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  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  20  *
  21  * This is a from-scratch implementation of fbset; but the de facto fbset
  22  * implementation was a good reference. fbset (original) is released under
  23  * the GPL, and is (c) 1995-1999 by:
  24  *     Geert Uytterhoeven (Geert.Uytterhoeven@cs.kuleuven.ac.be)
  25  */
  26
  27 #include "internal.h"
  28 #include <stdio.h>
  29 #include <stdlib.h>
  30 #include <unistd.h>
  31 #include <fcntl.h>
  32 #include <errno.h>
  33 #include <ctype.h>
  34 #include <sys/ioctl.h>
  35 #include <linux/fb.h>
  36 #include <linux/version.h>
  37
  38 #define PERROR(ctx)   do { perror(ctx); exit(1); } while(0)
  39
  40 #ifndef KERNEL_VERSION
  41 #define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))
  42 #endif
  43
  44 #define DEFAULTFBDEV  "/dev/fb0"
  45 #define DEFAULTFBMODE "/etc/fb.modes"
  46
  47 #define OPT_CHANGE    1
  48 #define OPT_INFO      (1 << 1)
  49 #define OPT_READMODE  (1 << 2)
  50
  51 #define CMD_HELP        0
  52 #define CMD_FB          1
  53 #define CMD_DB          2
  54 #define CMD_GEOMETRY    3
  55 #define CMD_TIMING      4
  56 #define CMD_ACCEL       5
  57 #define CMD_HSYNC       6
  58 #define CMD_VSYNC       7
  59 #define CMD_LACED       8
  60 #define CMD_DOUBLE      9
  61 /* #define CMD_XCOMPAT     10 */
  62 #define CMD_ALL         11
  63 #define CMD_INFO        12
  64 #define CMD_CHANGE      13
  65
  66 #ifdef BB_FEATURE_FBSET_FANCY
  67 #define CMD_XRES        100
  68 #define CMD_YRES        101
  69 #define CMD_VXRES       102
  70 #define CMD_VYRES       103
  71 #define CMD_DEPTH       104
  72 #define CMD_MATCH       105
  73 #define CMD_PIXCLOCK    106
  74 #define CMD_LEFT        107
  75 #define CMD_RIGHT       108
  76 #define CMD_UPPER       109
  77 #define CMD_LOWER       110
  78 #define CMD_HSLEN       111
  79 #define CMD_VSLEN       112
  80 #define CMD_CSYNC       113
  81 #define CMD_GSYNC       114
  82 #define CMD_EXTSYNC     115
  83 #define CMD_BCAST       116
  84 #define CMD_RGBA        117
  85 #define CMD_STEP        118
  86 #define CMD_MOVE        119
  87 #endif
  88
  89 static unsigned int g_options = 0;
  90
  91 struct cmdoptions_t {
  92         char *name;
  93         unsigned char param_count;
  94         unsigned char code;
  95 } g_cmdoptions[] = {
  96         {
  97         "-h", 0, CMD_HELP}, {
  98         "-fb", 1, CMD_FB}, {
  99         "-db", 1, CMD_DB}, {
 100         "-a", 0, CMD_ALL}, {
 101         "-i", 0, CMD_INFO}, {
 102         "-g", 5, CMD_GEOMETRY}, {
 103         "-t", 7, CMD_TIMING}, {
 104         "-accel", 1, CMD_ACCEL}, {
 105         "-hsync", 1, CMD_HSYNC}, {
 106         "-vsync", 1, CMD_VSYNC}, {
 107         "-laced", 1, CMD_LACED}, {
 108         "-double", 1, CMD_DOUBLE}, {
 109         "-help", 0, CMD_HELP}, {
 110         "-n", 0, CMD_CHANGE}, {
 111 #ifdef BB_FEATURE_FBSET_FANCY
 112         "-help", 0, CMD_HELP}, {
 113         "-all", 0, CMD_ALL}, {
 114         "-xres", 1, CMD_XRES}, {
 115         "-yres", 1, CMD_YRES}, {
 116         "-vxres", 1, CMD_VXRES}, {
 117         "-vyres", 1, CMD_VYRES}, {
 118         "-depth", 1, CMD_DEPTH}, {
 119         "-match", 0, CMD_MATCH}, {
 120         "-geometry", 5, CMD_GEOMETRY}, {
 121         "-pixclock", 1, CMD_PIXCLOCK}, {
 122         "-left", 1, CMD_LEFT}, {
 123         "-right", 1, CMD_RIGHT}, {
 124         "-upper", 1, CMD_UPPER}, {
 125         "-lower", 1, CMD_LOWER}, {
 126         "-hslen", 1, CMD_HSLEN}, {
 127         "-vslen", 1, CMD_VSLEN}, {
 128         "-timings", 7, CMD_TIMING}, {
 129         "-csync", 1, CMD_CSYNC}, {
 130         "-gsync", 1, CMD_GSYNC}, {
 131         "-extsync", 1, CMD_EXTSYNC}, {
 132         "-bcast", 1, CMD_BCAST}, {
 133         "-rgba", 1, CMD_RGBA}, {
 134         "-step", 1, CMD_STEP}, {
 135         "-move", 1, CMD_MOVE}, {
 136 #endif
 137         0, 0, 0}
 138 };
 139
 140 static int readmode(struct fb_var_screeninfo *base, const char *fn,
 141                                         const char *mode)
