[PATCH] Rewritten backlight infrastructure for portable Apple computers

This patch contains a total rewrite of the backlight infrastructure for
portable Apple computers.  Backward compatibility is retained.  A sysfs
interface allows userland to control the brightness with more steps than
before.  Userland is allowed to upload a brightness curve for different
monitors, similar to Mac OS X.

[akpm@osdl.org: add needed exports]
Signed-off-by: Michael Hanselmann <linux-kernel@hansmi.ch>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Richard Purdie <rpurdie@rpsys.net>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

7 files changed, 637 insertions, 261 deletions

diff --git a/drivers/video/aty/Makefile b/drivers/video/aty/Makefile
index 18521397a6e3..a6cc0e9ec790 100644
--- a/drivers/video/aty/Makefile
+++ b/drivers/video/aty/Makefile
@@ -10,5 +10,6 @@ atyfb-objs			:= $(atyfb-y)
 
 radeonfb-y			:= radeon_base.o radeon_pm.o radeon_monitor.o radeon_accel.o
 radeonfb-$(CONFIG_FB_RADEON_I2C)	+= radeon_i2c.o
+radeonfb-$(CONFIG_FB_RADEON_BACKLIGHT)	+= radeon_backlight.o
 radeonfb-objs			:= $(radeonfb-y)
 
diff --git a/drivers/video/aty/aty128fb.c b/drivers/video/aty/aty128fb.c
index f7bbff4ddc6a..db878fd55fb2 100644
--- a/drivers/video/aty/aty128fb.c
+++ b/drivers/video/aty/aty128fb.c
@@ -64,6 +64,7 @@
 #include <linux/pci.h>
 #include <linux/ioport.h>
 #include <linux/console.h>
+#include <linux/backlight.h>
 #include <asm/io.h>
 
 #ifdef CONFIG_PPC_PMAC
@@ -480,16 +481,6 @@ static struct fb_ops aty128fb_ops = {
 	.fb_imageblit	= cfb_imageblit,
 };
 
-#ifdef CONFIG_PMAC_BACKLIGHT
-static int aty128_set_backlight_enable(int on, int level, void* data);
-static int aty128_set_backlight_level(int level, void* data);
-
-static struct backlight_controller aty128_backlight_controller = {
-	aty128_set_backlight_enable,
-	aty128_set_backlight_level
-};
-#endif /* CONFIG_PMAC_BACKLIGHT */
-
     /*
      * Functions to read from/write to the mmio registers
      *	- endian conversions may possibly be avoided by
@@ -1258,19 +1249,35 @@ static void aty128_set_crt_enable(struct aty128fb_par *par, int on)
 static void aty128_set_lcd_enable(struct aty128fb_par *par, int on)
 {
 	u32 reg;
+#ifdef CONFIG_FB_ATY128_BACKLIGHT
+	struct fb_info *info = pci_get_drvdata(par->pdev);
+#endif
 
 	if (on) {
 		reg = aty_ld_le32(LVDS_GEN_CNTL);
 		reg |= LVDS_ON | LVDS_EN | LVDS_BLON | LVDS_DIGION;
 		reg &= ~LVDS_DISPLAY_DIS;
 		aty_st_le32(LVDS_GEN_CNTL, reg);
-#ifdef CONFIG_PMAC_BACKLIGHT
-		aty128_set_backlight_enable(get_backlight_enable(),
-					    get_backlight_level(), par);
+#ifdef CONFIG_FB_ATY128_BACKLIGHT
+		mutex_lock(&info->bl_mutex);
+		if (info->bl_dev) {
+			down(&info->bl_dev->sem);
+			info->bl_dev->props->update_status(info->bl_dev);
+			up(&info->bl_dev->sem);
+		}
+		mutex_unlock(&info->bl_mutex);
 #endif	
 	} else {
-#ifdef CONFIG_PMAC_BACKLIGHT
-		aty128_set_backlight_enable(0, 0, par);
+#ifdef CONFIG_FB_ATY128_BACKLIGHT
+		mutex_lock(&info->bl_mutex);
+		if (info->bl_dev) {
+			down(&info->bl_dev->sem);
+			info->bl_dev->props->brightness = 0;
+			info->bl_dev->props->power = FB_BLANK_POWERDOWN;
+			info->bl_dev->props->update_status(info->bl_dev);
+			up(&info->bl_dev->sem);
+		}
+		mutex_unlock(&info->bl_mutex);
 #endif	
 		reg = aty_ld_le32(LVDS_GEN_CNTL);
 		reg |= LVDS_DISPLAY_DIS;
@@ -1691,6 +1698,184 @@ static int __init aty128fb_setup(char *options)
 }
 #endif  /*  MODULE  */
 
