drivers/video/fbdev/core/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 #include <linux/fbcon.h>
  36 #include <linux/mem_encrypt.h>
  37 #include <linux/pci.h>
  38
  39 #include <asm/fb.h>
  40
  41
  42     /*
  43      *  Frame buffer device initialization and setup routines
  44      */
  45
  46 #define FBPIXMAPSIZE    (1024 * 8)
  47
  48 static DEFINE_MUTEX(registration_lock);
  49
  50 struct fb_info *registered_fb[FB_MAX] __read_mostly;
  51 EXPORT_SYMBOL(registered_fb);
  52
  53 int num_registered_fb __read_mostly;
  54 EXPORT_SYMBOL(num_registered_fb);
  55
  56 bool fb_center_logo __read_mostly;
  57 EXPORT_SYMBOL(fb_center_logo);
  58
  59 static struct fb_info *get_fb_info(unsigned int idx)
  60 {
  61         struct fb_info *fb_info;
  62
  63         if (idx >= FB_MAX)
  64                 return ERR_PTR(-ENODEV);
  65
  66         mutex_lock(&registration_lock);
  67         fb_info = registered_fb[idx];
  68         if (fb_info)
  69                 atomic_inc(&fb_info->count);
  70         mutex_unlock(&registration_lock);
  71
  72         return fb_info;
  73 }
  74
  75 static void put_fb_info(struct fb_info *fb_info)
  76 {
  77         if (!atomic_dec_and_test(&fb_info->count))
  78                 return;
  79         if (fb_info->fbops->fb_destroy)
  80                 fb_info->fbops->fb_destroy(fb_info);
  81 }
  82
  83 int lock_fb_info(struct fb_info *info)
  84 {
  85         mutex_lock(&info->lock);
  86         if (!info->fbops) {
  87                 mutex_unlock(&info->lock);
  88                 return 0;
  89         }
  90         return 1;
  91 }
  92 EXPORT_SYMBOL(lock_fb_info);
  93
  94 /*
  95  * Helpers
  96  */
  97
  98 int fb_get_color_depth(struct fb_var_screeninfo *var,
  99                        struct fb_fix_screeninfo *fix)
 100 {
 101         int depth = 0;
 102
 103         if (fix->visual == FB_VISUAL_MONO01 ||
 104             fix->visual == FB_VISUAL_MONO10)
 105                 depth = 1;
 106         else {
 107                 if (var->green.length == var->blue.length &&
 108                     var->green.length == var->red.length &&
 109                     var->green.offset == var->blue.offset &&
 110                     var->green.offset == var->red.offset)
 111                         depth = var->green.length;
 112                 else
 113                         depth = var->green.length + var->red.length +
 114                                 var->blue.length;
 115         }
 116
 117         return depth;
 118 }
 119 EXPORT_SYMBOL(fb_get_color_depth);
 120
 121 /*
 122  * Data padding functions.
 123  */
 124 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
 125 {
 126         __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
 127 }
 128 EXPORT_SYMBOL(fb_pad_aligned_buffer);
 129
 130 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
 131                                 u32 shift_high, u32 shift_low, u32 mod)
 132 {
 133         u8 mask = (u8) (0xfff << shift_high), tmp;
 134         int i, j;
 135
 136         for (i = height; i--; ) {
 137                 for (j = 0; j < idx; j++) {
 138                         tmp = dst[j];
 139                         tmp &= mask;
 140                         tmp |= *src >> shift_low;
 141                         dst[j] = tmp;
 142                         tmp = *src << shift_high;
 143                         dst[j+1] = tmp;
 144                         src++;
 145                 }
 146                 tmp = dst[idx];
 147                 tmp &= mask;
 148                 tmp |= *src >> shift_low;
 149                 dst[idx] = tmp;
 150                 if (shift_high < mod) {
 151                         tmp = *src << shift_high;
 152                         dst[idx+1] = tmp;
 153                 }
 154                 src++;
 155                 dst += d_pitch;
 156         }
 157 }
 158 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
 159
 160 /*
 161  * we need to lock this section since fb_cursor
 162  * may use fb_imageblit()
 163  */
 164 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
 165 {
 166         u32 align = buf->buf_align - 1, offset;
 167         char *addr = buf->addr;
 168
 169         /* If IO mapped, we need to sync before access, no sharing of
 170          * the pixmap is done
 171          */
 172         if (buf->flags & FB_PIXMAP_IO) {
 173                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 174                         info->fbops->fb_sync(info);
 175                 return addr;
 176         }
 177
 178         /* See if we fit in the remaining pixmap space */
 179         offset = buf->offset + align;
 180         offset &= ~align;
 181         if (offset + size > buf->size) {
 182                 /* We do not fit. In order to be able to re-use the buffer,
 183                  * we must ensure no asynchronous DMA'ing or whatever operation
 184                  * is in progress, we sync for that.
 185                  */
 186                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 187                         info->fbops->fb_sync(info);
 188                 offset = 0;
 189         }
 190         buf->offset = offset + size;
 191         addr += offset;
 192
 193         return addr;
 194 }
 195 EXPORT_SYMBOL(fb_get_buffer_offset);
 196
 197 #ifdef CONFIG_LOGO
 198
 199 static inline unsigned safe_shift(unsigned d, int n)
 200 {
 201         return n < 0 ? d >> -n : d << n;
 202 }
 203
 204 static void fb_set_logocmap(struct fb_info *info,
 205                                    const struct linux_logo *logo)
 206 {
 207         struct fb_cmap palette_cmap;
 208         u16 palette_green[16];
 209         u16 palette_blue[16];
 210         u16 palette_red[16];
 211         int i, j, n;
 212         const unsigned char *clut = logo->clut;
 213
 214         palette_cmap.start = 0;
 215         palette_cmap.len = 16;
 216         palette_cmap.red = palette_red;
 217         palette_cmap.green = palette_green;
 218         palette_cmap.blue = palette_blue;
 219         palette_cmap.transp = NULL;
 220
 221         for (i = 0; i < logo->clutsize; i += n) {
 222                 n = logo->clutsize - i;
 223                 /* palette_cmap provides space for only 16 colors at once */
 224                 if (n > 16)
 225                         n = 16;
 226                 palette_cmap.start = 32 + i;
 227                 palette_cmap.len = n;
 228                 for (j = 0; j < n; ++j) {
 229                         palette_cmap.red[j] = clut[0] << 8 | clut[0];
 230                         palette_cmap.green[j] = clut[1] << 8 | clut[1];
 231                         palette_cmap.blue[j] = clut[2] << 8 | clut[2];
 232                         clut += 3;
 233                 }
 234                 fb_set_cmap(&palette_cmap, info);
 235         }
 236 }
 237
 238 static void  fb_set_logo_truepalette(struct fb_info *info,
 239                                             const struct linux_logo *logo,
 240                                             u32 *palette)
 241 {
 242         static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
 243         unsigned char redmask, greenmask, bluemask;
 244         int redshift, greenshift, blueshift;
 245         int i;
 246         const unsigned char *clut = logo->clut;
 247
 248         /*
 249          * We have to create a temporary palette since console palette is only
 250          * 16 colors long.
