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
  37 #if defined(__mc68000__) || defined(CONFIG_APUS)
  38 #include <asm/setup.h>
  39 #endif
  40
  41 #include <asm/io.h>
  42 #include <asm/uaccess.h>
  43 #include <asm/page.h>
  44 #include <asm/pgtable.h>
  45
  46 #include <linux/fb.h>
  47
  48     /*
  49      *  Frame buffer device initialization and setup routines
  50      */
  51
  52 #define FBPIXMAPSIZE    (1024 * 8)
  53
  54 struct fb_info *registered_fb[FB_MAX] __read_mostly;
  55 int num_registered_fb __read_mostly;
  56
  57 /*
  58  * Helpers
  59  */
  60
  61 int fb_get_color_depth(struct fb_var_screeninfo *var,
  62                        struct fb_fix_screeninfo *fix)
  63 {
  64         int depth = 0;
  65
  66         if (fix->visual == FB_VISUAL_MONO01 ||
  67             fix->visual == FB_VISUAL_MONO10)
  68                 depth = 1;
  69         else {
  70                 if (var->green.length == var->blue.length &&
  71                     var->green.length == var->red.length &&
  72                     var->green.offset == var->blue.offset &&
  73                     var->green.offset == var->red.offset)
  74                         depth = var->green.length;
  75                 else
  76                         depth = var->green.length + var->red.length +
  77                                 var->blue.length;
  78         }
  79
  80         return depth;
  81 }
  82 EXPORT_SYMBOL(fb_get_color_depth);
  83
  84 /*
  85  * Data padding functions.
  86  */
  87 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
  88 {
  89         __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
  90 }
  91 EXPORT_SYMBOL(fb_pad_aligned_buffer);
  92
  93 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
  94                                 u32 shift_high, u32 shift_low, u32 mod)
  95 {
  96         u8 mask = (u8) (0xfff << shift_high), tmp;
  97         int i, j;
  98
  99         for (i = height; i--; ) {
 100                 for (j = 0; j < idx; j++) {
 101                         tmp = dst[j];
 102                         tmp &= mask;
 103                         tmp |= *src >> shift_low;
 104                         dst[j] = tmp;
 105                         tmp = *src << shift_high;
 106                         dst[j+1] = tmp;
 107                         src++;
 108                 }
 109                 tmp = dst[idx];
 110                 tmp &= mask;
 111                 tmp |= *src >> shift_low;
 112                 dst[idx] = tmp;
 113                 if (shift_high < mod) {
 114                         tmp = *src << shift_high;
 115                         dst[idx+1] = tmp;
 116                 }
 117                 src++;
 118                 dst += d_pitch;
 119         }
 120 }
 121 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
 122
 123 /*
 124  * we need to lock this section since fb_cursor
 125  * may use fb_imageblit()
 126  */
 127 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
 128 {
 129         u32 align = buf->buf_align - 1, offset;
 130         char *addr = buf->addr;
 131
 132         /* If IO mapped, we need to sync before access, no sharing of
 133          * the pixmap is done
 134          */
 135         if (buf->flags & FB_PIXMAP_IO) {
 136                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 137                         info->fbops->fb_sync(info);
 138                 return addr;
 139         }
 140
 141         /* See if we fit in the remaining pixmap space */
 142         offset = buf->offset + align;
 143         offset &= ~align;
 144         if (offset + size > buf->size) {
 145                 /* We do not fit. In order to be able to re-use the buffer,
 146                  * we must ensure no asynchronous DMA'ing or whatever operation
 147                  * is in progress, we sync for that.
 148                  */
 149                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 150                         info->fbops->fb_sync(info);
 151                 offset = 0;
 152         }
 153         buf->offset = offset + size;
 154         addr += offset;
 155
 156         return addr;
 157 }
 158
 159 #ifdef CONFIG_LOGO
 160
 161 static inline unsigned safe_shift(unsigned d, int n)
 162 {
 163         return n < 0 ? d >> -n : d << n;
 164 }
 165
 166 static void fb_set_logocmap(struct fb_info *info,
 167                                    const struct linux_logo *logo)
 168 {
 169         struct fb_cmap palette_cmap;
 170         u16 palette_green[16];
 171         u16 palette_blue[16];
 172         u16 palette_red[16];
 173         int i, j, n;
 174         const unsigned char *clut = logo->clut;
 175
 176         palette_cmap.start = 0;
 177         palette_cmap.len = 16;
 178         palette_cmap.red = palette_red;
 179         palette_cmap.green = palette_green;
 180         palette_cmap.blue = palette_blue;
 181         palette_cmap.transp = NULL;
 182
 183         for (i = 0; i < logo->clutsize; i += n) {
 184                 n = logo->clutsize - i;
 185                 /* palette_cmap provides space for only 16 colors at once */
 186                 if (n > 16)
 187                         n = 16;
 188                 palette_cmap.start = 32 + i;
 189                 palette_cmap.len = n;
 190                 for (j = 0; j < n; ++j) {
 191                         palette_cmap.red[j] = clut[0] << 8 | clut[0];
 192                         palette_cmap.green[j] = clut[1] << 8 | clut[1];
 193                         palette_cmap.blue[j] = clut[2] << 8 | clut[2];
 194                         clut += 3;
 195                 }
 196                 fb_set_cmap(&palette_cmap, info);
 197         }
 198 }
 199
 200 static void  fb_set_logo_truepalette(struct fb_info *info,
 201                                             const struct linux_logo *logo,
 202                                             u32 *palette)
 203 {
 204         static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
 205         unsigned char redmask, greenmask, bluemask;
 206         int redshift, greenshift, blueshift;
 207         int i;
 208         const unsigned char *clut = logo->clut;
 209
 210         /*
 211          * We have to create a temporary palette since console palette is only
 212          * 16 colors long.