 142 {
 143 #ifdef BB_FEATURE_FBSET_READMODE
 144         FILE *f;
 145         char buf[256];
 146         char *p = buf;
 147
 148         if ((f = fopen(fn, "r")) == NULL)
 149                 PERROR("readmode(fopen)");
 150         while (!feof(f)) {
 151                 fgets(buf, sizeof(buf), f);
 152                 if ((p = strstr(buf, "mode ")) || (p = strstr(buf, "mode\t"))) {
 153                         p += 5;
 154                         if ((p = strstr(buf, mode))) {
 155                                 p += strlen(mode);
 156                                 if (!isspace(*p) && (*p != 0) && (*p != '"')
 157                                         && (*p != '\r') && (*p != '\n'))
 158                                         continue;       /* almost, but not quite */
 159                                 while (!feof(f)) {
 160                                         fgets(buf, sizeof(buf), f);
 161
 162                     if ((p = strstr(buf, "geometry "))) {
 163                         p += 9;
 164
 165                         sscanf(p, "%d %d %d %d %d",
 166                                 &(base->xres), &(base->yres),
 167                                 &(base->xres_virtual), &(base->yres_virtual),
 168                                 &(base->bits_per_pixel));
 169                     } else if ((p = strstr(buf, "timings "))) {
 170                         p += 8;
 171
 172                         sscanf(p, "%d %d %d %d %d %d %d",
 173                                 &(base->pixclock),
 174                                 &(base->left_margin), &(base->right_margin),
 175                                 &(base->upper_margin), &(base->lower_margin),
 176                                 &(base->hsync_len), &(base->vsync_len));
 177                     } else if ((p = strstr(buf, "laced "))) {
 178                         p += 6;
 179
 180                         if (strstr(buf, "false")) {
 181                             base->vmode &= ~FB_VMODE_INTERLACED;
 182                         } else {
 183                             base->vmode |= FB_VMODE_INTERLACED;
 184                         }
 185                     } else if ((p = strstr(buf, "double "))) {
 186                         p += 7;
 187
 188                         if (strstr(buf, "false")) {
 189                             base->vmode &= ~FB_VMODE_DOUBLE;
 190                         } else {
 191                             base->vmode |= FB_VMODE_DOUBLE;
 192                         }
 193                     } else if ((p = strstr(buf, "vsync "))) {
 194                         p += 6;
 195
 196                         if (strstr(buf, "low")) {
 197                             base->sync &= ~FB_SYNC_VERT_HIGH_ACT;
 198                         } else {
 199                             base->sync |= FB_SYNC_VERT_HIGH_ACT;
 200                         }
 201                     } else if ((p = strstr(buf, "hsync "))) {
 202                         p += 6;
 203
 204                         if (strstr(buf, "low")) {
 205                             base->sync &= ~FB_SYNC_HOR_HIGH_ACT;
 206                         } else {
 207                             base->sync |= FB_SYNC_HOR_HIGH_ACT;
 208                         }
 209                     } else if ((p = strstr(buf, "csync "))) {
 210                         p += 6;
 211
 212                         if (strstr(buf, "low")) {
 213                             base->sync &= ~FB_SYNC_COMP_HIGH_ACT;
 214                         } else {
 215                             base->sync |= FB_SYNC_COMP_HIGH_ACT;
 216                         }
 217                     } else if ((p = strstr(buf, "extsync "))) {
 218                         p += 8;
 219
 220                         if (strstr(buf, "false")) {
 221                             base->sync &= ~FB_SYNC_EXT;
 222                         } else {
 223                             base->sync |= FB_SYNC_EXT;
 224                         }
 225                     }
 226
 227                                         if (strstr(buf, "endmode"))
