This is a note to let you know that I've just added the patch titled
iio: adc: ad7606: fix oversampling gpio array
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
iio-adc-ad7606-fix-oversampling-gpio-array.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 6c5b28e90cf641751287e9752cfa902e78fbd9aa
Author: Guillaume Stols <gstols@xxxxxxxxxxxx>
Date: Tue Jul 2 17:34:10 2024 +0000
iio: adc: ad7606: fix oversampling gpio array
[ Upstream commit 8dc4594b54dbaaba40dc8884ad3d42083de39434 ]
gpiod_set_array_value was misused here: the implementation relied on the
assumption that an unsigned long was required for each gpio, while the
function expects a bit array stored in "as much unsigned long as needed
for storing one bit per GPIO", i.e it is using a bit field.
This leaded to incorrect parameter passed to gpiod_set_array_value, that
would set 1 value instead of 3.
It also prevents to select the software mode correctly for the AD7606B.
Fixes: d2a415c86c6b ("iio: adc: ad7606: Add support for AD7606B ADC")
Fixes: 41f71e5e7daf ("staging: iio: adc: ad7606: Use find_closest() macro")
Signed-off-by: Guillaume Stols <gstols@xxxxxxxxxxxx>
Reviewed-by: Nuno Sa <nuno.sa@xxxxxxxxxx>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/iio/adc/ad7606.c b/drivers/iio/adc/ad7606.c
index 1c08c0921ee71..8c66b1e364014 100644
--- a/drivers/iio/adc/ad7606.c
+++ b/drivers/iio/adc/ad7606.c
@@ -215,9 +215,9 @@ static int ad7606_write_os_hw(struct iio_dev *indio_dev, int val)
struct ad7606_state *st = iio_priv(indio_dev);
DECLARE_BITMAP(values, 3);
- values[0] = val;
+ values[0] = val & GENMASK(2, 0);
- gpiod_set_array_value(ARRAY_SIZE(values), st->gpio_os->desc,
+ gpiod_set_array_value(st->gpio_os->ndescs, st->gpio_os->desc,
st->gpio_os->info, values);
/* AD7616 requires a reset to update value */
diff --git a/drivers/iio/adc/ad7606_spi.c b/drivers/iio/adc/ad7606_spi.c
index 263a778bcf253..287a0591533b6 100644
--- a/drivers/iio/adc/ad7606_spi.c
+++ b/drivers/iio/adc/ad7606_spi.c
@@ -249,8 +249,9 @@ static int ad7616_sw_mode_config(struct iio_dev *indio_dev)
static int ad7606B_sw_mode_config(struct iio_dev *indio_dev)
{
struct ad7606_state *st = iio_priv(indio_dev);
- unsigned long os[3] = {1};
+ DECLARE_BITMAP(os, 3);
+ bitmap_fill(os, 3);
/*
* Software mode is enabled when all three oversampling
* pins are set to high. If oversampling gpios are defined
@@ -258,7 +259,7 @@ static int ad7606B_sw_mode_config(struct iio_dev *indio_dev)
* otherwise, they must be hardwired to VDD
*/
if (st->gpio_os) {
- gpiod_set_array_value(ARRAY_SIZE(os),
+ gpiod_set_array_value(st->gpio_os->ndescs,
st->gpio_os->desc, st->gpio_os->info, os);
}
/* OS of 128 and 256 are available only in software mode */
