Pull platform-drivers into test branch

[linux-drm-fsl-dcu.git] / drivers / video / backlight / backlight.c

diff --git a/drivers/video/backlight/backlight.c b/drivers/video/backlight/backlight.c
index 1d97cdf6f38249ca3bb8b24f3f2be512f2df1cde..9601bfe309ac2744c922a1f612eb4b6188e12aa0 100644 (file)
--- 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;
@@ -142,7 +195,7 @@ static struct class backlight_class = {
        .store  = _store,                                       \
 }
 
-static struct class_device_attribute bl_class_device_attributes[] = {
+static const struct class_device_attribute bl_class_device_attributes[] = {
        DECLARE_ATTR(power, 0644, backlight_show_power, backlight_store_power),
        DECLARE_ATTR(brightness, 0644, backlight_show_brightness,
                     backlight_store_brightness),
@@ -151,33 +204,6 @@ static 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.
@@ -218,10 +244,7 @@ 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;
 
@@ -262,16 +285,10 @@ void backlight_device_unregister(struct backlight_device *bd)
                                         &bl_class_device_attributes[i]);
 
        down(&bd->sem);
-       if (likely(bd->props && bd->props->update_status)) {
-               bd->props->brightness = 0;
-               bd->props->power = 0;
-               bd->props->update_status(bd);
-       }
-
        bd->props = NULL;
        up(&bd->sem);
 
-       fb_unregister_client(&bd->fb_notif);
+       backlight_unregister_fb(bd);
 
        class_device_unregister(&bd->class_dev);
 }