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 "busybox.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
  25         CMD_FB = 1,
  26         CMD_DB = 2,
  27         CMD_GEOMETRY = 3,
  28         CMD_TIMING = 4,
  29         CMD_ACCEL = 5,
  30         CMD_HSYNC = 6,
  31         CMD_VSYNC = 7,
  32         CMD_LACED = 8,
  33         CMD_DOUBLE = 9,
  34 /*      CMD_XCOMPAT =     10, */
  35         CMD_ALL = 11,
  36         CMD_INFO = 12,
  37         CMD_CHANGE = 13,
  38
  39 #ifdef CONFIG_FEATURE_FBSET_FANCY
  40         CMD_XRES = 100,
  41         CMD_YRES = 101,
  42         CMD_VXRES = 102,
  43         CMD_VYRES = 103,
  44         CMD_DEPTH = 104,
  45         CMD_MATCH = 105,
  46         CMD_PIXCLOCK = 106,
  47         CMD_LEFT = 107,
  48         CMD_RIGHT = 108,
  49         CMD_UPPER = 109,
  50         CMD_LOWER = 110,
  51         CMD_HSLEN = 111,
  52         CMD_VSLEN = 112,
  53         CMD_CSYNC = 113,
  54         CMD_GSYNC = 114,
  55         CMD_EXTSYNC = 115,
  56         CMD_BCAST = 116,
  57         CMD_RGBA = 117,
  58         CMD_STEP = 118,
  59         CMD_MOVE = 119,
  60 #endif
  61 };
  62
  63 static unsigned int g_options = 0;
  64
  65 /* Stuff stolen from the kernel's fb.h */
  66 enum {
  67         FBIOGET_VSCREENINFO = 0x4600,
  68         FBIOPUT_VSCREENINFO = 0x4601
  69 };
  70 struct fb_bitfield {
  71         uint32_t offset;                        /* beginning of bitfield        */
  72         uint32_t length;                        /* length of bitfield           */
  73         uint32_t msb_right;             /* != 0 : Most significant bit is */
  74                                         /* right */
  75 };
  76 struct fb_var_screeninfo {
  77         uint32_t xres;                  /* visible resolution           */
  78         uint32_t yres;
  79         uint32_t xres_virtual;          /* virtual resolution           */
  80         uint32_t yres_virtual;
  81         uint32_t xoffset;                       /* offset from virtual to visible */
  82         uint32_t yoffset;                       /* resolution                   */
  83
  84         uint32_t bits_per_pixel;                /* guess what                   */
  85         uint32_t grayscale;             /* != 0 Graylevels instead of colors */
  86
  87         struct fb_bitfield red;         /* bitfield in fb mem if true color, */
  88         struct fb_bitfield green;       /* else only length is significant */
  89         struct fb_bitfield blue;
  90         struct fb_bitfield transp;      /* transparency                 */
  91
  92         uint32_t nonstd;                        /* != 0 Non standard pixel format */
  93
  94         uint32_t activate;                      /* see FB_ACTIVATE_*            */
  95
  96         uint32_t height;                        /* height of picture in mm    */
  97         uint32_t width;                 /* width of picture in mm     */
  98
  99         uint32_t accel_flags;           /* acceleration flags (hints)   */
 100
 101         /* Timing: All values in pixclocks, except pixclock (of course) */
 102         uint32_t pixclock;                      /* pixel clock in ps (pico seconds) */
 103         uint32_t left_margin;           /* time from sync to picture    */
 104         uint32_t right_margin;          /* time from picture to sync    */
 105         uint32_t upper_margin;          /* time from sync to picture    */
 106         uint32_t lower_margin;
 107         uint32_t hsync_len;             /* length of horizontal sync    */
 108         uint32_t vsync_len;             /* length of vertical sync      */
 109         uint32_t sync;                  /* see FB_SYNC_*                */
 110         uint32_t vmode;                 /* see FB_VMODE_*               */
 111         uint32_t reserved[6];           /* Reserved for future compatibility */
 112 };
 113
 114
 115 static const struct cmdoptions_t {
 116         const char *name;
 117         const unsigned char param_count;
 118         const unsigned char code;
 119 } g_cmdoptions[] = {
 120         {
 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 #ifdef CONFIG_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, 0}
 159 };
 160
 161 #ifdef CONFIG_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 static int readmode(struct fb_var_screeninfo *base, const char *fn,
 173                                         const char *mode)
 174 {
 175 #ifdef CONFIG_FEATURE_FBSET_READMODE
 176         FILE *f;
 177         char buf[256];
 178         char *p = buf;
 179
 180         f = xfopen(fn, "r");
 181         while (!feof(f)) {
 182                 fgets(buf, sizeof(buf), f);
 183                 if ((p = strstr(buf, "mode ")) || (p = strstr(buf, "mode\t"))) {
 184                         p += 5;
 185                         if ((p = strstr(buf, mode))) {
 186                                 p += strlen(mode);
 187                                 if (!isspace(*p) && (*p != 0) && (*p != '"')
 188                                         && (*p != '\r') && (*p != '\n'))
 189                                         continue;       /* almost, but not quite */
 190                                 while (!feof(f)) {
