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 "busybox.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 #ifdef CONFIG_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 int g_options = 0;
  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 */
  76                                         /* right */
  77 };
  78 struct fb_var_screeninfo {
  79         uint32_t xres;                  /* visible resolution           */
  80         uint32_t yres;
  81         uint32_t xres_virtual;          /* virtual resolution           */
  82         uint32_t yres_virtual;
  83         uint32_t xoffset;                       /* offset from virtual to visible */
  84         uint32_t yoffset;                       /* resolution                   */
  85
  86         uint32_t bits_per_pixel;                /* guess what                   */
  87         uint32_t grayscale;             /* != 0 Graylevels instead of colors */
  88
  89         struct fb_bitfield red;         /* bitfield in fb mem if true color, */
  90         struct fb_bitfield green;       /* else only length is significant */
  91         struct fb_bitfield blue;
  92         struct fb_bitfield transp;      /* transparency                 */
  93
  94         uint32_t nonstd;                        /* != 0 Non standard pixel format */
  95
  96         uint32_t activate;                      /* see FB_ACTIVATE_*            */
  97
  98         uint32_t height;                        /* height of picture in mm    */
  99         uint32_t width;                 /* width of picture in mm     */
 100
 101         uint32_t accel_flags;           /* acceleration flags (hints)   */
 102
 103         /* Timing: All values in pixclocks, except pixclock (of course) */
 104         uint32_t pixclock;                      /* pixel clock in ps (pico seconds) */
 105         uint32_t left_margin;           /* time from sync to picture    */
 106         uint32_t right_margin;          /* time from picture to sync    */
 107         uint32_t upper_margin;          /* time from sync to picture    */
 108         uint32_t lower_margin;
 109         uint32_t hsync_len;             /* length of horizontal sync    */
 110         uint32_t vsync_len;             /* length of vertical sync      */
 111         uint32_t sync;                  /* see FB_SYNC_*                */
 112         uint32_t vmode;                 /* see FB_VMODE_*               */
 113         uint32_t reserved[6];           /* Reserved for future compatibility */
 114 };
 115
 116
 117 static const struct cmdoptions_t {
 118         const char *name;
 119         const unsigned char param_count;
 120         const unsigned char code;
 121 } g_cmdoptions[] = {
 122         {
 123         "-fb", 1, CMD_FB}, {
 124         "-db", 1, CMD_DB}, {
 125         "-a", 0, CMD_ALL}, {
 126         "-i", 0, CMD_INFO}, {
 127         "-g", 5, CMD_GEOMETRY}, {
 128         "-t", 7, CMD_TIMING}, {
 129         "-accel", 1, CMD_ACCEL}, {
 130         "-hsync", 1, CMD_HSYNC}, {
 131         "-vsync", 1, CMD_VSYNC}, {
 132         "-laced", 1, CMD_LACED}, {
 133         "-double", 1, CMD_DOUBLE}, {
 134         "-n", 0, CMD_CHANGE}, {
 135 #ifdef CONFIG_FEATURE_FBSET_FANCY
 136         "-all", 0, CMD_ALL}, {
 137         "-xres", 1, CMD_XRES}, {
 138         "-yres", 1, CMD_YRES}, {
 139         "-vxres", 1, CMD_VXRES}, {
 140         "-vyres", 1, CMD_VYRES}, {
 141         "-depth", 1, CMD_DEPTH}, {
 142         "-match", 0, CMD_MATCH}, {
 143         "-geometry", 5, CMD_GEOMETRY}, {
 144         "-pixclock", 1, CMD_PIXCLOCK}, {
 145         "-left", 1, CMD_LEFT}, {
 146         "-right", 1, CMD_RIGHT}, {
 147         "-upper", 1, CMD_UPPER}, {
 148         "-lower", 1, CMD_LOWER}, {
 149         "-hslen", 1, CMD_HSLEN}, {
 150         "-vslen", 1, CMD_VSLEN}, {
 151         "-timings", 7, CMD_TIMING}, {
 152         "-csync", 1, CMD_CSYNC}, {
 153         "-gsync", 1, CMD_GSYNC}, {
 154         "-extsync", 1, CMD_EXTSYNC}, {
 155         "-bcast", 1, CMD_BCAST}, {
