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staging: iio: resolver: ad2s1210: implement IIO_CHAN_INFO_SCALE

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This adds an implementation of IIO_CHAN_INFO_SCALE to the ad2s1210
resolver driver. This allows userspace to get the scale factor for the
raw values.

Signed-off-by: David Lechner <dlechner@baylibre.com>
Link: https://lore.kernel.org/r/20230929-ad2s1210-mainline-v3-8-fa4364281745@baylibre.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
David Lechner 2023-09-29 12:23:13 -05:00 committed by Jonathan Cameron
parent 1b6eba71ca
commit 4623b414e6
1 changed files with 45 additions and 8 deletions
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53
drivers/staging/iio/resolver/ad2s1210.c
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@ -461,13 +461,10 @@ error_ret:
return ret < 0 ? ret : len;
}
static int ad2s1210_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val,
int *val2,
long m)
static int ad2s1210_single_conversion(struct ad2s1210_state *st,
struct iio_chan_spec const *chan,
int *val)
{
struct ad2s1210_state *st = iio_priv(indio_dev);
int ret = 0;
mutex_lock(&st->lock);
@ -514,6 +511,44 @@ error_ret:
return ret;
}
static const int ad2s1210_velocity_scale[] = {
17089132, /* 8.192MHz / (2*pi * 2500 / 2^15) */
42722830, /* 8.192MHz / (2*pi * 1000 / 2^15) */
85445659, /* 8.192MHz / (2*pi * 500 / 2^15) */
341782638, /* 8.192MHz / (2*pi * 125 / 2^15) */
};
static int ad2s1210_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val,
int *val2,
long mask)
{
struct ad2s1210_state *st = iio_priv(indio_dev);
switch (mask) {
case IIO_CHAN_INFO_RAW:
return ad2s1210_single_conversion(st, chan, val);
case IIO_CHAN_INFO_SCALE:
switch (chan->type) {
case IIO_ANGL:
/* approx 0.3 arc min converted to radians */
*val = 0;
*val2 = 95874;
return IIO_VAL_INT_PLUS_NANO;
case IIO_ANGL_VEL:
*val = st->fclkin;
*val2 = ad2s1210_velocity_scale[st->resolution];
return IIO_VAL_FRACTIONAL;
default:
return -EINVAL;
}
default:
return -EINVAL;
}
}
static IIO_DEVICE_ATTR(fclkin, 0644,
ad2s1210_show_fclkin, ad2s1210_store_fclkin, 0);
static IIO_DEVICE_ATTR(fexcit, 0644,
@ -552,12 +587,14 @@ static const struct iio_chan_spec ad2s1210_channels[] = {
.type = IIO_ANGL,
.indexed = 1,
.channel = 0,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
BIT(IIO_CHAN_INFO_SCALE),
}, {
.type = IIO_ANGL_VEL,
.indexed = 1,
.channel = 0,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
BIT(IIO_CHAN_INFO_SCALE),
}
};