drivers/video/fbdev/core/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 #include <linux/fbcon.h>
  36 #include <linux/mem_encrypt.h>
  37
  38 #include <asm/fb.h>
  39
  40
  41     /*
  42      *  Frame buffer device initialization and setup routines
  43      */
  44
  45 #define FBPIXMAPSIZE    (1024 * 8)
  46
  47 static DEFINE_MUTEX(registration_lock);
  48
  49 struct fb_info *registered_fb[FB_MAX] __read_mostly;
  50 EXPORT_SYMBOL(registered_fb);
  51
  52 int num_registered_fb __read_mostly;
  53 EXPORT_SYMBOL(num_registered_fb);
  54
  55 static struct fb_info *get_fb_info(unsigned int idx)
  56 {
  57         struct fb_info *fb_info;
  58
  59         if (idx >= FB_MAX)
  60                 return ERR_PTR(-ENODEV);
  61
  62         mutex_lock(&registration_lock);
  63         fb_info = registered_fb[idx];
  64         if (fb_info)
  65                 atomic_inc(&fb_info->count);
  66         mutex_unlock(&registration_lock);
  67
  68         return fb_info;
  69 }
  70
  71 static void put_fb_info(struct fb_info *fb_info)
  72 {
  73         if (!atomic_dec_and_test(&fb_info->count))
  74                 return;
  75         if (fb_info->fbops->fb_destroy)
  76                 fb_info->fbops->fb_destroy(fb_info);
  77 }
  78
  79 int lock_fb_info(struct fb_info *info)
  80 {
  81         mutex_lock(&info->lock);
  82         if (!info->fbops) {
  83                 mutex_unlock(&info->lock);
  84                 return 0;
  85         }
  86         return 1;
  87 }
  88 EXPORT_SYMBOL(lock_fb_info);
  89
  90 /*
  91  * Helpers
  92  */
  93
  94 int fb_get_color_depth(struct fb_var_screeninfo *var,
  95                        struct fb_fix_screeninfo *fix)
  96 {
  97         int depth = 0;
  98
  99         if (fix->visual == FB_VISUAL_MONO01 ||
 100             fix->visual == FB_VISUAL_MONO10)
 101                 depth = 1;
 102         else {
 103                 if (var->green.length == var->blue.length &&
 104                     var->green.length == var->red.length &&
 105                     var->green.offset == var->blue.offset &&
 106                     var->green.offset == var->red.offset)
 107                         depth = var->green.length;
 108                 else
 109                         depth = var->green.length + var->red.length +
 110                                 var->blue.length;
 111         }
 112
 113         return depth;
 114 }
 115 EXPORT_SYMBOL(fb_get_color_depth);
 116
 117 /*
 118  * Data padding functions.
 119  */
 120 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
 121 {
 122         __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
 123 }
 124 EXPORT_SYMBOL(fb_pad_aligned_buffer);
 125
 126 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
 127                                 u32 shift_high, u32 shift_low, u32 mod)
 128 {
 129         u8 mask = (u8) (0xfff << shift_high), tmp;
 130         int i, j;
 131
 132         for (i = height; i--; ) {
 133                 for (j = 0; j < idx; j++) {
 134                         tmp = dst[j];
 135                         tmp &= mask;
 136                         tmp |= *src >> shift_low;
 137                         dst[j] = tmp;
 138                         tmp = *src << shift_high;
 139                         dst[j+1] = tmp;
 140                         src++;
 141                 }
 142                 tmp = dst[idx];
 143                 tmp &= mask;
 144                 tmp |= *src >> shift_low;
 145                 dst[idx] = tmp;
 146                 if (shift_high < mod) {
 147                         tmp = *src << shift_high;
 148                         dst[idx+1] = tmp;
 149                 }
 150                 src++;
 151                 dst += d_pitch;
 152         }
 153 }
 154 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
 155
 156 /*
 157  * we need to lock this section since fb_cursor
 158  * may use fb_imageblit()
 159  */
 160 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
 161 {
 162         u32 align = buf->buf_align - 1, offset;
 163         char *addr = buf->addr;
 164
 165         /* If IO mapped, we need to sync before access, no sharing of
 166          * the pixmap is done
 167          */
 168         if (buf->flags & FB_PIXMAP_IO) {
 169                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 170                         info->fbops->fb_sync(info);
 171                 return addr;
 172         }
 173
 174         /* See if we fit in the remaining pixmap space */
 175         offset = buf->offset + align;
 176         offset &= ~align;
 177         if (offset + size > buf->size) {
 178                 /* We do not fit. In order to be able to re-use the buffer,
 179                  * we must ensure no asynchronous DMA'ing or whatever operation
 180                  * is in progress, we sync for that.
 181                  */
 182                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 183                         info->fbops->fb_sync(info);
 184                 offset = 0;
 185         }
 186         buf->offset = offset + size;
 187         addr += offset;
 188
 189         return addr;
 190 }
 191 EXPORT_SYMBOL(fb_get_buffer_offset);
 192
 193 #ifdef CONFIG_LOGO
 194
 195 static inline unsigned safe_shift(unsigned d, int n)
 196 {
 197         return n < 0 ? d >> -n : d << n;
 198 }
 199
 200 static void fb_set_logocmap(struct fb_info *info,
 201                                    const struct linux_logo *logo)
 202 {
 203         struct fb_cmap palette_cmap;
 204         u16 palette_green[16];
 205         u16 palette_blue[16];
 206         u16 palette_red[16];
 207         int i, j, n;
 208         const unsigned char *clut = logo->clut;
 209
 210         palette_cmap.start = 0;
 211         palette_cmap.len = 16;
 212         palette_cmap.red = palette_red;
 213         palette_cmap.green = palette_green;
 214         palette_cmap.blue = palette_blue;
 215         palette_cmap.transp = NULL;
 216
 217         for (i = 0; i < logo->clutsize; i += n) {
 218                 n = logo->clutsize - i;
 219                 /* palette_cmap provides space for only 16 colors at once */
 220                 if (n > 16)
 221                         n = 16;
 222                 palette_cmap.start = 32 + i;
 223                 palette_cmap.len = n;
 224                 for (j = 0; j < n; ++j) {
 225                         palette_cmap.red[j] = clut[0] << 8 | clut[0];
 226                         palette_cmap.green[j] = clut[1] << 8 | clut[1];
 227                         palette_cmap.blue[j] = clut[2] << 8 | clut[2];
 228                         clut += 3;
 229                 }
 230                 fb_set_cmap(&palette_cmap, info);
 231         }
 232 }
 233
 234 static void  fb_set_logo_truepalette(struct fb_info *info,
 235                                             const struct linux_logo *logo,
 236                                             u32 *palette)
 237 {
 238         static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
 239         unsigned char redmask, greenmask, bluemask;
 240         int redshift, greenshift, blueshift;
 241         int i;
 242         const unsigned char *clut = logo->clut;
 243
 244         /*
 245          * We have to create a temporary palette since console palette is only
 246          * 16 colors long.
