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iio: common: cros_ec_sensors: Expose cros_ec_sensors frequency range via iio sysfs

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Embedded controller return minimum and maximum frequencies, unfortunately
we have no way to know the step for all available frequencies.
Even if not complete, we can return a list of known values using the
standard read_avail callback (IIO_CHAN_INFO_SAMP_FREQ) to provide them to
userland.

Now cros_ec_* sensors provides frequencies values in sysfs like this:
"0 min max". 0 is always true to disable the sensor.

Default frequencies are provided for earlier protocol.

Signed-off-by: Nick Vaccaro <nvaccaro@chromium.org>
Signed-off-by: Fabien Lahoudere <fabien.lahoudere@collabora.com>
[rebased on top of iio/testing and solved conflicts]
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Fabien Lahoudere 2019-07-16 11:11:06 +02:00 committed by Jonathan Cameron
parent 9566cb1ddb
commit ae7b02ad2f
4 changed files with 92 additions and 0 deletions
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3
drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c
View File

@ -215,6 +215,7 @@ static int cros_ec_sensors_write(struct iio_dev *indio_dev,
static const struct iio_info ec_sensors_info = {
.read_raw = &cros_ec_sensors_read,
.write_raw = &cros_ec_sensors_write,
.read_avail = &cros_ec_sensors_core_read_avail,
};
static int cros_ec_sensors_probe(struct platform_device *pdev)
@ -252,6 +253,8 @@ static int cros_ec_sensors_probe(struct platform_device *pdev)
BIT(IIO_CHAN_INFO_SCALE) |
BIT(IIO_CHAN_INFO_FREQUENCY) |
BIT(IIO_CHAN_INFO_SAMP_FREQ);
channel->info_mask_shared_by_all_available =
BIT(IIO_CHAN_INFO_SAMP_FREQ);
channel->scan_type.realbits = CROS_EC_SENSOR_BITS;
channel->scan_type.storagebits = CROS_EC_SENSOR_BITS;
channel->scan_index = i;

65
drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
View File

@ -50,6 +50,37 @@ static int cros_ec_get_host_cmd_version_mask(struct cros_ec_device *ec_dev,
return ret;
}
static void get_default_min_max_freq(enum motionsensor_type type,
u32 *min_freq,
u32 *max_freq)
{
switch (type) {
case MOTIONSENSE_TYPE_ACCEL:
case MOTIONSENSE_TYPE_GYRO:
*min_freq = 12500;
*max_freq = 100000;
break;
case MOTIONSENSE_TYPE_MAG:
*min_freq = 5000;
*max_freq = 25000;
break;
case MOTIONSENSE_TYPE_PROX:
case MOTIONSENSE_TYPE_LIGHT:
*min_freq = 100;
*max_freq = 50000;
break;
case MOTIONSENSE_TYPE_BARO:
*min_freq = 250;
*max_freq = 20000;
break;
case MOTIONSENSE_TYPE_ACTIVITY:
default:
*min_freq = 0;
*max_freq = 0;
break;
}
}
int cros_ec_sensors_core_init(struct platform_device *pdev,
struct iio_dev *indio_dev,
bool physical_device)
@ -104,6 +135,19 @@ int cros_ec_sensors_core_init(struct platform_device *pdev,
/* Set sign vector, only used for backward compatibility. */
memset(state->sign, 1, CROS_EC_SENSOR_MAX_AXIS);
/* 0 is a correct value used to stop the device */
state->frequencies[0] = 0;
if (state->msg->version < 3) {
get_default_min_max_freq(state->resp->info.type,
&state->frequencies[1],
&state->frequencies[2]);
} else {
state->frequencies[1] =
state->resp->info_3.min_frequency;
state->frequencies[2] =
state->resp->info_3.max_frequency;
}
}
return 0;
@ -471,6 +515,27 @@ int cros_ec_sensors_core_read(struct cros_ec_sensors_core_state *st,
}
EXPORT_SYMBOL_GPL(cros_ec_sensors_core_read);
int cros_ec_sensors_core_read_avail(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
const int **vals,
int *type,
int *length,
long mask)
{
struct cros_ec_sensors_core_state *state = iio_priv(indio_dev);
switch (mask) {
case IIO_CHAN_INFO_SAMP_FREQ:
*length = ARRAY_SIZE(state->frequencies);
*vals = (const int *)&state->frequencies;
*type = IIO_VAL_INT;
return IIO_AVAIL_LIST;
}
return -EINVAL;
}
EXPORT_SYMBOL_GPL(cros_ec_sensors_core_read_avail);
int cros_ec_sensors_core_write(struct cros_ec_sensors_core_state *st,
struct iio_chan_spec const *chan,
int val, int val2, long mask)

3
drivers/iio/light/cros_ec_light_prox.c
View File

@ -162,6 +162,7 @@ static int cros_ec_light_prox_write(struct iio_dev *indio_dev,
static const struct iio_info cros_ec_light_prox_info = {
.read_raw = &cros_ec_light_prox_read,
.write_raw = &cros_ec_light_prox_write,
.read_avail = &cros_ec_sensors_core_read_avail,
};
static int cros_ec_light_prox_probe(struct platform_device *pdev)
@ -196,6 +197,8 @@ static int cros_ec_light_prox_probe(struct platform_device *pdev)
channel->info_mask_shared_by_all =
BIT(IIO_CHAN_INFO_SAMP_FREQ) |
BIT(IIO_CHAN_INFO_FREQUENCY);
channel->info_mask_shared_by_all_available =
BIT(IIO_CHAN_INFO_SAMP_FREQ);
channel->scan_type.realbits = CROS_EC_SENSOR_BITS;
channel->scan_type.storagebits = CROS_EC_SENSOR_BITS;
channel->scan_type.shift = 0;

21
include/linux/iio/common/cros_ec_sensors_core.h
View File

@ -73,6 +73,9 @@ struct cros_ec_sensors_core_state {
unsigned long scan_mask, s16 *data);
int curr_sampl_freq;
/* Table of known available frequencies : 0, Min and Max in mHz */
int frequencies[3];
};
/**
@ -153,6 +156,24 @@ int cros_ec_sensors_core_read(struct cros_ec_sensors_core_state *st,
struct iio_chan_spec const *chan,
int *val, int *val2, long mask);
/**
* cros_ec_sensors_core_read_avail() - get available values
* @indio_dev: pointer to state information for device
* @chan: channel specification structure table
* @vals: list of available values
* @type: type of data returned
* @length: number of data returned in the array
* @mask: specifies which values to be requested
*
* Return: an error code, IIO_AVAIL_RANGE or IIO_AVAIL_LIST
*/
int cros_ec_sensors_core_read_avail(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
const int **vals,
int *type,
int *length,
long mask);
/**
* cros_ec_sensors_core_write() - function to write a value to the sensor
* @st: pointer to state information for device