drivers/video/fbdev/core/fbmem.c

   1 /*
   2  *  linux/drivers/video/fbmem.c
   3  *
   4  *  Copyright (C) 1994 Martin Schaller
   5  *
   6  *      2001 - Documented with DocBook
   7  *      - Brad Douglas <brad@neruo.com>
   8  *
   9  * This file is subject to the terms and conditions of the GNU General Public
  10  * License.  See the file COPYING in the main directory of this archive
  11  * for more details.
  12  */
  13
  14 #include <linux/module.h>
  15
  16 #include <linux/compat.h>
  17 #include <linux/types.h>
  18 #include <linux/errno.h>
  19 #include <linux/kernel.h>
  20 #include <linux/major.h>
  21 #include <linux/slab.h>
  22 #include <linux/mm.h>
  23 #include <linux/mman.h>
  24 #include <linux/vt.h>
  25 #include <linux/init.h>
  26 #include <linux/linux_logo.h>
  27 #include <linux/proc_fs.h>
  28 #include <linux/seq_file.h>
  29 #include <linux/console.h>
  30 #include <linux/kmod.h>
  31 #include <linux/err.h>
  32 #include <linux/device.h>
  33 #include <linux/efi.h>
  34 #include <linux/fb.h>
  35 #include <linux/fbcon.h>
  36
  37 #include <asm/fb.h>
  38
  39
  40     /*
  41      *  Frame buffer device initialization and setup routines
  42      */
  43
  44 #define FBPIXMAPSIZE    (1024 * 8)
  45
  46 static DEFINE_MUTEX(registration_lock);
  47
  48 struct fb_info *registered_fb[FB_MAX] __read_mostly;
  49 EXPORT_SYMBOL(registered_fb);
  50
  51 int num_registered_fb __read_mostly;
  52 EXPORT_SYMBOL(num_registered_fb);
  53
  54 static struct fb_info *get_fb_info(unsigned int idx)
  55 {
  56         struct fb_info *fb_info;
  57
  58         if (idx >= FB_MAX)
  59                 return ERR_PTR(-ENODEV);
  60
  61         mutex_lock(&registration_lock);
  62         fb_info = registered_fb[idx];
  63         if (fb_info)
  64                 atomic_inc(&fb_info->count);
  65         mutex_unlock(&registration_lock);
  66
  67         return fb_info;
  68 }
  69
  70 static void put_fb_info(struct fb_info *fb_info)
  71 {
  72         if (!atomic_dec_and_test(&fb_info->count))
  73                 return;
  74         if (fb_info->fbops->fb_destroy)
  75                 fb_info->fbops->fb_destroy(fb_info);
  76 }
  77
  78 int lock_fb_info(struct fb_info *info)
  79 {
  80         mutex_lock(&info->lock);
  81         if (!info->fbops) {
  82                 mutex_unlock(&info->lock);
  83                 return 0;
  84         }
  85         return 1;
  86 }
  87 EXPORT_SYMBOL(lock_fb_info);
  88
  89 /*
  90  * Helpers
  91  */
  92
  93 int fb_get_color_depth(struct fb_var_screeninfo *var,
  94                        struct fb_fix_screeninfo *fix)
  95 {
  96         int depth = 0;
  97
  98         if (fix->visual == FB_VISUAL_MONO01 ||
  99             fix->visual == FB_VISUAL_MONO10)
 100                 depth = 1;
 101         else {
 102                 if (var->green.length == var->blue.length &&
 103                     var->green.length == var->red.length &&
 104                     var->green.offset == var->blue.offset &&
 105                     var->green.offset == var->red.offset)
 106                         depth = var->green.length;
 107                 else
 108                         depth = var->green.length + var->red.length +
 109                                 var->blue.length;
 110         }
 111
 112         return depth;
 113 }
 114 EXPORT_SYMBOL(fb_get_color_depth);
 115
 116 /*
 117  * Data padding functions.
 118  */
 119 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
 120 {
 121         __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
 122 }
 123 EXPORT_SYMBOL(fb_pad_aligned_buffer);
 124
 125 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
 126                                 u32 shift_high, u32 shift_low, u32 mod)
 127 {
 128         u8 mask = (u8) (0xfff << shift_high), tmp;
 129         int i, j;
 130
 131         for (i = height; i--; ) {
 132                 for (j = 0; j < idx; j++) {
 133                         tmp = dst[j];
 134                         tmp &= mask;
 135                         tmp |= *src >> shift_low;
 136                         dst[j] = tmp;
 137                         tmp = *src << shift_high;
 138                         dst[j+1] = tmp;
 139                         src++;
 140                 }
 141                 tmp = dst[idx];
 142                 tmp &= mask;
 143                 tmp |= *src >> shift_low;
 144                 dst[idx] = tmp;
 145                 if (shift_high < mod) {
 146                         tmp = *src << shift_high;
 147                         dst[idx+1] = tmp;
 148                 }
 149                 src++;
 150                 dst += d_pitch;
 151         }
 152 }
 153 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
 154
 155 /*
 156  * we need to lock this section since fb_cursor
 157  * may use fb_imageblit()
 158  */
 159 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
 160 {
 161         u32 align = buf->buf_align - 1, offset;
 162         char *addr = buf->addr;
 163
 164         /* If IO mapped, we need to sync before access, no sharing of
 165          * the pixmap is done
 166          */
 167         if (buf->flags & FB_PIXMAP_IO) {
 168                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 169                         info->fbops->fb_sync(info);
 170                 return addr;
 171         }
 172
 173         /* See if we fit in the remaining pixmap space */
 174         offset = buf->offset + align;
 175         offset &= ~align;
 176         if (offset + size > buf->size) {
 177                 /* We do not fit. In order to be able to re-use the buffer,
 178                  * we must ensure no asynchronous DMA'ing or whatever operation
 179                  * is in progress, we sync for that.
 180                  */
 181                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 182                         info->fbops->fb_sync(info);
 183                 offset = 0;
 184         }
 185         buf->offset = offset + size;
 186         addr += offset;
 187
 188         return addr;
 189 }
 190 EXPORT_SYMBOL(fb_get_buffer_offset);
 191
 192 #ifdef CONFIG_LOGO
 193
 194 static inline unsigned safe_shift(unsigned d, int n)
 195 {
 196         return n < 0 ? d >> -n : d << n;
 197 }
 198
 199 static void fb_set_logocmap(struct fb_info *info,
 200                                    const struct linux_logo *logo)
 201 {
 202         struct fb_cmap palette_cmap;
 203         u16 palette_green[16];
 204         u16 palette_blue[16];
 205         u16 palette_red[16];
 206         int i, j, n;
 207         const unsigned char *clut = logo->clut;
 208
 209         palette_cmap.start = 0;
 210         palette_cmap.len = 16;
 211         palette_cmap.red = palette_red;
 212         palette_cmap.green = palette_green;
 213         palette_cmap.blue = palette_blue;
 214         palette_cmap.transp = NULL;
 215
 216         for (i = 0; i < logo->clutsize; i += n) {
 217                 n = logo->clutsize - i;
 218                 /* palette_cmap provides space for only 16 colors at once */
 219                 if (n > 16)
 220                         n = 16;
 221                 palette_cmap.start = 32 + i;
 222                 palette_cmap.len = n;
 223                 for (j = 0; j < n; ++j) {
 224                         palette_cmap.red[j] = clut[0] << 8 | clut[0];
 225                         palette_cmap.green[j] = clut[1] << 8 | clut[1];
 226                         palette_cmap.blue[j] = clut[2] << 8 | clut[2];
 227                         clut += 3;
 228                 }
 229                 fb_set_cmap(&palette_cmap, info);
 230         }
 231 }
 232
 233 static void  fb_set_logo_truepalette(struct fb_info *info,
 234                                             const struct linux_logo *logo,
 235                                             u32 *palette)
 236 {
 237         static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
 238         unsigned char redmask, greenmask, bluemask;
 239         int redshift, greenshift, blueshift;
 240         int i;
 241         const unsigned char *clut = logo->clut;
 242
 243         /*
 244          * We have to create a temporary palette since console palette is only
 245          * 16 colors long.
