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iio: Add dev_to_iio_dev() helper function

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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>
This commit is contained in:
Lars-Peter Clausen
2012-05-12 15:39:32 +02:00
committed by Greg Kroah-Hartman
parent 7086e6e5ba
commit 7a7913f11d
1 changed files with 11 additions and 0 deletions
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11
include/linux/iio/iio.h
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@@ -427,6 +427,17 @@ static inline void iio_device_put(struct iio_dev *indio_dev)
put_device(&indio_dev->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? */ /* Can we make this smaller? */
#define IIO_ALIGN L1_CACHE_BYTES #define IIO_ALIGN L1_CACHE_BYTES
/** /**