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/kernel.h>
  20 #include <linux/major.h>
  21 #include <linux/slab.h>
  22 #include <linux/mm.h>
  23 #include <linux/mman.h>
  24 #include <linux/vt.h>
  25 #include <linux/init.h>
  26 #include <linux/linux_logo.h>
  27 #include <linux/proc_fs.h>
  28 #include <linux/seq_file.h>
  29 #include <linux/console.h>
  30 #include <linux/kmod.h>
  31 #include <linux/err.h>
  32 #include <linux/device.h>
  33 #include <linux/efi.h>
  34 #include <linux/fb.h>
  35
  36 #include <asm/fb.h>
  37
  38
  39     /*
  40      *  Frame buffer device initialization and setup routines
  41      */
  42
  43 #define FBPIXMAPSIZE    (1024 * 8)
  44
  45 static DEFINE_MUTEX(registration_lock);
  46 struct fb_info *registered_fb[FB_MAX] __read_mostly;
  47 int num_registered_fb __read_mostly;
  48
  49 static struct fb_info *get_fb_info(unsigned int idx)
  50 {
  51         struct fb_info *fb_info;
  52
  53         if (idx >= FB_MAX)
  54                 return ERR_PTR(-ENODEV);
  55
  56         mutex_lock(&registration_lock);
  57         fb_info = registered_fb[idx];
  58         if (fb_info)
  59                 atomic_inc(&fb_info->count);
  60         mutex_unlock(&registration_lock);
  61
  62         return fb_info;
  63 }
  64
  65 static void put_fb_info(struct fb_info *fb_info)
  66 {
  67         if (!atomic_dec_and_test(&fb_info->count))
  68                 return;
  69         if (fb_info->fbops->fb_destroy)
  70                 fb_info->fbops->fb_destroy(fb_info);
  71 }
  72
  73 int lock_fb_info(struct fb_info *info)
  74 {
  75         mutex_lock(&info->lock);
  76         if (!info->fbops) {
  77                 mutex_unlock(&info->lock);
  78                 return 0;
  79         }
  80         return 1;
  81 }
  82 EXPORT_SYMBOL(lock_fb_info);
  83
  84 /*
  85  * Helpers
  86  */
  87
  88 int fb_get_color_depth(struct fb_var_screeninfo *var,
  89                        struct fb_fix_screeninfo *fix)
  90 {
  91         int depth = 0;
  92
  93         if (fix->visual == FB_VISUAL_MONO01 ||
  94             fix->visual == FB_VISUAL_MONO10)
  95                 depth = 1;
  96         else {
  97                 if (var->green.length == var->blue.length &&
  98                     var->green.length == var->red.length &&
  99                     var->green.offset == var->blue.offset &&
 100                     var->green.offset == var->red.offset)
 101                         depth = var->green.length;
 102                 else
 103                         depth = var->green.length + var->red.length +
 104                                 var->blue.length;
 105         }
 106
 107         return depth;
 108 }
 109 EXPORT_SYMBOL(fb_get_color_depth);
 110
 111 /*
 112  * Data padding functions.
 113  */
 114 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
 115 {
 116         __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
 117 }
 118 EXPORT_SYMBOL(fb_pad_aligned_buffer);
 119
 120 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
 121                                 u32 shift_high, u32 shift_low, u32 mod)
 122 {
 123         u8 mask = (u8) (0xfff << shift_high), tmp;
 124         int i, j;
 125
 126         for (i = height; i--; ) {
 127                 for (j = 0; j < idx; j++) {
 128                         tmp = dst[j];
 129                         tmp &= mask;
 130                         tmp |= *src >> shift_low;
 131                         dst[j] = tmp;
 132                         tmp = *src << shift_high;
 133                         dst[j+1] = tmp;
 134                         src++;
 135                 }
 136                 tmp = dst[idx];
 137                 tmp &= mask;
 138                 tmp |= *src >> shift_low;
 139                 dst[idx] = tmp;
 140                 if (shift_high < mod) {
 141                         tmp = *src << shift_high;
 142                         dst[idx+1] = tmp;
 143                 }
 144                 src++;
 145                 dst += d_pitch;
 146         }
 147 }
 148 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
 149
 150 /*
 151  * we need to lock this section since fb_cursor
 152  * may use fb_imageblit()
 153  */
 154 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
 155 {
 156         u32 align = buf->buf_align - 1, offset;
 157         char *addr = buf->addr;
 158
 159         /* If IO mapped, we need to sync before access, no sharing of
 160          * the pixmap is done
 161          */
 162         if (buf->flags & FB_PIXMAP_IO) {
 163                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 164                         info->fbops->fb_sync(info);
 165                 return addr;
 166         }
 167
 168         /* See if we fit in the remaining pixmap space */
 169         offset = buf->offset + align;
 170         offset &= ~align;
 171         if (offset + size > buf->size) {
 172                 /* We do not fit. In order to be able to re-use the buffer,
 173                  * we must ensure no asynchronous DMA'ing or whatever operation
 174                  * is in progress, we sync for that.
 175                  */
 176                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 177                         info->fbops->fb_sync(info);
 178                 offset = 0;
 179         }
 180         buf->offset = offset + size;
 181         addr += offset;
 182
 183         return addr;
 184 }
 185
 186 #ifdef CONFIG_LOGO
 187
 188 static inline unsigned safe_shift(unsigned d, int n)
 189 {
 190         return n < 0 ? d >> -n : d << n;
 191 }
 192
 193 static void fb_set_logocmap(struct fb_info *info,
 194                                    const struct linux_logo *logo)
 195 {
 196         struct fb_cmap palette_cmap;
 197         u16 palette_green[16];
 198         u16 palette_blue[16];
 199         u16 palette_red[16];
 200         int i, j, n;
 201         const unsigned char *clut = logo->clut;
 202
 203         palette_cmap.start = 0;
 204         palette_cmap.len = 16;
 205         palette_cmap.red = palette_red;
 206         palette_cmap.green = palette_green;
 207         palette_cmap.blue = palette_blue;
 208         palette_cmap.transp = NULL;
 209
 210         for (i = 0; i < logo->clutsize; i += n) {
 211                 n = logo->clutsize - i;
 212                 /* palette_cmap provides space for only 16 colors at once */
 213                 if (n > 16)
 214                         n = 16;
 215                 palette_cmap.start = 32 + i;
 216                 palette_cmap.len = n;
 217                 for (j = 0; j < n; ++j) {
 218                         palette_cmap.red[j] = clut[0] << 8 | clut[0];
 219                         palette_cmap.green[j] = clut[1] << 8 | clut[1];
 220                         palette_cmap.blue[j] = clut[2] << 8 | clut[2];
 221                         clut += 3;
 222                 }
 223                 fb_set_cmap(&palette_cmap, info);
 224         }
 225 }
 226
 227 static void  fb_set_logo_truepalette(struct fb_info *info,
 228                                             const struct linux_logo *logo,
 229                                             u32 *palette)
 230 {
 231         static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
 232         unsigned char redmask, greenmask, bluemask;
 233         int redshift, greenshift, blueshift;
 234         int i;
 235         const unsigned char *clut = logo->clut;
 236
 237         /*
 238          * We have to create a temporary palette since console palette is only
 239          * 16 colors long.
