drivers/video/fbmem.c

   1 /*
   2  *  linux/drivers/video/fbmem.c
   3  *
   4  *  Copyright (C) 1994 Martin Schaller
   5  *
   6  *      2001 - Documented with DocBook
   7  *      - Brad Douglas <brad@neruo.com>
   8  *
   9  * This file is subject to the terms and conditions of the GNU General Public
  10  * License.  See the file COPYING in the main directory of this archive
  11  * for more details.
  12  */
  13
  14 #include <linux/module.h>
  15
  16 #include <linux/compat.h>
  17 #include <linux/types.h>
  18 #include <linux/errno.h>
  19 #include <linux/kernel.h>
  20 #include <linux/major.h>
  21 #include <linux/slab.h>
  22 #include <linux/mm.h>
  23 #include <linux/mman.h>
  24 #include <linux/vt.h>
  25 #include <linux/init.h>
  26 #include <linux/linux_logo.h>
  27 #include <linux/proc_fs.h>
  28 #include <linux/seq_file.h>
  29 #include <linux/console.h>
  30 #include <linux/kmod.h>
  31 #include <linux/err.h>
  32 #include <linux/device.h>
  33 #include <linux/efi.h>
  34 #include <linux/fb.h>
  35
  36 #include <asm/fb.h>
  37
  38
  39     /*
  40      *  Frame buffer device initialization and setup routines
  41      */
  42
  43 #define FBPIXMAPSIZE    (1024 * 8)
  44
  45 struct fb_info *registered_fb[FB_MAX] __read_mostly;
  46 int num_registered_fb __read_mostly;
  47
  48 int lock_fb_info(struct fb_info *info)
  49 {
  50         mutex_lock(&info->lock);
  51         if (!info->fbops) {
  52                 mutex_unlock(&info->lock);
  53                 return 0;
  54         }
  55         return 1;
  56 }
  57 EXPORT_SYMBOL(lock_fb_info);
  58
  59 /*
  60  * Helpers
  61  */
  62
  63 int fb_get_color_depth(struct fb_var_screeninfo *var,
  64                        struct fb_fix_screeninfo *fix)
  65 {
  66         int depth = 0;
  67
  68         if (fix->visual == FB_VISUAL_MONO01 ||
  69             fix->visual == FB_VISUAL_MONO10)
  70                 depth = 1;
  71         else {
  72                 if (var->green.length == var->blue.length &&
  73                     var->green.length == var->red.length &&
  74                     var->green.offset == var->blue.offset &&
  75                     var->green.offset == var->red.offset)
  76                         depth = var->green.length;
  77                 else
  78                         depth = var->green.length + var->red.length +
  79                                 var->blue.length;
  80         }
  81
  82         return depth;
  83 }
  84 EXPORT_SYMBOL(fb_get_color_depth);
  85
  86 /*
  87  * Data padding functions.
  88  */
  89 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
  90 {
  91         __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
  92 }
  93 EXPORT_SYMBOL(fb_pad_aligned_buffer);
  94
  95 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
  96                                 u32 shift_high, u32 shift_low, u32 mod)
  97 {
  98         u8 mask = (u8) (0xfff << shift_high), tmp;
  99         int i, j;
 100
 101         for (i = height; i--; ) {
 102                 for (j = 0; j < idx; j++) {
 103                         tmp = dst[j];
 104                         tmp &= mask;
 105                         tmp |= *src >> shift_low;
 106                         dst[j] = tmp;
 107                         tmp = *src << shift_high;
 108                         dst[j+1] = tmp;
 109                         src++;
 110                 }
 111                 tmp = dst[idx];
 112                 tmp &= mask;
 113                 tmp |= *src >> shift_low;
 114                 dst[idx] = tmp;
 115                 if (shift_high < mod) {
 116                         tmp = *src << shift_high;
 117                         dst[idx+1] = tmp;
 118                 }
 119                 src++;
 120                 dst += d_pitch;
 121         }
 122 }
 123 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
 124
 125 /*
 126  * we need to lock this section since fb_cursor
 127  * may use fb_imageblit()
 128  */
 129 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
 130 {
 131         u32 align = buf->buf_align - 1, offset;
 132         char *addr = buf->addr;
 133
 134         /* If IO mapped, we need to sync before access, no sharing of
 135          * the pixmap is done
 136          */
 137         if (buf->flags & FB_PIXMAP_IO) {
 138                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 139                         info->fbops->fb_sync(info);
 140                 return addr;
 141         }
 142
 143         /* See if we fit in the remaining pixmap space */
 144         offset = buf->offset + align;
 145         offset &= ~align;
 146         if (offset + size > buf->size) {
 147                 /* We do not fit. In order to be able to re-use the buffer,
 148                  * we must ensure no asynchronous DMA'ing or whatever operation
 149                  * is in progress, we sync for that.
 150                  */
 151                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 152                         info->fbops->fb_sync(info);
 153                 offset = 0;
 154         }
 155         buf->offset = offset + size;
 156         addr += offset;
 157
 158         return addr;
 159 }
 160
 161 #ifdef CONFIG_LOGO
 162
 163 static inline unsigned safe_shift(unsigned d, int n)
 164 {
 165         return n < 0 ? d >> -n : d << n;
 166 }
 167
 168 static void fb_set_logocmap(struct fb_info *info,
 169                                    const struct linux_logo *logo)
 170 {
 171         struct fb_cmap palette_cmap;
 172         u16 palette_green[16];
 173         u16 palette_blue[16];
 174         u16 palette_red[16];
 175         int i, j, n;
 176         const unsigned char *clut = logo->clut;
 177
 178         palette_cmap.start = 0;
 179         palette_cmap.len = 16;
 180         palette_cmap.red = palette_red;
 181         palette_cmap.green = palette_green;
 182         palette_cmap.blue = palette_blue;
 183         palette_cmap.transp = NULL;
 184
 185         for (i = 0; i < logo->clutsize; i += n) {
 186                 n = logo->clutsize - i;
 187                 /* palette_cmap provides space for only 16 colors at once */
 188                 if (n > 16)
 189                         n = 16;
 190                 palette_cmap.start = 32 + i;
 191                 palette_cmap.len = n;
 192                 for (j = 0; j < n; ++j) {
 193                         palette_cmap.red[j] = clut[0] << 8 | clut[0];
 194                         palette_cmap.green[j] = clut[1] << 8 | clut[1];
 195                         palette_cmap.blue[j] = clut[2] << 8 | clut[2];
 196                         clut += 3;
 197                 }
 198                 fb_set_cmap(&palette_cmap, info);
 199         }
 200 }
 201
 202 static void  fb_set_logo_truepalette(struct fb_info *info,
 203                                             const struct linux_logo *logo,
 204                                             u32 *palette)
 205 {
 206         static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
 207         unsigned char redmask, greenmask, bluemask;
 208         int redshift, greenshift, blueshift;
 209         int i;
 210         const unsigned char *clut = logo->clut;
 211
 212         /*
 213          * We have to create a temporary palette since console palette is only
 214          * 16 colors long.
