This patch extends LED Flash class documention by
the description of interactions with v4l2-flash sub-device.
Signed-off-by: Jacek Anaszewski j.anaszew...@samsung.com
Acked-by: Kyungmin Park kyungmin.p...@samsung.com
Acked-by: Sakari Ailus sakari.ai...@linux.intel.com
Cc: Bryan Wu coolo...@gmail.com
Cc: Richard Purdie rpur...@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 d80096b..2f38627 100644
--- a/Documentation/leds/leds-class-flash.txt
+++ b/Documentation/leds/leds-class-flash.txt
@@ -55,3 +55,16 @@ Following sysfs attributes are exposed for controlling flash
led devices:
upper limit
Flash faults are cleared, if possible, by reading the attribute.
+
+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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