ARM: SAMSUNG: make local dev-backlight in mach-s3c64xx

This patch moves dev-backlight from plat-samsung into mach-s3c64xx
because it is used for only s3c64xx no other platforms.

Cc: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Kukjin Kim <kgene@kernel.org>

3 files changed, 159 insertions, 0 deletions

diff --git a/arch/arm/mach-s3c64xx/Kconfig b/arch/arm/mach-s3c64xx/Kconfig
index eff95e950d81..28c7097e8506 100644
--- a/arch/arm/mach-s3c64xx/Kconfig
+++ b/arch/arm/mach-s3c64xx/Kconfig
@@ -34,6 +34,12 @@ config S3C64XX_DEV_ONENAND1
 	help
 	  Compile in platform device definition for OneNAND1 controller
 
+config SAMSUNG_DEV_BACKLIGHT
+	bool
+	depends on SAMSUNG_DEV_PWM
+	help
+	  Compile in platform device definition LCD backlight with PWM Timer
+
 # platform specific device setup
 
 config S3C64XX_SETUP_I2C0
diff --git a/arch/arm/mach-s3c64xx/Makefile b/arch/arm/mach-s3c64xx/Makefile
index 17f4b07ec763..bb233f342f31 100644
--- a/arch/arm/mach-s3c64xx/Makefile
+++ b/arch/arm/mach-s3c64xx/Makefile
@@ -40,6 +40,8 @@ obj-$(CONFIG_S3C64XX_SETUP_SDHCI_GPIO)	+= setup-sdhci-gpio.o
 obj-$(CONFIG_S3C64XX_SETUP_SPI)		+= setup-spi.o
 obj-$(CONFIG_S3C64XX_SETUP_USB_PHY) += setup-usb-phy.o
 
