Handle the barometer sensor presented by the ChromeOS EC Sensor hub. Signed-off-by: Gwendal Grignou <gwendal@chromium.org> Signed-off-by: Enric Balletbo Serra <enric.balletbo@collabora.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>tirimbino
Gwendal Grignou
8 years ago
committed by
Jonathan Cameron
parent
b2d226caec
commit
d732248fdb
@ -0,0 +1,220 @@ |
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/*
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* cros_ec_baro - Driver for barometer sensor behind CrosEC. |
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* |
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* Copyright (C) 2017 Google, Inc |
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* |
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* This software is licensed under the terms of the GNU General Public |
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* License version 2, as published by the Free Software Foundation, and |
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* may be copied, distributed, and modified under those terms. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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*/ |
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#include <linux/delay.h> |
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#include <linux/device.h> |
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#include <linux/iio/buffer.h> |
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#include <linux/iio/iio.h> |
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#include <linux/iio/kfifo_buf.h> |
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#include <linux/iio/trigger.h> |
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#include <linux/iio/triggered_buffer.h> |
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#include <linux/iio/trigger_consumer.h> |
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#include <linux/kernel.h> |
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#include <linux/mfd/cros_ec.h> |
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#include <linux/mfd/cros_ec_commands.h> |
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#include <linux/module.h> |
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#include <linux/slab.h> |
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#include <linux/platform_device.h> |
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#include "../common/cros_ec_sensors/cros_ec_sensors_core.h" |
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/*
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* One channel for pressure, the other for timestamp. |
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*/ |
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#define CROS_EC_BARO_MAX_CHANNELS (1 + 1) |
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/* State data for ec_sensors iio driver. */ |
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struct cros_ec_baro_state { |
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/* Shared by all sensors */ |
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struct cros_ec_sensors_core_state core; |
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struct iio_chan_spec channels[CROS_EC_BARO_MAX_CHANNELS]; |
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}; |
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static int cros_ec_baro_read(struct iio_dev *indio_dev, |
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struct iio_chan_spec const *chan, |
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int *val, int *val2, long mask) |
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{ |
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struct cros_ec_baro_state *st = iio_priv(indio_dev); |
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u16 data = 0; |
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int ret = IIO_VAL_INT; |
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int idx = chan->scan_index; |
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mutex_lock(&st->core.cmd_lock); |
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switch (mask) { |
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case IIO_CHAN_INFO_RAW: |
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if (cros_ec_sensors_read_cmd(indio_dev, 1 << idx, |
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(s16 *)&data) < 0) |
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ret = -EIO; |
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*val = data; |
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break; |
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case IIO_CHAN_INFO_SCALE: |
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st->core.param.cmd = MOTIONSENSE_CMD_SENSOR_RANGE; |
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st->core.param.sensor_range.data = EC_MOTION_SENSE_NO_VALUE; |
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if (cros_ec_motion_send_host_cmd(&st->core, 0)) { |
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ret = -EIO; |
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break; |
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} |
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*val = st->core.resp->sensor_range.ret; |
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/* scale * in_pressure_raw --> kPa */ |
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*val2 = 10 << CROS_EC_SENSOR_BITS; |
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ret = IIO_VAL_FRACTIONAL; |
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break; |
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default: |
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ret = cros_ec_sensors_core_read(&st->core, chan, val, val2, |
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mask); |
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break; |
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} |
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mutex_unlock(&st->core.cmd_lock); |
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return ret; |
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} |
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static int cros_ec_baro_write(struct iio_dev *indio_dev, |
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struct iio_chan_spec const *chan, |
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int val, int val2, long mask) |
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{ |
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struct cros_ec_baro_state *st = iio_priv(indio_dev); |
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int ret = 0; |
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mutex_lock(&st->core.cmd_lock); |
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switch (mask) { |
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case IIO_CHAN_INFO_SCALE: |
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st->core.param.cmd = MOTIONSENSE_CMD_SENSOR_RANGE; |
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st->core.param.sensor_range.data = val; |
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/* Always roundup, so caller gets at least what it asks for. */ |
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st->core.param.sensor_range.roundup = 1; |
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if (cros_ec_motion_send_host_cmd(&st->core, 0)) |
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ret = -EIO; |
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break; |
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default: |
