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add max limit and brightness updata mode in rk29 bl

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xxx
2013-01-29 17:37:12 +08:00
parent 7334805133
commit 3f77b7bb06
3 changed files with 90 additions and 14 deletions
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3
arch/arm/mach-rk30/board-rk3168-tb.c
View File

@@ -196,6 +196,9 @@ static int rk29_backlight_pwm_resume(void)
static struct rk29_bl_info rk29_bl_info = {
.pwm_id = PWM_ID,
.min_brightness=20,
.max_brightness=255,
.brightness_mode =1,
.bl_ref = PWM_EFFECT_VALUE,
.io_init = rk29_backlight_io_init,
.io_deinit = rk29_backlight_io_deinit,

2
arch/arm/plat-rk/include/plat/board.h
View File

@@ -64,6 +64,8 @@ struct rk29_bl_info {
int (*pwm_suspend)(void);
int (*pwm_resume)(void);
int min_brightness; /* 0 ~ 255 */
int max_brightness; /* 0 ~ 255 */
int brightness_mode;
unsigned int delay_ms; /* in milliseconds */
int pre_div;
};

99
drivers/video/backlight/rk29_backlight.c
View File

@@ -30,7 +30,8 @@
#define PWM_DIV PWM_DIV2
#define PWM_APB_PRE_DIV 1000
#define BL_STEP 255
#define BL_STEP (255)
#define MAX_BRIGHTNESS_CORRECT (50)
/*
* Debug
@@ -84,6 +85,64 @@ static DEVICE_ATTR(rk29backlight, 0660, backlight_read, backlight_write);
static DEFINE_MUTEX(backlight_mutex);
static inline void rk29_bl_min_brightness_check(struct rk29_bl_info *rk29_bl_info)
{
if (rk29_bl_info->min_brightness < 0 || rk29_bl_info->min_brightness > BL_STEP)
rk29_bl_info->min_brightness = MAX_BRIGHTNESS_CORRECT;
}
static inline void rk29_bl_max_brightness_check(struct rk29_bl_info *rk29_bl_info)
{
if (rk29_bl_info->max_brightness <= 0 || rk29_bl_info->max_brightness > BL_STEP)
rk29_bl_info->max_brightness = BL_STEP;
}
int rk29_bl_val_scalor_line(struct rk29_bl_info *rk29_bl_info,int brightness)
{
//rk29_bl_min_brightness_check(rk29_bl_info);
//rk29_bl_max_brightness_check(rk29_bl_info);
if(rk29_bl_info->max_brightness<rk29_bl_info->min_brightness)
rk29_bl_info->max_brightness=rk29_bl_info->min_brightness;
if(brightness>rk29_bl_info->max_brightness)
brightness=rk29_bl_info->max_brightness;
else if(brightness<rk29_bl_info->min_brightness)
brightness=rk29_bl_info->min_brightness;
#if 0
brightness = brightness*(rk29_bl_info->max_brightness - rk29_bl_info->min_brightness);
brightness = (brightness/255) + rk29_bl_info->min_brightness;
#endif
return brightness;
}
int rk29_bl_val_scalor_conic(struct rk29_bl_info *rk29_bl_info,int brightness)
{
//rk29_bl_min_brightness_check(rk29_bl_info);
//rk29_bl_max_brightness_check(rk29_bl_info);
if(rk29_bl_info->max_brightness<rk29_bl_info->min_brightness)
rk29_bl_info->max_brightness=rk29_bl_info->min_brightness;
#if 0
brightness = (brightness*brightness)*(rk29_bl_info->max_brightness - rk29_bl_info->min_brightness);
brightness = (brightness/(BL_STEP*BL_STEP)) + rk29_bl_info->min_brightness;
#else
if(brightness<rk29_bl_info->min_brightness)
brightness=rk29_bl_info->min_brightness;
brightness = (brightness-rk29_bl_info->min_brightness)*(brightness-rk29_bl_info->min_brightness);
brightness = (brightness/(rk29_bl_info->max_brightness - rk29_bl_info->min_brightness)) + rk29_bl_info->min_brightness;
#endif
if(brightness > rk29_bl_info->max_brightness)
brightness = rk29_bl_info->max_brightness;
if(brightness < rk29_bl_info->min_brightness)
brightness = rk29_bl_info->min_brightness;
return brightness;
}
static int rk29_bl_update_status(struct backlight_device *bl)
{
u32 divh,div_total;
@@ -93,19 +152,18 @@ static int rk29_bl_update_status(struct backlight_device *bl)
int brightness = 0;
mutex_lock(&backlight_mutex);
//BL_CORE_DRIVER2 is the flag if backlight is into early_suspend.
//BL_CORE_DRIVER2 is the flag if backlight is into early_suspend.
if (suspend_flag && (bl->props.state & BL_CORE_DRIVER2))
goto out;
brightness = bl->props.brightness;
if(rk29_bl_info->min_brightness){
if(brightness){
brightness = brightness*(256 - rk29_bl_info->min_brightness);
brightness = (brightness>>8) + rk29_bl_info->min_brightness;
}
if(brightness > 255)
brightness = 255;
}
if(!rk29_bl_info->brightness_mode)
brightness=rk29_bl_val_scalor_line(rk29_bl_info,brightness);
else
brightness=rk29_bl_val_scalor_conic(rk29_bl_info,brightness);
//printk("%s,req brightness=%d,real is=%d\n",__FUNCTION__,bl->props.brightness,brightness);
if (bl->props.power != FB_BLANK_UNBLANK)
brightness = 0;
@@ -260,10 +318,23 @@ static int rk29_backlight_probe(struct platform_device *pdev)
if (!rk29_bl_info->delay_ms)
rk29_bl_info->delay_ms = 100;
if (rk29_bl_info->min_brightness < 0 || rk29_bl_info->min_brightness > BL_STEP)
rk29_bl_info->min_brightness = 52;
rk29_bl_min_brightness_check(rk29_bl_info);
rk29_bl_max_brightness_check(rk29_bl_info);
#if 0
{
int temp,temp_val;
rk29_bl_info->max_brightness=180;
rk29_bl_info->min_brightness=20;
for(temp=0;temp<=255;temp++)
{
temp_val=rk29_bl_val_scalor_conic(rk29_bl_info,temp);
//if(temp_val<=rk29_bl_info->max_brightness)
printk("conic req %d,get %d\n",temp,temp_val);
}
}
#endif
if (rk29_bl_info && rk29_bl_info->io_init) {
rk29_bl_info->io_init();
}