drivers/video/fbmem.c

   1 /*
   2  *  linux/drivers/video/fbmem.c
   3  *
   4  *  Copyright (C) 1994 Martin Schaller
   5  *
   6  *      2001 - Documented with DocBook
   7  *      - Brad Douglas <brad@neruo.com>
   8  *
   9  * This file is subject to the terms and conditions of the GNU General Public
  10  * License.  See the file COPYING in the main directory of this archive
  11  * for more details.
  12  */
  13
  14 #include <linux/module.h>
  15
  16 #include <linux/compat.h>
  17 #include <linux/types.h>
  18 #include <linux/errno.h>
  19 #include <linux/smp_lock.h>
  20 #include <linux/kernel.h>
  21 #include <linux/major.h>
  22 #include <linux/slab.h>
  23 #include <linux/mm.h>
  24 #include <linux/mman.h>
  25 #include <linux/vt.h>
  26 #include <linux/init.h>
  27 #include <linux/linux_logo.h>
  28 #include <linux/proc_fs.h>
  29 #include <linux/console.h>
  30 #ifdef CONFIG_KMOD
  31 #include <linux/kmod.h>
  32 #endif
  33 #include <linux/err.h>
  34 #include <linux/device.h>
  35 #include <linux/efi.h>
  36 #include <linux/fb.h>
  37
  38 #include <asm/fb.h>
  39
  40
  41     /*
  42      *  Frame buffer device initialization and setup routines
  43      */
  44
  45 #define FBPIXMAPSIZE    (1024 * 8)
  46
  47 struct fb_info *registered_fb[FB_MAX] __read_mostly;
  48 int num_registered_fb __read_mostly;
  49
  50 /*
  51  * Helpers
  52  */
  53
  54 int fb_get_color_depth(struct fb_var_screeninfo *var,
  55                        struct fb_fix_screeninfo *fix)
  56 {
  57         int depth = 0;
  58
  59         if (fix->visual == FB_VISUAL_MONO01 ||
  60             fix->visual == FB_VISUAL_MONO10)
  61                 depth = 1;
  62         else {
  63                 if (var->green.length == var->blue.length &&
  64                     var->green.length == var->red.length &&
  65                     var->green.offset == var->blue.offset &&
  66                     var->green.offset == var->red.offset)
  67                         depth = var->green.length;
  68                 else
  69                         depth = var->green.length + var->red.length +
  70                                 var->blue.length;
  71         }
  72
  73         return depth;
  74 }
  75 EXPORT_SYMBOL(fb_get_color_depth);
  76
  77 /*
  78  * Data padding functions.
  79  */
  80 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
  81 {
  82         __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
  83 }
  84 EXPORT_SYMBOL(fb_pad_aligned_buffer);
  85
  86 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
  87                                 u32 shift_high, u32 shift_low, u32 mod)
  88 {
  89         u8 mask = (u8) (0xfff << shift_high), tmp;
  90         int i, j;
  91
  92         for (i = height; i--; ) {
  93                 for (j = 0; j < idx; j++) {
  94                         tmp = dst[j];
  95                         tmp &= mask;
  96                         tmp |= *src >> shift_low;
  97                         dst[j] = tmp;
  98                         tmp = *src << shift_high;
  99                         dst[j+1] = tmp;
 100                         src++;
 101                 }
 102                 tmp = dst[idx];
 103                 tmp &= mask;
 104                 tmp |= *src >> shift_low;
 105                 dst[idx] = tmp;
 106                 if (shift_high < mod) {
 107                         tmp = *src << shift_high;
 108                         dst[idx+1] = tmp;
 109                 }
 110                 src++;
 111                 dst += d_pitch;
 112         }
 113 }
 114 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
 115
 116 /*
 117  * we need to lock this section since fb_cursor
 118  * may use fb_imageblit()
 119  */
 120 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
 121 {
 122         u32 align = buf->buf_align - 1, offset;
 123         char *addr = buf->addr;
 124
 125         /* If IO mapped, we need to sync before access, no sharing of
 126          * the pixmap is done
 127          */
 128         if (buf->flags & FB_PIXMAP_IO) {
 129                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 130                         info->fbops->fb_sync(info);
 131                 return addr;
 132         }
 133
 134         /* See if we fit in the remaining pixmap space */
 135         offset = buf->offset + align;
 136         offset &= ~align;
 137         if (offset + size > buf->size) {
 138                 /* We do not fit. In order to be able to re-use the buffer,
 139                  * we must ensure no asynchronous DMA'ing or whatever operation
 140                  * is in progress, we sync for that.
 141                  */
 142                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 143                         info->fbops->fb_sync(info);
 144                 offset = 0;
 145         }
 146         buf->offset = offset + size;
 147         addr += offset;
 148
 149         return addr;
 150 }
 151
 152 #ifdef CONFIG_LOGO
 153
 154 static inline unsigned safe_shift(unsigned d, int n)
 155 {
 156         return n < 0 ? d >> -n : d << n;
 157 }
 158
 159 static void fb_set_logocmap(struct fb_info *info,
 160                                    const struct linux_logo *logo)
 161 {
 162         struct fb_cmap palette_cmap;
 163         u16 palette_green[16];
 164         u16 palette_blue[16];
 165         u16 palette_red[16];
 166         int i, j, n;
 167         const unsigned char *clut = logo->clut;
 168
 169         palette_cmap.start = 0;
 170         palette_cmap.len = 16;
 171         palette_cmap.red = palette_red;
 172         palette_cmap.green = palette_green;
 173         palette_cmap.blue = palette_blue;
 174         palette_cmap.transp = NULL;
 175
 176         for (i = 0; i < logo->clutsize; i += n) {
 177                 n = logo->clutsize - i;
 178                 /* palette_cmap provides space for only 16 colors at once */
 179                 if (n > 16)
 180                         n = 16;
 181                 palette_cmap.start = 32 + i;
 182                 palette_cmap.len = n;
 183                 for (j = 0; j < n; ++j) {
 184                         palette_cmap.red[j] = clut[0] << 8 | clut[0];
 185                         palette_cmap.green[j] = clut[1] << 8 | clut[1];
 186                         palette_cmap.blue[j] = clut[2] << 8 | clut[2];
 187                         clut += 3;
 188                 }
 189                 fb_set_cmap(&palette_cmap, info);
 190         }
 191 }
 192
 193 static void  fb_set_logo_truepalette(struct fb_info *info,
 194                                             const struct linux_logo *logo,
 195                                             u32 *palette)
 196 {
 197         static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
 198         unsigned char redmask, greenmask, bluemask;
 199         int redshift, greenshift, blueshift;
 200         int i;
 201         const unsigned char *clut = logo->clut;
 202
 203         /*
 204          * We have to create a temporary palette since console palette is only
 205          * 16 colors long.
