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ecard.c

/*
 *  linux/arch/arm26/kernel/ecard.c
 *
 *  Copyright 1995-2001 Russell King
 *  Copyright 2003 Ian Molton
 *
 * 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.
 *
 *  Find all installed expansion cards, and handle interrupts from them.
 *
 *  Created from information from Acorns RiscOS3 PRMs
 *  15-Jun-2003 IM      Modified from ARM32 (RiscPC capable) version
 *  10-Jan-1999   RMK   Run loaders in a simulated RISC OS environment.
 *  06-May-1997   RMK   Added blacklist for cards whose loader doesn't work.
 *  12-Sep-1997   RMK   Created new handling of interrupt enables/disables
 *                - cards can now register their own routine to control
 *                interrupts (recommended).
 *  29-Sep-1997   RMK   Expansion card interrupt hardware not being re-enabled
 *                on reset from Linux. (Caused cards not to respond
 *                under RiscOS without hard reset).
 *
 */
#define ECARD_C

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/reboot.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/proc_fs.h>
#include <linux/device.h>
#include <linux/init.h>

#include <asm/dma.h>
#include <asm/ecard.h>
#include <asm/hardware.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/mmu_context.h>
#include <asm/irqchip.h>
#include <asm/tlbflush.h>

enum req {
      req_readbytes,
      req_reset
};

struct ecard_request {
      enum req    req;
      ecard_t           *ec;
      unsigned int      address;
      unsigned int      length;
      unsigned int      use_loader;
      void        *buffer;
};

struct expcard_blacklist {
      unsigned short     manufacturer;
      unsigned short     product;
      const char  *type;
};

static ecard_t *cards;
static ecard_t *slot_to_expcard[MAX_ECARDS];
static unsigned int ectcr;

/* List of descriptions of cards which don't have an extended
 * identification, or chunk directories containing a description.
 */
static struct expcard_blacklist __initdata blacklist[] = {
      { MANU_ACORN, PROD_ACORN_ETHER1, "Acorn Ether1" }
};

asmlinkage extern int
ecard_loader_reset(volatile unsigned char *pa, loader_t loader);
asmlinkage extern int
ecard_loader_read(int off, volatile unsigned char *pa, loader_t loader);

static const struct ecard_id *
ecard_match_device(const struct ecard_id *ids, struct expansion_card *ec);

static inline unsigned short
ecard_getu16(unsigned char *v)
{
      return v[0] | v[1] << 8;
}

static inline signed long
ecard_gets24(unsigned char *v)
{
      return v[0] | v[1] << 8 | v[2] << 16 | ((v[2] & 0x80) ? 0xff000000 : 0);
}

static inline ecard_t *
slot_to_ecard(unsigned int slot)
{
      return slot < MAX_ECARDS ? slot_to_expcard[slot] : NULL;
}

/* ===================== Expansion card daemon ======================== */
/*
 * Since the loader programs on the expansion cards need to be run
 * in a specific environment, create a separate task with this
 * environment up, and pass requests to this task as and when we
 * need to.
 *
 * This should allow 99% of loaders to be called from Linux.
 *
 * From a security standpoint, we trust the card vendors.  This
 * may be a misplaced trust.
 */
#define BUS_ADDR(x) ((((unsigned long)(x)) << 2) + IO_BASE)
#define POD_INT_ADDR(x) ((volatile unsigned char *)\
                   ((BUS_ADDR((x)) - IO_BASE) + IO_START))

static inline void ecard_task_reset(struct ecard_request *req)
{
      struct expansion_card *ec = req->ec;
      if (ec->loader)
            ecard_loader_reset(POD_INT_ADDR(ec->podaddr), ec->loader);
}

static void
ecard_task_readbytes(struct ecard_request *req)
{
      unsigned char *buf = (unsigned char *)req->buffer;
      volatile unsigned char *base_addr =
            (volatile unsigned char *)POD_INT_ADDR(req->ec->podaddr);
      unsigned int len = req->length;
      unsigned int off = req->address;

      if (!req->use_loader || !req->ec->loader) {
            off *= 4;
            while (len--) {
                  *buf++ = base_addr[off];
                  off += 4;
            }
      } else {
            while(len--) {
                  /*
                   * The following is required by some
                   * expansion card loader programs.
                   */
                  *(unsigned long *)0x108 = 0;
                  *buf++ = ecard_loader_read(off++, base_addr,
                                       req->ec->loader);
            }
      }
}

static void ecard_do_request(struct ecard_request *req)
{
      switch (req->req) {
      case req_readbytes:
            ecard_task_readbytes(req);
            break;

      case req_reset:
            ecard_task_reset(req);
            break;
      }
}

/*
 * On 26-bit processors, we don't need the kcardd thread to access the
 * expansion card loaders.  We do it directly.
 */
#define ecard_call(req) ecard_do_request(req)