+/* Backlight */
+#ifdef CONFIG_FB_ATY128_BACKLIGHT
+#define MAX_LEVEL 0xFF
+
+static struct backlight_properties aty128_bl_data;
+
+static int aty128_bl_get_level_brightness(struct aty128fb_par *par,
+		int level)
+{
+	struct fb_info *info = pci_get_drvdata(par->pdev);
+	int atylevel;
+
+	/* Get and convert the value */
+	mutex_lock(&info->bl_mutex);
+	atylevel = MAX_LEVEL -
+		(info->bl_curve[level] * FB_BACKLIGHT_MAX / MAX_LEVEL);
+	mutex_unlock(&info->bl_mutex);
+
+	if (atylevel < 0)
+		atylevel = 0;
+	else if (atylevel > MAX_LEVEL)
+		atylevel = MAX_LEVEL;
+
+	return atylevel;
+}
+
+/* We turn off the LCD completely instead of just dimming the backlight.
+ * This provides greater power saving and the display is useless without
+ * backlight anyway
+ */
+#define BACKLIGHT_LVDS_OFF
+/* That one prevents proper CRT output with LCD off */
+#undef BACKLIGHT_DAC_OFF
+
+static int aty128_bl_update_status(struct backlight_device *bd)
+{
+	struct aty128fb_par *par = class_get_devdata(&bd->class_dev);
+	unsigned int reg = aty_ld_le32(LVDS_GEN_CNTL);
+	int level;
+
+	if (bd->props->power != FB_BLANK_UNBLANK ||
+	    bd->props->fb_blank != FB_BLANK_UNBLANK ||
+	    !par->lcd_on)
+		level = 0;
+	else
+		level = bd->props->brightness;
+
+	reg |= LVDS_BL_MOD_EN | LVDS_BLON;
+	if (level > 0) {
+		reg |= LVDS_DIGION;
+		if (!(reg & LVDS_ON)) {
+			reg &= ~LVDS_BLON;
+			aty_st_le32(LVDS_GEN_CNTL, reg);
+			aty_ld_le32(LVDS_GEN_CNTL);
+			mdelay(10);
+			reg |= LVDS_BLON;
+			aty_st_le32(LVDS_GEN_CNTL, reg);
+		}
+		reg &= ~LVDS_BL_MOD_LEVEL_MASK;
+		reg |= (aty128_bl_get_level_brightness(par, level) << LVDS_BL_MOD_LEVEL_SHIFT);
+#ifdef BACKLIGHT_LVDS_OFF
+		reg |= LVDS_ON | LVDS_EN;
+		reg &= ~LVDS_DISPLAY_DIS;
+#endif
+		aty_st_le32(LVDS_GEN_CNTL, reg);
+#ifdef BACKLIGHT_DAC_OFF
+		aty_st_le32(DAC_CNTL, aty_ld_le32(DAC_CNTL) & (~DAC_PDWN));
+#endif
+	} else {
+		reg &= ~LVDS_BL_MOD_LEVEL_MASK;
+		reg |= (aty128_bl_get_level_brightness(par, 0) << LVDS_BL_MOD_LEVEL_SHIFT);
+#ifdef BACKLIGHT_LVDS_OFF
+		reg |= LVDS_DISPLAY_DIS;
+		aty_st_le32(LVDS_GEN_CNTL, reg);
+		aty_ld_le32(LVDS_GEN_CNTL);
+		udelay(10);
+		reg &= ~(LVDS_ON | LVDS_EN | LVDS_BLON | LVDS_DIGION);
+#endif
+		aty_st_le32(LVDS_GEN_CNTL, reg);
+#ifdef BACKLIGHT_DAC_OFF
+		aty_st_le32(DAC_CNTL, aty_ld_le32(DAC_CNTL) | DAC_PDWN);
+#endif
+	}
+
+	return 0;
+}
+
+static int aty128_bl_get_brightness(struct backlight_device *bd)
+{
+	return bd->props->brightness;
+}
+
+static struct backlight_properties aty128_bl_data = {
+	.owner		= THIS_MODULE,
+	.get_brightness	= aty128_bl_get_brightness,
+	.update_status	= aty128_bl_update_status,
+	.max_brightness	= (FB_BACKLIGHT_LEVELS - 1),
+};
+
+static void aty128_bl_init(struct aty128fb_par *par)
+{
+	struct fb_info *info = pci_get_drvdata(par->pdev);
+	struct backlight_device *bd;
+	char name[12];
+
+	/* Could be extended to Rage128Pro LVDS output too */
+	if (par->chip_gen != rage_M3)
+		return;
+
+#ifdef CONFIG_PMAC_BACKLIGHT
+	if (!pmac_has_backlight_type("ati"))
+		return;
+#endif
+
+	snprintf(name, sizeof(name), "aty128bl%d", info->node);
+
+	bd = backlight_device_register(name, par, &aty128_bl_data);
+	if (IS_ERR(bd)) {
+		info->bl_dev = NULL;
+		printk("aty128: Backlight registration failed\n");
+		goto error;
+	}
+
+	mutex_lock(&info->bl_mutex);
+	info->bl_dev = bd;
+	fb_bl_default_curve(info, 0,
+		 63 * FB_BACKLIGHT_MAX / MAX_LEVEL,
+		219 * FB_BACKLIGHT_MAX / MAX_LEVEL);
+	mutex_unlock(&info->bl_mutex);
+
+	up(&bd->sem);
+	bd->props->brightness = aty128_bl_data.max_brightness;
+	bd->props->power = FB_BLANK_UNBLANK;
+	bd->props->update_status(bd);
+	down(&bd->sem);
+
+#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;
+
+error:
+	return;
+}
+
+static void aty128_bl_exit(struct aty128fb_par *par)
+{
+	struct fb_info *info = pci_get_drvdata(par->pdev);
+
+#ifdef CONFIG_PMAC_BACKLIGHT
+	mutex_lock(&pmac_backlight_mutex);
+#endif
+
+	mutex_lock(&info->bl_mutex);
+	if (info->bl_dev) {
+#ifdef CONFIG_PMAC_BACKLIGHT
+		if (pmac_backlight == info->bl_dev)
+			pmac_backlight = NULL;
+#endif
+
+		backlight_device_unregister(info->bl_dev);
+		info->bl_dev = NULL;
+
+		printk("aty128: Backlight unloaded\n");
+	}
+	mutex_unlock(&info->bl_mutex);
+
+#ifdef CONFIG_PMAC_BACKLIGHT
+	mutex_unlock(&pmac_backlight_mutex);
+#endif
+}
+#endif /* CONFIG_FB_ATY128_BACKLIGHT */
 
 /*
  *  Initialisation
@@ -1835,17 +2020,15 @@ static int __init aty128_init(struct pci_dev *pdev, const struct pci_device_id *
 	if (register_framebuffer(info) < 0)
 		return 0;
 
-#ifdef CONFIG_PMAC_BACKLIGHT
-	/* Could be extended to Rage128Pro LVDS output too */
-	if (par->chip_gen == rage_M3)
-		register_backlight_controller(&aty128_backlight_controller, par, "ati");
-#endif /* CONFIG_PMAC_BACKLIGHT */
-
 	par->pm_reg = pci_find_capability(pdev, PCI_CAP_ID_PM);
 	par->pdev = pdev;
 	par->asleep = 0;
 	par->lock_blank = 0;
-	
+
+#ifdef CONFIG_FB_ATY128_BACKLIGHT
+	aty128_bl_init(par);
+#endif
+
 	printk(KERN_INFO "fb%d: %s frame buffer device on %s\n",
 	       info->node, info->fix.id, video_card);
 
