Check input to be sure it matches Semtech sx9310 specification and
can fit into debounce register.
Compare argument writen to thresh_.._period with read from same
sysfs attribute:
Before: Afer:
write | read write | read
-1 | 8 -1 fails: -EINVAL
0 | 8 0 | 0
1 | 0 1 | 0
2..15 | 2^log2(N) 2..15 | 2^log2(N)
16 | 0 >= 16 fails: -EINVAL
Fixes: 1b6872015f0b ("iio: sx9310: Support setting debounce values")
Signed-off-by: Gwendal Grignou <gwendal@xxxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
---
drivers/iio/proximity/sx9310.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/drivers/iio/proximity/sx9310.c b/drivers/iio/proximity/sx9310.c
index 578d8841c5398..e5a756f4afa2b 100644
--- a/drivers/iio/proximity/sx9310.c
+++ b/drivers/iio/proximity/sx9310.c
@@ -764,7 +764,11 @@ static int sx9310_write_far_debounce(struct sx9310_data *data, int val)
int ret;
unsigned int regval;
- val = ilog2(val);
+ if (val > 0)
+ val = ilog2(val);
+ if (!FIELD_FIT(SX9310_REG_PROX_CTRL10_FAR_DEBOUNCE_MASK, val))
+ return -EINVAL;
+
regval = FIELD_PREP(SX9310_REG_PROX_CTRL10_FAR_DEBOUNCE_MASK, val);
mutex_lock(&data->mutex);
@@ -781,7 +785,11 @@ static int sx9310_write_close_debounce(struct sx9310_data *data, int val)
int ret;
unsigned int regval;
- val = ilog2(val);
+ if (val > 0)
+ val = ilog2(val);
+ if (!FIELD_FIT(SX9310_REG_PROX_CTRL10_CLOSE_DEBOUNCE_MASK, val))
+ return -EINVAL;
+
regval = FIELD_PREP(SX9310_REG_PROX_CTRL10_CLOSE_DEBOUNCE_MASK, val);
mutex_lock(&data->mutex);
--
2.31.0.291.g576ba9dcdaf-goog
