drivers/pcmcia/cistpl.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * cistpl.c -- 16-bit PCMCIA Card Information Structure parser
   4  *
   5  * The initial developer of the original code is David A. Hinds
   6  * <dahinds@users.sourceforge.net>.  Portions created by David A. Hinds
   7  * are Copyright (C) 1999 David A. Hinds.  All Rights Reserved.
   8  *
   9  * (C) 1999             David A. Hinds
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/moduleparam.h>
  14 #include <linux/kernel.h>
  15 #include <linux/string.h>
  16 #include <linux/major.h>
  17 #include <linux/errno.h>
  18 #include <linux/timer.h>
  19 #include <linux/slab.h>
  20 #include <linux/mm.h>
  21 #include <linux/pci.h>
  22 #include <linux/ioport.h>
  23 #include <linux/io.h>
  24 #include <linux/security.h>
  25 #include <asm/byteorder.h>
  26 #include <asm/unaligned.h>
  27
  28 #include <pcmcia/ss.h>
  29 #include <pcmcia/cisreg.h>
  30 #include <pcmcia/cistpl.h>
  31 #include <pcmcia/ds.h>
  32 #include "cs_internal.h"
  33
  34 static const u_char mantissa[] = {
  35     10, 12, 13, 15, 20, 25, 30, 35,
  36     40, 45, 50, 55, 60, 70, 80, 90
  37 };
  38
  39 static const u_int exponent[] = {
  40     1, 10, 100, 1000, 10000, 100000, 1000000, 10000000
  41 };
  42
  43 /* Convert an extended speed byte to a time in nanoseconds */
  44 #define SPEED_CVT(v) \
  45     (mantissa[(((v)>>3)&15)-1] * exponent[(v)&7] / 10)
  46 /* Convert a power byte to a current in 0.1 microamps */
  47 #define POWER_CVT(v) \
  48     (mantissa[((v)>>3)&15] * exponent[(v)&7] / 10)
  49 #define POWER_SCALE(v)          (exponent[(v)&7])
  50
  51 /* Upper limit on reasonable # of tuples */
  52 #define MAX_TUPLES              200
  53
  54 /* Bits in IRQInfo1 field */
  55 #define IRQ_INFO2_VALID         0x10
  56
  57 /* 16-bit CIS? */
  58 static int cis_width;
  59 module_param(cis_width, int, 0444);
  60
  61 void release_cis_mem(struct pcmcia_socket *s)
  62 {
  63         mutex_lock(&s->ops_mutex);
  64         if (s->cis_mem.flags & MAP_ACTIVE) {
  65                 s->cis_mem.flags &= ~MAP_ACTIVE;
  66                 s->ops->set_mem_map(s, &s->cis_mem);
  67                 if (s->cis_mem.res) {
  68                         release_resource(s->cis_mem.res);
  69                         kfree(s->cis_mem.res);
  70                         s->cis_mem.res = NULL;
  71                 }
  72                 iounmap(s->cis_virt);
  73                 s->cis_virt = NULL;
  74         }
  75         mutex_unlock(&s->ops_mutex);
  76 }
  77
  78 /**
  79  * set_cis_map() - map the card memory at "card_offset" into virtual space.
  80  *
  81  * If flags & MAP_ATTRIB, map the attribute space, otherwise
  82  * map the memory space.
  83  *
  84  * Must be called with ops_mutex held.
  85  */
  86 static void __iomem *set_cis_map(struct pcmcia_socket *s,
  87                                 unsigned int card_offset, unsigned int flags)
  88 {
  89         pccard_mem_map *mem = &s->cis_mem;
  90         int ret;
  91
  92         if (!(s->features & SS_CAP_STATIC_MAP) && (mem->res == NULL)) {
  93                 mem->res = pcmcia_find_mem_region(0, s->map_size,
  94                                                 s->map_size, 0, s);
  95                 if (mem->res == NULL) {
  96                         dev_notice(&s->dev, "cs: unable to map card memory!\n");
  97                         return NULL;
  98                 }
  99                 s->cis_virt = NULL;
 100         }
 101
 102         if (!(s->features & SS_CAP_STATIC_MAP) && (!s->cis_virt))
 103                 s->cis_virt = ioremap(mem->res->start, s->map_size);
 104
 105         mem->card_start = card_offset;
 106         mem->flags = flags;
 107
 108         ret = s->ops->set_mem_map(s, mem);
 109         if (ret) {
 110                 iounmap(s->cis_virt);
 111                 s->cis_virt = NULL;
 112                 return NULL;
 113         }
 114
 115         if (s->features & SS_CAP_STATIC_MAP) {
 116                 if (s->cis_virt)
 117                         iounmap(s->cis_virt);
 118                 s->cis_virt = ioremap(mem->static_start, s->map_size);
 119         }
 120
 121         return s->cis_virt;
 122 }
 123
 124
 125 /* Bits in attr field */
 126 #define IS_ATTR         1
 127 #define IS_INDIRECT     8
 128
 129 /**
 130  * pcmcia_read_cis_mem() - low-level function to read CIS memory
 131  *
 132  * must be called with ops_mutex held
 133  */
 134 int pcmcia_read_cis_mem(struct pcmcia_socket *s, int attr, u_int addr,
 135                  u_int len, void *ptr)
 136 {
 137         void __iomem *sys, *end;
 138         unsigned char *buf = ptr;
 139
 140         dev_dbg(&s->dev, "pcmcia_read_cis_mem(%d, %#x, %u)\n", attr, addr, len);
 141
 142         if (attr & IS_INDIRECT) {
 143                 /* Indirect accesses use a bunch of special registers at fixed
 144                    locations in common memory */
 145                 u_char flags = ICTRL0_COMMON|ICTRL0_AUTOINC|ICTRL0_BYTEGRAN;
 146                 if (attr & IS_ATTR) {
 147                         addr *= 2;
 148                         flags = ICTRL0_AUTOINC;
 149                 }
 150
 151                 sys = set_cis_map(s, 0, MAP_ACTIVE |
 152                                 ((cis_width) ? MAP_16BIT : 0));
 153                 if (!sys) {
 154                         dev_dbg(&s->dev, "could not map memory\n");
 155                         memset(ptr, 0xff, len);
 156                         return -1;
 157                 }
 158
 159                 writeb(flags, sys+CISREG_ICTRL0);
 160                 writeb(addr & 0xff, sys+CISREG_IADDR0);
 161                 writeb((addr>>8) & 0xff, sys+CISREG_IADDR1);
 162                 writeb((addr>>16) & 0xff, sys+CISREG_IADDR2);
 163                 writeb((addr>>24) & 0xff, sys+CISREG_IADDR3);
 164                 for ( ; len > 0; len--, buf++)
 165                         *buf = readb(sys+CISREG_IDATA0);
 166         } else {
 167                 u_int inc = 1, card_offset, flags;
 168
 169                 if (addr > CISTPL_MAX_CIS_SIZE) {
 170                         dev_dbg(&s->dev,
 171                                 "attempt to read CIS mem at addr %#x", addr);
 172                         memset(ptr, 0xff, len);
 173                         return -1;
 174                 }
 175
 176                 flags = MAP_ACTIVE | ((cis_width) ? MAP_16BIT : 0);
 177                 if (attr) {
 178                         flags |= MAP_ATTRIB;
 179                         inc++;
 180                         addr *= 2;
 181                 }
 182
 183                 card_offset = addr & ~(s->map_size-1);
 184                 while (len) {
 185                         sys = set_cis_map(s, card_offset, flags);
 186                         if (!sys) {
 187                                 dev_dbg(&s->dev, "could not map memory\n");
 188                                 memset(ptr, 0xff, len);
 189                                 return -1;
 190                         }
 191                         end = sys + s->map_size;
 192                         sys = sys + (addr & (s->map_size-1));
 193                         for ( ; len > 0; len--, buf++, sys += inc) {
 194                                 if (sys == end)
 195                                         break;
 196                                 *buf = readb(sys);
 197                         }
 198                         card_offset += s->map_size;
 199                         addr = 0;
 200                 }
 201         }
 202         dev_dbg(&s->dev, "  %#2.2x %#2.2x %#2.2x %#2.2x ...\n",
 203                 *(u_char *)(ptr+0), *(u_char *)(ptr+1),
 204                 *(u_char *)(ptr+2), *(u_char *)(ptr+3));
 205         return 0;
 206 }
 207
 208
 209 /**
 210  * pcmcia_write_cis_mem() - low-level function to write CIS memory
 211  *
 212  * Probably only useful for writing one-byte registers. Must be called
 213  * with ops_mutex held.
