Version:  2.0.40 2.2.26 2.4.37 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16

Linux/drivers/char/pcmcia/cm4040_cs.c

  1 /*
  2  * A driver for the Omnikey PCMCIA smartcard reader CardMan 4040
  3  *
  4  * (c) 2000-2004 Omnikey AG (http://www.omnikey.com/)
  5  *
  6  * (C) 2005-2006 Harald Welte <laforge@gnumonks.org>
  7  *      - add support for poll()
  8  *      - driver cleanup
  9  *      - add waitqueues
 10  *      - adhere to linux kernel coding style and policies
 11  *      - support 2.6.13 "new style" pcmcia interface
 12  *      - add class interface for udev device creation
 13  *
 14  * The device basically is a USB CCID compliant device that has been
 15  * attached to an I/O-Mapped FIFO.
 16  *
 17  * All rights reserved, Dual BSD/GPL Licensed.
 18  */
 19 
 20 #include <linux/kernel.h>
 21 #include <linux/module.h>
 22 #include <linux/slab.h>
 23 #include <linux/init.h>
 24 #include <linux/fs.h>
 25 #include <linux/delay.h>
 26 #include <linux/poll.h>
 27 #include <linux/mutex.h>
 28 #include <linux/wait.h>
 29 #include <asm/uaccess.h>
 30 #include <asm/io.h>
 31 
 32 #include <pcmcia/cistpl.h>
 33 #include <pcmcia/cisreg.h>
 34 #include <pcmcia/ciscode.h>
 35 #include <pcmcia/ds.h>
 36 
 37 #include "cm4040_cs.h"
 38 
 39 
 40 #define reader_to_dev(x)        (&x->p_dev->dev)
 41 
 42 /* n (debug level) is ignored */
 43 /* additional debug output may be enabled by re-compiling with
 44  * CM4040_DEBUG set */
 45 /* #define CM4040_DEBUG */
 46 #define DEBUGP(n, rdr, x, args...) do {                 \
 47                 dev_dbg(reader_to_dev(rdr), "%s:" x,    \
 48                            __func__ , ## args);         \
 49         } while (0)
 50 
 51 static DEFINE_MUTEX(cm4040_mutex);
 52 
 53 #define CCID_DRIVER_BULK_DEFAULT_TIMEOUT        (150*HZ)
 54 #define CCID_DRIVER_ASYNC_POWERUP_TIMEOUT       (35*HZ)
 55 #define CCID_DRIVER_MINIMUM_TIMEOUT             (3*HZ)
 56 #define READ_WRITE_BUFFER_SIZE 512
 57 #define POLL_LOOP_COUNT                         1000
 58 
 59 /* how often to poll for fifo status change */
 60 #define POLL_PERIOD                             msecs_to_jiffies(10)
 61 
 62 static void reader_release(struct pcmcia_device *link);
 63 
 64 static int major;
 65 static struct class *cmx_class;
 66 
 67 #define         BS_READABLE     0x01
 68 #define         BS_WRITABLE     0x02
 69 
 70 struct reader_dev {
 71         struct pcmcia_device    *p_dev;
 72         wait_queue_head_t       devq;
 73         wait_queue_head_t       poll_wait;
 74         wait_queue_head_t       read_wait;
 75         wait_queue_head_t       write_wait;
 76         unsigned long           buffer_status;
 77         unsigned long           timeout;
 78         unsigned char           s_buf[READ_WRITE_BUFFER_SIZE];
 79         unsigned char           r_buf[READ_WRITE_BUFFER_SIZE];
 80         struct timer_list       poll_timer;
 81 };
 82 
 83 static struct pcmcia_device *dev_table[CM_MAX_DEV];
 84 
 85 #ifndef CM4040_DEBUG
 86 #define xoutb   outb
 87 #define xinb    inb
 88 #else
 89 static inline void xoutb(unsigned char val, unsigned short port)
 90 {
 91         pr_debug("outb(val=%.2x,port=%.4x)\n", val, port);
 92         outb(val, port);
 93 }
 94 
 95 static inline unsigned char xinb(unsigned short port)
 96 {
 97         unsigned char val;
 98 
 99         val = inb(port);
100         pr_debug("%.2x=inb(%.4x)\n", val, port);
101         return val;
102 }
103 #endif
104 
105 /* poll the device fifo status register.  not to be confused with
106  * the poll syscall. */
107 static void cm4040_do_poll(unsigned long dummy)
108 {
109         struct reader_dev *dev = (struct reader_dev *) dummy;
110         unsigned int obs = xinb(dev->p_dev->resource[0]->start
111                                 + REG_OFFSET_BUFFER_STATUS);
112 
113         if ((obs & BSR_BULK_IN_FULL)) {
114                 set_bit(BS_READABLE, &dev->buffer_status);
