[PATCH v2 1/4] iio: inkern: API for reading available iio channel attribute values

Artur Rojek
2019-03-23T17:28:20Z

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

Signed-off-by: Artur Rojek <contact@artur-rojek.eu>
---

Changes:

v2: no change

drivers/iio/inkern.c | 20 ++++++++++++++++++++
include/linux/iio/consumer.h | 14 ++++++++++++++
2 files changed, 34 insertions(+)

diff --git a/drivers/iio/inkern.c b/drivers/iio/inkern.c
index 06ca3f7fcc44..f19dbde3c945 100644
--- a/drivers/iio/inkern.c
+++ b/drivers/iio/inkern.c
@@ -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)
{
diff --git a/include/linux/iio/consumer.h b/include/linux/iio/consumer.h
index 9887f4f8e2a8..b2d34831ed7c 100644
--- a/include/linux/iio/consumer.h
+++ b/include/linux/iio/consumer.h
@@ -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.
--
2.21.0