 213          */
 214         /* Bug: Doesn't obey msb_right ... (who needs that?) */
 215         redmask   = mask[info->var.red.length   < 8 ? info->var.red.length   : 8];
 216         greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
 217         bluemask  = mask[info->var.blue.length  < 8 ? info->var.blue.length  : 8];
 218         redshift   = info->var.red.offset   - (8 - info->var.red.length);
 219         greenshift = info->var.green.offset - (8 - info->var.green.length);
 220         blueshift  = info->var.blue.offset  - (8 - info->var.blue.length);
 221
 222         for ( i = 0; i < logo->clutsize; i++) {
 223                 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
 224                                  safe_shift((clut[1] & greenmask), greenshift) |
 225                                  safe_shift((clut[2] & bluemask), blueshift));
 226                 clut += 3;
 227         }
 228 }
 229
 230 static void fb_set_logo_directpalette(struct fb_info *info,
 231                                              const struct linux_logo *logo,
 232                                              u32 *palette)
 233 {
 234         int redshift, greenshift, blueshift;
 235         int i;
 236
 237         redshift = info->var.red.offset;
 238         greenshift = info->var.green.offset;
 239         blueshift = info->var.blue.offset;
 240
 241         for (i = 32; i < logo->clutsize; i++)
 242                 palette[i] = i << redshift | i << greenshift | i << blueshift;
 243 }
 244
 245 static void fb_set_logo(struct fb_info *info,
 246                                const struct linux_logo *logo, u8 *dst,
 247                                int depth)
 248 {
 249         int i, j, k;
 250         const u8 *src = logo->data;
 251         u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
 252         u8 fg = 1, d;
 253
 254         if (fb_get_color_depth(&info->var, &info->fix) == 3)
 255                 fg = 7;
 256
 257         if (info->fix.visual == FB_VISUAL_MONO01 ||
 258             info->fix.visual == FB_VISUAL_MONO10)
 259                 fg = ~((u8) (0xfff << info->var.green.length));
 260
 261         switch (depth) {
 262         case 4:
 263                 for (i = 0; i < logo->height; i++)
 264                         for (j = 0; j < logo->width; src++) {
 265                                 *dst++ = *src >> 4;
 266                                 j++;
 267                                 if (j < logo->width) {
 268                                         *dst++ = *src & 0x0f;
 269                                         j++;
 270                                 }
 271                         }
 272                 break;
 273         case 1:
 274                 for (i = 0; i < logo->height; i++) {
 275                         for (j = 0; j < logo->width; src++) {
 276                                 d = *src ^ xor;
 277                                 for (k = 7; k >= 0; k--) {
 278                                         *dst++ = ((d >> k) & 1) ? fg : 0;
 279                                         j++;
 280                                 }
 281                         }
 282                 }
 283                 break;
 284         }
 285 }
 286
 287 /*
 288  * Three (3) kinds of logo maps exist.  linux_logo_clut224 (>16 colors),
 289  * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors).  Depending on
 290  * the visual format and color depth of the framebuffer, the DAC, the
 291  * pseudo_palette, and the logo data will be adjusted accordingly.
 292  *
 293  * Case 1 - linux_logo_clut224:
 294  * Color exceeds the number of console colors (16), thus we set the hardware DAC
 295  * using fb_set_cmap() appropriately.  The "needs_cmapreset"  flag will be set.
 296  *
 297  * For visuals that require color info from the pseudo_palette, we also construct
 298  * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
 299  * will be set.
 300  *
 301  * Case 2 - linux_logo_vga16:
 302  * The number of colors just matches the console colors, thus there is no need
 303  * to set the DAC or the pseudo_palette.  However, the bitmap is packed, ie,
 304  * each byte contains color information for two pixels (upper and lower nibble).
 305  * To be consistent with fb_imageblit() usage, we therefore separate the two
 306  * nibbles into separate bytes. The "depth" flag will be set to 4.
 307  *
 308  * Case 3 - linux_logo_mono:
 309  * This is similar with Case 2.  Each byte contains information for 8 pixels.
 310  * We isolate each bit and expand each into a byte. The "depth" flag will
 311  * be set to 1.
 312  */
 313 static struct logo_data {
 314         int depth;
 315         int needs_directpalette;
 316         int needs_truepalette;
 317         int needs_cmapreset;
 318         const struct linux_logo *logo;
 319 } fb_logo __read_mostly;
 320
 321 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
 322 {
 323         u32 size = width * height, i;
 324
 325         out += size - 1;
 326
 327         for (i = size; i--; )
 328                 *out-- = *in++;
 329 }
 330
 331 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
 332 {
 333         int i, j, h = height - 1;
 334
 335         for (i = 0; i < height; i++)
 336                 for (j = 0; j < width; j++)
 337                                 out[height * j + h - i] = *in++;
 338 }
 339
 340 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
 341 {
 342         int i, j, w = width - 1;
 343
 344         for (i = 0; i < height; i++)
 345                 for (j = 0; j < width; j++)
 346                         out[height * (w - j) + i] = *in++;
 347 }
 348
 349 static void fb_rotate_logo(struct fb_info *info, u8 *dst,
 350                            struct fb_image *image, int rotate)
 351 {
 352         u32 tmp;
 353
 354         if (rotate == FB_ROTATE_UD) {
 355                 fb_rotate_logo_ud(image->data, dst, image->width,
 356                                   image->height);
 357                 image->dx = info->var.xres - image->width;
 358                 image->dy = info->var.yres - image->height;
 359         } else if (rotate == FB_ROTATE_CW) {
 360                 fb_rotate_logo_cw(image->data, dst, image->width,
 361                                   image->height);
 362                 tmp = image->width;
 363                 image->width = image->height;
 364                 image->height = tmp;
 365                 image->dx = info->var.xres - image->width;
 366         } else if (rotate == FB_ROTATE_CCW) {
 367                 fb_rotate_logo_ccw(image->data, dst, image->width,
 368                                    image->height);
 369                 tmp = image->width;
 370                 image->width = image->height;
 371                 image->height = tmp;
 372                 image->dy = info->var.yres - image->height;
 373         }
 374
 375         image->data = dst;
 376 }
 377
 378 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
 379                             int rotate, unsigned int num)
 380 {
 381         unsigned int x;
 382
 383         if (rotate == FB_ROTATE_UR) {
 384                 for (x = 0;
 385                      x < num && image->dx + image->width <= info->var.xres;
 386                      x++) {
 387                         info->fbops->fb_imageblit(info, image);
 388                         image->dx += image->width + 8;
 389                 }
 390         } else if (rotate == FB_ROTATE_UD) {
 391                 for (x = 0; x < num && image->dx >= 0; x++) {
