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>

6 files changed, 25 insertions, 90 deletions

diff --git a/drivers/video/aty/aty128fb.c b/drivers/video/aty/aty128fb.c
index ef3e7861c27a..4de8d6252c3c 100644
--- a/drivers/video/aty/aty128fb.c
+++ b/drivers/video/aty/aty128fb.c
@@ -1829,13 +1829,6 @@ static void aty128_bl_init(struct aty128fb_par *par)
         bd->props->power = FB_BLANK_UNBLANK;
         backlight_update_status(bd);
 
-#ifdef CONFIG_PMAC_BACKLIGHT
-        mutex_lock(&pmac_backlight_mutex);
-        if (!pmac_backlight)
-                pmac_backlight = bd;
-        mutex_unlock(&pmac_backlight_mutex);
-#endif
-
         printk("aty128: Backlight initialized (%s)\n", name);
 
         return;
@@ -1846,17 +1839,8 @@ error:
 
 static void aty128_bl_exit(struct backlight_device *bd)
 {
-        if (bd) {
-#ifdef CONFIG_PMAC_BACKLIGHT
-                mutex_lock(&pmac_backlight_mutex);
-                if (pmac_backlight == bd)
-                        pmac_backlight = NULL;
-                mutex_unlock(&pmac_backlight_mutex);
-#endif
-                backlight_device_unregister(bd);
-
-                printk("aty128: Backlight unloaded\n");
-        }
+        backlight_device_unregister(bd);
+        printk("aty128: Backlight unloaded\n");
 }
 #endif /* CONFIG_FB_ATY128_BACKLIGHT */
 
diff --git a/drivers/video/aty/atyfb_base.c b/drivers/video/aty/atyfb_base.c
index 66462286e704..35ba26567598 100644
--- a/drivers/video/aty/atyfb_base.c
+++ b/drivers/video/aty/atyfb_base.c
@@ -2198,13 +2198,6 @@ static void aty_bl_init(struct atyfb_par *par)
         bd->props->power = FB_BLANK_UNBLANK;
         backlight_update_status(bd);
 
-#ifdef CONFIG_PMAC_BACKLIGHT
-        mutex_lock(&pmac_backlight_mutex);
-        if (!pmac_backlight)
-                pmac_backlight = bd;
-        mutex_unlock(&pmac_backlight_mutex);
-#endif
-
         printk("aty: Backlight initialized (%s)\n", name);
 
         return;
@@ -2215,17 +2208,8 @@ error:
 
 static void aty_bl_exit(struct backlight_device *bd)
 {
-        if (bd) {
-#ifdef CONFIG_PMAC_BACKLIGHT
-                mutex_lock(&pmac_backlight_mutex);
-                if (pmac_backlight == bd)
-                        pmac_backlight = NULL;
-                mutex_unlock(&pmac_backlight_mutex);
-#endif
-                backlight_device_unregister(bd);
-
-                printk("aty: Backlight unloaded\n");
-        }
+        backlight_device_unregister(bd);
+        printk("aty: Backlight unloaded\n");
 }
 
 #endif /* CONFIG_FB_ATY_BACKLIGHT */
diff --git a/drivers/video/aty/radeon_backlight.c b/drivers/video/aty/radeon_backlight.c
index f94e4616788d..8c775e6a7e03 100644
--- a/drivers/video/aty/radeon_backlight.c
+++ b/drivers/video/aty/radeon_backlight.c
@@ -192,13 +192,6 @@ void radeonfb_bl_init(struct radeonfb_info *rinfo)
         bd->props->power = FB_BLANK_UNBLANK;
         backlight_update_status(bd);
 
-#ifdef CONFIG_PMAC_BACKLIGHT
-        mutex_lock(&pmac_backlight_mutex);
-        if (!pmac_backlight)
-                pmac_backlight = bd;
-        mutex_unlock(&pmac_backlight_mutex);
-#endif
-
         printk("radeonfb: Backlight initialized (%s)\n", name);
 
         return;
@@ -215,12 +208,6 @@ void radeonfb_bl_exit(struct radeonfb_info *rinfo)
         if (bd) {
                 struct radeon_bl_privdata *pdata;
 
