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 source tree.
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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 | /* Stuff stolen from the kernel's fb.h */
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21 | #define FB_ACTIVATE_ALL 64
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22 | enum {
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23 | FBIOGET_VSCREENINFO = 0x4600,
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24 | FBIOPUT_VSCREENINFO = 0x4601
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25 | };
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26 |
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27 | struct fb_bitfield {
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28 | uint32_t offset; /* beginning of bitfield */
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29 | uint32_t length; /* length of bitfield */
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30 | uint32_t msb_right; /* !=0: Most significant bit is right */
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31 | };
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32 | struct fb_var_screeninfo {
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33 | uint32_t xres; /* visible resolution */
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34 | uint32_t yres;
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35 | uint32_t xres_virtual; /* virtual resolution */
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36 | uint32_t yres_virtual;
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37 | uint32_t xoffset; /* offset from virtual to visible */
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38 | uint32_t yoffset; /* resolution */
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39 |
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40 | uint32_t bits_per_pixel;
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41 | uint32_t grayscale; /* !=0 Graylevels instead of colors */
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42 |
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43 | struct fb_bitfield red; /* bitfield in fb mem if true color, */
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44 | struct fb_bitfield green; /* else only length is significant */
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45 | struct fb_bitfield blue;
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46 | struct fb_bitfield transp; /* transparency */
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47 |
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48 | uint32_t nonstd; /* !=0 Non standard pixel format */
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49 |
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50 | uint32_t activate; /* see FB_ACTIVATE_x */
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51 |
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52 | uint32_t height; /* height of picture in mm */
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53 | uint32_t width; /* width of picture in mm */
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54 |
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55 | uint32_t accel_flags; /* acceleration flags (hints) */
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56 |
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57 | /* Timing: All values in pixclocks, except pixclock (of course) */
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58 | uint32_t pixclock; /* pixel clock in ps (pico seconds) */
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59 | uint32_t left_margin; /* time from sync to picture */
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60 | uint32_t right_margin; /* time from picture to sync */
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61 | uint32_t upper_margin; /* time from sync to picture */
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62 | uint32_t lower_margin;
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63 | uint32_t hsync_len; /* length of horizontal sync */
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64 | uint32_t vsync_len; /* length of vertical sync */
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65 | uint32_t sync; /* see FB_SYNC_x */
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66 | uint32_t vmode; /* see FB_VMODE_x */
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67 | uint32_t reserved[6]; /* Reserved for future compatibility */
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68 | };
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69 |
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70 | static void copy_if_gt0(uint32_t *src, uint32_t *dst, unsigned cnt)
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71 | {
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72 | do {
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73 | if ((int32_t) *src > 0)
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74 | *dst = *src;
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75 | src++;
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76 | dst++;
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77 | } while (--cnt);
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78 | }
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79 |
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80 | static NOINLINE void copy_changed_values(
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81 | struct fb_var_screeninfo *base,
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82 | struct fb_var_screeninfo *set)
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83 | {
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84 | //if ((int32_t) set->xres > 0) base->xres = set->xres;
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85 | //if ((int32_t) set->yres > 0) base->yres = set->yres;
