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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
 593         if (total_size == 0)
 594                 total_size = info->fix.smem_len;
 595
 596         if (p >= total_size)
 597                 return 0;
 598
 599         if (count >= total_size)
 600                 count = total_size;
 601
 602         if (count + p > total_size)
 603                 count = total_size - p;
 604
 605         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 606                          GFP_KERNEL);
 607         if (!buffer)
 608                 return -ENOMEM;
 609
 610         src = (u32 __iomem *) (info->screen_base + p);
 611
 612         if (info->fbops->fb_sync)
 613                 info->fbops->fb_sync(info);
 614
 615         while (count) {
 616                 c  = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 617                 dst = buffer;
 618                 for (i = c >> 2; i--; )
 619                         *dst++ = fb_readl(src++);
 620                 if (c & 3) {
 621                         u8 *dst8 = (u8 *) dst;
 622                         u8 __iomem *src8 = (u8 __iomem *) src;
 623
 624                         for (i = c & 3; i--;)
 625                                 *dst8++ = fb_readb(src8++);
 626
 627                         src = (u32 __iomem *) src8;
 628                 }
 629
 630                 if (copy_to_user(buf, buffer, c)) {
 631                         err = -EFAULT;
 632                         break;
 633                 }
 634                 *ppos += c;
 635                 buf += c;
 636                 cnt += c;
 637                 count -= c;
 638         }
 639
 640         kfree(buffer);
 641
 642         return (err) ? err : cnt;
 643 }
 644
 645 static ssize_t
 646 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 647 {
 648         unsigned long p = *ppos;
 649         struct inode *inode = file->f_dentry->d_inode;
 650         int fbidx = iminor(inode);
 651         struct fb_info *info = registered_fb[fbidx];
 652         u32 *buffer, *src;
 653         u32 __iomem *dst;
 654         int c, i, cnt = 0, err = 0;
 655         unsigned long total_size;
 656
 657         if (!info || !info->screen_base)
 658                 return -ENODEV;
 659
 660         if (info->state != FBINFO_STATE_RUNNING)
 661                 return -EPERM;
 662
 663         if (info->fbops->fb_write)
 664                 return info->fbops->fb_write(file, buf, count, ppos);
 665
 666         total_size = info->screen_size;
 667
 668         if (total_size == 0)
 669                 total_size = info->fix.smem_len;
 670
 671         if (p > total_size)
 672                 return 0;
 673
 674         if (count >= total_size)
 675                 count = total_size;
 676
 677         if (count + p > total_size)
 678                 count = total_size - p;
 679
 680         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 681                          GFP_KERNEL);
 682         if (!buffer)
 683                 return -ENOMEM;
 684
 685         dst = (u32 __iomem *) (info->screen_base + p);
 686
 687         if (info->fbops->fb_sync)
 688                 info->fbops->fb_sync(info);
 689
 690         while (count) {
 691                 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 692                 src = buffer;
 693
 694                 if (copy_from_user(src, buf, c)) {
 695                         err = -EFAULT;
 696                         break;
 697                 }
 698
 699                 for (i = c >> 2; i--; )
 700                         fb_writel(*src++, dst++);
 701
 702                 if (c & 3) {
 703                         u8 *src8 = (u8 *) src;
 704                         u8 __iomem *dst8 = (u8 __iomem *) dst;
 705
 706                         for (i = c & 3; i--; )
 707                                 fb_writeb(*src8++, dst8++);
 708
 709                         dst = (u32 __iomem *) dst8;
 710                 }
 711
 712                 *ppos += c;
 713                 buf += c;
 714                 cnt += c;
 715                 count -= c;
 716         }
 717
 718         kfree(buffer);
 719
 720         return (err) ? err : cnt;
 721 }
 722
 723 #ifdef CONFIG_KMOD
 724 static void try_to_load(int fb)
 725 {
 726         request_module("fb%d", fb);
 727 }
 728 #endif /* CONFIG_KMOD */
 729
 730 int
 731 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
 732 {
 733         struct fb_fix_screeninfo *fix = &info->fix;
 734         int xoffset = var->xoffset;
 735         int yoffset = var->yoffset;
 736         int err = 0, yres = info->var.yres;
 737
 738         if (var->yoffset > 0) {
 739                 if (var->vmode & FB_VMODE_YWRAP) {
