SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/video/fbmem.c

   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                        struct fb_fix_screeninfo *fix)
  67 {
  68         int depth = 0;
  69
  70         if (fix->visual == FB_VISUAL_MONO01 ||
  71             fix->visual == FB_VISUAL_MONO10)
  72                 depth = 1;
  73         else {
  74                 if (var->green.length == var->blue.length &&
  75                     var->green.length == var->red.length &&
  76                     var->green.offset == var->blue.offset &&
  77                     var->green.offset == var->red.offset)
  78                         depth = var->green.length;
  79                 else
  80                         depth = var->green.length + var->red.length +
  81                                 var->blue.length;
  82         }
  83
  84         return depth;
  85 }
  86 EXPORT_SYMBOL(fb_get_color_depth);
  87
  88 /*
  89  * Data padding functions.
  90  */
  91 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
  92 {
  93         __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
  94 }
  95 EXPORT_SYMBOL(fb_pad_aligned_buffer);
  96
  97 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
  98                                 u32 shift_high, u32 shift_low, u32 mod)
  99 {
 100         u8 mask = (u8) (0xfff << shift_high), tmp;
 101         int i, j;
 102
 103         for (i = height; i--; ) {
 104                 for (j = 0; j < idx; j++) {
 105                         tmp = dst[j];
 106                         tmp &= mask;
 107                         tmp |= *src >> shift_low;
 108                         dst[j] = tmp;
 109                         tmp = *src << shift_high;
 110                         dst[j+1] = tmp;
 111                         src++;
 112                 }
 113                 tmp = dst[idx];
 114                 tmp &= mask;
 115                 tmp |= *src >> shift_low;
 116                 dst[idx] = tmp;
 117                 if (shift_high < mod) {
 118                         tmp = *src << shift_high;
 119                         dst[idx+1] = tmp;
 120                 }
 121                 src++;
 122                 dst += d_pitch;
 123         }
 124 }
 125 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
 126
 127 /*
 128  * we need to lock this section since fb_cursor
 129  * may use fb_imageblit()
 130  */
 131 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
 132 {
 133         u32 align = buf->buf_align - 1, offset;
 134         char *addr = buf->addr;
 135
 136         /* If IO mapped, we need to sync before access, no sharing of
 137          * the pixmap is done
 138          */
 139         if (buf->flags & FB_PIXMAP_IO) {
 140                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 141                         info->fbops->fb_sync(info);
 142                 return addr;
 143         }
 144
 145         /* See if we fit in the remaining pixmap space */
 146         offset = buf->offset + align;
 147         offset &= ~align;
 148         if (offset + size > buf->size) {
 149                 /* We do not fit. In order to be able to re-use the buffer,
 150                  * we must ensure no asynchronous DMA'ing or whatever operation
 151                  * is in progress, we sync for that.
 152                  */
 153                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 154                         info->fbops->fb_sync(info);
 155                 offset = 0;
 156         }
 157         buf->offset = offset + size;
 158         addr += offset;
 159
 160         return addr;
 161 }
 162
 163 #ifdef CONFIG_LOGO
 164 #include <linux/linux_logo.h>
 165
 166 static inline unsigned safe_shift(unsigned d, int n)
 167 {
 168         return n < 0 ? d >> -n : d << n;
 169 }
 170
 171 static void fb_set_logocmap(struct fb_info *info,
 172                                    const struct linux_logo *logo)
 173 {
 174         struct fb_cmap palette_cmap;
 175         u16 palette_green[16];
 176         u16 palette_blue[16];
 177         u16 palette_red[16];
 178         int i, j, n;
 179         const unsigned char *clut = logo->clut;
 180
 181         palette_cmap.start = 0;
 182         palette_cmap.len = 16;
 183         palette_cmap.red = palette_red;
 184         palette_cmap.green = palette_green;
 185         palette_cmap.blue = palette_blue;
 186         palette_cmap.transp = NULL;
 187
 188         for (i = 0; i < logo->clutsize; i += n) {
 189                 n = logo->clutsize - i;
 190                 /* palette_cmap provides space for only 16 colors at once */
 191                 if (n > 16)
 192                         n = 16;
 193                 palette_cmap.start = 32 + i;
 194                 palette_cmap.len = n;
 195                 for (j = 0; j < n; ++j) {
 196                         palette_cmap.red[j] = clut[0] << 8 | clut[0];
 197                         palette_cmap.green[j] = clut[1] << 8 | clut[1];
 198                         palette_cmap.blue[j] = clut[2] << 8 | clut[2];
 199                         clut += 3;
 200                 }
 201                 fb_set_cmap(&palette_cmap, info);
 202         }
 203 }
 204
 205 static void  fb_set_logo_truepalette(struct fb_info *info,
 206                                             const struct linux_logo *logo,
 207                                             u32 *palette)
 208 {
 209         unsigned char mask[9] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
 210         unsigned char redmask, greenmask, bluemask;
 211         int redshift, greenshift, blueshift;
 212         int i;
 213         const unsigned char *clut = logo->clut;
 214
 215         /*
 216          * We have to create a temporary palette since console palette is only
 217          * 16 colors long.
