projects / linux-2.6-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
Merge git://git.kernel.org/pub/scm/linux/kernel/git/sam/kbuild-fixes
[linux-2.6-block.git] / drivers / char / ppdev.c
CommitLineData
1da177e4
LT		 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>
1da177e4
LT		 63#include <linux/ioctl.h>
64#include <linux/parport.h>
65#include <linux/ctype.h>
66#include <linux/poll.h>
e6a67846 67#include <linux/major.h>
1da177e4 68#include <linux/ppdev.h>
f2b9857e 69#include <linux/smp_lock.h>
6d535d3e 70#include <linux/uaccess.h>
1da177e4
LT		 71
72#define PP_VERSION "ppdev: user-space parallel port driver"
73#define CHRDEV "ppdev"
74
75struct 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
99static 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
105static ssize_t pp_read (struct file * file, char __user * buf, size_t count,
106 loff_t * ppos)
107{
a7113a96 108 unsigned int minor = iminor(file->f_path.dentry->d_inode);
1da177e4
LT		 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
188static ssize_t pp_write (struct file * file, const char __user * buf,
189 size_t count, loff_t * ppos)
190{
a7113a96 191 unsigned int minor = iminor(file->f_path.dentry->d_inode);
1da177e4
LT		 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
5712cb3d 271static void pp_irq (void *private)
1da177e4 272{
5712cb3d 273 struct pp_struct *pp = private;
1da177e4
LT		 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 = 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
320static 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
6d535d3e 331static int pp_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1da177e4 332{
6d535d3e 333 unsigned int minor = iminor(file->f_path.dentry->d_inode);
1da177e4
LT		 334 struct pp_struct *pp = file->private_data;
335 struct parport * port;
336 void __user *argp = (void __user *)arg;
337
338 /* First handle the cases that don't take arguments. */
339 switch (cmd) {
340 case PPCLAIM:
341 {
342 struct ieee1284_info *info;
343 int ret;
344
345 if (pp->flags & PP_CLAIMED) {
346 printk (KERN_DEBUG CHRDEV
347 "%x: you've already got it!\n", minor);
348 return -EINVAL;
349 }
350
351 /* Deferred device registration. */
352 if (!pp->pdev) {
353 int err = register_device (minor, pp);
354 if (err) {
355 return err;
356 }
357 }
358
359 ret = parport_claim_or_block (pp->pdev);
360 if (ret < 0)
361 return ret;
362
363 pp->flags |= PP_CLAIMED;
364
365 /* For interrupt-reporting to work, we need to be
366 * informed of each interrupt. */
367 pp_enable_irq (pp);
368
369 /* We may need to fix up the state machine. */
370 info = &pp->pdev->port->ieee1284;
371 pp->saved_state.mode = info->mode;
372 pp->saved_state.phase = info->phase;
373 info->mode = pp->state.mode;
374 info->phase = pp->state.phase;
375 pp->default_inactivity = parport_set_timeout (pp->pdev, 0);
376 parport_set_timeout (pp->pdev, pp->default_inactivity);
377
378 return 0;
379 }
380 case PPEXCL:
381 if (pp->pdev) {
382 printk (KERN_DEBUG CHRDEV "%x: too late for PPEXCL; "
383 "already registered\n", minor);
384 if (pp->flags & PP_EXCL)
385 /* But it's not really an error. */
386 return 0;
387 /* There's no chance of making the driver happy. */
388 return -EINVAL;
389 }
390
391 /* Just remember to register the device exclusively
392 * when we finally do the registration. */
