1 files changed, 1490 insertions, 0 deletions

diff --git a/drivers/pcmcia/cistpl.c b/drivers/pcmcia/cistpl.c
new file mode 100644
index 000000000000..e29a6ddf2fd7
--- /dev/null
+++ b/drivers/pcmcia/cistpl.c
@@ -0,0 +1,1490 @@
+/*
+ * cistpl.c -- 16-bit PCMCIA Card Information Structure parser
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * The initial developer of the original code is David A. Hinds
+ * <dahinds@users.sourceforge.net>.  Portions created by David A. Hinds
+ * are Copyright (C) 1999 David A. Hinds.  All Rights Reserved.
+ *
+ * (C) 1999             David A. Hinds
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/major.h>
+#include <linux/errno.h>
+#include <linux/timer.h>
+#include <linux/slab.h>
+#include <linux/mm.h>
+#include <linux/sched.h>
+#include <linux/pci.h>
+#include <linux/ioport.h>
+#include <asm/io.h>
+#include <asm/byteorder.h>
+
+#include <pcmcia/cs_types.h>
+#include <pcmcia/ss.h>
+#include <pcmcia/cs.h>
+#include <pcmcia/bulkmem.h>
+#include <pcmcia/cisreg.h>
+#include <pcmcia/cistpl.h>
+#include "cs_internal.h"
+
+static const u_char mantissa[] = {
+    10, 12, 13, 15, 20, 25, 30, 35,
+    40, 45, 50, 55, 60, 70, 80, 90
+};
+
+static const u_int exponent[] = {
+    1, 10, 100, 1000, 10000, 100000, 1000000, 10000000
+};
+
+/* Convert an extended speed byte to a time in nanoseconds */
+#define SPEED_CVT(v) \
+    (mantissa[(((v)>>3)&15)-1] * exponent[(v)&7] / 10)
+/* Convert a power byte to a current in 0.1 microamps */
+#define POWER_CVT(v) \
+    (mantissa[((v)>>3)&15] * exponent[(v)&7] / 10)
+#define POWER_SCALE(v)          (exponent[(v)&7])
+
+/* Upper limit on reasonable # of tuples */
+#define MAX_TUPLES              200
+
+/*====================================================================*/
+
+/* Parameters that can be set with 'insmod' */
+
+#define INT_MODULE_PARM(n, v) static int n = v; module_param(n, int, 0444)
+
+INT_MODULE_PARM(cis_width,      0);             /* 16-bit CIS? */
+
+void release_cis_mem(struct pcmcia_socket *s)
+{
+    if (s->cis_mem.flags & MAP_ACTIVE) {
+        s->cis_mem.flags &= ~MAP_ACTIVE;
+        s->ops->set_mem_map(s, &s->cis_mem);
+        if (s->cis_mem.res) {
+            release_resource(s->cis_mem.res);
+            kfree(s->cis_mem.res);
+            s->cis_mem.res = NULL;
+        }
+        iounmap(s->cis_virt);
+        s->cis_virt = NULL;
+    }
+}
+EXPORT_SYMBOL(release_cis_mem);
+
+/*
+ * Map the card memory at "card_offset" into virtual space.
+ * If flags & MAP_ATTRIB, map the attribute space, otherwise
+ * map the memory space.
+ */
+static void __iomem *
+set_cis_map(struct pcmcia_socket *s, unsigned int card_offset, unsigned int flags)
+{
+    pccard_mem_map *mem = &s->cis_mem;
+    if (!(s->features & SS_CAP_STATIC_MAP) && mem->res == NULL) {
+        mem->res = find_mem_region(0, s->map_size, s->map_size, 0, s);
+        if (mem->res == NULL) {
+            printk(KERN_NOTICE "cs: unable to map card memory!\n");
+            return NULL;
+        }
+        s->cis_virt = ioremap(mem->res->start, s->map_size);
+    }
+    mem->card_start = card_offset;
+    mem->flags = flags;
+    s->ops->set_mem_map(s, mem);
+    if (s->features & SS_CAP_STATIC_MAP) {
+        if (s->cis_virt)
+            iounmap(s->cis_virt);
+        s->cis_virt = ioremap(mem->static_start, s->map_size);
+    }
+    return s->cis_virt;
+}
+
+/*======================================================================
+
+    Low-level functions to read and write CIS memory.  I think the
+    write routine is only useful for writing one-byte registers.
+    
+======================================================================*/
+
+/* Bits in attr field */
+#define IS_ATTR         1
+#define IS_INDIRECT     8
+
+int read_cis_mem(struct pcmcia_socket *s, int attr, u_int addr,
+                 u_int len, void *ptr)
+{
+    void __iomem *sys, *end;
+    unsigned char *buf = ptr;
+    
+    cs_dbg(s, 3, "read_cis_mem(%d, %#x, %u)\n", attr, addr, len);
+
+    if (attr & IS_INDIRECT) {
+        /* Indirect accesses use a bunch of special registers at fixed
+           locations in common memory */
+        u_char flags = ICTRL0_COMMON|ICTRL0_AUTOINC|ICTRL0_BYTEGRAN;
+        if (attr & IS_ATTR) {
+            addr *= 2;
+            flags = ICTRL0_AUTOINC;
+        }
+
+        sys = set_cis_map(s, 0, MAP_ACTIVE | ((cis_width) ? MAP_16BIT : 0));
+        if (!sys) {
+            memset(ptr, 0xff, len);
+            return -1;
+        }
+
+        writeb(flags, sys+CISREG_ICTRL0);
+        writeb(addr & 0xff, sys+CISREG_IADDR0);
+        writeb((addr>>8) & 0xff, sys+CISREG_IADDR1);
+        writeb((addr>>16) & 0xff, sys+CISREG_IADDR2);
+        writeb((addr>>24) & 0xff, sys+CISREG_IADDR3);
+        for ( ; len > 0; len--, buf++)
+            *buf = readb(sys+CISREG_IDATA0);
+    } else {
+        u_int inc = 1, card_offset, flags;
+
+        flags = MAP_ACTIVE | ((cis_width) ? MAP_16BIT : 0);
+        if (attr) {
+            flags |= MAP_ATTRIB;
+            inc++;
+            addr *= 2;
+        }
+
+        card_offset = addr & ~(s->map_size-1);
+        while (len) {
+            sys = set_cis_map(s, card_offset, flags);
+            if (!sys) {
+                memset(ptr, 0xff, len);
+                return -1;
+            }
+            end = sys + s->map_size;
+            sys = sys + (addr & (s->map_size-1));
+            for ( ; len > 0; len--, buf++, sys += inc) {
+                if (sys == end)
+                    break;
+                *buf = readb(sys);
+            }
+            card_offset += s->map_size;
+            addr = 0;
+        }
+    }
+    cs_dbg(s, 3, "  %#2.2x %#2.2x %#2.2x %#2.2x ...\n",
