mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-24 12:50:35 +07:00
f53199c0bc
Due to an API misread, error code can be different for -EIO when reading a sysfs entry. Return the error reported by the cros_ec stack. Check the proper error message (protocol error, not supported) is reported when there is an error returned by the EC stack. Signed-off-by: Gwendal Grignou <gwendal@chromium.org> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
209 lines
5.1 KiB
C
209 lines
5.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* cros_ec_baro - Driver for barometer sensor behind CrosEC.
|
|
*
|
|
* Copyright (C) 2017 Google, Inc
|
|
*/
|
|
|
|
#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;
|
|
int idx = chan->scan_index;
|
|
|
|
mutex_lock(&st->core.cmd_lock);
|
|
|
|
switch (mask) {
|
|
case IIO_CHAN_INFO_RAW:
|
|
ret = cros_ec_sensors_read_cmd(indio_dev, 1 << idx,
|
|
(s16 *)&data);
|
|
if (ret)
|
|
break;
|
|
|
|
*val = data;
|
|
ret = IIO_VAL_INT;
|
|
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;
|
|
|
|
ret = cros_ec_motion_send_host_cmd(&st->core, 0);
|
|
if (ret)
|
|
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';
|
|
|
|
/* 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");
|