 214  */
 215 int pcmcia_write_cis_mem(struct pcmcia_socket *s, int attr, u_int addr,
 216                    u_int len, void *ptr)
 217 {
 218         void __iomem *sys, *end;
 219         unsigned char *buf = ptr;
 220
 221         dev_dbg(&s->dev,
 222                 "pcmcia_write_cis_mem(%d, %#x, %u)\n", attr, addr, len);
 223
 224         if (attr & IS_INDIRECT) {
 225                 /* Indirect accesses use a bunch of special registers at fixed
 226                    locations in common memory */
 227                 u_char flags = ICTRL0_COMMON|ICTRL0_AUTOINC|ICTRL0_BYTEGRAN;
 228                 if (attr & IS_ATTR) {
 229                         addr *= 2;
 230                         flags = ICTRL0_AUTOINC;
 231                 }
 232
 233                 sys = set_cis_map(s, 0, MAP_ACTIVE |
 234                                 ((cis_width) ? MAP_16BIT : 0));
 235                 if (!sys) {
 236                         dev_dbg(&s->dev, "could not map memory\n");
 237                         return -EINVAL;
 238                 }
 239
 240                 writeb(flags, sys+CISREG_ICTRL0);
 241                 writeb(addr & 0xff, sys+CISREG_IADDR0);
 242                 writeb((addr>>8) & 0xff, sys+CISREG_IADDR1);
 243                 writeb((addr>>16) & 0xff, sys+CISREG_IADDR2);
 244                 writeb((addr>>24) & 0xff, sys+CISREG_IADDR3);
 245                 for ( ; len > 0; len--, buf++)
 246                         writeb(*buf, sys+CISREG_IDATA0);
 247         } else {
 248                 u_int inc = 1, card_offset, flags;
 249
 250                 flags = MAP_ACTIVE | ((cis_width) ? MAP_16BIT : 0);
 251                 if (attr & IS_ATTR) {
 252                         flags |= MAP_ATTRIB;
 253                         inc++;
 254                         addr *= 2;
 255                 }
 256
 257                 card_offset = addr & ~(s->map_size-1);
 258                 while (len) {
 259                         sys = set_cis_map(s, card_offset, flags);
 260                         if (!sys) {
 261                                 dev_dbg(&s->dev, "could not map memory\n");
 262                                 return -EINVAL;
 263                         }
 264
 265                         end = sys + s->map_size;
 266                         sys = sys + (addr & (s->map_size-1));
 267                         for ( ; len > 0; len--, buf++, sys += inc) {
 268                                 if (sys == end)
 269                                         break;
 270                                 writeb(*buf, sys);
 271                         }
 272                         card_offset += s->map_size;
 273                         addr = 0;
 274                 }
 275         }
 276         return 0;
 277 }
 278
 279
 280 /**
 281  * read_cis_cache() - read CIS memory or its associated cache
 282  *
 283  * This is a wrapper around read_cis_mem, with the same interface,
 284  * but which caches information, for cards whose CIS may not be
 285  * readable all the time.
 286  */
 287 static int read_cis_cache(struct pcmcia_socket *s, int attr, u_int addr,
 288                         size_t len, void *ptr)
 289 {
 290         struct cis_cache_entry *cis;
 291         int ret = 0;
 292
 293         if (s->state & SOCKET_CARDBUS)
 294                 return -EINVAL;
 295
 296         mutex_lock(&s->ops_mutex);
 297         if (s->fake_cis) {
 298                 if (s->fake_cis_len >= addr+len)
 299                         memcpy(ptr, s->fake_cis+addr, len);
 300                 else {
 301                         memset(ptr, 0xff, len);
 302                         ret = -EINVAL;
 303                 }
 304                 mutex_unlock(&s->ops_mutex);
 305                 return ret;
 306         }
 307
 308         list_for_each_entry(cis, &s->cis_cache, node) {
 309                 if (cis->addr == addr && cis->len == len && cis->attr == attr) {
 310                         memcpy(ptr, cis->cache, len);
 311                         mutex_unlock(&s->ops_mutex);
 312                         return 0;
 313                 }
 314         }
 315
 316         ret = pcmcia_read_cis_mem(s, attr, addr, len, ptr);
 317
 318         if (ret == 0) {
 319                 /* Copy data into the cache */
 320                 cis = kmalloc(sizeof(struct cis_cache_entry) + len, GFP_KERNEL);
 321                 if (cis) {
 322                         cis->addr = addr;
 323                         cis->len = len;
 324                         cis->attr = attr;
 325                         memcpy(cis->cache, ptr, len);
 326                         list_add(&cis->node, &s->cis_cache);
 327                 }
 328         }
 329         mutex_unlock(&s->ops_mutex);
 330
 331         return ret;
 332 }
 333
 334 static void
 335 remove_cis_cache(struct pcmcia_socket *s, int attr, u_int addr, u_int len)
 336 {
 337         struct cis_cache_entry *cis;
 338
 339         mutex_lock(&s->ops_mutex);
 340         list_for_each_entry(cis, &s->cis_cache, node)
 341                 if (cis->addr == addr && cis->len == len && cis->attr == attr) {
 342                         list_del(&cis->node);
 343                         kfree(cis);
 344                         break;
 345                 }
 346         mutex_unlock(&s->ops_mutex);
 347 }
 348
 349 /**
 350  * destroy_cis_cache() - destroy the CIS cache
 351  * @s:          pcmcia_socket for which CIS cache shall be destroyed
 352  *
 353  * This destroys the CIS cache but keeps any fake CIS alive. Must be
 354  * called with ops_mutex held.
 355  */
 356 void destroy_cis_cache(struct pcmcia_socket *s)
 357 {
 358         struct list_head *l, *n;
 359         struct cis_cache_entry *cis;
 360
 361         list_for_each_safe(l, n, &s->cis_cache) {
 362                 cis = list_entry(l, struct cis_cache_entry, node);
 363                 list_del(&cis->node);
 364                 kfree(cis);
 365         }
 366 }
 367
 368 /**
 369  * verify_cis_cache() - does the CIS match what is in the CIS cache?
