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ds.c

/*
 * ds.c -- 16-bit PCMCIA core support
 *
 * 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
 * (C) 2003 - 2006      Dominik Brodowski
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/list.h>
#include <linux/delay.h>
#include <linux/workqueue.h>
#include <linux/crc32.h>
#include <linux/firmware.h>
#include <linux/kref.h>
#include <linux/dma-mapping.h>

#define IN_CARD_SERVICES
#include <pcmcia/cs_types.h>
#include <pcmcia/cs.h>
#include <pcmcia/cistpl.h>
#include <pcmcia/ds.h>
#include <pcmcia/ss.h>

#include "cs_internal.h"
#include "ds_internal.h"

/*====================================================================*/

/* Module parameters */

MODULE_AUTHOR("David Hinds <dahinds@users.sourceforge.net>");
MODULE_DESCRIPTION("PCMCIA Driver Services");
MODULE_LICENSE("GPL");

#ifdef DEBUG
int ds_pc_debug;

module_param_named(pc_debug, ds_pc_debug, int, 0644);

#define ds_dbg(lvl, fmt, arg...) do {                       \
      if (ds_pc_debug > (lvl))                              \
            printk(KERN_DEBUG "ds: " fmt , ## arg);         \
} while (0)
#else
#define ds_dbg(lvl, fmt, arg...) do { } while (0)
#endif

spinlock_t pcmcia_dev_list_lock;

/*====================================================================*/

/* code which was in cs.c before */

/* String tables for error messages */

typedef struct lookup_t {
    int key;
    char *msg;
} lookup_t;

static const lookup_t error_table[] = {
    { CS_SUCCESS,       "Operation succeeded" },
    { CS_BAD_ADAPTER,         "Bad adapter" },
    { CS_BAD_ATTRIBUTE,       "Bad attribute", },
    { CS_BAD_BASE,            "Bad base address" },
    { CS_BAD_EDC,       "Bad EDC" },
    { CS_BAD_IRQ,       "Bad IRQ" },
    { CS_BAD_OFFSET,          "Bad offset" },
    { CS_BAD_PAGE,            "Bad page number" },
    { CS_READ_FAILURE,        "Read failure" },
    { CS_BAD_SIZE,            "Bad size" },
    { CS_BAD_SOCKET,          "Bad socket" },
    { CS_BAD_TYPE,            "Bad type" },
    { CS_BAD_VCC,       "Bad Vcc" },
    { CS_BAD_VPP,       "Bad Vpp" },
    { CS_BAD_WINDOW,          "Bad window" },
    { CS_WRITE_FAILURE,       "Write failure" },
    { CS_NO_CARD,       "No card present" },
    { CS_UNSUPPORTED_FUNCTION,      "Usupported function" },
    { CS_UNSUPPORTED_MODE,    "Unsupported mode" },
    { CS_BAD_SPEED,           "Bad speed" },
    { CS_BUSY,                "Resource busy" },
    { CS_GENERAL_FAILURE,     "General failure" },
    { CS_WRITE_PROTECTED,     "Write protected" },
    { CS_BAD_ARG_LENGTH,      "Bad argument length" },
    { CS_BAD_ARGS,            "Bad arguments" },
    { CS_CONFIGURATION_LOCKED,      "Configuration locked" },
    { CS_IN_USE,        "Resource in use" },
    { CS_NO_MORE_ITEMS,       "No more items" },
    { CS_OUT_OF_RESOURCE,     "Out of resource" },
    { CS_BAD_HANDLE,          "Bad handle" },
    { CS_BAD_TUPLE,           "Bad CIS tuple" }
};


static const lookup_t service_table[] = {
    { AccessConfigurationRegister,  "AccessConfigurationRegister" },
    { AddSocketServices,            "AddSocketServices" },
    { AdjustResourceInfo,           "AdjustResourceInfo" },
    { CheckEraseQueue,              "CheckEraseQueue" },
    { CloseMemory,                  "CloseMemory" },
    { DeregisterClient,             "DeregisterClient" },
    { DeregisterEraseQueue,         "DeregisterEraseQueue" },
    { GetCardServicesInfo,          "GetCardServicesInfo" },
    { GetClientInfo,                "GetClientInfo" },
    { GetConfigurationInfo,         "GetConfigurationInfo" },
    { GetEventMask,                 "GetEventMask" },
    { GetFirstClient,               "GetFirstClient" },
    { GetFirstRegion,               "GetFirstRegion" },
    { GetFirstTuple,                "GetFirstTuple" },
    { GetNextClient,                "GetNextClient" },
    { GetNextRegion,                "GetNextRegion" },
    { GetNextTuple,                 "GetNextTuple" },
    { GetStatus,              "GetStatus" },
    { GetTupleData,                 "GetTupleData" },
    { MapMemPage,             "MapMemPage" },
    { ModifyConfiguration,          "ModifyConfiguration" },
    { ModifyWindow,                 "ModifyWindow" },
    { OpenMemory,             "OpenMemory" },
    { ParseTuple,             "ParseTuple" },
    { ReadMemory,             "ReadMemory" },
    { RegisterClient,               "RegisterClient" },
    { RegisterEraseQueue,           "RegisterEraseQueue" },
    { RegisterMTD,                  "RegisterMTD" },
    { ReleaseConfiguration,         "ReleaseConfiguration" },
    { ReleaseIO,              "ReleaseIO" },
    { ReleaseIRQ,             "ReleaseIRQ" },
    { ReleaseWindow,                "ReleaseWindow" },
    { RequestConfiguration,         "RequestConfiguration" },
    { RequestIO,              "RequestIO" },
    { RequestIRQ,             "RequestIRQ" },
    { RequestSocketMask,            "RequestSocketMask" },
    { RequestWindow,                "RequestWindow" },
    { ResetCard,              "ResetCard" },
    { SetEventMask,                 "SetEventMask" },
    { ValidateCIS,                  "ValidateCIS" },
    { WriteMemory,                  "WriteMemory" },
    { BindDevice,             "BindDevice" },
    { BindMTD,                      "BindMTD" },
    { ReportError,                  "ReportError" },
    { SuspendCard,                  "SuspendCard" },
    { ResumeCard,             "ResumeCard" },
    { EjectCard,              "EjectCard" },
    { InsertCard,             "InsertCard" },
    { ReplaceCIS,             "ReplaceCIS" }
};


static int pcmcia_report_error(struct pcmcia_device *p_dev, error_info_t *err)
{
      int i;
      char *serv;

