linux-kernel - Re: [PATCH v2 1/2] staging: iio: ad7780: check if ad778x before gain update

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Date:   Fri, 9 Nov 2018 20:15:45 -0200
From:   Giuliano Augusto Faulin Belinassi <giuliano.belinassi@....br>
To:     tduszyns@...il.com
Cc:     giuliano.belinassi@...il.com, lars@...afoo.de,
        Michael.Hennerich@...log.com, jic23@...nel.org, knaack.h@....de,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        gregkh@...uxfoundation.org, Renato Geh <renatogeh@...il.com>,
        linux-iio@...r.kernel.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org,
        Kernel USP <kernel-usp@...glegroups.com>
Subject: Re: [PATCH v2 1/2] staging: iio: ad7780: check if ad778x before gain update

> Just some random though. Instead of introducing extra level of indentation you
> can simply check whether is_ad778x is asserted and simply return.

I agree that the patch would be smaller if I do that, but is it really
an issue? If yes, then I will update the patch with this change

> Any reason for setting this explicitly? That's going to be false anyway

It seems clearer to me :-)
On Thu, Nov 8, 2018 at 4:26 PM Tomasz Duszynski <tduszyns@...il.com> wrote:
>
> Hi Giuliano,
>
> Comment inline.
>
> On 11/8/18 2:03 PM, Giuliano Belinassi wrote:
> > Only the ad778x have the 'gain' status bit. Check it before updating
> > through a new variable is_ad778x in chip_info.
> >
> > Signed-off-by: Giuliano Belinassi <giuliano.belinassi@....br>
> > ---
> > Changes in v2:
> >       - Squashed is_ad778x declaration commit with the ad778x checkage
> >       - Changed is_ad778x type to bool
> >
> >  drivers/staging/iio/adc/ad7780.c | 15 +++++++++++----
> >  1 file changed, 11 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/staging/iio/adc/ad7780.c b/drivers/staging/iio/adc/ad7780.c
> > index 91e016d534ed..9ec2b002539e 100644
> > --- a/drivers/staging/iio/adc/ad7780.c
> > +++ b/drivers/staging/iio/adc/ad7780.c
> > @@ -35,6 +35,7 @@ struct ad7780_chip_info {
> >       struct iio_chan_spec    channel;
> >       unsigned int            pattern_mask;
> >       unsigned int            pattern;
> > +     bool                    is_ad778x;
> >  };
> >
> >  struct ad7780_state {
> > @@ -113,10 +114,12 @@ static int ad7780_postprocess_sample(struct ad_sigma_delta *sigma_delta,
> >           ((raw_sample & chip_info->pattern_mask) != chip_info->pattern))
> >               return -EIO;
> >
> > -     if (raw_sample & AD7780_GAIN)
> > -             st->gain = 1;
> > -     else
> > -             st->gain = 128;
> > +     if (chip_info->is_ad778x) {
> > +             if (raw_sample & AD7780_GAIN)
> > +                     st->gain = 1;
> > +             else
> > +                     st->gain = 128;
> > +     }
>
> Just some random though. Instead of introducing extra level of indentation you
> can simply check whether is_ad778x is asserted and simply return.
>
> >
> >       return 0;
> >  }
> > @@ -135,21 +138,25 @@ static const struct ad7780_chip_info ad7780_chip_info_tbl[] = {
> >               .channel = AD7780_CHANNEL(12, 24),
> >               .pattern = 0x5,
> >               .pattern_mask = 0x7,
> > +             .is_ad778x = false,
>
> Any reason for setting this explicitly? That's going to be false anyway.
>
> >       },
> >       [ID_AD7171] = {
> >               .channel = AD7780_CHANNEL(16, 24),
> >               .pattern = 0x5,
> >               .pattern_mask = 0x7,
> > +             .is_ad778x = false,
> >       },
> >       [ID_AD7780] = {
> >               .channel = AD7780_CHANNEL(24, 32),
> >               .pattern = 0x1,
> >               .pattern_mask = 0x3,
> > +             .is_ad778x = true,
> >       },
> >       [ID_AD7781] = {
> >               .channel = AD7780_CHANNEL(20, 32),
> >               .pattern = 0x1,
> >               .pattern_mask = 0x3,
> > +             .is_ad778x = true,
> >       },
> >  };
> >
>
> --
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