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