 215          */
 216         /* Bug: Doesn't obey msb_right ... (who needs that?) */
 217         redmask   = mask[info->var.red.length   < 8 ? info->var.red.length   : 8];
 218         greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
 219         bluemask  = mask[info->var.blue.length  < 8 ? info->var.blue.length  : 8];
 220         redshift   = info->var.red.offset   - (8 - info->var.red.length);
 221         greenshift = info->var.green.offset - (8 - info->var.green.length);
 222         blueshift  = info->var.blue.offset  - (8 - info->var.blue.length);
 223
 224         for ( i = 0; i < logo->clutsize; i++) {
 225                 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
 226                                  safe_shift((clut[1] & greenmask), greenshift) |
 227                                  safe_shift((clut[2] & bluemask), blueshift));
 228                 clut += 3;
 229         }
 230 }
 231
 232 static void fb_set_logo_directpalette(struct fb_info *info,
 233                                              const struct linux_logo *logo,
 234                                              u32 *palette)
 235 {
 236         int redshift, greenshift, blueshift;
 237         int i;
 238
 239         redshift = info->var.red.offset;
 240         greenshift = info->var.green.offset;
 241         blueshift = info->var.blue.offset;
 242
 243         for (i = 32; i < 32 + logo->clutsize; i++)
 244                 palette[i] = i << redshift | i << greenshift | i << blueshift;
 245 }
 246
 247 static void fb_set_logo(struct fb_info *info,
 248                                const struct linux_logo *logo, u8 *dst,
 249                                int depth)
 250 {
 251         int i, j, k;
 252         const u8 *src = logo->data;
 253         u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
 254         u8 fg = 1, d;
 255
 256         switch (fb_get_color_depth(&info->var, &info->fix)) {
 257         case 1:
 258                 fg = 1;
 259                 break;
 260         case 2:
 261                 fg = 3;
 262                 break;
 263         default:
 264                 fg = 7;
 265                 break;
 266         }
 267
 268         if (info->fix.visual == FB_VISUAL_MONO01 ||
 269             info->fix.visual == FB_VISUAL_MONO10)
 270                 fg = ~((u8) (0xfff << info->var.green.length));
 271
 272         switch (depth) {
 273         case 4:
 274                 for (i = 0; i < logo->height; i++)
 275                         for (j = 0; j < logo->width; src++) {
 276                                 *dst++ = *src >> 4;
 277                                 j++;
 278                                 if (j < logo->width) {
 279                                         *dst++ = *src & 0x0f;
 280                                         j++;
 281                                 }
 282                         }
 283                 break;
 284         case 1:
 285                 for (i = 0; i < logo->height; i++) {
 286                         for (j = 0; j < logo->width; src++) {
 287                                 d = *src ^ xor;
 288                                 for (k = 7; k >= 0; k--) {
 289                                         *dst++ = ((d >> k) & 1) ? fg : 0;
 290                                         j++;
 291                                 }
 292                         }
 293                 }
 294                 break;
 295         }
 296 }
 297
 298 /*
 299  * Three (3) kinds of logo maps exist.  linux_logo_clut224 (>16 colors),
 300  * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors).  Depending on
 301  * the visual format and color depth of the framebuffer, the DAC, the
 302  * pseudo_palette, and the logo data will be adjusted accordingly.
 303  *
 304  * Case 1 - linux_logo_clut224:
 305  * Color exceeds the number of console colors (16), thus we set the hardware DAC
 306  * using fb_set_cmap() appropriately.  The "needs_cmapreset"  flag will be set.
 307  *
 308  * For visuals that require color info from the pseudo_palette, we also construct
 309  * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
 310  * will be set.
 311  *
 312  * Case 2 - linux_logo_vga16:
 313  * The number of colors just matches the console colors, thus there is no need
 314  * to set the DAC or the pseudo_palette.  However, the bitmap is packed, ie,
 315  * each byte contains color information for two pixels (upper and lower nibble).
 316  * To be consistent with fb_imageblit() usage, we therefore separate the two
 317  * nibbles into separate bytes. The "depth" flag will be set to 4.
 318  *
 319  * Case 3 - linux_logo_mono:
 320  * This is similar with Case 2.  Each byte contains information for 8 pixels.
 321  * We isolate each bit and expand each into a byte. The "depth" flag will
 322  * be set to 1.
 323  */
 324 static struct logo_data {
 325         int depth;
 326         int needs_directpalette;
 327         int needs_truepalette;
 328         int needs_cmapreset;
 329         const struct linux_logo *logo;
 330 } fb_logo __read_mostly;
 331
 332 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
 333 {
 334         u32 size = width * height, i;
 335
 336         out += size - 1;
 337
 338         for (i = size; i--; )
 339                 *out-- = *in++;
 340 }
 341
 342 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
 343 {
 344         int i, j, h = height - 1;
 345
 346         for (i = 0; i < height; i++)
 347                 for (j = 0; j < width; j++)
 348                                 out[height * j + h - i] = *in++;
 349 }
 350
 351 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
 352 {
 353         int i, j, w = width - 1;
 354
 355         for (i = 0; i < height; i++)
 356                 for (j = 0; j < width; j++)
 357                         out[height * (w - j) + i] = *in++;
 358 }
 359
 360 static void fb_rotate_logo(struct fb_info *info, u8 *dst,
 361                            struct fb_image *image, int rotate)
 362 {
 363         u32 tmp;
 364
 365         if (rotate == FB_ROTATE_UD) {
 366                 fb_rotate_logo_ud(image->data, dst, image->width,
 367                                   image->height);
 368                 image->dx = info->var.xres - image->width - image->dx;
 369                 image->dy = info->var.yres - image->height - image->dy;
 370         } else if (rotate == FB_ROTATE_CW) {
 371                 fb_rotate_logo_cw(image->data, dst, image->width,
 372                                   image->height);
 373                 tmp = image->width;
 374                 image->width = image->height;
 375                 image->height = tmp;
 376                 tmp = image->dy;
 377                 image->dy = image->dx;
 378                 image->dx = info->var.xres - image->width - tmp;
 379         } else if (rotate == FB_ROTATE_CCW) {
 380                 fb_rotate_logo_ccw(image->data, dst, image->width,
 381                                    image->height);
 382                 tmp = image->width;
 383                 image->width = image->height;
 384                 image->height = tmp;
 385                 tmp = image->dx;
 386                 image->dx = image->dy;
 387                 image->dy = info->var.yres - image->height - tmp;
 388         }
 389
 390         image->data = dst;
 391 }
 392
 393 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
 394                             int rotate, unsigned int num)
 395 {
 396         unsigned int x;
 397
 398         if (rotate == FB_ROTATE_UR) {
 399                 for (x = 0;
 400                      x < num && image->dx + image->width <= info->var.xres;
 401                      x++) {
 402                         info->fbops->fb_imageblit(info, image);
 403                         image->dx += image->width + 8;
 404                 }
 405         } else if (rotate == FB_ROTATE_UD) {
 406                 for (x = 0; x < num && image->dx >= 0; x++) {
 407                         info->fbops->fb_imageblit(info, image);
 408                         image->dx -= image->width + 8;
 409                 }
 410         } else if (rotate == FB_ROTATE_CW) {
 411                 for (x = 0;
 412                      x < num && image->dy + image->height <= info->var.yres;
 413                      x++) {
 414                         info->fbops->fb_imageblit(info, image);
 415                         image->dy += image->height + 8;
 416                 }
 417         } else if (rotate == FB_ROTATE_CCW) {
 418                 for (x = 0; x < num && image->dy >= 0; x++) {
 419                         info->fbops->fb_imageblit(info, image);
 420                         image->dy -= image->height + 8;
 421                 }
 422         }
 423 }
 424
 425 static int fb_show_logo_line(struct fb_info *info, int rotate,
 426                              const struct linux_logo *logo, int y,
 427                              unsigned int n)
 428 {
 429         u32 *palette = NULL, *saved_pseudo_palette = NULL;
 430         unsigned char *logo_new = NULL, *logo_rotate = NULL;
 431         struct fb_image image;
 432
 433         /* Return if the frame buffer is not mapped or suspended */
 434         if (logo == NULL || info->state != FBINFO_STATE_RUNNING ||
 435             info->flags & FBINFO_MODULE)
