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 source tree.
   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 //usage:#define fbset_trivial_usage
  16 //usage:       "[OPTIONS] [MODE]"
  17 //usage:#define fbset_full_usage "\n\n"
  18 //usage:       "Show and modify frame buffer settings"
  19 //usage:
  20 //usage:#define fbset_example_usage
  21 //usage:       "$ fbset\n"
  22 //usage:       "mode \"1024x768-76\"\n"
  23 //usage:       "        # D: 78.653 MHz, H: 59.949 kHz, V: 75.694 Hz\n"
  24 //usage:       "        geometry 1024 768 1024 768 16\n"
  25 //usage:       "        timings 12714 128 32 16 4 128 4\n"
  26 //usage:       "        accel false\n"
  27 //usage:       "        rgba 5/11,6/5,5/0,0/0\n"
  28 //usage:       "endmode\n"
  29
  30 #include "libbb.h"
  31
  32 #define DEFAULTFBDEV  FB_0
  33 #define DEFAULTFBMODE "/etc/fb.modes"
  34
  35 /* Stuff stolen from the kernel's fb.h */
  36 #define FB_ACTIVATE_ALL 64
  37 enum {
  38         FBIOGET_VSCREENINFO = 0x4600,
  39         FBIOPUT_VSCREENINFO = 0x4601
  40 };
  41
  42 struct fb_bitfield {
  43         uint32_t offset;                /* beginning of bitfield */
  44         uint32_t length;                /* length of bitfield */
  45         uint32_t msb_right;             /* !=0: Most significant bit is right */
  46 };
  47 struct fb_var_screeninfo {
  48         uint32_t xres;                  /* visible resolution */
  49         uint32_t yres;
  50         uint32_t xres_virtual;          /* virtual resolution */
  51         uint32_t yres_virtual;
  52         uint32_t xoffset;               /* offset from virtual to visible */
  53         uint32_t yoffset;               /* resolution */
  54
  55         uint32_t bits_per_pixel;
  56         uint32_t grayscale;             /* !=0 Graylevels instead of colors */
  57
  58         struct fb_bitfield red;         /* bitfield in fb mem if true color, */
  59         struct fb_bitfield green;       /* else only length is significant */
  60         struct fb_bitfield blue;
  61         struct fb_bitfield transp;      /* transparency */
  62
  63         uint32_t nonstd;                /* !=0 Non standard pixel format */
  64
  65         uint32_t activate;              /* see FB_ACTIVATE_x */
  66
  67         uint32_t height;                /* height of picture in mm */
  68         uint32_t width;                 /* width of picture in mm */
  69
  70         uint32_t accel_flags;           /* acceleration flags (hints) */
  71
  72         /* Timing: All values in pixclocks, except pixclock (of course) */
  73         uint32_t pixclock;              /* pixel clock in ps (pico seconds) */
  74         uint32_t left_margin;           /* time from sync to picture */
  75         uint32_t right_margin;          /* time from picture to sync */
  76         uint32_t upper_margin;          /* time from sync to picture */
  77         uint32_t lower_margin;
  78         uint32_t hsync_len;             /* length of horizontal sync */
  79         uint32_t vsync_len;             /* length of vertical sync */
  80         uint32_t sync;                  /* see FB_SYNC_x */
  81         uint32_t vmode;                 /* see FB_VMODE_x */
  82         uint32_t reserved[6];           /* Reserved for future compatibility */
  83 };
  84
  85 static void copy_if_gt0(uint32_t *src, uint32_t *dst, unsigned cnt)
  86 {
  87         do {
  88                 if ((int32_t) *src > 0)
  89                         *dst = *src;
  90                 src++;
  91                 dst++;
  92         } while (--cnt);
  93 }
  94
  95 static NOINLINE void copy_changed_values(
  96                 struct fb_var_screeninfo *base,
  97                 struct fb_var_screeninfo *set)
  98 {
  99         //if ((int32_t) set->xres > 0) base->xres = set->xres;
 100         //if ((int32_t) set->yres > 0) base->yres = set->yres;
 101         //if ((int32_t) set->xres_virtual > 0)   base->xres_virtual = set->xres_virtual;
