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Root/drivers/char/ppdev.c

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/slab.h>
68	#include <linux/major.h>
69	#include <linux/ppdev.h>
70	#include <linux/mutex.h>
71	#include <linux/uaccess.h>
72
73	#define PP_VERSION "ppdev: user-space parallel port driver"
74	#define CHRDEV "ppdev"
75
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	};
87
88	/* pp_struct.flags bitfields */
89	#define PP_CLAIMED (1<<0)
90	#define PP_EXCL (1<<1)
91
92	/* Other constants */
93	#define PP_INTERRUPT_TIMEOUT (10 * HZ) /* 10s */
94	#define PP_BUFFER_SIZE 1024
95	#define PARDEVICE_MAX 8
96
97	/* ROUND_UP macro from fs/select.c */
98	#define ROUND_UP(x,y) (((x)+(y)-1)/(y))
99
100	static DEFINE_MUTEX(pp_do_mutex);
101	static inline void pp_enable_irq (struct pp_struct *pp)
102	{
103	struct parport *port = pp->pdev->port;
104	port->ops->enable_irq (port);
105	}
106
107	static ssize_t pp_read (struct file * file, char __user * buf, size_t count,
108	loff_t * ppos)
109	{
110	unsigned int minor = iminor(file_inode(file));
111	struct pp_struct *pp = file->private_data;
112	char * kbuffer;
113	ssize_t bytes_read = 0;
114	struct parport *pport;
115	int mode;
116
117	if (!(pp->flags & PP_CLAIMED)) {
118	/* Don't have the port claimed */
119	pr_debug(CHRDEV "%x: claim the port first\n", minor);
120	return -EINVAL;
121	}
122
123	/* Trivial case. */
124	if (count == 0)
125	return 0;
126
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);
133
134	parport_set_timeout (pp->pdev,
135	(file->f_flags & O_NONBLOCK) ?
136	PARPORT_INACTIVITY_O_NONBLOCK :
137	pp->default_inactivity);
138
139	while (bytes_read == 0) {
140	ssize_t need = min_t(unsigned long, count, PP_BUFFER_SIZE);
141
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);
146
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	}
162
163	if (bytes_read != 0)
164	break;
165
166	if (file->f_flags & O_NONBLOCK) {
167	bytes_read = -EAGAIN;
168	break;
169	}
170
171	if (signal_pending (current)) {
172	bytes_read = -ERESTARTSYS;
173	break;
174	}
175
176	cond_resched();
177	}
178
179	parport_set_timeout (pp->pdev, pp->default_inactivity);
180
181	if (bytes_read > 0 && copy_to_user (buf, kbuffer, bytes_read))
182	bytes_read = -EFAULT;
183
184	kfree (kbuffer);
185	pp_enable_irq (pp);
186	return bytes_read;
187	}
188
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_inode(file));
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;
199
200	if (!(pp->flags & PP_CLAIMED)) {
201	/* Don't have the port claimed */
202	pr_debug(CHRDEV "%x: claim the port first\n", 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	break;
256
257	cond_resched();
258	}
259
260	parport_set_timeout (pp->pdev, pp->default_inactivity);
261
262	kfree (kbuffer);
263	pp_enable_irq (pp);
264	return bytes_written;
265	}
266
267	static void pp_irq (void *private)
268	{
269	struct pp_struct *pp = private;
270
271	if (pp->irqresponse) {
272	parport_write_control (pp->pdev->port, pp->irqctl);
273	pp->irqresponse = 0;
274	}
275
276	atomic_inc (&pp->irqc);
277	wake_up_interruptible (&pp->irq_wait);
278	}
279
280	static int register_device (int minor, struct pp_struct *pp)
281	{
282	struct parport *port;
283	struct pardevice * pdev = NULL;
284	char *name;
285	int fl;
286
287	name = kasprintf(GFP_KERNEL, CHRDEV "%x", minor);
288	if (name == NULL)
289	return -ENOMEM;
290
291	port = parport_find_number (minor);
292	if (!port) {
293	printk (KERN_WARNING "%s: no associated port!\n", name);
294	kfree (name);
295	return -ENXIO;
296	}
297
298	fl = (pp->flags & PP_EXCL) ? PARPORT_FLAG_EXCL : 0;
