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   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         switch (fb_get_color_depth(&info->var, &info->fix)) {
 248         case 1:
 249                 fg = 1;
 250                 break;
 251         case 2:
 252                 fg = 3;
 253                 break;
 254         default:
 255                 fg = 7;
 256                 break;
 257         }
 258
 259         if (info->fix.visual == FB_VISUAL_MONO01 ||
 260             info->fix.visual == FB_VISUAL_MONO10)
 261                 fg = ~((u8) (0xfff << info->var.green.length));
 262
 263         switch (depth) {
 264         case 4:
 265                 for (i = 0; i < logo->height; i++)
 266                         for (j = 0; j < logo->width; src++) {
 267                                 *dst++ = *src >> 4;
 268                                 j++;
 269                                 if (j < logo->width) {
 270                                         *dst++ = *src & 0x0f;
 271                                         j++;
 272                                 }
 273                         }
 274                 break;
 275         case 1:
 276                 for (i = 0; i < logo->height; i++) {
 277                         for (j = 0; j < logo->width; src++) {
 278                                 d = *src ^ xor;
 279                                 for (k = 7; k >= 0; k--) {
 280                                         *dst++ = ((d >> k) & 1) ? fg : 0;
 281                                         j++;
 282                                 }
 283                         }
 284                 }
 285                 break;
 286         }
 287 }
 288
 289 /*
 290  * Three (3) kinds of logo maps exist.  linux_logo_clut224 (>16 colors),
 291  * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors).  Depending on
 292  * the visual format and color depth of the framebuffer, the DAC, the
 293  * pseudo_palette, and the logo data will be adjusted accordingly.
 294  *
 295  * Case 1 - linux_logo_clut224:
 296  * Color exceeds the number of console colors (16), thus we set the hardware DAC
 297  * using fb_set_cmap() appropriately.  The "needs_cmapreset"  flag will be set.
 298  *
 299  * For visuals that require color info from the pseudo_palette, we also construct
 300  * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
 301  * will be set.
 302  *
 303  * Case 2 - linux_logo_vga16:
 304  * The number of colors just matches the console colors, thus there is no need
 305  * to set the DAC or the pseudo_palette.  However, the bitmap is packed, ie,
 306  * each byte contains color information for two pixels (upper and lower nibble).
 307  * To be consistent with fb_imageblit() usage, we therefore separate the two
 308  * nibbles into separate bytes. The "depth" flag will be set to 4.
 309  *
 310  * Case 3 - linux_logo_mono:
 311  * This is similar with Case 2.  Each byte contains information for 8 pixels.
 312  * We isolate each bit and expand each into a byte. The "depth" flag will
 313  * be set to 1.
 314  */
 315 static struct logo_data {
 316         int depth;
 317         int needs_directpalette;
 318         int needs_truepalette;
 319         int needs_cmapreset;
 320         const struct linux_logo *logo;
 321 } fb_logo __read_mostly;
 322
 323 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
 324 {
 325         u32 size = width * height, i;
 326
 327         out += size - 1;
 328
 329         for (i = size; i--; )
 330                 *out-- = *in++;
 331 }
 332
 333 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
 334 {
 335         int i, j, h = height - 1;
 336
 337         for (i = 0; i < height; i++)
 338                 for (j = 0; j < width; j++)
 339                                 out[height * j + h - i] = *in++;
 340 }
 341
 342 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
 343 {
 344         int i, j, w = width - 1;
 345
 346         for (i = 0; i < height; i++)
 347                 for (j = 0; j < width; j++)
 348                         out[height * (w - j) + i] = *in++;
 349 }
 350
 351 static void fb_rotate_logo(struct fb_info *info, u8 *dst,
 352                            struct fb_image *image, int rotate)
 353 {
 354         u32 tmp;
 355
 356         if (rotate == FB_ROTATE_UD) {
 357                 fb_rotate_logo_ud(image->data, dst, image->width,
 358                                   image->height);
 359                 image->dx = info->var.xres - image->width - image->dx;
 360                 image->dy = info->var.yres - image->height - image->dy;
 361         } else if (rotate == FB_ROTATE_CW) {
 362                 fb_rotate_logo_cw(image->data, dst, image->width,
 363                                   image->height);
 364                 tmp = image->width;
 365                 image->width = image->height;
 366                 image->height = tmp;
 367                 tmp = image->dy;
 368                 image->dy = image->dx;
 369                 image->dx = info->var.xres - image->width - tmp;
 370         } else if (rotate == FB_ROTATE_CCW) {
 371                 fb_rotate_logo_ccw(image->data, dst, image->width,
 372                                    image->height);
 373                 tmp = image->width;
 374                 image->width = image->height;
 375                 image->height = tmp;
 376                 tmp = image->dx;
 377                 image->dx = image->dy;
 378                 image->dy = info->var.yres - image->height - tmp;
 379         }
 380
 381         image->data = dst;
 382 }
 383
 384 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
 385                             int rotate, unsigned int num)
 386 {
 387         unsigned int x;
 388
 389         if (rotate == FB_ROTATE_UR) {
 390                 for (x = 0;
 391                      x < num && image->dx + image->width <= info->var.xres;
 392                      x++) {
 393                         info->fbops->fb_imageblit(info, image);
 394                         image->dx += image->width + 8;
 395                 }
 396         } else if (rotate == FB_ROTATE_UD) {
 397                 for (x = 0; x < num && image->dx >= 0; x++) {
 398                         info->fbops->fb_imageblit(info, image);
 399                         image->dx -= image->width + 8;
 400                 }
 401         } else if (rotate == FB_ROTATE_CW) {
 402                 for (x = 0;
