diff options
Diffstat (limited to 'drivers/iio/common')
30 files changed, 5646 insertions, 0 deletions
diff --git a/drivers/iio/common/Kconfig b/drivers/iio/common/Kconfig new file mode 100644 index 000000000..e108996a9 --- /dev/null +++ b/drivers/iio/common/Kconfig @@ -0,0 +1,9 @@ +# +# IIO common modules +# + +source "drivers/iio/common/cros_ec_sensors/Kconfig" +source "drivers/iio/common/hid-sensors/Kconfig" +source "drivers/iio/common/ms_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 000000000..4bc30bb54 --- /dev/null +++ b/drivers/iio/common/Makefile @@ -0,0 +1,15 @@ +# 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 += ms_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 000000000..135f68259 --- /dev/null +++ b/drivers/iio/common/cros_ec_sensors/Kconfig @@ -0,0 +1,22 @@ +# +# Chrome OS Embedded Controller managed sensors library +# +config IIO_CROS_EC_SENSORS_CORE + tristate "ChromeOS EC Sensors Core" + depends on SYSFS && MFD_CROS_EC + 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. diff --git a/drivers/iio/common/cros_ec_sensors/Makefile b/drivers/iio/common/cros_ec_sensors/Makefile new file mode 100644 index 000000000..ec716ff2a --- /dev/null +++ b/drivers/iio/common/cros_ec_sensors/Makefile @@ -0,0 +1,6 @@ +# +# 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 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 000000000..8d76afb87 --- /dev/null +++ b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c @@ -0,0 +1,300 @@ +/* + * cros_ec_sensors - Driver for Chrome OS Embedded Controller sensors. + * + * Copyright (C) 2016 Google, Inc + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * 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/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_consumer.h> +#include <linux/iio/triggered_buffer.h> +#include <linux/kernel.h> +#include <linux/mfd/cros_ec.h> +#include <linux/mfd/cros_ec_commands.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/slab.h> +#include <linux/sysfs.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] = + st->core.resp->sensor_offset.offset[i]; + ret = IIO_VAL_INT; + *val = st->core.calib[idx]; + 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] = 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]; + 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_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); + 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, +}; + +static int cros_ec_sensors_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct cros_ec_dev *ec_dev = dev_get_drvdata(dev->parent); + struct iio_dev *indio_dev; + struct cros_ec_sensors_state *state; + struct iio_chan_spec *channel; + int ret, i; + + if (!ec_dev || !ec_dev->ec_dev) { + dev_warn(&pdev->dev, "No CROS EC device found.\n"); + return -EINVAL; + } + + 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); + 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); + channel->info_mask_shared_by_all = + BIT(IIO_CHAN_INFO_SCALE) | + BIT(IIO_CHAN_INFO_FREQUENCY) | + 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; + + ret = devm_iio_triggered_buffer_setup(dev, indio_dev, NULL, + cros_ec_sensors_capture, NULL); + if (ret) + return ret; + + return devm_iio_device_register(dev, indio_dev); +} + +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 000000000..414cc43c2 --- /dev/null +++ b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c @@ -0,0 +1,496 @@ +/* + * cros_ec_sensors_core - Common function for Chrome OS EC sensor driver. + * + * Copyright (C) 2016 Google, Inc + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#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_consumer.h> +#include <linux/kernel.h> +#include <linux/mfd/cros_ec.h> +#include <linux/mfd/cros_ec_commands.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/sysfs.h> +#include <linux/platform_device.h> + +static char *cros_ec_loc[] = { + [MOTIONSENSE_LOC_BASE] = "base", + [MOTIONSENSE_LOC_LID] = "lid", + [MOTIONSENSE_LOC_MAX] = "unknown", +}; + +int cros_ec_sensors_core_init(struct platform_device *pdev, + struct iio_dev *indio_dev, + bool physical_device) +{ + struct device *dev = &pdev->dev; + struct cros_ec_sensors_core_state *state = iio_priv(indio_dev); + struct cros_ec_dev *ec = dev_get_drvdata(pdev->dev.parent); + struct cros_ec_sensor_platform *sensor_platform = dev_get_platdata(dev); + + platform_set_drvdata(pdev, indio_dev); + + state->ec = ec->ec_dev; + state->msg = devm_kzalloc(&pdev->dev, + 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); + + /* Set up the host command structure. */ + state->msg->version = 2; + state->msg->command = EC_CMD_MOTION_SENSE_CMD + ec->cmd_offset; + state->msg->outsize = sizeof(struct ec_params_motion_sense); + + indio_dev->dev.parent = &pdev->dev; + indio_dev->name = pdev->name; + + if (physical_device) { + indio_dev->modes = INDIO_DIRECT_MODE; + + state->param.cmd = MOTIONSENSE_CMD_INFO; + state->param.info.sensor_num = sensor_platform->sensor_num; + if (cros_ec_motion_send_host_cmd(state, 0)) { + dev_warn(dev, "Can not access sensor info\n"); + return -EIO; + } + state->type = state->resp->info.type; + state->loc = state->resp->info.location; + } + + return 0; +} +EXPORT_SYMBOL_GPL(cros_ec_sensors_core_init); + +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 -EIO; + + 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 = strtobool(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] = st->resp->perform_calib.offset[i]; + } + mutex_unlock(&st->cmd_lock); + + return ret ? ret : len; +} + +static ssize_t cros_ec_sensors_loc(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, "%s\n", cros_ec_loc[st->loc]); +} + +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 = "location", + .shared = IIO_SHARED_BY_ALL, + .read = cros_ec_sensors_loc + }, + { }, +}; +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; +} + +/** + * read_ec_sensors_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++; + } + + return 0; +} + +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); + +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); + +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); + +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 = IIO_VAL_INT; + + switch (mask) { + case IIO_CHAN_INFO_SAMP_FREQ: + st->param.cmd = MOTIONSENSE_CMD_EC_RATE; + st->param.ec_rate.data = + EC_MOTION_SENSE_NO_VALUE; + + if (cros_ec_motion_send_host_cmd(st, 0)) + ret = -EIO; + else + *val = st->resp->ec_rate.ret; + break; + case IIO_CHAN_INFO_FREQUENCY: + st->param.cmd = MOTIONSENSE_CMD_SENSOR_ODR; + st->param.sensor_odr.data = + EC_MOTION_SENSE_NO_VALUE; + + if (cros_ec_motion_send_host_cmd(st, 0)) + ret = -EIO; + else + *val = st->resp->sensor_odr.ret; + break; + default: + break; + } + + return ret; +} +EXPORT_SYMBOL_GPL(cros_ec_sensors_core_read); + +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 = 0; + + switch (mask) { + case IIO_CHAN_INFO_FREQUENCY: + st->param.cmd = MOTIONSENSE_CMD_SENSOR_ODR; + st->param.sensor_odr.data = val; + + /* Always roundup, so caller gets at least what it asks for. */ + st->param.sensor_odr.roundup = 1; + + if (cros_ec_motion_send_host_cmd(st, 0)) + ret = -EIO; + break; + case IIO_CHAN_INFO_SAMP_FREQ: + st->param.cmd = MOTIONSENSE_CMD_EC_RATE; + st->param.ec_rate.data = val; + + if (cros_ec_motion_send_host_cmd(st, 0)) + ret = -EIO; + else + st->curr_sampl_freq = val; + break; + default: + ret = -EINVAL; + break; + } + return ret; +} +EXPORT_SYMBOL_GPL(cros_ec_sensors_core_write); + +static int __maybe_unused cros_ec_sensors_prepare(struct device *dev) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct cros_ec_sensors_core_state *st = iio_priv(indio_dev); + + if (st->curr_sampl_freq == 0) + return 0; + + /* + * If the sensors are sampled at high frequency, we will not be able to + * sleep. Set sampling to a long period if necessary. + */ + if (st->curr_sampl_freq < CROS_EC_MIN_SUSPEND_SAMPLING_FREQUENCY) { + mutex_lock(&st->cmd_lock); + st->param.cmd = MOTIONSENSE_CMD_EC_RATE; + st->param.ec_rate.data = CROS_EC_MIN_SUSPEND_SAMPLING_FREQUENCY; + cros_ec_motion_send_host_cmd(st, 0); + mutex_unlock(&st->cmd_lock); + } + return 0; +} + +static void __maybe_unused cros_ec_sensors_complete(struct device *dev) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct cros_ec_sensors_core_state *st = iio_priv(indio_dev); + + if (st->curr_sampl_freq == 0) + return; + + if (st->curr_sampl_freq < CROS_EC_MIN_SUSPEND_SAMPLING_FREQUENCY) { + mutex_lock(&st->cmd_lock); + st->param.cmd = MOTIONSENSE_CMD_EC_RATE; + st->param.ec_rate.data = st->curr_sampl_freq; + cros_ec_motion_send_host_cmd(st, 0); + mutex_unlock(&st->cmd_lock); + } +} + +const struct dev_pm_ops cros_ec_sensors_pm_ops = { +#ifdef CONFIG_PM_SLEEP + .prepare = cros_ec_sensors_prepare, + .complete = cros_ec_sensors_complete +#endif +}; +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 000000000..80105378b --- /dev/null +++ b/drivers/iio/common/hid-sensors/Kconfig @@ -0,0 +1,28 @@ +# +# 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 + 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 000000000..22e7c5a82 --- /dev/null +++ b/drivers/iio/common/hid-sensors/Makefile @@ -0,0 +1,7 @@ +# +# 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 000000000..ed3849d6f --- /dev/null +++ b/drivers/iio/common/hid-sensors/hid-sensor-attributes.c @@ -0,0 +1,522 @@ +/* + * HID Sensors Driver + * Copyright (c) 2012, Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. + * + */ +#include <linux/device.h> +#include <linux/platform_device.h> +#include <linux/module.h> +#include <linux/interrupt.h> +#include <linux/irq.h> +#include <linux/slab.h> +#include <linux/hid-sensor-hub.h> +#include <linux/iio/iio.h> +#include <linux/iio/sysfs.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}, +}; + +static int pow_10(unsigned power) +{ + int i; + int ret = 1; + for (i = 0; i < power; ++i) + ret = ret * 10; + + return ret; +} + +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) * pow_10(6-exp); + } +} + +static void split_micro_fraction(unsigned int no, int exp, int *val1, int *val2) +{ + *val1 = no/pow_10(exp); + *val2 = no%pow_10(exp) * 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 * 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) +{ + u32 value; + int sign = 1; + + if (val1 < 0 || val2 < 0) + sign = -1; + exp = hid_sensor_convert_exponent(exp); + if (exp < 0) { + value = abs(val1) * pow_10(-exp); + value += abs(val2) / pow_10(6+exp); + } else + value = abs(val1) / pow_10(exp); + 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(hid_sensor_read_poll_value); + +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(hid_sensor_read_samp_freq_value); + +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 * pow_10(6) + val2; + if (value) { + if (st->poll.units == HID_USAGE_SENSOR_UNITS_MILLISECOND) + value = pow_10(9)/value; + else if (st->poll.units == HID_USAGE_SENSOR_UNITS_SECOND) + value = pow_10(6)/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(hid_sensor_write_samp_freq_value); + +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(hid_sensor_read_raw_hyst_value); + +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(hid_sensor_write_raw_hyst_value); + +/* + * 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 i; + int x; + int res; + int rem; + + if (exp > 0) { + *val0 = scale0 * pow_10(exp); + res = 0; + if (exp > 9) { + *val1 = 0; + return; + } + for (i = 0; i < exp; ++i) { + x = scale1 / pow_10(8 - i); + res += (pow_10(exp - 1 - i) * x); + scale1 = scale1 % pow_10(8 - i); + } + *val0 += res; + *val1 = scale1 * pow_10(exp); + } else if (exp < 0) { + exp = abs(exp); + if (exp > 9) { + *val0 = *val1 = 0; + return; + } + *val0 = scale0 / pow_10(exp); + rem = scale0 % pow_10(exp); + res = 0; + for (i = 0; i < (9 - exp); ++i) { + x = scale1 / pow_10(8 - i); + res += (pow_10(8 - exp - i) * x); + scale1 = scale1 % pow_10(8 - i); + } + *val1 = rem * 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(hid_sensor_format_scale); + +int64_t hid_sensor_convert_timestamp(struct hid_sensor_common *st, + int64_t raw_value) +{ + return st->timestamp_ns_scale * raw_value; +} +EXPORT_SYMBOL(hid_sensor_convert_timestamp); + +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(hid_sensor_get_report_latency); + +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(hid_sensor_set_report_latency); + +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(hid_sensor_batch_mode_supported); + +int hid_sensor_parse_common_attributes(struct hid_sensor_hub_device *hsdev, + u32 usage_id, + struct hid_sensor_common *st) +{ + + struct hid_sensor_hub_attribute_info timestamp; + s32 value; + int ret; + + 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); + + st->raw_hystersis = -1; + + sensor_hub_input_get_attribute_info(hsdev, + HID_INPUT_REPORT, usage_id, + HID_USAGE_SENSOR_TIME_TIMESTAMP, + ×tamp); + if (timestamp.index >= 0 && timestamp.report_id) { + int val0, val1; + + hid_sensor_format_scale(HID_USAGE_SENSOR_TIME_TIMESTAMP, + ×tamp, &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(hid_sensor_parse_common_attributes); + +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 000000000..1e10c0af2 --- /dev/null +++ b/drivers/iio/common/hid-sensors/hid-sensor-trigger.c @@ -0,0 +1,337 @@ +/* + * HID Sensors Driver + * Copyright (c) 2012, Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. + * + */ +#include <linux/device.h> +#include <linux/platform_device.h> +#include <linux/module.h> +#include <linux/interrupt.h> +#include <linux/irq.h> +#include <linux/slab.h> +#include <linux/delay.h> +#include <linux/hid-sensor-hub.h> +#include <linux/iio/iio.h> +#include <linux/iio/trigger.h> +#include <linux/iio/buffer.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 attribute *hid_sensor_fifo_attributes[] = { + &iio_dev_attr_hwfifo_timeout.dev_attr.attr, + &iio_dev_attr_hwfifo_enabled.dev_attr.attr, + NULL, +}; + +static void hid_sensor_setup_batch_mode(struct iio_dev *indio_dev, + struct hid_sensor_common *st) +{ + if (!hid_sensor_batch_mode_supported(st)) + return; + + iio_buffer_set_attrs(indio_dev->buffer, hid_sensor_fifo_attributes); +} + +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(hid_sensor_power_state); + +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_get_sync(&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) { + if (state) + pm_runtime_put_noidle(&st->pdev->dev); + 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 hid_sensor_common *attrb) +{ + if (atomic_read(&attrb->runtime_pm_enable)) + pm_runtime_disable(&attrb->pdev->dev); + + pm_runtime_set_suspended(&attrb->pdev->dev); + pm_runtime_put_noidle(&attrb->pdev->dev); + + cancel_work_sync(&attrb->work); + iio_trigger_unregister(attrb->trigger); + iio_trigger_free(attrb->trigger); +} +EXPORT_SYMBOL(hid_sensor_remove_trigger); + +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) +{ + int ret; + struct iio_trigger *trig; + + trig = iio_trigger_alloc("%s-dev%d", name, indio_dev->id); + if (trig == NULL) { + dev_err(&indio_dev->dev, "Trigger Allocate Failed\n"); + ret = -ENOMEM; + goto error_ret; + } + + trig->dev.parent = indio_dev->dev.parent; + 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); + + hid_sensor_setup_batch_mode(indio_dev, attrb); + + 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_ret: + return ret; +} +EXPORT_SYMBOL(hid_sensor_setup_trigger); + +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(hid_sensor_pm_ops); + +MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>"); +MODULE_DESCRIPTION("HID Sensor trigger processing"); +MODULE_LICENSE("GPL"); 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 000000000..9f4713f42 --- /dev/null +++ b/drivers/iio/common/hid-sensors/hid-sensor-trigger.h @@ -0,0 +1,32 @@ +/* + * HID Sensors Driver + * Copyright (c) 2012, Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. + * + */ +#ifndef _HID_SENSOR_TRIGGER_H +#define _HID_SENSOR_TRIGGER_H + +#include <linux/pm.h> +#include <linux/pm_runtime.h> + +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 hid_sensor_common *attrb); +int hid_sensor_power_state(struct hid_sensor_common *st, bool state); + +#endif diff --git a/drivers/iio/common/ms_sensors/Kconfig b/drivers/iio/common/ms_sensors/Kconfig new file mode 100644 index 000000000..b28a92b97 --- /dev/null +++ b/drivers/iio/common/ms_sensors/Kconfig @@ -0,0 +1,6 @@ +# +# 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 000000000..7846428ab --- /dev/null +++ b/drivers/iio/common/ms_sensors/Makefile @@ -0,0 +1,5 @@ +# +# 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 000000000..125b5ff61 --- /dev/null +++ b/drivers/iio/common/ms_sensors/ms_sensors_i2c.c @@ -0,0 +1,652 @@ +/* + * Measurements Specialties driver common i2c functions + * + * Copyright (c) 2015 Measurement-Specialties + * + * Licensed under the GPL-2. + */ + +#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, 3000, + 5000, 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(ms_sensors_reset); + +/** + * 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(ms_sensors_read_prom_word); + +/** + * 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(ms_sensors_convert_and_read); + +/** + * 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 + * @cli: 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(ms_sensors_read_serial); + +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(ms_sensors_write_resolution); + +/** + * 