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/overflow.h>
  36
  37 #include <asm/fb.h>
  38
  39
  40     /*
  41      *  Frame buffer device initialization and setup routines
  42      */
  43
  44 #define FBPIXMAPSIZE    (1024 * 8)
  45
  46 static DEFINE_MUTEX(registration_lock);
  47
  48 struct fb_info *registered_fb[FB_MAX] __read_mostly;
  49 EXPORT_SYMBOL(registered_fb);
  50
  51 int num_registered_fb __read_mostly;
  52 EXPORT_SYMBOL(num_registered_fb);
  53
  54 static struct fb_info *get_fb_info(unsigned int idx)
  55 {
  56         struct fb_info *fb_info;
  57
  58         if (idx >= FB_MAX)
  59                 return ERR_PTR(-ENODEV);
  60
  61         mutex_lock(&registration_lock);
  62         fb_info = registered_fb[idx];
  63         if (fb_info)
  64                 atomic_inc(&fb_info->count);
  65         mutex_unlock(&registration_lock);
  66
  67         return fb_info;
  68 }
  69
  70 static void put_fb_info(struct fb_info *fb_info)
  71 {
  72         if (!atomic_dec_and_test(&fb_info->count))
  73                 return;
  74         if (fb_info->fbops->fb_destroy)
  75                 fb_info->fbops->fb_destroy(fb_info);
  76 }
  77
  78 int lock_fb_info(struct fb_info *info)
  79 {
  80         mutex_lock(&info->lock);
  81         if (!info->fbops) {
  82                 mutex_unlock(&info->lock);
  83                 return 0;
  84         }
  85         return 1;
  86 }
  87 EXPORT_SYMBOL(lock_fb_info);
  88
  89 /*
  90  * Helpers
  91  */
  92
  93 int fb_get_color_depth(struct fb_var_screeninfo *var,
  94                        struct fb_fix_screeninfo *fix)
  95 {
  96         int depth = 0;
  97
  98         if (fix->visual == FB_VISUAL_MONO01 ||
  99             fix->visual == FB_VISUAL_MONO10)
 100                 depth = 1;
 101         else {
 102                 if (var->green.length == var->blue.length &&
 103                     var->green.length == var->red.length &&
 104                     var->green.offset == var->blue.offset &&
 105                     var->green.offset == var->red.offset)
 106                         depth = var->green.length;
 107                 else
 108                         depth = var->green.length + var->red.length +
 109                                 var->blue.length;
 110         }
 111
 112         return depth;
 113 }
 114 EXPORT_SYMBOL(fb_get_color_depth);
 115
 116 /*
 117  * Data padding functions.
 118  */
 119 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
 120 {
 121         __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
 122 }
 123 EXPORT_SYMBOL(fb_pad_aligned_buffer);
 124
 125 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
 126                                 u32 shift_high, u32 shift_low, u32 mod)
 127 {
 128         u8 mask = (u8) (0xfff << shift_high), tmp;
 129         int i, j;
 130
 131         for (i = height; i--; ) {
 132                 for (j = 0; j < idx; j++) {
 133                         tmp = dst[j];
 134                         tmp &= mask;
 135                         tmp |= *src >> shift_low;
 136                         dst[j] = tmp;
 137                         tmp = *src << shift_high;
 138                         dst[j+1] = tmp;
 139                         src++;
 140                 }
 141                 tmp = dst[idx];
 142                 tmp &= mask;
 143                 tmp |= *src >> shift_low;
 144                 dst[idx] = tmp;
 145                 if (shift_high < mod) {
 146                         tmp = *src << shift_high;
 147                         dst[idx+1] = tmp;
 148                 }
 149                 src++;
 150                 dst += d_pitch;
 151         }
 152 }
 153 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
 154
 155 /*
 156  * we need to lock this section since fb_cursor
 157  * may use fb_imageblit()
 158  */
 159 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
 160 {
 161         u32 align = buf->buf_align - 1, offset;
 162         char *addr = buf->addr;
 163
 164         /* If IO mapped, we need to sync before access, no sharing of
 165          * the pixmap is done
 166          */
 167         if (buf->flags & FB_PIXMAP_IO) {
 168                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 169                         info->fbops->fb_sync(info);
 170                 return addr;
 171         }
 172
 173         /* See if we fit in the remaining pixmap space */
 174         offset = buf->offset + align;
 175         offset &= ~align;
 176         if (offset + size > buf->size) {
 177                 /* We do not fit. In order to be able to re-use the buffer,
 178                  * we must ensure no asynchronous DMA'ing or whatever operation
 179                  * is in progress, we sync for that.
 180                  */
 181                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 182                         info->fbops->fb_sync(info);
 183                 offset = 0;
 184         }
 185         buf->offset = offset + size;
 186         addr += offset;
 187
 188         return addr;
 189 }
 190 EXPORT_SYMBOL(fb_get_buffer_offset);
 191
 192 #ifdef CONFIG_LOGO
 193
 194 static inline unsigned safe_shift(unsigned d, int n)
 195 {
 196         return n < 0 ? d >> -n : d << n;
 197 }
 198
 199 static void fb_set_logocmap(struct fb_info *info,
 200                                    const struct linux_logo *logo)
 201 {
 202         struct fb_cmap palette_cmap;
 203         u16 palette_green[16];
 204         u16 palette_blue[16];
 205         u16 palette_red[16];
 206         int i, j, n;
 207         const unsigned char *clut = logo->clut;
 208
 209         palette_cmap.start = 0;
 210         palette_cmap.len = 16;
 211         palette_cmap.red = palette_red;
 212         palette_cmap.green = palette_green;
 213         palette_cmap.blue = palette_blue;
 214         palette_cmap.transp = NULL;
 215
 216         for (i = 0; i < logo->clutsize; i += n) {
 217                 n = logo->clutsize - i;
 218                 /* palette_cmap provides space for only 16 colors at once */
 219                 if (n > 16)
 220                         n = 16;
 221                 palette_cmap.start = 32 + i;
 222                 palette_cmap.len = n;
 223                 for (j = 0; j < n; ++j) {
 224                         palette_cmap.red[j] = clut[0] << 8 | clut[0];
 225                         palette_cmap.green[j] = clut[1] << 8 | clut[1];
 226                         palette_cmap.blue[j] = clut[2] << 8 | clut[2];
 227                         clut += 3;
 228                 }
 229                 fb_set_cmap(&palette_cmap, info);
 230         }
 231 }
 232
 233 static void  fb_set_logo_truepalette(struct fb_info *info,
 234                                             const struct linux_logo *logo,
 235                                             u32 *palette)
 236 {
 237         static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
 238         unsigned char redmask, greenmask, bluemask;
 239         int redshift, greenshift, blueshift;
 240         int i;
 241         const unsigned char *clut = logo->clut;
 242
 243         /*
 244          * We have to create a temporary palette since console palette is only
 245          * 16 colors long.