/* ======================= Mid-level card control ===================== */

static void
ecard_readbytes(void *addr, ecard_t *ec, int off, int len, int useld)
{
      struct ecard_request req;

      req.req           = req_readbytes;
      req.ec            = ec;
      req.address = off;
      req.length  = len;
      req.use_loader    = useld;
      req.buffer  = addr;

      ecard_call(&req);
}

int ecard_readchunk(struct in_chunk_dir *cd, ecard_t *ec, int id, int num)
{
      struct ex_chunk_dir excd;
      int index = 16;
      int useld = 0;

      if (!ec->cid.cd)
            return 0;

      while(1) {
            ecard_readbytes(&excd, ec, index, 8, useld);
            index += 8;
            if (c_id(&excd) == 0) {
                  if (!useld && ec->loader) {
                        useld = 1;
                        index = 0;
                        continue;
                  }
                  return 0;
            }
            if (c_id(&excd) == 0xf0) { /* link */
                  index = c_start(&excd);
                  continue;
            }
            if (c_id(&excd) == 0x80) { /* loader */
                  if (!ec->loader) {
                        ec->loader = (loader_t)kmalloc(c_len(&excd),
                                                 GFP_KERNEL);
                        if (ec->loader)
                              ecard_readbytes(ec->loader, ec,
                                          (int)c_start(&excd),
                                          c_len(&excd), useld);
                        else
                              return 0;
                  }
                  continue;
            }
            if (c_id(&excd) == id && num-- == 0)
                  break;
      }

      if (c_id(&excd) & 0x80) {
            switch (c_id(&excd) & 0x70) {
            case 0x70:
                  ecard_readbytes((unsigned char *)excd.d.string, ec,
                              (int)c_start(&excd), c_len(&excd),
                              useld);
                  break;
            case 0x00:
                  break;
            }
      }
      cd->start_offset = c_start(&excd);
      memcpy(cd->d.string, excd.d.string, 256);
      return 1;
}

/* ======================= Interrupt control ============================ */

static void ecard_def_irq_enable(ecard_t *ec, int irqnr)
{
}

static void ecard_def_irq_disable(ecard_t *ec, int irqnr)
{
}

static int ecard_def_irq_pending(ecard_t *ec)
{
      return !ec->irqmask || ec->irqaddr[0] & ec->irqmask;
}

static void ecard_def_fiq_enable(ecard_t *ec, int fiqnr)
{
      panic("ecard_def_fiq_enable called - impossible");
}

static void ecard_def_fiq_disable(ecard_t *ec, int fiqnr)
{
      panic("ecard_def_fiq_disable called - impossible");
}

static int ecard_def_fiq_pending(ecard_t *ec)
{
      return !ec->fiqmask || ec->fiqaddr[0] & ec->fiqmask;
}

static expansioncard_ops_t ecard_default_ops = {
      ecard_def_irq_enable,
      ecard_def_irq_disable,
      ecard_def_irq_pending,
      ecard_def_fiq_enable,
      ecard_def_fiq_disable,
      ecard_def_fiq_pending
};

