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SubjectRe: [PATCH v5 1/1] iio: common: cros_ec_sensors: Expose cros_ec_sensors frequency range via iio sysfs
On Tue, 16 Jul 2019 11:11:06 +0200
Fabien Lahoudere <fabien.lahoudere@collabora.com> wrote:

> 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>
> Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

I applied a version Enric had rebased. Hopefully it matches this!
Was easier than repeating his conflict resolution.

thanks,

Jonathan

> ---
> .../common/cros_ec_sensors/cros_ec_sensors.c | 3 +
> .../cros_ec_sensors/cros_ec_sensors_core.c | 65 +++++++++++++++++++
> drivers/iio/light/cros_ec_light_prox.c | 3 +
> .../linux/iio/common/cros_ec_sensors_core.h | 21 ++++++
> 4 files changed, 92 insertions(+)
>
> diff --git a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c
> index 17af4e0fd5f8..dbca02688c4f 100644
> --- a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c
> +++ b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c
> @@ -175,6 +175,7 @@ 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)
> @@ -211,6 +212,8 @@ 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;
> 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 81111af8a167..805652250960 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
> @@ -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)
> @@ -100,6 +131,19 @@ int cros_ec_sensors_core_init(struct platform_device *pdev,
> }
> state->type = state->resp->info.type;
> state->loc = state->resp->info.location;
> +
> + /* 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;
> @@ -461,6 +505,27 @@ 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)
> diff --git a/drivers/iio/light/cros_ec_light_prox.c b/drivers/iio/light/cros_ec_light_prox.c
> index 308ee6ff2e22..b9838bf25248 100644
> --- a/drivers/iio/light/cros_ec_light_prox.c
> +++ b/drivers/iio/light/cros_ec_light_prox.c
> @@ -164,6 +164,7 @@ 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)
> @@ -198,6 +199,8 @@ 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;
> diff --git a/include/linux/iio/common/cros_ec_sensors_core.h b/include/linux/iio/common/cros_ec_sensors_core.h
> index 0c636b9fe8d7..a9623111f7c9 100644
> --- a/include/linux/iio/common/cros_ec_sensors_core.h
> +++ b/include/linux/iio/common/cros_ec_sensors_core.h
> @@ -70,6 +70,9 @@ 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];
> };
>
> /**
> @@ -150,6 +153,24 @@ 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

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