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 (image->width > info->var.xres || image->height > info->var.yres)
 429                 return;
 430
 431         if (rotate == FB_ROTATE_UR) {
 432                 for (x = 0;
 433                      x < num && image->dx + image->width <= info->var.xres;
 434                      x++) {
 435                         info->fbops->fb_imageblit(info, image);
 436                         image->dx += image->width + 8;
 437                 }
 438         } else if (rotate == FB_ROTATE_UD) {
 439                 u32 dx = image->dx;
 440
 441                 for (x = 0; x < num && image->dx <= dx; x++) {
 442                         info->fbops->fb_imageblit(info, image);
 443                         image->dx -= image->width + 8;
 444                 }
 445         } else if (rotate == FB_ROTATE_CW) {
 446                 for (x = 0;
 447                      x < num && image->dy + image->height <= info->var.yres;
 448                      x++) {
 449                         info->fbops->fb_imageblit(info, image);
 450                         image->dy += image->height + 8;
 451                 }
 452         } else if (rotate == FB_ROTATE_CCW) {
 453                 u32 dy = image->dy;
 454
 455                 for (x = 0; x < num && image->dy <= dy; x++) {
 456                         info->fbops->fb_imageblit(info, image);
 457                         image->dy -= image->height + 8;
 458                 }
 459         }
 460 }
 461
 462 static int fb_show_logo_line(struct fb_info *info, int rotate,
 463                              const struct linux_logo *logo, int y,
 464                              unsigned int n)
 465 {
 466         u32 *palette = NULL, *saved_pseudo_palette = NULL;
 467         unsigned char *logo_new = NULL, *logo_rotate = NULL;
 468         struct fb_image image;
 469
 470         /* Return if the frame buffer is not mapped or suspended */
 471         if (logo == NULL || info->state != FBINFO_STATE_RUNNING ||
 472             info->flags & FBINFO_MODULE)
 473                 return 0;
 474
 475         image.depth = 8;
 476         image.data = logo->data;
 477
 478         if (fb_logo.needs_cmapreset)
 479                 fb_set_logocmap(info, logo);
 480
 481         if (fb_logo.needs_truepalette ||
 482             fb_logo.needs_directpalette) {
 483                 palette = kmalloc(256 * 4, GFP_KERNEL);
 484                 if (palette == NULL)
 485                         return 0;
 486
 487                 if (fb_logo.needs_truepalette)
 488                         fb_set_logo_truepalette(info, logo, palette);
 489                 else
 490                         fb_set_logo_directpalette(info, logo, palette);
 491
 492                 saved_pseudo_palette = info->pseudo_palette;
 493                 info->pseudo_palette = palette;
 494         }
 495
 496         if (fb_logo.depth <= 4) {
 497                 logo_new = kmalloc(logo->width * logo->height, GFP_KERNEL);
 498                 if (logo_new == NULL) {
 499                         kfree(palette);
 500                         if (saved_pseudo_palette)
 501                                 info->pseudo_palette = saved_pseudo_palette;
 502                         return 0;
 503                 }
 504                 image.data = logo_new;
 505                 fb_set_logo(info, logo, logo_new, fb_logo.depth);
 506         }
 507
 508         image.dx = 0;
 509         image.dy = y;
 510         image.width = logo->width;
 511         image.height = logo->height;
 512
 513         if (rotate) {
 514                 logo_rotate = kmalloc(logo->width *
 515                                       logo->height, GFP_KERNEL);
 516                 if (logo_rotate)
 517                         fb_rotate_logo(info, logo_rotate, &image, rotate);
 518         }
 519
 520         fb_do_show_logo(info, &image, rotate, n);
 521
 522         kfree(palette);
 523         if (saved_pseudo_palette != NULL)
 524                 info->pseudo_palette = saved_pseudo_palette;
 525         kfree(logo_new);
 526         kfree(logo_rotate);
 527         return logo->height;
 528 }
 529
 530
 531 #ifdef CONFIG_FB_LOGO_EXTRA
 532
 533 #define FB_LOGO_EX_NUM_MAX 10
 534 static struct logo_data_extra {
 535         const struct linux_logo *logo;
 536         unsigned int n;
 537 } fb_logo_ex[FB_LOGO_EX_NUM_MAX];
 538 static unsigned int fb_logo_ex_num;
 539
 540 void fb_append_extra_logo(const struct linux_logo *logo, unsigned int n)
 541 {
 542         if (!n || fb_logo_ex_num == FB_LOGO_EX_NUM_MAX)
 543                 return;
 544
 545         fb_logo_ex[fb_logo_ex_num].logo = logo;
 546         fb_logo_ex[fb_logo_ex_num].n = n;
 547         fb_logo_ex_num++;
 548 }
 549
 550 static int fb_prepare_extra_logos(struct fb_info *info, unsigned int height,
 551                                   unsigned int yres)
 552 {
 553         unsigned int i;
 554
 555         /* FIXME: logo_ex supports only truecolor fb. */
 556         if (info->fix.visual != FB_VISUAL_TRUECOLOR)
 557                 fb_logo_ex_num = 0;
 558
 559         for (i = 0; i < fb_logo_ex_num; i++) {
 560                 if (fb_logo_ex[i].logo->type != fb_logo.logo->type) {
 561                         fb_logo_ex[i].logo = NULL;
 562                         continue;
 563                 }
 564                 height += fb_logo_ex[i].logo->height;
 565                 if (height > yres) {
 566                         height -= fb_logo_ex[i].logo->height;
 567                         fb_logo_ex_num = i;
 568                         break;