 240          */
 241         /* Bug: Doesn't obey msb_right ... (who needs that?) */
 242         redmask   = mask[info->var.red.length   < 8 ? info->var.red.length   : 8];
 243         greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
 244         bluemask  = mask[info->var.blue.length  < 8 ? info->var.blue.length  : 8];
 245         redshift   = info->var.red.offset   - (8 - info->var.red.length);
 246         greenshift = info->var.green.offset - (8 - info->var.green.length);
 247         blueshift  = info->var.blue.offset  - (8 - info->var.blue.length);
 248
 249         for ( i = 0; i < logo->clutsize; i++) {
 250                 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
 251                                  safe_shift((clut[1] & greenmask), greenshift) |
 252                                  safe_shift((clut[2] & bluemask), blueshift));
 253                 clut += 3;
 254         }
 255 }
 256
 257 static void fb_set_logo_directpalette(struct fb_info *info,
 258                                              const struct linux_logo *logo,
 259                                              u32 *palette)
 260 {
 261         int redshift, greenshift, blueshift;
 262         int i;
 263
 264         redshift = info->var.red.offset;
 265         greenshift = info->var.green.offset;
 266         blueshift = info->var.blue.offset;
 267
 268         for (i = 32; i < 32 + logo->clutsize; i++)
 269                 palette[i] = i << redshift | i << greenshift | i << blueshift;
 270 }
 271
 272 static void fb_set_logo(struct fb_info *info,
 273                                const struct linux_logo *logo, u8 *dst,
 274                                int depth)
 275 {
 276         int i, j, k;
 277         const u8 *src = logo->data;
 278         u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
 279         u8 fg = 1, d;
 280
 281         switch (fb_get_color_depth(&info->var, &info->fix)) {
 282         case 1:
 283                 fg = 1;
 284                 break;
 285         case 2:
 286                 fg = 3;
 287                 break;
 288         default:
 289                 fg = 7;
 290                 break;
 291         }
 292
 293         if (info->fix.visual == FB_VISUAL_MONO01 ||
 294             info->fix.visual == FB_VISUAL_MONO10)
 295                 fg = ~((u8) (0xfff << info->var.green.length));
 296
 297         switch (depth) {
 298         case 4:
 299                 for (i = 0; i < logo->height; i++)
 300                         for (j = 0; j < logo->width; src++) {
 301                                 *dst++ = *src >> 4;
 302                                 j++;
 303                                 if (j < logo->width) {
 304                                         *dst++ = *src & 0x0f;
 305                                         j++;
 306                                 }
 307                         }
 308                 break;
 309         case 1:
 310                 for (i = 0; i < logo->height; i++) {
 311                         for (j = 0; j < logo->width; src++) {
 312                                 d = *src ^ xor;
 313                                 for (k = 7; k >= 0; k--) {
 314                                         *dst++ = ((d >> k) & 1) ? fg : 0;
 315                                         j++;
 316                                 }
 317                         }
 318                 }
 319                 break;
 320         }
 321 }
 322
 323 /*
 324  * Three (3) kinds of logo maps exist.  linux_logo_clut224 (>16 colors),
 325  * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors).  Depending on
 326  * the visual format and color depth of the framebuffer, the DAC, the
 327  * pseudo_palette, and the logo data will be adjusted accordingly.
 328  *
 329  * Case 1 - linux_logo_clut224:
 330  * Color exceeds the number of console colors (16), thus we set the hardware DAC
 331  * using fb_set_cmap() appropriately.  The "needs_cmapreset"  flag will be set.
 332  *
 333  * For visuals that require color info from the pseudo_palette, we also construct
 334  * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
 335  * will be set.
 336  *
 337  * Case 2 - linux_logo_vga16:
 338  * The number of colors just matches the console colors, thus there is no need
 339  * to set the DAC or the pseudo_palette.  However, the bitmap is packed, ie,
 340  * each byte contains color information for two pixels (upper and lower nibble).
 341  * To be consistent with fb_imageblit() usage, we therefore separate the two
 342  * nibbles into separate bytes. The "depth" flag will be set to 4.
 343  *
 344  * Case 3 - linux_logo_mono:
 345  * This is similar with Case 2.  Each byte contains information for 8 pixels.
 346  * We isolate each bit and expand each into a byte. The "depth" flag will
 347  * be set to 1.
 348  */
 349 static struct logo_data {
 350         int depth;
 351         int needs_directpalette;
 352         int needs_truepalette;
 353         int needs_cmapreset;
 354         const struct linux_logo *logo;
 355 } fb_logo __read_mostly;
 356
 357 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
 358 {
 359         u32 size = width * height, i;
 360
 361         out += size - 1;
 362
 363         for (i = size; i--; )
 364                 *out-- = *in++;
 365 }
 366
 367 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
 368 {
 369         int i, j, h = height - 1;
 370
 371         for (i = 0; i < height; i++)
 372                 for (j = 0; j < width; j++)
 373                                 out[height * j + h - i] = *in++;
 374 }
 375
 376 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
 377 {
 378         int i, j, w = width - 1;
 379
 380         for (i = 0; i < height; i++)
 381                 for (j = 0; j < width; j++)
 382                         out[height * (w - j) + i] = *in++;
 383 }
 384
 385 static void fb_rotate_logo(struct fb_info *info, u8 *dst,
 386                            struct fb_image *image, int rotate)
 387 {
 388         u32 tmp;
 389
 390         if (rotate == FB_ROTATE_UD) {
 391                 fb_rotate_logo_ud(image->data, dst, image->width,
 392                                   image->height);
 393                 image->dx = info->var.xres - image->width - image->dx;
 394                 image->dy = info->var.yres - image->height - image->dy;
 395         } else if (rotate == FB_ROTATE_CW) {
 396                 fb_rotate_logo_cw(image->data, dst, image->width,
 397                                   image->height);
 398                 tmp = image->width;
 399                 image->width = image->height;
 400                 image->height = tmp;
 401                 tmp = image->dy;
 402                 image->dy = image->dx;
 403                 image->dx = info->var.xres - image->width - tmp;
 404         } else if (rotate == FB_ROTATE_CCW) {
 405                 fb_rotate_logo_ccw(image->data, dst, image->width,
 406                                    image->height);
 407                 tmp = image->width;
 408                 image->width = image->height;
 409                 image->height = tmp;
 410                 tmp = image->dx;
 411                 image->dx = image->dy;
 412                 image->dy = info->var.yres - image->height - tmp;
 413         }
 414
 415         image->data = dst;
 416 }
 417
 418 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
 419                             int rotate, unsigned int num)
 420 {
 421         unsigned int x;
 422
 423         if (rotate == FB_ROTATE_UR) {
 424                 for (x = 0;
 425                      x < num && image->dx + image->width <= info->var.xres;
 426                      x++) {
 427                         info->fbops->fb_imageblit(info, image);
 428                         image->dx += image->width + 8;
 429                 }
 430         } else if (rotate == FB_ROTATE_UD) {
 431                 for (x = 0; x < num && image->dx >= 0; x++) {
 432                         info->fbops->fb_imageblit(info, image);
 433                         image->dx -= image->width + 8;
 434                 }
 435         } else if (rotate == FB_ROTATE_CW) {
 436                 for (x = 0;
 437                      x < num && image->dy + image->height <= info->var.yres;
 438                      x++) {
 439                         info->fbops->fb_imageblit(info, image);
 440                         image->dy += image->height + 8;
 441                 }
 442         } else if (rotate == FB_ROTATE_CCW) {
 443                 for (x = 0; x < num && image->dy >= 0; x++) {
 444                         info->fbops->fb_imageblit(info, image);
 445                         image->dy -= image->height + 8;
 446                 }
 447         }
 448 }
 449
 450 static int fb_show_logo_line(struct fb_info *info, int rotate,
 451                              const struct linux_logo *logo, int y,
 452                              unsigned int n)
 453 {
 454         u32 *palette = NULL, *saved_pseudo_palette = NULL;
 455         unsigned char *logo_new = NULL, *logo_rotate = NULL;
 456         struct fb_image image;
 457
