drivers/video/fbmem.c

   1 /*
   2  *  linux/drivers/video/fbmem.c
   3  *
   4  *  Copyright (C) 1994 Martin Schaller
   5  *
   6  *      2001 - Documented with DocBook
   7  *      - Brad Douglas <brad@neruo.com>
   8  *
   9  * This file is subject to the terms and conditions of the GNU General Public
  10  * License.  See the file COPYING in the main directory of this archive
  11  * for more details.
  12  */
  13
  14 #include <linux/config.h>
  15 #include <linux/module.h>
  16
  17 #include <linux/compat.h>
  18 #include <linux/types.h>
  19 #include <linux/errno.h>
  20 #include <linux/sched.h>
  21 #include <linux/smp_lock.h>
  22 #include <linux/kernel.h>
  23 #include <linux/major.h>
  24 #include <linux/slab.h>
  25 #include <linux/mm.h>
  26 #include <linux/mman.h>
  27 #include <linux/tty.h>
  28 #include <linux/init.h>
  29 #include <linux/linux_logo.h>
  30 #include <linux/proc_fs.h>
  31 #include <linux/console.h>
  32 #ifdef CONFIG_KMOD
  33 #include <linux/kmod.h>
  34 #endif
  35 #include <linux/devfs_fs_kernel.h>
  36 #include <linux/err.h>
  37 #include <linux/kernel.h>
  38 #include <linux/device.h>
  39 #include <linux/efi.h>
  40
  41 #if defined(__mc68000__) || defined(CONFIG_APUS)
  42 #include <asm/setup.h>
  43 #endif
  44
  45 #include <asm/io.h>
  46 #include <asm/uaccess.h>
  47 #include <asm/page.h>
  48 #include <asm/pgtable.h>
  49
  50 #include <linux/fb.h>
  51
  52     /*
  53      *  Frame buffer device initialization and setup routines
  54      */
  55
  56 #define FBPIXMAPSIZE    (1024 * 8)
  57
  58 static BLOCKING_NOTIFIER_HEAD(fb_notifier_list);
  59 struct fb_info *registered_fb[FB_MAX];
  60 int num_registered_fb;
  61
  62 /*
  63  * Helpers
  64  */
  65
  66 int fb_get_color_depth(struct fb_var_screeninfo *var,
  67                        struct fb_fix_screeninfo *fix)
  68 {
  69         int depth = 0;
  70
  71         if (fix->visual == FB_VISUAL_MONO01 ||
  72             fix->visual == FB_VISUAL_MONO10)
  73                 depth = 1;
  74         else {
  75                 if (var->green.length == var->blue.length &&
  76                     var->green.length == var->red.length &&
  77                     var->green.offset == var->blue.offset &&
  78                     var->green.offset == var->red.offset)
  79                         depth = var->green.length;
  80                 else
  81                         depth = var->green.length + var->red.length +
  82                                 var->blue.length;
  83         }
  84
  85         return depth;
  86 }
  87 EXPORT_SYMBOL(fb_get_color_depth);
  88
  89 /*
  90  * Data padding functions.
  91  */
  92 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
  93 {
  94         __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
  95 }
  96 EXPORT_SYMBOL(fb_pad_aligned_buffer);
  97
  98 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
  99                                 u32 shift_high, u32 shift_low, u32 mod)
 100 {
 101         u8 mask = (u8) (0xfff << shift_high), tmp;
 102         int i, j;
 103
 104         for (i = height; i--; ) {
 105                 for (j = 0; j < idx; j++) {
 106                         tmp = dst[j];
 107                         tmp &= mask;
 108                         tmp |= *src >> shift_low;
 109                         dst[j] = tmp;
 110                         tmp = *src << shift_high;
 111                         dst[j+1] = tmp;
 112                         src++;
 113                 }
 114                 tmp = dst[idx];
 115                 tmp &= mask;
 116                 tmp |= *src >> shift_low;
 117                 dst[idx] = tmp;
 118                 if (shift_high < mod) {
 119                         tmp = *src << shift_high;
 120                         dst[idx+1] = tmp;
 121                 }
 122                 src++;
 123                 dst += d_pitch;
 124         }
 125 }
 126 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
 127
 128 /*
 129  * we need to lock this section since fb_cursor
 130  * may use fb_imageblit()
 131  */
 132 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
 133 {
 134         u32 align = buf->buf_align - 1, offset;
 135         char *addr = buf->addr;
 136
 137         /* If IO mapped, we need to sync before access, no sharing of
 138          * the pixmap is done
 139          */
 140         if (buf->flags & FB_PIXMAP_IO) {
 141                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 142                         info->fbops->fb_sync(info);
 143                 return addr;
 144         }
 145
 146         /* See if we fit in the remaining pixmap space */
 147         offset = buf->offset + align;
 148         offset &= ~align;
 149         if (offset + size > buf->size) {
 150                 /* We do not fit. In order to be able to re-use the buffer,
 151                  * we must ensure no asynchronous DMA'ing or whatever operation
 152                  * is in progress, we sync for that.
 153                  */
 154                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 155                         info->fbops->fb_sync(info);
 156                 offset = 0;
 157         }
 158         buf->offset = offset + size;
 159         addr += offset;
 160
 161         return addr;
 162 }
 163
 164 #ifdef CONFIG_LOGO
 165 #include <linux/linux_logo.h>
 166
 167 static inline unsigned safe_shift(unsigned d, int n)
 168 {
 169         return n < 0 ? d >> -n : d << n;
 170 }
 171
 172 static void fb_set_logocmap(struct fb_info *info,
 173                                    const struct linux_logo *logo)
 174 {
 175         struct fb_cmap palette_cmap;
 176         u16 palette_green[16];
 177         u16 palette_blue[16];
 178         u16 palette_red[16];
 179         int i, j, n;
 180         const unsigned char *clut = logo->clut;
 181
 182         palette_cmap.start = 0;
 183         palette_cmap.len = 16;
 184         palette_cmap.red = palette_red;
 185         palette_cmap.green = palette_green;
 186         palette_cmap.blue = palette_blue;
 187         palette_cmap.transp = NULL;
 188
 189         for (i = 0; i < logo->clutsize; i += n) {
 190                 n = logo->clutsize - i;
 191                 /* palette_cmap provides space for only 16 colors at once */
 192                 if (n > 16)
 193                         n = 16;
 194                 palette_cmap.start = 32 + i;
 195                 palette_cmap.len = n;
 196                 for (j = 0; j < n; ++j) {
 197                         palette_cmap.red[j] = clut[0] << 8 | clut[0];
 198                         palette_cmap.green[j] = clut[1] << 8 | clut[1];
 199                         palette_cmap.blue[j] = clut[2] << 8 | clut[2];
 200                         clut += 3;
 201                 }
 202                 fb_set_cmap(&palette_cmap, info);
 203         }
 204 }
 205
 206 static void  fb_set_logo_truepalette(struct fb_info *info,
 207                                             const struct linux_logo *logo,
 208                                             u32 *palette)
 209 {
 210         unsigned char mask[9] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
 211         unsigned char redmask, greenmask, bluemask;
 212         int redshift, greenshift, blueshift;
 213         int i;
 214         const unsigned char *clut = logo->clut;
 215
 216         /*
 217          * We have to create a temporary palette since console palette is only
 218          * 16 colors long.
