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/*
* 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/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/mfd/cros_ec.h>
#include <linux/mfd/cros_ec_commands.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/platform_device.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,
};
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 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;
}
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");
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