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/console.h>
  30 #ifdef CONFIG_KMOD
  31 #include <linux/kmod.h>
  32 #endif
  33 #include <linux/err.h>
  34 #include <linux/device.h>
  35 #include <linux/efi.h>
  36 #include <linux/fb.h>
  37
  38 #include <asm/fb.h>
  39
  40
  41     /*
  42      *  Frame buffer device initialization and setup routines
  43      */
  44
  45 #define FBPIXMAPSIZE    (1024 * 8)
  46
  47 struct fb_info *registered_fb[FB_MAX] __read_mostly;
  48 int num_registered_fb __read_mostly;
  49
  50 /*
  51  * Helpers
  52  */
  53
  54 int fb_get_color_depth(struct fb_var_screeninfo *var,
  55                        struct fb_fix_screeninfo *fix)
  56 {
  57         int depth = 0;
  58
  59         if (fix->visual == FB_VISUAL_MONO01 ||
  60             fix->visual == FB_VISUAL_MONO10)
  61                 depth = 1;
  62         else {
  63                 if (var->green.length == var->blue.length &&
  64                     var->green.length == var->red.length &&
  65                     var->green.offset == var->blue.offset &&
  66                     var->green.offset == var->red.offset)
  67                         depth = var->green.length;
  68                 else
  69                         depth = var->green.length + var->red.length +
  70                                 var->blue.length;
  71         }
  72
  73         return depth;
  74 }
  75 EXPORT_SYMBOL(fb_get_color_depth);
  76
  77 /*
  78  * Data padding functions.
  79  */
  80 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
  81 {
  82         __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
  83 }
  84 EXPORT_SYMBOL(fb_pad_aligned_buffer);
  85
  86 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
  87                                 u32 shift_high, u32 shift_low, u32 mod)
  88 {
  89         u8 mask = (u8) (0xfff << shift_high), tmp;
  90         int i, j;
  91
  92         for (i = height; i--; ) {
  93                 for (j = 0; j < idx; j++) {
  94                         tmp = dst[j];
  95                         tmp &= mask;
  96                         tmp |= *src >> shift_low;
  97                         dst[j] = tmp;
  98                         tmp = *src << shift_high;
  99                         dst[j+1] = tmp;
 100                         src++;
 101                 }
 102                 tmp = dst[idx];
 103                 tmp &= mask;
 104                 tmp |= *src >> shift_low;
 105                 dst[idx] = tmp;
 106                 if (shift_high < mod) {
 107                         tmp = *src << shift_high;
 108                         dst[idx+1] = tmp;
 109                 }
 110                 src++;
 111                 dst += d_pitch;
 112         }
 113 }
 114 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
 115
 116 /*
 117  * we need to lock this section since fb_cursor
 118  * may use fb_imageblit()
 119  */
 120 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
 121 {
 122         u32 align = buf->buf_align - 1, offset;
 123         char *addr = buf->addr;
 124
 125         /* If IO mapped, we need to sync before access, no sharing of
 126          * the pixmap is done
 127          */
 128         if (buf->flags & FB_PIXMAP_IO) {
 129                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 130                         info->fbops->fb_sync(info);
 131                 return addr;
 132         }
 133
 134         /* See if we fit in the remaining pixmap space */
 135         offset = buf->offset + align;
 136         offset &= ~align;
 137         if (offset + size > buf->size) {
 138                 /* We do not fit. In order to be able to re-use the buffer,
 139                  * we must ensure no asynchronous DMA'ing or whatever operation
 140                  * is in progress, we sync for that.
 141                  */
 142                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 143                         info->fbops->fb_sync(info);
 144                 offset = 0;
 145         }
 146         buf->offset = offset + size;
 147         addr += offset;
 148
 149         return addr;
 150 }
 151
 152 #ifdef CONFIG_LOGO
 153
 154 static inline unsigned safe_shift(unsigned d, int n)
 155 {
 156         return n < 0 ? d >> -n : d << n;
 157 }
 158
 159 static void fb_set_logocmap(struct fb_info *info,
 160                                    const struct linux_logo *logo)
 161 {
 162         struct fb_cmap palette_cmap;
 163         u16 palette_green[16];
 164         u16 palette_blue[16];
 165         u16 palette_red[16];
 166         int i, j, n;
 167         const unsigned char *clut = logo->clut;
 168
 169         palette_cmap.start = 0;
 170         palette_cmap.len = 16;
 171         palette_cmap.red = palette_red;
 172         palette_cmap.green = palette_green;
 173         palette_cmap.blue = palette_blue;
 174         palette_cmap.transp = NULL;
 175
 176         for (i = 0; i < logo->clutsize; i += n) {
 177                 n = logo->clutsize - i;
 178                 /* palette_cmap provides space for only 16 colors at once */
 179                 if (n > 16)
 180                         n = 16;
 181                 palette_cmap.start = 32 + i;
 182                 palette_cmap.len = n;
 183                 for (j = 0; j < n; ++j) {
 184                         palette_cmap.red[j] = clut[0] << 8 | clut[0];
 185                         palette_cmap.green[j] = clut[1] << 8 | clut[1];
 186                         palette_cmap.blue[j] = clut[2] << 8 | clut[2];
 187                         clut += 3;
 188                 }
 189                 fb_set_cmap(&palette_cmap, info);
 190         }
 191 }
 192
 193 static void  fb_set_logo_truepalette(struct fb_info *info,
 194                                             const struct linux_logo *logo,
 195                                             u32 *palette)
 196 {
 197         static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
 198         unsigned char redmask, greenmask, bluemask;
 199         int redshift, greenshift, blueshift;
 200         int i;
 201         const unsigned char *clut = logo->clut;
 202
 203         /*
 204          * We have to create a temporary palette since console palette is only
 205          * 16 colors long.