 246          */
 247         /* Bug: Doesn't obey msb_right ... (who needs that?) */
 248         redmask   = mask[info->var.red.length   < 8 ? info->var.red.length   : 8];
 249         greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
 250         bluemask  = mask[info->var.blue.length  < 8 ? info->var.blue.length  : 8];
 251         redshift   = info->var.red.offset   - (8 - info->var.red.length);
 252         greenshift = info->var.green.offset - (8 - info->var.green.length);
 253         blueshift  = info->var.blue.offset  - (8 - info->var.blue.length);
 254
 255         for ( i = 0; i < logo->clutsize; i++) {
 256                 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
 257                                  safe_shift((clut[1] & greenmask), greenshift) |
 258                                  safe_shift((clut[2] & bluemask), blueshift));
 259                 clut += 3;
 260         }
 261 }
 262
 263 static void fb_set_logo_directpalette(struct fb_info *info,
 264                                              const struct linux_logo *logo,
 265                                              u32 *palette)
 266 {
 267         int redshift, greenshift, blueshift;
 268         int i;
 269
 270         redshift = info->var.red.offset;
 271         greenshift = info->var.green.offset;
 272         blueshift = info->var.blue.offset;
 273
 274         for (i = 32; i < 32 + logo->clutsize; i++)
 275                 palette[i] = i << redshift | i << greenshift | i << blueshift;
 276 }
 277
 278 static void fb_set_logo(struct fb_info *info,
 279                                const struct linux_logo *logo, u8 *dst,
 280                                int depth)
 281 {
 282         int i, j, k;
 283         const u8 *src = logo->data;
 284         u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
 285         u8 fg = 1, d;
 286
 287         switch (fb_get_color_depth(&info->var, &info->fix)) {
 288         case 1:
 289                 fg = 1;
 290                 break;
 291         case 2:
 292                 fg = 3;
 293                 break;
 294         default:
 295                 fg = 7;
 296                 break;
 297         }
 298
 299         if (info->fix.visual == FB_VISUAL_MONO01 ||
 300             info->fix.visual == FB_VISUAL_MONO10)
 301                 fg = ~((u8) (0xfff << info->var.green.length));
 302
 303         switch (depth) {
 304         case 4:
 305                 for (i = 0; i < logo->height; i++)
 306                         for (j = 0; j < logo->width; src++) {
 307                                 *dst++ = *src >> 4;
 308                                 j++;
 309                                 if (j < logo->width) {
 310                                         *dst++ = *src & 0x0f;
 311                                         j++;
 312                                 }
 313                         }
 314                 break;
 315         case 1:
 316                 for (i = 0; i < logo->height; i++) {
 317                         for (j = 0; j < logo->width; src++) {
 318                                 d = *src ^ xor;
 319                                 for (k = 7; k >= 0 && j < logo->width; k--) {
 320                                         *dst++ = ((d >> k) & 1) ? fg : 0;
 321                                         j++;
 322                                 }
 323                         }
 324                 }
 325                 break;
 326         }
 327 }
 328
 329 /*
 330  * Three (3) kinds of logo maps exist.  linux_logo_clut224 (>16 colors),
 331  * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors).  Depending on
 332  * the visual format and color depth of the framebuffer, the DAC, the
 333  * pseudo_palette, and the logo data will be adjusted accordingly.
 334  *
 335  * Case 1 - linux_logo_clut224:
 336  * Color exceeds the number of console colors (16), thus we set the hardware DAC
 337  * using fb_set_cmap() appropriately.  The "needs_cmapreset"  flag will be set.
 338  *
 339  * For visuals that require color info from the pseudo_palette, we also construct
 340  * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
 341  * will be set.
 342  *
 343  * Case 2 - linux_logo_vga16:
 344  * The number of colors just matches the console colors, thus there is no need
 345  * to set the DAC or the pseudo_palette.  However, the bitmap is packed, ie,
 346  * each byte contains color information for two pixels (upper and lower nibble).
 347  * To be consistent with fb_imageblit() usage, we therefore separate the two
 348  * nibbles into separate bytes. The "depth" flag will be set to 4.
 349  *
 350  * Case 3 - linux_logo_mono:
 351  * This is similar with Case 2.  Each byte contains information for 8 pixels.
 352  * We isolate each bit and expand each into a byte. The "depth" flag will
 353  * be set to 1.
 354  */
 355 static struct logo_data {
 356         int depth;
 357         int needs_directpalette;
 358         int needs_truepalette;
 359         int needs_cmapreset;
 360         const struct linux_logo *logo;
 361 } fb_logo __read_mostly;
 362
 363 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
 364 {
 365         u32 size = width * height, i;
 366
 367         out += size - 1;
 368
 369         for (i = size; i--; )
 370                 *out-- = *in++;
 371 }
 372
 373 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
 374 {
 375         int i, j, h = height - 1;
 376
 377         for (i = 0; i < height; i++)
 378                 for (j = 0; j < width; j++)
 379                                 out[height * j + h - i] = *in++;
 380 }
 381
 382 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
 383 {
 384         int i, j, w = width - 1;
 385
 386         for (i = 0; i < height; i++)
 387                 for (j = 0; j < width; j++)
 388                         out[height * (w - j) + i] = *in++;
 389 }
 390
 391 static void fb_rotate_logo(struct fb_info *info, u8 *dst,
 392                            struct fb_image *image, int rotate)
 393 {
 394         u32 tmp;
 395
 396         if (rotate == FB_ROTATE_UD) {
 397                 fb_rotate_logo_ud(image->data, dst, image->width,
 398                                   image->height);
 399                 image->dx = info->var.xres - image->width - image->dx;
 400                 image->dy = info->var.yres - image->height - image->dy;
 401         } else if (rotate == FB_ROTATE_CW) {
 402                 fb_rotate_logo_cw(image->data, dst, image->width,
 403                                   image->height);
 404                 tmp = image->width;
 405                 image->width = image->height;
 406                 image->height = tmp;
 407                 tmp = image->dy;
 408                 image->dy = image->dx;
 409                 image->dx = info->var.xres - image->width - tmp;
 410         } else if (rotate == FB_ROTATE_CCW) {
 411                 fb_rotate_logo_ccw(image->data, dst, image->width,
 412                                    image->height);
 413                 tmp = image->width;
 414                 image->width = image->height;
 415                 image->height = tmp;
 416                 tmp = image->dx;
 417                 image->dx = image->dy;
 418                 image->dy = info->var.yres - image->height - tmp;
 419         }
 420
 421         image->data = dst;
 422 }
 423
 424 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
 425                             int rotate, unsigned int num)
 426 {
 427         unsigned int x;
 428
 429         if (rotate == FB_ROTATE_UR) {
 430                 for (x = 0;
 431                      x < num && image->dx + image->width <= info->var.xres;
 432                      x++) {
 433                         info->fbops->fb_imageblit(info, image);
 434                         image->dx += image->width + 8;
 435                 }
 436         } else if (rotate == FB_ROTATE_UD) {
 437                 for (x = 0; x < num; x++) {
 438                         info->fbops->fb_imageblit(info, image);
 439                         image->dx -= image->width + 8;
 440                 }
 441         } else if (rotate == FB_ROTATE_CW) {
 442                 for (x = 0;
 443                      x < num && image->dy + image->height <= info->var.yres;
 444                      x++) {
 445                         info->fbops->fb_imageblit(info, image);
 446                         image->dy += image->height + 8;
 447                 }
 448         } else if (rotate == FB_ROTATE_CCW) {
 449                 for (x = 0; x < num; x++) {
 450                         info->fbops->fb_imageblit(info, image);
 451                         image->dy -= image->height + 8;
 452                 }
 453         }
 454 }
 455
 456 static int fb_show_logo_line(struct fb_info *info, int rotate,
 457                              const struct linux_logo *logo, int y,
 458                              unsigned int n)
 459 {
 460         u32 *palette = NULL, *saved_pseudo_palette = NULL;
 461         unsigned char *logo_new = NULL, *logo_rotate = NULL;
 462         struct fb_image image;
 463
 464         /* Return if the frame buffer is not mapped or suspended */
