1 files changed, 329 insertions, 0 deletions
diff --git a/drivers/video/backlight/lcd_panel_cabc_pwm_bl.c b/drivers/video/backlight/lcd_panel_cabc_pwm_bl.c
new file mode 100755
index 00000000..3f7b9875
--- /dev/null
+++ b/drivers/video/backlight/lcd_panel_cabc_pwm_bl.c
@@ -0,0 +1,329 @@
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#ifdef CONFIG_HAS_EARLYSUSPEND
+#include <linux/earlysuspend.h>
+#endif
+#include <linux/platform_device.h>
+#include <linux/fb.h>
+#include <linux/backlight.h>
+#include <linux/err.h>
+#include <linux/gpio.h>
+#include <linux/delay.h>
+#include <linux/spinlock.h>
+#include <linux/rtc.h>
+
+int current_intensity;
+
+static int backlight_mode=1;
+
+#define DIMMING_VALUE		8
+#define MAX_BRIGHTNESS_VALUE	255
+#define MIN_BRIGHTNESS_VALUE	20
+#define BACKLIGHT_DEBUG 1
+#define BACKLIGHT_SUSPEND 0
+#define BACKLIGHT_RESUME 1
+
+#if BACKLIGHT_DEBUG
+#define BLDBG(fmt, args...) printk(fmt, ## args)
+#else
+#define BLDBG(fmt, args...)
+#endif
+
+struct lcd_panel_cabc_pwm_bl_data {
+	struct platform_device *pdev;
+	unsigned int ctrl_pin;
+#ifdef CONFIG_HAS_EARLYSUSPEND
+	struct early_suspend early_suspend_desc;
+#endif
+};
+
+struct brt_value{
+	int level;				// Platform setting values
+	int tune_level;			// Chip Setting values
+};
+
+
+struct brt_value brt_table[] = {
+   { MIN_BRIGHTNESS_VALUE,  8 }, 
+   { 25,  11 },
+   { 30,  14 },
+   { 35,  17 },  
+   { 40,  20 }, 
+   { 45,  23 }, 
+   { 50,  26 },
+   { 55,  29 }, 
+   { 60,  32 },
+   { 65,  35 }, 
+   { 70,  38 },
+   { 75,  41 },
+   { 80,  44 }, 
+   { 85,  47 }, 
+   { 90,  50 }, 
+   { 95,  53 }, 
+   { 100,  56 },   
+   { 105,  59 },
+   { 110,  62 }, 
+   { 115,  65 }, 
+   { 120,  68 },
+   { 125,  71 },
+   { 130,  74 },
+   { 135,  77 },
+   { 140,  80 },
+   { 145,  83 },  
+   { 150,  86 },
+   { 155,  89 },
+   { 160,  91 }, /* default 160 */
+   { 165,  96 },
+   { 170,  101 },
+   { 175,  106 },
+   { 180,  111 },
+   { 185,  116 }, 
+   { 190,  121 },
+   { 195,  126 },
+   { 200,  131 },
+   { 205,  136 },
+   { 210,  141 },
+   { 215,  146 },
+   { 220,  151 },
+   { 225,  156 },
+   { 230,  161 },
+   { 235,  166 },
+   { 240,  171 },
+   { 245,  176 },
+   { 250,  181 },
+   { MAX_BRIGHTNESS_VALUE,  186 }, 
+};
+
+
+#define MAX_BRT_STAGE (int)(sizeof(brt_table)/sizeof(struct brt_value))
+
+extern void backlight_control(int brigtness);
+
+/* input: intensity in percentage 0% - 100% */
+static int lcd_panel_cabc_pwm_backlight_update_status(struct backlight_device *bd)
+{
+	int user_intensity = bd->props.brightness;
+ 	int tune_level = 0;
+	int i;
+  
+	BLDBG("[BACKLIGHT] lcd_panel_cabc_pwm_backlight_update_status ==> user_intensity  : %d\n", user_intensity);
+		
+	if (bd->props.power != FB_BLANK_UNBLANK)
+		user_intensity = 0;
+
+	if (bd->props.fb_blank != FB_BLANK_UNBLANK)
+		user_intensity = 0;
+
+	if (bd->props.state & BL_CORE_SUSPENDED)
+		user_intensity = 0;
+		
+	if(backlight_mode != BACKLIGHT_RESUME)
+	{
+	//	BLDBG("[BACKLIGHT] Returned with invalid backlight mode %d\n", backlight_mode);
+		return 0;
+	}
+
