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 <brad@neruo.com>
   8  *
   9  * This file is subject to the terms and conditions of the GNU General Public
  10  * License.  See the file COPYING in the main directory of this archive
  11  * for more details.
  12  */
  13
  14 #include <linux/module.h>
  15
  16 #include <linux/compat.h>
  17 #include <linux/types.h>
  18 #include <linux/errno.h>
  19 #include <linux/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/platform_device.h>
  29 #include <linux/seq_file.h>
  30 #include <linux/console.h>
  31 #include <linux/kmod.h>
  32 #include <linux/err.h>
  33 #include <linux/device.h>
  34 #include <linux/efi.h>
  35 #include <linux/fb.h>
  36 #include <linux/fbcon.h>
  37 #include <linux/mem_encrypt.h>
  38 #include <linux/pci.h>
  39
  40 #include <asm/fb.h>
  41
  42 #include <video/nomodeset.h>
  43 #include <video/vga.h>
  44
  45     /*
  46      *  Frame buffer device initialization and setup routines
  47      */
  48
  49 #define FBPIXMAPSIZE    (1024 * 8)
  50
  51 static DEFINE_MUTEX(registration_lock);
  52
  53 struct fb_info *registered_fb[FB_MAX] __read_mostly;
  54 int num_registered_fb __read_mostly;
  55 #define for_each_registered_fb(i)               \
  56         for (i = 0; i < FB_MAX; i++)            \
  57                 if (!registered_fb[i]) {} else
  58
  59 bool fb_center_logo __read_mostly;
  60
  61 int fb_logo_count __read_mostly = -1;
  62
  63 static struct fb_info *get_fb_info(unsigned int idx)
  64 {
  65         struct fb_info *fb_info;
  66
  67         if (idx >= FB_MAX)
  68                 return ERR_PTR(-ENODEV);
  69
  70         mutex_lock(&registration_lock);
  71         fb_info = registered_fb[idx];
  72         if (fb_info)
  73                 refcount_inc(&fb_info->count);
  74         mutex_unlock(&registration_lock);
  75
  76         return fb_info;
  77 }
  78
  79 static void put_fb_info(struct fb_info *fb_info)
  80 {
  81         if (!refcount_dec_and_test(&fb_info->count))
  82                 return;
  83         if (fb_info->fbops->fb_destroy)
  84                 fb_info->fbops->fb_destroy(fb_info);
  85 }
  86
  87 /*
  88  * Helpers
  89  */
  90
  91 int fb_get_color_depth(struct fb_var_screeninfo *var,
  92                        struct fb_fix_screeninfo *fix)
  93 {
  94         int depth = 0;
  95
  96         if (fix->visual == FB_VISUAL_MONO01 ||
  97             fix->visual == FB_VISUAL_MONO10)
  98                 depth = 1;
  99         else {
 100                 if (var->green.length == var->blue.length &&
 101                     var->green.length == var->red.length &&
 102                     var->green.offset == var->blue.offset &&
 103                     var->green.offset == var->red.offset)
 104                         depth = var->green.length;
 105                 else
 106                         depth = var->green.length + var->red.length +
 107                                 var->blue.length;
 108         }
 109
 110         return depth;
 111 }
 112 EXPORT_SYMBOL(fb_get_color_depth);
 113
 114 /*
 115  * Data padding functions.
 116  */
 117 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
 118 {
 119         __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
 120 }
 121 EXPORT_SYMBOL(fb_pad_aligned_buffer);
 122
 123 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
 124                                 u32 shift_high, u32 shift_low, u32 mod)
 125 {
 126         u8 mask = (u8) (0xfff << shift_high), tmp;
 127         int i, j;
 128
 129         for (i = height; i--; ) {
 130                 for (j = 0; j < idx; j++) {
 131                         tmp = dst[j];
 132                         tmp &= mask;
 133                         tmp |= *src >> shift_low;
 134                         dst[j] = tmp;
 135                         tmp = *src << shift_high;
 136                         dst[j+1] = tmp;
 137                         src++;
 138                 }
 139                 tmp = dst[idx];
 140                 tmp &= mask;
 141                 tmp |= *src >> shift_low;
 142                 dst[idx] = tmp;
 143                 if (shift_high < mod) {
 144                         tmp = *src << shift_high;
 145                         dst[idx+1] = tmp;
 146                 }
 147                 src++;
 148                 dst += d_pitch;
 149         }
 150 }
 151 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
 152
 153 /*
 154  * we need to lock this section since fb_cursor
 155  * may use fb_imageblit()
 156  */
 157 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
 158 {
 159         u32 align = buf->buf_align - 1, offset;
 160         char *addr = buf->addr;
 161
 162         /* If IO mapped, we need to sync before access, no sharing of
 163          * the pixmap is done
 164          */
 165         if (buf->flags & FB_PIXMAP_IO) {
 166                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 167                         info->fbops->fb_sync(info);
 168                 return addr;
 169         }
 170
 171         /* See if we fit in the remaining pixmap space */
 172         offset = buf->offset + align;
 173         offset &= ~align;
 174         if (offset + size > buf->size) {
 175                 /* We do not fit. In order to be able to re-use the buffer,
 176                  * we must ensure no asynchronous DMA'ing or whatever operation
 177                  * is in progress, we sync for that.
 178                  */
 179                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 180                         info->fbops->fb_sync(info);
 181                 offset = 0;
 182         }
 183         buf->offset = offset + size;
 184         addr += offset;
 185
 186         return addr;
 187 }
 188 EXPORT_SYMBOL(fb_get_buffer_offset);
 189
 190 #ifdef CONFIG_LOGO
 191
 192 static inline unsigned safe_shift(unsigned d, int n)
 193 {
 194         return n < 0 ? d >> -n : d << n;
 195 }
 196
 197 static void fb_set_logocmap(struct fb_info *info,
 198                                    const struct linux_logo *logo)
 199 {
 200         struct fb_cmap palette_cmap;
 201         u16 palette_green[16];
 202         u16 palette_blue[16];
 203         u16 palette_red[16];
 204         int i, j, n;
 205         const unsigned char *clut = logo->clut;
 206
 207         palette_cmap.start = 0;
 208         palette_cmap.len = 16;
 209         palette_cmap.red = palette_red;
 210         palette_cmap.green = palette_green;
 211         palette_cmap.blue = palette_blue;
 212         palette_cmap.transp = NULL;
 213
 214         for (i = 0; i < logo->clutsize; i += n) {
 215                 n = logo->clutsize - i;
 216                 /* palette_cmap provides space for only 16 colors at once */
 217                 if (n > 16)
 218                         n = 16;
 219                 palette_cmap.start = 32 + i;
 220                 palette_cmap.len = n;
 221                 for (j = 0; j < n; ++j) {
 222                         palette_cmap.red[j] = clut[0] << 8 | clut[0];
 223                         palette_cmap.green[j] = clut[1] << 8 | clut[1];
 224                         palette_cmap.blue[j] = clut[2] << 8 | clut[2];
 225                         clut += 3;
 226                 }
 227                 fb_set_cmap(&palette_cmap, info);
 228         }
 229 }
 230
 231 static void  fb_set_logo_truepalette(struct fb_info *info,
 232                                             const struct linux_logo *logo,
 233                                             u32 *palette)
 234 {
 235         static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
 236         unsigned char redmask, greenmask, bluemask;
 237         int redshift, greenshift, blueshift;
 238         int i;
 239         const unsigned char *clut = logo->clut;
 240
 241         /*
 242          * We have to create a temporary palette since console palette is only
 243          * 16 colors long.
