linux/drivers/pcmcia/cistpl.c
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   1/*
   2 * cistpl.c -- 16-bit PCMCIA Card Information Structure parser
   3 *
   4 * This program is free software; you can redistribute it and/or modify
   5 * it under the terms of the GNU General Public License version 2 as
   6 * published by the Free Software Foundation.
   7 *
   8 * The initial developer of the original code is David A. Hinds
   9 * <dahinds@users.sourceforge.net>.  Portions created by David A. Hinds
  10 * are Copyright (C) 1999 David A. Hinds.  All Rights Reserved.
  11 *
  12 * (C) 1999             David A. Hinds
  13 */
  14
  15#include <linux/module.h>
  16#include <linux/moduleparam.h>
  17#include <linux/kernel.h>
  18#include <linux/string.h>
  19#include <linux/major.h>
  20#include <linux/errno.h>
  21#include <linux/timer.h>
  22#include <linux/slab.h>
  23#include <linux/mm.h>
  24#include <linux/pci.h>
  25#include <linux/ioport.h>
  26#include <linux/io.h>
  27#include <asm/byteorder.h>
  28#include <asm/unaligned.h>
  29
  30#include <pcmcia/ss.h>
  31#include <pcmcia/cisreg.h>
  32#include <pcmcia/cistpl.h>
  33#include "cs_internal.h"
  34
  35static const u_char mantissa[] = {
  36    10, 12, 13, 15, 20, 25, 30, 35,
  37    40, 45, 50, 55, 60, 70, 80, 90
  38};
  39
  40static const u_int exponent[] = {
  41    1, 10, 100, 1000, 10000, 100000, 1000000, 10000000
  42};
  43
  44/* Convert an extended speed byte to a time in nanoseconds */
  45#define SPEED_CVT(v) \
  46    (mantissa[(((v)>>3)&15)-1] * exponent[(v)&7] / 10)
  47/* Convert a power byte to a current in 0.1 microamps */
  48#define POWER_CVT(v) \
  49    (mantissa[((v)>>3)&15] * exponent[(v)&7] / 10)
  50#define POWER_SCALE(v)          (exponent[(v)&7])
  51
  52/* Upper limit on reasonable # of tuples */
  53#define MAX_TUPLES              200
  54
  55/* Bits in IRQInfo1 field */
  56#define IRQ_INFO2_VALID         0x10
  57
  58/* 16-bit CIS? */
  59static int cis_width;
  60module_param(cis_width, int, 0444);
  61
  62void release_cis_mem(struct pcmcia_socket *s)
  63{
  64        mutex_lock(&s->ops_mutex);
  65        if (s->cis_mem.flags & MAP_ACTIVE) {
  66                s->cis_mem.flags &= ~MAP_ACTIVE;
  67                s->ops->set_mem_map(s, &s->cis_mem);
  68                if (s->cis_mem.res) {
  69                        release_resource(s->cis_mem.res);
  70                        kfree(s->cis_mem.res);
  71                        s->cis_mem.res = NULL;
  72                }
  73                iounmap(s->cis_virt);
  74                s->cis_virt = NULL;
  75        }
  76        mutex_unlock(&s->ops_mutex);
  77}
  78
  79/**
  80 * set_cis_map() - map the card memory at "card_offset" into virtual space.
  81 *
  82 * If flags & MAP_ATTRIB, map the attribute space, otherwise
  83 * map the memory space.
  84 *
  85 * Must be called with ops_mutex held.
