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 void fb_show_charge_logo(struct linux_logo *logo)
 333 {
 334         fb_logo.logo = logo;
 335         return;
 336 }
 337
 338 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
 339 {
 340         u32 size = width * height, i;
 341
 342         out += size - 1;
 343
 344         for (i = size; i--; )
 345                 *out-- = *in++;
 346 }
 347
 348 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
 349 {
 350         int i, j, h = height - 1;
 351
 352         for (i = 0; i < height; i++)
 353                 for (j = 0; j < width; j++)
 354                                 out[height * j + h - i] = *in++;
 355 }
 356
 357 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
 358 {
 359         int i, j, w = width - 1;
 360
 361         for (i = 0; i < height; i++)
 362                 for (j = 0; j < width; j++)
 363                         out[height * (w - j) + i] = *in++;
 364 }
 365
 366 static void fb_rotate_logo(struct fb_info *info, u8 *dst,
 367                            struct fb_image *image, int rotate)
 368 {
 369         u32 tmp;
 370
 371         if (rotate == FB_ROTATE_UD) {
 372                 fb_rotate_logo_ud(image->data, dst, image->width,
 373                                   image->height);
 374                 image->dx = info->var.xres - image->width - image->dx;
 375                 image->dy = info->var.yres - image->height - image->dy;
 376         } else if (rotate == FB_ROTATE_CW) {
 377                 fb_rotate_logo_cw(image->data, dst, image->width,
 378                                   image->height);
 379                 tmp = image->width;
 380                 image->width = image->height;
 381                 image->height = tmp;
 382                 tmp = image->dy;
 383                 image->dy = image->dx;
 384                 image->dx = info->var.xres - image->width - tmp;
 385         } else if (rotate == FB_ROTATE_CCW) {
 386                 fb_rotate_logo_ccw(image->data, dst, image->width,
 387                                    image->height);
 388                 tmp = image->width;
 389                 image->width = image->height;
 390                 image->height = tmp;
 391                 tmp = image->dx;
 392                 image->dx = image->dy;
 393                 image->dy = info->var.yres - image->height - tmp;
 394         }
 395
 396         image->data = dst;
 397 }
 398
 399 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
 400                             int rotate, unsigned int num)
 401 {
 402         unsigned int x;
 403
 404         if (rotate == FB_ROTATE_UR) {
 405                 for (x = 0;
 406                      x < num && image->dx + image->width <= info->var.xres;
 407                      x++) {
 408                         info->fbops->fb_imageblit(info, image);
 409                         image->dx += image->width + 8;
 410                 }
 411         } else if (rotate == FB_ROTATE_UD) {
 412                 for (x = 0; x < num && image->dx >= 0; x++) {
 413                         info->fbops->fb_imageblit(info, image);
 414                         image->dx -= image->width + 8;
 415                 }
 416         } else if (rotate == FB_ROTATE_CW) {
 417                 for (x = 0;
 418                      x < num && image->dy + image->height <= info->var.yres;
 419                      x++) {
 420                         info->fbops->fb_imageblit(info, image);
 421                         image->dy += image->height + 8;
 422                 }
 423         } else if (rotate == FB_ROTATE_CCW) {
 424                 for (x = 0; x < num && image->dy >= 0; x++) {
 425                         info->fbops->fb_imageblit(info, image);
 426                         image->dy -= image->height + 8;
 427                 }
 428         }
 429 }
 430
 431 static int fb_show_logo_line(struct fb_info *info, int rotate,
 432                              const struct linux_logo *logo, int y,
 433                              unsigned int n)
 434 {
 435         u32 *palette = NULL, *saved_pseudo_palette = NULL;
 436         unsigned char *logo_new = NULL, *logo_rotate = NULL;
 437         struct fb_image image;
 438
 439         /* Return if the frame buffer is not mapped or suspended */
 440         if (logo == NULL || info->state != FBINFO_STATE_RUNNING ||
 441             info->flags & FBINFO_MODULE)
 442                 return 0;
 443
 444         image.depth = 8;
 445         image.data = logo->data;
 446
 447         if (fb_logo.needs_cmapreset)
 448                 fb_set_logocmap(info, logo);
 449
 450         if (fb_logo.needs_truepalette ||
 451             fb_logo.needs_directpalette) {
 452                 palette = kmalloc(256 * 4, GFP_KERNEL);
 453                 if (palette == NULL)
 454                         return 0;
 455
 456                 if (fb_logo.needs_truepalette)
 457                         fb_set_logo_truepalette(info, logo, palette);
 458                 else
 459                         fb_set_logo_directpalette(info, logo, palette);
 460
 461                 saved_pseudo_palette = info->pseudo_palette;
 462                 info->pseudo_palette = palette;
 463         }
 464
 465         if (fb_logo.depth <= 4) {
 466                 logo_new = kmalloc(logo->width * logo->height, GFP_KERNEL);
 467                 if (logo_new == NULL) {
 468                         kfree(palette);
 469                         if (saved_pseudo_palette)
 470                                 info->pseudo_palette = saved_pseudo_palette;
 471                         return 0;
 472                 }
 473                 image.data = logo_new;
 474                 fb_set_logo(info, logo, logo_new, fb_logo.depth);
 475         }
 476
 477         image.dx = 0;
 478         image.dy = y;
 479         image.width = logo->width;
 480         image.height = logo->height;
 481
 482         if (rotate) {
 483                 logo_rotate = kmalloc(logo->width *
 484                                       logo->height, GFP_KERNEL);
 485                 if (logo_rotate)
 486                         fb_rotate_logo(info, logo_rotate, &image, rotate);
 487         }
 488
 489         fb_do_show_logo(info, &image, rotate, n);
 490
 491         kfree(palette);
 492         if (saved_pseudo_palette != NULL)
 493                 info->pseudo_palette = saved_pseudo_palette;
 494         kfree(logo_new);
 495         kfree(logo_rotate);
 496         return logo->height;
 497 }
 498
 499
 500 #ifdef CONFIG_FB_LOGO_EXTRA
 501
 502 #define FB_LOGO_EX_NUM_MAX 10
 503 static struct logo_data_extra {
 504         const struct linux_logo *logo;
 505         unsigned int n;
 506 } fb_logo_ex[FB_LOGO_EX_NUM_MAX];
 507 static unsigned int fb_logo_ex_num;
 508
 509 void fb_append_extra_logo(const struct linux_logo *logo, unsigned int n)
 510 {
 511         if (!n || fb_logo_ex_num == FB_LOGO_EX_NUM_MAX)
 512                 return;
 513
 514         fb_logo_ex[fb_logo_ex_num].logo = logo;
 515         fb_logo_ex[fb_logo_ex_num].n = n;
 516         fb_logo_ex_num++;
 517 }
 518