 206          */
 207         /* Bug: Doesn't obey msb_right ... (who needs that?) */
 208         redmask   = mask[info->var.red.length   < 8 ? info->var.red.length   : 8];
 209         greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
 210         bluemask  = mask[info->var.blue.length  < 8 ? info->var.blue.length  : 8];
 211         redshift   = info->var.red.offset   - (8 - info->var.red.length);
 212         greenshift = info->var.green.offset - (8 - info->var.green.length);
 213         blueshift  = info->var.blue.offset  - (8 - info->var.blue.length);
 214
 215         for ( i = 0; i < logo->clutsize; i++) {
 216                 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
 217                                  safe_shift((clut[1] & greenmask), greenshift) |
 218                                  safe_shift((clut[2] & bluemask), blueshift));
 219                 clut += 3;
 220         }
 221 }
 222
 223 static void fb_set_logo_directpalette(struct fb_info *info,
 224                                              const struct linux_logo *logo,
 225                                              u32 *palette)
 226 {
 227         int redshift, greenshift, blueshift;
 228         int i;
 229
 230         redshift = info->var.red.offset;
 231         greenshift = info->var.green.offset;
 232         blueshift = info->var.blue.offset;
 233
 234         for (i = 32; i < logo->clutsize; i++)
 235                 palette[i] = i << redshift | i << greenshift | i << blueshift;
 236 }
 237
 238 static void fb_set_logo(struct fb_info *info,
 239                                const struct linux_logo *logo, u8 *dst,
 240                                int depth)
 241 {
 242         int i, j, k;
 243         const u8 *src = logo->data;
 244         u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
 245         u8 fg = 1, d;
 246
 247         if (fb_get_color_depth(&info->var, &info->fix) == 3)
 248                 fg = 7;
 249
 250         if (info->fix.visual == FB_VISUAL_MONO01 ||
 251             info->fix.visual == FB_VISUAL_MONO10)
 252                 fg = ~((u8) (0xfff << info->var.green.length));
 253
 254         switch (depth) {
 255         case 4:
 256                 for (i = 0; i < logo->height; i++)
 257                         for (j = 0; j < logo->width; src++) {
 258                                 *dst++ = *src >> 4;
 259                                 j++;
 260                                 if (j < logo->width) {
 261                                         *dst++ = *src & 0x0f;
 262                                         j++;
 263                                 }
 264                         }
 265                 break;
 266         case 1:
 267                 for (i = 0; i < logo->height; i++) {
 268                         for (j = 0; j < logo->width; src++) {
 269                                 d = *src ^ xor;
 270                                 for (k = 7; k >= 0; k--) {
 271                                         *dst++ = ((d >> k) & 1) ? fg : 0;
 272                                         j++;
 273                                 }
 274                         }
 275                 }
 276                 break;
 277         }
 278 }
 279
 280 /*
 281  * Three (3) kinds of logo maps exist.  linux_logo_clut224 (>16 colors),
 282  * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors).  Depending on
 283  * the visual format and color depth of the framebuffer, the DAC, the
 284  * pseudo_palette, and the logo data will be adjusted accordingly.
 285  *
 286  * Case 1 - linux_logo_clut224:
 287  * Color exceeds the number of console colors (16), thus we set the hardware DAC
 288  * using fb_set_cmap() appropriately.  The "needs_cmapreset"  flag will be set.
 289  *
 290  * For visuals that require color info from the pseudo_palette, we also construct
 291  * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
 292  * will be set.
 293  *
 294  * Case 2 - linux_logo_vga16:
 295  * The number of colors just matches the console colors, thus there is no need
 296  * to set the DAC or the pseudo_palette.  However, the bitmap is packed, ie,
 297  * each byte contains color information for two pixels (upper and lower nibble).
 298  * To be consistent with fb_imageblit() usage, we therefore separate the two
 299  * nibbles into separate bytes. The "depth" flag will be set to 4.
 300  *
 301  * Case 3 - linux_logo_mono:
 302  * This is similar with Case 2.  Each byte contains information for 8 pixels.
 303  * We isolate each bit and expand each into a byte. The "depth" flag will
 304  * be set to 1.
 305  */
 306 static struct logo_data {
 307         int depth;
 308         int needs_directpalette;
 309         int needs_truepalette;
 310         int needs_cmapreset;
 311         const struct linux_logo *logo;
 312 } fb_logo __read_mostly;
 313
 314 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
 315 {
 316         u32 size = width * height, i;
 317
 318         out += size - 1;
 319
 320         for (i = size; i--; )
 321                 *out-- = *in++;
 322 }
 323
 324 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
 325 {
 326         int i, j, h = height - 1;
 327
 328         for (i = 0; i < height; i++)
 329                 for (j = 0; j < width; j++)
 330                                 out[height * j + h - i] = *in++;
 331 }
 332
 333 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
 334 {
 335         int i, j, w = width - 1;
 336
 337         for (i = 0; i < height; i++)
 338                 for (j = 0; j < width; j++)
 339                         out[height * (w - j) + i] = *in++;
 340 }
 341
 342 static void fb_rotate_logo(struct fb_info *info, u8 *dst,
 343                            struct fb_image *image, int rotate)
 344 {
 345         u32 tmp;
 346
 347         if (rotate == FB_ROTATE_UD) {
 348                 fb_rotate_logo_ud(image->data, dst, image->width,
 349                                   image->height);
 350                 image->dx = info->var.xres - image->width - image->dx;
 351                 image->dy = info->var.yres - image->height - image->dy;
 352         } else if (rotate == FB_ROTATE_CW) {
 353                 fb_rotate_logo_cw(image->data, dst, image->width,
 354                                   image->height);
 355                 tmp = image->width;
 356                 image->width = image->height;
 357                 image->height = tmp;
 358                 tmp = image->dy;
 359                 image->dy = image->dx;
 360                 image->dx = info->var.xres - image->width - tmp;
 361         } else if (rotate == FB_ROTATE_CCW) {
 362                 fb_rotate_logo_ccw(image->data, dst, image->width,
 363                                    image->height);
 364                 tmp = image->width;
 365                 image->width = image->height;
 366                 image->height = tmp;
 367                 tmp = image->dx;
 368                 image->dx = image->dy;
 369                 image->dy = info->var.yres - image->height - tmp;
 370         }
 371
 372         image->data = dst;
 373 }
 374
 375 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
 376                             int rotate, unsigned int num)
 377 {
 378         unsigned int x;
 379
 380         if (rotate == FB_ROTATE_UR) {
 381                 for (x = 0;
 382                      x < num && image->dx + image->width <= info->var.xres;