  86 */
  87static void __iomem *set_cis_map(struct pcmcia_socket *s,
  88                                unsigned int card_offset, unsigned int flags)
  89{
  90        pccard_mem_map *mem = &s->cis_mem;
  91        int ret;
  92
  93        if (!(s->features & SS_CAP_STATIC_MAP) && (mem->res == NULL)) {
  94                mem->res = pcmcia_find_mem_region(0, s->map_size,
  95                                                s->map_size, 0, s);
  96                if (mem->res == NULL) {
  97                        dev_printk(KERN_NOTICE, &s->dev,
  98                                   "cs: unable to map card memory!\n");
  99                        return NULL;
 100                }
 101                s->cis_virt = NULL;
 102        }
 103
 104        if (!(s->features & SS_CAP_STATIC_MAP) && (!s->cis_virt))
 105                s->cis_virt = ioremap(mem->res->start, s->map_size);
 106
 107        mem->card_start = card_offset;
 108        mem->flags = flags;
 109
 110        ret = s->ops->set_mem_map(s, mem);
 111        if (ret) {
 112                iounmap(s->cis_virt);
 113                s->cis_virt = NULL;
 114                return NULL;
 115        }
 116
 117        if (s->features & SS_CAP_STATIC_MAP) {
 118                if (s->cis_virt)
 119                        iounmap(s->cis_virt);
 120                s->cis_virt = ioremap(mem->static_start, s->map_size);
 121        }
 122
 123        return s->cis_virt;
 124}
 125
 126
 127/* Bits in attr field */
 128#define IS_ATTR         1
 129#define IS_INDIRECT     8
 130
 131/**
 132 * pcmcia_read_cis_mem() - low-level function to read CIS memory
 133 *
 134 * must be called with ops_mutex held
 135 */
 136int pcmcia_read_cis_mem(struct pcmcia_socket *s, int attr, u_int addr,
 137                 u_int len, void *ptr)
 138{
 139        void __iomem *sys, *end;
 140        unsigned char *buf = ptr;
 141
 142        dev_dbg(&s->dev, "pcmcia_read_cis_mem(%d, %#x, %u)\n", attr, addr, len);
 143
 144        if (attr & IS_INDIRECT) {
 145                /* Indirect accesses use a bunch of special registers at fixed
 146                   locations in common memory */
 147                u_char flags = ICTRL0_COMMON|ICTRL0_AUTOINC|ICTRL0_BYTEGRAN;
 148                if (attr & IS_ATTR) {
 149                        addr *= 2;
 150                        flags = ICTRL0_AUTOINC;
 151                }
 152
 153                sys = set_cis_map(s, 0, MAP_ACTIVE |
 154                                ((cis_width) ? MAP_16BIT : 0));
 155                if (!sys) {
 156                        dev_dbg(&s->dev, "could not map memory\n");
 157                        memset(ptr, 0xff, len);
 158                        return -1;
 159                }
 160
 161                writeb(flags, sys+CISREG_ICTRL0);
 162                writeb(addr & 0xff, sys+CISREG_IADDR0);
 163                writeb((addr>>8) & 0xff, sys+CISREG_IADDR1);
 164                writeb((addr>>16) & 0xff, sys+CISREG_IADDR2);
 165                writeb((addr>>24) & 0xff, sys+CISREG_IADDR3);
 166                for ( ; len > 0; len--, buf++)
 167                        *buf = readb(sys+CISREG_IDATA0);
 168        } else {
 169                u_int inc = 1, card_offset, flags;
 170
 171                if (addr > CISTPL_MAX_CIS_SIZE)
 172                        dev_dbg(&s->dev,
 173                                "attempt to read CIS mem at addr %#x", addr);
 174
 175                flags = MAP_ACTIVE | ((cis_width) ? MAP_16BIT : 0);
 176                if (attr) {
 177                        flags |= MAP_ATTRIB;
 178                        inc++;
 179                        addr *= 2;
 180                }
 181
 182                card_offset = addr & ~(s->map_size-1);
 183                while (len) {
 184                        sys = set_cis_map(s, card_offset, flags);
 185                        if (!sys) {
 186                                dev_dbg(&s->dev, "could not map memory\n");
 187                                memset(ptr, 0xff, len);
 188                                return -1;
 189                        }
 190                        end = sys + s->map_size;
 191                        sys = sys + (addr & (s->map_size-1));
 192                        for ( ; len > 0; len--, buf++, sys += inc) {
 193                                if (sys == end)
 194                                        break;
 195                                *buf = readb(sys);
 196                        }
 197                        card_offset += s->map_size;
 198                        addr = 0;
 199                }
 200        }
 201        dev_dbg(&s->dev, "  %#2.2x %#2.2x %#2.2x %#2.2x ...\n",
 202                *(u_char *)(ptr+0), *(u_char *)(ptr+1),
 203                *(u_char *)(ptr+2), *(u_char *)(ptr+3));
 204        return 0;
 205}
 206
 207
 208/**
 209 * pcmcia_write_cis_mem() - low-level function to write CIS memory
 210 *
 211 * Probably only useful for writing one-byte registers. Must be called
 212 * with ops_mutex held.