+          *(u_char *)(ptr+0), *(u_char *)(ptr+1),
+          *(u_char *)(ptr+2), *(u_char *)(ptr+3));
+    return 0;
+}
+
+void write_cis_mem(struct pcmcia_socket *s, int attr, u_int addr,
+                   u_int len, void *ptr)
+{
+    void __iomem *sys, *end;
+    unsigned char *buf = ptr;
+    
+    cs_dbg(s, 3, "write_cis_mem(%d, %#x, %u)\n", attr, addr, len);
+
+    if (attr & IS_INDIRECT) {
+        /* Indirect accesses use a bunch of special registers at fixed
+           locations in common memory */
+        u_char flags = ICTRL0_COMMON|ICTRL0_AUTOINC|ICTRL0_BYTEGRAN;
+        if (attr & IS_ATTR) {
+            addr *= 2;
+            flags = ICTRL0_AUTOINC;
+        }
+
+        sys = set_cis_map(s, 0, MAP_ACTIVE | ((cis_width) ? MAP_16BIT : 0));
+        if (!sys)
+                return; /* FIXME: Error */
+
+        writeb(flags, sys+CISREG_ICTRL0);
+        writeb(addr & 0xff, sys+CISREG_IADDR0);
+        writeb((addr>>8) & 0xff, sys+CISREG_IADDR1);
+        writeb((addr>>16) & 0xff, sys+CISREG_IADDR2);
+        writeb((addr>>24) & 0xff, sys+CISREG_IADDR3);
+        for ( ; len > 0; len--, buf++)
+            writeb(*buf, sys+CISREG_IDATA0);
+    } else {
+        u_int inc = 1, card_offset, flags;
+
+        flags = MAP_ACTIVE | ((cis_width) ? MAP_16BIT : 0);
+        if (attr & IS_ATTR) {
+            flags |= MAP_ATTRIB;
+            inc++;
+            addr *= 2;
+        }
+
+        card_offset = addr & ~(s->map_size-1);
+        while (len) {
+            sys = set_cis_map(s, card_offset, flags);
+            if (!sys)
+                return; /* FIXME: error */
+
+            end = sys + s->map_size;
+            sys = sys + (addr & (s->map_size-1));
+            for ( ; len > 0; len--, buf++, sys += inc) {
+                if (sys == end)
+                    break;
+                writeb(*buf, sys);
+            }
+            card_offset += s->map_size;
+            addr = 0;
+        }
+    }
+}
+
+/*======================================================================
+
+    This is a wrapper around read_cis_mem, with the same interface,
+    but which caches information, for cards whose CIS may not be
+    readable all the time.
+    
+======================================================================*/
+
+static void read_cis_cache(struct pcmcia_socket *s, int attr, u_int addr,
+                           u_int len, void *ptr)
+{
+    struct cis_cache_entry *cis;
+    int ret;
+
+    if (s->fake_cis) {
+        if (s->fake_cis_len > addr+len)
+            memcpy(ptr, s->fake_cis+addr, len);
+        else
+            memset(ptr, 0xff, len);
+        return;
+    }
+
+    list_for_each_entry(cis, &s->cis_cache, node) {
+        if (cis->addr == addr && cis->len == len && cis->attr == attr) {
+            memcpy(ptr, cis->cache, len);
+            return;
+        }
+    }
+
+#ifdef CONFIG_CARDBUS
+    if (s->state & SOCKET_CARDBUS)
+        ret = read_cb_mem(s, attr, addr, len, ptr);
+    else
+#endif
+        ret = read_cis_mem(s, attr, addr, len, ptr);
+
+        if (ret == 0) {
+                /* Copy data into the cache */
+                cis = kmalloc(sizeof(struct cis_cache_entry) + len, GFP_KERNEL);
+                if (cis) {
+                        cis->addr = addr;
+                        cis->len = len;
+                        cis->attr = attr;
+                        memcpy(cis->cache, ptr, len);
+                        list_add(&cis->node, &s->cis_cache);
+                }
+        }
+}
+
+static void
+remove_cis_cache(struct pcmcia_socket *s, int attr, u_int addr, u_int len)
+{
+        struct cis_cache_entry *cis;
+
+        list_for_each_entry(cis, &s->cis_cache, node)
+                if (cis->addr == addr && cis->len == len && cis->attr == attr) {
+                        list_del(&cis->node);
+                        kfree(cis);
+                        break;
+                }
+}
+
+void destroy_cis_cache(struct pcmcia_socket *s)
+{
+        struct list_head *l, *n;
+
+        list_for_each_safe(l, n, &s->cis_cache) {
+                struct cis_cache_entry *cis = list_entry(l, struct cis_cache_entry, node);
+
+                list_del(&cis->node);
+                kfree(cis);
+        }
+
+        /*
+         * If there was a fake CIS, destroy that as well.
+         */
+        if (s->fake_cis) {
+                kfree(s->fake_cis);
+                s->fake_cis = NULL;
+        }
+}
+EXPORT_SYMBOL(destroy_cis_cache);
+
+/*======================================================================
+
+    This verifies if the CIS of a card matches what is in the CIS
+    cache.
+    
+======================================================================*/
+
+int verify_cis_cache(struct pcmcia_socket *s)
+{
+        struct cis_cache_entry *cis;
+        char *buf;
+
+        buf = kmalloc(256, GFP_KERNEL);
+        if (buf == NULL)
+                return -1;
+        list_for_each_entry(cis, &s->cis_cache, node) {
+                int len = cis->len;
+
+                if (len > 256)
+                        len = 256;
+#ifdef CONFIG_CARDBUS
+                if (s->state & SOCKET_CARDBUS)
+                        read_cb_mem(s, cis->attr, cis->addr, len, buf);
+                else
+#endif
+                        read_cis_mem(s, cis->attr, cis->addr, len, buf);
+
+                if (memcmp(buf, cis->cache, len) != 0) {
+                        kfree(buf);
+                        return -1;
+                }
+        }
+        kfree(buf);
+        return 0;
+}
+
+/*======================================================================
+
+    For really bad cards, we provide a facility for uploading a
+    replacement CIS.
