From patchwork Mon Jan 17 19:15:18 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Cyril Chemparathy X-Patchwork-Id: 484481 Received: from arroyo.ext.ti.com (arroyo.ext.ti.com [192.94.94.40]) by demeter1.kernel.org (8.14.4/8.14.3) with ESMTP id p0HJLZ0V014135 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK) for ; Mon, 17 Jan 2011 19:21:57 GMT Received: from dlep35.itg.ti.com ([157.170.170.118]) by arroyo.ext.ti.com (8.13.7/8.13.7) with ESMTP id p0HJGqhF013949 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Mon, 17 Jan 2011 13:17:13 -0600 Received: from linux.omap.com (localhost [127.0.0.1]) by dlep35.itg.ti.com (8.13.7/8.13.7) with ESMTP id p0HJGpZS022086; Mon, 17 Jan 2011 13:16:51 -0600 (CST) Received: from linux.omap.com (localhost [127.0.0.1]) by linux.omap.com (Postfix) with ESMTP id 447B780628; Mon, 17 Jan 2011 13:16:40 -0600 (CST) X-Original-To: davinci-linux-open-source@linux.davincidsp.com Delivered-To: davinci-linux-open-source@linux.davincidsp.com Received: from dlep36.itg.ti.com (dlep36.itg.ti.com [157.170.170.91]) by linux.omap.com (Postfix) with ESMTP id 932B580627 for ; Mon, 17 Jan 2011 13:15:30 -0600 (CST) Received: from legion.dal.design.ti.com (localhost [127.0.0.1]) by dlep36.itg.ti.com (8.13.8/8.13.8) with ESMTP id p0HJFUkt010635; Mon, 17 Jan 2011 13:15:30 -0600 (CST) Received: from gtrgwdeb (gtrgwdeb.telogy.design.ti.com [158.218.102.24]) by legion.dal.design.ti.com (8.11.7p1+Sun/8.11.7) with ESMTP id p0HJFTf12588; Mon, 17 Jan 2011 13:15:29 -0600 (CST) Received: by gtrgwdeb (Postfix, from userid 39959) id 6F5E31EE2A7; Mon, 17 Jan 2011 14:15:27 -0500 (EST) From: Cyril Chemparathy To: davinci-linux-open-source@linux.davincidsp.com, spi-devel-general@lists.sourceforge.net, sameo@linux.intel.com, rpurdie@rpsys.net, dbrownell@users.sourceforge.net Subject: [PATCH v8 04/11] backlight: add support for tps6116x controller Date: Mon, 17 Jan 2011 14:15:18 -0500 Message-Id: <1295291725-32509-5-git-send-email-cyril@ti.com> X-Mailer: git-send-email 1.7.1 In-Reply-To: <1295291725-32509-1-git-send-email-cyril@ti.com> References: <1295291725-32509-1-git-send-email-cyril@ti.com> X-BeenThere: davinci-linux-open-source@linux.davincidsp.com X-Mailman-Version: 2.1.12 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: davinci-linux-open-source-bounces@linux.davincidsp.com Errors-To: davinci-linux-open-source-bounces@linux.davincidsp.com X-Greylist: Sender succeeded STARTTLS authentication, not delayed by milter-greylist-4.2.6 (demeter1.kernel.org [140.211.167.41]); Mon, 17 Jan 2011 19:21:57 +0000 (UTC) diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig index e54a337..06e868e 100644 --- a/drivers/video/backlight/Kconfig +++ b/drivers/video/backlight/Kconfig @@ -307,6 +307,13 @@ config BACKLIGHT_PCF50633 If you have a backlight driven by a NXP PCF50633 MFD, say Y here to enable its driver. +config BACKLIGHT_TPS6116X + tristate "TPS6116X LCD Backlight" + depends on GENERIC_GPIO + help + This driver controls the LCD backlight level for EasyScale capable + SSP connected backlight controllers. + endif # BACKLIGHT_CLASS_DEVICE endif # BACKLIGHT_LCD_SUPPORT diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile index 44c0f81..5d407c8 100644 --- a/drivers/video/backlight/Makefile +++ b/drivers/video/backlight/Makefile @@ -35,4 +35,4 @@ obj-$(CONFIG_BACKLIGHT_ADP5520) += adp5520_bl.o obj-$(CONFIG_BACKLIGHT_ADP8860) += adp8860_bl.o obj-$(CONFIG_BACKLIGHT_88PM860X) += 