drivers/video/fbmem.c

   1 /*
   2  *  linux/drivers/video/fbmem.c
   3  *
   4  *  Copyright (C) 1994 Martin Schaller
   5  *
   6  *      2001 - Documented with DocBook
   7  *      - Brad Douglas <brad@neruo.com>
   8  *
   9  * This file is subject to the terms and conditions of the GNU General Public
  10  * License.  See the file COPYING in the main directory of this archive
  11  * for more details.
  12  */
  13
  14 #include <linux/module.h>
  15
  16 #include <linux/compat.h>
  17 #include <linux/types.h>
  18 #include <linux/errno.h>
  19 #include <linux/sched.h>
  20 #include <linux/smp_lock.h>
  21 #include <linux/kernel.h>
  22 #include <linux/major.h>
  23 #include <linux/slab.h>
  24 #include <linux/mm.h>
  25 #include <linux/mman.h>
  26 #include <linux/vt.h>
  27 #include <linux/init.h>
  28 #include <linux/linux_logo.h>
  29 #include <linux/proc_fs.h>
  30 #include <linux/console.h>
  31 #ifdef CONFIG_KMOD
  32 #include <linux/kmod.h>
  33 #endif
  34 #include <linux/err.h>
  35 #include <linux/device.h>
  36 #include <linux/efi.h>
  37
  38 #if defined(__mc68000__) || defined(CONFIG_APUS)
  39 #include <asm/setup.h>
  40 #endif
  41
  42 #include <asm/io.h>
  43 #include <asm/uaccess.h>
  44 #include <asm/page.h>
  45 #include <asm/pgtable.h>
  46
  47 #include <linux/fb.h>
  48
  49     /*
  50      *  Frame buffer device initialization and setup routines
  51      */
  52
  53 #define FBPIXMAPSIZE    (1024 * 8)
  54
  55 struct fb_info *registered_fb[FB_MAX];
  56 int num_registered_fb;
  57
  58 /*
  59  * Helpers
  60  */
  61
  62 int fb_get_color_depth(struct fb_var_screeninfo *var,
  63                        struct fb_fix_screeninfo *fix)
  64 {
  65         int depth = 0;
  66
  67         if (fix->visual == FB_VISUAL_MONO01 ||
  68             fix->visual == FB_VISUAL_MONO10)
  69                 depth = 1;
  70         else {
  71                 if (var->green.length == var->blue.length &&
  72                     var->green.length == var->red.length &&
  73                     var->green.offset == var->blue.offset &&
  74                     var->green.offset == var->red.offset)
  75                         depth = var->green.length;
  76                 else
  77                         depth = var->green.length + var->red.length +
  78                                 var->blue.length;
  79         }
  80
  81         return depth;
  82 }
  83 EXPORT_SYMBOL(fb_get_color_depth);
  84
  85 /*
  86  * Data padding functions.
  87  */
  88 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
  89 {
  90         __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
  91 }
  92 EXPORT_SYMBOL(fb_pad_aligned_buffer);
  93
  94 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
  95                                 u32 shift_high, u32 shift_low, u32 mod)
  96 {
  97         u8 mask = (u8) (0xfff << shift_high), tmp;
  98         int i, j;
  99
 100         for (i = height; i--; ) {
 101                 for (j = 0; j < idx; j++) {
 102                         tmp = dst[j];
 103                         tmp &= mask;
 104                         tmp |= *src >> shift_low;
 105                         dst[j] = tmp;
 106                         tmp = *src << shift_high;
 107                         dst[j+1] = tmp;
 108                         src++;
 109                 }
 110                 tmp = dst[idx];
 111                 tmp &= mask;
 112                 tmp |= *src >> shift_low;
 113                 dst[idx] = tmp;
 114                 if (shift_high < mod) {
 115                         tmp = *src << shift_high;
 116                         dst[idx+1] = tmp;
 117                 }
 118                 src++;
 119                 dst += d_pitch;
 120         }
 121 }
 122 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
 123
 124 /*
 125  * we need to lock this section since fb_cursor
 126  * may use fb_imageblit()
 127  */
 128 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
 129 {
 130         u32 align = buf->buf_align - 1, offset;
 131         char *addr = buf->addr;
 132
 133         /* If IO mapped, we need to sync before access, no sharing of
 134          * the pixmap is done
 135          */
 136         if (buf->flags & FB_PIXMAP_IO) {
 137                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 138                         info->fbops->fb_sync(info);
 139                 return addr;
 140         }
 141
 142         /* See if we fit in the remaining pixmap space */
 143         offset = buf->offset + align;
 144         offset &= ~align;
 145         if (offset + size > buf->size) {
 146                 /* We do not fit. In order to be able to re-use the buffer,
 147                  * we must ensure no asynchronous DMA'ing or whatever operation
 148                  * is in progress, we sync for that.
 149                  */
 150                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 151                         info->fbops->fb_sync(info);
 152                 offset = 0;
 153         }
 154         buf->offset = offset + size;
 155         addr += offset;
 156
 157         return addr;
 158 }
 159
 160 #ifdef CONFIG_LOGO
 161
 162 static inline unsigned safe_shift(unsigned d, int n)
 163 {
 164         return n < 0 ? d >> -n : d << n;
 165 }
 166
 167 static void fb_set_logocmap(struct fb_info *info,
 168                                    const struct linux_logo *logo)
 169 {
 170         struct fb_cmap palette_cmap;
 171         u16 palette_green[16];
 172         u16 palette_blue[16];
 173         u16 palette_red[16];
 174         int i, j, n;
 175         const unsigned char *clut = logo->clut;
 176
 177         palette_cmap.start = 0;
 178         palette_cmap.len = 16;
 179         palette_cmap.red = palette_red;
 180         palette_cmap.green = palette_green;
 181         palette_cmap.blue = palette_blue;
 182         palette_cmap.transp = NULL;
 183
 184         for (i = 0; i < logo->clutsize; i += n) {
 185                 n = logo->clutsize - i;
 186                 /* palette_cmap provides space for only 16 colors at once */
 187                 if (n > 16)
 188                         n = 16;
 189                 palette_cmap.start = 32 + i;
 190                 palette_cmap.len = n;
 191                 for (j = 0; j < n; ++j) {
 192                         palette_cmap.red[j] = clut[0] << 8 | clut[0];
 193                         palette_cmap.green[j] = clut[1] << 8 | clut[1];
 194                         palette_cmap.blue[j] = clut[2] << 8 | clut[2];
 195                         clut += 3;
 196                 }
 197                 fb_set_cmap(&palette_cmap, info);
 198         }
 199 }
 200
 201 static void  fb_set_logo_truepalette(struct fb_info *info,
 202                                             const struct linux_logo *logo,
 203                                             u32 *palette)
 204 {
 205         unsigned char mask[9] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
 206         unsigned char redmask, greenmask, bluemask;
 207         int redshift, greenshift, blueshift;
 208         int i;
 209         const unsigned char *clut = logo->clut;
 210
 211         /*
 212          * We have to create a temporary palette since console palette is only
 213          * 16 colors long.