 403                      x < num && image->dy + image->height <= info->var.yres;
 404                      x++) {
 405                         info->fbops->fb_imageblit(info, image);
 406                         image->dy += image->height + 8;
 407                 }
 408         } else if (rotate == FB_ROTATE_CCW) {
 409                 for (x = 0; x < num && image->dy >= 0; x++) {
 410                         info->fbops->fb_imageblit(info, image);
 411                         image->dy -= image->height + 8;
 412                 }
 413         }
 414 }
 415
 416 static int fb_show_logo_line(struct fb_info *info, int rotate,
 417                              const struct linux_logo *logo, int y,
 418                              unsigned int n)
 419 {
 420         u32 *palette = NULL, *saved_pseudo_palette = NULL;
 421         unsigned char *logo_new = NULL, *logo_rotate = NULL;
 422         struct fb_image image;
 423
 424         /* Return if the frame buffer is not mapped or suspended */
 425         if (logo == NULL || info->state != FBINFO_STATE_RUNNING ||
 426             info->flags & FBINFO_MODULE)
 427                 return 0;
 428
 429         image.depth = 8;
 430         image.data = logo->data;
 431
 432         if (fb_logo.needs_cmapreset)
 433                 fb_set_logocmap(info, logo);
 434
 435         if (fb_logo.needs_truepalette ||
 436             fb_logo.needs_directpalette) {
 437                 palette = kmalloc(256 * 4, GFP_KERNEL);
 438                 if (palette == NULL)
 439                         return 0;
 440
 441                 if (fb_logo.needs_truepalette)
 442                         fb_set_logo_truepalette(info, logo, palette);
 443                 else
 444                         fb_set_logo_directpalette(info, logo, palette);
 445
 446                 saved_pseudo_palette = info->pseudo_palette;
 447                 info->pseudo_palette = palette;
 448         }
 449
 450         if (fb_logo.depth <= 4) {
 451                 logo_new = kmalloc(logo->width * logo->height, GFP_KERNEL);
 452                 if (logo_new == NULL) {
 453                         kfree(palette);
 454                         if (saved_pseudo_palette)
 455                                 info->pseudo_palette = saved_pseudo_palette;
 456                         return 0;
 457                 }
 458                 image.data = logo_new;
 459                 fb_set_logo(info, logo, logo_new, fb_logo.depth);
 460         }
 461
 462         image.dx = 0;
 463         image.dy = y;
 464         image.width = logo->width;
 465         image.height = logo->height;
 466
 467         if (rotate) {
 468                 logo_rotate = kmalloc(logo->width *
 469                                       logo->height, GFP_KERNEL);
 470                 if (logo_rotate)
 471                         fb_rotate_logo(info, logo_rotate, &image, rotate);
 472         }
 473
 474         fb_do_show_logo(info, &image, rotate, n);
 475
 476         kfree(palette);
 477         if (saved_pseudo_palette != NULL)
 478                 info->pseudo_palette = saved_pseudo_palette;
 479         kfree(logo_new);
 480         kfree(logo_rotate);
 481         return logo->height;
 482 }
 483
 484
 485 #ifdef CONFIG_FB_LOGO_EXTRA
 486
 487 #define FB_LOGO_EX_NUM_MAX 10
 488 static struct logo_data_extra {
 489         const struct linux_logo *logo;
 490         unsigned int n;
 491 } fb_logo_ex[FB_LOGO_EX_NUM_MAX];
 492 static unsigned int fb_logo_ex_num;
 493
 494 void fb_append_extra_logo(const struct linux_logo *logo, unsigned int n)
 495 {
 496         if (!n || fb_logo_ex_num == FB_LOGO_EX_NUM_MAX)
 497                 return;
 498
 499         fb_logo_ex[fb_logo_ex_num].logo = logo;
 500         fb_logo_ex[fb_logo_ex_num].n = n;
 501         fb_logo_ex_num++;
 502 }
 503
 504 static int fb_prepare_extra_logos(struct fb_info *info, unsigned int height,
 505                                   unsigned int yres)
 506 {
 507         unsigned int i;
 508
 509         /* FIXME: logo_ex supports only truecolor fb. */
 510         if (info->fix.visual != FB_VISUAL_TRUECOLOR)
 511                 fb_logo_ex_num = 0;
 512
 513         for (i = 0; i < fb_logo_ex_num; i++) {
 514                 height += fb_logo_ex[i].logo->height;
 515                 if (height > yres) {
 516                         height -= fb_logo_ex[i].logo->height;
 517                         fb_logo_ex_num = i;
 518                         break;
 519                 }
 520         }
 521         return height;
 522 }
 523
 524 static int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
 525 {
 526         unsigned int i;
 527
 528         for (i = 0; i < fb_logo_ex_num; i++)
 529                 y += fb_show_logo_line(info, rotate,
 530                                        fb_logo_ex[i].logo, y, fb_logo_ex[i].n);
 531
 532         return y;
 533 }
 534
 535 #else /* !CONFIG_FB_LOGO_EXTRA */
 536
 537 static inline int fb_prepare_extra_logos(struct fb_info *info,
 538                                          unsigned int height,
 539                                          unsigned int yres)
 540 {
 541         return height;
 542 }
 543
 544 static inline int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
 545 {
 546         return y;
 547 }
 548
 549 #endif /* CONFIG_FB_LOGO_EXTRA */
 550
 551
 552 int fb_prepare_logo(struct fb_info *info, int rotate)
 553 {
 554         int depth = fb_get_color_depth(&info->var, &info->fix);
 555         unsigned int yres;
 556
 557         memset(&fb_logo, 0, sizeof(struct logo_data));
 558
 559         if (info->flags & FBINFO_MISC_TILEBLITTING ||
 560             info->flags & FBINFO_MODULE)
 561                 return 0;
 562
 563         if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
 564                 depth = info->var.blue.length;
 565                 if (info->var.red.length < depth)
 566                         depth = info->var.red.length;
 567                 if (info->var.green.length < depth)
 568                         depth = info->var.green.length;
 569         }
 570
 571         if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) {
 572                 /* assume console colormap */
 573                 depth = 4;
 574         }
 575
 576         /* Return if no suitable logo was found */
 577         fb_logo.logo = fb_find_logo(depth);
 578
 579         if (!fb_logo.logo) {
 580                 return 0;
 581         }
 582