88pm860x_bl.o obj-$(CONFIG_BACKLIGHT_PCF50633) += pcf50633-backlight.o - +obj-$(CONFIG_BACKLIGHT_TPS6116X)+= tps6116x.o diff --git a/drivers/video/backlight/tps6116x.c b/drivers/video/backlight/tps6116x.c new file mode 100644 index 0000000..7f846ab --- /dev/null +++ b/drivers/video/backlight/tps6116x.c @@ -0,0 +1,299 @@ +/* + * TPS6116X LCD Backlight Controller Driver + * + * Copyright (C) 2010 Texas Instruments + * + * 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 version 2. + * + * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind, + * whether express or implied; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#define TPS6116X_MAX_INTENSITY 31 +#define TPS6116X_DEFAULT_INTENSITY 10 + +/* Easyscale timing w/ margin (usecs) */ +#define T_POWER_SETTLE 2000 +#define T_ES_DELAY 120 +#define T_ES_DETECT 280 +#define T_ES_WINDOW (1000 - T_ES_DELAY - T_ES_DETECT) +#define T_START 3 +#define T_EOS 3 +#define T_INACTIVE 3 +#define T_ACTIVE (3 * T_INACTIVE) + +#define CMD_SET 0x72 + +struct tps6116x { + struct ti_ssp_device *handle; + struct device *dev; + int gpio; + struct mutex lock; + int intensity; + struct backlight_properties props; + struct backlight_device *bl; + struct regulator *regulator; + bool power; + bool suspended; +}; + +static int __set_power(struct tps6116x *hw, bool power) +{ + unsigned long flags; + int error; + + if (power == hw->power) + return 0; /* nothing to do */ + + /* disabling is simple... choke power */ + if (!power) { + error = regulator_disable(hw->regulator); + goto done; + } + + /* set ctrl pin init state for easyscale detection */ + gpio_set_value(hw->gpio, 0); + + error = regulator_enable(hw->regulator); + if (error < 0) + goto done; + + udelay(T_POWER_SETTLE); + + /* + * Now that the controller is powered up, we need to put it into 1-wire + * mode. This is a timing sensitive operation, hence the irq disable. + * Ideally, this should happen rarely, and mostly at init, so disabling + * interrupts for the duration should not be a problem. + */ + local_irq_save(flags); + + gpio_set_value(hw->gpio, 1); + udelay(T_ES_DELAY); + gpio_set_value(hw->gpio, 0); + udelay(T_ES_DETECT); + gpio_set_value(hw->gpio, 1); + + local_irq_restore(flags); + +done: + if (error >= 0) + hw->power = power; + + return error; +} + +static void __write_byte(struct tps6116x *hw, u8 data) +{ + int bit; + + gpio_set_value(hw->gpio, 1); + udelay(T_START); + + for (bit = 0; bit < 8; bit++, data <<= 1) { + int val = data & 0x80; + int t_lo = val ? T_INACTIVE : T_ACTIVE; + int t_hi = val ? T_ACTIVE : T_INACTIVE; + + gpio_set_value(hw->gpio, 0); + udelay(t_lo); + gpio_set_value(hw->gpio, 1); + udelay(t_hi); + } + + gpio_set_value(hw->gpio, 0); + udelay(T_EOS); + gpio_set_value(hw->gpio, 1); +} + +static void __set_intensity(struct tps6116x *hw, int intensity) +{ + unsigned long flags; + + intensity = clamp(intensity, 0, TPS6116X_MAX_INTENSITY); + + local_irq_save(flags); + __write_byte(hw, CMD_SET); + __write_byte(hw, intensity); + local_irq_restore(flags); +} + +static int set_intensity(struct tps6116x *hw, int intensity) +{ + int error = 0; + + if (intensity == hw->intensity) + return 0; + + mutex_lock(&hw->lock); + + error = __set_power(hw, intensity ? true : false); + if (error < 0) + goto error; + + if (intensity > 0) + __set_intensity(hw, intensity); + + hw->intensity = intensity; +error: + mutex_unlock(&hw->lock); + + return error; +} + +static int get_brightness(struct