 569                 }
 570         }
 571         return height;
 572 }
 573
 574 static int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
 575 {
 576         unsigned int i;
 577
 578         for (i = 0; i < fb_logo_ex_num; i++)
 579                 y += fb_show_logo_line(info, rotate,
 580                                        fb_logo_ex[i].logo, y, fb_logo_ex[i].n);
 581
 582         return y;
 583 }
 584
 585 #else /* !CONFIG_FB_LOGO_EXTRA */
 586
 587 static inline int fb_prepare_extra_logos(struct fb_info *info,
 588                                          unsigned int height,
 589                                          unsigned int yres)
 590 {
 591         return height;
 592 }
 593
 594 static inline int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
 595 {
 596         return y;
 597 }
 598
 599 #endif /* CONFIG_FB_LOGO_EXTRA */
 600
 601
 602 int fb_prepare_logo(struct fb_info *info, int rotate)
 603 {
 604         int depth = fb_get_color_depth(&info->var, &info->fix);
 605         unsigned int yres;
 606
 607         memset(&fb_logo, 0, sizeof(struct logo_data));
 608
 609         if (info->flags & FBINFO_MISC_TILEBLITTING ||
 610             info->flags & FBINFO_MODULE)
 611                 return 0;
 612
 613         if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
 614                 depth = info->var.blue.length;
 615                 if (info->var.red.length < depth)
 616                         depth = info->var.red.length;
 617                 if (info->var.green.length < depth)
 618                         depth = info->var.green.length;
 619         }
 620
 621         if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) {
 622                 /* assume console colormap */
 623                 depth = 4;
 624         }
 625
 626         /* Return if no suitable logo was found */
 627         fb_logo.logo = fb_find_logo(depth);
 628
 629         if (!fb_logo.logo) {
 630                 return 0;
 631         }
 632
 633         if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
 634                 yres = info->var.yres;
 635         else
 636                 yres = info->var.xres;
 637
 638         if (fb_logo.logo->height > yres) {
 639                 fb_logo.logo = NULL;
 640                 return 0;
 641         }
 642
 643         /* What depth we asked for might be different from what we get */
 644         if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
 645                 fb_logo.depth = 8;
 646         else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
 647                 fb_logo.depth = 4;
 648         else
 649                 fb_logo.depth = 1;
 650
 651
 652         if (fb_logo.depth > 4 && depth > 4) {
 653                 switch (info->fix.visual) {
 654                 case FB_VISUAL_TRUECOLOR:
 655                         fb_logo.needs_truepalette = 1;
 656                         break;
 657                 case FB_VISUAL_DIRECTCOLOR:
 658                         fb_logo.needs_directpalette = 1;
 659                         fb_logo.needs_cmapreset = 1;
 660                         break;
 661                 case FB_VISUAL_PSEUDOCOLOR:
 662                         fb_logo.needs_cmapreset = 1;
 663                         break;
 664                 }
 665         }
 666
 667         return fb_prepare_extra_logos(info, fb_logo.logo->height, yres);
 668 }
 669
 670 int fb_show_logo(struct fb_info *info, int rotate)
 671 {
 672         int y;
 673
 674         y = fb_show_logo_line(info, rotate, fb_logo.logo, 0,
 675                               num_online_cpus());
 676         y = fb_show_extra_logos(info, y, rotate);
 677
 678         return y;
 679 }
 680 #else
 681 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
 682 int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
 683 #endif /* CONFIG_LOGO */
 684 EXPORT_SYMBOL(fb_prepare_logo);
 685 EXPORT_SYMBOL(fb_show_logo);
 686
 687 static void *fb_seq_start(struct seq_file *m, loff_t *pos)
 688 {
 689         mutex_lock(&registration_lock);
 690         return (*pos < FB_MAX) ? pos : NULL;
 691 }
 692
 693 static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos)
 694 {
 695         (*pos)++;
 696         return (*pos < FB_MAX) ? pos : NULL;
 697 }
 698
 699 static void fb_seq_stop(struct seq_file *m, void *v)
 700 {
 701         mutex_unlock(&registration_lock);
 702 }
 703
 704 static int fb_seq_show(struct seq_file *m, void *v)
 705 {
 706         int i = *(loff_t *)v;
 707         struct fb_info *fi = registered_fb[i];
 708
 709         if (fi)
 710                 seq_printf(m, "%d %s\n", fi->node, fi->fix.id);
 711         return 0;
 712 }
 713
 714 static const struct seq_operations proc_fb_seq_ops = {
 715         .start  = fb_seq_start,
 716         .next   = fb_seq_next,
 717         .stop   = fb_seq_stop,
 718         .show   = fb_seq_show,
 719 };
 720
 721 static int proc_fb_open(struct inode *inode, struct file *file)
 722 {
 723         return seq_open(file, &proc_fb_seq_ops);
 724 }
 725
 726 static const struct file_operations fb_proc_fops = {
 727         .owner          = THIS_MODULE,
 728         .open           = proc_fb_open,
 729         .read           = seq_read,
 730         .llseek         = seq_lseek,
 731         .release        = seq_release,
 732 };
 733
 734 /*
 735  * We hold a reference to the fb_info in file->private_data,
 736  * but if the current registered fb has changed, we don't
 737  * actually want to use it.
 738  *
 739  * So look up the fb_info using the inode minor number,
 740  * and just verify it against the reference we have.
