util-linux/fbset.c

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