 465         if (logo == NULL || info->state != FBINFO_STATE_RUNNING ||
 466             info->fbops->owner)
 467                 return 0;
 468
 469         image.depth = 8;
 470         image.data = logo->data;
 471
 472         if (fb_logo.needs_cmapreset)
 473                 fb_set_logocmap(info, logo);
 474
 475         if (fb_logo.needs_truepalette ||
 476             fb_logo.needs_directpalette) {
 477                 palette = kmalloc(256 * 4, GFP_KERNEL);
 478                 if (palette == NULL)
 479                         return 0;
 480
 481                 if (fb_logo.needs_truepalette)
 482                         fb_set_logo_truepalette(info, logo, palette);
 483                 else
 484                         fb_set_logo_directpalette(info, logo, palette);
 485
 486                 saved_pseudo_palette = info->pseudo_palette;
 487                 info->pseudo_palette = palette;
 488         }
 489
 490         if (fb_logo.depth <= 4) {
 491                 logo_new = kmalloc(logo->width * logo->height, GFP_KERNEL);
 492                 if (logo_new == NULL) {
 493                         kfree(palette);
 494                         if (saved_pseudo_palette)
 495                                 info->pseudo_palette = saved_pseudo_palette;
 496                         return 0;
 497                 }
 498                 image.data = logo_new;
 499                 fb_set_logo(info, logo, logo_new, fb_logo.depth);
 500         }
 501
 502         image.dx = 0;
 503         image.dy = y;
 504         image.width = logo->width;
 505         image.height = logo->height;
 506
 507         if (rotate) {
 508                 logo_rotate = kmalloc(logo->width *
 509                                       logo->height, GFP_KERNEL);
 510                 if (logo_rotate)
 511                         fb_rotate_logo(info, logo_rotate, &image, rotate);
 512         }
 513
 514         fb_do_show_logo(info, &image, rotate, n);
 515
 516         kfree(palette);
 517         if (saved_pseudo_palette != NULL)
 518                 info->pseudo_palette = saved_pseudo_palette;
 519         kfree(logo_new);
 520         kfree(logo_rotate);
 521         return logo->height;
 522 }
 523
 524
 525 #ifdef CONFIG_FB_LOGO_EXTRA
 526
 527 #define FB_LOGO_EX_NUM_MAX 10
 528 static struct logo_data_extra {
 529         const struct linux_logo *logo;
 530         unsigned int n;
 531 } fb_logo_ex[FB_LOGO_EX_NUM_MAX];
 532 static unsigned int fb_logo_ex_num;
 533
 534 void fb_append_extra_logo(const struct linux_logo *logo, unsigned int n)
 535 {
 536         if (!n || fb_logo_ex_num == FB_LOGO_EX_NUM_MAX)
 537                 return;
 538
 539         fb_logo_ex[fb_logo_ex_num].logo = logo;
 540         fb_logo_ex[fb_logo_ex_num].n = n;
 541         fb_logo_ex_num++;
 542 }
 543
 544 static int fb_prepare_extra_logos(struct fb_info *info, unsigned int height,
 545                                   unsigned int yres)
 546 {
 547         unsigned int i;
 548
 549         /* FIXME: logo_ex supports only truecolor fb. */
 550         if (info->fix.visual != FB_VISUAL_TRUECOLOR)
 551                 fb_logo_ex_num = 0;
 552
 553         for (i = 0; i < fb_logo_ex_num; i++) {
 554                 if (fb_logo_ex[i].logo->type != fb_logo.logo->type) {
 555                         fb_logo_ex[i].logo = NULL;
 556                         continue;
 557                 }
 558                 height += fb_logo_ex[i].logo->height;
 559                 if (height > yres) {
 560                         height -= fb_logo_ex[i].logo->height;
 561                         fb_logo_ex_num = i;
 562                         break;
 563                 }
 564         }
 565         return height;
 566 }
 567
 568 static int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
 569 {
 570         unsigned int i;
 571
 572         for (i = 0; i < fb_logo_ex_num; i++)
 573                 y += fb_show_logo_line(info, rotate,
 574                                        fb_logo_ex[i].logo, y, fb_logo_ex[i].n);
 575
 576         return y;
 577 }
 578
 579 #else /* !CONFIG_FB_LOGO_EXTRA */
 580
 581 static inline int fb_prepare_extra_logos(struct fb_info *info,
 582                                          unsigned int height,
 583                                          unsigned int yres)
 584 {
 585         return height;
 586 }
 587
 588 static inline int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
 589 {
 590         return y;
 591 }
 592
 593 #endif /* CONFIG_FB_LOGO_EXTRA */
 594
 595
 596 int fb_prepare_logo(struct fb_info *info, int rotate)
 597 {
 598         int depth = fb_get_color_depth(&info->var, &info->fix);
 599         unsigned int yres;
 600
 601         memset(&fb_logo, 0, sizeof(struct logo_data));
 602
 603         if (info->flags & FBINFO_MISC_TILEBLITTING ||
 604             info->fbops->owner)
 605                 return 0;
 606
 607         if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
 608                 depth = info->var.blue.length;
 609                 if (info->var.red.length < depth)
 610                         depth = info->var.red.length;
 611                 if (info->var.green.length < depth)
 612                         depth = info->var.green.length;
 613         }
 614
 615         if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) {
 616                 /* assume console colormap */
 617                 depth = 4;
 618         }
 619
 620         /* Return if no suitable logo was found */
 621         fb_logo.logo = fb_find_logo(depth);
 622
 623         if (!fb_logo.logo) {
 624                 return 0;
 625         }
 626
 627         if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
 628                 yres = info->var.yres;
 629         else
 630                 yres = info->var.xres;
 631
 632         if (fb_logo.logo->height > yres) {
 633                 fb_logo.logo = NULL;
 634                 return 0;
 635         }
 636
 637         /* What depth we asked for might be different from what we get */
 638         if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
 639                 fb_logo.depth = 8;
 640         else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
 641                 fb_logo.depth = 4;
 642         else
 643                 fb_logo.depth = 1;
 644
 645
 646         if (fb_logo.depth > 4 && depth > 4) {
 647                 switch (info->fix.visual) {
 648                 case FB_VISUAL_TRUECOLOR:
 649                         fb_logo.needs_truepalette = 1;
 650                         break;
 651                 case FB_VISUAL_DIRECTCOLOR:
 652                         fb_logo.needs_directpalette = 1;
 653                         fb_logo.needs_cmapreset = 1;
 654                         break;
 655                 case FB_VISUAL_PSEUDOCOLOR:
 656                         fb_logo.needs_cmapreset = 1;
 657                         break;
 658                 }
 659         }
 660
 661         return fb_prepare_extra_logos(info, fb_logo.logo->height, yres);
 662 }
 663
 664 int fb_show_logo(struct fb_info *info, int rotate)
 665 {
 666         int y;
 667
 668         y = fb_show_logo_line(info, rotate, fb_logo.logo, 0,
 669                               num_online_cpus());
 670         y = fb_show_extra_logos(info, y, rotate);
 671
 672         return y;
 673 }
 674 #else
 675 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
 676 int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
 677 #endif /* CONFIG_LOGO */
 678 EXPORT_SYMBOL(fb_prepare_logo);
 679 EXPORT_SYMBOL(fb_show_logo);
 680
 681 static void *fb_seq_start(struct seq_file *m, loff_t *pos)
 682 {
 683         mutex_lock(&registration_lock);
 684         return (*pos < FB_MAX) ? pos : NULL;
 685 }
 686
 687 static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos)
 688 {
 689         (*pos)++;
 690         return (*pos < FB_MAX) ? pos : NULL;
 691 }
 692
 693 static void fb_seq_stop(struct seq_file *m, void *v)
 694 {
 695         mutex_unlock(&registration_lock);
 696 }
 697
 698 static int fb_seq_show(struct seq_file *m, void *v)
 699 {
 700         int i = *(loff_t *)v;
 701         struct fb_info *fi = registered_fb[i];
 702
 703         if (fi)
 704                 seq_printf(m, "%d %s\n", fi->node, fi->fix.id);
 705         return 0;
 706 }
 707
 708 static const struct seq_operations proc_fb_seq_ops = {
 709         .start  = fb_seq_start,
 710         .next   = fb_seq_next,
 711         .stop   = fb_seq_stop,
 712         .show   = fb_seq_show,
 713 };
 714
 715 static int proc_fb_open(struct inode *inode, struct file *file)
 716 {
 717         return seq_open(file, &proc_fb_seq_ops);
 718 }
 719
 720 static const struct file_operations fb_proc_fops = {
 721         .owner          = THIS_MODULE,
 722         .open           = proc_fb_open,
 723         .read           = seq_read,
 724         .llseek         = seq_lseek,
 725         .release        = seq_release,
 726 };
 727
 728 /*
 729  * We hold a reference to the fb_info in file->private_data,
 730  * but if the current registered fb has changed, we don't
 731  * actually want to use it.
