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