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/smp_lock.h>
  20 #include <linux/kernel.h>
  21 #include <linux/major.h>
  22 #include <linux/slab.h>
  23 #include <linux/mm.h>
  24 #include <linux/mman.h>
  25 #include <linux/vt.h>
  26 #include <linux/init.h>
  27 #include <linux/linux_logo.h>
  28 #include <linux/proc_fs.h>
  29 #include <linux/seq_file.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 #include <linux/fb.h>
  38 #include <linux/major.h>
  39
  40 #include <asm/fb.h>
  41
  42
  43     /*
  44      *  Frame buffer device initialization and setup routines
  45      */
  46
  47 #define FBPIXMAPSIZE    (1024 * 8)
  48
  49 struct fb_info *registered_fb[FB_MAX] __read_mostly;
  50 int num_registered_fb __read_mostly;
  51
  52 /*
  53  * Helpers
  54  */
  55
  56 int fb_get_color_depth(struct fb_var_screeninfo *var,
  57                        struct fb_fix_screeninfo *fix)
  58 {
  59         int depth = 0;
  60
  61         if (fix->visual == FB_VISUAL_MONO01 ||
  62             fix->visual == FB_VISUAL_MONO10)
  63                 depth = 1;
  64         else {
  65                 if (var->green.length == var->blue.length &&
  66                     var->green.length == var->red.length &&
  67                     var->green.offset == var->blue.offset &&
  68                     var->green.offset == var->red.offset)
  69                         depth = var->green.length;
  70                 else
  71                         depth = var->green.length + var->red.length +
  72                                 var->blue.length;
  73         }
  74
  75         return depth;
  76 }
  77 EXPORT_SYMBOL(fb_get_color_depth);
  78
  79 /*
  80  * Data padding functions.
  81  */
  82 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
  83 {
  84         __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
  85 }
  86 EXPORT_SYMBOL(fb_pad_aligned_buffer);
  87
  88 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
  89                                 u32 shift_high, u32 shift_low, u32 mod)
  90 {
  91         u8 mask = (u8) (0xfff << shift_high), tmp;
  92         int i, j;
  93
  94         for (i = height; i--; ) {
  95                 for (j = 0; j < idx; j++) {
  96                         tmp = dst[j];
  97                         tmp &= mask;
  98                         tmp |= *src >> shift_low;
  99                         dst[j] = tmp;
 100                         tmp = *src << shift_high;
 101                         dst[j+1] = tmp;
 102                         src++;
 103                 }
 104                 tmp = dst[idx];
 105                 tmp &= mask;
 106                 tmp |= *src >> shift_low;
 107                 dst[idx] = tmp;
 108                 if (shift_high < mod) {
 109                         tmp = *src << shift_high;
 110                         dst[idx+1] = tmp;
 111                 }
 112                 src++;
 113                 dst += d_pitch;
 114         }
 115 }
 116 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
 117
 118 /*
 119  * we need to lock this section since fb_cursor
 120  * may use fb_imageblit()
 121  */
 122 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
 123 {
 124         u32 align = buf->buf_align - 1, offset;
 125         char *addr = buf->addr;
 126
 127         /* If IO mapped, we need to sync before access, no sharing of
 128          * the pixmap is done
 129          */
 130         if (buf->flags & FB_PIXMAP_IO) {
 131                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 132                         info->fbops->fb_sync(info);
 133                 return addr;
 134         }
 135
 136         /* See if we fit in the remaining pixmap space */
 137         offset = buf->offset + align;
 138         offset &= ~align;
 139         if (offset + size > buf->size) {
 140                 /* We do not fit. In order to be able to re-use the buffer,
 141                  * we must ensure no asynchronous DMA'ing or whatever operation
 142                  * is in progress, we sync for that.
 143                  */
 144                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 145                         info->fbops->fb_sync(info);
 146                 offset = 0;
 147         }
 148         buf->offset = offset + size;
 149         addr += offset;
 150
 151         return addr;
 152 }
 153
 154 #ifdef CONFIG_LOGO
 155
 156 static inline unsigned safe_shift(unsigned d, int n)
 157 {
 158         return n < 0 ? d >> -n : d << n;
 159 }
 160
 161 static void fb_set_logocmap(struct fb_info *info,
 162                                    const struct linux_logo *logo)
 163 {
 164         struct fb_cmap palette_cmap;
 165         u16 palette_green[16];
 166         u16 palette_blue[16];
 167         u16 palette_red[16];
 168         int i, j, n;
 169         const unsigned char *clut = logo->clut;
 170
 171         palette_cmap.start = 0;
 172         palette_cmap.len = 16;
 173         palette_cmap.red = palette_red;
 174         palette_cmap.green = palette_green;
 175         palette_cmap.blue = palette_blue;
 176         palette_cmap.transp = NULL;
 177
 178         for (i = 0; i < logo->clutsize; i += n) {
 179                 n = logo->clutsize - i;
 180                 /* palette_cmap provides space for only 16 colors at once */
 181                 if (n > 16)
 182                         n = 16;
 183                 palette_cmap.start = 32 + i;
 184                 palette_cmap.len = n;
 185                 for (j = 0; j < n; ++j) {
 186                         palette_cmap.red[j] = clut[0] << 8 | clut[0];
 187                         palette_cmap.green[j] = clut[1] << 8 | clut[1];
 188                         palette_cmap.blue[j] = clut[2] << 8 | clut[2];
 189                         clut += 3;
 190                 }
 191                 fb_set_cmap(&palette_cmap, info);
 192         }
 193 }
 194
 195 static void  fb_set_logo_truepalette(struct fb_info *info,
 196                                             const struct linux_logo *logo,
 197                                             u32 *palette)
 198 {
 199         static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
 200         unsigned char redmask, greenmask, bluemask;
 201         int redshift, greenshift, blueshift;
 202         int i;
 203         const unsigned char *clut = logo->clut;
 204
 205         /*
 206          * We have to create a temporary palette since console palette is only
 207          * 16 colors long.