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 sprintf(buf, "%d\n", (config_reg & 0x40) >> 6); +} +EXPORT_SYMBOL(ms_sensors_show_battery_low); + +/** + * 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 sprintf(buf, "%d\n", (config_reg & 0x4) >> 2); +} +EXPORT_SYMBOL(ms_sensors_show_heater); + +/** + * 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(ms_sensors_write_heater); + +/** + * 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(ms_sensors_ht_read_temperature); + +/** + * 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(ms_sensors_ht_read_humidity); + +/** + * ms_sensors_tp_crc_valid() - CRC check function for + * Temperature and pressure devices. + * This function is only used when reading PROM coefficients + * + * @prom: pointer to PROM coefficients array + * @len: length of PROM coefficients array + * + * Return: True if CRC is ok. + */ +static bool ms_sensors_tp_crc_valid(u16 *prom, u8 len) +{ + unsigned int cnt, n_bit; + u16 n_rem = 0x0000, crc_read = prom[0], crc = (*prom & 0xF000) >> 12; + + prom[len - 1] = 0; + prom[0] &= 0x0FFF; /* Clear the CRC computation part */ + + for (cnt = 0; cnt < len * 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; + } + } + n_rem >>= 12; + prom[0] = crc_read; + + return n_rem == crc; +} + +/** + * 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; + + for (i = 0; i < MS_SENSORS_TP_PROM_WORDS_NB; 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 (!ms_sensors_tp_crc_valid(dev_data->prom, + MS_SENSORS_TP_PROM_WORDS_NB + 1)) { + dev_err(&dev_data->client->dev, + "Calibration coefficients crc check error\n"); + return -ENODEV; + } + + return 0; +} +EXPORT_SYMBOL(ms_sensors_tp_read_prom); + +/** + * 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(ms_sensors_read_temp_and_pressure); + +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 000000000..7b614adc5 --- /dev/null +++ b/drivers/iio/common/ms_sensors/ms_sensors_i2c.h @@ -0,0 +1,66 @@ +/* + * Measurements Specialties common sensor driver + * + * Copyright (c) 2015 Measurement-Specialties + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#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 7 + +/** + * 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_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; + u16 prom[MS_SENSORS_TP_PROM_WORDS_NB + 1]; + 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/ssp_sensors/Kconfig b/drivers/iio/common/ssp_sensors/Kconfig new file mode 100644 index 000000000..0ea4faf01 --- /dev/null +++ b/drivers/iio/common/ssp_sensors/Kconfig @@ -0,0 +1,26 @@ +# +# 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 000000000..1e0389eb0 --- /dev/null +++ b/drivers/iio/common/ssp_sensors/Makefile @@ -0,0 +1,8 @@ +# +# 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 000000000..82a01addd --- /dev/null +++ b/drivers/iio/common/ssp_sensors/ssp.h @@ -0,0 +1,257 @@ +/* + * Copyright (C) 2014, Samsung Electronics Co. Ltd. All Rights Reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + */ + +#ifndef __SSP_SENSORHUB_H__ +#define __SSP_SENSORHUB_H__ + +#include <linux/delay.h> +#include <linux/gpio.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_gpio: mcu reset line + * @ap_mcu_gpio: ap to mcu gpio line + * @mcu_ap_gpio: 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; + + int mcu_reset_gpio; + int ap_mcu_gpio; + int mcu_ap_gpio; + + 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)] + ____cacheline_aligned; +}; + +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 000000000..af3aa38f6 --- /dev/null +++ b/drivers/iio/common/ssp_sensors/ssp_dev.c @@ -0,0 +1,712 @@ +/* + * Copyright (C) 2014, Samsung Electronics Co. Ltd. All Rights Reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + */ + +#include <linux/iio/iio.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/mfd/core.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_gpio.h> +#include <linux/of_platform.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) +{ + gpio_set_value(data->mcu_reset_gpio, 0); + usleep_range(1000, 1200); + gpio_set_value(data->mcu_reset_gpio, 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(ssp_get_sensor_delay); + +/** + * 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(ssp_enable_sensor); + +/** + * 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(ssp_change_delay); + +/** + * 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(ssp_disable_sensor); + +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)); +} + +#ifdef CONFIG_OF +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) +{ + int ret; + struct ssp_data *data; + struct device_node *node = dev->of_node; + const struct of_device_id *match; + + data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); + if (!data) + return NULL; + + data->mcu_ap_gpio = of_get_named_gpio(node, "mcu-ap-gpios", 0); + if (data->mcu_ap_gpio < 0) + goto err_free_pd; + + data->ap_mcu_gpio = of_get_named_gpio(node, "ap-mcu-gpios", 0); + if (data->ap_mcu_gpio < 0) + goto err_free_pd; + + data->mcu_reset_gpio = of_get_named_gpio(node, "mcu-reset-gpios", 0); + if (data->mcu_reset_gpio < 0) + goto err_free_pd; + + ret = devm_gpio_request_one(dev, data->ap_mcu_gpio, GPIOF_OUT_INIT_HIGH, + "ap-mcu-gpios"); + if (ret) + goto err_free_pd; + + ret = devm_gpio_request_one(dev, data->mcu_reset_gpio, + GPIOF_OUT_INIT_HIGH, "mcu-reset-gpios"); + if (ret) + goto err_ap_mcu; + + match = of_match_node(ssp_of_match, node); + if (!match) + goto err_mcu_reset_gpio; + + data->sensorhub_info = match->data; + + dev_set_drvdata(dev, data); + + return data; + +err_mcu_reset_gpio: + devm_gpio_free(dev, data->mcu_reset_gpio); +err_ap_mcu: + devm_gpio_free(dev, data->ap_mcu_gpio); +err_free_pd: + devm_kfree(dev, data); + return NULL; +} +#else +static struct ssp_data *ssp_parse_dt(struct device *pdev) +{ + return NULL; +} +#endif + +/** + * 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(ssp_register_consumer); + +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, -1, 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 int 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); + + return 0; +} + +#ifdef CONFIG_PM_SLEEP +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; +} +#endif /* CONFIG_PM_SLEEP */ + +static const struct dev_pm_ops ssp_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(ssp_suspend, ssp_resume) +}; + +static struct spi_driver ssp_driver = { + .probe = ssp_probe, + .remove = ssp_remove, + .driver = { + .pm = &ssp_pm_ops, + .of_match_table = of_match_ptr(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 000000000..e38f704d8 --- /dev/null +++ b/drivers/iio/common/ssp_sensors/ssp_iio.c @@ -0,0 +1,108 @@ +/* + * Copyright (C) 2014, Samsung Electronics Co. Ltd. All Rights Reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + */ + +#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(ssp_common_buffer_postenable); + +/** + * 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(ssp_common_buffer_postdisable); + +/** + * 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(ssp_common_process_data); + +MODULE_AUTHOR("Karol Wrona <k.wrona@samsung.com>"); +MODULE_DESCRIPTION("Samsung sensorhub commons"); +MODULE_LICENSE("GPL"); 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 000000000..4528ab55e --- /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 000000000..3d11cfa03 --- /dev/null +++ b/drivers/iio/common/ssp_sensors/ssp_spi.c @@ -0,0 +1,612 @@ +/* + * Copyright (C) 2014, Samsung Electronics Co. Ltd. All Rights Reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + */ + +#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; + + gpio_set_value_cansleep(data->ap_mcu_gpio, state); + + while (gpio_get_value_cansleep(data->mcu_ap_gpio) != 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) + gpio_set_value_cansleep(data->ap_mcu_gpio, 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) { + gpio_set_value_cansleep(data->ap_mcu_gpio, 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) +{ + bool found = false; + char *buffer; + u8 msg_type; + int ret; + u16 length, msg_options; + struct ssp_msg *msg, *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(msg, n, &data->pending_list, list) { + if (msg->options == msg_options) { + list_del(&msg->list); + found = true; + break; + } + } + + if (!found) { + /* + * 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 000000000..865f1ca33 --- /dev/null +++ b/drivers/iio/common/st_sensors/Kconfig @@ -0,0 +1,14 @@ +# +# STMicroelectronics sensors common library +# + +config IIO_ST_SENSORS_I2C + tristate + +config IIO_ST_SENSORS_SPI + tristate + +config IIO_ST_SENSORS_CORE + tristate + select IIO_ST_SENSORS_I2C if I2C + select IIO_ST_SENSORS_SPI if SPI_MASTER diff --git a/drivers/iio/common/st_sensors/Makefile b/drivers/iio/common/st_sensors/Makefile new file mode 100644 index 000000000..f7fb3b79b --- /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 000000000..df4045203 --- /dev/null +++ b/drivers/iio/common/st_sensors/st_sensors_buffer.c @@ -0,0 +1,89 @@ +/* + * STMicroelectronics sensors buffer library driver + * + * Copyright 2012-2013 STMicroelectronics Inc. + * + * Denis Ciocca <denis.ciocca@st.com> + * + * Licensed under the GPL-2. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/slab.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/iio/triggered_buffer.h> +#include <linux/irqreturn.h> + +#include <linux/iio/common/st_sensors.h> + + +static int st_sensors_get_buffer_element(struct iio_dev *indio_dev, u8 *buf) +{ + int i; + struct st_sensor_data *sdata = iio_priv(indio_dev); + unsigned int num_data_channels = sdata->num_data_channels; + + 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 (sdata->tf->read_multiple_byte(&sdata->tb, sdata->dev, + channel->address, + bytes_to_read, buf, + sdata->multiread_bit) < + bytes_to_read) + 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 timetamping 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(st_sensors_trigger_handler); + +MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>"); +MODULE_DESCRIPTION("STMicroelectronics ST-sensors buffer"); +MODULE_LICENSE("GPL v2"); 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 000000000..09279e40c --- /dev/null +++ b/drivers/iio/common/st_sensors/st_sensors_core.c @@ -0,0 +1,738 @@ +/* + * STMicroelectronics sensors core library driver + * + * Copyright 2012-2013 STMicroelectronics Inc. + * + * Denis Ciocca <denis.ciocca@st.com> + * + * Licensed under the GPL-2. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/delay.h> +#include <linux/iio/iio.h> +#include <linux/regulator/consumer.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <asm/unaligned.h> +#include <linux/iio/common/st_sensors.h> + +#include "st_sensors_core.h" + +static inline u32 st_sensors_get_unaligned_le24(const u8 *p) +{ + return (s32)((p[0] | p[1] << 8 | p[2] << 16) << 8) >> 8; +} + +int st_sensors_write_data_with_mask(struct iio_dev *indio_dev, + u8 reg_addr, u8 mask, u8 data) +{ + int err; + u8 new_data; + struct st_sensor_data *sdata = iio_priv(indio_dev); + + err = sdata->tf->read_byte(&sdata->tb, sdata->dev, reg_addr, &new_data); + if (err < 0) + goto st_sensors_write_data_with_mask_error; + + new_data = ((new_data & (~mask)) | ((data << __ffs(mask)) & mask)); + err = sdata->tf->write_byte(&sdata->tb, sdata->dev, reg_addr, new_data); + +st_sensors_write_data_with_mask_error: + return err; +} + +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); + u8 readdata; + int err; + + if (!readval) + return