projects/linux·blob v4.6 · refs

851 lines · 19.8 KiB

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 <[email protected]>
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 <[email protected]> 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 <[email protected]>, 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/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};
88
89/* pp_struct.flags bitfields */
90#define PP_CLAIMED (1<<0)
91#define PP_EXCL (1<<1)
92
93/* Other constants */
94#define PP_INTERRUPT_TIMEOUT (10 * HZ) /* 10s */
95#define PP_BUFFER_SIZE 1024
96#define PARDEVICE_MAX 8
97
98/* ROUND_UP macro from fs/select.c */
99#define ROUND_UP(x,y) (((x)+(y)-1)/(y))
100
101static DEFINE_MUTEX(pp_do_mutex);
102
103/* define fixed sized ioctl cmd for y2038 migration */
104#define PPGETTIME32 _IOR(PP_IOCTL, 0x95, s32[2])
105#define PPSETTIME32 _IOW(PP_IOCTL, 0x96, s32[2])
106#define PPGETTIME64 _IOR(PP_IOCTL, 0x95, s64[2])
107#define PPSETTIME64 _IOW(PP_IOCTL, 0x96, s64[2])
108
109static inline void pp_enable_irq(struct pp_struct *pp)
110{
111 struct parport *port = pp->pdev->port;
112
113 port->ops->enable_irq(port);
114}
115
116static ssize_t pp_read(struct file *file, char __user *buf, size_t count,
117 loff_t *ppos)
118{
119 unsigned int minor = iminor(file_inode(file));
120 struct pp_struct *pp = file->private_data;
121 char *kbuffer;
122 ssize_t bytes_read = 0;
123 struct parport *pport;
124 int mode;
125
126 if (!(pp->flags & PP_CLAIMED)) {
127 /* Don't have the port claimed */
128 pr_debug(CHRDEV "%x: claim the port first\n", minor);
129 return -EINVAL;
130 }
131
132 /* Trivial case. */
133 if (count == 0)
134 return 0;
135
136 kbuffer = kmalloc(min_t(size_t, count, PP_BUFFER_SIZE), GFP_KERNEL);
137 if (!kbuffer)
138 return -ENOMEM;
139 pport = pp->pdev->port;
140 mode = pport->ieee1284.mode & ~(IEEE1284_DEVICEID | IEEE1284_ADDR);
141
142 parport_set_timeout(pp->pdev,
143 (file->f_flags & O_NONBLOCK) ?
144 PARPORT_INACTIVITY_O_NONBLOCK :
145 pp->default_inactivity);
146
147 while (bytes_read == 0) {
148 ssize_t need = min_t(unsigned long, count, PP_BUFFER_SIZE);
149
150 if (mode == IEEE1284_MODE_EPP) {
151 /* various specials for EPP mode */
152 int flags = 0;
153 size_t (*fn)(struct parport *, void *, size_t, int);
154
155 if (pp->flags & PP_W91284PIC)
156 flags |= PARPORT_W91284PIC;
157 if (pp->flags & PP_FASTREAD)
158 flags |= PARPORT_EPP_FAST;
159 if (pport->ieee1284.mode & IEEE1284_ADDR)
160 fn = pport->ops->epp_read_addr;
161 else
162 fn = pport->ops->epp_read_data;
163 bytes_read = (*fn)(pport, kbuffer, need, flags);
164 } else {
165 bytes_read = parport_read(pport, kbuffer, need);
166 }
167
168 if (bytes_read != 0)
169 break;
170
171 if (file->f_flags & O_NONBLOCK) {
172 bytes_read = -EAGAIN;
173 break;
174 }
175
176 if (signal_pending(current)) {
177 bytes_read = -ERESTARTSYS;
178 break;
179 }
180
181 cond_resched();
182 }
183
184 parport_set_timeout(pp->pdev, pp->default_inactivity);
185
186 if (bytes_read > 0 && copy_to_user(buf, kbuffer, bytes_read))
