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22#include <linux/kernel.h>
23#include <linux/module.h>
24#include <linux/slab.h>
25#include <linux/init.h>
26#include <linux/fs.h>
27#include <linux/delay.h>
28#include <linux/poll.h>
29#include <linux/smp_lock.h>
30#include <linux/wait.h>
31#include <asm/uaccess.h>
32#include <asm/io.h>
33
34#include <pcmcia/cs_types.h>
35#include <pcmcia/cs.h>
36#include <pcmcia/cistpl.h>
37#include <pcmcia/cisreg.h>
38#include <pcmcia/ciscode.h>
39#include <pcmcia/ds.h>
40
41#include "cm4040_cs.h"
42
43
44#ifdef PCMCIA_DEBUG
45#define reader_to_dev(x) (&handle_to_dev(x->p_dev))
46static int pc_debug = PCMCIA_DEBUG;
47module_param(pc_debug, int, 0600);
48#define DEBUGP(n, rdr, x, args...) do { \
49 if (pc_debug >= (n)) \
50 dev_printk(KERN_DEBUG, reader_to_dev(rdr), "%s:" x, \
51 __func__ , ##args); \
52 } while (0)
53#else
54#define DEBUGP(n, rdr, x, args...)
55#endif
56
57static char *version =
58"OMNIKEY CardMan 4040 v1.1.0gm5 - All bugs added by Harald Welte";
59
60#define CCID_DRIVER_BULK_DEFAULT_TIMEOUT (150*HZ)
61#define CCID_DRIVER_ASYNC_POWERUP_TIMEOUT (35*HZ)
62#define CCID_DRIVER_MINIMUM_TIMEOUT (3*HZ)
63#define READ_WRITE_BUFFER_SIZE 512
64#define POLL_LOOP_COUNT 1000
65
66
67#define POLL_PERIOD msecs_to_jiffies(10)
68
69static void reader_release(struct pcmcia_device *link);
70
71static int major;
72static struct class *cmx_class;
73
74#define BS_READABLE 0x01
75#define BS_WRITABLE 0x02
76
77struct reader_dev {
78 struct pcmcia_device *p_dev;
79 dev_node_t node;
80 wait_queue_head_t devq;
81 wait_queue_head_t poll_wait;
82 wait_queue_head_t read_wait;
83 wait_queue_head_t write_wait;
84 unsigned long buffer_status;
85 unsigned long timeout;
86 unsigned char s_buf[READ_WRITE_BUFFER_SIZE];
87 unsigned char r_buf[READ_WRITE_BUFFER_SIZE];
88 struct timer_list poll_timer;
89};
90
91static struct pcmcia_device *dev_table[CM_MAX_DEV];
92
93#ifndef PCMCIA_DEBUG
94#define xoutb outb
95#define xinb inb
96#else
97static inline void xoutb(unsigned char val, unsigned short port)
98{
99 if (pc_debug >= 7)
100 printk(KERN_DEBUG "outb(val=%.2x,port=%.4x)\n", val, port);
101 outb(val, port);
102}
103
104static inline unsigned char xinb(unsigned short port)
105{
106 unsigned char val;
107
108 val = inb(port);
109 if (pc_debug >= 7)
110 printk(KERN_DEBUG "%.2x=inb(%.4x)\n", val, port);
111 return val;
112}
113#endif
114
115
116
117static void cm4040_do_poll(unsigned long dummy)
118{
119 struct reader_dev *dev = (struct reader_dev *) dummy;
120 unsigned int obs = xinb(dev->p_dev->io.BasePort1
121 + REG_OFFSET_BUFFER_STATUS);
122
123 if ((obs & BSR_BULK_IN_FULL)) {
124 set_bit(BS_READABLE, &dev->buffer_status);
125 DEBUGP(4, dev, "waking up read_wait\n");
126 wake_up_interruptible(&dev->read_wait);
127 } else
128 clear_bit(BS_READABLE, &dev->buffer_status);
129
130 if (!(obs & BSR_BULK_OUT_FULL)) {
131 set_bit(BS_WRITABLE, &dev->buffer_status);
132 DEBUGP(4, dev, "waking up write_wait\n");
133 wake_up_interruptible(&dev->write_wait);
