drivers/char/pcmcia/cm4040_cs.c - kernel/msm-4.19 - Gitiles

 /*
  * A driver for the Omnikey PCMCIA smartcard reader CardMan 4040
  *
  * (c) 2000-2004 Omnikey AG (http://www.omnikey.com/)
  *
  * (C) 2005-2006 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
  * 	- add class interface for udev device creation
  *
  * 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.
  */

 #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/mutex.h>
 #include <linux/wait.h>
 #include <linux/uaccess.h>
 #include <asm/io.h>

 #include <pcmcia/cistpl.h>
 #include <pcmcia/cisreg.h>
 #include <pcmcia/ciscode.h>
 #include <pcmcia/ds.h>

 #include "cm4040_cs.h"


 #define reader_to_dev(x)	(&x->p_dev->dev)

 /* n (debug level) is ignored */
 /* additional debug output may be enabled by re-compiling with
  * CM4040_DEBUG set */
 /* #define CM4040_DEBUG */
 #define DEBUGP(n, rdr, x, args...) do { 		\
 		dev_dbg(reader_to_dev(rdr), "%s:" x, 	\
 			   __func__ , ## args);		\
 	} while (0)

 static DEFINE_MUTEX(cm4040_mutex);

 #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(struct pcmcia_device *link);

 static int major;
 static struct class *cmx_class;

 #define		BS_READABLE	0x01
 #define		BS_WRITABLE	0x02

 struct reader_dev {
 	struct pcmcia_device	*p_dev;
 	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 struct pcmcia_device *dev_table[CM_MAX_DEV];

 #ifndef CM4040_DEBUG
 #define	xoutb	outb
 #define	xinb	inb
 #else
 static inline void xoutb(unsigned char val, unsigned short port)
 {
 	pr_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);
 	pr_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->p_dev->resource[0]->start
 				+ 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->p_dev->resource[0]->start;

 	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->p_dev->resource[0]->start;
 	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->p_dev->resource[0]->start;

 	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->p_dev->resource[0]->start;
 	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 (!pcmcia_dev_present(dev->p_dev))
 		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 CM4040_DEBUG
 		pr_debug("%lu:%2x ", i, dev->r_buf[i]);
 	}
 	pr_debug("\n");
 #else
 	}
 #endif

 	bytes_to_read = 5 + le32_to_cpu(*(__le32 *)&dev->r_buf[1]);

 	DEBUGP(6, dev, "BytesToRead=%zu\n", bytes_to_read);

 	min_bytes_to_read = min(count, bytes_to_read + 5);
 	min_bytes_to_read = min_t(size_t, min_bytes_to_read, READ_WRITE_BUFFER_SIZE);

 	DEBUGP(6, dev, "Min=%zu\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 CM4040_DEBUG
 		pr_debug("%lu:%2x ", i, dev->r_buf[i]);
 	}
 	pr_debug("\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->p_dev->resource[0]->start;
 	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) || (count > READ_WRITE_BUFFER_SIZE)) {
 		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 (!pcmcia_dev_present(dev->p_dev))
 		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;
 	struct pcmcia_device *link;
 	int minor = iminor(inode);
 	int ret;

 	if (minor >= CM_MAX_DEV)
 		return -ENODEV;

 	mutex_lock(&cm4040_mutex);
 	link = dev_table[minor];
 	if (link == NULL || !pcmcia_dev_present(link)) {
 		ret = -ENODEV;
 		goto out;
 	}

 	if (link->open) {
 		ret = -EBUSY;
 		goto out;
 	}

 	dev = link->priv;
 	filp->private_data = dev;

 	if (filp->f_flags & O_NONBLOCK) {
 		DEBUGP(4, dev, "filep->f_flags O_NONBLOCK set\n");
 		ret = -EAGAIN;
 		goto out;
 	}

