| Message ID | 27edd1c47f6d741ee2bfa9ad86c45345e1878ff5.1562672771.git.fabien.lahoudere@collabora.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Expose cros_ec_sensors frequency range via iio sysfs | expand |
On Tue, 9 Jul 2019 13:53:45 +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> There is some trailing whitespace in here, and with the high level of other work going on in this driver a lot of fuzz. So with the whitespace fixed, Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> > --- > .../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..2f1b6d8d617b 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..c62cb022b6bc 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
Le dimanche 14 juillet 2019 à 18:31 +0100, Jonathan Cameron a écrit : > On Tue, 9 Jul 2019 13:53:45 +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> > There is some trailing whitespace in here, and with the high level > of other work going on in this driver a lot of fuzz. > Sorry for that, I will fix it quickly. Thanks for reviewing > So with the whitespace fixed, > Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> > > --- > > .../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..2f1b6d8d617b 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..c62cb022b6bc 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
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..2f1b6d8d617b 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..c62cb022b6bc 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