+obj-$(CONFIG_SAMSUNG_DEV_BACKLIGHT)	+= dev-backlight.o
+
 # Machine support
 
 obj-$(CONFIG_MACH_ANW6410)		+= mach-anw6410.o
diff --git a/arch/arm/mach-s3c64xx/dev-backlight.c b/arch/arm/mach-s3c64xx/dev-backlight.c
new file mode 100644
index 000000000000..62f4648830b5
--- /dev/null
+++ b/arch/arm/mach-s3c64xx/dev-backlight.c
@@ -0,0 +1,151 @@
+/*
+ * Copyright (c) 2011 Samsung Electronics Co., Ltd.
+ *              http://www.samsung.com
+ *
+ * Common infrastructure for PWM Backlight for Samsung boards
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/gpio.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/io.h>
+#include <linux/pwm_backlight.h>
+
+#include <plat/devs.h>
+#include <plat/gpio-cfg.h>
+#include <plat/backlight.h>
+
+struct samsung_bl_drvdata {
+	struct platform_pwm_backlight_data plat_data;
+	struct samsung_bl_gpio_info *gpio_info;
+};
+
+static int samsung_bl_init(struct device *dev)
+{
+	int ret = 0;
+	struct platform_pwm_backlight_data *pdata = dev->platform_data;
+	struct samsung_bl_drvdata *drvdata = container_of(pdata,
+					struct samsung_bl_drvdata, plat_data);
+	struct samsung_bl_gpio_info *bl_gpio_info = drvdata->gpio_info;
+
+	ret = gpio_request(bl_gpio_info->no, "Backlight");
+	if (ret) {
+		printk(KERN_ERR "failed to request GPIO for LCD Backlight\n");
+		return ret;
+	}
+
+	/* Configure GPIO pin with specific GPIO function for PWM timer */
+	s3c_gpio_cfgpin(bl_gpio_info->no, bl_gpio_info->func);
+
+	return 0;
+}
+
+static void samsung_bl_exit(struct device *dev)
+{
+	struct platform_pwm_backlight_data *pdata = dev->platform_data;
+	struct samsung_bl_drvdata *drvdata = container_of(pdata,
+					struct samsung_bl_drvdata, plat_data);
+	struct samsung_bl_gpio_info *bl_gpio_info = drvdata->gpio_info;
+
+	s3c_gpio_cfgpin(bl_gpio_info->no, S3C_GPIO_OUTPUT);
+	gpio_free(bl_gpio_info->no);
+}
+
+/* Initialize few important fields of platform_pwm_backlight_data
+ * structure with default values. These fields can be overridden by
+ * board-specific values sent from machine file.
+ * For ease of operation, these fields are initialized with values
+ * used by most samsung boards.
+ * Users has the option of sending info about other parameters
+ * for their specific boards
+ */
+
+static struct samsung_bl_drvdata samsung_dfl_bl_data __initdata = {
+	.plat_data = {
+		.max_brightness = 255,
+		.dft_brightness = 255,
+		.pwm_period_ns  = 78770,
+		.enable_gpio    = -1,
+		.init           = samsung_bl_init,
+		.exit           = samsung_bl_exit,
+	},
+};
+
+static struct platform_device samsung_dfl_bl_device __initdata = {
+	.name		= "pwm-backlight",
+};
+
+/* samsung_bl_set - Set board specific data (if any) provided by user for
+ * PWM Backlight control and register specific PWM and backlight device.
+ * @gpio_info:	structure containing GPIO info for PWM timer
+ * @bl_data:	structure containing Backlight control data
+ */
+void __init samsung_bl_set(struct samsung_bl_gpio_info *gpio_info,
+	struct platform_pwm_backlight_data *bl_data)
+{
+	int ret = 0;
+	struct platform_device *samsung_bl_device;
+	struct samsung_bl_drvdata *samsung_bl_drvdata;
+	struct platform_pwm_backlight_data *samsung_bl_data;
+
+	samsung_bl_device = kmemdup(&samsung_dfl_bl_device,
+			sizeof(struct platform_device), GFP_KERNEL);
+	if (!samsung_bl_device) {
+		printk(KERN_ERR "%s: no memory for platform dev\n", __func__);
+		return;
+	}
+
+	samsung_bl_drvdata = kmemdup(&samsung_dfl_bl_data,
+				sizeof(samsung_dfl_bl_data), GFP_KERNEL);
+	if (!samsung_bl_drvdata) {
+		printk(KERN_ERR "%s: no memory for platform dev\n", __func__);
+		goto err_data;
+	}
+	samsung_bl_device->dev.platform_data = &samsung_bl_drvdata->plat_data;
+	samsung_bl_drvdata->gpio_info = gpio_info;
+	samsung_bl_data = &samsung_bl_drvdata->plat_data;
+
+	/* Copy board specific data provided by user */
+	samsung_bl_data->pwm_id = bl_data->pwm_id;
+	samsung_bl_device->dev.parent = &samsung_device_pwm.dev;
+
+	if (bl_data->max_brightness)
+		samsung_bl_data->max_brightness = bl_data->max_brightness;
+	if (bl_data->dft_brightness)
+		samsung_bl_data->dft_brightness = bl_data->dft_brightness;
+	if (bl_data->lth_brightness)
+		samsung_bl_data->lth_brightness = bl_data->lth_brightness;
+	if (bl_data->pwm_period_ns)
+		samsung_bl_data->pwm_period_ns = bl_data->pwm_period_ns;
+	if (bl_data->enable_gpio >= 0)
+		samsung_bl_data->enable_gpio = bl_data->enable_gpio;
+	if (bl_data->init)
+		samsung_bl_data->init = bl_data->init;
+	if (bl_data->notify)
+		samsung_bl_data->notify = bl_data->notify;
+	if (bl_data->notify_after)
+		samsung_bl_data->notify_after = bl_data->notify_after;
+	if (bl_data->exit)
+		samsung_bl_data->exit = bl_data->exit;
+	if (bl_data->check_fb)
+		samsung_bl_data->check_fb = bl_data->check_fb;
+
+	/* Register the Backlight dev */
+	ret = platform_device_register(samsung_bl_device);
+	if (ret) {
+		printk(KERN_ERR "failed to register backlight device: %d\n", ret);
+		goto err_plat_reg2;
+	}
+
+	return;
+
+err_plat_reg2:
+	kfree(samsung_bl_data);
+err_data:
+	kfree(samsung_bl_device);
+	return;
+}