 206          */
 207         /* Bug: Doesn't obey msb_right ... (who needs that?) */
 208         redmask   = mask[info->var.red.length   < 8 ? info->var.red.length   : 8];
 209         greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
 210         bluemask  = mask[info->var.blue.length  < 8 ? info->var.blue.length  : 8];
 211         redshift   = info->var.red.offset   - (8 - info->var.red.length);
 212         greenshift = info->var.green.offset - (8 - info->var.green.length);
 213         blueshift  = info->var.blue.offset  - (8 - info->var.blue.length);
 214
 215         for ( i = 0; i < logo->clutsize; i++) {
 216                 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
 217                                  safe_shift((clut[1] & greenmask), greenshift) |
 218                                  safe_shift((clut[2] & bluemask), blueshift));
 219                 clut += 3;
 220         }
 221 }
 222
 223 static void fb_set_logo_directpalette(struct fb_info *info,
 224                                              const struct linux_logo *logo,
 225                                              u32 *palette)
 226 {
 227         int redshift, greenshift, blueshift;
 228         int i;
 229
 230         redshift = info->var.red.offset;
 231         greenshift = info->var.green.offset;
 232         blueshift = info->var.blue.offset;
 233
 234         for (i = 32; i < logo->clutsize; i++)
 235                 palette[i] = i << redshift | i << greenshift | i << blueshift;
 236 }
 237
 238 static void fb_set_logo(struct fb_info *info,
 239                                const struct linux_logo *logo, u8 *dst,
 240                                int depth)
 241 {
 242         int i, j, k;
 243         const u8 *src = logo->data;
 244         u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
 245         u8 fg = 1, d;
 246
 247         if (fb_get_color_depth(&info->var, &info->fix) == 3)
 248                 fg = 7;
 249
 250         if (info->fix.visual == FB_VISUAL_MONO01 ||
 251             info->fix.visual == FB_VISUAL_MONO10)
 252                 fg = ~((u8) (0xfff << info->var.green.length));
 253
 254         switch (depth) {
 255         case 4:
 256                 for (i = 0; i < logo->height; i++)
 257                         for (j = 0; j < logo->width; src++) {
 258                                 *dst++ = *src >> 4;
 259                                 j++;
 260                                 if (j < logo->width) {
 261                                         *dst++ = *src & 0x0f;
 262                                         j++;
 263                                 }
 264                         }
 265                 break;
 266         case 1:
 267                 for (i = 0; i < logo->height; i++) {
 268                         for (j = 0; j < logo->width; src++) {
 269                                 d = *src ^ xor;
 270                                 for (k = 7; k >= 0; k--) {
 271                                         *dst++ = ((d >> k) & 1) ? fg : 0;
 272                                         j++;
 273                                 }
 274                         }
 275                 }
 276                 break;
 277         }
 278 }
 279
 280 /*
 281  * Three (3) kinds of logo maps exist.  linux_logo_clut224 (>16 colors),
 282  * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors).  Depending on
 283  * the visual format and color depth of the framebuffer, the DAC, the
 284  * pseudo_palette, and the logo data will be adjusted accordingly.
 285  *
 286  * Case 1 - linux_logo_clut224:
 287  * Color exceeds the number of console colors (16), thus we set the hardware DAC
 288  * using fb_set_cmap() appropriately.  The "needs_cmapreset"  flag will be set.
 289  *
 290  * For visuals that require color info from the pseudo_palette, we also construct
 291  * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
 292  * will be set.
 293  *
 294  * Case 2 - linux_logo_vga16:
 295  * The number of colors just matches the console colors, thus there is no need
 296  * to set the DAC or the pseudo_palette.  However, the bitmap is packed, ie,
 297  * each byte contains color information for two pixels (upper and lower nibble).
 298  * To be consistent with fb_imageblit() usage, we therefore separate the two
 299  * nibbles into separate bytes. The "depth" flag will be set to 4.
 300  *
 301  * Case 3 - linux_logo_mono:
 302  * This is similar with Case 2.  Each byte contains information for 8 pixels.
 303  * We isolate each bit and expand each into a byte. The "depth" flag will
 304  * be set to 1.
 305  */
 306 static struct logo_data {
 307         int depth;
 308         int needs_directpalette;
 309         int needs_truepalette;
 310         int needs_cmapreset;
 311         const struct linux_logo *logo;
 312 } fb_logo __read_mostly;
 313
 314 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
 315 {
 316         u32 size = width * height, i;
 317
 318         out += size - 1;
 319
 320         for (i = size; i--; )
 321                 *out-- = *in++;
 322 }
 323
 324 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
 325 {
 326         int i, j, h = height - 1;
 327
 328         for (i = 0; i < height; i++)
 329                 for (j = 0; j < width; j++)
 330                                 out[height * j + h - i] = *in++;
 331 }
 332
 333 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
 334 {
 335         int i, j, w = width - 1;
 336
 337         for (i = 0; i < height; i++)
 338                 for (j = 0; j < width; j++)
 339                         out[height * (w - j) + i] = *in++;
 340 }
 341
 342 static void fb_rotate_logo(struct fb_info *info, u8 *dst,
 343                            struct fb_image *image, int rotate)
 344 {
 345         u32 tmp;
 346
 347         if (rotate == FB_ROTATE_UD) {
 348                 fb_rotate_logo_ud(image->data, dst, image->width,
 349                                   image->height);
 350                 image->dx = info->var.xres - image->width - image->dx;
 351                 image->dy = info->var.yres - image->height - image->dy;
 352         } else if (rotate == FB_ROTATE_CW) {
 353                 fb_rotate_logo_cw(image->data, dst, image->width,
 354                                   image->height);
 355                 tmp = image->width;
 356                 image->width = image->height;
 357                 image->height = tmp;
 358                 tmp = image->dy;
 359                 image->dy = image->dx;
 360                 image->dx = info->var.xres - image->width - tmp;
 361         } else if (rotate == FB_ROTATE_CCW) {
 362                 fb_rotate_logo_ccw(image->data, dst, image->width,
 363                                    image->height);
 364                 tmp = image->width;
 365                 image->width = image->height;
 366                 image->height = tmp;
 367                 tmp = image->dx;
 368                 image->dx = image->dy;
 369                 image->dy = info->var.yres - image->height - tmp;
 370         }
 371
 372         image->data = dst;
 373 }
 374
 375 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
 376                             int rotate, unsigned int num)
 377 {
 378         unsigned int x;
 379
 380         if (rotate == FB_ROTATE_UR) {
 381                 for (x = 0;
 382                      x < num && image->dx + image->width <= info->var.xres;
 383                      x++) {
 384                         info->fbops->fb_imageblit(info, image);
 385                         image->dx += image->width + 8;
