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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Generic parallel printer driver
4 *
5 * Copyright (C) 1992 by Jim Weigand and Linus Torvalds
6 * Copyright (C) 1992,1993 by Michael K. Johnson
7 * - Thanks much to Gunter Windau for pointing out to me where the error
8 * checking ought to be.
9 * Copyright (C) 1993 by Nigel Gamble (added interrupt code)
10 * Copyright (C) 1994 by Alan Cox (Modularised it)
11 * LPCAREFUL, LPABORT, LPGETSTATUS added by Chris Metcalf, metcalf@lcs.mit.edu
12 * Statistics and support for slow printers by Rob Janssen, rob@knoware.nl
13 * "lp=" command line parameters added by Grant Guenther, grant@torque.net
14 * lp_read (Status readback) support added by Carsten Gross,
15 * carsten@sol.wohnheim.uni-ulm.de
16 * Support for parport by Philip Blundell <philb@gnu.org>
17 * Parport sharing hacking by Andrea Arcangeli
18 * Fixed kernel_(to/from)_user memory copy to check for errors
19 * by Riccardo Facchetti <fizban@tin.it>
20 * 22-JAN-1998 Added support for devfs Richard Gooch <rgooch@atnf.csiro.au>
21 * Redesigned interrupt handling for handle printers with buggy handshake
22 * by Andrea Arcangeli, 11 May 1998
23 * Full efficient handling of printer with buggy irq handshake (now I have
24 * understood the meaning of the strange handshake). This is done sending new
25 * characters if the interrupt is just happened, even if the printer say to
26 * be still BUSY. This is needed at least with Epson Stylus Color. To enable
27 * the new TRUST_IRQ mode read the `LP OPTIMIZATION' section below...
28 * Fixed the irq on the rising edge of the strobe case.
29 * Obsoleted the CAREFUL flag since a printer that doesn' t work with
30 * CAREFUL will block a bit after in lp_check_status().
31 * Andrea Arcangeli, 15 Oct 1998
32 * Obsoleted and removed all the lowlevel stuff implemented in the last
33 * month to use the IEEE1284 functions (that handle the _new_ compatibilty
34 * mode fine).
35 */
36
37/* This driver should, in theory, work with any parallel port that has an
38 * appropriate low-level driver; all I/O is done through the parport
39 * abstraction layer.
40 *
41 * If this driver is built into the kernel, you can configure it using the
42 * kernel command-line. For example:
43 *
44 * lp=parport1,none,parport2 (bind lp0 to parport1, disable lp1 and
45 * bind lp2 to parport2)
46 *
47 * lp=auto (assign lp devices to all ports that
48 * have printers attached, as determined
49 * by the IEEE-1284 autoprobe)
50 *
51 * lp=reset (reset the printer during
52 * initialisation)
53 *
54 * lp=off (disable the printer driver entirely)
55 *
56 * If the driver is loaded as a module, similar functionality is available
57 * using module parameters. The equivalent of the above commands would be:
58 *
59 * # insmod lp.o parport=1,none,2
60 *
61 * # insmod lp.o parport=auto
62 *
63 * # insmod lp.o reset=1
64 */
65
66/* COMPATIBILITY WITH OLD KERNELS
67 *
68 * Under Linux 2.0 and previous versions, lp devices were bound to ports at
69 * particular I/O addresses, as follows:
70 *
71 * lp0 0x3bc
72 * lp1 0x378
73 * lp2 0x278
74 *
75 * The new driver, by default, binds lp devices to parport devices as it
76 * finds them. This means that if you only have one port, it will be bound
77 * to lp0 regardless of its I/O address. If you need the old behaviour, you
78 * can force it using the parameters described above.
79 */
80
81/*
82 * The new interrupt handling code take care of the buggy handshake
83 * of some HP and Epson printer:
84 * ___
85 * ACK _______________ ___________
86 * |__|
87 * ____
88 * BUSY _________ _______
89 * |____________|
90 *
91 * I discovered this using the printer scanner that you can find at:
92 *
93 * ftp://e-mind.com/pub/linux/pscan/
94 *
95 * 11 May 98, Andrea Arcangeli
96 *
97 * My printer scanner run on an Epson Stylus Color show that such printer
98 * generates the irq on the _rising_ edge of the STROBE. Now lp handle
99 * this case fine too.
100 *
101 * 15 Oct 1998, Andrea Arcangeli
102 *
103 * The so called `buggy' handshake is really the well documented
104 * compatibility mode IEEE1284 handshake. They changed the well known
105 * Centronics handshake acking in the middle of busy expecting to not
106 * break drivers or legacy application, while they broken linux lp
107 * until I fixed it reverse engineering the protocol by hand some
108 * month ago...
109 *
110 * 14 Dec 1998, Andrea Arcangeli
111 *
112 * Copyright (C) 2000 by Tim Waugh (added LPSETTIMEOUT ioctl)
113 */
114
115#include <linux/module.h>
116#include <linux/init.h>
117
118#include <linux/errno.h>
119#include <linux/kernel.h>
120#include <linux/major.h>
121#include <linux/sched/signal.h>
122#include <linux/slab.h>
123#include <linux/fcntl.h>
124#include <linux/delay.h>
125#include <linux/poll.h>
126#include <linux/console.h>
127#include <linux/device.h>
128#include <linux/wait.h>
129#include <linux/jiffies.h>
130#include <linux/mutex.h>
131#include <linux/compat.h>
132
133#include <linux/parport.h>
134#undef LP_STATS
135#include <linux/lp.h>
136
137#include <asm/irq.h>
138#include <linux/uaccess.h>
139
140/* if you have more than 8 printers, remember to increase LP_NO */
141#define LP_NO 8
142
143static DEFINE_MUTEX(lp_mutex);
144static struct lp_struct lp_table[LP_NO];
145static int port_num[LP_NO];
146
147static unsigned int lp_count = 0;
148static struct class *lp_class;
149
150#ifdef CONFIG_LP_CONSOLE
151static struct parport *console_registered;
152#endif /* CONFIG_LP_CONSOLE */
153
154#undef LP_DEBUG
155
156/* Bits used to manage claiming the parport device */
157#define LP_PREEMPT_REQUEST 1
158#define LP_PARPORT_CLAIMED 2
159
160/* --- low-level port access ----------------------------------- */
161
162#define r_dtr(x) (parport_read_data(lp_table[(x)].dev->port))
163#define r_str(x) (parport_read_status(lp_table[(x)].dev->port))
164#define w_ctr(x,y) do { parport_write_control(lp_table[(x)].dev->port, (y)); } while (0)
165#define w_dtr(x,y) do { parport_write_data(lp_table[(x)].dev->port, (y)); } while (0)
166
167/* Claim the parport or block trying unless we've already claimed it */
168static void lp_claim_parport_or_block(struct lp_struct *this_lp)
169{
170 if (!test_and_set_bit(LP_PARPORT_CLAIMED, &this_lp->bits)) {
171 parport_claim_or_block(this_lp->dev);
172 }
173}
174
175/* Claim the parport or block trying unless we've already claimed it */
176static void lp_release_parport(struct lp_struct *this_lp)
177{
178 if (test_and_clear_bit(LP_PARPORT_CLAIMED, &this_lp->bits)) {
179 parport_release(this_lp->dev);
180 }
181}
182
183
184
185static int lp_preempt(void *handle)
186{
187 struct lp_struct *this_lp = (struct lp_struct *)handle;
188 set_bit(LP_PREEMPT_REQUEST, &this_lp->bits);
189 return 1;
190}
191
192
193/*
194 * Try to negotiate to a new mode; if unsuccessful negotiate to
195 * compatibility mode. Return the mode we ended up in.
