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/types.h>
  18 #include <linux/errno.h>
  19 #include <linux/sched.h>
  20 #include <linux/smp_lock.h>
  21 #include <linux/kernel.h>
  22 #include <linux/major.h>
  23 #include <linux/slab.h>
  24 #include <linux/mm.h>
  25 #include <linux/mman.h>
  26 #include <linux/tty.h>
  27 #include <linux/init.h>
  28 #include <linux/linux_logo.h>
  29 #include <linux/proc_fs.h>
  30 #include <linux/console.h>
  31 #ifdef CONFIG_KMOD
  32 #include <linux/kmod.h>
  33 #endif
  34 #include <linux/devfs_fs_kernel.h>
  35 #include <linux/err.h>
  36 #include <linux/kernel.h>
  37 #include <linux/device.h>
  38
  39 #if defined(__mc68000__) || defined(CONFIG_APUS)
  40 #include <asm/setup.h>
  41 #endif
  42
  43 #include <asm/io.h>
  44 #include <asm/uaccess.h>
  45 #include <asm/page.h>
  46 #include <asm/pgtable.h>
  47
  48 #include <linux/fb.h>
  49
  50     /*
  51      *  Frame buffer device initialization and setup routines
  52      */
  53
  54 #define FBPIXMAPSIZE    16384
  55
  56 static struct notifier_block *fb_notifier_list;
  57 struct fb_info *registered_fb[FB_MAX];
  58 int num_registered_fb;
  59
  60 /*
  61  * Helpers
  62  */
  63
  64 int fb_get_color_depth(struct fb_info *info)
  65 {
  66         struct fb_var_screeninfo *var = &info->var;
  67
  68         if (var->green.length == var->blue.length &&
  69             var->green.length == var->red.length &&
  70             !var->green.offset && !var->blue.offset &&
  71             !var->red.offset)
  72                 return var->green.length;
  73         else
  74                 return (var->green.length + var->red.length +
  75                         var->blue.length);
  76 }
  77 EXPORT_SYMBOL(fb_get_color_depth);
  78
  79 /*
  80  * Drawing helpers.
  81  */
  82 void fb_iomove_buf_aligned(struct fb_info *info, struct fb_pixmap *buf,
  83                            u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch,
  84                            u32 height)
  85 {
  86         int i;
  87
  88         for (i = height; i--; ) {
  89                 buf->outbuf(info, dst, src, s_pitch);
  90                 src += s_pitch;
  91                 dst += d_pitch;
  92         }
  93 }
  94
  95 void fb_sysmove_buf_aligned(struct fb_info *info, struct fb_pixmap *buf,
  96                             u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch,
  97                             u32 height)
  98 {
  99         int i, j;
 100
 101         for (i = height; i--; ) {
 102                 for (j = 0; j < s_pitch; j++)
 103                         dst[j] = src[j];
 104                 src += s_pitch;
 105                 dst += d_pitch;
 106         }
 107 }
 108
 109 void fb_iomove_buf_unaligned(struct fb_info *info, struct fb_pixmap *buf,
 110                              u8 *dst, u32 d_pitch, u8 *src, u32 idx,
 111                              u32 height, u32 shift_high, u32 shift_low,
 112                              u32 mod)
 113 {
 114         u8 mask = (u8) (0xfff << shift_high), tmp;
 115         int i, j;
 116
 117         for (i = height; i--; ) {
 118                 for (j = 0; j < idx; j++) {
 119                         tmp = buf->inbuf(info, dst+j);
 120                         tmp &= mask;
 121                         tmp |= *src >> shift_low;
 122                         buf->outbuf(info, dst+j, &tmp, 1);
 123                         tmp = *src << shift_high;
 124                         buf->outbuf(info, dst+j+1, &tmp, 1);
 125                         src++;
 126                 }
 127                 tmp = buf->inbuf(info, dst+idx);
 128                 tmp &= mask;
 129                 tmp |= *src >> shift_low;
 130                 buf->outbuf(info, dst+idx, &tmp, 1);
 131                 if (shift_high < mod) {
 132                         tmp = *src << shift_high;
 133                         buf->outbuf(info, dst+idx+1, &tmp, 1);
 134                 }
 135                 src++;
 136                 dst += d_pitch;
 137         }
 138 }
 139
 140 void fb_sysmove_buf_unaligned(struct fb_info *info, struct fb_pixmap *buf,
 141                               u8 *dst, u32 d_pitch, u8 *src, u32 idx,
 142                               u32 height, u32 shift_high, u32 shift_low,
 143                               u32 mod)
 144 {
 145         u8 mask = (u8) (0xfff << shift_high), tmp;
 146         int i, j;
 147
 148         for (i = height; i--; ) {
 149                 for (j = 0; j < idx; j++) {
 150                         tmp = dst[j];
 151                         tmp &= mask;
 152                         tmp |= *src >> shift_low;
 153                         dst[j] = tmp;
 154                         tmp = *src << shift_high;
 155                         dst[j+1] = tmp;
 156                         src++;
 157                 }
 158                 tmp = dst[idx];
 159                 tmp &= mask;
 160                 tmp |= *src >> shift_low;
 161                 dst[idx] = tmp;
 162                 if (shift_high < mod) {
 163                         tmp = *src << shift_high;
 164                         dst[idx+1] = tmp;
 165                 }
 166                 src++;
 167                 dst += d_pitch;
 168         }
 169 }
 170
 171 /*
 172  * we need to lock this section since fb_cursor
 173  * may use fb_imageblit()
 174  */
 175 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
 176 {
 177         u32 align = buf->buf_align - 1, offset;
 178         char *addr = buf->addr;
 179
 180         /* If IO mapped, we need to sync before access, no sharing of
 181          * the pixmap is done
 182          */
 183         if (buf->flags & FB_PIXMAP_IO) {
 184                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 185                         info->fbops->fb_sync(info);
 186                 return addr;
 187         }
 188
 189         /* See if we fit in the remaining pixmap space */
 190         offset = buf->offset + align;
 191         offset &= ~align;
 192         if (offset + size > buf->size) {
 193                 /* We do not fit. In order to be able to re-use the buffer,
 194                  * we must ensure no asynchronous DMA'ing or whatever operation
 195                  * is in progress, we sync for that.