 386                 }
 387         } else if (rotate == FB_ROTATE_UD) {
 388                 for (x = 0; x < num && image->dx >= 0; x++) {
 389                         info->fbops->fb_imageblit(info, image);
 390                         image->dx -= image->width + 8;
 391                 }
 392         } else if (rotate == FB_ROTATE_CW) {
 393                 for (x = 0;
 394                      x < num && image->dy + image->height <= info->var.yres;
 395                      x++) {
 396                         info->fbops->fb_imageblit(info, image);
 397                         image->dy += image->height + 8;
 398                 }
 399         } else if (rotate == FB_ROTATE_CCW) {
 400                 for (x = 0; x < num && image->dy >= 0; x++) {
 401                         info->fbops->fb_imageblit(info, image);
 402                         image->dy -= image->height + 8;
 403                 }
 404         }
 405 }
 406
 407 static int fb_show_logo_line(struct fb_info *info, int rotate,
 408                              const struct linux_logo *logo, int y,
 409                              unsigned int n)
 410 {
 411         u32 *palette = NULL, *saved_pseudo_palette = NULL;
 412         unsigned char *logo_new = NULL, *logo_rotate = NULL;
 413         struct fb_image image;
 414
 415         /* Return if the frame buffer is not mapped or suspended */
 416         if (logo == NULL || info->state != FBINFO_STATE_RUNNING ||
 417             info->flags & FBINFO_MODULE)
 418                 return 0;
 419
 420         image.depth = 8;
 421         image.data = logo->data;
 422
 423         if (fb_logo.needs_cmapreset)
 424                 fb_set_logocmap(info, logo);
 425
 426         if (fb_logo.needs_truepalette ||
 427             fb_logo.needs_directpalette) {
 428                 palette = kmalloc(256 * 4, GFP_KERNEL);
 429                 if (palette == NULL)
 430                         return 0;
 431
 432                 if (fb_logo.needs_truepalette)
 433                         fb_set_logo_truepalette(info, logo, palette);
 434                 else
 435                         fb_set_logo_directpalette(info, logo, palette);
 436
 437                 saved_pseudo_palette = info->pseudo_palette;
 438                 info->pseudo_palette = palette;
 439         }
 440
 441         if (fb_logo.depth <= 4) {
 442                 logo_new = kmalloc(logo->width * logo->height, GFP_KERNEL);
 443                 if (logo_new == NULL) {
 444                         kfree(palette);
 445                         if (saved_pseudo_palette)
 446                                 info->pseudo_palette = saved_pseudo_palette;
 447                         return 0;
 448                 }
 449                 image.data = logo_new;
 450                 fb_set_logo(info, logo, logo_new, fb_logo.depth);
 451         }
 452
 453         image.dx = 0;
 454         image.dy = y;
 455         image.width = logo->width;
 456         image.height = logo->height;
 457
 458         if (rotate) {
 459                 logo_rotate = kmalloc(logo->width *
 460                                       logo->height, GFP_KERNEL);
 461                 if (logo_rotate)
 462                         fb_rotate_logo(info, logo_rotate, &image, rotate);
 463         }
 464
 465         fb_do_show_logo(info, &image, rotate, n);
 466
 467         kfree(palette);
 468         if (saved_pseudo_palette != NULL)
 469                 info->pseudo_palette = saved_pseudo_palette;
 470         kfree(logo_new);
 471         kfree(logo_rotate);
 472         return logo->height;
 473 }
 474
 475
 476 #ifdef CONFIG_FB_LOGO_EXTRA
 477
 478 #define FB_LOGO_EX_NUM_MAX 10
 479 static struct logo_data_extra {
 480         const struct linux_logo *logo;
 481         unsigned int n;
 482 } fb_logo_ex[FB_LOGO_EX_NUM_MAX];
 483 static unsigned int fb_logo_ex_num;
 484
 485 void fb_append_extra_logo(const struct linux_logo *logo, unsigned int n)
 486 {
 487         if (!n || fb_logo_ex_num == FB_LOGO_EX_NUM_MAX)
 488                 return;
 489
 490         fb_logo_ex[fb_logo_ex_num].logo = logo;
 491         fb_logo_ex[fb_logo_ex_num].n = n;
 492         fb_logo_ex_num++;
 493 }
 494
 495 static int fb_prepare_extra_logos(struct fb_info *info, unsigned int height,
 496                                   unsigned int yres)
 497 {
 498         unsigned int i;
 499
 500         /* FIXME: logo_ex supports only truecolor fb. */
 501         if (info->fix.visual != FB_VISUAL_TRUECOLOR)
 502                 fb_logo_ex_num = 0;
 503
 504         for (i = 0; i < fb_logo_ex_num; i++) {
 505                 height += fb_logo_ex[i].logo->height;
 506                 if (height > yres) {
 507                         height -= fb_logo_ex[i].logo->height;
 508                         fb_logo_ex_num = i;
 509                         break;
 510                 }
 511         }
 512         return height;
 513 }
 514
 515 static int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
 516 {
 517         unsigned int i;
 518
 519         for (i = 0; i < fb_logo_ex_num; i++)
 520                 y += fb_show_logo_line(info, rotate,
 521                                        fb_logo_ex[i].logo, y, fb_logo_ex[i].n);
 522
 523         return y;
 524 }
 525
 526 #else /* !CONFIG_FB_LOGO_EXTRA */
 527
 528 static inline int fb_prepare_extra_logos(struct fb_info *info,
 529                                          unsigned int height,
 530                                          unsigned int yres)
 531 {
 532         return height;
 533 }
 534
 535 static inline int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
 536 {
 537         return y;
 538 }
 539
 540 #endif /* CONFIG_FB_LOGO_EXTRA */
 541
 542
 543 int fb_prepare_logo(struct fb_info *info, int rotate)
 544 {
 545         int depth = fb_get_color_depth(&info->var, &info->fix);
 546         unsigned int yres;
 547
 548         memset(&fb_logo, 0, sizeof(struct logo_data));
 549
 550         if (info->flags & FBINFO_MISC_TILEBLITTING ||
 551             info->flags & FBINFO_MODULE)
 552                 return 0;
 553
 554         if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
 555                 depth = info->var.blue.length;
 556                 if (info->var.red.length < depth)
 557                         depth = info->var.red.length;
 558                 if (info->var.green.length < depth)
 559                         depth = info->var.green.length;
 560         }
 561
 562         if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) {
 563                 /* assume console colormap */
 564                 depth = 4;
 565         }
 566
 567         if (depth >= 8) {
 568                 switch (info->fix.visual) {
 569                 case FB_VISUAL_TRUECOLOR:
 570                         fb_logo.needs_truepalette = 1;
 571                         break;
 572                 case FB_VISUAL_DIRECTCOLOR:
 573                         fb_logo.needs_directpalette = 1;
 574                         fb_logo.needs_cmapreset = 1;
 575                         break;
 576                 case FB_VISUAL_PSEUDOCOLOR:
 577                         fb_logo.needs_cmapreset = 1;
 578                         break;
 579                 }
 580         }
 581
 582         /* Return if no suitable logo was found */
 583         fb_logo.logo = fb_find_logo(depth);
 584
 585         if (!fb_logo.logo) {
 586                 return 0;
 587         }
 588
 589         if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
 590                 yres = info->var.yres;
 591         else
