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