 102         //if ((int32_t) set->yres_virtual > 0)   base->yres_virtual = set->yres_virtual;
 103         copy_if_gt0(&set->xres, &base->xres, 4);
 104
 105         if ((int32_t) set->bits_per_pixel > 0) base->bits_per_pixel = set->bits_per_pixel;
 106         //copy_if_gt0(&set->bits_per_pixel, &base->bits_per_pixel, 1);
 107
 108         //if ((int32_t) set->pixclock > 0)       base->pixclock = set->pixclock;
 109         //if ((int32_t) set->left_margin > 0)    base->left_margin = set->left_margin;
 110         //if ((int32_t) set->right_margin > 0)   base->right_margin = set->right_margin;
 111         //if ((int32_t) set->upper_margin > 0)   base->upper_margin = set->upper_margin;
 112         //if ((int32_t) set->lower_margin > 0)   base->lower_margin = set->lower_margin;
 113         //if ((int32_t) set->hsync_len > 0) base->hsync_len = set->hsync_len;
 114         //if ((int32_t) set->vsync_len > 0) base->vsync_len = set->vsync_len;
 115         //if ((int32_t) set->sync > 0)  base->sync = set->sync;
 116         //if ((int32_t) set->vmode > 0) base->vmode = set->vmode;
 117         copy_if_gt0(&set->pixclock, &base->pixclock, 9);
 118 }
 119
 120
 121 enum {
 122         CMD_FB = 1,
 123         CMD_DB = 2,
 124         CMD_GEOMETRY = 3,
 125         CMD_TIMING = 4,
 126         CMD_ACCEL = 5,
 127         CMD_HSYNC = 6,
 128         CMD_VSYNC = 7,
 129         CMD_LACED = 8,
 130         CMD_DOUBLE = 9,
 131 /*      CMD_XCOMPAT =     10, */
 132         CMD_ALL = 11,
 133         CMD_INFO = 12,
 134         CMD_SHOW = 13,
 135         CMD_CHANGE = 14,
 136
 137 #if ENABLE_FEATURE_FBSET_FANCY
 138         CMD_XRES = 100,
 139         CMD_YRES = 101,
 140         CMD_VXRES = 102,
 141         CMD_VYRES = 103,
 142         CMD_DEPTH = 104,
 143         CMD_MATCH = 105,
 144         CMD_PIXCLOCK = 106,
 145         CMD_LEFT = 107,
 146         CMD_RIGHT = 108,
 147         CMD_UPPER = 109,
 148         CMD_LOWER = 110,
 149         CMD_HSLEN = 111,
 150         CMD_VSLEN = 112,
 151         CMD_CSYNC = 113,
 152         CMD_GSYNC = 114,
 153         CMD_EXTSYNC = 115,
 154         CMD_BCAST = 116,
 155         CMD_RGBA = 117,
 156         CMD_STEP = 118,
 157         CMD_MOVE = 119,
 158 #endif
 159 };
 160
 161 static const struct cmdoptions_t {
 162         const char name[9];
 163         const unsigned char param_count;
 164         const unsigned char code;
 165 } g_cmdoptions[] = {
 166         /*"12345678" + NUL */
 167         { "fb"      , 1, CMD_FB       },
 168         { "db"      , 1, CMD_DB       },
 169         { "a"       , 0, CMD_ALL      },
 170         { "i"       , 0, CMD_INFO     },
 171         { "g"       , 5, CMD_GEOMETRY },
 172         { "t"       , 7, CMD_TIMING   },
 173         { "accel"   , 1, CMD_ACCEL    },
 174         { "hsync"   , 1, CMD_HSYNC    },
 175         { "vsync"   , 1, CMD_VSYNC    },
 176         { "laced"   , 1, CMD_LACED    },
 177         { "double"  , 1, CMD_DOUBLE   },
 178         { "show"    , 0, CMD_SHOW     },
 179         { "s"       , 0, CMD_SHOW     },
 180 #if ENABLE_FEATURE_FBSET_FANCY
 181         { "all"     , 0, CMD_ALL      },
 182         { "xres"    , 1, CMD_XRES     },
 183         { "yres"    , 1, CMD_YRES     },
 184         { "vxres"   , 1, CMD_VXRES    },
 185         { "vyres"   , 1, CMD_VYRES    },
 186         { "depth"   , 1, CMD_DEPTH    },
 187         { "match"   , 0, CMD_MATCH    },
 188         { "geometry", 5, CMD_GEOMETRY },
 189         { "pixclock", 1, CMD_PIXCLOCK },
 190         { "left"    , 1, CMD_LEFT     },
 191         { "right"   , 1, CMD_RIGHT    },
 192         { "upper"   , 1, CMD_UPPER    },
 193         { "lower"   , 1, CMD_LOWER    },
 194         { "hslen"   , 1, CMD_HSLEN    },
 195         { "vslen"   , 1, CMD_VSLEN    },
 196         { "timings" , 7, CMD_TIMING   },
 197         { "csync"   , 1, CMD_CSYNC    },
 198         { "gsync"   , 1, CMD_GSYNC    },
 199         { "extsync" , 1, CMD_EXTSYNC  },