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86 | //if ((int32_t) set->xres_virtual > 0) base->xres_virtual = set->xres_virtual;
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87 | //if ((int32_t) set->yres_virtual > 0) base->yres_virtual = set->yres_virtual;
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88 | copy_if_gt0(&set->xres, &base->xres, 4);
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89 |
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90 | if ((int32_t) set->bits_per_pixel > 0) base->bits_per_pixel = set->bits_per_pixel;
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91 | //copy_if_gt0(&set->bits_per_pixel, &base->bits_per_pixel, 1);
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92 |
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93 | //if ((int32_t) set->pixclock > 0) base->pixclock = set->pixclock;
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94 | //if ((int32_t) set->left_margin > 0) base->left_margin = set->left_margin;
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95 | //if ((int32_t) set->right_margin > 0) base->right_margin = set->right_margin;
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96 | //if ((int32_t) set->upper_margin > 0) base->upper_margin = set->upper_margin;
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97 | //if ((int32_t) set->lower_margin > 0) base->lower_margin = set->lower_margin;
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98 | //if ((int32_t) set->hsync_len > 0) base->hsync_len = set->hsync_len;
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99 | //if ((int32_t) set->vsync_len > 0) base->vsync_len = set->vsync_len;
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100 | //if ((int32_t) set->sync > 0) base->sync = set->sync;
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101 | //if ((int32_t) set->vmode > 0) base->vmode = set->vmode;
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102 | copy_if_gt0(&set->pixclock, &base->pixclock, 9);
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103 | }
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104 |
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105 |
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106 | enum {
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107 | CMD_FB = 1,
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108 | CMD_DB = 2,
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109 | CMD_GEOMETRY = 3,
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110 | CMD_TIMING = 4,
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111 | CMD_ACCEL = 5,
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112 | CMD_HSYNC = 6,
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113 | CMD_VSYNC = 7,
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114 | CMD_LACED = 8,
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115 | CMD_DOUBLE = 9,
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116 | /* CMD_XCOMPAT = 10, */
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117 | CMD_ALL = 11,
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118 | CMD_INFO = 12,
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119 | CMD_SHOW = 13,
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120 | CMD_CHANGE = 14,
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121 |
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122 | #if ENABLE_FEATURE_FBSET_FANCY
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123 | CMD_XRES = 100,
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124 | CMD_YRES = 101,
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125 | CMD_VXRES = 102,
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126 | CMD_VYRES = 103,
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127 | CMD_DEPTH = 104,
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128 | CMD_MATCH = 105,
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129 | CMD_PIXCLOCK = 106,
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130 | CMD_LEFT = 107,
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131 | CMD_RIGHT = 108,
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132 | CMD_UPPER = 109,
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133 | CMD_LOWER = 110,
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134 | CMD_HSLEN = 111,
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135 | CMD_VSLEN = 112,
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136 | CMD_CSYNC = 113,
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137 | CMD_GSYNC = 114,
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138 | CMD_EXTSYNC = 115,
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139 | CMD_BCAST = 116,
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140 | CMD_RGBA = 117,
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141 | CMD_STEP = 118,
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142 | CMD_MOVE = 119,
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143 | #endif
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144 | };
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145 |
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146 | static const struct cmdoptions_t {
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147 | const char name[9];
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148 | const unsigned char param_count;
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149 | const unsigned char code;
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150 | } g_cmdoptions[] = {
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151 | /*"12345678" + NUL */
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152 | { "fb" , 1, CMD_FB },
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153 | { "db" , 1, CMD_DB },
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154 | { "a" , 0, CMD_ALL },
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155 | { "i" , 0, CMD_INFO },
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156 | { "g" , 5, CMD_GEOMETRY },
