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header cleaning: don't include smp_lock.h when not used
[usb.git] / drivers / char / ppdev.c
blob84ac64fc48a1a72f4d3aebbf5fffac70e2200ae1
1 /*
2 * linux/drivers/char/ppdev.c
3 *
4 * This is the code behind /dev/parport* -- it allows a user-space
5 * application to use the parport subsystem.
6 *
7 * Copyright (C) 1998-2000, 2002 Tim Waugh <tim@cyberelk.net>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 *
14 * A /dev/parportx device node represents an arbitrary device
15 * on port 'x'. The following operations are possible:
16 *
17 * open do nothing, set up default IEEE 1284 protocol to be COMPAT
18 * close release port and unregister device (if necessary)
19 * ioctl
20 * EXCL register device exclusively (may fail)
21 * CLAIM (register device first time) parport_claim_or_block
22 * RELEASE parport_release
23 * SETMODE set the IEEE 1284 protocol to use for read/write
24 * SETPHASE set the IEEE 1284 phase of a particular mode. Not to be
25 * confused with ioctl(fd, SETPHASER, &stun). ;-)
26 * DATADIR data_forward / data_reverse
27 * WDATA write_data
28 * RDATA read_data
29 * WCONTROL write_control
30 * RCONTROL read_control
31 * FCONTROL frob_control
32 * RSTATUS read_status
33 * NEGOT parport_negotiate
34 * YIELD parport_yield_blocking
35 * WCTLONIRQ on interrupt, set control lines
36 * CLRIRQ clear (and return) interrupt count
37 * SETTIME sets device timeout (struct timeval)
38 * GETTIME gets device timeout (struct timeval)
39 * GETMODES gets hardware supported modes (unsigned int)
40 * GETMODE gets the current IEEE1284 mode
41 * GETPHASE gets the current IEEE1284 phase
42 * GETFLAGS gets current (user-visible) flags
43 * SETFLAGS sets current (user-visible) flags
44 * read/write read or write in current IEEE 1284 protocol
45 * select wait for interrupt (in readfds)
46 *
47 * Changes:
48 * Added SETTIME/GETTIME ioctl, Fred Barnes, 1999.
49 *
50 * Arnaldo Carvalho de Melo <acme@conectiva.com.br> 2000/08/25
51 * - On error, copy_from_user and copy_to_user do not return -EFAULT,
52 * They return the positive number of bytes *not* copied due to address
53 * space errors.
54 *
55 * Added GETMODES/GETMODE/GETPHASE ioctls, Fred Barnes <frmb2@ukc.ac.uk>, 03/01/2001.
56 * Added GETFLAGS/SETFLAGS ioctls, Fred Barnes, 04/2001
57 */
58
59 #include <linux/module.h>
60 #include <linux/init.h>
61 #include <linux/sched.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/major.h>
68 #include <linux/ppdev.h>
69 #include <linux/device.h>
70 #include <asm/uaccess.h>
71
72 #define PP_VERSION "ppdev: user-space parallel port driver"
73 #define CHRDEV "ppdev"
74
75 struct pp_struct {
76 struct pardevice * pdev;
77 wait_queue_head_t irq_wait;
78 atomic_t irqc;
79 unsigned int flags;
80 int irqresponse;
81 unsigned char irqctl;
82 struct ieee1284_info state;
83 struct ieee1284_info saved_state;
84 long default_inactivity;
85 };
86
87 /* pp_struct.flags bitfields */
88 #define PP_CLAIMED (1<<0)
89 #define PP_EXCL (1<<1)
90
91 /* Other constants */
92 #define PP_INTERRUPT_TIMEOUT (10 * HZ) /* 10s */
93 #define PP_BUFFER_SIZE 1024
