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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: Artur Rojek <contact@artur-rojek.eu>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Artur Rojek 2019-03-23 18:28:06 +01:00 committed by Jonathan Cameron
parent 1c163f4c7b
commit 9f421096a1
2 changed files with 34 additions and 0 deletions
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20
drivers/iio/inkern.c
View File

@ -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)
{

14
include/linux/iio/consumer.h
View File

@ -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.