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157 | { "t" , 7, CMD_TIMING },
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158 | { "accel" , 1, CMD_ACCEL },
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159 | { "hsync" , 1, CMD_HSYNC },
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160 | { "vsync" , 1, CMD_VSYNC },
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161 | { "laced" , 1, CMD_LACED },
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162 | { "double" , 1, CMD_DOUBLE },
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163 | { "show" , 0, CMD_SHOW },
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164 | { "s" , 0, CMD_SHOW },
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165 | #if ENABLE_FEATURE_FBSET_FANCY
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166 | { "all" , 0, CMD_ALL },
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167 | { "xres" , 1, CMD_XRES },
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168 | { "yres" , 1, CMD_YRES },
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169 | { "vxres" , 1, CMD_VXRES },
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170 | { "vyres" , 1, CMD_VYRES },
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171 | { "depth" , 1, CMD_DEPTH },
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172 | { "match" , 0, CMD_MATCH },
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173 | { "geometry", 5, CMD_GEOMETRY },
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174 | { "pixclock", 1, CMD_PIXCLOCK },
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175 | { "left" , 1, CMD_LEFT },
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176 | { "right" , 1, CMD_RIGHT },
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177 | { "upper" , 1, CMD_UPPER },
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178 | { "lower" , 1, CMD_LOWER },
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179 | { "hslen" , 1, CMD_HSLEN },
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180 | { "vslen" , 1, CMD_VSLEN },
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181 | { "timings" , 7, CMD_TIMING },
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182 | { "csync" , 1, CMD_CSYNC },
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183 | { "gsync" , 1, CMD_GSYNC },
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184 | { "extsync" , 1, CMD_EXTSYNC },
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185 | { "bcast" , 1, CMD_BCAST },
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186 | { "rgba" , 1, CMD_RGBA },
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187 | { "step" , 1, CMD_STEP },
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188 | { "move" , 1, CMD_MOVE },
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189 | #endif
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190 | };
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191 |
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192 | /* taken from linux/fb.h */
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193 | enum {
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194 | FB_SYNC_HOR_HIGH_ACT = 1, /* horizontal sync high active */
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195 | FB_SYNC_VERT_HIGH_ACT = 2, /* vertical sync high active */
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196 | #if ENABLE_FEATURE_FBSET_READMODE
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197 | FB_VMODE_INTERLACED = 1, /* interlaced */
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198 | FB_VMODE_DOUBLE = 2, /* double scan */
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199 | FB_SYNC_EXT = 4, /* external sync */
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200 | FB_SYNC_COMP_HIGH_ACT = 8, /* composite sync high active */
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201 | #endif
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202 | };
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203 |
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204 | #if ENABLE_FEATURE_FBSET_READMODE
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205 | static void ss(uint32_t *x, uint32_t flag, char *buf, const char *what)
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206 | {
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207 | if (strcmp(buf, what) == 0)
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208 | *x &= ~flag;
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209 | else
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210 | *x |= flag;
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211 | }
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212 |
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213 | /* Mode db file contains mode definitions like this:
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214 | * mode "800x600-48-lace"
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215 | * # D: 36.00 MHz, H: 33.835 kHz, V: 96.39 Hz
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216 | * geometry 800 600 800 600 8
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217 | * timings 27778 56 80 79 11 128 12
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218 | * laced true
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219 | * hsync high
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220 | * vsync high
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221 | * endmode
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222 | */
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223 | static int read_mode_db(struct fb_var_screeninfo *base, const char *fn,
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224 | const char *mode)
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225 | {
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226 | char *token[2], *p, *s;