 156         "-rgba", 1, CMD_RGBA}, {
 157         "-step", 1, CMD_STEP}, {
 158         "-move", 1, CMD_MOVE}, {
 159 #endif
 160         0, 0, 0}
 161 };
 162
 163 #ifdef CONFIG_FEATURE_FBSET_READMODE
 164 /* taken from linux/fb.h */
 165 enum {
 166         FB_VMODE_INTERLACED = 1,        /* interlaced   */
 167         FB_VMODE_DOUBLE = 2,    /* double scan */
 168         FB_SYNC_HOR_HIGH_ACT = 1,       /* horizontal sync high active  */
 169         FB_SYNC_VERT_HIGH_ACT = 2,      /* vertical sync high active    */
 170         FB_SYNC_EXT = 4,        /* external sync                */
 171         FB_SYNC_COMP_HIGH_ACT = 8       /* composite sync high active   */
 172 };
 173 #endif
 174 static int readmode(struct fb_var_screeninfo *base, const char *fn,
 175                                         const char *mode)
 176 {
 177 #ifdef CONFIG_FEATURE_FBSET_READMODE
 178         FILE *f;
 179         char buf[256];
 180         char *p = buf;
 181
 182         f = xfopen(fn, "r");
 183         while (!feof(f)) {
 184                 fgets(buf, sizeof(buf), f);
 185                 if ((p = strstr(buf, "mode ")) || (p = strstr(buf, "mode\t"))) {
 186                         p += 5;
 187                         if ((p = strstr(buf, mode))) {
 188                                 p += strlen(mode);
 189                                 if (!isspace(*p) && (*p != 0) && (*p != '"')
 190                                         && (*p != '\r') && (*p != '\n'))
 191                                         continue;       /* almost, but not quite */
 192                                 while (!feof(f)) {
 193                                         fgets(buf, sizeof(buf), f);
 194
 195                     if ((p = strstr(buf, "geometry "))) {
 196                         p += 9;
 197
 198                         sscanf(p, "%d %d %d %d %d",
 199                                 &(base->xres), &(base->yres),
 200                                 &(base->xres_virtual), &(base->yres_virtual),
 201                                 &(base->bits_per_pixel));
 202                     } else if ((p = strstr(buf, "timings "))) {
 203                         p += 8;
 204
 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
 213                         if (strstr(buf, "false")) {
 214                             base->vmode &= ~FB_VMODE_INTERLACED;
 215                         } else {
 216                             base->vmode |= FB_VMODE_INTERLACED;
 217                         }
 218                     } else if ((p = strstr(buf, "double "))) {
 219                         p += 7;
 220
 221                         if (strstr(buf, "false")) {
 222                             base->vmode &= ~FB_VMODE_DOUBLE;
 223                         } else {
 224                             base->vmode |= FB_VMODE_DOUBLE;
 225                         }
 226                     } else if ((p = strstr(buf, "vsync "))) {
 227                         p += 6;
 228
 229                         if (strstr(buf, "low")) {
 230                             base->sync &= ~FB_SYNC_VERT_HIGH_ACT;
 231                         } else {
 232                             base->sync |= FB_SYNC_VERT_HIGH_ACT;
 233                         }
 234                     } else if ((p = strstr(buf, "hsync "))) {
 235                         p += 6;
 236
 237                         if (strstr(buf, "low")) {
 238                             base->sync &= ~FB_SYNC_HOR_HIGH_ACT;
 239                         } else {
 240                             base->sync |= FB_SYNC_HOR_HIGH_ACT;
 241                         }
 242                     } else if ((p = strstr(buf, "csync "))) {
 243                         p += 6;
 244
 245                         if (strstr(buf, "low")) {
 246                             base->sync &= ~FB_SYNC_COMP_HIGH_ACT;
 247                         } else {
 248                             base->sync |= FB_SYNC_COMP_HIGH_ACT;
 249                         }
