drivers/char/fbmem.c

   1 /*
   2  *  linux/drivers/char/fbmem.c
   3  *
   4  *  Copyright (C) 1994 Martin Schaller
   5  *
   6  * This file is subject to the terms and conditions of the GNU General Public
   7  * License.  See the file COPYING in the main directory of this archive
   8  * for more details.
   9  */
  10
  11 #include <linux/config.h>
  12 #include <linux/module.h>
  13
  14 #include <linux/types.h>
  15 #include <linux/errno.h>
  16 #include <linux/sched.h>
  17 #include <linux/kernel.h>
  18 #include <linux/major.h>
  19 #include <linux/malloc.h>
  20 #include <linux/mman.h>
  21 #include <linux/tty.h>
  22 #include <linux/console.h>
  23 #include <linux/console_struct.h>
  24 #include <linux/init.h>
  25 #ifdef CONFIG_PROC_FS
  26 #include <linux/proc_fs.h>
  27 #endif
  28 #ifdef CONFIG_KMOD
  29 #include <linux/kmod.h>
  30 #endif
  31
  32 #ifdef __mc68000__
  33 #include <asm/setup.h>
  34 #endif
  35 #ifdef __powerpc__
  36 #include <asm/io.h>
  37 #endif
  38 #include <asm/uaccess.h>
  39 #include <asm/page.h>
  40 #include <asm/pgtable.h>
  41
  42 #include <linux/fb.h>
  43
  44
  45     /*
  46      *  Frame buffer device initialization and setup routines
  47      */
  48
  49 extern unsigned long acornfb_init(void);
  50 extern void acornfb_setup(char *options, int *ints);
  51 extern void amifb_init(void);
  52 extern void amifb_setup(char *options, int *ints);
  53 extern void atafb_init(void);
  54 extern void atafb_setup(char *options, int *ints);
  55 extern void macfb_init(void);
  56 extern void macfb_setup(char *options, int *ints);
  57 extern void cyberfb_init(void);
  58 extern void cyberfb_setup(char *options, int *ints);
  59 extern void retz3fb_init(void);
  60 extern void retz3fb_setup(char *options, int *ints);
  61 extern void clgenfb_init(void);
  62 extern void clgenfb_setup(char *options, int *ints);
  63 extern void vfb_init(void);
  64 extern void vfb_setup(char *options, int *ints);
  65 extern void offb_init(void);
  66 extern void offb_setup(char *options, int *ints);
  67 extern void atyfb_init(void);
  68 extern void atyfb_setup(char *options, int *ints);
  69 extern void dnfb_init(void);
  70 extern void tgafb_init(void);
  71 extern void virgefb_init(void);
  72 extern void virgefb_setup(char *options, int *ints);
  73 extern void resolver_video_setup(char *options, int *ints);
  74 extern void s3triofb_init(void);
  75 extern void s3triofb_setup(char *options, int *ints);
  76 extern void vgafb_init(void);
  77 extern void vgafb_setup(char *options, int *ints);
  78 extern void vesafb_init(void);
  79 extern void vesafb_setup(char *options, int *ints);
  80 extern void mdafb_init(void);
  81 extern void mdafb_setup(char *options, int *ints);
  82 extern void hpfb_init(void);
  83 extern void hpfb_setup(char *options, int *ints);
  84 extern void sbusfb_init(void);
  85 extern void sbusfb_setup(char *options, int *ints);
  86
  87 static struct {
  88         const char *name;
  89         void (*init)(void);
  90         void (*setup)(char *options, int *ints);
  91 } fb_drivers[] __initdata = {
  92 #ifdef CONFIG_FB_RETINAZ3
  93         { "retz3", retz3fb_init, retz3fb_setup },
  94 #endif
  95 #ifdef CONFIG_FB_ACORN
  96         { "acorn", acornfb_init, acornfb_setup },
  97 #endif
  98 #ifdef CONFIG_FB_AMIGA
  99         { "amifb", amifb_init, amifb_setup },
 100 #endif
 101 #ifdef CONFIG_FB_ATARI
 102         { "atafb", atafb_init, atafb_setup },
 103 #endif
 104 #ifdef CONFIG_FB_MAC
 105         { "macfb", macfb_init, macfb_setup },
 106 #endif
 107 #ifdef CONFIG_FB_CYBER
 108         { "cyber", cyberfb_init, cyberfb_setup },
 109 #endif