 219          */
 220         /* Bug: Doesn't obey msb_right ... (who needs that?) */
 221         redmask   = mask[info->var.red.length   < 8 ? info->var.red.length   : 8];
 222         greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
 223         bluemask  = mask[info->var.blue.length  < 8 ? info->var.blue.length  : 8];
 224         redshift   = info->var.red.offset   - (8 - info->var.red.length);
 225         greenshift = info->var.green.offset - (8 - info->var.green.length);
 226         blueshift  = info->var.blue.offset  - (8 - info->var.blue.length);
 227
 228         for ( i = 0; i < logo->clutsize; i++) {
 229                 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
 230                                  safe_shift((clut[1] & greenmask), greenshift) |
 231                                  safe_shift((clut[2] & bluemask), blueshift));
 232                 clut += 3;
 233         }
 234 }
 235
 236 static void fb_set_logo_directpalette(struct fb_info *info,
 237                                              const struct linux_logo *logo,
 238                                              u32 *palette)
 239 {
 240         int redshift, greenshift, blueshift;
 241         int i;
 242
 243         redshift = info->var.red.offset;
 244         greenshift = info->var.green.offset;
 245         blueshift = info->var.blue.offset;
 246
 247         for (i = 32; i < logo->clutsize; i++)
 248                 palette[i] = i << redshift | i << greenshift | i << blueshift;
 249 }
 250
 251 static void fb_set_logo(struct fb_info *info,
 252                                const struct linux_logo *logo, u8 *dst,
 253                                int depth)
 254 {
 255         int i, j, k;
 256         const u8 *src = logo->data;
 257         u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
 258         u8 fg = 1, d;
 259
 260         if (fb_get_color_depth(&info->var, &info->fix) == 3)
 261                 fg = 7;
 262
 263         if (info->fix.visual == FB_VISUAL_MONO01 ||
 264             info->fix.visual == FB_VISUAL_MONO10)
 265                 fg = ~((u8) (0xfff << info->var.green.length));
 266
 267         switch (depth) {
 268         case 4:
 269                 for (i = 0; i < logo->height; i++)
 270                         for (j = 0; j < logo->width; src++) {
 271                                 *dst++ = *src >> 4;
 272                                 j++;
 273                                 if (j < logo->width) {
 274                                         *dst++ = *src & 0x0f;
 275                                         j++;
 276                                 }
 277                         }
 278                 break;
 279         case 1:
 280                 for (i = 0; i < logo->height; i++) {
 281                         for (j = 0; j < logo->width; src++) {
 282                                 d = *src ^ xor;
 283                                 for (k = 7; k >= 0; k--) {
 284                                         *dst++ = ((d >> k) & 1) ? fg : 0;
 285                                         j++;
 286                                 }
 287                         }
 288                 }
 289                 break;
 290         }
 291 }
 292
 293 /*
 294  * Three (3) kinds of logo maps exist.  linux_logo_clut224 (>16 colors),
 295  * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors).  Depending on
 296  * the visual format and color depth of the framebuffer, the DAC, the
 297  * pseudo_palette, and the logo data will be adjusted accordingly.
 298  *
 299  * Case 1 - linux_logo_clut224:
 300  * Color exceeds the number of console colors (16), thus we set the hardware DAC
 301  * using fb_set_cmap() appropriately.  The "needs_cmapreset"  flag will be set.
 302  *
 303  * For visuals that require color info from the pseudo_palette, we also construct
 304  * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
 305  * will be set.
 306  *
 307  * Case 2 - linux_logo_vga16:
 308  * The number of colors just matches the console colors, thus there is no need
 309  * to set the DAC or the pseudo_palette.  However, the bitmap is packed, ie,
 310  * each byte contains color information for two pixels (upper and lower nibble).
 311  * To be consistent with fb_imageblit() usage, we therefore separate the two
 312  * nibbles into separate bytes. The "depth" flag will be set to 4.
 313  *
 314  * Case 3 - linux_logo_mono:
 315  * This is similar with Case 2.  Each byte contains information for 8 pixels.
 316  * We isolate each bit and expand each into a byte. The "depth" flag will
 317  * be set to 1.
 318  */
 319 static struct logo_data {
 320         int depth;
 321         int needs_directpalette;
 322         int needs_truepalette;
 323         int needs_cmapreset;
 324         const struct linux_logo *logo;
 325 } fb_logo;
 326
 327 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
 328 {
 329         u32 size = width * height, i;
 330
 331         out += size - 1;
 332
 333         for (i = size; i--; )
 334                 *out-- = *in++;
 335 }
 336
 337 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
 338 {
 339         int i, j, w = width - 1;
 340
 341         for (i = 0; i < height; i++)
 342                 for (j = 0; j < width; j++)
 343                         out[height * j + w - i] = *in++;
 344 }
 345
 346 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
 347 {
 348         int i, j, w = width - 1;
 349
 350         for (i = 0; i < height; i++)
 351                 for (j = 0; j < width; j++)
 352                         out[height * (w - j) + i] = *in++;
 353 }
 354
 355 static void fb_rotate_logo(struct fb_info *info, u8 *dst,
 356                            struct fb_image *image, int rotate)
 357 {
 358         u32 tmp;
 359
 360         if (rotate == FB_ROTATE_UD) {
 361                 image->dx = info->var.xres - image->width;
 362                 image->dy = info->var.yres - image->height;
 363                 fb_rotate_logo_ud(image->data, dst, image->width,
 364                                   image->height);
 365         } else if (rotate == FB_ROTATE_CW) {
 366                 tmp = image->width;
 367                 image->width = image->height;
 368                 image->height = tmp;
 369                 image->dx = info->var.xres - image->height;
 370                 fb_rotate_logo_cw(image->data, dst, image->width,
 371                                   image->height);
 372         } else if (rotate == FB_ROTATE_CCW) {
 373                 tmp = image->width;
 374                 image->width = image->height;
 375                 image->height = tmp;
 376                 image->dy = info->var.yres - image->width;
 377                 fb_rotate_logo_ccw(image->data, dst, image->width,
 378                                    image->height);
 379         }
 380
 381         image->data = dst;
 382 }
 383
 384 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
 385                             int rotate)
 386 {
 387         int x;
 388
 389         if (rotate == FB_ROTATE_UR) {
 390                 for (x = 0; x < num_online_cpus() &&
 391                              x * (fb_logo.logo->width + 8) <=
 392                              info->var.xres - fb_logo.logo->width; x++) {
 393                         info->fbops->fb_imageblit(info, image);
 394                         image->dx += fb_logo.logo->width + 8;
 395                 }
 396         } else if (rotate == FB_ROTATE_UD) {
 397                 for (x = 0; x < num_online_cpus() &&
 398                              x * (fb_logo.logo->width + 8) <=
 399                              info->var.xres - fb_logo.logo->width; x++) {
 400                         info->fbops->fb_imageblit(info, image);
 401                         image->dx -= fb_logo.logo->width + 8;
 402                 }