@@ -1981,6 +2164,10 @@ static void __devexit aty128_remove(struct pci_dev *pdev)
 
 	par = info->par;
 
+#ifdef CONFIG_FB_ATY128_BACKLIGHT
+	aty128_bl_exit(par);
+#endif
+
 	unregister_framebuffer(info);
 #ifdef CONFIG_MTRR
 	if (par->mtrr.vram_valid)
@@ -2011,10 +2198,14 @@ static int aty128fb_blank(int blank, struct fb_info *fb)
 	if (par->lock_blank || par->asleep)
 		return 0;
 
-#ifdef CONFIG_PMAC_BACKLIGHT
-	if (machine_is(powermac) && blank)
-		set_backlight_enable(0);
-#endif /* CONFIG_PMAC_BACKLIGHT */
+#ifdef CONFIG_FB_ATY128_BACKLIGHT
+	if (machine_is(powermac) && blank) {
+		down(&fb->bl_dev->sem);
+		fb->bl_dev->props->power = FB_BLANK_POWERDOWN;
+		fb->bl_dev->props->update_status(fb->bl_dev);
+		up(&fb->bl_dev->sem);
+	}
+#endif
 
 	if (blank & FB_BLANK_VSYNC_SUSPEND)
 		state |= 2;
@@ -2029,10 +2220,14 @@ static int aty128fb_blank(int blank, struct fb_info *fb)
 		aty128_set_crt_enable(par, par->crt_on && !blank);
 		aty128_set_lcd_enable(par, par->lcd_on && !blank);
 	}
-#ifdef CONFIG_PMAC_BACKLIGHT
-	if (machine_is(powermac) && !blank)
-		set_backlight_enable(1);
-#endif /* CONFIG_PMAC_BACKLIGHT */
+#ifdef CONFIG_FB_ATY128_BACKLIGHT
+	if (machine_is(powermac) && !blank) {
+		down(&fb->bl_dev->sem);
+		fb->bl_dev->props->power = FB_BLANK_UNBLANK;
+		fb->bl_dev->props->update_status(fb->bl_dev);
+		up(&fb->bl_dev->sem);
+	}
+#endif
 	return 0;
 }
 
@@ -2138,73 +2333,6 @@ static int aty128fb_ioctl(struct fb_info *info, u_int cmd, u_long arg)
 	return -EINVAL;
 }
 
-#ifdef CONFIG_PMAC_BACKLIGHT
-static int backlight_conv[] = {
-	0xff, 0xc0, 0xb5, 0xaa, 0x9f, 0x94, 0x89, 0x7e,
-	0x73, 0x68, 0x5d, 0x52, 0x47, 0x3c, 0x31, 0x24
-};
-
-/* We turn off the LCD completely instead of just dimming the backlight.
- * This provides greater power saving and the display is useless without
- * backlight anyway
- */
-#define BACKLIGHT_LVDS_OFF
-/* That one prevents proper CRT output with LCD off */
-#undef BACKLIGHT_DAC_OFF
-
-static int aty128_set_backlight_enable(int on, int level, void *data)
-{
-	struct aty128fb_par *par = data;
-	unsigned int reg = aty_ld_le32(LVDS_GEN_CNTL);
-
-	if (!par->lcd_on)
-		on = 0;
-	reg |= LVDS_BL_MOD_EN | LVDS_BLON;
-	if (on && level > BACKLIGHT_OFF) {
-		reg |= LVDS_DIGION;
-		if (!(reg & LVDS_ON)) {
-			reg &= ~LVDS_BLON;
-			aty_st_le32(LVDS_GEN_CNTL, reg);
-			(void)aty_ld_le32(LVDS_GEN_CNTL);
-			mdelay(10);
-			reg |= LVDS_BLON;
-			aty_st_le32(LVDS_GEN_CNTL, reg);
-		}
-		reg &= ~LVDS_BL_MOD_LEVEL_MASK;
-		reg |= (backlight_conv[level] << LVDS_BL_MOD_LEVEL_SHIFT);
-#ifdef BACKLIGHT_LVDS_OFF
-		reg |= LVDS_ON | LVDS_EN;
-		reg &= ~LVDS_DISPLAY_DIS;
-#endif
-		aty_st_le32(LVDS_GEN_CNTL, reg);
-#ifdef BACKLIGHT_DAC_OFF
-		aty_st_le32(DAC_CNTL, aty_ld_le32(DAC_CNTL) & (~DAC_PDWN));
-#endif		
-	} else {
-		reg &= ~LVDS_BL_MOD_LEVEL_MASK;
-		reg |= (backlight_conv[0] << LVDS_BL_MOD_LEVEL_SHIFT);
-#ifdef BACKLIGHT_LVDS_OFF
-		reg |= LVDS_DISPLAY_DIS;
-		aty_st_le32(LVDS_GEN_CNTL, reg);
-		(void)aty_ld_le32(LVDS_GEN_CNTL);
-		udelay(10);
-		reg &= ~(LVDS_ON | LVDS_EN | LVDS_BLON | LVDS_DIGION);
-#endif		
-		aty_st_le32(LVDS_GEN_CNTL, reg);
-#ifdef BACKLIGHT_DAC_OFF
-		aty_st_le32(DAC_CNTL, aty_ld_le32(DAC_CNTL) | DAC_PDWN);
-#endif		
-	}
-
-	return 0;
-}
-
-static int aty128_set_backlight_level(int level, void* data)
-{
-	return aty128_set_backlight_enable(1, level, data);
-}
-#endif /* CONFIG_PMAC_BACKLIGHT */
-
 #if 0
     /*
      *  Accelerated functions
diff --git a/drivers/video/aty/atyfb.h b/drivers/video/aty/atyfb.h
index e9b7a64c1ac4..43d2cb58af87 100644
--- a/drivers/video/aty/atyfb.h
+++ b/drivers/video/aty/atyfb.h
@@ -151,6 +151,7 @@ struct atyfb_par {
 	int lock_blank;
 	unsigned long res_start;
 	unsigned long res_size;
+	struct pci_dev *pdev;
 #ifdef __sparc__
 	struct pci_mmap_map *mmap_map;
 	u8 mmaped;
diff --git a/drivers/video/aty/atyfb_base.c b/drivers/video/aty/atyfb_base.c
index c054bb28b1c4..c5185f7cf4ba 100644
--- a/drivers/video/aty/atyfb_base.c
+++ b/drivers/video/aty/atyfb_base.c
@@ -66,6 +66,7 @@
 #include <linux/interrupt.h>
 #include <linux/spinlock.h>
 #include <linux/wait.h>
+#include <linux/backlight.h>
 
