Re: [PATCH 3/4] iio: ltr501: ltr501_read_ps(): add missing endianness conversion

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 10.06.2021 16:21:30, Andy Shevchenko wrote:
> On Thu, Jun 10, 2021 at 3:55 PM Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx> wrote:
> >
> > From: Oliver Lang <Oliver.Lang@xxxxxxxxxxxxxxxxxxx>
> >
> > The PS ADC Channel data is spread over 2 registers in little-endian
> > form. This patch adds the missing endianness conversion.
> >
> > Fixes: 2690be905123 ("iio: Add Lite-On ltr501 ambient light / proximity sensor driver")
> > Signed-off-by: Oliver Lang <Oliver.Lang@xxxxxxxxxxxxxxxxxxx>
> > Signed-off-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
> > ---
> >  drivers/iio/light/ltr501.c | 16 ++++++----------
> >  1 file changed, 6 insertions(+), 10 deletions(-)
> >
> > diff --git a/drivers/iio/light/ltr501.c b/drivers/iio/light/ltr501.c
> > index 79898b72fe73..0e3f97ef3cdd 100644
> > --- a/drivers/iio/light/ltr501.c
> > +++ b/drivers/iio/light/ltr501.c
> > @@ -407,20 +407,16 @@ static int ltr501_read_als(const struct ltr501_data *data, __le16 buf[2])
> >                                 buf, 2 * sizeof(__le16));
> >  }
> >
> > -static int ltr501_read_ps(const struct ltr501_data *data)
> > +static int ltr501_read_ps(const struct ltr501_data *data, __le16 *buf)
> >  {
> > -       int ret, status;
> > +       int ret;
> >
> >         ret = ltr501_drdy(data, LTR501_STATUS_PS_RDY);
> >         if (ret < 0)
> >                 return ret;
> >
> > -       ret = regmap_bulk_read(data->regmap, LTR501_PS_DATA,
> > -                              &status, 2);
> > -       if (ret < 0)
> > -               return ret;
> > -
> > -       return status;
> > +       return regmap_bulk_read(data->regmap, LTR501_PS_DATA,
> > +                               buf, sizeof(__le16));
> 
> This is slightly weird since we pass a pointer to a buffer of one
> element (buffer can be longer, but here it's always one element is in
> use). The original code is better (initially). Also making caller to
> do endiannes conversion each time is not good.

We decided to implement the same semantics as ltr501_read_als(), where
the caller does the endianness conversion. I'll change the code and send
a v2 (with a proper cover letter subject :))

regards,
Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde           |
Embedded Linux                   | https://www.pengutronix.de  |
Vertretung West/Dortmund         | Phone: +49-231-2826-924     |
Amtsgericht Hildesheim, HRA 2686 | Fax:   +49-5121-206917-5555 |

Attachment: signature.asc
Description: PGP signature


[Index of Archives]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Yosemite News]     [Linux Input]     [Linux Kernel]     [Linux SCSI]     [X.org]

  Powered by Linux