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  * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
   8  *
   9  * This is a from-scratch implementation of fbset; but the de facto fbset
  10  * implementation was a good reference. fbset (original) is released under
  11  * the GPL, and is (c) 1995-1999 by:
  12  *     Geert Uytterhoeven (Geert.Uytterhoeven@cs.kuleuven.ac.be)
  13  */
  14
  15 #include <stdio.h>
  16 #include <stdlib.h>
  17 #include <unistd.h>
  18 #include <fcntl.h>
  19 #include <errno.h>
  20 #include <ctype.h>
  21 #include <string.h>
  22 #include <stdint.h>
  23 #include <sys/ioctl.h>
  24 #include "busybox.h"
  25
  26 #define DEFAULTFBDEV  FB_0
  27 #define DEFAULTFBMODE "/etc/fb.modes"
  28
  29 enum {
  30         OPT_CHANGE   = (1 << 0),
  31         OPT_INFO     = (1 << 1),
  32         OPT_READMODE = (1 << 2),
  33
  34         CMD_FB = 1,
  35         CMD_DB = 2,
  36         CMD_GEOMETRY = 3,
  37         CMD_TIMING = 4,
  38         CMD_ACCEL = 5,
  39         CMD_HSYNC = 6,
  40         CMD_VSYNC = 7,
  41         CMD_LACED = 8,
  42         CMD_DOUBLE = 9,
  43 /*      CMD_XCOMPAT =     10, */
  44         CMD_ALL = 11,
  45         CMD_INFO = 12,
  46         CMD_CHANGE = 13,
  47
  48 #ifdef CONFIG_FEATURE_FBSET_FANCY
  49         CMD_XRES = 100,
  50         CMD_YRES = 101,
  51         CMD_VXRES = 102,
  52         CMD_VYRES = 103,
  53         CMD_DEPTH = 104,
  54         CMD_MATCH = 105,
  55         CMD_PIXCLOCK = 106,
  56         CMD_LEFT = 107,
  57         CMD_RIGHT = 108,
  58         CMD_UPPER = 109,
  59         CMD_LOWER = 110,
  60         CMD_HSLEN = 111,
  61         CMD_VSLEN = 112,
  62         CMD_CSYNC = 113,
  63         CMD_GSYNC = 114,
  64         CMD_EXTSYNC = 115,
  65         CMD_BCAST = 116,
  66         CMD_RGBA = 117,
  67         CMD_STEP = 118,
  68         CMD_MOVE = 119,
  69 #endif
  70 };
  71
  72 static unsigned int g_options = 0;
  73
  74 /* Stuff stolen from the kernel's fb.h */
  75 enum {
  76         FBIOGET_VSCREENINFO = 0x4600,
  77         FBIOPUT_VSCREENINFO = 0x4601
  78 };
  79 struct fb_bitfield {
  80         uint32_t offset;                        /* beginning of bitfield        */
  81         uint32_t length;                        /* length of bitfield           */
  82         uint32_t msb_right;             /* != 0 : Most significant bit is */
  83                                         /* right */
  84 };
  85 struct fb_var_screeninfo {
  86         uint32_t xres;                  /* visible resolution           */
  87         uint32_t yres;
  88         uint32_t xres_virtual;          /* virtual resolution           */
  89         uint32_t yres_virtual;
  90         uint32_t xoffset;                       /* offset from virtual to visible */
  91         uint32_t yoffset;                       /* resolution                   */
  92
  93         uint32_t bits_per_pixel;                /* guess what                   */
  94         uint32_t grayscale;             /* != 0 Graylevels instead of colors */
  95
  96         struct fb_bitfield red;         /* bitfield in fb mem if true color, */
  97         struct fb_bitfield green;       /* else only length is significant */
  98         struct fb_bitfield blue;
  99         struct fb_bitfield transp;      /* transparency                 */
 100
 101         uint32_t nonstd;                        /* != 0 Non standard pixel format */
 102
 103         uint32_t activate;                      /* see FB_ACTIVATE_*            */
 104
 105         uint32_t height;                        /* height of picture in mm    */
 106         uint32_t width;                 /* width of picture in mm     */
 107
 108         uint32_t accel_flags;           /* acceleration flags (hints)   */
 109
 110         /* Timing: All values in pixclocks, except pixclock (of course) */
 111         uint32_t pixclock;                      /* pixel clock in ps (pico seconds) */
 112         uint32_t left_margin;           /* time from sync to picture    */
 113         uint32_t right_margin;          /* time from picture to sync    */
 114         uint32_t upper_margin;          /* time from sync to picture    */
 115         uint32_t lower_margin;
 116         uint32_t hsync_len;             /* length of horizontal sync    */
 117         uint32_t vsync_len;             /* length of vertical sync      */
 118         uint32_t sync;                  /* see FB_SYNC_*                */
 119         uint32_t vmode;                 /* see FB_VMODE_*               */
