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 "busybox.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
  36 #define DEFAULTFBDEV  "/dev/fb0"
  37 #define DEFAULTFBMODE "/etc/fb.modes"
  38
  39 #define OPT_CHANGE    1
  40 #define OPT_INFO      (1 << 1)
  41 #define OPT_READMODE  (1 << 2)
  42
  43 #define CMD_HELP        0
  44 #define CMD_FB          1
  45 #define CMD_DB          2
  46 #define CMD_GEOMETRY    3
  47 #define CMD_TIMING      4
  48 #define CMD_ACCEL       5
  49 #define CMD_HSYNC       6
  50 #define CMD_VSYNC       7
  51 #define CMD_LACED       8
  52 #define CMD_DOUBLE      9
  53 /* #define CMD_XCOMPAT     10 */
  54 #define CMD_ALL         11
  55 #define CMD_INFO        12
  56 #define CMD_CHANGE      13
  57
  58 #ifdef BB_FEATURE_FBSET_FANCY
  59 #define CMD_XRES        100
  60 #define CMD_YRES        101
  61 #define CMD_VXRES       102
  62 #define CMD_VYRES       103
  63 #define CMD_DEPTH       104
  64 #define CMD_MATCH       105
  65 #define CMD_PIXCLOCK    106
  66 #define CMD_LEFT        107
  67 #define CMD_RIGHT       108
  68 #define CMD_UPPER       109
  69 #define CMD_LOWER       110
  70 #define CMD_HSLEN       111
  71 #define CMD_VSLEN       112
  72 #define CMD_CSYNC       113
  73 #define CMD_GSYNC       114
  74 #define CMD_EXTSYNC     115
  75 #define CMD_BCAST       116
  76 #define CMD_RGBA        117
  77 #define CMD_STEP        118
  78 #define CMD_MOVE        119
  79 #endif
  80
  81 static unsigned int g_options = 0;
  82
  83 /* Stuff stolen from the kernel's fb.h */
  84 #define FBIOGET_VSCREENINFO     0x4600
  85 #define FBIOPUT_VSCREENINFO     0x4601
  86 #define __u32                   unsigned int
  87 struct fb_bitfield {
  88         __u32 offset;                   /* beginning of bitfield        */
  89         __u32 length;                   /* length of bitfield           */
  90         __u32 msb_right;                /* != 0 : Most significant bit is */
  91                                         /* right */
  92 };
  93 struct fb_var_screeninfo {
  94         __u32 xres;                     /* visible resolution           */
  95         __u32 yres;
  96         __u32 xres_virtual;             /* virtual resolution           */
  97         __u32 yres_virtual;
  98         __u32 xoffset;                  /* offset from virtual to visible */
  99         __u32 yoffset;                  /* resolution                   */
 100
 101         __u32 bits_per_pixel;           /* guess what                   */
 102         __u32 grayscale;                /* != 0 Graylevels instead of colors */
 103
 104         struct fb_bitfield red;         /* bitfield in fb mem if true color, */
 105         struct fb_bitfield green;       /* else only length is significant */
 106         struct fb_bitfield blue;
 107         struct fb_bitfield transp;      /* transparency                 */
 108
 109         __u32 nonstd;                   /* != 0 Non standard pixel format */
 110
 111         __u32 activate;                 /* see FB_ACTIVATE_*            */
 112
 113         __u32 height;                   /* height of picture in mm    */
 114         __u32 width;                    /* width of picture in mm     */
 115
 116         __u32 accel_flags;              /* acceleration flags (hints)   */
 117
 118         /* Timing: All values in pixclocks, except pixclock (of course) */
 119         __u32 pixclock;                 /* pixel clock in ps (pico seconds) */
 120         __u32 left_margin;              /* time from sync to picture    */
 121         __u32 right_margin;             /* time from picture to sync    */
 122         __u32 upper_margin;             /* time from sync to picture    */
 123         __u32 lower_margin;
 124         __u32 hsync_len;                /* length of horizontal sync    */
 125         __u32 vsync_len;                /* length of vertical sync      */
 126         __u32 sync;                     /* see FB_SYNC_*                */
 127         __u32 vmode;                    /* see FB_VMODE_*               */
 128         __u32 reserved[6];              /* Reserved for future compatibility */
 129 };
 130
 131
 132 struct cmdoptions_t {
 133         char *name;
 134         unsigned char param_count;
 135         unsigned char code;
 136 } g_cmdoptions[] = {
 137         {
 138         "-h", 0, CMD_HELP}, {
 139         "-fb", 1, CMD_FB}, {
 140         "-db", 1, CMD_DB}, {
 141         "-a", 0, CMD_ALL}, {
 142         "-i", 0, CMD_INFO}, {
 143         "-g", 5, CMD_GEOMETRY}, {
 144         "-t", 7, CMD_TIMING}, {
 145         "-accel", 1, CMD_ACCEL}, {
