linux-kernel - Re: [PATCH] eeepc-laptop: enable camera by default

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Date:	Sat, 6 Jun 2009 09:12:08 +0200
From:	Corentin Chary <corentin.chary@...il.com>
To:	Woody Suwalski <woodys@...dros.com>
Cc:	Pekka J Enberg <penberg@...helsinki.fi>,
	acpi4asus-user@...ts.sourceforge.net, len.brown@...el.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] eeepc-laptop: enable camera by default

On Fri, Jun 5, 2009 at 11:01 PM, Woody Suwalski<woodys@...dros.com> wrote:
> Corentin Chary wrote:
>>
>> On Fri, Jun 5, 2009 at 10:59 AM, Pekka J Enberg<penberg@...helsinki.fi>
>> wrote:
>>
>>>
>>> From: Pekka Enberg <penberg@...helsinki.fi>
>>>
>>> If we leave the camera disabled by default, userspace programs (e.g.
>>> Skype, Cheese) leave the user out in the cold saying that the machine
>>> "has
>>> no camera." Therefore, it's better to enable camera by default and let
>>> people who really don't want it just disable the thing.
>>>
>>> Cc: <acpi4asus-user@...ts.sourceforge.net>
>>> Cc: Len Brown <len.brown@...el.com>
>>> Signed-off-by: Pekka Enberg <penberg@...helsinki.fi>
>>> ---
>>>  drivers/platform/x86/eeepc-laptop.c |   16 ++++++++++++++++
>>>  1 files changed, 16 insertions(+), 0 deletions(-)
>>>
>>> diff --git a/drivers/platform/x86/eeepc-laptop.c
>>> b/drivers/platform/x86/eeepc-laptop.c
>>> index 353a898..c0f8eb1 100644
>>> --- a/drivers/platform/x86/eeepc-laptop.c
>>> +++ b/drivers/platform/x86/eeepc-laptop.c
>>> @@ -334,6 +334,19 @@ static int eeepc_bluetooth_rfkill_state(void *data,
>>> enum rfkill_state *state)
>>>  }
>>>
>>>  /*
>>> + * Camera helpers
>>> + */
>>> +
>>> +static void eeepc_enable_camera(void)
>>> +{
>>> +       int err;
>>> +
>>> +       err = set_acpi(CM_ASL_CAMERA, 1);
>>> +       if (err)
>>> +               printk(EEEPC_WARNING "Unable to enable camera %d\n",
>>> err);
>>> +}
>>> +
>>> +/*
>>>  * Sys helpers
>>>  */
>>>  static int parse_arg(const char *buf, unsigned long count, int *val)
>>> @@ -996,6 +1009,9 @@ static int __init eeepc_laptop_init(void)
>>>       result = eeepc_hwmon_init(dev);
>>>       if (result)
>>>               goto fail_hwmon;
>>> +
>>> +       eeepc_enable_camera();
>>> +
>>>       /* Register platform stuff */
>>>       result = platform_driver_register(&platform_driver);
>>>       if (result)
>>> --
>>> 1.5.6.3
>>>
>>>
>>>
>>
>> Hi,
>> First, I think a one line
>> set_acpi(CM_ASL_CAMERA, 1);
>> with a small comment is better. (If it fails, it's because there no
>> camera, so we don't mind).
>>
>> Anyway, I'm not sure it's a good idea to enable the camera by default.
>> It depends how many
>> power the camera is using (when idle). Coud you check that (with power
>> top maybe ?).
>>
>> Thanks
>>
>
> From our old measurements:
>
> idle camera is ~20mA out of ~650mA total power... (measured on 901 model).
>
> Woody
>
> --
> Woody Suwalski, Xandros, Ottawa, Canada, 1-613-842-3498 x414
>
>

Do also have some results with
echo -n auto > /sys/bus/usb/drivers/uvcvideo/*:*/../power/level

?
Thanks

-- 
Corentin Chary
http://xf.iksaif.net - http://uffs.org
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