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
  39 #if defined(__mc68000__) || defined(CONFIG_APUS)
  40 #include <asm/setup.h>
  41 #endif
  42
  43 #include <asm/io.h>
  44 #include <asm/uaccess.h>
  45 #include <asm/page.h>
  46 #include <asm/pgtable.h>
  47
  48 #include <linux/fb.h>
  49
  50 #ifdef CONFIG_FRAMEBUFFER_CONSOLE
  51 #include "console/fbcon.h"
  52 #endif
  53     /*
  54      *  Frame buffer device initialization and setup routines
  55      */
  56
  57 extern int acornfb_init(void);
  58 extern int acornfb_setup(char*);
  59 extern int amifb_init(void);
  60 extern int amifb_setup(char*);
  61 extern int atafb_init(void);
  62 extern int atafb_setup(char*);
  63 extern int macfb_init(void);
  64 extern int macfb_setup(char*);
  65 extern int cyberfb_init(void);
  66 extern int cyberfb_setup(char*);
  67 extern int pm2fb_init(void);
  68 extern int pm2fb_setup(char*);
  69 extern int pm3fb_init(void);
  70 extern int pm3fb_setup(char*);
  71 extern int clps711xfb_init(void);
  72 extern int cyber2000fb_init(void);
  73 extern int cyber2000fb_setup(char*);
  74 extern int retz3fb_init(void);
  75 extern int retz3fb_setup(char*);
  76 extern int clgenfb_init(void);
  77 extern int clgenfb_setup(char*);
  78 extern int hitfb_init(void);
  79 extern int vfb_init(void);
  80 extern int vfb_setup(char*);
  81 extern int offb_init(void);
  82 extern int atyfb_init(void);
  83 extern int atyfb_setup(char*);
  84 extern int aty128fb_init(void);
  85 extern int aty128fb_setup(char*);
  86 extern int neofb_init(void);
  87 extern int neofb_setup(char*);
  88 extern int igafb_init(void);
  89 extern int igafb_setup(char*);
  90 extern int imsttfb_init(void);
  91 extern int imsttfb_setup(char*);
  92 extern int dnfb_init(void);
  93 extern int tgafb_init(void);
  94 extern int tgafb_setup(char*);
  95 extern int virgefb_init(void);
  96 extern int virgefb_setup(char*);
  97 extern int resolver_video_setup(char*);
  98 extern int s3triofb_init(void);
  99 extern int vesafb_init(void);
 100 extern int vesafb_setup(char*);
 101 extern int vga16fb_init(void);
 102 extern int vga16fb_setup(char*);
 103 extern int hgafb_init(void);
 104 extern int hgafb_setup(char*);
 105 extern int matroxfb_init(void);
 106 extern int matroxfb_setup(char*);
 107 extern int hpfb_init(void);
 108 extern int platinumfb_init(void);
 109 extern int platinumfb_setup(char*);
 110 extern int control_init(void);
 111 extern int control_setup(char*);
 112 extern int valkyriefb_init(void);
 113 extern int valkyriefb_setup(char*);
 114 extern int chips_init(void);
 115 extern int g364fb_init(void);
 116 extern int sa1100fb_init(void);
 117 extern int pxafb_init(void);
 118 extern int pxafb_setup(char*);
 119 extern int fm2fb_init(void);
 120 extern int fm2fb_setup(char*);
 121 extern int q40fb_init(void);
 122 extern int sun3fb_init(void);
 123 extern int sun3fb_setup(char *);
 124 extern int sgivwfb_init(void);
 125 extern int sgivwfb_setup(char*);
 126 extern int gbefb_init(void);
 127 extern int gbefb_setup(char*);
 128 extern int rivafb_init(void);
 129 extern int rivafb_setup(char*);
 130 extern int tdfxfb_init(void);
 131 extern int tdfxfb_setup(char*);
 132 extern int tridentfb_init(void);
 133 extern int tridentfb_setup(char*);
 134 extern int sisfb_init(void);
 135 extern int sisfb_setup(char*);
 136 extern int stifb_init(void);
 137 extern int stifb_setup(char*);
 138 extern int pmagbafb_init(void);
 139 extern int pmagbbfb_init(void);
 140 extern int maxinefb_init(void);
 141 extern int tx3912fb_init(void);
 142 extern int tx3912fb_setup(char*);
 143 extern int radeonfb_init(void);
 144 extern int radeonfb_setup(char*);
 145 extern int radeonfb_old_init(void);
 146 extern int radeonfb_old_setup(char*);
 147 extern int e1355fb_init(void);
 148 extern int e1355fb_setup(char*);
 149 extern int pvr2fb_init(void);
 150 extern int pvr2fb_setup(char*);
 151 extern int sstfb_init(void);
 152 extern int sstfb_setup(char*);
 153 extern int i810fb_init(void);
 154 extern int i810fb_setup(char*);
 155 extern int ffb_init(void);
 156 extern int ffb_setup(char*);
 157 extern int cg6_init(void);
 158 extern int cg6_setup(char*);
 159 extern int cg3_init(void);
 160 extern int cg3_setup(char*);
 161 extern int bw2_init(void);
 162 extern int bw2_setup(char*);
 163 extern int cg14_init(void);
 164 extern int cg14_setup(char*);
 165 extern int p9100_init(void);
 166 extern int p9100_setup(char*);
 167 extern int tcx_init(void);
 168 extern int tcx_setup(char*);
 169 extern int leo_init(void);
 170 extern int leo_setup(char*);
 171 extern int kyrofb_init(void);
 172 extern int kyrofb_setup(char*);
 173 extern int mc68x328fb_init(void);
 174 extern int mc68x328fb_setup(char *);
 175 extern int asiliantfb_init(void);
 176
 177 static struct {
 178         const char *name;
 179         int (*init)(void);
 180         int (*setup)(char*);
 181 } fb_drivers[] __initdata = {
 182
 183         /*
 184          * Chipset specific drivers that use resource management
 185          */
 186 #ifdef CONFIG_FB_RETINAZ3
 187         { "retz3fb", retz3fb_init, retz3fb_setup },
 188 #endif
 189 #ifdef CONFIG_FB_AMIGA
 190         { "amifb", amifb_init, amifb_setup },
 191 #endif
 192 #ifdef CONFIG_FB_CLPS711X
 193         { "clps711xfb", clps711xfb_init, NULL },
 194 #endif
 195 #ifdef CONFIG_FB_CYBER
 196         { "cyberfb", cyberfb_init, cyberfb_setup },
 197 #endif
 198 #ifdef CONFIG_FB_CYBER2000
 199         { "cyber2000fb", cyber2000fb_init, cyber2000fb_setup },
 200 #endif
 201 #ifdef CONFIG_FB_PM2
 202         { "pm2fb", pm2fb_init, pm2fb_setup },
 203 #endif
 204 #ifdef CONFIG_FB_PM3
 205         { "pm3fb", pm3fb_init, pm3fb_setup },
 206 #endif
 207 #ifdef CONFIG_FB_CLGEN
 208         { "clgenfb", clgenfb_init, clgenfb_setup },
 209 #endif
 210 #ifdef CONFIG_FB_ATY
 211         { "atyfb", atyfb_init, atyfb_setup },
 212 #endif
 213 #ifdef CONFIG_FB_MATROX
 214         { "matroxfb", matroxfb_init, matroxfb_setup },
 215 #endif
 216 #ifdef CONFIG_FB_ATY128
 217         { "aty128fb", aty128fb_init, aty128fb_setup },
 218 #endif
 219 #ifdef CONFIG_FB_NEOMAGIC
 220         { "neofb", neofb_init, neofb_setup },
 221 #endif
 222 #ifdef CONFIG_FB_VIRGE
 223         { "virgefb", virgefb_init, virgefb_setup },