      if (!p_dev)
            printk(KERN_NOTICE);
      else
            printk(KERN_NOTICE "%s: ", p_dev->dev.bus_id);

      for (i = 0; i < ARRAY_SIZE(service_table); i++)
            if (service_table[i].key == err->func)
                  break;
      if (i < ARRAY_SIZE(service_table))
            serv = service_table[i].msg;
      else
            serv = "Unknown service number";

      for (i = 0; i < ARRAY_SIZE(error_table); i++)
            if (error_table[i].key == err->retcode)
                  break;
      if (i < ARRAY_SIZE(error_table))
            printk("%s: %s\n", serv, error_table[i].msg);
      else
            printk("%s: Unknown error code %#x\n", serv, err->retcode);

      return CS_SUCCESS;
} /* report_error */

/* end of code which was in cs.c before */

/*======================================================================*/

void cs_error(struct pcmcia_device *p_dev, int func, int ret)
{
      error_info_t err = { func, ret };
      pcmcia_report_error(p_dev, &err);
}
EXPORT_SYMBOL(cs_error);


static void pcmcia_check_driver(struct pcmcia_driver *p_drv)
{
      struct pcmcia_device_id *did = p_drv->id_table;
      unsigned int i;
      u32 hash;

      if (!p_drv->probe || !p_drv->remove)
            printk(KERN_DEBUG "pcmcia: %s lacks a requisite callback "
                   "function\n", p_drv->drv.name);

      while (did && did->match_flags) {
            for (i=0; i<4; i++) {
                  if (!did->prod_id[i])
                        continue;

                  hash = crc32(0, did->prod_id[i], strlen(did->prod_id[i]));
                  if (hash == did->prod_id_hash[i])
                        continue;

                  printk(KERN_DEBUG "pcmcia: %s: invalid hash for "
                         "product string \"%s\": is 0x%x, should "
                         "be 0x%x\n", p_drv->drv.name, did->prod_id[i],
                         did->prod_id_hash[i], hash);
                  printk(KERN_DEBUG "pcmcia: see "
                        "Documentation/pcmcia/devicetable.txt for "
                        "details\n");
            }
            did++;
      }

      return;
}


/*======================================================================*/


struct pcmcia_dynid {
      struct list_head        node;
      struct pcmcia_device_id       id;
};

/**
 * pcmcia_store_new_id - add a new PCMCIA device ID to this driver and re-probe devices
 * @driver: target device driver
 * @buf: buffer for scanning device ID data
 * @count: input size
 *
 * Adds a new dynamic PCMCIA device ID to this driver,
 * and causes the driver to probe for all devices again.
 */
static ssize_t
pcmcia_store_new_id(struct device_driver *driver, const char *buf, size_t count)
{
      struct pcmcia_dynid *dynid;
      struct pcmcia_driver *pdrv = to_pcmcia_drv(driver);
      __u16 match_flags, manf_id, card_id;
      __u8 func_id, function, device_no;
      __u32 prod_id_hash[4] = {0, 0, 0, 0};
      int fields=0;
      int retval = 0;

      fields = sscanf(buf, "%hx %hx %hx %hhx %hhx %hhx %x %x %x %x",
                  &match_flags, &manf_id, &card_id, &func_id, &function, &device_no,
                  &prod_id_hash[0], &prod_id_hash[1], &prod_id_hash[2], &prod_id_hash[3]);
      if (fields < 6)
            return -EINVAL;

      dynid = kzalloc(sizeof(struct pcmcia_dynid), GFP_KERNEL);
      if (!dynid)
            return -ENOMEM;

      INIT_LIST_HEAD(&dynid->node);
      dynid->id.match_flags = match_flags;
      dynid->id.manf_id = manf_id;
      dynid->id.card_id = card_id;
      dynid->id.func_id = func_id;
      dynid->id.function = function;
      dynid->id.device_no = device_no;
      memcpy(dynid->id.prod_id_hash, prod_id_hash, sizeof(__u32) * 4);

      spin_lock(&pdrv->dynids.lock);
      list_add_tail(&pdrv->dynids.list, &dynid->node);
      spin_unlock(&pdrv->dynids.lock);

      if (get_driver(&pdrv->drv)) {
            retval = driver_attach(&pdrv->drv);
            put_driver(&pdrv->drv);
      }

      if (retval)
            return retval;
      return count;
}
static DRIVER_ATTR(new_id, S_IWUSR, NULL, pcmcia_store_new_id);

static void
pcmcia_free_dynids(struct pcmcia_driver *drv)
{
      struct pcmcia_dynid *dynid, *n;

      spin_lock(&drv->dynids.lock);
      list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) {
            list_del(&dynid->node);
            kfree(dynid);
      }
      spin_unlock(&drv->dynids.lock);
}

static int
pcmcia_create_newid_file(struct pcmcia_driver *drv)
{
      int error = 0;
      if (drv->probe != NULL)
            error = sysfs_create_file(&drv->drv.kobj,
                                &driver_attr_new_id.attr);
      return error;
}


/**
 * pcmcia_register_driver - register a PCMCIA driver with the bus core
 * @driver: the &driver being registered
 *
 * Registers a PCMCIA driver with the PCMCIA bus core.
 */
int pcmcia_register_driver(struct pcmcia_driver *driver)
{
      int error;

      if (!driver)
            return -EINVAL;

      pcmcia_check_driver(driver);

      /* initialize common fields */
      driver->drv.bus = &pcmcia_bus_type;
      driver->drv.owner = driver->owner;
      spin_lock_init(&driver->dynids.lock);
      INIT_LIST_HEAD(&driver->dynids.list);

      ds_dbg(3, "registering driver %s\n", driver->drv.name);

      error = driver_register(&driver->drv);
      if (error < 0)
            return error;

      error = pcmcia_create_newid_file(driver);
      if (error)
            driver_unregister(&driver->drv);

      return error;
}
EXPORT_SYMBOL(pcmcia_register_driver);

/**
 * pcmcia_unregister_driver - unregister a PCMCIA driver with the bus core
 * @driver: the &driver being unregistered
 */
void pcmcia_unregister_driver(struct pcmcia_driver *driver)
{
      ds_dbg(3, "unregistering driver %s\n", driver->drv.name);
      driver_unregister(&driver->drv);
      pcmcia_free_dynids(driver);
}
EXPORT_SYMBOL(pcmcia_unregister_driver);


