drivers/video/fbmem.c

   1 /*
   2  *  linux/drivers/video/fbmem.c
   3  *
   4  *  Copyright (C) 1994 Martin Schaller
   5  *
   6  *      2001 - Documented with DocBook
   7  *      - Brad Douglas <brad@neruo.com>
   8  *
   9  * This file is subject to the terms and conditions of the GNU General Public
  10  * License.  See the file COPYING in the main directory of this archive
  11  * for more details.
  12  */
  13
  14 #include <linux/module.h>
  15
  16 #include <linux/compat.h>
  17 #include <linux/types.h>
  18 #include <linux/errno.h>
  19 #include <linux/kernel.h>
  20 #include <linux/major.h>
  21 #include <linux/slab.h>
  22 #include <linux/mm.h>
  23 #include <linux/mman.h>
  24 #include <linux/vt.h>
  25 #include <linux/init.h>
  26 #include <linux/linux_logo.h>
  27 #include <linux/proc_fs.h>
  28 #include <linux/seq_file.h>
  29 #include <linux/console.h>
  30 #include <linux/kmod.h>
  31 #include <linux/err.h>
  32 #include <linux/device.h>
  33 #include <linux/efi.h>
  34 #include <linux/fb.h>
  35
  36 #include <asm/fb.h>
  37
  38
  39     /*
  40      *  Frame buffer device initialization and setup routines
  41      */
  42
  43 #define FBPIXMAPSIZE    (1024 * 8)
  44
  45 static DEFINE_MUTEX(registration_lock);
  46 struct fb_info *registered_fb[FB_MAX] __read_mostly;
  47 int num_registered_fb __read_mostly;
  48
  49 static struct fb_info *get_fb_info(unsigned int idx)
  50 {
  51         struct fb_info *fb_info;
  52
  53         if (idx >= FB_MAX)
  54                 return ERR_PTR(-ENODEV);
  55
  56         mutex_lock(&registration_lock);
  57         fb_info = registered_fb[idx];
  58         if (fb_info)
  59                 atomic_inc(&fb_info->count);
  60         mutex_unlock(&registration_lock);
  61
  62         return fb_info;
  63 }
  64
  65 static void put_fb_info(struct fb_info *fb_info)
  66 {
  67         if (!atomic_dec_and_test(&fb_info->count))
  68                 return;
  69         if (fb_info->fbops->fb_destroy)
  70                 fb_info->fbops->fb_destroy(fb_info);
  71 }
  72
  73 int lock_fb_info(struct fb_info *info)
  74 {
  75         mutex_lock(&info->lock);
  76         if (!info->fbops) {
  77                 mutex_unlock(&info->lock);
  78                 return 0;
  79         }
  80         return 1;
  81 }
  82 EXPORT_SYMBOL(lock_fb_info);
  83
  84 /*
  85  * Helpers
  86  */
  87
  88 int fb_get_color_depth(struct fb_var_screeninfo *var,
  89                        struct fb_fix_screeninfo *fix)
  90 {
  91         int depth = 0;
  92
  93         if (fix->visual == FB_VISUAL_MONO01 ||
  94             fix->visual == FB_VISUAL_MONO10)
  95                 depth = 1;
  96         else {
  97                 if (var->green.length == var->blue.length &&
  98                     var->green.length == var->red.length &&
  99                     var->green.offset == var->blue.offset &&
 100                     var->green.offset == var->red.offset)
 101                         depth = var->green.length;
 102                 else
 103                         depth = var->green.length + var->red.length +
 104                                 var->blue.length;
 105         }
 106
 107         return depth;
 108 }
 109 EXPORT_SYMBOL(fb_get_color_depth);
 110
 111 /*
 112  * Data padding functions.
 113  */
 114 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
 115 {
 116         __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
 117 }
 118 EXPORT_SYMBOL(fb_pad_aligned_buffer);
 119
 120 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
 121                                 u32 shift_high, u32 shift_low, u32 mod)
 122 {
 123         u8 mask = (u8) (0xfff << shift_high), tmp;
 124         int i, j;
 125
 126         for (i = height; i--; ) {
 127                 for (j = 0; j < idx; j++) {
 128                         tmp = dst[j];
 129                         tmp &= mask;
 130                         tmp |= *src >> shift_low;
 131                         dst[j] = tmp;
 132                         tmp = *src << shift_high;
 133                         dst[j+1] = tmp;
 134                         src++;
 135                 }
 136                 tmp = dst[idx];
 137                 tmp &= mask;
 138                 tmp |= *src >> shift_low;
 139                 dst[idx] = tmp;
 140                 if (shift_high < mod) {
 141                         tmp = *src << shift_high;
 142                         dst[idx+1] = tmp;
 143                 }
 144                 src++;
 145                 dst += d_pitch;
 146         }
 147 }
 148 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
 149
 150 /*
 151  * we need to lock this section since fb_cursor
 152  * may use fb_imageblit()
 153  */
 154 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
 155 {
 156         u32 align = buf->buf_align - 1, offset;
 157         char *addr = buf->addr;
 158
 159         /* If IO mapped, we need to sync before access, no sharing of
 160          * the pixmap is done
 161          */
 162         if (buf->flags & FB_PIXMAP_IO) {
 163                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 164                         info->fbops->fb_sync(info);
 165                 return addr;
 166         }
 167
 168         /* See if we fit in the remaining pixmap space */
 169         offset = buf->offset + align;
 170         offset &= ~align;
 171         if (offset + size > buf->size) {
 172                 /* We do not fit. In order to be able to re-use the buffer,
 173                  * we must ensure no asynchronous DMA'ing or whatever operation
 174                  * is in progress, we sync for that.
 175                  */
 176                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 177                         info->fbops->fb_sync(info);
 178                 offset = 0;
 179         }
 180         buf->offset = offset + size;
 181         addr += offset;
 182
 183         return addr;
 184 }
 185
 186 #ifdef CONFIG_LOGO
 187
 188 static inline unsigned safe_shift(unsigned d, int n)
 189 {
 190         return n < 0 ? d >> -n : d << n;
 191 }
 192
 193 static void fb_set_logocmap(struct fb_info *info,
 194                                    const struct linux_logo *logo)
 195 {
 196         struct fb_cmap palette_cmap;
 197         u16 palette_green[16];
 198         u16 palette_blue[16];
 199         u16 palette_red[16];
 200         int i, j, n;
 201         const unsigned char *clut = logo->clut;
 202
 203         palette_cmap.start = 0;
 204         palette_cmap.len = 16;
 205         palette_cmap.red = palette_red;
 206         palette_cmap.green = palette_green;
 207         palette_cmap.blue = palette_blue;
 208         palette_cmap.transp = NULL;
 209
 210         for (i = 0; i < logo->clutsize; i += n) {
 211                 n = logo->clutsize - i;
 212                 /* palette_cmap provides space for only 16 colors at once */
 213                 if (n > 16)
 214                         n = 16;
 215                 palette_cmap.start = 32 + i;
 216                 palette_cmap.len = n;
 217                 for (j = 0; j < n; ++j) {
 218                         palette_cmap.red[j] = clut[0] << 8 | clut[0];
 219                         palette_cmap.green[j] = clut[1] << 8 | clut[1];
 220                         palette_cmap.blue[j] = clut[2] << 8 | clut[2];
 221                         clut += 3;
 222                 }
 223                 fb_set_cmap(&palette_cmap, info);
 224         }
 225 }
 226
 227 static void  fb_set_logo_truepalette(struct fb_info *info,
 228                                             const struct linux_logo *logo,
 229                                             u32 *palette)
 230 {
 231         static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
 232         unsigned char redmask, greenmask, bluemask;
 233         int redshift, greenshift, blueshift;
 234         int i;
 235         const unsigned char *clut = logo->clut;
 236
 237         /*
 238          * We have to create a temporary palette since console palette is only
 239          * 16 colors long.
