Messages in this thread | | | Date | Wed, 18 Mar 2015 14:39:57 +0200 | From | Sakari Ailus <> | Subject | Re: [PATCH/RFC v13 10/13] Documentation: leds: Add description of v4l2-flash sub-device |
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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@samsung.com> > Acked-by: Kyungmin Park <kyungmin.park@samsung.com> > Acked-by: Sakari Ailus <sakari.ailus@iki.fi> > Cc: Bryan Wu <cooloney@gmail.com> > Cc: Richard Purdie <rpurdie@rpsys.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@linux.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@iki.fi XMPP: sailus@retiisi.org.uk
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