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@xxxxxxxxxxxx>
---
drivers/iio/accel/cros_ec_accel_legacy.c | 52 +++++++++++++++++++++++-
1 file changed, 51 insertions(+), 1 deletion(-)
diff --git a/drivers/iio/accel/cros_ec_accel_legacy.c b/drivers/iio/accel/cros_ec_accel_legacy.c
index 2532b9ad33842..e924183089368 100644
--- a/drivers/iio/accel/cros_ec_accel_legacy.c
+++ b/drivers/iio/accel/cros_ec_accel_legacy.c
@@ -33,6 +33,11 @@
*/
#define ACCEL_LEGACY_NSCALE 9586168
+/*
+ * Sensor frequency is hard-coded to 10Hz.
+ */
+#define ACCEL_LEGACY_FREQ 10
+
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 = ACCEL_LEGACY_FREQ;
+ *val2 = 0;
+ ret = IIO_VAL_INT_PLUS_MICRO;
+ break;
default:
ret = cros_ec_sensors_core_read(st, chan, val, val2,
mask);
@@ -120,9 +130,41 @@ 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, IIO_AVAIL_RANGE 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)
+{
+ struct cros_ec_sensors_core_state *state = iio_priv(indio_dev);
+
+ switch (mask) {
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ *length = 2;
+ *vals = (const int *)&state->frequencies;
+ *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 +184,11 @@ 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', \
@@ -191,6 +237,10 @@ static int cros_ec_accel_legacy_probe(struct platform_device *pdev)
state->sign[CROS_EC_SENSOR_Z] = -1;
}
+ /* Frequency can not be changed on glimmer and is set to 10Hz. */
+ state->frequencies[0] = ACCEL_LEGACY_FREQ;
+ state->frequencies[1] = 0;
+
return devm_iio_device_register(dev, indio_dev);
}
--
2.27.0.212.ge8ba1cc988-goog