 392                         info->fbops->fb_imageblit(info, image);
 393                         image->dx -= image->width + 8;
 394                 }
 395         } else if (rotate == FB_ROTATE_CW) {
 396                 for (x = 0;
 397                      x < num && image->dy + image->height <= info->var.yres;
 398                      x++) {
 399                         info->fbops->fb_imageblit(info, image);
 400                         image->dy += image->height + 8;
 401                 }
 402         } else if (rotate == FB_ROTATE_CCW) {
 403                 for (x = 0; x < num && image->dy >= 0; x++) {
 404                         info->fbops->fb_imageblit(info, image);
 405                         image->dy -= image->height + 8;
 406                 }
 407         }
 408 }
 409
 410 int fb_prepare_logo(struct fb_info *info, int rotate)
 411 {
 412         int depth = fb_get_color_depth(&info->var, &info->fix);
 413         int yres;
 414
 415         memset(&fb_logo, 0, sizeof(struct logo_data));
 416
 417         if (info->flags & FBINFO_MISC_TILEBLITTING)
 418                 return 0;
 419
 420         if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
 421                 depth = info->var.blue.length;
 422                 if (info->var.red.length < depth)
 423                         depth = info->var.red.length;
 424                 if (info->var.green.length < depth)
 425                         depth = info->var.green.length;
 426         }
 427
 428         if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) {
 429                 /* assume console colormap */
 430                 depth = 4;
 431         }
 432
 433         if (depth >= 8) {
 434                 switch (info->fix.visual) {
 435                 case FB_VISUAL_TRUECOLOR:
 436                         fb_logo.needs_truepalette = 1;
 437                         break;
 438                 case FB_VISUAL_DIRECTCOLOR:
 439                         fb_logo.needs_directpalette = 1;
 440                         fb_logo.needs_cmapreset = 1;
 441                         break;
 442                 case FB_VISUAL_PSEUDOCOLOR:
 443                         fb_logo.needs_cmapreset = 1;
 444                         break;
 445                 }
 446         }
 447
 448         /* Return if no suitable logo was found */
 449         fb_logo.logo = fb_find_logo(depth);
 450
 451         if (!fb_logo.logo) {
 452                 return 0;
 453         }
 454
 455         if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
 456                 yres = info->var.yres;
 457         else
 458                 yres = info->var.xres;
 459
 460         if (fb_logo.logo->height > yres) {
 461                 fb_logo.logo = NULL;
 462                 return 0;
 463         }
 464
 465         /* What depth we asked for might be different from what we get */
 466         if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
 467                 fb_logo.depth = 8;
 468         else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
 469                 fb_logo.depth = 4;
 470         else
 471                 fb_logo.depth = 1;
 472         return fb_logo.logo->height;
 473 }
 474
 475 int fb_show_logo(struct fb_info *info, int rotate)
 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 (fb_logo.logo == NULL || info->state != FBINFO_STATE_RUNNING)
 483                 return 0;
 484
 485         image.depth = 8;
 486         image.data = fb_logo.logo->data;
 487
 488         if (fb_logo.needs_cmapreset)
 489                 fb_set_logocmap(info, fb_logo.logo);
 490
 491         if (fb_logo.needs_truepalette ||
 492             fb_logo.needs_directpalette) {
 493                 palette = kmalloc(256 * 4, GFP_KERNEL);
 494                 if (palette == NULL)
 495                         return 0;
 496
 497                 if (fb_logo.needs_truepalette)
 498                         fb_set_logo_truepalette(info, fb_logo.logo, palette);
 499                 else
 500                         fb_set_logo_directpalette(info, fb_logo.logo, palette);
 501
 502                 saved_pseudo_palette = info->pseudo_palette;
 503                 info->pseudo_palette = palette;
 504         }
 505
 506         if (fb_logo.depth <= 4) {
 507                 logo_new = kmalloc(fb_logo.logo->width * fb_logo.logo->height,
 508                                    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, fb_logo.logo, logo_new, fb_logo.depth);
 517         }
 518
 519         image.dx = 0;
 520         image.dy = 0;
 521         image.width = fb_logo.logo->width;
 522         image.height = fb_logo.logo->height;
 523
 524         if (rotate) {
 525                 logo_rotate = kmalloc(fb_logo.logo->width *
 526                                       fb_logo.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, num_online_cpus());
 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 fb_logo.logo->height;
 539 }
 540 #else
 541 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
 542 int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
 543 #endif /* CONFIG_LOGO */
 544
 545 static int fbmem_read_proc(char *buf, char **start, off_t offset,
 546                            int len, int *eof, void *private)
 547 {
 548         struct fb_info **fi;
 549         int clen;
 550
 551         clen = 0;
 552         for (fi = registered_fb; fi < &registered_fb[FB_MAX] && clen < 4000;
 553              fi++)
 554                 if (*fi)
 555                         clen += sprintf(buf + clen, "%d %s\n",
 556                                         (*fi)->node,
 557                                         (*fi)->fix.id);
 558         *start = buf + offset;
 559         if (clen > offset)
 560                 clen -= offset;
 561         else
 562                 clen = 0;
 563         return clen < len ? clen : len;
 564 }
 565
 566 static ssize_t
 567 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 568 {
 569         unsigned long p = *ppos;
 570         struct inode *inode = file->f_path.dentry->d_inode;
 571         int fbidx = iminor(inode);
 572         struct fb_info *info = registered_fb[fbidx];
 573         u32 *buffer, *dst;
 574         u32 __iomem *src;
 575         int c, i, cnt = 0, err = 0;
 576         unsigned long total_size;
 577
 578         if (!info || ! info->screen_base)
 579                 return -ENODEV;
 580
 581         if (info->state != FBINFO_STATE_RUNNING)
 582                 return -EPERM;
 583
 584         if (info->fbops->fb_read)
 585                 return info->fbops->fb_read(file, buf, count, ppos);
 586
 587         total_size = info->screen_size;
 588
 589         if (total_size == 0)
 590                 total_size = info->fix.smem_len;
 591
 592         if (p >= total_size)
 593                 return 0;
 594
 595         if (count >= total_size)
 596                 count = total_size;
 597
 598         if (count + p > total_size)
 599                 count = total_size - p;
 600
 601         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 602                          GFP_KERNEL);
 603         if (!buffer)
 604                 return -ENOMEM;
 605
 606         src = (u32 __iomem *) (info->screen_base + p);
 607
 608         if (info->fbops->fb_sync)
 609                 info->fbops->fb_sync(info);
 610
 611         while (count) {
 612                 c  = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 613                 dst = buffer;
 614                 for (i = c >> 2; i--; )
