err.no Git - linux-2.6/blob - 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 - image->dx;
 358                 image->dy = info->var.yres - image->height - image->dy;
 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                 tmp = image->dy;
 366                 image->dy = image->dx;
 367                 image->dx = info->var.xres - image->width - tmp;
 368         } else if (rotate == FB_ROTATE_CCW) {
 369                 fb_rotate_logo_ccw(image->data, dst, image->width,
 370                                    image->height);
 371                 tmp = image->width;
 372                 image->width = image->height;
 373                 image->height = tmp;
 374                 tmp = image->dx;
 375                 image->dx = image->dy;
 376                 image->dy = info->var.yres - image->height - tmp;
 377         }
 378
 379         image->data = dst;
 380 }
 381
 382 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
 383                             int rotate, unsigned int num)
 384 {
 385         unsigned int x;
 386
 387         if (rotate == FB_ROTATE_UR) {
 388                 for (x = 0;
 389                      x < num && image->dx + image->width <= info->var.xres;
 390                      x++) {
 391                         info->fbops->fb_imageblit(info, image);
 392                         image->dx += image->width + 8;
 393                 }
 394         } else if (rotate == FB_ROTATE_UD) {
 395                 for (x = 0; x < num && image->dx >= 0; x++) {
 396                         info->fbops->fb_imageblit(info, image);
 397                         image->dx -= image->width + 8;
 398                 }
 399         } else if (rotate == FB_ROTATE_CW) {
 400                 for (x = 0;
 401                      x < num && image->dy + image->height <= info->var.yres;
 402                      x++) {
 403                         info->fbops->fb_imageblit(info, image);
 404                         image->dy += image->height + 8;
 405                 }
 406         } else if (rotate == FB_ROTATE_CCW) {
 407                 for (x = 0; x < num && image->dy >= 0; x++) {
 408                         info->fbops->fb_imageblit(info, image);
 409                         image->dy -= image->height + 8;
 410                 }
 411         }
 412 }
 413
 414 int fb_prepare_logo(struct fb_info *info, int rotate)
 415 {
 416         int depth = fb_get_color_depth(&info->var, &info->fix);
 417         int yres;
 418
 419         memset(&fb_logo, 0, sizeof(struct logo_data));
 420
 421         if (info->flags & FBINFO_MISC_TILEBLITTING ||
 422             info->flags & FBINFO_MODULE)
 423                 return 0;
 424
 425         if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
 426                 depth = info->var.blue.length;
 427                 if (info->var.red.length < depth)
 428                         depth = info->var.red.length;
 429                 if (info->var.green.length < depth)
 430                         depth = info->var.green.length;
 431         }
 432
 433         if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) {
 434                 /* assume console colormap */
 435                 depth = 4;
 436         }
 437
 438         if (depth >= 8) {
 439                 switch (info->fix.visual) {
 440                 case FB_VISUAL_TRUECOLOR:
 441                         fb_logo.needs_truepalette = 1;
 442                         break;
 443                 case FB_VISUAL_DIRECTCOLOR:
 444                         fb_logo.needs_directpalette = 1;
 445                         fb_logo.needs_cmapreset = 1;
 446                         break;
 447                 case FB_VISUAL_PSEUDOCOLOR:
 448                         fb_logo.needs_cmapreset = 1;
 449                         break;
 450                 }
 451         }
 452
 453         /* Return if no suitable logo was found */
 454         fb_logo.logo = fb_find_logo(depth);
 455
 456         if (!fb_logo.logo) {
 457                 return 0;
 458         }
 459
 460         if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
 461                 yres = info->var.yres;
 462         else
 463                 yres = info->var.xres;
 464
 465         if (fb_logo.logo->height > yres) {
 466                 fb_logo.logo = NULL;
 467                 return 0;
 468         }
 469
 470         /* What depth we asked for might be different from what we get */
 471         if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
 472                 fb_logo.depth = 8;
 473         else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
 474                 fb_logo.depth = 4;
 475         else
 476                 fb_logo.depth = 1;
 477         return fb_logo.logo->height;
 478 }
 479
