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