 240          */
 241         /* Bug: Doesn't obey msb_right ... (who needs that?) */
 242         redmask   = mask[info->var.red.length   < 8 ? info->var.red.length   : 8];
 243         greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
 244         bluemask  = mask[info->var.blue.length  < 8 ? info->var.blue.length  : 8];
 245         redshift   = info->var.red.offset   - (8 - info->var.red.length);
 246         greenshift = info->var.green.offset - (8 - info->var.green.length);
 247         blueshift  = info->var.blue.offset  - (8 - info->var.blue.length);
 248
 249         for ( i = 0; i < logo->clutsize; i++) {
 250                 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
 251                                  safe_shift((clut[1] & greenmask), greenshift) |
 252                                  safe_shift((clut[2] & bluemask), blueshift));
 253                 clut += 3;
 254         }
 255 }
 256
 257 static void fb_set_logo_directpalette(struct fb_info *info,
 258                                              const struct linux_logo *logo,
 259                                              u32 *palette)
 260 {
 261         int redshift, greenshift, blueshift;
 262         int i;
 263
 264         redshift = info->var.red.offset;
 265         greenshift = info->var.green.offset;
 266         blueshift = info->var.blue.offset;
 267
 268         for (i = 32; i < 32 + logo->clutsize; i++)
 269                 palette[i] = i << redshift | i << greenshift | i << blueshift;
 270 }
 271
 272 static void fb_set_logo(struct fb_info *info,
 273                                const struct linux_logo *logo, u8 *dst,
 274                                int depth)
 275 {
 276         int i, j, k;
 277         const u8 *src = logo->data;
 278         u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
 279         u8 fg = 1, d;
 280
 281         switch (fb_get_color_depth(&info->var, &info->fix)) {
 282         case 1:
 283                 fg = 1;
 284                 break;
 285         case 2:
 286                 fg = 3;
 287                 break;
 288         default:
 289                 fg = 7;
 290                 break;
 291         }
 292
 293         if (info->fix.visual == FB_VISUAL_MONO01 ||
 294             info->fix.visual == FB_VISUAL_MONO10)
 295                 fg = ~((u8) (0xfff << info->var.green.length));
 296
 297         switch (depth) {
 298         case 4:
 299                 for (i = 0; i < logo->height; i++)
 300                         for (j = 0; j < logo->width; src++) {
 301                                 *dst++ = *src >> 4;
 302                                 j++;
 303                                 if (j < logo->width) {
 304                                         *dst++ = *src & 0x0f;
 305                                         j++;
 306                                 }
 307                         }
 308                 break;
 309         case 1:
 310                 for (i = 0; i < logo->height; i++) {
 311                         for (j = 0; j < logo->width; src++) {
 312                                 d = *src ^ xor;
 313                                 for (k = 7; k >= 0; k--) {
 314                                         *dst++ = ((d >> k) & 1) ? fg : 0;
 315                                         j++;
 316                                 }
 317                         }
 318                 }
 319                 break;
 320         }
 321 }
 322
 323 /*
 324  * Three (3) kinds of logo maps exist.  linux_logo_clut224 (>16 colors),
 325  * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors).  Depending on
 326  * the visual format and color depth of the framebuffer, the DAC, the
 327  * pseudo_palette, and the logo data will be adjusted accordingly.
 328  *
 329  * Case 1 - linux_logo_clut224:
 330  * Color exceeds the number of console colors (16), thus we set the hardware DAC
 331  * using fb_set_cmap() appropriately.  The "needs_cmapreset"  flag will be set.
 332  *
 333  * For visuals that require color info from the pseudo_palette, we also construct
 334  * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
 335  * will be set.
 336  *
 337  * Case 2 - linux_logo_vga16:
 338  * The number of colors just matches the console colors, thus there is no need
 339  * to set the DAC or the pseudo_palette.  However, the bitmap is packed, ie,
 340  * each byte contains color information for two pixels (upper and lower nibble).
 341  * To be consistent with fb_imageblit() usage, we therefore separate the two
 342  * nibbles into separate bytes. The "depth" flag will be set to 4.
 343  *
 344  * Case 3 - linux_logo_mono:
 345  * This is similar with Case 2.  Each byte contains information for 8 pixels.
 346  * We isolate each bit and expand each into a byte. The "depth" flag will
 347  * be set to 1.
 348  */
 349 static struct logo_data {
 350         int depth;
 351         int needs_directpalette;
 352         int needs_truepalette;
 353         int needs_cmapreset;
 354         const struct linux_logo *logo;
 355 } fb_logo __read_mostly;
 356
 357 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
 358 {
 359         u32 size = width * height, i;
 360
 361         out += size - 1;
 362
 363         for (i = size; i--; )
 364                 *out-- = *in++;
 365 }
 366
 367 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
 368 {
 369         int i, j, h = height - 1;
 370
 371         for (i = 0; i < height; i++)
 372                 for (j = 0; j < width; j++)
 373                                 out[height * j + h - i] = *in++;
 374 }
 375
 376 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
 377 {
 378         int i, j, w = width - 1;
 379
 380         for (i = 0; i < height; i++)
 381                 for (j = 0; j < width; j++)
 382                         out[height * (w - j) + i] = *in++;
 383 }
 384
 385 static void fb_rotate_logo(struct fb_info *info, u8 *dst,
 386                            struct fb_image *image, int rotate)
 387 {
 388         u32 tmp;
 389
 390         if (rotate == FB_ROTATE_UD) {
 391                 fb_rotate_logo_ud(image->data, dst, image->width,
 392                                   image->height);
 393                 image->dx = info->var.xres - image->width - image->dx;
 394                 image->dy = info->var.yres - image->height - image->dy;
 395         } else if (rotate == FB_ROTATE_CW) {
 396                 fb_rotate_logo_cw(image->data, dst, image->width,
 397                                   image->height);
 398                 tmp = image->width;
 399                 image->width = image->height;
 400                 image->height = tmp;
 401                 tmp = image->dy;
 402                 image->dy = image->dx;
 403                 image->dx = info->var.xres - image->width - tmp;
 404         } else if (rotate == FB_ROTATE_CCW) {
 405                 fb_rotate_logo_ccw(image->data, dst, image->width,
 406                                    image->height);
 407                 tmp = image->width;
 408                 image->width = image->height;
 409                 image->height = tmp;
 410                 tmp = image->dx;
 411                 image->dx = image->dy;
 412                 image->dy = info->var.yres - image->height - tmp;
 413         }
 414
 415         image->data = dst;
 416 }
 417
 418 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
 419                             int rotate, unsigned int num)
 420 {
 421         unsigned int x;
 422
 423         if (rotate == FB_ROTATE_UR) {
 424                 for (x = 0;
 425                      x < num && image->dx + image->width <= info->var.xres;
 426                      x++) {
 427                         info->fbops->fb_imageblit(info, image);
 428                         image->dx += image->width + 8;
 429                 }
 430         } else if (rotate == FB_ROTATE_UD) {
 431                 for (x = 0; x < num && image->dx >= 0; x++) {
 432                         info->fbops->fb_imageblit(info, image);
 433                         image->dx -= image->width + 8;
 434                 }
 435         } else if (rotate == FB_ROTATE_CW) {
 436                 for (x = 0;
 437                      x < num && image->dy + image->height <= info->var.yres;
 438                      x++) {
 439                         info->fbops->fb_imageblit(info, image);
 440                         image->dy += image->height + 8;
 441                 }
 442         } else if (rotate == FB_ROTATE_CCW) {
 443                 for (x = 0; x < num && image->dy >= 0; x++) {
 444                         info->fbops->fb_imageblit(info, image);
 445                         image->dy -= image->height + 8;
 446                 }
 447         }
 448 }
 449
 450 static int fb_show_logo_line(struct fb_info *info, int rotate,
 451                              const struct linux_logo *logo, int y,
 452                              unsigned int n)
 453 {
 454         u32 *palette = NULL, *saved_pseudo_palette = NULL;
 455         unsigned char *logo_new = NULL, *logo_rotate = NULL;
 456         struct fb_image image;
 457
 458         /* Return if the frame buffer is not mapped or suspended */