196 */
197static int lp_negotiate(struct parport *port, int mode)
198{
199 if (parport_negotiate(port, mode) != 0) {
200 mode = IEEE1284_MODE_COMPAT;
201 parport_negotiate(port, mode);
202 }
203
204 return mode;
205}
206
207static int lp_reset(int minor)
208{
209 int retval;
210 lp_claim_parport_or_block(&lp_table[minor]);
211 w_ctr(minor, LP_PSELECP);
212 udelay(LP_DELAY);
213 w_ctr(minor, LP_PSELECP | LP_PINITP);
214 retval = r_str(minor);
215 lp_release_parport(&lp_table[minor]);
216 return retval;
217}
218
219static void lp_error(int minor)
220{
221 DEFINE_WAIT(wait);
222 int polling;
223
224 if (LP_F(minor) & LP_ABORT)
225 return;
226
227 polling = lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE;
228 if (polling)
229 lp_release_parport(&lp_table[minor]);
230 prepare_to_wait(&lp_table[minor].waitq, &wait, TASK_INTERRUPTIBLE);
231 schedule_timeout(LP_TIMEOUT_POLLED);
232 finish_wait(&lp_table[minor].waitq, &wait);
233 if (polling)
234 lp_claim_parport_or_block(&lp_table[minor]);
235 else
236 parport_yield_blocking(lp_table[minor].dev);
237}
238
239static int lp_check_status(int minor)
240{
241 int error = 0;
242 unsigned int last = lp_table[minor].last_error;
243 unsigned char status = r_str(minor);
244 if ((status & LP_PERRORP) && !(LP_F(minor) & LP_CAREFUL))
245 /* No error. */
246 last = 0;
247 else if ((status & LP_POUTPA)) {
248 if (last != LP_POUTPA) {
249 last = LP_POUTPA;
250 printk(KERN_INFO "lp%d out of paper\n", minor);
251 }
252 error = -ENOSPC;
253 } else if (!(status & LP_PSELECD)) {
254 if (last != LP_PSELECD) {
255 last = LP_PSELECD;
256 printk(KERN_INFO "lp%d off-line\n", minor);
257 }
258 error = -EIO;
259 } else if (!(status & LP_PERRORP)) {
260 if (last != LP_PERRORP) {
261 last = LP_PERRORP;
262 printk(KERN_INFO "lp%d on fire\n", minor);
263 }
264 error = -EIO;
265 } else {
266 last = 0; /* Come here if LP_CAREFUL is set and no
267 errors are reported. */
268 }
269
270 lp_table[minor].last_error = last;
271
272 if (last != 0)
273 lp_error(minor);
274
275 return error;
276}
277
278static int lp_wait_ready(int minor, int nonblock)
279{
280 int error = 0;
281
282 /* If we're not in compatibility mode, we're ready now! */
283 if (lp_table[minor].current_mode != IEEE1284_MODE_COMPAT) {
284 return 0;
285 }
286
287 do {
288 error = lp_check_status(minor);
289 if (error && (nonblock || (LP_F(minor) & LP_ABORT)))
290 break;
291 if (signal_pending(current)) {
292 error = -EINTR;
293 break;
294 }
295 } while (error);
296 return error;
297}
298
299static ssize_t lp_write(struct file *file, const char __user *buf,
300 size_t count, loff_t *ppos)
301{
302 unsigned int minor = iminor(file_inode(file));
303 struct parport *port = lp_table[minor].dev->port;
304 char *kbuf = lp_table[minor].lp_buffer;
305 ssize_t retv = 0;
306 ssize_t written;
307 size_t copy_size = count;
308 int nonblock = ((file->f_flags & O_NONBLOCK) ||
309 (LP_F(minor) & LP_ABORT));
310
311#ifdef LP_STATS
312 if (time_after(jiffies, lp_table[minor].lastcall + LP_TIME(minor)))
313 lp_table[minor].runchars = 0;
314
315 lp_table[minor].lastcall = jiffies;
316#endif
317
318 /* Need to copy the data from user-space. */
319 if (copy_size > LP_BUFFER_SIZE)
320 copy_size = LP_BUFFER_SIZE;
321
322 if (mutex_lock_interruptible(&lp_table[minor].port_mutex))
323 return -EINTR;
324
325 if (copy_from_user(kbuf, buf, copy_size)) {
326 retv = -EFAULT;
327 goto out_unlock;
328 }
329
330 /* Claim Parport or sleep until it becomes available
331 */
332 lp_claim_parport_or_block(&lp_table[minor]);
333 /* Go to the proper mode. */
334 lp_table[minor].current_mode = lp_negotiate(port,
335 lp_table[minor].best_mode);
336
337 parport_set_timeout(lp_table[minor].dev,
338 (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK
339 : lp_table[minor].timeout));
340
341 if ((retv = lp_wait_ready(minor, nonblock)) == 0)
342 do {
343 /* Write the data. */
344 written = parport_write(port, kbuf, copy_size);
345 if (written > 0) {
346 copy_size -= written;
347 count -= written;
348 buf += written;
349 retv += written;
350 }
351
352 if (signal_pending(current)) {
353 if (retv == 0)
354 retv = -EINTR;
355
356 break;
357 }
358
359 if (copy_size > 0) {
360 /* incomplete write -> check error ! */
361 int error;
362
363 parport_negotiate(lp_table[minor].dev->port,
364 IEEE1284_MODE_COMPAT);
365 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
366
367 error = lp_wait_ready(minor, nonblock);
368
369 if (error) {
370 if (retv == 0)
371 retv = error;
372 break;
373 } else if (nonblock) {
374 if (retv == 0)
375 retv = -EAGAIN;
376 break;
377 }
378
379 parport_yield_blocking(lp_table[minor].dev);
380 lp_table[minor].current_mode
381 = lp_negotiate(port,
382 lp_table[minor].best_mode);
383
384 } else if (need_resched())
385 schedule();
386
387 if (count) {
388 copy_size = count;
389 if (copy_size > LP_BUFFER_SIZE)
390 copy_size = LP_BUFFER_SIZE;
391
392 if (copy_from_user(kbuf, buf, copy_size)) {
393 if (retv == 0)
394 retv = -EFAULT;
395 break;
396 }
397 }
398 } while (count > 0);
399
400 if (test_and_clear_bit(LP_PREEMPT_REQUEST,
401 &lp_table[minor].bits)) {
402 printk(KERN_INFO "lp%d releasing parport\n", minor);
403 parport_negotiate(lp_table[minor].dev->port,
404 IEEE1284_MODE_COMPAT);
405 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
406 lp_release_parport(&lp_table[minor]);
407 }
408out_unlock:
409 mutex_unlock(&lp_table[minor].port_mutex);
410
411 return retv;
412}
413
414#ifdef CONFIG_PARPORT_1284
415
416/* Status readback conforming to ieee1284 */
417static ssize_t lp_read(struct file *file, char __user *buf,
418 size_t count, loff_t *ppos)
419{
420 DEFINE_WAIT(wait);
421 unsigned int minor=iminor(file_inode(file));
422 struct parport *port = lp_table[minor].dev->port;
423 ssize_t retval = 0;
424 char *kbuf = lp_table[minor].lp_buffer;
425 int nonblock = ((file->f_flags & O_NONBLOCK) ||
426 (LP_F(minor) & LP_ABORT));
427
428 if (count > LP_BUFFER_SIZE)
429 count = LP_BUFFER_SIZE;
430
431 if (mutex_lock_interruptible(&lp_table[minor].port_mutex))
432 return -EINTR;
433
434 lp_claim_parport_or_block(&lp_table[minor]);
435
436 parport_set_timeout(lp_table[minor].dev,
437 (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK
438 : lp_table[minor].timeout));
439
440 parport_negotiate(lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
441 if (parport_negotiate(lp_table[minor].dev->port,
