ia64/linux-2.6.18-xen.hg

view drivers/char/ppdev.c @ 893:f994bfe9b93b

linux/blktap2: reduce TLB flush scope

c/s 885 added very coarse TLB flushing. Since these flushes always
follow single page updates, single page flushes (when available) are
sufficient.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
author Keir Fraser <keir.fraser@citrix.com>
date Thu Jun 04 10:32:57 2009 +0100 (2009-06-04)
parents 831230e53067
children
line source
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 */
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/smp_lock.h>
70 #include <linux/device.h>
71 #include <asm/uaccess.h>
73 #define PP_VERSION "ppdev: user-space parallel port driver"
74 #define CHRDEV "ppdev"
76 struct pp_struct {
77 struct pardevice * pdev;
78 wait_queue_head_t irq_wait;
79 atomic_t irqc;
80 unsigned int flags;
81 int irqresponse;
82 unsigned char irqctl;
83 struct ieee1284_info state;
84 struct ieee1284_info saved_state;
85 long default_inactivity;
86 };
88 /* pp_struct.flags bitfields */
89 #define PP_CLAIMED (1<<0)
90 #define PP_EXCL (1<<1)
92 /* Other constants */
93 #define PP_INTERRUPT_TIMEOUT (10 * HZ) /* 10s */
94 #define PP_BUFFER_SIZE 1024
95 #define PARDEVICE_MAX 8
97 /* ROUND_UP macro from fs/select.c */
98 #define ROUND_UP(x,y) (((x)+(y)-1)/(y))
100 static inline void pp_enable_irq (struct pp_struct *pp)
101 {
102 struct parport *port = pp->pdev->port;
103 port->ops->enable_irq (port);
104 }
106 static ssize_t pp_read (struct file * file, char __user * buf, size_t count,
107 loff_t * ppos)
108 {
109 unsigned int minor = iminor(file->f_dentry->d_inode);
110 struct pp_struct *pp = file->private_data;
111 char * kbuffer;
112 ssize_t bytes_read = 0;
113 struct parport *pport;
114 int mode;
116 if (!(pp->flags & PP_CLAIMED)) {
117 /* Don't have the port claimed */
118 printk (KERN_DEBUG CHRDEV "%x: claim the port first\n",
119 minor);
120 return -EINVAL;
121 }
123 /* Trivial case. */
124 if (count == 0)
125 return 0;
127 kbuffer = kmalloc(min_t(size_t, count, PP_BUFFER_SIZE), GFP_KERNEL);
128 if (!kbuffer) {
129 return -ENOMEM;
130 }
131 pport = pp->pdev->port;
132 mode = pport->ieee1284.mode & ~(IEEE1284_DEVICEID | IEEE1284_ADDR);
134 parport_set_timeout (pp->pdev,
135 (file->f_flags & O_NONBLOCK) ?
136 PARPORT_INACTIVITY_O_NONBLOCK :
137 pp->default_inactivity);
139 while (bytes_read == 0) {
140 ssize_t need = min_t(unsigned long, count, PP_BUFFER_SIZE);
142 if (mode == IEEE1284_MODE_EPP) {
143 /* various specials for EPP mode */
144 int flags = 0;
145 size_t (*fn)(struct parport *, void *, size_t, int);
147 if (pp->flags & PP_W91284PIC) {
148 flags |= PARPORT_W91284PIC;
149 }
150 if (pp->flags & PP_FASTREAD) {
151 flags |= PARPORT_EPP_FAST;
152 }
153 if (pport->ieee1284.mode & IEEE1284_ADDR) {
154 fn = pport->ops->epp_read_addr;
155 } else {
156 fn = pport->ops->epp_read_data;
157 }
158 bytes_read = (*fn)(pport, kbuffer, need, flags);
159 } else {
160 bytes_read = parport_read (pport, kbuffer, need);