 110 #ifdef CONFIG_FB_CLGEN
 111         { "clgen", clgenfb_init, clgenfb_setup },
 112 #endif
 113 #ifdef CONFIG_FB_OF
 114         { "offb", offb_init, offb_setup },
 115 #endif
 116 #ifdef CONFIG_FB_ATY
 117         { "atyfb", atyfb_init, atyfb_setup },
 118 #endif
 119 #ifdef CONFIG_APOLLO
 120         { "apollo", dnfb_init, NULL },
 121 #endif
 122 #ifdef CONFIG_FB_S3TRIO
 123         { "s3trio", s3triofb_init, s3triofb_setup },
 124 #endif
 125 #ifdef CONFIG_FB_TGA
 126         { "tga", tgafb_init, NULL },
 127 #endif
 128 #ifdef CONFIG_FB_VIRGE
 129         { "virge", virgefb_init, virgefb_setup },
 130 #endif
 131 #ifdef CONFIG_FB_VGA
 132         { "vga", vgafb_init, vgafb_setup },
 133 #endif
 134 #ifdef CONFIG_FB_VESA
 135         { "vesa", vesafb_init, vesafb_setup },
 136 #endif
 137 #ifdef CONFIG_FB_MDA
 138         { "mda", mdafb_init, mdafb_setup },
 139 #endif
 140 #ifdef CONFIG_FB_HP300
 141         { "hpfb", hpfb_init, hpfb_setup },
 142 #endif
 143 #ifdef CONFIG_FB_SBUS
 144         { "sbus", sbusfb_init, sbusfb_setup },
 145 #endif
 146 #ifdef CONFIG_GSP_RESOLVER
 147         /* Not a real frame buffer device... */
 148         { "resolver", NULL, resolver_video_setup },
 149 #endif
 150 #ifdef CONFIG_FB_VIRTUAL
 151         /* Must be last to avoid that vfb becomes your primary display */
 152         { "vfb", vfb_init, vfb_setup },
 153 #endif
 154 };
 155
 156 #define NUM_FB_DRIVERS  (sizeof(fb_drivers)/sizeof(*fb_drivers))
 157
 158 static void (*pref_init_funcs[FB_MAX])(void);
 159 static int num_pref_init_funcs __initdata = 0;
 160
 161
 162 #define GET_INODE(i) MKDEV(FB_MAJOR, (i) << FB_MODES_SHIFT)
 163 #define GET_FB_VAR_IDX(node) (MINOR(node) & ((1 << FB_MODES_SHIFT)-1))
 164
 165 struct fb_info *registered_fb[FB_MAX];
 166 int num_registered_fb = 0;
 167
 168 char con2fb_map[MAX_NR_CONSOLES];
 169
 170 static inline int PROC_CONSOLE(void)
 171 {
 172         if (!current->tty)
 173                 return fg_console;
 174
 175         if (current->tty->driver.type != TTY_DRIVER_TYPE_CONSOLE)
 176                 /* XXX Should report error here? */
 177                 return fg_console;
 178
 179         if (MINOR(current->tty->device) < 1)
 180                 return fg_console;
 181
 182         return MINOR(current->tty->device) - 1;
 183 }
 184
 185 #ifdef CONFIG_PROC_FS
 186 static int fbmem_read_proc(char *buf, char **start, off_t offset,
 187                            int len, int *eof, void *private)
 188 {
 189         struct fb_info **fi;
 190
 191         len = 0;
 192         for (fi = registered_fb; fi < &registered_fb[FB_MAX] && len < 4000; fi++)
 193                 if (*fi)
 194                         len += sprintf(buf + len, "%d %s\n",
 195                                        GET_FB_IDX((*fi)->node),
 196                                        (*fi)->modename);
 197         *start = buf + offset;
 198         return len > offset ? len - offset : 0;
 199 }
 200 #endif
 201
 202 static ssize_t
 203 fb_read(struct file *file, char *buf, size_t count, loff_t *ppos)
 204 {
 205         unsigned long p = *ppos;
 206         struct inode *inode = file->f_dentry->d_inode;
 207         int fbidx = GET_FB_IDX(inode->i_rdev);
 208         struct fb_info *info = registered_fb[fbidx];
 209         struct fb_ops *fb = info->fbops;
 210         struct fb_fix_screeninfo fix;
 211         char *base_addr;
 212         ssize_t copy_size;
 213
 214         if (! fb || ! info->disp)
 215                 return -ENODEV;
 216
 217         fb->fb_get_fix(&fix,PROC_CONSOLE(), info);
 218         base_addr=info->disp->screen_base;
 219         copy_size=(count + p <= fix.smem_len ? count : fix.smem_len - p);
