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authorMichael Hanselmann <linux-kernel@hansmi.ch>2006-06-25 08:47:08 -0400
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-25 13:00:59 -0400
commit5474c120aafe78ca54bf272f7a01107c42da2b21 (patch)
treec1b002a27703ce92c816bfb9844752186e33d403 /drivers/video/nvidia/nv_backlight.c
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/nv_backlight.c')
-rw-r--r--drivers/video/nvidia/nv_backlight.c175
1 files changed, 175 insertions, 0 deletions
diff --git a/drivers/video/nvidia/nv_backlight.c b/drivers/video/nvidia/nv_backlight.c
new file mode 100644
index 000000000000..1c1c10c699c5
--- /dev/null
+++ b/drivers/video/nvidia/nv_backlight.c
@@ -0,0 +1,175 @@
1/*
2 * Backlight code for nVidia based graphic cards
3 *
4 * Copyright 2004 Antonino Daplas <adaplas@pol.net>
5 * Copyright (c) 2006 Michael Hanselmann <linux-kernel@hansmi.ch>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
12#include <linux/backlight.h>
13#include <linux/fb.h>
14#include <linux/pci.h>
15#include "nv_local.h"
16#include "nv_type.h"
17#include "nv_proto.h"
18
19#ifdef CONFIG_PMAC_BACKLIGHT
20#include <asm/backlight.h>
21#include <asm/machdep.h>
22#endif
23
24/* We do not have any information about which values are allowed, thus
25 * we used safe values.
26 */
27#define MIN_LEVEL 0x158
28#define MAX_LEVEL 0x534
29
30static struct backlight_properties nvidia_bl_data;
31
32static int nvidia_bl_get_level_brightness(struct nvidia_par *par,
33 int level)
34{
35 struct fb_info *info = pci_get_drvdata(par->pci_dev);
36 int nlevel;
37
38 /* Get and convert the value */
39 mutex_lock(&info->bl_mutex);
40 nlevel = info->bl_curve[level] * FB_BACKLIGHT_MAX / MAX_LEVEL;
41 mutex_unlock(&info->bl_mutex);
42
43 if (nlevel < 0)
44 nlevel = 0;
45 else if (nlevel < MIN_LEVEL)
46 nlevel = MIN_LEVEL;
47 else if (nlevel > MAX_LEVEL)
48 nlevel = MAX_LEVEL;
49
50 return nlevel;
51}
52
53static int nvidia_bl_update_status(struct backlight_device *bd)
54{
55 struct nvidia_par *par = class_get_devdata(&bd->class_dev);
56 u32 tmp_pcrt, tmp_pmc, fpcontrol;
57 int level;
58
59 if (!par->FlatPanel)
60 return 0;
61
62 if (bd->props->power != FB_BLANK_UNBLANK ||
63 bd->props->fb_blank != FB_BLANK_UNBLANK)
64 level = 0;
65 else
66 level = bd->props->brightness;
67
68 tmp_pmc = NV_RD32(par->PMC, 0x10F0) & 0x0000FFFF;
69 tmp_pcrt = NV_RD32(par->PCRTC0, 0x081C) & 0xFFFFFFFC;
70 fpcontrol = NV_RD32(par->PRAMDAC, 0x0848) & 0xCFFFFFCC;
71
72 if (level > 0) {
73 tmp_pcrt |= 0x1;
74 tmp_pmc |= (1 << 31); /* backlight bit */
75 tmp_pmc |= nvidia_bl_get_level_brightness(par, level) << 16;
76 fpcontrol |= par->fpSyncs;
77 } else
78 fpcontrol |= 0x20000022;
79
80 NV_WR32(par->PCRTC0, 0x081C, tmp_pcrt);
81 NV_WR32(par->PMC, 0x10F0, tmp_pmc);
82 NV_WR32(par->PRAMDAC, 0x848, fpcontrol);
83
84 return 0;
85}
86
87static int nvidia_bl_get_brightness(struct backlight_device *bd)
88{
89 return bd->props->brightness;
90}
91
92static struct backlight_properties nvidia_bl_data = {
93 .owner = THIS_MODULE,
94 .get_brightness = nvidia_bl_get_brightness,
95 .update_status = nvidia_bl_update_status,
96 .max_brightness = (FB_BACKLIGHT_LEVELS - 1),
97};
98
99void nvidia_bl_init(struct nvidia_par *par)
100{
101 struct fb_info *info = pci_get_drvdata(par->pci_dev);
102 struct backlight_device *bd;
103 char name[12];
104
105 if (!par->FlatPanel)
106 return;
107
108#ifdef CONFIG_PMAC_BACKLIGHT
109 if (!machine_is(powermac) ||
110 !pmac_has_backlight_type("mnca"))
111 return;
112#endif
113
114 snprintf(name, sizeof(name), "nvidiabl%d", info->node);
115
116 bd = backlight_device_register(name, par, &nvidia_bl_data);
117 if (IS_ERR(bd)) {
118 info->bl_dev = NULL;
119 printk("nvidia: Backlight registration failed\n");
120 goto error;
121 }
122
123 mutex_lock(&info->bl_mutex);
124 info->bl_dev = bd;
125 fb_bl_default_curve(info, 0,
126 0x158 * FB_BACKLIGHT_MAX / MAX_LEVEL,
127 0x534 * FB_BACKLIGHT_MAX / MAX_LEVEL);
128 mutex_unlock(&info->bl_mutex);
129
130 up(&bd->sem);
131 bd->props->brightness = nvidia_bl_data.max_brightness;
132 bd->props->power = FB_BLANK_UNBLANK;
133 bd->props->update_status(bd);
134 down(&bd->sem);
135
136#ifdef CONFIG_PMAC_BACKLIGHT
137 mutex_lock(&pmac_backlight_mutex);
138 if (!pmac_backlight)
139 pmac_backlight = bd;
140 mutex_unlock(&pmac_backlight_mutex);
141#endif
142
143 printk("nvidia: Backlight initialized (%s)\n", name);
144
145 return;
146
147error:
148 return;
149}
150
151void nvidia_bl_exit(struct nvidia_par *par)
152{
153 struct fb_info *info = pci_get_drvdata(par->pci_dev);
154
155#ifdef CONFIG_PMAC_BACKLIGHT
156 mutex_lock(&pmac_backlight_mutex);
157#endif
158
159 mutex_lock(&info->bl_mutex);
160 if (info->bl_dev) {
161#ifdef CONFIG_PMAC_BACKLIGHT
162 if (pmac_backlight == info->bl_dev)
163 pmac_backlight = NULL;
164#endif
165
166 backlight_device_unregister(info->bl_dev);
167
168 printk("nvidia: Backlight unloaded\n");
169 }
170 mutex_unlock(&info->bl_mutex);
171
172#ifdef CONFIG_PMAC_BACKLIGHT
173 mutex_unlock(&pmac_backlight_mutex);
174#endif
175}