393 pp->flags |= PP_EXCL;
394 return 0;
395 case PPSETMODE:
396 {
397 int mode;
398 if (copy_from_user (&mode, argp, sizeof (mode)))
399 return -EFAULT;
400 /* FIXME: validate mode */
401 pp->state.mode = mode;
402 pp->state.phase = init_phase (mode);
403
404 if (pp->flags & PP_CLAIMED) {
405 pp->pdev->port->ieee1284.mode = mode;
406 pp->pdev->port->ieee1284.phase = pp->state.phase;
407 }
408
409 return 0;
410 }
411 case PPGETMODE:
412 {
413 int mode;
414
415 if (pp->flags & PP_CLAIMED) {
416 mode = pp->pdev->port->ieee1284.mode;
417 } else {
418 mode = pp->state.mode;
419 }
420 if (copy_to_user (argp, &mode, sizeof (mode))) {
421 return -EFAULT;
422 }
423 return 0;
424 }
425 case PPSETPHASE:
426 {
427 int phase;
428 if (copy_from_user (&phase, argp, sizeof (phase))) {
429 return -EFAULT;
430 }
431 /* FIXME: validate phase */
432 pp->state.phase = phase;
433
434 if (pp->flags & PP_CLAIMED) {
435 pp->pdev->port->ieee1284.phase = phase;
436 }
437
438 return 0;
439 }
440 case PPGETPHASE:
441 {
442 int phase;
443
444 if (pp->flags & PP_CLAIMED) {
445 phase = pp->pdev->port->ieee1284.phase;
446 } else {
447 phase = pp->state.phase;
448 }
449 if (copy_to_user (argp, &phase, sizeof (phase))) {
450 return -EFAULT;
451 }
452 return 0;
453 }
454 case PPGETMODES:
455 {
456 unsigned int modes;
457
458 port = parport_find_number (minor);
459 if (!port)
460 return -ENODEV;
461
462 modes = port->modes;
463 if (copy_to_user (argp, &modes, sizeof (modes))) {
464 return -EFAULT;
465 }
466 return 0;
467 }
468 case PPSETFLAGS:
469 {
470 int uflags;
471
472 if (copy_from_user (&uflags, argp, sizeof (uflags))) {
473 return -EFAULT;
474 }
475 pp->flags &= ~PP_FLAGMASK;
476 pp->flags |= (uflags & PP_FLAGMASK);
477 return 0;
478 }
479 case PPGETFLAGS:
480 {
481 int uflags;
482
483 uflags = pp->flags & PP_FLAGMASK;
484 if (copy_to_user (argp, &uflags, sizeof (uflags))) {
485 return -EFAULT;
486 }
487 return 0;
488 }
489 } /* end switch() */
490
491 /* Everything else requires the port to be claimed, so check
492 * that now. */
493 if ((pp->flags & PP_CLAIMED) == 0) {
494 printk (KERN_DEBUG CHRDEV "%x: claim the port first\n",
495 minor);
496 return -EINVAL;
497 }
498
499 port = pp->pdev->port;
500 switch (cmd) {
501 struct ieee1284_info *info;
502 unsigned char reg;
503 unsigned char mask;
504 int mode;
505 int ret;
506 struct timeval par_timeout;
507 long to_jiffies;
508
509 case PPRSTATUS:
510 reg = parport_read_status (port);
511 if (copy_to_user (argp, &reg, sizeof (reg)))
512 return -EFAULT;
513 return 0;
514 case PPRDATA:
515 reg = parport_read_data (port);
516 if (copy_to_user (argp, &reg, sizeof (reg)))
517 return -EFAULT;
518 return 0;
519 case PPRCONTROL:
520 reg = parport_read_control (port);
521 if (copy_to_user (argp, &reg, sizeof (reg)))
522 return -EFAULT;
523 return 0;
524 case PPYIELD:
525 parport_yield_blocking (pp->pdev);
526 return 0;
527
528 case PPRELEASE:
529 /* Save the state machine's state. */
530 info = &pp->pdev->port->ieee1284;
531 pp->state.mode = info->mode;
532 pp->state.phase = info->phase;
533 info->mode = pp->saved_state.mode;
534 info->phase = pp->saved_state.phase;
535 parport_release (pp->pdev);
536 pp->flags &= ~PP_CLAIMED;
537 return 0;
538
539 case PPWCONTROL:
540 if (copy_from_user (&reg, argp, sizeof (reg)))
541 return -EFAULT;
542 parport_write_control (port, reg);
