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         u32 *buffer, *dst;
 701         u32 __iomem *src;
 702         int c, i, 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 = (u32 __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                 for (i = c >> 2; i--; )
 742                         *dst++ = fb_readl(src++);
 743                 if (c & 3) {
 744                         u8 *dst8 = (u8 *) dst;
 745                         u8 __iomem *src8 = (u8 __iomem *) src;
 746
 747                         for (i = c & 3; i--;)
 748                                 *dst8++ = fb_readb(src8++);
 749
 750                         src = (u32 __iomem *) src8;
 751                 }
 752
 753                 if (copy_to_user(buf, buffer, c)) {
 754                         err = -EFAULT;
 755                         break;
 756                 }
 757                 *ppos += c;
 758                 buf += c;
 759                 cnt += c;
 760                 count -= c;
 761         }
 762
 763         kfree(buffer);
 764
 765         return (err) ? err : cnt;
 766 }
 767
 768 static ssize_t
 769 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 770 {
 771         unsigned long p = *ppos;
 772         struct inode *inode = file->f_path.dentry->d_inode;
 773         int fbidx = iminor(inode);
 774         struct fb_info *info = registered_fb[fbidx];
 775         u32 *buffer, *src;
 776         u32 __iomem *dst;
 777         int c, i, cnt = 0, err = 0;
 778         unsigned long total_size;
 779
 780         if (!info || !info->screen_base)
 781                 return -ENODEV;
 782
 783         if (info->state != FBINFO_STATE_RUNNING)
 784                 return -EPERM;
 785
 786         if (info->fbops->fb_write)
 787                 return info->fbops->fb_write(info, buf, count, ppos);
 788
 789         total_size = info->screen_size;
 790
 791         if (total_size == 0)
 792                 total_size = info->fix.smem_len;
 793
 794         if (p > total_size)
 795                 return -EFBIG;
 796
 797         if (count > total_size) {
 798                 err = -EFBIG;
 799                 count = total_size;
 800         }
 801
 802         if (count + p > total_size) {
 803                 if (!err)
 804                         err = -ENOSPC;
 805
 806                 count = total_size - p;
 807         }
 808
 809         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 810                          GFP_KERNEL);
 811         if (!buffer)
 812                 return -ENOMEM;
 813
 814         dst = (u32 __iomem *) (info->screen_base + p);
 815
 816         if (info->fbops->fb_sync)
 817                 info->fbops->fb_sync(info);
 818
 819         while (count) {
 820                 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 821                 src = buffer;
 822
 823                 if (copy_from_user(src, buf, c)) {
 824                         err = -EFAULT;
 825                         break;
 826                 }
 827
 828                 for (i = c >> 2; i--; )
 829                         fb_writel(*src++, dst++);
 830
 831                 if (c & 3) {
 832                         u8 *src8 = (u8 *) src;
 833                         u8 __iomem *dst8 = (u8 __iomem *) dst;
 834
 835                         for (i = c & 3; i--; )
 836                                 fb_writeb(*src8++, dst8++);
 837
 838                         dst = (u32 __iomem *) dst8;
 839                 }
 840
 841                 *ppos += c;
 842                 buf += c;
 843                 cnt += c;
 844                 count -= c;
 845         }
 846
 847         kfree(buffer);
 848
 849         return (cnt) ? cnt : err;
 850 }
 851
 852 int
 853 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
 854 {
 855         struct fb_fix_screeninfo *fix = &info->fix;
 856         unsigned int yres = info->var.yres;
 857         int err = 0;
 858
 859         if (var->yoffset > 0) {
 860                 if (var->vmode & FB_VMODE_YWRAP) {
 861                         if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
 862                                 err = -EINVAL;
 863                         else
 864                                 yres = 0;
 865                 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
 866                         err = -EINVAL;
 867         }
 868
 869         if (var->xoffset > 0 && (!fix->xpanstep ||
 870                                  (var->xoffset % fix->xpanstep)))
 871                 err = -EINVAL;
 872
 873         if (err || !info->fbops->fb_pan_display ||
 874             var->yoffset > info->var.yres_virtual - yres ||
 875             var->xoffset > info->var.xres_virtual - info->var.xres)
 876                 return -EINVAL;
 877
 878         if ((err = info->fbops->fb_pan_display(var, info)))
 879                 return err;
 880         info->var.xoffset = var->xoffset;
 881         info->var.yoffset = var->yoffset;
 882         if (var->vmode & FB_VMODE_YWRAP)
 883                 info->var.vmode |= FB_VMODE_YWRAP;
 884         else
 885                 info->var.vmode &= ~FB_VMODE_YWRAP;
 886         return 0;
 887 }
 888
 889 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var,
 890                          u32 activate)
 891 {
 892         struct fb_event event;
