGE_SENSOR_ACCEL_3D,
+ HID_USAGE_SENSOR_UNITS_G, 9, 806650000},
+
+ {HID_USAGE_SENSOR_GRAVITY_VECTOR, 0, 9, 806650000},
+ {HID_USAGE_SENSOR_GRAVITY_VECTOR,
+ HID_USAGE_SENSOR_UNITS_METERS_PER_SEC_SQRD, 1, 0},
+ {HID_USAGE_SENSOR_GRAVITY_VECTOR,
+ HID_USAGE_SENSOR_UNITS_G, 9, 806650000},
+
+ {HID_USAGE_SENSOR_GYRO_3D, 0, 0, 17453293},
+ {HID_USAGE_SENSOR_GYRO_3D,
+ HID_USAGE_SENSOR_UNITS_RADIANS_PER_SECOND, 1, 0},
+ {HID_USAGE_SENSOR_GYRO_3D,
+ HID_USAGE_SENSOR_UNITS_DEGREES_PER_SECOND, 0, 17453293},
+
+ {HID_USAGE_SENSOR_COMPASS_3D, 0, 0, 1000000},
+ {HID_USAGE_SENSOR_COMPASS_3D, HID_USAGE_SENSOR_UNITS_GAUSS, 1, 0},
+
+ {HID_USAGE_SENSOR_INCLINOMETER_3D, 0, 0, 17453293},
+ {HID_USAGE_SENSOR_INCLINOMETER_3D,
+ HID_USAGE_SENSOR_UNITS_DEGREES, 0, 17453293},
+ {HID_USAGE_SENSOR_INCLINOMETER_3D,
+ HID_USAGE_SENSOR_UNITS_RADIANS, 1, 0},
+
+ {HID_USAGE_SENSOR_ALS, 0, 1, 0},
+ {HID_USAGE_SENSOR_ALS, HID_USAGE_SENSOR_UNITS_LUX, 1, 0},
+
+ {HID_USAGE_SENSOR_PRESSURE, 0, 100, 0},
+ {HID_USAGE_SENSOR_PRESSURE, HID_USAGE_SENSOR_UNITS_PASCAL, 0, 1000000},
+
+ {HID_USAGE_SENSOR_TIME_TIMESTAMP, 0, 1000000000, 0},
+ {HID_USAGE_SENSOR_TIME_TIMESTAMP, HID_USAGE_SENSOR_UNITS_MILLISECOND,
+ 1000000, 0},
+
+ {HID_USAGE_SENSOR_DEVICE_ORIENTATION, 0, 1, 0},
+
+ {HID_USAGE_SENSOR_RELATIVE_ORIENTATION, 0, 1, 0},
+
+ {HID_USAGE_SENSOR_GEOMAGNETIC_ORIENTATION, 0, 1, 0},
+
+ {HID_USAGE_SENSOR_TEMPERATURE, 0, 1000, 0},
+ {HID_USAGE_SENSOR_TEMPERATURE, HID_USAGE_SENSOR_UNITS_DEGREES, 1000, 0},
+
+ {HID_USAGE_SENSOR_HUMIDITY, 0, 1000, 0},
+ {HID_USAGE_SENSOR_HINGE, 0, 0, 17453293},
+ {HID_USAGE_SENSOR_HINGE, HID_USAGE_SENSOR_UNITS_DEGREES, 0, 17453293},
+};
+
+static void simple_div(int dividend, int divisor, int *whole,
+ int *micro_frac)
+{
+ int rem;
+ int exp = 0;
+
+ *micro_frac = 0;
+ if (divisor == 0) {
+ *whole = 0;
+ return;
+ }
+ *whole = dividend/divisor;
+ rem = dividend % divisor;
+ if (rem) {
+ while (rem <= divisor) {
+ rem *= 10;
+ exp++;
+ }
+ *micro_frac = (rem / divisor) * int_pow(10, 6 - exp);
+ }
+}
+
+static void split_micro_fraction(unsigned int no, int exp, int *val1, int *val2)
+{
+ int divisor = int_pow(10, exp);
+
+ *val1 = no / divisor;
+ *val2 = no % divisor * int_pow(10, 6 - exp);
+}
+
+/*
+VTF format uses exponent and variable size format.
+For example if the size is 2 bytes
+0x0067 with VTF16E14 format -> +1.03
+To convert just change to 0x67 to decimal and use two decimal as E14 stands
+for 10^-2.
+Negative numbers are 2's complement
+*/
+static void convert_from_vtf_format(u32 value, int size, int exp,
+ int *val1, int *val2)
+{
+ int sign = 1;
+
+ if (value & BIT(size*8 - 1)) {
+ value = ((1LL << (size * 8)) - value);
+ sign = -1;
+ }
+ exp = hid_sensor_convert_exponent(exp);
+ if (exp >= 0) {
+ *val1 = sign * value * int_pow(10, exp);
+ *val2 = 0;
+ } else {
+ split_micro_fraction(value, -exp, val1, val2);
+ if (*val1)
+ *val1 = sign * (*val1);
+ else
+ *val2 = sign * (*val2);
+ }
+}
+
+static u32 convert_to_vtf_format(int size, int exp, int val1, int val2)
+{
+ int divisor;
+ u32 value;
+ int sign = 1;
+
+ if (val1 < 0 || val2 < 0)
+ sign = -1;
+ exp = hid_sensor_convert_exponent(exp);
+ if (exp < 0) {
+ divisor = int_pow(10, 6 + exp);
+ value = abs(val1) * int_pow(10, -exp);
+ value += abs(val2) / divisor;
+ } else {
+ divisor = int_pow(10, exp);
+ value = abs(val1) / divisor;
+ }
+ if (sign < 0)
+ value = ((1LL << (size * 8)) - value);
+
+ return value;
+}
+
+s32 hid_sensor_read_poll_value(struct hid_sensor_common *st)
+{
+ s32 value = 0;
+ int ret;
+
+ ret = sensor_hub_get_feature(st->hsdev,
+ st->poll.report_id,
+ st->poll.index, sizeof(value), &value);
+
+ if (ret < 0 || value < 0) {
+ return -EINVAL;
+ } else {
+ if (st->poll.units == HID_USAGE_SENSOR_UNITS_SECOND)
+ value = value * 1000;
+ }
+
+ return value;
+}
+EXPORT_SYMBOL_NS(hid_sensor_read_poll_value, IIO_HID_ATTRIBUTES);
+
+int hid_sensor_read_samp_freq_value(struct hid_sensor_common *st,
+ int *val1, int *val2)
+{
+ s32 value;
+ int ret;
+
+ ret = sensor_hub_get_feature(st->hsdev,
+ st->poll.report_id,
+ st->poll.index, sizeof(value), &value);
+ if (ret < 0 || value < 0) {
+ *val1 = *val2 = 0;
+ return -EINVAL;
+ } else {
+ if (st->poll.units == HID_USAGE_SENSOR_UNITS_MILLISECOND)
+ simple_div(1000, value, val1, val2);
+ else if (st->poll.units == HID_USAGE_SENSOR_UNITS_SECOND)
+ simple_div(1, value, val1, val2);
+ else {
+ *val1 = *val2 = 0;
+ return -EINVAL;
+ }
+ }
+
+ return IIO_VAL_INT_PLUS_MICRO;
+}
+EXPORT_SYMBOL_NS(hid_sensor_read_samp_freq_value, IIO_HID);
+
+int hid_sensor_write_samp_freq_value(struct hid_sensor_common *st,
+ int val1, int val2)
+{
+ s32 value;
+ int ret;
+
+ if (val1 < 0 || val2 < 0)
+ return -EINVAL;
+
+ value = val1 * HZ_PER_MHZ + val2;
+ if (value) {
+ if (st->poll.units == HID_USAGE_SENSOR_UNITS_MILLISECOND)
+ value = NSEC_PER_SEC / value;
+ else if (st->poll.units == HID_USAGE_SENSOR_UNITS_SECOND)
+ value = USEC_PER_SEC / value;
+ else
+ value = 0;
+ }
+ ret = sensor_hub_set_feature(st->hsdev, st->poll.report_id,
+ st->poll.index, sizeof(value), &value);
+ if (ret < 0 || value < 0)
+ return -EINVAL;
+
+ ret = sensor_hub_get_feature(st->hsdev,
+ st->poll.report_id,
+ st->poll.index, sizeof(value), &value);
+ if (ret < 0 || value < 0)
+ return -EINVAL;
+
+ st->poll_interval = value;
+
+ return 0;
+}
+EXPORT_SYMBOL_NS(hid_sensor_write_samp_freq_value, IIO_HID);
+
+int hid_sensor_read_raw_hyst_value(struct hid_sensor_common *st,
+ int *val1, int *val2)
+{
+ s32 value;
+ int ret;
+
+ ret = sensor_hub_get_feature(st->hsdev,
+ st->sensitivity.report_id,
+ st->sensitivity.index, sizeof(value),
+ &value);
+ if (ret < 0 || value < 0) {
+ *val1 = *val2 = 0;
+ return -EINVAL;
+ } else {
+ convert_from_vtf_format(value, st->sensitivity.size,
+ st->sensitivity.unit_expo,
+ val1, val2);
+ }
+
+ return IIO_VAL_INT_PLUS_MICRO;
+}
+EXPORT_SYMBOL_NS(hid_sensor_read_raw_hyst_value, IIO_HID);
+
+int hid_sensor_read_raw_hyst_rel_value(struct hid_sensor_common *st, int *val1,
+ int *val2)
+{
+ s32 value;
+ int ret;
+
+ ret = sensor_hub_get_feature(st->hsdev,
+ st->sensitivity_rel.report_id,
+ st->sensitivity_rel.index, sizeof(value),
+ &value);
+ if (ret < 0 || value < 0) {
+ *val1 = *val2 = 0;
+ return -EINVAL;
+ }
+
+ convert_from_vtf_format(value, st->sensitivity_rel.size,
+ st->sensitivity_rel.unit_expo, val1, val2);
+
+ return IIO_VAL_INT_PLUS_MICRO;
+}
+EXPORT_SYMBOL_NS(hid_sensor_read_raw_hyst_rel_value, IIO_HID);
+
+
+int hid_sensor_write_raw_hyst_value(struct hid_sensor_common *st,
+ int val1, int val2)
+{
+ s32 value;
+ int ret;
+
+ if (val1 < 0 || val2 < 0)
+ return -EINVAL;
+
+ value = convert_to_vtf_format(st->sensitivity.size,
+ st->sensitivity.unit_expo,
+ val1, val2);
+ ret = sensor_hub_set_feature(st->hsdev, st->sensitivity.report_id,
+ st->sensitivity.index, sizeof(value),
+ &value);
+ if (ret < 0 || value < 0)
+ return -EINVAL;
+
+ ret = sensor_hub_get_feature(st->hsdev,
+ st->sensitivity.report_id,
+ st->sensitivity.index, sizeof(value),
+ &value);
+ if (ret < 0 || value < 0)
+ return -EINVAL;
+
+ st->raw_hystersis = value;
+
+ return 0;
+}
+EXPORT_SYMBOL_NS(hid_sensor_write_raw_hyst_value, IIO_HID);
+
+int hid_sensor_write_raw_hyst_rel_value(struct hid_sensor_common *st,
+ int val1, int val2)
+{
+ s32 value;
+ int ret;
+
+ if (val1 < 0 || val2 < 0)
+ return -EINVAL;
+
+ value = convert_to_vtf_format(st->sensitivity_rel.size,
+ st->sensitivity_rel.unit_expo,
+ val1, val2);
+ ret = sensor_hub_set_feature(st->hsdev, st->sensitivity_rel.report_id,
+ st->sensitivity_rel.index, sizeof(value),
+ &value);
+ if (ret < 0 || value < 0)
+ return -EINVAL;
+
+ ret = sensor_hub_get_feature(st->hsdev,
+ st->sensitivity_rel.report_id,
+ st->sensitivity_rel.index, sizeof(value),
+ &value);
+ if (ret < 0 || value < 0)
+ return -EINVAL;
+
+ st->raw_hystersis = value;
+
+ return 0;
+}
+EXPORT_SYMBOL_NS(hid_sensor_write_raw_hyst_rel_value, IIO_HID);
+
+/*
+ * This fuction applies the unit exponent to the scale.
+ * For example:
+ * 9.806650000 ->exp:2-> val0[980]val1[665000000]
+ * 9.000806000 ->exp:2-> val0[900]val1[80600000]
+ * 0.174535293 ->exp:2-> val0[17]val1[453529300]
+ * 1.001745329 ->exp:0-> val0[1]val1[1745329]
+ * 1.001745329 ->exp:2-> val0[100]val1[174532900]
+ * 1.001745329 ->exp:4-> val0[10017]val1[453290000]
+ * 9.806650000 ->exp:-2-> val0[0]val1[98066500]
+ */
+static void adjust_exponent_nano(int *val0, int *val1, int scale0,
+ int scale1, int exp)
+{
+ int divisor;
+ int i;
+ int x;
+ int res;
+ int rem;
+
+ if (exp > 0) {
+ *val0 = scale0 * int_pow(10, exp);
+ res = 0;
+ if (exp > 9) {
+ *val1 = 0;
+ return;
+ }
+ for (i = 0; i < exp; ++i) {
+ divisor = int_pow(10, 8 - i);
+ x = scale1 / divisor;
+ res += int_pow(10, exp - 1 - i) * x;
+ scale1 = scale1 % divisor;
+ }
+ *val0 += res;
+ *val1 = scale1 * int_pow(10, exp);
+ } else if (exp < 0) {
+ exp = abs(exp);
+ if (exp > 9) {
+ *val0 = *val1 = 0;
+ return;
+ }
+ divisor = int_pow(10, exp);
+ *val0 = scale0 / divisor;
+ rem = scale0 % divisor;
+ res = 0;
+ for (i = 0; i < (9 - exp); ++i) {
+ divisor = int_pow(10, 8 - i);
+ x = scale1 / divisor;
+ res += int_pow(10, 8 - exp - i) * x;
+ scale1 = scale1 % divisor;
+ }
+ *val1 = rem * int_pow(10, 9 - exp) + res;
+ } else {
+ *val0 = scale0;
+ *val1 = scale1;
+ }
+}
+
+int hid_sensor_format_scale(u32 usage_id,
+ struct hid_sensor_hub_attribute_info *attr_info,
+ int *val0, int *val1)
+{
+ int i;
+ int exp;
+
+ *val0 = 1;
+ *val1 = 0;
+
+ for (i = 0; i < ARRAY_SIZE(unit_conversion); ++i) {
+ if (unit_conversion[i].usage_id == usage_id &&
+ unit_conversion[i].unit == attr_info->units) {
+ exp = hid_sensor_convert_exponent(
+ attr_info->unit_expo);
+ adjust_exponent_nano(val0, val1,
+ unit_conversion[i].scale_val0,
+ unit_conversion[i].scale_val1, exp);
+ break;
+ }
+ }
+
+ return IIO_VAL_INT_PLUS_NANO;
+}
+EXPORT_SYMBOL_NS(hid_sensor_format_scale, IIO_HID);
+
+int64_t hid_sensor_convert_timestamp(struct hid_sensor_common *st,
+ int64_t raw_value)
+{
+ return st->timestamp_ns_scale * raw_value;
+}
+EXPORT_SYMBOL_NS(hid_sensor_convert_timestamp, IIO_HID);
+
+static
+int hid_sensor_get_reporting_interval(struct hid_sensor_hub_device *hsdev,
+ u32 usage_id,
+ struct hid_sensor_common *st)
+{
+ sensor_hub_input_get_attribute_info(hsdev,
+ HID_FEATURE_REPORT, usage_id,
+ HID_USAGE_SENSOR_PROP_REPORT_INTERVAL,
+ &st->poll);
+ /* Default unit of measure is milliseconds */
+ if (st->poll.units == 0)
+ st->poll.units = HID_USAGE_SENSOR_UNITS_MILLISECOND;
+
+ st->poll_interval = -1;
+
+ return 0;
+
+}
+
+static void hid_sensor_get_report_latency_info(struct hid_sensor_hub_device *hsdev,
+ u32 usage_id,
+ struct hid_sensor_common *st)
+{
+ sensor_hub_input_get_attribute_info(hsdev, HID_FEATURE_REPORT,
+ usage_id,
+ HID_USAGE_SENSOR_PROP_REPORT_LATENCY,
+ &st->report_latency);
+
+ hid_dbg(hsdev->hdev, "Report latency attributes: %x:%x\n",
+ st->report_latency.index, st->report_latency.report_id);
+}
+
+int hid_sensor_get_report_latency(struct hid_sensor_common *st)
+{
+ int ret;
+ int value;
+
+ ret = sensor_hub_get_feature(st->hsdev, st->report_latency.report_id,
+ st->report_latency.index, sizeof(value),
+ &value);
+ if (ret < 0)
+ return ret;
+
+ return value;
+}
+EXPORT_SYMBOL_NS(hid_sensor_get_report_latency, IIO_HID_ATTRIBUTES);
+
+int hid_sensor_set_report_latency(struct hid_sensor_common *st, int latency_ms)
+{
+ return sensor_hub_set_feature(st->hsdev, st->report_latency.report_id,
+ st->report_latency.index,
+ sizeof(latency_ms), &latency_ms);
+}
+EXPORT_SYMBOL_NS(hid_sensor_set_report_latency, IIO_HID_ATTRIBUTES);
+
+bool hid_sensor_batch_mode_supported(struct hid_sensor_common *st)
+{
+ return st->report_latency.index > 0 && st->report_latency.report_id > 0;
+}
+EXPORT_SYMBOL_NS(hid_sensor_batch_mode_supported, IIO_HID_ATTRIBUTES);
+
+int hid_sensor_parse_common_attributes(struct hid_sensor_hub_device *hsdev,
+ u32 usage_id,
+ struct hid_sensor_common *st,
+ const u32 *sensitivity_addresses,
+ u32 sensitivity_addresses_len)
+{
+
+ struct hid_sensor_hub_attribute_info timestamp;
+ s32 value;
+ int ret;
+ int i;
+
+ hid_sensor_get_reporting_interval(hsdev, usage_id, st);
+
+ sensor_hub_input_get_attribute_info(hsdev,
+ HID_FEATURE_REPORT, usage_id,
+ HID_USAGE_SENSOR_PROP_REPORT_STATE,
+ &st->report_state);
+
+ sensor_hub_input_get_attribute_info(hsdev,
+ HID_FEATURE_REPORT, usage_id,
+ HID_USAGE_SENSOR_PROY_POWER_STATE,
+ &st->power_state);
+
+ st->power_state.logical_minimum = 1;
+ st->report_state.logical_minimum = 1;
+
+ sensor_hub_input_get_attribute_info(hsdev,
+ HID_FEATURE_REPORT, usage_id,
+ HID_USAGE_SENSOR_PROP_SENSITIVITY_ABS,
+ &st->sensitivity);
+
+ sensor_hub_input_get_attribute_info(hsdev,
+ HID_FEATURE_REPORT, usage_id,
+ HID_USAGE_SENSOR_PROP_SENSITIVITY_REL_PCT,
+ &st->sensitivity_rel);
+ /*
+ * Set Sensitivity field ids, when there is no individual modifier, will
+ * check absolute sensitivity and relative sensitivity of data field
+ */
+ for (i = 0; i < sensitivity_addresses_len; i++) {
+ if (st->sensitivity.index < 0)
+ sensor_hub_input_get_attribute_info(
+ hsdev, HID_FEATURE_REPORT, usage_id,
+ HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS |
+ sensitivity_addresses[i],
+ &st->sensitivity);
+
+ if (st->sensitivity_rel.index < 0)
+ sensor_hub_input_get_attribute_info(
+ hsdev, HID_FEATURE_REPORT, usage_id,
+ HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_REL_PCT |
+ sensitivity_addresses[i],
+ &st->sensitivity_rel);
+ }
+
+ st->raw_hystersis = -1;
+
+ sensor_hub_input_get_attribute_info(hsdev,
+ HID_INPUT_REPORT, usage_id,
+ HID_USAGE_SENSOR_TIME_TIMESTAMP,
+ &timestamp);
+ if (timestamp.index >= 0 && timestamp.report_id) {
+ int val0, val1;
+
+ hid_sensor_format_scale(HID_USAGE_SENSOR_TIME_TIMESTAMP,
+ &timestamp, &val0, &val1);
+ st->timestamp_ns_scale = val0;
+ } else
+ st->timestamp_ns_scale = 1000000000;
+
+ hid_sensor_get_report_latency_info(hsdev, usage_id, st);
+
+ hid_dbg(hsdev->hdev, "common attributes: %x:%x, %x:%x, %x:%x %x:%x %x:%x\n",
+ st->poll.index, st->poll.report_id,
+ st->report_state.index, st->report_state.report_id,
+ st->power_state.index, st->power_state.report_id,
+ st->sensitivity.index, st->sensitivity.report_id,
+ timestamp.index, timestamp.report_id);
+
+ ret = sensor_hub_get_feature(hsdev,
+ st->power_state.report_id,
+ st->power_state.index, sizeof(value), &value);
+ if (ret < 0)
+ return ret;
+ if (value < 0)
+ return -EINVAL;
+
+ return 0;
+}
+EXPORT_SYMBOL_NS(hid_sensor_parse_common_attributes, IIO_HID);
+
+MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
+MODULE_DESCRIPTION("HID Sensor common attribute processing");
+MODULE_LICENSE("GPL");
diff --git a/drivers/iio/common/hid-sensors/hid-sensor-trigger.c b/drivers/iio/common/hid-sensors/hid-sensor-trigger.c
new file mode 100644
index 0000000000..ad8910e6ad
--- /dev/null
+++ b/drivers/iio/common/hid-sensors/hid-sensor-trigger.c
@@ -0,0 +1,327 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * HID Sensors Driver
+ * Copyright (c) 2012, Intel Corporation.