161 }
163 if (bytes_read != 0)
164 break;
166 if (file->f_flags & O_NONBLOCK) {
167 bytes_read = -EAGAIN;
168 break;
169 }
171 if (signal_pending (current)) {
172 bytes_read = -ERESTARTSYS;
173 break;
174 }
176 cond_resched();
177 }
179 parport_set_timeout (pp->pdev, pp->default_inactivity);
181 if (bytes_read > 0 && copy_to_user (buf, kbuffer, bytes_read))
182 bytes_read = -EFAULT;
184 kfree (kbuffer);
185 pp_enable_irq (pp);
186 return bytes_read;
187 }
189 static ssize_t pp_write (struct file * file, const char __user * buf,
190 size_t count, loff_t * ppos)
191 {
192 unsigned int minor = iminor(file->f_dentry->d_inode);
193 struct pp_struct *pp = file->private_data;
194 char * kbuffer;
195 ssize_t bytes_written = 0;
196 ssize_t wrote;
197 int mode;
198 struct parport *pport;
200 if (!(pp->flags & PP_CLAIMED)) {
201 /* Don't have the port claimed */
202 printk (KERN_DEBUG CHRDEV "%x: claim the port first\n",
203 minor);
204 return -EINVAL;
205 }
207 kbuffer = kmalloc(min_t(size_t, count, PP_BUFFER_SIZE), GFP_KERNEL);
208 if (!kbuffer) {
209 return -ENOMEM;
210 }
211 pport = pp->pdev->port;
212 mode = pport->ieee1284.mode & ~(IEEE1284_DEVICEID | IEEE1284_ADDR);
214 parport_set_timeout (pp->pdev,
215 (file->f_flags & O_NONBLOCK) ?
216 PARPORT_INACTIVITY_O_NONBLOCK :
217 pp->default_inactivity);
219 while (bytes_written < count) {
220 ssize_t n = min_t(unsigned long, count - bytes_written, PP_BUFFER_SIZE);
222 if (copy_from_user (kbuffer, buf + bytes_written, n)) {
223 bytes_written = -EFAULT;
224 break;
225 }
227 if ((pp->flags & PP_FASTWRITE) && (mode == IEEE1284_MODE_EPP)) {
228 /* do a fast EPP write */
229 if (pport->ieee1284.mode & IEEE1284_ADDR) {
230 wrote = pport->ops->epp_write_addr (pport,
231 kbuffer, n, PARPORT_EPP_FAST);
232 } else {
233 wrote = pport->ops->epp_write_data (pport,
234 kbuffer, n, PARPORT_EPP_FAST);
235 }
236 } else {
237 wrote = parport_write (pp->pdev->port, kbuffer, n);
238 }
240 if (wrote <= 0) {
241 if (!bytes_written) {
242 bytes_written = wrote;
243 }
244 break;
245 }
247 bytes_written += wrote;
249 if (file->f_flags & O_NONBLOCK) {
250 if (!bytes_written)
251 bytes_written = -EAGAIN;
252 break;
253 }
255 if (signal_pending (current)) {
256 if (!bytes_written) {
257 bytes_written = -EINTR;
258 }
259 break;
260 }
262 cond_resched();
263 }
265 parport_set_timeout (pp->pdev, pp->default_inactivity);
267 kfree (kbuffer);
268 pp_enable_irq (pp);
269 return bytes_written;
270 }
272 static void pp_irq (int irq, void * private, struct pt_regs * unused)
273 {
274 struct pp_struct * pp = (struct pp_struct *) private;
276 if (pp->irqresponse) {
277 parport_write_control (pp->pdev->port, pp->irqctl);
278 pp->irqresponse = 0;
279 }
281 atomic_inc (&pp->irqc);
282 wake_up_interruptible (&pp->irq_wait);
283 }
285 static int register_device (int minor, struct pp_struct *pp)
286 {
287 struct parport *port;
288 struct pardevice * pdev = NULL;
289 char *name;
290 int fl;
