| Message ID | 1417166286-27685-4-git-send-email-j.anaszewski@samsung.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Fri, Nov 28, 2014 at 10:17:55AM +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> > Cc: Bryan Wu <cooloney@gmail.com> > Cc: Richard Purdie <rpurdie@rpsys.net> Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
On Fri, Nov 28, 2014 at 1:17 AM, Jacek Anaszewski <j.anaszewski@samsung.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@samsung.com> > Acked-by: Kyungmin Park <kyungmin.park@samsung.com> > Cc: Bryan Wu <cooloney@gmail.com> > Cc: Richard Purdie <rpurdie@rpsys.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 > -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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.