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

   1 /*
   2  *  linux/drivers/video/fbmem.c
   3  *
   4  *  Copyright (C) 1994 Martin Schaller
   5  *
   6  *      2001 - Documented with DocBook
   7  *      - Brad Douglas <brad@neruo.com>
   8  *
   9  * This file is subject to the terms and conditions of the GNU General Public
  10  * License.  See the file COPYING in the main directory of this archive
  11  * for more details.
  12  */
  13
  14 #include <linux/config.h>
  15 #include <linux/module.h>
  16
  17 #include <linux/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/err.h>
  36 #include <linux/device.h>
  37 #include <linux/efi.h>
  38
  39 #if defined(__mc68000__) || defined(CONFIG_APUS)
  40 #include <asm/setup.h>
  41 #endif
  42
  43 #include <asm/io.h>
  44 #include <asm/uaccess.h>
  45 #include <asm/page.h>
  46 #include <asm/pgtable.h>
  47
  48 #include <linux/fb.h>
  49
  50     /*
  51      *  Frame buffer device initialization and setup routines
  52      */
  53
  54 #define FBPIXMAPSIZE    (1024 * 8)
  55
  56 static BLOCKING_NOTIFIER_HEAD(fb_notifier_list);
  57 struct fb_info *registered_fb[FB_MAX];
  58 int num_registered_fb;
  59
  60 /*
  61  * Helpers
  62  */
  63
  64 int fb_get_color_depth(struct fb_var_screeninfo *var,
  65                        struct fb_fix_screeninfo *fix)
  66 {
  67         int depth = 0;
  68
  69         if (fix->visual == FB_VISUAL_MONO01 ||
  70             fix->visual == FB_VISUAL_MONO10)
  71                 depth = 1;
  72         else {
  73                 if (var->green.length == var->blue.length &&
  74                     var->green.length == var->red.length &&
  75                     var->green.offset == var->blue.offset &&
  76                     var->green.offset == var->red.offset)
  77                         depth = var->green.length;
  78                 else
  79                         depth = var->green.length + var->red.length +
  80                                 var->blue.length;
  81         }
  82
  83         return depth;
  84 }
  85 EXPORT_SYMBOL(fb_get_color_depth);
  86
  87 /*
  88  * Data padding functions.
  89  */
  90 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
  91 {
  92         __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
  93 }
  94 EXPORT_SYMBOL(fb_pad_aligned_buffer);
  95
  96 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
  97                                 u32 shift_high, u32 shift_low, u32 mod)
  98 {
  99         u8 mask = (u8) (0xfff << shift_high), tmp;
 100         int i, j;
 101
 102         for (i = height; i--; ) {
 103                 for (j = 0; j < idx; j++) {
 104                         tmp = dst[j];
 105                         tmp &= mask;
 106                         tmp |= *src >> shift_low;
 107                         dst[j] = tmp;
 108                         tmp = *src << shift_high;
 109                         dst[j+1] = tmp;
 110                         src++;
 111                 }
 112                 tmp = dst[idx];
 113                 tmp &= mask;
 114                 tmp |= *src >> shift_low;
 115                 dst[idx] = tmp;
 116                 if (shift_high < mod) {
 117                         tmp = *src << shift_high;
 118                         dst[idx+1] = tmp;
 119                 }
 120                 src++;
 121                 dst += d_pitch;
 122         }
 123 }
 124 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
 125
 126 /*
 127  * we need to lock this section since fb_cursor
 128  * may use fb_imageblit()
 129  */
 130 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
 131 {
 132         u32 align = buf->buf_align - 1, offset;
 133         char *addr = buf->addr;
 134
 135         /* If IO mapped, we need to sync before access, no sharing of
 136          * the pixmap is done
 137          */
 138         if (buf->flags & FB_PIXMAP_IO) {
 139                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 140                         info->fbops->fb_sync(info);
 141                 return addr;
 142         }
 143
 144         /* See if we fit in the remaining pixmap space */
 145         offset = buf->offset + align;
 146         offset &= ~align;
 147         if (offset + size > buf->size) {
 148                 /* We do not fit. In order to be able to re-use the buffer,
 149                  * we must ensure no asynchronous DMA'ing or whatever operation
 150                  * is in progress, we sync for that.
 151                  */
 152                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 153                         info->fbops->fb_sync(info);
 154                 offset = 0;
 155         }
 156         buf->offset = offset + size;
 157         addr += offset;
 158
 159         return addr;
 160 }
 161
 162 #ifdef CONFIG_LOGO
 163
 164 static inline unsigned safe_shift(unsigned d, int n)
 165 {
 166         return n < 0 ? d >> -n : d << n;
 167 }
 168
 169 static void fb_set_logocmap(struct fb_info *info,
 170                                    const struct linux_logo *logo)
 171 {
 172         struct fb_cmap palette_cmap;
 173         u16 palette_green[16];
 174         u16 palette_blue[16];
 175         u16 palette_red[16];
 176         int i, j, n;
 177         const unsigned char *clut = logo->clut;
 178
 179         palette_cmap.start = 0;
 180         palette_cmap.len = 16;
 181         palette_cmap.red = palette_red;
 182         palette_cmap.green = palette_green;
 183         palette_cmap.blue = palette_blue;
 184         palette_cmap.transp = NULL;
 185
 186         for (i = 0; i < logo->clutsize; i += n) {
 187                 n = logo->clutsize - i;
 188                 /* palette_cmap provides space for only 16 colors at once */
 189                 if (n > 16)
 190                         n = 16;
 191                 palette_cmap.start = 32 + i;
 192                 palette_cmap.len = n;
 193                 for (j = 0; j < n; ++j) {
 194                         palette_cmap.red[j] = clut[0] << 8 | clut[0];
 195                         palette_cmap.green[j] = clut[1] << 8 | clut[1];
 196                         palette_cmap.blue[j] = clut[2] << 8 | clut[2];
 197                         clut += 3;
 198                 }
 199                 fb_set_cmap(&palette_cmap, info);
 200         }
 201 }
 202
 203 static void  fb_set_logo_truepalette(struct fb_info *info,
 204                                             const struct linux_logo *logo,
 205                                             u32 *palette)
 206 {
 207         unsigned char mask[9] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
 208         unsigned char redmask, greenmask, bluemask;
 209         int redshift, greenshift, blueshift;
 210         int i;
 211         const unsigned char *clut = logo->clut;
 212
 213         /*
 214          * We have to create a temporary palette since console palette is only
 215          * 16 colors long.