+    
+======================================================================*/
+
+int pcmcia_replace_cis(struct pcmcia_socket *s, cisdump_t *cis)
+{
+    if (s->fake_cis != NULL) {
+        kfree(s->fake_cis);
+        s->fake_cis = NULL;
+    }
+    if (cis->Length > CISTPL_MAX_CIS_SIZE)
+        return CS_BAD_SIZE;
+    s->fake_cis = kmalloc(cis->Length, GFP_KERNEL);
+    if (s->fake_cis == NULL)
+        return CS_OUT_OF_RESOURCE;
+    s->fake_cis_len = cis->Length;
+    memcpy(s->fake_cis, cis->Data, cis->Length);
+    return CS_SUCCESS;
+}
+
+/*======================================================================
+
+    The high-level CIS tuple services
+    
+======================================================================*/
+
+typedef struct tuple_flags {
+    u_int               link_space:4;
+    u_int               has_link:1;
+    u_int               mfc_fn:3;
+    u_int               space:4;
+} tuple_flags;
+
+#define LINK_SPACE(f)   (((tuple_flags *)(&(f)))->link_space)
+#define HAS_LINK(f)     (((tuple_flags *)(&(f)))->has_link)
+#define MFC_FN(f)       (((tuple_flags *)(&(f)))->mfc_fn)
+#define SPACE(f)        (((tuple_flags *)(&(f)))->space)
+
+int pccard_get_next_tuple(struct pcmcia_socket *s, unsigned int func, tuple_t *tuple);
+
+int pccard_get_first_tuple(struct pcmcia_socket *s, unsigned int function, tuple_t *tuple)
+{
+    if (!s)
+        return CS_BAD_HANDLE;
+    if (!(s->state & SOCKET_PRESENT))
+        return CS_NO_CARD;
+    tuple->TupleLink = tuple->Flags = 0;
+#ifdef CONFIG_CARDBUS
+    if (s->state & SOCKET_CARDBUS) {
+        struct pci_dev *dev = s->cb_dev;
+        u_int ptr;
+        pci_bus_read_config_dword(dev->subordinate, 0, PCI_CARDBUS_CIS, &ptr);
+        tuple->CISOffset = ptr & ~7;
+        SPACE(tuple->Flags) = (ptr & 7);
+    } else
+#endif
+    {
+        /* Assume presence of a LONGLINK_C to address 0 */
+        tuple->CISOffset = tuple->LinkOffset = 0;
+        SPACE(tuple->Flags) = HAS_LINK(tuple->Flags) = 1;
+    }
+    if (!(s->state & SOCKET_CARDBUS) && (s->functions > 1) &&
+        !(tuple->Attributes & TUPLE_RETURN_COMMON)) {
+        cisdata_t req = tuple->DesiredTuple;
+        tuple->DesiredTuple = CISTPL_LONGLINK_MFC;
+        if (pccard_get_next_tuple(s, function, tuple) == CS_SUCCESS) {
+            tuple->DesiredTuple = CISTPL_LINKTARGET;
+            if (pccard_get_next_tuple(s, function, tuple) != CS_SUCCESS)
+                return CS_NO_MORE_ITEMS;
+        } else
+            tuple->CISOffset = tuple->TupleLink = 0;
+        tuple->DesiredTuple = req;
+    }
+    return pccard_get_next_tuple(s, function, tuple);
+}
+EXPORT_SYMBOL(pccard_get_first_tuple);
+
+static int follow_link(struct pcmcia_socket *s, tuple_t *tuple)
+{
+    u_char link[5];
+    u_int ofs;
+
+    if (MFC_FN(tuple->Flags)) {
+        /* Get indirect link from the MFC tuple */
+        read_cis_cache(s, LINK_SPACE(tuple->Flags),
+                       tuple->LinkOffset, 5, link);
+        ofs = le32_to_cpu(*(u_int *)(link+1));
+        SPACE(tuple->Flags) = (link[0] == CISTPL_MFC_ATTR);
+        /* Move to the next indirect link */
+        tuple->LinkOffset += 5;
+        MFC_FN(tuple->Flags)--;
+    } else if (HAS_LINK(tuple->Flags)) {
+        ofs = tuple->LinkOffset;
+        SPACE(tuple->Flags) = LINK_SPACE(tuple->Flags);
+        HAS_LINK(tuple->Flags) = 0;
+    } else {
+        return -1;
+    }
+    if (!(s->state & SOCKET_CARDBUS) && SPACE(tuple->Flags)) {
+        /* This is ugly, but a common CIS error is to code the long
+           link offset incorrectly, so we check the right spot... */
+        read_cis_cache(s, SPACE(tuple->Flags), ofs, 5, link);
+        if ((link[0] == CISTPL_LINKTARGET) && (link[1] >= 3) &&
+            (strncmp(link+2, "CIS", 3) == 0))
+            return ofs;
+        remove_cis_cache(s, SPACE(tuple->Flags), ofs, 5);
+        /* Then, we try the wrong spot... */
+        ofs = ofs >> 1;
+    }
+    read_cis_cache(s, SPACE(tuple->Flags), ofs, 5, link);
+    if ((link[0] == CISTPL_LINKTARGET) && (link[1] >= 3) &&
+        (strncmp(link+2, "CIS", 3) == 0))
+        return ofs;
+    remove_cis_cache(s, SPACE(tuple->Flags), ofs, 5);
+    return -1;
+}
+
+int pccard_get_next_tuple(struct pcmcia_socket *s, unsigned int function, tuple_t *tuple)
+{
+    u_char link[2], tmp;
+    int ofs, i, attr;
+
+    if (!s)
+        return CS_BAD_HANDLE;
+    if (!(s->state & SOCKET_PRESENT))
+        return CS_NO_CARD;
+
+    link[1] = tuple->TupleLink;
+    ofs = tuple->CISOffset + tuple->TupleLink;
+    attr = SPACE(tuple->Flags);
+
+    for (i = 0; i < MAX_TUPLES; i++) {
+        if (link[1] == 0xff) {
+            link[0] = CISTPL_END;
+        } else {
+            read_cis_cache(s, attr, ofs, 2, link);
+            if (link[0] == CISTPL_NULL) {
+                ofs++; continue;
+            }
+        }
+        
+        /* End of chain?  Follow long link if possible */
+        if (link[0] == CISTPL_END) {
+            if ((ofs = follow_link(s, tuple)) < 0)
+                return CS_NO_MORE_ITEMS;
+            attr = SPACE(tuple->Flags);
+            read_cis_cache(s, attr, ofs, 2, link);
+        }
+
+        /* Is this a link tuple?  Make a note of it */
+        if ((link[0] == CISTPL_LONGLINK_A) ||
+            (link[0] == CISTPL_LONGLINK_C) ||
+            (link[0] == CISTPL_LONGLINK_MFC) ||
+            (link[0] == CISTPL_LINKTARGET) ||
+            (link[0] == CISTPL_INDIRECT) ||
+            (link[0] == CISTPL_NO_LINK)) {
+            switch (link[0]) {
+            case CISTPL_LONGLINK_A:
+                HAS_LINK(tuple->Flags) = 1;
