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Commit 48458b0c authored by Gwendal Grignou's avatar Gwendal Grignou Committed by Jonathan Cameron
Browse files

iio: cros_ec_light_prox: add ChromeOS EC Light and Proximity Sensors 



Handle Light and Proximity sensors presented by the ChromeOS EC Sensor hub.
Creates an IIO device for each functions.

Signed-off-by: default avatarGwendal Grignou <gwendal@chromium.org>
Signed-off-by: default avatarGuenter Roeck <groeck@chromium.org>
Signed-off-by: default avatarEnric Balletbo i Serra <enric.balletbo@collabora.com>
Signed-off-by: default avatarJonathan Cameron <jic23@kernel.org>
parent 1bf70767

drivers/iio/light/Kconfig

+10 −0
Original line number Diff line number Diff line
@@ -136,6 +136,16 @@ config CM36651 
	 To compile this driver as a module, choose M here:

	 the module will be called cm36651.



config IIO_CROS_EC_LIGHT_PROX

	tristate "ChromeOS EC Light and Proximity Sensors"

	depends on IIO_CROS_EC_SENSORS_CORE

	help

	  Say Y here if you use the light and proximity sensors

	  presented by the ChromeOS EC Sensor hub.



	  To compile this driver as a module, choose M here:

	  the module will be called cros_ec_light_prox.



config GP2AP020A00F

	tristate "Sharp GP2AP020A00F Proximity/ALS sensor"

	depends on I2C

drivers/iio/light/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -15,6 +15,7 @@ obj-$(CONFIG_CM3232) += cm3232.o 
obj-$(CONFIG_CM3323)		+= cm3323.o

obj-$(CONFIG_CM3605)		+= cm3605.o

obj-$(CONFIG_CM36651)		+= cm36651.o

obj-$(CONFIG_IIO_CROS_EC_LIGHT_PROX) += cros_ec_light_prox.o

obj-$(CONFIG_GP2AP020A00F)	+= gp2ap020a00f.o

obj-$(CONFIG_HID_SENSOR_ALS)	+= hid-sensor-als.o

obj-$(CONFIG_HID_SENSOR_PROX)	+= hid-sensor-prox.o

drivers/iio/light/cros_ec_light_prox.c

0 → 100644
+289 −0
Original line number Diff line number Diff line 
/*

 * cros_ec_light_prox - Driver for light and prox sensors behing 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/platform_device.h>

#include <linux/slab.h>

#include <linux/sysfs.h>



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



/*

 * We only represent one entry for light or proximity. EC is merging different

 * light sensors to return the what the eye would see. For proximity, we

 * currently support only one light source.

 */

#define CROS_EC_LIGHT_PROX_MAX_CHANNELS (1 + 1)



/* State data for ec_sensors iio driver. */

struct cros_ec_light_prox_state {

	/* Shared by all sensors */

	struct cros_ec_sensors_core_state core;



	struct iio_chan_spec channels[CROS_EC_LIGHT_PROX_MAX_CHANNELS];

};



static int cros_ec_light_prox_read(struct iio_dev *indio_dev,

				   struct iio_chan_spec const *chan,

				   int *val, int *val2, long mask)

{

	struct cros_ec_light_prox_state *st = iio_priv(indio_dev);

	u16 data = 0;

	s64 val64;

	int ret = IIO_VAL_INT;

	int idx = chan->scan_index;



	mutex_lock(&st->core.cmd_lock);



	switch (mask) {

	case IIO_CHAN_INFO_RAW:

		if (chan->type == IIO_PROXIMITY) {

			if (cros_ec_sensors_read_cmd(indio_dev, 1 << idx,

						     (s16 *)&data) < 0) {

				ret = -EIO;

				break;

			}

			*val = data;

		} else {

			ret = -EINVAL;

		}

		break;

	case IIO_CHAN_INFO_PROCESSED:

		if (chan->type == IIO_LIGHT) {

			if (cros_ec_sensors_read_cmd(indio_dev, 1 << idx,

						     (s16 *)&data) < 0) {

				ret = -EIO;

				break;

			}

			/*

			 * The data coming from the light sensor is

			 * pre-processed and represents the ambient light

			 * illuminance reading expressed in lux.

