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x86, apic: Fix spurious error interrupts triggering on all non-boot APs
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / char / ppdev.c
blob432655bcb04c138f7446d3d1bb08e76cba0f3b51
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/smp_lock.h>
70 #include <linux/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 pr_debug(CHRDEV "%x: claim the port first\n", minor);
118 return -EINVAL;
119 }
120
121 /* Trivial case. */
122 if (count == 0)
123 return 0;
124
125 kbuffer = kmalloc(min_t(size_t, count, PP_BUFFER_SIZE), GFP_KERNEL);
126 if (!kbuffer) {
127 return -ENOMEM;
128 }
129 pport = pp->pdev->port;
130 mode = pport->ieee1284.mode & ~(IEEE1284_DEVICEID | IEEE1284_ADDR);
131
132 parport_set_timeout (pp->pdev,
133 (file->f_flags & O_NONBLOCK) ?
134 PARPORT_INACTIVITY_O_NONBLOCK :
135 pp->default_inactivity);
136
137 while (bytes_read == 0) {
138 ssize_t need = min_t(unsigned long, count, PP_BUFFER_SIZE);
139
140 if (mode == IEEE1284_MODE_EPP) {
141 /* various specials for EPP mode */
142 int flags = 0;
143 size_t (*fn)(struct parport *, void *, size_t, int);
144
145 if (pp->flags & PP_W91284PIC) {
146 flags |= PARPORT_W91284PIC;
147 }
148 if (pp->flags & PP_FASTREAD) {
149 flags |= PARPORT_EPP_FAST;
150 }
151 if (pport->ieee1284.mode & IEEE1284_ADDR) {
152 fn = pport->ops->epp_read_addr;
153 } else {
154 fn = pport->ops->epp_read_data;
155 }
156 bytes_read = (*fn)(pport, kbuffer, need, flags);
157 } else {
158 bytes_read = parport_read (pport, kbuffer, need);
159 }
160
161 if (bytes_read != 0)
162 break;
163
164 if (file->f_flags & O_NONBLOCK) {
165 bytes_read = -EAGAIN;
166 break;
167 }
168
169 if (signal_pending (current)) {
170 bytes_read = -ERESTARTSYS;
171 break;
172 }
173
174 cond_resched();
175 }
176
177 parport_set_timeout (pp->pdev, pp->default_inactivity);
178
179 if (bytes_read > 0 && copy_to_user (buf, kbuffer, bytes_read))
180 bytes_read = -EFAULT;
181
182 kfree (kbuffer);
183 pp_enable_irq (pp);
184 return bytes_read;
185 }
186
187 static ssize_t pp_write (struct file * file, const char __user * buf,
188 size_t count, loff_t * ppos)
189 {
190 unsigned int minor = iminor(file->f_path.dentry->d_inode);
191 struct pp_struct *pp = file->private_data;
192 char * kbuffer;
193 ssize_t bytes_written = 0;
194 ssize_t wrote;
195 int mode;
196 struct parport *pport;
197
198 if (!(pp->flags & PP_CLAIMED)) {
199 /* Don't have the port claimed */
200 pr_debug(CHRDEV "%x: claim the port first\n", minor);
201 return -EINVAL;
202 }
203
204 kbuffer = kmalloc(min_t(size_t, count, PP_BUFFER_SIZE), GFP_KERNEL);
205 if (!kbuffer) {
206 return -ENOMEM;
207 }
208 pport = pp->pdev->port;
209 mode = pport->ieee1284.mode & ~(IEEE1284_DEVICEID | IEEE1284_ADDR);
210
211 parport_set_timeout (pp->pdev,
212 (file->f_flags & O_NONBLOCK) ?