94 #define PARDEVICE_MAX 8
95
96 /* ROUND_UP macro from fs/select.c */
97 #define ROUND_UP(x,y) (((x)+(y)-1)/(y))
98
99 static inline void pp_enable_irq (struct pp_struct *pp)
100 {
101 struct parport *port = pp->pdev->port;
102 port->ops->enable_irq (port);
103 }
104
105 static ssize_t pp_read (struct file * file, char __user * buf, size_t count,
106 loff_t * ppos)
107 {
108 unsigned int minor = iminor(file->f_path.dentry->d_inode);
109 struct pp_struct *pp = file->private_data;
110 char * kbuffer;
111 ssize_t bytes_read = 0;
112 struct parport *pport;
113 int mode;
114
115 if (!(pp->flags & PP_CLAIMED)) {
116 /* Don't have the port claimed */
117 printk (KERN_DEBUG CHRDEV "%x: claim the port first\n",
118 minor);
119 return -EINVAL;
120 }
121
122 /* Trivial case. */
123 if (count == 0)
124 return 0;
125
126 kbuffer = kmalloc(min_t(size_t, count, PP_BUFFER_SIZE), GFP_KERNEL);
127 if (!kbuffer) {
128 return -ENOMEM;
129 }
130 pport = pp->pdev->port;
131 mode = pport->ieee1284.mode & ~(IEEE1284_DEVICEID | IEEE1284_ADDR);
132
133 parport_set_timeout (pp->pdev,
134 (file->f_flags & O_NONBLOCK) ?
135 PARPORT_INACTIVITY_O_NONBLOCK :
136 pp->default_inactivity);
137
138 while (bytes_read == 0) {
139 ssize_t need = min_t(unsigned long, count, PP_BUFFER_SIZE);
140
141 if (mode == IEEE1284_MODE_EPP) {
142 /* various specials for EPP mode */
143 int flags = 0;
144 size_t (*fn)(struct parport *, void *, size_t, int);
145
146 if (pp->flags & PP_W91284PIC) {
147 flags |= PARPORT_W91284PIC;
148 }
149 if (pp->flags & PP_FASTREAD) {
150 flags |= PARPORT_EPP_FAST;
151 }
152 if (pport->ieee1284.mode & IEEE1284_ADDR) {
153 fn = pport->ops->epp_read_addr;
154 } else {
155 fn = pport->ops->epp_read_data;
156 }
157 bytes_read = (*fn)(pport, kbuffer, need, flags);
158 } else {
159 bytes_read = parport_read (pport, kbuffer, need);
160 }
161
162 if (bytes_read != 0)
163 break;
164
165 if (file->f_flags & O_NONBLOCK) {
166 bytes_read = -EAGAIN;
167 break;
168 }
169
170 if (signal_pending (current)) {
171 bytes_read = -ERESTARTSYS;
172 break;
173 }
174
175 cond_resched();
176 }
177
178 parport_set_timeout (pp->pdev, pp->default_inactivity);
179
180 if (bytes_read > 0 && copy_to_user (buf, kbuffer, bytes_read))
181 bytes_read = -EFAULT;
182
183 kfree (kbuffer);
184 pp_enable_irq (pp);
185 return bytes_read;
186 }
187
188 static ssize_t pp_write (struct file * file, const char __user * buf,
189 size_t count, loff_t * ppos)
190 {
191 unsigned int minor = iminor(file->f_path.dentry->d_inode);
192 struct pp_struct *pp = file->private_data;
193 char * kbuffer;
194 ssize_t bytes_written = 0;
195 ssize_t wrote;
196 int mode;
197 struct parport *pport;
198
199 if (!(pp->flags & PP_CLAIMED)) {
200 /* Don't have the port claimed */
201 printk (KERN_DEBUG CHRDEV "%x: claim the port first\n",
202 minor);
203 return -EINVAL;
204 }
205
206 kbuffer = kmalloc(min_t(size_t, count, PP_BUFFER_SIZE), GFP_KERNEL);
207 if (!kbuffer) {
208 return -ENOMEM;
209 }
210 pport = pp->pdev->port;
211 mode = pport->ieee1284.mode & ~(IEEE1284_DEVICEID | IEEE1284_ADDR);
212
213 parport_set_timeout (pp->pdev,
214 (file->f_flags & O_NONBLOCK) ?