 200         { "bcast"   , 1, CMD_BCAST    },
 201         { "rgba"    , 1, CMD_RGBA     },
 202         { "step"    , 1, CMD_STEP     },
 203         { "move"    , 1, CMD_MOVE     },
 204 #endif
 205 };
 206
 207 /* taken from linux/fb.h */
 208 enum {
 209         FB_SYNC_HOR_HIGH_ACT = 1,       /* horizontal sync high active */
 210         FB_SYNC_VERT_HIGH_ACT = 2,      /* vertical sync high active */
 211 #if ENABLE_FEATURE_FBSET_READMODE
 212         FB_VMODE_INTERLACED = 1,        /* interlaced */
 213         FB_VMODE_DOUBLE = 2,            /* double scan */
 214         FB_SYNC_EXT = 4,                /* external sync */
 215         FB_SYNC_COMP_HIGH_ACT = 8,      /* composite sync high active */
 216 #endif
 217 };
 218
 219 #if ENABLE_FEATURE_FBSET_READMODE
 220 static void ss(uint32_t *x, uint32_t flag, char *buf, const char *what)
 221 {
 222         if (strcmp(buf, what) == 0)
 223                 *x &= ~flag;
 224         else
 225                 *x |= flag;
 226 }
 227
 228 /* Mode db file contains mode definitions like this:
 229  * mode "800x600-48-lace"
 230  *     # D: 36.00 MHz, H: 33.835 kHz, V: 96.39 Hz
 231  *     geometry 800 600 800 600 8
 232  *     timings 27778 56 80 79 11 128 12
 233  *     laced true
 234  *     hsync high
 235  *     vsync high
 236  * endmode
 237  */
 238 static int read_mode_db(struct fb_var_screeninfo *base, const char *fn,
 239                                         const char *mode)
 240 {
 241         char *token[2], *p, *s;
 242         parser_t *parser = config_open(fn);
 243
 244         while (config_read(parser, token, 2, 1, "# \t\r", PARSE_NORMAL)) {
 245                 if (strcmp(token[0], "mode") != 0 || !token[1])
 246                         continue;
 247                 p = strstr(token[1], mode);
 248                 if (!p)
 249                         continue;
 250                 s = p + strlen(mode);
 251                 //bb_info_msg("CHECK[%s][%s][%d]", mode, p-1, *s);
 252                 /* exact match? */
 253                 if (((!*s || isspace(*s)) && '"' != s[-1]) /* end-of-token */
 254                  || ('"' == *s && '"' == p[-1]) /* ends with " but starts with " too! */
 255                 ) {
 256                         //bb_info_msg("FOUND[%s][%s][%s][%d]", token[1], p, mode, isspace(*s));
 257                         break;
 258                 }
 259         }
 260
 261         if (!token[0])
 262                 return 0;
 263
 264         while (config_read(parser, token, 2, 1, "# \t", PARSE_NORMAL)) {
 265                 int i;
 266
 267 //bb_info_msg("???[%s][%s]", token[0], token[1]);
 268                 if (strcmp(token[0], "endmode") == 0) {
 269 //bb_info_msg("OK[%s]", mode);
 270                         return 1;
 271                 }
 272                 p = token[1];
 273                 i = index_in_strings(
 274                         "geometry\0timings\0interlaced\0double\0vsync\0hsync\0csync\0extsync\0rgba\0",
 275                         token[0]);
 276                 switch (i) {
 277                 case 0:
 278                         if (sizeof(int) == sizeof(base->xres)) {
 279                                 sscanf(p, "%d %d %d %d %d",
 280                                         &base->xres, &base->yres,
 281                                         &base->xres_virtual, &base->yres_virtual,
 282                                         &base->bits_per_pixel);
 283                         } else {
 284                                 int base_xres, base_yres;
 285                                 int base_xres_virtual, base_yres_virtual;
 286                                 int base_bits_per_pixel;
 287                                 sscanf(p, "%d %d %d %d %d",
 288                                         &base_xres, &base_yres,
 289                                         &base_xres_virtual, &base_yres_virtual,
 290                                         &base_bits_per_pixel);
 291                                 base->xres = base_xres;