 459         if (logo == NULL || info->state != FBINFO_STATE_RUNNING ||
 460             info->flags & FBINFO_MODULE)
 461                 return 0;
 462
 463         image.depth = 8;
 464         image.data = logo->data;
 465
 466         if (fb_logo.needs_cmapreset)
 467                 fb_set_logocmap(info, logo);
 468
 469         if (fb_logo.needs_truepalette ||
 470             fb_logo.needs_directpalette) {
 471                 palette = kmalloc(256 * 4, GFP_KERNEL);
 472                 if (palette == NULL)
 473                         return 0;
 474
 475                 if (fb_logo.needs_truepalette)
 476                         fb_set_logo_truepalette(info, logo, palette);
 477                 else
 478                         fb_set_logo_directpalette(info, logo, palette);
 479
 480                 saved_pseudo_palette = info->pseudo_palette;
 481                 info->pseudo_palette = palette;
 482         }
 483
 484         if (fb_logo.depth <= 4) {
 485                 logo_new = kmalloc(logo->width * logo->height, GFP_KERNEL);
 486                 if (logo_new == NULL) {
 487                         kfree(palette);
 488                         if (saved_pseudo_palette)
 489                                 info->pseudo_palette = saved_pseudo_palette;
 490                         return 0;
 491                 }
 492                 image.data = logo_new;
 493                 fb_set_logo(info, logo, logo_new, fb_logo.depth);
 494         }
 495
 496         image.dx = 0;
 497         image.dy = y;
 498         image.width = logo->width;
 499         image.height = logo->height;
 500
 501         if (rotate) {
 502                 logo_rotate = kmalloc(logo->width *
 503                                       logo->height, GFP_KERNEL);
 504                 if (logo_rotate)
 505                         fb_rotate_logo(info, logo_rotate, &image, rotate);
 506         }
 507
 508         fb_do_show_logo(info, &image, rotate, n);
 509
 510         kfree(palette);
 511         if (saved_pseudo_palette != NULL)
 512                 info->pseudo_palette = saved_pseudo_palette;
 513         kfree(logo_new);
 514         kfree(logo_rotate);
 515         return logo->height;
 516 }
 517
 518
 519 #ifdef CONFIG_FB_LOGO_EXTRA
 520
 521 #define FB_LOGO_EX_NUM_MAX 10
 522 static struct logo_data_extra {
 523         const struct linux_logo *logo;
 524         unsigned int n;
 525 } fb_logo_ex[FB_LOGO_EX_NUM_MAX];
 526 static unsigned int fb_logo_ex_num;
 527
 528 void fb_append_extra_logo(const struct linux_logo *logo, unsigned int n)
 529 {
 530         if (!n || fb_logo_ex_num == FB_LOGO_EX_NUM_MAX)
 531                 return;
 532
 533         fb_logo_ex[fb_logo_ex_num].logo = logo;
 534         fb_logo_ex[fb_logo_ex_num].n = n;
 535         fb_logo_ex_num++;
 536 }
 537
 538 static int fb_prepare_extra_logos(struct fb_info *info, unsigned int height,
 539                                   unsigned int yres)
 540 {
 541         unsigned int i;
 542
 543         /* FIXME: logo_ex supports only truecolor fb. */
 544         if (info->fix.visual != FB_VISUAL_TRUECOLOR)
 545                 fb_logo_ex_num = 0;
 546
 547         for (i = 0; i < fb_logo_ex_num; i++) {
 548                 if (fb_logo_ex[i].logo->type != fb_logo.logo->type) {
 549                         fb_logo_ex[i].logo = NULL;
 550                         continue;
 551                 }
 552                 height += fb_logo_ex[i].logo->height;
 553                 if (height > yres) {
 554                         height -= fb_logo_ex[i].logo->height;
 555                         fb_logo_ex_num = i;
 556                         break;
 557                 }
 558         }
 559         return height;
 560 }
 561
 562 static int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
 563 {
 564         unsigned int i;
 565
 566         for (i = 0; i < fb_logo_ex_num; i++)
 567                 y += fb_show_logo_line(info, rotate,
 568                                        fb_logo_ex[i].logo, y, fb_logo_ex[i].n);
 569
 570         return y;
 571 }
 572
 573 #else /* !CONFIG_FB_LOGO_EXTRA */
 574
 575 static inline int fb_prepare_extra_logos(struct fb_info *info,
 576                                          unsigned int height,
 577                                          unsigned int yres)
 578 {
 579         return height;
 580 }
 581
 582 static inline int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
 583 {
 584         return y;
 585 }
 586
 587 #endif /* CONFIG_FB_LOGO_EXTRA */
 588
 589
 590 int fb_prepare_logo(struct fb_info *info, int rotate)
 591 {
 592         int depth = fb_get_color_depth(&info->var, &info->fix);
 593         unsigned int yres;
 594
 595         memset(&fb_logo, 0, sizeof(struct logo_data));
 596
 597         if (info->flags & FBINFO_MISC_TILEBLITTING ||
 598             info->flags & FBINFO_MODULE)
 599                 return 0;
 600
 601         if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
 602                 depth = info->var.blue.length;
 603                 if (info->var.red.length < depth)
 604                         depth = info->var.red.length;
 605                 if (info->var.green.length < depth)
 606                         depth = info->var.green.length;
 607         }
 608
 609         if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) {
 610                 /* assume console colormap */
 611                 depth = 4;
 612         }
 613
 614         /* Return if no suitable logo was found */
 615         fb_logo.logo = fb_find_logo(depth);
 616
 617         if (!fb_logo.logo) {
 618                 return 0;
 619         }
 620
 621         if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
 622                 yres = info->var.yres;
 623         else
 624                 yres = info->var.xres;
 625
 626         if (fb_logo.logo->height > yres) {
 627                 fb_logo.logo = NULL;
 628                 return 0;
 629         }
 630
 631         /* What depth we asked for might be different from what we get */
 632         if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
 633                 fb_logo.depth = 8;
 634         else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
 635                 fb_logo.depth = 4;
 636         else
 637                 fb_logo.depth = 1;
 638
 639
 640         if (fb_logo.depth > 4 && depth > 4) {
 641                 switch (info->fix.visual) {
 642                 case FB_VISUAL_TRUECOLOR:
 643                         fb_logo.needs_truepalette = 1;
 644                         break;
 645                 case FB_VISUAL_DIRECTCOLOR:
 646                         fb_logo.needs_directpalette = 1;
 647                         fb_logo.needs_cmapreset = 1;
 648                         break;
 649                 case FB_VISUAL_PSEUDOCOLOR:
 650                         fb_logo.needs_cmapreset = 1;
 651                         break;
 652                 }
 653         }
 654
 655         return fb_prepare_extra_logos(info, fb_logo.logo->height, yres);
 656 }
 657
 658 int fb_show_logo(struct fb_info *info, int rotate)
 659 {
 660         int y;
 661
 662         y = fb_show_logo_line(info, rotate, fb_logo.logo, 0,
 663                               num_online_cpus());
 664         y = fb_show_extra_logos(info, y, rotate);
 665
 666         return y;
 667 }
 668 #else
 669 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
 670 int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
 671 #endif /* CONFIG_LOGO */
 672
 673 static void *fb_seq_start(struct seq_file *m, loff_t *pos)
 674 {
 675         mutex_lock(&registration_lock);
 676         return (*pos < FB_MAX) ? pos : NULL;
 677 }
 678
 679 static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos)
 680 {
 681         (*pos)++;
 682         return (*pos < FB_MAX) ? pos : NULL;
 683 }
 684
 685 static void fb_seq_stop(struct seq_file *m, void *v)
 686 {
 687         mutex_unlock(&registration_lock);
 688 }
 689
 690 static int fb_seq_show(struct seq_file *m, void *v)
 691 {
 692         int i = *(loff_t *)v;
 693         struct fb_info *fi = registered_fb[i];
 694
 695         if (fi)
 696                 seq_printf(m, "%d %s\n", fi->node, fi->fix.id);
 697         return 0;
 698 }
 699
 700 static const struct seq_operations proc_fb_seq_ops = {
 701         .start  = fb_seq_start,
 702         .next   = fb_seq_next,
 703         .stop   = fb_seq_stop,
 704         .show   = fb_seq_show,
 705 };
 706
 707 static int proc_fb_open(struct inode *inode, struct file *file)
 708 {
 709         return seq_open(file, &proc_fb_seq_ops);
 710 }
 711
 712 static const struct file_operations fb_proc_fops = {
 713         .owner          = THIS_MODULE,
 714         .open           = proc_fb_open,
 715         .read           = seq_read,
 716         .llseek         = seq_lseek,
 717         .release        = seq_release,
 718 };
 719
 720 /*
 721  * We hold a reference to the fb_info in file->private_data,
 722  * but if the current registered fb has changed, we don't
 723  * actually want to use it.
 724  *
 725  * So look up the fb_info using the inode minor number,
 726  * and just verify it against the reference we have.
