drivers/video/fbmem.c

   1 /*
   2  *  linux/drivers/video/fbmem.c
   3  *
   4  *  Copyright (C) 1994 Martin Schaller
   5  *
   6  *      2001 - Documented with DocBook
   7  *      - Brad Douglas <brad@neruo.com>
   8  *
   9  * This file is subject to the terms and conditions of the GNU General Public
  10  * License.  See the file COPYING in the main directory of this archive
  11  * for more details.
  12  */
  13
  14 #include <linux/module.h>
  15
  16 #include <linux/compat.h>
  17 #include <linux/types.h>
  18 #include <linux/errno.h>
  19 #include <linux/smp_lock.h>
  20 #include <linux/kernel.h>
  21 #include <linux/major.h>
  22 #include <linux/slab.h>
  23 #include <linux/mm.h>
  24 #include <linux/mman.h>
  25 #include <linux/vt.h>
  26 #include <linux/init.h>
  27 #include <linux/linux_logo.h>
  28 #include <linux/proc_fs.h>
  29 #include <linux/seq_file.h>
  30 #include <linux/console.h>
  31 #include <linux/kmod.h>
  32 #include <linux/err.h>
  33 #include <linux/device.h>
  34 #include <linux/efi.h>
  35 #include <linux/fb.h>
  36
  37 #include <asm/fb.h>
  38
  39
  40     /*
  41      *  Frame buffer device initialization and setup routines
  42      */
  43
  44 #define FBPIXMAPSIZE    (1024 * 8)
  45
  46 struct fb_info *registered_fb[FB_MAX] __read_mostly;
  47 int num_registered_fb __read_mostly;
  48
  49 /*
  50  * Helpers
  51  */
  52
  53 int fb_get_color_depth(struct fb_var_screeninfo *var,
  54                        struct fb_fix_screeninfo *fix)
  55 {
  56         int depth = 0;
  57
  58         if (fix->visual == FB_VISUAL_MONO01 ||
  59             fix->visual == FB_VISUAL_MONO10)
  60                 depth = 1;
  61         else {
  62                 if (var->green.length == var->blue.length &&
  63                     var->green.length == var->red.length &&
  64                     var->green.offset == var->blue.offset &&
  65                     var->green.offset == var->red.offset)
  66                         depth = var->green.length;
  67                 else
  68                         depth = var->green.length + var->red.length +
  69                                 var->blue.length;
  70         }
  71
  72         return depth;
  73 }
  74 EXPORT_SYMBOL(fb_get_color_depth);
  75
  76 /*
  77  * Data padding functions.
  78  */
  79 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
  80 {
  81         __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
  82 }
  83 EXPORT_SYMBOL(fb_pad_aligned_buffer);
  84
  85 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
  86                                 u32 shift_high, u32 shift_low, u32 mod)
  87 {
  88         u8 mask = (u8) (0xfff << shift_high), tmp;
  89         int i, j;
  90
  91         for (i = height; i--; ) {
  92                 for (j = 0; j < idx; j++) {
  93                         tmp = dst[j];
  94                         tmp &= mask;
  95                         tmp |= *src >> shift_low;
  96                         dst[j] = tmp;
  97                         tmp = *src << shift_high;
  98                         dst[j+1] = tmp;
  99                         src++;
 100                 }
 101                 tmp = dst[idx];
 102                 tmp &= mask;
 103                 tmp |= *src >> shift_low;
 104                 dst[idx] = tmp;
 105                 if (shift_high < mod) {
 106                         tmp = *src << shift_high;
 107                         dst[idx+1] = tmp;
 108                 }
 109                 src++;
 110                 dst += d_pitch;
 111         }
 112 }
 113 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
 114
 115 /*
 116  * we need to lock this section since fb_cursor
 117  * may use fb_imageblit()
 118  */
 119 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
 120 {
 121         u32 align = buf->buf_align - 1, offset;
 122         char *addr = buf->addr;
 123
 124         /* If IO mapped, we need to sync before access, no sharing of
 125          * the pixmap is done
 126          */
 127         if (buf->flags & FB_PIXMAP_IO) {
 128                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 129                         info->fbops->fb_sync(info);
 130                 return addr;
 131         }
 132
 133         /* See if we fit in the remaining pixmap space */
 134         offset = buf->offset + align;
 135         offset &= ~align;
 136         if (offset + size > buf->size) {
 137                 /* We do not fit. In order to be able to re-use the buffer,
 138                  * we must ensure no asynchronous DMA'ing or whatever operation
 139                  * is in progress, we sync for that.
 140                  */
 141                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 142                         info->fbops->fb_sync(info);
 143                 offset = 0;
 144         }
 145         buf->offset = offset + size;
 146         addr += offset;
 147
 148         return addr;
 149 }
 150
 151 #ifdef CONFIG_LOGO
 152
 153 static inline unsigned safe_shift(unsigned d, int n)
 154 {
 155         return n < 0 ? d >> -n : d << n;
 156 }
 157
 158 static void fb_set_logocmap(struct fb_info *info,
 159                                    const struct linux_logo *logo)
 160 {
 161         struct fb_cmap palette_cmap;
 162         u16 palette_green[16];
 163         u16 palette_blue[16];
 164         u16 palette_red[16];
 165         int i, j, n;
 166         const unsigned char *clut = logo->clut;
 167
 168         palette_cmap.start = 0;
 169         palette_cmap.len = 16;
 170         palette_cmap.red = palette_red;
 171         palette_cmap.green = palette_green;
 172         palette_cmap.blue = palette_blue;
 173         palette_cmap.transp = NULL;
 174
 175         for (i = 0; i < logo->clutsize; i += n) {
 176                 n = logo->clutsize - i;
 177                 /* palette_cmap provides space for only 16 colors at once */
 178                 if (n > 16)
 179                         n = 16;
 180                 palette_cmap.start = 32 + i;
 181                 palette_cmap.len = n;
 182                 for (j = 0; j < n; ++j) {
 183                         palette_cmap.red[j] = clut[0] << 8 | clut[0];
 184                         palette_cmap.green[j] = clut[1] << 8 | clut[1];
 185                         palette_cmap.blue[j] = clut[2] << 8 | clut[2];
 186                         clut += 3;
 187                 }
 188                 fb_set_cmap(&palette_cmap, info);
 189         }
 190 }
 191
 192 static void  fb_set_logo_truepalette(struct fb_info *info,
 193                                             const struct linux_logo *logo,
 194                                             u32 *palette)
 195 {
 196         static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
 197         unsigned char redmask, greenmask, bluemask;
 198         int redshift, greenshift, blueshift;
 199         int i;
 200         const unsigned char *clut = logo->clut;
 201
 202         /*
 203          * We have to create a temporary palette since console palette is only
 204          * 16 colors long.