 740                         if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
 741                                 err = -EINVAL;
 742                         else
 743                                 yres = 0;
 744                 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
 745                         err = -EINVAL;
 746         }
 747
 748         if (var->xoffset > 0 && (!fix->xpanstep ||
 749                                  (var->xoffset % fix->xpanstep)))
 750                 err = -EINVAL;
 751
 752         if (err || !info->fbops->fb_pan_display || xoffset < 0 ||
 753             yoffset < 0 || var->yoffset + yres > info->var.yres_virtual ||
 754             var->xoffset + info->var.xres > info->var.xres_virtual)
 755                 return -EINVAL;
 756
 757         if ((err = info->fbops->fb_pan_display(var, info)))
 758                 return err;
 759         info->var.xoffset = var->xoffset;
 760         info->var.yoffset = var->yoffset;
 761         if (var->vmode & FB_VMODE_YWRAP)
 762                 info->var.vmode |= FB_VMODE_YWRAP;
 763         else
 764                 info->var.vmode &= ~FB_VMODE_YWRAP;
 765         return 0;
 766 }
 767
 768 int
 769 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
 770 {
 771         int err, flags = info->flags;
 772
 773         if (var->activate & FB_ACTIVATE_INV_MODE) {
 774                 struct fb_videomode mode1, mode2;
 775                 int ret = 0;
 776
 777                 fb_var_to_videomode(&mode1, var);
 778                 fb_var_to_videomode(&mode2, &info->var);
 779                 /* make sure we don't delete the videomode of current var */
 780                 ret = fb_mode_is_equal(&mode1, &mode2);
 781
 782                 if (!ret) {
 783                     struct fb_event event;
 784
 785                     event.info = info;
 786                     event.data = &mode1;
 787                     ret = notifier_call_chain(&fb_notifier_list,
 788                                               FB_EVENT_MODE_DELETE, &event);
 789                 }
 790
 791                 if (!ret)
 792                     fb_delete_videomode(&mode1, &info->modelist);
 793
 794                 return ret;
 795         }
 796
 797         if ((var->activate & FB_ACTIVATE_FORCE) ||
 798             memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
 799                 if (!info->fbops->fb_check_var) {
 800                         *var = info->var;
 801                         return 0;
 802                 }
 803
 804                 if ((err = info->fbops->fb_check_var(var, info)))
 805                         return err;
 806
 807                 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
 808                         struct fb_videomode mode;
 809                         int err = 0;
 810
 811                         info->var = *var;
 812                         if (info->fbops->fb_set_par)
 813                                 info->fbops->fb_set_par(info);
 814
 815                         fb_pan_display(info, &info->var);
 816
 817                         fb_set_cmap(&info->cmap, info);
 818
 819                         fb_var_to_videomode(&mode, &info->var);
 820
 821                         if (info->modelist.prev && info->modelist.next &&
 822                             !list_empty(&info->modelist))
 823                                 err = fb_add_videomode(&mode, &info->modelist);
 824
 825                         if (!err && (flags & FBINFO_MISC_USEREVENT)) {
 826                                 struct fb_event event;
 827                                 int evnt = (var->activate & FB_ACTIVATE_ALL) ?
 828                                         FB_EVENT_MODE_CHANGE_ALL :
 829                                         FB_EVENT_MODE_CHANGE;
 830
 831                                 info->flags &= ~FBINFO_MISC_USEREVENT;
 832                                 event.info = info;
 833                                 notifier_call_chain(&fb_notifier_list, evnt,
 834                                                     &event);
 835                         }
 836                 }
 837         }
 838         return 0;
 839 }
 840
 841 int
 842 fb_blank(struct fb_info *info, int blank)
 843 {
 844         int ret = -EINVAL;
 845
 846         if (blank > FB_BLANK_POWERDOWN)
 847                 blank = FB_BLANK_POWERDOWN;
 848
 849         if (info->fbops->fb_blank)
 850                 ret = info->fbops->fb_blank(blank, info);
 851
 852         if (!ret) {
 853                 struct fb_event event;
 854
 855                 event.info = info;
 856                 event.data = &blank;
 857                 notifier_call_chain(&fb_notifier_list, FB_EVENT_BLANK, &event);
 858         }
 859
