LXR busybox/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 "libbb.h"
  16
  17#define DEFAULTFBDEV  FB_0
  18#define DEFAULTFBMODE "/etc/fb.modes"
  19
  20enum {
  21        CMD_FB = 1,
  22        CMD_DB = 2,
  23        CMD_GEOMETRY = 3,
  24        CMD_TIMING = 4,
  25        CMD_ACCEL = 5,
  26        CMD_HSYNC = 6,
  27        CMD_VSYNC = 7,
  28        CMD_LACED = 8,
  29        CMD_DOUBLE = 9,
  30/*      CMD_XCOMPAT =     10, */
  31        CMD_ALL = 11,
  32        CMD_INFO = 12,
  33        CMD_CHANGE = 13,
  34
  35#if ENABLE_FEATURE_FBSET_FANCY
  36        CMD_XRES = 100,
  37        CMD_YRES = 101,
  38        CMD_VXRES = 102,
  39        CMD_VYRES = 103,
  40        CMD_DEPTH = 104,
  41        CMD_MATCH = 105,
  42        CMD_PIXCLOCK = 106,
  43        CMD_LEFT = 107,
  44        CMD_RIGHT = 108,
  45        CMD_UPPER = 109,
  46        CMD_LOWER = 110,
  47        CMD_HSLEN = 111,
  48        CMD_VSLEN = 112,
  49        CMD_CSYNC = 113,
  50        CMD_GSYNC = 114,
  51        CMD_EXTSYNC = 115,
  52        CMD_BCAST = 116,
  53        CMD_RGBA = 117,
  54        CMD_STEP = 118,
  55        CMD_MOVE = 119,
  56#endif
  57};
  58
  59/* Stuff stolen from the kernel's fb.h */
  60#define FB_ACTIVATE_ALL 64
  61enum {
  62        FBIOGET_VSCREENINFO = 0x4600,
  63        FBIOPUT_VSCREENINFO = 0x4601
  64};
  65struct fb_bitfield {
  66        uint32_t offset;                /* beginning of bitfield */
  67        uint32_t length;                /* length of bitfield */
  68        uint32_t msb_right;             /* !=0: Most significant bit is right */
  69};
  70struct fb_var_screeninfo {
  71        uint32_t xres;                  /* visible resolution */
  72        uint32_t yres;
  73        uint32_t xres_virtual;          /* virtual resolution */
  74        uint32_t yres_virtual;
  75        uint32_t xoffset;               /* offset from virtual to visible */
  76        uint32_t yoffset;               /* resolution */
  77
  78        uint32_t bits_per_pixel;
  79        uint32_t grayscale;             /* !=0 Graylevels instead of colors */
  80
  81        struct fb_bitfield red;         /* bitfield in fb mem if true color, */
  82        struct fb_bitfield green;       /* else only length is significant */
  83        struct fb_bitfield blue;
  84        struct fb_bitfield transp;      /* transparency */
  85
  86        uint32_t nonstd;                /* !=0 Non standard pixel format */
  87
  88        uint32_t activate;              /* see FB_ACTIVATE_x */
  89
  90        uint32_t height;                /* height of picture in mm */
  91        uint32_t width;                 /* width of picture in mm */
  92
  93        uint32_t accel_flags;           /* acceleration flags (hints)   */
  94
  95        /* Timing: All values in pixclocks, except pixclock (of course) */
  96        uint32_t pixclock;              /* pixel clock in ps (pico seconds) */
  97        uint32_t left_margin;           /* time from sync to picture */
  98        uint32_t right_margin;          /* time from picture to sync */
  99        uint32_t upper_margin;          /* time from sync to picture */
 100        uint32_t lower_margin;
 101        uint32_t hsync_len;             /* length of horizontal sync */
 102        uint32_t vsync_len;             /* length of vertical sync */
 103        uint32_t sync;                  /* see FB_SYNC_x */
 104        uint32_t vmode;                 /* see FB_VMODE_x */
 105        uint32_t reserved[6];           /* Reserved for future compatibility */
 106};
 107
 108
 109static const struct cmdoptions_t {
 110        const char name[9];
 111        const unsigned char param_count;
 112        const unsigned char code;
 113} g_cmdoptions[] = {
 114        /*"12345678" + NUL */
 115        { "fb"      , 1, CMD_FB       },
 116        { "db"      , 1, CMD_DB       },
 117        { "a"       , 0, CMD_ALL      },
 118        { "i"       , 0, CMD_INFO     },
 119        { "g"       , 5, CMD_GEOMETRY },
 120        { "t"       , 7, CMD_TIMING   },
 121        { "accel"   , 1, CMD_ACCEL    },
