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/config.h>
  15 #include <linux/module.h>
  16
  17 #include <linux/types.h>
  18 #include <linux/errno.h>
  19 #include <linux/sched.h>
  20 #include <linux/smp_lock.h>
  21 #include <linux/kernel.h>
  22 #include <linux/major.h>
  23 #include <linux/slab.h>
  24 #include <linux/mm.h>
  25 #include <linux/mman.h>
  26 #include <linux/tty.h>
  27 #include <linux/init.h>
  28 #include <linux/linux_logo.h>
  29 #include <linux/proc_fs.h>
  30 #include <linux/console.h>
  31 #ifdef CONFIG_KMOD
  32 #include <linux/kmod.h>
  33 #endif
  34 #include <linux/devfs_fs_kernel.h>
  35 #include <linux/err.h>
  36 #include <linux/kernel.h>
  37 #include <linux/device.h>
  38 #include <linux/efi.h>
  39
  40 #if defined(__mc68000__) || defined(CONFIG_APUS)
  41 #include <asm/setup.h>
  42 #endif
  43
  44 #include <asm/io.h>
  45 #include <asm/uaccess.h>
  46 #include <asm/page.h>
  47 #include <asm/pgtable.h>
  48
  49 #include <linux/fb.h>
  50
  51     /*
  52      *  Frame buffer device initialization and setup routines
  53      */
  54
  55 #define FBPIXMAPSIZE    (1024 * 8)
  56
  57 static struct notifier_block *fb_notifier_list;
  58 struct fb_info *registered_fb[FB_MAX];
  59 int num_registered_fb;
  60
  61 /*
  62  * Helpers
  63  */
  64
  65 int fb_get_color_depth(struct fb_var_screeninfo *var)
  66 {
  67         if (var->green.length == var->blue.length &&
  68             var->green.length == var->red.length &&
  69             !var->green.offset && !var->blue.offset &&
  70             !var->red.offset)
  71                 return var->green.length;
  72         else
  73                 return (var->green.length + var->red.length +
  74                         var->blue.length);
  75 }
  76 EXPORT_SYMBOL(fb_get_color_depth);
  77
  78 /*
  79  * Data padding functions.
  80  */
  81 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
  82 {
  83         int i, j;
  84
  85         for (i = height; i--; ) {
  86                 /* s_pitch is a few bytes at the most, memcpy is suboptimal */
  87                 for (j = 0; j < s_pitch; j++)
  88                         dst[j] = src[j];
  89                 src += s_pitch;
  90                 dst += d_pitch;
  91         }
  92 }
  93 EXPORT_SYMBOL(fb_pad_aligned_buffer);
  94
  95 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
  96                                 u32 shift_high, u32 shift_low, u32 mod)
  97 {
  98         u8 mask = (u8) (0xfff << shift_high), tmp;
  99         int i, j;
 100
 101         for (i = height; i--; ) {
 102                 for (j = 0; j < idx; j++) {
 103                         tmp = dst[j];
 104                         tmp &= mask;
 105                         tmp |= *src >> shift_low;
 106                         dst[j] = tmp;
 107                         tmp = *src << shift_high;
 108                         dst[j+1] = tmp;
 109                         src++;
 110                 }
 111                 tmp = dst[idx];
 112                 tmp &= mask;
 113                 tmp |= *src >> shift_low;
 114                 dst[idx] = tmp;
 115                 if (shift_high < mod) {
 116                         tmp = *src << shift_high;
 117                         dst[idx+1] = tmp;
 118                 }
 119                 src++;
 120                 dst += d_pitch;
 121         }
 122 }
 123 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
 124
 125 /*
 126  * we need to lock this section since fb_cursor
 127  * may use fb_imageblit()
 128  */
 129 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
 130 {
 131         u32 align = buf->buf_align - 1, offset;
 132         char *addr = buf->addr;
 133
 134         /* If IO mapped, we need to sync before access, no sharing of
 135          * the pixmap is done
 136          */
 137         if (buf->flags & FB_PIXMAP_IO) {
 138                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 139                         info->fbops->fb_sync(info);
 140                 return addr;
 141         }
 142
 143         /* See if we fit in the remaining pixmap space */
 144         offset = buf->offset + align;
 145         offset &= ~align;
 146         if (offset + size > buf->size) {
 147                 /* We do not fit. In order to be able to re-use the buffer,
 148                  * we must ensure no asynchronous DMA'ing or whatever operation
 149                  * is in progress, we sync for that.
 150                  */
 151                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 152                         info->fbops->fb_sync(info);
 153                 offset = 0;
 154         }
 155         buf->offset = offset + size;
 156         addr += offset;
 157
 158         return addr;
 159 }
 160
 161 #ifdef CONFIG_LOGO
 162 #include <linux/linux_logo.h>
 163
 164 static inline unsigned safe_shift(unsigned d, int n)
 165 {
 166         return n < 0 ? d >> -n : d << n;
 167 }
 168
 169 static void fb_set_logocmap(struct fb_info *info,
 170                                    const struct linux_logo *logo)
 171 {
 172         struct fb_cmap palette_cmap;
 173         u16 palette_green[16];
 174         u16 palette_blue[16];
 175         u16 palette_red[16];
 176         int i, j, n;
 177         const unsigned char *clut = logo->clut;
 178
 179         palette_cmap.start = 0;
 180         palette_cmap.len = 16;
 181         palette_cmap.red = palette_red;
 182         palette_cmap.green = palette_green;
 183         palette_cmap.blue = palette_blue;
 184         palette_cmap.transp = NULL;
 185
 186         for (i = 0; i < logo->clutsize; i += n) {
 187                 n = logo->clutsize - i;
 188                 /* palette_cmap provides space for only 16 colors at once */
 189                 if (n > 16)
 190                         n = 16;
 191                 palette_cmap.start = 32 + i;
 192                 palette_cmap.len = n;
 193                 for (j = 0; j < n; ++j) {
 194                         palette_cmap.red[j] = clut[0] << 8 | clut[0];
 195                         palette_cmap.green[j] = clut[1] << 8 | clut[1];
 196                         palette_cmap.blue[j] = clut[2] << 8 | clut[2];
 197                         clut += 3;
 198                 }
 199                 fb_set_cmap(&palette_cmap, info);
 200         }
 201 }
 202
 203 static void  fb_set_logo_truepalette(struct fb_info *info,
 204                                             const struct linux_logo *logo,
 205                                             u32 *palette)
 206 {
 207         unsigned char mask[9] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
 208         unsigned char redmask, greenmask, bluemask;
 209         int redshift, greenshift, blueshift;
 210         int i;
 211         const unsigned char *clut = logo->clut;
 212
 213         /*
 214          * We have to create a temporary palette since console palette is only
 215          * 16 colors long.
