1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * Mini fbset implementation for busybox
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4 | *
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5 | * Copyright (C) 1999 by Randolph Chung <tausq@debian.org>
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6 | *
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7 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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8 | *
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9 | * This is a from-scratch implementation of fbset; but the de facto fbset
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10 | * implementation was a good reference. fbset (original) is released under
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11 | * the GPL, and is (c) 1995-1999 by:
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12 | * Geert Uytterhoeven (Geert.Uytterhoeven@cs.kuleuven.ac.be)
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13 | */
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14 |
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15 | #include "libbb.h"
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16 |
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17 | #define DEFAULTFBDEV FB_0
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18 | #define DEFAULTFBMODE "/etc/fb.modes"
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19 |
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20 | enum {
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21 | OPT_CHANGE = (1 << 0),
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22 | OPT_INFO = (1 << 1),
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23 | OPT_READMODE = (1 << 2),
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24 | OPT_ALL = (1 << 9),
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25 |
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26 | CMD_FB = 1,
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27 | CMD_DB = 2,
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28 | CMD_GEOMETRY = 3,
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29 | CMD_TIMING = 4,
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30 | CMD_ACCEL = 5,
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31 | CMD_HSYNC = 6,
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32 | CMD_VSYNC = 7,
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33 | CMD_LACED = 8,
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34 | CMD_DOUBLE = 9,
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35 | /* CMD_XCOMPAT = 10, */
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36 | CMD_ALL = 11,
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37 | CMD_INFO = 12,
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38 | CMD_CHANGE = 13,
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39 |
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40 | #if ENABLE_FEATURE_FBSET_FANCY
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41 | CMD_XRES = 100,
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42 | CMD_YRES = 101,
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43 | CMD_VXRES = 102,
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44 | CMD_VYRES = 103,
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45 | CMD_DEPTH = 104,
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46 | CMD_MATCH = 105,
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47 | CMD_PIXCLOCK = 106,
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48 | CMD_LEFT = 107,
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49 | CMD_RIGHT = 108,
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50 | CMD_UPPER = 109,
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51 | CMD_LOWER = 110,
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52 | CMD_HSLEN = 111,
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53 | CMD_VSLEN = 112,
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54 | CMD_CSYNC = 113,
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55 | CMD_GSYNC = 114,
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56 | CMD_EXTSYNC = 115,
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57 | CMD_BCAST = 116,
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58 | CMD_RGBA = 117,
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59 | CMD_STEP = 118,
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60 | CMD_MOVE = 119,
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61 | #endif
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62 | };
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63 |
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64 | static unsigned g_options;
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65 |
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66 | /* Stuff stolen from the kernel's fb.h */
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67 | #define FB_ACTIVATE_ALL 64
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68 | enum {
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69 | FBIOGET_VSCREENINFO = 0x4600,
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70 | FBIOPUT_VSCREENINFO = 0x4601
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71 | };
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72 | struct fb_bitfield {
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73 | uint32_t offset; /* beginning of bitfield */
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74 | uint32_t length; /* length of bitfield */
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75 | uint32_t msb_right; /* !=0: Most significant bit is right */
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76 | };
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77 | struct fb_var_screeninfo {
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78 | uint32_t xres; /* visible resolution */
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79 | uint32_t yres;
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80 | uint32_t xres_virtual; /* virtual resolution */
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81 | uint32_t yres_virtual;
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82 | uint32_t xoffset; /* offset from virtual to visible */
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83 | uint32_t yoffset; /* resolution */
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84 |
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85 | uint32_t bits_per_pixel;
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86 | uint32_t grayscale; /* !=0 Graylevels instead of colors */
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87 |
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88 | struct fb_bitfield red; /* bitfield in fb mem if true color, */
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89 | struct fb_bitfield green; /* else only length is significant */
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90 | struct fb_bitfield blue;
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91 | struct fb_bitfield transp; /* transparency */
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92 |
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93 | uint32_t nonstd; /* !=0 Non standard pixel format */
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94 |
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95 | uint32_t activate; /* see FB_ACTIVATE_x */
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96 |
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97 | uint32_t height; /* height of picture in mm */
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98 | uint32_t width; /* width of picture in mm */
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99 |
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100 | uint32_t accel_flags; /* acceleration flags (hints) */
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101 |
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102 | /* Timing: All values in pixclocks, except pixclock (of course) */
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103 | uint32_t pixclock; /* pixel clock in ps (pico seconds) */
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104 | uint32_t left_margin; /* time from sync to picture */
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105 | uint32_t right_margin; /* time from picture to sync */
