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   1 /*
   2  *  linux/drivers/video/fbmem.c
   3  *
   4  *  Copyright (C) 1994 Martin Schaller
   5  *
   6  *      2001 - Documented with DocBook
   7  *      - Brad Douglas <brad@neruo.com>
   8  *
   9  * This file is subject to the terms and conditions of the GNU General Public
  10  * License.  See the file COPYING in the main directory of this archive
  11  * for more details.
  12  */
  13
  14 #include <linux/config.h>
  15 #include <linux/module.h>
  16
  17 #include <linux/types.h>
  18 #include <linux/errno.h>
  19 #include <linux/sched.h>
  20 #include <linux/smp_lock.h>
  21 #include <linux/kernel.h>
  22 #include <linux/major.h>
  23 #include <linux/slab.h>
  24 #include <linux/mm.h>
  25 #include <linux/mman.h>
  26 #include <linux/tty.h>
  27 #include <linux/init.h>
  28 #include <linux/linux_logo.h>
  29 #include <linux/proc_fs.h>
  30 #include <linux/console.h>
  31 #ifdef CONFIG_KMOD
  32 #include <linux/kmod.h>
  33 #endif
  34 #include <linux/devfs_fs_kernel.h>
  35 #include <linux/err.h>
  36 #include <linux/kernel.h>
  37 #include <linux/device.h>
  38 #include <linux/efi.h>
  39
  40 #if defined(__mc68000__) || defined(CONFIG_APUS)
  41 #include <asm/setup.h>
  42 #endif
  43
  44 #include <asm/io.h>
  45 #include <asm/uaccess.h>
  46 #include <asm/page.h>
  47 #include <asm/pgtable.h>
  48
  49 #include <linux/fb.h>
  50
  51     /*
  52      *  Frame buffer device initialization and setup routines
  53      */
  54
  55 #define FBPIXMAPSIZE    (1024 * 8)
  56
  57 static struct notifier_block *fb_notifier_list;
  58 struct fb_info *registered_fb[FB_MAX];
  59 int num_registered_fb;
  60
  61 /*
  62  * Helpers
  63  */
  64
  65 int fb_get_color_depth(struct fb_var_screeninfo *var)
  66 {
  67         if (var->green.length == var->blue.length &&
  68             var->green.length == var->red.length &&
  69             !var->green.offset && !var->blue.offset &&
  70             !var->red.offset)
  71                 return var->green.length;
  72         else
  73                 return (var->green.length + var->red.length +
  74                         var->blue.length);
  75 }
  76 EXPORT_SYMBOL(fb_get_color_depth);
  77
  78 /*
  79  * Drawing helpers.
  80  */
  81 void fb_iomove_buf_aligned(struct fb_info *info, struct fb_pixmap *buf,
  82                            u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch,
  83                            u32 height)
  84 {
  85         int i;
  86
  87         for (i = height; i--; ) {
  88                 buf->outbuf(info, dst, src, s_pitch);
  89                 src += s_pitch;
  90                 dst += d_pitch;
  91         }
  92 }
  93
  94 void fb_sysmove_buf_aligned(struct fb_info *info, struct fb_pixmap *buf,
  95                             u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch,
  96                             u32 height)
  97 {
  98         int i, j;
  99
 100         for (i = height; i--; ) {
 101                 for (j = 0; j < s_pitch; j++)
 102                         dst[j] = src[j];
 103                 src += s_pitch;
 104                 dst += d_pitch;
 105         }
 106 }
 107
 108 void fb_iomove_buf_unaligned(struct fb_info *info, struct fb_pixmap *buf,
 109                              u8 *dst, u32 d_pitch, u8 *src, u32 idx,
 110                              u32 height, u32 shift_high, u32 shift_low,
 111                              u32 mod)
 112 {
 113         u8 mask = (u8) (0xfff << shift_high), tmp;
 114         int i, j;
 115
 116         for (i = height; i--; ) {
 117                 for (j = 0; j < idx; j++) {
 118                         tmp = buf->inbuf(info, dst+j);
 119                         tmp &= mask;
 120                         tmp |= *src >> shift_low;
 121                         buf->outbuf(info, dst+j, &tmp, 1);
 122                         tmp = *src << shift_high;
 123                         buf->outbuf(info, dst+j+1, &tmp, 1);
 124                         src++;
 125                 }
 126                 tmp = buf->inbuf(info, dst+idx);
 127                 tmp &= mask;
 128                 tmp |= *src >> shift_low;
 129                 buf->outbuf(info, dst+idx, &tmp, 1);
 130                 if (shift_high < mod) {
 131                         tmp = *src << shift_high;
 132                         buf->outbuf(info, dst+idx+1, &tmp, 1);
 133                 }
 134                 src++;
 135                 dst += d_pitch;
 136         }
 137 }
 138
 139 void fb_sysmove_buf_unaligned(struct fb_info *info, struct fb_pixmap *buf,
 140                               u8 *dst, u32 d_pitch, u8 *src, u32 idx,
 141                               u32 height, u32 shift_high, u32 shift_low,
 142                               u32 mod)
 143 {
 144         u8 mask = (u8) (0xfff << shift_high), tmp;
 145         int i, j;
 146
 147         for (i = height; i--; ) {
 148                 for (j = 0; j < idx; j++) {
 149                         tmp = dst[j];
 150                         tmp &= mask;
 151                         tmp |= *src >> shift_low;
 152                         dst[j] = tmp;
 153                         tmp = *src << shift_high;
 154                         dst[j+1] = tmp;
 155                         src++;
 156                 }
 157                 tmp = dst[idx];
 158                 tmp &= mask;
 159                 tmp |= *src >> shift_low;
 160                 dst[idx] = tmp;
 161                 if (shift_high < mod) {
 162                         tmp = *src << shift_high;
 163                         dst[idx+1] = tmp;
 164                 }
 165                 src++;
 166                 dst += d_pitch;
 167         }
 168 }
 169
 170 /*
 171  * we need to lock this section since fb_cursor
 172  * may use fb_imageblit()
 173  */
 174 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
 175 {
 176         u32 align = buf->buf_align - 1, offset;
 177         char *addr = buf->addr;
 178
 179         /* If IO mapped, we need to sync before access, no sharing of
 180          * the pixmap is done
 181          */
 182         if (buf->flags & FB_PIXMAP_IO) {
 183                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 184                         info->fbops->fb_sync(info);
 185                 return addr;
 186         }
 187
 188         /* See if we fit in the remaining pixmap space */
 189         offset = buf->offset + align;
 190         offset &= ~align;
 191         if (offset + size > buf->size) {
 192                 /* We do not fit. In order to be able to re-use the buffer,
 193                  * we must ensure no asynchronous DMA'ing or whatever operation
 194                  * is in progress, we sync for that.