/* pcmcia_device handling */

struct pcmcia_device * pcmcia_get_dev(struct pcmcia_device *p_dev)
{
      struct device *tmp_dev;
      tmp_dev = get_device(&p_dev->dev);
      if (!tmp_dev)
            return NULL;
      return to_pcmcia_dev(tmp_dev);
}

void pcmcia_put_dev(struct pcmcia_device *p_dev)
{
      if (p_dev)
            put_device(&p_dev->dev);
}

static void pcmcia_release_function(struct kref *ref)
{
      struct config_t *c = container_of(ref, struct config_t, ref);
      ds_dbg(1, "releasing config_t\n");
      kfree(c);
}

static void pcmcia_release_dev(struct device *dev)
{
      struct pcmcia_device *p_dev = to_pcmcia_dev(dev);
      ds_dbg(1, "releasing device %s\n", p_dev->dev.bus_id);
      pcmcia_put_socket(p_dev->socket);
      kfree(p_dev->devname);
      kref_put(&p_dev->function_config->ref, pcmcia_release_function);
      kfree(p_dev);
}

static void pcmcia_add_device_later(struct pcmcia_socket *s, int mfc)
{
      if (!s->pcmcia_state.device_add_pending) {
            ds_dbg(1, "scheduling to add %s secondary"
                   " device to %d\n", mfc ? "mfc" : "pfc", s->sock);
            s->pcmcia_state.device_add_pending = 1;
            s->pcmcia_state.mfc_pfc = mfc;
            schedule_work(&s->device_add);
      }
      return;
}

static int pcmcia_device_probe(struct device * dev)
{
      struct pcmcia_device *p_dev;
      struct pcmcia_driver *p_drv;
      struct pcmcia_device_id *did;
      struct pcmcia_socket *s;
      cistpl_config_t cis_config;
      int ret = 0;

      dev = get_device(dev);
      if (!dev)
            return -ENODEV;

      p_dev = to_pcmcia_dev(dev);
      p_drv = to_pcmcia_drv(dev->driver);
      s = p_dev->socket;

      ds_dbg(1, "trying to bind %s to %s\n", p_dev->dev.bus_id,
             p_drv->drv.name);

      if ((!p_drv->probe) || (!p_dev->function_config) ||
          (!try_module_get(p_drv->owner))) {
            ret = -EINVAL;
            goto put_dev;
      }

      /* set up some more device information */
      ret = pccard_read_tuple(p_dev->socket, p_dev->func, CISTPL_CONFIG,
                        &cis_config);
      if (!ret) {
            p_dev->conf.ConfigBase = cis_config.base;
            p_dev->conf.Present = cis_config.rmask[0];
      } else {
            printk(KERN_INFO "pcmcia: could not parse base and rmask0 of CIS\n");
            p_dev->conf.ConfigBase = 0;
            p_dev->conf.Present = 0;
      }

      ret = p_drv->probe(p_dev);
      if (ret) {
            ds_dbg(1, "binding %s to %s failed with %d\n",
                   p_dev->dev.bus_id, p_drv->drv.name, ret);
            goto put_module;
      }

      /* handle pseudo multifunction devices:
       * there are at most two pseudo multifunction devices.
       * if we're matching against the first, schedule a
       * call which will then check whether there are two
       * pseudo devices, and if not, add the second one.
       */
      did = p_dev->dev.driver_data;
      if (did && (did->match_flags & PCMCIA_DEV_ID_MATCH_DEVICE_NO) &&
          (p_dev->socket->device_count == 1) && (p_dev->device_no == 0))
            pcmcia_add_device_later(p_dev->socket, 0);

 put_module:
      if (ret)
            module_put(p_drv->owner);
 put_dev:
      if (ret)
            put_device(dev);
      return (ret);
}


/*
 * Removes a PCMCIA card from the device tree and socket list.
 */
static void pcmcia_card_remove(struct pcmcia_socket *s, struct pcmcia_device *leftover)
{
      struct pcmcia_device    *p_dev;
      struct pcmcia_device    *tmp;
      unsigned long           flags;

      ds_dbg(2, "pcmcia_card_remove(%d) %s\n", s->sock,
             leftover ? leftover->devname : "");

      if (!leftover)
            s->device_count = 0;
      else
            s->device_count = 1;

      /* unregister all pcmcia_devices registered with this socket, except leftover */
      list_for_each_entry_safe(p_dev, tmp, &s->devices_list, socket_device_list) {
            if (p_dev == leftover)
                  continue;

            spin_lock_irqsave(&pcmcia_dev_list_lock, flags);
            list_del(&p_dev->socket_device_list);
            p_dev->_removed=1;
            spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);

            ds_dbg(2, "unregistering device %s\n", p_dev->dev.bus_id);
            device_unregister(&p_dev->dev);
      }

      return;
}

static int pcmcia_device_remove(struct device * dev)
{
      struct pcmcia_device *p_dev;
      struct pcmcia_driver *p_drv;
      struct pcmcia_device_id *did;
      int i;

      p_dev = to_pcmcia_dev(dev);
      p_drv = to_pcmcia_drv(dev->driver);

      ds_dbg(1, "removing device %s\n", p_dev->dev.bus_id);

      /* If we're removing the primary module driving a
       * pseudo multi-function card, we need to unbind
       * all devices
       */
      did = p_dev->dev.driver_data;
      if (did && (did->match_flags & PCMCIA_DEV_ID_MATCH_DEVICE_NO) &&
          (p_dev->socket->device_count != 0) &&
          (p_dev->device_no == 0))
            pcmcia_card_remove(p_dev->socket, p_dev);

      /* detach the "instance" */
      if (!p_drv)
            return 0;

      if (p_drv->remove)
                  p_drv->remove(p_dev);

      p_dev->dev_node = NULL;

      /* check for proper unloading */
      if (p_dev->_irq || p_dev->_io || p_dev->_locked)
            printk(KERN_INFO "pcmcia: driver %s did not release config properly\n",
                   p_drv->drv.name);

      for (i = 0; i < MAX_WIN; i++)
            if (p_dev->_win & CLIENT_WIN_REQ(i))
                  printk(KERN_INFO "pcmcia: driver %s did not release windows properly\n",
                         p_drv->drv.name);