 214          */
 215         /* Bug: Doesn't obey msb_right ... (who needs that?) */
 216         redmask   = mask[info->var.red.length   < 8 ? info->var.red.length   : 8];
 217         greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
 218         bluemask  = mask[info->var.blue.length  < 8 ? info->var.blue.length  : 8];
 219         redshift   = info->var.red.offset   - (8 - info->var.red.length);
 220         greenshift = info->var.green.offset - (8 - info->var.green.length);
 221         blueshift  = info->var.blue.offset  - (8 - info->var.blue.length);
 222
 223         for ( i = 0; i < logo->clutsize; i++) {
 224                 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
 225                                  safe_shift((clut[1] & greenmask), greenshift) |
 226                                  safe_shift((clut[2] & bluemask), blueshift));
 227                 clut += 3;
 228         }
 229 }
 230
 231 static void fb_set_logo_directpalette(struct fb_info *info,
 232                                              const struct linux_logo *logo,
 233                                              u32 *palette)
 234 {
 235         int redshift, greenshift, blueshift;
 236         int i;
 237
 238         redshift = info->var.red.offset;
 239         greenshift = info->var.green.offset;
 240         blueshift = info->var.blue.offset;
 241
 242         for (i = 32; i < logo->clutsize; i++)
 243                 palette[i] = i << redshift | i << greenshift | i << blueshift;
 244 }
 245
 246 static void fb_set_logo(struct fb_info *info,
 247                                const struct linux_logo *logo, u8 *dst,
 248                                int depth)
 249 {
 250         int i, j, k;
 251         const u8 *src = logo->data;
 252         u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
 253         u8 fg = 1, d;
 254
 255         if (fb_get_color_depth(&info->var, &info->fix) == 3)
 256                 fg = 7;
 257
 258         if (info->fix.visual == FB_VISUAL_MONO01 ||
 259             info->fix.visual == FB_VISUAL_MONO10)
 260                 fg = ~((u8) (0xfff << info->var.green.length));
 261
 262         switch (depth) {
 263         case 4:
 264                 for (i = 0; i < logo->height; i++)
 265                         for (j = 0; j < logo->width; src++) {
 266                                 *dst++ = *src >> 4;
 267                                 j++;
 268                                 if (j < logo->width) {
 269                                         *dst++ = *src & 0x0f;
 270                                         j++;
 271                                 }
 272                         }
 273                 break;
 274         case 1:
 275                 for (i = 0; i < logo->height; i++) {
 276                         for (j = 0; j < logo->width; src++) {
 277                                 d = *src ^ xor;
 278                                 for (k = 7; k >= 0; k--) {
 279                                         *dst++ = ((d >> k) & 1) ? fg : 0;
 280                                         j++;
 281                                 }
 282                         }
 283                 }
 284                 break;
 285         }
 286 }
 287
 288 /*
 289  * Three (3) kinds of logo maps exist.  linux_logo_clut224 (>16 colors),
 290  * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors).  Depending on
 291  * the visual format and color depth of the framebuffer, the DAC, the
 292  * pseudo_palette, and the logo data will be adjusted accordingly.
 293  *
 294  * Case 1 - linux_logo_clut224:
 295  * Color exceeds the number of console colors (16), thus we set the hardware DAC
 296  * using fb_set_cmap() appropriately.  The "needs_cmapreset"  flag will be set.
 297  *
 298  * For visuals that require color info from the pseudo_palette, we also construct
 299  * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
 300  * will be set.
 301  *
 302  * Case 2 - linux_logo_vga16:
 303  * The number of colors just matches the console colors, thus there is no need
 304  * to set the DAC or the pseudo_palette.  However, the bitmap is packed, ie,
 305  * each byte contains color information for two pixels (upper and lower nibble).
 306  * To be consistent with fb_imageblit() usage, we therefore separate the two
 307  * nibbles into separate bytes. The "depth" flag will be set to 4.
 308  *
 309  * Case 3 - linux_logo_mono:
 310  * This is similar with Case 2.  Each byte contains information for 8 pixels.
 311  * We isolate each bit and expand each into a byte. The "depth" flag will
 312  * be set to 1.