 216          */
 217         /* Bug: Doesn't obey msb_right ... (who needs that?) */
 218         redmask   = mask[info->var.red.length   < 8 ? info->var.red.length   : 8];
 219         greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
 220         bluemask  = mask[info->var.blue.length  < 8 ? info->var.blue.length  : 8];
 221         redshift   = info->var.red.offset   - (8 - info->var.red.length);
 222         greenshift = info->var.green.offset - (8 - info->var.green.length);
 223         blueshift  = info->var.blue.offset  - (8 - info->var.blue.length);
 224
 225         for ( i = 0; i < logo->clutsize; i++) {
 226                 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
 227                                  safe_shift((clut[1] & greenmask), greenshift) |
 228                                  safe_shift((clut[2] & bluemask), blueshift));
 229                 clut += 3;
 230         }
 231 }
 232
 233 static void fb_set_logo_directpalette(struct fb_info *info,
 234                                              const struct linux_logo *logo,
 235                                              u32 *palette)
 236 {
 237         int redshift, greenshift, blueshift;
 238         int i;
 239
 240         redshift = info->var.red.offset;
 241         greenshift = info->var.green.offset;
 242         blueshift = info->var.blue.offset;
 243
 244         for (i = 32; i < logo->clutsize; i++)
 245                 palette[i] = i << redshift | i << greenshift | i << blueshift;
 246 }
 247
 248 static void fb_set_logo(struct fb_info *info,
 249                                const struct linux_logo *logo, u8 *dst,
 250                                int depth)
 251 {
 252         int i, j, k;
 253         const u8 *src = logo->data;
 254         u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
 255         u8 fg = 1, d;
 256
 257         if (fb_get_color_depth(&info->var, &info->fix) == 3)
 258                 fg = 7;
 259
 260         if (info->fix.visual == FB_VISUAL_MONO01 ||
 261             info->fix.visual == FB_VISUAL_MONO10)
 262                 fg = ~((u8) (0xfff << info->var.green.length));
 263
 264         switch (depth) {
 265         case 4:
 266                 for (i = 0; i < logo->height; i++)
 267                         for (j = 0; j < logo->width; src++) {
 268                                 *dst++ = *src >> 4;
 269                                 j++;
 270                                 if (j < logo->width) {
 271                                         *dst++ = *src & 0x0f;
 272                                         j++;
 273                                 }
 274                         }
 275                 break;
 276         case 1:
 277                 for (i = 0; i < logo->height; i++) {
 278                         for (j = 0; j < logo->width; src++) {
 279                                 d = *src ^ xor;
 280                                 for (k = 7; k >= 0; k--) {
 281                                         *dst++ = ((d >> k) & 1) ? fg : 0;
 282                                         j++;
 283                                 }
 284                         }
 285                 }
 286                 break;
 287         }
 288 }
 289
 290 /*
 291  * Three (3) kinds of logo maps exist.  linux_logo_clut224 (>16 colors),
 292  * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors).  Depending on
 293  * the visual format and color depth of the framebuffer, the DAC, the
 294  * pseudo_palette, and the logo data will be adjusted accordingly.
 295  *
 296  * Case 1 - linux_logo_clut224:
 297  * Color exceeds the number of console colors (16), thus we set the hardware DAC
 298  * using fb_set_cmap() appropriately.  The "needs_cmapreset"  flag will be set.
 299  *
 300  * For visuals that require color info from the pseudo_palette, we also construct
 301  * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
 302  * will be set.
 303  *
 304  * Case 2 - linux_logo_vga16:
 305  * The number of colors just matches the console colors, thus there is no need
 306  * to set the DAC or the pseudo_palette.  However, the bitmap is packed, ie,
 307  * each byte contains color information for two pixels (upper and lower nibble).
 308  * To be consistent with fb_imageblit() usage, we therefore separate the two
 309  * nibbles into separate bytes. The "depth" flag will be set to 4.
 310  *
 311  * Case 3 - linux_logo_mono:
 312  * This is similar with Case 2.  Each byte contains information for 8 pixels.
 313  * We isolate each bit and expand each into a byte. The "depth" flag will
 314  * be set to 1.
 315  */
 316 static struct logo_data {
 317         int depth;
 318         int needs_directpalette;
 319         int needs_truepalette;
 320         int needs_cmapreset;
 321         const struct linux_logo *logo;
 322 } fb_logo;
 323
 324 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
 325 {
 326         u32 size = width * height, i;
 327
 328         out += size - 1;
 329
 330         for (i = size; i--; )
 331                 *out-- = *in++;
 332 }
 333
 334 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
 335 {
 336         int i, j, h = height - 1;
 337
 338         for (i = 0; i < height; i++)
 339                 for (j = 0; j < width; j++)
 340                                 out[height * j + h - i] = *in++;
 341 }
 342
 343 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
 344 {
 345         int i, j, w = width - 1;
 346
 347         for (i = 0; i < height; i++)
 348                 for (j = 0; j < width; j++)
 349                         out[height * (w - j) + i] = *in++;
 350 }
 351
 352 static void fb_rotate_logo(struct fb_info *info, u8 *dst,
 353                            struct fb_image *image, int rotate)
 354 {
 355         u32 tmp;
 356
 357         if (rotate == FB_ROTATE_UD) {
 358                 fb_rotate_logo_ud(image->data, dst, image->width,
 359                                   image->height);
 360                 image->dx = info->var.xres - image->width;
 361                 image->dy = info->var.yres - image->height;
 362         } else if (rotate == FB_ROTATE_CW) {
 363                 fb_rotate_logo_cw(image->data, dst, image->width,
 364                                   image->height);
 365                 tmp = image->width;
 366                 image->width = image->height;
 367                 image->height = tmp;
 368                 image->dx = info->var.xres - image->width;
 369         } else if (rotate == FB_ROTATE_CCW) {
 370                 fb_rotate_logo_ccw(image->data, dst, image->width,
 371                                    image->height);
 372                 tmp = image->width;
 373                 image->width = image->height;
 374                 image->height = tmp;
 375                 image->dy = info->var.yres - image->height;
 376         }
 377
 378         image->data = dst;
 379 }
 380
 381 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
 382                             int rotate)
 383 {
 384         int x;
 385
 386         if (rotate == FB_ROTATE_UR) {
 387                 for (x = 0; x < num_online_cpus() &&
 388                              x * (fb_logo.logo->width + 8) <=
 389                              info->var.xres - fb_logo.logo->width; x++) {
 390                         info->fbops->fb_imageblit(info, image);
 391                         image->dx += fb_logo.logo->width + 8;
 392                 }
 393         } else if (rotate == FB_ROTATE_UD) {
 394                 for (x = 0; x < num_online_cpus() &&
 395                              x * (fb_logo.logo->width + 8) <=
 396                              info->var.xres - fb_logo.logo->width; x++) {
 397                         info->fbops->fb_imageblit(info, image);
 398                         image->dx -= fb_logo.logo->width + 8;
 399                 }
 400         } else if (rotate == FB_ROTATE_CW) {
 401                 for (x = 0; x < num_online_cpus() &&
