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 PERROR(ctx)   do { perror(ctx); exit(1); } while(0)
  37
  38 #define DEFAULTFBDEV  "/dev/fb0"
  39 #define DEFAULTFBMODE "/etc/fb.modes"
  40
  41 #define OPT_CHANGE    1
  42 #define OPT_INFO      (1 << 1)
  43 #define OPT_READMODE  (1 << 2)
  44
  45 #define CMD_HELP        0
  46 #define CMD_FB          1
  47 #define CMD_DB          2
  48 #define CMD_GEOMETRY    3
  49 #define CMD_TIMING      4
  50 #define CMD_ACCEL       5
  51 #define CMD_HSYNC       6
  52 #define CMD_VSYNC       7
  53 #define CMD_LACED       8
  54 #define CMD_DOUBLE      9
  55 /* #define CMD_XCOMPAT     10 */
  56 #define CMD_ALL         11
  57 #define CMD_INFO        12
  58 #define CMD_CHANGE      13
  59
  60 #ifdef BB_FEATURE_FBSET_FANCY
  61 #define CMD_XRES        100
  62 #define CMD_YRES        101
  63 #define CMD_VXRES       102
  64 #define CMD_VYRES       103
  65 #define CMD_DEPTH       104
  66 #define CMD_MATCH       105
  67 #define CMD_PIXCLOCK    106
  68 #define CMD_LEFT        107
  69 #define CMD_RIGHT       108
  70 #define CMD_UPPER       109
  71 #define CMD_LOWER       110
  72 #define CMD_HSLEN       111
  73 #define CMD_VSLEN       112
  74 #define CMD_CSYNC       113
  75 #define CMD_GSYNC       114
  76 #define CMD_EXTSYNC     115
  77 #define CMD_BCAST       116
  78 #define CMD_RGBA        117
  79 #define CMD_STEP        118
  80 #define CMD_MOVE        119
  81 #endif
  82
  83 static unsigned int g_options = 0;
  84
  85 /* Stuff stolen from the kernel's fb.h */
  86 #define FBIOGET_VSCREENINFO     0x4600
  87 #define FBIOPUT_VSCREENINFO     0x4601
  88 #define __u32                   unsigned int
  89 struct fb_bitfield {
  90         __u32 offset;                   /* beginning of bitfield        */
  91         __u32 length;                   /* length of bitfield           */
  92         __u32 msb_right;                /* != 0 : Most significant bit is */
  93                                         /* right */
  94 };
  95 struct fb_var_screeninfo {
  96         __u32 xres;                     /* visible resolution           */
  97         __u32 yres;
  98         __u32 xres_virtual;             /* virtual resolution           */
  99         __u32 yres_virtual;
 100         __u32 xoffset;                  /* offset from virtual to visible */
 101         __u32 yoffset;                  /* resolution                   */
 102
 103         __u32 bits_per_pixel;           /* guess what                   */
 104         __u32 grayscale;                /* != 0 Graylevels instead of colors */
 105
 106         struct fb_bitfield red;         /* bitfield in fb mem if true color, */
 107         struct fb_bitfield green;       /* else only length is significant */
 108         struct fb_bitfield blue;
 109         struct fb_bitfield transp;      /* transparency                 */
 110
 111         __u32 nonstd;                   /* != 0 Non standard pixel format */
 112
 113         __u32 activate;                 /* see FB_ACTIVATE_*            */
 114
 115         __u32 height;                   /* height of picture in mm    */
 116         __u32 width;                    /* width of picture in mm     */
 117
 118         __u32 accel_flags;              /* acceleration flags (hints)   */
 119
 120         /* Timing: All values in pixclocks, except pixclock (of course) */
 121         __u32 pixclock;                 /* pixel clock in ps (pico seconds) */
 122         __u32 left_margin;              /* time from sync to picture    */
 123         __u32 right_margin;             /* time from picture to sync    */
 124         __u32 upper_margin;             /* time from sync to picture    */
 125         __u32 lower_margin;
 126         __u32 hsync_len;                /* length of horizontal sync    */
 127         __u32 vsync_len;                /* length of vertical sync      */
 128         __u32 sync;                     /* see FB_SYNC_*                */
 129         __u32 vmode;                    /* see FB_VMODE_*               */
 130         __u32 reserved[6];              /* Reserved for future compatibility */
 131 };
 132
 133
 134 struct cmdoptions_t {
 135         char *name;
 136         unsigned char param_count;
 137         unsigned char code;
 138 } g_cmdoptions[] = {
 139         {
 140         "-h", 0, CMD_HELP}, {
 141         "-fb", 1, CMD_FB}, {
 142         "-db", 1, CMD_DB}, {
 143         "-a", 0, CMD_ALL}, {
 144         "-i", 0, CMD_INFO}, {
 145         "-g", 5, CMD_GEOMETRY}, {
 146         "-t", 7, CMD_TIMING}, {
 147         "-accel", 1, CMD_ACCEL}, {
