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