Commit | Line | Data |
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5474c120 MH |
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 | ||
5474c120 MH |
19 | /* We do not have any information about which values are allowed, thus |
20 | * we used safe values. | |
21 | */ | |
22 | #define MIN_LEVEL 0x158 | |
23 | #define MAX_LEVEL 0x534 | |
e01af038 | 24 | #define LEVEL_STEP ((MAX_LEVEL - MIN_LEVEL) / FB_BACKLIGHT_MAX) |
5474c120 MH |
25 | |
26 | static struct backlight_properties nvidia_bl_data; | |
27 | ||
28 | static int nvidia_bl_get_level_brightness(struct nvidia_par *par, | |
29 | int level) | |
30 | { | |
31 | struct fb_info *info = pci_get_drvdata(par->pci_dev); | |
32 | int nlevel; | |
33 | ||
34 | /* Get and convert the value */ | |
37ce69a5 | 35 | /* No locking of bl_curve since we read a single value */ |
e01af038 | 36 | nlevel = MIN_LEVEL + info->bl_curve[level] * LEVEL_STEP; |
5474c120 MH |
37 | |
38 | if (nlevel < 0) | |
39 | nlevel = 0; | |
40 | else if (nlevel < MIN_LEVEL) | |
41 | nlevel = MIN_LEVEL; | |
42 | else if (nlevel > MAX_LEVEL) | |
43 | nlevel = MAX_LEVEL; | |
44 | ||
45 | return nlevel; | |
46 | } | |
47 | ||
37ce69a5 | 48 | static int nvidia_bl_update_status(struct backlight_device *bd) |
5474c120 MH |
49 | { |
50 | struct nvidia_par *par = class_get_devdata(&bd->class_dev); | |
51 | u32 tmp_pcrt, tmp_pmc, fpcontrol; | |
52 | int level; | |
53 | ||
54 | if (!par->FlatPanel) | |
55 | return 0; | |
56 | ||
599a52d1 RP |
57 | if (bd->props.power != FB_BLANK_UNBLANK || |
58 | bd->props.fb_blank != FB_BLANK_UNBLANK) | |
5474c120 MH |
59 | level = 0; |
60 | else | |
599a52d1 | 61 | level = bd->props.brightness; |
5474c120 MH |
62 | |
63 | tmp_pmc = NV_RD32(par->PMC, 0x10F0) & 0x0000FFFF; | |
64 | tmp_pcrt = NV_RD32(par->PCRTC0, 0x081C) & 0xFFFFFFFC; | |
65 | fpcontrol = NV_RD32(par->PRAMDAC, 0x0848) & 0xCFFFFFCC; | |
66 | ||
67 | if (level > 0) { | |
68 | tmp_pcrt |= 0x1; | |
69 | tmp_pmc |= (1 << 31); /* backlight bit */ | |
70 | tmp_pmc |= nvidia_bl_get_level_brightness(par, level) << 16; | |
71 | fpcontrol |= par->fpSyncs; | |
72 | } else | |
73 | fpcontrol |= 0x20000022; | |
74 | ||
75 | NV_WR32(par->PCRTC0, 0x081C, tmp_pcrt); | |
76 | NV_WR32(par->PMC, 0x10F0, tmp_pmc); | |
77 | NV_WR32(par->PRAMDAC, 0x848, fpcontrol); | |
78 | ||
79 | return 0; | |
80 | } | |
81 | ||
82 | static int nvidia_bl_get_brightness(struct backlight_device *bd) | |
83 | { | |
599a52d1 | 84 | return bd->props.brightness; |
5474c120 MH |
85 | } |
86 | ||
599a52d1 | 87 | static struct backlight_ops nvidia_bl_ops = { |
5474c120 MH |
88 | .get_brightness = nvidia_bl_get_brightness, |
89 | .update_status = nvidia_bl_update_status, | |
5474c120 MH |
90 | }; |
91 | ||
92 | void nvidia_bl_init(struct nvidia_par *par) | |
93 | { | |
94 | struct fb_info *info = pci_get_drvdata(par->pci_dev); | |
95 | struct backlight_device *bd; | |
96 | char name[12]; | |
97 | ||
98 | if (!par->FlatPanel) | |
99 | return; | |
100 | ||
101 | #ifdef CONFIG_PMAC_BACKLIGHT | |
102 | if (!machine_is(powermac) || | |
103 | !pmac_has_backlight_type("mnca")) | |
104 | return; | |
105 | #endif | |
106 | ||
107 | snprintf(name, sizeof(name), "nvidiabl%d", info->node); | |
108 | ||
599a52d1 | 109 | bd = backlight_device_register(name, info->dev, par, &nvidia_bl_ops); |
5474c120 MH |
110 | if (IS_ERR(bd)) { |
111 | info->bl_dev = NULL; | |
98a3c781 | 112 | printk(KERN_WARNING "nvidia: Backlight registration failed\n"); |
5474c120 MH |
113 | goto error; |
114 | } | |
115 | ||
5474c120 MH |
116 | info->bl_dev = bd; |
117 | fb_bl_default_curve(info, 0, | |
118 | 0x158 * FB_BACKLIGHT_MAX / MAX_LEVEL, | |
119 | 0x534 * FB_BACKLIGHT_MAX / MAX_LEVEL); | |
5474c120 | 120 | |
599a52d1 RP |
121 | bd->props.max_brightness = FB_BACKLIGHT_LEVELS - 1; |
122 | bd->props.brightness = nvidia_bl_data.max_brightness; | |
123 | bd->props.power = FB_BLANK_UNBLANK; | |
28ee086d | 124 | backlight_update_status(bd); |
5474c120 | 125 | |
5474c120 MH |
126 | printk("nvidia: Backlight initialized (%s)\n", name); |
127 | ||
128 | return; | |
129 | ||
130 | error: | |
131 | return; | |
132 | } | |
133 | ||
134 | void nvidia_bl_exit(struct nvidia_par *par) | |
135 | { | |
136 | struct fb_info *info = pci_get_drvdata(par->pci_dev); | |
37ce69a5 | 137 | struct backlight_device *bd = info->bl_dev; |
5474c120 | 138 | |
321709c5 RP |
139 | backlight_device_unregister(bd); |
140 | printk("nvidia: Backlight unloaded\n"); | |
5474c120 | 141 | } |