 216          */
 217         /* Bug: Doesn't obey msb_right ... (who needs that?) */
 218         redmask   = mask[info->var.red.length   < 8 ? info->var.red.length   : 8];
 219         greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
 220         bluemask  = mask[info->var.blue.length  < 8 ? info->var.blue.length  : 8];
 221         redshift   = info->var.red.offset   - (8 - info->var.red.length);
 222         greenshift = info->var.green.offset - (8 - info->var.green.length);
 223         blueshift  = info->var.blue.offset  - (8 - info->var.blue.length);
 224
 225         for ( i = 0; i < logo->clutsize; i++) {
 226                 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
 227                                  safe_shift((clut[1] & greenmask), greenshift) |
 228                                  safe_shift((clut[2] & bluemask), blueshift));
 229                 clut += 3;
 230         }
 231 }
 232
 233 static void fb_set_logo_directpalette(struct fb_info *info,
 234                                              const struct linux_logo *logo,
 235                                              u32 *palette)
 236 {
 237         int redshift, greenshift, blueshift;
 238         int i;
 239
 240         redshift = info->var.red.offset;
 241         greenshift = info->var.green.offset;
 242         blueshift = info->var.blue.offset;
 243
 244         for (i = 32; i < logo->clutsize; i++)
 245                 palette[i] = i << redshift | i << greenshift | i << blueshift;
 246 }
 247
 248 static void fb_set_logo(struct fb_info *info,
 249                                const struct linux_logo *logo, u8 *dst,
 250                                int depth)
 251 {
 252         int i, j, k, fg = 1;
 253         const u8 *src = logo->data;
 254         u8 d, xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
 255
 256         if (fb_get_color_depth(&info->var) == 3)
 257                 fg = 7;
 258
 259         switch (depth) {
 260         case 4:
 261                 for (i = 0; i < logo->height; i++)
 262                         for (j = 0; j < logo->width; src++) {
 263                                 *dst++ = *src >> 4;
 264                                 j++;
 265                                 if (j < logo->width) {
 266                                         *dst++ = *src & 0x0f;
 267                                         j++;
 268                                 }
 269                         }
 270                 break;
 271         case 1:
 272                 for (i = 0; i < logo->height; i++) {
 273                         for (j = 0; j < logo->width; src++) {
 274                                 d = *src ^ xor;
 275                                 for (k = 7; k >= 0; k--) {
 276                                         *dst++ = ((d >> k) & 1) ? fg : 0;
 277                                         j++;
 278                                 }
 279                         }
 280                 }
 281                 break;
 282         }
 283 }
 284
 285 /*
 286  * Three (3) kinds of logo maps exist.  linux_logo_clut224 (>16 colors),
 287  * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors).  Depending on
 288  * the visual format and color depth of the framebuffer, the DAC, the
 289  * pseudo_palette, and the logo data will be adjusted accordingly.
 290  *
 291  * Case 1 - linux_logo_clut224:
 292  * Color exceeds the number of console colors (16), thus we set the hardware DAC
 293  * using fb_set_cmap() appropriately.  The "needs_cmapreset"  flag will be set.
 294  *
 295  * For visuals that require color info from the pseudo_palette, we also construct
 296  * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
 297  * will be set.
 298  *
 299  * Case 2 - linux_logo_vga16:
 300  * The number of colors just matches the console colors, thus there is no need
 301  * to set the DAC or the pseudo_palette.  However, the bitmap is packed, ie,
 302  * each byte contains color information for two pixels (upper and lower nibble).
 303  * To be consistent with fb_imageblit() usage, we therefore separate the two
 304  * nibbles into separate bytes. The "depth" flag will be set to 4.
 305  *
 306  * Case 3 - linux_logo_mono:
 307  * This is similar with Case 2.  Each byte contains information for 8 pixels.
 308  * We isolate each bit and expand each into a byte. The "depth" flag will
 309  * be set to 1.