 218          */
 219         /* Bug: Doesn't obey msb_right ... (who needs that?) */
 220         redmask   = mask[info->var.red.length   < 8 ? info->var.red.length   : 8];
 221         greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
 222         bluemask  = mask[info->var.blue.length  < 8 ? info->var.blue.length  : 8];
 223         redshift   = info->var.red.offset   - (8 - info->var.red.length);
 224         greenshift = info->var.green.offset - (8 - info->var.green.length);
 225         blueshift  = info->var.blue.offset  - (8 - info->var.blue.length);
 226
 227         for ( i = 0; i < logo->clutsize; i++) {
 228                 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
 229                                  safe_shift((clut[1] & greenmask), greenshift) |
 230                                  safe_shift((clut[2] & bluemask), blueshift));
 231                 clut += 3;
 232         }
 233 }
 234
 235 static void fb_set_logo_directpalette(struct fb_info *info,
 236                                              const struct linux_logo *logo,
 237                                              u32 *palette)
 238 {
 239         int redshift, greenshift, blueshift;
 240         int i;
 241
 242         redshift = info->var.red.offset;
 243         greenshift = info->var.green.offset;
 244         blueshift = info->var.blue.offset;
 245
 246         for (i = 32; i < logo->clutsize; i++)
 247                 palette[i] = i << redshift | i << greenshift | i << blueshift;
 248 }
 249
 250 static void fb_set_logo(struct fb_info *info,
 251                                const struct linux_logo *logo, u8 *dst,
 252                                int depth)
 253 {
 254         int i, j, k;
 255         const u8 *src = logo->data;
 256         u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
 257         u8 fg = 1, d;
 258
 259         if (fb_get_color_depth(&info->var, &info->fix) == 3)
 260                 fg = 7;
 261
 262         if (info->fix.visual == FB_VISUAL_MONO01 ||
 263             info->fix.visual == FB_VISUAL_MONO10)
 264                 fg = ~((u8) (0xfff << info->var.green.length));
 265
 266         switch (depth) {
 267         case 4:
 268                 for (i = 0; i < logo->height; i++)
 269                         for (j = 0; j < logo->width; src++) {
 270                                 *dst++ = *src >> 4;
 271                                 j++;
 272                                 if (j < logo->width) {
 273                                         *dst++ = *src & 0x0f;
 274                                         j++;
 275                                 }
 276                         }
 277                 break;
 278         case 1:
 279                 for (i = 0; i < logo->height; i++) {
 280                         for (j = 0; j < logo->width; src++) {
 281                                 d = *src ^ xor;
 282                                 for (k = 7; k >= 0; k--) {
 283                                         *dst++ = ((d >> k) & 1) ? fg : 0;
 284                                         j++;
 285                                 }
 286                         }
 287                 }
 288                 break;
 289         }
 290 }
 291
 292 /*
 293  * Three (3) kinds of logo maps exist.  linux_logo_clut224 (>16 colors),
 294  * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors).  Depending on
 295  * the visual format and color depth of the framebuffer, the DAC, the
 296  * pseudo_palette, and the logo data will be adjusted accordingly.
 297  *
 298  * Case 1 - linux_logo_clut224:
 299  * Color exceeds the number of console colors (16), thus we set the hardware DAC
 300  * using fb_set_cmap() appropriately.  The "needs_cmapreset"  flag will be set.
 301  *
 302  * For visuals that require color info from the pseudo_palette, we also construct
 303  * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
 304  * will be set.
 305  *
 306  * Case 2 - linux_logo_vga16:
 307  * The number of colors just matches the console colors, thus there is no need
 308  * to set the DAC or the pseudo_palette.  However, the bitmap is packed, ie,
 309  * each byte contains color information for two pixels (upper and lower nibble).
 310  * To be consistent with fb_imageblit() usage, we therefore separate the two
 311  * nibbles into separate bytes. The "depth" flag will be set to 4.
 312  *
 313  * Case 3 - linux_logo_mono:
 314  * This is similar with Case 2.  Each byte contains information for 8 pixels.
 315  * We isolate each bit and expand each into a byte. The "depth" flag will
 316  * be set to 1.
 317  */
 318 static struct logo_data {
 319         int depth;
 320         int needs_directpalette;
 321         int needs_truepalette;
 322         int needs_cmapreset;
 323         const struct linux_logo *logo;
 324 } fb_logo;
 325
 326 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
 327 {
 328         u32 size = width * height, i;
 329
 330         out += size - 1;
 331
 332         for (i = size; i--; )
 333                 *out-- = *in++;
 334 }
 335
 336 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
 337 {
 338         int i, j, w = width - 1;
 339
 340         for (i = 0; i < height; i++)
 341                 for (j = 0; j < width; j++)
 342                         out[height * j + w - i] = *in++;
 343 }
 344
 345 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
 346 {
 347         int i, j, w = width - 1;
 348
 349         for (i = 0; i < height; i++)
 350                 for (j = 0; j < width; j++)
 351                         out[height * (w - j) + i] = *in++;
 352 }
 353
 354 static void fb_rotate_logo(struct fb_info *info, u8 *dst,
 355                            struct fb_image *image, int rotate)
 356 {
 357         u32 tmp;
 358
 359         if (rotate == FB_ROTATE_UD) {
 360                 image->dx = info->var.xres - image->width;
 361                 image->dy = info->var.yres - image->height;
 362                 fb_rotate_logo_ud(image->data, dst, image->width,
 363                                   image->height);
 364         } else if (rotate == FB_ROTATE_CW) {
 365                 tmp = image->width;
 366                 image->width = image->height;
 367                 image->height = tmp;
 368                 image->dx = info->var.xres - image->height;
 369                 fb_rotate_logo_cw(image->data, dst, image->width,
 370                                   image->height);
 371         } else if (rotate == FB_ROTATE_CCW) {
 372                 tmp = image->width;
 373                 image->width = image->height;
 374                 image->height = tmp;
 375                 image->dy = info->var.yres - image->width;
 376                 fb_rotate_logo_ccw(image->data, dst, image->width,
 377                                    image->height);
 378         }
 379
 380         image->data = dst;
 381 }
 382
 383 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
 384                             int rotate)
 385 {
 386         int x;
 387
 388         if (rotate == FB_ROTATE_UR) {
 389                 for (x = 0; x < num_online_cpus() &&
 390                              x * (fb_logo.logo->width + 8) <=
 391                              info->var.xres - fb_logo.logo->width; x++) {
 392                         info->fbops->fb_imageblit(info, image);
 393                         image->dx += fb_logo.logo->width + 8;
 394                 }
 395         } else if (rotate == FB_ROTATE_UD) {
 396                 for (x = 0; x < num_online_cpus() &&
 397                              x * (fb_logo.logo->width + 8) <=