 228                                                 return 1;
 229                                 }
 230                         }
 231                 }
 232         }
 233 #else
 234         errorMsg( "mode reading not compiled in\n");
 235 #endif
 236         return 0;
 237 }
 238
 239 static void setmode(struct fb_var_screeninfo *base,
 240                                         struct fb_var_screeninfo *set)
 241 {
 242         if ((int) set->xres > 0)
 243                 base->xres = set->xres;
 244         if ((int) set->yres > 0)
 245                 base->yres = set->yres;
 246         if ((int) set->xres_virtual > 0)
 247                 base->xres_virtual = set->xres_virtual;
 248         if ((int) set->yres_virtual > 0)
 249                 base->yres_virtual = set->yres_virtual;
 250         if ((int) set->bits_per_pixel > 0)
 251                 base->bits_per_pixel = set->bits_per_pixel;
 252 }
 253
 254 static void showmode(struct fb_var_screeninfo *v)
 255 {
 256         double drate = 0, hrate = 0, vrate = 0;
 257
 258         if (v->pixclock) {
 259                 drate = 1e12 / v->pixclock;
 260                 hrate =
 261                         drate / (v->left_margin + v->xres + v->right_margin +
 262                                          v->hsync_len);
 263                 vrate =
 264                         hrate / (v->upper_margin + v->yres + v->lower_margin +
 265                                          v->vsync_len);
 266         }
 267         printf("\nmode \"%ux%u-%u\"\n", v->xres, v->yres, (int) (vrate + 0.5));
 268 #ifdef BB_FEATURE_FBSET_FANCY
 269         printf("\t# D: %.3f MHz, H: %.3f kHz, V: %.3f Hz\n", drate / 1e6,
 270                    hrate / 1e3, vrate);
 271 #endif
 272         printf("\tgeometry %u %u %u %u %u\n", v->xres, v->yres,
 273                    v->xres_virtual, v->yres_virtual, v->bits_per_pixel);
 274 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,2,0)
 275         printf("\ttimings %u %u %u %u %u %u %u\n", v->pixclock, v->left_margin,
 276                    v->right_margin, v->upper_margin, v->lower_margin, v->hsync_len,
 277                    v->vsync_len);
 278         printf("\taccel %s\n", (v->accel_flags > 0 ? "true" : "false"));
 279 #else
 280         printf("\ttimings %lu %lu %lu %lu %lu %lu %lu\n", v->pixclock,
 281                    v->left_margin, v->right_margin, v->upper_margin,
 282                    v->lower_margin, v->hsync_len, v->vsync_len);
 283 #endif
 284         printf("\trgba %u/%u,%u/%u,%u/%u,%u/%u\n", v->red.length,
 285                    v->red.offset, v->green.length, v->green.offset, v->blue.length,
 286                    v->blue.offset, v->transp.length, v->transp.offset);
 287         printf("endmode\n\n");
 288 }
 289
 290 static void fbset_usage(void)
 291 {
 292 #ifndef BB_FEATURE_TRIVIAL_HELP
 293         int i;
 294 #endif
 295
 296 #ifndef STANDALONE
 297         fprintf(stderr, "BusyBox v%s (%s) multi-call binary -- GPL2\n\n",
 298                         BB_VER, BB_BT);
 299 #endif
 300         fprintf(stderr, "Usage: fbset [options] [mode]\n");
 301 #ifndef BB_FEATURE_TRIVIAL_HELP
 302         fprintf(stderr, "\nShows and modifies frame buffer device settings\n\n");
 303         fprintf(stderr, "The following options are recognized:\n");
 304         for (i = 0; g_cmdoptions[i].name; i++)
 305                 fprintf(stderr, "\t%s\n", g_cmdoptions[i].name);
 306 #endif
 307         exit(-1);
 308 }
 309
 310 #ifdef STANDALONE
 311 int main(int argc, char **argv)
 312 #else
 313 extern int fbset_main(int argc, char **argv)
 314 #endif
 315 {
 316         struct fb_var_screeninfo var, varset;
 317         int fh, i;
 318         char *fbdev = DEFAULTFBDEV;
 319         char *modefile = DEFAULTFBMODE;
 320         char *thisarg, *mode = NULL;
 321
 322         memset(&varset, 0xFF, sizeof(varset));
 323
 324         /* parse cmd args.... why do they have to make things so difficult? */
 325         argv++;
 326         argc--;
 327         for (; argc > 0 && (thisarg = *argv); argc--, argv++) {