 727  */
 728 static struct fb_info *file_fb_info(struct file *file)
 729 {
 730         struct inode *inode = file_inode(file);
 731         int fbidx = iminor(inode);
 732         struct fb_info *info = registered_fb[fbidx];
 733
 734         if (info != file->private_data)
 735                 info = NULL;
 736         return info;
 737 }
 738
 739 static ssize_t
 740 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 741 {
 742         unsigned long p = *ppos;
 743         struct fb_info *info = file_fb_info(file);
 744         u8 *buffer, *dst;
 745         u8 __iomem *src;
 746         int c, cnt = 0, err = 0;
 747         unsigned long total_size;
 748
 749         if (!info || ! info->screen_base)
 750                 return -ENODEV;
 751
 752         if (info->state != FBINFO_STATE_RUNNING)
 753                 return -EPERM;
 754
 755         if (info->fbops->fb_read)
 756                 return info->fbops->fb_read(info, buf, count, ppos);
 757
 758         total_size = info->screen_size;
 759
 760         if (total_size == 0)
 761                 total_size = info->fix.smem_len;
 762
 763         if (p >= total_size)
 764                 return 0;
 765
 766         if (count >= total_size)
 767                 count = total_size;
 768
 769         if (count + p > total_size)
 770                 count = total_size - p;
 771
 772         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 773                          GFP_KERNEL);
 774         if (!buffer)
 775                 return -ENOMEM;
 776
 777         src = (u8 __iomem *) (info->screen_base + p);
 778
 779         if (info->fbops->fb_sync)
 780                 info->fbops->fb_sync(info);
 781
 782         while (count) {
 783                 c  = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 784                 dst = buffer;
 785                 fb_memcpy_fromfb(dst, src, c);
 786                 dst += c;
 787                 src += c;
 788
 789                 if (copy_to_user(buf, buffer, c)) {
 790                         err = -EFAULT;
 791                         break;
 792                 }
 793                 *ppos += c;
 794                 buf += c;
 795                 cnt += c;
 796                 count -= c;
 797         }
 798
 799         kfree(buffer);
 800
 801         return (err) ? err : cnt;
 802 }
 803
 804 static ssize_t
 805 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 806 {
 807         unsigned long p = *ppos;
 808         struct fb_info *info = file_fb_info(file);
 809         u8 *buffer, *src;
 810         u8 __iomem *dst;
 811         int c, cnt = 0, err = 0;
 812         unsigned long total_size;
 813
 814         if (!info || !info->screen_base)
 815                 return -ENODEV;
 816
 817         if (info->state != FBINFO_STATE_RUNNING)
 818                 return -EPERM;
 819
 820         if (info->fbops->fb_write)
 821                 return info->fbops->fb_write(info, buf, count, ppos);
 822
 823         total_size = info->screen_size;
 824
 825         if (total_size == 0)
 826                 total_size = info->fix.smem_len;
 827
 828         if (p > total_size)
 829                 return -EFBIG;
 830
 831         if (count > total_size) {
 832                 err = -EFBIG;
 833                 count = total_size;
 834         }
 835
 836         if (count + p > total_size) {
 837                 if (!err)
 838                         err = -ENOSPC;
 839
 840                 count = total_size - p;
 841         }
 842
 843         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 844                          GFP_KERNEL);
 845         if (!buffer)
 846                 return -ENOMEM;
 847
 848         dst = (u8 __iomem *) (info->screen_base + p);
 849
 850         if (info->fbops->fb_sync)
 851                 info->fbops->fb_sync(info);
 852
 853         while (count) {
 854                 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 855                 src = buffer;
 856
 857                 if (copy_from_user(src, buf, c)) {
 858                         err = -EFAULT;
 859                         break;
 860                 }
 861
 862                 fb_memcpy_tofb(dst, src, c);
 863                 dst += c;
 864                 src += c;
 865                 *ppos += c;
 866                 buf += c;
 867                 cnt += c;
 868                 count -= c;
 869         }
 870
 871         kfree(buffer);
 872
 873         return (cnt) ? cnt : err;
 874 }
 875
 876 int
 877 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
 878 {
 879         struct fb_fix_screeninfo *fix = &info->fix;
 880         unsigned int yres = info->var.yres;
 881         int err = 0;
 882
 883         if (var->yoffset > 0) {
 884                 if (var->vmode & FB_VMODE_YWRAP) {
 885                         if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
 886                                 err = -EINVAL;
 887                         else
 888                                 yres = 0;
 889                 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
 890                         err = -EINVAL;
 891         }
 892
 893         if (var->xoffset > 0 && (!fix->xpanstep ||
 894                                  (var->xoffset % fix->xpanstep)))
 895                 err = -EINVAL;
 896
 897         if (err || !info->fbops->fb_pan_display ||
 898             var->yoffset > info->var.yres_virtual - yres ||
 899             var->xoffset > info->var.xres_virtual - info->var.xres)
 900                 return -EINVAL;
 901
 902         if ((err = info->fbops->fb_pan_display(var, info)))
 903                 return err;
 904         info->var.xoffset = var->xoffset;
 905         info->var.yoffset = var->yoffset;
 906         if (var->vmode & FB_VMODE_YWRAP)
 907                 info->var.vmode |= FB_VMODE_YWRAP;
 908         else
 909                 info->var.vmode &= ~FB_VMODE_YWRAP;
 910         return 0;
 911 }
 912
 913 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var,
 914                          u32 activate)
 915 {
 916         struct fb_event event;
 917         struct fb_blit_caps caps, fbcaps;
 918         int err = 0;
 919
 920         memset(&caps, 0, sizeof(caps));
 921         memset(&fbcaps, 0, sizeof(fbcaps));
 922         caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0;
 923         event.info = info;
 924         event.data = &caps;
 925         fb_notifier_call_chain(FB_EVENT_GET_REQ, &event);
 926         info->fbops->fb_get_caps(info, &fbcaps, var);
 927
 928         if (((fbcaps.x ^ caps.x) & caps.x) ||
 929             ((fbcaps.y ^ caps.y) & caps.y) ||
 930             (fbcaps.len < caps.len))
 931                 err = -EINVAL;
 932
 933         return err;
 934 }
 935
 936 int
 937 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
 938 {
 939         int flags = info->flags;
 940         int ret = 0;
 941
 942         if (var->activate & FB_ACTIVATE_INV_MODE) {
 943                 struct fb_videomode mode1, mode2;
 944
 945                 fb_var_to_videomode(&mode1, var);
 946                 fb_var_to_videomode(&mode2, &info->var);
 947                 /* make sure we don't delete the videomode of current var */
 948                 ret = fb_mode_is_equal(&mode1, &mode2);
 949
 950                 if (!ret) {
 951                     struct fb_event event;
 952
 953                     event.info = info;
 954                     event.data = &mode1;
 955                     ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event);
 956                 }
 957
 958                 if (!ret)
 959                     fb_delete_videomode(&mode1, &info->modelist);
 960
 961
 962                 ret = (ret) ? -EINVAL : 0;
 963                 goto done;
 964         }
 965
 966         if ((var->activate & FB_ACTIVATE_FORCE) ||
 967             memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
 968                 u32 activate = var->activate;
 969
 970                 /* When using FOURCC mode, make sure the red, green, blue and
 971                  * transp fields are set to 0.
 972                  */
 973                 if ((info->fix.capabilities & FB_CAP_FOURCC) &&
 974                     var->grayscale > 1) {
 975                         if (var->red.offset     || var->green.offset    ||
 976                             var->blue.offset    || var->transp.offset   ||
 977                             var->red.length     || var->green.length    ||
 978                             var->blue.length    || var->transp.length   ||
 979                             var->red.msb_right  || var->green.msb_right ||
 980                             var->blue.msb_right || var->transp.msb_right)
 981                                 return -EINVAL;
 982                 }
 983
 984                 if (!info->fbops->fb_check_var) {
 985                         *var = info->var;
 986                         goto done;
 987                 }
 988
 989                 ret = info->fbops->fb_check_var(var, info);
 990
 991                 if (ret)
 992                         goto done;
 993
 994                 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW
 995                         || (var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NODISP) {
 996                         struct fb_var_screeninfo old_var;
 997                         struct fb_videomode mode;
 998
 999                         if (info->fbops->fb_get_caps) {
1000                                 ret = fb_check_caps(info, var, activate);
1001
1002                                 if (ret)
1003                                         goto done;
1004                         }
1005
1006                         old_var = info->var;
1007                         info->var = *var;
1008
1009                         if (info->fbops->fb_set_par) {
1010                                 ret = info->fbops->fb_set_par(info);
1011
1012                                 if (ret) {
1013                                         info->var = old_var;
1014                                         printk(KERN_WARNING "detected "
1015                                                 "fb_set_par error, "
1016                                                 "error code: %d\n", ret);
1017                                         goto done;
1018                                 }
1019                         }
1020
1021                         if((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
1022                                 fb_pan_display(info, &info->var);
1023                         }
1024
1025                         fb_set_cmap(&info->cmap, info);
1026                         fb_var_to_videomode(&mode, &info->var);
1027
1028                         if (info->modelist.prev && info->modelist.next &&
1029                             !list_empty(&info->modelist))
1030                                 ret = fb_add_videomode(&mode, &info->modelist);
1031
1032                         if (!ret && (flags & FBINFO_MISC_USEREVENT)) {
1033                                 struct fb_event event;
1034                                 int evnt = (activate & FB_ACTIVATE_ALL) ?
