Commit 9dbf8ccd authored Oct 15, 2012 by Lars-Peter Clausen Committed by Jonathan Cameron Oct 19, 2012

iio: Add some helper macros for unit conversion



Some datasheets use a different unit to specify the channel scale than what IIO
expects it to be. This patch adds two helper macros which allow to convert units
commonly used in datasheets to IIO units:

 * acceleration: g -> meter / second**2
 * angular velocity: degree (/ second) -> rad (/ second)

This makes it much more convenient to specify and also easier to verify a
channel's scale attribute.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

parent ddffeb8c

include/linux/iio/iio.h

+16 −0

Original line number	Diff line number	Diff line
		@@ -618,4 +618,20 @@ static inline struct dentry iio_get_debugfs_dentry(struct iio_dev indio_dev)
		};
		#endif

		/**
		* IIO_DEGREE_TO_RAD() - Convert degree to rad
		* @deg: A value in degree
		*
		* Returns the given value converted from degree to rad
		*/
		#define IIO_DEGREE_TO_RAD(deg) (((deg) * 314159ULL + 9000000ULL) / 18000000ULL)

		/**
		* IIO_G_TO_M_S_2() - Convert g to meter / second**2
		* @g: A value in g
		*
		* Returns the given value converted from g to meter / second**2
		*/
		#define IIO_G_TO_M_S_2(g) ((g) * 980665ULL / 100000ULL)

		#endif /* _INDUSTRIAL_IO_H_ */