 398                              info->var.xres - fb_logo.logo->width; x++) {
 399                         info->fbops->fb_imageblit(info, image);
 400                         image->dx -= fb_logo.logo->width + 8;
 401                 }
 402         } else if (rotate == FB_ROTATE_CW) {
 403                 for (x = 0; x < num_online_cpus() &&
 404                              x * (fb_logo.logo->width + 8) <=
 405                              info->var.yres - fb_logo.logo->width; x++) {
 406                         info->fbops->fb_imageblit(info, image);
 407                         image->dy += fb_logo.logo->width + 8;
 408                 }
 409         } else if (rotate == FB_ROTATE_CCW) {
 410                 for (x = 0; x < num_online_cpus() &&
 411                              x * (fb_logo.logo->width + 8) <=
 412                              info->var.yres - fb_logo.logo->width; x++) {
 413                         info->fbops->fb_imageblit(info, image);
 414                         image->dy -= fb_logo.logo->width + 8;
 415                 }
 416         }
 417 }
 418
 419 int fb_prepare_logo(struct fb_info *info, int rotate)
 420 {
 421         int depth = fb_get_color_depth(&info->var, &info->fix);
 422         int yres;
 423
 424         memset(&fb_logo, 0, sizeof(struct logo_data));
 425
 426         if (info->flags & FBINFO_MISC_TILEBLITTING)
 427                 return 0;
 428
 429         if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
 430                 depth = info->var.blue.length;
 431                 if (info->var.red.length < depth)
 432                         depth = info->var.red.length;
 433                 if (info->var.green.length < depth)
 434                         depth = info->var.green.length;
 435         }
 436
 437         if (depth >= 8) {
 438                 switch (info->fix.visual) {
 439                 case FB_VISUAL_TRUECOLOR:
 440                         fb_logo.needs_truepalette = 1;
 441                         break;
 442                 case FB_VISUAL_DIRECTCOLOR:
 443                         fb_logo.needs_directpalette = 1;
 444                         fb_logo.needs_cmapreset = 1;
 445                         break;
 446                 case FB_VISUAL_PSEUDOCOLOR:
 447                         fb_logo.needs_cmapreset = 1;
 448                         break;
 449                 }
 450         }
 451
 452         /* Return if no suitable logo was found */
 453         fb_logo.logo = fb_find_logo(depth);
 454
 455         if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
 456                 yres = info->var.yres;
 457         else
 458                 yres = info->var.xres;
 459
 460         if (fb_logo.logo && fb_logo.logo->height > yres) {
 461                 fb_logo.logo = NULL;
 462                 return 0;
 463         }
 464
 465         /* What depth we asked for might be different from what we get */
 466         if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
 467                 fb_logo.depth = 8;
 468         else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
 469                 fb_logo.depth = 4;
 470         else
 471                 fb_logo.depth = 1;
 472         return fb_logo.logo->height;
 473 }
 474
 475 int fb_show_logo(struct fb_info *info, int rotate)
 476 {
 477         u32 *palette = NULL, *saved_pseudo_palette = NULL;
 478         unsigned char *logo_new = NULL, *logo_rotate = NULL;
 479         struct fb_image image;
 480
 481         /* Return if the frame buffer is not mapped or suspended */
 482         if (fb_logo.logo == NULL || info->state != FBINFO_STATE_RUNNING)
 483                 return 0;
 484
 485         image.depth = 8;
 486         image.data = fb_logo.logo->data;
 487
 488         if (fb_logo.needs_cmapreset)
 489                 fb_set_logocmap(info, fb_logo.logo);
 490
 491         if (fb_logo.needs_truepalette ||
 492             fb_logo.needs_directpalette) {
 493                 palette = kmalloc(256 * 4, GFP_KERNEL);
 494                 if (palette == NULL)
 495                         return 0;
 496
 497                 if (fb_logo.needs_truepalette)
 498                         fb_set_logo_truepalette(info, fb_logo.logo, palette);
 499                 else
 500                         fb_set_logo_directpalette(info, fb_logo.logo, palette);
 501
 502                 saved_pseudo_palette = info->pseudo_palette;
 503                 info->pseudo_palette = palette;
 504         }
 505
 506         if (fb_logo.depth <= 4) {
 507                 logo_new = kmalloc(fb_logo.logo->width * fb_logo.logo->height,
 508                                    GFP_KERNEL);
 509                 if (logo_new == NULL) {
 510                         kfree(palette);
 511                         if (saved_pseudo_palette)
 512                                 info->pseudo_palette = saved_pseudo_palette;
 513                         return 0;
 514                 }
 515                 image.data = logo_new;
 516                 fb_set_logo(info, fb_logo.logo, logo_new, fb_logo.depth);
 517         }
 518
 519         image.dx = 0;
 520         image.dy = 0;
 521         image.width = fb_logo.logo->width;
 522         image.height = fb_logo.logo->height;
 523
 524         if (rotate) {
 525                 logo_rotate = kmalloc(fb_logo.logo->width *
 526                                       fb_logo.logo->height, GFP_KERNEL);
 527                 if (logo_rotate)
 528                         fb_rotate_logo(info, logo_rotate, &image, rotate);
 529         }
 530
 531         fb_do_show_logo(info, &image, rotate);
 532
 533         kfree(palette);
 534         if (saved_pseudo_palette != NULL)
 535                 info->pseudo_palette = saved_pseudo_palette;
 536         kfree(logo_new);
 537         kfree(logo_rotate);
 538         return fb_logo.logo->height;
 539 }
 540 #else
 541 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
 542 int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
 543 #endif /* CONFIG_LOGO */
 544
 545 static int fbmem_read_proc(char *buf, char **start, off_t offset,
 546                            int len, int *eof, void *private)
 547 {
 548         struct fb_info **fi;
 549         int clen;
 550
 551         clen = 0;
 552         for (fi = registered_fb; fi < &registered_fb[FB_MAX] && len < 4000; fi++)
 553                 if (*fi)
 554                         clen += sprintf(buf + clen, "%d %s\n",
 555                                         (*fi)->node,
 556                                         (*fi)->fix.id);
 557         *start = buf + offset;
 558         if (clen > offset)
 559                 clen -= offset;
 560         else
 561                 clen = 0;
 562         return clen < len ? clen : len;
 563 }
 564
 565 static ssize_t
 566 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 567 {
 568         unsigned long p = *ppos;
 569         struct inode *inode = file->f_dentry->d_inode;
 570         int fbidx = iminor(inode);
 571         struct fb_info *info = registered_fb[fbidx];
 572         u32 *buffer, *dst;
 573         u32 __iomem *src;
 574         int c, i, cnt = 0, err = 0;
 575         unsigned long total_size;
 576
 577         if (!info || ! info->screen_base)
 578                 return -ENODEV;
 579
 580         if (info->state != FBINFO_STATE_RUNNING)
 581                 return -EPERM;
 582
 583         if (info->fbops->fb_read)
 584                 return info->fbops->fb_read(file, buf, count, ppos);
 585
 586         total_size = info->screen_size;
 587         if (total_size == 0)