115                 DEBUGP(4, dev, "waking up read_wait\n");
116                 wake_up_interruptible(&dev->read_wait);
117         } else
118                 clear_bit(BS_READABLE, &dev->buffer_status);
119 
120         if (!(obs & BSR_BULK_OUT_FULL)) {
121                 set_bit(BS_WRITABLE, &dev->buffer_status);
122                 DEBUGP(4, dev, "waking up write_wait\n");
123                 wake_up_interruptible(&dev->write_wait);
124         } else
125                 clear_bit(BS_WRITABLE, &dev->buffer_status);
126 
127         if (dev->buffer_status)
128                 wake_up_interruptible(&dev->poll_wait);
129 
130         mod_timer(&dev->poll_timer, jiffies + POLL_PERIOD);
131 }
132 
133 static void cm4040_stop_poll(struct reader_dev *dev)
134 {
135         del_timer_sync(&dev->poll_timer);
136 }
137 
138 static int wait_for_bulk_out_ready(struct reader_dev *dev)
139 {
140         int i, rc;
141         int iobase = dev->p_dev->resource[0]->start;
142 
143         for (i = 0; i < POLL_LOOP_COUNT; i++) {
144                 if ((xinb(iobase + REG_OFFSET_BUFFER_STATUS)
145                     & BSR_BULK_OUT_FULL) == 0) {
146                         DEBUGP(4, dev, "BulkOut empty (i=%d)\n", i);
147                         return 1;
148                 }
149         }
150 
151         DEBUGP(4, dev, "wait_event_interruptible_timeout(timeout=%ld\n",
152                 dev->timeout);
153         rc = wait_event_interruptible_timeout(dev->write_wait,
154                                               test_and_clear_bit(BS_WRITABLE,
155                                                        &dev->buffer_status),
156                                               dev->timeout);
157 
158         if (rc > 0)
159                 DEBUGP(4, dev, "woke up: BulkOut empty\n");
160         else if (rc == 0)
161                 DEBUGP(4, dev, "woke up: BulkOut full, returning 0 :(\n");
162         else if (rc < 0)
163                 DEBUGP(4, dev, "woke up: signal arrived\n");
164 
165         return rc;
166 }
167 
168 /* Write to Sync Control Register */
169 static int write_sync_reg(unsigned char val, struct reader_dev *dev)
170 {
171         int iobase = dev->p_dev->resource[0]->start;
172         int rc;
173 
174         rc = wait_for_bulk_out_ready(dev);
175         if (rc <= 0)
176                 return rc;
177 
178         xoutb(val, iobase + REG_OFFSET_SYNC_CONTROL);
179         rc = wait_for_bulk_out_ready(dev);
180         if (rc <= 0)
181                 return rc;
182 
183         return 1;
184 }
185 
186 static int wait_for_bulk_in_ready(struct reader_dev *dev)
187 {
188         int i, rc;
189         int iobase = dev->p_dev->resource[0]->start;
190 
191         for (i = 0; i < POLL_LOOP_COUNT; i++) {
192                 if ((xinb(iobase + REG_OFFSET_BUFFER_STATUS)
193                     & BSR_BULK_IN_FULL) == BSR_BULK_IN_FULL) {
194                         DEBUGP(3, dev, "BulkIn full (i=%d)\n", i);
195                         return 1;
196                 }
197         }
198 
199         DEBUGP(4, dev, "wait_event_interruptible_timeout(timeout=%ld\n",
200                 dev->timeout);
201         rc = wait_event_interruptible_timeout(dev->read_wait,
202                                               test_and_clear_bit(BS_READABLE,
203                                                         &dev->buffer_status),
204                                               dev->timeout);
205         if (rc > 0)
206                 DEBUGP(4, dev, "woke up: BulkIn full\n");
207         else if (rc == 0)
208                 DEBUGP(4, dev, "woke up: BulkIn not full, returning 0 :(\n");
209         else if (rc < 0)
210                 DEBUGP(4, dev, "woke up: signal arrived\n");
211 
212         return rc;
213 }
214 
215 static ssize_t cm4040_read(struct file *filp, char __user *buf,
216                         size_t count, loff_t *ppos)
217 {
218         struct reader_dev *dev = filp->private_data;