 402                              x * (fb_logo.logo->width + 8) <=
 403                              info->var.yres - fb_logo.logo->width; x++) {
 404                         info->fbops->fb_imageblit(info, image);
 405                         image->dy += fb_logo.logo->width + 8;
 406                 }
 407         } else if (rotate == FB_ROTATE_CCW) {
 408                 for (x = 0; x < num_online_cpus() &&
 409                              x * (fb_logo.logo->width + 8) <=
 410                              info->var.yres - fb_logo.logo->width; x++) {
 411                         info->fbops->fb_imageblit(info, image);
 412                         image->dy -= fb_logo.logo->width + 8;
 413                 }
 414         }
 415 }
 416
 417 int fb_prepare_logo(struct fb_info *info, int rotate)
 418 {
 419         int depth = fb_get_color_depth(&info->var, &info->fix);
 420         int yres;
 421
 422         memset(&fb_logo, 0, sizeof(struct logo_data));
 423
 424         if (info->flags & FBINFO_MISC_TILEBLITTING)
 425                 return 0;
 426
 427         if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
 428                 depth = info->var.blue.length;
 429                 if (info->var.red.length < depth)
 430                         depth = info->var.red.length;
 431                 if (info->var.green.length < depth)
 432                         depth = info->var.green.length;
 433         }
 434
 435         if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) {
 436                 /* assume console colormap */
 437                 depth = 4;
 438         }
 439
 440         if (depth >= 8) {
 441                 switch (info->fix.visual) {
 442                 case FB_VISUAL_TRUECOLOR:
 443                         fb_logo.needs_truepalette = 1;
 444                         break;
 445                 case FB_VISUAL_DIRECTCOLOR:
 446                         fb_logo.needs_directpalette = 1;
 447                         fb_logo.needs_cmapreset = 1;
 448                         break;
 449                 case FB_VISUAL_PSEUDOCOLOR:
 450                         fb_logo.needs_cmapreset = 1;
 451                         break;
 452                 }
 453         }
 454
 455         /* Return if no suitable logo was found */
 456         fb_logo.logo = fb_find_logo(depth);
 457
 458         if (!fb_logo.logo) {
 459                 return 0;
 460         }
 461
 462         if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
 463                 yres = info->var.yres;
 464         else
 465                 yres = info->var.xres;
 466
 467         if (fb_logo.logo->height > yres) {
 468                 fb_logo.logo = NULL;
 469                 return 0;
 470         }
 471
 472         /* What depth we asked for might be different from what we get */
 473         if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
 474                 fb_logo.depth = 8;
 475         else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
 476                 fb_logo.depth = 4;
 477         else
 478                 fb_logo.depth = 1;
 479         return fb_logo.logo->height;
 480 }
 481
 482 int fb_show_logo(struct fb_info *info, int rotate)
 483 {
 484         u32 *palette = NULL, *saved_pseudo_palette = NULL;
 485         unsigned char *logo_new = NULL, *logo_rotate = NULL;
 486         struct fb_image image;
 487
 488         /* Return if the frame buffer is not mapped or suspended */
 489         if (fb_logo.logo == NULL || info->state != FBINFO_STATE_RUNNING)
 490                 return 0;
 491
 492         image.depth = 8;
 493         image.data = fb_logo.logo->data;
 494
 495         if (fb_logo.needs_cmapreset)
 496                 fb_set_logocmap(info, fb_logo.logo);
 497
 498         if (fb_logo.needs_truepalette ||
 499             fb_logo.needs_directpalette) {
 500                 palette = kmalloc(256 * 4, GFP_KERNEL);
 501                 if (palette == NULL)
 502                         return 0;
 503
 504                 if (fb_logo.needs_truepalette)
 505                         fb_set_logo_truepalette(info, fb_logo.logo, palette);
 506                 else
 507                         fb_set_logo_directpalette(info, fb_logo.logo, palette);
 508
 509                 saved_pseudo_palette = info->pseudo_palette;
 510                 info->pseudo_palette = palette;
 511         }
 512
 513         if (fb_logo.depth <= 4) {
 514                 logo_new = kmalloc(fb_logo.logo->width * fb_logo.logo->height,
 515                                    GFP_KERNEL);
 516                 if (logo_new == NULL) {
 517                         kfree(palette);
 518                         if (saved_pseudo_palette)
 519                                 info->pseudo_palette = saved_pseudo_palette;
 520                         return 0;
 521                 }
 522                 image.data = logo_new;
 523                 fb_set_logo(info, fb_logo.logo, logo_new, fb_logo.depth);
 524         }
 525
 526         image.dx = 0;
 527         image.dy = 0;
 528         image.width = fb_logo.logo->width;
 529         image.height = fb_logo.logo->height;
 530
 531         if (rotate) {
 532                 logo_rotate = kmalloc(fb_logo.logo->width *
 533                                       fb_logo.logo->height, GFP_KERNEL);
 534                 if (logo_rotate)
 535                         fb_rotate_logo(info, logo_rotate, &image, rotate);
 536         }
 537
 538         fb_do_show_logo(info, &image, rotate);
 539
 540         kfree(palette);
 541         if (saved_pseudo_palette != NULL)
 542                 info->pseudo_palette = saved_pseudo_palette;
 543         kfree(logo_new);
 544         kfree(logo_rotate);
 545         return fb_logo.logo->height;
 546 }
 547 #else
 548 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
 549 int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
 550 #endif /* CONFIG_LOGO */
 551
 552 static int fbmem_read_proc(char *buf, char **start, off_t offset,
 553                            int len, int *eof, void *private)
 554 {
 555         struct fb_info **fi;
 556         int clen;
 557
 558         clen = 0;
 559         for (fi = registered_fb; fi < &registered_fb[FB_MAX] && len < 4000; fi++)
 560                 if (*fi)
 561                         clen += sprintf(buf + clen, "%d %s\n",
 562                                         (*fi)->node,
 563                                         (*fi)->fix.id);
 564         *start = buf + offset;
 565         if (clen > offset)
 566                 clen -= offset;
 567         else
 568                 clen = 0;
 569         return clen < len ? clen : len;
 570 }
 571
 572 static ssize_t
 573 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 574 {
 575         unsigned long p = *ppos;
 576         struct inode *inode = file->f_dentry->d_inode;
 577         int fbidx = iminor(inode);
 578         struct fb_info *info = registered_fb[fbidx];
 579         u32 *buffer, *dst;
 580         u32 __iomem *src;
 581         int c, i, cnt = 0, err = 0;
 582         unsigned long total_size;
 583
 584         if (!info || ! info->screen_base)
 585                 return -ENODEV;
 586
 587         if (info->state != FBINFO_STATE_RUNNING)
 588                 return -EPERM;
 589
 590         if (info->fbops->fb_read)
 591                 return info->fbops->fb_read(file, buf, count, ppos);
 592
 593         total_size = info->screen_size;
 594
 595         if (total_size == 0)
 596                 total_size = info->fix.smem_len;
 597
 598         if (p >= total_size)
 599                 return 0;
 600
 601         if (count >= total_size)
 602                 count = total_size;
 603
 604         if (count + p > total_size)
 605                 count = total_size - p;
 606
 607         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 608                          GFP_KERNEL);
 609         if (!buffer)
 610                 return -ENOMEM;