187 bytes_read = -EFAULT;
188
189 kfree(kbuffer);
190 pp_enable_irq(pp);
191 return bytes_read;
192}
193
194static ssize_t pp_write(struct file *file, const char __user *buf,
195 size_t count, loff_t *ppos)
196{
197 unsigned int minor = iminor(file_inode(file));
198 struct pp_struct *pp = file->private_data;
199 char *kbuffer;
200 ssize_t bytes_written = 0;
201 ssize_t wrote;
202 int mode;
203 struct parport *pport;
204
205 if (!(pp->flags & PP_CLAIMED)) {
206 /* Don't have the port claimed */
207 pr_debug(CHRDEV "%x: claim the port first\n", minor);
208 return -EINVAL;
209 }
210
211 kbuffer = kmalloc(min_t(size_t, count, PP_BUFFER_SIZE), GFP_KERNEL);
212 if (!kbuffer)
213 return -ENOMEM;
214
215 pport = pp->pdev->port;
216 mode = pport->ieee1284.mode & ~(IEEE1284_DEVICEID | IEEE1284_ADDR);
217
218 parport_set_timeout(pp->pdev,
219 (file->f_flags & O_NONBLOCK) ?
220 PARPORT_INACTIVITY_O_NONBLOCK :
221 pp->default_inactivity);
222
223 while (bytes_written < count) {
224 ssize_t n = min_t(unsigned long, count - bytes_written, PP_BUFFER_SIZE);
225
226 if (copy_from_user(kbuffer, buf + bytes_written, n)) {
227 bytes_written = -EFAULT;
228 break;
229 }
230
231 if ((pp->flags & PP_FASTWRITE) && (mode == IEEE1284_MODE_EPP)) {
232 /* do a fast EPP write */
233 if (pport->ieee1284.mode & IEEE1284_ADDR) {
234 wrote = pport->ops->epp_write_addr(pport,
235 kbuffer, n, PARPORT_EPP_FAST);
236 } else {
237 wrote = pport->ops->epp_write_data(pport,
238 kbuffer, n, PARPORT_EPP_FAST);
239 }
240 } else {
241 wrote = parport_write(pp->pdev->port, kbuffer, n);
242 }
243
244 if (wrote <= 0) {
245 if (!bytes_written)
246 bytes_written = wrote;
247 break;
248 }
249
250 bytes_written += wrote;
251
252 if (file->f_flags & O_NONBLOCK) {
253 if (!bytes_written)
254 bytes_written = -EAGAIN;
255 break;
256 }
257
258 if (signal_pending(current))
259 break;
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
271static void pp_irq(void *private)
272{
273 struct pp_struct *pp = 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
284static 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 = kasprintf(GFP_KERNEL, CHRDEV "%x", minor);
292 if (name == NULL)
293 return -ENOMEM;
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 dev_dbg(&pdev->dev, "registered pardevice\n");
315 return 0;
316}
317
318static 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
329static int pp_set_timeout(struct pardevice *pdev, long tv_sec, int tv_usec)
330{
331 long to_jiffies;
332
333 if ((tv_sec < 0) || (tv_usec < 0))
334 return -EINVAL;
335
336 to_jiffies = usecs_to_jiffies(tv_usec);
337 to_jiffies += tv_sec * HZ;
338 if (to_jiffies <= 0)
339 return -EINVAL;
340
341 pdev->timeout = to_jiffies;
342 return 0;
343}
344
345static int pp_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
346{
347 unsigned int minor = iminor(file_inode(file));
348 struct pp_struct *pp = file->private_data;
349 struct parport *port;
350 void __user *argp = (void __user *)arg;
351
352 /* First handle the cases that don't take arguments. */
353 switch (cmd) {