 615                         *dst++ = fb_readl(src++);
 616                 if (c & 3) {
 617                         u8 *dst8 = (u8 *) dst;
 618                         u8 __iomem *src8 = (u8 __iomem *) src;
 619
 620                         for (i = c & 3; i--;)
 621                                 *dst8++ = fb_readb(src8++);
 622
 623                         src = (u32 __iomem *) src8;
 624                 }
 625
 626                 if (copy_to_user(buf, buffer, c)) {
 627                         err = -EFAULT;
 628                         break;
 629                 }
 630                 *ppos += c;
 631                 buf += c;
 632                 cnt += c;
 633                 count -= c;
 634         }
 635
 636         kfree(buffer);
 637
 638         return (err) ? err : cnt;
 639 }
 640
 641 static ssize_t
 642 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 643 {
 644         unsigned long p = *ppos;
 645         struct inode *inode = file->f_path.dentry->d_inode;
 646         int fbidx = iminor(inode);
 647         struct fb_info *info = registered_fb[fbidx];
 648         u32 *buffer, *src;
 649         u32 __iomem *dst;
 650         int c, i, cnt = 0, err = 0;
 651         unsigned long total_size;
 652
 653         if (!info || !info->screen_base)
 654                 return -ENODEV;
 655
 656         if (info->state != FBINFO_STATE_RUNNING)
 657                 return -EPERM;
 658
 659         if (info->fbops->fb_write)
 660                 return info->fbops->fb_write(file, buf, count, ppos);
 661
 662         total_size = info->screen_size;
 663
 664         if (total_size == 0)
 665                 total_size = info->fix.smem_len;
 666
 667         if (p > total_size)
 668                 return -EFBIG;
 669
 670         if (count > total_size) {
 671                 err = -EFBIG;
 672                 count = total_size;
 673         }
 674
 675         if (count + p > total_size) {
 676                 if (!err)
 677                         err = -ENOSPC;
 678
 679                 count = total_size - p;
 680         }
 681
 682         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 683                          GFP_KERNEL);
 684         if (!buffer)
 685                 return -ENOMEM;
 686
 687         dst = (u32 __iomem *) (info->screen_base + p);
 688
 689         if (info->fbops->fb_sync)
 690                 info->fbops->fb_sync(info);
 691
 692         while (count) {
 693                 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 694                 src = buffer;
 695
 696                 if (copy_from_user(src, buf, c)) {
 697                         err = -EFAULT;
 698                         break;
 699                 }
 700
 701                 for (i = c >> 2; i--; )
 702                         fb_writel(*src++, dst++);
 703
 704                 if (c & 3) {
 705                         u8 *src8 = (u8 *) src;
 706                         u8 __iomem *dst8 = (u8 __iomem *) dst;
 707
 708                         for (i = c & 3; i--; )
 709                                 fb_writeb(*src8++, dst8++);
 710
 711                         dst = (u32 __iomem *) dst8;
 712                 }
 713
 714                 *ppos += c;
 715                 buf += c;
 716                 cnt += c;
 717                 count -= c;
 718         }
 719
 720         kfree(buffer);
 721
 722         return (cnt) ? cnt : err;
 723 }
 724
 725 #ifdef CONFIG_KMOD
 726 static void try_to_load(int fb)
 727 {
 728         request_module("fb%d", fb);
 729 }
 730 #endif /* CONFIG_KMOD */
 731
 732 int
 733 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
 734 {
 735         struct fb_fix_screeninfo *fix = &info->fix;
 736         int xoffset = var->xoffset;
 737         int yoffset = var->yoffset;
 738         int err = 0, yres = info->var.yres;
 739
 740         if (var->yoffset > 0) {
 741                 if (var->vmode & FB_VMODE_YWRAP) {
 742                         if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
 743                                 err = -EINVAL;
 744                         else
 745                                 yres = 0;
 746                 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
 747                         err = -EINVAL;
 748         }
 749
 750         if (var->xoffset > 0 && (!fix->xpanstep ||
 751                                  (var->xoffset % fix->xpanstep)))
 752                 err = -EINVAL;
 753
 754         if (err || !info->fbops->fb_pan_display || xoffset < 0 ||
 755             yoffset < 0 || var->yoffset + yres > info->var.yres_virtual ||
 756             var->xoffset + info->var.xres > info->var.xres_virtual)
 757                 return -EINVAL;
 758
 759         if ((err = info->fbops->fb_pan_display(var, info)))
 760                 return err;
 761         info->var.xoffset = var->xoffset;
 762         info->var.yoffset = var->yoffset;
 763         if (var->vmode & FB_VMODE_YWRAP)
 764                 info->var.vmode |= FB_VMODE_YWRAP;
 765         else
 766                 info->var.vmode &= ~FB_VMODE_YWRAP;
 767         return 0;
 768 }
 769
 770 int
 771 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
 772 {
 773         int err, flags = info->flags;
 774
 775         if (var->activate & FB_ACTIVATE_INV_MODE) {
 776                 struct fb_videomode mode1, mode2;
 777                 int ret = 0;
 778
 779                 fb_var_to_videomode(&mode1, var);
 780                 fb_var_to_videomode(&mode2, &info->var);
 781                 /* make sure we don't delete the videomode of current var */
 782                 ret = fb_mode_is_equal(&mode1, &mode2);
 783
 784                 if (!ret) {
 785                     struct fb_event event;
 786
 787                     event.info = info;
 788                     event.data = &mode1;
 789                     ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event);
 790                 }
 791
 792                 if (!ret)
 793                     fb_delete_videomode(&mode1, &info->modelist);
 794
 795                 return ret;
 796         }
 797
 798         if ((var->activate & FB_ACTIVATE_FORCE) ||
 799             memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
 800                 if (!info->fbops->fb_check_var) {
 801                         *var = info->var;
 802                         return 0;
 803                 }
 804
 805                 if ((err = info->fbops->fb_check_var(var, info)))
 806                         return err;
 807
 808                 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
 809                         struct fb_videomode mode;
 810                         int err = 0;
 811
 812                         info->var = *var;
 813                         if (info->fbops->fb_set_par)
 814                                 info->fbops->fb_set_par(info);
 815
 816                         fb_pan_display(info, &info->var);
 817
 818                         fb_set_cmap(&info->cmap, info);
 819
 820                         fb_var_to_videomode(&mode, &info->var);
 821
 822                         if (info->modelist.prev && info->modelist.next &&
 823                             !list_empty(&info->modelist))
 824                                 err = fb_add_videomode(&mode, &info->modelist);
 825
 826                         if (!err && (flags & FBINFO_MISC_USEREVENT)) {
 827                                 struct fb_event event;
 828                                 int evnt = (var->activate & FB_ACTIVATE_ALL) ?
