drivers/video/fbmem.c

   1 /*
   2  *  linux/drivers/video/fbmem.c
   3  *
   4  *  Copyright (C) 1994 Martin Schaller
   5  *
   6  *      2001 - Documented with DocBook
   7  *      - Brad Douglas <brad@neruo.com>
   8  *
   9  * This file is subject to the terms and conditions of the GNU General Public
  10  * License.  See the file COPYING in the main directory of this archive
  11  * for more details.
  12  */
  13
  14 #include <linux/module.h>
  15
  16 #include <linux/compat.h>
  17 #include <linux/types.h>
  18 #include <linux/errno.h>
  19 #include <linux/smp_lock.h>
  20 #include <linux/kernel.h>
  21 #include <linux/major.h>
  22 #include <linux/slab.h>
  23 #include <linux/mm.h>
  24 #include <linux/mman.h>
  25 #include <linux/vt.h>
  26 #include <linux/init.h>
  27 #include <linux/linux_logo.h>
  28 #include <linux/proc_fs.h>
  29 #include <linux/seq_file.h>
  30 #include <linux/console.h>
  31 #include <linux/kmod.h>
  32 #include <linux/err.h>
  33 #include <linux/device.h>
  34 #include <linux/efi.h>
  35 #include <linux/fb.h>
  36
  37 #include <asm/fb.h>
  38
  39
  40     /*
  41      *  Frame buffer device initialization and setup routines
  42      */
  43
  44 #define FBPIXMAPSIZE    (1024 * 8)
  45
  46 struct fb_info *registered_fb[FB_MAX] __read_mostly;
  47 int num_registered_fb __read_mostly;
  48
  49 /*
  50  * Helpers
  51  */
  52
  53 int fb_get_color_depth(struct fb_var_screeninfo *var,
  54                        struct fb_fix_screeninfo *fix)
  55 {
  56         int depth = 0;
  57
  58         if (fix->visual == FB_VISUAL_MONO01 ||
  59             fix->visual == FB_VISUAL_MONO10)
  60                 depth = 1;
  61         else {
  62                 if (var->green.length == var->blue.length &&
  63                     var->green.length == var->red.length &&
  64                     var->green.offset == var->blue.offset &&
  65                     var->green.offset == var->red.offset)
  66                         depth = var->green.length;
  67                 else
  68                         depth = var->green.length + var->red.length +
  69                                 var->blue.length;
  70         }
  71
  72         return depth;
  73 }
  74 EXPORT_SYMBOL(fb_get_color_depth);
  75
  76 /*
  77  * Data padding functions.
  78  */
  79 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
  80 {
  81         __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
  82 }
  83 EXPORT_SYMBOL(fb_pad_aligned_buffer);
  84
  85 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
  86                                 u32 shift_high, u32 shift_low, u32 mod)
  87 {
  88         u8 mask = (u8) (0xfff << shift_high), tmp;
  89         int i, j;
  90
  91         for (i = height; i--; ) {
  92                 for (j = 0; j < idx; j++) {
  93                         tmp = dst[j];
  94                         tmp &= mask;
  95                         tmp |= *src >> shift_low;
  96                         dst[j] = tmp;
  97                         tmp = *src << shift_high;
  98                         dst[j+1] = tmp;
  99                         src++;
 100                 }
 101                 tmp = dst[idx];
 102                 tmp &= mask;
 103                 tmp |= *src >> shift_low;
 104                 dst[idx] = tmp;
 105                 if (shift_high < mod) {
 106                         tmp = *src << shift_high;
 107                         dst[idx+1] = tmp;
 108                 }
 109                 src++;
 110                 dst += d_pitch;
 111         }
 112 }
 113 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
 114
 115 /*
 116  * we need to lock this section since fb_cursor
 117  * may use fb_imageblit()
 118  */
 119 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
 120 {
 121         u32 align = buf->buf_align - 1, offset;
 122         char *addr = buf->addr;
 123
 124         /* If IO mapped, we need to sync before access, no sharing of
 125          * the pixmap is done
 126          */
 127         if (buf->flags & FB_PIXMAP_IO) {
 128                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 129                         info->fbops->fb_sync(info);
 130                 return addr;
 131         }
 132
 133         /* See if we fit in the remaining pixmap space */
 134         offset = buf->offset + align;
 135         offset &= ~align;
 136         if (offset + size > buf->size) {
 137                 /* We do not fit. In order to be able to re-use the buffer,
 138                  * we must ensure no asynchronous DMA'ing or whatever operation
 139                  * is in progress, we sync for that.
 140                  */
 141                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 142                         info->fbops->fb_sync(info);
 143                 offset = 0;
 144         }
 145         buf->offset = offset + size;
 146         addr += offset;
 147
 148         return addr;
 149 }
 150
 151 #ifdef CONFIG_LOGO
 152
 153 static inline unsigned safe_shift(unsigned d, int n)
 154 {
 155         return n < 0 ? d >> -n : d << n;
 156 }
 157
 158 static void fb_set_logocmap(struct fb_info *info,
 159                                    const struct linux_logo *logo)
 160 {
 161         struct fb_cmap palette_cmap;
 162         u16 palette_green[16];
 163         u16 palette_blue[16];
 164         u16 palette_red[16];
 165         int i, j, n;
 166         const unsigned char *clut = logo->clut;
 167
 168         palette_cmap.start = 0;
 169         palette_cmap.len = 16;
 170         palette_cmap.red = palette_red;
 171         palette_cmap.green = palette_green;
 172         palette_cmap.blue = palette_blue;
 173         palette_cmap.transp = NULL;
 174
 175         for (i = 0; i < logo->clutsize; i += n) {
 176                 n = logo->clutsize - i;
 177                 /* palette_cmap provides space for only 16 colors at once */
 178                 if (n > 16)
 179                         n = 16;
 180                 palette_cmap.start = 32 + i;
 181                 palette_cmap.len = n;
 182                 for (j = 0; j < n; ++j) {
 183                         palette_cmap.red[j] = clut[0] << 8 | clut[0];
 184                         palette_cmap.green[j] = clut[1] << 8 | clut[1];
 185                         palette_cmap.blue[j] = clut[2] << 8 | clut[2];
 186                         clut += 3;
 187                 }
 188                 fb_set_cmap(&palette_cmap, info);
 189         }
 190 }
 191
 192 static void  fb_set_logo_truepalette(struct fb_info *info,
 193                                             const struct linux_logo *logo,
 194                                             u32 *palette)
 195 {
 196         static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
 197         unsigned char redmask, greenmask, bluemask;
 198         int redshift, greenshift, blueshift;
 199         int i;
 200         const unsigned char *clut = logo->clut;
 201
 202         /*
 203          * We have to create a temporary palette since console palette is only
 204          * 16 colors long.