 313  */
 314 static struct logo_data {
 315         int depth;
 316         int needs_directpalette;
 317         int needs_truepalette;
 318         int needs_cmapreset;
 319         const struct linux_logo *logo;
 320 } fb_logo;
 321
 322 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
 323 {
 324         u32 size = width * height, i;
 325
 326         out += size - 1;
 327
 328         for (i = size; i--; )
 329                 *out-- = *in++;
 330 }
 331
 332 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
 333 {
 334         int i, j, h = height - 1;
 335
 336         for (i = 0; i < height; i++)
 337                 for (j = 0; j < width; j++)
 338                                 out[height * j + h - i] = *in++;
 339 }
 340
 341 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
 342 {
 343         int i, j, w = width - 1;
 344
 345         for (i = 0; i < height; i++)
 346                 for (j = 0; j < width; j++)
 347                         out[height * (w - j) + i] = *in++;
 348 }
 349
 350 static void fb_rotate_logo(struct fb_info *info, u8 *dst,
 351                            struct fb_image *image, int rotate)
 352 {
 353         u32 tmp;
 354
 355         if (rotate == FB_ROTATE_UD) {
 356                 fb_rotate_logo_ud(image->data, dst, image->width,
 357                                   image->height);
 358                 image->dx = info->var.xres - image->width;
 359                 image->dy = info->var.yres - image->height;
 360         } else if (rotate == FB_ROTATE_CW) {
 361                 fb_rotate_logo_cw(image->data, dst, image->width,
 362                                   image->height);
 363                 tmp = image->width;
 364                 image->width = image->height;
 365                 image->height = tmp;
 366                 image->dx = info->var.xres - image->width;
 367         } else if (rotate == FB_ROTATE_CCW) {
 368                 fb_rotate_logo_ccw(image->data, dst, image->width,
 369                                    image->height);
 370                 tmp = image->width;
 371                 image->width = image->height;
 372                 image->height = tmp;
 373                 image->dy = info->var.yres - image->height;
 374         }
 375
 376         image->data = dst;
 377 }
 378
 379 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
 380                             int rotate)
 381 {
 382         int x;
 383
 384         if (rotate == FB_ROTATE_UR) {
 385                 for (x = 0; x < num_online_cpus() &&
 386                              x * (fb_logo.logo->width + 8) <=
 387                              info->var.xres - fb_logo.logo->width; x++) {
 388                         info->fbops->fb_imageblit(info, image);
 389                         image->dx += fb_logo.logo->width + 8;
 390                 }
 391         } else if (rotate == FB_ROTATE_UD) {
 392                 for (x = 0; x < num_online_cpus() &&
 393                              x * (fb_logo.logo->width + 8) <=
 394                              info->var.xres - fb_logo.logo->width; x++) {
 395                         info->fbops->fb_imageblit(info, image);
 396                         image->dx -= fb_logo.logo->width + 8;
 397                 }
 398         } else if (rotate == FB_ROTATE_CW) {
 399                 for (x = 0; x < num_online_cpus() &&
 400                              x * (fb_logo.logo->width + 8) <=
 401                              info->var.yres - fb_logo.logo->width; x++) {
 402                         info->fbops->fb_imageblit(info, image);
 403                         image->dy += fb_logo.logo->width + 8;
 404                 }
 405         } else if (rotate == FB_ROTATE_CCW) {
 406                 for (x = 0; x < num_online_cpus() &&
 407                              x * (fb_logo.logo->width + 8) <=
 408                              info->var.yres - fb_logo.logo->width; x++) {
 409                         info->fbops->fb_imageblit(info, image);
 410                         image->dy -= fb_logo.logo->width + 8;
 411                 }
 412         }
 413 }
 414
 415 int fb_prepare_logo(struct fb_info *info, int rotate)
 416 {
 417         int depth = fb_get_color_depth(&info->var, &info->fix);
 418         int yres;
 419
 420         memset(&fb_logo, 0, sizeof(struct logo_data));
 421
 422         if (info->flags & FBINFO_MISC_TILEBLITTING)
 423                 return 0;
 424
 425         if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
 426                 depth = info->var.blue.length;
 427                 if (info->var.red.length < depth)
 428                         depth = info->var.red.length;
 429                 if (info->var.green.length < depth)
 430                         depth = info->var.green.length;
 431         }
 432
 433         if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) {
 434                 /* assume console colormap */
 435                 depth = 4;
 436         }
 437
 438         if (depth >= 8) {
 439                 switch (info->fix.visual) {
 440                 case FB_VISUAL_TRUECOLOR:
 441                         fb_logo.needs_truepalette = 1;
 442                         break;
 443                 case FB_VISUAL_DIRECTCOLOR:
 444                         fb_logo.needs_directpalette = 1;
 445                         fb_logo.needs_cmapreset = 1;
 446                         break;
 447                 case FB_VISUAL_PSEUDOCOLOR:
 448                         fb_logo.needs_cmapreset = 1;
 449                         break;
 450                 }
 451         }
 452
 453         /* Return if no suitable logo was found */
 454         fb_logo.logo = fb_find_logo(depth);
 455
 456         if (!fb_logo.logo) {
 457                 return 0;
 458         }
 459
 460         if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
 461                 yres = info->var.yres;
 462         else
 463                 yres = info->var.xres;
 464
 465         if (fb_logo.logo->height > yres) {
 466                 fb_logo.logo = NULL;
 467                 return 0;
 468         }
 469
 470         /* What depth we asked for might be different from what we get */
 471         if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
 472                 fb_logo.depth = 8;
 473         else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
 474                 fb_logo.depth = 4;
 475         else
 476                 fb_logo.depth = 1;
 477         return fb_logo.logo->height;
 478 }
 479
 480 int fb_show_logo(struct fb_info *info, int rotate)
 481 {
 482         u32 *palette = NULL, *saved_pseudo_palette = NULL;
 483         unsigned char *logo_new = NULL, *logo_rotate = NULL;
 484         struct fb_image image;
 485
 486         /* Return if the frame buffer is not mapped or suspended */
 487         if (fb_logo.logo == NULL || info->state != FBINFO_STATE_RUNNING)
 488                 return 0;
 489
 490         image.depth = 8;
 491         image.data = fb_logo.logo->data;
 492
 493         if (fb_logo.needs_cmapreset)
 494                 fb_set_logocmap(info, fb_logo.logo);
 495
 496         if (fb_logo.needs_truepalette ||
 497             fb_logo.needs_directpalette) {
 498                 palette = kmalloc(256 * 4, GFP_KERNEL);
 499                 if (palette == NULL)
 500                         return 0;
 501
 502                 if (fb_logo.needs_truepalette)
 503                         fb_set_logo_truepalette(info, fb_logo.logo, palette);
 504                 else
 505                         fb_set_logo_directpalette(info, fb_logo.logo, palette);
 506
 507                 saved_pseudo_palette = info->pseudo_palette;
 508                 info->pseudo_palette = palette;