 292                                 base->yres = base_yres;
 293                                 base->xres_virtual = base_xres_virtual;
 294                                 base->yres_virtual = base_yres_virtual;
 295                                 base->bits_per_pixel = base_bits_per_pixel;
 296                         }
 297 //bb_info_msg("GEO[%s]", p);
 298                         break;
 299                 case 1:
 300                         if (sizeof(int) == sizeof(base->xres)) {
 301                                 sscanf(p, "%d %d %d %d %d %d %d",
 302                                         &base->pixclock,
 303                                         &base->left_margin, &base->right_margin,
 304                                         &base->upper_margin, &base->lower_margin,
 305                                         &base->hsync_len, &base->vsync_len);
 306                         } else {
 307                                 int base_pixclock;
 308                                 int base_left_margin, base_right_margin;
 309                                 int base_upper_margin, base_lower_margin;
 310                                 int base_hsync_len, base_vsync_len;
 311                                 sscanf(p, "%d %d %d %d %d %d %d",
 312                                         &base_pixclock,
 313                                         &base_left_margin, &base_right_margin,
 314                                         &base_upper_margin, &base_lower_margin,
 315                                         &base_hsync_len, &base_vsync_len);
 316                                 base->pixclock = base_pixclock;
 317                                 base->left_margin = base_left_margin;
 318                                 base->right_margin = base_right_margin;
 319                                 base->upper_margin = base_upper_margin;
 320                                 base->lower_margin = base_lower_margin;
 321                                 base->hsync_len = base_hsync_len;
 322                                 base->vsync_len = base_vsync_len;
 323                         }
 324 //bb_info_msg("TIM[%s]", p);
 325                         break;
 326                 case 2:
 327                 case 3: {
 328                         static const uint32_t syncs[] = {FB_VMODE_INTERLACED, FB_VMODE_DOUBLE};
 329                         ss(&base->vmode, syncs[i-2], p, "false");
 330 //bb_info_msg("VMODE[%s]", p);
 331                         break;
 332                 }
 333                 case 4:
 334                 case 5:
 335                 case 6: {
 336                         static const uint32_t syncs[] = {FB_SYNC_VERT_HIGH_ACT, FB_SYNC_HOR_HIGH_ACT, FB_SYNC_COMP_HIGH_ACT};
 337                         ss(&base->sync, syncs[i-4], p, "low");
 338 //bb_info_msg("SYNC[%s]", p);
 339                         break;
 340                 }
 341                 case 7:
 342                         ss(&base->sync, FB_SYNC_EXT, p, "false");
 343 //bb_info_msg("EXTSYNC[%s]", p);
 344                         break;
 345                 case 8: {
 346                         int red_offset, red_length;
 347                         int green_offset, green_length;
 348                         int blue_offset, blue_length;
 349                         int transp_offset, transp_length;
 350
 351                         sscanf(p, "%d/%d,%d/%d,%d/%d,%d/%d",
 352                                 &red_offset, &red_length,
 353                                 &green_offset, &green_length,
 354                                 &blue_offset, &blue_length,
 355                                 &transp_offset, &transp_length);
 356                         base->red.offset = red_offset;
 357                         base->red.length = red_length;
 358                         base->red.msb_right = 0;
 359                         base->green.offset = green_offset;
 360                         base->green.length = green_length;