 208          */
 209         /* Bug: Doesn't obey msb_right ... (who needs that?) */
 210         redmask   = mask[info->var.red.length   < 8 ? info->var.red.length   : 8];
 211         greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
 212         bluemask  = mask[info->var.blue.length  < 8 ? info->var.blue.length  : 8];
 213         redshift   = info->var.red.offset   - (8 - info->var.red.length);
 214         greenshift = info->var.green.offset - (8 - info->var.green.length);
 215         blueshift  = info->var.blue.offset  - (8 - info->var.blue.length);
 216
 217         for ( i = 0; i < logo->clutsize; i++) {
 218                 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
 219                                  safe_shift((clut[1] & greenmask), greenshift) |
 220                                  safe_shift((clut[2] & bluemask), blueshift));
 221                 clut += 3;
 222         }
 223 }
 224
 225 static void fb_set_logo_directpalette(struct fb_info *info,
 226                                              const struct linux_logo *logo,
 227                                              u32 *palette)
 228 {
 229         int redshift, greenshift, blueshift;
 230         int i;
 231
 232         redshift = info->var.red.offset;
 233         greenshift = info->var.green.offset;
 234         blueshift = info->var.blue.offset;
 235
 236         for (i = 32; i < logo->clutsize; i++)
 237                 palette[i] = i << redshift | i << greenshift | i << blueshift;
 238 }
 239
 240 static void fb_set_logo(struct fb_info *info,
 241                                const struct linux_logo *logo, u8 *dst,
 242                                int depth)
 243 {
 244         int i, j, k;
 245         const u8 *src = logo->data;
 246         u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
 247         u8 fg = 1, d;
 248
 249         switch (fb_get_color_depth(&info->var, &info->fix)) {
 250         case 1:
 251                 fg = 1;
 252                 break;
 253         case 2:
 254                 fg = 3;
 255                 break;
 256         default:
 257                 fg = 7;
 258                 break;
 259         }
 260
 261         if (info->fix.visual == FB_VISUAL_MONO01 ||
 262             info->fix.visual == FB_VISUAL_MONO10)
 263                 fg = ~((u8) (0xfff << info->var.green.length));
 264
 265         switch (depth) {
 266         case 4:
 267                 for (i = 0; i < logo->height; i++)
 268                         for (j = 0; j < logo->width; src++) {
 269                                 *dst++ = *src >> 4;
 270                                 j++;
 271                                 if (j < logo->width) {
 272                                         *dst++ = *src & 0x0f;
 273                                         j++;
 274                                 }
 275                         }
 276                 break;
 277         case 1:
 278                 for (i = 0; i < logo->height; i++) {
 279                         for (j = 0; j < logo->width; src++) {
 280                                 d = *src ^ xor;
 281                                 for (k = 7; k >= 0; k--) {
 282                                         *dst++ = ((d >> k) & 1) ? fg : 0;
 283                                         j++;
 284                                 }
 285                         }
 286                 }
 287                 break;
 288         }
 289 }
 290
 291 /*
 292  * Three (3) kinds of logo maps exist.  linux_logo_clut224 (>16 colors),
 293  * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors).  Depending on
 294  * the visual format and color depth of the framebuffer, the DAC, the
 295  * pseudo_palette, and the logo data will be adjusted accordingly.
 296  *
 297  * Case 1 - linux_logo_clut224:
 298  * Color exceeds the number of console colors (16), thus we set the hardware DAC
 299  * using fb_set_cmap() appropriately.  The "needs_cmapreset"  flag will be set.
 300  *
 301  * For visuals that require color info from the pseudo_palette, we also construct
 302  * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
 303  * will be set.
 304  *
 305  * Case 2 - linux_logo_vga16:
 306  * The number of colors just matches the console colors, thus there is no need
 307  * to set the DAC or the pseudo_palette.  However, the bitmap is packed, ie,
 308  * each byte contains color information for two pixels (upper and lower nibble).
 309  * To be consistent with fb_imageblit() usage, we therefore separate the two
 310  * nibbles into separate bytes. The "depth" flag will be set to 4.
 311  *
 312  * Case 3 - linux_logo_mono:
 313  * This is similar with Case 2.  Each byte contains information for 8 pixels.
 314  * We isolate each bit and expand each into a byte. The "depth" flag will
 315  * be set to 1.
 316  */
 317 static struct logo_data {
 318         int depth;
 319         int needs_directpalette;
 320         int needs_truepalette;
 321         int needs_cmapreset;
 322         const struct linux_logo *logo;
 323 } fb_logo __read_mostly;
 324
 325 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
 326 {
 327         u32 size = width * height, i;
 328
 329         out += size - 1;
 330
 331         for (i = size; i--; )
 332                 *out-- = *in++;
 333 }
 334
 335 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
 336 {
 337         int i, j, h = height - 1;
 338
 339         for (i = 0; i < height; i++)
 340                 for (j = 0; j < width; j++)
 341                                 out[height * j + h - i] = *in++;
 342 }
 343
 344 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
 345 {
 346         int i, j, w = width - 1;
 347
 348         for (i = 0; i < height; i++)
 349                 for (j = 0; j < width; j++)
 350                         out[height * (w - j) + i] = *in++;
 351 }
 352
 353 static void fb_rotate_logo(struct fb_info *info, u8 *dst,
 354                            struct fb_image *image, int rotate)
 355 {
 356         u32 tmp;
 357
 358         if (rotate == FB_ROTATE_UD) {
 359                 fb_rotate_logo_ud(image->data, dst, image->width,
 360                                   image->height);
 361                 image->dx = info->var.xres - image->width - image->dx;
 362                 image->dy = info->var.yres - image->height - image->dy;
 363         } else if (rotate == FB_ROTATE_CW) {
 364                 fb_rotate_logo_cw(image->data, dst, image->width,
 365                                   image->height);
 366                 tmp = image->width;
 367                 image->width = image->height;
 368                 image->height = tmp;
 369                 tmp = image->dy;
 370                 image->dy = image->dx;
 371                 image->dx = info->var.xres - image->width - tmp;
 372         } else if (rotate == FB_ROTATE_CCW) {
 373                 fb_rotate_logo_ccw(image->data, dst, image->width,
 374                                    image->height);
 375                 tmp = image->width;
 376                 image->width = image->height;
 377                 image->height = tmp;
 378                 tmp = image->dx;
 379                 image->dx = image->dy;
 380                 image->dy = info->var.yres - image->height - tmp;
 381         }
 382
 383         image->data = dst;
 384 }
 385
 386 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
 387                             int rotate, unsigned int num)
 388 {
 389         unsigned int x;
 390
 391         if (rotate == FB_ROTATE_UR) {
 392                 for (x = 0;
 393                      x < num && image->dx + image->width <= info->var.xres;
 394                      x++) {
 395                         info->fbops->fb_imageblit(info, image);
 396                         image->dx += image->width + 8;
 397                 }
 398         } else if (rotate == FB_ROTATE_UD) {
