backlight: introduce backlight_device_registered

Introduce a new API for modules to query if a specific type of backlight
device has been registered. This is useful for some backlight device
provider module (e.g. ACPI video) to know if a native control
interface(e.g. the interface created by i915) is available and then do
things accordingly (e.g. avoid registering its own on Win8 systems).

Signed-off-by: Aaron Lu <aaron.lu@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/video/backlight/backlight.c b/drivers/video/backlight/backlight.c
index 94a403a..5d05555 100644 (file)
--- a/drivers/video/backlight/backlight.c
+++ b/drivers/video/backlight/backlight.c
@@ -21,6 +21,9 @@
 #include <asm/backlight.h>
 #endif
 
+static struct list_head backlight_dev_list;
+static struct mutex backlight_dev_list_mutex;
+
 static const char *const backlight_types[] = {
        [BACKLIGHT_RAW] = "raw",
        [BACKLIGHT_PLATFORM] = "platform",
@@ -349,10 +352,32 @@ struct backlight_device *backlight_device_register(const char *name,
        mutex_unlock(&pmac_backlight_mutex);
 #endif
 
+       mutex_lock(&backlight_dev_list_mutex);
+       list_add(&new_bd->entry, &backlight_dev_list);
+       mutex_unlock(&backlight_dev_list_mutex);
+
        return new_bd;
 }
 EXPORT_SYMBOL(backlight_device_register);
 
+bool backlight_device_registered(enum backlight_type type)
+{
+       bool found = false;
+       struct backlight_device *bd;
+
+       mutex_lock(&backlight_dev_list_mutex);
+       list_for_each_entry(bd, &backlight_dev_list, entry) {
+               if (bd->props.type == type) {
+                       found = true;
+                       break;
+               }
+       }
+       mutex_unlock(&backlight_dev_list_mutex);
+
+       return found;
+}
+EXPORT_SYMBOL(backlight_device_registered);
+
 /**
  * backlight_device_unregister - unregisters a backlight device object.
  * @bd: the backlight device object to be unregistered and freed.
@@ -364,6 +389,10 @@ void backlight_device_unregister(struct backlight_device *bd)
        if (!bd)
                return;
 
+       mutex_lock(&backlight_dev_list_mutex);
+       list_del(&bd->entry);
+       mutex_unlock(&backlight_dev_list_mutex);
+
 #ifdef CONFIG_PMAC_BACKLIGHT
        mutex_lock(&pmac_backlight_mutex);
        if (pmac_backlight == bd)
@@ -499,6 +528,8 @@ static int __init backlight_class_init(void)
 
        backlight_class->dev_groups = bl_device_groups;
        backlight_class->pm = &backlight_class_dev_pm_ops;
+       INIT_LIST_HEAD(&backlight_dev_list);
+       mutex_init(&backlight_dev_list_mutex);
        return 0;
 }
 

diff --git a/include/linux/backlight.h b/include/linux/backlight.h
index 53b7794..5f9cd96 100644 (file)
--- a/include/linux/backlight.h
+++ b/include/linux/backlight.h
@@ -100,6 +100,9 @@ struct backlight_device {
        /* The framebuffer notifier block */
        struct notifier_block fb_notif;
 
+       /* list entry of all registered backlight devices */
+       struct list_head entry;
+
        struct device dev;
 };
 
@@ -123,6 +126,7 @@ extern void devm_backlight_device_unregister(struct device *dev,
                                        struct backlight_device *bd);
 extern void backlight_force_update(struct backlight_device *bd,
                                   enum backlight_update_reason reason);
+extern bool backlight_device_registered(enum backlight_type type);
 
 #define to_backlight_device(obj) container_of(obj, struct backlight_device, dev)