 860         return ret;
 861 }
 862
 863 static int
 864 fb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
 865          unsigned long arg)
 866 {
 867         int fbidx = iminor(inode);
 868         struct fb_info *info = registered_fb[fbidx];
 869         struct fb_ops *fb = info->fbops;
 870         struct fb_var_screeninfo var;
 871         struct fb_fix_screeninfo fix;
 872         struct fb_con2fbmap con2fb;
 873         struct fb_cmap_user cmap;
 874         struct fb_event event;
 875         void __user *argp = (void __user *)arg;
 876         int i;
 877
 878         if (!fb)
 879                 return -ENODEV;
 880         switch (cmd) {
 881         case FBIOGET_VSCREENINFO:
 882                 return copy_to_user(argp, &info->var,
 883                                     sizeof(var)) ? -EFAULT : 0;
 884         case FBIOPUT_VSCREENINFO:
 885                 if (copy_from_user(&var, argp, sizeof(var)))
 886                         return -EFAULT;
 887                 acquire_console_sem();
 888                 info->flags |= FBINFO_MISC_USEREVENT;
 889                 i = fb_set_var(info, &var);
 890                 info->flags &= ~FBINFO_MISC_USEREVENT;
 891                 release_console_sem();
 892                 if (i) return i;
 893                 if (copy_to_user(argp, &var, sizeof(var)))
 894                         return -EFAULT;
 895                 return 0;
 896         case FBIOGET_FSCREENINFO:
 897                 return copy_to_user(argp, &info->fix,
 898                                     sizeof(fix)) ? -EFAULT : 0;
 899         case FBIOPUTCMAP:
 900                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
 901                         return -EFAULT;
 902                 return (fb_set_user_cmap(&cmap, info));
 903         case FBIOGETCMAP:
 904                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
 905                         return -EFAULT;
 906                 return fb_cmap_to_user(&info->cmap, &cmap);
 907         case FBIOPAN_DISPLAY:
 908                 if (copy_from_user(&var, argp, sizeof(var)))
 909                         return -EFAULT;
 910                 acquire_console_sem();
 911                 i = fb_pan_display(info, &var);
 912                 release_console_sem();
 913                 if (i)
 914                         return i;
 915                 if (copy_to_user(argp, &var, sizeof(var)))
 916                         return -EFAULT;
 917                 return 0;
 918         case FBIO_CURSOR:
 919                 return -EINVAL;
 920         case FBIOGET_CON2FBMAP:
 921                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
 922                         return -EFAULT;
 923                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
 924                     return -EINVAL;
 925                 con2fb.framebuffer = -1;
 926                 event.info = info;
 927                 event.data = &con2fb;
 928                 notifier_call_chain(&fb_notifier_list,
 929                                     FB_EVENT_GET_CONSOLE_MAP, &event);
 930                 return copy_to_user(argp, &con2fb,
 931                                     sizeof(con2fb)) ? -EFAULT : 0;
 932         case FBIOPUT_CON2FBMAP:
 933                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
 934                         return - EFAULT;
 935                 if (con2fb.console < 0 || con2fb.console > MAX_NR_CONSOLES)
 936                     return -EINVAL;
 937                 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
 938                     return -EINVAL;
 939 #ifdef CONFIG_KMOD
 940                 if (!registered_fb[con2fb.framebuffer])
 941                     try_to_load(con2fb.framebuffer);
 942 #endif /* CONFIG_KMOD */
 943                 if (!registered_fb[con2fb.framebuffer])
 944                     return -EINVAL;
 945                 event.info = info;
 946                 event.data = &con2fb;
 947                 return notifier_call_chain(&fb_notifier_list,
 948                                            FB_EVENT_SET_CONSOLE_MAP,
 949                                            &event);
 950         case FBIOBLANK:
 951                 acquire_console_sem();
 952                 info->flags |= FBINFO_MISC_USEREVENT;
 953                 i = fb_blank(info, arg);
 954                 info->flags &= ~FBINFO_MISC_USEREVENT;
 955                 release_console_sem();
 956                 return i;
 957         default:
 958                 if (fb->fb_ioctl == NULL)
 959                         return -EINVAL;
 960                 return fb->fb_ioctl(info, cmd, arg);
 961         }
 962 }
 963
 964 #ifdef CONFIG_COMPAT
 965 struct fb_fix_screeninfo32 {
 966         char                    id[16];