 583         if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
 584                 yres = info->var.yres;
 585         else
 586                 yres = info->var.xres;
 587
 588         if (fb_logo.logo->height > yres) {
 589                 fb_logo.logo = NULL;
 590                 return 0;
 591         }
 592
 593         /* What depth we asked for might be different from what we get */
 594         if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
 595                 fb_logo.depth = 8;
 596         else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
 597                 fb_logo.depth = 4;
 598         else
 599                 fb_logo.depth = 1;
 600
 601
 602         if (fb_logo.depth > 4 && depth > 4) {
 603                 switch (info->fix.visual) {
 604                 case FB_VISUAL_TRUECOLOR:
 605                         fb_logo.needs_truepalette = 1;
 606                         break;
 607                 case FB_VISUAL_DIRECTCOLOR:
 608                         fb_logo.needs_directpalette = 1;
 609                         fb_logo.needs_cmapreset = 1;
 610                         break;
 611                 case FB_VISUAL_PSEUDOCOLOR:
 612                         fb_logo.needs_cmapreset = 1;
 613                         break;
 614                 }
 615         }
 616
 617         return fb_prepare_extra_logos(info, fb_logo.logo->height, yres);
 618 }
 619
 620 int fb_show_logo(struct fb_info *info, int rotate)
 621 {
 622         int y;
 623
 624         y = fb_show_logo_line(info, rotate, fb_logo.logo, 0,
 625                               num_online_cpus());
 626         y = fb_show_extra_logos(info, y, rotate);
 627
 628         return y;
 629 }
 630 #else
 631 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
 632 int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
 633 #endif /* CONFIG_LOGO */
 634
 635 static int fbmem_read_proc(char *buf, char **start, off_t offset,
 636                            int len, int *eof, void *private)
 637 {
 638         struct fb_info **fi;
 639         int clen;
 640
 641         clen = 0;
 642         for (fi = registered_fb; fi < &registered_fb[FB_MAX] && clen < 4000;
 643              fi++)
 644                 if (*fi)
 645                         clen += sprintf(buf + clen, "%d %s\n",
 646                                         (*fi)->node,
 647                                         (*fi)->fix.id);
 648         *start = buf + offset;
 649         if (clen > offset)
 650                 clen -= offset;
 651         else
 652                 clen = 0;
 653         return clen < len ? clen : len;
 654 }
 655
 656 static ssize_t
 657 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 658 {
 659         unsigned long p = *ppos;
 660         struct inode *inode = file->f_path.dentry->d_inode;
 661         int fbidx = iminor(inode);
 662         struct fb_info *info = registered_fb[fbidx];
 663         u32 *buffer, *dst;
 664         u32 __iomem *src;
 665         int c, i, cnt = 0, err = 0;
 666         unsigned long total_size;
 667
 668         if (!info || ! info->screen_base)
 669                 return -ENODEV;
 670
 671         if (info->state != FBINFO_STATE_RUNNING)
 672                 return -EPERM;
 673
 674         if (info->fbops->fb_read)
 675                 return info->fbops->fb_read(info, buf, count, ppos);
 676
 677         total_size = info->screen_size;
 678
 679         if (total_size == 0)
 680                 total_size = info->fix.smem_len;
 681
 682         if (p >= total_size)
 683                 return 0;
 684
 685         if (count >= total_size)
 686                 count = total_size;
 687
 688         if (count + p > total_size)
 689                 count = total_size - p;
 690
 691         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 692                          GFP_KERNEL);
 693         if (!buffer)
 694                 return -ENOMEM;
 695
 696         src = (u32 __iomem *) (info->screen_base + p);
 697
 698         if (info->fbops->fb_sync)
 699                 info->fbops->fb_sync(info);
 700
 701         while (count) {
 702                 c  = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 703                 dst = buffer;
 704                 for (i = c >> 2; i--; )
 705                         *dst++ = fb_readl(src++);
 706                 if (c & 3) {
 707                         u8 *dst8 = (u8 *) dst;
 708                         u8 __iomem *src8 = (u8 __iomem *) src;
 709
 710                         for (i = c & 3; i--;)
 711                                 *dst8++ = fb_readb(src8++);
 712
 713                         src = (u32 __iomem *) src8;
 714                 }
 715
 716                 if (copy_to_user(buf, buffer, c)) {
 717                         err = -EFAULT;
 718                         break;
 719                 }
 720                 *ppos += c;
 721                 buf += c;
 722                 cnt += c;
 723                 count -= c;
 724         }
 725
 726         kfree(buffer);
 727
 728         return (err) ? err : cnt;
 729 }
 730
 731 static ssize_t
 732 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 733 {
 734         unsigned long p = *ppos;
 735         struct inode *inode = file->f_path.dentry->d_inode;
 736         int fbidx = iminor(inode);
 737         struct fb_info *info = registered_fb[fbidx];
 738         u32 *buffer, *src;
 739         u32 __iomem *dst;
 740         int c, i, cnt = 0, err = 0;
 741         unsigned long total_size;
 742
 743         if (!info || !info->screen_base)
 744                 return -ENODEV;
 745
 746         if (info->state != FBINFO_STATE_RUNNING)
 747                 return -EPERM;
 748
 749         if (info->fbops->fb_write)
 750                 return info->fbops->fb_write(info, buf, count, ppos);
 751
 752         total_size = info->screen_size;
 753
 754         if (total_size == 0)
 755                 total_size = info->fix.smem_len;
 756
 757         if (p > total_size)
 758                 return -EFBIG;
 759
 760         if (count > total_size) {
 761                 err = -EFBIG;
 762                 count = total_size;
 763         }
 764
 765         if (count + p > total_size) {
 766                 if (!err)
 767                         err = -ENOSPC;
 768
 769                 count = total_size - p;
 770         }
 771
 772         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 773                          GFP_KERNEL);
 774         if (!buffer)