 480 int fb_show_logo(struct fb_info *info, int rotate)
 481 {
 482         u32 *palette = NULL, *saved_pseudo_palette = NULL;
 483         unsigned char *logo_new = NULL, *logo_rotate = NULL;
 484         struct fb_image image;
 485
 486         /* Return if the frame buffer is not mapped or suspended */
 487         if (fb_logo.logo == NULL || info->state != FBINFO_STATE_RUNNING ||
 488             info->flags & FBINFO_MODULE)
 489                 return 0;
 490
 491         image.depth = 8;
 492         image.data = fb_logo.logo->data;
 493
 494         if (fb_logo.needs_cmapreset)
 495                 fb_set_logocmap(info, fb_logo.logo);
 496
 497         if (fb_logo.needs_truepalette ||
 498             fb_logo.needs_directpalette) {
 499                 palette = kmalloc(256 * 4, GFP_KERNEL);
 500                 if (palette == NULL)
 501                         return 0;
 502
 503                 if (fb_logo.needs_truepalette)
 504                         fb_set_logo_truepalette(info, fb_logo.logo, palette);
 505                 else
 506                         fb_set_logo_directpalette(info, fb_logo.logo, palette);
 507
 508                 saved_pseudo_palette = info->pseudo_palette;
 509                 info->pseudo_palette = palette;
 510         }
 511
 512         if (fb_logo.depth <= 4) {
 513                 logo_new = kmalloc(fb_logo.logo->width * fb_logo.logo->height,
 514                                    GFP_KERNEL);
 515                 if (logo_new == NULL) {
 516                         kfree(palette);
 517                         if (saved_pseudo_palette)
 518                                 info->pseudo_palette = saved_pseudo_palette;
 519                         return 0;
 520                 }
 521                 image.data = logo_new;
 522                 fb_set_logo(info, fb_logo.logo, logo_new, fb_logo.depth);
 523         }
 524
 525         image.dx = 0;
 526         image.dy = 0;
 527         image.width = fb_logo.logo->width;
 528         image.height = fb_logo.logo->height;
 529
 530         if (rotate) {
 531                 logo_rotate = kmalloc(fb_logo.logo->width *
 532                                       fb_logo.logo->height, GFP_KERNEL);
 533                 if (logo_rotate)
 534                         fb_rotate_logo(info, logo_rotate, &image, rotate);
 535         }
 536
 537         fb_do_show_logo(info, &image, rotate, num_online_cpus());
 538
 539         kfree(palette);
 540         if (saved_pseudo_palette != NULL)
 541                 info->pseudo_palette = saved_pseudo_palette;
 542         kfree(logo_new);
 543         kfree(logo_rotate);
 544         return fb_logo.logo->height;
 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 err, flags = info->flags;
 803
 804         if (var->activate & FB_ACTIVATE_INV_MODE) {
 805                 struct fb_videomode mode1, mode2;
 806                 int ret = 0;
 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                 return ret;
 825         }
 826
 827         if ((var->activate & FB_ACTIVATE_FORCE) ||
 828             memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
 829                 u32 activate = var->activate;
 830
 831                 if (!info->fbops->fb_check_var) {
 832                         *var = info->var;
 833                         return 0;
 834                 }
 835
 836                 if ((err = info->fbops->fb_check_var(var, info)))
 837                         return err;
 838
 839                 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
 840                         struct fb_videomode mode;
 841                         int err = 0;
 842
 843                         if (info->fbops->fb_get_caps) {
 844                                 err = fb_check_caps(info, var, activate);
 845
 846                                 if (err)
 847                                         goto done;
 848                         }
 849
 850                         info->var = *var;
 851
 852                         if (info->fbops->fb_set_par)
 853                                 info->fbops->fb_set_par(info);
 854
 855                         fb_pan_display(info, &info->var);
 856
 857                         fb_set_cmap(&info->cmap, info);
 858
 859                         fb_var_to_videomode(&mode, &info->var);
 860
 861                         if (info->modelist.prev && info->modelist.next &&
 862                             !list_empty(&info->modelist))
 863                                 err = fb_add_videomode(&mode, &info->modelist);
 864
 865                         if (!err && (flags & FBINFO_MISC_USEREVENT)) {
 866                                 struct fb_event event;
 867                                 int evnt = (activate & FB_ACTIVATE_ALL) ?
