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Commit 9f421096 authored by Artur Rojek's avatar Artur Rojek Committed by Jonathan Cameron
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iio: inkern: API for reading available iio channel attribute values 



Extend the inkern API with a function for reading available
attribute values of iio channels.

Signed-off-by: default avatarArtur Rojek <contact@artur-rojek.eu>
Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent 1c163f4c

drivers/iio/inkern.c

+20 −0
Original line number Diff line number Diff line
@@ -733,6 +733,26 @@ static int iio_channel_read_avail(struct iio_channel *chan, 
						 vals, type, length, info);

}



int iio_read_avail_channel_attribute(struct iio_channel *chan,

				     const int **vals, int *type, int *length,

				     enum iio_chan_info_enum attribute)

{

	int ret;



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

	if (!chan->indio_dev->info) {

		ret = -ENODEV;

		goto err_unlock;

	}



	ret = iio_channel_read_avail(chan, vals, type, length, attribute);

err_unlock:

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



	return ret;

}

EXPORT_SYMBOL_GPL(iio_read_avail_channel_attribute);



int iio_read_avail_channel_raw(struct iio_channel *chan,

			       const int **vals, int *length)

{

include/linux/iio/consumer.h

+14 −0
Original line number Diff line number Diff line
@@ -290,6 +290,20 @@ int iio_read_max_channel_raw(struct iio_channel *chan, int *val); 
int iio_read_avail_channel_raw(struct iio_channel *chan,

			       const int **vals, int *length);



/**

 * iio_read_avail_channel_attribute() - read available channel attribute values

 * @chan:		The channel being queried.

 * @vals:		Available values read back.

 * @type:		Type of values read back.

 * @length:		Number of entries in vals.

 * @attribute:		info attribute to be read back.

 *

 * Returns an error code, IIO_AVAIL_RANGE or IIO_AVAIL_LIST.

 */

int iio_read_avail_channel_attribute(struct iio_channel *chan,

				     const int **vals, int *type, int *length,

				     enum iio_chan_info_enum attribute);



/**

 * iio_get_channel_type() - get the type of a channel

 * @channel:		The channel being queried.