On Mon, Feb 12, 2018 at 05:24:58PM +0530, Himanshu Jha wrote:
> Use sign_extend32 function instead of manually coding it. Also, adjust a
                                                            ^^^^^
> switch block to explicitly match channels and return -EINVAL as default
> case which improves code readability.

Greg likes to say something along the lines of "when you start your
sentence with "Also, " that could be a clue that it should be a separate
patch.".

> 
> Signed-off-by: Himanshu Jha <himanshujha199...@gmail.com>
> ---
>  drivers/staging/iio/accel/adis16201.c | 13 ++++++++-----
>  1 file changed, 8 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/staging/iio/accel/adis16201.c 
> b/drivers/staging/iio/accel/adis16201.c
> index 011d2c5..6800347 100644
> --- a/drivers/staging/iio/accel/adis16201.c
> +++ b/drivers/staging/iio/accel/adis16201.c
> @@ -112,12 +112,17 @@ static int adis16201_read_raw(struct iio_dev *indio_dev,
>       case IIO_CHAN_INFO_SCALE:
>               switch (chan->type) {
>               case IIO_VOLTAGE:
> -                     if (chan->channel == 0) {
> +                     switch (chan->channel) {
> +                     case 0:
>                               *val = 1;
>                               *val2 = 220000;
> -                     } else {
> +                             break;
> +                     case 1:
>                               *val = 0;
>                               *val2 = 610000;
> +                             break;
> +                     default:
> +                             return -EINVAL;
>                       }

I don't think this improves readability.  The -EINVAL is to handle a
driver bug which we haven't introduced yet.  Probably we would be better
off printing a warning or something?  But it feels weird to introduce so
much code to handle a bug which would actually be pretty difficult to
write.  The original code is fine.

>                       return IIO_VAL_INT_PLUS_MICRO;
>               case IIO_TEMP:
> @@ -155,9 +160,7 @@ static int adis16201_read_raw(struct iio_dev *indio_dev,
>               if (ret)
>                       return ret;
>  
> -             val16 &= (1 << bits) - 1;
> -             val16 = (s16)(val16 << (16 - bits)) >> (16 - bits);
> -             *val = val16;
> +             *val = sign_extend32(val16, bits - 1);

Yeah.  This is a nice clean up.

regards,
dan carpenter

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