 592                 yres = info->var.xres;
 593
 594         if (fb_logo.logo->height > yres) {
 595                 fb_logo.logo = NULL;
 596                 return 0;
 597         }
 598
 599         /* What depth we asked for might be different from what we get */
 600         if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
 601                 fb_logo.depth = 8;
 602         else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
 603                 fb_logo.depth = 4;
 604         else
 605                 fb_logo.depth = 1;
 606
 607         return fb_prepare_extra_logos(info, fb_logo.logo->height, yres);
 608 }
 609
 610 int fb_show_logo(struct fb_info *info, int rotate)
 611 {
 612         int y;
 613
 614         y = fb_show_logo_line(info, rotate, fb_logo.logo, 0,
 615                               num_online_cpus());
 616         y = fb_show_extra_logos(info, y, rotate);
 617
 618         return y;
 619 }
 620 #else
 621 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
 622 int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
 623 #endif /* CONFIG_LOGO */
 624
 625 static int fbmem_read_proc(char *buf, char **start, off_t offset,
 626                            int len, int *eof, void *private)
 627 {
 628         struct fb_info **fi;
 629         int clen;
 630
 631         clen = 0;
 632         for (fi = registered_fb; fi < &registered_fb[FB_MAX] && clen < 4000;
 633              fi++)
 634                 if (*fi)
 635                         clen += sprintf(buf + clen, "%d %s\n",
 636                                         (*fi)->node,
 637                                         (*fi)->fix.id);
 638         *start = buf + offset;
 639         if (clen > offset)
 640                 clen -= offset;
 641         else
 642                 clen = 0;
 643         return clen < len ? clen : len;
 644 }
 645
 646 static ssize_t
 647 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 648 {
 649         unsigned long p = *ppos;
 650         struct inode *inode = file->f_path.dentry->d_inode;
 651         int fbidx = iminor(inode);
 652         struct fb_info *info = registered_fb[fbidx];
 653         u32 *buffer, *dst;
 654         u32 __iomem *src;
 655         int c, i, cnt = 0, err = 0;
 656         unsigned long total_size;
 657
 658         if (!info || ! info->screen_base)
 659                 return -ENODEV;
 660
 661         if (info->state != FBINFO_STATE_RUNNING)
 662                 return -EPERM;
 663
 664         if (info->fbops->fb_read)
 665                 return info->fbops->fb_read(info, buf, count, ppos);
 666
 667         total_size = info->screen_size;
 668
 669         if (total_size == 0)
 670                 total_size = info->fix.smem_len;
 671
 672         if (p >= total_size)
 673                 return 0;
 674
 675         if (count >= total_size)
 676                 count = total_size;
 677
 678         if (count + p > total_size)
 679                 count = total_size - p;
 680
 681         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 682                          GFP_KERNEL);
 683         if (!buffer)
 684                 return -ENOMEM;
 685
 686         src = (u32 __iomem *) (info->screen_base + p);
 687
 688         if (info->fbops->fb_sync)
 689                 info->fbops->fb_sync(info);
 690
 691         while (count) {
 692                 c  = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 693                 dst = buffer;
 694                 for (i = c >> 2; i--; )
 695                         *dst++ = fb_readl(src++);
 696                 if (c & 3) {
 697                         u8 *dst8 = (u8 *) dst;
 698                         u8 __iomem *src8 = (u8 __iomem *) src;
 699
 700                         for (i = c & 3; i--;)
 701                                 *dst8++ = fb_readb(src8++);
 702
 703                         src = (u32 __iomem *) src8;
 704                 }
 705
 706                 if (copy_to_user(buf, buffer, c)) {
 707                         err = -EFAULT;
 708                         break;
 709                 }
 710                 *ppos += c;
 711                 buf += c;
 712                 cnt += c;
 713                 count -= c;
 714         }
 715
 716         kfree(buffer);
 717
 718         return (err) ? err : cnt;
 719 }
 720
 721 static ssize_t
 722 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 723 {
 724         unsigned long p = *ppos;
 725         struct inode *inode = file->f_path.dentry->d_inode;
 726         int fbidx = iminor(inode);
 727         struct fb_info *info = registered_fb[fbidx];
 728         u32 *buffer, *src;
 729         u32 __iomem *dst;
 730         int c, i, cnt = 0, err = 0;
 731         unsigned long total_size;
 732
 733         if (!info || !info->screen_base)
 734                 return -ENODEV;
 735
 736         if (info->state != FBINFO_STATE_RUNNING)
 737                 return -EPERM;
 738
 739         if (info->fbops->fb_write)
 740                 return info->fbops->fb_write(info, buf, count, ppos);
 741
 742         total_size = info->screen_size;
 743
 744         if (total_size == 0)
 745                 total_size = info->fix.smem_len;
 746
 747         if (p > total_size)
 748                 return -EFBIG;
 749
 750         if (count > total_size) {
 751                 err = -EFBIG;
 752                 count = total_size;
 753         }
 754
 755         if (count + p > total_size) {
 756                 if (!err)
 757                         err = -ENOSPC;
 758
 759                 count = total_size - p;
 760         }
 761
 762         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 763                          GFP_KERNEL);
 764         if (!buffer)
 765                 return -ENOMEM;
 766
 767         dst = (u32 __iomem *) (info->screen_base + p);
 768
 769         if (info->fbops->fb_sync)
 770                 info->fbops->fb_sync(info);
 771
 772         while (count) {
 773                 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 774                 src = buffer;
 775
 776                 if (copy_from_user(src, buf, c)) {
 777                         err = -EFAULT;
 778                         break;
 779                 }
 780
 781                 for (i = c >> 2; i--; )
 782                         fb_writel(*src++, dst++);
 783
 784                 if (c & 3) {
 785                         u8 *src8 = (u8 *) src;
 786                         u8 __iomem *dst8 = (u8 __iomem *) dst;
 787
 788                         for (i = c & 3; i--; )
 789                                 fb_writeb(*src8++, dst8++);
 790
 791                         dst = (u32 __iomem *) dst8;
 792                 }
 793
 794                 *ppos += c;
 795                 buf += c;
 796                 cnt += c;
 797                 count -= c;
 798         }
 799
 800         kfree(buffer);
 801
 802         return (cnt) ? cnt : err;
 803 }
 804
 805 #ifdef CONFIG_KMOD
 806 static void try_to_load(int fb)
 807 {
 808         request_module("fb%d", fb);
 809 }
 810 #endif /* CONFIG_KMOD */
 811
 812 int
 813 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
 814 {
 815         struct fb_fix_screeninfo *fix = &info->fix;
 816         int xoffset = var->xoffset;
 817         int yoffset = var->yoffset;
 818         int err = 0, yres = info->var.yres;
 819
 820         if (var->yoffset > 0) {
 821                 if (var->vmode & FB_VMODE_YWRAP) {
 822                         if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
 823                                 err = -EINVAL;
 824                         else