 247          */
 248         /* Bug: Doesn't obey msb_right ... (who needs that?) */
 249         redmask   = mask[info->var.red.length   < 8 ? info->var.red.length   : 8];
 250         greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
 251         bluemask  = mask[info->var.blue.length  < 8 ? info->var.blue.length  : 8];
 252         redshift   = info->var.red.offset   - (8 - info->var.red.length);
 253         greenshift = info->var.green.offset - (8 - info->var.green.length);
 254         blueshift  = info->var.blue.offset  - (8 - info->var.blue.length);
 255
 256         for ( i = 0; i < logo->clutsize; i++) {
 257                 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
 258                                  safe_shift((clut[1] & greenmask), greenshift) |
 259                                  safe_shift((clut[2] & bluemask), blueshift));
 260                 clut += 3;
 261         }
 262 }
 263
 264 static void fb_set_logo_directpalette(struct fb_info *info,
 265                                              const struct linux_logo *logo,
 266                                              u32 *palette)
 267 {
 268         int redshift, greenshift, blueshift;
 269         int i;
 270
 271         redshift = info->var.red.offset;
 272         greenshift = info->var.green.offset;
 273         blueshift = info->var.blue.offset;
 274
 275         for (i = 32; i < 32 + logo->clutsize; i++)
 276                 palette[i] = i << redshift | i << greenshift | i << blueshift;
 277 }
 278
 279 static void fb_set_logo(struct fb_info *info,
 280                                const struct linux_logo *logo, u8 *dst,
 281                                int depth)
 282 {
 283         int i, j, k;
 284         const u8 *src = logo->data;
 285         u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
 286         u8 fg = 1, d;
 287
 288         switch (fb_get_color_depth(&info->var, &info->fix)) {
 289         case 1:
 290                 fg = 1;
 291                 break;
 292         case 2:
 293                 fg = 3;
 294                 break;
 295         default:
 296                 fg = 7;
 297                 break;
 298         }
 299
 300         if (info->fix.visual == FB_VISUAL_MONO01 ||
 301             info->fix.visual == FB_VISUAL_MONO10)
 302                 fg = ~((u8) (0xfff << info->var.green.length));
 303
 304         switch (depth) {
 305         case 4:
 306                 for (i = 0; i < logo->height; i++)
 307                         for (j = 0; j < logo->width; src++) {
 308                                 *dst++ = *src >> 4;
 309                                 j++;
 310                                 if (j < logo->width) {
 311                                         *dst++ = *src & 0x0f;
 312                                         j++;
 313                                 }
 314                         }
 315                 break;
 316         case 1:
 317                 for (i = 0; i < logo->height; i++) {
 318                         for (j = 0; j < logo->width; src++) {
 319                                 d = *src ^ xor;
 320                                 for (k = 7; k >= 0 && j < logo->width; k--) {
 321                                         *dst++ = ((d >> k) & 1) ? fg : 0;
 322                                         j++;
 323                                 }
 324                         }
 325                 }
 326                 break;
 327         }
 328 }
 329
 330 /*
 331  * Three (3) kinds of logo maps exist.  linux_logo_clut224 (>16 colors),
 332  * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors).  Depending on
 333  * the visual format and color depth of the framebuffer, the DAC, the
 334  * pseudo_palette, and the logo data will be adjusted accordingly.
 335  *
 336  * Case 1 - linux_logo_clut224:
 337  * Color exceeds the number of console colors (16), thus we set the hardware DAC
 338  * using fb_set_cmap() appropriately.  The "needs_cmapreset"  flag will be set.
 339  *
 340  * For visuals that require color info from the pseudo_palette, we also construct
 341  * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
 342  * will be set.
 343  *
 344  * Case 2 - linux_logo_vga16:
 345  * The number of colors just matches the console colors, thus there is no need
 346  * to set the DAC or the pseudo_palette.  However, the bitmap is packed, ie,
 347  * each byte contains color information for two pixels (upper and lower nibble).
 348  * To be consistent with fb_imageblit() usage, we therefore separate the two
 349  * nibbles into separate bytes. The "depth" flag will be set to 4.
 350  *
 351  * Case 3 - linux_logo_mono:
 352  * This is similar with Case 2.  Each byte contains information for 8 pixels.
 353  * We isolate each bit and expand each into a byte. The "depth" flag will
 354  * be set to 1.
 355  */
 356 static struct logo_data {
 357         int depth;
 358         int needs_directpalette;
 359         int needs_truepalette;
 360         int needs_cmapreset;
 361         const struct linux_logo *logo;
 362 } fb_logo __read_mostly;
 363
 364 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
 365 {
 366         u32 size = width * height, i;
 367
 368         out += size - 1;
 369
 370         for (i = size; i--; )
 371                 *out-- = *in++;
 372 }
 373
 374 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
 375 {
 376         int i, j, h = height - 1;
 377
 378         for (i = 0; i < height; i++)
 379                 for (j = 0; j < width; j++)
 380                                 out[height * j + h - i] = *in++;
 381 }
 382
 383 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
 384 {
 385         int i, j, w = width - 1;
 386
 387         for (i = 0; i < height; i++)
 388                 for (j = 0; j < width; j++)
 389                         out[height * (w - j) + i] = *in++;
 390 }
 391
 392 static void fb_rotate_logo(struct fb_info *info, u8 *dst,
 393                            struct fb_image *image, int rotate)
 394 {
 395         u32 tmp;
 396
 397         if (rotate == FB_ROTATE_UD) {
 398                 fb_rotate_logo_ud(image->data, dst, image->width,
 399                                   image->height);
 400                 image->dx = info->var.xres - image->width - image->dx;
 401                 image->dy = info->var.yres - image->height - image->dy;
 402         } else if (rotate == FB_ROTATE_CW) {
 403                 fb_rotate_logo_cw(image->data, dst, image->width,
 404                                   image->height);
 405                 tmp = image->width;
 406                 image->width = image->height;
 407                 image->height = tmp;
 408                 tmp = image->dy;
 409                 image->dy = image->dx;
 410                 image->dx = info->var.xres - image->width - tmp;
 411         } else if (rotate == FB_ROTATE_CCW) {
 412                 fb_rotate_logo_ccw(image->data, dst, image->width,
 413                                    image->height);
 414                 tmp = image->width;
 415                 image->width = image->height;
 416                 image->height = tmp;
 417                 tmp = image->dx;
 418                 image->dx = image->dy;
 419                 image->dy = info->var.yres - image->height - tmp;
 420         }
 421
 422         image->data = dst;
 423 }
 424
 425 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
 426                             int rotate, unsigned int num)
 427 {
 428         unsigned int x;
 429
 430         if (rotate == FB_ROTATE_UR) {
 431                 for (x = 0;
 432                      x < num && image->dx + image->width <= info->var.xres;
 433                      x++) {
 434                         info->fbops->fb_imageblit(info, image);
 435                         image->dx += image->width + 8;
 436                 }
 437         } else if (rotate == FB_ROTATE_UD) {
 438                 for (x = 0; x < num; x++) {
 439                         info->fbops->fb_imageblit(info, image);
 440                         image->dx -= image->width + 8;
 441                 }
 442         } else if (rotate == FB_ROTATE_CW) {
 443                 for (x = 0;
 444                      x < num && image->dy + image->height <= info->var.yres;
 445                      x++) {
 446                         info->fbops->fb_imageblit(info, image);
 447                         image->dy += image->height + 8;
 448                 }
 449         } else if (rotate == FB_ROTATE_CCW) {
 450                 for (x = 0; x < num; x++) {
 451                         info->fbops->fb_imageblit(info, image);
 452                         image->dy -= image->height + 8;
 453                 }
 454         }
 455 }
 456
 457 static int fb_show_logo_line(struct fb_info *info, int rotate,
 458                              const struct linux_logo *logo, int y,
 459                              unsigned int n)
 460 {
 461         u32 *palette = NULL, *saved_pseudo_palette = NULL;