 246          */
 247         /* Bug: Doesn't obey msb_right ... (who needs that?) */
 248         redmask   = mask[info->var.red.length   < 8 ? info->var.red.length   : 8];
 249         greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
 250         bluemask  = mask[info->var.blue.length  < 8 ? info->var.blue.length  : 8];
 251         redshift   = info->var.red.offset   - (8 - info->var.red.length);
 252         greenshift = info->var.green.offset - (8 - info->var.green.length);
 253         blueshift  = info->var.blue.offset  - (8 - info->var.blue.length);
 254
 255         for ( i = 0; i < logo->clutsize; i++) {
 256                 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
 257                                  safe_shift((clut[1] & greenmask), greenshift) |
 258                                  safe_shift((clut[2] & bluemask), blueshift));
 259                 clut += 3;
 260         }
 261 }
 262
 263 static void fb_set_logo_directpalette(struct fb_info *info,
 264                                              const struct linux_logo *logo,
 265                                              u32 *palette)
 266 {
 267         int redshift, greenshift, blueshift;
 268         int i;
 269
 270         redshift = info->var.red.offset;
 271         greenshift = info->var.green.offset;
 272         blueshift = info->var.blue.offset;
 273
 274         for (i = 32; i < 32 + logo->clutsize; i++)
 275                 palette[i] = i << redshift | i << greenshift | i << blueshift;
 276 }
 277
 278 static void fb_set_logo(struct fb_info *info,
 279                                const struct linux_logo *logo, u8 *dst,
 280                                int depth)
 281 {
 282         int i, j, k;
 283         const u8 *src = logo->data;
 284         u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
 285         u8 fg = 1, d;
 286
 287         switch (fb_get_color_depth(&info->var, &info->fix)) {
 288         case 1:
 289                 fg = 1;
 290                 break;
 291         case 2:
 292                 fg = 3;
 293                 break;
 294         default:
 295                 fg = 7;
 296                 break;
 297         }
 298
 299         if (info->fix.visual == FB_VISUAL_MONO01 ||
 300             info->fix.visual == FB_VISUAL_MONO10)
 301                 fg = ~((u8) (0xfff << info->var.green.length));
 302
 303         switch (depth) {
 304         case 4:
 305                 for (i = 0; i < logo->height; i++)
 306                         for (j = 0; j < logo->width; src++) {
 307                                 *dst++ = *src >> 4;
 308                                 j++;
 309                                 if (j < logo->width) {
 310                                         *dst++ = *src & 0x0f;
 311                                         j++;
 312                                 }
 313                         }
 314                 break;
 315         case 1:
 316                 for (i = 0; i < logo->height; i++) {
 317                         for (j = 0; j < logo->width; src++) {
 318                                 d = *src ^ xor;
 319                                 for (k = 7; k >= 0; k--) {
 320                                         *dst++ = ((d >> k) & 1) ? fg : 0;
 321                                         j++;
 322                                 }
 323                         }
 324                 }
 325                 break;
 326         }
 327 }
 328
 329 /*
 330  * Three (3) kinds of logo maps exist.  linux_logo_clut224 (>16 colors),
 331  * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors).  Depending on
 332  * the visual format and color depth of the framebuffer, the DAC, the
 333  * pseudo_palette, and the logo data will be adjusted accordingly.
 334  *
 335  * Case 1 - linux_logo_clut224:
 336  * Color exceeds the number of console colors (16), thus we set the hardware DAC
 337  * using fb_set_cmap() appropriately.  The "needs_cmapreset"  flag will be set.
 338  *
 339  * For visuals that require color info from the pseudo_palette, we also construct
 340  * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
 341  * will be set.
 342  *
 343  * Case 2 - linux_logo_vga16:
 344  * The number of colors just matches the console colors, thus there is no need
 345  * to set the DAC or the pseudo_palette.  However, the bitmap is packed, ie,
 346  * each byte contains color information for two pixels (upper and lower nibble).
 347  * To be consistent with fb_imageblit() usage, we therefore separate the two
 348  * nibbles into separate bytes. The "depth" flag will be set to 4.
 349  *
 350  * Case 3 - linux_logo_mono:
 351  * This is similar with Case 2.  Each byte contains information for 8 pixels.
 352  * We isolate each bit and expand each into a byte. The "depth" flag will
 353  * be set to 1.
 354  */
 355 static struct logo_data {
 356         int depth;
 357         int needs_directpalette;
 358         int needs_truepalette;
 359         int needs_cmapreset;
 360         const struct linux_logo *logo;
 361 } fb_logo __read_mostly;
 362
 363 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
 364 {
 365         u32 size = width * height, i;
 366
 367         out += size - 1;
 368
 369         for (i = size; i--; )
 370                 *out-- = *in++;
 371 }
 372
 373 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
 374 {
 375         int i, j, h = height - 1;
 376
 377         for (i = 0; i < height; i++)
 378                 for (j = 0; j < width; j++)
 379                                 out[height * j + h - i] = *in++;
 380 }
 381
 382 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
 383 {
 384         int i, j, w = width - 1;
 385
 386         for (i = 0; i < height; i++)
 387                 for (j = 0; j < width; j++)
 388                         out[height * (w - j) + i] = *in++;
 389 }
 390
 391 static void fb_rotate_logo(struct fb_info *info, u8 *dst,
 392                            struct fb_image *image, int rotate)
 393 {
 394         u32 tmp;
 395
 396         if (rotate == FB_ROTATE_UD) {
 397                 fb_rotate_logo_ud(image->data, dst, image->width,
 398                                   image->height);
 399                 image->dx = info->var.xres - image->width - image->dx;
 400                 image->dy = info->var.yres - image->height - image->dy;
 401         } else if (rotate == FB_ROTATE_CW) {
 402                 fb_rotate_logo_cw(image->data, dst, image->width,
 403                                   image->height);
 404                 tmp = image->width;
 405                 image->width = image->height;
 406                 image->height = tmp;
 407                 tmp = image->dy;
 408                 image->dy = image->dx;
 409                 image->dx = info->var.xres - image->width - tmp;
 410         } else if (rotate == FB_ROTATE_CCW) {
 411                 fb_rotate_logo_ccw(image->data, dst, image->width,
 412                                    image->height);
 413                 tmp = image->width;
 414                 image->width = image->height;
 415                 image->height = tmp;
 416                 tmp = image->dx;
 417                 image->dx = image->dy;
 418                 image->dy = info->var.yres - image->height - tmp;
 419         }
 420
 421         image->data = dst;
 422 }
 423
 424 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
 425                             int rotate, unsigned int num)
 426 {
 427         unsigned int x;
 428
 429         if (image->width > info->var.xres || image->height > info->var.yres)
 430                 return;
 431
 432         if (rotate == FB_ROTATE_UR) {
 433                 for (x = 0;
 434                      x < num && image->dx + image->width <= info->var.xres;
 435                      x++) {
 436                         info->fbops->fb_imageblit(info, image);
 437                         image->dx += image->width + 8;
 438                 }
 439         } else if (rotate == FB_ROTATE_UD) {
 440                 u32 dx = image->dx;
 441
 442                 for (x = 0; x < num && image->dx <= dx; x++) {
 443                         info->fbops->fb_imageblit(info, image);
 444                         image->dx -= image->width + 8;
 445                 }
 446         } else if (rotate == FB_ROTATE_CW) {
 447                 for (x = 0;
 448                      x < num && image->dy + image->height <= info->var.yres;
 449                      x++) {
 450                         info->fbops->fb_imageblit(info, image);
 451                         image->dy += image->height + 8;
 452                 }
 453         } else if (rotate == FB_ROTATE_CCW) {
 454                 u32 dy = image->dy;
 455
 456                 for (x = 0; x < num && image->dy <= dy; x++) {
 457                         info->fbops->fb_imageblit(info, image);
 458                         image->dy -= image->height + 8;
 459                 }
 460         }
 461 }
 462
 463 static int fb_show_logo_line(struct fb_info *info, int rotate,
 464                              const struct linux_logo *logo, int y,
 465                              unsigned int n)
 466 {
 467         u32 *palette = NULL, *saved_pseudo_palette = NULL;
 468         unsigned char *logo_new = NULL, *logo_rotate = NULL;
 469         struct fb_image image;
 470
