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_sysmove_buf_aligned(struct fb_info *info, struct fb_pixmap *buf,
  82                             u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch,
  83                             u32 height)
  84 {
  85         int i;
  86
  87         for (i = height; i--; ) {
  88                 memcpy(dst, src, s_pitch);
  89                 src += s_pitch;
  90                 dst += d_pitch;
  91         }
  92 }
  93 EXPORT_SYMBOL(fb_sysmove_buf_aligned);
  94
  95 void fb_sysmove_buf_unaligned(struct fb_info *info, struct fb_pixmap *buf,
  96                               u8 *dst, u32 d_pitch, u8 *src, u32 idx,
  97                               u32 height, u32 shift_high, u32 shift_low,
  98                               u32 mod)
  99 {
 100         u8 mask = (u8) (0xfff << shift_high), tmp;
 101         int i, j;
 102
 103         for (i = height; i--; ) {
 104                 for (j = 0; j < idx; j++) {
 105                         tmp = dst[j];
 106                         tmp &= mask;
 107                         tmp |= *src >> shift_low;
 108                         dst[j] = tmp;
 109                         tmp = *src << shift_high;
 110                         dst[j+1] = tmp;
 111                         src++;
 112                 }
 113                 tmp = dst[idx];
 114                 tmp &= mask;
 115                 tmp |= *src >> shift_low;
 116                 dst[idx] = tmp;
 117                 if (shift_high < mod) {
 118                         tmp = *src << shift_high;
 119                         dst[idx+1] = tmp;
 120                 }
 121                 src++;
 122                 dst += d_pitch;
 123         }
 124 }
 125 EXPORT_SYMBOL(fb_sysmove_buf_unaligned);
 126
 127 /*
 128  * we need to lock this section since fb_cursor
 129  * may use fb_imageblit()
 130  */
 131 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
 132 {
 133         u32 align = buf->buf_align - 1, offset;
 134         char *addr = buf->addr;
 135
 136         /* If IO mapped, we need to sync before access, no sharing of
 137          * the pixmap is done
 138          */
 139         if (buf->flags & FB_PIXMAP_IO) {
 140                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 141                         info->fbops->fb_sync(info);
 142                 return addr;
 143         }
 144
 145         /* See if we fit in the remaining pixmap space */
 146         offset = buf->offset + align;
 147         offset &= ~align;
 148         if (offset + size > buf->size) {
 149                 /* We do not fit. In order to be able to re-use the buffer,
 150                  * we must ensure no asynchronous DMA'ing or whatever operation
 151                  * is in progress, we sync for that.
 152                  */
 153                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 154                         info->fbops->fb_sync(info);
 155                 offset = 0;
 156         }
 157         buf->offset = offset + size;
 158         addr += offset;
 159
 160         return addr;
 161 }
 162
 163 #ifdef CONFIG_LOGO
 164 #include <linux/linux_logo.h>
 165
 166 static inline unsigned safe_shift(unsigned d, int n)
 167 {
 168         return n < 0 ? d >> -n : d << n;
 169 }
 170
 171 static void fb_set_logocmap(struct fb_info *info,
 172                                    const struct linux_logo *logo)
 173 {
 174         struct fb_cmap palette_cmap;
 175         u16 palette_green[16];
 176         u16 palette_blue[16];
 177         u16 palette_red[16];
 178         int i, j, n;
 179         const unsigned char *clut = logo->clut;
 180
 181         palette_cmap.start = 0;
 182         palette_cmap.len = 16;
 183         palette_cmap.red = palette_red;
 184         palette_cmap.green = palette_green;
 185         palette_cmap.blue = palette_blue;
 186         palette_cmap.transp = NULL;
 187
 188         for (i = 0; i < logo->clutsize; i += n) {
 189                 n = logo->clutsize - i;
 190                 /* palette_cmap provides space for only 16 colors at once */
 191                 if (n > 16)
 192                         n = 16;
 193                 palette_cmap.start = 32 + i;
 194                 palette_cmap.len = n;
 195                 for (j = 0; j < n; ++j) {
 196                         palette_cmap.red[j] = clut[0] << 8 | clut[0];
 197                         palette_cmap.green[j] = clut[1] << 8 | clut[1];
 198                         palette_cmap.blue[j] = clut[2] << 8 | clut[2];
 199                         clut += 3;
 200                 }
 201                 fb_set_cmap(&palette_cmap, info);
 202         }
 203 }
 204
 205 static void  fb_set_logo_truepalette(struct fb_info *info,
 206                                             const struct linux_logo *logo,
 207                                             u32 *palette)
 208 {
 209         unsigned char mask[9] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
 210         unsigned char redmask, greenmask, bluemask;
 211         int redshift, greenshift, blueshift;
 212         int i;
 213         const unsigned char *clut = logo->clut;
 214
 215         /*
 216          * We have to create a temporary palette since console palette is only
 217          * 16 colors long.