442 IEEE1284_MODE_NIBBLE)) {
443 retval = -EIO;
444 goto out;
445 }
446
447 while (retval == 0) {
448 retval = parport_read(port, kbuf, count);
449
450 if (retval > 0)
451 break;
452
453 if (nonblock) {
454 retval = -EAGAIN;
455 break;
456 }
457
458 /* Wait for data. */
459
460 if (lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE) {
461 parport_negotiate(lp_table[minor].dev->port,
462 IEEE1284_MODE_COMPAT);
463 lp_error(minor);
464 if (parport_negotiate(lp_table[minor].dev->port,
465 IEEE1284_MODE_NIBBLE)) {
466 retval = -EIO;
467 goto out;
468 }
469 } else {
470 prepare_to_wait(&lp_table[minor].waitq, &wait, TASK_INTERRUPTIBLE);
471 schedule_timeout(LP_TIMEOUT_POLLED);
472 finish_wait(&lp_table[minor].waitq, &wait);
473 }
474
475 if (signal_pending(current)) {
476 retval = -ERESTARTSYS;
477 break;
478 }
479
480 cond_resched();
481 }
482 parport_negotiate(lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
483 out:
484 lp_release_parport(&lp_table[minor]);
485
486 if (retval > 0 && copy_to_user(buf, kbuf, retval))
487 retval = -EFAULT;
488
489 mutex_unlock(&lp_table[minor].port_mutex);
490
491 return retval;
492}
493
494#endif /* IEEE 1284 support */
495
496static int lp_open(struct inode *inode, struct file *file)
497{
498 unsigned int minor = iminor(inode);
499 int ret = 0;
500
501 mutex_lock(&lp_mutex);
502 if (minor >= LP_NO) {
503 ret = -ENXIO;
504 goto out;
505 }
506 if ((LP_F(minor) & LP_EXIST) == 0) {
507 ret = -ENXIO;
508 goto out;
509 }
510 if (test_and_set_bit(LP_BUSY_BIT_POS, &LP_F(minor))) {
511 ret = -EBUSY;
512 goto out;
513 }
514 /* If ABORTOPEN is set and the printer is offline or out of paper,
515 we may still want to open it to perform ioctl()s. Therefore we
516 have commandeered O_NONBLOCK, even though it is being used in
517 a non-standard manner. This is strictly a Linux hack, and
518 should most likely only ever be used by the tunelp application. */
519 if ((LP_F(minor) & LP_ABORTOPEN) && !(file->f_flags & O_NONBLOCK)) {
520 int status;
521 lp_claim_parport_or_block(&lp_table[minor]);
522 status = r_str(minor);
523 lp_release_parport(&lp_table[minor]);
524 if (status & LP_POUTPA) {
525 printk(KERN_INFO "lp%d out of paper\n", minor);
526 LP_F(minor) &= ~LP_BUSY;
527 ret = -ENOSPC;
528 goto out;
529 } else if (!(status & LP_PSELECD)) {
530 printk(KERN_INFO "lp%d off-line\n", minor);
531 LP_F(minor) &= ~LP_BUSY;
532 ret = -EIO;
533 goto out;
534 } else if (!(status & LP_PERRORP)) {
535 printk(KERN_ERR "lp%d printer error\n", minor);
536 LP_F(minor) &= ~LP_BUSY;
537 ret = -EIO;
538 goto out;
539 }
540 }
541 lp_table[minor].lp_buffer = kmalloc(LP_BUFFER_SIZE, GFP_KERNEL);
542 if (!lp_table[minor].lp_buffer) {
543 LP_F(minor) &= ~LP_BUSY;
544 ret = -ENOMEM;
545 goto out;
546 }
547 /* Determine if the peripheral supports ECP mode */
548 lp_claim_parport_or_block(&lp_table[minor]);
549 if ( (lp_table[minor].dev->port->modes & PARPORT_MODE_ECP) &&
550 !parport_negotiate(lp_table[minor].dev->port,
551 IEEE1284_MODE_ECP)) {
552 printk(KERN_INFO "lp%d: ECP mode\n", minor);
553 lp_table[minor].best_mode = IEEE1284_MODE_ECP;
554 } else {
555 lp_table[minor].best_mode = IEEE1284_MODE_COMPAT;
556 }
557 /* Leave peripheral in compatibility mode */
558 parport_negotiate(lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
559 lp_release_parport(&lp_table[minor]);
560 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
561out:
562 mutex_unlock(&lp_mutex);
563 return ret;
564}
565
566static int lp_release(struct inode *inode, struct file *file)
567{
568 unsigned int minor = iminor(inode);
569
570 lp_claim_parport_or_block(&lp_table[minor]);
571 parport_negotiate(lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
572 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
573 lp_release_parport(&lp_table[minor]);
574 kfree(lp_table[minor].lp_buffer);
575 lp_table[minor].lp_buffer = NULL;
576 LP_F(minor) &= ~LP_BUSY;
577 return 0;
578}
579
580static int lp_do_ioctl(unsigned int minor, unsigned int cmd,
581 unsigned long arg, void __user *argp)
582{
583 int status;
584 int retval = 0;
585
586#ifdef LP_DEBUG
587 printk(KERN_DEBUG "lp%d ioctl, cmd: 0x%x, arg: 0x%lx\n", minor, cmd, arg);
588#endif
589 if (minor >= LP_NO)
590 return -ENODEV;
591 if ((LP_F(minor) & LP_EXIST) == 0)
592 return -ENODEV;
593 switch ( cmd ) {
594 case LPTIME:
595 if (arg > UINT_MAX / HZ)
596 return -EINVAL;
597 LP_TIME(minor) = arg * HZ/100;
598 break;
599 case LPCHAR:
600 LP_CHAR(minor) = arg;
601 break;
602 case LPABORT:
603 if (arg)
604 LP_F(minor) |= LP_ABORT;
605 else
606 LP_F(minor) &= ~LP_ABORT;
607 break;
608 case LPABORTOPEN:
609 if (arg)
610 LP_F(minor) |= LP_ABORTOPEN;
611 else
612 LP_F(minor) &= ~LP_ABORTOPEN;
613 break;
614 case LPCAREFUL:
615 if (arg)
616 LP_F(minor) |= LP_CAREFUL;
617 else
618 LP_F(minor) &= ~LP_CAREFUL;
619 break;
620 case LPWAIT:
621 LP_WAIT(minor) = arg;
622 break;
623 case LPSETIRQ:
624 return -EINVAL;
625 break;
626 case LPGETIRQ:
627 if (copy_to_user(argp, &LP_IRQ(minor),
628 sizeof(int)))
629 return -EFAULT;
630 break;
631 case LPGETSTATUS:
632 if (mutex_lock_interruptible(&lp_table[minor].port_mutex))
633 return -EINTR;
634 lp_claim_parport_or_block(&lp_table[minor]);
635 status = r_str(minor);
636 lp_release_parport(&lp_table[minor]);
637 mutex_unlock(&lp_table[minor].port_mutex);
638
639 if (copy_to_user(argp, &status, sizeof(int)))
640 return -EFAULT;
641 break;
642 case LPRESET:
643 lp_reset(minor);
644 break;
645#ifdef LP_STATS
646 case LPGETSTATS:
647 if (copy_to_user(argp, &LP_STAT(minor),
648 sizeof(struct lp_stats)))
649 return -EFAULT;
650 if (capable(CAP_SYS_ADMIN))
651 memset(&LP_STAT(minor), 0,
652 sizeof(struct lp_stats));
653 break;
654#endif
655 case LPGETFLAGS:
656 status = LP_F(minor);
657 if (copy_to_user(argp, &status, sizeof(int)))
658 return -EFAULT;
659 break;
660
661 default:
662 retval = -EINVAL;
663 }
664 return retval;
665}
666
667static int lp_set_timeout(unsigned int minor, s64 tv_sec, long tv_usec)
668{
669 long to_jiffies;
670
671 /* Convert to jiffies, place in lp_table */
672 if (tv_sec < 0 || tv_usec < 0)
673 return -EINVAL;
674
675 /*
676 * we used to not check, so let's not make this fatal,
677 * but deal with user space passing a 32-bit tv_nsec in
678 * a 64-bit field, capping the timeout to 1 second
679 * worth of microseconds, and capping the total at
680 * MAX_JIFFY_OFFSET.
