diff options
| author | Gwendal Grignou <gwendal@chromium.org> | 2021-03-31 20:22:22 +0200 |
|---|---|---|
| committer | Jonathan Cameron <Jonathan.Cameron@huawei.com> | 2021-04-07 09:36:40 +0200 |
| commit | fc948409ccc1e8afe8655cee77c686eedbfbee60 (patch) | |
| tree | 9e6b25f7719314bfa4eb82e1662e8acd66b832f5 /drivers/iio | |
| parent | iio: sx9310: Fix access to variable DT array (diff) | |
| download | linux-fc948409ccc1e8afe8655cee77c686eedbfbee60.tar.xz linux-fc948409ccc1e8afe8655cee77c686eedbfbee60.zip | |
iio: sx9310: Fix write_.._debounce()
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@chromium.org>
Cc: stable@vger.kernel.org
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Link: https://lore.kernel.org/r/20210331182222.219533-1-gwendal@chromium.org
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Diffstat (limited to 'drivers/iio')
| -rw-r--r-- | drivers/iio/proximity/sx9310.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/drivers/iio/proximity/sx9310.c b/drivers/iio/proximity/sx9310.c index 289c76bb3b02..327ebb7ddbb9 100644 --- a/drivers/iio/proximity/sx9310.c +++ b/drivers/iio/proximity/sx9310.c @@ -763,7 +763,11 @@ 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); @@ -780,7 +784,11 @@ 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); |