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/devfs_fs_kernel.h>
  36 #include <linux/err.h>
  37 #include <linux/kernel.h>
  38 #include <linux/device.h>
  39 #include <linux/efi.h>
  40
  41 #if defined(__mc68000__) || defined(CONFIG_APUS)
  42 #include <asm/setup.h>
  43 #endif
  44
  45 #include <asm/io.h>
  46 #include <asm/uaccess.h>
  47 #include <asm/page.h>
  48 #include <asm/pgtable.h>
  49
  50 #include <linux/fb.h>
  51
  52     /*
  53      *  Frame buffer device initialization and setup routines
  54      */
  55
  56 #define FBPIXMAPSIZE    (1024 * 8)
  57
  58 static BLOCKING_NOTIFIER_HEAD(fb_notifier_list);
  59 struct fb_info *registered_fb[FB_MAX];
  60 int num_registered_fb;
  61
  62 /*
  63  * Helpers
  64  */
  65
  66 int fb_get_color_depth(struct fb_var_screeninfo *var,
  67                        struct fb_fix_screeninfo *fix)
  68 {
  69         int depth = 0;
  70
  71         if (fix->visual == FB_VISUAL_MONO01 ||
  72             fix->visual == FB_VISUAL_MONO10)
  73                 depth = 1;
  74         else {
  75                 if (var->green.length == var->blue.length &&
  76                     var->green.length == var->red.length &&
  77                     var->green.offset == var->blue.offset &&
  78                     var->green.offset == var->red.offset)
  79                         depth = var->green.length;
  80                 else
  81                         depth = var->green.length + var->red.length +
  82                                 var->blue.length;
  83         }
  84
  85         return depth;
  86 }
  87 EXPORT_SYMBOL(fb_get_color_depth);
  88
  89 /*
  90  * Data padding functions.
  91  */
  92 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
  93 {
  94         __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
  95 }
  96 EXPORT_SYMBOL(fb_pad_aligned_buffer);
  97
  98 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
  99                                 u32 shift_high, u32 shift_low, u32 mod)
 100 {
 101         u8 mask = (u8) (0xfff << shift_high), tmp;
 102         int i, j;
 103
 104         for (i = height; i--; ) {
 105                 for (j = 0; j < idx; j++) {
 106                         tmp = dst[j];
 107                         tmp &= mask;
 108                         tmp |= *src >> shift_low;
 109                         dst[j] = tmp;
 110                         tmp = *src << shift_high;
 111                         dst[j+1] = tmp;
 112                         src++;
 113                 }
 114                 tmp = dst[idx];
 115                 tmp &= mask;
 116                 tmp |= *src >> shift_low;
 117                 dst[idx] = tmp;
 118                 if (shift_high < mod) {
 119                         tmp = *src << shift_high;
 120                         dst[idx+1] = tmp;
 121                 }
 122                 src++;
 123                 dst += d_pitch;
 124         }
 125 }
 126 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
 127
 128 /*
 129  * we need to lock this section since fb_cursor
 130  * may use fb_imageblit()
 131  */
 132 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
 133 {
 134         u32 align = buf->buf_align - 1, offset;
 135         char *addr = buf->addr;
 136
 137         /* If IO mapped, we need to sync before access, no sharing of
 138          * the pixmap is done
 139          */
 140         if (buf->flags & FB_PIXMAP_IO) {
 141                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 142                         info->fbops->fb_sync(info);
 143                 return addr;
 144         }
 145
 146         /* See if we fit in the remaining pixmap space */
 147         offset = buf->offset + align;
 148         offset &= ~align;
 149         if (offset + size > buf->size) {
 150                 /* We do not fit. In order to be able to re-use the buffer,
 151                  * we must ensure no asynchronous DMA'ing or whatever operation
 152                  * is in progress, we sync for that.
 153                  */
 154                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 155                         info->fbops->fb_sync(info);
 156                 offset = 0;
 157         }
 158         buf->offset = offset + size;
 159         addr += offset;
 160
 161         return addr;
 162 }
 163
 164 #ifdef CONFIG_LOGO
 165 #include <linux/linux_logo.h>
 166
 167 static inline unsigned safe_shift(unsigned d, int n)
 168 {
 169         return n < 0 ? d >> -n : d << n;
 170 }
 171
 172 static void fb_set_logocmap(struct fb_info *info,
 173                                    const struct linux_logo *logo)
 174 {
 175         struct fb_cmap palette_cmap;
 176         u16 palette_green[16];
 177         u16 palette_blue[16];
 178         u16 palette_red[16];
 179         int i, j, n;
 180         const unsigned char *clut = logo->clut;
 181
 182         palette_cmap.start = 0;
 183         palette_cmap.len = 16;
 184         palette_cmap.red = palette_red;
 185         palette_cmap.green = palette_green;
 186         palette_cmap.blue = palette_blue;
 187         palette_cmap.transp = NULL;
 188
 189         for (i = 0; i < logo->clutsize; i += n) {
 190                 n = logo->clutsize - i;
 191                 /* palette_cmap provides space for only 16 colors at once */
 192                 if (n > 16)
 193                         n = 16;
 194                 palette_cmap.start = 32 + i;
 195                 palette_cmap.len = n;
 196                 for (j = 0; j < n; ++j) {
 197                         palette_cmap.red[j] = clut[0] << 8 | clut[0];
 198                         palette_cmap.green[j] = clut[1] << 8 | clut[1];
 199                         palette_cmap.blue[j] = clut[2] << 8 | clut[2];
 200                         clut += 3;
 201                 }
 202                 fb_set_cmap(&palette_cmap, info);
 203         }
 204 }
 205
 206 static void  fb_set_logo_truepalette(struct fb_info *info,
 207                                             const struct linux_logo *logo,
 208                                             u32 *palette)
 209 {
 210         unsigned char mask[9] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
 211         unsigned char redmask, greenmask, bluemask;
 212         int redshift, greenshift, blueshift;
 213         int i;
 214         const unsigned char *clut = logo->clut;
 215
 216         /*
 217          * We have to create a temporary palette since console palette is only
 218          * 16 colors long.
