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/smp_lock.h>
  20 #include <linux/kernel.h>
  21 #include <linux/major.h>
  22 #include <linux/slab.h>
  23 #include <linux/mm.h>
  24 #include <linux/mman.h>
  25 #include <linux/vt.h>
  26 #include <linux/init.h>
  27 #include <linux/linux_logo.h>
  28 #include <linux/proc_fs.h>
  29 #include <linux/seq_file.h>
  30 #include <linux/console.h>
  31 #include <linux/kmod.h>
  32 #include <linux/err.h>
  33 #include <linux/device.h>
  34 #include <linux/efi.h>
  35 #include <linux/fb.h>
  36
  37 #include <asm/fb.h>
  38
  39
  40     /*
  41      *  Frame buffer device initialization and setup routines
  42      */
  43
  44 #define FBPIXMAPSIZE    (1024 * 8)
  45
  46 struct fb_info *registered_fb[FB_MAX] __read_mostly;
  47 int num_registered_fb __read_mostly;
  48
  49 int lock_fb_info(struct fb_info *info)
  50 {
  51         mutex_lock(&info->lock);
  52         if (!info->fbops) {
  53                 mutex_unlock(&info->lock);
  54                 return 0;
  55         }
  56         return 1;
  57 }
  58 EXPORT_SYMBOL(lock_fb_info);
  59
  60 /*
  61  * Helpers
  62  */
  63
  64 int fb_get_color_depth(struct fb_var_screeninfo *var,
  65                        struct fb_fix_screeninfo *fix)
  66 {
  67         int depth = 0;
  68
  69         if (fix->visual == FB_VISUAL_MONO01 ||
  70             fix->visual == FB_VISUAL_MONO10)
  71                 depth = 1;
  72         else {
  73                 if (var->green.length == var->blue.length &&
  74                     var->green.length == var->red.length &&
  75                     var->green.offset == var->blue.offset &&
  76                     var->green.offset == var->red.offset)
  77                         depth = var->green.length;
  78                 else
  79                         depth = var->green.length + var->red.length +
  80                                 var->blue.length;
  81         }
  82
  83         return depth;
  84 }
  85 EXPORT_SYMBOL(fb_get_color_depth);
  86
  87 /*
  88  * Data padding functions.
  89  */
  90 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
  91 {
  92         __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
  93 }
  94 EXPORT_SYMBOL(fb_pad_aligned_buffer);
  95
  96 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
  97                                 u32 shift_high, u32 shift_low, u32 mod)
  98 {
  99         u8 mask = (u8) (0xfff << shift_high), tmp;
 100         int i, j;
 101
 102         for (i = height; i--; ) {
 103                 for (j = 0; j < idx; j++) {
 104                         tmp = dst[j];
 105                         tmp &= mask;
 106                         tmp |= *src >> shift_low;
 107                         dst[j] = tmp;
 108                         tmp = *src << shift_high;
 109                         dst[j+1] = tmp;
 110                         src++;
 111                 }
 112                 tmp = dst[idx];
 113                 tmp &= mask;
 114                 tmp |= *src >> shift_low;
 115                 dst[idx] = tmp;
 116                 if (shift_high < mod) {
 117                         tmp = *src << shift_high;
 118                         dst[idx+1] = tmp;
 119                 }
 120                 src++;
 121                 dst += d_pitch;
 122         }
 123 }
 124 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
 125
 126 /*
 127  * we need to lock this section since fb_cursor
 128  * may use fb_imageblit()
 129  */
 130 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
 131 {
 132         u32 align = buf->buf_align - 1, offset;
 133         char *addr = buf->addr;
 134
 135         /* If IO mapped, we need to sync before access, no sharing of
 136          * the pixmap is done
 137          */
 138         if (buf->flags & FB_PIXMAP_IO) {
 139                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 140                         info->fbops->fb_sync(info);
 141                 return addr;
 142         }
 143
 144         /* See if we fit in the remaining pixmap space */
 145         offset = buf->offset + align;
 146         offset &= ~align;
 147         if (offset + size > buf->size) {
 148                 /* We do not fit. In order to be able to re-use the buffer,
 149                  * we must ensure no asynchronous DMA'ing or whatever operation
 150                  * is in progress, we sync for that.
 151                  */
 152                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 153                         info->fbops->fb_sync(info);
 154                 offset = 0;
 155         }
 156         buf->offset = offset + size;
 157         addr += offset;
 158
 159         return addr;
 160 }
 161
 162 #ifdef CONFIG_LOGO
 163
 164 static inline unsigned safe_shift(unsigned d, int n)
 165 {
 166         return n < 0 ? d >> -n : d << n;
 167 }
 168
 169 static void fb_set_logocmap(struct fb_info *info,
 170                                    const struct linux_logo *logo)
 171 {
 172         struct fb_cmap palette_cmap;
 173         u16 palette_green[16];
 174         u16 palette_blue[16];
 175         u16 palette_red[16];
 176         int i, j, n;
 177         const unsigned char *clut = logo->clut;
 178
 179         palette_cmap.start = 0;
 180         palette_cmap.len = 16;
 181         palette_cmap.red = palette_red;
 182         palette_cmap.green = palette_green;
 183         palette_cmap.blue = palette_blue;
 184         palette_cmap.transp = NULL;
 185
 186         for (i = 0; i < logo->clutsize; i += n) {
 187                 n = logo->clutsize - i;
 188                 /* palette_cmap provides space for only 16 colors at once */
 189                 if (n > 16)
 190                         n = 16;
 191                 palette_cmap.start = 32 + i;
 192                 palette_cmap.len = n;
 193                 for (j = 0; j < n; ++j) {
 194                         palette_cmap.red[j] = clut[0] << 8 | clut[0];
 195                         palette_cmap.green[j] = clut[1] << 8 | clut[1];
 196                         palette_cmap.blue[j] = clut[2] << 8 | clut[2];
 197                         clut += 3;
 198                 }
 199                 fb_set_cmap(&palette_cmap, info);
 200         }
 201 }
 202
 203 static void  fb_set_logo_truepalette(struct fb_info *info,
 204                                             const struct linux_logo *logo,
 205                                             u32 *palette)
 206 {
 207         static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
 208         unsigned char redmask, greenmask, bluemask;
 209         int redshift, greenshift, blueshift;
 210         int i;
 211         const unsigned char *clut = logo->clut;
 212
 213         /*
 214          * We have to create a temporary palette since console palette is only
 215          * 16 colors long.
