a22: add button light driver

arch/arm/configs/rk29_a22_defconfig

@@ -1225,6 +1225,7 @@ CONFIG_BACKLIGHT_CLASS_DEVICE=y
 # CONFIG_BACKLIGHT_RK29_BL is not set
 # CONFIG_FIH_TOUCHKEY_LED is not set
 CONFIG_BACKLIGHT_AW9364=y
+CONFIG_BUTTON_LIGHT=y
 
 #
 # Display device support

arch/arm/mach-rk29/board-rk29-a22.c

@@ -1984,6 +1984,20 @@ struct platform_device aw9364_device_backlight = {
 
 #endif
 
+#ifdef CONFIG_BUTTON_LIGHT	 
+struct rk29_button_light_info rk29_button_light_info = {
+	.led_on_pin   = RK29_PIN6_PB4,
+	.led_on_level = GPIO_HIGH,
+};
+
+struct platform_device rk29_device_button_light = {
+		.name	= "rk29_button_light",
+		.id 	= -1,
+		.dev	= {
+		   .platform_data  = &rk29_button_light_info,
+		}
+};
+#endif
 
 /*****************************************************************************************
 * pwm voltage regulator devices
@@ -2493,6 +2507,9 @@ static struct platform_device *devices[] __initdata = {
 #ifdef CONFIG_BACKLIGHT_AW9364
 	&aw9364_device_backlight,
 #endif
+#ifdef CONFIG_BUTTON_LIGHT	  
+	&rk29_device_button_light,
+#endif
 #ifdef CONFIG_RK29_VMAC
 	&rk29_device_vmac,
 #endif

arch/arm/mach-rk29/include/mach/board.h

@@ -22,6 +22,13 @@
 #include <linux/timer.h>
 #include <linux/notifier.h>
 
+struct rk29_button_light_info{
+	u32 led_on_pin;
+	u32 led_on_level;
+	int (*io_init)(void);
+	int (*io_deinit)(void);
+};
+
 /*spi*/
 struct spi_cs_gpio {
 	const char *name;

drivers/video/backlight/Kconfig

@@ -286,4 +286,12 @@ config BACKLIGHT_AW9364
         bool "aw9364 backlight driver"
 	depends on BACKLIGHT_CLASS_DEVICE && ARCH_RK29
 	help
-	  aw9364 backlight support.	  
+	  aw9364 backlight support.	 
+
+config BUTTON_LIGHT
+        bool "rk29 button light driver"
+	depends on BACKLIGHT_CLASS_DEVICE
+	default n
+	help
+	  rk29 button light support.	  
+ 

drivers/video/backlight/Makefile

@@ -32,3 +32,5 @@ obj-$(CONFIG_BACKLIGHT_RK2818_BL) += rk2818_backlight.o
 obj-$(CONFIG_BACKLIGHT_RK29_BL) += rk29_backlight.o
 obj-$(CONFIG_BACKLIGHT_AW9364) += aw9364_bl.o
 obj-$(CONFIG_FIH_TOUCHKEY_LED) += fih_touchkey_led.o
+obj-$(CONFIG_BUTTON_LIGHT) += rk29_buttonlight.o
+

drivers/video/backlight/rk29_buttonlight.c

@@ -0,0 +1,135 @@
+/* 
+ * Copyright (C) 2009 Rockchip Corporation.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+#include <linux/debugfs.h>
+#include <linux/backlight.h>
+#include <linux/fb.h>
+#include <linux/cpufreq.h>
+#include <linux/clk.h>
+
+#include <linux/earlysuspend.h>
+#include <asm/io.h>
+#include <mach/iomux.h>
+#include <mach/gpio.h>
+#include <mach/board.h>
+
+
+/*
+ * Debug
+ */
+#if 0 
+#define DBG(x...)	printk(x)
+#else
+#define DBG(x...)
+#endif
+
+static int rk29_button_light_value = 0;
+struct backlight_device * rk29_button_light_device;
+
+static s32 rk29_set_button_light(struct backlight_device *bl)
+{
+    struct rk29_button_light_info *button_light_info = bl->dev.parent->platform_data;
+
+    DBG(">>>>>>> rk29_set_button_light\n");
+    if(bl->props.brightness)
+        {
+    	gpio_set_value(button_light_info->led_on_pin, button_light_info->led_on_level);
+    	rk29_button_light_value = 255;
+        }
+    else
+        {
+        gpio_set_value(button_light_info->led_on_pin, button_light_info->led_on_level?0:1);
+    	rk29_button_light_value = 0;
+        }
+    return 0;
+}
+
+static s32 rk29_get_button_light(struct backlight_device *bl)
+{
+    DBG(">>>>>>> rk29_get_button_light\n");
+    return rk29_button_light_value;
+}
+
+static struct backlight_ops rk29_button_light_ops = {
+	.update_status = rk29_set_button_light,
+	.get_brightness = rk29_get_button_light,
+};
+
+static int rk29_button_light_probe(struct platform_device *pdev)
+{		 
+    struct rk29_button_light_info *button_light_info = pdev->dev.platform_data;
+    
+	rk29_button_light_device = backlight_device_register("rk29_button_light", &pdev->dev, NULL, &rk29_button_light_ops);
+	if (!rk29_button_light_device) {
+        DBG("rk29_button_light_probe error\n"); 
+		return -ENODEV;		
+	}
+   
+	rk29_button_light_device->props.power = FB_BLANK_UNBLANK;
+	rk29_button_light_device->props.fb_blank = FB_BLANK_UNBLANK;
+	rk29_button_light_device->props.max_brightness = 255;
+	rk29_button_light_device->props.brightness = 255;
+
+    gpio_request(button_light_info->led_on_pin, NULL); 	
+    gpio_direction_output(button_light_info->led_on_pin, button_light_info->led_on_level?0:1);
+    
+    if (button_light_info && button_light_info->io_init)
+        button_light_info->io_init();
+    
+    return 0;
+}
+
+static int rk29_button_light_remove(struct platform_device *pdev)
+{		
+   
+	if (rk29_button_light_device) {
+		backlight_device_unregister(rk29_button_light_device);
+        return 0;
+    } else {
+        DBG("rk29_button_light_remove error\n"); 
+        return -ENODEV;      
+    }
+}
+
+static struct platform_driver rk29_button_light_driver = {
+	.probe	= rk29_button_light_probe,
+	.remove = rk29_button_light_remove,
+	.driver	= {
+		.name	= "rk29_button_light",
+		.owner	= THIS_MODULE,
+	},
+};
+
+
+static int __init rk29_button_light_init(void)
+{
+	platform_driver_register(&rk29_button_light_driver);
+	return 0;
+}
+
+static int __init rk29_button_light_exit(void)
+{
+	platform_driver_unregister(&rk29_button_light_driver);
+	return 0;
+}
+
+late_initcall(rk29_button_light_init);
+module_exit(rk29_button_light_exit);
+