 250                     } else if ((p = strstr(buf, "extsync "))) {
 251                         p += 8;
 252
 253                         if (strstr(buf, "false")) {
 254                             base->sync &= ~FB_SYNC_EXT;
 255                         } else {
 256                             base->sync |= FB_SYNC_EXT;
 257                         }
 258                     }
 259
 260                                         if (strstr(buf, "endmode"))
 261                                                 return 1;
 262                                 }
 263                         }
 264                 }
 265         }
 266 #else
 267         bb_error_msg( "mode reading not compiled in");
 268 #endif
 269         return 0;
 270 }
 271
 272 static inline void setmode(struct fb_var_screeninfo *base,
 273                                         struct fb_var_screeninfo *set)
 274 {
 275         if ((int) set->xres > 0)
 276                 base->xres = set->xres;
 277         if ((int) set->yres > 0)
 278                 base->yres = set->yres;
 279         if ((int) set->xres_virtual > 0)
 280                 base->xres_virtual = set->xres_virtual;
 281         if ((int) set->yres_virtual > 0)
 282                 base->yres_virtual = set->yres_virtual;
 283         if ((int) set->bits_per_pixel > 0)
 284                 base->bits_per_pixel = set->bits_per_pixel;
 285 }
 286
 287 static inline void showmode(struct fb_var_screeninfo *v)
 288 {
 289         double drate = 0, hrate = 0, vrate = 0;
 290
 291         if (v->pixclock) {
 292                 drate = 1e12 / v->pixclock;
 293                 hrate =
 294                         drate / (v->left_margin + v->xres + v->right_margin +
 295                                          v->hsync_len);
 296                 vrate =
 297                         hrate / (v->upper_margin + v->yres + v->lower_margin +
 298                                          v->vsync_len);
 299         }
 300         printf("\nmode \"%ux%u-%u\"\n"
 301 #ifdef CONFIG_FEATURE_FBSET_FANCY
 302         "\t# D: %.3f MHz, H: %.3f kHz, V: %.3f Hz\n"
 303 #endif
 304         "\tgeometry %u %u %u %u %u\n\ttimings %u %u %u %u %u %u %u\n\taccel %s\n\trgba %u/%u,%u/%u,%u/%u,%u/%u\nendmode\n\n",
 305                    v->xres, v->yres, (int) (vrate + 0.5),
 306 #ifdef CONFIG_FEATURE_FBSET_FANCY
 307                    drate / 1e6, hrate / 1e3, vrate,
 308 #endif
 309                    v->xres, v->yres, v->xres_virtual, v->yres_virtual,
 310                    v->bits_per_pixel, v->pixclock, v->left_margin,
 311                    v->right_margin, v->upper_margin, v->lower_margin, v->hsync_len,
 312                    v->vsync_len, (v->accel_flags > 0 ? "true" : "false"), v->red.length,
 313                    v->red.offset, v->green.length, v->green.offset, v->blue.length,
 314                    v->blue.offset, v->transp.length, v->transp.offset);
 315 }
 316
 317 #ifdef STANDALONE
 318 int main(int argc, char **argv)
 319 #else
 320 int fbset_main(int argc, char **argv)
 321 #endif
 322 {
 323         struct fb_var_screeninfo var, varset;
 324         int fh, i;
 325         char *fbdev = DEFAULTFBDEV;
 326         char *modefile = DEFAULTFBMODE;
 327         char *thisarg, *mode = NULL;
 328
 329         memset(&varset, 0xFF, sizeof(varset));
 330
 331         /* parse cmd args.... why do they have to make things so difficult? */
 332         argv++;
 333         argc--;
 334         for (; argc > 0 && (thisarg = *argv); argc--, argv++) {
 335                 for (i = 0; g_cmdoptions[i].name; i++) {
 336                         if (!strcmp(thisarg, g_cmdoptions[i].name)) {
 337                                 if (argc - 1 < g_cmdoptions[i].param_count)
 338                                         bb_show_usage();
 339                                 switch (g_cmdoptions[i].code) {
 340                                 case CMD_FB:
 341                                         fbdev = argv[1];
 342                                         break;