+                LINK_SPACE(tuple->Flags) = attr | IS_ATTR;
+                read_cis_cache(s, attr, ofs+2, 4, &tuple->LinkOffset);
+                break;
+            case CISTPL_LONGLINK_C:
+                HAS_LINK(tuple->Flags) = 1;
+                LINK_SPACE(tuple->Flags) = attr & ~IS_ATTR;
+                read_cis_cache(s, attr, ofs+2, 4, &tuple->LinkOffset);
+                break;
+            case CISTPL_INDIRECT:
+                HAS_LINK(tuple->Flags) = 1;
+                LINK_SPACE(tuple->Flags) = IS_ATTR | IS_INDIRECT;
+                tuple->LinkOffset = 0;
+                break;
+            case CISTPL_LONGLINK_MFC:
+                tuple->LinkOffset = ofs + 3;
+                LINK_SPACE(tuple->Flags) = attr;
+                if (function == BIND_FN_ALL) {
+                    /* Follow all the MFC links */
+                    read_cis_cache(s, attr, ofs+2, 1, &tmp);
+                    MFC_FN(tuple->Flags) = tmp;
+                } else {
+                    /* Follow exactly one of the links */
+                    MFC_FN(tuple->Flags) = 1;
+                    tuple->LinkOffset += function * 5;
+                }
+                break;
+            case CISTPL_NO_LINK:
+                HAS_LINK(tuple->Flags) = 0;
+                break;
+            }
+            if ((tuple->Attributes & TUPLE_RETURN_LINK) &&
+                (tuple->DesiredTuple == RETURN_FIRST_TUPLE))
+                break;
+        } else
+            if (tuple->DesiredTuple == RETURN_FIRST_TUPLE)
+                break;
+        
+        if (link[0] == tuple->DesiredTuple)
+            break;
+        ofs += link[1] + 2;
+    }
+    if (i == MAX_TUPLES) {
+        cs_dbg(s, 1, "cs: overrun in pcmcia_get_next_tuple\n");
+        return CS_NO_MORE_ITEMS;
+    }
+    
+    tuple->TupleCode = link[0];
+    tuple->TupleLink = link[1];
+    tuple->CISOffset = ofs + 2;
+    return CS_SUCCESS;
+}
+EXPORT_SYMBOL(pccard_get_next_tuple);
+
+/*====================================================================*/
+
+#define _MIN(a, b)              (((a) < (b)) ? (a) : (b))
+
+int pccard_get_tuple_data(struct pcmcia_socket *s, tuple_t *tuple)
+{
+    u_int len;
+
+    if (!s)
+        return CS_BAD_HANDLE;
+
+    if (tuple->TupleLink < tuple->TupleOffset)
+        return CS_NO_MORE_ITEMS;
+    len = tuple->TupleLink - tuple->TupleOffset;
+    tuple->TupleDataLen = tuple->TupleLink;
+    if (len == 0)
+        return CS_SUCCESS;
+    read_cis_cache(s, SPACE(tuple->Flags),
+                   tuple->CISOffset + tuple->TupleOffset,
+                   _MIN(len, tuple->TupleDataMax), tuple->TupleData);
+    return CS_SUCCESS;
+}
+EXPORT_SYMBOL(pccard_get_tuple_data);
+
+
+/*======================================================================
+
+    Parsing routines for individual tuples
+    
+======================================================================*/
+
+static int parse_device(tuple_t *tuple, cistpl_device_t *device)
+{
+    int i;
+    u_char scale;
+    u_char *p, *q;
+
+    p = (u_char *)tuple->TupleData;
+    q = p + tuple->TupleDataLen;
+
+    device->ndev = 0;
+    for (i = 0; i < CISTPL_MAX_DEVICES; i++) {
+        
+        if (*p == 0xff) break;
+        device->dev[i].type = (*p >> 4);
+        device->dev[i].wp = (*p & 0x08) ? 1 : 0;
+        switch (*p & 0x07) {
+        case 0: device->dev[i].speed = 0;   break;
+        case 1: device->dev[i].speed = 250; break;
+        case 2: device->dev[i].speed = 200; break;
+        case 3: device->dev[i].speed = 150; break;
+        case 4: device->dev[i].speed = 100; break;
+        case 7:
+            if (++p == q) return CS_BAD_TUPLE;
+            device->dev[i].speed = SPEED_CVT(*p);
+            while (*p & 0x80)
+                if (++p == q) return CS_BAD_TUPLE;
+            break;
+        default:
+            return CS_BAD_TUPLE;
+        }
+
+        if (++p == q) return CS_BAD_TUPLE;
+        if (*p == 0xff) break;
+        scale = *p & 7;
+        if (scale == 7) return CS_BAD_TUPLE;
+        device->dev[i].size = ((*p >> 3) + 1) * (512 << (scale*2));
+        device->ndev++;
+        if (++p == q) break;
+    }
+    
+    return CS_SUCCESS;
+}
+
+/*====================================================================*/
+
+static int parse_checksum(tuple_t *tuple, cistpl_checksum_t *csum)
+{
+    u_char *p;
+    if (tuple->TupleDataLen < 5)
+        return CS_BAD_TUPLE;
+    p = (u_char *)tuple->TupleData;
+    csum->addr = tuple->CISOffset+(short)le16_to_cpu(*(u_short *)p)-2;
+    csum->len = le16_to_cpu(*(u_short *)(p + 2));
+    csum->sum = *(p+4);
+    return CS_SUCCESS;
+}
+
+/*====================================================================*/
+
+static int parse_longlink(tuple_t *tuple, cistpl_longlink_t *link)
+{
+    if (tuple->TupleDataLen < 4)
+        return CS_BAD_TUPLE;
+    link->addr = le32_to_cpu(*(u_int *)tuple->TupleData);
+    return CS_SUCCESS;
+}
+
+/*====================================================================*/
+
+static int parse_longlink_mfc(tuple_t *tuple,
+                              cistpl_longlink_mfc_t *link)
+{
+    u_char *p;
+    int i;
+    
+    p = (u_char *)tuple->TupleData;
+    
+    link->nfn = *p; p++;
+    if (tuple->TupleDataLen <= link->nfn*5)
+        return CS_BAD_TUPLE;
+    for (i = 0; i < link->nfn; i++) {
+        link->fn[i].space = *p; p++;
+        link->fn[i].addr = le32_to_cpu(*(u_int *)p); p += 4;
+    }
+    return CS_SUCCESS;
+}
+
+/*====================================================================*/
+
+static int parse_strings(u_char *p, u_char *q, int max,
+                         char *s, u_char *ofs, u_char *found)