219         int iobase = dev->p_dev->resource[0]->start;
220         size_t bytes_to_read;
221         unsigned long i;
222         size_t min_bytes_to_read;
223         int rc;
224         unsigned char uc;
225 
226         DEBUGP(2, dev, "-> cm4040_read(%s,%d)\n", current->comm, current->pid);
227 
228         if (count == 0)
229                 return 0;
230 
231         if (count < 10)
232                 return -EFAULT;
233 
234         if (filp->f_flags & O_NONBLOCK) {
235                 DEBUGP(4, dev, "filep->f_flags O_NONBLOCK set\n");
236                 DEBUGP(2, dev, "<- cm4040_read (failure)\n");
237                 return -EAGAIN;
238         }
239 
240         if (!pcmcia_dev_present(dev->p_dev))
241                 return -ENODEV;
242 
243         for (i = 0; i < 5; i++) {
244                 rc = wait_for_bulk_in_ready(dev);
245                 if (rc <= 0) {
246                         DEBUGP(5, dev, "wait_for_bulk_in_ready rc=%.2x\n", rc);
247                         DEBUGP(2, dev, "<- cm4040_read (failed)\n");
248                         if (rc == -ERESTARTSYS)
249                                 return rc;
250                         return -EIO;
251                 }
252                 dev->r_buf[i] = xinb(iobase + REG_OFFSET_BULK_IN);
253 #ifdef CM4040_DEBUG
254                 pr_debug("%lu:%2x ", i, dev->r_buf[i]);
255         }
256         pr_debug("\n");
257 #else
258         }
259 #endif
260 
261         bytes_to_read = 5 + le32_to_cpu(*(__le32 *)&dev->r_buf[1]);
262 
263         DEBUGP(6, dev, "BytesToRead=%zu\n", bytes_to_read);
264 
265         min_bytes_to_read = min(count, bytes_to_read + 5);
266         min_bytes_to_read = min_t(size_t, min_bytes_to_read, READ_WRITE_BUFFER_SIZE);
267 
268         DEBUGP(6, dev, "Min=%zu\n", min_bytes_to_read);
269 
270         for (i = 0; i < (min_bytes_to_read-5); i++) {
271                 rc = wait_for_bulk_in_ready(dev);
272                 if (rc <= 0) {
273                         DEBUGP(5, dev, "wait_for_bulk_in_ready rc=%.2x\n", rc);
274                         DEBUGP(2, dev, "<- cm4040_read (failed)\n");
275                         if (rc == -ERESTARTSYS)
276                                 return rc;
277                         return -EIO;
278                 }
279                 dev->r_buf[i+5] = xinb(iobase + REG_OFFSET_BULK_IN);
280 #ifdef CM4040_DEBUG
281                 pr_debug("%lu:%2x ", i, dev->r_buf[i]);
282         }
283         pr_debug("\n");
284 #else
285         }
286 #endif
287 
288         *ppos = min_bytes_to_read;
289         if (copy_to_user(buf, dev->r_buf, min_bytes_to_read))
290                 return -EFAULT;
291 
292         rc = wait_for_bulk_in_ready(dev);
293         if (rc <= 0) {
294                 DEBUGP(5, dev, "wait_for_bulk_in_ready rc=%.2x\n", rc);
295                 DEBUGP(2, dev, "<- cm4040_read (failed)\n");
296                 if (rc == -ERESTARTSYS)
297                         return rc;
298                 return -EIO;
299         }
300 
301         rc = write_sync_reg(SCR_READER_TO_HOST_DONE, dev);
302         if (rc <= 0) {
303                 DEBUGP(5, dev, "write_sync_reg c=%.2x\n", rc);
304                 DEBUGP(2, dev, "<- cm4040_read (failed)\n");
305                 if (rc == -ERESTARTSYS)
306                         return rc;
307                 else
308                         return -EIO;
309         }
310 
311         uc = xinb(iobase + REG_OFFSET_BULK_IN);
312 
313         DEBUGP(2, dev, "<- cm4040_read (successfully)\n");
314         return min_bytes_to_read;
315 }
316 
317 static ssize_t cm4040_write(struct file *filp, const char __user *buf,
318                          size_t count, loff_t *ppos)
319 {
320         struct reader_dev *dev = filp->private_data;
321         int iobase = dev->p_dev->resource[0]->start;
322         ssize_t rc;
323         int i;
324         unsigned int bytes_to_write;
325 