 195                  */
 196                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 197                         info->fbops->fb_sync(info);
 198                 offset = 0;
 199         }
 200         buf->offset = offset + size;
 201         addr += offset;
 202
 203         return addr;
 204 }
 205
 206 #ifdef CONFIG_LOGO
 207 #include <linux/linux_logo.h>
 208
 209 static inline unsigned safe_shift(unsigned d, int n)
 210 {
 211         return n < 0 ? d >> -n : d << n;
 212 }
 213
 214 static void fb_set_logocmap(struct fb_info *info,
 215                                    const struct linux_logo *logo)
 216 {
 217         struct fb_cmap palette_cmap;
 218         u16 palette_green[16];
 219         u16 palette_blue[16];
 220         u16 palette_red[16];
 221         int i, j, n;
 222         const unsigned char *clut = logo->clut;
 223
 224         palette_cmap.start = 0;
 225         palette_cmap.len = 16;
 226         palette_cmap.red = palette_red;
 227         palette_cmap.green = palette_green;
 228         palette_cmap.blue = palette_blue;
 229         palette_cmap.transp = NULL;
 230
 231         for (i = 0; i < logo->clutsize; i += n) {
 232                 n = logo->clutsize - i;
 233                 /* palette_cmap provides space for only 16 colors at once */
 234                 if (n > 16)
 235                         n = 16;
 236                 palette_cmap.start = 32 + i;
 237                 palette_cmap.len = n;
 238                 for (j = 0; j < n; ++j) {
 239                         palette_cmap.red[j] = clut[0] << 8 | clut[0];
 240                         palette_cmap.green[j] = clut[1] << 8 | clut[1];
 241                         palette_cmap.blue[j] = clut[2] << 8 | clut[2];
 242                         clut += 3;
 243                 }
 244                 fb_set_cmap(&palette_cmap, info);
 245         }
 246 }
 247
 248 static void  fb_set_logo_truepalette(struct fb_info *info,
 249                                             const struct linux_logo *logo,
 250                                             u32 *palette)
 251 {
 252         unsigned char mask[9] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
 253         unsigned char redmask, greenmask, bluemask;
 254         int redshift, greenshift, blueshift;
 255         int i;
 256         const unsigned char *clut = logo->clut;
 257
 258         /*
 259          * We have to create a temporary palette since console palette is only
 260          * 16 colors long.
 261          */
 262         /* Bug: Doesn't obey msb_right ... (who needs that?) */
 263         redmask   = mask[info->var.red.length   < 8 ? info->var.red.length   : 8];
 264         greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
 265         bluemask  = mask[info->var.blue.length  < 8 ? info->var.blue.length  : 8];
 266         redshift   = info->var.red.offset   - (8 - info->var.red.length);
 267         greenshift = info->var.green.offset - (8 - info->var.green.length);
 268         blueshift  = info->var.blue.offset  - (8 - info->var.blue.length);
 269
 270         for ( i = 0; i < logo->clutsize; i++) {
 271                 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
 272                                  safe_shift((clut[1] & greenmask), greenshift) |
 273                                  safe_shift((clut[2] & bluemask), blueshift));
 274                 clut += 3;
 275         }
 276 }
 277
 278 static void fb_set_logo_directpalette(struct fb_info *info,
 279                                              const struct linux_logo *logo,
 280                                              u32 *palette)
 281 {
 282         int redshift, greenshift, blueshift;
 283         int i;
 284
 285         redshift = info->var.red.offset;
 286         greenshift = info->var.green.offset;
 287         blueshift = info->var.blue.offset;
 288
 289         for (i = 32; i < logo->clutsize; i++)
 290                 palette[i] = i << redshift | i << greenshift | i << blueshift;
 291 }
 292
 293 static void fb_set_logo(struct fb_info *info,
 294                                const struct linux_logo *logo, u8 *dst,
 295                                int depth)
 296 {
 297         int i, j, k, fg = 1;
 298         const u8 *src = logo->data;
 299         u8 d, xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
 300
 301         if (fb_get_color_depth(&info->var) == 3)
 302                 fg = 7;
 303
 304         switch (depth) {
 305         case 4:
 306                 for (i = 0; i < logo->height; i++)
 307                         for (j = 0; j < logo->width; src++) {
 308                                 *dst++ = *src >> 4;
 309                                 j++;
 310                                 if (j < logo->width) {
 311                                         *dst++ = *src & 0x0f;
 312                                         j++;
 313                                 }
 314                         }
 315                 break;
 316         case 1:
 317                 for (i = 0; i < logo->height; i++) {
 318                         for (j = 0; j < logo->width; src++) {
 319                                 d = *src ^ xor;
 320                                 for (k = 7; k >= 0; k--) {
 321                                         *dst++ = ((d >> k) & 1) ? fg : 0;
 322                                         j++;
 323                                 }
 324                         }
 325                 }
 326                 break;
 327         }
 328 }
 329
 330 /*
 331  * Three (3) kinds of logo maps exist.  linux_logo_clut224 (>16 colors),
 332  * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors).  Depending on
 333  * the visual format and color depth of the framebuffer, the DAC, the
 334  * pseudo_palette, and the logo data will be adjusted accordingly.
 335  *
 336  * Case 1 - linux_logo_clut224:
 337  * Color exceeds the number of console colors (16), thus we set the hardware DAC
 338  * using fb_set_cmap() appropriately.  The "needs_cmapreset"  flag will be set.