+{
+    int i, j, ns;
+
+    if (p == q) return CS_BAD_TUPLE;
+    ns = 0; j = 0;
+    for (i = 0; i < max; i++) {
+        if (*p == 0xff) break;
+        ofs[i] = j;
+        ns++;
+        for (;;) {
+            s[j++] = (*p == 0xff) ? '\0' : *p;
+            if ((*p == '\0') || (*p == 0xff)) break;
+            if (++p == q) return CS_BAD_TUPLE;
+        }
+        if ((*p == 0xff) || (++p == q)) break;
+    }
+    if (found) {
+        *found = ns;
+        return CS_SUCCESS;
+    } else {
+        return (ns == max) ? CS_SUCCESS : CS_BAD_TUPLE;
+    }
+}
+
+/*====================================================================*/
+
+static int parse_vers_1(tuple_t *tuple, cistpl_vers_1_t *vers_1)
+{
+    u_char *p, *q;
+    
+    p = (u_char *)tuple->TupleData;
+    q = p + tuple->TupleDataLen;
+    
+    vers_1->major = *p; p++;
+    vers_1->minor = *p; p++;
+    if (p >= q) return CS_BAD_TUPLE;
+
+    return parse_strings(p, q, CISTPL_VERS_1_MAX_PROD_STRINGS,
+                         vers_1->str, vers_1->ofs, &vers_1->ns);
+}
+
+/*====================================================================*/
+
+static int parse_altstr(tuple_t *tuple, cistpl_altstr_t *altstr)
+{
+    u_char *p, *q;
+    
+    p = (u_char *)tuple->TupleData;
+    q = p + tuple->TupleDataLen;
+    
+    return parse_strings(p, q, CISTPL_MAX_ALTSTR_STRINGS,
+                         altstr->str, altstr->ofs, &altstr->ns);
+}
+
+/*====================================================================*/
+
+static int parse_jedec(tuple_t *tuple, cistpl_jedec_t *jedec)
+{
+    u_char *p, *q;
+    int nid;
+
+    p = (u_char *)tuple->TupleData;
+    q = p + tuple->TupleDataLen;
+
+    for (nid = 0; nid < CISTPL_MAX_DEVICES; nid++) {
+        if (p > q-2) break;
+        jedec->id[nid].mfr = p[0];
+        jedec->id[nid].info = p[1];
+        p += 2;
+    }
+    jedec->nid = nid;
+    return CS_SUCCESS;
+}
+
+/*====================================================================*/
+
+static int parse_manfid(tuple_t *tuple, cistpl_manfid_t *m)
+{
+    u_short *p;
+    if (tuple->TupleDataLen < 4)
+        return CS_BAD_TUPLE;
+    p = (u_short *)tuple->TupleData;
+    m->manf = le16_to_cpu(p[0]);
+    m->card = le16_to_cpu(p[1]);
+    return CS_SUCCESS;
+}
+
+/*====================================================================*/
+
+static int parse_funcid(tuple_t *tuple, cistpl_funcid_t *f)
+{
+    u_char *p;
+    if (tuple->TupleDataLen < 2)
+        return CS_BAD_TUPLE;
+    p = (u_char *)tuple->TupleData;
+    f->func = p[0];
+    f->sysinit = p[1];
+    return CS_SUCCESS;
+}
+
+/*====================================================================*/
+
+static int parse_funce(tuple_t *tuple, cistpl_funce_t *f)
+{
+    u_char *p;
+    int i;
+    if (tuple->TupleDataLen < 1)
+        return CS_BAD_TUPLE;
+    p = (u_char *)tuple->TupleData;
+    f->type = p[0];
+    for (i = 1; i < tuple->TupleDataLen; i++)
+        f->data[i-1] = p[i];
+    return CS_SUCCESS;
+}
+
+/*====================================================================*/
+
+static int parse_config(tuple_t *tuple, cistpl_config_t *config)
+{
+    int rasz, rmsz, i;
+    u_char *p;
+
+    p = (u_char *)tuple->TupleData;
+    rasz = *p & 0x03;
+    rmsz = (*p & 0x3c) >> 2;
+    if (tuple->TupleDataLen < rasz+rmsz+4)
+        return CS_BAD_TUPLE;
+    config->last_idx = *(++p);
+    p++;
+    config->base = 0;
+    for (i = 0; i <= rasz; i++)
+        config->base += p[i] << (8*i);
+    p += rasz+1;
+    for (i = 0; i < 4; i++)
+        config->rmask[i] = 0;
+    for (i = 0; i <= rmsz; i++)
+        config->rmask[i>>2] += p[i] << (8*(i%4));
+    config->subtuples = tuple->TupleDataLen - (rasz+rmsz+4);
+    return CS_SUCCESS;
+}
+
+/*======================================================================
+
+    The following routines are all used to parse the nightmarish
+    config table entries.
+    
+======================================================================*/
+
+static u_char *parse_power(u_char *p, u_char *q,
+                           cistpl_power_t *pwr)
+{
+    int i;
+    u_int scale;
+
+    if (p == q) return NULL;
+    pwr->present = *p;
+    pwr->flags = 0;
+    p++;
+    for (i = 0; i < 7; i++)
+        if (pwr->present & (1<<i)) {
+            if (p == q) return NULL;
+            pwr->param[i] = POWER_CVT(*p);
+            scale = POWER_SCALE(*p);
+            while (*p & 0x80) {
+                if (++p == q) return NULL;
+                if ((*p & 0x7f) < 100)
+                    pwr->param[i] += (*p & 0x7f) * scale / 100;
+                else if (*p == 0x7d)
+                    pwr->flags |= CISTPL_POWER_HIGHZ_OK;
+                else if (*p == 0x7e)
+                    pwr->param[i] = 0;
+                else if (*p == 0x7f)
+                    pwr->flags |= CISTPL_POWER_HIGHZ_REQ;
+                else
+                    return NULL;
+            }
+            p++;
+        }
+    return p;
+}
+
+/*====================================================================*/
+
+static u_char *parse_timing(u_char *p, u_char *q,
+                            cistpl_timing_t *timing)
+{
+    u_char scale;
+
+    if (p == q) return NULL;
+    scale = *p;
+    if ((scale & 3) != 3) {
+        if (++p == q) return NULL;
+        timing->wait = SPEED_CVT(*p);
+        timing->waitscale = exponent[scale & 3];
+    } else
+        timing->wait = 0;
+    scale >>= 2;
+    if ((scale & 7) != 7) {
+        if (++p == q) return NULL;
+        timing->ready = SPEED_CVT(*p);
+        timing->rdyscale = exponent[scale & 7];
+    } else
+        timing->ready = 0;
+    scale >>= 3;
