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drivers/char/ppdev.c: use kasprintf
[GitHub/mt8127/android_kernel_alcatel_ttab.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>
5a0e3ad6 67#include <linux/slab.h>
e6a67846 68#include <linux/major.h>
1da177e4 69#include <linux/ppdev.h>
f2b9857e 70#include <linux/smp_lock.h>
6d535d3e 71#include <linux/uaccess.h>
1da177e4
LT		 72
73#define PP_VERSION "ppdev: user-space parallel port driver"
74#define CHRDEV "ppdev"
75
76struct 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
100static inline void pp_enable_irq (struct pp_struct *pp)
101{
102 struct parport *port = pp->pdev->port;
103 port->ops->enable_irq (port);
104}
105
106static ssize_t pp_read (struct file * file, char __user * buf, size_t count,
107 loff_t * ppos)
108{
a7113a96 109 unsigned int minor = iminor(file->f_path.dentry->d_inode);
1da177e4
LT		 110 struct pp_struct *pp = file->private_data;
111 char * kbuffer;
112 ssize_t bytes_read = 0;
113 struct parport *pport;
114 int mode;
115
116 if (!(pp->flags & PP_CLAIMED)) {
117 /* Don't have the port claimed */
81fc401e 118 pr_debug(CHRDEV "%x: claim the port first\n", minor);
1da177e4
LT		 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 */
81fc401e 201 pr_debug(CHRDEV "%x: claim the port first\n", minor);
1da177e4
LT		 202 return -EINVAL;
203 }
204
205 kbuffer = kmalloc(min_t(size_t, count, PP_BUFFER_SIZE), GFP_KERNEL);
206 if (!kbuffer) {
207 return -ENOMEM;
208 }
209 pport = pp->pdev->port;
210 mode = pport->ieee1284.mode & ~(IEEE1284_DEVICEID | IEEE1284_ADDR);
211
212 parport_set_timeout (pp->pdev,
213 (file->f_flags & O_NONBLOCK) ?
214 PARPORT_INACTIVITY_O_NONBLOCK :
215 pp->default_inactivity);
216
217 while (bytes_written < count) {
218 ssize_t n = min_t(unsigned long, count - bytes_written, PP_BUFFER_SIZE);
219
220 if (copy_from_user (kbuffer, buf + bytes_written, n)) {
221 bytes_written = -EFAULT;
222 break;
223 }
224
225 if ((pp->flags & PP_FASTWRITE) && (mode == IEEE1284_MODE_EPP)) {
226 /* do a fast EPP write */
227 if (pport->ieee1284.mode & IEEE1284_ADDR) {
228 wrote = pport->ops->epp_write_addr (pport,
229 kbuffer, n, PARPORT_EPP_FAST);
230 } else {
231 wrote = pport->ops->epp_write_data (pport,
232 kbuffer, n, PARPORT_EPP_FAST);
233 }
234 } else {
235 wrote = parport_write (pp->pdev->port, kbuffer, n);
236 }
237
238 if (wrote <= 0) {
239 if (!bytes_written) {
240 bytes_written = wrote;
241 }
242 break;
243 }
244
245 bytes_written += wrote;
246
247 if (file->f_flags & O_NONBLOCK) {
248 if (!bytes_written)
249 bytes_written = -EAGAIN;
250 break;
251 }
252
253 if (signal_pending (current)) {
254 if (!bytes_written) {
255 bytes_written = -EINTR;
256 }
257 break;
258 }
259
260 cond_resched();
261 }
262
263 parport_set_timeout (pp->pdev, pp->default_inactivity);
264
265 kfree (kbuffer);
266 pp_enable_irq (pp);
267 return bytes_written;
268}
269
5712cb3d 270static void pp_irq (void *private)
1da177e4 271{
5712cb3d 272 struct pp_struct *pp = private;
1da177e4
LT		 273
274 if (pp->irqresponse) {
275 parport_write_control (pp->pdev->port, pp->irqctl);
276 pp->irqresponse = 0;
277 }
278
279 atomic_inc (&pp->irqc);
280 wake_up_interruptible (&pp->irq_wait);
281}
282