 244          */
 245         /* Bug: Doesn't obey msb_right ... (who needs that?) */
 246         redmask   = mask[info->var.red.length   < 8 ? info->var.red.length   : 8];
 247         greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
 248         bluemask  = mask[info->var.blue.length  < 8 ? info->var.blue.length  : 8];
 249         redshift   = info->var.red.offset   - (8 - info->var.red.length);
 250         greenshift = info->var.green.offset - (8 - info->var.green.length);
 251         blueshift  = info->var.blue.offset  - (8 - info->var.blue.length);
 252
 253         for ( i = 0; i < logo->clutsize; i++) {
 254                 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
 255                                  safe_shift((clut[1] & greenmask), greenshift) |
 256                                  safe_shift((clut[2] & bluemask), blueshift));
 257                 clut += 3;
 258         }
 259 }
 260
 261 static void fb_set_logo_directpalette(struct fb_info *info,
 262                                              const struct linux_logo *logo,
 263                                              u32 *palette)
 264 {
 265         int redshift, greenshift, blueshift;
 266         int i;
 267
 268         redshift = info->var.red.offset;
 269         greenshift = info->var.green.offset;
 270         blueshift = info->var.blue.offset;
 271
 272         for (i = 32; i < 32 + logo->clutsize; i++)
 273                 palette[i] = i << redshift | i << greenshift | i << blueshift;
 274 }
 275
 276 static void fb_set_logo(struct fb_info *info,
 277                                const struct linux_logo *logo, u8 *dst,
 278                                int depth)
 279 {
 280         int i, j, k;
 281         const u8 *src = logo->data;
 282         u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
 283         u8 fg = 1, d;
 284
 285         switch (fb_get_color_depth(&info->var, &info->fix)) {
 286         case 1:
 287                 fg = 1;
 288                 break;
 289         case 2:
 290                 fg = 3;
 291                 break;
 292         default:
 293                 fg = 7;
 294                 break;
 295         }
 296
 297         if (info->fix.visual == FB_VISUAL_MONO01 ||
 298             info->fix.visual == FB_VISUAL_MONO10)
 299                 fg = ~((u8) (0xfff << info->var.green.length));
 300
 301         switch (depth) {
 302         case 4:
 303                 for (i = 0; i < logo->height; i++)
 304                         for (j = 0; j < logo->width; src++) {
 305                                 *dst++ = *src >> 4;
 306                                 j++;
 307                                 if (j < logo->width) {
 308                                         *dst++ = *src & 0x0f;
 309                                         j++;
 310                                 }
 311                         }
 312                 break;
 313         case 1:
 314                 for (i = 0; i < logo->height; i++) {
 315                         for (j = 0; j < logo->width; src++) {
 316                                 d = *src ^ xor;
 317                                 for (k = 7; k >= 0 && j < logo->width; k--) {
 318                                         *dst++ = ((d >> k) & 1) ? fg : 0;
 319                                         j++;
 320                                 }
 321                         }
 322                 }
 323                 break;
 324         }
 325 }
 326
 327 /*
 328  * Three (3) kinds of logo maps exist.  linux_logo_clut224 (>16 colors),
 329  * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors).  Depending on
 330  * the visual format and color depth of the framebuffer, the DAC, the
 331  * pseudo_palette, and the logo data will be adjusted accordingly.
 332  *
 333  * Case 1 - linux_logo_clut224:
 334  * Color exceeds the number of console colors (16), thus we set the hardware DAC
 335  * using fb_set_cmap() appropriately.  The "needs_cmapreset"  flag will be set.
 336  *
 337  * For visuals that require color info from the pseudo_palette, we also construct
 338  * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
 339  * will be set.
 340  *
 341  * Case 2 - linux_logo_vga16:
 342  * The number of colors just matches the console colors, thus there is no need
 343  * to set the DAC or the pseudo_palette.  However, the bitmap is packed, ie,
 344  * each byte contains color information for two pixels (upper and lower nibble).
 345  * To be consistent with fb_imageblit() usage, we therefore separate the two
 346  * nibbles into separate bytes. The "depth" flag will be set to 4.
 347  *
 348  * Case 3 - linux_logo_mono:
 349  * This is similar with Case 2.  Each byte contains information for 8 pixels.
 350  * We isolate each bit and expand each into a byte. The "depth" flag will
 351  * be set to 1.
 352  */
 353 static struct logo_data {
 354         int depth;
 355         int needs_directpalette;
 356         int needs_truepalette;
 357         int needs_cmapreset;
 358         const struct linux_logo *logo;
 359 } fb_logo __read_mostly;
 360
 361 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
 362 {
 363         u32 size = width * height, i;
 364
 365         out += size - 1;
 366
 367         for (i = size; i--; )
 368                 *out-- = *in++;
 369 }
 370
 371 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
 372 {
 373         int i, j, h = height - 1;
 374
 375         for (i = 0; i < height; i++)
 376                 for (j = 0; j < width; j++)
 377                                 out[height * j + h - i] = *in++;
 378 }
 379
 380 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
 381 {
 382         int i, j, w = width - 1;
 383
 384         for (i = 0; i < height; i++)
 385                 for (j = 0; j < width; j++)
 386                         out[height * (w - j) + i] = *in++;
 387 }
 388
 389 static void fb_rotate_logo(struct fb_info *info, u8 *dst,
 390                            struct fb_image *image, int rotate)
 391 {
 392         u32 tmp;
 393
 394         if (rotate == FB_ROTATE_UD) {
 395                 fb_rotate_logo_ud(image->data, dst, image->width,
 396                                   image->height);
 397                 image->dx = info->var.xres - image->width - image->dx;
 398                 image->dy = info->var.yres - image->height - image->dy;
 399         } else if (rotate == FB_ROTATE_CW) {
 400                 fb_rotate_logo_cw(image->data, dst, image->width,
 401                                   image->height);
 402                 swap(image->width, image->height);
 403                 tmp = image->dy;
 404                 image->dy = image->dx;
 405                 image->dx = info->var.xres - image->width - tmp;
 406         } else if (rotate == FB_ROTATE_CCW) {
 407                 fb_rotate_logo_ccw(image->data, dst, image->width,
 408                                    image->height);
 409                 swap(image->width, image->height);
 410                 tmp = image->dx;
 411                 image->dx = image->dy;
 412                 image->dy = info->var.yres - image->height - tmp;
 413         }
 414
 415         image->data = dst;
 416 }
 417
 418 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
 419                             int rotate, unsigned int num)
 420 {
 421         unsigned int x;
 422
 423         if (image->width > info->var.xres || image->height > info->var.yres)
 424                 return;
 425
 426         if (rotate == FB_ROTATE_UR) {
 427                 for (x = 0;
 428                      x < num && image->dx + image->width <= info->var.xres;
 429                      x++) {
 430                         info->fbops->fb_imageblit(info, image);
 431                         image->dx += image->width + 8;
 432                 }
 433         } else if (rotate == FB_ROTATE_UD) {
 434                 u32 dx = image->dx;
 435
 436                 for (x = 0; x < num && image->dx <= dx; 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                 u32 dy = image->dy;
 449
 450                 for (x = 0; x < num && image->dy <= dy; 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         if (fb_center_logo) {