+#if 1
+	tune_level = user_intensity;
+#else
+	if(user_intensity > 0) {
+		if(user_intensity < MIN_BRIGHTNESS_VALUE) {
+			tune_level = DIMMING_VALUE; //DIMMING
+		} else if (user_intensity == MAX_BRIGHTNESS_VALUE) {
+			tune_level = brt_table[MAX_BRT_STAGE-1].tune_level;
+		} else {
+			for(i = 0; i < MAX_BRT_STAGE; i++) {
+				if(user_intensity <= brt_table[i].level ) {
+					tune_level = brt_table[i].tune_level;
+					break;
+				}
+			}
+		}
+	}
+#endif
+		
+	BLDBG("[BACKLIGHT] lcd_panel_cabc_pwm_backlight_update_status ==> tune_level : %d\n", tune_level);
+	
+	backlight_control(tune_level);
+
+	current_intensity = tune_level;
+	
+	return 0;
+}
+
+static int lcd_panel_cabc_pwm_backlight_get_brightness(struct backlight_device *bl)
+{
+	BLDBG("[BACKLIGHT] lcd_panel_cabc_pwm_backlight_get_brightness\n");
+    
+	return current_intensity;
+}
+
+static struct backlight_ops lcd_panel_cabc_pwm_backlight_ops = {
+	.update_status	= lcd_panel_cabc_pwm_backlight_update_status,
+	.get_brightness	= lcd_panel_cabc_pwm_backlight_get_brightness,
+};
+
+#ifdef CONFIG_HAS_EARLYSUSPEND
+static void lcd_panel_cabc_pwm_backlight_earlysuspend(struct early_suspend *desc)
+{
+	struct timespec ts;
+	struct rtc_time tm;
+	
+	backlight_mode=BACKLIGHT_SUSPEND; 
+
+	getnstimeofday(&ts);
+	rtc_time_to_tm(ts.tv_sec, &tm);
+	printk("[%02d:%02d:%02d.%03lu][BACKLIGHT] earlysuspend\n", tm.tm_hour, tm.tm_min, tm.tm_sec, ts.tv_nsec);
+}
+
+static void lcd_panel_cabc_pwm_backlight_lateresume(struct early_suspend *desc)
+{
+	struct lcd_panel_cabc_pwm_bl_data *lcd_panel_cabc_pwm = container_of(desc, struct lcd_panel_cabc_pwm_bl_data, early_suspend_desc);
+	struct backlight_device *bl = platform_get_drvdata(lcd_panel_cabc_pwm->pdev);
+	struct timespec ts;
+	struct rtc_time tm;
+	
+	getnstimeofday(&ts);
+	rtc_time_to_tm(ts.tv_sec, &tm);
+	backlight_mode = BACKLIGHT_RESUME;
+	printk("[%02d:%02d:%02d.%03lu][BACKLIGHT] late resume\n", tm.tm_hour, tm.tm_min, tm.tm_sec, ts.tv_nsec);
+
+	backlight_update_status(bl);
+}
+#else
+#ifdef CONFIG_PM
+static int lcd_panel_cabc_pwm_backlight_suspend(struct platform_device *pdev,
+					pm_message_t state)
+{
+	struct backlight_device *bl = platform_get_drvdata(pdev);
+	struct lcd_panel_cabc_pwm_bl_data *lcd_panel_cabc_pwm = dev_get_drvdata(&bl->dev);
+	  
+	BLDBG("[BACKLIGHT] lcd_panel_cabc_pwm_backlight_suspend\n");
+	      
+	return 0;
+}
+static int lcd_panel_cabc_pwm_backlight_resume(struct platform_device *pdev)
+{
+	struct backlight_device *bl = platform_get_drvdata(pdev);
+  BLDBG("[BACKLIGHT] lcd_panel_cabc_pwm_backlight_resume\n");
+	    
+	backlight_update_status(bl);
+	    
+	return 0;
+}
+#else
+#define lcd_panel_cabc_pwm_backlight_suspend  NULL
+#define lcd_panel_cabc_pwm_backlight_resume   NULL
+#endif /* CONFIG_PM */
+#endif /* CONFIG_HAS_EARLYSUSPEND */
+
+static int lcd_panel_cabc_pwm_backlight_probe(struct platform_device *pdev)
+{
+	struct backlight_device *bl;
+	struct lcd_panel_cabc_pwm_bl_data *lcd_panel_cabc_pwm;
+	struct backlight_properties props;
+	int ret;
+	int max_brightness = 255;
