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authorMichael Hanselmann <linux-kernel@hansmi.ch>2006-06-25 05:47:08 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-25 10:00:59 -0700
commit5474c120aafe78ca54bf272f7a01107c42da2b21 (patch)
treec1b002a27703ce92c816bfb9844752186e33d403 /drivers/video/nvidia
parent17660bdd5c1f1a165273c1a59cb5b87670a81cc4 (diff)
[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>
Diffstat (limited to 'drivers/video/nvidia')
-rw-r--r--drivers/video/nvidia/Makefile3
-rw-r--r--drivers/video/nvidia/nv_backlight.c175
-rw-r--r--drivers/video/nvidia/nv_proto.h10
-rw-r--r--drivers/video/nvidia/nvidia.c95
4 files changed, 201 insertions, 82 deletions
diff --git a/drivers/video/nvidia/Makefile b/drivers/video/nvidia/Makefile
index 690d37e8de5..ca47432113e 100644
--- a/drivers/video/nvidia/Makefile
+++ b/drivers/video/nvidia/Makefile
@@ -7,6 +7,7 @@ obj-$(CONFIG_FB_NVIDIA) += nvidiafb.o
nvidiafb-y := nvidia.o nv_hw.o nv_setup.o \
nv_accel.o
nvidiafb-$(CONFIG_FB_NVIDIA_I2C) += nv_i2c.o
+nvidiafb-$(CONFIG_FB_NVIDIA_BACKLIGHT) += nv_backlight.o
nvidiafb-$(CONFIG_PPC_OF) += nv_of.o
-nvidiafb-objs := $(nvidiafb-y) \ No newline at end of file
+nvidiafb-objs := $(nvidiafb-y)
diff --git a/drivers/video/nvidia/nv_backlight.c b/drivers/video/nvidia/nv_backlight.c
new file mode 100644
index 00000000000..1c1c10c699c
--- /dev/null
+++ b/drivers/video/nvidia/nv_backlight.c
@@ -0,0 +1,175 @@
+/*
+ * Backlight code for nVidia based graphic cards
+ *
+ * Copyright 2004 Antonino Daplas <adaplas@pol.net>
+ * 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 <linux/backlight.h>
+#include <linux/fb.h>
+#include <linux/pci.h>
+#include "nv_local.h"
+#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.
+ */
+#define MIN_LEVEL 0x158
+#define MAX_LEVEL 0x534
+
+static struct backlight_properties nvidia_bl_data;
+
+static int nvidia_bl_get_level_brightness(struct nvidia_par *par,
+ int level)
+{
+ struct fb_info *info = pci_get_drvdata(par->pci_dev);
+ int nlevel;
+
+ /* Get and convert the value */
+ mutex_lock(&info->bl_mutex);
+ nlevel = info->bl_curve[level] * FB_BACKLIGHT_MAX / MAX_LEVEL;
+ mutex_unlock(&info->bl_mutex);
+
+ if (nlevel < 0)
+ nlevel = 0;
+ else if (nlevel < MIN_LEVEL)
+ nlevel = MIN_LEVEL;
+ else if (nlevel > MAX_LEVEL)
+ nlevel = MAX_LEVEL;
+
+ return nlevel;
+}
+
+static int nvidia_bl_update_status(struct backlight_device *bd)
+{
+ struct nvidia_par *par = class_get_devdata(&bd->class_dev);
+ u32 tmp_pcrt, tmp_pmc, fpcontrol;
+ int level;
+
+ if (!par->FlatPanel)
+ return 0;
+
+ if (bd->props->power != FB_BLANK_UNBLANK ||
+ bd->props->fb_blank != FB_BLANK_UNBLANK)
+ level = 0;
+ else
+ level = bd->props->brightness;
+
+ tmp_pmc = NV_RD32(par->PMC, 0x10F0) & 0x0000FFFF;
+ tmp_pcrt = NV_RD32(par->PCRTC0, 0x081C) & 0xFFFFFFFC;
+ fpcontrol = NV_RD32(par->PRAMDAC, 0x0848) & 0xCFFFFFCC;
+
+ if (level > 0) {
+ tmp_pcrt |= 0x1;
+ tmp_pmc |= (1 << 31); /* backlight bit */
+ tmp_pmc |= nvidia_bl_get_level_brightness(par, level) << 16;
+ 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_bl_get_brightness(struct backlight_device *bd)
+{
+ return bd->props->brightness;
+}
+
+static struct backlight_properties nvidia_bl_data = {
+ .owner = THIS_MODULE,
+ .get_brightness = nvidia_bl_get_brightness,
+ .update_status = nvidia_bl_update_status,
+ .max_brightness = (FB_BACKLIGHT_LEVELS - 1),
+};
+
+void nvidia_bl_init(struct nvidia_par *par)
+{
+ struct fb_info *info = pci_get_drvdata(par->pci_dev);
+ struct backlight_device *bd;
+ char name[12];
+
+ if (!par->FlatPanel)
+ return;
+
+#ifdef CONFIG_PMAC_BACKLIGHT
+ if (!machine_is(powermac) ||
+ !pmac_has_backlight_type("mnca"))
+ return;
+#endif
+
+ snprintf(name, sizeof(name), "nvidiabl%d", info->node);
+
+ bd = backlight_device_register(name, par, &nvidia_bl_data);
+ if (IS_ERR(bd)) {
+ info->bl_dev = NULL;
+ printk("nvidia: Backlight registration failed\n");
+ goto error;
+ }
+
+ mutex_lock(&info->bl_mutex);
+ info->bl_dev = bd;
+ fb_bl_default_curve(info, 0,
+ 0x158 * FB_BACKLIGHT_MAX / MAX_LEVEL,
+ 0x534 * FB_BACKLIGHT_MAX / MAX_LEVEL);
+ mutex_unlock(&info->bl_mutex);
+
+ up(&bd->sem);
+ bd->props->brightness = nvidia_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("nvidia: Backlight initialized (%s)\n", name);
+
+ return;
+
+error:
+ return;
+}
+
+void nvidia_bl_exit(struct nvidia_par *par)
+{
+ struct fb_info *info = pci_get_drvdata(par->pci_dev);
+
+#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("nvidia: Backlight unloaded\n");
+ }
+ mutex_unlock(&info->bl_mutex);
+
+#ifdef CONFIG_PMAC_BACKLIGHT
+ mutex_unlock(&pmac_backlight_mutex);
+#endif
+}
diff --git a/drivers/video/nvidia/nv_proto.h b/drivers/video/nvidia/nv_proto.h
index b149a690ee0..6fba656cd56 100644
--- a/drivers/video/nvidia/nv_proto.h
+++ b/drivers/video/nvidia/nv_proto.h
@@ -63,4 +63,14 @@ extern void nvidiafb_imageblit(struct fb_info *info,
const struct fb_image *image);
extern int nvidiafb_sync(struct fb_info *info);
extern u8 byte_rev[256];
+
+/* in nv_backlight.h */
+#ifdef CONFIG_FB_NVIDIA_BACKLIGHT
+extern void nvidia_bl_init(struct nvidia_par *par);
+extern void nvidia_bl_exit(struct nvidia_par *par);
+#else
+static inline void nvidia_bl_init(struct nvidia_par *par) {}
+static inline void nvidia_bl_exit(struct nvidia_par *par) {}
+#endif
+
#endif /* __NV_PROTO_H__ */
diff --git a/drivers/video/nvidia/nvidia.c b/drivers/video/nvidia/nvidia.c
index 093ab9977c7..03a7c1e9ce3 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)