 741  */
 742 static struct fb_info *file_fb_info(struct file *file)
 743 {
 744         struct inode *inode = file_inode(file);
 745         int fbidx = iminor(inode);
 746         struct fb_info *info = registered_fb[fbidx];
 747
 748         if (info != file->private_data)
 749                 info = NULL;
 750         return info;
 751 }
 752
 753 static ssize_t
 754 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 755 {
 756         unsigned long p = *ppos;
 757         struct fb_info *info = file_fb_info(file);
 758         u8 *buffer, *dst;
 759         u8 __iomem *src;
 760         int c, cnt = 0, err = 0;
 761         unsigned long total_size;
 762
 763         if (!info || ! info->screen_base)
 764                 return -ENODEV;
 765
 766         if (info->state != FBINFO_STATE_RUNNING)
 767                 return -EPERM;
 768
 769         if (info->fbops->fb_read)
 770                 return info->fbops->fb_read(info, buf, count, ppos);
 771
 772         total_size = info->screen_size;
 773
 774         if (total_size == 0)
 775                 total_size = info->fix.smem_len;
 776
 777         if (p >= total_size)
 778                 return 0;
 779
 780         if (count >= total_size)
 781                 count = total_size;
 782
 783         if (count + p > total_size)
 784                 count = total_size - p;
 785
 786         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 787                          GFP_KERNEL);
 788         if (!buffer)
 789                 return -ENOMEM;
 790
 791         src = (u8 __iomem *) (info->screen_base + p);
 792
 793         if (info->fbops->fb_sync)
 794                 info->fbops->fb_sync(info);
 795
 796         while (count) {
 797                 c  = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 798                 dst = buffer;
 799                 fb_memcpy_fromfb(dst, src, c);
 800                 dst += c;
 801                 src += c;
 802
 803                 if (copy_to_user(buf, buffer, c)) {
 804                         err = -EFAULT;
 805                         break;
 806                 }
 807                 *ppos += c;
 808                 buf += c;
 809                 cnt += c;
 810                 count -= c;
 811         }
 812
 813         kfree(buffer);
 814
 815         return (err) ? err : cnt;
 816 }
 817
 818 static ssize_t
 819 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 820 {
 821         unsigned long p = *ppos;
 822         struct fb_info *info = file_fb_info(file);
 823         u8 *buffer, *src;
 824         u8 __iomem *dst;
 825         int c, cnt = 0, err = 0;
 826         unsigned long total_size;
 827
 828         if (!info || !info->screen_base)
 829                 return -ENODEV;
 830
 831         if (info->state != FBINFO_STATE_RUNNING)
 832                 return -EPERM;
 833
 834         if (info->fbops->fb_write)
 835                 return info->fbops->fb_write(info, buf, count, ppos);
 836
 837         total_size = info->screen_size;
 838
 839         if (total_size == 0)
 840                 total_size = info->fix.smem_len;
 841
 842         if (p > total_size)
 843                 return -EFBIG;
 844
 845         if (count > total_size) {
 846                 err = -EFBIG;
 847                 count = total_size;
 848         }
 849
 850         if (count + p > total_size) {
 851                 if (!err)
 852                         err = -ENOSPC;
 853
 854                 count = total_size - p;
 855         }
 856
 857         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 858                          GFP_KERNEL);
 859         if (!buffer)
 860                 return -ENOMEM;
 861
 862         dst = (u8 __iomem *) (info->screen_base + p);
 863
 864         if (info->fbops->fb_sync)
 865                 info->fbops->fb_sync(info);
 866
 867         while (count) {
 868                 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 869                 src = buffer;
 870
 871                 if (copy_from_user(src, buf, c)) {
 872                         err = -EFAULT;
 873                         break;
 874                 }
 875
 876                 fb_memcpy_tofb(dst, src, c);
 877                 dst += c;
 878                 src += c;
 879                 *ppos += c;
 880                 buf += c;
 881                 cnt += c;
 882                 count -= c;
 883         }
 884
 885         kfree(buffer);
 886
 887         return (cnt) ? cnt : err;
 888 }
 889
 890 int
 891 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
 892 {
 893         struct fb_fix_screeninfo *fix = &info->fix;
 894         unsigned int yres = info->var.yres;
 895         int err = 0;
 896
 897         if (var->yoffset > 0) {
 898                 if (var->vmode & FB_VMODE_YWRAP) {
 899                         if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
 900                                 err = -EINVAL;
 901                         else
 902                                 yres = 0;
 903                 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
 904                         err = -EINVAL;
 905         }
 906
 907         if (var->xoffset > 0 && (!fix->xpanstep ||
 908                                  (var->xoffset % fix->xpanstep)))
 909                 err = -EINVAL;
 910
 911         if (err || !info->fbops->fb_pan_display ||
 912             var->yoffset > info->var.yres_virtual - yres ||
 913             var->xoffset > info->var.xres_virtual - info->var.xres)
 914                 return -EINVAL;
 915
 916         if ((err = info->fbops->fb_pan_display(var, info)))
 917                 return err;
 918         info->var.xoffset = var->xoffset;
 919         info->var.yoffset = var->yoffset;
 920         if (var->vmode & FB_VMODE_YWRAP)
 921                 info->var.vmode |= FB_VMODE_YWRAP;
 922         else
 923                 info->var.vmode &= ~FB_VMODE_YWRAP;
 924         return 0;
 925 }
 926 EXPORT_SYMBOL(fb_pan_display);
 927
 928 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var,
 929                          u32 activate)
 930 {
 931         struct fb_event event;
 932         struct fb_blit_caps caps, fbcaps;
 933         int err = 0;
 934
 935         memset(&caps, 0, sizeof(caps));
 936         memset(&fbcaps, 0, sizeof(fbcaps));
 937         caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0;
 938         event.info = info;
 939         event.data = &caps;
 940         fb_notifier_call_chain(FB_EVENT_GET_REQ, &event);
 941         info->fbops->fb_get_caps(info, &fbcaps, var);
 942
 943         if (((fbcaps.x ^ caps.x) & caps.x) ||
 944             ((fbcaps.y ^ caps.y) & caps.y) ||
 945             (fbcaps.len < caps.len))
 946                 err = -EINVAL;
 947
 948         return err;
 949 }
 950
 951 int
 952 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
 953 {
 954         int flags = info->flags;
 955         int ret = 0;
 956
 957         if (var->activate & FB_ACTIVATE_INV_MODE) {
 958                 struct fb_videomode mode1, mode2;
 959
 960                 fb_var_to_videomode(&mode1, var);
 961                 fb_var_to_videomode(&mode2, &info->var);
 962                 /* make sure we don't delete the videomode of current var */
 963                 ret = fb_mode_is_equal(&mode1, &mode2);
 964
 965                 if (!ret) {
 966                     struct fb_event event;
 967
 968                     event.info = info;
 969                     event.data = &mode1;
 970                     ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event);
 971                 }
 972
 973                 if (!ret)
 974                     fb_delete_videomode(&mode1, &info->modelist);
 975
 976
 977                 ret = (ret) ? -EINVAL : 0;
 978                 goto done;
 979         }
 980
 981         if ((var->activate & FB_ACTIVATE_FORCE) ||
 982             memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
 983                 u32 activate = var->activate;
 984
 985                 /* When using FOURCC mode, make sure the red, green, blue and
 986                  * transp fields are set to 0.