292 name = kmalloc (strlen (CHRDEV) + 3, GFP_KERNEL);
293 if (name == NULL)
294 return -ENOMEM;
296 sprintf (name, CHRDEV "%x", minor);
298 port = parport_find_number (minor);
299 if (!port) {
300 printk (KERN_WARNING "%s: no associated port!\n", name);
301 kfree (name);
302 return -ENXIO;
303 }
305 fl = (pp->flags & PP_EXCL) ? PARPORT_FLAG_EXCL : 0;
306 pdev = parport_register_device (port, name, NULL,
307 NULL, pp_irq, fl, pp);
308 parport_put_port (port);
310 if (!pdev) {
311 printk (KERN_WARNING "%s: failed to register device!\n", name);
312 kfree (name);
313 return -ENXIO;
314 }
316 pp->pdev = pdev;
317 printk (KERN_DEBUG "%s: registered pardevice\n", name);
318 return 0;
319 }
321 static enum ieee1284_phase init_phase (int mode)
322 {
323 switch (mode & ~(IEEE1284_DEVICEID
324 | IEEE1284_ADDR)) {
325 case IEEE1284_MODE_NIBBLE:
326 case IEEE1284_MODE_BYTE:
327 return IEEE1284_PH_REV_IDLE;
328 }
329 return IEEE1284_PH_FWD_IDLE;
330 }
332 static int pp_ioctl(struct inode *inode, struct file *file,
333 unsigned int cmd, unsigned long arg)
334 {
335 unsigned int minor = iminor(inode);
336 struct pp_struct *pp = file->private_data;
337 struct parport * port;
338 void __user *argp = (void __user *)arg;
340 /* First handle the cases that don't take arguments. */
341 switch (cmd) {
342 case PPCLAIM:
343 {
344 struct ieee1284_info *info;
345 int ret;
347 if (pp->flags & PP_CLAIMED) {
348 printk (KERN_DEBUG CHRDEV
349 "%x: you've already got it!\n", minor);
350 return -EINVAL;
351 }
353 /* Deferred device registration. */
354 if (!pp->pdev) {
355 int err = register_device (minor, pp);
356 if (err) {
357 return err;
358 }
359 }
361 ret = parport_claim_or_block (pp->pdev);
362 if (ret < 0)
363 return ret;
365 pp->flags |= PP_CLAIMED;
367 /* For interrupt-reporting to work, we need to be
368 * informed of each interrupt. */
369 pp_enable_irq (pp);
371 /* We may need to fix up the state machine. */
372 info = &pp->pdev->port->ieee1284;
373 pp->saved_state.mode = info->mode;
374 pp->saved_state.phase = info->phase;
375 info->mode = pp->state.mode;
376 info->phase = pp->state.phase;
377 pp->default_inactivity = parport_set_timeout (pp->pdev, 0);
378 parport_set_timeout (pp->pdev, pp->default_inactivity);
380 return 0;
381 }
382 case PPEXCL:
383 if (pp->pdev) {
384 printk (KERN_DEBUG CHRDEV "%x: too late for PPEXCL; "
385 "already registered\n", minor);
386 if (pp->flags & PP_EXCL)
387 /* But it's not really an error. */
388 return 0;
389 /* There's no chance of making the driver happy. */
390 return -EINVAL;
391 }
393 /* Just remember to register the device exclusively
394 * when we finally do the registration. */
395 pp->flags |= PP_EXCL;
396 return 0;
397 case PPSETMODE:
398 {
399 int mode;
400 if (copy_from_user (&mode, argp, sizeof (mode)))
401 return -EFAULT;
402 /* FIXME: validate mode */
403 pp->state.mode = mode;
404 pp->state.phase = init_phase (mode);
406 if (pp->flags & PP_CLAIMED) {
407 pp->pdev->port->ieee1284.mode = mode;