 509         }
 510
 511         if (fb_logo.depth <= 4) {
 512                 logo_new = kmalloc(fb_logo.logo->width * fb_logo.logo->height,
 513                                    GFP_KERNEL);
 514                 if (logo_new == NULL) {
 515                         kfree(palette);
 516                         if (saved_pseudo_palette)
 517                                 info->pseudo_palette = saved_pseudo_palette;
 518                         return 0;
 519                 }
 520                 image.data = logo_new;
 521                 fb_set_logo(info, fb_logo.logo, logo_new, fb_logo.depth);
 522         }
 523
 524         image.dx = 0;
 525         image.dy = 0;
 526         image.width = fb_logo.logo->width;
 527         image.height = fb_logo.logo->height;
 528
 529         if (rotate) {
 530                 logo_rotate = kmalloc(fb_logo.logo->width *
 531                                       fb_logo.logo->height, GFP_KERNEL);
 532                 if (logo_rotate)
 533                         fb_rotate_logo(info, logo_rotate, &image, rotate);
 534         }
 535
 536         fb_do_show_logo(info, &image, rotate);
 537
 538         kfree(palette);
 539         if (saved_pseudo_palette != NULL)
 540                 info->pseudo_palette = saved_pseudo_palette;
 541         kfree(logo_new);
 542         kfree(logo_rotate);
 543         return fb_logo.logo->height;
 544 }
 545 #else
 546 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
 547 int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
 548 #endif /* CONFIG_LOGO */
 549
 550 static int fbmem_read_proc(char *buf, char **start, off_t offset,
 551                            int len, int *eof, void *private)
 552 {
 553         struct fb_info **fi;
 554         int clen;
 555
 556         clen = 0;
 557         for (fi = registered_fb; fi < &registered_fb[FB_MAX] && 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 -EFBIG;
 673
 674         if (count > total_size) {
 675                 err = -EFBIG;
 676                 count = total_size;
 677         }
 678
 679         if (count + p > total_size) {
 680                 if (!err)
 681                         err = -ENOSPC;
 682
 683                 count = total_size - p;
 684         }
 685
 686         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 687                          GFP_KERNEL);
 688         if (!buffer)
 689                 return -ENOMEM;
 690
 691         dst = (u32 __iomem *) (info->screen_base + p);
 692
 693         if (info->fbops->fb_sync)
 694                 info->fbops->fb_sync(info);
 695
 696         while (count) {
 697                 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 698                 src = buffer;
 699
 700                 if (copy_from_user(src, buf, c)) {
 701                         err = -EFAULT;
 702                         break;
 703                 }
 704
 705                 for (i = c >> 2; i--; )
 706                         fb_writel(*src++, dst++);
 707
 708                 if (c & 3) {
 709                         u8 *src8 = (u8 *) src;
 710                         u8 __iomem *dst8 = (u8 __iomem *) dst;
 711
 712                         for (i = c & 3; i--; )
 713                                 fb_writeb(*src8++, dst8++);
 714
 715                         dst = (u32 __iomem *) dst8;
 716                 }
 717
 718                 *ppos += c;
 719                 buf += c;
 720                 cnt += c;
 721                 count -= c;
 722         }
 723
 724         kfree(buffer);
 725
 726         return (cnt) ? cnt : err;
 727 }
 728
 729 #ifdef CONFIG_KMOD
 730 static void try_to_load(int fb)
 731 {
 732         request_module("fb%d", fb);
 733 }
 734 #endif /* CONFIG_KMOD */
 735
 736 int
 737 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
 738 {
 739         struct fb_fix_screeninfo *fix = &info->fix;
 740         int xoffset = var->xoffset;
 741         int yoffset = var->yoffset;
 742         int err = 0, yres = info->var.yres;
 743
 744         if (var->yoffset > 0) {
 745                 if (var->vmode & FB_VMODE_YWRAP) {
 746                         if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
 747                                 err = -EINVAL;
 748                         else
 749                                 yres = 0;
 750                 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
 751                         err = -EINVAL;
 752         }
 753
 754         if (var->xoffset > 0 && (!fix->xpanstep ||
 755                                  (var->xoffset % fix->xpanstep)))
 756                 err = -EINVAL;
 757
 758         if (err || !info->fbops->fb_pan_display || xoffset < 0 ||
 759             yoffset < 0 || var->yoffset + yres > info->var.yres_virtual ||
 760             var->xoffset + info->var.xres > info->var.xres_virtual)
 761                 return -EINVAL;
 762
 763         if ((err = info->fbops->fb_pan_display(var, info)))
 764                 return err;
 765         info->var.xoffset = var->xoffset;
 766         info->var.yoffset = var->yoffset;
 767         if (var->vmode & FB_VMODE_YWRAP)
 768                 info->var.vmode |= FB_VMODE_YWRAP;
 769         else
 770                 info->var.vmode &= ~FB_VMODE_YWRAP;
 771         return 0;
 772 }
 773
 774 int
 775 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
 776 {
 777         int err, flags = info->flags;
 778
 779         if (var->activate & FB_ACTIVATE_INV_MODE) {
 780                 struct fb_videomode mode1, mode2;
 781                 int ret = 0;
 782
 783                 fb_var_to_videomode(&mode1, var);
 784                 fb_var_to_videomode(&mode2, &info->var);
 785                 /* make sure we don't delete the videomode of current var */
 786                 ret = fb_mode_is_equal(&mode1, &mode2);
 787
 788                 if (!ret) {
 789                     struct fb_event event;
 790
 791                     event.info = info;
 792                     event.data = &mode1;
 793                     ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event);
 794                 }
 795
 796                 if (!ret)
 797                     fb_delete_videomode(&mode1, &info->modelist);
 798
 799                 return ret;
 800         }
 801
 802         if ((var->activate & FB_ACTIVATE_FORCE) ||
 803             memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
 804                 if (!info->fbops->fb_check_var) {
 805                         *var = info->var;
 806                         return 0;
 807                 }
 808
 809                 if ((err = info->fbops->fb_check_var(var, info)))
 810                         return err;
 811
 812                 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
 813                         struct fb_videomode mode;
 814                         int err = 0;
 815
 816                         info->var = *var;
 817                         if (info->fbops->fb_set_par)
 818                                 info->fbops->fb_set_par(info);
 819
 820                         fb_pan_display(info, &info->var);
 821
 822                         fb_set_cmap(&info->cmap, info);
 823
 824                         fb_var_to_videomode(&mode, &info->var);
 825
 826                         if (info->modelist.prev && info->modelist.next &&
 827                             !list_empty(&info->modelist))
 828                                 err = fb_add_videomode(&mode, &info->modelist);
 829
 830                         if (!err && (flags & FBINFO_MISC_USEREVENT)) {
 831                                 struct fb_event event;
 832                                 int evnt = (var->activate & FB_ACTIVATE_ALL) ?
