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