 191                                         fgets(buf, sizeof(buf), f);
 192
 193                     if ((p = strstr(buf, "geometry "))) {
 194                         p += 9;
 195
 196                         sscanf(p, "%d %d %d %d %d",
 197                                 &(base->xres), &(base->yres),
 198                                 &(base->xres_virtual), &(base->yres_virtual),
 199                                 &(base->bits_per_pixel));
 200                     } else if ((p = strstr(buf, "timings "))) {
 201                         p += 8;
 202
 203                         sscanf(p, "%d %d %d %d %d %d %d",
 204                                 &(base->pixclock),
 205                                 &(base->left_margin), &(base->right_margin),
 206                                 &(base->upper_margin), &(base->lower_margin),
 207                                 &(base->hsync_len), &(base->vsync_len));
 208                     } else if ((p = strstr(buf, "laced "))) {
 209                         p += 6;
 210
 211                         if (strstr(buf, "false")) {
 212                             base->vmode &= ~FB_VMODE_INTERLACED;
 213                         } else {
 214                             base->vmode |= FB_VMODE_INTERLACED;
 215                         }
 216                     } else if ((p = strstr(buf, "double "))) {
 217                         p += 7;
 218
 219                         if (strstr(buf, "false")) {
 220                             base->vmode &= ~FB_VMODE_DOUBLE;
 221                         } else {
 222                             base->vmode |= FB_VMODE_DOUBLE;
 223                         }
 224                     } else if ((p = strstr(buf, "vsync "))) {
 225                         p += 6;
 226
 227                         if (strstr(buf, "low")) {
 228                             base->sync &= ~FB_SYNC_VERT_HIGH_ACT;
 229                         } else {
 230                             base->sync |= FB_SYNC_VERT_HIGH_ACT;
 231                         }
 232                     } else if ((p = strstr(buf, "hsync "))) {
 233                         p += 6;
 234
 235                         if (strstr(buf, "low")) {
 236                             base->sync &= ~FB_SYNC_HOR_HIGH_ACT;
 237                         } else {
 238                             base->sync |= FB_SYNC_HOR_HIGH_ACT;
 239                         }
 240                     } else if ((p = strstr(buf, "csync "))) {
 241                         p += 6;
 242
 243                         if (strstr(buf, "low")) {
 244                             base->sync &= ~FB_SYNC_COMP_HIGH_ACT;
 245                         } else {
 246                             base->sync |= FB_SYNC_COMP_HIGH_ACT;
 247                         }
 248                     } else if ((p = strstr(buf, "extsync "))) {
 249                         p += 8;
 250
 251                         if (strstr(buf, "false")) {
 252                             base->sync &= ~FB_SYNC_EXT;
 253                         } else {
 254                             base->sync |= FB_SYNC_EXT;
 255                         }
 256                     }
 257
 258                                         if (strstr(buf, "endmode"))
 259                                                 return 1;
 260                                 }
 261                         }
 262                 }
 263         }
 264 #else
 265         bb_error_msg( "mode reading not compiled in");
 266 #endif
 267         return 0;
 268 }
 269
 270 static inline void setmode(struct fb_var_screeninfo *base,
 271                                         struct fb_var_screeninfo *set)
 272 {
 273         if ((int) set->xres > 0)
 274                 base->xres = set->xres;
 275         if ((int) set->yres > 0)
 276                 base->yres = set->yres;
 277         if ((int) set->xres_virtual > 0)
 278                 base->xres_virtual = set->xres_virtual;
 279         if ((int) set->yres_virtual > 0)
 280                 base->yres_virtual = set->yres_virtual;
 281         if ((int) set->bits_per_pixel > 0)
 282                 base->bits_per_pixel = set->bits_per_pixel;
 283 }
 284
 285 static inline void showmode(struct fb_var_screeninfo *v)
 286 {
 287         double drate = 0, hrate = 0, vrate = 0;
 288
 289         if (v->pixclock) {
 290                 drate = 1e12 / v->pixclock;
 291                 hrate =
 292                         drate / (v->left_margin + v->xres + v->right_margin +
 293                                          v->hsync_len);
 294                 vrate =
 295                         hrate / (v->upper_margin + v->yres + v->lower_margin +
 296                                          v->vsync_len);
 297         }
 298         printf("\nmode \"%ux%u-%u\"\n"
 299 #ifdef CONFIG_FEATURE_FBSET_FANCY
 300         "\t# D: %.3f MHz, H: %.3f kHz, V: %.3f Hz\n"
 301 #endif
 302         "\tgeometry %u %u %u %u %u\n\ttimings %u %u %u %u %u %u %u\n\taccel %s\n\trgba %u/%u,%u/%u,%u/%u,%u/%u\nendmode\n\n",
 303                    v->xres, v->yres, (int) (vrate + 0.5),
 304 #ifdef CONFIG_FEATURE_FBSET_FANCY
 305                    drate / 1e6, hrate / 1e3, vrate,
 306 #endif