 310  */
 311 static struct logo_data {
 312         int depth;
 313         int needs_directpalette;
 314         int needs_truepalette;
 315         int needs_cmapreset;
 316         const struct linux_logo *logo;
 317 } fb_logo;
 318
 319 int fb_prepare_logo(struct fb_info *info)
 320 {
 321         int depth = fb_get_color_depth(&info->var);
 322
 323         memset(&fb_logo, 0, sizeof(struct logo_data));
 324
 325         if (info->flags & FBINFO_MISC_TILEBLITTING)
 326                 return 0;
 327
 328         if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
 329                 depth = info->var.blue.length;
 330                 if (info->var.red.length < depth)
 331                         depth = info->var.red.length;
 332                 if (info->var.green.length < depth)
 333                         depth = info->var.green.length;
 334         }
 335
 336         if (depth >= 8) {
 337                 switch (info->fix.visual) {
 338                 case FB_VISUAL_TRUECOLOR:
 339                         fb_logo.needs_truepalette = 1;
 340                         break;
 341                 case FB_VISUAL_DIRECTCOLOR:
 342                         fb_logo.needs_directpalette = 1;
 343                         fb_logo.needs_cmapreset = 1;
 344                         break;
 345                 case FB_VISUAL_PSEUDOCOLOR:
 346                         fb_logo.needs_cmapreset = 1;
 347                         break;
 348                 }
 349         }
 350
 351         /* Return if no suitable logo was found */
 352         fb_logo.logo = fb_find_logo(depth);
 353
 354         if (!fb_logo.logo || fb_logo.logo->height > info->var.yres) {
 355                 fb_logo.logo = NULL;
 356                 return 0;
 357         }
 358         /* What depth we asked for might be different from what we get */
 359         if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
 360                 fb_logo.depth = 8;
 361         else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
 362                 fb_logo.depth = 4;
 363         else
 364                 fb_logo.depth = 1;
 365         return fb_logo.logo->height;
 366 }
 367
 368 int fb_show_logo(struct fb_info *info)
 369 {
 370         u32 *palette = NULL, *saved_pseudo_palette = NULL;
 371         unsigned char *logo_new = NULL;
 372         struct fb_image image;
 373         int x;
 374
 375         /* Return if the frame buffer is not mapped or suspended */
 376         if (fb_logo.logo == NULL || info->state != FBINFO_STATE_RUNNING)
 377                 return 0;
 378
 379         image.depth = 8;
 380         image.data = fb_logo.logo->data;
 381
 382         if (fb_logo.needs_cmapreset)
 383                 fb_set_logocmap(info, fb_logo.logo);
 384
 385         if (fb_logo.needs_truepalette ||
 386             fb_logo.needs_directpalette) {
 387                 palette = kmalloc(256 * 4, GFP_KERNEL);
 388                 if (palette == NULL)
 389                         return 0;
 390
 391                 if (fb_logo.needs_truepalette)
 392                         fb_set_logo_truepalette(info, fb_logo.logo, palette);
 393                 else
 394                         fb_set_logo_directpalette(info, fb_logo.logo, palette);
 395
 396                 saved_pseudo_palette = info->pseudo_palette;
 397                 info->pseudo_palette = palette;
 398         }
 399
 400         if (fb_logo.depth <= 4) {
 401                 logo_new = kmalloc(fb_logo.logo->width * fb_logo.logo->height,
 402                                    GFP_KERNEL);
 403                 if (logo_new == NULL) {
 404                         kfree(palette);
 405                         if (saved_pseudo_palette)
 406                                 info->pseudo_palette = saved_pseudo_palette;
 407                         return 0;
 408                 }
 409                 image.data = logo_new;
 410                 fb_set_logo(info, fb_logo.logo, logo_new, fb_logo.depth);
 411         }
 412
 413         image.width = fb_logo.logo->width;
 414         image.height = fb_logo.logo->height;
 415         image.dy = 0;
 416
 417         for (x = 0; x < num_online_cpus() * (fb_logo.logo->width + 8) &&
 418              x <= info->var.xres-fb_logo.logo->width; x += (fb_logo.logo->width + 8)) {
 419                 image.dx = x;
 420                 info->fbops->fb_imageblit(info, &image);
 421         }
 422
 423         kfree(palette);
 424         if (saved_pseudo_palette != NULL)
 425                 info->pseudo_palette = saved_pseudo_palette;
 426         kfree(logo_new);
 427         return fb_logo.logo->height;
 428 }
 429 #else
 430 int fb_prepare_logo(struct fb_info *info) { return 0; }
 431 int fb_show_logo(struct fb_info *info) { return 0; }
 432 #endif /* CONFIG_LOGO */
 433
 434 static int fbmem_read_proc(char *buf, char **start, off_t offset,
 435                            int len, int *eof, void *private)
 436 {
 437         struct fb_info **fi;
 438         int clen;
 439
 440         clen = 0;
 441         for (fi = registered_fb; fi < &registered_fb[FB_MAX] && len < 4000; fi++)
 442                 if (*fi)
 443                         clen += sprintf(buf + clen, "%d %s\n",
 444                                         (*fi)->node,
 445                                         (*fi)->fix.id);
 446         *start = buf + offset;
 447         if (clen > offset)
 448                 clen -= offset;
 449         else
 450                 clen = 0;
 451         return clen < len ? clen : len;
 452 }
 453
 454 static ssize_t
 455 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 456 {
 457         unsigned long p = *ppos;
 458         struct inode *inode = file->f_dentry->d_inode;
 459         int fbidx = iminor(inode);
 460         struct fb_info *info = registered_fb[fbidx];
 461         u32 *buffer, *dst;
 462         u32 __iomem *src;
 463         int c, i, cnt = 0, err = 0;
 464         unsigned long total_size;
 465
 466         if (!info || ! info->screen_base)
 467                 return -ENODEV;
 468
 469         if (info->state != FBINFO_STATE_RUNNING)
 470                 return -EPERM;
 471
 472         if (info->fbops->fb_read)
 473                 return info->fbops->fb_read(file, buf, count, ppos);
 474
 475         total_size = info->screen_size;
 476         if (total_size == 0)
 477                 total_size = info->fix.smem_len;
 478
 479         if (p >= total_size)
 480             return 0;
 481         if (count >= total_size)
 482             count = total_size;
 483         if (count + p > total_size)