 #include <asm/io.h>
 #include <asm/uaccess.h>
@@ -2115,45 +2116,142 @@ static int atyfb_pci_resume(struct pci_dev *pdev)
 
 #endif /*  defined(CONFIG_PM) && defined(CONFIG_PCI) */
 
-#ifdef CONFIG_PMAC_BACKLIGHT
+/* Backlight */
+#ifdef CONFIG_FB_ATY_BACKLIGHT
+#define MAX_LEVEL 0xFF
 
-    /*
-     *   LCD backlight control
-     */
+static struct backlight_properties aty_bl_data;
 
-static int backlight_conv[] = {
-	0x00, 0x3f, 0x4c, 0x59, 0x66, 0x73, 0x80, 0x8d,
-	0x9a, 0xa7, 0xb4, 0xc1, 0xcf, 0xdc, 0xe9, 0xff
-};
+static int aty_bl_get_level_brightness(struct atyfb_par *par, int level)
+{
+	struct fb_info *info = pci_get_drvdata(par->pdev);
+	int atylevel;
+
+	/* Get and convert the value */
+	mutex_lock(&info->bl_mutex);
+	atylevel = info->bl_curve[level] * FB_BACKLIGHT_MAX / MAX_LEVEL;
+	mutex_unlock(&info->bl_mutex);
+
+	if (atylevel < 0)
+		atylevel = 0;
+	else if (atylevel > MAX_LEVEL)
+		atylevel = MAX_LEVEL;
 
-static int aty_set_backlight_enable(int on, int level, void *data)
+	return atylevel;
+}
+
+static int aty_bl_update_status(struct backlight_device *bd)
 {
-	struct fb_info *info = (struct fb_info *) data;
-	struct atyfb_par *par = (struct atyfb_par *) info->par;
+	struct atyfb_par *par = class_get_devdata(&bd->class_dev);
 	unsigned int reg = aty_ld_lcd(LCD_MISC_CNTL, par);
+	int level;
+
+	if (bd->props->power != FB_BLANK_UNBLANK ||
+	    bd->props->fb_blank != FB_BLANK_UNBLANK)
+		level = 0;
+	else
+		level = bd->props->brightness;
 
 	reg |= (BLMOD_EN | BIASMOD_EN);
-	if (on && level > BACKLIGHT_OFF) {
+	if (level > 0) {
 		reg &= ~BIAS_MOD_LEVEL_MASK;
-		reg |= (backlight_conv[level] << BIAS_MOD_LEVEL_SHIFT);
+		reg |= (aty_bl_get_level_brightness(par, level) << BIAS_MOD_LEVEL_SHIFT);
 	} else {
 		reg &= ~BIAS_MOD_LEVEL_MASK;
-		reg |= (backlight_conv[0] << BIAS_MOD_LEVEL_SHIFT);
+		reg |= (aty_bl_get_level_brightness(par, 0) << BIAS_MOD_LEVEL_SHIFT);
 	}
 	aty_st_lcd(LCD_MISC_CNTL, reg, par);
+
 	return 0;
 }
 
-static int aty_set_backlight_level(int level, void *data)
+static int aty_bl_get_brightness(struct backlight_device *bd)
 {
-	return aty_set_backlight_enable(1, level, data);
+	return bd->props->brightness;
 }
 
-static struct backlight_controller aty_backlight_controller = {
-	aty_set_backlight_enable,
-	aty_set_backlight_level
+static struct backlight_properties aty_bl_data = {
+	.owner	  = THIS_MODULE,
+	.get_brightness = aty_bl_get_brightness,
+	.update_status	= aty_bl_update_status,
+	.max_brightness = (FB_BACKLIGHT_LEVELS - 1),
 };
-#endif /* CONFIG_PMAC_BACKLIGHT */
+
+static void aty_bl_init(struct atyfb_par *par)
+{
+	struct fb_info *info = pci_get_drvdata(par->pdev);
+	struct backlight_device *bd;
+	char name[12];
+
+#ifdef CONFIG_PMAC_BACKLIGHT
+	if (!pmac_has_backlight_type("ati"))
+		return;
+#endif
+
+	snprintf(name, sizeof(name), "atybl%d", info->node);
+
+	bd = backlight_device_register(name, par, &aty_bl_data);
+	if (IS_ERR(bd)) {
+		info->bl_dev = NULL;
+		printk("aty: Backlight registration failed\n");
+		goto error;
+	}
+
+	mutex_lock(&info->bl_mutex);
+	info->bl_dev = bd;
+	fb_bl_default_curve(info, 0,
+		0x3F * FB_BACKLIGHT_MAX / MAX_LEVEL,
+		0xFF * FB_BACKLIGHT_MAX / MAX_LEVEL);
+	mutex_unlock(&info->bl_mutex);
+
+	up(&bd->sem);
+	bd->props->brightness = aty_bl_data.max_brightness;
+	bd->props->power = FB_BLANK_UNBLANK;
+	bd->props->update_status(bd);
+	down(&bd->sem);
+
+#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;
+
+error:
+	return;
+}
+
+static void aty_bl_exit(struct atyfb_par *par)
+{
+	struct fb_info *info = pci_get_drvdata(par->pdev);
+
+#ifdef CONFIG_PMAC_BACKLIGHT
+	mutex_lock(&pmac_backlight_mutex);
+#endif
+
+	mutex_lock(&info->bl_mutex);
+	if (info->bl_dev) {
+#ifdef CONFIG_PMAC_BACKLIGHT
+		if (pmac_backlight == info->bl_dev)
+			pmac_backlight = NULL;
+#endif
+
+		backlight_device_unregister(info->bl_dev);
+
+		printk("aty: Backlight unloaded\n");
+	}
+	mutex_unlock(&info->bl_mutex);
+
+#ifdef CONFIG_PMAC_BACKLIGHT
+	mutex_unlock(&pmac_backlight_mutex);
+#endif
+}
+
+#endif /* CONFIG_FB_ATY_BACKLIGHT */
 
