iio: core: Add devm_ APIs for iio_channel_{get,release}_all

Some of kernel driver uses the IIO framework to get the sensor
value via ADC or IIO HW driver. The client driver get iio channel
by iio_channel_get_all() and release it by calling
iio_channel_release_all().

Add resource managed version (devm_*) of these APIs so that if client
calls the devm_iio_channel_get_all() then it need not to release it
explicitly, it can be done by managed device framework when driver
get un-binded.

This reduces the code in error path and also need of .remove callback in
some cases.

Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

1 files changed, 26 insertions, 0 deletions

diff --git a/include/linux/iio/consumer.h b/include/linux/iio/consumer.h
index e1e033d6a81f..3d672f72e7ec 100644
--- a/include/linux/iio/consumer.h
+++ b/include/linux/iio/consumer.h
@@ -92,6 +92,32 @@ struct iio_channel *iio_channel_get_all(struct device *dev);
  */
 void iio_channel_release_all(struct iio_channel *chan);
 
+/**
+ * devm_iio_channel_get_all() - Resource managed version of
+ *				iio_channel_get_all().
+ * @dev: Pointer to consumer device.
+ *
+ * Returns a pointer to negative errno if it is not able to get the iio channel
+ * otherwise returns an array of iio_channel structures terminated with one with
+ * null iio_dev pointer.
+ *
+ * This function is used by fairly generic consumers to get all the
+ * channels registered as having this consumer.
+ *
+ * The allocated iio channels are automatically released when the device is
+ * unbounded.
+ */
+struct iio_channel *devm_iio_channel_get_all(struct device *dev);
+
+/**
+ * devm_iio_channel_release_all() - Resource managed version of
+ *				    iio_channel_release_all().
+ * @dev:		Pointer to consumer device for which resource
+ *			is allocared.
+ * @chan:		Array channel to be released.
+ */
+void devm_iio_channel_release_all(struct device *dev, struct iio_channel *chan);
+
 struct iio_cb_buffer;
 /**
  * iio_channel_get_all_cb() - register callback for triggered capture