 588                 total_size = info->fix.smem_len;
 589
 590         if (p >= total_size)
 591             return 0;
 592         if (count >= total_size)
 593             count = total_size;
 594         if (count + p > total_size)
 595                 count = total_size - p;
 596
 597         cnt = 0;
 598         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 599                          GFP_KERNEL);
 600         if (!buffer)
 601                 return -ENOMEM;
 602
 603         src = (u32 __iomem *) (info->screen_base + p);
 604
 605         if (info->fbops->fb_sync)
 606                 info->fbops->fb_sync(info);
 607
 608         while (count) {
 609                 c  = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 610                 dst = buffer;
 611                 for (i = c >> 2; i--; )
 612                         *dst++ = fb_readl(src++);
 613                 if (c & 3) {
 614                         u8 *dst8 = (u8 *) dst;
 615                         u8 __iomem *src8 = (u8 __iomem *) src;
 616
 617                         for (i = c & 3; i--;)
 618                                 *dst8++ = fb_readb(src8++);
 619
 620                         src = (u32 __iomem *) src8;
 621                 }
 622
 623                 if (copy_to_user(buf, buffer, c)) {
 624                         err = -EFAULT;
 625                         break;
 626                 }
 627                 *ppos += c;
 628                 buf += c;
 629                 cnt += c;
 630                 count -= c;
 631         }
 632
 633         kfree(buffer);
 634         return (err) ? err : cnt;
 635 }
 636
 637 static ssize_t
 638 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 639 {
 640         unsigned long p = *ppos;
 641         struct inode *inode = file->f_dentry->d_inode;
 642         int fbidx = iminor(inode);
 643         struct fb_info *info = registered_fb[fbidx];
 644         u32 *buffer, *src;
 645         u32 __iomem *dst;
 646         int c, i, cnt = 0, err;
 647         unsigned long total_size;
 648
 649         if (!info || !info->screen_base)
 650                 return -ENODEV;
 651
 652         if (info->state != FBINFO_STATE_RUNNING)
 653                 return -EPERM;
 654
 655         if (info->fbops->fb_write)
 656                 return info->fbops->fb_write(file, buf, count, ppos);
 657
 658         total_size = info->screen_size;
 659         if (total_size == 0)
 660                 total_size = info->fix.smem_len;
 661
 662         if (p > total_size)
 663             return -ENOSPC;
 664         if (count >= total_size)
 665             count = total_size;
 666         err = 0;
 667         if (count + p > total_size) {
 668             count = total_size - p;
 669             err = -ENOSPC;
 670         }
 671         cnt = 0;
 672         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 673                          GFP_KERNEL);
 674         if (!buffer)
 675                 return -ENOMEM;
 676
 677         dst = (u32 __iomem *) (info->screen_base + p);
 678
 679         if (info->fbops->fb_sync)
 680                 info->fbops->fb_sync(info);
 681
 682         while (count) {
 683                 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 684                 src = buffer;
 685                 if (copy_from_user(src, buf, c)) {
 686                         err = -EFAULT;
 687                         break;
 688                 }
 689                 for (i = c >> 2; i--; )
 690                         fb_writel(*src++, dst++);
 691                 if (c & 3) {
 692                         u8 *src8 = (u8 *) src;
 693                         u8 __iomem *dst8 = (u8 __iomem *) dst;
 694
 695                         for (i = c & 3; i--; )
 696                                 fb_writeb(*src8++, dst8++);
 697
 698                         dst = (u32 __iomem *) dst8;
 699                 }
 700                 *ppos += c;
 701                 buf += c;
 702                 cnt += c;
 703                 count -= c;
 704         }
 705         kfree(buffer);
 706
 707         return (err) ? err : cnt;
 708 }
 709
 710 #ifdef CONFIG_KMOD
 711 static void try_to_load(int fb)
 712 {
 713         request_module("fb%d", fb);
 714 }
 715 #endif /* CONFIG_KMOD */
 716
 717 int
 718 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
 719 {
 720         int xoffset = var->xoffset;
 721         int yoffset = var->yoffset;
 722         int err;
 723
 724         if (xoffset < 0 || yoffset < 0 || !info->fbops->fb_pan_display ||
 725             xoffset + info->var.xres > info->var.xres_virtual ||
 726             yoffset + info->var.yres > info->var.yres_virtual)
 727                 return -EINVAL;
 728         if ((err = info->fbops->fb_pan_display(var, info)))
 729                 return err;
 730         info->var.xoffset = var->xoffset;
 731         info->var.yoffset = var->yoffset;
 732         if (var->vmode & FB_VMODE_YWRAP)
 733                 info->var.vmode |= FB_VMODE_YWRAP;
 734         else
 735                 info->var.vmode &= ~FB_VMODE_YWRAP;
 736         return 0;
 737 }
 738
 739 int
 740 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
 741 {
 742         int err, flags = info->flags;
 743
 744         if (var->activate & FB_ACTIVATE_INV_MODE) {
 745                 struct fb_videomode mode1, mode2;
 746                 int ret = 0;
 747
 748                 fb_var_to_videomode(&mode1, var);
 749                 fb_var_to_videomode(&mode2, &info->var);
 750                 /* make sure we don't delete the videomode of current var */
 751                 ret = fb_mode_is_equal(&mode1, &mode2);
 752
 753                 if (!ret) {
 754                     struct fb_event event;
 755
 756                     event.info = info;
 757                     event.data = &mode1;
 758                     ret = notifier_call_chain(&fb_notifier_list,
 759                                               FB_EVENT_MODE_DELETE, &event);
 760                 }
 761
 762                 if (!ret)
 763                     fb_delete_videomode(&mode1, &info->modelist);
 764
 765                 return ret;
 766         }
 767
 768         if ((var->activate & FB_ACTIVATE_FORCE) ||
 769             memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
 770                 if (!info->fbops->fb_check_var) {
 771                         *var = info->var;
 772                         return 0;
 773                 }
 774
 775                 if ((err = info->fbops->fb_check_var(var, info)))
 776                         return err;
 777
 778                 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
 779                         struct fb_videomode mode;
 780                         int err = 0;
 781
 782                         info->var = *var;
 783                         if (info->fbops->fb_set_par)
 784                                 info->fbops->fb_set_par(info);
 785
 786                         fb_pan_display(info, &info->var);
 787
 788                         fb_set_cmap(&info->cmap, info);
 789
 790                         fb_var_to_videomode(&mode, &info->var);
 791
 792                         if (info->modelist.prev && info->modelist.next &&
 793                             !list_empty(&info->modelist))
 794                                 err = fb_add_videomode(&mode, &info->modelist);
 795
 796                         if (!err && (flags & FBINFO_MISC_USEREVENT)) {
 797                                 struct fb_event event;
 798                                 int evnt = (var->activate & FB_ACTIVATE_ALL) ?