 436                 return 0;
 437
 438         image.depth = 8;
 439         image.data = logo->data;
 440
 441         if (fb_logo.needs_cmapreset)
 442                 fb_set_logocmap(info, logo);
 443
 444         if (fb_logo.needs_truepalette ||
 445             fb_logo.needs_directpalette) {
 446                 palette = kmalloc(256 * 4, GFP_KERNEL);
 447                 if (palette == NULL)
 448                         return 0;
 449
 450                 if (fb_logo.needs_truepalette)
 451                         fb_set_logo_truepalette(info, logo, palette);
 452                 else
 453                         fb_set_logo_directpalette(info, logo, palette);
 454
 455                 saved_pseudo_palette = info->pseudo_palette;
 456                 info->pseudo_palette = palette;
 457         }
 458
 459         if (fb_logo.depth <= 4) {
 460                 logo_new = kmalloc(logo->width * logo->height, GFP_KERNEL);
 461                 if (logo_new == NULL) {
 462                         kfree(palette);
 463                         if (saved_pseudo_palette)
 464                                 info->pseudo_palette = saved_pseudo_palette;
 465                         return 0;
 466                 }
 467                 image.data = logo_new;
 468                 fb_set_logo(info, logo, logo_new, fb_logo.depth);
 469         }
 470
 471         image.dx = 0;
 472         image.dy = y;
 473         image.width = logo->width;
 474         image.height = logo->height;
 475
 476         if (rotate) {
 477                 logo_rotate = kmalloc(logo->width *
 478                                       logo->height, GFP_KERNEL);
 479                 if (logo_rotate)
 480                         fb_rotate_logo(info, logo_rotate, &image, rotate);
 481         }
 482
 483         fb_do_show_logo(info, &image, rotate, n);
 484
 485         kfree(palette);
 486         if (saved_pseudo_palette != NULL)
 487                 info->pseudo_palette = saved_pseudo_palette;
 488         kfree(logo_new);
 489         kfree(logo_rotate);
 490         return logo->height;
 491 }
 492
 493
 494 #ifdef CONFIG_FB_LOGO_EXTRA
 495
 496 #define FB_LOGO_EX_NUM_MAX 10
 497 static struct logo_data_extra {
 498         const struct linux_logo *logo;
 499         unsigned int n;
 500 } fb_logo_ex[FB_LOGO_EX_NUM_MAX];
 501 static unsigned int fb_logo_ex_num;
 502
 503 void fb_append_extra_logo(const struct linux_logo *logo, unsigned int n)
 504 {
 505         if (!n || fb_logo_ex_num == FB_LOGO_EX_NUM_MAX)
 506                 return;
 507
 508         fb_logo_ex[fb_logo_ex_num].logo = logo;
 509         fb_logo_ex[fb_logo_ex_num].n = n;
 510         fb_logo_ex_num++;
 511 }
 512
 513 static int fb_prepare_extra_logos(struct fb_info *info, unsigned int height,
 514                                   unsigned int yres)
 515 {
 516         unsigned int i;
 517
 518         /* FIXME: logo_ex supports only truecolor fb. */
 519         if (info->fix.visual != FB_VISUAL_TRUECOLOR)
 520                 fb_logo_ex_num = 0;
 521
 522         for (i = 0; i < fb_logo_ex_num; i++) {
 523                 if (fb_logo_ex[i].logo->type != fb_logo.logo->type) {
 524                         fb_logo_ex[i].logo = NULL;
 525                         continue;
 526                 }
 527                 height += fb_logo_ex[i].logo->height;
 528                 if (height > yres) {
 529                         height -= fb_logo_ex[i].logo->height;
 530                         fb_logo_ex_num = i;
 531                         break;
 532                 }
 533         }
 534         return height;
 535 }
 536
 537 static int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
 538 {
 539         unsigned int i;
 540
 541         for (i = 0; i < fb_logo_ex_num; i++)
 542                 y += fb_show_logo_line(info, rotate,
 543                                        fb_logo_ex[i].logo, y, fb_logo_ex[i].n);
 544
 545         return y;
 546 }
 547
 548 #else /* !CONFIG_FB_LOGO_EXTRA */
 549
 550 static inline int fb_prepare_extra_logos(struct fb_info *info,
 551                                          unsigned int height,
 552                                          unsigned int yres)
 553 {
 554         return height;
 555 }
 556
 557 static inline int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
 558 {
 559         return y;
 560 }
 561
 562 #endif /* CONFIG_FB_LOGO_EXTRA */
 563
 564
 565 int fb_prepare_logo(struct fb_info *info, int rotate)
 566 {
 567         int depth = fb_get_color_depth(&info->var, &info->fix);
 568         unsigned int yres;
 569
 570         memset(&fb_logo, 0, sizeof(struct logo_data));
 571
 572         if (info->flags & FBINFO_MISC_TILEBLITTING ||
 573             info->flags & FBINFO_MODULE)
 574                 return 0;
 575
 576         if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
 577                 depth = info->var.blue.length;
 578                 if (info->var.red.length < depth)
 579                         depth = info->var.red.length;
 580                 if (info->var.green.length < depth)
 581                         depth = info->var.green.length;
 582         }
 583
 584         if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) {
 585                 /* assume console colormap */
 586                 depth = 4;
 587         }
 588
 589         /* Return if no suitable logo was found */
 590         fb_logo.logo = fb_find_logo(depth);
 591
 592         if (!fb_logo.logo) {
 593                 return 0;
 594         }
 595
 596         if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
 597                 yres = info->var.yres;
 598         else
 599                 yres = info->var.xres;
 600
 601         if (fb_logo.logo->height > yres) {
 602                 fb_logo.logo = NULL;
 603                 return 0;
 604         }
 605
 606         /* What depth we asked for might be different from what we get */
 607         if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
 608                 fb_logo.depth = 8;
 609         else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
 610                 fb_logo.depth = 4;
 611         else
 612                 fb_logo.depth = 1;
 613
 614
 615         if (fb_logo.depth > 4 && depth > 4) {
 616                 switch (info->fix.visual) {
 617                 case FB_VISUAL_TRUECOLOR:
 618                         fb_logo.needs_truepalette = 1;
 619                         break;
 620                 case FB_VISUAL_DIRECTCOLOR:
 621                         fb_logo.needs_directpalette = 1;
 622                         fb_logo.needs_cmapreset = 1;
 623                         break;
 624                 case FB_VISUAL_PSEUDOCOLOR:
 625                         fb_logo.needs_cmapreset = 1;
 626                         break;
 627                 }
 628         }
 629
 630         return fb_prepare_extra_logos(info, fb_logo.logo->height, yres);
 631 }
 632
 633 int fb_show_logo(struct fb_info *info, int rotate)
 634 {
 635         int y;
 636
 637         y = fb_show_logo_line(info, rotate, fb_logo.logo, 0,
 638                               num_online_cpus());
 639         y = fb_show_extra_logos(info, y, rotate);
 640
 641         return y;
 642 }
 643 #else
 644 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
 645 int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
 646 #endif /* CONFIG_LOGO */
 647
 648 static void *fb_seq_start(struct seq_file *m, loff_t *pos)
 649 {
 650         return (*pos < FB_MAX) ? pos : NULL;
 651 }
 652
 653 static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos)
 654 {
 655         (*pos)++;
 656         return (*pos < FB_MAX) ? pos : NULL;
 657 }
 658
 659 static void fb_seq_stop(struct seq_file *m, void *v)
 660 {
 661 }
 662
 663 static int fb_seq_show(struct seq_file *m, void *v)
 664 {
 665         int i = *(loff_t *)v;
 666         struct fb_info *fi = registered_fb[i];
 667
 668         if (fi)
 669                 seq_printf(m, "%d %s\n", fi->node, fi->fix.id);
 670         return 0;
 671 }
 672
 673 static const struct seq_operations proc_fb_seq_ops = {
 674         .start  = fb_seq_start,
 675         .next   = fb_seq_next,
 676         .stop   = fb_seq_stop,
 677         .show   = fb_seq_show,
 678 };
 679
 680 static int proc_fb_open(struct inode *inode, struct file *file)
 681 {
 682         return seq_open(file, &proc_fb_seq_ops);
 683 }
 684
 685 static const struct file_operations fb_proc_fops = {
 686         .owner          = THIS_MODULE,
 687         .open           = proc_fb_open,
 688         .read           = seq_read,
 689         .llseek         = seq_lseek,
 690         .release        = seq_release,
 691 };
 692
 693 static ssize_t
 694 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 695 {
 696         unsigned long p = *ppos;
 697         struct inode *inode = file->f_path.dentry->d_inode;
 698         int fbidx = iminor(inode);
 699         struct fb_info *info = registered_fb[fbidx];
 700         u8 *buffer, *dst;
 701         u8 __iomem *src;
 702         int c, cnt = 0, err = 0;
 703         unsigned long total_size;
 704
 705         if (!info || ! info->screen_base)
 706                 return -ENODEV;
 707
 708         if (info->state != FBINFO_STATE_RUNNING)
 709                 return -EPERM;
 710
 711         if (info->fbops->fb_read)