/*
 * Enable and disable interrupts from expansion cards.
 * (interrupts are disabled for these functions).
 *
 * They are not meant to be called directly, but via enable/disable_irq.
 */
static void ecard_irq_unmask(unsigned int irqnr)
{
      ecard_t *ec = slot_to_ecard(irqnr - 32);

      if (ec) {
            if (!ec->ops)
                  ec->ops = &ecard_default_ops;

            if (ec->claimed && ec->ops->irqenable)
                  ec->ops->irqenable(ec, irqnr);
            else
                  printk(KERN_ERR "ecard: rejecting request to "
                        "enable IRQs for %d\n", irqnr);
      }
}

static void ecard_irq_mask(unsigned int irqnr)
{
      ecard_t *ec = slot_to_ecard(irqnr - 32);

      if (ec) {
            if (!ec->ops)
                  ec->ops = &ecard_default_ops;

            if (ec->ops && ec->ops->irqdisable)
                  ec->ops->irqdisable(ec, irqnr);
      }
}

static struct irqchip ecard_chip = {
      .ack  = ecard_irq_mask,
      .mask = ecard_irq_mask,
      .unmask = ecard_irq_unmask,
};

void ecard_enablefiq(unsigned int fiqnr)
{
      ecard_t *ec = slot_to_ecard(fiqnr);

      if (ec) {
            if (!ec->ops)
                  ec->ops = &ecard_default_ops;

            if (ec->claimed && ec->ops->fiqenable)
                  ec->ops->fiqenable(ec, fiqnr);
            else
                  printk(KERN_ERR "ecard: rejecting request to "
                        "enable FIQs for %d\n", fiqnr);
      }
}

void ecard_disablefiq(unsigned int fiqnr)
{
      ecard_t *ec = slot_to_ecard(fiqnr);

      if (ec) {
            if (!ec->ops)
                  ec->ops = &ecard_default_ops;

            if (ec->ops->fiqdisable)
                  ec->ops->fiqdisable(ec, fiqnr);
      }
}

static void
ecard_dump_irq_state(ecard_t *ec)
{
      printk("  %d: %sclaimed, ",
             ec->slot_no,
             ec->claimed ? "" : "not ");

      if (ec->ops && ec->ops->irqpending &&
          ec->ops != &ecard_default_ops)
            printk("irq %spending\n",
                   ec->ops->irqpending(ec) ? "" : "not ");
      else
            printk("irqaddr %p, mask = %02X, status = %02X\n",
                   ec->irqaddr, ec->irqmask, *ec->irqaddr);
}

static void ecard_check_lockup(struct irqdesc *desc)
{
      static int last, lockup;
      ecard_t *ec;

      /*
       * If the timer interrupt has not run since the last million
       * unrecognised expansion card interrupts, then there is
       * something seriously wrong.  Disable the expansion card
       * interrupts so at least we can continue.
       *
       * Maybe we ought to start a timer to re-enable them some time
       * later?
       */
      if (last == jiffies) {
            lockup += 1;
            if (lockup > 1000000) {
                  printk(KERN_ERR "\nInterrupt lockup detected - "
                         "disabling all expansion card interrupts\n");

                  desc->chip->mask(IRQ_EXPANSIONCARD);

                  printk("Expansion card IRQ state:\n");

                  for (ec = cards; ec; ec = ec->next)
                        ecard_dump_irq_state(ec);
            }
      } else
            lockup = 0;

      /*
       * If we did not recognise the source of this interrupt,
       * warn the user, but don't flood the user with these messages.
       */
      if (!last || time_after(jiffies, (unsigned long)(last + 5*HZ))) {
            last = jiffies;
            printk(KERN_WARNING "Unrecognised interrupt from backplane\n");
      }
}

static void
ecard_irq_handler(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs)
{
      ecard_t *ec;
      int called = 0;

      desc->chip->mask(irq);
      for (ec = cards; ec; ec = ec->next) {
            int pending;

            if (!ec->claimed || ec->irq == NO_IRQ)
                  continue;

            if (ec->ops && ec->ops->irqpending)
                  pending = ec->ops->irqpending(ec);
            else
                  pending = ecard_default_ops.irqpending(ec);

            if (pending) {
                  struct irqdesc *d = irq_desc + ec->irq;
                  d->handle(ec->irq, d, regs);
                  called ++;
            }
      }
      desc->chip->unmask(irq);

      if (called == 0)
            ecard_check_lockup(desc);
}

#define ecard_irqexp_handler NULL
#define ecard_probeirqhw() (0)

unsigned int ecard_address(ecard_t *ec, card_type_t type, card_speed_t speed)
{
      unsigned long address = 0;
      int slot = ec->slot_no;

      ectcr &= ~(1 << slot);

      switch (type) {
      case ECARD_MEMC:
            address = IO_EC_MEMC_BASE + (slot << 12);
            break;