1035                                         FB_EVENT_MODE_CHANGE_ALL :
1036                                         FB_EVENT_MODE_CHANGE;
1037
1038                                 info->flags &= ~FBINFO_MISC_USEREVENT;
1039                                 event.info = info;
1040                                 event.data = &mode;
1041                                 fb_notifier_call_chain(evnt, &event);
1042                         }
1043                 }
1044         }
1045
1046  done:
1047         return ret;
1048 }
1049
1050 int
1051 fb_blank(struct fb_info *info, int blank)
1052 {
1053         struct fb_event event;
1054         int ret = -EINVAL, early_ret;
1055
1056         if (blank > FB_BLANK_POWERDOWN)
1057                 blank = FB_BLANK_POWERDOWN;
1058
1059         event.info = info;
1060         event.data = &blank;
1061
1062         early_ret = fb_notifier_call_chain(FB_EARLY_EVENT_BLANK, &event);
1063
1064         if (info->fbops->fb_blank)
1065                 ret = info->fbops->fb_blank(blank, info);
1066
1067         if (!ret)
1068                 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
1069         else {
1070                 /*
1071                  * if fb_blank is failed then revert effects of
1072                  * the early blank event.
1073                  */
1074                 if (!early_ret)
1075                         fb_notifier_call_chain(FB_R_EARLY_EVENT_BLANK, &event);
1076         }
1077
1078         return ret;
1079 }
1080
1081 static long do_fb_ioctl(struct fb_info *info, unsigned int cmd,
1082                         unsigned long arg)
1083 {
1084         struct fb_ops *fb;
1085         struct fb_var_screeninfo var;
1086         struct fb_fix_screeninfo fix;
1087         struct fb_con2fbmap con2fb;
1088         struct fb_cmap cmap_from;
1089         struct fb_cmap_user cmap;
1090         struct fb_event event;
1091         void __user *argp = (void __user *)arg;
1092         long ret = 0;
1093
1094         switch (cmd) {
1095         case FBIOGET_VSCREENINFO:
1096                 if (!lock_fb_info(info))
1097                         return -ENODEV;
1098                 var = info->var;
1099                 pr_info("FBIOGET_VSCREENINFO:res[%d %d]virt[%d %d]off[%d %d]wh[%d %d]\n",
1100                         var.xres, var.yres, var.xres_virtual, var.yres_virtual,
1101                         var.xoffset, var.yoffset, var.width, var.height);
1102                 unlock_fb_info(info);
1103                 ret = copy_to_user(argp, &var, sizeof(var)) ? -EFAULT : 0;
1104                 break;
1105         case FBIOPUT_VSCREENINFO:
1106                 if (copy_from_user(&var, argp, sizeof(var)))
1107                         return -EFAULT;
1108                 if (!lock_fb_info(info))
1109                         return -ENODEV;
1110                 pr_info("FBIOPUT_VSCREENINFO:res[%d %d]virt[%d %d]off[%d %d]wh[%d %d]\n",
1111                         var.xres, var.yres, var.xres_virtual, var.yres_virtual,
1112                         var.xoffset, var.yoffset, var.width, var.height);
1113                 console_lock();
1114                 info->flags |= FBINFO_MISC_USEREVENT;
1115                 ret = fb_set_var(info, &var);
1116                 info->flags &= ~FBINFO_MISC_USEREVENT;
1117                 console_unlock();
1118                 unlock_fb_info(info);
1119                 if (!ret && copy_to_user(argp, &var, sizeof(var)))
1120                         ret = -EFAULT;
1121                 break;
1122         case FBIOGET_FSCREENINFO:
1123                 if (!lock_fb_info(info))
1124                         return -ENODEV;
1125                 fix = info->fix;
1126                 pr_info("FBIOGET_FSCREENINFO:smem[0x%x %d]line[%d]\n",
1127                         (int)fix.smem_start, fix.smem_len, fix.line_length);
1128                 unlock_fb_info(info);
1129                 ret = copy_to_user(argp, &fix, sizeof(fix)) ? -EFAULT : 0;
1130                 break;
1131         case FBIOPUTCMAP:
1132                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1133                         return -EFAULT;
1134                 ret = fb_set_user_cmap(&cmap, info);
1135                 break;
1136         case FBIOGETCMAP:
1137                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1138                         return -EFAULT;
1139                 if (!lock_fb_info(info))
1140                         return -ENODEV;
1141                 cmap_from = info->cmap;
1142                 unlock_fb_info(info);
1143                 ret = fb_cmap_to_user(&cmap_from, &cmap);
1144                 break;
1145         case FBIOPAN_DISPLAY:
1146                 if (copy_from_user(&var, argp, sizeof(var)))
1147                         return -EFAULT;
1148                 if (!lock_fb_info(info))
1149                         return -ENODEV;
1150                 console_lock();
1151                 ret = fb_pan_display(info, &var);
1152                 console_unlock();
1153                 unlock_fb_info(info);
1154                 if (ret == 0 && copy_to_user(argp, &var, sizeof(var)))
1155                         return -EFAULT;
1156                 break;
1157         case FBIO_CURSOR:
1158                 ret = -EINVAL;
1159                 break;
1160         case FBIOGET_CON2FBMAP:
1161                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1162                         return -EFAULT;
1163                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1164                         return -EINVAL;
1165                 con2fb.framebuffer = -1;
1166                 event.data = &con2fb;
1167                 if (!lock_fb_info(info))
1168                         return -ENODEV;
1169                 event.info = info;
1170                 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
1171                 unlock_fb_info(info);
1172                 ret = copy_to_user(argp, &con2fb, sizeof(con2fb)) ? -EFAULT : 0;
1173                 break;
1174         case FBIOPUT_CON2FBMAP:
1175                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1176                         return -EFAULT;
1177                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1178                         return -EINVAL;
1179                 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
1180                         return -EINVAL;
1181                 if (!registered_fb[con2fb.framebuffer])
1182                         request_module("fb%d", con2fb.framebuffer);
1183                 if (!registered_fb[con2fb.framebuffer]) {
1184                         ret = -EINVAL;
1185                         break;
1186                 }
1187                 event.data = &con2fb;
1188                 if (!lock_fb_info(info))
1189                         return -ENODEV;
1190                 console_lock();
1191                 event.info = info;
1192                 ret = fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP, &event);
1193                 console_unlock();
1194                 unlock_fb_info(info);
1195                 break;
1196         case FBIOBLANK:
1197                 pr_info("FBIOBLANK:mode[%d]\n", (int)arg);
1198                 if (!lock_fb_info(info))
1199                         return -ENODEV;
1200                 console_lock();
