1 files changed, 55 insertions, 32 deletions

diff --git a/drivers/video/backlight/backlight.c b/drivers/video/backlight/backlight.c
index f439a588394a..1dac9e743427 100644
--- a/drivers/video/backlight/backlight.c
+++ b/drivers/video/backlight/backlight.c
@@ -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);
 }