 712                 return info->fbops->fb_read(info, buf, count, ppos);
 713
 714         total_size = info->screen_size;
 715
 716         if (total_size == 0)
 717                 total_size = info->fix.smem_len;
 718
 719         if (p >= total_size)
 720                 return 0;
 721
 722         if (count >= total_size)
 723                 count = total_size;
 724
 725         if (count + p > total_size)
 726                 count = total_size - p;
 727
 728         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 729                          GFP_KERNEL);
 730         if (!buffer)
 731                 return -ENOMEM;
 732
 733         src = (u8 __iomem *) (info->screen_base + p);
 734
 735         if (info->fbops->fb_sync)
 736                 info->fbops->fb_sync(info);
 737
 738         while (count) {
 739                 c  = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 740                 dst = buffer;
 741                 fb_memcpy_fromfb(dst, src, c);
 742                 dst += c;
 743                 src += c;
 744
 745                 if (copy_to_user(buf, buffer, c)) {
 746                         err = -EFAULT;
 747                         break;
 748                 }
 749                 *ppos += c;
 750                 buf += c;
 751                 cnt += c;
 752                 count -= c;
 753         }
 754
 755         kfree(buffer);
 756
 757         return (err) ? err : cnt;
 758 }
 759
 760 static ssize_t
 761 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 762 {
 763         unsigned long p = *ppos;
 764         struct inode *inode = file->f_path.dentry->d_inode;
 765         int fbidx = iminor(inode);
 766         struct fb_info *info = registered_fb[fbidx];
 767         u8 *buffer, *src;
 768         u8 __iomem *dst;
 769         int c, cnt = 0, err = 0;
 770         unsigned long total_size;
 771
 772         if (!info || !info->screen_base)
 773                 return -ENODEV;
 774
 775         if (info->state != FBINFO_STATE_RUNNING)
 776                 return -EPERM;
 777
 778         if (info->fbops->fb_write)
 779                 return info->fbops->fb_write(info, buf, count, ppos);
 780
 781         total_size = info->screen_size;
 782
 783         if (total_size == 0)
 784                 total_size = info->fix.smem_len;
 785
 786         if (p > total_size)
 787                 return -EFBIG;
 788
 789         if (count > total_size) {
 790                 err = -EFBIG;
 791                 count = total_size;
 792         }
 793
 794         if (count + p > total_size) {
 795                 if (!err)
 796                         err = -ENOSPC;
 797
 798                 count = total_size - p;
 799         }
 800
 801         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 802                          GFP_KERNEL);
 803         if (!buffer)
 804                 return -ENOMEM;
 805
 806         dst = (u8 __iomem *) (info->screen_base + p);
 807
 808         if (info->fbops->fb_sync)
 809                 info->fbops->fb_sync(info);
 810
 811         while (count) {
 812                 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 813                 src = buffer;
 814
 815                 if (copy_from_user(src, buf, c)) {
 816                         err = -EFAULT;
 817                         break;
 818                 }
 819
 820                 fb_memcpy_tofb(dst, src, c);
 821                 dst += c;
 822                 src += c;
 823                 *ppos += c;
 824                 buf += c;
 825                 cnt += c;
 826                 count -= c;
 827         }
 828
 829         kfree(buffer);
 830
 831         return (cnt) ? cnt : err;
 832 }
 833
 834 int
 835 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
 836 {
 837         struct fb_fix_screeninfo *fix = &info->fix;
 838         unsigned int yres = info->var.yres;
 839         int err = 0;
 840
 841         if (var->yoffset > 0) {
 842                 if (var->vmode & FB_VMODE_YWRAP) {
 843                         if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
 844                                 err = -EINVAL;
 845                         else
 846                                 yres = 0;
 847                 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
 848                         err = -EINVAL;
 849         }
 850
 851         if (var->xoffset > 0 && (!fix->xpanstep ||
 852                                  (var->xoffset % fix->xpanstep)))
 853                 err = -EINVAL;
 854
 855         if (err || !info->fbops->fb_pan_display ||
 856             var->yoffset > info->var.yres_virtual - yres ||
 857             var->xoffset > info->var.xres_virtual - info->var.xres)
 858                 return -EINVAL;
 859
 860         if ((err = info->fbops->fb_pan_display(var, info)))
 861                 return err;
 862         info->var.xoffset = var->xoffset;
 863         info->var.yoffset = var->yoffset;
 864         if (var->vmode & FB_VMODE_YWRAP)
 865                 info->var.vmode |= FB_VMODE_YWRAP;
 866         else
 867                 info->var.vmode &= ~FB_VMODE_YWRAP;
 868         return 0;
 869 }
 870
 871 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var,
 872                          u32 activate)
 873 {
 874         struct fb_event event;
 875         struct fb_blit_caps caps, fbcaps;
 876         int err = 0;
 877
 878         memset(&caps, 0, sizeof(caps));
 879         memset(&fbcaps, 0, sizeof(fbcaps));
 880         caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0;
 881         event.info = info;
 882         event.data = &caps;
 883         fb_notifier_call_chain(FB_EVENT_GET_REQ, &event);
 884         info->fbops->fb_get_caps(info, &fbcaps, var);
 885
 886         if (((fbcaps.x ^ caps.x) & caps.x) ||
 887             ((fbcaps.y ^ caps.y) & caps.y) ||
 888             (fbcaps.len < caps.len))
 889                 err = -EINVAL;
 890
 891         return err;
 892 }
 893
 894 int
 895 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
 896 {
 897         int flags = info->flags;
 898         int ret = 0;
 899
 900         if (var->activate & FB_ACTIVATE_INV_MODE) {
 901                 struct fb_videomode mode1, mode2;
 902
 903                 fb_var_to_videomode(&mode1, var);
 904                 fb_var_to_videomode(&mode2, &info->var);
 905                 /* make sure we don't delete the videomode of current var */
 906                 ret = fb_mode_is_equal(&mode1, &mode2);
 907
 908                 if (!ret) {
 909                     struct fb_event event;
 910
 911                     event.info = info;
 912                     event.data = &mode1;
 913                     ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event);
 914                 }
 915
 916                 if (!ret)
 917                     fb_delete_videomode(&mode1, &info->modelist);
 918
 919
 920                 ret = (ret) ? -EINVAL : 0;
 921                 goto done;
 922         }
 923
 924         if ((var->activate & FB_ACTIVATE_FORCE) ||
 925             memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
 926                 u32 activate = var->activate;
 927
 928                 if (!info->fbops->fb_check_var) {
 929                         *var = info->var;
 930                         goto done;
 931                 }
 932
 933                 ret = info->fbops->fb_check_var(var, info);
 934
 935                 if (ret)
 936                         goto done;
 937
 938                 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
 939                         struct fb_var_screeninfo old_var;
 940                         struct fb_videomode mode;
 941
 942                         if (info->fbops->fb_get_caps) {
 943                                 ret = fb_check_caps(info, var, activate);
 944
 945                                 if (ret)
 946                                         goto done;
 947                         }
 948
 949                         old_var = info->var;
 950                         info->var = *var;
 951
 952                         if (info->fbops->fb_set_par) {
 953                                 ret = info->fbops->fb_set_par(info);
 954
 955                                 if (ret) {
 956                                         info->var = old_var;
 957                                         printk(KERN_WARNING "detected "
 958                                                 "fb_set_par error, "
 959                                                 "error code: %d\n", ret);
 960                                         goto done;
 961                                 }
 962                         }
 963
 964                         fb_pan_display(info, &info->var);
 965                         fb_set_cmap(&info->cmap, info);
 966                         fb_var_to_videomode(&mode, &info->var);
 967
 968                         if (info->modelist.prev && info->modelist.next &&
 969                             !list_empty(&info->modelist))
 970                                 ret = fb_add_videomode(&mode, &info->modelist);
 971
 972                         if (!ret && (flags & FBINFO_MISC_USEREVENT)) {
 973                                 struct fb_event event;
 974                                 int evnt = (activate & FB_ACTIVATE_ALL) ?