 205          */
 206         /* Bug: Doesn't obey msb_right ... (who needs that?) */
 207         redmask   = mask[info->var.red.length   < 8 ? info->var.red.length   : 8];
 208         greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
 209         bluemask  = mask[info->var.blue.length  < 8 ? info->var.blue.length  : 8];
 210         redshift   = info->var.red.offset   - (8 - info->var.red.length);
 211         greenshift = info->var.green.offset - (8 - info->var.green.length);
 212         blueshift  = info->var.blue.offset  - (8 - info->var.blue.length);
 213
 214         for ( i = 0; i < logo->clutsize; i++) {
 215                 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
 216                                  safe_shift((clut[1] & greenmask), greenshift) |
 217                                  safe_shift((clut[2] & bluemask), blueshift));
 218                 clut += 3;
 219         }
 220 }
 221
 222 static void fb_set_logo_directpalette(struct fb_info *info,
 223                                              const struct linux_logo *logo,
 224                                              u32 *palette)
 225 {
 226         int redshift, greenshift, blueshift;
 227         int i;
 228
 229         redshift = info->var.red.offset;
 230         greenshift = info->var.green.offset;
 231         blueshift = info->var.blue.offset;
 232
 233         for (i = 32; i < logo->clutsize; i++)
 234                 palette[i] = i << redshift | i << greenshift | i << blueshift;
 235 }
 236
 237 static void fb_set_logo(struct fb_info *info,
 238                                const struct linux_logo *logo, u8 *dst,
 239                                int depth)
 240 {
 241         int i, j, k;
 242         const u8 *src = logo->data;
 243         u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
 244         u8 fg = 1, d;
 245
 246         switch (fb_get_color_depth(&info->var, &info->fix)) {
 247         case 1:
 248                 fg = 1;
 249                 break;
 250         case 2:
 251                 fg = 3;
 252                 break;
 253         default:
 254                 fg = 7;
 255                 break;
 256         }
 257
 258         if (info->fix.visual == FB_VISUAL_MONO01 ||
 259             info->fix.visual == FB_VISUAL_MONO10)
 260                 fg = ~((u8) (0xfff << info->var.green.length));
 261
 262         switch (depth) {
 263         case 4:
 264                 for (i = 0; i < logo->height; i++)
 265                         for (j = 0; j < logo->width; src++) {
 266                                 *dst++ = *src >> 4;
 267                                 j++;
 268                                 if (j < logo->width) {
 269                                         *dst++ = *src & 0x0f;
 270                                         j++;
 271                                 }
 272                         }
 273                 break;
 274         case 1:
 275                 for (i = 0; i < logo->height; i++) {
 276                         for (j = 0; j < logo->width; src++) {
 277                                 d = *src ^ xor;
 278                                 for (k = 7; k >= 0; k--) {
 279                                         *dst++ = ((d >> k) & 1) ? fg : 0;
 280                                         j++;
 281                                 }
 282                         }
 283                 }
 284                 break;
 285         }
 286 }
 287
 288 /*
 289  * Three (3) kinds of logo maps exist.  linux_logo_clut224 (>16 colors),
 290  * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors).  Depending on
 291  * the visual format and color depth of the framebuffer, the DAC, the
 292  * pseudo_palette, and the logo data will be adjusted accordingly.
 293  *
 294  * Case 1 - linux_logo_clut224:
 295  * Color exceeds the number of console colors (16), thus we set the hardware DAC
 296  * using fb_set_cmap() appropriately.  The "needs_cmapreset"  flag will be set.
 297  *
 298  * For visuals that require color info from the pseudo_palette, we also construct
 299  * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
 300  * will be set.
 301  *
 302  * Case 2 - linux_logo_vga16:
 303  * The number of colors just matches the console colors, thus there is no need
 304  * to set the DAC or the pseudo_palette.  However, the bitmap is packed, ie,
 305  * each byte contains color information for two pixels (upper and lower nibble).
 306  * To be consistent with fb_imageblit() usage, we therefore separate the two
 307  * nibbles into separate bytes. The "depth" flag will be set to 4.
 308  *
 309  * Case 3 - linux_logo_mono:
 310  * This is similar with Case 2.  Each byte contains information for 8 pixels.
 311  * We isolate each bit and expand each into a byte. The "depth" flag will
 312  * be set to 1.
 313  */
 314 static struct logo_data {
 315         int depth;
 316         int needs_directpalette;
 317         int needs_truepalette;
 318         int needs_cmapreset;
 319         const struct linux_logo *logo;
 320 } fb_logo __read_mostly;
 321
 322 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
 323 {
 324         u32 size = width * height, i;
 325
 326         out += size - 1;
 327
 328         for (i = size; i--; )
 329                 *out-- = *in++;
 330 }
 331
 332 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
 333 {
 334         int i, j, h = height - 1;
 335
 336         for (i = 0; i < height; i++)
 337                 for (j = 0; j < width; j++)
 338                                 out[height * j + h - i] = *in++;
 339 }
 340
 341 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
 342 {
 343         int i, j, w = width - 1;
 344
 345         for (i = 0; i < height; i++)
 346                 for (j = 0; j < width; j++)
 347                         out[height * (w - j) + i] = *in++;
 348 }
 349
 350 static void fb_rotate_logo(struct fb_info *info, u8 *dst,
 351                            struct fb_image *image, int rotate)
 352 {
 353         u32 tmp;
 354
 355         if (rotate == FB_ROTATE_UD) {
 356                 fb_rotate_logo_ud(image->data, dst, image->width,
 357                                   image->height);
 358                 image->dx = info->var.xres - image->width - image->dx;
 359                 image->dy = info->var.yres - image->height - image->dy;
 360         } else if (rotate == FB_ROTATE_CW) {
 361                 fb_rotate_logo_cw(image->data, dst, image->width,
 362                                   image->height);
 363                 tmp = image->width;
 364                 image->width = image->height;
 365                 image->height = tmp;
 366                 tmp = image->dy;
 367                 image->dy = image->dx;
 368                 image->dx = info->var.xres - image->width - tmp;
 369         } else if (rotate == FB_ROTATE_CCW) {
 370                 fb_rotate_logo_ccw(image->data, dst, image->width,
 371                                    image->height);
 372                 tmp = image->width;
 373                 image->width = image->height;
 374                 image->height = tmp;
 375                 tmp = image->dx;
 376                 image->dx = image->dy;
 377                 image->dy = info->var.yres - image->height - tmp;
 378         }
 379
 380         image->data = dst;
 381 }
 382
 383 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
 384                             int rotate, unsigned int num)
 385 {
 386         unsigned int x;
 387
 388         if (rotate == FB_ROTATE_UR) {
 389                 for (x = 0;
 390                      x < num && image->dx + image->width <= info->var.xres;
 391                      x++) {
 392                         info->fbops->fb_imageblit(info, image);
 393                         image->dx += image->width + 8;
 394                 }
 395         } else if (rotate == FB_ROTATE_UD) {
