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/module.h>
  15
  16 #include <linux/compat.h>
  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/vt.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/err.h>
  35 #include <linux/device.h>
  36 #include <linux/efi.h>
  37
  38 #if defined(__mc68000__) || defined(CONFIG_APUS)
  39 #include <asm/setup.h>
  40 #endif
  41
  42 #include <asm/io.h>
  43 #include <asm/uaccess.h>
  44 #include <asm/page.h>
  45 #include <asm/pgtable.h>
  46
  47 #include <linux/fb.h>
  48
  49     /*
  50      *  Frame buffer device initialization and setup routines
  51      */
  52
  53 #define FBPIXMAPSIZE    (1024 * 8)
  54
  55 struct fb_info *registered_fb[FB_MAX];
  56 int num_registered_fb;
  57
  58 /*
  59  * Helpers
  60  */
  61
  62 int fb_get_color_depth(struct fb_var_screeninfo *var,
  63                        struct fb_fix_screeninfo *fix)
  64 {
  65         int depth = 0;
  66
  67         if (fix->visual == FB_VISUAL_MONO01 ||
  68             fix->visual == FB_VISUAL_MONO10)
  69                 depth = 1;
  70         else {
  71                 if (var->green.length == var->blue.length &&
  72                     var->green.length == var->red.length &&
  73                     var->green.offset == var->blue.offset &&
  74                     var->green.offset == var->red.offset)
  75                         depth = var->green.length;
  76                 else
  77                         depth = var->green.length + var->red.length +
  78                                 var->blue.length;
  79         }
  80
  81         return depth;
  82 }
  83 EXPORT_SYMBOL(fb_get_color_depth);
  84
  85 /*
  86  * Data padding functions.
  87  */
  88 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
  89 {
  90         __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
  91 }
  92 EXPORT_SYMBOL(fb_pad_aligned_buffer);
  93
  94 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
  95                                 u32 shift_high, u32 shift_low, u32 mod)
  96 {
  97         u8 mask = (u8) (0xfff << shift_high), tmp;
  98         int i, j;
  99
 100         for (i = height; i--; ) {
 101                 for (j = 0; j < idx; j++) {
 102                         tmp = dst[j];
 103                         tmp &= mask;
 104                         tmp |= *src >> shift_low;
 105                         dst[j] = tmp;
 106                         tmp = *src << shift_high;
 107                         dst[j+1] = tmp;
 108                         src++;
 109                 }
 110                 tmp = dst[idx];
 111                 tmp &= mask;
 112                 tmp |= *src >> shift_low;
 113                 dst[idx] = tmp;
 114                 if (shift_high < mod) {
 115                         tmp = *src << shift_high;
 116                         dst[idx+1] = tmp;
 117                 }
 118                 src++;
 119                 dst += d_pitch;
 120         }
 121 }
 122 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
 123
 124 /*
 125  * we need to lock this section since fb_cursor
 126  * may use fb_imageblit()
 127  */
 128 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
 129 {
 130         u32 align = buf->buf_align - 1, offset;
 131         char *addr = buf->addr;
 132
 133         /* If IO mapped, we need to sync before access, no sharing of
 134          * the pixmap is done
 135          */
 136         if (buf->flags & FB_PIXMAP_IO) {
 137                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 138                         info->fbops->fb_sync(info);
 139                 return addr;
 140         }
 141
 142         /* See if we fit in the remaining pixmap space */
 143         offset = buf->offset + align;
 144         offset &= ~align;
 145         if (offset + size > buf->size) {
 146                 /* We do not fit. In order to be able to re-use the buffer,
 147                  * we must ensure no asynchronous DMA'ing or whatever operation
 148                  * is in progress, we sync for that.
 149                  */
 150                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 151                         info->fbops->fb_sync(info);
 152                 offset = 0;
 153         }
 154         buf->offset = offset + size;
 155         addr += offset;
 156
 157         return addr;
 158 }
 159
 160 #ifdef CONFIG_LOGO
 161
 162 static inline unsigned safe_shift(unsigned d, int n)
 163 {
 164         return n < 0 ? d >> -n : d << n;
 165 }
 166
 167 static void fb_set_logocmap(struct fb_info *info,
 168                                    const struct linux_logo *logo)
 169 {
 170         struct fb_cmap palette_cmap;
 171         u16 palette_green[16];
 172         u16 palette_blue[16];
 173         u16 palette_red[16];
 174         int i, j, n;
 175         const unsigned char *clut = logo->clut;
 176
 177         palette_cmap.start = 0;
 178         palette_cmap.len = 16;
 179         palette_cmap.red = palette_red;
 180         palette_cmap.green = palette_green;
 181         palette_cmap.blue = palette_blue;
 182         palette_cmap.transp = NULL;
 183
 184         for (i = 0; i < logo->clutsize; i += n) {
 185                 n = logo->clutsize - i;
 186                 /* palette_cmap provides space for only 16 colors at once */
 187                 if (n > 16)
 188                         n = 16;
 189                 palette_cmap.start = 32 + i;
 190                 palette_cmap.len = n;
 191                 for (j = 0; j < n; ++j) {
 192                         palette_cmap.red[j] = clut[0] << 8 | clut[0];
 193                         palette_cmap.green[j] = clut[1] << 8 | clut[1];
 194                         palette_cmap.blue[j] = clut[2] << 8 | clut[2];
 195                         clut += 3;
 196                 }
 197                 fb_set_cmap(&palette_cmap, info);
 198         }
 199 }
 200
 201 static void  fb_set_logo_truepalette(struct fb_info *info,
 202                                             const struct linux_logo *logo,
 203                                             u32 *palette)
 204 {
 205         unsigned char mask[9] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
 206         unsigned char redmask, greenmask, bluemask;
 207         int redshift, greenshift, blueshift;
 208         int i;
 209         const unsigned char *clut = logo->clut;
 210
 211         /*
 212          * We have to create a temporary palette since console palette is only
 213          * 16 colors long.