 251          */
 252         /* Bug: Doesn't obey msb_right ... (who needs that?) */
 253         redmask   = mask[info->var.red.length   < 8 ? info->var.red.length   : 8];
 254         greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
 255         bluemask  = mask[info->var.blue.length  < 8 ? info->var.blue.length  : 8];
 256         redshift   = info->var.red.offset   - (8 - info->var.red.length);
 257         greenshift = info->var.green.offset - (8 - info->var.green.length);
 258         blueshift  = info->var.blue.offset  - (8 - info->var.blue.length);
 259
 260         for ( i = 0; i < logo->clutsize; i++) {
 261                 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
 262                                  safe_shift((clut[1] & greenmask), greenshift) |
 263                                  safe_shift((clut[2] & bluemask), blueshift));
 264                 clut += 3;
 265         }
 266 }
 267
 268 static void fb_set_logo_directpalette(struct fb_info *info,
 269                                              const struct linux_logo *logo,
 270                                              u32 *palette)
 271 {
 272         int redshift, greenshift, blueshift;
 273         int i;
 274
 275         redshift = info->var.red.offset;
 276         greenshift = info->var.green.offset;
 277         blueshift = info->var.blue.offset;
 278
 279         for (i = 32; i < 32 + logo->clutsize; i++)
 280                 palette[i] = i << redshift | i << greenshift | i << blueshift;
 281 }
 282
 283 static void fb_set_logo(struct fb_info *info,
 284                                const struct linux_logo *logo, u8 *dst,
 285                                int depth)
 286 {
 287         int i, j, k;
 288         const u8 *src = logo->data;
 289         u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
 290         u8 fg = 1, d;
 291
 292         switch (fb_get_color_depth(&info->var, &info->fix)) {
 293         case 1:
 294                 fg = 1;
 295                 break;
 296         case 2:
 297                 fg = 3;
 298                 break;
 299         default:
 300                 fg = 7;
 301                 break;
 302         }
 303
 304         if (info->fix.visual == FB_VISUAL_MONO01 ||
 305             info->fix.visual == FB_VISUAL_MONO10)
 306                 fg = ~((u8) (0xfff << info->var.green.length));
 307
 308         switch (depth) {
 309         case 4:
 310                 for (i = 0; i < logo->height; i++)
 311                         for (j = 0; j < logo->width; src++) {
 312                                 *dst++ = *src >> 4;
 313                                 j++;
 314                                 if (j < logo->width) {
 315                                         *dst++ = *src & 0x0f;
 316                                         j++;
 317                                 }
 318                         }
 319                 break;
 320         case 1:
 321                 for (i = 0; i < logo->height; i++) {
 322                         for (j = 0; j < logo->width; src++) {
 323                                 d = *src ^ xor;
 324                                 for (k = 7; k >= 0 && j < logo->width; k--) {
 325                                         *dst++ = ((d >> k) & 1) ? fg : 0;
 326                                         j++;
 327                                 }
 328                         }
 329                 }
 330                 break;
 331         }
 332 }
 333
 334 /*
 335  * Three (3) kinds of logo maps exist.  linux_logo_clut224 (>16 colors),
 336  * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors).  Depending on
 337  * the visual format and color depth of the framebuffer, the DAC, the
 338  * pseudo_palette, and the logo data will be adjusted accordingly.
 339  *
 340  * Case 1 - linux_logo_clut224:
 341  * Color exceeds the number of console colors (16), thus we set the hardware DAC
 342  * using fb_set_cmap() appropriately.  The "needs_cmapreset"  flag will be set.
 343  *
 344  * For visuals that require color info from the pseudo_palette, we also construct
 345  * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
 346  * will be set.
 347  *
 348  * Case 2 - linux_logo_vga16:
 349  * The number of colors just matches the console colors, thus there is no need
 350  * to set the DAC or the pseudo_palette.  However, the bitmap is packed, ie,
 351  * each byte contains color information for two pixels (upper and lower nibble).
 352  * To be consistent with fb_imageblit() usage, we therefore separate the two
 353  * nibbles into separate bytes. The "depth" flag will be set to 4.
 354  *
 355  * Case 3 - linux_logo_mono:
 356  * This is similar with Case 2.  Each byte contains information for 8 pixels.
 357  * We isolate each bit and expand each into a byte. The "depth" flag will
 358  * be set to 1.
 359  */
 360 static struct logo_data {
 361         int depth;
 362         int needs_directpalette;
 363         int needs_truepalette;
 364         int needs_cmapreset;
 365         const struct linux_logo *logo;
 366 } fb_logo __read_mostly;
 367
 368 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
 369 {
 370         u32 size = width * height, i;
 371
 372         out += size - 1;
 373
 374         for (i = size; i--; )
 375                 *out-- = *in++;
 376 }
 377
 378 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
 379 {
 380         int i, j, h = height - 1;
 381
 382         for (i = 0; i < height; i++)
 383                 for (j = 0; j < width; j++)
 384                                 out[height * j + h - i] = *in++;
 385 }
 386
 387 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
 388 {
 389         int i, j, w = width - 1;
 390
 391         for (i = 0; i < height; i++)
 392                 for (j = 0; j < width; j++)
 393                         out[height * (w - j) + i] = *in++;
 394 }
 395
 396 static void fb_rotate_logo(struct fb_info *info, u8 *dst,
 397                            struct fb_image *image, int rotate)
 398 {
 399         u32 tmp;
 400
 401         if (rotate == FB_ROTATE_UD) {
 402                 fb_rotate_logo_ud(image->data, dst, image->width,
 403                                   image->height);
 404                 image->dx = info->var.xres - image->width - image->dx;
 405                 image->dy = info->var.yres - image->height - image->dy;
 406         } else if (rotate == FB_ROTATE_CW) {
 407                 fb_rotate_logo_cw(image->data, dst, image->width,
 408                                   image->height);
 409                 tmp = image->width;
 410                 image->width = image->height;
 411                 image->height = tmp;
 412                 tmp = image->dy;
 413                 image->dy = image->dx;
 414                 image->dx = info->var.xres - image->width - tmp;
 415         } else if (rotate == FB_ROTATE_CCW) {
 416                 fb_rotate_logo_ccw(image->data, dst, image->width,
 417                                    image->height);
 418                 tmp = image->width;
 419                 image->width = image->height;
 420                 image->height = tmp;
 421                 tmp = image->dx;
 422                 image->dx = image->dy;
 423                 image->dy = info->var.yres - image->height - tmp;
 424         }
 425
 426         image->data = dst;
 427 }
 428
 429 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
 430                             int rotate, unsigned int num)
 431 {
 432         unsigned int x;
 433
 434         if (rotate == FB_ROTATE_UR) {
 435                 for (x = 0;
 436                      x < num && image->dx + image->width <= info->var.xres;
 437                      x++) {
 438                         info->fbops->fb_imageblit(info, image);
 439                         image->dx += image->width + 8;
 440                 }
 441         } else if (rotate == FB_ROTATE_UD) {
 442                 u32 dx = image->dx;
 443
 444                 for (x = 0; x < num && image->dx <= dx; x++) {
 445                         info->fbops->fb_imageblit(info, image);
 446                         image->dx -= image->width + 8;
 447                 }
 448         } else if (rotate == FB_ROTATE_CW) {
 449                 for (x = 0;
 450                      x < num && image->dy + image->height <= info->var.yres;
 451                      x++) {
 452                         info->fbops->fb_imageblit(info, image);
 453                         image->dy += image->height + 8;
 454                 }
 455         } else if (rotate == FB_ROTATE_CCW) {
 456                 u32 dy = image->dy;
 457
 458                 for (x = 0; x < num && image->dy <= dy; x++) {
 459                         info->fbops->fb_imageblit(info, image);
 460                         image->dy -= image->height + 8;
 461                 }
 462         }
 463 }
 464
 465 static int fb_show_logo_line(struct fb_info *info, int rotate,
 466                              const struct linux_logo *logo, int y,
 467                              unsigned int n)
 468 {
 469         u32 *palette = NULL, *saved_pseudo_palette = NULL;
 470         unsigned char *logo_new = NULL, *logo_rotate = NULL;
 471         struct fb_image image;
 472
 473         /* Return if the frame buffer is not mapped or suspended */
 474         if (logo == NULL || info->state != FBINFO_STATE_RUNNING ||
 475             info->fbops->owner)
 476                 return 0;
 477
 478         image.depth = 8;