 328                 for (i = 0; g_cmdoptions[i].name; i++) {
 329                         if (!strcmp(thisarg, g_cmdoptions[i].name)) {
 330                                 if (argc - 1 < g_cmdoptions[i].param_count)
 331                                         fbset_usage();
 332                                 switch (g_cmdoptions[i].code) {
 333                                 case CMD_HELP:
 334                                         fbset_usage();
 335                                 case CMD_FB:
 336                                         fbdev = argv[1];
 337                                         break;
 338                                 case CMD_DB:
 339                                         modefile = argv[1];
 340                                         break;
 341                                 case CMD_GEOMETRY:
 342                                         varset.xres = strtoul(argv[1], 0, 0);
 343                                         varset.yres = strtoul(argv[2], 0, 0);
 344                                         varset.xres_virtual = strtoul(argv[3], 0, 0);
 345                                         varset.yres_virtual = strtoul(argv[4], 0, 0);
 346                                         varset.bits_per_pixel = strtoul(argv[5], 0, 0);
 347                                         break;
 348                                 case CMD_TIMING:
 349                                         varset.pixclock = strtoul(argv[1], 0, 0);
 350                                         varset.left_margin = strtoul(argv[2], 0, 0);
 351                                         varset.right_margin = strtoul(argv[3], 0, 0);
 352                                         varset.upper_margin = strtoul(argv[4], 0, 0);
 353                                         varset.lower_margin = strtoul(argv[5], 0, 0);
 354                                         varset.hsync_len = strtoul(argv[6], 0, 0);
 355                                         varset.vsync_len = strtoul(argv[7], 0, 0);
 356                                         break;
 357                 case CMD_CHANGE:
 358                     g_options |= OPT_CHANGE;
 359                     break;
 360 #ifdef BB_FEATURE_FBSET_FANCY
 361                                 case CMD_XRES:
 362                                         varset.xres = strtoul(argv[1], 0, 0);
 363                                         break;
 364                                 case CMD_YRES:
 365                                         varset.yres = strtoul(argv[1], 0, 0);
 366                                         break;
 367 #endif
 368                                 }
 369                                 argc -= g_cmdoptions[i].param_count;
 370                                 argv += g_cmdoptions[i].param_count;
 371                                 break;
 372                         }
 373                 }
 374                 if (!g_cmdoptions[i].name) {
 375                         if (argc == 1) {
 376                                 mode = *argv;
 377                                 g_options |= OPT_READMODE;
 378                         } else {
 379                                 fbset_usage();
 380                         }
 381                 }
 382         }
 383
 384         if ((fh = open(fbdev, O_RDONLY)) < 0)
 385                 PERROR("fbset(open)");
 386         if (ioctl(fh, FBIOGET_VSCREENINFO, &var))
 387                 PERROR("fbset(ioctl)");
 388         if (g_options & OPT_READMODE) {
 389                 if (!readmode(&var, modefile, mode)) {
 390                         errorMsg("Unknown video mode `%s'\n", mode);
 391                         exit(1);
 392                 }
 393         }
 394
 395         setmode(&var, &varset);
 396         if (g_options & OPT_CHANGE)
 397                 if (ioctl(fh, FBIOPUT_VSCREENINFO, &var))
 398                         PERROR("fbset(ioctl)");
 399         showmode(&var);
 400         /* Don't close the file, as exiting will take care of that */
 401         /* close(fh); */
 402
 403         return (TRUE);
 404 }