 224 #endif
 225 #ifdef CONFIG_FB_RIVA
 226         { "rivafb", rivafb_init, rivafb_setup },
 227 #endif
 228 #ifdef CONFIG_FB_3DFX
 229         { "tdfxfb", tdfxfb_init, tdfxfb_setup },
 230 #endif
 231 #ifdef CONFIG_FB_RADEON
 232         { "radeonfb", radeonfb_init, radeonfb_setup },
 233 #endif
 234 #ifdef CONFIG_FB_RADEON_OLD
 235         { "radeonfb_old", radeonfb_old_init, radeonfb_old_setup },
 236 #endif
 237 #ifdef CONFIG_FB_CONTROL
 238         { "controlfb", control_init, control_setup },
 239 #endif
 240 #ifdef CONFIG_FB_PLATINUM
 241         { "platinumfb", platinumfb_init, platinumfb_setup },
 242 #endif
 243 #ifdef CONFIG_FB_VALKYRIE
 244         { "valkyriefb", valkyriefb_init, valkyriefb_setup },
 245 #endif
 246 #ifdef CONFIG_FB_CT65550
 247         { "chipsfb", chips_init, NULL },
 248 #endif
 249 #ifdef CONFIG_FB_IMSTT
 250         { "imsttfb", imsttfb_init, imsttfb_setup },
 251 #endif
 252 #ifdef CONFIG_FB_S3TRIO
 253         { "s3triofb", s3triofb_init, NULL },
 254 #endif
 255 #ifdef CONFIG_FB_FM2
 256         { "fm2fb", fm2fb_init, fm2fb_setup },
 257 #endif
 258 #ifdef CONFIG_FB_SIS
 259         { "sisfb", sisfb_init, sisfb_setup },
 260 #endif
 261 #ifdef CONFIG_FB_TRIDENT
 262         { "tridentfb", tridentfb_init, tridentfb_setup },
 263 #endif
 264 #ifdef CONFIG_FB_I810
 265         { "i810fb", i810fb_init, i810fb_setup },
 266 #endif
 267 #ifdef CONFIG_FB_STI
 268         { "stifb", stifb_init, stifb_setup },
 269 #endif
 270 #ifdef CONFIG_FB_FFB
 271         { "ffb", ffb_init, ffb_setup },
 272 #endif
 273 #ifdef CONFIG_FB_CG6
 274         { "cg6fb", cg6_init, cg6_setup },
 275 #endif
 276 #ifdef CONFIG_FB_CG3
 277         { "cg3fb", cg3_init, cg3_setup },
 278 #endif
 279 #ifdef CONFIG_FB_BW2
 280         { "bw2fb", bw2_init, bw2_setup },
 281 #endif
 282 #ifdef CONFIG_FB_CG14
 283         { "cg14fb", cg14_init, cg14_setup },
 284 #endif
 285 #ifdef CONFIG_FB_P9100
 286         { "p9100fb", p9100_init, p9100_setup },
 287 #endif
 288 #ifdef CONFIG_FB_TCX
 289         { "tcxfb", tcx_init, tcx_setup },
 290 #endif
 291 #ifdef CONFIG_FB_LEO
 292         { "leofb", leo_init, leo_setup },
 293 #endif
 294
 295         /*
 296          * Generic drivers that are used as fallbacks
 297          *
 298          * These depend on resource management and must be initialized
 299          * _after_ all other frame buffer devices that use resource
 300          * management!
 301          */
 302
 303 #ifdef CONFIG_FB_OF
 304         { "offb", offb_init, NULL },
 305 #endif
 306 #ifdef CONFIG_FB_VESA
 307         { "vesafb", vesafb_init, vesafb_setup },
 308 #endif
 309
 310         /*
 311          * Chipset specific drivers that don't use resource management (yet)
 312          */
 313
 314 #ifdef CONFIG_FB_SGIVW
 315         { "sgivwfb", sgivwfb_init, sgivwfb_setup },
 316 #endif
 317 #ifdef CONFIG_FB_GBE
 318         { "gbefb", gbefb_init, gbefb_setup },
 319 #endif
 320 #ifdef CONFIG_FB_ACORN
 321         { "acornfb", acornfb_init, acornfb_setup },
 322 #endif
 323 #ifdef CONFIG_FB_ATARI
 324         { "atafb", atafb_init, atafb_setup },
 325 #endif
 326 #ifdef CONFIG_FB_MAC
 327         { "macfb", macfb_init, macfb_setup },
 328 #endif
 329 #ifdef CONFIG_FB_HGA
 330         { "hgafb", hgafb_init, hgafb_setup },
 331 #endif
 332 #ifdef CONFIG_FB_IGA
 333         { "igafb", igafb_init, igafb_setup },
 334 #endif
 335 #ifdef CONFIG_APOLLO
 336         { "apollofb", dnfb_init, NULL },
 337 #endif
 338 #ifdef CONFIG_FB_Q40
 339         { "q40fb", q40fb_init, NULL },
 340 #endif
 341 #ifdef CONFIG_FB_TGA
 342         { "tgafb", tgafb_init, tgafb_setup },
 343 #endif
 344 #ifdef CONFIG_FB_HP300
 345         { "hpfb", hpfb_init, NULL },
 346 #endif
 347 #ifdef CONFIG_FB_G364
 348         { "g364fb", g364fb_init, NULL },
 349 #endif
 350 #ifdef CONFIG_FB_SA1100
 351         { "sa1100fb", sa1100fb_init, NULL },
 352 #endif
 353 #ifdef CONFIG_FB_PXA
 354         { "pxafb", pxafb_init, pxafb_setup },
 355 #endif
 356 #ifdef CONFIG_FB_SUN3
 357         { "sun3fb", sun3fb_init, sun3fb_setup },
 358 #endif
 359 #ifdef CONFIG_FB_HIT
 360         { "hitfb", hitfb_init, NULL },
 361 #endif
 362 #ifdef CONFIG_FB_TX3912
 363         { "tx3912fb", tx3912fb_init, tx3912fb_setup },
 364 #endif
 365 #ifdef CONFIG_FB_E1355
 366         { "e1355fb", e1355fb_init, e1355fb_setup },
 367 #endif
 368 #ifdef CONFIG_FB_PVR2
 369         { "pvr2fb", pvr2fb_init, pvr2fb_setup },
 370 #endif
 371 #ifdef CONFIG_FB_PMAG_BA
 372         { "pmagbafb", pmagbafb_init, NULL },
 373 #endif
 374 #ifdef CONFIG_FB_PMAGB_B
 375         { "pmagbbfb", pmagbbfb_init, NULL },
 376 #endif
 377 #ifdef CONFIG_FB_MAXINE
 378         { "maxinefb", maxinefb_init, NULL },
 379 #endif
 380 #ifdef CONFIG_FB_VOODOO1
 381         { "sstfb", sstfb_init, sstfb_setup },
 382 #endif
 383 #ifdef CONFIG_FB_KYRO
 384         { "kyrofb", kyrofb_init, kyrofb_setup },
 385 #endif
 386 #ifdef CONFIG_FB_68328
 387         { "68328fb", mc68x328fb_init, mc68x328fb_setup },
 388 #endif
 389 #ifdef CONFIG_FB_ASILIANT
 390         { "asiliantfb", asiliantfb_init, NULL },
 391 #endif
 392
 393         /*
 394          * Generic drivers that don't use resource management (yet)
 395          */
 396
 397 #ifdef CONFIG_FB_VGA16
 398         { "vga16fb", vga16fb_init, vga16fb_setup },
 399 #endif
 400
 401 #ifdef CONFIG_GSP_RESOLVER
 402         /* Not a real frame buffer device... */
 403         { "resolverfb", NULL, resolver_video_setup },
 404 #endif
 405
 406 #ifdef CONFIG_FB_VIRTUAL
 407         /*
 408          * Vfb must be last to avoid that it becomes your primary display if
 409          * other display devices are present
 410          */
 411         { "vfb", vfb_init, vfb_setup },
 412 #endif
 413 };
 414
 415 #define NUM_FB_DRIVERS  (sizeof(fb_drivers)/sizeof(*fb_drivers))
 416 #define FBPIXMAPSIZE    16384
 417
 418 extern const char *global_mode_option;
 419
 420 static initcall_t pref_init_funcs[FB_MAX];
 421 static int num_pref_init_funcs __initdata = 0;
 422 static struct notifier_block *fb_notifier_list;
 423 struct fb_info *registered_fb[FB_MAX];
 424 int num_registered_fb;
 425
 426 #ifdef CONFIG_FB_OF
 427 static int ofonly __initdata = 0;
 428 #endif
 429
 430 /*
 431  * Drawing helpers.