 611
 612         src = (u32 __iomem *) (info->screen_base + p);
 613
 614         if (info->fbops->fb_sync)
 615                 info->fbops->fb_sync(info);
 616
 617         while (count) {
 618                 c  = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 619                 dst = buffer;
 620                 for (i = c >> 2; i--; )
 621                         *dst++ = fb_readl(src++);
 622                 if (c & 3) {
 623                         u8 *dst8 = (u8 *) dst;
 624                         u8 __iomem *src8 = (u8 __iomem *) src;
 625
 626                         for (i = c & 3; i--;)
 627                                 *dst8++ = fb_readb(src8++);
 628
 629                         src = (u32 __iomem *) src8;
 630                 }
 631
 632                 if (copy_to_user(buf, buffer, c)) {
 633                         err = -EFAULT;
 634                         break;
 635                 }
 636                 *ppos += c;
 637                 buf += c;
 638                 cnt += c;
 639                 count -= c;
 640         }
 641
 642         kfree(buffer);
 643
 644         return (err) ? err : cnt;
 645 }
 646
 647 static ssize_t
 648 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 649 {
 650         unsigned long p = *ppos;
 651         struct inode *inode = file->f_dentry->d_inode;
 652         int fbidx = iminor(inode);
 653         struct fb_info *info = registered_fb[fbidx];
 654         u32 *buffer, *src;
 655         u32 __iomem *dst;
 656         int c, i, cnt = 0, err = 0;
 657         unsigned long total_size;
 658
 659         if (!info || !info->screen_base)
 660                 return -ENODEV;
 661
 662         if (info->state != FBINFO_STATE_RUNNING)
 663                 return -EPERM;
 664
 665         if (info->fbops->fb_write)
 666                 return info->fbops->fb_write(file, buf, count, ppos);
 667
 668         total_size = info->screen_size;
 669
 670         if (total_size == 0)
 671                 total_size = info->fix.smem_len;
 672
 673         if (p > total_size)
 674                 return -EFBIG;
 675
 676         if (count > total_size) {
 677                 err = -EFBIG;
 678                 count = total_size;
 679         }
 680
 681         if (count + p > total_size) {
 682                 if (!err)
 683                         err = -ENOSPC;
 684
 685                 count = total_size - p;
 686         }
 687
 688         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 689                          GFP_KERNEL);
 690         if (!buffer)
 691                 return -ENOMEM;
 692
 693         dst = (u32 __iomem *) (info->screen_base + p);
 694
 695         if (info->fbops->fb_sync)
 696                 info->fbops->fb_sync(info);
 697
 698         while (count) {
 699                 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 700                 src = buffer;
 701
 702                 if (copy_from_user(src, buf, c)) {
 703                         err = -EFAULT;
 704                         break;
 705                 }
 706
 707                 for (i = c >> 2; i--; )
 708                         fb_writel(*src++, dst++);
 709
 710                 if (c & 3) {
 711                         u8 *src8 = (u8 *) src;
 712                         u8 __iomem *dst8 = (u8 __iomem *) dst;
 713
 714                         for (i = c & 3; i--; )
 715                                 fb_writeb(*src8++, dst8++);
 716
 717                         dst = (u32 __iomem *) dst8;
 718                 }
 719
 720                 *ppos += c;
 721                 buf += c;
 722                 cnt += c;
 723                 count -= c;
 724         }
 725
 726         kfree(buffer);
 727
 728         return (cnt) ? cnt : err;
 729 }
 730
 731 #ifdef CONFIG_KMOD
 732 static void try_to_load(int fb)
 733 {
 734         request_module("fb%d", fb);
 735 }
 736 #endif /* CONFIG_KMOD */
 737
 738 int
 739 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
 740 {
 741         struct fb_fix_screeninfo *fix = &info->fix;
 742         int xoffset = var->xoffset;
 743         int yoffset = var->yoffset;
 744         int err = 0, yres = info->var.yres;
 745
 746         if (var->yoffset > 0) {
 747                 if (var->vmode & FB_VMODE_YWRAP) {
 748                         if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
 749                                 err = -EINVAL;
 750                         else
 751                                 yres = 0;
 752                 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
 753                         err = -EINVAL;
 754         }
 755
 756         if (var->xoffset > 0 && (!fix->xpanstep ||
 757                                  (var->xoffset % fix->xpanstep)))
 758                 err = -EINVAL;
 759
 760         if (err || !info->fbops->fb_pan_display || xoffset < 0 ||
 761             yoffset < 0 || var->yoffset + yres > info->var.yres_virtual ||
 762             var->xoffset + info->var.xres > info->var.xres_virtual)
 763                 return -EINVAL;
 764
 765         if ((err = info->fbops->fb_pan_display(var, info)))
 766                 return err;
 767         info->var.xoffset = var->xoffset;
 768         info->var.yoffset = var->yoffset;
 769         if (var->vmode & FB_VMODE_YWRAP)
 770                 info->var.vmode |= FB_VMODE_YWRAP;
 771         else
 772                 info->var.vmode &= ~FB_VMODE_YWRAP;
 773         return 0;
 774 }
 775
 776 int
 777 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
 778 {
 779         int err, flags = info->flags;
 780
 781         if (var->activate & FB_ACTIVATE_INV_MODE) {
 782                 struct fb_videomode mode1, mode2;
 783                 int ret = 0;
 784
 785                 fb_var_to_videomode(&mode1, var);
 786                 fb_var_to_videomode(&mode2, &info->var);
 787                 /* make sure we don't delete the videomode of current var */
 788                 ret = fb_mode_is_equal(&mode1, &mode2);
 789
 790                 if (!ret) {
 791                     struct fb_event event;
 792
 793                     event.info = info;
 794                     event.data = &mode1;
 795                     ret = blocking_notifier_call_chain(&fb_notifier_list,
 796                                               FB_EVENT_MODE_DELETE, &event);
 797                 }
 798
 799                 if (!ret)
 800                     fb_delete_videomode(&mode1, &info->modelist);
 801
 802                 return ret;
 803         }
 804
 805         if ((var->activate & FB_ACTIVATE_FORCE) ||
 806             memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
 807                 if (!info->fbops->fb_check_var) {
 808                         *var = info->var;
 809                         return 0;
 810                 }
 811
 812                 if ((err = info->fbops->fb_check_var(var, info)))
 813                         return err;
 814
 815                 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
 816                         struct fb_videomode mode;
 817                         int err = 0;
 818
 819                         info->var = *var;
 820                         if (info->fbops->fb_set_par)
 821                                 info->fbops->fb_set_par(info);
 822
 823                         fb_pan_display(info, &info->var);
 824
 825                         fb_set_cmap(&info->cmap, info);
 826
 827                         fb_var_to_videomode(&mode, &info->var);
 828
 829                         if (info->modelist.prev && info->modelist.next &&
 830                             !list_empty(&info->modelist))
 831                                 err = fb_add_videomode(&mode, &info->modelist);
 832
 833                         if (!err && (flags & FBINFO_MISC_USEREVENT)) {
 834                                 struct fb_event event;
 835                                 int evnt = (var->activate & FB_ACTIVATE_ALL) ?