 383                      x++) {
 384                         info->fbops->fb_imageblit(info, image);
 385                         image->dx += image->width + 8;
 386                 }
 387         } else if (rotate == FB_ROTATE_UD) {
 388                 for (x = 0; x < num && image->dx >= 0; x++) {
 389                         info->fbops->fb_imageblit(info, image);
 390                         image->dx -= image->width + 8;
 391                 }
 392         } else if (rotate == FB_ROTATE_CW) {
 393                 for (x = 0;
 394                      x < num && image->dy + image->height <= info->var.yres;
 395                      x++) {
 396                         info->fbops->fb_imageblit(info, image);
 397                         image->dy += image->height + 8;
 398                 }
 399         } else if (rotate == FB_ROTATE_CCW) {
 400                 for (x = 0; x < num && image->dy >= 0; x++) {
 401                         info->fbops->fb_imageblit(info, image);
 402                         image->dy -= image->height + 8;
 403                 }
 404         }
 405 }
 406
 407 int fb_prepare_logo(struct fb_info *info, int rotate)
 408 {
 409         int depth = fb_get_color_depth(&info->var, &info->fix);
 410         int yres;
 411
 412         memset(&fb_logo, 0, sizeof(struct logo_data));
 413
 414         if (info->flags & FBINFO_MISC_TILEBLITTING ||
 415             info->flags & FBINFO_MODULE)
 416                 return 0;
 417
 418         if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
 419                 depth = info->var.blue.length;
 420                 if (info->var.red.length < depth)
 421                         depth = info->var.red.length;
 422                 if (info->var.green.length < depth)
 423                         depth = info->var.green.length;
 424         }
 425
 426         if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) {
 427                 /* assume console colormap */
 428                 depth = 4;
 429         }
 430
 431         if (depth >= 8) {
 432                 switch (info->fix.visual) {
 433                 case FB_VISUAL_TRUECOLOR:
 434                         fb_logo.needs_truepalette = 1;
 435                         break;
 436                 case FB_VISUAL_DIRECTCOLOR:
 437                         fb_logo.needs_directpalette = 1;
 438                         fb_logo.needs_cmapreset = 1;
 439                         break;
 440                 case FB_VISUAL_PSEUDOCOLOR:
 441                         fb_logo.needs_cmapreset = 1;
 442                         break;
 443                 }
 444         }
 445
 446         /* Return if no suitable logo was found */
 447         fb_logo.logo = fb_find_logo(depth);
 448
 449         if (!fb_logo.logo) {
 450                 return 0;
 451         }
 452
 453         if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
 454                 yres = info->var.yres;
 455         else
 456                 yres = info->var.xres;
 457
 458         if (fb_logo.logo->height > yres) {
 459                 fb_logo.logo = NULL;
 460                 return 0;
 461         }
 462
 463         /* What depth we asked for might be different from what we get */
 464         if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
 465                 fb_logo.depth = 8;
 466         else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
 467                 fb_logo.depth = 4;
 468         else
 469                 fb_logo.depth = 1;
 470         return fb_logo.logo->height;
 471 }
 472
 473 static int fb_show_logo_line(struct fb_info *info, int rotate,
 474                              const struct linux_logo *logo, int y,
 475                              unsigned int n)
 476 {
 477         u32 *palette = NULL, *saved_pseudo_palette = NULL;
 478         unsigned char *logo_new = NULL, *logo_rotate = NULL;
 479         struct fb_image image;
 480
 481         /* Return if the frame buffer is not mapped or suspended */
 482         if (logo == NULL || info->state != FBINFO_STATE_RUNNING ||
 483             info->flags & FBINFO_MODULE)
 484                 return 0;
 485
 486         image.depth = 8;
 487         image.data = logo->data;
 488
 489         if (fb_logo.needs_cmapreset)
 490                 fb_set_logocmap(info, logo);
 491
 492         if (fb_logo.needs_truepalette ||
 493             fb_logo.needs_directpalette) {
 494                 palette = kmalloc(256 * 4, GFP_KERNEL);
 495                 if (palette == NULL)
 496                         return 0;
 497
 498                 if (fb_logo.needs_truepalette)
 499                         fb_set_logo_truepalette(info, logo, palette);
 500                 else
 501                         fb_set_logo_directpalette(info, logo, palette);
 502
 503                 saved_pseudo_palette = info->pseudo_palette;
 504                 info->pseudo_palette = palette;
 505         }
 506
 507         if (fb_logo.depth <= 4) {
 508                 logo_new = kmalloc(logo->width * logo->height, GFP_KERNEL);
 509                 if (logo_new == NULL) {
 510                         kfree(palette);
 511                         if (saved_pseudo_palette)
 512                                 info->pseudo_palette = saved_pseudo_palette;
 513                         return 0;
 514                 }
 515                 image.data = logo_new;
 516                 fb_set_logo(info, logo, logo_new, fb_logo.depth);
 517         }
 518
 519         image.dx = 0;
 520         image.dy = y;
 521         image.width = logo->width;
 522         image.height = logo->height;
 523
 524         if (rotate) {
 525                 logo_rotate = kmalloc(logo->width *
 526                                       logo->height, GFP_KERNEL);
 527                 if (logo_rotate)
 528                         fb_rotate_logo(info, logo_rotate, &image, rotate);
 529         }
 530
 531         fb_do_show_logo(info, &image, rotate, n);
 532
 533         kfree(palette);
 534         if (saved_pseudo_palette != NULL)
 535                 info->pseudo_palette = saved_pseudo_palette;
 536         kfree(logo_new);
 537         kfree(logo_rotate);
 538         return logo->height;
 539 }
 540
 541 int fb_show_logo(struct fb_info *info, int rotate)
 542 {
 543         return fb_show_logo_line(info, rotate, fb_logo.logo, 0,
 544                                  num_online_cpus());
 545 }
 546 #else
 547 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
 548 int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
 549 #endif /* CONFIG_LOGO */
 550
 551 static int fbmem_read_proc(char *buf, char **start, off_t offset,
 552                            int len, int *eof, void *private)
 553 {
 554         struct fb_info **fi;
 555         int clen;
 556
 557         clen = 0;
 558         for (fi = registered_fb; fi < &registered_fb[FB_MAX] && clen < 4000;
 559              fi++)
 560                 if (*fi)
 561                         clen += sprintf(buf + clen, "%d %s\n",
 562                                         (*fi)->node,
 563                                         (*fi)->fix.id);
 564         *start = buf + offset;
 565         if (clen > offset)
 566                 clen -= offset;
 567         else
 568                 clen = 0;
 569         return clen < len ? clen : len;
 570 }
 571
 572 static ssize_t
 573 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 574 {
 575         unsigned long p = *ppos;
