From: David Veenstra Date: Fri, 18 May 2018 18:23:14 +0000 (+0200) Subject: staging: iio: ad2s1200: Add scaling factor for angle channel X-Git-Tag: v4.18-rc1~83^2~119^2~13 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=f9db7370be0e93ce4264781e1ada631a32a61e9b;p=thirdparty%2Fkernel%2Flinux.git 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 Signed-off-by: Jonathan Cameron --- diff --git a/drivers/staging/iio/resolver/ad2s1200.c b/drivers/staging/iio/resolver/ad2s1200.c index 7b8af558e9210..10d6d79dce79d 100644 --- a/drivers/staging/iio/resolver/ad2s1200.c +++ b/drivers/staging/iio/resolver/ad2s1200.c @@ -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,