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59#include <linux/module.h>
60#include <linux/init.h>
61#include <linux/sched/signal.h>
62#include <linux/device.h>
63#include <linux/ioctl.h>
64#include <linux/parport.h>
65#include <linux/ctype.h>
66#include <linux/poll.h>
67#include <linux/slab.h>
68#include <linux/major.h>
69#include <linux/ppdev.h>
70#include <linux/mutex.h>
71#include <linux/uaccess.h>
72#include <linux/compat.h>
73
74#define PP_VERSION "ppdev: user-space parallel port driver"
75#define CHRDEV "ppdev"
76
77struct pp_struct {
78 struct pardevice *pdev;
79 wait_queue_head_t irq_wait;
80 atomic_t irqc;
81 unsigned int flags;
82 int irqresponse;
83 unsigned char irqctl;
84 struct ieee1284_info state;
85 struct ieee1284_info saved_state;
86 long default_inactivity;
87 int index;
88};
89
90
91static struct device *devices[PARPORT_MAX];
92
93static DEFINE_IDA(ida_index);
94
95
96#define PP_CLAIMED (1<<0)
97#define PP_EXCL (1<<1)
98
99
100#define PP_INTERRUPT_TIMEOUT (10 * HZ)
101#define PP_BUFFER_SIZE 1024
102#define PARDEVICE_MAX 8
103
104static DEFINE_MUTEX(pp_do_mutex);
105
106
107#define PPGETTIME32 _IOR(PP_IOCTL, 0x95, s32[2])
108#define PPSETTIME32 _IOW(PP_IOCTL, 0x96, s32[2])
109#define PPGETTIME64 _IOR(PP_IOCTL, 0x95, s64[2])
110#define PPSETTIME64 _IOW(PP_IOCTL, 0x96, s64[2])
111
112static inline void pp_enable_irq(struct pp_struct *pp)
113{
114 struct parport *port = pp->pdev->port;
115
116 port->ops->enable_irq(port);
117}
118
119static ssize_t pp_read(struct file *file, char __user *buf, size_t count,
120 loff_t *ppos)
121{
122 unsigned int minor = iminor(file_inode(file));
123 struct pp_struct *pp = file->private_data;
124 char *kbuffer;
125 ssize_t bytes_read = 0;
126 struct parport *pport;
127 int mode;
128
129 if (!(pp->flags & PP_CLAIMED)) {
130
131 pr_debug(CHRDEV "%x: claim the port first\n", minor);
132 return -EINVAL;
133 }
134
135
136 if (count == 0)
137 return 0;
138
139 kbuffer = kmalloc(min_t(size_t, count, PP_BUFFER_SIZE), GFP_KERNEL);
140 if (!kbuffer)
141 return -ENOMEM;
142 pport = pp->pdev->port;
143 mode = pport->ieee1284.mode & ~(IEEE1284_DEVICEID | IEEE1284_ADDR);
144
145 parport_set_timeout(pp->pdev,
146 (file->f_flags & O_NONBLOCK) ?
147 PARPORT_INACTIVITY_O_NONBLOCK :
148 pp->default_inactivity);
149
150 while (bytes_read == 0) {
151 ssize_t need = min_t(unsigned long, count, PP_BUFFER_SIZE);
152
153 if (mode == IEEE1284_MODE_EPP) {
154
155 int flags = 0;
156 size_t (*fn)(struct parport *, void *, size_t, int);
157
158 if (pp->flags & PP_W91284PIC)
159 flags |= PARPORT_W91284PIC;
160 if (pp->flags & PP_FASTREAD)
161 flags |= PARPORT_EPP_FAST;
162 if (pport->ieee1284.mode & IEEE1284_ADDR)
163 fn = pport->ops->epp_read_addr;
164 else
165 fn = pport->ops->epp_read_data;
166 bytes_read = (*fn)(pport, kbuffer, need, flags);
167 } else {
168 bytes_read = parport_read(pport, kbuffer, need);
169 }
170
171 if (bytes_read != 0)
172 break;
173
174 if (file->f_flags & O_NONBLOCK) {
175 bytes_read = -EAGAIN;
176 break;
177 }
178
179 if (signal_pending(current)) {
180 bytes_read = -ERESTARTSYS;
181 break;
182 }
183
184 cond_resched();
185 }
186
187 parport_set_timeout(pp->pdev, pp->default_inactivity);