 975                                         FB_EVENT_MODE_CHANGE_ALL :
 976                                         FB_EVENT_MODE_CHANGE;
 977
 978                                 info->flags &= ~FBINFO_MISC_USEREVENT;
 979                                 event.info = info;
 980                                 event.data = &mode;
 981                                 fb_notifier_call_chain(evnt, &event);
 982                         }
 983                 }
 984         }
 985
 986  done:
 987         return ret;
 988 }
 989
 990 int
 991 fb_blank(struct fb_info *info, int blank)
 992 {
 993         int ret = -EINVAL;
 994
 995         if (blank > FB_BLANK_POWERDOWN)
 996                 blank = FB_BLANK_POWERDOWN;
 997
 998         if (info->fbops->fb_blank)
 999                 ret = info->fbops->fb_blank(blank, info);
1000
1001         if (!ret) {
1002                 struct fb_event event;
1003
1004                 event.info = info;
1005                 event.data = &blank;
1006                 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
1007         }
1008
1009         return ret;
1010 }
1011
1012 static long do_fb_ioctl(struct fb_info *info, unsigned int cmd,
1013                         unsigned long arg)
1014 {
1015         struct fb_ops *fb;
1016         struct fb_var_screeninfo var;
1017         struct fb_fix_screeninfo fix;
1018         struct fb_con2fbmap con2fb;
1019         struct fb_cmap cmap_from;
1020         struct fb_cmap_user cmap;
1021         struct fb_event event;
1022         void __user *argp = (void __user *)arg;
1023         long ret = 0;
1024
1025         switch (cmd) {
1026         case FBIOGET_VSCREENINFO:
1027                 if (!lock_fb_info(info))
1028                         return -ENODEV;
1029                 var = info->var;
1030                 unlock_fb_info(info);
1031
1032                 ret = copy_to_user(argp, &var, sizeof(var)) ? -EFAULT : 0;
1033                 break;
1034         case FBIOPUT_VSCREENINFO:
1035                 if (copy_from_user(&var, argp, sizeof(var)))
1036                         return -EFAULT;
1037                 if (!lock_fb_info(info))
1038                         return -ENODEV;
1039                 acquire_console_sem();
1040                 info->flags |= FBINFO_MISC_USEREVENT;
1041                 ret = fb_set_var(info, &var);
1042                 info->flags &= ~FBINFO_MISC_USEREVENT;
1043                 release_console_sem();
1044                 unlock_fb_info(info);
1045                 if (!ret && copy_to_user(argp, &var, sizeof(var)))
1046                         ret = -EFAULT;
1047                 break;
1048         case FBIOGET_FSCREENINFO:
1049                 if (!lock_fb_info(info))
1050                         return -ENODEV;
1051                 fix = info->fix;
1052                 unlock_fb_info(info);
1053
1054                 ret = copy_to_user(argp, &fix, sizeof(fix)) ? -EFAULT : 0;
1055                 break;
1056         case FBIOPUTCMAP:
1057                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1058                         return -EFAULT;
1059                 ret = fb_set_user_cmap(&cmap, info);
1060                 break;
1061         case FBIOGETCMAP:
1062                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1063                         return -EFAULT;
1064                 if (!lock_fb_info(info))
1065                         return -ENODEV;
1066                 cmap_from = info->cmap;
1067                 unlock_fb_info(info);
1068                 ret = fb_cmap_to_user(&cmap_from, &cmap);
1069                 break;
1070         case FBIOPAN_DISPLAY:
1071                 if (copy_from_user(&var, argp, sizeof(var)))
1072                         return -EFAULT;
1073                 if (!lock_fb_info(info))
1074                         return -ENODEV;
1075                 acquire_console_sem();
1076                 ret = fb_pan_display(info, &var);
1077                 release_console_sem();
1078                 unlock_fb_info(info);
1079                 if (ret == 0 && copy_to_user(argp, &var, sizeof(var)))
1080                         return -EFAULT;
1081                 break;
1082         case FBIO_CURSOR:
1083                 ret = -EINVAL;
1084                 break;
1085         case FBIOGET_CON2FBMAP:
1086                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1087                         return -EFAULT;
1088                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1089                         return -EINVAL;
1090                 con2fb.framebuffer = -1;
1091                 event.data = &con2fb;
1092                 if (!lock_fb_info(info))
1093                         return -ENODEV;
1094                 event.info = info;
1095                 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
1096                 unlock_fb_info(info);
1097                 ret = copy_to_user(argp, &con2fb, sizeof(con2fb)) ? -EFAULT : 0;
1098                 break;
1099         case FBIOPUT_CON2FBMAP:
1100                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1101                         return -EFAULT;
1102                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1103                         return -EINVAL;
1104                 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
1105                         return -EINVAL;
1106                 if (!registered_fb[con2fb.framebuffer])
1107                         request_module("fb%d", con2fb.framebuffer);
1108                 if (!registered_fb[con2fb.framebuffer]) {
1109                         ret = -EINVAL;
1110                         break;
1111                 }
1112                 event.data = &con2fb;
1113                 if (!lock_fb_info(info))
1114                         return -ENODEV;
1115                 event.info = info;
1116                 ret = fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP, &event);
1117                 unlock_fb_info(info);
1118                 break;
1119         case FBIOBLANK:
1120                 if (!lock_fb_info(info))
1121                         return -ENODEV;
1122                 acquire_console_sem();
1123                 info->flags |= FBINFO_MISC_USEREVENT;
1124                 ret = fb_blank(info, arg);
1125                 info->flags &= ~FBINFO_MISC_USEREVENT;
1126                 release_console_sem();
1127                 unlock_fb_info(info);
1128                 break;
1129         default:
1130                 if (!lock_fb_info(info))
1131                         return -ENODEV;
1132                 fb = info->fbops;
1133                 if (fb->fb_ioctl)
1134                         ret = fb->fb_ioctl(info, cmd, arg);
1135                 else
1136                         ret = -ENOTTY;
1137                 unlock_fb_info(info);
1138         }
1139         return ret;
1140 }
1141
1142 static long fb_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1143 {
1144         struct inode *inode = file->f_path.dentry->d_inode;
1145         int fbidx = iminor(inode);
1146         struct fb_info *info = registered_fb[fbidx];
1147
1148         return do_fb_ioctl(info, cmd, arg);
1149 }
1150
1151 #ifdef CONFIG_COMPAT
1152 struct fb_fix_screeninfo32 {
1153         char                    id[16];
1154         compat_caddr_t          smem_start;
1155         u32                     smem_len;
1156         u32                     type;
1157         u32                     type_aux;
1158         u32                     visual;
1159         u16                     xpanstep;
1160         u16                     ypanstep;
1161         u16                     ywrapstep;
1162         u32                     line_length;
1163         compat_caddr_t          mmio_start;
1164         u32                     mmio_len;
1165         u32                     accel;
1166         u16                     reserved[3];
1167 };
1168
1169 struct fb_cmap32 {
1170         u32                     start;
1171         u32                     len;
1172         compat_caddr_t  red;
1173         compat_caddr_t  green;
1174         compat_caddr_t  blue;