 216          */
 217         /* Bug: Doesn't obey msb_right ... (who needs that?) */
 218         redmask   = mask[info->var.red.length   < 8 ? info->var.red.length   : 8];
 219         greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
 220         bluemask  = mask[info->var.blue.length  < 8 ? info->var.blue.length  : 8];
 221         redshift   = info->var.red.offset   - (8 - info->var.red.length);
 222         greenshift = info->var.green.offset - (8 - info->var.green.length);
 223         blueshift  = info->var.blue.offset  - (8 - info->var.blue.length);
 224
 225         for ( i = 0; i < logo->clutsize; i++) {
 226                 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
 227                                  safe_shift((clut[1] & greenmask), greenshift) |
 228                                  safe_shift((clut[2] & bluemask), blueshift));
 229                 clut += 3;
 230         }
 231 }
 232
 233 static void fb_set_logo_directpalette(struct fb_info *info,
 234                                              const struct linux_logo *logo,
 235                                              u32 *palette)
 236 {
 237         int redshift, greenshift, blueshift;
 238         int i;
 239
 240         redshift = info->var.red.offset;
 241         greenshift = info->var.green.offset;
 242         blueshift = info->var.blue.offset;
 243
 244         for (i = 32; i < 32 + logo->clutsize; i++)
 245                 palette[i] = i << redshift | i << greenshift | i << blueshift;
 246 }
 247
 248 static void fb_set_logo(struct fb_info *info,
 249                                const struct linux_logo *logo, u8 *dst,
 250                                int depth)
 251 {
 252         int i, j, k;
 253         const u8 *src = logo->data;
 254         u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
 255         u8 fg = 1, d;
 256
 257         switch (fb_get_color_depth(&info->var, &info->fix)) {
 258         case 1:
 259                 fg = 1;
 260                 break;
 261         case 2:
 262                 fg = 3;
 263                 break;
 264         default:
 265                 fg = 7;
 266                 break;
 267         }
 268
 269         if (info->fix.visual == FB_VISUAL_MONO01 ||
 270             info->fix.visual == FB_VISUAL_MONO10)
 271                 fg = ~((u8) (0xfff << info->var.green.length));
 272
 273         switch (depth) {
 274         case 4:
 275                 for (i = 0; i < logo->height; i++)
 276                         for (j = 0; j < logo->width; src++) {
 277                                 *dst++ = *src >> 4;
 278                                 j++;
 279                                 if (j < logo->width) {
 280                                         *dst++ = *src & 0x0f;
 281                                         j++;
 282                                 }
 283                         }
 284                 break;
 285         case 1:
 286                 for (i = 0; i < logo->height; i++) {
 287                         for (j = 0; j < logo->width; src++) {
 288                                 d = *src ^ xor;
 289                                 for (k = 7; k >= 0; k--) {
 290                                         *dst++ = ((d >> k) & 1) ? fg : 0;
 291                                         j++;
 292                                 }
 293                         }
 294                 }
 295                 break;
 296         }
 297 }
 298
 299 /*
 300  * Three (3) kinds of logo maps exist.  linux_logo_clut224 (>16 colors),
 301  * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors).  Depending on
 302  * the visual format and color depth of the framebuffer, the DAC, the
 303  * pseudo_palette, and the logo data will be adjusted accordingly.
 304  *
 305  * Case 1 - linux_logo_clut224:
 306  * Color exceeds the number of console colors (16), thus we set the hardware DAC
 307  * using fb_set_cmap() appropriately.  The "needs_cmapreset"  flag will be set.
 308  *
 309  * For visuals that require color info from the pseudo_palette, we also construct
 310  * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
 311  * will be set.
 312  *
 313  * Case 2 - linux_logo_vga16:
 314  * The number of colors just matches the console colors, thus there is no need
 315  * to set the DAC or the pseudo_palette.  However, the bitmap is packed, ie,
 316  * each byte contains color information for two pixels (upper and lower nibble).
 317  * To be consistent with fb_imageblit() usage, we therefore separate the two
 318  * nibbles into separate bytes. The "depth" flag will be set to 4.
 319  *
 320  * Case 3 - linux_logo_mono:
 321  * This is similar with Case 2.  Each byte contains information for 8 pixels.
 322  * We isolate each bit and expand each into a byte. The "depth" flag will
 323  * be set to 1.
 324  */
 325 static struct logo_data {
 326         int depth;
 327         int needs_directpalette;
 328         int needs_truepalette;
 329         int needs_cmapreset;
 330         const struct linux_logo *logo;
 331 } fb_logo __read_mostly;
 332
 333 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
 334 {
 335         u32 size = width * height, i;
 336
 337         out += size - 1;
 338
 339         for (i = size; i--; )
 340                 *out-- = *in++;
 341 }
 342
 343 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
 344 {
 345         int i, j, h = height - 1;
 346
 347         for (i = 0; i < height; i++)
 348                 for (j = 0; j < width; j++)
 349                                 out[height * j + h - i] = *in++;
 350 }
 351
 352 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
 353 {
 354         int i, j, w = width - 1;
 355
 356         for (i = 0; i < height; i++)
 357                 for (j = 0; j < width; j++)
 358                         out[height * (w - j) + i] = *in++;
 359 }
 360
 361 static void fb_rotate_logo(struct fb_info *info, u8 *dst,
 362                            struct fb_image *image, int rotate)
 363 {
 364         u32 tmp;
 365
 366         if (rotate == FB_ROTATE_UD) {
 367                 fb_rotate_logo_ud(image->data, dst, image->width,
 368                                   image->height);
 369                 image->dx = info->var.xres - image->width - image->dx;
 370                 image->dy = info->var.yres - image->height - image->dy;
 371         } else if (rotate == FB_ROTATE_CW) {
 372                 fb_rotate_logo_cw(image->data, dst, image->width,
 373                                   image->height);
 374                 tmp = image->width;
 375                 image->width = image->height;
 376                 image->height = tmp;
 377                 tmp = image->dy;
 378                 image->dy = image->dx;
 379                 image->dx = info->var.xres - image->width - tmp;
 380         } else if (rotate == FB_ROTATE_CCW) {
 381                 fb_rotate_logo_ccw(image->data, dst, image->width,
 382                                    image->height);
 383                 tmp = image->width;
 384                 image->width = image->height;
 385                 image->height = tmp;
 386                 tmp = image->dx;
 387                 image->dx = image->dy;
 388                 image->dy = info->var.yres - image->height - tmp;
 389         }
 390
 391         image->data = dst;
 392 }
 393
 394 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
 395                             int rotate, unsigned int num)
 396 {
 397         unsigned int x;
 398
 399         if (rotate == FB_ROTATE_UR) {
 400                 for (x = 0;
 401                      x < num && image->dx + image->width <= info->var.xres;
 402                      x++) {
 403                         info->fbops->fb_imageblit(info, image);
 404                         image->dx += image->width + 8;
 405                 }
 406         } else if (rotate == FB_ROTATE_UD) {
 407                 for (x = 0; x < num && image->dx >= 0; x++) {
 408                         info->fbops->fb_imageblit(info, image);
 409                         image->dx -= image->width + 8;
 410                 }
 411         } else if (rotate == FB_ROTATE_CW) {