 868                                         FB_EVENT_MODE_CHANGE_ALL :
 869                                         FB_EVENT_MODE_CHANGE;
 870
 871                                 info->flags &= ~FBINFO_MISC_USEREVENT;
 872                                 event.info = info;
 873                                 fb_notifier_call_chain(evnt, &event);
 874                         }
 875                 }
 876         }
 877
 878  done:
 879         return 0;
 880 }
 881
 882 int
 883 fb_blank(struct fb_info *info, int blank)
 884 {
 885         int ret = -EINVAL;
 886
 887         if (blank > FB_BLANK_POWERDOWN)
 888                 blank = FB_BLANK_POWERDOWN;
 889
 890         if (info->fbops->fb_blank)
 891                 ret = info->fbops->fb_blank(blank, info);
 892
 893         if (!ret) {
 894                 struct fb_event event;
 895
 896                 event.info = info;
 897                 event.data = &blank;
 898                 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
 899         }
 900
 901         return ret;
 902 }
 903
 904 static int
 905 fb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
 906          unsigned long arg)
 907 {
 908         int fbidx = iminor(inode);
 909         struct fb_info *info = registered_fb[fbidx];
 910         struct fb_ops *fb = info->fbops;
 911         struct fb_var_screeninfo var;
 912         struct fb_fix_screeninfo fix;
 913         struct fb_con2fbmap con2fb;
 914         struct fb_cmap_user cmap;
 915         struct fb_event event;
 916         void __user *argp = (void __user *)arg;
 917         int i;
 918
 919         if (!fb)
 920                 return -ENODEV;
 921         switch (cmd) {
 922         case FBIOGET_VSCREENINFO:
 923                 return copy_to_user(argp, &info->var,
 924                                     sizeof(var)) ? -EFAULT : 0;
 925         case FBIOPUT_VSCREENINFO:
 926                 if (copy_from_user(&var, argp, sizeof(var)))
 927                         return -EFAULT;
 928                 acquire_console_sem();
 929                 info->flags |= FBINFO_MISC_USEREVENT;
 930                 i = fb_set_var(info, &var);
 931                 info->flags &= ~FBINFO_MISC_USEREVENT;
 932                 release_console_sem();
 933                 if (i) return i;
 934                 if (copy_to_user(argp, &var, sizeof(var)))
 935                         return -EFAULT;
 936                 return 0;
 937         case FBIOGET_FSCREENINFO:
 938                 return copy_to_user(argp, &info->fix,
 939                                     sizeof(fix)) ? -EFAULT : 0;
 940         case FBIOPUTCMAP:
 941                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
 942                         return -EFAULT;
 943                 return (fb_set_user_cmap(&cmap, info));
 944         case FBIOGETCMAP:
 945                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
 946                         return -EFAULT;
 947                 return fb_cmap_to_user(&info->cmap, &cmap);
 948         case FBIOPAN_DISPLAY:
 949                 if (copy_from_user(&var, argp, sizeof(var)))
 950                         return -EFAULT;
 951                 acquire_console_sem();
 952                 i = fb_pan_display(info, &var);
 953                 release_console_sem();
 954                 if (i)
 955                         return i;
 956                 if (copy_to_user(argp, &var, sizeof(var)))
 957                         return -EFAULT;
 958                 return 0;
 959         case FBIO_CURSOR:
 960                 return -EINVAL;
 961         case FBIOGET_CON2FBMAP:
 962                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
 963                         return -EFAULT;
 964                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
 965                     return -EINVAL;
 966                 con2fb.framebuffer = -1;
 967                 event.info = info;
 968                 event.data = &con2fb;
 969                 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
 970                 return copy_to_user(argp, &con2fb,
 971                                     sizeof(con2fb)) ? -EFAULT : 0;
 972         case FBIOPUT_CON2FBMAP:
 973                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
 974                         return - EFAULT;
 975                 if (con2fb.console < 0 || con2fb.console > MAX_NR_CONSOLES)
 976                     return -EINVAL;
 977                 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
 978                     return -EINVAL;
 979 #ifdef CONFIG_KMOD
 980                 if (!registered_fb[con2fb.framebuffer])
 981                     try_to_load(con2fb.framebuffer);
 982 #endif /* CONFIG_KMOD */
 983                 if (!registered_fb[con2fb.framebuffer])
 984                     return -EINVAL;
 985                 event.info = info;
 986                 event.data = &con2fb;
 987                 return fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP,