 196                  */
 197                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 198                         info->fbops->fb_sync(info);
 199                 offset = 0;
 200         }
 201         buf->offset = offset + size;
 202         addr += offset;
 203
 204         return addr;
 205 }
 206
 207 #ifdef CONFIG_LOGO
 208 #include <linux/linux_logo.h>
 209
 210 static inline unsigned safe_shift(unsigned d, int n)
 211 {
 212         return n < 0 ? d >> -n : d << n;
 213 }
 214
 215 static void fb_set_logocmap(struct fb_info *info,
 216                                    const struct linux_logo *logo)
 217 {
 218         struct fb_cmap palette_cmap;
 219         u16 palette_green[16];
 220         u16 palette_blue[16];
 221         u16 palette_red[16];
 222         int i, j, n;
 223         const unsigned char *clut = logo->clut;
 224
 225         palette_cmap.start = 0;
 226         palette_cmap.len = 16;
 227         palette_cmap.red = palette_red;
 228         palette_cmap.green = palette_green;
 229         palette_cmap.blue = palette_blue;
 230         palette_cmap.transp = NULL;
 231
 232         for (i = 0; i < logo->clutsize; i += n) {
 233                 n = logo->clutsize - i;
 234                 /* palette_cmap provides space for only 16 colors at once */
 235                 if (n > 16)
 236                         n = 16;
 237                 palette_cmap.start = 32 + i;
 238                 palette_cmap.len = n;
 239                 for (j = 0; j < n; ++j) {
 240                         palette_cmap.red[j] = clut[0] << 8 | clut[0];
 241                         palette_cmap.green[j] = clut[1] << 8 | clut[1];
 242                         palette_cmap.blue[j] = clut[2] << 8 | clut[2];
 243                         clut += 3;
 244                 }
 245                 fb_set_cmap(&palette_cmap, info);
 246         }
 247 }
 248
 249 static void  fb_set_logo_truepalette(struct fb_info *info,
 250                                             const struct linux_logo *logo,
 251                                             u32 *palette)
 252 {
 253         unsigned char mask[9] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
 254         unsigned char redmask, greenmask, bluemask;
 255         int redshift, greenshift, blueshift;
 256         int i;
 257         const unsigned char *clut = logo->clut;
 258
 259         /*
 260          * We have to create a temporary palette since console palette is only
 261          * 16 colors long.
 262          */
 263         /* Bug: Doesn't obey msb_right ... (who needs that?) */
 264         redmask   = mask[info->var.red.length   < 8 ? info->var.red.length   : 8];
 265         greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
 266         bluemask  = mask[info->var.blue.length  < 8 ? info->var.blue.length  : 8];
 267         redshift   = info->var.red.offset   - (8 - info->var.red.length);
 268         greenshift = info->var.green.offset - (8 - info->var.green.length);
 269         blueshift  = info->var.blue.offset  - (8 - info->var.blue.length);
 270
 271         for ( i = 0; i < logo->clutsize; i++) {
 272                 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
 273                                  safe_shift((clut[1] & greenmask), greenshift) |
 274                                  safe_shift((clut[2] & bluemask), blueshift));
 275                 clut += 3;
 276         }
 277 }
 278
 279 static void fb_set_logo_directpalette(struct fb_info *info,
 280                                              const struct linux_logo *logo,
 281                                              u32 *palette)
 282 {
 283         int redshift, greenshift, blueshift;
 284         int i;
 285
 286         redshift = info->var.red.offset;
 287         greenshift = info->var.green.offset;
 288         blueshift = info->var.blue.offset;
 289
 290         for (i = 32; i < logo->clutsize; i++)
 291                 palette[i] = i << redshift | i << greenshift | i << blueshift;
 292 }
 293
 294 static void fb_set_logo(struct fb_info *info,
 295                                const struct linux_logo *logo, u8 *dst,
 296                                int depth)
 297 {
 298         int i, j, k, fg = 1;
 299         const u8 *src = logo->data;
 300         u8 d, xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
 301
 302         if (fb_get_color_depth(info) == 3)
 303                 fg = 7;
 304
 305         switch (depth) {
 306         case 4:
 307                 for (i = 0; i < logo->height; i++)
 308                         for (j = 0; j < logo->width; src++) {
 309                                 *dst++ = *src >> 4;
 310                                 j++;
 311                                 if (j < logo->width) {
 312                                         *dst++ = *src & 0x0f;
 313                                         j++;
 314                                 }
 315                         }
 316                 break;
 317         case 1:
 318                 for (i = 0; i < logo->height; i++) {
 319                         for (j = 0; j < logo->width; src++) {
 320                                 d = *src ^ xor;
 321                                 for (k = 7; k >= 0; k--) {
 322                                         *dst++ = ((d >> k) & 1) ? fg : 0;
 323                                         j++;
 324                                 }
 325                         }
 326                 }
 327                 break;
 328         }
 329 }
 330
 331 /*
 332  * Three (3) kinds of logo maps exist.  linux_logo_clut224 (>16 colors),
 333  * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors).  Depending on
 334  * the visual format and color depth of the framebuffer, the DAC, the
 335  * pseudo_palette, and the logo data will be adjusted accordingly.
 336  *
 337  * Case 1 - linux_logo_clut224:
 338  * Color exceeds the number of console colors (16), thus we set the hardware DAC
 339  * using fb_set_cmap() appropriately.  The "needs_cmapreset"  flag will be set.
 340  *
 341  * For visuals that require color info from the pseudo_palette, we also construct
 342  * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
 343  * will be set.
 344  *
 345  * Case 2 - linux_logo_vga16:
 346  * The number of colors just matches the console colors, thus there is no need
 347  * to set the DAC or the pseudo_palette.  However, the bitmap is packed, ie,
 348  * each byte contains color information for two pixels (upper and lower nibble).
 349  * To be consistent with fb_imageblit() usage, we therefore separate the two
 350  * nibbles into separate bytes. The "depth" flag will be set to 4.
 351  *
 352  * Case 3 - linux_logo_mono:
 353  * This is similar with Case 2.  Each byte contains information for 8 pixels.
 354  * We isolate each bit and expand each into a byte. The "depth" flag will
 355  * be set to 1.