 412                 for (x = 0;
 413                      x < num && image->dy + image->height <= info->var.yres;
 414                      x++) {
 415                         info->fbops->fb_imageblit(info, image);
 416                         image->dy += image->height + 8;
 417                 }
 418         } else if (rotate == FB_ROTATE_CCW) {
 419                 for (x = 0; x < num && image->dy >= 0; x++) {
 420                         info->fbops->fb_imageblit(info, image);
 421                         image->dy -= image->height + 8;
 422                 }
 423         }
 424 }
 425
 426 static int fb_show_logo_line(struct fb_info *info, int rotate,
 427                              const struct linux_logo *logo, int y,
 428                              unsigned int n)
 429 {
 430         u32 *palette = NULL, *saved_pseudo_palette = NULL;
 431         unsigned char *logo_new = NULL, *logo_rotate = NULL;
 432         struct fb_image image;
 433
 434         /* Return if the frame buffer is not mapped or suspended */
 435         if (logo == NULL || info->state != FBINFO_STATE_RUNNING ||
 436             info->flags & FBINFO_MODULE)
 437                 return 0;
 438
 439         image.depth = 8;
 440         image.data = logo->data;
 441
 442         if (fb_logo.needs_cmapreset)
 443                 fb_set_logocmap(info, logo);
 444
 445         if (fb_logo.needs_truepalette ||
 446             fb_logo.needs_directpalette) {
 447                 palette = kmalloc(256 * 4, GFP_KERNEL);
 448                 if (palette == NULL)
 449                         return 0;
 450
 451                 if (fb_logo.needs_truepalette)
 452                         fb_set_logo_truepalette(info, logo, palette);
 453                 else
 454                         fb_set_logo_directpalette(info, logo, palette);
 455
 456                 saved_pseudo_palette = info->pseudo_palette;
 457                 info->pseudo_palette = palette;
 458         }
 459
 460         if (fb_logo.depth <= 4) {
 461                 logo_new = kmalloc(logo->width * logo->height, GFP_KERNEL);
 462                 if (logo_new == NULL) {
 463                         kfree(palette);
 464                         if (saved_pseudo_palette)
 465                                 info->pseudo_palette = saved_pseudo_palette;
 466                         return 0;
 467                 }
 468                 image.data = logo_new;
 469                 fb_set_logo(info, logo, logo_new, fb_logo.depth);
 470         }
 471
 472         image.dx = 0;
 473         image.dy = y;
 474         image.width = logo->width;
 475         image.height = logo->height;
 476
 477         if (rotate) {
 478                 logo_rotate = kmalloc(logo->width *
 479                                       logo->height, GFP_KERNEL);
 480                 if (logo_rotate)
 481                         fb_rotate_logo(info, logo_rotate, &image, rotate);
 482         }
 483
 484         fb_do_show_logo(info, &image, rotate, n);
 485
 486         kfree(palette);
 487         if (saved_pseudo_palette != NULL)
 488                 info->pseudo_palette = saved_pseudo_palette;
 489         kfree(logo_new);
 490         kfree(logo_rotate);
 491         return logo->height;
 492 }
 493
 494
 495 #ifdef CONFIG_FB_LOGO_EXTRA
 496
 497 #define FB_LOGO_EX_NUM_MAX 10
 498 static struct logo_data_extra {
 499         const struct linux_logo *logo;
 500         unsigned int n;
 501 } fb_logo_ex[FB_LOGO_EX_NUM_MAX];
 502 static unsigned int fb_logo_ex_num;
 503
 504 void fb_append_extra_logo(const struct linux_logo *logo, unsigned int n)
 505 {
 506         if (!n || fb_logo_ex_num == FB_LOGO_EX_NUM_MAX)
 507                 return;
 508
 509         fb_logo_ex[fb_logo_ex_num].logo = logo;
 510         fb_logo_ex[fb_logo_ex_num].n = n;
 511         fb_logo_ex_num++;
 512 }
 513
 514 static int fb_prepare_extra_logos(struct fb_info *info, unsigned int height,
 515                                   unsigned int yres)
 516 {
 517         unsigned int i;
 518
 519         /* FIXME: logo_ex supports only truecolor fb. */
 520         if (info->fix.visual != FB_VISUAL_TRUECOLOR)
 521                 fb_logo_ex_num = 0;
 522
 523         for (i = 0; i < fb_logo_ex_num; i++) {
 524                 if (fb_logo_ex[i].logo->type != fb_logo.logo->type) {
 525                         fb_logo_ex[i].logo = NULL;
 526                         continue;
 527                 }
 528                 height += fb_logo_ex[i].logo->height;
 529                 if (height > yres) {
 530                         height -= fb_logo_ex[i].logo->height;
 531                         fb_logo_ex_num = i;
 532                         break;
 533                 }
 534         }
 535         return height;
 536 }
 537
 538 static int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
 539 {
 540         unsigned int i;
 541
 542         for (i = 0; i < fb_logo_ex_num; i++)
 543                 y += fb_show_logo_line(info, rotate,
 544                                        fb_logo_ex[i].logo, y, fb_logo_ex[i].n);
 545
 546         return y;
 547 }
 548
 549 #else /* !CONFIG_FB_LOGO_EXTRA */
 550
 551 static inline int fb_prepare_extra_logos(struct fb_info *info,
 552                                          unsigned int height,
 553                                          unsigned int yres)
 554 {
 555         return height;
 556 }
 557
 558 static inline int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
 559 {
 560         return y;
 561 }
 562
 563 #endif /* CONFIG_FB_LOGO_EXTRA */
 564
 565
 566 int fb_prepare_logo(struct fb_info *info, int rotate)
 567 {
 568         int depth = fb_get_color_depth(&info->var, &info->fix);
 569         unsigned int yres;
 570
 571         memset(&fb_logo, 0, sizeof(struct logo_data));
 572
 573         if (info->flags & FBINFO_MISC_TILEBLITTING ||
 574             info->flags & FBINFO_MODULE)
 575                 return 0;
 576
 577         if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
 578                 depth = info->var.blue.length;
 579                 if (info->var.red.length < depth)
 580                         depth = info->var.red.length;
 581                 if (info->var.green.length < depth)
 582                         depth = info->var.green.length;
 583         }
 584
 585         if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) {
 586                 /* assume console colormap */
 587                 depth = 4;
 588         }
 589
 590         /* Return if no suitable logo was found */
 591         fb_logo.logo = fb_find_logo(depth);
 592
 593         if (!fb_logo.logo) {
 594                 return 0;
 595         }
 596
 597         if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
 598                 yres = info->var.yres;
 599         else
 600                 yres = info->var.xres;
 601
 602         if (fb_logo.logo->height > yres) {
 603                 fb_logo.logo = NULL;
 604                 return 0;
 605         }
 606
 607         /* What depth we asked for might be different from what we get */
 608         if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
 609                 fb_logo.depth = 8;
 610         else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
 611                 fb_logo.depth = 4;
 612         else
 613                 fb_logo.depth = 1;
 614
 615
 616         if (fb_logo.depth > 4 && depth > 4) {
 617                 switch (info->fix.visual) {
 618                 case FB_VISUAL_TRUECOLOR:
 619                         fb_logo.needs_truepalette = 1;
 620                         break;
 621                 case FB_VISUAL_DIRECTCOLOR:
 622                         fb_logo.needs_directpalette = 1;
 623                         fb_logo.needs_cmapreset = 1;
 624                         break;
 625                 case FB_VISUAL_PSEUDOCOLOR:
 626                         fb_logo.needs_cmapreset = 1;
 627                         break;
 628                 }
 629         }
 630
 631         return fb_prepare_extra_logos(info, fb_logo.logo->height, yres);
 632 }
 633
 634 int fb_show_logo(struct fb_info *info, int rotate)