134 } else
135 clear_bit(BS_WRITABLE, &dev->buffer_status);
136
137 if (dev->buffer_status)
138 wake_up_interruptible(&dev->poll_wait);
139
140 mod_timer(&dev->poll_timer, jiffies + POLL_PERIOD);
141}
142
143static void cm4040_stop_poll(struct reader_dev *dev)
144{
145 del_timer_sync(&dev->poll_timer);
146}
147
148static int wait_for_bulk_out_ready(struct reader_dev *dev)
149{
150 int i, rc;
151 int iobase = dev->p_dev->io.BasePort1;
152
153 for (i = 0; i < POLL_LOOP_COUNT; i++) {
154 if ((xinb(iobase + REG_OFFSET_BUFFER_STATUS)
155 & BSR_BULK_OUT_FULL) == 0) {
156 DEBUGP(4, dev, "BulkOut empty (i=%d)\n", i);
157 return 1;
158 }
159 }
160
161 DEBUGP(4, dev, "wait_event_interruptible_timeout(timeout=%ld\n",
162 dev->timeout);
163 rc = wait_event_interruptible_timeout(dev->write_wait,
164 test_and_clear_bit(BS_WRITABLE,
165 &dev->buffer_status),
166 dev->timeout);
167
168 if (rc > 0)
169 DEBUGP(4, dev, "woke up: BulkOut empty\n");
170 else if (rc == 0)
171 DEBUGP(4, dev, "woke up: BulkOut full, returning 0 :(\n");
172 else if (rc < 0)
173 DEBUGP(4, dev, "woke up: signal arrived\n");
174
175 return rc;
176}
177
178
179static int write_sync_reg(unsigned char val, struct reader_dev *dev)
180{
181 int iobase = dev->p_dev->io.BasePort1;
182 int rc;
183
184 rc = wait_for_bulk_out_ready(dev);
185 if (rc <= 0)
186 return rc;
187
188 xoutb(val, iobase + REG_OFFSET_SYNC_CONTROL);
189 rc = wait_for_bulk_out_ready(dev);
190 if (rc <= 0)
191 return rc;
192
193 return 1;
194}
195
196static int wait_for_bulk_in_ready(struct reader_dev *dev)
197{
198 int i, rc;
199 int iobase = dev->p_dev->io.BasePort1;
200
201 for (i = 0; i < POLL_LOOP_COUNT; i++) {
202 if ((xinb(iobase + REG_OFFSET_BUFFER_STATUS)
203 & BSR_BULK_IN_FULL) == BSR_BULK_IN_FULL) {
204 DEBUGP(3, dev, "BulkIn full (i=%d)\n", i);
205 return 1;
206 }
207 }
208
209 DEBUGP(4, dev, "wait_event_interruptible_timeout(timeout=%ld\n",
210 dev->timeout);
211 rc = wait_event_interruptible_timeout(dev->read_wait,
212 test_and_clear_bit(BS_READABLE,
213 &dev->buffer_status),
214 dev->timeout);
215 if (rc > 0)
216 DEBUGP(4, dev, "woke up: BulkIn full\n");
217 else if (rc == 0)
218 DEBUGP(4, dev, "woke up: BulkIn not full, returning 0 :(\n");
219 else if (rc < 0)
220 DEBUGP(4, dev, "woke up: signal arrived\n");
221
222 return rc;
223}
224
225static ssize_t cm4040_read(struct file *filp, char __user *buf,
226 size_t count, loff_t *ppos)
227{
228 struct reader_dev *dev = filp->private_data;
229 int iobase = dev->p_dev->io.BasePort1;
230 size_t bytes_to_read;
231 unsigned long i;
232 size_t min_bytes_to_read;
233 int rc;
234 unsigned char uc;
235
236 DEBUGP(2, dev, "-> cm4040_read(%s,%d)\n", current->comm, current->pid);
237
238 if (count == 0)
239 return 0;
240
241 if (count < 10)
242 return -EFAULT;
243
244 if (filp->f_flags & O_NONBLOCK) {
245 DEBUGP(4, dev, "filep->f_flags O_NONBLOCK set\n");
246 DEBUGP(2, dev, "<- cm4040_read (failure)\n");
247 return -EAGAIN;
248 }
249
250 if (!pcmcia_dev_present(dev->p_dev))
251 return -ENODEV;
252