 799                                         FB_EVENT_MODE_CHANGE_ALL :
 800                                         FB_EVENT_MODE_CHANGE;
 801
 802                                 info->flags &= ~FBINFO_MISC_USEREVENT;
 803                                 event.info = info;
 804                                 notifier_call_chain(&fb_notifier_list, evnt,
 805                                                     &event);
 806                         }
 807                 }
 808         }
 809         return 0;
 810 }
 811
 812 int
 813 fb_blank(struct fb_info *info, int blank)
 814 {
 815         int ret = -EINVAL;
 816
 817         if (blank > FB_BLANK_POWERDOWN)
 818                 blank = FB_BLANK_POWERDOWN;
 819
 820         if (info->fbops->fb_blank)
 821                 ret = info->fbops->fb_blank(blank, info);
 822
 823         if (!ret) {
 824                 struct fb_event event;
 825
 826                 event.info = info;
 827                 event.data = &blank;
 828                 notifier_call_chain(&fb_notifier_list, FB_EVENT_BLANK, &event);
 829         }
 830
 831         return ret;
 832 }
 833
 834 static int
 835 fb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
 836          unsigned long arg)
 837 {
 838         int fbidx = iminor(inode);
 839         struct fb_info *info = registered_fb[fbidx];
 840         struct fb_ops *fb = info->fbops;
 841         struct fb_var_screeninfo var;
 842         struct fb_fix_screeninfo fix;
 843         struct fb_con2fbmap con2fb;
 844         struct fb_cmap_user cmap;
 845         struct fb_event event;
 846         void __user *argp = (void __user *)arg;
 847         int i;
 848
 849         if (!fb)
 850                 return -ENODEV;
 851         switch (cmd) {
 852         case FBIOGET_VSCREENINFO:
 853                 return copy_to_user(argp, &info->var,
 854                                     sizeof(var)) ? -EFAULT : 0;
 855         case FBIOPUT_VSCREENINFO:
 856                 if (copy_from_user(&var, argp, sizeof(var)))
 857                         return -EFAULT;
 858                 acquire_console_sem();
 859                 info->flags |= FBINFO_MISC_USEREVENT;
 860                 i = fb_set_var(info, &var);
 861                 info->flags &= ~FBINFO_MISC_USEREVENT;
 862                 release_console_sem();
 863                 if (i) return i;
 864                 if (copy_to_user(argp, &var, sizeof(var)))
 865                         return -EFAULT;
 866                 return 0;
 867         case FBIOGET_FSCREENINFO:
 868                 return copy_to_user(argp, &info->fix,
 869                                     sizeof(fix)) ? -EFAULT : 0;
 870         case FBIOPUTCMAP:
 871                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
 872                         return -EFAULT;
 873                 return (fb_set_user_cmap(&cmap, info));
 874         case FBIOGETCMAP:
 875                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
 876                         return -EFAULT;
 877                 return fb_cmap_to_user(&info->cmap, &cmap);
 878         case FBIOPAN_DISPLAY:
 879                 if (copy_from_user(&var, argp, sizeof(var)))
 880                         return -EFAULT;
 881                 acquire_console_sem();
 882                 i = fb_pan_display(info, &var);
 883                 release_console_sem();
 884                 if (i)
 885                         return i;
 886                 if (copy_to_user(argp, &var, sizeof(var)))
 887                         return -EFAULT;
 888                 return 0;
 889         case FBIO_CURSOR:
 890                 return -EINVAL;
 891         case FBIOGET_CON2FBMAP:
 892                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
 893                         return -EFAULT;
 894                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
 895                     return -EINVAL;
 896                 con2fb.framebuffer = -1;
 897                 event.info = info;
 898                 event.data = &con2fb;
 899                 notifier_call_chain(&fb_notifier_list,
 900                                     FB_EVENT_GET_CONSOLE_MAP, &event);
 901                 return copy_to_user(argp, &con2fb,
 902                                     sizeof(con2fb)) ? -EFAULT : 0;
 903         case FBIOPUT_CON2FBMAP:
 904                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
 905                         return - EFAULT;
 906                 if (con2fb.console < 0 || con2fb.console > MAX_NR_CONSOLES)
 907                     return -EINVAL;
 908                 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
 909                     return -EINVAL;
 910 #ifdef CONFIG_KMOD
 911                 if (!registered_fb[con2fb.framebuffer])
 912                     try_to_load(con2fb.framebuffer);
 913 #endif /* CONFIG_KMOD */
 914                 if (!registered_fb[con2fb.framebuffer])
 915                     return -EINVAL;
 916                 event.info = info;
 917                 event.data = &con2fb;
 918                 return notifier_call_chain(&fb_notifier_list,
 919                                            FB_EVENT_SET_CONSOLE_MAP,
 920                                            &event);
 921         case FBIOBLANK:
 922                 acquire_console_sem();
 923                 info->flags |= FBINFO_MISC_USEREVENT;
 924                 i = fb_blank(info, arg);
 925                 info->flags &= ~FBINFO_MISC_USEREVENT;
 926                 release_console_sem();
 927                 return i;
 928         default:
 929                 if (fb->fb_ioctl == NULL)
 930                         return -EINVAL;
 931                 return fb->fb_ioctl(inode, file, cmd, arg, info);
 932         }
 933 }
 934
 935 #ifdef CONFIG_COMPAT
 936 static long
 937 fb_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 938 {
 939         int fbidx = iminor(file->f_dentry->d_inode);
 940         struct fb_info *info = registered_fb[fbidx];
 941         struct fb_ops *fb = info->fbops;
 942         long ret;
 943
 944         if (fb->fb_compat_ioctl == NULL)
 945                 return -ENOIOCTLCMD;
 946         lock_kernel();
 947         ret = fb->fb_compat_ioctl(file, cmd, arg, info);
 948         unlock_kernel();
 949         return ret;
 950 }