 307                    v->xres, v->yres, v->xres_virtual, v->yres_virtual,
 308                    v->bits_per_pixel, v->pixclock, v->left_margin,
 309                    v->right_margin, v->upper_margin, v->lower_margin, v->hsync_len,
 310                    v->vsync_len, (v->accel_flags > 0 ? "true" : "false"), v->red.length,
 311                    v->red.offset, v->green.length, v->green.offset, v->blue.length,
 312                    v->blue.offset, v->transp.length, v->transp.offset);
 313 }
 314
 315 #ifdef STANDALONE
 316 int main(int argc, char **argv)
 317 #else
 318 int fbset_main(int argc, char **argv)
 319 #endif
 320 {
 321         struct fb_var_screeninfo var, varset;
 322         int fh, i;
 323         char *fbdev = DEFAULTFBDEV;
 324         char *modefile = DEFAULTFBMODE;
 325         char *thisarg, *mode = NULL;
 326
 327         memset(&varset, 0xFF, sizeof(varset));
 328
 329         /* parse cmd args.... why do they have to make things so difficult? */
 330         argv++;
 331         argc--;
 332         for (; argc > 0 && (thisarg = *argv); argc--, argv++) {
 333                 for (i = 0; g_cmdoptions[i].name; i++) {
 334                         if (!strcmp(thisarg, g_cmdoptions[i].name)) {
 335                                 if (argc - 1 < g_cmdoptions[i].param_count)
 336                                         bb_show_usage();
 337                                 switch (g_cmdoptions[i].code) {
 338                                 case CMD_FB:
 339                                         fbdev = argv[1];
 340                                         break;
 341                                 case CMD_DB:
 342                                         modefile = argv[1];
 343                                         break;
 344                                 case CMD_GEOMETRY:
 345                                         varset.xres = strtoul(argv[1], 0, 0);
 346                                         varset.yres = strtoul(argv[2], 0, 0);
 347                                         varset.xres_virtual = strtoul(argv[3], 0, 0);
 348                                         varset.yres_virtual = strtoul(argv[4], 0, 0);
 349                                         varset.bits_per_pixel = strtoul(argv[5], 0, 0);
 350                                         break;
 351                                 case CMD_TIMING:
 352                                         varset.pixclock = strtoul(argv[1], 0, 0);
 353                                         varset.left_margin = strtoul(argv[2], 0, 0);
 354                                         varset.right_margin = strtoul(argv[3], 0, 0);
 355                                         varset.upper_margin = strtoul(argv[4], 0, 0);
 356                                         varset.lower_margin = strtoul(argv[5], 0, 0);
 357                                         varset.hsync_len = strtoul(argv[6], 0, 0);
 358                                         varset.vsync_len = strtoul(argv[7], 0, 0);
 359                                         break;
 360                 case CMD_CHANGE:
 361                     g_options |= OPT_CHANGE;
 362                     break;
 363 #ifdef CONFIG_FEATURE_FBSET_FANCY
 364                                 case CMD_XRES:
 365                                         varset.xres = strtoul(argv[1], 0, 0);
 366                                         break;
 367                                 case CMD_YRES:
 368                                         varset.yres = strtoul(argv[1], 0, 0);
 369                                         break;
 370                            case CMD_DEPTH:
 371                                         varset.bits_per_pixel = strtoul(argv[1], 0, 0);
 372                                         break;
 373 #endif
 374                                 }
 375                                 argc -= g_cmdoptions[i].param_count;
 376                                 argv += g_cmdoptions[i].param_count;
 377                                 break;
 378                         }
 379                 }
 380                 if (!g_cmdoptions[i].name) {
 381                         if (argc == 1) {
 382                                 mode = *argv;
 383                                 g_options |= OPT_READMODE;
 384                         } else {
 385                                 bb_show_usage();
 386                         }
 387                 }
 388         }
 389
 390         fh = xopen(fbdev, O_RDONLY);
 391         if (ioctl(fh, FBIOGET_VSCREENINFO, &var))
 392                 bb_perror_msg_and_die("fbset(ioctl)");
 393         if (g_options & OPT_READMODE) {
 394                 if (!readmode(&var, modefile, mode)) {
 395                         bb_error_msg("Unknown video mode `%s'", mode);
 396                         return EXIT_FAILURE;
 397                 }
 398         }
 399
 400         setmode(&var, &varset);
 401         if (g_options & OPT_CHANGE)
 402                 if (ioctl(fh, FBIOPUT_VSCREENINFO, &var))
 403                         bb_perror_msg_and_die("fbset(ioctl)");
 404         showmode(&var);
 405         /* Don't close the file, as exiting will take care of that */
 406         /* close(fh); */
 407
 408         return EXIT_SUCCESS;
 409 }