Re: [PATCH v2] iio: light: ltr501: return proper error code from ltr501_get_gain_index()

[Waqar Hameed <waqar.hameed@axis.com>]

On Mon, Feb 02, 2026 at 14:07 +0200 Antoniu Miclaus <antoniu.miclaus@analog.com> wrote:

> Return -EINVAL instead of -1 when no matching gain value is found
> in the gain table. Update the callers to propagate this error directly
> rather than overwriting it with -EINVAL.
>
> Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com>
> ---
> Changes in v2:
>  - Update callers to propagate the error directly instead of
>    overwriting it with -EINVAL.

For future reference, it's good practice to also have a link to v1. (No
need to resend for that)

>
>  drivers/iio/light/ltr501.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/iio/light/ltr501.c b/drivers/iio/light/ltr501.c
> index 022e0693983b..4d99ae336f61 100644
> --- a/drivers/iio/light/ltr501.c
> +++ b/drivers/iio/light/ltr501.c
> @@ -754,7 +754,7 @@ static int ltr501_get_gain_index(const struct ltr501_gain *gain, int size,
>  		if (val == gain[i].scale && val2 == gain[i].uscale)
>  			return i;
>  
> -	return -1;
> +	return -EINVAL;
>  }
>  
>  static int __ltr501_write_raw(struct iio_dev *indio_dev,
> @@ -773,7 +773,7 @@ static int __ltr501_write_raw(struct iio_dev *indio_dev,
>  						  info->als_gain_tbl_size,
>  						  val, val2);
>  			if (i < 0)
> -				return -EINVAL;
> +				return i;
>  
>  			data->als_contr &= ~info->als_gain_mask;
>  			data->als_contr |= i << info->als_gain_shift;
> @@ -785,7 +785,7 @@ static int __ltr501_write_raw(struct iio_dev *indio_dev,
>  						  info->ps_gain_tbl_size,
>  						  val, val2);
>  			if (i < 0)
> -				return -EINVAL;
> +				return i;
>  
>  			data->ps_contr &= ~LTR501_CONTR_PS_GAIN_MASK;
>  			data->ps_contr |= i << LTR501_CONTR_PS_GAIN_SHIFT;

This return-pattern is similar to how it is used in the other `case`s in
this function. Consistency is a nice trait to have in code :)

Reviewed-by: Waqar Hameed <waqar.hameed@axis.com>