+	int default_brightness = 160;
+	
+	BLDBG("[BACKLIGHT] lcd_panel_cabc_pwm_backlight_probe\n");
+	
+	lcd_panel_cabc_pwm = kzalloc(sizeof(*lcd_panel_cabc_pwm), GFP_KERNEL);
+	if (!lcd_panel_cabc_pwm) {
+		dev_err(&pdev->dev, "no memory for state\n");
+		ret = -ENOMEM;
+		goto err_alloc;
+	}
+
+	memset(&props, 0, sizeof(struct backlight_properties));
+	props.max_brightness = max_brightness;
+	props.type = BACKLIGHT_PLATFORM;
+	bl = backlight_device_register("sprd_backlight", &pdev->dev,
+			lcd_panel_cabc_pwm, &lcd_panel_cabc_pwm_backlight_ops, &props);
+	if (IS_ERR(bl)) {
+		dev_err(&pdev->dev, "failed to register backlight\n");
+		ret = PTR_ERR(bl);
+		goto err_bl;
+	}
+
+#ifdef CONFIG_HAS_EARLYSUSPEND
+	lcd_panel_cabc_pwm->pdev = pdev;
+	lcd_panel_cabc_pwm->early_suspend_desc.level = EARLY_SUSPEND_LEVEL_BLANK_SCREEN;
+	lcd_panel_cabc_pwm->early_suspend_desc.suspend = lcd_panel_cabc_pwm_backlight_earlysuspend;
+	lcd_panel_cabc_pwm->early_suspend_desc.resume = lcd_panel_cabc_pwm_backlight_lateresume;
+	register_early_suspend(&lcd_panel_cabc_pwm->early_suspend_desc);
+#endif
+
+	bl->props.max_brightness = max_brightness;
+	bl->props.brightness = default_brightness;
+	platform_set_drvdata(pdev, bl);
+  //lcd_panel_cabc_pwm_backlight_update_status(bl);
+    
+	return 0;
+	
+err_bl:
+	kfree(lcd_panel_cabc_pwm);
+err_alloc:
+	return ret;
+}
+
+static int lcd_panel_cabc_pwm_backlight_remove(struct platform_device *pdev)
+{
+	struct backlight_device *bl = platform_get_drvdata(pdev);
+	struct lcd_panel_cabc_pwm_bl_data *lcd_panel_cabc_pwm = dev_get_drvdata(&bl->dev);
+
+	backlight_device_unregister(bl);
+
+#ifdef CONFIG_HAS_EARLYSUSPEND
+	unregister_early_suspend(&lcd_panel_cabc_pwm->early_suspend_desc);
+#endif
+
+	kfree(lcd_panel_cabc_pwm);
+
+	return 0;
+}
+
+static int lcd_panel_cabc_pwm_backlight_shutdown(struct platform_device *pdev)
+{
+	printk("[BACKLIGHT] lcd_panel_cabc_pwm_backlight_shutdown\n");
+	return 0;
+}
+
+static const struct of_device_id backlight_of_match[] = {
+	{ .compatible = "sprd,panel_cabc_bl", },
+	{ }
+};
+
+static struct platform_driver lcd_panel_cabc_pwm_backlight_driver = {
+	.driver		= {
+		.name	= "lcd_panel_cabc",
+		.owner	= THIS_MODULE,
+		.of_match_table = backlight_of_match,
+	},
+	.probe		= lcd_panel_cabc_pwm_backlight_probe,
+	.remove		= lcd_panel_cabc_pwm_backlight_remove,
+	.shutdown      = lcd_panel_cabc_pwm_backlight_shutdown,
+#ifndef CONFIG_HAS_EARLYSUSPEND
+	.suspend        = lcd_panel_cabc_pwm_backlight_suspend,
+	.resume         = lcd_panel_cabc_pwm_backlight_resume,
+#endif
+};
+
+static int __init lcd_panel_cabc_pwm_backlight_init(void)
+{
+	return platform_driver_register(&lcd_panel_cabc_pwm_backlight_driver);
+}
+
+module_init(lcd_panel_cabc_pwm_backlight_init);
+
+static void __exit lcd_panel_cabc_pwm_backlight_exit(void)
+{
+	platform_driver_unregister(&lcd_panel_cabc_pwm_backlight_driver);
+}
+
+module_exit(lcd_panel_cabc_pwm_backlight_exit);
+MODULE_DESCRIPTION("lcd_panel_cabc_pwm_bl based Backlight Driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:lcd_panel_cabc_pwm_bl");
+