      case ECARD_IOC:
            address = IO_EC_IOC_BASE + (slot << 12) + (speed << 17);
            break;

      default:
            break;
      }

      return address;
}

static int ecard_prints(char *buffer, ecard_t *ec)
{
      char *start = buffer;

      buffer += sprintf(buffer, "  %d: ", ec->slot_no);

      if (ec->cid.id == 0) {
            struct in_chunk_dir incd;

            buffer += sprintf(buffer, "[%04X:%04X] ",
                  ec->cid.manufacturer, ec->cid.product);

            if (!ec->card_desc && ec->cid.cd &&
                ecard_readchunk(&incd, ec, 0xf5, 0)) {
                  ec->card_desc = kmalloc(strlen(incd.d.string)+1, GFP_KERNEL);

                  if (ec->card_desc)
                        strcpy((char *)ec->card_desc, incd.d.string);
            }

            buffer += sprintf(buffer, "%s\n", ec->card_desc ? ec->card_desc : "*unknown*");
      } else
            buffer += sprintf(buffer, "Simple card %d\n", ec->cid.id);

      return buffer - start;
}

static int get_ecard_dev_info(char *buf, char **start, off_t pos, int count)
{
      ecard_t *ec = cards;
      off_t at = 0;
      int len, cnt;

      cnt = 0;
      while (ec && count > cnt) {
            len = ecard_prints(buf, ec);
            at += len;
            if (at >= pos) {
                  if (!*start) {
                        *start = buf + (pos - (at - len));
                        cnt = at - pos;
                  } else
                        cnt += len;
                  buf += len;
            }
            ec = ec->next;
      }
      return (count > cnt) ? cnt : count;
}

static struct proc_dir_entry *proc_bus_ecard_dir = NULL;

static void ecard_proc_init(void)
{
      proc_bus_ecard_dir = proc_mkdir("ecard", proc_bus);
      create_proc_info_entry("devices", 0, proc_bus_ecard_dir,
            get_ecard_dev_info);
}

#define ec_set_resource(ec,nr,st,sz,flg)              \
      do {                                      \
            (ec)->resource[nr].name = ec->dev.bus_id; \
            (ec)->resource[nr].start = st;                  \
            (ec)->resource[nr].end = (st) + (sz) - 1; \
            (ec)->resource[nr].flags = flg;                 \
      } while (0)

static void __init ecard_init_resources(struct expansion_card *ec)
{
      unsigned long base = PODSLOT_IOC0_BASE;
      unsigned int slot = ec->slot_no;
      int i;

      ec_set_resource(ec, ECARD_RES_MEMC,
                  PODSLOT_MEMC_BASE + (slot << 14),
                  PODSLOT_MEMC_SIZE, IORESOURCE_MEM);

      for (i = 0; i < ECARD_RES_IOCSYNC - ECARD_RES_IOCSLOW; i++) {
            ec_set_resource(ec, i + ECARD_RES_IOCSLOW,
                        base + (slot << 14) + (i << 19),
                        PODSLOT_IOC_SIZE, IORESOURCE_MEM);
      }

      for (i = 0; i < ECARD_NUM_RESOURCES; i++) {
            if (ec->resource[i].start &&
                request_resource(&iomem_resource, &ec->resource[i])) {
                  printk(KERN_ERR "%s: resource(s) not available\n",
                        ec->dev.bus_id);
                  ec->resource[i].end -= ec->resource[i].start;
                  ec->resource[i].start = 0;
            }
      }
}

static ssize_t ecard_show_irq(struct device *dev, struct device_attribute *attr, char *buf)
{
      struct expansion_card *ec = ECARD_DEV(dev);
      return sprintf(buf, "%u\n", ec->irq);
}

static ssize_t ecard_show_vendor(struct device *dev, struct device_attribute *attr, char *buf)
{
      struct expansion_card *ec = ECARD_DEV(dev);
      return sprintf(buf, "%u\n", ec->cid.manufacturer);
}

static ssize_t ecard_show_device(struct device *dev, struct device_attribute *attr, char *buf)
{
      struct expansion_card *ec = ECARD_DEV(dev);
      return sprintf(buf, "%u\n", ec->cid.product);
}