 	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");
 	ret = nonseekable_open(inode, filp);
 out:
 	mutex_unlock(&cm4040_mutex);
 	return ret;
 }

 static int cm4040_close(struct inode *inode, struct file *filp)
 {
 	struct reader_dev *dev = filp->private_data;
 	struct pcmcia_device *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(struct pcmcia_device *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 int cm4040_config_check(struct pcmcia_device *p_dev, void *priv_data)
 {
 	return pcmcia_request_io(p_dev);
 }


 static int reader_config(struct pcmcia_device *link, int devno)
 {
 	struct reader_dev *dev;
 	int fail_rc;

 	link->config_flags |= CONF_AUTO_SET_IO;

 	if (pcmcia_loop_config(link, cm4040_config_check, NULL))
 		goto cs_release;

 	fail_rc = pcmcia_enable_device(link);
 	if (fail_rc != 0) {
 		dev_info(&link->dev, "pcmcia_enable_device failed 0x%x\n",
 			 fail_rc);
 		goto cs_release;
 	}

 	dev = link->priv;

 	DEBUGP(2, dev, "device " DEVICE_NAME "%d at %pR\n", devno,
 	      link->resource[0]);
 	DEBUGP(2, dev, "<- reader_config (succ)\n");

 	return 0;

 cs_release:
 	reader_release(link);
 	return -ENODEV;
 }

 static void reader_release(struct pcmcia_device *link)
 {
 	cm4040_reader_release(link);
 	pcmcia_disable_device(link);
 }

 static int reader_probe(struct pcmcia_device *link)
 {
 	struct reader_dev *dev;
 	int i, ret;

 	for (i = 0; i < CM_MAX_DEV; i++) {
 		if (dev_table[i] == NULL)
 			break;
 	}

 	if (i == CM_MAX_DEV)
 		return -ENODEV;

 	dev = kzalloc(sizeof(struct reader_dev), GFP_KERNEL);
 	if (dev == NULL)
 		return -ENOMEM;

 	dev->timeout = CCID_DRIVER_MINIMUM_TIMEOUT;
 	dev->buffer_status = 0;

 	link->priv = dev;
 	dev->p_dev = link;

 	dev_table[i] = link;

 	init_waitqueue_head(&dev->devq);
 	init_waitqueue_head(&dev->poll_wait);
 	init_waitqueue_head(&dev->read_wait);
 	init_waitqueue_head(&dev->write_wait);
 	setup_timer(&dev->poll_timer, cm4040_do_poll, 0);

 	ret = reader_config(link, i);
 	if (ret) {
 		dev_table[i] = NULL;
 		kfree(dev);
 		return ret;
 	}

 	device_create(cmx_class, NULL, MKDEV(major, i), NULL, "cmx%d", i);

 	return 0;
 }

 static void reader_detach(struct pcmcia_device *link)
 {
 	struct reader_dev *dev = link->priv;
 	int devno;

 	/* find device */
 	for (devno = 0; devno < CM_MAX_DEV; devno++) {
 		if (dev_table[devno] == link)
 			break;
 	}
 	if (devno == CM_MAX_DEV)
 		return;

 	reader_release(link);

 	dev_table[devno] = NULL;
 	kfree(dev);

 	device_destroy(cmx_class, MKDEV(major, devno));

 	return;
 }

 static const struct file_operations reader_fops = {
 	.owner		= THIS_MODULE,
 	.read		= cm4040_read,
 	.write		= cm4040_write,
 	.open		= cm4040_open,
 	.release	= cm4040_close,
 	.poll		= cm4040_poll,
 	.llseek		= no_llseek,
 };

 static const 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,
 	.name		= "cm4040_cs",
 	.probe		= reader_probe,
 	.remove		= reader_detach,
 	.id_table	= cm4040_ids,
 };

 static int __init cm4040_init(void)
 {
 	int rc;

 	cmx_class = class_create(THIS_MODULE, "cardman_4040");
 	if (IS_ERR(cmx_class))
 		return PTR_ERR(cmx_class);

 	major = register_chrdev(0, DEVICE_NAME, &reader_fops);
 	if (major < 0) {
 		printk(KERN_WARNING MODULE_NAME
 			": could not get major number\n");
 		class_destroy(cmx_class);
 		return major;
 	}

 	rc = pcmcia_register_driver(&reader_driver);
 	if (rc < 0) {
 		unregister_chrdev(major, DEVICE_NAME);
 		class_destroy(cmx_class);
 		return rc;
 	}

 	return 0;
 }

 static void __exit cm4040_exit(void)
 {
 	pcmcia_unregister_driver(&reader_driver);
 	unregister_chrdev(major, DEVICE_NAME);
 	class_destroy(cmx_class);
 }

 module_init(cm4040_init);
 module_exit(cm4040_exit);
 MODULE_LICENSE("Dual BSD/GPL");
	/*
	* A driver for the Omnikey PCMCIA smartcard reader CardMan 4040
	*
	* (c) 2000-2004 Omnikey AG (http://www.omnikey.com/)
	*
	* (C) 2005-2006 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
	* - add class interface for udev device creation
	*
	* 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.
	*/