 458         /* Return if the frame buffer is not mapped or suspended */
 459         if (logo == NULL || info->state != FBINFO_STATE_RUNNING ||
 460             info->flags & FBINFO_MODULE)
 461                 return 0;
 462
 463         image.depth = 8;
 464         image.data = logo->data;
 465
 466         if (fb_logo.needs_cmapreset)
 467                 fb_set_logocmap(info, logo);
 468
 469         if (fb_logo.needs_truepalette ||
 470             fb_logo.needs_directpalette) {
 471                 palette = kmalloc(256 * 4, GFP_KERNEL);
 472                 if (palette == NULL)
 473                         return 0;
 474
 475                 if (fb_logo.needs_truepalette)
 476                         fb_set_logo_truepalette(info, logo, palette);
 477                 else
 478                         fb_set_logo_directpalette(info, logo, palette);
 479
 480                 saved_pseudo_palette = info->pseudo_palette;
 481                 info->pseudo_palette = palette;
 482         }
 483
 484         if (fb_logo.depth <= 4) {
 485                 logo_new = kmalloc(logo->width * logo->height, GFP_KERNEL);
 486                 if (logo_new == NULL) {
 487                         kfree(palette);
 488                         if (saved_pseudo_palette)
 489                                 info->pseudo_palette = saved_pseudo_palette;
 490                         return 0;
 491                 }
 492                 image.data = logo_new;
 493                 fb_set_logo(info, logo, logo_new, fb_logo.depth);
 494         }
 495
 496         image.dx = 0;
 497         image.dy = y;
 498         image.width = logo->width;
 499         image.height = logo->height;
 500
 501         if (rotate) {
 502                 logo_rotate = kmalloc(logo->width *
 503                                       logo->height, GFP_KERNEL);
 504                 if (logo_rotate)
 505                         fb_rotate_logo(info, logo_rotate, &image, rotate);
 506         }
 507
 508         fb_do_show_logo(info, &image, rotate, n);
 509
 510         kfree(palette);
 511         if (saved_pseudo_palette != NULL)
 512                 info->pseudo_palette = saved_pseudo_palette;
 513         kfree(logo_new);
 514         kfree(logo_rotate);
 515         return logo->height;
 516 }
 517
 518
 519 #ifdef CONFIG_FB_LOGO_EXTRA
 520
 521 #define FB_LOGO_EX_NUM_MAX 10
 522 static struct logo_data_extra {
 523         const struct linux_logo *logo;
 524         unsigned int n;
 525 } fb_logo_ex[FB_LOGO_EX_NUM_MAX];
 526 static unsigned int fb_logo_ex_num;
 527
 528 void fb_append_extra_logo(const struct linux_logo *logo, unsigned int n)
 529 {
 530         if (!n || fb_logo_ex_num == FB_LOGO_EX_NUM_MAX)
 531                 return;
 532
 533         fb_logo_ex[fb_logo_ex_num].logo = logo;
 534         fb_logo_ex[fb_logo_ex_num].n = n;
 535         fb_logo_ex_num++;
 536 }
 537
 538 static int fb_prepare_extra_logos(struct fb_info *info, unsigned int height,
 539                                   unsigned int yres)
 540 {
 541         unsigned int i;
 542
 543         /* FIXME: logo_ex supports only truecolor fb. */
 544         if (info->fix.visual != FB_VISUAL_TRUECOLOR)
 545                 fb_logo_ex_num = 0;
 546
 547         for (i = 0; i < fb_logo_ex_num; i++) {
 548                 if (fb_logo_ex[i].logo->type != fb_logo.logo->type) {
 549                         fb_logo_ex[i].logo = NULL;
 550                         continue;
 551                 }
 552                 height += fb_logo_ex[i].logo->height;
 553                 if (height > yres) {
 554                         height -= fb_logo_ex[i].logo->height;
 555                         fb_logo_ex_num = i;
 556                         break;
 557                 }
 558         }
 559         return height;
 560 }
 561
 562 static int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
 563 {
 564         unsigned int i;
 565
 566         for (i = 0; i < fb_logo_ex_num; i++)
 567                 y += fb_show_logo_line(info, rotate,
 568                                        fb_logo_ex[i].logo, y, fb_logo_ex[i].n);
 569
 570         return y;
 571 }
 572
 573 #else /* !CONFIG_FB_LOGO_EXTRA */
 574
 575 static inline int fb_prepare_extra_logos(struct fb_info *info,
 576                                          unsigned int height,
 577                                          unsigned int yres)
 578 {
 579         return height;
 580 }
 581
 582 static inline int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
 583 {
 584         return y;
 585 }
 586
 587 #endif /* CONFIG_FB_LOGO_EXTRA */
 588
 589
 590 int fb_prepare_logo(struct fb_info *info, int rotate)
 591 {
 592         int depth = fb_get_color_depth(&info->var, &info->fix);
 593         unsigned int yres;
 594
 595         memset(&fb_logo, 0, sizeof(struct logo_data));
 596
 597         if (info->flags & FBINFO_MISC_TILEBLITTING ||
 598             info->flags & FBINFO_MODULE)
 599                 return 0;
 600
 601         if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
 602                 depth = info->var.blue.length;
 603                 if (info->var.red.length < depth)
 604                         depth = info->var.red.length;
 605                 if (info->var.green.length < depth)
 606                         depth = info->var.green.length;
 607         }
 608
 609         if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) {
 610                 /* assume console colormap */
 611                 depth = 4;
 612         }
 613
 614         /* Return if no suitable logo was found */
 615         fb_logo.logo = fb_find_logo(depth);
 616
 617         if (!fb_logo.logo) {
 618                 return 0;
 619         }
 620
 621         if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
 622                 yres = info->var.yres;
 623         else
 624                 yres = info->var.xres;
 625
 626         if (fb_logo.logo->height > yres) {
 627                 fb_logo.logo = NULL;
 628                 return 0;
 629         }
 630
 631         /* What depth we asked for might be different from what we get */
 632         if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
 633                 fb_logo.depth = 8;
 634         else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
 635                 fb_logo.depth = 4;
 636         else
 637                 fb_logo.depth = 1;
 638
 639
 640         if (fb_logo.depth > 4 && depth > 4) {
 641                 switch (info->fix.visual) {
 642                 case FB_VISUAL_TRUECOLOR:
 643                         fb_logo.needs_truepalette = 1;
 644                         break;
 645                 case FB_VISUAL_DIRECTCOLOR:
 646                         fb_logo.needs_directpalette = 1;
 647                         fb_logo.needs_cmapreset = 1;
 648                         break;
 649                 case FB_VISUAL_PSEUDOCOLOR:
 650                         fb_logo.needs_cmapreset = 1;
 651                         break;
 652                 }
 653         }
 654
 655         return fb_prepare_extra_logos(info, fb_logo.logo->height, yres);
 656 }
 657
 658 int fb_show_logo(struct fb_info *info, int rotate)
 659 {
 660         int y;
 661
 662         y = fb_show_logo_line(info, rotate, fb_logo.logo, 0,
 663                               num_online_cpus());
 664         y = fb_show_extra_logos(info, y, rotate);
 665
 666         return y;
 667 }
 668 #else
 669 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
 670 int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
 671 #endif /* CONFIG_LOGO */
 672
 673 static void *fb_seq_start(struct seq_file *m, loff_t *pos)
 674 {
 675         mutex_lock(&registration_lock);
 676         return (*pos < FB_MAX) ? pos : NULL;
 677 }
 678
 679 static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos)
 680 {
 681         (*pos)++;
 682         return (*pos < FB_MAX) ? pos : NULL;
 683 }
 684
 685 static void fb_seq_stop(struct seq_file *m, void *v)
 686 {
 687         mutex_unlock(&registration_lock);
 688 }
 689
 690 static int fb_seq_show(struct seq_file *m, void *v)
 691 {
 692         int i = *(loff_t *)v;
 693         struct fb_info *fi = registered_fb[i];
 694
 695         if (fi)
 696                 seq_printf(m, "%d %s\n", fi->node, fi->fix.id);
 697         return 0;
 698 }
 699
 700 static const struct seq_operations proc_fb_seq_ops = {
 701         .start  = fb_seq_start,
 702         .next   = fb_seq_next,
 703         .stop   = fb_seq_stop,
 704         .show   = fb_seq_show,
 705 };
 706
 707 static int proc_fb_open(struct inode *inode, struct file *file)
 708 {
 709         return seq_open(file, &proc_fb_seq_ops);
 710 }
 711
 712 static const struct file_operations fb_proc_fops = {
 713         .owner          = THIS_MODULE,
 714         .open           = proc_fb_open,
 715         .read           = seq_read,
 716         .llseek         = seq_lseek,
 717         .release        = seq_release,
 718 };
 719
 720 /*
 721  * We hold a reference to the fb_info in file->private_data,
 722  * but if the current registered fb has changed, we don't
 723  * actually want to use it.