 987                  */
 988                 if ((info->fix.capabilities & FB_CAP_FOURCC) &&
 989                     var->grayscale > 1) {
 990                         if (var->red.offset     || var->green.offset    ||
 991                             var->blue.offset    || var->transp.offset   ||
 992                             var->red.length     || var->green.length    ||
 993                             var->blue.length    || var->transp.length   ||
 994                             var->red.msb_right  || var->green.msb_right ||
 995                             var->blue.msb_right || var->transp.msb_right)
 996                                 return -EINVAL;
 997                 }
 998
 999                 if (!info->fbops->fb_check_var) {
1000                         *var = info->var;
1001                         goto done;
1002                 }
1003
1004                 ret = info->fbops->fb_check_var(var, info);
1005
1006                 if (ret)
1007                         goto done;
1008
1009                 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
1010                         struct fb_var_screeninfo old_var;
1011                         struct fb_videomode mode;
1012
1013                         if (info->fbops->fb_get_caps) {
1014                                 ret = fb_check_caps(info, var, activate);
1015
1016                                 if (ret)
1017                                         goto done;
1018                         }
1019
1020                         old_var = info->var;
1021                         info->var = *var;
1022
1023                         if (info->fbops->fb_set_par) {
1024                                 ret = info->fbops->fb_set_par(info);
1025
1026                                 if (ret) {
1027                                         info->var = old_var;
1028                                         printk(KERN_WARNING "detected "
1029                                                 "fb_set_par error, "
1030                                                 "error code: %d\n", ret);
1031                                         goto done;
1032                                 }
1033                         }
1034
1035                         fb_pan_display(info, &info->var);
1036                         fb_set_cmap(&info->cmap, info);
1037                         fb_var_to_videomode(&mode, &info->var);
1038
1039                         if (info->modelist.prev && info->modelist.next &&
1040                             !list_empty(&info->modelist))
1041                                 ret = fb_add_videomode(&mode, &info->modelist);
1042
1043                         if (!ret && (flags & FBINFO_MISC_USEREVENT)) {
1044                                 struct fb_event event;
1045                                 int evnt = (activate & FB_ACTIVATE_ALL) ?
1046                                         FB_EVENT_MODE_CHANGE_ALL :
1047                                         FB_EVENT_MODE_CHANGE;
1048
1049                                 info->flags &= ~FBINFO_MISC_USEREVENT;
1050                                 event.info = info;
1051                                 event.data = &mode;
1052                                 fb_notifier_call_chain(evnt, &event);
1053                         }
1054                 }
1055         }
1056
1057  done:
1058         return ret;
1059 }
1060 EXPORT_SYMBOL(fb_set_var);
1061
1062 int
1063 fb_blank(struct fb_info *info, int blank)
1064 {
1065         struct fb_event event;
1066         int ret = -EINVAL, early_ret;
1067
1068         if (blank > FB_BLANK_POWERDOWN)
1069                 blank = FB_BLANK_POWERDOWN;
1070
1071         event.info = info;
1072         event.data = &blank;
1073
1074         early_ret = fb_notifier_call_chain(FB_EARLY_EVENT_BLANK, &event);
1075
1076         if (info->fbops->fb_blank)
1077                 ret = info->fbops->fb_blank(blank, info);
1078
1079         if (!ret)
1080                 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
1081         else {
1082                 /*
1083                  * if fb_blank is failed then revert effects of
1084                  * the early blank event.
1085                  */
1086                 if (!early_ret)
1087                         fb_notifier_call_chain(FB_R_EARLY_EVENT_BLANK, &event);
1088         }
1089
1090         return ret;
1091 }
1092 EXPORT_SYMBOL(fb_blank);
1093
1094 static long do_fb_ioctl(struct fb_info *info, unsigned int cmd,
1095                         unsigned long arg)
1096 {
1097         struct fb_ops *fb;
1098         struct fb_var_screeninfo var;
1099         struct fb_fix_screeninfo fix;
1100         struct fb_con2fbmap con2fb;
1101         struct fb_cmap cmap_from;
1102         struct fb_cmap_user cmap;
1103         struct fb_event event;
1104         void __user *argp = (void __user *)arg;
1105         long ret = 0;
1106
1107         switch (cmd) {
1108         case FBIOGET_VSCREENINFO:
1109                 if (!lock_fb_info(info))
1110                         return -ENODEV;
1111                 var = info->var;
1112                 unlock_fb_info(info);
1113
1114                 ret = copy_to_user(argp, &var, sizeof(var)) ? -EFAULT : 0;
1115                 break;
1116         case FBIOPUT_VSCREENINFO:
1117                 if (copy_from_user(&var, argp, sizeof(var)))
1118                         return -EFAULT;
1119                 console_lock();
1120                 if (!lock_fb_info(info)) {
1121                         console_unlock();
1122                         return -ENODEV;
1123                 }
1124                 info->flags |= FBINFO_MISC_USEREVENT;
1125                 ret = fb_set_var(info, &var);