354 case PPCLAIM:
355 {
356 struct ieee1284_info *info;
357 int ret;
358
359 if (pp->flags & PP_CLAIMED) {
360 dev_dbg(&pp->pdev->dev, "you've already got it!\n");
361 return -EINVAL;
362 }
363
364 /* Deferred device registration. */
365 if (!pp->pdev) {
366 int err = register_device(minor, pp);
367
368 if (err)
369 return err;
370 }
371
372 ret = parport_claim_or_block(pp->pdev);
373 if (ret < 0)
374 return ret;
375
376 pp->flags |= PP_CLAIMED;
377
378 /* For interrupt-reporting to work, we need to be
379 * informed of each interrupt. */
380 pp_enable_irq(pp);
381
382 /* We may need to fix up the state machine. */
383 info = &pp->pdev->port->ieee1284;
384 pp->saved_state.mode = info->mode;
385 pp->saved_state.phase = info->phase;
386 info->mode = pp->state.mode;
387 info->phase = pp->state.phase;
388 pp->default_inactivity = parport_set_timeout(pp->pdev, 0);
389 parport_set_timeout(pp->pdev, pp->default_inactivity);
390
391 return 0;
392 }
393 case PPEXCL:
394 if (pp->pdev) {
395 dev_dbg(&pp->pdev->dev,
396 "too late for PPEXCL; already registered\n");
397 if (pp->flags & PP_EXCL)
398 /* But it's not really an error. */
399 return 0;
400 /* There's no chance of making the driver happy. */
401 return -EINVAL;
402 }
403
404 /* Just remember to register the device exclusively
405 * when we finally do the registration. */
406 pp->flags |= PP_EXCL;
407 return 0;
408 case PPSETMODE:
409 {
410 int mode;
411
412 if (copy_from_user(&mode, argp, sizeof(mode)))
413 return -EFAULT;
414 /* FIXME: validate mode */
415 pp->state.mode = mode;
416 pp->state.phase = init_phase(mode);
417
418 if (pp->flags & PP_CLAIMED) {
419 pp->pdev->port->ieee1284.mode = mode;
420 pp->pdev->port->ieee1284.phase = pp->state.phase;
421 }
422
423 return 0;
424 }
425 case PPGETMODE:
426 {
427 int mode;
428
429 if (pp->flags & PP_CLAIMED)
430 mode = pp->pdev->port->ieee1284.mode;
431 else
432 mode = pp->state.mode;
433
434 if (copy_to_user(argp, &mode, sizeof(mode)))
435 return -EFAULT;
436 return 0;
437 }
438 case PPSETPHASE:
439 {
440 int phase;
441
442 if (copy_from_user(&phase, argp, sizeof(phase)))
443 return -EFAULT;
444
445 /* FIXME: validate phase */
446 pp->state.phase = phase;
447
448 if (pp->flags & PP_CLAIMED)
449 pp->pdev->port->ieee1284.phase = phase;
450
451 return 0;
452 }
453 case PPGETPHASE:
454 {
455 int phase;
456
457 if (pp->flags & PP_CLAIMED)
458 phase = pp->pdev->port->ieee1284.phase;
459 else
460 phase = pp->state.phase;
461 if (copy_to_user(argp, &phase, sizeof(phase)))
462 return -EFAULT;
463 return 0;
464 }
465 case PPGETMODES:
466 {
467 unsigned int modes;
468
469 port = parport_find_number(minor);
470 if (!port)
471 return -ENODEV;
472
473 modes = port->modes;
474 parport_put_port(port);
475 if (copy_to_user(argp, &modes, sizeof(modes)))
476 return -EFAULT;
477 return 0;
478 }
479 case PPSETFLAGS:
480 {
481 int uflags;
482
483 if (copy_from_user(&uflags, argp, sizeof(uflags)))
484 return -EFAULT;
485 pp->flags &= ~PP_FLAGMASK;
486 pp->flags |= (uflags & PP_FLAGMASK);
487 return 0;
488 }
489 case PPGETFLAGS:
490 {
491 int uflags;
492
493 uflags = pp->flags & PP_FLAGMASK;
494 if (copy_to_user(argp, &uflags, sizeof(uflags)))
495 return -EFAULT;
496 return 0;
497 }
498 } /* end switch() */
499
500 /* Everything else requires the port to be claimed, so check
501 * that now. */
502 if ((pp->flags & PP_CLAIMED) == 0) {
503 pr_debug(CHRDEV "%x: claim the port first\n", minor);
504 return -EINVAL;
505 }
506
507 port = pp->pdev->port;
508 switch (cmd) {
509 struct ieee1284_info *info;
510 unsigned char reg;
511 unsigned char mask;
512 int mode;
513 s32 time32[2];
514 s64 time64[2];
515 struct timespec64 ts;
516 int ret;
517
518 case PPRSTATUS:
519 reg = parport_read_status(port);
520 if (copy_to_user(argp, &reg, sizeof(reg)))
521 return -EFAULT;
522 return 0;
523 case PPRDATA:
524 reg = parport_read_data(port);
525 if (copy_to_user(argp, &reg, sizeof(reg)))
526 return -EFAULT;
527 return 0;
528 case PPRCONTROL:
529 reg = parport_read_control(port);
530 if (copy_to_user(argp, &reg, sizeof(reg)))
531 return -EFAULT;
532 return 0;
533 case PPYIELD:
534 parport_yield_blocking(pp->pdev);
535 return 0;
536
537 case PPRELEASE:
538 /* Save the state machine's state. */
539 info = &pp->pdev->port->ieee1284;
540 pp->state.mode = info->mode;
541 pp->state.phase = info->phase;
542 info->mode = pp->saved_state.mode;
543 info->phase = pp->saved_state.phase;
544 parport_release(pp->pdev);
545 pp->flags &= ~PP_CLAIMED;
546 return 0;
547
548 case PPWCONTROL:
549 if (copy_from_user(&reg, argp, sizeof(reg)))
550 return -EFAULT;
551 parport_write_control(port, reg);
552 return 0;
553
554 case PPWDATA:
555 if (copy_from_user(&reg, argp, sizeof(reg)))
556 return -EFAULT;
557 parport_write_data(port, reg);
558 return 0;
559
560 case PPFCONTROL:
561 if (copy_from_user(&mask, argp,
562 sizeof(mask)))
563 return -EFAULT;
564 if (copy_from_user(&reg, 1 + (unsigned char __user *) arg,
565 sizeof(reg)))
566 return -EFAULT;
567 parport_frob_control(port, mask, reg);
568 return 0;
569
570 case PPDATADIR:
571 if (copy_from_user(&mode, argp, sizeof(mode)))
572 return -EFAULT;
573 if (mode)
574 port->ops->data_reverse(port);
575 else
576 port->ops->data_forward(port);
577 return 0;
578
579 case PPNEGOT:
580 if (copy_from_user(&mode, argp, sizeof(mode)))
581 return -EFAULT;
582 switch ((ret = parport_negotiate(port, mode))) {
583 case 0: break;
584 case -1: /* handshake failed, peripheral not IEEE 1284 */
585 ret = -EIO;
586 break;
587 case 1: /* handshake succeeded, peripheral rejected mode */
588 ret = -ENXIO;
589 break;
590 }
591 pp_enable_irq(pp);
592 return ret;
593
594 case PPWCTLONIRQ:
595 if (copy_from_user(&reg, argp, sizeof(reg)))
596 return -EFAULT;
597
598 /* Remember what to set the control lines to, for next
599 * time we get an interrupt. */
600 pp->irqctl = reg;
601 pp->irqresponse = 1;
602 return 0;
603
604 case PPCLRIRQ:
605 ret = atomic_read(&pp->irqc);
606 if (copy_to_user(argp, &ret, sizeof(ret)))
607 return -EFAULT;
608 atomic_sub(ret, &pp->irqc);
609 return 0;
610
611 case PPSETTIME32:
612 if (copy_from_user(time32, argp, sizeof(time32)))
613 return -EFAULT;
614
615 return pp_set_timeout(pp->pdev, time32[0], time32[1]);
616
617 case PPSETTIME64:
618 if (copy_from_user(time64, argp, sizeof(time64)))
619 return -EFAULT;
620
621 return pp_set_timeout(pp->pdev, time64[0], time64[1]);
622
623 case PPGETTIME32:
624 jiffies_to_timespec64(pp->pdev->timeout, &ts);
625 time32[0] = ts.tv_sec;
626 time32[1] = ts.tv_nsec / NSEC_PER_USEC;
627 if ((time32[0] < 0) || (time32[1] < 0))
628 return -EINVAL;
629
630 if (copy_to_user(argp, time32, sizeof(time32)))
631 return -EFAULT;
632
633 return 0;
634
635 case PPGETTIME64:
636 jiffies_to_timespec64(pp->pdev->timeout, &ts);
637 time64[0] = ts.tv_sec;
638 time64[1] = ts.tv_nsec / NSEC_PER_USEC;
639 if ((time64[0] < 0) || (time64[1] < 0))
640 return -EINVAL;
641
642 if (copy_to_user(argp, time64, sizeof(time64)))
643 return -EFAULT;
644
645 return 0;
646
647 default:
648 dev_dbg(&pp->pdev->dev, "What? (cmd=0x%x)\n", cmd);
649 return -EINVAL;
650 }
651
652 /* Keep the compiler happy */
653 return 0;
654}
655
656static long pp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
657{
658 long ret;
659
660 mutex_lock(&pp_do_mutex);
661 ret = pp_do_ioctl(file, cmd, arg);
662 mutex_unlock(&pp_do_mutex);
663 return ret;
664}
665
666#ifdef CONFIG_COMPAT
667static long pp_compat_ioctl(struct file *file, unsigned int cmd,
668 unsigned long arg)
669{
670 return pp_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
671}
672#endif
673
674static int pp_open(struct inode *inode, struct file *file)
675{
676 unsigned int minor = iminor(inode);
677 struct pp_struct *pp;
678
679 if (minor >= PARPORT_MAX)
680 return -ENXIO;
681
682 pp = kmalloc(sizeof(struct pp_struct), GFP_KERNEL);
683 if (!pp)
684 return -ENOMEM;
685
686 pp->state.mode = IEEE1284_MODE_COMPAT;
687 pp->state.phase = init_phase(pp->state.mode);
688 pp->flags = 0;
689 pp->irqresponse = 0;
690 atomic_set(&pp->irqc, 0);
691 init_waitqueue_head(&pp->irq_wait);
692
693 /* Defer the actual device registration until the first claim.
694 * That way, we know whether or not the driver wants to have
695 * exclusive access to the port (PPEXCL).
696 */
697 pp->pdev = NULL;
698 file->private_data = pp;
699
700 return 0;
701}
702
703static int pp_release(struct inode *inode, struct file *file)
704{
705 unsigned int minor = iminor(inode);
706 struct pp_struct *pp = file->private_data;
707 int compat_negot;
708
709 compat_negot = 0;
710 if (!(pp->flags & PP_CLAIMED) && pp->pdev &&
711 (pp->state.mode != IEEE1284_MODE_COMPAT)) {
712 struct ieee1284_info *info;
713
714 /* parport released, but not in compatibility mode */
715 parport_claim_or_block(pp->pdev);
716 pp->flags |= PP_CLAIMED;
717 info = &pp->pdev->port->ieee1284;
718 pp->saved_state.mode = info->mode;
719 pp->saved_state.phase = info->phase;
720 info->mode = pp->state.mode;
721 info->phase = pp->state.phase;
722 compat_negot = 1;
723 } else if ((pp->flags & PP_CLAIMED) && pp->pdev &&
724 (pp->pdev->port->ieee1284.mode != IEEE1284_MODE_COMPAT)) {
725 compat_negot = 2;
726 }