213 PARPORT_INACTIVITY_O_NONBLOCK :
214 pp->default_inactivity);
215
216 while (bytes_written < count) {
217 ssize_t n = min_t(unsigned long, count - bytes_written, PP_BUFFER_SIZE);
218
219 if (copy_from_user (kbuffer, buf + bytes_written, n)) {
220 bytes_written = -EFAULT;
221 break;
222 }
223
224 if ((pp->flags & PP_FASTWRITE) && (mode == IEEE1284_MODE_EPP)) {
225 /* do a fast EPP write */
226 if (pport->ieee1284.mode & IEEE1284_ADDR) {
227 wrote = pport->ops->epp_write_addr (pport,
228 kbuffer, n, PARPORT_EPP_FAST);
229 } else {
230 wrote = pport->ops->epp_write_data (pport,
231 kbuffer, n, PARPORT_EPP_FAST);
232 }
233 } else {
234 wrote = parport_write (pp->pdev->port, kbuffer, n);
235 }
236
237 if (wrote <= 0) {
238 if (!bytes_written) {
239 bytes_written = wrote;
240 }
241 break;
242 }
243
244 bytes_written += wrote;
245
246 if (file->f_flags & O_NONBLOCK) {
247 if (!bytes_written)
248 bytes_written = -EAGAIN;
249 break;
250 }
251
252 if (signal_pending (current)) {
253 if (!bytes_written) {
254 bytes_written = -EINTR;
255 }
256 break;
257 }
258
259 cond_resched();
260 }
261
262 parport_set_timeout (pp->pdev, pp->default_inactivity);
263
264 kfree (kbuffer);
265 pp_enable_irq (pp);
266 return bytes_written;
267 }
268
269 static void pp_irq (void *private)
270 {
271 struct pp_struct *pp = private;
272
273 if (pp->irqresponse) {
274 parport_write_control (pp->pdev->port, pp->irqctl);
275 pp->irqresponse = 0;
276 }
277
278 atomic_inc (&pp->irqc);
279 wake_up_interruptible (&pp->irq_wait);
280 }
281
282 static int register_device (int minor, struct pp_struct *pp)
283 {
284 struct parport *port;
285 struct pardevice * pdev = NULL;
286 char *name;
287 int fl;
288
289 name = kmalloc (strlen (CHRDEV) + 3, GFP_KERNEL);
290 if (name == NULL)
291 return -ENOMEM;
292
293 sprintf (name, CHRDEV "%x", minor);
294
295 port = parport_find_number (minor);
296 if (!port) {
297 printk (KERN_WARNING "%s: no associated port!\n", name);
298 kfree (name);
299 return -ENXIO;
300 }
301
302 fl = (pp->flags & PP_EXCL) ? PARPORT_FLAG_EXCL : 0;
303 pdev = parport_register_device (port, name, NULL,
304 NULL, pp_irq, fl, pp);
305 parport_put_port (port);
306
307 if (!pdev) {
308 printk (KERN_WARNING "%s: failed to register device!\n", name);
309 kfree (name);
310 return -ENXIO;
311 }
312
313 pp->pdev = pdev;
314 pr_debug("%s: registered pardevice\n", name);
315 return 0;
316 }
317
318 static enum ieee1284_phase init_phase (int mode)
319 {
320 switch (mode & ~(IEEE1284_DEVICEID
321 | IEEE1284_ADDR)) {
322 case IEEE1284_MODE_NIBBLE:
323 case IEEE1284_MODE_BYTE:
324 return IEEE1284_PH_REV_IDLE;
325 }
326 return IEEE1284_PH_FWD_IDLE;
327 }
328
329 static int pp_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
330 {
331 unsigned int minor = iminor(file->f_path.dentry->d_inode);
332 struct pp_struct *pp = file->private_data;
333 struct parport * port;
334 void __user *argp = (void __user *)arg;
335
336 /* First handle the cases that don't take arguments. */
337 switch (cmd) {
338 case PPCLAIM:
339 {
340 struct ieee1284_info *info;
341 int ret;
342
343 if (pp->flags & PP_CLAIMED) {
344 pr_debug(CHRDEV "%x: you've already got it!\n", minor);
345 return -EINVAL;
346 }
347
348 /* Deferred device registration. */
349 if (!pp->pdev) {
350 int err = register_device (minor, pp);
351 if (err) {
352 return err;
353 }
354 }
355
356 ret = parport_claim_or_block (pp->pdev);
357 if (ret < 0)
358 return ret;
359
360 pp->flags |= PP_CLAIMED;
361
362 /* For interrupt-reporting to work, we need to be
363 * informed of each interrupt. */
364 pp_enable_irq (pp);
365
366 /* We may need to fix up the state machine. */
