[lkml]   [2016]   [Jan]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH] iio: light: acpi-als: Report data as processed rather than raw
2016-01-11 20:18 GMT+01:00 Jonathan Cameron <>:
> On 09/01/16 17:27, Marek Vasut wrote:
>> On Saturday, January 09, 2016 at 05:31:24 PM, Jonathan Cameron wrote:
>>> 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]
>>>> Signed-off-by: Gabriele Mazzotta <>
>>> 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?
>> I'm not an IIO guru, but this does sound sensible. Do you know if any userland
>> code which actually uses the ACPI ALS already ?
> It's more than likely as Gnome at least supports using them to control screen
> brightness. Hopefully that code is able to cope with the correct ABI though as
> well as the old one. Anyhow, we seem to have a reasonable consensus.

I looked into this and Gnome uses iio-proxy-sensor to handle iio
devices. As of now it, only looks for in_illuminance_input, so it
currently doesn't work with acpi-als. I've also found a bug report [1]
of an acpi-als user stating the same.


> Gabriele, are you happy to do a version of the patch with the _RAW version
> left along side your _PROCESSED version and a comment saying that it is for
> compatibility only?
> Jonathan
>> Best regards,
>> Marek Vasut
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-iio" in
>> the body of a message to
>> More majordomo info at

 \ /
  Last update: 2016-01-12 17:21    [W:0.095 / U:2.728 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site