 732  *
 733  * So look up the fb_info using the inode minor number,
 734  * and just verify it against the reference we have.
 735  */
 736 static struct fb_info *file_fb_info(struct file *file)
 737 {
 738         struct inode *inode = file_inode(file);
 739         int fbidx = iminor(inode);
 740         struct fb_info *info = registered_fb[fbidx];
 741
 742         if (info != file->private_data)
 743                 info = NULL;
 744         return info;
 745 }
 746
 747 static ssize_t
 748 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 749 {
 750         unsigned long p = *ppos;
 751         struct fb_info *info = file_fb_info(file);
 752         u8 *buffer, *dst;
 753         u8 __iomem *src;
 754         int c, cnt = 0, err = 0;
 755         unsigned long total_size;
 756
 757         if (!info || ! info->screen_base)
 758                 return -ENODEV;
 759
 760         if (info->state != FBINFO_STATE_RUNNING)
 761                 return -EPERM;
 762
 763         if (info->fbops->fb_read)
 764                 return info->fbops->fb_read(info, buf, count, ppos);
 765
 766         total_size = info->screen_size;
 767
 768         if (total_size == 0)
 769                 total_size = info->fix.smem_len;
 770
 771         if (p >= total_size)
 772                 return 0;
 773
 774         if (count >= total_size)
 775                 count = total_size;
 776
 777         if (count + p > total_size)
 778                 count = total_size - p;
 779
 780         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 781                          GFP_KERNEL);
 782         if (!buffer)
 783                 return -ENOMEM;
 784
 785         src = (u8 __iomem *) (info->screen_base + p);
 786
 787         if (info->fbops->fb_sync)
 788                 info->fbops->fb_sync(info);
 789
 790         while (count) {
 791                 c  = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 792                 dst = buffer;
 793                 fb_memcpy_fromfb(dst, src, c);
 794                 dst += c;
 795                 src += c;
 796
 797                 if (copy_to_user(buf, buffer, c)) {
 798                         err = -EFAULT;
 799                         break;
 800                 }
 801                 *ppos += c;
 802                 buf += c;
 803                 cnt += c;
 804                 count -= c;
 805         }
 806
 807         kfree(buffer);
 808
 809         return (err) ? err : cnt;
 810 }
 811
 812 static ssize_t
 813 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 814 {
 815         unsigned long p = *ppos;
 816         struct fb_info *info = file_fb_info(file);
 817         u8 *buffer, *src;
 818         u8 __iomem *dst;
 819         int c, cnt = 0, err = 0;
 820         unsigned long total_size;
 821
 822         if (!info || !info->screen_base)
 823                 return -ENODEV;
 824
 825         if (info->state != FBINFO_STATE_RUNNING)
 826                 return -EPERM;
 827
 828         if (info->fbops->fb_write)
 829                 return info->fbops->fb_write(info, buf, count, ppos);
 830
 831         total_size = info->screen_size;
 832
 833         if (total_size == 0)
 834                 total_size = info->fix.smem_len;
 835
 836         if (p > total_size)
 837                 return -EFBIG;
 838
 839         if (count > total_size) {
 840                 err = -EFBIG;
 841                 count = total_size;
 842         }
 843
 844         if (count + p > total_size) {
 845                 if (!err)
 846                         err = -ENOSPC;
 847
 848                 count = total_size - p;
 849         }
 850
 851         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 852                          GFP_KERNEL);
 853         if (!buffer)
 854                 return -ENOMEM;
 855
 856         dst = (u8 __iomem *) (info->screen_base + p);
 857
 858         if (info->fbops->fb_sync)
 859                 info->fbops->fb_sync(info);
 860
 861         while (count) {
 862                 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 863                 src = buffer;
 864
 865                 if (copy_from_user(src, buf, c)) {
 866                         err = -EFAULT;
 867                         break;
 868                 }
 869
 870                 fb_memcpy_tofb(dst, src, c);
 871                 dst += c;
 872                 src += c;
 873                 *ppos += c;
 874                 buf += c;
 875                 cnt += c;
 876                 count -= c;
 877         }
 878
 879         kfree(buffer);
 880
 881         return (cnt) ? cnt : err;
 882 }
 883
 884 int
 885 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
 886 {
 887         struct fb_fix_screeninfo *fix = &info->fix;
 888         unsigned int yres = info->var.yres;
 889         int err = 0;
 890
 891         if (var->yoffset > 0) {
 892                 if (var->vmode & FB_VMODE_YWRAP) {
 893                         if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
 894                                 err = -EINVAL;
 895                         else
 896                                 yres = 0;
 897                 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
 898                         err = -EINVAL;
 899         }
 900
 901         if (var->xoffset > 0 && (!fix->xpanstep ||
 902                                  (var->xoffset % fix->xpanstep)))
 903                 err = -EINVAL;
 904
 905         if (err || !info->fbops->fb_pan_display ||
 906             var->yoffset > info->var.yres_virtual - yres ||
 907             var->xoffset > info->var.xres_virtual - info->var.xres)
 908                 return -EINVAL;
 909
 910         if ((err = info->fbops->fb_pan_display(var, info)))
 911                 return err;
 912         info->var.xoffset = var->xoffset;
 913         info->var.yoffset = var->yoffset;
 914         if (var->vmode & FB_VMODE_YWRAP)
 915                 info->var.vmode |= FB_VMODE_YWRAP;
 916         else
 917                 info->var.vmode &= ~FB_VMODE_YWRAP;
 918         return 0;
 919 }
 920 EXPORT_SYMBOL(fb_pan_display);
 921
 922 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var,
 923                          u32 activate)
 924 {
 925         struct fb_event event;
 926         struct fb_blit_caps caps, fbcaps;
 927         int err = 0;
 928
 929         memset(&caps, 0, sizeof(caps));
 930         memset(&fbcaps, 0, sizeof(fbcaps));
 931         caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0;
 932         event.info = info;
 933         event.data = &caps;
 934         fb_notifier_call_chain(FB_EVENT_GET_REQ, &event);
 935         info->fbops->fb_get_caps(info, &fbcaps, var);
 936
 937         if (((fbcaps.x ^ caps.x) & caps.x) ||
 938             ((fbcaps.y ^ caps.y) & caps.y) ||
 939             (fbcaps.len < caps.len))
 940                 err = -EINVAL;
 941
 942         return err;
 943 }
 944
 945 int
 946 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
 947 {
 948         int flags = info->flags;
 949         int ret = 0;
 950
 951         if (var->activate & FB_ACTIVATE_INV_MODE) {
 952                 struct fb_videomode mode1, mode2;
 953
 954                 fb_var_to_videomode(&mode1, var);
 955                 fb_var_to_videomode(&mode2, &info->var);
 956                 /* make sure we don't delete the videomode of current var */
 957                 ret = fb_mode_is_equal(&mode1, &mode2);
 958
 959                 if (!ret) {
 960                     struct fb_event event;
 961
 962                     event.info = info;
 963                     event.data = &mode1;
 964                     ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event);
 965                 }
 966
 967                 if (!ret)
 968                     fb_delete_videomode(&mode1, &info->modelist);
 969
 970
 971                 ret = (ret) ? -EINVAL : 0;
 972                 goto done;
 973         }
 974
 975         if ((var->activate & FB_ACTIVATE_FORCE) ||
 976             memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
 977                 u32 activate = var->activate;
 978
 979                 /* When using FOURCC mode, make sure the red, green, blue and
 980                  * transp fields are set to 0.