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106 | uint32_t upper_margin; /* time from sync to picture */
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107 | uint32_t lower_margin;
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108 | uint32_t hsync_len; /* length of horizontal sync */
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109 | uint32_t vsync_len; /* length of vertical sync */
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110 | uint32_t sync; /* see FB_SYNC_x */
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111 | uint32_t vmode; /* see FB_VMODE_x */
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112 | uint32_t reserved[6]; /* Reserved for future compatibility */
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113 | };
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114 |
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115 |
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116 | static const struct cmdoptions_t {
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117 | const char name[10];
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118 | const unsigned char param_count;
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119 | const unsigned char code;
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120 | } g_cmdoptions[] = {
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121 | { "-fb", 1, CMD_FB },
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122 | { "-db", 1, CMD_DB },
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123 | { "-a", 0, CMD_ALL },
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124 | { "-i", 0, CMD_INFO },
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125 | { "-g", 5, CMD_GEOMETRY },
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126 | { "-t", 7, CMD_TIMING },
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127 | { "-accel", 1, CMD_ACCEL },
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128 | { "-hsync", 1, CMD_HSYNC },
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129 | { "-vsync", 1, CMD_VSYNC },
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130 | { "-laced", 1, CMD_LACED },
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131 | { "-double", 1, CMD_DOUBLE },
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132 | { "-n", 0, CMD_CHANGE },
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133 | #if ENABLE_FEATURE_FBSET_FANCY
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134 | { "-all", 0, CMD_ALL },
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135 | { "-xres", 1, CMD_XRES },
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136 | { "-yres", 1, CMD_YRES },
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137 | { "-vxres", 1, CMD_VXRES },
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138 | { "-vyres", 1, CMD_VYRES },
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139 | { "-depth", 1, CMD_DEPTH },
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140 | { "-match", 0, CMD_MATCH },
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141 | { "-geometry", 5, CMD_GEOMETRY },
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142 | { "-pixclock", 1, CMD_PIXCLOCK },
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143 | { "-left", 1, CMD_LEFT },
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144 | { "-right", 1, CMD_RIGHT },
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145 | { "-upper", 1, CMD_UPPER },
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146 | { "-lower", 1, CMD_LOWER },
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147 | { "-hslen", 1, CMD_HSLEN },
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148 | { "-vslen", 1, CMD_VSLEN },
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149 | { "-timings", 7, CMD_TIMING },
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150 | { "-csync", 1, CMD_CSYNC },
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151 | { "-gsync", 1, CMD_GSYNC },
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152 | { "-extsync", 1, CMD_EXTSYNC },
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153 | { "-bcast", 1, CMD_BCAST },
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154 | { "-rgba", 1, CMD_RGBA },
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155 | { "-step", 1, CMD_STEP },
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156 | { "-move", 1, CMD_MOVE },
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157 | #endif
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158 | { "", 0, 0 }
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159 | };
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160 |
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161 | #if ENABLE_FEATURE_FBSET_READMODE
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162 | /* taken from linux/fb.h */
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163 | enum {
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164 | FB_VMODE_INTERLACED = 1, /* interlaced */
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165 | FB_VMODE_DOUBLE = 2, /* double scan */
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166 | FB_SYNC_HOR_HIGH_ACT = 1, /* horizontal sync high active */
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167 | FB_SYNC_VERT_HIGH_ACT = 2, /* vertical sync high active */
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168 | FB_SYNC_EXT = 4, /* external sync */
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169 | FB_SYNC_COMP_HIGH_ACT = 8 /* composite sync high active */
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170 | };
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171 | #endif
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172 |
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173 | static int readmode(struct fb_var_screeninfo *base, const char *fn,
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174 | const char *mode)
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175 | {
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176 | #if ENABLE_FEATURE_FBSET_READMODE
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177 | FILE *f;
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178 | char buf[256];
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179 | char *p = buf;
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180 |
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181 | f = xfopen(fn, "r");
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182 | while (!feof(f)) {
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183 | fgets(buf, sizeof(buf), f);
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184 | if (!(p = strstr(buf, "mode ")) && !(p = strstr(buf, "mode\t")))
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185 | continue;
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186 | p += 5;
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187 | if (!(p = strstr(buf, mode)))
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188 | continue;
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189 | p += strlen(mode);
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190 | if (!isspace(*p) && (*p != 0) && (*p != '"')
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191 | && (*p != '\r') && (*p != '\n'))
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192 | continue; /* almost, but not quite */
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193 |
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194 | while (!feof(f)) {
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195 | fgets(buf, sizeof(buf), f);
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196 | if ((p = strstr(buf, "geometry "))) {
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197 | p += 9;
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198 | /* FIXME: catastrophic on arches with 64bit ints */
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199 | sscanf(p, "%d %d %d %d %d",
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200 | &(base->xres), &(base->yres),
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201 | &(base->xres_virtual), &(base->yres_virtual),
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202 | &(base->bits_per_pixel));
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203 | } else if ((p = strstr(buf, "timings "))) {