188
189 if (bytes_read > 0 && copy_to_user(buf, kbuffer, bytes_read))
190 bytes_read = -EFAULT;
191
192 kfree(kbuffer);
193 pp_enable_irq(pp);
194 return bytes_read;
195}
196
197static ssize_t pp_write(struct file *file, const char __user *buf,
198 size_t count, loff_t *ppos)
199{
200 unsigned int minor = iminor(file_inode(file));
201 struct pp_struct *pp = file->private_data;
202 char *kbuffer;
203 ssize_t bytes_written = 0;
204 ssize_t wrote;
205 int mode;
206 struct parport *pport;
207
208 if (!(pp->flags & PP_CLAIMED)) {
209
210 pr_debug(CHRDEV "%x: claim the port first\n", minor);
211 return -EINVAL;
212 }
213
214 kbuffer = kmalloc(min_t(size_t, count, PP_BUFFER_SIZE), GFP_KERNEL);
215 if (!kbuffer)
216 return -ENOMEM;
217
218 pport = pp->pdev->port;
219 mode = pport->ieee1284.mode & ~(IEEE1284_DEVICEID | IEEE1284_ADDR);
220
221 parport_set_timeout(pp->pdev,
222 (file->f_flags & O_NONBLOCK) ?
223 PARPORT_INACTIVITY_O_NONBLOCK :
224 pp->default_inactivity);
225
226 while (bytes_written < count) {
227 ssize_t n = min_t(unsigned long, count - bytes_written, PP_BUFFER_SIZE);
228
229 if (copy_from_user(kbuffer, buf + bytes_written, n)) {
230 bytes_written = -EFAULT;
231 break;
232 }
233
234 if ((pp->flags & PP_FASTWRITE) && (mode == IEEE1284_MODE_EPP)) {
235
236 if (pport->ieee1284.mode & IEEE1284_ADDR) {
237 wrote = pport->ops->epp_write_addr(pport,
238 kbuffer, n, PARPORT_EPP_FAST);
239 } else {
240 wrote = pport->ops->epp_write_data(pport,
241 kbuffer, n, PARPORT_EPP_FAST);
242 }
243 } else {
244 wrote = parport_write(pp->pdev->port, kbuffer, n);
245 }
246
247 if (wrote <= 0) {
248 if (!bytes_written)
249 bytes_written = wrote;
250 break;
251 }
252
253 bytes_written += wrote;
254
255 if (file->f_flags & O_NONBLOCK) {
256 if (!bytes_written)
257 bytes_written = -EAGAIN;
258 break;
259 }
260
261 if (signal_pending(current))
262 break;
263
264 cond_resched();
265 }
266
267 parport_set_timeout(pp->pdev, pp->default_inactivity);
268
269 kfree(kbuffer);
270 pp_enable_irq(pp);
271 return bytes_written;
272}
273
274static void pp_irq(void *private)
275{
276 struct pp_struct *pp = private;
277
278 if (pp->irqresponse) {
279 parport_write_control(pp->pdev->port, pp->irqctl);
280 pp->irqresponse = 0;
281 }
282
283 atomic_inc(&pp->irqc);
284 wake_up_interruptible(&pp->irq_wait);
285}
286
287static int register_device(int minor, struct pp_struct *pp)
288{
289 struct parport *port;
290 struct pardevice *pdev = NULL;
291 char *name;
292 struct pardev_cb ppdev_cb;
293 int rc = 0, index;
294
295 name = kasprintf(GFP_KERNEL, CHRDEV "%x", minor);
296 if (name == NULL)
297 return -ENOMEM;
298
299 port = parport_find_number(minor);
300 if (!port) {
301 pr_warn("%s: no associated port!\n", name);
302 rc = -ENXIO;
303 goto err;
304 }
305
306 index = ida_simple_get(&ida_index, 0, 0, GFP_KERNEL);
307 memset(&ppdev_cb, 0, sizeof(ppdev_cb));
308 ppdev_cb.irq_func = pp_irq;
309 ppdev_cb.flags = (pp->flags & PP_EXCL) ? PARPORT_FLAG_EXCL : 0;
310 ppdev_cb.private = pp;
311 pdev = parport_register_dev_model(port, name, &ppdev_cb, index);
312 parport_put_port(port);
313
314 if (!pdev) {
315 pr_warn("%s: failed to register device!\n", name);
316 rc = -ENXIO;
