[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>

1 files changed, 14 insertions, 81 deletions

diff --git a/drivers/video/nvidia/nvidia.c b/drivers/video/nvidia/nvidia.c
index 093ab9977c7c..03a7c1e9ce38 100644
--- a/drivers/video/nvidia/nvidia.c
+++ b/drivers/video/nvidia/nvidia.c
@@ -22,6 +22,7 @@
 #include <linux/init.h>
 #include <linux/pci.h>
 #include <linux/console.h>
+#include <linux/backlight.h>
 #ifdef CONFIG_MTRR
 #include <asm/mtrr.h>
 #endif
@@ -29,10 +30,6 @@
 #include <asm/prom.h>
 #include <asm/pci-bridge.h>
 #endif
-#ifdef CONFIG_PMAC_BACKLIGHT
-#include <asm/machdep.h>
-#include <asm/backlight.h>
-#endif
 
 #include "nv_local.h"
 #include "nv_type.h"
@@ -470,75 +467,6 @@ static struct fb_var_screeninfo __devinitdata nvidiafb_default_var = {
         .vmode = FB_VMODE_NONINTERLACED
 };
 
-/*
- * Backlight control
- */
-#ifdef CONFIG_PMAC_BACKLIGHT
-
-static int nvidia_backlight_levels[] = {
-        0x158,
-        0x192,
-        0x1c6,
-        0x200,
-        0x234,
-        0x268,
-        0x2a2,
-        0x2d6,
-        0x310,
-        0x344,
-        0x378,
-        0x3b2,
-        0x3e6,
-        0x41a,
-        0x454,
-        0x534,
-};
-
-/* ------------------------------------------------------------------------- *
- *
- * Backlight operations
- *
- * ------------------------------------------------------------------------- */
-
-static int nvidia_set_backlight_enable(int on, int level, void *data)
-{
-        struct nvidia_par *par = data;
-        u32 tmp_pcrt, tmp_pmc, fpcontrol;
-
-        tmp_pmc = NV_RD32(par->PMC, 0x10F0) & 0x0000FFFF;
-        tmp_pcrt = NV_RD32(par->PCRTC0, 0x081C) & 0xFFFFFFFC;
-        fpcontrol = NV_RD32(par->PRAMDAC, 0x0848) & 0xCFFFFFCC;
-
-        if (on && (level > BACKLIGHT_OFF)) {
-                tmp_pcrt |= 0x1;
-                tmp_pmc |= (1 << 31);   // backlight bit
-                tmp_pmc |= nvidia_backlight_levels[level - 1] << 16;
-        }
-
-        if (on)
-                fpcontrol |= par->fpSyncs;
-        else
-                fpcontrol |= 0x20000022;
-
-        NV_WR32(par->PCRTC0, 0x081C, tmp_pcrt);
-        NV_WR32(par->PMC, 0x10F0, tmp_pmc);
-        NV_WR32(par->PRAMDAC, 0x848, fpcontrol);
-
-        return 0;
-}
-
-static int nvidia_set_backlight_level(int level, void *data)
-{
-        return nvidia_set_backlight_enable(1, level, data);
-}
-
-static struct backlight_controller nvidia_backlight_controller = {
-        nvidia_set_backlight_enable,
-        nvidia_set_backlight_level
-};
-
-#endif                          /* CONFIG_PMAC_BACKLIGHT */
-
 static void nvidiafb_load_cursor_image(struct nvidia_par *par, u8 * data8,
                                        u16 bg, u16 fg, u32 w, u32 h)
 {
@@ -1355,10 +1283,15 @@ static int nvidiafb_blank(int blank, struct fb_info *info)
         NVWriteSeq(par, 0x01, tmp);
         NVWriteCrtc(par, 0x1a, vesa);
 
-#ifdef CONFIG_PMAC_BACKLIGHT
-        if (par->FlatPanel && machine_is(powermac)) {
-                set_backlight_enable(!blank);
+#ifdef CONFIG_FB_NVIDIA_BACKLIGHT
+        mutex_lock(&info->bl_mutex);
+        if (info->bl_dev) {
+                down(&info->bl_dev->sem);
+                info->bl_dev->props->power = blank;
+                info->bl_dev->props->update_status(info->bl_dev);
+                up(&info->bl_dev->sem);
         }
+        mutex_unlock(&info->bl_mutex);
 #endif
 
         NVTRACE_LEAVE();
@@ -1741,11 +1674,9 @@ static int __devinit nvidiafb_probe(struct pci_dev *pd,
                "PCI nVidia %s framebuffer (%dMB @ 0x%lX)\n",
                info->fix.id,
                par->FbMapSize / (1024 * 1024), info->fix.smem_start);
-#ifdef CONFIG_PMAC_BACKLIGHT
-        if (par->FlatPanel && machine_is(powermac))
-                register_backlight_controller(&nvidia_backlight_controller,
-                                              par, "mnca");
-#endif
+
+        nvidia_bl_init(par);
+
         NVTRACE_LEAVE();
         return 0;
 
@@ -1775,6 +1706,8 @@ static void __exit nvidiafb_remove(struct pci_dev *pd)
 
         NVTRACE_ENTER();
 
+        nvidia_bl_exit(par);
+
         unregister_framebuffer(info);
 #ifdef CONFIG_MTRR
         if (par->mtrr.vram_valid)