 219          */
 220         /* Bug: Doesn't obey msb_right ... (who needs that?) */
 221         redmask   = mask[info->var.red.length   < 8 ? info->var.red.length   : 8];
 222         greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
 223         bluemask  = mask[info->var.blue.length  < 8 ? info->var.blue.length  : 8];
 224         redshift   = info->var.red.offset   - (8 - info->var.red.length);
 225         greenshift = info->var.green.offset - (8 - info->var.green.length);
 226         blueshift  = info->var.blue.offset  - (8 - info->var.blue.length);
 227
 228         for ( i = 0; i < logo->clutsize; i++) {
 229                 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
 230                                  safe_shift((clut[1] & greenmask), greenshift) |
 231                                  safe_shift((clut[2] & bluemask), blueshift));
 232                 clut += 3;
 233         }
 234 }
 235
 236 static void fb_set_logo_directpalette(struct fb_info *info,
 237                                              const struct linux_logo *logo,
 238                                              u32 *palette)
 239 {
 240         int redshift, greenshift, blueshift;
 241         int i;
 242
 243         redshift = info->var.red.offset;
 244         greenshift = info->var.green.offset;
 245         blueshift = info->var.blue.offset;
 246
 247         for (i = 32; i < logo->clutsize; i++)
 248                 palette[i] = i << redshift | i << greenshift | i << blueshift;
 249 }
 250
 251 static void fb_set_logo(struct fb_info *info,
 252                                const struct linux_logo *logo, u8 *dst,
 253                                int depth)
 254 {
 255         int i, j, k;
 256         const u8 *src = logo->data;
 257         u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
 258         u8 fg = 1, d;
 259
 260         if (fb_get_color_depth(&info->var, &info->fix) == 3)
 261                 fg = 7;
 262
 263         if (info->fix.visual == FB_VISUAL_MONO01 ||
 264             info->fix.visual == FB_VISUAL_MONO10)
 265                 fg = ~((u8) (0xfff << info->var.green.length));
 266
 267         switch (depth) {
 268         case 4:
 269                 for (i = 0; i < logo->height; i++)
 270                         for (j = 0; j < logo->width; src++) {
 271                                 *dst++ = *src >> 4;
 272                                 j++;
 273                                 if (j < logo->width) {
 274                                         *dst++ = *src & 0x0f;
 275                                         j++;
 276                                 }
 277                         }
 278                 break;
 279         case 1:
 280                 for (i = 0; i < logo->height; i++) {
 281                         for (j = 0; j < logo->width; src++) {
 282                                 d = *src ^ xor;
 283                                 for (k = 7; k >= 0; k--) {
 284                                         *dst++ = ((d >> k) & 1) ? fg : 0;
 285                                         j++;
 286                                 }
 287                         }
 288                 }
 289                 break;
 290         }
 291 }
 292
 293 /*
 294  * Three (3) kinds of logo maps exist.  linux_logo_clut224 (>16 colors),
 295  * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors).  Depending on
 296  * the visual format and color depth of the framebuffer, the DAC, the
 297  * pseudo_palette, and the logo data will be adjusted accordingly.
 298  *
 299  * Case 1 - linux_logo_clut224:
 300  * Color exceeds the number of console colors (16), thus we set the hardware DAC
 301  * using fb_set_cmap() appropriately.  The "needs_cmapreset"  flag will be set.
 302  *
 303  * For visuals that require color info from the pseudo_palette, we also construct
 304  * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
 305  * will be set.
 306  *
 307  * Case 2 - linux_logo_vga16:
 308  * The number of colors just matches the console colors, thus there is no need
 309  * to set the DAC or the pseudo_palette.  However, the bitmap is packed, ie,
 310  * each byte contains color information for two pixels (upper and lower nibble).
 311  * To be consistent with fb_imageblit() usage, we therefore separate the two
 312  * nibbles into separate bytes. The "depth" flag will be set to 4.
 313  *
 314  * Case 3 - linux_logo_mono:
 315  * This is similar with Case 2.  Each byte contains information for 8 pixels.
 316  * We isolate each bit and expand each into a byte. The "depth" flag will
 317  * be set to 1.
 318  */
 319 static struct logo_data {
 320         int depth;
 321         int needs_directpalette;
 322         int needs_truepalette;
 323         int needs_cmapreset;
 324         const struct linux_logo *logo;
 325 } fb_logo;
 326
 327 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
 328 {
 329         u32 size = width * height, i;
 330
 331         out += size - 1;
 332
 333         for (i = size; i--; )
 334                 *out-- = *in++;
 335 }
 336
 337 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
 338 {
 339         int i, j, w = width - 1;
 340
 341         for (i = 0; i < height; i++)
 342                 for (j = 0; j < width; j++)
 343                         out[height * j + w - i] = *in++;
 344 }
 345
 346 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
 347 {
 348         int i, j, w = width - 1;
 349
 350         for (i = 0; i < height; i++)
 351                 for (j = 0; j < width; j++)
 352                         out[height * (w - j) + i] = *in++;
 353 }
 354
 355 static void fb_rotate_logo(struct fb_info *info, u8 *dst,
 356                            struct fb_image *image, int rotate)
 357 {
 358         u32 tmp;
 359
 360         if (rotate == FB_ROTATE_UD) {
 361                 image->dx = info->var.xres - image->width;
 362                 image->dy = info->var.yres - image->height;
 363                 fb_rotate_logo_ud(image->data, dst, image->width,
 364                                   image->height);
 365         } else if (rotate == FB_ROTATE_CW) {
 366                 tmp = image->width;
 367                 image->width = image->height;
 368                 image->height = tmp;
 369                 image->dx = info->var.xres - image->height;
 370                 fb_rotate_logo_cw(image->data, dst, image->width,
 371                                   image->height);
 372         } else if (rotate == FB_ROTATE_CCW) {
 373                 tmp = image->width;
 374                 image->width = image->height;
 375                 image->height = tmp;
 376                 image->dy = info->var.yres - image->width;
 377                 fb_rotate_logo_ccw(image->data, dst, image->width,
 378                                    image->height);
 379         }
 380
 381         image->data = dst;
 382 }
 383
 384 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
 385                             int rotate)
 386 {
 387         int x;
 388
 389         if (rotate == FB_ROTATE_UR) {
 390                 for (x = 0; x < num_online_cpus() &&
 391                              x * (fb_logo.logo->width + 8) <=
 392                              info->var.xres - fb_logo.logo->width; x++) {
 393                         info->fbops->fb_imageblit(info, image);
 394                         image->dx += fb_logo.logo->width + 8;
 395                 }
 396         } else if (rotate == FB_ROTATE_UD) {
 397                 for (x = 0; x < num_online_cpus() &&
 398                              x * (fb_logo.logo->width + 8) <=
 399                              info->var.xres - fb_logo.logo->width; x++) {
 400                         info->fbops->fb_imageblit(info, image);
 401                         image->dx -= fb_logo.logo->width + 8;
 402                 }
 403         } else if (rotate == FB_ROTATE_CW) {
 404                 for (x = 0; x < num_online_cpus() &&