 775                 return -ENOMEM;
 776
 777         dst = (u32 __iomem *) (info->screen_base + p);
 778
 779         if (info->fbops->fb_sync)
 780                 info->fbops->fb_sync(info);
 781
 782         while (count) {
 783                 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 784                 src = buffer;
 785
 786                 if (copy_from_user(src, buf, c)) {
 787                         err = -EFAULT;
 788                         break;
 789                 }
 790
 791                 for (i = c >> 2; i--; )
 792                         fb_writel(*src++, dst++);
 793
 794                 if (c & 3) {
 795                         u8 *src8 = (u8 *) src;
 796                         u8 __iomem *dst8 = (u8 __iomem *) dst;
 797
 798                         for (i = c & 3; i--; )
 799                                 fb_writeb(*src8++, dst8++);
 800
 801                         dst = (u32 __iomem *) dst8;
 802                 }
 803
 804                 *ppos += c;
 805                 buf += c;
 806                 cnt += c;
 807                 count -= c;
 808         }
 809
 810         kfree(buffer);
 811
 812         return (cnt) ? cnt : err;
 813 }
 814
 815 #ifdef CONFIG_KMOD
 816 static void try_to_load(int fb)
 817 {
 818         request_module("fb%d", fb);
 819 }
 820 #endif /* CONFIG_KMOD */
 821
 822 int
 823 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
 824 {
 825         struct fb_fix_screeninfo *fix = &info->fix;
 826         int xoffset = var->xoffset;
 827         int yoffset = var->yoffset;
 828         int err = 0, yres = info->var.yres;
 829
 830         if (var->yoffset > 0) {
 831                 if (var->vmode & FB_VMODE_YWRAP) {
 832                         if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
 833                                 err = -EINVAL;
 834                         else
 835                                 yres = 0;
 836                 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
 837                         err = -EINVAL;
 838         }
 839
 840         if (var->xoffset > 0 && (!fix->xpanstep ||
 841                                  (var->xoffset % fix->xpanstep)))
 842                 err = -EINVAL;
 843
 844         if (err || !info->fbops->fb_pan_display || xoffset < 0 ||
 845             yoffset < 0 || var->yoffset + yres > info->var.yres_virtual ||
 846             var->xoffset + info->var.xres > info->var.xres_virtual)
 847                 return -EINVAL;
 848
 849         if ((err = info->fbops->fb_pan_display(var, info)))
 850                 return err;
 851         info->var.xoffset = var->xoffset;
 852         info->var.yoffset = var->yoffset;
 853         if (var->vmode & FB_VMODE_YWRAP)
 854                 info->var.vmode |= FB_VMODE_YWRAP;
 855         else
 856                 info->var.vmode &= ~FB_VMODE_YWRAP;
 857         return 0;
 858 }
 859
 860 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var,
 861                          u32 activate)
 862 {
 863         struct fb_event event;
 864         struct fb_blit_caps caps, fbcaps;
 865         int err = 0;
 866
 867         memset(&caps, 0, sizeof(caps));
 868         memset(&fbcaps, 0, sizeof(fbcaps));
 869         caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0;
 870         event.info = info;
 871         event.data = &caps;
 872         fb_notifier_call_chain(FB_EVENT_GET_REQ, &event);
 873         info->fbops->fb_get_caps(info, &fbcaps, var);
 874
 875         if (((fbcaps.x ^ caps.x) & caps.x) ||
 876             ((fbcaps.y ^ caps.y) & caps.y) ||
 877             (fbcaps.len < caps.len))
 878                 err = -EINVAL;
 879
 880         return err;
 881 }
 882
 883 int
 884 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
 885 {
 886         int flags = info->flags;
 887         int ret = 0;
 888
 889         if (var->activate & FB_ACTIVATE_INV_MODE) {
 890                 struct fb_videomode mode1, mode2;
 891
 892                 fb_var_to_videomode(&mode1, var);
 893                 fb_var_to_videomode(&mode2, &info->var);
 894                 /* make sure we don't delete the videomode of current var */
 895                 ret = fb_mode_is_equal(&mode1, &mode2);
 896
 897                 if (!ret) {
 898                     struct fb_event event;
 899
 900                     event.info = info;
 901                     event.data = &mode1;
 902                     ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event);
 903                 }
 904
 905                 if (!ret)
 906                     fb_delete_videomode(&mode1, &info->modelist);
 907
 908
 909                 ret = (ret) ? -EINVAL : 0;
 910                 goto done;
 911         }
 912
 913         if ((var->activate & FB_ACTIVATE_FORCE) ||
 914             memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
 915                 u32 activate = var->activate;
 916
 917                 if (!info->fbops->fb_check_var) {
 918                         *var = info->var;
 919                         goto done;
 920                 }
 921
 922                 ret = info->fbops->fb_check_var(var, info);
 923
 924                 if (ret)
 925                         goto done;
 926
 927                 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
 928                         struct fb_videomode mode;
 929
 930                         if (info->fbops->fb_get_caps) {
 931                                 ret = fb_check_caps(info, var, activate);
 932
 933                                 if (ret)
 934                                         goto done;
 935                         }
 936
 937                         info->var = *var;
 938
 939                         if (info->fbops->fb_set_par)
 940                                 info->fbops->fb_set_par(info);
 941
 942                         fb_pan_display(info, &info->var);
 943                         fb_set_cmap(&info->cmap, info);
 944                         fb_var_to_videomode(&mode, &info->var);
 945
 946                         if (info->modelist.prev && info->modelist.next &&
 947                             !list_empty(&info->modelist))
 948                                 ret = fb_add_videomode(&mode, &info->modelist);
 949
 950                         if (!ret && (flags & FBINFO_MISC_USEREVENT)) {
 951                                 struct fb_event event;
 952                                 int evnt = (activate & FB_ACTIVATE_ALL) ?