326         DEBUGP(2, dev, "-> cm4040_write(%s,%d)\n", current->comm, current->pid);
327 
328         if (count == 0) {
329                 DEBUGP(2, dev, "<- cm4040_write empty read (successfully)\n");
330                 return 0;
331         }
332 
333         if ((count < 5) || (count > READ_WRITE_BUFFER_SIZE)) {
334                 DEBUGP(2, dev, "<- cm4040_write buffersize=%Zd < 5\n", count);
335                 return -EIO;
336         }
337 
338         if (filp->f_flags & O_NONBLOCK) {
339                 DEBUGP(4, dev, "filep->f_flags O_NONBLOCK set\n");
340                 DEBUGP(4, dev, "<- cm4040_write (failure)\n");
341                 return -EAGAIN;
342         }
343 
344         if (!pcmcia_dev_present(dev->p_dev))
345                 return -ENODEV;
346 
347         bytes_to_write = count;
348         if (copy_from_user(dev->s_buf, buf, bytes_to_write))
349                 return -EFAULT;
350 
351         switch (dev->s_buf[0]) {
352                 case CMD_PC_TO_RDR_XFRBLOCK:
353                 case CMD_PC_TO_RDR_SECURE:
354                 case CMD_PC_TO_RDR_TEST_SECURE:
355                 case CMD_PC_TO_RDR_OK_SECURE:
356                         dev->timeout = CCID_DRIVER_BULK_DEFAULT_TIMEOUT;
357                         break;
358 
359                 case CMD_PC_TO_RDR_ICCPOWERON:
360                         dev->timeout = CCID_DRIVER_ASYNC_POWERUP_TIMEOUT;
361                         break;
362 
363                 case CMD_PC_TO_RDR_GETSLOTSTATUS:
364                 case CMD_PC_TO_RDR_ICCPOWEROFF:
365                 case CMD_PC_TO_RDR_GETPARAMETERS:
366                 case CMD_PC_TO_RDR_RESETPARAMETERS:
367                 case CMD_PC_TO_RDR_SETPARAMETERS:
368                 case CMD_PC_TO_RDR_ESCAPE:
369                 case CMD_PC_TO_RDR_ICCCLOCK:
370                 default:
371                         dev->timeout = CCID_DRIVER_MINIMUM_TIMEOUT;
372                         break;
373         }
374 
375         rc = write_sync_reg(SCR_HOST_TO_READER_START, dev);
376         if (rc <= 0) {
377                 DEBUGP(5, dev, "write_sync_reg c=%.2Zx\n", rc);
378                 DEBUGP(2, dev, "<- cm4040_write (failed)\n");
379                 if (rc == -ERESTARTSYS)
380                         return rc;
381                 else
382                         return -EIO;
383         }
384 
385         DEBUGP(4, dev, "start \n");
386 
387         for (i = 0; i < bytes_to_write; i++) {
388                 rc = wait_for_bulk_out_ready(dev);
389                 if (rc <= 0) {
390                         DEBUGP(5, dev, "wait_for_bulk_out_ready rc=%.2Zx\n",
391                                rc);
392                         DEBUGP(2, dev, "<- cm4040_write (failed)\n");
393                         if (rc == -ERESTARTSYS)
394                                 return rc;
395                         else
396                                 return -EIO;
397                 }
398 
399                 xoutb(dev->s_buf[i],iobase + REG_OFFSET_BULK_OUT);
400         }
401         DEBUGP(4, dev, "end\n");
402 
403         rc = write_sync_reg(SCR_HOST_TO_READER_DONE, dev);
404 
405         if (rc <= 0) {
406                 DEBUGP(5, dev, "write_sync_reg c=%.2Zx\n", rc);
407                 DEBUGP(2, dev, "<- cm4040_write (failed)\n");
408                 if (rc == -ERESTARTSYS)
409                         return rc;
410                 else
411                         return -EIO;
412         }
413 
414         DEBUGP(2, dev, "<- cm4040_write (successfully)\n");
415         return count;
416 }
417 
418 static unsigned int cm4040_poll(struct file *filp, poll_table *wait)
419 {
420         struct reader_dev *dev = filp->private_data;
421         unsigned int mask = 0;
422 
423         poll_wait(filp, &dev->poll_wait, wait);
424 
425         if (test_and_clear_bit(BS_READABLE, &dev->buffer_status))
426                 mask |= POLLIN | POLLRDNORM;
427         if (test_and_clear_bit(BS_WRITABLE, &dev->buffer_status))