 356  */
 357 static struct logo_data {
 358         int depth;
 359         int needs_directpalette;
 360         int needs_truepalette;
 361         int needs_cmapreset;
 362         const struct linux_logo *logo;
 363 } fb_logo;
 364
 365 int fb_prepare_logo(struct fb_info *info)
 366 {
 367         int depth = fb_get_color_depth(info);
 368
 369         memset(&fb_logo, 0, sizeof(struct logo_data));
 370
 371         if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
 372                 depth = info->var.blue.length;
 373                 if (info->var.red.length < depth)
 374                         depth = info->var.red.length;
 375                 if (info->var.green.length < depth)
 376                         depth = info->var.green.length;
 377         }
 378
 379         if (depth >= 8) {
 380                 switch (info->fix.visual) {
 381                 case FB_VISUAL_TRUECOLOR:
 382                         fb_logo.needs_truepalette = 1;
 383                         break;
 384                 case FB_VISUAL_DIRECTCOLOR:
 385                         fb_logo.needs_directpalette = 1;
 386                         fb_logo.needs_cmapreset = 1;
 387                         break;
 388                 case FB_VISUAL_PSEUDOCOLOR:
 389                         fb_logo.needs_cmapreset = 1;
 390                         break;
 391                 }
 392         }
 393
 394         /* Return if no suitable logo was found */
 395         fb_logo.logo = fb_find_logo(depth);
 396
 397         if (!fb_logo.logo || fb_logo.logo->height > info->var.yres) {
 398                 fb_logo.logo = NULL;
 399                 return 0;
 400         }
 401         /* What depth we asked for might be different from what we get */
 402         if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
 403                 fb_logo.depth = 8;
 404         else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
 405                 fb_logo.depth = 4;
 406         else
 407                 fb_logo.depth = 1;
 408         return fb_logo.logo->height;
 409 }
 410
 411 int fb_show_logo(struct fb_info *info)
 412 {
 413         u32 *palette = NULL, *saved_pseudo_palette = NULL;
 414         unsigned char *logo_new = NULL;
 415         struct fb_image image;
 416         int x;
 417
 418         /* Return if the frame buffer is not mapped or suspended */
 419         if (fb_logo.logo == NULL || info->state != FBINFO_STATE_RUNNING)
 420                 return 0;
 421
 422         image.depth = 8;
 423         image.data = fb_logo.logo->data;
 424
 425         if (fb_logo.needs_cmapreset)
 426                 fb_set_logocmap(info, fb_logo.logo);
 427
 428         if (fb_logo.needs_truepalette ||
 429             fb_logo.needs_directpalette) {
 430                 palette = kmalloc(256 * 4, GFP_KERNEL);
 431                 if (palette == NULL)
 432                         return 0;
 433
 434                 if (fb_logo.needs_truepalette)
 435                         fb_set_logo_truepalette(info, fb_logo.logo, palette);
 436                 else
 437                         fb_set_logo_directpalette(info, fb_logo.logo, palette);
 438
 439                 saved_pseudo_palette = info->pseudo_palette;
 440                 info->pseudo_palette = palette;
 441         }
 442
 443         if (fb_logo.depth <= 4) {
 444                 logo_new = kmalloc(fb_logo.logo->width * fb_logo.logo->height,
 445                                    GFP_KERNEL);
 446                 if (logo_new == NULL) {
 447                         if (palette)
 448                                 kfree(palette);
 449                         if (saved_pseudo_palette)
 450                                 info->pseudo_palette = saved_pseudo_palette;
 451                         return 0;
 452                 }
 453                 image.data = logo_new;
 454                 fb_set_logo(info, fb_logo.logo, logo_new, fb_logo.depth);
 455         }
 456
 457         image.width = fb_logo.logo->width;
 458         image.height = fb_logo.logo->height;
 459         image.dy = 0;
 460
 461         for (x = 0; x < num_online_cpus() * (fb_logo.logo->width + 8) &&
 462              x <= info->var.xres-fb_logo.logo->width; x += (fb_logo.logo->width + 8)) {
 463                 image.dx = x;
 464                 info->fbops->fb_imageblit(info, &image);
 465         }
 466
 467         if (palette != NULL)
 468                 kfree(palette);
 469         if (saved_pseudo_palette != NULL)
 470                 info->pseudo_palette = saved_pseudo_palette;
 471         if (logo_new != NULL)
 472                 kfree(logo_new);
 473         return fb_logo.logo->height;
 474 }
 475 #else
 476 int fb_prepare_logo(struct fb_info *info) { return 0; }
 477 int fb_show_logo(struct fb_info *info) { return 0; }
 478 #endif /* CONFIG_LOGO */
 479
 480 static int fbmem_read_proc(char *buf, char **start, off_t offset,
 481                            int len, int *eof, void *private)
 482 {
 483         struct fb_info **fi;
 484         int clen;
 485
 486         clen = 0;
 487         for (fi = registered_fb; fi < &registered_fb[FB_MAX] && len < 4000; fi++)
 488                 if (*fi)
 489                         clen += sprintf(buf + clen, "%d %s\n",
 490                                         (*fi)->node,
 491                                         (*fi)->fix.id);
 492         *start = buf + offset;
 493         if (clen > offset)
 494                 clen -= offset;
 495         else
 496                 clen = 0;
 497         return clen < len ? clen : len;
 498 }
 499
 500 static ssize_t
 501 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 502 {
 503         unsigned long p = *ppos;
 504         struct inode *inode = file->f_dentry->d_inode;
 505         int fbidx = iminor(inode);
 506         struct fb_info *info = registered_fb[fbidx];
 507         u32 *buffer, *dst, *src;
 508         int c, i, cnt = 0, err = 0;
 509         unsigned long total_size;
 510
 511         if (!info || ! info->screen_base)
 512                 return -ENODEV;
 513
 514         if (info->state != FBINFO_STATE_RUNNING)
 515                 return -EPERM;
 516
 517         if (info->fbops->fb_read)
 518                 return info->fbops->fb_read(file, buf, count, ppos);
 519
 520         total_size = info->screen_size;
 521         if (total_size == 0)
 522                 total_size = info->fix.smem_len;
 523
 524         if (p >= total_size)
 525             return 0;
 526         if (count >= total_size)
 527             count = total_size;
 528         if (count + p > total_size)
 529                 count = total_size - p;
 530
 531         cnt = 0;
 532         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 533                          GFP_KERNEL);
 534         if (!buffer)
 535                 return -ENOMEM;