 505                 int xres = info->var.xres;
 506                 int yres = info->var.yres;
 507
 508                 if (rotate == FB_ROTATE_CW || rotate == FB_ROTATE_CCW) {
 509                         xres = info->var.yres;
 510                         yres = info->var.xres;
 511                 }
 512
 513                 while (n && (n * (logo->width + 8) - 8 > xres))
 514                         --n;
 515                 image.dx = (xres - (n * (logo->width + 8) - 8)) / 2;
 516                 image.dy = y ?: (yres - logo->height) / 2;
 517         } else {
 518                 image.dx = 0;
 519                 image.dy = y;
 520         }
 521
 522         image.width = logo->width;
 523         image.height = logo->height;
 524
 525         if (rotate) {
 526                 logo_rotate = kmalloc_array(logo->width, logo->height,
 527                                             GFP_KERNEL);
 528                 if (logo_rotate)
 529                         fb_rotate_logo(info, logo_rotate, &image, rotate);
 530         }
 531
 532         fb_do_show_logo(info, &image, rotate, n);
 533
 534         kfree(palette);
 535         if (saved_pseudo_palette != NULL)
 536                 info->pseudo_palette = saved_pseudo_palette;
 537         kfree(logo_new);
 538         kfree(logo_rotate);
 539         return image.dy + logo->height;
 540 }
 541
 542
 543 #ifdef CONFIG_FB_LOGO_EXTRA
 544
 545 #define FB_LOGO_EX_NUM_MAX 10
 546 static struct logo_data_extra {
 547         const struct linux_logo *logo;
 548         unsigned int n;
 549 } fb_logo_ex[FB_LOGO_EX_NUM_MAX];
 550 static unsigned int fb_logo_ex_num;
 551
 552 void fb_append_extra_logo(const struct linux_logo *logo, unsigned int n)
 553 {
 554         if (!n || fb_logo_ex_num == FB_LOGO_EX_NUM_MAX)
 555                 return;
 556
 557         fb_logo_ex[fb_logo_ex_num].logo = logo;
 558         fb_logo_ex[fb_logo_ex_num].n = n;
 559         fb_logo_ex_num++;
 560 }
 561
 562 static int fb_prepare_extra_logos(struct fb_info *info, unsigned int height,
 563                                   unsigned int yres)
 564 {
 565         unsigned int i;
 566
 567         /* FIXME: logo_ex supports only truecolor fb. */
 568         if (info->fix.visual != FB_VISUAL_TRUECOLOR)
 569                 fb_logo_ex_num = 0;
 570
 571         for (i = 0; i < fb_logo_ex_num; i++) {
 572                 if (fb_logo_ex[i].logo->type != fb_logo.logo->type) {
 573                         fb_logo_ex[i].logo = NULL;
 574                         continue;
 575                 }
 576                 height += fb_logo_ex[i].logo->height;
 577                 if (height > yres) {
 578                         height -= fb_logo_ex[i].logo->height;
 579                         fb_logo_ex_num = i;
 580                         break;
 581                 }
 582         }
 583         return height;
 584 }
 585
 586 static int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
 587 {
 588         unsigned int i;
 589
 590         for (i = 0; i < fb_logo_ex_num; i++)
 591                 y = fb_show_logo_line(info, rotate,
 592                                       fb_logo_ex[i].logo, y, fb_logo_ex[i].n);
 593
 594         return y;
 595 }
 596
 597 #else /* !CONFIG_FB_LOGO_EXTRA */
 598
 599 static inline int fb_prepare_extra_logos(struct fb_info *info,
 600                                          unsigned int height,
 601                                          unsigned int yres)
 602 {
 603         return height;
 604 }
 605
 606 static inline int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
 607 {
 608         return y;
 609 }
 610
 611 #endif /* CONFIG_FB_LOGO_EXTRA */
 612
 613
 614 int fb_prepare_logo(struct fb_info *info, int rotate)
 615 {
 616         int depth = fb_get_color_depth(&info->var, &info->fix);
 617         unsigned int yres;
 618         int height;
 619
 620         memset(&fb_logo, 0, sizeof(struct logo_data));
 621
 622         if (info->flags & FBINFO_MISC_TILEBLITTING ||
 623             info->fbops->owner || !fb_logo_count)
 624                 return 0;
 625
 626         if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
 627                 depth = info->var.blue.length;
 628                 if (info->var.red.length < depth)
 629                         depth = info->var.red.length;
 630                 if (info->var.green.length < depth)
 631                         depth = info->var.green.length;
 632         }
 633
 634         if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) {
 635                 /* assume console colormap */
 636                 depth = 4;
 637         }
 638
 639         /* Return if no suitable logo was found */
 640         fb_logo.logo = fb_find_logo(depth);
 641
 642         if (!fb_logo.logo) {
 643                 return 0;
 644         }
 645
 646         if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
 647                 yres = info->var.yres;
 648         else
 649                 yres = info->var.xres;
 650
 651         if (fb_logo.logo->height > yres) {
 652                 fb_logo.logo = NULL;
 653                 return 0;
 654         }
 655
 656         /* What depth we asked for might be different from what we get */
 657         if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
 658                 fb_logo.depth = 8;
 659         else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
 660                 fb_logo.depth = 4;
 661         else
 662                 fb_logo.depth = 1;
 663
 664
 665         if (fb_logo.depth > 4 && depth > 4) {
 666                 switch (info->fix.visual) {
 667                 case FB_VISUAL_TRUECOLOR:
 668                         fb_logo.needs_truepalette = 1;
 669                         break;
 670                 case FB_VISUAL_DIRECTCOLOR:
 671                         fb_logo.needs_directpalette = 1;
 672                         fb_logo.needs_cmapreset = 1;
 673                         break;
 674                 case FB_VISUAL_PSEUDOCOLOR:
 675                         fb_logo.needs_cmapreset = 1;
 676                         break;
 677                 }
 678         }
 679
 680         height = fb_logo.logo->height;
 681         if (fb_center_logo)
 682                 height += (yres - fb_logo.logo->height) / 2;
 683
 684         return fb_prepare_extra_logos(info, height, yres);
 685 }
 686
 687 int fb_show_logo(struct fb_info *info, int rotate)
 688 {
 689         unsigned int count;
 690         int y;
 691
 692         if (!fb_logo_count)
 693                 return 0;
 694
 695         count = fb_logo_count < 0 ? num_online_cpus() : fb_logo_count;
 696         y = fb_show_logo_line(info, rotate, fb_logo.logo, 0, count);
 697         y = fb_show_extra_logos(info, y, rotate);
 698
 699         return y;
 700 }
 701 #else
 702 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
 703 int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
 704 #endif /* CONFIG_LOGO */
 705 EXPORT_SYMBOL(fb_prepare_logo);
 706 EXPORT_SYMBOL(fb_show_logo);
 707
 708 static void *fb_seq_start(struct seq_file *m, loff_t *pos)
 709 {
 710         mutex_lock(&registration_lock);
 711         return (*pos < FB_MAX) ? pos : NULL;
 712 }
 713
 714 static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos)
 715 {
 716         (*pos)++;
 717         return (*pos < FB_MAX) ? pos : NULL;
 718 }
 719
 720 static void fb_seq_stop(struct seq_file *m, void *v)
 721 {
 722         mutex_unlock(&registration_lock);
 723 }
 724
 725 static int fb_seq_show(struct seq_file *m, void *v)
 726 {
 727         int i = *(loff_t *)v;
 728         struct fb_info *fi = registered_fb[i];
 729
 730         if (fi)
 731                 seq_printf(m, "%d %s\n", fi->node, fi->fix.id);
 732         return 0;
 733 }
 734
 735 static const struct seq_operations __maybe_unused proc_fb_seq_ops = {
 736         .start  = fb_seq_start,
 737         .next   = fb_seq_next,
 738         .stop   = fb_seq_stop,
 739         .show   = fb_seq_show,
 740 };
 741
 742 /*
 743  * We hold a reference to the fb_info in file->private_data,
 744  * but if the current registered fb has changed, we don't
 745  * actually want to use it.
