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authorLaxman Dewangan <ldewangan@nvidia.com>2016-04-06 16:01:07 +0530
committerJonathan Cameron <jic23@kernel.org>2016-04-19 19:58:15 +0100
commitefc2c0133f198bc65593a67015af358919b0c48f (patch)
treea5559eed375f002c6ed912abd05c79e73f4bb7c4 /include/linux/iio
parent8bf872d8d261feefcdf67027522e3f717cad2bfe (diff)
downloadop-kernel-dev-efc2c0133f198bc65593a67015af358919b0c48f.zip
op-kernel-dev-efc2c0133f198bc65593a67015af358919b0c48f.tar.gz
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>
Diffstat (limited to 'include/linux/iio')
-rw-r--r--include/linux/iio/consumer.h26
1 files changed, 26 insertions, 0 deletions
diff --git a/include/linux/iio/consumer.h b/include/linux/iio/consumer.h
index e1e033d..3d672f7 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
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