Commit 0023e67d authored by Matt Ranostay's avatar Matt Ranostay Committed by Jonathan Cameron
Browse files

iio: inkern: add iio_read_channel_offset helper 



Allow access to underlying channel IIO_CHAN_INFO_OFFSET from a consumer.

Signed-off-by: default avatarMatt Ranostay <matt@ranostay.consulting>
Signed-off-by: default avatarJonathan Cameron <jic23@kernel.org>
parent 2a20af72

drivers/iio/inkern.c

+26 −13
Original line number Diff line number Diff line
@@ -658,6 +658,31 @@ int iio_convert_raw_to_processed(struct iio_channel *chan, int raw, 
}

EXPORT_SYMBOL_GPL(iio_convert_raw_to_processed);



static int iio_read_channel_attribute(struct iio_channel *chan,

				      int *val, int *val2,

				      enum iio_chan_info_enum attribute)

{

	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, val2, attribute);

err_unlock:

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



	return ret;

}



int iio_read_channel_offset(struct iio_channel *chan, int *val, int *val2)

{

	return iio_read_channel_attribute(chan, val, val2, IIO_CHAN_INFO_OFFSET);

}

EXPORT_SYMBOL_GPL(iio_read_channel_offset);



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

{

	int ret;
@@ -687,19 +712,7 @@ EXPORT_SYMBOL_GPL(iio_read_channel_processed); 


int iio_read_channel_scale(struct iio_channel *chan, int *val, int *val2)

{

	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, val2, IIO_CHAN_INFO_SCALE);

err_unlock:

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



	return ret;

	return iio_read_channel_attribute(chan, val, val2, IIO_CHAN_INFO_SCALE);

}

EXPORT_SYMBOL_GPL(iio_read_channel_scale);

include/linux/iio/consumer.h

+13 −0
Original line number Diff line number Diff line
@@ -235,6 +235,19 @@ int iio_write_channel_raw(struct iio_channel *chan, int val); 
int iio_get_channel_type(struct iio_channel *channel,

			 enum iio_chan_type *type);



/**

 * iio_read_channel_offset() - read the offset value for a channel

 * @chan:		The channel being queried.

 * @val:		First part of value read back.

 * @val2:		Second part of value read back.

 *

 * Note returns a description of what is in val and val2, such

 * as IIO_VAL_INT_PLUS_MICRO telling us we have a value of val

 * + val2/1e6

 */

int iio_read_channel_offset(struct iio_channel *chan, int *val,

			   int *val2);



/**

 * iio_read_channel_scale() - read the scale value for a channel

 * @chan:		The channel being queried.