 339  *
 340  * For visuals that require color info from the pseudo_palette, we also construct
 341  * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
 342  * will be set.
 343  *
 344  * Case 2 - linux_logo_vga16:
 345  * The number of colors just matches the console colors, thus there is no need
 346  * to set the DAC or the pseudo_palette.  However, the bitmap is packed, ie,
 347  * each byte contains color information for two pixels (upper and lower nibble).
 348  * To be consistent with fb_imageblit() usage, we therefore separate the two
 349  * nibbles into separate bytes. The "depth" flag will be set to 4.
 350  *
 351  * Case 3 - linux_logo_mono:
 352  * This is similar with Case 2.  Each byte contains information for 8 pixels.
 353  * We isolate each bit and expand each into a byte. The "depth" flag will
 354  * be set to 1.
 355  */
 356 static struct logo_data {
 357         int depth;
 358         int needs_directpalette;
 359         int needs_truepalette;
 360         int needs_cmapreset;
 361         const struct linux_logo *logo;
 362 } fb_logo;
 363
 364 int fb_prepare_logo(struct fb_info *info)
 365 {
 366         int depth = fb_get_color_depth(&info->var);
 367
 368         memset(&fb_logo, 0, sizeof(struct logo_data));
 369
 370         if (info->flags & FBINFO_MISC_TILEBLITTING)
 371                 return 0;
 372
 373         if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
 374                 depth = info->var.blue.length;
 375                 if (info->var.red.length < depth)
 376                         depth = info->var.red.length;
 377                 if (info->var.green.length < depth)
 378                         depth = info->var.green.length;
 379         }
 380
 381         if (depth >= 8) {
 382                 switch (info->fix.visual) {
 383                 case FB_VISUAL_TRUECOLOR:
 384                         fb_logo.needs_truepalette = 1;
 385                         break;
 386                 case FB_VISUAL_DIRECTCOLOR:
 387                         fb_logo.needs_directpalette = 1;
 388                         fb_logo.needs_cmapreset = 1;
 389                         break;
 390                 case FB_VISUAL_PSEUDOCOLOR:
 391                         fb_logo.needs_cmapreset = 1;
 392                         break;
 393                 }
 394         }
 395
 396         /* Return if no suitable logo was found */
 397         fb_logo.logo = fb_find_logo(depth);
 398
 399         if (!fb_logo.logo || fb_logo.logo->height > info->var.yres) {
 400                 fb_logo.logo = NULL;
 401                 return 0;
 402         }
 403         /* What depth we asked for might be different from what we get */
 404         if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
 405                 fb_logo.depth = 8;
 406         else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
 407                 fb_logo.depth = 4;
 408         else
 409                 fb_logo.depth = 1;
 410         return fb_logo.logo->height;
 411 }
 412
 413 int fb_show_logo(struct fb_info *info)
 414 {
 415         u32 *palette = NULL, *saved_pseudo_palette = NULL;
 416         unsigned char *logo_new = NULL;
 417         struct fb_image image;
 418         int x;
 419
 420         /* Return if the frame buffer is not mapped or suspended */
 421         if (fb_logo.logo == NULL || info->state != FBINFO_STATE_RUNNING)
 422                 return 0;
 423
 424         image.depth = 8;
 425         image.data = fb_logo.logo->data;
 426
 427         if (fb_logo.needs_cmapreset)
 428                 fb_set_logocmap(info, fb_logo.logo);
 429
 430         if (fb_logo.needs_truepalette ||
 431             fb_logo.needs_directpalette) {
 432                 palette = kmalloc(256 * 4, GFP_KERNEL);
 433                 if (palette == NULL)
 434                         return 0;
 435
 436                 if (fb_logo.needs_truepalette)
 437                         fb_set_logo_truepalette(info, fb_logo.logo, palette);
 438                 else
 439                         fb_set_logo_directpalette(info, fb_logo.logo, palette);
 440
 441                 saved_pseudo_palette = info->pseudo_palette;
 442                 info->pseudo_palette = palette;
 443         }
 444
 445         if (fb_logo.depth <= 4) {
 446                 logo_new = kmalloc(fb_logo.logo->width * fb_logo.logo->height,
 447                                    GFP_KERNEL);
 448                 if (logo_new == NULL) {
 449                         kfree(palette);
 450                         if (saved_pseudo_palette)
 451                                 info->pseudo_palette = saved_pseudo_palette;
 452                         return 0;
 453                 }
 454                 image.data = logo_new;
 455                 fb_set_logo(info, fb_logo.logo, logo_new, fb_logo.depth);
 456         }
 457
 458         image.width = fb_logo.logo->width;
 459         image.height = fb_logo.logo->height;
 460         image.dy = 0;
 461
 462         for (x = 0; x < num_online_cpus() * (fb_logo.logo->width + 8) &&
 463              x <= info->var.xres-fb_logo.logo->width; x += (fb_logo.logo->width + 8)) {
 464                 image.dx = x;
 465                 info->fbops->fb_imageblit(info, &image);
 466         }
 467
 468         kfree(palette);
 469         if (saved_pseudo_palette != NULL)
 470                 info->pseudo_palette = saved_pseudo_palette;
 471         kfree(logo_new);
 472         return fb_logo.logo->height;
 473 }
 474 #else
 475 int fb_prepare_logo(struct fb_info *info) { return 0; }
 476 int fb_show_logo(struct fb_info *info) { return 0; }
 477 #endif /* CONFIG_LOGO */
 478
 479 static int fbmem_read_proc(char *buf, char **start, off_t offset,
 480                            int len, int *eof, void *private)
 481 {
 482         struct fb_info **fi;
 483         int clen;
 484
 485         clen = 0;
 486         for (fi = registered_fb; fi < &registered_fb[FB_MAX] && len < 4000; fi++)
 487                 if (*fi)
 488                         clen += sprintf(buf + clen, "%d %s\n",
 489                                         (*fi)->node,
 490                                         (*fi)->fix.id);
 491         *start = buf + offset;
 492         if (clen > offset)
 493                 clen -= offset;
 494         else
 495                 clen = 0;
 496         return clen < len ? clen : len;
 497 }
 498
 499 static ssize_t
 500 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 501 {
 502         unsigned long p = *ppos;
 503         struct inode *inode = file->f_dentry->d_inode;
 504         int fbidx = iminor(inode);
 505         struct fb_info *info = registered_fb[fbidx];
 506         u32 *buffer, *dst;
 507         u32 __iomem *src;
 508         int c, i, cnt = 0, err = 0;
 509         unsigned long total_size;
 510