1126                 info->flags &= ~FBINFO_MISC_USEREVENT;
1127                 unlock_fb_info(info);
1128                 console_unlock();
1129                 if (!ret && copy_to_user(argp, &var, sizeof(var)))
1130                         ret = -EFAULT;
1131                 break;
1132         case FBIOGET_FSCREENINFO:
1133                 if (!lock_fb_info(info))
1134                         return -ENODEV;
1135                 memcpy(&fix, &info->fix, sizeof(fix));
1136                 unlock_fb_info(info);
1137
1138                 ret = copy_to_user(argp, &fix, sizeof(fix)) ? -EFAULT : 0;
1139                 break;
1140         case FBIOPUTCMAP:
1141                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1142                         return -EFAULT;
1143                 ret = fb_set_user_cmap(&cmap, info);
1144                 break;
1145         case FBIOGETCMAP:
1146                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1147                         return -EFAULT;
1148                 if (!lock_fb_info(info))
1149                         return -ENODEV;
1150                 cmap_from = info->cmap;
1151                 unlock_fb_info(info);
1152                 ret = fb_cmap_to_user(&cmap_from, &cmap);
1153                 break;
1154         case FBIOPAN_DISPLAY:
1155                 if (copy_from_user(&var, argp, sizeof(var)))
1156                         return -EFAULT;
1157                 console_lock();
1158                 if (!lock_fb_info(info)) {
1159                         console_unlock();
1160                         return -ENODEV;
1161                 }
1162                 ret = fb_pan_display(info, &var);
1163                 unlock_fb_info(info);
1164                 console_unlock();
1165                 if (ret == 0 && copy_to_user(argp, &var, sizeof(var)))
1166                         return -EFAULT;
1167                 break;
1168         case FBIO_CURSOR:
1169                 ret = -EINVAL;
1170                 break;
1171         case FBIOGET_CON2FBMAP:
1172                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1173                         return -EFAULT;
1174                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1175                         return -EINVAL;
1176                 con2fb.framebuffer = -1;
1177                 event.data = &con2fb;
1178                 if (!lock_fb_info(info))
1179                         return -ENODEV;
1180                 event.info = info;
1181                 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
1182                 unlock_fb_info(info);
1183                 ret = copy_to_user(argp, &con2fb, sizeof(con2fb)) ? -EFAULT : 0;
1184                 break;
1185         case FBIOPUT_CON2FBMAP:
1186                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1187                         return -EFAULT;
1188                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1189                         return -EINVAL;
1190                 if (con2fb.framebuffer >= FB_MAX)
1191                         return -EINVAL;
1192                 if (!registered_fb[con2fb.framebuffer])
1193                         request_module("fb%d", con2fb.framebuffer);
1194                 if (!registered_fb[con2fb.framebuffer]) {
1195                         ret = -EINVAL;
1196                         break;
1197                 }
1198                 event.data = &con2fb;
1199                 console_lock();
1200                 if (!lock_fb_info(info)) {
1201                         console_unlock();
1202                         return -ENODEV;
1203                 }
1204                 event.info = info;
1205                 ret = fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP, &event);
1206                 unlock_fb_info(info);
1207                 console_unlock();
1208                 break;
1209         case FBIOBLANK:
1210                 console_lock();
1211                 if (!lock_fb_info(info)) {
1212                         console_unlock();
1213                         return -ENODEV;
1214                 }
1215                 info->flags |= FBINFO_MISC_USEREVENT;
1216                 ret = fb_blank(info, arg);
1217                 info->flags &= ~FBINFO_MISC_USEREVENT;
1218                 unlock_fb_info(info);
1219                 console_unlock();
1220                 break;
1221         default:
1222                 if (!lock_fb_info(info))
1223                         return -ENODEV;
1224                 fb = info->fbops;
1225                 if (fb->fb_ioctl)
1226                         ret = fb->fb_ioctl(info, cmd, arg);
1227                 else
1228                         ret = -ENOTTY;
1229                 unlock_fb_info(info);
1230         }
1231         return ret;
1232 }
1233
1234 static long fb_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1235 {
1236         struct fb_info *info = file_fb_info(file);
1237
1238         if (!info)
1239                 return -ENODEV;
1240         return do_fb_ioctl(info, cmd, arg);
1241 }
1242
1243 #ifdef CONFIG_COMPAT
1244 struct fb_fix_screeninfo32 {
1245         char                    id[16];
1246         compat_caddr_t          smem_start;
1247         u32                     smem_len;
1248         u32                     type;
1249         u32                     type_aux;
1250         u32                     visual;
1251         u16                     xpanstep;
1252         u16                     ypanstep;
1253         u16                     ywrapstep;
1254         u32                     line_length;
1255         compat_caddr_t          mmio_start;
1256         u32                     mmio_len;
1257         u32                     accel;