      /* references from pcmcia_probe_device */
      pcmcia_put_dev(p_dev);
      module_put(p_drv->owner);

      return 0;
}


/*
 * pcmcia_device_query -- determine information about a pcmcia device
 */
static int pcmcia_device_query(struct pcmcia_device *p_dev)
{
      cistpl_manfid_t manf_id;
      cistpl_funcid_t func_id;
      cistpl_vers_1_t   *vers1;
      unsigned int i;

      vers1 = kmalloc(sizeof(*vers1), GFP_KERNEL);
      if (!vers1)
            return -ENOMEM;

      if (!pccard_read_tuple(p_dev->socket, p_dev->func,
                         CISTPL_MANFID, &manf_id)) {
            p_dev->manf_id = manf_id.manf;
            p_dev->card_id = manf_id.card;
            p_dev->has_manf_id = 1;
            p_dev->has_card_id = 1;
      }

      if (!pccard_read_tuple(p_dev->socket, p_dev->func,
                         CISTPL_FUNCID, &func_id)) {
            p_dev->func_id = func_id.func;
            p_dev->has_func_id = 1;
      } else {
            /* rule of thumb: cards with no FUNCID, but with
             * common memory device geometry information, are
             * probably memory cards (from pcmcia-cs) */
            cistpl_device_geo_t *devgeo;

            devgeo = kmalloc(sizeof(*devgeo), GFP_KERNEL);
            if (!devgeo) {
                  kfree(vers1);
                  return -ENOMEM;
            }
            if (!pccard_read_tuple(p_dev->socket, p_dev->func,
                              CISTPL_DEVICE_GEO, devgeo)) {
                  ds_dbg(0, "mem device geometry probably means "
                         "FUNCID_MEMORY\n");
                  p_dev->func_id = CISTPL_FUNCID_MEMORY;
                  p_dev->has_func_id = 1;
            }
            kfree(devgeo);
      }

      if (!pccard_read_tuple(p_dev->socket, p_dev->func, CISTPL_VERS_1,
                         vers1)) {
            for (i=0; i < vers1->ns; i++) {
                  char *tmp;
                  unsigned int length;

                  tmp = vers1->str + vers1->ofs[i];

                  length = strlen(tmp) + 1;
                  if ((length < 2) || (length > 255))
                        continue;

                  p_dev->prod_id[i] = kmalloc(sizeof(char) * length,
                                        GFP_KERNEL);
                  if (!p_dev->prod_id[i])
                        continue;

                  p_dev->prod_id[i] = strncpy(p_dev->prod_id[i],
                                        tmp, length);
            }
      }

      kfree(vers1);
      return 0;
}


/* device_add_lock is needed to avoid double registration by cardmgr and kernel.
 * Serializes pcmcia_device_add; will most likely be removed in future.
 *
 * While it has the caveat that adding new PCMCIA devices inside(!) device_register()
 * won't work, this doesn't matter much at the moment: the driver core doesn't
 * support it either.
 */
static DEFINE_MUTEX(device_add_lock);

struct pcmcia_device * pcmcia_device_add(struct pcmcia_socket *s, unsigned int function)
{
      struct pcmcia_device *p_dev, *tmp_dev;
      unsigned long flags;
      int bus_id_len;

      s = pcmcia_get_socket(s);
      if (!s)
            return NULL;

      mutex_lock(&device_add_lock);

      ds_dbg(3, "adding device to %d, function %d\n", s->sock, function);

      /* max of 4 devices per card */
      if (s->device_count == 4)
            goto err_put;

      p_dev = kzalloc(sizeof(struct pcmcia_device), GFP_KERNEL);
      if (!p_dev)
            goto err_put;

      p_dev->socket = s;
      p_dev->device_no = (s->device_count++);
      p_dev->func   = function;

      p_dev->dev.bus = &pcmcia_bus_type;
      p_dev->dev.parent = s->dev.parent;
      p_dev->dev.release = pcmcia_release_dev;
      /* by default don't allow DMA */
      p_dev->dma_mask = DMA_MASK_NONE;
      p_dev->dev.dma_mask = &p_dev->dma_mask;
      bus_id_len = sprintf (p_dev->dev.bus_id, "%d.%d", p_dev->socket->sock, p_dev->device_no);

      p_dev->devname = kmalloc(6 + bus_id_len + 1, GFP_KERNEL);
      if (!p_dev->devname)
            goto err_free;
      sprintf (p_dev->devname, "pcmcia%s", p_dev->dev.bus_id);
      ds_dbg(3, "devname is %s\n", p_dev->devname);

      spin_lock_irqsave(&pcmcia_dev_list_lock, flags);

      /*
       * p_dev->function_config must be the same for all card functions.
       * Note that this is serialized by the device_add_lock, so that
       * only one such struct will be created.
       */
        list_for_each_entry(tmp_dev, &s->devices_list, socket_device_list)
                if (p_dev->func == tmp_dev->func) {
                  p_dev->function_config = tmp_dev->function_config;
                  kref_get(&p_dev->function_config->ref);
            }

      /* Add to the list in pcmcia_bus_socket */
      list_add(&p_dev->socket_device_list, &s->devices_list);

      spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);

      if (!p_dev->function_config) {
            ds_dbg(3, "creating config_t for %s\n", p_dev->dev.bus_id);
            p_dev->function_config = kzalloc(sizeof(struct config_t),
                                     GFP_KERNEL);
            if (!p_dev->function_config)
                  goto err_unreg;
            kref_init(&p_dev->function_config->ref);
      }

      printk(KERN_NOTICE "pcmcia: registering new device %s\n",
             p_dev->devname);

      pcmcia_device_query(p_dev);

      if (device_register(&p_dev->dev))
            goto err_unreg;

      mutex_unlock(&device_add_lock);

      return p_dev;

 err_unreg:
      spin_lock_irqsave(&pcmcia_dev_list_lock, flags);
      list_del(&p_dev->socket_device_list);
      spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);

 err_free:
      kfree(p_dev->devname);
      kfree(p_dev);
      s->device_count--;
 err_put:
      mutex_unlock(&device_add_lock);
      pcmcia_put_socket(s);

      return NULL;
}


static int pcmcia_card_add(struct pcmcia_socket *s)
{
      cisinfo_t cisinfo;
      cistpl_longlink_mfc_t mfc;
      unsigned int no_funcs, i;
      int ret = 0;

      if (!(s->resource_setup_done)) {
            ds_dbg(3, "no resources available, delaying card_add\n");
            return -EAGAIN; /* try again, but later... */
      }

      if (pcmcia_validate_mem(s)) {
            ds_dbg(3, "validating mem resources failed, "
                   "delaying card_add\n");
            return -EAGAIN; /* try again, but later... */
      }

