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backlight:set bl_pwm as gpio and set it low, make sure backlight be off

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This commit is contained in:
lyx
2011-03-07 00:44:21 -08:00
parent 15d8aa5d91
commit bccf1d5352
3 changed files with 34 additions and 2 deletions
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23
arch/arm/mach-rk29/board-rk29sdk.c
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@@ -1017,6 +1017,7 @@ static struct platform_device rk29_device_camera = {
#define PWM_MUX_NAME GPIO1B5_PWM0_NAME
#define PWM_MUX_MODE GPIO1L_PWM0
#define PWM_MUX_MODE_GPIO GPIO1L_GPIO1B5
#define PWM_GPIO RK29_PIN1_PB5
#define PWM_EFFECT_VALUE 1
//#define LCD_DISP_ON_PIN
@@ -1057,11 +1058,33 @@ static int rk29_backlight_io_deinit(void)
rk29_mux_api_set(PWM_MUX_NAME, PWM_MUX_MODE_GPIO);
return ret;
}
static int rk29_backlight_pwm_suspend(void)
{
int ret = 0;
rk29_mux_api_set(PWM_MUX_NAME, PWM_MUX_MODE_GPIO);
if (ret = gpio_request(PWM_GPIO, NULL)) {
printk("func %s, line %d: request gpio fail\n", __FUNCTION__, __LINE__);
return -1;
}
gpio_direction_output(PWM_GPIO, GPIO_LOW);
return ret;
}
static int rk29_backlight_pwm_resume(void)
{
gpio_free(PWM_GPIO);
rk29_mux_api_set(PWM_MUX_NAME, PWM_MUX_MODE);
return 0;
}
struct rk29_bl_info rk29_bl_info = {
.pwm_id = PWM_ID,
.bl_ref = PWM_EFFECT_VALUE,
.io_init = rk29_backlight_io_init,
.io_deinit = rk29_backlight_io_deinit,
.pwm_suspend = rk29_backlight_pwm_suspend,
.pwm_resume = rk29_backlight_pwm_resume,
};
#endif
/*****************************************************************************************

2
arch/arm/mach-rk29/include/mach/board.h
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@@ -81,6 +81,8 @@ struct rk29_bl_info{
u32 bl_ref;
int (*io_init)(void);
int (*io_deinit)(void);
int (*pwm_suspend)(void);
int (*pwm_resume)(void);
struct timer_list timer;
struct notifier_block freq_transition;
};

11
drivers/video/backlight/rk29_backlight.c Normal file → Executable file
View File

@@ -164,6 +164,10 @@ static void rk29_delaybacklight_timer(unsigned long data)
struct rk29_bl_info *rk29_bl_info = (struct rk29_bl_info *)data;
u32 id, brightness;
u32 div_total, divh;
if (rk29_bl_info->pwm_resume)
rk29_bl_info->pwm_resume();
clk_enable(pwm_clk);
id = rk29_bl_info->pwm_id;
brightness = rk29_bl->props.brightness;
@@ -197,9 +201,12 @@ static void rk29_bl_suspend(struct early_suspend *h)
}
write_pwm_reg(id, PWM_REG_HRC, divh);
if (!suspend_flag)
if (!suspend_flag) {
clk_disable(pwm_clk);
if (rk29_bl_info->pwm_suspend)
rk29_bl_info->pwm_suspend();
}
suspend_flag = 1;
del_timer_sync(&rk29_bl_info->timer);
}