 479         image.data = logo->data;
 480
 481         if (fb_logo.needs_cmapreset)
 482                 fb_set_logocmap(info, logo);
 483
 484         if (fb_logo.needs_truepalette ||
 485             fb_logo.needs_directpalette) {
 486                 palette = kmalloc(256 * 4, GFP_KERNEL);
 487                 if (palette == NULL)
 488                         return 0;
 489
 490                 if (fb_logo.needs_truepalette)
 491                         fb_set_logo_truepalette(info, logo, palette);
 492                 else
 493                         fb_set_logo_directpalette(info, logo, palette);
 494
 495                 saved_pseudo_palette = info->pseudo_palette;
 496                 info->pseudo_palette = palette;
 497         }
 498
 499         if (fb_logo.depth <= 4) {
 500                 logo_new = kmalloc_array(logo->width, logo->height,
 501                                          GFP_KERNEL);
 502                 if (logo_new == NULL) {
 503                         kfree(palette);
 504                         if (saved_pseudo_palette)
 505                                 info->pseudo_palette = saved_pseudo_palette;
 506                         return 0;
 507                 }
 508                 image.data = logo_new;
 509                 fb_set_logo(info, logo, logo_new, fb_logo.depth);
 510         }
 511
 512         if (fb_center_logo) {
 513                 int xres = info->var.xres;
 514                 int yres = info->var.yres;
 515
 516                 if (rotate == FB_ROTATE_CW || rotate == FB_ROTATE_CCW) {
 517                         xres = info->var.yres;
 518                         yres = info->var.xres;
 519                 }
 520
 521                 while (n && (n * (logo->width + 8) - 8 > xres))
 522                         --n;
 523                 image.dx = (xres - n * (logo->width + 8) - 8) / 2;
 524                 image.dy = y ?: (yres - logo->height) / 2;
 525         } else {
 526                 image.dx = 0;
 527                 image.dy = y;
 528         }
 529
 530         image.width = logo->width;
 531         image.height = logo->height;
 532
 533         if (rotate) {
 534                 logo_rotate = kmalloc_array(logo->width, logo->height,
 535                                             GFP_KERNEL);
 536                 if (logo_rotate)
 537                         fb_rotate_logo(info, logo_rotate, &image, rotate);
 538         }
 539
 540         fb_do_show_logo(info, &image, rotate, n);
 541
 542         kfree(palette);
 543         if (saved_pseudo_palette != NULL)
 544                 info->pseudo_palette = saved_pseudo_palette;
 545         kfree(logo_new);
 546         kfree(logo_rotate);
 547         return image.dy + logo->height;
 548 }
 549
 550
 551 #ifdef CONFIG_FB_LOGO_EXTRA
 552
 553 #define FB_LOGO_EX_NUM_MAX 10
 554 static struct logo_data_extra {
 555         const struct linux_logo *logo;
 556         unsigned int n;
 557 } fb_logo_ex[FB_LOGO_EX_NUM_MAX];
 558 static unsigned int fb_logo_ex_num;
 559
 560 void fb_append_extra_logo(const struct linux_logo *logo, unsigned int n)
 561 {
 562         if (!n || fb_logo_ex_num == FB_LOGO_EX_NUM_MAX)
 563                 return;
 564
 565         fb_logo_ex[fb_logo_ex_num].logo = logo;
 566         fb_logo_ex[fb_logo_ex_num].n = n;
 567         fb_logo_ex_num++;
 568 }
 569
 570 static int fb_prepare_extra_logos(struct fb_info *info, unsigned int height,
 571                                   unsigned int yres)
 572 {
 573         unsigned int i;
 574
 575         /* FIXME: logo_ex supports only truecolor fb. */
 576         if (info->fix.visual != FB_VISUAL_TRUECOLOR)
 577                 fb_logo_ex_num = 0;
 578
 579         for (i = 0; i < fb_logo_ex_num; i++) {
 580                 if (fb_logo_ex[i].logo->type != fb_logo.logo->type) {
 581                         fb_logo_ex[i].logo = NULL;
 582                         continue;
 583                 }
 584                 height += fb_logo_ex[i].logo->height;
 585                 if (height > yres) {
 586                         height -= fb_logo_ex[i].logo->height;
 587                         fb_logo_ex_num = i;
 588                         break;
 589                 }
 590         }
 591         return height;
 592 }
 593
 594 static int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
 595 {
 596         unsigned int i;
 597
 598         for (i = 0; i < fb_logo_ex_num; i++)
 599                 y = fb_show_logo_line(info, rotate,
 600                                       fb_logo_ex[i].logo, y, fb_logo_ex[i].n);
 601
 602         return y;
 603 }
 604
 605 #else /* !CONFIG_FB_LOGO_EXTRA */
 606
 607 static inline int fb_prepare_extra_logos(struct fb_info *info,
 608                                          unsigned int height,
 609                                          unsigned int yres)
 610 {
 611         return height;
 612 }
 613
 614 static inline int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
 615 {
 616         return y;
 617 }
 618
 619 #endif /* CONFIG_FB_LOGO_EXTRA */
 620
 621
 622 int fb_prepare_logo(struct fb_info *info, int rotate)
 623 {
 624         int depth = fb_get_color_depth(&info->var, &info->fix);
 625         unsigned int yres;
 626         int height;
 627
 628         memset(&fb_logo, 0, sizeof(struct logo_data));
 629
 630         if (info->flags & FBINFO_MISC_TILEBLITTING ||
 631             info->fbops->owner)
 632                 return 0;
 633
 634         if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
 635                 depth = info->var.blue.length;
 636                 if (info->var.red.length < depth)
 637                         depth = info->var.red.length;
 638                 if (info->var.green.length < depth)
 639                         depth = info->var.green.length;
 640         }
 641
 642         if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) {
 643                 /* assume console colormap */
 644                 depth = 4;
 645         }
 646
 647         /* Return if no suitable logo was found */
 648         fb_logo.logo = fb_find_logo(depth);
 649
 650         if (!fb_logo.logo) {
 651                 return 0;
 652         }
 653
 654         if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
 655                 yres = info->var.yres;
 656         else
 657                 yres = info->var.xres;
 658
 659         if (fb_logo.logo->height > yres) {
 660                 fb_logo.logo = NULL;
 661                 return 0;
 662         }
 663
 664         /* What depth we asked for might be different from what we get */
 665         if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
 666                 fb_logo.depth = 8;
 667         else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
 668                 fb_logo.depth = 4;
 669         else
 670                 fb_logo.depth = 1;
 671
 672
 673         if (fb_logo.depth > 4 && depth > 4) {
 674                 switch (info->fix.visual) {
 675                 case FB_VISUAL_TRUECOLOR:
 676                         fb_logo.needs_truepalette = 1;
 677                         break;
 678                 case FB_VISUAL_DIRECTCOLOR:
 679                         fb_logo.needs_directpalette = 1;
 680                         fb_logo.needs_cmapreset = 1;
 681                         break;
 682                 case FB_VISUAL_PSEUDOCOLOR:
 683                         fb_logo.needs_cmapreset = 1;
 684                         break;
 685                 }
 686         }
 687
 688         height = fb_logo.logo->height;
 689         if (fb_center_logo)
 690                 height += (yres - fb_logo.logo->height) / 2;
 691
 692         return fb_prepare_extra_logos(info, height, yres);
 693 }
 694
 695 int fb_show_logo(struct fb_info *info, int rotate)
 696 {
 697         int y;
 698
 699         y = fb_show_logo_line(info, rotate, fb_logo.logo, 0,
 700                               num_online_cpus());
 701         y = fb_show_extra_logos(info, y, rotate);
 702
 703         return y;
 704 }
 705 #else
 706 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
 707 int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
 708 #endif /* CONFIG_LOGO */
 709 EXPORT_SYMBOL(fb_prepare_logo);
 710 EXPORT_SYMBOL(fb_show_logo);
 711
 712 static void *fb_seq_start(struct seq_file *m, loff_t *pos)
 713 {
 714         mutex_lock(&registration_lock);
 715         return (*pos < FB_MAX) ? pos : NULL;
 716 }
 717
 718 static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos)
 719 {
 720         (*pos)++;
 721         return (*pos < FB_MAX) ? pos : NULL;
 722 }
 723
 724 static void fb_seq_stop(struct seq_file *m, void *v)
 725 {
 726         mutex_unlock(&registration_lock);
 727 }
 728
 729 static int fb_seq_show(struct seq_file *m, void *v)
 730 {
 731         int i = *(loff_t *)v;
 732         struct fb_info *fi = registered_fb[i];
 733
 734         if (fi)
 735                 seq_printf(m, "%d %s\n", fi->node, fi->fix.id);
 736         return 0;
 737 }
 738
 739 static const struct seq_operations proc_fb_seq_ops = {
 740         .start  = fb_seq_start,
 741         .next   = fb_seq_next,
 742         .stop   = fb_seq_stop,
 743         .show   = fb_seq_show,
 744 };
 745
 746 /*
 747  * We hold a reference to the fb_info in file->private_data,
 748  * but if the current registered fb has changed, we don't
 749  * actually want to use it.
 750  *
 751  * So look up the fb_info using the inode minor number,
 752  * and just verify it against the reference we have.