 829                                         FB_EVENT_MODE_CHANGE_ALL :
 830                                         FB_EVENT_MODE_CHANGE;
 831
 832                                 info->flags &= ~FBINFO_MISC_USEREVENT;
 833                                 event.info = info;
 834                                 fb_notifier_call_chain(evnt, &event);
 835                         }
 836                 }
 837         }
 838         return 0;
 839 }
 840
 841 int
 842 fb_blank(struct fb_info *info, int blank)
 843 {
 844         int ret = -EINVAL;
 845
 846         if (blank > FB_BLANK_POWERDOWN)
 847                 blank = FB_BLANK_POWERDOWN;
 848
 849         if (info->fbops->fb_blank)
 850                 ret = info->fbops->fb_blank(blank, info);
 851
 852         if (!ret) {
 853                 struct fb_event event;
 854
 855                 event.info = info;
 856                 event.data = &blank;
 857                 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
 858         }
 859
 860         return ret;
 861 }
 862
 863 static int
 864 fb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
 865          unsigned long arg)
 866 {
 867         int fbidx = iminor(inode);
 868         struct fb_info *info = registered_fb[fbidx];
 869         struct fb_ops *fb = info->fbops;
 870         struct fb_var_screeninfo var;
 871         struct fb_fix_screeninfo fix;
 872         struct fb_con2fbmap con2fb;
 873         struct fb_cmap_user cmap;
 874         struct fb_event event;
 875         void __user *argp = (void __user *)arg;
 876         int i;
 877
 878         if (!fb)
 879                 return -ENODEV;
 880         switch (cmd) {
 881         case FBIOGET_VSCREENINFO:
 882                 return copy_to_user(argp, &info->var,
 883                                     sizeof(var)) ? -EFAULT : 0;
 884         case FBIOPUT_VSCREENINFO:
 885                 if (copy_from_user(&var, argp, sizeof(var)))
 886                         return -EFAULT;
 887                 acquire_console_sem();
 888                 info->flags |= FBINFO_MISC_USEREVENT;
 889                 i = fb_set_var(info, &var);
 890                 info->flags &= ~FBINFO_MISC_USEREVENT;
 891                 release_console_sem();
 892                 if (i) return i;
 893                 if (copy_to_user(argp, &var, sizeof(var)))
 894                         return -EFAULT;
 895                 return 0;
 896         case FBIOGET_FSCREENINFO:
 897                 return copy_to_user(argp, &info->fix,
 898                                     sizeof(fix)) ? -EFAULT : 0;
 899         case FBIOPUTCMAP:
 900                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
 901                         return -EFAULT;
 902                 return (fb_set_user_cmap(&cmap, info));
 903         case FBIOGETCMAP:
 904                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
 905                         return -EFAULT;
 906                 return fb_cmap_to_user(&info->cmap, &cmap);
 907         case FBIOPAN_DISPLAY:
 908                 if (copy_from_user(&var, argp, sizeof(var)))
 909                         return -EFAULT;
 910                 acquire_console_sem();
 911                 i = fb_pan_display(info, &var);
 912                 release_console_sem();
 913                 if (i)
 914                         return i;
 915                 if (copy_to_user(argp, &var, sizeof(var)))
 916                         return -EFAULT;
 917                 return 0;
 918         case FBIO_CURSOR:
 919                 return -EINVAL;
 920         case FBIOGET_CON2FBMAP:
 921                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
 922                         return -EFAULT;
 923                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
 924                     return -EINVAL;
 925                 con2fb.framebuffer = -1;
 926                 event.info = info;
 927                 event.data = &con2fb;
 928                 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
 929                 return copy_to_user(argp, &con2fb,
 930                                     sizeof(con2fb)) ? -EFAULT : 0;
 931         case FBIOPUT_CON2FBMAP:
 932                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
 933                         return - EFAULT;
 934                 if (con2fb.console < 0 || con2fb.console > MAX_NR_CONSOLES)
 935                     return -EINVAL;
 936                 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
 937                     return -EINVAL;
 938 #ifdef CONFIG_KMOD
 939                 if (!registered_fb[con2fb.framebuffer])
 940                     try_to_load(con2fb.framebuffer);
 941 #endif /* CONFIG_KMOD */
 942                 if (!registered_fb[con2fb.framebuffer])
 943                     return -EINVAL;
 944                 event.info = info;
 945                 event.data = &con2fb;
 946                 return fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP,
 947                                               &event);
 948         case FBIOBLANK:
 949                 acquire_console_sem();
 950                 info->flags |= FBINFO_MISC_USEREVENT;
 951                 i = fb_blank(info, arg);
 952                 info->flags &= ~FBINFO_MISC_USEREVENT;
 953                 release_console_sem();
 954                 return i;
 955         default:
 956                 if (fb->fb_ioctl == NULL)
 957                         return -EINVAL;
 958                 return fb->fb_ioctl(info, cmd, arg);
 959         }
 960 }
 961
 962 #ifdef CONFIG_COMPAT
 963 struct fb_fix_screeninfo32 {
 964         char                    id[16];
 965         compat_caddr_t          smem_start;
 966         u32                     smem_len;
 967         u32                     type;
 968         u32                     type_aux;
 969         u32                     visual;
 970         u16                     xpanstep;
 971         u16                     ypanstep;
 972         u16                     ywrapstep;
 973         u32                     line_length;
 974         compat_caddr_t          mmio_start;
 975         u32                     mmio_len;
 976         u32                     accel;
 977         u16                     reserved[3];
 978 };
 979
 980 struct fb_cmap32 {
 981         u32                     start;
 982         u32                     len;
 983         compat_caddr_t  red;
 984         compat_caddr_t  green;
 985         compat_caddr_t  blue;
 986         compat_caddr_t  transp;
 987 };
 988
 989 static int fb_getput_cmap(struct inode *inode, struct file *file,
 990                         unsigned int cmd, unsigned long arg)
 991 {
 992         struct fb_cmap_user __user *cmap;
 993         struct fb_cmap32 __user *cmap32;
 994         __u32 data;
 995         int err;
 996
 997         cmap = compat_alloc_user_space(sizeof(*cmap));
 998         cmap32 = compat_ptr(arg);
 999
1000         if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1001                 return -EFAULT;
1002
1003         if (get_user(data, &cmap32->red) ||
1004             put_user(compat_ptr(data), &cmap->red) ||
1005             get_user(data, &cmap32->green) ||
1006             put_user(compat_ptr(data), &cmap->green) ||
1007             get_user(data, &cmap32->blue) ||
1008             put_user(compat_ptr(data), &cmap->blue) ||
1009             get_user(data, &cmap32->transp) ||
1010             put_user(compat_ptr(data), &cmap->transp))