367 info = &pp->pdev->port->ieee1284;
368 pp->saved_state.mode = info->mode;
369 pp->saved_state.phase = info->phase;
370 info->mode = pp->state.mode;
371 info->phase = pp->state.phase;
372 pp->default_inactivity = parport_set_timeout (pp->pdev, 0);
373 parport_set_timeout (pp->pdev, pp->default_inactivity);
374
375 return 0;
376 }
377 case PPEXCL:
378 if (pp->pdev) {
379 pr_debug(CHRDEV "%x: too late for PPEXCL; "
380 "already registered\n", minor);
381 if (pp->flags & PP_EXCL)
382 /* But it's not really an error. */
383 return 0;
384 /* There's no chance of making the driver happy. */
385 return -EINVAL;
386 }
387
388 /* Just remember to register the device exclusively
389 * when we finally do the registration. */
390 pp->flags |= PP_EXCL;
391 return 0;
392 case PPSETMODE:
393 {
394 int mode;
395 if (copy_from_user (&mode, argp, sizeof (mode)))
396 return -EFAULT;
397 /* FIXME: validate mode */
398 pp->state.mode = mode;
399 pp->state.phase = init_phase (mode);
400
401 if (pp->flags & PP_CLAIMED) {
402 pp->pdev->port->ieee1284.mode = mode;
403 pp->pdev->port->ieee1284.phase = pp->state.phase;
404 }
405
406 return 0;
407 }
408 case PPGETMODE:
409 {
410 int mode;
411
412 if (pp->flags & PP_CLAIMED) {
413 mode = pp->pdev->port->ieee1284.mode;
414 } else {
415 mode = pp->state.mode;
416 }
417 if (copy_to_user (argp, &mode, sizeof (mode))) {
418 return -EFAULT;
419 }
420 return 0;
421 }
422 case PPSETPHASE:
423 {
424 int phase;
425 if (copy_from_user (&phase, argp, sizeof (phase))) {
426 return -EFAULT;
427 }
428 /* FIXME: validate phase */
429 pp->state.phase = phase;
430
431 if (pp->flags & PP_CLAIMED) {
432 pp->pdev->port->ieee1284.phase = phase;
433 }
434
435 return 0;
436 }
437 case PPGETPHASE:
438 {
439 int phase;
440
441 if (pp->flags & PP_CLAIMED) {
442 phase = pp->pdev->port->ieee1284.phase;
443 } else {
444 phase = pp->state.phase;
445 }
446 if (copy_to_user (argp, &phase, sizeof (phase))) {
447 return -EFAULT;
448 }
449 return 0;
450 }
451 case PPGETMODES:
452 {
453 unsigned int modes;
454
455 port = parport_find_number (minor);
456 if (!port)
457 return -ENODEV;
458
459 modes = port->modes;
460 if (copy_to_user (argp, &modes, sizeof (modes))) {
461 return -EFAULT;
462 }
463 return 0;
464 }
465 case PPSETFLAGS:
466 {
467 int uflags;
468
469 if (copy_from_user (&uflags, argp, sizeof (uflags))) {
470 return -EFAULT;
471 }
472 pp->flags &= ~PP_FLAGMASK;
473 pp->flags |= (uflags & PP_FLAGMASK);
474 return 0;
475 }
476 case PPGETFLAGS:
477 {
478 int uflags;
479
480 uflags = pp->flags & PP_FLAGMASK;
481 if (copy_to_user (argp, &uflags, sizeof (uflags))) {
482 return -EFAULT;
483 }
484 return 0;
485 }
486 } /* end switch() */
487
488 /* Everything else requires the port to be claimed, so check
489 * that now. */
490 if ((pp->flags & PP_CLAIMED) == 0) {
491 pr_debug(CHRDEV "%x: claim the port first\n", minor);
492 return -EINVAL;
493 }
494
495 port = pp->pdev->port;
496 switch (cmd) {
497 struct ieee1284_info *info;
498 unsigned char reg;
499 unsigned char mask;
500 int mode;
501 int ret;
502 struct timeval par_timeout;
503 long to_jiffies;
504
505 case PPRSTATUS:
506 reg = parport_read_status (port);
507 if (copy_to_user (argp, &reg, sizeof (reg)))
508 return -EFAULT;
509 return 0;
510 case PPRDATA:
511 reg = parport_read_data (port);
512 if (copy_to_user (argp, &reg, sizeof (reg)))
513 return -EFAULT;
514 return 0;
515 case PPRCONTROL:
516 reg = parport_read_control (port);
517 if (copy_to_user (argp, &reg, sizeof (reg)))
518 return -EFAULT;
519 return 0;
520 case PPYIELD:
521 parport_yield_blocking (pp->pdev);
522 return 0;
523
524 case PPRELEASE:
525 /* Save the state machine's state. */