 511         if (!info || ! info->screen_base)
 512                 return -ENODEV;
 513
 514         if (info->state != FBINFO_STATE_RUNNING)
 515                 return -EPERM;
 516
 517         if (info->fbops->fb_read)
 518                 return info->fbops->fb_read(file, buf, count, ppos);
 519
 520         total_size = info->screen_size;
 521         if (total_size == 0)
 522                 total_size = info->fix.smem_len;
 523
 524         if (p >= total_size)
 525             return 0;
 526         if (count >= total_size)
 527             count = total_size;
 528         if (count + p > total_size)
 529                 count = total_size - p;
 530
 531         cnt = 0;
 532         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 533                          GFP_KERNEL);
 534         if (!buffer)
 535                 return -ENOMEM;
 536
 537         src = (u32 __iomem *) (info->screen_base + p);
 538
 539         if (info->fbops->fb_sync)
 540                 info->fbops->fb_sync(info);
 541
 542         while (count) {
 543                 c  = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 544                 dst = buffer;
 545                 for (i = c >> 2; i--; )
 546                         *dst++ = fb_readl(src++);
 547                 if (c & 3) {
 548                         u8 *dst8 = (u8 *) dst;
 549                         u8 __iomem *src8 = (u8 __iomem *) src;
 550
 551                         for (i = c & 3; i--;)
 552                                 *dst8++ = fb_readb(src8++);
 553
 554                         src = (u32 __iomem *) src8;
 555                 }
 556
 557                 if (copy_to_user(buf, buffer, c)) {
 558                         err = -EFAULT;
 559                         break;
 560                 }
 561                 *ppos += c;
 562                 buf += c;
 563                 cnt += c;
 564                 count -= c;
 565         }
 566
 567         kfree(buffer);
 568         return (err) ? err : cnt;
 569 }
 570
 571 static ssize_t
 572 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 573 {
 574         unsigned long p = *ppos;
 575         struct inode *inode = file->f_dentry->d_inode;
 576         int fbidx = iminor(inode);
 577         struct fb_info *info = registered_fb[fbidx];
 578         u32 *buffer, *src;
 579         u32 __iomem *dst;
 580         int c, i, cnt = 0, err;
 581         unsigned long total_size;
 582
 583         if (!info || !info->screen_base)
 584                 return -ENODEV;
 585
 586         if (info->state != FBINFO_STATE_RUNNING)
 587                 return -EPERM;
 588
 589         if (info->fbops->fb_write)
 590                 return info->fbops->fb_write(file, buf, count, ppos);
 591
 592         total_size = info->screen_size;
 593         if (total_size == 0)
 594                 total_size = info->fix.smem_len;
 595
 596         if (p > total_size)
 597             return -ENOSPC;
 598         if (count >= total_size)
 599             count = total_size;
 600         err = 0;
 601         if (count + p > total_size) {
 602             count = total_size - p;
 603             err = -ENOSPC;
 604         }
 605         cnt = 0;
 606         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 607                          GFP_KERNEL);
 608         if (!buffer)
 609                 return -ENOMEM;
 610
 611         dst = (u32 __iomem *) (info->screen_base + p);
 612
 613         if (info->fbops->fb_sync)
 614                 info->fbops->fb_sync(info);
 615
 616         while (count) {
 617                 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 618                 src = buffer;
 619                 if (copy_from_user(src, buf, c)) {
 620                         err = -EFAULT;
 621                         break;
 622                 }
 623                 for (i = c >> 2; i--; )
 624                         fb_writel(*src++, dst++);
 625                 if (c & 3) {
 626                         u8 *src8 = (u8 *) src;
 627                         u8 __iomem *dst8 = (u8 __iomem *) dst;
 628
 629                         for (i = c & 3; i--; )
 630                                 fb_writeb(*src8++, dst8++);
 631
 632                         dst = (u32 __iomem *) dst8;
 633                 }
 634                 *ppos += c;
 635                 buf += c;
 636                 cnt += c;
 637                 count -= c;
 638         }
 639         kfree(buffer);
 640
 641         return (err) ? err : cnt;
 642 }
 643
 644 #ifdef CONFIG_KMOD
 645 static void try_to_load(int fb)
 646 {
 647         request_module("fb%d", fb);
 648 }
 649 #endif /* CONFIG_KMOD */
 650
 651 int
 652 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
 653 {
 654         int xoffset = var->xoffset;
 655         int yoffset = var->yoffset;
 656         int err;
 657
 658         if (xoffset < 0 || yoffset < 0 || !info->fbops->fb_pan_display ||
 659             xoffset + info->var.xres > info->var.xres_virtual ||
 660             yoffset + info->var.yres > info->var.yres_virtual)
 661                 return -EINVAL;
 662         if ((err = info->fbops->fb_pan_display(var, info)))
 663                 return err;
 664         info->var.xoffset = var->xoffset;
 665         info->var.yoffset = var->yoffset;
 666         if (var->vmode & FB_VMODE_YWRAP)
 667                 info->var.vmode |= FB_VMODE_YWRAP;
 668         else
 669                 info->var.vmode &= ~FB_VMODE_YWRAP;
 670         return 0;
 671 }
 672
 673 int
 674 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
 675 {
 676         int err;
 677
 678         if (var->activate & FB_ACTIVATE_INV_MODE) {
 679                 struct fb_videomode mode1, mode2;
 680                 int ret = 0;
 681
 682                 fb_var_to_videomode(&mode1, var);
 683                 fb_var_to_videomode(&mode2, &info->var);
 684                 /* make sure we don't delete the videomode of current var */
 685                 ret = fb_mode_is_equal(&mode1, &mode2);
 686
 687                 if (!ret) {
 688                     struct fb_event event;
 689
 690                     event.info = info;
 691                     event.data = &mode1;
 692                     ret = notifier_call_chain(&fb_notifier_list,
 693                                               FB_EVENT_MODE_DELETE, &event);
 694                 }
 695
 696                 if (!ret)
 697                     fb_delete_videomode(&mode1, &info->modelist);
 698
 699                 return ret;
 700         }
 701
 702         if ((var->activate & FB_ACTIVATE_FORCE) ||
 703             memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
 704                 if (!info->fbops->fb_check_var) {
 705                         *var = info->var;
 706                         return 0;
 707                 }