299	pdev = parport_register_device (port, name, NULL,
300	NULL, pp_irq, fl, pp);
301	parport_put_port (port);
302
303	if (!pdev) {
304	printk (KERN_WARNING "%s: failed to register device!\n", name);
305	kfree (name);
306	return -ENXIO;
307	}
308
309	pp->pdev = pdev;
310	pr_debug("%s: registered pardevice\n", name);
311	return 0;
312	}
313
314	static enum ieee1284_phase init_phase (int mode)
315	{
316	switch (mode & ~(IEEE1284_DEVICEID
317	\| IEEE1284_ADDR)) {
318	case IEEE1284_MODE_NIBBLE:
319	case IEEE1284_MODE_BYTE:
320	return IEEE1284_PH_REV_IDLE;
321	}
322	return IEEE1284_PH_FWD_IDLE;
323	}
324
325	static int pp_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
326	{
327	unsigned int minor = iminor(file_inode(file));
328	struct pp_struct *pp = file->private_data;
329	struct parport * port;
330	void __user argp = (void __user )arg;
331
332	/* First handle the cases that don't take arguments. */
333	switch (cmd) {
334	case PPCLAIM:
335	{
336	struct ieee1284_info *info;
337	int ret;
338
339	if (pp->flags & PP_CLAIMED) {
340	pr_debug(CHRDEV "%x: you've already got it!\n", minor);
341	return -EINVAL;
342	}
343
344	/* Deferred device registration. */
345	if (!pp->pdev) {
346	int err = register_device (minor, pp);
347	if (err) {
348	return err;
349	}
350	}
351
352	ret = parport_claim_or_block (pp->pdev);
353	if (ret < 0)
354	return ret;
355
356	pp->flags \|= PP_CLAIMED;
357
358	/* For interrupt-reporting to work, we need to be
359	* informed of each interrupt. */
360	pp_enable_irq (pp);
361
362	/* We may need to fix up the state machine. */
363	info = &pp->pdev->port->ieee1284;
364	pp->saved_state.mode = info->mode;
365	pp->saved_state.phase = info->phase;
366	info->mode = pp->state.mode;
367	info->phase = pp->state.phase;
368	pp->default_inactivity = parport_set_timeout (pp->pdev, 0);
369	parport_set_timeout (pp->pdev, pp->default_inactivity);
370
371	return 0;
372	}
373	case PPEXCL:
374	if (pp->pdev) {
375	pr_debug(CHRDEV "%x: too late for PPEXCL; "
376	"already registered\n", minor);
377	if (pp->flags & PP_EXCL)
378	/* But it's not really an error. */
379	return 0;
380	/* There's no chance of making the driver happy. */
381	return -EINVAL;
382	}
383
384	/* Just remember to register the device exclusively
385	* when we finally do the registration. */
386	pp->flags \|= PP_EXCL;
387	return 0;
388	case PPSETMODE:
389	{
390	int mode;
391	if (copy_from_user (&mode, argp, sizeof (mode)))
392	return -EFAULT;
393	/* FIXME: validate mode */
394	pp->state.mode = mode;
395	pp->state.phase = init_phase (mode);
396
397	if (pp->flags & PP_CLAIMED) {
398	pp->pdev->port->ieee1284.mode = mode;
399	pp->pdev->port->ieee1284.phase = pp->state.phase;
400	}
401
402	return 0;
403	}
404	case PPGETMODE:
405	{
406	int mode;
407
408	if (pp->flags & PP_CLAIMED) {
409	mode = pp->pdev->port->ieee1284.mode;
410	} else {
411	mode = pp->state.mode;
412	}
413	if (copy_to_user (argp, &mode, sizeof (mode))) {
414	return -EFAULT;
415	}
416	return 0;
417	}
418	case PPSETPHASE:
419	{
420	int phase;
421	if (copy_from_user (&phase, argp, sizeof (phase))) {
422	return -EFAULT;
423	}
424	/* FIXME: validate phase */
425	pp->state.phase = phase;
426
427	if (pp->flags & PP_CLAIMED) {
428	pp->pdev->port->ieee1284.phase = phase;
429	}
430
431	return 0;
432	}
433	case PPGETPHASE:
434	{
435	int phase;
436
437	if (pp->flags & PP_CLAIMED) {
438	phase = pp->pdev->port->ieee1284.phase;
439	} else {
440	phase = pp->state.phase;
441	}
442	if (copy_to_user (argp, &phase, sizeof (phase))) {
443	return -EFAULT;
444	}
445	return 0;
446	}
447	case PPGETMODES:
448	{
449	unsigned int modes;
450
451	port = parport_find_number (minor);