 218          */
 219         /* Bug: Doesn't obey msb_right ... (who needs that?) */
 220         redmask   = mask[info->var.red.length   < 8 ? info->var.red.length   : 8];
 221         greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
 222         bluemask  = mask[info->var.blue.length  < 8 ? info->var.blue.length  : 8];
 223         redshift   = info->var.red.offset   - (8 - info->var.red.length);
 224         greenshift = info->var.green.offset - (8 - info->var.green.length);
 225         blueshift  = info->var.blue.offset  - (8 - info->var.blue.length);
 226
 227         for ( i = 0; i < logo->clutsize; i++) {
 228                 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
 229                                  safe_shift((clut[1] & greenmask), greenshift) |
 230                                  safe_shift((clut[2] & bluemask), blueshift));
 231                 clut += 3;
 232         }
 233 }
 234
 235 static void fb_set_logo_directpalette(struct fb_info *info,
 236                                              const struct linux_logo *logo,
 237                                              u32 *palette)
 238 {
 239         int redshift, greenshift, blueshift;
 240         int i;
 241
 242         redshift = info->var.red.offset;
 243         greenshift = info->var.green.offset;
 244         blueshift = info->var.blue.offset;
 245
 246         for (i = 32; i < logo->clutsize; i++)
 247                 palette[i] = i << redshift | i << greenshift | i << blueshift;
 248 }
 249
 250 static void fb_set_logo(struct fb_info *info,
 251                                const struct linux_logo *logo, u8 *dst,
 252                                int depth)
 253 {
 254         int i, j, k, fg = 1;
 255         const u8 *src = logo->data;
 256         u8 d, xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
 257
 258         if (fb_get_color_depth(&info->var) == 3)
 259                 fg = 7;
 260
 261         switch (depth) {
 262         case 4:
 263                 for (i = 0; i < logo->height; i++)
 264                         for (j = 0; j < logo->width; src++) {
 265                                 *dst++ = *src >> 4;
 266                                 j++;
 267                                 if (j < logo->width) {
 268                                         *dst++ = *src & 0x0f;
 269                                         j++;
 270                                 }
 271                         }
 272                 break;
 273         case 1:
 274                 for (i = 0; i < logo->height; i++) {
 275                         for (j = 0; j < logo->width; src++) {
 276                                 d = *src ^ xor;
 277                                 for (k = 7; k >= 0; k--) {
 278                                         *dst++ = ((d >> k) & 1) ? fg : 0;
 279                                         j++;
 280                                 }
 281                         }
 282                 }
 283                 break;
 284         }
 285 }
 286
 287 /*
 288  * Three (3) kinds of logo maps exist.  linux_logo_clut224 (>16 colors),
 289  * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors).  Depending on
 290  * the visual format and color depth of the framebuffer, the DAC, the
 291  * pseudo_palette, and the logo data will be adjusted accordingly.
 292  *
 293  * Case 1 - linux_logo_clut224:
 294  * Color exceeds the number of console colors (16), thus we set the hardware DAC
 295  * using fb_set_cmap() appropriately.  The "needs_cmapreset"  flag will be set.
 296  *
 297  * For visuals that require color info from the pseudo_palette, we also construct
 298  * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
 299  * will be set.
 300  *
 301  * Case 2 - linux_logo_vga16:
 302  * The number of colors just matches the console colors, thus there is no need
 303  * to set the DAC or the pseudo_palette.  However, the bitmap is packed, ie,
 304  * each byte contains color information for two pixels (upper and lower nibble).
 305  * To be consistent with fb_imageblit() usage, we therefore separate the two
 306  * nibbles into separate bytes. The "depth" flag will be set to 4.
 307  *
 308  * Case 3 - linux_logo_mono:
 309  * This is similar with Case 2.  Each byte contains information for 8 pixels.
 310  * We isolate each bit and expand each into a byte. The "depth" flag will
 311  * be set to 1.
 312  */
 313 static struct logo_data {
 314         int depth;
 315         int needs_directpalette;
 316         int needs_truepalette;
 317         int needs_cmapreset;
 318         const struct linux_logo *logo;
 319 } fb_logo;
 320
 321 int fb_prepare_logo(struct fb_info *info)
 322 {
 323         int depth = fb_get_color_depth(&info->var);
 324
 325         memset(&fb_logo, 0, sizeof(struct logo_data));
 326
 327         if (info->flags & FBINFO_MISC_TILEBLITTING)
 328                 return 0;
 329
 330         if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
 331                 depth = info->var.blue.length;
 332                 if (info->var.red.length < depth)
 333                         depth = info->var.red.length;
 334                 if (info->var.green.length < depth)
 335                         depth = info->var.green.length;
 336         }
 337
 338         if (depth >= 8) {
 339                 switch (info->fix.visual) {
 340                 case FB_VISUAL_TRUECOLOR:
 341                         fb_logo.needs_truepalette = 1;
 342                         break;
 343                 case FB_VISUAL_DIRECTCOLOR:
 344                         fb_logo.needs_directpalette = 1;
 345                         fb_logo.needs_cmapreset = 1;
 346                         break;
 347                 case FB_VISUAL_PSEUDOCOLOR:
 348                         fb_logo.needs_cmapreset = 1;
 349                         break;
 350                 }
 351         }
 352
 353         /* Return if no suitable logo was found */
 354         fb_logo.logo = fb_find_logo(depth);
 355
 356         if (!fb_logo.logo || fb_logo.logo->height > info->var.yres) {
 357                 fb_logo.logo = NULL;
 358                 return 0;
 359         }