 988                                               &event);
 989         case FBIOBLANK:
 990                 acquire_console_sem();
 991                 info->flags |= FBINFO_MISC_USEREVENT;
 992                 i = fb_blank(info, arg);
 993                 info->flags &= ~FBINFO_MISC_USEREVENT;
 994                 release_console_sem();
 995                 return i;
 996         default:
 997                 if (fb->fb_ioctl == NULL)
 998                         return -EINVAL;
 999                 return fb->fb_ioctl(info, cmd, arg);
1000         }
1001 }
1002
1003 #ifdef CONFIG_COMPAT
1004 struct fb_fix_screeninfo32 {
1005         char                    id[16];
1006         compat_caddr_t          smem_start;
1007         u32                     smem_len;
1008         u32                     type;
1009         u32                     type_aux;
1010         u32                     visual;
1011         u16                     xpanstep;
1012         u16                     ypanstep;
1013         u16                     ywrapstep;
1014         u32                     line_length;
1015         compat_caddr_t          mmio_start;
1016         u32                     mmio_len;
1017         u32                     accel;
1018         u16                     reserved[3];
1019 };
1020
1021 struct fb_cmap32 {
1022         u32                     start;
1023         u32                     len;
1024         compat_caddr_t  red;
1025         compat_caddr_t  green;
1026         compat_caddr_t  blue;
1027         compat_caddr_t  transp;
1028 };
1029
1030 static int fb_getput_cmap(struct inode *inode, struct file *file,
1031                         unsigned int cmd, unsigned long arg)
1032 {
1033         struct fb_cmap_user __user *cmap;
1034         struct fb_cmap32 __user *cmap32;
1035         __u32 data;
1036         int err;
1037
1038         cmap = compat_alloc_user_space(sizeof(*cmap));
1039         cmap32 = compat_ptr(arg);
1040
1041         if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1042                 return -EFAULT;
1043
1044         if (get_user(data, &cmap32->red) ||
1045             put_user(compat_ptr(data), &cmap->red) ||
1046             get_user(data, &cmap32->green) ||
1047             put_user(compat_ptr(data), &cmap->green) ||
1048             get_user(data, &cmap32->blue) ||
1049             put_user(compat_ptr(data), &cmap->blue) ||
1050             get_user(data, &cmap32->transp) ||
1051             put_user(compat_ptr(data), &cmap->transp))
1052                 return -EFAULT;
1053
1054         err = fb_ioctl(inode, file, cmd, (unsigned long) cmap);
1055
1056         if (!err) {
1057                 if (copy_in_user(&cmap32->start,
1058                                  &cmap->start,
1059                                  2 * sizeof(__u32)))
1060                         err = -EFAULT;
1061         }
1062         return err;
1063 }
1064
1065 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1066                                   struct fb_fix_screeninfo32 __user *fix32)
1067 {
1068         __u32 data;
1069         int err;
1070
1071         err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1072
1073         data = (__u32) (unsigned long) fix->smem_start;
1074         err |= put_user(data, &fix32->smem_start);
1075
1076         err |= put_user(fix->smem_len, &fix32->smem_len);
1077         err |= put_user(fix->type, &fix32->type);
1078         err |= put_user(fix->type_aux, &fix32->type_aux);
1079         err |= put_user(fix->visual, &fix32->visual);
1080         err |= put_user(fix->xpanstep, &fix32->xpanstep);
1081         err |= put_user(fix->ypanstep, &fix32->ypanstep);
1082         err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1083         err |= put_user(fix->line_length, &fix32->line_length);
1084
1085         data = (__u32) (unsigned long) fix->mmio_start;
1086         err |= put_user(data, &fix32->mmio_start);
1087
1088         err |= put_user(fix->mmio_len, &fix32->mmio_len);
1089         err |= put_user(fix->accel, &fix32->accel);
1090         err |= copy_to_user(fix32->reserved, fix->reserved,
1091                             sizeof(fix->reserved));
1092
1093         return err;
1094 }
1095
1096 static int fb_get_fscreeninfo(struct inode *inode, struct file *file,
1097                                 unsigned int cmd, unsigned long arg)
1098 {
1099         mm_segment_t old_fs;
1100         struct fb_fix_screeninfo fix;
1101         struct fb_fix_screeninfo32 __user *fix32;
1102         int err;
1103
1104         fix32 = compat_ptr(arg);
1105
1106         old_fs = get_fs();
1107         set_fs(KERNEL_DS);
1108         err = fb_ioctl(inode, file, cmd, (unsigned long) &fix);
1109         set_fs(old_fs);
1110
1111         if (!err)
1112                 err = do_fscreeninfo_to_user(&fix, fix32);
1113
1114         return err;
1115 }
1116
1117 static long
1118 fb_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1119 {