 519 static int fb_prepare_extra_logos(struct fb_info *info, unsigned int height,
 520                                   unsigned int yres)
 521 {
 522         unsigned int i;
 523
 524         /* FIXME: logo_ex supports only truecolor fb. */
 525         if (info->fix.visual != FB_VISUAL_TRUECOLOR)
 526                 fb_logo_ex_num = 0;
 527
 528         for (i = 0; i < fb_logo_ex_num; i++) {
 529                 if (fb_logo_ex[i].logo->type != fb_logo.logo->type) {
 530                         fb_logo_ex[i].logo = NULL;
 531                         continue;
 532                 }
 533                 height += fb_logo_ex[i].logo->height;
 534                 if (height > yres) {
 535                         height -= fb_logo_ex[i].logo->height;
 536                         fb_logo_ex_num = i;
 537                         break;
 538                 }
 539         }
 540         return height;
 541 }
 542
 543 static int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
 544 {
 545         unsigned int i;
 546
 547         for (i = 0; i < fb_logo_ex_num; i++)
 548                 y += fb_show_logo_line(info, rotate,
 549                                        fb_logo_ex[i].logo, y, fb_logo_ex[i].n);
 550
 551         return y;
 552 }
 553
 554 #else /* !CONFIG_FB_LOGO_EXTRA */
 555
 556 static inline int fb_prepare_extra_logos(struct fb_info *info,
 557                                          unsigned int height,
 558                                          unsigned int yres)
 559 {
 560         return height;
 561 }
 562
 563 static inline int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
 564 {
 565         return y;
 566 }
 567
 568 #endif /* CONFIG_FB_LOGO_EXTRA */
 569
 570
 571 int fb_prepare_logo(struct fb_info *info, int rotate)
 572 {
 573         int depth = fb_get_color_depth(&info->var, &info->fix);
 574         unsigned int yres;
 575
 576         memset(&fb_logo, 0, sizeof(struct logo_data));
 577
 578         if (info->flags & FBINFO_MISC_TILEBLITTING ||
 579             info->flags & FBINFO_MODULE)
 580                 return 0;
 581
 582         if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
 583                 depth = info->var.blue.length;
 584                 if (info->var.red.length < depth)
 585                         depth = info->var.red.length;
 586                 if (info->var.green.length < depth)
 587                         depth = info->var.green.length;
 588         }
 589
 590         if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) {
 591                 /* assume console colormap */
 592                 depth = 4;
 593         }
 594
 595         /* Return if no suitable logo was found */
 596         fb_logo.logo = fb_find_logo(depth);
 597
 598         if (!fb_logo.logo) {
 599                 return 0;
 600         }
 601
 602         if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
 603                 yres = info->var.yres;
 604         else
 605                 yres = info->var.xres;
 606
 607         if (fb_logo.logo->height > yres) {
 608                 fb_logo.logo = NULL;
 609                 return 0;
 610         }
 611
 612         /* What depth we asked for might be different from what we get */
 613         if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
 614                 fb_logo.depth = 8;
 615         else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
 616                 fb_logo.depth = 4;
 617         else
 618                 fb_logo.depth = 1;
 619
 620
 621         if (fb_logo.depth > 4 && depth > 4) {
 622                 switch (info->fix.visual) {
 623                 case FB_VISUAL_TRUECOLOR:
 624                         fb_logo.needs_truepalette = 1;
 625                         break;
 626                 case FB_VISUAL_DIRECTCOLOR:
 627                         fb_logo.needs_directpalette = 1;
 628                         fb_logo.needs_cmapreset = 1;
 629                         break;
 630                 case FB_VISUAL_PSEUDOCOLOR:
 631                         fb_logo.needs_cmapreset = 1;
 632                         break;
 633                 }
 634         }
 635
 636         return fb_prepare_extra_logos(info, fb_logo.logo->height, yres);
 637 }
 638
 639 int fb_show_logo(struct fb_info *info, int rotate)
 640 {
 641         int y;
 642
 643         y = fb_show_logo_line(info, rotate, fb_logo.logo, 0,
 644                               num_online_cpus());
 645         y = fb_show_extra_logos(info, y, rotate);
 646
 647         return y;
 648 }
 649 #else
 650 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
 651 int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
 652 #endif /* CONFIG_LOGO */
 653
 654 static void *fb_seq_start(struct seq_file *m, loff_t *pos)
 655 {
 656         return (*pos < FB_MAX) ? pos : NULL;
 657 }
 658
 659 static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos)
 660 {
 661         (*pos)++;
 662         return (*pos < FB_MAX) ? pos : NULL;
 663 }
 664
 665 static void fb_seq_stop(struct seq_file *m, void *v)
 666 {
 667 }
 668
 669 static int fb_seq_show(struct seq_file *m, void *v)
 670 {
 671         int i = *(loff_t *)v;
 672         struct fb_info *fi = registered_fb[i];
 673
 674         if (fi)
 675                 seq_printf(m, "%d %s\n", fi->node, fi->fix.id);
 676         return 0;
 677 }
 678
 679 static const struct seq_operations proc_fb_seq_ops = {
 680         .start  = fb_seq_start,
 681         .next   = fb_seq_next,
 682         .stop   = fb_seq_stop,
 683         .show   = fb_seq_show,
 684 };
 685
 686 static int proc_fb_open(struct inode *inode, struct file *file)
 687 {
 688         return seq_open(file, &proc_fb_seq_ops);
 689 }
 690
 691 static const struct file_operations fb_proc_fops = {
 692         .owner          = THIS_MODULE,
 693         .open           = proc_fb_open,
 694         .read           = seq_read,
 695         .llseek         = seq_lseek,
 696         .release        = seq_release,
 697 };
 698
 699 static ssize_t
 700 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 701 {
 702         unsigned long p = *ppos;
 703         struct inode *inode = file->f_path.dentry->d_inode;
 704         int fbidx = iminor(inode);
 705         struct fb_info *info = registered_fb[fbidx];
 706         u32 *buffer, *dst;
 707         u32 __iomem *src;
 708         int c, i, cnt = 0, err = 0;
 709         unsigned long total_size;
 710
 711         if (!info || ! info->screen_base)
 712                 return -ENODEV;
 713
 714         if (info->state != FBINFO_STATE_RUNNING)
 715                 return -EPERM;
 716
 717         if (info->fbops->fb_read)
 718                 return info->fbops->fb_read(info, buf, count, ppos);
 719
 720         total_size = info->screen_size;
 721
 722         if (total_size == 0)
 723                 total_size = info->fix.smem_len;
 724
 725         if (p >= total_size)
 726                 return 0;
 727
 728         if (count >= total_size)
 729                 count = total_size;
 730
 731         if (count + p > total_size)
 732                 count = total_size - p;
 733