283static int register_device (int minor, struct pp_struct *pp)
284{
285 struct parport *port;
286 struct pardevice * pdev = NULL;
287 char *name;
288 int fl;
289
87575437 290 name = kasprintf(GFP_KERNEL, CHRDEV "%x", minor);
1da177e4
LT		 291 if (name == NULL)
292 return -ENOMEM;
293
1da177e4
LT		 294 port = parport_find_number (minor);
295 if (!port) {
296 printk (KERN_WARNING "%s: no associated port!\n", name);
297 kfree (name);
298 return -ENXIO;
299 }
300
301 fl = (pp->flags & PP_EXCL) ? PARPORT_FLAG_EXCL : 0;
302 pdev = parport_register_device (port, name, NULL,
303 NULL, pp_irq, fl, pp);
304 parport_put_port (port);
305
306 if (!pdev) {
307 printk (KERN_WARNING "%s: failed to register device!\n", name);
308 kfree (name);
309 return -ENXIO;
310 }
311
312 pp->pdev = pdev;
81fc401e 313 pr_debug("%s: registered pardevice\n", name);
1da177e4
LT		 314 return 0;
315}
316
317static enum ieee1284_phase init_phase (int mode)
318{
319 switch (mode & ~(IEEE1284_DEVICEID
320 | IEEE1284_ADDR)) {
321 case IEEE1284_MODE_NIBBLE:
322 case IEEE1284_MODE_BYTE:
323 return IEEE1284_PH_REV_IDLE;
324 }
325 return IEEE1284_PH_FWD_IDLE;
326}
327
6d535d3e 328static int pp_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1da177e4 329{
6d535d3e 330 unsigned int minor = iminor(file->f_path.dentry->d_inode);
1da177e4
LT		 331 struct pp_struct *pp = file->private_data;
332 struct parport * port;
333 void __user *argp = (void __user *)arg;
334
335 /* First handle the cases that don't take arguments. */
336 switch (cmd) {
337 case PPCLAIM:
338 {
339 struct ieee1284_info *info;
340 int ret;
341
342 if (pp->flags & PP_CLAIMED) {
81fc401e 343 pr_debug(CHRDEV "%x: you've already got it!\n", minor);
1da177e4
LT		 344 return -EINVAL;
345 }
346
347 /* Deferred device registration. */
348 if (!pp->pdev) {
349 int err = register_device (minor, pp);
350 if (err) {
351 return err;
352 }
353 }
354
355 ret = parport_claim_or_block (pp->pdev);
356 if (ret < 0)
357 return ret;
358
359 pp->flags |= PP_CLAIMED;
360
361 /* For interrupt-reporting to work, we need to be
362 * informed of each interrupt. */
363 pp_enable_irq (pp);
364
365 /* We may need to fix up the state machine. */
366 info = &pp->pdev->port->ieee1284;
367 pp->saved_state.mode = info->mode;
368 pp->saved_state.phase = info->phase;
369 info->mode = pp->state.mode;
370 info->phase = pp->state.phase;
371 pp->default_inactivity = parport_set_timeout (pp->pdev, 0);
372 parport_set_timeout (pp->pdev, pp->default_inactivity);
373
374 return 0;
375 }
376 case PPEXCL:
377 if (pp->pdev) {
81fc401e 378 pr_debug(CHRDEV "%x: too late for PPEXCL; "
1da177e4
LT		 379 "already registered\n", minor);
380 if (pp->flags & PP_EXCL)
381 /* But it's not really an error. */
382 return 0;
383 /* There's no chance of making the driver happy. */
384 return -EINVAL;
385 }
386
387 /* Just remember to register the device exclusively
388 * when we finally do the registration. */
389 pp->flags |= PP_EXCL;
390 return 0;
391 case PPSETMODE:
392 {
393 int mode;
394 if (copy_from_user (&mode, argp, sizeof (mode)))
395 return -EFAULT;
396 /* FIXME: validate mode */
397 pp->state.mode = mode;
398 pp->state.phase = init_phase (mode);
399
400 if (pp->flags & PP_CLAIMED) {