1258         u16                     reserved[3];
1259 };
1260
1261 struct fb_cmap32 {
1262         u32                     start;
1263         u32                     len;
1264         compat_caddr_t  red;
1265         compat_caddr_t  green;
1266         compat_caddr_t  blue;
1267         compat_caddr_t  transp;
1268 };
1269
1270 static int fb_getput_cmap(struct fb_info *info, unsigned int cmd,
1271                           unsigned long arg)
1272 {
1273         struct fb_cmap_user __user *cmap;
1274         struct fb_cmap32 __user *cmap32;
1275         __u32 data;
1276         int err;
1277
1278         cmap = compat_alloc_user_space(sizeof(*cmap));
1279         cmap32 = compat_ptr(arg);
1280
1281         if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1282                 return -EFAULT;
1283
1284         if (get_user(data, &cmap32->red) ||
1285             put_user(compat_ptr(data), &cmap->red) ||
1286             get_user(data, &cmap32->green) ||
1287             put_user(compat_ptr(data), &cmap->green) ||
1288             get_user(data, &cmap32->blue) ||
1289             put_user(compat_ptr(data), &cmap->blue) ||
1290             get_user(data, &cmap32->transp) ||
1291             put_user(compat_ptr(data), &cmap->transp))
1292                 return -EFAULT;
1293
1294         err = do_fb_ioctl(info, cmd, (unsigned long) cmap);
1295
1296         if (!err) {
1297                 if (copy_in_user(&cmap32->start,
1298                                  &cmap->start,
1299                                  2 * sizeof(__u32)))
1300                         err = -EFAULT;
1301         }
1302         return err;
1303 }
1304
1305 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1306                                   struct fb_fix_screeninfo32 __user *fix32)
1307 {
1308         __u32 data;
1309         int err;
1310
1311         err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1312
1313         data = (__u32) (unsigned long) fix->smem_start;
1314         err |= put_user(data, &fix32->smem_start);
1315
1316         err |= put_user(fix->smem_len, &fix32->smem_len);
1317         err |= put_user(fix->type, &fix32->type);
1318         err |= put_user(fix->type_aux, &fix32->type_aux);
1319         err |= put_user(fix->visual, &fix32->visual);
1320         err |= put_user(fix->xpanstep, &fix32->xpanstep);
1321         err |= put_user(fix->ypanstep, &fix32->ypanstep);
1322         err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1323         err |= put_user(fix->line_length, &fix32->line_length);
1324
1325         data = (__u32) (unsigned long) fix->mmio_start;
1326         err |= put_user(data, &fix32->mmio_start);
1327
1328         err |= put_user(fix->mmio_len, &fix32->mmio_len);
1329         err |= put_user(fix->accel, &fix32->accel);
1330         err |= copy_to_user(fix32->reserved, fix->reserved,
1331                             sizeof(fix->reserved));
1332
1333         if (err)
1334                 return -EFAULT;
1335         return 0;
1336 }
1337
1338 static int fb_get_fscreeninfo(struct fb_info *info, unsigned int cmd,
1339                               unsigned long arg)
1340 {
1341         mm_segment_t old_fs;
1342         struct fb_fix_screeninfo fix;
1343         struct fb_fix_screeninfo32 __user *fix32;
1344         int err;
1345
1346         fix32 = compat_ptr(arg);
1347
1348         old_fs = get_fs();
1349         set_fs(KERNEL_DS);
1350         err = do_fb_ioctl(info, cmd, (unsigned long) &fix);
1351         set_fs(old_fs);
1352
1353         if (!err)
1354                 err = do_fscreeninfo_to_user(&fix, fix32);
1355
1356         return err;
1357 }
1358
1359 static long fb_compat_ioctl(struct file *file, unsigned int cmd,
1360                             unsigned long arg)
1361 {
1362         struct fb_info *info = file_fb_info(file);
1363         struct fb_ops *fb;
1364         long ret = -ENOIOCTLCMD;
1365
1366         if (!info)
1367                 return -ENODEV;
1368         fb = info->fbops;
1369         switch(cmd) {
1370         case FBIOGET_VSCREENINFO:
1371         case FBIOPUT_VSCREENINFO:
1372         case FBIOPAN_DISPLAY:
1373         case FBIOGET_CON2FBMAP:
1374         case FBIOPUT_CON2FBMAP:
1375                 arg = (unsigned long) compat_ptr(arg);
1376         case FBIOBLANK:
1377                 ret = do_fb_ioctl(info, cmd, arg);
1378                 break;
1379
1380         case FBIOGET_FSCREENINFO:
1381                 ret = fb_get_fscreeninfo(info, cmd, arg);
1382                 break;
1383
1384         case FBIOGETCMAP:
1385         case FBIOPUTCMAP:
1386                 ret = fb_getput_cmap(info, cmd, arg);
1387                 break;
1388
1389         default:
1390                 if (fb->fb_compat_ioctl)
1391                         ret = fb->fb_compat_ioctl(info, cmd, arg);
1392                 break;
1393         }
1394         return ret;
1395 }
1396 #endif
1397
1398 static int
1399 fb_mmap(struct file *file, struct vm_area_struct * vma)
1400 {
1401         struct fb_info *info = file_fb_info(file);
1402         struct fb_ops *fb;
1403         unsigned long mmio_pgoff;
1404         unsigned long start;
1405         u32 len;
1406
1407         if (!info)
1408                 return -ENODEV;
1409         fb = info->fbops;
1410         if (!fb)
1411                 return -ENODEV;
1412         mutex_lock(&info->mm_lock);
1413         if (fb->fb_mmap) {
1414                 int res;
1415                 res = fb->fb_mmap(info, vma);
1416                 mutex_unlock(&info->mm_lock);
1417                 return res;
1418         }
1419
1420         /*
1421          * Ugh. This can be either the frame buffer mapping, or
1422          * if pgoff points past it, the mmio mapping.