 403         } else if (rotate == FB_ROTATE_CW) {
 404                 for (x = 0; x < num_online_cpus() &&
 405                              x * (fb_logo.logo->width + 8) <=
 406                              info->var.yres - fb_logo.logo->width; x++) {
 407                         info->fbops->fb_imageblit(info, image);
 408                         image->dy += fb_logo.logo->width + 8;
 409                 }
 410         } else if (rotate == FB_ROTATE_CCW) {
 411                 for (x = 0; x < num_online_cpus() &&
 412                              x * (fb_logo.logo->width + 8) <=
 413                              info->var.yres - fb_logo.logo->width; x++) {
 414                         info->fbops->fb_imageblit(info, image);
 415                         image->dy -= fb_logo.logo->width + 8;
 416                 }
 417         }
 418 }
 419
 420 int fb_prepare_logo(struct fb_info *info, int rotate)
 421 {
 422         int depth = fb_get_color_depth(&info->var, &info->fix);
 423         int yres;
 424
 425         memset(&fb_logo, 0, sizeof(struct logo_data));
 426
 427         if (info->flags & FBINFO_MISC_TILEBLITTING)
 428                 return 0;
 429
 430         if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
 431                 depth = info->var.blue.length;
 432                 if (info->var.red.length < depth)
 433                         depth = info->var.red.length;
 434                 if (info->var.green.length < depth)
 435                         depth = info->var.green.length;
 436         }
 437
 438         if (depth >= 8) {
 439                 switch (info->fix.visual) {
 440                 case FB_VISUAL_TRUECOLOR:
 441                         fb_logo.needs_truepalette = 1;
 442                         break;
 443                 case FB_VISUAL_DIRECTCOLOR:
 444                         fb_logo.needs_directpalette = 1;
 445                         fb_logo.needs_cmapreset = 1;
 446                         break;
 447                 case FB_VISUAL_PSEUDOCOLOR:
 448                         fb_logo.needs_cmapreset = 1;
 449                         break;
 450                 }
 451         }
 452
 453         /* Return if no suitable logo was found */
 454         fb_logo.logo = fb_find_logo(depth);
 455
 456         if (!fb_logo.logo) {
 457                 return 0;
 458         }
 459
 460         if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
 461                 yres = info->var.yres;
 462         else
 463                 yres = info->var.xres;
 464
 465         if (fb_logo.logo->height > yres) {
 466                 fb_logo.logo = NULL;
 467                 return 0;
 468         }
 469
 470         /* What depth we asked for might be different from what we get */
 471         if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
 472                 fb_logo.depth = 8;
 473         else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
 474                 fb_logo.depth = 4;
 475         else
 476                 fb_logo.depth = 1;
 477         return fb_logo.logo->height;
 478 }
 479
 480 int fb_show_logo(struct fb_info *info, int rotate)
 481 {
 482         u32 *palette = NULL, *saved_pseudo_palette = NULL;
 483         unsigned char *logo_new = NULL, *logo_rotate = NULL;
 484         struct fb_image image;
 485
 486         /* Return if the frame buffer is not mapped or suspended */
 487         if (fb_logo.logo == NULL || info->state != FBINFO_STATE_RUNNING)
 488                 return 0;
 489
 490         image.depth = 8;
 491         image.data = fb_logo.logo->data;
 492
 493         if (fb_logo.needs_cmapreset)
 494                 fb_set_logocmap(info, fb_logo.logo);
 495
 496         if (fb_logo.needs_truepalette ||
 497             fb_logo.needs_directpalette) {
 498                 palette = kmalloc(256 * 4, GFP_KERNEL);
 499                 if (palette == NULL)
 500                         return 0;
 501
 502                 if (fb_logo.needs_truepalette)
 503                         fb_set_logo_truepalette(info, fb_logo.logo, palette);
 504                 else
 505                         fb_set_logo_directpalette(info, fb_logo.logo, palette);
 506
 507                 saved_pseudo_palette = info->pseudo_palette;
 508                 info->pseudo_palette = palette;
 509         }
 510
 511         if (fb_logo.depth <= 4) {
 512                 logo_new = kmalloc(fb_logo.logo->width * fb_logo.logo->height,
 513                                    GFP_KERNEL);
 514                 if (logo_new == NULL) {
 515                         kfree(palette);
 516                         if (saved_pseudo_palette)
 517                                 info->pseudo_palette = saved_pseudo_palette;
 518                         return 0;
 519                 }
 520                 image.data = logo_new;
 521                 fb_set_logo(info, fb_logo.logo, logo_new, fb_logo.depth);
 522         }
 523
 524         image.dx = 0;
 525         image.dy = 0;
 526         image.width = fb_logo.logo->width;
 527         image.height = fb_logo.logo->height;
 528
 529         if (rotate) {
 530                 logo_rotate = kmalloc(fb_logo.logo->width *
 531                                       fb_logo.logo->height, GFP_KERNEL);
 532                 if (logo_rotate)
 533                         fb_rotate_logo(info, logo_rotate, &image, rotate);
 534         }
 535
 536         fb_do_show_logo(info, &image, rotate);
 537
 538         kfree(palette);
 539         if (saved_pseudo_palette != NULL)
 540                 info->pseudo_palette = saved_pseudo_palette;
 541         kfree(logo_new);
 542         kfree(logo_rotate);
 543         return fb_logo.logo->height;
 544 }
 545 #else
 546 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
 547 int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
 548 #endif /* CONFIG_LOGO */
 549
 550 static int fbmem_read_proc(char *buf, char **start, off_t offset,
 551                            int len, int *eof, void *private)
 552 {
 553         struct fb_info **fi;
 554         int clen;
 555
 556         clen = 0;
 557         for (fi = registered_fb; fi < &registered_fb[FB_MAX] && len < 4000; fi++)
 558                 if (*fi)
 559                         clen += sprintf(buf + clen, "%d %s\n",
 560                                         (*fi)->node,
 561                                         (*fi)->fix.id);
 562         *start = buf + offset;
 563         if (clen > offset)
 564                 clen -= offset;
 565         else
 566                 clen = 0;
 567         return clen < len ? clen : len;
 568 }
 569
 570 static ssize_t
 571 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 572 {
 573         unsigned long p = *ppos;
 574         struct inode *inode = file->f_dentry->d_inode;
 575         int fbidx = iminor(inode);
 576         struct fb_info *info = registered_fb[fbidx];
 577         u32 *buffer, *dst;
 578         u32 __iomem *src;
 579         int c, i, cnt = 0, err = 0;
 580         unsigned long total_size;
 581
 582         if (!info || ! info->screen_base)
 583                 return -ENODEV;
 584
 585         if (info->state != FBINFO_STATE_RUNNING)
 586                 return -EPERM;
 587
 588         if (info->fbops->fb_read)
 589                 return info->fbops->fb_read(file, buf, count, ppos);
 590
 591         total_size = info->screen_size;
 592
 593         if (total_size == 0)
 594                 total_size = info->fix.smem_len;
 595
 596         if (p >= total_size)
 597                 return 0;
 598
 599         if (count >= total_size)
 600                 count = total_size;
 601
 602         if (count + p > total_size)
 603                 count = total_size - p;
 604
 605         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 606                          GFP_KERNEL);
 607         if (!buffer)