 893         struct fb_blit_caps caps, fbcaps;
 894         int err = 0;
 895
 896         memset(&caps, 0, sizeof(caps));
 897         memset(&fbcaps, 0, sizeof(fbcaps));
 898         caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0;
 899         event.info = info;
 900         event.data = &caps;
 901         fb_notifier_call_chain(FB_EVENT_GET_REQ, &event);
 902         info->fbops->fb_get_caps(info, &fbcaps, var);
 903
 904         if (((fbcaps.x ^ caps.x) & caps.x) ||
 905             ((fbcaps.y ^ caps.y) & caps.y) ||
 906             (fbcaps.len < caps.len))
 907                 err = -EINVAL;
 908
 909         return err;
 910 }
 911
 912 int
 913 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
 914 {
 915         int flags = info->flags;
 916         int ret = 0;
 917
 918         if (var->activate & FB_ACTIVATE_INV_MODE) {
 919                 struct fb_videomode mode1, mode2;
 920
 921                 fb_var_to_videomode(&mode1, var);
 922                 fb_var_to_videomode(&mode2, &info->var);
 923                 /* make sure we don't delete the videomode of current var */
 924                 ret = fb_mode_is_equal(&mode1, &mode2);
 925
 926                 if (!ret) {
 927                     struct fb_event event;
 928
 929                     event.info = info;
 930                     event.data = &mode1;
 931                     ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event);
 932                 }
 933
 934                 if (!ret)
 935                     fb_delete_videomode(&mode1, &info->modelist);
 936
 937
 938                 ret = (ret) ? -EINVAL : 0;
 939                 goto done;
 940         }
 941
 942         if ((var->activate & FB_ACTIVATE_FORCE) ||
 943             memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
 944                 u32 activate = var->activate;
 945
 946                 if (!info->fbops->fb_check_var) {
 947                         *var = info->var;
 948                         goto done;
 949                 }
 950
 951                 ret = info->fbops->fb_check_var(var, info);
 952
 953                 if (ret)
 954                         goto done;
 955
 956                 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
 957                         struct fb_var_screeninfo old_var;
 958                         struct fb_videomode mode;
 959
 960                         if (info->fbops->fb_get_caps) {
 961                                 ret = fb_check_caps(info, var, activate);
 962
 963                                 if (ret)
 964                                         goto done;
 965                         }
 966
 967                         old_var = info->var;
 968                         info->var = *var;
 969
 970                         if (info->fbops->fb_set_par) {
 971                                 ret = info->fbops->fb_set_par(info);
 972
 973                                 if (ret) {
 974                                         info->var = old_var;
 975                                         printk(KERN_WARNING "detected "
 976                                                 "fb_set_par error, "
 977                                                 "error code: %d\n", ret);
 978                                         goto done;
 979                                 }
 980                         }
 981
 982                         fb_pan_display(info, &info->var);
 983                         fb_set_cmap(&info->cmap, info);
 984                         fb_var_to_videomode(&mode, &info->var);
 985
 986                         if (info->modelist.prev && info->modelist.next &&
 987                             !list_empty(&info->modelist))
 988                                 ret = fb_add_videomode(&mode, &info->modelist);
 989
 990                         if (!ret && (flags & FBINFO_MISC_USEREVENT)) {
 991                                 struct fb_event event;
 992                                 int evnt = (activate & FB_ACTIVATE_ALL) ?
 993                                         FB_EVENT_MODE_CHANGE_ALL :
 994                                         FB_EVENT_MODE_CHANGE;
 995
 996                                 info->flags &= ~FBINFO_MISC_USEREVENT;
 997                                 event.info = info;
 998                                 event.data = &mode;
 999                                 fb_notifier_call_chain(evnt, &event);
1000                         }
1001                 }
1002         }
1003
1004  done:
1005         return ret;
1006 }
1007
1008 int
1009 fb_blank(struct fb_info *info, int blank)
1010 {
1011         struct fb_event event;
1012         int ret = -EINVAL, early_ret;
1013
1014         if (blank > FB_BLANK_POWERDOWN)
1015                 blank = FB_BLANK_POWERDOWN;
1016
1017         event.info = info;
1018         event.data = &blank;
1019
1020         early_ret = fb_notifier_call_chain(FB_EARLY_EVENT_BLANK, &event);
1021
1022         if (info->fbops->fb_blank)
1023                 ret = info->fbops->fb_blank(blank, info);
1024
1025         if (!ret)
1026                 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
1027         else {
1028                 /*
1029                  * if fb_blank is failed then revert effects of
1030                  * the early blank event.