 213 */
 214int pcmcia_write_cis_mem(struct pcmcia_socket *s, int attr, u_int addr,
 215                   u_int len, void *ptr)
 216{
 217        void __iomem *sys, *end;
 218        unsigned char *buf = ptr;
 219
 220        dev_dbg(&s->dev,
 221                "pcmcia_write_cis_mem(%d, %#x, %u)\n", attr, addr, len);
 222
 223        if (attr & IS_INDIRECT) {
 224                /* Indirect accesses use a bunch of special registers at fixed
 225                   locations in common memory */
 226                u_char flags = ICTRL0_COMMON|ICTRL0_AUTOINC|ICTRL0_BYTEGRAN;
 227                if (attr & IS_ATTR) {
 228                        addr *= 2;
 229                        flags = ICTRL0_AUTOINC;
 230                }
 231
 232                sys = set_cis_map(s, 0, MAP_ACTIVE |
 233                                ((cis_width) ? MAP_16BIT : 0));
 234                if (!sys) {
 235                        dev_dbg(&s->dev, "could not map memory\n");
 236                        return -EINVAL;
 237                }
 238
 239                writeb(flags, sys+CISREG_ICTRL0);
 240                writeb(addr & 0xff, sys+CISREG_IADDR0);
 241                writeb((addr>>8) & 0xff, sys+CISREG_IADDR1);
 242                writeb((addr>>16) & 0xff, sys+CISREG_IADDR2);
 243                writeb((addr>>24) & 0xff, sys+CISREG_IADDR3);
 244                for ( ; len > 0; len--, buf++)
 245                        writeb(*buf, sys+CISREG_IDATA0);
 246        } else {
 247                u_int inc = 1, card_offset, flags;
 248
 249                flags = MAP_ACTIVE | ((cis_width) ? MAP_16BIT : 0);
 250                if (attr & IS_ATTR) {
 251                        flags |= MAP_ATTRIB;
 252                        inc++;
 253                        addr *= 2;
 254                }
 255
 256                card_offset = addr & ~(s->map_size-1);
 257                while (len) {
 258                        sys = set_cis_map(s, card_offset, flags);
 259                        if (!sys) {
 260                                dev_dbg(&s->dev, "could not map memory\n");
 261                                return -EINVAL;
 262                        }
 263
 264                        end = sys + s->map_size;
 265                        sys = sys + (addr & (s->map_size-1));
 266                        for ( ; len > 0; len--, buf++, sys += inc) {
 267                                if (sys == end)
 268                                        break;
 269                                writeb(*buf, sys);
 270                        }
 271                        card_offset += s->map_size;
 272                        addr = 0;
 273                }
 274        }
 275        return 0;
 276}
 277
 278
 279/**
 280 * read_cis_cache() - read CIS memory or its associated cache
 281 *
 282 * This is a wrapper around read_cis_mem, with the same interface,
 283 * but which caches information, for cards whose CIS may not be
 284 * readable all the time.