 360         /* What depth we asked for might be different from what we get */
 361         if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
 362                 fb_logo.depth = 8;
 363         else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
 364                 fb_logo.depth = 4;
 365         else
 366                 fb_logo.depth = 1;
 367         return fb_logo.logo->height;
 368 }
 369
 370 int fb_show_logo(struct fb_info *info)
 371 {
 372         u32 *palette = NULL, *saved_pseudo_palette = NULL;
 373         unsigned char *logo_new = NULL;
 374         struct fb_image image;
 375         int x;
 376
 377         /* Return if the frame buffer is not mapped or suspended */
 378         if (fb_logo.logo == NULL || info->state != FBINFO_STATE_RUNNING)
 379                 return 0;
 380
 381         image.depth = 8;
 382         image.data = fb_logo.logo->data;
 383
 384         if (fb_logo.needs_cmapreset)
 385                 fb_set_logocmap(info, fb_logo.logo);
 386
 387         if (fb_logo.needs_truepalette ||
 388             fb_logo.needs_directpalette) {
 389                 palette = kmalloc(256 * 4, GFP_KERNEL);
 390                 if (palette == NULL)
 391                         return 0;
 392
 393                 if (fb_logo.needs_truepalette)
 394                         fb_set_logo_truepalette(info, fb_logo.logo, palette);
 395                 else
 396                         fb_set_logo_directpalette(info, fb_logo.logo, palette);
 397
 398                 saved_pseudo_palette = info->pseudo_palette;
 399                 info->pseudo_palette = palette;
 400         }
 401
 402         if (fb_logo.depth <= 4) {
 403                 logo_new = kmalloc(fb_logo.logo->width * fb_logo.logo->height,
 404                                    GFP_KERNEL);
 405                 if (logo_new == NULL) {
 406                         kfree(palette);
 407                         if (saved_pseudo_palette)
 408                                 info->pseudo_palette = saved_pseudo_palette;
 409                         return 0;
 410                 }
 411                 image.data = logo_new;
 412                 fb_set_logo(info, fb_logo.logo, logo_new, fb_logo.depth);
 413         }
 414
 415         image.width = fb_logo.logo->width;
 416         image.height = fb_logo.logo->height;
 417         image.dy = 0;
 418
 419         for (x = 0; x < num_online_cpus() * (fb_logo.logo->width + 8) &&
 420              x <= info->var.xres-fb_logo.logo->width; x += (fb_logo.logo->width + 8)) {
 421                 image.dx = x;
 422                 info->fbops->fb_imageblit(info, &image);
 423         }
 424
 425         kfree(palette);
 426         if (saved_pseudo_palette != NULL)
 427                 info->pseudo_palette = saved_pseudo_palette;
 428         kfree(logo_new);
 429         return fb_logo.logo->height;
 430 }
 431 #else
 432 int fb_prepare_logo(struct fb_info *info) { return 0; }
 433 int fb_show_logo(struct fb_info *info) { return 0; }
 434 #endif /* CONFIG_LOGO */
 435
 436 static int fbmem_read_proc(char *buf, char **start, off_t offset,
 437                            int len, int *eof, void *private)
 438 {
 439         struct fb_info **fi;
 440         int clen;
 441
 442         clen = 0;
 443         for (fi = registered_fb; fi < &registered_fb[FB_MAX] && len < 4000; fi++)
 444                 if (*fi)
 445                         clen += sprintf(buf + clen, "%d %s\n",
 446                                         (*fi)->node,
 447                                         (*fi)->fix.id);
 448         *start = buf + offset;
 449         if (clen > offset)
 450                 clen -= offset;
 451         else
 452                 clen = 0;
 453         return clen < len ? clen : len;
 454 }
 455
 456 static ssize_t
 457 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 458 {
 459         unsigned long p = *ppos;
 460         struct inode *inode = file->f_dentry->d_inode;
 461         int fbidx = iminor(inode);
 462         struct fb_info *info = registered_fb[fbidx];
 463         u32 *buffer, *dst;
 464         u32 __iomem *src;
 465         int c, i, cnt = 0, err = 0;
 466         unsigned long total_size;
 467
 468         if (!info || ! info->screen_base)
 469                 return -ENODEV;
 470
 471         if (info->state != FBINFO_STATE_RUNNING)
 472                 return -EPERM;
 473
 474         if (info->fbops->fb_read)
 475                 return info->fbops->fb_read(file, buf, count, ppos);
 476
 477         total_size = info->screen_size;
 478         if (total_size == 0)
 479                 total_size = info->fix.smem_len;
 480
 481         if (p >= total_size)
 482             return 0;
 483         if (count >= total_size)
 484             count = total_size;
 485         if (count + p > total_size)
 486                 count = total_size - p;
 487
 488         cnt = 0;
 489         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 490                          GFP_KERNEL);
 491         if (!buffer)
 492                 return -ENOMEM;
 493
 494         src = (u32 __iomem *) (info->screen_base + p);
 495
 496         if (info->fbops->fb_sync)
 497                 info->fbops->fb_sync(info);
 498
 499         while (count) {
 500                 c  = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 501                 dst = buffer;
 502                 for (i = c >> 2; i--; )
 503                         *dst++ = fb_readl(src++);
 504                 if (c & 3) {
 505                         u8 *dst8 = (u8 *) dst;
 506                         u8 __iomem *src8 = (u8 __iomem *) src;
 507
 508                         for (i = c & 3; i--;)
 509                                 *dst8++ = fb_readb(src8++);
 510
 511                         src = (u32 __iomem *) src8;
 512                 }
 513
 514                 if (copy_to_user(buf, buffer, c)) {
 515                         err = -EFAULT;
 516                         break;
 517                 }
 518                 *ppos += c;
 519                 buf += c;
 520                 cnt += c;
 521                 count -= c;
 522         }
 523
 524         kfree(buffer);