 635 {
 636         int y;
 637
 638         y = fb_show_logo_line(info, rotate, fb_logo.logo, 0,
 639                               num_online_cpus());
 640         y = fb_show_extra_logos(info, y, rotate);
 641
 642         return y;
 643 }
 644 #else
 645 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
 646 int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
 647 #endif /* CONFIG_LOGO */
 648
 649 static void *fb_seq_start(struct seq_file *m, loff_t *pos)
 650 {
 651         return (*pos < FB_MAX) ? pos : NULL;
 652 }
 653
 654 static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos)
 655 {
 656         (*pos)++;
 657         return (*pos < FB_MAX) ? pos : NULL;
 658 }
 659
 660 static void fb_seq_stop(struct seq_file *m, void *v)
 661 {
 662 }
 663
 664 static int fb_seq_show(struct seq_file *m, void *v)
 665 {
 666         int i = *(loff_t *)v;
 667         struct fb_info *fi = registered_fb[i];
 668
 669         if (fi)
 670                 seq_printf(m, "%d %s\n", fi->node, fi->fix.id);
 671         return 0;
 672 }
 673
 674 static const struct seq_operations proc_fb_seq_ops = {
 675         .start  = fb_seq_start,
 676         .next   = fb_seq_next,
 677         .stop   = fb_seq_stop,
 678         .show   = fb_seq_show,
 679 };
 680
 681 static int proc_fb_open(struct inode *inode, struct file *file)
 682 {
 683         return seq_open(file, &proc_fb_seq_ops);
 684 }
 685
 686 static const struct file_operations fb_proc_fops = {
 687         .owner          = THIS_MODULE,
 688         .open           = proc_fb_open,
 689         .read           = seq_read,
 690         .llseek         = seq_lseek,
 691         .release        = seq_release,
 692 };
 693
 694 static ssize_t
 695 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 696 {
 697         unsigned long p = *ppos;
 698         struct inode *inode = file->f_path.dentry->d_inode;
 699         int fbidx = iminor(inode);
 700         struct fb_info *info = registered_fb[fbidx];
 701         u32 *buffer, *dst;
 702         u32 __iomem *src;
 703         int c, i, cnt = 0, err = 0;
 704         unsigned long total_size;
 705
 706         if (!info || ! info->screen_base)
 707                 return -ENODEV;
 708
 709         if (info->state != FBINFO_STATE_RUNNING)
 710                 return -EPERM;
 711
 712         if (info->fbops->fb_read)
 713                 return info->fbops->fb_read(info, buf, count, ppos);
 714
 715         total_size = info->screen_size;
 716
 717         if (total_size == 0)
 718                 total_size = info->fix.smem_len;
 719
 720         if (p >= total_size)
 721                 return 0;
 722
 723         if (count >= total_size)
 724                 count = total_size;
 725
 726         if (count + p > total_size)
 727                 count = total_size - p;
 728
 729         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 730                          GFP_KERNEL);
 731         if (!buffer)
 732                 return -ENOMEM;
 733
 734         src = (u32 __iomem *) (info->screen_base + p);
 735
 736         if (info->fbops->fb_sync)
 737                 info->fbops->fb_sync(info);
 738
 739         while (count) {
 740                 c  = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 741                 dst = buffer;
 742                 for (i = c >> 2; i--; )
 743                         *dst++ = fb_readl(src++);
 744                 if (c & 3) {
 745                         u8 *dst8 = (u8 *) dst;
 746                         u8 __iomem *src8 = (u8 __iomem *) src;
 747
 748                         for (i = c & 3; i--;)
 749                                 *dst8++ = fb_readb(src8++);
 750
 751                         src = (u32 __iomem *) src8;
 752                 }
 753
 754                 if (copy_to_user(buf, buffer, c)) {
 755                         err = -EFAULT;
 756                         break;
 757                 }
 758                 *ppos += c;
 759                 buf += c;
 760                 cnt += c;
 761                 count -= c;
 762         }
 763
 764         kfree(buffer);
 765
 766         return (err) ? err : cnt;
 767 }
 768
 769 static ssize_t
 770 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 771 {
 772         unsigned long p = *ppos;
 773         struct inode *inode = file->f_path.dentry->d_inode;
 774         int fbidx = iminor(inode);
 775         struct fb_info *info = registered_fb[fbidx];
 776         u32 *buffer, *src;
 777         u32 __iomem *dst;
 778         int c, i, cnt = 0, err = 0;
 779         unsigned long total_size;
 780
 781         if (!info || !info->screen_base)
 782                 return -ENODEV;
 783
 784         if (info->state != FBINFO_STATE_RUNNING)
 785                 return -EPERM;
 786
 787         if (info->fbops->fb_write)
 788                 return info->fbops->fb_write(info, buf, count, ppos);
 789
 790         total_size = info->screen_size;
 791
 792         if (total_size == 0)
 793                 total_size = info->fix.smem_len;
 794
 795         if (p > total_size)
 796                 return -EFBIG;
 797
 798         if (count > total_size) {
 799                 err = -EFBIG;
 800                 count = total_size;
 801         }
 802
 803         if (count + p > total_size) {
 804                 if (!err)
 805                         err = -ENOSPC;
 806
 807                 count = total_size - p;
 808         }
 809
 810         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 811                          GFP_KERNEL);
 812         if (!buffer)
 813                 return -ENOMEM;
 814
 815         dst = (u32 __iomem *) (info->screen_base + p);
 816
 817         if (info->fbops->fb_sync)
 818                 info->fbops->fb_sync(info);
 819
 820         while (count) {
 821                 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 822                 src = buffer;
 823
 824                 if (copy_from_user(src, buf, c)) {
 825                         err = -EFAULT;
 826                         break;
 827                 }
 828
 829                 for (i = c >> 2; i--; )
 830                         fb_writel(*src++, dst++);
 831
 832                 if (c & 3) {
 833                         u8 *src8 = (u8 *) src;
 834                         u8 __iomem *dst8 = (u8 __iomem *) dst;
 835
 836                         for (i = c & 3; i--; )
 837                                 fb_writeb(*src8++, dst8++);
 838
 839                         dst = (u32 __iomem *) dst8;
 840                 }
 841
 842                 *ppos += c;
 843                 buf += c;
 844                 cnt += c;
 845                 count -= c;
 846         }
 847
 848         kfree(buffer);
 849
 850         return (cnt) ? cnt : err;
 851 }
 852
 853 int
 854 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
 855 {
 856         struct fb_fix_screeninfo *fix = &info->fix;
 857         unsigned int yres = info->var.yres;
 858         int err = 0;
 859
 860         if (var->yoffset > 0) {
 861                 if (var->vmode & FB_VMODE_YWRAP) {
 862                         if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
 863                                 err = -EINVAL;
 864                         else
 865                                 yres = 0;
 866                 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
 867                         err = -EINVAL;
 868         }
 869
 870         if (var->xoffset > 0 && (!fix->xpanstep ||
 871                                  (var->xoffset % fix->xpanstep)))
 872                 err = -EINVAL;
 873
 874         if (err || !info->fbops->fb_pan_display ||
 875             var->yoffset + yres > info->var.yres_virtual ||
 876             var->xoffset + info->var.xres > info->var.xres_virtual)
 877                 return -EINVAL;
 878
 879         if ((err = info->fbops->fb_pan_display(var, info)))
 880                 return err;
 881         info->var.xoffset = var->xoffset;
 882         info->var.yoffset = var->yoffset;
 883         if (var->vmode & FB_VMODE_YWRAP)
 884                 info->var.vmode |= FB_VMODE_YWRAP;