 285 */
 286static int read_cis_cache(struct pcmcia_socket *s, int attr, u_int addr,
 287                        size_t len, void *ptr)
 288{
 289        struct cis_cache_entry *cis;
 290        int ret = 0;
 291
 292        if (s->state & SOCKET_CARDBUS)
 293                return -EINVAL;
 294
 295        mutex_lock(&s->ops_mutex);
 296        if (s->fake_cis) {
 297                if (s->fake_cis_len >= addr+len)
 298                        memcpy(ptr, s->fake_cis+addr, len);
 299                else {
 300                        memset(ptr, 0xff, len);
 301                        ret = -EINVAL;
 302                }
 303                mutex_unlock(&s->ops_mutex);
 304                return ret;
 305        }
 306
 307        list_for_each_entry(cis, &s->cis_cache, node) {
 308                if (cis->addr == addr && cis->len == len && cis->attr == attr) {
 309                        memcpy(ptr, cis->cache, len);
 310                        mutex_unlock(&s->ops_mutex);
 311                        return 0;
 312                }
 313        }
 314
 315        ret = pcmcia_read_cis_mem(s, attr, addr, len, ptr);
 316
 317        if (ret == 0) {
 318                /* Copy data into the cache */
 319                cis = kmalloc(sizeof(struct cis_cache_entry) + len, GFP_KERNEL);
 320                if (cis) {
 321                        cis->addr = addr;
 322                        cis->len = len;
 323                        cis->attr = attr;
 324                        memcpy(cis->cache, ptr, len);
 325                        list_add(&cis->node, &s->cis_cache);
 326                }
 327        }
 328        mutex_unlock(&s->ops_mutex);
 329
 330        return ret;
 331}
 332
 333static void
 334remove_cis_cache(struct pcmcia_socket *s, int attr, u_int addr, u_int len)
 335{
 336        struct cis_cache_entry *cis;
 337
 338        mutex_lock(&s->ops_mutex);
 339        list_for_each_entry(cis, &s->cis_cache, node)
 340                if (cis->addr == addr && cis->len == len && cis->attr == attr) {
 341                        list_del(&cis->node);
 342                        kfree(cis);
 343                        break;
 344                }
 345        mutex_unlock(&s->ops_mutex);
 346}
 347
 348/**
 349 * destroy_cis_cache() - destroy the CIS cache
 350 * @s:          pcmcia_socket for which CIS cache shall be destroyed
 351 *
 352 * This destroys the CIS cache but keeps any fake CIS alive. Must be
 353 * called with ops_mutex held.
 354 */
 355void destroy_cis_cache(struct pcmcia_socket *s)
 356{
 357        struct list_head *l, *n;
 358        struct cis_cache_entry *cis;
 359
 360        list_for_each_safe(l, n, &s->cis_cache) {
 361                cis = list_entry(l, struct cis_cache_entry, node);
 362                list_del(&cis->node);
 363                kfree(cis);
 364        }
 365}
 366
 367/**
 368 * verify_cis_cache() - does the CIS match what is in the CIS cache?
 369 */
 370int verify_cis_cache(struct pcmcia_socket *s)
 371{
 372        struct cis_cache_entry *cis;
 373        char *buf;
 374        int ret;
 375
 376        if (s->state & SOCKET_CARDBUS)
 377                return -EINVAL;
 378
 379        buf = kmalloc(256, GFP_KERNEL);
 380        if (buf == NULL) {
 381                dev_printk(KERN_WARNING, &s->dev,
 382                           "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 */
 410int 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_printk(KERN_WARNING, &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_printk(KERN_WARNING, &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
 434typedef 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} tuple_flags;
 440
 441#define LINK_SPACE(f)   (((tuple_flags *)(&(f)))->link_space)
 442#define HAS_LINK(f)     (((tuple_flags *)(&(f)))->has_link)
 443#define MFC_FN(f)       (((tuple_flags *)(&(f)))->mfc_fn)
 444#define SPACE(f)        (((tuple_flags *)(&(f)))->space)
 445
 446int 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
 474static 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
 521int 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
 633int 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
 659static 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
 720static 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
 733static 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
 742static 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
 761static 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
 793static 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
 810static 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
 822static 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
 842static 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
 852static 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
 864static 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
 878static 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
 906static 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
 943static 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
 978static 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
1022static 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
1063static 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
1078static 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
1202static 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