 951 #endif
 952
 953 static int
 954 fb_mmap(struct file *file, struct vm_area_struct * vma)
 955 {
 956         int fbidx = iminor(file->f_dentry->d_inode);
 957         struct fb_info *info = registered_fb[fbidx];
 958         struct fb_ops *fb = info->fbops;
 959         unsigned long off;
 960 #if !defined(__sparc__) || defined(__sparc_v9__)
 961         unsigned long start;
 962         u32 len;
 963 #endif
 964
 965         if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
 966                 return -EINVAL;
 967         off = vma->vm_pgoff << PAGE_SHIFT;
 968         if (!fb)
 969                 return -ENODEV;
 970         if (fb->fb_mmap) {
 971                 int res;
 972                 lock_kernel();
 973                 res = fb->fb_mmap(info, file, vma);
 974                 unlock_kernel();
 975                 return res;
 976         }
 977
 978 #if defined(__sparc__) && !defined(__sparc_v9__)
 979         /* Should never get here, all fb drivers should have their own
 980            mmap routines */
 981         return -EINVAL;
 982 #else
 983         /* !sparc32... */
 984         lock_kernel();
 985
 986         /* frame buffer memory */
 987         start = info->fix.smem_start;
 988         len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
 989         if (off >= len) {
 990                 /* memory mapped io */
 991                 off -= len;
 992                 if (info->var.accel_flags) {
 993                         unlock_kernel();
 994                         return -EINVAL;
 995                 }
 996                 start = info->fix.mmio_start;
 997                 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
 998         }
 999         unlock_kernel();
1000         start &= PAGE_MASK;
1001         if ((vma->vm_end - vma->vm_start + off) > len)
1002                 return -EINVAL;
1003         off += start;
1004         vma->vm_pgoff = off >> PAGE_SHIFT;
1005         /* This is an IO map - tell maydump to skip this VMA */
1006         vma->vm_flags |= VM_IO | VM_RESERVED;
1007 #if defined(__sparc_v9__)
1008         if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1009                                 vma->vm_end - vma->vm_start, vma->vm_page_prot))
1010                 return -EAGAIN;
1011 #else
1012 #if defined(__mc68000__)
1013 #if defined(CONFIG_SUN3)
1014         pgprot_val(vma->vm_page_prot) |= SUN3_PAGE_NOCACHE;
1015 #elif defined(CONFIG_MMU)
1016         if (CPU_IS_020_OR_030)
1017                 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE030;
1018         if (CPU_IS_040_OR_060) {
1019                 pgprot_val(vma->vm_page_prot) &= _CACHEMASK040;
1020                 /* Use no-cache mode, serialized */
1021                 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE_S;
1022         }
1023 #endif
1024 #elif defined(__powerpc__)
1025         vma->vm_page_prot = phys_mem_access_prot(file, off >> PAGE_SHIFT,
1026                                                  vma->vm_end - vma->vm_start,
1027                                                  vma->vm_page_prot);
1028 #elif defined(__alpha__)
1029         /* Caching is off in the I/O space quadrant by design.  */
1030 #elif defined(__i386__) || defined(__x86_64__)
1031         if (boot_cpu_data.x86 > 3)
1032                 pgprot_val(vma->vm_page_prot) |= _PAGE_PCD;
1033 #elif defined(__mips__)
1034         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1035 #elif defined(__hppa__)
1036         pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
1037 #elif defined(__arm__) || defined(__sh__) || defined(__m32r__)
1038         vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
1039 #elif defined(__ia64__)
1040         if (efi_range_is_wc(vma->vm_start, vma->vm_end - vma->vm_start))
1041                 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
1042         else
1043                 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1044 #else
1045 #warning What do we have to do here??
1046 #endif
1047         if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1048                              vma->vm_end - vma->vm_start, vma->vm_page_prot))
1049                 return -EAGAIN;
1050 #endif /* !__sparc_v9__ */
1051         return 0;
1052 #endif /* !sparc32 */
1053 }
1054
1055 static int
1056 fb_open(struct inode *inode, struct file *file)
1057 {
1058         int fbidx = iminor(inode);
1059         struct fb_info *info;
1060         int res = 0;
1061
1062         if (fbidx >= FB_MAX)
1063                 return -ENODEV;
1064 #ifdef CONFIG_KMOD
1065         if (!(info = registered_fb[fbidx]))
1066                 try_to_load(fbidx);
1067 #endif /* CONFIG_KMOD */
1068         if (!(info = registered_fb[fbidx]))
1069                 return -ENODEV;
1070         if (!try_module_get(info->fbops->owner))
1071                 return -ENODEV;
1072         if (info->fbops->fb_open) {
1073                 res = info->fbops->fb_open(info,1);
1074                 if (res)
1075                         module_put(info->fbops->owner);
1076         }
1077         return res;
1078 }
1079
1080 static int
1081 fb_release(struct inode *inode, struct file *file)
1082 {
1083         int fbidx = iminor(inode);
1084         struct fb_info *info;
1085
1086         lock_kernel();
1087         info = registered_fb[fbidx];
1088         if (info->fbops->fb_release)
1089                 info->fbops->fb_release(info,1);
1090         module_put(info->fbops->owner);
1091         unlock_kernel();
1092         return 0;
1093 }
1094
1095 static struct file_operations fb_fops = {
1096         .owner =        THIS_MODULE,
1097         .read =         fb_read,
1098         .write =        fb_write,
1099         .ioctl =        fb_ioctl,
1100 #ifdef CONFIG_COMPAT
1101         .compat_ioctl = fb_compat_ioctl,
1102 #endif
1103         .mmap =         fb_mmap,
1104         .open =         fb_open,
1105         .release =      fb_release,
1106 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1107         .get_unmapped_area = get_fb_unmapped_area,
1108 #endif
1109 };
1110
1111 static struct class *fb_class;
1112
1113 /**
1114  *      register_framebuffer - registers a frame buffer device
1115  *      @fb_info: frame buffer info structure
1116  *
1117  *      Registers a frame buffer device @fb_info.