 484                 count = total_size - p;
 485
 486         cnt = 0;
 487         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 488                          GFP_KERNEL);
 489         if (!buffer)
 490                 return -ENOMEM;
 491
 492         src = (u32 __iomem *) (info->screen_base + p);
 493
 494         if (info->fbops->fb_sync)
 495                 info->fbops->fb_sync(info);
 496
 497         while (count) {
 498                 c  = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 499                 dst = buffer;
 500                 for (i = c >> 2; i--; )
 501                         *dst++ = fb_readl(src++);
 502                 if (c & 3) {
 503                         u8 *dst8 = (u8 *) dst;
 504                         u8 __iomem *src8 = (u8 __iomem *) src;
 505
 506                         for (i = c & 3; i--;)
 507                                 *dst8++ = fb_readb(src8++);
 508
 509                         src = (u32 __iomem *) src8;
 510                 }
 511
 512                 if (copy_to_user(buf, buffer, c)) {
 513                         err = -EFAULT;
 514                         break;
 515                 }
 516                 *ppos += c;
 517                 buf += c;
 518                 cnt += c;
 519                 count -= c;
 520         }
 521
 522         kfree(buffer);
 523         return (err) ? err : cnt;
 524 }
 525
 526 static ssize_t
 527 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 528 {
 529         unsigned long p = *ppos;
 530         struct inode *inode = file->f_dentry->d_inode;
 531         int fbidx = iminor(inode);
 532         struct fb_info *info = registered_fb[fbidx];
 533         u32 *buffer, *src;
 534         u32 __iomem *dst;
 535         int c, i, cnt = 0, err;
 536         unsigned long total_size;
 537
 538         if (!info || !info->screen_base)
 539                 return -ENODEV;
 540
 541         if (info->state != FBINFO_STATE_RUNNING)
 542                 return -EPERM;
 543
 544         if (info->fbops->fb_write)
 545                 return info->fbops->fb_write(file, buf, count, ppos);
 546
 547         total_size = info->screen_size;
 548         if (total_size == 0)
 549                 total_size = info->fix.smem_len;
 550
 551         if (p > total_size)
 552             return -ENOSPC;
 553         if (count >= total_size)
 554             count = total_size;
 555         err = 0;
 556         if (count + p > total_size) {
 557             count = total_size - p;
 558             err = -ENOSPC;
 559         }
 560         cnt = 0;
 561         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 562                          GFP_KERNEL);
 563         if (!buffer)
 564                 return -ENOMEM;
 565
 566         dst = (u32 __iomem *) (info->screen_base + p);
 567
 568         if (info->fbops->fb_sync)
 569                 info->fbops->fb_sync(info);
 570
 571         while (count) {
 572                 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 573                 src = buffer;
 574                 if (copy_from_user(src, buf, c)) {
 575                         err = -EFAULT;
 576                         break;
 577                 }
 578                 for (i = c >> 2; i--; )
 579                         fb_writel(*src++, dst++);
 580                 if (c & 3) {
 581                         u8 *src8 = (u8 *) src;
 582                         u8 __iomem *dst8 = (u8 __iomem *) dst;
 583
 584                         for (i = c & 3; i--; )
 585                                 fb_writeb(*src8++, dst8++);
 586
 587                         dst = (u32 __iomem *) dst8;
 588                 }
 589                 *ppos += c;
 590                 buf += c;
 591                 cnt += c;
 592                 count -= c;
 593         }
 594         kfree(buffer);
 595
 596         return (err) ? err : cnt;
 597 }
 598
 599 #ifdef CONFIG_KMOD
 600 static void try_to_load(int fb)
 601 {
 602         request_module("fb%d", fb);
 603 }
 604 #endif /* CONFIG_KMOD */
 605
 606 int
 607 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
 608 {
 609         int xoffset = var->xoffset;
 610         int yoffset = var->yoffset;
 611         int err;
 612
 613         if (xoffset < 0 || yoffset < 0 || !info->fbops->fb_pan_display ||
 614             xoffset + info->var.xres > info->var.xres_virtual ||
 615             yoffset + info->var.yres > info->var.yres_virtual)
 616                 return -EINVAL;
 617         if ((err = info->fbops->fb_pan_display(var, info)))
 618                 return err;
 619         info->var.xoffset = var->xoffset;
 620         info->var.yoffset = var->yoffset;
 621         if (var->vmode & FB_VMODE_YWRAP)
 622                 info->var.vmode |= FB_VMODE_YWRAP;
 623         else
 624                 info->var.vmode &= ~FB_VMODE_YWRAP;
 625         return 0;
 626 }
 627
 628 int
 629 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
 630 {
 631         int err, flags = info->flags;
 632
 633         if (var->activate & FB_ACTIVATE_INV_MODE) {
 634                 struct fb_videomode mode1, mode2;
 635                 int ret = 0;
 636
 637                 fb_var_to_videomode(&mode1, var);
 638                 fb_var_to_videomode(&mode2, &info->var);
 639                 /* make sure we don't delete the videomode of current var */
 640                 ret = fb_mode_is_equal(&mode1, &mode2);
 641
 642                 if (!ret) {
 643                     struct fb_event event;
 644
 645                     event.info = info;
 646                     event.data = &mode1;
 647                     ret = notifier_call_chain(&fb_notifier_list,
 648                                               FB_EVENT_MODE_DELETE, &event);
 649                 }
 650
 651                 if (!ret)
 652                     fb_delete_videomode(&mode1, &info->modelist);
 653
 654                 return ret;
 655         }
 656
 657         if ((var->activate & FB_ACTIVATE_FORCE) ||
 658             memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
 659                 if (!info->fbops->fb_check_var) {
 660                         *var = info->var;
 661                         return 0;
 662                 }
 663
 664                 if ((err = info->fbops->fb_check_var(var, info)))
 665                         return err;
 666
 667                 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
 668                         struct fb_videomode mode;
 669                         int err = 0;
 670
 671                         info->var = *var;
 672                         if (info->fbops->fb_set_par)