+    if (scale != 7) {
+        if (++p == q) return NULL;
+        timing->reserved = SPEED_CVT(*p);
+        timing->rsvscale = exponent[scale];
+    } else
+        timing->reserved = 0;
+    p++;
+    return p;
+}
+
+/*====================================================================*/
+
+static u_char *parse_io(u_char *p, u_char *q, cistpl_io_t *io)
+{
+    int i, j, bsz, lsz;
+
+    if (p == q) return NULL;
+    io->flags = *p;
+
+    if (!(*p & 0x80)) {
+        io->nwin = 1;
+        io->win[0].base = 0;
+        io->win[0].len = (1 << (io->flags & CISTPL_IO_LINES_MASK));
+        return p+1;
+    }
+    
+    if (++p == q) return NULL;
+    io->nwin = (*p & 0x0f) + 1;
+    bsz = (*p & 0x30) >> 4;
+    if (bsz == 3) bsz++;
+    lsz = (*p & 0xc0) >> 6;
+    if (lsz == 3) lsz++;
+    p++;
+    
+    for (i = 0; i < io->nwin; i++) {
+        io->win[i].base = 0;
+        io->win[i].len = 1;
+        for (j = 0; j < bsz; j++, p++) {
+            if (p == q) return NULL;
+            io->win[i].base += *p << (j*8);
+        }
+        for (j = 0; j < lsz; j++, p++) {
+            if (p == q) return NULL;
+            io->win[i].len += *p << (j*8);
+        }
+    }
+    return p;
+}
+
+/*====================================================================*/
+
+static u_char *parse_mem(u_char *p, u_char *q, cistpl_mem_t *mem)
+{
+    int i, j, asz, lsz, has_ha;
+    u_int len, ca, ha;
+
+    if (p == q) return NULL;
+
+    mem->nwin = (*p & 0x07) + 1;
+    lsz = (*p & 0x18) >> 3;
+    asz = (*p & 0x60) >> 5;
+    has_ha = (*p & 0x80);
+    if (++p == q) return NULL;
+    
+    for (i = 0; i < mem->nwin; i++) {
+        len = ca = ha = 0;
+        for (j = 0; j < lsz; j++, p++) {
+            if (p == q) return NULL;
+            len += *p << (j*8);
+        }
+        for (j = 0; j < asz; j++, p++) {
+            if (p == q) return NULL;
+            ca += *p << (j*8);
+        }
+        if (has_ha)
+            for (j = 0; j < asz; j++, p++) {
+                if (p == q) return NULL;
+                ha += *p << (j*8);
+            }
+        mem->win[i].len = len << 8;
+        mem->win[i].card_addr = ca << 8;
+        mem->win[i].host_addr = ha << 8;
+    }
+    return p;
+}
+
+/*====================================================================*/
+
+static u_char *parse_irq(u_char *p, u_char *q, cistpl_irq_t *irq)
+{
+    if (p == q) return NULL;
+    irq->IRQInfo1 = *p; p++;
+    if (irq->IRQInfo1 & IRQ_INFO2_VALID) {
+        if (p+2 > q) return NULL;
+        irq->IRQInfo2 = (p[1]<<8) + p[0];
+        p += 2;
+    }
+    return p;
+}
+
+/*====================================================================*/
+
+static int parse_cftable_entry(tuple_t *tuple,
+                               cistpl_cftable_entry_t *entry)
+{
+    u_char *p, *q, features;
+
+    p = tuple->TupleData;
+    q = p + tuple->TupleDataLen;
+    entry->index = *p & 0x3f;
+    entry->flags = 0;
+    if (*p & 0x40)
+        entry->flags |= CISTPL_CFTABLE_DEFAULT;
+    if (*p & 0x80) {
+        if (++p == q) return CS_BAD_TUPLE;
+        if (*p & 0x10)
+            entry->flags |= CISTPL_CFTABLE_BVDS;
+        if (*p & 0x20)
+            entry->flags |= CISTPL_CFTABLE_WP;
+        if (*p & 0x40)
+            entry->flags |= CISTPL_CFTABLE_RDYBSY;
+        if (*p & 0x80)
+            entry->flags |= CISTPL_CFTABLE_MWAIT;
+        entry->interface = *p & 0x0f;
+    } else
+        entry->interface = 0;
+
+    /* Process optional features */
+    if (++p == q) return CS_BAD_TUPLE;
+    features = *p; p++;
+
+    /* Power options */
+    if ((features & 3) > 0) {
+        p = parse_power(p, q, &entry->vcc);
+        if (p == NULL) return CS_BAD_TUPLE;
+    } else
+        entry->vcc.present = 0;
+    if ((features & 3) > 1) {
+        p = parse_power(p, q, &entry->vpp1);
+        if (p == NULL) return CS_BAD_TUPLE;
+    } else
+        entry->vpp1.present = 0;
+    if ((features & 3) > 2) {
+        p = parse_power(p, q, &entry->vpp2);
+        if (p == NULL) return CS_BAD_TUPLE;
+    } else
+        entry->vpp2.present = 0;
+
+    /* Timing options */
+    if (features & 0x04) {
+        p = parse_timing(p, q, &entry->timing);
+        if (p == NULL) return CS_BAD_TUPLE;
+    } else {
+        entry->timing.wait = 0;
+        entry->timing.ready = 0;
+        entry->timing.reserved = 0;
+    }
+    
+    /* I/O window options */
+    if (features & 0x08) {
+        p = parse_io(p, q, &entry->io);
+        if (p == NULL) return CS_BAD_TUPLE;
+    } else
+        entry->io.nwin = 0;
+    
+    /* Interrupt options */
+    if (features & 0x10) {
+        p = parse_irq(p, q, &entry->irq);
+        if (p == NULL) return CS_BAD_TUPLE;
+    } else
+        entry->irq.IRQInfo1 = 0;
+
+    switch (features & 0x60) {
+    case 0x00:
+        entry->mem.nwin = 0;
+        break;
+    case 0x20:
+        entry->mem.nwin = 1;
+        entry->mem.win[0].len = le16_to_cpu(*(u_short *)p) << 8;
+        entry->mem.win[0].card_addr = 0;
+        entry->mem.win[0].host_addr = 0;
+        p += 2;
+        if (p > q) return CS_BAD_TUPLE;
+        break;
+    case 0x40:
+        entry->mem.nwin = 1;
+        entry->mem.win[0].len = le16_to_cpu(*(u_short *)p) << 8;
+        entry->mem.win[0].card_addr =
+            le16_to_cpu(*(u_short *)(p+2)) << 8;
+        entry->mem.win[0].host_addr = 0;
+        p += 4;
+        if (p > q) return CS_BAD_TUPLE;
+        break;
+    case 0x60:
+        p = parse_mem(p, q, &entry->mem);
+        if (p == NULL) return CS_BAD_TUPLE;
+        break;
+    }
+
+    /* Misc features */
+    if (features & 0x80) {
+        if (p == q) return CS_BAD_TUPLE;
+        entry->flags |= (*p << 8);
+        while (*p & 0x80)
+            if (++p == q) return CS_BAD_TUPLE;
+        p++;
+    }
+
+    entry->subtuples = q-p;
+    
+    return CS_SUCCESS;
+}
+
+/*====================================================================*/
+
+#ifdef CONFIG_CARDBUS
+
+static int parse_bar(tuple_t *tuple, cistpl_bar_t *bar)
+{
+    u_char *p;
+    if (tuple->TupleDataLen < 6)
+        return CS_BAD_TUPLE;
+    p = (u_char *)tuple->TupleData;
+    bar->attr = *p;
+    p += 2;
+    bar->size = le32_to_cpu(*(u_int *)p);
+    return CS_SUCCESS;
+}
+
+static int parse_config_cb(tuple_t *tuple, cistpl_config_t *config)
+{
+    u_char *p;
+    
+    p = (u_char *)tuple->TupleData;
+    if ((*p != 3) || (tuple->TupleDataLen < 6))
+        return CS_BAD_TUPLE;
+    config->last_idx = *(++p);
+    p++;
+    config->base = le32_to_cpu(*(u_int *)p);
+    config->subtuples = tuple->TupleDataLen - 6;
+    return CS_SUCCESS;
+}
+
+static int parse_cftable_entry_cb(tuple_t *tuple,
+                                  cistpl_cftable_entry_cb_t *entry)
+{
+    u_char *p, *q, features;
+
+    p = tuple->TupleData;
+    q = p + tuple->TupleDataLen;
+    entry->index = *p & 0x3f;
+    entry->flags = 0;
+    if (*p & 0x40)
+        entry->flags |= CISTPL_CFTABLE_DEFAULT;
+
+    /* Process optional features */
+    if (++p == q) return CS_BAD_TUPLE;
+    features = *p; p++;
+
+    /* Power options */
+    if ((features & 3) > 0) {
+        p = parse_power(p, q, &entry->vcc);
+        if (p == NULL) return CS_BAD_TUPLE;
+    } else
+        entry->vcc.present = 0;
+    if ((features & 3) > 1) {
+        p = parse_power(p, q, &entry->vpp1);
+        if (p == NULL) return CS_BAD_TUPLE;
+    } else
+        entry->vpp1.present = 0;
+    if ((features & 3) > 2) {
+        p = parse_power(p, q, &entry->vpp2);
+        if (p == NULL) return CS_BAD_TUPLE;
+    } else
+        entry->vpp2.present = 0;
+
+    /* I/O window options */
+    if (features & 0x08) {
+        if (p == q) return CS_BAD_TUPLE;
+        entry->io = *p; p++;
+    } else
+        entry->io = 0;
+    
+    /* Interrupt options */
+    if (features & 0x10) {
+        p = parse_irq(p, q, &entry->irq);
+        if (p == NULL) return CS_BAD_TUPLE;
+    } else
+        entry->irq.IRQInfo1 = 0;
+
+    if (features & 0x20) {
+        if (p == q) return CS_BAD_TUPLE;
+        entry->mem = *p; p++;
+    } else
+        entry->mem = 0;
+
+    /* Misc features */
+    if (features & 0x80) {
+        if (p == q) return CS_BAD_TUPLE;
+        entry->flags |= (*p << 8);
+        if (*p & 0x80) {
+            if (++p == q) return CS_BAD_TUPLE;
+            entry->flags |= (*p << 16);
+        }
+        while (*p & 0x80)
+            if (++p == q) return CS_BAD_TUPLE;
+        p++;
+    }
+
+    entry->subtuples = q-p;
+    
+    return CS_SUCCESS;
+}
+
+#endif
+
+/*====================================================================*/
+
+static int parse_device_geo(tuple_t *tuple, cistpl_device_geo_t *geo)
+{
+    u_char *p, *q;
+    int n;
+
+    p = (u_char *)tuple->TupleData;
+    q = p + tuple->TupleDataLen;
+
+    for (n = 0; n < CISTPL_MAX_DEVICES; n++) {
+        if (p > q-6) break;
+        geo->geo[n].buswidth = p[0];
+        geo->geo[n].erase_block = 1 << (p[1]-1);
+        geo->geo[n].read_block  = 1 << (p[2]-1);
+        geo->geo[n].write_block = 1 << (p[3]-1);
+        geo->geo[n].partition   = 1 << (p[4]-1);
+        geo->geo[n].interleave  = 1 << (p[5]-1);
+        p += 6;
+    }
+    geo->ngeo = n;
+    return CS_SUCCESS;
+}
+
+/*====================================================================*/
+
+static int parse_vers_2(tuple_t *tuple, cistpl_vers_2_t *v2)
+{
+    u_char *p, *q;
+
+    if (tuple->TupleDataLen < 10)
+        return CS_BAD_TUPLE;
+    
+    p = tuple->TupleData;
+    q = p + tuple->TupleDataLen;
+
+    v2->vers = p[0];
+    v2->comply = p[1];
+    v2->dindex = le16_to_cpu(*(u_short *)(p+2));
+    v2->vspec8 = p[6];
+    v2->vspec9 = p[7];
+    v2->nhdr = p[8];
+    p += 9;
+    return parse_strings(p, q, 2, v2->str, &v2->vendor, NULL);
+}
+
+/*====================================================================*/
+
+static int parse_org(tuple_t *tuple, cistpl_org_t *org)
+{
+    u_char *p, *q;
+    int i;
+    
+    p = tuple->TupleData;
+    q = p + tuple->TupleDataLen;
+    if (p == q) return CS_BAD_TUPLE;
+    org->data_org = *p;
+    if (++p == q) return CS_BAD_TUPLE;
+    for (i = 0; i < 30; i++) {
+        org->desc[i] = *p;
+        if (*p == '\0') break;
+        if (++p == q) return CS_BAD_TUPLE;
+    }
+    return CS_SUCCESS;
+}
+
+/*====================================================================*/
+
+static int parse_format(tuple_t *tuple, cistpl_format_t *fmt)
+{
+    u_char *p;
+
+    if (tuple->TupleDataLen < 10)
+        return CS_BAD_TUPLE;
+
+    p = tuple->TupleData;
+
+    fmt->type = p[0];
+    fmt->edc = p[1];
+    fmt->offset = le32_to_cpu(*(u_int *)(p+2));
+    fmt->length = le32_to_cpu(*(u_int *)(p+6));
+
+    return CS_SUCCESS;
+}
+
+/*====================================================================*/
+
+int pccard_parse_tuple(tuple_t *tuple, cisparse_t *parse)
+{
+    int ret = CS_SUCCESS;
+    
+    if (tuple->TupleDataLen > tuple->TupleDataMax)
+        return CS_BAD_TUPLE;
+    switch (tuple->TupleCode) {
+    case CISTPL_DEVICE:
+    case CISTPL_DEVICE_A:
+        ret = parse_device(tuple, &parse->device);
+        break;
+#ifdef CONFIG_CARDBUS
+    case CISTPL_BAR:
+        ret = parse_bar(tuple, &parse->bar);
+        break;
+    case CISTPL_CONFIG_CB:
+        ret = parse_config_cb(tuple, &parse->config);
