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. Signed-off-by: Fabien Lahoudere <[email protected]> --- .../cros_ec_sensors/cros_ec_sensors_core.c | 22 +++++++++++++++++++ .../linux/iio/common/cros_ec_sensors_core.h | 4 +++- 2 files changed, 25 insertions(+), 1 deletion(-) diff --git a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c index 2ce077b576a4..8df82b675752 100644 --- a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c +++ b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c @@ -10,6 +10,7 @@ #include <linux/iio/buffer.h> #include <linux/iio/common/cros_ec_sensors_core.h> #include <linux/iio/iio.h> +#include <linux/iio/sysfs.h> #include <linux/iio/kfifo_buf.h> #include <linux/iio/trigger_consumer.h> #include <linux/iio/triggered_buffer.h> @@ -86,6 +87,26 @@ static int cros_ec_get_host_cmd_version_mask(struct cros_ec_device *ec_dev, return ret; } +static int cros_ec_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 = 3; + *vals = (const int *)&state->frequency_range; + *type = IIO_VAL_INT; + return IIO_AVAIL_LIST; + } + + return -EINVAL; +} + int cros_ec_sensors_core_init(struct platform_device *pdev, int num_channels, bool physical_device) @@ -161,6 +182,7 @@ int cros_ec_sensors_core_init(struct platform_device *pdev, } } + state->info.read_avail = cros_ec_read_avail; indio_dev->info = &state->info; /* Timestamp channel */ diff --git a/include/linux/iio/common/cros_ec_sensors_core.h b/include/linux/iio/common/cros_ec_sensors_core.h index 89937ad242ef..5fa9ba5332e0 100644 --- a/include/linux/iio/common/cros_ec_sensors_core.h +++ b/include/linux/iio/common/cros_ec_sensors_core.h @@ -140,7 +140,9 @@ int cros_ec_sensors_core_register(struct platform_device *pdev, channel[idx].scan_type.shift = 0;\ channel[idx].scan_index = idx;\ channel[idx].ext_info = cros_ec_sensors_ext_info;\ - channel[idx].scan_type.sign = 'u'; + channel[idx].scan_type.sign = 'u';\ + channel[idx].info_mask_shared_by_all_available = \ + BIT(IIO_CHAN_INFO_SAMP_FREQ); /** * cros_ec_motion_send_host_cmd() - send motion sense host command -- 2.20.1