 746  *
 747  * So look up the fb_info using the inode minor number,
 748  * and just verify it against the reference we have.
 749  */
 750 static struct fb_info *file_fb_info(struct file *file)
 751 {
 752         struct inode *inode = file_inode(file);
 753         int fbidx = iminor(inode);
 754         struct fb_info *info = registered_fb[fbidx];
 755
 756         if (info != file->private_data)
 757                 info = NULL;
 758         return info;
 759 }
 760
 761 static ssize_t
 762 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 763 {
 764         unsigned long p = *ppos;
 765         struct fb_info *info = file_fb_info(file);
 766         u8 *buffer, *dst;
 767         u8 __iomem *src;
 768         int c, cnt = 0, err = 0;
 769         unsigned long total_size;
 770
 771         if (!info || ! info->screen_base)
 772                 return -ENODEV;
 773
 774         if (info->state != FBINFO_STATE_RUNNING)
 775                 return -EPERM;
 776
 777         if (info->fbops->fb_read)
 778                 return info->fbops->fb_read(info, buf, count, ppos);
 779
 780         total_size = info->screen_size;
 781
 782         if (total_size == 0)
 783                 total_size = info->fix.smem_len;
 784
 785         if (p >= total_size)
 786                 return 0;
 787
 788         if (count >= total_size)
 789                 count = total_size;
 790
 791         if (count + p > total_size)
 792                 count = total_size - p;
 793
 794         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 795                          GFP_KERNEL);
 796         if (!buffer)
 797                 return -ENOMEM;
 798
 799         src = (u8 __iomem *) (info->screen_base + p);
 800
 801         if (info->fbops->fb_sync)
 802                 info->fbops->fb_sync(info);
 803
 804         while (count) {
 805                 c  = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 806                 dst = buffer;
 807                 fb_memcpy_fromfb(dst, src, c);
 808                 dst += c;
 809                 src += c;
 810
 811                 if (copy_to_user(buf, buffer, c)) {
 812                         err = -EFAULT;
 813                         break;
 814                 }
 815                 *ppos += c;
 816                 buf += c;
 817                 cnt += c;
 818                 count -= c;
 819         }
 820
 821         kfree(buffer);
 822
 823         return (err) ? err : cnt;
 824 }
 825
 826 static ssize_t
 827 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 828 {
 829         unsigned long p = *ppos;
 830         struct fb_info *info = file_fb_info(file);
 831         u8 *buffer, *src;
 832         u8 __iomem *dst;
 833         int c, cnt = 0, err = 0;
 834         unsigned long total_size;
 835
 836         if (!info || !info->screen_base)
 837                 return -ENODEV;
 838
 839         if (info->state != FBINFO_STATE_RUNNING)
 840                 return -EPERM;
 841
 842         if (info->fbops->fb_write)
 843                 return info->fbops->fb_write(info, buf, count, ppos);
 844
 845         total_size = info->screen_size;
 846
 847         if (total_size == 0)
 848                 total_size = info->fix.smem_len;
 849
 850         if (p > total_size)
 851                 return -EFBIG;
 852
 853         if (count > total_size) {
 854                 err = -EFBIG;
 855                 count = total_size;
 856         }
 857
 858         if (count + p > total_size) {
 859                 if (!err)
 860                         err = -ENOSPC;
 861
 862                 count = total_size - p;
 863         }
 864
 865         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 866                          GFP_KERNEL);
 867         if (!buffer)
 868                 return -ENOMEM;
 869
 870         dst = (u8 __iomem *) (info->screen_base + p);
 871
 872         if (info->fbops->fb_sync)
 873                 info->fbops->fb_sync(info);
 874
 875         while (count) {
 876                 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 877                 src = buffer;
 878
 879                 if (copy_from_user(src, buf, c)) {
 880                         err = -EFAULT;
 881                         break;
 882                 }
 883
 884                 fb_memcpy_tofb(dst, src, c);
 885                 dst += c;
 886                 src += c;
 887                 *ppos += c;
 888                 buf += c;
 889                 cnt += c;
 890                 count -= c;
 891         }
 892
 893         kfree(buffer);
 894
 895         return (cnt) ? cnt : err;
 896 }
 897
 898 int
 899 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
 900 {
 901         struct fb_fix_screeninfo *fix = &info->fix;
 902         unsigned int yres = info->var.yres;
 903         int err = 0;
 904
 905         if (var->yoffset > 0) {
 906                 if (var->vmode & FB_VMODE_YWRAP) {
 907                         if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
 908                                 err = -EINVAL;
 909                         else
 910                                 yres = 0;
 911                 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
 912                         err = -EINVAL;
 913         }
 914
 915         if (var->xoffset > 0 && (!fix->xpanstep ||
 916                                  (var->xoffset % fix->xpanstep)))
 917                 err = -EINVAL;
 918
 919         if (err || !info->fbops->fb_pan_display ||
 920             var->yoffset > info->var.yres_virtual - yres ||
 921             var->xoffset > info->var.xres_virtual - info->var.xres)
 922                 return -EINVAL;
 923
 924         if ((err = info->fbops->fb_pan_display(var, info)))
 925                 return err;
 926         info->var.xoffset = var->xoffset;
 927         info->var.yoffset = var->yoffset;
 928         if (var->vmode & FB_VMODE_YWRAP)
 929                 info->var.vmode |= FB_VMODE_YWRAP;
 930         else
 931                 info->var.vmode &= ~FB_VMODE_YWRAP;
 932         return 0;
 933 }
 934 EXPORT_SYMBOL(fb_pan_display);
 935
 936 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var,
 937                          u32 activate)
 938 {
 939         struct fb_blit_caps caps, fbcaps;
 940         int err = 0;
 941
 942         memset(&caps, 0, sizeof(caps));
 943         memset(&fbcaps, 0, sizeof(fbcaps));
 944         caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0;
 945         fbcon_get_requirement(info, &caps);
 946         info->fbops->fb_get_caps(info, &fbcaps, var);
 947
 948         if (((fbcaps.x ^ caps.x) & caps.x) ||
 949             ((fbcaps.y ^ caps.y) & caps.y) ||
 950             (fbcaps.len < caps.len))
 951                 err = -EINVAL;
 952
 953         return err;
 954 }
 955
 956 int
 957 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
 958 {
 959         int ret = 0;
 960         u32 activate;
 961         struct fb_var_screeninfo old_var;
 962         struct fb_videomode mode;
 963         struct fb_event event;
 964         u32 unused;
 965
 966         if (var->activate & FB_ACTIVATE_INV_MODE) {
 967                 struct fb_videomode mode1, mode2;
 968
 969                 fb_var_to_videomode(&mode1, var);
 970                 fb_var_to_videomode(&mode2, &info->var);
 971                 /* make sure we don't delete the videomode of current var */
 972                 ret = fb_mode_is_equal(&mode1, &mode2);
 973                 if (!ret) {
 974                         ret = fbcon_mode_deleted(info, &mode1);
 975                         if (!ret)
 976                                 fb_delete_videomode(&mode1, &info->modelist);
 977                 }
 978
 979                 return ret ? -EINVAL : 0;
 980         }
 981
 982         if (!(var->activate & FB_ACTIVATE_FORCE) &&
 983             !memcmp(&info->var, var, sizeof(struct fb_var_screeninfo)))
 984                 return 0;
 985
 986         activate = var->activate;
 987
 988         /* When using FOURCC mode, make sure the red, green, blue and
 989          * transp fields are set to 0.