 462         unsigned char *logo_new = NULL, *logo_rotate = NULL;
 463         struct fb_image image;
 464
 465         /* Return if the frame buffer is not mapped or suspended */
 466         if (logo == NULL || info->state != FBINFO_STATE_RUNNING ||
 467             info->fbops->owner)
 468                 return 0;
 469
 470         image.depth = 8;
 471         image.data = logo->data;
 472
 473         if (fb_logo.needs_cmapreset)
 474                 fb_set_logocmap(info, logo);
 475
 476         if (fb_logo.needs_truepalette ||
 477             fb_logo.needs_directpalette) {
 478                 palette = kmalloc(256 * 4, GFP_KERNEL);
 479                 if (palette == NULL)
 480                         return 0;
 481
 482                 if (fb_logo.needs_truepalette)
 483                         fb_set_logo_truepalette(info, logo, palette);
 484                 else
 485                         fb_set_logo_directpalette(info, logo, palette);
 486
 487                 saved_pseudo_palette = info->pseudo_palette;
 488                 info->pseudo_palette = palette;
 489         }
 490
 491         if (fb_logo.depth <= 4) {
 492                 logo_new = kmalloc_array(logo->width, logo->height,
 493                                          GFP_KERNEL);
 494                 if (logo_new == NULL) {
 495                         kfree(palette);
 496                         if (saved_pseudo_palette)
 497                                 info->pseudo_palette = saved_pseudo_palette;
 498                         return 0;
 499                 }
 500                 image.data = logo_new;
 501                 fb_set_logo(info, logo, logo_new, fb_logo.depth);
 502         }
 503
 504         image.dx = 0;
 505         image.dy = y;
 506         image.width = logo->width;
 507         image.height = logo->height;
 508
 509         if (rotate) {
 510                 logo_rotate = kmalloc_array(logo->width, logo->height,
 511                                             GFP_KERNEL);
 512                 if (logo_rotate)
 513                         fb_rotate_logo(info, logo_rotate, &image, rotate);
 514         }
 515
 516         fb_do_show_logo(info, &image, rotate, n);
 517
 518         kfree(palette);
 519         if (saved_pseudo_palette != NULL)
 520                 info->pseudo_palette = saved_pseudo_palette;
 521         kfree(logo_new);
 522         kfree(logo_rotate);
 523         return logo->height;
 524 }
 525
 526
 527 #ifdef CONFIG_FB_LOGO_EXTRA
 528
 529 #define FB_LOGO_EX_NUM_MAX 10
 530 static struct logo_data_extra {
 531         const struct linux_logo *logo;
 532         unsigned int n;
 533 } fb_logo_ex[FB_LOGO_EX_NUM_MAX];
 534 static unsigned int fb_logo_ex_num;
 535
 536 void fb_append_extra_logo(const struct linux_logo *logo, unsigned int n)
 537 {
 538         if (!n || fb_logo_ex_num == FB_LOGO_EX_NUM_MAX)
 539                 return;
 540
 541         fb_logo_ex[fb_logo_ex_num].logo = logo;
 542         fb_logo_ex[fb_logo_ex_num].n = n;
 543         fb_logo_ex_num++;
 544 }
 545
 546 static int fb_prepare_extra_logos(struct fb_info *info, unsigned int height,
 547                                   unsigned int yres)
 548 {
 549         unsigned int i;
 550
 551         /* FIXME: logo_ex supports only truecolor fb. */
 552         if (info->fix.visual != FB_VISUAL_TRUECOLOR)
 553                 fb_logo_ex_num = 0;
 554
 555         for (i = 0; i < fb_logo_ex_num; i++) {
 556                 if (fb_logo_ex[i].logo->type != fb_logo.logo->type) {
 557                         fb_logo_ex[i].logo = NULL;
 558                         continue;
 559                 }
 560                 height += fb_logo_ex[i].logo->height;
 561                 if (height > yres) {
 562                         height -= fb_logo_ex[i].logo->height;
 563                         fb_logo_ex_num = i;
 564                         break;
 565                 }
 566         }
 567         return height;
 568 }
 569
 570 static int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
 571 {
 572         unsigned int i;
 573
 574         for (i = 0; i < fb_logo_ex_num; i++)
 575                 y += fb_show_logo_line(info, rotate,
 576                                        fb_logo_ex[i].logo, y, fb_logo_ex[i].n);
 577
 578         return y;
 579 }
 580
 581 #else /* !CONFIG_FB_LOGO_EXTRA */
 582
 583 static inline int fb_prepare_extra_logos(struct fb_info *info,
 584                                          unsigned int height,
 585                                          unsigned int yres)
 586 {
 587         return height;
 588 }
 589
 590 static inline int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
 591 {
 592         return y;
 593 }
 594
 595 #endif /* CONFIG_FB_LOGO_EXTRA */
 596
 597
 598 int fb_prepare_logo(struct fb_info *info, int rotate)
 599 {
 600         int depth = fb_get_color_depth(&info->var, &info->fix);
 601         unsigned int yres;
 602
 603         memset(&fb_logo, 0, sizeof(struct logo_data));
 604
 605         if (info->flags & FBINFO_MISC_TILEBLITTING ||
 606             info->fbops->owner)
 607                 return 0;
 608
 609         if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
 610                 depth = info->var.blue.length;
 611                 if (info->var.red.length < depth)
 612                         depth = info->var.red.length;
 613                 if (info->var.green.length < depth)
 614                         depth = info->var.green.length;
 615         }
 616
 617         if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) {
 618                 /* assume console colormap */
 619                 depth = 4;
 620         }
 621
 622         /* Return if no suitable logo was found */
 623         fb_logo.logo = fb_find_logo(depth);
 624
 625         if (!fb_logo.logo) {
 626                 return 0;
 627         }
 628
 629         if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
 630                 yres = info->var.yres;
 631         else
 632                 yres = info->var.xres;
 633
 634         if (fb_logo.logo->height > yres) {
 635                 fb_logo.logo = NULL;
 636                 return 0;
 637         }
 638
 639         /* What depth we asked for might be different from what we get */
 640         if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
 641                 fb_logo.depth = 8;
 642         else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
 643                 fb_logo.depth = 4;
 644         else
 645                 fb_logo.depth = 1;
 646
 647
 648         if (fb_logo.depth > 4 && depth > 4) {
 649                 switch (info->fix.visual) {
 650                 case FB_VISUAL_TRUECOLOR:
 651                         fb_logo.needs_truepalette = 1;
 652                         break;
 653                 case FB_VISUAL_DIRECTCOLOR:
 654                         fb_logo.needs_directpalette = 1;
 655                         fb_logo.needs_cmapreset = 1;
 656                         break;
 657                 case FB_VISUAL_PSEUDOCOLOR:
 658                         fb_logo.needs_cmapreset = 1;
 659                         break;
 660                 }
 661         }
 662
 663         return fb_prepare_extra_logos(info, fb_logo.logo->height, yres);
 664 }
 665
 666 int fb_show_logo(struct fb_info *info, int rotate)
 667 {
 668         int y;
 669
 670         y = fb_show_logo_line(info, rotate, fb_logo.logo, 0,
 671                               num_online_cpus());
 672         y = fb_show_extra_logos(info, y, rotate);
 673
 674         return y;
 675 }
 676 #else
 677 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
 678 int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
 679 #endif /* CONFIG_LOGO */
 680 EXPORT_SYMBOL(fb_prepare_logo);
 681 EXPORT_SYMBOL(fb_show_logo);
 682
 683 static void *fb_seq_start(struct seq_file *m, loff_t *pos)
 684 {
 685         mutex_lock(&registration_lock);
 686         return (*pos < FB_MAX) ? pos : NULL;
 687 }
 688
 689 static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos)
 690 {
 691         (*pos)++;
 692         return (*pos < FB_MAX) ? pos : NULL;
 693 }
 694
 695 static void fb_seq_stop(struct seq_file *m, void *v)
 696 {
 697         mutex_unlock(&registration_lock);
 698 }
 699
 700 static int fb_seq_show(struct seq_file *m, void *v)
 701 {
 702         int i = *(loff_t *)v;
 703         struct fb_info *fi = registered_fb[i];
 704
 705         if (fi)
 706                 seq_printf(m, "%d %s\n", fi->node, fi->fix.id);
 707         return 0;
 708 }
 709
 710 static const struct seq_operations proc_fb_seq_ops = {
 711         .start  = fb_seq_start,
 712         .next   = fb_seq_next,
 713         .stop   = fb_seq_stop,
 714         .show   = fb_seq_show,
 715 };
 716
 717 /*
 718  * We hold a reference to the fb_info in file->private_data,
 719  * but if the current registered fb has changed, we don't
 720  * actually want to use it.
 721  *
 722  * So look up the fb_info using the inode minor number,
 723  * and just verify it against the reference we have.