 724  *
 725  * So look up the fb_info using the inode minor number,
 726  * and just verify it against the reference we have.
 727  */
 728 static struct fb_info *file_fb_info(struct file *file)
 729 {
 730         struct inode *inode = file->f_path.dentry->d_inode;
 731         int fbidx = iminor(inode);
 732         struct fb_info *info = registered_fb[fbidx];
 733
 734         if (info != file->private_data)
 735                 info = NULL;
 736         return info;
 737 }
 738
 739 static ssize_t
 740 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 741 {
 742         unsigned long p = *ppos;
 743         struct fb_info *info = file_fb_info(file);
 744         u8 *buffer, *dst;
 745         u8 __iomem *src;
 746         int c, cnt = 0, err = 0;
 747         unsigned long total_size;
 748
 749         if (!info || ! info->screen_base)
 750                 return -ENODEV;
 751
 752         if (info->state != FBINFO_STATE_RUNNING)
 753                 return -EPERM;
 754
 755         if (info->fbops->fb_read)
 756                 return info->fbops->fb_read(info, buf, count, ppos);
 757
 758         total_size = info->screen_size;
 759
 760         if (total_size == 0)
 761                 total_size = info->fix.smem_len;
 762
 763         if (p >= total_size)
 764                 return 0;
 765
 766         if (count >= total_size)
 767                 count = total_size;
 768
 769         if (count + p > total_size)
 770                 count = total_size - p;
 771
 772         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 773                          GFP_KERNEL);
 774         if (!buffer)
 775                 return -ENOMEM;
 776
 777         src = (u8 __iomem *) (info->screen_base + p);
 778
 779         if (info->fbops->fb_sync)
 780                 info->fbops->fb_sync(info);
 781
 782         while (count) {
 783                 c  = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 784                 dst = buffer;
 785                 fb_memcpy_fromfb(dst, src, c);
 786                 dst += c;
 787                 src += c;
 788
 789                 if (copy_to_user(buf, buffer, c)) {
 790                         err = -EFAULT;
 791                         break;
 792                 }
 793                 *ppos += c;
 794                 buf += c;
 795                 cnt += c;
 796                 count -= c;
 797         }
 798
 799         kfree(buffer);
 800
 801         return (err) ? err : cnt;
 802 }
 803
 804 static ssize_t
 805 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 806 {
 807         unsigned long p = *ppos;
 808         struct fb_info *info = file_fb_info(file);
 809         u8 *buffer, *src;
 810         u8 __iomem *dst;
 811         int c, cnt = 0, err = 0;
 812         unsigned long total_size;
 813
 814         if (!info || !info->screen_base)
 815                 return -ENODEV;
 816
 817         if (info->state != FBINFO_STATE_RUNNING)
 818                 return -EPERM;
 819
 820         if (info->fbops->fb_write)
 821                 return info->fbops->fb_write(info, buf, count, ppos);
 822
 823         total_size = info->screen_size;
 824
 825         if (total_size == 0)
 826                 total_size = info->fix.smem_len;
 827
 828         if (p > total_size)
 829                 return -EFBIG;
 830
 831         if (count > total_size) {
 832                 err = -EFBIG;
 833                 count = total_size;
 834         }
 835
 836         if (count + p > total_size) {
 837                 if (!err)
 838                         err = -ENOSPC;
 839
 840                 count = total_size - p;
 841         }
 842
 843         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 844                          GFP_KERNEL);
 845         if (!buffer)
 846                 return -ENOMEM;
 847
 848         dst = (u8 __iomem *) (info->screen_base + p);
 849
 850         if (info->fbops->fb_sync)
 851                 info->fbops->fb_sync(info);
 852
 853         while (count) {
 854                 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 855                 src = buffer;
 856
 857                 if (copy_from_user(src, buf, c)) {
 858                         err = -EFAULT;
 859                         break;
 860                 }
 861
 862                 fb_memcpy_tofb(dst, src, c);
 863                 dst += c;
 864                 src += c;
 865                 *ppos += c;
 866                 buf += c;
 867                 cnt += c;
 868                 count -= c;
 869         }
 870
 871         kfree(buffer);
 872
 873         return (cnt) ? cnt : err;
 874 }
 875
 876 int
 877 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
 878 {
 879         struct fb_fix_screeninfo *fix = &info->fix;
 880         unsigned int yres = info->var.yres;
 881         int err = 0;
 882
 883         if (var->yoffset > 0) {
 884                 if (var->vmode & FB_VMODE_YWRAP) {
 885                         if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
 886                                 err = -EINVAL;
 887                         else
 888                                 yres = 0;
 889                 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
 890                         err = -EINVAL;
 891         }
 892
 893         if (var->xoffset > 0 && (!fix->xpanstep ||
 894                                  (var->xoffset % fix->xpanstep)))
 895                 err = -EINVAL;
 896
 897         if (err || !info->fbops->fb_pan_display ||
 898             var->yoffset > info->var.yres_virtual - yres ||
 899             var->xoffset > info->var.xres_virtual - info->var.xres)
 900                 return -EINVAL;
 901
 902         if ((err = info->fbops->fb_pan_display(var, info)))
 903                 return err;
 904         info->var.xoffset = var->xoffset;
 905         info->var.yoffset = var->yoffset;
 906         if (var->vmode & FB_VMODE_YWRAP)
 907                 info->var.vmode |= FB_VMODE_YWRAP;
 908         else
 909                 info->var.vmode &= ~FB_VMODE_YWRAP;
 910         return 0;
 911 }
 912
 913 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var,
 914                          u32 activate)
 915 {
 916         struct fb_event event;
 917         struct fb_blit_caps caps, fbcaps;
 918         int err = 0;
 919
 920         memset(&caps, 0, sizeof(caps));
 921         memset(&fbcaps, 0, sizeof(fbcaps));
 922         caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0;
 923         event.info = info;
 924         event.data = &caps;
 925         fb_notifier_call_chain(FB_EVENT_GET_REQ, &event);
 926         info->fbops->fb_get_caps(info, &fbcaps, var);
 927
 928         if (((fbcaps.x ^ caps.x) & caps.x) ||
 929             ((fbcaps.y ^ caps.y) & caps.y) ||
 930             (fbcaps.len < caps.len))
 931                 err = -EINVAL;
 932
 933         return err;
 934 }
 935
 936 int
 937 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
 938 {
 939         int flags = info->flags;
 940         int ret = 0;
 941
 942         if (var->activate & FB_ACTIVATE_INV_MODE) {
 943                 struct fb_videomode mode1, mode2;
 944
 945                 fb_var_to_videomode(&mode1, var);
 946                 fb_var_to_videomode(&mode2, &info->var);
 947                 /* make sure we don't delete the videomode of current var */
 948                 ret = fb_mode_is_equal(&mode1, &mode2);
 949
 950                 if (!ret) {
 951                     struct fb_event event;
 952
 953                     event.info = info;
 954                     event.data = &mode1;
 955                     ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event);
 956                 }
 957
 958                 if (!ret)
 959                     fb_delete_videomode(&mode1, &info->modelist);
 960
 961
 962                 ret = (ret) ? -EINVAL : 0;
 963                 goto done;
 964         }
 965
 966         if ((var->activate & FB_ACTIVATE_FORCE) ||
 967             memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
 968                 u32 activate = var->activate;
 969
 970                 if (!info->fbops->fb_check_var) {
 971                         *var = info->var;
 972                         goto done;
 973                 }
 974
 975                 ret = info->fbops->fb_check_var(var, info);
 976
 977                 if (ret)
 978                         goto done;
 979
 980                 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
 981                         struct fb_var_screeninfo old_var;
 982                         struct fb_videomode mode;
 983
 984                         if (info->fbops->fb_get_caps) {
 985                                 ret = fb_check_caps(info, var, activate);
 986
 987                                 if (ret)
 988                                         goto done;
 989                         }
 990
 991                         old_var = info->var;
 992                         info->var = *var;
 993
 994                         if (info->fbops->fb_set_par) {
 995                                 ret = info->fbops->fb_set_par(info);
 996
 997                                 if (ret) {
 998                                         info->var = old_var;
 999                                         printk(KERN_WARNING "detected "
1000                                                 "fb_set_par error, "
1001                                                 "error code: %d\n", ret);
1002                                         goto done;
1003                                 }
1004                         }
1005
1006                         fb_pan_display(info, &info->var);
1007                         fb_set_cmap(&info->cmap, info);
1008                         fb_var_to_videomode(&mode, &info->var);
1009
1010                         if (info->modelist.prev && info->modelist.next &&
1011                             !list_empty(&info->modelist))
1012                                 ret = fb_add_videomode(&mode, &info->modelist);
1013
1014                         if (!ret && (flags & FBINFO_MISC_USEREVENT)) {
1015                                 struct fb_event event;
1016                                 int evnt = (activate & FB_ACTIVATE_ALL) ?