681 */
682 if (tv_usec > 999999)
683 tv_usec = 999999;
684
685 if (tv_sec >= MAX_SEC_IN_JIFFIES - 1) {
686 to_jiffies = MAX_JIFFY_OFFSET;
687 } else {
688 to_jiffies = DIV_ROUND_UP(tv_usec, 1000000/HZ);
689 to_jiffies += tv_sec * (long) HZ;
690 }
691
692 if (to_jiffies <= 0) {
693 return -EINVAL;
694 }
695 lp_table[minor].timeout = to_jiffies;
696 return 0;
697}
698
699static int lp_set_timeout32(unsigned int minor, void __user *arg)
700{
701 s32 karg[2];
702
703 if (copy_from_user(karg, arg, sizeof(karg)))
704 return -EFAULT;
705
706 return lp_set_timeout(minor, karg[0], karg[1]);
707}
708
709static int lp_set_timeout64(unsigned int minor, void __user *arg)
710{
711 s64 karg[2];
712
713 if (copy_from_user(karg, arg, sizeof(karg)))
714 return -EFAULT;
715
716 /* sparc64 suseconds_t is 32-bit only */
717 if (IS_ENABLED(CONFIG_SPARC64) && !in_compat_syscall())
718 karg[1] >>= 32;
719
720 return lp_set_timeout(minor, karg[0], karg[1]);
721}
722
723static long lp_ioctl(struct file *file, unsigned int cmd,
724 unsigned long arg)
725{
726 unsigned int minor;
727 int ret;
728
729 minor = iminor(file_inode(file));
730 mutex_lock(&lp_mutex);
731 switch (cmd) {
732 case LPSETTIMEOUT_OLD:
733 if (BITS_PER_LONG == 32) {
734 ret = lp_set_timeout32(minor, (void __user *)arg);
735 break;
736 }
737 fallthrough; /* for 64-bit */
738 case LPSETTIMEOUT_NEW:
739 ret = lp_set_timeout64(minor, (void __user *)arg);
740 break;
741 default:
742 ret = lp_do_ioctl(minor, cmd, arg, (void __user *)arg);
743 break;
744 }
745 mutex_unlock(&lp_mutex);
746
747 return ret;
748}
749
750#ifdef CONFIG_COMPAT
751static long lp_compat_ioctl(struct file *file, unsigned int cmd,
752 unsigned long arg)
753{
754 unsigned int minor;
755 int ret;
756
757 minor = iminor(file_inode(file));
758 mutex_lock(&lp_mutex);
759 switch (cmd) {
760 case LPSETTIMEOUT_OLD:
761 if (!COMPAT_USE_64BIT_TIME) {
762 ret = lp_set_timeout32(minor, (void __user *)arg);
763 break;
764 }
765 fallthrough; /* for x32 mode */
766 case LPSETTIMEOUT_NEW:
767 ret = lp_set_timeout64(minor, (void __user *)arg);
768 break;
769#ifdef LP_STATS
770 case LPGETSTATS:
771 /* FIXME: add an implementation if you set LP_STATS */
772 ret = -EINVAL;
773 break;
774#endif
775 default:
776 ret = lp_do_ioctl(minor, cmd, arg, compat_ptr(arg));
777 break;
778 }
779 mutex_unlock(&lp_mutex);
780
781 return ret;
782}
783#endif
784
785static const struct file_operations lp_fops = {
786 .owner = THIS_MODULE,
787 .write = lp_write,
788 .unlocked_ioctl = lp_ioctl,
789#ifdef CONFIG_COMPAT
790 .compat_ioctl = lp_compat_ioctl,
791#endif
792 .open = lp_open,
793 .release = lp_release,
794#ifdef CONFIG_PARPORT_1284
795 .read = lp_read,
796#endif
797 .llseek = noop_llseek,
798};
799
800/* --- support for console on the line printer ----------------- */
801
802#ifdef CONFIG_LP_CONSOLE
803
804#define CONSOLE_LP 0
805
806/* If the printer is out of paper, we can either lose the messages or
807 * stall until the printer is happy again. Define CONSOLE_LP_STRICT
808 * non-zero to get the latter behaviour. */
809#define CONSOLE_LP_STRICT 1
810
811/* The console must be locked when we get here. */
812
813static void lp_console_write(struct console *co, const char *s,
814 unsigned count)
815{
816 struct pardevice *dev = lp_table[CONSOLE_LP].dev;
817 struct parport *port = dev->port;
818 ssize_t written;
819
820 if (parport_claim(dev))
821 /* Nothing we can do. */
822 return;
823
824 parport_set_timeout(dev, 0);
825
826 /* Go to compatibility mode. */
827 parport_negotiate(port, IEEE1284_MODE_COMPAT);
828
829 do {
830 /* Write the data, converting LF->CRLF as we go. */
831 ssize_t canwrite = count;
832 char *lf = memchr(s, '\n', count);
833 if (lf)
834 canwrite = lf - s;
835
836 if (canwrite > 0) {
837 written = parport_write(port, s, canwrite);
838
839 if (written <= 0)
840 continue;
841
842 s += written;
843 count -= written;
844 canwrite -= written;
845 }
846
847 if (lf && canwrite <= 0) {
848 const char *crlf = "\r\n";
849 int i = 2;
850
851 /* Dodge the original '\n', and put '\r\n' instead. */
852 s++;
853 count--;
854 do {
855 written = parport_write(port, crlf, i);
856 if (written > 0)
857 i -= written, crlf += written;
858 } while (i > 0 && (CONSOLE_LP_STRICT || written > 0));
859 }
860 } while (count > 0 && (CONSOLE_LP_STRICT || written > 0));
861
862 parport_release(dev);
863}
864
865static struct console lpcons = {
866 .name = "lp",
867 .write = lp_console_write,
868 .flags = CON_PRINTBUFFER,
869};
870
871#endif /* console on line printer */
872
873/* --- initialisation code ------------------------------------- */
874
875static int parport_nr[LP_NO] = { [0 ... LP_NO-1] = LP_PARPORT_UNSPEC };
876static char *parport[LP_NO];
877static bool reset;
878
879module_param_array(parport, charp, NULL, 0);
880module_param(reset, bool, 0);
881
882#ifndef MODULE
883static int __init lp_setup(char *str)
884{
885 static int parport_ptr;
886 int x;
887
888 if (get_option(&str, &x)) {
889 if (x == 0) {
890 /* disable driver on "lp=" or "lp=0" */
891 parport_nr[0] = LP_PARPORT_OFF;
892 } else {
893 printk(KERN_WARNING "warning: 'lp=0x%x' is deprecated, ignored\n", x);
894 return 0;
895 }
896 } else if (!strncmp(str, "parport", 7)) {
897 int n = simple_strtoul(str+7, NULL, 10);
898 if (parport_ptr < LP_NO)
899 parport_nr[parport_ptr++] = n;
900 else
901 printk(KERN_INFO "lp: too many ports, %s ignored.\n",
902 str);
903 } else if (!strcmp(str, "auto")) {
904 parport_nr[0] = LP_PARPORT_AUTO;
905 } else if (!strcmp(str, "none")) {
906 if (parport_ptr < LP_NO)
907 parport_nr[parport_ptr++] = LP_PARPORT_NONE;
908 else
909 printk(KERN_INFO "lp: too many ports, %s ignored.\n",
910 str);
911 } else if (!strcmp(str, "reset")) {
912 reset = true;
913 }
914 return 1;
915}
916#endif
917
918static int lp_register(int nr, struct parport *port)
919{
920 struct pardev_cb ppdev_cb;
921
922 memset(&ppdev_cb, 0, sizeof(ppdev_cb));
923 ppdev_cb.preempt = lp_preempt;
924 ppdev_cb.private = &lp_table[nr];
925 lp_table[nr].dev = parport_register_dev_model(port, "lp",
926 &ppdev_cb, nr);
927 if (lp_table[nr].dev == NULL)
928 return 1;
929 lp_table[nr].flags |= LP_EXIST;
930
931 if (reset)
932 lp_reset(nr);
933