408 pp->pdev->port->ieee1284.phase = pp->state.phase;
409 }
411 return 0;
412 }
413 case PPGETMODE:
414 {
415 int mode;
417 if (pp->flags & PP_CLAIMED) {
418 mode = pp->pdev->port->ieee1284.mode;
419 } else {
420 mode = pp->state.mode;
421 }
422 if (copy_to_user (argp, &mode, sizeof (mode))) {
423 return -EFAULT;
424 }
425 return 0;
426 }
427 case PPSETPHASE:
428 {
429 int phase;
430 if (copy_from_user (&phase, argp, sizeof (phase))) {
431 return -EFAULT;
432 }
433 /* FIXME: validate phase */
434 pp->state.phase = phase;
436 if (pp->flags & PP_CLAIMED) {
437 pp->pdev->port->ieee1284.phase = phase;
438 }
440 return 0;
441 }
442 case PPGETPHASE:
443 {
444 int phase;
446 if (pp->flags & PP_CLAIMED) {
447 phase = pp->pdev->port->ieee1284.phase;
448 } else {
449 phase = pp->state.phase;
450 }
451 if (copy_to_user (argp, &phase, sizeof (phase))) {
452 return -EFAULT;
453 }
454 return 0;
455 }
456 case PPGETMODES:
457 {
458 unsigned int modes;
460 port = parport_find_number (minor);
461 if (!port)
462 return -ENODEV;
464 modes = port->modes;
465 if (copy_to_user (argp, &modes, sizeof (modes))) {
466 return -EFAULT;
467 }
468 return 0;
469 }
470 case PPSETFLAGS:
471 {
472 int uflags;
474 if (copy_from_user (&uflags, argp, sizeof (uflags))) {
475 return -EFAULT;
476 }
477 pp->flags &= ~PP_FLAGMASK;
478 pp->flags |= (uflags & PP_FLAGMASK);
479 return 0;
480 }
481 case PPGETFLAGS:
482 {
483 int uflags;
485 uflags = pp->flags & PP_FLAGMASK;
486 if (copy_to_user (argp, &uflags, sizeof (uflags))) {
487 return -EFAULT;
488 }
489 return 0;
490 }
491 } /* end switch() */
493 /* Everything else requires the port to be claimed, so check
494 * that now. */
495 if ((pp->flags & PP_CLAIMED) == 0) {
496 printk (KERN_DEBUG CHRDEV "%x: claim the port first\n",
497 minor);
498 return -EINVAL;
499 }
501 port = pp->pdev->port;
502 switch (cmd) {
503 struct ieee1284_info *info;
504 unsigned char reg;
505 unsigned char mask;
506 int mode;
507 int ret;
508 struct timeval par_timeout;
509 long to_jiffies;
511 case PPRSTATUS:
512 reg = parport_read_status (port);
513 if (copy_to_user (argp, &reg, sizeof (reg)))
514 return -EFAULT;
515 return 0;
516 case PPRDATA:
517 reg = parport_read_data (port);
518 if (copy_to_user (argp, &reg, sizeof (reg)))
519 return -EFAULT;
520 return 0;
521 case PPRCONTROL:
522 reg = parport_read_control (port);
523 if (copy_to_user (argp, &reg, sizeof (reg)))
524 return -EFAULT;
525 return 0;
526 case PPYIELD:
527 parport_yield_blocking (pp->pdev);
528 return 0;
530 case PPRELEASE:
531 /* Save the state machine's state. */
532 info = &pp->pdev->port->ieee1284;
533 pp->state.mode = info->mode;
534 pp->state.phase = info->phase;
535 info->mode = pp->saved_state.mode;
536 info->phase = pp->saved_state.phase;
537 parport_release (pp->pdev);
538 pp->flags &= ~PP_CLAIMED;
539 return 0;
541 case PPWCONTROL:
542 if (copy_from_user (&reg, argp, sizeof (reg)))
543 return -EFAULT;
544 parport_write_control (port, reg);
545 return 0;
547 case PPWDATA:
548 if (copy_from_user (&reg, argp, sizeof (reg)))
549 return -EFAULT;
550 parport_write_data (port, reg);
551 return 0;
553 case PPFCONTROL:
554 if (copy_from_user (&mask, argp,
555 sizeof (mask)))
556 return -EFAULT;
557 if (copy_from_user (&reg, 1 + (unsigned char __user *) arg,
558 sizeof (reg)))
559 return -EFAULT;
560 parport_frob_control (port, mask, reg);
561 return 0;
563 case PPDATADIR:
564 if (copy_from_user (&mode, argp, sizeof (mode)))
565 return -EFAULT;
566 if (mode)
567 port->ops->data_reverse (port);
568 else
569 port->ops->data_forward (port);
570 return 0;
572 case PPNEGOT:
573 if (copy_from_user (&mode, argp, sizeof (mode)))
574 return -EFAULT;
575 switch ((ret = parport_negotiate (port, mode))) {
576 case 0: break;
577 case -1: /* handshake failed, peripheral not IEEE 1284 */
578 ret = -EIO;
579 break;
580 case 1: /* handshake succeeded, peripheral rejected mode */
581 ret = -ENXIO;
582 break;
583 }
584 pp_enable_irq (pp);
585 return ret;
587 case PPWCTLONIRQ:
588 if (copy_from_user (&reg, argp, sizeof (reg)))
589 return -EFAULT;
591 /* Remember what to set the control lines to, for next
592 * time we get an interrupt. */
593 pp->irqctl = reg;
594 pp->irqresponse = 1;
595 return 0;
597 case PPCLRIRQ:
598 ret = atomic_read (&pp->irqc);
599 if (copy_to_user (argp, &ret, sizeof (ret)))
600 return -EFAULT;
601 atomic_sub (ret, &pp->irqc);
602 return 0;
604 case PPSETTIME:
605 if (copy_from_user (&par_timeout, argp, sizeof(struct timeval))) {
606 return -EFAULT;
607 }
608 /* Convert to jiffies, place in pp->pdev->timeout */
609 if ((par_timeout.tv_sec < 0) || (par_timeout.tv_usec < 0)) {
610 return -EINVAL;
611 }
612 to_jiffies = ROUND_UP(par_timeout.tv_usec, 1000000/HZ);
613 to_jiffies += par_timeout.tv_sec * (long)HZ;
614 if (to_jiffies <= 0) {
615 return -EINVAL;
616 }
617 pp->pdev->timeout = to_jiffies;
618 return 0;
620 case PPGETTIME:
621 to_jiffies = pp->pdev->timeout;
622 par_timeout.tv_sec = to_jiffies / HZ;
623 par_timeout.tv_usec = (to_jiffies % (long)HZ) * (1000000/HZ);
624 if (copy_to_user (argp, &par_timeout, sizeof(struct timeval)))
625 return -EFAULT;
626 return 0;
628 default:
629 printk (KERN_DEBUG CHRDEV "%x: What? (cmd=0x%x)\n", minor,
630 cmd);
631 return -EINVAL;
632 }
634 /* Keep the compiler happy */
635 return 0;
636 }
638 static int pp_open (struct inode * inode, struct file * file)
639 {
640 unsigned int minor = iminor(inode);
641 struct pp_struct *pp;
643 if (minor >= PARPORT_MAX)
644 return -ENXIO;
646 pp = kmalloc (sizeof (struct pp_struct), GFP_KERNEL);
647 if (!pp)
648 return -ENOMEM;
650 pp->state.mode = IEEE1284_MODE_COMPAT;
651 pp->state.phase = init_phase (pp->state.mode);
652 pp->flags = 0;
653 pp->irqresponse = 0;
654 atomic_set (&pp->irqc, 0);
655 init_waitqueue_head (&pp->irq_wait);
657 /* Defer the actual device registration until the first claim.
658 * That way, we know whether or not the driver wants to have
659 * exclusive access to the port (PPEXCL).