 967         compat_caddr_t          smem_start;
 968         u32                     smem_len;
 969         u32                     type;
 970         u32                     type_aux;
 971         u32                     visual;
 972         u16                     xpanstep;
 973         u16                     ypanstep;
 974         u16                     ywrapstep;
 975         u32                     line_length;
 976         compat_caddr_t          mmio_start;
 977         u32                     mmio_len;
 978         u32                     accel;
 979         u16                     reserved[3];
 980 };
 981
 982 struct fb_cmap32 {
 983         u32                     start;
 984         u32                     len;
 985         compat_caddr_t  red;
 986         compat_caddr_t  green;
 987         compat_caddr_t  blue;
 988         compat_caddr_t  transp;
 989 };
 990
 991 static int fb_getput_cmap(struct inode *inode, struct file *file,
 992                         unsigned int cmd, unsigned long arg)
 993 {
 994         struct fb_cmap_user __user *cmap;
 995         struct fb_cmap32 __user *cmap32;
 996         __u32 data;
 997         int err;
 998
 999         cmap = compat_alloc_user_space(sizeof(*cmap));
1000         cmap32 = compat_ptr(arg);
1001
1002         if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1003                 return -EFAULT;
1004
1005         if (get_user(data, &cmap32->red) ||
1006             put_user(compat_ptr(data), &cmap->red) ||
1007             get_user(data, &cmap32->green) ||
1008             put_user(compat_ptr(data), &cmap->green) ||
1009             get_user(data, &cmap32->blue) ||
1010             put_user(compat_ptr(data), &cmap->blue) ||
1011             get_user(data, &cmap32->transp) ||
1012             put_user(compat_ptr(data), &cmap->transp))
1013                 return -EFAULT;
1014
1015         err = fb_ioctl(inode, file, cmd, (unsigned long) cmap);
1016
1017         if (!err) {
1018                 if (copy_in_user(&cmap32->start,
1019                                  &cmap->start,
1020                                  2 * sizeof(__u32)))
1021                         err = -EFAULT;
1022         }
1023         return err;
1024 }
1025
1026 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1027                                   struct fb_fix_screeninfo32 __user *fix32)
1028 {
1029         __u32 data;
1030         int err;
1031
1032         err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1033
1034         data = (__u32) (unsigned long) fix->smem_start;
1035         err |= put_user(data, &fix32->smem_start);
1036
1037         err |= put_user(fix->smem_len, &fix32->smem_len);
1038         err |= put_user(fix->type, &fix32->type);
1039         err |= put_user(fix->type_aux, &fix32->type_aux);
1040         err |= put_user(fix->visual, &fix32->visual);
1041         err |= put_user(fix->xpanstep, &fix32->xpanstep);
1042         err |= put_user(fix->ypanstep, &fix32->ypanstep);
1043         err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1044         err |= put_user(fix->line_length, &fix32->line_length);
1045
1046         data = (__u32) (unsigned long) fix->mmio_start;
1047         err |= put_user(data, &fix32->mmio_start);
1048
1049         err |= put_user(fix->mmio_len, &fix32->mmio_len);
1050         err |= put_user(fix->accel, &fix32->accel);
1051         err |= copy_to_user(fix32->reserved, fix->reserved,
1052                             sizeof(fix->reserved));
1053
1054         return err;
1055 }
1056
1057 static int fb_get_fscreeninfo(struct inode *inode, struct file *file,
1058                                 unsigned int cmd, unsigned long arg)
1059 {
1060         mm_segment_t old_fs;
1061         struct fb_fix_screeninfo fix;
1062         struct fb_fix_screeninfo32 __user *fix32;
1063         int err;
1064
1065         fix32 = compat_ptr(arg);
1066
1067         old_fs = get_fs();
1068         set_fs(KERNEL_DS);
1069         err = fb_ioctl(inode, file, cmd, (unsigned long) &fix);
1070         set_fs(old_fs);
1071
1072         if (!err)
1073                 err = do_fscreeninfo_to_user(&fix, fix32);
1074
1075         return err;
1076 }
1077
1078 static long
1079 fb_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1080 {
1081         struct inode *inode = file->f_dentry->d_inode;
1082         int fbidx = iminor(inode);
1083         struct fb_info *info = registered_fb[fbidx];
1084         struct fb_ops *fb = info->fbops;
1085         long ret = -ENOIOCTLCMD;
1086
1087         lock_kernel();
1088         switch(cmd) {
1089         case FBIOGET_VSCREENINFO:
1090         case FBIOPUT_VSCREENINFO:
1091         case FBIOPAN_DISPLAY:
1092         case FBIOGET_CON2FBMAP:
1093         case FBIOPUT_CON2FBMAP:
1094                 arg = (unsigned long) compat_ptr(arg);
1095         case FBIOBLANK:
1096                 ret = fb_ioctl(inode, file, cmd, arg);
1097                 break;
1098
1099         case FBIOGET_FSCREENINFO:
1100                 ret = fb_get_fscreeninfo(inode, file, cmd, arg);
1101                 break;
1102
1103         case FBIOGETCMAP:
1104         case FBIOPUTCMAP:
1105                 ret = fb_getput_cmap(inode, file, cmd, arg);
1106                 break;
1107
1108         default:
1109                 if (fb->fb_compat_ioctl)
1110                         ret = fb->fb_compat_ioctl(info, cmd, arg);
1111                 break;
1112         }
1113         unlock_kernel();
1114         return ret;
1115 }
1116 #endif
1117
1118 static int
1119 fb_mmap(struct file *file, struct vm_area_struct * vma)
1120 {
1121         int fbidx = iminor(file->f_dentry->d_inode);
1122         struct fb_info *info = registered_fb[fbidx];
1123         struct fb_ops *fb = info->fbops;
1124         unsigned long off;
1125 #if !defined(__sparc__) || defined(__sparc_v9__)
1126         unsigned long start;
1127         u32 len;
1128 #endif
1129
1130         if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
1131                 return -EINVAL;
1132         off = vma->vm_pgoff << PAGE_SHIFT;
1133         if (!fb)
1134                 return -ENODEV;
1135         if (fb->fb_mmap) {
1136                 int res;
1137                 lock_kernel();
1138                 res = fb->fb_mmap(info, vma);
1139                 unlock_kernel();
1140                 return res;
1141         }
1142
1143 #if defined(__sparc__) && !defined(__sparc_v9__)
1144         /* Should never get here, all fb drivers should have their own
1145            mmap routines */
1146         return -EINVAL;
1147 #else
1148         /* !sparc32... */
1149         lock_kernel();
1150
1151         /* frame buffer memory */
1152         start = info->fix.smem_start;
1153         len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
1154         if (off >= len) {
1155                 /* memory mapped io */
1156                 off -= len;
1157                 if (info->var.accel_flags) {
1158                         unlock_kernel();
1159                         return -EINVAL;
1160                 }
1161                 start = info->fix.mmio_start;
1162                 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
1163         }
1164         unlock_kernel();
1165         start &= PAGE_MASK;
1166         if ((vma->vm_end - vma->vm_start + off) > len)
1167                 return -EINVAL;
1168         off += start;
1169         vma->vm_pgoff = off >> PAGE_SHIFT;
1170         /* This is an IO map - tell maydump to skip this VMA */
1171         vma->vm_flags |= VM_IO | VM_RESERVED;
1172 #if defined(__sparc_v9__)
1173         if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1174                                 vma->vm_end - vma->vm_start, vma->vm_page_prot))
1175                 return -EAGAIN;
1176 #else
1177 #if defined(__mc68000__)
1178 #if defined(CONFIG_SUN3)
1179         pgprot_val(vma->vm_page_prot) |= SUN3_PAGE_NOCACHE;
1180 #elif defined(CONFIG_MMU)
1181         if (CPU_IS_020_OR_030)
1182                 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE030;
1183         if (CPU_IS_040_OR_060) {
1184                 pgprot_val(vma->vm_page_prot) &= _CACHEMASK040;
1185                 /* Use no-cache mode, serialized */
1186                 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE_S;
1187         }
1188 #endif
1189 #elif defined(__powerpc__)
1190         vma->vm_page_prot = phys_mem_access_prot(file, off >> PAGE_SHIFT,
1191                                                  vma->vm_end - vma->vm_start,
1192                                                  vma->vm_page_prot);
1193 #elif defined(__alpha__)
1194         /* Caching is off in the I/O space quadrant by design.  */
1195 #elif defined(__i386__) || defined(__x86_64__)
1196         if (boot_cpu_data.x86 > 3)
1197                 pgprot_val(vma->vm_page_prot) |= _PAGE_PCD;
1198 #elif defined(__mips__)
1199         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1200 #elif defined(__hppa__)
1201         pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
1202 #elif defined(__arm__) || defined(__sh__) || defined(__m32r__)
1203         vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
1204 #elif defined(__ia64__)
1205         if (efi_range_is_wc(vma->vm_start, vma->vm_end - vma->vm_start))
1206                 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
1207         else
1208                 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1209 #else
1210 #warning What do we have to do here??