 120         uint32_t reserved[6];           /* Reserved for future compatibility */
 121 };
 122
 123
 124 static const struct cmdoptions_t {
 125         const char *name;
 126         const unsigned char param_count;
 127         const unsigned char code;
 128 } g_cmdoptions[] = {
 129         {
 130         "-fb", 1, CMD_FB}, {
 131         "-db", 1, CMD_DB}, {
 132         "-a", 0, CMD_ALL}, {
 133         "-i", 0, CMD_INFO}, {
 134         "-g", 5, CMD_GEOMETRY}, {
 135         "-t", 7, CMD_TIMING}, {
 136         "-accel", 1, CMD_ACCEL}, {
 137         "-hsync", 1, CMD_HSYNC}, {
 138         "-vsync", 1, CMD_VSYNC}, {
 139         "-laced", 1, CMD_LACED}, {
 140         "-double", 1, CMD_DOUBLE}, {
 141         "-n", 0, CMD_CHANGE}, {
 142 #ifdef CONFIG_FEATURE_FBSET_FANCY
 143         "-all", 0, CMD_ALL}, {
 144         "-xres", 1, CMD_XRES}, {
 145         "-yres", 1, CMD_YRES}, {
 146         "-vxres", 1, CMD_VXRES}, {
 147         "-vyres", 1, CMD_VYRES}, {
 148         "-depth", 1, CMD_DEPTH}, {
 149         "-match", 0, CMD_MATCH}, {
 150         "-geometry", 5, CMD_GEOMETRY}, {
 151         "-pixclock", 1, CMD_PIXCLOCK}, {
 152         "-left", 1, CMD_LEFT}, {
 153         "-right", 1, CMD_RIGHT}, {
 154         "-upper", 1, CMD_UPPER}, {
 155         "-lower", 1, CMD_LOWER}, {
 156         "-hslen", 1, CMD_HSLEN}, {
 157         "-vslen", 1, CMD_VSLEN}, {
 158         "-timings", 7, CMD_TIMING}, {
 159         "-csync", 1, CMD_CSYNC}, {
 160         "-gsync", 1, CMD_GSYNC}, {
 161         "-extsync", 1, CMD_EXTSYNC}, {
 162         "-bcast", 1, CMD_BCAST}, {
 163         "-rgba", 1, CMD_RGBA}, {
 164         "-step", 1, CMD_STEP}, {
 165         "-move", 1, CMD_MOVE}, {
 166 #endif
 167         0, 0, 0}
 168 };
 169
 170 #ifdef CONFIG_FEATURE_FBSET_READMODE
 171 /* taken from linux/fb.h */
 172 enum {
 173         FB_VMODE_INTERLACED = 1,        /* interlaced   */
 174         FB_VMODE_DOUBLE = 2,    /* double scan */
 175         FB_SYNC_HOR_HIGH_ACT = 1,       /* horizontal sync high active  */
 176         FB_SYNC_VERT_HIGH_ACT = 2,      /* vertical sync high active    */
 177         FB_SYNC_EXT = 4,        /* external sync                */
 178         FB_SYNC_COMP_HIGH_ACT = 8       /* composite sync high active   */
 179 };
 180 #endif
 181 static int readmode(struct fb_var_screeninfo *base, const char *fn,
 182                                         const char *mode)
 183 {
 184 #ifdef CONFIG_FEATURE_FBSET_READMODE
 185         FILE *f;
 186         char buf[256];
 187         char *p = buf;
 188
 189         f = bb_xfopen(fn, "r");
 190         while (!feof(f)) {
 191                 fgets(buf, sizeof(buf), f);
 192                 if ((p = strstr(buf, "mode ")) || (p = strstr(buf, "mode\t"))) {
 193                         p += 5;
 194                         if ((p = strstr(buf, mode))) {
 195                                 p += strlen(mode);
 196                                 if (!isspace(*p) && (*p != 0) && (*p != '"')
 197                                         && (*p != '\r') && (*p != '\n'))
 198                                         continue;       /* almost, but not quite */
 199                                 while (!feof(f)) {
 200                                         fgets(buf, sizeof(buf), f);
 201
 202                     if ((p = strstr(buf, "geometry "))) {
 203                         p += 9;
 204
 205                         sscanf(p, "%d %d %d %d %d",
 206                                 &(base->xres), &(base->yres),
 207                                 &(base->xres_virtual), &(base->yres_virtual),
 208                                 &(base->bits_per_pixel));
 209                     } else if ((p = strstr(buf, "timings "))) {
 210                         p += 8;
 211
 212                         sscanf(p, "%d %d %d %d %d %d %d",
 213                                 &(base->pixclock),
 214                                 &(base->left_margin), &(base->right_margin),
 215                                 &(base->upper_margin), &(base->lower_margin),
 216                                 &(base->hsync_len), &(base->vsync_len));
 217                     } else if ((p = strstr(buf, "laced "))) {
 218                         p += 6;
 219
 220                         if (strstr(buf, "false")) {
 221                             base->vmode &= ~FB_VMODE_INTERLACED;
 222                         } else {
 223                             base->vmode |= FB_VMODE_INTERLACED;
 224                         }
 225                     } else if ((p = strstr(buf, "double "))) {