 953                                         FB_EVENT_MODE_CHANGE_ALL :
 954                                         FB_EVENT_MODE_CHANGE;
 955
 956                                 info->flags &= ~FBINFO_MISC_USEREVENT;
 957                                 event.info = info;
 958                                 fb_notifier_call_chain(evnt, &event);
 959                         }
 960                 }
 961         }
 962
 963  done:
 964         return ret;
 965 }
 966
 967 int
 968 fb_blank(struct fb_info *info, int blank)
 969 {
 970         int ret = -EINVAL;
 971
 972         if (blank > FB_BLANK_POWERDOWN)
 973                 blank = FB_BLANK_POWERDOWN;
 974
 975         if (info->fbops->fb_blank)
 976                 ret = info->fbops->fb_blank(blank, info);
 977
 978         if (!ret) {
 979                 struct fb_event event;
 980
 981                 event.info = info;
 982                 event.data = &blank;
 983                 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
 984         }
 985
 986         return ret;
 987 }
 988
 989 static int
 990 fb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
 991          unsigned long arg)
 992 {
 993         int fbidx = iminor(inode);
 994         struct fb_info *info = registered_fb[fbidx];
 995         struct fb_ops *fb = info->fbops;
 996         struct fb_var_screeninfo var;
 997         struct fb_fix_screeninfo fix;
 998         struct fb_con2fbmap con2fb;
 999         struct fb_cmap_user cmap;
1000         struct fb_event event;
1001         void __user *argp = (void __user *)arg;
1002         int i;
1003
1004         if (!fb)
1005                 return -ENODEV;
1006         switch (cmd) {
1007         case FBIOGET_VSCREENINFO:
1008                 return copy_to_user(argp, &info->var,
1009                                     sizeof(var)) ? -EFAULT : 0;
1010         case FBIOPUT_VSCREENINFO:
1011                 if (copy_from_user(&var, argp, sizeof(var)))
1012                         return -EFAULT;
1013                 acquire_console_sem();
1014                 info->flags |= FBINFO_MISC_USEREVENT;
1015                 i = fb_set_var(info, &var);
1016                 info->flags &= ~FBINFO_MISC_USEREVENT;
1017                 release_console_sem();
1018                 if (i) return i;
1019                 if (copy_to_user(argp, &var, sizeof(var)))
1020                         return -EFAULT;
1021                 return 0;
1022         case FBIOGET_FSCREENINFO:
1023                 return copy_to_user(argp, &info->fix,
1024                                     sizeof(fix)) ? -EFAULT : 0;
1025         case FBIOPUTCMAP:
1026                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1027                         return -EFAULT;
1028                 return (fb_set_user_cmap(&cmap, info));
1029         case FBIOGETCMAP:
1030                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1031                         return -EFAULT;
1032                 return fb_cmap_to_user(&info->cmap, &cmap);
1033         case FBIOPAN_DISPLAY:
1034                 if (copy_from_user(&var, argp, sizeof(var)))
1035                         return -EFAULT;
1036                 acquire_console_sem();
1037                 i = fb_pan_display(info, &var);
1038                 release_console_sem();
1039                 if (i)
1040                         return i;
1041                 if (copy_to_user(argp, &var, sizeof(var)))
1042                         return -EFAULT;
1043                 return 0;
1044         case FBIO_CURSOR:
1045                 return -EINVAL;
1046         case FBIOGET_CON2FBMAP:
1047                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1048                         return -EFAULT;
1049                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1050                     return -EINVAL;
1051                 con2fb.framebuffer = -1;
1052                 event.info = info;
1053                 event.data = &con2fb;
1054                 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
1055                 return copy_to_user(argp, &con2fb,
1056                                     sizeof(con2fb)) ? -EFAULT : 0;
1057         case FBIOPUT_CON2FBMAP:
1058                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1059                         return - EFAULT;
1060                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1061                     return -EINVAL;
1062                 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
1063                     return -EINVAL;
1064 #ifdef CONFIG_KMOD
1065                 if (!registered_fb[con2fb.framebuffer])
1066                     try_to_load(con2fb.framebuffer);
1067 #endif /* CONFIG_KMOD */
1068                 if (!registered_fb[con2fb.framebuffer])
1069                     return -EINVAL;
1070                 event.info = info;
1071                 event.data = &con2fb;
1072                 return fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP,
1073                                               &event);
1074         case FBIOBLANK:
1075                 acquire_console_sem();
1076                 info->flags |= FBINFO_MISC_USEREVENT;
1077                 i = fb_blank(info, arg);
1078                 info->flags &= ~FBINFO_MISC_USEREVENT;
1079                 release_console_sem();
1080                 return i;
1081         default:
1082                 if (fb->fb_ioctl == NULL)
1083                         return -EINVAL;
1084                 return fb->fb_ioctl(info, cmd, arg);
1085         }
1086 }
1087
1088 #ifdef CONFIG_COMPAT
1089 struct fb_fix_screeninfo32 {
1090         char                    id[16];
1091         compat_caddr_t          smem_start;
1092         u32                     smem_len;
1093         u32                     type;
1094         u32                     type_aux;
1095         u32                     visual;
1096         u16                     xpanstep;
1097         u16                     ypanstep;
1098         u16                     ywrapstep;
1099         u32                     line_length;
1100         compat_caddr_t          mmio_start;
1101         u32                     mmio_len;
1102         u32                     accel;
1103         u16                     reserved[3];
1104 };
1105
1106 struct fb_cmap32 {
1107         u32                     start;
1108         u32                     len;
1109         compat_caddr_t  red;
1110         compat_caddr_t  green;
1111         compat_caddr_t  blue;
1112         compat_caddr_t  transp;
1113 };
1114
1115 static int fb_getput_cmap(struct inode *inode, struct file *file,
1116                         unsigned int cmd, unsigned long arg)
1117 {
1118         struct fb_cmap_user __user *cmap;
1119         struct fb_cmap32 __user *cmap32;
1120         __u32 data;
1121         int err;
1122
