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Commit 476d4af2 authored by Sebastian Reichel's avatar Sebastian Reichel Committed by Jonathan Cameron
Browse files

iio: inkern: add iio_read_channel_average_raw 



Add iio_read_channel_average_raw to support reading
averaged raw values in consumer drivers.

Signed-off-by: default avatarSebastian Reichel <sre@debian.org>
Signed-off-by: default avatarJonathan Cameron <jic23@kernel.org>
parent c0a6b7ee

drivers/iio/inkern.c

+18 −0
Original line number Diff line number Diff line
@@ -443,6 +443,24 @@ int iio_read_channel_raw(struct iio_channel *chan, int *val) 
}

EXPORT_SYMBOL_GPL(iio_read_channel_raw);



int iio_read_channel_average_raw(struct iio_channel *chan, int *val)

{

	int ret;



	mutex_lock(&chan->indio_dev->info_exist_lock);

	if (chan->indio_dev->info == NULL) {

		ret = -ENODEV;

		goto err_unlock;

	}



	ret = iio_channel_read(chan, val, NULL, IIO_CHAN_INFO_AVERAGE_RAW);

err_unlock:

	mutex_unlock(&chan->indio_dev->info_exist_lock);



	return ret;

}

EXPORT_SYMBOL_GPL(iio_read_channel_average_raw);



static int iio_convert_raw_to_processed_unlocked(struct iio_channel *chan,

	int raw, int *processed, unsigned int scale)

{

include/linux/iio/consumer.h

+13 −0
Original line number Diff line number Diff line
@@ -122,6 +122,19 @@ struct iio_channel 
int iio_read_channel_raw(struct iio_channel *chan,

			 int *val);



/**

 * iio_read_channel_average_raw() - read from a given channel

 * @chan:		The channel being queried.

 * @val:		Value read back.

 *

 * Note raw reads from iio channels are in adc counts and hence

 * scale will need to be applied if standard units required.

 *

 * In opposit to the normal iio_read_channel_raw this function

 * returns the average of multiple reads.

 */

int iio_read_channel_average_raw(struct iio_channel *chan, int *val);



/**

 * iio_read_channel_processed() - read processed value from a given channel

 * @chan:		The channel being queried.