 396                 for (x = 0; x < num && image->dx >= 0; x++) {
 397                         info->fbops->fb_imageblit(info, image);
 398                         image->dx -= image->width + 8;
 399                 }
 400         } else if (rotate == FB_ROTATE_CW) {
 401                 for (x = 0;
 402                      x < num && image->dy + image->height <= info->var.yres;
 403                      x++) {
 404                         info->fbops->fb_imageblit(info, image);
 405                         image->dy += image->height + 8;
 406                 }
 407         } else if (rotate == FB_ROTATE_CCW) {
 408                 for (x = 0; x < num && image->dy >= 0; x++) {
 409                         info->fbops->fb_imageblit(info, image);
 410                         image->dy -= image->height + 8;
 411                 }
 412         }
 413 }
 414
 415 static int fb_show_logo_line(struct fb_info *info, int rotate,
 416                              const struct linux_logo *logo, int y,
 417                              unsigned int n)
 418 {
 419         u32 *palette = NULL, *saved_pseudo_palette = NULL;
 420         unsigned char *logo_new = NULL, *logo_rotate = NULL;
 421         struct fb_image image;
 422
 423         /* Return if the frame buffer is not mapped or suspended */
 424         if (logo == NULL || info->state != FBINFO_STATE_RUNNING ||
 425             info->flags & FBINFO_MODULE)
 426                 return 0;
 427
 428         image.depth = 8;
 429         image.data = logo->data;
 430
 431         if (fb_logo.needs_cmapreset)
 432                 fb_set_logocmap(info, logo);
 433
 434         if (fb_logo.needs_truepalette ||
 435             fb_logo.needs_directpalette) {
 436                 palette = kmalloc(256 * 4, GFP_KERNEL);
 437                 if (palette == NULL)
 438                         return 0;
 439
 440                 if (fb_logo.needs_truepalette)
 441                         fb_set_logo_truepalette(info, logo, palette);
 442                 else
 443                         fb_set_logo_directpalette(info, logo, palette);
 444
 445                 saved_pseudo_palette = info->pseudo_palette;
 446                 info->pseudo_palette = palette;
 447         }
 448
 449         if (fb_logo.depth <= 4) {
 450                 logo_new = kmalloc(logo->width * logo->height, GFP_KERNEL);
 451                 if (logo_new == NULL) {
 452                         kfree(palette);
 453                         if (saved_pseudo_palette)
 454                                 info->pseudo_palette = saved_pseudo_palette;
 455                         return 0;
 456                 }
 457                 image.data = logo_new;
 458                 fb_set_logo(info, logo, logo_new, fb_logo.depth);
 459         }
 460
 461         image.dx = 0;
 462         image.dy = y;
 463         image.width = logo->width;
 464         image.height = logo->height;
 465
 466         if (rotate) {
 467                 logo_rotate = kmalloc(logo->width *
 468                                       logo->height, GFP_KERNEL);
 469                 if (logo_rotate)
 470                         fb_rotate_logo(info, logo_rotate, &image, rotate);
 471         }
 472
 473         fb_do_show_logo(info, &image, rotate, n);
 474
 475         kfree(palette);
 476         if (saved_pseudo_palette != NULL)
 477                 info->pseudo_palette = saved_pseudo_palette;
 478         kfree(logo_new);
 479         kfree(logo_rotate);
 480         return logo->height;
 481 }
 482
 483
 484 #ifdef CONFIG_FB_LOGO_EXTRA
 485
 486 #define FB_LOGO_EX_NUM_MAX 10
 487 static struct logo_data_extra {
 488         const struct linux_logo *logo;
 489         unsigned int n;
 490 } fb_logo_ex[FB_LOGO_EX_NUM_MAX];
 491 static unsigned int fb_logo_ex_num;
 492
 493 void fb_append_extra_logo(const struct linux_logo *logo, unsigned int n)
 494 {
 495         if (!n || fb_logo_ex_num == FB_LOGO_EX_NUM_MAX)
 496                 return;
 497
 498         fb_logo_ex[fb_logo_ex_num].logo = logo;
 499         fb_logo_ex[fb_logo_ex_num].n = n;
 500         fb_logo_ex_num++;
 501 }
 502
 503 static int fb_prepare_extra_logos(struct fb_info *info, unsigned int height,
 504                                   unsigned int yres)
 505 {
 506         unsigned int i;
 507
 508         /* FIXME: logo_ex supports only truecolor fb. */
 509         if (info->fix.visual != FB_VISUAL_TRUECOLOR)
 510                 fb_logo_ex_num = 0;
 511
 512         for (i = 0; i < fb_logo_ex_num; i++) {
 513                 height += fb_logo_ex[i].logo->height;
 514                 if (height > yres) {
 515                         height -= fb_logo_ex[i].logo->height;
 516                         fb_logo_ex_num = i;
 517                         break;
 518                 }
 519         }
 520         return height;
 521 }
 522
 523 static int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
 524 {
 525         unsigned int i;
 526
 527         for (i = 0; i < fb_logo_ex_num; i++)
 528                 y += fb_show_logo_line(info, rotate,
 529                                        fb_logo_ex[i].logo, y, fb_logo_ex[i].n);
 530
 531         return y;
 532 }
 533
 534 #else /* !CONFIG_FB_LOGO_EXTRA */
 535
 536 static inline int fb_prepare_extra_logos(struct fb_info *info,
 537                                          unsigned int height,
 538                                          unsigned int yres)
 539 {
 540         return height;
 541 }
 542
 543 static inline int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
 544 {
 545         return y;
 546 }
 547
 548 #endif /* CONFIG_FB_LOGO_EXTRA */
 549
 550
 551 int fb_prepare_logo(struct fb_info *info, int rotate)
 552 {
 553         int depth = fb_get_color_depth(&info->var, &info->fix);
 554         unsigned int yres;
 555
 556         memset(&fb_logo, 0, sizeof(struct logo_data));
 557
 558         if (info->flags & FBINFO_MISC_TILEBLITTING ||
 559             info->flags & FBINFO_MODULE)
 560                 return 0;
 561
 562         if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
 563                 depth = info->var.blue.length;
 564                 if (info->var.red.length < depth)
 565                         depth = info->var.red.length;
 566                 if (info->var.green.length < depth)
 567                         depth = info->var.green.length;
 568         }
 569
 570         if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) {
 571                 /* assume console colormap */
 572                 depth = 4;
 573         }
 574
 575         /* Return if no suitable logo was found */
 576         fb_logo.logo = fb_find_logo(depth);
 577
 578         if (!fb_logo.logo) {
 579                 return 0;
 580         }
 581
 582         if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
 583                 yres = info->var.yres;
 584         else
 585                 yres = info->var.xres;
 586
 587         if (fb_logo.logo->height > yres) {
 588                 fb_logo.logo = NULL;
 589                 return 0;
 590         }
 591
 592         /* What depth we asked for might be different from what we get */
 593         if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
 594                 fb_logo.depth = 8;
 595         else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
 596                 fb_logo.depth = 4;
 597         else
 598                 fb_logo.depth = 1;
 599
 600
 601         if (fb_logo.depth > 4 && depth > 4) {
 602                 switch (info->fix.visual) {
 603                 case FB_VISUAL_TRUECOLOR:
 604                         fb_logo.needs_truepalette = 1;
 605                         break;
 606                 case FB_VISUAL_DIRECTCOLOR:
 607                         fb_logo.needs_directpalette = 1;
 608                         fb_logo.needs_cmapreset = 1;
 609                         break;
 610                 case FB_VISUAL_PSEUDOCOLOR:
 611                         fb_logo.needs_cmapreset = 1;
 612                         break;
 613                 }
 614         }
 615
 616         return fb_prepare_extra_logos(info, fb_logo.logo->height, yres);
 617 }
 618
 619 int fb_show_logo(struct fb_info *info, int rotate)
 620 {
 621         int y;
 622
 623         y = fb_show_logo_line(info, rotate, fb_logo.logo, 0,
 624                               num_online_cpus());
 625         y = fb_show_extra_logos(info, y, rotate);
 626
 627         return y;
 628 }
 629 #else
 630 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
 631 int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
 632 #endif /* CONFIG_LOGO */
 633
 634 static void *fb_seq_start(struct seq_file *m, loff_t *pos)
 635 {
 636         return (*pos < FB_MAX) ? pos : NULL;
 637 }
 638
 639 static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos)
 640 {
 641         (*pos)++;
 642         return (*pos < FB_MAX) ? pos : NULL;
 643 }
 644
 645 static void fb_seq_stop(struct seq_file *m, void *v)
 646 {
 647 }
 648
 649 static int fb_seq_show(struct seq_file *m, void *v)
 650 {
 651         int i = *(loff_t *)v;
 652         struct fb_info *fi = registered_fb[i];
 653
 654         if (fi)
 655                 seq_printf(m, "%d %s\n", fi->node, fi->fix.id);
 656         return 0;
 657 }
 658
 659 static const struct seq_operations proc_fb_seq_ops = {
 660         .start  = fb_seq_start,
 661         .next   = fb_seq_next,
 662         .stop   = fb_seq_stop,
 663         .show   = fb_seq_show,
 664 };
 665
 666 static int proc_fb_open(struct inode *inode, struct file *file)
 667 {
 668         return seq_open(file, &proc_fb_seq_ops);
 669 }
 670
 671 static const struct file_operations fb_proc_fops = {
 672         .owner          = THIS_MODULE,
 673         .open           = proc_fb_open,
 674         .read           = seq_read,
 675         .llseek         = seq_lseek,
 676         .release        = seq_release,
 677 };
 678
 679 static ssize_t
 680 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 681 {
 682         unsigned long p = *ppos;
 683         struct inode *inode = file->f_path.dentry->d_inode;
 684         int fbidx = iminor(inode);
 685         struct fb_info *info = registered_fb[fbidx];
 686         u32 *buffer, *dst;
 687         u32 __iomem *src;
 688         int c, i, cnt = 0, err = 0;
 689         unsigned long total_size;
 690
 691         if (!info || ! info->screen_base)
 692                 return -ENODEV;
 693
 694         if (info->state != FBINFO_STATE_RUNNING)
 695                 return -EPERM;
 696
 697         if (info->fbops->fb_read)
 698                 return info->fbops->fb_read(info, buf, count, ppos);
 699
 700         total_size = info->screen_size;
 701
 702         if (total_size == 0)
 703                 total_size = info->fix.smem_len;
 704
 705         if (p >= total_size)
 706                 return 0;
 707
 708         if (count >= total_size)
 709                 count = total_size;
 710
 711         if (count + p > total_size)
 712                 count = total_size - p;
 713
 714         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 715                          GFP_KERNEL);
 716         if (!buffer)
 717                 return -ENOMEM;
 718
 719         src = (u32 __iomem *) (info->screen_base + p);
 720
 721         if (info->fbops->fb_sync)
 722                 info->fbops->fb_sync(info);
 723
 724         while (count) {
 725                 c  = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 726                 dst = buffer;
 727                 for (i = c >> 2; i--; )
 728                         *dst++ = fb_readl(src++);
 729                 if (c & 3) {
 730                         u8 *dst8 = (u8 *) dst;
 731                         u8 __iomem *src8 = (u8 __iomem *) src;
 732
 733                         for (i = c & 3; i--;)
 734                                 *dst8++ = fb_readb(src8++);
 735
 736                         src = (u32 __iomem *) src8;
 737                 }
 738
 739                 if (copy_to_user(buf, buffer, c)) {
 740                         err = -EFAULT;
 741                         break;
 742                 }
 743                 *ppos += c;
 744                 buf += c;
 745                 cnt += c;
 746                 count -= c;
 747         }
 748
 749         kfree(buffer);
 750
 751         return (err) ? err : cnt;
 752 }
 753
 754 static ssize_t
 755 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 756 {
 757         unsigned long p = *ppos;
 758         struct inode *inode = file->f_path.dentry->d_inode;
 759         int fbidx = iminor(inode);
 760         struct fb_info *info = registered_fb[fbidx];
 761         u32 *buffer, *src;
 762         u32 __iomem *dst;
 763         int c, i, cnt = 0, err = 0;
 764         unsigned long total_size;
 765
 766         if (!info || !info->screen_base)
 767                 return -ENODEV;
 768
 769         if (info->state != FBINFO_STATE_RUNNING)
 770                 return -EPERM;
 771
 772         if (info->fbops->fb_write)
 773                 return info->fbops->fb_write(info, buf, count, ppos);
 774
 775         total_size = info->screen_size;
 776
 777         if (total_size == 0)
 778                 total_size = info->fix.smem_len;
 779
 780         if (p > total_size)
 781                 return -EFBIG;
 782
 783         if (count > total_size) {
 784                 err = -EFBIG;
 785                 count = total_size;
 786         }
 787
 788         if (count + p > total_size) {
 789                 if (!err)
 790                         err = -ENOSPC;
 791
 792                 count = total_size - p;
 793         }
 794
 795         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 796                          GFP_KERNEL);
 797         if (!buffer)
 798                 return -ENOMEM;
 799
 800         dst = (u32 __iomem *) (info->screen_base + p);
 801
 802         if (info->fbops->fb_sync)
 803                 info->fbops->fb_sync(info);
 804
 805         while (count) {
 806                 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 807                 src = buffer;
 808
 809                 if (copy_from_user(src, buf, c)) {
 810                         err = -EFAULT;
 811                         break;
 812                 }
 813
 814                 for (i = c >> 2; i--; )
 815                         fb_writel(*src++, dst++);
 816
 817                 if (c & 3) {
 818                         u8 *src8 = (u8 *) src;
 819                         u8 __iomem *dst8 = (u8 __iomem *) dst;
 820
 821                         for (i = c & 3; i--; )
 822                                 fb_writeb(*src8++, dst8++);
 823
 824                         dst = (u32 __iomem *) dst8;
 825                 }
 826
 827                 *ppos += c;
 828                 buf += c;
 829                 cnt += c;
 830                 count -= c;
 831         }
 832
 833         kfree(buffer);
 834
 835         return (cnt) ? cnt : err;
 836 }
 837
 838 int
 839 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
 840 {
 841         struct fb_fix_screeninfo *fix = &info->fix;
 842         unsigned int yres = info->var.yres;
 843         int err = 0;
 844
 845         if (var->yoffset > 0) {
 846                 if (var->vmode & FB_VMODE_YWRAP) {
 847                         if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
 848                                 err = -EINVAL;
 849                         else
 850                                 yres = 0;
 851                 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
 852                         err = -EINVAL;
 853         }
 854
 855         if (var->xoffset > 0 && (!fix->xpanstep ||
 856                                  (var->xoffset % fix->xpanstep)))
 857                 err = -EINVAL;
 858
 859         if (err || !info->fbops->fb_pan_display ||