 833                                         FB_EVENT_MODE_CHANGE_ALL :
 834                                         FB_EVENT_MODE_CHANGE;
 835
 836                                 info->flags &= ~FBINFO_MISC_USEREVENT;
 837                                 event.info = info;
 838                                 fb_notifier_call_chain(evnt, &event);
 839                         }
 840                 }
 841         }
 842         return 0;
 843 }
 844
 845 int
 846 fb_blank(struct fb_info *info, int blank)
 847 {
 848         int ret = -EINVAL;
 849
 850         if (blank > FB_BLANK_POWERDOWN)
 851                 blank = FB_BLANK_POWERDOWN;
 852
 853         if (info->fbops->fb_blank)
 854                 ret = info->fbops->fb_blank(blank, info);
 855
 856         if (!ret) {
 857                 struct fb_event event;
 858
 859                 event.info = info;
 860                 event.data = &blank;
 861                 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
 862         }
 863
 864         return ret;
 865 }
 866
 867 static int
 868 fb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
 869          unsigned long arg)
 870 {
 871         int fbidx = iminor(inode);
 872         struct fb_info *info = registered_fb[fbidx];
 873         struct fb_ops *fb = info->fbops;
 874         struct fb_var_screeninfo var;
 875         struct fb_fix_screeninfo fix;
 876         struct fb_con2fbmap con2fb;
 877         struct fb_cmap_user cmap;
 878         struct fb_event event;
 879         void __user *argp = (void __user *)arg;
 880         int i;
 881
 882         if (!fb)
 883                 return -ENODEV;
 884         switch (cmd) {
 885         case FBIOGET_VSCREENINFO:
 886                 return copy_to_user(argp, &info->var,
 887                                     sizeof(var)) ? -EFAULT : 0;
 888         case FBIOPUT_VSCREENINFO:
 889                 if (copy_from_user(&var, argp, sizeof(var)))
 890                         return -EFAULT;
 891                 acquire_console_sem();
 892                 info->flags |= FBINFO_MISC_USEREVENT;
 893                 i = fb_set_var(info, &var);
 894                 info->flags &= ~FBINFO_MISC_USEREVENT;
 895                 release_console_sem();
 896                 if (i) return i;
 897                 if (copy_to_user(argp, &var, sizeof(var)))
 898                         return -EFAULT;
 899                 return 0;
 900         case FBIOGET_FSCREENINFO:
 901                 return copy_to_user(argp, &info->fix,
 902                                     sizeof(fix)) ? -EFAULT : 0;
 903         case FBIOPUTCMAP:
 904                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
 905                         return -EFAULT;
 906                 return (fb_set_user_cmap(&cmap, info));
 907         case FBIOGETCMAP:
 908                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
 909                         return -EFAULT;
 910                 return fb_cmap_to_user(&info->cmap, &cmap);
 911         case FBIOPAN_DISPLAY:
 912                 if (copy_from_user(&var, argp, sizeof(var)))
 913                         return -EFAULT;
 914                 acquire_console_sem();
 915                 i = fb_pan_display(info, &var);
 916                 release_console_sem();
 917                 if (i)
 918                         return i;
 919                 if (copy_to_user(argp, &var, sizeof(var)))
 920                         return -EFAULT;
 921                 return 0;
 922         case FBIO_CURSOR:
 923                 return -EINVAL;
 924         case FBIOGET_CON2FBMAP:
 925                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
 926                         return -EFAULT;
 927                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
 928                     return -EINVAL;
 929                 con2fb.framebuffer = -1;
 930                 event.info = info;
 931                 event.data = &con2fb;
 932                 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
 933                 return copy_to_user(argp, &con2fb,
 934                                     sizeof(con2fb)) ? -EFAULT : 0;
 935         case FBIOPUT_CON2FBMAP:
 936                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
 937                         return - EFAULT;
 938                 if (con2fb.console < 0 || con2fb.console > MAX_NR_CONSOLES)
 939                     return -EINVAL;
 940                 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
 941                     return -EINVAL;
 942 #ifdef CONFIG_KMOD
 943                 if (!registered_fb[con2fb.framebuffer])
 944                     try_to_load(con2fb.framebuffer);
 945 #endif /* CONFIG_KMOD */
 946                 if (!registered_fb[con2fb.framebuffer])
 947                     return -EINVAL;
 948                 event.info = info;
 949                 event.data = &con2fb;
 950                 return fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP,
 951                                               &event);
 952         case FBIOBLANK:
 953                 acquire_console_sem();
 954                 info->flags |= FBINFO_MISC_USEREVENT;
 955                 i = fb_blank(info, arg);
 956                 info->flags &= ~FBINFO_MISC_USEREVENT;
 957                 release_console_sem();
 958                 return i;
 959         default:
 960                 if (fb->fb_ioctl == NULL)
 961                         return -EINVAL;
 962                 return fb->fb_ioctl(info, cmd, arg);
 963         }
 964 }
 965
 966 #ifdef CONFIG_COMPAT
 967 struct fb_fix_screeninfo32 {
 968         char                    id[16];
 969         compat_caddr_t          smem_start;
 970         u32                     smem_len;
 971         u32                     type;
 972         u32                     type_aux;
 973         u32                     visual;
 974         u16                     xpanstep;
 975         u16                     ypanstep;
 976         u16                     ywrapstep;
 977         u32                     line_length;
 978         compat_caddr_t          mmio_start;
 979         u32                     mmio_len;
 980         u32                     accel;
 981         u16                     reserved[3];
 982 };
 983
 984 struct fb_cmap32 {
 985         u32                     start;
 986         u32                     len;
 987         compat_caddr_t  red;
 988         compat_caddr_t  green;
 989         compat_caddr_t  blue;
 990         compat_caddr_t  transp;
 991 };
 992
 993 static int fb_getput_cmap(struct inode *inode, struct file *file,
 994                         unsigned int cmd, unsigned long arg)
 995 {
 996         struct fb_cmap_user __user *cmap;
 997         struct fb_cmap32 __user *cmap32;
 998         __u32 data;
 999         int err;
1000
1001         cmap = compat_alloc_user_space(sizeof(*cmap));
1002         cmap32 = compat_ptr(arg);
1003
1004         if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1005                 return -EFAULT;
1006
1007         if (get_user(data, &cmap32->red) ||
1008             put_user(compat_ptr(data), &cmap->red) ||
1009             get_user(data, &cmap32->green) ||
1010             put_user(compat_ptr(data), &cmap->green) ||
1011             get_user(data, &cmap32->blue) ||
1012             put_user(compat_ptr(data), &cmap->blue) ||
1013             get_user(data, &cmap32->transp) ||
1014             put_user(compat_ptr(data), &cmap->transp))
