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authorLars-Peter Clausen <lars@metafoo.de>2012-05-12 17:39:32 +0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-05-15 00:34:31 +0400
commit7a7913f11ddf932e20d2bde72bec57f2f7a9b49e (patch)
tree8494f244143cae26b4b470aeee59209323ccb0d0
parent7086e6e5baae90047ecfb1416082409634868e66 (diff)
downloadlinux-7a7913f11ddf932e20d2bde72bec57f2f7a9b49e.tar.xz
iio: Add dev_to_iio_dev() helper function
This patch adds a helper function for retriving a iio_dev struct from a device struct. Currently we open-code this in two different ways. One is using dev_get_drvdata on the device and the other is using container_of. The new helper function uses the container_of solution as it creates slightly smaller code and also will eventually free up the drvdata pointer for usage by invidual drivers. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Acked-by: Jonathan Cameron <jic23@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--include/linux/iio/iio.h11
1 files changed, 11 insertions, 0 deletions
diff --git a/include/linux/iio/iio.h b/include/linux/iio/iio.h
index 897c6b01d784..3a4f6a3ab80d 100644
--- a/include/linux/iio/iio.h
+++ b/include/linux/iio/iio.h
@@ -427,6 +427,17 @@ static inline void iio_device_put(struct iio_dev *indio_dev)
put_device(&indio_dev->dev);
};
+/**
+ * dev_to_iio_dev() - Get IIO device struct from a device struct
+ * @dev: The device embedded in the IIO device
+ *
+ * Note: The device must be a IIO device, otherwise the result is undefined.
+ */
+static inline struct iio_dev *dev_to_iio_dev(struct device *dev)
+{
+ return container_of(dev, struct iio_dev, dev);
+}
+
/* Can we make this smaller? */
#define IIO_ALIGN L1_CACHE_BYTES
/**