linux-kernel - Re: [PATCH v7 8/8] iio: adc: ad7606: add support for AD7606C-{16,18} parts

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Message-ID: <CA+GgBR_HTwNT6WKdweuuTZ_t+ZmMXrMkYNK+b3pp4f2MmTWzGw@mail.gmail.com>
Date: Wed, 2 Oct 2024 09:12:09 +0300
From: Alexandru Ardelean <aardelean@...libre.com>
To: Jonathan Cameron <jic23@...nel.org>
Cc: David Lechner <dlechner@...libre.com>, linux-iio@...r.kernel.org, 
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org, krzk+dt@...nel.org, 
	robh@...nel.org, lars@...afoo.de, michael.hennerich@...log.com, 
	gstols@...libre.com
Subject: Re: [PATCH v7 8/8] iio: adc: ad7606: add support for AD7606C-{16,18} parts

On Tue, Oct 1, 2024 at 9:41 PM Jonathan Cameron <jic23@...nel.org> wrote:
>
> On Tue, 1 Oct 2024 08:42:23 -0500
> David Lechner <dlechner@...libre.com> wrote:
>
> > On 10/1/24 3:26 AM, Alexandru Ardelean wrote:
> > > On Thu, Sep 19, 2024 at 4:05 PM Alexandru Ardelean
> > > <aardelean@...libre.com> wrote:
> > >>
> >
> > ...
> >
> > >> @@ -153,7 +349,19 @@ static int ad7606_scan_direct(struct iio_dev *indio_dev, unsigned int ch,
> > >>         if (ret)
> > >>                 goto error_ret;
> > >>
> > >> -       *val = sign_extend32(st->data[ch], 15);
> > >> +       chan = &indio_dev->channels[ch + 1];
> > >> +       if (chan->scan_type.sign == 'u') {
> > >> +               if (storagebits > 16)
> > >> +                       *val = st->data.buf32[ch];
> > >> +               else
> > >> +                       *val = st->data.buf16[ch];
> > >> +               return 0;
> > >
> > > Arrggh...
> > > I messed up here.
> > > Guillaume found a bug here, where this should be "goto error_ret" or
> > > do an "if ()  {} else {}"
> > > How should we do it here?
> if / else. Goto an error label when it's not an error would be horrible!
> > >
> > > Do we send a fix-patch or send a new series?
> > >
> >
> > Since this patch is already applied, just follow up with another
> > patch with a Fixes: tag.
>
> I sometimes tweak these sort of things if I haven't pushed out
> as togreg yet (or they are really bad!) but in this case I'm not
> 100% sure what the comment is, so I'll just apply a fix on top.
>
> So David is entirely correct in general but by luck of timing
> this time I'll tweak it.
>
> Please check the result in iio.git/testing
> I'll hold off pushing that out as togreg until at least end of
> tomorrow.  One more day o

The "return 0" needs to be removed in the driver.

        if (chan->scan_type.sign == 'u') {
                if (storagebits > 16)
                        *val = st->data.buf32[ch];
                else
                        *val = st->data.buf16[ch];
-                return 0;
        } else {
                if (storagebits > 16)
                        *val = sign_extend32(st->data.buf32[ch], 17);
                else
                        *val = sign_extend32(st->data.buf16[ch], 15);
        }



>
> Jonathan
>
>
> >
> >
> >
>