 708
 709                 if ((err = info->fbops->fb_check_var(var, info)))
 710                         return err;
 711
 712                 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
 713                         struct fb_videomode mode;
 714                         int err = 0;
 715
 716                         info->var = *var;
 717                         if (info->fbops->fb_set_par)
 718                                 info->fbops->fb_set_par(info);
 719
 720                         fb_pan_display(info, &info->var);
 721
 722                         fb_set_cmap(&info->cmap, info);
 723
 724                         fb_var_to_videomode(&mode, &info->var);
 725
 726                         if (info->modelist.prev && info->modelist.next &&
 727                             !list_empty(&info->modelist))
 728                                 err = fb_add_videomode(&mode, &info->modelist);
 729
 730                         if (!err && info->flags & FBINFO_MISC_USEREVENT) {
 731                                 struct fb_event event;
 732
 733                                 info->flags &= ~FBINFO_MISC_USEREVENT;
 734                                 event.info = info;
 735                                 notifier_call_chain(&fb_notifier_list,
 736                                                     FB_EVENT_MODE_CHANGE,
 737                                                     &event);
 738                         }
 739                 }
 740         }
 741         return 0;
 742 }
 743
 744 int
 745 fb_blank(struct fb_info *info, int blank)
 746 {
 747         int ret = -EINVAL;
 748
 749         if (blank > FB_BLANK_POWERDOWN)
 750                 blank = FB_BLANK_POWERDOWN;
 751
 752         if (info->fbops->fb_blank)
 753                 ret = info->fbops->fb_blank(blank, info);
 754
 755         if (!ret) {
 756                 struct fb_event event;
 757
 758                 event.info = info;
 759                 event.data = &blank;
 760                 notifier_call_chain(&fb_notifier_list, FB_EVENT_BLANK, &event);
 761         }
 762
 763         return ret;
 764 }
 765
 766 static int
 767 fb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
 768          unsigned long arg)
 769 {
 770         int fbidx = iminor(inode);
 771         struct fb_info *info = registered_fb[fbidx];
 772         struct fb_ops *fb = info->fbops;
 773         struct fb_var_screeninfo var;
 774         struct fb_fix_screeninfo fix;
 775         struct fb_con2fbmap con2fb;
 776         struct fb_cmap_user cmap;
 777         struct fb_event event;
 778         void __user *argp = (void __user *)arg;
 779         int i;
 780
 781         if (!fb)
 782                 return -ENODEV;
 783         switch (cmd) {
 784         case FBIOGET_VSCREENINFO:
 785                 return copy_to_user(argp, &info->var,
 786                                     sizeof(var)) ? -EFAULT : 0;
 787         case FBIOPUT_VSCREENINFO:
 788                 if (copy_from_user(&var, argp, sizeof(var)))
 789                         return -EFAULT;
 790                 acquire_console_sem();
 791                 info->flags |= FBINFO_MISC_USEREVENT;
 792                 i = fb_set_var(info, &var);
 793                 info->flags &= ~FBINFO_MISC_USEREVENT;
 794                 release_console_sem();
 795                 if (i) return i;
 796                 if (copy_to_user(argp, &var, sizeof(var)))
 797                         return -EFAULT;
 798                 return 0;
 799         case FBIOGET_FSCREENINFO:
 800                 return copy_to_user(argp, &info->fix,
 801                                     sizeof(fix)) ? -EFAULT : 0;
 802         case FBIOPUTCMAP:
 803                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
 804                         return -EFAULT;
 805                 return (fb_set_user_cmap(&cmap, info));
 806         case FBIOGETCMAP:
 807                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
 808                         return -EFAULT;
 809                 return fb_cmap_to_user(&info->cmap, &cmap);
 810         case FBIOPAN_DISPLAY:
 811                 if (copy_from_user(&var, argp, sizeof(var)))
 812                         return -EFAULT;
 813                 acquire_console_sem();
 814                 i = fb_pan_display(info, &var);
 815                 release_console_sem();
 816                 if (i)
 817                         return i;
 818                 if (copy_to_user(argp, &var, sizeof(var)))
 819                         return -EFAULT;
 820                 return 0;
 821         case FBIO_CURSOR:
 822                 return -EINVAL;
 823         case FBIOGET_CON2FBMAP:
 824                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
 825                         return -EFAULT;
 826                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
 827                     return -EINVAL;
 828                 con2fb.framebuffer = -1;
 829                 event.info = info;
 830                 event.data = &con2fb;
 831                 notifier_call_chain(&fb_notifier_list,
 832                                     FB_EVENT_GET_CONSOLE_MAP, &event);
 833                 return copy_to_user(argp, &con2fb,
 834                                     sizeof(con2fb)) ? -EFAULT : 0;
 835         case FBIOPUT_CON2FBMAP:
 836                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
 837                         return - EFAULT;
 838                 if (con2fb.console < 0 || con2fb.console > MAX_NR_CONSOLES)
 839                     return -EINVAL;
 840                 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
 841                     return -EINVAL;
 842 #ifdef CONFIG_KMOD
 843                 if (!registered_fb[con2fb.framebuffer])
 844                     try_to_load(con2fb.framebuffer);
 845 #endif /* CONFIG_KMOD */
 846                 if (!registered_fb[con2fb.framebuffer])
 847                     return -EINVAL;
 848                 event.info = info;
 849                 event.data = &con2fb;
 850                 return notifier_call_chain(&fb_notifier_list,
 851                                            FB_EVENT_SET_CONSOLE_MAP,
 852                                            &event);
 853         case FBIOBLANK:
 854                 acquire_console_sem();
 855                 info->flags |= FBINFO_MISC_USEREVENT;
 856                 i = fb_blank(info, arg);
 857                 info->flags &= ~FBINFO_MISC_USEREVENT;
 858                 release_console_sem();
 859                 return i;
 860         default:
 861                 if (fb->fb_ioctl == NULL)
 862                         return -EINVAL;
 863                 return fb->fb_ioctl(inode, file, cmd, arg, info);
 864         }
 865 }
 866
 867 #ifdef CONFIG_COMPAT
 868 static long