317 ida_simple_remove(&ida_index, index);
318 goto err;
319 }
320
321 pp->pdev = pdev;
322 pp->index = index;
323 dev_dbg(&pdev->dev, "registered pardevice\n");
324err:
325 kfree(name);
326 return rc;
327}
328
329static enum ieee1284_phase init_phase(int mode)
330{
331 switch (mode & ~(IEEE1284_DEVICEID
332 | IEEE1284_ADDR)) {
333 case IEEE1284_MODE_NIBBLE:
334 case IEEE1284_MODE_BYTE:
335 return IEEE1284_PH_REV_IDLE;
336 }
337 return IEEE1284_PH_FWD_IDLE;
338}
339
340static int pp_set_timeout(struct pardevice *pdev, long tv_sec, int tv_usec)
341{
342 long to_jiffies;
343
344 if ((tv_sec < 0) || (tv_usec < 0))
345 return -EINVAL;
346
347 to_jiffies = usecs_to_jiffies(tv_usec);
348 to_jiffies += tv_sec * HZ;
349 if (to_jiffies <= 0)
350 return -EINVAL;
351
352 pdev->timeout = to_jiffies;
353 return 0;
354}
355
356static int pp_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
357{
358 unsigned int minor = iminor(file_inode(file));
359 struct pp_struct *pp = file->private_data;
360 struct parport *port;
361 void __user *argp = (void __user *)arg;
362
363
364 switch (cmd) {
365 case PPCLAIM:
366 {
367 struct ieee1284_info *info;
368 int ret;
369
370 if (pp->flags & PP_CLAIMED) {
371 dev_dbg(&pp->pdev->dev, "you've already got it!\n");
372 return -EINVAL;
373 }
374
375
376 if (!pp->pdev) {
377 int err = register_device(minor, pp);
378
379 if (err)
380 return err;
381 }
382
383 ret = parport_claim_or_block(pp->pdev);
384 if (ret < 0)
385 return ret;
386
387 pp->flags |= PP_CLAIMED;
388
389
390
391 pp_enable_irq(pp);
392
393
394 info = &pp->pdev->port->ieee1284;
395 pp->saved_state.mode = info->mode;
396 pp->saved_state.phase = info->phase;
397 info->mode = pp->state.mode;
398 info->phase = pp->state.phase;
399 pp->default_inactivity = parport_set_timeout(pp->pdev, 0);
400 parport_set_timeout(pp->pdev, pp->default_inactivity);
401
402 return 0;
403 }
404 case PPEXCL:
405 if (pp->pdev) {
406 dev_dbg(&pp->pdev->dev,
407 "too late for PPEXCL; already registered\n");
408 if (pp->flags & PP_EXCL)
409
410 return 0;
411
412 return -EINVAL;
413 }
414
415
416
417 pp->flags |= PP_EXCL;
418 return 0;
419 case PPSETMODE:
420 {
421 int mode;
422
423 if (copy_from_user(&mode, argp, sizeof(mode)))
424 return -EFAULT;
425
426 pp->state.mode = mode;
427 pp->state.phase = init_phase(mode);
428
429 if (pp->flags & PP_CLAIMED) {
430 pp->pdev->port->ieee1284.mode = mode;
431 pp->pdev->port->ieee1284.phase = pp->state.phase;
432 }
433
434 return 0;
435 }
436 case PPGETMODE:
437 {
438 int mode;
439
440 if (pp->flags & PP_CLAIMED)
441 mode = pp->pdev->port->ieee1284.mode;
442 else
443 mode = pp->state.mode;
444
445 if (copy_to_user(argp, &mode, sizeof(mode)))
446 return -EFAULT;
447 return 0;
448 }
449 case PPSETPHASE:
450 {
451 int phase;
452
453 if (copy_from_user(&phase, argp, sizeof(phase)))
454 return -EFAULT;
455
456
457 pp->state.phase = phase;
458
459 if (pp->flags & PP_CLAIMED)
460 pp->pdev->port->ieee1284.phase = phase;
461
462 return 0;
463 }
464 case PPGETPHASE:
465 {
466 int phase;
467
468 if (pp->flags & PP_CLAIMED)
469 phase = pp->pdev->port->ieee1284.phase;
470 else
471 phase = pp->state.phase;
472 if (copy_to_user(argp, &phase, sizeof(phase)))