      ret = pccard_validate_cis(s, BIND_FN_ALL, &cisinfo);
      if (ret || !cisinfo.Chains) {
            ds_dbg(0, "invalid CIS or invalid resources\n");
            return -ENODEV;
      }

      if (!pccard_read_tuple(s, BIND_FN_ALL, CISTPL_LONGLINK_MFC, &mfc))
            no_funcs = mfc.nfn;
      else
            no_funcs = 1;
      s->functions = no_funcs;

      for (i=0; i < no_funcs; i++)
            pcmcia_device_add(s, i);

      return (ret);
}


static void pcmcia_delayed_add_device(struct work_struct *work)
{
      struct pcmcia_socket *s =
            container_of(work, struct pcmcia_socket, device_add);
      ds_dbg(1, "adding additional device to %d\n", s->sock);
      pcmcia_device_add(s, s->pcmcia_state.mfc_pfc);
      s->pcmcia_state.device_add_pending = 0;
      s->pcmcia_state.mfc_pfc = 0;
}

static int pcmcia_requery(struct device *dev, void * _data)
{
      struct pcmcia_device *p_dev = to_pcmcia_dev(dev);
      if (!p_dev->dev.driver) {
            ds_dbg(1, "update device information for %s\n",
                   p_dev->dev.bus_id);
            pcmcia_device_query(p_dev);
      }

      return 0;
}

static void pcmcia_bus_rescan(struct pcmcia_socket *skt, int new_cis)
{
      int no_devices = 0;
      int ret = 0;
      unsigned long flags;

      /* must be called with skt_mutex held */
      ds_dbg(0, "re-scanning socket %d\n", skt->sock);

      spin_lock_irqsave(&pcmcia_dev_list_lock, flags);
      if (list_empty(&skt->devices_list))
            no_devices = 1;
      spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);

      /* If this is because of a CIS override, start over */
      if (new_cis && !no_devices)
            pcmcia_card_remove(skt, NULL);

      /* if no devices were added for this socket yet because of
       * missing resource information or other trouble, we need to
       * do this now. */
      if (no_devices || new_cis) {
            ret = pcmcia_card_add(skt);
            if (ret)
                  return;
      }

      /* some device information might have changed because of a CIS
       * update or because we can finally read it correctly... so
       * determine it again, overwriting old values if necessary. */
      bus_for_each_dev(&pcmcia_bus_type, NULL, NULL, pcmcia_requery);

      /* we re-scan all devices, not just the ones connected to this
       * socket. This does not matter, though. */
      ret = bus_rescan_devices(&pcmcia_bus_type);
      if (ret)
            printk(KERN_INFO "pcmcia: bus_rescan_devices failed\n");
}

#ifdef CONFIG_PCMCIA_LOAD_CIS

/**
 * pcmcia_load_firmware - load CIS from userspace if device-provided is broken
 * @dev: the pcmcia device which needs a CIS override
 * @filename: requested filename in /lib/firmware/
 *
 * This uses the in-kernel firmware loading mechanism to use a "fake CIS" if
 * the one provided by the card is broken. The firmware files reside in
 * /lib/firmware/ in userspace.
 */
static int pcmcia_load_firmware(struct pcmcia_device *dev, char * filename)
{
      struct pcmcia_socket *s = dev->socket;
      const struct firmware *fw;
      char path[20];
      int ret = -ENOMEM;
      int no_funcs;
      int old_funcs;
      cisdump_t *cis;
      cistpl_longlink_mfc_t mfc;

      if (!filename)
            return -EINVAL;

      ds_dbg(1, "trying to load CIS file %s\n", filename);

      if (strlen(filename) > 14) {
            printk(KERN_WARNING "pcmcia: CIS filename is too long\n");
            return -EINVAL;
      }

      snprintf(path, 20, "%s", filename);

      if (request_firmware(&fw, path, &dev->dev) == 0) {
            if (fw->size >= CISTPL_MAX_CIS_SIZE) {
                  ret = -EINVAL;
                  printk(KERN_ERR "pcmcia: CIS override is too big\n");
                  goto release;
            }

            cis = kzalloc(sizeof(cisdump_t), GFP_KERNEL);
            if (!cis) {
                  ret = -ENOMEM;
                  goto release;
            }

            cis->Length = fw->size + 1;
            memcpy(cis->Data, fw->data, fw->size);

            if (!pcmcia_replace_cis(s, cis))
                  ret = 0;
            else {
                  printk(KERN_ERR "pcmcia: CIS override failed\n");
                  goto release;
            }


            /* update information */
            pcmcia_device_query(dev);

            /* does this cis override add or remove functions? */
            old_funcs = s->functions;

            if (!pccard_read_tuple(s, BIND_FN_ALL, CISTPL_LONGLINK_MFC, &mfc))
                  no_funcs = mfc.nfn;
            else
                  no_funcs = 1;
            s->functions = no_funcs;

            if (old_funcs > no_funcs)
                  pcmcia_card_remove(s, dev);
            else if (no_funcs > old_funcs)
                  pcmcia_add_device_later(s, 1);
      }
 release:
      release_firmware(fw);

      return (ret);
}

#else /* !CONFIG_PCMCIA_LOAD_CIS */

static inline int pcmcia_load_firmware(struct pcmcia_device *dev, char * filename)
{
      return -ENODEV;
}

#endif


static inline int pcmcia_devmatch(struct pcmcia_device *dev,
                          struct pcmcia_device_id *did)
{
      if (did->match_flags & PCMCIA_DEV_ID_MATCH_MANF_ID) {
            if ((!dev->has_manf_id) || (dev->manf_id != did->manf_id))
                  return 0;
      }

      if (did->match_flags & PCMCIA_DEV_ID_MATCH_CARD_ID) {
            if ((!dev->has_card_id) || (dev->card_id != did->card_id))
                  return 0;
      }

      if (did->match_flags & PCMCIA_DEV_ID_MATCH_FUNCTION) {
            if (dev->func != did->function)
                  return 0;
      }

      if (did->match_flags & PCMCIA_DEV_ID_MATCH_PROD_ID1) {
            if (!dev->prod_id[0])
                  return 0;
            if (strcmp(did->prod_id[0], dev->prod_id[0]))
                  return 0;
      }

      if (did->match_flags & PCMCIA_DEV_ID_MATCH_PROD_ID2) {
            if (!dev->prod_id[1])
                  return 0;
            if (strcmp(did->prod_id[1], dev->prod_id[1]))
                  return 0;
      }

      if (did->match_flags & PCMCIA_DEV_ID_MATCH_PROD_ID3) {
            if (!dev->prod_id[2])
                  return 0;
            if (strcmp(did->prod_id[2], dev->prod_id[2]))
                  return 0;
      }

      if (did->match_flags & PCMCIA_DEV_ID_MATCH_PROD_ID4) {
            if (!dev->prod_id[3])
                  return 0;
            if (strcmp(did->prod_id[3], dev->prod_id[3]))
                  return 0;
      }

      if (did->match_flags & PCMCIA_DEV_ID_MATCH_DEVICE_NO) {
            if (dev->device_no != did->device_no)
                  return 0;
      }

      if (did->match_flags & PCMCIA_DEV_ID_MATCH_FUNC_ID) {
            if ((!dev->has_func_id) || (dev->func_id != did->func_id))
                  return 0;

