iio: cros_ec: Add cros_ec barometer driver (d732248f) · Commits · e / devices / android_kernel_fairphone_FP4

drivers/iio/pressure/Kconfig

+10 −0

Original line number	Diff line number	Diff line
		@@ -42,6 +42,16 @@ config BMP280_SPI
		depends on SPI_MASTER
		select REGMAP

		config IIO_CROS_EC_BARO
		tristate "ChromeOS EC Barometer Sensor"
		depends on IIO_CROS_EC_SENSORS_CORE
		help
		Say yes here to build support for the Barometer sensor when
		presented by the ChromeOS EC Sensor hub.

		To compile this driver as a module, choose M here: the module
		will be called cros_ec_baro.

		config HID_SENSOR_PRESS
		depends on HID_SENSOR_HUB
		select IIO_BUFFER

drivers/iio/pressure/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -8,6 +8,7 @@ obj-$(CONFIG_BMP280) += bmp280.o
		bmp280-objs := bmp280-core.o bmp280-regmap.o
		obj-$(CONFIG_BMP280_I2C) += bmp280-i2c.o
		obj-$(CONFIG_BMP280_SPI) += bmp280-spi.o
		obj-$(CONFIG_IIO_CROS_EC_BARO) += cros_ec_baro.o
		obj-$(CONFIG_HID_SENSOR_PRESS) += hid-sensor-press.o
		obj-$(CONFIG_HP03) += hp03.o
		obj-$(CONFIG_MPL115) += mpl115.o

drivers/iio/pressure/cros_ec_baro.c

0 → 100644

+220 −0

Original line number	Diff line number	Diff line
		/*
		* cros_ec_baro - Driver for barometer sensor behind CrosEC.
		*
		* Copyright (C) 2017 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/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/mfd/cros_ec.h>
		#include <linux/mfd/cros_ec_commands.h>
		#include <linux/module.h>
		#include <linux/slab.h>
		#include <linux/platform_device.h>

		#include "../common/cros_ec_sensors/cros_ec_sensors_core.h"

		/*
		* One channel for pressure, the other for timestamp.
		*/
		#define CROS_EC_BARO_MAX_CHANNELS (1 + 1)

		/* State data for ec_sensors iio driver. */
		struct cros_ec_baro_state {
		/* Shared by all sensors */
		struct cros_ec_sensors_core_state core;

		struct iio_chan_spec channels[CROS_EC_BARO_MAX_CHANNELS];
		};

		static int cros_ec_baro_read(struct iio_dev *indio_dev,
		struct iio_chan_spec const *chan,
		int val, int val2, long mask)
		{
		struct cros_ec_baro_state *st = iio_priv(indio_dev);
		u16 data = 0;
		int ret = IIO_VAL_INT;
		int idx = chan->scan_index;

		mutex_lock(&st->core.cmd_lock);

		switch (mask) {
		case IIO_CHAN_INFO_RAW:
		if (cros_ec_sensors_read_cmd(indio_dev, 1 << idx,
		(s16 *)&data) < 0)
		ret = -EIO;
		*val = data;
		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;

		if (cros_ec_motion_send_host_cmd(&st->core, 0)) {
		ret = -EIO;
		break;
		}
		*val = st->core.resp->sensor_range.ret;

		/* scale * in_pressure_raw --> kPa */
		*val2 = 10 << CROS_EC_SENSOR_BITS;
		ret = IIO_VAL_FRACTIONAL;
		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_baro_write(struct iio_dev *indio_dev,
		struct iio_chan_spec const *chan,
		int val, int val2, long mask)
		{
		struct cros_ec_baro_state *st = iio_priv(indio_dev);
		int ret = 0;

		mutex_lock(&st->core.cmd_lock);

		switch (mask) {
		case IIO_CHAN_INFO_SCALE:
		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;

		if (cros_ec_motion_send_host_cmd(&st->core, 0))
		ret = -EIO;
		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 cros_ec_baro_info = {
		.read_raw = &cros_ec_baro_read,
		.write_raw = &cros_ec_baro_write,
		.driver_module = THIS_MODULE,
		};