 214          */
 215         /* Bug: Doesn't obey msb_right ... (who needs that?) */
 216         redmask   = mask[info->var.red.length   < 8 ? info->var.red.length   : 8];
 217         greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
 218         bluemask  = mask[info->var.blue.length  < 8 ? info->var.blue.length  : 8];
 219         redshift   = info->var.red.offset   - (8 - info->var.red.length);
 220         greenshift = info->var.green.offset - (8 - info->var.green.length);
 221         blueshift  = info->var.blue.offset  - (8 - info->var.blue.length);
 222
 223         for ( i = 0; i < logo->clutsize; i++) {
 224                 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
 225                                  safe_shift((clut[1] & greenmask), greenshift) |
 226                                  safe_shift((clut[2] & bluemask), blueshift));
 227                 clut += 3;
 228         }
 229 }
 230
 231 static void fb_set_logo_directpalette(struct fb_info *info,
 232                                              const struct linux_logo *logo,
 233                                              u32 *palette)
 234 {
 235         int redshift, greenshift, blueshift;
 236         int i;
 237
 238         redshift = info->var.red.offset;
 239         greenshift = info->var.green.offset;
 240         blueshift = info->var.blue.offset;
 241
 242         for (i = 32; i < logo->clutsize; i++)
 243                 palette[i] = i << redshift | i << greenshift | i << blueshift;
 244 }
 245
 246 static void fb_set_logo(struct fb_info *info,
 247                                const struct linux_logo *logo, u8 *dst,
 248                                int depth)
 249 {
 250         int i, j, k;
 251         const u8 *src = logo->data;
 252         u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
 253         u8 fg = 1, d;
 254
 255         if (fb_get_color_depth(&info->var, &info->fix) == 3)
 256                 fg = 7;
 257
 258         if (info->fix.visual == FB_VISUAL_MONO01 ||
 259             info->fix.visual == FB_VISUAL_MONO10)
 260                 fg = ~((u8) (0xfff << info->var.green.length));
 261
 262         switch (depth) {
 263         case 4:
 264                 for (i = 0; i < logo->height; i++)
 265                         for (j = 0; j < logo->width; src++) {
 266                                 *dst++ = *src >> 4;
 267                                 j++;
 268                                 if (j < logo->width) {
 269                                         *dst++ = *src & 0x0f;
 270                                         j++;
 271                                 }
 272                         }
 273                 break;
 274         case 1:
 275                 for (i = 0; i < logo->height; i++) {
 276                         for (j = 0; j < logo->width; src++) {
 277                                 d = *src ^ xor;
 278                                 for (k = 7; k >= 0; k--) {
 279                                         *dst++ = ((d >> k) & 1) ? fg : 0;
 280                                         j++;
 281                                 }
 282                         }
 283                 }
 284                 break;
 285         }
 286 }
 287
 288 /*
 289  * Three (3) kinds of logo maps exist.  linux_logo_clut224 (>16 colors),
 290  * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors).  Depending on
 291  * the visual format and color depth of the framebuffer, the DAC, the
 292  * pseudo_palette, and the logo data will be adjusted accordingly.
 293  *
 294  * Case 1 - linux_logo_clut224:
 295  * Color exceeds the number of console colors (16), thus we set the hardware DAC
 296  * using fb_set_cmap() appropriately.  The "needs_cmapreset"  flag will be set.
 297  *
 298  * For visuals that require color info from the pseudo_palette, we also construct
 299  * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
 300  * will be set.
 301  *
 302  * Case 2 - linux_logo_vga16:
 303  * The number of colors just matches the console colors, thus there is no need
 304  * to set the DAC or the pseudo_palette.  However, the bitmap is packed, ie,
 305  * each byte contains color information for two pixels (upper and lower nibble).
 306  * To be consistent with fb_imageblit() usage, we therefore separate the two
 307  * nibbles into separate bytes. The "depth" flag will be set to 4.
 308  *
 309  * Case 3 - linux_logo_mono:
 310  * This is similar with Case 2.  Each byte contains information for 8 pixels.
 311  * We isolate each bit and expand each into a byte. The "depth" flag will
 312  * be set to 1.
 313  */
 314 static struct logo_data {
 315         int depth;
 316         int needs_directpalette;
 317         int needs_truepalette;
 318         int needs_cmapreset;
 319         const struct linux_logo *logo;
 320 } fb_logo;
 321
 322 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
 323 {
 324         u32 size = width * height, i;
 325
 326         out += size - 1;
 327
 328         for (i = size; i--; )
 329                 *out-- = *in++;
 330 }
 331
 332 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
 333 {
 334         int i, j, h = height - 1;
 335
 336         for (i = 0; i < height; i++)
 337                 for (j = 0; j < width; j++)
 338                                 out[height * j + h - i] = *in++;
 339 }
 340
 341 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
 342 {
 343         int i, j, w = width - 1;
 344
 345         for (i = 0; i < height; i++)
 346                 for (j = 0; j < width; j++)
 347                         out[height * (w - j) + i] = *in++;
 348 }
 349
 350 static void fb_rotate_logo(struct fb_info *info, u8 *dst,
 351                            struct fb_image *image, int rotate)
 352 {
 353         u32 tmp;
 354
 355         if (rotate == FB_ROTATE_UD) {
 356                 fb_rotate_logo_ud(image->data, dst, image->width,
 357                                   image->height);
 358                 image->dx = info->var.xres - image->width;
 359                 image->dy = info->var.yres - image->height;
 360         } else if (rotate == FB_ROTATE_CW) {
 361                 fb_rotate_logo_cw(image->data, dst, image->width,
 362                                   image->height);
 363                 tmp = image->width;
 364                 image->width = image->height;
 365                 image->height = tmp;
 366                 image->dx = info->var.xres - image->width;
 367         } else if (rotate == FB_ROTATE_CCW) {
 368                 fb_rotate_logo_ccw(image->data, dst, image->width,
 369                                    image->height);
 370                 tmp = image->width;
 371                 image->width = image->height;
 372                 image->height = tmp;
 373                 image->dy = info->var.yres - image->height;
 374         }
 375
 376         image->data = dst;
 377 }
 378
 379 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
 380                             int rotate)
 381 {
 382         int x;
 383
 384         if (rotate == FB_ROTATE_UR) {
 385                 for (x = 0; x < num_online_cpus() &&
 386                              x * (fb_logo.logo->width + 8) <=
 387                              info->var.xres - fb_logo.logo->width; x++) {
 388                         info->fbops->fb_imageblit(info, image);
 389                         image->dx += fb_logo.logo->width + 8;
 390                 }
 391         } else if (rotate == FB_ROTATE_UD) {
 392                 for (x = 0; x < num_online_cpus() &&
 393                              x * (fb_logo.logo->width + 8) <=
 394                              info->var.xres - fb_logo.logo->width; x++) {
 395                         info->fbops->fb_imageblit(info, image);