 734         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 735                          GFP_KERNEL);
 736         if (!buffer)
 737                 return -ENOMEM;
 738
 739         src = (u32 __iomem *) (info->screen_base + p);
 740
 741         if (info->fbops->fb_sync)
 742                 info->fbops->fb_sync(info);
 743
 744         while (count) {
 745                 c  = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 746                 dst = buffer;
 747                 for (i = c >> 2; i--; )
 748                         *dst++ = fb_readl(src++);
 749                 if (c & 3) {
 750                         u8 *dst8 = (u8 *) dst;
 751                         u8 __iomem *src8 = (u8 __iomem *) src;
 752
 753                         for (i = c & 3; i--;)
 754                                 *dst8++ = fb_readb(src8++);
 755
 756                         src = (u32 __iomem *) src8;
 757                 }
 758
 759                 if (copy_to_user(buf, buffer, c)) {
 760                         err = -EFAULT;
 761                         break;
 762                 }
 763                 *ppos += c;
 764                 buf += c;
 765                 cnt += c;
 766                 count -= c;
 767         }
 768
 769         kfree(buffer);
 770
 771         return (err) ? err : cnt;
 772 }
 773
 774 static ssize_t
 775 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 776 {
 777         unsigned long p = *ppos;
 778         struct inode *inode = file->f_path.dentry->d_inode;
 779         int fbidx = iminor(inode);
 780         struct fb_info *info = registered_fb[fbidx];
 781         u32 *buffer, *src;
 782         u32 __iomem *dst;
 783         int c, i, cnt = 0, err = 0;
 784         unsigned long total_size;
 785
 786         if (!info || !info->screen_base)
 787                 return -ENODEV;
 788
 789         if (info->state != FBINFO_STATE_RUNNING)
 790                 return -EPERM;
 791
 792         if (info->fbops->fb_write)
 793                 return info->fbops->fb_write(info, buf, count, ppos);
 794
 795         total_size = info->screen_size;
 796
 797         if (total_size == 0)
 798                 total_size = info->fix.smem_len;
 799
 800         if (p > total_size)
 801                 return -EFBIG;
 802
 803         if (count > total_size) {
 804                 err = -EFBIG;
 805                 count = total_size;
 806         }
 807
 808         if (count + p > total_size) {
 809                 if (!err)
 810                         err = -ENOSPC;
 811
 812                 count = total_size - p;
 813         }
 814
 815         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 816                          GFP_KERNEL);
 817         if (!buffer)
 818                 return -ENOMEM;
 819
 820         dst = (u32 __iomem *) (info->screen_base + p);
 821
 822         if (info->fbops->fb_sync)
 823                 info->fbops->fb_sync(info);
 824
 825         while (count) {
 826                 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 827                 src = buffer;
 828
 829                 if (copy_from_user(src, buf, c)) {
 830                         err = -EFAULT;
 831                         break;
 832                 }
 833
 834                 for (i = c >> 2; i--; )
 835                         fb_writel(*src++, dst++);
 836
 837                 if (c & 3) {
 838                         u8 *src8 = (u8 *) src;
 839                         u8 __iomem *dst8 = (u8 __iomem *) dst;
 840
 841                         for (i = c & 3; i--; )
 842                                 fb_writeb(*src8++, dst8++);
 843
 844                         dst = (u32 __iomem *) dst8;
 845                 }
 846
 847                 *ppos += c;
 848                 buf += c;
 849                 cnt += c;
 850                 count -= c;
 851         }
 852
 853         kfree(buffer);
 854
 855         return (cnt) ? cnt : err;
 856 }
 857
 858 int
 859 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
 860 {
 861         struct fb_fix_screeninfo *fix = &info->fix;
 862         unsigned int yres = info->var.yres;
 863         int err = 0;
 864
 865         if (var->yoffset > 0) {
 866                 if (var->vmode & FB_VMODE_YWRAP) {
 867                         if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
 868                                 err = -EINVAL;
 869                         else
 870                                 yres = 0;
 871                 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
 872                         err = -EINVAL;
 873         }
 874
 875         if (var->xoffset > 0 && (!fix->xpanstep ||
 876                                  (var->xoffset % fix->xpanstep)))
 877                 err = -EINVAL;
 878
 879         if (err || !info->fbops->fb_pan_display ||
 880             var->yoffset > info->var.yres_virtual - yres ||
 881             var->xoffset > info->var.xres_virtual - info->var.xres)
 882                 return -EINVAL;
 883
 884         if ((err = info->fbops->fb_pan_display(var, info)))
 885                 return err;
 886         info->var.xoffset = var->xoffset;
 887         info->var.yoffset = var->yoffset;
 888         if (var->vmode & FB_VMODE_YWRAP)
 889                 info->var.vmode |= FB_VMODE_YWRAP;
 890         else
 891                 info->var.vmode &= ~FB_VMODE_YWRAP;
 892         return 0;
 893 }
 894
 895 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var,
 896                          u32 activate)
 897 {
 898         struct fb_event event;
 899         struct fb_blit_caps caps, fbcaps;
 900         int err = 0;
 901
 902         memset(&caps, 0, sizeof(caps));
 903         memset(&fbcaps, 0, sizeof(fbcaps));
 904         caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0;
 905         event.info = info;
 906         event.data = &caps;
 907         fb_notifier_call_chain(FB_EVENT_GET_REQ, &event);
 908         info->fbops->fb_get_caps(info, &fbcaps, var);
 909
 910         if (((fbcaps.x ^ caps.x) & caps.x) ||
 911             ((fbcaps.y ^ caps.y) & caps.y) ||
 912             (fbcaps.len < caps.len))
 913                 err = -EINVAL;
 914
 915         return err;
 916 }
 917
 918 int
 919 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
 920 {
 921         int flags = info->flags;
 922         int ret = 0;
 923
 924         if (var->activate & FB_ACTIVATE_INV_MODE) {
 925                 struct fb_videomode mode1, mode2;
 926
 927                 fb_var_to_videomode(&mode1, var);
 928                 fb_var_to_videomode(&mode2, &info->var);
 929                 /* make sure we don't delete the videomode of current var */
 930                 ret = fb_mode_is_equal(&mode1, &mode2);
 931
 932                 if (!ret) {
 933                     struct fb_event event;
 934
 935                     event.info = info;
 936                     event.data = &mode1;
 937                     ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event);
 938                 }
 939
 940                 if (!ret)
 941                     fb_delete_videomode(&mode1, &info->modelist);
 942
