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