 608                 return -ENOMEM;
 609
 610         src = (u32 __iomem *) (info->screen_base + p);
 611
 612         if (info->fbops->fb_sync)
 613                 info->fbops->fb_sync(info);
 614
 615         while (count) {
 616                 c  = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 617                 dst = buffer;
 618                 for (i = c >> 2; i--; )
 619                         *dst++ = fb_readl(src++);
 620                 if (c & 3) {
 621                         u8 *dst8 = (u8 *) dst;
 622                         u8 __iomem *src8 = (u8 __iomem *) src;
 623
 624                         for (i = c & 3; i--;)
 625                                 *dst8++ = fb_readb(src8++);
 626
 627                         src = (u32 __iomem *) src8;
 628                 }
 629
 630                 if (copy_to_user(buf, buffer, c)) {
 631                         err = -EFAULT;
 632                         break;
 633                 }
 634                 *ppos += c;
 635                 buf += c;
 636                 cnt += c;
 637                 count -= c;
 638         }
 639
 640         kfree(buffer);
 641
 642         return (err) ? err : cnt;
 643 }
 644
 645 static ssize_t
 646 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 647 {
 648         unsigned long p = *ppos;
 649         struct inode *inode = file->f_dentry->d_inode;
 650         int fbidx = iminor(inode);
 651         struct fb_info *info = registered_fb[fbidx];
 652         u32 *buffer, *src;
 653         u32 __iomem *dst;
 654         int c, i, cnt = 0, err = 0;
 655         unsigned long total_size;
 656
 657         if (!info || !info->screen_base)
 658                 return -ENODEV;
 659
 660         if (info->state != FBINFO_STATE_RUNNING)
 661                 return -EPERM;
 662
 663         if (info->fbops->fb_write)
 664                 return info->fbops->fb_write(file, buf, count, ppos);
 665
 666         total_size = info->screen_size;
 667
 668         if (total_size == 0)
 669                 total_size = info->fix.smem_len;
 670
 671         if (p > total_size)
 672                 return 0;
 673
 674         if (count >= total_size)
 675                 count = total_size;
 676
 677         if (count + p > total_size)
 678                 count = total_size - p;
 679
 680         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 681                          GFP_KERNEL);
 682         if (!buffer)
 683                 return -ENOMEM;
 684
 685         dst = (u32 __iomem *) (info->screen_base + p);
 686
 687         if (info->fbops->fb_sync)
 688                 info->fbops->fb_sync(info);
 689
 690         while (count) {
 691                 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 692                 src = buffer;
 693
 694                 if (copy_from_user(src, buf, c)) {
 695                         err = -EFAULT;
 696                         break;
 697                 }
 698
 699                 for (i = c >> 2; i--; )
 700                         fb_writel(*src++, dst++);
 701
 702                 if (c & 3) {
 703                         u8 *src8 = (u8 *) src;
 704                         u8 __iomem *dst8 = (u8 __iomem *) dst;
 705
 706                         for (i = c & 3; i--; )
 707                                 fb_writeb(*src8++, dst8++);
 708
 709                         dst = (u32 __iomem *) dst8;
 710                 }
 711
 712                 *ppos += c;
 713                 buf += c;
 714                 cnt += c;
 715                 count -= c;
 716         }
 717
 718         kfree(buffer);
 719
 720         return (err) ? err : cnt;
 721 }
 722
 723 #ifdef CONFIG_KMOD
 724 static void try_to_load(int fb)
 725 {
 726         request_module("fb%d", fb);
 727 }
 728 #endif /* CONFIG_KMOD */
 729
 730 int
 731 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
 732 {
 733         struct fb_fix_screeninfo *fix = &info->fix;
 734         int xoffset = var->xoffset;
 735         int yoffset = var->yoffset;
 736         int err = 0, yres = info->var.yres;
 737
 738         if (var->yoffset > 0) {
 739                 if (var->vmode & FB_VMODE_YWRAP) {
 740                         if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
 741                                 err = -EINVAL;
 742                         else
 743                                 yres = 0;
 744                 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
 745                         err = -EINVAL;
 746         }
 747
 748         if (var->xoffset > 0 && (!fix->xpanstep ||
 749                                  (var->xoffset % fix->xpanstep)))
 750                 err = -EINVAL;
 751
 752         if (err || !info->fbops->fb_pan_display || xoffset < 0 ||
 753             yoffset < 0 || var->yoffset + yres > info->var.yres_virtual ||
 754             var->xoffset + info->var.xres > info->var.xres_virtual)
 755                 return -EINVAL;
 756
 757         if ((err = info->fbops->fb_pan_display(var, info)))
 758                 return err;
 759         info->var.xoffset = var->xoffset;
 760         info->var.yoffset = var->yoffset;
 761         if (var->vmode & FB_VMODE_YWRAP)
 762                 info->var.vmode |= FB_VMODE_YWRAP;
 763         else
 764                 info->var.vmode &= ~FB_VMODE_YWRAP;
 765         return 0;
 766 }
 767
 768 int
 769 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
 770 {
 771         int err, flags = info->flags;
 772
 773         if (var->activate & FB_ACTIVATE_INV_MODE) {
 774                 struct fb_videomode mode1, mode2;
 775                 int ret = 0;
 776
 777                 fb_var_to_videomode(&mode1, var);
 778                 fb_var_to_videomode(&mode2, &info->var);
 779                 /* make sure we don't delete the videomode of current var */
 780                 ret = fb_mode_is_equal(&mode1, &mode2);
 781
 782                 if (!ret) {
 783                     struct fb_event event;
 784
 785                     event.info = info;
 786                     event.data = &mode1;
 787                     ret = blocking_notifier_call_chain(&fb_notifier_list,
 788                                               FB_EVENT_MODE_DELETE, &event);
 789                 }
 790
 791                 if (!ret)
 792                     fb_delete_videomode(&mode1, &info->modelist);
 793
 794                 return ret;
 795         }
 796
 797         if ((var->activate & FB_ACTIVATE_FORCE) ||
 798             memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
 799                 if (!info->fbops->fb_check_var) {
 800                         *var = info->var;
 801                         return 0;
 802                 }
 803
 804                 if ((err = info->fbops->fb_check_var(var, info)))
 805                         return err;
 806
 807                 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
 808                         struct fb_videomode mode;
 809                         int err = 0;
 810
 811                         info->var = *var;
 812                         if (info->fbops->fb_set_par)
 813                                 info->fbops->fb_set_par(info);
 814
 815                         fb_pan_display(info, &info->var);
 816
 817                         fb_set_cmap(&info->cmap, info);
 818
 819                         fb_var_to_videomode(&mode, &info->var);
 820
 821                         if (info->modelist.prev && info->modelist.next &&
 822                             !list_empty(&info->modelist))
 823                                 err = fb_add_videomode(&mode, &info->modelist);
 824
 825                         if (!err && (flags & FBINFO_MISC_USEREVENT)) {
 826                                 struct fb_event event;
 827                                 int evnt = (var->activate & FB_ACTIVATE_ALL) ?