 525         return (err) ? err : cnt;
 526 }
 527
 528 static ssize_t
 529 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 530 {
 531         unsigned long p = *ppos;
 532         struct inode *inode = file->f_dentry->d_inode;
 533         int fbidx = iminor(inode);
 534         struct fb_info *info = registered_fb[fbidx];
 535         u32 *buffer, *src;
 536         u32 __iomem *dst;
 537         int c, i, cnt = 0, err;
 538         unsigned long total_size;
 539
 540         if (!info || !info->screen_base)
 541                 return -ENODEV;
 542
 543         if (info->state != FBINFO_STATE_RUNNING)
 544                 return -EPERM;
 545
 546         if (info->fbops->fb_write)
 547                 return info->fbops->fb_write(file, buf, count, ppos);
 548
 549         total_size = info->screen_size;
 550         if (total_size == 0)
 551                 total_size = info->fix.smem_len;
 552
 553         if (p > total_size)
 554             return -ENOSPC;
 555         if (count >= total_size)
 556             count = total_size;
 557         err = 0;
 558         if (count + p > total_size) {
 559             count = total_size - p;
 560             err = -ENOSPC;
 561         }
 562         cnt = 0;
 563         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 564                          GFP_KERNEL);
 565         if (!buffer)
 566                 return -ENOMEM;
 567
 568         dst = (u32 __iomem *) (info->screen_base + p);
 569
 570         if (info->fbops->fb_sync)
 571                 info->fbops->fb_sync(info);
 572
 573         while (count) {
 574                 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 575                 src = buffer;
 576                 if (copy_from_user(src, buf, c)) {
 577                         err = -EFAULT;
 578                         break;
 579                 }
 580                 for (i = c >> 2; i--; )
 581                         fb_writel(*src++, dst++);
 582                 if (c & 3) {
 583                         u8 *src8 = (u8 *) src;
 584                         u8 __iomem *dst8 = (u8 __iomem *) dst;
 585
 586                         for (i = c & 3; i--; )
 587                                 fb_writeb(*src8++, dst8++);
 588
 589                         dst = (u32 __iomem *) dst8;
 590                 }
 591                 *ppos += c;
 592                 buf += c;
 593                 cnt += c;
 594                 count -= c;
 595         }
 596         kfree(buffer);
 597
 598         return (err) ? err : cnt;
 599 }
 600
 601 #ifdef CONFIG_KMOD
 602 static void try_to_load(int fb)
 603 {
 604         request_module("fb%d", fb);
 605 }
 606 #endif /* CONFIG_KMOD */
 607
 608 int
 609 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
 610 {
 611         int xoffset = var->xoffset;
 612         int yoffset = var->yoffset;
 613         int err;
 614
 615         if (xoffset < 0 || yoffset < 0 || !info->fbops->fb_pan_display ||
 616             xoffset + info->var.xres > info->var.xres_virtual ||
 617             yoffset + info->var.yres > info->var.yres_virtual)
 618                 return -EINVAL;
 619         if ((err = info->fbops->fb_pan_display(var, info)))
 620                 return err;
 621         info->var.xoffset = var->xoffset;
 622         info->var.yoffset = var->yoffset;
 623         if (var->vmode & FB_VMODE_YWRAP)
 624                 info->var.vmode |= FB_VMODE_YWRAP;
 625         else
 626                 info->var.vmode &= ~FB_VMODE_YWRAP;
 627         return 0;
 628 }
 629
 630 int
 631 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
 632 {
 633         int err;
 634
 635         if (var->activate & FB_ACTIVATE_INV_MODE) {
 636                 struct fb_videomode mode1, mode2;
 637                 int ret = 0;
 638
 639                 fb_var_to_videomode(&mode1, var);
 640                 fb_var_to_videomode(&mode2, &info->var);
 641                 /* make sure we don't delete the videomode of current var */
 642                 ret = fb_mode_is_equal(&mode1, &mode2);
 643
 644                 if (!ret) {
 645                     struct fb_event event;
 646
 647                     event.info = info;
 648                     event.data = &mode1;
 649                     ret = notifier_call_chain(&fb_notifier_list,
 650                                               FB_EVENT_MODE_DELETE, &event);
 651                 }
 652
 653                 if (!ret)
 654                     fb_delete_videomode(&mode1, &info->modelist);
 655
 656                 return ret;
 657         }
 658
 659         if ((var->activate & FB_ACTIVATE_FORCE) ||
 660             memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
 661                 if (!info->fbops->fb_check_var) {
 662                         *var = info->var;
 663                         return 0;
 664                 }
 665
 666                 if ((err = info->fbops->fb_check_var(var, info)))
 667                         return err;
 668
 669                 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
 670                         struct fb_videomode mode;
 671                         int err = 0;
 672
 673                         info->var = *var;
 674                         if (info->fbops->fb_set_par)
 675                                 info->fbops->fb_set_par(info);
 676
 677                         fb_pan_display(info, &info->var);
 678
 679                         fb_set_cmap(&info->cmap, info);
 680
 681                         fb_var_to_videomode(&mode, &info->var);
 682
 683                         if (info->modelist.prev && info->modelist.next &&
 684                             !list_empty(&info->modelist))
 685                                 err = fb_add_videomode(&mode, &info->modelist);
 686
 687                         if (!err && info->flags & FBINFO_MISC_USEREVENT) {
 688                                 struct fb_event event;
 689
 690                                 info->flags &= ~FBINFO_MISC_USEREVENT;
 691                                 event.info = info;
 692                                 notifier_call_chain(&fb_notifier_list,