452	if (!port)
453	return -ENODEV;
454
455	modes = port->modes;
456	parport_put_port(port);
457	if (copy_to_user (argp, &modes, sizeof (modes))) {
458	return -EFAULT;
459	}
460	return 0;
461	}
462	case PPSETFLAGS:
463	{
464	int uflags;
465
466	if (copy_from_user (&uflags, argp, sizeof (uflags))) {
467	return -EFAULT;
468	}
469	pp->flags &= ~PP_FLAGMASK;
470	pp->flags \|= (uflags & PP_FLAGMASK);
471	return 0;
472	}
473	case PPGETFLAGS:
474	{
475	int uflags;
476
477	uflags = pp->flags & PP_FLAGMASK;
478	if (copy_to_user (argp, &uflags, sizeof (uflags))) {
479	return -EFAULT;
480	}
481	return 0;
482	}
483	} /* end switch() */
484
485	/* Everything else requires the port to be claimed, so check
486	* that now. */
487	if ((pp->flags & PP_CLAIMED) == 0) {
488	pr_debug(CHRDEV "%x: claim the port first\n", minor);
489	return -EINVAL;
490	}
491
492	port = pp->pdev->port;
493	switch (cmd) {
494	struct ieee1284_info *info;
495	unsigned char reg;
496	unsigned char mask;
497	int mode;
498	int ret;
499	struct timeval par_timeout;
500	long to_jiffies;
501
502	case PPRSTATUS:
503	reg = parport_read_status (port);
504	if (copy_to_user (argp, &reg, sizeof (reg)))
505	return -EFAULT;
506	return 0;
507	case PPRDATA:
508	reg = parport_read_data (port);
509	if (copy_to_user (argp, &reg, sizeof (reg)))
510	return -EFAULT;
511	return 0;
512	case PPRCONTROL:
513	reg = parport_read_control (port);
514	if (copy_to_user (argp, &reg, sizeof (reg)))
515	return -EFAULT;
516	return 0;
517	case PPYIELD:
518	parport_yield_blocking (pp->pdev);
519	return 0;
520
521	case PPRELEASE:
522	/* Save the state machine's state. */
523	info = &pp->pdev->port->ieee1284;
524	pp->state.mode = info->mode;
525	pp->state.phase = info->phase;
526	info->mode = pp->saved_state.mode;
527	info->phase = pp->saved_state.phase;
528	parport_release (pp->pdev);
529	pp->flags &= ~PP_CLAIMED;
530	return 0;
531
532	case PPWCONTROL:
533	if (copy_from_user (&reg, argp, sizeof (reg)))
534	return -EFAULT;
535	parport_write_control (port, reg);
536	return 0;
537
538	case PPWDATA:
539	if (copy_from_user (&reg, argp, sizeof (reg)))
540	return -EFAULT;
541	parport_write_data (port, reg);
542	return 0;
543
544	case PPFCONTROL:
545	if (copy_from_user (&mask, argp,
546	sizeof (mask)))
547	return -EFAULT;
548	if (copy_from_user (&reg, 1 + (unsigned char __user *) arg,
549	sizeof (reg)))
550	return -EFAULT;
551	parport_frob_control (port, mask, reg);
552	return 0;
553
554	case PPDATADIR:
555	if (copy_from_user (&mode, argp, sizeof (mode)))
556	return -EFAULT;
557	if (mode)
558	port->ops->data_reverse (port);
559	else
560	port->ops->data_forward (port);
561	return 0;
562
563	case PPNEGOT:
564	if (copy_from_user (&mode, argp, sizeof (mode)))
565	return -EFAULT;
566	switch ((ret = parport_negotiate (port, mode))) {
567	case 0: break;
568	case -1: /* handshake failed, peripheral not IEEE 1284 */
569	ret = -EIO;
570	break;
571	case 1: /* handshake succeeded, peripheral rejected mode */
572	ret = -ENXIO;
573	break;
574	}
575	pp_enable_irq (pp);
576	return ret;
577
578	case PPWCTLONIRQ:
579	if (copy_from_user (&reg, argp, sizeof (reg)))
580	return -EFAULT;
581
582	/* Remember what to set the control lines to, for next
583	* time we get an interrupt. */
584	pp->irqctl = reg;
585	pp->irqresponse = 1;
586	return 0;
587
588	case PPCLRIRQ:
589	ret = atomic_read (&pp->irqc);
590	if (copy_to_user (argp, &ret, sizeof (ret)))
591	return -EFAULT;
592	atomic_sub (ret, &pp->irqc);
593	return 0;
594
595	case PPSETTIME:
596	if (copy_from_user (&par_timeout, argp, sizeof(struct timeval))) {
597	return -EFAULT;
598	}
599	/* Convert to jiffies, place in pp->pdev->timeout */
