linux-kernel - Re: [PATCH/RFC v8 03/14] Documentation: leds: Add description of v4l2-flash sub-device

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Date:	Fri, 5 Dec 2014 11:50:01 -0800
From:	Bryan Wu <cooloney@...il.com>
To:	Jacek Anaszewski <j.anaszewski@...sung.com>
Cc:	Linux LED Subsystem <linux-leds@...r.kernel.org>,
	"linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	b.zolnierkie@...sung.com, Pavel Machek <pavel@....cz>,
	"rpurdie@...ys.net" <rpurdie@...ys.net>,
	Sakari Ailus <sakari.ailus@....fi>,
	Sylwester Nawrocki <s.nawrocki@...sung.com>
Subject: Re: [PATCH/RFC v8 03/14] Documentation: leds: Add description of
 v4l2-flash sub-device

On Fri, Nov 28, 2014 at 1:17 AM, Jacek Anaszewski
<j.anaszewski@...sung.com> wrote:
> This patch extends LED Flash class documention by
> the description of interactions with v4l2-flash sub-device.
>
> Signed-off-by: Jacek Anaszewski <j.anaszewski@...sung.com>
> Acked-by: Kyungmin Park <kyungmin.park@...sung.com>
> Cc: Bryan Wu <cooloney@...il.com>
> Cc: Richard Purdie <rpurdie@...ys.net>
> ---

This patch looks good to me. I will take it with other patches!

Thanks,
-Bryan

>  Documentation/leds/leds-class-flash.txt |   13 +++++++++++++
>  1 file changed, 13 insertions(+)
>
> diff --git a/Documentation/leds/leds-class-flash.txt b/Documentation/leds/leds-class-flash.txt
> index d68565c..1a611ec 100644
> --- a/Documentation/leds/leds-class-flash.txt
> +++ b/Documentation/leds/leds-class-flash.txt
> @@ -46,3 +46,16 @@ Following sysfs attributes are exposed for controlling flash led devices:
>                          until this flag is no longer set
>                 * 0x100 - the temperature of the LED has exceeded its allowed
>                           upper limit
> +
> +A LED subsystem driver can be controlled also from the level of VideoForLinux2
> +subsystem. In order to enable this CONFIG_V4L2_FLASH_LED_CLASS symbol has to
> +be defined in the kernel config. The driver must call the v4l2_flash_init
> +function to get registered in the V4L2 subsystem. On remove the
> +v4l2_flash_release function has to be called (see <media/v4l2-flash.h>).
> +
> +After proper initialization a V4L2 Flash sub-device is created. The sub-device
> +exposes a number of V4L2 controls, which allow for controlling a LED Flash class
> +device with use of its internal kernel API.
> +Opening the V4L2 Flash sub-device makes the LED subsystem sysfs interface
> +unavailable. The interface is re-enabled after the V4L2 Flash sub-device
> +is closed.
> --
> 1.7.9.5
>
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