The angle channel is not defined in sysfs iio ABI. So it is replaced
with an inclination channel, because it is defined in the ABI, and has the
semantics of an angle.
In addition, a fractional scaling factor of 360 / (2^12 -1) is added,
to scale the 12-bits angular position to degrees, conform the ABI.
Signed-off-by: David Veenstra <davidjulianveenstra@xxxxxxxxx>
---
drivers/staging/iio/resolver/ad2s1200.c | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)
diff --git a/drivers/staging/iio/resolver/ad2s1200.c b/drivers/staging/iio/resolver/ad2s1200.c
index 4b97a106012c..937676bcc0d4 100644
--- a/drivers/staging/iio/resolver/ad2s1200.c
+++ b/drivers/staging/iio/resolver/ad2s1200.c
@@ -64,6 +64,10 @@ static int ad2s1200_read_raw(struct iio_dev *indio_dev,
switch (m) {
case IIO_CHAN_INFO_SCALE:
switch (chan->type) {
+ case IIO_INCLI:
+ *val = 360;
+ *val2 = 0xFFF;
+ return IIO_VAL_FRACTIONAL;
case IIO_ANGL_VEL:
/*
* 2 * Pi is almost equal to
@@ -91,7 +95,7 @@ static int ad2s1200_read_raw(struct iio_dev *indio_dev,
/* delay (6 * AD2S1200_TSCLK + 20) nano seconds */
udelay(1);
gpiod_set_value(st->sample, 1);
- gpiod_set_value(st->rdvel, !!(chan->type == IIO_ANGL));
+ gpiod_set_value(st->rdvel, !!(chan->type == IIO_INCLI));
ret = spi_read(st->sdev, st->rx, 2);
if (ret < 0) {
@@ -101,7 +105,7 @@ static int ad2s1200_read_raw(struct iio_dev *indio_dev,
vel = be16_to_cpup((__be16 *)st->rx);
switch (chan->type) {
- case IIO_ANGL:
+ case IIO_INCLI:
*val = vel >> 4;
ret = IIO_VAL_INT;
break;
@@ -128,10 +132,11 @@ static int ad2s1200_read_raw(struct iio_dev *indio_dev,
static const struct iio_chan_spec ad2s1200_channels[] = {
{
- .type = IIO_ANGL,
+ .type = IIO_INCLI,
.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,
--
2.16.2
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