1120         struct inode *inode = file->f_path.dentry->d_inode;
1121         int fbidx = iminor(inode);
1122         struct fb_info *info = registered_fb[fbidx];
1123         struct fb_ops *fb = info->fbops;
1124         long ret = -ENOIOCTLCMD;
1125
1126         lock_kernel();
1127         switch(cmd) {
1128         case FBIOGET_VSCREENINFO:
1129         case FBIOPUT_VSCREENINFO:
1130         case FBIOPAN_DISPLAY:
1131         case FBIOGET_CON2FBMAP:
1132         case FBIOPUT_CON2FBMAP:
1133                 arg = (unsigned long) compat_ptr(arg);
1134         case FBIOBLANK:
1135                 ret = fb_ioctl(inode, file, cmd, arg);
1136                 break;
1137
1138         case FBIOGET_FSCREENINFO:
1139                 ret = fb_get_fscreeninfo(inode, file, cmd, arg);
1140                 break;
1141
1142         case FBIOGETCMAP:
1143         case FBIOPUTCMAP:
1144                 ret = fb_getput_cmap(inode, file, cmd, arg);
1145                 break;
1146
1147         default:
1148                 if (fb->fb_compat_ioctl)
1149                         ret = fb->fb_compat_ioctl(info, cmd, arg);
1150                 break;
1151         }
1152         unlock_kernel();
1153         return ret;
1154 }
1155 #endif
1156
1157 static int
1158 fb_mmap(struct file *file, struct vm_area_struct * vma)
1159 {
1160         int fbidx = iminor(file->f_path.dentry->d_inode);
1161         struct fb_info *info = registered_fb[fbidx];
1162         struct fb_ops *fb = info->fbops;
1163         unsigned long off;
1164 #if !defined(__sparc__) || defined(__sparc_v9__)
1165         unsigned long start;
1166         u32 len;
1167 #endif
1168
1169         if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
1170                 return -EINVAL;
1171         off = vma->vm_pgoff << PAGE_SHIFT;
1172         if (!fb)
1173                 return -ENODEV;
1174         if (fb->fb_mmap) {
1175                 int res;
1176                 lock_kernel();
1177                 res = fb->fb_mmap(info, vma);
1178                 unlock_kernel();
1179                 return res;
1180         }
1181
1182 #if defined(__sparc__) && !defined(__sparc_v9__)
1183         /* Should never get here, all fb drivers should have their own
1184            mmap routines */
1185         return -EINVAL;
1186 #else
1187         /* !sparc32... */
1188         lock_kernel();
1189
1190         /* frame buffer memory */
1191         start = info->fix.smem_start;
1192         len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
1193         if (off >= len) {
1194                 /* memory mapped io */
1195                 off -= len;
1196                 if (info->var.accel_flags) {
1197                         unlock_kernel();
1198                         return -EINVAL;
1199                 }
1200                 start = info->fix.mmio_start;
1201                 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
1202         }
1203         unlock_kernel();
1204         start &= PAGE_MASK;
1205         if ((vma->vm_end - vma->vm_start + off) > len)
1206                 return -EINVAL;
1207         off += start;
1208         vma->vm_pgoff = off >> PAGE_SHIFT;
1209         /* This is an IO map - tell maydump to skip this VMA */
1210         vma->vm_flags |= VM_IO | VM_RESERVED;
1211 #if defined(__mc68000__)
1212 #if defined(CONFIG_SUN3)
1213         pgprot_val(vma->vm_page_prot) |= SUN3_PAGE_NOCACHE;
1214 #elif defined(CONFIG_MMU)
1215         if (CPU_IS_020_OR_030)
1216                 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE030;
1217         if (CPU_IS_040_OR_060) {
1218                 pgprot_val(vma->vm_page_prot) &= _CACHEMASK040;
1219                 /* Use no-cache mode, serialized */
1220                 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE_S;
1221         }
1222 #endif
1223 #elif defined(__powerpc__)
1224         vma->vm_page_prot = phys_mem_access_prot(file, off >> PAGE_SHIFT,
1225                                                  vma->vm_end - vma->vm_start,
1226                                                  vma->vm_page_prot);
1227 #elif defined(__alpha__)
1228         /* Caching is off in the I/O space quadrant by design.  */
1229 #elif defined(__i386__) || defined(__x86_64__)
1230         if (boot_cpu_data.x86 > 3)
1231                 pgprot_val(vma->vm_page_prot) |= _PAGE_PCD;
1232 #elif defined(__mips__) || defined(__sparc_v9__)
1233         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1234 #elif defined(__hppa__)
1235         pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
1236 #elif defined(__arm__) || defined(__sh__) || defined(__m32r__)
1237         vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
1238 #elif defined(__ia64__)
1239         if (efi_range_is_wc(vma->vm_start, vma->vm_end - vma->vm_start))
1240                 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
1241         else
1242                 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1243 #else
1244 #warning What do we have to do here??