 869 fb_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 870 {
 871         int fbidx = iminor(file->f_dentry->d_inode);
 872         struct fb_info *info = registered_fb[fbidx];
 873         struct fb_ops *fb = info->fbops;
 874         long ret;
 875
 876         if (fb->fb_compat_ioctl == NULL)
 877                 return -ENOIOCTLCMD;
 878         lock_kernel();
 879         ret = fb->fb_compat_ioctl(file, cmd, arg, info);
 880         unlock_kernel();
 881         return ret;
 882 }
 883 #endif
 884
 885 static int
 886 fb_mmap(struct file *file, struct vm_area_struct * vma)
 887 {
 888         int fbidx = iminor(file->f_dentry->d_inode);
 889         struct fb_info *info = registered_fb[fbidx];
 890         struct fb_ops *fb = info->fbops;
 891         unsigned long off;
 892 #if !defined(__sparc__) || defined(__sparc_v9__)
 893         unsigned long start;
 894         u32 len;
 895 #endif
 896
 897         if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
 898                 return -EINVAL;
 899         off = vma->vm_pgoff << PAGE_SHIFT;
 900         if (!fb)
 901                 return -ENODEV;
 902         if (fb->fb_mmap) {
 903                 int res;
 904                 lock_kernel();
 905                 res = fb->fb_mmap(info, file, vma);
 906                 unlock_kernel();
 907                 return res;
 908         }
 909
 910 #if defined(__sparc__) && !defined(__sparc_v9__)
 911         /* Should never get here, all fb drivers should have their own
 912            mmap routines */
 913         return -EINVAL;
 914 #else
 915         /* !sparc32... */
 916         lock_kernel();
 917
 918         /* frame buffer memory */
 919         start = info->fix.smem_start;
 920         len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
 921         if (off >= len) {
 922                 /* memory mapped io */
 923                 off -= len;
 924                 if (info->var.accel_flags) {
 925                         unlock_kernel();
 926                         return -EINVAL;
 927                 }
 928                 start = info->fix.mmio_start;
 929                 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
 930         }
 931         unlock_kernel();
 932         start &= PAGE_MASK;
 933         if ((vma->vm_end - vma->vm_start + off) > len)
 934                 return -EINVAL;
 935         off += start;
 936         vma->vm_pgoff = off >> PAGE_SHIFT;
 937         /* This is an IO map - tell maydump to skip this VMA */
 938         vma->vm_flags |= VM_IO | VM_RESERVED;
 939 #if defined(__sparc_v9__)
 940         if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
 941                                 vma->vm_end - vma->vm_start, vma->vm_page_prot))
 942                 return -EAGAIN;
 943 #else
 944 #if defined(__mc68000__)
 945 #if defined(CONFIG_SUN3)
 946         pgprot_val(vma->vm_page_prot) |= SUN3_PAGE_NOCACHE;
 947 #elif defined(CONFIG_MMU)
 948         if (CPU_IS_020_OR_030)
 949                 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE030;
 950         if (CPU_IS_040_OR_060) {
 951                 pgprot_val(vma->vm_page_prot) &= _CACHEMASK040;
 952                 /* Use no-cache mode, serialized */
 953                 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE_S;
 954         }
 955 #endif
 956 #elif defined(__powerpc__)
 957         vma->vm_page_prot = phys_mem_access_prot(file, off,
 958                                                  vma->vm_end - vma->vm_start,
 959                                                  vma->vm_page_prot);
 960 #elif defined(__alpha__)
 961         /* Caching is off in the I/O space quadrant by design.  */
 962 #elif defined(__i386__) || defined(__x86_64__)
 963         if (boot_cpu_data.x86 > 3)
 964                 pgprot_val(vma->vm_page_prot) |= _PAGE_PCD;
 965 #elif defined(__mips__)
 966         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 967 #elif defined(__hppa__)
 968         pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
 969 #elif defined(__arm__) || defined(__sh__) || defined(__m32r__)
 970         vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
 971 #elif defined(__ia64__)
 972         if (efi_range_is_wc(vma->vm_start, vma->vm_end - vma->vm_start))
 973                 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
 974         else
 975                 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 976 #else
 977 #warning What do we have to do here??
 978 #endif
 979         if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
 980                              vma->vm_end - vma->vm_start, vma->vm_page_prot))
 981                 return -EAGAIN;
 982 #endif /* !__sparc_v9__ */
 983         return 0;
 984 #endif /* !sparc32 */
 985 }
 986
 987 static int
 988 fb_open(struct inode *inode, struct file *file)
 989 {
 990         int fbidx = iminor(inode);
 991         struct fb_info *info;
 992         int res = 0;
 993
 994         if (fbidx >= FB_MAX)
 995                 return -ENODEV;
 996 #ifdef CONFIG_KMOD
 997         if (!(info = registered_fb[fbidx]))
 998                 try_to_load(fbidx);
 999 #endif /* CONFIG_KMOD */
1000         if (!(info = registered_fb[fbidx]))
1001                 return -ENODEV;
1002         if (!try_module_get(info->fbops->owner))
1003                 return -ENODEV;
1004         if (info->fbops->fb_open) {
1005                 res = info->fbops->fb_open(info,1);
1006                 if (res)
1007                         module_put(info->fbops->owner);
1008         }
1009         return res;
1010 }
1011
1012 static int
1013 fb_release(struct inode *inode, struct file *file)
1014 {
1015         int fbidx = iminor(inode);
1016         struct fb_info *info;
1017
1018         lock_kernel();
1019         info = registered_fb[fbidx];
1020         if (info->fbops->fb_release)
1021                 info->fbops->fb_release(info,1);
1022         module_put(info->fbops->owner);
1023         unlock_kernel();
1024         return 0;
1025 }
1026
1027 static struct file_operations fb_fops = {
1028         .owner =        THIS_MODULE,
1029         .read =         fb_read,
1030         .write =        fb_write,
1031         .ioctl =        fb_ioctl,
1032 #ifdef CONFIG_COMPAT
1033         .compat_ioctl = fb_compat_ioctl,
1034 #endif
1035         .mmap =         fb_mmap,
1036         .open =         fb_open,
1037         .release =      fb_release,
1038 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1039         .get_unmapped_area = get_fb_unmapped_area,
1040 #endif
1041 };
1042
1043 static struct class_simple *fb_class;
1044
1045 /**
1046  *      register_framebuffer - registers a frame buffer device
1047  *      @fb_info: frame buffer info structure
1048  *
1049  *      Registers a frame buffer device @fb_info.