428                 mask |= POLLOUT | POLLWRNORM;
429 
430         DEBUGP(2, dev, "<- cm4040_poll(%u)\n", mask);
431 
432         return mask;
433 }
434 
435 static int cm4040_open(struct inode *inode, struct file *filp)
436 {
437         struct reader_dev *dev;
438         struct pcmcia_device *link;
439         int minor = iminor(inode);
440         int ret;
441 
442         if (minor >= CM_MAX_DEV)
443                 return -ENODEV;
444 
445         mutex_lock(&cm4040_mutex);
446         link = dev_table[minor];
447         if (link == NULL || !pcmcia_dev_present(link)) {
448                 ret = -ENODEV;
449                 goto out;
450         }
451 
452         if (link->open) {
453                 ret = -EBUSY;
454                 goto out;
455         }
456 
457         dev = link->priv;
458         filp->private_data = dev;
459 
460         if (filp->f_flags & O_NONBLOCK) {
461                 DEBUGP(4, dev, "filep->f_flags O_NONBLOCK set\n");
462                 ret = -EAGAIN;
463                 goto out;
464         }
465 
466         link->open = 1;
467 
468         dev->poll_timer.data = (unsigned long) dev;
469         mod_timer(&dev->poll_timer, jiffies + POLL_PERIOD);
470 
471         DEBUGP(2, dev, "<- cm4040_open (successfully)\n");
472         ret = nonseekable_open(inode, filp);
473 out:
474         mutex_unlock(&cm4040_mutex);
475         return ret;
476 }
477 
478 static int cm4040_close(struct inode *inode, struct file *filp)
479 {
480         struct reader_dev *dev = filp->private_data;
481         struct pcmcia_device *link;
482         int minor = iminor(inode);
483 
484         DEBUGP(2, dev, "-> cm4040_close(maj/min=%d.%d)\n", imajor(inode),
485               iminor(inode));
486 
487         if (minor >= CM_MAX_DEV)
488                 return -ENODEV;
489 
490         link = dev_table[minor];
491         if (link == NULL)
492                 return -ENODEV;
493 
494         cm4040_stop_poll(dev);
495 
496         link->open = 0;
497         wake_up(&dev->devq);
498 
499         DEBUGP(2, dev, "<- cm4040_close\n");
500         return 0;
501 }
502 
503 static void cm4040_reader_release(struct pcmcia_device *link)
504 {
505         struct reader_dev *dev = link->priv;
506 
507         DEBUGP(3, dev, "-> cm4040_reader_release\n");
508         while (link->open) {
509                 DEBUGP(3, dev, KERN_INFO MODULE_NAME ": delaying release "
510                        "until process has terminated\n");
511                 wait_event(dev->devq, (link->open == 0));
512         }
513         DEBUGP(3, dev, "<- cm4040_reader_release\n");
514         return;
515 }
516 
517 static int cm4040_config_check(struct pcmcia_device *p_dev, void *priv_data)
518 {
519         return pcmcia_request_io(p_dev);
520 }
521 
522 
523 static int reader_config(struct pcmcia_device *link, int devno)
524 {
525         struct reader_dev *dev;
526         int fail_rc;
527 
528         link->config_flags |= CONF_AUTO_SET_IO;
529 
530         if (pcmcia_loop_config(link, cm4040_config_check, NULL))
531                 goto cs_release;
532 
533         fail_rc = pcmcia_enable_device(link);
534         if (fail_rc != 0) {
535                 dev_printk(KERN_INFO, &link->dev,
536                            "pcmcia_enable_device failed 0x%x\n",
537                            fail_rc);
538                 goto cs_release;
539         }
540 
541         dev = link->priv;
542 
543         DEBUGP(2, dev, "device " DEVICE_NAME "%d at %pR\n", devno,
544               link->resource[0]);
545         DEBUGP(2, dev, "<- reader_config (succ)\n");
546 
547         return 0;
548 
549 cs_release:
550         reader_release(link);
551         return -ENODEV;
552 }
553 
554 static void reader_release(struct pcmcia_device *link)
555 {
556         cm4040_reader_release(link);
557         pcmcia_disable_device(link);
558 }
559 
560 static int reader_probe(struct pcmcia_device *link)