 693                                                     FB_EVENT_MODE_CHANGE,
 694                                                     &event);
 695                         }
 696                 }
 697         }
 698         return 0;
 699 }
 700
 701 int
 702 fb_blank(struct fb_info *info, int blank)
 703 {
 704         int ret = -EINVAL;
 705
 706         if (blank > FB_BLANK_POWERDOWN)
 707                 blank = FB_BLANK_POWERDOWN;
 708
 709         if (info->fbops->fb_blank)
 710                 ret = info->fbops->fb_blank(blank, info);
 711
 712         if (!ret) {
 713                 struct fb_event event;
 714
 715                 event.info = info;
 716                 event.data = &blank;
 717                 notifier_call_chain(&fb_notifier_list, FB_EVENT_BLANK, &event);
 718         }
 719
 720         return ret;
 721 }
 722
 723 static int
 724 fb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
 725          unsigned long arg)
 726 {
 727         int fbidx = iminor(inode);
 728         struct fb_info *info = registered_fb[fbidx];
 729         struct fb_ops *fb = info->fbops;
 730         struct fb_var_screeninfo var;
 731         struct fb_fix_screeninfo fix;
 732         struct fb_con2fbmap con2fb;
 733         struct fb_cmap_user cmap;
 734         struct fb_event event;
 735         void __user *argp = (void __user *)arg;
 736         int i;
 737
 738         if (!fb)
 739                 return -ENODEV;
 740         switch (cmd) {
 741         case FBIOGET_VSCREENINFO:
 742                 return copy_to_user(argp, &info->var,
 743                                     sizeof(var)) ? -EFAULT : 0;
 744         case FBIOPUT_VSCREENINFO:
 745                 if (copy_from_user(&var, argp, sizeof(var)))
 746                         return -EFAULT;
 747                 acquire_console_sem();
 748                 info->flags |= FBINFO_MISC_USEREVENT;
 749                 i = fb_set_var(info, &var);
 750                 info->flags &= ~FBINFO_MISC_USEREVENT;
 751                 release_console_sem();
 752                 if (i) return i;
 753                 if (copy_to_user(argp, &var, sizeof(var)))
 754                         return -EFAULT;
 755                 return 0;
 756         case FBIOGET_FSCREENINFO:
 757                 return copy_to_user(argp, &info->fix,
 758                                     sizeof(fix)) ? -EFAULT : 0;
 759         case FBIOPUTCMAP:
 760                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
 761                         return -EFAULT;
 762                 return (fb_set_user_cmap(&cmap, info));
 763         case FBIOGETCMAP:
 764                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
 765                         return -EFAULT;
 766                 return fb_cmap_to_user(&info->cmap, &cmap);
 767         case FBIOPAN_DISPLAY:
 768                 if (copy_from_user(&var, argp, sizeof(var)))
 769                         return -EFAULT;
 770                 acquire_console_sem();
 771                 i = fb_pan_display(info, &var);
 772                 release_console_sem();
 773                 if (i)
 774                         return i;
 775                 if (copy_to_user(argp, &var, sizeof(var)))
 776                         return -EFAULT;
 777                 return 0;
 778         case FBIO_CURSOR:
 779                 return -EINVAL;
 780         case FBIOGET_CON2FBMAP:
 781                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
 782                         return -EFAULT;
 783                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
 784                     return -EINVAL;
 785                 con2fb.framebuffer = -1;
 786                 event.info = info;
 787                 event.data = &con2fb;
 788                 notifier_call_chain(&fb_notifier_list,
 789                                     FB_EVENT_GET_CONSOLE_MAP, &event);
 790                 return copy_to_user(argp, &con2fb,
 791                                     sizeof(con2fb)) ? -EFAULT : 0;
 792         case FBIOPUT_CON2FBMAP:
 793                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
 794                         return - EFAULT;
 795                 if (con2fb.console < 0 || con2fb.console > MAX_NR_CONSOLES)
 796                     return -EINVAL;
 797                 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
 798                     return -EINVAL;
 799 #ifdef CONFIG_KMOD
 800                 if (!registered_fb[con2fb.framebuffer])
 801                     try_to_load(con2fb.framebuffer);
 802 #endif /* CONFIG_KMOD */
 803                 if (!registered_fb[con2fb.framebuffer])
 804                     return -EINVAL;
 805                 event.info = info;
 806                 event.data = &con2fb;
 807                 return notifier_call_chain(&fb_notifier_list,
 808                                            FB_EVENT_SET_CONSOLE_MAP,
 809                                            &event);
 810         case FBIOBLANK:
 811                 acquire_console_sem();
 812                 info->flags |= FBINFO_MISC_USEREVENT;
 813                 i = fb_blank(info, arg);
 814                 info->flags &= ~FBINFO_MISC_USEREVENT;
 815                 release_console_sem();
 816                 return i;
 817         default:
 818                 if (fb->fb_ioctl == NULL)
 819                         return -EINVAL;
 820                 return fb->fb_ioctl(inode, file, cmd, arg, info);
 821         }
 822 }
 823
 824 #ifdef CONFIG_COMPAT
 825 static long
 826 fb_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 827 {
 828         int fbidx = iminor(file->f_dentry->d_inode);
 829         struct fb_info *info = registered_fb[fbidx];
 830         struct fb_ops *fb = info->fbops;
 831         long ret;
 832
 833         if (fb->fb_compat_ioctl == NULL)
 834                 return -ENOIOCTLCMD;
 835         lock_kernel();
 836         ret = fb->fb_compat_ioctl(file, cmd, arg, info);
 837         unlock_kernel();
 838         return ret;
 839 }
 840 #endif
 841
 842 static int
 843 fb_mmap(struct file *file, struct vm_area_struct * vma)
 844 {
 845         int fbidx = iminor(file->f_dentry->d_inode);