253 for (i = 0; i < 5; i++) {
254 rc = wait_for_bulk_in_ready(dev);
255 if (rc <= 0) {
256 DEBUGP(5, dev, "wait_for_bulk_in_ready rc=%.2x\n", rc);
257 DEBUGP(2, dev, "<- cm4040_read (failed)\n");
258 if (rc == -ERESTARTSYS)
259 return rc;
260 return -EIO;
261 }
262 dev->r_buf[i] = xinb(iobase + REG_OFFSET_BULK_IN);
263#ifdef PCMCIA_DEBUG
264 if (pc_debug >= 6)
265 printk(KERN_DEBUG "%lu:%2x ", i, dev->r_buf[i]);
266 }
267 printk("\n");
268#else
269 }
270#endif
271
272 bytes_to_read = 5 + le32_to_cpu(*(__le32 *)&dev->r_buf[1]);
273
274 DEBUGP(6, dev, "BytesToRead=%lu\n", bytes_to_read);
275
276 min_bytes_to_read = min(count, bytes_to_read + 5);
277 min_bytes_to_read = min_t(size_t, min_bytes_to_read, READ_WRITE_BUFFER_SIZE);
278
279 DEBUGP(6, dev, "Min=%lu\n", min_bytes_to_read);
280
281 for (i = 0; i < (min_bytes_to_read-5); i++) {
282 rc = wait_for_bulk_in_ready(dev);
283 if (rc <= 0) {
284 DEBUGP(5, dev, "wait_for_bulk_in_ready rc=%.2x\n", rc);
285 DEBUGP(2, dev, "<- cm4040_read (failed)\n");
286 if (rc == -ERESTARTSYS)
287 return rc;
288 return -EIO;
289 }
290 dev->r_buf[i+5] = xinb(iobase + REG_OFFSET_BULK_IN);
291#ifdef PCMCIA_DEBUG
292 if (pc_debug >= 6)
293 printk(KERN_DEBUG "%lu:%2x ", i, dev->r_buf[i]);
294 }
295 printk("\n");
296#else
297 }
298#endif
299
300 *ppos = min_bytes_to_read;
301 if (copy_to_user(buf, dev->r_buf, min_bytes_to_read))
302 return -EFAULT;
303
304 rc = wait_for_bulk_in_ready(dev);
305 if (rc <= 0) {
306 DEBUGP(5, dev, "wait_for_bulk_in_ready rc=%.2x\n", rc);
307 DEBUGP(2, dev, "<- cm4040_read (failed)\n");
308 if (rc == -ERESTARTSYS)
309 return rc;
310 return -EIO;
311 }
312
313 rc = write_sync_reg(SCR_READER_TO_HOST_DONE, dev);
314 if (rc <= 0) {
315 DEBUGP(5, dev, "write_sync_reg c=%.2x\n", rc);
316 DEBUGP(2, dev, "<- cm4040_read (failed)\n");
317 if (rc == -ERESTARTSYS)
318 return rc;
319 else
320 return -EIO;
321 }
322
323 uc = xinb(iobase + REG_OFFSET_BULK_IN);
324
325 DEBUGP(2, dev, "<- cm4040_read (successfully)\n");
326 return min_bytes_to_read;
327}
328
329static ssize_t cm4040_write(struct file *filp, const char __user *buf,
330 size_t count, loff_t *ppos)
331{
332 struct reader_dev *dev = filp->private_data;
333 int iobase = dev->p_dev->io.BasePort1;
334 ssize_t rc;
335 int i;
336 unsigned int bytes_to_write;
337
338 DEBUGP(2, dev, "-> cm4040_write(%s,%d)\n", current->comm, current->pid);
339
340 if (count == 0) {
341 DEBUGP(2, dev, "<- cm4040_write empty read (successfully)\n");
342 return 0;
343 }
344
345 if ((count < 5) || (count > READ_WRITE_BUFFER_SIZE)) {
346 DEBUGP(2, dev, "<- cm4040_write buffersize=%Zd < 5\n", count);
347 return -EIO;
348 }
349
350 if (filp->f_flags & O_NONBLOCK) {
351 DEBUGP(4, dev, "filep->f_flags O_NONBLOCK set\n");
352 DEBUGP(4, dev, "<- cm4040_write (failure)\n");
353 return -EAGAIN;
354 }
355
356 if (!pcmcia_dev_present(dev->p_dev))
357 return -ENODEV;
358
359 bytes_to_write = count;
360 if (copy_from_user(dev->s_buf, buf, bytes_to_write))
361 return -EFAULT;
362
363 switch (dev->s_buf[0]) {