727 if (compat_negot) {
728 parport_negotiate(pp->pdev->port, IEEE1284_MODE_COMPAT);
729 dev_dbg(&pp->pdev->dev,
730 "negotiated back to compatibility mode because user-space forgot\n");
731 }
732
733 if (pp->flags & PP_CLAIMED) {
734 struct ieee1284_info *info;
735
736 info = &pp->pdev->port->ieee1284;
737 pp->state.mode = info->mode;
738 pp->state.phase = info->phase;
739 info->mode = pp->saved_state.mode;
740 info->phase = pp->saved_state.phase;
741 parport_release(pp->pdev);
742 if (compat_negot != 1) {
743 pr_debug(CHRDEV "%x: released pardevice "
744 "because user-space forgot\n", minor);
745 }
746 }
747
748 if (pp->pdev) {
749 const char *name = pp->pdev->name;
750
751 parport_unregister_device(pp->pdev);
752 kfree(name);
753 pp->pdev = NULL;
754 pr_debug(CHRDEV "%x: unregistered pardevice\n", minor);
755 }
756
757 kfree(pp);
758
759 return 0;
760}
761
762/* No kernel lock held - fine */
763static unsigned int pp_poll(struct file *file, poll_table *wait)
764{
765 struct pp_struct *pp = file->private_data;
766 unsigned int mask = 0;
767
768 poll_wait(file, &pp->irq_wait, wait);
769 if (atomic_read(&pp->irqc))
770 mask |= POLLIN | POLLRDNORM;
771
772 return mask;
773}
774
775static struct class *ppdev_class;
776
777static const struct file_operations pp_fops = {
778 .owner = THIS_MODULE,
779 .llseek = no_llseek,
780 .read = pp_read,
781 .write = pp_write,
782 .poll = pp_poll,
783 .unlocked_ioctl = pp_ioctl,
784#ifdef CONFIG_COMPAT
785 .compat_ioctl = pp_compat_ioctl,
786#endif
787 .open = pp_open,
788 .release = pp_release,
789};
790
791static void pp_attach(struct parport *port)
792{
793 device_create(ppdev_class, port->dev, MKDEV(PP_MAJOR, port->number),
794 NULL, "parport%d", port->number);
795}
796
797static void pp_detach(struct parport *port)
798{
799 device_destroy(ppdev_class, MKDEV(PP_MAJOR, port->number));
800}
801
802static struct parport_driver pp_driver = {
803 .name = CHRDEV,
804 .attach = pp_attach,
805 .detach = pp_detach,
806};
807
808static int __init ppdev_init(void)
809{
810 int err = 0;
811
812 if (register_chrdev(PP_MAJOR, CHRDEV, &pp_fops)) {
813 printk(KERN_WARNING CHRDEV ": unable to get major %d\n",
814 PP_MAJOR);
815 return -EIO;
816 }
817 ppdev_class = class_create(THIS_MODULE, CHRDEV);
818 if (IS_ERR(ppdev_class)) {
819 err = PTR_ERR(ppdev_class);
820 goto out_chrdev;
821 }
822 err = parport_register_driver(&pp_driver);
823 if (err < 0) {
824 printk(KERN_WARNING CHRDEV ": unable to register with parport\n");
825 goto out_class;
826 }
827
828 printk(KERN_INFO PP_VERSION "\n");
829 goto out;
830
831out_class:
832 class_destroy(ppdev_class);
833out_chrdev:
834 unregister_chrdev(PP_MAJOR, CHRDEV);
835out:
836 return err;
837}
838
839static void __exit ppdev_cleanup(void)
840{
841 /* Clean up all parport stuff */
842 parport_unregister_driver(&pp_driver);
843 class_destroy(ppdev_class);
844 unregister_chrdev(PP_MAJOR, CHRDEV);
845}
846
847module_init(ppdev_init);
848module_exit(ppdev_cleanup);
849
850MODULE_LICENSE("GPL");
851MODULE_ALIAS_CHARDEV_MAJOR(PP_MAJOR);