[PATCH] New Omnikey Cardman 4040 driver

Add new Omnikey Cardman 4040 smartcard reader driver

Signed-off-by: Harald Welte <laforge@gnumonks.org>
Cc: Dominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 841 insertions, 0 deletions

diff --git a/drivers/char/pcmcia/cm4040_cs.c b/drivers/char/pcmcia/cm4040_cs.c
new file mode 100644
index 000000000000..4c698d908ffa
--- /dev/null
+++ b/drivers/char/pcmcia/cm4040_cs.c
@@ -0,0 +1,841 @@
+/*
+ * A driver for the Omnikey PCMCIA smartcard reader CardMan 4040
+ *
+ * (c) 2000-2004 Omnikey AG (http://www.omnikey.com/)
+ *
+ * (C) 2005 Harald Welte <laforge@gnumonks.org>
+ *      - add support for poll()
+ *      - driver cleanup
+ *      - add waitqueues
+ *      - adhere to linux kernel coding style and policies
+ *      - support 2.6.13 "new style" pcmcia interface
+ *
+ * The device basically is a USB CCID compliant device that has been
+ * attached to an I/O-Mapped FIFO.
+ *
+ * All rights reserved, Dual BSD/GPL Licensed.
+ */
+
+/* #define PCMCIA_DEBUG 6 */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/fs.h>
+#include <linux/delay.h>
+#include <linux/poll.h>
+#include <linux/wait.h>
+#include <asm/uaccess.h>
+#include <asm/io.h>
+
+#include <pcmcia/cs_types.h>
+#include <pcmcia/cs.h>
+#include <pcmcia/cistpl.h>
+#include <pcmcia/cisreg.h>
+#include <pcmcia/ciscode.h>
+#include <pcmcia/ds.h>
+
+#include "cm4040_cs.h"
+
+
+#ifdef PCMCIA_DEBUG
+#define reader_to_dev(x)        (&handle_to_dev(x->link.handle))
+static int pc_debug = PCMCIA_DEBUG;
+module_param(pc_debug, int, 0600);
+#define DEBUGP(n, rdr, x, args...) do {                                 \
+        if (pc_debug >= (n))                                            \
+                dev_printk(KERN_DEBUG, reader_to_dev(rdr), "%s:" x,     \
+                           __FUNCTION__ , ##args);                      \
+        } while (0)
+#else
+#define DEBUGP(n, rdr, x, args...)
+#endif
+
+static char *version =
+"OMNIKEY CardMan 4040 v1.1.0gm4 - All bugs added by Harald Welte";
+
+#define CCID_DRIVER_BULK_DEFAULT_TIMEOUT        (150*HZ)
+#define CCID_DRIVER_ASYNC_POWERUP_TIMEOUT       (35*HZ)
+#define CCID_DRIVER_MINIMUM_TIMEOUT             (3*HZ)
+#define READ_WRITE_BUFFER_SIZE 512
+#define POLL_LOOP_COUNT                         1000
+
+/* how often to poll for fifo status change */
+#define POLL_PERIOD                             msecs_to_jiffies(10)
+
+static void reader_release(dev_link_t *link);
+static void reader_detach(dev_link_t *link);
+
+static int major;
+
+#define         BS_READABLE     0x01
+#define         BS_WRITABLE     0x02
+
+struct reader_dev {
+        dev_link_t              link;
+        dev_node_t              node;
+        wait_queue_head_t       devq;
+        wait_queue_head_t       poll_wait;
+        wait_queue_head_t       read_wait;
+        wait_queue_head_t       write_wait;
+        unsigned long           buffer_status;
+        unsigned long           timeout;
+        unsigned char           s_buf[READ_WRITE_BUFFER_SIZE];
+        unsigned char           r_buf[READ_WRITE_BUFFER_SIZE];
+        struct timer_list       poll_timer;
+};
+
+static dev_info_t dev_info = MODULE_NAME;
+static dev_link_t *dev_table[CM_MAX_DEV];
+
+#ifndef PCMCIA_DEBUG
+#define xoutb   outb
+#define xinb    inb
+#else
+static inline void xoutb(unsigned char val, unsigned short port)
+{
+        if (pc_debug >= 7)
+                printk(KERN_DEBUG "outb(val=%.2x,port=%.4x)\n", val, port);
+        outb(val, port);
+}
+
+static inline unsigned char xinb(unsigned short port)
+{
+        unsigned char val;