 673                                 info->fbops->fb_set_par(info);
 674
 675                         fb_pan_display(info, &info->var);
 676
 677                         fb_set_cmap(&info->cmap, info);
 678
 679                         fb_var_to_videomode(&mode, &info->var);
 680
 681                         if (info->modelist.prev && info->modelist.next &&
 682                             !list_empty(&info->modelist))
 683                                 err = fb_add_videomode(&mode, &info->modelist);
 684
 685                         if (!err && (flags & FBINFO_MISC_USEREVENT)) {
 686                                 struct fb_event event;
 687
 688                                 info->flags &= ~FBINFO_MISC_USEREVENT;
 689                                 event.info = info;
 690                                 notifier_call_chain(&fb_notifier_list,
 691                                                     FB_EVENT_MODE_CHANGE,
 692                                                     &event);
 693                         }
 694                 }
 695         }
 696         return 0;
 697 }
 698
 699 int
 700 fb_blank(struct fb_info *info, int blank)
 701 {
 702         int ret = -EINVAL;
 703
 704         if (blank > FB_BLANK_POWERDOWN)
 705                 blank = FB_BLANK_POWERDOWN;
 706
 707         if (info->fbops->fb_blank)
 708                 ret = info->fbops->fb_blank(blank, info);
 709
 710         if (!ret) {
 711                 struct fb_event event;
 712
 713                 event.info = info;
 714                 event.data = &blank;
 715                 notifier_call_chain(&fb_notifier_list, FB_EVENT_BLANK, &event);
 716         }
 717
 718         return ret;
 719 }
 720
 721 static int
 722 fb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
 723          unsigned long arg)
 724 {
 725         int fbidx = iminor(inode);
 726         struct fb_info *info = registered_fb[fbidx];
 727         struct fb_ops *fb = info->fbops;
 728         struct fb_var_screeninfo var;
 729         struct fb_fix_screeninfo fix;
 730         struct fb_con2fbmap con2fb;
 731         struct fb_cmap_user cmap;
 732         struct fb_event event;
 733         void __user *argp = (void __user *)arg;
 734         int i;
 735
 736         if (!fb)
 737                 return -ENODEV;
 738         switch (cmd) {
 739         case FBIOGET_VSCREENINFO:
 740                 return copy_to_user(argp, &info->var,
 741                                     sizeof(var)) ? -EFAULT : 0;
 742         case FBIOPUT_VSCREENINFO:
 743                 if (copy_from_user(&var, argp, sizeof(var)))
 744                         return -EFAULT;
 745                 acquire_console_sem();
 746                 info->flags |= FBINFO_MISC_USEREVENT;
 747                 i = fb_set_var(info, &var);
 748                 info->flags &= ~FBINFO_MISC_USEREVENT;
 749                 release_console_sem();
 750                 if (i) return i;
 751                 if (copy_to_user(argp, &var, sizeof(var)))
 752                         return -EFAULT;
 753                 return 0;
 754         case FBIOGET_FSCREENINFO:
 755                 return copy_to_user(argp, &info->fix,
 756                                     sizeof(fix)) ? -EFAULT : 0;
 757         case FBIOPUTCMAP:
 758                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
 759                         return -EFAULT;
 760                 return (fb_set_user_cmap(&cmap, info));
 761         case FBIOGETCMAP:
 762                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
 763                         return -EFAULT;
 764                 return fb_cmap_to_user(&info->cmap, &cmap);
 765         case FBIOPAN_DISPLAY:
 766                 if (copy_from_user(&var, argp, sizeof(var)))
 767                         return -EFAULT;
 768                 acquire_console_sem();
 769                 i = fb_pan_display(info, &var);
 770                 release_console_sem();
 771                 if (i)
 772                         return i;
 773                 if (copy_to_user(argp, &var, sizeof(var)))
 774                         return -EFAULT;
 775                 return 0;
 776         case FBIO_CURSOR:
 777                 return -EINVAL;
 778         case FBIOGET_CON2FBMAP:
 779                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
 780                         return -EFAULT;
 781                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
 782                     return -EINVAL;
 783                 con2fb.framebuffer = -1;
 784                 event.info = info;
 785                 event.data = &con2fb;
 786                 notifier_call_chain(&fb_notifier_list,
 787                                     FB_EVENT_GET_CONSOLE_MAP, &event);
 788                 return copy_to_user(argp, &con2fb,
 789                                     sizeof(con2fb)) ? -EFAULT : 0;
 790         case FBIOPUT_CON2FBMAP:
 791                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
 792                         return - EFAULT;
 793                 if (con2fb.console < 0 || con2fb.console > MAX_NR_CONSOLES)
 794                     return -EINVAL;
 795                 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
 796                     return -EINVAL;
 797 #ifdef CONFIG_KMOD
 798                 if (!registered_fb[con2fb.framebuffer])
 799                     try_to_load(con2fb.framebuffer);
 800 #endif /* CONFIG_KMOD */
 801                 if (!registered_fb[con2fb.framebuffer])
 802                     return -EINVAL;
 803                 event.info = info;
 804                 event.data = &con2fb;
 805                 return notifier_call_chain(&fb_notifier_list,
 806                                            FB_EVENT_SET_CONSOLE_MAP,
 807                                            &event);
 808         case FBIOBLANK:
 809                 acquire_console_sem();
 810                 info->flags |= FBINFO_MISC_USEREVENT;
 811                 i = fb_blank(info, arg);
 812                 info->flags &= ~FBINFO_MISC_USEREVENT;
 813                 release_console_sem();
 814                 return i;
 815         default:
 816                 if (fb->fb_ioctl == NULL)
 817                         return -EINVAL;
 818                 return fb->fb_ioctl(inode, file, cmd, arg, info);
 819         }
 820 }
 821
 822 #ifdef CONFIG_COMPAT
 823 static long
 824 fb_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 825 {
 826         int fbidx = iminor(file->f_dentry->d_inode);
 827         struct fb_info *info = registered_fb[fbidx];