 724  */
 725 static struct fb_info *file_fb_info(struct file *file)
 726 {
 727         struct inode *inode = file_inode(file);
 728         int fbidx = iminor(inode);
 729         struct fb_info *info = registered_fb[fbidx];
 730
 731         if (info != file->private_data)
 732                 info = NULL;
 733         return info;
 734 }
 735
 736 static ssize_t
 737 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 738 {
 739         unsigned long p = *ppos;
 740         struct fb_info *info = file_fb_info(file);
 741         u8 *buffer, *dst;
 742         u8 __iomem *src;
 743         int c, cnt = 0, err = 0;
 744         unsigned long total_size;
 745
 746         if (!info || ! info->screen_base)
 747                 return -ENODEV;
 748
 749         if (info->state != FBINFO_STATE_RUNNING)
 750                 return -EPERM;
 751
 752         if (info->fbops->fb_read)
 753                 return info->fbops->fb_read(info, buf, count, ppos);
 754
 755         total_size = info->screen_size;
 756
 757         if (total_size == 0)
 758                 total_size = info->fix.smem_len;
 759
 760         if (p >= total_size)
 761                 return 0;
 762
 763         if (count >= total_size)
 764                 count = total_size;
 765
 766         if (count + p > total_size)
 767                 count = total_size - p;
 768
 769         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 770                          GFP_KERNEL);
 771         if (!buffer)
 772                 return -ENOMEM;
 773
 774         src = (u8 __iomem *) (info->screen_base + p);
 775
 776         if (info->fbops->fb_sync)
 777                 info->fbops->fb_sync(info);
 778
 779         while (count) {
 780                 c  = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 781                 dst = buffer;
 782                 fb_memcpy_fromfb(dst, src, c);
 783                 dst += c;
 784                 src += c;
 785
 786                 if (copy_to_user(buf, buffer, c)) {
 787                         err = -EFAULT;
 788                         break;
 789                 }
 790                 *ppos += c;
 791                 buf += c;
 792                 cnt += c;
 793                 count -= c;
 794         }
 795
 796         kfree(buffer);
 797
 798         return (err) ? err : cnt;
 799 }
 800
 801 static ssize_t
 802 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 803 {
 804         unsigned long p = *ppos;
 805         struct fb_info *info = file_fb_info(file);
 806         u8 *buffer, *src;
 807         u8 __iomem *dst;
 808         int c, cnt = 0, err = 0;
 809         unsigned long total_size;
 810
 811         if (!info || !info->screen_base)
 812                 return -ENODEV;
 813
 814         if (info->state != FBINFO_STATE_RUNNING)
 815                 return -EPERM;
 816
 817         if (info->fbops->fb_write)
 818                 return info->fbops->fb_write(info, buf, count, ppos);
 819
 820         total_size = info->screen_size;
 821
 822         if (total_size == 0)
 823                 total_size = info->fix.smem_len;
 824
 825         if (p > total_size)
 826                 return -EFBIG;
 827
 828         if (count > total_size) {
 829                 err = -EFBIG;
 830                 count = total_size;
 831         }
 832
 833         if (count + p > total_size) {
 834                 if (!err)
 835                         err = -ENOSPC;
 836
 837                 count = total_size - p;
 838         }
 839
 840         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 841                          GFP_KERNEL);
 842         if (!buffer)
 843                 return -ENOMEM;
 844
 845         dst = (u8 __iomem *) (info->screen_base + p);
 846
 847         if (info->fbops->fb_sync)
 848                 info->fbops->fb_sync(info);
 849
 850         while (count) {
 851                 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 852                 src = buffer;
 853
 854                 if (copy_from_user(src, buf, c)) {
 855                         err = -EFAULT;
 856                         break;
 857                 }
 858
 859                 fb_memcpy_tofb(dst, src, c);
 860                 dst += c;
 861                 src += c;
 862                 *ppos += c;
 863                 buf += c;
 864                 cnt += c;
 865                 count -= c;
 866         }
 867
 868         kfree(buffer);
 869
 870         return (cnt) ? cnt : err;
 871 }
 872
 873 int
 874 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
 875 {
 876         struct fb_fix_screeninfo *fix = &info->fix;
 877         unsigned int yres = info->var.yres;
 878         int err = 0;
 879
 880         if (var->yoffset > 0) {
 881                 if (var->vmode & FB_VMODE_YWRAP) {
 882                         if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
 883                                 err = -EINVAL;
 884                         else
 885                                 yres = 0;
 886                 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
 887                         err = -EINVAL;
 888         }
 889
 890         if (var->xoffset > 0 && (!fix->xpanstep ||
 891                                  (var->xoffset % fix->xpanstep)))
 892                 err = -EINVAL;
 893
 894         if (err || !info->fbops->fb_pan_display ||
 895             var->yoffset > info->var.yres_virtual - yres ||
 896             var->xoffset > info->var.xres_virtual - info->var.xres)
 897                 return -EINVAL;
 898
 899         if ((err = info->fbops->fb_pan_display(var, info)))
 900                 return err;
 901         info->var.xoffset = var->xoffset;
 902         info->var.yoffset = var->yoffset;
 903         if (var->vmode & FB_VMODE_YWRAP)
 904                 info->var.vmode |= FB_VMODE_YWRAP;
 905         else
 906                 info->var.vmode &= ~FB_VMODE_YWRAP;
 907         return 0;
 908 }
 909 EXPORT_SYMBOL(fb_pan_display);
 910
 911 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var,
 912                          u32 activate)
 913 {
 914         struct fb_event event;
 915         struct fb_blit_caps caps, fbcaps;
 916         int err = 0;
 917
 918         memset(&caps, 0, sizeof(caps));
 919         memset(&fbcaps, 0, sizeof(fbcaps));
 920         caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0;
 921         event.info = info;
 922         event.data = &caps;
 923         fb_notifier_call_chain(FB_EVENT_GET_REQ, &event);
 924         info->fbops->fb_get_caps(info, &fbcaps, var);
 925
 926         if (((fbcaps.x ^ caps.x) & caps.x) ||
 927             ((fbcaps.y ^ caps.y) & caps.y) ||
 928             (fbcaps.len < caps.len))
 929                 err = -EINVAL;
 930
 931         return err;
 932 }
 933
 934 int
 935 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
 936 {
 937         int flags = info->flags;
 938         int ret = 0;
 939
 940         if (var->activate & FB_ACTIVATE_INV_MODE) {
 941                 struct fb_videomode mode1, mode2;
 942
 943                 fb_var_to_videomode(&mode1, var);
 944                 fb_var_to_videomode(&mode2, &info->var);
 945                 /* make sure we don't delete the videomode of current var */
 946                 ret = fb_mode_is_equal(&mode1, &mode2);
 947
 948                 if (!ret) {
 949                     struct fb_event event;
 950
 951                     event.info = info;
 952                     event.data = &mode1;
 953                     ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event);
 954                 }
 955
 956                 if (!ret)
 957                     fb_delete_videomode(&mode1, &info->modelist);
 958
 959
 960                 ret = (ret) ? -EINVAL : 0;
 961                 goto done;
 962         }
 963
 964         if ((var->activate & FB_ACTIVATE_FORCE) ||
 965             memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
 966                 u32 activate = var->activate;
 967
 968                 /* When using FOURCC mode, make sure the red, green, blue and
 969                  * transp fields are set to 0.
 970                  */
 971                 if ((info->fix.capabilities & FB_CAP_FOURCC) &&
 972                     var->grayscale > 1) {
 973                         if (var->red.offset     || var->green.offset    ||
 974                             var->blue.offset    || var->transp.offset   ||
 975                             var->red.length     || var->green.length    ||
 976                             var->blue.length    || var->transp.length   ||
 977                             var->red.msb_right  || var->green.msb_right ||
 978                             var->blue.msb_right || var->transp.msb_right)
 979                                 return -EINVAL;
 980                 }
 981
 982                 if (!info->fbops->fb_check_var) {
 983                         *var = info->var;
 984                         goto done;
 985                 }
 986
 987                 ret = info->fbops->fb_check_var(var, info);
 988
 989                 if (ret)
 990                         goto done;
 991
 992                 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
 993                         struct fb_var_screeninfo old_var;
 994                         struct fb_videomode mode;
 995
 996                         if (info->fbops->fb_get_caps) {
 997                                 ret = fb_check_caps(info, var, activate);
 998
 999                                 if (ret)
1000                                         goto done;
1001                         }
1002
1003                         old_var = info->var;
1004                         info->var = *var;
1005
1006                         if (info->fbops->fb_set_par) {
1007                                 ret = info->fbops->fb_set_par(info);
1008
1009                                 if (ret) {
1010                                         info->var = old_var;
1011                                         printk(KERN_WARNING "detected "
1012                                                 "fb_set_par error, "
1013                                                 "error code: %d\n", ret);
1014                                         goto done;
1015                                 }
1016                         }
1017
1018                         fb_pan_display(info, &info->var);
1019                         fb_set_cmap(&info->cmap, info);
1020                         fb_var_to_videomode(&mode, &info->var);
1021
1022                         if (info->modelist.prev && info->modelist.next &&
1023                             !list_empty(&info->modelist))
1024                                 ret = fb_add_videomode(&mode, &info->modelist);
1025
1026                         if (!ret && (flags & FBINFO_MISC_USEREVENT)) {
1027                                 struct fb_event event;
1028                                 int evnt = (activate & FB_ACTIVATE_ALL) ?