            /* if this is a pseudo-multi-function device,
             * we need explicit matches */
            if (did->match_flags & PCMCIA_DEV_ID_MATCH_DEVICE_NO)
                  return 0;
            if (dev->device_no)
                  return 0;

            /* also, FUNC_ID matching needs to be activated by userspace
             * after it has re-checked that there is no possible module
             * with a prod_id/manf_id/card_id match.
             */
            ds_dbg(0, "skipping FUNC_ID match for %s until userspace "
                   "interaction\n", dev->dev.bus_id);
            if (!dev->allow_func_id_match)
                  return 0;
      }

      if (did->match_flags & PCMCIA_DEV_ID_MATCH_FAKE_CIS) {
            ds_dbg(0, "device %s needs a fake CIS\n", dev->dev.bus_id);
            if (!dev->socket->fake_cis)
                  pcmcia_load_firmware(dev, did->cisfile);

            if (!dev->socket->fake_cis)
                  return 0;
      }

      if (did->match_flags & PCMCIA_DEV_ID_MATCH_ANONYMOUS) {
            int i;
            for (i=0; i<4; i++)
                  if (dev->prod_id[i])
                        return 0;
            if (dev->has_manf_id || dev->has_card_id || dev->has_func_id)
                  return 0;
      }

      dev->dev.driver_data = (void *) did;

      return 1;
}


static int pcmcia_bus_match(struct device * dev, struct device_driver * drv) {
      struct pcmcia_device * p_dev = to_pcmcia_dev(dev);
      struct pcmcia_driver * p_drv = to_pcmcia_drv(drv);
      struct pcmcia_device_id *did = p_drv->id_table;
      struct pcmcia_dynid *dynid;

      /* match dynamic devices first */
      spin_lock(&p_drv->dynids.lock);
      list_for_each_entry(dynid, &p_drv->dynids.list, node) {
            ds_dbg(3, "trying to match %s to %s\n", dev->bus_id,
                   drv->name);
            if (pcmcia_devmatch(p_dev, &dynid->id)) {
                  ds_dbg(0, "matched %s to %s\n", dev->bus_id,
                         drv->name);
                  spin_unlock(&p_drv->dynids.lock);
                  return 1;
            }
      }
      spin_unlock(&p_drv->dynids.lock);

#ifdef CONFIG_PCMCIA_IOCTL
      /* matching by cardmgr */
      if (p_dev->cardmgr == p_drv) {
            ds_dbg(0, "cardmgr matched %s to %s\n", dev->bus_id,
                   drv->name);
            return 1;
      }
#endif

      while (did && did->match_flags) {
            ds_dbg(3, "trying to match %s to %s\n", dev->bus_id,
                   drv->name);
            if (pcmcia_devmatch(p_dev, did)) {
                  ds_dbg(0, "matched %s to %s\n", dev->bus_id,
                         drv->name);
                  return 1;
            }
            did++;
      }

      return 0;
}

#ifdef CONFIG_HOTPLUG

static int pcmcia_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
{
      struct pcmcia_device *p_dev;
      int i;
      u32 hash[4] = { 0, 0, 0, 0};

      if (!dev)
            return -ENODEV;

      p_dev = to_pcmcia_dev(dev);

      /* calculate hashes */
      for (i=0; i<4; i++) {
            if (!p_dev->prod_id[i])
                  continue;
            hash[i] = crc32(0, p_dev->prod_id[i], strlen(p_dev->prod_id[i]));
      }

      if (add_uevent_var(env, "SOCKET_NO=%u", p_dev->socket->sock))
            return -ENOMEM;

      if (add_uevent_var(env, "DEVICE_NO=%02X", p_dev->device_no))
            return -ENOMEM;

      if (add_uevent_var(env, "MODALIAS=pcmcia:m%04Xc%04Xf%02Xfn%02Xpfn%02X"
                     "pa%08Xpb%08Xpc%08Xpd%08X",
                     p_dev->has_manf_id ? p_dev->manf_id : 0,
                     p_dev->has_card_id ? p_dev->card_id : 0,
                     p_dev->has_func_id ? p_dev->func_id : 0,
                     p_dev->func,
                     p_dev->device_no,
                     hash[0],
                     hash[1],
                     hash[2],
                     hash[3]))
            return -ENOMEM;

      return 0;
}

#else

static int pcmcia_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
{
      return -ENODEV;
}

#endif

/************************ runtime PM support ***************************/

static int pcmcia_dev_suspend(struct device *dev, pm_message_t state);
static int pcmcia_dev_resume(struct device *dev);

static int runtime_suspend(struct device *dev)
{
      int rc;

      down(&dev->sem);
      rc = pcmcia_dev_suspend(dev, PMSG_SUSPEND);
      up(&dev->sem);
      if (!rc)
            dev->power.power_state.event = PM_EVENT_SUSPEND;
      return rc;
}

static void runtime_resume(struct device *dev)
{
      int rc;

      down(&dev->sem);
      rc = pcmcia_dev_resume(dev);
      up(&dev->sem);
      if (!rc)
            dev->power.power_state.event = PM_EVENT_ON;
}

/************************ per-device sysfs output ***************************/

#define pcmcia_device_attr(field, test, format)                   \
static ssize_t field##_show (struct device *dev, struct device_attribute *attr, char *buf)            \
{                                                     \
      struct pcmcia_device *p_dev = to_pcmcia_dev(dev);           \
      return p_dev->test ? sprintf (buf, format, p_dev->field) : -ENODEV; \
}