 370  */
 371 int verify_cis_cache(struct pcmcia_socket *s)
 372 {
 373         struct cis_cache_entry *cis;
 374         char *buf;
 375         int ret;
 376
 377         if (s->state & SOCKET_CARDBUS)
 378                 return -EINVAL;
 379
 380         buf = kmalloc(256, GFP_KERNEL);
 381         if (buf == NULL) {
 382                 dev_warn(&s->dev, "no memory for verifying CIS\n");
 383                 return -ENOMEM;
 384         }
 385         mutex_lock(&s->ops_mutex);
 386         list_for_each_entry(cis, &s->cis_cache, node) {
 387                 int len = cis->len;
 388
 389                 if (len > 256)
 390                         len = 256;
 391
 392                 ret = pcmcia_read_cis_mem(s, cis->attr, cis->addr, len, buf);
 393                 if (ret || memcmp(buf, cis->cache, len) != 0) {
 394                         kfree(buf);
 395                         mutex_unlock(&s->ops_mutex);
 396                         return -1;
 397                 }
 398         }
 399         kfree(buf);
 400         mutex_unlock(&s->ops_mutex);
 401         return 0;
 402 }
 403
 404 /**
 405  * pcmcia_replace_cis() - use a replacement CIS instead of the card's CIS
 406  *
 407  * For really bad cards, we provide a facility for uploading a
 408  * replacement CIS.
 409  */
 410 int pcmcia_replace_cis(struct pcmcia_socket *s,
 411                        const u8 *data, const size_t len)
 412 {
 413         if (len > CISTPL_MAX_CIS_SIZE) {
 414                 dev_warn(&s->dev, "replacement CIS too big\n");
 415                 return -EINVAL;
 416         }
 417         mutex_lock(&s->ops_mutex);
 418         kfree(s->fake_cis);
 419         s->fake_cis = kmalloc(len, GFP_KERNEL);
 420         if (s->fake_cis == NULL) {
 421                 dev_warn(&s->dev, "no memory to replace CIS\n");
 422                 mutex_unlock(&s->ops_mutex);
 423                 return -ENOMEM;
 424         }
 425         s->fake_cis_len = len;
 426         memcpy(s->fake_cis, data, len);
 427         dev_info(&s->dev, "Using replacement CIS\n");
 428         mutex_unlock(&s->ops_mutex);
 429         return 0;
 430 }
 431
 432 /* The high-level CIS tuple services */
 433
 434 struct tuple_flags {
 435         u_int           link_space:4;
 436         u_int           has_link:1;
 437         u_int           mfc_fn:3;
 438         u_int           space:4;
 439 };
 440
 441 #define LINK_SPACE(f)   (((struct tuple_flags *)(&(f)))->link_space)
 442 #define HAS_LINK(f)     (((struct tuple_flags *)(&(f)))->has_link)
 443 #define MFC_FN(f)       (((struct tuple_flags *)(&(f)))->mfc_fn)
 444 #define SPACE(f)        (((struct tuple_flags *)(&(f)))->space)
 445
 446 int pccard_get_first_tuple(struct pcmcia_socket *s, unsigned int function,
 447                         tuple_t *tuple)
 448 {
 449         if (!s)
 450                 return -EINVAL;
 451
 452         if (!(s->state & SOCKET_PRESENT) || (s->state & SOCKET_CARDBUS))
 453                 return -ENODEV;
 454         tuple->TupleLink = tuple->Flags = 0;
 455
 456         /* Assume presence of a LONGLINK_C to address 0 */
 457         tuple->CISOffset = tuple->LinkOffset = 0;
 458         SPACE(tuple->Flags) = HAS_LINK(tuple->Flags) = 1;
 459
 460         if ((s->functions > 1) && !(tuple->Attributes & TUPLE_RETURN_COMMON)) {
 461                 cisdata_t req = tuple->DesiredTuple;
 462                 tuple->DesiredTuple = CISTPL_LONGLINK_MFC;
 463                 if (pccard_get_next_tuple(s, function, tuple) == 0) {
 464                         tuple->DesiredTuple = CISTPL_LINKTARGET;
 465                         if (pccard_get_next_tuple(s, function, tuple) != 0)
 466                                 return -ENOSPC;
 467                 } else
 468                         tuple->CISOffset = tuple->TupleLink = 0;
 469                 tuple->DesiredTuple = req;
 470         }
 471         return pccard_get_next_tuple(s, function, tuple);
 472 }
 473
 474 static int follow_link(struct pcmcia_socket *s, tuple_t *tuple)
 475 {
 476         u_char link[5];
 477         u_int ofs;
 478         int ret;
 479
 480         if (MFC_FN(tuple->Flags)) {
 481                 /* Get indirect link from the MFC tuple */
 482                 ret = read_cis_cache(s, LINK_SPACE(tuple->Flags),
 483                                 tuple->LinkOffset, 5, link);
 484                 if (ret)
 485                         return -1;
 486                 ofs = get_unaligned_le32(link + 1);
 487                 SPACE(tuple->Flags) = (link[0] == CISTPL_MFC_ATTR);
 488                 /* Move to the next indirect link */
 489                 tuple->LinkOffset += 5;
 490                 MFC_FN(tuple->Flags)--;
 491         } else if (HAS_LINK(tuple->Flags)) {
 492                 ofs = tuple->LinkOffset;
 493                 SPACE(tuple->Flags) = LINK_SPACE(tuple->Flags);
 494                 HAS_LINK(tuple->Flags) = 0;
 495         } else
 496                 return -1;
 497
 498         if (SPACE(tuple->Flags)) {
 499                 /* This is ugly, but a common CIS error is to code the long
 500                    link offset incorrectly, so we check the right spot... */
 501                 ret = read_cis_cache(s, SPACE(tuple->Flags), ofs, 5, link);
 502                 if (ret)
 503                         return -1;
 504                 if ((link[0] == CISTPL_LINKTARGET) && (link[1] >= 3) &&
 505                         (strncmp(link+2, "CIS", 3) == 0))
 506                         return ofs;
 507                 remove_cis_cache(s, SPACE(tuple->Flags), ofs, 5);
 508                 /* Then, we try the wrong spot... */
 509                 ofs = ofs >> 1;
 510         }
 511         ret = read_cis_cache(s, SPACE(tuple->Flags), ofs, 5, link);
 512         if (ret)
 513                 return -1;
 514         if ((link[0] == CISTPL_LINKTARGET) && (link[1] >= 3) &&
 515                 (strncmp(link+2, "CIS", 3) == 0))
 516                 return ofs;
 517         remove_cis_cache(s, SPACE(tuple->Flags), ofs, 5);
 518         return -1;
 519 }
 520
 521 int pccard_get_next_tuple(struct pcmcia_socket *s, unsigned int function,
 522                         tuple_t *tuple)
 523 {
 524         u_char link[2], tmp;
 525         int ofs, i, attr;
 526         int ret;
 527
 528         if (!s)
 529                 return -EINVAL;
 530         if (!(s->state & SOCKET_PRESENT) || (s->state & SOCKET_CARDBUS))
 531                 return -ENODEV;
 532
 533         link[1] = tuple->TupleLink;
 534         ofs = tuple->CISOffset + tuple->TupleLink;
 535         attr = SPACE(tuple->Flags);
 536
 537         for (i = 0; i < MAX_TUPLES; i++) {
 538                 if (link[1] == 0xff)
 539                         link[0] = CISTPL_END;
 540                 else {
 541                         ret = read_cis_cache(s, attr, ofs, 2, link);
 542                         if (ret)
 543                                 return -1;
 544                         if (link[0] == CISTPL_NULL) {
 545                                 ofs++;
 546                                 continue;
 547                         }
 548                 }
 549
 550                 /* End of chain?  Follow long link if possible */
 551                 if (link[0] == CISTPL_END) {
 552                         ofs = follow_link(s, tuple);
 553                         if (ofs < 0)