473 return -EFAULT;
474 return 0;
475 }
476 case PPGETMODES:
477 {
478 unsigned int modes;
479
480 port = parport_find_number(minor);
481 if (!port)
482 return -ENODEV;
483
484 modes = port->modes;
485 parport_put_port(port);
486 if (copy_to_user(argp, &modes, sizeof(modes)))
487 return -EFAULT;
488 return 0;
489 }
490 case PPSETFLAGS:
491 {
492 int uflags;
493
494 if (copy_from_user(&uflags, argp, sizeof(uflags)))
495 return -EFAULT;
496 pp->flags &= ~PP_FLAGMASK;
497 pp->flags |= (uflags & PP_FLAGMASK);
498 return 0;
499 }
500 case PPGETFLAGS:
501 {
502 int uflags;
503
504 uflags = pp->flags & PP_FLAGMASK;
505 if (copy_to_user(argp, &uflags, sizeof(uflags)))
506 return -EFAULT;
507 return 0;
508 }
509 }
510
511
512
513 if ((pp->flags & PP_CLAIMED) == 0) {
514 pr_debug(CHRDEV "%x: claim the port first\n", minor);
515 return -EINVAL;
516 }
517
518 port = pp->pdev->port;
519 switch (cmd) {
520 struct ieee1284_info *info;
521 unsigned char reg;
522 unsigned char mask;
523 int mode;
524 s32 time32[2];
525 s64 time64[2];
526 struct timespec64 ts;
527 int ret;
528
529 case PPRSTATUS:
530 reg = parport_read_status(port);
531 if (copy_to_user(argp, ®, sizeof(reg)))
532 return -EFAULT;
533 return 0;
534 case PPRDATA:
535 reg = parport_read_data(port);
536 if (copy_to_user(argp, ®, sizeof(reg)))
537 return -EFAULT;
538 return 0;
539 case PPRCONTROL:
540 reg = parport_read_control(port);
541 if (copy_to_user(argp, ®, sizeof(reg)))
542 return -EFAULT;
543 return 0;
544 case PPYIELD:
545 parport_yield_blocking(pp->pdev);
546 return 0;
547
548 case PPRELEASE:
549
550 info = &pp->pdev->port->ieee1284;
551 pp->state.mode = info->mode;
552 pp->state.phase = info->phase;
553 info->mode = pp->saved_state.mode;
554 info->phase = pp->saved_state.phase;
555 parport_release(pp->pdev);
556 pp->flags &= ~PP_CLAIMED;
557 return 0;
558
559 case PPWCONTROL:
560 if (copy_from_user(®, argp, sizeof(reg)))
561 return -EFAULT;
562 parport_write_control(port, reg);
563 return 0;
564
565 case PPWDATA:
566 if (copy_from_user(®, argp, sizeof(reg)))
567 return -EFAULT;
568 parport_write_data(port, reg);
569 return 0;
570
571 case PPFCONTROL:
572 if (copy_from_user(&mask, argp,
573 sizeof(mask)))
574 return -EFAULT;
575 if (copy_from_user(®, 1 + (unsigned char __user *) arg,
576 sizeof(reg)))
577 return -EFAULT;
578 parport_frob_control(port, mask, reg);
579 return 0;
580
581 case PPDATADIR:
582 if (copy_from_user(&mode, argp, sizeof(mode)))
583 return -EFAULT;
584 if (mode)
585 port->ops->data_reverse(port);
586 else
587 port->ops->data_forward(port);
588 return 0;
589
590 case PPNEGOT:
591 if (copy_from_user(&mode, argp, sizeof(mode)))
592 return -EFAULT;
593 switch ((ret = parport_negotiate(port, mode))) {
594 case 0: break;
595 case -1:
596 ret = -EIO;
597 break;
598 case 1:
599 ret = -ENXIO;
600 break;
601 }
602 pp_enable_irq(pp);
603 return ret;
604
605 case PPWCTLONIRQ:
606 if (copy_from_user(®, argp, sizeof(reg)))
607 return -EFAULT;
608
609
610
611 pp->irqctl = reg;
612 pp->irqresponse = 1;
613 return 0;
614
615 case PPCLRIRQ:
616 ret = atomic_read(&pp->irqc);
617 if (copy_to_user(argp, &ret, sizeof(ret)))
618 return -EFAULT;
619 atomic_sub(ret, &pp->irqc);