 205          */
 206         /* Bug: Doesn't obey msb_right ... (who needs that?) */
 207         redmask   = mask[info->var.red.length   < 8 ? info->var.red.length   : 8];
 208         greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
 209         bluemask  = mask[info->var.blue.length  < 8 ? info->var.blue.length  : 8];
 210         redshift   = info->var.red.offset   - (8 - info->var.red.length);
 211         greenshift = info->var.green.offset - (8 - info->var.green.length);
 212         blueshift  = info->var.blue.offset  - (8 - info->var.blue.length);
 213
 214         for ( i = 0; i < logo->clutsize; i++) {
 215                 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
 216                                  safe_shift((clut[1] & greenmask), greenshift) |
 217                                  safe_shift((clut[2] & bluemask), blueshift));
 218                 clut += 3;
 219         }
 220 }
 221
 222 static void fb_set_logo_directpalette(struct fb_info *info,
 223                                              const struct linux_logo *logo,
 224                                              u32 *palette)
 225 {
 226         int redshift, greenshift, blueshift;
 227         int i;
 228
 229         redshift = info->var.red.offset;
 230         greenshift = info->var.green.offset;
 231         blueshift = info->var.blue.offset;
 232
 233         for (i = 32; i < 32 + logo->clutsize; i++)
 234                 palette[i] = i << redshift | i << greenshift | i << blueshift;
 235 }
 236
 237 static void fb_set_logo(struct fb_info *info,
 238                                const struct linux_logo *logo, u8 *dst,
 239                                int depth)
 240 {
 241         int i, j, k;
 242         const u8 *src = logo->data;
 243         u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
 244         u8 fg = 1, d;
 245
 246         switch (fb_get_color_depth(&info->var, &info->fix)) {
 247         case 1:
 248                 fg = 1;
 249                 break;
 250         case 2:
 251                 fg = 3;
 252                 break;
 253         default:
 254                 fg = 7;
 255                 break;
 256         }
 257
 258         if (info->fix.visual == FB_VISUAL_MONO01 ||
 259             info->fix.visual == FB_VISUAL_MONO10)
 260                 fg = ~((u8) (0xfff << info->var.green.length));
 261
 262         switch (depth) {
 263         case 4:
 264                 for (i = 0; i < logo->height; i++)
 265                         for (j = 0; j < logo->width; src++) {
 266                                 *dst++ = *src >> 4;
 267                                 j++;
 268                                 if (j < logo->width) {
 269                                         *dst++ = *src & 0x0f;
 270                                         j++;
 271                                 }
 272                         }
 273                 break;
 274         case 1:
 275                 for (i = 0; i < logo->height; i++) {
 276                         for (j = 0; j < logo->width; src++) {
 277                                 d = *src ^ xor;
 278                                 for (k = 7; k >= 0; k--) {
 279                                         *dst++ = ((d >> k) & 1) ? fg : 0;
 280                                         j++;
 281                                 }
 282                         }
 283                 }
 284                 break;
 285         }
 286 }
 287
 288 /*
 289  * Three (3) kinds of logo maps exist.  linux_logo_clut224 (>16 colors),
 290  * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors).  Depending on
 291  * the visual format and color depth of the framebuffer, the DAC, the
 292  * pseudo_palette, and the logo data will be adjusted accordingly.
 293  *
 294  * Case 1 - linux_logo_clut224:
 295  * Color exceeds the number of console colors (16), thus we set the hardware DAC
 296  * using fb_set_cmap() appropriately.  The "needs_cmapreset"  flag will be set.
 297  *
 298  * For visuals that require color info from the pseudo_palette, we also construct
 299  * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
 300  * will be set.
 301  *
 302  * Case 2 - linux_logo_vga16:
 303  * The number of colors just matches the console colors, thus there is no need
 304  * to set the DAC or the pseudo_palette.  However, the bitmap is packed, ie,
 305  * each byte contains color information for two pixels (upper and lower nibble).
 306  * To be consistent with fb_imageblit() usage, we therefore separate the two
 307  * nibbles into separate bytes. The "depth" flag will be set to 4.
 308  *
 309  * Case 3 - linux_logo_mono:
 310  * This is similar with Case 2.  Each byte contains information for 8 pixels.
 311  * We isolate each bit and expand each into a byte. The "depth" flag will
 312  * be set to 1.
 313  */
 314 static struct logo_data {
 315         int depth;
 316         int needs_directpalette;
 317         int needs_truepalette;
 318         int needs_cmapreset;
 319         const struct linux_logo *logo;
 320 } fb_logo __read_mostly;
 321
 322 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
 323 {
 324         u32 size = width * height, i;
 325
 326         out += size - 1;
 327
 328         for (i = size; i--; )
 329                 *out-- = *in++;
 330 }
 331
 332 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
 333 {
 334         int i, j, h = height - 1;
 335
 336         for (i = 0; i < height; i++)
 337                 for (j = 0; j < width; j++)
 338                                 out[height * j + h - i] = *in++;
 339 }
 340
 341 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
 342 {
 343         int i, j, w = width - 1;
 344
 345         for (i = 0; i < height; i++)
 346                 for (j = 0; j < width; j++)
 347                         out[height * (w - j) + i] = *in++;
 348 }
 349
 350 static void fb_rotate_logo(struct fb_info *info, u8 *dst,
 351                            struct fb_image *image, int rotate)
 352 {
 353         u32 tmp;
 354
 355         if (rotate == FB_ROTATE_UD) {
 356                 fb_rotate_logo_ud(image->data, dst, image->width,
 357                                   image->height);
 358                 image->dx = info->var.xres - image->width - image->dx;
 359                 image->dy = info->var.yres - image->height - image->dy;
 360         } else if (rotate == FB_ROTATE_CW) {
 361                 fb_rotate_logo_cw(image->data, dst, image->width,
 362                                   image->height);
 363                 tmp = image->width;
 364                 image->width = image->height;
 365                 image->height = tmp;
 366                 tmp = image->dy;
 367                 image->dy = image->dx;
 368                 image->dx = info->var.xres - image->width - tmp;
 369         } else if (rotate == FB_ROTATE_CCW) {
 370                 fb_rotate_logo_ccw(image->data, dst, image->width,
 371                                    image->height);
 372                 tmp = image->width;
 373                 image->width = image->height;
 374                 image->height = tmp;
 375                 tmp = image->dx;
 376                 image->dx = image->dy;
 377                 image->dy = info->var.yres - image->height - tmp;
 378         }
 379
 380         image->data = dst;
 381 }
 382
 383 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
 384                             int rotate, unsigned int num)
 385 {
 386         unsigned int x;
 387
 388         if (rotate == FB_ROTATE_UR) {
 389                 for (x = 0;
 390                      x < num && image->dx + image->width <= info->var.xres;
 391                      x++) {
 392                         info->fbops->fb_imageblit(info, image);
 393                         image->dx += image->width + 8;
 394                 }
 395         } else if (rotate == FB_ROTATE_UD) {
 396                 for (x = 0; x < num && image->dx >= 0; x++) {
 397                         info->fbops->fb_imageblit(info, image);
 398                         image->dx -= image->width + 8;
 399                 }
 400         } else if (rotate == FB_ROTATE_CW) {
 401                 for (x = 0;