 990          */
 991         if ((info->fix.capabilities & FB_CAP_FOURCC) &&
 992             var->grayscale > 1) {
 993                 if (var->red.offset     || var->green.offset    ||
 994                     var->blue.offset    || var->transp.offset   ||
 995                     var->red.length     || var->green.length    ||
 996                     var->blue.length    || var->transp.length   ||
 997                     var->red.msb_right  || var->green.msb_right ||
 998                     var->blue.msb_right || var->transp.msb_right)
 999                         return -EINVAL;
1000         }
1001
1002         if (!info->fbops->fb_check_var) {
1003                 *var = info->var;
1004                 return 0;
1005         }
1006
1007         /* bitfill_aligned() assumes that it's at least 8x8 */
1008         if (var->xres < 8 || var->yres < 8)
1009                 return -EINVAL;
1010
1011         /* Too huge resolution causes multiplication overflow. */
1012         if (check_mul_overflow(var->xres, var->yres, &unused) ||
1013             check_mul_overflow(var->xres_virtual, var->yres_virtual, &unused))
1014                 return -EINVAL;
1015
1016         ret = info->fbops->fb_check_var(var, info);
1017
1018         if (ret)
1019                 return ret;
1020
1021         /* verify that virtual resolution >= physical resolution */
1022         if (var->xres_virtual < var->xres ||
1023             var->yres_virtual < var->yres) {
1024                 pr_warn("WARNING: fbcon: Driver '%s' missed to adjust virtual screen size (%ux%u vs. %ux%u)\n",
1025                         info->fix.id,
1026                         var->xres_virtual, var->yres_virtual,
1027                         var->xres, var->yres);
1028                 return -EINVAL;
1029         }
1030
1031         if ((var->activate & FB_ACTIVATE_MASK) != FB_ACTIVATE_NOW)
1032                 return 0;
1033
1034         if (info->fbops->fb_get_caps) {
1035                 ret = fb_check_caps(info, var, activate);
1036
1037                 if (ret)
1038                         return ret;
1039         }
1040
1041         old_var = info->var;
1042         info->var = *var;
1043
1044         if (info->fbops->fb_set_par) {
1045                 ret = info->fbops->fb_set_par(info);
1046
1047                 if (ret) {
1048                         info->var = old_var;
1049                         printk(KERN_WARNING "detected "
1050                                 "fb_set_par error, "
1051                                 "error code: %d\n", ret);
1052                         return ret;
1053                 }
1054         }
1055
1056         fb_pan_display(info, &info->var);
1057         fb_set_cmap(&info->cmap, info);
1058         fb_var_to_videomode(&mode, &info->var);
1059
1060         if (info->modelist.prev && info->modelist.next &&
1061             !list_empty(&info->modelist))
1062                 ret = fb_add_videomode(&mode, &info->modelist);
1063
1064         if (ret)
1065                 return ret;
1066
1067         event.info = info;
1068         event.data = &mode;
1069         fb_notifier_call_chain(FB_EVENT_MODE_CHANGE, &event);
1070
1071         return 0;
1072 }
1073 EXPORT_SYMBOL(fb_set_var);
1074
1075 int
1076 fb_blank(struct fb_info *info, int blank)
1077 {
1078         struct fb_event event;
1079         int ret = -EINVAL;
1080
1081         if (blank > FB_BLANK_POWERDOWN)
1082                 blank = FB_BLANK_POWERDOWN;
1083
1084         event.info = info;
1085         event.data = &blank;
1086
1087         if (info->fbops->fb_blank)
1088                 ret = info->fbops->fb_blank(blank, info);
1089
1090         if (!ret)
1091                 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
1092
1093         return ret;
1094 }
1095 EXPORT_SYMBOL(fb_blank);
1096
1097 static long do_fb_ioctl(struct fb_info *info, unsigned int cmd,
1098                         unsigned long arg)
1099 {
1100         const struct fb_ops *fb;
1101         struct fb_var_screeninfo var;
1102         struct fb_fix_screeninfo fix;
1103         struct fb_cmap cmap_from;
1104         struct fb_cmap_user cmap;
1105         void __user *argp = (void __user *)arg;
1106         long ret = 0;
1107
1108         switch (cmd) {
1109         case FBIOGET_VSCREENINFO:
1110                 lock_fb_info(info);
1111                 var = info->var;
1112                 unlock_fb_info(info);
1113
1114                 ret = copy_to_user(argp, &var, sizeof(var)) ? -EFAULT : 0;
1115                 break;
1116         case FBIOPUT_VSCREENINFO:
1117                 if (copy_from_user(&var, argp, sizeof(var)))
1118                         return -EFAULT;
1119                 console_lock();
1120                 lock_fb_info(info);
1121                 ret = fbcon_modechange_possible(info, &var);
1122                 if (!ret)
1123                         ret = fb_set_var(info, &var);
1124                 if (!ret)
1125                         fbcon_update_vcs(info, var.activate & FB_ACTIVATE_ALL);
1126                 unlock_fb_info(info);
1127                 console_unlock();
1128                 if (!ret && copy_to_user(argp, &var, sizeof(var)))
1129                         ret = -EFAULT;
1130                 break;
1131         case FBIOGET_FSCREENINFO:
1132                 lock_fb_info(info);
1133                 memcpy(&fix, &info->fix, sizeof(fix));
1134                 if (info->flags & FBINFO_HIDE_SMEM_START)
1135                         fix.smem_start = 0;
1136                 unlock_fb_info(info);
1137
1138                 ret = copy_to_user(argp, &fix, sizeof(fix)) ? -EFAULT : 0;
1139                 break;
1140         case FBIOPUTCMAP:
1141                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1142                         return -EFAULT;
1143                 ret = fb_set_user_cmap(&cmap, info);
1144                 break;
1145         case FBIOGETCMAP:
1146                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1147                         return -EFAULT;
1148                 lock_fb_info(info);
1149                 cmap_from = info->cmap;
1150                 unlock_fb_info(info);
1151                 ret = fb_cmap_to_user(&cmap_from, &cmap);
1152                 break;
1153         case FBIOPAN_DISPLAY:
1154                 if (copy_from_user(&var, argp, sizeof(var)))
1155                         return -EFAULT;
1156                 console_lock();
1157                 lock_fb_info(info);
1158                 ret = fb_pan_display(info, &var);
1159                 unlock_fb_info(info);
1160                 console_unlock();
1161                 if (ret == 0 && copy_to_user(argp, &var, sizeof(var)))
1162                         return -EFAULT;
1163                 break;
1164         case FBIO_CURSOR:
1165                 ret = -EINVAL;
1166                 break;
1167         case FBIOGET_CON2FBMAP:
1168                 ret = fbcon_get_con2fb_map_ioctl(argp);
1169                 break;
1170         case FBIOPUT_CON2FBMAP:
1171                 ret = fbcon_set_con2fb_map_ioctl(argp);
1172                 break;
1173         case FBIOBLANK:
1174                 if (arg > FB_BLANK_POWERDOWN)
1175                         return -EINVAL;
1176                 console_lock();
1177                 lock_fb_info(info);
1178                 ret = fb_blank(info, arg);
1179                 /* might again call into fb_blank */