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204 | p += 8;
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205 | sscanf(p, "%d %d %d %d %d %d %d",
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206 | &(base->pixclock),
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207 | &(base->left_margin), &(base->right_margin),
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208 | &(base->upper_margin), &(base->lower_margin),
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209 | &(base->hsync_len), &(base->vsync_len));
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210 | } else if ((p = strstr(buf, "laced "))) {
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211 | //p += 6;
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212 | if (strstr(buf, "false")) {
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213 | base->vmode &= ~FB_VMODE_INTERLACED;
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214 | } else {
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215 | base->vmode |= FB_VMODE_INTERLACED;
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216 | }
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217 | } else if ((p = strstr(buf, "double "))) {
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218 | //p += 7;
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219 | if (strstr(buf, "false")) {
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220 | base->vmode &= ~FB_VMODE_DOUBLE;
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221 | } else {
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222 | base->vmode |= FB_VMODE_DOUBLE;
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223 | }
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224 | } else if ((p = strstr(buf, "vsync "))) {
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225 | //p += 6;
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226 | if (strstr(buf, "low")) {
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227 | base->sync &= ~FB_SYNC_VERT_HIGH_ACT;
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228 | } else {
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229 | base->sync |= FB_SYNC_VERT_HIGH_ACT;
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230 | }
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231 | } else if ((p = strstr(buf, "hsync "))) {
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232 | //p += 6;
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233 | if (strstr(buf, "low")) {
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234 | base->sync &= ~FB_SYNC_HOR_HIGH_ACT;
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235 | } else {
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236 | base->sync |= FB_SYNC_HOR_HIGH_ACT;
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237 | }
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238 | } else if ((p = strstr(buf, "csync "))) {
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239 | //p += 6;
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240 | if (strstr(buf, "low")) {
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241 | base->sync &= ~FB_SYNC_COMP_HIGH_ACT;
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242 | } else {
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243 | base->sync |= FB_SYNC_COMP_HIGH_ACT;
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244 | }
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245 | } else if ((p = strstr(buf, "extsync "))) {
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246 | //p += 8;
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247 | if (strstr(buf, "false")) {
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248 | base->sync &= ~FB_SYNC_EXT;
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249 | } else {
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250 | base->sync |= FB_SYNC_EXT;
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251 | }
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252 | }
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253 |
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254 | if (strstr(buf, "endmode"))
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255 | return 1;
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256 | }
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257 | }
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258 | #else
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259 | bb_error_msg("mode reading not compiled in");
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260 | #endif
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261 | return 0;
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262 | }
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263 |
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264 | static inline void setmode(struct fb_var_screeninfo *base,
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265 | struct fb_var_screeninfo *set)
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266 | {
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267 | if ((int) set->xres > 0)
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268 | base->xres = set->xres;
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269 | if ((int) set->yres > 0)
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270 | base->yres = set->yres;
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271 | if ((int) set->xres_virtual > 0)
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272 | base->xres_virtual = set->xres_virtual;
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273 | if ((int) set->yres_virtual > 0)
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274 | base->yres_virtual = set->yres_virtual;
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275 | if ((int) set->bits_per_pixel > 0)
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276 | base->bits_per_pixel = set->bits_per_pixel;
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277 | }
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278 |
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279 | static inline void showmode(struct fb_var_screeninfo *v)
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280 | {
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281 | double drate = 0, hrate = 0, vrate = 0;
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282 |
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283 | if (v->pixclock) {
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284 | drate = 1e12 / v->pixclock;
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285 | hrate = drate / (v->left_margin + v->xres + v->right_margin + v->hsync_len);
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286 | vrate = hrate / (v->upper_margin + v->yres + v->lower_margin + v->vsync_len);
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287 | }
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288 | printf("\nmode \"%ux%u-%u\"\n"
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289 | #if ENABLE_FEATURE_FBSET_FANCY
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290 | "\t# D: %.3f MHz, H: %.3f kHz, V: %.3f Hz\n"
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291 | #endif
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292 | "\tgeometry %u %u %u %u %u\n"
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293 | "\ttimings %u %u %u %u %u %u %u\n"
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294 | "\taccel %s\n"
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295 | "\trgba %u/%u,%u/%u,%u/%u,%u/%u\n"
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296 | "endmode\n\n",
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297 | v->xres, v->yres, (int) (vrate + 0.5),
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298 | #if ENABLE_FEATURE_FBSET_FANCY
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299 | drate / 1e6, hrate / 1e3, vrate,
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300 | #endif
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301 | v->xres, v->yres, v->xres_virtual, v->yres_virtual, v->bits_per_pixel,
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302 | v->pixclock, v->left_margin, v->right_margin, v->upper_margin, v->lower_margin,
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303 | v->hsync_len, v->vsync_len,
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304 | (v->accel_flags > 0 ? "true" : "false"),