 536
 537         src = (u32 *) (info->screen_base + p);
 538
 539         if (info->fbops->fb_sync)
 540                 info->fbops->fb_sync(info);
 541
 542         while (count) {
 543                 c  = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 544                 dst = buffer;
 545                 for (i = c >> 2; i--; )
 546                         *dst++ = fb_readl(src++);
 547                 if (c & 3) {
 548                         u8 *dst8 = (u8 *) dst;
 549                         u8 *src8 = (u8 *) src;
 550
 551                         for (i = c & 3; i--;)
 552                                 *dst8++ = fb_readb(src8++);
 553
 554                         src = (u32 *) src8;
 555                 }
 556
 557                 if (copy_to_user(buf, buffer, c)) {
 558                         err = -EFAULT;
 559                         break;
 560                 }
 561                 *ppos += c;
 562                 buf += c;
 563                 cnt += c;
 564                 count -= c;
 565         }
 566
 567         kfree(buffer);
 568         return (err) ? err : cnt;
 569 }
 570
 571 static ssize_t
 572 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 573 {
 574         unsigned long p = *ppos;
 575         struct inode *inode = file->f_dentry->d_inode;
 576         int fbidx = iminor(inode);
 577         struct fb_info *info = registered_fb[fbidx];
 578         u32 *buffer, *dst, *src;
 579         int c, i, cnt = 0, err;
 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_write)
 589                 return info->fbops->fb_write(file, buf, count, ppos);
 590
 591         total_size = info->screen_size;
 592         if (total_size == 0)
 593                 total_size = info->fix.smem_len;
 594
 595         if (p > total_size)
 596             return -ENOSPC;
 597         if (count >= total_size)
 598             count = total_size;
 599         err = 0;
 600         if (count + p > total_size) {
 601             count = total_size - p;
 602             err = -ENOSPC;
 603         }
 604         cnt = 0;
 605         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 606                          GFP_KERNEL);
 607         if (!buffer)
 608                 return -ENOMEM;
 609
 610         dst = (u32 *) (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                 src = buffer;
 618                 if (copy_from_user(src, buf, c)) {
 619                         err = -EFAULT;
 620                         break;
 621                 }
 622                 for (i = c >> 2; i--; )
 623                         fb_writel(*src++, dst++);
 624                 if (c & 3) {
 625                         u8 *src8 = (u8 *) src;
 626                         u8 *dst8 = (u8 *) dst;
 627
 628                         for (i = c & 3; i--; )
 629                                 fb_writeb(*src8++, dst8++);
 630
 631                         dst = (u32 *) dst8;
 632                 }
 633                 *ppos += c;
 634                 buf += c;
 635                 cnt += c;
 636                 count -= c;
 637         }
 638         kfree(buffer);
 639
 640         return (err) ? err : cnt;
 641 }
 642
 643 #ifdef CONFIG_KMOD
 644 static void try_to_load(int fb)
 645 {
 646         request_module("fb%d", fb);
 647 }
 648 #endif /* CONFIG_KMOD */
 649
 650 void
 651 fb_load_cursor_image(struct fb_info *info)
 652 {
 653         unsigned int width = (info->cursor.image.width + 7) >> 3;
 654         u8 *data = (u8 *) info->cursor.image.data;
 655
 656         if (info->sprite.outbuf)
 657             info->sprite.outbuf(info, info->sprite.addr, data, width);
 658         else
 659             memcpy(info->sprite.addr, data, width);
 660 }
 661
 662 int
 663 fb_cursor(struct fb_info *info, struct fb_cursor_user __user *sprite)
 664 {
 665         struct fb_cursor_user cursor_user;
 666         struct fb_cursor cursor;
 667         char *data = NULL, *mask = NULL, *info_mask = NULL;
 668         u16 *red = NULL, *green = NULL, *blue = NULL, *transp = NULL;
 669         int err = -EINVAL;
 670
 671         if (copy_from_user(&cursor_user, sprite, sizeof(struct fb_cursor_user)))
 672                 return -EFAULT;
 673
 674         memcpy(&cursor, &cursor_user, sizeof(cursor_user));
 675         cursor.mask = info->cursor.mask;
 676         cursor.image.data = info->cursor.image.data;
 677         cursor.image.cmap.red = info->cursor.image.cmap.red;
 678         cursor.image.cmap.green = info->cursor.image.cmap.green;
 679         cursor.image.cmap.blue = info->cursor.image.cmap.blue;
 680         cursor.image.cmap.transp = info->cursor.image.cmap.transp;
 681         cursor.data = NULL;
 682
 683         if (cursor.set & FB_CUR_SETCUR)
 684                 info->cursor.enable = 1;
 685
 686         if (cursor.set & FB_CUR_SETCMAP) {
 687                 unsigned len = cursor.image.cmap.len;
 688                 if ((int)len <= 0)
 689                         goto out;
 690                 len *= 2;
 691                 err = -ENOMEM;
 692                 red = kmalloc(len, GFP_USER);
 693                 green = kmalloc(len, GFP_USER);
 694                 blue = kmalloc(len, GFP_USER);
 695                 if (!red || !green || !blue)
 696                         goto out;
 697                 if (cursor_user.image.cmap.transp) {
 698                         transp = kmalloc(len, GFP_USER);
 699                         if (!transp)
 700                                 goto out;
 701                 }
 702                 err = -EFAULT;
 703                 if (copy_from_user(red, cursor_user.image.cmap.red, len))
 704                         goto out;
 705                 if (copy_from_user(green, cursor_user.image.cmap.green, len))
 706                         goto out;
 707                 if (copy_from_user(blue, cursor_user.image.cmap.blue, len))
 708                         goto out;
 709                 if (transp) {
 710                         if (copy_from_user(transp,
 711                                            cursor_user.image.cmap.transp, len))
 712                                 goto out;
 713                 }
 714                 cursor.image.cmap.red = red;
 715                 cursor.image.cmap.green = green;
 716                 cursor.image.cmap.blue = blue;
 717                 cursor.image.cmap.transp = transp;
 718         }
 719
 720         if (cursor.set & FB_CUR_SETSHAPE) {
 721                 int size = ((cursor.image.width + 7) >> 3) * cursor.image.height;
 722
 723                 if ((cursor.image.height != info->cursor.image.height) ||
 724                     (cursor.image.width != info->cursor.image.width))
 725                         cursor.set |= FB_CUR_SETSIZE;
 726
 727                 err = -ENOMEM;
 728                 data = kmalloc(size, GFP_USER);