 943
 944                 ret = (ret) ? -EINVAL : 0;
 945                 goto done;
 946         }
 947
 948         if ((var->activate & FB_ACTIVATE_FORCE) ||
 949             memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
 950                 u32 activate = var->activate;
 951
 952                 if (!info->fbops->fb_check_var) {
 953                         *var = info->var;
 954                         goto done;
 955                 }
 956
 957                 ret = info->fbops->fb_check_var(var, info);
 958
 959                 if (ret)
 960                         goto done;
 961
 962                 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
 963                         struct fb_var_screeninfo old_var;
 964                         struct fb_videomode mode;
 965
 966                         if (info->fbops->fb_get_caps) {
 967                                 ret = fb_check_caps(info, var, activate);
 968
 969                                 if (ret)
 970                                         goto done;
 971                         }
 972
 973                         old_var = info->var;
 974                         info->var = *var;
 975
 976                         if (info->fbops->fb_set_par) {
 977                                 ret = info->fbops->fb_set_par(info);
 978
 979                                 if (ret) {
 980                                         info->var = old_var;
 981                                         printk(KERN_WARNING "detected "
 982                                                 "fb_set_par error, "
 983                                                 "error code: %d\n", ret);
 984                                         goto done;
 985                                 }
 986                         }
 987
 988                         fb_pan_display(info, &info->var);
 989                         fb_set_cmap(&info->cmap, info);
 990                         fb_var_to_videomode(&mode, &info->var);
 991
 992                         if (info->modelist.prev && info->modelist.next &&
 993                             !list_empty(&info->modelist))
 994                                 ret = fb_add_videomode(&mode, &info->modelist);
 995
 996                         if (!ret && (flags & FBINFO_MISC_USEREVENT)) {
 997                                 struct fb_event event;
 998                                 int evnt = (activate & FB_ACTIVATE_ALL) ?
 999                                         FB_EVENT_MODE_CHANGE_ALL :
1000                                         FB_EVENT_MODE_CHANGE;
1001
1002                                 info->flags &= ~FBINFO_MISC_USEREVENT;
1003                                 event.info = info;
1004                                 event.data = &mode;
1005                                 fb_notifier_call_chain(evnt, &event);
1006                         }
1007                 }
1008         }
1009
1010  done:
1011         return ret;
1012 }
1013
1014 int
1015 fb_blank(struct fb_info *info, int blank)
1016 {
1017         int ret = -EINVAL;
1018
1019         if (blank > FB_BLANK_POWERDOWN)
1020                 blank = FB_BLANK_POWERDOWN;
1021
1022         if (info->fbops->fb_blank)
1023                 ret = info->fbops->fb_blank(blank, info);
1024
1025         if (!ret) {
1026                 struct fb_event event;
1027
1028                 event.info = info;
1029                 event.data = &blank;
1030                 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
1031         }
1032
1033         return ret;
1034 }
1035 int fb_vaddr = 0;
1036
1037 static long do_fb_ioctl(struct fb_info *info, unsigned int cmd,
1038                         unsigned long arg)
1039 {
1040         struct fb_ops *fb;
1041         struct fb_var_screeninfo var;
1042         struct fb_fix_screeninfo fix;
1043         struct fb_con2fbmap con2fb;
1044         struct fb_cmap cmap_from;
1045         struct fb_cmap_user cmap;
1046         struct fb_event event;
1047         void __user *argp = (void __user *)arg;
1048         long ret = 0;
1049
1050         switch (cmd) {
1051         case FBIOGET_VSCREENINFO:
1052                 if (!lock_fb_info(info))
1053                         return -ENODEV;
1054                 var = info->var;
1055                 unlock_fb_info(info);
1056
1057                 ret = copy_to_user(argp, &var, sizeof(var)) ? -EFAULT : 0;
1058                 break;
1059         case FBIOPUT_VSCREENINFO:
1060                 if (copy_from_user(&var, argp, sizeof(var)))
1061                         return -EFAULT;
1062                 if (!lock_fb_info(info))
1063                         return -ENODEV;
1064                 acquire_console_sem();
1065                 info->flags |= FBINFO_MISC_USEREVENT;
1066                 ret = fb_set_var(info, &var);
1067                 info->flags &= ~FBINFO_MISC_USEREVENT;
1068                 release_console_sem();
1069                 unlock_fb_info(info);
1070                 if (!ret && copy_to_user(argp, &var, sizeof(var)))
1071                         ret = -EFAULT;
1072                 break;
1073         case FBIOGET_FSCREENINFO:
1074                 if (!lock_fb_info(info))
1075                         return -ENODEV;
1076                 fix = info->fix;
1077                 unlock_fb_info(info);
1078
1079                 ret = copy_to_user(argp, &fix, sizeof(fix)) ? -EFAULT : 0;
1080                 break;
1081         case FBIOPUTCMAP:
1082                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1083                         return -EFAULT;
1084                 ret = fb_set_user_cmap(&cmap, info);
1085                 break;
1086         case FBIOGETCMAP:
1087                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1088                         return -EFAULT;
1089                 if (!lock_fb_info(info))
1090                         return -ENODEV;
1091                 cmap_from = info->cmap;
1092                 unlock_fb_info(info);
1093                 ret = fb_cmap_to_user(&cmap_from, &cmap);
1094                 break;
1095         case FBIOPAN_DISPLAY:
1096                 if (copy_from_user(&var, argp, sizeof(var)))
1097                         return -EFAULT;
1098                 if (!lock_fb_info(info))
1099                         return -ENODEV;
1100                 acquire_console_sem();
1101                 ret = fb_pan_display(info, &var);
1102                 release_console_sem();
1103                 unlock_fb_info(info);
1104                 if (ret == 0 && copy_to_user(argp, &var, sizeof(var)))
1105                         return -EFAULT;
1106                 break;
1107         case FBIO_CURSOR:
1108                 ret = -EINVAL;
1109                 break;
1110         case FBIOGET_CON2FBMAP:
1111                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1112                         return -EFAULT;
1113                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1114                         return -EINVAL;
1115                 con2fb.framebuffer = -1;
1116                 event.data = &con2fb;