 576         struct inode *inode = file->f_path.dentry->d_inode;
 577         int fbidx = iminor(inode);
 578         struct fb_info *info = registered_fb[fbidx];
 579         u32 *buffer, *dst;
 580         u32 __iomem *src;
 581         int c, i, cnt = 0, err = 0;
 582         unsigned long total_size;
 583
 584         if (!info || ! info->screen_base)
 585                 return -ENODEV;
 586
 587         if (info->state != FBINFO_STATE_RUNNING)
 588                 return -EPERM;
 589
 590         if (info->fbops->fb_read)
 591                 return info->fbops->fb_read(info, buf, count, ppos);
 592
 593         total_size = info->screen_size;
 594
 595         if (total_size == 0)
 596                 total_size = info->fix.smem_len;
 597
 598         if (p >= total_size)
 599                 return 0;
 600
 601         if (count >= total_size)
 602                 count = total_size;
 603
 604         if (count + p > total_size)
 605                 count = total_size - p;
 606
 607         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 608                          GFP_KERNEL);
 609         if (!buffer)
 610                 return -ENOMEM;
 611
 612         src = (u32 __iomem *) (info->screen_base + p);
 613
 614         if (info->fbops->fb_sync)
 615                 info->fbops->fb_sync(info);
 616
 617         while (count) {
 618                 c  = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 619                 dst = buffer;
 620                 for (i = c >> 2; i--; )
 621                         *dst++ = fb_readl(src++);
 622                 if (c & 3) {
 623                         u8 *dst8 = (u8 *) dst;
 624                         u8 __iomem *src8 = (u8 __iomem *) src;
 625
 626                         for (i = c & 3; i--;)
 627                                 *dst8++ = fb_readb(src8++);
 628
 629                         src = (u32 __iomem *) src8;
 630                 }
 631
 632                 if (copy_to_user(buf, buffer, c)) {
 633                         err = -EFAULT;
 634                         break;
 635                 }
 636                 *ppos += c;
 637                 buf += c;
 638                 cnt += c;
 639                 count -= c;
 640         }
 641
 642         kfree(buffer);
 643
 644         return (err) ? err : cnt;
 645 }
 646
 647 static ssize_t
 648 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 649 {
 650         unsigned long p = *ppos;
 651         struct inode *inode = file->f_path.dentry->d_inode;
 652         int fbidx = iminor(inode);
 653         struct fb_info *info = registered_fb[fbidx];
 654         u32 *buffer, *src;
 655         u32 __iomem *dst;
 656         int c, i, cnt = 0, err = 0;
 657         unsigned long total_size;
 658
 659         if (!info || !info->screen_base)
 660                 return -ENODEV;
 661
 662         if (info->state != FBINFO_STATE_RUNNING)
 663                 return -EPERM;
 664
 665         if (info->fbops->fb_write)
 666                 return info->fbops->fb_write(info, buf, count, ppos);
 667
 668         total_size = info->screen_size;
 669
 670         if (total_size == 0)
 671                 total_size = info->fix.smem_len;
 672
 673         if (p > total_size)
 674                 return -EFBIG;
 675
 676         if (count > total_size) {
 677                 err = -EFBIG;
 678                 count = total_size;
 679         }
 680
 681         if (count + p > total_size) {
 682                 if (!err)
 683                         err = -ENOSPC;
 684
 685                 count = total_size - p;
 686         }
 687
 688         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 689                          GFP_KERNEL);
 690         if (!buffer)
 691                 return -ENOMEM;
 692
 693         dst = (u32 __iomem *) (info->screen_base + p);
 694
 695         if (info->fbops->fb_sync)
 696                 info->fbops->fb_sync(info);
 697
 698         while (count) {
 699                 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 700                 src = buffer;
 701
 702                 if (copy_from_user(src, buf, c)) {
 703                         err = -EFAULT;
 704                         break;
 705                 }
 706
 707                 for (i = c >> 2; i--; )
 708                         fb_writel(*src++, dst++);
 709
 710                 if (c & 3) {
 711                         u8 *src8 = (u8 *) src;
 712                         u8 __iomem *dst8 = (u8 __iomem *) dst;
 713
 714                         for (i = c & 3; i--; )
 715                                 fb_writeb(*src8++, dst8++);
 716
 717                         dst = (u32 __iomem *) dst8;
 718                 }
 719
 720                 *ppos += c;
 721                 buf += c;
 722                 cnt += c;
 723                 count -= c;
 724         }
 725
 726         kfree(buffer);
 727
 728         return (cnt) ? cnt : err;
 729 }
 730
 731 #ifdef CONFIG_KMOD
 732 static void try_to_load(int fb)
 733 {
 734         request_module("fb%d", fb);
 735 }
 736 #endif /* CONFIG_KMOD */
 737
 738 int
 739 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
 740 {
 741         struct fb_fix_screeninfo *fix = &info->fix;
 742         int xoffset = var->xoffset;
 743         int yoffset = var->yoffset;
 744         int err = 0, yres = info->var.yres;
 745
 746         if (var->yoffset > 0) {
 747                 if (var->vmode & FB_VMODE_YWRAP) {
 748                         if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
 749                                 err = -EINVAL;
 750                         else
 751                                 yres = 0;
 752                 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
 753                         err = -EINVAL;
 754         }
 755
 756         if (var->xoffset > 0 && (!fix->xpanstep ||
 757                                  (var->xoffset % fix->xpanstep)))
 758                 err = -EINVAL;
 759
 760         if (err || !info->fbops->fb_pan_display || xoffset < 0 ||
 761             yoffset < 0 || var->yoffset + yres > info->var.yres_virtual ||
 762             var->xoffset + info->var.xres > info->var.xres_virtual)
 763                 return -EINVAL;
 764
 765         if ((err = info->fbops->fb_pan_display(var, info)))
 766                 return err;
 767         info->var.xoffset = var->xoffset;
 768         info->var.yoffset = var->yoffset;
 769         if (var->vmode & FB_VMODE_YWRAP)
 770                 info->var.vmode |= FB_VMODE_YWRAP;
 771         else
 772                 info->var.vmode &= ~FB_VMODE_YWRAP;
 773         return 0;
 774 }
 775
 776 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var,
 777                          u32 activate)
 778 {
 779         struct fb_event event;
 780         struct fb_blit_caps caps, fbcaps;
 781         int err = 0;
 782
 783         memset(&caps, 0, sizeof(caps));
 784         memset(&fbcaps, 0, sizeof(fbcaps));
 785         caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0;
 786         event.info = info;
 787         event.data = &caps;
 788         fb_notifier_call_chain(FB_EVENT_GET_REQ, &event);
 789         info->fbops->fb_get_caps(info, &fbcaps, var);
 790
 791         if (((fbcaps.x ^ caps.x) & caps.x) ||
 792             ((fbcaps.y ^ caps.y) & caps.y) ||
 793             (fbcaps.len < caps.len))
 794                 err = -EINVAL;
 795
 796         return err;
