diff options
Diffstat (limited to 'drivers/iio/common/cros_ec_sensors/cros_ec_lid_angle.c')
-rw-r--r-- | drivers/iio/common/cros_ec_sensors/cros_ec_lid_angle.c | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/drivers/iio/common/cros_ec_sensors/cros_ec_lid_angle.c b/drivers/iio/common/cros_ec_sensors/cros_ec_lid_angle.c new file mode 100644 index 0000000000..119acb078a --- /dev/null +++ b/drivers/iio/common/cros_ec_sensors/cros_ec_lid_angle.c @@ -0,0 +1,138 @@ +// SPDX-License-Identifier: GPL-2.0 + +/* + * cros_ec_lid_angle - Driver for CrOS EC lid angle sensor. + * + * Copyright 2018 Google, Inc + * + * This driver uses the cros-ec interface to communicate with the Chrome OS + * EC about counter sensors. Counters are presented through + * iio sysfs. + */ + +#include <linux/delay.h> +#include <linux/device.h> +#include <linux/iio/buffer.h> +#include <linux/iio/common/cros_ec_sensors_core.h> +#include <linux/iio/iio.h> +#include <linux/iio/kfifo_buf.h> +#include <linux/iio/trigger.h> +#include <linux/iio/triggered_buffer.h> +#include <linux/iio/trigger_consumer.h> +#include <linux/kernel.h> +#include <linux/mod_devicetable.h> +#include <linux/module.h> +#include <linux/platform_data/cros_ec_commands.h> +#include <linux/platform_device.h> +#include <linux/slab.h> + +#define DRV_NAME "cros-ec-lid-angle" + +/* + * One channel for the lid angle, the other for timestamp. + */ +static const struct iio_chan_spec cros_ec_lid_angle_channels[] = { + { + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), + .scan_type.realbits = CROS_EC_SENSOR_BITS, + .scan_type.storagebits = CROS_EC_SENSOR_BITS, + .scan_type.sign = 'u', + .type = IIO_ANGL + }, + IIO_CHAN_SOFT_TIMESTAMP(1) +}; + +/* State data for ec_sensors iio driver. */ +struct cros_ec_lid_angle_state { + /* Shared by all sensors */ + struct cros_ec_sensors_core_state core; +}; + +static int cros_ec_sensors_read_lid_angle(struct iio_dev *indio_dev, + unsigned long scan_mask, s16 *data) +{ + struct cros_ec_sensors_core_state *st = iio_priv(indio_dev); + int ret; + + st->param.cmd = MOTIONSENSE_CMD_LID_ANGLE; + ret = cros_ec_motion_send_host_cmd(st, sizeof(st->resp->lid_angle)); + if (ret) { + dev_warn(&indio_dev->dev, "Unable to read lid angle\n"); + return ret; + } + + *data = st->resp->lid_angle.value; + return 0; +} + +static int cros_ec_lid_angle_read(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, int *val2, long mask) +{ + struct cros_ec_lid_angle_state *st = iio_priv(indio_dev); + s16 data; + int ret; + + mutex_lock(&st->core.cmd_lock); + ret = cros_ec_sensors_read_lid_angle(indio_dev, 1, &data); + if (ret == 0) { + *val = data; + ret = IIO_VAL_INT; + } + mutex_unlock(&st->core.cmd_lock); + return ret; +} + +static const struct iio_info cros_ec_lid_angle_info = { + .read_raw = &cros_ec_lid_angle_read, +}; + +static int cros_ec_lid_angle_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct iio_dev *indio_dev; + struct cros_ec_lid_angle_state *state; + int ret; + + indio_dev = devm_iio_device_alloc(dev, sizeof(*state)); + if (!indio_dev) + return -ENOMEM; + + ret = cros_ec_sensors_core_init(pdev, indio_dev, false, NULL); + if (ret) + return ret; + + indio_dev->info = &cros_ec_lid_angle_info; + state = iio_priv(indio_dev); + indio_dev->channels = cros_ec_lid_angle_channels; + indio_dev->num_channels = ARRAY_SIZE(cros_ec_lid_angle_channels); + + state->core.read_ec_sensors_data = cros_ec_sensors_read_lid_angle; + + ret = devm_iio_triggered_buffer_setup(dev, indio_dev, NULL, + cros_ec_sensors_capture, NULL); + if (ret) + return ret; + + return cros_ec_sensors_core_register(dev, indio_dev, NULL); +} + +static const struct platform_device_id cros_ec_lid_angle_ids[] = { + { + .name = DRV_NAME, + }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(platform, cros_ec_lid_angle_ids); + +static struct platform_driver cros_ec_lid_angle_platform_driver = { + .driver = { + .name = DRV_NAME, + }, + .probe = cros_ec_lid_angle_probe, + .id_table = cros_ec_lid_angle_ids, +}; +module_platform_driver(cros_ec_lid_angle_platform_driver); + +MODULE_DESCRIPTION("ChromeOS EC driver for reporting convertible lid angle."); +MODULE_LICENSE("GPL v2"); |