 471         /* Return if the frame buffer is not mapped or suspended */
 472         if (logo == NULL || info->state != FBINFO_STATE_RUNNING ||
 473             info->flags & FBINFO_MODULE)
 474                 return 0;
 475
 476         image.depth = 8;
 477         image.data = logo->data;
 478
 479         if (fb_logo.needs_cmapreset)
 480                 fb_set_logocmap(info, logo);
 481
 482         if (fb_logo.needs_truepalette ||
 483             fb_logo.needs_directpalette) {
 484                 palette = kmalloc(256 * 4, GFP_KERNEL);
 485                 if (palette == NULL)
 486                         return 0;
 487
 488                 if (fb_logo.needs_truepalette)
 489                         fb_set_logo_truepalette(info, logo, palette);
 490                 else
 491                         fb_set_logo_directpalette(info, logo, palette);
 492
 493                 saved_pseudo_palette = info->pseudo_palette;
 494                 info->pseudo_palette = palette;
 495         }
 496
 497         if (fb_logo.depth <= 4) {
 498                 logo_new = kmalloc(logo->width * logo->height, GFP_KERNEL);
 499                 if (logo_new == NULL) {
 500                         kfree(palette);
 501                         if (saved_pseudo_palette)
 502                                 info->pseudo_palette = saved_pseudo_palette;
 503                         return 0;
 504                 }
 505                 image.data = logo_new;
 506                 fb_set_logo(info, logo, logo_new, fb_logo.depth);
 507         }
 508
 509         image.dx = 0;
 510         image.dy = y;
 511         image.width = logo->width;
 512         image.height = logo->height;
 513
 514         if (rotate) {
 515                 logo_rotate = kmalloc(logo->width *
 516                                       logo->height, GFP_KERNEL);
 517                 if (logo_rotate)
 518                         fb_rotate_logo(info, logo_rotate, &image, rotate);
 519         }
 520
 521         fb_do_show_logo(info, &image, rotate, n);
 522
 523         kfree(palette);
 524         if (saved_pseudo_palette != NULL)
 525                 info->pseudo_palette = saved_pseudo_palette;
 526         kfree(logo_new);
 527         kfree(logo_rotate);
 528         return logo->height;
 529 }
 530
 531
 532 #ifdef CONFIG_FB_LOGO_EXTRA
 533
 534 #define FB_LOGO_EX_NUM_MAX 10
 535 static struct logo_data_extra {
 536         const struct linux_logo *logo;
 537         unsigned int n;
 538 } fb_logo_ex[FB_LOGO_EX_NUM_MAX];
 539 static unsigned int fb_logo_ex_num;
 540
 541 void fb_append_extra_logo(const struct linux_logo *logo, unsigned int n)
 542 {
 543         if (!n || fb_logo_ex_num == FB_LOGO_EX_NUM_MAX)
 544                 return;
 545
 546         fb_logo_ex[fb_logo_ex_num].logo = logo;
 547         fb_logo_ex[fb_logo_ex_num].n = n;
 548         fb_logo_ex_num++;
 549 }
 550
 551 static int fb_prepare_extra_logos(struct fb_info *info, unsigned int height,
 552                                   unsigned int yres)
 553 {
 554         unsigned int i;
 555
 556         /* FIXME: logo_ex supports only truecolor fb. */
 557         if (info->fix.visual != FB_VISUAL_TRUECOLOR)
 558                 fb_logo_ex_num = 0;
 559
 560         for (i = 0; i < fb_logo_ex_num; i++) {
 561                 if (fb_logo_ex[i].logo->type != fb_logo.logo->type) {
 562                         fb_logo_ex[i].logo = NULL;
 563                         continue;
 564                 }
 565                 height += fb_logo_ex[i].logo->height;
 566                 if (height > yres) {
 567                         height -= fb_logo_ex[i].logo->height;
 568                         fb_logo_ex_num = i;
 569                         break;
 570                 }
 571         }
 572         return height;
 573 }
 574
 575 static int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
 576 {
 577         unsigned int i;
 578
 579         for (i = 0; i < fb_logo_ex_num; i++)
 580                 y += fb_show_logo_line(info, rotate,
 581                                        fb_logo_ex[i].logo, y, fb_logo_ex[i].n);
 582
 583         return y;
 584 }
 585
 586 #else /* !CONFIG_FB_LOGO_EXTRA */
 587
 588 static inline int fb_prepare_extra_logos(struct fb_info *info,
 589                                          unsigned int height,
 590                                          unsigned int yres)
 591 {
 592         return height;
 593 }
 594
 595 static inline int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
 596 {
 597         return y;
 598 }
 599
 600 #endif /* CONFIG_FB_LOGO_EXTRA */
 601
 602
 603 int fb_prepare_logo(struct fb_info *info, int rotate)
 604 {
 605         int depth = fb_get_color_depth(&info->var, &info->fix);
 606         unsigned int yres;
 607
 608         memset(&fb_logo, 0, sizeof(struct logo_data));
 609
 610         if (info->flags & FBINFO_MISC_TILEBLITTING ||
 611             info->flags & FBINFO_MODULE)
 612                 return 0;
 613
 614         if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
 615                 depth = info->var.blue.length;
 616                 if (info->var.red.length < depth)
 617                         depth = info->var.red.length;
 618                 if (info->var.green.length < depth)
 619                         depth = info->var.green.length;
 620         }
 621
 622         if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) {
 623                 /* assume console colormap */
 624                 depth = 4;
 625         }
 626
 627         /* Return if no suitable logo was found */
 628         fb_logo.logo = fb_find_logo(depth);
 629
 630         if (!fb_logo.logo) {
 631                 return 0;
 632         }
 633
 634         if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
 635                 yres = info->var.yres;
 636         else
 637                 yres = info->var.xres;
 638
 639         if (fb_logo.logo->height > yres) {
 640                 fb_logo.logo = NULL;
 641                 return 0;
 642         }
 643
 644         /* What depth we asked for might be different from what we get */
 645         if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
 646                 fb_logo.depth = 8;
 647         else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
 648                 fb_logo.depth = 4;
 649         else
 650                 fb_logo.depth = 1;
 651
 652
 653         if (fb_logo.depth > 4 && depth > 4) {
 654                 switch (info->fix.visual) {
 655                 case FB_VISUAL_TRUECOLOR:
 656                         fb_logo.needs_truepalette = 1;
 657                         break;
 658                 case FB_VISUAL_DIRECTCOLOR:
 659                         fb_logo.needs_directpalette = 1;
 660                         fb_logo.needs_cmapreset = 1;
 661                         break;
 662                 case FB_VISUAL_PSEUDOCOLOR:
 663                         fb_logo.needs_cmapreset = 1;
 664                         break;
 665                 }
 666         }
 667
 668         return fb_prepare_extra_logos(info, fb_logo.logo->height, yres);
 669 }
 670
 671 int fb_show_logo(struct fb_info *info, int rotate)
 672 {
 673         int y;
 674
 675         y = fb_show_logo_line(info, rotate, fb_logo.logo, 0,
 676                               num_online_cpus());
 677         y = fb_show_extra_logos(info, y, rotate);
 678
 679         return y;
 680 }
 681 #else
 682 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
 683 int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
 684 #endif /* CONFIG_LOGO */
 685 EXPORT_SYMBOL(fb_prepare_logo);
 686 EXPORT_SYMBOL(fb_show_logo);
 687
 688 static void *fb_seq_start(struct seq_file *m, loff_t *pos)
 689 {
 690         mutex_lock(&registration_lock);
 691         return (*pos < FB_MAX) ? pos : NULL;
 692 }
 693
 694 static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos)
 695 {
 696         (*pos)++;
 697         return (*pos < FB_MAX) ? pos : NULL;
 698 }
 699
 700 static void fb_seq_stop(struct seq_file *m, void *v)
 701 {
 702         mutex_unlock(&registration_lock);
 703 }
 704
 705 static int fb_seq_show(struct seq_file *m, void *v)
 706 {
 707         int i = *(loff_t *)v;
 708         struct fb_info *fi = registered_fb[i];
 709
 710         if (fi)
 711                 seq_printf(m, "%d %s\n", fi->node, fi->fix.id);
 712         return 0;
 713 }
 714
 715 static const struct seq_operations proc_fb_seq_ops = {
 716         .start  = fb_seq_start,
 717         .next   = fb_seq_next,
 718         .stop   = fb_seq_stop,
 719         .show   = fb_seq_show,
 720 };
 721
 722 static int proc_fb_open(struct inode *inode, struct file *file)
 723 {
 724         return seq_open(file, &proc_fb_seq_ops);
 725 }
 726
 727 static const struct file_operations fb_proc_fops = {
 728         .owner          = THIS_MODULE,
 729         .open           = proc_fb_open,
 730         .read           = seq_read,
 731         .llseek         = seq_lseek,
 732         .release        = seq_release,
 733 };
 734
 735 /*
 736  * We hold a reference to the fb_info in file->private_data,
 737  * but if the current registered fb has changed, we don't
 738  * actually want to use it.
 739  *
 740  * So look up the fb_info using the inode minor number,
 741  * and just verify it against the reference we have.