1029                                         FB_EVENT_MODE_CHANGE_ALL :
1030                                         FB_EVENT_MODE_CHANGE;
1031
1032                                 info->flags &= ~FBINFO_MISC_USEREVENT;
1033                                 event.info = info;
1034                                 event.data = &mode;
1035                                 fb_notifier_call_chain(evnt, &event);
1036                         }
1037                 }
1038         }
1039
1040  done:
1041         return ret;
1042 }
1043 EXPORT_SYMBOL(fb_set_var);
1044
1045 int
1046 fb_blank(struct fb_info *info, int blank)
1047 {
1048         struct fb_event event;
1049         int ret = -EINVAL, early_ret;
1050
1051         if (blank > FB_BLANK_POWERDOWN)
1052                 blank = FB_BLANK_POWERDOWN;
1053
1054         event.info = info;
1055         event.data = &blank;
1056
1057         early_ret = fb_notifier_call_chain(FB_EARLY_EVENT_BLANK, &event);
1058
1059         if (info->fbops->fb_blank)
1060                 ret = info->fbops->fb_blank(blank, info);
1061
1062         if (!ret)
1063                 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
1064         else {
1065                 /*
1066                  * if fb_blank is failed then revert effects of
1067                  * the early blank event.
1068                  */
1069                 if (!early_ret)
1070                         fb_notifier_call_chain(FB_R_EARLY_EVENT_BLANK, &event);
1071         }
1072
1073         return ret;
1074 }
1075 EXPORT_SYMBOL(fb_blank);
1076
1077 static long do_fb_ioctl(struct fb_info *info, unsigned int cmd,
1078                         unsigned long arg)
1079 {
1080         struct fb_ops *fb;
1081         struct fb_var_screeninfo var;
1082         struct fb_fix_screeninfo fix;
1083         struct fb_con2fbmap con2fb;
1084         struct fb_cmap cmap_from;
1085         struct fb_cmap_user cmap;
1086         struct fb_event event;
1087         void __user *argp = (void __user *)arg;
1088         long ret = 0;
1089
1090         switch (cmd) {
1091         case FBIOGET_VSCREENINFO:
1092                 if (!lock_fb_info(info))
1093                         return -ENODEV;
1094                 var = info->var;
1095                 unlock_fb_info(info);
1096
1097                 ret = copy_to_user(argp, &var, sizeof(var)) ? -EFAULT : 0;
1098                 break;
1099         case FBIOPUT_VSCREENINFO:
1100                 if (copy_from_user(&var, argp, sizeof(var)))
1101                         return -EFAULT;
1102                 console_lock();
1103                 if (!lock_fb_info(info)) {
1104                         console_unlock();
1105                         return -ENODEV;
1106                 }
1107                 info->flags |= FBINFO_MISC_USEREVENT;
1108                 ret = fb_set_var(info, &var);
1109                 info->flags &= ~FBINFO_MISC_USEREVENT;
1110                 unlock_fb_info(info);
1111                 console_unlock();
1112                 if (!ret && copy_to_user(argp, &var, sizeof(var)))
1113                         ret = -EFAULT;
1114                 break;
1115         case FBIOGET_FSCREENINFO:
1116                 if (!lock_fb_info(info))
1117                         return -ENODEV;
1118                 fix = info->fix;
1119                 unlock_fb_info(info);
1120
1121                 ret = copy_to_user(argp, &fix, sizeof(fix)) ? -EFAULT : 0;
1122                 break;
1123         case FBIOPUTCMAP:
1124                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1125                         return -EFAULT;
1126                 ret = fb_set_user_cmap(&cmap, info);
1127                 break;
1128         case FBIOGETCMAP:
1129                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1130                         return -EFAULT;
1131                 if (!lock_fb_info(info))
1132                         return -ENODEV;
1133                 cmap_from = info->cmap;
1134                 unlock_fb_info(info);
1135                 ret = fb_cmap_to_user(&cmap_from, &cmap);
1136                 break;
1137         case FBIOPAN_DISPLAY:
1138                 if (copy_from_user(&var, argp, sizeof(var)))
1139                         return -EFAULT;
1140                 console_lock();
1141                 if (!lock_fb_info(info)) {
1142                         console_unlock();
1143                         return -ENODEV;
1144                 }
1145                 ret = fb_pan_display(info, &var);
1146                 unlock_fb_info(info);
1147                 console_unlock();
1148                 if (ret == 0 && copy_to_user(argp, &var, sizeof(var)))
1149                         return -EFAULT;
1150                 break;
1151         case FBIO_CURSOR:
1152                 ret = -EINVAL;
1153                 break;
1154         case FBIOGET_CON2FBMAP:
1155                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1156                         return -EFAULT;
1157                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1158                         return -EINVAL;
1159                 con2fb.framebuffer = -1;
1160                 event.data = &con2fb;
1161                 if (!lock_fb_info(info))
1162                         return -ENODEV;
1163                 event.info = info;
1164                 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
1165                 unlock_fb_info(info);
1166                 ret = copy_to_user(argp, &con2fb, sizeof(con2fb)) ? -EFAULT : 0;
1167                 break;
1168         case FBIOPUT_CON2FBMAP:
1169                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1170                         return -EFAULT;
1171                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1172                         return -EINVAL;
1173                 if (con2fb.framebuffer >= FB_MAX)
1174                         return -EINVAL;
1175                 if (!registered_fb[con2fb.framebuffer])
1176                         request_module("fb%d", con2fb.framebuffer);
1177                 if (!registered_fb[con2fb.framebuffer]) {
1178                         ret = -EINVAL;
1179                         break;
1180                 }
1181                 event.data = &con2fb;
1182                 console_lock();
1183                 if (!lock_fb_info(info)) {
1184                         console_unlock();
1185                         return -ENODEV;
1186                 }
1187                 event.info = info;
1188                 ret = fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP, &event);
1189                 unlock_fb_info(info);
1190                 console_unlock();
1191                 break;
1192         case FBIOBLANK:
1193                 console_lock();
1194                 if (!lock_fb_info(info)) {
1195                         console_unlock();
1196                         return -ENODEV;
1197                 }
1198                 info->flags |= FBINFO_MISC_USEREVENT;
1199                 ret = fb_blank(info, arg);
1200                 info->flags &= ~FBINFO_MISC_USEREVENT;
1201                 unlock_fb_info(info);