 396                         image->dx -= fb_logo.logo->width + 8;
 397                 }
 398         } else if (rotate == FB_ROTATE_CW) {
 399                 for (x = 0; x < num_online_cpus() &&
 400                              x * (fb_logo.logo->width + 8) <=
 401                              info->var.yres - fb_logo.logo->width; x++) {
 402                         info->fbops->fb_imageblit(info, image);
 403                         image->dy += fb_logo.logo->width + 8;
 404                 }
 405         } else if (rotate == FB_ROTATE_CCW) {
 406                 for (x = 0; x < num_online_cpus() &&
 407                              x * (fb_logo.logo->width + 8) <=
 408                              info->var.yres - fb_logo.logo->width; x++) {
 409                         info->fbops->fb_imageblit(info, image);
 410                         image->dy -= fb_logo.logo->width + 8;
 411                 }
 412         }
 413 }
 414
 415 int fb_prepare_logo(struct fb_info *info, int rotate)
 416 {
 417         int depth = fb_get_color_depth(&info->var, &info->fix);
 418         int yres;
 419
 420         memset(&fb_logo, 0, sizeof(struct logo_data));
 421
 422         if (info->flags & FBINFO_MISC_TILEBLITTING)
 423                 return 0;
 424
 425         if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
 426                 depth = info->var.blue.length;
 427                 if (info->var.red.length < depth)
 428                         depth = info->var.red.length;
 429                 if (info->var.green.length < depth)
 430                         depth = info->var.green.length;
 431         }
 432
 433         if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) {
 434                 /* assume console colormap */
 435                 depth = 4;
 436         }
 437
 438         if (depth >= 8) {
 439                 switch (info->fix.visual) {
 440                 case FB_VISUAL_TRUECOLOR:
 441                         fb_logo.needs_truepalette = 1;
 442                         break;
 443                 case FB_VISUAL_DIRECTCOLOR:
 444                         fb_logo.needs_directpalette = 1;
 445                         fb_logo.needs_cmapreset = 1;
 446                         break;
 447                 case FB_VISUAL_PSEUDOCOLOR:
 448                         fb_logo.needs_cmapreset = 1;
 449                         break;
 450                 }
 451         }
 452
 453         /* Return if no suitable logo was found */
 454         fb_logo.logo = fb_find_logo(depth);
 455
 456         if (!fb_logo.logo) {
 457                 return 0;
 458         }
 459
 460         if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
 461                 yres = info->var.yres;
 462         else
 463                 yres = info->var.xres;
 464
 465         if (fb_logo.logo->height > yres) {
 466                 fb_logo.logo = NULL;
 467                 return 0;
 468         }
 469
 470         /* What depth we asked for might be different from what we get */
 471         if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
 472                 fb_logo.depth = 8;
 473         else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
 474                 fb_logo.depth = 4;
 475         else
 476                 fb_logo.depth = 1;
 477         return fb_logo.logo->height;
 478 }
 479
 480 int fb_show_logo(struct fb_info *info, int rotate)
 481 {
 482         u32 *palette = NULL, *saved_pseudo_palette = NULL;
 483         unsigned char *logo_new = NULL, *logo_rotate = NULL;
 484         struct fb_image image;
 485
 486         /* Return if the frame buffer is not mapped or suspended */
 487         if (fb_logo.logo == NULL || info->state != FBINFO_STATE_RUNNING)
 488                 return 0;
 489
 490         image.depth = 8;
 491         image.data = fb_logo.logo->data;
 492
 493         if (fb_logo.needs_cmapreset)
 494                 fb_set_logocmap(info, fb_logo.logo);
 495
 496         if (fb_logo.needs_truepalette ||
 497             fb_logo.needs_directpalette) {
 498                 palette = kmalloc(256 * 4, GFP_KERNEL);
 499                 if (palette == NULL)
 500                         return 0;
 501
 502                 if (fb_logo.needs_truepalette)
 503                         fb_set_logo_truepalette(info, fb_logo.logo, palette);
 504                 else
 505                         fb_set_logo_directpalette(info, fb_logo.logo, palette);
 506
 507                 saved_pseudo_palette = info->pseudo_palette;
 508                 info->pseudo_palette = palette;
 509         }
 510
 511         if (fb_logo.depth <= 4) {
 512                 logo_new = kmalloc(fb_logo.logo->width * fb_logo.logo->height,
 513                                    GFP_KERNEL);
 514                 if (logo_new == NULL) {
 515                         kfree(palette);
 516                         if (saved_pseudo_palette)
 517                                 info->pseudo_palette = saved_pseudo_palette;
 518                         return 0;
 519                 }
 520                 image.data = logo_new;
 521                 fb_set_logo(info, fb_logo.logo, logo_new, fb_logo.depth);
 522         }
 523
 524         image.dx = 0;
 525         image.dy = 0;
 526         image.width = fb_logo.logo->width;
 527         image.height = fb_logo.logo->height;
 528
 529         if (rotate) {
 530                 logo_rotate = kmalloc(fb_logo.logo->width *
 531                                       fb_logo.logo->height, GFP_KERNEL);
 532                 if (logo_rotate)
 533                         fb_rotate_logo(info, logo_rotate, &image, rotate);
 534         }
 535
 536         fb_do_show_logo(info, &image, rotate);
 537
 538         kfree(palette);
 539         if (saved_pseudo_palette != NULL)
 540                 info->pseudo_palette = saved_pseudo_palette;
 541         kfree(logo_new);
 542         kfree(logo_rotate);
 543         return fb_logo.logo->height;
 544 }
 545 #else
 546 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
 547 int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
 548 #endif /* CONFIG_LOGO */
 549
 550 static int fbmem_read_proc(char *buf, char **start, off_t offset,
 551                            int len, int *eof, void *private)
 552 {
 553         struct fb_info **fi;
 554         int clen;
 555
 556         clen = 0;
 557         for (fi = registered_fb; fi < &registered_fb[FB_MAX] && clen < 4000;
 558              fi++)
 559                 if (*fi)
 560                         clen += sprintf(buf + clen, "%d %s\n",
 561                                         (*fi)->node,
 562                                         (*fi)->fix.id);
 563         *start = buf + offset;
 564         if (clen > offset)
 565                 clen -= offset;
 566         else
 567                 clen = 0;
 568         return clen < len ? clen : len;
 569 }
 570
 571 static ssize_t
 572 fb_read(struct file *file, 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, *dst;
 579         u32 __iomem *src;
 580         int c, i, cnt = 0, err = 0;
 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_read)
 590                 return info->fbops->fb_read(file, buf, count, ppos);
 591
 592         total_size = info->screen_size;
 593
 594         if (total_size == 0)
 595                 total_size = info->fix.smem_len;
 596
 597         if (p >= total_size)
 598                 return 0;
 599
 600         if (count >= total_size)
 601                 count = total_size;
 602
 603         if (count + p > total_size)
 604                 count = total_size - p;
 605
 606         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 607                          GFP_KERNEL);