215 PARPORT_INACTIVITY_O_NONBLOCK :
216 pp->default_inactivity);
217
218 while (bytes_written < count) {
219 ssize_t n = min_t(unsigned long, count - bytes_written, PP_BUFFER_SIZE);
220
221 if (copy_from_user (kbuffer, buf + bytes_written, n)) {
222 bytes_written = -EFAULT;
223 break;
224 }
225
226 if ((pp->flags & PP_FASTWRITE) && (mode == IEEE1284_MODE_EPP)) {
227 /* do a fast EPP write */
228 if (pport->ieee1284.mode & IEEE1284_ADDR) {
229 wrote = pport->ops->epp_write_addr (pport,
230 kbuffer, n, PARPORT_EPP_FAST);
231 } else {
232 wrote = pport->ops->epp_write_data (pport,
233 kbuffer, n, PARPORT_EPP_FAST);
234 }
235 } else {
236 wrote = parport_write (pp->pdev->port, kbuffer, n);
237 }
238
239 if (wrote <= 0) {
240 if (!bytes_written) {
241 bytes_written = wrote;
242 }
243 break;
244 }
245
246 bytes_written += wrote;
247
248 if (file->f_flags & O_NONBLOCK) {
249 if (!bytes_written)
250 bytes_written = -EAGAIN;
251 break;
252 }
253
254 if (signal_pending (current)) {
255 if (!bytes_written) {
256 bytes_written = -EINTR;
257 }
258 break;
259 }
260
261 cond_resched();
262 }
263
264 parport_set_timeout (pp->pdev, pp->default_inactivity);
265
266 kfree (kbuffer);
267 pp_enable_irq (pp);
268 return bytes_written;
269 }
270
271 static void pp_irq (int irq, void * private)
272 {
273 struct pp_struct * pp = (struct pp_struct *) private;
274
275 if (pp->irqresponse) {
276 parport_write_control (pp->pdev->port, pp->irqctl);
277 pp->irqresponse = 0;
278 }
279
280 atomic_inc (&pp->irqc);
281 wake_up_interruptible (&pp->irq_wait);
282 }
283
284 static int register_device (int minor, struct pp_struct *pp)
285 {
286 struct parport *port;
287 struct pardevice * pdev = NULL;
288 char *name;
289 int fl;
290
291 name = kmalloc (strlen (CHRDEV) + 3, GFP_KERNEL);
292 if (name == NULL)
293 return -ENOMEM;
294
295 sprintf (name, CHRDEV "%x", minor);
296
297 port = parport_find_number (minor);
298 if (!port) {
299 printk (KERN_WARNING "%s: no associated port!\n", name);
300 kfree (name);
301 return -ENXIO;
302 }
303
304 fl = (pp->flags & PP_EXCL) ? PARPORT_FLAG_EXCL : 0;
305 pdev = parport_register_device (port, name, NULL,
306 NULL, pp_irq, fl, pp);
307 parport_put_port (port);
308
309 if (!pdev) {
310 printk (KERN_WARNING "%s: failed to register device!\n", name);
311 kfree (name);
312 return -ENXIO;
313 }
314
315 pp->pdev = pdev;
316 printk (KERN_DEBUG "%s: registered pardevice\n", name);
317 return 0;
318 }
319
320 static enum ieee1284_phase init_phase (int mode)
321 {
322 switch (mode & ~(IEEE1284_DEVICEID
323 | IEEE1284_ADDR)) {
324 case IEEE1284_MODE_NIBBLE:
325 case IEEE1284_MODE_BYTE:
326 return IEEE1284_PH_REV_IDLE;
327 }
328 return IEEE1284_PH_FWD_IDLE;
329 }
330
331 static int pp_ioctl(struct inode *inode, struct file *file,
332 unsigned int cmd, unsigned long arg)
333 {
334 unsigned int minor = iminor(inode);
335 struct pp_struct *pp = file->private_data;
336 struct parport * port;
337 void __user *argp = (void __user *)arg;