1245 #endif
1246         if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1247                              vma->vm_end - vma->vm_start, vma->vm_page_prot))
1248                 return -EAGAIN;
1249         return 0;
1250 #endif /* !sparc32 */
1251 }
1252
1253 static int
1254 fb_open(struct inode *inode, struct file *file)
1255 {
1256         int fbidx = iminor(inode);
1257         struct fb_info *info;
1258         int res = 0;
1259
1260         if (fbidx >= FB_MAX)
1261                 return -ENODEV;
1262 #ifdef CONFIG_KMOD
1263         if (!(info = registered_fb[fbidx]))
1264                 try_to_load(fbidx);
1265 #endif /* CONFIG_KMOD */
1266         if (!(info = registered_fb[fbidx]))
1267                 return -ENODEV;
1268         if (!try_module_get(info->fbops->owner))
1269                 return -ENODEV;
1270         file->private_data = info;
1271         if (info->fbops->fb_open) {
1272                 res = info->fbops->fb_open(info,1);
1273                 if (res)
1274                         module_put(info->fbops->owner);
1275         }
1276         return res;
1277 }
1278
1279 static int
1280 fb_release(struct inode *inode, struct file *file)
1281 {
1282         struct fb_info * const info = file->private_data;
1283
1284         lock_kernel();
1285         if (info->fbops->fb_release)
1286                 info->fbops->fb_release(info,1);
1287         module_put(info->fbops->owner);
1288         unlock_kernel();
1289         return 0;
1290 }
1291
1292 static const struct file_operations fb_fops = {
1293         .owner =        THIS_MODULE,
1294         .read =         fb_read,
1295         .write =        fb_write,
1296         .ioctl =        fb_ioctl,
1297 #ifdef CONFIG_COMPAT
1298         .compat_ioctl = fb_compat_ioctl,
1299 #endif
1300         .mmap =         fb_mmap,
1301         .open =         fb_open,
1302         .release =      fb_release,
1303 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1304         .get_unmapped_area = get_fb_unmapped_area,
1305 #endif
1306 #ifdef CONFIG_FB_DEFERRED_IO
1307         .fsync =        fb_deferred_io_fsync,
1308 #endif
1309 };
1310
1311 struct class *fb_class;
1312 EXPORT_SYMBOL(fb_class);
1313 /**
1314  *      register_framebuffer - registers a frame buffer device
1315  *      @fb_info: frame buffer info structure
1316  *
1317  *      Registers a frame buffer device @fb_info.
1318  *
1319  *      Returns negative errno on error, or zero for success.