526 info = &pp->pdev->port->ieee1284;
527 pp->state.mode = info->mode;
528 pp->state.phase = info->phase;
529 info->mode = pp->saved_state.mode;
530 info->phase = pp->saved_state.phase;
531 parport_release (pp->pdev);
532 pp->flags &= ~PP_CLAIMED;
533 return 0;
534
535 case PPWCONTROL:
536 if (copy_from_user (&reg, argp, sizeof (reg)))
537 return -EFAULT;
538 parport_write_control (port, reg);
539 return 0;
540
541 case PPWDATA:
542 if (copy_from_user (&reg, argp, sizeof (reg)))
543 return -EFAULT;
544 parport_write_data (port, reg);
545 return 0;
546
547 case PPFCONTROL:
548 if (copy_from_user (&mask, argp,
549 sizeof (mask)))
550 return -EFAULT;
551 if (copy_from_user (&reg, 1 + (unsigned char __user *) arg,
552 sizeof (reg)))
553 return -EFAULT;
554 parport_frob_control (port, mask, reg);
555 return 0;
556
557 case PPDATADIR:
558 if (copy_from_user (&mode, argp, sizeof (mode)))
559 return -EFAULT;
560 if (mode)
561 port->ops->data_reverse (port);
562 else
563 port->ops->data_forward (port);
564 return 0;
565
566 case PPNEGOT:
567 if (copy_from_user (&mode, argp, sizeof (mode)))
568 return -EFAULT;
569 switch ((ret = parport_negotiate (port, mode))) {
570 case 0: break;
571 case -1: /* handshake failed, peripheral not IEEE 1284 */
572 ret = -EIO;
573 break;
574 case 1: /* handshake succeeded, peripheral rejected mode */
575 ret = -ENXIO;
576 break;
577 }
578 pp_enable_irq (pp);
579 return ret;
580
581 case PPWCTLONIRQ:
582 if (copy_from_user (&reg, argp, sizeof (reg)))
583 return -EFAULT;
584
585 /* Remember what to set the control lines to, for next
586 * time we get an interrupt. */
587 pp->irqctl = reg;
588 pp->irqresponse = 1;
589 return 0;
590
591 case PPCLRIRQ:
592 ret = atomic_read (&pp->irqc);
593 if (copy_to_user (argp, &ret, sizeof (ret)))
594 return -EFAULT;
595 atomic_sub (ret, &pp->irqc);
596 return 0;
597
598 case PPSETTIME:
599 if (copy_from_user (&par_timeout, argp, sizeof(struct timeval))) {
600 return -EFAULT;
601 }
602 /* Convert to jiffies, place in pp->pdev->timeout */
603 if ((par_timeout.tv_sec < 0) || (par_timeout.tv_usec < 0)) {
604 return -EINVAL;
605 }
606 to_jiffies = ROUND_UP(par_timeout.tv_usec, 1000000/HZ);
607 to_jiffies += par_timeout.tv_sec * (long)HZ;
608 if (to_jiffies <= 0) {
609 return -EINVAL;
610 }
611 pp->pdev->timeout = to_jiffies;
612 return 0;
613
614 case PPGETTIME:
615 to_jiffies = pp->pdev->timeout;
616 par_timeout.tv_sec = to_jiffies / HZ;
617 par_timeout.tv_usec = (to_jiffies % (long)HZ) * (1000000/HZ);
618 if (copy_to_user (argp, &par_timeout, sizeof(struct timeval)))
619 return -EFAULT;
620 return 0;
621
622 default:
623 pr_debug(CHRDEV "%x: What? (cmd=0x%x)\n", minor, cmd);
624 return -EINVAL;
625 }
626
627 /* Keep the compiler happy */
628 return 0;
629 }
630
631 static long pp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
632 {
633 long ret;
634 lock_kernel();
635 ret = pp_do_ioctl(file, cmd, arg);
636 unlock_kernel();
637 return ret;
638 }
639
640 static int pp_open (struct inode * inode, struct file * file)
641 {
642 unsigned int minor = iminor(inode);
643 struct pp_struct *pp;
644
645 cycle_kernel_lock();
646 if (minor >= PARPORT_MAX)
647 return -ENXIO;
648
649 pp = kmalloc (sizeof (struct pp_struct), GFP_KERNEL);
650 if (!pp)
651 return -ENOMEM;
652
653 pp->state.mode = IEEE1284_MODE_COMPAT;
654 pp->state.phase = init_phase (pp->state.mode);
655 pp->flags = 0;
656 pp->irqresponse = 0;
657 atomic_set (&pp->irqc, 0);
658 init_waitqueue_head (&pp->irq_wait);
659
660 /* Defer the actual device registration until the first claim.
661 * That way, we know whether or not the driver wants to have
662 * exclusive access to the port (PPEXCL).
