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backlight: Add suspend/resume support to the backlight core 

Add suspend/resume support to the backlight core and enable use of it
by appropriate drivers.

Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>
This commit is contained in:
Richard Purdie 2009-01-06 21:00:19 +00:00
parent 9be1df98bc
commit c835ee7f41
4 changed files with 63 additions and 33 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

34
drivers/video/backlight/backlight.c
View File

@ -40,6 +40,10 @@ static int fb_notifier_callback(struct notifier_block *self,
if (!bd->ops->check_fb ||
bd->ops->check_fb(evdata->info)) {
bd->props.fb_blank = *(int *)evdata->data;
if (bd->props.fb_blank == FB_BLANK_UNBLANK)
bd->props.state &= ~BL_CORE_FBBLANK;
else
bd->props.state |= BL_CORE_FBBLANK;
backlight_update_status(bd);
}
mutex_unlock(&bd->ops_lock);
@ -165,6 +169,34 @@ static ssize_t backlight_show_actual_brightness(struct device *dev,
static struct class *backlight_class;
static int backlight_suspend(struct device *dev, pm_message_t state)
{
struct backlight_device *bd = to_backlight_device(dev);
if (bd->ops->options & BL_CORE_SUSPENDRESUME) {
mutex_lock(&bd->ops_lock);
bd->props.state |= BL_CORE_SUSPENDED;
backlight_update_status(bd);
mutex_unlock(&bd->ops_lock);
}
return 0;
}
static int backlight_resume(struct device *dev)
{
struct backlight_device *bd = to_backlight_device(dev);
if (bd->ops->options & BL_CORE_SUSPENDRESUME) {
mutex_lock(&bd->ops_lock);
bd->props.state &= ~BL_CORE_SUSPENDED;
backlight_update_status(bd);
mutex_unlock(&bd->ops_lock);
}
return 0;
}
static void bl_device_release(struct device *dev)
{
struct backlight_device *bd = to_backlight_device(dev);
@ -281,6 +313,8 @@ static int __init backlight_class_init(void)
}
backlight_class->dev_attrs = bl_device_attributes;
backlight_class->suspend = backlight_suspend;
backlight_class->resume = backlight_resume;
return 0;
}

45
drivers/video/backlight/corgi_bl.c
View File

@ -24,9 +24,8 @@ static struct backlight_properties corgibl_data;
static struct backlight_device *corgi_backlight_device;
static struct generic_bl_info *bl_machinfo;
static unsigned long corgibl_flags;
#define CORGIBL_SUSPENDED 0x01
#define CORGIBL_BATTLOW 0x02
/* Flag to signal when the battery is low */
#define CORGIBL_BATTLOW BL_CORE_DRIVER1
static int corgibl_send_intensity(struct backlight_device *bd)
{
@ -34,11 +33,11 @@ static int corgibl_send_intensity(struct backlight_device *bd)
if (bd->props.power != FB_BLANK_UNBLANK)
intensity = 0;
if (bd->props.fb_blank != FB_BLANK_UNBLANK)
if (bd->props.state & BL_CORE_FBBLANK)
intensity = 0;
if (corgibl_flags & CORGIBL_SUSPENDED)
if (bd->props.state & BL_CORE_SUSPENDED)
intensity = 0;
if (corgibl_flags & CORGIBL_BATTLOW)
if (bd->props.state & CORGIBL_BATTLOW)
intensity &= bl_machinfo->limit_mask;
bl_machinfo->set_bl_intensity(intensity);
@ -51,29 +50,6 @@ static int corgibl_send_intensity(struct backlight_device *bd)
return 0;
}
#ifdef CONFIG_PM
static int corgibl_suspend(struct platform_device *pdev, pm_message_t state)
{
struct backlight_device *bd = platform_get_drvdata(pdev);
corgibl_flags |= CORGIBL_SUSPENDED;
backlight_update_status(bd);
return 0;
}
static int corgibl_resume(struct platform_device *pdev)
{
struct backlight_device *bd = platform_get_drvdata(pdev);
corgibl_flags &= ~CORGIBL_SUSPENDED;
backlight_update_status(bd);
return 0;
}
#else
#define corgibl_suspend NULL
#define corgibl_resume NULL
#endif
static int corgibl_get_intensity(struct backlight_device *bd)
{
return corgibl_intensity;
@ -85,16 +61,21 @@ static int corgibl_get_intensity(struct backlight_device *bd)
*/
void corgibl_limit_intensity(int limit)
{
struct backlight_device *bd = corgi_backlight_device;
mutex_lock(&bd->ops_lock);
if (limit)
corgibl_flags |= CORGIBL_BATTLOW;
bd->props.state |= CORGIBL_BATTLOW;
else
corgibl_flags &= ~CORGIBL_BATTLOW;
bd->props.state &= ~CORGIBL_BATTLOW;
backlight_update_status(corgi_backlight_device);
mutex_unlock(&bd->ops_lock);
}
EXPORT_SYMBOL(corgibl_limit_intensity);
static struct backlight_ops corgibl_ops = {
.options = BL_CORE_SUSPENDRESUME,
.get_brightness = corgibl_get_intensity,
.update_status = corgibl_send_intensity,
};
@ -144,8 +125,6 @@ static int corgibl_remove(struct platform_device *pdev)
static struct platform_driver corgibl_driver = {
.probe = corgibl_probe,
.remove = corgibl_remove,
.suspend = corgibl_suspend,
.resume = corgibl_resume,
.driver = {
.name = "generic-bl",
},

1
drivers/video/backlight/mbp_nvidia_bl.c
View File

@ -70,6 +70,7 @@ static int mbp_get_intensity(struct backlight_device *bd)
}
static struct backlight_ops mbp_ops = {
.options = BL_CORE_SUSPENDRESUME,
.get_brightness = mbp_get_intensity,
.update_status = mbp_send_intensity,
};

16
include/linux/backlight.h
View File

@ -31,6 +31,10 @@ struct backlight_device;
struct fb_info;
struct backlight_ops {
unsigned int options;
#define BL_CORE_SUSPENDRESUME (1 << 0)
/* Notify the backlight driver some property has changed */
int (*update_status)(struct backlight_device *);
/* Return the current backlight brightness (accounting for power,
@ -51,7 +55,19 @@ struct backlight_properties {
modes; 4: full off), see FB_BLANK_XXX */
int power;
/* FB Blanking active? (values as for power) */
/* Due to be removed, please use (state & BL_CORE_FBBLANK) */
int fb_blank;
/* Flags used to signal drivers of state changes */
/* Upper 4 bits are reserved for driver internal use */
unsigned int state;
#define BL_CORE_SUSPENDED (1 << 0) /* backlight is suspended */
#define BL_CORE_FBBLANK (1 << 1) /* backlight is under an fb blank event */
#define BL_CORE_DRIVER4 (1 << 28) /* reserved for driver specific use */
#define BL_CORE_DRIVER3 (1 << 29) /* reserved for driver specific use */
#define BL_CORE_DRIVER2 (1 << 30) /* reserved for driver specific use */
#define BL_CORE_DRIVER1 (1 << 31) /* reserved for driver specific use */
};
struct backlight_device {