 146         "-hsync", 1, CMD_HSYNC}, {
 147         "-vsync", 1, CMD_VSYNC}, {
 148         "-laced", 1, CMD_LACED}, {
 149         "-double", 1, CMD_DOUBLE}, {
 150         "-help", 0, CMD_HELP}, {
 151         "-n", 0, CMD_CHANGE}, {
 152 #ifdef BB_FEATURE_FBSET_FANCY
 153         "-help", 0, CMD_HELP}, {
 154         "-all", 0, CMD_ALL}, {
 155         "-xres", 1, CMD_XRES}, {
 156         "-yres", 1, CMD_YRES}, {
 157         "-vxres", 1, CMD_VXRES}, {
 158         "-vyres", 1, CMD_VYRES}, {
 159         "-depth", 1, CMD_DEPTH}, {
 160         "-match", 0, CMD_MATCH}, {
 161         "-geometry", 5, CMD_GEOMETRY}, {
 162         "-pixclock", 1, CMD_PIXCLOCK}, {
 163         "-left", 1, CMD_LEFT}, {
 164         "-right", 1, CMD_RIGHT}, {
 165         "-upper", 1, CMD_UPPER}, {
 166         "-lower", 1, CMD_LOWER}, {
 167         "-hslen", 1, CMD_HSLEN}, {
 168         "-vslen", 1, CMD_VSLEN}, {
 169         "-timings", 7, CMD_TIMING}, {
 170         "-csync", 1, CMD_CSYNC}, {
 171         "-gsync", 1, CMD_GSYNC}, {
 172         "-extsync", 1, CMD_EXTSYNC}, {
 173         "-bcast", 1, CMD_BCAST}, {
 174         "-rgba", 1, CMD_RGBA}, {
 175         "-step", 1, CMD_STEP}, {
 176         "-move", 1, CMD_MOVE}, {
 177 #endif
 178         0, 0, 0}
 179 };
 180
 181 #ifdef BB_FEATURE_FBSET_READMODE
 182 /* taken from linux/fb.h */
 183 #define FB_VMODE_INTERLACED     1       /* interlaced   */
 184 #define FB_VMODE_DOUBLE         2       /* double scan */
 185 #define FB_SYNC_HOR_HIGH_ACT    1       /* horizontal sync high active  */
 186 #define FB_SYNC_VERT_HIGH_ACT   2       /* vertical sync high active    */
 187 #define FB_SYNC_EXT             4       /* external sync                */
 188 #define FB_SYNC_COMP_HIGH_ACT   8       /* composite sync high active   */
 189 #endif
 190 static int readmode(struct fb_var_screeninfo *base, const char *fn,
 191                                         const char *mode)
 192 {
 193 #ifdef BB_FEATURE_FBSET_READMODE
 194         FILE *f;
 195         char buf[256];
 196         char *p = buf;
 197
 198         if ((f = fopen(fn, "r")) == NULL)
 199                 perror_msg_and_die("readmode(fopen)");
 200         while (!feof(f)) {
 201                 fgets(buf, sizeof(buf), f);
 202                 if ((p = strstr(buf, "mode ")) || (p = strstr(buf, "mode\t"))) {
 203                         p += 5;
 204                         if ((p = strstr(buf, mode))) {
 205                                 p += strlen(mode);
 206                                 if (!isspace(*p) && (*p != 0) && (*p != '"')
 207                                         && (*p != '\r') && (*p != '\n'))
 208                                         continue;       /* almost, but not quite */
 209                                 while (!feof(f)) {
 210                                         fgets(buf, sizeof(buf), f);
 211
 212                     if ((p = strstr(buf, "geometry "))) {
 213                         p += 9;
 214
 215                         sscanf(p, "%d %d %d %d %d",
 216                                 &(base->xres), &(base->yres),
 217                                 &(base->xres_virtual), &(base->yres_virtual),
 218                                 &(base->bits_per_pixel));
 219                     } else if ((p = strstr(buf, "timings "))) {
 220                         p += 8;
 221
 222                         sscanf(p, "%d %d %d %d %d %d %d",
 223                                 &(base->pixclock),
 224                                 &(base->left_margin), &(base->right_margin),
 225                                 &(base->upper_margin), &(base->lower_margin),
 226                                 &(base->hsync_len), &(base->vsync_len));
 227                     } else if ((p = strstr(buf, "laced "))) {
 228                         p += 6;
 229
 230                         if (strstr(buf, "false")) {
 231                             base->vmode &= ~FB_VMODE_INTERLACED;
 232                         } else {
 233                             base->vmode |= FB_VMODE_INTERLACED;
 234                         }
 235                     } else if ((p = strstr(buf, "double "))) {
 236                         p += 7;
 237
 238                         if (strstr(buf, "false")) {
 239                             base->vmode &= ~FB_VMODE_DOUBLE;
 240                         } else {
 241                             base->vmode |= FB_VMODE_DOUBLE;
 242                         }
 243                     } else if ((p = strstr(buf, "vsync "))) {
 244                         p += 6;
 245
 246                         if (strstr(buf, "low")) {