 405                              x * (fb_logo.logo->width + 8) <=
 406                              info->var.yres - fb_logo.logo->width; x++) {
 407                         info->fbops->fb_imageblit(info, image);
 408                         image->dy += fb_logo.logo->width + 8;
 409                 }
 410         } else if (rotate == FB_ROTATE_CCW) {
 411                 for (x = 0; x < num_online_cpus() &&
 412                              x * (fb_logo.logo->width + 8) <=
 413                              info->var.yres - fb_logo.logo->width; x++) {
 414                         info->fbops->fb_imageblit(info, image);
 415                         image->dy -= fb_logo.logo->width + 8;
 416                 }
 417         }
 418 }
 419
 420 int fb_prepare_logo(struct fb_info *info, int rotate)
 421 {
 422         int depth = fb_get_color_depth(&info->var, &info->fix);
 423         int yres;
 424
 425         memset(&fb_logo, 0, sizeof(struct logo_data));
 426
 427         if (info->flags & FBINFO_MISC_TILEBLITTING)
 428                 return 0;
 429
 430         if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
 431                 depth = info->var.blue.length;
 432                 if (info->var.red.length < depth)
 433                         depth = info->var.red.length;
 434                 if (info->var.green.length < depth)
 435                         depth = info->var.green.length;
 436         }
 437
 438         if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR) {
 439                 /* assume console colormap */
 440                 depth = 4;
 441         }
 442
 443         if (depth >= 8) {
 444                 switch (info->fix.visual) {
 445                 case FB_VISUAL_TRUECOLOR:
 446                         fb_logo.needs_truepalette = 1;
 447                         break;
 448                 case FB_VISUAL_DIRECTCOLOR:
 449                         fb_logo.needs_directpalette = 1;
 450                         fb_logo.needs_cmapreset = 1;
 451                         break;
 452                 case FB_VISUAL_PSEUDOCOLOR:
 453                         fb_logo.needs_cmapreset = 1;
 454                         break;
 455                 }
 456         }
 457
 458         /* Return if no suitable logo was found */
 459         fb_logo.logo = fb_find_logo(depth);
 460
 461         if (!fb_logo.logo) {
 462                 return 0;
 463         }
 464
 465         if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
 466                 yres = info->var.yres;
 467         else
 468                 yres = info->var.xres;
 469
 470         if (fb_logo.logo->height > yres) {
 471                 fb_logo.logo = NULL;
 472                 return 0;
 473         }
 474
 475         /* What depth we asked for might be different from what we get */
 476         if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
 477                 fb_logo.depth = 8;
 478         else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
 479                 fb_logo.depth = 4;
 480         else
 481                 fb_logo.depth = 1;
 482         return fb_logo.logo->height;
 483 }
 484
 485 int fb_show_logo(struct fb_info *info, int rotate)
 486 {
 487         u32 *palette = NULL, *saved_pseudo_palette = NULL;
 488         unsigned char *logo_new = NULL, *logo_rotate = NULL;
 489         struct fb_image image;
 490
 491         /* Return if the frame buffer is not mapped or suspended */
 492         if (fb_logo.logo == NULL || info->state != FBINFO_STATE_RUNNING)
 493                 return 0;
 494
 495         image.depth = 8;
 496         image.data = fb_logo.logo->data;
 497
 498         if (fb_logo.needs_cmapreset)
 499                 fb_set_logocmap(info, fb_logo.logo);
 500
 501         if (fb_logo.needs_truepalette ||
 502             fb_logo.needs_directpalette) {
 503                 palette = kmalloc(256 * 4, GFP_KERNEL);
 504                 if (palette == NULL)
 505                         return 0;
 506
 507                 if (fb_logo.needs_truepalette)
 508                         fb_set_logo_truepalette(info, fb_logo.logo, palette);
 509                 else
 510                         fb_set_logo_directpalette(info, fb_logo.logo, palette);
 511
 512                 saved_pseudo_palette = info->pseudo_palette;
 513                 info->pseudo_palette = palette;
 514         }
 515
 516         if (fb_logo.depth <= 4) {
 517                 logo_new = kmalloc(fb_logo.logo->width * fb_logo.logo->height,
 518                                    GFP_KERNEL);
 519                 if (logo_new == NULL) {
 520                         kfree(palette);
 521                         if (saved_pseudo_palette)
 522                                 info->pseudo_palette = saved_pseudo_palette;
 523                         return 0;
 524                 }
 525                 image.data = logo_new;
 526                 fb_set_logo(info, fb_logo.logo, logo_new, fb_logo.depth);
 527         }
 528
 529         image.dx = 0;
 530         image.dy = 0;
 531         image.width = fb_logo.logo->width;
 532         image.height = fb_logo.logo->height;
 533
 534         if (rotate) {
 535                 logo_rotate = kmalloc(fb_logo.logo->width *
 536                                       fb_logo.logo->height, GFP_KERNEL);
 537                 if (logo_rotate)
 538                         fb_rotate_logo(info, logo_rotate, &image, rotate);
 539         }
 540
 541         fb_do_show_logo(info, &image, rotate);
 542
 543         kfree(palette);
 544         if (saved_pseudo_palette != NULL)
 545                 info->pseudo_palette = saved_pseudo_palette;
 546         kfree(logo_new);
 547         kfree(logo_rotate);
 548         return fb_logo.logo->height;
 549 }
 550 #else
 551 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
 552 int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
 553 #endif /* CONFIG_LOGO */
 554
 555 static int fbmem_read_proc(char *buf, char **start, off_t offset,
 556                            int len, int *eof, void *private)
 557 {
 558         struct fb_info **fi;
 559         int clen;
 560
 561         clen = 0;
 562         for (fi = registered_fb; fi < &registered_fb[FB_MAX] && len < 4000; fi++)
 563                 if (*fi)
 564                         clen += sprintf(buf + clen, "%d %s\n",
 565                                         (*fi)->node,
 566                                         (*fi)->fix.id);
 567         *start = buf + offset;
 568         if (clen > offset)
 569                 clen -= offset;
 570         else
 571                 clen = 0;
 572         return clen < len ? clen : len;
 573 }
 574
 575 static ssize_t
 576 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 577 {
 578         unsigned long p = *ppos;
 579         struct inode *inode = file->f_dentry->d_inode;
 580         int fbidx = iminor(inode);
 581         struct fb_info *info = registered_fb[fbidx];
 582         u32 *buffer, *dst;
 583         u32 __iomem *src;
 584         int c, i, cnt = 0, err = 0;
 585         unsigned long total_size;
 586
 587         if (!info || ! info->screen_base)
 588                 return -ENODEV;
 589
 590         if (info->state != FBINFO_STATE_RUNNING)
 591                 return -EPERM;
 592
 593         if (info->fbops->fb_read)
 594                 return info->fbops->fb_read(file, buf, count, ppos);
 595
 596         total_size = info->screen_size;
 597
 598         if (total_size == 0)
 599                 total_size = info->fix.smem_len;
 600
 601         if (p >= total_size)
 602                 return 0;
 603
 604         if (count >= total_size)
 605                 count = total_size;
 606
 607         if (count + p > total_size)
 608                 count = total_size - p;
 609
 610         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 611                          GFP_KERNEL);
 612         if (!buffer)
 613                 return -ENOMEM;