		static int cros_ec_baro_probe(struct platform_device *pdev)
		{
		struct device *dev = &pdev->dev;
		struct cros_ec_dev *ec_dev = dev_get_drvdata(dev->parent);
		struct cros_ec_device *ec_device;
		struct iio_dev *indio_dev;
		struct cros_ec_baro_state *state;
		struct iio_chan_spec *channel;
		int ret;

		if (!ec_dev \|\| !ec_dev->ec_dev) {
		dev_warn(dev, "No CROS EC device found.\n");
		return -EINVAL;
		}
		ec_device = ec_dev->ec_dev;

		indio_dev = devm_iio_device_alloc(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 = &cros_ec_baro_info;
		state = iio_priv(indio_dev);
		state->core.type = state->core.resp->info.type;
		state->core.loc = state->core.resp->info.location;
		channel = state->channels;
		/* Common part */
		channel->info_mask_separate = BIT(IIO_CHAN_INFO_RAW);
		channel->info_mask_shared_by_all =
		BIT(IIO_CHAN_INFO_SCALE) \|
		BIT(IIO_CHAN_INFO_SAMP_FREQ) \|
		BIT(IIO_CHAN_INFO_FREQUENCY);
		channel->scan_type.realbits = CROS_EC_SENSOR_BITS;
		channel->scan_type.storagebits = CROS_EC_SENSOR_BITS;
		channel->scan_type.shift = 0;
		channel->scan_index = 0;
		channel->ext_info = cros_ec_sensors_ext_info;
		channel->scan_type.sign = 'u';

		state->core.calib[0] = 0;

		/* Sensor specific */
		switch (state->core.type) {
		case MOTIONSENSE_TYPE_BARO:
		channel->type = IIO_PRESSURE;
		break;
		default:
		dev_warn(dev, "Unknown motion sensor\n");
		return -EINVAL;
		}

		/* Timestamp */
		channel++;
		channel->type = IIO_TIMESTAMP;
		channel->channel = -1;
		channel->scan_index = 1;
		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_BARO_MAX_CHANNELS;

		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_baro_ids[] = {
		{
		.name = "cros-ec-baro",
		},
		{ /* sentinel */ }
		};
		MODULE_DEVICE_TABLE(platform, cros_ec_baro_ids);

		static struct platform_driver cros_ec_baro_platform_driver = {
		.driver = {
		.name = "cros-ec-baro",
		},
		.probe = cros_ec_baro_probe,
		.id_table = cros_ec_baro_ids,
		};
		module_platform_driver(cros_ec_baro_platform_driver);

		MODULE_DESCRIPTION("ChromeOS EC barometer sensor driver");
		MODULE_LICENSE("GPL v2");

drivers/platform/chrome/cros_ec_dev.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -328,6 +328,9 @@ static void cros_ec_sensors_register(struct cros_ec_dev *ec)
		case MOTIONSENSE_TYPE_ACCEL:
		sensor_cells[id].name = "cros-ec-accel";
		break;
		case MOTIONSENSE_TYPE_BARO:
		sensor_cells[id].name = "cros-ec-baro";
		break;
		case MOTIONSENSE_TYPE_GYRO:
		sensor_cells[id].name = "cros-ec-gyro";
		break;

include/linux/mfd/cros_ec_commands.h

+2 −1

Original line number	Diff line number	Diff line
		@@ -1441,7 +1441,8 @@ enum motionsensor_type {
		MOTIONSENSE_TYPE_PROX = 3,
		MOTIONSENSE_TYPE_LIGHT = 4,
		MOTIONSENSE_TYPE_ACTIVITY = 5,
		MOTIONSENSE_TYPE_MAX
		MOTIONSENSE_TYPE_BARO = 6,
		MOTIONSENSE_TYPE_MAX,
		};

		/* List of motion sensor locations. */