 797 }
 798
 799 int
 800 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
 801 {
 802         int flags = info->flags;
 803         int ret = 0;
 804
 805         if (var->activate & FB_ACTIVATE_INV_MODE) {
 806                 struct fb_videomode mode1, mode2;
 807
 808                 fb_var_to_videomode(&mode1, var);
 809                 fb_var_to_videomode(&mode2, &info->var);
 810                 /* make sure we don't delete the videomode of current var */
 811                 ret = fb_mode_is_equal(&mode1, &mode2);
 812
 813                 if (!ret) {
 814                     struct fb_event event;
 815
 816                     event.info = info;
 817                     event.data = &mode1;
 818                     ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event);
 819                 }
 820
 821                 if (!ret)
 822                     fb_delete_videomode(&mode1, &info->modelist);
 823
 824
 825                 ret = (ret) ? -EINVAL : 0;
 826                 goto done;
 827         }
 828
 829         if ((var->activate & FB_ACTIVATE_FORCE) ||
 830             memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
 831                 u32 activate = var->activate;
 832
 833                 if (!info->fbops->fb_check_var) {
 834                         *var = info->var;
 835                         goto done;
 836                 }
 837
 838                 ret = info->fbops->fb_check_var(var, info);
 839
 840                 if (ret)
 841                         goto done;
 842
 843                 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
 844                         struct fb_videomode mode;
 845
 846                         if (info->fbops->fb_get_caps) {
 847                                 ret = fb_check_caps(info, var, activate);
 848
 849                                 if (ret)
 850                                         goto done;
 851                         }
 852
 853                         info->var = *var;
 854
 855                         if (info->fbops->fb_set_par)
 856                                 info->fbops->fb_set_par(info);
 857
 858                         fb_pan_display(info, &info->var);
 859                         fb_set_cmap(&info->cmap, info);
 860                         fb_var_to_videomode(&mode, &info->var);
 861
 862                         if (info->modelist.prev && info->modelist.next &&
 863                             !list_empty(&info->modelist))
 864                                 ret = fb_add_videomode(&mode, &info->modelist);
 865
 866                         if (!ret && (flags & FBINFO_MISC_USEREVENT)) {
 867                                 struct fb_event event;
 868                                 int evnt = (activate & FB_ACTIVATE_ALL) ?
 869                                         FB_EVENT_MODE_CHANGE_ALL :
 870                                         FB_EVENT_MODE_CHANGE;
 871
 872                                 info->flags &= ~FBINFO_MISC_USEREVENT;
 873                                 event.info = info;
 874                                 fb_notifier_call_chain(evnt, &event);
 875                         }
 876                 }
 877         }
 878
 879  done:
 880         return ret;
 881 }
 882
 883 int
 884 fb_blank(struct fb_info *info, int blank)
 885 {
 886         int ret = -EINVAL;
 887
 888         if (blank > FB_BLANK_POWERDOWN)
 889                 blank = FB_BLANK_POWERDOWN;
 890
 891         if (info->fbops->fb_blank)
 892                 ret = info->fbops->fb_blank(blank, info);
 893
 894         if (!ret) {
 895                 struct fb_event event;
 896
 897                 event.info = info;
 898                 event.data = &blank;
 899                 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
 900         }
 901
 902         return ret;
 903 }
 904
 905 static int
 906 fb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
 907          unsigned long arg)
 908 {
 909         int fbidx = iminor(inode);
 910         struct fb_info *info = registered_fb[fbidx];
 911         struct fb_ops *fb = info->fbops;
 912         struct fb_var_screeninfo var;
 913         struct fb_fix_screeninfo fix;
 914         struct fb_con2fbmap con2fb;
 915         struct fb_cmap_user cmap;
 916         struct fb_event event;
 917         void __user *argp = (void __user *)arg;
 918         int i;
 919
 920         if (!fb)
 921                 return -ENODEV;
 922         switch (cmd) {
 923         case FBIOGET_VSCREENINFO:
 924                 return copy_to_user(argp, &info->var,
 925                                     sizeof(var)) ? -EFAULT : 0;
 926         case FBIOPUT_VSCREENINFO:
 927                 if (copy_from_user(&var, argp, sizeof(var)))
 928                         return -EFAULT;
 929                 acquire_console_sem();
 930                 info->flags |= FBINFO_MISC_USEREVENT;
 931                 i = fb_set_var(info, &var);
 932                 info->flags &= ~FBINFO_MISC_USEREVENT;
 933                 release_console_sem();
 934                 if (i) return i;
 935                 if (copy_to_user(argp, &var, sizeof(var)))
 936                         return -EFAULT;
 937                 return 0;
 938         case FBIOGET_FSCREENINFO:
 939                 return copy_to_user(argp, &info->fix,
 940                                     sizeof(fix)) ? -EFAULT : 0;
 941         case FBIOPUTCMAP:
 942                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
 943                         return -EFAULT;
 944                 return (fb_set_user_cmap(&cmap, info));
 945         case FBIOGETCMAP:
 946                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
 947                         return -EFAULT;
 948                 return fb_cmap_to_user(&info->cmap, &cmap);
 949         case FBIOPAN_DISPLAY:
 950                 if (copy_from_user(&var, argp, sizeof(var)))
 951                         return -EFAULT;
 952                 acquire_console_sem();
 953                 i = fb_pan_display(info, &var);
 954                 release_console_sem();
 955                 if (i)
 956                         return i;
 957                 if (copy_to_user(argp, &var, sizeof(var)))
 958                         return -EFAULT;
 959                 return 0;
 960         case FBIO_CURSOR:
 961                 return -EINVAL;
 962         case FBIOGET_CON2FBMAP:
 963                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
 964                         return -EFAULT;
 965                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
 966                     return -EINVAL;
 967                 con2fb.framebuffer = -1;
 968                 event.info = info;
 969                 event.data = &con2fb;
 970                 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
 971                 return copy_to_user(argp, &con2fb,
 972                                     sizeof(con2fb)) ? -EFAULT : 0;
 973         case FBIOPUT_CON2FBMAP:
 974                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
 975                         return - EFAULT;
 976                 if (con2fb.console < 0 || con2fb.console > MAX_NR_CONSOLES)
 977                     return -EINVAL;
 978                 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
 979                     return -EINVAL;
 980 #ifdef CONFIG_KMOD
 981                 if (!registered_fb[con2fb.framebuffer])