	#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/mutex.h>
	#include <linux/wait.h>
	#include <linux/uaccess.h>
	#include <asm/io.h>

	#include <pcmcia/cistpl.h>
	#include <pcmcia/cisreg.h>
	#include <pcmcia/ciscode.h>
	#include <pcmcia/ds.h>

	#include "cm4040_cs.h"


	#define reader_to_dev(x) (&x->p_dev->dev)

	/* n (debug level) is ignored */
	/* additional debug output may be enabled by re-compiling with
	* CM4040_DEBUG set */
	/* #define CM4040_DEBUG */
	#define DEBUGP(n, rdr, x, args...) do { \
	dev_dbg(reader_to_dev(rdr), "%s:" x, \
	__func__ , ## args); \
	} while (0)

	static DEFINE_MUTEX(cm4040_mutex);

	#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(struct pcmcia_device *link);

	static int major;
	static struct class *cmx_class;

	#define BS_READABLE 0x01
	#define BS_WRITABLE 0x02

	struct reader_dev {
	struct pcmcia_device *p_dev;
	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 struct pcmcia_device *dev_table[CM_MAX_DEV];

	#ifndef CM4040_DEBUG
	#define xoutb outb
	#define xinb inb
	#else
	static inline void xoutb(unsigned char val, unsigned short port)
	{
	pr_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);
	pr_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->p_dev->resource[0]->start
	+ 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->p_dev->resource[0]->start;

	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->p_dev->resource[0]->start;
	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->p_dev->resource[0]->start;

	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->p_dev->resource[0]->start;
	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 (!pcmcia_dev_present(dev->p_dev))
	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 CM4040_DEBUG
	pr_debug("%lu:%2x ", i, dev->r_buf[i]);
	}
	pr_debug("\n");
	#else
	}
	#endif

	bytes_to_read = 5 + le32_to_cpu((__le32 )&dev->r_buf[1]);

	DEBUGP(6, dev, "BytesToRead=%zu\n", bytes_to_read);

	min_bytes_to_read = min(count, bytes_to_read + 5);
	min_bytes_to_read = min_t(size_t, min_bytes_to_read, READ_WRITE_BUFFER_SIZE);

	DEBUGP(6, dev, "Min=%zu\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 CM4040_DEBUG
	pr_debug("%lu:%2x ", i, dev->r_buf[i]);
	}
	pr_debug("\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->p_dev->resource[0]->start;
	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) \|\| (count > READ_WRITE_BUFFER_SIZE)) {
	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 (!pcmcia_dev_present(dev->p_dev))
	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;
	struct pcmcia_device *link;
	int minor = iminor(inode);
	int ret;

	if (minor >= CM_MAX_DEV)
	return -ENODEV;

	mutex_lock(&cm4040_mutex);
	link = dev_table[minor];
	if (link == NULL \|\| !pcmcia_dev_present(link)) {
	ret = -ENODEV;
	goto out;
	}

	if (link->open) {
	ret = -EBUSY;
	goto out;
	}

	dev = link->priv;
	filp->private_data = dev;

	if (filp->f_flags & O_NONBLOCK) {
	DEBUGP(4, dev, "filep->f_flags O_NONBLOCK set\n");
	ret = -EAGAIN;
	goto out;
	}

