From 7a7913f11ddf932e20d2bde72bec57f2f7a9b49e Mon Sep 17 00:00:00 2001 From: Lars-Peter Clausen Date: Sat, 12 May 2012 15:39:32 +0200 Subject: [PATCH] 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 Acked-by: Jonathan Cameron Signed-off-by: Greg Kroah-Hartman --- include/linux/iio/iio.h | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/include/linux/iio/iio.h b/include/linux/iio/iio.h index 897c6b01..3a4f6a3 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 /** -- 2.7.4