338
339 /* First handle the cases that don't take arguments. */
340 switch (cmd) {
341 case PPCLAIM:
342 {
343 struct ieee1284_info *info;
344 int ret;
345
346 if (pp->flags & PP_CLAIMED) {
347 printk (KERN_DEBUG CHRDEV
348 "%x: you've already got it!\n", minor);
349 return -EINVAL;
350 }
351
352 /* Deferred device registration. */
353 if (!pp->pdev) {
354 int err = register_device (minor, pp);
355 if (err) {
356 return err;
357 }
358 }
359
360 ret = parport_claim_or_block (pp->pdev);
361 if (ret < 0)
362 return ret;
363
364 pp->flags |= PP_CLAIMED;
365
366 /* For interrupt-reporting to work, we need to be
367 * informed of each interrupt. */
368 pp_enable_irq (pp);
369
370 /* We may need to fix up the state machine. */
371 info = &pp->pdev->port->ieee1284;
372 pp->saved_state.mode = info->mode;
373 pp->saved_state.phase = info->phase;
374 info->mode = pp->state.mode;
375 info->phase = pp->state.phase;
376 pp->default_inactivity = parport_set_timeout (pp->pdev, 0);
377 parport_set_timeout (pp->pdev, pp->default_inactivity);
378
379 return 0;
380 }
381 case PPEXCL:
382 if (pp->pdev) {
383 printk (KERN_DEBUG CHRDEV "%x: too late for PPEXCL; "
384 "already registered\n", minor);
385 if (pp->flags & PP_EXCL)
386 /* But it's not really an error. */
387 return 0;
388 /* There's no chance of making the driver happy. */
389 return -EINVAL;
390 }
391
392 /* Just remember to register the device exclusively
393 * when we finally do the registration. */
394 pp->flags |= PP_EXCL;
395 return 0;
396 case PPSETMODE:
397 {
398 int mode;
399 if (copy_from_user (&mode, argp, sizeof (mode)))
400 return -EFAULT;
401 /* FIXME: validate mode */
402 pp->state.mode = mode;
403 pp->state.phase = init_phase (mode);
404
405 if (pp->flags & PP_CLAIMED) {
406 pp->pdev->port->ieee1284.mode = mode;
407 pp->pdev->port->ieee1284.phase = pp->state.phase;
408 }
409
410 return 0;
411 }
412 case PPGETMODE:
413 {
414 int mode;
415
416 if (pp->flags & PP_CLAIMED) {
417 mode = pp->pdev->port->ieee1284.mode;
418 } else {
419 mode = pp->state.mode;
420 }
421 if (copy_to_user (argp, &mode, sizeof (mode))) {
422 return -EFAULT;
423 }
424 return 0;
425 }
426 case PPSETPHASE:
427 {
428 int phase;
429 if (copy_from_user (&phase, argp, sizeof (phase))) {
430 return -EFAULT;
431 }
432 /* FIXME: validate phase */
433 pp->state.phase = phase;
434
435 if (pp->flags & PP_CLAIMED) {
436 pp->pdev->port->ieee1284.phase = phase;
437 }
438
439 return 0;
440 }
441 case PPGETPHASE:
442 {
443 int phase;
444
445 if (pp->flags & PP_CLAIMED) {
446 phase = pp->pdev->port->ieee1284.phase;
447 } else {
448 phase = pp->state.phase;
449 }
450 if (copy_to_user (argp, &phase, sizeof (phase))) {
451 return -EFAULT;
452 }
453 return 0;
454 }
455 case PPGETMODES:
456 {
457 unsigned int modes;
458
459 port = parport_find_number (minor);
460 if (!port)
461 return -ENODEV;
462
463 modes = port->modes;
464 if (copy_to_user (argp, &modes, sizeof (modes))) {
465 return -EFAULT;