 828                                         FB_EVENT_MODE_CHANGE_ALL :
 829                                         FB_EVENT_MODE_CHANGE;
 830
 831                                 info->flags &= ~FBINFO_MISC_USEREVENT;
 832                                 event.info = info;
 833                                 blocking_notifier_call_chain(&fb_notifier_list,
 834                                                 evnt, &event);
 835                         }
 836                 }
 837         }
 838         return 0;
 839 }
 840
 841 int
 842 fb_blank(struct fb_info *info, int blank)
 843 {
 844         int ret = -EINVAL;
 845
 846         if (blank > FB_BLANK_POWERDOWN)
 847                 blank = FB_BLANK_POWERDOWN;
 848
 849         if (info->fbops->fb_blank)
 850                 ret = info->fbops->fb_blank(blank, info);
 851
 852         if (!ret) {
 853                 struct fb_event event;
 854
 855                 event.info = info;
 856                 event.data = &blank;
 857                 blocking_notifier_call_chain(&fb_notifier_list,
 858                                 FB_EVENT_BLANK, &event);
 859         }
 860
 861         return ret;
 862 }
 863
 864 static int
 865 fb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
 866          unsigned long arg)
 867 {
 868         int fbidx = iminor(inode);
 869         struct fb_info *info = registered_fb[fbidx];
 870         struct fb_ops *fb = info->fbops;
 871         struct fb_var_screeninfo var;
 872         struct fb_fix_screeninfo fix;
 873         struct fb_con2fbmap con2fb;
 874         struct fb_cmap_user cmap;
 875         struct fb_event event;
 876         void __user *argp = (void __user *)arg;
 877         int i;
 878
 879         if (!fb)
 880                 return -ENODEV;
 881         switch (cmd) {
 882         case FBIOGET_VSCREENINFO:
 883                 return copy_to_user(argp, &info->var,
 884                                     sizeof(var)) ? -EFAULT : 0;
 885         case FBIOPUT_VSCREENINFO:
 886                 if (copy_from_user(&var, argp, sizeof(var)))
 887                         return -EFAULT;
 888                 acquire_console_sem();
 889                 info->flags |= FBINFO_MISC_USEREVENT;
 890                 i = fb_set_var(info, &var);
 891                 info->flags &= ~FBINFO_MISC_USEREVENT;
 892                 release_console_sem();
 893                 if (i) return i;
 894                 if (copy_to_user(argp, &var, sizeof(var)))
 895                         return -EFAULT;
 896                 return 0;
 897         case FBIOGET_FSCREENINFO:
 898                 return copy_to_user(argp, &info->fix,
 899                                     sizeof(fix)) ? -EFAULT : 0;
 900         case FBIOPUTCMAP:
 901                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
 902                         return -EFAULT;
 903                 return (fb_set_user_cmap(&cmap, info));
 904         case FBIOGETCMAP:
 905                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
 906                         return -EFAULT;
 907                 return fb_cmap_to_user(&info->cmap, &cmap);
 908         case FBIOPAN_DISPLAY:
 909                 if (copy_from_user(&var, argp, sizeof(var)))
 910                         return -EFAULT;
 911                 acquire_console_sem();
 912                 i = fb_pan_display(info, &var);
 913                 release_console_sem();
 914                 if (i)
 915                         return i;
 916                 if (copy_to_user(argp, &var, sizeof(var)))
 917                         return -EFAULT;
 918                 return 0;
 919         case FBIO_CURSOR:
 920                 return -EINVAL;
 921         case FBIOGET_CON2FBMAP:
 922                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
 923                         return -EFAULT;
 924                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
 925                     return -EINVAL;
 926                 con2fb.framebuffer = -1;
 927                 event.info = info;
 928                 event.data = &con2fb;
 929                 blocking_notifier_call_chain(&fb_notifier_list,
 930                                     FB_EVENT_GET_CONSOLE_MAP, &event);
 931                 return copy_to_user(argp, &con2fb,
 932                                     sizeof(con2fb)) ? -EFAULT : 0;
 933         case FBIOPUT_CON2FBMAP:
 934                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
 935                         return - EFAULT;
 936                 if (con2fb.console < 0 || con2fb.console > MAX_NR_CONSOLES)
 937                     return -EINVAL;
 938                 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
 939                     return -EINVAL;
 940 #ifdef CONFIG_KMOD
 941                 if (!registered_fb[con2fb.framebuffer])
 942                     try_to_load(con2fb.framebuffer);
 943 #endif /* CONFIG_KMOD */
 944                 if (!registered_fb[con2fb.framebuffer])
 945                     return -EINVAL;
 946                 event.info = info;
 947                 event.data = &con2fb;
 948                 return blocking_notifier_call_chain(&fb_notifier_list,
 949                                            FB_EVENT_SET_CONSOLE_MAP,
 950                                            &event);
 951         case FBIOBLANK:
 952                 acquire_console_sem();
 953                 info->flags |= FBINFO_MISC_USEREVENT;
 954                 i = fb_blank(info, arg);
 955                 info->flags &= ~FBINFO_MISC_USEREVENT;
 956                 release_console_sem();
 957                 return i;
 958         default:
 959                 if (fb->fb_ioctl == NULL)
 960                         return -EINVAL;
 961                 return fb->fb_ioctl(info, cmd, arg);
 962         }
 963 }
 964
 965 #ifdef CONFIG_COMPAT
 966 struct fb_fix_screeninfo32 {
 967         char                    id[16];
 968         compat_caddr_t          smem_start;
 969         u32                     smem_len;
 970         u32                     type;
 971         u32                     type_aux;
 972         u32                     visual;
 973         u16                     xpanstep;
 974         u16                     ypanstep;
 975         u16                     ywrapstep;
 976         u32                     line_length;
 977         compat_caddr_t          mmio_start;
 978         u32                     mmio_len;
 979         u32                     accel;
 980         u16                     reserved[3];
 981 };
 982
 983 struct fb_cmap32 {
 984         u32                     start;
 985         u32                     len;
 986         compat_caddr_t  red;
 987         compat_caddr_t  green;
 988         compat_caddr_t  blue;
 989         compat_caddr_t  transp;
 990 };
 991
 992 static int fb_getput_cmap(struct inode *inode, struct file *file,
 993                         unsigned int cmd, unsigned long arg)
 994 {
 995         struct fb_cmap_user __user *cmap;
 996         struct fb_cmap32 __user *cmap32;
 997         __u32 data;
 998         int err;
 999
1000         cmap = compat_alloc_user_space(sizeof(*cmap));
1001         cmap32 = compat_ptr(arg);
1002
1003         if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1004                 return -EFAULT;
1005
1006         if (get_user(data, &cmap32->red) ||
1007             put_user(compat_ptr(data), &cmap->red) ||
1008             get_user(data, &cmap32->green) ||
1009             put_user(compat_ptr(data), &cmap->green) ||
1010             get_user(data, &cmap32->blue) ||