1031                  */
1032                 if (!early_ret)
1033                         fb_notifier_call_chain(FB_R_EARLY_EVENT_BLANK, &event);
1034         }
1035
1036         return ret;
1037 }
1038
1039 static long do_fb_ioctl(struct fb_info *info, unsigned int cmd,
1040                         unsigned long arg)
1041 {
1042         struct fb_ops *fb;
1043         struct fb_var_screeninfo var;
1044         struct fb_fix_screeninfo fix;
1045         struct fb_con2fbmap con2fb;
1046         struct fb_cmap cmap_from;
1047         struct fb_cmap_user cmap;
1048         struct fb_event event;
1049         void __user *argp = (void __user *)arg;
1050         long ret = 0;
1051
1052         switch (cmd) {
1053         case FBIOGET_VSCREENINFO:
1054                 if (!lock_fb_info(info))
1055                         return -ENODEV;
1056                 var = info->var;
1057                 unlock_fb_info(info);
1058
1059                 ret = copy_to_user(argp, &var, sizeof(var)) ? -EFAULT : 0;
1060                 break;
1061         case FBIOPUT_VSCREENINFO:
1062                 if (copy_from_user(&var, argp, sizeof(var)))
1063                         return -EFAULT;
1064                 if (!lock_fb_info(info))
1065                         return -ENODEV;
1066                 acquire_console_sem();
1067                 info->flags |= FBINFO_MISC_USEREVENT;
1068                 ret = fb_set_var(info, &var);
1069                 info->flags &= ~FBINFO_MISC_USEREVENT;
1070                 release_console_sem();
1071                 unlock_fb_info(info);
1072                 if (!ret && copy_to_user(argp, &var, sizeof(var)))
1073                         ret = -EFAULT;
1074                 break;
1075         case FBIOGET_FSCREENINFO:
1076                 if (!lock_fb_info(info))
1077                         return -ENODEV;
1078                 fix = info->fix;
1079                 unlock_fb_info(info);
1080
1081                 ret = copy_to_user(argp, &fix, sizeof(fix)) ? -EFAULT : 0;
1082                 break;
1083         case FBIOPUTCMAP:
1084                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1085                         return -EFAULT;
1086                 ret = fb_set_user_cmap(&cmap, info);
1087                 break;
1088         case FBIOGETCMAP:
1089                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1090                         return -EFAULT;
1091                 if (!lock_fb_info(info))
1092                         return -ENODEV;
1093                 cmap_from = info->cmap;
1094                 unlock_fb_info(info);
1095                 ret = fb_cmap_to_user(&cmap_from, &cmap);
1096                 break;
1097         case FBIOPAN_DISPLAY:
1098                 if (copy_from_user(&var, argp, sizeof(var)))
1099                         return -EFAULT;
1100                 if (!lock_fb_info(info))
1101                         return -ENODEV;
1102                 acquire_console_sem();
1103                 ret = fb_pan_display(info, &var);
1104                 release_console_sem();
1105                 unlock_fb_info(info);
1106                 if (ret == 0 && copy_to_user(argp, &var, sizeof(var)))
1107                         return -EFAULT;
1108                 break;
1109         case FBIO_CURSOR:
1110                 ret = -EINVAL;
1111                 break;
1112         case FBIOGET_CON2FBMAP:
1113                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1114                         return -EFAULT;
1115                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1116                         return -EINVAL;
1117                 con2fb.framebuffer = -1;
1118                 event.data = &con2fb;
1119                 if (!lock_fb_info(info))
1120                         return -ENODEV;
1121                 event.info = info;
1122                 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
1123                 unlock_fb_info(info);
1124                 ret = copy_to_user(argp, &con2fb, sizeof(con2fb)) ? -EFAULT : 0;
1125                 break;
1126         case FBIOPUT_CON2FBMAP:
1127                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1128                         return -EFAULT;
1129                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1130                         return -EINVAL;
1131                 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
1132                         return -EINVAL;
1133                 if (!registered_fb[con2fb.framebuffer])
1134                         request_module("fb%d", con2fb.framebuffer);
1135                 if (!registered_fb[con2fb.framebuffer]) {
1136                         ret = -EINVAL;
1137                         break;
1138                 }
1139                 event.data = &con2fb;
1140                 if (!lock_fb_info(info))
1141                         return -ENODEV;
1142                 event.info = info;
1143                 ret = fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP, &event);
1144                 unlock_fb_info(info);