 982                     try_to_load(con2fb.framebuffer);
 983 #endif /* CONFIG_KMOD */
 984                 if (!registered_fb[con2fb.framebuffer])
 985                     return -EINVAL;
 986                 event.info = info;
 987                 event.data = &con2fb;
 988                 return fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP,
 989                                               &event);
 990         case FBIOBLANK:
 991                 acquire_console_sem();
 992                 info->flags |= FBINFO_MISC_USEREVENT;
 993                 i = fb_blank(info, arg);
 994                 info->flags &= ~FBINFO_MISC_USEREVENT;
 995                 release_console_sem();
 996                 return i;
 997         default:
 998                 if (fb->fb_ioctl == NULL)
 999                         return -EINVAL;
1000                 return fb->fb_ioctl(info, cmd, arg);
1001         }
1002 }
1003
1004 #ifdef CONFIG_COMPAT
1005 struct fb_fix_screeninfo32 {
1006         char                    id[16];
1007         compat_caddr_t          smem_start;
1008         u32                     smem_len;
1009         u32                     type;
1010         u32                     type_aux;
1011         u32                     visual;
1012         u16                     xpanstep;
1013         u16                     ypanstep;
1014         u16                     ywrapstep;
1015         u32                     line_length;
1016         compat_caddr_t          mmio_start;
1017         u32                     mmio_len;
1018         u32                     accel;
1019         u16                     reserved[3];
1020 };
1021
1022 struct fb_cmap32 {
1023         u32                     start;
1024         u32                     len;
1025         compat_caddr_t  red;
1026         compat_caddr_t  green;
1027         compat_caddr_t  blue;
1028         compat_caddr_t  transp;
1029 };
1030
1031 static int fb_getput_cmap(struct inode *inode, struct file *file,
1032                         unsigned int cmd, unsigned long arg)
1033 {
1034         struct fb_cmap_user __user *cmap;
1035         struct fb_cmap32 __user *cmap32;
1036         __u32 data;
1037         int err;
1038
1039         cmap = compat_alloc_user_space(sizeof(*cmap));
1040         cmap32 = compat_ptr(arg);
1041
1042         if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1043                 return -EFAULT;
1044
1045         if (get_user(data, &cmap32->red) ||
1046             put_user(compat_ptr(data), &cmap->red) ||
1047             get_user(data, &cmap32->green) ||
1048             put_user(compat_ptr(data), &cmap->green) ||
1049             get_user(data, &cmap32->blue) ||
1050             put_user(compat_ptr(data), &cmap->blue) ||
1051             get_user(data, &cmap32->transp) ||
1052             put_user(compat_ptr(data), &cmap->transp))
1053                 return -EFAULT;
1054
1055         err = fb_ioctl(inode, file, cmd, (unsigned long) cmap);
1056
1057         if (!err) {
1058                 if (copy_in_user(&cmap32->start,
1059                                  &cmap->start,
1060                                  2 * sizeof(__u32)))
1061                         err = -EFAULT;
1062         }
1063         return err;
1064 }
1065
1066 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1067                                   struct fb_fix_screeninfo32 __user *fix32)
1068 {
1069         __u32 data;
1070         int err;
1071
1072         err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1073
1074         data = (__u32) (unsigned long) fix->smem_start;
1075         err |= put_user(data, &fix32->smem_start);
1076
1077         err |= put_user(fix->smem_len, &fix32->smem_len);
1078         err |= put_user(fix->type, &fix32->type);
1079         err |= put_user(fix->type_aux, &fix32->type_aux);
1080         err |= put_user(fix->visual, &fix32->visual);
1081         err |= put_user(fix->xpanstep, &fix32->xpanstep);
1082         err |= put_user(fix->ypanstep, &fix32->ypanstep);
1083         err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1084         err |= put_user(fix->line_length, &fix32->line_length);
1085
1086         data = (__u32) (unsigned long) fix->mmio_start;
1087         err |= put_user(data, &fix32->mmio_start);
1088
1089         err |= put_user(fix->mmio_len, &fix32->mmio_len);
1090         err |= put_user(fix->accel, &fix32->accel);
1091         err |= copy_to_user(fix32->reserved, fix->reserved,
1092                             sizeof(fix->reserved));
1093
1094         return err;
1095 }
1096
1097 static int fb_get_fscreeninfo(struct inode *inode, struct file *file,
1098                                 unsigned int cmd, unsigned long arg)
1099 {
1100         mm_segment_t old_fs;
1101         struct fb_fix_screeninfo fix;
1102         struct fb_fix_screeninfo32 __user *fix32;
1103         int err;
1104
1105         fix32 = compat_ptr(arg);
1106
1107         old_fs = get_fs();
1108         set_fs(KERNEL_DS);
1109         err = fb_ioctl(inode, file, cmd, (unsigned long) &fix);
1110         set_fs(old_fs);
1111
1112         if (!err)
1113                 err = do_fscreeninfo_to_user(&fix, fix32);
1114
1115         return err;
1116 }
1117
1118 static long
1119 fb_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1120 {
1121         struct inode *inode = file->f_path.dentry->d_inode;
1122         int fbidx = iminor(inode);
1123         struct fb_info *info = registered_fb[fbidx];
1124         struct fb_ops *fb = info->fbops;
1125         long ret = -ENOIOCTLCMD;
1126
1127         lock_kernel();
1128         switch(cmd) {
1129         case FBIOGET_VSCREENINFO:
1130         case FBIOPUT_VSCREENINFO:
1131         case FBIOPAN_DISPLAY:
1132         case FBIOGET_CON2FBMAP:
1133         case FBIOPUT_CON2FBMAP:
1134                 arg = (unsigned long) compat_ptr(arg);
1135         case FBIOBLANK:
1136                 ret = fb_ioctl(inode, file, cmd, arg);
1137                 break;
1138
1139         case FBIOGET_FSCREENINFO:
1140                 ret = fb_get_fscreeninfo(inode, file, cmd, arg);
1141                 break;
1142
1143         case FBIOGETCMAP:
1144         case FBIOPUTCMAP:
1145                 ret = fb_getput_cmap(inode, file, cmd, arg);
1146                 break;
1147
1148         default:
1149                 if (fb->fb_compat_ioctl)
1150                         ret = fb->fb_compat_ioctl(info, cmd, arg);
1151                 break;
1152         }
1153         unlock_kernel();
1154         return ret;
1155 }
1156 #endif
1157
1158 static int
1159 fb_mmap(struct file *file, struct vm_area_struct * vma)
1160 {
1161         int fbidx = iminor(file->f_path.dentry->d_inode);
1162         struct fb_info *info = registered_fb[fbidx];
1163         struct fb_ops *fb = info->fbops;
1164         unsigned long off;
1165         unsigned long start;
1166         u32 len;
1167
1168         if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
1169                 return -EINVAL;
1170         off = vma->vm_pgoff << PAGE_SHIFT;
1171         if (!fb)
1172                 return -ENODEV;
1173         if (fb->fb_mmap) {
1174                 int res;
1175                 lock_kernel();
1176                 res = fb->fb_mmap(info, vma);
1177                 unlock_kernel();
1178                 return res;
1179         }
1180
1181         lock_kernel();
1182
1183         /* frame buffer memory */
1184         start = info->fix.smem_start;
