From: Jacek Anaszewski <j.anaszewski@samsung.com>
To: linux-leds@vger.kernel.org, linux-media@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, devicetree@vger.kernel.org,
kyungmin.park@samsung.com, pavel@ucw.cz, cooloney@gmail.com,
rpurdie@rpsys.net, sakari.ailus@iki.fi, s.nawrocki@samsung.com,
Jacek Anaszewski <j.anaszewski@samsung.com>
Subject: [PATCH/RFC v12 16/19] Documentation: leds: Add description of v4l2-flash sub-device
Date: Wed, 04 Mar 2015 17:14:37 +0100 [thread overview]
Message-ID: <1425485680-8417-17-git-send-email-j.anaszewski@samsung.com> (raw)
In-Reply-To: <1425485680-8417-1-git-send-email-j.anaszewski@samsung.com>
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@linux.intel.com>
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
+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
next prev parent reply other threads:[~2015-03-04 16:17 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-04 16:14 [PATCH/RFC v12 00/19] LED / flash API integration Jacek Anaszewski
2015-03-04 16:14 ` [PATCH/RFC v12 01/19] leds: flash: Remove synchronized flash strobe feature Jacek Anaszewski
2015-03-09 23:23 ` Bryan Wu
2015-03-04 16:14 ` [PATCH/RFC v12 02/19] leds: flash: document sysfs interface Jacek Anaszewski
2015-03-10 0:17 ` Bryan Wu
2015-03-04 16:14 ` [PATCH/RFC v12 03/19] Documentation: leds: Add description of LED Flash class extension Jacek Anaszewski
2015-03-10 0:23 ` Bryan Wu
2015-03-04 16:14 ` [PATCH/RFC v12 04/19] dt-binding: leds: Add common LED DT bindings macros Jacek Anaszewski
2015-03-05 7:56 ` Jacek Anaszewski
2015-03-10 0:33 ` Bryan Wu
2015-03-04 16:14 ` [PATCH/RFC v12 05/19] mfd: max77693: Modify flash cell name identifiers Jacek Anaszewski
2015-03-09 9:36 ` Lee Jones
2015-03-04 16:14 ` [PATCH/RFC v12 06/19] mfd: max77693: Remove struct max77693_led_platform_data Jacek Anaszewski
2015-03-09 9:35 ` Lee Jones
2015-03-04 16:14 ` [PATCH/RFC v12 07/19] mfd: max77693: add TORCH_IOUT_MASK macro Jacek Anaszewski
2015-03-09 9:36 ` Lee Jones
2015-03-04 16:14 ` [PATCH/RFC v12 08/19] mfd: max77693: Adjust FLASH_EN_SHIFT and TORCH_EN_SHIFT macros Jacek Anaszewski
2015-03-09 9:35 ` Lee Jones
2015-03-04 16:14 ` [PATCH/RFC v12 09/19] leds: Add support for max77693 mfd flash cell Jacek Anaszewski
2015-03-04 16:14 ` [PATCH/RFC v12 10/19] DT: Add documentation for the mfd Maxim max77693 Jacek Anaszewski
2015-03-09 10:54 ` Sakari Ailus
2015-03-09 12:19 ` Jacek Anaszewski
2015-03-09 12:37 ` Sakari Ailus
2015-03-09 13:45 ` Jacek Anaszewski
2015-03-04 16:14 ` [PATCH/RFC v12 11/19] leds: Add driver for AAT1290 current regulator Jacek Anaszewski
2015-03-04 16:14 ` [PATCH/RFC v12 12/19] of: Add Skyworks Solutions, Inc. vendor prefix Jacek Anaszewski
2015-03-04 16:14 ` [PATCH/RFC v12 13/19] DT: Add documentation for the Skyworks AAT1290 Jacek Anaszewski
2015-03-04 16:14 ` [PATCH/RFC v12 14/19] exynos4-is: Add support for v4l2-flash subdevs Jacek Anaszewski
2015-03-04 16:14 ` [PATCH/RFC v12 15/19] media: Add registration helpers for V4L2 flash sub-devices Jacek Anaszewski
2015-03-04 16:14 ` Jacek Anaszewski [this message]
2015-03-04 16:14 ` [PATCH/RFC v12 17/19] DT: Add documentation for exynos4-is 'flashes' property Jacek Anaszewski
2015-03-04 16:14 ` [PATCH/RFC v12 18/19] leds: max77693: add support for V4L2 Flash sub-device Jacek Anaszewski
2015-03-04 16:14 ` [PATCH/RFC v12 19/19] leds: aat1290: " Jacek Anaszewski
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