1202                 console_unlock();
1203                 break;
1204         default:
1205                 if (!lock_fb_info(info))
1206                         return -ENODEV;
1207                 fb = info->fbops;
1208                 if (fb->fb_ioctl)
1209                         ret = fb->fb_ioctl(info, cmd, arg);
1210                 else
1211                         ret = -ENOTTY;
1212                 unlock_fb_info(info);
1213         }
1214         return ret;
1215 }
1216
1217 static long fb_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1218 {
1219         struct fb_info *info = file_fb_info(file);
1220
1221         if (!info)
1222                 return -ENODEV;
1223         return do_fb_ioctl(info, cmd, arg);
1224 }
1225
1226 #ifdef CONFIG_COMPAT
1227 struct fb_fix_screeninfo32 {
1228         char                    id[16];
1229         compat_caddr_t          smem_start;
1230         u32                     smem_len;
1231         u32                     type;
1232         u32                     type_aux;
1233         u32                     visual;
1234         u16                     xpanstep;
1235         u16                     ypanstep;
1236         u16                     ywrapstep;
1237         u32                     line_length;
1238         compat_caddr_t          mmio_start;
1239         u32                     mmio_len;
1240         u32                     accel;
1241         u16                     reserved[3];
1242 };
1243
1244 struct fb_cmap32 {
1245         u32                     start;
1246         u32                     len;
1247         compat_caddr_t  red;
1248         compat_caddr_t  green;
1249         compat_caddr_t  blue;
1250         compat_caddr_t  transp;
1251 };
1252
1253 static int fb_getput_cmap(struct fb_info *info, unsigned int cmd,
1254                           unsigned long arg)
1255 {
1256         struct fb_cmap_user __user *cmap;
1257         struct fb_cmap32 __user *cmap32;
1258         __u32 data;
1259         int err;
1260
1261         cmap = compat_alloc_user_space(sizeof(*cmap));
1262         cmap32 = compat_ptr(arg);
1263
1264         if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1265                 return -EFAULT;
1266
1267         if (get_user(data, &cmap32->red) ||
1268             put_user(compat_ptr(data), &cmap->red) ||
1269             get_user(data, &cmap32->green) ||
1270             put_user(compat_ptr(data), &cmap->green) ||
1271             get_user(data, &cmap32->blue) ||
1272             put_user(compat_ptr(data), &cmap->blue) ||
1273             get_user(data, &cmap32->transp) ||
1274             put_user(compat_ptr(data), &cmap->transp))
1275                 return -EFAULT;
1276
1277         err = do_fb_ioctl(info, cmd, (unsigned long) cmap);
1278
1279         if (!err) {
1280                 if (copy_in_user(&cmap32->start,
1281                                  &cmap->start,
1282                                  2 * sizeof(__u32)))
1283                         err = -EFAULT;
1284         }
1285         return err;
1286 }
1287
1288 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1289                                   struct fb_fix_screeninfo32 __user *fix32)
1290 {
1291         __u32 data;
1292         int err;
1293
1294         err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1295
1296         data = (__u32) (unsigned long) fix->smem_start;
1297         err |= put_user(data, &fix32->smem_start);
1298
1299         err |= put_user(fix->smem_len, &fix32->smem_len);
1300         err |= put_user(fix->type, &fix32->type);
1301         err |= put_user(fix->type_aux, &fix32->type_aux);
1302         err |= put_user(fix->visual, &fix32->visual);
1303         err |= put_user(fix->xpanstep, &fix32->xpanstep);
1304         err |= put_user(fix->ypanstep, &fix32->ypanstep);
1305         err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1306         err |= put_user(fix->line_length, &fix32->line_length);
1307
1308         data = (__u32) (unsigned long) fix->mmio_start;
1309         err |= put_user(data, &fix32->mmio_start);
1310
1311         err |= put_user(fix->mmio_len, &fix32->mmio_len);
1312         err |= put_user(fix->accel, &fix32->accel);
1313         err |= copy_to_user(fix32->reserved, fix->reserved,
1314                             sizeof(fix->reserved));
1315
1316         if (err)
1317                 return -EFAULT;
1318         return 0;
1319 }
1320
1321 static int fb_get_fscreeninfo(struct fb_info *info, unsigned int cmd,
1322                               unsigned long arg)
1323 {
1324         struct fb_fix_screeninfo fix;
1325
1326         if (!lock_fb_info(info))
1327                 return -ENODEV;
1328         fix = info->fix;
1329         unlock_fb_info(info);
1330         return do_fscreeninfo_to_user(&fix, compat_ptr(arg));
1331 }
1332
1333 static long fb_compat_ioctl(struct file *file, unsigned int cmd,
1334                             unsigned long arg)
1335 {
1336         struct fb_info *info = file_fb_info(file);
1337         struct fb_ops *fb;
1338         long ret = -ENOIOCTLCMD;
1339
1340         if (!info)
1341                 return -ENODEV;
1342         fb = info->fbops;
1343         switch(cmd) {
1344         case FBIOGET_VSCREENINFO:
1345         case FBIOPUT_VSCREENINFO:
1346         case FBIOPAN_DISPLAY:
1347         case FBIOGET_CON2FBMAP:
1348         case FBIOPUT_CON2FBMAP:
1349                 arg = (unsigned long) compat_ptr(arg);
1350         case FBIOBLANK:
1351                 ret = do_fb_ioctl(info, cmd, arg);
1352                 break;
1353
1354         case FBIOGET_FSCREENINFO:
1355                 ret = fb_get_fscreeninfo(info, cmd, arg);
1356                 break;
1357
1358         case FBIOGETCMAP:
1359         case FBIOPUTCMAP:
1360                 ret = fb_getput_cmap(info, cmd, arg);
1361                 break;
1362
1363         default:
1364                 if (fb->fb_compat_ioctl)
1365                         ret = fb->fb_compat_ioctl(info, cmd, arg);
1366                 break;
1367         }
1368         return ret;
1369 }
1370 #endif
1371
1372 static int
1373 fb_mmap(struct file *file, struct vm_area_struct * vma)
1374 {
1375         struct fb_info *info = file_fb_info(file);
1376         struct fb_ops *fb;
1377         unsigned long mmio_pgoff;
1378         unsigned long start;
1379         u32 len;
1380
1381         if (!info)
1382                 return -ENODEV;
1383         fb = info->fbops;
1384         if (!fb)
1385                 return -ENODEV;
1386         mutex_lock(&info->mm_lock);
1387         if (fb->fb_mmap) {
1388                 int res;
1389
1390                 /*
1391                  * The framebuffer needs to be accessed decrypted, be sure
1392                  * SME protection is removed ahead of the call
1393                  */
1394                 vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
1395                 res = fb->fb_mmap(info, vma);
1396                 mutex_unlock(&info->mm_lock);
1397                 return res;
1398         }
1399
1400         /*
1401          * Ugh. This can be either the frame buffer mapping, or
1402          * if pgoff points past it, the mmio mapping.