 846         struct fb_info *info = registered_fb[fbidx];
 847         struct fb_ops *fb = info->fbops;
 848         unsigned long off;
 849 #if !defined(__sparc__) || defined(__sparc_v9__)
 850         unsigned long start;
 851         u32 len;
 852 #endif
 853
 854         if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
 855                 return -EINVAL;
 856         off = vma->vm_pgoff << PAGE_SHIFT;
 857         if (!fb)
 858                 return -ENODEV;
 859         if (fb->fb_mmap) {
 860                 int res;
 861                 lock_kernel();
 862                 res = fb->fb_mmap(info, file, vma);
 863                 unlock_kernel();
 864                 return res;
 865         }
 866
 867 #if defined(__sparc__) && !defined(__sparc_v9__)
 868         /* Should never get here, all fb drivers should have their own
 869            mmap routines */
 870         return -EINVAL;
 871 #else
 872         /* !sparc32... */
 873         lock_kernel();
 874
 875         /* frame buffer memory */
 876         start = info->fix.smem_start;
 877         len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
 878         if (off >= len) {
 879                 /* memory mapped io */
 880                 off -= len;
 881                 if (info->var.accel_flags) {
 882                         unlock_kernel();
 883                         return -EINVAL;
 884                 }
 885                 start = info->fix.mmio_start;
 886                 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
 887         }
 888         unlock_kernel();
 889         start &= PAGE_MASK;
 890         if ((vma->vm_end - vma->vm_start + off) > len)
 891                 return -EINVAL;
 892         off += start;
 893         vma->vm_pgoff = off >> PAGE_SHIFT;
 894         /* This is an IO map - tell maydump to skip this VMA */
 895         vma->vm_flags |= VM_IO | VM_RESERVED;
 896 #if defined(__sparc_v9__)
 897         if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
 898                                 vma->vm_end - vma->vm_start, vma->vm_page_prot))
 899                 return -EAGAIN;
 900 #else
 901 #if defined(__mc68000__)
 902 #if defined(CONFIG_SUN3)
 903         pgprot_val(vma->vm_page_prot) |= SUN3_PAGE_NOCACHE;
 904 #elif defined(CONFIG_MMU)
 905         if (CPU_IS_020_OR_030)
 906                 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE030;
 907         if (CPU_IS_040_OR_060) {
 908                 pgprot_val(vma->vm_page_prot) &= _CACHEMASK040;
 909                 /* Use no-cache mode, serialized */
 910                 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE_S;
 911         }
 912 #endif
 913 #elif defined(__powerpc__)
 914         vma->vm_page_prot = phys_mem_access_prot(file, off,
 915                                                  vma->vm_end - vma->vm_start,
 916                                                  vma->vm_page_prot);
 917 #elif defined(__alpha__)
 918         /* Caching is off in the I/O space quadrant by design.  */
 919 #elif defined(__i386__) || defined(__x86_64__)
 920         if (boot_cpu_data.x86 > 3)
 921                 pgprot_val(vma->vm_page_prot) |= _PAGE_PCD;
 922 #elif defined(__mips__)
 923         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 924 #elif defined(__hppa__)
 925         pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
 926 #elif defined(__arm__) || defined(__sh__) || defined(__m32r__)
 927         vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
 928 #elif defined(__ia64__)
 929         if (efi_range_is_wc(vma->vm_start, vma->vm_end - vma->vm_start))
 930                 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
 931         else
 932                 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 933 #else
 934 #warning What do we have to do here??
 935 #endif
 936         if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
 937                              vma->vm_end - vma->vm_start, vma->vm_page_prot))
 938                 return -EAGAIN;
 939 #endif /* !__sparc_v9__ */
 940         return 0;
 941 #endif /* !sparc32 */
 942 }
 943
 944 static int
 945 fb_open(struct inode *inode, struct file *file)
 946 {
 947         int fbidx = iminor(inode);
 948         struct fb_info *info;
 949         int res = 0;
 950
 951         if (fbidx >= FB_MAX)
 952                 return -ENODEV;
 953 #ifdef CONFIG_KMOD
 954         if (!(info = registered_fb[fbidx]))
 955                 try_to_load(fbidx);
 956 #endif /* CONFIG_KMOD */
 957         if (!(info = registered_fb[fbidx]))
 958                 return -ENODEV;
 959         if (!try_module_get(info->fbops->owner))
 960                 return -ENODEV;
 961         if (info->fbops->fb_open) {
 962                 res = info->fbops->fb_open(info,1);
 963                 if (res)
 964                         module_put(info->fbops->owner);
 965         }
 966         return res;
 967 }
 968
 969 static int
 970 fb_release(struct inode *inode, struct file *file)
 971 {
 972         int fbidx = iminor(inode);
 973         struct fb_info *info;
 974
 975         lock_kernel();
 976         info = registered_fb[fbidx];
 977         if (info->fbops->fb_release)
 978                 info->fbops->fb_release(info,1);
 979         module_put(info->fbops->owner);
 980         unlock_kernel();
 981         return 0;
 982 }
 983
 984 static struct file_operations fb_fops = {
 985         .owner =        THIS_MODULE,
 986         .read =         fb_read,
 987         .write =        fb_write,
 988         .ioctl =        fb_ioctl,
 989 #ifdef CONFIG_COMPAT
 990         .compat_ioctl = fb_compat_ioctl,
 991 #endif
 992         .mmap =         fb_mmap,
 993         .open =         fb_open,
 994         .release =      fb_release,
 995 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
 996         .get_unmapped_area = get_fb_unmapped_area,
 997 #endif
 998 };
 999
1000 static struct class *fb_class;
1001
1002 /**
1003  *      register_framebuffer - registers a frame buffer device
1004  *      @fb_info: frame buffer info structure
1005  *
1006  *      Registers a frame buffer device @fb_info.