1185         len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
1186         if (off >= len) {
1187                 /* memory mapped io */
1188                 off -= len;
1189                 if (info->var.accel_flags) {
1190                         unlock_kernel();
1191                         return -EINVAL;
1192                 }
1193                 start = info->fix.mmio_start;
1194                 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
1195         }
1196         unlock_kernel();
1197         start &= PAGE_MASK;
1198         if ((vma->vm_end - vma->vm_start + off) > len)
1199                 return -EINVAL;
1200         off += start;
1201         vma->vm_pgoff = off >> PAGE_SHIFT;
1202         /* This is an IO map - tell maydump to skip this VMA */
1203         vma->vm_flags |= VM_IO | VM_RESERVED;
1204         fb_pgprotect(file, vma, off);
1205         if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1206                              vma->vm_end - vma->vm_start, vma->vm_page_prot))
1207                 return -EAGAIN;
1208         return 0;
1209 }
1210
1211 static int
1212 fb_open(struct inode *inode, struct file *file)
1213 {
1214         int fbidx = iminor(inode);
1215         struct fb_info *info;
1216         int res = 0;
1217
1218         if (fbidx >= FB_MAX)
1219                 return -ENODEV;
1220 #ifdef CONFIG_KMOD
1221         if (!(info = registered_fb[fbidx]))
1222                 try_to_load(fbidx);
1223 #endif /* CONFIG_KMOD */
1224         if (!(info = registered_fb[fbidx]))
1225                 return -ENODEV;
1226         if (!try_module_get(info->fbops->owner))
1227                 return -ENODEV;
1228         file->private_data = info;
1229         if (info->fbops->fb_open) {
1230                 res = info->fbops->fb_open(info,1);
1231                 if (res)
1232                         module_put(info->fbops->owner);
1233         }
1234         return res;
1235 }
1236
1237 static int
1238 fb_release(struct inode *inode, struct file *file)
1239 {
1240         struct fb_info * const info = file->private_data;
1241
1242         lock_kernel();
1243         if (info->fbops->fb_release)
1244                 info->fbops->fb_release(info,1);
1245         module_put(info->fbops->owner);
1246         unlock_kernel();
1247         return 0;
1248 }
1249
1250 static const struct file_operations fb_fops = {
1251         .owner =        THIS_MODULE,
1252         .read =         fb_read,
1253         .write =        fb_write,
1254         .ioctl =        fb_ioctl,
1255 #ifdef CONFIG_COMPAT
1256         .compat_ioctl = fb_compat_ioctl,
1257 #endif
1258         .mmap =         fb_mmap,
1259         .open =         fb_open,
1260         .release =      fb_release,
1261 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1262         .get_unmapped_area = get_fb_unmapped_area,
1263 #endif
1264 #ifdef CONFIG_FB_DEFERRED_IO
1265         .fsync =        fb_deferred_io_fsync,
1266 #endif
1267 };
1268
1269 struct class *fb_class;
1270 EXPORT_SYMBOL(fb_class);
1271 /**
1272  *      register_framebuffer - registers a frame buffer device
1273  *      @fb_info: frame buffer info structure
1274  *
1275  *      Registers a frame buffer device @fb_info.
1276  *
1277  *      Returns negative errno on error, or zero for success.
1278  *
1279  */
1280
1281 int
1282 register_framebuffer(struct fb_info *fb_info)
1283 {
1284         int i;
1285         struct fb_event event;
1286         struct fb_videomode mode;
1287
1288         if (num_registered_fb == FB_MAX)
1289                 return -ENXIO;
1290         num_registered_fb++;
1291         for (i = 0 ; i < FB_MAX; i++)
1292                 if (!registered_fb[i])
1293                         break;
1294         fb_info->node = i;
1295
1296         fb_info->dev = device_create(fb_class, fb_info->device,
1297                                      MKDEV(FB_MAJOR, i), "fb%d", i);
1298         if (IS_ERR(fb_info->dev)) {
1299                 /* Not fatal */
1300                 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1301                 fb_info->dev = NULL;
1302         } else
1303                 fb_init_device(fb_info);
1304
1305         if (fb_info->pixmap.addr == NULL) {
1306                 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1307                 if (fb_info->pixmap.addr) {
1308                         fb_info->pixmap.size = FBPIXMAPSIZE;
1309                         fb_info->pixmap.buf_align = 1;
1310                         fb_info->pixmap.scan_align = 1;
1311                         fb_info->pixmap.access_align = 32;
1312                         fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1313                 }
1314         }
1315         fb_info->pixmap.offset = 0;
1316
1317         if (!fb_info->pixmap.blit_x)
1318                 fb_info->pixmap.blit_x = ~(u32)0;
1319
1320         if (!fb_info->pixmap.blit_y)
1321                 fb_info->pixmap.blit_y = ~(u32)0;
1322
1323         if (!fb_info->modelist.prev || !fb_info->modelist.next)
1324                 INIT_LIST_HEAD(&fb_info->modelist);
1325
1326         fb_var_to_videomode(&mode, &fb_info->var);
1327         fb_add_videomode(&mode, &fb_info->modelist);
1328         registered_fb[i] = fb_info;
1329
1330         event.info = fb_info;
1331         fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1332         return 0;
1333 }
1334
1335
1336 /**
1337  *      unregister_framebuffer - releases a frame buffer device
1338  *      @fb_info: frame buffer info structure
1339  *
1340  *      Unregisters a frame buffer device @fb_info.
1341  *
1342  *      Returns negative errno on error, or zero for success.
1343  *
1344  *      This function will also notify the framebuffer console
1345  *      to release the driver.
1346  *
1347  *      This is meant to be called within a driver's module_exit()
1348  *      function. If this is called outside module_exit(), ensure
1349  *      that the driver implements fb_open() and fb_release() to
1350  *      check that no processes are using the device.
1351  */
1352
1353 int
1354 unregister_framebuffer(struct fb_info *fb_info)
1355 {
1356         struct fb_event event;
1357         int i, ret = 0;
1358
1359         i = fb_info->node;
1360         if (!registered_fb[i]) {
1361                 ret = -EINVAL;
1362                 goto done;
1363         }
1364
1365         event.info = fb_info;
1366         ret = fb_notifier_call_chain(FB_EVENT_FB_UNBIND, &event);
1367
1368         if (ret) {
1369                 ret = -EINVAL;
1370                 goto done;
1371         }
1372
1373         if (fb_info->pixmap.addr &&
1374             (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1375                 kfree(fb_info->pixmap.addr);
1376         fb_destroy_modelist(&fb_info->modelist);
1377         registered_fb[i]=NULL;
1378         num_registered_fb--;
1379         fb_cleanup_device(fb_info);
1380         device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1381         event.info = fb_info;
1382         fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1383 done:
1384         return ret;
1385 }
1386
1387 /**
1388  *      fb_set_suspend - low level driver signals suspend
1389  *      @info: framebuffer affected
1390  *      @state: 0 = resuming, !=0 = suspending
1391  *
1392  *      This is meant to be used by low level drivers to
1393  *      signal suspend/resume to the core & clients.