543 return 0;
544
545 case PPWDATA:
546 if (copy_from_user (&reg, argp, sizeof (reg)))
547 return -EFAULT;
548 parport_write_data (port, reg);
549 return 0;
550
551 case PPFCONTROL:
552 if (copy_from_user (&mask, argp,
553 sizeof (mask)))
554 return -EFAULT;
555 if (copy_from_user (&reg, 1 + (unsigned char __user *) arg,
556 sizeof (reg)))
557 return -EFAULT;
558 parport_frob_control (port, mask, reg);
559 return 0;
560
561 case PPDATADIR:
562 if (copy_from_user (&mode, argp, sizeof (mode)))
563 return -EFAULT;
564 if (mode)
565 port->ops->data_reverse (port);
566 else
567 port->ops->data_forward (port);
568 return 0;
569
570 case PPNEGOT:
571 if (copy_from_user (&mode, argp, sizeof (mode)))
572 return -EFAULT;
573 switch ((ret = parport_negotiate (port, mode))) {
574 case 0: break;
575 case -1: /* handshake failed, peripheral not IEEE 1284 */
576 ret = -EIO;
577 break;
578 case 1: /* handshake succeeded, peripheral rejected mode */
579 ret = -ENXIO;
580 break;
581 }
582 pp_enable_irq (pp);
583 return ret;
584
585 case PPWCTLONIRQ:
586 if (copy_from_user (&reg, argp, sizeof (reg)))
587 return -EFAULT;
588
589 /* Remember what to set the control lines to, for next
590 * time we get an interrupt. */
591 pp->irqctl = reg;
592 pp->irqresponse = 1;
593 return 0;
594
595 case PPCLRIRQ:
596 ret = atomic_read (&pp->irqc);
597 if (copy_to_user (argp, &ret, sizeof (ret)))
598 return -EFAULT;
599 atomic_sub (ret, &pp->irqc);
600 return 0;
601
602 case PPSETTIME:
603 if (copy_from_user (&par_timeout, argp, sizeof(struct timeval))) {
604 return -EFAULT;
605 }
606 /* Convert to jiffies, place in pp->pdev->timeout */
607 if ((par_timeout.tv_sec < 0) || (par_timeout.tv_usec < 0)) {
608 return -EINVAL;
609 }
610 to_jiffies = ROUND_UP(par_timeout.tv_usec, 1000000/HZ);
611 to_jiffies += par_timeout.tv_sec * (long)HZ;
612 if (to_jiffies <= 0) {
613 return -EINVAL;
614 }
615 pp->pdev->timeout = to_jiffies;
616 return 0;
617
618 case PPGETTIME:
619 to_jiffies = pp->pdev->timeout;
620 par_timeout.tv_sec = to_jiffies / HZ;
621 par_timeout.tv_usec = (to_jiffies % (long)HZ) * (1000000/HZ);
622 if (copy_to_user (argp, &par_timeout, sizeof(struct timeval)))
623 return -EFAULT;
624 return 0;
625
626 default:
627 printk (KERN_DEBUG CHRDEV "%x: What? (cmd=0x%x)\n", minor,
628 cmd);
629 return -EINVAL;
630 }
631
632 /* Keep the compiler happy */
633 return 0;
634}
635
6d535d3e
AC		 636static long pp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
637{
638 long ret;
639 lock_kernel();
640 ret = pp_do_ioctl(file, cmd, arg);
641 unlock_kernel();
642 return ret;
643}
644
1da177e4
LT		 645static int pp_open (struct inode * inode, struct file * file)
646{
647 unsigned int minor = iminor(inode);
648 struct pp_struct *pp;
649
f2b9857e 650 cycle_kernel_lock();
1da177e4
LT		 651 if (minor >= PARPORT_MAX)
652 return -ENXIO;
653
654 pp = kmalloc (sizeof (struct pp_struct), GFP_KERNEL);
655 if (!pp)
656 return -ENOMEM;
657
658 pp->state.mode = IEEE1284_MODE_COMPAT;
659 pp->state.phase = init_phase (pp->state.mode);
660 pp->flags = 0;
661 pp->irqresponse = 0;
662 atomic_set (&pp->irqc, 0);
663 init_waitqueue_head (&pp->irq_wait);
664
665 /* Defer the actual device registration until the first claim.
666 * That way, we know whether or not the driver wants to have
667 * exclusive access to the port (PPEXCL).