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227 | parser_t *parser = config_open(fn);
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228 |
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229 | while (config_read(parser, token, 2, 1, "# \t\r", PARSE_NORMAL)) {
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230 | if (strcmp(token[0], "mode") != 0 || !token[1])
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231 | continue;
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232 | p = strstr(token[1], mode);
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233 | if (!p)
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234 | continue;
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235 | s = p + strlen(mode);
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236 | //bb_info_msg("CHECK[%s][%s][%d]", mode, p-1, *s);
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237 | /* exact match? */
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238 | if (((!*s || isspace(*s)) && '"' != s[-1]) /* end-of-token */
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239 | || ('"' == *s && '"' == p[-1]) /* ends with " but starts with " too! */
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240 | ) {
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241 | //bb_info_msg("FOUND[%s][%s][%s][%d]", token[1], p, mode, isspace(*s));
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242 | break;
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243 | }
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244 | }
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245 |
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246 | if (!token[0])
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247 | return 0;
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248 |
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249 | while (config_read(parser, token, 2, 1, "# \t", PARSE_NORMAL)) {
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250 | int i;
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251 |
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252 | //bb_info_msg("???[%s][%s]", token[0], token[1]);
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253 | if (strcmp(token[0], "endmode") == 0) {
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254 | //bb_info_msg("OK[%s]", mode);
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255 | return 1;
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256 | }
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257 | p = token[1];
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258 | i = index_in_strings(
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259 | "geometry\0timings\0interlaced\0double\0vsync\0hsync\0csync\0extsync\0",
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260 | token[0]);
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261 | switch (i) {
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262 | case 0:
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263 | if (sizeof(int) == sizeof(base->xres)) {
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264 | sscanf(p, "%d %d %d %d %d",
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265 | &base->xres, &base->yres,
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266 | &base->xres_virtual, &base->yres_virtual,
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267 | &base->bits_per_pixel);
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268 | } else {
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269 | int base_xres, base_yres;
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270 | int base_xres_virtual, base_yres_virtual;
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271 | int base_bits_per_pixel;
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272 | sscanf(p, "%d %d %d %d %d",
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273 | &base_xres, &base_yres,
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274 | &base_xres_virtual, &base_yres_virtual,
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275 | &base_bits_per_pixel);
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276 | base->xres = base_xres;
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277 | base->yres = base_yres;
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278 | base->xres_virtual = base_xres_virtual;
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279 | base->yres_virtual = base_yres_virtual;
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280 | base->bits_per_pixel = base_bits_per_pixel;
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281 | }
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282 | //bb_info_msg("GEO[%s]", p);
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283 | break;
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284 | case 1:
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285 | if (sizeof(int) == sizeof(base->xres)) {
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286 | sscanf(p, "%d %d %d %d %d %d %d",
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287 | &base->pixclock,
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288 | &base->left_margin, &base->right_margin,
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289 | &base->upper_margin, &base->lower_margin,
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290 | &base->hsync_len, &base->vsync_len);
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291 | } else {
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292 | int base_pixclock;
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293 | int base_left_margin, base_right_margin;
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294 | int base_upper_margin, base_lower_margin;
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295 | int base_hsync_len, base_vsync_len;
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296 | sscanf(p, "%d %d %d %d %d %d %d",