 static void __init aty_calc_mem_refresh(struct atyfb_par *par, int xclk)
 {
@@ -2513,9 +2611,13 @@ static int __init aty_init(struct fb_info *info, const char *name)
 		/* these bits let the 101 powerbook wake up from sleep -- paulus */
 		aty_st_lcd(POWER_MANAGEMENT, aty_ld_lcd(POWER_MANAGEMENT, par)
 			   | (USE_F32KHZ | TRISTATE_MEM_EN), par);
-	} else if (M64_HAS(MOBIL_BUS))
-		register_backlight_controller(&aty_backlight_controller, info, "ati");
-#endif /* CONFIG_PMAC_BACKLIGHT */
+	} else
+#endif
+	if (M64_HAS(MOBIL_BUS)) {
+#ifdef CONFIG_FB_ATY_BACKLIGHT
+		aty_bl_init (par);
+#endif
+	}
 
 	memset(&var, 0, sizeof(var));
 #ifdef CONFIG_PPC
@@ -2674,8 +2776,16 @@ static int atyfb_blank(int blank, struct fb_info *info)
 		return 0;
 
 #ifdef CONFIG_PMAC_BACKLIGHT
-	if (machine_is(powermac) && blank > FB_BLANK_NORMAL)
-		set_backlight_enable(0);
+	if (machine_is(powermac) && blank > FB_BLANK_NORMAL) {
+		mutex_lock(&info->bl_mutex);
+		if (info->bl_dev) {
+			down(&info->bl_dev->sem);
+			info->bl_dev->props->power = FB_BLANK_POWERDOWN;
+			info->bl_dev->props->update_status(info->bl_dev);
+			up(&info->bl_dev->sem);
+		}
+		mutex_unlock(&info->bl_mutex);
+	}
 #elif defined(CONFIG_FB_ATY_GENERIC_LCD)
 	if (par->lcd_table && blank > FB_BLANK_NORMAL &&
 	    (aty_ld_lcd(LCD_GEN_CNTL, par) & LCD_ON)) {
@@ -2706,8 +2816,16 @@ static int atyfb_blank(int blank, struct fb_info *info)
 	aty_st_le32(CRTC_GEN_CNTL, gen_cntl, par);
 
 #ifdef CONFIG_PMAC_BACKLIGHT
-	if (machine_is(powermac) && blank <= FB_BLANK_NORMAL)
-		set_backlight_enable(1);
+	if (machine_is(powermac) && blank <= FB_BLANK_NORMAL) {
+		mutex_lock(&info->bl_mutex);
+		if (info->bl_dev) {
+			down(&info->bl_dev->sem);
+			info->bl_dev->props->power = FB_BLANK_UNBLANK;
+			info->bl_dev->props->update_status(info->bl_dev);
+			up(&info->bl_dev->sem);
+		}
+		mutex_unlock(&info->bl_mutex);
+	}
 #elif defined(CONFIG_FB_ATY_GENERIC_LCD)
 	if (par->lcd_table && blank <= FB_BLANK_NORMAL &&
 	    (aty_ld_lcd(LCD_GEN_CNTL, par) & LCD_ON)) {
@@ -3440,6 +3558,7 @@ static int __devinit atyfb_pci_probe(struct pci_dev *pdev, const struct pci_devi
 	par->res_start = res_start;
 	par->res_size = res_size;
 	par->irq = pdev->irq;
+	par->pdev = pdev;
 
 	/* Setup "info" structure */
 #ifdef __sparc__
@@ -3571,6 +3690,11 @@ static void __devexit atyfb_remove(struct fb_info *info)
 	aty_set_crtc(par, &saved_crtc);
 	par->pll_ops->set_pll(info, &saved_pll);
 
+#ifdef CONFIG_FB_ATY_BACKLIGHT
+	if (M64_HAS(MOBIL_BUS))
+		aty_bl_exit(par);
+#endif
+
 	unregister_framebuffer(info);
 
