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Commit d3e6ed84 authored by David Veenstra's avatar David Veenstra Committed by Jonathan Cameron
Browse files

staging: iio: ad2s1200: Add scaling factor for angular velocity channel 



The sysfs iio ABI states radians per second is expected as the unit for
angular velocity, but the 12-bit angular velocity register has
revolution per seconds as its unit. So a scaling factor of approximately
2 * Pi is added to the angular velocity channel.

Signed-off-by: default avatarDavid Veenstra <davidjulianveenstra@gmail.com>
Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent 2363c010

drivers/staging/iio/resolver/ad2s1200.c

+45 −26
Original line number Diff line number Diff line
@@ -55,6 +55,19 @@ static int ad2s1200_read_raw(struct iio_dev *indio_dev, 
	struct ad2s1200_state *st = iio_priv(indio_dev);

	int ret;



	switch (m) {

	case IIO_CHAN_INFO_SCALE:

		switch (chan->type) {

		case IIO_ANGL_VEL:

			/* 2 * Pi ~= 6.283185 */

			*val = 6;

			*val2 = 283185;

			return IIO_VAL_INT_PLUS_MICRO;

		default:

			return -EINVAL;

		}

		break;

	case IIO_CHAN_INFO_RAW:

		mutex_lock(&st->lock);

		gpiod_set_value(st->sample, 0);
@@ -86,6 +99,11 @@ static int ad2s1200_read_raw(struct iio_dev *indio_dev, 
		mutex_unlock(&st->lock);



		return IIO_VAL_INT;

	default:

		break;

	}



	return -EINVAL;

}



static const struct iio_chan_spec ad2s1200_channels[] = {
@@ -99,6 +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),

	}

};