 247                             base->sync &= ~FB_SYNC_VERT_HIGH_ACT;
 248                         } else {
 249                             base->sync |= FB_SYNC_VERT_HIGH_ACT;
 250                         }
 251                     } else if ((p = strstr(buf, "hsync "))) {
 252                         p += 6;
 253
 254                         if (strstr(buf, "low")) {
 255                             base->sync &= ~FB_SYNC_HOR_HIGH_ACT;
 256                         } else {
 257                             base->sync |= FB_SYNC_HOR_HIGH_ACT;
 258                         }
 259                     } else if ((p = strstr(buf, "csync "))) {
 260                         p += 6;
 261
 262                         if (strstr(buf, "low")) {
 263                             base->sync &= ~FB_SYNC_COMP_HIGH_ACT;
 264                         } else {
 265                             base->sync |= FB_SYNC_COMP_HIGH_ACT;
 266                         }
 267                     } else if ((p = strstr(buf, "extsync "))) {
 268                         p += 8;
 269
 270                         if (strstr(buf, "false")) {
 271                             base->sync &= ~FB_SYNC_EXT;
 272                         } else {
 273                             base->sync |= FB_SYNC_EXT;
 274                         }
 275                     }
 276
 277                                         if (strstr(buf, "endmode"))
 278                                                 return 1;
 279                                 }
 280                         }
 281                 }
 282         }
 283 #else
 284         error_msg( "mode reading not compiled in\n");
 285 #endif
 286         return 0;
 287 }
 288
 289 static void setmode(struct fb_var_screeninfo *base,
 290                                         struct fb_var_screeninfo *set)
 291 {
 292         if ((int) set->xres > 0)
 293                 base->xres = set->xres;
 294         if ((int) set->yres > 0)
 295                 base->yres = set->yres;
 296         if ((int) set->xres_virtual > 0)
 297                 base->xres_virtual = set->xres_virtual;
 298         if ((int) set->yres_virtual > 0)
 299                 base->yres_virtual = set->yres_virtual;
 300         if ((int) set->bits_per_pixel > 0)
 301                 base->bits_per_pixel = set->bits_per_pixel;
 302 }
 303
 304 static void showmode(struct fb_var_screeninfo *v)
 305 {
 306         double drate = 0, hrate = 0, vrate = 0;
 307
 308         if (v->pixclock) {
 309                 drate = 1e12 / v->pixclock;
 310                 hrate =
 311                         drate / (v->left_margin + v->xres + v->right_margin +
 312                                          v->hsync_len);
 313                 vrate =
 314                         hrate / (v->upper_margin + v->yres + v->lower_margin +
 315                                          v->vsync_len);
 316         }
 317         printf("\nmode \"%ux%u-%u\"\n", v->xres, v->yres, (int) (vrate + 0.5));
 318 #ifdef BB_FEATURE_FBSET_FANCY
 319         printf("\t# D: %.3f MHz, H: %.3f kHz, V: %.3f Hz\n", drate / 1e6,
 320                    hrate / 1e3, vrate);
 321 #endif
 322         printf("\tgeometry %u %u %u %u %u\n", v->xres, v->yres,
 323                    v->xres_virtual, v->yres_virtual, v->bits_per_pixel);
 324         printf("\ttimings %u %u %u %u %u %u %u\n", v->pixclock, v->left_margin,
 325                    v->right_margin, v->upper_margin, v->lower_margin, v->hsync_len,
 326                    v->vsync_len);
 327         printf("\taccel %s\n", (v->accel_flags > 0 ? "true" : "false"));
 328         printf("\trgba %u/%u,%u/%u,%u/%u,%u/%u\n", v->red.length,
 329                    v->red.offset, v->green.length, v->green.offset, v->blue.length,
 330                    v->blue.offset, v->transp.length, v->transp.offset);
 331         printf("endmode\n\n");
 332 }
 333
 334 static void fbset_usage(void)
 335 {
 336 #ifndef BB_FEATURE_TRIVIAL_HELP
 337         int i;
 338 #endif
 339
 340 #ifndef STANDALONE
 341         fprintf(stderr, "BusyBox v%s (%s) multi-call binary -- GPL2\n\n",
 342                         BB_VER, BB_BT);
 343 #endif
 344         fprintf(stderr, "Usage: fbset [options] [mode]\n");
 345 #ifndef BB_FEATURE_TRIVIAL_HELP
 346         fprintf(stderr, "\nShows and modifies frame buffer device settings\n\n");
 347         fprintf(stderr, "The following options are recognized:\n");
 348         for (i = 0; g_cmdoptions[i].name; i++)
 349                 fprintf(stderr, "\t%s\n", g_cmdoptions[i].name);
 350 #endif
 351         exit(-1);
 352 }
 353
 354 #ifdef STANDALONE
 355 int main(int argc, char **argv)
 356 #else