+
+        val = inb(port);
+        if (pc_debug >= 7)
+                printk(KERN_DEBUG "%.2x=inb(%.4x)\n", val, port);
+        return val;
+}
+#endif
+
+/* poll the device fifo status register.  not to be confused with
+ * the poll syscall. */
+static void cm4040_do_poll(unsigned long dummy)
+{
+        struct reader_dev *dev = (struct reader_dev *) dummy;
+        unsigned int obs = xinb(dev->link.io.BasePort1
+                                + REG_OFFSET_BUFFER_STATUS);
+
+        if ((obs & BSR_BULK_IN_FULL)) {
+                set_bit(BS_READABLE, &dev->buffer_status);
+                DEBUGP(4, dev, "waking up read_wait\n");
+                wake_up_interruptible(&dev->read_wait);
+        } else
+                clear_bit(BS_READABLE, &dev->buffer_status);
+
+        if (!(obs & BSR_BULK_OUT_FULL)) {
+                set_bit(BS_WRITABLE, &dev->buffer_status);
+                DEBUGP(4, dev, "waking up write_wait\n");
+                wake_up_interruptible(&dev->write_wait);
+        } else
+                clear_bit(BS_WRITABLE, &dev->buffer_status);
+
+        if (dev->buffer_status)
+                wake_up_interruptible(&dev->poll_wait);
+
+        mod_timer(&dev->poll_timer, jiffies + POLL_PERIOD);
+}
+
+static void cm4040_stop_poll(struct reader_dev *dev)
+{
+        del_timer_sync(&dev->poll_timer);
+}
+
+static int wait_for_bulk_out_ready(struct reader_dev *dev)
+{
+        int i, rc;
+        int iobase = dev->link.io.BasePort1;
+
+        for (i = 0; i < POLL_LOOP_COUNT; i++) {
+                if ((xinb(iobase + REG_OFFSET_BUFFER_STATUS)
+                    & BSR_BULK_OUT_FULL) == 0) {
+                        DEBUGP(4, dev, "BulkOut empty (i=%d)\n", i);
+                        return 1;
+                }
+        }
+
+        DEBUGP(4, dev, "wait_event_interruptible_timeout(timeout=%ld\n",
+                dev->timeout);
+        rc = wait_event_interruptible_timeout(dev->write_wait,
+                                              test_and_clear_bit(BS_WRITABLE,
+                                                       &dev->buffer_status),
+                                              dev->timeout);
+
+        if (rc > 0)
+                DEBUGP(4, dev, "woke up: BulkOut empty\n");
+        else if (rc == 0)
+                DEBUGP(4, dev, "woke up: BulkOut full, returning 0 :(\n");
+        else if (rc < 0)
+                DEBUGP(4, dev, "woke up: signal arrived\n");
+
+        return rc;
+}
+
+/* Write to Sync Control Register */
+static int write_sync_reg(unsigned char val, struct reader_dev *dev)
+{
+        int iobase = dev->link.io.BasePort1;
+        int rc;
+
+        rc = wait_for_bulk_out_ready(dev);
+        if (rc <= 0)
+                return rc;
+
+        xoutb(val, iobase + REG_OFFSET_SYNC_CONTROL);
+        rc = wait_for_bulk_out_ready(dev);
+        if (rc <= 0)
+                return rc;
+
+        return 1;
+}
+
+static int wait_for_bulk_in_ready(struct reader_dev *dev)
+{
+        int i, rc;
+        int iobase = dev->link.io.BasePort1;
+
+        for (i = 0; i < POLL_LOOP_COUNT; i++) {
+                if ((xinb(iobase + REG_OFFSET_BUFFER_STATUS)
+                    & BSR_BULK_IN_FULL) == BSR_BULK_IN_FULL) {
+                        DEBUGP(3, dev, "BulkIn full (i=%d)\n", i);
+                        return 1;
+                }
+        }
+
+        DEBUGP(4, dev, "wait_event_interruptible_timeout(timeout=%ld\n",
+                dev->timeout);
+        rc = wait_event_interruptible_timeout(dev->read_wait,
+                                              test_and_clear_bit(BS_READABLE,