1211 #endif
1212         if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1213                              vma->vm_end - vma->vm_start, vma->vm_page_prot))
1214                 return -EAGAIN;
1215 #endif /* !__sparc_v9__ */
1216         return 0;
1217 #endif /* !sparc32 */
1218 }
1219
1220 static int
1221 fb_open(struct inode *inode, struct file *file)
1222 {
1223         int fbidx = iminor(inode);
1224         struct fb_info *info;
1225         int res = 0;
1226
1227         if (fbidx >= FB_MAX)
1228                 return -ENODEV;
1229 #ifdef CONFIG_KMOD
1230         if (!(info = registered_fb[fbidx]))
1231                 try_to_load(fbidx);
1232 #endif /* CONFIG_KMOD */
1233         if (!(info = registered_fb[fbidx]))
1234                 return -ENODEV;
1235         if (!try_module_get(info->fbops->owner))
1236                 return -ENODEV;
1237         file->private_data = info;
1238         if (info->fbops->fb_open) {
1239                 res = info->fbops->fb_open(info,1);
1240                 if (res)
1241                         module_put(info->fbops->owner);
1242         }
1243         return res;
1244 }
1245
1246 static int
1247 fb_release(struct inode *inode, struct file *file)
1248 {
1249         struct fb_info * const info = file->private_data;
1250
1251         lock_kernel();
1252         if (info->fbops->fb_release)
1253                 info->fbops->fb_release(info,1);
1254         module_put(info->fbops->owner);
1255         unlock_kernel();
1256         return 0;
1257 }
1258
1259 static struct file_operations fb_fops = {
1260         .owner =        THIS_MODULE,
1261         .read =         fb_read,
1262         .write =        fb_write,
1263         .ioctl =        fb_ioctl,
1264 #ifdef CONFIG_COMPAT
1265         .compat_ioctl = fb_compat_ioctl,
1266 #endif
1267         .mmap =         fb_mmap,
1268         .open =         fb_open,
1269         .release =      fb_release,
1270 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1271         .get_unmapped_area = get_fb_unmapped_area,
1272 #endif
1273 };
1274
1275 static struct class *fb_class;
1276
1277 /**
1278  *      register_framebuffer - registers a frame buffer device
1279  *      @fb_info: frame buffer info structure
1280  *
1281  *      Registers a frame buffer device @fb_info.
1282  *
1283  *      Returns negative errno on error, or zero for success.
1284  *
1285  */
1286
1287 int
1288 register_framebuffer(struct fb_info *fb_info)
1289 {
1290         int i;
1291         struct fb_event event;
1292         struct fb_videomode mode;
1293
1294         if (num_registered_fb == FB_MAX)
1295                 return -ENXIO;
1296         num_registered_fb++;
1297         for (i = 0 ; i < FB_MAX; i++)
1298                 if (!registered_fb[i])
1299                         break;
1300         fb_info->node = i;
1301
1302         fb_info->class_device = class_device_create(fb_class, NULL, MKDEV(FB_MAJOR, i),
1303                                     fb_info->device, "fb%d", i);
1304         if (IS_ERR(fb_info->class_device)) {
1305                 /* Not fatal */
1306                 printk(KERN_WARNING "Unable to create class_device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->class_device));
1307                 fb_info->class_device = NULL;
1308         } else
1309                 fb_init_class_device(fb_info);
1310
1311         if (fb_info->pixmap.addr == NULL) {
1312                 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1313                 if (fb_info->pixmap.addr) {
1314                         fb_info->pixmap.size = FBPIXMAPSIZE;
1315                         fb_info->pixmap.buf_align = 1;
1316                         fb_info->pixmap.scan_align = 1;
1317                         fb_info->pixmap.access_align = 32;
1318                         fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1319                 }
1320         }
1321         fb_info->pixmap.offset = 0;
1322
1323         if (!fb_info->modelist.prev || !fb_info->modelist.next)
1324                 INIT_LIST_HEAD(&fb_info->modelist);
1325
1326         fb_var_to_videomode(&mode, &fb_info->var);
1327         fb_add_videomode(&mode, &fb_info->modelist);
1328         registered_fb[i] = fb_info;
1329
1330         devfs_mk_cdev(MKDEV(FB_MAJOR, i),
1331                         S_IFCHR | S_IRUGO | S_IWUGO, "fb/%d", i);
1332         event.info = fb_info;
1333         notifier_call_chain(&fb_notifier_list,
1334                             FB_EVENT_FB_REGISTERED, &event);
1335         return 0;
1336 }
1337
1338
1339 /**
1340  *      unregister_framebuffer - releases a frame buffer device
1341  *      @fb_info: frame buffer info structure
1342  *
1343  *      Unregisters a frame buffer device @fb_info.
1344  *
1345  *      Returns negative errno on error, or zero for success.