 860             var->yoffset + yres > info->var.yres_virtual ||
 861             var->xoffset + info->var.xres > info->var.xres_virtual)
 862                 return -EINVAL;
 863
 864         if ((err = info->fbops->fb_pan_display(var, info)))
 865                 return err;
 866         info->var.xoffset = var->xoffset;
 867         info->var.yoffset = var->yoffset;
 868         if (var->vmode & FB_VMODE_YWRAP)
 869                 info->var.vmode |= FB_VMODE_YWRAP;
 870         else
 871                 info->var.vmode &= ~FB_VMODE_YWRAP;
 872         return 0;
 873 }
 874
 875 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var,
 876                          u32 activate)
 877 {
 878         struct fb_event event;
 879         struct fb_blit_caps caps, fbcaps;
 880         int err = 0;
 881
 882         memset(&caps, 0, sizeof(caps));
 883         memset(&fbcaps, 0, sizeof(fbcaps));
 884         caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0;
 885         event.info = info;
 886         event.data = &caps;
 887         fb_notifier_call_chain(FB_EVENT_GET_REQ, &event);
 888         info->fbops->fb_get_caps(info, &fbcaps, var);
 889
 890         if (((fbcaps.x ^ caps.x) & caps.x) ||
 891             ((fbcaps.y ^ caps.y) & caps.y) ||
 892             (fbcaps.len < caps.len))
 893                 err = -EINVAL;
 894
 895         return err;
 896 }
 897
 898 int
 899 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
 900 {
 901         int flags = info->flags;
 902         int ret = 0;
 903
 904         if (var->activate & FB_ACTIVATE_INV_MODE) {
 905                 struct fb_videomode mode1, mode2;
 906
 907                 fb_var_to_videomode(&mode1, var);
 908                 fb_var_to_videomode(&mode2, &info->var);
 909                 /* make sure we don't delete the videomode of current var */
 910                 ret = fb_mode_is_equal(&mode1, &mode2);
 911
 912                 if (!ret) {
 913                     struct fb_event event;
 914
 915                     event.info = info;
 916                     event.data = &mode1;
 917                     ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event);
 918                 }
 919
 920                 if (!ret)
 921                     fb_delete_videomode(&mode1, &info->modelist);
 922
 923
 924                 ret = (ret) ? -EINVAL : 0;
 925                 goto done;
 926         }
 927
 928         if ((var->activate & FB_ACTIVATE_FORCE) ||
 929             memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
 930                 u32 activate = var->activate;
 931
 932                 if (!info->fbops->fb_check_var) {
 933                         *var = info->var;
 934                         goto done;
 935                 }
 936
 937                 ret = info->fbops->fb_check_var(var, info);
 938
 939                 if (ret)
 940                         goto done;
 941
 942                 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
 943                         struct fb_videomode mode;
 944
 945                         if (info->fbops->fb_get_caps) {
 946                                 ret = fb_check_caps(info, var, activate);
 947
 948                                 if (ret)
 949                                         goto done;
 950                         }
 951
 952                         info->var = *var;
 953
 954                         if (info->fbops->fb_set_par)
 955                                 info->fbops->fb_set_par(info);
 956
 957                         fb_pan_display(info, &info->var);
 958                         fb_set_cmap(&info->cmap, info);
 959                         fb_var_to_videomode(&mode, &info->var);
 960
 961                         if (info->modelist.prev && info->modelist.next &&
 962                             !list_empty(&info->modelist))
 963                                 ret = fb_add_videomode(&mode, &info->modelist);
 964
 965                         if (!ret && (flags & FBINFO_MISC_USEREVENT)) {
 966                                 struct fb_event event;
 967                                 int evnt = (activate & FB_ACTIVATE_ALL) ?
 968                                         FB_EVENT_MODE_CHANGE_ALL :
 969                                         FB_EVENT_MODE_CHANGE;
 970
 971                                 info->flags &= ~FBINFO_MISC_USEREVENT;
 972                                 event.info = info;
 973                                 event.data = &mode;
 974                                 fb_notifier_call_chain(evnt, &event);
 975                         }
 976                 }
 977         }
 978
 979  done:
 980         return ret;
 981 }
 982
 983 int
 984 fb_blank(struct fb_info *info, int blank)
 985 {
 986         int ret = -EINVAL;
 987
 988         if (blank > FB_BLANK_POWERDOWN)
 989                 blank = FB_BLANK_POWERDOWN;
 990
 991         if (info->fbops->fb_blank)
 992                 ret = info->fbops->fb_blank(blank, info);
 993
 994         if (!ret) {
 995                 struct fb_event event;
 996
 997                 event.info = info;
 998                 event.data = &blank;
 999                 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
1000         }
1001
1002         return ret;
1003 }
1004
1005 static int
1006 fb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
1007          unsigned long arg)
1008 {
1009         int fbidx = iminor(inode);
1010         struct fb_info *info = registered_fb[fbidx];
1011         struct fb_ops *fb = info->fbops;
1012         struct fb_var_screeninfo var;
1013         struct fb_fix_screeninfo fix;
1014         struct fb_con2fbmap con2fb;
1015         struct fb_cmap_user cmap;
1016         struct fb_event event;
1017         void __user *argp = (void __user *)arg;
1018         int i;
1019
1020         if (!fb)
1021                 return -ENODEV;
1022         switch (cmd) {
1023         case FBIOGET_VSCREENINFO:
1024                 return copy_to_user(argp, &info->var,
1025                                     sizeof(var)) ? -EFAULT : 0;
1026         case FBIOPUT_VSCREENINFO:
1027                 if (copy_from_user(&var, argp, sizeof(var)))
1028                         return -EFAULT;
1029                 acquire_console_sem();
1030                 info->flags |= FBINFO_MISC_USEREVENT;
1031                 i = fb_set_var(info, &var);
1032                 info->flags &= ~FBINFO_MISC_USEREVENT;
1033                 release_console_sem();
1034                 if (i) return i;
1035                 if (copy_to_user(argp, &var, sizeof(var)))
1036                         return -EFAULT;
1037                 return 0;
1038         case FBIOGET_FSCREENINFO:
1039                 return copy_to_user(argp, &info->fix,
1040                                     sizeof(fix)) ? -EFAULT : 0;
1041         case FBIOPUTCMAP:
1042                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1043                         return -EFAULT;
1044                 return (fb_set_user_cmap(&cmap, info));
1045         case FBIOGETCMAP:
1046                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1047                         return -EFAULT;
1048                 return fb_cmap_to_user(&info->cmap, &cmap);
1049         case FBIOPAN_DISPLAY:
1050                 if (copy_from_user(&var, argp, sizeof(var)))
1051                         return -EFAULT;
1052                 acquire_console_sem();
1053                 i = fb_pan_display(info, &var);
1054                 release_console_sem();
1055                 if (i)
1056                         return i;
1057                 if (copy_to_user(argp, &var, sizeof(var)))
1058                         return -EFAULT;
1059                 return 0;
1060         case FBIO_CURSOR:
1061                 return -EINVAL;
1062         case FBIOGET_CON2FBMAP:
1063                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1064                         return -EFAULT;
1065                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1066                     return -EINVAL;
1067                 con2fb.framebuffer = -1;
1068                 event.info = info;
1069                 event.data = &con2fb;
1070                 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
1071                 return copy_to_user(argp, &con2fb,
1072                                     sizeof(con2fb)) ? -EFAULT : 0;
1073         case FBIOPUT_CON2FBMAP:
1074                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1075                         return - EFAULT;
1076                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1077                     return -EINVAL;
1078                 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
1079                     return -EINVAL;
1080                 if (!registered_fb[con2fb.framebuffer])
1081                     request_module("fb%d", con2fb.framebuffer);
1082                 if (!registered_fb[con2fb.framebuffer])
1083                     return -EINVAL;
1084                 event.info = info;
1085                 event.data = &con2fb;
1086                 return fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP,
1087                                               &event);
1088         case FBIOBLANK:
1089                 acquire_console_sem();
1090                 info->flags |= FBINFO_MISC_USEREVENT;
1091                 i = fb_blank(info, arg);
1092                 info->flags &= ~FBINFO_MISC_USEREVENT;
1093                 release_console_sem();
1094                 return i;
1095         default:
1096                 if (fb->fb_ioctl == NULL)
1097                         return -EINVAL;
1098                 return fb->fb_ioctl(info, cmd, arg);
1099         }
1100 }
1101
1102 #ifdef CONFIG_COMPAT
1103 struct fb_fix_screeninfo32 {
1104         char                    id[16];
1105         compat_caddr_t          smem_start;
1106         u32                     smem_len;
1107         u32                     type;
1108         u32                     type_aux;
1109         u32                     visual;
1110         u16                     xpanstep;
1111         u16                     ypanstep;
1112         u16                     ywrapstep;
1113         u32                     line_length;
1114         compat_caddr_t          mmio_start;
1115         u32                     mmio_len;
1116         u32                     accel;
1117         u16                     reserved[3];
1118 };
1119
1120 struct fb_cmap32 {
1121         u32                     start;
1122         u32                     len;
1123         compat_caddr_t  red;
1124         compat_caddr_t  green;
1125         compat_caddr_t  blue;
1126         compat_caddr_t  transp;
1127 };
1128
1129 static int fb_getput_cmap(struct inode *inode, struct file *file,
1130                         unsigned int cmd, unsigned long arg)
1131 {
1132         struct fb_cmap_user __user *cmap;
1133         struct fb_cmap32 __user *cmap32;
1134         __u32 data;
1135         int err;
1136
1137         cmap = compat_alloc_user_space(sizeof(*cmap));
1138         cmap32 = compat_ptr(arg);
1139
1140         if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1141                 return -EFAULT;
1142
1143         if (get_user(data, &cmap32->red) ||
1144             put_user(compat_ptr(data), &cmap->red) ||
1145             get_user(data, &cmap32->green) ||
1146             put_user(compat_ptr(data), &cmap->green) ||
1147             get_user(data, &cmap32->blue) ||
1148             put_user(compat_ptr(data), &cmap->blue) ||
1149             get_user(data, &cmap32->transp) ||
1150             put_user(compat_ptr(data), &cmap->transp))
1151                 return -EFAULT;
1152
1153         err = fb_ioctl(inode, file, cmd, (unsigned long) cmap);
1154
1155         if (!err) {
1156                 if (copy_in_user(&cmap32->start,
1157                                  &cmap->start,
1158                                  2 * sizeof(__u32)))
1159                         err = -EFAULT;
1160         }
1161         return err;
1162 }
1163
1164 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1165                                   struct fb_fix_screeninfo32 __user *fix32)
1166 {
1167         __u32 data;
1168         int err;
1169
1170         err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1171
1172         data = (__u32) (unsigned long) fix->smem_start;
1173         err |= put_user(data, &fix32->smem_start);
1174
1175         err |= put_user(fix->smem_len, &fix32->smem_len);
1176         err |= put_user(fix->type, &fix32->type);
1177         err |= put_user(fix->type_aux, &fix32->type_aux);
1178         err |= put_user(fix->visual, &fix32->visual);
1179         err |= put_user(fix->xpanstep, &fix32->xpanstep);
1180         err |= put_user(fix->ypanstep, &fix32->ypanstep);
1181         err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1182         err |= put_user(fix->line_length, &fix32->line_length);
1183
1184         data = (__u32) (unsigned long) fix->mmio_start;
1185         err |= put_user(data, &fix32->mmio_start);
1186
1187         err |= put_user(fix->mmio_len, &fix32->mmio_len);
1188         err |= put_user(fix->accel, &fix32->accel);
1189         err |= copy_to_user(fix32->reserved, fix->reserved,
1190                             sizeof(fix->reserved));
1191
1192         return err;
1193 }
1194
1195 static int fb_get_fscreeninfo(struct inode *inode, struct file *file,
1196                                 unsigned int cmd, unsigned long arg)
1197 {
1198         mm_segment_t old_fs;
1199         struct fb_fix_screeninfo fix;
1200         struct fb_fix_screeninfo32 __user *fix32;
1201         int err;
1202
1203         fix32 = compat_ptr(arg);
1204
1205         old_fs = get_fs();
1206         set_fs(KERNEL_DS);
1207         err = fb_ioctl(inode, file, cmd, (unsigned long) &fix);
1208         set_fs(old_fs);
1209
1210         if (!err)
1211                 err = do_fscreeninfo_to_user(&fix, fix32);
1212
1213         return err;
1214 }
1215
1216 static long
1217 fb_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1218 {
1219         struct inode *inode = file->f_path.dentry->d_inode;
1220         int fbidx = iminor(inode);
1221         struct fb_info *info = registered_fb[fbidx];
1222         struct fb_ops *fb = info->fbops;
1223         long ret = -ENOIOCTLCMD;
1224
1225         lock_kernel();
1226         switch(cmd) {
1227         case FBIOGET_VSCREENINFO:
1228         case FBIOPUT_VSCREENINFO:
1229         case FBIOPAN_DISPLAY:
1230         case FBIOGET_CON2FBMAP:
1231         case FBIOPUT_CON2FBMAP:
1232                 arg = (unsigned long) compat_ptr(arg);
1233         case FBIOBLANK:
1234                 ret = fb_ioctl(inode, file, cmd, arg);
1235                 break;
1236
1237         case FBIOGET_FSCREENINFO:
1238                 ret = fb_get_fscreeninfo(inode, file, cmd, arg);
1239                 break;
1240
1241         case FBIOGETCMAP:
1242         case FBIOPUTCMAP:
1243                 ret = fb_getput_cmap(inode, file, cmd, arg);
1244                 break;
1245
1246         default:
1247                 if (fb->fb_compat_ioctl)
1248                         ret = fb->fb_compat_ioctl(info, cmd, arg);
1249                 break;
1250         }
1251         unlock_kernel();
1252         return ret;
1253 }
1254 #endif
1255
1256 static int
1257 fb_mmap(struct file *file, struct vm_area_struct * vma)
1258 {
1259         int fbidx = iminor(file->f_path.dentry->d_inode);
1260         struct fb_info *info = registered_fb[fbidx];
1261         struct fb_ops *fb = info->fbops;
1262         unsigned long off;
1263         unsigned long start;
1264         u32 len;
1265
1266         if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
1267                 return -EINVAL;
1268         off = vma->vm_pgoff << PAGE_SHIFT;
1269         if (!fb)
1270                 return -ENODEV;
1271         if (fb->fb_mmap) {
1272                 int res;
1273                 lock_kernel();
1274                 res = fb->fb_mmap(info, vma);
1275                 unlock_kernel();
1276                 return res;
1277         }
1278
1279         lock_kernel();
1280
1281         /* frame buffer memory */
1282         start = info->fix.smem_start;
1283         len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
1284         if (off >= len) {
1285                 /* memory mapped io */
1286                 off -= len;
1287                 if (info->var.accel_flags) {
1288                         unlock_kernel();
1289                         return -EINVAL;
1290                 }
1291                 start = info->fix.mmio_start;
1292                 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
1293         }
1294         unlock_kernel();
1295         start &= PAGE_MASK;
1296         if ((vma->vm_end - vma->vm_start + off) > len)
1297                 return -EINVAL;
1298         off += start;
1299         vma->vm_pgoff = off >> PAGE_SHIFT;
1300         /* This is an IO map - tell maydump to skip this VMA */
1301         vma->vm_flags |= VM_IO | VM_RESERVED;
1302         fb_pgprotect(file, vma, off);
1303         if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1304                              vma->vm_end - vma->vm_start, vma->vm_page_prot))
1305                 return -EAGAIN;
1306         return 0;
1307 }
1308
1309 static int
1310 fb_open(struct inode *inode, struct file *file)
1311 {
1312         int fbidx = iminor(inode);
1313         struct fb_info *info;
1314         int res = 0;
1315
1316         if (fbidx >= FB_MAX)
1317                 return -ENODEV;
1318         lock_kernel();
1319         if (!(info = registered_fb[fbidx]))
1320                 request_module("fb%d", fbidx);
1321         if (!(info = registered_fb[fbidx])) {
1322                 res = -ENODEV;
1323                 goto out;
1324         }
1325         if (!try_module_get(info->fbops->owner)) {
1326                 res = -ENODEV;
1327                 goto out;
1328         }
1329         file->private_data = info;
1330         if (info->fbops->fb_open) {
1331                 res = info->fbops->fb_open(info,1);
1332                 if (res)
1333                         module_put(info->fbops->owner);
1334         }
1335 #ifdef CONFIG_FB_DEFERRED_IO
1336         if (info->fbdefio)
1337                 fb_deferred_io_open(info, inode, file);
1338 #endif
1339 out:
1340         unlock_kernel();
1341         return res;
1342 }
1343
1344 static int
1345 fb_release(struct inode *inode, struct file *file)
1346 {
1347         struct fb_info * const info = file->private_data;
1348
1349         lock_kernel();
1350         if (info->fbops->fb_release)
1351                 info->fbops->fb_release(info,1);
1352         module_put(info->fbops->owner);
1353         unlock_kernel();
1354         return 0;
1355 }
1356
1357 static const struct file_operations fb_fops = {
1358         .owner =        THIS_MODULE,
1359         .read =         fb_read,
1360         .write =        fb_write,
1361         .ioctl =        fb_ioctl,
1362 #ifdef CONFIG_COMPAT
1363         .compat_ioctl = fb_compat_ioctl,
1364 #endif
1365         .mmap =         fb_mmap,
1366         .open =         fb_open,
1367         .release =      fb_release,
1368 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1369         .get_unmapped_area = get_fb_unmapped_area,
1370 #endif
1371 #ifdef CONFIG_FB_DEFERRED_IO
1372         .fsync =        fb_deferred_io_fsync,
1373 #endif
1374 };
1375
1376 struct class *fb_class;
1377 EXPORT_SYMBOL(fb_class);
1378
1379 static int fb_check_foreignness(struct fb_info *fi)
1380 {
1381         const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN;
1382
1383         fi->flags &= ~FBINFO_FOREIGN_ENDIAN;
1384
1385 #ifdef __BIG_ENDIAN
1386         fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH;
1387 #else
1388         fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0;
1389 #endif /* __BIG_ENDIAN */
1390
1391         if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) {
1392                 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to "
1393                        "support this framebuffer\n", fi->fix.id);
1394                 return -ENOSYS;
1395         } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) {
1396                 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to "
1397                        "support this framebuffer\n", fi->fix.id);
1398                 return -ENOSYS;
1399         }
1400
1401         return 0;
1402 }
1403
1404 /**
1405  *      register_framebuffer - registers a frame buffer device
1406  *      @fb_info: frame buffer info structure
1407  *
1408  *      Registers a frame buffer device @fb_info.
1409  *
1410  *      Returns negative errno on error, or zero for success.
1411  *
1412  */
1413
1414 int
1415 register_framebuffer(struct fb_info *fb_info)
1416 {
1417         int i;
1418         struct fb_event event;
1419         struct fb_videomode mode;
1420
1421         if (num_registered_fb == FB_MAX)
1422                 return -ENXIO;
1423
1424         if (fb_check_foreignness(fb_info))
1425                 return -ENOSYS;
1426
1427         num_registered_fb++;
1428         for (i = 0 ; i < FB_MAX; i++)
1429                 if (!registered_fb[i])
1430                         break;
1431         fb_info->node = i;
1432
1433         fb_info->dev = device_create_drvdata(fb_class, fb_info->device,
1434                                              MKDEV(FB_MAJOR, i), NULL,
1435                                              "fb%d", i);
1436         if (IS_ERR(fb_info->dev)) {
1437                 /* Not fatal */
1438                 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1439                 fb_info->dev = NULL;
1440         } else
1441                 fb_init_device(fb_info);
1442
1443         if (fb_info->pixmap.addr == NULL) {
1444                 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1445                 if (fb_info->pixmap.addr) {
1446                         fb_info->pixmap.size = FBPIXMAPSIZE;
1447                         fb_info->pixmap.buf_align = 1;
1448                         fb_info->pixmap.scan_align = 1;
1449                         fb_info->pixmap.access_align = 32;
1450                         fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1451                 }
1452         }
1453         fb_info->pixmap.offset = 0;
1454
1455         if (!fb_info->pixmap.blit_x)
1456                 fb_info->pixmap.blit_x = ~(u32)0;
1457
1458         if (!fb_info->pixmap.blit_y)
1459                 fb_info->pixmap.blit_y = ~(u32)0;
1460
1461         if (!fb_info->modelist.prev || !fb_info->modelist.next)
1462                 INIT_LIST_HEAD(&fb_info->modelist);
1463
1464         fb_var_to_videomode(&mode, &fb_info->var);
1465         fb_add_videomode(&mode, &fb_info->modelist);
1466         registered_fb[i] = fb_info;
1467
1468         event.info = fb_info;
1469         fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1470         return 0;
1471 }
1472
1473
1474 /**
1475  *      unregister_framebuffer - releases a frame buffer device
1476  *      @fb_info: frame buffer info structure
1477  *
1478  *      Unregisters a frame buffer device @fb_info.
1479  *
1480  *      Returns negative errno on error, or zero for success.
1481  *
1482  *      This function will also notify the framebuffer console
1483  *      to release the driver.
1484  *
1485  *      This is meant to be called within a driver's module_exit()
1486  *      function. If this is called outside module_exit(), ensure
1487  *      that the driver implements fb_open() and fb_release() to
1488  *      check that no processes are using the device.
1489  */
1490
1491 int
1492 unregister_framebuffer(struct fb_info *fb_info)
1493 {
1494         struct fb_event event;
1495         int i, ret = 0;
1496
1497         i = fb_info->node;
1498         if (!registered_fb[i]) {
1499                 ret = -EINVAL;
1500                 goto done;
1501         }
1502
1503         event.info = fb_info;
1504         ret = fb_notifier_call_chain(FB_EVENT_FB_UNBIND, &event);
1505
1506         if (ret) {
1507                 ret = -EINVAL;
1508                 goto done;
1509         }
1510
1511         if (fb_info->pixmap.addr &&
1512             (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1513                 kfree(fb_info->pixmap.addr);
1514         fb_destroy_modelist(&fb_info->modelist);
1515         registered_fb[i]=NULL;
1516         num_registered_fb--;
1517         fb_cleanup_device(fb_info);
1518         device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1519         event.info = fb_info;
1520         fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1521 done:
1522         return ret;
1523 }
1524
1525 /**
1526  *      fb_set_suspend - low level driver signals suspend
1527  *      @info: framebuffer affected
1528  *      @state: 0 = resuming, !=0 = suspending
1529  *
1530  *      This is meant to be used by low level drivers to
1531  *      signal suspend/resume to the core & clients.
1532  *      It must be called with the console semaphore held
1533  */
1534 void fb_set_suspend(struct fb_info *info, int state)
1535 {
1536         struct fb_event event;
1537
1538         event.info = info;
1539         if (state) {
1540                 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event);
1541                 info->state = FBINFO_STATE_SUSPENDED;
1542         } else {
1543                 info->state = FBINFO_STATE_RUNNING;
1544                 fb_notifier_call_chain(FB_EVENT_RESUME, &event);
1545         }
1546 }
1547
1548 /**
1549  *      fbmem_init - init frame buffer subsystem
1550  *
1551  *      Initialize the frame buffer subsystem.
1552  *
1553  *      NOTE: This function is _only_ to be called by drivers/char/mem.c.
1554  *
1555  */
1556
1557 static int __init
1558 fbmem_init(void)
1559 {
1560         proc_create("fb", 0, NULL, &fb_proc_fops);
1561
1562         if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1563                 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1564
1565         fb_class = class_create(THIS_MODULE, "graphics");
1566         if (IS_ERR(fb_class)) {
1567                 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1568                 fb_class = NULL;
1569         }
1570         return 0;
1571 }
1572
1573 #ifdef MODULE
1574 module_init(fbmem_init);
1575 static void __exit
1576 fbmem_exit(void)
1577 {
1578         remove_proc_entry("fb", NULL);
1579         class_destroy(fb_class);
1580         unregister_chrdev(FB_MAJOR, "fb");
1581 }
1582
1583 module_exit(fbmem_exit);
1584 MODULE_LICENSE("GPL");
1585 MODULE_DESCRIPTION("Framebuffer base");
1586 #else
1587 subsys_initcall(fbmem_init);
1588 #endif
1589
1590 int fb_new_modelist(struct fb_info *info)
1591 {
1592         struct fb_event event;
1593         struct fb_var_screeninfo var = info->var;
1594         struct list_head *pos, *n;
1595         struct fb_modelist *modelist;
1596         struct fb_videomode *m, mode;
1597         int err = 1;
1598
1599         list_for_each_safe(pos, n, &info->modelist) {
1600                 modelist = list_entry(pos, struct fb_modelist, list);
1601                 m = &modelist->mode;
1602                 fb_videomode_to_var(&var, m);
1603                 var.activate = FB_ACTIVATE_TEST;
1604                 err = fb_set_var(info, &var);
1605                 fb_var_to_videomode(&mode, &var);
1606                 if (err || !fb_mode_is_equal(m, &mode)) {
1607                         list_del(pos);
1608                         kfree(pos);
1609                 }
1610         }
1611
1612         err = 1;
1613
1614         if (!list_empty(&info->modelist)) {
1615                 event.info = info;
1616                 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
1617         }
1618
1619         return err;
1620 }
1621
1622 static char *video_options[FB_MAX] __read_mostly;
1623 static int ofonly __read_mostly;
1624
1625 /**
1626  * fb_get_options - get kernel boot parameters
1627  * @name:   framebuffer name as it would appear in
1628  *          the boot parameter line
1629  *          (video=<name>:<options>)
1630  * @option: the option will be stored here
1631  *
1632  * NOTE: Needed to maintain backwards compatibility
1633  */
1634 int fb_get_options(char *name, char **option)
1635 {
1636         char *opt, *options = NULL;
1637         int opt_len, retval = 0;
1638         int name_len = strlen(name), i;
1639
1640         if (name_len && ofonly && strncmp(name, "offb", 4))
1641                 retval = 1;
1642
1643         if (name_len && !retval) {
1644                 for (i = 0; i < FB_MAX; i++) {
1645                         if (video_options[i] == NULL)
1646                                 continue;
1647                         opt_len = strlen(video_options[i]);
1648                         if (!opt_len)
1649                                 continue;
1650                         opt = video_options[i];
1651                         if (!strncmp(name, opt, name_len) &&
1652                             opt[name_len] == ':')
1653                                 options = opt + name_len + 1;
1654                 }
1655         }
1656         if (options && !strncmp(options, "off", 3))
1657                 retval = 1;
1658
1659         if (option)
1660                 *option = options;
1661
1662         return retval;
1663 }
1664
1665 #ifndef MODULE
1666 /**
1667  *      video_setup - process command line options
1668  *      @options: string of options
1669  *
1670  *      Process command line options for frame buffer subsystem.
1671  *
1672  *      NOTE: This function is a __setup and __init function.
1673  *            It only stores the options.  Drivers have to call
1674  *            fb_get_options() as necessary.
1675  *
1676  *      Returns zero.
1677  *
1678  */
1679 static int __init video_setup(char *options)
1680 {
1681         int i, global = 0;
1682
1683         if (!options || !*options)
1684                 global = 1;
1685
1686         if (!global && !strncmp(options, "ofonly", 6)) {
1687                 ofonly = 1;
1688                 global = 1;
1689         }
1690
1691         if (!global && !strstr(options, "fb:")) {
1692                 fb_mode_option = options;
1693                 global = 1;
1694         }
1695
1696         if (!global) {
1697                 for (i = 0; i < FB_MAX; i++) {
1698                         if (video_options[i] == NULL) {
1699                                 video_options[i] = options;
1700                                 break;
1701                         }
1702
1703                 }
1704         }
1705
1706         return 1;
1707 }
1708 __setup("video=", video_setup);
1709 #endif
1710
1711     /*
1712      *  Visible symbols for modules
1713      */
1714
1715 EXPORT_SYMBOL(register_framebuffer);
1716 EXPORT_SYMBOL(unregister_framebuffer);
1717 EXPORT_SYMBOL(num_registered_fb);
1718 EXPORT_SYMBOL(registered_fb);
1719 EXPORT_SYMBOL(fb_show_logo);
1720 EXPORT_SYMBOL(fb_set_var);
1721 EXPORT_SYMBOL(fb_blank);
1722 EXPORT_SYMBOL(fb_pan_display);
1723 EXPORT_SYMBOL(fb_get_buffer_offset);
1724 EXPORT_SYMBOL(fb_set_suspend);
1725 EXPORT_SYMBOL(fb_get_options);
1726
1727 MODULE_LICENSE("GPL");