364 case CMD_PC_TO_RDR_XFRBLOCK:
365 case CMD_PC_TO_RDR_SECURE:
366 case CMD_PC_TO_RDR_TEST_SECURE:
367 case CMD_PC_TO_RDR_OK_SECURE:
368 dev->timeout = CCID_DRIVER_BULK_DEFAULT_TIMEOUT;
369 break;
370
371 case CMD_PC_TO_RDR_ICCPOWERON:
372 dev->timeout = CCID_DRIVER_ASYNC_POWERUP_TIMEOUT;
373 break;
374
375 case CMD_PC_TO_RDR_GETSLOTSTATUS:
376 case CMD_PC_TO_RDR_ICCPOWEROFF:
377 case CMD_PC_TO_RDR_GETPARAMETERS:
378 case CMD_PC_TO_RDR_RESETPARAMETERS:
379 case CMD_PC_TO_RDR_SETPARAMETERS:
380 case CMD_PC_TO_RDR_ESCAPE:
381 case CMD_PC_TO_RDR_ICCCLOCK:
382 default:
383 dev->timeout = CCID_DRIVER_MINIMUM_TIMEOUT;
384 break;
385 }
386
387 rc = write_sync_reg(SCR_HOST_TO_READER_START, dev);
388 if (rc <= 0) {
389 DEBUGP(5, dev, "write_sync_reg c=%.2Zx\n", rc);
390 DEBUGP(2, dev, "<- cm4040_write (failed)\n");
391 if (rc == -ERESTARTSYS)
392 return rc;
393 else
394 return -EIO;
395 }
396
397 DEBUGP(4, dev, "start \n");
398
399 for (i = 0; i < bytes_to_write; i++) {
400 rc = wait_for_bulk_out_ready(dev);
401 if (rc <= 0) {
402 DEBUGP(5, dev, "wait_for_bulk_out_ready rc=%.2Zx\n",
403 rc);
404 DEBUGP(2, dev, "<- cm4040_write (failed)\n");
405 if (rc == -ERESTARTSYS)
406 return rc;
407 else
408 return -EIO;
409 }
410
411 xoutb(dev->s_buf[i],iobase + REG_OFFSET_BULK_OUT);
412 }
413 DEBUGP(4, dev, "end\n");
414
415 rc = write_sync_reg(SCR_HOST_TO_READER_DONE, dev);
416
417 if (rc <= 0) {
418 DEBUGP(5, dev, "write_sync_reg c=%.2Zx\n", rc);
419 DEBUGP(2, dev, "<- cm4040_write (failed)\n");
420 if (rc == -ERESTARTSYS)
421 return rc;
422 else
423 return -EIO;
424 }
425
426 DEBUGP(2, dev, "<- cm4040_write (successfully)\n");
427 return count;
428}
429
430static unsigned int cm4040_poll(struct file *filp, poll_table *wait)
431{
432 struct reader_dev *dev = filp->private_data;
433 unsigned int mask = 0;
434
435 poll_wait(filp, &dev->poll_wait, wait);
436
437 if (test_and_clear_bit(BS_READABLE, &dev->buffer_status))
438 mask |= POLLIN | POLLRDNORM;
439 if (test_and_clear_bit(BS_WRITABLE, &dev->buffer_status))
440 mask |= POLLOUT | POLLWRNORM;
441
442 DEBUGP(2, dev, "<- cm4040_poll(%u)\n", mask);
443
444 return mask;
445}
446
447static int cm4040_open(struct inode *inode, struct file *filp)
448{
449 struct reader_dev *dev;
450 struct pcmcia_device *link;
451 int minor = iminor(inode);
452 int ret;
453
454 if (minor >= CM_MAX_DEV)
455 return -ENODEV;
456
457 lock_kernel();
458 link = dev_table[minor];
459 if (link == NULL || !pcmcia_dev_present(link)) {
460 ret = -ENODEV;
461 goto out;
462 }
463
464 if (link->open) {
465 ret = -EBUSY;
466 goto out;
467 }
468
469 dev = link->priv;
470 filp->private_data = dev;
471
472 if (filp->f_flags & O_NONBLOCK) {
473 DEBUGP(4, dev, "filep->f_flags O_NONBLOCK set\n");
474 ret = -EAGAIN;
475 goto out;
476 }
477
478 link->open = 1;
479
480 dev->poll_timer.data = (unsigned long) dev;
481 mod_timer(&dev->poll_timer, jiffies + POLL_PERIOD);
482
483 DEBUGP(2, dev, "<- cm4040_open (successfully)\n");
484 ret = nonseekable_open(inode, filp);
485out:
486 unlock_kernel();
487 return ret;
488}
489
490static int cm4040_close(struct inode *inode, struct file *filp)
491{
492 struct reader_dev *dev = filp->private_data;
493 struct pcmcia_device *link;
494 int minor = iminor(inode);
495
496 DEBUGP(2, dev, "-> cm4040_close(maj/min=%d.%d)\n", imajor(inode),
497 iminor(inode));
498
499 if (minor >= CM_MAX_DEV)
500 return -ENODEV;
501
502 link = dev_table[minor];
503 if (link == NULL)
504 return -ENODEV;
505
506 cm4040_stop_poll(dev);
507
508 link->open = 0;
509 wake_up(&dev->devq);
510
511 DEBUGP(2, dev, "<- cm4040_close\n");
512 return 0;
513}
514
515static void cm4040_reader_release(struct pcmcia_device *link)
516{
517 struct reader_dev *dev = link->priv;
518
519 DEBUGP(3, dev, "-> cm4040_reader_release\n");
520 while (link->open) {
521 DEBUGP(3, dev, KERN_INFO MODULE_NAME ": delaying release "
522 "until process has terminated\n");
523 wait_event(dev->devq, (link->open == 0));
524 }
525 DEBUGP(3, dev, "<- cm4040_reader_release\n");
526 return;
527}
528
529static int cm4040_config_check(struct pcmcia_device *p_dev,
530 cistpl_cftable_entry_t *cfg,
531 cistpl_cftable_entry_t *dflt,
532 unsigned int vcc,
533 void *priv_data)
534{
535 int rc;
536 if (!cfg->io.nwin)
537 return -ENODEV;
538
539
540 p_dev->io.BasePort1 = cfg->io.win[0].base;
541 p_dev->io.NumPorts1 = cfg->io.win[0].len;
542 p_dev->io.Attributes1 = IO_DATA_PATH_WIDTH_AUTO;
543 if (!(cfg->io.flags & CISTPL_IO_8BIT))
544 p_dev->io.Attributes1 = IO_DATA_PATH_WIDTH_16;
545 if (!(cfg->io.flags & CISTPL_IO_16BIT))
546 p_dev->io.Attributes1 = IO_DATA_PATH_WIDTH_8;
547 p_dev->io.IOAddrLines = cfg->io.flags & CISTPL_IO_LINES_MASK;
548
549 rc = pcmcia_request_io(p_dev, &p_dev->io);
550 dev_printk(KERN_INFO, &handle_to_dev(p_dev),
551 "pcmcia_request_io returned 0x%x\n", rc);
552 return rc;
553}
554
555
556static int reader_config(struct pcmcia_device *link, int devno)
557{
558 struct reader_dev *dev;
559 int fail_rc;
560
561 link->io.BasePort2 = 0;
562 link->io.NumPorts2 = 0;
563 link->io.Attributes2 = 0;
564
565 if (pcmcia_loop_config(link, cm4040_config_check, NULL))
566 goto cs_release;
567
568 link->conf.IntType = 00000002;
569
570 fail_rc = pcmcia_request_configuration(link, &link->conf);
571 if (fail_rc != 0) {
572 dev_printk(KERN_INFO, &handle_to_dev(link),
573 "pcmcia_request_configuration failed 0x%x\n",
574 fail_rc);
575 goto cs_release;
576 }
577
578 dev = link->priv;
579 sprintf(dev->node.dev_name, DEVICE_NAME "%d", devno);
580 dev->node.major = major;
581 dev->node.minor = devno;
582 dev->node.next = &dev->node;
583
584 DEBUGP(2, dev, "device " DEVICE_NAME "%d at 0x%.4x-0x%.4x\n", devno,
585 link->io.BasePort1, link->io.BasePort1+link->io.NumPorts1);
586 DEBUGP(2, dev, "<- reader_config (succ)\n");
587
588 return 0;
589
590cs_release:
591 reader_release(link);
592 return -ENODEV;
593}
594
595static void reader_release(struct pcmcia_device *link)
596{
597 cm4040_reader_release(link);
598 pcmcia_disable_device(link);
599}
600
601static int reader_probe(struct pcmcia_device *link)