 226                         p += 7;
 227
 228                         if (strstr(buf, "false")) {
 229                             base->vmode &= ~FB_VMODE_DOUBLE;
 230                         } else {
 231                             base->vmode |= FB_VMODE_DOUBLE;
 232                         }
 233                     } else if ((p = strstr(buf, "vsync "))) {
 234                         p += 6;
 235
 236                         if (strstr(buf, "low")) {
 237                             base->sync &= ~FB_SYNC_VERT_HIGH_ACT;
 238                         } else {
 239                             base->sync |= FB_SYNC_VERT_HIGH_ACT;
 240                         }
 241                     } else if ((p = strstr(buf, "hsync "))) {
 242                         p += 6;
 243
 244                         if (strstr(buf, "low")) {
 245                             base->sync &= ~FB_SYNC_HOR_HIGH_ACT;
 246                         } else {
 247                             base->sync |= FB_SYNC_HOR_HIGH_ACT;
 248                         }
 249                     } else if ((p = strstr(buf, "csync "))) {
 250                         p += 6;
 251
 252                         if (strstr(buf, "low")) {
 253                             base->sync &= ~FB_SYNC_COMP_HIGH_ACT;
 254                         } else {
 255                             base->sync |= FB_SYNC_COMP_HIGH_ACT;
 256                         }
 257                     } else if ((p = strstr(buf, "extsync "))) {
 258                         p += 8;
 259
 260                         if (strstr(buf, "false")) {
 261                             base->sync &= ~FB_SYNC_EXT;
 262                         } else {
 263                             base->sync |= FB_SYNC_EXT;
 264                         }
 265                     }
 266
 267                                         if (strstr(buf, "endmode"))
 268                                                 return 1;
 269                                 }
 270                         }
 271                 }
 272         }
 273 #else
 274         bb_error_msg( "mode reading not compiled in");
 275 #endif
 276         return 0;
 277 }
 278
 279 static inline void setmode(struct fb_var_screeninfo *base,
 280                                         struct fb_var_screeninfo *set)
 281 {
 282         if ((int) set->xres > 0)
 283                 base->xres = set->xres;
 284         if ((int) set->yres > 0)
 285                 base->yres = set->yres;
 286         if ((int) set->xres_virtual > 0)
 287                 base->xres_virtual = set->xres_virtual;
 288         if ((int) set->yres_virtual > 0)
 289                 base->yres_virtual = set->yres_virtual;
 290         if ((int) set->bits_per_pixel > 0)
 291                 base->bits_per_pixel = set->bits_per_pixel;
 292 }
 293
 294 static inline void showmode(struct fb_var_screeninfo *v)
 295 {
 296         double drate = 0, hrate = 0, vrate = 0;
 297
 298         if (v->pixclock) {
 299                 drate = 1e12 / v->pixclock;
 300                 hrate =
 301                         drate / (v->left_margin + v->xres + v->right_margin +
 302                                          v->hsync_len);
 303                 vrate =
 304                         hrate / (v->upper_margin + v->yres + v->lower_margin +
 305                                          v->vsync_len);
 306         }
 307         printf("\nmode \"%ux%u-%u\"\n"
 308 #ifdef CONFIG_FEATURE_FBSET_FANCY
 309         "\t# D: %.3f MHz, H: %.3f kHz, V: %.3f Hz\n"
 310 #endif
 311         "\tgeometry %u %u %u %u %u\n\ttimings %u %u %u %u %u %u %u\n\taccel %s\n\trgba %u/%u,%u/%u,%u/%u,%u/%u\nendmode\n\n",
 312                    v->xres, v->yres, (int) (vrate + 0.5),
 313 #ifdef CONFIG_FEATURE_FBSET_FANCY
 314                    drate / 1e6, hrate / 1e3, vrate,
 315 #endif
 316                    v->xres, v->yres, v->xres_virtual, v->yres_virtual,
 317                    v->bits_per_pixel, v->pixclock, v->left_margin,
 318                    v->right_margin, v->upper_margin, v->lower_margin, v->hsync_len,
 319                    v->vsync_len, (v->accel_flags > 0 ? "true" : "false"), v->red.length,
 320                    v->red.offset, v->green.length, v->green.offset, v->blue.length,
 321                    v->blue.offset, v->transp.length, v->transp.offset);
 322 }
 323
 324 #ifdef STANDALONE
 325 int main(int argc, char **argv)
 326 #else
 327 int fbset_main(int argc, char **argv)
 328 #endif
 329 {
 330         struct fb_var_screeninfo var, varset;
 331         int fh, i;