+ */
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/hid-sensor-hub.h>
+#include <linux/workqueue.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/trigger.h>
+#include <linux/iio/triggered_buffer.h>
+#include <linux/iio/trigger_consumer.h>
+#include <linux/iio/sysfs.h>
+#include "hid-sensor-trigger.h"
+
+static ssize_t _hid_sensor_set_report_latency(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t len)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);
+ int integer, fract, ret;
+ int latency;
+
+ ret = iio_str_to_fixpoint(buf, 100000, &integer, &fract);
+ if (ret)
+ return ret;
+
+ latency = integer * 1000 + fract / 1000;
+ ret = hid_sensor_set_report_latency(attrb, latency);
+ if (ret < 0)
+ return len;
+
+ attrb->latency_ms = hid_sensor_get_report_latency(attrb);
+
+ return len;
+}
+
+static ssize_t _hid_sensor_get_report_latency(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);
+ int latency;
+
+ latency = hid_sensor_get_report_latency(attrb);
+ if (latency < 0)
+ return latency;
+
+ return sprintf(buf, "%d.%06u\n", latency / 1000, (latency % 1000) * 1000);
+}
+
+static ssize_t _hid_sensor_get_fifo_state(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);
+ int latency;
+
+ latency = hid_sensor_get_report_latency(attrb);
+ if (latency < 0)
+ return latency;
+
+ return sprintf(buf, "%d\n", !!latency);
+}
+
+static IIO_DEVICE_ATTR(hwfifo_timeout, 0644,
+ _hid_sensor_get_report_latency,
+ _hid_sensor_set_report_latency, 0);
+static IIO_DEVICE_ATTR(hwfifo_enabled, 0444,
+ _hid_sensor_get_fifo_state, NULL, 0);
+
+static const struct iio_dev_attr *hid_sensor_fifo_attributes[] = {
+ &iio_dev_attr_hwfifo_timeout,
+ &iio_dev_attr_hwfifo_enabled,
+ NULL,
+};
+
+static int _hid_sensor_power_state(struct hid_sensor_common *st, bool state)
+{
+ int state_val;
+ int report_val;
+ s32 poll_value = 0;
+
+ if (state) {
+ if (sensor_hub_device_open(st->hsdev))
+ return -EIO;
+
+ atomic_inc(&st->data_ready);
+
+ state_val = hid_sensor_get_usage_index(st->hsdev,
+ st->power_state.report_id,
+ st->power_state.index,
+ HID_USAGE_SENSOR_PROP_POWER_STATE_D0_FULL_POWER_ENUM);
+ report_val = hid_sensor_get_usage_index(st->hsdev,
+ st->report_state.report_id,
+ st->report_state.index,
+ HID_USAGE_SENSOR_PROP_REPORTING_STATE_ALL_EVENTS_ENUM);
+
+ poll_value = hid_sensor_read_poll_value(st);
+ } else {
+ int val;
+
+ val = atomic_dec_if_positive(&st->data_ready);
+ if (val < 0)
+ return 0;
+
+ sensor_hub_device_close(st->hsdev);
+ state_val = hid_sensor_get_usage_index(st->hsdev,
+ st->power_state.report_id,
+ st->power_state.index,
+ HID_USAGE_SENSOR_PROP_POWER_STATE_D4_POWER_OFF_ENUM);
+ report_val = hid_sensor_get_usage_index(st->hsdev,
+ st->report_state.report_id,
+ st->report_state.index,
+ HID_USAGE_SENSOR_PROP_REPORTING_STATE_NO_EVENTS_ENUM);
+ }
+
+ if (state_val >= 0) {
+ state_val += st->power_state.logical_minimum;
+ sensor_hub_set_feature(st->hsdev, st->power_state.report_id,
+ st->power_state.index, sizeof(state_val),
+ &state_val);
+ }
+
+ if (report_val >= 0) {
+ report_val += st->report_state.logical_minimum;
+ sensor_hub_set_feature(st->hsdev, st->report_state.report_id,
+ st->report_state.index,
+ sizeof(report_val),
+ &report_val);
+ }
+
+ pr_debug("HID_SENSOR %s set power_state %d report_state %d\n",
+ st->pdev->name, state_val, report_val);
+
+ sensor_hub_get_feature(st->hsdev, st->power_state.report_id,
+ st->power_state.index,
+ sizeof(state_val), &state_val);
+ if (state && poll_value)
+ msleep_interruptible(poll_value * 2);
+
+ return 0;
+}
+EXPORT_SYMBOL_NS(hid_sensor_power_state, IIO_HID);
+
+int hid_sensor_power_state(struct hid_sensor_common *st, bool state)
+{
+
+#ifdef CONFIG_PM
+ int ret;
+
+ if (atomic_add_unless(&st->runtime_pm_enable, 1, 1))
+ pm_runtime_enable(&st->pdev->dev);
+
+ if (state) {
+ atomic_inc(&st->user_requested_state);
+ ret = pm_runtime_resume_and_get(&st->pdev->dev);
+ } else {
+ atomic_dec(&st->user_requested_state);
+ pm_runtime_mark_last_busy(&st->pdev->dev);
+ pm_runtime_use_autosuspend(&st->pdev->dev);
+ ret = pm_runtime_put_autosuspend(&st->pdev->dev);
+ }
+ if (ret < 0)
+ return ret;
+
+ return 0;
+#else
+ atomic_set(&st->user_requested_state, state);
+ return _hid_sensor_power_state(st, state);
+#endif
+}
+
+static void hid_sensor_set_power_work(struct work_struct *work)
+{
+ struct hid_sensor_common *attrb = container_of(work,
+ struct hid_sensor_common,
+ work);
+
+ if (attrb->poll_interval >= 0)
+ sensor_hub_set_feature(attrb->hsdev, attrb->poll.report_id,
+ attrb->poll.index,
+ sizeof(attrb->poll_interval),
+ &attrb->poll_interval);
+
+ if (attrb->raw_hystersis >= 0)
+ sensor_hub_set_feature(attrb->hsdev,
+ attrb->sensitivity.report_id,
+ attrb->sensitivity.index,
+ sizeof(attrb->raw_hystersis),
+ &attrb->raw_hystersis);
+
+ if (attrb->latency_ms > 0)
+ hid_sensor_set_report_latency(attrb, attrb->latency_ms);
+
+ if (atomic_read(&attrb->user_requested_state))
+ _hid_sensor_power_state(attrb, true);
+}
+
+static int hid_sensor_data_rdy_trigger_set_state(struct iio_trigger *trig,
+ bool state)
+{
+ return hid_sensor_power_state(iio_trigger_get_drvdata(trig), state);
+}
+
+void hid_sensor_remove_trigger(struct iio_dev *indio_dev,
+ struct hid_sensor_common *attrb)
+{
+ if (atomic_read(&attrb->runtime_pm_enable))
+ pm_runtime_disable(&attrb->pdev->dev);
+
+ pm_runtime_set_suspended(&attrb->pdev->dev);
+
+ cancel_work_sync(&attrb->work);
+ iio_trigger_unregister(attrb->trigger);
+ iio_trigger_free(attrb->trigger);
+ iio_triggered_buffer_cleanup(indio_dev);
+}
+EXPORT_SYMBOL_NS(hid_sensor_remove_trigger, IIO_HID);
+
+static const struct iio_trigger_ops hid_sensor_trigger_ops = {
+ .set_trigger_state = &hid_sensor_data_rdy_trigger_set_state,
+};
+
+int hid_sensor_setup_trigger(struct iio_dev *indio_dev, const char *name,
+ struct hid_sensor_common *attrb)
+{
+ const struct iio_dev_attr **fifo_attrs;
+ int ret;
+ struct iio_trigger *trig;
+
+ if (hid_sensor_batch_mode_supported(attrb))
+ fifo_attrs = hid_sensor_fifo_attributes;
+ else
+ fifo_attrs = NULL;
+
+ ret = iio_triggered_buffer_setup_ext(indio_dev,
+ &iio_pollfunc_store_time, NULL,
+ IIO_BUFFER_DIRECTION_IN,
+ NULL, fifo_attrs);
+ if (ret) {
+ dev_err(&indio_dev->dev, "Triggered Buffer Setup Failed\n");
+ return ret;
+ }
+
+ trig = iio_trigger_alloc(indio_dev->dev.parent,
+ "%s-dev%d", name, iio_device_id(indio_dev));
+ if (trig == NULL) {
+ dev_err(&indio_dev->dev, "Trigger Allocate Failed\n");
+ ret = -ENOMEM;
+ goto error_triggered_buffer_cleanup;
+ }
+
+ iio_trigger_set_drvdata(trig, attrb);
+ trig->ops = &hid_sensor_trigger_ops;
+ ret = iio_trigger_register(trig);
+
+ if (ret) {
+ dev_err(&indio_dev->dev, "Trigger Register Failed\n");
+ goto error_free_trig;
+ }
+ attrb->trigger = trig;
+ indio_dev->trig = iio_trigger_get(trig);
+
+ ret = pm_runtime_set_active(&indio_dev->dev);
+ if (ret)
+ goto error_unreg_trigger;
+
+ iio_device_set_drvdata(indio_dev, attrb);
+
+ INIT_WORK(&attrb->work, hid_sensor_set_power_work);
+
+ pm_suspend_ignore_children(&attrb->pdev->dev, true);
+ /* Default to 3 seconds, but can be changed from sysfs */
+ pm_runtime_set_autosuspend_delay(&attrb->pdev->dev,
+ 3000);
+ return ret;
+error_unreg_trigger:
+ iio_trigger_unregister(trig);
+error_free_trig:
+ iio_trigger_free(trig);
+error_triggered_buffer_cleanup:
+ iio_triggered_buffer_cleanup(indio_dev);
+ return ret;
+}
+EXPORT_SYMBOL_NS(hid_sensor_setup_trigger, IIO_HID);
+
+static int __maybe_unused hid_sensor_suspend(struct device *dev)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);
+
+ return _hid_sensor_power_state(attrb, false);
+}
+
+static int __maybe_unused hid_sensor_resume(struct device *dev)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);
+ schedule_work(&attrb->work);
+ return 0;
+}
+
+static int __maybe_unused hid_sensor_runtime_resume(struct device *dev)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);
+ return _hid_sensor_power_state(attrb, true);
+}
+
+const struct dev_pm_ops hid_sensor_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(hid_sensor_suspend, hid_sensor_resume)
+ SET_RUNTIME_PM_OPS(hid_sensor_suspend,
+ hid_sensor_runtime_resume, NULL)
+};
+EXPORT_SYMBOL_NS(hid_sensor_pm_ops, IIO_HID);
+
+MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
+MODULE_DESCRIPTION("HID Sensor trigger processing");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS(IIO_HID_ATTRIBUTES);
diff --git a/drivers/iio/common/hid-sensors/hid-sensor-trigger.h b/drivers/iio/common/hid-sensors/hid-sensor-trigger.h
new file mode 100644
index 0000000000..f94fca4f1e
--- /dev/null
+++ b/drivers/iio/common/hid-sensors/hid-sensor-trigger.h
@@ -0,0 +1,23 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * HID Sensors Driver
+ * Copyright (c) 2012, Intel Corporation.
+ */
+#ifndef _HID_SENSOR_TRIGGER_H
+#define _HID_SENSOR_TRIGGER_H
+
+#include <linux/pm.h>
+#include <linux/pm_runtime.h>
+
+struct hid_sensor_common;
+struct iio_dev;
+
+extern const struct dev_pm_ops hid_sensor_pm_ops;
+
+int hid_sensor_setup_trigger(struct iio_dev *indio_dev, const char *name,
+ struct hid_sensor_common *attrb);
+void hid_sensor_remove_trigger(struct iio_dev *indio_dev,
+ struct hid_sensor_common *attrb);
+int hid_sensor_power_state(struct hid_sensor_common *st, bool state);
+
+#endif
diff --git a/drivers/iio/common/inv_sensors/Kconfig b/drivers/iio/common/inv_sensors/Kconfig
new file mode 100644
index 0000000000..28815fb431
--- /dev/null
+++ b/drivers/iio/common/inv_sensors/Kconfig
@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# TDK-InvenSense sensors common library
+#
+
+config IIO_INV_SENSORS_TIMESTAMP
+ tristate
diff --git a/drivers/iio/common/inv_sensors/Makefile b/drivers/iio/common/inv_sensors/Makefile
new file mode 100644
index 0000000000..dcf39f2491
--- /dev/null
+++ b/drivers/iio/common/inv_sensors/Makefile
@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for TDK-InvenSense sensors module.
+#
+
+obj-$(CONFIG_IIO_INV_SENSORS_TIMESTAMP) += inv_sensors_timestamp.o
diff --git a/drivers/iio/common/inv_sensors/inv_sensors_timestamp.c b/drivers/iio/common/inv_sensors/inv_sensors_timestamp.c
new file mode 100644
index 0000000000..03823ee57f
--- /dev/null
+++ b/drivers/iio/common/inv_sensors/inv_sensors_timestamp.c
@@ -0,0 +1,194 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2020 Invensense, Inc.
+ */
+
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/math64.h>
+#include <linux/module.h>
+
+#include <linux/iio/common/inv_sensors_timestamp.h>
+
+/* compute jitter, min and max following jitter in per mille */
+#define INV_SENSORS_TIMESTAMP_JITTER(_val, _jitter) \
+ (div_s64((_val) * (_jitter), 1000))
+#define INV_SENSORS_TIMESTAMP_MIN(_val, _jitter) \
+ (((_val) * (1000 - (_jitter))) / 1000)
+#define INV_SENSORS_TIMESTAMP_MAX(_val, _jitter) \
+ (((_val) * (1000 + (_jitter))) / 1000)
+
+/* Add a new value inside an accumulator and update the estimate value */
+static void inv_update_acc(struct inv_sensors_timestamp_acc *acc, uint32_t val)
+{
+ uint64_t sum = 0;
+ size_t i;
+
+ acc->values[acc->idx++] = val;
+ if (acc->idx >= ARRAY_SIZE(acc->values))
+ acc->idx = 0;
+
+ /* compute the mean of all stored values, use 0 as empty slot */
+ for (i = 0; i < ARRAY_SIZE(acc->values); ++i) {
+ if (acc->values[i] == 0)
+ break;
+ sum += acc->values[i];
+ }
+
+ acc->val = div_u64(sum, i);
+}
+
+void inv_sensors_timestamp_init(struct inv_sensors_timestamp *ts,
+ const struct inv_sensors_timestamp_chip *chip)
+{
+ memset(ts, 0, sizeof(*ts));
+
+ /* save chip parameters and compute min and max clock period */
+ ts->chip = *chip;
+ ts->min_period = INV_SENSORS_TIMESTAMP_MIN(chip->clock_period, chip->jitter);
+ ts->max_period = INV_SENSORS_TIMESTAMP_MAX(chip->clock_period, chip->jitter);
+
+ /* current multiplier and period values after reset */
+ ts->mult = chip->init_period / chip->clock_period;
+ ts->period = chip->init_period;
+
+ /* use theoretical value for chip period */
+ inv_update_acc(&ts->chip_period, chip->clock_period);
+}
+EXPORT_SYMBOL_NS_GPL(inv_sensors_timestamp_init, IIO_INV_SENSORS_TIMESTAMP);
+
+int inv_sensors_timestamp_update_odr(struct inv_sensors_timestamp *ts,
+ uint32_t period, bool fifo)
+{
+ /* when FIFO is on, prevent odr change if one is already pending */
+ if (fifo && ts->new_mult != 0)
+ return -EAGAIN;
+
+ ts->new_mult = period / ts->chip.clock_period;
+
+ return 0;
+}
+EXPORT_SYMBOL_NS_GPL(inv_sensors_timestamp_update_odr, IIO_INV_SENSORS_TIMESTAMP);
+
+static bool inv_validate_period(struct inv_sensors_timestamp *ts, uint32_t period, uint32_t mult)
+{
+ uint32_t period_min, period_max;
+
+ /* check that period is acceptable */
+ period_min = ts->min_period * mult;
+ period_max = ts->max_period * mult;
+ if (period > period_min && period < period_max)
+ return true;
+ else
+ return false;
+}
+
+static bool inv_update_chip_period(struct inv_sensors_timestamp *ts,
+ uint32_t mult, uint32_t period)
+{
+ uint32_t new_chip_period;
+
+ if (!inv_validate_period(ts, period, mult))
+ return false;
+
+ /* update chip internal period estimation */
+ new_chip_period = period / mult;
+ inv_update_acc(&ts->chip_period, new_chip_period);
+ ts->period = ts->mult * ts->chip_period.val;
+
+ return true;
+}
+
+static void inv_align_timestamp_it(struct inv_sensors_timestamp *ts)
+{
+ int64_t delta, jitter;
+ int64_t adjust;
+
+ /* delta time between last sample and last interrupt */
+ delta = ts->it.lo - ts->timestamp;
+
+ /* adjust timestamp while respecting jitter */
+ jitter = INV_SENSORS_TIMESTAMP_JITTER((int64_t)ts->period, ts->chip.jitter);
+ if (delta > jitter)
+ adjust = jitter;
+ else if (delta < -jitter)
+ adjust = -jitter;
+ else
+ adjust = 0;
+
+ ts->timestamp += adjust;
+}
+
+void inv_sensors_timestamp_interrupt(struct inv_sensors_timestamp *ts,
+ uint32_t fifo_period, size_t fifo_nb,
+ size_t sensor_nb, int64_t timestamp)
+{
+ struct inv_sensors_timestamp_interval *it;
+ int64_t delta, interval;
+ const uint32_t fifo_mult = fifo_period / ts->chip.clock_period;
+ uint32_t period = ts->period;
+ bool valid = false;
+
+ if (fifo_nb == 0)
+ return;
+
+ /* update interrupt timestamp and compute chip and sensor periods */
+ it = &ts->it;
+ it->lo = it->up;
+ it->up = timestamp;
+ delta = it->up - it->lo;
+ if (it->lo != 0) {
+ /* compute period: delta time divided by number of samples */
+ period = div_s64(delta, fifo_nb);
+ valid = inv_update_chip_period(ts, fifo_mult, period);
+ }
+
+ /* no previous data, compute theoritical value from interrupt */
+ if (ts->timestamp == 0) {
+ /* elapsed time: sensor period * sensor samples number */
+ interval = (int64_t)ts->period * (int64_t)sensor_nb;
+ ts->timestamp = it->up - interval;
+ return;
+ }
+
+ /* if interrupt interval is valid, sync with interrupt timestamp */
+ if (valid)
+ inv_align_timestamp_it(ts);
+}
+EXPORT_SYMBOL_NS_GPL(inv_sensors_timestamp_interrupt, IIO_INV_SENSORS_TIMESTAMP);
+
+void inv_sensors_timestamp_apply_odr(struct inv_sensors_timestamp *ts,
+ uint32_t fifo_period, size_t fifo_nb,
+ unsigned int fifo_no)
+{
+ int64_t interval;
+ uint32_t fifo_mult;
+
+ if (ts->new_mult == 0)
+ return;
+
+ /* update to new multiplier and update period */
+ ts->mult = ts->new_mult;
+ ts->new_mult = 0;
+ ts->period = ts->mult * ts->chip_period.val;
+
+ /*
+ * After ODR change the time interval with the previous sample is
+ * undertermined (depends when the change occures). So we compute the
+ * timestamp from the current interrupt using the new FIFO period, the
+ * total number of samples and the current sample numero.
+ */
+ if (ts->timestamp != 0) {
+ /* compute measured fifo period */
+ fifo_mult = fifo_period / ts->chip.clock_period;
+ fifo_period = fifo_mult * ts->chip_period.val;
+ /* computes time interval between interrupt and this sample */
+ interval = (int64_t)(fifo_nb - fifo_no) * (int64_t)fifo_period;
+ ts->timestamp = ts->it.up - interval;
+ }
+}
+EXPORT_SYMBOL_NS_GPL(inv_sensors_timestamp_apply_odr, IIO_INV_SENSORS_TIMESTAMP);
+
+MODULE_AUTHOR("InvenSense, Inc.");
+MODULE_DESCRIPTION("InvenSense sensors timestamp module");
+MODULE_LICENSE("GPL");
diff --git a/drivers/iio/common/ms_sensors/Kconfig b/drivers/iio/common/ms_sensors/Kconfig
new file mode 100644
index 0000000000..45012b7ad6
--- /dev/null
+++ b/drivers/iio/common/ms_sensors/Kconfig
@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Measurements Specialties sensors common library
+#
+
+config IIO_MS_SENSORS_I2C
+ tristate
diff --git a/drivers/iio/common/ms_sensors/Makefile b/drivers/iio/common/ms_sensors/Makefile
new file mode 100644
index 0000000000..028573b9b7
--- /dev/null
+++ b/drivers/iio/common/ms_sensors/Makefile
@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Makefile for the Measurement Specialties sensor common modules.
+#
+
+obj-$(CONFIG_IIO_MS_SENSORS_I2C) += ms_sensors_i2c.o
diff --git a/drivers/iio/common/ms_sensors/ms_sensors_i2c.c b/drivers/iio/common/ms_sensors/ms_sensors_i2c.c
new file mode 100644
index 0000000000..9c9bc77003
--- /dev/null
+++ b/drivers/iio/common/ms_sensors/ms_sensors_i2c.c
@@ -0,0 +1,697 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Measurements Specialties driver common i2c functions
+ *
+ * Copyright (c) 2015 Measurement-Specialties
+ */
+
+#include <linux/module.h>
+#include <linux/iio/iio.h>
+#include <linux/device.h>
+#include <linux/delay.h>
+
+#include "ms_sensors_i2c.h"
+
+/* Conversion times in us */
+static const u16 ms_sensors_ht_t_conversion_time[] = { 50000, 25000,
+ 13000, 7000 };
+static const u16 ms_sensors_ht_h_conversion_time[] = { 16000, 5000,
+ 3000, 8000 };
+static const u16 ms_sensors_tp_conversion_time[] = { 500, 1100, 2100,
+ 4100, 8220, 16440 };
+
+#define MS_SENSORS_SERIAL_READ_MSB 0xFA0F
+#define MS_SENSORS_SERIAL_READ_LSB 0xFCC9
+#define MS_SENSORS_CONFIG_REG_WRITE 0xE6
+#define MS_SENSORS_CONFIG_REG_READ 0xE7
+#define MS_SENSORS_HT_T_CONVERSION_START 0xF3
+#define MS_SENSORS_HT_H_CONVERSION_START 0xF5
+
+#define MS_SENSORS_TP_PROM_READ 0xA0
+#define MS_SENSORS_TP_T_CONVERSION_START 0x50
+#define MS_SENSORS_TP_P_CONVERSION_START 0x40
+#define MS_SENSORS_TP_ADC_READ 0x00
+
+#define MS_SENSORS_NO_READ_CMD 0xFF
+
+/**
+ * ms_sensors_reset() - Reset function
+ * @cli: pointer to device client
+ * @cmd: reset cmd. Depends on device in use
+ * @delay: usleep minimal delay after reset command is issued
+ *
+ * Generic I2C reset function for Measurement Specialties devices.
+ *
+ * Return: 0 on success, negative errno otherwise.
+ */
+int ms_sensors_reset(void *cli, u8 cmd, unsigned int delay)
+{
+ int ret;
+ struct i2c_client *client = cli;
+
+ ret = i2c_smbus_write_byte(client, cmd);
+ if (ret) {
+ dev_err(&client->dev, "Failed to reset device\n");
+ return ret;
+ }
+ usleep_range(delay, delay + 1000);
+
+ return 0;
+}
+EXPORT_SYMBOL_NS(ms_sensors_reset, IIO_MEAS_SPEC_SENSORS);
+
+/**
+ * ms_sensors_read_prom_word() - PROM word read function
+ * @cli: pointer to device client
+ * @cmd: PROM read cmd. Depends on device and prom id
+ * @word: pointer to word destination value
+ *
+ * Generic i2c prom word read function for Measurement Specialties devices.
+ *
+ * Return: 0 on success, negative errno otherwise.
+ */
+int ms_sensors_read_prom_word(void *cli, int cmd, u16 *word)
+{
+ int ret;
+ struct i2c_client *client = cli;
+
+ ret = i2c_smbus_read_word_swapped(client, cmd);
+ if (ret < 0) {
+ dev_err(&client->dev, "Failed to read prom word\n");
+ return ret;
+ }
+ *word = ret;
+
+ return 0;
+}
+EXPORT_SYMBOL_NS(ms_sensors_read_prom_word, IIO_MEAS_SPEC_SENSORS);
+
+/**
+ * ms_sensors_convert_and_read() - ADC conversion & read function
+ * @cli: pointer to device client
+ * @conv: ADC conversion command. Depends on device in use
+ * @rd: ADC read command. Depends on device in use
+ * @delay: usleep minimal delay after conversion command is issued
+ * @adc: pointer to ADC destination value
+ *
+ * Generic ADC conversion & read function for Measurement Specialties
+ * devices.
+ * The function will issue conversion command, sleep appopriate delay, and
+ * issue command to read ADC.
+ *
+ * Return: 0 on success, negative errno otherwise.
+ */
+int ms_sensors_convert_and_read(void *cli, u8 conv, u8 rd,
+ unsigned int delay, u32 *adc)
+{
+ int ret;
+ __be32 buf = 0;
+ struct i2c_client *client = cli;
+
+ /* Trigger conversion */
+ ret = i2c_smbus_write_byte(client, conv);
+ if (ret)
+ goto err;
+ usleep_range(delay, delay + 1000);
+
+ /* Retrieve ADC value */
+ if (rd != MS_SENSORS_NO_READ_CMD)
+ ret = i2c_smbus_read_i2c_block_data(client, rd, 3, (u8 *)&buf);
+ else
+ ret = i2c_master_recv(client, (u8 *)&buf, 3);
+ if (ret < 0)
+ goto err;
+
+ dev_dbg(&client->dev, "ADC raw value : %x\n", be32_to_cpu(buf) >> 8);
+ *adc = be32_to_cpu(buf) >> 8;
+
+ return 0;
+err:
+ dev_err(&client->dev, "Unable to make sensor adc conversion\n");
+ return ret;
+}
+EXPORT_SYMBOL_NS(ms_sensors_convert_and_read, IIO_MEAS_SPEC_SENSORS);
+
+/**
+ * ms_sensors_crc_valid() - CRC check function
+ * @value: input and CRC compare value
+ *
+ * Cyclic Redundancy Check function used in TSYS02D, HTU21, MS8607.
+ * This function performs a x^8 + x^5 + x^4 + 1 polynomial CRC.
+ * The argument contains CRC value in LSB byte while the bytes 1 and 2
+ * are used for CRC computation.
+ *
+ * Return: 1 if CRC is valid, 0 otherwise.
+ */
+static bool ms_sensors_crc_valid(u32 value)
+{
+ u32 polynom = 0x988000; /* x^8 + x^5 + x^4 + 1 */
+ u32 msb = 0x800000;
+ u32 mask = 0xFF8000;
+ u32 result = value & 0xFFFF00;
+ u8 crc = value & 0xFF;
+
+ while (msb != 0x80) {
+ if (result & msb)
+ result = ((result ^ polynom) & mask)
+ | (result & ~mask);
+ msb >>= 1;
+ mask >>= 1;
+ polynom >>= 1;
+ }
+
+ return result == crc;
+}
+
+/**
+ * ms_sensors_read_serial() - Serial number read function
+ * @client: pointer to i2c client
+ * @sn: pointer to 64-bits destination value
+ *
+ * Generic i2c serial number read function for Measurement Specialties devices.
+ * This function is used for TSYS02d, HTU21, MS8607 chipset.
+ * Refer to datasheet:
+ * http://www.meas-spec.com/downloads/HTU2X_Serial_Number_Reading.pdf
+ *
+ * Sensor raw MSB serial number format is the following :
+ * [ SNB3, CRC, SNB2, CRC, SNB1, CRC, SNB0, CRC]
+ * Sensor raw LSB serial number format is the following :
+ * [ X, X, SNC1, SNC0, CRC, SNA1, SNA0, CRC]
+ * The resulting serial number is following :
+ * [ SNA1, SNA0, SNB3, SNB2, SNB1, SNB0, SNC1, SNC0]
+ *
+ * Return: 0 on success, negative errno otherwise.
+ */
+int ms_sensors_read_serial(struct i2c_client *client, u64 *sn)
+{
+ u8 i;
+ __be64 rcv_buf = 0;
+ u64 rcv_val;
+ __be16 send_buf;
+ int ret;
+
+ struct i2c_msg msg[2] = {
+ {
+ .addr = client->addr,
+ .flags = client->flags,
+ .len = 2,
+ .buf = (__u8 *)&send_buf,
+ },
+ {
+ .addr = client->addr,
+ .flags = client->flags | I2C_M_RD,
+ .buf = (__u8 *)&rcv_buf,
+ },
+ };
+
+ /* Read MSB part of serial number */
+ send_buf = cpu_to_be16(MS_SENSORS_SERIAL_READ_MSB);
+ msg[1].len = 8;
+ ret = i2c_transfer(client->adapter, msg, 2);
+ if (ret < 0) {
+ dev_err(&client->dev, "Unable to read device serial number");
+ return ret;
+ }
+
+ rcv_val = be64_to_cpu(rcv_buf);
+ dev_dbg(&client->dev, "Serial MSB raw : %llx\n", rcv_val);
+
+ for (i = 0; i < 64; i += 16) {
+ if (!ms_sensors_crc_valid((rcv_val >> i) & 0xFFFF))
+ return -ENODEV;
+ }
+
+ *sn = (((rcv_val >> 32) & 0xFF000000) |
+ ((rcv_val >> 24) & 0x00FF0000) |
+ ((rcv_val >> 16) & 0x0000FF00) |
+ ((rcv_val >> 8) & 0x000000FF)) << 16;
+
+ /* Read LSB part of serial number */
+ send_buf = cpu_to_be16(MS_SENSORS_SERIAL_READ_LSB);
+ msg[1].len = 6;
+ rcv_buf = 0;
+ ret = i2c_transfer(client->adapter, msg, 2);
+ if (ret < 0) {
+ dev_err(&client->dev, "Unable to read device serial number");
+ return ret;
+ }
+
+ rcv_val = be64_to_cpu(rcv_buf) >> 16;
+ dev_dbg(&client->dev, "Serial MSB raw : %llx\n", rcv_val);
+
+ for (i = 0; i < 48; i += 24) {
+ if (!ms_sensors_crc_valid((rcv_val >> i) & 0xFFFFFF))
+ return -ENODEV;
+ }
+
+ *sn |= (rcv_val & 0xFFFF00) << 40 | (rcv_val >> 32);
+
+ return 0;
+}
+EXPORT_SYMBOL_NS(ms_sensors_read_serial, IIO_MEAS_SPEC_SENSORS);
+
+static int ms_sensors_read_config_reg(struct i2c_client *client,
+ u8 *config_reg)
+{
+ int ret;
+
+ ret = i2c_smbus_write_byte(client, MS_SENSORS_CONFIG_REG_READ);
+ if (ret) {
+ dev_err(&client->dev, "Unable to read config register");
+ return ret;
+ }
+
+ ret = i2c_master_recv(client, config_reg, 1);
+ if (ret < 0) {
+ dev_err(&client->dev, "Unable to read config register");
+ return ret;
+ }
+ dev_dbg(&client->dev, "Config register :%x\n", *config_reg);
+
+ return 0;
+}
+
+/**
+ * ms_sensors_write_resolution() - Set resolution function
+ * @dev_data: pointer to temperature/humidity device data
+ * @i: resolution index to set
+ *
+ * This function will program the appropriate resolution based on the index
+ * provided when user space will set samp_freq channel.