 554                                 return -ENOSPC;
 555                         attr = SPACE(tuple->Flags);
 556                         ret = read_cis_cache(s, attr, ofs, 2, link);
 557                         if (ret)
 558                                 return -1;
 559                 }
 560
 561                 /* Is this a link tuple?  Make a note of it */
 562                 if ((link[0] == CISTPL_LONGLINK_A) ||
 563                         (link[0] == CISTPL_LONGLINK_C) ||
 564                         (link[0] == CISTPL_LONGLINK_MFC) ||
 565                         (link[0] == CISTPL_LINKTARGET) ||
 566                         (link[0] == CISTPL_INDIRECT) ||
 567                         (link[0] == CISTPL_NO_LINK)) {
 568                         switch (link[0]) {
 569                         case CISTPL_LONGLINK_A:
 570                                 HAS_LINK(tuple->Flags) = 1;
 571                                 LINK_SPACE(tuple->Flags) = attr | IS_ATTR;
 572                                 ret = read_cis_cache(s, attr, ofs+2, 4,
 573                                                 &tuple->LinkOffset);
 574                                 if (ret)
 575                                         return -1;
 576                                 break;
 577                         case CISTPL_LONGLINK_C:
 578                                 HAS_LINK(tuple->Flags) = 1;
 579                                 LINK_SPACE(tuple->Flags) = attr & ~IS_ATTR;
 580                                 ret = read_cis_cache(s, attr, ofs+2, 4,
 581                                                 &tuple->LinkOffset);
 582                                 if (ret)
 583                                         return -1;
 584                                 break;
 585                         case CISTPL_INDIRECT:
 586                                 HAS_LINK(tuple->Flags) = 1;
 587                                 LINK_SPACE(tuple->Flags) = IS_ATTR |
 588                                         IS_INDIRECT;
 589                                 tuple->LinkOffset = 0;
 590                                 break;
 591                         case CISTPL_LONGLINK_MFC:
 592                                 tuple->LinkOffset = ofs + 3;
 593                                 LINK_SPACE(tuple->Flags) = attr;
 594                                 if (function == BIND_FN_ALL) {
 595                                         /* Follow all the MFC links */
 596                                         ret = read_cis_cache(s, attr, ofs+2,
 597                                                         1, &tmp);
 598                                         if (ret)
 599                                                 return -1;
 600                                         MFC_FN(tuple->Flags) = tmp;
 601                                 } else {
 602                                         /* Follow exactly one of the links */
 603                                         MFC_FN(tuple->Flags) = 1;
 604                                         tuple->LinkOffset += function * 5;
 605                                 }
 606                                 break;
 607                         case CISTPL_NO_LINK:
 608                                 HAS_LINK(tuple->Flags) = 0;
 609                                 break;
 610                         }
 611                         if ((tuple->Attributes & TUPLE_RETURN_LINK) &&
 612                                 (tuple->DesiredTuple == RETURN_FIRST_TUPLE))
 613                                 break;
 614                 } else
 615                         if (tuple->DesiredTuple == RETURN_FIRST_TUPLE)
 616                                 break;
 617
 618                 if (link[0] == tuple->DesiredTuple)
 619                         break;
 620                 ofs += link[1] + 2;
 621         }
 622         if (i == MAX_TUPLES) {
 623                 dev_dbg(&s->dev, "cs: overrun in pcmcia_get_next_tuple\n");
 624                 return -ENOSPC;
 625         }
 626
 627         tuple->TupleCode = link[0];
 628         tuple->TupleLink = link[1];
 629         tuple->CISOffset = ofs + 2;
 630         return 0;
 631 }
 632
 633 int pccard_get_tuple_data(struct pcmcia_socket *s, tuple_t *tuple)
 634 {
 635         u_int len;
 636         int ret;
 637
 638         if (!s)
 639                 return -EINVAL;
 640
 641         if (tuple->TupleLink < tuple->TupleOffset)
 642                 return -ENOSPC;
 643         len = tuple->TupleLink - tuple->TupleOffset;
 644         tuple->TupleDataLen = tuple->TupleLink;
 645         if (len == 0)
 646                 return 0;
 647         ret = read_cis_cache(s, SPACE(tuple->Flags),
 648                         tuple->CISOffset + tuple->TupleOffset,
 649                         min(len, (u_int) tuple->TupleDataMax),
 650                         tuple->TupleData);
 651         if (ret)
 652                 return -1;
 653         return 0;
 654 }
 655
 656
 657 /* Parsing routines for individual tuples */
 658
 659 static int parse_device(tuple_t *tuple, cistpl_device_t *device)
 660 {
 661         int i;
 662         u_char scale;
 663         u_char *p, *q;
 664
 665         p = (u_char *)tuple->TupleData;
 666         q = p + tuple->TupleDataLen;
 667
 668         device->ndev = 0;
 669         for (i = 0; i < CISTPL_MAX_DEVICES; i++) {
 670
 671                 if (*p == 0xff)
 672                         break;
 673                 device->dev[i].type = (*p >> 4);
 674                 device->dev[i].wp = (*p & 0x08) ? 1 : 0;
 675                 switch (*p & 0x07) {
 676                 case 0:
 677                         device->dev[i].speed = 0;
 678                         break;
 679                 case 1:
 680                         device->dev[i].speed = 250;
 681                         break;
 682                 case 2:
 683                         device->dev[i].speed = 200;
 684                         break;
 685                 case 3:
 686                         device->dev[i].speed = 150;
 687                         break;
 688                 case 4:
 689                         device->dev[i].speed = 100;
 690                         break;
 691                 case 7:
 692                         if (++p == q)
 693                                 return -EINVAL;
 694                         device->dev[i].speed = SPEED_CVT(*p);
 695                         while (*p & 0x80)
 696                                 if (++p == q)
 697                                         return -EINVAL;
 698                         break;
 699                 default:
 700                         return -EINVAL;
 701                 }
 702
 703                 if (++p == q)
 704                         return -EINVAL;
 705                 if (*p == 0xff)
 706                         break;
 707                 scale = *p & 7;
 708                 if (scale == 7)
 709                         return -EINVAL;
 710                 device->dev[i].size = ((*p >> 3) + 1) * (512 << (scale*2));
 711                 device->ndev++;
 712                 if (++p == q)
 713                         break;
 714         }
 715
 716         return 0;
 717 }
 718
 719
 720 static int parse_checksum(tuple_t *tuple, cistpl_checksum_t *csum)
 721 {
 722         u_char *p;