1180                 fbcon_fb_blanked(info, arg);
1181                 unlock_fb_info(info);
1182                 console_unlock();
1183                 break;
1184         default:
1185                 lock_fb_info(info);
1186                 fb = info->fbops;
1187                 if (fb->fb_ioctl)
1188                         ret = fb->fb_ioctl(info, cmd, arg);
1189                 else
1190                         ret = -ENOTTY;
1191                 unlock_fb_info(info);
1192         }
1193         return ret;
1194 }
1195
1196 static long fb_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1197 {
1198         struct fb_info *info = file_fb_info(file);
1199
1200         if (!info)
1201                 return -ENODEV;
1202         return do_fb_ioctl(info, cmd, arg);
1203 }
1204
1205 #ifdef CONFIG_COMPAT
1206 struct fb_fix_screeninfo32 {
1207         char                    id[16];
1208         compat_caddr_t          smem_start;
1209         u32                     smem_len;
1210         u32                     type;
1211         u32                     type_aux;
1212         u32                     visual;
1213         u16                     xpanstep;
1214         u16                     ypanstep;
1215         u16                     ywrapstep;
1216         u32                     line_length;
1217         compat_caddr_t          mmio_start;
1218         u32                     mmio_len;
1219         u32                     accel;
1220         u16                     reserved[3];
1221 };
1222
1223 struct fb_cmap32 {
1224         u32                     start;
1225         u32                     len;
1226         compat_caddr_t  red;
1227         compat_caddr_t  green;
1228         compat_caddr_t  blue;
1229         compat_caddr_t  transp;
1230 };
1231
1232 static int fb_getput_cmap(struct fb_info *info, unsigned int cmd,
1233                           unsigned long arg)
1234 {
1235         struct fb_cmap32 cmap32;
1236         struct fb_cmap cmap_from;
1237         struct fb_cmap_user cmap;
1238
1239         if (copy_from_user(&cmap32, compat_ptr(arg), sizeof(cmap32)))
1240                 return -EFAULT;
1241
1242         cmap = (struct fb_cmap_user) {
1243                 .start  = cmap32.start,
1244                 .len    = cmap32.len,
1245                 .red    = compat_ptr(cmap32.red),
1246                 .green  = compat_ptr(cmap32.green),
1247                 .blue   = compat_ptr(cmap32.blue),
1248                 .transp = compat_ptr(cmap32.transp),
1249         };
1250
1251         if (cmd == FBIOPUTCMAP)
1252                 return fb_set_user_cmap(&cmap, info);
1253
1254         lock_fb_info(info);
1255         cmap_from = info->cmap;
1256         unlock_fb_info(info);
1257
1258         return fb_cmap_to_user(&cmap_from, &cmap);
1259 }
1260
1261 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1262                                   struct fb_fix_screeninfo32 __user *fix32)
1263 {
1264         __u32 data;
1265         int err;
1266
1267         err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1268
1269         data = (__u32) (unsigned long) fix->smem_start;
1270         err |= put_user(data, &fix32->smem_start);
1271
1272         err |= put_user(fix->smem_len, &fix32->smem_len);
1273         err |= put_user(fix->type, &fix32->type);
1274         err |= put_user(fix->type_aux, &fix32->type_aux);
1275         err |= put_user(fix->visual, &fix32->visual);
1276         err |= put_user(fix->xpanstep, &fix32->xpanstep);
1277         err |= put_user(fix->ypanstep, &fix32->ypanstep);
1278         err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1279         err |= put_user(fix->line_length, &fix32->line_length);
1280
1281         data = (__u32) (unsigned long) fix->mmio_start;
1282         err |= put_user(data, &fix32->mmio_start);
1283
1284         err |= put_user(fix->mmio_len, &fix32->mmio_len);
1285         err |= put_user(fix->accel, &fix32->accel);
1286         err |= copy_to_user(fix32->reserved, fix->reserved,
1287                             sizeof(fix->reserved));
1288
1289         if (err)
1290                 return -EFAULT;
1291         return 0;
1292 }
1293
1294 static int fb_get_fscreeninfo(struct fb_info *info, unsigned int cmd,
1295                               unsigned long arg)
1296 {
1297         struct fb_fix_screeninfo fix;
1298
1299         lock_fb_info(info);
1300         fix = info->fix;
1301         if (info->flags & FBINFO_HIDE_SMEM_START)
1302                 fix.smem_start = 0;
1303         unlock_fb_info(info);
1304         return do_fscreeninfo_to_user(&fix, compat_ptr(arg));
1305 }
1306
1307 static long fb_compat_ioctl(struct file *file, unsigned int cmd,
1308                             unsigned long arg)
1309 {
1310         struct fb_info *info = file_fb_info(file);
1311         const struct fb_ops *fb;
1312         long ret = -ENOIOCTLCMD;
1313
1314         if (!info)
1315                 return -ENODEV;
1316         fb = info->fbops;
1317         switch(cmd) {
1318         case FBIOGET_VSCREENINFO:
1319         case FBIOPUT_VSCREENINFO:
1320         case FBIOPAN_DISPLAY:
1321         case FBIOGET_CON2FBMAP:
1322         case FBIOPUT_CON2FBMAP:
1323                 arg = (unsigned long) compat_ptr(arg);
1324                 fallthrough;
1325         case FBIOBLANK:
1326                 ret = do_fb_ioctl(info, cmd, arg);
1327                 break;
1328
1329         case FBIOGET_FSCREENINFO:
1330                 ret = fb_get_fscreeninfo(info, cmd, arg);
1331                 break;
1332
1333         case FBIOGETCMAP:
1334         case FBIOPUTCMAP:
1335                 ret = fb_getput_cmap(info, cmd, arg);
1336                 break;
1337
1338         default:
1339                 if (fb->fb_compat_ioctl)
1340                         ret = fb->fb_compat_ioctl(info, cmd, arg);
1341                 break;
1342         }
1343         return ret;
1344 }
1345 #endif
1346
1347 static int
1348 fb_mmap(struct file *file, struct vm_area_struct * vma)
1349 {
1350         struct fb_info *info = file_fb_info(file);
1351         unsigned long mmio_pgoff;
1352         unsigned long start;
1353         u32 len;
1354
1355         if (!info)
1356                 return -ENODEV;
1357         mutex_lock(&info->mm_lock);
1358
1359         if (info->fbops->fb_mmap) {
1360                 int res;
1361
1362                 /*
1363                  * The framebuffer needs to be accessed decrypted, be sure
1364                  * SME protection is removed ahead of the call
1365                  */
1366                 vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
1367                 res = info->fbops->fb_mmap(info, vma);
1368                 mutex_unlock(&info->mm_lock);
1369                 return res;
1370 #if IS_ENABLED(CONFIG_FB_DEFERRED_IO)
1371         } else if (info->fbdefio) {
1372                 /*
1373                  * FB deferred I/O wants you to handle mmap in your drivers. At a
1374                  * minimum, point struct fb_ops.fb_mmap to fb_deferred_io_mmap().
1375                  */
1376                 dev_warn_once(info->dev, "fbdev mmap not set up for deferred I/O.\n");
1377                 mutex_unlock(&info->mm_lock);
1378                 return -ENODEV;
1379 #endif
1380         }
1381
1382         /*
1383          * Ugh. This can be either the frame buffer mapping, or
1384          * if pgoff points past it, the mmio mapping.