1007  *
1008  *      Returns negative errno on error, or zero for success.
1009  *
1010  */
1011
1012 int
1013 register_framebuffer(struct fb_info *fb_info)
1014 {
1015         int i;
1016         struct fb_event event;
1017
1018         if (num_registered_fb == FB_MAX)
1019                 return -ENXIO;
1020         num_registered_fb++;
1021         for (i = 0 ; i < FB_MAX; i++)
1022                 if (!registered_fb[i])
1023                         break;
1024         fb_info->node = i;
1025
1026         fb_info->class_device = class_device_create(fb_class, MKDEV(FB_MAJOR, i),
1027                                     fb_info->device, "fb%d", i);
1028         if (IS_ERR(fb_info->class_device)) {
1029                 /* Not fatal */
1030                 printk(KERN_WARNING "Unable to create class_device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->class_device));
1031                 fb_info->class_device = NULL;
1032         } else
1033                 fb_init_class_device(fb_info);
1034
1035         if (fb_info->pixmap.addr == NULL) {
1036                 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1037                 if (fb_info->pixmap.addr) {
1038                         fb_info->pixmap.size = FBPIXMAPSIZE;
1039                         fb_info->pixmap.buf_align = 1;
1040                         fb_info->pixmap.scan_align = 1;
1041                         fb_info->pixmap.access_align = 4;
1042                         fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1043                 }
1044         }
1045         fb_info->pixmap.offset = 0;
1046
1047         if (!fb_info->modelist.prev ||
1048             !fb_info->modelist.next ||
1049             list_empty(&fb_info->modelist)) {
1050                 struct fb_videomode mode;
1051
1052                 INIT_LIST_HEAD(&fb_info->modelist);
1053                 fb_var_to_videomode(&mode, &fb_info->var);
1054                 fb_add_videomode(&mode, &fb_info->modelist);
1055         }
1056
1057         registered_fb[i] = fb_info;
1058
1059         devfs_mk_cdev(MKDEV(FB_MAJOR, i),
1060                         S_IFCHR | S_IRUGO | S_IWUGO, "fb/%d", i);
1061         event.info = fb_info;
1062         notifier_call_chain(&fb_notifier_list,
1063                             FB_EVENT_FB_REGISTERED, &event);
1064         return 0;
1065 }
1066
1067
1068 /**
1069  *      unregister_framebuffer - releases a frame buffer device
1070  *      @fb_info: frame buffer info structure
1071  *
1072  *      Unregisters a frame buffer device @fb_info.
1073  *
1074  *      Returns negative errno on error, or zero for success.
1075  *
1076  */
1077
1078 int
1079 unregister_framebuffer(struct fb_info *fb_info)
1080 {
1081         int i;
1082
1083         i = fb_info->node;
1084         if (!registered_fb[i])
1085                 return -EINVAL;
1086         devfs_remove("fb/%d", i);
1087
1088         if (fb_info->pixmap.addr && (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1089                 kfree(fb_info->pixmap.addr);
1090         fb_destroy_modelist(&fb_info->modelist);
1091         registered_fb[i]=NULL;
1092         num_registered_fb--;
1093         fb_cleanup_class_device(fb_info);
1094         class_device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1095         return 0;
1096 }
1097
1098 /**
1099  *      fb_register_client - register a client notifier
1100  *      @nb: notifier block to callback on events
1101  */
1102 int fb_register_client(struct notifier_block *nb)
1103 {
1104         return notifier_chain_register(&fb_notifier_list, nb);
1105 }
1106
1107 /**
1108  *      fb_unregister_client - unregister a client notifier
1109  *      @nb: notifier block to callback on events
1110  */
1111 int fb_unregister_client(struct notifier_block *nb)
1112 {
1113         return notifier_chain_unregister(&fb_notifier_list, nb);
1114 }
1115
1116 /**
1117  *      fb_set_suspend - low level driver signals suspend
1118  *      @info: framebuffer affected
1119  *      @state: 0 = resuming, !=0 = suspending
1120  *
1121  *      This is meant to be used by low level drivers to
1122  *      signal suspend/resume to the core & clients.
1123  *      It must be called with the console semaphore held
1124  */
1125 void fb_set_suspend(struct fb_info *info, int state)
1126 {
1127         struct fb_event event;
1128
1129         event.info = info;
1130         if (state) {
1131                 notifier_call_chain(&fb_notifier_list, FB_EVENT_SUSPEND, &event);
1132                 info->state = FBINFO_STATE_SUSPENDED;
1133         } else {
1134                 info->state = FBINFO_STATE_RUNNING;
1135                 notifier_call_chain(&fb_notifier_list, FB_EVENT_RESUME, &event);
1136         }
1137 }
1138
1139 /**
1140  *      fbmem_init - init frame buffer subsystem
1141  *
1142  *      Initialize the frame buffer subsystem.
1143  *
1144  *      NOTE: This function is _only_ to be called by drivers/char/mem.c.