1394  *      It must be called with the console semaphore held
1395  */
1396 void fb_set_suspend(struct fb_info *info, int state)
1397 {
1398         struct fb_event event;
1399
1400         event.info = info;
1401         if (state) {
1402                 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event);
1403                 info->state = FBINFO_STATE_SUSPENDED;
1404         } else {
1405                 info->state = FBINFO_STATE_RUNNING;
1406                 fb_notifier_call_chain(FB_EVENT_RESUME, &event);
1407         }
1408 }
1409
1410 /**
1411  *      fbmem_init - init frame buffer subsystem
1412  *
1413  *      Initialize the frame buffer subsystem.
1414  *
1415  *      NOTE: This function is _only_ to be called by drivers/char/mem.c.
1416  *
1417  */
1418
1419 static int __init
1420 fbmem_init(void)
1421 {
1422         create_proc_read_entry("fb", 0, NULL, fbmem_read_proc, NULL);
1423
1424         if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1425                 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1426
1427         fb_class = class_create(THIS_MODULE, "graphics");
1428         if (IS_ERR(fb_class)) {
1429                 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1430                 fb_class = NULL;
1431         }
1432         return 0;
1433 }
1434
1435 #ifdef MODULE
1436 module_init(fbmem_init);
1437 static void __exit
1438 fbmem_exit(void)
1439 {
1440         class_destroy(fb_class);
1441         unregister_chrdev(FB_MAJOR, "fb");
1442 }
1443
1444 module_exit(fbmem_exit);
1445 MODULE_LICENSE("GPL");
1446 MODULE_DESCRIPTION("Framebuffer base");
1447 #else
1448 subsys_initcall(fbmem_init);
1449 #endif
1450
1451 int fb_new_modelist(struct fb_info *info)
1452 {
1453         struct fb_event event;
1454         struct fb_var_screeninfo var = info->var;
1455         struct list_head *pos, *n;
1456         struct fb_modelist *modelist;
1457         struct fb_videomode *m, mode;
1458         int err = 1;
1459
1460         list_for_each_safe(pos, n, &info->modelist) {
1461                 modelist = list_entry(pos, struct fb_modelist, list);
1462                 m = &modelist->mode;
1463                 fb_videomode_to_var(&var, m);
1464                 var.activate = FB_ACTIVATE_TEST;
1465                 err = fb_set_var(info, &var);
1466                 fb_var_to_videomode(&mode, &var);
1467                 if (err || !fb_mode_is_equal(m, &mode)) {
1468                         list_del(pos);
1469                         kfree(pos);
1470                 }
1471         }
1472
1473         err = 1;
1474
1475         if (!list_empty(&info->modelist)) {
1476                 event.info = info;
1477                 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
1478         }
1479
1480         return err;
1481 }
1482
1483 static char *video_options[FB_MAX] __read_mostly;
1484 static int ofonly __read_mostly;
1485
1486 extern const char *global_mode_option;
1487
1488 /**
1489  * fb_get_options - get kernel boot parameters
1490  * @name:   framebuffer name as it would appear in
1491  *          the boot parameter line
1492  *          (video=<name>:<options>)
1493  * @option: the option will be stored here
1494  *
1495  * NOTE: Needed to maintain backwards compatibility
1496  */
1497 int fb_get_options(char *name, char **option)
1498 {
1499         char *opt, *options = NULL;
1500         int opt_len, retval = 0;
1501         int name_len = strlen(name), i;
1502
1503         if (name_len && ofonly && strncmp(name, "offb", 4))
1504                 retval = 1;
1505
1506         if (name_len && !retval) {
1507                 for (i = 0; i < FB_MAX; i++) {
1508                         if (video_options[i] == NULL)
1509                                 continue;
1510                         opt_len = strlen(video_options[i]);
1511                         if (!opt_len)
1512                                 continue;
1513                         opt = video_options[i];
1514                         if (!strncmp(name, opt, name_len) &&
1515                             opt[name_len] == ':')
1516                                 options = opt + name_len + 1;
1517                 }
1518         }
1519         if (options && !strncmp(options, "off", 3))
1520                 retval = 1;
1521
1522         if (option)
1523                 *option = options;
1524
1525         return retval;
1526 }
1527
1528 #ifndef MODULE
1529 /**
1530  *      video_setup - process command line options
1531  *      @options: string of options
1532  *
1533  *      Process command line options for frame buffer subsystem.
1534  *
1535  *      NOTE: This function is a __setup and __init function.
1536  *            It only stores the options.  Drivers have to call
1537  *            fb_get_options() as necessary.
1538  *
1539  *      Returns zero.
1540  *
1541  */
1542 static int __init video_setup(char *options)
1543 {
1544         int i, global = 0;
1545
1546         if (!options || !*options)
1547                 global = 1;
1548
1549         if (!global && !strncmp(options, "ofonly", 6)) {
1550                 ofonly = 1;
1551                 global = 1;
1552         }
1553
1554         if (!global && !strstr(options, "fb:")) {
1555                 global_mode_option = options;
1556                 global = 1;
1557         }
1558
1559         if (!global) {
1560                 for (i = 0; i < FB_MAX; i++) {
1561                         if (video_options[i] == NULL) {
1562                                 video_options[i] = options;
1563                                 break;
1564                         }
1565
1566                 }
1567         }
1568
1569         return 1;
1570 }
1571 __setup("video=", video_setup);
1572 #endif
1573
1574     /*
1575      *  Visible symbols for modules
1576      */
1577
1578 EXPORT_SYMBOL(register_framebuffer);
1579 EXPORT_SYMBOL(unregister_framebuffer);
1580 EXPORT_SYMBOL(num_registered_fb);
1581 EXPORT_SYMBOL(registered_fb);
1582 EXPORT_SYMBOL(fb_prepare_logo);
1583 EXPORT_SYMBOL(fb_show_logo);
1584 EXPORT_SYMBOL(fb_set_var);
1585 EXPORT_SYMBOL(fb_blank);
1586 EXPORT_SYMBOL(fb_pan_display);
1587 EXPORT_SYMBOL(fb_get_buffer_offset);
1588 EXPORT_SYMBOL(fb_set_suspend);
1589 EXPORT_SYMBOL(fb_get_options);
1590
1591 MODULE_LICENSE("GPL");