668 */
669 pp->pdev = NULL;
670 file->private_data = pp;
671
672 return 0;
673}
674
675static int pp_release (struct inode * inode, struct file * file)
676{
677 unsigned int minor = iminor(inode);
678 struct pp_struct *pp = file->private_data;
679 int compat_negot;
680
681 compat_negot = 0;
682 if (!(pp->flags & PP_CLAIMED) && pp->pdev &&
683 (pp->state.mode != IEEE1284_MODE_COMPAT)) {
684 struct ieee1284_info *info;
685
686 /* parport released, but not in compatibility mode */
687 parport_claim_or_block (pp->pdev);
688 pp->flags |= PP_CLAIMED;
689 info = &pp->pdev->port->ieee1284;
690 pp->saved_state.mode = info->mode;
691 pp->saved_state.phase = info->phase;
692 info->mode = pp->state.mode;
693 info->phase = pp->state.phase;
694 compat_negot = 1;
695 } else if ((pp->flags & PP_CLAIMED) && pp->pdev &&
696 (pp->pdev->port->ieee1284.mode != IEEE1284_MODE_COMPAT)) {
697 compat_negot = 2;
698 }
699 if (compat_negot) {
700 parport_negotiate (pp->pdev->port, IEEE1284_MODE_COMPAT);
701 printk (KERN_DEBUG CHRDEV
702 "%x: negotiated back to compatibility mode because "
703 "user-space forgot\n", minor);
704 }
705
706 if (pp->flags & PP_CLAIMED) {
707 struct ieee1284_info *info;
708
709 info = &pp->pdev->port->ieee1284;
710 pp->state.mode = info->mode;
711 pp->state.phase = info->phase;
712 info->mode = pp->saved_state.mode;
713 info->phase = pp->saved_state.phase;
714 parport_release (pp->pdev);
715 if (compat_negot != 1) {
716 printk (KERN_DEBUG CHRDEV "%x: released pardevice "
717 "because user-space forgot\n", minor);
718 }
719 }
720
721 if (pp->pdev) {
722 const char *name = pp->pdev->name;
723 parport_unregister_device (pp->pdev);
724 kfree (name);
725 pp->pdev = NULL;
726 printk (KERN_DEBUG CHRDEV "%x: unregistered pardevice\n",
727 minor);
728 }
729
730 kfree (pp);
731
732 return 0;
733}
734
735/* No kernel lock held - fine */
736static unsigned int pp_poll (struct file * file, poll_table * wait)
737{
738 struct pp_struct *pp = file->private_data;
739 unsigned int mask = 0;
740
741 poll_wait (file, &pp->irq_wait, wait);
742 if (atomic_read (&pp->irqc))
743 mask |= POLLIN | POLLRDNORM;
744
745 return mask;
746}
747
ca8eca68 748static struct class *ppdev_class;
1da177e4 749
62322d25 750static const struct file_operations pp_fops = {
1da177e4
LT		 751 .owner = THIS_MODULE,
752 .llseek = no_llseek,
753 .read = pp_read,
754 .write = pp_write,
755 .poll = pp_poll,
6d535d3e 756 .unlocked_ioctl = pp_ioctl,
1da177e4
LT		 757 .open = pp_open,
758 .release = pp_release,
759};
760
761static void pp_attach(struct parport *port)
762{
03457cd4
GKH		 763 device_create(ppdev_class, port->dev, MKDEV(PP_MAJOR, port->number),
764 NULL, "parport%d", port->number);
1da177e4
LT		 765}
766
767static void pp_detach(struct parport *port)
768{
04880eda 769 device_destroy(ppdev_class, MKDEV(PP_MAJOR, port->number));
1da177e4
LT		 770}
771
772static struct parport_driver pp_driver = {
773 .name = CHRDEV,
774 .attach = pp_attach,
775 .detach = pp_detach,
776};
777
778static int __init ppdev_init (void)
779{
8ab5e4c1 780 int err = 0;
1da177e4
LT		 781
782 if (register_chrdev (PP_MAJOR, CHRDEV, &pp_fops)) {
783 printk (KERN_WARNING CHRDEV ": unable to get major %d\n",
784 PP_MAJOR);
785 return -EIO;
786 }
ca8eca68 787 ppdev_class = class_create(THIS_MODULE, CHRDEV);
1da177e4
LT		 788 if (IS_ERR(ppdev_class)) {
789 err = PTR_ERR(ppdev_class);
790 goto out_chrdev;
791 }
1da177e4
LT		 792 if (parport_register_driver(&pp_driver)) {
793 printk (KERN_WARNING CHRDEV ": unable to register with parport\n");
794 goto out_class;
795 }
796
797 printk (KERN_INFO PP_VERSION "\n");
798 goto out;
799
800out_class:
ca8eca68 801 class_destroy(ppdev_class);
1da177e4
LT		 802out_chrdev:
803 unregister_chrdev(PP_MAJOR, CHRDEV);
804out:
805 return err;
806}
807
808static void __exit ppdev_cleanup (void)
809{
1da177e4 810 /* Clean up all parport stuff */
1da177e4 811 parport_unregister_driver(&pp_driver);
ca8eca68 812 class_destroy(ppdev_class);
1da177e4
LT		 813 unregister_chrdev (PP_MAJOR, CHRDEV);
814}
815
816module_init(ppdev_init);
817module_exit(ppdev_cleanup);
818
819MODULE_LICENSE("GPL");
820MODULE_ALIAS_CHARDEV_MAJOR(PP_MAJOR);
Linux 6.x block layer and io_uring tree(s)