 729                 mask = kmalloc(size, GFP_USER);
 730                 if (!mask || !data)
 731                         goto out;
 732
 733                 err = -EFAULT;
 734                 if (copy_from_user(data, cursor_user.image.data, size) ||
 735                     copy_from_user(mask, cursor_user.mask, size))
 736                         goto out;
 737
 738                 cursor.image.data = data;
 739                 cursor.mask = mask;
 740                 info_mask = (char *) info->cursor.mask;
 741                 info->cursor.mask = mask;
 742         }
 743         info->cursor.set = cursor.set;
 744         info->cursor.rop = cursor.rop;
 745         err = info->fbops->fb_cursor(info, &cursor);
 746 out:
 747         kfree(data);
 748         kfree(mask);
 749         kfree(red);
 750         kfree(green);
 751         kfree(blue);
 752         kfree(transp);
 753         if (info_mask)
 754                 info->cursor.mask = info_mask;
 755         return err;
 756 }
 757
 758 int
 759 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
 760 {
 761         int xoffset = var->xoffset;
 762         int yoffset = var->yoffset;
 763         int err;
 764
 765         if (xoffset < 0 || yoffset < 0 || !info->fbops->fb_pan_display ||
 766             xoffset + info->var.xres > info->var.xres_virtual ||
 767             yoffset + info->var.yres > info->var.yres_virtual)
 768                 return -EINVAL;
 769         if ((err = info->fbops->fb_pan_display(var, info)))
 770                 return err;
 771         info->var.xoffset = var->xoffset;
 772         info->var.yoffset = var->yoffset;
 773         if (var->vmode & FB_VMODE_YWRAP)
 774                 info->var.vmode |= FB_VMODE_YWRAP;
 775         else
 776                 info->var.vmode &= ~FB_VMODE_YWRAP;
 777         return 0;
 778 }
 779
 780 int
 781 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
 782 {
 783         int err;
 784
 785         if (var->activate & FB_ACTIVATE_INV_MODE) {
 786                 struct fb_videomode mode1, mode2;
 787                 int ret = 0;
 788
 789                 fb_var_to_videomode(&mode1, var);
 790                 fb_var_to_videomode(&mode2, &info->var);
 791                 /* make sure we don't delete the videomode of current var */
 792                 ret = fb_mode_is_equal(&mode1, &mode2);
 793
 794                 if (!ret) {
 795                     struct fb_event event;
 796
 797                     event.info = info;
 798                     event.data = &mode1;
 799                     ret = notifier_call_chain(&fb_notifier_list,
 800                                               FB_EVENT_MODE_DELETE, &event);
 801                 }
 802
 803                 if (!ret)
 804                     fb_delete_videomode(&mode1, &info->modelist);
 805
 806                 return ret;
 807         }
 808
 809         if ((var->activate & FB_ACTIVATE_FORCE) ||
 810             memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
 811                 if (!info->fbops->fb_check_var) {
 812                         *var = info->var;
 813                         return 0;
 814                 }
 815
 816                 if ((err = info->fbops->fb_check_var(var, info)))
 817                         return err;
 818
 819                 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
 820                         struct fb_videomode mode;
 821                         info->var = *var;
 822
 823                         if (info->fbops->fb_set_par)
 824                                 info->fbops->fb_set_par(info);
 825
 826                         fb_pan_display(info, &info->var);
 827
 828                         fb_set_cmap(&info->cmap, info);
 829
 830                         fb_var_to_videomode(&mode, &info->var);
 831                         fb_add_videomode(&mode, &info->modelist);
 832
 833                         if (info->flags & FBINFO_MISC_MODECHANGEUSER) {
 834                                 struct fb_event event;
 835
 836                                 info->flags &= ~FBINFO_MISC_MODECHANGEUSER;
 837                                 event.info = info;
 838                                 notifier_call_chain(&fb_notifier_list,
 839                                                     FB_EVENT_MODE_CHANGE, &event);
 840                         }
 841                 }
 842         }
 843         return 0;
 844 }
 845
 846 int
 847 fb_blank(struct fb_info *info, int blank)
 848 {
 849         /* ??? Variable sized stack allocation.  */
 850         u16 black[info->cmap.len];
 851         struct fb_cmap cmap;
 852
 853         if (info->fbops->fb_blank && !info->fbops->fb_blank(blank, info))
 854                 return 0;
 855         if (blank) {
 856                 memset(black, 0, info->cmap.len * sizeof(u16));
 857                 cmap.red = cmap.green = cmap.blue = black;
 858                 cmap.transp = info->cmap.transp ? black : NULL;
 859                 cmap.start = info->cmap.start;
 860                 cmap.len = info->cmap.len;
 861         } else
 862                 cmap = info->cmap;
 863         return fb_set_cmap(&cmap, info);
 864 }
 865
 866 static int
 867 fb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
 868          unsigned long arg)
 869 {
 870         int fbidx = iminor(inode);
 871         struct fb_info *info = registered_fb[fbidx];
 872         struct fb_ops *fb = info->fbops;
 873         struct fb_var_screeninfo var;
 874         struct fb_fix_screeninfo fix;
 875         struct fb_con2fbmap con2fb;
 876         struct fb_cmap_user cmap;
 877         struct fb_event event;
 878         void __user *argp = (void __user *)arg;
 879         int i;
 880
 881         if (!fb)
 882                 return -ENODEV;
 883         switch (cmd) {
 884         case FBIOGET_VSCREENINFO:
 885                 return copy_to_user(argp, &info->var,
 886                                     sizeof(var)) ? -EFAULT : 0;
 887         case FBIOPUT_VSCREENINFO:
 888                 if (copy_from_user(&var, argp, sizeof(var)))
 889                         return -EFAULT;
 890                 acquire_console_sem();
 891                 info->flags |= FBINFO_MISC_MODECHANGEUSER;
 892                 i = fb_set_var(info, &var);
 893                 info->flags &= ~FBINFO_MISC_MODECHANGEUSER;
 894                 release_console_sem();
 895                 if (i) return i;
 896                 if (copy_to_user(argp, &var, sizeof(var)))
 897                         return -EFAULT;
 898                 return 0;
 899         case FBIOGET_FSCREENINFO:
 900                 return copy_to_user(argp, &info->fix,
 901                                     sizeof(fix)) ? -EFAULT : 0;
 902         case FBIOPUTCMAP:
 903                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