 981                  */
 982                 if ((info->fix.capabilities & FB_CAP_FOURCC) &&
 983                     var->grayscale > 1) {
 984                         if (var->red.offset     || var->green.offset    ||
 985                             var->blue.offset    || var->transp.offset   ||
 986                             var->red.length     || var->green.length    ||
 987                             var->blue.length    || var->transp.length   ||
 988                             var->red.msb_right  || var->green.msb_right ||
 989                             var->blue.msb_right || var->transp.msb_right)
 990                                 return -EINVAL;
 991                 }
 992
 993                 if (!info->fbops->fb_check_var) {
 994                         *var = info->var;
 995                         goto done;
 996                 }
 997
 998                 ret = info->fbops->fb_check_var(var, info);
 999
1000                 if (ret)
1001                         goto done;
1002
1003                 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
1004                         struct fb_var_screeninfo old_var;
1005                         struct fb_videomode mode;
1006
1007                         if (info->fbops->fb_get_caps) {
1008                                 ret = fb_check_caps(info, var, activate);
1009
1010                                 if (ret)
1011                                         goto done;
1012                         }
1013
1014                         old_var = info->var;
1015                         info->var = *var;
1016
1017                         if (info->fbops->fb_set_par) {
1018                                 ret = info->fbops->fb_set_par(info);
1019
1020                                 if (ret) {
1021                                         info->var = old_var;
1022                                         printk(KERN_WARNING "detected "
1023                                                 "fb_set_par error, "
1024                                                 "error code: %d\n", ret);
1025                                         goto done;
1026                                 }
1027                         }
1028
1029                         fb_pan_display(info, &info->var);
1030                         fb_set_cmap(&info->cmap, info);
1031                         fb_var_to_videomode(&mode, &info->var);
1032
1033                         if (info->modelist.prev && info->modelist.next &&
1034                             !list_empty(&info->modelist))
1035                                 ret = fb_add_videomode(&mode, &info->modelist);
1036
1037                         if (!ret && (flags & FBINFO_MISC_USEREVENT)) {
1038                                 struct fb_event event;
1039                                 int evnt = (activate & FB_ACTIVATE_ALL) ?
1040                                         FB_EVENT_MODE_CHANGE_ALL :
1041                                         FB_EVENT_MODE_CHANGE;
1042
1043                                 info->flags &= ~FBINFO_MISC_USEREVENT;
1044                                 event.info = info;
1045                                 event.data = &mode;
1046                                 fb_notifier_call_chain(evnt, &event);
1047                         }
1048                 }
1049         }
1050
1051  done:
1052         return ret;
1053 }
1054 EXPORT_SYMBOL(fb_set_var);
1055
1056 int
1057 fb_blank(struct fb_info *info, int blank)
1058 {
1059         struct fb_event event;
1060         int ret = -EINVAL, early_ret;
1061
1062         if (blank > FB_BLANK_POWERDOWN)
1063                 blank = FB_BLANK_POWERDOWN;
1064
1065         event.info = info;
1066         event.data = &blank;
1067
1068         early_ret = fb_notifier_call_chain(FB_EARLY_EVENT_BLANK, &event);
1069
1070         if (info->fbops->fb_blank)
1071                 ret = info->fbops->fb_blank(blank, info);
1072
1073         if (!ret)
1074                 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
1075         else {
1076                 /*
1077                  * if fb_blank is failed then revert effects of
1078                  * the early blank event.
1079                  */
1080                 if (!early_ret)
1081                         fb_notifier_call_chain(FB_R_EARLY_EVENT_BLANK, &event);
1082         }
1083
1084         return ret;
1085 }
1086 EXPORT_SYMBOL(fb_blank);
1087
1088 static long do_fb_ioctl(struct fb_info *info, unsigned int cmd,
1089                         unsigned long arg)
1090 {
1091         struct fb_ops *fb;
1092         struct fb_var_screeninfo var;
1093         struct fb_fix_screeninfo fix;
1094         struct fb_con2fbmap con2fb;
1095         struct fb_cmap cmap_from;
1096         struct fb_cmap_user cmap;
1097         struct fb_event event;
1098         void __user *argp = (void __user *)arg;
1099         long ret = 0;
1100
1101         switch (cmd) {
1102         case FBIOGET_VSCREENINFO:
1103                 if (!lock_fb_info(info))
1104                         return -ENODEV;
1105                 var = info->var;
1106                 unlock_fb_info(info);
1107
1108                 ret = copy_to_user(argp, &var, sizeof(var)) ? -EFAULT : 0;
1109                 break;
1110         case FBIOPUT_VSCREENINFO:
1111                 if (copy_from_user(&var, argp, sizeof(var)))
1112                         return -EFAULT;
1113                 console_lock();
1114                 if (!lock_fb_info(info)) {
1115                         console_unlock();
1116                         return -ENODEV;
1117                 }
1118                 info->flags |= FBINFO_MISC_USEREVENT;
1119                 ret = fb_set_var(info, &var);
1120                 info->flags &= ~FBINFO_MISC_USEREVENT;
1121                 unlock_fb_info(info);
1122                 console_unlock();
1123                 if (!ret && copy_to_user(argp, &var, sizeof(var)))
1124                         ret = -EFAULT;
1125                 break;
1126         case FBIOGET_FSCREENINFO:
1127                 if (!lock_fb_info(info))
1128                         return -ENODEV;
1129                 fix = info->fix;
1130                 unlock_fb_info(info);
1131
1132                 ret = copy_to_user(argp, &fix, sizeof(fix)) ? -EFAULT : 0;
1133                 break;
1134         case FBIOPUTCMAP:
1135                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1136                         return -EFAULT;
1137                 ret = fb_set_user_cmap(&cmap, info);
1138                 break;
1139         case FBIOGETCMAP:
1140                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1141                         return -EFAULT;
1142                 if (!lock_fb_info(info))
1143                         return -ENODEV;
1144                 cmap_from = info->cmap;
1145                 unlock_fb_info(info);
1146                 ret = fb_cmap_to_user(&cmap_from, &cmap);
1147                 break;
1148         case FBIOPAN_DISPLAY:
1149                 if (copy_from_user(&var, argp, sizeof(var)))
1150                         return -EFAULT;
1151                 console_lock();
1152                 if (!lock_fb_info(info)) {
1153                         console_unlock();
1154                         return -ENODEV;
1155                 }
1156                 ret = fb_pan_display(info, &var);
1157                 unlock_fb_info(info);
1158                 console_unlock();
1159                 if (ret == 0 && copy_to_user(argp, &var, sizeof(var)))
1160                         return -EFAULT;
1161                 break;
1162         case FBIO_CURSOR:
1163                 ret = -EINVAL;
1164                 break;
1165         case FBIOGET_CON2FBMAP:
1166                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1167                         return -EFAULT;
1168                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1169                         return -EINVAL;
1170                 con2fb.framebuffer = -1;
1171                 event.data = &con2fb;
1172                 if (!lock_fb_info(info))
1173                         return -ENODEV;
1174                 event.info = info;
1175                 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
1176                 unlock_fb_info(info);
1177                 ret = copy_to_user(argp, &con2fb, sizeof(con2fb)) ? -EFAULT : 0;
1178                 break;
1179         case FBIOPUT_CON2FBMAP:
1180                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1181                         return -EFAULT;
1182                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1183                         return -EINVAL;
1184                 if (con2fb.framebuffer >= FB_MAX)
1185                         return -EINVAL;
1186                 if (!registered_fb[con2fb.framebuffer])
1187                         request_module("fb%d", con2fb.framebuffer);
1188                 if (!registered_fb[con2fb.framebuffer]) {
1189                         ret = -EINVAL;
1190                         break;
1191                 }
1192                 event.data = &con2fb;
1193                 console_lock();
1194                 if (!lock_fb_info(info)) {
1195                         console_unlock();
1196                         return -ENODEV;
1197                 }
1198                 event.info = info;
1199                 ret = fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP, &event);
1200                 unlock_fb_info(info);
1201                 console_unlock();
1202                 break;
1203         case FBIOBLANK:
1204                 console_lock();
1205                 if (!lock_fb_info(info)) {
1206                         console_unlock();
1207                         return -ENODEV;
1208                 }
1209                 info->flags |= FBINFO_MISC_USEREVENT;
1210                 ret = fb_blank(info, arg);
1211                 info->flags &= ~FBINFO_MISC_USEREVENT;
1212                 unlock_fb_info(info);
1213                 console_unlock();
1214                 break;
1215         default:
1216                 if (!lock_fb_info(info))
1217                         return -ENODEV;
1218                 fb = info->fbops;
1219                 if (fb->fb_ioctl)
1220                         ret = fb->fb_ioctl(info, cmd, arg);
1221                 else
1222                         ret = -ENOTTY;
1223                 unlock_fb_info(info);
1224         }
1225         return ret;
1226 }
1227
1228 static long fb_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1229 {
1230         struct fb_info *info = file_fb_info(file);
1231
1232         if (!info)
1233                 return -ENODEV;
1234         return do_fb_ioctl(info, cmd, arg);
1235 }
1236
1237 #ifdef CONFIG_COMPAT
1238 struct fb_fix_screeninfo32 {
1239         char                    id[16];
1240         compat_caddr_t          smem_start;
1241         u32                     smem_len;
1242         u32                     type;
1243         u32                     type_aux;
1244         u32                     visual;
1245         u16                     xpanstep;
1246         u16                     ypanstep;
1247         u16                     ywrapstep;
1248         u32                     line_length;
1249         compat_caddr_t          mmio_start;
1250         u32                     mmio_len;
1251         u32                     accel;
1252         u16                     reserved[3];
1253 };
1254
1255 struct fb_cmap32 {
1256         u32                     start;
1257         u32                     len;
1258         compat_caddr_t  red;
1259         compat_caddr_t  green;
1260         compat_caddr_t  blue;
1261         compat_caddr_t  transp;
1262 };
1263
1264 static int fb_getput_cmap(struct fb_info *info, unsigned int cmd,
1265                           unsigned long arg)
1266 {
1267         struct fb_cmap_user __user *cmap;
1268         struct fb_cmap32 __user *cmap32;
1269         __u32 data;
1270         int err;
1271
1272         cmap = compat_alloc_user_space(sizeof(*cmap));
1273         cmap32 = compat_ptr(arg);
1274
1275         if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1276                 return -EFAULT;
1277
1278         if (get_user(data, &cmap32->red) ||
1279             put_user(compat_ptr(data), &cmap->red) ||
1280             get_user(data, &cmap32->green) ||
1281             put_user(compat_ptr(data), &cmap->green) ||
1282             get_user(data, &cmap32->blue) ||
1283             put_user(compat_ptr(data), &cmap->blue) ||
1284             get_user(data, &cmap32->transp) ||
1285             put_user(compat_ptr(data), &cmap->transp))
1286                 return -EFAULT;
1287
1288         err = do_fb_ioctl(info, cmd, (unsigned long) cmap);
1289
1290         if (!err) {
1291                 if (copy_in_user(&cmap32->start,
1292                                  &cmap->start,
1293                                  2 * sizeof(__u32)))
1294                         err = -EFAULT;
1295         }
1296         return err;
1297 }
1298
1299 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1300                                   struct fb_fix_screeninfo32 __user *fix32)
1301 {
1302         __u32 data;
1303         int err;
1304
1305         err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1306
1307         data = (__u32) (unsigned long) fix->smem_start;
1308         err |= put_user(data, &fix32->smem_start);
1309
1310         err |= put_user(fix->smem_len, &fix32->smem_len);
1311         err |= put_user(fix->type, &fix32->type);
1312         err |= put_user(fix->type_aux, &fix32->type_aux);
1313         err |= put_user(fix->visual, &fix32->visual);
1314         err |= put_user(fix->xpanstep, &fix32->xpanstep);
1315         err |= put_user(fix->ypanstep, &fix32->ypanstep);
1316         err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1317         err |= put_user(fix->line_length, &fix32->line_length);
1318
1319         data = (__u32) (unsigned long) fix->mmio_start;
1320         err |= put_user(data, &fix32->mmio_start);
1321
1322         err |= put_user(fix->mmio_len, &fix32->mmio_len);
1323         err |= put_user(fix->accel, &fix32->accel);
1324         err |= copy_to_user(fix32->reserved, fix->reserved,
1325                             sizeof(fix->reserved));
1326
1327         if (err)
1328                 return -EFAULT;
1329         return 0;
1330 }
1331
1332 static int fb_get_fscreeninfo(struct fb_info *info, unsigned int cmd,
1333                               unsigned long arg)
1334 {
1335         struct fb_fix_screeninfo fix;
1336
1337         if (!lock_fb_info(info))
1338                 return -ENODEV;
1339         fix = info->fix;
1340         unlock_fb_info(info);
1341         return do_fscreeninfo_to_user(&fix, compat_ptr(arg));
1342 }
1343
1344 static long fb_compat_ioctl(struct file *file, unsigned int cmd,
1345                             unsigned long arg)
1346 {
1347         struct fb_info *info = file_fb_info(file);
1348         struct fb_ops *fb;
1349         long ret = -ENOIOCTLCMD;
1350
1351         if (!info)
1352                 return -ENODEV;
1353         fb = info->fbops;
1354         switch(cmd) {
1355         case FBIOGET_VSCREENINFO:
1356         case FBIOPUT_VSCREENINFO:
1357         case FBIOPAN_DISPLAY:
1358         case FBIOGET_CON2FBMAP:
1359         case FBIOPUT_CON2FBMAP:
1360                 arg = (unsigned long) compat_ptr(arg);
1361         case FBIOBLANK:
1362                 ret = do_fb_ioctl(info, cmd, arg);
1363                 break;
1364
1365         case FBIOGET_FSCREENINFO:
1366                 ret = fb_get_fscreeninfo(info, cmd, arg);
1367                 break;
1368
1369         case FBIOGETCMAP:
1370         case FBIOPUTCMAP:
1371                 ret = fb_getput_cmap(info, cmd, arg);
1372                 break;
1373
1374         default:
1375                 if (fb->fb_compat_ioctl)
1376                         ret = fb->fb_compat_ioctl(info, cmd, arg);
1377                 break;
1378         }
1379         return ret;
1380 }
1381 #endif
1382
1383 static int
1384 fb_mmap(struct file *file, struct vm_area_struct * vma)
1385 {
1386         struct fb_info *info = file_fb_info(file);
1387         struct fb_ops *fb;
1388         unsigned long mmio_pgoff;
1389         unsigned long start;
1390         u32 len;
1391
1392         if (!info)
1393                 return -ENODEV;
1394         fb = info->fbops;
1395         if (!fb)
1396                 return -ENODEV;
1397         mutex_lock(&info->mm_lock);
1398         if (fb->fb_mmap) {
1399                 int res;
1400                 res = fb->fb_mmap(info, vma);
1401                 mutex_unlock(&info->mm_lock);
1402                 return res;
1403         }
1404
1405         /*
1406          * Ugh. This can be either the frame buffer mapping, or
1407          * if pgoff points past it, the mmio mapping.