 122        { "hsync"   , 1, CMD_HSYNC    },
 123        { "vsync"   , 1, CMD_VSYNC    },
 124        { "laced"   , 1, CMD_LACED    },
 125        { "double"  , 1, CMD_DOUBLE   },
 126        { "n"       , 0, CMD_CHANGE   },
 127#if ENABLE_FEATURE_FBSET_FANCY
 128        { "all"     , 0, CMD_ALL      },
 129        { "xres"    , 1, CMD_XRES     },
 130        { "yres"    , 1, CMD_YRES     },
 131        { "vxres"   , 1, CMD_VXRES    },
 132        { "vyres"   , 1, CMD_VYRES    },
 133        { "depth"   , 1, CMD_DEPTH    },
 134        { "match"   , 0, CMD_MATCH    },
 135        { "geometry", 5, CMD_GEOMETRY },
 136        { "pixclock", 1, CMD_PIXCLOCK },
 137        { "left"    , 1, CMD_LEFT     },
 138        { "right"   , 1, CMD_RIGHT    },
 139        { "upper"   , 1, CMD_UPPER    },
 140        { "lower"   , 1, CMD_LOWER    },
 141        { "hslen"   , 1, CMD_HSLEN    },
 142        { "vslen"   , 1, CMD_VSLEN    },
 143        { "timings" , 7, CMD_TIMING   },
 144        { "csync"   , 1, CMD_CSYNC    },
 145        { "gsync"   , 1, CMD_GSYNC    },
 146        { "extsync" , 1, CMD_EXTSYNC  },
 147        { "bcast"   , 1, CMD_BCAST    },
 148        { "rgba"    , 1, CMD_RGBA     },
 149        { "step"    , 1, CMD_STEP     },
 150        { "move"    , 1, CMD_MOVE     },
 151#endif
 152};
 153
 154#if ENABLE_FEATURE_FBSET_READMODE
 155/* taken from linux/fb.h */
 156enum {
 157        FB_VMODE_INTERLACED = 1,        /* interlaced */
 158        FB_VMODE_DOUBLE = 2,            /* double scan */
 159        FB_SYNC_HOR_HIGH_ACT = 1,       /* horizontal sync high active */
 160        FB_SYNC_VERT_HIGH_ACT = 2,      /* vertical sync high active */
 161        FB_SYNC_EXT = 4,                /* external sync */
 162        FB_SYNC_COMP_HIGH_ACT = 8,      /* composite sync high active */
 163};
 164#endif
 165
 166#if ENABLE_FEATURE_FBSET_READMODE
 167static void ss(uint32_t *x, uint32_t flag, char *buf, const char *what)
 168{
 169        if (strcmp(buf, what) == 0)
 170                *x &= ~flag;
 171        else
 172                *x |= flag;
 173}
 174
 175static int readmode(struct fb_var_screeninfo *base, const char *fn,
 176                                        const char *mode)
 177{
 178        char *token[2], *p, *s;
 179        parser_t *parser = config_open(fn);
 180
 181        while (config_read(parser, token, 2, 1, "# \t\r", PARSE_NORMAL)) {
 182                if (strcmp(token[0], "mode") != 0 || !token[1])
 183                        continue;
 184                p = strstr(token[1], mode);
 185                if (!p)
 186                        continue;
 187                s = p + strlen(mode);
 188                //bb_info_msg("CHECK[%s][%s][%d]", mode, p-1, *s);
 189                /* exact match? */
 190                if (((!*s || isspace(*s)) && '"' != s[-1]) /* end-of-token */
 191                 || ('"' == *s && '"' == p[-1]) /* ends with " but starts with " too! */
 192                ) {
 193                        //bb_info_msg("FOUND[%s][%s][%s][%d]", token[1], p, mode, isspace(*s));
 194                        break;
 195                }
 196        }
 197
 198        if (!token[0])
 199                return 0;
 200
 201        while (config_read(parser, token, 2, 1, "# \t", PARSE_NORMAL)) {
 202                int i;
 203
 204//bb_info_msg("???[%s][%s]", token[0], token[1]);
 205                if (strcmp(token[0], "endmode") == 0) {
 206//bb_info_msg("OK[%s]", mode);
 207                        return 1;
 208                }
 209                p = token[1];
 210                i = index_in_strings(
 211                        "geometry\0timings\0interlaced\0double\0vsync\0hsync\0csync\0extsync\0",
 212                        token[0]);
 213                switch (i) {
 214                case 0:
 215                        /* FIXME: catastrophic on arches with 64bit ints */
 216                        sscanf(p, "%d %d %d %d %d",
 217                                &(base->xres), &(base->yres),
 218                                &(base->xres_virtual), &(base->yres_virtual),
