iio: adc: max1363: sign-extend bipolar differential channel reads

Browse source

MAX1363 differential channels are bipolar, but max1363_read_single_chan()
masks the raw value to the ADC resolution without sign-extending it.
Negative differential readings are therefore reported to userspace as
large positive values (e.g. -1 as 4095 on a 12-bit part).

Sign-extend the masked value from the resolution bit for differential
channels. Single-ended channels are unipolar and are left unchanged.

Fixes: d1325cf450 ("Staging: IIO: max1363 ADC driver")
Cc: stable@vger.kernel.org
Assisted-by: Claude:claude-opus-4
Signed-off-by: Cong Nguyen <congnt264@gmail.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Signed-off-by: Jonathan Cameron <jonathan.cameron@oss.qualcomm.com>

...

This commit is contained in:

Cong Nguyen 2026-08-10 23:44:46 +07:00 • committed by Jonathan Cameron

parent fafefa925e

commit 91908c0a78

1 changed files with 8 additions and 0 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

8

drivers/iio/adc/max1363.c

View file