 #ifdef CONFIG_MTRR
diff --git a/drivers/video/aty/radeon_backlight.c b/drivers/video/aty/radeon_backlight.c
new file mode 100644
index 000000000000..7de66b855d4e
--- /dev/null
+++ b/drivers/video/aty/radeon_backlight.c
@@ -0,0 +1,247 @@
+/*
+ * Backlight code for ATI Radeon based graphic cards
+ *
+ * Copyright (c) 2000 Ani Joshi <ajoshi@kernel.crashing.org>
+ * Copyright (c) 2003 Benjamin Herrenschmidt <benh@kernel.crashing.org>
+ * Copyright (c) 2006 Michael Hanselmann <linux-kernel@hansmi.ch>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "radeonfb.h"
+#include <linux/backlight.h>
+
+#ifdef CONFIG_PMAC_BACKLIGHT
+#include <asm/backlight.h>
+#endif
+
+#define MAX_RADEON_LEVEL 0xFF
+
+static struct backlight_properties radeon_bl_data;
+
+struct radeon_bl_privdata {
+	struct radeonfb_info *rinfo;
+	uint8_t negative;
+};
+
+static int radeon_bl_get_level_brightness(struct radeon_bl_privdata *pdata,
+		int level)
+{
+	struct fb_info *info = pdata->rinfo->info;
+	int rlevel;
+
+	mutex_lock(&info->bl_mutex);
+
+	/* Get and convert the value */
+	rlevel = pdata->rinfo->info->bl_curve[level] *
+		 FB_BACKLIGHT_MAX / MAX_RADEON_LEVEL;
+
+	mutex_unlock(&info->bl_mutex);
+
+	if (pdata->negative)
+		rlevel = MAX_RADEON_LEVEL - rlevel;
+
+	if (rlevel < 0)
+		rlevel = 0;
+	else if (rlevel > MAX_RADEON_LEVEL)
+		rlevel = MAX_RADEON_LEVEL;
+
+	return rlevel;
+}
+
+static int radeon_bl_update_status(struct backlight_device *bd)
+{
+	struct radeon_bl_privdata *pdata = class_get_devdata(&bd->class_dev);
+	struct radeonfb_info *rinfo = pdata->rinfo;
+	u32 lvds_gen_cntl, tmpPixclksCntl;
+	int level;
+
+	if (rinfo->mon1_type != MT_LCD)
+		return 0;
+
+	/* We turn off the LCD completely instead of just dimming the
+	 * backlight. This provides some greater power saving and the display
+	 * is useless without backlight anyway.
+	 */
+        if (bd->props->power != FB_BLANK_UNBLANK ||
+	    bd->props->fb_blank != FB_BLANK_UNBLANK)
+		level = 0;
+	else
+		level = bd->props->brightness;
+
+	del_timer_sync(&rinfo->lvds_timer);
+	radeon_engine_idle();
+
+	lvds_gen_cntl = INREG(LVDS_GEN_CNTL);
+	if (level > 0) {
+		lvds_gen_cntl &= ~LVDS_DISPLAY_DIS;
+		if (!(lvds_gen_cntl & LVDS_BLON) || !(lvds_gen_cntl & LVDS_ON)) {
+			lvds_gen_cntl |= (rinfo->init_state.lvds_gen_cntl & LVDS_DIGON);
+			lvds_gen_cntl |= LVDS_BLON | LVDS_EN;
+			OUTREG(LVDS_GEN_CNTL, lvds_gen_cntl);
+			lvds_gen_cntl &= ~LVDS_BL_MOD_LEVEL_MASK;
+			lvds_gen_cntl |=
+				(radeon_bl_get_level_brightness(pdata, level) <<
+				 LVDS_BL_MOD_LEVEL_SHIFT);
+			lvds_gen_cntl |= LVDS_ON;
+			lvds_gen_cntl |= (rinfo->init_state.lvds_gen_cntl & LVDS_BL_MOD_EN);
+			rinfo->pending_lvds_gen_cntl = lvds_gen_cntl;
+			mod_timer(&rinfo->lvds_timer,
+				  jiffies + msecs_to_jiffies(rinfo->panel_info.pwr_delay));
+		} else {
+			lvds_gen_cntl &= ~LVDS_BL_MOD_LEVEL_MASK;
+			lvds_gen_cntl |=
+				(radeon_bl_get_level_brightness(pdata, level) <<
+				 LVDS_BL_MOD_LEVEL_SHIFT);
+			OUTREG(LVDS_GEN_CNTL, lvds_gen_cntl);
+		}
+		rinfo->init_state.lvds_gen_cntl &= ~LVDS_STATE_MASK;
+		rinfo->init_state.lvds_gen_cntl |= rinfo->pending_lvds_gen_cntl
+			& LVDS_STATE_MASK;
+	} else {
+		/* Asic bug, when turning off LVDS_ON, we have to make sure
+		   RADEON_PIXCLK_LVDS_ALWAYS_ON bit is off
+		*/
+		tmpPixclksCntl = INPLL(PIXCLKS_CNTL);
+		if (rinfo->is_mobility || rinfo->is_IGP)
+			OUTPLLP(PIXCLKS_CNTL, 0, ~PIXCLK_LVDS_ALWAYS_ONb);
+		lvds_gen_cntl &= ~(LVDS_BL_MOD_LEVEL_MASK | LVDS_BL_MOD_EN);
+		lvds_gen_cntl |= (radeon_bl_get_level_brightness(pdata, 0) <<
+				  LVDS_BL_MOD_LEVEL_SHIFT);
+		lvds_gen_cntl |= LVDS_DISPLAY_DIS;