	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");
	ret = nonseekable_open(inode, filp);
	out:
	mutex_unlock(&cm4040_mutex);
	return ret;
	}

	static int cm4040_close(struct inode inode, struct file filp)
	{
	struct reader_dev *dev = filp->private_data;
	struct pcmcia_device *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(struct pcmcia_device *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 int cm4040_config_check(struct pcmcia_device p_dev, void priv_data)
	{
	return pcmcia_request_io(p_dev);
	}


	static int reader_config(struct pcmcia_device *link, int devno)
	{
	struct reader_dev *dev;
	int fail_rc;

	link->config_flags \|= CONF_AUTO_SET_IO;

	if (pcmcia_loop_config(link, cm4040_config_check, NULL))
	goto cs_release;

	fail_rc = pcmcia_enable_device(link);
	if (fail_rc != 0) {
	dev_info(&link->dev, "pcmcia_enable_device failed 0x%x\n",
	fail_rc);
	goto cs_release;
	}

	dev = link->priv;

	DEBUGP(2, dev, "device " DEVICE_NAME "%d at %pR\n", devno,
	link->resource[0]);
	DEBUGP(2, dev, "<- reader_config (succ)\n");

	return 0;

	cs_release:
	reader_release(link);
	return -ENODEV;
	}

	static void reader_release(struct pcmcia_device *link)
	{
	cm4040_reader_release(link);
	pcmcia_disable_device(link);
	}

	static int reader_probe(struct pcmcia_device *link)
	{
	struct reader_dev *dev;
	int i, ret;

	for (i = 0; i < CM_MAX_DEV; i++) {
	if (dev_table[i] == NULL)
	break;
	}

	if (i == CM_MAX_DEV)
	return -ENODEV;

	dev = kzalloc(sizeof(struct reader_dev), GFP_KERNEL);
	if (dev == NULL)
	return -ENOMEM;

	dev->timeout = CCID_DRIVER_MINIMUM_TIMEOUT;
	dev->buffer_status = 0;

	link->priv = dev;
	dev->p_dev = link;

	dev_table[i] = link;

	init_waitqueue_head(&dev->devq);
	init_waitqueue_head(&dev->poll_wait);
	init_waitqueue_head(&dev->read_wait);
	init_waitqueue_head(&dev->write_wait);
	setup_timer(&dev->poll_timer, cm4040_do_poll, 0);

	ret = reader_config(link, i);
	if (ret) {
	dev_table[i] = NULL;
	kfree(dev);
	return ret;
	}

	device_create(cmx_class, NULL, MKDEV(major, i), NULL, "cmx%d", i);

	return 0;
	}

	static void reader_detach(struct pcmcia_device *link)
	{
	struct reader_dev *dev = link->priv;
	int devno;

	/* find device */
	for (devno = 0; devno < CM_MAX_DEV; devno++) {
	if (dev_table[devno] == link)
	break;
	}
	if (devno == CM_MAX_DEV)
	return;

	reader_release(link);

	dev_table[devno] = NULL;
	kfree(dev);

	device_destroy(cmx_class, MKDEV(major, devno));

	return;
	}

	static const struct file_operations reader_fops = {
	.owner = THIS_MODULE,
	.read = cm4040_read,
	.write = cm4040_write,
	.open = cm4040_open,
	.release = cm4040_close,
	.poll = cm4040_poll,
	.llseek = no_llseek,
	};

	static const 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,
	.name = "cm4040_cs",
	.probe = reader_probe,
	.remove = reader_detach,
	.id_table = cm4040_ids,
	};

	static int __init cm4040_init(void)
	{
	int rc;

	cmx_class = class_create(THIS_MODULE, "cardman_4040");
	if (IS_ERR(cmx_class))
	return PTR_ERR(cmx_class);

	major = register_chrdev(0, DEVICE_NAME, &reader_fops);
	if (major < 0) {
	printk(KERN_WARNING MODULE_NAME
	": could not get major number\n");
	class_destroy(cmx_class);
	return major;
	}

	rc = pcmcia_register_driver(&reader_driver);
	if (rc < 0) {
	unregister_chrdev(major, DEVICE_NAME);
	class_destroy(cmx_class);
	return rc;
	}

	return 0;
	}

	static void __exit cm4040_exit(void)
	{
	pcmcia_unregister_driver(&reader_driver);
	unregister_chrdev(major, DEVICE_NAME);
	class_destroy(cmx_class);
	}

	module_init(cm4040_init);
	module_exit(cm4040_exit);
	MODULE_LICENSE("Dual BSD/GPL");