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Commit 90309245 authored by Srinivas Pandruvada's avatar Srinivas Pandruvada Committed by Jonathan Cameron
Browse files

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: default avatarSrinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: default avatarJonathan Cameron <jic23@kernel.org>
parent 5d02edfc

drivers/iio/common/hid-sensors/hid-sensor-attributes.c

+20 −0
Original line number Diff line number Diff line
@@ -147,6 +147,26 @@ static u32 convert_to_vtf_format(int size, int exp, int val1, int val2) 
	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)

{

include/linux/hid-sensor-hub.h

+2 −0
Original line number Diff line number Diff line
@@ -227,4 +227,6 @@ int hid_sensor_format_scale(u32 usage_id, 
			    struct hid_sensor_hub_attribute_info *attr_info,

			    int *val0, int *val1);



s32 hid_sensor_read_poll_value(struct hid_sensor_common *st);



#endif