 885         else
 886                 info->var.vmode &= ~FB_VMODE_YWRAP;
 887         return 0;
 888 }
 889
 890 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var,
 891                          u32 activate)
 892 {
 893         struct fb_event event;
 894         struct fb_blit_caps caps, fbcaps;
 895         int err = 0;
 896
 897         memset(&caps, 0, sizeof(caps));
 898         memset(&fbcaps, 0, sizeof(fbcaps));
 899         caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0;
 900         event.info = info;
 901         event.data = &caps;
 902         fb_notifier_call_chain(FB_EVENT_GET_REQ, &event);
 903         info->fbops->fb_get_caps(info, &fbcaps, var);
 904
 905         if (((fbcaps.x ^ caps.x) & caps.x) ||
 906             ((fbcaps.y ^ caps.y) & caps.y) ||
 907             (fbcaps.len < caps.len))
 908                 err = -EINVAL;
 909
 910         return err;
 911 }
 912
 913 int
 914 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
 915 {
 916         int flags = info->flags;
 917         int ret = 0;
 918
 919         if (var->activate & FB_ACTIVATE_INV_MODE) {
 920                 struct fb_videomode mode1, mode2;
 921
 922                 fb_var_to_videomode(&mode1, var);
 923                 fb_var_to_videomode(&mode2, &info->var);
 924                 /* make sure we don't delete the videomode of current var */
 925                 ret = fb_mode_is_equal(&mode1, &mode2);
 926
 927                 if (!ret) {
 928                     struct fb_event event;
 929
 930                     event.info = info;
 931                     event.data = &mode1;
 932                     ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event);
 933                 }
 934
 935                 if (!ret)
 936                     fb_delete_videomode(&mode1, &info->modelist);
 937
 938
 939                 ret = (ret) ? -EINVAL : 0;
 940                 goto done;
 941         }
 942
 943         if ((var->activate & FB_ACTIVATE_FORCE) ||
 944             memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
 945                 u32 activate = var->activate;
 946
 947                 if (!info->fbops->fb_check_var) {
 948                         *var = info->var;
 949                         goto done;
 950                 }
 951
 952                 ret = info->fbops->fb_check_var(var, info);
 953
 954                 if (ret)
 955                         goto done;
 956
 957                 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
 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                         info->var = *var;
 968
 969                         if (info->fbops->fb_set_par)
 970                                 info->fbops->fb_set_par(info);
 971
 972                         fb_pan_display(info, &info->var);
 973                         fb_set_cmap(&info->cmap, info);
 974                         fb_var_to_videomode(&mode, &info->var);
 975
 976                         if (info->modelist.prev && info->modelist.next &&
 977                             !list_empty(&info->modelist))
 978                                 ret = fb_add_videomode(&mode, &info->modelist);
 979
 980                         if (!ret && (flags & FBINFO_MISC_USEREVENT)) {
 981                                 struct fb_event event;
 982                                 int evnt = (activate & FB_ACTIVATE_ALL) ?
 983                                         FB_EVENT_MODE_CHANGE_ALL :
 984                                         FB_EVENT_MODE_CHANGE;
 985
 986                                 info->flags &= ~FBINFO_MISC_USEREVENT;
 987                                 event.info = info;
 988                                 event.data = &mode;
 989                                 fb_notifier_call_chain(evnt, &event);
 990                         }
 991                 }
 992         }
 993
 994  done:
 995         return ret;
 996 }
 997
 998 int
 999 fb_blank(struct fb_info *info, int blank)
1000 {
1001         int ret = -EINVAL;
1002
1003         if (blank > FB_BLANK_POWERDOWN)
1004                 blank = FB_BLANK_POWERDOWN;
1005
1006         if (info->fbops->fb_blank)
1007                 ret = info->fbops->fb_blank(blank, info);
1008
1009         if (!ret) {
1010                 struct fb_event event;
1011
1012                 event.info = info;
1013                 event.data = &blank;
1014                 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
1015         }
1016
1017         return ret;
1018 }
1019
1020 static long do_fb_ioctl(struct fb_info *info, unsigned int cmd,
1021                         unsigned long arg)
1022 {
1023         struct fb_ops *fb;
1024         struct fb_var_screeninfo var;
1025         struct fb_fix_screeninfo fix;
1026         struct fb_con2fbmap con2fb;
1027         struct fb_cmap cmap_from;
1028         struct fb_cmap_user cmap;
1029         struct fb_event event;
1030         void __user *argp = (void __user *)arg;
1031         long ret = 0;
1032
1033         switch (cmd) {
1034         case FBIOGET_VSCREENINFO:
1035                 if (!lock_fb_info(info))
1036                         return -ENODEV;
1037                 var = info->var;
1038                 unlock_fb_info(info);
1039
1040                 ret = copy_to_user(argp, &var, sizeof(var)) ? -EFAULT : 0;
1041                 break;
1042         case FBIOPUT_VSCREENINFO:
1043                 if (copy_from_user(&var, argp, sizeof(var)))
1044                         return -EFAULT;
1045                 if (!lock_fb_info(info))
1046                         return -ENODEV;
1047                 acquire_console_sem();
1048                 info->flags |= FBINFO_MISC_USEREVENT;
1049                 ret = fb_set_var(info, &var);
1050                 info->flags &= ~FBINFO_MISC_USEREVENT;
1051                 release_console_sem();
1052                 unlock_fb_info(info);
1053                 if (!ret && copy_to_user(argp, &var, sizeof(var)))
1054                         ret = -EFAULT;
1055                 break;
1056         case FBIOGET_FSCREENINFO:
1057                 if (!lock_fb_info(info))
1058                         return -ENODEV;
1059                 fix = info->fix;
1060                 unlock_fb_info(info);
1061
1062                 ret = copy_to_user(argp, &fix, sizeof(fix)) ? -EFAULT : 0;
1063                 break;
1064         case FBIOPUTCMAP:
1065                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1066                         return -EFAULT;
1067                 ret = fb_set_user_cmap(&cmap, info);
1068                 break;
1069         case FBIOGETCMAP:
1070                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1071                         return -EFAULT;
1072                 if (!lock_fb_info(info))
1073                         return -ENODEV;
1074                 cmap_from = info->cmap;
1075                 unlock_fb_info(info);
1076                 ret = fb_cmap_to_user(&cmap_from, &cmap);
1077                 break;
1078         case FBIOPAN_DISPLAY:
1079                 if (copy_from_user(&var, argp, sizeof(var)))
1080                         return -EFAULT;
1081                 if (!lock_fb_info(info))
1082                         return -ENODEV;
1083                 acquire_console_sem();
1084                 ret = fb_pan_display(info, &var);
1085                 release_console_sem();
1086                 unlock_fb_info(info);
1087                 if (ret == 0 && copy_to_user(argp, &var, sizeof(var)))
1088                         return -EFAULT;
1089                 break;
1090         case FBIO_CURSOR:
1091                 ret = -EINVAL;
1092                 break;
1093         case FBIOGET_CON2FBMAP:
1094                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1095                         return -EFAULT;
1096                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1097                         return -EINVAL;
1098                 con2fb.framebuffer = -1;
1099                 event.data = &con2fb;
1100                 event.info = info;
1101                 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