 723         if (tuple->TupleDataLen < 5)
 724                 return -EINVAL;
 725         p = (u_char *) tuple->TupleData;
 726         csum->addr = tuple->CISOffset + get_unaligned_le16(p) - 2;
 727         csum->len = get_unaligned_le16(p + 2);
 728         csum->sum = *(p + 4);
 729         return 0;
 730 }
 731
 732
 733 static int parse_longlink(tuple_t *tuple, cistpl_longlink_t *link)
 734 {
 735         if (tuple->TupleDataLen < 4)
 736                 return -EINVAL;
 737         link->addr = get_unaligned_le32(tuple->TupleData);
 738         return 0;
 739 }
 740
 741
 742 static int parse_longlink_mfc(tuple_t *tuple, cistpl_longlink_mfc_t *link)
 743 {
 744         u_char *p;
 745         int i;
 746
 747         p = (u_char *)tuple->TupleData;
 748
 749         link->nfn = *p; p++;
 750         if (tuple->TupleDataLen <= link->nfn*5)
 751                 return -EINVAL;
 752         for (i = 0; i < link->nfn; i++) {
 753                 link->fn[i].space = *p; p++;
 754                 link->fn[i].addr = get_unaligned_le32(p);
 755                 p += 4;
 756         }
 757         return 0;
 758 }
 759
 760
 761 static int parse_strings(u_char *p, u_char *q, int max,
 762                          char *s, u_char *ofs, u_char *found)
 763 {
 764         int i, j, ns;
 765
 766         if (p == q)
 767                 return -EINVAL;
 768         ns = 0; j = 0;
 769         for (i = 0; i < max; i++) {
 770                 if (*p == 0xff)
 771                         break;
 772                 ofs[i] = j;
 773                 ns++;
 774                 for (;;) {
 775                         s[j++] = (*p == 0xff) ? '\0' : *p;
 776                         if ((*p == '\0') || (*p == 0xff))
 777                                 break;
 778                         if (++p == q)
 779                                 return -EINVAL;
 780                 }
 781                 if ((*p == 0xff) || (++p == q))
 782                         break;
 783         }
 784         if (found) {
 785                 *found = ns;
 786                 return 0;
 787         }
 788
 789         return (ns == max) ? 0 : -EINVAL;
 790 }
 791
 792
 793 static int parse_vers_1(tuple_t *tuple, cistpl_vers_1_t *vers_1)
 794 {
 795         u_char *p, *q;
 796
 797         p = (u_char *)tuple->TupleData;
 798         q = p + tuple->TupleDataLen;
 799
 800         vers_1->major = *p; p++;
 801         vers_1->minor = *p; p++;
 802         if (p >= q)
 803                 return -EINVAL;
 804
 805         return parse_strings(p, q, CISTPL_VERS_1_MAX_PROD_STRINGS,
 806                         vers_1->str, vers_1->ofs, &vers_1->ns);
 807 }
 808
 809
 810 static int parse_altstr(tuple_t *tuple, cistpl_altstr_t *altstr)
 811 {
 812         u_char *p, *q;
 813
 814         p = (u_char *)tuple->TupleData;
 815         q = p + tuple->TupleDataLen;
 816
 817         return parse_strings(p, q, CISTPL_MAX_ALTSTR_STRINGS,
 818                         altstr->str, altstr->ofs, &altstr->ns);
 819 }
 820
 821
 822 static int parse_jedec(tuple_t *tuple, cistpl_jedec_t *jedec)
 823 {
 824         u_char *p, *q;
 825         int nid;
 826
 827         p = (u_char *)tuple->TupleData;
 828         q = p + tuple->TupleDataLen;
 829
 830         for (nid = 0; nid < CISTPL_MAX_DEVICES; nid++) {
 831                 if (p > q-2)
 832                         break;
 833                 jedec->id[nid].mfr = p[0];
 834                 jedec->id[nid].info = p[1];
 835                 p += 2;
 836         }
 837         jedec->nid = nid;
 838         return 0;
 839 }
 840
 841
 842 static int parse_manfid(tuple_t *tuple, cistpl_manfid_t *m)
 843 {
 844         if (tuple->TupleDataLen < 4)
 845                 return -EINVAL;
 846         m->manf = get_unaligned_le16(tuple->TupleData);
 847         m->card = get_unaligned_le16(tuple->TupleData + 2);
 848         return 0;
 849 }
 850
 851
 852 static int parse_funcid(tuple_t *tuple, cistpl_funcid_t *f)
 853 {
 854         u_char *p;
 855         if (tuple->TupleDataLen < 2)
 856                 return -EINVAL;
 857         p = (u_char *)tuple->TupleData;
 858         f->func = p[0];
 859         f->sysinit = p[1];
 860         return 0;
 861 }
 862
 863
 864 static int parse_funce(tuple_t *tuple, cistpl_funce_t *f)
 865 {
 866         u_char *p;
 867         int i;
 868         if (tuple->TupleDataLen < 1)
 869                 return -EINVAL;
 870         p = (u_char *)tuple->TupleData;
 871         f->type = p[0];
 872         for (i = 1; i < tuple->TupleDataLen; i++)
 873                 f->data[i-1] = p[i];
 874         return 0;
 875 }
 876
 877
 878 static int parse_config(tuple_t *tuple, cistpl_config_t *config)
 879 {
 880         int rasz, rmsz, i;
 881         u_char *p;
 882
 883         p = (u_char *)tuple->TupleData;
 884         rasz = *p & 0x03;
 885         rmsz = (*p & 0x3c) >> 2;
 886         if (tuple->TupleDataLen < rasz+rmsz+4)
 887                 return -EINVAL;
 888         config->last_idx = *(++p);
 889         p++;
 890         config->base = 0;
 891         for (i = 0; i <= rasz; i++)
 892                 config->base += p[i] << (8*i);
 893         p += rasz+1;
 894         for (i = 0; i < 4; i++)
 895                 config->rmask[i] = 0;
 896         for (i = 0; i <= rmsz; i++)
 897                 config->rmask[i>>2] += p[i] << (8*(i%4));
 898         config->subtuples = tuple->TupleDataLen - (rasz+rmsz+4);
 899         return 0;
 900 }
 901
 902 /* The following routines are all used to parse the nightmarish
 903  * config table entries.
 904  */
 905
 906 static u_char *parse_power(u_char *p, u_char *q, cistpl_power_t *pwr)
 907 {
 908         int i;
 909         u_int scale;
 910
 911         if (p == q)
 912                 return NULL;
 913         pwr->present = *p;
 914         pwr->flags = 0;
 915         p++;
 916         for (i = 0; i < 7; i++)
 917                 if (pwr->present & (1<<i)) {
 918                         if (p == q)
 919                                 return NULL;
 920                         pwr->param[i] = POWER_CVT(*p);
 921                         scale = POWER_SCALE(*p);
 922                         while (*p & 0x80) {
 923                                 if (++p == q)
 924                                         return NULL;
 925                                 if ((*p & 0x7f) < 100)
 926                                         pwr->param[i] +=
 927                                                 (*p & 0x7f) * scale / 100;
 928                                 else if (*p == 0x7d)
 929                                         pwr->flags |= CISTPL_POWER_HIGHZ_OK;
 930                                 else if (*p == 0x7e)
 931                                         pwr->param[i] = 0;
 932                                 else if (*p == 0x7f)
 933                                         pwr->flags |= CISTPL_POWER_HIGHZ_REQ;
 934                                 else
 935                                         return NULL;
 936                         }
 937                         p++;
 938                 }
 939         return p;
 940 }
 941
 942
 943 static u_char *parse_timing(u_char *p, u_char *q, cistpl_timing_t *timing)
 944 {
 945         u_char scale;
 946
 947         if (p == q)
 948                 return NULL;
 949         scale = *p;
 950         if ((scale & 3) != 3) {
