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authorFabien Lahoudere <fabien.lahoudere@collabora.com>2019-07-16 11:11:06 +0200
committerJonathan Cameron <Jonathan.Cameron@huawei.com>2019-07-27 23:15:08 +0100
commitae7b02ad2f32d39d1434655f346c04a16c1aa703 (patch)
tree9230bbf83261b35be0da7a9e185316742f172d86 /include/linux/iio
parent9566cb1ddb81c4f232d08cb2c7aff5b947959381 (diff)
iio: common: cros_ec_sensors: Expose cros_ec_sensors frequency range via iio sysfs
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> [rebased on top of iio/testing and solved conflicts] Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Diffstat (limited to 'include/linux/iio')
-rw-r--r--include/linux/iio/common/cros_ec_sensors_core.h21
1 files changed, 21 insertions, 0 deletions
diff --git a/include/linux/iio/common/cros_ec_sensors_core.h b/include/linux/iio/common/cros_ec_sensors_core.h
index 6f13c73bac3d..ea1f50ce2e49 100644
--- a/include/linux/iio/common/cros_ec_sensors_core.h
+++ b/include/linux/iio/common/cros_ec_sensors_core.h
@@ -73,6 +73,9 @@ 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];
};
/**
@@ -154,6 +157,24 @@ int cros_ec_sensors_core_read(struct cros_ec_sensors_core_state *st,
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
* @chan: channel specification structure table