+ * This function is used for TSYS02D, HTU21 and MS8607 chipsets.
+ *
+ * Return: 0 on success, negative errno otherwise.
+ */
+ssize_t ms_sensors_write_resolution(struct ms_ht_dev *dev_data,
+ u8 i)
+{
+ u8 config_reg;
+ int ret;
+
+ ret = ms_sensors_read_config_reg(dev_data->client, &config_reg);
+ if (ret)
+ return ret;
+
+ config_reg &= 0x7E;
+ config_reg |= ((i & 1) << 7) + ((i & 2) >> 1);
+
+ return i2c_smbus_write_byte_data(dev_data->client,
+ MS_SENSORS_CONFIG_REG_WRITE,
+ config_reg);
+}
+EXPORT_SYMBOL_NS(ms_sensors_write_resolution, IIO_MEAS_SPEC_SENSORS);
+
+/**
+ * ms_sensors_show_battery_low() - Show device battery low indicator
+ * @dev_data: pointer to temperature/humidity device data
+ * @buf: pointer to char buffer to write result
+ *
+ * This function will read battery indicator value in the device and
+ * return 1 if the device voltage is below 2.25V.
+ * This function is used for TSYS02D, HTU21 and MS8607 chipsets.
+ *
+ * Return: length of sprintf on success, negative errno otherwise.
+ */
+ssize_t ms_sensors_show_battery_low(struct ms_ht_dev *dev_data,
+ char *buf)
+{
+ int ret;
+ u8 config_reg;
+
+ mutex_lock(&dev_data->lock);
+ ret = ms_sensors_read_config_reg(dev_data->client, &config_reg);
+ mutex_unlock(&dev_data->lock);
+ if (ret)
+ return ret;
+
+ return sysfs_emit(buf, "%d\n", (config_reg & 0x40) >> 6);
+}
+EXPORT_SYMBOL_NS(ms_sensors_show_battery_low, IIO_MEAS_SPEC_SENSORS);
+
+/**
+ * ms_sensors_show_heater() - Show device heater
+ * @dev_data: pointer to temperature/humidity device data
+ * @buf: pointer to char buffer to write result
+ *
+ * This function will read heater enable value in the device and
+ * return 1 if the heater is enabled.
+ * This function is used for HTU21 and MS8607 chipsets.
+ *
+ * Return: length of sprintf on success, negative errno otherwise.
+ */
+ssize_t ms_sensors_show_heater(struct ms_ht_dev *dev_data,
+ char *buf)
+{
+ u8 config_reg;
+ int ret;
+
+ mutex_lock(&dev_data->lock);
+ ret = ms_sensors_read_config_reg(dev_data->client, &config_reg);
+ mutex_unlock(&dev_data->lock);
+ if (ret)
+ return ret;
+
+ return sysfs_emit(buf, "%d\n", (config_reg & 0x4) >> 2);
+}
+EXPORT_SYMBOL_NS(ms_sensors_show_heater, IIO_MEAS_SPEC_SENSORS);
+
+/**
+ * ms_sensors_write_heater() - Write device heater
+ * @dev_data: pointer to temperature/humidity device data
+ * @buf: pointer to char buffer from user space
+ * @len: length of buf
+ *
+ * This function will write 1 or 0 value in the device
+ * to enable or disable heater.
+ * This function is used for HTU21 and MS8607 chipsets.
+ *
+ * Return: length of buffer, negative errno otherwise.
+ */
+ssize_t ms_sensors_write_heater(struct ms_ht_dev *dev_data,
+ const char *buf, size_t len)
+{
+ u8 val, config_reg;
+ int ret;
+
+ ret = kstrtou8(buf, 10, &val);
+ if (ret)
+ return ret;
+
+ if (val > 1)
+ return -EINVAL;
+
+ mutex_lock(&dev_data->lock);
+ ret = ms_sensors_read_config_reg(dev_data->client, &config_reg);
+ if (ret) {
+ mutex_unlock(&dev_data->lock);
+ return ret;
+ }
+
+ config_reg &= 0xFB;
+ config_reg |= val << 2;
+
+ ret = i2c_smbus_write_byte_data(dev_data->client,
+ MS_SENSORS_CONFIG_REG_WRITE,
+ config_reg);
+ mutex_unlock(&dev_data->lock);
+ if (ret) {
+ dev_err(&dev_data->client->dev, "Unable to write config register\n");
+ return ret;
+ }
+
+ return len;
+}
+EXPORT_SYMBOL_NS(ms_sensors_write_heater, IIO_MEAS_SPEC_SENSORS);
+
+/**
+ * ms_sensors_ht_read_temperature() - Read temperature
+ * @dev_data: pointer to temperature/humidity device data
+ * @temperature:pointer to temperature destination value
+ *
+ * This function will get temperature ADC value from the device,
+ * check the CRC and compute the temperature value.
+ * This function is used for TSYS02D, HTU21 and MS8607 chipsets.
+ *
+ * Return: 0 on success, negative errno otherwise.
+ */
+int ms_sensors_ht_read_temperature(struct ms_ht_dev *dev_data,
+ s32 *temperature)
+{
+ int ret;
+ u32 adc;
+ u16 delay;
+
+ mutex_lock(&dev_data->lock);
+ delay = ms_sensors_ht_t_conversion_time[dev_data->res_index];
+ ret = ms_sensors_convert_and_read(dev_data->client,
+ MS_SENSORS_HT_T_CONVERSION_START,
+ MS_SENSORS_NO_READ_CMD,
+ delay, &adc);
+ mutex_unlock(&dev_data->lock);
+ if (ret)
+ return ret;
+
+ if (!ms_sensors_crc_valid(adc)) {
+ dev_err(&dev_data->client->dev,
+ "Temperature read crc check error\n");
+ return -ENODEV;
+ }
+
+ /* Temperature algorithm */
+ *temperature = (((s64)(adc >> 8) * 175720) >> 16) - 46850;
+
+ return 0;
+}
+EXPORT_SYMBOL_NS(ms_sensors_ht_read_temperature, IIO_MEAS_SPEC_SENSORS);
+
+/**
+ * ms_sensors_ht_read_humidity() - Read humidity
+ * @dev_data: pointer to temperature/humidity device data
+ * @humidity: pointer to humidity destination value
+ *
+ * This function will get humidity ADC value from the device,
+ * check the CRC and compute the temperature value.
+ * This function is used for HTU21 and MS8607 chipsets.
+ *
+ * Return: 0 on success, negative errno otherwise.
+ */
+int ms_sensors_ht_read_humidity(struct ms_ht_dev *dev_data,
+ u32 *humidity)
+{
+ int ret;
+ u32 adc;
+ u16 delay;
+
+ mutex_lock(&dev_data->lock);
+ delay = ms_sensors_ht_h_conversion_time[dev_data->res_index];
+ ret = ms_sensors_convert_and_read(dev_data->client,
+ MS_SENSORS_HT_H_CONVERSION_START,
+ MS_SENSORS_NO_READ_CMD,
+ delay, &adc);
+ mutex_unlock(&dev_data->lock);
+ if (ret)
+ return ret;
+
+ if (!ms_sensors_crc_valid(adc)) {
+ dev_err(&dev_data->client->dev,
+ "Humidity read crc check error\n");
+ return -ENODEV;
+ }
+
+ /* Humidity algorithm */
+ *humidity = (((s32)(adc >> 8) * 12500) >> 16) * 10 - 6000;
+ if (*humidity >= 100000)
+ *humidity = 100000;
+
+ return 0;
+}
+EXPORT_SYMBOL_NS(ms_sensors_ht_read_humidity, IIO_MEAS_SPEC_SENSORS);
+
+/**
+ * ms_sensors_tp_crc4() - Calculate PROM CRC for
+ * Temperature and pressure devices.
+ * This function is only used when reading PROM coefficients
+ *
+ * @prom: pointer to PROM coefficients array
+ *
+ * Return: CRC.
+ */
+static u8 ms_sensors_tp_crc4(u16 *prom)
+{
+ unsigned int cnt, n_bit;
+ u16 n_rem = 0x0000;
+
+ for (cnt = 0; cnt < MS_SENSORS_TP_PROM_WORDS_NB * 2; cnt++) {
+ if (cnt % 2 == 1)
+ n_rem ^= prom[cnt >> 1] & 0x00FF;
+ else
+ n_rem ^= prom[cnt >> 1] >> 8;
+
+ for (n_bit = 8; n_bit > 0; n_bit--) {
+ if (n_rem & 0x8000)
+ n_rem = (n_rem << 1) ^ 0x3000;
+ else
+ n_rem <<= 1;
+ }
+ }
+
+ return n_rem >> 12;
+}
+
+/**
+ * ms_sensors_tp_crc_valid_112() - CRC check function for
+ * Temperature and pressure devices for 112bit PROM.
+ * This function is only used when reading PROM coefficients
+ *
+ * @prom: pointer to PROM coefficients array
+ *
+ * Return: True if CRC is ok.
+ */
+static bool ms_sensors_tp_crc_valid_112(u16 *prom)
+{
+ u16 w0 = prom[0], crc_read = (w0 & 0xF000) >> 12;
+ u8 crc;
+
+ prom[0] &= 0x0FFF; /* Clear the CRC computation part */
+ prom[MS_SENSORS_TP_PROM_WORDS_NB - 1] = 0;
+
+ crc = ms_sensors_tp_crc4(prom);
+
+ prom[0] = w0;
+
+ return crc == crc_read;
+}
+
+/**
+ * ms_sensors_tp_crc_valid_128() - CRC check function for
+ * Temperature and pressure devices for 128bit PROM.
+ * This function is only used when reading PROM coefficients
+ *
+ * @prom: pointer to PROM coefficients array
+ *
+ * Return: True if CRC is ok.
+ */
+static bool ms_sensors_tp_crc_valid_128(u16 *prom)
+{
+ u16 w7 = prom[7], crc_read = w7 & 0x000F;
+ u8 crc;
+
+ prom[7] &= 0xFF00; /* Clear the CRC and LSB part */
+
+ crc = ms_sensors_tp_crc4(prom);
+
+ prom[7] = w7;
+
+ return crc == crc_read;
+}
+
+/**
+ * ms_sensors_tp_read_prom() - prom coeff read function
+ * @dev_data: pointer to temperature/pressure device data
+ *
+ * This function will read prom coefficients and check CRC.
+ * This function is used for MS5637 and MS8607 chipsets.
+ *
+ * Return: 0 on success, negative errno otherwise.
+ */
+int ms_sensors_tp_read_prom(struct ms_tp_dev *dev_data)
+{
+ int i, ret;
+ bool valid;
+
+ for (i = 0; i < dev_data->hw->prom_len; i++) {
+ ret = ms_sensors_read_prom_word(
+ dev_data->client,
+ MS_SENSORS_TP_PROM_READ + (i << 1),
+ &dev_data->prom[i]);
+
+ if (ret)
+ return ret;
+ }
+
+ if (dev_data->hw->prom_len == 8)
+ valid = ms_sensors_tp_crc_valid_128(dev_data->prom);
+ else
+ valid = ms_sensors_tp_crc_valid_112(dev_data->prom);
+
+ if (!valid) {
+ dev_err(&dev_data->client->dev,
+ "Calibration coefficients crc check error\n");
+ return -ENODEV;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_NS(ms_sensors_tp_read_prom, IIO_MEAS_SPEC_SENSORS);
+
+/**
+ * ms_sensors_read_temp_and_pressure() - read temp and pressure
+ * @dev_data: pointer to temperature/pressure device data
+ * @temperature:pointer to temperature destination value
+ * @pressure: pointer to pressure destination value
+ *
+ * This function will read ADC and compute pressure and temperature value.
+ * This function is used for MS5637 and MS8607 chipsets.
+ *
+ * Return: 0 on success, negative errno otherwise.
+ */
+int ms_sensors_read_temp_and_pressure(struct ms_tp_dev *dev_data,
+ int *temperature,
+ unsigned int *pressure)
+{
+ int ret;
+ u32 t_adc, p_adc;
+ s32 dt, temp;
+ s64 off, sens, t2, off2, sens2;
+ u16 *prom = dev_data->prom, delay;
+
+ mutex_lock(&dev_data->lock);
+ delay = ms_sensors_tp_conversion_time[dev_data->res_index];
+
+ ret = ms_sensors_convert_and_read(
+ dev_data->client,
+ MS_SENSORS_TP_T_CONVERSION_START +
+ dev_data->res_index * 2,
+ MS_SENSORS_TP_ADC_READ,
+ delay, &t_adc);
+ if (ret) {
+ mutex_unlock(&dev_data->lock);
+ return ret;
+ }
+
+ ret = ms_sensors_convert_and_read(
+ dev_data->client,
+ MS_SENSORS_TP_P_CONVERSION_START +
+ dev_data->res_index * 2,
+ MS_SENSORS_TP_ADC_READ,
+ delay, &p_adc);
+ mutex_unlock(&dev_data->lock);
+ if (ret)
+ return ret;
+
+ dt = (s32)t_adc - (prom[5] << 8);
+
+ /* Actual temperature = 2000 + dT * TEMPSENS */
+ temp = 2000 + (((s64)dt * prom[6]) >> 23);
+
+ /* Second order temperature compensation */
+ if (temp < 2000) {
+ s64 tmp = (s64)temp - 2000;
+
+ t2 = (3 * ((s64)dt * (s64)dt)) >> 33;
+ off2 = (61 * tmp * tmp) >> 4;
+ sens2 = (29 * tmp * tmp) >> 4;
+
+ if (temp < -1500) {
+ s64 tmp = (s64)temp + 1500;
+
+ off2 += 17 * tmp * tmp;
+ sens2 += 9 * tmp * tmp;
+ }
+ } else {
+ t2 = (5 * ((s64)dt * (s64)dt)) >> 38;
+ off2 = 0;
+ sens2 = 0;
+ }
+
+ /* OFF = OFF_T1 + TCO * dT */
+ off = (((s64)prom[2]) << 17) + ((((s64)prom[4]) * (s64)dt) >> 6);
+ off -= off2;
+
+ /* Sensitivity at actual temperature = SENS_T1 + TCS * dT */
+ sens = (((s64)prom[1]) << 16) + (((s64)prom[3] * dt) >> 7);
+ sens -= sens2;
+
+ /* Temperature compensated pressure = D1 * SENS - OFF */
+ *temperature = (temp - t2) * 10;
+ *pressure = (u32)(((((s64)p_adc * sens) >> 21) - off) >> 15);
+
+ return 0;
+}
+EXPORT_SYMBOL_NS(ms_sensors_read_temp_and_pressure, IIO_MEAS_SPEC_SENSORS);
+
+MODULE_DESCRIPTION("Measurement-Specialties common i2c driver");
+MODULE_AUTHOR("William Markezana <william.markezana@meas-spec.com>");
+MODULE_AUTHOR("Ludovic Tancerel <ludovic.tancerel@maplehightech.com>");
+MODULE_LICENSE("GPL v2");
+
diff --git a/drivers/iio/common/ms_sensors/ms_sensors_i2c.h b/drivers/iio/common/ms_sensors/ms_sensors_i2c.h
new file mode 100644
index 0000000000..f15b973f27
--- /dev/null
+++ b/drivers/iio/common/ms_sensors/ms_sensors_i2c.h
@@ -0,0 +1,74 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Measurements Specialties common sensor driver
+ *
+ * Copyright (c) 2015 Measurement-Specialties
+ */
+
+#ifndef _MS_SENSORS_I2C_H
+#define _MS_SENSORS_I2C_H
+
+#include <linux/i2c.h>
+#include <linux/mutex.h>
+
+#define MS_SENSORS_TP_PROM_WORDS_NB 8
+
+/**
+ * struct ms_ht_dev - Humidity/Temperature sensor device structure
+ * @client: i2c client
+ * @lock: lock protecting the i2c conversion
+ * @res_index: index to selected sensor resolution
+ */
+struct ms_ht_dev {
+ struct i2c_client *client;
+ struct mutex lock;
+ u8 res_index;
+};
+
+/**
+ * struct ms_hw_data - Temperature/Pressure sensor hardware data
+ * @prom_len: number of words in the PROM
+ * @max_res_index: maximum sensor resolution index
+ */
+struct ms_tp_hw_data {
+ u8 prom_len;
+ u8 max_res_index;
+};
+
+/**
+ * struct ms_tp_dev - Temperature/Pressure sensor device structure
+ * @client: i2c client
+ * @lock: lock protecting the i2c conversion
+ * @prom: array of PROM coefficients used for conversion. Added element
+ * for CRC computation
+ * @res_index: index to selected sensor resolution
+ */
+struct ms_tp_dev {
+ struct i2c_client *client;
+ struct mutex lock;
+ const struct ms_tp_hw_data *hw;
+ u16 prom[MS_SENSORS_TP_PROM_WORDS_NB];
+ u8 res_index;
+};
+
+int ms_sensors_reset(void *cli, u8 cmd, unsigned int delay);
+int ms_sensors_read_prom_word(void *cli, int cmd, u16 *word);
+int ms_sensors_convert_and_read(void *cli, u8 conv, u8 rd,
+ unsigned int delay, u32 *adc);
+int ms_sensors_read_serial(struct i2c_client *client, u64 *sn);
+ssize_t ms_sensors_show_serial(struct ms_ht_dev *dev_data, char *buf);
+ssize_t ms_sensors_write_resolution(struct ms_ht_dev *dev_data, u8 i);
+ssize_t ms_sensors_show_battery_low(struct ms_ht_dev *dev_data, char *buf);
+ssize_t ms_sensors_show_heater(struct ms_ht_dev *dev_data, char *buf);
+ssize_t ms_sensors_write_heater(struct ms_ht_dev *dev_data,
+ const char *buf, size_t len);
+int ms_sensors_ht_read_temperature(struct ms_ht_dev *dev_data,
+ s32 *temperature);
+int ms_sensors_ht_read_humidity(struct ms_ht_dev *dev_data,
+ u32 *humidity);
+int ms_sensors_tp_read_prom(struct ms_tp_dev *dev_data);
+int ms_sensors_read_temp_and_pressure(struct ms_tp_dev *dev_data,
+ int *temperature,
+ unsigned int *pressure);
+
+#endif /* _MS_SENSORS_I2C_H */
diff --git a/drivers/iio/common/scmi_sensors/Kconfig b/drivers/iio/common/scmi_sensors/Kconfig
new file mode 100644
index 0000000000..67e084cbb1
--- /dev/null
+++ b/drivers/iio/common/scmi_sensors/Kconfig
@@ -0,0 +1,18 @@
+#
+# IIO over SCMI
+#
+# When adding new entries keep the list in alphabetical order
+
+menu "IIO SCMI Sensors"
+
+config IIO_SCMI
+ tristate "IIO SCMI"
+ depends on ARM_SCMI_PROTOCOL
+ select IIO_BUFFER
+ select IIO_KFIFO_BUF
+ help
+ Say yes here to build support for IIO SCMI Driver.
+ This provides ARM SCMI Protocol based IIO device.
+ This driver provides support for accelerometer and gyroscope
+ sensors available on SCMI based platforms.
+endmenu
diff --git a/drivers/iio/common/scmi_sensors/Makefile b/drivers/iio/common/scmi_sensors/Makefile
new file mode 100644
index 0000000000..645e0fce1a
--- /dev/null
+++ b/drivers/iio/common/scmi_sensors/Makefile
@@ -0,0 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Makefile for the IIO over SCMI
+#
+obj-$(CONFIG_IIO_SCMI) += scmi_iio.o
diff --git a/drivers/iio/common/scmi_sensors/scmi_iio.c b/drivers/iio/common/scmi_sensors/scmi_iio.c
new file mode 100644
index 0000000000..0c2caf3570
--- /dev/null
+++ b/drivers/iio/common/scmi_sensors/scmi_iio.c
@@ -0,0 +1,730 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/*
+ * System Control and Management Interface(SCMI) based IIO sensor driver
+ *
+ * Copyright (C) 2021 Google LLC
+ */
+
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/iio/buffer.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/kfifo_buf.h>
+#include <linux/iio/sysfs.h>
+#include <linux/kernel.h>
+#include <linux/kthread.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/scmi_protocol.h>
+#include <linux/time.h>
+#include <linux/types.h>
+#include <linux/units.h>
+
+#define SCMI_IIO_NUM_OF_AXIS 3
+
+struct scmi_iio_priv {
+ const struct scmi_sensor_proto_ops *sensor_ops;
+ struct scmi_protocol_handle *ph;
+ const struct scmi_sensor_info *sensor_info;
+ struct iio_dev *indio_dev;
+ /* lock to protect against multiple access to the device */
+ struct mutex lock;
+ /* adding one additional channel for timestamp */
+ s64 iio_buf[SCMI_IIO_NUM_OF_AXIS + 1];
+ struct notifier_block sensor_update_nb;
+ u32 *freq_avail;
+};
+
+static int scmi_iio_sensor_update_cb(struct notifier_block *nb,
+ unsigned long event, void *data)
+{
+ struct scmi_sensor_update_report *sensor_update = data;
+ struct iio_dev *scmi_iio_dev;
+ struct scmi_iio_priv *sensor;
+ s8 tstamp_scale;
+ u64 time, time_ns;
+ int i;
+
+ if (sensor_update->readings_count == 0)
+ return NOTIFY_DONE;
+
+ sensor = container_of(nb, struct scmi_iio_priv, sensor_update_nb);
+
+ for (i = 0; i < sensor_update->readings_count; i++)
+ sensor->iio_buf[i] = sensor_update->readings[i].value;
+
+ if (!sensor->sensor_info->timestamped) {
+ time_ns = ktime_to_ns(sensor_update->timestamp);
+ } else {
+ /*
+ * All the axes are supposed to have the same value for timestamp.
+ * We are just using the values from the Axis 0 here.
+ */
+ time = sensor_update->readings[0].timestamp;
+
+ /*
+ * Timestamp returned by SCMI is in seconds and is equal to
+ * time * power-of-10 multiplier(tstamp_scale) seconds.
+ * Converting the timestamp to nanoseconds below.