 742  */
 743 static struct fb_info *file_fb_info(struct file *file)
 744 {
 745         struct inode *inode = file_inode(file);
 746         int fbidx = iminor(inode);
 747         struct fb_info *info = registered_fb[fbidx];
 748
 749         if (info != file->private_data)
 750                 info = NULL;
 751         return info;
 752 }
 753
 754 static ssize_t
 755 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 756 {
 757         unsigned long p = *ppos;
 758         struct fb_info *info = file_fb_info(file);
 759         u8 *buffer, *dst;
 760         u8 __iomem *src;
 761         int c, cnt = 0, err = 0;
 762         unsigned long total_size;
 763
 764         if (!info || ! info->screen_base)
 765                 return -ENODEV;
 766
 767         if (info->state != FBINFO_STATE_RUNNING)
 768                 return -EPERM;
 769
 770         if (info->fbops->fb_read)
 771                 return info->fbops->fb_read(info, buf, count, ppos);
 772
 773         total_size = info->screen_size;
 774
 775         if (total_size == 0)
 776                 total_size = info->fix.smem_len;
 777
 778         if (p >= total_size)
 779                 return 0;
 780
 781         if (count >= total_size)
 782                 count = total_size;
 783
 784         if (count + p > total_size)
 785                 count = total_size - p;
 786
 787         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 788                          GFP_KERNEL);
 789         if (!buffer)
 790                 return -ENOMEM;
 791
 792         src = (u8 __iomem *) (info->screen_base + p);
 793
 794         if (info->fbops->fb_sync)
 795                 info->fbops->fb_sync(info);
 796
 797         while (count) {
 798                 c  = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 799                 dst = buffer;
 800                 fb_memcpy_fromfb(dst, src, c);
 801                 dst += c;
 802                 src += c;
 803
 804                 if (copy_to_user(buf, buffer, c)) {
 805                         err = -EFAULT;
 806                         break;
 807                 }
 808                 *ppos += c;
 809                 buf += c;
 810                 cnt += c;
 811                 count -= c;
 812         }
 813
 814         kfree(buffer);
 815
 816         return (err) ? err : cnt;
 817 }
 818
 819 static ssize_t
 820 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 821 {
 822         unsigned long p = *ppos;
 823         struct fb_info *info = file_fb_info(file);
 824         u8 *buffer, *src;
 825         u8 __iomem *dst;
 826         int c, cnt = 0, err = 0;
 827         unsigned long total_size;
 828
 829         if (!info || !info->screen_base)
 830                 return -ENODEV;
 831
 832         if (info->state != FBINFO_STATE_RUNNING)
 833                 return -EPERM;
 834
 835         if (info->fbops->fb_write)
 836                 return info->fbops->fb_write(info, buf, count, ppos);
 837
 838         total_size = info->screen_size;
 839
 840         if (total_size == 0)
 841                 total_size = info->fix.smem_len;
 842
 843         if (p > total_size)
 844                 return -EFBIG;
 845
 846         if (count > total_size) {
 847                 err = -EFBIG;
 848                 count = total_size;
 849         }
 850
 851         if (count + p > total_size) {
 852                 if (!err)
 853                         err = -ENOSPC;
 854
 855                 count = total_size - p;
 856         }
 857
 858         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 859                          GFP_KERNEL);
 860         if (!buffer)
 861                 return -ENOMEM;
 862
 863         dst = (u8 __iomem *) (info->screen_base + p);
 864
 865         if (info->fbops->fb_sync)
 866                 info->fbops->fb_sync(info);
 867
 868         while (count) {
 869                 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 870                 src = buffer;
 871
 872                 if (copy_from_user(src, buf, c)) {
 873                         err = -EFAULT;
 874                         break;
 875                 }
 876
 877                 fb_memcpy_tofb(dst, src, c);
 878                 dst += c;
 879                 src += c;
 880                 *ppos += c;
 881                 buf += c;
 882                 cnt += c;
 883                 count -= c;
 884         }
 885
 886         kfree(buffer);
 887
 888         return (cnt) ? cnt : err;
 889 }
 890
 891 int
 892 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
 893 {
 894         struct fb_fix_screeninfo *fix = &info->fix;
 895         unsigned int yres = info->var.yres;
 896         int err = 0;
 897
 898         if (var->yoffset > 0) {
 899                 if (var->vmode & FB_VMODE_YWRAP) {
 900                         if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
 901                                 err = -EINVAL;
 902                         else
 903                                 yres = 0;
 904                 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
 905                         err = -EINVAL;
 906         }
 907
 908         if (var->xoffset > 0 && (!fix->xpanstep ||
 909                                  (var->xoffset % fix->xpanstep)))
 910                 err = -EINVAL;
 911
 912         if (err || !info->fbops->fb_pan_display ||
 913             var->yoffset > info->var.yres_virtual - yres ||
 914             var->xoffset > info->var.xres_virtual - info->var.xres)
 915                 return -EINVAL;
 916
 917         if ((err = info->fbops->fb_pan_display(var, info)))
 918                 return err;
 919         info->var.xoffset = var->xoffset;
 920         info->var.yoffset = var->yoffset;
 921         if (var->vmode & FB_VMODE_YWRAP)
 922                 info->var.vmode |= FB_VMODE_YWRAP;
 923         else
 924                 info->var.vmode &= ~FB_VMODE_YWRAP;
 925         return 0;
 926 }
 927 EXPORT_SYMBOL(fb_pan_display);
 928
 929 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var,
 930                          u32 activate)
 931 {
 932         struct fb_event event;
 933         struct fb_blit_caps caps, fbcaps;
 934         int err = 0;
 935
 936         memset(&caps, 0, sizeof(caps));
 937         memset(&fbcaps, 0, sizeof(fbcaps));
 938         caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0;
 939         event.info = info;
 940         event.data = &caps;
 941         fb_notifier_call_chain(FB_EVENT_GET_REQ, &event);
 942         info->fbops->fb_get_caps(info, &fbcaps, var);
 943
 944         if (((fbcaps.x ^ caps.x) & caps.x) ||
 945             ((fbcaps.y ^ caps.y) & caps.y) ||
 946             (fbcaps.len < caps.len))
 947                 err = -EINVAL;
 948
 949         return err;
 950 }
 951
 952 int
 953 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
 954 {
 955         int flags = info->flags;
 956         int ret = 0;
 957
 958         if (var->activate & FB_ACTIVATE_INV_MODE) {
 959                 struct fb_videomode mode1, mode2;
 960
 961                 fb_var_to_videomode(&mode1, var);
 962                 fb_var_to_videomode(&mode2, &info->var);
 963                 /* make sure we don't delete the videomode of current var */
 964                 ret = fb_mode_is_equal(&mode1, &mode2);
 965
 966                 if (!ret) {
 967                     struct fb_event event;
 968
 969                     event.info = info;
 970                     event.data = &mode1;
 971                     ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event);
 972                 }
 973
 974                 if (!ret)
 975                     fb_delete_videomode(&mode1, &info->modelist);
 976
 977
 978                 ret = (ret) ? -EINVAL : 0;
 979                 goto done;
 980         }
 981
 982         if ((var->activate & FB_ACTIVATE_FORCE) ||
 983             memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
 984                 u32 activate = var->activate;
 985                 u32 unused;
 986
 987                 /* When using FOURCC mode, make sure the red, green, blue and
 988                  * transp fields are set to 0.