 614
 615         src = (u32 __iomem *) (info->screen_base + p);
 616
 617         if (info->fbops->fb_sync)
 618                 info->fbops->fb_sync(info);
 619
 620         while (count) {
 621                 c  = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 622                 dst = buffer;
 623                 for (i = c >> 2; i--; )
 624                         *dst++ = fb_readl(src++);
 625                 if (c & 3) {
 626                         u8 *dst8 = (u8 *) dst;
 627                         u8 __iomem *src8 = (u8 __iomem *) src;
 628
 629                         for (i = c & 3; i--;)
 630                                 *dst8++ = fb_readb(src8++);
 631
 632                         src = (u32 __iomem *) src8;
 633                 }
 634
 635                 if (copy_to_user(buf, buffer, c)) {
 636                         err = -EFAULT;
 637                         break;
 638                 }
 639                 *ppos += c;
 640                 buf += c;
 641                 cnt += c;
 642                 count -= c;
 643         }
 644
 645         kfree(buffer);
 646
 647         return (err) ? err : cnt;
 648 }
 649
 650 static ssize_t
 651 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 652 {
 653         unsigned long p = *ppos;
 654         struct inode *inode = file->f_dentry->d_inode;
 655         int fbidx = iminor(inode);
 656         struct fb_info *info = registered_fb[fbidx];
 657         u32 *buffer, *src;
 658         u32 __iomem *dst;
 659         int c, i, cnt = 0, err = 0;
 660         unsigned long total_size;
 661
 662         if (!info || !info->screen_base)
 663                 return -ENODEV;
 664
 665         if (info->state != FBINFO_STATE_RUNNING)
 666                 return -EPERM;
 667
 668         if (info->fbops->fb_write)
 669                 return info->fbops->fb_write(file, buf, count, ppos);
 670
 671         total_size = info->screen_size;
 672
 673         if (total_size == 0)
 674                 total_size = info->fix.smem_len;
 675
 676         if (p > total_size)
 677                 return -EFBIG;
 678
 679         if (count > total_size) {
 680                 err = -EFBIG;
 681                 count = total_size;
 682         }
 683
 684         if (count + p > total_size) {
 685                 if (!err)
 686                         err = -ENOSPC;
 687
 688                 count = total_size - p;
 689         }
 690
 691         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 692                          GFP_KERNEL);
 693         if (!buffer)
 694                 return -ENOMEM;
 695
 696         dst = (u32 __iomem *) (info->screen_base + p);
 697
 698         if (info->fbops->fb_sync)
 699                 info->fbops->fb_sync(info);
 700
 701         while (count) {
 702                 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 703                 src = buffer;
 704
 705                 if (copy_from_user(src, buf, c)) {
 706                         err = -EFAULT;
 707                         break;
 708                 }
 709
 710                 for (i = c >> 2; i--; )
 711                         fb_writel(*src++, dst++);
 712
 713                 if (c & 3) {
 714                         u8 *src8 = (u8 *) src;
 715                         u8 __iomem *dst8 = (u8 __iomem *) dst;
 716
 717                         for (i = c & 3; i--; )
 718                                 fb_writeb(*src8++, dst8++);
 719
 720                         dst = (u32 __iomem *) dst8;
 721                 }
 722
 723                 *ppos += c;
 724                 buf += c;
 725                 cnt += c;
 726                 count -= c;
 727         }
 728
 729         kfree(buffer);
 730
 731         return (cnt) ? cnt : err;
 732 }
 733
 734 #ifdef CONFIG_KMOD
 735 static void try_to_load(int fb)
 736 {
 737         request_module("fb%d", fb);
 738 }
 739 #endif /* CONFIG_KMOD */
 740
 741 int
 742 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
 743 {
 744         struct fb_fix_screeninfo *fix = &info->fix;
 745         int xoffset = var->xoffset;
 746         int yoffset = var->yoffset;
 747         int err = 0, yres = info->var.yres;
 748
 749         if (var->yoffset > 0) {
 750                 if (var->vmode & FB_VMODE_YWRAP) {
 751                         if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
 752                                 err = -EINVAL;
 753                         else
 754                                 yres = 0;
 755                 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
 756                         err = -EINVAL;
 757         }
 758
 759         if (var->xoffset > 0 && (!fix->xpanstep ||
 760                                  (var->xoffset % fix->xpanstep)))
 761                 err = -EINVAL;
 762
 763         if (err || !info->fbops->fb_pan_display || xoffset < 0 ||
 764             yoffset < 0 || var->yoffset + yres > info->var.yres_virtual ||
 765             var->xoffset + info->var.xres > info->var.xres_virtual)
 766                 return -EINVAL;
 767
 768         if ((err = info->fbops->fb_pan_display(var, info)))
 769                 return err;
 770         info->var.xoffset = var->xoffset;
 771         info->var.yoffset = var->yoffset;
 772         if (var->vmode & FB_VMODE_YWRAP)
 773                 info->var.vmode |= FB_VMODE_YWRAP;
 774         else
 775                 info->var.vmode &= ~FB_VMODE_YWRAP;
 776         return 0;
 777 }
 778
 779 int
 780 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
 781 {
 782         int err, flags = info->flags;
 783
 784         if (var->activate & FB_ACTIVATE_INV_MODE) {
 785                 struct fb_videomode mode1, mode2;
 786                 int ret = 0;
 787
 788                 fb_var_to_videomode(&mode1, var);
 789                 fb_var_to_videomode(&mode2, &info->var);
 790                 /* make sure we don't delete the videomode of current var */
 791                 ret = fb_mode_is_equal(&mode1, &mode2);
 792
 793                 if (!ret) {
 794                     struct fb_event event;
 795
 796                     event.info = info;
 797                     event.data = &mode1;
 798                     ret = blocking_notifier_call_chain(&fb_notifier_list,
 799                                               FB_EVENT_MODE_DELETE, &event);
 800                 }
 801
 802                 if (!ret)
 803                     fb_delete_videomode(&mode1, &info->modelist);
 804
 805                 return ret;
 806         }
 807
 808         if ((var->activate & FB_ACTIVATE_FORCE) ||
 809             memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
 810                 if (!info->fbops->fb_check_var) {
 811                         *var = info->var;
 812                         return 0;
 813                 }
 814
 815                 if ((err = info->fbops->fb_check_var(var, info)))
 816                         return err;
 817
 818                 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
 819                         struct fb_videomode mode;
 820                         int err = 0;
 821
 822                         info->var = *var;
 823                         if (info->fbops->fb_set_par)
 824                                 info->fbops->fb_set_par(info);
 825
 826                         fb_pan_display(info, &info->var);
 827
 828                         fb_set_cmap(&info->cmap, info);
 829
 830                         fb_var_to_videomode(&mode, &info->var);
 831
 832                         if (info->modelist.prev && info->modelist.next &&
 833                             !list_empty(&info->modelist))
 834                                 err = fb_add_videomode(&mode, &info->modelist);
 835
 836                         if (!err && (flags & FBINFO_MISC_USEREVENT)) {
 837                                 struct fb_event event;
 838                                 int evnt = (var->activate & FB_ACTIVATE_ALL) ?