 361                         base->green.msb_right = 0;
 362                         base->blue.offset = blue_offset;
 363                         base->blue.length = blue_length;
 364                         base->blue.msb_right = 0;
 365                         base->transp.offset = transp_offset;
 366                         base->transp.length = transp_length;
 367                         base->transp.msb_right = 0;
 368                 }
 369                 }
 370         }
 371         return 0;
 372 }
 373 #endif
 374
 375 static NOINLINE void showmode(struct fb_var_screeninfo *v)
 376 {
 377         double drate = 0, hrate = 0, vrate = 0;
 378
 379         if (v->pixclock) {
 380                 drate = 1e12 / v->pixclock;
 381                 hrate = drate / (v->left_margin + v->xres + v->right_margin + v->hsync_len);
 382                 vrate = hrate / (v->upper_margin + v->yres + v->lower_margin + v->vsync_len);
 383         }
 384         printf("\nmode \"%ux%u-%u\"\n"
 385 #if ENABLE_FEATURE_FBSET_FANCY
 386         "\t# D: %.3f MHz, H: %.3f kHz, V: %.3f Hz\n"
 387 #endif
 388         "\tgeometry %u %u %u %u %u\n"
 389         "\ttimings %u %u %u %u %u %u %u\n"
 390         "\taccel %s\n"
 391         "\trgba %u/%u,%u/%u,%u/%u,%u/%u\n"
 392         "endmode\n\n",
 393                 v->xres, v->yres, (int) (vrate + 0.5),
 394 #if ENABLE_FEATURE_FBSET_FANCY
 395                 drate / 1e6, hrate / 1e3, vrate,
 396 #endif
 397                 v->xres, v->yres, v->xres_virtual, v->yres_virtual, v->bits_per_pixel,
 398                 v->pixclock, v->left_margin, v->right_margin, v->upper_margin, v->lower_margin,
 399                         v->hsync_len, v->vsync_len,
 400                 (v->accel_flags > 0 ? "true" : "false"),
 401                 v->red.length, v->red.offset, v->green.length, v->green.offset,
 402                         v->blue.length, v->blue.offset, v->transp.length, v->transp.offset);
 403 }
 404
 405 int fbset_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 406 int fbset_main(int argc, char **argv)
 407 {
 408         enum {
 409                 OPT_CHANGE   = (1 << 0),
 410                 OPT_SHOW     = (1 << 1),
 411                 OPT_READMODE = (1 << 2),
 412                 OPT_ALL      = (1 << 3),
 413         };
 414         struct fb_var_screeninfo var_old, var_set;
 415         int fh, i;
 416         unsigned options = 0;
 417
 418         const char *fbdev = DEFAULTFBDEV;
 419         const char *modefile = DEFAULTFBMODE;
 420         char *thisarg;
 421         char *mode = mode; /* for compiler */
 422
 423         memset(&var_set, 0xff, sizeof(var_set)); /* set all to -1 */
 424
 425         /* parse cmd args.... why do they have to make things so difficult? */
 426         argv++;
 427         argc--;
 428         for (; argc > 0 && (thisarg = *argv) != NULL; argc--, argv++) {
 429                 if (thisarg[0] != '-') {
 430                         if (!ENABLE_FEATURE_FBSET_READMODE || argc != 1)
 431                                 bb_show_usage();
 432                         mode = thisarg;
 433                         options |= OPT_READMODE;
 434                         goto contin;
 435                 }
 436                 for (i = 0; i < ARRAY_SIZE(g_cmdoptions); i++) {
 437                         if (strcmp(thisarg + 1, g_cmdoptions[i].name) != 0)
 438                                 continue;
 439                         if (argc <= g_cmdoptions[i].param_count)
 440                                 bb_show_usage();
 441
 442                         switch (g_cmdoptions[i].code) {
 443                         case CMD_FB:
 444                                 fbdev = argv[1];
 445                                 break;
 446                         case CMD_DB:
 447                                 modefile = argv[1];
 448                                 break;
 449                         case CMD_ALL:
