Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit f9db7370 authored by David Veenstra's avatar David Veenstra Committed by Jonathan Cameron
Browse files

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: default avatarDavid Veenstra <davidjulianveenstra@gmail.com>
Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent d3e6ed84

drivers/staging/iio/resolver/ad2s1200.c

+6 −0
Original line number Diff line number Diff line
@@ -58,6 +58,11 @@ static int ad2s1200_read_raw(struct iio_dev *indio_dev, 
	switch (m) {

	case IIO_CHAN_INFO_SCALE:

		switch (chan->type) {

		case IIO_ANGL:

			/* 2 * Pi / (2^12 - 1) ~= 0.001534355 */

			*val = 0;

			*val2 = 1534355;

			return IIO_VAL_INT_PLUS_NANO;

		case IIO_ANGL_VEL:

			/* 2 * Pi ~= 6.283185 */

			*val = 6;
@@ -112,6 +117,7 @@ static const struct iio_chan_spec ad2s1200_channels[] = { 
		.indexed = 1,

		.channel = 0,

		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),

		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),

	}, {

		.type = IIO_ANGL_VEL,

		.indexed = 1,