+                                                        &dev->buffer_status),
+                                              dev->timeout);
+        if (rc > 0)
+                DEBUGP(4, dev, "woke up: BulkIn full\n");
+        else if (rc == 0)
+                DEBUGP(4, dev, "woke up: BulkIn not full, returning 0 :(\n");
+        else if (rc < 0)
+                DEBUGP(4, dev, "woke up: signal arrived\n");
+
+        return rc;
+}
+
+static ssize_t cm4040_read(struct file *filp, char __user *buf,
+                        size_t count, loff_t *ppos)
+{
+        struct reader_dev *dev = filp->private_data;
+        int iobase = dev->link.io.BasePort1;
+        size_t bytes_to_read;
+        unsigned long i;
+        size_t min_bytes_to_read;
+        int rc;
+        unsigned char uc;
+
+        DEBUGP(2, dev, "-> cm4040_read(%s,%d)\n", current->comm, current->pid);
+
+        if (count == 0)
+                return 0;
+
+        if (count < 10)
+                return -EFAULT;
+
+        if (filp->f_flags & O_NONBLOCK) {
+                DEBUGP(4, dev, "filep->f_flags O_NONBLOCK set\n");
+                DEBUGP(2, dev, "<- cm4040_read (failure)\n");
+                return -EAGAIN;
+        }
+
+        if ((dev->link.state & DEV_PRESENT)==0)
+                return -ENODEV;
+
+        for (i = 0; i < 5; i++) {
+                rc = wait_for_bulk_in_ready(dev);
+                if (rc <= 0) {
+                        DEBUGP(5, dev, "wait_for_bulk_in_ready rc=%.2x\n", rc);
+                        DEBUGP(2, dev, "<- cm4040_read (failed)\n");
+                        if (rc == -ERESTARTSYS)
+                                return rc;
+                        return -EIO;
+                }
+                dev->r_buf[i] = xinb(iobase + REG_OFFSET_BULK_IN);
+#ifdef PCMCIA_DEBUG
+                if (pc_debug >= 6)
+                        printk(KERN_DEBUG "%lu:%2x ", i, dev->r_buf[i]);
+        }
+        printk("\n");
+#else
+        }
+#endif
+
+        bytes_to_read = 5 + le32_to_cpu(*(__le32 *)&dev->r_buf[1]);
+
+        DEBUGP(6, dev, "BytesToRead=%lu\n", bytes_to_read);
+
+        min_bytes_to_read = min(count, bytes_to_read + 5);
+
+        DEBUGP(6, dev, "Min=%lu\n", min_bytes_to_read);
+
+        for (i = 0; i < (min_bytes_to_read-5); i++) {
+                rc = wait_for_bulk_in_ready(dev);
+                if (rc <= 0) {
+                        DEBUGP(5, dev, "wait_for_bulk_in_ready rc=%.2x\n", rc);
+                        DEBUGP(2, dev, "<- cm4040_read (failed)\n");
+                        if (rc == -ERESTARTSYS)
+                                return rc;
+                        return -EIO;
+                }
+                dev->r_buf[i+5] = xinb(iobase + REG_OFFSET_BULK_IN);
+#ifdef PCMCIA_DEBUG
+                if (pc_debug >= 6)
+                        printk(KERN_DEBUG "%lu:%2x ", i, dev->r_buf[i]);
+        }
+        printk("\n");
+#else
+        }
+#endif
+
+        *ppos = min_bytes_to_read;
+        if (copy_to_user(buf, dev->r_buf, min_bytes_to_read))
+                return -EFAULT;
+
+        rc = wait_for_bulk_in_ready(dev);
+        if (rc <= 0) {
+                DEBUGP(5, dev, "wait_for_bulk_in_ready rc=%.2x\n", rc);
+                DEBUGP(2, dev, "<- cm4040_read (failed)\n");
+                if (rc == -ERESTARTSYS)
+                        return rc;
+                return -EIO;
+        }
+
+        rc = write_sync_reg(SCR_READER_TO_HOST_DONE, dev);
+        if (rc <= 0) {
+                DEBUGP(5, dev, "write_sync_reg c=%.2x\n", rc);