1408          */
1409         start = info->fix.smem_start;
1410         len = info->fix.smem_len;
1411         mmio_pgoff = PAGE_ALIGN((start & ~PAGE_MASK) + len) >> PAGE_SHIFT;
1412         if (vma->vm_pgoff >= mmio_pgoff) {
1413                 if (info->var.accel_flags) {
1414                         mutex_unlock(&info->mm_lock);
1415                         return -EINVAL;
1416                 }
1417
1418                 vma->vm_pgoff -= mmio_pgoff;
1419                 start = info->fix.mmio_start;
1420                 len = info->fix.mmio_len;
1421         }
1422         mutex_unlock(&info->mm_lock);
1423
1424         vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
1425         fb_pgprotect(file, vma, start);
1426
1427         return vm_iomap_memory(vma, start, len);
1428 }
1429
1430 static int
1431 fb_open(struct inode *inode, struct file *file)
1432 __acquires(&info->lock)
1433 __releases(&info->lock)
1434 {
1435         int fbidx = iminor(inode);
1436         struct fb_info *info;
1437         int res = 0;
1438
1439         info = get_fb_info(fbidx);
1440         if (!info) {
1441                 request_module("fb%d", fbidx);
1442                 info = get_fb_info(fbidx);
1443                 if (!info)
1444                         return -ENODEV;
1445         }
1446         if (IS_ERR(info))
1447                 return PTR_ERR(info);
1448
1449         mutex_lock(&info->lock);
1450         if (!try_module_get(info->fbops->owner)) {
1451                 res = -ENODEV;
1452                 goto out;
1453         }
1454         file->private_data = info;
1455         if (info->fbops->fb_open) {
1456                 res = info->fbops->fb_open(info,1);
1457                 if (res)
1458                         module_put(info->fbops->owner);
1459         }
1460 #ifdef CONFIG_FB_DEFERRED_IO
1461         if (info->fbdefio)
1462                 fb_deferred_io_open(info, inode, file);
1463 #endif
1464 out:
1465         mutex_unlock(&info->lock);
1466         if (res)
1467                 put_fb_info(info);
1468         return res;
1469 }
1470
1471 static int
1472 fb_release(struct inode *inode, struct file *file)
1473 __acquires(&info->lock)
1474 __releases(&info->lock)
1475 {
1476         struct fb_info * const info = file->private_data;
1477
1478         mutex_lock(&info->lock);
1479         if (info->fbops->fb_release)
1480                 info->fbops->fb_release(info,1);
1481         module_put(info->fbops->owner);
1482         mutex_unlock(&info->lock);
1483         put_fb_info(info);
1484         return 0;
1485 }
1486
1487 #if defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && !defined(CONFIG_MMU)
1488 unsigned long get_fb_unmapped_area(struct file *filp,
1489                                    unsigned long addr, unsigned long len,
1490                                    unsigned long pgoff, unsigned long flags)
1491 {
1492         struct fb_info * const info = filp->private_data;
1493         unsigned long fb_size = PAGE_ALIGN(info->fix.smem_len);
1494
1495         if (pgoff > fb_size || len > fb_size - pgoff)
1496                 return -EINVAL;
1497
1498         return (unsigned long)info->screen_base + pgoff;
1499 }
1500 #endif
1501
1502 static const struct file_operations fb_fops = {
1503         .owner =        THIS_MODULE,
1504         .read =         fb_read,
1505         .write =        fb_write,
1506         .unlocked_ioctl = fb_ioctl,
1507 #ifdef CONFIG_COMPAT
1508         .compat_ioctl = fb_compat_ioctl,
1509 #endif
1510         .mmap =         fb_mmap,
1511         .open =         fb_open,
1512         .release =      fb_release,
1513 #if defined(HAVE_ARCH_FB_UNMAPPED_AREA) || \
1514         (defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && \
1515          !defined(CONFIG_MMU))
1516         .get_unmapped_area = get_fb_unmapped_area,
1517 #endif
1518 #ifdef CONFIG_FB_DEFERRED_IO
1519         .fsync =        fb_deferred_io_fsync,
1520 #endif
1521         .llseek =       default_llseek,
1522 };
1523
1524 struct class *fb_class;
1525 EXPORT_SYMBOL(fb_class);
1526
1527 static int fb_check_foreignness(struct fb_info *fi)
1528 {
1529         const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN;
1530
1531         fi->flags &= ~FBINFO_FOREIGN_ENDIAN;
1532
1533 #ifdef __BIG_ENDIAN
1534         fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH;
1535 #else
1536         fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0;
1537 #endif /* __BIG_ENDIAN */
1538
1539         if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) {
1540                 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to "
1541                        "support this framebuffer\n", fi->fix.id);
1542                 return -ENOSYS;
1543         } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) {
1544                 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to "
1545                        "support this framebuffer\n", fi->fix.id);
1546                 return -ENOSYS;
1547         }
1548
1549         return 0;
1550 }
1551
1552 static bool apertures_overlap(struct aperture *gen, struct aperture *hw)
1553 {
1554         /* is the generic aperture base the same as the HW one */
1555         if (gen->base == hw->base)
1556                 return true;
1557         /* is the generic aperture base inside the hw base->hw base+size */
1558         if (gen->base > hw->base && gen->base < hw->base + hw->size)
1559                 return true;
1560         return false;
1561 }
1562
1563 static bool fb_do_apertures_overlap(struct apertures_struct *gena,
1564                                     struct apertures_struct *hwa)
1565 {
1566         int i, j;
1567         if (!hwa || !gena)
1568                 return false;
1569
1570         for (i = 0; i < hwa->count; ++i) {
1571                 struct aperture *h = &hwa->ranges[i];
1572                 for (j = 0; j < gena->count; ++j) {
1573                         struct aperture *g = &gena->ranges[j];
1574                         printk(KERN_DEBUG "checking generic (%llx %llx) vs hw (%llx %llx)\n",
1575                                 (unsigned long long)g->base,
1576                                 (unsigned long long)g->size,
1577                                 (unsigned long long)h->base,
1578                                 (unsigned long long)h->size);
1579                         if (apertures_overlap(g, h))
1580                                 return true;
1581                 }
1582         }
1583
1584         return false;
1585 }
1586
1587 static int do_unregister_framebuffer(struct fb_info *fb_info);
1588
1589 #define VGA_FB_PHYS 0xA0000
1590 static int do_remove_conflicting_framebuffers(struct apertures_struct *a,
1591                                               const char *name, bool primary)
1592 {
1593         int i, ret;
1594
1595         /* check all firmware fbs and kick off if the base addr overlaps */
1596         for (i = 0 ; i < FB_MAX; i++) {
1597                 struct apertures_struct *gen_aper;
1598                 if (!registered_fb[i])
1599                         continue;
1600
1601                 if (!(registered_fb[i]->flags & FBINFO_MISC_FIRMWARE))
1602                         continue;
1603
1604                 gen_aper = registered_fb[i]->apertures;
1605                 if (fb_do_apertures_overlap(gen_aper, a) ||
1606                         (primary && gen_aper && gen_aper->count &&
1607                          gen_aper->ranges[0].base == VGA_FB_PHYS)) {
1608
1609                         printk(KERN_INFO "fb: switching to %s from %s\n",
1610                                name, registered_fb[i]->fix.id);
1611                         ret = do_unregister_framebuffer(registered_fb[i]);
1612                         if (ret)
1613                                 return ret;
1614                 }
1615         }
1616
1617         return 0;
1618 }
1619
1620 static bool lockless_register_fb;
1621 module_param_named_unsafe(lockless_register_fb, lockless_register_fb, bool, 0400);
1622 MODULE_PARM_DESC(lockless_register_fb,
1623         "Lockless framebuffer registration for debugging [default=off]");
1624
1625 static int do_register_framebuffer(struct fb_info *fb_info)
1626 {
1627         int i, ret;
1628         struct fb_event event;
1629         struct fb_videomode mode;
1630
1631         if (fb_check_foreignness(fb_info))
1632                 return -ENOSYS;
1633
1634         ret = do_remove_conflicting_framebuffers(fb_info->apertures,
1635                                                  fb_info->fix.id,
1636                                                  fb_is_primary_device(fb_info));
1637         if (ret)
1638                 return ret;
1639
1640         if (num_registered_fb == FB_MAX)
1641                 return -ENXIO;
1642
1643         num_registered_fb++;
1644         for (i = 0 ; i < FB_MAX; i++)
1645                 if (!registered_fb[i])
1646                         break;
1647         fb_info->node = i;
1648         atomic_set(&fb_info->count, 1);
1649         mutex_init(&fb_info->lock);
1650         mutex_init(&fb_info->mm_lock);
1651
1652         fb_info->dev = device_create(fb_class, fb_info->device,
1653                                      MKDEV(FB_MAJOR, i), NULL, "fb%d", i);
1654         if (IS_ERR(fb_info->dev)) {
1655                 /* Not fatal */
1656                 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1657                 fb_info->dev = NULL;