1403          */
1404         start = info->fix.smem_start;
1405         len = info->fix.smem_len;
1406         mmio_pgoff = PAGE_ALIGN((start & ~PAGE_MASK) + len) >> PAGE_SHIFT;
1407         if (vma->vm_pgoff >= mmio_pgoff) {
1408                 if (info->var.accel_flags) {
1409                         mutex_unlock(&info->mm_lock);
1410                         return -EINVAL;
1411                 }
1412
1413                 vma->vm_pgoff -= mmio_pgoff;
1414                 start = info->fix.mmio_start;
1415                 len = info->fix.mmio_len;
1416         }
1417         mutex_unlock(&info->mm_lock);
1418
1419         vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
1420         /*
1421          * The framebuffer needs to be accessed decrypted, be sure
1422          * SME protection is removed
1423          */
1424         vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
1425         fb_pgprotect(file, vma, start);
1426
1427         return vm_iomap_memory(vma, start, len);
1428 }
1429
1430 static int
1431 fb_open(struct inode *inode, struct file *file)
1432 __acquires(&info->lock)
1433 __releases(&info->lock)
1434 {
1435         int fbidx = iminor(inode);
1436         struct fb_info *info;
1437         int res = 0;
1438
1439         info = get_fb_info(fbidx);
1440         if (!info) {
1441                 request_module("fb%d", fbidx);
1442                 info = get_fb_info(fbidx);
1443                 if (!info)
1444                         return -ENODEV;
1445         }
1446         if (IS_ERR(info))
1447                 return PTR_ERR(info);
1448
1449         mutex_lock(&info->lock);
1450         if (!try_module_get(info->fbops->owner)) {
1451                 res = -ENODEV;
1452                 goto out;
1453         }
1454         file->private_data = info;
1455         if (info->fbops->fb_open) {
1456                 res = info->fbops->fb_open(info,1);
1457                 if (res)
1458                         module_put(info->fbops->owner);
1459         }
1460 #ifdef CONFIG_FB_DEFERRED_IO
1461         if (info->fbdefio)
1462                 fb_deferred_io_open(info, inode, file);
1463 #endif
1464 out:
1465         mutex_unlock(&info->lock);
1466         if (res)
1467                 put_fb_info(info);
1468         return res;
1469 }
1470
1471 static int
1472 fb_release(struct inode *inode, struct file *file)
1473 __acquires(&info->lock)
1474 __releases(&info->lock)
1475 {
1476         struct fb_info * const info = file->private_data;
1477
1478         mutex_lock(&info->lock);
1479         if (info->fbops->fb_release)
1480                 info->fbops->fb_release(info,1);
1481         module_put(info->fbops->owner);
1482         mutex_unlock(&info->lock);
1483         put_fb_info(info);
1484         return 0;
1485 }
1486
1487 #if defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && !defined(CONFIG_MMU)
1488 unsigned long get_fb_unmapped_area(struct file *filp,
1489                                    unsigned long addr, unsigned long len,
1490                                    unsigned long pgoff, unsigned long flags)
1491 {
1492         struct fb_info * const info = filp->private_data;
1493         unsigned long fb_size = PAGE_ALIGN(info->fix.smem_len);
1494
1495         if (pgoff > fb_size || len > fb_size - pgoff)
1496                 return -EINVAL;
1497
1498         return (unsigned long)info->screen_base + pgoff;
1499 }
1500 #endif
1501
1502 static const struct file_operations fb_fops = {
1503         .owner =        THIS_MODULE,
1504         .read =         fb_read,
1505         .write =        fb_write,
1506         .unlocked_ioctl = fb_ioctl,
1507 #ifdef CONFIG_COMPAT
1508         .compat_ioctl = fb_compat_ioctl,
1509 #endif
1510         .mmap =         fb_mmap,
1511         .open =         fb_open,
1512         .release =      fb_release,
1513 #if defined(HAVE_ARCH_FB_UNMAPPED_AREA) || \
1514         (defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && \
1515          !defined(CONFIG_MMU))
1516         .get_unmapped_area = get_fb_unmapped_area,
1517 #endif
1518 #ifdef CONFIG_FB_DEFERRED_IO
1519         .fsync =        fb_deferred_io_fsync,
1520 #endif
1521         .llseek =       default_llseek,
1522 };
1523
1524 struct class *fb_class;
1525 EXPORT_SYMBOL(fb_class);
1526
1527 static int fb_check_foreignness(struct fb_info *fi)
1528 {
1529         const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN;
1530
1531         fi->flags &= ~FBINFO_FOREIGN_ENDIAN;
1532
1533 #ifdef __BIG_ENDIAN
1534         fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH;
1535 #else
1536         fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0;
1537 #endif /* __BIG_ENDIAN */
1538
1539         if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) {
1540                 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to "
1541                        "support this framebuffer\n", fi->fix.id);
1542                 return -ENOSYS;
1543         } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) {
1544                 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to "
1545                        "support this framebuffer\n", fi->fix.id);
1546                 return -ENOSYS;
1547         }
1548
1549         return 0;
1550 }
1551
1552 static bool apertures_overlap(struct aperture *gen, struct aperture *hw)
1553 {
1554         /* is the generic aperture base the same as the HW one */
1555         if (gen->base == hw->base)
1556                 return true;
1557         /* is the generic aperture base inside the hw base->hw base+size */
1558         if (gen->base > hw->base && gen->base < hw->base + hw->size)
1559                 return true;
1560         return false;
1561 }
1562
1563 static bool fb_do_apertures_overlap(struct apertures_struct *gena,
1564                                     struct apertures_struct *hwa)
1565 {
1566         int i, j;
1567         if (!hwa || !gena)
1568                 return false;
1569
1570         for (i = 0; i < hwa->count; ++i) {
1571                 struct aperture *h = &hwa->ranges[i];
1572                 for (j = 0; j < gena->count; ++j) {
1573                         struct aperture *g = &gena->ranges[j];
1574                         printk(KERN_DEBUG "checking generic (%llx %llx) vs hw (%llx %llx)\n",
1575                                 (unsigned long long)g->base,
1576                                 (unsigned long long)g->size,
1577                                 (unsigned long long)h->base,
1578                                 (unsigned long long)h->size);
1579                         if (apertures_overlap(g, h))
1580                                 return true;
1581                 }
1582         }
1583
1584         return false;
1585 }
1586
1587 static int do_unregister_framebuffer(struct fb_info *fb_info);
1588
1589 #define VGA_FB_PHYS 0xA0000
1590 static int do_remove_conflicting_framebuffers(struct apertures_struct *a,
1591                                               const char *name, bool primary)
1592 {
1593         int i, ret;
1594
1595         /* check all firmware fbs and kick off if the base addr overlaps */
1596         for (i = 0 ; i < FB_MAX; i++) {
1597                 struct apertures_struct *gen_aper;
1598                 if (!registered_fb[i])
1599                         continue;
1600
1601                 if (!(registered_fb[i]->flags & FBINFO_MISC_FIRMWARE))
1602                         continue;
1603
1604                 gen_aper = registered_fb[i]->apertures;
1605                 if (fb_do_apertures_overlap(gen_aper, a) ||
1606                         (primary && gen_aper && gen_aper->count &&
1607                          gen_aper->ranges[0].base == VGA_FB_PHYS)) {
1608
1609                         printk(KERN_INFO "fb: switching to %s from %s\n",
1610                                name, registered_fb[i]->fix.id);
1611                         ret = do_unregister_framebuffer(registered_fb[i]);
1612                         if (ret)
1613                                 return ret;
1614                 }
1615         }
1616
1617         return 0;
1618 }
1619
1620 static bool lockless_register_fb;
1621 module_param_named_unsafe(lockless_register_fb, lockless_register_fb, bool, 0400);
1622 MODULE_PARM_DESC(lockless_register_fb,
1623         "Lockless framebuffer registration for debugging [default=off]");
1624
1625 static int do_register_framebuffer(struct fb_info *fb_info)
1626 {
1627         int i, ret;
1628         struct fb_event event;
1629         struct fb_videomode mode;
1630
1631         if (fb_check_foreignness(fb_info))
1632                 return -ENOSYS;
1633
1634         ret = do_remove_conflicting_framebuffers(fb_info->apertures,
1635                                                  fb_info->fix.id,
1636                                                  fb_is_primary_device(fb_info));
1637         if (ret)
1638                 return ret;
1639
1640         if (num_registered_fb == FB_MAX)
1641                 return -ENXIO;
1642
1643         num_registered_fb++;
1644         for (i = 0 ; i < FB_MAX; i++)
1645                 if (!registered_fb[i])
1646                         break;
1647         fb_info->node = i;
1648         atomic_set(&fb_info->count, 1);
1649         mutex_init(&fb_info->lock);
1650         mutex_init(&fb_info->mm_lock);
1651
1652         fb_info->dev = device_create(fb_class, fb_info->device,
1653                                      MKDEV(FB_MAJOR, i), NULL, "fb%d", i);
1654         if (IS_ERR(fb_info->dev)) {
1655                 /* Not fatal */