934 device_create(lp_class, port->dev, MKDEV(LP_MAJOR, nr), NULL,
935 "lp%d", nr);
936
937 printk(KERN_INFO "lp%d: using %s (%s).\n", nr, port->name,
938 (port->irq == PARPORT_IRQ_NONE)?"polling":"interrupt-driven");
939
940#ifdef CONFIG_LP_CONSOLE
941 if (!nr) {
942 if (port->modes & PARPORT_MODE_SAFEININT) {
943 register_console(&lpcons);
944 console_registered = port;
945 printk(KERN_INFO "lp%d: console ready\n", CONSOLE_LP);
946 } else
947 printk(KERN_ERR "lp%d: cannot run console on %s\n",
948 CONSOLE_LP, port->name);
949 }
950#endif
951 port_num[nr] = port->number;
952
953 return 0;
954}
955
956static void lp_attach(struct parport *port)
957{
958 unsigned int i;
959
960 switch (parport_nr[0]) {
961 case LP_PARPORT_UNSPEC:
962 case LP_PARPORT_AUTO:
963 if (parport_nr[0] == LP_PARPORT_AUTO &&
964 port->probe_info[0].class != PARPORT_CLASS_PRINTER)
965 return;
966 if (lp_count == LP_NO) {
967 printk(KERN_INFO "lp: ignoring parallel port (max. %d)\n",LP_NO);
968 return;
969 }
970 for (i = 0; i < LP_NO; i++)
971 if (port_num[i] == -1)
972 break;
973
974 if (!lp_register(i, port))
975 lp_count++;
976 break;
977
978 default:
979 for (i = 0; i < LP_NO; i++) {
980 if (port->number == parport_nr[i]) {
981 if (!lp_register(i, port))
982 lp_count++;
983 break;
984 }
985 }
986 break;
987 }
988}
989
990static void lp_detach(struct parport *port)
991{
992 int n;
993
994 /* Write this some day. */
995#ifdef CONFIG_LP_CONSOLE
996 if (console_registered == port) {
997 unregister_console(&lpcons);
998 console_registered = NULL;
999 }
1000#endif /* CONFIG_LP_CONSOLE */
1001
1002 for (n = 0; n < LP_NO; n++) {
1003 if (port_num[n] == port->number) {
1004 port_num[n] = -1;
1005 lp_count--;
1006 device_destroy(lp_class, MKDEV(LP_MAJOR, n));
1007 parport_unregister_device(lp_table[n].dev);
1008 }
1009 }
1010}
1011
1012static struct parport_driver lp_driver = {
1013 .name = "lp",
1014 .match_port = lp_attach,
1015 .detach = lp_detach,
1016 .devmodel = true,
1017};
1018
1019static int __init lp_init(void)
1020{
1021 int i, err = 0;
1022
1023 if (parport_nr[0] == LP_PARPORT_OFF)
1024 return 0;
1025
1026 for (i = 0; i < LP_NO; i++) {
1027 lp_table[i].dev = NULL;
1028 lp_table[i].flags = 0;
1029 lp_table[i].chars = LP_INIT_CHAR;
1030 lp_table[i].time = LP_INIT_TIME;
1031 lp_table[i].wait = LP_INIT_WAIT;
1032 lp_table[i].lp_buffer = NULL;
1033#ifdef LP_STATS
1034 lp_table[i].lastcall = 0;
1035 lp_table[i].runchars = 0;
1036 memset(&lp_table[i].stats, 0, sizeof(struct lp_stats));
1037#endif
1038 lp_table[i].last_error = 0;
1039 init_waitqueue_head(&lp_table[i].waitq);
1040 init_waitqueue_head(&lp_table[i].dataq);
1041 mutex_init(&lp_table[i].port_mutex);
1042 lp_table[i].timeout = 10 * HZ;
1043 port_num[i] = -1;
1044 }
1045
1046 if (register_chrdev(LP_MAJOR, "lp", &lp_fops)) {
1047 printk(KERN_ERR "lp: unable to get major %d\n", LP_MAJOR);
1048 return -EIO;
1049 }
1050
1051 lp_class = class_create(THIS_MODULE, "printer");
1052 if (IS_ERR(lp_class)) {
1053 err = PTR_ERR(lp_class);
1054 goto out_reg;
1055 }
1056
1057 if (parport_register_driver(&lp_driver)) {
1058 printk(KERN_ERR "lp: unable to register with parport\n");
1059 err = -EIO;
1060 goto out_class;
1061 }
1062
1063 if (!lp_count) {
1064 printk(KERN_INFO "lp: driver loaded but no devices found\n");
1065#ifndef CONFIG_PARPORT_1284
1066 if (parport_nr[0] == LP_PARPORT_AUTO)
1067 printk(KERN_INFO "lp: (is IEEE 1284 support enabled?)\n");
1068#endif
1069 }
1070
1071 return 0;
1072
1073out_class:
1074 class_destroy(lp_class);
1075out_reg:
1076 unregister_chrdev(LP_MAJOR, "lp");
1077 return err;
1078}
1079
1080static int __init lp_init_module(void)
1081{
1082 if (parport[0]) {
1083 /* The user gave some parameters. Let's see what they were. */
1084 if (!strncmp(parport[0], "auto", 4))
1085 parport_nr[0] = LP_PARPORT_AUTO;
1086 else {
1087 int n;
1088 for (n = 0; n < LP_NO && parport[n]; n++) {
1089 if (!strncmp(parport[n], "none", 4))
1090 parport_nr[n] = LP_PARPORT_NONE;
1091 else {
1092 char *ep;
1093 unsigned long r = simple_strtoul(parport[n], &ep, 0);
1094 if (ep != parport[n])
1095 parport_nr[n] = r;
1096 else {
1097 printk(KERN_ERR "lp: bad port specifier `%s'\n", parport[n]);
1098 return -ENODEV;
1099 }
1100 }
1101 }
1102 }
1103 }
1104
1105 return lp_init();
1106}
1107
1108static void lp_cleanup_module(void)
1109{
1110 parport_unregister_driver(&lp_driver);
1111
1112#ifdef CONFIG_LP_CONSOLE
1113 unregister_console(&lpcons);
1114#endif
1115
1116 unregister_chrdev(LP_MAJOR, "lp");
1117 class_destroy(lp_class);
1118}
1119
1120__setup("lp=", lp_setup);
1121module_init(lp_init_module);
1122module_exit(lp_cleanup_module);
1123
1124MODULE_ALIAS_CHARDEV_MAJOR(LP_MAJOR);
1125MODULE_LICENSE("GPL");
1/*
2 * Generic parallel printer driver
3 *
4 * Copyright (C) 1992 by Jim Weigand and Linus Torvalds
5 * Copyright (C) 1992,1993 by Michael K. Johnson
6 * - Thanks much to Gunter Windau for pointing out to me where the error
7 * checking ought to be.
8 * Copyright (C) 1993 by Nigel Gamble (added interrupt code)
9 * Copyright (C) 1994 by Alan Cox (Modularised it)
10 * LPCAREFUL, LPABORT, LPGETSTATUS added by Chris Metcalf, metcalf@lcs.mit.edu
11 * Statistics and support for slow printers by Rob Janssen, rob@knoware.nl
12 * "lp=" command line parameters added by Grant Guenther, grant@torque.net
13 * lp_read (Status readback) support added by Carsten Gross,
14 * carsten@sol.wohnheim.uni-ulm.de
15 * Support for parport by Philip Blundell <philb@gnu.org>
16 * Parport sharing hacking by Andrea Arcangeli
17 * Fixed kernel_(to/from)_user memory copy to check for errors
18 * by Riccardo Facchetti <fizban@tin.it>
19 * 22-JAN-1998 Added support for devfs Richard Gooch <rgooch@atnf.csiro.au>
20 * Redesigned interrupt handling for handle printers with buggy handshake
21 * by Andrea Arcangeli, 11 May 1998
22 * Full efficient handling of printer with buggy irq handshake (now I have
23 * understood the meaning of the strange handshake). This is done sending new
24 * characters if the interrupt is just happened, even if the printer say to
25 * be still BUSY. This is needed at least with Epson Stylus Color. To enable
26 * the new TRUST_IRQ mode read the `LP OPTIMIZATION' section below...