+		OUTREG(LVDS_GEN_CNTL, lvds_gen_cntl);
+		udelay(100);
+		lvds_gen_cntl &= ~(LVDS_ON | LVDS_EN);
+		OUTREG(LVDS_GEN_CNTL, lvds_gen_cntl);
+		lvds_gen_cntl &= ~(LVDS_DIGON);
+		rinfo->pending_lvds_gen_cntl = lvds_gen_cntl;
+		mod_timer(&rinfo->lvds_timer,
+			  jiffies + msecs_to_jiffies(rinfo->panel_info.pwr_delay));
+		if (rinfo->is_mobility || rinfo->is_IGP)
+			OUTPLL(PIXCLKS_CNTL, tmpPixclksCntl);
+	}
+	rinfo->init_state.lvds_gen_cntl &= ~LVDS_STATE_MASK;
+	rinfo->init_state.lvds_gen_cntl |= (lvds_gen_cntl & LVDS_STATE_MASK);
+
+	return 0;
+}
+
+static int radeon_bl_get_brightness(struct backlight_device *bd)
+{
+	return bd->props->brightness;
+}
+
+static struct backlight_properties radeon_bl_data = {
+	.owner		= THIS_MODULE,
+	.get_brightness = radeon_bl_get_brightness,
+	.update_status	= radeon_bl_update_status,
+	.max_brightness = (FB_BACKLIGHT_LEVELS - 1),
+};
+
+void radeonfb_bl_init(struct radeonfb_info *rinfo)
+{
+	struct backlight_device *bd;
+	struct radeon_bl_privdata *pdata;
+	char name[12];
+
+	if (rinfo->mon1_type != MT_LCD)
+		return;
+
+#ifdef CONFIG_PMAC_BACKLIGHT
+	if (!pmac_has_backlight_type("ati") &&
+	    !pmac_has_backlight_type("mnca"))
+		return;
+#endif
+
+	pdata = kmalloc(sizeof(struct radeon_bl_privdata), GFP_KERNEL);
+	if (!pdata) {
+		printk("radeonfb: Memory allocation failed\n");
+		goto error;
+	}
+
+	snprintf(name, sizeof(name), "radeonbl%d", rinfo->info->node);
+
+	bd = backlight_device_register(name, pdata, &radeon_bl_data);
+	if (IS_ERR(bd)) {
+		rinfo->info->bl_dev = NULL;
+		printk("radeonfb: Backlight registration failed\n");
+		goto error;
+	}
+
+	pdata->rinfo = rinfo;
+
+	/* Pardon me for that hack... maybe some day we can figure out in what
+	 * direction backlight should work on a given panel?
+	 */
+	pdata->negative =
+		(rinfo->family != CHIP_FAMILY_RV200 &&
+		 rinfo->family != CHIP_FAMILY_RV250 &&
+		 rinfo->family != CHIP_FAMILY_RV280 &&
+		 rinfo->family != CHIP_FAMILY_RV350);
+
+#ifdef CONFIG_PMAC_BACKLIGHT
+	pdata->negative = pdata->negative ||
+		machine_is_compatible("PowerBook4,3") ||
+		machine_is_compatible("PowerBook6,3") ||
+		machine_is_compatible("PowerBook6,5");
+#endif
+
+	mutex_lock(&rinfo->info->bl_mutex);
+	rinfo->info->bl_dev = bd;
+	fb_bl_default_curve(rinfo->info, 0,
+		 63 * FB_BACKLIGHT_MAX / MAX_RADEON_LEVEL,
+		217 * FB_BACKLIGHT_MAX / MAX_RADEON_LEVEL);
+	mutex_unlock(&rinfo->info->bl_mutex);
+
+	up(&bd->sem);
+	bd->props->brightness = radeon_bl_data.max_brightness;
+	bd->props->power = FB_BLANK_UNBLANK;
+	bd->props->update_status(bd);
+	down(&bd->sem);
+
+#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;
+
+error:
+	kfree(pdata);
+	return;
+}
+
+void radeonfb_bl_exit(struct radeonfb_info *rinfo)
+{
+#ifdef CONFIG_PMAC_BACKLIGHT
+	mutex_lock(&pmac_backlight_mutex);
+#endif
+
+	mutex_lock(&rinfo->info->bl_mutex);
+	if (rinfo->info->bl_dev) {
+		struct radeon_bl_privdata *pdata;
+
+#ifdef CONFIG_PMAC_BACKLIGHT
+		if (pmac_backlight == rinfo->info->bl_dev)
+			pmac_backlight = NULL;
+#endif
+
+		pdata = class_get_devdata(&rinfo->info->bl_dev->class_dev);
+		backlight_device_unregister(rinfo->info->bl_dev);
+		kfree(pdata);
+		rinfo->info->bl_dev = NULL;
+
+		printk("radeonfb: Backlight unloaded\n");
+	}
+	mutex_unlock(&rinfo->info->bl_mutex);
+
+#ifdef CONFIG_PMAC_BACKLIGHT
+	mutex_unlock(&pmac_backlight_mutex);
+#endif
+}
diff --git a/drivers/video/aty/radeon_base.c b/drivers/video/aty/radeon_base.c
index 387a18a47ac2..c5ecbb02e01d 100644
--- a/drivers/video/aty/radeon_base.c
+++ b/drivers/video/aty/radeon_base.c
@@ -78,10 +78,6 @@
 #include <asm/pci-bridge.h>
 #include "../macmodes.h"
 