1123         cmap = compat_alloc_user_space(sizeof(*cmap));
1124         cmap32 = compat_ptr(arg);
1125
1126         if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1127                 return -EFAULT;
1128
1129         if (get_user(data, &cmap32->red) ||
1130             put_user(compat_ptr(data), &cmap->red) ||
1131             get_user(data, &cmap32->green) ||
1132             put_user(compat_ptr(data), &cmap->green) ||
1133             get_user(data, &cmap32->blue) ||
1134             put_user(compat_ptr(data), &cmap->blue) ||
1135             get_user(data, &cmap32->transp) ||
1136             put_user(compat_ptr(data), &cmap->transp))
1137                 return -EFAULT;
1138
1139         err = fb_ioctl(inode, file, cmd, (unsigned long) cmap);
1140
1141         if (!err) {
1142                 if (copy_in_user(&cmap32->start,
1143                                  &cmap->start,
1144                                  2 * sizeof(__u32)))
1145                         err = -EFAULT;
1146         }
1147         return err;
1148 }
1149
1150 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1151                                   struct fb_fix_screeninfo32 __user *fix32)
1152 {
1153         __u32 data;
1154         int err;
1155
1156         err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1157
1158         data = (__u32) (unsigned long) fix->smem_start;
1159         err |= put_user(data, &fix32->smem_start);
1160
1161         err |= put_user(fix->smem_len, &fix32->smem_len);
1162         err |= put_user(fix->type, &fix32->type);
1163         err |= put_user(fix->type_aux, &fix32->type_aux);
1164         err |= put_user(fix->visual, &fix32->visual);
1165         err |= put_user(fix->xpanstep, &fix32->xpanstep);
1166         err |= put_user(fix->ypanstep, &fix32->ypanstep);
1167         err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1168         err |= put_user(fix->line_length, &fix32->line_length);
1169
1170         data = (__u32) (unsigned long) fix->mmio_start;
1171         err |= put_user(data, &fix32->mmio_start);
1172
1173         err |= put_user(fix->mmio_len, &fix32->mmio_len);
1174         err |= put_user(fix->accel, &fix32->accel);
1175         err |= copy_to_user(fix32->reserved, fix->reserved,
1176                             sizeof(fix->reserved));
1177
1178         return err;
1179 }
1180
1181 static int fb_get_fscreeninfo(struct inode *inode, struct file *file,
1182                                 unsigned int cmd, unsigned long arg)
1183 {
1184         mm_segment_t old_fs;
1185         struct fb_fix_screeninfo fix;
1186         struct fb_fix_screeninfo32 __user *fix32;
1187         int err;
1188
1189         fix32 = compat_ptr(arg);
1190
1191         old_fs = get_fs();
1192         set_fs(KERNEL_DS);
1193         err = fb_ioctl(inode, file, cmd, (unsigned long) &fix);
1194         set_fs(old_fs);
1195
1196         if (!err)
1197                 err = do_fscreeninfo_to_user(&fix, fix32);
1198
1199         return err;
1200 }
1201
1202 static long
1203 fb_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1204 {
1205         struct inode *inode = file->f_path.dentry->d_inode;
1206         int fbidx = iminor(inode);
1207         struct fb_info *info = registered_fb[fbidx];
1208         struct fb_ops *fb = info->fbops;
1209         long ret = -ENOIOCTLCMD;
1210
1211         lock_kernel();
1212         switch(cmd) {
1213         case FBIOGET_VSCREENINFO:
1214         case FBIOPUT_VSCREENINFO:
1215         case FBIOPAN_DISPLAY:
1216         case FBIOGET_CON2FBMAP:
1217         case FBIOPUT_CON2FBMAP:
1218                 arg = (unsigned long) compat_ptr(arg);
1219         case FBIOBLANK:
1220                 ret = fb_ioctl(inode, file, cmd, arg);
1221                 break;
1222
1223         case FBIOGET_FSCREENINFO:
1224                 ret = fb_get_fscreeninfo(inode, file, cmd, arg);
1225                 break;
1226
1227         case FBIOGETCMAP:
1228         case FBIOPUTCMAP:
1229                 ret = fb_getput_cmap(inode, file, cmd, arg);
1230                 break;
1231
1232         default:
1233                 if (fb->fb_compat_ioctl)
1234                         ret = fb->fb_compat_ioctl(info, cmd, arg);
1235                 break;
1236         }
1237         unlock_kernel();
1238         return ret;
1239 }
1240 #endif
1241
1242 static int
1243 fb_mmap(struct file *file, struct vm_area_struct * vma)
1244 {
1245         int fbidx = iminor(file->f_path.dentry->d_inode);
1246         struct fb_info *info = registered_fb[fbidx];
1247         struct fb_ops *fb = info->fbops;
1248         unsigned long off;
1249         unsigned long start;
1250         u32 len;
1251
1252         if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
1253                 return -EINVAL;
1254         off = vma->vm_pgoff << PAGE_SHIFT;
1255         if (!fb)
1256                 return -ENODEV;
1257         if (fb->fb_mmap) {
1258                 int res;
1259                 lock_kernel();
1260                 res = fb->fb_mmap(info, vma);
1261                 unlock_kernel();
1262                 return res;
1263         }
1264
1265         lock_kernel();
1266
1267         /* frame buffer memory */
1268         start = info->fix.smem_start;
1269         len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
1270         if (off >= len) {
1271                 /* memory mapped io */
1272                 off -= len;
1273                 if (info->var.accel_flags) {
1274                         unlock_kernel();
1275                         return -EINVAL;
1276                 }
1277                 start = info->fix.mmio_start;
1278                 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
1279         }
1280         unlock_kernel();
1281         start &= PAGE_MASK;
1282         if ((vma->vm_end - vma->vm_start + off) > len)
1283                 return -EINVAL;
1284         off += start;
1285         vma->vm_pgoff = off >> PAGE_SHIFT;
1286         /* This is an IO map - tell maydump to skip this VMA */
1287         vma->vm_flags |= VM_IO | VM_RESERVED;
1288         fb_pgprotect(file, vma, off);
1289         if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1290                              vma->vm_end - vma->vm_start, vma->vm_page_prot))
1291                 return -EAGAIN;
1292         return 0;
1293 }
1294
1295 static int
1296 fb_open(struct inode *inode, struct file *file)
1297 {
1298         int fbidx = iminor(inode);
1299         struct fb_info *info;
1300         int res = 0;
1301
1302         if (fbidx >= FB_MAX)
1303                 return -ENODEV;
1304 #ifdef CONFIG_KMOD
1305         if (!(info = registered_fb[fbidx]))
1306                 try_to_load(fbidx);
1307 #endif /* CONFIG_KMOD */
1308         if (!(info = registered_fb[fbidx]))
1309                 return -ENODEV;
1310         if (!try_module_get(info->fbops->owner))