1017                                         FB_EVENT_MODE_CHANGE_ALL :
1018                                         FB_EVENT_MODE_CHANGE;
1019
1020                                 info->flags &= ~FBINFO_MISC_USEREVENT;
1021                                 event.info = info;
1022                                 event.data = &mode;
1023                                 fb_notifier_call_chain(evnt, &event);
1024                         }
1025                 }
1026         }
1027
1028  done:
1029         return ret;
1030 }
1031
1032 int
1033 fb_blank(struct fb_info *info, int blank)
1034 {
1035         int ret = -EINVAL;
1036
1037         if (blank > FB_BLANK_POWERDOWN)
1038                 blank = FB_BLANK_POWERDOWN;
1039
1040         if (info->fbops->fb_blank)
1041                 ret = info->fbops->fb_blank(blank, info);
1042
1043         if (!ret) {
1044                 struct fb_event event;
1045
1046                 event.info = info;
1047                 event.data = &blank;
1048                 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
1049         }
1050
1051         return ret;
1052 }
1053
1054 static long do_fb_ioctl(struct fb_info *info, unsigned int cmd,
1055                         unsigned long arg)
1056 {
1057         struct fb_ops *fb;
1058         struct fb_var_screeninfo var;
1059         struct fb_fix_screeninfo fix;
1060         struct fb_con2fbmap con2fb;
1061         struct fb_cmap cmap_from;
1062         struct fb_cmap_user cmap;
1063         struct fb_event event;
1064         void __user *argp = (void __user *)arg;
1065         long ret = 0;
1066
1067         switch (cmd) {
1068         case FBIOGET_VSCREENINFO:
1069                 if (!lock_fb_info(info))
1070                         return -ENODEV;
1071                 var = info->var;
1072                 unlock_fb_info(info);
1073
1074                 ret = copy_to_user(argp, &var, sizeof(var)) ? -EFAULT : 0;
1075                 break;
1076         case FBIOPUT_VSCREENINFO:
1077                 if (copy_from_user(&var, argp, sizeof(var)))
1078                         return -EFAULT;
1079                 if (!lock_fb_info(info))
1080                         return -ENODEV;
1081                 console_lock();
1082                 info->flags |= FBINFO_MISC_USEREVENT;
1083                 ret = fb_set_var(info, &var);
1084                 info->flags &= ~FBINFO_MISC_USEREVENT;
1085                 console_unlock();
1086                 unlock_fb_info(info);
1087                 if (!ret && copy_to_user(argp, &var, sizeof(var)))
1088                         ret = -EFAULT;
1089                 break;
1090         case FBIOGET_FSCREENINFO:
1091                 if (!lock_fb_info(info))
1092                         return -ENODEV;
1093                 fix = info->fix;
1094                 unlock_fb_info(info);
1095
1096                 ret = copy_to_user(argp, &fix, sizeof(fix)) ? -EFAULT : 0;
1097                 break;
1098         case FBIOPUTCMAP:
1099                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1100                         return -EFAULT;
1101                 ret = fb_set_user_cmap(&cmap, info);
1102                 break;
1103         case FBIOGETCMAP:
1104                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1105                         return -EFAULT;
1106                 if (!lock_fb_info(info))
1107                         return -ENODEV;
1108                 cmap_from = info->cmap;
1109                 unlock_fb_info(info);
1110                 ret = fb_cmap_to_user(&cmap_from, &cmap);
1111                 break;
1112         case FBIOPAN_DISPLAY:
1113                 if (copy_from_user(&var, argp, sizeof(var)))
1114                         return -EFAULT;
1115                 if (!lock_fb_info(info))
1116                         return -ENODEV;
1117                 console_lock();
1118                 ret = fb_pan_display(info, &var);
1119                 console_unlock();
1120                 unlock_fb_info(info);
1121                 if (ret == 0 && copy_to_user(argp, &var, sizeof(var)))
1122                         return -EFAULT;
1123                 break;
1124         case FBIO_CURSOR:
1125                 ret = -EINVAL;
1126                 break;
1127         case FBIOGET_CON2FBMAP:
1128                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1129                         return -EFAULT;
1130                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1131                         return -EINVAL;
1132                 con2fb.framebuffer = -1;
1133                 event.data = &con2fb;
1134                 if (!lock_fb_info(info))
1135                         return -ENODEV;
1136                 event.info = info;
1137                 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
1138                 unlock_fb_info(info);
1139                 ret = copy_to_user(argp, &con2fb, sizeof(con2fb)) ? -EFAULT : 0;
1140                 break;
1141         case FBIOPUT_CON2FBMAP:
1142                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1143                         return -EFAULT;
1144                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1145                         return -EINVAL;
1146                 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
1147                         return -EINVAL;
1148                 if (!registered_fb[con2fb.framebuffer])
1149                         request_module("fb%d", con2fb.framebuffer);
1150                 if (!registered_fb[con2fb.framebuffer]) {
1151                         ret = -EINVAL;
1152                         break;
1153                 }
1154                 event.data = &con2fb;
1155                 if (!lock_fb_info(info))
1156                         return -ENODEV;
1157                 event.info = info;
1158                 ret = fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP, &event);
1159                 unlock_fb_info(info);
1160                 break;
1161         case FBIOBLANK:
1162                 if (!lock_fb_info(info))
1163                         return -ENODEV;
1164                 console_lock();
1165                 info->flags |= FBINFO_MISC_USEREVENT;
1166                 ret = fb_blank(info, arg);
1167                 info->flags &= ~FBINFO_MISC_USEREVENT;
1168                 console_unlock();
1169                 unlock_fb_info(info);
1170                 break;
1171         default:
1172                 if (!lock_fb_info(info))
1173                         return -ENODEV;
1174                 fb = info->fbops;
1175                 if (fb->fb_ioctl)
1176                         ret = fb->fb_ioctl(info, cmd, arg);
1177                 else
1178                         ret = -ENOTTY;
1179                 unlock_fb_info(info);
1180         }
1181         return ret;
1182 }
1183
1184 static long fb_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1185 {
1186         struct fb_info *info = file_fb_info(file);
1187
1188         if (!info)
1189                 return -ENODEV;
1190         return do_fb_ioctl(info, cmd, arg);
1191 }
1192
1193 #ifdef CONFIG_COMPAT
1194 struct fb_fix_screeninfo32 {
1195         char                    id[16];
1196         compat_caddr_t          smem_start;
1197         u32                     smem_len;
1198         u32                     type;
1199         u32                     type_aux;
1200         u32                     visual;
1201         u16                     xpanstep;
1202         u16                     ypanstep;
1203         u16                     ywrapstep;
1204         u32                     line_length;
1205         compat_caddr_t          mmio_start;
1206         u32                     mmio_len;
1207         u32                     accel;
1208         u16                     reserved[3];
1209 };
1210
1211 struct fb_cmap32 {
1212         u32                     start;
1213         u32                     len;
1214         compat_caddr_t  red;
1215         compat_caddr_t  green;
1216         compat_caddr_t  blue;
1217         compat_caddr_t  transp;
1218 };
1219
1220 static int fb_getput_cmap(struct fb_info *info, unsigned int cmd,
1221                           unsigned long arg)
1222 {
1223         struct fb_cmap_user __user *cmap;
1224         struct fb_cmap32 __user *cmap32;
1225         __u32 data;
1226         int err;
1227
1228         cmap = compat_alloc_user_space(sizeof(*cmap));
