[PATCH v2] iio: proximity: sx9310: report a hysteresis of 0 when it is disabled

[Arnav Kapoor <kapoorarnav43@gmail.com>]

sx9310_read_hysteresis() turns a PROXHYST value of 0 (no hysteresis)
into a shift of 0 and reports the full threshold, which writing back
then usually fails with -EINVAL. Report 0, as sx9324 and sx9360 do.

Fixes: 08f0411c48f2 ("iio: sx9310: Support setting hysteresis values")
Signed-off-by: Arnav Kapoor <kapoorarnav43@gmail.com>
---
Changes in v2:
- Invert the conditional (Andy)

v1: https://lore.kernel.org/all/20261026100041.16018-1-kapoorarnav43@gmail.com/

Compile-tested only (W=1); I don't have SX9310 hardware.

 drivers/iio/proximity/sx9310.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/iio/proximity/sx9310.c b/drivers/iio/proximity/sx9310.c
index 79ba46d8a0aa..dc1b1c3f4776 100644
--- a/drivers/iio/proximity/sx9310.c
+++ b/drivers/iio/proximity/sx9310.c
@@ -446,11 +446,10 @@ static int sx9310_read_hysteresis(struct sx_common_data *data,
 		return ret;
 
 	regval = FIELD_GET(SX9310_REG_PROX_CTRL10_HYST_MASK, regval);
-	if (!regval)
-		regval = 5;
-
-	/* regval is at most 5 */
-	*val = pthresh >> (5 - regval);
+	if (regval)
+		*val = pthresh >> (5 - regval);
+	else
+		*val = 0;
 
 	return IIO_VAL_INT;
 }

base-commit: 2ef6f5c4ee56e90c237c5f7687f09e635f7d30a9
-- 
2.53.0