1175         compat_caddr_t  transp;
1176 };
1177
1178 static int fb_getput_cmap(struct fb_info *info, unsigned int cmd,
1179                           unsigned long arg)
1180 {
1181         struct fb_cmap_user __user *cmap;
1182         struct fb_cmap32 __user *cmap32;
1183         __u32 data;
1184         int err;
1185
1186         cmap = compat_alloc_user_space(sizeof(*cmap));
1187         cmap32 = compat_ptr(arg);
1188
1189         if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1190                 return -EFAULT;
1191
1192         if (get_user(data, &cmap32->red) ||
1193             put_user(compat_ptr(data), &cmap->red) ||
1194             get_user(data, &cmap32->green) ||
1195             put_user(compat_ptr(data), &cmap->green) ||
1196             get_user(data, &cmap32->blue) ||
1197             put_user(compat_ptr(data), &cmap->blue) ||
1198             get_user(data, &cmap32->transp) ||
1199             put_user(compat_ptr(data), &cmap->transp))
1200                 return -EFAULT;
1201
1202         err = do_fb_ioctl(info, cmd, (unsigned long) cmap);
1203
1204         if (!err) {
1205                 if (copy_in_user(&cmap32->start,
1206                                  &cmap->start,
1207                                  2 * sizeof(__u32)))
1208                         err = -EFAULT;
1209         }
1210         return err;
1211 }
1212
1213 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1214                                   struct fb_fix_screeninfo32 __user *fix32)
1215 {
1216         __u32 data;
1217         int err;
1218
1219         err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1220
1221         data = (__u32) (unsigned long) fix->smem_start;
1222         err |= put_user(data, &fix32->smem_start);
1223
1224         err |= put_user(fix->smem_len, &fix32->smem_len);
1225         err |= put_user(fix->type, &fix32->type);
1226         err |= put_user(fix->type_aux, &fix32->type_aux);
1227         err |= put_user(fix->visual, &fix32->visual);
1228         err |= put_user(fix->xpanstep, &fix32->xpanstep);
1229         err |= put_user(fix->ypanstep, &fix32->ypanstep);
1230         err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1231         err |= put_user(fix->line_length, &fix32->line_length);
1232
1233         data = (__u32) (unsigned long) fix->mmio_start;
1234         err |= put_user(data, &fix32->mmio_start);
1235
1236         err |= put_user(fix->mmio_len, &fix32->mmio_len);
1237         err |= put_user(fix->accel, &fix32->accel);
1238         err |= copy_to_user(fix32->reserved, fix->reserved,
1239                             sizeof(fix->reserved));
1240
1241         return err;
1242 }
1243
1244 static int fb_get_fscreeninfo(struct fb_info *info, unsigned int cmd,
1245                               unsigned long arg)
1246 {
1247         mm_segment_t old_fs;
1248         struct fb_fix_screeninfo fix;
1249         struct fb_fix_screeninfo32 __user *fix32;
1250         int err;
1251
1252         fix32 = compat_ptr(arg);
1253
1254         old_fs = get_fs();
1255         set_fs(KERNEL_DS);
1256         err = do_fb_ioctl(info, cmd, (unsigned long) &fix);
1257         set_fs(old_fs);
1258
1259         if (!err)
1260                 err = do_fscreeninfo_to_user(&fix, fix32);
1261
1262         return err;
1263 }
1264
1265 static long fb_compat_ioctl(struct file *file, unsigned int cmd,
1266                             unsigned long arg)
1267 {
1268         struct inode *inode = file->f_path.dentry->d_inode;
1269         int fbidx = iminor(inode);
1270         struct fb_info *info = registered_fb[fbidx];
1271         struct fb_ops *fb = info->fbops;
1272         long ret = -ENOIOCTLCMD;
1273
1274         switch(cmd) {
1275         case FBIOGET_VSCREENINFO:
1276         case FBIOPUT_VSCREENINFO:
1277         case FBIOPAN_DISPLAY:
1278         case FBIOGET_CON2FBMAP:
1279         case FBIOPUT_CON2FBMAP:
1280                 arg = (unsigned long) compat_ptr(arg);
1281         case FBIOBLANK:
1282                 ret = do_fb_ioctl(info, cmd, arg);
1283                 break;
1284
1285         case FBIOGET_FSCREENINFO:
1286                 ret = fb_get_fscreeninfo(info, cmd, arg);
1287                 break;
1288
1289         case FBIOGETCMAP:
1290         case FBIOPUTCMAP:
1291                 ret = fb_getput_cmap(info, cmd, arg);
1292                 break;
1293
1294         default:
1295                 if (fb->fb_compat_ioctl)
1296                         ret = fb->fb_compat_ioctl(info, cmd, arg);
1297                 break;
1298         }
1299         return ret;
1300 }
1301 #endif
1302
1303 static int
1304 fb_mmap(struct file *file, struct vm_area_struct * vma)
1305 {
1306         int fbidx = iminor(file->f_path.dentry->d_inode);
1307         struct fb_info *info = registered_fb[fbidx];
1308         struct fb_ops *fb = info->fbops;
1309         unsigned long off;
1310         unsigned long start;
1311         u32 len;
1312
1313         if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
1314                 return -EINVAL;
1315         off = vma->vm_pgoff << PAGE_SHIFT;
1316         if (!fb)
1317                 return -ENODEV;
1318         mutex_lock(&info->mm_lock);
1319         if (fb->fb_mmap) {
1320                 int res;
1321                 res = fb->fb_mmap(info, vma);
1322                 mutex_unlock(&info->mm_lock);
1323                 return res;
1324         }
1325
1326         /* frame buffer memory */
1327         start = info->fix.smem_start;
1328         len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
1329         if (off >= len) {
1330                 /* memory mapped io */
1331                 off -= len;
1332                 if (info->var.accel_flags) {
1333                         mutex_unlock(&info->mm_lock);
1334                         return -EINVAL;
1335                 }
1336                 start = info->fix.mmio_start;
1337                 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
1338         }
1339         mutex_unlock(&info->mm_lock);
1340         start &= PAGE_MASK;
1341         if ((vma->vm_end - vma->vm_start + off) > len)
1342                 return -EINVAL;
1343         off += start;
1344         vma->vm_pgoff = off >> PAGE_SHIFT;
1345         /* This is an IO map - tell maydump to skip this VMA */
1346         vma->vm_flags |= VM_IO | VM_RESERVED;
1347         vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
1348         fb_pgprotect(file, vma, off);
1349         if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1350                              vma->vm_end - vma->vm_start, vma->vm_page_prot))
1351                 return -EAGAIN;
1352         return 0;
1353 }
1354
1355 static int
1356 fb_open(struct inode *inode, struct file *file)
1357 __acquires(&info->lock)
1358 __releases(&info->lock)
1359 {
1360         int fbidx = iminor(inode);
1361         struct fb_info *info;
1362         int res = 0;
1363
1364         if (fbidx >= FB_MAX)
1365                 return -ENODEV;
1366         info = registered_fb[fbidx];
1367         if (!info)
1368                 request_module("fb%d", fbidx);
1369         info = registered_fb[fbidx];
1370         if (!info)
1371                 return -ENODEV;
1372         mutex_lock(&info->lock);
1373         if (!try_module_get(info->fbops->owner)) {
1374                 res = -ENODEV;
1375                 goto out;
1376         }
1377         file->private_data = info;
1378         if (info->fbops->fb_open) {
1379                 res = info->fbops->fb_open(info,1);
1380                 if (res)
1381                         module_put(info->fbops->owner);
1382         }
1383 #ifdef CONFIG_FB_DEFERRED_IO
1384         if (info->fbdefio)
1385                 fb_deferred_io_open(info, inode, file);
1386 #endif
1387 out:
1388         mutex_unlock(&info->lock);
1389         return res;
1390 }
1391
1392 static int
1393 fb_release(struct inode *inode, struct file *file)
1394 __acquires(&info->lock)
1395 __releases(&info->lock)
1396 {
1397         struct fb_info * const info = file->private_data;
1398
1399         mutex_lock(&info->lock);
1400         if (info->fbops->fb_release)