1102                 ret = copy_to_user(argp, &con2fb, sizeof(con2fb)) ? -EFAULT : 0;
1103                 break;
1104         case FBIOPUT_CON2FBMAP:
1105                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1106                         return -EFAULT;
1107                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1108                         return -EINVAL;
1109                 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
1110                         return -EINVAL;
1111                 if (!registered_fb[con2fb.framebuffer])
1112                         request_module("fb%d", con2fb.framebuffer);
1113                 if (!registered_fb[con2fb.framebuffer]) {
1114                         ret = -EINVAL;
1115                         break;
1116                 }
1117                 event.data = &con2fb;
1118                 event.info = info;
1119                 ret = fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP, &event);
1120                 break;
1121         case FBIOBLANK:
1122                 if (!lock_fb_info(info))
1123                         return -ENODEV;
1124                 acquire_console_sem();
1125                 info->flags |= FBINFO_MISC_USEREVENT;
1126                 ret = fb_blank(info, arg);
1127                 info->flags &= ~FBINFO_MISC_USEREVENT;
1128                 release_console_sem();
1129                 unlock_fb_info(info);
1130                 break;
1131         default:
1132                 if (!lock_fb_info(info))
1133                         return -ENODEV;
1134                 fb = info->fbops;
1135                 if (fb->fb_ioctl)
1136                         ret = fb->fb_ioctl(info, cmd, arg);
1137                 else
1138                         ret = -ENOTTY;
1139                 unlock_fb_info(info);
1140         }
1141         return ret;
1142 }
1143
1144 static long fb_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1145 {
1146         struct inode *inode = file->f_path.dentry->d_inode;
1147         int fbidx = iminor(inode);
1148         struct fb_info *info = registered_fb[fbidx];
1149
1150         return do_fb_ioctl(info, cmd, arg);
1151 }
1152
1153 #ifdef CONFIG_COMPAT
1154 struct fb_fix_screeninfo32 {
1155         char                    id[16];
1156         compat_caddr_t          smem_start;
1157         u32                     smem_len;
1158         u32                     type;
1159         u32                     type_aux;
1160         u32                     visual;
1161         u16                     xpanstep;
1162         u16                     ypanstep;
1163         u16                     ywrapstep;
1164         u32                     line_length;
1165         compat_caddr_t          mmio_start;
1166         u32                     mmio_len;
1167         u32                     accel;
1168         u16                     reserved[3];
1169 };
1170
1171 struct fb_cmap32 {
1172         u32                     start;
1173         u32                     len;
1174         compat_caddr_t  red;
1175         compat_caddr_t  green;
1176         compat_caddr_t  blue;
1177         compat_caddr_t  transp;
1178 };
1179
1180 static int fb_getput_cmap(struct fb_info *info, unsigned int cmd,
1181                           unsigned long arg)
1182 {
1183         struct fb_cmap_user __user *cmap;
1184         struct fb_cmap32 __user *cmap32;
1185         __u32 data;
1186         int err;
1187
1188         cmap = compat_alloc_user_space(sizeof(*cmap));
1189         cmap32 = compat_ptr(arg);
1190
1191         if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1192                 return -EFAULT;
1193
1194         if (get_user(data, &cmap32->red) ||
1195             put_user(compat_ptr(data), &cmap->red) ||
1196             get_user(data, &cmap32->green) ||
1197             put_user(compat_ptr(data), &cmap->green) ||
1198             get_user(data, &cmap32->blue) ||
1199             put_user(compat_ptr(data), &cmap->blue) ||
1200             get_user(data, &cmap32->transp) ||
1201             put_user(compat_ptr(data), &cmap->transp))
1202                 return -EFAULT;
1203
1204         err = do_fb_ioctl(info, cmd, (unsigned long) cmap);
1205
1206         if (!err) {
1207                 if (copy_in_user(&cmap32->start,
1208                                  &cmap->start,
1209                                  2 * sizeof(__u32)))
1210                         err = -EFAULT;
1211         }
1212         return err;
1213 }
1214
1215 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1216                                   struct fb_fix_screeninfo32 __user *fix32)
1217 {
1218         __u32 data;
1219         int err;
1220
1221         err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1222
1223         data = (__u32) (unsigned long) fix->smem_start;
1224         err |= put_user(data, &fix32->smem_start);
1225
1226         err |= put_user(fix->smem_len, &fix32->smem_len);
1227         err |= put_user(fix->type, &fix32->type);
1228         err |= put_user(fix->type_aux, &fix32->type_aux);
1229         err |= put_user(fix->visual, &fix32->visual);
1230         err |= put_user(fix->xpanstep, &fix32->xpanstep);
1231         err |= put_user(fix->ypanstep, &fix32->ypanstep);
1232         err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1233         err |= put_user(fix->line_length, &fix32->line_length);
1234
1235         data = (__u32) (unsigned long) fix->mmio_start;
1236         err |= put_user(data, &fix32->mmio_start);
1237
1238         err |= put_user(fix->mmio_len, &fix32->mmio_len);
1239         err |= put_user(fix->accel, &fix32->accel);
1240         err |= copy_to_user(fix32->reserved, fix->reserved,
1241                             sizeof(fix->reserved));
1242
1243         return err;
1244 }
1245
1246 static int fb_get_fscreeninfo(struct fb_info *info, unsigned int cmd,
1247                               unsigned long arg)
1248 {
1249         mm_segment_t old_fs;
1250         struct fb_fix_screeninfo fix;
1251         struct fb_fix_screeninfo32 __user *fix32;
1252         int err;
1253
1254         fix32 = compat_ptr(arg);
1255
1256         old_fs = get_fs();
1257         set_fs(KERNEL_DS);
1258         err = do_fb_ioctl(info, cmd, (unsigned long) &fix);
1259         set_fs(old_fs);
1260
1261         if (!err)
1262                 err = do_fscreeninfo_to_user(&fix, fix32);
1263
1264         return err;
1265 }
1266
1267 static long fb_compat_ioctl(struct file *file, unsigned int cmd,
1268                             unsigned long arg)
1269 {
1270         struct inode *inode = file->f_path.dentry->d_inode;
1271         int fbidx = iminor(inode);
1272         struct fb_info *info = registered_fb[fbidx];
1273         struct fb_ops *fb = info->fbops;
1274         long ret = -ENOIOCTLCMD;
1275
1276         switch(cmd) {
1277         case FBIOGET_VSCREENINFO:
1278         case FBIOPUT_VSCREENINFO:
1279         case FBIOPAN_DISPLAY:
1280         case FBIOGET_CON2FBMAP:
1281         case FBIOPUT_CON2FBMAP:
1282                 arg = (unsigned long) compat_ptr(arg);
1283         case FBIOBLANK:
1284                 ret = do_fb_ioctl(info, cmd, arg);
1285                 break;
1286
1287         case FBIOGET_FSCREENINFO:
1288                 ret = fb_get_fscreeninfo(info, cmd, arg);
1289                 break;
1290
1291         case FBIOGETCMAP:
1292         case FBIOPUTCMAP:
1293                 ret = fb_getput_cmap(info, cmd, arg);
1294                 break;
1295
1296         default:
1297                 if (fb->fb_compat_ioctl)
1298                         ret = fb->fb_compat_ioctl(info, cmd, arg);
1299                 break;
1300         }
1301         return ret;
1302 }
1303 #endif
1304
1305 static int
1306 fb_mmap(struct file *file, struct vm_area_struct * vma)
1307 __acquires(&info->lock)
1308 __releases(&info->lock)
1309 {
1310         int fbidx = iminor(file->f_path.dentry->d_inode);
1311         struct fb_info *info = registered_fb[fbidx];
1312         struct fb_ops *fb = info->fbops;
1313         unsigned long off;
1314         unsigned long start;
1315         u32 len;
1316
1317         if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
