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[PATCH] backlight: lcd: Remove dependenct from the framebuffer layer

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The backlight layer should be independent from the framebuffer layer.  It
can use the services offered by the framebuffer, but its absence should not
prevent the backlight/lcd layer from functioning.

[akpm@osdl.org: cleanups]
Signed-off-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
James Simmons
2006-12-08 02:40:47 -08:00
committed by Linus Torvalds
parent b5bd1cec89
commit 3d5eeaddad
2 changed files with 104 additions and 61 deletions
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87
drivers/video/backlight/backlight.c
View File

@@ -14,6 +14,59 @@
#include <linux/err.h>
#include <linux/fb.h>
#if defined(CONFIG_FB) || (defined(CONFIG_FB_MODULE) && \
defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE))
/* This callback gets called when something important happens inside a
* framebuffer driver. We're looking if that important event is blanking,
* and if it is, we're switching backlight power as well ...
*/
static int fb_notifier_callback(struct notifier_block *self,
unsigned long event, void *data)
{
struct backlight_device *bd;
struct fb_event *evdata = data;
/* If we aren't interested in this event, skip it immediately ... */
if (event != FB_EVENT_BLANK)
return 0;
bd = container_of(self, struct backlight_device, fb_notif);
down(&bd->sem);
if (bd->props)
if (!bd->props->check_fb ||
bd->props->check_fb(evdata->info)) {
bd->props->fb_blank = *(int *)evdata->data;
if (likely(bd->props && bd->props->update_status))
bd->props->update_status(bd);
}
up(&bd->sem);
return 0;
}
static int backlight_register_fb(struct backlight_device *bd)
{
memset(&bd->fb_notif, 0, sizeof(bd->fb_notif));
bd->fb_notif.notifier_call = fb_notifier_callback;
return fb_register_client(&bd->fb_notif);
}
static void backlight_unregister_fb(struct backlight_device *bd)
{
fb_unregister_client(&bd->fb_notif);
}
#else
static inline int backlight_register_fb(struct backlight_device *bd)
{
return 0;
}
static inline void backlight_unregister_fb(struct backlight_device *bd)
{
}
#endif /* CONFIG_FB */
static ssize_t backlight_show_power(struct class_device *cdev, char *buf)
{
int rc = -ENXIO;
@@ -151,33 +204,6 @@ static const struct class_device_attribute bl_class_device_attributes[] = {
DECLARE_ATTR(max_brightness, 0444, backlight_show_max_brightness, NULL),
};
/* This callback gets called when something important happens inside a
* framebuffer driver. We're looking if that important event is blanking,
* and if it is, we're switching backlight power as well ...
*/
static int fb_notifier_callback(struct notifier_block *self,
unsigned long event, void *data)
{
struct backlight_device *bd;
struct fb_event *evdata =(struct fb_event *)data;
/* If we aren't interested in this event, skip it immediately ... */
if (event != FB_EVENT_BLANK)
return 0;
bd = container_of(self, struct backlight_device, fb_notif);
down(&bd->sem);
if (bd->props)
if (!bd->props->check_fb ||
bd->props->check_fb(evdata->info)) {
bd->props->fb_blank = *(int *)evdata->data;
if (likely(bd->props && bd->props->update_status))
bd->props->update_status(bd);
}
up(&bd->sem);
return 0;
}
/**
* backlight_device_register - create and register a new object of
* backlight_device class.
@@ -215,10 +241,7 @@ error: kfree(new_bd);
return ERR_PTR(rc);
}
memset(&new_bd->fb_notif, 0, sizeof(new_bd->fb_notif));
new_bd->fb_notif.notifier_call = fb_notifier_callback;
rc = fb_register_client(&new_bd->fb_notif);
rc = backlight_register_fb(new_bd);
if (unlikely(rc))
goto error;
@@ -268,7 +291,7 @@ void backlight_device_unregister(struct backlight_device *bd)
bd->props = NULL;
up(&bd->sem);
fb_unregister_client(&bd->fb_notif);
backlight_unregister_fb(bd);
class_device_unregister(&bd->class_dev);
}