1011                 return -EFAULT;
1012
1013         err = fb_ioctl(inode, file, cmd, (unsigned long) cmap);
1014
1015         if (!err) {
1016                 if (copy_in_user(&cmap32->start,
1017                                  &cmap->start,
1018                                  2 * sizeof(__u32)))
1019                         err = -EFAULT;
1020         }
1021         return err;
1022 }
1023
1024 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1025                                   struct fb_fix_screeninfo32 __user *fix32)
1026 {
1027         __u32 data;
1028         int err;
1029
1030         err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1031
1032         data = (__u32) (unsigned long) fix->smem_start;
1033         err |= put_user(data, &fix32->smem_start);
1034
1035         err |= put_user(fix->smem_len, &fix32->smem_len);
1036         err |= put_user(fix->type, &fix32->type);
1037         err |= put_user(fix->type_aux, &fix32->type_aux);
1038         err |= put_user(fix->visual, &fix32->visual);
1039         err |= put_user(fix->xpanstep, &fix32->xpanstep);
1040         err |= put_user(fix->ypanstep, &fix32->ypanstep);
1041         err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1042         err |= put_user(fix->line_length, &fix32->line_length);
1043
1044         data = (__u32) (unsigned long) fix->mmio_start;
1045         err |= put_user(data, &fix32->mmio_start);
1046
1047         err |= put_user(fix->mmio_len, &fix32->mmio_len);
1048         err |= put_user(fix->accel, &fix32->accel);
1049         err |= copy_to_user(fix32->reserved, fix->reserved,
1050                             sizeof(fix->reserved));
1051
1052         return err;
1053 }
1054
1055 static int fb_get_fscreeninfo(struct inode *inode, struct file *file,
1056                                 unsigned int cmd, unsigned long arg)
1057 {
1058         mm_segment_t old_fs;
1059         struct fb_fix_screeninfo fix;
1060         struct fb_fix_screeninfo32 __user *fix32;
1061         int err;
1062
1063         fix32 = compat_ptr(arg);
1064
1065         old_fs = get_fs();
1066         set_fs(KERNEL_DS);
1067         err = fb_ioctl(inode, file, cmd, (unsigned long) &fix);
1068         set_fs(old_fs);
1069
1070         if (!err)
1071                 err = do_fscreeninfo_to_user(&fix, fix32);
1072
1073         return err;
1074 }
1075
1076 static long
1077 fb_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1078 {
1079         struct inode *inode = file->f_path.dentry->d_inode;
1080         int fbidx = iminor(inode);
1081         struct fb_info *info = registered_fb[fbidx];
1082         struct fb_ops *fb = info->fbops;
1083         long ret = -ENOIOCTLCMD;
1084
1085         lock_kernel();
1086         switch(cmd) {
1087         case FBIOGET_VSCREENINFO:
1088         case FBIOPUT_VSCREENINFO:
1089         case FBIOPAN_DISPLAY:
1090         case FBIOGET_CON2FBMAP:
1091         case FBIOPUT_CON2FBMAP:
1092                 arg = (unsigned long) compat_ptr(arg);
1093         case FBIOBLANK:
1094                 ret = fb_ioctl(inode, file, cmd, arg);
1095                 break;
1096
1097         case FBIOGET_FSCREENINFO:
1098                 ret = fb_get_fscreeninfo(inode, file, cmd, arg);
1099                 break;
1100
1101         case FBIOGETCMAP:
1102         case FBIOPUTCMAP:
1103                 ret = fb_getput_cmap(inode, file, cmd, arg);
1104                 break;
1105
1106         default:
1107                 if (fb->fb_compat_ioctl)
1108                         ret = fb->fb_compat_ioctl(info, cmd, arg);
1109                 break;
1110         }
1111         unlock_kernel();
1112         return ret;
1113 }
1114 #endif
1115
1116 static int
1117 fb_mmap(struct file *file, struct vm_area_struct * vma)
1118 {
1119         int fbidx = iminor(file->f_path.dentry->d_inode);
1120         struct fb_info *info = registered_fb[fbidx];
1121         struct fb_ops *fb = info->fbops;
1122         unsigned long off;
1123 #if !defined(__sparc__) || defined(__sparc_v9__)
1124         unsigned long start;
1125         u32 len;
1126 #endif
1127
1128         if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
1129                 return -EINVAL;
1130         off = vma->vm_pgoff << PAGE_SHIFT;
1131         if (!fb)
1132                 return -ENODEV;
1133         if (fb->fb_mmap) {
1134                 int res;
1135                 lock_kernel();
1136                 res = fb->fb_mmap(info, vma);
1137                 unlock_kernel();
1138                 return res;
1139         }
1140
1141 #if defined(__sparc__) && !defined(__sparc_v9__)
1142         /* Should never get here, all fb drivers should have their own
1143            mmap routines */
1144         return -EINVAL;
1145 #else
1146         /* !sparc32... */
1147         lock_kernel();
1148
1149         /* frame buffer memory */
1150         start = info->fix.smem_start;
1151         len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
1152         if (off >= len) {
1153                 /* memory mapped io */
1154                 off -= len;
1155                 if (info->var.accel_flags) {
1156                         unlock_kernel();
1157                         return -EINVAL;
1158                 }
1159                 start = info->fix.mmio_start;
1160                 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
1161         }
1162         unlock_kernel();
1163         start &= PAGE_MASK;
1164         if ((vma->vm_end - vma->vm_start + off) > len)
1165                 return -EINVAL;
1166         off += start;
1167         vma->vm_pgoff = off >> PAGE_SHIFT;
1168         /* This is an IO map - tell maydump to skip this VMA */
1169         vma->vm_flags |= VM_IO | VM_RESERVED;
1170 #if defined(__mc68000__)
1171 #if defined(CONFIG_SUN3)
1172         pgprot_val(vma->vm_page_prot) |= SUN3_PAGE_NOCACHE;
1173 #elif defined(CONFIG_MMU)
1174         if (CPU_IS_020_OR_030)
1175                 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE030;
1176         if (CPU_IS_040_OR_060) {
1177                 pgprot_val(vma->vm_page_prot) &= _CACHEMASK040;
1178                 /* Use no-cache mode, serialized */
1179                 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE_S;
1180         }
1181 #endif
1182 #elif defined(__powerpc__)
1183         vma->vm_page_prot = phys_mem_access_prot(file, off >> PAGE_SHIFT,
1184                                                  vma->vm_end - vma->vm_start,
1185                                                  vma->vm_page_prot);
1186 #elif defined(__alpha__)
1187         /* Caching is off in the I/O space quadrant by design.  */
1188 #elif defined(__i386__) || defined(__x86_64__)
1189         if (boot_cpu_data.x86 > 3)
1190                 pgprot_val(vma->vm_page_prot) |= _PAGE_PCD;
1191 #elif defined(__mips__) || defined(__sparc_v9__)
1192         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1193 #elif defined(__hppa__)
1194         pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
1195 #elif defined(__arm__) || defined(__sh__) || defined(__m32r__)
1196         vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
1197 #elif defined(__ia64__)
1198         if (efi_range_is_wc(vma->vm_start, vma->vm_end - vma->vm_start))
1199                 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
1200         else
1201                 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1202 #else
1203 #warning What do we have to do here??