 402                      x < num && image->dy + image->height <= info->var.yres;
 403                      x++) {
 404                         info->fbops->fb_imageblit(info, image);
 405                         image->dy += image->height + 8;
 406                 }
 407         } else if (rotate == FB_ROTATE_CCW) {
 408                 for (x = 0; x < num && image->dy >= 0; x++) {
 409                         info->fbops->fb_imageblit(info, image);
 410                         image->dy -= image->height + 8;
 411                 }
 412         }
 413 }
 414
 415 static int fb_show_logo_line(struct fb_info *info, int rotate,
 416                              const struct linux_logo *logo, int y,
 417                              unsigned int n)
 418 {
 419         u32 *palette = NULL, *saved_pseudo_palette = NULL;
 420         unsigned char *logo_new = NULL, *logo_rotate = NULL;
 421         struct fb_image image;
 422
 423         /* Return if the frame buffer is not mapped or suspended */
 424         if (logo == NULL || info->state != FBINFO_STATE_RUNNING ||
 425             info->flags & FBINFO_MODULE)
 426                 return 0;
 427
 428         image.depth = 8;
 429         image.data = logo->data;
 430
 431         if (fb_logo.needs_cmapreset)
 432                 fb_set_logocmap(info, logo);
 433
 434         if (fb_logo.needs_truepalette ||
 435             fb_logo.needs_directpalette) {
 436                 palette = kmalloc(256 * 4, GFP_KERNEL);
 437                 if (palette == NULL)
 438                         return 0;
 439
 440                 if (fb_logo.needs_truepalette)
 441                         fb_set_logo_truepalette(info, logo, palette);
 442                 else
 443                         fb_set_logo_directpalette(info, logo, palette);
 444
 445                 saved_pseudo_palette = info->pseudo_palette;
 446                 info->pseudo_palette = palette;
 447         }
 448
 449         if (fb_logo.depth <= 4) {
 450                 logo_new = kmalloc(logo->width * logo->height, GFP_KERNEL);
 451                 if (logo_new == NULL) {
 452                         kfree(palette);
 453                         if (saved_pseudo_palette)
 454                                 info->pseudo_palette = saved_pseudo_palette;
 455                         return 0;
 456                 }
 457                 image.data = logo_new;
 458                 fb_set_logo(info, logo, logo_new, fb_logo.depth);
 459         }
 460
 461         image.dx = 0;
 462         image.dy = y;
 463         image.width = logo->width;
 464         image.height = logo->height;
 465
 466         if (rotate) {
 467                 logo_rotate = kmalloc(logo->width *
 468                                       logo->height, GFP_KERNEL);
 469                 if (logo_rotate)
 470                         fb_rotate_logo(info, logo_rotate, &image, rotate);
 471         }
 472
 473         fb_do_show_logo(info, &image, rotate, n);
 474
 475         kfree(palette);
 476         if (saved_pseudo_palette != NULL)
 477                 info->pseudo_palette = saved_pseudo_palette;
 478         kfree(logo_new);
 479         kfree(logo_rotate);
 480         return logo->height;
 481 }
 482
 483
 484 #ifdef CONFIG_FB_LOGO_EXTRA
 485
 486 #define FB_LOGO_EX_NUM_MAX 10
 487 static struct logo_data_extra {
 488         const struct linux_logo *logo;
 489         unsigned int n;
 490 } fb_logo_ex[FB_LOGO_EX_NUM_MAX];
 491 static unsigned int fb_logo_ex_num;
 492
 493 void fb_append_extra_logo(const struct linux_logo *logo, unsigned int n)
 494 {
 495         if (!n || fb_logo_ex_num == FB_LOGO_EX_NUM_MAX)
 496                 return;
 497
 498         fb_logo_ex[fb_logo_ex_num].logo = logo;
 499         fb_logo_ex[fb_logo_ex_num].n = n;
 500         fb_logo_ex_num++;
 501 }
 502
 503 static int fb_prepare_extra_logos(struct fb_info *info, unsigned int height,
 504                                   unsigned int yres)
 505 {
 506         unsigned int i;
 507
 508         /* FIXME: logo_ex supports only truecolor fb. */
 509         if (info->fix.visual != FB_VISUAL_TRUECOLOR)
 510                 fb_logo_ex_num = 0;
 511
 512         for (i = 0; i < fb_logo_ex_num; i++) {
 513                 if (fb_logo_ex[i].logo->type != fb_logo.logo->type) {
 514                         fb_logo_ex[i].logo = NULL;
 515                         continue;
 516                 }
 517                 height += fb_logo_ex[i].logo->height;
 518                 if (height > yres) {
 519                         height -= fb_logo_ex[i].logo->height;
 520                         fb_logo_ex_num = i;
 521                         break;
 522                 }
 523         }
 524         return height;
 525 }
 526
 527 static int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
 528 {
 529         unsigned int i;
 530
 531         for (i = 0; i < fb_logo_ex_num; i++)
 532                 y += fb_show_logo_line(info, rotate,
 533                                        fb_logo_ex[i].logo, y, fb_logo_ex[i].n);
 534
 535         return y;
 536 }
 537
 538 #else /* !CONFIG_FB_LOGO_EXTRA */
 539
 540 static inline int fb_prepare_extra_logos(struct fb_info *info,
 541                                          unsigned int height,
 542                                          unsigned int yres)
 543 {
 544         return height;
 545 }
 546
 547 static inline int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
 548 {
 549         return y;
 550 }
 551
 552 #endif /* CONFIG_FB_LOGO_EXTRA */
 553
 554
 555 int fb_prepare_logo(struct fb_info *info, int rotate)
 556 {
 557         int depth = fb_get_color_depth(&info->var, &info->fix);
 558         unsigned int yres;
 559
 560         memset(&fb_logo, 0, sizeof(struct logo_data));
 561
 562         if (info->flags & FBINFO_MISC_TILEBLITTING ||
 563             info->flags & FBINFO_MODULE)
 564                 return 0;
 565
 566         if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
 567                 depth = info->var.blue.length;
 568                 if (info->var.red.length < depth)
 569                         depth = info->var.red.length;
 570                 if (info->var.green.length < depth)
 571                         depth = info->var.green.length;
 572         }
 573
 574         if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) {
 575                 /* assume console colormap */
 576                 depth = 4;
 577         }
 578
 579         /* Return if no suitable logo was found */
 580         fb_logo.logo = fb_find_logo(depth);
 581
 582         if (!fb_logo.logo) {
 583                 return 0;
 584         }
 585
 586         if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
 587                 yres = info->var.yres;
 588         else
 589                 yres = info->var.xres;
 590
 591         if (fb_logo.logo->height > yres) {
 592                 fb_logo.logo = NULL;
 593                 return 0;
 594         }
 595
 596         /* What depth we asked for might be different from what we get */
 597         if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
 598                 fb_logo.depth = 8;
 599         else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
 600                 fb_logo.depth = 4;
 601         else
 602                 fb_logo.depth = 1;
 603
 604
 605         if (fb_logo.depth > 4 && depth > 4) {
 606                 switch (info->fix.visual) {
 607                 case FB_VISUAL_TRUECOLOR:
 608                         fb_logo.needs_truepalette = 1;
 609                         break;
 610                 case FB_VISUAL_DIRECTCOLOR:
 611                         fb_logo.needs_directpalette = 1;
 612                         fb_logo.needs_cmapreset = 1;
 613                         break;
 614                 case FB_VISUAL_PSEUDOCOLOR:
 615                         fb_logo.needs_cmapreset = 1;
 616                         break;
 617                 }
 618         }
 619
 620         return fb_prepare_extra_logos(info, fb_logo.logo->height, yres);
 621 }
 622
 623 int fb_show_logo(struct fb_info *info, int rotate)
 624 {
 625         int y;
 626
 627         y = fb_show_logo_line(info, rotate, fb_logo.logo, 0,