1050  *
1051  *      Returns negative errno on error, or zero for success.
1052  *
1053  */
1054
1055 int
1056 register_framebuffer(struct fb_info *fb_info)
1057 {
1058         int i;
1059         struct fb_event event;
1060
1061         if (num_registered_fb == FB_MAX)
1062                 return -ENXIO;
1063         num_registered_fb++;
1064         for (i = 0 ; i < FB_MAX; i++)
1065                 if (!registered_fb[i])
1066                         break;
1067         fb_info->node = i;
1068
1069         fb_info->class_device = class_simple_device_add(fb_class, MKDEV(FB_MAJOR, i),
1070                                     fb_info->device, "fb%d", i);
1071         if (IS_ERR(fb_info->class_device)) {
1072                 /* Not fatal */
1073                 printk(KERN_WARNING "Unable to create class_device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->class_device));
1074                 fb_info->class_device = NULL;
1075         } else
1076                 fb_init_class_device(fb_info);
1077
1078         if (fb_info->pixmap.addr == NULL) {
1079                 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1080                 if (fb_info->pixmap.addr) {
1081                         fb_info->pixmap.size = FBPIXMAPSIZE;
1082                         fb_info->pixmap.buf_align = 1;
1083                         fb_info->pixmap.scan_align = 1;
1084                         fb_info->pixmap.access_align = 4;
1085                         fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1086                 }
1087         }
1088         fb_info->pixmap.offset = 0;
1089
1090         if (!fb_info->modelist.prev ||
1091             !fb_info->modelist.next ||
1092             list_empty(&fb_info->modelist)) {
1093                 struct fb_videomode mode;
1094
1095                 INIT_LIST_HEAD(&fb_info->modelist);
1096                 fb_var_to_videomode(&mode, &fb_info->var);
1097                 fb_add_videomode(&mode, &fb_info->modelist);
1098         }
1099
1100         registered_fb[i] = fb_info;
1101
1102         devfs_mk_cdev(MKDEV(FB_MAJOR, i),
1103                         S_IFCHR | S_IRUGO | S_IWUGO, "fb/%d", i);
1104         event.info = fb_info;
1105         notifier_call_chain(&fb_notifier_list,
1106                             FB_EVENT_FB_REGISTERED, &event);
1107         return 0;
1108 }
1109
1110
1111 /**
1112  *      unregister_framebuffer - releases a frame buffer device
1113  *      @fb_info: frame buffer info structure
1114  *
1115  *      Unregisters a frame buffer device @fb_info.
1116  *
1117  *      Returns negative errno on error, or zero for success.
1118  *
1119  */
1120
1121 int
1122 unregister_framebuffer(struct fb_info *fb_info)
1123 {
1124         int i;
1125
1126         i = fb_info->node;
1127         if (!registered_fb[i])
1128                 return -EINVAL;
1129         devfs_remove("fb/%d", i);
1130
1131         if (fb_info->pixmap.addr && (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1132                 kfree(fb_info->pixmap.addr);
1133         fb_destroy_modelist(&fb_info->modelist);
1134         registered_fb[i]=NULL;
1135         num_registered_fb--;
1136         fb_cleanup_class_device(fb_info);
1137         class_simple_device_remove(MKDEV(FB_MAJOR, i));
1138         return 0;
1139 }
1140
1141 /**
1142  *      fb_register_client - register a client notifier
1143  *      @nb: notifier block to callback on events
1144  */
1145 int fb_register_client(struct notifier_block *nb)
1146 {
1147         return notifier_chain_register(&fb_notifier_list, nb);
1148 }
1149
1150 /**
1151  *      fb_unregister_client - unregister a client notifier
1152  *      @nb: notifier block to callback on events
1153  */
1154 int fb_unregister_client(struct notifier_block *nb)
1155 {
1156         return notifier_chain_unregister(&fb_notifier_list, nb);
1157 }
1158
1159 /**
1160  *      fb_set_suspend - low level driver signals suspend
1161  *      @info: framebuffer affected
1162  *      @state: 0 = resuming, !=0 = suspending
1163  *
1164  *      This is meant to be used by low level drivers to
1165  *      signal suspend/resume to the core & clients.
1166  *      It must be called with the console semaphore held
1167  */
1168 void fb_set_suspend(struct fb_info *info, int state)
1169 {
1170         struct fb_event event;
1171
1172         event.info = info;
1173         if (state) {
1174                 notifier_call_chain(&fb_notifier_list, FB_EVENT_SUSPEND, &event);
1175                 info->state = FBINFO_STATE_SUSPENDED;
1176         } else {
1177                 info->state = FBINFO_STATE_RUNNING;
1178                 notifier_call_chain(&fb_notifier_list, FB_EVENT_RESUME, &event);
1179         }
1180 }
1181
1182 /**
1183  *      fbmem_init - init frame buffer subsystem
1184  *
1185  *      Initialize the frame buffer subsystem.
1186  *
1187  *      NOTE: This function is _only_ to be called by drivers/char/mem.c.