1204 #endif
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 #endif /* !sparc32 */
1210 }
1211
1212 static int
1213 fb_open(struct inode *inode, struct file *file)
1214 {
1215         int fbidx = iminor(inode);
1216         struct fb_info *info;
1217         int res = 0;
1218
1219         if (fbidx >= FB_MAX)
1220                 return -ENODEV;
1221 #ifdef CONFIG_KMOD
1222         if (!(info = registered_fb[fbidx]))
1223                 try_to_load(fbidx);
1224 #endif /* CONFIG_KMOD */
1225         if (!(info = registered_fb[fbidx]))
1226                 return -ENODEV;
1227         if (!try_module_get(info->fbops->owner))
1228                 return -ENODEV;
1229         file->private_data = info;
1230         if (info->fbops->fb_open) {
1231                 res = info->fbops->fb_open(info,1);
1232                 if (res)
1233                         module_put(info->fbops->owner);
1234         }
1235         return res;
1236 }
1237
1238 static int
1239 fb_release(struct inode *inode, struct file *file)
1240 {
1241         struct fb_info * const info = file->private_data;
1242
1243         lock_kernel();
1244         if (info->fbops->fb_release)
1245                 info->fbops->fb_release(info,1);
1246         module_put(info->fbops->owner);
1247         unlock_kernel();
1248         return 0;
1249 }
1250
1251 static const struct file_operations fb_fops = {
1252         .owner =        THIS_MODULE,
1253         .read =         fb_read,
1254         .write =        fb_write,
1255         .ioctl =        fb_ioctl,
1256 #ifdef CONFIG_COMPAT
1257         .compat_ioctl = fb_compat_ioctl,
1258 #endif
1259         .mmap =         fb_mmap,
1260         .open =         fb_open,
1261         .release =      fb_release,
1262 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1263         .get_unmapped_area = get_fb_unmapped_area,
1264 #endif
1265 #ifdef CONFIG_FB_DEFERRED_IO
1266         .fsync =        fb_deferred_io_fsync,
1267 #endif
1268 };
1269
1270 struct class *fb_class;
1271 EXPORT_SYMBOL(fb_class);
1272 /**
1273  *      register_framebuffer - registers a frame buffer device
1274  *      @fb_info: frame buffer info structure
1275  *
1276  *      Registers a frame buffer device @fb_info.
1277  *
1278  *      Returns negative errno on error, or zero for success.
1279  *
1280  */
1281
1282 int
1283 register_framebuffer(struct fb_info *fb_info)
1284 {
1285         int i;
1286         struct fb_event event;
1287         struct fb_videomode mode;
1288
1289         if (num_registered_fb == FB_MAX)
1290                 return -ENXIO;
1291         num_registered_fb++;
1292         for (i = 0 ; i < FB_MAX; i++)
1293                 if (!registered_fb[i])
1294                         break;
1295         fb_info->node = i;
1296
1297         fb_info->dev = device_create(fb_class, fb_info->device,
1298                                      MKDEV(FB_MAJOR, i), "fb%d", i);
1299         if (IS_ERR(fb_info->dev)) {
1300                 /* Not fatal */
1301                 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1302                 fb_info->dev = NULL;
1303         } else
1304                 fb_init_device(fb_info);
1305
1306         if (fb_info->pixmap.addr == NULL) {
1307                 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1308                 if (fb_info->pixmap.addr) {
1309                         fb_info->pixmap.size = FBPIXMAPSIZE;
1310                         fb_info->pixmap.buf_align = 1;
1311                         fb_info->pixmap.scan_align = 1;
1312                         fb_info->pixmap.access_align = 32;
1313                         fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1314                 }
1315         }
1316         fb_info->pixmap.offset = 0;
1317
1318         if (!fb_info->modelist.prev || !fb_info->modelist.next)
1319                 INIT_LIST_HEAD(&fb_info->modelist);
1320
1321         fb_var_to_videomode(&mode, &fb_info->var);
1322         fb_add_videomode(&mode, &fb_info->modelist);
1323         registered_fb[i] = fb_info;
1324
1325         event.info = fb_info;
1326         fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1327         return 0;
1328 }
1329
1330
1331 /**
1332  *      unregister_framebuffer - releases a frame buffer device
1333  *      @fb_info: frame buffer info structure
1334  *
1335  *      Unregisters a frame buffer device @fb_info.
1336  *
1337  *      Returns negative errno on error, or zero for success.
1338  *
1339  */
1340
1341 int
1342 unregister_framebuffer(struct fb_info *fb_info)
1343 {
1344         struct fb_event event;
1345         int i;
1346
1347         i = fb_info->node;
1348         if (!registered_fb[i])
1349                 return -EINVAL;
1350
1351         if (fb_info->pixmap.addr &&
1352             (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1353                 kfree(fb_info->pixmap.addr);
1354         fb_destroy_modelist(&fb_info->modelist);
1355         registered_fb[i]=NULL;
1356         num_registered_fb--;
1357         fb_cleanup_device(fb_info);
1358         device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1359         event.info = fb_info;
1360         fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1361         return 0;
1362 }
1363
1364 /**
1365  *      fb_set_suspend - low level driver signals suspend
1366  *      @info: framebuffer affected
1367  *      @state: 0 = resuming, !=0 = suspending
1368  *
1369  *      This is meant to be used by low level drivers to
1370  *      signal suspend/resume to the core & clients.