+ */
+ tstamp_scale = sensor->sensor_info->tstamp_scale +
+ const_ilog2(NSEC_PER_SEC) / const_ilog2(10);
+ if (tstamp_scale < 0) {
+ do_div(time, int_pow(10, abs(tstamp_scale)));
+ time_ns = time;
+ } else {
+ time_ns = time * int_pow(10, tstamp_scale);
+ }
+ }
+
+ scmi_iio_dev = sensor->indio_dev;
+ iio_push_to_buffers_with_timestamp(scmi_iio_dev, sensor->iio_buf,
+ time_ns);
+ return NOTIFY_OK;
+}
+
+static int scmi_iio_buffer_preenable(struct iio_dev *iio_dev)
+{
+ struct scmi_iio_priv *sensor = iio_priv(iio_dev);
+ u32 sensor_config = 0;
+ int err;
+
+ if (sensor->sensor_info->timestamped)
+ sensor_config |= FIELD_PREP(SCMI_SENS_CFG_TSTAMP_ENABLED_MASK,
+ SCMI_SENS_CFG_TSTAMP_ENABLE);
+
+ sensor_config |= FIELD_PREP(SCMI_SENS_CFG_SENSOR_ENABLED_MASK,
+ SCMI_SENS_CFG_SENSOR_ENABLE);
+ err = sensor->sensor_ops->config_set(sensor->ph,
+ sensor->sensor_info->id,
+ sensor_config);
+ if (err)
+ dev_err(&iio_dev->dev, "Error in enabling sensor %s err %d",
+ sensor->sensor_info->name, err);
+
+ return err;
+}
+
+static int scmi_iio_buffer_postdisable(struct iio_dev *iio_dev)
+{
+ struct scmi_iio_priv *sensor = iio_priv(iio_dev);
+ u32 sensor_config = 0;
+ int err;
+
+ sensor_config |= FIELD_PREP(SCMI_SENS_CFG_SENSOR_ENABLED_MASK,
+ SCMI_SENS_CFG_SENSOR_DISABLE);
+ err = sensor->sensor_ops->config_set(sensor->ph,
+ sensor->sensor_info->id,
+ sensor_config);
+ if (err) {
+ dev_err(&iio_dev->dev,
+ "Error in disabling sensor %s with err %d",
+ sensor->sensor_info->name, err);
+ }
+
+ return err;
+}
+
+static const struct iio_buffer_setup_ops scmi_iio_buffer_ops = {
+ .preenable = scmi_iio_buffer_preenable,
+ .postdisable = scmi_iio_buffer_postdisable,
+};
+
+static int scmi_iio_set_odr_val(struct iio_dev *iio_dev, int val, int val2)
+{
+ struct scmi_iio_priv *sensor = iio_priv(iio_dev);
+ u64 sec, mult, uHz, sf;
+ u32 sensor_config;
+ char buf[32];
+
+ int err = sensor->sensor_ops->config_get(sensor->ph,
+ sensor->sensor_info->id,
+ &sensor_config);
+ if (err) {
+ dev_err(&iio_dev->dev,
+ "Error in getting sensor config for sensor %s err %d",
+ sensor->sensor_info->name, err);
+ return err;
+ }
+
+ uHz = val * MICROHZ_PER_HZ + val2;
+
+ /*
+ * The seconds field in the sensor interval in SCMI is 16 bits long
+ * Therefore seconds = 1/Hz <= 0xFFFF. As floating point calculations are
+ * discouraged in the kernel driver code, to calculate the scale factor (sf)
+ * (1* 1000000 * sf)/uHz <= 0xFFFF. Therefore, sf <= (uHz * 0xFFFF)/1000000
+ * To calculate the multiplier,we convert the sf into char string and
+ * count the number of characters
+ */
+ sf = (u64)uHz * 0xFFFF;
+ do_div(sf, MICROHZ_PER_HZ);
+ mult = scnprintf(buf, sizeof(buf), "%llu", sf) - 1;
+
+ sec = int_pow(10, mult) * MICROHZ_PER_HZ;
+ do_div(sec, uHz);
+ if (sec == 0) {
+ dev_err(&iio_dev->dev,
+ "Trying to set invalid sensor update value for sensor %s",
+ sensor->sensor_info->name);
+ return -EINVAL;
+ }
+
+ sensor_config &= ~SCMI_SENS_CFG_UPDATE_SECS_MASK;
+ sensor_config |= FIELD_PREP(SCMI_SENS_CFG_UPDATE_SECS_MASK, sec);
+ sensor_config &= ~SCMI_SENS_CFG_UPDATE_EXP_MASK;
+ sensor_config |= FIELD_PREP(SCMI_SENS_CFG_UPDATE_EXP_MASK, -mult);
+
+ if (sensor->sensor_info->timestamped) {
+ sensor_config &= ~SCMI_SENS_CFG_TSTAMP_ENABLED_MASK;
+ sensor_config |= FIELD_PREP(SCMI_SENS_CFG_TSTAMP_ENABLED_MASK,
+ SCMI_SENS_CFG_TSTAMP_ENABLE);
+ }
+
+ sensor_config &= ~SCMI_SENS_CFG_ROUND_MASK;
+ sensor_config |=
+ FIELD_PREP(SCMI_SENS_CFG_ROUND_MASK, SCMI_SENS_CFG_ROUND_AUTO);
+
+ err = sensor->sensor_ops->config_set(sensor->ph,
+ sensor->sensor_info->id,
+ sensor_config);
+ if (err)
+ dev_err(&iio_dev->dev,
+ "Error in setting sensor update interval for sensor %s value %u err %d",
+ sensor->sensor_info->name, sensor_config, err);
+
+ return err;
+}
+
+static int scmi_iio_write_raw(struct iio_dev *iio_dev,
+ struct iio_chan_spec const *chan, int val,
+ int val2, long mask)
+{
+ struct scmi_iio_priv *sensor = iio_priv(iio_dev);
+ int err;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ mutex_lock(&sensor->lock);
+ err = scmi_iio_set_odr_val(iio_dev, val, val2);
+ mutex_unlock(&sensor->lock);
+ return err;
+ default:
+ return -EINVAL;
+ }
+}
+
+static int scmi_iio_read_avail(struct iio_dev *iio_dev,
+ struct iio_chan_spec const *chan,
+ const int **vals, int *type, int *length,
+ long mask)
+{
+ struct scmi_iio_priv *sensor = iio_priv(iio_dev);
+
+ switch (mask) {
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ *vals = sensor->freq_avail;
+ *type = IIO_VAL_INT_PLUS_MICRO;
+ *length = sensor->sensor_info->intervals.count * 2;
+ if (sensor->sensor_info->intervals.segmented)
+ return IIO_AVAIL_RANGE;
+ else
+ return IIO_AVAIL_LIST;
+ default:
+ return -EINVAL;
+ }
+}
+
+static void convert_ns_to_freq(u64 interval_ns, u64 *hz, u64 *uhz)
+{
+ u64 rem, freq;
+
+ freq = NSEC_PER_SEC;
+ rem = do_div(freq, interval_ns);
+ *hz = freq;
+ *uhz = rem * 1000000UL;
+ do_div(*uhz, interval_ns);
+}
+
+static int scmi_iio_get_odr_val(struct iio_dev *iio_dev, int *val, int *val2)
+{
+ u64 sensor_update_interval, sensor_interval_mult, hz, uhz;
+ struct scmi_iio_priv *sensor = iio_priv(iio_dev);
+ u32 sensor_config;
+ int mult;
+
+ int err = sensor->sensor_ops->config_get(sensor->ph,
+ sensor->sensor_info->id,
+ &sensor_config);
+ if (err) {
+ dev_err(&iio_dev->dev,
+ "Error in getting sensor config for sensor %s err %d",
+ sensor->sensor_info->name, err);
+ return err;
+ }
+
+ sensor_update_interval =
+ SCMI_SENS_CFG_GET_UPDATE_SECS(sensor_config) * NSEC_PER_SEC;
+
+ mult = SCMI_SENS_CFG_GET_UPDATE_EXP(sensor_config);
+ if (mult < 0) {
+ sensor_interval_mult = int_pow(10, abs(mult));
+ do_div(sensor_update_interval, sensor_interval_mult);
+ } else {
+ sensor_interval_mult = int_pow(10, mult);
+ sensor_update_interval =
+ sensor_update_interval * sensor_interval_mult;
+ }
+
+ convert_ns_to_freq(sensor_update_interval, &hz, &uhz);
+ *val = hz;
+ *val2 = uhz;
+ return 0;
+}
+
+static int scmi_iio_read_channel_data(struct iio_dev *iio_dev,
+ struct iio_chan_spec const *ch, int *val, int *val2)
+{
+ struct scmi_iio_priv *sensor = iio_priv(iio_dev);
+ u32 sensor_config;
+ struct scmi_sensor_reading readings[SCMI_IIO_NUM_OF_AXIS];
+ int err;
+
+ sensor_config = FIELD_PREP(SCMI_SENS_CFG_SENSOR_ENABLED_MASK,
+ SCMI_SENS_CFG_SENSOR_ENABLE);
+ err = sensor->sensor_ops->config_set(
+ sensor->ph, sensor->sensor_info->id, sensor_config);
+ if (err) {
+ dev_err(&iio_dev->dev,
+ "Error in enabling sensor %s err %d",
+ sensor->sensor_info->name, err);
+ return err;
+ }
+
+ err = sensor->sensor_ops->reading_get_timestamped(
+ sensor->ph, sensor->sensor_info->id,
+ sensor->sensor_info->num_axis, readings);
+ if (err) {
+ dev_err(&iio_dev->dev,
+ "Error in reading raw attribute for sensor %s err %d",
+ sensor->sensor_info->name, err);
+ return err;
+ }
+
+ sensor_config = FIELD_PREP(SCMI_SENS_CFG_SENSOR_ENABLED_MASK,
+ SCMI_SENS_CFG_SENSOR_DISABLE);
+ err = sensor->sensor_ops->config_set(
+ sensor->ph, sensor->sensor_info->id, sensor_config);
+ if (err) {
+ dev_err(&iio_dev->dev,
+ "Error in disabling sensor %s err %d",
+ sensor->sensor_info->name, err);
+ return err;
+ }
+
+ *val = lower_32_bits(readings[ch->scan_index].value);
+ *val2 = upper_32_bits(readings[ch->scan_index].value);
+
+ return IIO_VAL_INT_64;
+}
+
+static int scmi_iio_read_raw(struct iio_dev *iio_dev,
+ struct iio_chan_spec const *ch, int *val,
+ int *val2, long mask)
+{
+ struct scmi_iio_priv *sensor = iio_priv(iio_dev);
+ s8 scale;
+ int ret;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_SCALE:
+ scale = sensor->sensor_info->axis[ch->scan_index].scale;
+ if (scale < 0) {
+ *val = 1;
+ *val2 = int_pow(10, abs(scale));
+ return IIO_VAL_FRACTIONAL;
+ }
+ *val = int_pow(10, scale);
+ return IIO_VAL_INT;
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ ret = scmi_iio_get_odr_val(iio_dev, val, val2);
+ return ret ? ret : IIO_VAL_INT_PLUS_MICRO;
+ case IIO_CHAN_INFO_RAW:
+ ret = iio_device_claim_direct_mode(iio_dev);
+ if (ret)
+ return ret;
+
+ ret = scmi_iio_read_channel_data(iio_dev, ch, val, val2);
+ iio_device_release_direct_mode(iio_dev);
+ return ret;
+ default:
+ return -EINVAL;
+ }
+}
+
+static const struct iio_info scmi_iio_info = {
+ .read_raw = scmi_iio_read_raw,
+ .read_avail = scmi_iio_read_avail,
+ .write_raw = scmi_iio_write_raw,
+};
+
+static ssize_t scmi_iio_get_raw_available(struct iio_dev *iio_dev,
+ uintptr_t private,
+ const struct iio_chan_spec *chan,
+ char *buf)
+{
+ struct scmi_iio_priv *sensor = iio_priv(iio_dev);
+ u64 resolution, rem;
+ s64 min_range, max_range;
+ s8 exponent, scale;
+ int len = 0;
+
+ /*
+ * All the axes are supposed to have the same value for range and resolution.
+ * We are just using the values from the Axis 0 here.
+ */
+ if (sensor->sensor_info->axis[0].extended_attrs) {
+ min_range = sensor->sensor_info->axis[0].attrs.min_range;
+ max_range = sensor->sensor_info->axis[0].attrs.max_range;
+ resolution = sensor->sensor_info->axis[0].resolution;
+ exponent = sensor->sensor_info->axis[0].exponent;
+ scale = sensor->sensor_info->axis[0].scale;
+
+ /*
+ * To provide the raw value for the resolution to the userspace,
+ * need to divide the resolution exponent by the sensor scale
+ */
+ exponent = exponent - scale;
+ if (exponent < 0) {
+ rem = do_div(resolution,
+ int_pow(10, abs(exponent))
+ );
+ len = sysfs_emit(buf,
+ "[%lld %llu.%llu %lld]\n", min_range,
+ resolution, rem, max_range);
+ } else {
+ resolution = resolution * int_pow(10, exponent);
+ len = sysfs_emit(buf, "[%lld %llu %lld]\n",
+ min_range, resolution, max_range);
+ }
+ }
+ return len;
+}
+
+static const struct iio_chan_spec_ext_info scmi_iio_ext_info[] = {
+ {
+ .name = "raw_available",
+ .read = scmi_iio_get_raw_available,
+ .shared = IIO_SHARED_BY_TYPE,
+ },
+ {},
+};
+
+static void scmi_iio_set_timestamp_channel(struct iio_chan_spec *iio_chan,
+ int scan_index)
+{
+ iio_chan->type = IIO_TIMESTAMP;
+ iio_chan->channel = -1;
+ iio_chan->scan_index = scan_index;
+ iio_chan->scan_type.sign = 'u';
+ iio_chan->scan_type.realbits = 64;
+ iio_chan->scan_type.storagebits = 64;
+}
+
+static void scmi_iio_set_data_channel(struct iio_chan_spec *iio_chan,
+ enum iio_chan_type type,
+ enum iio_modifier mod, int scan_index)
+{
+ iio_chan->type = type;
+ iio_chan->modified = 1;
+ iio_chan->channel2 = mod;
+ iio_chan->info_mask_separate =
+ BIT(IIO_CHAN_INFO_SCALE) | BIT(IIO_CHAN_INFO_RAW);
+ iio_chan->info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ);
+ iio_chan->info_mask_shared_by_type_available =
+ BIT(IIO_CHAN_INFO_SAMP_FREQ);
+ iio_chan->scan_index = scan_index;
+ iio_chan->scan_type.sign = 's';
+ iio_chan->scan_type.realbits = 64;
+ iio_chan->scan_type.storagebits = 64;
+ iio_chan->scan_type.endianness = IIO_LE;
+ iio_chan->ext_info = scmi_iio_ext_info;
+}
+
+static int scmi_iio_get_chan_modifier(const char *name,
+ enum iio_modifier *modifier)
+{
+ char *pch, mod;
+
+ if (!name)
+ return -EINVAL;
+
+ pch = strrchr(name, '_');
+ if (!pch)
+ return -EINVAL;
+
+ mod = *(pch + 1);
+ switch (mod) {
+ case 'X':
+ *modifier = IIO_MOD_X;
+ return 0;
+ case 'Y':
+ *modifier = IIO_MOD_Y;
+ return 0;
+ case 'Z':
+ *modifier = IIO_MOD_Z;
+ return 0;
+ default:
+ return -EINVAL;
+ }
+}
+
+static int scmi_iio_get_chan_type(u8 scmi_type, enum iio_chan_type *iio_type)
+{
+ switch (scmi_type) {
+ case METERS_SEC_SQUARED:
+ *iio_type = IIO_ACCEL;
+ return 0;
+ case RADIANS_SEC:
+ *iio_type = IIO_ANGL_VEL;
+ return 0;
+ default:
+ return -EINVAL;
+ }
+}
+
+static u64 scmi_iio_convert_interval_to_ns(u32 val)
+{
+ u64 sensor_update_interval =
+ SCMI_SENS_INTVL_GET_SECS(val) * NSEC_PER_SEC;
+ u64 sensor_interval_mult;
+ int mult;
+
+ mult = SCMI_SENS_INTVL_GET_EXP(val);
+ if (mult < 0) {
+ sensor_interval_mult = int_pow(10, abs(mult));
+ do_div(sensor_update_interval, sensor_interval_mult);
+ } else {
+ sensor_interval_mult = int_pow(10, mult);
+ sensor_update_interval =
+ sensor_update_interval * sensor_interval_mult;
+ }
+ return sensor_update_interval;
+}
+
+static int scmi_iio_set_sampling_freq_avail(struct iio_dev *iio_dev)
+{
+ u64 cur_interval_ns, low_interval_ns, high_interval_ns, step_size_ns,
+ hz, uhz;
+ unsigned int cur_interval, low_interval, high_interval, step_size;
+ struct scmi_iio_priv *sensor = iio_priv(iio_dev);
+ int i;
+
+ sensor->freq_avail =
+ devm_kzalloc(&iio_dev->dev,
+ sizeof(*sensor->freq_avail) *
+ (sensor->sensor_info->intervals.count * 2),
+ GFP_KERNEL);
+ if (!sensor->freq_avail)
+ return -ENOMEM;
+
+ if (sensor->sensor_info->intervals.segmented) {
+ low_interval = sensor->sensor_info->intervals
+ .desc[SCMI_SENS_INTVL_SEGMENT_LOW];
+ low_interval_ns = scmi_iio_convert_interval_to_ns(low_interval);
+ convert_ns_to_freq(low_interval_ns, &hz, &uhz);
+ sensor->freq_avail[0] = hz;
+ sensor->freq_avail[1] = uhz;
+
+ step_size = sensor->sensor_info->intervals
+ .desc[SCMI_SENS_INTVL_SEGMENT_STEP];
+ step_size_ns = scmi_iio_convert_interval_to_ns(step_size);
+ convert_ns_to_freq(step_size_ns, &hz, &uhz);
+ sensor->freq_avail[2] = hz;
+ sensor->freq_avail[3] = uhz;
+
+ high_interval = sensor->sensor_info->intervals
+ .desc[SCMI_SENS_INTVL_SEGMENT_HIGH];
+ high_interval_ns =
+ scmi_iio_convert_interval_to_ns(high_interval);
+ convert_ns_to_freq(high_interval_ns, &hz, &uhz);
+ sensor->freq_avail[4] = hz;
+ sensor->freq_avail[5] = uhz;
+ } else {
+ for (i = 0; i < sensor->sensor_info->intervals.count; i++) {
+ cur_interval = sensor->sensor_info->intervals.desc[i];
+ cur_interval_ns =
+ scmi_iio_convert_interval_to_ns(cur_interval);
+ convert_ns_to_freq(cur_interval_ns, &hz, &uhz);
+ sensor->freq_avail[i * 2] = hz;
+ sensor->freq_avail[i * 2 + 1] = uhz;
+ }
+ }
+ return 0;
+}
+
+static struct iio_dev *
+scmi_alloc_iiodev(struct scmi_device *sdev,
+ const struct scmi_sensor_proto_ops *ops,
+ struct scmi_protocol_handle *ph,
+ const struct scmi_sensor_info *sensor_info)
+{
+ struct iio_chan_spec *iio_channels;
+ struct scmi_iio_priv *sensor;
+ enum iio_modifier modifier;
+ enum iio_chan_type type;
+ struct iio_dev *iiodev;
+ struct device *dev = &sdev->dev;
+ const struct scmi_handle *handle = sdev->handle;
+ int i, ret;
+
+ iiodev = devm_iio_device_alloc(dev, sizeof(*sensor));
+ if (!iiodev)
+ return ERR_PTR(-ENOMEM);
+
+ iiodev->modes = INDIO_DIRECT_MODE;
+ sensor = iio_priv(iiodev);
+ sensor->sensor_ops = ops;
+ sensor->ph = ph;
+ sensor->sensor_info = sensor_info;
+ sensor->sensor_update_nb.notifier_call = scmi_iio_sensor_update_cb;
+ sensor->indio_dev = iiodev;
+ mutex_init(&sensor->lock);
+
+ /* adding one additional channel for timestamp */
+ iiodev->num_channels = sensor_info->num_axis + 1;
+ iiodev->name = sensor_info->name;
+ iiodev->info = &scmi_iio_info;
+
+ iio_channels =
+ devm_kzalloc(dev,
+ sizeof(*iio_channels) * (iiodev->num_channels),
+ GFP_KERNEL);
+ if (!iio_channels)
+ return ERR_PTR(-ENOMEM);
+
+ ret = scmi_iio_set_sampling_freq_avail(iiodev);
+ if (ret < 0)
+ return ERR_PTR(ret);
+
+ for (i = 0; i < sensor_info->num_axis; i++) {
+ ret = scmi_iio_get_chan_type(sensor_info->axis[i].type, &type);
+ if (ret < 0)
+ return ERR_PTR(ret);
+
+ ret = scmi_iio_get_chan_modifier(sensor_info->axis[i].name,
+ &modifier);
+ if (ret < 0)
+ return ERR_PTR(ret);
+
+ scmi_iio_set_data_channel(&iio_channels[i], type, modifier,
+ sensor_info->axis[i].id);
+ }
+
+ ret = handle->notify_ops->devm_event_notifier_register(sdev,
+ SCMI_PROTOCOL_SENSOR, SCMI_EVENT_SENSOR_UPDATE,
+ &sensor->sensor_info->id,
+ &sensor->sensor_update_nb);
+ if (ret) {
+ dev_err(&iiodev->dev,
+ "Error in registering sensor update notifier for sensor %s err %d",
+ sensor->sensor_info->name, ret);
+ return ERR_PTR(ret);
+ }
+
+ scmi_iio_set_timestamp_channel(&iio_channels[i], i);
+ iiodev->channels = iio_channels;
+ return iiodev;
+}
+
+static int scmi_iio_dev_probe(struct scmi_device *sdev)
+{
+ const struct scmi_sensor_info *sensor_info;
+ struct scmi_handle *handle = sdev->handle;
+ const struct scmi_sensor_proto_ops *sensor_ops;
+ struct scmi_protocol_handle *ph;
+ struct device *dev = &sdev->dev;
+ struct iio_dev *scmi_iio_dev;
+ u16 nr_sensors;
+ int err = -ENODEV, i;
+
+ if (!handle)
+ return -ENODEV;
+
+ sensor_ops = handle->devm_protocol_get(sdev, SCMI_PROTOCOL_SENSOR, &ph);
+ if (IS_ERR(sensor_ops)) {
+ dev_err(dev, "SCMI device has no sensor interface\n");
+ return PTR_ERR(sensor_ops);
+ }
+
+ nr_sensors = sensor_ops->count_get(ph);
+ if (!nr_sensors) {
+ dev_dbg(dev, "0 sensors found via SCMI bus\n");
+ return -ENODEV;
+ }
+
+ for (i = 0; i < nr_sensors; i++) {
+ sensor_info = sensor_ops->info_get(ph, i);
+ if (!sensor_info) {
+ dev_err(dev, "SCMI sensor %d has missing info\n", i);
+ return -EINVAL;
+ }
+
+ /* This driver only supports 3-axis accel and gyro, skipping other sensors */
+ if (sensor_info->num_axis != SCMI_IIO_NUM_OF_AXIS)
+ continue;
+
+ /* This driver only supports 3-axis accel and gyro, skipping other sensors */
+ if (sensor_info->axis[0].type != METERS_SEC_SQUARED &&
+ sensor_info->axis[0].type != RADIANS_SEC)
+ continue;
+
+ scmi_iio_dev = scmi_alloc_iiodev(sdev, sensor_ops, ph,
+ sensor_info);
+ if (IS_ERR(scmi_iio_dev)) {
+ dev_err(dev,
+ "failed to allocate IIO device for sensor %s: %ld\n",
+ sensor_info->name, PTR_ERR(scmi_iio_dev));
+ return PTR_ERR(scmi_iio_dev);
+ }
+
+ err = devm_iio_kfifo_buffer_setup(&scmi_iio_dev->dev,
+ scmi_iio_dev,
+ &scmi_iio_buffer_ops);
+ if (err < 0) {
+ dev_err(dev,
+ "IIO buffer setup error at sensor %s: %d\n",
+ sensor_info->name, err);
+ return err;
+ }
+
+ err = devm_iio_device_register(dev, scmi_iio_dev);
+ if (err) {
+ dev_err(dev,
+ "IIO device registration failed at sensor %s: %d\n",
+ sensor_info->name, err);
+ return err;
+ }
+ }
+ return err;
+}
+
+static const struct scmi_device_id scmi_id_table[] = {
+ { SCMI_PROTOCOL_SENSOR, "iiodev" },
+ {},
+};
+
+MODULE_DEVICE_TABLE(scmi, scmi_id_table);
+
+static struct scmi_driver scmi_iiodev_driver = {
+ .name = "scmi-sensor-iiodev",
+ .probe = scmi_iio_dev_probe,
+ .id_table = scmi_id_table,
+};
+
+module_scmi_driver(scmi_iiodev_driver);
+
+MODULE_AUTHOR("Jyoti Bhayana <jbhayana@google.com>");
+MODULE_DESCRIPTION("SCMI IIO Driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/common/ssp_sensors/Kconfig b/drivers/iio/common/ssp_sensors/Kconfig
new file mode 100644
index 0000000000..5262409e44
--- /dev/null
+++ b/drivers/iio/common/ssp_sensors/Kconfig
@@ -0,0 +1,27 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# SSP sensor drivers and commons configuration
+#
+menu "SSP Sensor Common"
+
+config IIO_SSP_SENSORS_COMMONS
+ tristate "Commons for all SSP Sensor IIO drivers"
+ depends on IIO_SSP_SENSORHUB
+ select IIO_BUFFER
+ select IIO_KFIFO_BUF
+ help
+ Say yes here to build commons for SSP sensors.
+ To compile this as a module, choose M here: the module
+ will be called ssp_iio.
+
+config IIO_SSP_SENSORHUB
+ tristate "Samsung Sensorhub driver"
+ depends on SPI
+ select MFD_CORE
+ help
+ SSP driver for sensorhub.
+ If you say yes here you get ssp support for sensorhub.
+ To compile this driver as a module, choose M here: the
+ module will be called sensorhub.
+
+endmenu
diff --git a/drivers/iio/common/ssp_sensors/Makefile b/drivers/iio/common/ssp_sensors/Makefile
new file mode 100644
index 0000000000..ba831429b2
--- /dev/null
+++ b/drivers/iio/common/ssp_sensors/Makefile
@@ -0,0 +1,9 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Makefile for SSP sensor drivers and commons.
+#
+
+sensorhub-objs := ssp_dev.o ssp_spi.o
+obj-$(CONFIG_IIO_SSP_SENSORHUB) += sensorhub.o
+
+obj-$(CONFIG_IIO_SSP_SENSORS_COMMONS) += ssp_iio.o
diff --git a/drivers/iio/common/ssp_sensors/ssp.h b/drivers/iio/common/ssp_sensors/ssp.h
new file mode 100644
index 0000000000..f649cdecc2
--- /dev/null
+++ b/drivers/iio/common/ssp_sensors/ssp.h
@@ -0,0 +1,246 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2014, Samsung Electronics Co. Ltd. All Rights Reserved.
+ */
+
+#ifndef __SSP_SENSORHUB_H__
+#define __SSP_SENSORHUB_H__
+
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/iio/common/ssp_sensors.h>
+#include <linux/iio/iio.h>
+#include <linux/spi/spi.h>
+
+#define SSP_DEVICE_ID 0x55
+
+#ifdef SSP_DBG
+#define ssp_dbg(format, ...) pr_info("[SSP] "format, ##__VA_ARGS__)
+#else
+#define ssp_dbg(format, ...)