 432  */
 433 static u8 fb_sys_inbuf(struct fb_info *info, u8 *src)
 434 {
 435         return *src;
 436 }
 437
 438 static void fb_sys_outbuf(struct fb_info *info, u8 *dst,
 439                                 u8 *src, unsigned int size)
 440 {
 441         memcpy(dst, src, size);
 442 }
 443
 444 void fb_move_buf_aligned(struct fb_info *info, struct fb_pixmap *buf,
 445                         u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch,
 446                         u32 height)
 447 {
 448         int i;
 449
 450         for (i = height; i--; ) {
 451                 buf->outbuf(info, dst, src, s_pitch);
 452                 src += s_pitch;
 453                 dst += d_pitch;
 454         }
 455 }
 456
 457 void fb_move_buf_unaligned(struct fb_info *info, struct fb_pixmap *buf,
 458                         u8 *dst, u32 d_pitch, u8 *src, u32 idx,
 459                         u32 height, u32 shift_high, u32 shift_low,
 460                         u32 mod)
 461 {
 462         u8 mask = (u8) (0xfff << shift_high), tmp;
 463         int i, j;
 464
 465         for (i = height; i--; ) {
 466                 for (j = 0; j < idx; j++) {
 467                         tmp = buf->inbuf(info, dst+j);
 468                         tmp &= mask;
 469                         tmp |= *src >> shift_low;
 470                         buf->outbuf(info, dst+j, &tmp, 1);
 471                         tmp = *src << shift_high;
 472                         buf->outbuf(info, dst+j+1, &tmp, 1);
 473                         src++;
 474                 }
 475                 tmp = buf->inbuf(info, dst+idx);
 476                 tmp &= mask;
 477                 tmp |= *src >> shift_low;
 478                 buf->outbuf(info, dst+idx, &tmp, 1);
 479                 if (shift_high < mod) {
 480                         tmp = *src << shift_high;
 481                         buf->outbuf(info, dst+idx+1, &tmp, 1);
 482                 }
 483                 src++;
 484                 dst += d_pitch;
 485         }
 486 }
 487
 488 /*
 489  * we need to lock this section since fb_cursor
 490  * may use fb_imageblit()
 491  */
 492 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
 493 {
 494         u32 align = buf->buf_align - 1, offset;
 495         char *addr = buf->addr;
 496
 497         /* If IO mapped, we need to sync before access, no sharing of
 498          * the pixmap is done
 499          */
 500         if (buf->flags & FB_PIXMAP_IO) {
 501                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 502                         info->fbops->fb_sync(info);
 503                 return addr;
 504         }
 505
 506         /* See if we fit in the remaining pixmap space */
 507         offset = buf->offset + align;
 508         offset &= ~align;
 509         if (offset + size > buf->size) {
 510                 /* We do not fit. In order to be able to re-use the buffer,
 511                  * we must ensure no asynchronous DMA'ing or whatever operation
 512                  * is in progress, we sync for that.
 513                  */
 514                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 515                         info->fbops->fb_sync(info);
 516                 offset = 0;
 517         }
 518         buf->offset = offset + size;
 519         addr += offset;
 520
 521         return addr;
 522 }
 523
 524 #ifdef CONFIG_LOGO
 525 #include <linux/linux_logo.h>
 526
 527 static inline unsigned safe_shift(unsigned d, int n)
 528 {
 529         return n < 0 ? d >> -n : d << n;
 530 }
 531
 532 static void __init fb_set_logocmap(struct fb_info *info,
 533                                    const struct linux_logo *logo)
 534 {
 535         struct fb_cmap palette_cmap;
 536         u16 palette_green[16];
 537         u16 palette_blue[16];
 538         u16 palette_red[16];
 539         int i, j, n;
 540         const unsigned char *clut = logo->clut;
 541
 542         palette_cmap.start = 0;
 543         palette_cmap.len = 16;
 544         palette_cmap.red = palette_red;
 545         palette_cmap.green = palette_green;
 546         palette_cmap.blue = palette_blue;
 547         palette_cmap.transp = NULL;
 548
 549         for (i = 0; i < logo->clutsize; i += n) {
 550                 n = logo->clutsize - i;
 551                 /* palette_cmap provides space for only 16 colors at once */
 552                 if (n > 16)
 553                         n = 16;
 554                 palette_cmap.start = 32 + i;
 555                 palette_cmap.len = n;
 556                 for (j = 0; j < n; ++j) {
 557                         palette_cmap.red[j] = clut[0] << 8 | clut[0];
 558                         palette_cmap.green[j] = clut[1] << 8 | clut[1];
 559                         palette_cmap.blue[j] = clut[2] << 8 | clut[2];
 560                         clut += 3;
 561                 }
 562                 fb_set_cmap(&palette_cmap, 1, info);
 563         }
 564 }
 565
 566 static void  __init fb_set_logo_truepalette(struct fb_info *info,
 567                                             const struct linux_logo *logo,
 568                                             u32 *palette)
 569 {
 570         unsigned char mask[9] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
 571         unsigned char redmask, greenmask, bluemask;
 572         int redshift, greenshift, blueshift;
 573         int i;
 574         const unsigned char *clut = logo->clut;
 575
 576         /*
 577          * We have to create a temporary palette since console palette is only
 578          * 16 colors long.