 828         struct fb_ops *fb = info->fbops;
 829         long ret;
 830
 831         if (fb->fb_compat_ioctl == NULL)
 832                 return -ENOIOCTLCMD;
 833         lock_kernel();
 834         ret = fb->fb_compat_ioctl(file, cmd, arg, info);
 835         unlock_kernel();
 836         return ret;
 837 }
 838 #endif
 839
 840 static int
 841 fb_mmap(struct file *file, struct vm_area_struct * vma)
 842 {
 843         int fbidx = iminor(file->f_dentry->d_inode);
 844         struct fb_info *info = registered_fb[fbidx];
 845         struct fb_ops *fb = info->fbops;
 846         unsigned long off;
 847 #if !defined(__sparc__) || defined(__sparc_v9__)
 848         unsigned long start;
 849         u32 len;
 850 #endif
 851
 852         if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
 853                 return -EINVAL;
 854         off = vma->vm_pgoff << PAGE_SHIFT;
 855         if (!fb)
 856                 return -ENODEV;
 857         if (fb->fb_mmap) {
 858                 int res;
 859                 lock_kernel();
 860                 res = fb->fb_mmap(info, file, vma);
 861                 unlock_kernel();
 862                 return res;
 863         }
 864
 865 #if defined(__sparc__) && !defined(__sparc_v9__)
 866         /* Should never get here, all fb drivers should have their own
 867            mmap routines */
 868         return -EINVAL;
 869 #else
 870         /* !sparc32... */
 871         lock_kernel();
 872
 873         /* frame buffer memory */
 874         start = info->fix.smem_start;
 875         len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
 876         if (off >= len) {
 877                 /* memory mapped io */
 878                 off -= len;
 879                 if (info->var.accel_flags) {
 880                         unlock_kernel();
 881                         return -EINVAL;
 882                 }
 883                 start = info->fix.mmio_start;
 884                 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
 885         }
 886         unlock_kernel();
 887         start &= PAGE_MASK;
 888         if ((vma->vm_end - vma->vm_start + off) > len)
 889                 return -EINVAL;
 890         off += start;
 891         vma->vm_pgoff = off >> PAGE_SHIFT;
 892         /* This is an IO map - tell maydump to skip this VMA */
 893         vma->vm_flags |= VM_IO | VM_RESERVED;
 894 #if defined(__sparc_v9__)
 895         if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
 896                                 vma->vm_end - vma->vm_start, vma->vm_page_prot))
 897                 return -EAGAIN;
 898 #else
 899 #if defined(__mc68000__)
 900 #if defined(CONFIG_SUN3)
 901         pgprot_val(vma->vm_page_prot) |= SUN3_PAGE_NOCACHE;
 902 #elif defined(CONFIG_MMU)
 903         if (CPU_IS_020_OR_030)
 904                 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE030;
 905         if (CPU_IS_040_OR_060) {
 906                 pgprot_val(vma->vm_page_prot) &= _CACHEMASK040;
 907                 /* Use no-cache mode, serialized */
 908                 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE_S;
 909         }
 910 #endif
 911 #elif defined(__powerpc__)
 912         vma->vm_page_prot = phys_mem_access_prot(file, off,
 913                                                  vma->vm_end - vma->vm_start,
 914                                                  vma->vm_page_prot);
 915 #elif defined(__alpha__)
 916         /* Caching is off in the I/O space quadrant by design.  */
 917 #elif defined(__i386__) || defined(__x86_64__)
 918         if (boot_cpu_data.x86 > 3)
 919                 pgprot_val(vma->vm_page_prot) |= _PAGE_PCD;
 920 #elif defined(__mips__)
 921         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 922 #elif defined(__hppa__)
 923         pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
 924 #elif defined(__arm__) || defined(__sh__) || defined(__m32r__)
 925         vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
 926 #elif defined(__ia64__)
 927         if (efi_range_is_wc(vma->vm_start, vma->vm_end - vma->vm_start))
 928                 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
 929         else
 930                 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 931 #else
 932 #warning What do we have to do here??
 933 #endif
 934         if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
 935                              vma->vm_end - vma->vm_start, vma->vm_page_prot))
 936                 return -EAGAIN;
 937 #endif /* !__sparc_v9__ */
 938         return 0;
 939 #endif /* !sparc32 */
 940 }
 941
 942 static int
 943 fb_open(struct inode *inode, struct file *file)
 944 {
 945         int fbidx = iminor(inode);
 946         struct fb_info *info;
 947         int res = 0;
 948
 949         if (fbidx >= FB_MAX)
 950                 return -ENODEV;
 951 #ifdef CONFIG_KMOD
 952         if (!(info = registered_fb[fbidx]))
 953                 try_to_load(fbidx);
 954 #endif /* CONFIG_KMOD */
 955         if (!(info = registered_fb[fbidx]))
 956                 return -ENODEV;
 957         if (!try_module_get(info->fbops->owner))
 958                 return -ENODEV;
 959         if (info->fbops->fb_open) {
 960                 res = info->fbops->fb_open(info,1);
 961                 if (res)
 962                         module_put(info->fbops->owner);
 963         }
 964         return res;
 965 }
 966
 967 static int
 968 fb_release(struct inode *inode, struct file *file)
 969 {
 970         int fbidx = iminor(inode);
 971         struct fb_info *info;
 972
 973         lock_kernel();
 974         info = registered_fb[fbidx];
 975         if (info->fbops->fb_release)
 976                 info->fbops->fb_release(info,1);
 977         module_put(info->fbops->owner);
 978         unlock_kernel();
 979         return 0;
 980 }
 981
 982 static struct file_operations fb_fops = {
 983         .owner =        THIS_MODULE,
 984         .read =         fb_read,
 985         .write =        fb_write,
 986         .ioctl =        fb_ioctl,
 987 #ifdef CONFIG_COMPAT
 988         .compat_ioctl = fb_compat_ioctl,
 989 #endif
 990         .mmap =         fb_mmap,
 991         .open =         fb_open,
 992         .release =      fb_release,
 993 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
 994         .get_unmapped_area = get_fb_unmapped_area,
 995 #endif
 996 };
 997
 998 static struct class *fb_class;
 999
1000 /**
1001  *      register_framebuffer - registers a frame buffer device
1002  *      @fb_info: frame buffer info structure
1003  *
1004  *      Registers a frame buffer device @fb_info.