#define pcmcia_device_stringattr(name, field)                           \
static ssize_t name##_show (struct device *dev, struct device_attribute *attr, char *buf)       \
{                                                     \
      struct pcmcia_device *p_dev = to_pcmcia_dev(dev);           \
      return p_dev->field ? sprintf (buf, "%s\n", p_dev->field) : -ENODEV; \
}

pcmcia_device_attr(func, socket, "0x%02x\n");
pcmcia_device_attr(func_id, has_func_id, "0x%02x\n");
pcmcia_device_attr(manf_id, has_manf_id, "0x%04x\n");
pcmcia_device_attr(card_id, has_card_id, "0x%04x\n");
pcmcia_device_stringattr(prod_id1, prod_id[0]);
pcmcia_device_stringattr(prod_id2, prod_id[1]);
pcmcia_device_stringattr(prod_id3, prod_id[2]);
pcmcia_device_stringattr(prod_id4, prod_id[3]);


static ssize_t pcmcia_show_pm_state(struct device *dev, struct device_attribute *attr, char *buf)
{
      struct pcmcia_device *p_dev = to_pcmcia_dev(dev);

      if (p_dev->suspended)
            return sprintf(buf, "off\n");
      else
            return sprintf(buf, "on\n");
}

static ssize_t pcmcia_store_pm_state(struct device *dev, struct device_attribute *attr,
                             const char *buf, size_t count)
{
      struct pcmcia_device *p_dev = to_pcmcia_dev(dev);
      int ret = 0;

        if (!count)
                return -EINVAL;

      if ((!p_dev->suspended) && !strncmp(buf, "off", 3))
            ret = runtime_suspend(dev);
      else if (p_dev->suspended && !strncmp(buf, "on", 2))
            runtime_resume(dev);

      return ret ? ret : count;
}


static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
{
      struct pcmcia_device *p_dev = to_pcmcia_dev(dev);
      int i;
      u32 hash[4] = { 0, 0, 0, 0};

      /* calculate hashes */
      for (i=0; i<4; i++) {
            if (!p_dev->prod_id[i])
                  continue;
            hash[i] = crc32(0,p_dev->prod_id[i],strlen(p_dev->prod_id[i]));
      }
      return sprintf(buf, "pcmcia:m%04Xc%04Xf%02Xfn%02Xpfn%02X"
                        "pa%08Xpb%08Xpc%08Xpd%08X\n",
                        p_dev->has_manf_id ? p_dev->manf_id : 0,
                        p_dev->has_card_id ? p_dev->card_id : 0,
                        p_dev->has_func_id ? p_dev->func_id : 0,
                        p_dev->func, p_dev->device_no,
                        hash[0], hash[1], hash[2], hash[3]);
}

static ssize_t pcmcia_store_allow_func_id_match(struct device *dev,
            struct device_attribute *attr, const char *buf, size_t count)
{
      struct pcmcia_device *p_dev = to_pcmcia_dev(dev);
      int ret;

      if (!count)
            return -EINVAL;

      mutex_lock(&p_dev->socket->skt_mutex);
      p_dev->allow_func_id_match = 1;
      mutex_unlock(&p_dev->socket->skt_mutex);

      ret = bus_rescan_devices(&pcmcia_bus_type);
      if (ret)
            printk(KERN_INFO "pcmcia: bus_rescan_devices failed after "
                   "allowing func_id matches\n");

      return count;
}

static struct device_attribute pcmcia_dev_attrs[] = {
      __ATTR(function, 0444, func_show, NULL),
      __ATTR(pm_state, 0644, pcmcia_show_pm_state, pcmcia_store_pm_state),
      __ATTR_RO(func_id),
      __ATTR_RO(manf_id),
      __ATTR_RO(card_id),
      __ATTR_RO(prod_id1),
      __ATTR_RO(prod_id2),
      __ATTR_RO(prod_id3),
      __ATTR_RO(prod_id4),
      __ATTR_RO(modalias),
      __ATTR(allow_func_id_match, 0200, NULL, pcmcia_store_allow_func_id_match),
      __ATTR_NULL,
};

/* PM support, also needed for reset */

static int pcmcia_dev_suspend(struct device * dev, pm_message_t state)
{
      struct pcmcia_device *p_dev = to_pcmcia_dev(dev);
      struct pcmcia_driver *p_drv = NULL;
      int ret = 0;

      ds_dbg(2, "suspending %s\n", dev->bus_id);

      if (dev->driver)
            p_drv = to_pcmcia_drv(dev->driver);

      if (!p_drv)
            goto out;

      if (p_drv->suspend) {
            ret = p_drv->suspend(p_dev);
            if (ret) {
                  printk(KERN_ERR "pcmcia: device %s (driver %s) did "
                         "not want to go to sleep (%d)\n",
                         p_dev->devname, p_drv->drv.name, ret);
                  goto out;
            }
      }

      if (p_dev->device_no == p_dev->func) {
            ds_dbg(2, "releasing configuration for %s\n", dev->bus_id);
            pcmcia_release_configuration(p_dev);
      }

 out:
      if (!ret)
            p_dev->suspended = 1;
      return ret;
}


static int pcmcia_dev_resume(struct device * dev)
{
      struct pcmcia_device *p_dev = to_pcmcia_dev(dev);
        struct pcmcia_driver *p_drv = NULL;
      int ret = 0;

      ds_dbg(2, "resuming %s\n", dev->bus_id);

      if (dev->driver)
            p_drv = to_pcmcia_drv(dev->driver);

      if (!p_drv)
            goto out;

      if (p_dev->device_no == p_dev->func) {
            ds_dbg(2, "requesting configuration for %s\n", dev->bus_id);
            ret = pcmcia_request_configuration(p_dev, &p_dev->conf);
            if (ret)
                  goto out;
      }

      if (p_drv->resume)
            ret = p_drv->resume(p_dev);

 out:
      if (!ret)
            p_dev->suspended = 0;
      return ret;
}


static int pcmcia_bus_suspend_callback(struct device *dev, void * _data)
{
      struct pcmcia_socket *skt = _data;
      struct pcmcia_device *p_dev = to_pcmcia_dev(dev);

      if (p_dev->socket != skt || p_dev->suspended)
            return 0;

      return runtime_suspend(dev);
}

static int pcmcia_bus_resume_callback(struct device *dev, void * _data)
{
      struct pcmcia_socket *skt = _data;
      struct pcmcia_device *p_dev = to_pcmcia_dev(dev);

      if (p_dev->socket != skt || !p_dev->suspended)
            return 0;

      runtime_resume(dev);

      return 0;
}

static int pcmcia_bus_resume(struct pcmcia_socket *skt)
{
      ds_dbg(2, "resuming socket %d\n", skt->sock);
      bus_for_each_dev(&pcmcia_bus_type, NULL, skt, pcmcia_bus_resume_callback);
      return 0;
}

static int pcmcia_bus_suspend(struct pcmcia_socket *skt)
{
      ds_dbg(2, "suspending socket %d\n", skt->sock);
      if (bus_for_each_dev(&pcmcia_bus_type, NULL, skt,
                       pcmcia_bus_suspend_callback)) {
            pcmcia_bus_resume(skt);
            return -EIO;
      }
      return 0;
}


/*======================================================================

    The card status event handler.
    
======================================================================*/

/* Normally, the event is passed to individual drivers after
 * informing userspace. Only for CS_EVENT_CARD_REMOVAL this
 * is inversed to maintain historic compatibility.
 */

static int ds_event(struct pcmcia_socket *skt, event_t event, int priority)
{
      struct pcmcia_socket *s = pcmcia_get_socket(skt);

      if (!s) {
            printk(KERN_ERR "PCMCIA obtaining reference to socket %p " \
                  "failed, event 0x%x lost!\n", skt, event);
            return -ENODEV;
      }

      ds_dbg(1, "ds_event(0x%06x, %d, 0x%p)\n",
             event, priority, skt);

      switch (event) {
      case CS_EVENT_CARD_REMOVAL:
            s->pcmcia_state.present = 0;
            pcmcia_card_remove(skt, NULL);
            handle_event(skt, event);
            break;

      case CS_EVENT_CARD_INSERTION:
            s->pcmcia_state.present = 1;
            pcmcia_card_add(skt);
            handle_event(skt, event);
            break;

      case CS_EVENT_EJECTION_REQUEST:
            break;

      case CS_EVENT_PM_SUSPEND:
      case CS_EVENT_PM_RESUME:
      case CS_EVENT_RESET_PHYSICAL:
      case CS_EVENT_CARD_RESET:
      default:
            handle_event(skt, event);
            break;
    }

    pcmcia_put_socket(s);

    return 0;
} /* ds_event */


struct pcmcia_device * pcmcia_dev_present(struct pcmcia_device *_p_dev)
{
      struct pcmcia_device *p_dev;
      struct pcmcia_device *ret = NULL;

      p_dev = pcmcia_get_dev(_p_dev);
      if (!p_dev)
            return NULL;

      if (!p_dev->socket->pcmcia_state.present)
            goto out;

      if (p_dev->_removed)
            goto out;

      if (p_dev->suspended)
            goto out;

      ret = p_dev;
 out:
      pcmcia_put_dev(p_dev);
      return ret;
}
EXPORT_SYMBOL(pcmcia_dev_present);


static struct pcmcia_callback pcmcia_bus_callback = {
      .owner = THIS_MODULE,
      .event = ds_event,
      .requery = pcmcia_bus_rescan,
      .suspend = pcmcia_bus_suspend,
      .resume = pcmcia_bus_resume,
};

static int __devinit pcmcia_bus_add_socket(struct device *dev,
                                 struct class_interface *class_intf)
{
      struct pcmcia_socket *socket = dev_get_drvdata(dev);
      int ret;

      socket = pcmcia_get_socket(socket);
      if (!socket) {
            printk(KERN_ERR "PCMCIA obtaining reference to socket %p failed\n", socket);
            return -ENODEV;
      }

      /*
       * Ugly. But we want to wait for the socket threads to have started up.
       * We really should let the drivers themselves drive some of this..
       */
      msleep(250);

#ifdef CONFIG_PCMCIA_IOCTL
      init_waitqueue_head(&socket->queue);
#endif
      INIT_LIST_HEAD(&socket->devices_list);
      INIT_WORK(&socket->device_add, pcmcia_delayed_add_device);
      memset(&socket->pcmcia_state, 0, sizeof(u8));
      socket->device_count = 0;

      ret = pccard_register_pcmcia(socket, &pcmcia_bus_callback);
      if (ret) {
            printk(KERN_ERR "PCMCIA registration PCCard core failed for socket %p\n", socket);
            pcmcia_put_socket(socket);
            return (ret);
      }

      return 0;
}

static void pcmcia_bus_remove_socket(struct device *dev,
                             struct class_interface *class_intf)
{
      struct pcmcia_socket *socket = dev_get_drvdata(dev);

      if (!socket)
            return;

      socket->pcmcia_state.dead = 1;
      pccard_register_pcmcia(socket, NULL);

      /* unregister any unbound devices */
      mutex_lock(&socket->skt_mutex);
      pcmcia_card_remove(socket, NULL);
      mutex_unlock(&socket->skt_mutex);

      pcmcia_put_socket(socket);

      return;
}


/* the pcmcia_bus_interface is used to handle pcmcia socket devices */
static struct class_interface pcmcia_bus_interface = {
      .class = &pcmcia_socket_class,
      .add_dev = &pcmcia_bus_add_socket,
      .remove_dev = &pcmcia_bus_remove_socket,
};


struct bus_type pcmcia_bus_type = {
      .name = "pcmcia",
      .uevent = pcmcia_bus_uevent,
      .match = pcmcia_bus_match,
      .dev_attrs = pcmcia_dev_attrs,
      .probe = pcmcia_device_probe,
      .remove = pcmcia_device_remove,
      .suspend = pcmcia_dev_suspend,
      .resume = pcmcia_dev_resume,
};


static int __init init_pcmcia_bus(void)
{
      int ret;

      spin_lock_init(&pcmcia_dev_list_lock);

      ret = bus_register(&pcmcia_bus_type);
      if (ret < 0) {
            printk(KERN_WARNING "pcmcia: bus_register error: %d\n", ret);
            return ret;
      }
      ret = class_interface_register(&pcmcia_bus_interface);
      if (ret < 0) {
            printk(KERN_WARNING
                  "pcmcia: class_interface_register error: %d\n", ret);
            bus_unregister(&pcmcia_bus_type);
            return ret;
      }

      pcmcia_setup_ioctl();

      return 0;
}
fs_initcall(init_pcmcia_bus); /* one level after subsys_initcall so that 
                         * pcmcia_socket_class is already registered */


static void __exit exit_pcmcia_bus(void)
{
      pcmcia_cleanup_ioctl();

      class_interface_unregister(&pcmcia_bus_interface);

      bus_unregister(&pcmcia_bus_type);
}
module_exit(exit_pcmcia_bus);


MODULE_ALIAS("ds");

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