602{
603 struct reader_dev *dev;
604 int i, ret;
605
606 for (i = 0; i < CM_MAX_DEV; i++) {
607 if (dev_table[i] == NULL)
608 break;
609 }
610
611 if (i == CM_MAX_DEV)
612 return -ENODEV;
613
614 dev = kzalloc(sizeof(struct reader_dev), GFP_KERNEL);
615 if (dev == NULL)
616 return -ENOMEM;
617
618 dev->timeout = CCID_DRIVER_MINIMUM_TIMEOUT;
619 dev->buffer_status = 0;
620
621 link->priv = dev;
622 dev->p_dev = link;
623
624 link->conf.IntType = INT_MEMORY_AND_IO;
625 dev_table[i] = link;
626
627 init_waitqueue_head(&dev->devq);
628 init_waitqueue_head(&dev->poll_wait);
629 init_waitqueue_head(&dev->read_wait);
630 init_waitqueue_head(&dev->write_wait);
631 setup_timer(&dev->poll_timer, cm4040_do_poll, 0);
632
633 ret = reader_config(link, i);
634 if (ret) {
635 dev_table[i] = NULL;
636 kfree(dev);
637 return ret;
638 }
639
640 device_create(cmx_class, NULL, MKDEV(major, i), NULL, "cmx%d", i);
641
642 return 0;
643}
644
645static void reader_detach(struct pcmcia_device *link)
646{
647 struct reader_dev *dev = link->priv;
648 int devno;
649
650
651 for (devno = 0; devno < CM_MAX_DEV; devno++) {
652 if (dev_table[devno] == link)
653 break;
654 }
655 if (devno == CM_MAX_DEV)
656 return;
657
658 reader_release(link);
659
660 dev_table[devno] = NULL;
661 kfree(dev);
662
663 device_destroy(cmx_class, MKDEV(major, devno));
664
665 return;
666}
667
668static const struct file_operations reader_fops = {
669 .owner = THIS_MODULE,
670 .read = cm4040_read,
671 .write = cm4040_write,
672 .open = cm4040_open,
673 .release = cm4040_close,
674 .poll = cm4040_poll,
675};
676
677static struct pcmcia_device_id cm4040_ids[] = {
678 PCMCIA_DEVICE_MANF_CARD(0x0223, 0x0200),
679 PCMCIA_DEVICE_PROD_ID12("OMNIKEY", "CardMan 4040",
680 0xE32CDD8C, 0x8F23318B),
681 PCMCIA_DEVICE_NULL,
682};
683MODULE_DEVICE_TABLE(pcmcia, cm4040_ids);
684
685static struct pcmcia_driver reader_driver = {
686 .owner = THIS_MODULE,
687 .drv = {
688 .name = "cm4040_cs",
689 },
690 .probe = reader_probe,
691 .remove = reader_detach,
692 .id_table = cm4040_ids,
693};
694
695static int __init cm4040_init(void)
696{
697 int rc;
698
699 printk(KERN_INFO "%s\n", version);
700 cmx_class = class_create(THIS_MODULE, "cardman_4040");
701 if (IS_ERR(cmx_class))
702 return PTR_ERR(cmx_class);
703
704 major = register_chrdev(0, DEVICE_NAME, &reader_fops);
705 if (major < 0) {
706 printk(KERN_WARNING MODULE_NAME
707 ": could not get major number\n");
708 class_destroy(cmx_class);
709 return major;
710 }
711
712 rc = pcmcia_register_driver(&reader_driver);
713 if (rc < 0) {
714 unregister_chrdev(major, DEVICE_NAME);
715 class_destroy(cmx_class);
716 return rc;
717 }
718
719 return 0;
720}
721
722static void __exit cm4040_exit(void)
723{
724 printk(KERN_INFO MODULE_NAME ": unloading\n");
725 pcmcia_unregister_driver(&reader_driver);
726 unregister_chrdev(major, DEVICE_NAME);
727 class_destroy(cmx_class);
728}
729
730module_init(cm4040_init);
731module_exit(cm4040_exit);
732MODULE_LICENSE("Dual BSD/GPL");
733