27 * Fixed the irq on the rising edge of the strobe case.
28 * Obsoleted the CAREFUL flag since a printer that doesn' t work with
29 * CAREFUL will block a bit after in lp_check_status().
30 * Andrea Arcangeli, 15 Oct 1998
31 * Obsoleted and removed all the lowlevel stuff implemented in the last
32 * month to use the IEEE1284 functions (that handle the _new_ compatibilty
33 * mode fine).
34 */
35
36/* This driver should, in theory, work with any parallel port that has an
37 * appropriate low-level driver; all I/O is done through the parport
38 * abstraction layer.
39 *
40 * If this driver is built into the kernel, you can configure it using the
41 * kernel command-line. For example:
42 *
43 * lp=parport1,none,parport2 (bind lp0 to parport1, disable lp1 and
44 * bind lp2 to parport2)
45 *
46 * lp=auto (assign lp devices to all ports that
47 * have printers attached, as determined
48 * by the IEEE-1284 autoprobe)
49 *
50 * lp=reset (reset the printer during
51 * initialisation)
52 *
53 * lp=off (disable the printer driver entirely)
54 *
55 * If the driver is loaded as a module, similar functionality is available
56 * using module parameters. The equivalent of the above commands would be:
57 *
58 * # insmod lp.o parport=1,none,2
59 *
60 * # insmod lp.o parport=auto
61 *
62 * # insmod lp.o reset=1
63 */
64
65/* COMPATIBILITY WITH OLD KERNELS
66 *
67 * Under Linux 2.0 and previous versions, lp devices were bound to ports at
68 * particular I/O addresses, as follows:
69 *
70 * lp0 0x3bc
71 * lp1 0x378
72 * lp2 0x278
73 *
74 * The new driver, by default, binds lp devices to parport devices as it
75 * finds them. This means that if you only have one port, it will be bound
76 * to lp0 regardless of its I/O address. If you need the old behaviour, you
77 * can force it using the parameters described above.
78 */
79
80/*
81 * The new interrupt handling code take care of the buggy handshake
82 * of some HP and Epson printer:
83 * ___
84 * ACK _______________ ___________
85 * |__|
86 * ____
87 * BUSY _________ _______
88 * |____________|
89 *
90 * I discovered this using the printer scanner that you can find at:
91 *
92 * ftp://e-mind.com/pub/linux/pscan/
93 *
94 * 11 May 98, Andrea Arcangeli
95 *
96 * My printer scanner run on an Epson Stylus Color show that such printer
97 * generates the irq on the _rising_ edge of the STROBE. Now lp handle
98 * this case fine too.
99 *
100 * 15 Oct 1998, Andrea Arcangeli
101 *
102 * The so called `buggy' handshake is really the well documented
103 * compatibility mode IEEE1284 handshake. They changed the well known
104 * Centronics handshake acking in the middle of busy expecting to not
105 * break drivers or legacy application, while they broken linux lp
106 * until I fixed it reverse engineering the protocol by hand some
107 * month ago...
108 *
109 * 14 Dec 1998, Andrea Arcangeli
110 *
111 * Copyright (C) 2000 by Tim Waugh (added LPSETTIMEOUT ioctl)
112 */
113
114#include <linux/module.h>
115#include <linux/init.h>
116
117#include <linux/errno.h>
118#include <linux/kernel.h>
119#include <linux/major.h>
120#include <linux/sched.h>
121#include <linux/slab.h>
122#include <linux/fcntl.h>
123#include <linux/delay.h>
124#include <linux/poll.h>
125#include <linux/console.h>
126#include <linux/device.h>
127#include <linux/wait.h>
128#include <linux/jiffies.h>
129#include <linux/mutex.h>
130#include <linux/compat.h>
131
132#include <linux/parport.h>
133#undef LP_STATS
134#include <linux/lp.h>
135
136#include <asm/irq.h>
137#include <asm/uaccess.h>
138
139/* if you have more than 8 printers, remember to increase LP_NO */
140#define LP_NO 8
141
142static DEFINE_MUTEX(lp_mutex);
143static struct lp_struct lp_table[LP_NO];
144
145static unsigned int lp_count = 0;
146static struct class *lp_class;
147
148#ifdef CONFIG_LP_CONSOLE
149static struct parport *console_registered;
150#endif /* CONFIG_LP_CONSOLE */
151
152#undef LP_DEBUG
153
154/* Bits used to manage claiming the parport device */
155#define LP_PREEMPT_REQUEST 1
156#define LP_PARPORT_CLAIMED 2
157
158/* --- low-level port access ----------------------------------- */
159
160#define r_dtr(x) (parport_read_data(lp_table[(x)].dev->port))
161#define r_str(x) (parport_read_status(lp_table[(x)].dev->port))
162#define w_ctr(x,y) do { parport_write_control(lp_table[(x)].dev->port, (y)); } while (0)
163#define w_dtr(x,y) do { parport_write_data(lp_table[(x)].dev->port, (y)); } while (0)
164
165/* Claim the parport or block trying unless we've already claimed it */
166static void lp_claim_parport_or_block(struct lp_struct *this_lp)
167{
168 if (!test_and_set_bit(LP_PARPORT_CLAIMED, &this_lp->bits)) {
169 parport_claim_or_block (this_lp->dev);
170 }
171}
172
173/* Claim the parport or block trying unless we've already claimed it */
174static void lp_release_parport(struct lp_struct *this_lp)
175{
176 if (test_and_clear_bit(LP_PARPORT_CLAIMED, &this_lp->bits)) {
177 parport_release (this_lp->dev);
178 }
179}
180
181
182
183static int lp_preempt(void *handle)
184{
185 struct lp_struct *this_lp = (struct lp_struct *)handle;
186 set_bit(LP_PREEMPT_REQUEST, &this_lp->bits);
187 return (1);
188}
189
190
191/*
192 * Try to negotiate to a new mode; if unsuccessful negotiate to
193 * compatibility mode. Return the mode we ended up in.
