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