 399                 for (x = 0; x < num && image->dx >= 0; x++) {
 400                         info->fbops->fb_imageblit(info, image);
 401                         image->dx -= image->width + 8;
 402                 }
 403         } else if (rotate == FB_ROTATE_CW) {
 404                 for (x = 0;
 405                      x < num && image->dy + image->height <= info->var.yres;
 406                      x++) {
 407                         info->fbops->fb_imageblit(info, image);
 408                         image->dy += image->height + 8;
 409                 }
 410         } else if (rotate == FB_ROTATE_CCW) {
 411                 for (x = 0; x < num && image->dy >= 0; x++) {
 412                         info->fbops->fb_imageblit(info, image);
 413                         image->dy -= image->height + 8;
 414                 }
 415         }
 416 }
 417
 418 static int fb_show_logo_line(struct fb_info *info, int rotate,
 419                              const struct linux_logo *logo, int y,
 420                              unsigned int n)
 421 {
 422         u32 *palette = NULL, *saved_pseudo_palette = NULL;
 423         unsigned char *logo_new = NULL, *logo_rotate = NULL;
 424         struct fb_image image;
 425
 426         /* Return if the frame buffer is not mapped or suspended */
 427         if (logo == NULL || info->state != FBINFO_STATE_RUNNING ||
 428             info->flags & FBINFO_MODULE)
 429                 return 0;
 430
 431         image.depth = 8;
 432         image.data = logo->data;
 433
 434         if (fb_logo.needs_cmapreset)
 435                 fb_set_logocmap(info, logo);
 436
 437         if (fb_logo.needs_truepalette ||
 438             fb_logo.needs_directpalette) {
 439                 palette = kmalloc(256 * 4, GFP_KERNEL);
 440                 if (palette == NULL)
 441                         return 0;
 442
 443                 if (fb_logo.needs_truepalette)
 444                         fb_set_logo_truepalette(info, logo, palette);
 445                 else
 446                         fb_set_logo_directpalette(info, logo, palette);
 447
 448                 saved_pseudo_palette = info->pseudo_palette;
 449                 info->pseudo_palette = palette;
 450         }
 451
 452         if (fb_logo.depth <= 4) {
 453                 logo_new = kmalloc(logo->width * logo->height, GFP_KERNEL);
 454                 if (logo_new == NULL) {
 455                         kfree(palette);
 456                         if (saved_pseudo_palette)
 457                                 info->pseudo_palette = saved_pseudo_palette;
 458                         return 0;
 459                 }
 460                 image.data = logo_new;
 461                 fb_set_logo(info, logo, logo_new, fb_logo.depth);
 462         }
 463
 464         image.dx = 0;
 465         image.dy = y;
 466         image.width = logo->width;
 467         image.height = logo->height;
 468
 469         if (rotate) {
 470                 logo_rotate = kmalloc(logo->width *
 471                                       logo->height, GFP_KERNEL);
 472                 if (logo_rotate)
 473                         fb_rotate_logo(info, logo_rotate, &image, rotate);
 474         }
 475
 476         fb_do_show_logo(info, &image, rotate, n);
 477
 478         kfree(palette);
 479         if (saved_pseudo_palette != NULL)
 480                 info->pseudo_palette = saved_pseudo_palette;
 481         kfree(logo_new);
 482         kfree(logo_rotate);
 483         return logo->height;
 484 }
 485
 486
 487 #ifdef CONFIG_FB_LOGO_EXTRA
 488
 489 #define FB_LOGO_EX_NUM_MAX 10
 490 static struct logo_data_extra {
 491         const struct linux_logo *logo;
 492         unsigned int n;
 493 } fb_logo_ex[FB_LOGO_EX_NUM_MAX];
 494 static unsigned int fb_logo_ex_num;
 495
 496 void fb_append_extra_logo(const struct linux_logo *logo, unsigned int n)
 497 {
 498         if (!n || fb_logo_ex_num == FB_LOGO_EX_NUM_MAX)
 499                 return;
 500
 501         fb_logo_ex[fb_logo_ex_num].logo = logo;
 502         fb_logo_ex[fb_logo_ex_num].n = n;
 503         fb_logo_ex_num++;
 504 }
 505
 506 static int fb_prepare_extra_logos(struct fb_info *info, unsigned int height,
 507                                   unsigned int yres)
 508 {
 509         unsigned int i;
 510
 511         /* FIXME: logo_ex supports only truecolor fb. */
 512         if (info->fix.visual != FB_VISUAL_TRUECOLOR)
 513                 fb_logo_ex_num = 0;
 514
 515         for (i = 0; i < fb_logo_ex_num; i++) {
 516                 height += fb_logo_ex[i].logo->height;
 517                 if (height > yres) {
 518                         height -= fb_logo_ex[i].logo->height;
 519                         fb_logo_ex_num = i;
 520                         break;
 521                 }
 522         }
 523         return height;
 524 }
 525
 526 static int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
 527 {
 528         unsigned int i;
 529
 530         for (i = 0; i < fb_logo_ex_num; i++)
 531                 y += fb_show_logo_line(info, rotate,
 532                                        fb_logo_ex[i].logo, y, fb_logo_ex[i].n);
 533
 534         return y;
 535 }
 536
 537 #else /* !CONFIG_FB_LOGO_EXTRA */
 538
 539 static inline int fb_prepare_extra_logos(struct fb_info *info,
 540                                          unsigned int height,
 541                                          unsigned int yres)
 542 {
 543         return height;
 544 }
 545
 546 static inline int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
 547 {
 548         return y;
 549 }
 550
 551 #endif /* CONFIG_FB_LOGO_EXTRA */
 552
 553
 554 int fb_prepare_logo(struct fb_info *info, int rotate)
 555 {
 556         int depth = fb_get_color_depth(&info->var, &info->fix);
 557         unsigned int yres;
 558
 559         memset(&fb_logo, 0, sizeof(struct logo_data));
 560
 561         if (info->flags & FBINFO_MISC_TILEBLITTING ||
 562             info->flags & FBINFO_MODULE)
 563                 return 0;
 564
 565         if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
 566                 depth = info->var.blue.length;
 567                 if (info->var.red.length < depth)
 568                         depth = info->var.red.length;
 569                 if (info->var.green.length < depth)
 570                         depth = info->var.green.length;
 571         }
 572
 573         if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) {
 574                 /* assume console colormap */
 575                 depth = 4;
 576         }
 577
 578         /* Return if no suitable logo was found */
 579         fb_logo.logo = fb_find_logo(depth);
 580
 581         if (!fb_logo.logo) {
 582                 return 0;
 583         }
 584
 585         if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
 586                 yres = info->var.yres;
 587         else
 588                 yres = info->var.xres;
 589
 590         if (fb_logo.logo->height > yres) {
 591                 fb_logo.logo = NULL;
 592                 return 0;
 593         }
 594
 595         /* What depth we asked for might be different from what we get */
 596         if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
 597                 fb_logo.depth = 8;
 598         else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
 599                 fb_logo.depth = 4;
 600         else
 601                 fb_logo.depth = 1;
 602
 603
 604         if (fb_logo.depth > 4 && depth > 4) {
 605                 switch (info->fix.visual) {
 606                 case FB_VISUAL_TRUECOLOR:
 607                         fb_logo.needs_truepalette = 1;
 608                         break;
 609                 case FB_VISUAL_DIRECTCOLOR:
 610                         fb_logo.needs_directpalette = 1;
 611                         fb_logo.needs_cmapreset = 1;
 612                         break;
 613                 case FB_VISUAL_PSEUDOCOLOR:
 614                         fb_logo.needs_cmapreset = 1;
 615                         break;
 616                 }
 617         }
 618
 619         return fb_prepare_extra_logos(info, fb_logo.logo->height, yres);
 620 }
 621
 622 int fb_show_logo(struct fb_info *info, int rotate)
 623 {
 624         int y;
 625
 626         y = fb_show_logo_line(info, rotate, fb_logo.logo, 0,
 627                               num_online_cpus());
 628         y = fb_show_extra_logos(info, y, rotate);
 629
 630         return y;
 631 }
 632 #else
 633 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
 634 int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
 635 #endif /* CONFIG_LOGO */
 636
 637 static void *fb_seq_start(struct seq_file *m, loff_t *pos)
 638 {
 639         return (*pos < FB_MAX) ? pos : NULL;
 640 }
 641
 642 static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos)
 643 {
 644         (*pos)++;
 645         return (*pos < FB_MAX) ? pos : NULL;
 646 }
 647
 648 static void fb_seq_stop(struct seq_file *m, void *v)
 649 {
 650 }
 651
 652 static int fb_seq_show(struct seq_file *m, void *v)
 653 {
 654         int i = *(loff_t *)v;
 655         struct fb_info *fi = registered_fb[i];
 656
 657         if (fi)
 658                 seq_printf(m, "%d %s\n", fi->node, fi->fix.id);
 659         return 0;
 660 }
 661
 662 static const struct seq_operations proc_fb_seq_ops = {
 663         .start  = fb_seq_start,
 664         .next   = fb_seq_next,
 665         .stop   = fb_seq_stop,
 666         .show   = fb_seq_show,
 667 };
 668
 669 static int proc_fb_open(struct inode *inode, struct file *file)
 670 {
 671         return seq_open(file, &proc_fb_seq_ops);
 672 }
 673
 674 static const struct file_operations fb_proc_fops = {
 675         .owner          = THIS_MODULE,
 676         .open           = proc_fb_open,
 677         .read           = seq_read,
 678         .llseek         = seq_lseek,
 679         .release        = seq_release,
 680 };
 681
 682 static ssize_t
 683 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 684 {
 685         unsigned long p = *ppos;
 686         struct inode *inode = file->f_path.dentry->d_inode;
 687         int fbidx = iminor(inode);
 688         struct fb_info *info = registered_fb[fbidx];
 689         u32 *buffer, *dst;
 690         u32 __iomem *src;
 691         int c, i, cnt = 0, err = 0;
 692         unsigned long total_size;
 693
 694         if (!info || ! info->screen_base)
 695                 return -ENODEV;
 696
 697         if (info->state != FBINFO_STATE_RUNNING)
 698                 return -EPERM;
 699
 700         if (info->fbops->fb_read)
 701                 return info->fbops->fb_read(info, buf, count, ppos);
 702
 703         total_size = info->screen_size;
 704
 705         if (total_size == 0)
 706                 total_size = info->fix.smem_len;
 707
 708         if (p >= total_size)
 709                 return 0;
 710
 711         if (count >= total_size)
 712                 count = total_size;
 713
 714         if (count + p > total_size)
 715                 count = total_size - p;
 716
 717         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 718                          GFP_KERNEL);
 719         if (!buffer)
 720                 return -ENOMEM;
 721
 722         src = (u32 __iomem *) (info->screen_base + p);
 723
 724         if (info->fbops->fb_sync)
 725                 info->fbops->fb_sync(info);
 726
 727         while (count) {
 728                 c  = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 729                 dst = buffer;
 730                 for (i = c >> 2; i--; )
 731                         *dst++ = fb_readl(src++);
 732                 if (c & 3) {
 733                         u8 *dst8 = (u8 *) dst;
 734                         u8 __iomem *src8 = (u8 __iomem *) src;
 735
 736                         for (i = c & 3; i--;)
 737                                 *dst8++ = fb_readb(src8++);
 738
 739                         src = (u32 __iomem *) src8;
 740                 }
 741
 742                 if (copy_to_user(buf, buffer, c)) {
 743                         err = -EFAULT;
 744                         break;
 745                 }
 746                 *ppos += c;
 747                 buf += c;
 748                 cnt += c;
 749                 count -= c;
 750         }
 751
 752         kfree(buffer);
 753
 754         return (err) ? err : cnt;
 755 }
 756
 757 static ssize_t
 758 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 759 {
 760         unsigned long p = *ppos;
 761         struct inode *inode = file->f_path.dentry->d_inode;
 762         int fbidx = iminor(inode);
 763         struct fb_info *info = registered_fb[fbidx];
 764         u32 *buffer, *src;
 765         u32 __iomem *dst;
 766         int c, i, cnt = 0, err = 0;
 767         unsigned long total_size;
 768
 769         if (!info || !info->screen_base)
 770                 return -ENODEV;
 771
 772         if (info->state != FBINFO_STATE_RUNNING)
 773                 return -EPERM;
 774
 775         if (info->fbops->fb_write)
 776                 return info->fbops->fb_write(info, buf, count, ppos);
 777
 778         total_size = info->screen_size;
 779
 780         if (total_size == 0)
 781                 total_size = info->fix.smem_len;
 782
 783         if (p > total_size)
 784                 return -EFBIG;
 785
 786         if (count > total_size) {
 787                 err = -EFBIG;
 788                 count = total_size;
 789         }
 790
 791         if (count + p > total_size) {
 792                 if (!err)
 793                         err = -ENOSPC;
 794
 795                 count = total_size - p;
 796         }
 797
 798         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 799                          GFP_KERNEL);
 800         if (!buffer)
 801                 return -ENOMEM;
 802
 803         dst = (u32 __iomem *) (info->screen_base + p);
 804
 805         if (info->fbops->fb_sync)
 806                 info->fbops->fb_sync(info);
 807
 808         while (count) {
 809                 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 810                 src = buffer;
 811
 812                 if (copy_from_user(src, buf, c)) {
 813                         err = -EFAULT;
 814                         break;
 815                 }
 816
 817                 for (i = c >> 2; i--; )
 818                         fb_writel(*src++, dst++);
 819
 820                 if (c & 3) {
 821                         u8 *src8 = (u8 *) src;
 822                         u8 __iomem *dst8 = (u8 __iomem *) dst;
 823
 824                         for (i = c & 3; i--; )
 825                                 fb_writeb(*src8++, dst8++);
 826
 827                         dst = (u32 __iomem *) dst8;
 828                 }
 829
 830                 *ppos += c;
 831                 buf += c;
 832                 cnt += c;
 833                 count -= c;
 834         }
 835
 836         kfree(buffer);
 837
 838         return (cnt) ? cnt : err;
 839 }
 840
 841 #ifdef CONFIG_KMOD
 842 static void try_to_load(int fb)
 843 {
 844         request_module("fb%d", fb);
 845 }
 846 #endif /* CONFIG_KMOD */
 847
 848 int
 849 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
 850 {
 851         struct fb_fix_screeninfo *fix = &info->fix;
 852         unsigned int yres = info->var.yres;
 853         int err = 0;
 854
 855         if (var->yoffset > 0) {
 856                 if (var->vmode & FB_VMODE_YWRAP) {
 857                         if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
 858                                 err = -EINVAL;
 859                         else
 860                                 yres = 0;
 861                 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
 862                         err = -EINVAL;
 863         }
 864
 865         if (var->xoffset > 0 && (!fix->xpanstep ||