194 */
195static int lp_negotiate(struct parport * port, int mode)
196{
197 if (parport_negotiate (port, mode) != 0) {
198 mode = IEEE1284_MODE_COMPAT;
199 parport_negotiate (port, mode);
200 }
201
202 return (mode);
203}
204
205static int lp_reset(int minor)
206{
207 int retval;
208 lp_claim_parport_or_block (&lp_table[minor]);
209 w_ctr(minor, LP_PSELECP);
210 udelay (LP_DELAY);
211 w_ctr(minor, LP_PSELECP | LP_PINITP);
212 retval = r_str(minor);
213 lp_release_parport (&lp_table[minor]);
214 return retval;
215}
216
217static void lp_error (int minor)
218{
219 DEFINE_WAIT(wait);
220 int polling;
221
222 if (LP_F(minor) & LP_ABORT)
223 return;
224
225 polling = lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE;
226 if (polling) lp_release_parport (&lp_table[minor]);
227 prepare_to_wait(&lp_table[minor].waitq, &wait, TASK_INTERRUPTIBLE);
228 schedule_timeout(LP_TIMEOUT_POLLED);
229 finish_wait(&lp_table[minor].waitq, &wait);
230 if (polling) lp_claim_parport_or_block (&lp_table[minor]);
231 else parport_yield_blocking (lp_table[minor].dev);
232}
233
234static int lp_check_status(int minor)
235{
236 int error = 0;
237 unsigned int last = lp_table[minor].last_error;
238 unsigned char status = r_str(minor);
239 if ((status & LP_PERRORP) && !(LP_F(minor) & LP_CAREFUL))
240 /* No error. */
241 last = 0;
242 else if ((status & LP_POUTPA)) {
243 if (last != LP_POUTPA) {
244 last = LP_POUTPA;
245 printk(KERN_INFO "lp%d out of paper\n", minor);
246 }
247 error = -ENOSPC;
248 } else if (!(status & LP_PSELECD)) {
249 if (last != LP_PSELECD) {
250 last = LP_PSELECD;
251 printk(KERN_INFO "lp%d off-line\n", minor);
252 }
253 error = -EIO;
254 } else if (!(status & LP_PERRORP)) {
255 if (last != LP_PERRORP) {
256 last = LP_PERRORP;
257 printk(KERN_INFO "lp%d on fire\n", minor);
258 }
259 error = -EIO;
260 } else {
261 last = 0; /* Come here if LP_CAREFUL is set and no
262 errors are reported. */
263 }
264
265 lp_table[minor].last_error = last;
266
267 if (last != 0)
268 lp_error(minor);
269
270 return error;
271}
272
273static int lp_wait_ready(int minor, int nonblock)
274{
275 int error = 0;
276
277 /* If we're not in compatibility mode, we're ready now! */
278 if (lp_table[minor].current_mode != IEEE1284_MODE_COMPAT) {
279 return (0);
280 }
281
282 do {
283 error = lp_check_status (minor);
284 if (error && (nonblock || (LP_F(minor) & LP_ABORT)))
285 break;
286 if (signal_pending (current)) {
287 error = -EINTR;
288 break;
289 }
290 } while (error);
291 return error;
292}
293
294static ssize_t lp_write(struct file * file, const char __user * buf,
295 size_t count, loff_t *ppos)
296{
297 unsigned int minor = iminor(file_inode(file));
298 struct parport *port = lp_table[minor].dev->port;
299 char *kbuf = lp_table[minor].lp_buffer;
300 ssize_t retv = 0;
301 ssize_t written;
302 size_t copy_size = count;
303 int nonblock = ((file->f_flags & O_NONBLOCK) ||
304 (LP_F(minor) & LP_ABORT));
305
306#ifdef LP_STATS
307 if (time_after(jiffies, lp_table[minor].lastcall + LP_TIME(minor)))
308 lp_table[minor].runchars = 0;
309
310 lp_table[minor].lastcall = jiffies;
311#endif
312
313 /* Need to copy the data from user-space. */
314 if (copy_size > LP_BUFFER_SIZE)
315 copy_size = LP_BUFFER_SIZE;
316
317 if (mutex_lock_interruptible(&lp_table[minor].port_mutex))
318 return -EINTR;
319
320 if (copy_from_user (kbuf, buf, copy_size)) {
321 retv = -EFAULT;
322 goto out_unlock;
323 }
324
325 /* Claim Parport or sleep until it becomes available
326 */
327 lp_claim_parport_or_block (&lp_table[minor]);
328 /* Go to the proper mode. */
329 lp_table[minor].current_mode = lp_negotiate (port,
330 lp_table[minor].best_mode);
331
332 parport_set_timeout (lp_table[minor].dev,
333 (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK
334 : lp_table[minor].timeout));
335
336 if ((retv = lp_wait_ready (minor, nonblock)) == 0)
337 do {
338 /* Write the data. */
339 written = parport_write (port, kbuf, copy_size);
340 if (written > 0) {
341 copy_size -= written;
342 count -= written;
343 buf += written;
344 retv += written;
345 }
346
347 if (signal_pending (current)) {
348 if (retv == 0)
349 retv = -EINTR;
350
351 break;
352 }
353
354 if (copy_size > 0) {
355 /* incomplete write -> check error ! */
356 int error;
357
358 parport_negotiate (lp_table[minor].dev->port,
359 IEEE1284_MODE_COMPAT);
360 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
361
362 error = lp_wait_ready (minor, nonblock);
363
364 if (error) {
365 if (retv == 0)
366 retv = error;
367 break;
368 } else if (nonblock) {
369 if (retv == 0)
370 retv = -EAGAIN;
371 break;
372 }
373
374 parport_yield_blocking (lp_table[minor].dev);
375 lp_table[minor].current_mode
376 = lp_negotiate (port,
377 lp_table[minor].best_mode);
378
379 } else if (need_resched())
380 schedule ();
381
382 if (count) {
383 copy_size = count;
384 if (copy_size > LP_BUFFER_SIZE)
385 copy_size = LP_BUFFER_SIZE;
386
387 if (copy_from_user(kbuf, buf, copy_size)) {
388 if (retv == 0)
389 retv = -EFAULT;
390 break;
391 }
392 }
393 } while (count > 0);
394
395 if (test_and_clear_bit(LP_PREEMPT_REQUEST,
396 &lp_table[minor].bits)) {
397 printk(KERN_INFO "lp%d releasing parport\n", minor);
398 parport_negotiate (lp_table[minor].dev->port,
399 IEEE1284_MODE_COMPAT);
400 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
401 lp_release_parport (&lp_table[minor]);
402 }
403out_unlock:
404 mutex_unlock(&lp_table[minor].port_mutex);
405
406 return retv;
407}
408
409#ifdef CONFIG_PARPORT_1284
410
411/* Status readback conforming to ieee1284 */
412static ssize_t lp_read(struct file * file, char __user * buf,
413 size_t count, loff_t *ppos)
414{
415 DEFINE_WAIT(wait);
416 unsigned int minor=iminor(file_inode(file));
417 struct parport *port = lp_table[minor].dev->port;
418 ssize_t retval = 0;
419 char *kbuf = lp_table[minor].lp_buffer;
420 int nonblock = ((file->f_flags & O_NONBLOCK) ||
421 (LP_F(minor) & LP_ABORT));
422
423 if (count > LP_BUFFER_SIZE)
424 count = LP_BUFFER_SIZE;
425
426 if (mutex_lock_interruptible(&lp_table[minor].port_mutex))
427 return -EINTR;
428
429 lp_claim_parport_or_block (&lp_table[minor]);
430
431 parport_set_timeout (lp_table[minor].dev,
432 (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK
433 : lp_table[minor].timeout));
434
435 parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
436 if (parport_negotiate (lp_table[minor].dev->port,
437 IEEE1284_MODE_NIBBLE)) {
438 retval = -EIO;
439 goto out;
440 }
441
442 while (retval == 0) {
443 retval = parport_read (port, kbuf, count);
444
445 if (retval > 0)
446 break;
447
448 if (nonblock) {
449 retval = -EAGAIN;
450 break;
451 }
452
453 /* Wait for data. */
454
455 if (lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE) {
456 parport_negotiate (lp_table[minor].dev->port,
457 IEEE1284_MODE_COMPAT);
458 lp_error (minor);
459 if (parport_negotiate (lp_table[minor].dev->port,
460 IEEE1284_MODE_NIBBLE)) {
461 retval = -EIO;
462 goto out;
463 }
464 } else {
465 prepare_to_wait(&lp_table[minor].waitq, &wait, TASK_INTERRUPTIBLE);
466 schedule_timeout(LP_TIMEOUT_POLLED);