 839                                         FB_EVENT_MODE_CHANGE_ALL :
 840                                         FB_EVENT_MODE_CHANGE;
 841
 842                                 info->flags &= ~FBINFO_MISC_USEREVENT;
 843                                 event.info = info;
 844                                 blocking_notifier_call_chain(&fb_notifier_list,
 845                                                 evnt, &event);
 846                         }
 847                 }
 848         }
 849         return 0;
 850 }
 851
 852 int
 853 fb_blank(struct fb_info *info, int blank)
 854 {
 855         int ret = -EINVAL;
 856
 857         if (blank > FB_BLANK_POWERDOWN)
 858                 blank = FB_BLANK_POWERDOWN;
 859
 860         if (info->fbops->fb_blank)
 861                 ret = info->fbops->fb_blank(blank, info);
 862
 863         if (!ret) {
 864                 struct fb_event event;
 865
 866                 event.info = info;
 867                 event.data = &blank;
 868                 blocking_notifier_call_chain(&fb_notifier_list,
 869                                 FB_EVENT_BLANK, &event);
 870         }
 871
 872         return ret;
 873 }
 874
 875 static int
 876 fb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
 877          unsigned long arg)
 878 {
 879         int fbidx = iminor(inode);
 880         struct fb_info *info = registered_fb[fbidx];
 881         struct fb_ops *fb = info->fbops;
 882         struct fb_var_screeninfo var;
 883         struct fb_fix_screeninfo fix;
 884         struct fb_con2fbmap con2fb;
 885         struct fb_cmap_user cmap;
 886         struct fb_event event;
 887         void __user *argp = (void __user *)arg;
 888         int i;
 889
 890         if (!fb)
 891                 return -ENODEV;
 892         switch (cmd) {
 893         case FBIOGET_VSCREENINFO:
 894                 return copy_to_user(argp, &info->var,
 895                                     sizeof(var)) ? -EFAULT : 0;
 896         case FBIOPUT_VSCREENINFO:
 897                 if (copy_from_user(&var, argp, sizeof(var)))
 898                         return -EFAULT;
 899                 acquire_console_sem();
 900                 info->flags |= FBINFO_MISC_USEREVENT;
 901                 i = fb_set_var(info, &var);
 902                 info->flags &= ~FBINFO_MISC_USEREVENT;
 903                 release_console_sem();
 904                 if (i) return i;
 905                 if (copy_to_user(argp, &var, sizeof(var)))
 906                         return -EFAULT;
 907                 return 0;
 908         case FBIOGET_FSCREENINFO:
 909                 return copy_to_user(argp, &info->fix,
 910                                     sizeof(fix)) ? -EFAULT : 0;
 911         case FBIOPUTCMAP:
 912                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
 913                         return -EFAULT;
 914                 return (fb_set_user_cmap(&cmap, info));
 915         case FBIOGETCMAP:
 916                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
 917                         return -EFAULT;
 918                 return fb_cmap_to_user(&info->cmap, &cmap);
 919         case FBIOPAN_DISPLAY:
 920                 if (copy_from_user(&var, argp, sizeof(var)))
 921                         return -EFAULT;
 922                 acquire_console_sem();
 923                 i = fb_pan_display(info, &var);
 924                 release_console_sem();
 925                 if (i)
 926                         return i;
 927                 if (copy_to_user(argp, &var, sizeof(var)))
 928                         return -EFAULT;
 929                 return 0;
 930         case FBIO_CURSOR:
 931                 return -EINVAL;
 932         case FBIOGET_CON2FBMAP:
 933                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
 934                         return -EFAULT;
 935                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
 936                     return -EINVAL;
 937                 con2fb.framebuffer = -1;
 938                 event.info = info;
 939                 event.data = &con2fb;
 940                 blocking_notifier_call_chain(&fb_notifier_list,
 941                                     FB_EVENT_GET_CONSOLE_MAP, &event);
 942                 return copy_to_user(argp, &con2fb,
 943                                     sizeof(con2fb)) ? -EFAULT : 0;
 944         case FBIOPUT_CON2FBMAP:
 945                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
 946                         return - EFAULT;
 947                 if (con2fb.console < 0 || con2fb.console > MAX_NR_CONSOLES)
 948                     return -EINVAL;
 949                 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
 950                     return -EINVAL;
 951 #ifdef CONFIG_KMOD
 952                 if (!registered_fb[con2fb.framebuffer])
 953                     try_to_load(con2fb.framebuffer);
 954 #endif /* CONFIG_KMOD */
 955                 if (!registered_fb[con2fb.framebuffer])
 956                     return -EINVAL;
 957                 event.info = info;
 958                 event.data = &con2fb;
 959                 return blocking_notifier_call_chain(&fb_notifier_list,
 960                                            FB_EVENT_SET_CONSOLE_MAP,
 961                                            &event);
 962         case FBIOBLANK:
 963                 acquire_console_sem();
 964                 info->flags |= FBINFO_MISC_USEREVENT;
 965                 i = fb_blank(info, arg);
 966                 info->flags &= ~FBINFO_MISC_USEREVENT;
 967                 release_console_sem();
 968                 return i;
 969         default:
 970                 if (fb->fb_ioctl == NULL)
 971                         return -EINVAL;
 972                 return fb->fb_ioctl(info, cmd, arg);
 973         }
 974 }
 975
 976 #ifdef CONFIG_COMPAT
 977 struct fb_fix_screeninfo32 {
 978         char                    id[16];
 979         compat_caddr_t          smem_start;
 980         u32                     smem_len;
 981         u32                     type;
 982         u32                     type_aux;
 983         u32                     visual;
 984         u16                     xpanstep;
 985         u16                     ypanstep;
 986         u16                     ywrapstep;
 987         u32                     line_length;
 988         compat_caddr_t          mmio_start;
 989         u32                     mmio_len;
 990         u32                     accel;
 991         u16                     reserved[3];
 992 };
 993
 994 struct fb_cmap32 {
 995         u32                     start;
 996         u32                     len;
 997         compat_caddr_t  red;
 998         compat_caddr_t  green;
 999         compat_caddr_t  blue;
1000         compat_caddr_t  transp;
1001 };
1002
1003 static int fb_getput_cmap(struct inode *inode, struct file *file,
1004                         unsigned int cmd, unsigned long arg)
1005 {
1006         struct fb_cmap_user __user *cmap;
1007         struct fb_cmap32 __user *cmap32;
1008         __u32 data;
1009         int err;
1010
1011         cmap = compat_alloc_user_space(sizeof(*cmap));
1012         cmap32 = compat_ptr(arg);
1013
1014         if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1015                 return -EFAULT;
1016
1017         if (get_user(data, &cmap32->red) ||
1018             put_user(compat_ptr(data), &cmap->red) ||
1019             get_user(data, &cmap32->green) ||
1020             put_user(compat_ptr(data), &cmap->green) ||
1021             get_user(data, &cmap32->blue) ||