 148         "-hsync", 1, CMD_HSYNC}, {
 149         "-vsync", 1, CMD_VSYNC}, {
 150         "-laced", 1, CMD_LACED}, {
 151         "-double", 1, CMD_DOUBLE}, {
 152         "-help", 0, CMD_HELP}, {
 153         "-n", 0, CMD_CHANGE}, {
 154 #ifdef BB_FEATURE_FBSET_FANCY
 155         "-help", 0, CMD_HELP}, {
 156         "-all", 0, CMD_ALL}, {
 157         "-xres", 1, CMD_XRES}, {
 158         "-yres", 1, CMD_YRES}, {
 159         "-vxres", 1, CMD_VXRES}, {
 160         "-vyres", 1, CMD_VYRES}, {
 161         "-depth", 1, CMD_DEPTH}, {
 162         "-match", 0, CMD_MATCH}, {
 163         "-geometry", 5, CMD_GEOMETRY}, {
 164         "-pixclock", 1, CMD_PIXCLOCK}, {
 165         "-left", 1, CMD_LEFT}, {
 166         "-right", 1, CMD_RIGHT}, {
 167         "-upper", 1, CMD_UPPER}, {
 168         "-lower", 1, CMD_LOWER}, {
 169         "-hslen", 1, CMD_HSLEN}, {
 170         "-vslen", 1, CMD_VSLEN}, {
 171         "-timings", 7, CMD_TIMING}, {
 172         "-csync", 1, CMD_CSYNC}, {
 173         "-gsync", 1, CMD_GSYNC}, {
 174         "-extsync", 1, CMD_EXTSYNC}, {
 175         "-bcast", 1, CMD_BCAST}, {
 176         "-rgba", 1, CMD_RGBA}, {
 177         "-step", 1, CMD_STEP}, {
 178         "-move", 1, CMD_MOVE}, {
 179 #endif
 180         0, 0, 0}
 181 };
 182
 183 #ifdef BB_FEATURE_FBSET_READMODE
 184 /* taken from linux/fb.h */
 185 #define FB_VMODE_INTERLACED     1       /* interlaced   */
 186 #define FB_VMODE_DOUBLE         2       /* double scan */
 187 #define FB_SYNC_HOR_HIGH_ACT    1       /* horizontal sync high active  */
 188 #define FB_SYNC_VERT_HIGH_ACT   2       /* vertical sync high active    */
 189 #define FB_SYNC_EXT             4       /* external sync                */
 190 #define FB_SYNC_COMP_HIGH_ACT   8       /* composite sync high active   */
 191 #endif
 192 static int readmode(struct fb_var_screeninfo *base, const char *fn,
 193                                         const char *mode)
 194 {
 195 #ifdef BB_FEATURE_FBSET_READMODE
 196         FILE *f;
 197         char buf[256];
 198         char *p = buf;
 199
 200         if ((f = fopen(fn, "r")) == NULL)
 201                 PERROR("readmode(fopen)");
 202         while (!feof(f)) {
 203                 fgets(buf, sizeof(buf), f);
 204                 if ((p = strstr(buf, "mode ")) || (p = strstr(buf, "mode\t"))) {
 205                         p += 5;
 206                         if ((p = strstr(buf, mode))) {
 207                                 p += strlen(mode);
 208                                 if (!isspace(*p) && (*p != 0) && (*p != '"')
 209                                         && (*p != '\r') && (*p != '\n'))
 210                                         continue;       /* almost, but not quite */
 211                                 while (!feof(f)) {
 212                                         fgets(buf, sizeof(buf), f);
 213
 214                     if ((p = strstr(buf, "geometry "))) {
 215                         p += 9;
 216
 217                         sscanf(p, "%d %d %d %d %d",
 218                                 &(base->xres), &(base->yres),
 219                                 &(base->xres_virtual), &(base->yres_virtual),
 220                                 &(base->bits_per_pixel));
 221                     } else if ((p = strstr(buf, "timings "))) {
 222                         p += 8;
 223
 224                         sscanf(p, "%d %d %d %d %d %d %d",
 225                                 &(base->pixclock),
 226                                 &(base->left_margin), &(base->right_margin),
 227                                 &(base->upper_margin), &(base->lower_margin),
 228                                 &(base->hsync_len), &(base->vsync_len));
 229                     } else if ((p = strstr(buf, "laced "))) {
 230                         p += 6;
 231
 232                         if (strstr(buf, "false")) {
 233                             base->vmode &= ~FB_VMODE_INTERLACED;
 234                         } else {
 235                             base->vmode |= FB_VMODE_INTERLACED;
 236                         }
 237                     } else if ((p = strstr(buf, "double "))) {
 238                         p += 7;
 239
 240                         if (strstr(buf, "false")) {
 241                             base->vmode &= ~FB_VMODE_DOUBLE;
 242                         } else {
 243                             base->vmode |= FB_VMODE_DOUBLE;
 244                         }
 245                     } else if ((p = strstr(buf, "vsync "))) {
 246                         p += 6;
 247
 248                         if (strstr(buf, "low")) {
