linux-kernel - Re: [PATCH v3 05/10] iio: afe: rescale: add INT_PLUS

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Date:   Sun, 4 Jul 2021 17:37:54 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Liam Beguin <liambeguin@...il.com>
Cc:     peda@...ntia.se, lars@...afoo.de, pmeerw@...erw.net,
        linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org,
        devicetree@...r.kernel.org, robh+dt@...nel.org
Subject: Re: [PATCH v3 05/10] iio: afe: rescale: add INT_PLUS_{MICRO,NANO}
 support

On Wed, 30 Jun 2021 21:00:29 -0400
Liam Beguin <liambeguin@...il.com> wrote:

> From: Liam Beguin <lvb@...hos.com>
> 
> Add IIO_VAL_INT_PLUS_{NANO,MICRO} scaling support.
> Scale the integer part and the decimal parts individually and keep the
> original scaling type.
> 
> Signed-off-by: Liam Beguin <lvb@...hos.com>
> ---
>  drivers/iio/afe/iio-rescale.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/drivers/iio/afe/iio-rescale.c b/drivers/iio/afe/iio-rescale.c
> index 98bcb5d418d6..8f79c582519c 100644
> --- a/drivers/iio/afe/iio-rescale.c
> +++ b/drivers/iio/afe/iio-rescale.c
> @@ -87,7 +87,16 @@ static int rescale_read_raw(struct iio_dev *indio_dev,
>  			do_div(tmp, 1000000000LL);
>  			*val = tmp;
>  			return ret;
> +		case IIO_VAL_INT_PLUS_NANO:
> +			fallthrough;

As earlier, I'm fairly sure you don't need this (but I could be wrong,
so if I am wrong point me at a reference).

> +		case IIO_VAL_INT_PLUS_MICRO:
> +			tmp = (s64)*val * rescale->numerator;
> +			*val = div_s64(tmp, rescale->denominator);
> +			tmp = (s64)*val2 * rescale->numerator;
> +			*val2 = div_s64(tmp, rescale->denominator);
> +			return ret;
>  		default:
> +			dev_err(&indio_dev->dev, "unsupported type %d\n", ret);
>  			return -EOPNOTSUPP;
>  		}
>  	default: