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   1 /*
   2  *  linux/drivers/video/fbmem.c
   3  *
   4  *  Copyright (C) 1994 Martin Schaller
   5  *
   6  *      2001 - Documented with DocBook
   7  *      - Brad Douglas <brad@neruo.com>
   8  *
   9  * This file is subject to the terms and conditions of the GNU General Public
  10  * License.  See the file COPYING in the main directory of this archive
  11  * for more details.
  12  */
  13
  14 #include <linux/config.h>
  15 #include <linux/module.h>
  16
  17 #include <linux/compat.h>
  18 #include <linux/types.h>
  19 #include <linux/errno.h>
  20 #include <linux/sched.h>
  21 #include <linux/smp_lock.h>
  22 #include <linux/kernel.h>
  23 #include <linux/major.h>
  24 #include <linux/slab.h>
  25 #include <linux/mm.h>
  26 #include <linux/mman.h>
  27 #include <linux/tty.h>
  28 #include <linux/init.h>
  29 #include <linux/linux_logo.h>
  30 #include <linux/proc_fs.h>
  31 #include <linux/console.h>
  32 #ifdef CONFIG_KMOD
  33 #include <linux/kmod.h>
  34 #endif
  35 #include <linux/devfs_fs_kernel.h>
  36 #include <linux/err.h>
  37 #include <linux/kernel.h>
  38 #include <linux/device.h>
  39 #include <linux/efi.h>
  40
  41 #if defined(__mc68000__) || defined(CONFIG_APUS)
  42 #include <asm/setup.h>
  43 #endif
  44
  45 #include <asm/io.h>
  46 #include <asm/uaccess.h>
  47 #include <asm/page.h>
  48 #include <asm/pgtable.h>
  49
  50 #include <linux/fb.h>
  51
  52     /*
  53      *  Frame buffer device initialization and setup routines
  54      */
  55
  56 #define FBPIXMAPSIZE    (1024 * 8)
  57
  58 static struct notifier_block *fb_notifier_list;
  59 struct fb_info *registered_fb[FB_MAX];
  60 int num_registered_fb;
  61
  62 /*
  63  * Helpers
  64  */
  65
  66 int fb_get_color_depth(struct fb_var_screeninfo *var,
  67                        struct fb_fix_screeninfo *fix)
  68 {
  69         int depth = 0;
  70
  71         if (fix->visual == FB_VISUAL_MONO01 ||
  72             fix->visual == FB_VISUAL_MONO10)
  73                 depth = 1;
  74         else {
  75                 if (var->green.length == var->blue.length &&
  76                     var->green.length == var->red.length &&
  77                     var->green.offset == var->blue.offset &&
  78                     var->green.offset == var->red.offset)
  79                         depth = var->green.length;
  80                 else
  81                         depth = var->green.length + var->red.length +
  82                                 var->blue.length;
  83         }
  84
  85         return depth;
  86 }
  87 EXPORT_SYMBOL(fb_get_color_depth);
  88
  89 /*
  90  * Data padding functions.
  91  */
  92 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
  93 {
  94         __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
  95 }
  96 EXPORT_SYMBOL(fb_pad_aligned_buffer);
  97
  98 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
  99                                 u32 shift_high, u32 shift_low, u32 mod)
 100 {
 101         u8 mask = (u8) (0xfff << shift_high), tmp;
 102         int i, j;
 103
 104         for (i = height; i--; ) {
 105                 for (j = 0; j < idx; j++) {
 106                         tmp = dst[j];
 107                         tmp &= mask;
 108                         tmp |= *src >> shift_low;
 109                         dst[j] = tmp;
 110                         tmp = *src << shift_high;
 111                         dst[j+1] = tmp;
 112                         src++;
 113                 }
 114                 tmp = dst[idx];
 115                 tmp &= mask;
 116                 tmp |= *src >> shift_low;
 117                 dst[idx] = tmp;
 118                 if (shift_high < mod) {
 119                         tmp = *src << shift_high;
 120                         dst[idx+1] = tmp;
 121                 }
 122                 src++;
 123                 dst += d_pitch;
 124         }
 125 }
 126 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
 127
 128 /*
 129  * we need to lock this section since fb_cursor
 130  * may use fb_imageblit()
 131  */
 132 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
 133 {
 134         u32 align = buf->buf_align - 1, offset;
 135         char *addr = buf->addr;
 136
 137         /* If IO mapped, we need to sync before access, no sharing of
 138          * the pixmap is done
 139          */
 140         if (buf->flags & FB_PIXMAP_IO) {
 141                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 142                         info->fbops->fb_sync(info);
 143                 return addr;
 144         }
 145
 146         /* See if we fit in the remaining pixmap space */
 147         offset = buf->offset + align;
 148         offset &= ~align;
 149         if (offset + size > buf->size) {
 150                 /* We do not fit. In order to be able to re-use the buffer,
 151                  * we must ensure no asynchronous DMA'ing or whatever operation
 152                  * is in progress, we sync for that.
 153                  */
 154                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 155                         info->fbops->fb_sync(info);
 156                 offset = 0;
 157         }
 158         buf->offset = offset + size;
 159         addr += offset;
 160
 161         return addr;
 162 }
 163
 164 #ifdef CONFIG_LOGO
 165 #include <linux/linux_logo.h>
 166
 167 static inline unsigned safe_shift(unsigned d, int n)
 168 {
 169         return n < 0 ? d >> -n : d << n;
 170 }
 171
 172 static void fb_set_logocmap(struct fb_info *info,
 173                                    const struct linux_logo *logo)
 174 {
 175         struct fb_cmap palette_cmap;
 176         u16 palette_green[16];
 177         u16 palette_blue[16];
 178         u16 palette_red[16];
 179         int i, j, n;
 180         const unsigned char *clut = logo->clut;
 181
 182         palette_cmap.start = 0;
 183         palette_cmap.len = 16;
 184         palette_cmap.red = palette_red;
 185         palette_cmap.green = palette_green;
 186         palette_cmap.blue = palette_blue;
 187         palette_cmap.transp = NULL;
 188
 189         for (i = 0; i < logo->clutsize; i += n) {
 190                 n = logo->clutsize - i;
 191                 /* palette_cmap provides space for only 16 colors at once */
 192                 if (n > 16)
 193                         n = 16;
 194                 palette_cmap.start = 32 + i;
 195                 palette_cmap.len = n;
 196                 for (j = 0; j < n; ++j) {
 197                         palette_cmap.red[j] = clut[0] << 8 | clut[0];
 198                         palette_cmap.green[j] = clut[1] << 8 | clut[1];
 199                         palette_cmap.blue[j] = clut[2] << 8 | clut[2];
 200                         clut += 3;
 201                 }
 202                 fb_set_cmap(&palette_cmap, info);
 203         }
 204 }
 205
 206 static void  fb_set_logo_truepalette(struct fb_info *info,
 207                                             const struct linux_logo *logo,
 208                                             u32 *palette)
 209 {
 210         unsigned char mask[9] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
 211         unsigned char redmask, greenmask, bluemask;
 212         int redshift, greenshift, blueshift;
 213         int i;
 214         const unsigned char *clut = logo->clut;
 215
 216         /*
 217          * We have to create a temporary palette since console palette is only
 218          * 16 colors long.
 219          */
 220         /* Bug: Doesn't obey msb_right ... (who needs that?) */
 221         redmask   = mask[info->var.red.length   < 8 ? info->var.red.length   : 8];
 222         greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
 223         bluemask  = mask[info->var.blue.length  < 8 ? info->var.blue.length  : 8];
 224         redshift   = info->var.red.offset   - (8 - info->var.red.length);
 225         greenshift = info->var.green.offset - (8 - info->var.green.length);
 226         blueshift  = info->var.blue.offset  - (8 - info->var.blue.length);
 227
 228         for ( i = 0; i < logo->clutsize; i++) {
 229                 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
 230                                  safe_shift((clut[1] & greenmask), greenshift) |
 231                                  safe_shift((clut[2] & bluemask), blueshift));
 232                 clut += 3;
 233         }
 234 }
 235
 236 static void fb_set_logo_directpalette(struct fb_info *info,
 237                                              const struct linux_logo *logo,
 238                                              u32 *palette)
 239 {
 240         int redshift, greenshift, blueshift;
 241         int i;
 242
 243         redshift = info->var.red.offset;
 244         greenshift = info->var.green.offset;
 245         blueshift = info->var.blue.offset;
 246
 247         for (i = 32; i < logo->clutsize; i++)
 248                 palette[i] = i << redshift | i << greenshift | i << blueshift;
 249 }
 250
 251 static void fb_set_logo(struct fb_info *info,
 252                                const struct linux_logo *logo, u8 *dst,
 253                                int depth)
 254 {
 255         int i, j, k;
 256         const u8 *src = logo->data;
 257         u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
 258         u8 fg = 1, d;
 259
 260         if (fb_get_color_depth(&info->var, &info->fix) == 3)
 261                 fg = 7;
 262
 263         if (info->fix.visual == FB_VISUAL_MONO01 ||
 264             info->fix.visual == FB_VISUAL_MONO10)
 265                 fg = ~((u8) (0xfff << info->var.green.length));
 266
 267         switch (depth) {
 268         case 4:
 269                 for (i = 0; i < logo->height; i++)
 270                         for (j = 0; j < logo->width; src++) {
 271                                 *dst++ = *src >> 4;
 272                                 j++;
 273                                 if (j < logo->width) {
 274                                         *dst++ = *src & 0x0f;
 275                                         j++;
 276                                 }
 277                         }
 278                 break;
 279         case 1:
 280                 for (i = 0; i < logo->height; i++) {
 281                         for (j = 0; j < logo->width; src++) {
 282                                 d = *src ^ xor;
 283                                 for (k = 7; k >= 0; k--) {
 284                                         *dst++ = ((d >> k) & 1) ? fg : 0;
 285                                         j++;
 286                                 }
 287                         }
 288                 }
 289                 break;
 290         }
 291 }
 292
 293 /*
 294  * Three (3) kinds of logo maps exist.  linux_logo_clut224 (>16 colors),
 295  * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors).  Depending on
 296  * the visual format and color depth of the framebuffer, the DAC, the
 297  * pseudo_palette, and the logo data will be adjusted accordingly.
 298  *
 299  * Case 1 - linux_logo_clut224:
 300  * Color exceeds the number of console colors (16), thus we set the hardware DAC
 301  * using fb_set_cmap() appropriately.  The "needs_cmapreset"  flag will be set.
 302  *
 303  * For visuals that require color info from the pseudo_palette, we also construct
 304  * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
 305  * will be set.
 306  *
 307  * Case 2 - linux_logo_vga16:
 308  * The number of colors just matches the console colors, thus there is no need
 309  * to set the DAC or the pseudo_palette.  However, the bitmap is packed, ie,
 310  * each byte contains color information for two pixels (upper and lower nibble).
 311  * To be consistent with fb_imageblit() usage, we therefore separate the two
 312  * nibbles into separate bytes. The "depth" flag will be set to 4.
 313  *
 314  * Case 3 - linux_logo_mono:
 315  * This is similar with Case 2.  Each byte contains information for 8 pixels.
 316  * We isolate each bit and expand each into a byte. The "depth" flag will
 317  * be set to 1.
 318  */
 319 static struct logo_data {
 320         int depth;
 321         int needs_directpalette;
 322         int needs_truepalette;
 323         int needs_cmapreset;
 324         const struct linux_logo *logo;
 325 } fb_logo;
 326
 327 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
 328 {
 329         u32 size = width * height, i;
 330
 331         out += size - 1;
 332
 333         for (i = size; i--; )
 334                 *out-- = *in++;
 335 }
 336
 337 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
 338 {
 339         int i, j, w = width - 1;
 340
 341         for (i = 0; i < height; i++)
 342                 for (j = 0; j < width; j++)
 343                         out[height * j + w - i] = *in++;
 344 }
 345
 346 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
 347 {
 348         int i, j, w = width - 1;
 349
 350         for (i = 0; i < height; i++)
 351                 for (j = 0; j < width; j++)
 352                         out[height * (w - j) + i] = *in++;
 353 }
 354
 355 static void fb_rotate_logo(struct fb_info *info, u8 *dst,
 356                            struct fb_image *image, int rotate)
 357 {
 358         u32 tmp;
 359
 360         if (rotate == FB_ROTATE_UD) {
 361                 image->dx = info->var.xres - image->width;
 362                 image->dy = info->var.yres - image->height;
 363                 fb_rotate_logo_ud(image->data, dst, image->width,
 364                                   image->height);
 365         } else if (rotate == FB_ROTATE_CW) {
 366                 tmp = image->width;
 367                 image->width = image->height;
 368                 image->height = tmp;
 369                 image->dx = info->var.xres - image->height;
 370                 fb_rotate_logo_cw(image->data, dst, image->width,
 371                                   image->height);
 372         } else if (rotate == FB_ROTATE_CCW) {
 373                 tmp = image->width;
 374                 image->width = image->height;
 375                 image->height = tmp;
 376                 image->dy = info->var.yres - image->width;
 377                 fb_rotate_logo_ccw(image->data, dst, image->width,
 378                                    image->height);
 379         }
 380
 381         image->data = dst;
 382 }
 383
 384 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
 385                             int rotate)
 386 {
 387         int x;
 388
 389         if (rotate == FB_ROTATE_UR) {
 390                 for (x = 0; x < num_online_cpus() &&
 391                              x * (fb_logo.logo->width + 8) <=
 392                              info->var.xres - fb_logo.logo->width; x++) {
 393                         info->fbops->fb_imageblit(info, image);
 394                         image->dx += fb_logo.logo->width + 8;
 395                 }
 396         } else if (rotate == FB_ROTATE_UD) {
 397                 for (x = 0; x < num_online_cpus() &&
 398                              x * (fb_logo.logo->width + 8) <=
 399                              info->var.xres - fb_logo.logo->width; x++) {
 400                         info->fbops->fb_imageblit(info, image);
 401                         image->dx -= fb_logo.logo->width + 8;
 402                 }
 403         } else if (rotate == FB_ROTATE_CW) {
 404                 for (x = 0; x < num_online_cpus() &&
 405                              x * (fb_logo.logo->width + 8) <=
 406                              info->var.yres - fb_logo.logo->width; x++) {
 407                         info->fbops->fb_imageblit(info, image);
 408                         image->dy += fb_logo.logo->width + 8;
 409                 }
 410         } else if (rotate == FB_ROTATE_CCW) {
 411                 for (x = 0; x < num_online_cpus() &&
 412                              x * (fb_logo.logo->width + 8) <=
 413                              info->var.yres - fb_logo.logo->width; x++) {
 414                         info->fbops->fb_imageblit(info, image);
 415                         image->dy -= fb_logo.logo->width + 8;
 416                 }
 417         }
 418 }
 419
 420 int fb_prepare_logo(struct fb_info *info, int rotate)
 421 {
 422         int depth = fb_get_color_depth(&info->var, &info->fix);
 423         int yres;
 424
 425         memset(&fb_logo, 0, sizeof(struct logo_data));
 426
 427         if (info->flags & FBINFO_MISC_TILEBLITTING)
 428                 return 0;
 429
 430         if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
 431                 depth = info->var.blue.length;
 432                 if (info->var.red.length < depth)
 433                         depth = info->var.red.length;
 434                 if (info->var.green.length < depth)
 435                         depth = info->var.green.length;
 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] && len < 4000; fi++)
 558                 if (*fi)
 559                         clen += sprintf(buf + clen, "%d %s\n",
 560                                         (*fi)->node,
 561                                         (*fi)->fix.id);
 562         *start = buf + offset;
 563         if (clen > offset)
 564                 clen -= offset;
 565         else
 566                 clen = 0;
 567         return clen < len ? clen : len;
 568 }
 569
 570 static ssize_t
 571 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 572 {
 573         unsigned long p = *ppos;
 574         struct inode *inode = file->f_dentry->d_inode;
 575         int fbidx = iminor(inode);
 576         struct fb_info *info = registered_fb[fbidx];
 577         u32 *buffer, *dst;
 578         u32 __iomem *src;
 579         int c, i, cnt = 0, err = 0;
 580         unsigned long total_size;
 581
 582         if (!info || ! info->screen_base)
 583                 return -ENODEV;
 584
 585         if (info->state != FBINFO_STATE_RUNNING)
 586                 return -EPERM;
 587
 588         if (info->fbops->fb_read)
 589                 return info->fbops->fb_read(file, buf, count, ppos);
 590
 591         total_size = info->screen_size;
 592         if (total_size == 0)
 593                 total_size = info->fix.smem_len;
 594
 595         if (p >= total_size)
 596             return 0;
 597         if (count >= total_size)
 598             count = total_size;
 599         if (count + p > total_size)
 600                 count = total_size - p;
 601
 602         cnt = 0;
 603         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 604                          GFP_KERNEL);
 605         if (!buffer)
 606                 return -ENOMEM;
 607
 608         src = (u32 __iomem *) (info->screen_base + p);
 609
 610         if (info->fbops->fb_sync)
 611                 info->fbops->fb_sync(info);
 612
 613         while (count) {
 614                 c  = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 615                 dst = buffer;
 616                 for (i = c >> 2; i--; )
 617                         *dst++ = fb_readl(src++);
 618                 if (c & 3) {
 619                         u8 *dst8 = (u8 *) dst;
 620                         u8 __iomem *src8 = (u8 __iomem *) src;
 621
 622                         for (i = c & 3; i--;)
 623                                 *dst8++ = fb_readb(src8++);
 624
 625                         src = (u32 __iomem *) src8;
 626                 }
 627
 628                 if (copy_to_user(buf, buffer, c)) {
 629                         err = -EFAULT;
 630                         break;
 631                 }
 632                 *ppos += c;
 633                 buf += c;
 634                 cnt += c;
 635                 count -= c;
 636         }
 637
 638         kfree(buffer);
 639         return (err) ? err : cnt;
 640 }
 641
 642 static ssize_t
 643 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 644 {
 645         unsigned long p = *ppos;
 646         struct inode *inode = file->f_dentry->d_inode;
 647         int fbidx = iminor(inode);
 648         struct fb_info *info = registered_fb[fbidx];
 649         u32 *buffer, *src;
 650         u32 __iomem *dst;
 651         int c, i, cnt = 0, err;
 652         unsigned long total_size;
 653
 654         if (!info || !info->screen_base)
 655                 return -ENODEV;
 656
 657         if (info->state != FBINFO_STATE_RUNNING)
 658                 return -EPERM;
 659
 660         if (info->fbops->fb_write)
 661                 return info->fbops->fb_write(file, buf, count, ppos);
 662
 663         total_size = info->screen_size;
 664         if (total_size == 0)
 665                 total_size = info->fix.smem_len;
 666
 667         if (p > total_size)
 668             return -ENOSPC;
 669         if (count >= total_size)
 670             count = total_size;
 671         err = 0;
 672         if (count + p > total_size) {
 673             count = total_size - p;
 674             err = -ENOSPC;
 675         }
 676         cnt = 0;
 677         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 678                          GFP_KERNEL);
 679         if (!buffer)
 680                 return -ENOMEM;
 681
 682         dst = (u32 __iomem *) (info->screen_base + p);
 683
 684         if (info->fbops->fb_sync)
 685                 info->fbops->fb_sync(info);
 686
 687         while (count) {
 688                 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 689                 src = buffer;
 690                 if (copy_from_user(src, buf, c)) {
 691                         err = -EFAULT;
 692                         break;
 693                 }
 694                 for (i = c >> 2; i--; )
 695                         fb_writel(*src++, dst++);
 696                 if (c & 3) {
 697                         u8 *src8 = (u8 *) src;
 698                         u8 __iomem *dst8 = (u8 __iomem *) dst;
 699
 700                         for (i = c & 3; i--; )
 701                                 fb_writeb(*src8++, dst8++);
 702
 703                         dst = (u32 __iomem *) dst8;
 704                 }
 705                 *ppos += c;
 706                 buf += c;
 707                 cnt += c;
 708                 count -= c;
 709         }
 710         kfree(buffer);
 711
 712         return (err) ? err : cnt;
 713 }
 714
 715 #ifdef CONFIG_KMOD
 716 static void try_to_load(int fb)
 717 {
 718         request_module("fb%d", fb);
 719 }
 720 #endif /* CONFIG_KMOD */
 721
 722 int
 723 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
 724 {
 725         struct fb_fix_screeninfo *fix = &info->fix;
 726         int xoffset = var->xoffset;
 727         int yoffset = var->yoffset;
 728         int err = 0, yres = info->var.yres;
 729
 730         if (var->yoffset > 0) {
 731                 if (var->vmode & FB_VMODE_YWRAP) {
 732                         if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
 733                                 err = -EINVAL;
 734                         else
 735                                 yres = 0;
 736                 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
 737                         err = -EINVAL;
 738         }
 739
 740         if (var->xoffset > 0 && (!fix->xpanstep ||
 741                                  (var->xoffset % fix->xpanstep)))
 742                 err = -EINVAL;
 743
 744         if (err || !info->fbops->fb_pan_display || xoffset < 0 ||
 745             yoffset < 0 || var->yoffset + yres > info->var.yres_virtual ||
 746             var->xoffset + info->var.xres > info->var.xres_virtual)
 747                 return -EINVAL;
 748
 749         if ((err = info->fbops->fb_pan_display(var, info)))
 750                 return err;
 751         info->var.xoffset = var->xoffset;
 752         info->var.yoffset = var->yoffset;
 753         if (var->vmode & FB_VMODE_YWRAP)
 754                 info->var.vmode |= FB_VMODE_YWRAP;
 755         else
 756                 info->var.vmode &= ~FB_VMODE_YWRAP;
 757         return 0;
 758 }
 759
 760 int
 761 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
 762 {
 763         int err, flags = info->flags;
 764
 765         if (var->activate & FB_ACTIVATE_INV_MODE) {
 766                 struct fb_videomode mode1, mode2;
 767                 int ret = 0;
 768
 769                 fb_var_to_videomode(&mode1, var);
 770                 fb_var_to_videomode(&mode2, &info->var);
 771                 /* make sure we don't delete the videomode of current var */
 772                 ret = fb_mode_is_equal(&mode1, &mode2);
 773
 774                 if (!ret) {
 775                     struct fb_event event;
 776
 777                     event.info = info;
 778                     event.data = &mode1;
 779                     ret = notifier_call_chain(&fb_notifier_list,
 780                                               FB_EVENT_MODE_DELETE, &event);
 781                 }
 782
 783                 if (!ret)
 784                     fb_delete_videomode(&mode1, &info->modelist);
 785
 786                 return ret;
 787         }
 788
 789         if ((var->activate & FB_ACTIVATE_FORCE) ||
 790             memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
 791                 if (!info->fbops->fb_check_var) {
 792                         *var = info->var;
 793                         return 0;
 794                 }
 795
 796                 if ((err = info->fbops->fb_check_var(var, info)))
 797                         return err;
 798
 799                 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
 800                         struct fb_videomode mode;
 801                         int err = 0;
 802
 803                         info->var = *var;
 804                         if (info->fbops->fb_set_par)
 805                                 info->fbops->fb_set_par(info);
 806
 807                         fb_pan_display(info, &info->var);
 808
 809                         fb_set_cmap(&info->cmap, info);
 810
 811                         fb_var_to_videomode(&mode, &info->var);
 812
 813                         if (info->modelist.prev && info->modelist.next &&
 814                             !list_empty(&info->modelist))
 815                                 err = fb_add_videomode(&mode, &info->modelist);
 816
 817                         if (!err && (flags & FBINFO_MISC_USEREVENT)) {
 818                                 struct fb_event event;
 819                                 int evnt = (var->activate & FB_ACTIVATE_ALL) ?
 820                                         FB_EVENT_MODE_CHANGE_ALL :
 821                                         FB_EVENT_MODE_CHANGE;
 822
 823                                 info->flags &= ~FBINFO_MISC_USEREVENT;
 824                                 event.info = info;
 825                                 notifier_call_chain(&fb_notifier_list, evnt,
 826                                                     &event);
 827                         }
 828                 }
 829         }
 830         return 0;
 831 }
 832
 833 int
 834 fb_blank(struct fb_info *info, int blank)
 835 {
 836         int ret = -EINVAL;
 837
 838         if (blank > FB_BLANK_POWERDOWN)
 839                 blank = FB_BLANK_POWERDOWN;
 840
 841         if (info->fbops->fb_blank)
 842                 ret = info->fbops->fb_blank(blank, info);
 843
 844         if (!ret) {
 845                 struct fb_event event;
 846
 847                 event.info = info;
 848                 event.data = &blank;
 849                 notifier_call_chain(&fb_notifier_list, FB_EVENT_BLANK, &event);
 850         }
 851
 852         return ret;
 853 }
 854
 855 static int
 856 fb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
 857          unsigned long arg)
 858 {
 859         int fbidx = iminor(inode);
 860         struct fb_info *info = registered_fb[fbidx];
 861         struct fb_ops *fb = info->fbops;
 862         struct fb_var_screeninfo var;
 863         struct fb_fix_screeninfo fix;
 864         struct fb_con2fbmap con2fb;
 865         struct fb_cmap_user cmap;
 866         struct fb_event event;
 867         void __user *argp = (void __user *)arg;
 868         int i;
 869
 870         if (!fb)
 871                 return -ENODEV;
 872         switch (cmd) {
 873         case FBIOGET_VSCREENINFO:
 874                 return copy_to_user(argp, &info->var,
 875                                     sizeof(var)) ? -EFAULT : 0;
 876         case FBIOPUT_VSCREENINFO:
 877                 if (copy_from_user(&var, argp, sizeof(var)))
 878                         return -EFAULT;
 879                 acquire_console_sem();
 880                 info->flags |= FBINFO_MISC_USEREVENT;
 881                 i = fb_set_var(info, &var);
 882                 info->flags &= ~FBINFO_MISC_USEREVENT;
 883                 release_console_sem();
 884                 if (i) return i;
 885                 if (copy_to_user(argp, &var, sizeof(var)))
 886                         return -EFAULT;
 887                 return 0;
 888         case FBIOGET_FSCREENINFO:
 889                 return copy_to_user(argp, &info->fix,
 890                                     sizeof(fix)) ? -EFAULT : 0;
 891         case FBIOPUTCMAP:
 892                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
 893                         return -EFAULT;
 894                 return (fb_set_user_cmap(&cmap, info));
 895         case FBIOGETCMAP:
 896                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
 897                         return -EFAULT;
 898                 return fb_cmap_to_user(&info->cmap, &cmap);
 899         case FBIOPAN_DISPLAY:
 900                 if (copy_from_user(&var, argp, sizeof(var)))
 901                         return -EFAULT;
 902                 acquire_console_sem();
 903                 i = fb_pan_display(info, &var);
 904                 release_console_sem();
 905                 if (i)
 906                         return i;
 907                 if (copy_to_user(argp, &var, sizeof(var)))
 908                         return -EFAULT;
 909                 return 0;
 910         case FBIO_CURSOR:
 911                 return -EINVAL;
 912         case FBIOGET_CON2FBMAP:
 913                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
 914                         return -EFAULT;
 915                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
 916                     return -EINVAL;
 917                 con2fb.framebuffer = -1;
 918                 event.info = info;
 919                 event.data = &con2fb;
 920                 notifier_call_chain(&fb_notifier_list,
 921                                     FB_EVENT_GET_CONSOLE_MAP, &event);
 922                 return copy_to_user(argp, &con2fb,
 923                                     sizeof(con2fb)) ? -EFAULT : 0;
 924         case FBIOPUT_CON2FBMAP:
 925                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
 926                         return - EFAULT;
 927                 if (con2fb.console < 0 || con2fb.console > MAX_NR_CONSOLES)
 928                     return -EINVAL;
 929                 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
 930                     return -EINVAL;
 931 #ifdef CONFIG_KMOD
 932                 if (!registered_fb[con2fb.framebuffer])
 933                     try_to_load(con2fb.framebuffer);
 934 #endif /* CONFIG_KMOD */
 935                 if (!registered_fb[con2fb.framebuffer])
 936                     return -EINVAL;
 937                 event.info = info;
 938                 event.data = &con2fb;
 939                 return notifier_call_chain(&fb_notifier_list,
 940                                            FB_EVENT_SET_CONSOLE_MAP,
 941                                            &event);
 942         case FBIOBLANK:
 943                 acquire_console_sem();
 944                 info->flags |= FBINFO_MISC_USEREVENT;
 945                 i = fb_blank(info, arg);
 946                 info->flags &= ~FBINFO_MISC_USEREVENT;
 947                 release_console_sem();
 948                 return i;
 949         default:
 950                 if (fb->fb_ioctl == NULL)
 951                         return -EINVAL;
 952                 return fb->fb_ioctl(inode, file, cmd, arg, info);
 953         }
 954 }
 955
 956 #ifdef CONFIG_COMPAT
 957 struct fb_fix_screeninfo32 {
 958         char                    id[16];
 959         compat_caddr_t          smem_start;
 960         u32                     smem_len;
 961         u32                     type;
 962         u32                     type_aux;
 963         u32                     visual;
 964         u16                     xpanstep;
 965         u16                     ypanstep;
 966         u16                     ywrapstep;
 967         u32                     line_length;
 968         compat_caddr_t          mmio_start;
 969         u32                     mmio_len;
 970         u32                     accel;
 971         u16                     reserved[3];
 972 };
 973
 974 struct fb_cmap32 {
 975         u32                     start;
 976         u32                     len;
 977         compat_caddr_t  red;
 978         compat_caddr_t  green;
 979         compat_caddr_t  blue;
 980         compat_caddr_t  transp;
 981 };
 982
 983 static int fb_getput_cmap(struct inode *inode, struct file *file,
 984                         unsigned int cmd, unsigned long arg)
 985 {
 986         struct fb_cmap_user __user *cmap;
 987         struct fb_cmap32 __user *cmap32;
 988         __u32 data;
 989         int err;
 990
 991         cmap = compat_alloc_user_space(sizeof(*cmap));
 992         cmap32 = compat_ptr(arg);
 993
 994         if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
 995                 return -EFAULT;
 996
 997         if (get_user(data, &cmap32->red) ||
 998             put_user(compat_ptr(data), &cmap->red) ||
 999             get_user(data, &cmap32->green) ||
1000             put_user(compat_ptr(data), &cmap->green) ||
1001             get_user(data, &cmap32->blue) ||
1002             put_user(compat_ptr(data), &cmap->blue) ||
1003             get_user(data, &cmap32->transp) ||
1004             put_user(compat_ptr(data), &cmap->transp))
1005                 return -EFAULT;
1006
1007         err = fb_ioctl(inode, file, cmd, (unsigned long) cmap);
1008
1009         if (!err) {
1010                 if (copy_in_user(&cmap32->start,
1011                                  &cmap->start,
1012                                  2 * sizeof(__u32)))
1013                         err = -EFAULT;
1014         }
1015         return err;
1016 }
1017
1018 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1019                                   struct fb_fix_screeninfo32 __user *fix32)
1020 {
1021         __u32 data;
1022         int err;
1023
1024         err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1025
1026         data = (__u32) (unsigned long) fix->smem_start;
1027         err |= put_user(data, &fix32->smem_start);
1028
1029         err |= put_user(fix->smem_len, &fix32->smem_len);
1030         err |= put_user(fix->type, &fix32->type);
1031         err |= put_user(fix->type_aux, &fix32->type_aux);
1032         err |= put_user(fix->visual, &fix32->visual);
1033         err |= put_user(fix->xpanstep, &fix32->xpanstep);
1034         err |= put_user(fix->ypanstep, &fix32->ypanstep);
1035         err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1036         err |= put_user(fix->line_length, &fix32->line_length);
1037
1038         data = (__u32) (unsigned long) fix->mmio_start;
1039         err |= put_user(data, &fix32->mmio_start);
1040
1041         err |= put_user(fix->mmio_len, &fix32->mmio_len);
1042         err |= put_user(fix->accel, &fix32->accel);
1043         err |= copy_to_user(fix32->reserved, fix->reserved,
1044                             sizeof(fix->reserved));
1045
1046         return err;
1047 }
1048
1049 static int fb_get_fscreeninfo(struct inode *inode, struct file *file,
1050                                 unsigned int cmd, unsigned long arg)
1051 {
1052         mm_segment_t old_fs;
1053         struct fb_fix_screeninfo fix;
1054         struct fb_fix_screeninfo32 __user *fix32;
1055         int err;
1056
1057         fix32 = compat_ptr(arg);
1058
1059         old_fs = get_fs();
1060         set_fs(KERNEL_DS);
1061         err = fb_ioctl(inode, file, cmd, (unsigned long) &fix);
1062         set_fs(old_fs);
1063
1064         if (!err)
1065                 err = do_fscreeninfo_to_user(&fix, fix32);
1066
1067         return err;
1068 }
1069
1070 static long
1071 fb_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1072 {
1073         struct inode *inode = file->f_dentry->d_inode;
1074         int fbidx = iminor(inode);
1075         struct fb_info *info = registered_fb[fbidx];
1076         struct fb_ops *fb = info->fbops;
1077         long ret = -ENOIOCTLCMD;
1078
1079         lock_kernel();
1080         switch(cmd) {
1081         case FBIOGET_VSCREENINFO:
1082         case FBIOPUT_VSCREENINFO:
1083         case FBIOPAN_DISPLAY:
1084         case FBIOGET_CON2FBMAP:
1085         case FBIOPUT_CON2FBMAP:
1086                 arg = (unsigned long) compat_ptr(arg);
1087         case FBIOBLANK:
1088                 ret = fb_ioctl(inode, file, cmd, arg);
1089                 break;
1090
1091         case FBIOGET_FSCREENINFO:
1092                 ret = fb_get_fscreeninfo(inode, file, cmd, arg);
1093                 break;
1094
1095         case FBIOGETCMAP:
1096         case FBIOPUTCMAP:
1097                 ret = fb_getput_cmap(inode, file, cmd, arg);
1098                 break;
1099
1100         default:
1101                 if (fb->fb_compat_ioctl)
1102                         ret = fb->fb_compat_ioctl(file, cmd, arg, info);
1103                 break;
1104         }
1105         unlock_kernel();
1106         return ret;
1107 }
1108 #endif
1109
1110 static int
1111 fb_mmap(struct file *file, struct vm_area_struct * vma)
1112 {
1113         int fbidx = iminor(file->f_dentry->d_inode);
1114         struct fb_info *info = registered_fb[fbidx];
1115         struct fb_ops *fb = info->fbops;
1116         unsigned long off;
1117 #if !defined(__sparc__) || defined(__sparc_v9__)
1118         unsigned long start;
1119         u32 len;
1120 #endif
1121
1122         if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
1123                 return -EINVAL;
1124         off = vma->vm_pgoff << PAGE_SHIFT;
1125         if (!fb)
1126                 return -ENODEV;
1127         if (fb->fb_mmap) {
1128                 int res;
1129                 lock_kernel();
1130                 res = fb->fb_mmap(info, file, vma);
1131                 unlock_kernel();
1132                 return res;
1133         }
1134
1135 #if defined(__sparc__) && !defined(__sparc_v9__)
1136         /* Should never get here, all fb drivers should have their own
1137            mmap routines */
1138         return -EINVAL;
1139 #else
1140         /* !sparc32... */
1141         lock_kernel();
1142
1143         /* frame buffer memory */
1144         start = info->fix.smem_start;
1145         len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
1146         if (off >= len) {
1147                 /* memory mapped io */
1148                 off -= len;
1149                 if (info->var.accel_flags) {
1150                         unlock_kernel();
1151                         return -EINVAL;
1152                 }
1153                 start = info->fix.mmio_start;
1154                 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
1155         }
1156         unlock_kernel();
1157         start &= PAGE_MASK;
1158         if ((vma->vm_end - vma->vm_start + off) > len)
1159                 return -EINVAL;
1160         off += start;
1161         vma->vm_pgoff = off >> PAGE_SHIFT;
1162         /* This is an IO map - tell maydump to skip this VMA */
1163         vma->vm_flags |= VM_IO | VM_RESERVED;
1164 #if defined(__sparc_v9__)
1165         if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1166                                 vma->vm_end - vma->vm_start, vma->vm_page_prot))
1167                 return -EAGAIN;
1168 #else
1169 #if defined(__mc68000__)
1170 #if defined(CONFIG_SUN3)
1171         pgprot_val(vma->vm_page_prot) |= SUN3_PAGE_NOCACHE;
1172 #elif defined(CONFIG_MMU)
1173         if (CPU_IS_020_OR_030)
1174                 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE030;
1175         if (CPU_IS_040_OR_060) {
1176                 pgprot_val(vma->vm_page_prot) &= _CACHEMASK040;
1177                 /* Use no-cache mode, serialized */
1178                 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE_S;
1179         }
1180 #endif
1181 #elif defined(__powerpc__)
1182         vma->vm_page_prot = phys_mem_access_prot(file, off >> PAGE_SHIFT,
1183                                                  vma->vm_end - vma->vm_start,
1184                                                  vma->vm_page_prot);
1185 #elif defined(__alpha__)
1186         /* Caching is off in the I/O space quadrant by design.  */
1187 #elif defined(__i386__) || defined(__x86_64__)
1188         if (boot_cpu_data.x86 > 3)
1189                 pgprot_val(vma->vm_page_prot) |= _PAGE_PCD;
1190 #elif defined(__mips__)
1191         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1192 #elif defined(__hppa__)
1193         pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
1194 #elif defined(__arm__) || defined(__sh__) || defined(__m32r__)
1195         vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
1196 #elif defined(__ia64__)
1197         if (efi_range_is_wc(vma->vm_start, vma->vm_end - vma->vm_start))
1198                 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
1199         else
1200                 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1201 #else
1202 #warning What do we have to do here??
1203 #endif
1204         if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1205                              vma->vm_end - vma->vm_start, vma->vm_page_prot))
1206                 return -EAGAIN;
1207 #endif /* !__sparc_v9__ */
1208         return 0;
1209 #endif /* !sparc32 */
1210 }
1211
1212 static int
1213 fb_open(struct inode *inode, struct file *file)
1214 {
1215         int fbidx = iminor(inode);
1216         struct fb_info *info;
1217         int res = 0;
1218
1219         if (fbidx >= FB_MAX)
1220                 return -ENODEV;
1221 #ifdef CONFIG_KMOD
1222         if (!(info = registered_fb[fbidx]))
1223                 try_to_load(fbidx);
1224 #endif /* CONFIG_KMOD */
1225         if (!(info = registered_fb[fbidx]))
1226                 return -ENODEV;
1227         if (!try_module_get(info->fbops->owner))
1228                 return -ENODEV;
1229         if (info->fbops->fb_open) {
1230                 res = info->fbops->fb_open(info,1);
1231                 if (res)
1232                         module_put(info->fbops->owner);
1233         }
1234         return res;
1235 }
1236
1237 static int
1238 fb_release(struct inode *inode, struct file *file)
1239 {
1240         int fbidx = iminor(inode);
1241         struct fb_info *info;
1242
1243         lock_kernel();
1244         info = registered_fb[fbidx];
1245         if (info->fbops->fb_release)
1246                 info->fbops->fb_release(info,1);
1247         module_put(info->fbops->owner);
1248         unlock_kernel();
1249         return 0;
1250 }
1251
1252 static struct file_operations fb_fops = {
1253         .owner =        THIS_MODULE,
1254         .read =         fb_read,
1255         .write =        fb_write,
1256         .ioctl =        fb_ioctl,
1257 #ifdef CONFIG_COMPAT
1258         .compat_ioctl = fb_compat_ioctl,
1259 #endif
1260         .mmap =         fb_mmap,
1261         .open =         fb_open,
1262         .release =      fb_release,
1263 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1264         .get_unmapped_area = get_fb_unmapped_area,
1265 #endif
1266 };
1267
1268 static struct class *fb_class;
1269
1270 /**
1271  *      register_framebuffer - registers a frame buffer device
1272  *      @fb_info: frame buffer info structure
1273  *
1274  *      Registers a frame buffer device @fb_info.
1275  *
1276  *      Returns negative errno on error, or zero for success.
1277  *
1278  */
1279
1280 int
1281 register_framebuffer(struct fb_info *fb_info)
1282 {
1283         int i;
1284         struct fb_event event;
1285         struct fb_videomode mode;
1286
1287         if (num_registered_fb == FB_MAX)
1288                 return -ENXIO;
1289         num_registered_fb++;
1290         for (i = 0 ; i < FB_MAX; i++)
1291                 if (!registered_fb[i])
1292                         break;
1293         fb_info->node = i;
1294
1295         fb_info->class_device = class_device_create(fb_class, NULL, MKDEV(FB_MAJOR, i),
1296                                     fb_info->device, "fb%d", i);
1297         if (IS_ERR(fb_info->class_device)) {
1298                 /* Not fatal */
1299                 printk(KERN_WARNING "Unable to create class_device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->class_device));
1300                 fb_info->class_device = NULL;
1301         } else
1302                 fb_init_class_device(fb_info);
1303
1304         if (fb_info->pixmap.addr == NULL) {
1305                 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1306                 if (fb_info->pixmap.addr) {
1307                         fb_info->pixmap.size = FBPIXMAPSIZE;
1308                         fb_info->pixmap.buf_align = 1;
1309                         fb_info->pixmap.scan_align = 1;
1310                         fb_info->pixmap.access_align = 32;
1311                         fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1312                 }
1313         }
1314         fb_info->pixmap.offset = 0;
1315
1316         if (!fb_info->modelist.prev || !fb_info->modelist.next)
1317                 INIT_LIST_HEAD(&fb_info->modelist);
1318
1319         fb_var_to_videomode(&mode, &fb_info->var);
1320         fb_add_videomode(&mode, &fb_info->modelist);
1321         registered_fb[i] = fb_info;
1322
1323         devfs_mk_cdev(MKDEV(FB_MAJOR, i),
1324                         S_IFCHR | S_IRUGO | S_IWUGO, "fb/%d", i);
1325         event.info = fb_info;
1326         notifier_call_chain(&fb_notifier_list,
1327                             FB_EVENT_FB_REGISTERED, &event);
1328         return 0;
1329 }
1330
1331
1332 /**
1333  *      unregister_framebuffer - releases a frame buffer device
1334  *      @fb_info: frame buffer info structure
1335  *
1336  *      Unregisters a frame buffer device @fb_info.
1337  *
1338  *      Returns negative errno on error, or zero for success.
1339  *
1340  */
1341
1342 int
1343 unregister_framebuffer(struct fb_info *fb_info)
1344 {
1345         int i;
1346
1347         i = fb_info->node;
1348         if (!registered_fb[i])
1349                 return -EINVAL;
1350         devfs_remove("fb/%d", i);
1351
1352         if (fb_info->pixmap.addr && (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1353                 kfree(fb_info->pixmap.addr);
1354         fb_destroy_modelist(&fb_info->modelist);
1355         registered_fb[i]=NULL;
1356         num_registered_fb--;
1357         fb_cleanup_class_device(fb_info);
1358         class_device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1359         return 0;
1360 }
1361
1362 /**
1363  *      fb_register_client - register a client notifier
1364  *      @nb: notifier block to callback on events
1365  */
1366 int fb_register_client(struct notifier_block *nb)
1367 {
1368         return notifier_chain_register(&fb_notifier_list, nb);
1369 }
1370
1371 /**
1372  *      fb_unregister_client - unregister a client notifier
1373  *      @nb: notifier block to callback on events
1374  */
1375 int fb_unregister_client(struct notifier_block *nb)
1376 {
1377         return notifier_chain_unregister(&fb_notifier_list, nb);
1378 }
1379
1380 /**
1381  *      fb_set_suspend - low level driver signals suspend
1382  *      @info: framebuffer affected
1383  *      @state: 0 = resuming, !=0 = suspending
1384  *
1385  *      This is meant to be used by low level drivers to
1386  *      signal suspend/resume to the core & clients.
1387  *      It must be called with the console semaphore held
1388  */
1389 void fb_set_suspend(struct fb_info *info, int state)
1390 {
1391         struct fb_event event;
1392
1393         event.info = info;
1394         if (state) {
1395                 notifier_call_chain(&fb_notifier_list, FB_EVENT_SUSPEND, &event);
1396                 info->state = FBINFO_STATE_SUSPENDED;
1397         } else {
1398                 info->state = FBINFO_STATE_RUNNING;
1399                 notifier_call_chain(&fb_notifier_list, FB_EVENT_RESUME, &event);
1400         }
1401 }
1402
1403 /**
1404  *      fbmem_init - init frame buffer subsystem
1405  *
1406  *      Initialize the frame buffer subsystem.
1407  *
1408  *      NOTE: This function is _only_ to be called by drivers/char/mem.c.
1409  *
1410  */
1411
1412 static int __init
1413 fbmem_init(void)
1414 {
1415         create_proc_read_entry("fb", 0, NULL, fbmem_read_proc, NULL);
1416
1417         devfs_mk_dir("fb");
1418         if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1419                 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1420
1421         fb_class = class_create(THIS_MODULE, "graphics");
1422         if (IS_ERR(fb_class)) {
1423                 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1424                 fb_class = NULL;
1425         }
1426         return 0;
1427 }
1428
1429 #ifdef MODULE
1430 module_init(fbmem_init);
1431 static void __exit
1432 fbmem_exit(void)
1433 {
1434         class_destroy(fb_class);
1435         unregister_chrdev(FB_MAJOR, "fb");
1436 }
1437
1438 module_exit(fbmem_exit);
1439 MODULE_LICENSE("GPL");
1440 MODULE_DESCRIPTION("Framebuffer base");
1441 #else
1442 subsys_initcall(fbmem_init);
1443 #endif
1444
1445 int fb_new_modelist(struct fb_info *info)
1446 {
1447         struct fb_event event;
1448         struct fb_var_screeninfo var = info->var;
1449         struct list_head *pos, *n;
1450         struct fb_modelist *modelist;
1451         struct fb_videomode *m, mode;
1452         int err = 1;
1453
1454         list_for_each_safe(pos, n, &info->modelist) {
1455                 modelist = list_entry(pos, struct fb_modelist, list);
1456                 m = &modelist->mode;
1457                 fb_videomode_to_var(&var, m);
1458                 var.activate = FB_ACTIVATE_TEST;
1459                 err = fb_set_var(info, &var);
1460                 fb_var_to_videomode(&mode, &var);
1461                 if (err || !fb_mode_is_equal(m, &mode)) {
1462                         list_del(pos);
1463                         kfree(pos);
1464                 }
1465         }
1466
1467         err = 1;
1468
1469         if (!list_empty(&info->modelist)) {
1470                 event.info = info;
1471                 err = notifier_call_chain(&fb_notifier_list,
1472                                            FB_EVENT_NEW_MODELIST,
1473                                            &event);
1474         }
1475
1476         return err;
1477 }
1478
1479 /**
1480  * fb_con_duit - user<->fbcon passthrough
1481  * @info: struct fb_info
1482  * @event: notification event to be passed to fbcon
1483  * @data: private data
1484  *
1485  * DESCRIPTION
1486  * This function is an fbcon-user event passing channel
1487  * which bypasses fbdev.  This is hopefully temporary
1488  * until a user interface for fbcon is created
1489  */
1490 int fb_con_duit(struct fb_info *info, int event, void *data)
1491 {
1492         struct fb_event evnt;
1493
1494         evnt.info = info;
1495         evnt.data = data;
1496
1497         return notifier_call_chain(&fb_notifier_list, event, &evnt);
1498 }
1499 EXPORT_SYMBOL(fb_con_duit);
1500
1501 static char *video_options[FB_MAX];
1502 static int ofonly;
1503
1504 extern const char *global_mode_option;
1505
1506 /**
1507  * fb_get_options - get kernel boot parameters
1508  * @name:   framebuffer name as it would appear in
1509  *          the boot parameter line
1510  *          (video=<name>:<options>)
1511  * @option: the option will be stored here
1512  *
1513  * NOTE: Needed to maintain backwards compatibility
1514  */
1515 int fb_get_options(char *name, char **option)
1516 {
1517         char *opt, *options = NULL;
1518         int opt_len, retval = 0;
1519         int name_len = strlen(name), i;
1520
1521         if (name_len && ofonly && strncmp(name, "offb", 4))
1522                 retval = 1;
1523
1524         if (name_len && !retval) {
1525                 for (i = 0; i < FB_MAX; i++) {
1526                         if (video_options[i] == NULL)
1527                                 continue;
1528                         opt_len = strlen(video_options[i]);
1529                         if (!opt_len)
1530                                 continue;
1531                         opt = video_options[i];
1532                         if (!strncmp(name, opt, name_len) &&
1533                             opt[name_len] == ':')
1534                                 options = opt + name_len + 1;
1535                 }
1536         }
1537         if (options && !strncmp(options, "off", 3))
1538                 retval = 1;
1539
1540         if (option)
1541                 *option = options;
1542
1543         return retval;
1544 }
1545
1546 /**
1547  *      video_setup - process command line options
1548  *      @options: string of options
1549  *
1550  *      Process command line options for frame buffer subsystem.
1551  *
1552  *      NOTE: This function is a __setup and __init function.
1553  *            It only stores the options.  Drivers have to call
1554  *            fb_get_options() as necessary.
1555  *
1556  *      Returns zero.
1557  *
1558  */
1559 static int __init video_setup(char *options)
1560 {
1561         int i, global = 0;
1562
1563         if (!options || !*options)
1564                 global = 1;
1565
1566         if (!global && !strncmp(options, "ofonly", 6)) {
1567                 ofonly = 1;
1568                 global = 1;
1569         }
1570
1571         if (!global && !strstr(options, "fb:")) {
1572                 global_mode_option = options;
1573                 global = 1;
1574         }
1575
1576         if (!global) {
1577                 for (i = 0; i < FB_MAX; i++) {
1578                         if (video_options[i] == NULL) {
1579                                 video_options[i] = options;
1580                                 break;
1581                         }
1582
1583                 }
1584         }
1585
1586         return 0;
1587 }
1588 __setup("video=", video_setup);
1589
1590     /*
1591      *  Visible symbols for modules
1592      */
1593
1594 EXPORT_SYMBOL(register_framebuffer);
1595 EXPORT_SYMBOL(unregister_framebuffer);
1596 EXPORT_SYMBOL(num_registered_fb);
1597 EXPORT_SYMBOL(registered_fb);
1598 EXPORT_SYMBOL(fb_prepare_logo);
1599 EXPORT_SYMBOL(fb_show_logo);
1600 EXPORT_SYMBOL(fb_set_var);
1601 EXPORT_SYMBOL(fb_blank);
1602 EXPORT_SYMBOL(fb_pan_display);
1603 EXPORT_SYMBOL(fb_get_buffer_offset);
1604 EXPORT_SYMBOL(fb_set_suspend);
1605 EXPORT_SYMBOL(fb_register_client);
1606 EXPORT_SYMBOL(fb_unregister_client);
1607 EXPORT_SYMBOL(fb_get_options);
1608 EXPORT_SYMBOL(fb_new_modelist);
1609
1610 MODULE_LICENSE("GPL");