1145                 break;
1146         case FBIOBLANK:
1147                 if (!lock_fb_info(info))
1148                         return -ENODEV;
1149                 acquire_console_sem();
1150                 info->flags |= FBINFO_MISC_USEREVENT;
1151                 ret = fb_blank(info, arg);
1152                 info->flags &= ~FBINFO_MISC_USEREVENT;
1153                 release_console_sem();
1154                 unlock_fb_info(info);
1155                 break;
1156         default:
1157                 if (!lock_fb_info(info))
1158                         return -ENODEV;
1159                 fb = info->fbops;
1160                 if (fb->fb_ioctl)
1161                         ret = fb->fb_ioctl(info, cmd, arg);
1162                 else
1163                         ret = -ENOTTY;
1164                 unlock_fb_info(info);
1165         }
1166         return ret;
1167 }
1168
1169 static long fb_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1170 {
1171         struct inode *inode = file->f_path.dentry->d_inode;
1172         int fbidx = iminor(inode);
1173         struct fb_info *info = registered_fb[fbidx];
1174
1175         return do_fb_ioctl(info, cmd, arg);
1176 }
1177
1178 #ifdef CONFIG_COMPAT
1179 struct fb_fix_screeninfo32 {
1180         char                    id[16];
1181         compat_caddr_t          smem_start;
1182         u32                     smem_len;
1183         u32                     type;
1184         u32                     type_aux;
1185         u32                     visual;
1186         u16                     xpanstep;
1187         u16                     ypanstep;
1188         u16                     ywrapstep;
1189         u32                     line_length;
1190         compat_caddr_t          mmio_start;
1191         u32                     mmio_len;
1192         u32                     accel;
1193         u16                     reserved[3];
1194 };
1195
1196 struct fb_cmap32 {
1197         u32                     start;
1198         u32                     len;
1199         compat_caddr_t  red;
1200         compat_caddr_t  green;
1201         compat_caddr_t  blue;
1202         compat_caddr_t  transp;
1203 };
1204
1205 static int fb_getput_cmap(struct fb_info *info, unsigned int cmd,
1206                           unsigned long arg)
1207 {
1208         struct fb_cmap_user __user *cmap;
1209         struct fb_cmap32 __user *cmap32;
1210         __u32 data;
1211         int err;
1212
1213         cmap = compat_alloc_user_space(sizeof(*cmap));
1214         cmap32 = compat_ptr(arg);
1215
1216         if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1217                 return -EFAULT;
1218
1219         if (get_user(data, &cmap32->red) ||
1220             put_user(compat_ptr(data), &cmap->red) ||
1221             get_user(data, &cmap32->green) ||
1222             put_user(compat_ptr(data), &cmap->green) ||
1223             get_user(data, &cmap32->blue) ||
1224             put_user(compat_ptr(data), &cmap->blue) ||
1225             get_user(data, &cmap32->transp) ||
1226             put_user(compat_ptr(data), &cmap->transp))
1227                 return -EFAULT;
1228
1229         err = do_fb_ioctl(info, cmd, (unsigned long) cmap);
1230
1231         if (!err) {
1232                 if (copy_in_user(&cmap32->start,
1233                                  &cmap->start,
1234                                  2 * sizeof(__u32)))
1235                         err = -EFAULT;
1236         }
1237         return err;
1238 }
1239
1240 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1241                                   struct fb_fix_screeninfo32 __user *fix32)
1242 {
1243         __u32 data;
1244         int err;
1245
1246         err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1247
1248         data = (__u32) (unsigned long) fix->smem_start;
1249         err |= put_user(data, &fix32->smem_start);
1250
1251         err |= put_user(fix->smem_len, &fix32->smem_len);
1252         err |= put_user(fix->type, &fix32->type);
1253         err |= put_user(fix->type_aux, &fix32->type_aux);
1254         err |= put_user(fix->visual, &fix32->visual);
1255         err |= put_user(fix->xpanstep, &fix32->xpanstep);
1256         err |= put_user(fix->ypanstep, &fix32->ypanstep);
1257         err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1258         err |= put_user(fix->line_length, &fix32->line_length);
1259
1260         data = (__u32) (unsigned long) fix->mmio_start;
1261         err |= put_user(data, &fix32->mmio_start);
1262
1263         err |= put_user(fix->mmio_len, &fix32->mmio_len);
1264         err |= put_user(fix->accel, &fix32->accel);
1265         err |= copy_to_user(fix32->reserved, fix->reserved,
1266                             sizeof(fix->reserved));
1267
1268         return err;
1269 }
1270
1271 static int fb_get_fscreeninfo(struct fb_info *info, unsigned int cmd,
1272                               unsigned long arg)
1273 {
1274         mm_segment_t old_fs;
1275         struct fb_fix_screeninfo fix;