1117                 if (!lock_fb_info(info))
1118                         return -ENODEV;
1119                 event.info = info;
1120                 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
1121                 unlock_fb_info(info);
1122                 ret = copy_to_user(argp, &con2fb, sizeof(con2fb)) ? -EFAULT : 0;
1123                 break;
1124         case FBIOPUT_CON2FBMAP:
1125                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1126                         return -EFAULT;
1127                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1128                         return -EINVAL;
1129                 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
1130                         return -EINVAL;
1131                 if (!registered_fb[con2fb.framebuffer])
1132                         request_module("fb%d", con2fb.framebuffer);
1133                 if (!registered_fb[con2fb.framebuffer]) {
1134                         ret = -EINVAL;
1135                         break;
1136                 }
1137                 event.data = &con2fb;
1138                 if (!lock_fb_info(info))
1139                         return -ENODEV;
1140                 event.info = info;
1141                 ret = fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP, &event);
1142                 unlock_fb_info(info);
1143                 break;
1144         case FBIOBLANK:
1145                 if (!lock_fb_info(info))
1146                         return -ENODEV;
1147                 acquire_console_sem();
1148                 info->flags |= FBINFO_MISC_USEREVENT;
1149                 ret = fb_blank(info, arg);
1150                 info->flags &= ~FBINFO_MISC_USEREVENT;
1151                 release_console_sem();
1152                 unlock_fb_info(info);
1153                 break;
1154         default:
1155                 if (!lock_fb_info(info))
1156                         return -ENODEV;
1157                 fb = info->fbops;
1158                 if (fb->fb_ioctl)
1159                         ret = fb->fb_ioctl(info, cmd, arg);
1160                 else
1161                         ret = -ENOTTY;
1162                 unlock_fb_info(info);
1163         }
1164         return ret;
1165 }
1166
1167 static long fb_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1168 {
1169         struct inode *inode = file->f_path.dentry->d_inode;
1170         int fbidx = iminor(inode);
1171         struct fb_info *info = registered_fb[fbidx];
1172
1173         return do_fb_ioctl(info, cmd, arg);
1174 }
1175
1176 #ifdef CONFIG_COMPAT
1177 struct fb_fix_screeninfo32 {
1178         char                    id[16];
1179         compat_caddr_t          smem_start;
1180         u32                     smem_len;
1181         u32                     type;
1182         u32                     type_aux;
1183         u32                     visual;
1184         u16                     xpanstep;
1185         u16                     ypanstep;
1186         u16                     ywrapstep;
1187         u32                     line_length;
1188         compat_caddr_t          mmio_start;
1189         u32                     mmio_len;
1190         u32                     accel;
1191         u16                     reserved[3];
1192 };
1193
1194 struct fb_cmap32 {
1195         u32                     start;
1196         u32                     len;
1197         compat_caddr_t  red;
1198         compat_caddr_t  green;
1199         compat_caddr_t  blue;
1200         compat_caddr_t  transp;
1201 };
1202
1203 static int fb_getput_cmap(struct fb_info *info, unsigned int cmd,
1204                           unsigned long arg)
1205 {
1206         struct fb_cmap_user __user *cmap;
1207         struct fb_cmap32 __user *cmap32;
1208         __u32 data;
1209         int err;
1210
1211         cmap = compat_alloc_user_space(sizeof(*cmap));
1212         cmap32 = compat_ptr(arg);
1213
1214         if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1215                 return -EFAULT;
1216
1217         if (get_user(data, &cmap32->red) ||
1218             put_user(compat_ptr(data), &cmap->red) ||
1219             get_user(data, &cmap32->green) ||
1220             put_user(compat_ptr(data), &cmap->green) ||
1221             get_user(data, &cmap32->blue) ||
1222             put_user(compat_ptr(data), &cmap->blue) ||
1223             get_user(data, &cmap32->transp) ||
1224             put_user(compat_ptr(data), &cmap->transp))
1225                 return -EFAULT;
1226
1227         err = do_fb_ioctl(info, cmd, (unsigned long) cmap);
1228
1229         if (!err) {
1230                 if (copy_in_user(&cmap32->start,
1231                                  &cmap->start,
1232                                  2 * sizeof(__u32)))
1233                         err = -EFAULT;
1234         }
1235         return err;
1236 }
1237
1238 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1239                                   struct fb_fix_screeninfo32 __user *fix32)
1240 {
1241         __u32 data;
1242         int err;
1243
1244         err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1245
1246         data = (__u32) (unsigned long) fix->smem_start;
1247         err |= put_user(data, &fix32->smem_start);
1248
1249         err |= put_user(fix->smem_len, &fix32->smem_len);
1250         err |= put_user(fix->type, &fix32->type);
1251         err |= put_user(fix->type_aux, &fix32->type_aux);
1252         err |= put_user(fix->visual, &fix32->visual);
1253         err |= put_user(fix->xpanstep, &fix32->xpanstep);
1254         err |= put_user(fix->ypanstep, &fix32->ypanstep);
1255         err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1256         err |= put_user(fix->line_length, &fix32->line_length);
1257
1258         data = (__u32) (unsigned long) fix->mmio_start;
1259         err |= put_user(data, &fix32->mmio_start);
1260
1261         err |= put_user(fix->mmio_len, &fix32->mmio_len);
1262         err |= put_user(fix->accel, &fix32->accel);
1263         err |= copy_to_user(fix32->reserved, fix->reserved,
1264                             sizeof(fix->reserved));
1265
1266         return err;
1267 }
1268
1269 static int fb_get_fscreeninfo(struct fb_info *info, unsigned int cmd,
1270                               unsigned long arg)
1271 {
1272         mm_segment_t old_fs;
1273         struct fb_fix_screeninfo fix;
1274         struct fb_fix_screeninfo32 __user *fix32;
1275         int err;
1276
1277         fix32 = compat_ptr(arg);
1278
1279         old_fs = get_fs();
1280         set_fs(KERNEL_DS);
1281         err = do_fb_ioctl(info, cmd, (unsigned long) &fix);
1282         set_fs(old_fs);
1283
1284         if (!err)
1285                 err = do_fscreeninfo_to_user(&fix, fix32);
1286
1287         return err;
1288 }
1289
1290 static long fb_compat_ioctl(struct file *file, unsigned int cmd,
1291                             unsigned long arg)
1292 {
1293         struct inode *inode = file->f_path.dentry->d_inode;
1294         int fbidx = iminor(inode);
1295         struct fb_info *info = registered_fb[fbidx];
1296         struct fb_ops *fb = info->fbops;