1005  *
1006  *      Returns negative errno on error, or zero for success.
1007  *
1008  */
1009
1010 int
1011 register_framebuffer(struct fb_info *fb_info)
1012 {
1013         int i;
1014         struct fb_event event;
1015
1016         if (num_registered_fb == FB_MAX)
1017                 return -ENXIO;
1018         num_registered_fb++;
1019         for (i = 0 ; i < FB_MAX; i++)
1020                 if (!registered_fb[i])
1021                         break;
1022         fb_info->node = i;
1023
1024         fb_info->class_device = class_device_create(fb_class, MKDEV(FB_MAJOR, i),
1025                                     fb_info->device, "fb%d", i);
1026         if (IS_ERR(fb_info->class_device)) {
1027                 /* Not fatal */
1028                 printk(KERN_WARNING "Unable to create class_device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->class_device));
1029                 fb_info->class_device = NULL;
1030         } else
1031                 fb_init_class_device(fb_info);
1032
1033         if (fb_info->pixmap.addr == NULL) {
1034                 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1035                 if (fb_info->pixmap.addr) {
1036                         fb_info->pixmap.size = FBPIXMAPSIZE;
1037                         fb_info->pixmap.buf_align = 1;
1038                         fb_info->pixmap.scan_align = 1;
1039                         fb_info->pixmap.access_align = 32;
1040                         fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1041                 }
1042         }
1043         fb_info->pixmap.offset = 0;
1044
1045         if (!fb_info->modelist.prev ||
1046             !fb_info->modelist.next ||
1047             list_empty(&fb_info->modelist)) {
1048                 struct fb_videomode mode;
1049
1050                 INIT_LIST_HEAD(&fb_info->modelist);
1051                 fb_var_to_videomode(&mode, &fb_info->var);
1052                 fb_add_videomode(&mode, &fb_info->modelist);
1053         }
1054
1055         registered_fb[i] = fb_info;
1056
1057         devfs_mk_cdev(MKDEV(FB_MAJOR, i),
1058                         S_IFCHR | S_IRUGO | S_IWUGO, "fb/%d", i);
1059         event.info = fb_info;
1060         notifier_call_chain(&fb_notifier_list,
1061                             FB_EVENT_FB_REGISTERED, &event);
1062         return 0;
1063 }
1064
1065
1066 /**
1067  *      unregister_framebuffer - releases a frame buffer device
1068  *      @fb_info: frame buffer info structure
1069  *
1070  *      Unregisters a frame buffer device @fb_info.
1071  *
1072  *      Returns negative errno on error, or zero for success.
1073  *
1074  */
1075
1076 int
1077 unregister_framebuffer(struct fb_info *fb_info)
1078 {
1079         int i;
1080
1081         i = fb_info->node;
1082         if (!registered_fb[i])
1083                 return -EINVAL;
1084         devfs_remove("fb/%d", i);
1085
1086         if (fb_info->pixmap.addr && (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1087                 kfree(fb_info->pixmap.addr);
1088         fb_destroy_modelist(&fb_info->modelist);
1089         registered_fb[i]=NULL;
1090         num_registered_fb--;
1091         fb_cleanup_class_device(fb_info);
1092         class_device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1093         return 0;
1094 }
1095
1096 /**
1097  *      fb_register_client - register a client notifier
1098  *      @nb: notifier block to callback on events
1099  */
1100 int fb_register_client(struct notifier_block *nb)
1101 {
1102         return notifier_chain_register(&fb_notifier_list, nb);
1103 }
1104
1105 /**
1106  *      fb_unregister_client - unregister a client notifier
1107  *      @nb: notifier block to callback on events
1108  */
1109 int fb_unregister_client(struct notifier_block *nb)
1110 {
1111         return notifier_chain_unregister(&fb_notifier_list, nb);
1112 }
1113
1114 /**
1115  *      fb_set_suspend - low level driver signals suspend
1116  *      @info: framebuffer affected
1117  *      @state: 0 = resuming, !=0 = suspending
1118  *
1119  *      This is meant to be used by low level drivers to
1120  *      signal suspend/resume to the core & clients.
1121  *      It must be called with the console semaphore held
1122  */
1123 void fb_set_suspend(struct fb_info *info, int state)
1124 {
1125         struct fb_event event;
1126
1127         event.info = info;
1128         if (state) {
1129                 notifier_call_chain(&fb_notifier_list, FB_EVENT_SUSPEND, &event);
1130                 info->state = FBINFO_STATE_SUSPENDED;
1131         } else {
1132                 info->state = FBINFO_STATE_RUNNING;
1133                 notifier_call_chain(&fb_notifier_list, FB_EVENT_RESUME, &event);
1134         }
1135 }
1136
1137 /**
1138  *      fbmem_init - init frame buffer subsystem
1139  *
1140  *      Initialize the frame buffer subsystem.
1141  *
1142  *      NOTE: This function is _only_ to be called by drivers/char/mem.c.