561 {
562         struct reader_dev *dev;
563         int i, ret;
564 
565         for (i = 0; i < CM_MAX_DEV; i++) {
566                 if (dev_table[i] == NULL)
567                         break;
568         }
569 
570         if (i == CM_MAX_DEV)
571                 return -ENODEV;
572 
573         dev = kzalloc(sizeof(struct reader_dev), GFP_KERNEL);
574         if (dev == NULL)
575                 return -ENOMEM;
576 
577         dev->timeout = CCID_DRIVER_MINIMUM_TIMEOUT;
578         dev->buffer_status = 0;
579 
580         link->priv = dev;
581         dev->p_dev = link;
582 
583         dev_table[i] = link;
584 
585         init_waitqueue_head(&dev->devq);
586         init_waitqueue_head(&dev->poll_wait);
587         init_waitqueue_head(&dev->read_wait);
588         init_waitqueue_head(&dev->write_wait);
589         setup_timer(&dev->poll_timer, cm4040_do_poll, 0);
590 
591         ret = reader_config(link, i);
592         if (ret) {
593                 dev_table[i] = NULL;
594                 kfree(dev);
595                 return ret;
596         }
597 
598         device_create(cmx_class, NULL, MKDEV(major, i), NULL, "cmx%d", i);
599 
600         return 0;
601 }
602 
603 static void reader_detach(struct pcmcia_device *link)
604 {
605         struct reader_dev *dev = link->priv;
606         int devno;
607 
608         /* find device */
609         for (devno = 0; devno < CM_MAX_DEV; devno++) {
610                 if (dev_table[devno] == link)
611                         break;
612         }
613         if (devno == CM_MAX_DEV)
614                 return;
615 
616         reader_release(link);
617 
618         dev_table[devno] = NULL;
619         kfree(dev);
620 
621         device_destroy(cmx_class, MKDEV(major, devno));
622 
623         return;
624 }
625 
626 static const struct file_operations reader_fops = {
627         .owner          = THIS_MODULE,
628         .read           = cm4040_read,
629         .write          = cm4040_write,
630         .open           = cm4040_open,
631         .release        = cm4040_close,
632         .poll           = cm4040_poll,
633         .llseek         = no_llseek,
634 };
635 
636 static const struct pcmcia_device_id cm4040_ids[] = {
637         PCMCIA_DEVICE_MANF_CARD(0x0223, 0x0200),
638         PCMCIA_DEVICE_PROD_ID12("OMNIKEY", "CardMan 4040",
639                                 0xE32CDD8C, 0x8F23318B),
640         PCMCIA_DEVICE_NULL,
641 };
642 MODULE_DEVICE_TABLE(pcmcia, cm4040_ids);
643 
644 static struct pcmcia_driver reader_driver = {
645         .owner          = THIS_MODULE,
646         .name           = "cm4040_cs",
647         .probe          = reader_probe,
648         .remove         = reader_detach,
649         .id_table       = cm4040_ids,
650 };
651 
652 static int __init cm4040_init(void)
653 {
654         int rc;
655 
656         cmx_class = class_create(THIS_MODULE, "cardman_4040");
657         if (IS_ERR(cmx_class))
658                 return PTR_ERR(cmx_class);
659 
660         major = register_chrdev(0, DEVICE_NAME, &reader_fops);
661         if (major < 0) {
662                 printk(KERN_WARNING MODULE_NAME
663                         ": could not get major number\n");
664                 class_destroy(cmx_class);
665                 return major;
666         }
667 
668         rc = pcmcia_register_driver(&reader_driver);
669         if (rc < 0) {
670                 unregister_chrdev(major, DEVICE_NAME);
671                 class_destroy(cmx_class);
672                 return rc;
673         }
674 
675         return 0;
676 }
677 
678 static void __exit cm4040_exit(void)
679 {
680         pcmcia_unregister_driver(&reader_driver);
681         unregister_chrdev(major, DEVICE_NAME);
682         class_destroy(cmx_class);
683 }
684 
685 module_init(cm4040_init);
686 module_exit(cm4040_exit);
687 MODULE_LICENSE("Dual BSD/GPL");
688 

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