 951                 if (++p == q)
 952                         return NULL;
 953                 timing->wait = SPEED_CVT(*p);
 954                 timing->waitscale = exponent[scale & 3];
 955         } else
 956                 timing->wait = 0;
 957         scale >>= 2;
 958         if ((scale & 7) != 7) {
 959                 if (++p == q)
 960                         return NULL;
 961                 timing->ready = SPEED_CVT(*p);
 962                 timing->rdyscale = exponent[scale & 7];
 963         } else
 964                 timing->ready = 0;
 965         scale >>= 3;
 966         if (scale != 7) {
 967                 if (++p == q)
 968                         return NULL;
 969                 timing->reserved = SPEED_CVT(*p);
 970                 timing->rsvscale = exponent[scale];
 971         } else
 972                 timing->reserved = 0;
 973         p++;
 974         return p;
 975 }
 976
 977
 978 static u_char *parse_io(u_char *p, u_char *q, cistpl_io_t *io)
 979 {
 980         int i, j, bsz, lsz;
 981
 982         if (p == q)
 983                 return NULL;
 984         io->flags = *p;
 985
 986         if (!(*p & 0x80)) {
 987                 io->nwin = 1;
 988                 io->win[0].base = 0;
 989                 io->win[0].len = (1 << (io->flags & CISTPL_IO_LINES_MASK));
 990                 return p+1;
 991         }
 992
 993         if (++p == q)
 994                 return NULL;
 995         io->nwin = (*p & 0x0f) + 1;
 996         bsz = (*p & 0x30) >> 4;
 997         if (bsz == 3)
 998                 bsz++;
 999         lsz = (*p & 0xc0) >> 6;
1000         if (lsz == 3)
1001                 lsz++;
1002         p++;
1003
1004         for (i = 0; i < io->nwin; i++) {
1005                 io->win[i].base = 0;
1006                 io->win[i].len = 1;
1007                 for (j = 0; j < bsz; j++, p++) {
1008                         if (p == q)
1009                                 return NULL;
1010                         io->win[i].base += *p << (j*8);
1011                 }
1012                 for (j = 0; j < lsz; j++, p++) {
1013                         if (p == q)
1014                                 return NULL;
1015                         io->win[i].len += *p << (j*8);
1016                 }
1017         }
1018         return p;
1019 }
1020
1021
1022 static u_char *parse_mem(u_char *p, u_char *q, cistpl_mem_t *mem)
1023 {
1024         int i, j, asz, lsz, has_ha;
1025         u_int len, ca, ha;
1026
1027         if (p == q)
1028                 return NULL;
1029
1030         mem->nwin = (*p & 0x07) + 1;
1031         lsz = (*p & 0x18) >> 3;
1032         asz = (*p & 0x60) >> 5;
1033         has_ha = (*p & 0x80);
1034         if (++p == q)
1035                 return NULL;
1036
1037         for (i = 0; i < mem->nwin; i++) {
1038                 len = ca = ha = 0;
1039                 for (j = 0; j < lsz; j++, p++) {
1040                         if (p == q)
1041                                 return NULL;
1042                         len += *p << (j*8);
1043                 }
1044                 for (j = 0; j < asz; j++, p++) {
1045                         if (p == q)
1046                                 return NULL;
1047                         ca += *p << (j*8);
1048                 }
1049                 if (has_ha)
1050                         for (j = 0; j < asz; j++, p++) {
1051                                 if (p == q)
1052                                         return NULL;
1053                                 ha += *p << (j*8);
1054                         }
1055                 mem->win[i].len = len << 8;
1056                 mem->win[i].card_addr = ca << 8;
1057                 mem->win[i].host_addr = ha << 8;
1058         }
1059         return p;
1060 }
1061
1062
1063 static u_char *parse_irq(u_char *p, u_char *q, cistpl_irq_t *irq)
1064 {
1065         if (p == q)
1066                 return NULL;
1067         irq->IRQInfo1 = *p; p++;
1068         if (irq->IRQInfo1 & IRQ_INFO2_VALID) {
1069                 if (p+2 > q)
1070                         return NULL;
1071                 irq->IRQInfo2 = (p[1]<<8) + p[0];
1072                 p += 2;
1073         }
1074         return p;
1075 }
1076
1077
1078 static int parse_cftable_entry(tuple_t *tuple,
1079                                cistpl_cftable_entry_t *entry)
1080 {
1081         u_char *p, *q, features;
1082
1083         p = tuple->TupleData;
1084         q = p + tuple->TupleDataLen;
1085         entry->index = *p & 0x3f;
1086         entry->flags = 0;
1087         if (*p & 0x40)
1088                 entry->flags |= CISTPL_CFTABLE_DEFAULT;
1089         if (*p & 0x80) {
1090                 if (++p == q)
1091                         return -EINVAL;
1092                 if (*p & 0x10)
1093                         entry->flags |= CISTPL_CFTABLE_BVDS;
1094                 if (*p & 0x20)
1095                         entry->flags |= CISTPL_CFTABLE_WP;
1096                 if (*p & 0x40)
1097                         entry->flags |= CISTPL_CFTABLE_RDYBSY;
1098                 if (*p & 0x80)
1099                         entry->flags |= CISTPL_CFTABLE_MWAIT;
1100                 entry->interface = *p & 0x0f;
1101         } else
1102                 entry->interface = 0;
1103
1104         /* Process optional features */
1105         if (++p == q)
1106                 return -EINVAL;
1107         features = *p; p++;
1108
1109         /* Power options */
1110         if ((features & 3) > 0) {
1111                 p = parse_power(p, q, &entry->vcc);
1112                 if (p == NULL)
1113                         return -EINVAL;
1114         } else
1115                 entry->vcc.present = 0;
1116         if ((features & 3) > 1) {
1117                 p = parse_power(p, q, &entry->vpp1);
1118                 if (p == NULL)
1119                         return -EINVAL;
1120         } else
1121                 entry->vpp1.present = 0;
1122         if ((features & 3) > 2) {
1123                 p = parse_power(p, q, &entry->vpp2);
1124                 if (p == NULL)
1125                         return -EINVAL;
1126         } else
1127                 entry->vpp2.present = 0;
1128
1129         /* Timing options */
1130         if (features & 0x04) {
1131                 p = parse_timing(p, q, &entry->timing);
1132                 if (p == NULL)
1133                         return -EINVAL;
1134         } else {
1135                 entry->timing.wait = 0;
1136                 entry->timing.ready = 0;
1137                 entry->timing.reserved = 0;
1138         }
1139
1140         /* I/O window options */
1141         if (features & 0x08) {
1142                 p = parse_io(p, q, &entry->io);
1143                 if (p == NULL)
1144                         return -EINVAL;
1145         } else
1146                 entry->io.nwin = 0;
1147
1148         /* Interrupt options */
1149         if (features & 0x10) {
1150                 p = parse_irq(p, q, &entry->irq);
1151                 if (p == NULL)
1152                         return -EINVAL;
1153         } else
1154                 entry->irq.IRQInfo1 = 0;
1155
1156         switch (features & 0x60) {
1157         case 0x00:
1158                 entry->mem.nwin = 0;
1159                 break;
1160         case 0x20:
1161                 entry->mem.nwin = 1;