 825                                 yres = 0;
 826                 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
 827                         err = -EINVAL;
 828         }
 829
 830         if (var->xoffset > 0 && (!fix->xpanstep ||
 831                                  (var->xoffset % fix->xpanstep)))
 832                 err = -EINVAL;
 833
 834         if (err || !info->fbops->fb_pan_display || xoffset < 0 ||
 835             yoffset < 0 || var->yoffset + yres > info->var.yres_virtual ||
 836             var->xoffset + info->var.xres > info->var.xres_virtual)
 837                 return -EINVAL;
 838
 839         if ((err = info->fbops->fb_pan_display(var, info)))
 840                 return err;
 841         info->var.xoffset = var->xoffset;
 842         info->var.yoffset = var->yoffset;
 843         if (var->vmode & FB_VMODE_YWRAP)
 844                 info->var.vmode |= FB_VMODE_YWRAP;
 845         else
 846                 info->var.vmode &= ~FB_VMODE_YWRAP;
 847         return 0;
 848 }
 849
 850 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var,
 851                          u32 activate)
 852 {
 853         struct fb_event event;
 854         struct fb_blit_caps caps, fbcaps;
 855         int err = 0;
 856
 857         memset(&caps, 0, sizeof(caps));
 858         memset(&fbcaps, 0, sizeof(fbcaps));
 859         caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0;
 860         event.info = info;
 861         event.data = &caps;
 862         fb_notifier_call_chain(FB_EVENT_GET_REQ, &event);
 863         info->fbops->fb_get_caps(info, &fbcaps, var);
 864
 865         if (((fbcaps.x ^ caps.x) & caps.x) ||
 866             ((fbcaps.y ^ caps.y) & caps.y) ||
 867             (fbcaps.len < caps.len))
 868                 err = -EINVAL;
 869
 870         return err;
 871 }
 872
 873 int
 874 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
 875 {
 876         int flags = info->flags;
 877         int ret = 0;
 878
 879         if (var->activate & FB_ACTIVATE_INV_MODE) {
 880                 struct fb_videomode mode1, mode2;
 881
 882                 fb_var_to_videomode(&mode1, var);
 883                 fb_var_to_videomode(&mode2, &info->var);
 884                 /* make sure we don't delete the videomode of current var */
 885                 ret = fb_mode_is_equal(&mode1, &mode2);
 886
 887                 if (!ret) {
 888                     struct fb_event event;
 889
 890                     event.info = info;
 891                     event.data = &mode1;
 892                     ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event);
 893                 }
 894
 895                 if (!ret)
 896                     fb_delete_videomode(&mode1, &info->modelist);
 897
 898
 899                 ret = (ret) ? -EINVAL : 0;
 900                 goto done;
 901         }
 902
 903         if ((var->activate & FB_ACTIVATE_FORCE) ||
 904             memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
 905                 u32 activate = var->activate;
 906
 907                 if (!info->fbops->fb_check_var) {
 908                         *var = info->var;
 909                         goto done;
 910                 }
 911
 912                 ret = info->fbops->fb_check_var(var, info);
 913
 914                 if (ret)
 915                         goto done;
 916
 917                 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
 918                         struct fb_videomode mode;
 919
 920                         if (info->fbops->fb_get_caps) {
 921                                 ret = fb_check_caps(info, var, activate);
 922
 923                                 if (ret)
 924                                         goto done;
 925                         }
 926
 927                         info->var = *var;
 928
 929                         if (info->fbops->fb_set_par)
 930                                 info->fbops->fb_set_par(info);
 931
 932                         fb_pan_display(info, &info->var);
 933                         fb_set_cmap(&info->cmap, info);
 934                         fb_var_to_videomode(&mode, &info->var);
 935
 936                         if (info->modelist.prev && info->modelist.next &&
 937                             !list_empty(&info->modelist))
 938                                 ret = fb_add_videomode(&mode, &info->modelist);
 939
 940                         if (!ret && (flags & FBINFO_MISC_USEREVENT)) {
 941                                 struct fb_event event;
 942                                 int evnt = (activate & FB_ACTIVATE_ALL) ?
 943                                         FB_EVENT_MODE_CHANGE_ALL :
 944                                         FB_EVENT_MODE_CHANGE;
 945
 946                                 info->flags &= ~FBINFO_MISC_USEREVENT;
 947                                 event.info = info;
 948                                 fb_notifier_call_chain(evnt, &event);
 949                         }
 950                 }
 951         }
 952
 953  done:
 954         return ret;
 955 }
 956
 957 int
 958 fb_blank(struct fb_info *info, int blank)
 959 {
 960         int ret = -EINVAL;
 961
 962         if (blank > FB_BLANK_POWERDOWN)
 963                 blank = FB_BLANK_POWERDOWN;
 964
 965         if (info->fbops->fb_blank)
 966                 ret = info->fbops->fb_blank(blank, info);
 967
 968         if (!ret) {
 969                 struct fb_event event;
 970
 971                 event.info = info;
 972                 event.data = &blank;
 973                 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
 974         }
 975
 976         return ret;
 977 }
 978
 979 static int
 980 fb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
 981          unsigned long arg)
 982 {
 983         int fbidx = iminor(inode);
 984         struct fb_info *info = registered_fb[fbidx];
 985         struct fb_ops *fb = info->fbops;
 986         struct fb_var_screeninfo var;
 987         struct fb_fix_screeninfo fix;
 988         struct fb_con2fbmap con2fb;
 989         struct fb_cmap_user cmap;
 990         struct fb_event event;
 991         void __user *argp = (void __user *)arg;
 992         int i;
 993
 994         if (!fb)
 995                 return -ENODEV;
 996         switch (cmd) {
 997         case FBIOGET_VSCREENINFO:
 998                 return copy_to_user(argp, &info->var,
 999                                     sizeof(var)) ? -EFAULT : 0;
1000         case FBIOPUT_VSCREENINFO:
1001                 if (copy_from_user(&var, argp, sizeof(var)))
1002                         return -EFAULT;
1003                 acquire_console_sem();
1004                 info->flags |= FBINFO_MISC_USEREVENT;
1005                 i = fb_set_var(info, &var);
1006                 info->flags &= ~FBINFO_MISC_USEREVENT;
1007                 release_console_sem();
1008                 if (i) return i;
1009                 if (copy_to_user(argp, &var, sizeof(var)))
1010                         return -EFAULT;
1011                 return 0;
1012         case FBIOGET_FSCREENINFO:
1013                 return copy_to_user(argp, &info->fix,
1014                                     sizeof(fix)) ? -EFAULT : 0;
1015         case FBIOPUTCMAP:
1016                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1017                         return -EFAULT;
1018                 return (fb_set_user_cmap(&cmap, info));
1019         case FBIOGETCMAP:
1020                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1021                         return -EFAULT;