 343                                 case CMD_DB:
 344                                         modefile = argv[1];
 345                                         break;
 346                                 case CMD_GEOMETRY:
 347                                         varset.xres = strtoul(argv[1], 0, 0);
 348                                         varset.yres = strtoul(argv[2], 0, 0);
 349                                         varset.xres_virtual = strtoul(argv[3], 0, 0);
 350                                         varset.yres_virtual = strtoul(argv[4], 0, 0);
 351                                         varset.bits_per_pixel = strtoul(argv[5], 0, 0);
 352                                         break;
 353                                 case CMD_TIMING:
 354                                         varset.pixclock = strtoul(argv[1], 0, 0);
 355                                         varset.left_margin = strtoul(argv[2], 0, 0);
 356                                         varset.right_margin = strtoul(argv[3], 0, 0);
 357                                         varset.upper_margin = strtoul(argv[4], 0, 0);
 358                                         varset.lower_margin = strtoul(argv[5], 0, 0);
 359                                         varset.hsync_len = strtoul(argv[6], 0, 0);
 360                                         varset.vsync_len = strtoul(argv[7], 0, 0);
 361                                         break;
 362                                 case CMD_ALL:
 363                                         g_options |= OPT_ALL;
 364                                         break;
 365                                 case CMD_CHANGE:
 366                                         g_options |= OPT_CHANGE;
 367                                         break;
 368 #ifdef CONFIG_FEATURE_FBSET_FANCY
 369                                 case CMD_XRES:
 370                                         varset.xres = strtoul(argv[1], 0, 0);
 371                                         break;
 372                                 case CMD_YRES:
 373                                         varset.yres = strtoul(argv[1], 0, 0);
 374                                         break;
 375                                 case CMD_DEPTH:
 376                                         varset.bits_per_pixel = strtoul(argv[1], 0, 0);
 377                                         break;
 378 #endif
 379                                 }
 380                                 argc -= g_cmdoptions[i].param_count;
 381                                 argv += g_cmdoptions[i].param_count;
 382                                 break;
 383                         }
 384                 }
 385                 if (!g_cmdoptions[i].name) {
 386                         if (argc == 1) {
 387                                 mode = *argv;
 388                                 g_options |= OPT_READMODE;
 389                         } else {
 390                                 bb_show_usage();
 391                         }
 392                 }
 393         }
 394
 395         fh = xopen(fbdev, O_RDONLY);
 396         if (ioctl(fh, FBIOGET_VSCREENINFO, &var))
 397                 bb_perror_msg_and_die("fbset(ioctl)");
 398         if (g_options & OPT_READMODE) {
 399                 if (!readmode(&var, modefile, mode)) {
 400                         bb_error_msg("unknown video mode '%s'", mode);
 401                         return EXIT_FAILURE;
 402                 }
 403         }
 404
 405         setmode(&var, &varset);
 406         if (g_options & OPT_CHANGE) {
 407                 if (g_options & OPT_ALL)
 408                         var.activate = FB_ACTIVATE_ALL;
 409                 if (ioctl(fh, FBIOPUT_VSCREENINFO, &var))
 410                         bb_perror_msg_and_die("fbset(ioctl)");
 411         }
 412         showmode(&var);
 413         /* Don't close the file, as exiting will take care of that */
 414         /* close(fh); */
 415
 416         return EXIT_SUCCESS;
 417 }