 836                                         FB_EVENT_MODE_CHANGE_ALL :
 837                                         FB_EVENT_MODE_CHANGE;
 838
 839                                 info->flags &= ~FBINFO_MISC_USEREVENT;
 840                                 event.info = info;
 841                                 blocking_notifier_call_chain(&fb_notifier_list,
 842                                                 evnt, &event);
 843                         }
 844                 }
 845         }
 846         return 0;
 847 }
 848
 849 int
 850 fb_blank(struct fb_info *info, int blank)
 851 {
 852         int ret = -EINVAL;
 853
 854         if (blank > FB_BLANK_POWERDOWN)
 855                 blank = FB_BLANK_POWERDOWN;
 856
 857         if (info->fbops->fb_blank)
 858                 ret = info->fbops->fb_blank(blank, info);
 859
 860         if (!ret) {
 861                 struct fb_event event;
 862
 863                 event.info = info;
 864                 event.data = &blank;
 865                 blocking_notifier_call_chain(&fb_notifier_list,
 866                                 FB_EVENT_BLANK, &event);
 867         }
 868
 869         return ret;
 870 }
 871
 872 static int
 873 fb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
 874          unsigned long arg)
 875 {
 876         int fbidx = iminor(inode);
 877         struct fb_info *info = registered_fb[fbidx];
 878         struct fb_ops *fb = info->fbops;
 879         struct fb_var_screeninfo var;
 880         struct fb_fix_screeninfo fix;
 881         struct fb_con2fbmap con2fb;
 882         struct fb_cmap_user cmap;
 883         struct fb_event event;
 884         void __user *argp = (void __user *)arg;
 885         int i;
 886
 887         if (!fb)
 888                 return -ENODEV;
 889         switch (cmd) {
 890         case FBIOGET_VSCREENINFO:
 891                 return copy_to_user(argp, &info->var,
 892                                     sizeof(var)) ? -EFAULT : 0;
 893         case FBIOPUT_VSCREENINFO:
 894                 if (copy_from_user(&var, argp, sizeof(var)))
 895                         return -EFAULT;
 896                 acquire_console_sem();
 897                 info->flags |= FBINFO_MISC_USEREVENT;
 898                 i = fb_set_var(info, &var);
 899                 info->flags &= ~FBINFO_MISC_USEREVENT;
 900                 release_console_sem();
 901                 if (i) return i;
 902                 if (copy_to_user(argp, &var, sizeof(var)))
 903                         return -EFAULT;
 904                 return 0;
 905         case FBIOGET_FSCREENINFO:
 906                 return copy_to_user(argp, &info->fix,
 907                                     sizeof(fix)) ? -EFAULT : 0;
 908         case FBIOPUTCMAP:
 909                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
 910                         return -EFAULT;
 911                 return (fb_set_user_cmap(&cmap, info));
 912         case FBIOGETCMAP:
 913                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
 914                         return -EFAULT;
 915                 return fb_cmap_to_user(&info->cmap, &cmap);
 916         case FBIOPAN_DISPLAY:
 917                 if (copy_from_user(&var, argp, sizeof(var)))
 918                         return -EFAULT;
 919                 acquire_console_sem();
 920                 i = fb_pan_display(info, &var);
 921                 release_console_sem();
 922                 if (i)
 923                         return i;
 924                 if (copy_to_user(argp, &var, sizeof(var)))
 925                         return -EFAULT;
 926                 return 0;
 927         case FBIO_CURSOR:
 928                 return -EINVAL;
 929         case FBIOGET_CON2FBMAP:
 930                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
 931                         return -EFAULT;
 932                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
 933                     return -EINVAL;
 934                 con2fb.framebuffer = -1;
 935                 event.info = info;
 936                 event.data = &con2fb;
 937                 blocking_notifier_call_chain(&fb_notifier_list,
 938                                     FB_EVENT_GET_CONSOLE_MAP, &event);
 939                 return copy_to_user(argp, &con2fb,
 940                                     sizeof(con2fb)) ? -EFAULT : 0;
 941         case FBIOPUT_CON2FBMAP:
 942                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
 943                         return - EFAULT;
 944                 if (con2fb.console < 0 || con2fb.console > MAX_NR_CONSOLES)
 945                     return -EINVAL;
 946                 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
 947                     return -EINVAL;
 948 #ifdef CONFIG_KMOD
 949                 if (!registered_fb[con2fb.framebuffer])
 950                     try_to_load(con2fb.framebuffer);
 951 #endif /* CONFIG_KMOD */
 952                 if (!registered_fb[con2fb.framebuffer])
 953                     return -EINVAL;
 954                 event.info = info;
 955                 event.data = &con2fb;
 956                 return blocking_notifier_call_chain(&fb_notifier_list,
 957                                            FB_EVENT_SET_CONSOLE_MAP,
 958                                            &event);
 959         case FBIOBLANK:
 960                 acquire_console_sem();
 961                 info->flags |= FBINFO_MISC_USEREVENT;
 962                 i = fb_blank(info, arg);
 963                 info->flags &= ~FBINFO_MISC_USEREVENT;
 964                 release_console_sem();
 965                 return i;
 966         default:
 967                 if (fb->fb_ioctl == NULL)
 968                         return -EINVAL;
 969                 return fb->fb_ioctl(info, cmd, arg);
 970         }
 971 }
 972
 973 #ifdef CONFIG_COMPAT
 974 struct fb_fix_screeninfo32 {
 975         char                    id[16];
 976         compat_caddr_t          smem_start;
 977         u32                     smem_len;
 978         u32                     type;
 979         u32                     type_aux;
 980         u32                     visual;
 981         u16                     xpanstep;
 982         u16                     ypanstep;
 983         u16                     ywrapstep;
 984         u32                     line_length;
 985         compat_caddr_t          mmio_start;
 986         u32                     mmio_len;
 987         u32                     accel;
 988         u16                     reserved[3];
 989 };
 990
 991 struct fb_cmap32 {
 992         u32                     start;
 993         u32                     len;
 994         compat_caddr_t  red;
 995         compat_caddr_t  green;
 996         compat_caddr_t  blue;
 997         compat_caddr_t  transp;
 998 };
 999
1000 static int fb_getput_cmap(struct inode *inode, struct file *file,
1001                         unsigned int cmd, unsigned long arg)
1002 {
1003         struct fb_cmap_user __user *cmap;
1004         struct fb_cmap32 __user *cmap32;
1005         __u32 data;
1006         int err;
1007
1008         cmap = compat_alloc_user_space(sizeof(*cmap));
1009         cmap32 = compat_ptr(arg);
1010
1011         if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1012                 return -EFAULT;
1013
1014         if (get_user(data, &cmap32->red) ||
1015             put_user(compat_ptr(data), &cmap->red) ||
1016             get_user(data, &cmap32->green) ||
1017             put_user(compat_ptr(data), &cmap->green) ||
1018             get_user(data, &cmap32->blue) ||