620 return 0;
621
622 case PPSETTIME32:
623 if (copy_from_user(time32, argp, sizeof(time32)))
624 return -EFAULT;
625
626 return pp_set_timeout(pp->pdev, time32[0], time32[1]);
627
628 case PPSETTIME64:
629 if (copy_from_user(time64, argp, sizeof(time64)))
630 return -EFAULT;
631
632 return pp_set_timeout(pp->pdev, time64[0], time64[1]);
633
634 case PPGETTIME32:
635 jiffies_to_timespec64(pp->pdev->timeout, &ts);
636 time32[0] = ts.tv_sec;
637 time32[1] = ts.tv_nsec / NSEC_PER_USEC;
638 if ((time32[0] < 0) || (time32[1] < 0))
639 return -EINVAL;
640
641 if (copy_to_user(argp, time32, sizeof(time32)))
642 return -EFAULT;
643
644 return 0;
645
646 case PPGETTIME64:
647 jiffies_to_timespec64(pp->pdev->timeout, &ts);
648 time64[0] = ts.tv_sec;
649 time64[1] = ts.tv_nsec / NSEC_PER_USEC;
650 if ((time64[0] < 0) || (time64[1] < 0))
651 return -EINVAL;
652
653 if (copy_to_user(argp, time64, sizeof(time64)))
654 return -EFAULT;
655
656 return 0;
657
658 default:
659 dev_dbg(&pp->pdev->dev, "What? (cmd=0x%x)\n", cmd);
660 return -EINVAL;
661 }
662
663
664 return 0;
665}
666
667static long pp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
668{
669 long ret;
670
671 mutex_lock(&pp_do_mutex);
672 ret = pp_do_ioctl(file, cmd, arg);
673 mutex_unlock(&pp_do_mutex);
674 return ret;
675}
676
677#ifdef CONFIG_COMPAT
678static long pp_compat_ioctl(struct file *file, unsigned int cmd,
679 unsigned long arg)
680{
681 return pp_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
682}
683#endif
684
685static int pp_open(struct inode *inode, struct file *file)
686{
687 unsigned int minor = iminor(inode);
688 struct pp_struct *pp;
689
690 if (minor >= PARPORT_MAX)
691 return -ENXIO;
692
693 pp = kmalloc(sizeof(struct pp_struct), GFP_KERNEL);
694 if (!pp)
695 return -ENOMEM;
696
697 pp->state.mode = IEEE1284_MODE_COMPAT;
698 pp->state.phase = init_phase(pp->state.mode);
699 pp->flags = 0;
700 pp->irqresponse = 0;
701 atomic_set(&pp->irqc, 0);
702 init_waitqueue_head(&pp->irq_wait);
703
704
705
706
707
708 pp->pdev = NULL;
709 file->private_data = pp;
710
711 return 0;
712}
713
714static int pp_release(struct inode *inode, struct file *file)
715{
716 unsigned int minor = iminor(inode);
717 struct pp_struct *pp = file->private_data;
718 int compat_negot;
719
720 compat_negot = 0;
721 if (!(pp->flags & PP_CLAIMED) && pp->pdev &&
722 (pp->state.mode != IEEE1284_MODE_COMPAT)) {
723 struct ieee1284_info *info;
724
725
726 parport_claim_or_block(pp->pdev);
727 pp->flags |= PP_CLAIMED;
728 info = &pp->pdev->port->ieee1284;
729 pp->saved_state.mode = info->mode;
730 pp->saved_state.phase = info->phase;
731 info->mode = pp->state.mode;
732 info->phase = pp->state.phase;
733 compat_negot = 1;
734 } else if ((pp->flags & PP_CLAIMED) && pp->pdev &&
735 (pp->pdev->port->ieee1284.mode != IEEE1284_MODE_COMPAT)) {
736 compat_negot = 2;
737 }
738 if (compat_negot) {
739 parport_negotiate(pp->pdev->port, IEEE1284_MODE_COMPAT);
740 dev_dbg(&pp->pdev->dev,
741 "negotiated back to compatibility mode because user-space forgot\n");
742 }
743
744 if (pp->flags & PP_CLAIMED) {
745 struct ieee1284_info *info;
746
747 info = &pp->pdev->port->ieee1284;
748 pp->state.mode = info->mode;
