linux-kernel - Re: [PATCH/RFC v13 10/13] Documentation: leds: Add description of v4l2-flash sub-device

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Date:	Wed, 18 Mar 2015 14:39:57 +0200
From:	Sakari Ailus <sakari.ailus@....fi>
To:	Jacek Anaszewski <j.anaszewski@...sung.com>
Cc:	linux-leds@...r.kernel.org, linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	kyungmin.park@...sung.com, pavel@....cz, cooloney@...il.com,
	rpurdie@...ys.net, s.nawrocki@...sung.com
Subject: Re: [PATCH/RFC v13 10/13] Documentation: leds: Add description of
 v4l2-flash sub-device

Hi Jacek,

On Thu, Mar 12, 2015 at 04:45:11PM +0100, Jacek Anaszewski 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>
> Acked-by: Sakari Ailus <sakari.ailus@....fi>
> Cc: Bryan Wu <cooloney@...il.com>
> Cc: Richard Purdie <rpurdie@...ys.net>
> ---
>  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 19bb673..8623413 100644
> --- a/Documentation/leds/leds-class-flash.txt
> +++ b/Documentation/leds/leds-class-flash.txt
> @@ -20,3 +20,16 @@ Following sysfs attributes are exposed for controlling flash LED devices:
>  	- max_flash_timeout
>  	- flash_strobe
>  	- flash_fault
> +
> +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

Over 80 characters per line.

With this fixed,

Acked-by: Sakari Ailus <sakari.ailus@...ux.intel.com>

> +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.

-- 
Kind regards,

Sakari Ailus
e-mail: sakari.ailus@....fi	XMPP: sailus@...iisi.org.uk
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