 579          */
 580         /* Bug: Doesn't obey msb_right ... (who needs that?) */
 581         redmask   = mask[info->var.red.length   < 8 ? info->var.red.length   : 8];
 582         greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
 583         bluemask  = mask[info->var.blue.length  < 8 ? info->var.blue.length  : 8];
 584         redshift   = info->var.red.offset   - (8 - info->var.red.length);
 585         greenshift = info->var.green.offset - (8 - info->var.green.length);
 586         blueshift  = info->var.blue.offset  - (8 - info->var.blue.length);
 587
 588         for ( i = 0; i < logo->clutsize; i++) {
 589                 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
 590                                  safe_shift((clut[1] & greenmask), greenshift) |
 591                                  safe_shift((clut[2] & bluemask), blueshift));
 592                 clut += 3;
 593         }
 594 }
 595
 596 static void __init fb_set_logo_directpalette(struct fb_info *info,
 597                                              const struct linux_logo *logo,
 598                                              u32 *palette)
 599 {
 600         int redshift, greenshift, blueshift;
 601         int i;
 602
 603         redshift = info->var.red.offset;
 604         greenshift = info->var.green.offset;
 605         blueshift = info->var.blue.offset;
 606
 607         for (i = 32; i < logo->clutsize; i++)
 608                 palette[i] = i << redshift | i << greenshift | i << blueshift;
 609 }
 610
 611 static void __init fb_set_logo(struct fb_info *info,
 612                                const struct linux_logo *logo, u8 *dst,
 613                                int depth)
 614 {
 615         int i, j, shift;
 616         const u8 *src = logo->data;
 617         u8 d, xor = 0;
 618
 619         switch (depth) {
 620         case 4:
 621                 for (i = 0; i < logo->height; i++)
 622                         for (j = 0; j < logo->width; src++) {
 623                                 *dst++ = *src >> 4;
 624                                 j++;
 625                                 if (j < logo->width) {
 626                                         *dst++ = *src & 0x0f;
 627                                         j++;
 628                                 }
 629                         }
 630                 break;
 631         case ~1:
 632                 xor = 0xff;
 633         case 1:
 634                 for (i = 0; i < logo->height; i++) {
 635                         shift = 7;
 636                         d = *src++ ^ xor;
 637                         for (j = 0; j < logo->width; j++) {
 638                                 *dst++ = (d >> shift) & 1;
 639                                 shift = (shift-1) & 7;
 640                                 if (shift == 7)
 641                                         d = *src++ ^ xor;
 642                         }
 643                 }
 644                 break;
 645         }
 646 }
 647
 648 /*
 649  * Three (3) kinds of logo maps exist.  linux_logo_clut224 (>16 colors),
 650  * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors).  Depending on
 651  * the visual format and color depth of the framebuffer, the DAC, the
 652  * pseudo_palette, and the logo data will be adjusted accordingly.
 653  *
 654  * Case 1 - linux_logo_clut224:
 655  * Color exceeds the number of console colors (16), thus we set the hardware DAC
 656  * using fb_set_cmap() appropriately.  The "needs_cmapreset"  flag will be set.
 657  *
 658  * For visuals that require color info from the pseudo_palette, we also construct
 659  * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
 660  * will be set.
 661  *
 662  * Case 2 - linux_logo_vga16:
 663  * The number of colors just matches the console colors, thus there is no need
 664  * to set the DAC or the pseudo_palette.  However, the bitmap is packed, ie,
 665  * each byte contains color information for two pixels (upper and lower nibble).
 666  * To be consistent with fb_imageblit() usage, we therefore separate the two
 667  * nibbles into separate bytes. The "depth" flag will be set to 4.
 668  *
 669  * Case 3 - linux_logo_mono:
 670  * This is similar with Case 2.  Each byte contains information for 8 pixels.
 671  * We isolate each bit and expand each into a byte. The "depth" flag will
 672  * be set to 1.
 673  */
 674 static struct logo_data {
 675         int depth;
 676         int needs_directpalette;
 677         int needs_truepalette;
 678         int needs_cmapreset;
 679         const struct linux_logo *logo;
 680 } fb_logo;
 681
 682 int fb_prepare_logo(struct fb_info *info)
 683 {
 684         memset(&fb_logo, 0, sizeof(struct logo_data));
 685
 686         switch (info->fix.visual) {
 687         case FB_VISUAL_TRUECOLOR:
 688                 if (info->var.bits_per_pixel >= 8)
 689                         fb_logo.needs_truepalette = 1;
 690                 break;
 691         case FB_VISUAL_DIRECTCOLOR:
 692                 if (info->var.bits_per_pixel >= 24) {
 693                         fb_logo.needs_directpalette = 1;
 694                         fb_logo.needs_cmapreset = 1;
 695                 }
 696                 break;
 697         case FB_VISUAL_PSEUDOCOLOR:
 698                 fb_logo.needs_cmapreset = 1;
 699                 break;
 700         }
 701
 702         /* Return if no suitable logo was found */
 703         fb_logo.logo = fb_find_logo(info->var.bits_per_pixel);
 704
 705         if (!fb_logo.logo || fb_logo.logo->height > info->var.yres) {
 706                 fb_logo.logo = NULL;
 707                 return 0;
 708         }
 709         /* What depth we asked for might be different from what we get */
 710         if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
 711                 fb_logo.depth = 8;
 712         else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
 713                 fb_logo.depth = 4;
 714         else
 715                 fb_logo.depth = 1;
 716         return fb_logo.logo->height;
 717 }
 718
 719 int fb_show_logo(struct fb_info *info)
 720 {
 721         u32 *palette = NULL, *saved_pseudo_palette = NULL;
 722         unsigned char *logo_new = NULL;
 723         struct fb_image image;
 724         int x;
 725
 726         /* Return if the frame buffer is not mapped or suspended */
 727         if (fb_logo.logo == NULL || info->state != FBINFO_STATE_RUNNING)
 728                 return 0;
 729
 730         image.depth = fb_logo.depth;
 731         image.data = fb_logo.logo->data;
 732
 733         if (fb_logo.needs_cmapreset)
 734                 fb_set_logocmap(info, fb_logo.logo);
 735
 736         if (fb_logo.needs_truepalette ||
 737             fb_logo.needs_directpalette) {
 738                 palette = kmalloc(256 * 4, GFP_KERNEL);
 739                 if (palette == NULL)
 740                         return 0;
 741
 742                 if (fb_logo.needs_truepalette)
 743                         fb_set_logo_truepalette(info, fb_logo.logo, palette);
 744                 else
 745                         fb_set_logo_directpalette(info, fb_logo.logo, palette);
 746
 747                 saved_pseudo_palette = info->pseudo_palette;
 748                 info->pseudo_palette = palette;
 749         }
 750
 751         if (fb_logo.depth == 4) {
 752                 logo_new = kmalloc(fb_logo.logo->width * fb_logo.logo->height,
 753                                    GFP_KERNEL);
 754                 if (logo_new == NULL) {
 755                         if (palette)