 904                         return -EFAULT;
 905                 return (fb_set_user_cmap(&cmap, info));
 906         case FBIOGETCMAP:
 907                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
 908                         return -EFAULT;
 909                 return fb_cmap_to_user(&info->cmap, &cmap);
 910         case FBIOPAN_DISPLAY:
 911                 if (copy_from_user(&var, argp, sizeof(var)))
 912                         return -EFAULT;
 913                 acquire_console_sem();
 914                 i = fb_pan_display(info, &var);
 915                 release_console_sem();
 916                 if (i)
 917                         return i;
 918                 if (copy_to_user(argp, &var, sizeof(var)))
 919                         return -EFAULT;
 920                 return 0;
 921         case FBIO_CURSOR:
 922                 acquire_console_sem();
 923                 i = fb_cursor(info, argp);
 924                 release_console_sem();
 925                 return i;
 926         case FBIOGET_CON2FBMAP:
 927                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
 928                         return -EFAULT;
 929                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
 930                     return -EINVAL;
 931                 con2fb.framebuffer = -1;
 932                 event.info = info;
 933                 event.data = &con2fb;
 934                 notifier_call_chain(&fb_notifier_list,
 935                                     FB_EVENT_GET_CONSOLE_MAP, &event);
 936                 return copy_to_user(argp, &con2fb,
 937                                     sizeof(con2fb)) ? -EFAULT : 0;
 938         case FBIOPUT_CON2FBMAP:
 939                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
 940                         return - EFAULT;
 941                 if (con2fb.console < 0 || con2fb.console > MAX_NR_CONSOLES)
 942                     return -EINVAL;
 943                 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
 944                     return -EINVAL;
 945 #ifdef CONFIG_KMOD
 946                 if (!registered_fb[con2fb.framebuffer])
 947                     try_to_load(con2fb.framebuffer);
 948 #endif /* CONFIG_KMOD */
 949                 if (!registered_fb[con2fb.framebuffer])
 950                     return -EINVAL;
 951                 if (con2fb.console > 0 && con2fb.console < MAX_NR_CONSOLES) {
 952                         event.info = info;
 953                         event.data = &con2fb;
 954                         return notifier_call_chain(&fb_notifier_list,
 955                                                    FB_EVENT_SET_CONSOLE_MAP,
 956                                                    &event);
 957                 }
 958                 return -EINVAL;
 959         case FBIOBLANK:
 960                 acquire_console_sem();
 961                 i = fb_blank(info, arg);
 962                 release_console_sem();
 963                 return i;
 964         default:
 965                 if (fb->fb_ioctl == NULL)
 966                         return -EINVAL;
 967                 return fb->fb_ioctl(inode, file, cmd, arg, info);
 968         }
 969 }
 970
 971 static int
 972 fb_mmap(struct file *file, struct vm_area_struct * vma)
 973 {
 974         int fbidx = iminor(file->f_dentry->d_inode);
 975         struct fb_info *info = registered_fb[fbidx];
 976         struct fb_ops *fb = info->fbops;
 977         unsigned long off;
 978 #if !defined(__sparc__) || defined(__sparc_v9__)
 979         unsigned long start;
 980         u32 len;
 981 #endif
 982
 983         if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
 984                 return -EINVAL;
 985         off = vma->vm_pgoff << PAGE_SHIFT;
 986         if (!fb)
 987                 return -ENODEV;
 988         if (fb->fb_mmap) {
 989                 int res;
 990                 lock_kernel();
 991                 res = fb->fb_mmap(info, file, vma);
 992                 unlock_kernel();
 993                 return res;
 994         }
 995
 996 #if defined(__sparc__) && !defined(__sparc_v9__)
 997         /* Should never get here, all fb drivers should have their own
 998            mmap routines */
 999         return -EINVAL;
1000 #else
1001         /* !sparc32... */
1002         lock_kernel();
1003
1004         /* frame buffer memory */
1005         start = info->fix.smem_start;
1006         len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
1007         if (off >= len) {
1008                 /* memory mapped io */
1009                 off -= len;
1010                 if (info->var.accel_flags) {
1011                         unlock_kernel();
1012                         return -EINVAL;
1013                 }
1014                 start = info->fix.mmio_start;
1015                 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
1016         }
1017         unlock_kernel();
1018         start &= PAGE_MASK;
1019         if ((vma->vm_end - vma->vm_start + off) > len)
1020                 return -EINVAL;
1021         off += start;
1022         vma->vm_pgoff = off >> PAGE_SHIFT;
1023         /* This is an IO map - tell maydump to skip this VMA */
1024         vma->vm_flags |= VM_IO;
1025 #if defined(__sparc_v9__)
1026         vma->vm_flags |= (VM_SHM | VM_LOCKED);
1027         if (io_remap_page_range(vma, vma->vm_start, off,
1028                                 vma->vm_end - vma->vm_start, vma->vm_page_prot, 0))
1029                 return -EAGAIN;
1030 #else
1031 #if defined(__mc68000__)
1032 #if defined(CONFIG_SUN3)
1033         pgprot_val(vma->vm_page_prot) |= SUN3_PAGE_NOCACHE;
1034 #elif defined(CONFIG_MMU)
1035         if (CPU_IS_020_OR_030)
1036                 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE030;
1037         if (CPU_IS_040_OR_060) {
1038                 pgprot_val(vma->vm_page_prot) &= _CACHEMASK040;
1039                 /* Use no-cache mode, serialized */
1040                 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE_S;
1041         }
1042 #endif
1043 #elif defined(__powerpc__)
1044         pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE|_PAGE_GUARDED;
1045 #elif defined(__alpha__)
1046         /* Caching is off in the I/O space quadrant by design.  */
1047 #elif defined(__i386__) || defined(__x86_64__)
1048         if (boot_cpu_data.x86 > 3)
1049                 pgprot_val(vma->vm_page_prot) |= _PAGE_PCD;
1050 #elif defined(__mips__)
1051         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1052 #elif defined(__hppa__)
1053         pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
1054 #elif defined(__ia64__) || defined(__arm__) || defined(__sh__)
1055         vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
1056 #else
1057 #warning What do we have to do here??