 753  */
 754 static struct fb_info *file_fb_info(struct file *file)
 755 {
 756         struct inode *inode = file_inode(file);
 757         int fbidx = iminor(inode);
 758         struct fb_info *info = registered_fb[fbidx];
 759
 760         if (info != file->private_data)
 761                 info = NULL;
 762         return info;
 763 }
 764
 765 static ssize_t
 766 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 767 {
 768         unsigned long p = *ppos;
 769         struct fb_info *info = file_fb_info(file);
 770         u8 *buffer, *dst;
 771         u8 __iomem *src;
 772         int c, cnt = 0, err = 0;
 773         unsigned long total_size;
 774
 775         if (!info || ! info->screen_base)
 776                 return -ENODEV;
 777
 778         if (info->state != FBINFO_STATE_RUNNING)
 779                 return -EPERM;
 780
 781         if (info->fbops->fb_read)
 782                 return info->fbops->fb_read(info, buf, count, ppos);
 783
 784         total_size = info->screen_size;
 785
 786         if (total_size == 0)
 787                 total_size = info->fix.smem_len;
 788
 789         if (p >= total_size)
 790                 return 0;
 791
 792         if (count >= total_size)
 793                 count = total_size;
 794
 795         if (count + p > total_size)
 796                 count = total_size - p;
 797
 798         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 799                          GFP_KERNEL);
 800         if (!buffer)
 801                 return -ENOMEM;
 802
 803         src = (u8 __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                 dst = buffer;
 811                 fb_memcpy_fromfb(dst, src, c);
 812                 dst += c;
 813                 src += c;
 814
 815                 if (copy_to_user(buf, buffer, c)) {
 816                         err = -EFAULT;
 817                         break;
 818                 }
 819                 *ppos += c;
 820                 buf += c;
 821                 cnt += c;
 822                 count -= c;
 823         }
 824
 825         kfree(buffer);
 826
 827         return (err) ? err : cnt;
 828 }
 829
 830 static ssize_t
 831 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 832 {
 833         unsigned long p = *ppos;
 834         struct fb_info *info = file_fb_info(file);
 835         u8 *buffer, *src;
 836         u8 __iomem *dst;
 837         int c, cnt = 0, err = 0;
 838         unsigned long total_size;
 839
 840         if (!info || !info->screen_base)
 841                 return -ENODEV;
 842
 843         if (info->state != FBINFO_STATE_RUNNING)
 844                 return -EPERM;
 845
 846         if (info->fbops->fb_write)
 847                 return info->fbops->fb_write(info, buf, count, ppos);
 848
 849         total_size = info->screen_size;
 850
 851         if (total_size == 0)
 852                 total_size = info->fix.smem_len;
 853
 854         if (p > total_size)
 855                 return -EFBIG;
 856
 857         if (count > total_size) {
 858                 err = -EFBIG;
 859                 count = total_size;
 860         }
 861
 862         if (count + p > total_size) {
 863                 if (!err)
 864                         err = -ENOSPC;
 865
 866                 count = total_size - p;
 867         }
 868
 869         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 870                          GFP_KERNEL);
 871         if (!buffer)
 872                 return -ENOMEM;
 873
 874         dst = (u8 __iomem *) (info->screen_base + p);
 875
 876         if (info->fbops->fb_sync)
 877                 info->fbops->fb_sync(info);
 878
 879         while (count) {
 880                 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 881                 src = buffer;
 882
 883                 if (copy_from_user(src, buf, c)) {
 884                         err = -EFAULT;
 885                         break;
 886                 }
 887
 888                 fb_memcpy_tofb(dst, src, c);
 889                 dst += c;
 890                 src += c;
 891                 *ppos += c;
 892                 buf += c;
 893                 cnt += c;
 894                 count -= c;
 895         }
 896
 897         kfree(buffer);
 898
 899         return (cnt) ? cnt : err;
 900 }
 901
 902 int
 903 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
 904 {
 905         struct fb_fix_screeninfo *fix = &info->fix;
 906         unsigned int yres = info->var.yres;
 907         int err = 0;
 908
 909         if (var->yoffset > 0) {
 910                 if (var->vmode & FB_VMODE_YWRAP) {
 911                         if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
 912                                 err = -EINVAL;
 913                         else
 914                                 yres = 0;
 915                 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
 916                         err = -EINVAL;
 917         }
 918
 919         if (var->xoffset > 0 && (!fix->xpanstep ||
 920                                  (var->xoffset % fix->xpanstep)))
 921                 err = -EINVAL;
 922
 923         if (err || !info->fbops->fb_pan_display ||
 924             var->yoffset > info->var.yres_virtual - yres ||
 925             var->xoffset > info->var.xres_virtual - info->var.xres)
 926                 return -EINVAL;
 927
 928         if ((err = info->fbops->fb_pan_display(var, info)))
 929                 return err;
 930         info->var.xoffset = var->xoffset;
 931         info->var.yoffset = var->yoffset;
 932         if (var->vmode & FB_VMODE_YWRAP)
 933                 info->var.vmode |= FB_VMODE_YWRAP;
 934         else
 935                 info->var.vmode &= ~FB_VMODE_YWRAP;
 936         return 0;
 937 }
 938 EXPORT_SYMBOL(fb_pan_display);
 939
 940 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var,
 941                          u32 activate)
 942 {
 943         struct fb_event event;
 944         struct fb_blit_caps caps, fbcaps;
 945         int err = 0;
 946
 947         memset(&caps, 0, sizeof(caps));
 948         memset(&fbcaps, 0, sizeof(fbcaps));
 949         caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0;
 950         event.info = info;
 951         event.data = &caps;
 952         fb_notifier_call_chain(FB_EVENT_GET_REQ, &event);
 953         info->fbops->fb_get_caps(info, &fbcaps, var);
 954
 955         if (((fbcaps.x ^ caps.x) & caps.x) ||
 956             ((fbcaps.y ^ caps.y) & caps.y) ||
 957             (fbcaps.len < caps.len))
 958                 err = -EINVAL;
 959
 960         return err;
 961 }
 962
 963 int
 964 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
 965 {
 966         int flags = info->flags;
 967         int ret = 0;
 968
 969         if (var->activate & FB_ACTIVATE_INV_MODE) {
 970                 struct fb_videomode mode1, mode2;
 971
 972                 fb_var_to_videomode(&mode1, var);
 973                 fb_var_to_videomode(&mode2, &info->var);
 974                 /* make sure we don't delete the videomode of current var */
 975                 ret = fb_mode_is_equal(&mode1, &mode2);
 976
 977                 if (!ret) {
 978                     struct fb_event event;
 979
 980                     event.info = info;
 981                     event.data = &mode1;
 982                     ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event);
 983                 }
 984
 985                 if (!ret)
 986                     fb_delete_videomode(&mode1, &info->modelist);
 987
 988
 989                 ret = (ret) ? -EINVAL : 0;
 990                 goto done;
 991         }
 992
 993         if ((var->activate & FB_ACTIVATE_FORCE) ||
 994             memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
 995                 u32 activate = var->activate;
 996
 997                 /* When using FOURCC mode, make sure the red, green, blue and
 998                  * transp fields are set to 0.
 999                  */
1000                 if ((info->fix.capabilities & FB_CAP_FOURCC) &&
1001                     var->grayscale > 1) {
1002                         if (var->red.offset     || var->green.offset    ||
1003                             var->blue.offset    || var->transp.offset   ||
1004                             var->red.length     || var->green.length    ||
1005                             var->blue.length    || var->transp.length   ||
1006                             var->red.msb_right  || var->green.msb_right ||
1007                             var->blue.msb_right || var->transp.msb_right)
1008                                 return -EINVAL;
1009                 }
1010
1011                 if (!info->fbops->fb_check_var) {
1012                         *var = info->var;
1013                         goto done;
1014                 }
1015
1016                 ret = info->fbops->fb_check_var(var, info);
1017
1018                 if (ret)
1019                         goto done;
1020
1021                 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
1022                         struct fb_var_screeninfo old_var;
1023                         struct fb_videomode mode;
1024
1025                         if (info->fbops->fb_get_caps) {
1026                                 ret = fb_check_caps(info, var, activate);
1027
1028                                 if (ret)
1029                                         goto done;
1030                         }
1031
1032                         old_var = info->var;
1033                         info->var = *var;
1034
1035                         if (info->fbops->fb_set_par) {
1036                                 ret = info->fbops->fb_set_par(info);
1037
1038                                 if (ret) {
1039                                         info->var = old_var;
1040                                         printk(KERN_WARNING "detected "
1041                                                 "fb_set_par error, "
1042                                                 "error code: %d\n", ret);
1043                                         goto done;
1044                                 }
1045                         }
1046
1047                         fb_pan_display(info, &info->var);
1048                         fb_set_cmap(&info->cmap, info);
1049                         fb_var_to_videomode(&mode, &info->var);
1050
1051                         if (info->modelist.prev && info->modelist.next &&
1052                             !list_empty(&info->modelist))
1053                                 ret = fb_add_videomode(&mode, &info->modelist);
1054
1055                         if (!ret && (flags & FBINFO_MISC_USEREVENT)) {
1056                                 struct fb_event event;
1057                                 int evnt = (activate & FB_ACTIVATE_ALL) ?