1385          */
1386         start = info->fix.smem_start;
1387         len = info->fix.smem_len;
1388         mmio_pgoff = PAGE_ALIGN((start & ~PAGE_MASK) + len) >> PAGE_SHIFT;
1389         if (vma->vm_pgoff >= mmio_pgoff) {
1390                 if (info->var.accel_flags) {
1391                         mutex_unlock(&info->mm_lock);
1392                         return -EINVAL;
1393                 }
1394
1395                 vma->vm_pgoff -= mmio_pgoff;
1396                 start = info->fix.mmio_start;
1397                 len = info->fix.mmio_len;
1398         }
1399         mutex_unlock(&info->mm_lock);
1400
1401         vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
1402         fb_pgprotect(file, vma, start);
1403
1404         return vm_iomap_memory(vma, start, len);
1405 }
1406
1407 static int
1408 fb_open(struct inode *inode, struct file *file)
1409 __acquires(&info->lock)
1410 __releases(&info->lock)
1411 {
1412         int fbidx = iminor(inode);
1413         struct fb_info *info;
1414         int res = 0;
1415
1416         info = get_fb_info(fbidx);
1417         if (!info) {
1418                 request_module("fb%d", fbidx);
1419                 info = get_fb_info(fbidx);
1420                 if (!info)
1421                         return -ENODEV;
1422         }
1423         if (IS_ERR(info))
1424                 return PTR_ERR(info);
1425
1426         lock_fb_info(info);
1427         if (!try_module_get(info->fbops->owner)) {
1428                 res = -ENODEV;
1429                 goto out;
1430         }
1431         file->private_data = info;
1432         if (info->fbops->fb_open) {
1433                 res = info->fbops->fb_open(info,1);
1434                 if (res)
1435                         module_put(info->fbops->owner);
1436         }
1437 #ifdef CONFIG_FB_DEFERRED_IO
1438         if (info->fbdefio)
1439                 fb_deferred_io_open(info, inode, file);
1440 #endif
1441 out:
1442         unlock_fb_info(info);
1443         if (res)
1444                 put_fb_info(info);
1445         return res;
1446 }
1447
1448 static int
1449 fb_release(struct inode *inode, struct file *file)
1450 __acquires(&info->lock)
1451 __releases(&info->lock)
1452 {
1453         struct fb_info * const info = file->private_data;
1454
1455         lock_fb_info(info);
1456         if (info->fbops->fb_release)
1457                 info->fbops->fb_release(info,1);
1458         module_put(info->fbops->owner);
1459         unlock_fb_info(info);
1460         put_fb_info(info);
1461         return 0;
1462 }
1463
1464 #if defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && !defined(CONFIG_MMU)
1465 unsigned long get_fb_unmapped_area(struct file *filp,
1466                                    unsigned long addr, unsigned long len,
1467                                    unsigned long pgoff, unsigned long flags)
1468 {
1469         struct fb_info * const info = filp->private_data;
1470         unsigned long fb_size = PAGE_ALIGN(info->fix.smem_len);
1471
1472         if (pgoff > fb_size || len > fb_size - pgoff)
1473                 return -EINVAL;
1474
1475         return (unsigned long)info->screen_base + pgoff;
1476 }
1477 #endif
1478
1479 static const struct file_operations fb_fops = {
1480         .owner =        THIS_MODULE,
1481         .read =         fb_read,
1482         .write =        fb_write,
1483         .unlocked_ioctl = fb_ioctl,
1484 #ifdef CONFIG_COMPAT
1485         .compat_ioctl = fb_compat_ioctl,
1486 #endif
1487         .mmap =         fb_mmap,
1488         .open =         fb_open,
1489         .release =      fb_release,
1490 #if defined(HAVE_ARCH_FB_UNMAPPED_AREA) || \
1491         (defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && \
1492          !defined(CONFIG_MMU))
1493         .get_unmapped_area = get_fb_unmapped_area,
1494 #endif
1495 #ifdef CONFIG_FB_DEFERRED_IO
1496         .fsync =        fb_deferred_io_fsync,
1497 #endif
1498         .llseek =       default_llseek,
1499 };
1500
1501 struct class *fb_class;
1502 EXPORT_SYMBOL(fb_class);
1503
1504 static int fb_check_foreignness(struct fb_info *fi)
1505 {
1506         const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN;
1507
1508         fi->flags &= ~FBINFO_FOREIGN_ENDIAN;
1509
1510 #ifdef __BIG_ENDIAN
1511         fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH;
1512 #else
1513         fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0;
1514 #endif /* __BIG_ENDIAN */
1515
1516         if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) {
1517                 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to "
1518                        "support this framebuffer\n", fi->fix.id);
1519                 return -ENOSYS;
1520         } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) {
1521                 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to "
1522                        "support this framebuffer\n", fi->fix.id);
1523                 return -ENOSYS;
1524         }
1525
1526         return 0;
1527 }
1528
1529 static int do_register_framebuffer(struct fb_info *fb_info)
1530 {
1531         int i;
1532         struct fb_videomode mode;
1533
1534         if (fb_check_foreignness(fb_info))
1535                 return -ENOSYS;
1536
1537         if (num_registered_fb == FB_MAX)
1538                 return -ENXIO;
1539
1540         num_registered_fb++;
1541         for (i = 0 ; i < FB_MAX; i++)
1542                 if (!registered_fb[i])
1543                         break;
1544         fb_info->node = i;
1545         refcount_set(&fb_info->count, 1);
1546         mutex_init(&fb_info->lock);
1547         mutex_init(&fb_info->mm_lock);
1548
1549         fb_info->dev = device_create(fb_class, fb_info->device,
1550                                      MKDEV(FB_MAJOR, i), NULL, "fb%d", i);
1551         if (IS_ERR(fb_info->dev)) {
1552                 /* Not fatal */
1553                 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1554                 fb_info->dev = NULL;
1555         } else
1556                 fb_init_device(fb_info);
1557
1558         if (fb_info->pixmap.addr == NULL) {
1559                 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1560                 if (fb_info->pixmap.addr) {
1561                         fb_info->pixmap.size = FBPIXMAPSIZE;
1562                         fb_info->pixmap.buf_align = 1;
1563                         fb_info->pixmap.scan_align = 1;
1564                         fb_info->pixmap.access_align = 32;
1565                         fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1566                 }
1567         }
1568         fb_info->pixmap.offset = 0;
1569
1570         if (!fb_info->pixmap.blit_x)
1571                 fb_info->pixmap.blit_x = ~(u32)0;
1572
1573         if (!fb_info->pixmap.blit_y)
1574                 fb_info->pixmap.blit_y = ~(u32)0;
1575
1576         if (!fb_info->modelist.prev || !fb_info->modelist.next)
1577                 INIT_LIST_HEAD(&fb_info->modelist);
1578
1579         if (fb_info->skip_vt_switch)
1580                 pm_vt_switch_required(fb_info->dev, false);
1581         else
1582                 pm_vt_switch_required(fb_info->dev, true);
1583
1584         fb_var_to_videomode(&mode, &fb_info->var);
1585         fb_add_videomode(&mode, &fb_info->modelist);
1586         registered_fb[i] = fb_info;
1587
1588 #ifdef CONFIG_GUMSTIX_AM200EPD
1589         {
1590                 struct fb_event event;
1591                 event.info = fb_info;
1592                 fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1593         }
1594 #endif
1595
1596         return fbcon_fb_registered(fb_info);
1597 }
1598
1599 static void unbind_console(struct fb_info *fb_info)
1600 {
1601         int i = fb_info->node;
1602
1603         if (WARN_ON(i < 0 || i >= FB_MAX || registered_fb[i] != fb_info))
1604                 return;
1605
1606         fbcon_fb_unbind(fb_info);
1607 }
1608
1609 static void unlink_framebuffer(struct fb_info *fb_info)
1610 {
1611         int i;
1612
1613         i = fb_info->node;
1614         if (WARN_ON(i < 0 || i >= FB_MAX || registered_fb[i] != fb_info))
1615                 return;
1616
1617         if (!fb_info->dev)
1618                 return;
1619
1620         device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1621
1622         pm_vt_switch_unregister(fb_info->dev);
1623
1624         unbind_console(fb_info);
1625
1626         fb_info->dev = NULL;
1627 }
1628
1629 static void do_unregister_framebuffer(struct fb_info *fb_info)
1630 {
1631         unlink_framebuffer(fb_info);
1632         if (fb_info->pixmap.addr &&
1633             (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT)) {
1634                 kfree(fb_info->pixmap.addr);
1635                 fb_info->pixmap.addr = NULL;
1636         }
1637
1638         fb_destroy_modelist(&fb_info->modelist);
1639         registered_fb[fb_info->node] = NULL;
1640         num_registered_fb--;
1641         fb_cleanup_device(fb_info);
1642 #ifdef CONFIG_GUMSTIX_AM200EPD
1643         {
1644                 struct fb_event event;
1645                 event.info = fb_info;
1646                 fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1647         }
1648 #endif
1649         fbcon_fb_unregistered(fb_info);
1650
1651         /* this may free fb info */
1652         put_fb_info(fb_info);
1653 }
1654
1655 /**
1656  *      register_framebuffer - registers a frame buffer device
1657  *      @fb_info: frame buffer info structure
1658  *
1659  *      Registers a frame buffer device @fb_info.