1201                 info->flags |= FBINFO_MISC_USEREVENT;
1202                 ret = fb_blank(info, arg);
1203                 info->flags &= ~FBINFO_MISC_USEREVENT;
1204                 console_unlock();
1205                 unlock_fb_info(info);
1206                 pr_info("FBIOBLANK:mode[%d]done\n", (int)arg);
1207                 break;
1208         default:
1209                 /*if (!lock_fb_info(info))
1210                         return -ENODEV;*/
1211                 fb = info->fbops;
1212                 if (fb->fb_ioctl)
1213                         ret = fb->fb_ioctl(info, cmd, arg);
1214                 else
1215                         ret = -ENOTTY;
1216                 /*unlock_fb_info(info);*/
1217         }
1218         return ret;
1219 }
1220
1221 static long fb_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1222 {
1223         struct fb_info *info = file_fb_info(file);
1224
1225         if (!info)
1226                 return -ENODEV;
1227         return do_fb_ioctl(info, cmd, arg);
1228 }
1229
1230 #ifdef CONFIG_COMPAT
1231 struct fb_fix_screeninfo32 {
1232         char                    id[16];
1233         compat_caddr_t          smem_start;
1234         u32                     smem_len;
1235         u32                     type;
1236         u32                     type_aux;
1237         u32                     visual;
1238         u16                     xpanstep;
1239         u16                     ypanstep;
1240         u16                     ywrapstep;
1241         u32                     line_length;
1242         compat_caddr_t          mmio_start;
1243         u32                     mmio_len;
1244         u32                     accel;
1245         u16                     reserved[3];
1246 };
1247
1248 struct fb_cmap32 {
1249         u32                     start;
1250         u32                     len;
1251         compat_caddr_t  red;
1252         compat_caddr_t  green;
1253         compat_caddr_t  blue;
1254         compat_caddr_t  transp;
1255 };
1256
1257 static int fb_getput_cmap(struct fb_info *info, unsigned int cmd,
1258                           unsigned long arg)
1259 {
1260         struct fb_cmap_user __user *cmap;
1261         struct fb_cmap32 __user *cmap32;
1262         __u32 data;
1263         int err;
1264
1265         cmap = compat_alloc_user_space(sizeof(*cmap));
1266         cmap32 = compat_ptr(arg);
1267
1268         if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1269                 return -EFAULT;
1270
1271         if (get_user(data, &cmap32->red) ||
1272             put_user(compat_ptr(data), &cmap->red) ||
1273             get_user(data, &cmap32->green) ||
1274             put_user(compat_ptr(data), &cmap->green) ||
1275             get_user(data, &cmap32->blue) ||
1276             put_user(compat_ptr(data), &cmap->blue) ||
1277             get_user(data, &cmap32->transp) ||
1278             put_user(compat_ptr(data), &cmap->transp))
1279                 return -EFAULT;
1280
1281         err = do_fb_ioctl(info, cmd, (unsigned long) cmap);
1282
1283         if (!err) {
1284                 if (copy_in_user(&cmap32->start,
1285                                  &cmap->start,
1286                                  2 * sizeof(__u32)))
1287                         err = -EFAULT;
1288         }
1289         return err;
1290 }
1291
1292 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1293                                   struct fb_fix_screeninfo32 __user *fix32)
1294 {
1295         __u32 data;
1296         int err;
1297
1298         err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1299
1300         data = (__u32) (unsigned long) fix->smem_start;
1301         err |= put_user(data, &fix32->smem_start);
1302
1303         err |= put_user(fix->smem_len, &fix32->smem_len);
1304         err |= put_user(fix->type, &fix32->type);
1305         err |= put_user(fix->type_aux, &fix32->type_aux);
1306         err |= put_user(fix->visual, &fix32->visual);
1307         err |= put_user(fix->xpanstep, &fix32->xpanstep);
1308         err |= put_user(fix->ypanstep, &fix32->ypanstep);
1309         err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1310         err |= put_user(fix->line_length, &fix32->line_length);
1311
1312         data = (__u32) (unsigned long) fix->mmio_start;
1313         err |= put_user(data, &fix32->mmio_start);
1314
1315         err |= put_user(fix->mmio_len, &fix32->mmio_len);
1316         err |= put_user(fix->accel, &fix32->accel);
1317         err |= copy_to_user(fix32->reserved, fix->reserved,
1318                             sizeof(fix->reserved));
1319
1320         return err;
1321 }
1322
1323 static int fb_get_fscreeninfo(struct fb_info *info, unsigned int cmd,
1324                               unsigned long arg)
1325 {
1326         mm_segment_t old_fs;
1327         struct fb_fix_screeninfo fix;
1328         struct fb_fix_screeninfo32 __user *fix32;
1329         int err;
1330
1331         fix32 = compat_ptr(arg);
1332
1333         old_fs = get_fs();
1334         set_fs(KERNEL_DS);
1335         err = do_fb_ioctl(info, cmd, (unsigned long) &fix);
1336         set_fs(old_fs);
1337
1338         if (!err)
1339                 err = do_fscreeninfo_to_user(&fix, fix32);
1340
1341         return err;
1342 }
1343
1344 static long fb_compat_ioctl(struct file *file, unsigned int cmd,
1345                             unsigned long arg)
1346 {
1347         struct fb_info *info = file_fb_info(file);
1348         struct fb_ops *fb;
1349         long ret = -ENOIOCTLCMD;
1350
1351         if (!info)
1352                 return -ENODEV;
1353         fb = info->fbops;
1354         switch(cmd) {
1355         case FBIOGET_VSCREENINFO:
1356         case FBIOPUT_VSCREENINFO:
1357         case FBIOPAN_DISPLAY:
1358         case FBIOGET_CON2FBMAP:
1359         case FBIOPUT_CON2FBMAP:
1360                 arg = (unsigned long) compat_ptr(arg);
1361         case FBIOBLANK:
1362                 ret = do_fb_ioctl(info, cmd, arg);
1363                 break;
1364
1365         case FBIOGET_FSCREENINFO:
1366                 ret = fb_get_fscreeninfo(info, cmd, arg);
1367                 break;
1368
1369         case FBIOGETCMAP:
1370         case FBIOPUTCMAP:
1371                 ret = fb_getput_cmap(info, cmd, arg);
1372                 break;
1373
1374         default:
1375                 if (fb->fb_compat_ioctl)
1376                         ret = fb->fb_compat_ioctl(info, cmd, arg);
1377                 break;
1378         }
1379         return ret;
1380 }
1381 #endif
1382
1383 static int
1384 fb_mmap(struct file *file, struct vm_area_struct * vma)
1385 {
1386         struct fb_info *info = file_fb_info(file);
1387         struct fb_ops *fb;
1388         unsigned long mmio_pgoff;
1389         unsigned long start;
1390         u32 len;
1391
1392         if (!info)
1393                 return -ENODEV;
1394         fb = info->fbops;
1395         if (!fb)
1396                 return -ENODEV;
1397         mutex_lock(&info->mm_lock);
1398         if (fb->fb_mmap) {
1399                 int res;
1400                 res = fb->fb_mmap(info, vma);
1401                 mutex_unlock(&info->mm_lock);
1402                 return res;
1403         }
1404
1405         /*
1406          * Ugh. This can be either the frame buffer mapping, or
1407          * if pgoff points past it, the mmio mapping.