1015                 return -EFAULT;
1016
1017         err = fb_ioctl(inode, file, cmd, (unsigned long) cmap);
1018
1019         if (!err) {
1020                 if (copy_in_user(&cmap32->start,
1021                                  &cmap->start,
1022                                  2 * sizeof(__u32)))
1023                         err = -EFAULT;
1024         }
1025         return err;
1026 }
1027
1028 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1029                                   struct fb_fix_screeninfo32 __user *fix32)
1030 {
1031         __u32 data;
1032         int err;
1033
1034         err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1035
1036         data = (__u32) (unsigned long) fix->smem_start;
1037         err |= put_user(data, &fix32->smem_start);
1038
1039         err |= put_user(fix->smem_len, &fix32->smem_len);
1040         err |= put_user(fix->type, &fix32->type);
1041         err |= put_user(fix->type_aux, &fix32->type_aux);
1042         err |= put_user(fix->visual, &fix32->visual);
1043         err |= put_user(fix->xpanstep, &fix32->xpanstep);
1044         err |= put_user(fix->ypanstep, &fix32->ypanstep);
1045         err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1046         err |= put_user(fix->line_length, &fix32->line_length);
1047
1048         data = (__u32) (unsigned long) fix->mmio_start;
1049         err |= put_user(data, &fix32->mmio_start);
1050
1051         err |= put_user(fix->mmio_len, &fix32->mmio_len);
1052         err |= put_user(fix->accel, &fix32->accel);
1053         err |= copy_to_user(fix32->reserved, fix->reserved,
1054                             sizeof(fix->reserved));
1055
1056         return err;
1057 }
1058
1059 static int fb_get_fscreeninfo(struct inode *inode, struct file *file,
1060                                 unsigned int cmd, unsigned long arg)
1061 {
1062         mm_segment_t old_fs;
1063         struct fb_fix_screeninfo fix;
1064         struct fb_fix_screeninfo32 __user *fix32;
1065         int err;
1066
1067         fix32 = compat_ptr(arg);
1068
1069         old_fs = get_fs();
1070         set_fs(KERNEL_DS);
1071         err = fb_ioctl(inode, file, cmd, (unsigned long) &fix);
1072         set_fs(old_fs);
1073
1074         if (!err)
1075                 err = do_fscreeninfo_to_user(&fix, fix32);
1076
1077         return err;
1078 }
1079
1080 static long
1081 fb_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1082 {
1083         struct inode *inode = file->f_dentry->d_inode;
1084         int fbidx = iminor(inode);
1085         struct fb_info *info = registered_fb[fbidx];
1086         struct fb_ops *fb = info->fbops;
1087         long ret = -ENOIOCTLCMD;
1088
1089         lock_kernel();
1090         switch(cmd) {
1091         case FBIOGET_VSCREENINFO:
1092         case FBIOPUT_VSCREENINFO:
1093         case FBIOPAN_DISPLAY:
1094         case FBIOGET_CON2FBMAP:
1095         case FBIOPUT_CON2FBMAP:
1096                 arg = (unsigned long) compat_ptr(arg);
1097         case FBIOBLANK:
1098                 ret = fb_ioctl(inode, file, cmd, arg);
1099                 break;
1100
1101         case FBIOGET_FSCREENINFO:
1102                 ret = fb_get_fscreeninfo(inode, file, cmd, arg);
1103                 break;
1104
1105         case FBIOGETCMAP:
1106         case FBIOPUTCMAP:
1107                 ret = fb_getput_cmap(inode, file, cmd, arg);
1108                 break;
1109
1110         default:
1111                 if (fb->fb_compat_ioctl)
1112                         ret = fb->fb_compat_ioctl(info, cmd, arg);
1113                 break;
1114         }
1115         unlock_kernel();
1116         return ret;
1117 }
1118 #endif
1119
1120 static int
1121 fb_mmap(struct file *file, struct vm_area_struct * vma)
1122 {
1123         int fbidx = iminor(file->f_dentry->d_inode);
1124         struct fb_info *info = registered_fb[fbidx];
1125         struct fb_ops *fb = info->fbops;
1126         unsigned long off;
1127 #if !defined(__sparc__) || defined(__sparc_v9__)
1128         unsigned long start;
1129         u32 len;
1130 #endif
1131
1132         if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
1133                 return -EINVAL;
1134         off = vma->vm_pgoff << PAGE_SHIFT;
1135         if (!fb)
1136                 return -ENODEV;
1137         if (fb->fb_mmap) {
1138                 int res;
1139                 lock_kernel();
1140                 res = fb->fb_mmap(info, vma);
1141                 unlock_kernel();
1142                 return res;
1143         }
1144
1145 #if defined(__sparc__) && !defined(__sparc_v9__)
1146         /* Should never get here, all fb drivers should have their own
1147            mmap routines */
1148         return -EINVAL;
1149 #else
1150         /* !sparc32... */
1151         lock_kernel();
1152
1153         /* frame buffer memory */
1154         start = info->fix.smem_start;
1155         len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
1156         if (off >= len) {
1157                 /* memory mapped io */
1158                 off -= len;
1159                 if (info->var.accel_flags) {
1160                         unlock_kernel();
1161                         return -EINVAL;
1162                 }
1163                 start = info->fix.mmio_start;
1164                 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
1165         }
1166         unlock_kernel();
1167         start &= PAGE_MASK;
1168         if ((vma->vm_end - vma->vm_start + off) > len)
1169                 return -EINVAL;
1170         off += start;
1171         vma->vm_pgoff = off >> PAGE_SHIFT;
1172         /* This is an IO map - tell maydump to skip this VMA */
1173         vma->vm_flags |= VM_IO | VM_RESERVED;
1174 #if defined(__mc68000__)
1175 #if defined(CONFIG_SUN3)
1176         pgprot_val(vma->vm_page_prot) |= SUN3_PAGE_NOCACHE;
1177 #elif defined(CONFIG_MMU)
1178         if (CPU_IS_020_OR_030)
1179                 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE030;
1180         if (CPU_IS_040_OR_060) {
1181                 pgprot_val(vma->vm_page_prot) &= _CACHEMASK040;
1182                 /* Use no-cache mode, serialized */
1183                 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE_S;
1184         }
1185 #endif
1186 #elif defined(__powerpc__)
1187         vma->vm_page_prot = phys_mem_access_prot(file, off >> PAGE_SHIFT,
1188                                                  vma->vm_end - vma->vm_start,
1189                                                  vma->vm_page_prot);
1190 #elif defined(__alpha__)
1191         /* Caching is off in the I/O space quadrant by design.  */
1192 #elif defined(__i386__) || defined(__x86_64__)
1193         if (boot_cpu_data.x86 > 3)
1194                 pgprot_val(vma->vm_page_prot) |= _PAGE_PCD;
1195 #elif defined(__mips__) || defined(__sparc_v9__)
1196         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1197 #elif defined(__hppa__)
1198         pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
1199 #elif defined(__arm__) || defined(__sh__) || defined(__m32r__)
1200         vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
1201 #elif defined(__ia64__)
1202         if (efi_range_is_wc(vma->vm_start, vma->vm_end - vma->vm_start))
1203                 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
1204         else
1205                 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1206 #else
1207 #warning What do we have to do here??
