Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 | /* * 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> #ifdef CONFIG_PMAC_BACKLIGHT #include <asm/backlight.h> #endif #include "nv_local.h" #include "nv_type.h" #include "nv_proto.h" /* We do not have any information about which values are allowed, thus * we used safe values. */ #define MIN_LEVEL 0x158 #define MAX_LEVEL 0x534 #define LEVEL_STEP ((MAX_LEVEL - MIN_LEVEL) / FB_BACKLIGHT_MAX) 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 */ /* No locking of bl_curve since we read a single value */ nlevel = MIN_LEVEL + info->bl_curve[level] * LEVEL_STEP; 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 = bl_get_data(bd); 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 const struct backlight_ops nvidia_bl_ops = { .get_brightness = nvidia_bl_get_brightness, .update_status = nvidia_bl_update_status, }; void nvidia_bl_init(struct nvidia_par *par) { struct backlight_properties props; 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); memset(&props, 0, sizeof(struct backlight_properties)); props.type = BACKLIGHT_RAW; props.max_brightness = FB_BACKLIGHT_LEVELS - 1; bd = backlight_device_register(name, info->dev, par, &nvidia_bl_ops, &props); if (IS_ERR(bd)) { info->bl_dev = NULL; printk(KERN_WARNING "nvidia: Backlight registration failed\n"); goto error; } info->bl_dev = bd; fb_bl_default_curve(info, 0, 0x158 * FB_BACKLIGHT_MAX / MAX_LEVEL, 0x534 * FB_BACKLIGHT_MAX / MAX_LEVEL); bd->props.brightness = bd->props.max_brightness; bd->props.power = FB_BLANK_UNBLANK; backlight_update_status(bd); 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); struct backlight_device *bd = info->bl_dev; backlight_device_unregister(bd); printk("nvidia: Backlight unloaded\n"); } |