1401                 info->fbops->fb_release(info,1);
1402         module_put(info->fbops->owner);
1403         mutex_unlock(&info->lock);
1404         return 0;
1405 }
1406
1407 static const struct file_operations fb_fops = {
1408         .owner =        THIS_MODULE,
1409         .read =         fb_read,
1410         .write =        fb_write,
1411         .unlocked_ioctl = fb_ioctl,
1412 #ifdef CONFIG_COMPAT
1413         .compat_ioctl = fb_compat_ioctl,
1414 #endif
1415         .mmap =         fb_mmap,
1416         .open =         fb_open,
1417         .release =      fb_release,
1418 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1419         .get_unmapped_area = get_fb_unmapped_area,
1420 #endif
1421 #ifdef CONFIG_FB_DEFERRED_IO
1422         .fsync =        fb_deferred_io_fsync,
1423 #endif
1424         .llseek =       default_llseek,
1425 };
1426
1427 struct class *fb_class;
1428 EXPORT_SYMBOL(fb_class);
1429
1430 static int fb_check_foreignness(struct fb_info *fi)
1431 {
1432         const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN;
1433
1434         fi->flags &= ~FBINFO_FOREIGN_ENDIAN;
1435
1436 #ifdef __BIG_ENDIAN
1437         fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH;
1438 #else
1439         fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0;
1440 #endif /* __BIG_ENDIAN */
1441
1442         if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) {
1443                 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to "
1444                        "support this framebuffer\n", fi->fix.id);
1445                 return -ENOSYS;
1446         } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) {
1447                 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to "
1448                        "support this framebuffer\n", fi->fix.id);
1449                 return -ENOSYS;
1450         }
1451
1452         return 0;
1453 }
1454
1455 static bool apertures_overlap(struct aperture *gen, struct aperture *hw)
1456 {
1457         /* is the generic aperture base the same as the HW one */
1458         if (gen->base == hw->base)
1459                 return true;
1460         /* is the generic aperture base inside the hw base->hw base+size */
1461         if (gen->base > hw->base && gen->base <= hw->base + hw->size)
1462                 return true;
1463         return false;
1464 }
1465
1466 static bool fb_do_apertures_overlap(struct apertures_struct *gena,
1467                                     struct apertures_struct *hwa)
1468 {
1469         int i, j;
1470         if (!hwa || !gena)
1471                 return false;
1472
1473         for (i = 0; i < hwa->count; ++i) {
1474                 struct aperture *h = &hwa->ranges[i];
1475                 for (j = 0; j < gena->count; ++j) {
1476                         struct aperture *g = &gena->ranges[j];
1477                         printk(KERN_DEBUG "checking generic (%llx %llx) vs hw (%llx %llx)\n",
1478                                 (unsigned long long)g->base,
1479                                 (unsigned long long)g->size,
1480                                 (unsigned long long)h->base,
1481                                 (unsigned long long)h->size);
1482                         if (apertures_overlap(g, h))
1483                                 return true;
1484                 }
1485         }
1486
1487         return false;
1488 }
1489
1490 #define VGA_FB_PHYS 0xA0000
1491 void remove_conflicting_framebuffers(struct apertures_struct *a,
1492                                      const char *name, bool primary)
1493 {
1494         int i;
1495
1496         /* check all firmware fbs and kick off if the base addr overlaps */
1497         for (i = 0 ; i < FB_MAX; i++) {
1498                 struct apertures_struct *gen_aper;
1499                 if (!registered_fb[i])
1500                         continue;
1501
1502                 if (!(registered_fb[i]->flags & FBINFO_MISC_FIRMWARE))
1503                         continue;
1504
1505                 gen_aper = registered_fb[i]->apertures;
1506                 if (fb_do_apertures_overlap(gen_aper, a) ||
1507                         (primary && gen_aper && gen_aper->count &&
1508                          gen_aper->ranges[0].base == VGA_FB_PHYS)) {
1509
1510                         printk(KERN_ERR "fb: conflicting fb hw usage "
1511                                "%s vs %s - removing generic driver\n",
1512                                name, registered_fb[i]->fix.id);
1513                         unregister_framebuffer(registered_fb[i]);
1514                 }
1515         }
1516 }
1517 EXPORT_SYMBOL(remove_conflicting_framebuffers);
1518
1519 /**
1520  *      register_framebuffer - registers a frame buffer device
1521  *      @fb_info: frame buffer info structure
1522  *
1523  *      Registers a frame buffer device @fb_info.
1524  *
1525  *      Returns negative errno on error, or zero for success.
1526  *
1527  */
1528
1529 int
1530 register_framebuffer(struct fb_info *fb_info)
1531 {
1532         int i;
1533         struct fb_event event;
1534         struct fb_videomode mode;
1535
1536         if (num_registered_fb == FB_MAX)
1537                 return -ENXIO;
1538
1539         if (fb_check_foreignness(fb_info))
1540                 return -ENOSYS;
1541
1542         remove_conflicting_framebuffers(fb_info->apertures, fb_info->fix.id,
1543                                          fb_is_primary_device(fb_info));
1544
1545         num_registered_fb++;
1546         for (i = 0 ; i < FB_MAX; i++)
1547                 if (!registered_fb[i])
1548                         break;
1549         fb_info->node = i;
1550         mutex_init(&fb_info->lock);
1551         mutex_init(&fb_info->mm_lock);
1552
1553         fb_info->dev = device_create(fb_class, fb_info->device,
1554                                      MKDEV(FB_MAJOR, i), NULL, "fb%d", i);
1555         if (IS_ERR(fb_info->dev)) {
1556                 /* Not fatal */
1557                 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1558                 fb_info->dev = NULL;
1559         } else
1560                 fb_init_device(fb_info);
1561
1562         if (fb_info->pixmap.addr == NULL) {
1563                 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1564                 if (fb_info->pixmap.addr) {
1565                         fb_info->pixmap.size = FBPIXMAPSIZE;
1566                         fb_info->pixmap.buf_align = 1;
1567                         fb_info->pixmap.scan_align = 1;
1568                         fb_info->pixmap.access_align = 32;
1569                         fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1570                 }
1571         }
1572         fb_info->pixmap.offset = 0;
1573
1574         if (!fb_info->pixmap.blit_x)
1575                 fb_info->pixmap.blit_x = ~(u32)0;
1576
1577         if (!fb_info->pixmap.blit_y)
1578                 fb_info->pixmap.blit_y = ~(u32)0;
1579
1580         if (!fb_info->modelist.prev || !fb_info->modelist.next)
1581                 INIT_LIST_HEAD(&fb_info->modelist);
1582
1583         fb_var_to_videomode(&mode, &fb_info->var);
1584         fb_add_videomode(&mode, &fb_info->modelist);
1585         registered_fb[i] = fb_info;
1586
1587         event.info = fb_info;
1588         if (!lock_fb_info(fb_info))
1589                 return -ENODEV;
1590         fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1591         unlock_fb_info(fb_info);
1592         return 0;
1593 }
1594
1595
1596 /**
1597  *      unregister_framebuffer - releases a frame buffer device
1598  *      @fb_info: frame buffer info structure
1599  *
1600  *      Unregisters a frame buffer device @fb_info.
1601  *
1602  *      Returns negative errno on error, or zero for success.
1603  *
1604  *      This function will also notify the framebuffer console
1605  *      to release the driver.
1606  *
1607  *      This is meant to be called within a driver's module_exit()
1608  *      function. If this is called outside module_exit(), ensure
1609  *      that the driver implements fb_open() and fb_release() to
1610  *      check that no processes are using the device.