1226static 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
1247static 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
1270static 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
1288int 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}
1360EXPORT_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 */
1376int 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) {
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
1448done:
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                ret = -EIO;
1455        }
1456
1457        if (info)
1458                *info = count;
1459        kfree(tuple);
1460        kfree(p);
1461        return ret;
1462}
1463
1464
1465#define to_socket(_dev) container_of(_dev, struct pcmcia_socket, dev)
1466
1467static ssize_t pccard_extract_cis(struct pcmcia_socket *s, char *buf,
1468                                  loff_t off, size_t count)
1469{
1470        tuple_t tuple;
1471        int status, i;
1472        loff_t pointer = 0;
1473        ssize_t ret = 0;
1474        u_char *tuplebuffer;
1475        u_char *tempbuffer;
1476
1477        tuplebuffer = kmalloc(sizeof(u_char) * 256, GFP_KERNEL);
1478        if (!tuplebuffer)
1479                return -ENOMEM;
1480
1481        tempbuffer = kmalloc(sizeof(u_char) * 258, GFP_KERNEL);
1482        if (!tempbuffer) {
1483                ret = -ENOMEM;
1484                goto free_tuple;
1485        }
1486
1487        memset(&tuple, 0, sizeof(tuple_t));
1488
1489        tuple.Attributes = TUPLE_RETURN_LINK | TUPLE_RETURN_COMMON;
1490        tuple.DesiredTuple = RETURN_FIRST_TUPLE;
1491        tuple.TupleOffset = 0;
1492
1493        status = pccard_get_first_tuple(s, BIND_FN_ALL, &tuple);
1494        while (!status) {
1495                tuple.TupleData = tuplebuffer;
1496                tuple.TupleDataMax = 255;
1497                memset(tuplebuffer, 0, sizeof(u_char) * 255);
1498
1499                status = pccard_get_tuple_data(s, &tuple);
1500                if (status)
1501                        break;
1502
1503                if (off < (pointer + 2 + tuple.TupleDataLen)) {
1504                        tempbuffer[0] = tuple.TupleCode & 0xff;
1505                        tempbuffer[1] = tuple.TupleLink & 0xff;
1506                        for (i = 0; i < tuple.TupleDataLen; i++)
1507                                tempbuffer[i + 2] = tuplebuffer[i] & 0xff;
1508
1509                        for (i = 0; i < (2 + tuple.TupleDataLen); i++) {
1510                                if (((i + pointer) >= off) &&
1511                                    (i + pointer) < (off + count)) {
1512                                        buf[ret] = tempbuffer[i];
1513                                        ret++;
1514                                }
1515                        }
1516                }
1517
1518                pointer += 2 + tuple.TupleDataLen;
1519
1520                if (pointer >= (off + count))
1521                        break;
1522
1523                if (tuple.TupleCode == CISTPL_END)
1524                        break;
1525                status = pccard_get_next_tuple(s, BIND_FN_ALL, &tuple);
1526        }
1527
1528        kfree(tempbuffer);
1529 free_tuple:
1530        kfree(tuplebuffer);
1531
1532        return ret;
1533}
1534
1535
1536static ssize_t pccard_show_cis(struct file *filp, struct kobject *kobj,
1537                               struct bin_attribute *bin_attr,
1538                               char *buf, loff_t off, size_t count)
1539{
1540        unsigned int size = 0x200;
1541
1542        if (off >= size)
1543                count = 0;
1544        else {
1545                struct pcmcia_socket *s;
1546                unsigned int chains = 1;
1547
1548                if (off + count > size)
1549                        count = size - off;
1550
1551                s = to_socket(container_of(kobj, struct device, kobj));
1552
1553                if (!(s->state & SOCKET_PRESENT))
1554                        return -ENODEV;
1555                if (!s->functions && pccard_validate_cis(s, &chains))
1556                        return -EIO;
1557                if (!chains)
1558                        return -ENODATA;
1559
1560                count = pccard_extract_cis(s, buf, off, count);
1561        }
1562
1563        return count;
1564}
1565
1566
1567static ssize_t pccard_store_cis(struct file *filp, struct kobject *kobj,
1568                                struct bin_attribute *bin_attr,
1569                                char *buf, loff_t off, size_t count)
1570{
1571        struct pcmcia_socket *s;
1572        int error;
1573
1574        s = to_socket(container_of(kobj, struct device, kobj));
1575
1576        if (off)
1577                return -EINVAL;
1578
1579        if (count >= CISTPL_MAX_CIS_SIZE)
1580                return -EINVAL;
1581
1582        if (!(s->state & SOCKET_PRESENT))
1583                return -ENODEV;
1584
1585        error = pcmcia_replace_cis(s, buf, count);
1586        if (error)
1587                return -EIO;
1588
1589        pcmcia_parse_uevents(s, PCMCIA_UEVENT_REQUERY);
1590
1591        return count;
1592}
1593
1594
1595struct bin_attribute pccard_cis_attr = {
1596        .attr = { .name = "cis", .mode = S_IRUGO | S_IWUSR },
1597        .size = 0x200,
1598        .read = pccard_show_cis,
1599        .write = pccard_store_cis,
1600};
1601
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