+                DEBUGP(2, dev, "<- cm4040_read (failed)\n");
+                if (rc == -ERESTARTSYS)
+                        return rc;
+                else
+                        return -EIO;
+        }
+
+        uc = xinb(iobase + REG_OFFSET_BULK_IN);
+
+        DEBUGP(2, dev, "<- cm4040_read (successfully)\n");
+        return min_bytes_to_read;
+}
+
+static ssize_t cm4040_write(struct file *filp, const char __user *buf,
+                         size_t count, loff_t *ppos)
+{
+        struct reader_dev *dev = filp->private_data;
+        int iobase = dev->link.io.BasePort1;
+        ssize_t rc;
+        int i;
+        unsigned int bytes_to_write;
+
+        DEBUGP(2, dev, "-> cm4040_write(%s,%d)\n", current->comm, current->pid);
+
+        if (count == 0) {
+                DEBUGP(2, dev, "<- cm4040_write empty read (successfully)\n");
+                return 0;
+        }
+
+        if (count < 5) {
+                DEBUGP(2, dev, "<- cm4040_write buffersize=%Zd < 5\n", count);
+                return -EIO;
+        }
+
+        if (filp->f_flags & O_NONBLOCK) {
+                DEBUGP(4, dev, "filep->f_flags O_NONBLOCK set\n");
+                DEBUGP(4, dev, "<- cm4040_write (failure)\n");
+                return -EAGAIN;
+        }
+
+        if ((dev->link.state & DEV_PRESENT) == 0)
+                return -ENODEV;
+
+        bytes_to_write = count;
+        if (copy_from_user(dev->s_buf, buf, bytes_to_write))
+                return -EFAULT;
+
+        switch (dev->s_buf[0]) {
+                case CMD_PC_TO_RDR_XFRBLOCK:
+                case CMD_PC_TO_RDR_SECURE:
+                case CMD_PC_TO_RDR_TEST_SECURE:
+                case CMD_PC_TO_RDR_OK_SECURE:
+                        dev->timeout = CCID_DRIVER_BULK_DEFAULT_TIMEOUT;
+                        break;
+
+                case CMD_PC_TO_RDR_ICCPOWERON:
+                        dev->timeout = CCID_DRIVER_ASYNC_POWERUP_TIMEOUT;
+                        break;
+
+                case CMD_PC_TO_RDR_GETSLOTSTATUS:
+                case CMD_PC_TO_RDR_ICCPOWEROFF:
+                case CMD_PC_TO_RDR_GETPARAMETERS:
+                case CMD_PC_TO_RDR_RESETPARAMETERS:
+                case CMD_PC_TO_RDR_SETPARAMETERS:
+                case CMD_PC_TO_RDR_ESCAPE:
+                case CMD_PC_TO_RDR_ICCCLOCK:
+                default:
+                        dev->timeout = CCID_DRIVER_MINIMUM_TIMEOUT;
+                        break;
+        }
+
+        rc = write_sync_reg(SCR_HOST_TO_READER_START, dev);
+        if (rc <= 0) {
+                DEBUGP(5, dev, "write_sync_reg c=%.2Zx\n", rc);
+                DEBUGP(2, dev, "<- cm4040_write (failed)\n");
+                if (rc == -ERESTARTSYS)
+                        return rc;
+                else
+                        return -EIO;
+        }
+
+        DEBUGP(4, dev, "start \n");
+
+        for (i = 0; i < bytes_to_write; i++) {
+                rc = wait_for_bulk_out_ready(dev);
+                if (rc <= 0) {
+                        DEBUGP(5, dev, "wait_for_bulk_out_ready rc=%.2Zx\n",
+                               rc);
+                        DEBUGP(2, dev, "<- cm4040_write (failed)\n");
+                        if (rc == -ERESTARTSYS)
+                                return rc;
+                        else
+                                return -EIO;
+                }
+
+                xoutb(dev->s_buf[i],iobase + REG_OFFSET_BULK_OUT);
+        }
+        DEBUGP(4, dev, "end\n");
+
+        rc = write_sync_reg(SCR_HOST_TO_READER_DONE, dev);
+
+        if (rc <= 0) {
+                DEBUGP(5, dev, "write_sync_reg c=%.2Zx\n", rc);