1208 #endif
1209         if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1210                              vma->vm_end - vma->vm_start, vma->vm_page_prot))
1211                 return -EAGAIN;
1212         return 0;
1213 #endif /* !sparc32 */
1214 }
1215
1216 static int
1217 fb_open(struct inode *inode, struct file *file)
1218 {
1219         int fbidx = iminor(inode);
1220         struct fb_info *info;
1221         int res = 0;
1222
1223         if (fbidx >= FB_MAX)
1224                 return -ENODEV;
1225 #ifdef CONFIG_KMOD
1226         if (!(info = registered_fb[fbidx]))
1227                 try_to_load(fbidx);
1228 #endif /* CONFIG_KMOD */
1229         if (!(info = registered_fb[fbidx]))
1230                 return -ENODEV;
1231         if (!try_module_get(info->fbops->owner))
1232                 return -ENODEV;
1233         file->private_data = info;
1234         if (info->fbops->fb_open) {
1235                 res = info->fbops->fb_open(info,1);
1236                 if (res)
1237                         module_put(info->fbops->owner);
1238         }
1239         return res;
1240 }
1241
1242 static int
1243 fb_release(struct inode *inode, struct file *file)
1244 {
1245         struct fb_info * const info = file->private_data;
1246
1247         lock_kernel();
1248         if (info->fbops->fb_release)
1249                 info->fbops->fb_release(info,1);
1250         module_put(info->fbops->owner);
1251         unlock_kernel();
1252         return 0;
1253 }
1254
1255 static struct file_operations fb_fops = {
1256         .owner =        THIS_MODULE,
1257         .read =         fb_read,
1258         .write =        fb_write,
1259         .ioctl =        fb_ioctl,
1260 #ifdef CONFIG_COMPAT
1261         .compat_ioctl = fb_compat_ioctl,
1262 #endif
1263         .mmap =         fb_mmap,
1264         .open =         fb_open,
1265         .release =      fb_release,
1266 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1267         .get_unmapped_area = get_fb_unmapped_area,
1268 #endif
1269 };
1270
1271 struct class *fb_class;
1272 EXPORT_SYMBOL(fb_class);
1273 /**
1274  *      register_framebuffer - registers a frame buffer device
1275  *      @fb_info: frame buffer info structure
1276  *
1277  *      Registers a frame buffer device @fb_info.
1278  *
1279  *      Returns negative errno on error, or zero for success.
1280  *
1281  */
1282
1283 int
1284 register_framebuffer(struct fb_info *fb_info)
1285 {
1286         int i;
1287         struct fb_event event;
1288         struct fb_videomode mode;
1289
1290         if (num_registered_fb == FB_MAX)
1291                 return -ENXIO;
1292         num_registered_fb++;
1293         for (i = 0 ; i < FB_MAX; i++)
1294                 if (!registered_fb[i])
1295                         break;
1296         fb_info->node = i;
1297
1298         fb_info->class_device = class_device_create(fb_class, NULL, MKDEV(FB_MAJOR, i),
1299                                     fb_info->device, "fb%d", i);
1300         if (IS_ERR(fb_info->class_device)) {
1301                 /* Not fatal */
1302                 printk(KERN_WARNING "Unable to create class_device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->class_device));
1303                 fb_info->class_device = NULL;
1304         } else
1305                 fb_init_class_device(fb_info);
1306
1307         if (fb_info->pixmap.addr == NULL) {
1308                 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1309                 if (fb_info->pixmap.addr) {
1310                         fb_info->pixmap.size = FBPIXMAPSIZE;
1311                         fb_info->pixmap.buf_align = 1;
1312                         fb_info->pixmap.scan_align = 1;
1313                         fb_info->pixmap.access_align = 32;
1314                         fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1315                 }
1316         }
1317         fb_info->pixmap.offset = 0;
1318
1319         if (!fb_info->modelist.prev || !fb_info->modelist.next)
1320                 INIT_LIST_HEAD(&fb_info->modelist);
1321
1322         fb_var_to_videomode(&mode, &fb_info->var);
1323         fb_add_videomode(&mode, &fb_info->modelist);
1324         registered_fb[i] = fb_info;
1325
1326         event.info = fb_info;
1327         fb_notifier_call_chain(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         struct fb_event event;
1346         int i;
1347
1348         i = fb_info->node;
1349         if (!registered_fb[i])
1350                 return -EINVAL;
1351
1352         if (fb_info->pixmap.addr &&
1353             (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1354                 kfree(fb_info->pixmap.addr);
1355         fb_destroy_modelist(&fb_info->modelist);
1356         registered_fb[i]=NULL;
1357         num_registered_fb--;
1358         fb_cleanup_class_device(fb_info);
1359         class_device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1360         event.info = fb_info;
1361         fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1362         return 0;
1363 }
1364
1365 /**
1366  *      fb_set_suspend - low level driver signals suspend
1367  *      @info: framebuffer affected
1368  *      @state: 0 = resuming, !=0 = suspending
1369  *
1370  *      This is meant to be used by low level drivers to
1371  *      signal suspend/resume to the core & clients.