466 }
467 return 0;
468 }
469 case PPSETFLAGS:
470 {
471 int uflags;
472
473 if (copy_from_user (&uflags, argp, sizeof (uflags))) {
474 return -EFAULT;
475 }
476 pp->flags &= ~PP_FLAGMASK;
477 pp->flags |= (uflags & PP_FLAGMASK);
478 return 0;
479 }
480 case PPGETFLAGS:
481 {
482 int uflags;
483
484 uflags = pp->flags & PP_FLAGMASK;
485 if (copy_to_user (argp, &uflags, sizeof (uflags))) {
486 return -EFAULT;
487 }
488 return 0;
489 }
490 } /* end switch() */
491
492 /* Everything else requires the port to be claimed, so check
493 * that now. */
494 if ((pp->flags & PP_CLAIMED) == 0) {
495 printk (KERN_DEBUG CHRDEV "%x: claim the port first\n",
496 minor);
497 return -EINVAL;
498 }
499
500 port = pp->pdev->port;
501 switch (cmd) {
502 struct ieee1284_info *info;
503 unsigned char reg;
504 unsigned char mask;
505 int mode;
506 int ret;
507 struct timeval par_timeout;
508 long to_jiffies;
509
510 case PPRSTATUS:
511 reg = parport_read_status (port);
512 if (copy_to_user (argp, &reg, sizeof (reg)))
513 return -EFAULT;
514 return 0;
515 case PPRDATA:
516 reg = parport_read_data (port);
517 if (copy_to_user (argp, &reg, sizeof (reg)))
518 return -EFAULT;
519 return 0;
520 case PPRCONTROL:
521 reg = parport_read_control (port);
522 if (copy_to_user (argp, &reg, sizeof (reg)))
523 return -EFAULT;
524 return 0;
525 case PPYIELD:
526 parport_yield_blocking (pp->pdev);
527 return 0;
528
529 case PPRELEASE:
530 /* Save the state machine's state. */
531 info = &pp->pdev->port->ieee1284;
532 pp->state.mode = info->mode;
533 pp->state.phase = info->phase;
534 info->mode = pp->saved_state.mode;
535 info->phase = pp->saved_state.phase;
536 parport_release (pp->pdev);
537 pp->flags &= ~PP_CLAIMED;
538 return 0;
539
540 case PPWCONTROL:
541 if (copy_from_user (&reg, argp, sizeof (reg)))
542 return -EFAULT;
543 parport_write_control (port, reg);
544 return 0;
545
546 case PPWDATA:
547 if (copy_from_user (&reg, argp, sizeof (reg)))
548 return -EFAULT;
549 parport_write_data (port, reg);
550 return 0;
551
552 case PPFCONTROL:
553 if (copy_from_user (&mask, argp,
554 sizeof (mask)))
555 return -EFAULT;
556 if (copy_from_user (&reg, 1 + (unsigned char __user *) arg,
557 sizeof (reg)))
558 return -EFAULT;
559 parport_frob_control (port, mask, reg);
560 return 0;
561
562 case PPDATADIR:
563 if (copy_from_user (&mode, argp, sizeof (mode)))
564 return -EFAULT;
565 if (mode)
566 port->ops->data_reverse (port);
567 else
568 port->ops->data_forward (port);
569 return 0;
570
571 case PPNEGOT:
572 if (copy_from_user (&mode, argp, sizeof (mode)))
573 return -EFAULT;
574 switch ((ret = parport_negotiate (port, mode))) {
575 case 0: break;
576 case -1: /* handshake failed, peripheral not IEEE 1284 */
577 ret = -EIO;
578 break;
579 case 1: /* handshake succeeded, peripheral rejected mode */
580 ret = -ENXIO;
581 break;
582 }
583 pp_enable_irq (pp);
584 return ret;
585
586 case PPWCTLONIRQ:
587 if (copy_from_user (&reg, argp, sizeof (reg)))