 756                                 kfree(palette);
 757                         if (saved_pseudo_palette)
 758                                 info->pseudo_palette = saved_pseudo_palette;
 759                         return 0;
 760                 }
 761                 image.data = logo_new;
 762                 fb_set_logo(info, fb_logo.logo, logo_new, fb_logo.depth);
 763         }
 764
 765         image.width = fb_logo.logo->width;
 766         image.height = fb_logo.logo->height;
 767         image.dy = 0;
 768
 769         for (x = 0; x < num_online_cpus() * (fb_logo.logo->width + 8) &&
 770              x <= info->var.xres-fb_logo.logo->width; x += (fb_logo.logo->width + 8)) {
 771                 image.dx = x;
 772                 info->fbops->fb_imageblit(info, &image);
 773         }
 774
 775         if (palette != NULL)
 776                 kfree(palette);
 777         if (saved_pseudo_palette != NULL)
 778                 info->pseudo_palette = saved_pseudo_palette;
 779         if (logo_new != NULL)
 780                 kfree(logo_new);
 781         return fb_logo.logo->height;
 782 }
 783 #else
 784 int fb_prepare_logo(struct fb_info *info) { return 0; }
 785 int fb_show_logo(struct fb_info *info) { return 0; }
 786 #endif /* CONFIG_LOGO */
 787
 788 static int fbmem_read_proc(char *buf, char **start, off_t offset,
 789                            int len, int *eof, void *private)
 790 {
 791         struct fb_info **fi;
 792         int clen;
 793
 794         clen = 0;
 795         for (fi = registered_fb; fi < &registered_fb[FB_MAX] && len < 4000; fi++)
 796                 if (*fi)
 797                         clen += sprintf(buf + clen, "%d %s\n",
 798                                         (*fi)->node,
 799                                         (*fi)->fix.id);
 800         *start = buf + offset;
 801         if (clen > offset)
 802                 clen -= offset;
 803         else
 804                 clen = 0;
 805         return clen < len ? clen : len;
 806 }
 807
 808 static ssize_t
 809 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 810 {
 811         unsigned long p = *ppos;
 812         struct inode *inode = file->f_dentry->d_inode;
 813         int fbidx = iminor(inode);
 814         struct fb_info *info = registered_fb[fbidx];
 815
 816         if (!info || ! info->screen_base)
 817                 return -ENODEV;
 818
 819         if (info->state != FBINFO_STATE_RUNNING)
 820                 return -EPERM;
 821
 822         if (info->fbops->fb_read)
 823                 return info->fbops->fb_read(file, buf, count, ppos);
 824
 825         if (p >= info->fix.smem_len)
 826             return 0;
 827         if (count >= info->fix.smem_len)
 828             count = info->fix.smem_len;
 829         if (count + p > info->fix.smem_len)
 830                 count = info->fix.smem_len - p;
 831         if (info->fbops->fb_sync)
 832                 info->fbops->fb_sync(info);
 833         if (count) {
 834             char *base_addr;
 835
 836             base_addr = info->screen_base;
 837             count -= copy_to_user(buf, base_addr+p, count);
 838             if (!count)
 839                 return -EFAULT;
 840             *ppos += count;
 841         }
 842         return count;
 843 }
 844
 845 static ssize_t
 846 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 847 {
 848         unsigned long p = *ppos;
 849         struct inode *inode = file->f_dentry->d_inode;
 850         int fbidx = iminor(inode);
 851         struct fb_info *info = registered_fb[fbidx];
 852         int err;
 853
 854         if (!info || !info->screen_base)
 855                 return -ENODEV;
 856
 857         if (info->state != FBINFO_STATE_RUNNING)
 858                 return -EPERM;
 859
 860         if (info->fbops->fb_write)
 861                 return info->fbops->fb_write(file, buf, count, ppos);
 862
 863         if (p > info->fix.smem_len)
 864             return -ENOSPC;
 865         if (count >= info->fix.smem_len)
 866             count = info->fix.smem_len;
 867         err = 0;
 868         if (count + p > info->fix.smem_len) {
 869             count = info->fix.smem_len - p;
 870             err = -ENOSPC;
 871         }
 872         if (info->fbops->fb_sync)
 873                 info->fbops->fb_sync(info);
 874         if (count) {
 875             char *base_addr;
 876
 877             base_addr = info->screen_base;
 878             count -= copy_from_user(base_addr+p, buf, count);
 879             *ppos += count;
 880             err = -EFAULT;
 881         }
 882         if (count)
 883                 return count;
 884         return err;
 885 }
 886
 887 #ifdef CONFIG_KMOD
 888 static void try_to_load(int fb)
 889 {
 890         request_module("fb%d", fb);
 891 }
 892 #endif /* CONFIG_KMOD */
 893
 894 void
 895 fb_load_cursor_image(struct fb_info *info)
 896 {
 897         unsigned int width = (info->cursor.image.width + 7) >> 3;
 898         u8 *data = (u8 *) info->cursor.image.data;
 899
 900         info->sprite.outbuf(info, info->sprite.addr, data, width);
 901 }
 902
 903 int
 904 fb_cursor(struct fb_info *info, struct fb_cursor *sprite)
 905 {
 906         struct fb_cursor cursor;
 907         int err;
 908
 909         if (copy_from_user(&cursor, sprite, sizeof(struct fb_cursor)))
 910                 return -EFAULT;
 911
 912         if (cursor.set & FB_CUR_SETCUR)
 913                 info->cursor.enable = 1;
 914
 915         if (cursor.set & FB_CUR_SETCMAP) {
 916                 err = fb_copy_cmap(&cursor.image.cmap, &sprite->image.cmap, 1);
 917                 if (err)
 918                         return err;
 919         }
 920
 921         if (cursor.set & FB_CUR_SETSHAPE) {
 922                 int size = ((cursor.image.width + 7) >> 3) * cursor.image.height;
 923                 char *data, *mask;
 924
 925                 if ((cursor.image.height != info->cursor.image.height) ||
 926                     (cursor.image.width != info->cursor.image.width))
 927                         cursor.set |= FB_CUR_SETSIZE;
 928
 929                 data = kmalloc(size, GFP_KERNEL);
 930                 if (!data)
 931                         return -ENOMEM;
 932
 933                 mask = kmalloc(size, GFP_KERNEL);
 934                 if (!mask) {
 935                         kfree(data);
 936                         return -ENOMEM;
 937                 }
 938
 939                 if (copy_from_user(data, sprite->image.data, size) ||
 940                     copy_from_user(mask, sprite->mask, size)) {
 941                         kfree(data);
 942                         kfree(mask);
 943                         return -EFAULT;
 944                 }
 945                 cursor.image.data = data;
 946                 cursor.mask = mask;
 947         }
 948         info->cursor.set = cursor.set;
 949         info->cursor.rop = cursor.rop;
 950         err = info->fbops->fb_cursor(info, &cursor);
 951         return err;
 952 }
 953
 954 int
 955 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
 956 {
 957         int xoffset = var->xoffset;
 958         int yoffset = var->yoffset;
 959         int err;
 960
 961         if (xoffset < 0 || yoffset < 0 || !info->fbops->fb_pan_display ||
 962             xoffset + info->var.xres > info->var.xres_virtual ||
 963             yoffset + info->var.yres > info->var.yres_virtual)
 964                 return -EINVAL;
 965         if ((err = info->fbops->fb_pan_display(var, info)))
 966                 return err;
 967         info->var.xoffset = var->xoffset;