1311                 return -ENODEV;
1312         file->private_data = info;
1313         if (info->fbops->fb_open) {
1314                 res = info->fbops->fb_open(info,1);
1315                 if (res)
1316                         module_put(info->fbops->owner);
1317         }
1318         return res;
1319 }
1320
1321 static int
1322 fb_release(struct inode *inode, struct file *file)
1323 {
1324         struct fb_info * const info = file->private_data;
1325
1326         lock_kernel();
1327         if (info->fbops->fb_release)
1328                 info->fbops->fb_release(info,1);
1329         module_put(info->fbops->owner);
1330         unlock_kernel();
1331         return 0;
1332 }
1333
1334 static const struct file_operations fb_fops = {
1335         .owner =        THIS_MODULE,
1336         .read =         fb_read,
1337         .write =        fb_write,
1338         .ioctl =        fb_ioctl,
1339 #ifdef CONFIG_COMPAT
1340         .compat_ioctl = fb_compat_ioctl,
1341 #endif
1342         .mmap =         fb_mmap,
1343         .open =         fb_open,
1344         .release =      fb_release,
1345 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1346         .get_unmapped_area = get_fb_unmapped_area,
1347 #endif
1348 #ifdef CONFIG_FB_DEFERRED_IO
1349         .fsync =        fb_deferred_io_fsync,
1350 #endif
1351 };
1352
1353 struct class *fb_class;
1354 EXPORT_SYMBOL(fb_class);
1355
1356 static int fb_check_foreignness(struct fb_info *fi)
1357 {
1358         const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN;
1359
1360         fi->flags &= ~FBINFO_FOREIGN_ENDIAN;
1361
1362 #ifdef __BIG_ENDIAN
1363         fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH;
1364 #else
1365         fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0;
1366 #endif /* __BIG_ENDIAN */
1367
1368         if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) {
1369                 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to "
1370                        "support this framebuffer\n", fi->fix.id);
1371                 return -ENOSYS;
1372         } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) {
1373                 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to "
1374                        "support this framebuffer\n", fi->fix.id);
1375                 return -ENOSYS;
1376         }
1377
1378         return 0;
1379 }
1380
1381 /**
1382  *      register_framebuffer - registers a frame buffer device
1383  *      @fb_info: frame buffer info structure
1384  *
1385  *      Registers a frame buffer device @fb_info.
1386  *
1387  *      Returns negative errno on error, or zero for success.
1388  *
1389  */
1390
1391 int
1392 register_framebuffer(struct fb_info *fb_info)
1393 {
1394         int i;
1395         struct fb_event event;
1396         struct fb_videomode mode;
1397
1398         if (num_registered_fb == FB_MAX)
1399                 return -ENXIO;
1400
1401         if (fb_check_foreignness(fb_info))
1402                 return -ENOSYS;
1403
1404         num_registered_fb++;
1405         for (i = 0 ; i < FB_MAX; i++)
1406                 if (!registered_fb[i])
1407                         break;
1408         fb_info->node = i;
1409
1410         fb_info->dev = device_create(fb_class, fb_info->device,
1411                                      MKDEV(FB_MAJOR, i), "fb%d", i);
1412         if (IS_ERR(fb_info->dev)) {
1413                 /* Not fatal */
1414                 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1415                 fb_info->dev = NULL;
1416         } else
1417                 fb_init_device(fb_info);
1418
1419         if (fb_info->pixmap.addr == NULL) {
1420                 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1421                 if (fb_info->pixmap.addr) {
1422                         fb_info->pixmap.size = FBPIXMAPSIZE;
1423                         fb_info->pixmap.buf_align = 1;
1424                         fb_info->pixmap.scan_align = 1;
1425                         fb_info->pixmap.access_align = 32;
1426                         fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1427                 }
1428         }
1429         fb_info->pixmap.offset = 0;
1430
1431         if (!fb_info->pixmap.blit_x)
1432                 fb_info->pixmap.blit_x = ~(u32)0;
1433
1434         if (!fb_info->pixmap.blit_y)
1435                 fb_info->pixmap.blit_y = ~(u32)0;
1436
1437         if (!fb_info->modelist.prev || !fb_info->modelist.next)
1438                 INIT_LIST_HEAD(&fb_info->modelist);
1439
1440         fb_var_to_videomode(&mode, &fb_info->var);
1441         fb_add_videomode(&mode, &fb_info->modelist);
1442         registered_fb[i] = fb_info;
1443
1444         event.info = fb_info;
1445         fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1446         return 0;
1447 }
1448
1449
1450 /**
1451  *      unregister_framebuffer - releases a frame buffer device
1452  *      @fb_info: frame buffer info structure
1453  *
1454  *      Unregisters a frame buffer device @fb_info.
1455  *
1456  *      Returns negative errno on error, or zero for success.
1457  *
1458  *      This function will also notify the framebuffer console
1459  *      to release the driver.
1460  *
1461  *      This is meant to be called within a driver's module_exit()
1462  *      function. If this is called outside module_exit(), ensure
1463  *      that the driver implements fb_open() and fb_release() to
1464  *      check that no processes are using the device.
1465  */
1466
1467 int
1468 unregister_framebuffer(struct fb_info *fb_info)
1469 {
1470         struct fb_event event;
1471         int i, ret = 0;
1472
1473         i = fb_info->node;
1474         if (!registered_fb[i]) {
1475                 ret = -EINVAL;
1476                 goto done;
1477         }
1478
1479         event.info = fb_info;
1480         ret = fb_notifier_call_chain(FB_EVENT_FB_UNBIND, &event);
1481
1482         if (ret) {
1483                 ret = -EINVAL;
1484                 goto done;
1485         }
1486
1487         if (fb_info->pixmap.addr &&
1488             (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1489                 kfree(fb_info->pixmap.addr);
1490         fb_destroy_modelist(&fb_info->modelist);
1491         registered_fb[i]=NULL;
1492         num_registered_fb--;
1493         fb_cleanup_device(fb_info);
1494         device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1495         event.info = fb_info;
1496         fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1497 done:
1498         return ret;
1499 }
1500
1501 /**
1502  *      fb_set_suspend - low level driver signals suspend
1503  *      @info: framebuffer affected
1504  *      @state: 0 = resuming, !=0 = suspending
1505  *
1506  *      This is meant to be used by low level drivers to
1507  *      signal suspend/resume to the core & clients.