1611  */
1612
1613 int
1614 unregister_framebuffer(struct fb_info *fb_info)
1615 {
1616         struct fb_event event;
1617         int i, ret = 0;
1618
1619         i = fb_info->node;
1620         if (!registered_fb[i]) {
1621                 ret = -EINVAL;
1622                 goto done;
1623         }
1624
1625
1626         if (!lock_fb_info(fb_info))
1627                 return -ENODEV;
1628         event.info = fb_info;
1629         ret = fb_notifier_call_chain(FB_EVENT_FB_UNBIND, &event);
1630         unlock_fb_info(fb_info);
1631
1632         if (ret) {
1633                 ret = -EINVAL;
1634                 goto done;
1635         }
1636
1637         if (fb_info->pixmap.addr &&
1638             (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1639                 kfree(fb_info->pixmap.addr);
1640         fb_destroy_modelist(&fb_info->modelist);
1641         registered_fb[i]=NULL;
1642         num_registered_fb--;
1643         fb_cleanup_device(fb_info);
1644         device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1645         event.info = fb_info;
1646         fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1647
1648         /* this may free fb info */
1649         if (fb_info->fbops->fb_destroy)
1650                 fb_info->fbops->fb_destroy(fb_info);
1651 done:
1652         return ret;
1653 }
1654
1655 /**
1656  *      fb_set_suspend - low level driver signals suspend
1657  *      @info: framebuffer affected
1658  *      @state: 0 = resuming, !=0 = suspending
1659  *
1660  *      This is meant to be used by low level drivers to
1661  *      signal suspend/resume to the core & clients.
1662  *      It must be called with the console semaphore held
1663  */
1664 void fb_set_suspend(struct fb_info *info, int state)
1665 {
1666         struct fb_event event;
1667
1668         if (!lock_fb_info(info))
1669                 return;
1670         event.info = info;
1671         if (state) {
1672                 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event);
1673                 info->state = FBINFO_STATE_SUSPENDED;
1674         } else {
1675                 info->state = FBINFO_STATE_RUNNING;
1676                 fb_notifier_call_chain(FB_EVENT_RESUME, &event);
1677         }
1678         unlock_fb_info(info);
1679 }
1680
1681 /**
1682  *      fbmem_init - init frame buffer subsystem
1683  *
1684  *      Initialize the frame buffer subsystem.
1685  *
1686  *      NOTE: This function is _only_ to be called by drivers/char/mem.c.
1687  *
1688  */
1689
1690 static int __init
1691 fbmem_init(void)
1692 {
1693         proc_create("fb", 0, NULL, &fb_proc_fops);
1694
1695         if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1696                 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1697
1698         fb_class = class_create(THIS_MODULE, "graphics");
1699         if (IS_ERR(fb_class)) {
1700                 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1701                 fb_class = NULL;
1702         }
1703         return 0;
1704 }
1705
1706 #ifdef MODULE
1707 module_init(fbmem_init);
1708 static void __exit
1709 fbmem_exit(void)
1710 {
1711         remove_proc_entry("fb", NULL);
1712         class_destroy(fb_class);
1713         unregister_chrdev(FB_MAJOR, "fb");
1714 }
1715
1716 module_exit(fbmem_exit);
1717 MODULE_LICENSE("GPL");
1718 MODULE_DESCRIPTION("Framebuffer base");
1719 #else
1720 subsys_initcall(fbmem_init);
1721 #endif
1722
1723 int fb_new_modelist(struct fb_info *info)
1724 {
1725         struct fb_event event;
1726         struct fb_var_screeninfo var = info->var;
1727         struct list_head *pos, *n;
1728         struct fb_modelist *modelist;
1729         struct fb_videomode *m, mode;
1730         int err = 1;
1731
1732         list_for_each_safe(pos, n, &info->modelist) {
1733                 modelist = list_entry(pos, struct fb_modelist, list);
1734                 m = &modelist->mode;
1735                 fb_videomode_to_var(&var, m);
1736                 var.activate = FB_ACTIVATE_TEST;
1737                 err = fb_set_var(info, &var);
1738                 fb_var_to_videomode(&mode, &var);
1739                 if (err || !fb_mode_is_equal(m, &mode)) {
1740                         list_del(pos);
1741                         kfree(pos);
1742                 }
1743         }
1744
1745         err = 1;
1746
1747         if (!list_empty(&info->modelist)) {
1748                 if (!lock_fb_info(info))
1749                         return -ENODEV;
1750                 event.info = info;
1751                 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
1752                 unlock_fb_info(info);
1753         }
1754
1755         return err;
1756 }
1757
1758 static char *video_options[FB_MAX] __read_mostly;
1759 static int ofonly __read_mostly;
1760
1761 /**
1762  * fb_get_options - get kernel boot parameters
1763  * @name:   framebuffer name as it would appear in
1764  *          the boot parameter line
1765  *          (video=<name>:<options>)
1766  * @option: the option will be stored here
1767  *
1768  * NOTE: Needed to maintain backwards compatibility
1769  */
1770 int fb_get_options(char *name, char **option)
1771 {
1772         char *opt, *options = NULL;
1773         int retval = 0;
1774         int name_len = strlen(name), i;
1775
1776         if (name_len && ofonly && strncmp(name, "offb", 4))
1777                 retval = 1;
1778
1779         if (name_len && !retval) {
1780                 for (i = 0; i < FB_MAX; i++) {
1781                         if (video_options[i] == NULL)
1782                                 continue;
1783                         if (!video_options[i][0])
1784                                 continue;
1785                         opt = video_options[i];
1786                         if (!strncmp(name, opt, name_len) &&
1787                             opt[name_len] == ':')
1788                                 options = opt + name_len + 1;
1789                 }
1790         }
1791         if (options && !strncmp(options, "off", 3))
1792                 retval = 1;
1793
1794         if (option)
1795                 *option = options;
1796
1797         return retval;
1798 }
1799
1800 #ifndef MODULE
1801 /**
1802  *      video_setup - process command line options
1803  *      @options: string of options
1804  *
1805  *      Process command line options for frame buffer subsystem.
1806  *
1807  *      NOTE: This function is a __setup and __init function.
1808  *            It only stores the options.  Drivers have to call
1809  *            fb_get_options() as necessary.
1810  *
1811  *      Returns zero.
1812  *
1813  */
1814 static int __init video_setup(char *options)
1815 {
1816         int i, global = 0;
1817
1818         if (!options || !*options)
1819                 global = 1;
1820
1821         if (!global && !strncmp(options, "ofonly", 6)) {
1822                 ofonly = 1;
1823                 global = 1;
1824         }
1825
1826         if (!global && !strchr(options, ':')) {
1827                 fb_mode_option = options;
1828                 global = 1;
1829         }
1830
1831         if (!global) {
1832                 for (i = 0; i < FB_MAX; i++) {
1833                         if (video_options[i] == NULL) {
1834                                 video_options[i] = options;
1835                                 break;
1836                         }
1837
1838                 }
1839         }
1840
1841         return 1;
1842 }
1843 __setup("video=", video_setup);
1844 #endif
1845
1846     /*
1847      *  Visible symbols for modules
1848      */
1849
1850 EXPORT_SYMBOL(register_framebuffer);
1851 EXPORT_SYMBOL(unregister_framebuffer);
1852 EXPORT_SYMBOL(num_registered_fb);
1853 EXPORT_SYMBOL(registered_fb);
1854 EXPORT_SYMBOL(fb_show_logo);
1855 EXPORT_SYMBOL(fb_set_var);
1856 EXPORT_SYMBOL(fb_blank);
1857 EXPORT_SYMBOL(fb_pan_display);
1858 EXPORT_SYMBOL(fb_get_buffer_offset);
1859 EXPORT_SYMBOL(fb_set_suspend);
1860 EXPORT_SYMBOL(fb_get_options);
1861
1862 MODULE_LICENSE("GPL");