1658         } else
1659                 fb_init_device(fb_info);
1660
1661         if (fb_info->pixmap.addr == NULL) {
1662                 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1663                 if (fb_info->pixmap.addr) {
1664                         fb_info->pixmap.size = FBPIXMAPSIZE;
1665                         fb_info->pixmap.buf_align = 1;
1666                         fb_info->pixmap.scan_align = 1;
1667                         fb_info->pixmap.access_align = 32;
1668                         fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1669                 }
1670         }
1671         fb_info->pixmap.offset = 0;
1672
1673         if (!fb_info->pixmap.blit_x)
1674                 fb_info->pixmap.blit_x = ~(u32)0;
1675
1676         if (!fb_info->pixmap.blit_y)
1677                 fb_info->pixmap.blit_y = ~(u32)0;
1678
1679         if (!fb_info->modelist.prev || !fb_info->modelist.next)
1680                 INIT_LIST_HEAD(&fb_info->modelist);
1681
1682         if (fb_info->skip_vt_switch)
1683                 pm_vt_switch_required(fb_info->dev, false);
1684         else
1685                 pm_vt_switch_required(fb_info->dev, true);
1686
1687         fb_var_to_videomode(&mode, &fb_info->var);
1688         fb_add_videomode(&mode, &fb_info->modelist);
1689         registered_fb[i] = fb_info;
1690
1691         event.info = fb_info;
1692         if (!lockless_register_fb)
1693                 console_lock();
1694         if (!lock_fb_info(fb_info)) {
1695                 if (!lockless_register_fb)
1696                         console_unlock();
1697                 return -ENODEV;
1698         }
1699
1700         fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1701         unlock_fb_info(fb_info);
1702         if (!lockless_register_fb)
1703                 console_unlock();
1704         return 0;
1705 }
1706
1707 static int do_unregister_framebuffer(struct fb_info *fb_info)
1708 {
1709         struct fb_event event;
1710         int i, ret = 0;
1711
1712         i = fb_info->node;
1713         if (i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)
1714                 return -EINVAL;
1715
1716         console_lock();
1717         if (!lock_fb_info(fb_info)) {
1718                 console_unlock();
1719                 return -ENODEV;
1720         }
1721
1722         event.info = fb_info;
1723         ret = fb_notifier_call_chain(FB_EVENT_FB_UNBIND, &event);
1724         unlock_fb_info(fb_info);
1725         console_unlock();
1726
1727         if (ret)
1728                 return -EINVAL;
1729
1730         pm_vt_switch_unregister(fb_info->dev);
1731
1732         unlink_framebuffer(fb_info);
1733         if (fb_info->pixmap.addr &&
1734             (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1735                 kfree(fb_info->pixmap.addr);
1736         fb_destroy_modelist(&fb_info->modelist);
1737         registered_fb[i] = NULL;
1738         num_registered_fb--;
1739         fb_cleanup_device(fb_info);
1740         event.info = fb_info;
1741         console_lock();
1742         fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1743         console_unlock();
1744
1745         /* this may free fb info */
1746         put_fb_info(fb_info);
1747         return 0;
1748 }
1749
1750 int unlink_framebuffer(struct fb_info *fb_info)
1751 {
1752         int i;
1753
1754         i = fb_info->node;
1755         if (i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)
1756                 return -EINVAL;
1757
1758         if (fb_info->dev) {
1759                 device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1760                 fb_info->dev = NULL;
1761         }
1762         return 0;
1763 }
1764 EXPORT_SYMBOL(unlink_framebuffer);
1765
1766 int remove_conflicting_framebuffers(struct apertures_struct *a,
1767                                     const char *name, bool primary)
1768 {
1769         int ret;
1770
1771         mutex_lock(&registration_lock);
1772         ret = do_remove_conflicting_framebuffers(a, name, primary);
1773         mutex_unlock(&registration_lock);
1774
1775         return ret;
1776 }
1777 EXPORT_SYMBOL(remove_conflicting_framebuffers);
1778
1779 /**
1780  *      register_framebuffer - registers a frame buffer device
1781  *      @fb_info: frame buffer info structure
1782  *
1783  *      Registers a frame buffer device @fb_info.
1784  *
1785  *      Returns negative errno on error, or zero for success.
1786  *
1787  */
1788 int
1789 register_framebuffer(struct fb_info *fb_info)
1790 {
1791         int ret;
1792
1793         mutex_lock(&registration_lock);
1794         ret = do_register_framebuffer(fb_info);
1795         mutex_unlock(&registration_lock);
1796
1797         return ret;
1798 }
1799 EXPORT_SYMBOL(register_framebuffer);
1800
1801 /**
1802  *      unregister_framebuffer - releases a frame buffer device
1803  *      @fb_info: frame buffer info structure
1804  *
1805  *      Unregisters a frame buffer device @fb_info.
1806  *
1807  *      Returns negative errno on error, or zero for success.
1808  *
1809  *      This function will also notify the framebuffer console
1810  *      to release the driver.
1811  *
1812  *      This is meant to be called within a driver's module_exit()
1813  *      function. If this is called outside module_exit(), ensure
1814  *      that the driver implements fb_open() and fb_release() to
1815  *      check that no processes are using the device.
1816  */
1817 int
1818 unregister_framebuffer(struct fb_info *fb_info)
1819 {
1820         int ret;
1821
1822         mutex_lock(&registration_lock);
1823         ret = do_unregister_framebuffer(fb_info);
1824         mutex_unlock(&registration_lock);
1825
1826         return ret;
1827 }
1828 EXPORT_SYMBOL(unregister_framebuffer);
1829
1830 /**
1831  *      fb_set_suspend - low level driver signals suspend
1832  *      @info: framebuffer affected
1833  *      @state: 0 = resuming, !=0 = suspending
1834  *
1835  *      This is meant to be used by low level drivers to
1836  *      signal suspend/resume to the core & clients.
1837  *      It must be called with the console semaphore held
1838  */
1839 void fb_set_suspend(struct fb_info *info, int state)
1840 {
1841         struct fb_event event;
1842
1843         event.info = info;
1844         if (state) {
1845                 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event);
1846                 info->state = FBINFO_STATE_SUSPENDED;
1847         } else {
1848                 info->state = FBINFO_STATE_RUNNING;
1849                 fb_notifier_call_chain(FB_EVENT_RESUME, &event);
1850         }
1851 }
1852 EXPORT_SYMBOL(fb_set_suspend);
1853
1854 /**
1855  *      fbmem_init - init frame buffer subsystem
1856  *
1857  *      Initialize the frame buffer subsystem.
1858  *
1859  *      NOTE: This function is _only_ to be called by drivers/char/mem.c.
1860  *
1861  */
1862
1863 static int __init
1864 fbmem_init(void)
1865 {
1866         int ret;
1867
1868         if (!proc_create("fb", 0, NULL, &fb_proc_fops))
1869                 return -ENOMEM;
1870
1871         ret = register_chrdev(FB_MAJOR, "fb", &fb_fops);
1872         if (ret) {
1873                 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1874                 goto err_chrdev;
1875         }
1876
1877         fb_class = class_create(THIS_MODULE, "graphics");
1878         if (IS_ERR(fb_class)) {
1879                 ret = PTR_ERR(fb_class);
1880                 pr_warn("Unable to create fb class; errno = %d\n", ret);
1881                 fb_class = NULL;
1882                 goto err_class;
1883         }
1884
1885         fb_console_init();
1886
1887         return 0;
1888
1889 err_class:
1890         unregister_chrdev(FB_MAJOR, "fb");
1891 err_chrdev:
1892         remove_proc_entry("fb", NULL);
1893         return ret;
1894 }
1895
1896 #ifdef MODULE
1897 module_init(fbmem_init);
1898 static void __exit
1899 fbmem_exit(void)
1900 {
1901         fb_console_exit();
1902
1903         remove_proc_entry("fb", NULL);
1904         class_destroy(fb_class);
1905         unregister_chrdev(FB_MAJOR, "fb");
1906 }
1907
1908 module_exit(fbmem_exit);
1909 MODULE_LICENSE("GPL");
1910 MODULE_DESCRIPTION("Framebuffer base");
1911 #else
1912 subsys_initcall(fbmem_init);
1913 #endif
1914
1915 int fb_new_modelist(struct fb_info *info)
1916 {
1917         struct fb_event event;
1918         struct fb_var_screeninfo var = info->var;
1919         struct list_head *pos, *n;
1920         struct fb_modelist *modelist;
1921         struct fb_videomode *m, mode;
1922         int err = 1;
1923
1924         list_for_each_safe(pos, n, &info->modelist) {
1925                 modelist = list_entry(pos, struct fb_modelist, list);
1926                 m = &modelist->mode;
1927                 fb_videomode_to_var(&var, m);
1928                 var.activate = FB_ACTIVATE_TEST;
1929                 err = fb_set_var(info, &var);
1930                 fb_var_to_videomode(&mode, &var);
1931                 if (err || !fb_mode_is_equal(m, &mode)) {
1932                         list_del(pos);
1933                         kfree(pos);
1934                 }
1935         }
1936
1937         err = 1;
1938
1939         if (!list_empty(&info->modelist)) {
1940                 event.info = info;
1941                 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
1942         }
1943
1944         return err;
1945 }
1946
1947 MODULE_LICENSE("GPL");