From patchwork Wed Mar 4 16:14:24 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jacek Anaszewski X-Patchwork-Id: 28518 Received: from mail.tu-berlin.de ([130.149.7.33]) by www.linuxtv.org with esmtp (Exim 4.72) (envelope-from ) id 1YTC3t-0000V4-Fq; Wed, 04 Mar 2015 17:22:17 +0100 X-tubIT-Incoming-IP: 209.132.180.67 Received: from vger.kernel.org ([209.132.180.67]) by mail.tu-berlin.de (exim-4.72/mailfrontend-7) with esmtp id 1YTC3r-0008RG-1q; Wed, 04 Mar 2015 17:22:17 +0100 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933167AbbCDQQR (ORCPT + 1 other); Wed, 4 Mar 2015 11:16:17 -0500 Received: from mailout2.samsung.com ([203.254.224.25]:13690 "EHLO mailout2.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933110AbbCDQQJ (ORCPT ); Wed, 4 Mar 2015 11:16:09 -0500 Received: from epcpsbgm2.samsung.com (epcpsbgm2 [203.254.230.27]) by mailout2.samsung.com (Oracle Communications Messaging Server 7u4-24.01(7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTP id <0NKP002J13UV20B0@mailout2.samsung.com>; Thu, 05 Mar 2015 01:16:07 +0900 (KST) X-AuditID: cbfee61b-f79d76d0000024d6-43-54f72fc717da Received: from epmmp1.local.host ( [203.254.227.16]) by epcpsbgm2.samsung.com (EPCPMTA) with SMTP id 4F.67.09430.7CF27F45; Thu, 05 Mar 2015 01:16:07 +0900 (KST) Received: from AMDC2362.DIGITAL.local ([106.120.53.23]) by mmp1.samsung.com (Oracle Communications Messaging Server 7u4-24.01 (7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTPA id <0NKP0082A3SJHN70@mmp1.samsung.com>; Thu, 05 Mar 2015 01:16:07 +0900 (KST) From: Jacek Anaszewski 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 Subject: [PATCH/RFC v12 03/19] Documentation: leds: Add description of LED Flash class extension Date: Wed, 04 Mar 2015 17:14:24 +0100 Message-id: <1425485680-8417-4-git-send-email-j.anaszewski@samsung.com> X-Mailer: git-send-email 1.7.9.5 In-reply-to: <1425485680-8417-1-git-send-email-j.anaszewski@samsung.com> References: <1425485680-8417-1-git-send-email-j.anaszewski@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrLLMWRmVeSWpSXmKPExsVy+t9jAd3j+t9DDG5OlrE4unMik8X8I+dY LXqvPme0ONv0ht3i8q45bBZb36xjtOjZsJXV4u6po2wWu3c9ZbU4/Kad1eLM/pVsDtweO2fd Zfc4/HUhi8ee+T9YPfq2rGL0WLH6O7vH501yAWxRXDYpqTmZZalF+nYJXBnP73SxFlzlqVi1 6zpTA+Mjri5GTg4JAROJzqW3GCFsMYkL99azdTFycQgJLGKU2HrvDzOE084k8W3NHBaQKjYB Q4mfL14zgdgiAtYSsw5NZwEpYhZ4wygxa8M5sISwQJJE58XTYGNZBFQlZjWcArN5Bdwljqzb xNrFyAG0TkFiziQbkDCngIfE2ZvrwVqFgEoOP9zPMoGRdwEjwypG0dSC5ILipPRcI73ixNzi 0rx0veT83E2M4EB8Jr2DcVWDxSFGAQ5GJR7eA7HfQoRYE8uKK3MPMUpwMCuJ8D5n+x4ixJuS WFmVWpQfX1Sak1p8iFGag0VJnFfJvi1ESCA9sSQ1OzW1ILUIJsvEwSnVwNgXVNXu/GLn+rkm clK779m4q5axfNv8Kv9/xUaTj1PM39+e/eG5naLWd60pHw23R9ZOWSJpdtVaoWurb+qWl4wL FQ3Lvhb5RN9iWJj77EyInvTto9lKZ2I2frOf4MW3m+37s3O10rUhqus/59Urbl7Hb7nAJdhs /fo7b6YezhOPFXu2o9np3WwlluKMREMt5qLiRACrT/0dQAIAAA== Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org X-PMX-Version: 6.0.0.2142326, Antispam-Engine: 2.7.2.2107409, Antispam-Data: 2015.3.4.161524 X-PMX-Spam: Gauge=IIIIIIII, Probability=8%, Report=' MULTIPLE_RCPTS 0.1, HTML_00_01 0.05, HTML_00_10 0.05, BODYTEXTP_SIZE_3000_LESS 0, BODY_SIZE_1700_1799 0, BODY_SIZE_2000_LESS 0, BODY_SIZE_5000_LESS 0, BODY_SIZE_7000_LESS 0, REFERENCES 0, URI_ENDS_IN_HTML 0, __ANY_URI 0, __CP_URI_IN_BODY 0, __FRAUD_BODY_WEBMAIL 0, __FRAUD_WEBMAIL 0, __HAS_FROM 0, __HAS_MSGID 0, __HAS_X_MAILER 0, __HAS_X_MAILING_LIST 0, __IN_REP_TO 0, __MIME_TEXT_ONLY 0, __MULTIPLE_RCPTS_CC_X2 0, __REFERENCES 0, __SANE_MSGID 0, __SUBJ_ALPHA_END 0, __TO_MALFORMED_2 0, __TO_NO_NAME 0, __URI_NO_WWW 0, __URI_NS ' The documentation being added contains overall description of the LED Flash Class and the related sysfs attributes. Signed-off-by: Jacek Anaszewski Acked-by: Kyungmin Park Cc: Bryan Wu Cc: Richard Purdie --- Documentation/leds/leds-class-flash.txt | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) create mode 100644 Documentation/leds/leds-class-flash.txt diff --git a/Documentation/leds/leds-class-flash.txt b/Documentation/leds/leds-class-flash.txt new file mode 100644 index 0000000..19bb673 --- /dev/null +++ b/Documentation/leds/leds-class-flash.txt @@ -0,0 +1,22 @@ + +Flash LED handling under Linux +============================== + +Some LED devices provide two modes - torch and flash. In the LED subsystem +those modes are supported by LED class (see Documentation/leds/leds-class.txt) +and LED Flash class respectively. The torch mode related features are enabled +by default and the flash ones only if a driver declares it by setting +LED_DEV_CAP_FLASH flag. + +In order to enable the support for flash LEDs CONFIG_LEDS_CLASS_FLASH symbol +must be defined in the kernel config. A LED Flash class driver must be +registered in the LED subsystem with led_classdev_flash_register function. + +Following sysfs attributes are exposed for controlling flash LED devices: +(see Documentation/ABI/testing/sysfs-class-led-flash) + - flash_brightness + - max_flash_brightness + - flash_timeout + - max_flash_timeout + - flash_strobe + - flash_fault