1011             put_user(compat_ptr(data), &cmap->blue) ||
1012             get_user(data, &cmap32->transp) ||
1013             put_user(compat_ptr(data), &cmap->transp))
1014                 return -EFAULT;
1015
1016         err = fb_ioctl(inode, file, cmd, (unsigned long) cmap);
1017
1018         if (!err) {
1019                 if (copy_in_user(&cmap32->start,
1020                                  &cmap->start,
1021                                  2 * sizeof(__u32)))
1022                         err = -EFAULT;
1023         }
1024         return err;
1025 }
1026
1027 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1028                                   struct fb_fix_screeninfo32 __user *fix32)
1029 {
1030         __u32 data;
1031         int err;
1032
1033         err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1034
1035         data = (__u32) (unsigned long) fix->smem_start;
1036         err |= put_user(data, &fix32->smem_start);
1037
1038         err |= put_user(fix->smem_len, &fix32->smem_len);
1039         err |= put_user(fix->type, &fix32->type);
1040         err |= put_user(fix->type_aux, &fix32->type_aux);
1041         err |= put_user(fix->visual, &fix32->visual);
1042         err |= put_user(fix->xpanstep, &fix32->xpanstep);
1043         err |= put_user(fix->ypanstep, &fix32->ypanstep);
1044         err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1045         err |= put_user(fix->line_length, &fix32->line_length);
1046
1047         data = (__u32) (unsigned long) fix->mmio_start;
1048         err |= put_user(data, &fix32->mmio_start);
1049
1050         err |= put_user(fix->mmio_len, &fix32->mmio_len);
1051         err |= put_user(fix->accel, &fix32->accel);
1052         err |= copy_to_user(fix32->reserved, fix->reserved,
1053                             sizeof(fix->reserved));
1054
1055         return err;
1056 }
1057
1058 static int fb_get_fscreeninfo(struct inode *inode, struct file *file,
1059                                 unsigned int cmd, unsigned long arg)
1060 {
1061         mm_segment_t old_fs;
1062         struct fb_fix_screeninfo fix;
1063         struct fb_fix_screeninfo32 __user *fix32;
1064         int err;
1065
1066         fix32 = compat_ptr(arg);
1067
1068         old_fs = get_fs();
1069         set_fs(KERNEL_DS);
1070         err = fb_ioctl(inode, file, cmd, (unsigned long) &fix);
1071         set_fs(old_fs);
1072
1073         if (!err)
1074                 err = do_fscreeninfo_to_user(&fix, fix32);
1075
1076         return err;
1077 }
1078
1079 static long
1080 fb_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1081 {
1082         struct inode *inode = file->f_dentry->d_inode;
1083         int fbidx = iminor(inode);
1084         struct fb_info *info = registered_fb[fbidx];
1085         struct fb_ops *fb = info->fbops;
1086         long ret = -ENOIOCTLCMD;
1087
1088         lock_kernel();
1089         switch(cmd) {
1090         case FBIOGET_VSCREENINFO:
1091         case FBIOPUT_VSCREENINFO:
1092         case FBIOPAN_DISPLAY:
1093         case FBIOGET_CON2FBMAP:
1094         case FBIOPUT_CON2FBMAP:
1095                 arg = (unsigned long) compat_ptr(arg);
1096         case FBIOBLANK:
1097                 ret = fb_ioctl(inode, file, cmd, arg);
1098                 break;
1099
1100         case FBIOGET_FSCREENINFO:
1101                 ret = fb_get_fscreeninfo(inode, file, cmd, arg);
1102                 break;
1103
1104         case FBIOGETCMAP:
1105         case FBIOPUTCMAP:
1106                 ret = fb_getput_cmap(inode, file, cmd, arg);
1107                 break;
1108
1109         default:
1110                 if (fb->fb_compat_ioctl)
1111                         ret = fb->fb_compat_ioctl(info, cmd, arg);
1112                 break;
1113         }
1114         unlock_kernel();
1115         return ret;
1116 }
1117 #endif
1118
1119 static int
1120 fb_mmap(struct file *file, struct vm_area_struct * vma)
1121 {
1122         int fbidx = iminor(file->f_dentry->d_inode);
1123         struct fb_info *info = registered_fb[fbidx];
1124         struct fb_ops *fb = info->fbops;
1125         unsigned long off;
1126 #if !defined(__sparc__) || defined(__sparc_v9__)
1127         unsigned long start;
1128         u32 len;
1129 #endif
1130
1131         if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
1132                 return -EINVAL;
1133         off = vma->vm_pgoff << PAGE_SHIFT;
1134         if (!fb)
1135                 return -ENODEV;
1136         if (fb->fb_mmap) {
1137                 int res;
1138                 lock_kernel();
1139                 res = fb->fb_mmap(info, vma);
1140                 unlock_kernel();
1141                 return res;
1142         }
1143
1144 #if defined(__sparc__) && !defined(__sparc_v9__)
1145         /* Should never get here, all fb drivers should have their own
1146            mmap routines */
1147         return -EINVAL;
1148 #else
1149         /* !sparc32... */
1150         lock_kernel();
1151
1152         /* frame buffer memory */
1153         start = info->fix.smem_start;
1154         len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
1155         if (off >= len) {
1156                 /* memory mapped io */
1157                 off -= len;
1158                 if (info->var.accel_flags) {
1159                         unlock_kernel();
1160                         return -EINVAL;
1161                 }
1162                 start = info->fix.mmio_start;
1163                 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
1164         }
1165         unlock_kernel();
1166         start &= PAGE_MASK;
1167         if ((vma->vm_end - vma->vm_start + off) > len)
1168                 return -EINVAL;
1169         off += start;
1170         vma->vm_pgoff = off >> PAGE_SHIFT;
1171         /* This is an IO map - tell maydump to skip this VMA */
1172         vma->vm_flags |= VM_IO | VM_RESERVED;
1173 #if defined(__mc68000__)
1174 #if defined(CONFIG_SUN3)
1175         pgprot_val(vma->vm_page_prot) |= SUN3_PAGE_NOCACHE;
1176 #elif defined(CONFIG_MMU)
1177         if (CPU_IS_020_OR_030)
1178                 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE030;
1179         if (CPU_IS_040_OR_060) {
1180                 pgprot_val(vma->vm_page_prot) &= _CACHEMASK040;
1181                 /* Use no-cache mode, serialized */
1182                 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE_S;
1183         }
1184 #endif
1185 #elif defined(__powerpc__)
1186         vma->vm_page_prot = phys_mem_access_prot(file, off >> PAGE_SHIFT,
1187                                                  vma->vm_end - vma->vm_start,
1188                                                  vma->vm_page_prot);
1189 #elif defined(__alpha__)
1190         /* Caching is off in the I/O space quadrant by design.  */
1191 #elif defined(__i386__) || defined(__x86_64__)
1192         if (boot_cpu_data.x86 > 3)
1193                 pgprot_val(vma->vm_page_prot) |= _PAGE_PCD;
1194 #elif defined(__mips__) || defined(__sparc_v9__)
1195         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1196 #elif defined(__hppa__)
1197         pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
1198 #elif defined(__arm__) || defined(__sh__) || defined(__m32r__)
1199         vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
1200 #elif defined(__ia64__)
1201         if (efi_range_is_wc(vma->vm_start, vma->vm_end - vma->vm_start))
1202                 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
1203         else
1204                 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1205 #else
1206 #warning What do we have to do here??