 249                             base->sync &= ~FB_SYNC_VERT_HIGH_ACT;
 250                         } else {
 251                             base->sync |= FB_SYNC_VERT_HIGH_ACT;
 252                         }
 253                     } else if ((p = strstr(buf, "hsync "))) {
 254                         p += 6;
 255
 256                         if (strstr(buf, "low")) {
 257                             base->sync &= ~FB_SYNC_HOR_HIGH_ACT;
 258                         } else {
 259                             base->sync |= FB_SYNC_HOR_HIGH_ACT;
 260                         }
 261                     } else if ((p = strstr(buf, "csync "))) {
 262                         p += 6;
 263
 264                         if (strstr(buf, "low")) {
 265                             base->sync &= ~FB_SYNC_COMP_HIGH_ACT;
 266                         } else {
 267                             base->sync |= FB_SYNC_COMP_HIGH_ACT;
 268                         }
 269                     } else if ((p = strstr(buf, "extsync "))) {
 270                         p += 8;
 271
 272                         if (strstr(buf, "false")) {
 273                             base->sync &= ~FB_SYNC_EXT;
 274                         } else {
 275                             base->sync |= FB_SYNC_EXT;
 276                         }
 277                     }
 278
 279                                         if (strstr(buf, "endmode"))
 280                                                 return 1;
 281                                 }
 282                         }
 283                 }
 284         }
 285 #else
 286         error_msg( "mode reading not compiled in\n");
 287 #endif
 288         return 0;
 289 }
 290
 291 static void setmode(struct fb_var_screeninfo *base,
 292                                         struct fb_var_screeninfo *set)
 293 {
 294         if ((int) set->xres > 0)
 295                 base->xres = set->xres;
 296         if ((int) set->yres > 0)
 297                 base->yres = set->yres;
 298         if ((int) set->xres_virtual > 0)
 299                 base->xres_virtual = set->xres_virtual;
 300         if ((int) set->yres_virtual > 0)
 301                 base->yres_virtual = set->yres_virtual;
 302         if ((int) set->bits_per_pixel > 0)
 303                 base->bits_per_pixel = set->bits_per_pixel;
 304 }
 305
 306 static void showmode(struct fb_var_screeninfo *v)
 307 {
 308         double drate = 0, hrate = 0, vrate = 0;
 309
 310         if (v->pixclock) {
 311                 drate = 1e12 / v->pixclock;
 312                 hrate =
 313                         drate / (v->left_margin + v->xres + v->right_margin +
 314                                          v->hsync_len);
 315                 vrate =
 316                         hrate / (v->upper_margin + v->yres + v->lower_margin +
 317                                          v->vsync_len);
 318         }
 319         printf("\nmode \"%ux%u-%u\"\n", v->xres, v->yres, (int) (vrate + 0.5));
 320 #ifdef BB_FEATURE_FBSET_FANCY
 321         printf("\t# D: %.3f MHz, H: %.3f kHz, V: %.3f Hz\n", drate / 1e6,
 322                    hrate / 1e3, vrate);
 323 #endif
 324         printf("\tgeometry %u %u %u %u %u\n", v->xres, v->yres,
 325                    v->xres_virtual, v->yres_virtual, v->bits_per_pixel);
 326         printf("\ttimings %u %u %u %u %u %u %u\n", v->pixclock, v->left_margin,
 327                    v->right_margin, v->upper_margin, v->lower_margin, v->hsync_len,
 328                    v->vsync_len);
 329         printf("\taccel %s\n", (v->accel_flags > 0 ? "true" : "false"));
 330         printf("\trgba %u/%u,%u/%u,%u/%u,%u/%u\n", v->red.length,
 331                    v->red.offset, v->green.length, v->green.offset, v->blue.length,
 332                    v->blue.offset, v->transp.length, v->transp.offset);
 333         printf("endmode\n\n");
 334 }
 335
 336 static void fbset_usage(void)
 337 {
 338 #ifndef BB_FEATURE_TRIVIAL_HELP
 339         int i;
 340 #endif
 341
 342 #ifndef STANDALONE
 343         fprintf(stderr, "BusyBox v%s (%s) multi-call binary -- GPL2\n\n",
 344                         BB_VER, BB_BT);
 345 #endif
 346         fprintf(stderr, "Usage: fbset [options] [mode]\n");
 347 #ifndef BB_FEATURE_TRIVIAL_HELP
 348         fprintf(stderr, "\nShows and modifies frame buffer device settings\n\n");
 349         fprintf(stderr, "The following options are recognized:\n");
 350         for (i = 0; g_cmdoptions[i].name; i++)
 351                 fprintf(stderr, "\t%s\n", g_cmdoptions[i].name);
 352 #endif
 353         exit(-1);
 354 }
 355
 356 #ifdef STANDALONE
 357 int main(int argc, char **argv)
 358 #else