1058 #endif
1059         if (io_remap_page_range(vma, vma->vm_start, off,
1060                              vma->vm_end - vma->vm_start, vma->vm_page_prot))
1061                 return -EAGAIN;
1062 #endif /* !__sparc_v9__ */
1063         return 0;
1064 #endif /* !sparc32 */
1065 }
1066
1067 static int
1068 fb_open(struct inode *inode, struct file *file)
1069 {
1070         int fbidx = iminor(inode);
1071         struct fb_info *info;
1072         int res = 0;
1073
1074         if (fbidx >= FB_MAX)
1075                 return -ENODEV;
1076 #ifdef CONFIG_KMOD
1077         if (!(info = registered_fb[fbidx]))
1078                 try_to_load(fbidx);
1079 #endif /* CONFIG_KMOD */
1080         if (!(info = registered_fb[fbidx]))
1081                 return -ENODEV;
1082         if (!try_module_get(info->fbops->owner))
1083                 return -ENODEV;
1084         if (info->fbops->fb_open) {
1085                 res = info->fbops->fb_open(info,1);
1086                 if (res)
1087                         module_put(info->fbops->owner);
1088         }
1089         return res;
1090 }
1091
1092 static int
1093 fb_release(struct inode *inode, struct file *file)
1094 {
1095         int fbidx = iminor(inode);
1096         struct fb_info *info;
1097
1098         lock_kernel();
1099         info = registered_fb[fbidx];
1100         if (info->fbops->fb_release)
1101                 info->fbops->fb_release(info,1);
1102         module_put(info->fbops->owner);
1103         unlock_kernel();
1104         return 0;
1105 }
1106
1107 static struct file_operations fb_fops = {
1108         .owner =        THIS_MODULE,
1109         .read =         fb_read,
1110         .write =        fb_write,
1111         .ioctl =        fb_ioctl,
1112         .mmap =         fb_mmap,
1113         .open =         fb_open,
1114         .release =      fb_release,
1115 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1116         .get_unmapped_area = get_fb_unmapped_area,
1117 #endif
1118 };
1119
1120 static struct class_simple *fb_class;
1121
1122 /**
1123  *      register_framebuffer - registers a frame buffer device
1124  *      @fb_info: frame buffer info structure
1125  *
1126  *      Registers a frame buffer device @fb_info.
1127  *
1128  *      Returns negative errno on error, or zero for success.
1129  *
1130  */
1131
1132 int
1133 register_framebuffer(struct fb_info *fb_info)
1134 {
1135         int i;
1136         struct class_device *c;
1137         struct fb_event event;
1138
1139         if (num_registered_fb == FB_MAX)
1140                 return -ENXIO;
1141         num_registered_fb++;
1142         for (i = 0 ; i < FB_MAX; i++)
1143                 if (!registered_fb[i])
1144                         break;
1145         fb_info->node = i;
1146
1147         c = class_simple_device_add(fb_class, MKDEV(FB_MAJOR, i), NULL, "fb%d", i);
1148         if (IS_ERR(c)) {
1149                 /* Not fatal */
1150                 printk(KERN_WARNING "Unable to create class_device for framebuffer %d; errno = %ld\n", i, PTR_ERR(c));
1151         }
1152
1153         if (fb_info->pixmap.addr == NULL) {
1154                 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1155                 if (fb_info->pixmap.addr) {
1156                         fb_info->pixmap.size = FBPIXMAPSIZE;
1157                         fb_info->pixmap.buf_align = 1;
1158                         fb_info->pixmap.scan_align = 1;
1159                         fb_info->pixmap.access_align = 4;
1160                         fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1161                 }
1162         }
1163         fb_info->pixmap.offset = 0;
1164
1165         if (fb_info->sprite.addr == NULL) {
1166                 fb_info->sprite.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1167                 if (fb_info->sprite.addr) {
1168                         fb_info->sprite.size = FBPIXMAPSIZE;
1169                         fb_info->sprite.buf_align = 1;
1170                         fb_info->sprite.scan_align = 1;
1171                         fb_info->sprite.access_align = 4;
1172                         fb_info->sprite.flags = FB_PIXMAP_DEFAULT;
1173                 }
1174         }
1175         fb_info->sprite.offset = 0;
1176
1177         if (!fb_info->modelist.prev ||
1178             !fb_info->modelist.next ||
1179             list_empty(&fb_info->modelist)) {
1180                 struct fb_videomode mode;
1181
1182                 INIT_LIST_HEAD(&fb_info->modelist);
1183                 fb_var_to_videomode(&mode, &fb_info->var);
1184                 fb_add_videomode(&mode, &fb_info->modelist);
1185         }
1186
1187         registered_fb[i] = fb_info;
1188
1189         devfs_mk_cdev(MKDEV(FB_MAJOR, i),
1190                         S_IFCHR | S_IRUGO | S_IWUGO, "fb/%d", i);
1191         event.info = fb_info;
1192         notifier_call_chain(&fb_notifier_list,
1193                             FB_EVENT_FB_REGISTERED, &event);
1194         return 0;
1195 }
1196
1197
1198 /**
1199  *      unregister_framebuffer - releases a frame buffer device
1200  *      @fb_info: frame buffer info structure
1201  *
1202  *      Unregisters a frame buffer device @fb_info.
1203  *
1204  *      Returns negative errno on error, or zero for success.