1229         cmap32 = compat_ptr(arg);
1230
1231         if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1232                 return -EFAULT;
1233
1234         if (get_user(data, &cmap32->red) ||
1235             put_user(compat_ptr(data), &cmap->red) ||
1236             get_user(data, &cmap32->green) ||
1237             put_user(compat_ptr(data), &cmap->green) ||
1238             get_user(data, &cmap32->blue) ||
1239             put_user(compat_ptr(data), &cmap->blue) ||
1240             get_user(data, &cmap32->transp) ||
1241             put_user(compat_ptr(data), &cmap->transp))
1242                 return -EFAULT;
1243
1244         err = do_fb_ioctl(info, cmd, (unsigned long) cmap);
1245
1246         if (!err) {
1247                 if (copy_in_user(&cmap32->start,
1248                                  &cmap->start,
1249                                  2 * sizeof(__u32)))
1250                         err = -EFAULT;
1251         }
1252         return err;
1253 }
1254
1255 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1256                                   struct fb_fix_screeninfo32 __user *fix32)
1257 {
1258         __u32 data;
1259         int err;
1260
1261         err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1262
1263         data = (__u32) (unsigned long) fix->smem_start;
1264         err |= put_user(data, &fix32->smem_start);
1265
1266         err |= put_user(fix->smem_len, &fix32->smem_len);
1267         err |= put_user(fix->type, &fix32->type);
1268         err |= put_user(fix->type_aux, &fix32->type_aux);
1269         err |= put_user(fix->visual, &fix32->visual);
1270         err |= put_user(fix->xpanstep, &fix32->xpanstep);
1271         err |= put_user(fix->ypanstep, &fix32->ypanstep);
1272         err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1273         err |= put_user(fix->line_length, &fix32->line_length);
1274
1275         data = (__u32) (unsigned long) fix->mmio_start;
1276         err |= put_user(data, &fix32->mmio_start);
1277
1278         err |= put_user(fix->mmio_len, &fix32->mmio_len);
1279         err |= put_user(fix->accel, &fix32->accel);
1280         err |= copy_to_user(fix32->reserved, fix->reserved,
1281                             sizeof(fix->reserved));
1282
1283         return err;
1284 }
1285
1286 static int fb_get_fscreeninfo(struct fb_info *info, unsigned int cmd,
1287                               unsigned long arg)
1288 {
1289         mm_segment_t old_fs;
1290         struct fb_fix_screeninfo fix;
1291         struct fb_fix_screeninfo32 __user *fix32;
1292         int err;
1293
1294         fix32 = compat_ptr(arg);
1295
1296         old_fs = get_fs();
1297         set_fs(KERNEL_DS);
1298         err = do_fb_ioctl(info, cmd, (unsigned long) &fix);
1299         set_fs(old_fs);
1300
1301         if (!err)
1302                 err = do_fscreeninfo_to_user(&fix, fix32);
1303
1304         return err;
1305 }
1306
1307 static long fb_compat_ioctl(struct file *file, unsigned int cmd,
1308                             unsigned long arg)
1309 {
1310         struct fb_info *info = file_fb_info(file);
1311         struct fb_ops *fb;
1312         long ret = -ENOIOCTLCMD;
1313
1314         if (!info)
1315                 return -ENODEV;
1316         fb = info->fbops;
1317         switch(cmd) {
1318         case FBIOGET_VSCREENINFO:
1319         case FBIOPUT_VSCREENINFO:
1320         case FBIOPAN_DISPLAY:
1321         case FBIOGET_CON2FBMAP:
1322         case FBIOPUT_CON2FBMAP:
1323                 arg = (unsigned long) compat_ptr(arg);
1324         case FBIOBLANK:
1325                 ret = do_fb_ioctl(info, cmd, arg);
1326                 break;
1327
1328         case FBIOGET_FSCREENINFO:
1329                 ret = fb_get_fscreeninfo(info, cmd, arg);
1330                 break;
1331
1332         case FBIOGETCMAP:
1333         case FBIOPUTCMAP:
1334                 ret = fb_getput_cmap(info, cmd, arg);
1335                 break;
1336
1337         default:
1338                 if (fb->fb_compat_ioctl)
1339                         ret = fb->fb_compat_ioctl(info, cmd, arg);
1340                 break;
1341         }
1342         return ret;
1343 }
1344 #endif
1345
1346 static int
1347 fb_mmap(struct file *file, struct vm_area_struct * vma)
1348 {
1349         struct fb_info *info = file_fb_info(file);
1350         struct fb_ops *fb;
1351         unsigned long off;
1352         unsigned long start;
1353         u32 len;
1354
1355         if (!info)
1356                 return -ENODEV;
1357         if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
1358                 return -EINVAL;
1359         off = vma->vm_pgoff << PAGE_SHIFT;
1360         fb = info->fbops;
1361         if (!fb)
1362                 return -ENODEV;
1363         mutex_lock(&info->mm_lock);
1364         if (fb->fb_mmap) {
1365                 int res;
1366                 res = fb->fb_mmap(info, vma);
1367                 mutex_unlock(&info->mm_lock);
1368                 return res;
1369         }
1370
1371         /* frame buffer memory */
1372         start = info->fix.smem_start;
1373         len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
1374         if (off >= len) {
1375                 /* memory mapped io */
1376                 off -= len;
1377                 if (info->var.accel_flags) {
1378                         mutex_unlock(&info->mm_lock);
1379                         return -EINVAL;
1380                 }
1381                 start = info->fix.mmio_start;
1382                 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
1383         }
1384         mutex_unlock(&info->mm_lock);
1385         start &= PAGE_MASK;
1386         if ((vma->vm_end - vma->vm_start + off) > len)
1387                 return -EINVAL;
1388         off += start;
1389         vma->vm_pgoff = off >> PAGE_SHIFT;
1390         /* This is an IO map - tell maydump to skip this VMA */
1391         vma->vm_flags |= VM_IO | VM_RESERVED;
1392         vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
1393         fb_pgprotect(file, vma, off);
1394         if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1395                              vma->vm_end - vma->vm_start, vma->vm_page_prot))
1396                 return -EAGAIN;
1397         return 0;
1398 }
1399
1400 static int
1401 fb_open(struct inode *inode, struct file *file)
1402 __acquires(&info->lock)
1403 __releases(&info->lock)
1404 {
1405         int fbidx = iminor(inode);
1406         struct fb_info *info;
1407         int res = 0;
1408
1409         info = get_fb_info(fbidx);
1410         if (!info) {
1411                 request_module("fb%d", fbidx);
1412                 info = get_fb_info(fbidx);
1413                 if (!info)
1414                         return -ENODEV;
1415         }
1416         if (IS_ERR(info))
1417                 return PTR_ERR(info);
1418
1419         mutex_lock(&info->lock);
1420         if (!try_module_get(info->fbops->owner)) {
1421                 res = -ENODEV;
1422                 goto out;
1423         }
1424         file->private_data = info;
1425         if (info->fbops->fb_open) {
1426                 res = info->fbops->fb_open(info,1);
1427                 if (res)
1428                         module_put(info->fbops->owner);
1429         }
1430 #ifdef CONFIG_FB_DEFERRED_IO
1431         if (info->fbdefio)
1432                 fb_deferred_io_open(info, inode, file);
1433 #endif
1434 out:
1435         mutex_unlock(&info->lock);
1436         if (res)
1437                 put_fb_info(info);
1438         return res;
1439 }
1440
1441 static int
1442 fb_release(struct inode *inode, struct file *file)
1443 __acquires(&info->lock)
1444 __releases(&info->lock)
1445 {
1446         struct fb_info * const info = file->private_data;
1447
1448         mutex_lock(&info->lock);
1449         if (info->fbops->fb_release)
1450                 info->fbops->fb_release(info,1);
1451         module_put(info->fbops->owner);
1452         mutex_unlock(&info->lock);
1453         put_fb_info(info);
1454         return 0;
1455 }
1456
1457 static const struct file_operations fb_fops = {
1458         .owner =        THIS_MODULE,
1459         .read =         fb_read,
1460         .write =        fb_write,
1461         .unlocked_ioctl = fb_ioctl,
1462 #ifdef CONFIG_COMPAT
1463         .compat_ioctl = fb_compat_ioctl,
1464 #endif
1465         .mmap =         fb_mmap,
1466         .open =         fb_open,
1467         .release =      fb_release,