backlight_device *bl) +{ + struct tps6116x *hw = bl_get_data(bl); + + return hw->intensity; +} + +static int update_status(struct backlight_device *bl) +{ + struct tps6116x *hw = bl_get_data(bl); + int intensity = bl->props.brightness; + + if (hw->suspended || hw->props.state & BL_CORE_SUSPENDED) + intensity = 0; + if (bl->props.power != FB_BLANK_UNBLANK) + intensity = 0; + if (bl->props.fb_blank != FB_BLANK_UNBLANK) + intensity = 0; + + return set_intensity(hw, intensity); +} + +static const struct backlight_ops tps6116x_backlight_ops = { + .options = BL_CORE_SUSPENDRESUME, + .get_brightness = get_brightness, + .update_status = update_status, +}; + +static int __devinit tps6116x_probe(struct platform_device *pdev) +{ + struct tps6116x *hw; + struct device *dev = &pdev->dev; + struct backlight_properties props; + int error; + + hw = kzalloc(sizeof(struct tps6116x), GFP_KERNEL); + if (!hw) { + dev_err(dev, "cannot allocate driver data\n"); + return -ENOMEM; + } + platform_set_drvdata(pdev, hw); + + hw->gpio = (int)dev->platform_data; + hw->dev = dev; + + mutex_init(&hw->lock); + + hw->regulator = regulator_get(dev, "vlcd"); + if (IS_ERR(hw->regulator)) { + error = PTR_ERR(hw->regulator); + dev_err(dev, "cannot claim regulator\n"); + goto error_regulator; + } + + error = gpio_request_one(hw->gpio, GPIOF_DIR_OUT, dev_name(dev)); + if (error < 0) { + dev_err(dev, "cannot claim gpio\n"); + goto error_gpio; + } + + memset(&props, 0, sizeof(props)); + props.max_brightness = TPS6116X_MAX_INTENSITY; + props.brightness = TPS6116X_DEFAULT_INTENSITY; + props.power = FB_BLANK_UNBLANK; + + hw->bl = backlight_device_register("tps6116x", hw->dev, hw, + &tps6116x_backlight_ops, &props); + if (IS_ERR(hw->bl)) { + error = PTR_ERR(hw->bl); + dev_err(dev, "backlight registration failed\n"); + goto error_register; + } + + update_status(hw->bl); + dev_info(dev, "registered backlight controller\n"); + return 0; + +error_register: + gpio_free(hw->gpio); +error_gpio: + regulator_put(hw->regulator); +error_regulator: + kfree(hw); + platform_set_drvdata(pdev, NULL); + return error; +} + +static int __devexit tps6116x_remove(struct platform_device *pdev) +{ + struct tps6116x *hw = platform_get_drvdata(pdev); + + backlight_device_unregister(hw->bl); + regulator_disable(hw->regulator); + regulator_put(hw->regulator); + gpio_free(hw->gpio); + kfree(hw); + platform_set_drvdata(pdev, NULL); + return 0; +} + +static int tps6116x_suspend(struct platform_device *pdev, pm_message_t state) +{ + struct tps6116x *hw = platform_get_drvdata(pdev); + hw->suspended = true; + update_status(hw->bl); + return 0; +} + +static int tps6116x_resume(struct platform_device *pdev) +{ + struct tps6116x *hw = platform_get_drvdata(pdev); + hw->suspended = false; + update_status(hw->bl); + return 0; +} + +static struct platform_driver tps6116x_driver = { + .probe = tps6116x_probe, + .remove = __devexit_p(tps6116x_remove), + .suspend = tps6116x_suspend, + .resume = tps6116x_resume, + .driver = { + .name = "tps6116x", + .owner = THIS_MODULE, + }, +}; + +static int __init tps6116x_init(void) +{ + return platform_driver_register(&tps6116x_driver); +} +module_init(tps6116x_init); + +static void __exit tps6116x_exit(void) +{ + platform_driver_unregister(&tps6116x_driver); +} +module_exit(tps6116x_exit); + +MODULE_DESCRIPTION("SSP TPS6116X Driver"); +MODULE_AUTHOR("Cyril Chemparathy"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:tps6116x");