1058                                         FB_EVENT_MODE_CHANGE_ALL :
1059                                         FB_EVENT_MODE_CHANGE;
1060
1061                                 info->flags &= ~FBINFO_MISC_USEREVENT;
1062                                 event.info = info;
1063                                 event.data = &mode;
1064                                 fb_notifier_call_chain(evnt, &event);
1065                         }
1066                 }
1067         }
1068
1069  done:
1070         return ret;
1071 }
1072 EXPORT_SYMBOL(fb_set_var);
1073
1074 int
1075 fb_blank(struct fb_info *info, int blank)
1076 {
1077         struct fb_event event;
1078         int ret = -EINVAL, early_ret;
1079
1080         if (blank > FB_BLANK_POWERDOWN)
1081                 blank = FB_BLANK_POWERDOWN;
1082
1083         event.info = info;
1084         event.data = &blank;
1085
1086         early_ret = fb_notifier_call_chain(FB_EARLY_EVENT_BLANK, &event);
1087
1088         if (info->fbops->fb_blank)
1089                 ret = info->fbops->fb_blank(blank, info);
1090
1091         if (!ret)
1092                 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
1093         else {
1094                 /*
1095                  * if fb_blank is failed then revert effects of
1096                  * the early blank event.
1097                  */
1098                 if (!early_ret)
1099                         fb_notifier_call_chain(FB_R_EARLY_EVENT_BLANK, &event);
1100         }
1101
1102         return ret;
1103 }
1104 EXPORT_SYMBOL(fb_blank);
1105
1106 static long do_fb_ioctl(struct fb_info *info, unsigned int cmd,
1107                         unsigned long arg)
1108 {
1109         struct fb_ops *fb;
1110         struct fb_var_screeninfo var;
1111         struct fb_fix_screeninfo fix;
1112         struct fb_con2fbmap con2fb;
1113         struct fb_cmap cmap_from;
1114         struct fb_cmap_user cmap;
1115         struct fb_event event;
1116         void __user *argp = (void __user *)arg;
1117         long ret = 0;
1118
1119         switch (cmd) {
1120         case FBIOGET_VSCREENINFO:
1121                 if (!lock_fb_info(info))
1122                         return -ENODEV;
1123                 var = info->var;
1124                 unlock_fb_info(info);
1125
1126                 ret = copy_to_user(argp, &var, sizeof(var)) ? -EFAULT : 0;
1127                 break;
1128         case FBIOPUT_VSCREENINFO:
1129                 if (copy_from_user(&var, argp, sizeof(var)))
1130                         return -EFAULT;
1131                 console_lock();
1132                 if (!lock_fb_info(info)) {
1133                         console_unlock();
1134                         return -ENODEV;
1135                 }
1136                 info->flags |= FBINFO_MISC_USEREVENT;
1137                 ret = fb_set_var(info, &var);
1138                 info->flags &= ~FBINFO_MISC_USEREVENT;
1139                 unlock_fb_info(info);
1140                 console_unlock();
1141                 if (!ret && copy_to_user(argp, &var, sizeof(var)))
1142                         ret = -EFAULT;
1143                 break;
1144         case FBIOGET_FSCREENINFO:
1145                 if (!lock_fb_info(info))
1146                         return -ENODEV;
1147                 fix = info->fix;
1148                 if (info->flags & FBINFO_HIDE_SMEM_START)
1149                         fix.smem_start = 0;
1150                 unlock_fb_info(info);
1151
1152                 ret = copy_to_user(argp, &fix, sizeof(fix)) ? -EFAULT : 0;
1153                 break;
1154         case FBIOPUTCMAP:
1155                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1156                         return -EFAULT;
1157                 ret = fb_set_user_cmap(&cmap, info);
1158                 break;
1159         case FBIOGETCMAP:
1160                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1161                         return -EFAULT;
1162                 if (!lock_fb_info(info))
1163                         return -ENODEV;
1164                 cmap_from = info->cmap;
1165                 unlock_fb_info(info);
1166                 ret = fb_cmap_to_user(&cmap_from, &cmap);
1167                 break;
1168         case FBIOPAN_DISPLAY:
1169                 if (copy_from_user(&var, argp, sizeof(var)))
1170                         return -EFAULT;
1171                 console_lock();
1172                 if (!lock_fb_info(info)) {
1173                         console_unlock();
1174                         return -ENODEV;
1175                 }
1176                 ret = fb_pan_display(info, &var);
1177                 unlock_fb_info(info);
1178                 console_unlock();
1179                 if (ret == 0 && copy_to_user(argp, &var, sizeof(var)))
1180                         return -EFAULT;
1181                 break;
1182         case FBIO_CURSOR:
1183                 ret = -EINVAL;
1184                 break;
1185         case FBIOGET_CON2FBMAP:
1186                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1187                         return -EFAULT;
1188                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1189                         return -EINVAL;
1190                 con2fb.framebuffer = -1;
1191                 event.data = &con2fb;
1192                 if (!lock_fb_info(info))
1193                         return -ENODEV;
1194                 event.info = info;
1195                 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
1196                 unlock_fb_info(info);
1197                 ret = copy_to_user(argp, &con2fb, sizeof(con2fb)) ? -EFAULT : 0;
1198                 break;
1199         case FBIOPUT_CON2FBMAP:
1200                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1201                         return -EFAULT;
1202                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1203                         return -EINVAL;
1204                 if (con2fb.framebuffer >= FB_MAX)
1205                         return -EINVAL;
1206                 if (!registered_fb[con2fb.framebuffer])
1207                         request_module("fb%d", con2fb.framebuffer);
1208                 if (!registered_fb[con2fb.framebuffer]) {
1209                         ret = -EINVAL;
1210                         break;
1211                 }
1212                 event.data = &con2fb;
1213                 console_lock();
1214                 if (!lock_fb_info(info)) {
1215                         console_unlock();
1216                         return -ENODEV;
1217                 }
1218                 event.info = info;
1219                 ret = fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP, &event);
1220                 unlock_fb_info(info);
1221                 console_unlock();
1222                 break;
1223         case FBIOBLANK:
1224                 console_lock();
1225                 if (!lock_fb_info(info)) {
1226                         console_unlock();
1227                         return -ENODEV;
1228                 }
1229                 info->flags |= FBINFO_MISC_USEREVENT;
1230                 ret = fb_blank(info, arg);
1231                 info->flags &= ~FBINFO_MISC_USEREVENT;
1232                 unlock_fb_info(info);
1233                 console_unlock();
1234                 break;
1235         default:
1236                 if (!lock_fb_info(info))
1237                         return -ENODEV;
1238                 fb = info->fbops;
1239                 if (fb->fb_ioctl)
1240                         ret = fb->fb_ioctl(info, cmd, arg);
1241                 else
1242                         ret = -ENOTTY;
1243                 unlock_fb_info(info);
1244         }
1245         return ret;
1246 }
1247
1248 static long fb_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1249 {
1250         struct fb_info *info = file_fb_info(file);
1251
1252         if (!info)
1253                 return -ENODEV;
1254         return do_fb_ioctl(info, cmd, arg);
1255 }
1256
1257 #ifdef CONFIG_COMPAT
1258 struct fb_fix_screeninfo32 {
1259         char                    id[16];
1260         compat_caddr_t          smem_start;
1261         u32                     smem_len;
1262         u32                     type;
1263         u32                     type_aux;
1264         u32                     visual;
1265         u16                     xpanstep;
1266         u16                     ypanstep;
1267         u16                     ywrapstep;
1268         u32                     line_length;
1269         compat_caddr_t          mmio_start;
1270         u32                     mmio_len;
1271         u32                     accel;
1272         u16                     reserved[3];
1273 };
1274
1275 struct fb_cmap32 {
1276         u32                     start;
1277         u32                     len;
1278         compat_caddr_t  red;
1279         compat_caddr_t  green;
1280         compat_caddr_t  blue;
1281         compat_caddr_t  transp;
1282 };
1283
1284 static int fb_getput_cmap(struct fb_info *info, unsigned int cmd,
1285                           unsigned long arg)
1286 {
1287         struct fb_cmap_user __user *cmap;
1288         struct fb_cmap32 __user *cmap32;
1289         __u32 data;
1290         int err;
1291
1292         cmap = compat_alloc_user_space(sizeof(*cmap));
1293         cmap32 = compat_ptr(arg);
1294
1295         if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1296                 return -EFAULT;
1297
1298         if (get_user(data, &cmap32->red) ||
1299             put_user(compat_ptr(data), &cmap->red) ||
1300             get_user(data, &cmap32->green) ||
1301             put_user(compat_ptr(data), &cmap->green) ||
