Re: [PATCH v2 2/2] iio: potentiometer: Add driver support for AD5110

On Wed, Aug 11, 2021 at 07:06:43PM +0300, Andy Shevchenko wrote:

On Wed, Aug 11, 2021 at 11:15 AM Lars-Peter Clausen [off-list ref] wrote:

quoted

On 8/10/21 2:49 PM, Andy Shevchenko wrote:

quoted

quoted

+       data->tol = data->cfg->kohms * (val & GENMASK(6, 0)) * 10 / 8;
+       if (!(val & BIT(7)))
+               data->tol *= -1;

Shouldn't you simple use corresponding sign_extend*()?

The data is encoded a sign-magnitude. sign_extend() works for two's
complement numbers.

Good catch!
I'm wondering if it's a good idea to have a sign_magnitude_to_int()
helper or so?

So, What should I do now?

-- 
With Best Regards,
Andy Shevchenko