663 */
664 pp->pdev = NULL;
665 file->private_data = pp;
666
667 return 0;
668 }
669
670 static int pp_release (struct inode * inode, struct file * file)
671 {
672 unsigned int minor = iminor(inode);
673 struct pp_struct *pp = file->private_data;
674 int compat_negot;
675
676 compat_negot = 0;
677 if (!(pp->flags & PP_CLAIMED) && pp->pdev &&
678 (pp->state.mode != IEEE1284_MODE_COMPAT)) {
679 struct ieee1284_info *info;
680
681 /* parport released, but not in compatibility mode */
682 parport_claim_or_block (pp->pdev);
683 pp->flags |= PP_CLAIMED;
684 info = &pp->pdev->port->ieee1284;
685 pp->saved_state.mode = info->mode;
686 pp->saved_state.phase = info->phase;
687 info->mode = pp->state.mode;
688 info->phase = pp->state.phase;
689 compat_negot = 1;
690 } else if ((pp->flags & PP_CLAIMED) && pp->pdev &&
691 (pp->pdev->port->ieee1284.mode != IEEE1284_MODE_COMPAT)) {
692 compat_negot = 2;
693 }
694 if (compat_negot) {
695 parport_negotiate (pp->pdev->port, IEEE1284_MODE_COMPAT);
696 pr_debug(CHRDEV "%x: negotiated back to compatibility "
697 "mode because user-space forgot\n", minor);
698 }
699
700 if (pp->flags & PP_CLAIMED) {
701 struct ieee1284_info *info;
702
703 info = &pp->pdev->port->ieee1284;
704 pp->state.mode = info->mode;
705 pp->state.phase = info->phase;
706 info->mode = pp->saved_state.mode;
707 info->phase = pp->saved_state.phase;
708 parport_release (pp->pdev);
709 if (compat_negot != 1) {
710 pr_debug(CHRDEV "%x: released pardevice "
711 "because user-space forgot\n", minor);
712 }
713 }
714
715 if (pp->pdev) {
716 const char *name = pp->pdev->name;
717 parport_unregister_device (pp->pdev);
718 kfree (name);
719 pp->pdev = NULL;
720 pr_debug(CHRDEV "%x: unregistered pardevice\n", minor);
721 }
722
723 kfree (pp);
724
725 return 0;
726 }
727
728 /* No kernel lock held - fine */
729 static unsigned int pp_poll (struct file * file, poll_table * wait)
730 {
731 struct pp_struct *pp = file->private_data;
732 unsigned int mask = 0;
733
734 poll_wait (file, &pp->irq_wait, wait);
735 if (atomic_read (&pp->irqc))
736 mask |= POLLIN | POLLRDNORM;
737
738 return mask;
739 }
740
741 static struct class *ppdev_class;
742
743 static const struct file_operations pp_fops = {
744 .owner = THIS_MODULE,
745 .llseek = no_llseek,
746 .read = pp_read,
747 .write = pp_write,
748 .poll = pp_poll,
749 .unlocked_ioctl = pp_ioctl,
750 .open = pp_open,
751 .release = pp_release,
752 };
753
754 static void pp_attach(struct parport *port)
755 {
756 device_create(ppdev_class, port->dev, MKDEV(PP_MAJOR, port->number),
757 NULL, "parport%d", port->number);
758 }
759
760 static void pp_detach(struct parport *port)
761 {
762 device_destroy(ppdev_class, MKDEV(PP_MAJOR, port->number));
763 }
764
765 static struct parport_driver pp_driver = {
766 .name = CHRDEV,
767 .attach = pp_attach,
768 .detach = pp_detach,
769 };
770
771 static int __init ppdev_init (void)
772 {
773 int err = 0;
774
775 if (register_chrdev (PP_MAJOR, CHRDEV, &pp_fops)) {
776 printk (KERN_WARNING CHRDEV ": unable to get major %d\n",
777 PP_MAJOR);
778 return -EIO;
779 }
780 ppdev_class = class_create(THIS_MODULE, CHRDEV);
781 if (IS_ERR(ppdev_class)) {
782 err = PTR_ERR(ppdev_class);
783 goto out_chrdev;
784 }
785 if (parport_register_driver(&pp_driver)) {
786 printk (KERN_WARNING CHRDEV ": unable to register with parport\n");
787 goto out_class;
788 }
789
790 printk (KERN_INFO PP_VERSION "\n");
791 goto out;
792
793 out_class:
794 class_destroy(ppdev_class);
795 out_chrdev:
796 unregister_chrdev(PP_MAJOR, CHRDEV);
797 out:
798 return err;
799 }
800
801 static void __exit ppdev_cleanup (void)
802 {
803 /* Clean up all parport stuff */
804 parport_unregister_driver(&pp_driver);
805 class_destroy(ppdev_class);
806 unregister_chrdev (PP_MAJOR, CHRDEV);
807 }
808
809 module_init(ppdev_init);
810 module_exit(ppdev_cleanup);
811
812 MODULE_LICENSE("GPL");
813 MODULE_ALIAS_CHARDEV_MAJOR(PP_MAJOR);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree