linux-kernel - Re: [PATCH v5 5/7] iio: potentiometer: Add device specific read

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Date:   Sat, 26 Feb 2022 18:39:56 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Jagath Jog J <jagathjog1996@...il.com>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Slawomir Stepien <sst@...zta.fm>,
        Rob Herring <robh+dt@...nel.org>,
        linux-iio <linux-iio@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 5/7] iio: potentiometer: Add device specific read_raw
 function

On Thu, 24 Feb 2022 02:46:34 +0200
Andy Shevchenko <andy.shevchenko@...il.com> wrote:

> On Wed, Feb 23, 2022 at 6:35 PM Jagath Jog J <jagathjog1996@...il.com> wrote:
> >
> > Added function pointer in the device specific structure to
> > call the appropriate device read_raw function, so that the
> > other type of devices with different read method can be
> > handled.
> >
> > Signed-off-by: Jagath Jog J <jagathjog1996@...il.com>
> > ---
> >  drivers/iio/potentiometer/ds1803.c | 28 ++++++++++++++++++++++------
> >  1 file changed, 22 insertions(+), 6 deletions(-)
> >
> > diff --git a/drivers/iio/potentiometer/ds1803.c b/drivers/iio/potentiometer/ds1803.c
> > index aeb74ee46fbc..878188351f8f 100644
> > --- a/drivers/iio/potentiometer/ds1803.c
> > +++ b/drivers/iio/potentiometer/ds1803.c
> > @@ -32,6 +32,8 @@ struct ds1803_cfg {
> >         int kohms;
> >         const struct iio_chan_spec *channels;
> >         u8 num_channels;
> > +       int (*read)(struct iio_dev *indio_dev,
> > +                   struct iio_chan_spec const *chan, int *val);
> >  };
> >
> >  struct ds1803_data {
> > @@ -55,6 +57,22 @@ static const struct iio_chan_spec ds1803_channels[] = {
> >         DS1803_CHANNEL(1, DS1803_WIPER_1),
> >  };
> >
> > +static int ds1803_read(struct iio_dev *indio_dev,
> > +                      struct iio_chan_spec const *chan,
> > +                      int *val)
> > +{
> > +       struct ds1803_data *data = iio_priv(indio_dev);
> > +       int ret;
> > +       u8 result[ARRAY_SIZE(ds1803_channels)];
> > +
> > +       ret = i2c_master_recv(data->client, result, indio_dev->num_channels);
> > +       if (ret < 0)
> > +               return ret;
> > +
> > +       *val = result[chan->channel];
> > +       return ret;
> > +}
> > +
> >  static const struct ds1803_cfg ds1803_cfg[] = {
> >         [DS1803_010] = {
> >           .wipers = 2,
> > @@ -62,6 +80,7 @@ static const struct ds1803_cfg ds1803_cfg[] = {
> >           .kohms =  10,
> >           .channels = ds1803_channels,
> >           .num_channels = ARRAY_SIZE(ds1803_channels),
> > +         .read = ds1803_read,
> >         },
> >         [DS1803_050] = {
> >           .wipers = 2,
> > @@ -69,6 +88,7 @@ static const struct ds1803_cfg ds1803_cfg[] = {
> >           .kohms =  50,
> >           .channels = ds1803_channels,
> >           .num_channels = ARRAY_SIZE(ds1803_channels),
> > +         .read = ds1803_read,
> >         },
> >         [DS1803_100] = {
> >           .wipers = 2,
> > @@ -76,6 +96,7 @@ static const struct ds1803_cfg ds1803_cfg[] = {
> >           .kohms = 100,
> >           .channels = ds1803_channels,
> >           .num_channels = ARRAY_SIZE(ds1803_channels),
> > +         .read = ds1803_read,
> >         },
> >  };
> >
> > @@ -84,20 +105,15 @@ static int ds1803_read_raw(struct iio_dev *indio_dev,
> >                            int *val, int *val2, long mask)
> >  {
> >         struct ds1803_data *data = iio_priv(indio_dev);
> > -       int pot = chan->channel;
> >         int ret;
> > -       u8 result[ARRAY_SIZE(ds1803_channels)];
> >
> >         switch (mask) {
> >         case IIO_CHAN_INFO_RAW:
> > -               ret = i2c_master_recv(data->client, result,
> > -                                     indio_dev->num_channels);
> > +               ret = data->cfg->read(indio_dev, chan, val);
> >                 if (ret < 0)
> >                         return ret;
> >
> > -               *val = result[pot];
> >                 return IIO_VAL_INT;  
> 
> > -  
> 
> Seems like a stray change. Up to Jonathan to decide what to do (no
> need for resend b/c of this).

Good spot. Given I was tweaking this series a fair bit anyway whilst
applying I tidied this up as well.

Thanks,

Jonathan

> 
> >         case IIO_CHAN_INFO_SCALE:
> >                 *val = 1000 * data->cfg->kohms;
> >                 *val2 = data->cfg->avail[2]; /* Max wiper position */
> > --
> > 2.17.1
> >  
> 
>