1297         long ret = -ENOIOCTLCMD;
1298
1299         switch(cmd) {
1300         case FBIOGET_VSCREENINFO:
1301         case FBIOPUT_VSCREENINFO:
1302         case FBIOPAN_DISPLAY:
1303         case FBIOGET_CON2FBMAP:
1304         case FBIOPUT_CON2FBMAP:
1305                 arg = (unsigned long) compat_ptr(arg);
1306         case FBIOBLANK:
1307                 ret = do_fb_ioctl(info, cmd, arg);
1308                 break;
1309
1310         case FBIOGET_FSCREENINFO:
1311                 ret = fb_get_fscreeninfo(info, cmd, arg);
1312                 break;
1313
1314         case FBIOGETCMAP:
1315         case FBIOPUTCMAP:
1316                 ret = fb_getput_cmap(info, cmd, arg);
1317                 break;
1318
1319         default:
1320                 if (fb->fb_compat_ioctl)
1321                         ret = fb->fb_compat_ioctl(info, cmd, arg);
1322                 break;
1323         }
1324         return ret;
1325 }
1326 #endif
1327
1328 static int
1329 fb_mmap(struct file *file, struct vm_area_struct * vma)
1330 {
1331         int fbidx = iminor(file->f_path.dentry->d_inode);
1332         struct fb_info *info = registered_fb[fbidx];
1333         struct fb_ops *fb = info->fbops;
1334         unsigned long off;
1335         unsigned long start;
1336         u32 len;
1337
1338         if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
1339                 return -EINVAL;
1340         off = vma->vm_pgoff << PAGE_SHIFT;
1341         if (!fb)
1342                 return -ENODEV;
1343         mutex_lock(&info->mm_lock);
1344         if (fb->fb_mmap) {
1345                 int res;
1346                 res = fb->fb_mmap(info, vma);
1347                 mutex_unlock(&info->mm_lock);
1348                 return res;
1349         }
1350
1351         /* frame buffer memory */
1352         start = info->fix.smem_start;
1353         len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
1354         if (off >= len) {
1355                 /* memory mapped io */
1356                 off -= len;
1357                 if (info->var.accel_flags) {
1358                         mutex_unlock(&info->mm_lock);
1359                         return -EINVAL;
1360                 }
1361                 start = info->fix.mmio_start;
1362                 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
1363         }
1364         mutex_unlock(&info->mm_lock);
1365         start &= PAGE_MASK;
1366         if ((vma->vm_end - vma->vm_start + off) > len)
1367                 return -EINVAL;
1368         off += start;
1369         vma->vm_pgoff = off >> PAGE_SHIFT;
1370         /* This is an IO map - tell maydump to skip this VMA */
1371         vma->vm_flags |= VM_IO | VM_RESERVED;
1372         vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
1373         fb_pgprotect(file, vma, off);
1374         if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1375                              vma->vm_end - vma->vm_start, vma->vm_page_prot))
1376                 return -EAGAIN;
1377         return 0;
1378 }
1379
1380 static int
1381 fb_open(struct inode *inode, struct file *file)
1382 __acquires(&info->lock)
1383 __releases(&info->lock)
1384 {
1385         int fbidx = iminor(inode);
1386         struct fb_info *info;
1387         int res = 0;
1388
1389         if (fbidx >= FB_MAX)
1390                 return -ENODEV;
1391         info = registered_fb[fbidx];
1392         if (!info)
1393                 request_module("fb%d", fbidx);
1394         info = registered_fb[fbidx];
1395         if (!info)
1396                 return -ENODEV;
1397         mutex_lock(&info->lock);
1398         if (!try_module_get(info->fbops->owner)) {
1399                 res = -ENODEV;
1400                 goto out;
1401         }
1402         file->private_data = info;
1403         if (info->fbops->fb_open) {
1404                 res = info->fbops->fb_open(info,1);
1405                 if (res)
1406                         module_put(info->fbops->owner);
1407         }
1408 #ifdef CONFIG_FB_DEFERRED_IO
1409         if (info->fbdefio)
1410                 fb_deferred_io_open(info, inode, file);
1411 #endif
1412 out:
1413         mutex_unlock(&info->lock);
1414         return res;
1415 }
1416
1417 static int
1418 fb_release(struct inode *inode, struct file *file)
1419 __acquires(&info->lock)
1420 __releases(&info->lock)
1421 {
1422         struct fb_info * const info = file->private_data;
1423
1424         mutex_lock(&info->lock);
1425         if (info->fbops->fb_release)
1426                 info->fbops->fb_release(info,1);
1427         module_put(info->fbops->owner);
1428         mutex_unlock(&info->lock);
1429         return 0;
1430 }
1431
1432 static const struct file_operations fb_fops = {
1433         .owner =        THIS_MODULE,
1434         .read =         fb_read,
1435         .write =        fb_write,
1436         .unlocked_ioctl = fb_ioctl,
1437 #ifdef CONFIG_COMPAT
1438         .compat_ioctl = fb_compat_ioctl,
1439 #endif
1440         .mmap =         fb_mmap,
1441         .open =         fb_open,
1442         .release =      fb_release,
1443 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1444         .get_unmapped_area = get_fb_unmapped_area,
1445 #endif
1446 #ifdef CONFIG_FB_DEFERRED_IO
1447         .fsync =        fb_deferred_io_fsync,
1448 #endif
1449 };
1450
1451 struct class *fb_class;
1452 EXPORT_SYMBOL(fb_class);
1453
1454 static int fb_check_foreignness(struct fb_info *fi)
1455 {
1456         const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN;
1457
1458         fi->flags &= ~FBINFO_FOREIGN_ENDIAN;
1459
1460 #ifdef __BIG_ENDIAN
1461         fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH;
1462 #else
1463         fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0;
1464 #endif /* __BIG_ENDIAN */
1465
1466         if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) {
1467                 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to "
1468                        "support this framebuffer\n", fi->fix.id);
1469                 return -ENOSYS;
1470         } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) {
1471                 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to "
1472                        "support this framebuffer\n", fi->fix.id);
1473                 return -ENOSYS;
1474         }
1475
1476         return 0;
1477 }
1478
1479 static bool apertures_overlap(struct aperture *gen, struct aperture *hw)
1480 {
1481         /* is the generic aperture base the same as the HW one */
1482         if (gen->base == hw->base)
1483                 return true;
1484         /* is the generic aperture base inside the hw base->hw base+size */
1485         if (gen->base > hw->base && gen->base <= hw->base + hw->size)
1486                 return true;
1487         return false;
1488 }
1489
1490 static bool fb_do_apertures_overlap(struct apertures_struct *gena,
1491                                     struct apertures_struct *hwa)
1492 {
1493         int i, j;
1494         if (!hwa || !gena)
1495                 return false;
1496
1497         for (i = 0; i < hwa->count; ++i) {