749 pp->state.phase = info->phase;
750 info->mode = pp->saved_state.mode;
751 info->phase = pp->saved_state.phase;
752 parport_release(pp->pdev);
753 if (compat_negot != 1) {
754 pr_debug(CHRDEV "%x: released pardevice "
755 "because user-space forgot\n", minor);
756 }
757 }
758
759 if (pp->pdev) {
760 parport_unregister_device(pp->pdev);
761 ida_simple_remove(&ida_index, pp->index);
762 pp->pdev = NULL;
763 pr_debug(CHRDEV "%x: unregistered pardevice\n", minor);
764 }
765
766 kfree(pp);
767
768 return 0;
769}
770
771
772static unsigned int pp_poll(struct file *file, poll_table *wait)
773{
774 struct pp_struct *pp = file->private_data;
775 unsigned int mask = 0;
776
777 poll_wait(file, &pp->irq_wait, wait);
778 if (atomic_read(&pp->irqc))
779 mask |= POLLIN | POLLRDNORM;
780
781 return mask;
782}
783
784static struct class *ppdev_class;
785
786static const struct file_operations pp_fops = {
787 .owner = THIS_MODULE,
788 .llseek = no_llseek,
789 .read = pp_read,
790 .write = pp_write,
791 .poll = pp_poll,
792 .unlocked_ioctl = pp_ioctl,
793#ifdef CONFIG_COMPAT
794 .compat_ioctl = pp_compat_ioctl,
795#endif
796 .open = pp_open,
797 .release = pp_release,
798};
799
800static void pp_attach(struct parport *port)
801{
802 struct device *ret;
803
804 if (devices[port->number])
805 return;
806
807 ret = device_create(ppdev_class, port->dev,
808 MKDEV(PP_MAJOR, port->number), NULL,
809 "parport%d", port->number);
810 if (IS_ERR(ret)) {
811 pr_err("Failed to create device parport%d\n",
812 port->number);
813 return;
814 }
815 devices[port->number] = ret;
816}
817
818static void pp_detach(struct parport *port)
819{
820 if (!devices[port->number])
821 return;
822
823 device_destroy(ppdev_class, MKDEV(PP_MAJOR, port->number));
824 devices[port->number] = NULL;
825}
826
827static int pp_probe(struct pardevice *par_dev)
828{
829 struct device_driver *drv = par_dev->dev.driver;
830 int len = strlen(drv->name);
831
832 if (strncmp(par_dev->name, drv->name, len))
833 return -ENODEV;
834
835 return 0;
836}
837
838static struct parport_driver pp_driver = {
839 .name = CHRDEV,
840 .probe = pp_probe,
841 .match_port = pp_attach,
842 .detach = pp_detach,
843 .devmodel = true,
844};
845
846static int __init ppdev_init(void)
847{
848 int err = 0;
849
850 if (register_chrdev(PP_MAJOR, CHRDEV, &pp_fops)) {
851 pr_warn(CHRDEV ": unable to get major %d\n", PP_MAJOR);
852 return -EIO;
853 }
854 ppdev_class = class_create(THIS_MODULE, CHRDEV);
855 if (IS_ERR(ppdev_class)) {
856 err = PTR_ERR(ppdev_class);
857 goto out_chrdev;
858 }
859 err = parport_register_driver(&pp_driver);
860 if (err < 0) {
861 pr_warn(CHRDEV ": unable to register with parport\n");
862 goto out_class;
863 }
864
865 pr_info(PP_VERSION "\n");
866 goto out;
867
868out_class:
869 class_destroy(ppdev_class);
870out_chrdev:
871 unregister_chrdev(PP_MAJOR, CHRDEV);
872out:
873 return err;
874}
875
876static void __exit ppdev_cleanup(void)
877{
878
879 parport_unregister_driver(&pp_driver);
880 class_destroy(ppdev_class);
881 unregister_chrdev(PP_MAJOR, CHRDEV);
882}
883
884module_init(ppdev_init);
885module_exit(ppdev_cleanup);
886
887MODULE_LICENSE("GPL");
888MODULE_ALIAS_CHARDEV_MAJOR(PP_MAJOR);
889