1372  *      It must be called with the console semaphore held
1373  */
1374 void fb_set_suspend(struct fb_info *info, int state)
1375 {
1376         struct fb_event event;
1377
1378         event.info = info;
1379         if (state) {
1380                 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event);
1381                 info->state = FBINFO_STATE_SUSPENDED;
1382         } else {
1383                 info->state = FBINFO_STATE_RUNNING;
1384                 fb_notifier_call_chain(FB_EVENT_RESUME, &event);
1385         }
1386 }
1387
1388 /**
1389  *      fbmem_init - init frame buffer subsystem
1390  *
1391  *      Initialize the frame buffer subsystem.
1392  *
1393  *      NOTE: This function is _only_ to be called by drivers/char/mem.c.
1394  *
1395  */
1396
1397 static int __init
1398 fbmem_init(void)
1399 {
1400         create_proc_read_entry("fb", 0, NULL, fbmem_read_proc, NULL);
1401
1402         if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1403                 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1404
1405         fb_class = class_create(THIS_MODULE, "graphics");
1406         if (IS_ERR(fb_class)) {
1407                 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1408                 fb_class = NULL;
1409         }
1410         return 0;
1411 }
1412
1413 #ifdef MODULE
1414 module_init(fbmem_init);
1415 static void __exit
1416 fbmem_exit(void)
1417 {
1418         class_destroy(fb_class);
1419         unregister_chrdev(FB_MAJOR, "fb");
1420 }
1421
1422 module_exit(fbmem_exit);
1423 MODULE_LICENSE("GPL");
1424 MODULE_DESCRIPTION("Framebuffer base");
1425 #else
1426 subsys_initcall(fbmem_init);
1427 #endif
1428
1429 int fb_new_modelist(struct fb_info *info)
1430 {
1431         struct fb_event event;
1432         struct fb_var_screeninfo var = info->var;
1433         struct list_head *pos, *n;
1434         struct fb_modelist *modelist;
1435         struct fb_videomode *m, mode;
1436         int err = 1;
1437
1438         list_for_each_safe(pos, n, &info->modelist) {
1439                 modelist = list_entry(pos, struct fb_modelist, list);
1440                 m = &modelist->mode;
1441                 fb_videomode_to_var(&var, m);
1442                 var.activate = FB_ACTIVATE_TEST;
1443                 err = fb_set_var(info, &var);
1444                 fb_var_to_videomode(&mode, &var);
1445                 if (err || !fb_mode_is_equal(m, &mode)) {
1446                         list_del(pos);
1447                         kfree(pos);
1448                 }
1449         }
1450
1451         err = 1;
1452
1453         if (!list_empty(&info->modelist)) {
1454                 event.info = info;
1455                 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
1456         }
1457
1458         return err;
1459 }
1460
1461 static char *video_options[FB_MAX];
1462 static int ofonly;
1463
1464 extern const char *global_mode_option;
1465
1466 /**
1467  * fb_get_options - get kernel boot parameters
1468  * @name:   framebuffer name as it would appear in
1469  *          the boot parameter line
1470  *          (video=<name>:<options>)
1471  * @option: the option will be stored here
1472  *
1473  * NOTE: Needed to maintain backwards compatibility
1474  */
1475 int fb_get_options(char *name, char **option)
1476 {
1477         char *opt, *options = NULL;
1478         int opt_len, retval = 0;
1479         int name_len = strlen(name), i;
1480
1481         if (name_len && ofonly && strncmp(name, "offb", 4))
1482                 retval = 1;
1483
1484         if (name_len && !retval) {
1485                 for (i = 0; i < FB_MAX; i++) {
1486                         if (video_options[i] == NULL)
1487                                 continue;
1488                         opt_len = strlen(video_options[i]);
1489                         if (!opt_len)
1490                                 continue;
1491                         opt = video_options[i];
1492                         if (!strncmp(name, opt, name_len) &&
1493                             opt[name_len] == ':')
1494                                 options = opt + name_len + 1;
1495                 }
1496         }
1497         if (options && !strncmp(options, "off", 3))
1498                 retval = 1;
1499
1500         if (option)
1501                 *option = options;
1502
1503         return retval;
1504 }
1505
1506 #ifndef MODULE
1507 /**
1508  *      video_setup - process command line options
1509  *      @options: string of options
1510  *
1511  *      Process command line options for frame buffer subsystem.
1512  *
1513  *      NOTE: This function is a __setup and __init function.
1514  *            It only stores the options.  Drivers have to call
1515  *            fb_get_options() as necessary.
1516  *
1517  *      Returns zero.
1518  *
1519  */
1520 static int __init video_setup(char *options)
1521 {
1522         int i, global = 0;
1523
1524         if (!options || !*options)
1525                 global = 1;
1526
1527         if (!global && !strncmp(options, "ofonly", 6)) {
1528                 ofonly = 1;
1529                 global = 1;
1530         }
1531
1532         if (!global && !strstr(options, "fb:")) {
1533                 global_mode_option = options;
1534                 global = 1;
1535         }
1536
1537         if (!global) {
1538                 for (i = 0; i < FB_MAX; i++) {
1539                         if (video_options[i] == NULL) {
1540                                 video_options[i] = options;
1541                                 break;
1542                         }
1543
1544                 }
1545         }
1546
1547         return 1;
1548 }
1549 __setup("video=", video_setup);
1550 #endif
1551
1552     /*
1553      *  Visible symbols for modules
1554      */
1555
1556 EXPORT_SYMBOL(register_framebuffer);
1557 EXPORT_SYMBOL(unregister_framebuffer);
1558 EXPORT_SYMBOL(num_registered_fb);
1559 EXPORT_SYMBOL(registered_fb);
1560 EXPORT_SYMBOL(fb_prepare_logo);
1561 EXPORT_SYMBOL(fb_show_logo);
1562 EXPORT_SYMBOL(fb_set_var);
1563 EXPORT_SYMBOL(fb_blank);
1564 EXPORT_SYMBOL(fb_pan_display);
1565 EXPORT_SYMBOL(fb_get_buffer_offset);
1566 EXPORT_SYMBOL(fb_set_suspend);
1567 EXPORT_SYMBOL(fb_get_options);
1568
1569 MODULE_LICENSE("GPL");