1498                 struct aperture *h = &hwa->ranges[i];
1499                 for (j = 0; j < gena->count; ++j) {
1500                         struct aperture *g = &gena->ranges[j];
1501                         printk(KERN_DEBUG "checking generic (%llx %llx) vs hw (%llx %llx)\n",
1502                                 (unsigned long long)g->base,
1503                                 (unsigned long long)g->size,
1504                                 (unsigned long long)h->base,
1505                                 (unsigned long long)h->size);
1506                         if (apertures_overlap(g, h))
1507                                 return true;
1508                 }
1509         }
1510
1511         return false;
1512 }
1513
1514 #define VGA_FB_PHYS 0xA0000
1515 void remove_conflicting_framebuffers(struct apertures_struct *a,
1516                                      const char *name, bool primary)
1517 {
1518         int i;
1519
1520         /* check all firmware fbs and kick off if the base addr overlaps */
1521         for (i = 0 ; i < FB_MAX; i++) {
1522                 struct apertures_struct *gen_aper;
1523                 if (!registered_fb[i])
1524                         continue;
1525
1526                 if (!(registered_fb[i]->flags & FBINFO_MISC_FIRMWARE))
1527                         continue;
1528
1529                 gen_aper = registered_fb[i]->apertures;
1530                 if (fb_do_apertures_overlap(gen_aper, a) ||
1531                         (primary && gen_aper && gen_aper->count &&
1532                          gen_aper->ranges[0].base == VGA_FB_PHYS)) {
1533
1534                         printk(KERN_ERR "fb: conflicting fb hw usage "
1535                                "%s vs %s - removing generic driver\n",
1536                                name, registered_fb[i]->fix.id);
1537                         unregister_framebuffer(registered_fb[i]);
1538                 }
1539         }
1540 }
1541 EXPORT_SYMBOL(remove_conflicting_framebuffers);
1542
1543 /**
1544  *      register_framebuffer - registers a frame buffer device
1545  *      @fb_info: frame buffer info structure
1546  *
1547  *      Registers a frame buffer device @fb_info.
1548  *
1549  *      Returns negative errno on error, or zero for success.
1550  *
1551  */
1552
1553 int
1554 register_framebuffer(struct fb_info *fb_info)
1555 {
1556         int i;
1557         struct fb_event event;
1558         struct fb_videomode mode;
1559
1560         if (num_registered_fb == FB_MAX)
1561                 return -ENXIO;
1562
1563         if (fb_check_foreignness(fb_info))
1564                 return -ENOSYS;
1565
1566         remove_conflicting_framebuffers(fb_info->apertures, fb_info->fix.id,
1567                                          fb_is_primary_device(fb_info));
1568
1569         num_registered_fb++;
1570         for (i = 0 ; i < FB_MAX; i++)
1571                 if (!registered_fb[i])
1572                         break;
1573         fb_info->node = i;
1574         mutex_init(&fb_info->lock);
1575         mutex_init(&fb_info->mm_lock);
1576
1577         fb_info->dev = device_create(fb_class, fb_info->device,
1578                                      MKDEV(FB_MAJOR, i), NULL, "fb%d", i);
1579         if (IS_ERR(fb_info->dev)) {
1580                 /* Not fatal */
1581                 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1582                 fb_info->dev = NULL;
1583         } else
1584                 fb_init_device(fb_info);
1585
1586         if (fb_info->pixmap.addr == NULL) {
1587                 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1588                 if (fb_info->pixmap.addr) {
1589                         fb_info->pixmap.size = FBPIXMAPSIZE;
1590                         fb_info->pixmap.buf_align = 1;
1591                         fb_info->pixmap.scan_align = 1;
1592                         fb_info->pixmap.access_align = 32;
1593                         fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1594                 }
1595         }
1596         fb_info->pixmap.offset = 0;
1597
1598         if (!fb_info->pixmap.blit_x)
1599                 fb_info->pixmap.blit_x = ~(u32)0;
1600
1601         if (!fb_info->pixmap.blit_y)
1602                 fb_info->pixmap.blit_y = ~(u32)0;
1603
1604         if (!fb_info->modelist.prev || !fb_info->modelist.next)
1605                 INIT_LIST_HEAD(&fb_info->modelist);
1606
1607         fb_var_to_videomode(&mode, &fb_info->var);
1608         fb_add_videomode(&mode, &fb_info->modelist);
1609         registered_fb[i] = fb_info;
1610
1611         event.info = fb_info;
1612         if (!lock_fb_info(fb_info))
1613                 return -ENODEV;
1614         fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1615         unlock_fb_info(fb_info);
1616         return 0;
1617 }
1618
1619
1620 /**
1621  *      unregister_framebuffer - releases a frame buffer device
1622  *      @fb_info: frame buffer info structure
1623  *
1624  *      Unregisters a frame buffer device @fb_info.
1625  *
1626  *      Returns negative errno on error, or zero for success.
1627  *
1628  *      This function will also notify the framebuffer console
1629  *      to release the driver.
1630  *
1631  *      This is meant to be called within a driver's module_exit()
1632  *      function. If this is called outside module_exit(), ensure
1633  *      that the driver implements fb_open() and fb_release() to
1634  *      check that no processes are using the device.
1635  */
1636
1637 int
1638 unregister_framebuffer(struct fb_info *fb_info)
1639 {
1640         struct fb_event event;
1641         int i, ret = 0;
1642
1643         i = fb_info->node;
1644         if (!registered_fb[i]) {
1645                 ret = -EINVAL;
1646                 goto done;
1647         }
1648
1649
1650         if (!lock_fb_info(fb_info))
1651                 return -ENODEV;
1652         event.info = fb_info;
1653         ret = fb_notifier_call_chain(FB_EVENT_FB_UNBIND, &event);
1654         unlock_fb_info(fb_info);
1655
1656         if (ret) {
1657                 ret = -EINVAL;
1658                 goto done;
1659         }
1660
1661         if (fb_info->pixmap.addr &&
1662             (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1663                 kfree(fb_info->pixmap.addr);
1664         fb_destroy_modelist(&fb_info->modelist);
1665         registered_fb[i]=NULL;
1666         num_registered_fb--;
1667         fb_cleanup_device(fb_info);
1668         device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1669         event.info = fb_info;
1670         fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1671
1672         /* this may free fb info */
1673         if (fb_info->fbops->fb_destroy)
1674                 fb_info->fbops->fb_destroy(fb_info);
1675 done:
1676         return ret;
1677 }
1678
1679 /**
1680  *      fb_set_suspend - low level driver signals suspend
1681  *      @info: framebuffer affected
1682  *      @state: 0 = resuming, !=0 = suspending
1683  *
1684  *      This is meant to be used by low level drivers to
1685  *      signal suspend/resume to the core & clients.