1162                 entry->mem.win[0].len = get_unaligned_le16(p) << 8;
1163                 entry->mem.win[0].card_addr = 0;
1164                 entry->mem.win[0].host_addr = 0;
1165                 p += 2;
1166                 if (p > q)
1167                         return -EINVAL;
1168                 break;
1169         case 0x40:
1170                 entry->mem.nwin = 1;
1171                 entry->mem.win[0].len = get_unaligned_le16(p) << 8;
1172                 entry->mem.win[0].card_addr = get_unaligned_le16(p + 2) << 8;
1173                 entry->mem.win[0].host_addr = 0;
1174                 p += 4;
1175                 if (p > q)
1176                         return -EINVAL;
1177                 break;
1178         case 0x60:
1179                 p = parse_mem(p, q, &entry->mem);
1180                 if (p == NULL)
1181                         return -EINVAL;
1182                 break;
1183         }
1184
1185         /* Misc features */
1186         if (features & 0x80) {
1187                 if (p == q)
1188                         return -EINVAL;
1189                 entry->flags |= (*p << 8);
1190                 while (*p & 0x80)
1191                         if (++p == q)
1192                                 return -EINVAL;
1193                 p++;
1194         }
1195
1196         entry->subtuples = q-p;
1197
1198         return 0;
1199 }
1200
1201
1202 static int parse_device_geo(tuple_t *tuple, cistpl_device_geo_t *geo)
1203 {
1204         u_char *p, *q;
1205         int n;
1206
1207         p = (u_char *)tuple->TupleData;
1208         q = p + tuple->TupleDataLen;
1209
1210         for (n = 0; n < CISTPL_MAX_DEVICES; n++) {
1211                 if (p > q-6)
1212                         break;
1213                 geo->geo[n].buswidth = p[0];
1214                 geo->geo[n].erase_block = 1 << (p[1]-1);
1215                 geo->geo[n].read_block  = 1 << (p[2]-1);
1216                 geo->geo[n].write_block = 1 << (p[3]-1);
1217                 geo->geo[n].partition   = 1 << (p[4]-1);
1218                 geo->geo[n].interleave  = 1 << (p[5]-1);
1219                 p += 6;
1220         }
1221         geo->ngeo = n;
1222         return 0;
1223 }
1224
1225
1226 static int parse_vers_2(tuple_t *tuple, cistpl_vers_2_t *v2)
1227 {
1228         u_char *p, *q;
1229
1230         if (tuple->TupleDataLen < 10)
1231                 return -EINVAL;
1232
1233         p = tuple->TupleData;
1234         q = p + tuple->TupleDataLen;
1235
1236         v2->vers = p[0];
1237         v2->comply = p[1];
1238         v2->dindex = get_unaligned_le16(p + 2);
1239         v2->vspec8 = p[6];
1240         v2->vspec9 = p[7];
1241         v2->nhdr = p[8];
1242         p += 9;
1243         return parse_strings(p, q, 2, v2->str, &v2->vendor, NULL);
1244 }
1245
1246
1247 static int parse_org(tuple_t *tuple, cistpl_org_t *org)
1248 {
1249         u_char *p, *q;
1250         int i;
1251
1252         p = tuple->TupleData;
1253         q = p + tuple->TupleDataLen;
1254         if (p == q)
1255                 return -EINVAL;
1256         org->data_org = *p;
1257         if (++p == q)
1258                 return -EINVAL;
1259         for (i = 0; i < 30; i++) {
1260                 org->desc[i] = *p;
1261                 if (*p == '\0')
1262                         break;
1263                 if (++p == q)
1264                         return -EINVAL;
1265         }
1266         return 0;
1267 }
1268
1269
1270 static int parse_format(tuple_t *tuple, cistpl_format_t *fmt)
1271 {
1272         u_char *p;
1273
1274         if (tuple->TupleDataLen < 10)
1275                 return -EINVAL;
1276
1277         p = tuple->TupleData;
1278
1279         fmt->type = p[0];
1280         fmt->edc = p[1];
1281         fmt->offset = get_unaligned_le32(p + 2);
1282         fmt->length = get_unaligned_le32(p + 6);
1283
1284         return 0;
1285 }
1286
1287
1288 int pcmcia_parse_tuple(tuple_t *tuple, cisparse_t *parse)
1289 {
1290         int ret = 0;
1291
1292         if (tuple->TupleDataLen > tuple->TupleDataMax)
1293                 return -EINVAL;
1294         switch (tuple->TupleCode) {
1295         case CISTPL_DEVICE:
1296         case CISTPL_DEVICE_A:
1297                 ret = parse_device(tuple, &parse->device);
1298                 break;
1299         case CISTPL_CHECKSUM:
1300                 ret = parse_checksum(tuple, &parse->checksum);
1301                 break;
1302         case CISTPL_LONGLINK_A:
1303         case CISTPL_LONGLINK_C:
1304                 ret = parse_longlink(tuple, &parse->longlink);
1305                 break;
1306         case CISTPL_LONGLINK_MFC:
1307                 ret = parse_longlink_mfc(tuple, &parse->longlink_mfc);
1308                 break;
1309         case CISTPL_VERS_1:
1310                 ret = parse_vers_1(tuple, &parse->version_1);
1311                 break;
1312         case CISTPL_ALTSTR:
1313                 ret = parse_altstr(tuple, &parse->altstr);
1314                 break;
1315         case CISTPL_JEDEC_A:
1316         case CISTPL_JEDEC_C:
1317                 ret = parse_jedec(tuple, &parse->jedec);
1318                 break;
1319         case CISTPL_MANFID:
1320                 ret = parse_manfid(tuple, &parse->manfid);
1321                 break;
1322         case CISTPL_FUNCID:
1323                 ret = parse_funcid(tuple, &parse->funcid);
1324                 break;
1325         case CISTPL_FUNCE:
1326                 ret = parse_funce(tuple, &parse->funce);
1327                 break;
1328         case CISTPL_CONFIG:
1329                 ret = parse_config(tuple, &parse->config);
1330                 break;
1331         case CISTPL_CFTABLE_ENTRY:
1332                 ret = parse_cftable_entry(tuple, &parse->cftable_entry);
1333                 break;
1334         case CISTPL_DEVICE_GEO:
1335         case CISTPL_DEVICE_GEO_A:
1336                 ret = parse_device_geo(tuple, &parse->device_geo);
1337                 break;
1338         case CISTPL_VERS_2:
1339                 ret = parse_vers_2(tuple, &parse->vers_2);
1340                 break;
1341         case CISTPL_ORG:
1342                 ret = parse_org(tuple, &parse->org);
1343                 break;
1344         case CISTPL_FORMAT:
1345         case CISTPL_FORMAT_A:
1346                 ret = parse_format(tuple, &parse->format);
1347                 break;
1348         case CISTPL_NO_LINK:
1349         case CISTPL_LINKTARGET:
1350                 ret = 0;
1351                 break;
1352         default:
1353                 ret = -EINVAL;
1354                 break;
1355         }
1356         if (ret)
1357                 pr_debug("parse_tuple failed %d\n", ret);
1358         return ret;
1359 }
1360 EXPORT_SYMBOL(pcmcia_parse_tuple);
1361
1362
1363 /**
1364  * pccard_validate_cis() - check whether card has a sensible CIS
1365  * @s:          the struct pcmcia_socket we are to check
1366  * @info:       returns the number of tuples in the (valid) CIS, or 0
1367  *
1368  * This tries to determine if a card has a sensible CIS.  In @info, it
1369  * returns the number of tuples in the CIS, or 0 if the CIS looks bad. The
1370  * checks include making sure several critical tuples are present and
1371  * valid; seeing if the total number of tuples is reasonable; and
1372  * looking for tuples that use reserved codes.
1373  *
1374  * The function returns 0 on success.
