Re: ACPI ALS Status ?

[Jonathan Cameron <jic23@cam.ac.uk>]

On 5/21/2012 2:03 AM, Zhang Rui wrote:
> On 日, 2012-05-20 at 15:09 +0200, Corentin Chary wrote:
>> On Mon, Mar 5, 2012 at 10:12 AM, Corentin Chary
>> <corentin.chary@gmail.com>  wrote:
>>> On Sun, Nov 6, 2011 at 11:16 PM, Len Brown<lenb@kernel.org>  wrote:
>>>>> I was looking at the DSDT of a new samsung laptop (I can send you the
>>>>> output of acpidump if interested), and it export a standard ACPI ALS
>>>>> device. So, it's actually great to see vendor using that, but it seems
>>>>> that the series adding support for that and sent back in 2009 is not
>>>>> available in the kernel. I'd really like to use my the ALS, what's the
>>>>> current status of the driver ? Still blocked because we don't have a
>>>>> generic sysfs class ? If yes, can't we just use a non-standard
>>>>> interface ? It would still be better than no driver at all.
>>>>
>>>> Yes, I think ACPI ALS support has been waiting for hardware to justify
>>>> its existence.
>>>>
>>>> When it first entered the spec, we were excited to see it was present
>>>> in some high-end laptops, but IIR on closer examination the AML turned
>>>> out to be dummy code.
>>>>
>>>> If you can verify that your Samsung really does implement ACPI ALS,
>>>> then that is all we need to stumble forward.
>>>>
>>>> thanks,
>>>> -Len Brown, Intel Open Source Technology Center
>>>
>>> Hello,
>>>
>>> As stated in my previous mails, the implementation on this laptop is
>>> perfectly functional,  and since Windows 7 seems to be able to use
>>> ACPI ALS nativelly [1] I suspect new (high end ?) laptop will all
>>> support that.
>>> Is there any plan to revive this driver for 3.4 or 3.5 ? Should
>>> someone repost the last version of the previous patchset for
>>> discussion ?
>>> And no, on this laptop ALS is definitively not a gadget.
>>>
>>> Thanks,
>>>
>>> - http://download.microsoft.com/download/3/0/2/3027D574-C433-412A-A8B6-5E0A75D5B237/ambient-light-sensors.docx
>>
>> Adding more people that were interested in the previous discussion.
>> What was the exact status of the als class ? Rui Zhang are you still
>> interested in this ?
>> Thanks,
>>
> well, I need some time to get updated about this.
> Say I'm not sure if we still want to introduce an ALS class or we need
> to use drivers/staging/iio/ instead, today.
Shortly the IIO core should (*fingers crossed*) move to drivers/iio/ 
It's queue up for the next merge window.  driver/iio/light is probably
a suitable place for acpi light sensor drivers.  Don't think we've moved
any of the light sensors out of staging yet, but it's just a question of
no one having had time to check them thoroughly rather than a 
fundamental reason. At least one new sensor driver is targetting that 
location but is still going through revisions..

ALS as a separate class died when Linus said he wouldn't pull it.
>
> BTW, you own this laptop, right? Can you send me the model name of this
> laptop and its acpidump output?
>
> thanks,
> rui
>
>

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