1656                 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1657                 fb_info->dev = NULL;
1658         } else
1659                 fb_init_device(fb_info);
1660
1661         if (fb_info->pixmap.addr == NULL) {
1662                 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1663                 if (fb_info->pixmap.addr) {
1664                         fb_info->pixmap.size = FBPIXMAPSIZE;
1665                         fb_info->pixmap.buf_align = 1;
1666                         fb_info->pixmap.scan_align = 1;
1667                         fb_info->pixmap.access_align = 32;
1668                         fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1669                 }
1670         }
1671         fb_info->pixmap.offset = 0;
1672
1673         if (!fb_info->pixmap.blit_x)
1674                 fb_info->pixmap.blit_x = ~(u32)0;
1675
1676         if (!fb_info->pixmap.blit_y)
1677                 fb_info->pixmap.blit_y = ~(u32)0;
1678
1679         if (!fb_info->modelist.prev || !fb_info->modelist.next)
1680                 INIT_LIST_HEAD(&fb_info->modelist);
1681
1682         if (fb_info->skip_vt_switch)
1683                 pm_vt_switch_required(fb_info->dev, false);
1684         else
1685                 pm_vt_switch_required(fb_info->dev, true);
1686
1687         fb_var_to_videomode(&mode, &fb_info->var);
1688         fb_add_videomode(&mode, &fb_info->modelist);
1689         registered_fb[i] = fb_info;
1690
1691         event.info = fb_info;
1692         if (!lockless_register_fb)
1693                 console_lock();
1694         if (!lock_fb_info(fb_info)) {
1695                 if (!lockless_register_fb)
1696                         console_unlock();
1697                 return -ENODEV;
1698         }
1699
1700         fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1701         unlock_fb_info(fb_info);
1702         if (!lockless_register_fb)
1703                 console_unlock();
1704         return 0;
1705 }
1706
1707 static int do_unregister_framebuffer(struct fb_info *fb_info)
1708 {
1709         struct fb_event event;
1710         int i, ret = 0;
1711
1712         i = fb_info->node;
1713         if (i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)
1714                 return -EINVAL;
1715
1716         console_lock();
1717         if (!lock_fb_info(fb_info)) {
1718                 console_unlock();
1719                 return -ENODEV;
1720         }
1721
1722         event.info = fb_info;
1723         ret = fb_notifier_call_chain(FB_EVENT_FB_UNBIND, &event);
1724         unlock_fb_info(fb_info);
1725         console_unlock();
1726
1727         if (ret)
1728                 return -EINVAL;
1729
1730         pm_vt_switch_unregister(fb_info->dev);
1731
1732         unlink_framebuffer(fb_info);
1733         if (fb_info->pixmap.addr &&
1734             (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1735                 kfree(fb_info->pixmap.addr);
1736         fb_destroy_modelist(&fb_info->modelist);
1737         registered_fb[i] = NULL;
1738         num_registered_fb--;
1739         fb_cleanup_device(fb_info);
1740         event.info = fb_info;
1741         console_lock();
1742         fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1743         console_unlock();
1744
1745         /* this may free fb info */
1746         put_fb_info(fb_info);
1747         return 0;
1748 }
1749
1750 int unlink_framebuffer(struct fb_info *fb_info)
1751 {
1752         int i;
1753
1754         i = fb_info->node;
1755         if (i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)
1756                 return -EINVAL;
1757
1758         if (fb_info->dev) {
1759                 device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1760                 fb_info->dev = NULL;
1761         }
1762         return 0;
1763 }
1764 EXPORT_SYMBOL(unlink_framebuffer);
1765
1766 int remove_conflicting_framebuffers(struct apertures_struct *a,
1767                                     const char *name, bool primary)
1768 {
1769         int ret;
1770
1771         mutex_lock(&registration_lock);
1772         ret = do_remove_conflicting_framebuffers(a, name, primary);
1773         mutex_unlock(&registration_lock);
1774
1775         return ret;
1776 }
1777 EXPORT_SYMBOL(remove_conflicting_framebuffers);
1778
1779 /**
1780  *      register_framebuffer - registers a frame buffer device
1781  *      @fb_info: frame buffer info structure
1782  *
1783  *      Registers a frame buffer device @fb_info.
1784  *
1785  *      Returns negative errno on error, or zero for success.
1786  *
1787  */
1788 int
1789 register_framebuffer(struct fb_info *fb_info)
1790 {
1791         int ret;
1792
1793         mutex_lock(&registration_lock);
1794         ret = do_register_framebuffer(fb_info);
1795         mutex_unlock(&registration_lock);
1796
1797         return ret;
1798 }
1799 EXPORT_SYMBOL(register_framebuffer);
1800
1801 /**
1802  *      unregister_framebuffer - releases a frame buffer device
1803  *      @fb_info: frame buffer info structure
1804  *
1805  *      Unregisters a frame buffer device @fb_info.
1806  *
1807  *      Returns negative errno on error, or zero for success.
1808  *
1809  *      This function will also notify the framebuffer console
1810  *      to release the driver.
1811  *
1812  *      This is meant to be called within a driver's module_exit()
1813  *      function. If this is called outside module_exit(), ensure
1814  *      that the driver implements fb_open() and fb_release() to
1815  *      check that no processes are using the device.
1816  */
1817 int
1818 unregister_framebuffer(struct fb_info *fb_info)
1819 {
1820         int ret;
1821
1822         mutex_lock(&registration_lock);
1823         ret = do_unregister_framebuffer(fb_info);
1824         mutex_unlock(&registration_lock);
1825
1826         return ret;
1827 }
1828 EXPORT_SYMBOL(unregister_framebuffer);
1829
1830 /**
1831  *      fb_set_suspend - low level driver signals suspend
1832  *      @info: framebuffer affected
1833  *      @state: 0 = resuming, !=0 = suspending
1834  *
1835  *      This is meant to be used by low level drivers to
1836  *      signal suspend/resume to the core & clients.
1837  *      It must be called with the console semaphore held
1838  */
1839 void fb_set_suspend(struct fb_info *info, int state)
1840 {
1841         struct fb_event event;
1842
1843         event.info = info;
1844         if (state) {
1845                 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event);
1846                 info->state = FBINFO_STATE_SUSPENDED;
1847         } else {
1848                 info->state = FBINFO_STATE_RUNNING;
1849                 fb_notifier_call_chain(FB_EVENT_RESUME, &event);
1850         }
1851 }
1852 EXPORT_SYMBOL(fb_set_suspend);
1853
1854 /**
1855  *      fbmem_init - init frame buffer subsystem
1856  *
1857  *      Initialize the frame buffer subsystem.
1858  *
1859  *      NOTE: This function is _only_ to be called by drivers/char/mem.c.
1860  *
1861  */
1862
1863 static int __init
1864 fbmem_init(void)
1865 {
1866         int ret;
1867
1868         if (!proc_create_seq("fb", 0, NULL, &proc_fb_seq_ops))
1869                 return -ENOMEM;
1870
1871         ret = register_chrdev(FB_MAJOR, "fb", &fb_fops);
1872         if (ret) {
1873                 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1874                 goto err_chrdev;
1875         }
1876
1877         fb_class = class_create(THIS_MODULE, "graphics");
1878         if (IS_ERR(fb_class)) {
1879                 ret = PTR_ERR(fb_class);
1880                 pr_warn("Unable to create fb class; errno = %d\n", ret);
1881                 fb_class = NULL;
1882                 goto err_class;
1883         }
1884
1885         fb_console_init();
1886
1887         return 0;
1888
1889 err_class:
1890         unregister_chrdev(FB_MAJOR, "fb");
1891 err_chrdev:
1892         remove_proc_entry("fb", NULL);
1893         return ret;
1894 }
1895
1896 #ifdef MODULE
1897 module_init(fbmem_init);
1898 static void __exit
1899 fbmem_exit(void)
1900 {
1901         fb_console_exit();
1902
1903         remove_proc_entry("fb", NULL);
1904         class_destroy(fb_class);
1905         unregister_chrdev(FB_MAJOR, "fb");
1906 }
1907
1908 module_exit(fbmem_exit);
1909 MODULE_LICENSE("GPL");
1910 MODULE_DESCRIPTION("Framebuffer base");
1911 #else
1912 subsys_initcall(fbmem_init);
1913 #endif
1914
1915 int fb_new_modelist(struct fb_info *info)
1916 {
1917         struct fb_event event;
1918         struct fb_var_screeninfo var = info->var;
1919         struct list_head *pos, *n;
1920         struct fb_modelist *modelist;
1921         struct fb_videomode *m, mode;
1922         int err = 1;
1923
1924         list_for_each_safe(pos, n, &info->modelist) {
1925                 modelist = list_entry(pos, struct fb_modelist, list);
1926                 m = &modelist->mode;
1927                 fb_videomode_to_var(&var, m);
1928                 var.activate = FB_ACTIVATE_TEST;
1929                 err = fb_set_var(info, &var);
1930                 fb_var_to_videomode(&mode, &var);
1931                 if (err || !fb_mode_is_equal(m, &mode)) {
1932                         list_del(pos);
1933                         kfree(pos);
1934                 }
1935         }
1936
1937         err = 1;
1938
1939         if (!list_empty(&info->modelist)) {
1940                 event.info = info;
1941                 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
1942         }
1943
1944         return err;
1945 }
1946
1947 MODULE_LICENSE("GPL");