1686  *      It must be called with the console semaphore held
1687  */
1688 void fb_set_suspend(struct fb_info *info, int state)
1689 {
1690         struct fb_event event;
1691
1692         if (!lock_fb_info(info))
1693                 return;
1694         event.info = info;
1695         if (state) {
1696                 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event);
1697                 info->state = FBINFO_STATE_SUSPENDED;
1698         } else {
1699                 info->state = FBINFO_STATE_RUNNING;
1700                 fb_notifier_call_chain(FB_EVENT_RESUME, &event);
1701         }
1702         unlock_fb_info(info);
1703 }
1704
1705 /**
1706  *      fbmem_init - init frame buffer subsystem
1707  *
1708  *      Initialize the frame buffer subsystem.
1709  *
1710  *      NOTE: This function is _only_ to be called by drivers/char/mem.c.
1711  *
1712  */
1713
1714 static int __init
1715 fbmem_init(void)
1716 {
1717         proc_create("fb", 0, NULL, &fb_proc_fops);
1718
1719         if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1720                 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1721
1722         fb_class = class_create(THIS_MODULE, "graphics");
1723         if (IS_ERR(fb_class)) {
1724                 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1725                 fb_class = NULL;
1726         }
1727         return 0;
1728 }
1729
1730 #ifdef MODULE
1731 module_init(fbmem_init);
1732 static void __exit
1733 fbmem_exit(void)
1734 {
1735         remove_proc_entry("fb", NULL);
1736         class_destroy(fb_class);
1737         unregister_chrdev(FB_MAJOR, "fb");
1738 }
1739
1740 module_exit(fbmem_exit);
1741 MODULE_LICENSE("GPL");
1742 MODULE_DESCRIPTION("Framebuffer base");
1743 #else
1744 subsys_initcall(fbmem_init);
1745 #endif
1746
1747 int fb_new_modelist(struct fb_info *info)
1748 {
1749         struct fb_event event;
1750         struct fb_var_screeninfo var = info->var;
1751         struct list_head *pos, *n;
1752         struct fb_modelist *modelist;
1753         struct fb_videomode *m, mode;
1754         int err = 1;
1755
1756         list_for_each_safe(pos, n, &info->modelist) {
1757                 modelist = list_entry(pos, struct fb_modelist, list);
1758                 m = &modelist->mode;
1759                 fb_videomode_to_var(&var, m);
1760                 var.activate = FB_ACTIVATE_TEST;
1761                 err = fb_set_var(info, &var);
1762                 fb_var_to_videomode(&mode, &var);
1763                 if (err || !fb_mode_is_equal(m, &mode)) {
1764                         list_del(pos);
1765                         kfree(pos);
1766                 }
1767         }
1768
1769         err = 1;
1770
1771         if (!list_empty(&info->modelist)) {
1772                 if (!lock_fb_info(info))
1773                         return -ENODEV;
1774                 event.info = info;
1775                 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
1776                 unlock_fb_info(info);
1777         }
1778
1779         return err;
1780 }
1781
1782 static char *video_options[FB_MAX] __read_mostly;
1783 static int ofonly __read_mostly;
1784
1785 /**
1786  * fb_get_options - get kernel boot parameters
1787  * @name:   framebuffer name as it would appear in
1788  *          the boot parameter line
1789  *          (video=<name>:<options>)
1790  * @option: the option will be stored here
1791  *
1792  * NOTE: Needed to maintain backwards compatibility
1793  */
1794 int fb_get_options(char *name, char **option)
1795 {
1796         char *opt, *options = NULL;
1797         int retval = 0;
1798         int name_len = strlen(name), i;
1799
1800         if (name_len && ofonly && strncmp(name, "offb", 4))
1801                 retval = 1;
1802
1803         if (name_len && !retval) {
1804                 for (i = 0; i < FB_MAX; i++) {
1805                         if (video_options[i] == NULL)
1806                                 continue;
1807                         if (!video_options[i][0])
1808                                 continue;
1809                         opt = video_options[i];
1810                         if (!strncmp(name, opt, name_len) &&
1811                             opt[name_len] == ':')
1812                                 options = opt + name_len + 1;
1813                 }
1814         }
1815         if (options && !strncmp(options, "off", 3))
1816                 retval = 1;
1817
1818         if (option)
1819                 *option = options;
1820
1821         return retval;
1822 }
1823
1824 #ifndef MODULE
1825 /**
1826  *      video_setup - process command line options
1827  *      @options: string of options
1828  *
1829  *      Process command line options for frame buffer subsystem.
1830  *
1831  *      NOTE: This function is a __setup and __init function.
1832  *            It only stores the options.  Drivers have to call
1833  *            fb_get_options() as necessary.
1834  *
1835  *      Returns zero.
1836  *
1837  */
1838 static int __init video_setup(char *options)
1839 {
1840         int i, global = 0;
1841
1842         if (!options || !*options)
1843                 global = 1;
1844
1845         if (!global && !strncmp(options, "ofonly", 6)) {
1846                 ofonly = 1;
1847                 global = 1;
1848         }
1849
1850         if (!global && !strchr(options, ':')) {
1851                 fb_mode_option = options;
1852                 global = 1;
1853         }
1854
1855         if (!global) {
1856                 for (i = 0; i < FB_MAX; i++) {
1857                         if (video_options[i] == NULL) {
1858                                 video_options[i] = options;
1859                                 break;
1860                         }
1861
1862                 }
1863         }
1864
1865         return 1;
1866 }
1867 __setup("video=", video_setup);
1868 #endif
1869
1870     /*
1871      *  Visible symbols for modules
1872      */
1873
1874 EXPORT_SYMBOL(register_framebuffer);
1875 EXPORT_SYMBOL(unregister_framebuffer);
1876 EXPORT_SYMBOL(num_registered_fb);
1877 EXPORT_SYMBOL(registered_fb);
1878 EXPORT_SYMBOL(fb_show_logo);
1879 EXPORT_SYMBOL(fb_set_var);
1880 EXPORT_SYMBOL(fb_blank);
1881 EXPORT_SYMBOL(fb_pan_display);
1882 EXPORT_SYMBOL(fb_get_buffer_offset);
1883 EXPORT_SYMBOL(fb_set_suspend);
1884 EXPORT_SYMBOL(fb_get_options);
1885
1886 MODULE_LICENSE("GPL");