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