401 pp->pdev->port->ieee1284.mode = mode;
402 pp->pdev->port->ieee1284.phase = pp->state.phase;
403 }
404
405 return 0;
406 }
407 case PPGETMODE:
408 {
409 int mode;
410
411 if (pp->flags & PP_CLAIMED) {
412 mode = pp->pdev->port->ieee1284.mode;
413 } else {
414 mode = pp->state.mode;
415 }
416 if (copy_to_user (argp, &mode, sizeof (mode))) {
417 return -EFAULT;
418 }
419 return 0;
420 }
421 case PPSETPHASE:
422 {
423 int phase;
424 if (copy_from_user (&phase, argp, sizeof (phase))) {
425 return -EFAULT;
426 }
427 /* FIXME: validate phase */
428 pp->state.phase = phase;
429
430 if (pp->flags & PP_CLAIMED) {
431 pp->pdev->port->ieee1284.phase = phase;
432 }
433
434 return 0;
435 }
436 case PPGETPHASE:
437 {
438 int phase;
439
440 if (pp->flags & PP_CLAIMED) {
441 phase = pp->pdev->port->ieee1284.phase;
442 } else {
443 phase = pp->state.phase;
444 }
445 if (copy_to_user (argp, &phase, sizeof (phase))) {
446 return -EFAULT;
447 }
448 return 0;
449 }
450 case PPGETMODES:
451 {
452 unsigned int modes;
453
454 port = parport_find_number (minor);
455 if (!port)
456 return -ENODEV;
457
458 modes = port->modes;
459 if (copy_to_user (argp, &modes, sizeof (modes))) {
460 return -EFAULT;
461 }
462 return 0;
463 }
464 case PPSETFLAGS:
465 {
466 int uflags;
467
468 if (copy_from_user (&uflags, argp, sizeof (uflags))) {
469 return -EFAULT;
470 }
471 pp->flags &= ~PP_FLAGMASK;
472 pp->flags |= (uflags & PP_FLAGMASK);
473 return 0;
474 }
475 case PPGETFLAGS:
476 {
477 int uflags;
478
479 uflags = pp->flags & PP_FLAGMASK;
480 if (copy_to_user (argp, &uflags, sizeof (uflags))) {
481 return -EFAULT;
482 }
483 return 0;
484 }
485 } /* end switch() */
486
487 /* Everything else requires the port to be claimed, so check
488 * that now. */
489 if ((pp->flags & PP_CLAIMED) == 0) {
81fc401e 490 pr_debug(CHRDEV "%x: claim the port first\n", minor);
1da177e4
LT		 491 return -EINVAL;
492 }
493
494 port = pp->pdev->port;
495 switch (cmd) {
496 struct ieee1284_info *info;
497 unsigned char reg;
498 unsigned char mask;
499 int mode;
500 int ret;
501 struct timeval par_timeout;
502 long to_jiffies;
503
504 case PPRSTATUS:
505 reg = parport_read_status (port);
506 if (copy_to_user (argp, &reg, sizeof (reg)))
507 return -EFAULT;
508 return 0;
509 case PPRDATA:
510 reg = parport_read_data (port);
511 if (copy_to_user (argp, &reg, sizeof (reg)))
512 return -EFAULT;
513 return 0;
514 case PPRCONTROL:
515 reg = parport_read_control (port);
516 if (copy_to_user (argp, &reg, sizeof (reg)))
517 return -EFAULT;
518 return 0;
519 case PPYIELD:
520 parport_yield_blocking (pp->pdev);
521 return 0;
522
523 case PPRELEASE:
524 /* Save the state machine's state. */
525 info = &pp->pdev->port->ieee1284;
526 pp->state.mode = info->mode;
527 pp->state.phase = info->phase;
528 info->mode = pp->saved_state.mode;
529 info->phase = pp->saved_state.phase;
530 parport_release (pp->pdev);
531 pp->flags &= ~PP_CLAIMED;
532 return 0;
533
534 case PPWCONTROL:
535 if (copy_from_user (&reg, argp, sizeof (reg)))
536 return -EFAULT;
537 parport_write_control (port, reg);
538 return 0;
539
540 case PPWDATA:
541 if (copy_from_user (&reg, argp, sizeof (reg)))
542 return -EFAULT;
543 parport_write_data (port, reg);
