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>

diff --git a/drivers/iio/inkern.c b/drivers/iio/inkern.c
index 9fd8934..c4757e6 100644 (file)
--- a/drivers/iio/inkern.c
+++ b/drivers/iio/inkern.c
@@ -489,6 +489,42 @@ void iio_channel_release_all(struct iio_channel *channels)
 }
 EXPORT_SYMBOL_GPL(iio_channel_release_all);
 
+static void devm_iio_channel_free_all(struct device *dev, void *res)
+{
+       struct iio_channel *channels = *(struct iio_channel **)res;
+
+       iio_channel_release_all(channels);
+}
+
+struct iio_channel *devm_iio_channel_get_all(struct device *dev)
+{
+       struct iio_channel **ptr, *channels;
+
+       ptr = devres_alloc(devm_iio_channel_free_all, sizeof(*ptr), GFP_KERNEL);
+       if (!ptr)
+               return ERR_PTR(-ENOMEM);
+
+       channels = iio_channel_get_all(dev);
+       if (IS_ERR(channels)) {
+               devres_free(ptr);
+               return channels;
+       }
+
+       *ptr = channels;
+       devres_add(dev, ptr);
+
+       return channels;
+}
+EXPORT_SYMBOL_GPL(devm_iio_channel_get_all);
+
+void devm_iio_channel_release_all(struct device *dev,
+                                 struct iio_channel *channels)
+{
+       WARN_ON(devres_release(dev, devm_iio_channel_free_all,
+                              devm_iio_channel_match, channels));
+}
+EXPORT_SYMBOL_GPL(devm_iio_channel_release_all);
+
 static int iio_channel_read(struct iio_channel *chan, int *val, int *val2,
        enum iio_chan_info_enum info)
 {

diff --git a/include/linux/iio/consumer.h b/include/linux/iio/consumer.h
index e1e033d..3d672f7 100644 (file)
--- 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