1143  *
1144  */
1145
1146 static int __init
1147 fbmem_init(void)
1148 {
1149         create_proc_read_entry("fb", 0, NULL, fbmem_read_proc, NULL);
1150
1151         devfs_mk_dir("fb");
1152         if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1153                 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1154
1155         fb_class = class_create(THIS_MODULE, "graphics");
1156         if (IS_ERR(fb_class)) {
1157                 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1158                 fb_class = NULL;
1159         }
1160         return 0;
1161 }
1162
1163 #ifdef MODULE
1164 module_init(fbmem_init);
1165 static void __exit
1166 fbmem_exit(void)
1167 {
1168         class_destroy(fb_class);
1169         unregister_chrdev(FB_MAJOR, "fb");
1170 }
1171
1172 module_exit(fbmem_exit);
1173 MODULE_LICENSE("GPL");
1174 MODULE_DESCRIPTION("Framebuffer base");
1175 #else
1176 subsys_initcall(fbmem_init);
1177 #endif
1178
1179 int fb_new_modelist(struct fb_info *info)
1180 {
1181         struct fb_event event;
1182         struct fb_var_screeninfo var = info->var;
1183         struct list_head *pos, *n;
1184         struct fb_modelist *modelist;
1185         struct fb_videomode *m, mode;
1186         int err = 1;
1187
1188         list_for_each_safe(pos, n, &info->modelist) {
1189                 modelist = list_entry(pos, struct fb_modelist, list);
1190                 m = &modelist->mode;
1191                 fb_videomode_to_var(&var, m);
1192                 var.activate = FB_ACTIVATE_TEST;
1193                 err = fb_set_var(info, &var);
1194                 fb_var_to_videomode(&mode, &var);
1195                 if (err || !fb_mode_is_equal(m, &mode)) {
1196                         list_del(pos);
1197                         kfree(pos);
1198                 }
1199         }
1200
1201         err = 1;
1202
1203         if (!list_empty(&info->modelist)) {
1204                 event.info = info;
1205                 err = notifier_call_chain(&fb_notifier_list,
1206                                            FB_EVENT_NEW_MODELIST,
1207                                            &event);
1208         }
1209
1210         return err;
1211 }
1212
1213 static char *video_options[FB_MAX];
1214 static int ofonly;
1215
1216 extern const char *global_mode_option;
1217
1218 /**
1219  * fb_get_options - get kernel boot parameters
1220  * @name:   framebuffer name as it would appear in
1221  *          the boot parameter line
1222  *          (video=<name>:<options>)
1223  * @option: the option will be stored here
1224  *
1225  * NOTE: Needed to maintain backwards compatibility
1226  */
1227 int fb_get_options(char *name, char **option)
1228 {
1229         char *opt, *options = NULL;
1230         int opt_len, retval = 0;
1231         int name_len = strlen(name), i;
1232
1233         if (name_len && ofonly && strncmp(name, "offb", 4))
1234                 retval = 1;
1235
1236         if (name_len && !retval) {
1237                 for (i = 0; i < FB_MAX; i++) {
1238                         if (video_options[i] == NULL)
1239                                 continue;
1240                         opt_len = strlen(video_options[i]);
1241                         if (!opt_len)
1242                                 continue;
1243                         opt = video_options[i];
1244                         if (!strncmp(name, opt, name_len) &&
1245                             opt[name_len] == ':')
1246                                 options = opt + name_len + 1;
1247                 }
1248         }
1249         if (options && !strncmp(options, "off", 3))
1250                 retval = 1;
1251
1252         if (option)
1253                 *option = options;
1254
1255         return retval;
1256 }
1257
1258 /**
1259  *      video_setup - process command line options
1260  *      @options: string of options
1261  *
1262  *      Process command line options for frame buffer subsystem.
1263  *
1264  *      NOTE: This function is a __setup and __init function.
1265  *            It only stores the options.  Drivers have to call
1266  *            fb_get_options() as necessary.
1267  *
1268  *      Returns zero.
1269  *
1270  */
1271 static int __init video_setup(char *options)
1272 {
1273         int i, global = 0;
1274
1275         if (!options || !*options)
1276                 global = 1;
1277
1278         if (!global && !strncmp(options, "ofonly", 6)) {
1279                 ofonly = 1;
1280                 global = 1;
1281         }
1282
1283         if (!global && !strstr(options, "fb:")) {
1284                 global_mode_option = options;
1285                 global = 1;
1286         }
1287
1288         if (!global) {
1289                 for (i = 0; i < FB_MAX; i++) {
1290                         if (video_options[i] == NULL) {
1291                                 video_options[i] = options;
1292                                 break;
1293                         }
1294
1295                 }
1296         }
1297
1298         return 0;
1299 }
1300 __setup("video=", video_setup);
1301
1302     /*
1303      *  Visible symbols for modules
1304      */
1305
1306 EXPORT_SYMBOL(register_framebuffer);
1307 EXPORT_SYMBOL(unregister_framebuffer);
1308 EXPORT_SYMBOL(num_registered_fb);
1309 EXPORT_SYMBOL(registered_fb);
1310 EXPORT_SYMBOL(fb_prepare_logo);
1311 EXPORT_SYMBOL(fb_show_logo);
1312 EXPORT_SYMBOL(fb_set_var);
1313 EXPORT_SYMBOL(fb_blank);
1314 EXPORT_SYMBOL(fb_pan_display);
1315 EXPORT_SYMBOL(fb_get_buffer_offset);
1316 EXPORT_SYMBOL(fb_set_suspend);
1317 EXPORT_SYMBOL(fb_register_client);
1318 EXPORT_SYMBOL(fb_unregister_client);
1319 EXPORT_SYMBOL(fb_get_options);
1320 EXPORT_SYMBOL(fb_new_modelist);
1321
1322 MODULE_LICENSE("GPL");