From patchwork Mon Sep 23 21:40:58 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thierry Reding X-Patchwork-Id: 2930581 Return-Path: X-Original-To: patchwork-linux-samsung-soc@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 9DF3D9F2B8 for ; Mon, 23 Sep 2013 21:46:42 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id B3A5C2012D for ; Mon, 23 Sep 2013 21:46:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C8A632010A for ; Mon, 23 Sep 2013 21:46:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754666Ab3IWVq1 (ORCPT ); Mon, 23 Sep 2013 17:46:27 -0400 Received: from mail-bk0-f49.google.com ([209.85.214.49]:53444 "EHLO mail-bk0-f49.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753342Ab3IWVme (ORCPT ); Mon, 23 Sep 2013 17:42:34 -0400 Received: by mail-bk0-f49.google.com with SMTP id r7so1394409bkg.8 for ; Mon, 23 Sep 2013 14:42:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=BGXHOnESf0lJIZiKZPd9y4f8JUy0Z8nJy13qgrLUoiM=; b=FvmB9PWK3MRJyQZbDTPrmJE0TDO6Rgx/0QcRWsVCVMYF16wvFuBmLJWYoAukzZn2Mg 9mmoZgQzrJC+7RmpwBpV0hCdyb7DIhWcY1gsOAU5MmiJqKWZXAMYwgKO/AOBKHUf3MAq pytHHmBIV0B4qGDszlgaNCG1NoR+uIFruFhMDbFwWZO1wxpCBU7cVe0g+GZCrZG3khnz B9m1x4qL9sVZU/Ql2RNlmNp7/1MJbxwQRsp0cyQRAvWK5bXQeEhPH4SMXr6+TTlWj1ck OpmszuKIrWwgq+UqnQOnR0UFwI+Z9ucSgBJHJbVu3tNSEDks5xWtdDYH6RkLtZiowKWh 6WEw== X-Received: by 10.204.121.201 with SMTP id i9mr20066831bkr.13.1379972551823; Mon, 23 Sep 2013 14:42:31 -0700 (PDT) Received: from localhost (port-13639.pppoe.wtnet.de. [84.46.53.124]) by mx.google.com with ESMTPSA id pk7sm9651548bkb.2.1969.12.31.16.00.00 (version=TLSv1.2 cipher=RC4-SHA bits=128/128); Mon, 23 Sep 2013 14:42:31 -0700 (PDT) From: Thierry Reding To: Thierry Reding Cc: Rob Herring , Pawel Moll , Mark Rutland , Stephen Warren , Ian Campbell , Tony Lindgren , Eric Miao , Haojian Zhuang , Ben Dooks , Kukjin Kim , Simon Horman , Magnus Damm , Guan Xuetao , devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-omap@vger.kernel.org, openezx-devel@lists.openezx.org, linux-samsung-soc@vger.kernel.org, linux-sh@vger.kernel.org, linux-pwm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 01/10] pwm-backlight: Refactor backlight power on/off Date: Mon, 23 Sep 2013 23:40:58 +0200 Message-Id: <1379972467-11243-2-git-send-email-treding@nvidia.com> X-Mailer: git-send-email 1.8.4 In-Reply-To: <1379972467-11243-1-git-send-email-treding@nvidia.com> References: <1379972467-11243-1-git-send-email-treding@nvidia.com> Sender: linux-samsung-soc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-samsung-soc@vger.kernel.org X-Spam-Status: No, score=-5.7 required=5.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED, DKIM_SIGNED, FREEMAIL_FROM, KHOP_BIG_TO_CC, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, T_DKIM_INVALID, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP In preparation for adding an optional regulator and enable GPIO to the driver, split the power on and power off sequences into separate functions to reduce code duplication at the multiple call sites. Signed-off-by: Thierry Reding --- drivers/video/backlight/pwm_bl.c | 59 ++++++++++++++++++++++++---------------- 1 file changed, 36 insertions(+), 23 deletions(-) diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c index 36db5d9..8a49b30 100644 --- a/drivers/video/backlight/pwm_bl.c +++ b/drivers/video/backlight/pwm_bl.c @@ -35,6 +35,30 @@ struct pwm_bl_data { void (*exit)(struct device *); }; +static void pwm_backlight_power_on(struct pwm_bl_data *pb, int brightness, + int max) +{ + int duty_cycle, err; + + if (pb->levels) { + duty_cycle = pb->levels[brightness]; + max = pb->levels[max]; + } else { + duty_cycle = brightness; + } + + duty_cycle = (duty_cycle * (pb->period - pb->lth_brightness) / max) + + pb->lth_brightness; + + pwm_config(pb->pwm, duty_cycle, pb->period); + pwm_enable(pb->pwm); +} + +static void pwm_backlight_power_off(struct pwm_bl_data *pb) +{ + pwm_disable(pb->pwm); +} + static int pwm_backlight_update_status(struct backlight_device *bl) { struct pwm_bl_data *pb = bl_get_data(bl); @@ -49,24 +73,10 @@ static int pwm_backlight_update_status(struct backlight_device *bl) if (pb->notify) brightness = pb->notify(pb->dev, brightness); - if (brightness == 0) { - pwm_config(pb->pwm, 0, pb->period); - pwm_disable(pb->pwm); - } else { - int duty_cycle; - - if (pb->levels) { - duty_cycle = pb->levels[brightness]; - max = pb->levels[max]; - } else { - duty_cycle = brightness; - } - - duty_cycle = pb->lth_brightness + - (duty_cycle * (pb->period - pb->lth_brightness) / max); - pwm_config(pb->pwm, duty_cycle, pb->period); - pwm_enable(pb->pwm); - } + if (brightness > 0) + pwm_backlight_power_on(pb, brightness, max); + else + pwm_backlight_power_off(pb); if (pb->notify_after) pb->notify_after(pb->dev, brightness); @@ -267,10 +277,11 @@ static int pwm_backlight_remove(struct platform_device *pdev) struct pwm_bl_data *pb = bl_get_data(bl); backlight_device_unregister(bl); - pwm_config(pb->pwm, 0, pb->period); - pwm_disable(pb->pwm); + pwm_backlight_power_off(pb); + if (pb->exit) pb->exit(&pdev->dev); + return 0; } @@ -282,10 +293,12 @@ static int pwm_backlight_suspend(struct device *dev) if (pb->notify) pb->notify(pb->dev, 0); - pwm_config(pb->pwm, 0, pb->period); - pwm_disable(pb->pwm); + + pwm_backlight_power_off(pb); + if (pb->notify_after) pb->notify_after(pb->dev, 0); + return 0; } @@ -294,6 +307,7 @@ static int pwm_backlight_resume(struct device *dev) struct backlight_device *bl = dev_get_drvdata(dev); backlight_update_status(bl); + return 0; } #endif @@ -317,4 +331,3 @@ module_platform_driver(pwm_backlight_driver); MODULE_DESCRIPTION("PWM based Backlight Driver"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:pwm-backlight"); -