1408          */
1409         start = info->fix.smem_start;
1410         len = info->fix.smem_len;
1411         mmio_pgoff = PAGE_ALIGN((start & ~PAGE_MASK) + len) >> PAGE_SHIFT;
1412         if (vma->vm_pgoff >= mmio_pgoff) {
1413                 if (info->var.accel_flags) {
1414                         mutex_unlock(&info->mm_lock);
1415                         return -EINVAL;
1416                 }
1417
1418                 vma->vm_pgoff -= mmio_pgoff;
1419                 start = info->fix.mmio_start;
1420                 len = info->fix.mmio_len;
1421         }
1422         mutex_unlock(&info->mm_lock);
1423
1424         vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
1425         fb_pgprotect(file, vma, start);
1426
1427         return vm_iomap_memory(vma, start, len);
1428 }
1429
1430 static int
1431 fb_open(struct inode *inode, struct file *file)
1432 __acquires(&info->lock)
1433 __releases(&info->lock)
1434 {
1435         int fbidx = iminor(inode);
1436         struct fb_info *info;
1437         int res = 0;
1438
1439         info = get_fb_info(fbidx);
1440         if (!info) {
1441                 request_module("fb%d", fbidx);
1442                 info = get_fb_info(fbidx);
1443                 if (!info)
1444                         return -ENODEV;
1445         }
1446         if (IS_ERR(info))
1447                 return PTR_ERR(info);
1448
1449         mutex_lock(&info->lock);
1450         if (!try_module_get(info->fbops->owner)) {
1451                 res = -ENODEV;
1452                 goto out;
1453         }
1454         file->private_data = info;
1455         if (info->fbops->fb_open) {
1456                 res = info->fbops->fb_open(info,1);
1457                 if (res)
1458                         module_put(info->fbops->owner);
1459         }
1460 #ifdef CONFIG_FB_DEFERRED_IO
1461         if (info->fbdefio)
1462                 fb_deferred_io_open(info, inode, file);
1463 #endif
1464 out:
1465         mutex_unlock(&info->lock);
1466         if (res)
1467                 put_fb_info(info);
1468         return res;
1469 }
1470
1471 static int
1472 fb_release(struct inode *inode, struct file *file)
1473 __acquires(&info->lock)
1474 __releases(&info->lock)
1475 {
1476         struct fb_info * const info = file->private_data;
1477
1478         mutex_lock(&info->lock);
1479         if (info->fbops->fb_release)
1480                 info->fbops->fb_release(info,1);
1481         module_put(info->fbops->owner);
1482         mutex_unlock(&info->lock);
1483         put_fb_info(info);
1484         return 0;
1485 }
1486
1487 static const struct file_operations fb_fops = {
1488         .owner =        THIS_MODULE,
1489         .read =         fb_read,
1490         .write =        fb_write,
1491         .unlocked_ioctl = fb_ioctl,
1492 #ifdef CONFIG_COMPAT
1493         .compat_ioctl = fb_compat_ioctl,
1494 #endif
1495         .mmap =         fb_mmap,
1496         .open =         fb_open,
1497         .release =      fb_release,
1498 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1499         .get_unmapped_area = get_fb_unmapped_area,
1500 #endif
1501 #ifdef CONFIG_FB_DEFERRED_IO
1502         .fsync =        fb_deferred_io_fsync,
1503 #endif
1504         .llseek =       default_llseek,
1505 };
1506
1507 struct class *fb_class;
1508 EXPORT_SYMBOL(fb_class);
1509
1510 static int fb_check_foreignness(struct fb_info *fi)
1511 {
1512         const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN;
1513
1514         fi->flags &= ~FBINFO_FOREIGN_ENDIAN;
1515
1516 #ifdef __BIG_ENDIAN
1517         fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH;
1518 #else
1519         fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0;
1520 #endif /* __BIG_ENDIAN */
1521
1522         if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) {
1523                 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to "
1524                        "support this framebuffer\n", fi->fix.id);
1525                 return -ENOSYS;
1526         } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) {
1527                 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to "
1528                        "support this framebuffer\n", fi->fix.id);
1529                 return -ENOSYS;
1530         }
1531
1532         return 0;
1533 }
1534
1535 static bool apertures_overlap(struct aperture *gen, struct aperture *hw)
1536 {
1537         /* is the generic aperture base the same as the HW one */
1538         if (gen->base == hw->base)
1539                 return true;
1540         /* is the generic aperture base inside the hw base->hw base+size */
1541         if (gen->base > hw->base && gen->base < hw->base + hw->size)
1542                 return true;
1543         return false;
1544 }
1545
1546 static bool fb_do_apertures_overlap(struct apertures_struct *gena,
1547                                     struct apertures_struct *hwa)
1548 {
1549         int i, j;
1550         if (!hwa || !gena)
1551                 return false;
1552
1553         for (i = 0; i < hwa->count; ++i) {
1554                 struct aperture *h = &hwa->ranges[i];
1555                 for (j = 0; j < gena->count; ++j) {
1556                         struct aperture *g = &gena->ranges[j];
1557                         printk(KERN_DEBUG "checking generic (%llx %llx) vs hw (%llx %llx)\n",
1558                                 (unsigned long long)g->base,
1559                                 (unsigned long long)g->size,
1560                                 (unsigned long long)h->base,
1561                                 (unsigned long long)h->size);
1562                         if (apertures_overlap(g, h))
1563                                 return true;
1564                 }
1565         }
1566
1567         return false;
1568 }
1569
1570 static int do_unregister_framebuffer(struct fb_info *fb_info);
1571
1572 #define VGA_FB_PHYS 0xA0000
1573 static void do_remove_conflicting_framebuffers(struct apertures_struct *a,
1574                                      const char *name, bool primary)
1575 {
1576         int i;
1577
1578         /* check all firmware fbs and kick off if the base addr overlaps */
1579         for (i = 0 ; i < FB_MAX; i++) {
1580                 struct apertures_struct *gen_aper;
1581                 if (!registered_fb[i])
1582                         continue;
1583
1584                 if (!(registered_fb[i]->flags & FBINFO_MISC_FIRMWARE))
1585                         continue;
1586
1587                 gen_aper = registered_fb[i]->apertures;
1588                 if (fb_do_apertures_overlap(gen_aper, a) ||
1589                         (primary && gen_aper && gen_aper->count &&
1590                          gen_aper->ranges[0].base == VGA_FB_PHYS)) {
1591
1592                         printk(KERN_INFO "fb: conflicting fb hw usage "
1593                                "%s vs %s - removing generic driver\n",
1594                                name, registered_fb[i]->fix.id);
1595                         do_unregister_framebuffer(registered_fb[i]);
1596                 }
1597         }
1598 }
1599
1600 static int do_register_framebuffer(struct fb_info *fb_info)
1601 {
1602         int i;
1603         struct fb_event event;
1604         struct fb_videomode mode;
1605
1606         if (fb_check_foreignness(fb_info))
1607                 return -ENOSYS;
1608
1609         do_remove_conflicting_framebuffers(fb_info->apertures, fb_info->fix.id,
1610                                          fb_is_primary_device(fb_info));
1611
1612         if (num_registered_fb == FB_MAX)
1613                 return -ENXIO;
1614
1615         num_registered_fb++;
1616         for (i = 0 ; i < FB_MAX; i++)
1617                 if (!registered_fb[i])
1618                         break;
1619         fb_info->node = i;
1620         atomic_set(&fb_info->count, 1);
1621         mutex_init(&fb_info->lock);
1622         mutex_init(&fb_info->mm_lock);
1623
1624         fb_info->dev = device_create(fb_class, fb_info->device,
1625                                      MKDEV(FB_MAJOR, i), NULL, "fb%d", i);
1626         if (IS_ERR(fb_info->dev)) {
1627                 /* Not fatal */
1628                 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1629                 fb_info->dev = NULL;
1630         } else
1631                 fb_init_device(fb_info);
1632
1633         if (fb_info->pixmap.addr == NULL) {
1634                 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1635                 if (fb_info->pixmap.addr) {
1636                         fb_info->pixmap.size = FBPIXMAPSIZE;
1637                         fb_info->pixmap.buf_align = 1;
1638                         fb_info->pixmap.scan_align = 1;
1639                         fb_info->pixmap.access_align = 32;
1640                         fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1641                 }
1642         }
1643         fb_info->pixmap.offset = 0;
1644
1645         if (!fb_info->pixmap.blit_x)
1646                 fb_info->pixmap.blit_x = ~(u32)0;
1647
1648         if (!fb_info->pixmap.blit_y)
1649                 fb_info->pixmap.blit_y = ~(u32)0;
1650
1651         if (!fb_info->modelist.prev || !fb_info->modelist.next)
1652                 INIT_LIST_HEAD(&fb_info->modelist);
1653
1654         if (fb_info->skip_vt_switch)
1655                 pm_vt_switch_required(fb_info->dev, false);
1656         else
1657                 pm_vt_switch_required(fb_info->dev, true);
1658
1659         fb_var_to_videomode(&mode, &fb_info->var);
1660         fb_add_videomode(&mode, &fb_info->modelist);
1661         registered_fb[i] = fb_info;
1662
1663         event.info = fb_info;
1664         if (!lock_fb_info(fb_info))
1665                 return -ENODEV;
1666         console_lock();
1667         fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1668         console_unlock();
1669         unlock_fb_info(fb_info);
1670         return 0;
1671 }
1672
1673 static int do_unregister_framebuffer(struct fb_info *fb_info)
1674 {
1675         struct fb_event event;
1676         int i, ret = 0;
1677
1678         i = fb_info->node;
1679         if (i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)
1680                 return -EINVAL;
1681
1682         if (!lock_fb_info(fb_info))
1683                 return -ENODEV;
1684         console_lock();
1685         event.info = fb_info;
1686         ret = fb_notifier_call_chain(FB_EVENT_FB_UNBIND, &event);
1687         console_unlock();
1688         unlock_fb_info(fb_info);
1689
1690         if (ret)
1691                 return -EINVAL;
1692
1693         pm_vt_switch_unregister(fb_info->dev);
1694
1695         unlink_framebuffer(fb_info);
1696         if (fb_info->pixmap.addr &&
1697             (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1698                 kfree(fb_info->pixmap.addr);
1699         fb_destroy_modelist(&fb_info->modelist);
1700         registered_fb[i] = NULL;
1701         num_registered_fb--;
1702         fb_cleanup_device(fb_info);
1703         event.info = fb_info;
1704         console_lock();
1705         fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1706         console_unlock();
1707
1708         /* this may free fb info */
1709         put_fb_info(fb_info);
1710         return 0;
1711 }
1712
1713 int unlink_framebuffer(struct fb_info *fb_info)
1714 {
1715         int i;
1716
1717         i = fb_info->node;
1718         if (i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)
1719                 return -EINVAL;
1720
1721         if (fb_info->dev) {
1722                 device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1723                 fb_info->dev = NULL;
1724         }
1725         return 0;
1726 }
1727 EXPORT_SYMBOL(unlink_framebuffer);
1728
1729 void remove_conflicting_framebuffers(struct apertures_struct *a,
1730                                      const char *name, bool primary)
1731 {
1732         mutex_lock(&registration_lock);
1733         do_remove_conflicting_framebuffers(a, name, primary);
1734         mutex_unlock(&registration_lock);
1735 }
1736 EXPORT_SYMBOL(remove_conflicting_framebuffers);
1737
1738 /**
1739  *      register_framebuffer - registers a frame buffer device
1740  *      @fb_info: frame buffer info structure
1741  *
1742  *      Registers a frame buffer device @fb_info.