 968         info->var.yoffset = var->yoffset;
 969         if (var->vmode & FB_VMODE_YWRAP)
 970                 info->var.vmode |= FB_VMODE_YWRAP;
 971         else
 972                 info->var.vmode &= ~FB_VMODE_YWRAP;
 973         return 0;
 974 }
 975
 976 int
 977 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
 978 {
 979         int err;
 980
 981         if ((var->activate & FB_ACTIVATE_FORCE) ||
 982             memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
 983                 if (!info->fbops->fb_check_var) {
 984                         *var = info->var;
 985                         return 0;
 986                 }
 987
 988                 if ((err = info->fbops->fb_check_var(var, info)))
 989                         return err;
 990
 991                 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
 992                         info->var = *var;
 993
 994                         if (info->fbops->fb_set_par)
 995                                 info->fbops->fb_set_par(info);
 996
 997                         fb_pan_display(info, &info->var);
 998
 999                         fb_set_cmap(&info->cmap, 1, info);
1000
1001                         notifier_call_chain(&fb_notifier_list, FB_EVENT_MODE_CHANGE, info);
1002                 }
1003         }
1004         return 0;
1005 }
1006
1007 int
1008 fb_blank(struct fb_info *info, int blank)
1009 {
1010         /* ??? Variable sized stack allocation.  */
1011         u16 black[info->cmap.len];
1012         struct fb_cmap cmap;
1013
1014         if (info->fbops->fb_blank && !info->fbops->fb_blank(blank, info))
1015                 return 0;
1016         if (blank) {
1017                 memset(black, 0, info->cmap.len * sizeof(u16));
1018                 cmap.red = cmap.green = cmap.blue = black;
1019                 cmap.transp = info->cmap.transp ? black : NULL;
1020                 cmap.start = info->cmap.start;
1021                 cmap.len = info->cmap.len;
1022         } else
1023                 cmap = info->cmap;
1024         return fb_set_cmap(&cmap, 1, info);
1025 }
1026
1027 static int
1028 fb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
1029          unsigned long arg)
1030 {
1031         int fbidx = iminor(inode);
1032         struct fb_info *info = registered_fb[fbidx];
1033         struct fb_ops *fb = info->fbops;
1034         struct fb_var_screeninfo var;
1035         struct fb_fix_screeninfo fix;
1036 #ifdef CONFIG_FRAMEBUFFER_CONSOLE
1037         struct fb_con2fbmap con2fb;
1038 #endif
1039         struct fb_cmap cmap;
1040         int i;
1041
1042         if (!fb)
1043                 return -ENODEV;
1044         switch (cmd) {
1045         case FBIOGET_VSCREENINFO:
1046                 return copy_to_user((void *) arg, &info->var,
1047                                     sizeof(var)) ? -EFAULT : 0;
1048         case FBIOPUT_VSCREENINFO:
1049                 if (copy_from_user(&var, (void *) arg, sizeof(var)))
1050                         return -EFAULT;
1051                 acquire_console_sem();
1052                 i = fb_set_var(info, &var);
1053                 release_console_sem();
1054                 if (i) return i;
1055                 if (copy_to_user((void *) arg, &var, sizeof(var)))
1056                         return -EFAULT;
1057                 return 0;
1058         case FBIOGET_FSCREENINFO:
1059                 return copy_to_user((void *) arg, &info->fix,
1060                                     sizeof(fix)) ? -EFAULT : 0;
1061         case FBIOPUTCMAP:
1062                 if (copy_from_user(&cmap, (void *) arg, sizeof(cmap)))
1063                         return -EFAULT;
1064                 return (fb_set_cmap(&cmap, 0, info));
1065         case FBIOGETCMAP:
1066                 if (copy_from_user(&cmap, (void *) arg, sizeof(cmap)))
1067                         return -EFAULT;
1068                 return (fb_copy_cmap(&info->cmap, &cmap, 2));
1069         case FBIOPAN_DISPLAY:
1070                 if (copy_from_user(&var, (void *) arg, sizeof(var)))
1071                         return -EFAULT;
1072                 acquire_console_sem();
1073                 i = fb_pan_display(info, &var);
1074                 release_console_sem();
1075                 if (i)
1076                         return i;
1077                 if (copy_to_user((void *) arg, &var, sizeof(var)))
1078                         return -EFAULT;
1079                 return 0;
1080         case FBIO_CURSOR:
1081                 acquire_console_sem();
1082                 i = fb_cursor(info, (struct fb_cursor *) arg);
1083                 release_console_sem();
1084                 return i;
1085 #ifdef CONFIG_FRAMEBUFFER_CONSOLE
1086         case FBIOGET_CON2FBMAP:
1087                 if (copy_from_user(&con2fb, (void *)arg, sizeof(con2fb)))
1088                         return -EFAULT;
1089                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1090                     return -EINVAL;
1091                 con2fb.framebuffer = con2fb_map[con2fb.console-1];
1092                 return copy_to_user((void *)arg, &con2fb,
1093                                     sizeof(con2fb)) ? -EFAULT : 0;
1094         case FBIOPUT_CON2FBMAP:
1095                 if (copy_from_user(&con2fb, (void *)arg, sizeof(con2fb)))
1096                         return - EFAULT;
1097                 if (con2fb.console < 0 || con2fb.console > MAX_NR_CONSOLES)
1098                     return -EINVAL;
1099                 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
1100                     return -EINVAL;
1101 #ifdef CONFIG_KMOD
1102                 if (!registered_fb[con2fb.framebuffer])
1103                     try_to_load(con2fb.framebuffer);
1104 #endif /* CONFIG_KMOD */
1105                 if (!registered_fb[con2fb.framebuffer])
1106                     return -EINVAL;
1107                 if (con2fb.console != 0)
1108                         set_con2fb_map(con2fb.console-1, con2fb.framebuffer);
1109                 else
1110                         fb_console_init();
1111                 return 0;
1112 #endif  /* CONFIG_FRAMEBUFFER_CONSOLE */
1113         case FBIOBLANK:
1114                 acquire_console_sem();
1115                 i = fb_blank(info, arg);
1116                 release_console_sem();
1117                 return i;
1118         default:
1119                 if (fb->fb_ioctl == NULL)
1120                         return -EINVAL;
1121                 return fb->fb_ioctl(inode, file, cmd, arg, info);
1122         }
1123 }
1124
1125 static int
1126 fb_mmap(struct file *file, struct vm_area_struct * vma)
1127 {
1128         int fbidx = iminor(file->f_dentry->d_inode);
1129         struct fb_info *info = registered_fb[fbidx];
1130         struct fb_ops *fb = info->fbops;
1131         unsigned long off;
1132 #if !defined(__sparc__) || defined(__sparc_v9__)
1133         unsigned long start;
1134         u32 len;
1135 #endif
1136
1137         if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
1138                 return -EINVAL;
1139         off = vma->vm_pgoff << PAGE_SHIFT;
1140         if (!fb)
1141                 return -ENODEV;
1142         if (fb->fb_mmap) {
1143                 int res;
1144                 lock_kernel();
1145                 res = fb->fb_mmap(info, file, vma);
1146                 unlock_kernel();
1147                 return res;
1148         }
1149
1150 #if defined(__sparc__) && !defined(__sparc_v9__)
1151         /* Should never get here, all fb drivers should have their own
1152            mmap routines */
1153         return -EINVAL;
1154 #else