 866                                  (var->xoffset % fix->xpanstep)))
 867                 err = -EINVAL;
 868
 869         if (err || !info->fbops->fb_pan_display ||
 870             var->yoffset + yres > info->var.yres_virtual ||
 871             var->xoffset + info->var.xres > info->var.xres_virtual)
 872                 return -EINVAL;
 873
 874         if ((err = info->fbops->fb_pan_display(var, info)))
 875                 return err;
 876         info->var.xoffset = var->xoffset;
 877         info->var.yoffset = var->yoffset;
 878         if (var->vmode & FB_VMODE_YWRAP)
 879                 info->var.vmode |= FB_VMODE_YWRAP;
 880         else
 881                 info->var.vmode &= ~FB_VMODE_YWRAP;
 882         return 0;
 883 }
 884
 885 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var,
 886                          u32 activate)
 887 {
 888         struct fb_event event;
 889         struct fb_blit_caps caps, fbcaps;
 890         int err = 0;
 891
 892         memset(&caps, 0, sizeof(caps));
 893         memset(&fbcaps, 0, sizeof(fbcaps));
 894         caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0;
 895         event.info = info;
 896         event.data = &caps;
 897         fb_notifier_call_chain(FB_EVENT_GET_REQ, &event);
 898         info->fbops->fb_get_caps(info, &fbcaps, var);
 899
 900         if (((fbcaps.x ^ caps.x) & caps.x) ||
 901             ((fbcaps.y ^ caps.y) & caps.y) ||
 902             (fbcaps.len < caps.len))
 903                 err = -EINVAL;
 904
 905         return err;
 906 }
 907
 908 int
 909 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
 910 {
 911         int flags = info->flags;
 912         int ret = 0;
 913
 914         if (var->activate & FB_ACTIVATE_INV_MODE) {
 915                 struct fb_videomode mode1, mode2;
 916
 917                 fb_var_to_videomode(&mode1, var);
 918                 fb_var_to_videomode(&mode2, &info->var);
 919                 /* make sure we don't delete the videomode of current var */
 920                 ret = fb_mode_is_equal(&mode1, &mode2);
 921
 922                 if (!ret) {
 923                     struct fb_event event;
 924
 925                     event.info = info;
 926                     event.data = &mode1;
 927                     ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event);
 928                 }
 929
 930                 if (!ret)
 931                     fb_delete_videomode(&mode1, &info->modelist);
 932
 933
 934                 ret = (ret) ? -EINVAL : 0;
 935                 goto done;
 936         }
 937
 938         if ((var->activate & FB_ACTIVATE_FORCE) ||
 939             memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
 940                 u32 activate = var->activate;
 941
 942                 if (!info->fbops->fb_check_var) {
 943                         *var = info->var;
 944                         goto done;
 945                 }
 946
 947                 ret = info->fbops->fb_check_var(var, info);
 948
 949                 if (ret)
 950                         goto done;
 951
 952                 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
 953                         struct fb_videomode mode;
 954
 955                         if (info->fbops->fb_get_caps) {
 956                                 ret = fb_check_caps(info, var, activate);
 957
 958                                 if (ret)
 959                                         goto done;
 960                         }
 961
 962                         info->var = *var;
 963
 964                         if (info->fbops->fb_set_par)
 965                                 info->fbops->fb_set_par(info);
 966
 967                         fb_pan_display(info, &info->var);
 968                         fb_set_cmap(&info->cmap, info);
 969                         fb_var_to_videomode(&mode, &info->var);
 970
 971                         if (info->modelist.prev && info->modelist.next &&
 972                             !list_empty(&info->modelist))
 973                                 ret = fb_add_videomode(&mode, &info->modelist);
 974
 975                         if (!ret && (flags & FBINFO_MISC_USEREVENT)) {
 976                                 struct fb_event event;
 977                                 int evnt = (activate & FB_ACTIVATE_ALL) ?
 978                                         FB_EVENT_MODE_CHANGE_ALL :
 979                                         FB_EVENT_MODE_CHANGE;
 980
 981                                 info->flags &= ~FBINFO_MISC_USEREVENT;
 982                                 event.info = info;
 983                                 fb_notifier_call_chain(evnt, &event);
 984                         }
 985                 }
 986         }
 987
 988  done:
 989         return ret;
 990 }
 991
 992 int
 993 fb_blank(struct fb_info *info, int blank)
 994 {
 995         int ret = -EINVAL;
 996
 997         if (blank > FB_BLANK_POWERDOWN)
 998                 blank = FB_BLANK_POWERDOWN;
 999
1000         if (info->fbops->fb_blank)
1001                 ret = info->fbops->fb_blank(blank, info);
1002
1003         if (!ret) {
1004                 struct fb_event event;
1005
1006                 event.info = info;
1007                 event.data = &blank;
1008                 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
1009         }
1010
1011         return ret;
1012 }
1013
1014 static int
1015 fb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
1016          unsigned long arg)
1017 {
1018         int fbidx = iminor(inode);
1019         struct fb_info *info = registered_fb[fbidx];
1020         struct fb_ops *fb = info->fbops;
1021         struct fb_var_screeninfo var;
1022         struct fb_fix_screeninfo fix;
1023         struct fb_con2fbmap con2fb;
1024         struct fb_cmap_user cmap;
1025         struct fb_event event;
1026         void __user *argp = (void __user *)arg;
1027         int i;
1028
1029         if (!fb)
1030                 return -ENODEV;
1031         switch (cmd) {
1032         case FBIOGET_VSCREENINFO:
1033                 return copy_to_user(argp, &info->var,
1034                                     sizeof(var)) ? -EFAULT : 0;
1035         case FBIOPUT_VSCREENINFO:
1036                 if (copy_from_user(&var, argp, sizeof(var)))
1037                         return -EFAULT;
1038                 acquire_console_sem();
1039                 info->flags |= FBINFO_MISC_USEREVENT;
1040                 i = fb_set_var(info, &var);
1041                 info->flags &= ~FBINFO_MISC_USEREVENT;
1042                 release_console_sem();
1043                 if (i) return i;
1044                 if (copy_to_user(argp, &var, sizeof(var)))
1045                         return -EFAULT;
1046                 return 0;
1047         case FBIOGET_FSCREENINFO:
1048                 return copy_to_user(argp, &info->fix,
1049                                     sizeof(fix)) ? -EFAULT : 0;
1050         case FBIOPUTCMAP:
1051                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1052                         return -EFAULT;
1053                 return (fb_set_user_cmap(&cmap, info));
1054         case FBIOGETCMAP:
1055                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1056                         return -EFAULT;
1057                 return fb_cmap_to_user(&info->cmap, &cmap);
1058         case FBIOPAN_DISPLAY:
1059                 if (copy_from_user(&var, argp, sizeof(var)))
1060                         return -EFAULT;
1061                 acquire_console_sem();
1062                 i = fb_pan_display(info, &var);
1063                 release_console_sem();
1064                 if (i)
1065                         return i;
1066                 if (copy_to_user(argp, &var, sizeof(var)))
1067                         return -EFAULT;
1068                 return 0;
1069         case FBIO_CURSOR:
1070                 return -EINVAL;
1071         case FBIOGET_CON2FBMAP:
1072                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1073                         return -EFAULT;
1074                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1075                     return -EINVAL;
1076                 con2fb.framebuffer = -1;
1077                 event.info = info;
1078                 event.data = &con2fb;
1079                 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
1080                 return copy_to_user(argp, &con2fb,
1081                                     sizeof(con2fb)) ? -EFAULT : 0;
1082         case FBIOPUT_CON2FBMAP:
1083                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1084                         return - EFAULT;
1085                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1086                     return -EINVAL;
1087                 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
1088                     return -EINVAL;
1089 #ifdef CONFIG_KMOD
1090                 if (!registered_fb[con2fb.framebuffer])
1091                     try_to_load(con2fb.framebuffer);
1092 #endif /* CONFIG_KMOD */
1093                 if (!registered_fb[con2fb.framebuffer])
1094                     return -EINVAL;
1095                 event.info = info;
1096                 event.data = &con2fb;
1097                 return fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP,
1098                                               &event);
1099         case FBIOBLANK:
1100                 acquire_console_sem();
1101                 info->flags |= FBINFO_MISC_USEREVENT;
1102                 i = fb_blank(info, arg);
1103                 info->flags &= ~FBINFO_MISC_USEREVENT;
1104                 release_console_sem();
1105                 return i;
1106         default:
1107                 if (fb->fb_ioctl == NULL)
1108                         return -EINVAL;
1109                 return fb->fb_ioctl(info, cmd, arg);
1110         }
1111 }
1112
1113 #ifdef CONFIG_COMPAT
1114 struct fb_fix_screeninfo32 {
1115         char                    id[16];
1116         compat_caddr_t          smem_start;
1117         u32                     smem_len;
1118         u32                     type;
1119         u32                     type_aux;
1120         u32                     visual;
1121         u16                     xpanstep;
1122         u16                     ypanstep;
1123         u16                     ywrapstep;
1124         u32                     line_length;
1125         compat_caddr_t          mmio_start;
1126         u32                     mmio_len;
1127         u32                     accel;
1128         u16                     reserved[3];
1129 };
1130
1131 struct fb_cmap32 {
1132         u32                     start;
1133         u32                     len;
1134         compat_caddr_t  red;
1135         compat_caddr_t  green;
1136         compat_caddr_t  blue;
1137         compat_caddr_t  transp;
1138 };
1139
1140 static int fb_getput_cmap(struct inode *inode, struct file *file,
1141                         unsigned int cmd, unsigned long arg)
1142 {
1143         struct fb_cmap_user __user *cmap;
1144         struct fb_cmap32 __user *cmap32;
1145         __u32 data;
1146         int err;
1147
1148         cmap = compat_alloc_user_space(sizeof(*cmap));
1149         cmap32 = compat_ptr(arg);
1150
1151         if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1152                 return -EFAULT;
1153
1154         if (get_user(data, &cmap32->red) ||
1155             put_user(compat_ptr(data), &cmap->red) ||
1156             get_user(data, &cmap32->green) ||
1157             put_user(compat_ptr(data), &cmap->green) ||
1158             get_user(data, &cmap32->blue) ||
1159             put_user(compat_ptr(data), &cmap->blue) ||
1160             get_user(data, &cmap32->transp) ||
1161             put_user(compat_ptr(data), &cmap->transp))
1162                 return -EFAULT;
1163
1164         err = fb_ioctl(inode, file, cmd, (unsigned long) cmap);
1165
1166         if (!err) {
1167                 if (copy_in_user(&cmap32->start,
1168                                  &cmap->start,
1169                                  2 * sizeof(__u32)))
1170                         err = -EFAULT;
1171         }
1172         return err;
1173 }
1174
1175 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1176                                   struct fb_fix_screeninfo32 __user *fix32)
1177 {
1178         __u32 data;
1179         int err;
1180
1181         err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1182
1183         data = (__u32) (unsigned long) fix->smem_start;
1184         err |= put_user(data, &fix32->smem_start);
1185
1186         err |= put_user(fix->smem_len, &fix32->smem_len);
1187         err |= put_user(fix->type, &fix32->type);
1188         err |= put_user(fix->type_aux, &fix32->type_aux);
1189         err |= put_user(fix->visual, &fix32->visual);
1190         err |= put_user(fix->xpanstep, &fix32->xpanstep);
1191         err |= put_user(fix->ypanstep, &fix32->ypanstep);
1192         err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1193         err |= put_user(fix->line_length, &fix32->line_length);
1194
1195         data = (__u32) (unsigned long) fix->mmio_start;
1196         err |= put_user(data, &fix32->mmio_start);
1197
1198         err |= put_user(fix->mmio_len, &fix32->mmio_len);
1199         err |= put_user(fix->accel, &fix32->accel);
1200         err |= copy_to_user(fix32->reserved, fix->reserved,
1201                             sizeof(fix->reserved));
1202
1203         return err;
1204 }
1205
1206 static int fb_get_fscreeninfo(struct inode *inode, struct file *file,
1207                                 unsigned int cmd, unsigned long arg)
1208 {
1209         mm_segment_t old_fs;
1210         struct fb_fix_screeninfo fix;
1211         struct fb_fix_screeninfo32 __user *fix32;
1212         int err;
1213
1214         fix32 = compat_ptr(arg);
1215
1216         old_fs = get_fs();
1217         set_fs(KERNEL_DS);
1218         err = fb_ioctl(inode, file, cmd, (unsigned long) &fix);
1219         set_fs(old_fs);
1220
1221         if (!err)
1222                 err = do_fscreeninfo_to_user(&fix, fix32);
1223
1224         return err;
1225 }
1226
1227 static long
1228 fb_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1229 {
1230         struct inode *inode = file->f_path.dentry->d_inode;
1231         int fbidx = iminor(inode);
1232         struct fb_info *info = registered_fb[fbidx];
1233         struct fb_ops *fb = info->fbops;
1234         long ret = -ENOIOCTLCMD;
1235
1236         lock_kernel();
1237         switch(cmd) {
1238         case FBIOGET_VSCREENINFO:
1239         case FBIOPUT_VSCREENINFO:
1240         case FBIOPAN_DISPLAY:
1241         case FBIOGET_CON2FBMAP:
1242         case FBIOPUT_CON2FBMAP:
1243                 arg = (unsigned long) compat_ptr(arg);
1244         case FBIOBLANK:
1245                 ret = fb_ioctl(inode, file, cmd, arg);
1246                 break;
1247
1248         case FBIOGET_FSCREENINFO:
1249                 ret = fb_get_fscreeninfo(inode, file, cmd, arg);
1250                 break;
1251
1252         case FBIOGETCMAP:
1253         case FBIOPUTCMAP:
1254                 ret = fb_getput_cmap(inode, file, cmd, arg);
1255                 break;
1256
1257         default:
1258                 if (fb->fb_compat_ioctl)
1259                         ret = fb->fb_compat_ioctl(info, cmd, arg);
1260                 break;
1261         }
1262         unlock_kernel();
1263         return ret;
1264 }
1265 #endif
1266
1267 static int
1268 fb_mmap(struct file *file, struct vm_area_struct * vma)
1269 {
1270         int fbidx = iminor(file->f_path.dentry->d_inode);
1271         struct fb_info *info = registered_fb[fbidx];
1272         struct fb_ops *fb = info->fbops;
1273         unsigned long off;
1274         unsigned long start;
1275         u32 len;
1276
