[v2 06/19] staging: iio: resolver: ad2s1210: always use 16-bit value for raw read

David Lechner
2023-09-21T17:51:33Z

This removes the special handling for resolutions lower than 16 bits.
This will allow us to use a fixed scale independent of the resolution.

Also, for the record, according to the datasheet, the logic for the
special handling based on hysteresis that was removed was incorrect.

Signed-off-by: David Lechner <dlechner@baylibre.com>
---
drivers/staging/iio/resolver/ad2s1210.c | 16 ++--------------
1 file changed, 2 insertions(+), 14 deletions(-)

diff --git a/drivers/staging/iio/resolver/ad2s1210.c b/drivers/staging/iio/resolver/ad2s1210.c
index 9c7f76114360..985b8fecd65a 100644
--- a/drivers/staging/iio/resolver/ad2s1210.c
+++ b/drivers/staging/iio/resolver/ad2s1210.c
@@ -465,10 +465,7 @@ static int ad2s1210_read_raw(struct iio_dev *indio_dev,
long m)
{
struct ad2s1210_state *st = iio_priv(indio_dev);
- u16 negative;
int ret = 0;
- u16 pos;
- s16 vel;

mutex_lock(&st->lock);
gpiod_set_value(st->gpios[AD2S1210_SAMPLE], 0);
@@ -494,20 +491,11 @@ static int ad2s1210_read_raw(struct iio_dev *indio_dev,

switch (chan->type) {
case IIO_ANGL:
- pos = be16_to_cpup((__be16 *)st->rx);
- if (st->hysteresis)
- pos >>= 16 - st->resolution;
- *val = pos;
+ *val = be16_to_cpup((__be16 *)st->rx);
ret = IIO_VAL_INT;
break;
case IIO_ANGL_VEL:
- vel = be16_to_cpup((__be16 *)st->rx);
- vel >>= 16 - st->resolution;
- if (vel & 0x8000) {
- negative = (0xffff >> st->resolution) << st->resolution;
- vel |= negative;
- }
- *val = vel;
+ *val = (s16)be16_to_cpup((__be16 *)st->rx);
ret = IIO_VAL_INT;
break;
default:
--
2.34.1