 608         if (!buffer)
 609                 return -ENOMEM;
 610
 611         src = (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                 dst = buffer;
 619                 for (i = c >> 2; i--; )
 620                         *dst++ = fb_readl(src++);
 621                 if (c & 3) {
 622                         u8 *dst8 = (u8 *) dst;
 623                         u8 __iomem *src8 = (u8 __iomem *) src;
 624
 625                         for (i = c & 3; i--;)
 626                                 *dst8++ = fb_readb(src8++);
 627
 628                         src = (u32 __iomem *) src8;
 629                 }
 630
 631                 if (copy_to_user(buf, buffer, c)) {
 632                         err = -EFAULT;
 633                         break;
 634                 }
 635                 *ppos += c;
 636                 buf += c;
 637                 cnt += c;
 638                 count -= c;
 639         }
 640
 641         kfree(buffer);
 642
 643         return (err) ? err : cnt;
 644 }
 645
 646 static ssize_t
 647 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 648 {
 649         unsigned long p = *ppos;
 650         struct inode *inode = file->f_dentry->d_inode;
 651         int fbidx = iminor(inode);
 652         struct fb_info *info = registered_fb[fbidx];
 653         u32 *buffer, *src;
 654         u32 __iomem *dst;
 655         int c, i, cnt = 0, err = 0;
 656         unsigned long total_size;
 657
 658         if (!info || !info->screen_base)
 659                 return -ENODEV;
 660
 661         if (info->state != FBINFO_STATE_RUNNING)
 662                 return -EPERM;
 663
 664         if (info->fbops->fb_write)
 665                 return info->fbops->fb_write(file, buf, count, ppos);
 666
 667         total_size = info->screen_size;
 668
 669         if (total_size == 0)
 670                 total_size = info->fix.smem_len;
 671
 672         if (p > total_size)
 673                 return -EFBIG;
 674
 675         if (count > total_size) {
 676                 err = -EFBIG;
 677                 count = total_size;
 678         }
 679
 680         if (count + p > total_size) {
 681                 if (!err)
 682                         err = -ENOSPC;
 683
 684                 count = total_size - p;
 685         }
 686
 687         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 688                          GFP_KERNEL);
 689         if (!buffer)
 690                 return -ENOMEM;
 691
 692         dst = (u32 __iomem *) (info->screen_base + p);
 693
 694         if (info->fbops->fb_sync)
 695                 info->fbops->fb_sync(info);
 696
 697         while (count) {
 698                 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 699                 src = buffer;
 700
 701                 if (copy_from_user(src, buf, c)) {
 702                         err = -EFAULT;
 703                         break;
 704                 }
 705
 706                 for (i = c >> 2; i--; )
 707                         fb_writel(*src++, dst++);
 708
 709                 if (c & 3) {
 710                         u8 *src8 = (u8 *) src;
 711                         u8 __iomem *dst8 = (u8 __iomem *) dst;
 712
 713                         for (i = c & 3; i--; )
 714                                 fb_writeb(*src8++, dst8++);
 715
 716                         dst = (u32 __iomem *) dst8;
 717                 }
 718
 719                 *ppos += c;
 720                 buf += c;
 721                 cnt += c;
 722                 count -= c;
 723         }
 724
 725         kfree(buffer);
 726
 727         return (cnt) ? cnt : err;
 728 }
 729
 730 #ifdef CONFIG_KMOD
 731 static void try_to_load(int fb)
 732 {
 733         request_module("fb%d", fb);
 734 }
 735 #endif /* CONFIG_KMOD */
 736
 737 int
 738 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
 739 {
 740         struct fb_fix_screeninfo *fix = &info->fix;
 741         int xoffset = var->xoffset;
 742         int yoffset = var->yoffset;
 743         int err = 0, yres = info->var.yres;
 744
 745         if (var->yoffset > 0) {
 746                 if (var->vmode & FB_VMODE_YWRAP) {
 747                         if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
 748                                 err = -EINVAL;
 749                         else
 750                                 yres = 0;
 751                 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
 752                         err = -EINVAL;
 753         }
 754
 755         if (var->xoffset > 0 && (!fix->xpanstep ||
 756                                  (var->xoffset % fix->xpanstep)))
 757                 err = -EINVAL;
 758
 759         if (err || !info->fbops->fb_pan_display || xoffset < 0 ||
 760             yoffset < 0 || var->yoffset + yres > info->var.yres_virtual ||
 761             var->xoffset + info->var.xres > info->var.xres_virtual)
 762                 return -EINVAL;
 763
 764         if ((err = info->fbops->fb_pan_display(var, info)))
 765                 return err;
 766         info->var.xoffset = var->xoffset;
 767         info->var.yoffset = var->yoffset;
 768         if (var->vmode & FB_VMODE_YWRAP)
 769                 info->var.vmode |= FB_VMODE_YWRAP;
 770         else
 771                 info->var.vmode &= ~FB_VMODE_YWRAP;
 772         return 0;
 773 }
 774
 775 int
 776 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
 777 {
 778         int err, flags = info->flags;
 779
 780         if (var->activate & FB_ACTIVATE_INV_MODE) {
 781                 struct fb_videomode mode1, mode2;
 782                 int ret = 0;
 783
 784                 fb_var_to_videomode(&mode1, var);
 785                 fb_var_to_videomode(&mode2, &info->var);
 786                 /* make sure we don't delete the videomode of current var */
 787                 ret = fb_mode_is_equal(&mode1, &mode2);
 788
 789                 if (!ret) {
 790                     struct fb_event event;
 791
 792                     event.info = info;
 793                     event.data = &mode1;
 794                     ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event);
 795                 }
 796
 797                 if (!ret)
 798                     fb_delete_videomode(&mode1, &info->modelist);
 799
 800                 return ret;
 801         }
 802
 803         if ((var->activate & FB_ACTIVATE_FORCE) ||
 804             memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
 805                 if (!info->fbops->fb_check_var) {
 806                         *var = info->var;
 807                         return 0;
 808                 }
 809
 810                 if ((err = info->fbops->fb_check_var(var, info)))
 811                         return err;
 812
 813                 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
 814                         struct fb_videomode mode;
 815                         int err = 0;
 816
 817                         info->var = *var;
 818                         if (info->fbops->fb_set_par)
 819                                 info->fbops->fb_set_par(info);
 820
 821                         fb_pan_display(info, &info->var);
 822
 823                         fb_set_cmap(&info->cmap, info);
 824
 825                         fb_var_to_videomode(&mode, &info->var);
 826
 827                         if (info->modelist.prev && info->modelist.next &&
 828                             !list_empty(&info->modelist))
 829                                 err = fb_add_videomode(&mode, &info->modelist);
 830
 831                         if (!err && (flags & FBINFO_MISC_USEREVENT)) {
 832                                 struct fb_event event;
 833                                 int evnt = (var->activate & FB_ACTIVATE_ALL) ?
 834                                         FB_EVENT_MODE_CHANGE_ALL :
 835                                         FB_EVENT_MODE_CHANGE;
 836
 837                                 info->flags &= ~FBINFO_MISC_USEREVENT;
 838                                 event.info = info;
 839                                 fb_notifier_call_chain(evnt, &event);
 840                         }
 841                 }
 842         }
 843         return 0;
 844 }
 845
 846 int
 847 fb_blank(struct fb_info *info, int blank)
 848 {
 849         int ret = -EINVAL;
 850
 851         if (blank > FB_BLANK_POWERDOWN)
 852                 blank = FB_BLANK_POWERDOWN;
 853
 854         if (info->fbops->fb_blank)
 855                 ret = info->fbops->fb_blank(blank, info);
 856
 857         if (!ret) {
 858                 struct fb_event event;
 859
 860                 event.info = info;
 861                 event.data = &blank;
 862                 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
 863         }
 864
 865         return ret;
 866 }
 867
 868 static int
 869 fb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
 870          unsigned long arg)
 871 {
 872         int fbidx = iminor(inode);
 873         struct fb_info *info = registered_fb[fbidx];
 874         struct fb_ops *fb = info->fbops;
 875         struct fb_var_screeninfo var;
 876         struct fb_fix_screeninfo fix;
 877         struct fb_con2fbmap con2fb;
 878         struct fb_cmap_user cmap;
 879         struct fb_event event;
 880         void __user *argp = (void __user *)arg;
 881         int i;
 882
 883         if (!fb)
 884                 return -ENODEV;
 885         switch (cmd) {
 886         case FBIOGET_VSCREENINFO:
 887                 return copy_to_user(argp, &info->var,
 888                                     sizeof(var)) ? -EFAULT : 0;
 889         case FBIOPUT_VSCREENINFO:
 890                 if (copy_from_user(&var, argp, sizeof(var)))
 891                         return -EFAULT;
 892                 acquire_console_sem();
 893                 info->flags |= FBINFO_MISC_USEREVENT;
 894                 i = fb_set_var(info, &var);
 895                 info->flags &= ~FBINFO_MISC_USEREVENT;
 896                 release_console_sem();
 897                 if (i) return i;
 898                 if (copy_to_user(argp, &var, sizeof(var)))
 899                         return -EFAULT;
 900                 return 0;
 901         case FBIOGET_FSCREENINFO:
 902                 return copy_to_user(argp, &info->fix,
 903                                     sizeof(fix)) ? -EFAULT : 0;
 904         case FBIOPUTCMAP:
 905                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
 906                         return -EFAULT;
 907                 return (fb_set_user_cmap(&cmap, info));
 908         case FBIOGETCMAP:
 909                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
 910                         return -EFAULT;
 911                 return fb_cmap_to_user(&info->cmap, &cmap);
 912         case FBIOPAN_DISPLAY:
 913                 if (copy_from_user(&var, argp, sizeof(var)))
 914                         return -EFAULT;
 915                 acquire_console_sem();
 916                 i = fb_pan_display(info, &var);
 917                 release_console_sem();
 918                 if (i)
 919                         return i;
 920                 if (copy_to_user(argp, &var, sizeof(var)))
 921                         return -EFAULT;
 922                 return 0;
 923         case FBIO_CURSOR:
 924                 return -EINVAL;
 925         case FBIOGET_CON2FBMAP:
 926                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
 927                         return -EFAULT;
 928                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
 929                     return -EINVAL;
 930                 con2fb.framebuffer = -1;
 931                 event.info = info;
 932                 event.data = &con2fb;
 933                 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
 934                 return copy_to_user(argp, &con2fb,
 935                                     sizeof(con2fb)) ? -EFAULT : 0;
 936         case FBIOPUT_CON2FBMAP:
 937                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
 938                         return - EFAULT;
 939                 if (con2fb.console < 0 || con2fb.console > MAX_NR_CONSOLES)
 940                     return -EINVAL;
 941                 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
 942                     return -EINVAL;
 943 #ifdef CONFIG_KMOD
 944                 if (!registered_fb[con2fb.framebuffer])
 945                     try_to_load(con2fb.framebuffer);
 946 #endif /* CONFIG_KMOD */
 947                 if (!registered_fb[con2fb.framebuffer])
 948                     return -EINVAL;
 949                 event.info = info;
 950                 event.data = &con2fb;
 951                 return fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP,
 952                                               &event);
 953         case FBIOBLANK:
 954                 acquire_console_sem();
 955                 info->flags |= FBINFO_MISC_USEREVENT;
 956                 i = fb_blank(info, arg);
 957                 info->flags &= ~FBINFO_MISC_USEREVENT;
 958                 release_console_sem();
 959                 return i;
 960         default:
 961                 if (fb->fb_ioctl == NULL)
 962                         return -EINVAL;
 963                 return fb->fb_ioctl(info, cmd, arg);
 964         }
 965 }
 966
 967 #ifdef CONFIG_COMPAT
 968 struct fb_fix_screeninfo32 {
 969         char                    id[16];
 970         compat_caddr_t          smem_start;
 971         u32                     smem_len;
 972         u32                     type;
 973         u32                     type_aux;
 974         u32                     visual;
 975         u16                     xpanstep;
 976         u16                     ypanstep;
 977         u16                     ywrapstep;
 978         u32                     line_length;
 979         compat_caddr_t          mmio_start;
 980         u32                     mmio_len;
 981         u32                     accel;
 982         u16                     reserved[3];
 983 };
 984
 985 struct fb_cmap32 {
 986         u32                     start;
 987         u32                     len;
 988         compat_caddr_t  red;
 989         compat_caddr_t  green;
 990         compat_caddr_t  blue;
 991         compat_caddr_t  transp;
 992 };
 993
 994 static int fb_getput_cmap(struct inode *inode, struct file *file,
 995                         unsigned int cmd, unsigned long arg)
 996 {
 997         struct fb_cmap_user __user *cmap;
 998         struct fb_cmap32 __user *cmap32;
 999         __u32 data;
1000         int err;
1001
1002         cmap = compat_alloc_user_space(sizeof(*cmap));
1003         cmap32 = compat_ptr(arg);
1004
1005         if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1006                 return -EFAULT;
1007
1008         if (get_user(data, &cmap32->red) ||
1009             put_user(compat_ptr(data), &cmap->red) ||
1010             get_user(data, &cmap32->green) ||
1011             put_user(compat_ptr(data), &cmap->green) ||
1012             get_user(data, &cmap32->blue) ||
1013             put_user(compat_ptr(data), &cmap->blue) ||
1014             get_user(data, &cmap32->transp) ||
1015             put_user(compat_ptr(data), &cmap->transp))
1016                 return -EFAULT;
1017
1018         err = fb_ioctl(inode, file, cmd, (unsigned long) cmap);
1019
1020         if (!err) {
1021                 if (copy_in_user(&cmap32->start,
1022                                  &cmap->start,
1023                                  2 * sizeof(__u32)))
1024                         err = -EFAULT;
1025         }
1026         return err;
1027 }
1028
1029 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1030                                   struct fb_fix_screeninfo32 __user *fix32)
1031 {
1032         __u32 data;
1033         int err;
1034
1035         err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1036
1037         data = (__u32) (unsigned long) fix->smem_start;
1038         err |= put_user(data, &fix32->smem_start);
1039
1040         err |= put_user(fix->smem_len, &fix32->smem_len);
1041         err |= put_user(fix->type, &fix32->type);
1042         err |= put_user(fix->type_aux, &fix32->type_aux);
1043         err |= put_user(fix->visual, &fix32->visual);
1044         err |= put_user(fix->xpanstep, &fix32->xpanstep);
1045         err |= put_user(fix->ypanstep, &fix32->ypanstep);
1046         err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1047         err |= put_user(fix->line_length, &fix32->line_length);
1048
1049         data = (__u32) (unsigned long) fix->mmio_start;
1050         err |= put_user(data, &fix32->mmio_start);
1051
1052         err |= put_user(fix->mmio_len, &fix32->mmio_len);
1053         err |= put_user(fix->accel, &fix32->accel);
1054         err |= copy_to_user(fix32->reserved, fix->reserved,
1055                             sizeof(fix->reserved));
1056
1057         return err;
1058 }
1059
1060 static int fb_get_fscreeninfo(struct inode *inode, struct file *file,
1061                                 unsigned int cmd, unsigned long arg)
1062 {
1063         mm_segment_t old_fs;
1064         struct fb_fix_screeninfo fix;
1065         struct fb_fix_screeninfo32 __user *fix32;
1066         int err;
1067
1068         fix32 = compat_ptr(arg);
1069
1070         old_fs = get_fs();
1071         set_fs(KERNEL_DS);
1072         err = fb_ioctl(inode, file, cmd, (unsigned long) &fix);
1073         set_fs(old_fs);
1074
1075         if (!err)
1076                 err = do_fscreeninfo_to_user(&fix, fix32);
1077
1078         return err;
1079 }
1080
1081 static long
1082 fb_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1083 {
1084         struct inode *inode = file->f_dentry->d_inode;
1085         int fbidx = iminor(inode);
1086         struct fb_info *info = registered_fb[fbidx];
1087         struct fb_ops *fb = info->fbops;
1088         long ret = -ENOIOCTLCMD;
1089
1090         lock_kernel();
1091         switch(cmd) {
1092         case FBIOGET_VSCREENINFO:
1093         case FBIOPUT_VSCREENINFO:
1094         case FBIOPAN_DISPLAY:
1095         case FBIOGET_CON2FBMAP:
1096         case FBIOPUT_CON2FBMAP:
1097                 arg = (unsigned long) compat_ptr(arg);
1098         case FBIOBLANK:
1099                 ret = fb_ioctl(inode, file, cmd, arg);
1100                 break;
1101
1102         case FBIOGET_FSCREENINFO:
1103                 ret = fb_get_fscreeninfo(inode, file, cmd, arg);
1104                 break;
1105
1106         case FBIOGETCMAP:
1107         case FBIOPUTCMAP:
1108                 ret = fb_getput_cmap(inode, file, cmd, arg);
1109                 break;
1110
1111         default:
1112                 if (fb->fb_compat_ioctl)
1113                         ret = fb->fb_compat_ioctl(info, cmd, arg);
1114                 break;
1115         }
1116         unlock_kernel();
1117         return ret;
1118 }
1119 #endif
1120
1121 static int
1122 fb_mmap(struct file *file, struct vm_area_struct * vma)
1123 {
1124         int fbidx = iminor(file->f_dentry->d_inode);
1125         struct fb_info *info = registered_fb[fbidx];
1126         struct fb_ops *fb = info->fbops;
1127         unsigned long off;
1128 #if !defined(__sparc__) || defined(__sparc_v9__)
1129         unsigned long start;
1130         u32 len;
1131 #endif
1132
1133         if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
1134                 return -EINVAL;
1135         off = vma->vm_pgoff << PAGE_SHIFT;
1136         if (!fb)
1137                 return -ENODEV;
1138         if (fb->fb_mmap) {
1139                 int res;
1140                 lock_kernel();
1141                 res = fb->fb_mmap(info, vma);
1142                 unlock_kernel();
1143                 return res;
1144         }
1145
1146 #if defined(__sparc__) && !defined(__sparc_v9__)
1147         /* Should never get here, all fb drivers should have their own
1148            mmap routines */
1149         return -EINVAL;
1150 #else
1151         /* !sparc32... */
1152         lock_kernel();
1153
1154         /* frame buffer memory */
1155         start = info->fix.smem_start;
1156         len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
1157         if (off >= len) {
1158                 /* memory mapped io */
1159                 off -= len;
1160                 if (info->var.accel_flags) {
1161                         unlock_kernel();
1162                         return -EINVAL;
1163                 }
1164                 start = info->fix.mmio_start;
1165                 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
1166         }
1167         unlock_kernel();
1168         start &= PAGE_MASK;
1169         if ((vma->vm_end - vma->vm_start + off) > len)
1170                 return -EINVAL;
1171         off += start;
1172         vma->vm_pgoff = off >> PAGE_SHIFT;
1173         /* This is an IO map - tell maydump to skip this VMA */
1174         vma->vm_flags |= VM_IO | VM_RESERVED;
1175 #if defined(__mc68000__)
1176 #if defined(CONFIG_SUN3)
1177         pgprot_val(vma->vm_page_prot) |= SUN3_PAGE_NOCACHE;
1178 #elif defined(CONFIG_MMU)
1179         if (CPU_IS_020_OR_030)
1180                 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE030;
1181         if (CPU_IS_040_OR_060) {
1182                 pgprot_val(vma->vm_page_prot) &= _CACHEMASK040;
1183                 /* Use no-cache mode, serialized */
1184                 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE_S;
1185         }
1186 #endif
1187 #elif defined(__powerpc__)
1188         vma->vm_page_prot = phys_mem_access_prot(file, off >> PAGE_SHIFT,
1189                                                  vma->vm_end - vma->vm_start,
1190                                                  vma->vm_page_prot);
1191 #elif defined(__alpha__)
1192         /* Caching is off in the I/O space quadrant by design.  */
1193 #elif defined(__i386__) || defined(__x86_64__)
1194         if (boot_cpu_data.x86 > 3)
1195                 pgprot_val(vma->vm_page_prot) |= _PAGE_PCD;
1196 #elif defined(__mips__) || defined(__sparc_v9__)
1197         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1198 #elif defined(__hppa__)
1199         pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
1200 #elif defined(__arm__) || defined(__sh__) || defined(__m32r__)
1201         vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
1202 #elif defined(__ia64__)
1203         if (efi_range_is_wc(vma->vm_start, vma->vm_end - vma->vm_start))
1204                 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
1205         else
1206                 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1207 #else
1208 #warning What do we have to do here??
1209 #endif
1210         if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1211                              vma->vm_end - vma->vm_start, vma->vm_page_prot))
1212                 return -EAGAIN;
1213         return 0;
1214 #endif /* !sparc32 */
1215 }
1216
1217 static int
1218 fb_open(struct inode *inode, struct file *file)
1219 {
1220         int fbidx = iminor(inode);
1221         struct fb_info *info;
1222         int res = 0;
1223
1224         if (fbidx >= FB_MAX)
1225                 return -ENODEV;
1226 #ifdef CONFIG_KMOD
1227         if (!(info = registered_fb[fbidx]))
1228                 try_to_load(fbidx);
1229 #endif /* CONFIG_KMOD */
1230         if (!(info = registered_fb[fbidx]))
1231                 return -ENODEV;
1232         if (!try_module_get(info->fbops->owner))
1233                 return -ENODEV;
1234         file->private_data = info;
1235         if (info->fbops->fb_open) {
1236                 res = info->fbops->fb_open(info,1);
1237                 if (res)
1238                         module_put(info->fbops->owner);
1239         }
1240         return res;
1241 }
1242
1243 static int
1244 fb_release(struct inode *inode, struct file *file)
1245 {
1246         struct fb_info * const info = file->private_data;
1247
1248         lock_kernel();
1249         if (info->fbops->fb_release)
1250                 info->fbops->fb_release(info,1);
1251         module_put(info->fbops->owner);
1252         unlock_kernel();
1253         return 0;
1254 }
1255
1256 static struct file_operations fb_fops = {
1257         .owner =        THIS_MODULE,
1258         .read =         fb_read,
1259         .write =        fb_write,
1260         .ioctl =        fb_ioctl,
1261 #ifdef CONFIG_COMPAT
1262         .compat_ioctl = fb_compat_ioctl,
1263 #endif
1264         .mmap =         fb_mmap,
1265         .open =         fb_open,
1266         .release =      fb_release,
1267 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1268         .get_unmapped_area = get_fb_unmapped_area,
1269 #endif
1270 };
1271
1272 struct class *fb_class;
1273 EXPORT_SYMBOL(fb_class);
1274 /**
1275  *      register_framebuffer - registers a frame buffer device
1276  *      @fb_info: frame buffer info structure
1277  *
1278  *      Registers a frame buffer device @fb_info.
1279  *
1280  *      Returns negative errno on error, or zero for success.
1281  *
1282  */
1283
1284 int
1285 register_framebuffer(struct fb_info *fb_info)
1286 {
1287         int i;
1288         struct fb_event event;
1289         struct fb_videomode mode;
1290
1291         if (num_registered_fb == FB_MAX)
1292                 return -ENXIO;
1293         num_registered_fb++;
1294         for (i = 0 ; i < FB_MAX; i++)
1295                 if (!registered_fb[i])
1296                         break;
1297         fb_info->node = i;
1298
1299         fb_info->class_device = class_device_create(fb_class, NULL, MKDEV(FB_MAJOR, i),
1300                                     fb_info->device, "fb%d", i);
1301         if (IS_ERR(fb_info->class_device)) {
1302                 /* Not fatal */
1303                 printk(KERN_WARNING "Unable to create class_device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->class_device));
1304                 fb_info->class_device = NULL;
1305         } else
1306                 fb_init_class_device(fb_info);
1307
1308         if (fb_info->pixmap.addr == NULL) {
1309                 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1310                 if (fb_info->pixmap.addr) {
1311                         fb_info->pixmap.size = FBPIXMAPSIZE;
1312                         fb_info->pixmap.buf_align = 1;
1313                         fb_info->pixmap.scan_align = 1;
1314                         fb_info->pixmap.access_align = 32;
1315                         fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1316                 }
1317         }
1318         fb_info->pixmap.offset = 0;
1319
1320         if (!fb_info->modelist.prev || !fb_info->modelist.next)
1321                 INIT_LIST_HEAD(&fb_info->modelist);
1322
1323         fb_var_to_videomode(&mode, &fb_info->var);
1324         fb_add_videomode(&mode, &fb_info->modelist);
1325         registered_fb[i] = fb_info;
1326
1327         event.info = fb_info;
1328         fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1329         return 0;
1330 }
1331
1332
1333 /**
1334  *      unregister_framebuffer - releases a frame buffer device
1335  *      @fb_info: frame buffer info structure
1336  *
1337  *      Unregisters a frame buffer device @fb_info.
1338  *
1339  *      Returns negative errno on error, or zero for success.
1340  *
1341  */
1342
1343 int
1344 unregister_framebuffer(struct fb_info *fb_info)
1345 {
1346         struct fb_event event;
1347         int i;
1348
1349         i = fb_info->node;
1350         if (!registered_fb[i])
1351                 return -EINVAL;
1352
1353         if (fb_info->pixmap.addr &&
1354             (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1355                 kfree(fb_info->pixmap.addr);
1356         fb_destroy_modelist(&fb_info->modelist);
1357         registered_fb[i]=NULL;
1358         num_registered_fb--;
1359         fb_cleanup_class_device(fb_info);
1360         class_device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1361         event.info = fb_info;
1362         fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1363         return 0;
1364 }
1365
1366 /**
1367  *      fb_set_suspend - low level driver signals suspend
1368  *      @info: framebuffer affected
1369  *      @state: 0 = resuming, !=0 = suspending
1370  *
1371  *      This is meant to be used by low level drivers to
1372  *      signal suspend/resume to the core & clients.