static ssize_t ecard_show_dma(struct device *dev, struct device_attribute *attr, char *buf)
{
      struct expansion_card *ec = ECARD_DEV(dev);
      return sprintf(buf, "%u\n", ec->dma);
}

static ssize_t ecard_show_resources(struct device *dev, struct device_attribute *attr, char *buf)
{
      struct expansion_card *ec = ECARD_DEV(dev);
      char *str = buf;
      int i;

      for (i = 0; i < ECARD_NUM_RESOURCES; i++)
            str += sprintf(str, "%08lx %08lx %08lx\n",
                        ec->resource[i].start,
                        ec->resource[i].end,
                        ec->resource[i].flags);

      return str - buf;
}

static DEVICE_ATTR(irq, S_IRUGO, ecard_show_irq, NULL);
static DEVICE_ATTR(vendor, S_IRUGO, ecard_show_vendor, NULL);
static DEVICE_ATTR(device, S_IRUGO, ecard_show_device, NULL);
static DEVICE_ATTR(dma, S_IRUGO, ecard_show_dma, NULL);
static DEVICE_ATTR(resource, S_IRUGO, ecard_show_resources, NULL);

/*
 * Probe for an expansion card.
 *
 * If bit 1 of the first byte of the card is set, then the
 * card does not exist.
 */
static int __init
ecard_probe(int slot, card_type_t type)
{
      ecard_t **ecp;
      ecard_t *ec;
      struct ex_ecid cid;
      int i, rc = -ENOMEM;

      ec = kmalloc(sizeof(ecard_t), GFP_KERNEL);
      if (!ec)
            goto nomem;

      memset(ec, 0, sizeof(ecard_t));

      ec->slot_no = slot;
      ec->type        = type;
      ec->irq           = NO_IRQ;
      ec->fiq           = NO_IRQ;
      ec->dma           = NO_DMA;
      ec->card_desc     = NULL;
      ec->ops           = &ecard_default_ops;

      rc = -ENODEV;
      if ((ec->podaddr = ecard_address(ec, type, ECARD_SYNC)) == 0)
            goto nodev;

      cid.r_zero = 1;
      ecard_readbytes(&cid, ec, 0, 16, 0);
      if (cid.r_zero)
            goto nodev;

      ec->cid.id  = cid.r_id;
      ec->cid.cd  = cid.r_cd;
      ec->cid.is  = cid.r_is;
      ec->cid.w   = cid.r_w;
      ec->cid.manufacturer = ecard_getu16(cid.r_manu);
      ec->cid.product = ecard_getu16(cid.r_prod);
      ec->cid.country = cid.r_country;
      ec->cid.irqmask = cid.r_irqmask;
      ec->cid.irqoff  = ecard_gets24(cid.r_irqoff);
      ec->cid.fiqmask = cid.r_fiqmask;
      ec->cid.fiqoff  = ecard_gets24(cid.r_fiqoff);
      ec->fiqaddr =
      ec->irqaddr = (unsigned char *)ioaddr(ec->podaddr);

      if (ec->cid.is) {
            ec->irqmask = ec->cid.irqmask;
            ec->irqaddr += ec->cid.irqoff;
            ec->fiqmask = ec->cid.fiqmask;
            ec->fiqaddr += ec->cid.fiqoff;
      } else {
            ec->irqmask = 1;
            ec->fiqmask = 4;
      }

      for (i = 0; i < sizeof(blacklist) / sizeof(*blacklist); i++)
            if (blacklist[i].manufacturer == ec->cid.manufacturer &&
                blacklist[i].product == ec->cid.product) {
                  ec->card_desc = blacklist[i].type;
                  break;
            }

      snprintf(ec->dev.bus_id, sizeof(ec->dev.bus_id), "ecard%d", slot);
      ec->dev.parent = NULL;
      ec->dev.bus    = &ecard_bus_type;
      ec->dev.dma_mask = &ec->dma_mask;
      ec->dma_mask = (u64)0xffffffff;

      ecard_init_resources(ec);

      /*
       * hook the interrupt handlers
       */
      ec->irq = 32 + slot;
      set_irq_chip(ec->irq, &ecard_chip);
      set_irq_handler(ec->irq, do_level_IRQ);
      set_irq_flags(ec->irq, IRQF_VALID);

      for (ecp = &cards; *ecp; ecp = &(*ecp)->next);