1022             put_user(compat_ptr(data), &cmap->blue) ||
1023             get_user(data, &cmap32->transp) ||
1024             put_user(compat_ptr(data), &cmap->transp))
1025                 return -EFAULT;
1026
1027         err = fb_ioctl(inode, file, cmd, (unsigned long) cmap);
1028
1029         if (!err) {
1030                 if (copy_in_user(&cmap32->start,
1031                                  &cmap->start,
1032                                  2 * sizeof(__u32)))
1033                         err = -EFAULT;
1034         }
1035         return err;
1036 }
1037
1038 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1039                                   struct fb_fix_screeninfo32 __user *fix32)
1040 {
1041         __u32 data;
1042         int err;
1043
1044         err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1045
1046         data = (__u32) (unsigned long) fix->smem_start;
1047         err |= put_user(data, &fix32->smem_start);
1048
1049         err |= put_user(fix->smem_len, &fix32->smem_len);
1050         err |= put_user(fix->type, &fix32->type);
1051         err |= put_user(fix->type_aux, &fix32->type_aux);
1052         err |= put_user(fix->visual, &fix32->visual);
1053         err |= put_user(fix->xpanstep, &fix32->xpanstep);
1054         err |= put_user(fix->ypanstep, &fix32->ypanstep);
1055         err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1056         err |= put_user(fix->line_length, &fix32->line_length);
1057
1058         data = (__u32) (unsigned long) fix->mmio_start;
1059         err |= put_user(data, &fix32->mmio_start);
1060
1061         err |= put_user(fix->mmio_len, &fix32->mmio_len);
1062         err |= put_user(fix->accel, &fix32->accel);
1063         err |= copy_to_user(fix32->reserved, fix->reserved,
1064                             sizeof(fix->reserved));
1065
1066         return err;
1067 }
1068
1069 static int fb_get_fscreeninfo(struct inode *inode, struct file *file,
1070                                 unsigned int cmd, unsigned long arg)
1071 {
1072         mm_segment_t old_fs;
1073         struct fb_fix_screeninfo fix;
1074         struct fb_fix_screeninfo32 __user *fix32;
1075         int err;
1076
1077         fix32 = compat_ptr(arg);
1078
1079         old_fs = get_fs();
1080         set_fs(KERNEL_DS);
1081         err = fb_ioctl(inode, file, cmd, (unsigned long) &fix);
1082         set_fs(old_fs);
1083
1084         if (!err)
1085                 err = do_fscreeninfo_to_user(&fix, fix32);
1086
1087         return err;
1088 }
1089
1090 static long
1091 fb_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1092 {
1093         struct inode *inode = file->f_dentry->d_inode;
1094         int fbidx = iminor(inode);
1095         struct fb_info *info = registered_fb[fbidx];
1096         struct fb_ops *fb = info->fbops;
1097         long ret = -ENOIOCTLCMD;
1098
1099         lock_kernel();
1100         switch(cmd) {
1101         case FBIOGET_VSCREENINFO:
1102         case FBIOPUT_VSCREENINFO:
1103         case FBIOPAN_DISPLAY:
1104         case FBIOGET_CON2FBMAP:
1105         case FBIOPUT_CON2FBMAP:
1106                 arg = (unsigned long) compat_ptr(arg);
1107         case FBIOBLANK:
1108                 ret = fb_ioctl(inode, file, cmd, arg);
1109                 break;
1110
1111         case FBIOGET_FSCREENINFO:
1112                 ret = fb_get_fscreeninfo(inode, file, cmd, arg);
1113                 break;
1114
1115         case FBIOGETCMAP:
1116         case FBIOPUTCMAP:
1117                 ret = fb_getput_cmap(inode, file, cmd, arg);
1118                 break;
1119
1120         default:
1121                 if (fb->fb_compat_ioctl)
1122                         ret = fb->fb_compat_ioctl(info, cmd, arg);
1123                 break;
1124         }
1125         unlock_kernel();
1126         return ret;
1127 }
1128 #endif
1129
1130 static int
1131 fb_mmap(struct file *file, struct vm_area_struct * vma)
1132 {
1133         int fbidx = iminor(file->f_dentry->d_inode);
1134         struct fb_info *info = registered_fb[fbidx];
1135         struct fb_ops *fb = info->fbops;
1136         unsigned long off;
1137 #if !defined(__sparc__) || defined(__sparc_v9__)
1138         unsigned long start;
1139         u32 len;
1140 #endif
1141
1142         if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
1143                 return -EINVAL;
1144         off = vma->vm_pgoff << PAGE_SHIFT;
1145         if (!fb)
1146                 return -ENODEV;
1147         if (fb->fb_mmap) {
1148                 int res;
1149                 lock_kernel();
1150                 res = fb->fb_mmap(info, vma);
1151                 unlock_kernel();
1152                 return res;
1153         }
1154
1155 #if defined(__sparc__) && !defined(__sparc_v9__)
1156         /* Should never get here, all fb drivers should have their own
1157            mmap routines */
1158         return -EINVAL;
1159 #else
1160         /* !sparc32... */
1161         lock_kernel();
1162
1163         /* frame buffer memory */
1164         start = info->fix.smem_start;
1165         len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
1166         if (off >= len) {
1167                 /* memory mapped io */
1168                 off -= len;
1169                 if (info->var.accel_flags) {
1170                         unlock_kernel();
1171                         return -EINVAL;
1172                 }
1173                 start = info->fix.mmio_start;
1174                 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
1175         }
1176         unlock_kernel();
1177         start &= PAGE_MASK;
1178         if ((vma->vm_end - vma->vm_start + off) > len)
1179                 return -EINVAL;
1180         off += start;
1181         vma->vm_pgoff = off >> PAGE_SHIFT;
1182         /* This is an IO map - tell maydump to skip this VMA */
1183         vma->vm_flags |= VM_IO | VM_RESERVED;
1184 #if defined(__mc68000__)
1185 #if defined(CONFIG_SUN3)
1186         pgprot_val(vma->vm_page_prot) |= SUN3_PAGE_NOCACHE;
1187 #elif defined(CONFIG_MMU)
1188         if (CPU_IS_020_OR_030)
1189                 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE030;
1190         if (CPU_IS_040_OR_060) {
1191                 pgprot_val(vma->vm_page_prot) &= _CACHEMASK040;
1192                 /* Use no-cache mode, serialized */
1193                 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE_S;
1194         }
1195 #endif
1196 #elif defined(__powerpc__)
1197         vma->vm_page_prot = phys_mem_access_prot(file, off >> PAGE_SHIFT,
1198                                                  vma->vm_end - vma->vm_start,
1199                                                  vma->vm_page_prot);
1200 #elif defined(__alpha__)
1201         /* Caching is off in the I/O space quadrant by design.  */
1202 #elif defined(__i386__) || defined(__x86_64__)
1203         if (boot_cpu_data.x86 > 3)
1204                 pgprot_val(vma->vm_page_prot) |= _PAGE_PCD;
1205 #elif defined(__mips__) || defined(__sparc_v9__)
1206         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1207 #elif defined(__hppa__)
1208         pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
1209 #elif defined(__arm__) || defined(__sh__) || defined(__m32r__)
1210         vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
1211 #elif defined(__ia64__)
1212         if (efi_range_is_wc(vma->vm_start, vma->vm_end - vma->vm_start))
1213                 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
1214         else
1215                 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1216 #else
1217 #warning What do we have to do here??