1019             put_user(compat_ptr(data), &cmap->blue) ||
1020             get_user(data, &cmap32->transp) ||
1021             put_user(compat_ptr(data), &cmap->transp))
1022                 return -EFAULT;
1023
1024         err = fb_ioctl(inode, file, cmd, (unsigned long) cmap);
1025
1026         if (!err) {
1027                 if (copy_in_user(&cmap32->start,
1028                                  &cmap->start,
1029                                  2 * sizeof(__u32)))
1030                         err = -EFAULT;
1031         }
1032         return err;
1033 }
1034
1035 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1036                                   struct fb_fix_screeninfo32 __user *fix32)
1037 {
1038         __u32 data;
1039         int err;
1040
1041         err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1042
1043         data = (__u32) (unsigned long) fix->smem_start;
1044         err |= put_user(data, &fix32->smem_start);
1045
1046         err |= put_user(fix->smem_len, &fix32->smem_len);
1047         err |= put_user(fix->type, &fix32->type);
1048         err |= put_user(fix->type_aux, &fix32->type_aux);
1049         err |= put_user(fix->visual, &fix32->visual);
1050         err |= put_user(fix->xpanstep, &fix32->xpanstep);
1051         err |= put_user(fix->ypanstep, &fix32->ypanstep);
1052         err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1053         err |= put_user(fix->line_length, &fix32->line_length);
1054
1055         data = (__u32) (unsigned long) fix->mmio_start;
1056         err |= put_user(data, &fix32->mmio_start);
1057
1058         err |= put_user(fix->mmio_len, &fix32->mmio_len);
1059         err |= put_user(fix->accel, &fix32->accel);
1060         err |= copy_to_user(fix32->reserved, fix->reserved,
1061                             sizeof(fix->reserved));
1062
1063         return err;
1064 }
1065
1066 static int fb_get_fscreeninfo(struct inode *inode, struct file *file,
1067                                 unsigned int cmd, unsigned long arg)
1068 {
1069         mm_segment_t old_fs;
1070         struct fb_fix_screeninfo fix;
1071         struct fb_fix_screeninfo32 __user *fix32;
1072         int err;
1073
1074         fix32 = compat_ptr(arg);
1075
1076         old_fs = get_fs();
1077         set_fs(KERNEL_DS);
1078         err = fb_ioctl(inode, file, cmd, (unsigned long) &fix);
1079         set_fs(old_fs);
1080
1081         if (!err)
1082                 err = do_fscreeninfo_to_user(&fix, fix32);
1083
1084         return err;
1085 }
1086
1087 static long
1088 fb_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1089 {
1090         struct inode *inode = file->f_dentry->d_inode;
1091         int fbidx = iminor(inode);
1092         struct fb_info *info = registered_fb[fbidx];
1093         struct fb_ops *fb = info->fbops;
1094         long ret = -ENOIOCTLCMD;
1095
1096         lock_kernel();
1097         switch(cmd) {
1098         case FBIOGET_VSCREENINFO:
1099         case FBIOPUT_VSCREENINFO:
1100         case FBIOPAN_DISPLAY:
1101         case FBIOGET_CON2FBMAP:
1102         case FBIOPUT_CON2FBMAP:
1103                 arg = (unsigned long) compat_ptr(arg);
1104         case FBIOBLANK:
1105                 ret = fb_ioctl(inode, file, cmd, arg);
1106                 break;
1107
1108         case FBIOGET_FSCREENINFO:
1109                 ret = fb_get_fscreeninfo(inode, file, cmd, arg);
1110                 break;
1111
1112         case FBIOGETCMAP:
1113         case FBIOPUTCMAP:
1114                 ret = fb_getput_cmap(inode, file, cmd, arg);
1115                 break;
1116
1117         default:
1118                 if (fb->fb_compat_ioctl)
1119                         ret = fb->fb_compat_ioctl(info, cmd, arg);
1120                 break;
1121         }
1122         unlock_kernel();
1123         return ret;
1124 }
1125 #endif
1126
1127 static int
1128 fb_mmap(struct file *file, struct vm_area_struct * vma)
1129 {
1130         int fbidx = iminor(file->f_dentry->d_inode);
1131         struct fb_info *info = registered_fb[fbidx];
1132         struct fb_ops *fb = info->fbops;
1133         unsigned long off;
1134 #if !defined(__sparc__) || defined(__sparc_v9__)
1135         unsigned long start;
1136         u32 len;
1137 #endif
1138
1139         if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
1140                 return -EINVAL;
1141         off = vma->vm_pgoff << PAGE_SHIFT;
1142         if (!fb)
1143                 return -ENODEV;
1144         if (fb->fb_mmap) {
1145                 int res;
1146                 lock_kernel();
1147                 res = fb->fb_mmap(info, vma);
1148                 unlock_kernel();
1149                 return res;
1150         }
1151
1152 #if defined(__sparc__) && !defined(__sparc_v9__)
1153         /* Should never get here, all fb drivers should have their own
1154            mmap routines */
1155         return -EINVAL;
1156 #else
1157         /* !sparc32... */
1158         lock_kernel();
1159
1160         /* frame buffer memory */
1161         start = info->fix.smem_start;
1162         len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
1163         if (off >= len) {
1164                 /* memory mapped io */
1165                 off -= len;
1166                 if (info->var.accel_flags) {
1167                         unlock_kernel();
1168                         return -EINVAL;
1169                 }
1170                 start = info->fix.mmio_start;
1171                 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
1172         }
1173         unlock_kernel();
1174         start &= PAGE_MASK;
1175         if ((vma->vm_end - vma->vm_start + off) > len)
1176                 return -EINVAL;
1177         off += start;
1178         vma->vm_pgoff = off >> PAGE_SHIFT;
1179         /* This is an IO map - tell maydump to skip this VMA */
1180         vma->vm_flags |= VM_IO | VM_RESERVED;
1181 #if defined(__mc68000__)
1182 #if defined(CONFIG_SUN3)
1183         pgprot_val(vma->vm_page_prot) |= SUN3_PAGE_NOCACHE;
1184 #elif defined(CONFIG_MMU)
1185         if (CPU_IS_020_OR_030)
1186                 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE030;
1187         if (CPU_IS_040_OR_060) {
1188                 pgprot_val(vma->vm_page_prot) &= _CACHEMASK040;
1189                 /* Use no-cache mode, serialized */
1190                 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE_S;
1191         }
1192 #endif
1193 #elif defined(__powerpc__)
1194         vma->vm_page_prot = phys_mem_access_prot(file, off >> PAGE_SHIFT,
1195                                                  vma->vm_end - vma->vm_start,
1196                                                  vma->vm_page_prot);
1197 #elif defined(__alpha__)
1198         /* Caching is off in the I/O space quadrant by design.  */
1199 #elif defined(__i386__) || defined(__x86_64__)
1200         if (boot_cpu_data.x86 > 3)
1201                 pgprot_val(vma->vm_page_prot) |= _PAGE_PCD;
1202 #elif defined(__mips__) || defined(__sparc_v9__)
1203         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1204 #elif defined(__hppa__)
1205         pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
1206 #elif defined(__arm__) || defined(__sh__) || defined(__m32r__)
1207         vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
1208 #elif defined(__ia64__)
1209         if (efi_range_is_wc(vma->vm_start, vma->vm_end - vma->vm_start))
1210                 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
1211         else
1212                 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1213 #else
1214 #warning What do we have to do here??