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297 | &base_pixclock,
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298 | &base_left_margin, &base_right_margin,
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299 | &base_upper_margin, &base_lower_margin,
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300 | &base_hsync_len, &base_vsync_len);
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301 | base->pixclock = base_pixclock;
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302 | base->left_margin = base_left_margin;
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303 | base->right_margin = base_right_margin;
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304 | base->upper_margin = base_upper_margin;
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305 | base->lower_margin = base_lower_margin;
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306 | base->hsync_len = base_hsync_len;
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307 | base->vsync_len = base_vsync_len;
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308 | }
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309 | //bb_info_msg("TIM[%s]", p);
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310 | break;
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311 | case 2:
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312 | case 3: {
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313 | static const uint32_t syncs[] = {FB_VMODE_INTERLACED, FB_VMODE_DOUBLE};
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314 | ss(&base->vmode, syncs[i-2], p, "false");
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315 | //bb_info_msg("VMODE[%s]", p);
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316 | break;
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317 | }
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318 | case 4:
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319 | case 5:
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320 | case 6: {
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321 | static const uint32_t syncs[] = {FB_SYNC_VERT_HIGH_ACT, FB_SYNC_HOR_HIGH_ACT, FB_SYNC_COMP_HIGH_ACT};
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322 | ss(&base->sync, syncs[i-4], p, "low");
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323 | //bb_info_msg("SYNC[%s]", p);
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324 | break;
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325 | }
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326 | case 7:
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327 | ss(&base->sync, FB_SYNC_EXT, p, "false");
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328 | //bb_info_msg("EXTSYNC[%s]", p);
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329 | break;
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330 | }
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331 | }
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332 | return 0;
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333 | }
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334 | #endif
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335 |
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336 | static NOINLINE void showmode(struct fb_var_screeninfo *v)
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337 | {
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338 | double drate = 0, hrate = 0, vrate = 0;
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339 |
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340 | if (v->pixclock) {
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341 | drate = 1e12 / v->pixclock;
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342 | hrate = drate / (v->left_margin + v->xres + v->right_margin + v->hsync_len);
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343 | vrate = hrate / (v->upper_margin + v->yres + v->lower_margin + v->vsync_len);
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344 | }
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345 | printf("\nmode \"%ux%u-%u\"\n"
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346 | #if ENABLE_FEATURE_FBSET_FANCY
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347 | "\t# D: %.3f MHz, H: %.3f kHz, V: %.3f Hz\n"
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348 | #endif
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349 | "\tgeometry %u %u %u %u %u\n"
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350 | "\ttimings %u %u %u %u %u %u %u\n"
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351 | "\taccel %s\n"
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352 | "\trgba %u/%u,%u/%u,%u/%u,%u/%u\n"
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353 | "endmode\n\n",
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354 | v->xres, v->yres, (int) (vrate + 0.5),
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355 | #if ENABLE_FEATURE_FBSET_FANCY
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356 | drate / 1e6, hrate / 1e3, vrate,
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357 | #endif
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358 | v->xres, v->yres, v->xres_virtual, v->yres_virtual, v->bits_per_pixel,
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359 | v->pixclock, v->left_margin, v->right_margin, v->upper_margin, v->lower_margin,
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360 | v->hsync_len, v->vsync_len,
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361 | (v->accel_flags > 0 ? "true" : "false"),
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362 | v->red.length, v->red.offset, v->green.length, v->green.offset,
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363 | v->blue.length, v->blue.offset, v->transp.length, v->transp.offset);
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364 | }
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365 |