1346  *
1347  */
1348
1349 int
1350 unregister_framebuffer(struct fb_info *fb_info)
1351 {
1352         int i;
1353
1354         i = fb_info->node;
1355         if (!registered_fb[i])
1356                 return -EINVAL;
1357         devfs_remove("fb/%d", i);
1358
1359         if (fb_info->pixmap.addr && (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1360                 kfree(fb_info->pixmap.addr);
1361         fb_destroy_modelist(&fb_info->modelist);
1362         registered_fb[i]=NULL;
1363         num_registered_fb--;
1364         fb_cleanup_class_device(fb_info);
1365         class_device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1366         return 0;
1367 }
1368
1369 /**
1370  *      fb_register_client - register a client notifier
1371  *      @nb: notifier block to callback on events
1372  */
1373 int fb_register_client(struct notifier_block *nb)
1374 {
1375         return notifier_chain_register(&fb_notifier_list, nb);
1376 }
1377
1378 /**
1379  *      fb_unregister_client - unregister a client notifier
1380  *      @nb: notifier block to callback on events
1381  */
1382 int fb_unregister_client(struct notifier_block *nb)
1383 {
1384         return notifier_chain_unregister(&fb_notifier_list, nb);
1385 }
1386
1387 /**
1388  *      fb_set_suspend - low level driver signals suspend
1389  *      @info: framebuffer affected
1390  *      @state: 0 = resuming, !=0 = suspending
1391  *
1392  *      This is meant to be used by low level drivers to
1393  *      signal suspend/resume to the core & clients.
1394  *      It must be called with the console semaphore held
1395  */
1396 void fb_set_suspend(struct fb_info *info, int state)
1397 {
1398         struct fb_event event;
1399
1400         event.info = info;
1401         if (state) {
1402                 notifier_call_chain(&fb_notifier_list, FB_EVENT_SUSPEND, &event);
1403                 info->state = FBINFO_STATE_SUSPENDED;
1404         } else {
1405                 info->state = FBINFO_STATE_RUNNING;
1406                 notifier_call_chain(&fb_notifier_list, FB_EVENT_RESUME, &event);
1407         }
1408 }
1409
1410 /**
1411  *      fbmem_init - init frame buffer subsystem
1412  *
1413  *      Initialize the frame buffer subsystem.
1414  *
1415  *      NOTE: This function is _only_ to be called by drivers/char/mem.c.
1416  *
1417  */
1418
1419 static int __init
1420 fbmem_init(void)
1421 {
1422         create_proc_read_entry("fb", 0, NULL, fbmem_read_proc, NULL);
1423
1424         devfs_mk_dir("fb");
1425         if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1426                 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1427
1428         fb_class = class_create(THIS_MODULE, "graphics");
1429         if (IS_ERR(fb_class)) {
1430                 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1431                 fb_class = NULL;
1432         }
1433         return 0;
1434 }
1435
1436 #ifdef MODULE
1437 module_init(fbmem_init);
1438 static void __exit
1439 fbmem_exit(void)
1440 {
1441         class_destroy(fb_class);
1442         unregister_chrdev(FB_MAJOR, "fb");
1443 }
1444
1445 module_exit(fbmem_exit);
1446 MODULE_LICENSE("GPL");
1447 MODULE_DESCRIPTION("Framebuffer base");
1448 #else
1449 subsys_initcall(fbmem_init);
1450 #endif
1451
1452 int fb_new_modelist(struct fb_info *info)
1453 {
1454         struct fb_event event;
1455         struct fb_var_screeninfo var = info->var;
1456         struct list_head *pos, *n;
1457         struct fb_modelist *modelist;
1458         struct fb_videomode *m, mode;
1459         int err = 1;
1460
1461         list_for_each_safe(pos, n, &info->modelist) {
1462                 modelist = list_entry(pos, struct fb_modelist, list);
1463                 m = &modelist->mode;
1464                 fb_videomode_to_var(&var, m);
1465                 var.activate = FB_ACTIVATE_TEST;
1466                 err = fb_set_var(info, &var);
1467                 fb_var_to_videomode(&mode, &var);
1468                 if (err || !fb_mode_is_equal(m, &mode)) {
1469                         list_del(pos);
1470                         kfree(pos);
1471                 }
1472         }
1473
1474         err = 1;
1475
1476         if (!list_empty(&info->modelist)) {
1477                 event.info = info;
1478                 err = notifier_call_chain(&fb_notifier_list,