1302             get_user(data, &cmap32->blue) ||
1303             put_user(compat_ptr(data), &cmap->blue) ||
1304             get_user(data, &cmap32->transp) ||
1305             put_user(compat_ptr(data), &cmap->transp))
1306                 return -EFAULT;
1307
1308         err = do_fb_ioctl(info, cmd, (unsigned long) cmap);
1309
1310         if (!err) {
1311                 if (copy_in_user(&cmap32->start,
1312                                  &cmap->start,
1313                                  2 * sizeof(__u32)))
1314                         err = -EFAULT;
1315         }
1316         return err;
1317 }
1318
1319 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1320                                   struct fb_fix_screeninfo32 __user *fix32)
1321 {
1322         __u32 data;
1323         int err;
1324
1325         err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1326
1327         data = (__u32) (unsigned long) fix->smem_start;
1328         err |= put_user(data, &fix32->smem_start);
1329
1330         err |= put_user(fix->smem_len, &fix32->smem_len);
1331         err |= put_user(fix->type, &fix32->type);
1332         err |= put_user(fix->type_aux, &fix32->type_aux);
1333         err |= put_user(fix->visual, &fix32->visual);
1334         err |= put_user(fix->xpanstep, &fix32->xpanstep);
1335         err |= put_user(fix->ypanstep, &fix32->ypanstep);
1336         err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1337         err |= put_user(fix->line_length, &fix32->line_length);
1338
1339         data = (__u32) (unsigned long) fix->mmio_start;
1340         err |= put_user(data, &fix32->mmio_start);
1341
1342         err |= put_user(fix->mmio_len, &fix32->mmio_len);
1343         err |= put_user(fix->accel, &fix32->accel);
1344         err |= copy_to_user(fix32->reserved, fix->reserved,
1345                             sizeof(fix->reserved));
1346
1347         if (err)
1348                 return -EFAULT;
1349         return 0;
1350 }
1351
1352 static int fb_get_fscreeninfo(struct fb_info *info, unsigned int cmd,
1353                               unsigned long arg)
1354 {
1355         struct fb_fix_screeninfo fix;
1356
1357         if (!lock_fb_info(info))
1358                 return -ENODEV;
1359         fix = info->fix;
1360         if (info->flags & FBINFO_HIDE_SMEM_START)
1361                 fix.smem_start = 0;
1362         unlock_fb_info(info);
1363         return do_fscreeninfo_to_user(&fix, compat_ptr(arg));
1364 }
1365
1366 static long fb_compat_ioctl(struct file *file, unsigned int cmd,
1367                             unsigned long arg)
1368 {
1369         struct fb_info *info = file_fb_info(file);
1370         struct fb_ops *fb;
1371         long ret = -ENOIOCTLCMD;
1372
1373         if (!info)
1374                 return -ENODEV;
1375         fb = info->fbops;
1376         switch(cmd) {
1377         case FBIOGET_VSCREENINFO:
1378         case FBIOPUT_VSCREENINFO:
1379         case FBIOPAN_DISPLAY:
1380         case FBIOGET_CON2FBMAP:
1381         case FBIOPUT_CON2FBMAP:
1382                 arg = (unsigned long) compat_ptr(arg);
1383                 /* fall through */
1384         case FBIOBLANK:
1385                 ret = do_fb_ioctl(info, cmd, arg);
1386                 break;
1387
1388         case FBIOGET_FSCREENINFO:
1389                 ret = fb_get_fscreeninfo(info, cmd, arg);
1390                 break;
1391
1392         case FBIOGETCMAP:
1393         case FBIOPUTCMAP:
1394                 ret = fb_getput_cmap(info, cmd, arg);
1395                 break;
1396
1397         default:
1398                 if (fb->fb_compat_ioctl)
1399                         ret = fb->fb_compat_ioctl(info, cmd, arg);
1400                 break;
1401         }
1402         return ret;
1403 }
1404 #endif
1405
1406 static int
1407 fb_mmap(struct file *file, struct vm_area_struct * vma)
1408 {
1409         struct fb_info *info = file_fb_info(file);
1410         struct fb_ops *fb;
1411         unsigned long mmio_pgoff;
1412         unsigned long start;
1413         u32 len;
1414
1415         if (!info)
1416                 return -ENODEV;
1417         fb = info->fbops;
1418         if (!fb)
1419                 return -ENODEV;
1420         mutex_lock(&info->mm_lock);
1421         if (fb->fb_mmap) {
1422                 int res;
1423
1424                 /*
1425                  * The framebuffer needs to be accessed decrypted, be sure
1426                  * SME protection is removed ahead of the call
1427                  */
1428                 vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
1429                 res = fb->fb_mmap(info, vma);
1430                 mutex_unlock(&info->mm_lock);
1431                 return res;
1432         }
1433
1434         /*
1435          * Ugh. This can be either the frame buffer mapping, or
1436          * if pgoff points past it, the mmio mapping.
1437          */
1438         start = info->fix.smem_start;
1439         len = info->fix.smem_len;
1440         mmio_pgoff = PAGE_ALIGN((start & ~PAGE_MASK) + len) >> PAGE_SHIFT;
1441         if (vma->vm_pgoff >= mmio_pgoff) {
1442                 if (info->var.accel_flags) {
1443                         mutex_unlock(&info->mm_lock);
1444                         return -EINVAL;
1445                 }
1446
1447                 vma->vm_pgoff -= mmio_pgoff;
1448                 start = info->fix.mmio_start;
1449                 len = info->fix.mmio_len;
1450         }
1451         mutex_unlock(&info->mm_lock);
1452
1453         vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
1454         /*
1455          * The framebuffer needs to be accessed decrypted, be sure
1456          * SME protection is removed
1457          */
1458         vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
1459         fb_pgprotect(file, vma, start);
1460
1461         return vm_iomap_memory(vma, start, len);
1462 }
1463
1464 static int
1465 fb_open(struct inode *inode, struct file *file)
1466 __acquires(&info->lock)
1467 __releases(&info->lock)
1468 {
1469         int fbidx = iminor(inode);
1470         struct fb_info *info;
1471         int res = 0;
1472
1473         info = get_fb_info(fbidx);
1474         if (!info) {
1475                 request_module("fb%d", fbidx);
1476                 info = get_fb_info(fbidx);
1477                 if (!info)
1478                         return -ENODEV;
1479         }
1480         if (IS_ERR(info))
1481                 return PTR_ERR(info);
1482
1483         mutex_lock(&info->lock);
1484         if (!try_module_get(info->fbops->owner)) {
1485                 res = -ENODEV;
1486                 goto out;
1487         }
1488         file->private_data = info;
1489         if (info->fbops->fb_open) {
1490                 res = info->fbops->fb_open(info,1);
1491                 if (res)
1492                         module_put(info->fbops->owner);
1493         }
1494 #ifdef CONFIG_FB_DEFERRED_IO
1495         if (info->fbdefio)
1496                 fb_deferred_io_open(info, inode, file);
1497 #endif
1498 out:
1499         mutex_unlock(&info->lock);
1500         if (res)
1501                 put_fb_info(info);
1502         return res;
1503 }
1504
1505 static int
1506 fb_release(struct inode *inode, struct file *file)
1507 __acquires(&info->lock)
1508 __releases(&info->lock)
1509 {
1510         struct fb_info * const info = file->private_data;
1511
1512         mutex_lock(&info->lock);
1513         if (info->fbops->fb_release)
1514                 info->fbops->fb_release(info,1);
1515         module_put(info->fbops->owner);
1516         mutex_unlock(&info->lock);
1517         put_fb_info(info);
1518         return 0;
1519 }
1520
1521 #if defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && !defined(CONFIG_MMU)
1522 unsigned long get_fb_unmapped_area(struct file *filp,
1523                                    unsigned long addr, unsigned long len,
1524                                    unsigned long pgoff, unsigned long flags)
1525 {
1526         struct fb_info * const info = filp->private_data;
1527         unsigned long fb_size = PAGE_ALIGN(info->fix.smem_len);
1528
1529         if (pgoff > fb_size || len > fb_size - pgoff)
1530                 return -EINVAL;
1531
1532         return (unsigned long)info->screen_base + pgoff;
1533 }
1534 #endif
1535
1536 static const struct file_operations fb_fops = {
1537         .owner =        THIS_MODULE,
1538         .read =         fb_read,
1539         .write =        fb_write,
1540         .unlocked_ioctl = fb_ioctl,
1541 #ifdef CONFIG_COMPAT
1542         .compat_ioctl = fb_compat_ioctl,
1543 #endif
1544         .mmap =         fb_mmap,
1545         .open =         fb_open,
1546         .release =      fb_release,
1547 #if defined(HAVE_ARCH_FB_UNMAPPED_AREA) || \
1548         (defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && \
1549          !defined(CONFIG_MMU))
1550         .get_unmapped_area = get_fb_unmapped_area,
1551 #endif
1552 #ifdef CONFIG_FB_DEFERRED_IO
1553         .fsync =        fb_deferred_io_fsync,
1554 #endif
1555         .llseek =       default_llseek,
1556 };
1557
1558 struct class *fb_class;
1559 EXPORT_SYMBOL(fb_class);
1560
1561 static int fb_check_foreignness(struct fb_info *fi)
1562 {
1563         const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN;
1564
1565         fi->flags &= ~FBINFO_FOREIGN_ENDIAN;
1566
1567 #ifdef __BIG_ENDIAN
1568         fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH;
1569 #else
1570         fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0;
1571 #endif /* __BIG_ENDIAN */
1572
1573         if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) {
1574                 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to "
