Michael Hanselmann | 5474c12 | 2006-06-25 05:47:08 -0700 | [diff] [blame] | 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 | |
| 30 | static struct backlight_properties nvidia_bl_data; |
| 31 | |
| 32 | static 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 | |
| 53 | static 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 | |
| 87 | static int nvidia_bl_get_brightness(struct backlight_device *bd) |
| 88 | { |
| 89 | return bd->props->brightness; |
| 90 | } |
| 91 | |
| 92 | static 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 | |
| 99 | void 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 | |
| 147 | error: |
| 148 | return; |
| 149 | } |
| 150 | |
| 151 | void 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 | } |