 220         if (copy_to_user(buf, base_addr+p, copy_size))
 221             return -EFAULT;
 222         *ppos += copy_size;
 223         return copy_size;
 224 }
 225
 226 static ssize_t
 227 fb_write(struct file *file, const char *buf, size_t count, loff_t *ppos)
 228 {
 229         unsigned long p = *ppos;
 230         struct inode *inode = file->f_dentry->d_inode;
 231         int fbidx = GET_FB_IDX(inode->i_rdev);
 232         struct fb_info *info = registered_fb[fbidx];
 233         struct fb_ops *fb = info->fbops;
 234         struct fb_fix_screeninfo fix;
 235         char *base_addr;
 236         ssize_t copy_size;
 237
 238         if (! fb || ! info->disp)
 239                 return -ENODEV;
 240
 241         fb->fb_get_fix(&fix, PROC_CONSOLE(), info);
 242         base_addr=info->disp->screen_base;
 243         copy_size=(count + p <= fix.smem_len ? count : fix.smem_len - p);
 244         if (copy_from_user(base_addr+p, buf, copy_size))
 245             return -EFAULT;
 246         file->f_pos += copy_size;
 247         return copy_size;
 248 }
 249
 250
 251 static void set_con2fb_map(int unit, int newidx)
 252 {
 253     int oldidx = con2fb_map[unit];
 254     struct fb_info *oldfb, *newfb;
 255     struct vc_data *conp;
 256
 257     if (newidx != con2fb_map[unit]) {
 258        oldfb = registered_fb[oldidx];
 259        newfb = registered_fb[newidx];
 260        if (newfb->fbops->fb_open(newfb,0))
 261            return;
 262        oldfb->fbops->fb_release(oldfb,0);
 263        conp = fb_display[unit].conp;
 264        con2fb_map[unit] = newidx;
 265        fb_display[unit] = *(newfb->disp);
 266        fb_display[unit].conp = conp;
 267        fb_display[unit].fb_info = newfb;
 268        if (!newfb->changevar)
 269            newfb->changevar = oldfb->changevar;
 270        /* tell console var has changed */
 271        if (newfb->changevar)
 272            newfb->changevar(unit);
 273     }
 274 }
 275
 276 #ifdef CONFIG_KMOD
 277 static void try_to_load(int fb)
 278 {
 279         char modname[16];
 280
 281         sprintf(modname, "fb%d", fb);
 282         request_module(modname);
 283 }
 284 #endif /* CONFIG_KMOD */
 285
 286 static int
 287 fb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
 288          unsigned long arg)
 289 {
 290         int fbidx = GET_FB_IDX(inode->i_rdev);
 291         struct fb_info *info = registered_fb[fbidx];
 292         struct fb_ops *fb = info->fbops;
 293         struct fb_cmap cmap;
 294         struct fb_var_screeninfo var;
 295         struct fb_fix_screeninfo fix;
 296         struct fb_con2fbmap con2fb;
 297         int i;
 298
 299         if (! fb)
 300                 return -ENODEV;
 301         switch (cmd) {
 302         case FBIOGET_VSCREENINFO:
 303                 if ((i = fb->fb_get_var(&var, PROC_CONSOLE(), info)))
 304                         return i;
 305                 return copy_to_user((void *) arg, &var,
 306                                     sizeof(var)) ? -EFAULT : 0;
 307         case FBIOPUT_VSCREENINFO:
 308                 if (copy_from_user(&var, (void *) arg, sizeof(var)))
 309                         return -EFAULT;
 310                 if ((i = fb->fb_set_var(&var, PROC_CONSOLE(), info)))
 311                         return i;
 312                 if (copy_to_user((void *) arg, &var, sizeof(var)))
 313                         return -EFAULT;
 314                 return 0;
 315         case FBIOGET_FSCREENINFO:
 316                 if ((i = fb->fb_get_fix(&fix, PROC_CONSOLE(), info)))
 317                         return i;
 318                 return copy_to_user((void *) arg, &fix, sizeof(fix)) ?