1207 #endif
1208         if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1209                              vma->vm_end - vma->vm_start, vma->vm_page_prot))
1210                 return -EAGAIN;
1211         return 0;
1212 #endif /* !sparc32 */
1213 }
1214
1215 static int
1216 fb_open(struct inode *inode, struct file *file)
1217 {
1218         int fbidx = iminor(inode);
1219         struct fb_info *info;
1220         int res = 0;
1221
1222         if (fbidx >= FB_MAX)
1223                 return -ENODEV;
1224 #ifdef CONFIG_KMOD
1225         if (!(info = registered_fb[fbidx]))
1226                 try_to_load(fbidx);
1227 #endif /* CONFIG_KMOD */
1228         if (!(info = registered_fb[fbidx]))
1229                 return -ENODEV;
1230         if (!try_module_get(info->fbops->owner))
1231                 return -ENODEV;
1232         file->private_data = info;
1233         if (info->fbops->fb_open) {
1234                 res = info->fbops->fb_open(info,1);
1235                 if (res)
1236                         module_put(info->fbops->owner);
1237         }
1238         return res;
1239 }
1240
1241 static int
1242 fb_release(struct inode *inode, struct file *file)
1243 {
1244         struct fb_info * const info = file->private_data;
1245
1246         lock_kernel();
1247         if (info->fbops->fb_release)
1248                 info->fbops->fb_release(info,1);
1249         module_put(info->fbops->owner);
1250         unlock_kernel();
1251         return 0;
1252 }
1253
1254 static struct file_operations fb_fops = {
1255         .owner =        THIS_MODULE,
1256         .read =         fb_read,
1257         .write =        fb_write,
1258         .ioctl =        fb_ioctl,
1259 #ifdef CONFIG_COMPAT
1260         .compat_ioctl = fb_compat_ioctl,
1261 #endif
1262         .mmap =         fb_mmap,
1263         .open =         fb_open,
1264         .release =      fb_release,
1265 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1266         .get_unmapped_area = get_fb_unmapped_area,
1267 #endif
1268 };
1269
1270 static struct class *fb_class;
1271
1272 /**
1273  *      register_framebuffer - registers a frame buffer device
1274  *      @fb_info: frame buffer info structure
1275  *
1276  *      Registers a frame buffer device @fb_info.
1277  *
1278  *      Returns negative errno on error, or zero for success.
1279  *
1280  */
1281
1282 int
1283 register_framebuffer(struct fb_info *fb_info)
1284 {
1285         int i;
1286         struct fb_event event;
1287         struct fb_videomode mode;
1288
1289         if (num_registered_fb == FB_MAX)
1290                 return -ENXIO;
1291         num_registered_fb++;
1292         for (i = 0 ; i < FB_MAX; i++)
1293                 if (!registered_fb[i])
1294                         break;
1295         fb_info->node = i;
1296
1297         fb_info->class_device = class_device_create(fb_class, NULL, MKDEV(FB_MAJOR, i),
1298                                     fb_info->device, "fb%d", i);
1299         if (IS_ERR(fb_info->class_device)) {
1300                 /* Not fatal */
1301                 printk(KERN_WARNING "Unable to create class_device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->class_device));
1302                 fb_info->class_device = NULL;
1303         } else
1304                 fb_init_class_device(fb_info);
1305
1306         if (fb_info->pixmap.addr == NULL) {
1307                 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1308                 if (fb_info->pixmap.addr) {
1309                         fb_info->pixmap.size = FBPIXMAPSIZE;
1310                         fb_info->pixmap.buf_align = 1;
1311                         fb_info->pixmap.scan_align = 1;
1312                         fb_info->pixmap.access_align = 32;
1313                         fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1314                 }
1315         }
1316         fb_info->pixmap.offset = 0;
1317
1318         if (!fb_info->modelist.prev || !fb_info->modelist.next)
1319                 INIT_LIST_HEAD(&fb_info->modelist);
1320
1321         fb_var_to_videomode(&mode, &fb_info->var);
1322         fb_add_videomode(&mode, &fb_info->modelist);
1323         registered_fb[i] = fb_info;
1324
1325         devfs_mk_cdev(MKDEV(FB_MAJOR, i),
1326                         S_IFCHR | S_IRUGO | S_IWUGO, "fb/%d", i);
1327         event.info = fb_info;
1328         blocking_notifier_call_chain(&fb_notifier_list,
1329                             FB_EVENT_FB_REGISTERED, &event);
1330         return 0;
1331 }
1332
1333
1334 /**
1335  *      unregister_framebuffer - releases a frame buffer device
1336  *      @fb_info: frame buffer info structure
1337  *
1338  *      Unregisters a frame buffer device @fb_info.
1339  *
1340  *      Returns negative errno on error, or zero for success.
1341  *
1342  */
1343
1344 int
1345 unregister_framebuffer(struct fb_info *fb_info)
1346 {
1347         int i;
1348
1349         i = fb_info->node;
1350         if (!registered_fb[i])
1351                 return -EINVAL;
1352         devfs_remove("fb/%d", i);
1353
1354         if (fb_info->pixmap.addr && (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1355                 kfree(fb_info->pixmap.addr);
1356         fb_destroy_modelist(&fb_info->modelist);
1357         registered_fb[i]=NULL;
1358         num_registered_fb--;
1359         fb_cleanup_class_device(fb_info);
1360         class_device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1361         return 0;
1362 }
1363
1364 /**
1365  *      fb_register_client - register a client notifier
1366  *      @nb: notifier block to callback on events
1367  */
1368 int fb_register_client(struct notifier_block *nb)
1369 {
1370         return blocking_notifier_chain_register(&fb_notifier_list, nb);
1371 }
1372
1373 /**
1374  *      fb_unregister_client - unregister a client notifier
1375  *      @nb: notifier block to callback on events
1376  */
1377 int fb_unregister_client(struct notifier_block *nb)
1378 {
1379         return blocking_notifier_chain_unregister(&fb_notifier_list, nb);
1380 }
1381
1382 /**
1383  *      fb_set_suspend - low level driver signals suspend
1384  *      @info: framebuffer affected
1385  *      @state: 0 = resuming, !=0 = suspending
1386  *
1387  *      This is meant to be used by low level drivers to
1388  *      signal suspend/resume to the core & clients.
1389  *      It must be called with the console semaphore held
1390  */
1391 void fb_set_suspend(struct fb_info *info, int state)
1392 {
1393         struct fb_event event;
1394
1395         event.info = info;
1396         if (state) {
1397                 blocking_notifier_call_chain(&fb_notifier_list,
1398                                 FB_EVENT_SUSPEND, &event);
1399                 info->state = FBINFO_STATE_SUSPENDED;
1400         } else {
1401                 info->state = FBINFO_STATE_RUNNING;
1402                 blocking_notifier_call_chain(&fb_notifier_list,
1403                                 FB_EVENT_RESUME, &event);
1404         }
1405 }
1406
1407 /**
1408  *      fbmem_init - init frame buffer subsystem
1409  *
1410  *      Initialize the frame buffer subsystem.