+                DEBUGP(2, dev, "<- cm4040_write (failed)\n");
+                if (rc == -ERESTARTSYS)
+                        return rc;
+                else
+                        return -EIO;
+        }
+
+        DEBUGP(2, dev, "<- cm4040_write (successfully)\n");
+        return count;
+}
+
+static unsigned int cm4040_poll(struct file *filp, poll_table *wait)
+{
+        struct reader_dev *dev = filp->private_data;
+        unsigned int mask = 0;
+
+        poll_wait(filp, &dev->poll_wait, wait);
+
+        if (test_and_clear_bit(BS_READABLE, &dev->buffer_status))
+                mask |= POLLIN | POLLRDNORM;
+        if (test_and_clear_bit(BS_WRITABLE, &dev->buffer_status))
+                mask |= POLLOUT | POLLWRNORM;
+
+        DEBUGP(2, dev, "<- cm4040_poll(%u)\n", mask);
+
+        return mask;
+}
+
+static int cm4040_open(struct inode *inode, struct file *filp)
+{
+        struct reader_dev *dev;
+        dev_link_t *link;
+        int minor = iminor(inode);
+
+        if (minor >= CM_MAX_DEV)
+                return -ENODEV;
+
+        link = dev_table[minor];
+        if (link == NULL || !(DEV_OK(link)))
+                return -ENODEV;
+
+        if (link->open)
+                return -EBUSY;
+
+        dev = link->priv;
+        filp->private_data = dev;
+
+        if (filp->f_flags & O_NONBLOCK) {
+                DEBUGP(4, dev, "filep->f_flags O_NONBLOCK set\n");
+                return -EAGAIN;
+        }
+
+        link->open = 1;
+
+        dev->poll_timer.data = (unsigned long) dev;
+        mod_timer(&dev->poll_timer, jiffies + POLL_PERIOD);
+
+        DEBUGP(2, dev, "<- cm4040_open (successfully)\n");
+        return nonseekable_open(inode, filp);
+}
+
+static int cm4040_close(struct inode *inode, struct file *filp)
+{
+        struct reader_dev *dev = filp->private_data;
+        dev_link_t *link;
+        int minor = iminor(inode);
+
+        DEBUGP(2, dev, "-> cm4040_close(maj/min=%d.%d)\n", imajor(inode),
+              iminor(inode));
+
+        if (minor >= CM_MAX_DEV)
+                return -ENODEV;
+
+        link = dev_table[minor];
+        if (link == NULL)
+                return -ENODEV;
+
+        cm4040_stop_poll(dev);
+
+        link->open = 0;
+        wake_up(&dev->devq);
+
+        DEBUGP(2, dev, "<- cm4040_close\n");
+        return 0;
+}
+
+static void cm4040_reader_release(dev_link_t *link)
+{
+        struct reader_dev *dev = link->priv;
+
+        DEBUGP(3, dev, "-> cm4040_reader_release\n");
+        while (link->open) {
+                DEBUGP(3, dev, KERN_INFO MODULE_NAME ": delaying release "
+                       "until process has terminated\n");
+                wait_event(dev->devq, (link->open == 0));
+        }
+        DEBUGP(3, dev, "<- cm4040_reader_release\n");
+        return;
+}
+
+static void reader_config(dev_link_t *link, int devno)
+{
+        client_handle_t handle;
+        struct reader_dev *dev;
+        tuple_t tuple;
+        cisparse_t parse;
+        config_info_t conf;
+        u_char buf[64];
+        int fail_fn, fail_rc;
+        int rc;
+
+        handle = link->handle;
+
+        tuple.DesiredTuple = CISTPL_CONFIG;
+        tuple.Attributes = 0;
+        tuple.TupleData = buf;
+        tuple.TupleDataMax = sizeof(buf);
+        tuple.TupleOffset = 0;
+
+        if ((fail_rc = pcmcia_get_first_tuple(handle, &tuple)) != CS_SUCCESS) {
+                fail_fn = GetFirstTuple;
+                goto cs_failed;
+        }
+        if ((fail_rc = pcmcia_get_tuple_data(handle, &tuple)) != CS_SUCCESS) {