1155         /* !sparc32... */
1156         lock_kernel();
1157
1158         /* frame buffer memory */
1159         start = info->fix.smem_start;
1160         len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
1161         if (off >= len) {
1162                 /* memory mapped io */
1163                 off -= len;
1164                 if (info->var.accel_flags) {
1165                         unlock_kernel();
1166                         return -EINVAL;
1167                 }
1168                 start = info->fix.mmio_start;
1169                 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
1170         }
1171         unlock_kernel();
1172         start &= PAGE_MASK;
1173         if ((vma->vm_end - vma->vm_start + off) > len)
1174                 return -EINVAL;
1175         off += start;
1176         vma->vm_pgoff = off >> PAGE_SHIFT;
1177         /* This is an IO map - tell maydump to skip this VMA */
1178         vma->vm_flags |= VM_IO;
1179 #if defined(__sparc_v9__)
1180         vma->vm_flags |= (VM_SHM | VM_LOCKED);
1181         if (io_remap_page_range(vma, vma->vm_start, off,
1182                                 vma->vm_end - vma->vm_start, vma->vm_page_prot, 0))
1183                 return -EAGAIN;
1184 #else
1185 #if defined(__mc68000__)
1186 #if defined(CONFIG_SUN3)
1187         pgprot_val(vma->vm_page_prot) |= SUN3_PAGE_NOCACHE;
1188 #elif defined(CONFIG_MMU)
1189         if (CPU_IS_020_OR_030)
1190                 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE030;
1191         if (CPU_IS_040_OR_060) {
1192                 pgprot_val(vma->vm_page_prot) &= _CACHEMASK040;
1193                 /* Use no-cache mode, serialized */
1194                 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE_S;
1195         }
1196 #endif
1197 #elif defined(__powerpc__)
1198         pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE|_PAGE_GUARDED;
1199 #elif defined(__alpha__)
1200         /* Caching is off in the I/O space quadrant by design.  */
1201 #elif defined(__i386__) || defined(__x86_64__)
1202         if (boot_cpu_data.x86 > 3)
1203                 pgprot_val(vma->vm_page_prot) |= _PAGE_PCD;
1204 #elif defined(__mips__)
1205         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1206 #elif defined(__hppa__)
1207         pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
1208 #elif defined(__ia64__) || defined(__arm__) || defined(__sh__)
1209         vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
1210 #else
1211 #warning What do we have to do here??
1212 #endif
1213         if (io_remap_page_range(vma, vma->vm_start, off,
1214                              vma->vm_end - vma->vm_start, vma->vm_page_prot))
1215                 return -EAGAIN;
1216 #endif /* !__sparc_v9__ */
1217         return 0;
1218 #endif /* !sparc32 */
1219 }
1220
1221 static int
1222 fb_open(struct inode *inode, struct file *file)
1223 {
1224         int fbidx = iminor(inode);
1225         struct fb_info *info;
1226         int res = 0;
1227
1228         if (fbidx >= FB_MAX)
1229                 return -ENODEV;
1230 #ifdef CONFIG_KMOD
1231         if (!(info = registered_fb[fbidx]))
1232                 try_to_load(fbidx);
1233 #endif /* CONFIG_KMOD */
1234         if (!(info = registered_fb[fbidx]))
1235                 return -ENODEV;
1236         if (!try_module_get(info->fbops->owner))
1237                 return -ENODEV;
1238         if (info->fbops->fb_open) {
1239                 res = info->fbops->fb_open(info,1);
1240                 if (res)
1241                         module_put(info->fbops->owner);
1242         }
1243         return res;
1244 }
1245
1246 static int
1247 fb_release(struct inode *inode, struct file *file)
1248 {
1249         int fbidx = iminor(inode);
1250         struct fb_info *info;
1251
1252         lock_kernel();
1253         info = registered_fb[fbidx];
1254         if (info->fbops->fb_release)
1255                 info->fbops->fb_release(info,1);
1256         module_put(info->fbops->owner);
1257         unlock_kernel();
1258         return 0;
1259 }
1260
1261 static struct file_operations fb_fops = {
1262         .owner =        THIS_MODULE,
1263         .read =         fb_read,
1264         .write =        fb_write,
1265         .ioctl =        fb_ioctl,
1266         .mmap =         fb_mmap,
1267         .open =         fb_open,
1268         .release =      fb_release,
1269 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1270         .get_unmapped_area = get_fb_unmapped_area,
1271 #endif
1272 };
1273
1274 static struct class_simple *fb_class;
1275
1276 /**
1277  *      register_framebuffer - registers a frame buffer device
1278  *      @fb_info: frame buffer info structure
1279  *
1280  *      Registers a frame buffer device @fb_info.
1281  *
1282  *      Returns negative errno on error, or zero for success.
1283  *
1284  */
1285
1286 int
1287 register_framebuffer(struct fb_info *fb_info)
1288 {
1289         int i;
1290         struct class_device *c;
1291
1292         if (num_registered_fb == FB_MAX)
1293                 return -ENXIO;
1294         num_registered_fb++;
1295         for (i = 0 ; i < FB_MAX; i++)
1296                 if (!registered_fb[i])
1297                         break;
1298         fb_info->node = i;
1299
1300         c = class_simple_device_add(fb_class, MKDEV(FB_MAJOR, i), NULL, "fb%d", i);
1301         if (IS_ERR(c)) {
1302                 /* Not fatal */
1303                 printk(KERN_WARNING "Unable to create class_device for framebuffer %d; errno = %ld\n", i, PTR_ERR(c));
1304         }
1305
1306         if (fb_info->pixmap.addr == NULL) {
1307                 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1308                 if (fb_info->pixmap.addr) {
1309                         fb_info->pixmap.size = FBPIXMAPSIZE;
1310                         fb_info->pixmap.buf_align = 1;
1311                         fb_info->pixmap.scan_align = 1;
1312                         fb_info->pixmap.access_align = 4;
1313                         fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1314                 }
1315         }
1316         fb_info->pixmap.offset = 0;
1317         if (fb_info->pixmap.outbuf == NULL)
1318                 fb_info->pixmap.outbuf = fb_sys_outbuf;
1319         if (fb_info->pixmap.inbuf == NULL)
1320                 fb_info->pixmap.inbuf = fb_sys_inbuf;
1321
1322         if (fb_info->sprite.addr == NULL) {
1323                 fb_info->sprite.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1324                 if (fb_info->sprite.addr) {
1325                         fb_info->sprite.size = FBPIXMAPSIZE;
1326                         fb_info->sprite.buf_align = 1;
1327                         fb_info->sprite.scan_align = 1;
1328                         fb_info->sprite.access_align = 4;
1329                         fb_info->sprite.flags = FB_PIXMAP_DEFAULT;
1330                 }
1331         }
1332         fb_info->sprite.offset = 0;
1333         if (fb_info->sprite.outbuf == NULL)
1334                 fb_info->sprite.outbuf = fb_sys_outbuf;
1335         if (fb_info->sprite.inbuf == NULL)
1336                 fb_info->sprite.inbuf = fb_sys_inbuf;
1337
1338         registered_fb[i] = fb_info;
1339
1340         devfs_mk_cdev(MKDEV(FB_MAJOR, i),
1341                         S_IFCHR | S_IRUGO | S_IWUGO, "fb/%d", i);
1342         return 0;
1343 }
1344
1345
1346 /**
1347  *      unregister_framebuffer - releases a frame buffer device
1348  *      @fb_info: frame buffer info structure
1349  *
1350  *      Unregisters a frame buffer device @fb_info.