1318                 return -EINVAL;
1319         off = vma->vm_pgoff << PAGE_SHIFT;
1320         if (!fb)
1321                 return -ENODEV;
1322         if (fb->fb_mmap) {
1323                 int res;
1324                 mutex_lock(&info->lock);
1325                 res = fb->fb_mmap(info, vma);
1326                 mutex_unlock(&info->lock);
1327                 return res;
1328         }
1329
1330         mutex_lock(&info->lock);
1331
1332         /* frame buffer memory */
1333         start = info->fix.smem_start;
1334         len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
1335         if (off >= len) {
1336                 /* memory mapped io */
1337                 off -= len;
1338                 if (info->var.accel_flags) {
1339                         mutex_unlock(&info->lock);
1340                         return -EINVAL;
1341                 }
1342                 start = info->fix.mmio_start;
1343                 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
1344         }
1345         mutex_unlock(&info->lock);
1346         start &= PAGE_MASK;
1347         if ((vma->vm_end - vma->vm_start + off) > len)
1348                 return -EINVAL;
1349         off += start;
1350         vma->vm_pgoff = off >> PAGE_SHIFT;
1351         /* This is an IO map - tell maydump to skip this VMA */
1352         vma->vm_flags |= VM_IO | VM_RESERVED;
1353         fb_pgprotect(file, vma, off);
1354         if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1355                              vma->vm_end - vma->vm_start, vma->vm_page_prot))
1356                 return -EAGAIN;
1357         return 0;
1358 }
1359
1360 static int
1361 fb_open(struct inode *inode, struct file *file)
1362 __acquires(&info->lock)
1363 __releases(&info->lock)
1364 {
1365         int fbidx = iminor(inode);
1366         struct fb_info *info;
1367         int res = 0;
1368
1369         if (fbidx >= FB_MAX)
1370                 return -ENODEV;
1371         info = registered_fb[fbidx];
1372         if (!info)
1373                 request_module("fb%d", fbidx);
1374         info = registered_fb[fbidx];
1375         if (!info)
1376                 return -ENODEV;
1377         mutex_lock(&info->lock);
1378         if (!try_module_get(info->fbops->owner)) {
1379                 res = -ENODEV;
1380                 goto out;
1381         }
1382         file->private_data = info;
1383         if (info->fbops->fb_open) {
1384                 res = info->fbops->fb_open(info,1);
1385                 if (res)
1386                         module_put(info->fbops->owner);
1387         }
1388 #ifdef CONFIG_FB_DEFERRED_IO
1389         if (info->fbdefio)
1390                 fb_deferred_io_open(info, inode, file);
1391 #endif
1392 out:
1393         mutex_unlock(&info->lock);
1394         return res;
1395 }
1396
1397 static int
1398 fb_release(struct inode *inode, struct file *file)
1399 __acquires(&info->lock)
1400 __releases(&info->lock)
1401 {
1402         struct fb_info * const info = file->private_data;
1403
1404         mutex_lock(&info->lock);
1405         if (info->fbops->fb_release)
1406                 info->fbops->fb_release(info,1);
1407         module_put(info->fbops->owner);
1408         mutex_unlock(&info->lock);
1409         return 0;
1410 }
1411
1412 static const struct file_operations fb_fops = {
1413         .owner =        THIS_MODULE,
1414         .read =         fb_read,
1415         .write =        fb_write,
1416         .unlocked_ioctl = fb_ioctl,
1417 #ifdef CONFIG_COMPAT
1418         .compat_ioctl = fb_compat_ioctl,
1419 #endif
1420         .mmap =         fb_mmap,
1421         .open =         fb_open,
1422         .release =      fb_release,
1423 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1424         .get_unmapped_area = get_fb_unmapped_area,
1425 #endif
1426 #ifdef CONFIG_FB_DEFERRED_IO
1427         .fsync =        fb_deferred_io_fsync,
1428 #endif
1429 };
1430
1431 struct class *fb_class;
1432 EXPORT_SYMBOL(fb_class);
1433
1434 static int fb_check_foreignness(struct fb_info *fi)
1435 {
1436         const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN;
1437
1438         fi->flags &= ~FBINFO_FOREIGN_ENDIAN;
1439
1440 #ifdef __BIG_ENDIAN
1441         fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH;
1442 #else
1443         fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0;
1444 #endif /* __BIG_ENDIAN */
1445
1446         if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) {
1447                 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to "
1448                        "support this framebuffer\n", fi->fix.id);
1449                 return -ENOSYS;
1450         } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) {
1451                 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to "
1452                        "support this framebuffer\n", fi->fix.id);
1453                 return -ENOSYS;
1454         }
1455
1456         return 0;
1457 }
1458
1459 /**
1460  *      register_framebuffer - registers a frame buffer device
1461  *      @fb_info: frame buffer info structure
1462  *
1463  *      Registers a frame buffer device @fb_info.
1464  *
1465  *      Returns negative errno on error, or zero for success.
1466  *
1467  */
1468
1469 int
1470 register_framebuffer(struct fb_info *fb_info)
1471 {
1472         int i;
1473         struct fb_event event;
1474         struct fb_videomode mode;
1475
1476         if (num_registered_fb == FB_MAX)
1477                 return -ENXIO;
1478
1479         if (fb_check_foreignness(fb_info))
1480                 return -ENOSYS;
1481
1482         num_registered_fb++;
1483         for (i = 0 ; i < FB_MAX; i++)
1484                 if (!registered_fb[i])
1485                         break;
1486         fb_info->node = i;
1487         mutex_init(&fb_info->lock);
1488
1489         fb_info->dev = device_create(fb_class, fb_info->device,
1490                                      MKDEV(FB_MAJOR, i), NULL, "fb%d", i);
1491         if (IS_ERR(fb_info->dev)) {
1492                 /* Not fatal */
1493                 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1494                 fb_info->dev = NULL;
1495         } else
1496                 fb_init_device(fb_info);
1497
1498         if (fb_info->pixmap.addr == NULL) {
1499                 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1500                 if (fb_info->pixmap.addr) {
1501                         fb_info->pixmap.size = FBPIXMAPSIZE;
1502                         fb_info->pixmap.buf_align = 1;
1503                         fb_info->pixmap.scan_align = 1;
1504                         fb_info->pixmap.access_align = 32;
1505                         fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1506                 }
1507         }
1508         fb_info->pixmap.offset = 0;
1509
1510         if (!fb_info->pixmap.blit_x)
1511                 fb_info->pixmap.blit_x = ~(u32)0;
1512
1513         if (!fb_info->pixmap.blit_y)
1514                 fb_info->pixmap.blit_y = ~(u32)0;
1515
1516         if (!fb_info->modelist.prev || !fb_info->modelist.next)
1517                 INIT_LIST_HEAD(&fb_info->modelist);
1518
1519         fb_var_to_videomode(&mode, &fb_info->var);
1520         fb_add_videomode(&mode, &fb_info->modelist);
1521         registered_fb[i] = fb_info;
1522
1523         event.info = fb_info;
1524         fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1525         return 0;
1526 }
1527
1528
1529 /**
1530  *      unregister_framebuffer - releases a frame buffer device
1531  *      @fb_info: frame buffer info structure
1532  *
1533  *      Unregisters a frame buffer device @fb_info.
1534  *
1535  *      Returns negative errno on error, or zero for success.
1536  *
1537  *      This function will also notify the framebuffer console
1538  *      to release the driver.
1539  *
1540  *      This is meant to be called within a driver's module_exit()
1541  *      function. If this is called outside module_exit(), ensure
1542  *      that the driver implements fb_open() and fb_release() to
1543  *      check that no processes are using the device.