sdata->tf->write_byte(&sdata->tb, sdata->dev, + (u8)reg, (u8)writeval); + + err = sdata->tf->read_byte(&sdata->tb, sdata->dev, (u8)reg, &readdata); + if (err < 0) + return err; + + *readval = (unsigned)readdata; + + return 0; +} +EXPORT_SYMBOL(st_sensors_debugfs_reg_access); + +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; + struct st_sensor_odr_avl odr_out = {0, 0}; + struct st_sensor_data *sdata = iio_priv(indio_dev); + + if (!sdata->sensor_settings->odr.mask) + return 0; + + err = st_sensors_match_odr(sdata->sensor_settings, odr, &odr_out); + if (err < 0) + goto st_sensors_match_odr_error; + + 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; + +st_sensors_match_odr_error: + return err; +} +EXPORT_SYMBOL(st_sensors_set_odr); + +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) + goto st_sensors_match_odr_error; + + if (sensor_settings->fs.fs_avl[i].num == fs) { + *index_fs_avl = i; + ret = 0; + break; + } + } + +st_sensors_match_odr_error: + 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 = (struct st_sensor_fullscale_avl *) + &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(st_sensors_set_enable); + +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(st_sensors_set_axis_enable); + +int st_sensors_power_enable(struct iio_dev *indio_dev) +{ + struct st_sensor_data *pdata = iio_priv(indio_dev); + int err; + + /* Regulators not mandatory, but if requested we should enable them. */ + pdata->vdd = devm_regulator_get(indio_dev->dev.parent, "vdd"); + if (IS_ERR(pdata->vdd)) { + dev_err(&indio_dev->dev, "unable to get Vdd supply\n"); + return PTR_ERR(pdata->vdd); + } + err = regulator_enable(pdata->vdd); + if (err != 0) { + dev_warn(&indio_dev->dev, + "Failed to enable specified Vdd supply\n"); + return err; + } + + pdata->vdd_io = devm_regulator_get(indio_dev->dev.parent, "vddio"); + if (IS_ERR(pdata->vdd_io)) { + dev_err(&indio_dev->dev, "unable to get Vdd_IO supply\n"); + err = PTR_ERR(pdata->vdd_io); + goto st_sensors_disable_vdd; + } + err = regulator_enable(pdata->vdd_io); + if (err != 0) { + dev_warn(&indio_dev->dev, + "Failed to enable specified Vdd_IO supply\n"); + goto st_sensors_disable_vdd; + } + + return 0; + +st_sensors_disable_vdd: + regulator_disable(pdata->vdd); + return err; +} +EXPORT_SYMBOL(st_sensors_power_enable); + +void st_sensors_power_disable(struct iio_dev *indio_dev) +{ + struct st_sensor_data *pdata = iio_priv(indio_dev); + + regulator_disable(pdata->vdd); + regulator_disable(pdata->vdd_io); +} +EXPORT_SYMBOL(st_sensors_power_disable); + +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; +} + +#ifdef CONFIG_OF +static struct st_sensors_platform_data *st_sensors_of_probe(struct device *dev, + struct st_sensors_platform_data *defdata) +{ + struct st_sensors_platform_data *pdata; + struct device_node *np = dev->of_node; + u32 val; + + if (!np) + return NULL; + + pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); + if (!of_property_read_u32(np, "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 = of_property_read_bool(np, "drive-open-drain"); + + return pdata; +} + +/** + * st_sensors_of_name_probe() - device tree probe for ST sensor name + * @dev: driver model representation of the device. + * @match: the OF match table for the device, containing compatible strings + * but also a .data field with the corresponding internal kernel name + * used by this sensor. + * @name: device name buffer reference. + * @len: device name buffer length. + * + * In effect this function matches a compatible string 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_of_name_probe(struct device *dev, + const struct of_device_id *match, + char *name, int len) +{ + const struct of_device_id *of_id; + + of_id = of_match_device(match, dev); + if (!of_id || !of_id->data) + return; + + /* The name from the OF match takes precedence if present */ + strlcpy(name, of_id->data, len); +} +EXPORT_SYMBOL(st_sensors_of_name_probe); +#else +static struct st_sensors_platform_data *st_sensors_of_probe(struct device *dev, + struct st_sensors_platform_data *defdata) +{ + return NULL; +} +#endif + +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; + + /* If OF/DT pdata exists, it will take precedence of anything else */ + of_pdata = st_sensors_of_probe(indio_dev->dev.parent, 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(st_sensors_init_sensor); + +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(st_sensors_set_dataready_irq); + +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(st_sensors_set_fullscale_by_gain); + +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_KERNEL); + if (!outdata) + return -ENOMEM; + + err = sdata->tf->read_multiple_byte(&sdata->tb, sdata->dev, + ch->address, byte_for_channel, + outdata, sdata->multiread_bit); + 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)st_sensors_get_unaligned_le24(outdata); + +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); + + mutex_lock(&indio_dev->mlock); + if (indio_dev->currentmode == INDIO_BUFFER_TRIGGERED) { + err = -EBUSY; + goto out; + } else { + 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(&indio_dev->mlock); + + return err; +} +EXPORT_SYMBOL(st_sensors_read_info_raw); + +static int st_sensors_init_interface_mode(struct iio_dev *indio_dev, + const struct st_sensor_settings *sensor_settings) +{ + struct st_sensor_data *sdata = iio_priv(indio_dev); + struct device_node *np = sdata->dev->of_node; + struct st_sensors_platform_data *pdata; + + pdata = (struct st_sensors_platform_data *)sdata->dev->platform_data; + if (((np && of_property_read_bool(np, "spi-3wire")) || + (pdata && pdata->spi_3wire)) && sensor_settings->sim.addr) { + int err; + + err = sdata->tf->write_byte(&sdata->tb, sdata->dev, + sensor_settings->sim.addr, + sensor_settings->sim.value); + if (err < 0) { + dev_err(&indio_dev->dev, + "failed to init interface mode\n"); + return err; + } + } + + return 0; +} + +int st_sensors_check_device_support(struct iio_dev *indio_dev, + int num_sensors_list, + const struct st_sensor_settings *sensor_settings) +{ + int i, n, err = 0; + u8 wai; + struct st_sensor_data *sdata = iio_priv(indio_dev); + + for (i = 0; i < num_sensors_list; i++) { + for (n = 0; n < ST_SENSORS_MAX_4WAI; n++) { + if (strcmp(indio_dev->name, + sensor_settings[i].sensors_supported[n]) == 0) { + break; + } + } + if (n < ST_SENSORS_MAX_4WAI) + break; + } + if (i == num_sensors_list) { + dev_err(&indio_dev->dev, "device name %s not recognized.