1351  *
1352  *      Returns negative errno on error, or zero for success.
1353  *
1354  */
1355
1356 int
1357 unregister_framebuffer(struct fb_info *fb_info)
1358 {
1359         int i;
1360
1361         i = fb_info->node;
1362         if (!registered_fb[i])
1363                 return -EINVAL;
1364         devfs_remove("fb/%d", i);
1365
1366         if (fb_info->pixmap.addr && (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1367                 kfree(fb_info->pixmap.addr);
1368         if (fb_info->sprite.addr && (fb_info->sprite.flags & FB_PIXMAP_DEFAULT))
1369                 kfree(fb_info->sprite.addr);
1370         registered_fb[i]=NULL;
1371         num_registered_fb--;
1372         class_simple_device_remove(MKDEV(FB_MAJOR, i));
1373         return 0;
1374 }
1375
1376 /**
1377  *      fb_register_client - register a client notifier
1378  *      @nb: notifier block to callback on events
1379  */
1380 int fb_register_client(struct notifier_block *nb)
1381 {
1382         return notifier_chain_register(&fb_notifier_list, nb);
1383 }
1384
1385 /**
1386  *      fb_unregister_client - unregister a client notifier
1387  *      @nb: notifier block to callback on events
1388  */
1389 int fb_unregister_client(struct notifier_block *nb)
1390 {
1391         return notifier_chain_unregister(&fb_notifier_list, nb);
1392 }
1393
1394 /**
1395  *      fb_set_suspend - low level driver signals suspend
1396  *      @info: framebuffer affected
1397  *      @state: 0 = resuming, !=0 = suspending
1398  *
1399  *      This is meant to be used by low level drivers to
1400  *      signal suspend/resume to the core & clients.
1401  *      It must be called with the console semaphore held
1402  */
1403 void fb_set_suspend(struct fb_info *info, int state)
1404 {
1405         if (state) {
1406                 notifier_call_chain(&fb_notifier_list, FB_EVENT_SUSPEND, info);
1407                 info->state = FBINFO_STATE_SUSPENDED;
1408         } else {
1409                 info->state = FBINFO_STATE_RUNNING;
1410                 notifier_call_chain(&fb_notifier_list, FB_EVENT_RESUME, info);
1411         }
1412 }
1413
1414 /**
1415  *      fbmem_init - init frame buffer subsystem
1416  *
1417  *      Initialize the frame buffer subsystem.
1418  *
1419  *      NOTE: This function is _only_ to be called by drivers/char/mem.c.
1420  *
1421  */
1422
1423 void __init
1424 fbmem_init(void)
1425 {
1426         int i;
1427
1428         create_proc_read_entry("fb", 0, 0, fbmem_read_proc, NULL);
1429
1430         devfs_mk_dir("fb");
1431         if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1432                 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1433
1434         fb_class = class_simple_create(THIS_MODULE, "graphics");
1435         if (IS_ERR(fb_class)) {
1436                 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1437                 fb_class = NULL;
1438         }
1439
1440 #ifdef CONFIG_FB_OF
1441         if (ofonly) {
1442                 offb_init();
1443                 return;
1444         }
1445 #endif
1446
1447         /*
1448          *  Probe for all builtin frame buffer devices
1449          */
1450         for (i = 0; i < num_pref_init_funcs; i++)
1451                 pref_init_funcs[i]();
1452
1453         for (i = 0; i < NUM_FB_DRIVERS; i++)
1454                 if (fb_drivers[i].init)
1455                         fb_drivers[i].init();
1456 }
1457
1458
1459 /**
1460  *      video_setup - process command line options
1461  *      @options: string of options
1462  *
1463  *      Process command line options for frame buffer subsystem.
1464  *
1465  *      NOTE: This function is a __setup and __init function.
1466  *
1467  *      Returns zero.
1468  *
1469  */
1470
1471 int __init video_setup(char *options)
1472 {
1473         int i, j;
1474
1475         if (!options || !*options)
1476                 return 0;
1477
1478 #ifdef CONFIG_FB_OF
1479         if (!strcmp(options, "ofonly")) {
1480                 ofonly = 1;
1481                 return 0;
1482         }
1483 #endif
1484
1485         if (num_pref_init_funcs == FB_MAX)
1486                 return 0;
1487
1488         for (i = 0; i < NUM_FB_DRIVERS; i++) {
1489                 j = strlen(fb_drivers[i].name);
1490                 if (!strncmp(options, fb_drivers[i].name, j) &&
1491                         options[j] == ':') {
1492                         if (!strcmp(options+j+1, "off"))
1493                                 fb_drivers[i].init = NULL;
1494                         else {
1495                                 if (fb_drivers[i].init) {
1496                                         pref_init_funcs[num_pref_init_funcs++] =
1497                                                 fb_drivers[i].init;
1498                                         fb_drivers[i].init = NULL;
1499                                 }
1500                                 if (fb_drivers[i].setup)
1501                                         fb_drivers[i].setup(options+j+1);
1502                         }
1503                         return 0;
1504                 }
1505         }
1506
1507         /*
1508          * If we get here no fb was specified.
1509          * We consider the argument to be a global video mode option.
1510          */
1511         global_mode_option = options;
1512         return 0;
1513 }
1514
1515 __setup("video=", video_setup);
1516
1517     /*
1518      *  Visible symbols for modules
1519      */
1520
1521 EXPORT_SYMBOL(register_framebuffer);
1522 EXPORT_SYMBOL(unregister_framebuffer);
1523 EXPORT_SYMBOL(num_registered_fb);
1524 EXPORT_SYMBOL(registered_fb);
1525 EXPORT_SYMBOL(fb_prepare_logo);
1526 EXPORT_SYMBOL(fb_show_logo);
1527 EXPORT_SYMBOL(fb_set_var);
1528 EXPORT_SYMBOL(fb_blank);
1529 EXPORT_SYMBOL(fb_pan_display);
1530 EXPORT_SYMBOL(fb_get_buffer_offset);
1531 EXPORT_SYMBOL(fb_move_buf_unaligned);
1532 EXPORT_SYMBOL(fb_move_buf_aligned);
1533 EXPORT_SYMBOL(fb_load_cursor_image);
1534 EXPORT_SYMBOL(fb_set_suspend);
1535 EXPORT_SYMBOL(fb_register_client);
1536 EXPORT_SYMBOL(fb_unregister_client);
1537
1538 MODULE_LICENSE("GPL");