1423          */
1424         start = info->fix.smem_start;
1425         len = info->fix.smem_len;
1426         mmio_pgoff = PAGE_ALIGN((start & ~PAGE_MASK) + len) >> PAGE_SHIFT;
1427         if (vma->vm_pgoff >= mmio_pgoff) {
1428                 if (info->var.accel_flags) {
1429                         mutex_unlock(&info->mm_lock);
1430                         return -EINVAL;
1431                 }
1432
1433                 vma->vm_pgoff -= mmio_pgoff;
1434                 start = info->fix.mmio_start;
1435                 len = info->fix.mmio_len;
1436         }
1437         mutex_unlock(&info->mm_lock);
1438
1439         vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
1440         fb_pgprotect(file, vma, start);
1441
1442         return vm_iomap_memory(vma, start, len);
1443 }
1444
1445 static int
1446 fb_open(struct inode *inode, struct file *file)
1447 __acquires(&info->lock)
1448 __releases(&info->lock)
1449 {
1450         int fbidx = iminor(inode);
1451         struct fb_info *info;
1452         int res = 0;
1453
1454         info = get_fb_info(fbidx);
1455         if (!info) {
1456                 request_module("fb%d", fbidx);
1457                 info = get_fb_info(fbidx);
1458                 if (!info)
1459                         return -ENODEV;
1460         }
1461         if (IS_ERR(info))
1462                 return PTR_ERR(info);
1463
1464         mutex_lock(&info->lock);
1465         if (!try_module_get(info->fbops->owner)) {
1466                 res = -ENODEV;
1467                 goto out;
1468         }
1469         file->private_data = info;
1470         if (info->fbops->fb_open) {
1471                 res = info->fbops->fb_open(info,1);
1472                 if (res)
1473                         module_put(info->fbops->owner);
1474         }
1475 #ifdef CONFIG_FB_DEFERRED_IO
1476         if (info->fbdefio)
1477                 fb_deferred_io_open(info, inode, file);
1478 #endif
1479 out:
1480         mutex_unlock(&info->lock);
1481         if (res)
1482                 put_fb_info(info);
1483         return res;
1484 }
1485
1486 static int
1487 fb_release(struct inode *inode, struct file *file)
1488 __acquires(&info->lock)
1489 __releases(&info->lock)
1490 {
1491         struct fb_info * const info = file->private_data;
1492
1493         mutex_lock(&info->lock);
1494         if (info->fbops->fb_release)
1495                 info->fbops->fb_release(info,1);
1496         module_put(info->fbops->owner);
1497         mutex_unlock(&info->lock);
1498         put_fb_info(info);
1499         return 0;
1500 }
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 #ifdef HAVE_ARCH_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 int do_register_framebuffer(struct fb_info *fb_info)
1619 {
1620         int i, ret;
1621         struct fb_event event;
1622         struct fb_videomode mode;
1623
1624         if (fb_check_foreignness(fb_info))
1625                 return -ENOSYS;
1626
1627         ret = do_remove_conflicting_framebuffers(fb_info->apertures,
1628                                                  fb_info->fix.id,
1629                                                  fb_is_primary_device(fb_info));
1630         if (ret)
1631                 return ret;
1632
1633         if (num_registered_fb == FB_MAX)
1634                 return -ENXIO;
1635
1636         num_registered_fb++;
1637         for (i = 0 ; i < FB_MAX; i++)
1638                 if (!registered_fb[i])
1639                         break;
1640         fb_info->node = i;
1641         atomic_set(&fb_info->count, 1);
1642         mutex_init(&fb_info->lock);
1643         mutex_init(&fb_info->mm_lock);
1644
1645         fb_info->dev = device_create(fb_class, fb_info->device,
1646                                      MKDEV(FB_MAJOR, i), NULL, "fb%d", i);
1647         if (IS_ERR(fb_info->dev)) {
1648                 /* Not fatal */
1649                 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1650                 fb_info->dev = NULL;
1651         } else
1652                 fb_init_device(fb_info);
1653
1654         if (fb_info->pixmap.addr == NULL) {
1655                 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1656                 if (fb_info->pixmap.addr) {
1657                         fb_info->pixmap.size = FBPIXMAPSIZE;
1658                         fb_info->pixmap.buf_align = 1;
1659                         fb_info->pixmap.scan_align = 1;
1660                         fb_info->pixmap.access_align = 32;
1661                         fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1662                 }
1663         }
1664         fb_info->pixmap.offset = 0;
1665
1666         if (!fb_info->pixmap.blit_x)
1667                 fb_info->pixmap.blit_x = ~(u32)0;
1668
1669         if (!fb_info->pixmap.blit_y)
1670                 fb_info->pixmap.blit_y = ~(u32)0;
1671
1672         if (!fb_info->modelist.prev || !fb_info->modelist.next)
1673                 INIT_LIST_HEAD(&fb_info->modelist);
1674
1675         if (fb_info->skip_vt_switch)
1676                 pm_vt_switch_required(fb_info->dev, false);
1677         else
1678                 pm_vt_switch_required(fb_info->dev, true);
1679
1680         fb_var_to_videomode(&mode, &fb_info->var);
1681         fb_add_videomode(&mode, &fb_info->modelist);
1682         registered_fb[i] = fb_info;
1683
1684         event.info = fb_info;
1685         console_lock();
1686         if (!lock_fb_info(fb_info)) {
1687                 console_unlock();
1688                 return -ENODEV;
1689         }
1690
1691         fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1692         unlock_fb_info(fb_info);
1693         console_unlock();
1694         return 0;
1695 }
1696
1697 static int unbind_console(struct fb_info *fb_info)
1698 {
1699         struct fb_event event;
1700         int ret;
1701         int i = fb_info->node;
1702
1703         if (i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)
1704                 return -EINVAL;
1705
1706         console_lock();
1707         if (!lock_fb_info(fb_info)) {
1708                 console_unlock();
1709                 return -ENODEV;
1710         }
1711
1712         event.info = fb_info;
1713         ret = fb_notifier_call_chain(FB_EVENT_FB_UNBIND, &event);
1714         unlock_fb_info(fb_info);
1715         console_unlock();
1716
1717         return ret;
1718 }
1719
1720 static int __unlink_framebuffer(struct fb_info *fb_info);
1721
1722 static int do_unregister_framebuffer(struct fb_info *fb_info)
1723 {
1724         struct fb_event event;
1725         int ret;
1726
1727         ret = unbind_console(fb_info);
1728
1729         if (ret)
1730                 return -EINVAL;
1731
1732         pm_vt_switch_unregister(fb_info->dev);
1733
1734         __unlink_framebuffer(fb_info);
1735         if (fb_info->pixmap.addr &&
1736             (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1737                 kfree(fb_info->pixmap.addr);
1738         fb_destroy_modelist(&fb_info->modelist);
1739         registered_fb[fb_info->node] = NULL;
1740         num_registered_fb--;
1741         fb_cleanup_device(fb_info);
1742         event.info = fb_info;
1743         console_lock();
1744         fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1745         console_unlock();
1746
1747         /* this may free fb info */
1748         put_fb_info(fb_info);
1749         return 0;
1750 }
1751
1752 static int __unlink_framebuffer(struct fb_info *fb_info)
1753 {
1754         int i;
1755
1756         i = fb_info->node;
1757         if (i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)
1758                 return -EINVAL;
1759
1760         if (fb_info->dev) {
1761                 device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1762                 fb_info->dev = NULL;
1763         }
1764
1765         return 0;
1766 }
1767
1768 int unlink_framebuffer(struct fb_info *fb_info)
1769 {
1770         int ret;
1771
1772         ret = __unlink_framebuffer(fb_info);
1773         if (ret)
1774                 return ret;
1775
1776         unbind_console(fb_info);
1777
1778         return 0;
1779 }
1780 EXPORT_SYMBOL(unlink_framebuffer);
1781
1782 int remove_conflicting_framebuffers(struct apertures_struct *a,
1783                                     const char *name, bool primary)
1784 {
1785         int ret;
1786
1787         mutex_lock(&registration_lock);
1788         ret = do_remove_conflicting_framebuffers(a, name, primary);
1789         mutex_unlock(&registration_lock);
1790
1791         return ret;
1792 }
1793 EXPORT_SYMBOL(remove_conflicting_framebuffers);
1794
1795 /**
1796  *      register_framebuffer - registers a frame buffer device
1797  *      @fb_info: frame buffer info structure
1798  *
1799  *      Registers a frame buffer device @fb_info.