1218 #endif
1219         if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1220                              vma->vm_end - vma->vm_start, vma->vm_page_prot))
1221                 return -EAGAIN;
1222         return 0;
1223 #endif /* !sparc32 */
1224 }
1225
1226 static int
1227 fb_open(struct inode *inode, struct file *file)
1228 {
1229         int fbidx = iminor(inode);
1230         struct fb_info *info;
1231         int res = 0;
1232
1233         if (fbidx >= FB_MAX)
1234                 return -ENODEV;
1235 #ifdef CONFIG_KMOD
1236         if (!(info = registered_fb[fbidx]))
1237                 try_to_load(fbidx);
1238 #endif /* CONFIG_KMOD */
1239         if (!(info = registered_fb[fbidx]))
1240                 return -ENODEV;
1241         if (!try_module_get(info->fbops->owner))
1242                 return -ENODEV;
1243         file->private_data = info;
1244         if (info->fbops->fb_open) {
1245                 res = info->fbops->fb_open(info,1);
1246                 if (res)
1247                         module_put(info->fbops->owner);
1248         }
1249         return res;
1250 }
1251
1252 static int
1253 fb_release(struct inode *inode, struct file *file)
1254 {
1255         struct fb_info * const info = file->private_data;
1256
1257         lock_kernel();
1258         if (info->fbops->fb_release)
1259                 info->fbops->fb_release(info,1);
1260         module_put(info->fbops->owner);
1261         unlock_kernel();
1262         return 0;
1263 }
1264
1265 static struct file_operations fb_fops = {
1266         .owner =        THIS_MODULE,
1267         .read =         fb_read,
1268         .write =        fb_write,
1269         .ioctl =        fb_ioctl,
1270 #ifdef CONFIG_COMPAT
1271         .compat_ioctl = fb_compat_ioctl,
1272 #endif
1273         .mmap =         fb_mmap,
1274         .open =         fb_open,
1275         .release =      fb_release,
1276 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1277         .get_unmapped_area = get_fb_unmapped_area,
1278 #endif
1279 };
1280
1281 static struct class *fb_class;
1282
1283 /**
1284  *      register_framebuffer - registers a frame buffer device
1285  *      @fb_info: frame buffer info structure
1286  *
1287  *      Registers a frame buffer device @fb_info.
1288  *
1289  *      Returns negative errno on error, or zero for success.
1290  *
1291  */
1292
1293 int
1294 register_framebuffer(struct fb_info *fb_info)
1295 {
1296         int i;
1297         struct fb_event event;
1298         struct fb_videomode mode;
1299
1300         if (num_registered_fb == FB_MAX)
1301                 return -ENXIO;
1302         num_registered_fb++;
1303         for (i = 0 ; i < FB_MAX; i++)
1304                 if (!registered_fb[i])
1305                         break;
1306         fb_info->node = i;
1307
1308         fb_info->class_device = class_device_create(fb_class, NULL, MKDEV(FB_MAJOR, i),
1309                                     fb_info->device, "fb%d", i);
1310         if (IS_ERR(fb_info->class_device)) {
1311                 /* Not fatal */
1312                 printk(KERN_WARNING "Unable to create class_device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->class_device));
1313                 fb_info->class_device = NULL;
1314         } else
1315                 fb_init_class_device(fb_info);
1316
1317         if (fb_info->pixmap.addr == NULL) {
1318                 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1319                 if (fb_info->pixmap.addr) {
1320                         fb_info->pixmap.size = FBPIXMAPSIZE;
1321                         fb_info->pixmap.buf_align = 1;
1322                         fb_info->pixmap.scan_align = 1;
1323                         fb_info->pixmap.access_align = 32;
1324                         fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1325                 }
1326         }
1327         fb_info->pixmap.offset = 0;
1328
1329         if (!fb_info->modelist.prev || !fb_info->modelist.next)
1330                 INIT_LIST_HEAD(&fb_info->modelist);
1331
1332         fb_var_to_videomode(&mode, &fb_info->var);
1333         fb_add_videomode(&mode, &fb_info->modelist);
1334         registered_fb[i] = fb_info;
1335
1336         devfs_mk_cdev(MKDEV(FB_MAJOR, i),
1337                         S_IFCHR | S_IRUGO | S_IWUGO, "fb/%d", i);
1338         event.info = fb_info;
1339         blocking_notifier_call_chain(&fb_notifier_list,
1340                             FB_EVENT_FB_REGISTERED, &event);
1341         return 0;
1342 }
1343
1344
1345 /**
1346  *      unregister_framebuffer - releases a frame buffer device
1347  *      @fb_info: frame buffer info structure
1348  *
1349  *      Unregisters a frame buffer device @fb_info.
1350  *
1351  *      Returns negative errno on error, or zero for success.
1352  *
1353  */
1354
1355 int
1356 unregister_framebuffer(struct fb_info *fb_info)
1357 {
1358         int i;
1359
1360         i = fb_info->node;
1361         if (!registered_fb[i])
1362                 return -EINVAL;
1363         devfs_remove("fb/%d", i);
1364
1365         if (fb_info->pixmap.addr && (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1366                 kfree(fb_info->pixmap.addr);
1367         fb_destroy_modelist(&fb_info->modelist);
1368         registered_fb[i]=NULL;
1369         num_registered_fb--;
1370         fb_cleanup_class_device(fb_info);
1371         class_device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1372         return 0;
1373 }
1374
1375 /**
1376  *      fb_register_client - register a client notifier
1377  *      @nb: notifier block to callback on events
1378  */
1379 int fb_register_client(struct notifier_block *nb)
1380 {
1381         return blocking_notifier_chain_register(&fb_notifier_list, nb);
1382 }
1383
1384 /**
1385  *      fb_unregister_client - unregister a client notifier
1386  *      @nb: notifier block to callback on events
1387  */
1388 int fb_unregister_client(struct notifier_block *nb)
1389 {
1390         return blocking_notifier_chain_unregister(&fb_notifier_list, nb);
1391 }
1392
1393 /**
1394  *      fb_set_suspend - low level driver signals suspend
1395  *      @info: framebuffer affected
1396  *      @state: 0 = resuming, !=0 = suspending
1397  *
1398  *      This is meant to be used by low level drivers to
1399  *      signal suspend/resume to the core & clients.
1400  *      It must be called with the console semaphore held
1401  */
1402 void fb_set_suspend(struct fb_info *info, int state)
1403 {
1404         struct fb_event event;
1405
1406         event.info = info;
1407         if (state) {
1408                 blocking_notifier_call_chain(&fb_notifier_list,
1409                                 FB_EVENT_SUSPEND, &event);
1410                 info->state = FBINFO_STATE_SUSPENDED;
1411         } else {
1412                 info->state = FBINFO_STATE_RUNNING;
1413                 blocking_notifier_call_chain(&fb_notifier_list,
1414                                 FB_EVENT_RESUME, &event);
1415         }
1416 }
1417
1418 /**
1419  *      fbmem_init - init frame buffer subsystem
1420  *
1421  *      Initialize the frame buffer subsystem.
