Re: [PATCH 2/5] power: supply: bd71828: Fix current direction

On Wed, 12 Aug 2026 11:17:36 +0300
Andy Shevchenko <[email protected]> wrote:

> On Wed, Aug 12, 2026 at 10:10:50AM +0200, Andreas Kemnade wrote:
> > On Mon, 10 Aug 2026 13:09:07 +0300
> > Matti Vaittinen <[email protected]> wrote:  
> 
> ...
> 
> > That code is complicated. What about a generic 16bit non_2complemented sign
> > to 2-complemented sign function/macro. Such would have prevented the error
> > in the first places. So &vals[i] = signbit_to_2complement(be16_to_cpu(tmp_curr), 15) * pwr->curr_factor  
> 
> Do you mean existing sign_extend32() from bitops.h?
> 

I don't think it does what is needed. Here we have

0000 0000 0000 0001 -> 1
Usually we have

1111 1111 1111 1111 -> -1

but here

1000 0000 0000 0001 -> -1

If I do understand things correctly. I not find something useful
in bitops.h.

Regards,
Andreas