-#ifdef CONFIG_PMAC_BACKLIGHT
-                mutex_lock(&pmac_backlight_mutex);
-                if (pmac_backlight == bd)
-                        pmac_backlight = NULL;
-                mutex_unlock(&pmac_backlight_mutex);
-#endif
                 pdata = class_get_devdata(&bd->class_dev);
                 backlight_device_unregister(bd);
                 kfree(pdata);
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]);
diff --git a/drivers/video/nvidia/nv_backlight.c b/drivers/video/nvidia/nv_backlight.c
index 2bebfeeb4f1d..0e2bc519dcab 100644
--- a/drivers/video/nvidia/nv_backlight.c
+++ b/drivers/video/nvidia/nv_backlight.c
@@ -16,11 +16,6 @@
 #include "nv_type.h"
 #include "nv_proto.h"
 
-#ifdef CONFIG_PMAC_BACKLIGHT
-#include <asm/backlight.h>
-#include <asm/machdep.h>
-#endif
-
 /* We do not have any information about which values are allowed, thus
  * we used safe values.
  */
@@ -128,13 +123,6 @@ void nvidia_bl_init(struct nvidia_par *par)
         bd->props->power = FB_BLANK_UNBLANK;
         backlight_update_status(bd);
 
-#ifdef CONFIG_PMAC_BACKLIGHT
-        mutex_lock(&pmac_backlight_mutex);
-        if (!pmac_backlight)
-                pmac_backlight = bd;
-        mutex_unlock(&pmac_backlight_mutex);
-#endif
-
         printk("nvidia: Backlight initialized (%s)\n", name);
 
         return;
@@ -148,15 +136,6 @@ void nvidia_bl_exit(struct nvidia_par *par)
         struct fb_info *info = pci_get_drvdata(par->pci_dev);
         struct backlight_device *bd = info->bl_dev;
 
-        if (bd) {
-#ifdef CONFIG_PMAC_BACKLIGHT
-                mutex_lock(&pmac_backlight_mutex);
-                if (pmac_backlight == bd)
-                        pmac_backlight = NULL;
-                mutex_unlock(&pmac_backlight_mutex);
-#endif
-                backlight_device_unregister(bd);
-
-                printk("nvidia: Backlight unloaded\n");
-        }
+        backlight_device_unregister(bd);
+        printk("nvidia: Backlight unloaded\n");
 }
diff --git a/drivers/video/riva/fbdev.c b/drivers/video/riva/fbdev.c
index ab00350907dd..3a75def01b28 100644
--- a/drivers/video/riva/fbdev.c
+++ b/drivers/video/riva/fbdev.c
@@ -371,13 +371,6 @@ static void riva_bl_init(struct riva_par *par)
         bd->props->power = FB_BLANK_UNBLANK;
         backlight_update_status(bd);
 
-#ifdef CONFIG_PMAC_BACKLIGHT
-        mutex_lock(&pmac_backlight_mutex);
-        if (!pmac_backlight)
-                pmac_backlight = bd;
-        mutex_unlock(&pmac_backlight_mutex);
-#endif
-
         printk("riva: Backlight initialized (%s)\n", name);
 
         return;
@@ -390,17 +383,8 @@ static void riva_bl_exit(struct fb_info *info)
 {
         struct backlight_device *bd = info->bl_dev;
 
-        if (bd) {
-#ifdef CONFIG_PMAC_BACKLIGHT
-                mutex_lock(&pmac_backlight_mutex);
-                if (pmac_backlight == bd)
-                        pmac_backlight = NULL;
-                mutex_unlock(&pmac_backlight_mutex);
-#endif
-                backlight_device_unregister(bd);
-
-                printk("riva: Backlight unloaded\n");
-        }
+        backlight_device_unregister(bd);
+        printk("riva: Backlight unloaded\n");
 }
 #else
 static inline void riva_bl_init(struct riva_par *par) {}