1422  *
1423  *      NOTE: This function is _only_ to be called by drivers/char/mem.c.
1424  *
1425  */
1426
1427 static int __init
1428 fbmem_init(void)
1429 {
1430         create_proc_read_entry("fb", 0, NULL, fbmem_read_proc, NULL);
1431
1432         devfs_mk_dir("fb");
1433         if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1434                 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1435
1436         fb_class = class_create(THIS_MODULE, "graphics");
1437         if (IS_ERR(fb_class)) {
1438                 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1439                 fb_class = NULL;
1440         }
1441         return 0;
1442 }
1443
1444 #ifdef MODULE
1445 module_init(fbmem_init);
1446 static void __exit
1447 fbmem_exit(void)
1448 {
1449         class_destroy(fb_class);
1450         unregister_chrdev(FB_MAJOR, "fb");
1451 }
1452
1453 module_exit(fbmem_exit);
1454 MODULE_LICENSE("GPL");
1455 MODULE_DESCRIPTION("Framebuffer base");
1456 #else
1457 subsys_initcall(fbmem_init);
1458 #endif
1459
1460 int fb_new_modelist(struct fb_info *info)
1461 {
1462         struct fb_event event;
1463         struct fb_var_screeninfo var = info->var;
1464         struct list_head *pos, *n;
1465         struct fb_modelist *modelist;
1466         struct fb_videomode *m, mode;
1467         int err = 1;
1468
1469         list_for_each_safe(pos, n, &info->modelist) {
1470                 modelist = list_entry(pos, struct fb_modelist, list);
1471                 m = &modelist->mode;
1472                 fb_videomode_to_var(&var, m);
1473                 var.activate = FB_ACTIVATE_TEST;
1474                 err = fb_set_var(info, &var);
1475                 fb_var_to_videomode(&mode, &var);
1476                 if (err || !fb_mode_is_equal(m, &mode)) {
1477                         list_del(pos);
1478                         kfree(pos);
1479                 }
1480         }
1481
1482         err = 1;
1483
1484         if (!list_empty(&info->modelist)) {
1485                 event.info = info;
1486                 err = blocking_notifier_call_chain(&fb_notifier_list,
1487                                            FB_EVENT_NEW_MODELIST,
1488                                            &event);
1489         }
1490
1491         return err;
1492 }
1493
1494 /**
1495  * fb_con_duit - user<->fbcon passthrough
1496  * @info: struct fb_info
1497  * @event: notification event to be passed to fbcon
1498  * @data: private data
1499  *
1500  * DESCRIPTION
1501  * This function is an fbcon-user event passing channel
1502  * which bypasses fbdev.  This is hopefully temporary
1503  * until a user interface for fbcon is created
1504  */
1505 int fb_con_duit(struct fb_info *info, int event, void *data)
1506 {
1507         struct fb_event evnt;
1508
1509         evnt.info = info;
1510         evnt.data = data;
1511
1512         return blocking_notifier_call_chain(&fb_notifier_list, event, &evnt);
1513 }
1514 EXPORT_SYMBOL(fb_con_duit);
1515
1516 static char *video_options[FB_MAX];
1517 static int ofonly;
1518
1519 extern const char *global_mode_option;
1520
1521 /**
1522  * fb_get_options - get kernel boot parameters
1523  * @name:   framebuffer name as it would appear in
1524  *          the boot parameter line
1525  *          (video=<name>:<options>)
1526  * @option: the option will be stored here
1527  *
1528  * NOTE: Needed to maintain backwards compatibility
1529  */
1530 int fb_get_options(char *name, char **option)
1531 {
1532         char *opt, *options = NULL;
1533         int opt_len, retval = 0;
1534         int name_len = strlen(name), i;
1535
1536         if (name_len && ofonly && strncmp(name, "offb", 4))
1537                 retval = 1;
1538
1539         if (name_len && !retval) {
1540                 for (i = 0; i < FB_MAX; i++) {
1541                         if (video_options[i] == NULL)
1542                                 continue;
1543                         opt_len = strlen(video_options[i]);
1544                         if (!opt_len)
1545                                 continue;
1546                         opt = video_options[i];
1547                         if (!strncmp(name, opt, name_len) &&
1548                             opt[name_len] == ':')
1549                                 options = opt + name_len + 1;
1550                 }
1551         }
1552         if (options && !strncmp(options, "off", 3))
1553                 retval = 1;
1554
1555         if (option)
1556                 *option = options;
1557
1558         return retval;
1559 }
1560
1561 #ifndef MODULE
1562 /**
1563  *      video_setup - process command line options
1564  *      @options: string of options
1565  *
1566  *      Process command line options for frame buffer subsystem.
1567  *
1568  *      NOTE: This function is a __setup and __init function.
1569  *            It only stores the options.  Drivers have to call
1570  *            fb_get_options() as necessary.
1571  *
1572  *      Returns zero.
1573  *
1574  */
1575 static int __init video_setup(char *options)
1576 {
1577         int i, global = 0;
1578
1579         if (!options || !*options)
1580                 global = 1;
1581
1582         if (!global && !strncmp(options, "ofonly", 6)) {
1583                 ofonly = 1;
1584                 global = 1;
1585         }
1586
1587         if (!global && !strstr(options, "fb:")) {
1588                 global_mode_option = options;
1589                 global = 1;
1590         }
1591
1592         if (!global) {
1593                 for (i = 0; i < FB_MAX; i++) {
1594                         if (video_options[i] == NULL) {
1595                                 video_options[i] = options;
1596                                 break;
1597                         }
1598
1599                 }
1600         }
1601
1602         return 1;
1603 }
1604 __setup("video=", video_setup);
1605 #endif
1606
1607     /*
1608      *  Visible symbols for modules
1609      */
1610
1611 EXPORT_SYMBOL(register_framebuffer);
1612 EXPORT_SYMBOL(unregister_framebuffer);
1613 EXPORT_SYMBOL(num_registered_fb);
1614 EXPORT_SYMBOL(registered_fb);
1615 EXPORT_SYMBOL(fb_prepare_logo);
1616 EXPORT_SYMBOL(fb_show_logo);
1617 EXPORT_SYMBOL(fb_set_var);
1618 EXPORT_SYMBOL(fb_blank);
1619 EXPORT_SYMBOL(fb_pan_display);
1620 EXPORT_SYMBOL(fb_get_buffer_offset);
1621 EXPORT_SYMBOL(fb_set_suspend);
1622 EXPORT_SYMBOL(fb_register_client);
1623 EXPORT_SYMBOL(fb_unregister_client);
1624 EXPORT_SYMBOL(fb_get_options);
1625 EXPORT_SYMBOL(fb_new_modelist);
1626
1627 MODULE_LICENSE("GPL");