1468 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1469         .get_unmapped_area = get_fb_unmapped_area,
1470 #endif
1471 #ifdef CONFIG_FB_DEFERRED_IO
1472         .fsync =        fb_deferred_io_fsync,
1473 #endif
1474         .llseek =       default_llseek,
1475 };
1476
1477 struct class *fb_class;
1478 EXPORT_SYMBOL(fb_class);
1479
1480 static int fb_check_foreignness(struct fb_info *fi)
1481 {
1482         const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN;
1483
1484         fi->flags &= ~FBINFO_FOREIGN_ENDIAN;
1485
1486 #ifdef __BIG_ENDIAN
1487         fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH;
1488 #else
1489         fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0;
1490 #endif /* __BIG_ENDIAN */
1491
1492         if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) {
1493                 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to "
1494                        "support this framebuffer\n", fi->fix.id);
1495                 return -ENOSYS;
1496         } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) {
1497                 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to "
1498                        "support this framebuffer\n", fi->fix.id);
1499                 return -ENOSYS;
1500         }
1501
1502         return 0;
1503 }
1504
1505 static bool apertures_overlap(struct aperture *gen, struct aperture *hw)
1506 {
1507         /* is the generic aperture base the same as the HW one */
1508         if (gen->base == hw->base)
1509                 return true;
1510         /* is the generic aperture base inside the hw base->hw base+size */
1511         if (gen->base > hw->base && gen->base < hw->base + hw->size)
1512                 return true;
1513         return false;
1514 }
1515
1516 static bool fb_do_apertures_overlap(struct apertures_struct *gena,
1517                                     struct apertures_struct *hwa)
1518 {
1519         int i, j;
1520         if (!hwa || !gena)
1521                 return false;
1522
1523         for (i = 0; i < hwa->count; ++i) {
1524                 struct aperture *h = &hwa->ranges[i];
1525                 for (j = 0; j < gena->count; ++j) {
1526                         struct aperture *g = &gena->ranges[j];
1527                         printk(KERN_DEBUG "checking generic (%llx %llx) vs hw (%llx %llx)\n",
1528                                 (unsigned long long)g->base,
1529                                 (unsigned long long)g->size,
1530                                 (unsigned long long)h->base,
1531                                 (unsigned long long)h->size);
1532                         if (apertures_overlap(g, h))
1533                                 return true;
1534                 }
1535         }
1536
1537         return false;
1538 }
1539
1540 static int do_unregister_framebuffer(struct fb_info *fb_info);
1541
1542 #define VGA_FB_PHYS 0xA0000
1543 static void do_remove_conflicting_framebuffers(struct apertures_struct *a,
1544                                      const char *name, bool primary)
1545 {
1546         int i;
1547
1548         /* check all firmware fbs and kick off if the base addr overlaps */
1549         for (i = 0 ; i < FB_MAX; i++) {
1550                 struct apertures_struct *gen_aper;
1551                 if (!registered_fb[i])
1552                         continue;
1553
1554                 if (!(registered_fb[i]->flags & FBINFO_MISC_FIRMWARE))
1555                         continue;
1556
1557                 gen_aper = registered_fb[i]->apertures;
1558                 if (fb_do_apertures_overlap(gen_aper, a) ||
1559                         (primary && gen_aper && gen_aper->count &&
1560                          gen_aper->ranges[0].base == VGA_FB_PHYS)) {
1561
1562                         printk(KERN_INFO "fb: conflicting fb hw usage "
1563                                "%s vs %s - removing generic driver\n",
1564                                name, registered_fb[i]->fix.id);
1565                         do_unregister_framebuffer(registered_fb[i]);
1566                 }
1567         }
1568 }
1569
1570 static int do_register_framebuffer(struct fb_info *fb_info)
1571 {
1572         int i;
1573         struct fb_event event;
1574         struct fb_videomode mode;
1575
1576         if (fb_check_foreignness(fb_info))
1577                 return -ENOSYS;
1578
1579         do_remove_conflicting_framebuffers(fb_info->apertures, fb_info->fix.id,
1580                                          fb_is_primary_device(fb_info));
1581
1582         if (num_registered_fb == FB_MAX)
1583                 return -ENXIO;
1584
1585         num_registered_fb++;
1586         for (i = 0 ; i < FB_MAX; i++)
1587                 if (!registered_fb[i])
1588                         break;
1589         fb_info->node = i;
1590         atomic_set(&fb_info->count, 1);
1591         mutex_init(&fb_info->lock);
1592         mutex_init(&fb_info->mm_lock);
1593
1594         fb_info->dev = device_create(fb_class, fb_info->device,
1595                                      MKDEV(FB_MAJOR, i), NULL, "fb%d", i);
1596         if (IS_ERR(fb_info->dev)) {
1597                 /* Not fatal */
1598                 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1599                 fb_info->dev = NULL;
1600         } else
1601                 fb_init_device(fb_info);
1602
1603         if (fb_info->pixmap.addr == NULL) {
1604                 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1605                 if (fb_info->pixmap.addr) {
1606                         fb_info->pixmap.size = FBPIXMAPSIZE;
1607                         fb_info->pixmap.buf_align = 1;
1608                         fb_info->pixmap.scan_align = 1;
1609                         fb_info->pixmap.access_align = 32;
1610                         fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1611                 }
1612         }
1613         fb_info->pixmap.offset = 0;
1614
1615         if (!fb_info->pixmap.blit_x)
1616                 fb_info->pixmap.blit_x = ~(u32)0;
1617
1618         if (!fb_info->pixmap.blit_y)
1619                 fb_info->pixmap.blit_y = ~(u32)0;
1620
1621         if (!fb_info->modelist.prev || !fb_info->modelist.next)
1622                 INIT_LIST_HEAD(&fb_info->modelist);
1623
1624         fb_var_to_videomode(&mode, &fb_info->var);
1625         fb_add_videomode(&mode, &fb_info->modelist);
1626         registered_fb[i] = fb_info;
1627
1628         event.info = fb_info;
1629         if (!lock_fb_info(fb_info))
1630                 return -ENODEV;
1631         fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1632         unlock_fb_info(fb_info);
1633         return 0;
1634 }
1635
1636 static int do_unregister_framebuffer(struct fb_info *fb_info)
1637 {
1638         struct fb_event event;
1639         int i, ret = 0;
1640
1641         i = fb_info->node;
1642         if (i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)
1643                 return -EINVAL;
1644
1645         if (!lock_fb_info(fb_info))
1646                 return -ENODEV;
1647         event.info = fb_info;
1648         ret = fb_notifier_call_chain(FB_EVENT_FB_UNBIND, &event);
1649         unlock_fb_info(fb_info);
1650
1651         if (ret)
1652                 return -EINVAL;
1653
1654         if (fb_info->pixmap.addr &&
1655             (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1656                 kfree(fb_info->pixmap.addr);
1657         fb_destroy_modelist(&fb_info->modelist);
1658         registered_fb[i] = NULL;
1659         num_registered_fb--;
1660         fb_cleanup_device(fb_info);
1661         device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1662         event.info = fb_info;
1663         fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1664
1665         /* this may free fb info */
1666         put_fb_info(fb_info);
1667         return 0;
1668 }
1669
1670 void remove_conflicting_framebuffers(struct apertures_struct *a,
1671                                      const char *name, bool primary)
1672 {
1673         mutex_lock(&registration_lock);
1674         do_remove_conflicting_framebuffers(a, name, primary);
1675         mutex_unlock(&registration_lock);
1676 }
1677 EXPORT_SYMBOL(remove_conflicting_framebuffers);
1678
1679 /**
1680  *      register_framebuffer - registers a frame buffer device
1681  *      @fb_info: frame buffer info structure
1682  *
1683  *      Registers a frame buffer device @fb_info.