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ret = cros_ec_sensors_core_write(&st->core, chan, val, val2, |
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mask); |
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break; |
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} |
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mutex_unlock(&st->core.cmd_lock); |
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return ret; |
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} |
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static const struct iio_info cros_ec_baro_info = { |
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.read_raw = &cros_ec_baro_read, |
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.write_raw = &cros_ec_baro_write, |
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.driver_module = THIS_MODULE, |
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}; |
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static int cros_ec_baro_probe(struct platform_device *pdev) |
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{ |
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struct device *dev = &pdev->dev; |
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struct cros_ec_dev *ec_dev = dev_get_drvdata(dev->parent); |
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struct cros_ec_device *ec_device; |
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struct iio_dev *indio_dev; |
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struct cros_ec_baro_state *state; |
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struct iio_chan_spec *channel; |
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int ret; |
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if (!ec_dev || !ec_dev->ec_dev) { |
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dev_warn(dev, "No CROS EC device found.\n"); |
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return -EINVAL; |
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} |
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ec_device = ec_dev->ec_dev; |
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indio_dev = devm_iio_device_alloc(dev, sizeof(*state)); |
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if (!indio_dev) |
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return -ENOMEM; |
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ret = cros_ec_sensors_core_init(pdev, indio_dev, true); |
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if (ret) |
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return ret; |
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indio_dev->info = &cros_ec_baro_info; |
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state = iio_priv(indio_dev); |
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state->core.type = state->core.resp->info.type; |
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state->core.loc = state->core.resp->info.location; |
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channel = state->channels; |
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/* Common part */ |
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channel->info_mask_separate = BIT(IIO_CHAN_INFO_RAW); |
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channel->info_mask_shared_by_all = |
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BIT(IIO_CHAN_INFO_SCALE) | |
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BIT(IIO_CHAN_INFO_SAMP_FREQ) | |
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BIT(IIO_CHAN_INFO_FREQUENCY); |
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channel->scan_type.realbits = CROS_EC_SENSOR_BITS; |
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channel->scan_type.storagebits = CROS_EC_SENSOR_BITS; |
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channel->scan_type.shift = 0; |
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channel->scan_index = 0; |
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channel->ext_info = cros_ec_sensors_ext_info; |
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channel->scan_type.sign = 'u'; |
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state->core.calib[0] = 0; |
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/* Sensor specific */ |
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switch (state->core.type) { |
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case MOTIONSENSE_TYPE_BARO: |
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channel->type = IIO_PRESSURE; |
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break; |
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default: |
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dev_warn(dev, "Unknown motion sensor\n"); |
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return -EINVAL; |
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} |
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/* Timestamp */ |
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channel++; |
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channel->type = IIO_TIMESTAMP; |
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channel->channel = -1; |
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channel->scan_index = 1; |
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channel->scan_type.sign = 's'; |
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channel->scan_type.realbits = 64; |
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channel->scan_type.storagebits = 64; |
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indio_dev->channels = state->channels; |
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indio_dev->num_channels = CROS_EC_BARO_MAX_CHANNELS; |
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state->core.read_ec_sensors_data = cros_ec_sensors_read_cmd; |
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ret = devm_iio_triggered_buffer_setup(dev, indio_dev, NULL, |
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cros_ec_sensors_capture, NULL); |
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if (ret) |
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return ret; |
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return devm_iio_device_register(dev, indio_dev); |
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} |
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static const struct platform_device_id cros_ec_baro_ids[] = { |
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{ |
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.name = "cros-ec-baro", |
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}, |
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{ /* sentinel */ } |
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}; |
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MODULE_DEVICE_TABLE(platform, cros_ec_baro_ids); |
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static struct platform_driver cros_ec_baro_platform_driver = { |
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.driver = { |
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.name = "cros-ec-baro", |
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}, |
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.probe = cros_ec_baro_probe, |
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.id_table = cros_ec_baro_ids, |
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}; |
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module_platform_driver(cros_ec_baro_platform_driver); |
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MODULE_DESCRIPTION("ChromeOS EC barometer sensor driver"); |
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MODULE_LICENSE("GPL v2"); |
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