From: Gwendal Grignou gwendal@chromium.org
stable inclusion from stable-v5.10.85 commit fff92f3712d771103ca967dc8cb1180e5a48078a bugzilla: 186032 https://gitee.com/openeuler/kernel/issues/I4QVI4
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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commit 652e7df485c6884d552085ae2c73efa6cfea3547 upstream.
Use scan_type when processing raw data which also fixes that the sign extension was from the wrong bit.
Use channel definition as root of trust and replace constant when reading elements directly using the raw sysfs attributes.
Fixes: 6794e23fa3fe ("iio: adc: at91-sama5d2_adc: add support for oversampling resolution") Signed-off-by: Gwendal Grignou gwendal@chromium.org Reviewed-by: Eugen Hristev eugen.hristev@microchip.com Cc: Stable@vger.kernel.org Link: https://lore.kernel.org/r/20211104082413.3681212-9-gwendal@chromium.org Signed-off-by: Jonathan Cameron Jonathan.Cameron@huawei.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Chen Jun chenjun102@huawei.com Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com --- drivers/iio/adc/at91-sama5d2_adc.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/iio/adc/at91-sama5d2_adc.c b/drivers/iio/adc/at91-sama5d2_adc.c index b8139c435a4b..4ede7e766765 100644 --- a/drivers/iio/adc/at91-sama5d2_adc.c +++ b/drivers/iio/adc/at91-sama5d2_adc.c @@ -1401,7 +1401,8 @@ static int at91_adc_read_info_raw(struct iio_dev *indio_dev, *val = st->conversion_value; ret = at91_adc_adjust_val_osr(st, val); if (chan->scan_type.sign == 's') - *val = sign_extend32(*val, 11); + *val = sign_extend32(*val, + chan->scan_type.realbits - 1); st->conversion_done = false; }