1276         struct fb_fix_screeninfo32 __user *fix32;
1277         int err;
1278
1279         fix32 = compat_ptr(arg);
1280
1281         old_fs = get_fs();
1282         set_fs(KERNEL_DS);
1283         err = do_fb_ioctl(info, cmd, (unsigned long) &fix);
1284         set_fs(old_fs);
1285
1286         if (!err)
1287                 err = do_fscreeninfo_to_user(&fix, fix32);
1288
1289         return err;
1290 }
1291
1292 static long fb_compat_ioctl(struct file *file, unsigned int cmd,
1293                             unsigned long arg)
1294 {
1295         struct inode *inode = file->f_path.dentry->d_inode;
1296         int fbidx = iminor(inode);
1297         struct fb_info *info = registered_fb[fbidx];
1298         struct fb_ops *fb = info->fbops;
1299         long ret = -ENOIOCTLCMD;
1300
1301         switch(cmd) {
1302         case FBIOGET_VSCREENINFO:
1303         case FBIOPUT_VSCREENINFO:
1304         case FBIOPAN_DISPLAY:
1305         case FBIOGET_CON2FBMAP:
1306         case FBIOPUT_CON2FBMAP:
1307                 arg = (unsigned long) compat_ptr(arg);
1308         case FBIOBLANK:
1309                 ret = do_fb_ioctl(info, cmd, arg);
1310                 break;
1311
1312         case FBIOGET_FSCREENINFO:
1313                 ret = fb_get_fscreeninfo(info, cmd, arg);
1314                 break;
1315
1316         case FBIOGETCMAP:
1317         case FBIOPUTCMAP:
1318                 ret = fb_getput_cmap(info, cmd, arg);
1319                 break;
1320
1321         default:
1322                 if (fb->fb_compat_ioctl)
1323                         ret = fb->fb_compat_ioctl(info, cmd, arg);
1324                 break;
1325         }
1326         return ret;
1327 }
1328 #endif
1329
1330 static int
1331 fb_mmap(struct file *file, struct vm_area_struct * vma)
1332 {
1333         int fbidx = iminor(file->f_path.dentry->d_inode);
1334         struct fb_info *info = registered_fb[fbidx];
1335         struct fb_ops *fb = info->fbops;
1336         unsigned long off;
1337         unsigned long start;
1338         u32 len;
1339
1340         if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
1341                 return -EINVAL;
1342         off = vma->vm_pgoff << PAGE_SHIFT;
1343         if (!fb)
1344                 return -ENODEV;
1345         mutex_lock(&info->mm_lock);
1346         if (fb->fb_mmap) {
1347                 int res;
1348                 res = fb->fb_mmap(info, vma);
1349                 mutex_unlock(&info->mm_lock);
1350                 return res;
1351         }
1352
1353         /* frame buffer memory */
1354         start = info->fix.smem_start;
1355         len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
1356         if (off >= len) {
1357                 /* memory mapped io */
1358                 off -= len;
1359                 if (info->var.accel_flags) {
1360                         mutex_unlock(&info->mm_lock);
1361                         return -EINVAL;
1362                 }
1363                 start = info->fix.mmio_start;
1364                 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
1365         }
1366         mutex_unlock(&info->mm_lock);
1367         start &= PAGE_MASK;
1368         if ((vma->vm_end - vma->vm_start + off) > len)
1369                 return -EINVAL;
1370         off += start;
1371         vma->vm_pgoff = off >> PAGE_SHIFT;
1372         /* This is an IO map - tell maydump to skip this VMA */
1373         vma->vm_flags |= VM_IO | VM_RESERVED;
1374         vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
1375         fb_pgprotect(file, vma, off);
1376         if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1377                              vma->vm_end - vma->vm_start, vma->vm_page_prot))
1378                 return -EAGAIN;
1379         return 0;
1380 }
1381
1382 static int
1383 fb_open(struct inode *inode, struct file *file)
1384 __acquires(&info->lock)
1385 __releases(&info->lock)
1386 {
1387         int fbidx = iminor(inode);
1388         struct fb_info *info;
1389         int res = 0;
1390
1391         if (fbidx >= FB_MAX)
1392                 return -ENODEV;
1393         info = registered_fb[fbidx];
1394         if (!info)
1395                 request_module("fb%d", fbidx);
1396         info = registered_fb[fbidx];
1397         if (!info)
1398                 return -ENODEV;
1399         mutex_lock(&info->lock);
1400         if (!try_module_get(info->fbops->owner)) {
1401                 res = -ENODEV;
1402                 goto out;
1403         }
1404         file->private_data = info;
1405         if (info->fbops->fb_open) {
1406                 res = info->fbops->fb_open(info,1);
1407                 if (res)
1408                         module_put(info->fbops->owner);
1409         }
1410 #ifdef CONFIG_FB_DEFERRED_IO
1411         if (info->fbdefio)
1412                 fb_deferred_io_open(info, inode, file);
1413 #endif
1414 out:
1415         mutex_unlock(&info->lock);
1416         return res;
1417 }
1418
1419 static int
1420 fb_release(struct inode *inode, struct file *file)
1421 __acquires(&info->lock)
