iio: hid-sensors: Add api to get poll value
Added interface to get poll value in milli-seconds. This value is
changed by changing sampling frequency. This API allows clients
to wait for at least some poll milli seconds before reading a new sample.
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
diff --git a/drivers/iio/common/hid-sensors/hid-sensor-attributes.c b/drivers/iio/common/hid-sensors/hid-sensor-attributes.c
index e61b1fa..3729646 100644
--- a/drivers/iio/common/hid-sensors/hid-sensor-attributes.c
+++ b/drivers/iio/common/hid-sensors/hid-sensor-attributes.c
@@ -147,6 +147,26 @@
return value;
}
+s32 hid_sensor_read_poll_value(struct hid_sensor_common *st)
+{
+ s32 value = 0;
+ int ret;
+
+ ret = sensor_hub_get_feature(st->hsdev,
+ st->poll.report_id,
+ st->poll.index, &value);
+
+ if (ret < 0 || value < 0) {
+ return -EINVAL;
+ } else {
+ if (st->poll.units == HID_USAGE_SENSOR_UNITS_SECOND)
+ value = value * 1000;
+ }
+
+ return value;
+}
+EXPORT_SYMBOL(hid_sensor_read_poll_value);
+
int hid_sensor_read_samp_freq_value(struct hid_sensor_common *st,
int *val1, int *val2)
{
diff --git a/include/linux/hid-sensor-hub.h b/include/linux/hid-sensor-hub.h
index 89626b2..88d8d63 100644
--- a/include/linux/hid-sensor-hub.h
+++ b/include/linux/hid-sensor-hub.h
@@ -227,4 +227,6 @@
struct hid_sensor_hub_attribute_info *attr_info,
int *val0, int *val1);
+s32 hid_sensor_read_poll_value(struct hid_sensor_common *st);
+
#endif
