From patchwork Mon Jul 15 14:56:58 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Denis Carikli X-Patchwork-Id: 2827585 Return-Path: X-Original-To: patchwork-linux-arm@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 C69C69F9A0 for ; Mon, 15 Jul 2013 15:20:32 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id C6286201ED for ; Mon, 15 Jul 2013 15:20:27 +0000 (UTC) Received: from casper.infradead.org (casper.infradead.org [85.118.1.10]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 9D44D201C7 for ; Mon, 15 Jul 2013 15:20:23 +0000 (UTC) Received: from merlin.infradead.org ([205.233.59.134]) by casper.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1UykQ5-0004JW-RT; Mon, 15 Jul 2013 15:10:35 +0000 Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1UykPY-0007Rk-7L; Mon, 15 Jul 2013 15:10:00 +0000 Received: from 19.mo1.mail-out.ovh.net ([178.32.97.206] helo=mo1.mail-out.ovh.net) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1UykEJ-0006rU-VO for linux-arm-kernel@lists.infradead.org; Mon, 15 Jul 2013 14:58:30 +0000 Received: from mail635.ha.ovh.net (gw6.ovh.net [213.251.189.206]) by mo1.mail-out.ovh.net (Postfix) with SMTP id C3333FF9351 for ; Mon, 15 Jul 2013 16:57:57 +0200 (CEST) Received: from b0.ovh.net (HELO queueout) (213.186.33.50) by b0.ovh.net with SMTP; 15 Jul 2013 17:01:53 +0200 Received: from pac33-3-88-170-243-169.fbx.proxad.net (HELO denis-N73SV.local.eukrea.com) (denis%eukrea.com@88.170.243.169) by ns0.ovh.net with SMTP; 15 Jul 2013 17:01:51 +0200 From: Denis Carikli To: linux-arm-kernel@lists.infradead.org X-Ovh-Mailout: 178.32.228.1 (mo1.mail-out.ovh.net) Subject: =?UTF-8?q?=5BPATCH=2013/22=5D=20lcd=3A=20Add=20GPIO=20LCD=20driver=2E?= Date: Mon, 15 Jul 2013 16:56:58 +0200 Message-Id: <1373900227-341-14-git-send-email-denis@eukrea.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1373900227-341-1-git-send-email-denis@eukrea.com> References: <1373900227-341-1-git-send-email-denis@eukrea.com> MIME-Version: 1.0 X-Ovh-Tracer-Id: 1071575237563719178 X-Ovh-Remote: 88.170.243.169 (pac33-3-88-170-243-169.fbx.proxad.net) X-Ovh-Local: 213.186.33.20 (ns0.ovh.net) X-OVH-SPAMSTATE: OK X-OVH-SPAMSCORE: -100 X-OVH-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrfeeijedrvddtucetufdoteggodetrfcurfhrohhfihhlvgemucfqggfjnecuuegrihhlohhuthemuceftddtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmd X-Spam-Check: DONE|U 0.5/N X-VR-SPAMSTATE: OK X-VR-SPAMSCORE: -100 X-VR-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrfeeijedrvddtucetufdoteggodetrfcurfhrohhfihhlvgemucfqggfjnecuuegrihhlohhuthemuceftddtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmd X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20130715_105824_429996_871CA569 X-CRM114-Status: GOOD ( 24.92 ) X-Spam-Score: -1.9 (-) Cc: Denis Carikli , =?UTF-8?q?Eric=20B=C3=A9nard?= X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.6 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, 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 Signed-off-by: Denis Carikli --- .../bindings/video/backlight/gpio-lcd.txt | 15 ++ drivers/video/backlight/Kconfig | 8 + drivers/video/backlight/Makefile | 1 + drivers/video/backlight/gpio_lcd.c | 178 ++++++++++++++++++++ 4 files changed, 202 insertions(+) create mode 100644 Documentation/devicetree/bindings/video/backlight/gpio-lcd.txt create mode 100644 drivers/video/backlight/gpio_lcd.c diff --git a/Documentation/devicetree/bindings/video/backlight/gpio-lcd.txt b/Documentation/devicetree/bindings/video/backlight/gpio-lcd.txt new file mode 100644 index 0000000..4ff409d --- /dev/null +++ b/Documentation/devicetree/bindings/video/backlight/gpio-lcd.txt @@ -0,0 +1,15 @@ +gpio-lcd bindings + +Required properties: + - compatible: "gpio-lcd" + - gpios: describes the gpio that is used for enabling/disabling the lcd + (see GPIO binding[0] for more details). + +[0]: Documentation/devicetree/bindings/gpio/gpio.txt + +Example: + + lcd { + compatible = "gpio-lcd"; + gpios = <&gpio3 13 0>; + }; diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig index 70e7706..eaf0525 100644 --- a/drivers/video/backlight/Kconfig +++ b/drivers/video/backlight/Kconfig @@ -34,6 +34,14 @@ config LCD_CORGI Say y here to support the LCD panels usually found on SHARP corgi (C7x0) and spitz (Cxx00) models. +config LCD_GPIO + tristate "LCD GPIO Driver" + depends on OF && GPIOLIB + help + If your LCD enbling/disabling is controlled by a GPIO + and that you use the device tree for booting, + say y to enable the LCD GPIO driver. + config LCD_L4F00242T03 tristate "Epson L4F00242T03 LCD" depends on SPI_MASTER && GPIOLIB diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile index 8cde337..5c25955 100644 --- a/drivers/video/backlight/Makefile +++ b/drivers/video/backlight/Makefile @@ -3,6 +3,7 @@ obj-$(CONFIG_LCD_AMS369FG06) += ams369fg06.o obj-$(CONFIG_LCD_CLASS_DEVICE) += lcd.o obj-$(CONFIG_LCD_CORGI) += corgi_lcd.o +obj-$(CONFIG_LCD_GPIO) += gpio_lcd.o obj-$(CONFIG_LCD_HP700) += jornada720_lcd.o obj-$(CONFIG_LCD_HX8357) += hx8357.o obj-$(CONFIG_LCD_ILI922X) += ili922x.o diff --git a/drivers/video/backlight/gpio_lcd.c b/drivers/video/backlight/gpio_lcd.c new file mode 100644 index 0000000..e1c9d4a --- /dev/null +++ b/drivers/video/backlight/gpio_lcd.c @@ -0,0 +1,178 @@ +/* + * drivers/video/backlight/gpio_lcd.c + * + * simple GPIO based lcd control. + * + * Copyright 2013 Eukréa Electromatique + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Based on drivers/video/backlight/platform_lcd.c + */ + +#include +#include +#include +#include +#include + +struct gpio_lcd { + unsigned gpio; + u32 active_low; /* 1 if active_low, 0 otherwise */ + struct lcd_device *lcd; + unsigned int power; + unsigned int suspended; +}; + +static int gpio_lcd_get_power(struct lcd_device *lcd) +{ + struct gpio_lcd *glcd = lcd_get_data(lcd); + + return glcd->power; +} + +static int gpio_lcd_set_power(struct lcd_device *lcd, int power) +{ + struct gpio_lcd *glcd = lcd_get_data(lcd); + int lcd_power = 1; + unsigned ret = 0; + + if (power == FB_BLANK_POWERDOWN || glcd->suspended) + lcd_power = 0; + + ret = gpio_direction_output(glcd->gpio, + lcd_power ? !glcd->active_low : glcd->active_low); + + glcd->power = power; + + return ret; +} + +static struct lcd_ops gpio_lcd_ops = { + .get_power = gpio_lcd_get_power, + .set_power = gpio_lcd_set_power, +}; + +static int gpio_lcd_probe(struct platform_device *pdev) +{ + struct gpio_lcd *glcd; + struct device *dev = &pdev->dev; + struct device_node *np = pdev->dev.of_node; + enum of_gpio_flags gpio_flags; + int ret = 0; + + dev_info(&pdev->dev, "Initializing.\n"); + + glcd = devm_kzalloc(&pdev->dev, sizeof(*glcd), GFP_KERNEL); + if (!glcd) { + dev_err(&pdev->dev, "No memory for gpio_lcd.\n"); + return -ENOMEM; + }; + + glcd->gpio = of_get_gpio_flags(np, 0, &gpio_flags); + glcd->active_low = gpio_flags & OF_GPIO_ACTIVE_LOW; + if (glcd->gpio == -EPROBE_DEFER) { + ret = ERR_PTR(-EPROBE_DEFER); + goto err_free_pdata; + } else if (glcd->gpio < 0) { + ret = glcd->gpio; + dev_err(&pdev->dev, "Error: gpios is a required parameter.\n"); + goto err_free_pdata; + } + + /* Request the LCD gpio */ + ret = gpio_request(glcd->gpio, "LCDRST"); + if (ret < 0) { + dev_err(&pdev->dev, "Failled to request LCD reset" + " GPIO %u.\n", glcd->gpio); + goto err_free_pdata; + } + + glcd->lcd = lcd_device_register(dev_name(dev), dev, + glcd, &gpio_lcd_ops); + if (IS_ERR(glcd->lcd)) { + dev_err(dev, "Cannot register lcd device.\n"); + ret = PTR_ERR(glcd->lcd); + goto err_free_pdata; + } + + platform_set_drvdata(pdev, glcd); + gpio_lcd_set_power(glcd->lcd, FB_BLANK_NORMAL); + + dev_info(&pdev->dev, "The LCD was Enabled by the GPIO %u which is %s.\n", + glcd->gpio, + glcd->active_low ? "active low" : "active high"); + + dev_info(&pdev->dev, "Initialized.\n"); + + return 0; + +err_free_pdata: + devm_kfree(&pdev->dev, glcd); + return ret; +} + +static int gpio_lcd_remove(struct platform_device *pdev) +{ + struct gpio_lcd *glcd = platform_get_drvdata(pdev); + + lcd_device_unregister(glcd->lcd); + + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int gpio_lcd_suspend(struct device *dev) +{ + struct gpio_lcd *glcd = dev_get_drvdata(dev); + + glcd->suspended = 1; + return gpio_lcd_set_power(glcd->lcd, glcd->power); +} + +static int gpio_lcd_resume(struct device *dev) +{ + struct gpio_lcd *glcd = dev_get_drvdata(dev); + + glcd->suspended = 0; + return gpio_lcd_set_power(glcd->lcd, glcd->power); +} +#endif + +static SIMPLE_DEV_PM_OPS(gpio_lcd_pm_ops, gpio_lcd_suspend, + gpio_lcd_resume); + +static struct of_device_id gpio_lcd_of_match[] = { + { .compatible = "gpio-lcd" }, + { /* sentinel */ } +}; + +MODULE_DEVICE_TABLE(of, gpio_lcd_of_match); + +static struct platform_driver gpio_lcd_driver = { + .driver = { + .name = "gpio-lcd", + .owner = THIS_MODULE, + .pm = &gpio_lcd_pm_ops, + .of_match_table = of_match_ptr(gpio_lcd_of_match), + }, + .probe = gpio_lcd_probe, + .remove = gpio_lcd_remove, +}; + +module_platform_driver(gpio_lcd_driver); + +MODULE_DESCRIPTION("GPIO based LCD Driver"); +MODULE_LICENSE("GPLv2"); +MODULE_ALIAS("platform:gpio-lcd");