1277         if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
1278                 return -EINVAL;
1279         off = vma->vm_pgoff << PAGE_SHIFT;
1280         if (!fb)
1281                 return -ENODEV;
1282         if (fb->fb_mmap) {
1283                 int res;
1284                 lock_kernel();
1285                 res = fb->fb_mmap(info, vma);
1286                 unlock_kernel();
1287                 return res;
1288         }
1289
1290         lock_kernel();
1291
1292         /* frame buffer memory */
1293         start = info->fix.smem_start;
1294         len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
1295         if (off >= len) {
1296                 /* memory mapped io */
1297                 off -= len;
1298                 if (info->var.accel_flags) {
1299                         unlock_kernel();
1300                         return -EINVAL;
1301                 }
1302                 start = info->fix.mmio_start;
1303                 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
1304         }
1305         unlock_kernel();
1306         start &= PAGE_MASK;
1307         if ((vma->vm_end - vma->vm_start + off) > len)
1308                 return -EINVAL;
1309         off += start;
1310         vma->vm_pgoff = off >> PAGE_SHIFT;
1311         /* This is an IO map - tell maydump to skip this VMA */
1312         vma->vm_flags |= VM_IO | VM_RESERVED;
1313         fb_pgprotect(file, vma, off);
1314         if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1315                              vma->vm_end - vma->vm_start, vma->vm_page_prot))
1316                 return -EAGAIN;
1317         return 0;
1318 }
1319
1320 static int
1321 fb_open(struct inode *inode, struct file *file)
1322 {
1323         int fbidx = iminor(inode);
1324         struct fb_info *info;
1325         int res = 0;
1326
1327         if (fbidx >= FB_MAX)
1328                 return -ENODEV;
1329         lock_kernel();
1330 #ifdef CONFIG_KMOD
1331         if (!(info = registered_fb[fbidx]))
1332                 try_to_load(fbidx);
1333 #endif /* CONFIG_KMOD */
1334         if (!(info = registered_fb[fbidx])) {
1335                 res = -ENODEV;
1336                 goto out;
1337         }
1338         if (!try_module_get(info->fbops->owner)) {
1339                 res = -ENODEV;
1340                 goto out;
1341         }
1342         file->private_data = info;
1343         if (info->fbops->fb_open) {
1344                 res = info->fbops->fb_open(info,1);
1345                 if (res)
1346                         module_put(info->fbops->owner);
1347         }
1348 out:
1349         unlock_kernel();
1350         return res;
1351 }
1352
1353 static int
1354 fb_release(struct inode *inode, struct file *file)
1355 {
1356         struct fb_info * const info = file->private_data;
1357
1358         lock_kernel();
1359         if (info->fbops->fb_release)
1360                 info->fbops->fb_release(info,1);
1361         module_put(info->fbops->owner);
1362         unlock_kernel();
1363         return 0;
1364 }
1365
1366 static const struct file_operations fb_fops = {
1367         .owner =        THIS_MODULE,
1368         .read =         fb_read,
1369         .write =        fb_write,
1370         .ioctl =        fb_ioctl,
1371 #ifdef CONFIG_COMPAT
1372         .compat_ioctl = fb_compat_ioctl,
1373 #endif
1374         .mmap =         fb_mmap,
1375         .open =         fb_open,
1376         .release =      fb_release,
1377 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1378         .get_unmapped_area = get_fb_unmapped_area,
1379 #endif
1380 #ifdef CONFIG_FB_DEFERRED_IO
1381         .fsync =        fb_deferred_io_fsync,
1382 #endif
1383 };
1384
1385 struct class *fb_class;
1386 EXPORT_SYMBOL(fb_class);
1387
1388 static int fb_check_foreignness(struct fb_info *fi)
1389 {
1390         const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN;
1391
1392         fi->flags &= ~FBINFO_FOREIGN_ENDIAN;
1393
1394 #ifdef __BIG_ENDIAN
1395         fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH;
1396 #else
1397         fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0;
1398 #endif /* __BIG_ENDIAN */
1399
1400         if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) {
1401                 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to "
1402                        "support this framebuffer\n", fi->fix.id);
1403                 return -ENOSYS;
1404         } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) {
1405                 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to "
1406                        "support this framebuffer\n", fi->fix.id);
1407                 return -ENOSYS;
1408         }
1409
1410         return 0;
1411 }
1412
1413 /**
1414  *      register_framebuffer - registers a frame buffer device
1415  *      @fb_info: frame buffer info structure
1416  *
1417  *      Registers a frame buffer device @fb_info.
1418  *
1419  *      Returns negative errno on error, or zero for success.
1420  *
1421  */
1422
1423 int
1424 register_framebuffer(struct fb_info *fb_info)
1425 {
1426         int i;
1427         struct fb_event event;
1428         struct fb_videomode mode;
1429
1430         if (num_registered_fb == FB_MAX)
1431                 return -ENXIO;
1432
1433         if (fb_check_foreignness(fb_info))
1434                 return -ENOSYS;
1435
1436         num_registered_fb++;
1437         for (i = 0 ; i < FB_MAX; i++)
1438                 if (!registered_fb[i])
1439                         break;
1440         fb_info->node = i;
1441
1442         fb_info->dev = device_create_drvdata(fb_class, fb_info->device,
1443                                              MKDEV(FB_MAJOR, i), NULL,
1444                                              "fb%d", i);
1445         if (IS_ERR(fb_info->dev)) {
1446                 /* Not fatal */
1447                 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1448                 fb_info->dev = NULL;
1449         } else
1450                 fb_init_device(fb_info);
1451
1452         if (fb_info->pixmap.addr == NULL) {
1453                 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1454                 if (fb_info->pixmap.addr) {
1455                         fb_info->pixmap.size = FBPIXMAPSIZE;
1456                         fb_info->pixmap.buf_align = 1;
1457                         fb_info->pixmap.scan_align = 1;
1458                         fb_info->pixmap.access_align = 32;
1459                         fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1460                 }
1461         }
1462         fb_info->pixmap.offset = 0;
1463
1464         if (!fb_info->pixmap.blit_x)
1465                 fb_info->pixmap.blit_x = ~(u32)0;
1466
1467         if (!fb_info->pixmap.blit_y)
1468                 fb_info->pixmap.blit_y = ~(u32)0;
1469
1470         if (!fb_info->modelist.prev || !fb_info->modelist.next)
1471                 INIT_LIST_HEAD(&fb_info->modelist);
1472
1473         fb_var_to_videomode(&mode, &fb_info->var);
1474         fb_add_videomode(&mode, &fb_info->modelist);
1475         registered_fb[i] = fb_info;
1476
1477         event.info = fb_info;
1478         fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1479         return 0;
1480 }
1481
1482
1483 /**
1484  *      unregister_framebuffer - releases a frame buffer device
1485  *      @fb_info: frame buffer info structure
1486  *
1487  *      Unregisters a frame buffer device @fb_info.
1488  *
1489  *      Returns negative errno on error, or zero for success.
1490  *
1491  *      This function will also notify the framebuffer console
1492  *      to release the driver.
1493  *
1494  *      This is meant to be called within a driver's module_exit()
1495  *      function. If this is called outside module_exit(), ensure
1496  *      that the driver implements fb_open() and fb_release() to
1497  *      check that no processes are using the device.