1320  *
1321  */
1322
1323 int
1324 register_framebuffer(struct fb_info *fb_info)
1325 {
1326         int i;
1327         struct fb_event event;
1328         struct fb_videomode mode;
1329
1330         if (num_registered_fb == FB_MAX)
1331                 return -ENXIO;
1332         num_registered_fb++;
1333         for (i = 0 ; i < FB_MAX; i++)
1334                 if (!registered_fb[i])
1335                         break;
1336         fb_info->node = i;
1337
1338         fb_info->dev = device_create(fb_class, fb_info->device,
1339                                      MKDEV(FB_MAJOR, i), "fb%d", i);
1340         if (IS_ERR(fb_info->dev)) {
1341                 /* Not fatal */
1342                 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1343                 fb_info->dev = NULL;
1344         } else
1345                 fb_init_device(fb_info);
1346
1347         if (fb_info->pixmap.addr == NULL) {
1348                 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1349                 if (fb_info->pixmap.addr) {
1350                         fb_info->pixmap.size = FBPIXMAPSIZE;
1351                         fb_info->pixmap.buf_align = 1;
1352                         fb_info->pixmap.scan_align = 1;
1353                         fb_info->pixmap.access_align = 32;
1354                         fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1355                 }
1356         }
1357         fb_info->pixmap.offset = 0;
1358
1359         if (!fb_info->pixmap.blit_x)
1360                 fb_info->pixmap.blit_x = ~(u32)0;
1361
1362         if (!fb_info->pixmap.blit_y)
1363                 fb_info->pixmap.blit_y = ~(u32)0;
1364
1365         if (!fb_info->modelist.prev || !fb_info->modelist.next)
1366                 INIT_LIST_HEAD(&fb_info->modelist);
1367
1368         fb_var_to_videomode(&mode, &fb_info->var);
1369         fb_add_videomode(&mode, &fb_info->modelist);
1370         registered_fb[i] = fb_info;
1371
1372         event.info = fb_info;
1373         fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1374         return 0;
1375 }
1376
1377
1378 /**
1379  *      unregister_framebuffer - releases a frame buffer device
1380  *      @fb_info: frame buffer info structure
1381  *
1382  *      Unregisters a frame buffer device @fb_info.
1383  *
1384  *      Returns negative errno on error, or zero for success.
1385  *
1386  */
1387
1388 int
1389 unregister_framebuffer(struct fb_info *fb_info)
1390 {
1391         struct fb_event event;
1392         int i;
1393
1394         i = fb_info->node;
1395         if (!registered_fb[i])
1396                 return -EINVAL;
1397
1398         if (fb_info->pixmap.addr &&
1399             (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1400                 kfree(fb_info->pixmap.addr);
1401         fb_destroy_modelist(&fb_info->modelist);
1402         registered_fb[i]=NULL;
1403         num_registered_fb--;
1404         fb_cleanup_device(fb_info);
1405         device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1406         event.info = fb_info;
1407         fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1408         return 0;
1409 }
1410
1411 /**
1412  *      fb_set_suspend - low level driver signals suspend
1413  *      @info: framebuffer affected
1414  *      @state: 0 = resuming, !=0 = suspending
1415  *
1416  *      This is meant to be used by low level drivers to
1417  *      signal suspend/resume to the core & clients.
1418  *      It must be called with the console semaphore held
1419  */
1420 void fb_set_suspend(struct fb_info *info, int state)
1421 {
1422         struct fb_event event;
1423
1424         event.info = info;
1425         if (state) {
1426                 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event);
1427                 info->state = FBINFO_STATE_SUSPENDED;
1428         } else {
1429                 info->state = FBINFO_STATE_RUNNING;
1430                 fb_notifier_call_chain(FB_EVENT_RESUME, &event);
1431         }
1432 }
1433
1434 /**
1435  *      fbmem_init - init frame buffer subsystem
1436  *
1437  *      Initialize the frame buffer subsystem.
1438  *
1439  *      NOTE: This function is _only_ to be called by drivers/char/mem.c.