 319                         -EFAULT : 0;
 320         case FBIOPUTCMAP:
 321                 if (copy_from_user(&cmap, (void *) arg, sizeof(cmap)))
 322                         return -EFAULT;
 323                 return (fb->fb_set_cmap(&cmap, 0, PROC_CONSOLE(), info));
 324         case FBIOGETCMAP:
 325                 if (copy_from_user(&cmap, (void *) arg, sizeof(cmap)))
 326                         return -EFAULT;
 327                 return (fb->fb_get_cmap(&cmap, 0, PROC_CONSOLE(), info));
 328         case FBIOPAN_DISPLAY:
 329                 if (copy_from_user(&var, (void *) arg, sizeof(var)))
 330                         return -EFAULT;
 331                 if ((i=fb->fb_pan_display(&var, PROC_CONSOLE(), info)))
 332                         return i;
 333                 if (copy_to_user((void *) arg, &var, sizeof(var)))
 334                         return -EFAULT;
 335                 return i;
 336         case FBIOGET_CON2FBMAP:
 337                 if (copy_from_user(&con2fb, (void *)arg, sizeof(con2fb)))
 338                         return -EFAULT;
 339                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
 340                     return -EINVAL;
 341                 con2fb.framebuffer = con2fb_map[con2fb.console-1];
 342                 return copy_to_user((void *)arg, &con2fb,
 343                                     sizeof(con2fb)) ? -EFAULT : 0;
 344         case FBIOPUT_CON2FBMAP:
 345                 if (copy_from_user(&con2fb, (void *)arg, sizeof(con2fb)))
 346                         return - EFAULT;
 347                 if (con2fb.console < 0 || con2fb.console > MAX_NR_CONSOLES)
 348                     return -EINVAL;
 349                 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
 350                     return -EINVAL;
 351 #ifdef CONFIG_KMOD
 352                 if (!registered_fb[con2fb.framebuffer])
 353                     try_to_load(con2fb.framebuffer);
 354 #endif /* CONFIG_KMOD */
 355                 if (!registered_fb[con2fb.framebuffer])
 356                     return -EINVAL;
 357                 if (con2fb.console != 0)
 358                     set_con2fb_map(con2fb.console-1, con2fb.framebuffer);
 359                 else
 360                     /* set them all */
 361                     for (i = 0; i < MAX_NR_CONSOLES; i++)
 362                         set_con2fb_map(i, con2fb.framebuffer);
 363                 return 0;
 364         default:
 365                 return fb->fb_ioctl(inode, file, cmd, arg, PROC_CONSOLE(),
 366                                     info);
 367         }
 368 }
 369
 370 static int
 371 fb_mmap(struct file *file, struct vm_area_struct * vma)
 372 {
 373         int fbidx = GET_FB_IDX(file->f_dentry->d_inode->i_rdev);
 374         struct fb_info *info = registered_fb[fbidx];
 375         struct fb_ops *fb = info->fbops;
 376         struct fb_fix_screeninfo fix;
 377         struct fb_var_screeninfo var;
 378         unsigned long start;
 379         u32 len;
 380
 381         if (!fb)
 382                 return -ENODEV;
 383         if (fb->fb_mmap)
 384                 return fb->fb_mmap(info, file, vma);
 385         fb->fb_get_fix(&fix, PROC_CONSOLE(), info);
 386
 387         /* frame buffer memory */
 388         start = (unsigned long)fix.smem_start;
 389         len = (start & ~PAGE_MASK)+fix.smem_len;
 390         start &= PAGE_MASK;
 391         len = (len+~PAGE_MASK) & PAGE_MASK;
 392         if (vma->vm_offset >= len) {
 393                 /* memory mapped io */
 394                 vma->vm_offset -= len;
 395                 fb->fb_get_var(&var, PROC_CONSOLE(), info);
 396                 if (var.accel_flags)
 397                         return -EINVAL;
 398                 start = (unsigned long)fix.mmio_start;
 399                 len = (start & ~PAGE_MASK)+fix.mmio_len;
 400                 start &= PAGE_MASK;
 401                 len = (len+~PAGE_MASK) & PAGE_MASK;
 402         }
 403         if ((vma->vm_end - vma->vm_start + vma->vm_offset) > len)
 404                 return -EINVAL;
 405         vma->vm_offset += start;
 406         if (vma->vm_offset & ~PAGE_MASK)
 407                 return -ENXIO;
 408 #if defined(__mc68000__)
 409         if (CPU_IS_020_OR_030)
 410                 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE030;
 411         if (CPU_IS_040_OR_060) {
 412                 pgprot_val(vma->vm_page_prot) &= _CACHEMASK040;
 413                 /* Use no-cache mode, serialized */
 414                 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE_S;
 415         }
 416 #elif defined(__powerpc__)
 417         pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE|_PAGE_GUARDED;
 418 #elif defined(__alpha__)
 419         /* Caching is off in the I/O space quadrant by design.  */
 420 #elif defined(__sparc__)
 421         /* Should never get here, all fb drivers should have their own
 422            mmap routines */
 423 #elif defined(__i386__)
 424         if (boot_cpu_data.x86 > 3)
 425                 pgprot_val(vma->vm_page_prot) |= _PAGE_PCD;
 426 #else
 427 #warning What do we have to do here??