 219                                &(base->bits_per_pixel));
 220//bb_info_msg("GEO[%s]", p);
 221                        break;
 222                case 1:
 223                        sscanf(p, "%d %d %d %d %d %d %d",
 224                                &(base->pixclock),
 225                                &(base->left_margin), &(base->right_margin),
 226                                &(base->upper_margin), &(base->lower_margin),
 227                                &(base->hsync_len), &(base->vsync_len));
 228//bb_info_msg("TIM[%s]", p);
 229                        break;
 230                case 2:
 231                case 3: {
 232                        static const uint32_t syncs[] = {FB_VMODE_INTERLACED, FB_VMODE_DOUBLE};
 233                        ss(&base->vmode, syncs[i-2], p, "false");
 234//bb_info_msg("VMODE[%s]", p);
 235                        break;
 236                }
 237                case 4:
 238                case 5:
 239                case 6: {
 240                        static const uint32_t syncs[] = {FB_SYNC_VERT_HIGH_ACT, FB_SYNC_HOR_HIGH_ACT, FB_SYNC_COMP_HIGH_ACT};
 241                        ss(&base->sync, syncs[i-4], p, "low");
 242//bb_info_msg("SYNC[%s]", p);
 243                        break;
 244                }
 245                case 7:
 246                        ss(&base->sync, FB_SYNC_EXT, p, "false");
 247//bb_info_msg("EXTSYNC[%s]", p);
 248                        break;
 249                }
 250        }
 251        return 0;
 252}
 253#endif
 254
 255static void setmode(struct fb_var_screeninfo *base,
 256                                        struct fb_var_screeninfo *set)
 257{
 258        if ((int32_t) set->xres > 0)
 259                base->xres = set->xres;
 260        if ((int32_t) set->yres > 0)
 261                base->yres = set->yres;
 262        if ((int32_t) set->xres_virtual > 0)
 263                base->xres_virtual = set->xres_virtual;
 264        if ((int32_t) set->yres_virtual > 0)
 265                base->yres_virtual = set->yres_virtual;
 266        if ((int32_t) set->bits_per_pixel > 0)
 267                base->bits_per_pixel = set->bits_per_pixel;
 268}
 269
 270static void showmode(struct fb_var_screeninfo *v)
 271{
 272        double drate = 0, hrate = 0, vrate = 0;
 273
 274        if (v->pixclock) {
 275                drate = 1e12 / v->pixclock;
 276                hrate = drate / (v->left_margin + v->xres + v->right_margin + v->hsync_len);
 277                vrate = hrate / (v->upper_margin + v->yres + v->lower_margin + v->vsync_len);
 278        }
 279        printf("\nmode \"%ux%u-%u\"\n"
 280#if ENABLE_FEATURE_FBSET_FANCY
 281        "\t# D: %.3f MHz, H: %.3f kHz, V: %.3f Hz\n"
 282#endif
 283        "\tgeometry %u %u %u %u %u\n"
 284        "\ttimings %u %u %u %u %u %u %u\n"
 285        "\taccel %s\n"
 286        "\trgba %u/%u,%u/%u,%u/%u,%u/%u\n"
 287        "endmode\n\n",
 288                v->xres, v->yres, (int) (vrate + 0.5),
 289#if ENABLE_FEATURE_FBSET_FANCY
 290                drate / 1e6, hrate / 1e3, vrate,
 291#endif
 292                v->xres, v->yres, v->xres_virtual, v->yres_virtual, v->bits_per_pixel,
 293                v->pixclock, v->left_margin, v->right_margin, v->upper_margin, v->lower_margin,
 294                        v->hsync_len, v->vsync_len,
 295                (v->accel_flags > 0 ? "true" : "false"),
 296                v->red.length, v->red.offset, v->green.length, v->green.offset,
 297                        v->blue.length, v->blue.offset, v->transp.length, v->transp.offset);
 298}
 299
 300int fbset_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 301int fbset_main(int argc, char **argv)
 302{
 303        enum {
 304                OPT_CHANGE   = (1 << 0),
 305                /*OPT_INFO     = (1 << 1), ??*/
 306                OPT_READMODE = (1 << 2),
 307                OPT_ALL      = (1 << 9),
 308        };
 309        struct fb_var_screeninfo var, varset;
 310        int fh, i;
 311        unsigned options = 0;
 312
 313        const char *fbdev = DEFAULTFBDEV;
 314        const char *modefile = DEFAULTFBMODE;
