Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753185AbaLCQIy (ORCPT ); Wed, 3 Dec 2014 11:08:54 -0500 Received: from mailout1.samsung.com ([203.254.224.24]:26324 "EHLO mailout1.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751860AbaLCQIu (ORCPT ); Wed, 3 Dec 2014 11:08:50 -0500 X-AuditID: cbfee61b-f79d76d0000024d6-a2-547f35901a76 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, robh+dt@kernel.org, pawel.moll@arm.com, mark.rutland@arm.com, ijc+devicetree@hellion.org.uk, galak@codeaurora.org, Jacek Anaszewski Subject: [PATCH/RFC v9 15/19] Documentation: leds: Add description of v4l2-flash sub-device Date: Wed, 03 Dec 2014 17:06:50 +0100 Message-id: <1417622814-10845-16-git-send-email-j.anaszewski@samsung.com> X-Mailer: git-send-email 1.7.9.5 In-reply-to: <1417622814-10845-1-git-send-email-j.anaszewski@samsung.com> References: <1417622814-10845-1-git-send-email-j.anaszewski@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrOLMWRmVeSWpSXmKPExsVy+t9jQd0JpvUhBrvPylhsnLGe1eLozolM Fv1vFrJanHu1ktGi9+pzRouzTW/YLS7vmsNmsfXNOkaLng1bWS2WXr/IZHH31FE2iwnT17JY tO49wm6xe9dTVovDb9pZLc7sX8nmIOCxZt4aRo/Lfb1MHjtn3WX3WLn8C5vH4a8LWTw2repk 89gz/werR9+WVYweK1Z/Z/f4vEkugCuKyyYlNSezLLVI3y6BK+Pf881MBbd5KtqmTWRsYHzE 1cXIySEhYCLx/dpVVghbTOLCvfVsXYxcHEIC0xklpu+ZxwrhtDNJXD/8gAWkik3AUOLni9dM XYwcHCIC0RKXjtWDhJkFDjJJ3HpcDmILC8RKzP94lgnEZhFQlfj35yEbiM0r4Cnxdu4ldpBW CQEFiTmTbEDCnEDhpz/ug4WFBDwkDk70n8DIu4CRYRWjaGpBckFxUnqukV5xYm5xaV66XnJ+ 7iZGcHA/k97BuKrB4hCjAAejEg+vRVxdiBBrYllxZe4hRgkOZiUR3mffgEK8KYmVValF+fFF pTmpxYcYpTlYlMR5b9zMDRESSE8sSc1OTS1ILYLJMnFwSjUwpq010zqyxndjvNSGx14/V7Uv l7KSMYt7VcN+KkwmusOFfW9IzfIf3lMPfTd5cybvu8Ytx7b2joNt03fcnWfsvVv/7YRzcx/q RdkXrjC4weyW6dx1cVVQ1ImcvpiDUTd5sieXpSzp6j6p+GNpHG/+iq0MnLd6TJ+s1FWc6vfj uVDn1CXcNxOFlViKMxINtZiLihMBlJY6B2oCAAA= 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 Acked-by: Sakari Ailus 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 82e58b1..bc3855b 100644 --- a/Documentation/leds/leds-class-flash.txt +++ b/Documentation/leds/leds-class-flash.txt @@ -48,3 +48,16 @@ Following sysfs attributes are exposed for controlling flash led devices: upper limit Flash faults are cleared 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 ). + +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/