1508  *      It must be called with the console semaphore held
1509  */
1510 void fb_set_suspend(struct fb_info *info, int state)
1511 {
1512         struct fb_event event;
1513
1514         event.info = info;
1515         if (state) {
1516                 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event);
1517                 info->state = FBINFO_STATE_SUSPENDED;
1518         } else {
1519                 info->state = FBINFO_STATE_RUNNING;
1520                 fb_notifier_call_chain(FB_EVENT_RESUME, &event);
1521         }
1522 }
1523
1524 /**
1525  *      fbmem_init - init frame buffer subsystem
1526  *
1527  *      Initialize the frame buffer subsystem.
1528  *
1529  *      NOTE: This function is _only_ to be called by drivers/char/mem.c.
1530  *
1531  */
1532
1533 static int __init
1534 fbmem_init(void)
1535 {
1536         create_proc_read_entry("fb", 0, NULL, fbmem_read_proc, NULL);
1537
1538         if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1539                 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1540
1541         fb_class = class_create(THIS_MODULE, "graphics");
1542         if (IS_ERR(fb_class)) {
1543                 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1544                 fb_class = NULL;
1545         }
1546         return 0;
1547 }
1548
1549 #ifdef MODULE
1550 module_init(fbmem_init);
1551 static void __exit
1552 fbmem_exit(void)
1553 {
1554         remove_proc_entry("fb", NULL);
1555         class_destroy(fb_class);
1556         unregister_chrdev(FB_MAJOR, "fb");
1557 }
1558
1559 module_exit(fbmem_exit);
1560 MODULE_LICENSE("GPL");
1561 MODULE_DESCRIPTION("Framebuffer base");
1562 #else
1563 subsys_initcall(fbmem_init);
1564 #endif
1565
1566 int fb_new_modelist(struct fb_info *info)
1567 {
1568         struct fb_event event;
1569         struct fb_var_screeninfo var = info->var;
1570         struct list_head *pos, *n;
1571         struct fb_modelist *modelist;
1572         struct fb_videomode *m, mode;
1573         int err = 1;
1574
1575         list_for_each_safe(pos, n, &info->modelist) {
1576                 modelist = list_entry(pos, struct fb_modelist, list);
1577                 m = &modelist->mode;
1578                 fb_videomode_to_var(&var, m);
1579                 var.activate = FB_ACTIVATE_TEST;
1580                 err = fb_set_var(info, &var);
1581                 fb_var_to_videomode(&mode, &var);
1582                 if (err || !fb_mode_is_equal(m, &mode)) {
1583                         list_del(pos);
1584                         kfree(pos);
1585                 }
1586         }
1587
1588         err = 1;
1589
1590         if (!list_empty(&info->modelist)) {
1591                 event.info = info;
1592                 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
1593         }
1594
1595         return err;
1596 }
1597
1598 static char *video_options[FB_MAX] __read_mostly;
1599 static int ofonly __read_mostly;
1600
1601 /**
1602  * fb_get_options - get kernel boot parameters
1603  * @name:   framebuffer name as it would appear in
1604  *          the boot parameter line
1605  *          (video=<name>:<options>)
1606  * @option: the option will be stored here
1607  *
1608  * NOTE: Needed to maintain backwards compatibility
1609  */
1610 int fb_get_options(char *name, char **option)
1611 {
1612         char *opt, *options = NULL;
1613         int opt_len, retval = 0;
1614         int name_len = strlen(name), i;
1615
1616         if (name_len && ofonly && strncmp(name, "offb", 4))
1617                 retval = 1;
1618
1619         if (name_len && !retval) {
1620                 for (i = 0; i < FB_MAX; i++) {
1621                         if (video_options[i] == NULL)
1622                                 continue;
1623                         opt_len = strlen(video_options[i]);
1624                         if (!opt_len)
1625                                 continue;
1626                         opt = video_options[i];
1627                         if (!strncmp(name, opt, name_len) &&
1628                             opt[name_len] == ':')
1629                                 options = opt + name_len + 1;
1630                 }
1631         }
1632         if (options && !strncmp(options, "off", 3))
1633                 retval = 1;
1634
1635         if (option)
1636                 *option = options;
1637
1638         return retval;
1639 }
1640
1641 #ifndef MODULE
1642 /**
1643  *      video_setup - process command line options
1644  *      @options: string of options
1645  *
1646  *      Process command line options for frame buffer subsystem.
1647  *
1648  *      NOTE: This function is a __setup and __init function.
1649  *            It only stores the options.  Drivers have to call
1650  *            fb_get_options() as necessary.
1651  *
1652  *      Returns zero.
1653  *
1654  */
1655 static int __init video_setup(char *options)
1656 {
1657         int i, global = 0;
1658
1659         if (!options || !*options)
1660                 global = 1;
1661
1662         if (!global && !strncmp(options, "ofonly", 6)) {
1663                 ofonly = 1;
1664                 global = 1;
1665         }
1666
1667         if (!global && !strstr(options, "fb:")) {
1668                 fb_mode_option = options;
1669                 global = 1;
1670         }
1671
1672         if (!global) {
1673                 for (i = 0; i < FB_MAX; i++) {
1674                         if (video_options[i] == NULL) {
1675                                 video_options[i] = options;
1676                                 break;
1677                         }
1678
1679                 }
1680         }
1681
1682         return 1;
1683 }
1684 __setup("video=", video_setup);
1685 #endif
1686
1687     /*
1688      *  Visible symbols for modules
1689      */
1690
1691 EXPORT_SYMBOL(register_framebuffer);
1692 EXPORT_SYMBOL(unregister_framebuffer);
1693 EXPORT_SYMBOL(num_registered_fb);
1694 EXPORT_SYMBOL(registered_fb);
1695 EXPORT_SYMBOL(fb_show_logo);
1696 EXPORT_SYMBOL(fb_set_var);
1697 EXPORT_SYMBOL(fb_blank);
1698 EXPORT_SYMBOL(fb_pan_display);
1699 EXPORT_SYMBOL(fb_get_buffer_offset);
1700 EXPORT_SYMBOL(fb_set_suspend);
1701 EXPORT_SYMBOL(fb_get_options);
1702
1703 MODULE_LICENSE("GPL");