588 return -EFAULT;
589
590 /* Remember what to set the control lines to, for next
591 * time we get an interrupt. */
592 pp->irqctl = reg;
593 pp->irqresponse = 1;
594 return 0;
595
596 case PPCLRIRQ:
597 ret = atomic_read (&pp->irqc);
598 if (copy_to_user (argp, &ret, sizeof (ret)))
599 return -EFAULT;
600 atomic_sub (ret, &pp->irqc);
601 return 0;
602
603 case PPSETTIME:
604 if (copy_from_user (&par_timeout, argp, sizeof(struct timeval))) {
605 return -EFAULT;
606 }
607 /* Convert to jiffies, place in pp->pdev->timeout */
608 if ((par_timeout.tv_sec < 0) || (par_timeout.tv_usec < 0)) {
609 return -EINVAL;
610 }
611 to_jiffies = ROUND_UP(par_timeout.tv_usec, 1000000/HZ);
612 to_jiffies += par_timeout.tv_sec * (long)HZ;
613 if (to_jiffies <= 0) {
614 return -EINVAL;
615 }
616 pp->pdev->timeout = to_jiffies;
617 return 0;
618
619 case PPGETTIME:
620 to_jiffies = pp->pdev->timeout;
621 par_timeout.tv_sec = to_jiffies / HZ;
622 par_timeout.tv_usec = (to_jiffies % (long)HZ) * (1000000/HZ);
623 if (copy_to_user (argp, &par_timeout, sizeof(struct timeval)))
624 return -EFAULT;
625 return 0;
626
627 default:
628 printk (KERN_DEBUG CHRDEV "%x: What? (cmd=0x%x)\n", minor,
629 cmd);
630 return -EINVAL;
631 }
632
633 /* Keep the compiler happy */
634 return 0;
635 }
636
637 static int pp_open (struct inode * inode, struct file * file)
638 {
639 unsigned int minor = iminor(inode);
640 struct pp_struct *pp;
641
642 if (minor >= PARPORT_MAX)
643 return -ENXIO;
644
645 pp = kmalloc (sizeof (struct pp_struct), GFP_KERNEL);
646 if (!pp)
647 return -ENOMEM;
648
649 pp->state.mode = IEEE1284_MODE_COMPAT;
650 pp->state.phase = init_phase (pp->state.mode);
651 pp->flags = 0;
652 pp->irqresponse = 0;
653 atomic_set (&pp->irqc, 0);
654 init_waitqueue_head (&pp->irq_wait);
655
656 /* Defer the actual device registration until the first claim.
657 * That way, we know whether or not the driver wants to have
658 * exclusive access to the port (PPEXCL).
659 */
660 pp->pdev = NULL;
661 file->private_data = pp;
662
663 return 0;
664 }
665
666 static int pp_release (struct inode * inode, struct file * file)
667 {
668 unsigned int minor = iminor(inode);
669 struct pp_struct *pp = file->private_data;
670 int compat_negot;
671
672 compat_negot = 0;
673 if (!(pp->flags & PP_CLAIMED) && pp->pdev &&
674 (pp->state.mode != IEEE1284_MODE_COMPAT)) {
675 struct ieee1284_info *info;
676
677 /* parport released, but not in compatibility mode */
678 parport_claim_or_block (pp->pdev);
679 pp->flags |= PP_CLAIMED;
680 info = &pp->pdev->port->ieee1284;
681 pp->saved_state.mode = info->mode;
682 pp->saved_state.phase = info->phase;
683 info->mode = pp->state.mode;
684 info->phase = pp->state.phase;
685 compat_negot = 1;
686 } else if ((pp->flags & PP_CLAIMED) && pp->pdev &&
687 (pp->pdev->port->ieee1284.mode != IEEE1284_MODE_COMPAT)) {
688 compat_negot = 2;
689 }
690 if (compat_negot) {
691 parport_negotiate (pp->pdev->port, IEEE1284_MODE_COMPAT);