 628                               num_online_cpus());
 629         y = fb_show_extra_logos(info, y, rotate);
 630
 631         return y;
 632 }
 633 #else
 634 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
 635 int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
 636 #endif /* CONFIG_LOGO */
 637
 638 static void *fb_seq_start(struct seq_file *m, loff_t *pos)
 639 {
 640         return (*pos < FB_MAX) ? pos : NULL;
 641 }
 642
 643 static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos)
 644 {
 645         (*pos)++;
 646         return (*pos < FB_MAX) ? pos : NULL;
 647 }
 648
 649 static void fb_seq_stop(struct seq_file *m, void *v)
 650 {
 651 }
 652
 653 static int fb_seq_show(struct seq_file *m, void *v)
 654 {
 655         int i = *(loff_t *)v;
 656         struct fb_info *fi = registered_fb[i];
 657
 658         if (fi)
 659                 seq_printf(m, "%d %s\n", fi->node, fi->fix.id);
 660         return 0;
 661 }
 662
 663 static const struct seq_operations proc_fb_seq_ops = {
 664         .start  = fb_seq_start,
 665         .next   = fb_seq_next,
 666         .stop   = fb_seq_stop,
 667         .show   = fb_seq_show,
 668 };
 669
 670 static int proc_fb_open(struct inode *inode, struct file *file)
 671 {
 672         return seq_open(file, &proc_fb_seq_ops);
 673 }
 674
 675 static const struct file_operations fb_proc_fops = {
 676         .owner          = THIS_MODULE,
 677         .open           = proc_fb_open,
 678         .read           = seq_read,
 679         .llseek         = seq_lseek,
 680         .release        = seq_release,
 681 };
 682
 683 static ssize_t
 684 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 685 {
 686         unsigned long p = *ppos;
 687         struct inode *inode = file->f_path.dentry->d_inode;
 688         int fbidx = iminor(inode);
 689         struct fb_info *info = registered_fb[fbidx];
 690         u32 *buffer, *dst;
 691         u32 __iomem *src;
 692         int c, i, cnt = 0, err = 0;
 693         unsigned long total_size;
 694
 695         if (!info || ! info->screen_base)
 696                 return -ENODEV;
 697
 698         if (info->state != FBINFO_STATE_RUNNING)
 699                 return -EPERM;
 700
 701         if (info->fbops->fb_read)
 702                 return info->fbops->fb_read(info, buf, count, ppos);
 703
 704         total_size = info->screen_size;
 705
 706         if (total_size == 0)
 707                 total_size = info->fix.smem_len;
 708
 709         if (p >= total_size)
 710                 return 0;
 711
 712         if (count >= total_size)
 713                 count = total_size;
 714
 715         if (count + p > total_size)
 716                 count = total_size - p;
 717
 718         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 719                          GFP_KERNEL);
 720         if (!buffer)
 721                 return -ENOMEM;
 722
 723         src = (u32 __iomem *) (info->screen_base + p);
 724
 725         if (info->fbops->fb_sync)
 726                 info->fbops->fb_sync(info);
 727
 728         while (count) {
 729                 c  = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 730                 dst = buffer;
 731                 for (i = c >> 2; i--; )
 732                         *dst++ = fb_readl(src++);
 733                 if (c & 3) {
 734                         u8 *dst8 = (u8 *) dst;
 735                         u8 __iomem *src8 = (u8 __iomem *) src;
 736
 737                         for (i = c & 3; i--;)
 738                                 *dst8++ = fb_readb(src8++);
 739
 740                         src = (u32 __iomem *) src8;
 741                 }
 742
 743                 if (copy_to_user(buf, buffer, c)) {
 744                         err = -EFAULT;
 745                         break;
 746                 }
 747                 *ppos += c;
 748                 buf += c;
 749                 cnt += c;
 750                 count -= c;
 751         }
 752
 753         kfree(buffer);
 754
 755         return (err) ? err : cnt;
 756 }
 757
 758 static ssize_t
 759 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 760 {
 761         unsigned long p = *ppos;
 762         struct inode *inode = file->f_path.dentry->d_inode;
 763         int fbidx = iminor(inode);
 764         struct fb_info *info = registered_fb[fbidx];
 765         u32 *buffer, *src;
 766         u32 __iomem *dst;
 767         int c, i, cnt = 0, err = 0;
 768         unsigned long total_size;
 769
 770         if (!info || !info->screen_base)
 771                 return -ENODEV;
 772
 773         if (info->state != FBINFO_STATE_RUNNING)
 774                 return -EPERM;
 775
 776         if (info->fbops->fb_write)
 777                 return info->fbops->fb_write(info, buf, count, ppos);
 778
 779         total_size = info->screen_size;
 780
 781         if (total_size == 0)
 782                 total_size = info->fix.smem_len;
 783
 784         if (p > total_size)
 785                 return -EFBIG;
 786
 787         if (count > total_size) {
 788                 err = -EFBIG;
 789                 count = total_size;
 790         }
 791
 792         if (count + p > total_size) {
 793                 if (!err)
 794                         err = -ENOSPC;
 795
 796                 count = total_size - p;
 797         }
 798
 799         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 800                          GFP_KERNEL);
 801         if (!buffer)
 802                 return -ENOMEM;
 803
 804         dst = (u32 __iomem *) (info->screen_base + p);
 805
 806         if (info->fbops->fb_sync)
 807                 info->fbops->fb_sync(info);
 808
 809         while (count) {
 810                 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 811                 src = buffer;
 812
 813                 if (copy_from_user(src, buf, c)) {
 814                         err = -EFAULT;
 815                         break;
 816                 }
 817
 818                 for (i = c >> 2; i--; )
 819                         fb_writel(*src++, dst++);
 820
 821                 if (c & 3) {
 822                         u8 *src8 = (u8 *) src;
 823                         u8 __iomem *dst8 = (u8 __iomem *) dst;
 824
 825                         for (i = c & 3; i--; )
 826                                 fb_writeb(*src8++, dst8++);
 827
 828                         dst = (u32 __iomem *) dst8;
 829                 }
 830
 831                 *ppos += c;
 832                 buf += c;
 833                 cnt += c;
 834                 count -= c;
 835         }
 836
 837         kfree(buffer);
 838
 839         return (cnt) ? cnt : err;
 840 }
 841
 842 int
 843 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
 844 {
 845         struct fb_fix_screeninfo *fix = &info->fix;
 846         unsigned int yres = info->var.yres;
 847         int err = 0;
 848
 849         if (var->yoffset > 0) {
 850                 if (var->vmode & FB_VMODE_YWRAP) {
 851                         if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
 852                                 err = -EINVAL;
 853                         else
 854                                 yres = 0;
 855                 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
 856                         err = -EINVAL;
 857         }
 858
 859         if (var->xoffset > 0 && (!fix->xpanstep ||
 860                                  (var->xoffset % fix->xpanstep)))
 861                 err = -EINVAL;
 862
 863         if (err || !info->fbops->fb_pan_display ||
 864             var->yoffset + yres > info->var.yres_virtual ||
 865             var->xoffset + info->var.xres > info->var.xres_virtual)
 866                 return -EINVAL;
 867
 868         if ((err = info->fbops->fb_pan_display(var, info)))
 869                 return err;
 870         info->var.xoffset = var->xoffset;
 871         info->var.yoffset = var->yoffset;
 872         if (var->vmode & FB_VMODE_YWRAP)
 873                 info->var.vmode |= FB_VMODE_YWRAP;
 874         else
 875                 info->var.vmode &= ~FB_VMODE_YWRAP;
 876         return 0;
 877 }
 878
 879 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var,
