backlight: if brightness is zero, disable backlight

diff --git a/drivers/video/backlight/rk29_backlight.c b/drivers/video/backlight/rk29_backlight.c
index 3412f293119364542807f61dcfcd20a2cbd78670..cad9ca6543d579b7b5c357ac58bdca8555d7661b 100755 (executable)
--- a/drivers/video/backlight/rk29_backlight.c
+++ b/drivers/video/backlight/rk29_backlight.c
@@ -121,7 +121,19 @@ static int rk29_bl_update_status(struct backlight_device *bl)
        }
        write_pwm_reg(id, PWM_REG_HRC, divh);
 
-       DBG("%s:line=%d,brightness = %d, div_total = %d, divh = %d\n",__FUNCTION__,__LINE__,brightness, div_total, divh);
+       if ((bl->props.state & BL_CORE_DRIVER1) && brightness ==0 ){  //BL_CORE_DRIVER1 is the flag if backlight is closed.
+               bl->props.state &= ~BL_CORE_DRIVER1;
+               clk_disable(pwm_clk);
+               if (rk29_bl_info->pwm_suspend)
+                       rk29_bl_info->pwm_suspend();
+       }else if(!(bl->props.state & BL_CORE_DRIVER1) && brightness != 0){
+               bl->props.state |= BL_CORE_DRIVER1;
+               if (rk29_bl_info->pwm_resume)
+                       rk29_bl_info->pwm_resume();
+               clk_enable(pwm_clk);
+       }
+
+       DBG("%s:line=%d,brightness = %d, div_total = %d, divh = %d state=%x \n",__FUNCTION__,__LINE__,brightness, div_total, divh,bl->props.state);
        return 0;
 }
 
@@ -170,12 +182,6 @@ static void rk29_bl_suspend(struct early_suspend *h)
                rk29_bl->props.brightness = brightness;
        }
 
-       if (!suspend_flag) {
-               clk_disable(pwm_clk);
-               if (rk29_bl_info->pwm_suspend)
-                       rk29_bl_info->pwm_suspend();
-       }
-
        suspend_flag = 1;
 }
 
@@ -183,12 +189,7 @@ static void rk29_bl_resume(struct early_suspend *h)
 {
        struct rk29_bl_info *rk29_bl_info = bl_get_data(rk29_bl);
        DBG("%s : %s\n", __FILE__, __FUNCTION__);
-
-       if (rk29_bl_info->pwm_resume)
-               rk29_bl_info->pwm_resume();
-
-       clk_enable(pwm_clk);
-
+       
        suspend_flag = 0;
        schedule_delayed_work(&rk29_backlight_work, msecs_to_jiffies(rk29_bl_info->delay_ms));
 }
@@ -284,6 +285,7 @@ static int rk29_backlight_probe(struct platform_device *pdev)
        rk29_bl->props.power = FB_BLANK_UNBLANK;
        rk29_bl->props.fb_blank = FB_BLANK_UNBLANK;
        rk29_bl->props.brightness = BL_STEP / 2;
+       rk29_bl->props.state = BL_CORE_DRIVER1;         
 
        schedule_delayed_work(&rk29_backlight_work, msecs_to_jiffies(rk29_bl_info->delay_ms));
        ret = device_create_file(&pdev->dev,&dev_attr_rk29backlight);