 428 #endif
 429         if (remap_page_range(vma->vm_start, vma->vm_offset,
 430                              vma->vm_end - vma->vm_start, vma->vm_page_prot))
 431                 return -EAGAIN;
 432         vma->vm_file = file;
 433         file->f_count++;
 434         return 0;
 435 }
 436
 437 static int
 438 fb_open(struct inode *inode, struct file *file)
 439 {
 440         int fbidx = GET_FB_IDX(inode->i_rdev);
 441         struct fb_info *info;
 442
 443 #ifdef CONFIG_KMOD
 444         if (!(info = registered_fb[fbidx]))
 445                 try_to_load(fbidx);
 446 #endif /* CONFIG_KMOD */
 447         if (!(info = registered_fb[fbidx]))
 448                 return -ENODEV;
 449         return info->fbops->fb_open(info,1);
 450 }
 451
 452 static int
 453 fb_release(struct inode *inode, struct file *file)
 454 {
 455         int fbidx = GET_FB_IDX(inode->i_rdev);
 456         struct fb_info *info = registered_fb[fbidx];
 457
 458         info->fbops->fb_release(info,1);
 459         return 0;
 460 }
 461
 462 static struct file_operations fb_fops = {
 463         NULL,           /* lseek        */
 464         fb_read,        /* read         */
 465         fb_write,       /* write        */
 466         NULL,           /* readdir      */
 467         NULL,           /* poll         */
 468         fb_ioctl,       /* ioctl        */
 469         fb_mmap,        /* mmap         */
 470         fb_open,        /* open         */
 471         NULL,           /* flush        */
 472         fb_release,     /* release      */
 473         NULL            /* fsync        */
 474 };
 475
 476 int
 477 register_framebuffer(struct fb_info *fb_info)
 478 {
 479         int i, j;
 480         static int fb_ever_opened[FB_MAX];
 481         static int first = 1;
 482
 483         if (num_registered_fb == FB_MAX)
 484                 return -ENXIO;
 485         num_registered_fb++;
 486         for (i = 0 ; i < FB_MAX; i++)
 487                 if (!registered_fb[i])
 488                         break;
 489         fb_info->node=GET_INODE(i);
 490         registered_fb[i] = fb_info;
 491         if (!fb_ever_opened[i]) {
 492                 /*
 493                  *  We assume initial frame buffer devices can be opened this
 494                  *  many times
 495                  */
 496                 for (j = 0; j < MAX_NR_CONSOLES; j++)
 497                         if (con2fb_map[j] == i)
 498                                 fb_info->fbops->fb_open(fb_info,0);
 499                 fb_ever_opened[i] = 1;
 500         }
 501
 502         if (first) {
 503                 first = 0;
 504                 take_over_console(&fb_con, 0, MAX_NR_CONSOLES-1, 1);
 505         }
 506
 507         return 0;
 508 }
 509
 510 int
 511 unregister_framebuffer(const struct fb_info *fb_info)
 512 {
 513         int i, j;
 514
 515         i = GET_FB_IDX(fb_info->node);
 516         for (j = 0; j < MAX_NR_CONSOLES; j++)
 517                 if (con2fb_map[j] == i)
 518                         return -EBUSY;
 519         if (!registered_fb[i])
 520                 return -EINVAL;
 521         registered_fb[i]=NULL;
 522         num_registered_fb--;
 523         return 0;
 524 }
 525
 526 #ifdef CONFIG_PROC_FS
 527 static struct proc_dir_entry *proc_fbmem;
 528 #endif
 529
 530 __initfunc(void
 531 fbmem_init(void))
 532 {
 533         int i;
 534
 535 #ifdef CONFIG_PROC_FS
 536         proc_fbmem = create_proc_entry("fb", 0, 0);
 537         if (proc_fbmem)
 538                 proc_fbmem->read_proc = fbmem_read_proc;
 539 #endif
 540
 541         if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
 542                 printk("unable to get major %d for fb devs\n", FB_MAJOR);
 543
 544         /*
