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Diffstat (limited to 'include/linux/backlight.h')
-rw-r--r--include/linux/backlight.h33
1 files changed, 19 insertions, 14 deletions
diff --git a/include/linux/backlight.h b/include/linux/backlight.h
index 43c6d55644b5..1023ba0d6e55 100644
--- a/include/linux/backlight.h
+++ b/include/linux/backlight.h
@@ -14,8 +14,8 @@
/* Notes on locking:
*
- * backlight_device->props_lock is an internal backlight lock protecting the
- * props field and no code outside the core should need to touch it.
+ * backlight_device->ops_lock is an internal backlight lock protecting the
+ * ops pointer and no code outside the core should need to touch it.
*
* Access to update_status() is serialised by the update_lock mutex since
* most drivers seem to need this and historically get it wrong.
@@ -30,9 +30,7 @@
struct backlight_device;
struct fb_info;
-/* This structure defines all the properties of a backlight
- (usually attached to a LCD). */
-struct backlight_properties {
+struct backlight_ops {
/* Notify the backlight driver some property has changed */
int (*update_status)(struct backlight_device *);
/* Return the current backlight brightness (accounting for power,
@@ -41,7 +39,10 @@ struct backlight_properties {
/* Check if given framebuffer device is the one bound to this backlight;
return 0 if not, !=0 if it is. If NULL, backlight always matches the fb. */
int (*check_fb)(struct fb_info *);
+};
+/* This structure defines all the properties of a backlight */
+struct backlight_properties {
/* Current User requested brightness (0 - max_brightness) */
int brightness;
/* Maximal value for brightness (read-only) */
@@ -54,14 +55,18 @@ struct backlight_properties {
};
struct backlight_device {
- /* This protects the 'props' field. If 'props' is NULL, the driver that
- registered this device has been unloaded, and if class_get_devdata()
- points to something in the body of that driver, it is also invalid. */
- struct mutex props_lock;
- /* If this is NULL, the backing module is unloaded */
- struct backlight_properties *props;
+ /* Backlight properties */
+ struct backlight_properties props;
+
/* Serialise access to update_status method */
struct mutex update_lock;
+
+ /* This protects the 'ops' field. If 'ops' is NULL, the driver that
+ registered this device has been unloaded, and if class_get_devdata()
+ points to something in the body of that driver, it is also invalid. */
+ struct mutex ops_lock;
+ struct backlight_ops *ops;
+
/* The framebuffer notifier block */
struct notifier_block fb_notif;
/* The class device structure */
@@ -71,13 +76,13 @@ struct backlight_device {
static inline void backlight_update_status(struct backlight_device *bd)
{
mutex_lock(&bd->update_lock);
- if (bd->props && bd->props->update_status)
- bd->props->update_status(bd);
+ if (bd->ops && bd->ops->update_status)
+ bd->ops->update_status(bd);
mutex_unlock(&bd->update_lock);
}
extern struct backlight_device *backlight_device_register(const char *name,
- struct device *dev,void *devdata,struct backlight_properties *bp);
+ struct device *dev, void *devdata, struct backlight_ops *ops);
extern void backlight_device_unregister(struct backlight_device *bd);
#define to_backlight_device(obj) container_of(obj, struct backlight_device, class_dev)