1145  *
1146  */
1147
1148 static int __init
1149 fbmem_init(void)
1150 {
1151         create_proc_read_entry("fb", 0, NULL, fbmem_read_proc, NULL);
1152
1153         devfs_mk_dir("fb");
1154         if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1155                 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1156
1157         fb_class = class_create(THIS_MODULE, "graphics");
1158         if (IS_ERR(fb_class)) {
1159                 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1160                 fb_class = NULL;
1161         }
1162         return 0;
1163 }
1164
1165 #ifdef MODULE
1166 module_init(fbmem_init);
1167 static void __exit
1168 fbmem_exit(void)
1169 {
1170         class_destroy(fb_class);
1171 }
1172
1173 module_exit(fbmem_exit);
1174 MODULE_LICENSE("GPL");
1175 MODULE_DESCRIPTION("Framebuffer base");
1176 #else
1177 subsys_initcall(fbmem_init);
1178 #endif
1179
1180 int fb_new_modelist(struct fb_info *info)
1181 {
1182         struct fb_event event;
1183         struct fb_var_screeninfo var = info->var;
1184         struct list_head *pos, *n;
1185         struct fb_modelist *modelist;
1186         struct fb_videomode *m, mode;
1187         int err = 1;
1188
1189         list_for_each_safe(pos, n, &info->modelist) {
1190                 modelist = list_entry(pos, struct fb_modelist, list);
1191                 m = &modelist->mode;
1192                 fb_videomode_to_var(&var, m);
1193                 var.activate = FB_ACTIVATE_TEST;
1194                 err = fb_set_var(info, &var);
1195                 fb_var_to_videomode(&mode, &var);
1196                 if (err || !fb_mode_is_equal(m, &mode)) {
1197                         list_del(pos);
1198                         kfree(pos);
1199                 }
1200         }
1201
1202         err = 1;
1203
1204         if (!list_empty(&info->modelist)) {
1205                 event.info = info;
1206                 err = notifier_call_chain(&fb_notifier_list,
1207                                            FB_EVENT_NEW_MODELIST,
1208                                            &event);
1209         }
1210
1211         return err;
1212 }
1213
1214 static char *video_options[FB_MAX];
1215 static int ofonly;
1216
1217 extern const char *global_mode_option;
1218
1219 /**
1220  * fb_get_options - get kernel boot parameters
1221  * @name:   framebuffer name as it would appear in
1222  *          the boot parameter line
1223  *          (video=<name>:<options>)
1224  * @option: the option will be stored here
1225  *
1226  * NOTE: Needed to maintain backwards compatibility
1227  */
1228 int fb_get_options(char *name, char **option)
1229 {
1230         char *opt, *options = NULL;
1231         int opt_len, retval = 0;
1232         int name_len = strlen(name), i;
1233
1234         if (name_len && ofonly && strncmp(name, "offb", 4))
1235                 retval = 1;
1236
1237         if (name_len && !retval) {
1238                 for (i = 0; i < FB_MAX; i++) {
1239                         if (video_options[i] == NULL)
1240                                 continue;
1241                         opt_len = strlen(video_options[i]);
1242                         if (!opt_len)
1243                                 continue;
1244                         opt = video_options[i];
1245                         if (!strncmp(name, opt, name_len) &&
1246                             opt[name_len] == ':')
1247                                 options = opt + name_len + 1;
1248                 }
1249         }
1250         if (options && !strncmp(options, "off", 3))
1251                 retval = 1;
1252
1253         if (option)
1254                 *option = options;
1255
1256         return retval;
1257 }
1258
1259 /**
1260  *      video_setup - process command line options
1261  *      @options: string of options
1262  *
1263  *      Process command line options for frame buffer subsystem.
1264  *
1265  *      NOTE: This function is a __setup and __init function.
1266  *            It only stores the options.  Drivers have to call
1267  *            fb_get_options() as necessary.
1268  *
1269  *      Returns zero.
1270  *
1271  */
1272 static int __init video_setup(char *options)
1273 {
1274         int i, global = 0;
1275
1276         if (!options || !*options)
1277                 global = 1;
1278
1279         if (!global && !strncmp(options, "ofonly", 6)) {
1280                 ofonly = 1;
1281                 global = 1;
1282         }
1283
1284         if (!global && !strstr(options, "fb:")) {
1285                 global_mode_option = options;
1286                 global = 1;
1287         }
1288
1289         if (!global) {
1290                 for (i = 0; i < FB_MAX; i++) {
1291                         if (video_options[i] == NULL) {
1292                                 video_options[i] = options;
1293                                 break;
1294                         }
1295
1296                 }
1297         }
1298
1299         return 0;
1300 }
1301 __setup("video=", video_setup);
1302
1303     /*
1304      *  Visible symbols for modules
1305      */
1306
1307 EXPORT_SYMBOL(register_framebuffer);
1308 EXPORT_SYMBOL(unregister_framebuffer);
1309 EXPORT_SYMBOL(num_registered_fb);
1310 EXPORT_SYMBOL(registered_fb);
1311 EXPORT_SYMBOL(fb_prepare_logo);
1312 EXPORT_SYMBOL(fb_show_logo);
1313 EXPORT_SYMBOL(fb_set_var);
1314 EXPORT_SYMBOL(fb_blank);
1315 EXPORT_SYMBOL(fb_pan_display);
1316 EXPORT_SYMBOL(fb_get_buffer_offset);
1317 EXPORT_SYMBOL(fb_set_suspend);
1318 EXPORT_SYMBOL(fb_register_client);
1319 EXPORT_SYMBOL(fb_unregister_client);
1320 EXPORT_SYMBOL(fb_get_options);
1321 EXPORT_SYMBOL(fb_new_modelist);
1322
1323 MODULE_LICENSE("GPL");