1684  *
1685  *      Returns negative errno on error, or zero for success.
1686  *
1687  */
1688 int
1689 register_framebuffer(struct fb_info *fb_info)
1690 {
1691         int ret;
1692
1693         mutex_lock(&registration_lock);
1694         ret = do_register_framebuffer(fb_info);
1695         mutex_unlock(&registration_lock);
1696
1697         return ret;
1698 }
1699
1700 /**
1701  *      unregister_framebuffer - releases a frame buffer device
1702  *      @fb_info: frame buffer info structure
1703  *
1704  *      Unregisters a frame buffer device @fb_info.
1705  *
1706  *      Returns negative errno on error, or zero for success.
1707  *
1708  *      This function will also notify the framebuffer console
1709  *      to release the driver.
1710  *
1711  *      This is meant to be called within a driver's module_exit()
1712  *      function. If this is called outside module_exit(), ensure
1713  *      that the driver implements fb_open() and fb_release() to
1714  *      check that no processes are using the device.
1715  */
1716 int
1717 unregister_framebuffer(struct fb_info *fb_info)
1718 {
1719         int ret;
1720
1721         mutex_lock(&registration_lock);
1722         ret = do_unregister_framebuffer(fb_info);
1723         mutex_unlock(&registration_lock);
1724
1725         return ret;
1726 }
1727
1728 /**
1729  *      fb_set_suspend - low level driver signals suspend
1730  *      @info: framebuffer affected
1731  *      @state: 0 = resuming, !=0 = suspending
1732  *
1733  *      This is meant to be used by low level drivers to
1734  *      signal suspend/resume to the core & clients.
1735  *      It must be called with the console semaphore held
1736  */
1737 void fb_set_suspend(struct fb_info *info, int state)
1738 {
1739         struct fb_event event;
1740
1741         event.info = info;
1742         if (state) {
1743                 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event);
1744                 info->state = FBINFO_STATE_SUSPENDED;
1745         } else {
1746                 info->state = FBINFO_STATE_RUNNING;
1747                 fb_notifier_call_chain(FB_EVENT_RESUME, &event);
1748         }
1749 }
1750
1751 /**
1752  *      fbmem_init - init frame buffer subsystem
1753  *
1754  *      Initialize the frame buffer subsystem.
1755  *
1756  *      NOTE: This function is _only_ to be called by drivers/char/mem.c.
1757  *
1758  */
1759
1760 static int __init
1761 fbmem_init(void)
1762 {
1763         proc_create("fb", 0, NULL, &fb_proc_fops);
1764
1765         if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1766                 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1767
1768         fb_class = class_create(THIS_MODULE, "graphics");
1769         if (IS_ERR(fb_class)) {
1770                 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1771                 fb_class = NULL;
1772         }
1773         return 0;
1774 }
1775
1776 #ifdef MODULE
1777 module_init(fbmem_init);
1778 static void __exit
1779 fbmem_exit(void)
1780 {
1781         remove_proc_entry("fb", NULL);
1782         class_destroy(fb_class);
1783         unregister_chrdev(FB_MAJOR, "fb");
1784 }
1785
1786 module_exit(fbmem_exit);
1787 MODULE_LICENSE("GPL");
1788 MODULE_DESCRIPTION("Framebuffer base");
1789 #else
1790 subsys_initcall(fbmem_init);
1791 #endif
1792
1793 int fb_new_modelist(struct fb_info *info)
1794 {
1795         struct fb_event event;
1796         struct fb_var_screeninfo var = info->var;
1797         struct list_head *pos, *n;
1798         struct fb_modelist *modelist;
1799         struct fb_videomode *m, mode;
1800         int err = 1;
1801
1802         list_for_each_safe(pos, n, &info->modelist) {
1803                 modelist = list_entry(pos, struct fb_modelist, list);
1804                 m = &modelist->mode;
1805                 fb_videomode_to_var(&var, m);
1806                 var.activate = FB_ACTIVATE_TEST;
1807                 err = fb_set_var(info, &var);
1808                 fb_var_to_videomode(&mode, &var);
1809                 if (err || !fb_mode_is_equal(m, &mode)) {
1810                         list_del(pos);
1811                         kfree(pos);
1812                 }
1813         }
1814
1815         err = 1;
1816
1817         if (!list_empty(&info->modelist)) {
1818                 if (!lock_fb_info(info))
1819                         return -ENODEV;
1820                 event.info = info;
1821                 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
1822                 unlock_fb_info(info);
1823         }
1824
1825         return err;
1826 }
1827
1828 static char *video_options[FB_MAX] __read_mostly;
1829 static int ofonly __read_mostly;
1830
1831 /**
1832  * fb_get_options - get kernel boot parameters
1833  * @name:   framebuffer name as it would appear in
1834  *          the boot parameter line
1835  *          (video=<name>:<options>)
1836  * @option: the option will be stored here
1837  *
1838  * NOTE: Needed to maintain backwards compatibility
1839  */
1840 int fb_get_options(char *name, char **option)
1841 {
1842         char *opt, *options = NULL;
1843         int retval = 0;
1844         int name_len = strlen(name), i;
1845
1846         if (name_len && ofonly && strncmp(name, "offb", 4))
1847                 retval = 1;
1848
1849         if (name_len && !retval) {
1850                 for (i = 0; i < FB_MAX; i++) {
1851                         if (video_options[i] == NULL)
1852                                 continue;
1853                         if (!video_options[i][0])
1854                                 continue;
1855                         opt = video_options[i];
1856                         if (!strncmp(name, opt, name_len) &&
1857                             opt[name_len] == ':')
1858                                 options = opt + name_len + 1;
1859                 }
1860         }
1861         if (options && !strncmp(options, "off", 3))
1862                 retval = 1;
1863
1864         if (option)
1865                 *option = options;
1866
1867         return retval;
1868 }
1869
1870 #ifndef MODULE
1871 /**
1872  *      video_setup - process command line options
1873  *      @options: string of options
1874  *
1875  *      Process command line options for frame buffer subsystem.
1876  *
1877  *      NOTE: This function is a __setup and __init function.
1878  *            It only stores the options.  Drivers have to call
1879  *            fb_get_options() as necessary.
1880  *
1881  *      Returns zero.
1882  *
1883  */
1884 static int __init video_setup(char *options)
1885 {
1886         int i, global = 0;
1887
1888         if (!options || !*options)
1889                 global = 1;
1890
1891         if (!global && !strncmp(options, "ofonly", 6)) {
1892                 ofonly = 1;
1893                 global = 1;
1894         }
1895
1896         if (!global && !strchr(options, ':')) {
1897                 fb_mode_option = options;
1898                 global = 1;
1899         }
1900
1901         if (!global) {
1902                 for (i = 0; i < FB_MAX; i++) {
1903                         if (video_options[i] == NULL) {
1904                                 video_options[i] = options;
1905                                 break;
1906                         }
1907
1908                 }
1909         }
1910
1911         return 1;
1912 }
1913 __setup("video=", video_setup);
1914 #endif
1915
1916     /*
1917      *  Visible symbols for modules
1918      */
1919
1920 EXPORT_SYMBOL(register_framebuffer);
1921 EXPORT_SYMBOL(unregister_framebuffer);
1922 EXPORT_SYMBOL(num_registered_fb);
1923 EXPORT_SYMBOL(registered_fb);
1924 EXPORT_SYMBOL(fb_show_logo);
1925 EXPORT_SYMBOL(fb_set_var);
1926 EXPORT_SYMBOL(fb_blank);
1927 EXPORT_SYMBOL(fb_pan_display);
1928 EXPORT_SYMBOL(fb_get_buffer_offset);
1929 EXPORT_SYMBOL(fb_set_suspend);
1930 EXPORT_SYMBOL(fb_get_options);
1931
1932 MODULE_LICENSE("GPL");