 989                  */
 990                 if ((info->fix.capabilities & FB_CAP_FOURCC) &&
 991                     var->grayscale > 1) {
 992                         if (var->red.offset     || var->green.offset    ||
 993                             var->blue.offset    || var->transp.offset   ||
 994                             var->red.length     || var->green.length    ||
 995                             var->blue.length    || var->transp.length   ||
 996                             var->red.msb_right  || var->green.msb_right ||
 997                             var->blue.msb_right || var->transp.msb_right)
 998                                 return -EINVAL;
 999                 }
1000
1001                 if (!info->fbops->fb_check_var) {
1002                         *var = info->var;
1003                         goto done;
1004                 }
1005
1006                 /* bitfill_aligned() assumes that it's at least 8x8 */
1007                 if (var->xres < 8 || var->yres < 8)
1008                         return -EINVAL;
1009
1010                 /* Too huge resolution causes multiplication overflow. */
1011                 if (check_mul_overflow(var->xres, var->yres, &unused) ||
1012                     check_mul_overflow(var->xres_virtual, var->yres_virtual, &unused))
1013                         return -EINVAL;
1014
1015                 ret = info->fbops->fb_check_var(var, info);
1016
1017                 if (ret)
1018                         goto done;
1019
1020                 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
1021                         struct fb_var_screeninfo old_var;
1022                         struct fb_videomode mode;
1023
1024                         if (info->fbops->fb_get_caps) {
1025                                 ret = fb_check_caps(info, var, activate);
1026
1027                                 if (ret)
1028                                         goto done;
1029                         }
1030
1031                         old_var = info->var;
1032                         info->var = *var;
1033
1034                         if (info->fbops->fb_set_par) {
1035                                 ret = info->fbops->fb_set_par(info);
1036
1037                                 if (ret) {
1038                                         info->var = old_var;
1039                                         printk(KERN_WARNING "detected "
1040                                                 "fb_set_par error, "
1041                                                 "error code: %d\n", ret);
1042                                         goto done;
1043                                 }
1044                         }
1045
1046                         fb_pan_display(info, &info->var);
1047                         fb_set_cmap(&info->cmap, info);
1048                         fb_var_to_videomode(&mode, &info->var);
1049
1050                         if (info->modelist.prev && info->modelist.next &&
1051                             !list_empty(&info->modelist))
1052                                 ret = fb_add_videomode(&mode, &info->modelist);
1053
1054                         if (!ret && (flags & FBINFO_MISC_USEREVENT)) {
1055                                 struct fb_event event;
1056                                 int evnt = (activate & FB_ACTIVATE_ALL) ?
1057                                         FB_EVENT_MODE_CHANGE_ALL :
1058                                         FB_EVENT_MODE_CHANGE;
1059
1060                                 info->flags &= ~FBINFO_MISC_USEREVENT;
1061                                 event.info = info;
1062                                 event.data = &mode;
1063                                 fb_notifier_call_chain(evnt, &event);
1064                         }
1065                 }
1066         }
1067
1068  done:
1069         return ret;
1070 }
1071 EXPORT_SYMBOL(fb_set_var);
1072
1073 int
1074 fb_blank(struct fb_info *info, int blank)
1075 {
1076         struct fb_event event;
1077         int ret = -EINVAL, early_ret;
1078
1079         if (blank > FB_BLANK_POWERDOWN)
1080                 blank = FB_BLANK_POWERDOWN;
1081
1082         event.info = info;
1083         event.data = &blank;
1084
1085         early_ret = fb_notifier_call_chain(FB_EARLY_EVENT_BLANK, &event);
1086
1087         if (info->fbops->fb_blank)
1088                 ret = info->fbops->fb_blank(blank, info);
1089
1090         if (!ret)
1091                 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
1092         else {
1093                 /*
1094                  * if fb_blank is failed then revert effects of
1095                  * the early blank event.
1096                  */
1097                 if (!early_ret)
1098                         fb_notifier_call_chain(FB_R_EARLY_EVENT_BLANK, &event);
1099         }
1100
1101         return ret;
1102 }
1103 EXPORT_SYMBOL(fb_blank);
1104
1105 static long do_fb_ioctl(struct fb_info *info, unsigned int cmd,
1106                         unsigned long arg)
1107 {
1108         struct fb_ops *fb;
1109         struct fb_var_screeninfo var;
1110         struct fb_fix_screeninfo fix;
1111         struct fb_con2fbmap con2fb;
1112         struct fb_cmap cmap_from;
1113         struct fb_cmap_user cmap;
1114         struct fb_event event;
1115         void __user *argp = (void __user *)arg;
1116         long ret = 0;
1117
1118         switch (cmd) {
1119         case FBIOGET_VSCREENINFO:
1120                 if (!lock_fb_info(info))
1121                         return -ENODEV;
1122                 var = info->var;
1123                 unlock_fb_info(info);
1124
1125                 ret = copy_to_user(argp, &var, sizeof(var)) ? -EFAULT : 0;
1126                 break;
1127         case FBIOPUT_VSCREENINFO:
1128                 if (copy_from_user(&var, argp, sizeof(var)))
1129                         return -EFAULT;
1130                 console_lock();
1131                 if (!lock_fb_info(info)) {
1132                         console_unlock();
1133                         return -ENODEV;
1134                 }
1135                 info->flags |= FBINFO_MISC_USEREVENT;
1136                 ret = fb_set_var(info, &var);
1137                 info->flags &= ~FBINFO_MISC_USEREVENT;
1138                 unlock_fb_info(info);
1139                 console_unlock();
1140                 if (!ret && copy_to_user(argp, &var, sizeof(var)))
1141                         ret = -EFAULT;
1142                 break;
1143         case FBIOGET_FSCREENINFO:
1144                 if (!lock_fb_info(info))
1145                         return -ENODEV;
1146                 memcpy(&fix, &info->fix, sizeof(fix));
1147                 unlock_fb_info(info);
1148
1149                 ret = copy_to_user(argp, &fix, sizeof(fix)) ? -EFAULT : 0;
1150                 break;
1151         case FBIOPUTCMAP:
1152                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1153                         return -EFAULT;
1154                 ret = fb_set_user_cmap(&cmap, info);
1155                 break;
1156         case FBIOGETCMAP:
1157                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1158                         return -EFAULT;
1159                 if (!lock_fb_info(info))
1160                         return -ENODEV;
1161                 cmap_from = info->cmap;
1162                 unlock_fb_info(info);
1163                 ret = fb_cmap_to_user(&cmap_from, &cmap);
1164                 break;
1165         case FBIOPAN_DISPLAY:
1166                 if (copy_from_user(&var, argp, sizeof(var)))
1167                         return -EFAULT;
1168                 console_lock();
1169                 if (!lock_fb_info(info)) {
1170                         console_unlock();
1171                         return -ENODEV;
1172                 }
1173                 ret = fb_pan_display(info, &var);
1174                 unlock_fb_info(info);
1175                 console_unlock();
1176                 if (ret == 0 && copy_to_user(argp, &var, sizeof(var)))
1177                         return -EFAULT;
1178                 break;
1179         case FBIO_CURSOR:
1180                 ret = -EINVAL;
1181                 break;
1182         case FBIOGET_CON2FBMAP:
1183                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1184                         return -EFAULT;
1185                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1186                         return -EINVAL;
1187                 con2fb.framebuffer = -1;
1188                 event.data = &con2fb;
1189                 if (!lock_fb_info(info))
1190                         return -ENODEV;
1191                 event.info = info;
1192                 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
1193                 unlock_fb_info(info);
