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A22:improve backlight driver

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root
2011-07-22 06:30:40 +08:00
parent 2bfb3da958
commit 5c346e52c0
1 changed files with 24 additions and 15 deletions
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39
drivers/video/backlight/aw9364_bl.c
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@@ -42,6 +42,8 @@ struct aw9364_backlight_data {
int suspend_flag;
int shutdown_flag;
#endif
spinlock_t bl_lock;
};
#ifdef CONFIG_HAS_EARLYSUSPEND
@@ -64,35 +66,32 @@ static int aw9364_backlight_set(struct backlight_device *bl, int brightness)
{
struct aw9364_backlight_data *data = bl_get_data(bl);
int i,num_clk, num_clk_to, num_clk_from;
if(data && data->pin_en)
gpio_request(data->pin_en, NULL);
else
return -1;
unsigned long flags;
brightness = brightness & 0xff; //0-256
num_clk_from = 16 -(data->current_brightness>>4);
num_clk_to = 16 -(brightness>>4);
num_clk = (16 + num_clk_to - num_clk_from)%16;
num_clk = (16 + num_clk_to - num_clk_from)%16;
if(brightness < 16)
{
gpio_direction_output(data->pin_en, GPIO_LOW);
mdelay(3);
}
else {
for(i=0; i<num_clk; i++)
spin_lock_irqsave(&data->bl_lock, flags);
for(i=0; i<num_clk; i++) //the wave should not be intterupted
{
gpio_direction_output(data->pin_en, GPIO_LOW);
udelay(5);
gpio_direction_output(data->pin_en, GPIO_HIGH);
gpio_set_value(data->pin_en, GPIO_LOW);
gpio_set_value(data->pin_en, GPIO_HIGH);
if(i==0)
udelay(50);
else
udelay(2);
udelay(30);
}
spin_unlock_irqrestore(&data->bl_lock, flags);
}
DBG("%s:current_bl=%d,bl=%d,num_clk_to=%d,num_clk_from=%d,num_clk=%d\n",__FUNCTION__,
data->current_brightness,brightness,num_clk_to,num_clk_from,num_clk);
@@ -194,6 +193,13 @@ static int aw9364_backlight_probe(struct platform_device *pdev)
bl->props.brightness = BL_INIT_VALUE;
bl->props.max_brightness= BL_SET;
if(data && data->pin_en)
gpio_request(data->pin_en, NULL);
else
return -1;
spin_lock_init(&data->bl_lock);
platform_set_drvdata(pdev, bl);
#ifdef CONFIG_HAS_EARLYSUSPEND
@@ -206,6 +212,9 @@ static int aw9364_backlight_probe(struct platform_device *pdev)
g_aw9364_data = data;
#endif
gpio_direction_output(data->pin_en, GPIO_LOW);
mdelay(3);
backlight_update_status(bl);
schedule_delayed_work(&data->work, msecs_to_jiffies(100));