692 printk (KERN_DEBUG CHRDEV
693 "%x: negotiated back to compatibility mode because "
694 "user-space forgot\n", minor);
695 }
696
697 if (pp->flags & PP_CLAIMED) {
698 struct ieee1284_info *info;
699
700 info = &pp->pdev->port->ieee1284;
701 pp->state.mode = info->mode;
702 pp->state.phase = info->phase;
703 info->mode = pp->saved_state.mode;
704 info->phase = pp->saved_state.phase;
705 parport_release (pp->pdev);
706 if (compat_negot != 1) {
707 printk (KERN_DEBUG CHRDEV "%x: released pardevice "
708 "because user-space forgot\n", minor);
709 }
710 }
711
712 if (pp->pdev) {
713 const char *name = pp->pdev->name;
714 parport_unregister_device (pp->pdev);
715 kfree (name);
716 pp->pdev = NULL;
717 printk (KERN_DEBUG CHRDEV "%x: unregistered pardevice\n",
718 minor);
719 }
720
721 kfree (pp);
722
723 return 0;
724 }
725
726 /* No kernel lock held - fine */
727 static unsigned int pp_poll (struct file * file, poll_table * wait)
728 {
729 struct pp_struct *pp = file->private_data;
730 unsigned int mask = 0;
731
732 poll_wait (file, &pp->irq_wait, wait);
733 if (atomic_read (&pp->irqc))
734 mask |= POLLIN | POLLRDNORM;
735
736 return mask;
737 }
738
739 static struct class *ppdev_class;
740
741 static const struct file_operations pp_fops = {
742 .owner = THIS_MODULE,
743 .llseek = no_llseek,
744 .read = pp_read,
745 .write = pp_write,
746 .poll = pp_poll,
747 .ioctl = pp_ioctl,
748 .open = pp_open,
749 .release = pp_release,
750 };
751
752 static void pp_attach(struct parport *port)
753 {
754 device_create(ppdev_class, port->dev, MKDEV(PP_MAJOR, port->number),
755 "parport%d", port->number);
756 }
757
758 static void pp_detach(struct parport *port)
759 {
760 device_destroy(ppdev_class, MKDEV(PP_MAJOR, port->number));
761 }
762
763 static struct parport_driver pp_driver = {
764 .name = CHRDEV,
765 .attach = pp_attach,
766 .detach = pp_detach,
767 };
768
769 static int __init ppdev_init (void)
770 {
771 int err = 0;
772
773 if (register_chrdev (PP_MAJOR, CHRDEV, &pp_fops)) {
774 printk (KERN_WARNING CHRDEV ": unable to get major %d\n",
775 PP_MAJOR);
776 return -EIO;
777 }
778 ppdev_class = class_create(THIS_MODULE, CHRDEV);
779 if (IS_ERR(ppdev_class)) {
780 err = PTR_ERR(ppdev_class);
781 goto out_chrdev;
782 }
783 if (parport_register_driver(&pp_driver)) {
784 printk (KERN_WARNING CHRDEV ": unable to register with parport\n");
785 goto out_class;
786 }
787
788 printk (KERN_INFO PP_VERSION "\n");
789 goto out;
790
791 out_class:
792 class_destroy(ppdev_class);
793 out_chrdev:
794 unregister_chrdev(PP_MAJOR, CHRDEV);
795 out:
796 return err;
797 }
798
799 static void __exit ppdev_cleanup (void)
800 {
801 /* Clean up all parport stuff */
802 parport_unregister_driver(&pp_driver);
803 class_destroy(ppdev_class);
804 unregister_chrdev (PP_MAJOR, CHRDEV);
805 }
806
807 module_init(ppdev_init);
808 module_exit(ppdev_cleanup);
809
810 MODULE_LICENSE("GPL");
811 MODULE_ALIAS_CHARDEV_MAJOR(PP_MAJOR);
USB Experimental Work