+                fail_fn = GetTupleData;
+                goto cs_failed;
+        }
+        if ((fail_rc = pcmcia_parse_tuple(handle, &tuple, &parse))
+                                                        != CS_SUCCESS) {
+                fail_fn = ParseTuple;
+                goto cs_failed;
+        }
+        if ((fail_rc = pcmcia_get_configuration_info(handle, &conf))
+                                                        != CS_SUCCESS) {
+                fail_fn = GetConfigurationInfo;
+                goto cs_failed;
+        }
+
+        link->state |= DEV_CONFIG;
+        link->conf.ConfigBase = parse.config.base;
+        link->conf.Present = parse.config.rmask[0];
+        link->conf.Vcc = conf.Vcc;
+
+        link->io.BasePort2 = 0;
+        link->io.NumPorts2 = 0;
+        link->io.Attributes2 = 0;
+        tuple.DesiredTuple = CISTPL_CFTABLE_ENTRY;
+        for (rc = pcmcia_get_first_tuple(handle, &tuple);
+             rc == CS_SUCCESS;
+             rc = pcmcia_get_next_tuple(handle, &tuple)) {
+                rc = pcmcia_get_tuple_data(handle, &tuple);
+                if (rc != CS_SUCCESS)
+                        continue;
+                rc = pcmcia_parse_tuple(handle, &tuple, &parse);
+                if (rc != CS_SUCCESS)
+                        continue;
+
+                link->conf.ConfigIndex = parse.cftable_entry.index;
+
+                if (!parse.cftable_entry.io.nwin)
+                        continue;
+
+                link->io.BasePort1 = parse.cftable_entry.io.win[0].base;
+                link->io.NumPorts1 = parse.cftable_entry.io.win[0].len;
+                link->io.Attributes1 = IO_DATA_PATH_WIDTH_AUTO;
+                if (!(parse.cftable_entry.io.flags & CISTPL_IO_8BIT))
+                        link->io.Attributes1 = IO_DATA_PATH_WIDTH_16;
+                if (!(parse.cftable_entry.io.flags & CISTPL_IO_16BIT))
+                        link->io.Attributes1 = IO_DATA_PATH_WIDTH_8;
+                link->io.IOAddrLines = parse.cftable_entry.io.flags
+                                                & CISTPL_IO_LINES_MASK;
+                rc = pcmcia_request_io(handle, &link->io);
+
+                dev_printk(KERN_INFO, &handle_to_dev(handle), "foo");
+                if (rc == CS_SUCCESS)
+                        break;
+                else
+                        dev_printk(KERN_INFO, &handle_to_dev(handle),
+                                   "pcmcia_request_io failed 0x%x\n", rc);
+        }
+        if (rc != CS_SUCCESS)
+                goto cs_release;
+
+        link->conf.IntType = 00000002;
+
+        if ((fail_rc = pcmcia_request_configuration(handle,&link->conf))
+                                                                !=CS_SUCCESS) {
+                fail_fn = RequestConfiguration;
+                dev_printk(KERN_INFO, &handle_to_dev(handle),
+                           "pcmcia_request_configuration failed 0x%x\n",
+                           fail_rc);
+                goto cs_release;
+        }
+
+        dev = link->priv;
+        sprintf(dev->node.dev_name, DEVICE_NAME "%d", devno);
+        dev->node.major = major;
+        dev->node.minor = devno;
+        dev->node.next = NULL;
+        link->dev = &dev->node;
+        link->state &= ~DEV_CONFIG_PENDING;
+
+        DEBUGP(2, dev, "device " DEVICE_NAME "%d at 0x%.4x-0x%.4x\n", devno,
+              link->io.BasePort1, link->io.BasePort1+link->io.NumPorts1);
+        DEBUGP(2, dev, "<- reader_config (succ)\n");
+
+        return;
+
+cs_failed:
+        cs_error(handle, fail_fn, fail_rc);
+cs_release:
+        reader_release(link);
+        link->state &= ~DEV_CONFIG_PENDING;
+}
+
+static int reader_event(event_t event, int priority,
+                        event_callback_args_t *args)
+{
+        dev_link_t *link;
+        struct reader_dev *dev;
+        int devno;
+
+        link = args->client_data;
+        dev = link->priv;
+        DEBUGP(3, dev, "-> reader_event\n");
+        for (devno = 0; devno < CM_MAX_DEV; devno++) {
+                if (dev_table[devno] == link)
+                        break;
+        }
+        if (devno == CM_MAX_DEV)
+                return CS_BAD_ADAPTER;
+
+        switch (event) {
+                case CS_EVENT_CARD_INSERTION:
+                        DEBUGP(5, dev, "CS_EVENT_CARD_INSERTION\n");
+                        link->state |= DEV_PRESENT | DEV_CONFIG_PENDING;
+                        reader_config(link, devno);
+                        break;
+                case CS_EVENT_CARD_REMOVAL:
+                        DEBUGP(5, dev, "CS_EVENT_CARD_REMOVAL\n");
+                        link->state &= ~DEV_PRESENT;
+                        break;
+                case CS_EVENT_PM_SUSPEND:
+                        DEBUGP(5, dev, "CS_EVENT_PM_SUSPEND "
+                              "(fall-through to CS_EVENT_RESET_PHYSICAL)\n");
+                        link->state |= DEV_SUSPEND;
+
+                case CS_EVENT_RESET_PHYSICAL:
+                        DEBUGP(5, dev, "CS_EVENT_RESET_PHYSICAL\n");
+                        if (link->state & DEV_CONFIG) {
+                                DEBUGP(5, dev, "ReleaseConfiguration\n");
+                                pcmcia_release_configuration(link->handle);
+                        }
+                        break;
+                case CS_EVENT_PM_RESUME:
+                        DEBUGP(5, dev, "CS_EVENT_PM_RESUME "
+                              "(fall-through to CS_EVENT_CARD_RESET)\n");
+                        link->state &= ~DEV_SUSPEND;
+
+                case CS_EVENT_CARD_RESET:
+                        DEBUGP(5, dev, "CS_EVENT_CARD_RESET\n");
+                        if ((link->state & DEV_CONFIG)) {
+                                DEBUGP(5, dev, "RequestConfiguration\n");
+                                pcmcia_request_configuration(link->handle,
+                                                             &link->conf);
+                        }
+                        break;
+                default:
+                        DEBUGP(5, dev, "reader_event: unknown event %.2x\n",
+                               event);
+                        break;
+        }
+        DEBUGP(3, dev, "<- reader_event\n");
+        return CS_SUCCESS;
+}
+
+static void reader_release(dev_link_t *link)
+{
+        cm4040_reader_release(link->priv);
+        pcmcia_release_configuration(link->handle);
+        pcmcia_release_io(link->handle, &link->io);
+}
+
+static dev_link_t *reader_attach(void)
+{
+        struct reader_dev *dev;
+        dev_link_t *link;
+        client_reg_t client_reg;
+        int i;
+
+        for (i = 0; i < CM_MAX_DEV; i++) {
+                if (dev_table[i] == NULL)
+                        break;
+        }
+
+        if (i == CM_MAX_DEV)
+                return NULL;
+
+        dev = kzalloc(sizeof(struct reader_dev), GFP_KERNEL);
+        if (dev == NULL)
+                return NULL;
+
+        dev->timeout = CCID_DRIVER_MINIMUM_TIMEOUT;
+        dev->buffer_status = 0;
+
+        link = &dev->link;
+        link->priv = dev;
+
+        link->conf.IntType = INT_MEMORY_AND_IO;
+        dev_table[i] = link;