1575                        "support this framebuffer\n", fi->fix.id);
1576                 return -ENOSYS;
1577         } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) {
1578                 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to "
1579                        "support this framebuffer\n", fi->fix.id);
1580                 return -ENOSYS;
1581         }
1582
1583         return 0;
1584 }
1585
1586 static bool apertures_overlap(struct aperture *gen, struct aperture *hw)
1587 {
1588         /* is the generic aperture base the same as the HW one */
1589         if (gen->base == hw->base)
1590                 return true;
1591         /* is the generic aperture base inside the hw base->hw base+size */
1592         if (gen->base > hw->base && gen->base < hw->base + hw->size)
1593                 return true;
1594         return false;
1595 }
1596
1597 static bool fb_do_apertures_overlap(struct apertures_struct *gena,
1598                                     struct apertures_struct *hwa)
1599 {
1600         int i, j;
1601         if (!hwa || !gena)
1602                 return false;
1603
1604         for (i = 0; i < hwa->count; ++i) {
1605                 struct aperture *h = &hwa->ranges[i];
1606                 for (j = 0; j < gena->count; ++j) {
1607                         struct aperture *g = &gena->ranges[j];
1608                         printk(KERN_DEBUG "checking generic (%llx %llx) vs hw (%llx %llx)\n",
1609                                 (unsigned long long)g->base,
1610                                 (unsigned long long)g->size,
1611                                 (unsigned long long)h->base,
1612                                 (unsigned long long)h->size);
1613                         if (apertures_overlap(g, h))
1614                                 return true;
1615                 }
1616         }
1617
1618         return false;
1619 }
1620
1621 static int do_unregister_framebuffer(struct fb_info *fb_info);
1622
1623 #define VGA_FB_PHYS 0xA0000
1624 static int do_remove_conflicting_framebuffers(struct apertures_struct *a,
1625                                               const char *name, bool primary)
1626 {
1627         int i, ret;
1628
1629         /* check all firmware fbs and kick off if the base addr overlaps */
1630         for_each_registered_fb(i) {
1631                 struct apertures_struct *gen_aper;
1632
1633                 if (!(registered_fb[i]->flags & FBINFO_MISC_FIRMWARE))
1634                         continue;
1635
1636                 gen_aper = registered_fb[i]->apertures;
1637                 if (fb_do_apertures_overlap(gen_aper, a) ||
1638                         (primary && gen_aper && gen_aper->count &&
1639                          gen_aper->ranges[0].base == VGA_FB_PHYS)) {
1640
1641                         printk(KERN_INFO "fb%d: switching to %s from %s\n",
1642                                i, name, registered_fb[i]->fix.id);
1643                         ret = do_unregister_framebuffer(registered_fb[i]);
1644                         if (ret)
1645                                 return ret;
1646                 }
1647         }
1648
1649         return 0;
1650 }
1651
1652 static bool lockless_register_fb;
1653 module_param_named_unsafe(lockless_register_fb, lockless_register_fb, bool, 0400);
1654 MODULE_PARM_DESC(lockless_register_fb,
1655         "Lockless framebuffer registration for debugging [default=off]");
1656
1657 static int do_register_framebuffer(struct fb_info *fb_info)
1658 {
1659         int i, ret;
1660         struct fb_event event;
1661         struct fb_videomode mode;
1662
1663         if (fb_check_foreignness(fb_info))
1664                 return -ENOSYS;
1665
1666         ret = do_remove_conflicting_framebuffers(fb_info->apertures,
1667                                                  fb_info->fix.id,
1668                                                  fb_is_primary_device(fb_info));
1669         if (ret)
1670                 return ret;
1671
1672         if (num_registered_fb == FB_MAX)
1673                 return -ENXIO;
1674
1675         num_registered_fb++;
1676         for (i = 0 ; i < FB_MAX; i++)
1677                 if (!registered_fb[i])
1678                         break;
1679         fb_info->node = i;
1680         atomic_set(&fb_info->count, 1);
1681         mutex_init(&fb_info->lock);
1682         mutex_init(&fb_info->mm_lock);
1683
1684         fb_info->dev = device_create(fb_class, fb_info->device,
1685                                      MKDEV(FB_MAJOR, i), NULL, "fb%d", i);
1686         if (IS_ERR(fb_info->dev)) {
1687                 /* Not fatal */
1688                 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1689                 fb_info->dev = NULL;
1690         } else
1691                 fb_init_device(fb_info);
1692
1693         if (fb_info->pixmap.addr == NULL) {
1694                 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1695                 if (fb_info->pixmap.addr) {
1696                         fb_info->pixmap.size = FBPIXMAPSIZE;
1697                         fb_info->pixmap.buf_align = 1;
1698                         fb_info->pixmap.scan_align = 1;
1699                         fb_info->pixmap.access_align = 32;
1700                         fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1701                 }
1702         }
1703         fb_info->pixmap.offset = 0;
1704
1705         if (!fb_info->pixmap.blit_x)
1706                 fb_info->pixmap.blit_x = ~(u32)0;
1707
1708         if (!fb_info->pixmap.blit_y)
1709                 fb_info->pixmap.blit_y = ~(u32)0;
1710
1711         if (!fb_info->modelist.prev || !fb_info->modelist.next)
1712                 INIT_LIST_HEAD(&fb_info->modelist);
1713
1714         if (fb_info->skip_vt_switch)
1715                 pm_vt_switch_required(fb_info->dev, false);
1716         else
1717                 pm_vt_switch_required(fb_info->dev, true);
1718
1719         fb_var_to_videomode(&mode, &fb_info->var);
1720         fb_add_videomode(&mode, &fb_info->modelist);
1721         registered_fb[i] = fb_info;
1722
1723         event.info = fb_info;
1724         if (!lockless_register_fb)
1725                 console_lock();
1726         else
1727                 atomic_inc(&ignore_console_lock_warning);
1728         if (!lock_fb_info(fb_info)) {
1729                 ret = -ENODEV;
1730                 goto unlock_console;
1731         }
1732         ret = 0;
1733
1734         fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1735         unlock_fb_info(fb_info);
1736 unlock_console:
1737         if (!lockless_register_fb)
1738                 console_unlock();
1739         else
1740                 atomic_dec(&ignore_console_lock_warning);
1741         return ret;
1742 }
1743
1744 static int unbind_console(struct fb_info *fb_info)
1745 {
1746         struct fb_event event;
1747         int ret;
1748         int i = fb_info->node;
1749
1750         if (i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)
1751                 return -EINVAL;
1752
1753         console_lock();
1754         if (!lock_fb_info(fb_info)) {
1755                 console_unlock();
1756                 return -ENODEV;
1757         }
1758
1759         event.info = fb_info;
1760         ret = fb_notifier_call_chain(FB_EVENT_FB_UNBIND, &event);
1761         unlock_fb_info(fb_info);
1762         console_unlock();
1763
1764         return ret;
1765 }
1766
1767 static int __unlink_framebuffer(struct fb_info *fb_info);
1768
1769 static int do_unregister_framebuffer(struct fb_info *fb_info)
1770 {
1771         struct fb_event event;
1772         int ret;
1773
1774         ret = unbind_console(fb_info);
1775
1776         if (ret)
1777                 return -EINVAL;
1778
1779         pm_vt_switch_unregister(fb_info->dev);
1780
1781         __unlink_framebuffer(fb_info);
1782         if (fb_info->pixmap.addr &&
1783             (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1784                 kfree(fb_info->pixmap.addr);
1785         fb_destroy_modelist(&fb_info->modelist);
1786         registered_fb[fb_info->node] = NULL;
1787         num_registered_fb--;
1788         fb_cleanup_device(fb_info);
1789         event.info = fb_info;
1790         console_lock();
1791         fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1792         console_unlock();
1793
1794         /* this may free fb info */
1795         put_fb_info(fb_info);
1796         return 0;
1797 }
1798
1799 static int __unlink_framebuffer(struct fb_info *fb_info)
1800 {
1801         int i;
1802
1803         i = fb_info->node;
1804         if (i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)
1805                 return -EINVAL;
1806
1807         if (fb_info->dev) {
1808                 device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1809                 fb_info->dev = NULL;
1810         }
1811
1812         return 0;
1813 }
1814
1815 int unlink_framebuffer(struct fb_info *fb_info)
1816 {
1817         int ret;
1818
1819         ret = __unlink_framebuffer(fb_info);
1820         if (ret)
1821                 return ret;
1822
1823         unbind_console(fb_info);
1824
1825         return 0;
1826 }
1827 EXPORT_SYMBOL(unlink_framebuffer);
1828
1829 /**
1830  * remove_conflicting_framebuffers - remove firmware-configured framebuffers
1831  * @a: memory range, users of which are to be removed
1832  * @name: requesting driver name
1833  * @primary: also kick vga16fb if present
1834  *
1835  * This function removes framebuffer devices (initialized by firmware/bootloader)
1836  * which use memory range described by @a. If @a is NULL all such devices are
1837  * removed.