1411  *
1412  *      NOTE: This function is _only_ to be called by drivers/char/mem.c.
1413  *
1414  */
1415
1416 static int __init
1417 fbmem_init(void)
1418 {
1419         create_proc_read_entry("fb", 0, NULL, fbmem_read_proc, NULL);
1420
1421         devfs_mk_dir("fb");
1422         if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1423                 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1424
1425         fb_class = class_create(THIS_MODULE, "graphics");
1426         if (IS_ERR(fb_class)) {
1427                 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1428                 fb_class = NULL;
1429         }
1430         return 0;
1431 }
1432
1433 #ifdef MODULE
1434 module_init(fbmem_init);
1435 static void __exit
1436 fbmem_exit(void)
1437 {
1438         class_destroy(fb_class);
1439         unregister_chrdev(FB_MAJOR, "fb");
1440 }
1441
1442 module_exit(fbmem_exit);
1443 MODULE_LICENSE("GPL");
1444 MODULE_DESCRIPTION("Framebuffer base");
1445 #else
1446 subsys_initcall(fbmem_init);
1447 #endif
1448
1449 int fb_new_modelist(struct fb_info *info)
1450 {
1451         struct fb_event event;
1452         struct fb_var_screeninfo var = info->var;
1453         struct list_head *pos, *n;
1454         struct fb_modelist *modelist;
1455         struct fb_videomode *m, mode;
1456         int err = 1;
1457
1458         list_for_each_safe(pos, n, &info->modelist) {
1459                 modelist = list_entry(pos, struct fb_modelist, list);
1460                 m = &modelist->mode;
1461                 fb_videomode_to_var(&var, m);
1462                 var.activate = FB_ACTIVATE_TEST;
1463                 err = fb_set_var(info, &var);
1464                 fb_var_to_videomode(&mode, &var);
1465                 if (err || !fb_mode_is_equal(m, &mode)) {
1466                         list_del(pos);
1467                         kfree(pos);
1468                 }
1469         }
1470
1471         err = 1;
1472
1473         if (!list_empty(&info->modelist)) {
1474                 event.info = info;
1475                 err = blocking_notifier_call_chain(&fb_notifier_list,
1476                                            FB_EVENT_NEW_MODELIST,
1477                                            &event);
1478         }
1479
1480         return err;
1481 }
1482
1483 /**
1484  * fb_con_duit - user<->fbcon passthrough
1485  * @info: struct fb_info
1486  * @event: notification event to be passed to fbcon
1487  * @data: private data
1488  *
1489  * DESCRIPTION
1490  * This function is an fbcon-user event passing channel
1491  * which bypasses fbdev.  This is hopefully temporary
1492  * until a user interface for fbcon is created
1493  */
1494 int fb_con_duit(struct fb_info *info, int event, void *data)
1495 {
1496         struct fb_event evnt;
1497
1498         evnt.info = info;
1499         evnt.data = data;
1500
1501         return blocking_notifier_call_chain(&fb_notifier_list, event, &evnt);
1502 }
1503 EXPORT_SYMBOL(fb_con_duit);
1504
1505 static char *video_options[FB_MAX];
1506 static int ofonly;
1507
1508 extern const char *global_mode_option;
1509
1510 /**
1511  * fb_get_options - get kernel boot parameters
1512  * @name:   framebuffer name as it would appear in
1513  *          the boot parameter line
1514  *          (video=<name>:<options>)
1515  * @option: the option will be stored here
1516  *
1517  * NOTE: Needed to maintain backwards compatibility
1518  */
1519 int fb_get_options(char *name, char **option)
1520 {
1521         char *opt, *options = NULL;
1522         int opt_len, retval = 0;
1523         int name_len = strlen(name), i;
1524
1525         if (name_len && ofonly && strncmp(name, "offb", 4))
1526                 retval = 1;
1527
1528         if (name_len && !retval) {
1529                 for (i = 0; i < FB_MAX; i++) {
1530                         if (video_options[i] == NULL)
1531                                 continue;
1532                         opt_len = strlen(video_options[i]);
1533                         if (!opt_len)
1534                                 continue;
1535                         opt = video_options[i];
1536                         if (!strncmp(name, opt, name_len) &&
1537                             opt[name_len] == ':')
1538                                 options = opt + name_len + 1;
1539                 }
1540         }
1541         if (options && !strncmp(options, "off", 3))
1542                 retval = 1;
1543
1544         if (option)
1545                 *option = options;
1546
1547         return retval;
1548 }
1549
1550 #ifndef MODULE
1551 /**
1552  *      video_setup - process command line options
1553  *      @options: string of options
1554  *
1555  *      Process command line options for frame buffer subsystem.
1556  *
1557  *      NOTE: This function is a __setup and __init function.
1558  *            It only stores the options.  Drivers have to call
1559  *            fb_get_options() as necessary.
1560  *
1561  *      Returns zero.
1562  *
1563  */
1564 static int __init video_setup(char *options)
1565 {
1566         int i, global = 0;
1567
1568         if (!options || !*options)
1569                 global = 1;
1570
1571         if (!global && !strncmp(options, "ofonly", 6)) {
1572                 ofonly = 1;
1573                 global = 1;
1574         }
1575
1576         if (!global && !strstr(options, "fb:")) {
1577                 global_mode_option = options;
1578                 global = 1;
1579         }
1580
1581         if (!global) {
1582                 for (i = 0; i < FB_MAX; i++) {
1583                         if (video_options[i] == NULL) {
1584                                 video_options[i] = options;
1585                                 break;
1586                         }
1587
1588                 }
1589         }
1590
1591         return 1;
1592 }
1593 __setup("video=", video_setup);
1594 #endif
1595
1596     /*
1597      *  Visible symbols for modules
1598      */
1599
1600 EXPORT_SYMBOL(register_framebuffer);
1601 EXPORT_SYMBOL(unregister_framebuffer);
1602 EXPORT_SYMBOL(num_registered_fb);
1603 EXPORT_SYMBOL(registered_fb);
1604 EXPORT_SYMBOL(fb_prepare_logo);
1605 EXPORT_SYMBOL(fb_show_logo);
1606 EXPORT_SYMBOL(fb_set_var);
1607 EXPORT_SYMBOL(fb_blank);
1608 EXPORT_SYMBOL(fb_pan_display);
1609 EXPORT_SYMBOL(fb_get_buffer_offset);
1610 EXPORT_SYMBOL(fb_set_suspend);
1611 EXPORT_SYMBOL(fb_register_client);
1612 EXPORT_SYMBOL(fb_unregister_client);
1613 EXPORT_SYMBOL(fb_get_options);
1614 EXPORT_SYMBOL(fb_new_modelist);
1615
1616 MODULE_LICENSE("GPL");