 880                          u32 activate)
 881 {
 882         struct fb_event event;
 883         struct fb_blit_caps caps, fbcaps;
 884         int err = 0;
 885
 886         memset(&caps, 0, sizeof(caps));
 887         memset(&fbcaps, 0, sizeof(fbcaps));
 888         caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0;
 889         event.info = info;
 890         event.data = &caps;
 891         fb_notifier_call_chain(FB_EVENT_GET_REQ, &event);
 892         info->fbops->fb_get_caps(info, &fbcaps, var);
 893
 894         if (((fbcaps.x ^ caps.x) & caps.x) ||
 895             ((fbcaps.y ^ caps.y) & caps.y) ||
 896             (fbcaps.len < caps.len))
 897                 err = -EINVAL;
 898
 899         return err;
 900 }
 901
 902 int
 903 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
 904 {
 905         int flags = info->flags;
 906         int ret = 0;
 907
 908         if (var->activate & FB_ACTIVATE_INV_MODE) {
 909                 struct fb_videomode mode1, mode2;
 910
 911                 fb_var_to_videomode(&mode1, var);
 912                 fb_var_to_videomode(&mode2, &info->var);
 913                 /* make sure we don't delete the videomode of current var */
 914                 ret = fb_mode_is_equal(&mode1, &mode2);
 915
 916                 if (!ret) {
 917                     struct fb_event event;
 918
 919                     event.info = info;
 920                     event.data = &mode1;
 921                     ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event);
 922                 }
 923
 924                 if (!ret)
 925                     fb_delete_videomode(&mode1, &info->modelist);
 926
 927
 928                 ret = (ret) ? -EINVAL : 0;
 929                 goto done;
 930         }
 931
 932         if ((var->activate & FB_ACTIVATE_FORCE) ||
 933             memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
 934                 u32 activate = var->activate;
 935
 936                 if (!info->fbops->fb_check_var) {
 937                         *var = info->var;
 938                         goto done;
 939                 }
 940
 941                 ret = info->fbops->fb_check_var(var, info);
 942
 943                 if (ret)
 944                         goto done;
 945
 946                 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
 947                         struct fb_videomode mode;
 948
 949                         if (info->fbops->fb_get_caps) {
 950                                 ret = fb_check_caps(info, var, activate);
 951
 952                                 if (ret)
 953                                         goto done;
 954                         }
 955
 956                         info->var = *var;
 957
 958                         if (info->fbops->fb_set_par)
 959                                 info->fbops->fb_set_par(info);
 960
 961                         fb_pan_display(info, &info->var);
 962                         fb_set_cmap(&info->cmap, info);
 963                         fb_var_to_videomode(&mode, &info->var);
 964
 965                         if (info->modelist.prev && info->modelist.next &&
 966                             !list_empty(&info->modelist))
 967                                 ret = fb_add_videomode(&mode, &info->modelist);
 968
 969                         if (!ret && (flags & FBINFO_MISC_USEREVENT)) {
 970                                 struct fb_event event;
 971                                 int evnt = (activate & FB_ACTIVATE_ALL) ?
 972                                         FB_EVENT_MODE_CHANGE_ALL :
 973                                         FB_EVENT_MODE_CHANGE;
 974
 975                                 info->flags &= ~FBINFO_MISC_USEREVENT;
 976                                 event.info = info;
 977                                 event.data = &mode;
 978                                 fb_notifier_call_chain(evnt, &event);
 979                         }
 980                 }
 981         }
 982
 983  done:
 984         return ret;
 985 }
 986
 987 int
 988 fb_blank(struct fb_info *info, int blank)
 989 {
 990         int ret = -EINVAL;
 991
 992         if (blank > FB_BLANK_POWERDOWN)
 993                 blank = FB_BLANK_POWERDOWN;
 994
 995         if (info->fbops->fb_blank)
 996                 ret = info->fbops->fb_blank(blank, info);
 997
 998         if (!ret) {
 999                 struct fb_event event;
1000
1001                 event.info = info;
1002                 event.data = &blank;
1003                 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
1004         }
1005
1006         return ret;
1007 }
1008
1009 static long do_fb_ioctl(struct fb_info *info, unsigned int cmd,
1010                         unsigned long arg)
1011 {
1012         struct fb_ops *fb;
1013         struct fb_var_screeninfo var;
1014         struct fb_fix_screeninfo fix;
1015         struct fb_con2fbmap con2fb;
1016         struct fb_cmap cmap_from;
1017         struct fb_cmap_user cmap;
1018         struct fb_event event;
1019         void __user *argp = (void __user *)arg;
1020         long ret = 0;
1021
1022         switch (cmd) {
1023         case FBIOGET_VSCREENINFO:
1024                 if (!lock_fb_info(info))
1025                         return -ENODEV;
1026                 var = info->var;
1027                 unlock_fb_info(info);
1028
1029                 ret = copy_to_user(argp, &var, sizeof(var)) ? -EFAULT : 0;
1030                 break;
1031         case FBIOPUT_VSCREENINFO:
1032                 if (copy_from_user(&var, argp, sizeof(var)))
1033                         return -EFAULT;
1034                 if (!lock_fb_info(info))
1035                         return -ENODEV;
1036                 acquire_console_sem();
1037                 info->flags |= FBINFO_MISC_USEREVENT;
1038                 ret = fb_set_var(info, &var);
1039                 info->flags &= ~FBINFO_MISC_USEREVENT;
1040                 release_console_sem();
1041                 unlock_fb_info(info);
1042                 if (!ret && copy_to_user(argp, &var, sizeof(var)))
1043                         ret = -EFAULT;
1044                 break;
1045         case FBIOGET_FSCREENINFO:
1046                 if (!lock_fb_info(info))
1047                         return -ENODEV;
1048                 fix = info->fix;
1049                 unlock_fb_info(info);
1050
1051                 ret = copy_to_user(argp, &fix, sizeof(fix)) ? -EFAULT : 0;
1052                 break;
1053         case FBIOPUTCMAP:
1054                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1055                         return -EFAULT;
1056                 ret = fb_set_user_cmap(&cmap, info);
1057                 break;
1058         case FBIOGETCMAP:
1059                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1060                         return -EFAULT;
1061                 if (!lock_fb_info(info))
1062                         return -ENODEV;
1063                 cmap_from = info->cmap;
1064                 unlock_fb_info(info);
1065                 ret = fb_cmap_to_user(&cmap_from, &cmap);
1066                 break;
1067         case FBIOPAN_DISPLAY:
1068                 if (copy_from_user(&var, argp, sizeof(var)))
1069                         return -EFAULT;
1070                 if (!lock_fb_info(info))
1071                         return -ENODEV;
1072                 acquire_console_sem();
1073                 ret = fb_pan_display(info, &var);
1074                 release_console_sem();
1075                 unlock_fb_info(info);
1076                 if (ret == 0 && copy_to_user(argp, &var, sizeof(var)))
1077                         return -EFAULT;
1078                 break;
1079         case FBIO_CURSOR:
1080                 ret = -EINVAL;
1081                 break;
1082         case FBIOGET_CON2FBMAP:
1083                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1084                         return -EFAULT;
1085                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1086                         return -EINVAL;
1087                 con2fb.framebuffer = -1;
1088                 event.data = &con2fb;
1089                 event.info = info;