1743  *
1744  *      Returns negative errno on error, or zero for success.
1745  *
1746  */
1747 int
1748 register_framebuffer(struct fb_info *fb_info)
1749 {
1750         int ret;
1751
1752         mutex_lock(&registration_lock);
1753         ret = do_register_framebuffer(fb_info);
1754         mutex_unlock(&registration_lock);
1755
1756         return ret;
1757 }
1758
1759 /**
1760  *      unregister_framebuffer - releases a frame buffer device
1761  *      @fb_info: frame buffer info structure
1762  *
1763  *      Unregisters a frame buffer device @fb_info.
1764  *
1765  *      Returns negative errno on error, or zero for success.
1766  *
1767  *      This function will also notify the framebuffer console
1768  *      to release the driver.
1769  *
1770  *      This is meant to be called within a driver's module_exit()
1771  *      function. If this is called outside module_exit(), ensure
1772  *      that the driver implements fb_open() and fb_release() to
1773  *      check that no processes are using the device.
1774  */
1775 int
1776 unregister_framebuffer(struct fb_info *fb_info)
1777 {
1778         int ret;
1779
1780         mutex_lock(&registration_lock);
1781         ret = do_unregister_framebuffer(fb_info);
1782         mutex_unlock(&registration_lock);
1783
1784         return ret;
1785 }
1786
1787 /**
1788  *      fb_set_suspend - low level driver signals suspend
1789  *      @info: framebuffer affected
1790  *      @state: 0 = resuming, !=0 = suspending
1791  *
1792  *      This is meant to be used by low level drivers to
1793  *      signal suspend/resume to the core & clients.
1794  *      It must be called with the console semaphore held
1795  */
1796 void fb_set_suspend(struct fb_info *info, int state)
1797 {
1798         struct fb_event event;
1799
1800         event.info = info;
1801         if (state) {
1802                 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event);
1803                 info->state = FBINFO_STATE_SUSPENDED;
1804         } else {
1805                 info->state = FBINFO_STATE_RUNNING;
1806                 fb_notifier_call_chain(FB_EVENT_RESUME, &event);
1807         }
1808 }
1809
1810 /**
1811  *      fbmem_init - init frame buffer subsystem
1812  *
1813  *      Initialize the frame buffer subsystem.
1814  *
1815  *      NOTE: This function is _only_ to be called by drivers/char/mem.c.
1816  *
1817  */
1818
1819 static int __init
1820 fbmem_init(void)
1821 {
1822         proc_create("fb", 0, NULL, &fb_proc_fops);
1823
1824         if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1825                 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1826
1827         fb_class = class_create(THIS_MODULE, "graphics");
1828         if (IS_ERR(fb_class)) {
1829                 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1830                 fb_class = NULL;
1831         }
1832         return 0;
1833 }
1834
1835 #ifdef MODULE
1836 module_init(fbmem_init);
1837 static void __exit
1838 fbmem_exit(void)
1839 {
1840         remove_proc_entry("fb", NULL);
1841         class_destroy(fb_class);
1842         unregister_chrdev(FB_MAJOR, "fb");
1843 }
1844
1845 module_exit(fbmem_exit);
1846 MODULE_LICENSE("GPL");
1847 MODULE_DESCRIPTION("Framebuffer base");
1848 #else
1849 subsys_initcall(fbmem_init);
1850 #endif
1851
1852 int fb_new_modelist(struct fb_info *info)
1853 {
1854         struct fb_event event;
1855         struct fb_var_screeninfo var = info->var;
1856         struct list_head *pos, *n;
1857         struct fb_modelist *modelist;
1858         struct fb_videomode *m, mode;
1859         int err = 1;
1860
1861         list_for_each_safe(pos, n, &info->modelist) {
1862                 modelist = list_entry(pos, struct fb_modelist, list);
1863                 m = &modelist->mode;
1864                 fb_videomode_to_var(&var, m);
1865                 var.activate = FB_ACTIVATE_TEST;
1866                 err = fb_set_var(info, &var);
1867                 fb_var_to_videomode(&mode, &var);
1868                 if (err || !fb_mode_is_equal(m, &mode)) {
1869                         list_del(pos);
1870                         kfree(pos);
1871                 }
1872         }
1873
1874         err = 1;
1875
1876         if (!list_empty(&info->modelist)) {
1877                 event.info = info;
1878                 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
1879         }
1880
1881         return err;
1882 }
1883
1884 static char *video_options[FB_MAX] __read_mostly;
1885 static int ofonly __read_mostly;
1886
1887 /**
1888  * fb_get_options - get kernel boot parameters
1889  * @name:   framebuffer name as it would appear in
1890  *          the boot parameter line
1891  *          (video=<name>:<options>)
1892  * @option: the option will be stored here
1893  *
1894  * NOTE: Needed to maintain backwards compatibility
1895  */
1896 int fb_get_options(char *name, char **option)
1897 {
1898         char *opt, *options = NULL;
1899         int retval = 0;
1900         int name_len = strlen(name), i;
1901
1902         if (name_len && ofonly && strncmp(name, "offb", 4))
1903                 retval = 1;
1904
1905         if (name_len && !retval) {
1906                 for (i = 0; i < FB_MAX; i++) {
1907                         if (video_options[i] == NULL)
1908                                 continue;
1909                         if (!video_options[i][0])
1910                                 continue;
1911                         opt = video_options[i];
1912                         if (!strncmp(name, opt, name_len) &&
1913                             opt[name_len] == ':')
1914                                 options = opt + name_len + 1;
1915                 }
1916         }
1917         if (options && !strncmp(options, "off", 3))
1918                 retval = 1;
1919
1920         if (option)
1921                 *option = options;
1922
1923         return retval;
1924 }
1925
1926 #ifndef MODULE
1927 /**
1928  *      video_setup - process command line options
1929  *      @options: string of options
1930  *
1931  *      Process command line options for frame buffer subsystem.
1932  *
1933  *      NOTE: This function is a __setup and __init function.
1934  *            It only stores the options.  Drivers have to call
1935  *            fb_get_options() as necessary.
1936  *
1937  *      Returns zero.
1938  *
1939  */
1940 static int __init video_setup(char *options)
1941 {
1942         int i, global = 0;
1943
1944         if (!options || !*options)
1945                 global = 1;
1946
1947         if (!global && !strncmp(options, "ofonly", 6)) {
1948                 ofonly = 1;
1949                 global = 1;
1950         }
1951
1952         if (!global && !strchr(options, ':')) {
1953                 fb_mode_option = options;
1954                 global = 1;
1955         }
1956
1957         if (!global) {
1958                 for (i = 0; i < FB_MAX; i++) {
1959                         if (video_options[i] == NULL) {
1960                                 video_options[i] = options;
1961                                 break;
1962                         }
1963
1964                 }
1965         }
1966
1967         return 1;
1968 }
1969 __setup("video=", video_setup);
1970 #endif
1971
1972     /*
1973      *  Visible symbols for modules
1974      */
1975
1976 EXPORT_SYMBOL(register_framebuffer);
1977 EXPORT_SYMBOL(unregister_framebuffer);
1978 EXPORT_SYMBOL(num_registered_fb);
1979 EXPORT_SYMBOL(registered_fb);
1980 EXPORT_SYMBOL(fb_show_logo);
1981 EXPORT_SYMBOL(fb_set_var);
1982 EXPORT_SYMBOL(fb_blank);
1983 EXPORT_SYMBOL(fb_pan_display);
1984 EXPORT_SYMBOL(fb_get_buffer_offset);
1985 EXPORT_SYMBOL(fb_set_suspend);
1986 EXPORT_SYMBOL(fb_get_options);
1987
1988 MODULE_LICENSE("GPL");