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366 | int fbset_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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367 | int fbset_main(int argc, char **argv)
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368 | {
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369 | enum {
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370 | OPT_CHANGE = (1 << 0),
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371 | OPT_SHOW = (1 << 1),
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372 | OPT_READMODE = (1 << 2),
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373 | OPT_ALL = (1 << 9),
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374 | };
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375 | struct fb_var_screeninfo var_old, var_set;
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376 | int fh, i;
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377 | unsigned options = 0;
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378 |
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379 | const char *fbdev = DEFAULTFBDEV;
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380 | const char *modefile = DEFAULTFBMODE;
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381 | char *thisarg;
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382 | char *mode = mode; /* for compiler */
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383 |
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384 | memset(&var_set, 0xff, sizeof(var_set)); /* set all to -1 */
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385 |
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386 | /* parse cmd args.... why do they have to make things so difficult? */
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387 | argv++;
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388 | argc--;
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389 | for (; argc > 0 && (thisarg = *argv) != NULL; argc--, argv++) {
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390 | if (thisarg[0] == '-') for (i = 0; i < ARRAY_SIZE(g_cmdoptions); i++) {
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391 | if (strcmp(thisarg + 1, g_cmdoptions[i].name) != 0)
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392 | continue;
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393 | if (argc <= g_cmdoptions[i].param_count)
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394 | bb_show_usage();
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395 |
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396 | switch (g_cmdoptions[i].code) {
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397 | case CMD_FB:
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398 | fbdev = argv[1];
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399 | break;
|
---|
400 | case CMD_DB:
|
---|
401 | modefile = argv[1];
|
---|
402 | break;
|
---|
403 | case CMD_ALL:
|
---|
404 | options |= OPT_ALL;
|
---|
405 | break;
|
---|
406 | case CMD_SHOW:
|
---|
407 | options |= OPT_SHOW;
|
---|
408 | break;
|
---|
409 | case CMD_GEOMETRY:
|
---|
410 | var_set.xres = xatou32(argv[1]);
|
---|
411 | var_set.yres = xatou32(argv[2]);
|
---|
412 | var_set.xres_virtual = xatou32(argv[3]);
|
---|
413 | var_set.yres_virtual = xatou32(argv[4]);
|
---|
414 | var_set.bits_per_pixel = xatou32(argv[5]);
|
---|
415 | break;
|
---|
416 | case CMD_TIMING:
|
---|
417 | var_set.pixclock = xatou32(argv[1]);
|
---|
418 | var_set.left_margin = xatou32(argv[2]);
|
---|
419 | var_set.right_margin = xatou32(argv[3]);
|
---|
420 | var_set.upper_margin = xatou32(argv[4]);
|
---|
421 | var_set.lower_margin = xatou32(argv[5]);
|
---|
422 | var_set.hsync_len = xatou32(argv[6]);
|
---|
423 | var_set.vsync_len = xatou32(argv[7]);
|
---|
424 | break;
|
---|
425 | case CMD_ACCEL:
|
---|
426 | break;
|
---|
427 | case CMD_HSYNC:
|
---|
428 | var_set.sync |= FB_SYNC_HOR_HIGH_ACT;
|
---|
429 | break;
|
---|
430 | case CMD_VSYNC:
|
---|
431 | var_set.sync |= FB_SYNC_VERT_HIGH_ACT;
|
---|
432 | break;
|
---|
433 | #if ENABLE_FEATURE_FBSET_FANCY
|
---|
434 | case CMD_XRES:
|
---|
435 | var_set.xres = xatou32(argv[1]);
|
---|
436 | break;
|
---|
437 | case CMD_YRES:
|
---|
438 | var_set.yres = xatou32(argv[1]);
|
---|
439 | break;
|
---|
440 | case CMD_DEPTH:
|
---|
441 | var_set.bits_per_pixel = xatou32(argv[1]);
|
---|
442 | break;
|
---|
443 | #endif
|
---|
444 | }
|
---|
445 | switch (g_cmdoptions[i].code) {
|
---|
446 | case CMD_FB:
|
---|
447 | case CMD_DB:
|
---|
448 | case CMD_ALL:
|
---|
449 | case CMD_SHOW:
|
---|
450 | break;
|
---|
451 | default:
|
---|
452 | /* other commands imply changes */
|
---|
453 | options |= OPT_CHANGE;
|
---|
454 | }
|
---|
455 | argc -= g_cmdoptions[i].param_count;
|
---|
456 | argv += g_cmdoptions[i].param_count;
|
---|
457 | goto contin;
|
---|
458 | }
|
---|
459 | if (!ENABLE_FEATURE_FBSET_READMODE || argc != 1)
|
---|
460 | bb_show_usage();
|
---|
461 | mode = *argv;
|
---|
462 | options |= OPT_READMODE;
|
---|
463 | contin: ;
|
---|
464 | }
|
---|
465 |
|
---|
466 | fh = xopen(fbdev, O_RDONLY);
|
---|
467 | xioctl(fh, FBIOGET_VSCREENINFO, &var_old);
|
---|
468 |
|
---|
469 | if (options & OPT_READMODE) {
|
---|
470 | #if ENABLE_FEATURE_FBSET_READMODE
|
---|
471 | if (!read_mode_db(&var_old, modefile, mode)) {
|
---|
472 | bb_error_msg_and_die("unknown video mode '%s'", mode);
|
---|
473 | }
|
---|
474 | #endif
|
---|
475 | }
|
---|
476 |
|
---|
477 | if (options & OPT_CHANGE) {
|
---|
478 | copy_changed_values(&var_old, &var_set);
|
---|
479 | if (options & OPT_ALL)
|
---|
480 | var_old.activate = FB_ACTIVATE_ALL;
|
---|
481 | xioctl(fh, FBIOPUT_VSCREENINFO, &var_old);
|
---|
482 | }
|
---|
483 |
|
---|
484 | if (options == 0 || (options & OPT_SHOW))
|
---|
485 | showmode(&var_old);
|
---|
486 |
|
---|
487 | if (ENABLE_FEATURE_CLEAN_UP)
|
---|
488 | close(fh);
|
---|
489 |
|
---|
490 | return EXIT_SUCCESS;
|
---|
491 | }
|
---|