| // 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/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, 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 devm_iio_device_register(dev, indio_dev); |
| } |
| |
| 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"); |