1498  */
1499
1500 int
1501 unregister_framebuffer(struct fb_info *fb_info)
1502 {
1503         struct fb_event event;
1504         int i, ret = 0;
1505
1506         i = fb_info->node;
1507         if (!registered_fb[i]) {
1508                 ret = -EINVAL;
1509                 goto done;
1510         }
1511
1512         event.info = fb_info;
1513         ret = fb_notifier_call_chain(FB_EVENT_FB_UNBIND, &event);
1514
1515         if (ret) {
1516                 ret = -EINVAL;
1517                 goto done;
1518         }
1519
1520         if (fb_info->pixmap.addr &&
1521             (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1522                 kfree(fb_info->pixmap.addr);
1523         fb_destroy_modelist(&fb_info->modelist);
1524         registered_fb[i]=NULL;
1525         num_registered_fb--;
1526         fb_cleanup_device(fb_info);
1527         device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1528         event.info = fb_info;
1529         fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1530 done:
1531         return ret;
1532 }
1533
1534 /**
1535  *      fb_set_suspend - low level driver signals suspend
1536  *      @info: framebuffer affected
1537  *      @state: 0 = resuming, !=0 = suspending
1538  *
1539  *      This is meant to be used by low level drivers to
1540  *      signal suspend/resume to the core & clients.
1541  *      It must be called with the console semaphore held
1542  */
1543 void fb_set_suspend(struct fb_info *info, int state)
1544 {
1545         struct fb_event event;
1546
1547         event.info = info;
1548         if (state) {
1549                 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event);
1550                 info->state = FBINFO_STATE_SUSPENDED;
1551         } else {
1552                 info->state = FBINFO_STATE_RUNNING;
1553                 fb_notifier_call_chain(FB_EVENT_RESUME, &event);
1554         }
1555 }
1556
1557 /**
1558  *      fbmem_init - init frame buffer subsystem
1559  *
1560  *      Initialize the frame buffer subsystem.
1561  *
1562  *      NOTE: This function is _only_ to be called by drivers/char/mem.c.
1563  *
1564  */
1565
1566 static int __init
1567 fbmem_init(void)
1568 {
1569         proc_create("fb", 0, NULL, &fb_proc_fops);
1570
1571         if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1572                 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1573
1574         fb_class = class_create(THIS_MODULE, "graphics");
1575         if (IS_ERR(fb_class)) {
1576                 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1577                 fb_class = NULL;
1578         }
1579         return 0;
1580 }
1581
1582 #ifdef MODULE
1583 module_init(fbmem_init);
1584 static void __exit
1585 fbmem_exit(void)
1586 {
1587         remove_proc_entry("fb", NULL);
1588         class_destroy(fb_class);
1589         unregister_chrdev(FB_MAJOR, "fb");
1590 }
1591
1592 module_exit(fbmem_exit);
1593 MODULE_LICENSE("GPL");
1594 MODULE_DESCRIPTION("Framebuffer base");
1595 #else
1596 subsys_initcall(fbmem_init);
1597 #endif
1598
1599 int fb_new_modelist(struct fb_info *info)
1600 {
1601         struct fb_event event;
1602         struct fb_var_screeninfo var = info->var;
1603         struct list_head *pos, *n;
1604         struct fb_modelist *modelist;
1605         struct fb_videomode *m, mode;
1606         int err = 1;
1607
1608         list_for_each_safe(pos, n, &info->modelist) {
1609                 modelist = list_entry(pos, struct fb_modelist, list);
1610                 m = &modelist->mode;
1611                 fb_videomode_to_var(&var, m);
1612                 var.activate = FB_ACTIVATE_TEST;
1613                 err = fb_set_var(info, &var);
1614                 fb_var_to_videomode(&mode, &var);
1615                 if (err || !fb_mode_is_equal(m, &mode)) {
1616                         list_del(pos);
1617                         kfree(pos);
1618                 }
1619         }
1620
1621         err = 1;
1622
1623         if (!list_empty(&info->modelist)) {
1624                 event.info = info;
1625                 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
1626         }
1627
1628         return err;
1629 }
1630
1631 static char *video_options[FB_MAX] __read_mostly;
1632 static int ofonly __read_mostly;
1633
1634 /**
1635  * fb_get_options - get kernel boot parameters
1636  * @name:   framebuffer name as it would appear in
1637  *          the boot parameter line
1638  *          (video=<name>:<options>)
1639  * @option: the option will be stored here
1640  *
1641  * NOTE: Needed to maintain backwards compatibility
1642  */
1643 int fb_get_options(char *name, char **option)
1644 {
1645         char *opt, *options = NULL;
1646         int opt_len, retval = 0;
1647         int name_len = strlen(name), i;
1648
1649         if (name_len && ofonly && strncmp(name, "offb", 4))
1650                 retval = 1;
1651
1652         if (name_len && !retval) {
1653                 for (i = 0; i < FB_MAX; i++) {
1654                         if (video_options[i] == NULL)
1655                                 continue;
1656                         opt_len = strlen(video_options[i]);
1657                         if (!opt_len)
1658                                 continue;
1659                         opt = video_options[i];
1660                         if (!strncmp(name, opt, name_len) &&
1661                             opt[name_len] == ':')
1662                                 options = opt + name_len + 1;
1663                 }
1664         }
1665         if (options && !strncmp(options, "off", 3))
1666                 retval = 1;
1667
1668         if (option)
1669                 *option = options;
1670
1671         return retval;
1672 }
1673
1674 #ifndef MODULE
1675 /**
1676  *      video_setup - process command line options
1677  *      @options: string of options
1678  *
1679  *      Process command line options for frame buffer subsystem.
1680  *
1681  *      NOTE: This function is a __setup and __init function.
1682  *            It only stores the options.  Drivers have to call
1683  *            fb_get_options() as necessary.
1684  *
1685  *      Returns zero.
1686  *
1687  */
1688 static int __init video_setup(char *options)
1689 {
1690         int i, global = 0;
1691
1692         if (!options || !*options)
1693                 global = 1;
1694
1695         if (!global && !strncmp(options, "ofonly", 6)) {
1696                 ofonly = 1;
1697                 global = 1;
1698         }
1699
1700         if (!global && !strstr(options, "fb:")) {
1701                 fb_mode_option = options;
1702                 global = 1;
1703         }
1704
1705         if (!global) {
1706                 for (i = 0; i < FB_MAX; i++) {
1707                         if (video_options[i] == NULL) {
1708                                 video_options[i] = options;
1709                                 break;
1710                         }
1711
1712                 }
1713         }
1714
1715         return 1;
1716 }
1717 __setup("video=", video_setup);
1718 #endif
1719
1720     /*
1721      *  Visible symbols for modules
1722      */
1723
1724 EXPORT_SYMBOL(register_framebuffer);
1725 EXPORT_SYMBOL(unregister_framebuffer);
1726 EXPORT_SYMBOL(num_registered_fb);
1727 EXPORT_SYMBOL(registered_fb);
1728 EXPORT_SYMBOL(fb_show_logo);
1729 EXPORT_SYMBOL(fb_set_var);
1730 EXPORT_SYMBOL(fb_blank);
1731 EXPORT_SYMBOL(fb_pan_display);
1732 EXPORT_SYMBOL(fb_get_buffer_offset);
1733 EXPORT_SYMBOL(fb_set_suspend);
1734 EXPORT_SYMBOL(fb_get_options);
1735
1736 MODULE_LICENSE("GPL");