1375  */
1376 int pccard_validate_cis(struct pcmcia_socket *s, unsigned int *info)
1377 {
1378         tuple_t *tuple;
1379         cisparse_t *p;
1380         unsigned int count = 0;
1381         int ret, reserved, dev_ok = 0, ident_ok = 0;
1382
1383         if (!s)
1384                 return -EINVAL;
1385
1386         if (s->functions || !(s->state & SOCKET_PRESENT)) {
1387                 WARN_ON(1);
1388                 return -EINVAL;
1389         }
1390
1391         /* We do not want to validate the CIS cache... */
1392         mutex_lock(&s->ops_mutex);
1393         destroy_cis_cache(s);
1394         mutex_unlock(&s->ops_mutex);
1395
1396         tuple = kmalloc(sizeof(*tuple), GFP_KERNEL);
1397         if (tuple == NULL) {
1398                 dev_warn(&s->dev, "no memory to validate CIS\n");
1399                 return -ENOMEM;
1400         }
1401         p = kmalloc(sizeof(*p), GFP_KERNEL);
1402         if (p == NULL) {
1403                 kfree(tuple);
1404                 dev_warn(&s->dev, "no memory to validate CIS\n");
1405                 return -ENOMEM;
1406         }
1407
1408         count = reserved = 0;
1409         tuple->DesiredTuple = RETURN_FIRST_TUPLE;
1410         tuple->Attributes = TUPLE_RETURN_COMMON;
1411         ret = pccard_get_first_tuple(s, BIND_FN_ALL, tuple);
1412         if (ret != 0)
1413                 goto done;
1414
1415         /* First tuple should be DEVICE; we should really have either that
1416            or a CFTABLE_ENTRY of some sort */
1417         if ((tuple->TupleCode == CISTPL_DEVICE) ||
1418             (!pccard_read_tuple(s, BIND_FN_ALL, CISTPL_CFTABLE_ENTRY, p)) ||
1419             (!pccard_read_tuple(s, BIND_FN_ALL, CISTPL_CFTABLE_ENTRY_CB, p)))
1420                 dev_ok++;
1421
1422         /* All cards should have a MANFID tuple, and/or a VERS_1 or VERS_2
1423            tuple, for card identification.  Certain old D-Link and Linksys
1424            cards have only a broken VERS_2 tuple; hence the bogus test. */
1425         if ((pccard_read_tuple(s, BIND_FN_ALL, CISTPL_MANFID, p) == 0) ||
1426             (pccard_read_tuple(s, BIND_FN_ALL, CISTPL_VERS_1, p) == 0) ||
1427             (pccard_read_tuple(s, BIND_FN_ALL, CISTPL_VERS_2, p) != -ENOSPC))
1428                 ident_ok++;
1429
1430         if (!dev_ok && !ident_ok)
1431                 goto done;
1432
1433         for (count = 1; count < MAX_TUPLES; count++) {
1434                 ret = pccard_get_next_tuple(s, BIND_FN_ALL, tuple);
1435                 if (ret != 0)
1436                         break;
1437                 if (((tuple->TupleCode > 0x23) && (tuple->TupleCode < 0x40)) ||
1438                     ((tuple->TupleCode > 0x47) && (tuple->TupleCode < 0x80)) ||
1439                     ((tuple->TupleCode > 0x90) && (tuple->TupleCode < 0xff)))
1440                         reserved++;
1441         }
1442         if ((count == MAX_TUPLES) || (reserved > 5) ||
1443                 ((!dev_ok || !ident_ok) && (count > 10)))
1444                 count = 0;
1445
1446         ret = 0;
1447
1448 done:
1449         /* invalidate CIS cache on failure */
1450         if (!dev_ok || !ident_ok || !count) {
1451                 mutex_lock(&s->ops_mutex);
1452                 destroy_cis_cache(s);
1453                 mutex_unlock(&s->ops_mutex);
1454                 /* We differentiate between dev_ok, ident_ok and count
1455                    failures to allow for an override for anonymous cards
1456                    in ds.c */
1457                 if (!dev_ok || !ident_ok)
1458                         ret = -EIO;
1459                 else
1460                         ret = -EFAULT;
1461         }
1462
1463         if (info)
1464                 *info = count;
1465         kfree(tuple);
1466         kfree(p);
1467         return ret;
1468 }
1469
1470
1471 #define to_socket(_dev) container_of(_dev, struct pcmcia_socket, dev)
1472
1473 static ssize_t pccard_extract_cis(struct pcmcia_socket *s, char *buf,
1474                                   loff_t off, size_t count)
1475 {
1476         tuple_t tuple;
1477         int status, i;
1478         loff_t pointer = 0;
1479         ssize_t ret = 0;
1480         u_char *tuplebuffer;
1481         u_char *tempbuffer;
1482
1483         tuplebuffer = kmalloc_array(256, sizeof(u_char), GFP_KERNEL);
1484         if (!tuplebuffer)
1485                 return -ENOMEM;
1486
1487         tempbuffer = kmalloc_array(258, sizeof(u_char), GFP_KERNEL);
1488         if (!tempbuffer) {
1489                 ret = -ENOMEM;
1490                 goto free_tuple;
1491         }
1492
1493         memset(&tuple, 0, sizeof(tuple_t));
1494
1495         tuple.Attributes = TUPLE_RETURN_LINK | TUPLE_RETURN_COMMON;
1496         tuple.DesiredTuple = RETURN_FIRST_TUPLE;
1497         tuple.TupleOffset = 0;
1498
1499         status = pccard_get_first_tuple(s, BIND_FN_ALL, &tuple);
1500         while (!status) {
1501                 tuple.TupleData = tuplebuffer;
1502                 tuple.TupleDataMax = 255;
1503                 memset(tuplebuffer, 0, sizeof(u_char) * 255);
1504
1505                 status = pccard_get_tuple_data(s, &tuple);
1506                 if (status)
1507                         break;
1508
1509                 if (off < (pointer + 2 + tuple.TupleDataLen)) {
1510                         tempbuffer[0] = tuple.TupleCode & 0xff;
1511                         tempbuffer[1] = tuple.TupleLink & 0xff;
1512                         for (i = 0; i < tuple.TupleDataLen; i++)
1513                                 tempbuffer[i + 2] = tuplebuffer[i] & 0xff;
1514
1515                         for (i = 0; i < (2 + tuple.TupleDataLen); i++) {
1516                                 if (((i + pointer) >= off) &&
1517                                     (i + pointer) < (off + count)) {
1518                                         buf[ret] = tempbuffer[i];
1519                                         ret++;
1520                                 }
1521                         }
1522                 }
1523
1524                 pointer += 2 + tuple.TupleDataLen;
1525
1526                 if (pointer >= (off + count))
1527                         break;
1528
1529                 if (tuple.TupleCode == CISTPL_END)
1530                         break;
1531                 status = pccard_get_next_tuple(s, BIND_FN_ALL, &tuple);
1532         }
1533
1534         kfree(tempbuffer);
1535  free_tuple:
1536         kfree(tuplebuffer);
1537
1538         return ret;
1539 }
1540
1541
1542 static ssize_t pccard_show_cis(struct file *filp, struct kobject *kobj,
1543                                struct bin_attribute *bin_attr,
1544                                char *buf, loff_t off, size_t count)
1545 {
1546         unsigned int size = 0x200;
1547
1548         if (off >= size)
1549                 count = 0;
1550         else {
1551                 struct pcmcia_socket *s;
1552                 unsigned int chains = 1;
1553
1554                 if (off + count > size)
1555                         count = size - off;
1556
1557                 s = to_socket(container_of(kobj, struct device, kobj));
1558
1559                 if (!(s->state & SOCKET_PRESENT))
1560                         return -ENODEV;
1561                 if (!s->functions && pccard_validate_cis(s, &chains))
1562                         return -EIO;
1563                 if (!chains)
1564                         return -ENODATA;
1565
1566                 count = pccard_extract_cis(s, buf, off, count);
1567         }
1568
1569         return count;
1570 }
1571
1572
1573 static ssize_t pccard_store_cis(struct file *filp, struct kobject *kobj,
1574                                 struct bin_attribute *bin_attr,
1575                                 char *buf, loff_t off, size_t count)
1576 {
1577         struct pcmcia_socket *s;
1578         int error;
1579
1580         error = security_locked_down(LOCKDOWN_PCMCIA_CIS);
1581         if (error)
1582                 return error;
1583
1584         s = to_socket(container_of(kobj, struct device, kobj));
1585
1586         if (off)
1587                 return -EINVAL;
1588
1589         if (count >= CISTPL_MAX_CIS_SIZE)
1590                 return -EINVAL;
1591
1592         if (!(s->state & SOCKET_PRESENT))
1593                 return -ENODEV;
1594
1595         error = pcmcia_replace_cis(s, buf, count);
1596         if (error)
1597                 return -EIO;
1598
1599         pcmcia_parse_uevents(s, PCMCIA_UEVENT_REQUERY);
1600
1601         return count;
1602 }
1603
1604
1605 const struct bin_attribute pccard_cis_attr = {
1606         .attr = { .name = "cis", .mode = S_IRUGO | S_IWUSR },
1607         .size = 0x200,
1608         .read = pccard_show_cis,
1609         .write = pccard_store_cis,
1610 };