544 return 0;
545
546 case PPFCONTROL:
547 if (copy_from_user (&mask, argp,
548 sizeof (mask)))
549 return -EFAULT;
550 if (copy_from_user (&reg, 1 + (unsigned char __user *) arg,
551 sizeof (reg)))
552 return -EFAULT;
553 parport_frob_control (port, mask, reg);
554 return 0;
555
556 case PPDATADIR:
557 if (copy_from_user (&mode, argp, sizeof (mode)))
558 return -EFAULT;
559 if (mode)
560 port->ops->data_reverse (port);
561 else
562 port->ops->data_forward (port);
563 return 0;
564
565 case PPNEGOT:
566 if (copy_from_user (&mode, argp, sizeof (mode)))
567 return -EFAULT;
568 switch ((ret = parport_negotiate (port, mode))) {
569 case 0: break;
570 case -1: /* handshake failed, peripheral not IEEE 1284 */
571 ret = -EIO;
572 break;
573 case 1: /* handshake succeeded, peripheral rejected mode */
574 ret = -ENXIO;
575 break;
576 }
577 pp_enable_irq (pp);
578 return ret;
579
580 case PPWCTLONIRQ:
581 if (copy_from_user (&reg, argp, sizeof (reg)))
582 return -EFAULT;
583
584 /* Remember what to set the control lines to, for next
585 * time we get an interrupt. */
586 pp->irqctl = reg;
587 pp->irqresponse = 1;
588 return 0;
589
590 case PPCLRIRQ:
591 ret = atomic_read (&pp->irqc);
592 if (copy_to_user (argp, &ret, sizeof (ret)))
593 return -EFAULT;
594 atomic_sub (ret, &pp->irqc);
595 return 0;
596
597 case PPSETTIME:
598 if (copy_from_user (&par_timeout, argp, sizeof(struct timeval))) {
599 return -EFAULT;
600 }
601 /* Convert to jiffies, place in pp->pdev->timeout */
602 if ((par_timeout.tv_sec < 0) || (par_timeout.tv_usec < 0)) {
603 return -EINVAL;
604 }
605 to_jiffies = ROUND_UP(par_timeout.tv_usec, 1000000/HZ);
606 to_jiffies += par_timeout.tv_sec * (long)HZ;
607 if (to_jiffies <= 0) {
608 return -EINVAL;
609 }
610 pp->pdev->timeout = to_jiffies;
611 return 0;
612
613 case PPGETTIME:
614 to_jiffies = pp->pdev->timeout;
615 par_timeout.tv_sec = to_jiffies / HZ;
616 par_timeout.tv_usec = (to_jiffies % (long)HZ) * (1000000/HZ);
617 if (copy_to_user (argp, &par_timeout, sizeof(struct timeval)))
618 return -EFAULT;
619 return 0;
620
621 default:
81fc401e 622 pr_debug(CHRDEV "%x: What? (cmd=0x%x)\n", minor, cmd);
1da177e4
LT		 623 return -EINVAL;
624 }
625
626 /* Keep the compiler happy */
627 return 0;
628}
629
6d535d3e
AC		 630static long pp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
631{
632 long ret;
633 lock_kernel();
634 ret = pp_do_ioctl(file, cmd, arg);
635 unlock_kernel();
636 return ret;
637}
638
1da177e4
LT		 639static int pp_open (struct inode * inode, struct file * file)
640{
641 unsigned int minor = iminor(inode);
642 struct pp_struct *pp;
643
f2b9857e 644 cycle_kernel_lock();
1da177e4
LT		 645 if (minor >= PARPORT_MAX)
646 return -ENXIO;
647
648 pp = kmalloc (sizeof (struct pp_struct), GFP_KERNEL);
649 if (!pp)
650 return -ENOMEM;
651
652 pp->state.mode = IEEE1284_MODE_COMPAT;
653 pp->state.phase = init_phase (pp->state.mode);
654 pp->flags = 0;
655 pp->irqresponse = 0;
656 atomic_set (&pp->irqc, 0);
657 init_waitqueue_head (&pp->irq_wait);
658
659 /* Defer the actual device registration until the first claim.
660 * That way, we know whether or not the driver wants to have
661 * exclusive access to the port (PPEXCL).
