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iio: adc: ad7606: fix oversampling gpio array

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[ Upstream commit 8dc4594b54 ]

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: d2a415c86c ("iio: adc: ad7606: Add support for AD7606B ADC")
Fixes: 41f71e5e7d ("staging: iio: adc: ad7606: Use find_closest() macro")
Signed-off-by: Guillaume Stols <gstols@baylibre.com>
Reviewed-by: Nuno Sa <nuno.sa@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Guillaume Stols 2024-07-02 17:34:10 +00:00 committed by Greg Kroah-Hartman
parent 30b9bf4b41
commit 4861770740
2 changed files with 5 additions and 4 deletions
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4
drivers/iio/adc/ad7606.c
View File

@ -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 */

5
drivers/iio/adc/ad7606_spi.c
View File

@ -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 */