1022                 return fb_cmap_to_user(&info->cmap, &cmap);
1023         case FBIOPAN_DISPLAY:
1024                 if (copy_from_user(&var, argp, sizeof(var)))
1025                         return -EFAULT;
1026                 acquire_console_sem();
1027                 i = fb_pan_display(info, &var);
1028                 release_console_sem();
1029                 if (i)
1030                         return i;
1031                 if (copy_to_user(argp, &var, sizeof(var)))
1032                         return -EFAULT;
1033                 return 0;
1034         case FBIO_CURSOR:
1035                 return -EINVAL;
1036         case FBIOGET_CON2FBMAP:
1037                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1038                         return -EFAULT;
1039                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1040                     return -EINVAL;
1041                 con2fb.framebuffer = -1;
1042                 event.info = info;
1043                 event.data = &con2fb;
1044                 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
1045                 return copy_to_user(argp, &con2fb,
1046                                     sizeof(con2fb)) ? -EFAULT : 0;
1047         case FBIOPUT_CON2FBMAP:
1048                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1049                         return - EFAULT;
1050                 if (con2fb.console < 0 || con2fb.console > MAX_NR_CONSOLES)
1051                     return -EINVAL;
1052                 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
1053                     return -EINVAL;
1054 #ifdef CONFIG_KMOD
1055                 if (!registered_fb[con2fb.framebuffer])
1056                     try_to_load(con2fb.framebuffer);
1057 #endif /* CONFIG_KMOD */
1058                 if (!registered_fb[con2fb.framebuffer])
1059                     return -EINVAL;
1060                 event.info = info;
1061                 event.data = &con2fb;
1062                 return fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP,
1063                                               &event);
1064         case FBIOBLANK:
1065                 acquire_console_sem();
1066                 info->flags |= FBINFO_MISC_USEREVENT;
1067                 i = fb_blank(info, arg);
1068                 info->flags &= ~FBINFO_MISC_USEREVENT;
1069                 release_console_sem();
1070                 return i;
1071         default:
1072                 if (fb->fb_ioctl == NULL)
1073                         return -EINVAL;
1074                 return fb->fb_ioctl(info, cmd, arg);
1075         }
1076 }
1077
1078 #ifdef CONFIG_COMPAT
1079 struct fb_fix_screeninfo32 {
1080         char                    id[16];
1081         compat_caddr_t          smem_start;
1082         u32                     smem_len;
1083         u32                     type;
1084         u32                     type_aux;
1085         u32                     visual;
1086         u16                     xpanstep;
1087         u16                     ypanstep;
1088         u16                     ywrapstep;
1089         u32                     line_length;
1090         compat_caddr_t          mmio_start;
1091         u32                     mmio_len;
1092         u32                     accel;
1093         u16                     reserved[3];
1094 };
1095
1096 struct fb_cmap32 {
1097         u32                     start;
1098         u32                     len;
1099         compat_caddr_t  red;
1100         compat_caddr_t  green;
1101         compat_caddr_t  blue;
1102         compat_caddr_t  transp;
1103 };
1104
1105 static int fb_getput_cmap(struct inode *inode, struct file *file,
1106                         unsigned int cmd, unsigned long arg)
1107 {
1108         struct fb_cmap_user __user *cmap;
1109         struct fb_cmap32 __user *cmap32;
1110         __u32 data;
1111         int err;
1112
1113         cmap = compat_alloc_user_space(sizeof(*cmap));
1114         cmap32 = compat_ptr(arg);
1115
1116         if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1117                 return -EFAULT;
1118
1119         if (get_user(data, &cmap32->red) ||
1120             put_user(compat_ptr(data), &cmap->red) ||
1121             get_user(data, &cmap32->green) ||
1122             put_user(compat_ptr(data), &cmap->green) ||
1123             get_user(data, &cmap32->blue) ||
1124             put_user(compat_ptr(data), &cmap->blue) ||
1125             get_user(data, &cmap32->transp) ||
1126             put_user(compat_ptr(data), &cmap->transp))
1127                 return -EFAULT;
1128
1129         err = fb_ioctl(inode, file, cmd, (unsigned long) cmap);
1130
1131         if (!err) {
1132                 if (copy_in_user(&cmap32->start,
1133                                  &cmap->start,
1134                                  2 * sizeof(__u32)))
1135                         err = -EFAULT;
1136         }
1137         return err;
1138 }
1139
1140 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1141                                   struct fb_fix_screeninfo32 __user *fix32)
1142 {
1143         __u32 data;
1144         int err;
1145
1146         err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1147
1148         data = (__u32) (unsigned long) fix->smem_start;
1149         err |= put_user(data, &fix32->smem_start);
1150
1151         err |= put_user(fix->smem_len, &fix32->smem_len);
1152         err |= put_user(fix->type, &fix32->type);
1153         err |= put_user(fix->type_aux, &fix32->type_aux);
1154         err |= put_user(fix->visual, &fix32->visual);
1155         err |= put_user(fix->xpanstep, &fix32->xpanstep);
1156         err |= put_user(fix->ypanstep, &fix32->ypanstep);
1157         err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1158         err |= put_user(fix->line_length, &fix32->line_length);
1159
1160         data = (__u32) (unsigned long) fix->mmio_start;
1161         err |= put_user(data, &fix32->mmio_start);
1162
1163         err |= put_user(fix->mmio_len, &fix32->mmio_len);
1164         err |= put_user(fix->accel, &fix32->accel);
1165         err |= copy_to_user(fix32->reserved, fix->reserved,
1166                             sizeof(fix->reserved));
1167
1168         return err;
1169 }
1170
1171 static int fb_get_fscreeninfo(struct inode *inode, struct file *file,
1172                                 unsigned int cmd, unsigned long arg)
1173 {
1174         mm_segment_t old_fs;
1175         struct fb_fix_screeninfo fix;
1176         struct fb_fix_screeninfo32 __user *fix32;
1177         int err;
1178
1179         fix32 = compat_ptr(arg);
1180
1181         old_fs = get_fs();
1182         set_fs(KERNEL_DS);
1183         err = fb_ioctl(inode, file, cmd, (unsigned long) &fix);
1184         set_fs(old_fs);
1185
1186         if (!err)
1187                 err = do_fscreeninfo_to_user(&fix, fix32);
1188
1189         return err;
1190 }
1191
1192 static long
1193 fb_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1194 {
1195         struct inode *inode = file->f_path.dentry->d_inode;
1196         int fbidx = iminor(inode);
1197         struct fb_info *info = registered_fb[fbidx];
1198         struct fb_ops *fb = info->fbops;
1199         long ret = -ENOIOCTLCMD;
1200
1201         lock_kernel();
1202         switch(cmd) {
1203         case FBIOGET_VSCREENINFO:
1204         case FBIOPUT_VSCREENINFO:
1205         case FBIOPAN_DISPLAY:
1206         case FBIOGET_CON2FBMAP:
1207         case FBIOPUT_CON2FBMAP:
1208                 arg = (unsigned long) compat_ptr(arg);
1209         case FBIOBLANK:
1210                 ret = fb_ioctl(inode, file, cmd, arg);
1211                 break;
1212
1213         case FBIOGET_FSCREENINFO:
1214                 ret = fb_get_fscreeninfo(inode, file, cmd, arg);
1215                 break;
1216
1217         case FBIOGETCMAP:
1218         case FBIOPUTCMAP:
1219                 ret = fb_getput_cmap(inode, file, cmd, arg);
1220                 break;
1221
1222         default:
1223                 if (fb->fb_compat_ioctl)
1224                         ret = fb->fb_compat_ioctl(info, cmd, arg);
1225                 break;
1226         }
1227         unlock_kernel();
1228         return ret;
1229 }
1230 #endif
1231
1232 static int
1233 fb_mmap(struct file *file, struct vm_area_struct * vma)
1234 {
1235         int fbidx = iminor(file->f_path.dentry->d_inode);
1236         struct fb_info *info = registered_fb[fbidx];
1237         struct fb_ops *fb = info->fbops;
1238         unsigned long off;
1239         unsigned long start;
1240         u32 len;
1241
1242         if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
1243                 return -EINVAL;
1244         off = vma->vm_pgoff << PAGE_SHIFT;
1245         if (!fb)
1246                 return -ENODEV;
1247         if (fb->fb_mmap) {
1248                 int res;
1249                 lock_kernel();
1250                 res = fb->fb_mmap(info, vma);
1251                 unlock_kernel();
1252                 return res;
1253         }
1254
1255         lock_kernel();
1256
1257         /* frame buffer memory */
1258         start = info->fix.smem_start;
1259         len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
1260         if (off >= len) {
1261                 /* memory mapped io */
1262                 off -= len;
1263                 if (info->var.accel_flags) {
1264                         unlock_kernel();
1265                         return -EINVAL;
1266                 }
1267                 start = info->fix.mmio_start;
1268                 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
1269         }
1270         unlock_kernel();
1271         start &= PAGE_MASK;
1272         if ((vma->vm_end - vma->vm_start + off) > len)
1273                 return -EINVAL;
1274         off += start;
1275         vma->vm_pgoff = off >> PAGE_SHIFT;
1276         /* This is an IO map - tell maydump to skip this VMA */
1277         vma->vm_flags |= VM_IO | VM_RESERVED;
1278         fb_pgprotect(file, vma, off);
1279         if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1280                              vma->vm_end - vma->vm_start, vma->vm_page_prot))
1281                 return -EAGAIN;
1282         return 0;
1283 }
1284
1285 static int
1286 fb_open(struct inode *inode, struct file *file)
1287 {
1288         int fbidx = iminor(inode);
1289         struct fb_info *info;
1290         int res = 0;
1291
1292         if (fbidx >= FB_MAX)
1293                 return -ENODEV;
1294 #ifdef CONFIG_KMOD
1295         if (!(info = registered_fb[fbidx]))
1296                 try_to_load(fbidx);
1297 #endif /* CONFIG_KMOD */
1298         if (!(info = registered_fb[fbidx]))
1299                 return -ENODEV;
1300         if (!try_module_get(info->fbops->owner))
1301                 return -ENODEV;
1302         file->private_data = info;
1303         if (info->fbops->fb_open) {
1304                 res = info->fbops->fb_open(info,1);
1305                 if (res)
1306                         module_put(info->fbops->owner);
1307         }
1308         return res;
1309 }
1310
1311 static int
1312 fb_release(struct inode *inode, struct file *file)
1313 {
1314         struct fb_info * const info = file->private_data;
1315
1316         lock_kernel();
1317         if (info->fbops->fb_release)
1318                 info->fbops->fb_release(info,1);
1319         module_put(info->fbops->owner);
1320         unlock_kernel();
1321         return 0;
1322 }
1323
1324 static const struct file_operations fb_fops = {
1325         .owner =        THIS_MODULE,
1326         .read =         fb_read,
1327         .write =        fb_write,
1328         .ioctl =        fb_ioctl,
1329 #ifdef CONFIG_COMPAT
1330         .compat_ioctl = fb_compat_ioctl,
1331 #endif
1332         .mmap =         fb_mmap,
1333         .open =         fb_open,
1334         .release =      fb_release,
1335 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1336         .get_unmapped_area = get_fb_unmapped_area,
1337 #endif
1338 #ifdef CONFIG_FB_DEFERRED_IO
1339         .fsync =        fb_deferred_io_fsync,
1340 #endif
1341 };
1342
1343 struct class *fb_class;
1344 EXPORT_SYMBOL(fb_class);
1345 /**
1346  *      register_framebuffer - registers a frame buffer device
1347  *      @fb_info: frame buffer info structure
1348  *
1349  *      Registers a frame buffer device @fb_info.
1350  *
1351  *      Returns negative errno on error, or zero for success.
1352  *
1353  */
1354
1355 int
1356 register_framebuffer(struct fb_info *fb_info)
1357 {
1358         int i;
1359         struct fb_event event;
1360         struct fb_videomode mode;
1361
1362         if (num_registered_fb == FB_MAX)
1363                 return -ENXIO;
1364         num_registered_fb++;
1365         for (i = 0 ; i < FB_MAX; i++)
1366                 if (!registered_fb[i])
1367                         break;
1368         fb_info->node = i;
1369
1370         fb_info->dev = device_create(fb_class, fb_info->device,
1371                                      MKDEV(FB_MAJOR, i), "fb%d", i);
1372         if (IS_ERR(fb_info->dev)) {
1373                 /* Not fatal */
1374                 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1375                 fb_info->dev = NULL;
1376         } else
1377                 fb_init_device(fb_info);
1378
1379         if (fb_info->pixmap.addr == NULL) {
1380                 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1381                 if (fb_info->pixmap.addr) {
1382                         fb_info->pixmap.size = FBPIXMAPSIZE;
1383                         fb_info->pixmap.buf_align = 1;
1384                         fb_info->pixmap.scan_align = 1;
1385                         fb_info->pixmap.access_align = 32;
1386                         fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1387                 }
1388         }
1389         fb_info->pixmap.offset = 0;
1390
1391         if (!fb_info->pixmap.blit_x)
1392                 fb_info->pixmap.blit_x = ~(u32)0;
1393
1394         if (!fb_info->pixmap.blit_y)
1395                 fb_info->pixmap.blit_y = ~(u32)0;
1396
1397         if (!fb_info->modelist.prev || !fb_info->modelist.next)
1398                 INIT_LIST_HEAD(&fb_info->modelist);
1399
1400         fb_var_to_videomode(&mode, &fb_info->var);
1401         fb_add_videomode(&mode, &fb_info->modelist);
1402         registered_fb[i] = fb_info;
1403
1404         event.info = fb_info;
1405         fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1406         return 0;
1407 }
1408
1409
1410 /**
1411  *      unregister_framebuffer - releases a frame buffer device
1412  *      @fb_info: frame buffer info structure
1413  *
1414  *      Unregisters a frame buffer device @fb_info.
1415  *
1416  *      Returns negative errno on error, or zero for success.
1417  *
1418  *      This function will also notify the framebuffer console
1419  *      to release the driver.
1420  *
1421  *      This is meant to be called within a driver's module_exit()
1422  *      function. If this is called outside module_exit(), ensure
1423  *      that the driver implements fb_open() and fb_release() to
1424  *      check that no processes are using the device.