1422 __releases(&info->lock)
1423 {
1424         struct fb_info * const info = file->private_data;
1425
1426         mutex_lock(&info->lock);
1427         if (info->fbops->fb_release)
1428                 info->fbops->fb_release(info,1);
1429         module_put(info->fbops->owner);
1430         mutex_unlock(&info->lock);
1431         return 0;
1432 }
1433
1434 static const struct file_operations fb_fops = {
1435         .owner =        THIS_MODULE,
1436         .read =         fb_read,
1437         .write =        fb_write,
1438         .unlocked_ioctl = fb_ioctl,
1439 #ifdef CONFIG_COMPAT
1440         .compat_ioctl = fb_compat_ioctl,
1441 #endif
1442         .mmap =         fb_mmap,
1443         .open =         fb_open,
1444         .release =      fb_release,
1445 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1446         .get_unmapped_area = get_fb_unmapped_area,
1447 #endif
1448 #ifdef CONFIG_FB_DEFERRED_IO
1449         .fsync =        fb_deferred_io_fsync,
1450 #endif
1451 };
1452
1453 struct class *fb_class;
1454 EXPORT_SYMBOL(fb_class);
1455
1456 static int fb_check_foreignness(struct fb_info *fi)
1457 {
1458         const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN;
1459
1460         fi->flags &= ~FBINFO_FOREIGN_ENDIAN;
1461
1462 #ifdef __BIG_ENDIAN
1463         fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH;
1464 #else
1465         fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0;
1466 #endif /* __BIG_ENDIAN */
1467
1468         if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) {
1469                 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to "
1470                        "support this framebuffer\n", fi->fix.id);
1471                 return -ENOSYS;
1472         } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) {
1473                 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to "
1474                        "support this framebuffer\n", fi->fix.id);
1475                 return -ENOSYS;
1476         }
1477
1478         return 0;
1479 }
1480
1481 static bool apertures_overlap(struct aperture *gen, struct aperture *hw)
1482 {
1483         /* is the generic aperture base the same as the HW one */
1484         if (gen->base == hw->base)
1485                 return true;
1486         /* is the generic aperture base inside the hw base->hw base+size */
1487         if (gen->base > hw->base && gen->base <= hw->base + hw->size)
1488                 return true;
1489         return false;
1490 }
1491
1492 static bool fb_do_apertures_overlap(struct apertures_struct *gena,
1493                                     struct apertures_struct *hwa)
1494 {
1495         int i, j;
1496         if (!hwa || !gena)
1497                 return false;
1498
1499         for (i = 0; i < hwa->count; ++i) {
1500                 struct aperture *h = &hwa->ranges[i];
1501                 for (j = 0; j < gena->count; ++j) {
1502                         struct aperture *g = &gena->ranges[j];
1503                         printk(KERN_DEBUG "checking generic (%llx %llx) vs hw (%llx %llx)\n",
1504                                 (unsigned long long)g->base,
1505                                 (unsigned long long)g->size,
1506                                 (unsigned long long)h->base,
1507                                 (unsigned long long)h->size);
1508                         if (apertures_overlap(g, h))
1509                                 return true;
1510                 }
1511         }
1512
1513         return false;
1514 }
1515
1516 #define VGA_FB_PHYS 0xA0000
1517 void remove_conflicting_framebuffers(struct apertures_struct *a,
1518                                      const char *name, bool primary)
1519 {
1520         int i;
1521
1522         /* check all firmware fbs and kick off if the base addr overlaps */
1523         for (i = 0 ; i < FB_MAX; i++) {
1524                 struct apertures_struct *gen_aper;
1525                 if (!registered_fb[i])
1526                         continue;
1527
1528                 if (!(registered_fb[i]->flags & FBINFO_MISC_FIRMWARE))
1529                         continue;
1530
1531                 gen_aper = registered_fb[i]->apertures;
1532                 if (fb_do_apertures_overlap(gen_aper, a) ||
1533                         (primary && gen_aper && gen_aper->count &&
1534                          gen_aper->ranges[0].base == VGA_FB_PHYS)) {
1535
1536                         printk(KERN_ERR "fb: conflicting fb hw usage "
1537                                "%s vs %s - removing generic driver\n",
1538                                name, registered_fb[i]->fix.id);
1539                         unregister_framebuffer(registered_fb[i]);
1540                 }
1541         }
1542 }
1543 EXPORT_SYMBOL(remove_conflicting_framebuffers);
1544
1545 /**
1546  *      register_framebuffer - registers a frame buffer device
1547  *      @fb_info: frame buffer info structure
1548  *
1549  *      Registers a frame buffer device @fb_info.
1550  *
1551  *      Returns negative errno on error, or zero for success.