1090                 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
1091                 ret = copy_to_user(argp, &con2fb, sizeof(con2fb)) ? -EFAULT : 0;
1092                 break;
1093         case FBIOPUT_CON2FBMAP:
1094                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1095                         return -EFAULT;
1096                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1097                         return -EINVAL;
1098                 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
1099                         return -EINVAL;
1100                 if (!registered_fb[con2fb.framebuffer])
1101                         request_module("fb%d", con2fb.framebuffer);
1102                 if (!registered_fb[con2fb.framebuffer]) {
1103                         ret = -EINVAL;
1104                         break;
1105                 }
1106                 event.data = &con2fb;
1107                 event.info = info;
1108                 ret = fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP, &event);
1109                 break;
1110         case FBIOBLANK:
1111                 if (!lock_fb_info(info))
1112                         return -ENODEV;
1113                 acquire_console_sem();
1114                 info->flags |= FBINFO_MISC_USEREVENT;
1115                 ret = fb_blank(info, arg);
1116                 info->flags &= ~FBINFO_MISC_USEREVENT;
1117                 release_console_sem();
1118                 unlock_fb_info(info);
1119                 break;
1120         default:
1121                 if (!lock_fb_info(info))
1122                         return -ENODEV;
1123                 fb = info->fbops;
1124                 if (fb->fb_ioctl)
1125                         ret = fb->fb_ioctl(info, cmd, arg);
1126                 else
1127                         ret = -ENOTTY;
1128                 unlock_fb_info(info);
1129         }
1130         return ret;
1131 }
1132
1133 static long fb_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1134 {
1135         struct inode *inode = file->f_path.dentry->d_inode;
1136         int fbidx = iminor(inode);
1137         struct fb_info *info = registered_fb[fbidx];
1138
1139         return do_fb_ioctl(info, cmd, arg);
1140 }
1141
1142 #ifdef CONFIG_COMPAT
1143 struct fb_fix_screeninfo32 {
1144         char                    id[16];
1145         compat_caddr_t          smem_start;
1146         u32                     smem_len;
1147         u32                     type;
1148         u32                     type_aux;
1149         u32                     visual;
1150         u16                     xpanstep;
1151         u16                     ypanstep;
1152         u16                     ywrapstep;
1153         u32                     line_length;
1154         compat_caddr_t          mmio_start;
1155         u32                     mmio_len;
1156         u32                     accel;
1157         u16                     reserved[3];
1158 };
1159
1160 struct fb_cmap32 {
1161         u32                     start;
1162         u32                     len;
1163         compat_caddr_t  red;
1164         compat_caddr_t  green;
1165         compat_caddr_t  blue;
1166         compat_caddr_t  transp;
1167 };
1168
1169 static int fb_getput_cmap(struct fb_info *info, unsigned int cmd,
1170                           unsigned long arg)
1171 {
1172         struct fb_cmap_user __user *cmap;
1173         struct fb_cmap32 __user *cmap32;
1174         __u32 data;
1175         int err;
1176
1177         cmap = compat_alloc_user_space(sizeof(*cmap));
1178         cmap32 = compat_ptr(arg);
1179
1180         if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1181                 return -EFAULT;
1182
1183         if (get_user(data, &cmap32->red) ||
1184             put_user(compat_ptr(data), &cmap->red) ||
1185             get_user(data, &cmap32->green) ||
1186             put_user(compat_ptr(data), &cmap->green) ||
1187             get_user(data, &cmap32->blue) ||
1188             put_user(compat_ptr(data), &cmap->blue) ||
1189             get_user(data, &cmap32->transp) ||
1190             put_user(compat_ptr(data), &cmap->transp))
1191                 return -EFAULT;
1192
1193         err = do_fb_ioctl(info, cmd, (unsigned long) cmap);
1194
1195         if (!err) {
1196                 if (copy_in_user(&cmap32->start,
1197                                  &cmap->start,
1198                                  2 * sizeof(__u32)))
1199                         err = -EFAULT;
1200         }
1201         return err;
1202 }
1203
1204 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1205                                   struct fb_fix_screeninfo32 __user *fix32)
1206 {
1207         __u32 data;
1208         int err;
1209
1210         err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1211
1212         data = (__u32) (unsigned long) fix->smem_start;
1213         err |= put_user(data, &fix32->smem_start);
1214
1215         err |= put_user(fix->smem_len, &fix32->smem_len);
1216         err |= put_user(fix->type, &fix32->type);
1217         err |= put_user(fix->type_aux, &fix32->type_aux);
1218         err |= put_user(fix->visual, &fix32->visual);
1219         err |= put_user(fix->xpanstep, &fix32->xpanstep);
1220         err |= put_user(fix->ypanstep, &fix32->ypanstep);
1221         err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1222         err |= put_user(fix->line_length, &fix32->line_length);
1223
1224         data = (__u32) (unsigned long) fix->mmio_start;
1225         err |= put_user(data, &fix32->mmio_start);
1226
1227         err |= put_user(fix->mmio_len, &fix32->mmio_len);
1228         err |= put_user(fix->accel, &fix32->accel);
1229         err |= copy_to_user(fix32->reserved, fix->reserved,
1230                             sizeof(fix->reserved));
1231
1232         return err;
1233 }
1234
1235 static int fb_get_fscreeninfo(struct fb_info *info, unsigned int cmd,
1236                               unsigned long arg)
1237 {
1238         mm_segment_t old_fs;
1239         struct fb_fix_screeninfo fix;
1240         struct fb_fix_screeninfo32 __user *fix32;
1241         int err;
1242
1243         fix32 = compat_ptr(arg);
1244
1245         old_fs = get_fs();
1246         set_fs(KERNEL_DS);
1247         err = do_fb_ioctl(info, cmd, (unsigned long) &fix);
1248         set_fs(old_fs);
1249
1250         if (!err)
1251                 err = do_fscreeninfo_to_user(&fix, fix32);
1252
1253         return err;
1254 }
1255
1256 static long fb_compat_ioctl(struct file *file, unsigned int cmd,
1257                             unsigned long arg)
1258 {
1259         struct inode *inode = file->f_path.dentry->d_inode;
1260         int fbidx = iminor(inode);
1261         struct fb_info *info = registered_fb[fbidx];
1262         struct fb_ops *fb = info->fbops;
1263         long ret = -ENOIOCTLCMD;
1264
1265         switch(cmd) {
1266         case FBIOGET_VSCREENINFO:
1267         case FBIOPUT_VSCREENINFO:
1268         case FBIOPAN_DISPLAY:
1269         case FBIOGET_CON2FBMAP:
1270         case FBIOPUT_CON2FBMAP:
1271                 arg = (unsigned long) compat_ptr(arg);
1272         case FBIOBLANK:
1273                 ret = do_fb_ioctl(info, cmd, arg);
1274                 break;
1275
1276         case FBIOGET_FSCREENINFO:
1277                 ret = fb_get_fscreeninfo(info, cmd, arg);
1278                 break;
1279
1280         case FBIOGETCMAP:
1281         case FBIOPUTCMAP:
1282                 ret = fb_getput_cmap(info, cmd, arg);
1283                 break;
1284
1285         default:
1286                 if (fb->fb_compat_ioctl)
1287                         ret = fb->fb_compat_ioctl(info, cmd, arg);
1288                 break;
1289         }
1290         return ret;
1291 }
1292 #endif
1293
1294 static int
1295 fb_mmap(struct file *file, struct vm_area_struct * vma)
1296 __acquires(&info->lock)
1297 __releases(&info->lock)
1298 {
1299         int fbidx = iminor(file->f_path.dentry->d_inode);
1300         struct fb_info *info = registered_fb[fbidx];
1301         struct fb_ops *fb = info->fbops;
1302         unsigned long off;
1303         unsigned long start;
1304         u32 len;
1305