-#ifdef CONFIG_PMAC_BACKLIGHT
-#include <asm/backlight.h>
-#endif
-
 #ifdef CONFIG_BOOTX_TEXT
 #include <asm/btext.h>
 #endif
@@ -277,20 +273,6 @@ static int nomtrr = 0;
  * prototypes
  */
 
-
-#ifdef CONFIG_PPC_OF
-
-#ifdef CONFIG_PMAC_BACKLIGHT
-static int radeon_set_backlight_enable(int on, int level, void *data);
-static int radeon_set_backlight_level(int level, void *data);
-static struct backlight_controller radeon_backlight_controller = {
-	radeon_set_backlight_enable,
-	radeon_set_backlight_level
-};
-#endif /* CONFIG_PMAC_BACKLIGHT */
-
-#endif /* CONFIG_PPC_OF */
-
 static void radeon_unmap_ROM(struct radeonfb_info *rinfo, struct pci_dev *dev)
 {
 	if (!rinfo->bios_seg)
@@ -1913,116 +1895,6 @@ static int __devinit radeon_set_fbinfo (struct radeonfb_info *rinfo)
         return 0;
 }
 
-
-#ifdef CONFIG_PMAC_BACKLIGHT
-
-/* TODO: Dbl check these tables, we don't go up to full ON backlight
- * in these, possibly because we noticed MacOS doesn't, but I'd prefer
- * having some more official numbers from ATI
- */
-static int backlight_conv_m6[] = {
-	0xff, 0xc0, 0xb5, 0xaa, 0x9f, 0x94, 0x89, 0x7e,
-	0x73, 0x68, 0x5d, 0x52, 0x47, 0x3c, 0x31, 0x24
-};
-static int backlight_conv_m7[] = {
-	0x00, 0x3f, 0x4a, 0x55, 0x60, 0x6b, 0x76, 0x81,
-	0x8c, 0x97, 0xa2, 0xad, 0xb8, 0xc3, 0xce, 0xd9
-};
-
-#define BACKLIGHT_LVDS_OFF
-#undef BACKLIGHT_DAC_OFF
-
-/* We turn off the LCD completely instead of just dimming the backlight.
- * This provides some greater power saving and the display is useless
- * without backlight anyway.
- */
-static int radeon_set_backlight_enable(int on, int level, void *data)
-{
-	struct radeonfb_info *rinfo = (struct radeonfb_info *)data;
-	u32 lvds_gen_cntl, tmpPixclksCntl;
-	int* conv_table;
-
-	if (rinfo->mon1_type != MT_LCD)
-		return 0;
-
-	/* Pardon me for that hack... maybe some day we can figure
-	 * out in what direction backlight should work on a given
-	 * panel ?
-	 */
-	if ((rinfo->family == CHIP_FAMILY_RV200 ||
-	     rinfo->family == CHIP_FAMILY_RV250 ||
-	     rinfo->family == CHIP_FAMILY_RV280 ||
-	     rinfo->family == CHIP_FAMILY_RV350) &&
-	    !machine_is_compatible("PowerBook4,3") &&
-	    !machine_is_compatible("PowerBook6,3") &&
-	    !machine_is_compatible("PowerBook6,5"))
-		conv_table = backlight_conv_m7;
-	else
-		conv_table = backlight_conv_m6;
-
-	del_timer_sync(&rinfo->lvds_timer);
-	radeon_engine_idle();
-
-	lvds_gen_cntl = INREG(LVDS_GEN_CNTL);
-	if (on && (level > BACKLIGHT_OFF)) {
-		lvds_gen_cntl &= ~LVDS_DISPLAY_DIS;
-		if (!(lvds_gen_cntl & LVDS_BLON) || !(lvds_gen_cntl & LVDS_ON)) {
-			lvds_gen_cntl |= (rinfo->init_state.lvds_gen_cntl & LVDS_DIGON);
-			lvds_gen_cntl |= LVDS_BLON | LVDS_EN;
-			OUTREG(LVDS_GEN_CNTL, lvds_gen_cntl);
-			lvds_gen_cntl &= ~LVDS_BL_MOD_LEVEL_MASK;
-			lvds_gen_cntl |= (conv_table[level] <<
-					  LVDS_BL_MOD_LEVEL_SHIFT);
-			lvds_gen_cntl |= LVDS_ON;
-			lvds_gen_cntl |= (rinfo->init_state.lvds_gen_cntl & LVDS_BL_MOD_EN);
-			rinfo->pending_lvds_gen_cntl = lvds_gen_cntl;
-			mod_timer(&rinfo->lvds_timer,
-				  jiffies + msecs_to_jiffies(rinfo->panel_info.pwr_delay));
-		} else {
-			lvds_gen_cntl &= ~LVDS_BL_MOD_LEVEL_MASK;
-			lvds_gen_cntl |= (conv_table[level] <<
-					  LVDS_BL_MOD_LEVEL_SHIFT);
-			OUTREG(LVDS_GEN_CNTL, lvds_gen_cntl);
-		}
-		rinfo->init_state.lvds_gen_cntl &= ~LVDS_STATE_MASK;
-		rinfo->init_state.lvds_gen_cntl |= rinfo->pending_lvds_gen_cntl
-			& LVDS_STATE_MASK;
-	} else {
-		/* Asic bug, when turning off LVDS_ON, we have to make sure
-		   RADEON_PIXCLK_LVDS_ALWAYS_ON bit is off
-		*/
-		tmpPixclksCntl = INPLL(PIXCLKS_CNTL);
-		if (rinfo->is_mobility || rinfo->is_IGP)
-			OUTPLLP(PIXCLKS_CNTL, 0, ~PIXCLK_LVDS_ALWAYS_ONb);
-		lvds_gen_cntl &= ~(LVDS_BL_MOD_LEVEL_MASK | LVDS_BL_MOD_EN);
-		lvds_gen_cntl |= (conv_table[0] <<
-				  LVDS_BL_MOD_LEVEL_SHIFT);
-		lvds_gen_cntl |= LVDS_DISPLAY_DIS;
-		OUTREG(LVDS_GEN_CNTL, lvds_gen_cntl);
-		udelay(100);
-		lvds_gen_cntl &= ~(LVDS_ON | LVDS_EN);
-		OUTREG(LVDS_GEN_CNTL, lvds_gen_cntl);
-		lvds_gen_cntl &= ~(LVDS_DIGON);
-		rinfo->pending_lvds_gen_cntl = lvds_gen_cntl;
-		mod_timer(&rinfo->lvds_timer,
-			  jiffies + msecs_to_jiffies(rinfo->panel_info.pwr_delay));
-		if (rinfo->is_mobility || rinfo->is_IGP)
-			OUTPLL(PIXCLKS_CNTL, tmpPixclksCntl);
-	}
-	rinfo->init_state.lvds_gen_cntl &= ~LVDS_STATE_MASK;
-	rinfo->init_state.lvds_gen_cntl |= (lvds_gen_cntl & LVDS_STATE_MASK);
-
-	return 0;
-}
-
-
-static int radeon_set_backlight_level(int level, void *data)
-{
-	return radeon_set_backlight_enable(1, level, data);
-}
-#endif /* CONFIG_PMAC_BACKLIGHT */
-
-
 /*
  * This reconfigure the card's internal memory map. In theory, we'd like
  * to setup the card's memory at the same address as it's PCI bus address,
@@ -2477,14 +2349,7 @@ static int __devinit radeonfb_pci_register (struct pci_dev *pdev,
 						 MTRR_TYPE_WRCOMB, 1);
 #endif
 
-#ifdef CONFIG_PMAC_BACKLIGHT
-	if (rinfo->mon1_type == MT_LCD) {
-		register_backlight_controller(&radeon_backlight_controller,
-					      rinfo, "ati");
-		register_backlight_controller(&radeon_backlight_controller,
-					      rinfo, "mnca");
-	}
-#endif
+	radeonfb_bl_init(rinfo);
 
 	printk ("radeonfb (%s): %s\n", pci_name(rinfo->pdev), rinfo->name);
 
@@ -2528,7 +2393,8 @@ static void __devexit radeonfb_pci_unregister (struct pci_dev *pdev)
  
         if (!rinfo)
                 return;
- 
+
+	radeonfb_bl_exit(rinfo);
 	radeonfb_pm_exit(rinfo);
 
 	if (rinfo->mon1_EDID)
diff --git a/drivers/video/aty/radeonfb.h b/drivers/video/aty/radeonfb.h
index 217e00ab4a2d..1645943b1123 100644
--- a/drivers/video/aty/radeonfb.h
+++ b/drivers/video/aty/radeonfb.h
@@ -625,4 +625,13 @@ extern int radeon_screen_blank(struct radeonfb_info *rinfo, int blank, int mode_
 extern void radeon_write_mode (struct radeonfb_info *rinfo, struct radeon_regs *mode,
 			       int reg_only);
 
+/* Backlight functions */
+#ifdef CONFIG_FB_RADEON_BACKLIGHT
+extern void radeonfb_bl_init(struct radeonfb_info *rinfo);
+extern void radeonfb_bl_exit(struct radeonfb_info *rinfo);
+#else
+static inline void radeonfb_bl_init(struct radeonfb_info *rinfo) {}
+static inline void radeonfb_bl_exit(struct radeonfb_info *rinfo) {}
+#endif
+
 #endif /* __RADEONFB_H__ */