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