1205  *
1206  */
1207
1208 int
1209 unregister_framebuffer(struct fb_info *fb_info)
1210 {
1211         int i;
1212
1213         i = fb_info->node;
1214         if (!registered_fb[i])
1215                 return -EINVAL;
1216         devfs_remove("fb/%d", i);
1217
1218         if (fb_info->pixmap.addr && (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1219                 kfree(fb_info->pixmap.addr);
1220         if (fb_info->sprite.addr && (fb_info->sprite.flags & FB_PIXMAP_DEFAULT))
1221                 kfree(fb_info->sprite.addr);
1222         fb_destroy_modelist(&fb_info->modelist);
1223         registered_fb[i]=NULL;
1224         num_registered_fb--;
1225         class_simple_device_remove(MKDEV(FB_MAJOR, i));
1226         return 0;
1227 }
1228
1229 /**
1230  *      fb_register_client - register a client notifier
1231  *      @nb: notifier block to callback on events
1232  */
1233 int fb_register_client(struct notifier_block *nb)
1234 {
1235         return notifier_chain_register(&fb_notifier_list, nb);
1236 }
1237
1238 /**
1239  *      fb_unregister_client - unregister a client notifier
1240  *      @nb: notifier block to callback on events
1241  */
1242 int fb_unregister_client(struct notifier_block *nb)
1243 {
1244         return notifier_chain_unregister(&fb_notifier_list, nb);
1245 }
1246
1247 /**
1248  *      fb_set_suspend - low level driver signals suspend
1249  *      @info: framebuffer affected
1250  *      @state: 0 = resuming, !=0 = suspending
1251  *
1252  *      This is meant to be used by low level drivers to
1253  *      signal suspend/resume to the core & clients.
1254  *      It must be called with the console semaphore held
1255  */
1256 void fb_set_suspend(struct fb_info *info, int state)
1257 {
1258         struct fb_event event;
1259
1260         event.info = info;
1261         if (state) {
1262                 notifier_call_chain(&fb_notifier_list, FB_EVENT_SUSPEND, &event);
1263                 info->state = FBINFO_STATE_SUSPENDED;
1264         } else {
1265                 info->state = FBINFO_STATE_RUNNING;
1266                 notifier_call_chain(&fb_notifier_list, FB_EVENT_RESUME, &event);
1267         }
1268 }
1269
1270 /**
1271  *      fbmem_init - init frame buffer subsystem
1272  *
1273  *      Initialize the frame buffer subsystem.
1274  *
1275  *      NOTE: This function is _only_ to be called by drivers/char/mem.c.
1276  *
1277  */
1278
1279 int __init
1280 fbmem_init(void)
1281 {
1282         create_proc_read_entry("fb", 0, NULL, fbmem_read_proc, NULL);
1283
1284         devfs_mk_dir("fb");
1285         if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1286                 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1287
1288         fb_class = class_simple_create(THIS_MODULE, "graphics");
1289         if (IS_ERR(fb_class)) {
1290                 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1291                 fb_class = NULL;
1292         }
1293         return 0;
1294 }
1295 module_init(fbmem_init);
1296
1297 #define NR_FB_DRIVERS 64
1298 static char *video_options[NR_FB_DRIVERS];
1299 static int ofonly;
1300
1301 /**
1302  * fb_get_options - get kernel boot parameters
1303  * @name - framebuffer name as it would appear in
1304  *         the boot parameter line
1305  *         (video=<name>:<options>)
1306  *
1307  * NOTE: Needed to maintain backwards compatibility
1308  */
1309 int fb_get_options(char *name, char **option)
1310 {
1311         char *opt, *options = NULL;
1312         int opt_len, retval = 0;
1313         int name_len = strlen(name), i;
1314
1315         if (name_len && ofonly && strncmp(name, "offb", 4))
1316                 retval = 1;
1317
1318         if (name_len && !retval) {
1319                 for (i = 0; i < NR_FB_DRIVERS; i++) {
1320                         if (video_options[i] == NULL)
1321                                 continue;
1322                         opt_len = strlen(video_options[i]);
1323                         if (!opt_len)
1324                                 continue;
1325                         opt = video_options[i];
1326                         if (!strncmp(name, opt, name_len) &&
1327                             opt[name_len] == ':')
1328                                 options = opt + name_len + 1;
1329                 }
1330         }
1331         if (options && !strncmp(options, "off", 3))
1332                 retval = 1;
1333
1334         if (option)
1335                 *option = options;
1336
1337         return retval;
1338 }
1339
1340 /**
1341  *      video_setup - process command line options
1342  *      @options: string of options
1343  *
1344  *      Process command line options for frame buffer subsystem.
1345  *
1346  *      NOTE: This function is a __setup and __init function.
1347  *            It only stores the options.  Drivers have to call
1348  *            fb_get_options() as necessary.
1349  *
1350  *      Returns zero.
1351  *
1352  */
1353
1354 int __init video_setup(char *options)
1355 {
1356         int i;
1357
1358         if (!options || !*options)
1359                 return 0;
1360
1361         for (i = 0; i < NR_FB_DRIVERS; i++) {
1362                 if (!strncmp(options, "ofonly", 6))
1363                         ofonly = 1;
1364                 if (video_options[i] == NULL) {
1365                         video_options[i] = options;
1366                         break;
1367                 }
1368         }
1369
1370         return 0;
1371 }
1372 __setup("video=", video_setup);
1373
1374     /*
1375      *  Visible symbols for modules
1376      */
1377
1378 EXPORT_SYMBOL(register_framebuffer);
1379 EXPORT_SYMBOL(unregister_framebuffer);
1380 EXPORT_SYMBOL(num_registered_fb);
1381 EXPORT_SYMBOL(registered_fb);
1382 EXPORT_SYMBOL(fb_prepare_logo);
1383 EXPORT_SYMBOL(fb_show_logo);
1384 EXPORT_SYMBOL(fb_set_var);
1385 EXPORT_SYMBOL(fb_blank);
1386 EXPORT_SYMBOL(fb_pan_display);
1387 EXPORT_SYMBOL(fb_get_buffer_offset);
1388 EXPORT_SYMBOL(fb_iomove_buf_unaligned);
1389 EXPORT_SYMBOL(fb_iomove_buf_aligned);
1390 EXPORT_SYMBOL(fb_sysmove_buf_unaligned);
1391 EXPORT_SYMBOL(fb_sysmove_buf_aligned);
1392 EXPORT_SYMBOL(fb_load_cursor_image);
1393 EXPORT_SYMBOL(fb_set_suspend);
1394 EXPORT_SYMBOL(fb_register_client);
1395 EXPORT_SYMBOL(fb_unregister_client);
1396 EXPORT_SYMBOL(fb_get_options);
1397
1398 MODULE_LICENSE("GPL");