1306         if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
1307                 return -EINVAL;
1308         off = vma->vm_pgoff << PAGE_SHIFT;
1309         if (!fb)
1310                 return -ENODEV;
1311         if (fb->fb_mmap) {
1312                 int res;
1313                 mutex_lock(&info->lock);
1314                 res = fb->fb_mmap(info, vma);
1315                 mutex_unlock(&info->lock);
1316                 return res;
1317         }
1318
1319         mutex_lock(&info->lock);
1320
1321         /* frame buffer memory */
1322         start = info->fix.smem_start;
1323         len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
1324         if (off >= len) {
1325                 /* memory mapped io */
1326                 off -= len;
1327                 if (info->var.accel_flags) {
1328                         mutex_unlock(&info->lock);
1329                         return -EINVAL;
1330                 }
1331                 start = info->fix.mmio_start;
1332                 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
1333         }
1334         mutex_unlock(&info->lock);
1335         start &= PAGE_MASK;
1336         if ((vma->vm_end - vma->vm_start + off) > len)
1337                 return -EINVAL;
1338         off += start;
1339         vma->vm_pgoff = off >> PAGE_SHIFT;
1340         /* This is an IO map - tell maydump to skip this VMA */
1341         vma->vm_flags |= VM_IO | VM_RESERVED;
1342         fb_pgprotect(file, vma, off);
1343         if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1344                              vma->vm_end - vma->vm_start, vma->vm_page_prot))
1345                 return -EAGAIN;
1346         return 0;
1347 }
1348
1349 static int
1350 fb_open(struct inode *inode, struct file *file)
1351 __acquires(&info->lock)
1352 __releases(&info->lock)
1353 {
1354         int fbidx = iminor(inode);
1355         struct fb_info *info;
1356         int res = 0;
1357
1358         if (fbidx >= FB_MAX)
1359                 return -ENODEV;
1360         info = registered_fb[fbidx];
1361         if (!info)
1362                 request_module("fb%d", fbidx);
1363         info = registered_fb[fbidx];
1364         if (!info)
1365                 return -ENODEV;
1366         mutex_lock(&info->lock);
1367         if (!try_module_get(info->fbops->owner)) {
1368                 res = -ENODEV;
1369                 goto out;
1370         }
1371         file->private_data = info;
1372         if (info->fbops->fb_open) {
1373                 res = info->fbops->fb_open(info,1);
1374                 if (res)
1375                         module_put(info->fbops->owner);
1376         }
1377 #ifdef CONFIG_FB_DEFERRED_IO
1378         if (info->fbdefio)
1379                 fb_deferred_io_open(info, inode, file);
1380 #endif
1381 out:
1382         mutex_unlock(&info->lock);
1383         return res;
1384 }
1385
1386 static int
1387 fb_release(struct inode *inode, struct file *file)
1388 __acquires(&info->lock)
1389 __releases(&info->lock)
1390 {
1391         struct fb_info * const info = file->private_data;
1392
1393         mutex_lock(&info->lock);
1394         if (info->fbops->fb_release)
1395                 info->fbops->fb_release(info,1);
1396         module_put(info->fbops->owner);
1397         mutex_unlock(&info->lock);
1398         return 0;
1399 }
1400
1401 static const struct file_operations fb_fops = {
1402         .owner =        THIS_MODULE,
1403         .read =         fb_read,
1404         .write =        fb_write,
1405         .unlocked_ioctl = fb_ioctl,
1406 #ifdef CONFIG_COMPAT
1407         .compat_ioctl = fb_compat_ioctl,
1408 #endif
1409         .mmap =         fb_mmap,
1410         .open =         fb_open,
1411         .release =      fb_release,
1412 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1413         .get_unmapped_area = get_fb_unmapped_area,
1414 #endif
1415 #ifdef CONFIG_FB_DEFERRED_IO
1416         .fsync =        fb_deferred_io_fsync,
1417 #endif
1418 };
1419
1420 struct class *fb_class;
1421 EXPORT_SYMBOL(fb_class);
1422
1423 static int fb_check_foreignness(struct fb_info *fi)
1424 {
1425         const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN;
1426
1427         fi->flags &= ~FBINFO_FOREIGN_ENDIAN;
1428
1429 #ifdef __BIG_ENDIAN
1430         fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH;
1431 #else
1432         fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0;
1433 #endif /* __BIG_ENDIAN */
1434
1435         if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) {
1436                 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to "
1437                        "support this framebuffer\n", fi->fix.id);
1438                 return -ENOSYS;
1439         } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) {
1440                 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to "
1441                        "support this framebuffer\n", fi->fix.id);
1442                 return -ENOSYS;
1443         }
1444
1445         return 0;
1446 }
1447
1448 /**
1449  *      register_framebuffer - registers a frame buffer device
1450  *      @fb_info: frame buffer info structure
1451  *
1452  *      Registers a frame buffer device @fb_info.
1453  *
1454  *      Returns negative errno on error, or zero for success.
1455  *
1456  */
1457
1458 int
1459 register_framebuffer(struct fb_info *fb_info)
1460 {
1461         int i;
1462         struct fb_event event;
1463         struct fb_videomode mode;
1464
1465         if (num_registered_fb == FB_MAX)
1466                 return -ENXIO;
1467
1468         if (fb_check_foreignness(fb_info))
1469                 return -ENOSYS;
1470
1471         num_registered_fb++;
1472         for (i = 0 ; i < FB_MAX; i++)
1473                 if (!registered_fb[i])
1474                         break;
1475         fb_info->node = i;
1476         mutex_init(&fb_info->lock);
1477
1478         fb_info->dev = device_create(fb_class, fb_info->device,
1479                                      MKDEV(FB_MAJOR, i), NULL, "fb%d", i);
1480         if (IS_ERR(fb_info->dev)) {
1481                 /* Not fatal */
1482                 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1483                 fb_info->dev = NULL;
1484         } else
1485                 fb_init_device(fb_info);
1486
1487         if (fb_info->pixmap.addr == NULL) {
1488                 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1489                 if (fb_info->pixmap.addr) {
1490                         fb_info->pixmap.size = FBPIXMAPSIZE;
1491                         fb_info->pixmap.buf_align = 1;
1492                         fb_info->pixmap.scan_align = 1;
1493                         fb_info->pixmap.access_align = 32;
1494                         fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1495                 }
1496         }
1497         fb_info->pixmap.offset = 0;
1498
1499         if (!fb_info->pixmap.blit_x)
1500                 fb_info->pixmap.blit_x = ~(u32)0;
1501
1502         if (!fb_info->pixmap.blit_y)
1503                 fb_info->pixmap.blit_y = ~(u32)0;
1504
1505         if (!fb_info->modelist.prev || !fb_info->modelist.next)
1506                 INIT_LIST_HEAD(&fb_info->modelist);
1507
1508         fb_var_to_videomode(&mode, &fb_info->var);
1509         fb_add_videomode(&mode, &fb_info->modelist);
1510         registered_fb[i] = fb_info;
1511
1512         event.info = fb_info;
1513         fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1514         return 0;
1515 }
1516
1517
1518 /**
1519  *      unregister_framebuffer - releases a frame buffer device
1520  *      @fb_info: frame buffer info structure
1521  *
1522  *      Unregisters a frame buffer device @fb_info.
1523  *
1524  *      Returns negative errno on error, or zero for success.
1525  *
1526  *      This function will also notify the framebuffer console
1527  *      to release the driver.
1528  *
1529  *      This is meant to be called within a driver's module_exit()
1530  *      function. If this is called outside module_exit(), ensure
1531  *      that the driver implements fb_open() and fb_release() to
1532  *      check that no processes are using the device.