 359 extern int fbset_main(int argc, char **argv)
 360 #endif
 361 {
 362         struct fb_var_screeninfo var, varset;
 363         int fh, i;
 364         char *fbdev = DEFAULTFBDEV;
 365         char *modefile = DEFAULTFBMODE;
 366         char *thisarg, *mode = NULL;
 367
 368         memset(&varset, 0xFF, sizeof(varset));
 369
 370         /* parse cmd args.... why do they have to make things so difficult? */
 371         argv++;
 372         argc--;
 373         for (; argc > 0 && (thisarg = *argv); argc--, argv++) {
 374                 for (i = 0; g_cmdoptions[i].name; i++) {
 375                         if (!strcmp(thisarg, g_cmdoptions[i].name)) {
 376                                 if (argc - 1 < g_cmdoptions[i].param_count)
 377                                         fbset_usage();
 378                                 switch (g_cmdoptions[i].code) {
 379                                 case CMD_HELP:
 380                                         fbset_usage();
 381                                 case CMD_FB:
 382                                         fbdev = argv[1];
 383                                         break;
 384                                 case CMD_DB:
 385                                         modefile = argv[1];
 386                                         break;
 387                                 case CMD_GEOMETRY:
 388                                         varset.xres = strtoul(argv[1], 0, 0);
 389                                         varset.yres = strtoul(argv[2], 0, 0);
 390                                         varset.xres_virtual = strtoul(argv[3], 0, 0);
 391                                         varset.yres_virtual = strtoul(argv[4], 0, 0);
 392                                         varset.bits_per_pixel = strtoul(argv[5], 0, 0);
 393                                         break;
 394                                 case CMD_TIMING:
 395                                         varset.pixclock = strtoul(argv[1], 0, 0);
 396                                         varset.left_margin = strtoul(argv[2], 0, 0);
 397                                         varset.right_margin = strtoul(argv[3], 0, 0);
 398                                         varset.upper_margin = strtoul(argv[4], 0, 0);
 399                                         varset.lower_margin = strtoul(argv[5], 0, 0);
 400                                         varset.hsync_len = strtoul(argv[6], 0, 0);
 401                                         varset.vsync_len = strtoul(argv[7], 0, 0);
 402                                         break;
 403                 case CMD_CHANGE:
 404                     g_options |= OPT_CHANGE;
 405                     break;
 406 #ifdef BB_FEATURE_FBSET_FANCY
 407                                 case CMD_XRES:
 408                                         varset.xres = strtoul(argv[1], 0, 0);
 409                                         break;
 410                                 case CMD_YRES:
 411                                         varset.yres = strtoul(argv[1], 0, 0);
 412                                         break;
 413 #endif
 414                                 }
 415                                 argc -= g_cmdoptions[i].param_count;
 416                                 argv += g_cmdoptions[i].param_count;
 417                                 break;
 418                         }
 419                 }
 420                 if (!g_cmdoptions[i].name) {
 421                         if (argc == 1) {
 422                                 mode = *argv;
 423                                 g_options |= OPT_READMODE;
 424                         } else {
 425                                 fbset_usage();
 426                         }
 427                 }
 428         }
 429
 430         if ((fh = open(fbdev, O_RDONLY)) < 0)
 431                 PERROR("fbset(open)");
 432         if (ioctl(fh, FBIOGET_VSCREENINFO, &var))
 433                 PERROR("fbset(ioctl)");
 434         if (g_options & OPT_READMODE) {
 435                 if (!readmode(&var, modefile, mode)) {
 436                         error_msg("Unknown video mode `%s'\n", mode);
 437                         return EXIT_FAILURE;
 438                 }
 439         }
 440
 441         setmode(&var, &varset);
 442         if (g_options & OPT_CHANGE)
 443                 if (ioctl(fh, FBIOPUT_VSCREENINFO, &var))
 444                         PERROR("fbset(ioctl)");
 445         showmode(&var);
 446         /* Don't close the file, as exiting will take care of that */
 447         /* close(fh); */
 448
 449         return EXIT_SUCCESS;
 450 }