backlight: Clean up pmac_backlight handling

Move the setting/unsetting of pmac_backlight into the
backlight core instead of doing it in each driver.

Signed-off-by: Richard Purdie <rpurdie@rpsys.net>

1 files changed, 17 insertions, 0 deletions

diff --git a/drivers/video/backlight/backlight.c b/drivers/video/backlight/backlight.c
index 5490b2ae5134..822a373d3346 100644
--- a/drivers/video/backlight/backlight.c
+++ b/drivers/video/backlight/backlight.c
@@ -14,6 +14,9 @@
 #include <linux/err.h>
 #include <linux/fb.h>
 
+#ifdef CONFIG_PMAC_BACKLIGHT
+#include <asm/backlight.h>
+#endif
 
 #if defined(CONFIG_FB) || (defined(CONFIG_FB_MODULE) && \
                            defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE))
@@ -262,6 +265,13 @@ struct backlight_device *backlight_device_register(const char *name,
                 }
         }
 
+#ifdef CONFIG_PMAC_BACKLIGHT
+        mutex_lock(&pmac_backlight_mutex);
+        if (!pmac_backlight)
+                pmac_backlight = new_bd;
+        mutex_unlock(&pmac_backlight_mutex);
+#endif
+
         return new_bd;
 }
 EXPORT_SYMBOL(backlight_device_register);
@@ -281,6 +291,13 @@ void backlight_device_unregister(struct backlight_device *bd)
 
         pr_debug("backlight_device_unregister: name=%s\n", bd->class_dev.class_id);
 
+#ifdef CONFIG_PMAC_BACKLIGHT
+        mutex_lock(&pmac_backlight_mutex);
+        if (pmac_backlight == bd)
+                pmac_backlight = NULL;
+        mutex_unlock(&pmac_backlight_mutex);
+#endif
+
         for (i = 0; i < ARRAY_SIZE(bl_class_device_attributes); i++)
                 class_device_remove_file(&bd->class_dev,
                                          &bl_class_device_attributes[i]);