Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752030AbaK1J0H (ORCPT ); Fri, 28 Nov 2014 04:26:07 -0500 Received: from mailout3.samsung.com ([203.254.224.33]:44344 "EHLO mailout3.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751438AbaK1JTU (ORCPT ); Fri, 28 Nov 2014 04:19:20 -0500 X-AuditID: cbfee61b-f79d76d0000024d6-19-54783e16e674 From: Jacek Anaszewski To: linux-leds@vger.kernel.org, linux-media@vger.kernel.org, linux-kernel@vger.kernel.org Cc: kyungmin.park@samsung.com, b.zolnierkie@samsung.com, pavel@ucw.cz, cooloney@gmail.com, rpurdie@rpsys.net, sakari.ailus@iki.fi, s.nawrocki@samsung.com, Jacek Anaszewski Subject: [PATCH/RFC v8 03/14] Documentation: leds: Add description of v4l2-flash sub-device Date: Fri, 28 Nov 2014 10:17:55 +0100 Message-id: <1417166286-27685-4-git-send-email-j.anaszewski@samsung.com> X-Mailer: git-send-email 1.7.9.5 In-reply-to: <1417166286-27685-1-git-send-email-j.anaszewski@samsung.com> References: <1417166286-27685-1-git-send-email-j.anaszewski@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrFLMWRmVeSWpSXmKPExsVy+t9jQV0xu4oQg+97FSw2zljPanF050Qm i96rzxktzja9Ybe4vGsOm8XWN+sYLXo2bGW1uHvqKJvF7l1PWS0Ov2lntTizfyWbA7fHzll3 2T0Of13I4rFn/g9Wj74tqxg9Vqz+zu7xeZNcAFsUl01Kak5mWWqRvl0CV0bXkWPsBZd5KmYe usjewHiRq4uRg0NCwETiaqdCFyMnkCkmceHeerYuRi4OIYHpjBLXLr1khXDamSS6F51kBali EzCU+PniNRNIs4hAtMSlY/UgNcwCpxgl1s1czQhSIywQK/H20UEWEJtFQFVi6boDzCA2r4CH xJ5pNxkhFitIzJlkAxLmFPCUmPt5LQtIWAioZNGrlAmMvAsYGVYxiqYWJBcUJ6XnGukVJ+YW l+al6yXn525iBIfgM+kdjKsaLA4xCnAwKvHw/vxXHiLEmlhWXJl7iFGCg1lJhPfUV6AQb0pi ZVVqUX58UWlOavEhRmkOFiVx3hs3c0OEBNITS1KzU1MLUotgskwcnFINjA5VzJaXA1aJyNfl f5wtybSyMJdpUaGVsr2yW07hoVWb9RxkgnbybZG+mfr04LmEvXe/WHtXRBgmH78jPmltBetF S91pNrd0ektaZqUs3nv8CbM+5/k3fuLuT6NnXXv06fZtdjE5waAc91AniY3lxpl1d9v+HD5z i19++QPNMNfJNvtLHd3FlFiKMxINtZiLihMBxGPl/T0CAAA= Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch extends LED Flash class documention by the description of interactions with v4l2-flash sub-device. Signed-off-by: Jacek Anaszewski Acked-by: Kyungmin Park Cc: Bryan Wu Cc: Richard Purdie --- 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 ). + +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-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/