1533  */
1534
1535 int
1536 unregister_framebuffer(struct fb_info *fb_info)
1537 {
1538         struct fb_event event;
1539         int i, ret = 0;
1540
1541         i = fb_info->node;
1542         if (!registered_fb[i]) {
1543                 ret = -EINVAL;
1544                 goto done;
1545         }
1546
1547         event.info = fb_info;
1548         ret = fb_notifier_call_chain(FB_EVENT_FB_UNBIND, &event);
1549
1550         if (ret) {
1551                 ret = -EINVAL;
1552                 goto done;
1553         }
1554
1555         if (fb_info->pixmap.addr &&
1556             (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1557                 kfree(fb_info->pixmap.addr);
1558         fb_destroy_modelist(&fb_info->modelist);
1559         registered_fb[i]=NULL;
1560         num_registered_fb--;
1561         fb_cleanup_device(fb_info);
1562         device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1563         event.info = fb_info;
1564         fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1565 done:
1566         return ret;
1567 }
1568
1569 /**
1570  *      fb_set_suspend - low level driver signals suspend
1571  *      @info: framebuffer affected
1572  *      @state: 0 = resuming, !=0 = suspending
1573  *
1574  *      This is meant to be used by low level drivers to
1575  *      signal suspend/resume to the core & clients.
1576  *      It must be called with the console semaphore held
1577  */
1578 void fb_set_suspend(struct fb_info *info, int state)
1579 {
1580         struct fb_event event;
1581
1582         event.info = info;
1583         if (state) {
1584                 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event);
1585                 info->state = FBINFO_STATE_SUSPENDED;
1586         } else {
1587                 info->state = FBINFO_STATE_RUNNING;
1588                 fb_notifier_call_chain(FB_EVENT_RESUME, &event);
1589         }
1590 }
1591
1592 /**
1593  *      fbmem_init - init frame buffer subsystem
1594  *
1595  *      Initialize the frame buffer subsystem.
1596  *
1597  *      NOTE: This function is _only_ to be called by drivers/char/mem.c.
1598  *
1599  */
1600
1601 static int __init
1602 fbmem_init(void)
1603 {
1604         proc_create("fb", 0, NULL, &fb_proc_fops);
1605
1606         if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1607                 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1608
1609         fb_class = class_create(THIS_MODULE, "graphics");
1610         if (IS_ERR(fb_class)) {
1611                 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1612                 fb_class = NULL;
1613         }
1614         return 0;
1615 }
1616
1617 #ifdef MODULE
1618 module_init(fbmem_init);
1619 static void __exit
1620 fbmem_exit(void)
1621 {
1622         remove_proc_entry("fb", NULL);
1623         class_destroy(fb_class);
1624         unregister_chrdev(FB_MAJOR, "fb");
1625 }
1626
1627 module_exit(fbmem_exit);
1628 MODULE_LICENSE("GPL");
1629 MODULE_DESCRIPTION("Framebuffer base");
1630 #else
1631 subsys_initcall(fbmem_init);
1632 #endif
1633
1634 int fb_new_modelist(struct fb_info *info)
1635 {
1636         struct fb_event event;
1637         struct fb_var_screeninfo var = info->var;
1638         struct list_head *pos, *n;
1639         struct fb_modelist *modelist;
1640         struct fb_videomode *m, mode;
1641         int err = 1;
1642
1643         list_for_each_safe(pos, n, &info->modelist) {
1644                 modelist = list_entry(pos, struct fb_modelist, list);
1645                 m = &modelist->mode;
1646                 fb_videomode_to_var(&var, m);
1647                 var.activate = FB_ACTIVATE_TEST;
1648                 err = fb_set_var(info, &var);
1649                 fb_var_to_videomode(&mode, &var);
1650                 if (err || !fb_mode_is_equal(m, &mode)) {
1651                         list_del(pos);
1652                         kfree(pos);
1653                 }
1654         }
1655
1656         err = 1;
1657
1658         if (!list_empty(&info->modelist)) {
1659                 event.info = info;
1660                 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
1661         }
1662
1663         return err;
1664 }
1665
1666 static char *video_options[FB_MAX] __read_mostly;
1667 static int ofonly __read_mostly;
1668
1669 /**
1670  * fb_get_options - get kernel boot parameters
1671  * @name:   framebuffer name as it would appear in
1672  *          the boot parameter line
1673  *          (video=<name>:<options>)
1674  * @option: the option will be stored here
1675  *
1676  * NOTE: Needed to maintain backwards compatibility
1677  */
1678 int fb_get_options(char *name, char **option)
1679 {
1680         char *opt, *options = NULL;
1681         int opt_len, retval = 0;
1682         int name_len = strlen(name), i;
1683
1684         if (name_len && ofonly && strncmp(name, "offb", 4))
1685                 retval = 1;
1686
1687         if (name_len && !retval) {
1688                 for (i = 0; i < FB_MAX; i++) {
1689                         if (video_options[i] == NULL)
1690                                 continue;
1691                         opt_len = strlen(video_options[i]);
1692                         if (!opt_len)
1693                                 continue;
1694                         opt = video_options[i];
1695                         if (!strncmp(name, opt, name_len) &&
1696                             opt[name_len] == ':')
1697                                 options = opt + name_len + 1;
1698                 }
1699         }
1700         if (options && !strncmp(options, "off", 3))
1701                 retval = 1;
1702
1703         if (option)
1704                 *option = options;
1705
1706         return retval;
1707 }
1708
1709 #ifndef MODULE
1710 /**
1711  *      video_setup - process command line options
1712  *      @options: string of options
1713  *
1714  *      Process command line options for frame buffer subsystem.
1715  *
1716  *      NOTE: This function is a __setup and __init function.
1717  *            It only stores the options.  Drivers have to call
1718  *            fb_get_options() as necessary.
1719  *
1720  *      Returns zero.
1721  *
1722  */
1723 static int __init video_setup(char *options)
1724 {
1725         int i, global = 0;
1726
1727         if (!options || !*options)
1728                 global = 1;
1729
1730         if (!global && !strncmp(options, "ofonly", 6)) {
1731                 ofonly = 1;
1732                 global = 1;
1733         }
1734
1735         if (!global && !strstr(options, "fb:")) {
1736                 fb_mode_option = options;
1737                 global = 1;
1738         }
1739
1740         if (!global) {
1741                 for (i = 0; i < FB_MAX; i++) {
1742                         if (video_options[i] == NULL) {
1743                                 video_options[i] = options;
1744                                 break;
1745                         }
1746
1747                 }
1748         }
1749
1750         return 1;
1751 }
1752 __setup("video=", video_setup);
1753 #endif
1754
1755     /*
1756      *  Visible symbols for modules
1757      */
1758
1759 EXPORT_SYMBOL(register_framebuffer);
1760 EXPORT_SYMBOL(unregister_framebuffer);
1761 EXPORT_SYMBOL(num_registered_fb);
1762 EXPORT_SYMBOL(registered_fb);
1763 EXPORT_SYMBOL(fb_show_logo);
1764 EXPORT_SYMBOL(fb_set_var);
1765 EXPORT_SYMBOL(fb_blank);
1766 EXPORT_SYMBOL(fb_pan_display);
1767 EXPORT_SYMBOL(fb_get_buffer_offset);
1768 EXPORT_SYMBOL(fb_set_suspend);
1769 EXPORT_SYMBOL(fb_get_options);
1770
1771 MODULE_LICENSE("GPL");