1552  *
1553  */
1554
1555 int
1556 register_framebuffer(struct fb_info *fb_info)
1557 {
1558         int i;
1559         struct fb_event event;
1560         struct fb_videomode mode;
1561
1562         if (num_registered_fb == FB_MAX)
1563                 return -ENXIO;
1564
1565         if (fb_check_foreignness(fb_info))
1566                 return -ENOSYS;
1567
1568         remove_conflicting_framebuffers(fb_info->apertures, fb_info->fix.id,
1569                                          fb_is_primary_device(fb_info));
1570
1571         num_registered_fb++;
1572         for (i = 0 ; i < FB_MAX; i++)
1573                 if (!registered_fb[i])
1574                         break;
1575         fb_info->node = i;
1576         mutex_init(&fb_info->lock);
1577         mutex_init(&fb_info->mm_lock);
1578
1579         fb_info->dev = device_create(fb_class, fb_info->device,
1580                                      MKDEV(FB_MAJOR, i), NULL, "fb%d", i);
1581         if (IS_ERR(fb_info->dev)) {
1582                 /* Not fatal */
1583                 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1584                 fb_info->dev = NULL;
1585         } else
1586                 fb_init_device(fb_info);
1587
1588         if (fb_info->pixmap.addr == NULL) {
1589                 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1590                 if (fb_info->pixmap.addr) {
1591                         fb_info->pixmap.size = FBPIXMAPSIZE;
1592                         fb_info->pixmap.buf_align = 1;
1593                         fb_info->pixmap.scan_align = 1;
1594                         fb_info->pixmap.access_align = 32;
1595                         fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1596                 }
1597         }
1598         fb_info->pixmap.offset = 0;
1599
1600         if (!fb_info->pixmap.blit_x)
1601                 fb_info->pixmap.blit_x = ~(u32)0;
1602
1603         if (!fb_info->pixmap.blit_y)
1604                 fb_info->pixmap.blit_y = ~(u32)0;
1605
1606         if (!fb_info->modelist.prev || !fb_info->modelist.next)
1607                 INIT_LIST_HEAD(&fb_info->modelist);
1608
1609         fb_var_to_videomode(&mode, &fb_info->var);
1610         fb_add_videomode(&mode, &fb_info->modelist);
1611         registered_fb[i] = fb_info;
1612
1613         event.info = fb_info;
1614         if (!lock_fb_info(fb_info))
1615                 return -ENODEV;
1616         fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1617         unlock_fb_info(fb_info);
1618         return 0;
1619 }
1620
1621
1622 /**
1623  *      unregister_framebuffer - releases a frame buffer device
1624  *      @fb_info: frame buffer info structure
1625  *
1626  *      Unregisters a frame buffer device @fb_info.
1627  *
1628  *      Returns negative errno on error, or zero for success.
1629  *
1630  *      This function will also notify the framebuffer console
1631  *      to release the driver.
1632  *
1633  *      This is meant to be called within a driver's module_exit()
1634  *      function. If this is called outside module_exit(), ensure
1635  *      that the driver implements fb_open() and fb_release() to
1636  *      check that no processes are using the device.
1637  */
1638
1639 int
1640 unregister_framebuffer(struct fb_info *fb_info)
1641 {
1642         struct fb_event event;
1643         int i, ret = 0;
1644
1645         i = fb_info->node;
1646         if (!registered_fb[i]) {
1647                 ret = -EINVAL;
1648                 goto done;
1649         }
1650
1651
1652         if (!lock_fb_info(fb_info))
1653                 return -ENODEV;
1654         event.info = fb_info;
1655         ret = fb_notifier_call_chain(FB_EVENT_FB_UNBIND, &event);
1656         unlock_fb_info(fb_info);
1657
1658         if (ret) {
1659                 ret = -EINVAL;
1660                 goto done;
1661         }
1662
1663         if (fb_info->pixmap.addr &&
1664             (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1665                 kfree(fb_info->pixmap.addr);
1666         fb_destroy_modelist(&fb_info->modelist);
1667         registered_fb[i]=NULL;
1668         num_registered_fb--;
1669         fb_cleanup_device(fb_info);
1670         device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1671         event.info = fb_info;
1672         fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1673
1674         /* this may free fb info */
1675         if (fb_info->fbops->fb_destroy)
1676                 fb_info->fbops->fb_destroy(fb_info);
1677 done:
1678         return ret;
1679 }
1680
1681 /**
1682  *      fb_set_suspend - low level driver signals suspend
1683  *      @info: framebuffer affected
1684  *      @state: 0 = resuming, !=0 = suspending
1685  *
1686  *      This is meant to be used by low level drivers to
1687  *      signal suspend/resume to the core & clients.
1688  *      It must be called with the console semaphore held
1689  */
1690 void fb_set_suspend(struct fb_info *info, int state)
1691 {
1692         struct fb_event event;
1693
1694         if (!lock_fb_info(info))
1695                 return;
1696         event.info = info;
1697         if (state) {
1698                 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event);
1699                 info->state = FBINFO_STATE_SUSPENDED;
1700         } else {
1701                 info->state = FBINFO_STATE_RUNNING;
1702                 fb_notifier_call_chain(FB_EVENT_RESUME, &event);
1703         }
1704         unlock_fb_info(info);
1705 }
1706
1707 /**
1708  *      fbmem_init - init frame buffer subsystem
1709  *
1710  *      Initialize the frame buffer subsystem.
1711  *
1712  *      NOTE: This function is _only_ to be called by drivers/char/mem.c.