1194                 ret = copy_to_user(argp, &con2fb, sizeof(con2fb)) ? -EFAULT : 0;
1195                 break;
1196         case FBIOPUT_CON2FBMAP:
1197                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1198                         return -EFAULT;
1199                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1200                         return -EINVAL;
1201                 if (con2fb.framebuffer >= FB_MAX)
1202                         return -EINVAL;
1203                 if (!registered_fb[con2fb.framebuffer])
1204                         request_module("fb%d", con2fb.framebuffer);
1205                 if (!registered_fb[con2fb.framebuffer]) {
1206                         ret = -EINVAL;
1207                         break;
1208                 }
1209                 event.data = &con2fb;
1210                 console_lock();
1211                 if (!lock_fb_info(info)) {
1212                         console_unlock();
1213                         return -ENODEV;
1214                 }
1215                 event.info = info;
1216                 ret = fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP, &event);
1217                 unlock_fb_info(info);
1218                 console_unlock();
1219                 break;
1220         case FBIOBLANK:
1221                 console_lock();
1222                 if (!lock_fb_info(info)) {
1223                         console_unlock();
1224                         return -ENODEV;
1225                 }
1226                 info->flags |= FBINFO_MISC_USEREVENT;
1227                 ret = fb_blank(info, arg);
1228                 info->flags &= ~FBINFO_MISC_USEREVENT;
1229                 unlock_fb_info(info);
1230                 console_unlock();
1231                 break;
1232         default:
1233                 if (!lock_fb_info(info))
1234                         return -ENODEV;
1235                 fb = info->fbops;
1236                 if (fb->fb_ioctl)
1237                         ret = fb->fb_ioctl(info, cmd, arg);
1238                 else
1239                         ret = -ENOTTY;
1240                 unlock_fb_info(info);
1241         }
1242         return ret;
1243 }
1244
1245 static long fb_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1246 {
1247         struct fb_info *info = file_fb_info(file);
1248
1249         if (!info)
1250                 return -ENODEV;
1251         return do_fb_ioctl(info, cmd, arg);
1252 }
1253
1254 #ifdef CONFIG_COMPAT
1255 struct fb_fix_screeninfo32 {
1256         char                    id[16];
1257         compat_caddr_t          smem_start;
1258         u32                     smem_len;
1259         u32                     type;
1260         u32                     type_aux;
1261         u32                     visual;
1262         u16                     xpanstep;
1263         u16                     ypanstep;
1264         u16                     ywrapstep;
1265         u32                     line_length;
1266         compat_caddr_t          mmio_start;
1267         u32                     mmio_len;
1268         u32                     accel;
1269         u16                     reserved[3];
1270 };
1271
1272 struct fb_cmap32 {
1273         u32                     start;
1274         u32                     len;
1275         compat_caddr_t  red;
1276         compat_caddr_t  green;
1277         compat_caddr_t  blue;
1278         compat_caddr_t  transp;
1279 };
1280
1281 static int fb_getput_cmap(struct fb_info *info, unsigned int cmd,
1282                           unsigned long arg)
1283 {
1284         struct fb_cmap_user __user *cmap;
1285         struct fb_cmap32 __user *cmap32;
1286         __u32 data;
1287         int err;
1288
1289         cmap = compat_alloc_user_space(sizeof(*cmap));
1290         cmap32 = compat_ptr(arg);
1291
1292         if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1293                 return -EFAULT;
1294
1295         if (get_user(data, &cmap32->red) ||
1296             put_user(compat_ptr(data), &cmap->red) ||
1297             get_user(data, &cmap32->green) ||
1298             put_user(compat_ptr(data), &cmap->green) ||
1299             get_user(data, &cmap32->blue) ||
1300             put_user(compat_ptr(data), &cmap->blue) ||
1301             get_user(data, &cmap32->transp) ||
1302             put_user(compat_ptr(data), &cmap->transp))
1303                 return -EFAULT;
1304
1305         err = do_fb_ioctl(info, cmd, (unsigned long) cmap);
1306
1307         if (!err) {
1308                 if (copy_in_user(&cmap32->start,
1309                                  &cmap->start,
1310                                  2 * sizeof(__u32)))
1311                         err = -EFAULT;
1312         }
1313         return err;
1314 }
1315
1316 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1317                                   struct fb_fix_screeninfo32 __user *fix32)
1318 {
1319         __u32 data;
1320         int err;
1321
1322         err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1323
1324         data = (__u32) (unsigned long) fix->smem_start;
1325         err |= put_user(data, &fix32->smem_start);
1326
1327         err |= put_user(fix->smem_len, &fix32->smem_len);
1328         err |= put_user(fix->type, &fix32->type);
1329         err |= put_user(fix->type_aux, &fix32->type_aux);
1330         err |= put_user(fix->visual, &fix32->visual);
1331         err |= put_user(fix->xpanstep, &fix32->xpanstep);
1332         err |= put_user(fix->ypanstep, &fix32->ypanstep);
1333         err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1334         err |= put_user(fix->line_length, &fix32->line_length);
1335
1336         data = (__u32) (unsigned long) fix->mmio_start;
1337         err |= put_user(data, &fix32->mmio_start);
1338
1339         err |= put_user(fix->mmio_len, &fix32->mmio_len);
1340         err |= put_user(fix->accel, &fix32->accel);
1341         err |= copy_to_user(fix32->reserved, fix->reserved,
1342                             sizeof(fix->reserved));
1343
1344         if (err)
1345                 return -EFAULT;
1346         return 0;
1347 }
1348
1349 static int fb_get_fscreeninfo(struct fb_info *info, unsigned int cmd,
1350                               unsigned long arg)
1351 {
1352         mm_segment_t old_fs;
1353         struct fb_fix_screeninfo fix;
1354         struct fb_fix_screeninfo32 __user *fix32;
1355         int err;
1356
1357         fix32 = compat_ptr(arg);
1358
1359         old_fs = get_fs();
1360         set_fs(KERNEL_DS);
1361         err = do_fb_ioctl(info, cmd, (unsigned long) &fix);
1362         set_fs(old_fs);
1363
1364         if (!err)
1365                 err = do_fscreeninfo_to_user(&fix, fix32);
1366
1367         return err;
1368 }
1369
1370 static long fb_compat_ioctl(struct file *file, unsigned int cmd,
1371                             unsigned long arg)
1372 {
1373         struct fb_info *info = file_fb_info(file);
1374         struct fb_ops *fb;
1375         long ret = -ENOIOCTLCMD;
1376
1377         if (!info)
1378                 return -ENODEV;
1379         fb = info->fbops;
1380         switch(cmd) {
1381         case FBIOGET_VSCREENINFO:
1382         case FBIOPUT_VSCREENINFO:
1383         case FBIOPAN_DISPLAY:
1384         case FBIOGET_CON2FBMAP:
1385         case FBIOPUT_CON2FBMAP:
1386                 arg = (unsigned long) compat_ptr(arg);
1387         case FBIOBLANK:
1388                 ret = do_fb_ioctl(info, cmd, arg);
1389                 break;
1390
1391         case FBIOGET_FSCREENINFO:
1392                 ret = fb_get_fscreeninfo(info, cmd, arg);
1393                 break;
1394
1395         case FBIOGETCMAP:
1396         case FBIOPUTCMAP:
1397                 ret = fb_getput_cmap(info, cmd, arg);
1398                 break;
1399
1400         default:
1401                 if (fb->fb_compat_ioctl)
1402                         ret = fb->fb_compat_ioctl(info, cmd, arg);
1403                 break;
1404         }
1405         return ret;
1406 }
1407 #endif
1408
1409 static int
1410 fb_mmap(struct file *file, struct vm_area_struct * vma)
1411 {
1412         struct fb_info *info = file_fb_info(file);
1413         struct fb_ops *fb;
1414         unsigned long mmio_pgoff;
1415         unsigned long start;
1416         u32 len;
1417
1418         if (!info)
1419                 return -ENODEV;
1420         fb = info->fbops;
1421         if (!fb)
1422                 return -ENODEV;
1423         mutex_lock(&info->mm_lock);
1424         if (fb->fb_mmap) {
1425                 int res;
1426                 res = fb->fb_mmap(info, vma);
1427                 mutex_unlock(&info->mm_lock);
1428                 return res;
1429         }
1430
1431         /*
1432          * Ugh. This can be either the frame buffer mapping, or
1433          * if pgoff points past it, the mmio mapping.
