git.oblomov.eu Git - linux-2.6/blob - drivers/video/fbmem.c

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