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iio: cros_ec_accel_legacy: Add Read Only frequency entries

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Report to user space that 10Hz is the sampling frequency of
the accelerometers in legacy mode, and it can not be changed.

Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
Reviewed-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Gwendal Grignou 2020-07-09 11:09:24 -07:00 committed by Jonathan Cameron
parent 853fa48717
commit 9ef38afd25
1 changed files with 45 additions and 1 deletions
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46
drivers/iio/accel/cros_ec_accel_legacy.c
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@ -33,6 +33,11 @@
*/
#define ACCEL_LEGACY_NSCALE 9586168
/*
* Sensor frequency is hard-coded to 10Hz.
*/
static const int cros_ec_legacy_sample_freq[] = { 10, 0 };
static int cros_ec_accel_legacy_read_cmd(struct iio_dev *indio_dev,
unsigned long scan_mask, s16 *data)
{
@ -96,6 +101,11 @@ static int cros_ec_accel_legacy_read(struct iio_dev *indio_dev,
*val = 0;
ret = IIO_VAL_INT;
break;
case IIO_CHAN_INFO_SAMP_FREQ:
*val = cros_ec_legacy_sample_freq[0];
*val2 = cros_ec_legacy_sample_freq[1];
ret = IIO_VAL_INT_PLUS_MICRO;
break;
default:
ret = cros_ec_sensors_core_read(st, chan, val, val2,
mask);
@ -120,9 +130,39 @@ static int cros_ec_accel_legacy_write(struct iio_dev *indio_dev,
return -EINVAL;
}
/**
* cros_ec_accel_legacy_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 or IIO_AVAIL_LIST
*/
static int cros_ec_accel_legacy_read_avail(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
const int **vals,
int *type,
int *length,
long mask)
{
switch (mask) {
case IIO_CHAN_INFO_SAMP_FREQ:
*length = ARRAY_SIZE(cros_ec_legacy_sample_freq);
*vals = cros_ec_legacy_sample_freq;
*type = IIO_VAL_INT_PLUS_MICRO;
return IIO_AVAIL_LIST;
}
return -EINVAL;
}
static const struct iio_info cros_ec_accel_legacy_info = {
.read_raw = &cros_ec_accel_legacy_read,
.write_raw = &cros_ec_accel_legacy_write,
.read_avail = &cros_ec_accel_legacy_read_avail,
};
/*
@ -142,7 +182,11 @@ static const struct iio_info cros_ec_accel_legacy_info = {
.info_mask_separate = \
BIT(IIO_CHAN_INFO_RAW) | \
BIT(IIO_CHAN_INFO_CALIBBIAS), \
.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SCALE), \
.info_mask_shared_by_all = \
BIT(IIO_CHAN_INFO_SCALE) | \
BIT(IIO_CHAN_INFO_SAMP_FREQ), \
.info_mask_shared_by_all_available = \
BIT(IIO_CHAN_INFO_SAMP_FREQ), \
.ext_info = cros_ec_sensors_ext_info, \
.scan_type = { \
.sign = 's', \