1371  *      It must be called with the console semaphore held
1372  */
1373 void fb_set_suspend(struct fb_info *info, int state)
1374 {
1375         struct fb_event event;
1376
1377         event.info = info;
1378         if (state) {
1379                 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event);
1380                 info->state = FBINFO_STATE_SUSPENDED;
1381         } else {
1382                 info->state = FBINFO_STATE_RUNNING;
1383                 fb_notifier_call_chain(FB_EVENT_RESUME, &event);
1384         }
1385 }
1386
1387 /**
1388  *      fbmem_init - init frame buffer subsystem
1389  *
1390  *      Initialize the frame buffer subsystem.
1391  *
1392  *      NOTE: This function is _only_ to be called by drivers/char/mem.c.
1393  *
1394  */
1395
1396 static int __init
1397 fbmem_init(void)
1398 {
1399         create_proc_read_entry("fb", 0, NULL, fbmem_read_proc, NULL);
1400
1401         if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1402                 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1403
1404         fb_class = class_create(THIS_MODULE, "graphics");
1405         if (IS_ERR(fb_class)) {
1406                 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1407                 fb_class = NULL;
1408         }
1409         return 0;
1410 }
1411
1412 #ifdef MODULE
1413 module_init(fbmem_init);
1414 static void __exit
1415 fbmem_exit(void)
1416 {
1417         class_destroy(fb_class);
1418         unregister_chrdev(FB_MAJOR, "fb");
1419 }
1420
1421 module_exit(fbmem_exit);
1422 MODULE_LICENSE("GPL");
1423 MODULE_DESCRIPTION("Framebuffer base");
1424 #else
1425 subsys_initcall(fbmem_init);
1426 #endif
1427
1428 int fb_new_modelist(struct fb_info *info)
1429 {
1430         struct fb_event event;
1431         struct fb_var_screeninfo var = info->var;
1432         struct list_head *pos, *n;
1433         struct fb_modelist *modelist;
1434         struct fb_videomode *m, mode;
1435         int err = 1;
1436
1437         list_for_each_safe(pos, n, &info->modelist) {
1438                 modelist = list_entry(pos, struct fb_modelist, list);
1439                 m = &modelist->mode;
1440                 fb_videomode_to_var(&var, m);
1441                 var.activate = FB_ACTIVATE_TEST;
1442                 err = fb_set_var(info, &var);
1443                 fb_var_to_videomode(&mode, &var);
1444                 if (err || !fb_mode_is_equal(m, &mode)) {
1445                         list_del(pos);
1446                         kfree(pos);
1447                 }
1448         }
1449
1450         err = 1;
1451
1452         if (!list_empty(&info->modelist)) {
1453                 event.info = info;
1454                 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
1455         }
1456
1457         return err;
1458 }
1459
1460 static char *video_options[FB_MAX] __read_mostly;
1461 static int ofonly __read_mostly;
1462
1463 extern const char *global_mode_option;
1464
1465 /**
1466  * fb_get_options - get kernel boot parameters
1467  * @name:   framebuffer name as it would appear in
1468  *          the boot parameter line
1469  *          (video=<name>:<options>)
1470  * @option: the option will be stored here
1471  *
1472  * NOTE: Needed to maintain backwards compatibility
1473  */
1474 int fb_get_options(char *name, char **option)
1475 {
1476         char *opt, *options = NULL;
1477         int opt_len, retval = 0;
1478         int name_len = strlen(name), i;
1479
1480         if (name_len && ofonly && strncmp(name, "offb", 4))
1481                 retval = 1;
1482
1483         if (name_len && !retval) {
1484                 for (i = 0; i < FB_MAX; i++) {
1485                         if (video_options[i] == NULL)
1486                                 continue;
1487                         opt_len = strlen(video_options[i]);
1488                         if (!opt_len)
1489                                 continue;
1490                         opt = video_options[i];
1491                         if (!strncmp(name, opt, name_len) &&
1492                             opt[name_len] == ':')
1493                                 options = opt + name_len + 1;
1494                 }
1495         }
1496         if (options && !strncmp(options, "off", 3))
1497                 retval = 1;
1498
1499         if (option)
1500                 *option = options;
1501
1502         return retval;
1503 }
1504
1505 #ifndef MODULE
1506 /**
1507  *      video_setup - process command line options
1508  *      @options: string of options
1509  *
1510  *      Process command line options for frame buffer subsystem.
1511  *
1512  *      NOTE: This function is a __setup and __init function.
1513  *            It only stores the options.  Drivers have to call
1514  *            fb_get_options() as necessary.
1515  *
1516  *      Returns zero.
1517  *
1518  */
1519 static int __init video_setup(char *options)
1520 {
1521         int i, global = 0;
1522
1523         if (!options || !*options)
1524                 global = 1;
1525
1526         if (!global && !strncmp(options, "ofonly", 6)) {
1527                 ofonly = 1;
1528                 global = 1;
1529         }
1530
1531         if (!global && !strstr(options, "fb:")) {
1532                 global_mode_option = options;
1533                 global = 1;
1534         }
1535
1536         if (!global) {
1537                 for (i = 0; i < FB_MAX; i++) {
1538                         if (video_options[i] == NULL) {
1539                                 video_options[i] = options;
1540                                 break;
1541                         }
1542
1543                 }
1544         }
1545
1546         return 1;
1547 }
1548 __setup("video=", video_setup);
1549 #endif
1550
1551     /*
1552      *  Visible symbols for modules
1553      */
1554
1555 EXPORT_SYMBOL(register_framebuffer);
1556 EXPORT_SYMBOL(unregister_framebuffer);
1557 EXPORT_SYMBOL(num_registered_fb);
1558 EXPORT_SYMBOL(registered_fb);
1559 EXPORT_SYMBOL(fb_prepare_logo);
1560 EXPORT_SYMBOL(fb_show_logo);
1561 EXPORT_SYMBOL(fb_set_var);
1562 EXPORT_SYMBOL(fb_blank);
1563 EXPORT_SYMBOL(fb_pan_display);
1564 EXPORT_SYMBOL(fb_get_buffer_offset);
1565 EXPORT_SYMBOL(fb_set_suspend);
1566 EXPORT_SYMBOL(fb_get_options);
1567
1568 MODULE_LICENSE("GPL");