+#endif
+
+#define SSP_SW_RESET_TIME 3000
+/* Sensor polling in ms */
+#define SSP_DEFAULT_POLLING_DELAY 200
+#define SSP_DEFAULT_RETRIES 3
+#define SSP_DATA_PACKET_SIZE 960
+#define SSP_HEADER_BUFFER_SIZE 4
+
+enum {
+ SSP_KERNEL_BINARY = 0,
+ SSP_KERNEL_CRASHED_BINARY,
+};
+
+enum {
+ SSP_INITIALIZATION_STATE = 0,
+ SSP_NO_SENSOR_STATE,
+ SSP_ADD_SENSOR_STATE,
+ SSP_RUNNING_SENSOR_STATE,
+};
+
+/* Firmware download STATE */
+enum {
+ SSP_FW_DL_STATE_FAIL = -1,
+ SSP_FW_DL_STATE_NONE = 0,
+ SSP_FW_DL_STATE_NEED_TO_SCHEDULE,
+ SSP_FW_DL_STATE_SCHEDULED,
+ SSP_FW_DL_STATE_DOWNLOADING,
+ SSP_FW_DL_STATE_SYNC,
+ SSP_FW_DL_STATE_DONE,
+};
+
+#define SSP_INVALID_REVISION 99999
+#define SSP_INVALID_REVISION2 0xffffff
+
+/* AP -> SSP Instruction */
+#define SSP_MSG2SSP_INST_BYPASS_SENSOR_ADD 0xa1
+#define SSP_MSG2SSP_INST_BYPASS_SENSOR_RM 0xa2
+#define SSP_MSG2SSP_INST_REMOVE_ALL 0xa3
+#define SSP_MSG2SSP_INST_CHANGE_DELAY 0xa4
+#define SSP_MSG2SSP_INST_LIBRARY_ADD 0xb1
+#define SSP_MSG2SSP_INST_LIBRARY_REMOVE 0xb2
+#define SSP_MSG2SSP_INST_LIB_NOTI 0xb4
+#define SSP_MSG2SSP_INST_LIB_DATA 0xc1
+
+#define SSP_MSG2SSP_AP_MCU_SET_GYRO_CAL 0xcd
+#define SSP_MSG2SSP_AP_MCU_SET_ACCEL_CAL 0xce
+#define SSP_MSG2SSP_AP_STATUS_SHUTDOWN 0xd0
+#define SSP_MSG2SSP_AP_STATUS_WAKEUP 0xd1
+#define SSP_MSG2SSP_AP_STATUS_SLEEP 0xd2
+#define SSP_MSG2SSP_AP_STATUS_RESUME 0xd3
+#define SSP_MSG2SSP_AP_STATUS_SUSPEND 0xd4
+#define SSP_MSG2SSP_AP_STATUS_RESET 0xd5
+#define SSP_MSG2SSP_AP_STATUS_POW_CONNECTED 0xd6
+#define SSP_MSG2SSP_AP_STATUS_POW_DISCONNECTED 0xd7
+#define SSP_MSG2SSP_AP_TEMPHUMIDITY_CAL_DONE 0xda
+#define SSP_MSG2SSP_AP_MCU_SET_DUMPMODE 0xdb
+#define SSP_MSG2SSP_AP_MCU_DUMP_CHECK 0xdc
+#define SSP_MSG2SSP_AP_MCU_BATCH_FLUSH 0xdd
+#define SSP_MSG2SSP_AP_MCU_BATCH_COUNT 0xdf
+
+#define SSP_MSG2SSP_AP_WHOAMI 0x0f
+#define SSP_MSG2SSP_AP_FIRMWARE_REV 0xf0
+#define SSP_MSG2SSP_AP_SENSOR_FORMATION 0xf1
+#define SSP_MSG2SSP_AP_SENSOR_PROXTHRESHOLD 0xf2
+#define SSP_MSG2SSP_AP_SENSOR_BARCODE_EMUL 0xf3
+#define SSP_MSG2SSP_AP_SENSOR_SCANNING 0xf4
+#define SSP_MSG2SSP_AP_SET_MAGNETIC_HWOFFSET 0xf5
+#define SSP_MSG2SSP_AP_GET_MAGNETIC_HWOFFSET 0xf6
+#define SSP_MSG2SSP_AP_SENSOR_GESTURE_CURRENT 0xf7
+#define SSP_MSG2SSP_AP_GET_THERM 0xf8
+#define SSP_MSG2SSP_AP_GET_BIG_DATA 0xf9
+#define SSP_MSG2SSP_AP_SET_BIG_DATA 0xfa
+#define SSP_MSG2SSP_AP_START_BIG_DATA 0xfb
+#define SSP_MSG2SSP_AP_SET_MAGNETIC_STATIC_MATRIX 0xfd
+#define SSP_MSG2SSP_AP_SENSOR_TILT 0xea
+#define SSP_MSG2SSP_AP_MCU_SET_TIME 0xfe
+#define SSP_MSG2SSP_AP_MCU_GET_TIME 0xff
+
+#define SSP_MSG2SSP_AP_FUSEROM 0x01
+
+/* voice data */
+#define SSP_TYPE_WAKE_UP_VOICE_SERVICE 0x01
+#define SSP_TYPE_WAKE_UP_VOICE_SOUND_SOURCE_AM 0x01
+#define SSP_TYPE_WAKE_UP_VOICE_SOUND_SOURCE_GRAMMER 0x02
+
+/* Factory Test */
+#define SSP_ACCELEROMETER_FACTORY 0x80
+#define SSP_GYROSCOPE_FACTORY 0x81
+#define SSP_GEOMAGNETIC_FACTORY 0x82
+#define SSP_PRESSURE_FACTORY 0x85
+#define SSP_GESTURE_FACTORY 0x86
+#define SSP_TEMPHUMIDITY_CRC_FACTORY 0x88
+#define SSP_GYROSCOPE_TEMP_FACTORY 0x8a
+#define SSP_GYROSCOPE_DPS_FACTORY 0x8b
+#define SSP_MCU_FACTORY 0x8c
+#define SSP_MCU_SLEEP_FACTORY 0x8d
+
+/* SSP -> AP ACK about write CMD */
+#define SSP_MSG_ACK 0x80 /* ACK from SSP to AP */
+#define SSP_MSG_NAK 0x70 /* NAK from SSP to AP */
+
+struct ssp_sensorhub_info {
+ char *fw_name;
+ char *fw_crashed_name;
+ unsigned int fw_rev;
+ const u8 * const mag_table;
+ const unsigned int mag_length;
+};
+
+/* ssp_msg options bit */
+#define SSP_RW 0
+#define SSP_INDEX 3
+
+#define SSP_AP2HUB_READ 0
+#define SSP_AP2HUB_WRITE 1
+#define SSP_HUB2AP_WRITE 2
+#define SSP_AP2HUB_READY 3
+#define SSP_AP2HUB_RETURN 4
+
+/**
+ * struct ssp_data - ssp platformdata structure
+ * @spi: spi device
+ * @sensorhub_info: info about sensorhub board specific features
+ * @wdt_timer: watchdog timer
+ * @work_wdt: watchdog work
+ * @work_firmware: firmware upgrade work queue
+ * @work_refresh: refresh work queue for reset request from MCU
+ * @shut_down: shut down flag
+ * @mcu_dump_mode: mcu dump mode for debug
+ * @time_syncing: time syncing indication flag
+ * @timestamp: previous time in ns calculated for time syncing
+ * @check_status: status table for each sensor
+ * @com_fail_cnt: communication fail count
+ * @reset_cnt: reset count
+ * @timeout_cnt: timeout count
+ * @available_sensors: available sensors seen by sensorhub (bit array)
+ * @cur_firm_rev: cached current firmware revision
+ * @last_resume_state: last AP resume/suspend state used to handle the PM
+ * state of ssp
+ * @last_ap_state: (obsolete) sleep notification for MCU
+ * @sensor_enable: sensor enable mask
+ * @delay_buf: data acquisition intervals table
+ * @batch_latency_buf: yet unknown but existing in communication protocol
+ * @batch_opt_buf: yet unknown but existing in communication protocol
+ * @accel_position: yet unknown but existing in communication protocol
+ * @mag_position: yet unknown but existing in communication protocol
+ * @fw_dl_state: firmware download state
+ * @comm_lock: lock protecting the handshake
+ * @pending_lock: lock protecting pending list and completion
+ * @mcu_reset_gpiod: mcu reset line
+ * @ap_mcu_gpiod: ap to mcu gpio line
+ * @mcu_ap_gpiod: mcu to ap gpio line
+ * @pending_list: pending list for messages queued to be sent/read
+ * @sensor_devs: registered IIO devices table
+ * @enable_refcount: enable reference count for wdt (watchdog timer)
+ * @header_buffer: cache aligned buffer for packet header
+ */
+struct ssp_data {
+ struct spi_device *spi;
+ const struct ssp_sensorhub_info *sensorhub_info;
+ struct timer_list wdt_timer;
+ struct work_struct work_wdt;
+ struct delayed_work work_refresh;
+
+ bool shut_down;
+ bool mcu_dump_mode;
+ bool time_syncing;
+ int64_t timestamp;
+
+ int check_status[SSP_SENSOR_MAX];
+
+ unsigned int com_fail_cnt;
+ unsigned int reset_cnt;
+ unsigned int timeout_cnt;
+
+ unsigned int available_sensors;
+ unsigned int cur_firm_rev;
+
+ char last_resume_state;
+ char last_ap_state;
+
+ unsigned int sensor_enable;
+ u32 delay_buf[SSP_SENSOR_MAX];
+ s32 batch_latency_buf[SSP_SENSOR_MAX];
+ s8 batch_opt_buf[SSP_SENSOR_MAX];
+
+ int accel_position;
+ int mag_position;
+ int fw_dl_state;
+
+ struct mutex comm_lock;
+ struct mutex pending_lock;
+
+ struct gpio_desc *mcu_reset_gpiod;
+ struct gpio_desc *ap_mcu_gpiod;
+ struct gpio_desc *mcu_ap_gpiod;
+
+ struct list_head pending_list;
+
+ struct iio_dev *sensor_devs[SSP_SENSOR_MAX];
+ atomic_t enable_refcount;
+
+ __le16 header_buffer[SSP_HEADER_BUFFER_SIZE / sizeof(__le16)] __aligned(IIO_DMA_MINALIGN);
+};
+
+void ssp_clean_pending_list(struct ssp_data *data);
+
+int ssp_command(struct ssp_data *data, char command, int arg);
+
+int ssp_send_instruction(struct ssp_data *data, u8 inst, u8 sensor_type,
+ u8 *send_buf, u8 length);
+
+int ssp_irq_msg(struct ssp_data *data);
+
+int ssp_get_chipid(struct ssp_data *data);
+
+int ssp_set_magnetic_matrix(struct ssp_data *data);
+
+unsigned int ssp_get_sensor_scanning_info(struct ssp_data *data);
+
+unsigned int ssp_get_firmware_rev(struct ssp_data *data);
+
+int ssp_queue_ssp_refresh_task(struct ssp_data *data, unsigned int delay);
+
+#endif /* __SSP_SENSORHUB_H__ */
diff --git a/drivers/iio/common/ssp_sensors/ssp_dev.c b/drivers/iio/common/ssp_sensors/ssp_dev.c
new file mode 100644
index 0000000000..e64d242145
--- /dev/null
+++ b/drivers/iio/common/ssp_sensors/ssp_dev.c
@@ -0,0 +1,666 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2014, Samsung Electronics Co. Ltd. All Rights Reserved.
+ */
+
+#include <linux/iio/iio.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/mfd/core.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/property.h>
+
+#include "ssp.h"
+
+#define SSP_WDT_TIME 10000
+#define SSP_LIMIT_RESET_CNT 20
+#define SSP_LIMIT_TIMEOUT_CNT 3
+
+/* It is possible that it is max clk rate for version 1.0 of bootcode */
+#define SSP_BOOT_SPI_HZ 400000
+
+/*
+ * These fields can look enigmatic but this structure is used mainly to flat
+ * some values and depends on command type.
+ */
+struct ssp_instruction {
+ __le32 a;
+ __le32 b;
+ u8 c;
+} __attribute__((__packed__));
+
+static const u8 ssp_magnitude_table[] = {110, 85, 171, 71, 203, 195, 0, 67,
+ 208, 56, 175, 244, 206, 213, 0, 92, 250, 0, 55, 48, 189, 252, 171,
+ 243, 13, 45, 250};
+
+static const struct ssp_sensorhub_info ssp_rinato_info = {
+ .fw_name = "ssp_B2.fw",
+ .fw_crashed_name = "ssp_crashed.fw",
+ .fw_rev = 14052300,
+ .mag_table = ssp_magnitude_table,
+ .mag_length = ARRAY_SIZE(ssp_magnitude_table),
+};
+
+static const struct ssp_sensorhub_info ssp_thermostat_info = {
+ .fw_name = "thermostat_B2.fw",
+ .fw_crashed_name = "ssp_crashed.fw",
+ .fw_rev = 14080600,
+ .mag_table = ssp_magnitude_table,
+ .mag_length = ARRAY_SIZE(ssp_magnitude_table),
+};
+
+static const struct mfd_cell sensorhub_sensor_devs[] = {
+ {
+ .name = "ssp-accelerometer",
+ },
+ {
+ .name = "ssp-gyroscope",
+ },
+};
+
+static void ssp_toggle_mcu_reset_gpio(struct ssp_data *data)
+{
+ gpiod_set_value(data->mcu_reset_gpiod, 0);
+ usleep_range(1000, 1200);
+ gpiod_set_value(data->mcu_reset_gpiod, 1);
+ msleep(50);
+}
+
+static void ssp_sync_available_sensors(struct ssp_data *data)
+{
+ int i, ret;
+
+ for (i = 0; i < SSP_SENSOR_MAX; ++i) {
+ if (data->available_sensors & BIT(i)) {
+ ret = ssp_enable_sensor(data, i, data->delay_buf[i]);
+ if (ret < 0) {
+ dev_err(&data->spi->dev,
+ "Sync sensor nr: %d fail\n", i);
+ continue;
+ }
+ }
+ }
+
+ ret = ssp_command(data, SSP_MSG2SSP_AP_MCU_SET_DUMPMODE,
+ data->mcu_dump_mode);
+ if (ret < 0)
+ dev_err(&data->spi->dev,
+ "SSP_MSG2SSP_AP_MCU_SET_DUMPMODE failed\n");
+}
+
+static void ssp_enable_mcu(struct ssp_data *data, bool enable)
+{
+ dev_info(&data->spi->dev, "current shutdown = %d, old = %d\n", enable,
+ data->shut_down);
+
+ if (enable && data->shut_down) {
+ data->shut_down = false;
+ enable_irq(data->spi->irq);
+ enable_irq_wake(data->spi->irq);
+ } else if (!enable && !data->shut_down) {
+ data->shut_down = true;
+ disable_irq(data->spi->irq);
+ disable_irq_wake(data->spi->irq);
+ } else {
+ dev_warn(&data->spi->dev, "current shutdown = %d, old = %d\n",
+ enable, data->shut_down);
+ }
+}
+
+/*
+ * This function is the first one which communicates with the mcu so it is
+ * possible that the first attempt will fail
+ */
+static int ssp_check_fwbl(struct ssp_data *data)
+{
+ int retries = 0;
+
+ while (retries++ < 5) {
+ data->cur_firm_rev = ssp_get_firmware_rev(data);
+ if (data->cur_firm_rev == SSP_INVALID_REVISION ||
+ data->cur_firm_rev == SSP_INVALID_REVISION2) {
+ dev_warn(&data->spi->dev,
+ "Invalid revision, trying %d time\n", retries);
+ } else {
+ break;
+ }
+ }
+
+ if (data->cur_firm_rev == SSP_INVALID_REVISION ||
+ data->cur_firm_rev == SSP_INVALID_REVISION2) {
+ dev_err(&data->spi->dev, "SSP_INVALID_REVISION\n");
+ return SSP_FW_DL_STATE_NEED_TO_SCHEDULE;
+ }
+
+ dev_info(&data->spi->dev,
+ "MCU Firm Rev : Old = %8u, New = %8u\n",
+ data->cur_firm_rev,
+ data->sensorhub_info->fw_rev);
+
+ if (data->cur_firm_rev != data->sensorhub_info->fw_rev)
+ return SSP_FW_DL_STATE_NEED_TO_SCHEDULE;
+
+ return SSP_FW_DL_STATE_NONE;
+}
+
+static void ssp_reset_mcu(struct ssp_data *data)
+{
+ ssp_enable_mcu(data, false);
+ ssp_clean_pending_list(data);
+ ssp_toggle_mcu_reset_gpio(data);
+ ssp_enable_mcu(data, true);
+}
+
+static void ssp_wdt_work_func(struct work_struct *work)
+{
+ struct ssp_data *data = container_of(work, struct ssp_data, work_wdt);
+
+ dev_err(&data->spi->dev, "%s - Sensor state: 0x%x, RC: %u, CC: %u\n",
+ __func__, data->available_sensors, data->reset_cnt,
+ data->com_fail_cnt);
+
+ ssp_reset_mcu(data);
+ data->com_fail_cnt = 0;
+ data->timeout_cnt = 0;
+}
+
+static void ssp_wdt_timer_func(struct timer_list *t)
+{
+ struct ssp_data *data = from_timer(data, t, wdt_timer);
+
+ switch (data->fw_dl_state) {
+ case SSP_FW_DL_STATE_FAIL:
+ case SSP_FW_DL_STATE_DOWNLOADING:
+ case SSP_FW_DL_STATE_SYNC:
+ goto _mod;
+ }
+
+ if (data->timeout_cnt > SSP_LIMIT_TIMEOUT_CNT ||
+ data->com_fail_cnt > SSP_LIMIT_RESET_CNT)
+ queue_work(system_power_efficient_wq, &data->work_wdt);
+_mod:
+ mod_timer(&data->wdt_timer, jiffies + msecs_to_jiffies(SSP_WDT_TIME));
+}
+
+static void ssp_enable_wdt_timer(struct ssp_data *data)
+{
+ mod_timer(&data->wdt_timer, jiffies + msecs_to_jiffies(SSP_WDT_TIME));
+}
+
+static void ssp_disable_wdt_timer(struct ssp_data *data)
+{
+ del_timer_sync(&data->wdt_timer);
+ cancel_work_sync(&data->work_wdt);
+}
+
+/**
+ * ssp_get_sensor_delay() - gets sensor data acquisition period
+ * @data: sensorhub structure
+ * @type: SSP sensor type
+ *
+ * Returns acquisition period in ms
+ */
+u32 ssp_get_sensor_delay(struct ssp_data *data, enum ssp_sensor_type type)
+{
+ return data->delay_buf[type];
+}
+EXPORT_SYMBOL_NS(ssp_get_sensor_delay, IIO_SSP_SENSORS);
+
+/**
+ * ssp_enable_sensor() - enables data acquisition for sensor
+ * @data: sensorhub structure
+ * @type: SSP sensor type
+ * @delay: delay in ms
+ *
+ * Returns 0 or negative value in case of error
+ */
+int ssp_enable_sensor(struct ssp_data *data, enum ssp_sensor_type type,
+ u32 delay)
+{
+ int ret;
+ struct ssp_instruction to_send;
+
+ to_send.a = cpu_to_le32(delay);
+ to_send.b = cpu_to_le32(data->batch_latency_buf[type]);
+ to_send.c = data->batch_opt_buf[type];
+
+ switch (data->check_status[type]) {
+ case SSP_INITIALIZATION_STATE:
+ /* do calibration step, now just enable */
+ case SSP_ADD_SENSOR_STATE:
+ ret = ssp_send_instruction(data,
+ SSP_MSG2SSP_INST_BYPASS_SENSOR_ADD,
+ type,
+ (u8 *)&to_send, sizeof(to_send));
+ if (ret < 0) {
+ dev_err(&data->spi->dev, "Enabling sensor failed\n");
+ data->check_status[type] = SSP_NO_SENSOR_STATE;
+ goto derror;
+ }
+
+ data->sensor_enable |= BIT(type);
+ data->check_status[type] = SSP_RUNNING_SENSOR_STATE;
+ break;
+ case SSP_RUNNING_SENSOR_STATE:
+ ret = ssp_send_instruction(data,
+ SSP_MSG2SSP_INST_CHANGE_DELAY, type,
+ (u8 *)&to_send, sizeof(to_send));
+ if (ret < 0) {
+ dev_err(&data->spi->dev,
+ "Changing sensor delay failed\n");
+ goto derror;
+ }
+ break;
+ default:
+ data->check_status[type] = SSP_ADD_SENSOR_STATE;
+ break;
+ }
+
+ data->delay_buf[type] = delay;
+
+ if (atomic_inc_return(&data->enable_refcount) == 1)
+ ssp_enable_wdt_timer(data);
+
+ return 0;
+
+derror:
+ return ret;
+}
+EXPORT_SYMBOL_NS(ssp_enable_sensor, IIO_SSP_SENSORS);
+
+/**
+ * ssp_change_delay() - changes data acquisition for sensor
+ * @data: sensorhub structure
+ * @type: SSP sensor type
+ * @delay: delay in ms
+ *
+ * Returns 0 or negative value in case of error
+ */
+int ssp_change_delay(struct ssp_data *data, enum ssp_sensor_type type,
+ u32 delay)
+{
+ int ret;
+ struct ssp_instruction to_send;
+
+ to_send.a = cpu_to_le32(delay);
+ to_send.b = cpu_to_le32(data->batch_latency_buf[type]);
+ to_send.c = data->batch_opt_buf[type];
+
+ ret = ssp_send_instruction(data, SSP_MSG2SSP_INST_CHANGE_DELAY, type,
+ (u8 *)&to_send, sizeof(to_send));
+ if (ret < 0) {
+ dev_err(&data->spi->dev, "Changing sensor delay failed\n");
+ return ret;
+ }
+
+ data->delay_buf[type] = delay;
+
+ return 0;
+}
+EXPORT_SYMBOL_NS(ssp_change_delay, IIO_SSP_SENSORS);
+
+/**
+ * ssp_disable_sensor() - disables sensor
+ *
+ * @data: sensorhub structure
+ * @type: SSP sensor type
+ *
+ * Returns 0 or negative value in case of error
+ */
+int ssp_disable_sensor(struct ssp_data *data, enum ssp_sensor_type type)
+{
+ int ret;
+ __le32 command;
+
+ if (data->sensor_enable & BIT(type)) {
+ command = cpu_to_le32(data->delay_buf[type]);
+
+ ret = ssp_send_instruction(data,
+ SSP_MSG2SSP_INST_BYPASS_SENSOR_RM,
+ type, (u8 *)&command,
+ sizeof(command));
+ if (ret < 0) {
+ dev_err(&data->spi->dev, "Remove sensor fail\n");
+ return ret;
+ }
+
+ data->sensor_enable &= ~BIT(type);
+ }
+
+ data->check_status[type] = SSP_ADD_SENSOR_STATE;
+
+ if (atomic_dec_and_test(&data->enable_refcount))
+ ssp_disable_wdt_timer(data);
+
+ return 0;
+}
+EXPORT_SYMBOL_NS(ssp_disable_sensor, IIO_SSP_SENSORS);
+
+static irqreturn_t ssp_irq_thread_fn(int irq, void *dev_id)
+{
+ struct ssp_data *data = dev_id;
+
+ /*
+ * This wrapper is done to preserve error path for ssp_irq_msg, also
+ * it is defined in different file.
+ */
+ ssp_irq_msg(data);
+
+ return IRQ_HANDLED;
+}
+
+static int ssp_initialize_mcu(struct ssp_data *data)
+{
+ int ret;
+
+ ssp_clean_pending_list(data);
+
+ ret = ssp_get_chipid(data);
+ if (ret != SSP_DEVICE_ID) {
+ dev_err(&data->spi->dev, "%s - MCU %s ret = %d\n", __func__,
+ ret < 0 ? "is not working" : "identification failed",
+ ret);
+ return ret < 0 ? ret : -ENODEV;
+ }
+
+ dev_info(&data->spi->dev, "MCU device ID = %d\n", ret);
+
+ /*
+ * needs clarification, for now do not want to export all transfer
+ * methods to sensors' drivers
+ */
+ ret = ssp_set_magnetic_matrix(data);
+ if (ret < 0) {
+ dev_err(&data->spi->dev,
+ "%s - ssp_set_magnetic_matrix failed\n", __func__);
+ return ret;
+ }
+
+ data->available_sensors = ssp_get_sensor_scanning_info(data);
+ if (data->available_sensors == 0) {
+ dev_err(&data->spi->dev,
+ "%s - ssp_get_sensor_scanning_info failed\n", __func__);
+ return -EIO;
+ }
+
+ data->cur_firm_rev = ssp_get_firmware_rev(data);
+ dev_info(&data->spi->dev, "MCU Firm Rev : New = %8u\n",
+ data->cur_firm_rev);
+
+ return ssp_command(data, SSP_MSG2SSP_AP_MCU_DUMP_CHECK, 0);
+}
+
+/*
+ * sensorhub can request its reinitialization as some brutal and rare error
+ * handling. It can be requested from the MCU.