 450                                 options |= OPT_ALL;
 451                                 break;
 452                         case CMD_SHOW:
 453                                 options |= OPT_SHOW;
 454                                 break;
 455                         case CMD_GEOMETRY:
 456                                 var_set.xres = xatou32(argv[1]);
 457                                 var_set.yres = xatou32(argv[2]);
 458                                 var_set.xres_virtual = xatou32(argv[3]);
 459                                 var_set.yres_virtual = xatou32(argv[4]);
 460                                 var_set.bits_per_pixel = xatou32(argv[5]);
 461                                 break;
 462                         case CMD_TIMING:
 463                                 var_set.pixclock = xatou32(argv[1]);
 464                                 var_set.left_margin = xatou32(argv[2]);
 465                                 var_set.right_margin = xatou32(argv[3]);
 466                                 var_set.upper_margin = xatou32(argv[4]);
 467                                 var_set.lower_margin = xatou32(argv[5]);
 468                                 var_set.hsync_len = xatou32(argv[6]);
 469                                 var_set.vsync_len = xatou32(argv[7]);
 470                                 break;
 471                         case CMD_ACCEL:
 472                                 break;
 473                         case CMD_HSYNC:
 474                                 var_set.sync |= FB_SYNC_HOR_HIGH_ACT;
 475                                 break;
 476                         case CMD_VSYNC:
 477                                 var_set.sync |= FB_SYNC_VERT_HIGH_ACT;
 478                                 break;
 479 #if ENABLE_FEATURE_FBSET_FANCY
 480                         case CMD_XRES:
 481                                 var_set.xres = xatou32(argv[1]);
 482                                 break;
 483                         case CMD_YRES:
 484                                 var_set.yres = xatou32(argv[1]);
 485                                 break;
 486                         case CMD_DEPTH:
 487                                 var_set.bits_per_pixel = xatou32(argv[1]);
 488                                 break;
 489 #endif
 490                         }
 491                         switch (g_cmdoptions[i].code) {
 492                         case CMD_FB:
 493                         case CMD_DB:
 494                         case CMD_ALL:
 495                         case CMD_SHOW:
 496                                 break;
 497                         default:
 498                                 /* other commands imply changes */
 499                                 options |= OPT_CHANGE;
 500                         }
 501                         argc -= g_cmdoptions[i].param_count;
 502                         argv += g_cmdoptions[i].param_count;
 503                         goto contin;
 504                 }
 505                 bb_show_usage();
 506  contin: ;
 507         }
 508
 509         fh = xopen(fbdev, O_RDONLY);
 510         xioctl(fh, FBIOGET_VSCREENINFO, &var_old);
 511
 512         if (options & OPT_READMODE) {
 513 #if ENABLE_FEATURE_FBSET_READMODE
 514                 if (!read_mode_db(&var_old, modefile, mode)) {
 515                         bb_error_msg_and_die("unknown video mode '%s'", mode);
 516                 }
 517                 options |= OPT_CHANGE;
 518 #endif
 519         }
 520
 521         if (options & OPT_CHANGE) {
 522                 copy_changed_values(&var_old, &var_set);
 523                 if (options & OPT_ALL)
 524                         var_old.activate = FB_ACTIVATE_ALL;
 525                 xioctl(fh, FBIOPUT_VSCREENINFO, &var_old);
 526         }
 527
 528         if (options == 0 || (options & OPT_SHOW))
 529                 showmode(&var_old);
 530
 531         if (ENABLE_FEATURE_CLEAN_UP)
 532                 close(fh);
 533
 534         return EXIT_SUCCESS;
 535 }