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Commit d5c5b3f3 authored by Nicholas Troast's avatar Nicholas Troast Committed by David Collins
Browse files

iio: support writing processed values to IIO channels 



Add a new function to the IIO API which allows consumers to write
processed values to IIO channels.

This is particularly useful for supporting hardware which has
configurable ADC thresholds. A consumer would be able to change an ADC
threshold by providing a processed value instead of calculating a raw
value.

Change-Id: I7d3b22beddb6fd1fda0cc0aefbcb4cf5cb58bf82
Signed-off-by: default avatarNicholas Troast <ntroast@codeaurora.org>
parent 60f54592

drivers/iio/inkern.c

+18 −0
Original line number Diff line number Diff line
@@ -746,3 +746,21 @@ int iio_write_channel_raw(struct iio_channel *chan, int val) 
	return ret;

}

EXPORT_SYMBOL_GPL(iio_write_channel_raw);



int iio_write_channel_processed(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_write(chan, val, 0, IIO_CHAN_INFO_PROCESSED);

err_unlock:

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



	return ret;

}

EXPORT_SYMBOL_GPL(iio_write_channel_processed);

include/linux/iio/consumer.h

+10 −0
Original line number Diff line number Diff line
@@ -225,6 +225,16 @@ int iio_read_channel_processed(struct iio_channel *chan, int *val); 
 */

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



/**

 * iio_write_channel_processed() - write to a given channel

 * @chan:		The channel being queried.

 * @val:		Value being written.

 *

 * Note processed writes to iio channels are converted to raw

 * values before being written.

 */

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



/**

 * iio_get_channel_type() - get the type of a channel

 * @channel:		The channel being queried.