 357 extern int fbset_main(int argc, char **argv)
 358 #endif
 359 {
 360         struct fb_var_screeninfo var, varset;
 361         int fh, i;
 362         char *fbdev = DEFAULTFBDEV;
 363         char *modefile = DEFAULTFBMODE;
 364         char *thisarg, *mode = NULL;
 365
 366         memset(&varset, 0xFF, sizeof(varset));
 367
 368         /* parse cmd args.... why do they have to make things so difficult? */
 369         argv++;
 370         argc--;
 371         for (; argc > 0 && (thisarg = *argv); argc--, argv++) {
 372                 for (i = 0; g_cmdoptions[i].name; i++) {
 373                         if (!strcmp(thisarg, g_cmdoptions[i].name)) {
 374                                 if (argc - 1 < g_cmdoptions[i].param_count)
 375                                         fbset_usage();
 376                                 switch (g_cmdoptions[i].code) {
 377                                 case CMD_HELP:
 378                                         fbset_usage();
 379                                 case CMD_FB:
 380                                         fbdev = argv[1];
 381                                         break;
 382                                 case CMD_DB:
 383                                         modefile = argv[1];
 384                                         break;
 385                                 case CMD_GEOMETRY:
 386                                         varset.xres = strtoul(argv[1], 0, 0);
 387                                         varset.yres = strtoul(argv[2], 0, 0);
 388                                         varset.xres_virtual = strtoul(argv[3], 0, 0);
 389                                         varset.yres_virtual = strtoul(argv[4], 0, 0);
 390                                         varset.bits_per_pixel = strtoul(argv[5], 0, 0);
 391                                         break;
 392                                 case CMD_TIMING:
 393                                         varset.pixclock = strtoul(argv[1], 0, 0);
 394                                         varset.left_margin = strtoul(argv[2], 0, 0);
 395                                         varset.right_margin = strtoul(argv[3], 0, 0);
 396                                         varset.upper_margin = strtoul(argv[4], 0, 0);
 397                                         varset.lower_margin = strtoul(argv[5], 0, 0);
 398                                         varset.hsync_len = strtoul(argv[6], 0, 0);
 399                                         varset.vsync_len = strtoul(argv[7], 0, 0);
 400                                         break;
 401                 case CMD_CHANGE:
 402                     g_options |= OPT_CHANGE;
 403                     break;
 404 #ifdef BB_FEATURE_FBSET_FANCY
 405                                 case CMD_XRES:
 406                                         varset.xres = strtoul(argv[1], 0, 0);
 407                                         break;
 408                                 case CMD_YRES:
 409                                         varset.yres = strtoul(argv[1], 0, 0);
 410                                         break;
 411 #endif
 412                                 }
 413                                 argc -= g_cmdoptions[i].param_count;
 414                                 argv += g_cmdoptions[i].param_count;
 415                                 break;
 416                         }
 417                 }
 418                 if (!g_cmdoptions[i].name) {
 419                         if (argc == 1) {
 420                                 mode = *argv;
 421                                 g_options |= OPT_READMODE;
 422                         } else {
 423                                 fbset_usage();
 424                         }
 425                 }
 426         }
 427
 428         if ((fh = open(fbdev, O_RDONLY)) < 0)
 429                 perror_msg_and_die("fbset(open)");
 430         if (ioctl(fh, FBIOGET_VSCREENINFO, &var))
 431                 perror_msg_and_die("fbset(ioctl)");
 432         if (g_options & OPT_READMODE) {
 433                 if (!readmode(&var, modefile, mode)) {
 434                         error_msg("Unknown video mode `%s'\n", mode);
 435                         return EXIT_FAILURE;
 436                 }
 437         }
 438
 439         setmode(&var, &varset);
 440         if (g_options & OPT_CHANGE)
 441                 if (ioctl(fh, FBIOPUT_VSCREENINFO, &var))
 442                         perror_msg_and_die("fbset(ioctl)");
 443         showmode(&var);
 444         /* Don't close the file, as exiting will take care of that */
 445         /* close(fh); */
 446
 447         return EXIT_SUCCESS;
 448 }