1188  *
1189  */
1190
1191 static int __init
1192 fbmem_init(void)
1193 {
1194         create_proc_read_entry("fb", 0, NULL, fbmem_read_proc, NULL);
1195
1196         devfs_mk_dir("fb");
1197         if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1198                 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1199
1200         fb_class = class_simple_create(THIS_MODULE, "graphics");
1201         if (IS_ERR(fb_class)) {
1202                 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1203                 fb_class = NULL;
1204         }
1205         return 0;
1206 }
1207
1208 #ifdef MODULE
1209 module_init(fbmem_init);
1210 static void __exit
1211 fbmem_exit(void)
1212 {
1213         class_simple_destroy(fb_class);
1214 }
1215
1216 module_exit(fbmem_exit);
1217 MODULE_LICENSE("GPL");
1218 MODULE_DESCRIPTION("Framebuffer base");
1219 #else
1220 subsys_initcall(fbmem_init);
1221 #endif
1222
1223 int fb_new_modelist(struct fb_info *info)
1224 {
1225         struct fb_event event;
1226         struct fb_var_screeninfo var = info->var;
1227         struct list_head *pos, *n;
1228         struct fb_modelist *modelist;
1229         struct fb_videomode *m, mode;
1230         int err = 1;
1231
1232         list_for_each_safe(pos, n, &info->modelist) {
1233                 modelist = list_entry(pos, struct fb_modelist, list);
1234                 m = &modelist->mode;
1235                 fb_videomode_to_var(&var, m);
1236                 var.activate = FB_ACTIVATE_TEST;
1237                 err = fb_set_var(info, &var);
1238                 fb_var_to_videomode(&mode, &var);
1239                 if (err || !fb_mode_is_equal(m, &mode)) {
1240                         list_del(pos);
1241                         kfree(pos);
1242                 }
1243         }
1244
1245         err = 1;
1246
1247         if (!list_empty(&info->modelist)) {
1248                 event.info = info;
1249                 err = notifier_call_chain(&fb_notifier_list,
1250                                            FB_EVENT_NEW_MODELIST,
1251                                            &event);
1252         }
1253
1254         return err;
1255 }
1256
1257 static char *video_options[FB_MAX];
1258 static int ofonly;
1259
1260 /**
1261  * fb_get_options - get kernel boot parameters
1262  * @name:   framebuffer name as it would appear in
1263  *          the boot parameter line
1264  *          (video=<name>:<options>)
1265  * @option: the option will be stored here
1266  *
1267  * NOTE: Needed to maintain backwards compatibility
1268  */
1269 int fb_get_options(char *name, char **option)
1270 {
1271         char *opt, *options = NULL;
1272         int opt_len, retval = 0;
1273         int name_len = strlen(name), i;
1274
1275         if (name_len && ofonly && strncmp(name, "offb", 4))
1276                 retval = 1;
1277
1278         if (name_len && !retval) {
1279                 for (i = 0; i < FB_MAX; i++) {
1280                         if (video_options[i] == NULL)
1281                                 continue;
1282                         opt_len = strlen(video_options[i]);
1283                         if (!opt_len)
1284                                 continue;
1285                         opt = video_options[i];
1286                         if (!strncmp(name, opt, name_len) &&
1287                             opt[name_len] == ':')
1288                                 options = opt + name_len + 1;
1289                 }
1290         }
1291         if (options && !strncmp(options, "off", 3))
1292                 retval = 1;
1293
1294         if (option)
1295                 *option = options;
1296
1297         return retval;
1298 }
1299
1300
1301 extern const char *global_mode_option;
1302
1303 /**
1304  *      video_setup - process command line options
1305  *      @options: string of options
1306  *
1307  *      Process command line options for frame buffer subsystem.
1308  *
1309  *      NOTE: This function is a __setup and __init function.
1310  *            It only stores the options.  Drivers have to call
1311  *            fb_get_options() as necessary.
1312  *
1313  *      Returns zero.
1314  *
1315  */
1316 int __init video_setup(char *options)
1317 {
1318         int i, global = 0;
1319
1320         if (!options || !*options)
1321                 global = 1;
1322
1323         if (!global && !strncmp(options, "ofonly", 6)) {
1324                 ofonly = 1;
1325                 global = 1;
1326         }
1327
1328         if (!global && !strstr(options, "fb:")) {
1329                 global_mode_option = options;
1330                 global = 1;
1331         }
1332
1333         if (!global) {
1334                 for (i = 0; i < FB_MAX; i++) {
1335                         if (video_options[i] == NULL) {
1336                                 video_options[i] = options;
1337                                 break;
1338                         }
1339
1340                 }
1341         }
1342
1343         return 0;
1344 }
1345 __setup("video=", video_setup);
1346
1347     /*
1348      *  Visible symbols for modules
1349      */
1350
1351 EXPORT_SYMBOL(register_framebuffer);
1352 EXPORT_SYMBOL(unregister_framebuffer);
1353 EXPORT_SYMBOL(num_registered_fb);
1354 EXPORT_SYMBOL(registered_fb);
1355 EXPORT_SYMBOL(fb_prepare_logo);
1356 EXPORT_SYMBOL(fb_show_logo);
1357 EXPORT_SYMBOL(fb_set_var);
1358 EXPORT_SYMBOL(fb_blank);
1359 EXPORT_SYMBOL(fb_pan_display);
1360 EXPORT_SYMBOL(fb_get_buffer_offset);
1361 EXPORT_SYMBOL(fb_iomove_buf_unaligned);
1362 EXPORT_SYMBOL(fb_iomove_buf_aligned);
1363 EXPORT_SYMBOL(fb_sysmove_buf_unaligned);
1364 EXPORT_SYMBOL(fb_sysmove_buf_aligned);
1365 EXPORT_SYMBOL(fb_set_suspend);
1366 EXPORT_SYMBOL(fb_register_client);
1367 EXPORT_SYMBOL(fb_unregister_client);
1368 EXPORT_SYMBOL(fb_get_options);
1369 EXPORT_SYMBOL(fb_new_modelist);
1370
1371 MODULE_LICENSE("GPL");