+
+        client_reg.dev_info = &dev_info;
+        client_reg.Attributes = INFO_IO_CLIENT | INFO_CARD_SHARE;
+        client_reg.EventMask=
+                CS_EVENT_CARD_INSERTION | CS_EVENT_CARD_REMOVAL |
+                CS_EVENT_RESET_PHYSICAL | CS_EVENT_CARD_RESET |
+                CS_EVENT_PM_SUSPEND | CS_EVENT_PM_RESUME;
+        client_reg.Version = 0x0210;
+        client_reg.event_callback_args.client_data = link;
+        i = pcmcia_register_client(&link->handle, &client_reg);
+        if (i) {
+                cs_error(link->handle, RegisterClient, i);
+                reader_detach(link);
+                return NULL;
+        }
+        init_waitqueue_head(&dev->devq);
+        init_waitqueue_head(&dev->poll_wait);
+        init_waitqueue_head(&dev->read_wait);
+        init_waitqueue_head(&dev->write_wait);
+        init_timer(&dev->poll_timer);
+        dev->poll_timer.function = &cm4040_do_poll;
+
+        return link;
+}
+
+static void reader_detach_by_devno(int devno, dev_link_t *link)
+{
+        struct reader_dev *dev = link->priv;
+
+        if (link->state & DEV_CONFIG) {
+                DEBUGP(5, dev, "device still configured (try to release it)\n");
+                reader_release(link);
+        }
+
+        pcmcia_deregister_client(link->handle);
+        dev_table[devno] = NULL;
+        DEBUGP(5, dev, "freeing dev=%p\n", dev);
+        cm4040_stop_poll(dev);
+        kfree(dev);
+        return;
+}
+
+static void reader_detach(dev_link_t *link)
+{
+        int i;
+
+        /* find device */
+        for (i = 0; i < CM_MAX_DEV; i++) {
+                if (dev_table[i] == link)
+                        break;
+        }
+        if (i == CM_MAX_DEV)
+                return;
+
+        reader_detach_by_devno(i, link);
+        return;
+}
+
+static struct file_operations reader_fops = {
+        .owner          = THIS_MODULE,
+        .read           = cm4040_read,
+        .write          = cm4040_write,
+        .open           = cm4040_open,
+        .release        = cm4040_close,
+        .poll           = cm4040_poll,
+};
+
+static struct pcmcia_device_id cm4040_ids[] = {
+        PCMCIA_DEVICE_MANF_CARD(0x0223, 0x0200),
+        PCMCIA_DEVICE_PROD_ID12("OMNIKEY", "CardMan 4040",
+                                0xE32CDD8C, 0x8F23318B),
+        PCMCIA_DEVICE_NULL,
+};
+MODULE_DEVICE_TABLE(pcmcia, cm4040_ids);
+
+static struct pcmcia_driver reader_driver = {
+        .owner          = THIS_MODULE,
+        .drv            = {
+                .name   = "cm4040_cs",
+        },
+        .attach         = reader_attach,
+        .detach         = reader_detach,
+        .event          = reader_event,
+        .id_table       = cm4040_ids,
+};
+
+static int __init cm4040_init(void)
+{
+        printk(KERN_INFO "%s\n", version);
+        pcmcia_register_driver(&reader_driver);
+        major = register_chrdev(0, DEVICE_NAME, &reader_fops);
+        if (major < 0) {
+                printk(KERN_WARNING MODULE_NAME
+                        ": could not get major number\n");
+                return -1;
+        }
+        return 0;
+}
+
+static void __exit cm4040_exit(void)
+{
+        int i;
+
+        printk(KERN_INFO MODULE_NAME ": unloading\n");
+        pcmcia_unregister_driver(&reader_driver);
+        for (i = 0; i < CM_MAX_DEV; i++) {
+                if (dev_table[i])
+                        reader_detach_by_devno(i, dev_table[i]);
+        }
+        unregister_chrdev(major, DEVICE_NAME);
+}
+
+module_init(cm4040_init);
+module_exit(cm4040_exit);
+MODULE_LICENSE("Dual BSD/GPL");