660 */
661 pp->pdev = NULL;
662 file->private_data = pp;
664 return 0;
665 }
667 static int pp_release (struct inode * inode, struct file * file)
668 {
669 unsigned int minor = iminor(inode);
670 struct pp_struct *pp = file->private_data;
671 int compat_negot;
673 compat_negot = 0;
674 if (!(pp->flags & PP_CLAIMED) && pp->pdev &&
675 (pp->state.mode != IEEE1284_MODE_COMPAT)) {
676 struct ieee1284_info *info;
678 /* parport released, but not in compatibility mode */
679 parport_claim_or_block (pp->pdev);
680 pp->flags |= PP_CLAIMED;
681 info = &pp->pdev->port->ieee1284;
682 pp->saved_state.mode = info->mode;
683 pp->saved_state.phase = info->phase;
684 info->mode = pp->state.mode;
685 info->phase = pp->state.phase;
686 compat_negot = 1;
687 } else if ((pp->flags & PP_CLAIMED) && pp->pdev &&
688 (pp->pdev->port->ieee1284.mode != IEEE1284_MODE_COMPAT)) {
689 compat_negot = 2;
690 }
691 if (compat_negot) {
692 parport_negotiate (pp->pdev->port, IEEE1284_MODE_COMPAT);
693 printk (KERN_DEBUG CHRDEV
694 "%x: negotiated back to compatibility mode because "
695 "user-space forgot\n", minor);
696 }
698 if (pp->flags & PP_CLAIMED) {
699 struct ieee1284_info *info;
701 info = &pp->pdev->port->ieee1284;
702 pp->state.mode = info->mode;
703 pp->state.phase = info->phase;
704 info->mode = pp->saved_state.mode;
705 info->phase = pp->saved_state.phase;
706 parport_release (pp->pdev);
707 if (compat_negot != 1) {
708 printk (KERN_DEBUG CHRDEV "%x: released pardevice "
709 "because user-space forgot\n", minor);
710 }
711 }
713 if (pp->pdev) {
714 const char *name = pp->pdev->name;
715 parport_unregister_device (pp->pdev);
716 kfree (name);
717 pp->pdev = NULL;
718 printk (KERN_DEBUG CHRDEV "%x: unregistered pardevice\n",
719 minor);
720 }
722 kfree (pp);
724 return 0;
725 }
727 /* No kernel lock held - fine */
728 static unsigned int pp_poll (struct file * file, poll_table * wait)
729 {
730 struct pp_struct *pp = file->private_data;
731 unsigned int mask = 0;
733 poll_wait (file, &pp->irq_wait, wait);
734 if (atomic_read (&pp->irqc))
735 mask |= POLLIN | POLLRDNORM;
737 return mask;
738 }
740 static struct class *ppdev_class;
742 static const struct file_operations pp_fops = {
743 .owner = THIS_MODULE,
744 .llseek = no_llseek,
745 .read = pp_read,
746 .write = pp_write,
747 .poll = pp_poll,
748 .ioctl = pp_ioctl,
749 .open = pp_open,
750 .release = pp_release,
751 };
753 static void pp_attach(struct parport *port)
754 {
755 class_device_create(ppdev_class, NULL, MKDEV(PP_MAJOR, port->number),
756 NULL, "parport%d", port->number);
757 }
759 static void pp_detach(struct parport *port)
760 {
761 class_device_destroy(ppdev_class, MKDEV(PP_MAJOR, port->number));
762 }
764 static struct parport_driver pp_driver = {
765 .name = CHRDEV,
766 .attach = pp_attach,
767 .detach = pp_detach,
768 };
770 static int __init ppdev_init (void)
771 {
772 int err = 0;
774 if (register_chrdev (PP_MAJOR, CHRDEV, &pp_fops)) {
775 printk (KERN_WARNING CHRDEV ": unable to get major %d\n",
776 PP_MAJOR);
777 return -EIO;
778 }
779 ppdev_class = class_create(THIS_MODULE, CHRDEV);
780 if (IS_ERR(ppdev_class)) {
781 err = PTR_ERR(ppdev_class);
782 goto out_chrdev;
783 }
784 if (parport_register_driver(&pp_driver)) {
785 printk (KERN_WARNING CHRDEV ": unable to register with parport\n");
786 goto out_class;
787 }
789 printk (KERN_INFO PP_VERSION "\n");
790 goto out;
792 out_class:
793 class_destroy(ppdev_class);
794 out_chrdev:
795 unregister_chrdev(PP_MAJOR, CHRDEV);
796 out:
797 return err;
798 }
800 static void __exit ppdev_cleanup (void)
801 {
802 /* Clean up all parport stuff */
803 parport_unregister_driver(&pp_driver);
804 class_destroy(ppdev_class);
805 unregister_chrdev (PP_MAJOR, CHRDEV);
806 }
808 module_init(ppdev_init);
809 module_exit(ppdev_cleanup);
811 MODULE_LICENSE("GPL");
812 MODULE_ALIAS_CHARDEV_MAJOR(PP_MAJOR);