662 */
663 pp->pdev = NULL;
664 file->private_data = pp;
665
666 return 0;
667}
668
669static int pp_release (struct inode * inode, struct file * file)
670{
671 unsigned int minor = iminor(inode);
672 struct pp_struct *pp = file->private_data;
673 int compat_negot;
674
675 compat_negot = 0;
676 if (!(pp->flags & PP_CLAIMED) && pp->pdev &&
677 (pp->state.mode != IEEE1284_MODE_COMPAT)) {
678 struct ieee1284_info *info;
679
680 /* parport released, but not in compatibility mode */
681 parport_claim_or_block (pp->pdev);
682 pp->flags |= PP_CLAIMED;
683 info = &pp->pdev->port->ieee1284;
684 pp->saved_state.mode = info->mode;
685 pp->saved_state.phase = info->phase;
686 info->mode = pp->state.mode;
687 info->phase = pp->state.phase;
688 compat_negot = 1;
689 } else if ((pp->flags & PP_CLAIMED) && pp->pdev &&
690 (pp->pdev->port->ieee1284.mode != IEEE1284_MODE_COMPAT)) {
691 compat_negot = 2;
692 }
693 if (compat_negot) {
694 parport_negotiate (pp->pdev->port, IEEE1284_MODE_COMPAT);
81fc401e
MB		 695 pr_debug(CHRDEV "%x: negotiated back to compatibility "
696 "mode because user-space forgot\n", minor);
1da177e4
LT		 697 }
698
699 if (pp->flags & PP_CLAIMED) {
700 struct ieee1284_info *info;
701
702 info = &pp->pdev->port->ieee1284;
703 pp->state.mode = info->mode;
704 pp->state.phase = info->phase;
705 info->mode = pp->saved_state.mode;
706 info->phase = pp->saved_state.phase;
707 parport_release (pp->pdev);
708 if (compat_negot != 1) {
81fc401e 709 pr_debug(CHRDEV "%x: released pardevice "
1da177e4
LT		 710 "because user-space forgot\n", minor);
711 }
712 }
713
714 if (pp->pdev) {
715 const char *name = pp->pdev->name;
716 parport_unregister_device (pp->pdev);
717 kfree (name);
718 pp->pdev = NULL;
81fc401e 719 pr_debug(CHRDEV "%x: unregistered pardevice\n", minor);
1da177e4
LT		 720 }
721
722 kfree (pp);
723
724 return 0;
725}
726
727/* No kernel lock held - fine */
728static unsigned int pp_poll (struct file * file, poll_table * wait)
729{
730 struct pp_struct *pp = file->private_data;
731 unsigned int mask = 0;
732
733 poll_wait (file, &pp->irq_wait, wait);
734 if (atomic_read (&pp->irqc))
735 mask |= POLLIN | POLLRDNORM;
736
737 return mask;
738}
739
ca8eca68 740static struct class *ppdev_class;
1da177e4 741
62322d25 742static const struct file_operations pp_fops = {
1da177e4
LT		 743 .owner = THIS_MODULE,
744 .llseek = no_llseek,
745 .read = pp_read,
746 .write = pp_write,
747 .poll = pp_poll,
6d535d3e 748 .unlocked_ioctl = pp_ioctl,
1da177e4
LT		 749 .open = pp_open,
750 .release = pp_release,
751};
752
753static void pp_attach(struct parport *port)
754{
03457cd4
GKH		 755 device_create(ppdev_class, port->dev, MKDEV(PP_MAJOR, port->number),
756 NULL, "parport%d", port->number);
1da177e4
LT		 757}
758
759static void pp_detach(struct parport *port)
760{
04880eda 761 device_destroy(ppdev_class, MKDEV(PP_MAJOR, port->number));
1da177e4
LT		 762}
763
764static struct parport_driver pp_driver = {
765 .name = CHRDEV,
766 .attach = pp_attach,
767 .detach = pp_detach,
768};
769
770static int __init ppdev_init (void)
771{
8ab5e4c1 772 int err = 0;
1da177e4
LT		 773
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 }
ca8eca68 779 ppdev_class = class_create(THIS_MODULE, CHRDEV);
1da177e4
LT		 780 if (IS_ERR(ppdev_class)) {
781 err = PTR_ERR(ppdev_class);
782 goto out_chrdev;
783 }
1da177e4
LT		 784 if (parport_register_driver(&pp_driver)) {
785 printk (KERN_WARNING CHRDEV ": unable to register with parport\n");
786 goto out_class;
787 }
788
789 printk (KERN_INFO PP_VERSION "\n");
790 goto out;
791
792out_class:
ca8eca68 793 class_destroy(ppdev_class);
1da177e4
LT		 794out_chrdev:
795 unregister_chrdev(PP_MAJOR, CHRDEV);
796out:
797 return err;
798}
799
800static void __exit ppdev_cleanup (void)
801{
1da177e4 802 /* Clean up all parport stuff */
1da177e4 803 parport_unregister_driver(&pp_driver);
ca8eca68 804 class_destroy(ppdev_class);
1da177e4
LT		 805 unregister_chrdev (PP_MAJOR, CHRDEV);
806}
807
808module_init(ppdev_init);
809module_exit(ppdev_cleanup);
810
811MODULE_LICENSE("GPL");
812MODULE_ALIAS_CHARDEV_MAJOR(PP_MAJOR);
kernel source for telekom puls (alcatel/mediatek)