\n", + indio_dev->name); + return -ENODEV; + } + + err = st_sensors_init_interface_mode(indio_dev, &sensor_settings[i]); + if (err < 0) + return err; + + if (sensor_settings[i].wai_addr) { + err = sdata->tf->read_byte(&sdata->tb, sdata->dev, + sensor_settings[i].wai_addr, &wai); + if (err < 0) { + dev_err(&indio_dev->dev, + "failed to read Who-Am-I register.\n"); + return err; + } + + if (sensor_settings[i].wai != wai) { + dev_err(&indio_dev->dev, + "%s: WhoAmI mismatch (0x%x).\n", + indio_dev->name, wai); + return -EINVAL; + } + } + + sdata->sensor_settings = + (struct st_sensor_settings *)&sensor_settings[i]; + + return i; +} +EXPORT_SYMBOL(st_sensors_check_device_support); + +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_get_drvdata(dev); + struct st_sensor_data *sdata = iio_priv(indio_dev); + + mutex_lock(&indio_dev->mlock); + 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); + } + mutex_unlock(&indio_dev->mlock); + buf[len - 1] = '\n'; + + return len; +} +EXPORT_SYMBOL(st_sensors_sysfs_sampling_frequency_avail); + +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_get_drvdata(dev); + struct st_sensor_data *sdata = iio_priv(indio_dev); + + mutex_lock(&indio_dev->mlock); + 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); + } + mutex_unlock(&indio_dev->mlock); + buf[len - 1] = '\n'; + + return len; +} +EXPORT_SYMBOL(st_sensors_sysfs_scale_avail); + +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 000000000..e8894be55 --- /dev/null +++ b/drivers/iio/common/st_sensors/st_sensors_core.h @@ -0,0 +1,9 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Local functions in the ST Sensors core + */ +#ifndef __ST_SENSORS_CORE_H +#define __ST_SENSORS_CORE_H +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 000000000..b81e48e9f --- /dev/null +++ b/drivers/iio/common/st_sensors/st_sensors_i2c.c @@ -0,0 +1,103 @@ +/* + * STMicroelectronics sensors i2c library driver + * + * Copyright 2012-2013 STMicroelectronics Inc. + * + * Denis Ciocca <denis.ciocca@st.com> + * + * Licensed under the GPL-2. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/iio/iio.h> +#include <linux/of_device.h> +#include <linux/acpi.h> + +#include <linux/iio/common/st_sensors_i2c.h> + + +#define ST_SENSORS_I2C_MULTIREAD 0x80 + +static unsigned int st_sensors_i2c_get_irq(struct iio_dev *indio_dev) +{ + struct st_sensor_data *sdata = iio_priv(indio_dev); + + return to_i2c_client(sdata->dev)->irq; +} + +static int st_sensors_i2c_read_byte(struct st_sensor_transfer_buffer *tb, + struct device *dev, u8 reg_addr, u8 *res_byte) +{ + int err; + + err = i2c_smbus_read_byte_data(to_i2c_client(dev), reg_addr); + if (err < 0) + goto st_accel_i2c_read_byte_error; + + *res_byte = err & 0xff; + +st_accel_i2c_read_byte_error: + return err < 0 ? err : 0; +} + +static int st_sensors_i2c_read_multiple_byte( + struct st_sensor_transfer_buffer *tb, struct device *dev, + u8 reg_addr, int len, u8 *data, bool multiread_bit) +{ + if (multiread_bit) + reg_addr |= ST_SENSORS_I2C_MULTIREAD; + + return i2c_smbus_read_i2c_block_data_or_emulated(to_i2c_client(dev), + reg_addr, len, data); +} + +static int st_sensors_i2c_write_byte(struct st_sensor_transfer_buffer *tb, + struct device *dev, u8 reg_addr, u8 data) +{ + return i2c_smbus_write_byte_data(to_i2c_client(dev), reg_addr, data); +} + +static const struct st_sensor_transfer_function st_sensors_tf_i2c = { + .read_byte = st_sensors_i2c_read_byte, + .write_byte = st_sensors_i2c_write_byte, + .read_multiple_byte = st_sensors_i2c_read_multiple_byte, +}; + +void st_sensors_i2c_configure(struct iio_dev *indio_dev, + struct i2c_client *client, struct st_sensor_data *sdata) +{ + i2c_set_clientdata(client, indio_dev); + + indio_dev->dev.parent = &client->dev; + indio_dev->name = client->name; + + sdata->dev = &client->dev; + sdata->tf = &st_sensors_tf_i2c; + sdata->get_irq_data_ready = st_sensors_i2c_get_irq; +} +EXPORT_SYMBOL(st_sensors_i2c_configure); + +#ifdef CONFIG_ACPI +int st_sensors_match_acpi_device(struct device *dev) +{ + const struct acpi_device_id *acpi_id; + kernel_ulong_t driver_data = 0; + + if (ACPI_HANDLE(dev)) { + acpi_id = acpi_match_device(dev->driver->acpi_match_table, dev); + if (!acpi_id) { + dev_err(dev, "No driver data\n"); + return -EINVAL; + } + driver_data = acpi_id->driver_data; + } + return driver_data; +} +EXPORT_SYMBOL(st_sensors_match_acpi_device); +#endif + +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 000000000..5b377373f --- /dev/null +++ b/drivers/iio/common/st_sensors/st_sensors_spi.c @@ -0,0 +1,122 @@ +/* + * STMicroelectronics sensors spi library driver + * + * Copyright 2012-2013 STMicroelectronics Inc. + * + * Denis Ciocca <denis.ciocca@st.com> + * + * Licensed under the GPL-2. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/iio/iio.h> + +#include <linux/iio/common/st_sensors_spi.h> + + +#define ST_SENSORS_SPI_MULTIREAD 0xc0 +#define ST_SENSORS_SPI_READ 0x80 + +static unsigned int st_sensors_spi_get_irq(struct iio_dev *indio_dev) +{ + struct st_sensor_data *sdata = iio_priv(indio_dev); + + return to_spi_device(sdata->dev)->irq; +} + +static int st_sensors_spi_read(struct st_sensor_transfer_buffer *tb, + struct device *dev, u8 reg_addr, int len, u8 *data, bool multiread_bit) +{ + int err; + + struct spi_transfer xfers[] = { + { + .tx_buf = tb->tx_buf, + .bits_per_word = 8, + .len = 1, + }, + { + .rx_buf = tb->rx_buf, + .bits_per_word = 8, + .len = len, + } + }; + + mutex_lock(&tb->buf_lock); + if ((multiread_bit) && (len > 1)) + tb->tx_buf[0] = reg_addr | ST_SENSORS_SPI_MULTIREAD; + else + tb->tx_buf[0] = reg_addr | ST_SENSORS_SPI_READ; + + err = spi_sync_transfer(to_spi_device(dev), xfers, ARRAY_SIZE(xfers)); + if (err) + goto acc_spi_read_error; + + memcpy(data, tb->rx_buf, len); + mutex_unlock(&tb->buf_lock); + return len; + +acc_spi_read_error: + mutex_unlock(&tb->buf_lock); + return err; +} + +static int st_sensors_spi_read_byte(struct st_sensor_transfer_buffer *tb, + struct device *dev, u8 reg_addr, u8 *res_byte) +{ + return st_sensors_spi_read(tb, dev, reg_addr, 1, res_byte, false); +} + +static int st_sensors_spi_read_multiple_byte( + struct st_sensor_transfer_buffer *tb, struct device *dev, + u8 reg_addr, int len, u8 *data, bool multiread_bit) +{ + return st_sensors_spi_read(tb, dev, reg_addr, len, data, multiread_bit); +} + +static int st_sensors_spi_write_byte(struct st_sensor_transfer_buffer *tb, + struct device *dev, u8 reg_addr, u8 data) +{ + int err; + + struct spi_transfer xfers = { + .tx_buf = tb->tx_buf, + .bits_per_word = 8, + .len = 2, + }; + + mutex_lock(&tb->buf_lock); + tb->tx_buf[0] = reg_addr; + tb->tx_buf[1] = data; + + err = spi_sync_transfer(to_spi_device(dev), &xfers, 1); + mutex_unlock(&tb->buf_lock); + + return err; +} + +static const struct st_sensor_transfer_function st_sensors_tf_spi = { + .read_byte = st_sensors_spi_read_byte, + .write_byte = st_sensors_spi_write_byte, + .read_multiple_byte = st_sensors_spi_read_multiple_byte, +}; + +void st_sensors_spi_configure(struct iio_dev *indio_dev, + struct spi_device *spi, struct st_sensor_data *sdata) +{ + spi_set_drvdata(spi, indio_dev); + + indio_dev->dev.parent = &spi->dev; + indio_dev->name = spi->modalias; + + sdata->dev = &spi->dev; + sdata->tf = &st_sensors_tf_spi; + sdata->get_irq_data_ready = st_sensors_spi_get_irq; +} +EXPORT_SYMBOL(st_sensors_spi_configure); + +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 000000000..fdcc5a891 --- /dev/null +++ b/drivers/iio/common/st_sensors/st_sensors_trigger.c @@ -0,0 +1,262 @@ +/* + * STMicroelectronics sensors trigger library driver + * + * Copyright 2012-2013 STMicroelectronics Inc. + * + * Denis Ciocca <denis.ciocca@st.com> + * + * Licensed under the GPL-2. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/iio/iio.h> +#include <linux/iio/trigger.h> +#include <linux/interrupt.h> +#include <linux/iio/common/st_sensors.h> +#include "st_sensors_core.h" + +/** + * st_sensors_new_samples_available() - check if more samples came in + * returns: + * 0 - no new samples available + * 1 - new samples available + * negative - error or unknown + */ +static int st_sensors_new_samples_available(struct iio_dev *indio_dev, + struct st_sensor_data *sdata) +{ + u8 status; + int ret; + + /* How would I know if I can't check it? */ + if (!sdata->sensor_settings->drdy_irq.stat_drdy.addr) + return -EINVAL; + + /* No scan mask, no interrupt */ + if (!indio_dev->active_scan_mask) + return 0; + + ret = sdata->tf->read_byte(&sdata->tb, sdata->dev, + sdata->sensor_settings->drdy_irq.stat_drdy.addr, + &status); + if (ret < 0) { + dev_err(sdata->dev, + "error checking samples available\n"); + return ret; + } + + if (status & sdata->sensor_settings->drdy_irq.stat_drdy.mask) + return 1; + + return 0; +} + +/** + * 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_chained(p); + } else { + dev_dbg(sdata->dev, "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 egde 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(sdata->dev, "more samples came in during polling\n"); + sdata->hw_timestamp = iio_get_time_ns(indio_dev); + iio_trigger_poll_chained(p); + } + + return IRQ_HANDLED; +} + +int st_sensors_allocate_trigger(struct iio_dev *indio_dev, + const struct iio_trigger_ops *trigger_ops) +{ + int err, irq; + struct st_sensor_data *sdata = iio_priv(indio_dev); + unsigned long irq_trig; + + sdata->trig = iio_trigger_alloc("%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; + sdata->trig->dev.parent = sdata->dev; + + irq = sdata->get_irq_data_ready(indio_dev); + irq_trig = irqd_get_trigger_type(irq_get_irq_data(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 only support 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) + goto iio_trigger_free; + 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) + 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 = request_threaded_irq(sdata->get_irq_data_ready(indio_dev), + 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"); + goto iio_trigger_free; + } + + err = iio_trigger_register(sdata->trig); + if (err < 0) { + dev_err(&indio_dev->dev, "failed to register iio trigger.\n"); + goto iio_trigger_register_error; + } + indio_dev->trig = iio_trigger_get(sdata->trig); + + return 0; + +iio_trigger_register_error: + free_irq(sdata->get_irq_data_ready(indio_dev), sdata->trig); +iio_trigger_free: + iio_trigger_free(sdata->trig); + return err; +} +EXPORT_SYMBOL(st_sensors_allocate_trigger); + +void st_sensors_deallocate_trigger(struct iio_dev *indio_dev) +{ + struct st_sensor_data *sdata = iio_priv(indio_dev); + + iio_trigger_unregister(sdata->trig); + free_irq(sdata->get_irq_data_ready(indio_dev), sdata->trig); + iio_trigger_free(sdata->trig); +} +EXPORT_SYMBOL(st_sensors_deallocate_trigger); + +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(st_sensors_validate_device); + +MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>"); +MODULE_DESCRIPTION("STMicroelectronics ST-sensors trigger"); +MODULE_LICENSE("GPL v2"); |