+        break;
+    case CISTPL_CFTABLE_ENTRY_CB:
+        ret = parse_cftable_entry_cb(tuple, &parse->cftable_entry_cb);
+        break;
+#endif
+    case CISTPL_CHECKSUM:
+        ret = parse_checksum(tuple, &parse->checksum);
+        break;
+    case CISTPL_LONGLINK_A:
+    case CISTPL_LONGLINK_C:
+        ret = parse_longlink(tuple, &parse->longlink);
+        break;
+    case CISTPL_LONGLINK_MFC:
+        ret = parse_longlink_mfc(tuple, &parse->longlink_mfc);
+        break;
+    case CISTPL_VERS_1:
+        ret = parse_vers_1(tuple, &parse->version_1);
+        break;
+    case CISTPL_ALTSTR:
+        ret = parse_altstr(tuple, &parse->altstr);
+        break;
+    case CISTPL_JEDEC_A:
+    case CISTPL_JEDEC_C:
+        ret = parse_jedec(tuple, &parse->jedec);
+        break;
+    case CISTPL_MANFID:
+        ret = parse_manfid(tuple, &parse->manfid);
+        break;
+    case CISTPL_FUNCID:
+        ret = parse_funcid(tuple, &parse->funcid);
+        break;
+    case CISTPL_FUNCE:
+        ret = parse_funce(tuple, &parse->funce);
+        break;
+    case CISTPL_CONFIG:
+        ret = parse_config(tuple, &parse->config);
+        break;
+    case CISTPL_CFTABLE_ENTRY:
+        ret = parse_cftable_entry(tuple, &parse->cftable_entry);
+        break;
+    case CISTPL_DEVICE_GEO:
+    case CISTPL_DEVICE_GEO_A:
+        ret = parse_device_geo(tuple, &parse->device_geo);
+        break;
+    case CISTPL_VERS_2:
+        ret = parse_vers_2(tuple, &parse->vers_2);
+        break;
+    case CISTPL_ORG:
+        ret = parse_org(tuple, &parse->org);
+        break;
+    case CISTPL_FORMAT:
+    case CISTPL_FORMAT_A:
+        ret = parse_format(tuple, &parse->format);
+        break;
+    case CISTPL_NO_LINK:
+    case CISTPL_LINKTARGET:
+        ret = CS_SUCCESS;
+        break;
+    default:
+        ret = CS_UNSUPPORTED_FUNCTION;
+        break;
+    }
+    return ret;
+}
+EXPORT_SYMBOL(pccard_parse_tuple);
+
+/*======================================================================
+
+    This is used internally by Card Services to look up CIS stuff.
+    
+======================================================================*/
+
+int pccard_read_tuple(struct pcmcia_socket *s, unsigned int function, cisdata_t code, void *parse)
+{
+    tuple_t tuple;
+    cisdata_t *buf;
+    int ret;
+
+    buf = kmalloc(256, GFP_KERNEL);
+    if (buf == NULL)
+        return CS_OUT_OF_RESOURCE;
+    tuple.DesiredTuple = code;
+    tuple.Attributes = TUPLE_RETURN_COMMON;
+    ret = pccard_get_first_tuple(s, function, &tuple);
+    if (ret != CS_SUCCESS) goto done;
+    tuple.TupleData = buf;
+    tuple.TupleOffset = 0;
+    tuple.TupleDataMax = 255;
+    ret = pccard_get_tuple_data(s, &tuple);
+    if (ret != CS_SUCCESS) goto done;
+    ret = pccard_parse_tuple(&tuple, parse);
+done:
+    kfree(buf);
+    return ret;
+}
+EXPORT_SYMBOL(pccard_read_tuple);
+
+/*======================================================================
+
+    This tries to determine if a card has a sensible CIS.  It returns
+    the number of tuples in the CIS, or 0 if the CIS looks bad.  The
+    checks include making sure several critical tuples are present and
+    valid; seeing if the total number of tuples is reasonable; and
+    looking for tuples that use reserved codes.
+    
+======================================================================*/
+
+int pccard_validate_cis(struct pcmcia_socket *s, unsigned int function, cisinfo_t *info)
+{
+    tuple_t *tuple;
+    cisparse_t *p;
+    int ret, reserved, dev_ok = 0, ident_ok = 0;
+
+    if (!s)
+        return CS_BAD_HANDLE;
+
+    tuple = kmalloc(sizeof(*tuple), GFP_KERNEL);
+    if (tuple == NULL)
+        return CS_OUT_OF_RESOURCE;
+    p = kmalloc(sizeof(*p), GFP_KERNEL);
+    if (p == NULL) {
+        kfree(tuple);
+        return CS_OUT_OF_RESOURCE;
+    }
+
+    info->Chains = reserved = 0;
+    tuple->DesiredTuple = RETURN_FIRST_TUPLE;
+    tuple->Attributes = TUPLE_RETURN_COMMON;
+    ret = pccard_get_first_tuple(s, function, tuple);
+    if (ret != CS_SUCCESS)
+        goto done;
+
+    /* First tuple should be DEVICE; we should really have either that
+       or a CFTABLE_ENTRY of some sort */
+    if ((tuple->TupleCode == CISTPL_DEVICE) ||
+        (pccard_read_tuple(s, function, CISTPL_CFTABLE_ENTRY, p) == CS_SUCCESS) ||
+        (pccard_read_tuple(s, function, CISTPL_CFTABLE_ENTRY_CB, p) == CS_SUCCESS))
+        dev_ok++;
+
+    /* All cards should have a MANFID tuple, and/or a VERS_1 or VERS_2
+       tuple, for card identification.  Certain old D-Link and Linksys
+       cards have only a broken VERS_2 tuple; hence the bogus test. */
+    if ((pccard_read_tuple(s, function, CISTPL_MANFID, p) == CS_SUCCESS) ||
+        (pccard_read_tuple(s, function, CISTPL_VERS_1, p) == CS_SUCCESS) ||
+        (pccard_read_tuple(s, function, CISTPL_VERS_2, p) != CS_NO_MORE_ITEMS))
+        ident_ok++;
+
+    if (!dev_ok && !ident_ok)
+        goto done;
+
+    for (info->Chains = 1; info->Chains < MAX_TUPLES; info->Chains++) {
+        ret = pccard_get_next_tuple(s, function, tuple);
+        if (ret != CS_SUCCESS) break;
+        if (((tuple->TupleCode > 0x23) && (tuple->TupleCode < 0x40)) ||
+            ((tuple->TupleCode > 0x47) && (tuple->TupleCode < 0x80)) ||
+            ((tuple->TupleCode > 0x90) && (tuple->TupleCode < 0xff)))
+            reserved++;
+    }
+    if ((info->Chains == MAX_TUPLES) || (reserved > 5) ||
+        ((!dev_ok || !ident_ok) && (info->Chains > 10)))
+        info->Chains = 0;
+
+done:
+    kfree(tuple);
+    kfree(p);
+    return CS_SUCCESS;
+}
+EXPORT_SYMBOL(pccard_validate_cis);