			 */

			*val = data;

			ret = IIO_VAL_INT;

		} else {

			ret = -EINVAL;

		}

		break;

	case IIO_CHAN_INFO_CALIBBIAS:

		st->core.param.cmd = MOTIONSENSE_CMD_SENSOR_OFFSET;

		st->core.param.sensor_offset.flags = 0;



		if (cros_ec_motion_send_host_cmd(&st->core, 0)) {

			ret = -EIO;

			break;

		}



		/* Save values */

		st->core.calib[0] = st->core.resp->sensor_offset.offset[0];



		*val = st->core.calib[idx];

		break;

	case IIO_CHAN_INFO_CALIBSCALE:

		/*

		 * RANGE is used for calibration

		 * scale is a number x.y, where x is coded on 16 bits,

		 * y coded on 16 bits, between 0 and 9999.

		 */

		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;

		}



		val64 = st->core.resp->sensor_range.ret;

		*val = val64 >> 16;

		*val2 = (val64 & 0xffff) * 100;

		ret = IIO_VAL_INT_PLUS_MICRO;

		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_light_prox_write(struct iio_dev *indio_dev,

			       struct iio_chan_spec const *chan,

			       int val, int val2, long mask)

{

	struct cros_ec_light_prox_state *st = iio_priv(indio_dev);

	int ret = 0;

	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;

		st->core.param.sensor_offset.offset[0] = st->core.calib[0];

		st->core.param.sensor_offset.temp =

					EC_MOTION_SENSE_INVALID_CALIB_TEMP;

		if (cros_ec_motion_send_host_cmd(&st->core, 0))

			ret = -EIO;

		break;

	case IIO_CHAN_INFO_CALIBSCALE:

		st->core.param.cmd = MOTIONSENSE_CMD_SENSOR_RANGE;

		st->core.param.sensor_range.data = (val << 16) | (val2 / 100);

		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_light_prox_info = {

	.read_raw = &cros_ec_light_prox_read,

	.write_raw = &cros_ec_light_prox_write,

	.driver_module = THIS_MODULE,

};



static int cros_ec_light_prox_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_light_prox_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_light_prox_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_shared_by_all =

		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_LIGHT:

		channel->type = IIO_LIGHT;

		channel->info_mask_separate =

			BIT(IIO_CHAN_INFO_PROCESSED) |

			BIT(IIO_CHAN_INFO_CALIBBIAS) |

			BIT(IIO_CHAN_INFO_CALIBSCALE);

		break;

	case MOTIONSENSE_TYPE_PROX:

		channel->type = IIO_PROXIMITY;

		channel->info_mask_separate =

			BIT(IIO_CHAN_INFO_RAW) |

			BIT(IIO_CHAN_INFO_CALIBBIAS) |

			BIT(IIO_CHAN_INFO_CALIBSCALE);

		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_LIGHT_PROX_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_light_prox_ids[] = {

	{

		.name = "cros-ec-prox",

	},

	{

		.name = "cros-ec-light",

	},

	{ /* sentinel */ }

};

MODULE_DEVICE_TABLE(platform, cros_ec_light_prox_ids);



static struct platform_driver cros_ec_light_prox_platform_driver = {

	.driver = {

		.name	= "cros-ec-light-prox",

	},

	.probe		= cros_ec_light_prox_probe,

	.id_table	= cros_ec_light_prox_ids,

};

module_platform_driver(cros_ec_light_prox_platform_driver);



MODULE_DESCRIPTION("ChromeOS EC light/proximity sensors driver");

MODULE_LICENSE("GPL v2");