1118  *
1119  *      Returns negative errno on error, or zero for success.
1120  *
1121  */
1122
1123 int
1124 register_framebuffer(struct fb_info *fb_info)
1125 {
1126         int i;
1127         struct fb_event event;
1128         struct fb_videomode mode;
1129
1130         if (num_registered_fb == FB_MAX)
1131                 return -ENXIO;
1132         num_registered_fb++;
1133         for (i = 0 ; i < FB_MAX; i++)
1134                 if (!registered_fb[i])
1135                         break;
1136         fb_info->node = i;
1137
1138         fb_info->class_device = class_device_create(fb_class, NULL, MKDEV(FB_MAJOR, i),
1139                                     fb_info->device, "fb%d", i);
1140         if (IS_ERR(fb_info->class_device)) {
1141                 /* Not fatal */
1142                 printk(KERN_WARNING "Unable to create class_device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->class_device));
1143                 fb_info->class_device = NULL;
1144         } else
1145                 fb_init_class_device(fb_info);
1146
1147         if (fb_info->pixmap.addr == NULL) {
1148                 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1149                 if (fb_info->pixmap.addr) {
1150                         fb_info->pixmap.size = FBPIXMAPSIZE;
1151                         fb_info->pixmap.buf_align = 1;
1152                         fb_info->pixmap.scan_align = 1;
1153                         fb_info->pixmap.access_align = 32;
1154                         fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1155                 }
1156         }
1157         fb_info->pixmap.offset = 0;
1158
1159         if (!fb_info->modelist.prev || !fb_info->modelist.next)
1160                 INIT_LIST_HEAD(&fb_info->modelist);
1161
1162         fb_var_to_videomode(&mode, &fb_info->var);
1163         fb_add_videomode(&mode, &fb_info->modelist);
1164         registered_fb[i] = fb_info;
1165
1166         devfs_mk_cdev(MKDEV(FB_MAJOR, i),
1167                         S_IFCHR | S_IRUGO | S_IWUGO, "fb/%d", i);
1168         event.info = fb_info;
1169         notifier_call_chain(&fb_notifier_list,
1170                             FB_EVENT_FB_REGISTERED, &event);
1171         return 0;
1172 }
1173
1174
1175 /**
1176  *      unregister_framebuffer - releases a frame buffer device
1177  *      @fb_info: frame buffer info structure
1178  *
1179  *      Unregisters a frame buffer device @fb_info.
1180  *
1181  *      Returns negative errno on error, or zero for success.
1182  *
1183  */
1184
1185 int
1186 unregister_framebuffer(struct fb_info *fb_info)
1187 {
1188         int i;
1189
1190         i = fb_info->node;
1191         if (!registered_fb[i])
1192                 return -EINVAL;
1193         devfs_remove("fb/%d", i);
1194
1195         if (fb_info->pixmap.addr && (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1196                 kfree(fb_info->pixmap.addr);
1197         fb_destroy_modelist(&fb_info->modelist);
1198         registered_fb[i]=NULL;
1199         num_registered_fb--;
1200         fb_cleanup_class_device(fb_info);
1201         class_device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1202         return 0;
1203 }
1204
1205 /**
1206  *      fb_register_client - register a client notifier
1207  *      @nb: notifier block to callback on events
1208  */
1209 int fb_register_client(struct notifier_block *nb)
1210 {
1211         return notifier_chain_register(&fb_notifier_list, nb);
1212 }
1213
1214 /**
1215  *      fb_unregister_client - unregister a client notifier
1216  *      @nb: notifier block to callback on events
1217  */
1218 int fb_unregister_client(struct notifier_block *nb)
1219 {
1220         return notifier_chain_unregister(&fb_notifier_list, nb);
1221 }
1222
1223 /**
1224  *      fb_set_suspend - low level driver signals suspend
1225  *      @info: framebuffer affected
1226  *      @state: 0 = resuming, !=0 = suspending
1227  *
1228  *      This is meant to be used by low level drivers to
1229  *      signal suspend/resume to the core & clients.
1230  *      It must be called with the console semaphore held
1231  */
1232 void fb_set_suspend(struct fb_info *info, int state)
1233 {
1234         struct fb_event event;
1235
1236         event.info = info;
1237         if (state) {
1238                 notifier_call_chain(&fb_notifier_list, FB_EVENT_SUSPEND, &event);
1239                 info->state = FBINFO_STATE_SUSPENDED;
1240         } else {
1241                 info->state = FBINFO_STATE_RUNNING;
1242                 notifier_call_chain(&fb_notifier_list, FB_EVENT_RESUME, &event);
1243         }
1244 }
1245
1246 /**
1247  *      fbmem_init - init frame buffer subsystem
1248  *
1249  *      Initialize the frame buffer subsystem.
1250  *
1251  *      NOTE: This function is _only_ to be called by drivers/char/mem.c.