+ */
+static void ssp_refresh_task(struct work_struct *work)
+{
+ struct ssp_data *data = container_of((struct delayed_work *)work,
+ struct ssp_data, work_refresh);
+
+ dev_info(&data->spi->dev, "refreshing\n");
+
+ data->reset_cnt++;
+
+ if (ssp_initialize_mcu(data) >= 0) {
+ ssp_sync_available_sensors(data);
+ if (data->last_ap_state != 0)
+ ssp_command(data, data->last_ap_state, 0);
+
+ if (data->last_resume_state != 0)
+ ssp_command(data, data->last_resume_state, 0);
+
+ data->timeout_cnt = 0;
+ data->com_fail_cnt = 0;
+ }
+}
+
+int ssp_queue_ssp_refresh_task(struct ssp_data *data, unsigned int delay)
+{
+ cancel_delayed_work_sync(&data->work_refresh);
+
+ return queue_delayed_work(system_power_efficient_wq,
+ &data->work_refresh,
+ msecs_to_jiffies(delay));
+}
+
+static const struct of_device_id ssp_of_match[] = {
+ {
+ .compatible = "samsung,sensorhub-rinato",
+ .data = &ssp_rinato_info,
+ }, {
+ .compatible = "samsung,sensorhub-thermostat",
+ .data = &ssp_thermostat_info,
+ },
+ {},
+};
+MODULE_DEVICE_TABLE(of, ssp_of_match);
+
+static struct ssp_data *ssp_parse_dt(struct device *dev)
+{
+ struct ssp_data *data;
+
+ data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return NULL;
+
+ data->mcu_ap_gpiod = devm_gpiod_get(dev, "mcu-ap", GPIOD_IN);
+ if (IS_ERR(data->mcu_ap_gpiod))
+ return NULL;
+
+ data->ap_mcu_gpiod = devm_gpiod_get(dev, "ap-mcu", GPIOD_OUT_HIGH);
+ if (IS_ERR(data->ap_mcu_gpiod))
+ return NULL;
+
+ data->mcu_reset_gpiod = devm_gpiod_get(dev, "mcu-reset",
+ GPIOD_OUT_HIGH);
+ if (IS_ERR(data->mcu_reset_gpiod))
+ return NULL;
+
+ data->sensorhub_info = device_get_match_data(dev);
+
+ dev_set_drvdata(dev, data);
+
+ return data;
+}
+
+/**
+ * ssp_register_consumer() - registers iio consumer in ssp framework
+ *
+ * @indio_dev: consumer iio device
+ * @type: ssp sensor type
+ */
+void ssp_register_consumer(struct iio_dev *indio_dev, enum ssp_sensor_type type)
+{
+ struct ssp_data *data = dev_get_drvdata(indio_dev->dev.parent->parent);
+
+ data->sensor_devs[type] = indio_dev;
+}
+EXPORT_SYMBOL_NS(ssp_register_consumer, IIO_SSP_SENSORS);
+
+static int ssp_probe(struct spi_device *spi)
+{
+ int ret, i;
+ struct ssp_data *data;
+
+ data = ssp_parse_dt(&spi->dev);
+ if (!data) {
+ dev_err(&spi->dev, "Failed to find platform data\n");
+ return -ENODEV;
+ }
+
+ ret = mfd_add_devices(&spi->dev, PLATFORM_DEVID_NONE,
+ sensorhub_sensor_devs,
+ ARRAY_SIZE(sensorhub_sensor_devs), NULL, 0, NULL);
+ if (ret < 0) {
+ dev_err(&spi->dev, "mfd add devices fail\n");
+ return ret;
+ }
+
+ spi->mode = SPI_MODE_1;
+ ret = spi_setup(spi);
+ if (ret < 0) {
+ dev_err(&spi->dev, "Failed to setup spi\n");
+ return ret;
+ }
+
+ data->fw_dl_state = SSP_FW_DL_STATE_NONE;
+ data->spi = spi;
+ spi_set_drvdata(spi, data);
+
+ mutex_init(&data->comm_lock);
+
+ for (i = 0; i < SSP_SENSOR_MAX; ++i) {
+ data->delay_buf[i] = SSP_DEFAULT_POLLING_DELAY;
+ data->batch_latency_buf[i] = 0;
+ data->batch_opt_buf[i] = 0;
+ data->check_status[i] = SSP_INITIALIZATION_STATE;
+ }
+
+ data->delay_buf[SSP_BIO_HRM_LIB] = 100;
+
+ data->time_syncing = true;
+
+ mutex_init(&data->pending_lock);
+ INIT_LIST_HEAD(&data->pending_list);
+
+ atomic_set(&data->enable_refcount, 0);
+
+ INIT_WORK(&data->work_wdt, ssp_wdt_work_func);
+ INIT_DELAYED_WORK(&data->work_refresh, ssp_refresh_task);
+
+ timer_setup(&data->wdt_timer, ssp_wdt_timer_func, 0);
+
+ ret = request_threaded_irq(data->spi->irq, NULL,
+ ssp_irq_thread_fn,
+ IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+ "SSP_Int", data);
+ if (ret < 0) {
+ dev_err(&spi->dev, "Irq request fail\n");
+ goto err_setup_irq;
+ }
+
+ /* Let's start with enabled one so irq balance could be ok */
+ data->shut_down = false;
+
+ /* just to avoid unbalanced irq set wake up */
+ enable_irq_wake(data->spi->irq);
+
+ data->fw_dl_state = ssp_check_fwbl(data);
+ if (data->fw_dl_state == SSP_FW_DL_STATE_NONE) {
+ ret = ssp_initialize_mcu(data);
+ if (ret < 0) {
+ dev_err(&spi->dev, "Initialize_mcu failed\n");
+ goto err_read_reg;
+ }
+ } else {
+ dev_err(&spi->dev, "Firmware version not supported\n");
+ ret = -EPERM;
+ goto err_read_reg;
+ }
+
+ return 0;
+
+err_read_reg:
+ free_irq(data->spi->irq, data);
+err_setup_irq:
+ mutex_destroy(&data->pending_lock);
+ mutex_destroy(&data->comm_lock);
+
+ dev_err(&spi->dev, "Probe failed!\n");
+
+ return ret;
+}
+
+static void ssp_remove(struct spi_device *spi)
+{
+ struct ssp_data *data = spi_get_drvdata(spi);
+
+ if (ssp_command(data, SSP_MSG2SSP_AP_STATUS_SHUTDOWN, 0) < 0)
+ dev_err(&data->spi->dev,
+ "SSP_MSG2SSP_AP_STATUS_SHUTDOWN failed\n");
+
+ ssp_enable_mcu(data, false);
+ ssp_disable_wdt_timer(data);
+
+ ssp_clean_pending_list(data);
+
+ free_irq(data->spi->irq, data);
+
+ del_timer_sync(&data->wdt_timer);
+ cancel_work_sync(&data->work_wdt);
+
+ mutex_destroy(&data->comm_lock);
+ mutex_destroy(&data->pending_lock);
+
+ mfd_remove_devices(&spi->dev);
+}
+
+static int ssp_suspend(struct device *dev)
+{
+ int ret;
+ struct ssp_data *data = spi_get_drvdata(to_spi_device(dev));
+
+ data->last_resume_state = SSP_MSG2SSP_AP_STATUS_SUSPEND;
+
+ if (atomic_read(&data->enable_refcount) > 0)
+ ssp_disable_wdt_timer(data);
+
+ ret = ssp_command(data, SSP_MSG2SSP_AP_STATUS_SUSPEND, 0);
+ if (ret < 0) {
+ dev_err(&data->spi->dev,
+ "%s SSP_MSG2SSP_AP_STATUS_SUSPEND failed\n", __func__);
+
+ ssp_enable_wdt_timer(data);
+ return ret;
+ }
+
+ data->time_syncing = false;
+ disable_irq(data->spi->irq);
+
+ return 0;
+}
+
+static int ssp_resume(struct device *dev)
+{
+ int ret;
+ struct ssp_data *data = spi_get_drvdata(to_spi_device(dev));
+
+ enable_irq(data->spi->irq);
+
+ if (atomic_read(&data->enable_refcount) > 0)
+ ssp_enable_wdt_timer(data);
+
+ ret = ssp_command(data, SSP_MSG2SSP_AP_STATUS_RESUME, 0);
+ if (ret < 0) {
+ dev_err(&data->spi->dev,
+ "%s SSP_MSG2SSP_AP_STATUS_RESUME failed\n", __func__);
+ ssp_disable_wdt_timer(data);
+ return ret;
+ }
+
+ /* timesyncing is set by MCU */
+ data->last_resume_state = SSP_MSG2SSP_AP_STATUS_RESUME;
+
+ return 0;
+}
+
+static DEFINE_SIMPLE_DEV_PM_OPS(ssp_pm_ops, ssp_suspend, ssp_resume);
+
+static struct spi_driver ssp_driver = {
+ .probe = ssp_probe,
+ .remove = ssp_remove,
+ .driver = {
+ .pm = pm_sleep_ptr(&ssp_pm_ops),
+ .of_match_table = ssp_of_match,
+ .name = "sensorhub"
+ },
+};
+
+module_spi_driver(ssp_driver);
+
+MODULE_DESCRIPTION("ssp sensorhub driver");
+MODULE_AUTHOR("Samsung Electronics");
+MODULE_LICENSE("GPL");
diff --git a/drivers/iio/common/ssp_sensors/ssp_iio.c b/drivers/iio/common/ssp_sensors/ssp_iio.c
new file mode 100644
index 0000000000..88b8b56bfa
--- /dev/null
+++ b/drivers/iio/common/ssp_sensors/ssp_iio.c
@@ -0,0 +1,99 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2014, Samsung Electronics Co. Ltd. All Rights Reserved.
+ */
+
+#include <linux/iio/common/ssp_sensors.h>
+#include <linux/iio/buffer.h>
+#include <linux/iio/kfifo_buf.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include "ssp_iio_sensor.h"
+
+/**
+ * ssp_common_buffer_postenable() - generic postenable callback for ssp buffer
+ *
+ * @indio_dev: iio device
+ *
+ * Returns 0 or negative value in case of error
+ */
+int ssp_common_buffer_postenable(struct iio_dev *indio_dev)
+{
+ struct ssp_sensor_data *spd = iio_priv(indio_dev);
+ struct ssp_data *data = dev_get_drvdata(indio_dev->dev.parent->parent);
+
+ /* the allocation is made in post because scan size is known in this
+ * moment
+ * */
+ spd->buffer = kmalloc(indio_dev->scan_bytes, GFP_KERNEL | GFP_DMA);
+ if (!spd->buffer)
+ return -ENOMEM;
+
+ return ssp_enable_sensor(data, spd->type,
+ ssp_get_sensor_delay(data, spd->type));
+}
+EXPORT_SYMBOL_NS(ssp_common_buffer_postenable, IIO_SSP_SENSORS);
+
+/**
+ * ssp_common_buffer_postdisable() - generic postdisable callback for ssp buffer
+ *
+ * @indio_dev: iio device
+ *
+ * Returns 0 or negative value in case of error
+ */
+int ssp_common_buffer_postdisable(struct iio_dev *indio_dev)
+{
+ int ret;
+ struct ssp_sensor_data *spd = iio_priv(indio_dev);
+ struct ssp_data *data = dev_get_drvdata(indio_dev->dev.parent->parent);
+
+ ret = ssp_disable_sensor(data, spd->type);
+ if (ret < 0)
+ return ret;
+
+ kfree(spd->buffer);
+
+ return ret;
+}
+EXPORT_SYMBOL_NS(ssp_common_buffer_postdisable, IIO_SSP_SENSORS);
+
+/**
+ * ssp_common_process_data() - Common process data callback for ssp sensors
+ *
+ * @indio_dev: iio device
+ * @buf: source buffer
+ * @len: sensor data length
+ * @timestamp: system timestamp
+ *
+ * Returns 0 or negative value in case of error
+ */
+int ssp_common_process_data(struct iio_dev *indio_dev, void *buf,
+ unsigned int len, int64_t timestamp)
+{
+ __le32 time;
+ int64_t calculated_time = 0;
+ struct ssp_sensor_data *spd = iio_priv(indio_dev);
+
+ if (indio_dev->scan_bytes == 0)
+ return 0;
+
+ /*
+ * it always sends full set of samples, remember about available masks
+ */
+ memcpy(spd->buffer, buf, len);
+
+ if (indio_dev->scan_timestamp) {
+ memcpy(&time, &((char *)buf)[len], SSP_TIME_SIZE);
+ calculated_time =
+ timestamp + (int64_t)le32_to_cpu(time) * 1000000;
+ }
+
+ return iio_push_to_buffers_with_timestamp(indio_dev, spd->buffer,
+ calculated_time);
+}
+EXPORT_SYMBOL_NS(ssp_common_process_data, IIO_SSP_SENSORS);
+
+MODULE_AUTHOR("Karol Wrona <k.wrona@samsung.com>");
+MODULE_DESCRIPTION("Samsung sensorhub commons");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS(IIO_SSP_SENSORS);
diff --git a/drivers/iio/common/ssp_sensors/ssp_iio_sensor.h b/drivers/iio/common/ssp_sensors/ssp_iio_sensor.h
new file mode 100644
index 0000000000..4528ab55eb
--- /dev/null
+++ b/drivers/iio/common/ssp_sensors/ssp_iio_sensor.h
@@ -0,0 +1,72 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __SSP_IIO_SENSOR_H__
+#define __SSP_IIO_SENSOR_H__
+
+#define SSP_CHANNEL_AG(_type, _mod, _index) \
+{ \
+ .type = _type,\
+ .modified = 1,\
+ .channel2 = _mod,\
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ),\
+ .scan_index = _index,\
+ .scan_type = {\
+ .sign = 's',\
+ .realbits = 16,\
+ .storagebits = 16,\
+ .shift = 0,\
+ .endianness = IIO_LE,\
+ },\
+}
+
+/* It is defined here as it is a mixed timestamp */
+#define SSP_CHAN_TIMESTAMP(_si) { \
+ .type = IIO_TIMESTAMP, \
+ .channel = -1, \
+ .scan_index = _si, \
+ .scan_type = { \
+ .sign = 's', \
+ .realbits = 64, \
+ .storagebits = 64, \
+ }, \
+}
+
+#define SSP_MS_PER_S 1000
+#define SSP_INVERTED_SCALING_FACTOR 1000000U
+
+#define SSP_FACTOR_WITH_MS \
+ (SSP_INVERTED_SCALING_FACTOR * SSP_MS_PER_S)
+
+int ssp_common_buffer_postenable(struct iio_dev *indio_dev);
+
+int ssp_common_buffer_postdisable(struct iio_dev *indio_dev);
+
+int ssp_common_process_data(struct iio_dev *indio_dev, void *buf,
+ unsigned int len, int64_t timestamp);
+
+/* Converts time in ms to frequency */
+static inline void ssp_convert_to_freq(u32 time, int *integer_part,
+ int *fractional)
+{
+ if (time == 0) {
+ *fractional = 0;
+ *integer_part = 0;
+ return;
+ }
+
+ *integer_part = SSP_FACTOR_WITH_MS / time;
+ *fractional = *integer_part % SSP_INVERTED_SCALING_FACTOR;
+ *integer_part = *integer_part / SSP_INVERTED_SCALING_FACTOR;
+}
+
+/* Converts frequency to time in ms */
+static inline int ssp_convert_to_time(int integer_part, int fractional)
+{
+ u64 value;
+
+ value = (u64)integer_part * SSP_INVERTED_SCALING_FACTOR + fractional;
+ if (value == 0)
+ return 0;
+
+ return div64_u64((u64)SSP_FACTOR_WITH_MS, value);
+}
+#endif /* __SSP_IIO_SENSOR_H__ */
diff --git a/drivers/iio/common/ssp_sensors/ssp_spi.c b/drivers/iio/common/ssp_sensors/ssp_spi.c
new file mode 100644
index 0000000000..f32b04b63e
--- /dev/null
+++ b/drivers/iio/common/ssp_sensors/ssp_spi.c
@@ -0,0 +1,601 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2014, Samsung Electronics Co. Ltd. All Rights Reserved.
+ */
+
+#include "ssp.h"
+
+#define SSP_DEV (&data->spi->dev)
+#define SSP_GET_MESSAGE_TYPE(data) (data & (3 << SSP_RW))
+
+/*
+ * SSP -> AP Instruction
+ * They tell what packet type can be expected. In the future there will
+ * be less of them. BYPASS means common sensor packets with accel, gyro,
+ * hrm etc. data. LIBRARY and META are mock-up's for now.
+ */
+#define SSP_MSG2AP_INST_BYPASS_DATA 0x37
+#define SSP_MSG2AP_INST_LIBRARY_DATA 0x01
+#define SSP_MSG2AP_INST_DEBUG_DATA 0x03
+#define SSP_MSG2AP_INST_BIG_DATA 0x04
+#define SSP_MSG2AP_INST_META_DATA 0x05
+#define SSP_MSG2AP_INST_TIME_SYNC 0x06
+#define SSP_MSG2AP_INST_RESET 0x07
+
+#define SSP_UNIMPLEMENTED -1
+
+struct ssp_msg_header {
+ u8 cmd;
+ __le16 length;
+ __le16 options;
+ __le32 data;
+} __attribute__((__packed__));
+
+struct ssp_msg {
+ u16 length;
+ u16 options;
+ struct list_head list;
+ struct completion *done;
+ struct ssp_msg_header *h;
+ char *buffer;
+};
+
+static const int ssp_offset_map[SSP_SENSOR_MAX] = {
+ [SSP_ACCELEROMETER_SENSOR] = SSP_ACCELEROMETER_SIZE +
+ SSP_TIME_SIZE,
+ [SSP_GYROSCOPE_SENSOR] = SSP_GYROSCOPE_SIZE +
+ SSP_TIME_SIZE,
+ [SSP_GEOMAGNETIC_UNCALIB_SENSOR] = SSP_UNIMPLEMENTED,
+ [SSP_GEOMAGNETIC_RAW] = SSP_UNIMPLEMENTED,
+ [SSP_GEOMAGNETIC_SENSOR] = SSP_UNIMPLEMENTED,
+ [SSP_PRESSURE_SENSOR] = SSP_UNIMPLEMENTED,
+ [SSP_GESTURE_SENSOR] = SSP_UNIMPLEMENTED,
+ [SSP_PROXIMITY_SENSOR] = SSP_UNIMPLEMENTED,
+ [SSP_TEMPERATURE_HUMIDITY_SENSOR] = SSP_UNIMPLEMENTED,
+ [SSP_LIGHT_SENSOR] = SSP_UNIMPLEMENTED,
+ [SSP_PROXIMITY_RAW] = SSP_UNIMPLEMENTED,
+ [SSP_ORIENTATION_SENSOR] = SSP_UNIMPLEMENTED,
+ [SSP_STEP_DETECTOR] = SSP_UNIMPLEMENTED,
+ [SSP_SIG_MOTION_SENSOR] = SSP_UNIMPLEMENTED,
+ [SSP_GYRO_UNCALIB_SENSOR] = SSP_UNIMPLEMENTED,
+ [SSP_GAME_ROTATION_VECTOR] = SSP_UNIMPLEMENTED,
+ [SSP_ROTATION_VECTOR] = SSP_UNIMPLEMENTED,
+ [SSP_STEP_COUNTER] = SSP_UNIMPLEMENTED,
+ [SSP_BIO_HRM_RAW] = SSP_BIO_HRM_RAW_SIZE +
+ SSP_TIME_SIZE,
+ [SSP_BIO_HRM_RAW_FAC] = SSP_BIO_HRM_RAW_FAC_SIZE +
+ SSP_TIME_SIZE,
+ [SSP_BIO_HRM_LIB] = SSP_BIO_HRM_LIB_SIZE +
+ SSP_TIME_SIZE,
+};
+
+#define SSP_HEADER_SIZE (sizeof(struct ssp_msg_header))
+#define SSP_HEADER_SIZE_ALIGNED (ALIGN(SSP_HEADER_SIZE, 4))
+
+static struct ssp_msg *ssp_create_msg(u8 cmd, u16 len, u16 opt, u32 data)
+{
+ struct ssp_msg_header h;
+ struct ssp_msg *msg;
+
+ msg = kzalloc(sizeof(*msg), GFP_KERNEL);
+ if (!msg)
+ return NULL;
+
+ h.cmd = cmd;
+ h.length = cpu_to_le16(len);
+ h.options = cpu_to_le16(opt);
+ h.data = cpu_to_le32(data);
+
+ msg->buffer = kzalloc(SSP_HEADER_SIZE_ALIGNED + len,
+ GFP_KERNEL | GFP_DMA);
+ if (!msg->buffer) {
+ kfree(msg);
+ return NULL;
+ }
+
+ msg->length = len;
+ msg->options = opt;
+
+ memcpy(msg->buffer, &h, SSP_HEADER_SIZE);
+
+ return msg;
+}
+
+/*
+ * It is a bit heavy to do it this way but often the function is used to compose
+ * the message from smaller chunks which are placed on the stack. Often the
+ * chunks are small so memcpy should be optimalized.
+ */
+static inline void ssp_fill_buffer(struct ssp_msg *m, unsigned int offset,
+ const void *src, unsigned int len)
+{
+ memcpy(&m->buffer[SSP_HEADER_SIZE_ALIGNED + offset], src, len);
+}
+
+static inline void ssp_get_buffer(struct ssp_msg *m, unsigned int offset,
+ void *dest, unsigned int len)
+{
+ memcpy(dest, &m->buffer[SSP_HEADER_SIZE_ALIGNED + offset], len);
+}
+
+#define SSP_GET_BUFFER_AT_INDEX(m, index) \
+ (m->buffer[SSP_HEADER_SIZE_ALIGNED + index])
+#define SSP_SET_BUFFER_AT_INDEX(m, index, val) \
+ (m->buffer[SSP_HEADER_SIZE_ALIGNED + index] = val)
+
+static void ssp_clean_msg(struct ssp_msg *m)
+{
+ kfree(m->buffer);
+ kfree(m);
+}
+
+static int ssp_print_mcu_debug(char *data_frame, int *data_index,
+ int received_len)
+{
+ int length = data_frame[(*data_index)++];
+
+ if (length > received_len - *data_index || length <= 0) {
+ ssp_dbg("[SSP]: MSG From MCU-invalid debug length(%d/%d)\n",
+ length, received_len);
+ return -EPROTO;
+ }
+
+ ssp_dbg("[SSP]: MSG From MCU - %s\n", &data_frame[*data_index]);
+
+ *data_index += length;
+
+ return 0;
+}
+
+/*
+ * It was designed that way - additional lines to some kind of handshake,
+ * please do not ask why - only the firmware guy can know it.