 332         char *fbdev = DEFAULTFBDEV;
 333         char *modefile = DEFAULTFBMODE;
 334         char *thisarg, *mode = NULL;
 335
 336         memset(&varset, 0xFF, sizeof(varset));
 337
 338         /* parse cmd args.... why do they have to make things so difficult? */
 339         argv++;
 340         argc--;
 341         for (; argc > 0 && (thisarg = *argv); argc--, argv++) {
 342                 for (i = 0; g_cmdoptions[i].name; i++) {
 343                         if (!strcmp(thisarg, g_cmdoptions[i].name)) {
 344                                 if (argc - 1 < g_cmdoptions[i].param_count)
 345                                         bb_show_usage();
 346                                 switch (g_cmdoptions[i].code) {
 347                                 case CMD_FB:
 348                                         fbdev = argv[1];
 349                                         break;
 350                                 case CMD_DB:
 351                                         modefile = argv[1];
 352                                         break;
 353                                 case CMD_GEOMETRY:
 354                                         varset.xres = strtoul(argv[1], 0, 0);
 355                                         varset.yres = strtoul(argv[2], 0, 0);
 356                                         varset.xres_virtual = strtoul(argv[3], 0, 0);
 357                                         varset.yres_virtual = strtoul(argv[4], 0, 0);
 358                                         varset.bits_per_pixel = strtoul(argv[5], 0, 0);
 359                                         break;
 360                                 case CMD_TIMING:
 361                                         varset.pixclock = strtoul(argv[1], 0, 0);
 362                                         varset.left_margin = strtoul(argv[2], 0, 0);
 363                                         varset.right_margin = strtoul(argv[3], 0, 0);
 364                                         varset.upper_margin = strtoul(argv[4], 0, 0);
 365                                         varset.lower_margin = strtoul(argv[5], 0, 0);
 366                                         varset.hsync_len = strtoul(argv[6], 0, 0);
 367                                         varset.vsync_len = strtoul(argv[7], 0, 0);
 368                                         break;
 369                 case CMD_CHANGE:
 370                     g_options |= OPT_CHANGE;
 371                     break;
 372 #ifdef CONFIG_FEATURE_FBSET_FANCY
 373                                 case CMD_XRES:
 374                                         varset.xres = strtoul(argv[1], 0, 0);
 375                                         break;
 376                                 case CMD_YRES:
 377                                         varset.yres = strtoul(argv[1], 0, 0);
 378                                         break;
 379                            case CMD_DEPTH:
 380                                         varset.bits_per_pixel = strtoul(argv[1], 0, 0);
 381                                         break;
 382 #endif
 383                                 }
 384                                 argc -= g_cmdoptions[i].param_count;
 385                                 argv += g_cmdoptions[i].param_count;
 386                                 break;
 387                         }
 388                 }
 389                 if (!g_cmdoptions[i].name) {
 390                         if (argc == 1) {
 391                                 mode = *argv;
 392                                 g_options |= OPT_READMODE;
 393                         } else {
 394                                 bb_show_usage();
 395                         }
 396                 }
 397         }
 398
 399         fh = bb_xopen(fbdev, O_RDONLY);
 400         if (ioctl(fh, FBIOGET_VSCREENINFO, &var))
 401                 bb_perror_msg_and_die("fbset(ioctl)");
 402         if (g_options & OPT_READMODE) {
 403                 if (!readmode(&var, modefile, mode)) {
 404                         bb_error_msg("Unknown video mode `%s'", mode);
 405                         return EXIT_FAILURE;
 406                 }
 407         }
 408
 409         setmode(&var, &varset);
 410         if (g_options & OPT_CHANGE)
 411                 if (ioctl(fh, FBIOPUT_VSCREENINFO, &var))
 412                         bb_perror_msg_and_die("fbset(ioctl)");
 413         showmode(&var);
 414         /* Don't close the file, as exiting will take care of that */
 415         /* close(fh); */
 416
 417         return EXIT_SUCCESS;
 418 }