1440  *
1441  */
1442
1443 static int __init
1444 fbmem_init(void)
1445 {
1446         create_proc_read_entry("fb", 0, NULL, fbmem_read_proc, NULL);
1447
1448         if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1449                 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1450
1451         fb_class = class_create(THIS_MODULE, "graphics");
1452         if (IS_ERR(fb_class)) {
1453                 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1454                 fb_class = NULL;
1455         }
1456         return 0;
1457 }
1458
1459 #ifdef MODULE
1460 module_init(fbmem_init);
1461 static void __exit
1462 fbmem_exit(void)
1463 {
1464         class_destroy(fb_class);
1465         unregister_chrdev(FB_MAJOR, "fb");
1466 }
1467
1468 module_exit(fbmem_exit);
1469 MODULE_LICENSE("GPL");
1470 MODULE_DESCRIPTION("Framebuffer base");
1471 #else
1472 subsys_initcall(fbmem_init);
1473 #endif
1474
1475 int fb_new_modelist(struct fb_info *info)
1476 {
1477         struct fb_event event;
1478         struct fb_var_screeninfo var = info->var;
1479         struct list_head *pos, *n;
1480         struct fb_modelist *modelist;
1481         struct fb_videomode *m, mode;
1482         int err = 1;
1483
1484         list_for_each_safe(pos, n, &info->modelist) {
1485                 modelist = list_entry(pos, struct fb_modelist, list);
1486                 m = &modelist->mode;
1487                 fb_videomode_to_var(&var, m);
1488                 var.activate = FB_ACTIVATE_TEST;
1489                 err = fb_set_var(info, &var);
1490                 fb_var_to_videomode(&mode, &var);
1491                 if (err || !fb_mode_is_equal(m, &mode)) {
1492                         list_del(pos);
1493                         kfree(pos);
1494                 }
1495         }
1496
1497         err = 1;
1498
1499         if (!list_empty(&info->modelist)) {
1500                 event.info = info;
1501                 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
1502         }
1503
1504         return err;
1505 }
1506
1507 static char *video_options[FB_MAX] __read_mostly;
1508 static int ofonly __read_mostly;
1509
1510 extern const char *global_mode_option;
1511
1512 /**
1513  * fb_get_options - get kernel boot parameters
1514  * @name:   framebuffer name as it would appear in
1515  *          the boot parameter line
1516  *          (video=<name>:<options>)
1517  * @option: the option will be stored here
1518  *
1519  * NOTE: Needed to maintain backwards compatibility
1520  */
1521 int fb_get_options(char *name, char **option)
1522 {
1523         char *opt, *options = NULL;
1524         int opt_len, retval = 0;
1525         int name_len = strlen(name), i;
1526
1527         if (name_len && ofonly && strncmp(name, "offb", 4))
1528                 retval = 1;
1529
1530         if (name_len && !retval) {
1531                 for (i = 0; i < FB_MAX; i++) {
1532                         if (video_options[i] == NULL)
1533                                 continue;
1534                         opt_len = strlen(video_options[i]);
1535                         if (!opt_len)
1536                                 continue;
1537                         opt = video_options[i];
1538                         if (!strncmp(name, opt, name_len) &&
1539                             opt[name_len] == ':')
1540                                 options = opt + name_len + 1;
1541                 }
1542         }
1543         if (options && !strncmp(options, "off", 3))
1544                 retval = 1;
1545
1546         if (option)
1547                 *option = options;
1548
1549         return retval;
1550 }
1551
1552 #ifndef MODULE
1553 /**
1554  *      video_setup - process command line options
1555  *      @options: string of options
1556  *
1557  *      Process command line options for frame buffer subsystem.
1558  *
1559  *      NOTE: This function is a __setup and __init function.
1560  *            It only stores the options.  Drivers have to call
1561  *            fb_get_options() as necessary.
1562  *
1563  *      Returns zero.
1564  *
1565  */
1566 static int __init video_setup(char *options)
1567 {
1568         int i, global = 0;
1569
1570         if (!options || !*options)
1571                 global = 1;
1572
1573         if (!global && !strncmp(options, "ofonly", 6)) {
1574                 ofonly = 1;
1575                 global = 1;
1576         }
1577
1578         if (!global && !strstr(options, "fb:")) {
1579                 global_mode_option = options;
1580                 global = 1;
1581         }
1582
1583         if (!global) {
1584                 for (i = 0; i < FB_MAX; i++) {
1585                         if (video_options[i] == NULL) {
1586                                 video_options[i] = options;
1587                                 break;
1588                         }
1589
1590                 }
1591         }
1592
1593         return 1;
1594 }
1595 __setup("video=", video_setup);
1596 #endif
1597
1598     /*
1599      *  Visible symbols for modules
1600      */
1601
1602 EXPORT_SYMBOL(register_framebuffer);
1603 EXPORT_SYMBOL(unregister_framebuffer);
1604 EXPORT_SYMBOL(num_registered_fb);
1605 EXPORT_SYMBOL(registered_fb);
1606 EXPORT_SYMBOL(fb_prepare_logo);
1607 EXPORT_SYMBOL(fb_show_logo);
1608 EXPORT_SYMBOL(fb_set_var);
1609 EXPORT_SYMBOL(fb_blank);
1610 EXPORT_SYMBOL(fb_pan_display);
1611 EXPORT_SYMBOL(fb_get_buffer_offset);
1612 EXPORT_SYMBOL(fb_set_suspend);
1613 EXPORT_SYMBOL(fb_get_options);
1614
1615 MODULE_LICENSE("GPL");