1373  *      It must be called with the console semaphore held
1374  */
1375 void fb_set_suspend(struct fb_info *info, int state)
1376 {
1377         struct fb_event event;
1378
1379         event.info = info;
1380         if (state) {
1381                 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event);
1382                 info->state = FBINFO_STATE_SUSPENDED;
1383         } else {
1384                 info->state = FBINFO_STATE_RUNNING;
1385                 fb_notifier_call_chain(FB_EVENT_RESUME, &event);
1386         }
1387 }
1388
1389 /**
1390  *      fbmem_init - init frame buffer subsystem
1391  *
1392  *      Initialize the frame buffer subsystem.
1393  *
1394  *      NOTE: This function is _only_ to be called by drivers/char/mem.c.
1395  *
1396  */
1397
1398 static int __init
1399 fbmem_init(void)
1400 {
1401         create_proc_read_entry("fb", 0, NULL, fbmem_read_proc, NULL);
1402
1403         if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1404                 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1405
1406         fb_class = class_create(THIS_MODULE, "graphics");
1407         if (IS_ERR(fb_class)) {
1408                 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1409                 fb_class = NULL;
1410         }
1411         return 0;
1412 }
1413
1414 #ifdef MODULE
1415 module_init(fbmem_init);
1416 static void __exit
1417 fbmem_exit(void)
1418 {
1419         class_destroy(fb_class);
1420         unregister_chrdev(FB_MAJOR, "fb");
1421 }
1422
1423 module_exit(fbmem_exit);
1424 MODULE_LICENSE("GPL");
1425 MODULE_DESCRIPTION("Framebuffer base");
1426 #else
1427 subsys_initcall(fbmem_init);
1428 #endif
1429
1430 int fb_new_modelist(struct fb_info *info)
1431 {
1432         struct fb_event event;
1433         struct fb_var_screeninfo var = info->var;
1434         struct list_head *pos, *n;
1435         struct fb_modelist *modelist;
1436         struct fb_videomode *m, mode;
1437         int err = 1;
1438
1439         list_for_each_safe(pos, n, &info->modelist) {
1440                 modelist = list_entry(pos, struct fb_modelist, list);
1441                 m = &modelist->mode;
1442                 fb_videomode_to_var(&var, m);
1443                 var.activate = FB_ACTIVATE_TEST;
1444                 err = fb_set_var(info, &var);
1445                 fb_var_to_videomode(&mode, &var);
1446                 if (err || !fb_mode_is_equal(m, &mode)) {
1447                         list_del(pos);
1448                         kfree(pos);
1449                 }
1450         }
1451
1452         err = 1;
1453
1454         if (!list_empty(&info->modelist)) {
1455                 event.info = info;
1456                 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
1457         }
1458
1459         return err;
1460 }
1461
1462 static char *video_options[FB_MAX];
1463 static int ofonly;
1464
1465 extern const char *global_mode_option;
1466
1467 /**
1468  * fb_get_options - get kernel boot parameters
1469  * @name:   framebuffer name as it would appear in
1470  *          the boot parameter line
1471  *          (video=<name>:<options>)
1472  * @option: the option will be stored here
1473  *
1474  * NOTE: Needed to maintain backwards compatibility
1475  */
1476 int fb_get_options(char *name, char **option)
1477 {
1478         char *opt, *options = NULL;
1479         int opt_len, retval = 0;
1480         int name_len = strlen(name), i;
1481
1482         if (name_len && ofonly && strncmp(name, "offb", 4))
1483                 retval = 1;
1484
1485         if (name_len && !retval) {
1486                 for (i = 0; i < FB_MAX; i++) {
1487                         if (video_options[i] == NULL)
1488                                 continue;
1489                         opt_len = strlen(video_options[i]);
1490                         if (!opt_len)
1491                                 continue;
1492                         opt = video_options[i];
1493                         if (!strncmp(name, opt, name_len) &&
1494                             opt[name_len] == ':')
1495                                 options = opt + name_len + 1;
1496                 }
1497         }
1498         if (options && !strncmp(options, "off", 3))
1499                 retval = 1;
1500
1501         if (option)
1502                 *option = options;
1503
1504         return retval;
1505 }
1506
1507 #ifndef MODULE
1508 /**
1509  *      video_setup - process command line options
1510  *      @options: string of options
1511  *
1512  *      Process command line options for frame buffer subsystem.
1513  *
1514  *      NOTE: This function is a __setup and __init function.
1515  *            It only stores the options.  Drivers have to call
1516  *            fb_get_options() as necessary.
1517  *
1518  *      Returns zero.
1519  *
1520  */
1521 static int __init video_setup(char *options)
1522 {
1523         int i, global = 0;
1524
1525         if (!options || !*options)
1526                 global = 1;
1527
1528         if (!global && !strncmp(options, "ofonly", 6)) {
1529                 ofonly = 1;
1530                 global = 1;
1531         }
1532
1533         if (!global && !strstr(options, "fb:")) {
1534                 global_mode_option = options;
1535                 global = 1;
1536         }
1537
1538         if (!global) {
1539                 for (i = 0; i < FB_MAX; i++) {
1540                         if (video_options[i] == NULL) {
1541                                 video_options[i] = options;
1542                                 break;
1543                         }
1544
1545                 }
1546         }
1547
1548         return 1;
1549 }
1550 __setup("video=", video_setup);
1551 #endif
1552
1553     /*
1554      *  Visible symbols for modules
1555      */
1556
1557 EXPORT_SYMBOL(register_framebuffer);
1558 EXPORT_SYMBOL(unregister_framebuffer);
1559 EXPORT_SYMBOL(num_registered_fb);
1560 EXPORT_SYMBOL(registered_fb);
1561 EXPORT_SYMBOL(fb_prepare_logo);
1562 EXPORT_SYMBOL(fb_show_logo);
1563 EXPORT_SYMBOL(fb_set_var);
1564 EXPORT_SYMBOL(fb_blank);
1565 EXPORT_SYMBOL(fb_pan_display);
1566 EXPORT_SYMBOL(fb_get_buffer_offset);
1567 EXPORT_SYMBOL(fb_set_suspend);
1568 EXPORT_SYMBOL(fb_get_options);
1569
1570 MODULE_LICENSE("GPL");