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