1660  *
1661  *      Returns negative errno on error, or zero for success.
1662  *
1663  */
1664 int
1665 register_framebuffer(struct fb_info *fb_info)
1666 {
1667         int ret;
1668
1669         mutex_lock(&registration_lock);
1670         ret = do_register_framebuffer(fb_info);
1671         mutex_unlock(&registration_lock);
1672
1673         return ret;
1674 }
1675 EXPORT_SYMBOL(register_framebuffer);
1676
1677 /**
1678  *      unregister_framebuffer - releases a frame buffer device
1679  *      @fb_info: frame buffer info structure
1680  *
1681  *      Unregisters a frame buffer device @fb_info.
1682  *
1683  *      Returns negative errno on error, or zero for success.
1684  *
1685  *      This function will also notify the framebuffer console
1686  *      to release the driver.
1687  *
1688  *      This is meant to be called within a driver's module_exit()
1689  *      function. If this is called outside module_exit(), ensure
1690  *      that the driver implements fb_open() and fb_release() to
1691  *      check that no processes are using the device.
1692  */
1693 void
1694 unregister_framebuffer(struct fb_info *fb_info)
1695 {
1696         mutex_lock(&registration_lock);
1697         do_unregister_framebuffer(fb_info);
1698         mutex_unlock(&registration_lock);
1699 }
1700 EXPORT_SYMBOL(unregister_framebuffer);
1701
1702 /**
1703  *      fb_set_suspend - low level driver signals suspend
1704  *      @info: framebuffer affected
1705  *      @state: 0 = resuming, !=0 = suspending
1706  *
1707  *      This is meant to be used by low level drivers to
1708  *      signal suspend/resume to the core & clients.
1709  *      It must be called with the console semaphore held
1710  */
1711 void fb_set_suspend(struct fb_info *info, int state)
1712 {
1713         WARN_CONSOLE_UNLOCKED();
1714
1715         if (state) {
1716                 fbcon_suspended(info);
1717                 info->state = FBINFO_STATE_SUSPENDED;
1718         } else {
1719                 info->state = FBINFO_STATE_RUNNING;
1720                 fbcon_resumed(info);
1721         }
1722 }
1723 EXPORT_SYMBOL(fb_set_suspend);
1724
1725 /**
1726  *      fbmem_init - init frame buffer subsystem
1727  *
1728  *      Initialize the frame buffer subsystem.
1729  *
1730  *      NOTE: This function is _only_ to be called by drivers/char/mem.c.
1731  *
1732  */
1733
1734 static int __init
1735 fbmem_init(void)
1736 {
1737         int ret;
1738
1739         if (!proc_create_seq("fb", 0, NULL, &proc_fb_seq_ops))
1740                 return -ENOMEM;
1741
1742         ret = register_chrdev(FB_MAJOR, "fb", &fb_fops);
1743         if (ret) {
1744                 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1745                 goto err_chrdev;
1746         }
1747
1748         fb_class = class_create(THIS_MODULE, "graphics");
1749         if (IS_ERR(fb_class)) {
1750                 ret = PTR_ERR(fb_class);
1751                 pr_warn("Unable to create fb class; errno = %d\n", ret);
1752                 fb_class = NULL;
1753                 goto err_class;
1754         }
1755
1756         fb_console_init();
1757
1758         return 0;
1759
1760 err_class:
1761         unregister_chrdev(FB_MAJOR, "fb");
1762 err_chrdev:
1763         remove_proc_entry("fb", NULL);
1764         return ret;
1765 }
1766
1767 #ifdef MODULE
1768 module_init(fbmem_init);
1769 static void __exit
1770 fbmem_exit(void)
1771 {
1772         fb_console_exit();
1773
1774         remove_proc_entry("fb", NULL);
1775         class_destroy(fb_class);
1776         unregister_chrdev(FB_MAJOR, "fb");
1777 }
1778
1779 module_exit(fbmem_exit);
1780 MODULE_LICENSE("GPL");
1781 MODULE_DESCRIPTION("Framebuffer base");
1782 #else
1783 subsys_initcall(fbmem_init);
1784 #endif
1785
1786 int fb_new_modelist(struct fb_info *info)
1787 {
1788         struct fb_var_screeninfo var = info->var;
1789         struct list_head *pos, *n;
1790         struct fb_modelist *modelist;
1791         struct fb_videomode *m, mode;
1792         int err;
1793
1794         list_for_each_safe(pos, n, &info->modelist) {
1795                 modelist = list_entry(pos, struct fb_modelist, list);
1796                 m = &modelist->mode;
1797                 fb_videomode_to_var(&var, m);
1798                 var.activate = FB_ACTIVATE_TEST;
1799                 err = fb_set_var(info, &var);
1800                 fb_var_to_videomode(&mode, &var);
1801                 if (err || !fb_mode_is_equal(m, &mode)) {
1802                         list_del(pos);
1803                         kfree(pos);
1804                 }
1805         }
1806
1807         if (list_empty(&info->modelist))
1808                 return 1;
1809
1810         fbcon_new_modelist(info);
1811
1812         return 0;
1813 }
1814
1815 #if defined(CONFIG_VIDEO_NOMODESET)
1816 bool fb_modesetting_disabled(const char *drvname)
1817 {
1818         bool fwonly = video_firmware_drivers_only();
1819
1820         if (fwonly)
1821                 pr_warn("Driver %s not loading because of nomodeset parameter\n",
1822                         drvname);
1823
1824         return fwonly;
1825 }
1826 EXPORT_SYMBOL(fb_modesetting_disabled);
1827 #endif
1828
1829 MODULE_LICENSE("GPL");