1713  *
1714  */
1715
1716 static int __init
1717 fbmem_init(void)
1718 {
1719         proc_create("fb", 0, NULL, &fb_proc_fops);
1720
1721         if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1722                 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1723
1724         fb_class = class_create(THIS_MODULE, "graphics");
1725         if (IS_ERR(fb_class)) {
1726                 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1727                 fb_class = NULL;
1728         }
1729         return 0;
1730 }
1731
1732 #ifdef MODULE
1733 module_init(fbmem_init);
1734 static void __exit
1735 fbmem_exit(void)
1736 {
1737         remove_proc_entry("fb", NULL);
1738         class_destroy(fb_class);
1739         unregister_chrdev(FB_MAJOR, "fb");
1740 }
1741
1742 module_exit(fbmem_exit);
1743 MODULE_LICENSE("GPL");
1744 MODULE_DESCRIPTION("Framebuffer base");
1745 #else
1746 subsys_initcall(fbmem_init);
1747 #endif
1748
1749 int fb_new_modelist(struct fb_info *info)
1750 {
1751         struct fb_event event;
1752         struct fb_var_screeninfo var = info->var;
1753         struct list_head *pos, *n;
1754         struct fb_modelist *modelist;
1755         struct fb_videomode *m, mode;
1756         int err = 1;
1757
1758         list_for_each_safe(pos, n, &info->modelist) {
1759                 modelist = list_entry(pos, struct fb_modelist, list);
1760                 m = &modelist->mode;
1761                 fb_videomode_to_var(&var, m);
1762                 var.activate = FB_ACTIVATE_TEST;
1763                 err = fb_set_var(info, &var);
1764                 fb_var_to_videomode(&mode, &var);
1765                 if (err || !fb_mode_is_equal(m, &mode)) {
1766                         list_del(pos);
1767                         kfree(pos);
1768                 }
1769         }
1770
1771         err = 1;
1772
1773         if (!list_empty(&info->modelist)) {
1774                 if (!lock_fb_info(info))
1775                         return -ENODEV;
1776                 event.info = info;
1777                 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
1778                 unlock_fb_info(info);
1779         }
1780
1781         return err;
1782 }
1783
1784 static char *video_options[FB_MAX] __read_mostly;
1785 static int ofonly __read_mostly;
1786
1787 /**
1788  * fb_get_options - get kernel boot parameters
1789  * @name:   framebuffer name as it would appear in
1790  *          the boot parameter line
1791  *          (video=<name>:<options>)
1792  * @option: the option will be stored here
1793  *
1794  * NOTE: Needed to maintain backwards compatibility
1795  */
1796 int fb_get_options(char *name, char **option)
1797 {
1798         char *opt, *options = NULL;
1799         int retval = 0;
1800         int name_len = strlen(name), i;
1801
1802         if (name_len && ofonly && strncmp(name, "offb", 4))
1803                 retval = 1;
1804
1805         if (name_len && !retval) {
1806                 for (i = 0; i < FB_MAX; i++) {
1807                         if (video_options[i] == NULL)
1808                                 continue;
1809                         if (!video_options[i][0])
1810                                 continue;
1811                         opt = video_options[i];
1812                         if (!strncmp(name, opt, name_len) &&
1813                             opt[name_len] == ':')
1814                                 options = opt + name_len + 1;
1815                 }
1816         }
1817         if (options && !strncmp(options, "off", 3))
1818                 retval = 1;
1819
1820         if (option)
1821                 *option = options;
1822
1823         return retval;
1824 }
1825
1826 #ifndef MODULE
1827 /**
1828  *      video_setup - process command line options
1829  *      @options: string of options
1830  *
1831  *      Process command line options for frame buffer subsystem.
1832  *
1833  *      NOTE: This function is a __setup and __init function.
1834  *            It only stores the options.  Drivers have to call
1835  *            fb_get_options() as necessary.
1836  *
1837  *      Returns zero.
1838  *
1839  */
1840 static int __init video_setup(char *options)
1841 {
1842         int i, global = 0;
1843
1844         if (!options || !*options)
1845                 global = 1;
1846
1847         if (!global && !strncmp(options, "ofonly", 6)) {
1848                 ofonly = 1;
1849                 global = 1;
1850         }
1851
1852         if (!global && !strchr(options, ':')) {
1853                 fb_mode_option = options;
1854                 global = 1;
1855         }
1856
1857         if (!global) {
1858                 for (i = 0; i < FB_MAX; i++) {
1859                         if (video_options[i] == NULL) {
1860                                 video_options[i] = options;
1861                                 break;
1862                         }
1863
1864                 }
1865         }
1866
1867         return 1;
1868 }
1869 __setup("video=", video_setup);
1870 #endif
1871
1872     /*
1873      *  Visible symbols for modules
1874      */
1875
1876 EXPORT_SYMBOL(register_framebuffer);
1877 EXPORT_SYMBOL(unregister_framebuffer);
1878 EXPORT_SYMBOL(num_registered_fb);
1879 EXPORT_SYMBOL(registered_fb);
1880 EXPORT_SYMBOL(fb_show_logo);
1881 EXPORT_SYMBOL(fb_set_var);
1882 EXPORT_SYMBOL(fb_blank);
1883 EXPORT_SYMBOL(fb_pan_display);
1884 EXPORT_SYMBOL(fb_get_buffer_offset);
1885 EXPORT_SYMBOL(fb_set_suspend);
1886 EXPORT_SYMBOL(fb_get_options);
1887
1888 MODULE_LICENSE("GPL");