1215 #endif
1216         if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1217                              vma->vm_end - vma->vm_start, vma->vm_page_prot))
1218                 return -EAGAIN;
1219         return 0;
1220 #endif /* !sparc32 */
1221 }
1222
1223 static int
1224 fb_open(struct inode *inode, struct file *file)
1225 {
1226         int fbidx = iminor(inode);
1227         struct fb_info *info;
1228         int res = 0;
1229
1230         if (fbidx >= FB_MAX)
1231                 return -ENODEV;
1232 #ifdef CONFIG_KMOD
1233         if (!(info = registered_fb[fbidx]))
1234                 try_to_load(fbidx);
1235 #endif /* CONFIG_KMOD */
1236         if (!(info = registered_fb[fbidx]))
1237                 return -ENODEV;
1238         if (!try_module_get(info->fbops->owner))
1239                 return -ENODEV;
1240         file->private_data = info;
1241         if (info->fbops->fb_open) {
1242                 res = info->fbops->fb_open(info,1);
1243                 if (res)
1244                         module_put(info->fbops->owner);
1245         }
1246         return res;
1247 }
1248
1249 static int
1250 fb_release(struct inode *inode, struct file *file)
1251 {
1252         struct fb_info * const info = file->private_data;
1253
1254         lock_kernel();
1255         if (info->fbops->fb_release)
1256                 info->fbops->fb_release(info,1);
1257         module_put(info->fbops->owner);
1258         unlock_kernel();
1259         return 0;
1260 }
1261
1262 static struct file_operations fb_fops = {
1263         .owner =        THIS_MODULE,
1264         .read =         fb_read,
1265         .write =        fb_write,
1266         .ioctl =        fb_ioctl,
1267 #ifdef CONFIG_COMPAT
1268         .compat_ioctl = fb_compat_ioctl,
1269 #endif
1270         .mmap =         fb_mmap,
1271         .open =         fb_open,
1272         .release =      fb_release,
1273 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1274         .get_unmapped_area = get_fb_unmapped_area,
1275 #endif
1276 };
1277
1278 struct class *fb_class;
1279 EXPORT_SYMBOL(fb_class);
1280 /**
1281  *      register_framebuffer - registers a frame buffer device
1282  *      @fb_info: frame buffer info structure
1283  *
1284  *      Registers a frame buffer device @fb_info.
1285  *
1286  *      Returns negative errno on error, or zero for success.
1287  *
1288  */
1289
1290 int
1291 register_framebuffer(struct fb_info *fb_info)
1292 {
1293         int i;
1294         struct fb_event event;
1295         struct fb_videomode mode;
1296
1297         if (num_registered_fb == FB_MAX)
1298                 return -ENXIO;
1299         num_registered_fb++;
1300         for (i = 0 ; i < FB_MAX; i++)
1301                 if (!registered_fb[i])
1302                         break;
1303         fb_info->node = i;
1304
1305         fb_info->class_device = class_device_create(fb_class, NULL, MKDEV(FB_MAJOR, i),
1306                                     fb_info->device, "fb%d", i);
1307         if (IS_ERR(fb_info->class_device)) {
1308                 /* Not fatal */
1309                 printk(KERN_WARNING "Unable to create class_device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->class_device));
1310                 fb_info->class_device = NULL;
1311         } else
1312                 fb_init_class_device(fb_info);
1313
1314         if (fb_info->pixmap.addr == NULL) {
1315                 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1316                 if (fb_info->pixmap.addr) {
1317                         fb_info->pixmap.size = FBPIXMAPSIZE;
1318                         fb_info->pixmap.buf_align = 1;
1319                         fb_info->pixmap.scan_align = 1;
1320                         fb_info->pixmap.access_align = 32;
1321                         fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1322                 }
1323         }
1324         fb_info->pixmap.offset = 0;
1325
1326         if (!fb_info->modelist.prev || !fb_info->modelist.next)
1327                 INIT_LIST_HEAD(&fb_info->modelist);
1328
1329         fb_var_to_videomode(&mode, &fb_info->var);
1330         fb_add_videomode(&mode, &fb_info->modelist);
1331         registered_fb[i] = fb_info;
1332
1333         event.info = fb_info;
1334         blocking_notifier_call_chain(&fb_notifier_list,
1335                             FB_EVENT_FB_REGISTERED, &event);
1336         return 0;
1337 }
1338
1339
1340 /**
1341  *      unregister_framebuffer - releases a frame buffer device
1342  *      @fb_info: frame buffer info structure
1343  *
1344  *      Unregisters a frame buffer device @fb_info.
1345  *
1346  *      Returns negative errno on error, or zero for success.
1347  *
1348  */
1349
1350 int
1351 unregister_framebuffer(struct fb_info *fb_info)
1352 {
1353         struct fb_event event;
1354         int i;
1355
1356         i = fb_info->node;
1357         if (!registered_fb[i])
1358                 return -EINVAL;
1359
1360         if (fb_info->pixmap.addr &&
1361             (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1362                 kfree(fb_info->pixmap.addr);
1363         fb_destroy_modelist(&fb_info->modelist);
1364         registered_fb[i]=NULL;
1365         num_registered_fb--;
1366         fb_cleanup_class_device(fb_info);
1367         class_device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1368         event.info = fb_info;
1369         blocking_notifier_call_chain(&fb_notifier_list,
1370                                      FB_EVENT_FB_UNREGISTERED, &event);
1371         return 0;
1372 }
1373
1374 /**
1375  *      fb_register_client - register a client notifier
1376  *      @nb: notifier block to callback on events
1377  */
1378 int fb_register_client(struct notifier_block *nb)
1379 {
1380         return blocking_notifier_chain_register(&fb_notifier_list, nb);
1381 }
1382
1383 /**
1384  *      fb_unregister_client - unregister a client notifier
1385  *      @nb: notifier block to callback on events
1386  */
1387 int fb_unregister_client(struct notifier_block *nb)
1388 {
1389         return blocking_notifier_chain_unregister(&fb_notifier_list, nb);
1390 }
1391
1392 /**
1393  *      fb_set_suspend - low level driver signals suspend
1394  *      @info: framebuffer affected
1395  *      @state: 0 = resuming, !=0 = suspending
1396  *
1397  *      This is meant to be used by low level drivers to
1398  *      signal suspend/resume to the core & clients.