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305 | v->red.length, v->red.offset, v->green.length, v->green.offset,
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306 | v->blue.length, v->blue.offset, v->transp.length, v->transp.offset);
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307 | }
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308 |
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309 | #ifdef STANDALONE
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310 | int main(int argc, char **argv)
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311 | #else
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312 | int fbset_main(int argc, char **argv);
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313 | int fbset_main(int argc, char **argv)
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314 | #endif
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315 | {
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316 | struct fb_var_screeninfo var, varset;
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317 | int fh, i;
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318 | const char *fbdev = DEFAULTFBDEV;
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319 | const char *modefile = DEFAULTFBMODE;
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320 | char *thisarg, *mode = NULL;
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321 |
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322 | memset(&varset, 0xFF, sizeof(varset));
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323 |
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324 | /* parse cmd args.... why do they have to make things so difficult? */
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325 | argv++;
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326 | argc--;
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327 | for (; argc > 0 && (thisarg = *argv); argc--, argv++) {
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328 | for (i = 0; g_cmdoptions[i].name[0]; i++) {
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329 | if (strcmp(thisarg, g_cmdoptions[i].name))
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330 | continue;
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331 | if (argc-1 < g_cmdoptions[i].param_count)
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332 | bb_show_usage();
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333 |
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334 | switch (g_cmdoptions[i].code) {
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335 | case CMD_FB:
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336 | fbdev = argv[1];
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337 | break;
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338 | case CMD_DB:
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339 | modefile = argv[1];
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340 | break;
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341 | case CMD_GEOMETRY:
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342 | varset.xres = xatou32(argv[1]);
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343 | varset.yres = xatou32(argv[2]);
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344 | varset.xres_virtual = xatou32(argv[3]);
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345 | varset.yres_virtual = xatou32(argv[4]);
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346 | varset.bits_per_pixel = xatou32(argv[5]);
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347 | break;
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348 | case CMD_TIMING:
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349 | varset.pixclock = xatou32(argv[1]);
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350 | varset.left_margin = xatou32(argv[2]);
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351 | varset.right_margin = xatou32(argv[3]);
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352 | varset.upper_margin = xatou32(argv[4]);
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353 | varset.lower_margin = xatou32(argv[5]);
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354 | varset.hsync_len = xatou32(argv[6]);
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355 | varset.vsync_len = xatou32(argv[7]);
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356 | break;
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357 | case CMD_ALL:
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358 | g_options |= OPT_ALL;
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359 | break;
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360 | case CMD_CHANGE:
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361 | g_options |= OPT_CHANGE;
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362 | break;
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363 | #if ENABLE_FEATURE_FBSET_FANCY
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364 | case CMD_XRES:
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365 | varset.xres = xatou32(argv[1]);
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366 | break;
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367 | case CMD_YRES:
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368 | varset.yres = xatou32(argv[1]);
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369 | break;
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370 | case CMD_DEPTH:
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371 | varset.bits_per_pixel = xatou32(argv[1]);
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372 | break;
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373 | #endif
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374 | }
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375 | argc -= g_cmdoptions[i].param_count;
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376 | argv += g_cmdoptions[i].param_count;
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377 | break;
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378 | }
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379 | if (!g_cmdoptions[i].name[0]) {
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380 | if (argc != 1)
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381 | bb_show_usage();
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382 | mode = *argv;
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383 | g_options |= OPT_READMODE;
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384 | }
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385 | }
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386 |
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387 | fh = xopen(fbdev, O_RDONLY);
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388 | xioctl(fh, FBIOGET_VSCREENINFO, &var);
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389 | if (g_options & OPT_READMODE) {
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390 | if (!readmode(&var, modefile, mode)) {
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391 | bb_error_msg_and_die("unknown video mode '%s'", mode);
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392 | }
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393 | }
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394 |
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395 | setmode(&var, &varset);
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396 | if (g_options & OPT_CHANGE) {
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397 | if (g_options & OPT_ALL)
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398 | var.activate = FB_ACTIVATE_ALL;
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399 | xioctl(fh, FBIOPUT_VSCREENINFO, &var);
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400 | }
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401 | showmode(&var);
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402 | /* Don't close the file, as exiting will take care of that */
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403 | /* close(fh); */
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404 |
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405 | return EXIT_SUCCESS;
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406 | }
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