+ */
+static int ssp_check_lines(struct ssp_data *data, bool state)
+{
+ int delay_cnt = 0;
+
+ gpiod_set_value_cansleep(data->ap_mcu_gpiod, state);
+
+ while (gpiod_get_value_cansleep(data->mcu_ap_gpiod) != state) {
+ usleep_range(3000, 3500);
+
+ if (data->shut_down || delay_cnt++ > 500) {
+ dev_err(SSP_DEV, "%s:timeout, hw ack wait fail %d\n",
+ __func__, state);
+
+ if (!state)
+ gpiod_set_value_cansleep(data->ap_mcu_gpiod, 1);
+
+ return -ETIMEDOUT;
+ }
+ }
+
+ return 0;
+}
+
+static int ssp_do_transfer(struct ssp_data *data, struct ssp_msg *msg,
+ struct completion *done, int timeout)
+{
+ int status;
+ /*
+ * check if this is a short one way message or the whole transfer has
+ * second part after an interrupt
+ */
+ const bool use_no_irq = msg->length == 0;
+
+ if (data->shut_down)
+ return -EPERM;
+
+ msg->done = done;
+
+ mutex_lock(&data->comm_lock);
+
+ status = ssp_check_lines(data, false);
+ if (status < 0)
+ goto _error_locked;
+
+ status = spi_write(data->spi, msg->buffer, SSP_HEADER_SIZE);
+ if (status < 0) {
+ gpiod_set_value_cansleep(data->ap_mcu_gpiod, 1);
+ dev_err(SSP_DEV, "%s spi_write fail\n", __func__);
+ goto _error_locked;
+ }
+
+ if (!use_no_irq) {
+ mutex_lock(&data->pending_lock);
+ list_add_tail(&msg->list, &data->pending_list);
+ mutex_unlock(&data->pending_lock);
+ }
+
+ status = ssp_check_lines(data, true);
+ if (status < 0) {
+ if (!use_no_irq) {
+ mutex_lock(&data->pending_lock);
+ list_del(&msg->list);
+ mutex_unlock(&data->pending_lock);
+ }
+ goto _error_locked;
+ }
+
+ mutex_unlock(&data->comm_lock);
+
+ if (!use_no_irq && done)
+ if (wait_for_completion_timeout(done,
+ msecs_to_jiffies(timeout)) ==
+ 0) {
+ mutex_lock(&data->pending_lock);
+ list_del(&msg->list);
+ mutex_unlock(&data->pending_lock);
+
+ data->timeout_cnt++;
+ return -ETIMEDOUT;
+ }
+
+ return 0;
+
+_error_locked:
+ mutex_unlock(&data->comm_lock);
+ data->timeout_cnt++;
+ return status;
+}
+
+static inline int ssp_spi_sync_command(struct ssp_data *data,
+ struct ssp_msg *msg)
+{
+ return ssp_do_transfer(data, msg, NULL, 0);
+}
+
+static int ssp_spi_sync(struct ssp_data *data, struct ssp_msg *msg,
+ int timeout)
+{
+ DECLARE_COMPLETION_ONSTACK(done);
+
+ if (WARN_ON(!msg->length))
+ return -EPERM;
+
+ return ssp_do_transfer(data, msg, &done, timeout);
+}
+
+static int ssp_handle_big_data(struct ssp_data *data, char *dataframe, int *idx)
+{
+ /* mock-up, it will be changed with adding another sensor types */
+ *idx += 8;
+ return 0;
+}
+
+static int ssp_parse_dataframe(struct ssp_data *data, char *dataframe, int len)
+{
+ int idx, sd;
+ struct ssp_sensor_data *spd;
+ struct iio_dev **indio_devs = data->sensor_devs;
+
+ for (idx = 0; idx < len;) {
+ switch (dataframe[idx++]) {
+ case SSP_MSG2AP_INST_BYPASS_DATA:
+ if (idx >= len)
+ return -EPROTO;
+ sd = dataframe[idx++];
+ if (sd < 0 || sd >= SSP_SENSOR_MAX) {
+ dev_err(SSP_DEV,
+ "Mcu data frame1 error %d\n", sd);
+ return -EPROTO;
+ }
+
+ if (indio_devs[sd]) {
+ spd = iio_priv(indio_devs[sd]);
+ if (spd->process_data) {
+ if (idx >= len)
+ return -EPROTO;
+ spd->process_data(indio_devs[sd],
+ &dataframe[idx],
+ data->timestamp);
+ }
+ } else {
+ dev_err(SSP_DEV, "no client for frame\n");
+ }
+
+ idx += ssp_offset_map[sd];
+ break;
+ case SSP_MSG2AP_INST_DEBUG_DATA:
+ if (idx >= len)
+ return -EPROTO;
+ sd = ssp_print_mcu_debug(dataframe, &idx, len);
+ if (sd) {
+ dev_err(SSP_DEV,
+ "Mcu data frame3 error %d\n", sd);
+ return sd;
+ }
+ break;
+ case SSP_MSG2AP_INST_LIBRARY_DATA:
+ idx += len;
+ break;
+ case SSP_MSG2AP_INST_BIG_DATA:
+ ssp_handle_big_data(data, dataframe, &idx);
+ break;
+ case SSP_MSG2AP_INST_TIME_SYNC:
+ data->time_syncing = true;
+ break;
+ case SSP_MSG2AP_INST_RESET:
+ ssp_queue_ssp_refresh_task(data, 0);
+ break;
+ }
+ }
+
+ if (data->time_syncing)
+ data->timestamp = ktime_get_real_ns();
+
+ return 0;
+}
+
+/* threaded irq */
+int ssp_irq_msg(struct ssp_data *data)
+{
+ char *buffer;
+ u8 msg_type;
+ int ret;
+ u16 length, msg_options;
+ struct ssp_msg *msg = NULL, *iter, *n;
+
+ ret = spi_read(data->spi, data->header_buffer, SSP_HEADER_BUFFER_SIZE);
+ if (ret < 0) {
+ dev_err(SSP_DEV, "header read fail\n");
+ return ret;
+ }
+
+ length = le16_to_cpu(data->header_buffer[1]);
+ msg_options = le16_to_cpu(data->header_buffer[0]);
+
+ if (length == 0) {
+ dev_err(SSP_DEV, "length received from mcu is 0\n");
+ return -EINVAL;
+ }
+
+ msg_type = SSP_GET_MESSAGE_TYPE(msg_options);
+
+ switch (msg_type) {
+ case SSP_AP2HUB_READ:
+ case SSP_AP2HUB_WRITE:
+ /*
+ * this is a small list, a few elements - the packets can be
+ * received with no order
+ */
+ mutex_lock(&data->pending_lock);
+ list_for_each_entry_safe(iter, n, &data->pending_list, list) {
+ if (iter->options == msg_options) {
+ list_del(&iter->list);
+ msg = iter;
+ break;
+ }
+ }
+
+ if (!msg) {
+ /*
+ * here can be implemented dead messages handling
+ * but the slave should not send such ones - it is to
+ * check but let's handle this
+ */
+ buffer = kmalloc(length, GFP_KERNEL | GFP_DMA);
+ if (!buffer) {
+ ret = -ENOMEM;
+ goto _unlock;
+ }
+
+ /* got dead packet so it is always an error */
+ ret = spi_read(data->spi, buffer, length);
+ if (ret >= 0)
+ ret = -EPROTO;
+
+ kfree(buffer);
+
+ dev_err(SSP_DEV, "No match error %x\n",
+ msg_options);
+
+ goto _unlock;
+ }
+
+ if (msg_type == SSP_AP2HUB_READ)
+ ret = spi_read(data->spi,
+ &msg->buffer[SSP_HEADER_SIZE_ALIGNED],
+ msg->length);
+
+ if (msg_type == SSP_AP2HUB_WRITE) {
+ ret = spi_write(data->spi,
+ &msg->buffer[SSP_HEADER_SIZE_ALIGNED],
+ msg->length);
+ if (msg_options & SSP_AP2HUB_RETURN) {
+ msg->options =
+ SSP_AP2HUB_READ | SSP_AP2HUB_RETURN;
+ msg->length = 1;
+
+ list_add_tail(&msg->list, &data->pending_list);
+ goto _unlock;
+ }
+ }
+
+ if (msg->done)
+ if (!completion_done(msg->done))
+ complete(msg->done);
+_unlock:
+ mutex_unlock(&data->pending_lock);
+ break;
+ case SSP_HUB2AP_WRITE:
+ buffer = kzalloc(length, GFP_KERNEL | GFP_DMA);
+ if (!buffer)
+ return -ENOMEM;
+
+ ret = spi_read(data->spi, buffer, length);
+ if (ret < 0) {
+ dev_err(SSP_DEV, "spi read fail\n");
+ kfree(buffer);
+ break;
+ }
+
+ ret = ssp_parse_dataframe(data, buffer, length);
+
+ kfree(buffer);
+ break;
+
+ default:
+ dev_err(SSP_DEV, "unknown msg type\n");
+ return -EPROTO;
+ }
+
+ return ret;
+}
+
+void ssp_clean_pending_list(struct ssp_data *data)
+{
+ struct ssp_msg *msg, *n;
+
+ mutex_lock(&data->pending_lock);
+ list_for_each_entry_safe(msg, n, &data->pending_list, list) {
+ list_del(&msg->list);
+
+ if (msg->done)
+ if (!completion_done(msg->done))
+ complete(msg->done);
+ }
+ mutex_unlock(&data->pending_lock);
+}
+
+int ssp_command(struct ssp_data *data, char command, int arg)
+{
+ int ret;
+ struct ssp_msg *msg;
+
+ msg = ssp_create_msg(command, 0, SSP_AP2HUB_WRITE, arg);
+ if (!msg)
+ return -ENOMEM;
+
+ ssp_dbg("%s - command 0x%x %d\n", __func__, command, arg);
+
+ ret = ssp_spi_sync_command(data, msg);
+ ssp_clean_msg(msg);
+
+ return ret;
+}
+
+int ssp_send_instruction(struct ssp_data *data, u8 inst, u8 sensor_type,
+ u8 *send_buf, u8 length)
+{
+ int ret;
+ struct ssp_msg *msg;
+
+ if (data->fw_dl_state == SSP_FW_DL_STATE_DOWNLOADING) {
+ dev_err(SSP_DEV, "%s - Skip Inst! DL state = %d\n",
+ __func__, data->fw_dl_state);
+ return -EBUSY;
+ } else if (!(data->available_sensors & BIT(sensor_type)) &&
+ (inst <= SSP_MSG2SSP_INST_CHANGE_DELAY)) {
+ dev_err(SSP_DEV, "%s - Bypass Inst Skip! - %u\n",
+ __func__, sensor_type);
+ return -EIO; /* just fail */
+ }
+
+ msg = ssp_create_msg(inst, length + 2, SSP_AP2HUB_WRITE, 0);
+ if (!msg)
+ return -ENOMEM;
+
+ ssp_fill_buffer(msg, 0, &sensor_type, 1);
+ ssp_fill_buffer(msg, 1, send_buf, length);
+
+ ssp_dbg("%s - Inst = 0x%x, Sensor Type = 0x%x, data = %u\n",
+ __func__, inst, sensor_type, send_buf[1]);
+
+ ret = ssp_spi_sync(data, msg, 1000);
+ ssp_clean_msg(msg);
+
+ return ret;
+}
+
+int ssp_get_chipid(struct ssp_data *data)
+{
+ int ret;
+ char buffer;
+ struct ssp_msg *msg;
+
+ msg = ssp_create_msg(SSP_MSG2SSP_AP_WHOAMI, 1, SSP_AP2HUB_READ, 0);
+ if (!msg)
+ return -ENOMEM;
+
+ ret = ssp_spi_sync(data, msg, 1000);
+
+ buffer = SSP_GET_BUFFER_AT_INDEX(msg, 0);
+
+ ssp_clean_msg(msg);
+
+ return ret < 0 ? ret : buffer;
+}
+
+int ssp_set_magnetic_matrix(struct ssp_data *data)
+{
+ int ret;
+ struct ssp_msg *msg;
+
+ msg = ssp_create_msg(SSP_MSG2SSP_AP_SET_MAGNETIC_STATIC_MATRIX,
+ data->sensorhub_info->mag_length, SSP_AP2HUB_WRITE,
+ 0);
+ if (!msg)
+ return -ENOMEM;
+
+ ssp_fill_buffer(msg, 0, data->sensorhub_info->mag_table,
+ data->sensorhub_info->mag_length);
+
+ ret = ssp_spi_sync(data, msg, 1000);
+ ssp_clean_msg(msg);
+
+ return ret;
+}
+
+unsigned int ssp_get_sensor_scanning_info(struct ssp_data *data)
+{
+ int ret;
+ __le32 result;
+ u32 cpu_result = 0;
+
+ struct ssp_msg *msg = ssp_create_msg(SSP_MSG2SSP_AP_SENSOR_SCANNING, 4,
+ SSP_AP2HUB_READ, 0);
+ if (!msg)
+ return 0;
+
+ ret = ssp_spi_sync(data, msg, 1000);
+ if (ret < 0) {
+ dev_err(SSP_DEV, "%s - spi read fail %d\n", __func__, ret);
+ goto _exit;
+ }
+
+ ssp_get_buffer(msg, 0, &result, 4);
+ cpu_result = le32_to_cpu(result);
+
+ dev_info(SSP_DEV, "%s state: 0x%08x\n", __func__, cpu_result);
+
+_exit:
+ ssp_clean_msg(msg);
+ return cpu_result;
+}
+
+unsigned int ssp_get_firmware_rev(struct ssp_data *data)
+{
+ int ret;
+ __le32 result;
+
+ struct ssp_msg *msg = ssp_create_msg(SSP_MSG2SSP_AP_FIRMWARE_REV, 4,
+ SSP_AP2HUB_READ, 0);
+ if (!msg)
+ return SSP_INVALID_REVISION;
+
+ ret = ssp_spi_sync(data, msg, 1000);
+ if (ret < 0) {
+ dev_err(SSP_DEV, "%s - transfer fail %d\n", __func__, ret);
+ ret = SSP_INVALID_REVISION;
+ goto _exit;
+ }
+
+ ssp_get_buffer(msg, 0, &result, 4);
+ ret = le32_to_cpu(result);
+
+_exit:
+ ssp_clean_msg(msg);
+ return ret;
+}
diff --git a/drivers/iio/common/st_sensors/Kconfig b/drivers/iio/common/st_sensors/Kconfig
new file mode 100644
index 0000000000..eda8f347fd
--- /dev/null
+++ b/drivers/iio/common/st_sensors/Kconfig
@@ -0,0 +1,15 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# STMicroelectronics sensors common library
+#
+
+config IIO_ST_SENSORS_I2C
+ tristate
+ select REGMAP_I2C
+
+config IIO_ST_SENSORS_SPI
+ tristate
+ select REGMAP_SPI
+
+config IIO_ST_SENSORS_CORE
+ tristate
diff --git a/drivers/iio/common/st_sensors/Makefile b/drivers/iio/common/st_sensors/Makefile
new file mode 100644
index 0000000000..f7fb3b79b6
--- /dev/null
+++ b/drivers/iio/common/st_sensors/Makefile
@@ -0,0 +1,11 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for the STMicroelectronics sensor common modules.
+#
+
+obj-$(CONFIG_IIO_ST_SENSORS_I2C) += st_sensors_i2c.o
+obj-$(CONFIG_IIO_ST_SENSORS_SPI) += st_sensors_spi.o
+obj-$(CONFIG_IIO_ST_SENSORS_CORE) += st_sensors.o
+st_sensors-y := st_sensors_core.o
+st_sensors-$(CONFIG_IIO_BUFFER) += st_sensors_buffer.o
+st_sensors-$(CONFIG_IIO_TRIGGER) += st_sensors_trigger.o
diff --git a/drivers/iio/common/st_sensors/st_sensors_buffer.c b/drivers/iio/common/st_sensors/st_sensors_buffer.c
new file mode 100644
index 0000000000..e2f108ca94
--- /dev/null
+++ b/drivers/iio/common/st_sensors/st_sensors_buffer.c
@@ -0,0 +1,79 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * STMicroelectronics sensors buffer library driver
+ *
+ * Copyright 2012-2013 STMicroelectronics Inc.
+ *
+ * Denis Ciocca <denis.ciocca@st.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/trigger.h>
+#include <linux/interrupt.h>
+#include <linux/iio/buffer.h>
+#include <linux/iio/trigger_consumer.h>
+#include <linux/irqreturn.h>
+#include <linux/regmap.h>
+
+#include <linux/iio/common/st_sensors.h>
+
+
+static int st_sensors_get_buffer_element(struct iio_dev *indio_dev, u8 *buf)
+{
+ struct st_sensor_data *sdata = iio_priv(indio_dev);
+ unsigned int num_data_channels = sdata->num_data_channels;
+ int i;
+
+ for_each_set_bit(i, indio_dev->active_scan_mask, num_data_channels) {
+ const struct iio_chan_spec *channel = &indio_dev->channels[i];
+ unsigned int bytes_to_read =
+ DIV_ROUND_UP(channel->scan_type.realbits +
+ channel->scan_type.shift, 8);
+ unsigned int storage_bytes =
+ channel->scan_type.storagebits >> 3;
+
+ buf = PTR_ALIGN(buf, storage_bytes);
+ if (regmap_bulk_read(sdata->regmap, channel->address,
+ buf, bytes_to_read) < 0)
+ return -EIO;
+
+ /* Advance the buffer pointer */
+ buf += storage_bytes;
+ }
+
+ return 0;
+}
+
+irqreturn_t st_sensors_trigger_handler(int irq, void *p)
+{
+ int len;
+ struct iio_poll_func *pf = p;
+ struct iio_dev *indio_dev = pf->indio_dev;
+ struct st_sensor_data *sdata = iio_priv(indio_dev);
+ s64 timestamp;
+
+ /*
+ * If we do timestamping here, do it before reading the values, because
+ * once we've read the values, new interrupts can occur (when using
+ * the hardware trigger) and the hw_timestamp may get updated.
+ * By storing it in a local variable first, we are safe.
+ */
+ if (iio_trigger_using_own(indio_dev))
+ timestamp = sdata->hw_timestamp;
+ else
+ timestamp = iio_get_time_ns(indio_dev);
+
+ len = st_sensors_get_buffer_element(indio_dev, sdata->buffer_data);
+ if (len < 0)
+ goto st_sensors_get_buffer_element_error;
+
+ iio_push_to_buffers_with_timestamp(indio_dev, sdata->buffer_data,
+ timestamp);
+
+st_sensors_get_buffer_element_error:
+ iio_trigger_notify_done(indio_dev->trig);
+
+ return IRQ_HANDLED;
+}
+EXPORT_SYMBOL_NS(st_sensors_trigger_handler, IIO_ST_SENSORS);
diff --git a/drivers/iio/common/st_sensors/st_sensors_core.c b/drivers/iio/common/st_sensors/st_sensors_core.c
new file mode 100644
index 0000000000..c77d7bdcc1
--- /dev/null
+++ b/drivers/iio/common/st_sensors/st_sensors_core.c
@@ -0,0 +1,664 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * STMicroelectronics sensors core library driver
+ *
+ * Copyright 2012-2013 STMicroelectronics Inc.
+ *
+ * Denis Ciocca <denis.ciocca@st.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/iio/iio.h>
+#include <linux/mutex.h>
+#include <linux/property.h>
+#include <linux/regulator/consumer.h>
+#include <linux/regmap.h>
+#include <asm/unaligned.h>
+#include <linux/iio/common/st_sensors.h>
+
+#include "st_sensors_core.h"
+
+int st_sensors_write_data_with_mask(struct iio_dev *indio_dev,
+ u8 reg_addr, u8 mask, u8 data)
+{
+ struct st_sensor_data *sdata = iio_priv(indio_dev);
+
+ return regmap_update_bits(sdata->regmap,
+ reg_addr, mask, data << __ffs(mask));
+}
+
+int st_sensors_debugfs_reg_access(struct iio_dev *indio_dev,
+ unsigned reg, unsigned writeval,
+ unsigned *readval)
+{
+ struct st_sensor_data *sdata = iio_priv(indio_dev);
+ int err;
+
+ if (!readval)
+ return regmap_write(sdata->regmap, reg, writeval);
+
+ err = regmap_read(sdata->regmap, reg, readval);
+ if (err < 0)
+ return err;
+
+ return 0;
+}
+EXPORT_SYMBOL_NS(st_sensors_debugfs_reg_access, IIO_ST_SENSORS);
+
+static int st_sensors_match_odr(struct st_sensor_settings *sensor_settings,
+ unsigned int odr, struct st_sensor_odr_avl *odr_out)
+{
+ int i, ret = -EINVAL;
+
+ for (i = 0; i < ST_SENSORS_ODR_LIST_MAX; i++) {
+ if (sensor_settings->odr.odr_avl[i].hz == 0)
+ goto st_sensors_match_odr_error;
+
+ if (sensor_settings->odr.odr_avl[i].hz == odr) {
+ odr_out->hz = sensor_settings->odr.odr_avl[i].hz;
+ odr_out->value = sensor_settings->odr.odr_avl[i].value;
+ ret = 0;
+ break;
+ }
+ }
+
+st_sensors_match_odr_error:
+ return ret;
+}
+
+int st_sensors_set_odr(struct iio_dev *indio_dev, unsigned int odr)
+{
+ int err = 0;
+ struct st_sensor_odr_avl odr_out = {0, 0};
+ struct st_sensor_data *sdata = iio_priv(indio_dev);
+
+ mutex_lock(&sdata->odr_lock);
+
+ if (!sdata->sensor_settings->odr.mask)
+ goto unlock_mutex;
+
+ err = st_sensors_match_odr(sdata->sensor_settings, odr, &odr_out);
+ if (err < 0)
+ goto unlock_mutex;
+
+ if ((sdata->sensor_settings->odr.addr ==
+ sdata->sensor_settings->pw.addr) &&
+ (sdata->sensor_settings->odr.mask ==
+ sdata->sensor_settings->pw.mask)) {
+ if (sdata->enabled == true) {
+ err = st_sensors_write_data_with_mask(indio_dev,
+ sdata->sensor_settings->odr.addr,
+ sdata->sensor_settings->odr.mask,
+ odr_out.value);
+ } else {
+ err = 0;
+ }
+ } else {
+ err = st_sensors_write_data_with_mask(indio_dev,
+ sdata->sensor_settings->odr.addr,
+ sdata->sensor_settings->odr.mask,
+ odr_out.value);
+ }
+ if (err >= 0)
+ sdata->odr = odr_out.hz;
+
+unlock_mutex:
+ mutex_unlock(&sdata->odr_lock);
+
+ return err;
+}
+EXPORT_SYMBOL_NS(st_sensors_set_odr, IIO_ST_SENSORS);
+
+static int st_sensors_match_fs(struct st_sensor_settings *sensor_settings,
+ unsigned int fs, int *index_fs_avl)
+{
+ int i, ret = -EINVAL;
+
+ for (i = 0; i < ST_SENSORS_FULLSCALE_AVL_MAX; i++) {
+ if (sensor_settings->fs.fs_avl[i].num == 0)
+ return ret;
+
+ if (sensor_settings->fs.fs_avl[i].num == fs) {
+ *index_fs_avl = i;
+ ret = 0;
+ break;
+ }
+ }
+
+ return ret;
+}
+
+static int st_sensors_set_fullscale(struct iio_dev *indio_dev, unsigned int fs)
+{
+ int err, i = 0;
+ struct st_sensor_data *sdata = iio_priv(indio_dev);
+
+ if (sdata->sensor_settings->fs.addr == 0)
+ return 0;
+
+ err = st_sensors_match_fs(sdata->sensor_settings, fs, &i);
+ if (err < 0)
+ goto st_accel_set_fullscale_error;
+
+ err = st_sensors_write_data_with_mask(indio_dev,
+ sdata->sensor_settings->fs.addr,
+ sdata->sensor_settings->fs.mask,
+ sdata->sensor_settings->fs.fs_avl[i].value);
+ if (err < 0)
+ goto st_accel_set_fullscale_error;
+
+ sdata->current_fullscale = &sdata->sensor_settings->fs.fs_avl[i];
+ return err;
+
+st_accel_set_fullscale_error:
+ dev_err(&indio_dev->dev, "failed to set new fullscale.\n");
+ return err;
+}
+
+int st_sensors_set_enable(struct iio_dev *indio_dev, bool enable)
+{
+ u8 tmp_value;
+ int err = -EINVAL;
+ bool found = false;
+ struct st_sensor_odr_avl odr_out = {0, 0};
+ struct st_sensor_data *sdata = iio_priv(indio_dev);
+
+ if (enable) {
+ tmp_value = sdata->sensor_settings->pw.value_on;
+ if ((sdata->sensor_settings->odr.addr ==
+ sdata->sensor_settings->pw.addr) &&
+ (sdata->sensor_settings->odr.mask ==
+ sdata->sensor_settings->pw.mask)) {
+ err = st_sensors_match_odr(sdata->sensor_settings,
+ sdata->odr, &odr_out);
+ if (err < 0)
+ goto set_enable_error;
+ tmp_value = odr_out.value;
+ found = true;
+ }
+ err = st_sensors_write_data_with_mask(indio_dev,
+ sdata->sensor_settings->pw.addr,
+ sdata->sensor_settings->pw.mask, tmp_value);
+ if (err < 0)
+ goto set_enable_error;
+
+ sdata->enabled = true;
+
+ if (found)
+ sdata->odr = odr_out.hz;
+ } else {
+ err = st_sensors_write_data_with_mask(indio_dev,
+ sdata->sensor_settings->pw.addr,
+ sdata->sensor_settings->pw.mask,
+ sdata->sensor_settings->pw.value_off);
+ if (err < 0)
+ goto set_enable_error;
+
+ sdata->enabled = false;
+ }
+
+set_enable_error:
+ return err;
+}
+EXPORT_SYMBOL_NS(st_sensors_set_enable, IIO_ST_SENSORS);
+
+int st_sensors_set_axis_enable(struct iio_dev *indio_dev, u8 axis_enable)
+{
+ struct st_sensor_data *sdata = iio_priv(indio_dev);
+ int err = 0;
+
+ if (sdata->sensor_settings->enable_axis.addr)
+ err = st_sensors_write_data_with_mask(indio_dev,
+ sdata->sensor_settings->enable_axis.addr,
+ sdata->sensor_settings->enable_axis.mask,
+ axis_enable);
+ return err;
+}
+EXPORT_SYMBOL_NS(st_sensors_set_axis_enable, IIO_ST_SENSORS);
+
+
+int st_sensors_power_enable(struct iio_dev *indio_dev)
+{
+ static const char * const regulator_names[] = { "vdd", "vddio" };
+ struct device *parent = indio_dev->dev.parent;
+ int err;
+
+ /* Regulators not mandatory, but if requested we should enable them. */
+ err = devm_regulator_bulk_get_enable(parent,
+ ARRAY_SIZE(regulator_names),
+ regulator_names);
+ if (err)
+ return dev_err_probe(&indio_dev->dev, err,
+ "unable to enable supplies\n");
+
+ return 0;
+}
+EXPORT_SYMBOL_NS(st_sensors_power_enable, IIO_ST_SENSORS);
+
+static int st_sensors_set_drdy_int_pin(struct iio_dev *indio_dev,
+ struct st_sensors_platform_data *pdata)
+{
+ struct st_sensor_data *sdata = iio_priv(indio_dev);
+
+ /* Sensor does not support interrupts */
+ if (!sdata->sensor_settings->drdy_irq.int1.addr &&
+ !sdata->sensor_settings->drdy_irq.int2.addr) {
+ if (pdata->drdy_int_pin)
+ dev_info(&indio_dev->dev,
+ "DRDY on pin INT%d specified, but sensor does not support interrupts\n",
+ pdata->drdy_int_pin);
+ return 0;
+ }
+
+ switch (pdata->drdy_int_pin) {
+ case 1:
+ if (!sdata->sensor_settings->drdy_irq.int1.mask) {
+ dev_err(&indio_dev->dev,
+ "DRDY on INT1 not available.\n");
+ return -EINVAL;
+ }
+ sdata->drdy_int_pin = 1;
+ break;
+ case 2:
+ if (!sdata->sensor_settings->drdy_irq.int2.mask) {
+ dev_err(&indio_dev->dev,
+ "DRDY on INT2 not available.\n");
+ return -EINVAL;
+ }
+ sdata->drdy_int_pin = 2;
+ break;
+ default:
+ dev_err(&indio_dev->dev, "DRDY on pdata not valid.\n");
+ return -EINVAL;
+ }
+
+ if (pdata->open_drain) {
+ if (!sdata->sensor_settings->drdy_irq.int1.addr_od &&
+ !sdata->sensor_settings->drdy_irq.int2.addr_od)
+ dev_err(&indio_dev->dev,
+ "open drain requested but unsupported.\n");
+ else
+ sdata->int_pin_open_drain = true;
+ }
+
+ return 0;
+}
+
+static struct st_sensors_platform_data *st_sensors_dev_probe(struct device *dev,
+ struct st_sensors_platform_data *defdata)
+{
+ struct st_sensors_platform_data *pdata;
+ u32 val;
+
+ if (!dev_fwnode(dev))
+ return NULL;
+
+ pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata)
+ return ERR_PTR(-ENOMEM);
+ if (!device_property_read_u32(dev, "st,drdy-int-pin", &val) && (val <= 2))
+ pdata->drdy_int_pin = (u8) val;
+ else
+ pdata->drdy_int_pin = defdata ? defdata->drdy_int_pin : 0;
+
+ pdata->open_drain = device_property_read_bool(dev, "drive-open-drain");
+
+ return pdata;
+}
+
+/**
+ * st_sensors_dev_name_probe() - device probe for ST sensor name
+ * @dev: driver model representation of the device.
+ * @name: device name buffer reference.
+ * @len: device name buffer length.
+ *
+ * In effect this function matches an ID to an internal kernel
+ * name for a certain sensor device, so that the rest of the autodetection can
+ * rely on that name from this point on. I2C/SPI devices will be renamed
+ * to match the internal kernel convention.
