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