1838  */
1839 int remove_conflicting_framebuffers(struct apertures_struct *a,
1840                                     const char *name, bool primary)
1841 {
1842         int ret;
1843         bool do_free = false;
1844
1845         if (!a) {
1846                 a = alloc_apertures(1);
1847                 if (!a)
1848                         return -ENOMEM;
1849
1850                 a->ranges[0].base = 0;
1851                 a->ranges[0].size = ~0;
1852                 do_free = true;
1853         }
1854
1855         mutex_lock(&registration_lock);
1856         ret = do_remove_conflicting_framebuffers(a, name, primary);
1857         mutex_unlock(&registration_lock);
1858
1859         if (do_free)
1860                 kfree(a);
1861
1862         return ret;
1863 }
1864 EXPORT_SYMBOL(remove_conflicting_framebuffers);
1865
1866 /**
1867  * remove_conflicting_pci_framebuffers - remove firmware-configured framebuffers for PCI devices
1868  * @pdev: PCI device
1869  * @res_id: index of PCI BAR configuring framebuffer memory
1870  * @name: requesting driver name
1871  *
1872  * This function removes framebuffer devices (eg. initialized by firmware)
1873  * using memory range configured for @pdev's BAR @res_id.
1874  *
1875  * The function assumes that PCI device with shadowed ROM drives a primary
1876  * display and so kicks out vga16fb.
1877  */
1878 int remove_conflicting_pci_framebuffers(struct pci_dev *pdev, int res_id, const char *name)
1879 {
1880         struct apertures_struct *ap;
1881         bool primary = false;
1882         int err;
1883
1884         ap = alloc_apertures(1);
1885         if (!ap)
1886                 return -ENOMEM;
1887
1888         ap->ranges[0].base = pci_resource_start(pdev, res_id);
1889         ap->ranges[0].size = pci_resource_len(pdev, res_id);
1890 #ifdef CONFIG_X86
1891         primary = pdev->resource[PCI_ROM_RESOURCE].flags &
1892                                         IORESOURCE_ROM_SHADOW;
1893 #endif
1894         err = remove_conflicting_framebuffers(ap, name, primary);
1895         kfree(ap);
1896         return err;
1897 }
1898 EXPORT_SYMBOL(remove_conflicting_pci_framebuffers);
1899
1900 /**
1901  *      register_framebuffer - registers a frame buffer device
1902  *      @fb_info: frame buffer info structure
1903  *
1904  *      Registers a frame buffer device @fb_info.
1905  *
1906  *      Returns negative errno on error, or zero for success.
1907  *
1908  */
1909 int
1910 register_framebuffer(struct fb_info *fb_info)
1911 {
1912         int ret;
1913
1914         mutex_lock(&registration_lock);
1915         ret = do_register_framebuffer(fb_info);
1916         mutex_unlock(&registration_lock);
1917
1918         return ret;
1919 }
1920 EXPORT_SYMBOL(register_framebuffer);
1921
1922 /**
1923  *      unregister_framebuffer - releases a frame buffer device
1924  *      @fb_info: frame buffer info structure
1925  *
1926  *      Unregisters a frame buffer device @fb_info.
1927  *
1928  *      Returns negative errno on error, or zero for success.
1929  *
1930  *      This function will also notify the framebuffer console
1931  *      to release the driver.
1932  *
1933  *      This is meant to be called within a driver's module_exit()
1934  *      function. If this is called outside module_exit(), ensure
1935  *      that the driver implements fb_open() and fb_release() to
1936  *      check that no processes are using the device.
1937  */
1938 int
1939 unregister_framebuffer(struct fb_info *fb_info)
1940 {
1941         int ret;
1942
1943         mutex_lock(&registration_lock);
1944         ret = do_unregister_framebuffer(fb_info);
1945         mutex_unlock(&registration_lock);
1946
1947         return ret;
1948 }
1949 EXPORT_SYMBOL(unregister_framebuffer);
1950
1951 /**
1952  *      fb_set_suspend - low level driver signals suspend
1953  *      @info: framebuffer affected
1954  *      @state: 0 = resuming, !=0 = suspending
1955  *
1956  *      This is meant to be used by low level drivers to
1957  *      signal suspend/resume to the core & clients.
1958  *      It must be called with the console semaphore held
1959  */
1960 void fb_set_suspend(struct fb_info *info, int state)
1961 {
1962         struct fb_event event;
1963
1964         event.info = info;
1965         if (state) {
1966                 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event);
1967                 info->state = FBINFO_STATE_SUSPENDED;
1968         } else {
1969                 info->state = FBINFO_STATE_RUNNING;
1970                 fb_notifier_call_chain(FB_EVENT_RESUME, &event);
1971         }
1972 }
1973 EXPORT_SYMBOL(fb_set_suspend);
1974
1975 /**
1976  *      fbmem_init - init frame buffer subsystem
1977  *
1978  *      Initialize the frame buffer subsystem.
1979  *
1980  *      NOTE: This function is _only_ to be called by drivers/char/mem.c.
1981  *
1982  */
1983
1984 static int __init
1985 fbmem_init(void)
1986 {
1987         int ret;
1988
1989         if (!proc_create_seq("fb", 0, NULL, &proc_fb_seq_ops))
1990                 return -ENOMEM;
1991
1992         ret = register_chrdev(FB_MAJOR, "fb", &fb_fops);
1993         if (ret) {
1994                 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1995                 goto err_chrdev;
1996         }
1997
1998         fb_class = class_create(THIS_MODULE, "graphics");
1999         if (IS_ERR(fb_class)) {
2000                 ret = PTR_ERR(fb_class);
2001                 pr_warn("Unable to create fb class; errno = %d\n", ret);
2002                 fb_class = NULL;
2003                 goto err_class;
2004         }
2005
2006         fb_console_init();
2007
2008         return 0;
2009
2010 err_class:
2011         unregister_chrdev(FB_MAJOR, "fb");
2012 err_chrdev:
2013         remove_proc_entry("fb", NULL);
2014         return ret;
2015 }
2016
2017 #ifdef MODULE
2018 module_init(fbmem_init);
2019 static void __exit
2020 fbmem_exit(void)
2021 {
2022         fb_console_exit();
2023
2024         remove_proc_entry("fb", NULL);
2025         class_destroy(fb_class);
2026         unregister_chrdev(FB_MAJOR, "fb");
2027 }
2028
2029 module_exit(fbmem_exit);
2030 MODULE_LICENSE("GPL");
2031 MODULE_DESCRIPTION("Framebuffer base");
2032 #else
2033 subsys_initcall(fbmem_init);
2034 #endif
2035
2036 int fb_new_modelist(struct fb_info *info)
2037 {
2038         struct fb_event event;
2039         struct fb_var_screeninfo var = info->var;
2040         struct list_head *pos, *n;
2041         struct fb_modelist *modelist;
2042         struct fb_videomode *m, mode;
2043         int err = 1;
2044
2045         list_for_each_safe(pos, n, &info->modelist) {
2046                 modelist = list_entry(pos, struct fb_modelist, list);
2047                 m = &modelist->mode;
2048                 fb_videomode_to_var(&var, m);
2049                 var.activate = FB_ACTIVATE_TEST;
2050                 err = fb_set_var(info, &var);
2051                 fb_var_to_videomode(&mode, &var);
2052                 if (err || !fb_mode_is_equal(m, &mode)) {
2053                         list_del(pos);
2054                         kfree(pos);
2055                 }
2056         }
2057
2058         err = 1;
2059
2060         if (!list_empty(&info->modelist)) {
2061                 event.info = info;
2062                 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
2063         }
2064
2065         return err;
2066 }
2067
2068 MODULE_LICENSE("GPL");