1399  *      It must be called with the console semaphore held
1400  */
1401 void fb_set_suspend(struct fb_info *info, int state)
1402 {
1403         struct fb_event event;
1404
1405         event.info = info;
1406         if (state) {
1407                 blocking_notifier_call_chain(&fb_notifier_list,
1408                                 FB_EVENT_SUSPEND, &event);
1409                 info->state = FBINFO_STATE_SUSPENDED;
1410         } else {
1411                 info->state = FBINFO_STATE_RUNNING;
1412                 blocking_notifier_call_chain(&fb_notifier_list,
1413                                 FB_EVENT_RESUME, &event);
1414         }
1415 }
1416
1417 /**
1418  *      fbmem_init - init frame buffer subsystem
1419  *
1420  *      Initialize the frame buffer subsystem.
1421  *
1422  *      NOTE: This function is _only_ to be called by drivers/char/mem.c.
1423  *
1424  */
1425
1426 static int __init
1427 fbmem_init(void)
1428 {
1429         create_proc_read_entry("fb", 0, NULL, fbmem_read_proc, NULL);
1430
1431         if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1432                 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1433
1434         fb_class = class_create(THIS_MODULE, "graphics");
1435         if (IS_ERR(fb_class)) {
1436                 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1437                 fb_class = NULL;
1438         }
1439         return 0;
1440 }
1441
1442 #ifdef MODULE
1443 module_init(fbmem_init);
1444 static void __exit
1445 fbmem_exit(void)
1446 {
1447         class_destroy(fb_class);
1448         unregister_chrdev(FB_MAJOR, "fb");
1449 }
1450
1451 module_exit(fbmem_exit);
1452 MODULE_LICENSE("GPL");
1453 MODULE_DESCRIPTION("Framebuffer base");
1454 #else
1455 subsys_initcall(fbmem_init);
1456 #endif
1457
1458 int fb_new_modelist(struct fb_info *info)
1459 {
1460         struct fb_event event;
1461         struct fb_var_screeninfo var = info->var;
1462         struct list_head *pos, *n;
1463         struct fb_modelist *modelist;
1464         struct fb_videomode *m, mode;
1465         int err = 1;
1466
1467         list_for_each_safe(pos, n, &info->modelist) {
1468                 modelist = list_entry(pos, struct fb_modelist, list);
1469                 m = &modelist->mode;
1470                 fb_videomode_to_var(&var, m);
1471                 var.activate = FB_ACTIVATE_TEST;
1472                 err = fb_set_var(info, &var);
1473                 fb_var_to_videomode(&mode, &var);
1474                 if (err || !fb_mode_is_equal(m, &mode)) {
1475                         list_del(pos);
1476                         kfree(pos);
1477                 }
1478         }
1479
1480         err = 1;
1481
1482         if (!list_empty(&info->modelist)) {
1483                 event.info = info;
1484                 err = blocking_notifier_call_chain(&fb_notifier_list,
1485                                            FB_EVENT_NEW_MODELIST,
1486                                            &event);
1487         }
1488
1489         return err;
1490 }
1491
1492 static char *video_options[FB_MAX];
1493 static int ofonly;
1494
1495 extern const char *global_mode_option;
1496
1497 /**
1498  * fb_get_options - get kernel boot parameters
1499  * @name:   framebuffer name as it would appear in
1500  *          the boot parameter line
1501  *          (video=<name>:<options>)
1502  * @option: the option will be stored here
1503  *
1504  * NOTE: Needed to maintain backwards compatibility
1505  */
1506 int fb_get_options(char *name, char **option)
1507 {
1508         char *opt, *options = NULL;
1509         int opt_len, retval = 0;
1510         int name_len = strlen(name), i;
1511
1512         if (name_len && ofonly && strncmp(name, "offb", 4))
1513                 retval = 1;
1514
1515         if (name_len && !retval) {
1516                 for (i = 0; i < FB_MAX; i++) {
1517                         if (video_options[i] == NULL)
1518                                 continue;
1519                         opt_len = strlen(video_options[i]);
1520                         if (!opt_len)
1521                                 continue;
1522                         opt = video_options[i];
1523                         if (!strncmp(name, opt, name_len) &&
1524                             opt[name_len] == ':')
1525                                 options = opt + name_len + 1;
1526                 }
1527         }
1528         if (options && !strncmp(options, "off", 3))
1529                 retval = 1;
1530
1531         if (option)
1532                 *option = options;
1533
1534         return retval;
1535 }
1536
1537 #ifndef MODULE
1538 /**
1539  *      video_setup - process command line options
1540  *      @options: string of options
1541  *
1542  *      Process command line options for frame buffer subsystem.
1543  *
1544  *      NOTE: This function is a __setup and __init function.
1545  *            It only stores the options.  Drivers have to call
1546  *            fb_get_options() as necessary.
1547  *
1548  *      Returns zero.
1549  *
1550  */
1551 static int __init video_setup(char *options)
1552 {
1553         int i, global = 0;
1554
1555         if (!options || !*options)
1556                 global = 1;
1557
1558         if (!global && !strncmp(options, "ofonly", 6)) {
1559                 ofonly = 1;
1560                 global = 1;
1561         }
1562
1563         if (!global && !strstr(options, "fb:")) {
1564                 global_mode_option = options;
1565                 global = 1;
1566         }
1567
1568         if (!global) {
1569                 for (i = 0; i < FB_MAX; i++) {
1570                         if (video_options[i] == NULL) {
1571                                 video_options[i] = options;
1572                                 break;
1573                         }
1574
1575                 }
1576         }
1577
1578         return 1;
1579 }
1580 __setup("video=", video_setup);
1581 #endif
1582
1583     /*
1584      *  Visible symbols for modules
1585      */
1586
1587 EXPORT_SYMBOL(register_framebuffer);
1588 EXPORT_SYMBOL(unregister_framebuffer);
1589 EXPORT_SYMBOL(num_registered_fb);
1590 EXPORT_SYMBOL(registered_fb);
1591 EXPORT_SYMBOL(fb_prepare_logo);
1592 EXPORT_SYMBOL(fb_show_logo);
1593 EXPORT_SYMBOL(fb_set_var);
1594 EXPORT_SYMBOL(fb_blank);
1595 EXPORT_SYMBOL(fb_pan_display);
1596 EXPORT_SYMBOL(fb_get_buffer_offset);
1597 EXPORT_SYMBOL(fb_set_suspend);
1598 EXPORT_SYMBOL(fb_register_client);
1599 EXPORT_SYMBOL(fb_unregister_client);
1600 EXPORT_SYMBOL(fb_get_options);
1601
1602 MODULE_LICENSE("GPL");