staging: iio: ad2s1200: Add scaling factor for angle channel
A scaling factor of approximately 2 * Pi / (2^12 -1) is added, to scale the 12-bits angular position to radians. A return type of IIO_VAL_INT_PLUS_NANO is used, so that the scale of both the angle channel and angular velocity channel has 7 significant digits. Signed-off-by: David Veenstra <davidjulianveenstra@gmail.com> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
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