 315        char *thisarg, *mode = NULL;
 316
 317        memset(&varset, 0xff, sizeof(varset));
 318
 319        /* parse cmd args.... why do they have to make things so difficult? */
 320        argv++;
 321        argc--;
 322        for (; argc > 0 && (thisarg = *argv) != NULL; argc--, argv++) {
 323                if (thisarg[0] == '-') for (i = 0; i < ARRAY_SIZE(g_cmdoptions); i++) {
 324                        if (strcmp(thisarg + 1, g_cmdoptions[i].name) != 0)
 325                                continue;
 326                        if (argc <= g_cmdoptions[i].param_count)
 327                                bb_show_usage();
 328
 329                        switch (g_cmdoptions[i].code) {
 330                        case CMD_FB:
 331                                fbdev = argv[1];
 332                                break;
 333                        case CMD_DB:
 334                                modefile = argv[1];
 335                                break;
 336                        case CMD_GEOMETRY:
 337                                varset.xres = xatou32(argv[1]);
 338                                varset.yres = xatou32(argv[2]);
 339                                varset.xres_virtual = xatou32(argv[3]);
 340                                varset.yres_virtual = xatou32(argv[4]);
 341                                varset.bits_per_pixel = xatou32(argv[5]);
 342                                break;
 343                        case CMD_TIMING:
 344                                varset.pixclock = xatou32(argv[1]);
 345                                varset.left_margin = xatou32(argv[2]);
 346                                varset.right_margin = xatou32(argv[3]);
 347                                varset.upper_margin = xatou32(argv[4]);
 348                                varset.lower_margin = xatou32(argv[5]);
 349                                varset.hsync_len = xatou32(argv[6]);
 350                                varset.vsync_len = xatou32(argv[7]);
 351                                break;
 352                        case CMD_ALL:
 353                                options |= OPT_ALL;
 354                                break;
 355                        case CMD_CHANGE:
 356                                options |= OPT_CHANGE;
 357                                break;
 358#if ENABLE_FEATURE_FBSET_FANCY
 359                        case CMD_XRES:
 360                                varset.xres = xatou32(argv[1]);
 361                                break;
 362                        case CMD_YRES:
 363                                varset.yres = xatou32(argv[1]);
 364                                break;
 365                        case CMD_DEPTH:
 366                                varset.bits_per_pixel = xatou32(argv[1]);
 367                                break;
 368#endif
 369                        }
 370                        argc -= g_cmdoptions[i].param_count;
 371                        argv += g_cmdoptions[i].param_count;
 372                        goto contin;
 373                }
 374                if (argc != 1)
 375                        bb_show_usage();
 376                mode = *argv;
 377                options |= OPT_READMODE;
 378 contin: ;
 379        }
 380
 381        fh = xopen(fbdev, O_RDONLY);
 382        xioctl(fh, FBIOGET_VSCREENINFO, &var);
 383        if (options & OPT_READMODE) {
 384#if !ENABLE_FEATURE_FBSET_READMODE
 385                bb_show_usage();
 386#else
 387                if (!readmode(&var, modefile, mode)) {
 388                        bb_error_msg_and_die("unknown video mode '%s'", mode);
 389                }
 390#endif
 391        }
 392
 393        setmode(&var, &varset);
 394        if (options & OPT_CHANGE) {
 395                if (options & OPT_ALL)
 396                        var.activate = FB_ACTIVATE_ALL;
 397                xioctl(fh, FBIOPUT_VSCREENINFO, &var);
 398        }
 399        showmode(&var);
 400        /* Don't close the file, as exiting will take care of that */
 401        /* close(fh); */
 402
 403        return EXIT_SUCCESS;
 404}
 405