+ */
+void st_sensors_dev_name_probe(struct device *dev, char *name, int len)
+{
+ const void *match;
+
+ match = device_get_match_data(dev);
+ if (!match)
+ return;
+
+ /* The name from the match takes precedence if present */
+ strscpy(name, match, len);
+}
+EXPORT_SYMBOL_NS(st_sensors_dev_name_probe, IIO_ST_SENSORS);
+
+int st_sensors_init_sensor(struct iio_dev *indio_dev,
+ struct st_sensors_platform_data *pdata)
+{
+ struct st_sensor_data *sdata = iio_priv(indio_dev);
+ struct st_sensors_platform_data *of_pdata;
+ int err = 0;
+
+ mutex_init(&sdata->odr_lock);
+
+ /* If OF/DT pdata exists, it will take precedence of anything else */
+ of_pdata = st_sensors_dev_probe(indio_dev->dev.parent, pdata);
+ if (IS_ERR(of_pdata))
+ return PTR_ERR(of_pdata);
+ if (of_pdata)
+ pdata = of_pdata;
+
+ if (pdata) {
+ err = st_sensors_set_drdy_int_pin(indio_dev, pdata);
+ if (err < 0)
+ return err;
+ }
+
+ err = st_sensors_set_enable(indio_dev, false);
+ if (err < 0)
+ return err;
+
+ /* Disable DRDY, this might be still be enabled after reboot. */
+ err = st_sensors_set_dataready_irq(indio_dev, false);
+ if (err < 0)
+ return err;
+
+ if (sdata->current_fullscale) {
+ err = st_sensors_set_fullscale(indio_dev,
+ sdata->current_fullscale->num);
+ if (err < 0)
+ return err;
+ } else
+ dev_info(&indio_dev->dev, "Full-scale not possible\n");
+
+ err = st_sensors_set_odr(indio_dev, sdata->odr);
+ if (err < 0)
+ return err;
+
+ /* set BDU */
+ if (sdata->sensor_settings->bdu.addr) {
+ err = st_sensors_write_data_with_mask(indio_dev,
+ sdata->sensor_settings->bdu.addr,
+ sdata->sensor_settings->bdu.mask, true);
+ if (err < 0)
+ return err;
+ }
+
+ /* set DAS */
+ if (sdata->sensor_settings->das.addr) {
+ err = st_sensors_write_data_with_mask(indio_dev,
+ sdata->sensor_settings->das.addr,
+ sdata->sensor_settings->das.mask, 1);
+ if (err < 0)
+ return err;
+ }
+
+ if (sdata->int_pin_open_drain) {
+ u8 addr, mask;
+
+ if (sdata->drdy_int_pin == 1) {
+ addr = sdata->sensor_settings->drdy_irq.int1.addr_od;
+ mask = sdata->sensor_settings->drdy_irq.int1.mask_od;
+ } else {
+ addr = sdata->sensor_settings->drdy_irq.int2.addr_od;
+ mask = sdata->sensor_settings->drdy_irq.int2.mask_od;
+ }
+
+ dev_info(&indio_dev->dev,
+ "set interrupt line to open drain mode on pin %d\n",
+ sdata->drdy_int_pin);
+ err = st_sensors_write_data_with_mask(indio_dev, addr,
+ mask, 1);
+ if (err < 0)
+ return err;
+ }
+
+ err = st_sensors_set_axis_enable(indio_dev, ST_SENSORS_ENABLE_ALL_AXIS);
+
+ return err;
+}
+EXPORT_SYMBOL_NS(st_sensors_init_sensor, IIO_ST_SENSORS);
+
+int st_sensors_set_dataready_irq(struct iio_dev *indio_dev, bool enable)
+{
+ int err;
+ u8 drdy_addr, drdy_mask;
+ struct st_sensor_data *sdata = iio_priv(indio_dev);
+
+ if (!sdata->sensor_settings->drdy_irq.int1.addr &&
+ !sdata->sensor_settings->drdy_irq.int2.addr) {
+ /*
+ * there are some devices (e.g. LIS3MDL) where drdy line is
+ * routed to a given pin and it is not possible to select a
+ * different one. Take into account irq status register
+ * to understand if irq trigger can be properly supported
+ */
+ if (sdata->sensor_settings->drdy_irq.stat_drdy.addr)
+ sdata->hw_irq_trigger = enable;
+ return 0;
+ }
+
+ /* Enable/Disable the interrupt generator 1. */
+ if (sdata->sensor_settings->drdy_irq.ig1.en_addr > 0) {
+ err = st_sensors_write_data_with_mask(indio_dev,
+ sdata->sensor_settings->drdy_irq.ig1.en_addr,
+ sdata->sensor_settings->drdy_irq.ig1.en_mask,
+ (int)enable);
+ if (err < 0)
+ goto st_accel_set_dataready_irq_error;
+ }
+
+ if (sdata->drdy_int_pin == 1) {
+ drdy_addr = sdata->sensor_settings->drdy_irq.int1.addr;
+ drdy_mask = sdata->sensor_settings->drdy_irq.int1.mask;
+ } else {
+ drdy_addr = sdata->sensor_settings->drdy_irq.int2.addr;
+ drdy_mask = sdata->sensor_settings->drdy_irq.int2.mask;
+ }
+
+ /* Flag to the poll function that the hardware trigger is in use */
+ sdata->hw_irq_trigger = enable;
+
+ /* Enable/Disable the interrupt generator for data ready. */
+ err = st_sensors_write_data_with_mask(indio_dev, drdy_addr,
+ drdy_mask, (int)enable);
+
+st_accel_set_dataready_irq_error:
+ return err;
+}
+EXPORT_SYMBOL_NS(st_sensors_set_dataready_irq, IIO_ST_SENSORS);
+
+int st_sensors_set_fullscale_by_gain(struct iio_dev *indio_dev, int scale)
+{
+ int err = -EINVAL, i;
+ struct st_sensor_data *sdata = iio_priv(indio_dev);
+
+ for (i = 0; i < ST_SENSORS_FULLSCALE_AVL_MAX; i++) {
+ if ((sdata->sensor_settings->fs.fs_avl[i].gain == scale) &&
+ (sdata->sensor_settings->fs.fs_avl[i].gain != 0)) {
+ err = 0;
+ break;
+ }
+ }
+ if (err < 0)
+ goto st_sensors_match_scale_error;
+
+ err = st_sensors_set_fullscale(indio_dev,
+ sdata->sensor_settings->fs.fs_avl[i].num);
+
+st_sensors_match_scale_error:
+ return err;
+}
+EXPORT_SYMBOL_NS(st_sensors_set_fullscale_by_gain, IIO_ST_SENSORS);
+
+static int st_sensors_read_axis_data(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *ch, int *data)
+{
+ int err;
+ u8 *outdata;
+ struct st_sensor_data *sdata = iio_priv(indio_dev);
+ unsigned int byte_for_channel;
+
+ byte_for_channel = DIV_ROUND_UP(ch->scan_type.realbits +
+ ch->scan_type.shift, 8);
+ outdata = kmalloc(byte_for_channel, GFP_DMA | GFP_KERNEL);
+ if (!outdata)
+ return -ENOMEM;
+
+ err = regmap_bulk_read(sdata->regmap, ch->address,
+ outdata, byte_for_channel);
+ if (err < 0)
+ goto st_sensors_free_memory;
+
+ if (byte_for_channel == 1)
+ *data = (s8)*outdata;
+ else if (byte_for_channel == 2)
+ *data = (s16)get_unaligned_le16(outdata);
+ else if (byte_for_channel == 3)
+ *data = (s32)sign_extend32(get_unaligned_le24(outdata), 23);
+
+st_sensors_free_memory:
+ kfree(outdata);
+
+ return err;
+}
+
+int st_sensors_read_info_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *ch, int *val)
+{
+ int err;
+ struct st_sensor_data *sdata = iio_priv(indio_dev);
+
+ err = iio_device_claim_direct_mode(indio_dev);
+ if (err)
+ return err;
+
+ mutex_lock(&sdata->odr_lock);
+
+ err = st_sensors_set_enable(indio_dev, true);
+ if (err < 0)
+ goto out;
+
+ msleep((sdata->sensor_settings->bootime * 1000) / sdata->odr);
+ err = st_sensors_read_axis_data(indio_dev, ch, val);
+ if (err < 0)
+ goto out;
+
+ *val = *val >> ch->scan_type.shift;
+
+ err = st_sensors_set_enable(indio_dev, false);
+
+out:
+ mutex_unlock(&sdata->odr_lock);
+ iio_device_release_direct_mode(indio_dev);
+
+ return err;
+}
+EXPORT_SYMBOL_NS(st_sensors_read_info_raw, IIO_ST_SENSORS);
+
+/*
+ * st_sensors_get_settings_index() - get index of the sensor settings for a
+ * specific device from list of settings
+ * @name: device name buffer reference.
+ * @list: sensor settings list.
+ * @list_length: length of sensor settings list.
+ *
+ * Return: non negative number on success (valid index),
+ * negative error code otherwise.
+ */
+int st_sensors_get_settings_index(const char *name,
+ const struct st_sensor_settings *list,
+ const int list_length)
+{
+ int i, n;
+
+ for (i = 0; i < list_length; i++) {
+ for (n = 0; n < ST_SENSORS_MAX_4WAI; n++) {
+ if (strcmp(name, list[i].sensors_supported[n]) == 0)
+ return i;
+ }
+ }
+
+ return -ENODEV;
+}
+EXPORT_SYMBOL_NS(st_sensors_get_settings_index, IIO_ST_SENSORS);
+
+/*
+ * st_sensors_verify_id() - verify sensor ID (WhoAmI) is matching with the
+ * expected value
+ * @indio_dev: IIO device reference.
+ *
+ * Return: 0 on success (valid sensor ID), else a negative error code.
+ */
+int st_sensors_verify_id(struct iio_dev *indio_dev)
+{
+ struct st_sensor_data *sdata = iio_priv(indio_dev);
+ int wai, err;
+
+ if (sdata->sensor_settings->wai_addr) {
+ err = regmap_read(sdata->regmap,
+ sdata->sensor_settings->wai_addr, &wai);
+ if (err < 0) {
+ dev_err(&indio_dev->dev,
+ "failed to read Who-Am-I register.\n");
+ return err;
+ }
+
+ if (sdata->sensor_settings->wai != wai) {
+ dev_err(&indio_dev->dev,
+ "%s: WhoAmI mismatch (0x%x).\n",
+ indio_dev->name, wai);
+ return -EINVAL;
+ }
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_NS(st_sensors_verify_id, IIO_ST_SENSORS);
+
+ssize_t st_sensors_sysfs_sampling_frequency_avail(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ int i, len = 0;
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct st_sensor_data *sdata = iio_priv(indio_dev);
+
+ for (i = 0; i < ST_SENSORS_ODR_LIST_MAX; i++) {
+ if (sdata->sensor_settings->odr.odr_avl[i].hz == 0)
+ break;
+
+ len += scnprintf(buf + len, PAGE_SIZE - len, "%d ",
+ sdata->sensor_settings->odr.odr_avl[i].hz);
+ }
+ buf[len - 1] = '\n';
+
+ return len;
+}
+EXPORT_SYMBOL_NS(st_sensors_sysfs_sampling_frequency_avail, IIO_ST_SENSORS);
+
+ssize_t st_sensors_sysfs_scale_avail(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ int i, len = 0, q, r;
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct st_sensor_data *sdata = iio_priv(indio_dev);
+
+ for (i = 0; i < ST_SENSORS_FULLSCALE_AVL_MAX; i++) {
+ if (sdata->sensor_settings->fs.fs_avl[i].num == 0)
+ break;
+
+ q = sdata->sensor_settings->fs.fs_avl[i].gain / 1000000;
+ r = sdata->sensor_settings->fs.fs_avl[i].gain % 1000000;
+
+ len += scnprintf(buf + len, PAGE_SIZE - len, "%u.%06u ", q, r);
+ }
+ buf[len - 1] = '\n';
+
+ return len;
+}
+EXPORT_SYMBOL_NS(st_sensors_sysfs_scale_avail, IIO_ST_SENSORS);
+
+MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
+MODULE_DESCRIPTION("STMicroelectronics ST-sensors core");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/common/st_sensors/st_sensors_core.h b/drivers/iio/common/st_sensors/st_sensors_core.h
new file mode 100644
index 0000000000..09f3e602a2
--- /dev/null
+++ b/drivers/iio/common/st_sensors/st_sensors_core.h
@@ -0,0 +1,10 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Local functions in the ST Sensors core
+ */
+#ifndef __ST_SENSORS_CORE_H
+#define __ST_SENSORS_CORE_H
+struct iio_dev;
+int st_sensors_write_data_with_mask(struct iio_dev *indio_dev,
+ u8 reg_addr, u8 mask, u8 data);
+#endif
diff --git a/drivers/iio/common/st_sensors/st_sensors_i2c.c b/drivers/iio/common/st_sensors/st_sensors_i2c.c
new file mode 100644
index 0000000000..ee95082c74
--- /dev/null
+++ b/drivers/iio/common/st_sensors/st_sensors_i2c.c
@@ -0,0 +1,68 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * STMicroelectronics sensors i2c library driver
+ *
+ * Copyright 2012-2013 STMicroelectronics Inc.
+ *
+ * Denis Ciocca <denis.ciocca@st.com>
+ */
+
+#include <linux/i2c.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/iio/iio.h>
+#include <linux/regmap.h>
+
+#include <linux/iio/common/st_sensors_i2c.h>
+
+#define ST_SENSORS_I2C_MULTIREAD 0x80
+
+static const struct regmap_config st_sensors_i2c_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+};
+
+static const struct regmap_config st_sensors_i2c_regmap_multiread_bit_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .read_flag_mask = ST_SENSORS_I2C_MULTIREAD,
+};
+
+/*
+ * st_sensors_i2c_configure() - configure I2C interface
+ * @indio_dev: IIO device reference.
+ * @client: i2c client reference.
+ *
+ * Return: 0 on success, else a negative error code.
+ */
+int st_sensors_i2c_configure(struct iio_dev *indio_dev,
+ struct i2c_client *client)
+{
+ struct st_sensor_data *sdata = iio_priv(indio_dev);
+ const struct regmap_config *config;
+
+ if (sdata->sensor_settings->multi_read_bit)
+ config = &st_sensors_i2c_regmap_multiread_bit_config;
+ else
+ config = &st_sensors_i2c_regmap_config;
+
+ sdata->regmap = devm_regmap_init_i2c(client, config);
+ if (IS_ERR(sdata->regmap)) {
+ dev_err(&client->dev, "Failed to register i2c regmap (%ld)\n",
+ PTR_ERR(sdata->regmap));
+ return PTR_ERR(sdata->regmap);
+ }
+
+ i2c_set_clientdata(client, indio_dev);
+
+ indio_dev->name = client->name;
+
+ sdata->irq = client->irq;
+
+ return 0;
+}
+EXPORT_SYMBOL_NS(st_sensors_i2c_configure, IIO_ST_SENSORS);
+
+MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
+MODULE_DESCRIPTION("STMicroelectronics ST-sensors i2c driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/common/st_sensors/st_sensors_spi.c b/drivers/iio/common/st_sensors/st_sensors_spi.c
new file mode 100644
index 0000000000..63e302c3fb
--- /dev/null
+++ b/drivers/iio/common/st_sensors/st_sensors_spi.c
@@ -0,0 +1,120 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * STMicroelectronics sensors spi library driver
+ *
+ * Copyright 2012-2013 STMicroelectronics Inc.
+ *
+ * Denis Ciocca <denis.ciocca@st.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/iio/iio.h>
+#include <linux/property.h>
+#include <linux/regmap.h>
+#include <linux/spi/spi.h>
+
+#include <linux/iio/common/st_sensors_spi.h>
+
+#define ST_SENSORS_SPI_MULTIREAD 0xc0
+
+static const struct regmap_config st_sensors_spi_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+};
+
+static const struct regmap_config st_sensors_spi_regmap_multiread_bit_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .read_flag_mask = ST_SENSORS_SPI_MULTIREAD,
+};
+
+/*
+ * st_sensors_is_spi_3_wire() - check if SPI 3-wire mode has been selected
+ * @spi: spi device reference.
+ *
+ * Return: true if SPI 3-wire mode is selected, false otherwise.
+ */
+static bool st_sensors_is_spi_3_wire(struct spi_device *spi)
+{
+ struct st_sensors_platform_data *pdata;
+ struct device *dev = &spi->dev;
+
+ if (device_property_read_bool(dev, "spi-3wire"))
+ return true;
+
+ pdata = dev_get_platdata(dev);
+ if (pdata && pdata->spi_3wire)
+ return true;
+
+ return false;
+}
+
+/*
+ * st_sensors_configure_spi_3_wire() - configure SPI 3-wire if needed
+ * @spi: spi device reference.
+ * @settings: sensor specific settings reference.
+ *
+ * Return: 0 on success, else a negative error code.
+ */
+static int st_sensors_configure_spi_3_wire(struct spi_device *spi,
+ struct st_sensor_settings *settings)
+{
+ if (settings->sim.addr) {
+ u8 buffer[] = {
+ settings->sim.addr,
+ settings->sim.value
+ };
+
+ return spi_write(spi, buffer, 2);
+ }
+
+ return 0;
+}
+
+/*
+ * st_sensors_spi_configure() - configure SPI interface
+ * @indio_dev: IIO device reference.
+ * @spi: spi device reference.
+ *
+ * Return: 0 on success, else a negative error code.
+ */
+int st_sensors_spi_configure(struct iio_dev *indio_dev,
+ struct spi_device *spi)
+{
+ struct st_sensor_data *sdata = iio_priv(indio_dev);
+ const struct regmap_config *config;
+ int err;
+
+ if (st_sensors_is_spi_3_wire(spi)) {
+ err = st_sensors_configure_spi_3_wire(spi,
+ sdata->sensor_settings);
+ if (err < 0)
+ return err;
+ }
+
+ if (sdata->sensor_settings->multi_read_bit)
+ config = &st_sensors_spi_regmap_multiread_bit_config;
+ else
+ config = &st_sensors_spi_regmap_config;
+
+ sdata->regmap = devm_regmap_init_spi(spi, config);
+ if (IS_ERR(sdata->regmap)) {
+ dev_err(&spi->dev, "Failed to register spi regmap (%ld)\n",
+ PTR_ERR(sdata->regmap));
+ return PTR_ERR(sdata->regmap);
+ }
+
+ spi_set_drvdata(spi, indio_dev);
+
+ indio_dev->name = spi->modalias;
+
+ sdata->irq = spi->irq;
+
+ return 0;
+}
+EXPORT_SYMBOL_NS(st_sensors_spi_configure, IIO_ST_SENSORS);
+
+MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
+MODULE_DESCRIPTION("STMicroelectronics ST-sensors spi driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/common/st_sensors/st_sensors_trigger.c b/drivers/iio/common/st_sensors/st_sensors_trigger.c
new file mode 100644
index 0000000000..a0df9250a6
--- /dev/null
+++ b/drivers/iio/common/st_sensors/st_sensors_trigger.c
@@ -0,0 +1,242 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * STMicroelectronics sensors trigger library driver
+ *
+ * Copyright 2012-2013 STMicroelectronics Inc.
+ *
+ * Denis Ciocca <denis.ciocca@st.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/trigger.h>
+#include <linux/interrupt.h>
+#include <linux/regmap.h>
+#include <linux/iio/common/st_sensors.h>
+#include "st_sensors_core.h"
+
+/**
+ * st_sensors_new_samples_available() - check if more samples came in
+ * @indio_dev: IIO device reference.
+ * @sdata: Sensor data.
+ *
+ * returns:
+ * false - no new samples available or read error
+ * true - new samples available
+ */
+static bool st_sensors_new_samples_available(struct iio_dev *indio_dev,
+ struct st_sensor_data *sdata)
+{
+ int ret, status;
+
+ /* How would I know if I can't check it? */
+ if (!sdata->sensor_settings->drdy_irq.stat_drdy.addr)
+ return true;
+
+ /* No scan mask, no interrupt */
+ if (!indio_dev->active_scan_mask)
+ return false;
+
+ ret = regmap_read(sdata->regmap,
+ sdata->sensor_settings->drdy_irq.stat_drdy.addr,
+ &status);
+ if (ret < 0) {
+ dev_err(indio_dev->dev.parent,
+ "error checking samples available\n");
+ return false;
+ }
+
+ return !!(status & sdata->sensor_settings->drdy_irq.stat_drdy.mask);
+}
+
+/**
+ * st_sensors_irq_handler() - top half of the IRQ-based triggers
+ * @irq: irq number
+ * @p: private handler data
+ */
+static irqreturn_t st_sensors_irq_handler(int irq, void *p)
+{
+ struct iio_trigger *trig = p;
+ struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
+ struct st_sensor_data *sdata = iio_priv(indio_dev);
+
+ /* Get the time stamp as close in time as possible */
+ sdata->hw_timestamp = iio_get_time_ns(indio_dev);
+ return IRQ_WAKE_THREAD;
+}
+
+/**
+ * st_sensors_irq_thread() - bottom half of the IRQ-based triggers
+ * @irq: irq number
+ * @p: private handler data
+ */
+static irqreturn_t st_sensors_irq_thread(int irq, void *p)
+{
+ struct iio_trigger *trig = p;
+ struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
+ struct st_sensor_data *sdata = iio_priv(indio_dev);
+
+ /*
+ * If this trigger is backed by a hardware interrupt and we have a
+ * status register, check if this IRQ came from us. Notice that
+ * we will process also if st_sensors_new_samples_available()
+ * returns negative: if we can't check status, then poll
+ * unconditionally.
+ */
+ if (sdata->hw_irq_trigger &&
+ st_sensors_new_samples_available(indio_dev, sdata)) {
+ iio_trigger_poll_nested(p);
+ } else {
+ dev_dbg(indio_dev->dev.parent, "spurious IRQ\n");
+ return IRQ_NONE;
+ }
+
+ /*
+ * If we have proper level IRQs the handler will be re-entered if
+ * the line is still active, so return here and come back in through
+ * the top half if need be.
+ */
+ if (!sdata->edge_irq)
+ return IRQ_HANDLED;
+
+ /*
+ * If we are using edge IRQs, new samples arrived while processing
+ * the IRQ and those may be missed unless we pick them here, so poll
+ * again. If the sensor delivery frequency is very high, this thread
+ * turns into a polled loop handler.
+ */
+ while (sdata->hw_irq_trigger &&
+ st_sensors_new_samples_available(indio_dev, sdata)) {
+ dev_dbg(indio_dev->dev.parent,
+ "more samples came in during polling\n");
+ sdata->hw_timestamp = iio_get_time_ns(indio_dev);
+ iio_trigger_poll_nested(p);
+ }
+
+ return IRQ_HANDLED;
+}
+
+int st_sensors_allocate_trigger(struct iio_dev *indio_dev,
+ const struct iio_trigger_ops *trigger_ops)
+{
+ struct st_sensor_data *sdata = iio_priv(indio_dev);
+ struct device *parent = indio_dev->dev.parent;
+ unsigned long irq_trig;
+ int err;
+
+ sdata->trig = devm_iio_trigger_alloc(parent, "%s-trigger",
+ indio_dev->name);
+ if (sdata->trig == NULL) {
+ dev_err(&indio_dev->dev, "failed to allocate iio trigger.\n");
+ return -ENOMEM;
+ }
+
+ iio_trigger_set_drvdata(sdata->trig, indio_dev);
+ sdata->trig->ops = trigger_ops;
+
+ irq_trig = irqd_get_trigger_type(irq_get_irq_data(sdata->irq));
+ /*
+ * If the IRQ is triggered on falling edge, we need to mark the
+ * interrupt as active low, if the hardware supports this.
+ */
+ switch(irq_trig) {
+ case IRQF_TRIGGER_FALLING:
+ case IRQF_TRIGGER_LOW:
+ if (!sdata->sensor_settings->drdy_irq.addr_ihl) {
+ dev_err(&indio_dev->dev,
+ "falling/low specified for IRQ but hardware supports only rising/high: will request rising/high\n");
+ if (irq_trig == IRQF_TRIGGER_FALLING)
+ irq_trig = IRQF_TRIGGER_RISING;
+ if (irq_trig == IRQF_TRIGGER_LOW)
+ irq_trig = IRQF_TRIGGER_HIGH;
+ } else {
+ /* Set up INT active low i.e. falling edge */
+ err = st_sensors_write_data_with_mask(indio_dev,
+ sdata->sensor_settings->drdy_irq.addr_ihl,
+ sdata->sensor_settings->drdy_irq.mask_ihl, 1);
+ if (err < 0)
+ return err;
+ dev_info(&indio_dev->dev,
+ "interrupts on the falling edge or active low level\n");
+ }
+ break;
+ case IRQF_TRIGGER_RISING:
+ dev_info(&indio_dev->dev,
+ "interrupts on the rising edge\n");
+ break;
+ case IRQF_TRIGGER_HIGH:
+ dev_info(&indio_dev->dev,
+ "interrupts active high level\n");
+ break;
+ default:
+ /* This is the most preferred mode, if possible */
+ dev_err(&indio_dev->dev,
+ "unsupported IRQ trigger specified (%lx), enforce rising edge\n", irq_trig);
+ irq_trig = IRQF_TRIGGER_RISING;
+ }
+
+ /* Tell the interrupt handler that we're dealing with edges */
+ if (irq_trig == IRQF_TRIGGER_FALLING ||
+ irq_trig == IRQF_TRIGGER_RISING) {
+ if (!sdata->sensor_settings->drdy_irq.stat_drdy.addr) {
+ dev_err(&indio_dev->dev,
+ "edge IRQ not supported w/o stat register.\n");
+ return -EOPNOTSUPP;
+ }
+ sdata->edge_irq = true;
+ } else {
+ /*
+ * If we're not using edges (i.e. level interrupts) we
+ * just mask off the IRQ, handle one interrupt, then
+ * if the line is still low, we return to the
+ * interrupt handler top half again and start over.
+ */
+ irq_trig |= IRQF_ONESHOT;
+ }
+
+ /*
+ * If the interrupt pin is Open Drain, by definition this
+ * means that the interrupt line may be shared with other
+ * peripherals. But to do this we also need to have a status
+ * register and mask to figure out if this sensor was firing
+ * the IRQ or not, so we can tell the interrupt handle that
+ * it was "our" interrupt.
+ */
+ if (sdata->int_pin_open_drain &&
+ sdata->sensor_settings->drdy_irq.stat_drdy.addr)
+ irq_trig |= IRQF_SHARED;
+
+ err = devm_request_threaded_irq(parent,
+ sdata->irq,
+ st_sensors_irq_handler,
+ st_sensors_irq_thread,
+ irq_trig,
+ sdata->trig->name,
+ sdata->trig);
+ if (err) {
+ dev_err(&indio_dev->dev, "failed to request trigger IRQ.\n");
+ return err;
+ }
+
+ err = devm_iio_trigger_register(parent, sdata->trig);
+ if (err < 0) {
+ dev_err(&indio_dev->dev, "failed to register iio trigger.\n");
+ return err;
+ }
+ indio_dev->trig = iio_trigger_get(sdata->trig);
+
+ return 0;
+}
+EXPORT_SYMBOL_NS(st_sensors_allocate_trigger, IIO_ST_SENSORS);
+
+int st_sensors_validate_device(struct iio_trigger *trig,
+ struct iio_dev *indio_dev)
+{
+ struct iio_dev *indio = iio_trigger_get_drvdata(trig);
+
+ if (indio != indio_dev)
+ return -EINVAL;
+
+ return 0;
+}
+EXPORT_SYMBOL_NS(st_sensors_validate_device, IIO_ST_SENSORS);