1479                                            FB_EVENT_NEW_MODELIST,
1480                                            &event);
1481         }
1482
1483         return err;
1484 }
1485
1486 /**
1487  * fb_con_duit - user<->fbcon passthrough
1488  * @info: struct fb_info
1489  * @event: notification event to be passed to fbcon
1490  * @data: private data
1491  *
1492  * DESCRIPTION
1493  * This function is an fbcon-user event passing channel
1494  * which bypasses fbdev.  This is hopefully temporary
1495  * until a user interface for fbcon is created
1496  */
1497 int fb_con_duit(struct fb_info *info, int event, void *data)
1498 {
1499         struct fb_event evnt;
1500
1501         evnt.info = info;
1502         evnt.data = data;
1503
1504         return notifier_call_chain(&fb_notifier_list, event, &evnt);
1505 }
1506 EXPORT_SYMBOL(fb_con_duit);
1507
1508 static char *video_options[FB_MAX];
1509 static int ofonly;
1510
1511 extern const char *global_mode_option;
1512
1513 /**
1514  * fb_get_options - get kernel boot parameters
1515  * @name:   framebuffer name as it would appear in
1516  *          the boot parameter line
1517  *          (video=<name>:<options>)
1518  * @option: the option will be stored here
1519  *
1520  * NOTE: Needed to maintain backwards compatibility
1521  */
1522 int fb_get_options(char *name, char **option)
1523 {
1524         char *opt, *options = NULL;
1525         int opt_len, retval = 0;
1526         int name_len = strlen(name), i;
1527
1528         if (name_len && ofonly && strncmp(name, "offb", 4))
1529                 retval = 1;
1530
1531         if (name_len && !retval) {
1532                 for (i = 0; i < FB_MAX; i++) {
1533                         if (video_options[i] == NULL)
1534                                 continue;
1535                         opt_len = strlen(video_options[i]);
1536                         if (!opt_len)
1537                                 continue;
1538                         opt = video_options[i];
1539                         if (!strncmp(name, opt, name_len) &&
1540                             opt[name_len] == ':')
1541                                 options = opt + name_len + 1;
1542                 }
1543         }
1544         if (options && !strncmp(options, "off", 3))
1545                 retval = 1;
1546
1547         if (option)
1548                 *option = options;
1549
1550         return retval;
1551 }
1552
1553 /**
1554  *      video_setup - process command line options
1555  *      @options: string of options
1556  *
1557  *      Process command line options for frame buffer subsystem.
1558  *
1559  *      NOTE: This function is a __setup and __init function.
1560  *            It only stores the options.  Drivers have to call
1561  *            fb_get_options() as necessary.
1562  *
1563  *      Returns zero.
1564  *
1565  */
1566 static int __init video_setup(char *options)
1567 {
1568         int i, global = 0;
1569
1570         if (!options || !*options)
1571                 global = 1;
1572
1573         if (!global && !strncmp(options, "ofonly", 6)) {
1574                 ofonly = 1;
1575                 global = 1;
1576         }
1577
1578         if (!global && !strstr(options, "fb:")) {
1579                 global_mode_option = options;
1580                 global = 1;
1581         }
1582
1583         if (!global) {
1584                 for (i = 0; i < FB_MAX; i++) {
1585                         if (video_options[i] == NULL) {
1586                                 video_options[i] = options;
1587                                 break;
1588                         }
1589
1590                 }
1591         }
1592
1593         return 0;
1594 }
1595 __setup("video=", video_setup);
1596
1597     /*
1598      *  Visible symbols for modules
1599      */
1600
1601 EXPORT_SYMBOL(register_framebuffer);
1602 EXPORT_SYMBOL(unregister_framebuffer);
1603 EXPORT_SYMBOL(num_registered_fb);
1604 EXPORT_SYMBOL(registered_fb);
1605 EXPORT_SYMBOL(fb_prepare_logo);
1606 EXPORT_SYMBOL(fb_show_logo);
1607 EXPORT_SYMBOL(fb_set_var);
1608 EXPORT_SYMBOL(fb_blank);
1609 EXPORT_SYMBOL(fb_pan_display);
1610 EXPORT_SYMBOL(fb_get_buffer_offset);
1611 EXPORT_SYMBOL(fb_set_suspend);
1612 EXPORT_SYMBOL(fb_register_client);
1613 EXPORT_SYMBOL(fb_unregister_client);
1614 EXPORT_SYMBOL(fb_get_options);
1615 EXPORT_SYMBOL(fb_new_modelist);
1616
1617 MODULE_LICENSE("GPL");