1434          */
1435         start = info->fix.smem_start;
1436         len = info->fix.smem_len;
1437         mmio_pgoff = PAGE_ALIGN((start & ~PAGE_MASK) + len) >> PAGE_SHIFT;
1438         if (vma->vm_pgoff >= mmio_pgoff) {
1439                 if (info->var.accel_flags) {
1440                         mutex_unlock(&info->mm_lock);
1441                         return -EINVAL;
1442                 }
1443
1444                 vma->vm_pgoff -= mmio_pgoff;
1445                 start = info->fix.mmio_start;
1446                 len = info->fix.mmio_len;
1447         }
1448         mutex_unlock(&info->mm_lock);
1449
1450         vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
1451         fb_pgprotect(file, vma, start);
1452
1453         return vm_iomap_memory(vma, start, len);
1454 }
1455
1456 static int
1457 fb_open(struct inode *inode, struct file *file)
1458 __acquires(&info->lock)
1459 __releases(&info->lock)
1460 {
1461         int fbidx = iminor(inode);
1462         struct fb_info *info;
1463         int res = 0;
1464
1465         info = get_fb_info(fbidx);
1466         if (!info) {
1467                 request_module("fb%d", fbidx);
1468                 info = get_fb_info(fbidx);
1469                 if (!info)
1470                         return -ENODEV;
1471         }
1472         if (IS_ERR(info))
1473                 return PTR_ERR(info);
1474
1475         mutex_lock(&info->lock);
1476         if (!try_module_get(info->fbops->owner)) {
1477                 res = -ENODEV;
1478                 goto out;
1479         }
1480         file->private_data = info;
1481         if (info->fbops->fb_open) {
1482                 res = info->fbops->fb_open(info,1);
1483                 if (res)
1484                         module_put(info->fbops->owner);
1485         }
1486 #ifdef CONFIG_FB_DEFERRED_IO
1487         if (info->fbdefio)
1488                 fb_deferred_io_open(info, inode, file);
1489 #endif
1490 out:
1491         mutex_unlock(&info->lock);
1492         if (res)
1493                 put_fb_info(info);
1494         return res;
1495 }
1496
1497 static int
1498 fb_release(struct inode *inode, struct file *file)
1499 __acquires(&info->lock)
1500 __releases(&info->lock)
1501 {
1502         struct fb_info * const info = file->private_data;
1503
1504         mutex_lock(&info->lock);
1505         if (info->fbops->fb_release)
1506                 info->fbops->fb_release(info,1);
1507         module_put(info->fbops->owner);
1508         mutex_unlock(&info->lock);
1509         put_fb_info(info);
1510         return 0;
1511 }
1512
1513 static const struct file_operations fb_fops = {
1514         .owner =        THIS_MODULE,
1515         .read =         fb_read,
1516         .write =        fb_write,
1517         .unlocked_ioctl = fb_ioctl,
1518 #ifdef CONFIG_COMPAT
1519         .compat_ioctl = fb_compat_ioctl,
1520 #endif
1521         .mmap =         fb_mmap,
1522         .open =         fb_open,
1523         .release =      fb_release,
1524 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1525         .get_unmapped_area = get_fb_unmapped_area,
1526 #endif
1527 #ifdef CONFIG_FB_DEFERRED_IO
1528         .fsync =        fb_deferred_io_fsync,
1529 #endif
1530         .llseek =       default_llseek,
1531 };
1532
1533 struct class *fb_class;
1534 EXPORT_SYMBOL(fb_class);
1535
1536 static int fb_check_foreignness(struct fb_info *fi)
1537 {
1538         const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN;
1539
1540         fi->flags &= ~FBINFO_FOREIGN_ENDIAN;
1541
1542 #ifdef __BIG_ENDIAN
1543         fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH;
1544 #else
1545         fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0;
1546 #endif /* __BIG_ENDIAN */
1547
1548         if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) {
1549                 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to "
1550                        "support this framebuffer\n", fi->fix.id);
1551                 return -ENOSYS;
1552         } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) {
1553                 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to "
1554                        "support this framebuffer\n", fi->fix.id);
1555                 return -ENOSYS;
1556         }
1557
1558         return 0;
1559 }
1560
1561 static bool apertures_overlap(struct aperture *gen, struct aperture *hw)
1562 {
1563         /* is the generic aperture base the same as the HW one */
1564         if (gen->base == hw->base)
1565                 return true;
1566         /* is the generic aperture base inside the hw base->hw base+size */
1567         if (gen->base > hw->base && gen->base < hw->base + hw->size)
1568                 return true;
1569         return false;
1570 }
1571
1572 static bool fb_do_apertures_overlap(struct apertures_struct *gena,
1573                                     struct apertures_struct *hwa)
1574 {
1575         int i, j;
1576         if (!hwa || !gena)
1577                 return false;
1578
1579         for (i = 0; i < hwa->count; ++i) {
1580                 struct aperture *h = &hwa->ranges[i];
1581                 for (j = 0; j < gena->count; ++j) {
1582                         struct aperture *g = &gena->ranges[j];
1583                         printk(KERN_DEBUG "checking generic (%llx %llx) vs hw (%llx %llx)\n",
1584                                 (unsigned long long)g->base,
1585                                 (unsigned long long)g->size,
1586                                 (unsigned long long)h->base,
1587                                 (unsigned long long)h->size);
1588                         if (apertures_overlap(g, h))
1589                                 return true;
1590                 }
1591         }
1592
1593         return false;
1594 }
1595
1596 static int do_unregister_framebuffer(struct fb_info *fb_info);
1597
1598 #define VGA_FB_PHYS 0xA0000
1599 static int do_remove_conflicting_framebuffers(struct apertures_struct *a,
1600                                               const char *name, bool primary)
1601 {
1602         int i, ret;
1603
1604         /* check all firmware fbs and kick off if the base addr overlaps */
1605         for (i = 0 ; i < FB_MAX; i++) {
1606                 struct apertures_struct *gen_aper;
1607                 if (!registered_fb[i])
1608                         continue;
1609
1610                 if (!(registered_fb[i]->flags & FBINFO_MISC_FIRMWARE))
1611                         continue;
1612
1613                 gen_aper = registered_fb[i]->apertures;
1614                 if (fb_do_apertures_overlap(gen_aper, a) ||
1615                         (primary && gen_aper && gen_aper->count &&
1616                          gen_aper->ranges[0].base == VGA_FB_PHYS)) {
1617
1618                         printk(KERN_INFO "fb: switching to %s from %s\n",
1619                                name, registered_fb[i]->fix.id);
1620                         ret = do_unregister_framebuffer(registered_fb[i]);
1621                         if (ret)
1622                                 return ret;
1623                 }
1624         }
1625
1626         return 0;
1627 }
1628
1629 static bool lockless_register_fb;
1630 module_param_named_unsafe(lockless_register_fb, lockless_register_fb, bool, 0400);
1631 MODULE_PARM_DESC(lockless_register_fb,
1632         "Lockless framebuffer registration for debugging [default=off]");
1633
1634 static int do_register_framebuffer(struct fb_info *fb_info)
1635 {
1636         int i, ret;
1637         struct fb_event event;
1638         struct fb_videomode mode;
1639
1640         if (fb_check_foreignness(fb_info))
1641                 return -ENOSYS;
1642
1643         ret = do_remove_conflicting_framebuffers(fb_info->apertures,
1644                                                  fb_info->fix.id,
1645                                                  fb_is_primary_device(fb_info));
1646         if (ret)
1647                 return ret;
1648
1649         if (num_registered_fb == FB_MAX)
1650                 return -ENXIO;
1651
1652         num_registered_fb++;
1653         for (i = 0 ; i < FB_MAX; i++)
1654                 if (!registered_fb[i])
1655                         break;
1656         fb_info->node = i;
1657         atomic_set(&fb_info->count, 1);
1658         mutex_init(&fb_info->lock);
1659         mutex_init(&fb_info->mm_lock);
1660
1661         fb_info->dev = device_create(fb_class, fb_info->device,
1662                                      MKDEV(FB_MAJOR, i), NULL, "fb%d", i);
1663         if (IS_ERR(fb_info->dev)) {
1664                 /* Not fatal */
1665                 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1666                 fb_info->dev = NULL;
1667         } else
1668                 fb_init_device(fb_info);
1669
1670         if (fb_info->pixmap.addr == NULL) {
1671                 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1672                 if (fb_info->pixmap.addr) {
1673                         fb_info->pixmap.size = FBPIXMAPSIZE;
1674                         fb_info->pixmap.buf_align = 1;
1675                         fb_info->pixmap.scan_align = 1;
1676                         fb_info->pixmap.access_align = 32;
1677                         fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1678                 }
1679         }