      *ecp = ec;
      slot_to_expcard[slot] = ec;

      device_register(&ec->dev);
      device_create_file(&ec->dev, &dev_attr_dma);
      device_create_file(&ec->dev, &dev_attr_irq);
      device_create_file(&ec->dev, &dev_attr_resource);
      device_create_file(&ec->dev, &dev_attr_vendor);
      device_create_file(&ec->dev, &dev_attr_device); 

      return 0;

nodev:
      kfree(ec);
nomem:
      return rc;
}

/*
 * Initialise the expansion card system.
 * Locate all hardware - interrupt management and
 * actual cards.
 */
static int __init ecard_init(void)
{
      int slot, irqhw;

      printk("Probing expansion cards\n");

      for (slot = 0; slot < MAX_ECARDS; slot ++) {
            ecard_probe(slot, ECARD_IOC);
      }

      irqhw = ecard_probeirqhw();

      set_irq_chained_handler(IRQ_EXPANSIONCARD,
                        irqhw ? ecard_irqexp_handler : ecard_irq_handler);

      ecard_proc_init();

      return 0;
}

subsys_initcall(ecard_init);

/*
 *    ECARD "bus"
 */
static const struct ecard_id *
ecard_match_device(const struct ecard_id *ids, struct expansion_card *ec)
{
      int i;

      for (i = 0; ids[i].manufacturer != 65535; i++)
            if (ec->cid.manufacturer == ids[i].manufacturer &&
                ec->cid.product == ids[i].product)
                  return ids + i;

      return NULL;
}

static int ecard_drv_probe(struct device *dev)
{
      struct expansion_card *ec = ECARD_DEV(dev);
      struct ecard_driver *drv = ECARD_DRV(dev->driver);
      const struct ecard_id *id;
      int ret;

      id = ecard_match_device(drv->id_table, ec);

      ecard_claim(ec);
      ret = drv->probe(ec, id);
      if (ret)
            ecard_release(ec);
      return ret;
}

static int ecard_drv_remove(struct device *dev)
{
      struct expansion_card *ec = ECARD_DEV(dev);
      struct ecard_driver *drv = ECARD_DRV(dev->driver);

      drv->remove(ec);
      ecard_release(ec);

      return 0;
}

/*
 * Before rebooting, we must make sure that the expansion card is in a
 * sensible state, so it can be re-detected.  This means that the first
 * page of the ROM must be visible.  We call the expansion cards reset
 * handler, if any.
 */
static void ecard_drv_shutdown(struct device *dev)
{
      struct expansion_card *ec = ECARD_DEV(dev);
      struct ecard_driver *drv = ECARD_DRV(dev->driver);
      struct ecard_request req;

      if (drv->shutdown)
            drv->shutdown(ec);
      ecard_release(ec);
      req.req = req_reset;
      req.ec = ec;
      ecard_call(&req);
}

int ecard_register_driver(struct ecard_driver *drv)
{
      drv->drv.bus = &ecard_bus_type;
      drv->drv.probe = ecard_drv_probe;
      drv->drv.remove = ecard_drv_remove;
      drv->drv.shutdown = ecard_drv_shutdown;

      return driver_register(&drv->drv);
}

void ecard_remove_driver(struct ecard_driver *drv)
{
      driver_unregister(&drv->drv);
}

static int ecard_match(struct device *_dev, struct device_driver *_drv)
{
      struct expansion_card *ec = ECARD_DEV(_dev);
      struct ecard_driver *drv = ECARD_DRV(_drv);
      int ret;

      if (drv->id_table) {
            ret = ecard_match_device(drv->id_table, ec) != NULL;
      } else {
            ret = ec->cid.id == drv->id;
      }

      return ret;
}

struct bus_type ecard_bus_type = {
      .name = "ecard",
      .match      = ecard_match,
};

static int ecard_bus_init(void)
{
      return bus_register(&ecard_bus_type);
}

postcore_initcall(ecard_bus_init);

EXPORT_SYMBOL(ecard_readchunk);
EXPORT_SYMBOL(ecard_address);
EXPORT_SYMBOL(ecard_register_driver);
EXPORT_SYMBOL(ecard_remove_driver);
EXPORT_SYMBOL(ecard_bus_type);

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