1544  */
1545
1546 int
1547 unregister_framebuffer(struct fb_info *fb_info)
1548 {
1549         struct fb_event event;
1550         int i, ret = 0;
1551
1552         i = fb_info->node;
1553         if (!registered_fb[i]) {
1554                 ret = -EINVAL;
1555                 goto done;
1556         }
1557
1558         event.info = fb_info;
1559         ret = fb_notifier_call_chain(FB_EVENT_FB_UNBIND, &event);
1560
1561         if (ret) {
1562                 ret = -EINVAL;
1563                 goto done;
1564         }
1565
1566         if (fb_info->pixmap.addr &&
1567             (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1568                 kfree(fb_info->pixmap.addr);
1569         fb_destroy_modelist(&fb_info->modelist);
1570         registered_fb[i]=NULL;
1571         num_registered_fb--;
1572         fb_cleanup_device(fb_info);
1573         device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1574         event.info = fb_info;
1575         fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1576 done:
1577         return ret;
1578 }
1579
1580 /**
1581  *      fb_set_suspend - low level driver signals suspend
1582  *      @info: framebuffer affected
1583  *      @state: 0 = resuming, !=0 = suspending
1584  *
1585  *      This is meant to be used by low level drivers to
1586  *      signal suspend/resume to the core & clients.
1587  *      It must be called with the console semaphore held
1588  */
1589 void fb_set_suspend(struct fb_info *info, int state)
1590 {
1591         struct fb_event event;
1592
1593         event.info = info;
1594         if (state) {
1595                 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event);
1596                 info->state = FBINFO_STATE_SUSPENDED;
1597         } else {
1598                 info->state = FBINFO_STATE_RUNNING;
1599                 fb_notifier_call_chain(FB_EVENT_RESUME, &event);
1600         }
1601 }
1602
1603 /**
1604  *      fbmem_init - init frame buffer subsystem
1605  *
1606  *      Initialize the frame buffer subsystem.
1607  *
1608  *      NOTE: This function is _only_ to be called by drivers/char/mem.c.
1609  *
1610  */
1611
1612 static int __init
1613 fbmem_init(void)
1614 {
1615         proc_create("fb", 0, NULL, &fb_proc_fops);
1616
1617         if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1618                 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1619
1620         fb_class = class_create(THIS_MODULE, "graphics");
1621         if (IS_ERR(fb_class)) {
1622                 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1623                 fb_class = NULL;
1624         }
1625         return 0;
1626 }
1627
1628 #ifdef MODULE
1629 module_init(fbmem_init);
1630 static void __exit
1631 fbmem_exit(void)
1632 {
1633         remove_proc_entry("fb", NULL);
1634         class_destroy(fb_class);
1635         unregister_chrdev(FB_MAJOR, "fb");
1636 }
1637
1638 module_exit(fbmem_exit);
1639 MODULE_LICENSE("GPL");
1640 MODULE_DESCRIPTION("Framebuffer base");
1641 #else
1642 subsys_initcall(fbmem_init);
1643 #endif
1644
1645 int fb_new_modelist(struct fb_info *info)
1646 {
1647         struct fb_event event;
1648         struct fb_var_screeninfo var = info->var;
1649         struct list_head *pos, *n;
1650         struct fb_modelist *modelist;
1651         struct fb_videomode *m, mode;
1652         int err = 1;
1653
1654         list_for_each_safe(pos, n, &info->modelist) {
1655                 modelist = list_entry(pos, struct fb_modelist, list);
1656                 m = &modelist->mode;
1657                 fb_videomode_to_var(&var, m);
1658                 var.activate = FB_ACTIVATE_TEST;
1659                 err = fb_set_var(info, &var);
1660                 fb_var_to_videomode(&mode, &var);
1661                 if (err || !fb_mode_is_equal(m, &mode)) {
1662                         list_del(pos);
1663                         kfree(pos);
1664                 }
1665         }
1666
1667         err = 1;
1668
1669         if (!list_empty(&info->modelist)) {
1670                 event.info = info;
1671                 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
1672         }
1673
1674         return err;
1675 }
1676
1677 static char *video_options[FB_MAX] __read_mostly;
1678 static int ofonly __read_mostly;
1679
1680 /**
1681  * fb_get_options - get kernel boot parameters
1682  * @name:   framebuffer name as it would appear in
1683  *          the boot parameter line
1684  *          (video=<name>:<options>)
1685  * @option: the option will be stored here
1686  *
1687  * NOTE: Needed to maintain backwards compatibility
1688  */
1689 int fb_get_options(char *name, char **option)
1690 {
1691         char *opt, *options = NULL;
1692         int opt_len, retval = 0;
1693         int name_len = strlen(name), i;
1694
1695         if (name_len && ofonly && strncmp(name, "offb", 4))
1696                 retval = 1;
1697
1698         if (name_len && !retval) {
1699                 for (i = 0; i < FB_MAX; i++) {
1700                         if (video_options[i] == NULL)
1701                                 continue;
1702                         opt_len = strlen(video_options[i]);
1703                         if (!opt_len)
1704                                 continue;
1705                         opt = video_options[i];
1706                         if (!strncmp(name, opt, name_len) &&
1707                             opt[name_len] == ':')
1708                                 options = opt + name_len + 1;
1709                 }
1710         }
1711         if (options && !strncmp(options, "off", 3))
1712                 retval = 1;
1713
1714         if (option)
1715                 *option = options;
1716
1717         return retval;
1718 }
1719
1720 #ifndef MODULE
1721 /**
1722  *      video_setup - process command line options
1723  *      @options: string of options
1724  *
1725  *      Process command line options for frame buffer subsystem.
1726  *
1727  *      NOTE: This function is a __setup and __init function.
1728  *            It only stores the options.  Drivers have to call
1729  *            fb_get_options() as necessary.
1730  *
1731  *      Returns zero.
1732  *
1733  */
1734 static int __init video_setup(char *options)
1735 {
1736         int i, global = 0;
1737
1738         if (!options || !*options)
1739                 global = 1;
1740
1741         if (!global && !strncmp(options, "ofonly", 6)) {
1742                 ofonly = 1;
1743                 global = 1;
1744         }
1745
1746         if (!global && !strstr(options, "fb:")) {
1747                 fb_mode_option = options;
1748                 global = 1;
1749         }
1750
1751         if (!global) {
1752                 for (i = 0; i < FB_MAX; i++) {
1753                         if (video_options[i] == NULL) {
1754                                 video_options[i] = options;
1755                                 break;
1756                         }
1757
1758                 }
1759         }
1760
1761         return 1;
1762 }
1763 __setup("video=", video_setup);
1764 #endif
1765
1766     /*
1767      *  Visible symbols for modules
1768      */
1769
1770 EXPORT_SYMBOL(register_framebuffer);
1771 EXPORT_SYMBOL(unregister_framebuffer);
1772 EXPORT_SYMBOL(num_registered_fb);
1773 EXPORT_SYMBOL(registered_fb);
1774 EXPORT_SYMBOL(fb_show_logo);
1775 EXPORT_SYMBOL(fb_set_var);
1776 EXPORT_SYMBOL(fb_blank);
1777 EXPORT_SYMBOL(fb_pan_display);
1778 EXPORT_SYMBOL(fb_get_buffer_offset);
1779 EXPORT_SYMBOL(fb_set_suspend);
1780 EXPORT_SYMBOL(fb_get_options);
1781
1782 MODULE_LICENSE("GPL");