linux-kernel - Re: [PATCH] iio: light: acpi-als: Report data as processed rather than raw

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Date:	Sat, 9 Jan 2016 16:31:24 +0000
From:	Jonathan Cameron <jic23@...nel.org>
To:	Gabriele Mazzotta <gabriele.mzt@...il.com>, knaack.h@....de,
	lars@...afoo.de, pmeerw@...erw.net
Cc:	marex@...x.de, marxin.liska@...il.com, linux-iio@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iio: light: acpi-als: Report data as processed rather
 than raw

On 07/01/16 15:21, Gabriele Mazzotta wrote:
> As per the ACPI specification (Revision 5.0) [1], the data coming
> from the sensor represent the ambient light illuminance reading
> expressed in lux. Use IIO_CHAN_INFO_PROCESSED instead of
> IIO_CHAN_INFO_RAW to signify that the data are pre-processed.
> 
> [1] http://www.acpi.info/DOWNLOADS/ACPIspec50.pdf
> 
> Signed-off-by: Gabriele Mazzotta <gabriele.mzt@...il.com>
Hm. Whilst it's a fix in a sense, the original didn't really 'break'
the ABI so I worry a little that this change may break others.
Irritating as it is, perhaps we should keep the _RAW and add _PROCESSED
(which will then be exactly the same value).
We'll also then need a comment in the code, that leaving the _RAW
elements was for ABI compatibility.

What do others think?

Jonathan
> ---
>  drivers/iio/light/acpi-als.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/iio/light/acpi-als.c b/drivers/iio/light/acpi-als.c
> index 60537ec..a53be07 100644
> --- a/drivers/iio/light/acpi-als.c
> +++ b/drivers/iio/light/acpi-als.c
> @@ -54,7 +54,7 @@ static const struct iio_chan_spec acpi_als_channels[] = {
>  			.realbits	= 32,
>  			.storagebits	= 32,
>  		},
> -		.info_mask_separate	= BIT(IIO_CHAN_INFO_RAW),
> +		.info_mask_separate	= BIT(IIO_CHAN_INFO_PROCESSED),
>  	},
>  };
>  
> @@ -152,7 +152,7 @@ static int acpi_als_read_raw(struct iio_dev *indio_dev,
>  	s32 temp_val;
>  	int ret;
>  
> -	if (mask != IIO_CHAN_INFO_RAW)
> +	if (mask != IIO_CHAN_INFO_PROCESSED)
>  		return -EINVAL;
>  
>  	/* we support only illumination (_ALI) so far. */
>