600	if ((par_timeout.tv_sec < 0) \|\| (par_timeout.tv_usec < 0)) {
601	return -EINVAL;
602	}
603	to_jiffies = ROUND_UP(par_timeout.tv_usec, 1000000/HZ);
604	to_jiffies += par_timeout.tv_sec * (long)HZ;
605	if (to_jiffies <= 0) {
606	return -EINVAL;
607	}
608	pp->pdev->timeout = to_jiffies;
609	return 0;
610
611	case PPGETTIME:
612	to_jiffies = pp->pdev->timeout;
613	memset(&par_timeout, 0, sizeof(par_timeout));
614	par_timeout.tv_sec = to_jiffies / HZ;
615	par_timeout.tv_usec = (to_jiffies % (long)HZ) * (1000000/HZ);
616	if (copy_to_user (argp, &par_timeout, sizeof(struct timeval)))
617	return -EFAULT;
618	return 0;
619
620	default:
621	pr_debug(CHRDEV "%x: What? (cmd=0x%x)\n", minor, cmd);
622	return -EINVAL;
623	}
624
625	/* Keep the compiler happy */
626	return 0;
627	}
628
629	static long pp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
630	{
631	long ret;
632	mutex_lock(&pp_do_mutex);
633	ret = pp_do_ioctl(file, cmd, arg);
634	mutex_unlock(&pp_do_mutex);
635	return ret;
636	}
637
638	static int pp_open (struct inode * inode, struct file * file)
639	{
640	unsigned int minor = iminor(inode);
641	struct pp_struct *pp;
642
643	if (minor >= PARPORT_MAX)
644	return -ENXIO;
645
646	pp = kmalloc (sizeof (struct pp_struct), GFP_KERNEL);
647	if (!pp)
648	return -ENOMEM;
649
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);
656
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;
663
664	return 0;
665	}
666
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;
672
673	compat_negot = 0;
674	if (!(pp->flags & PP_CLAIMED) && pp->pdev &&
675	(pp->state.mode != IEEE1284_MODE_COMPAT)) {
676	struct ieee1284_info *info;
677
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	pr_debug(CHRDEV "%x: negotiated back to compatibility "
694	"mode because 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	pr_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	pr_debug(CHRDEV "%x: unregistered pardevice\n", minor);
718	}
719
720	kfree (pp);
721
722	return 0;
723	}
724
725	/* No kernel lock held - fine */
726	static unsigned int pp_poll (struct file * file, poll_table * wait)
727	{
728	struct pp_struct *pp = file->private_data;
729	unsigned int mask = 0;
730
731	poll_wait (file, &pp->irq_wait, wait);
732	if (atomic_read (&pp->irqc))
733	mask \|= POLLIN \| POLLRDNORM;
734
735	return mask;
736	}
737
738	static struct class *ppdev_class;
739
740	static const struct file_operations pp_fops = {
741	.owner = THIS_MODULE,
742	.llseek = no_llseek,
743	.read = pp_read,
744	.write = pp_write,
745	.poll = pp_poll,
746	.unlocked_ioctl = pp_ioctl,
747	.open = pp_open,
748	.release = pp_release,
749	};
750
751	static void pp_attach(struct parport *port)
752	{
753	device_create(ppdev_class, port->dev, MKDEV(PP_MAJOR, port->number),
754	NULL, "parport%d", port->number);
755	}
756
757	static void pp_detach(struct parport *port)
758	{
759	device_destroy(ppdev_class, MKDEV(PP_MAJOR, port->number));
760	}
761
762	static struct parport_driver pp_driver = {
763	.name = CHRDEV,
764	.attach = pp_attach,
765	.detach = pp_detach,
766	};
767
768	static int __init ppdev_init (void)
769	{
770	int err = 0;
771
772	if (register_chrdev (PP_MAJOR, CHRDEV, &pp_fops)) {
773	printk (KERN_WARNING CHRDEV ": unable to get major %d\n",
774	PP_MAJOR);
775	return -EIO;
776	}
777	ppdev_class = class_create(THIS_MODULE, CHRDEV);
778	if (IS_ERR(ppdev_class)) {
779	err = PTR_ERR(ppdev_class);
780	goto out_chrdev;
781	}
782	err = parport_register_driver(&pp_driver);
783	if (err < 0) {
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);
812

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