1425  */
1426
1427 int
1428 unregister_framebuffer(struct fb_info *fb_info)
1429 {
1430         struct fb_event event;
1431         int i, ret = 0;
1432
1433         i = fb_info->node;
1434         if (!registered_fb[i]) {
1435                 ret = -EINVAL;
1436                 goto done;
1437         }
1438
1439         event.info = fb_info;
1440         ret = fb_notifier_call_chain(FB_EVENT_FB_UNBIND, &event);
1441
1442         if (ret) {
1443                 ret = -EINVAL;
1444                 goto done;
1445         }
1446
1447         if (fb_info->pixmap.addr &&
1448             (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1449                 kfree(fb_info->pixmap.addr);
1450         fb_destroy_modelist(&fb_info->modelist);
1451         registered_fb[i]=NULL;
1452         num_registered_fb--;
1453         fb_cleanup_device(fb_info);
1454         device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1455         event.info = fb_info;
1456         fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1457 done:
1458         return ret;
1459 }
1460
1461 /**
1462  *      fb_set_suspend - low level driver signals suspend
1463  *      @info: framebuffer affected
1464  *      @state: 0 = resuming, !=0 = suspending
1465  *
1466  *      This is meant to be used by low level drivers to
1467  *      signal suspend/resume to the core & clients.
1468  *      It must be called with the console semaphore held
1469  */
1470 void fb_set_suspend(struct fb_info *info, int state)
1471 {
1472         struct fb_event event;
1473
1474         event.info = info;
1475         if (state) {
1476                 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event);
1477                 info->state = FBINFO_STATE_SUSPENDED;
1478         } else {
1479                 info->state = FBINFO_STATE_RUNNING;
1480                 fb_notifier_call_chain(FB_EVENT_RESUME, &event);
1481         }
1482 }
1483
1484 /**
1485  *      fbmem_init - init frame buffer subsystem
1486  *
1487  *      Initialize the frame buffer subsystem.
1488  *
1489  *      NOTE: This function is _only_ to be called by drivers/char/mem.c.
1490  *
1491  */
1492
1493 static int __init
1494 fbmem_init(void)
1495 {
1496         create_proc_read_entry("fb", 0, NULL, fbmem_read_proc, NULL);
1497
1498         if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1499                 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1500
1501         fb_class = class_create(THIS_MODULE, "graphics");
1502         if (IS_ERR(fb_class)) {
1503                 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1504                 fb_class = NULL;
1505         }
1506         return 0;
1507 }
1508
1509 #ifdef MODULE
1510 module_init(fbmem_init);
1511 static void __exit
1512 fbmem_exit(void)
1513 {
1514         class_destroy(fb_class);
1515         unregister_chrdev(FB_MAJOR, "fb");
1516 }
1517
1518 module_exit(fbmem_exit);
1519 MODULE_LICENSE("GPL");
1520 MODULE_DESCRIPTION("Framebuffer base");
1521 #else
1522 subsys_initcall(fbmem_init);
1523 #endif
1524
1525 int fb_new_modelist(struct fb_info *info)
1526 {
1527         struct fb_event event;
1528         struct fb_var_screeninfo var = info->var;
1529         struct list_head *pos, *n;
1530         struct fb_modelist *modelist;
1531         struct fb_videomode *m, mode;
1532         int err = 1;
1533
1534         list_for_each_safe(pos, n, &info->modelist) {
1535                 modelist = list_entry(pos, struct fb_modelist, list);
1536                 m = &modelist->mode;
1537                 fb_videomode_to_var(&var, m);
1538                 var.activate = FB_ACTIVATE_TEST;
1539                 err = fb_set_var(info, &var);
1540                 fb_var_to_videomode(&mode, &var);
1541                 if (err || !fb_mode_is_equal(m, &mode)) {
1542                         list_del(pos);
1543                         kfree(pos);
1544                 }
1545         }
1546
1547         err = 1;
1548
1549         if (!list_empty(&info->modelist)) {
1550                 event.info = info;
1551                 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
1552         }
1553
1554         return err;
1555 }
1556
1557 static char *video_options[FB_MAX] __read_mostly;
1558 static int ofonly __read_mostly;
1559
1560 extern const char *global_mode_option;
1561
1562 /**
1563  * fb_get_options - get kernel boot parameters
1564  * @name:   framebuffer name as it would appear in
1565  *          the boot parameter line
1566  *          (video=<name>:<options>)
1567  * @option: the option will be stored here
1568  *
1569  * NOTE: Needed to maintain backwards compatibility
1570  */
1571 int fb_get_options(char *name, char **option)
1572 {
1573         char *opt, *options = NULL;
1574         int opt_len, retval = 0;
1575         int name_len = strlen(name), i;
1576
1577         if (name_len && ofonly && strncmp(name, "offb", 4))
1578                 retval = 1;
1579
1580         if (name_len && !retval) {
1581                 for (i = 0; i < FB_MAX; i++) {
1582                         if (video_options[i] == NULL)
1583                                 continue;
1584                         opt_len = strlen(video_options[i]);
1585                         if (!opt_len)
1586                                 continue;
1587                         opt = video_options[i];
1588                         if (!strncmp(name, opt, name_len) &&
1589                             opt[name_len] == ':')
1590                                 options = opt + name_len + 1;
1591                 }
1592         }
1593         if (options && !strncmp(options, "off", 3))
1594                 retval = 1;
1595
1596         if (option)
1597                 *option = options;
1598
1599         return retval;
1600 }
1601
1602 #ifndef MODULE
1603 /**
1604  *      video_setup - process command line options
1605  *      @options: string of options
1606  *
1607  *      Process command line options for frame buffer subsystem.
1608  *
1609  *      NOTE: This function is a __setup and __init function.
1610  *            It only stores the options.  Drivers have to call
1611  *            fb_get_options() as necessary.
1612  *
1613  *      Returns zero.
1614  *
1615  */
1616 static int __init video_setup(char *options)
1617 {
1618         int i, global = 0;
1619
1620         if (!options || !*options)
1621                 global = 1;
1622
1623         if (!global && !strncmp(options, "ofonly", 6)) {
1624                 ofonly = 1;
1625                 global = 1;
1626         }
1627
1628         if (!global && !strstr(options, "fb:")) {
1629                 global_mode_option = options;
1630                 global = 1;
1631         }
1632
1633         if (!global) {
1634                 for (i = 0; i < FB_MAX; i++) {
1635                         if (video_options[i] == NULL) {
1636                                 video_options[i] = options;
1637                                 break;
1638                         }
1639
1640                 }
1641         }
1642
1643         return 1;
1644 }
1645 __setup("video=", video_setup);
1646 #endif
1647
1648     /*
1649      *  Visible symbols for modules
1650      */
1651
1652 EXPORT_SYMBOL(register_framebuffer);
1653 EXPORT_SYMBOL(unregister_framebuffer);
1654 EXPORT_SYMBOL(num_registered_fb);
1655 EXPORT_SYMBOL(registered_fb);
1656 EXPORT_SYMBOL(fb_prepare_logo);
1657 EXPORT_SYMBOL(fb_show_logo);
1658 EXPORT_SYMBOL(fb_set_var);
1659 EXPORT_SYMBOL(fb_blank);
1660 EXPORT_SYMBOL(fb_pan_display);
1661 EXPORT_SYMBOL(fb_get_buffer_offset);
1662 EXPORT_SYMBOL(fb_set_suspend);
1663 EXPORT_SYMBOL(fb_get_options);
1664
1665 MODULE_LICENSE("GPL");