1252  *
1253  */
1254
1255 static int __init
1256 fbmem_init(void)
1257 {
1258         create_proc_read_entry("fb", 0, NULL, fbmem_read_proc, NULL);
1259
1260         devfs_mk_dir("fb");
1261         if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1262                 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1263
1264         fb_class = class_create(THIS_MODULE, "graphics");
1265         if (IS_ERR(fb_class)) {
1266                 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1267                 fb_class = NULL;
1268         }
1269         return 0;
1270 }
1271
1272 #ifdef MODULE
1273 module_init(fbmem_init);
1274 static void __exit
1275 fbmem_exit(void)
1276 {
1277         class_destroy(fb_class);
1278         unregister_chrdev(FB_MAJOR, "fb");
1279 }
1280
1281 module_exit(fbmem_exit);
1282 MODULE_LICENSE("GPL");
1283 MODULE_DESCRIPTION("Framebuffer base");
1284 #else
1285 subsys_initcall(fbmem_init);
1286 #endif
1287
1288 int fb_new_modelist(struct fb_info *info)
1289 {
1290         struct fb_event event;
1291         struct fb_var_screeninfo var = info->var;
1292         struct list_head *pos, *n;
1293         struct fb_modelist *modelist;
1294         struct fb_videomode *m, mode;
1295         int err = 1;
1296
1297         list_for_each_safe(pos, n, &info->modelist) {
1298                 modelist = list_entry(pos, struct fb_modelist, list);
1299                 m = &modelist->mode;
1300                 fb_videomode_to_var(&var, m);
1301                 var.activate = FB_ACTIVATE_TEST;
1302                 err = fb_set_var(info, &var);
1303                 fb_var_to_videomode(&mode, &var);
1304                 if (err || !fb_mode_is_equal(m, &mode)) {
1305                         list_del(pos);
1306                         kfree(pos);
1307                 }
1308         }
1309
1310         err = 1;
1311
1312         if (!list_empty(&info->modelist)) {
1313                 event.info = info;
1314                 err = notifier_call_chain(&fb_notifier_list,
1315                                            FB_EVENT_NEW_MODELIST,
1316                                            &event);
1317         }
1318
1319         return err;
1320 }
1321
1322 /**
1323  * fb_con_duit - user<->fbcon passthrough
1324  * @info: struct fb_info
1325  * @event: notification event to be passed to fbcon
1326  * @data: private data
1327  *
1328  * DESCRIPTION
1329  * This function is an fbcon-user event passing channel
1330  * which bypasses fbdev.  This is hopefully temporary
1331  * until a user interface for fbcon is created
1332  */
1333 int fb_con_duit(struct fb_info *info, int event, void *data)
1334 {
1335         struct fb_event evnt;
1336
1337         evnt.info = info;
1338         evnt.data = data;
1339
1340         return notifier_call_chain(&fb_notifier_list, event, &evnt);
1341 }
1342 EXPORT_SYMBOL(fb_con_duit);
1343
1344 static char *video_options[FB_MAX];
1345 static int ofonly;
1346
1347 extern const char *global_mode_option;
1348
1349 /**
1350  * fb_get_options - get kernel boot parameters
1351  * @name:   framebuffer name as it would appear in
1352  *          the boot parameter line
1353  *          (video=<name>:<options>)
1354  * @option: the option will be stored here
1355  *
1356  * NOTE: Needed to maintain backwards compatibility
1357  */
1358 int fb_get_options(char *name, char **option)
1359 {
1360         char *opt, *options = NULL;
1361         int opt_len, retval = 0;
1362         int name_len = strlen(name), i;
1363
1364         if (name_len && ofonly && strncmp(name, "offb", 4))
1365                 retval = 1;
1366
1367         if (name_len && !retval) {
1368                 for (i = 0; i < FB_MAX; i++) {
1369                         if (video_options[i] == NULL)
1370                                 continue;
1371                         opt_len = strlen(video_options[i]);
1372                         if (!opt_len)
1373                                 continue;
1374                         opt = video_options[i];
1375                         if (!strncmp(name, opt, name_len) &&
1376                             opt[name_len] == ':')
1377                                 options = opt + name_len + 1;
1378                 }
1379         }
1380         if (options && !strncmp(options, "off", 3))
1381                 retval = 1;
1382
1383         if (option)
1384                 *option = options;
1385
1386         return retval;
1387 }
1388
1389 /**
1390  *      video_setup - process command line options
1391  *      @options: string of options
1392  *
1393  *      Process command line options for frame buffer subsystem.
1394  *
1395  *      NOTE: This function is a __setup and __init function.
1396  *            It only stores the options.  Drivers have to call
1397  *            fb_get_options() as necessary.
1398  *
1399  *      Returns zero.
1400  *
1401  */
1402 static int __init video_setup(char *options)
1403 {
1404         int i, global = 0;
1405
1406         if (!options || !*options)
1407                 global = 1;
1408
1409         if (!global && !strncmp(options, "ofonly", 6)) {
1410                 ofonly = 1;
1411                 global = 1;
1412         }
1413
1414         if (!global && !strstr(options, "fb:")) {
1415                 global_mode_option = options;
1416                 global = 1;
1417         }
1418
1419         if (!global) {
1420                 for (i = 0; i < FB_MAX; i++) {
1421                         if (video_options[i] == NULL) {
1422                                 video_options[i] = options;
1423                                 break;
1424                         }
1425
1426                 }
1427         }
1428
1429         return 0;
1430 }
1431 __setup("video=", video_setup);
1432
1433     /*
1434      *  Visible symbols for modules
1435      */
1436
1437 EXPORT_SYMBOL(register_framebuffer);
1438 EXPORT_SYMBOL(unregister_framebuffer);
1439 EXPORT_SYMBOL(num_registered_fb);
1440 EXPORT_SYMBOL(registered_fb);
1441 EXPORT_SYMBOL(fb_prepare_logo);
1442 EXPORT_SYMBOL(fb_show_logo);
1443 EXPORT_SYMBOL(fb_set_var);
1444 EXPORT_SYMBOL(fb_blank);
1445 EXPORT_SYMBOL(fb_pan_display);
1446 EXPORT_SYMBOL(fb_get_buffer_offset);
1447 EXPORT_SYMBOL(fb_set_suspend);
1448 EXPORT_SYMBOL(fb_register_client);
1449 EXPORT_SYMBOL(fb_unregister_client);
1450 EXPORT_SYMBOL(fb_get_options);
1451 EXPORT_SYMBOL(fb_new_modelist);
1452
1453 MODULE_LICENSE("GPL");