1680         fb_info->pixmap.offset = 0;
1681
1682         if (!fb_info->pixmap.blit_x)
1683                 fb_info->pixmap.blit_x = ~(u32)0;
1684
1685         if (!fb_info->pixmap.blit_y)
1686                 fb_info->pixmap.blit_y = ~(u32)0;
1687
1688         if (!fb_info->modelist.prev || !fb_info->modelist.next)
1689                 INIT_LIST_HEAD(&fb_info->modelist);
1690
1691         if (fb_info->skip_vt_switch)
1692                 pm_vt_switch_required(fb_info->dev, false);
1693         else
1694                 pm_vt_switch_required(fb_info->dev, true);
1695
1696         fb_var_to_videomode(&mode, &fb_info->var);
1697         fb_add_videomode(&mode, &fb_info->modelist);
1698         registered_fb[i] = fb_info;
1699
1700         event.info = fb_info;
1701         if (!lockless_register_fb)
1702                 console_lock();
1703         if (!lock_fb_info(fb_info)) {
1704                 if (!lockless_register_fb)
1705                         console_unlock();
1706                 return -ENODEV;
1707         }
1708
1709         fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1710         unlock_fb_info(fb_info);
1711         if (!lockless_register_fb)
1712                 console_unlock();
1713         return 0;
1714 }
1715
1716 static int unbind_console(struct fb_info *fb_info)
1717 {
1718         struct fb_event event;
1719         int ret;
1720         int i = fb_info->node;
1721
1722         if (i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)
1723                 return -EINVAL;
1724
1725         console_lock();
1726         if (!lock_fb_info(fb_info)) {
1727                 console_unlock();
1728                 return -ENODEV;
1729         }
1730
1731         event.info = fb_info;
1732         ret = fb_notifier_call_chain(FB_EVENT_FB_UNBIND, &event);
1733         unlock_fb_info(fb_info);
1734         console_unlock();
1735
1736         return ret;
1737 }
1738
1739 static int __unlink_framebuffer(struct fb_info *fb_info);
1740
1741 static int do_unregister_framebuffer(struct fb_info *fb_info)
1742 {
1743         struct fb_event event;
1744         int ret;
1745
1746         ret = unbind_console(fb_info);
1747
1748         if (ret)
1749                 return -EINVAL;
1750
1751         pm_vt_switch_unregister(fb_info->dev);
1752
1753         __unlink_framebuffer(fb_info);
1754         if (fb_info->pixmap.addr &&
1755             (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1756                 kfree(fb_info->pixmap.addr);
1757         fb_destroy_modelist(&fb_info->modelist);
1758         registered_fb[fb_info->node] = NULL;
1759         num_registered_fb--;
1760         fb_cleanup_device(fb_info);
1761         event.info = fb_info;
1762         console_lock();
1763         fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1764         console_unlock();
1765
1766         /* this may free fb info */
1767         put_fb_info(fb_info);
1768         return 0;
1769 }
1770
1771 static int __unlink_framebuffer(struct fb_info *fb_info)
1772 {
1773         int i;
1774
1775         i = fb_info->node;
1776         if (i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)
1777                 return -EINVAL;
1778
1779         if (fb_info->dev) {
1780                 device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1781                 fb_info->dev = NULL;
1782         }
1783
1784         return 0;
1785 }
1786
1787 int unlink_framebuffer(struct fb_info *fb_info)
1788 {
1789         int ret;
1790
1791         ret = __unlink_framebuffer(fb_info);
1792         if (ret)
1793                 return ret;
1794
1795         unbind_console(fb_info);
1796
1797         return 0;
1798 }
1799 EXPORT_SYMBOL(unlink_framebuffer);
1800
1801 int remove_conflicting_framebuffers(struct apertures_struct *a,
1802                                     const char *name, bool primary)
1803 {
1804         int ret;
1805
1806         mutex_lock(&registration_lock);
1807         ret = do_remove_conflicting_framebuffers(a, name, primary);
1808         mutex_unlock(&registration_lock);
1809
1810         return ret;
1811 }
1812 EXPORT_SYMBOL(remove_conflicting_framebuffers);
1813
1814 /**
1815  *      register_framebuffer - registers a frame buffer device
1816  *      @fb_info: frame buffer info structure
1817  *
1818  *      Registers a frame buffer device @fb_info.
1819  *
1820  *      Returns negative errno on error, or zero for success.
1821  *
1822  */
1823 int
1824 register_framebuffer(struct fb_info *fb_info)
1825 {
1826         int ret;
1827
1828         mutex_lock(&registration_lock);
1829         ret = do_register_framebuffer(fb_info);
1830         mutex_unlock(&registration_lock);
1831
1832         return ret;
1833 }
1834 EXPORT_SYMBOL(register_framebuffer);
1835
1836 /**
1837  *      unregister_framebuffer - releases a frame buffer device
1838  *      @fb_info: frame buffer info structure
1839  *
1840  *      Unregisters a frame buffer device @fb_info.
1841  *
1842  *      Returns negative errno on error, or zero for success.
1843  *
1844  *      This function will also notify the framebuffer console
1845  *      to release the driver.
1846  *
1847  *      This is meant to be called within a driver's module_exit()
1848  *      function. If this is called outside module_exit(), ensure
1849  *      that the driver implements fb_open() and fb_release() to
1850  *      check that no processes are using the device.
1851  */
1852 int
1853 unregister_framebuffer(struct fb_info *fb_info)
1854 {
1855         int ret;
1856
1857         mutex_lock(&registration_lock);
1858         ret = do_unregister_framebuffer(fb_info);
1859         mutex_unlock(&registration_lock);
1860
1861         return ret;
1862 }
1863 EXPORT_SYMBOL(unregister_framebuffer);
1864
1865 /**
1866  *      fb_set_suspend - low level driver signals suspend
1867  *      @info: framebuffer affected
1868  *      @state: 0 = resuming, !=0 = suspending
1869  *
1870  *      This is meant to be used by low level drivers to
1871  *      signal suspend/resume to the core & clients.
1872  *      It must be called with the console semaphore held
1873  */
1874 void fb_set_suspend(struct fb_info *info, int state)
1875 {
1876         struct fb_event event;
1877
1878         event.info = info;
1879         if (state) {
1880                 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event);
1881                 info->state = FBINFO_STATE_SUSPENDED;
1882         } else {
1883                 info->state = FBINFO_STATE_RUNNING;
1884                 fb_notifier_call_chain(FB_EVENT_RESUME, &event);
1885         }
1886 }
1887 EXPORT_SYMBOL(fb_set_suspend);
1888
1889 /**
1890  *      fbmem_init - init frame buffer subsystem
1891  *
1892  *      Initialize the frame buffer subsystem.
1893  *
1894  *      NOTE: This function is _only_ to be called by drivers/char/mem.c.
1895  *
1896  */
1897
1898 static int __init
1899 fbmem_init(void)
1900 {
1901         int ret;
1902
1903         if (!proc_create("fb", 0, NULL, &fb_proc_fops))
1904                 return -ENOMEM;
1905
1906         ret = register_chrdev(FB_MAJOR, "fb", &fb_fops);
1907         if (ret) {
1908                 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1909                 goto err_chrdev;
1910         }
1911
1912         fb_class = class_create(THIS_MODULE, "graphics");
1913         if (IS_ERR(fb_class)) {
1914                 ret = PTR_ERR(fb_class);
1915                 pr_warn("Unable to create fb class; errno = %d\n", ret);
1916                 fb_class = NULL;
1917                 goto err_class;
1918         }
1919         return 0;
1920
1921 err_class:
1922         unregister_chrdev(FB_MAJOR, "fb");
1923 err_chrdev:
1924         remove_proc_entry("fb", NULL);
1925         return ret;
1926 }
1927
1928 #ifdef MODULE
1929 module_init(fbmem_init);
1930 static void __exit
1931 fbmem_exit(void)
1932 {
1933         remove_proc_entry("fb", NULL);
1934         class_destroy(fb_class);
1935         unregister_chrdev(FB_MAJOR, "fb");
1936 }
1937
1938 module_exit(fbmem_exit);
1939 MODULE_LICENSE("GPL");
1940 MODULE_DESCRIPTION("Framebuffer base");
1941 #else
1942 subsys_initcall(fbmem_init);
1943 #endif
1944
1945 int fb_new_modelist(struct fb_info *info)
1946 {
1947         struct fb_event event;
1948         struct fb_var_screeninfo var = info->var;
1949         struct list_head *pos, *n;
1950         struct fb_modelist *modelist;
1951         struct fb_videomode *m, mode;
1952         int err = 1;
1953
1954         list_for_each_safe(pos, n, &info->modelist) {
1955                 modelist = list_entry(pos, struct fb_modelist, list);
1956                 m = &modelist->mode;
1957                 fb_videomode_to_var(&var, m);
1958                 var.activate = FB_ACTIVATE_TEST;
1959                 err = fb_set_var(info, &var);
1960                 fb_var_to_videomode(&mode, &var);
1961                 if (err || !fb_mode_is_equal(m, &mode)) {
1962                         list_del(pos);
1963                         kfree(pos);
1964                 }
1965         }
1966
1967         err = 1;
1968
1969         if (!list_empty(&info->modelist)) {
1970                 event.info = info;
1971                 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
1972         }
1973
1974         return err;
1975 }
1976
1977 MODULE_LICENSE("GPL");