 545          *  Probe for all builtin frame buffer devices
 546          */
 547         for (i = 0; i < num_pref_init_funcs; i++)
 548                 pref_init_funcs[i]();
 549
 550         for (i = 0; i < NUM_FB_DRIVERS; i++)
 551                 if (fb_drivers[i].init)
 552                         fb_drivers[i].init();
 553 }
 554
 555
 556 int fbmon_valid_timings(u_int pixclock, u_int htotal, u_int vtotal,
 557                         const struct fb_info *fb_info)
 558 {
 559 #if 0
 560         /*
 561          * long long divisions .... $#%%#$
 562          */
 563     unsigned long long hpicos, vpicos;
 564     const unsigned long long _1e12 = 1000000000000ULL;
 565     const struct fb_monspecs *monspecs = &fb_info->monspecs;
 566
 567     hpicos = (unsigned long long)htotal*(unsigned long long)pixclock;
 568     vpicos = (unsigned long long)vtotal*(unsigned long long)hpicos;
 569     if (!vpicos)
 570         return 0;
 571
 572     if (monspecs->hfmin == 0)
 573         return 1;
 574
 575     if (hpicos*monspecs->hfmin > _1e12 || hpicos*monspecs->hfmax < _1e12 ||
 576         vpicos*monspecs->vfmin > _1e12 || vpicos*monspecs->vfmax < _1e12)
 577         return 0;
 578 #endif
 579     return 1;
 580 }
 581
 582 int fbmon_dpms(const struct fb_info *fb_info)
 583 {
 584     return fb_info->monspecs.dpms;
 585 }
 586
 587
 588     /*
 589      *  Command line options
 590      */
 591
 592 __initfunc(void video_setup(char *options, int *ints))
 593 {
 594     int i, j;
 595
 596     if (!options || !*options)
 597             return;
 598
 599     if (!strncmp(options, "map:", 4)) {
 600             options += 4;
 601             if (*options)
 602                     for (i = 0, j = 0; i < MAX_NR_CONSOLES; i++) {
 603                             if (!options[j])
 604                                     j = 0;
 605                             con2fb_map[i] = (options[j++]-'0') % FB_MAX;
 606                     }
 607             return;
 608     }
 609
 610     if (num_pref_init_funcs == FB_MAX)
 611             return;
 612
 613     for (i = 0; i < NUM_FB_DRIVERS; i++) {
 614             j = strlen(fb_drivers[i].name);
 615             if (!strncmp(options, fb_drivers[i].name, j) &&
 616                 options[j] == ':') {
 617                     if (!strcmp(options+j+1, "off"))
 618                             fb_drivers[i].init = NULL;
 619                     else {
 620                             if (fb_drivers[i].init) {
 621                                     pref_init_funcs[num_pref_init_funcs++] =
 622                                             fb_drivers[i].init;
 623                                     fb_drivers[i].init = NULL;
 624                             }
 625                             if (fb_drivers[i].setup)
 626                                     fb_drivers[i].setup(options+j+1, ints);
 627                     }
 628                     return;
 629             }
 630     }
 631     /*
 632      * If we get here no fb was specified and we default to pass the
 633      * options to the first frame buffer that has an init and a setup
 634      * function.
 635      */
 636     for (i = 0; i < NUM_FB_DRIVERS; i++) {
 637             if (fb_drivers[i].init && fb_drivers[i].setup) {
 638                     pref_init_funcs[num_pref_init_funcs++] =
 639                             fb_drivers[i].init;
 640                     fb_drivers[i].init = NULL;
 641
 642                     fb_drivers[i].setup(options, ints);
 643                     return;
 644             }
 645     }
 646 }
 647
 648
 649     /*
 650      *  Visible symbols for modules
 651      */
 652
 653 EXPORT_SYMBOL(register_framebuffer);
 654 EXPORT_SYMBOL(unregister_framebuffer);