1800  *
1801  *      Returns negative errno on error, or zero for success.
1802  *
1803  */
1804 int
1805 register_framebuffer(struct fb_info *fb_info)
1806 {
1807         int ret;
1808
1809         mutex_lock(&registration_lock);
1810         ret = do_register_framebuffer(fb_info);
1811         mutex_unlock(&registration_lock);
1812
1813         return ret;
1814 }
1815 EXPORT_SYMBOL(register_framebuffer);
1816
1817 /**
1818  *      unregister_framebuffer - releases a frame buffer device
1819  *      @fb_info: frame buffer info structure
1820  *
1821  *      Unregisters a frame buffer device @fb_info.
1822  *
1823  *      Returns negative errno on error, or zero for success.
1824  *
1825  *      This function will also notify the framebuffer console
1826  *      to release the driver.
1827  *
1828  *      This is meant to be called within a driver's module_exit()
1829  *      function. If this is called outside module_exit(), ensure
1830  *      that the driver implements fb_open() and fb_release() to
1831  *      check that no processes are using the device.
1832  */
1833 int
1834 unregister_framebuffer(struct fb_info *fb_info)
1835 {
1836         int ret;
1837
1838         mutex_lock(&registration_lock);
1839         ret = do_unregister_framebuffer(fb_info);
1840         mutex_unlock(&registration_lock);
1841
1842         return ret;
1843 }
1844 EXPORT_SYMBOL(unregister_framebuffer);
1845
1846 /**
1847  *      fb_set_suspend - low level driver signals suspend
1848  *      @info: framebuffer affected
1849  *      @state: 0 = resuming, !=0 = suspending
1850  *
1851  *      This is meant to be used by low level drivers to
1852  *      signal suspend/resume to the core & clients.
1853  *      It must be called with the console semaphore held
1854  */
1855 void fb_set_suspend(struct fb_info *info, int state)
1856 {
1857         struct fb_event event;
1858
1859         event.info = info;
1860         if (state) {
1861                 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event);
1862                 info->state = FBINFO_STATE_SUSPENDED;
1863         } else {
1864                 info->state = FBINFO_STATE_RUNNING;
1865                 fb_notifier_call_chain(FB_EVENT_RESUME, &event);
1866         }
1867 }
1868 EXPORT_SYMBOL(fb_set_suspend);
1869
1870 /**
1871  *      fbmem_init - init frame buffer subsystem
1872  *
1873  *      Initialize the frame buffer subsystem.
1874  *
1875  *      NOTE: This function is _only_ to be called by drivers/char/mem.c.
1876  *
1877  */
1878
1879 static int __init
1880 fbmem_init(void)
1881 {
1882         proc_create("fb", 0, NULL, &fb_proc_fops);
1883
1884         if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1885                 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1886
1887         fb_class = class_create(THIS_MODULE, "graphics");
1888         if (IS_ERR(fb_class)) {
1889                 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1890                 fb_class = NULL;
1891         }
1892         return 0;
1893 }
1894
1895 #ifdef MODULE
1896 module_init(fbmem_init);
1897 static void __exit
1898 fbmem_exit(void)
1899 {
1900         remove_proc_entry("fb", NULL);
1901         class_destroy(fb_class);
1902         unregister_chrdev(FB_MAJOR, "fb");
1903 }
1904
1905 module_exit(fbmem_exit);
1906 MODULE_LICENSE("GPL");
1907 MODULE_DESCRIPTION("Framebuffer base");
1908 #else
1909 subsys_initcall(fbmem_init);
1910 #endif
1911
1912 int fb_new_modelist(struct fb_info *info)
1913 {
1914         struct fb_event event;
1915         struct fb_var_screeninfo var = info->var;
1916         struct list_head *pos, *n;
1917         struct fb_modelist *modelist;
1918         struct fb_videomode *m, mode;
1919         int err = 1;
1920
1921         list_for_each_safe(pos, n, &info->modelist) {
1922                 modelist = list_entry(pos, struct fb_modelist, list);
1923                 m = &modelist->mode;
1924                 fb_videomode_to_var(&var, m);
1925                 var.activate = FB_ACTIVATE_TEST;
1926                 err = fb_set_var(info, &var);
1927                 fb_var_to_videomode(&mode, &var);
1928                 if (err || !fb_mode_is_equal(m, &mode)) {
1929                         list_del(pos);
1930                         kfree(pos);
1931                 }
1932         }
1933
1934         err = 1;
1935
1936         if (!list_empty(&info->modelist)) {
1937                 event.info = info;
1938                 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
1939         }
1940
1941         return err;
1942 }
1943
1944 MODULE_LICENSE("GPL");