467 finish_wait(&lp_table[minor].waitq, &wait);
468 }
469
470 if (signal_pending (current)) {
471 retval = -ERESTARTSYS;
472 break;
473 }
474
475 cond_resched ();
476 }
477 parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
478 out:
479 lp_release_parport (&lp_table[minor]);
480
481 if (retval > 0 && copy_to_user (buf, kbuf, retval))
482 retval = -EFAULT;
483
484 mutex_unlock(&lp_table[minor].port_mutex);
485
486 return retval;
487}
488
489#endif /* IEEE 1284 support */
490
491static int lp_open(struct inode * inode, struct file * file)
492{
493 unsigned int minor = iminor(inode);
494 int ret = 0;
495
496 mutex_lock(&lp_mutex);
497 if (minor >= LP_NO) {
498 ret = -ENXIO;
499 goto out;
500 }
501 if ((LP_F(minor) & LP_EXIST) == 0) {
502 ret = -ENXIO;
503 goto out;
504 }
505 if (test_and_set_bit(LP_BUSY_BIT_POS, &LP_F(minor))) {
506 ret = -EBUSY;
507 goto out;
508 }
509 /* If ABORTOPEN is set and the printer is offline or out of paper,
510 we may still want to open it to perform ioctl()s. Therefore we
511 have commandeered O_NONBLOCK, even though it is being used in
512 a non-standard manner. This is strictly a Linux hack, and
513 should most likely only ever be used by the tunelp application. */
514 if ((LP_F(minor) & LP_ABORTOPEN) && !(file->f_flags & O_NONBLOCK)) {
515 int status;
516 lp_claim_parport_or_block (&lp_table[minor]);
517 status = r_str(minor);
518 lp_release_parport (&lp_table[minor]);
519 if (status & LP_POUTPA) {
520 printk(KERN_INFO "lp%d out of paper\n", minor);
521 LP_F(minor) &= ~LP_BUSY;
522 ret = -ENOSPC;
523 goto out;
524 } else if (!(status & LP_PSELECD)) {
525 printk(KERN_INFO "lp%d off-line\n", minor);
526 LP_F(minor) &= ~LP_BUSY;
527 ret = -EIO;
528 goto out;
529 } else if (!(status & LP_PERRORP)) {
530 printk(KERN_ERR "lp%d printer error\n", minor);
531 LP_F(minor) &= ~LP_BUSY;
532 ret = -EIO;
533 goto out;
534 }
535 }
536 lp_table[minor].lp_buffer = kmalloc(LP_BUFFER_SIZE, GFP_KERNEL);
537 if (!lp_table[minor].lp_buffer) {
538 LP_F(minor) &= ~LP_BUSY;
539 ret = -ENOMEM;
540 goto out;
541 }
542 /* Determine if the peripheral supports ECP mode */
543 lp_claim_parport_or_block (&lp_table[minor]);
544 if ( (lp_table[minor].dev->port->modes & PARPORT_MODE_ECP) &&
545 !parport_negotiate (lp_table[minor].dev->port,
546 IEEE1284_MODE_ECP)) {
547 printk (KERN_INFO "lp%d: ECP mode\n", minor);
548 lp_table[minor].best_mode = IEEE1284_MODE_ECP;
549 } else {
550 lp_table[minor].best_mode = IEEE1284_MODE_COMPAT;
551 }
552 /* Leave peripheral in compatibility mode */
553 parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
554 lp_release_parport (&lp_table[minor]);
555 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
556out:
557 mutex_unlock(&lp_mutex);
558 return ret;
559}
560
561static int lp_release(struct inode * inode, struct file * file)
562{
563 unsigned int minor = iminor(inode);
564
565 lp_claim_parport_or_block (&lp_table[minor]);
566 parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
567 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
568 lp_release_parport (&lp_table[minor]);
569 kfree(lp_table[minor].lp_buffer);
570 lp_table[minor].lp_buffer = NULL;
571 LP_F(minor) &= ~LP_BUSY;
572 return 0;
573}
574
575static int lp_do_ioctl(unsigned int minor, unsigned int cmd,
576 unsigned long arg, void __user *argp)
577{
578 int status;
579 int retval = 0;
580
581#ifdef LP_DEBUG
582 printk(KERN_DEBUG "lp%d ioctl, cmd: 0x%x, arg: 0x%lx\n", minor, cmd, arg);
583#endif
584 if (minor >= LP_NO)
585 return -ENODEV;
586 if ((LP_F(minor) & LP_EXIST) == 0)
587 return -ENODEV;
588 switch ( cmd ) {
589 case LPTIME:
590 if (arg > UINT_MAX / HZ)
591 return -EINVAL;
592 LP_TIME(minor) = arg * HZ/100;
593 break;
594 case LPCHAR:
595 LP_CHAR(minor) = arg;
596 break;
597 case LPABORT:
598 if (arg)
599 LP_F(minor) |= LP_ABORT;
600 else
601 LP_F(minor) &= ~LP_ABORT;
602 break;
603 case LPABORTOPEN:
604 if (arg)
605 LP_F(minor) |= LP_ABORTOPEN;
606 else
607 LP_F(minor) &= ~LP_ABORTOPEN;
608 break;
609 case LPCAREFUL:
610 if (arg)
611 LP_F(minor) |= LP_CAREFUL;
612 else
613 LP_F(minor) &= ~LP_CAREFUL;
614 break;
615 case LPWAIT:
616 LP_WAIT(minor) = arg;
617 break;
618 case LPSETIRQ:
619 return -EINVAL;
620 break;
621 case LPGETIRQ:
622 if (copy_to_user(argp, &LP_IRQ(minor),
623 sizeof(int)))
624 return -EFAULT;
625 break;
626 case LPGETSTATUS:
627 if (mutex_lock_interruptible(&lp_table[minor].port_mutex))
628 return -EINTR;
629 lp_claim_parport_or_block (&lp_table[minor]);
630 status = r_str(minor);
631 lp_release_parport (&lp_table[minor]);
632 mutex_unlock(&lp_table[minor].port_mutex);
633
634 if (copy_to_user(argp, &status, sizeof(int)))
635 return -EFAULT;
636 break;
637 case LPRESET:
638 lp_reset(minor);
639 break;
640#ifdef LP_STATS
641 case LPGETSTATS:
642 if (copy_to_user(argp, &LP_STAT(minor),
643 sizeof(struct lp_stats)))
644 return -EFAULT;
645 if (capable(CAP_SYS_ADMIN))
646 memset(&LP_STAT(minor), 0,
647 sizeof(struct lp_stats));
648 break;
649#endif
650 case LPGETFLAGS:
651 status = LP_F(minor);
652 if (copy_to_user(argp, &status, sizeof(int)))
653 return -EFAULT;
654 break;
655
656 default:
657 retval = -EINVAL;
658 }
659 return retval;
660}
661
662static int lp_set_timeout(unsigned int minor, struct timeval *par_timeout)
663{
664 long to_jiffies;
665
666 /* Convert to jiffies, place in lp_table */
667 if ((par_timeout->tv_sec < 0) ||
668 (par_timeout->tv_usec < 0)) {
669 return -EINVAL;
670 }
671 to_jiffies = DIV_ROUND_UP(par_timeout->tv_usec, 1000000/HZ);
672 to_jiffies += par_timeout->tv_sec * (long) HZ;
673 if (to_jiffies <= 0) {
674 return -EINVAL;
675 }
676 lp_table[minor].timeout = to_jiffies;
677 return 0;
678}
679
680static long lp_ioctl(struct file *file, unsigned int cmd,
681 unsigned long arg)
682{
683 unsigned int minor;
684 struct timeval par_timeout;
685 int ret;
686
687 minor = iminor(file_inode(file));
688 mutex_lock(&lp_mutex);
689 switch (cmd) {
690 case LPSETTIMEOUT:
691 if (copy_from_user(&par_timeout, (void __user *)arg,
692 sizeof (struct timeval))) {
693 ret = -EFAULT;
694 break;
695 }
696 ret = lp_set_timeout(minor, &par_timeout);
697 break;
698 default:
699 ret = lp_do_ioctl(minor, cmd, arg, (void __user *)arg);
700 break;
701 }
702 mutex_unlock(&lp_mutex);
703
704 return ret;
705}
706
707#ifdef CONFIG_COMPAT
708static long lp_compat_ioctl(struct file *file, unsigned int cmd,
709 unsigned long arg)
710{
711 unsigned int minor;
712 struct timeval par_timeout;
713 int ret;
714
715 minor = iminor(file_inode(file));
716 mutex_lock(&lp_mutex);
717 switch (cmd) {
718 case LPSETTIMEOUT:
719 if (compat_get_timeval(&par_timeout, compat_ptr(arg))) {
720 ret = -EFAULT;
721 break;
722 }
723 ret = lp_set_timeout(minor, &par_timeout);
724 break;
725#ifdef LP_STATS
726 case LPGETSTATS:
727 /* FIXME: add an implementation if you set LP_STATS */
728 ret = -EINVAL;
729 break;
730#endif
731 default:
732 ret = lp_do_ioctl(minor, cmd, arg, compat_ptr(arg));
733 break;
734 }
735 mutex_unlock(&lp_mutex);
736
737 return ret;
738}
739#endif
740
741static const struct file_operations lp_fops = {
742 .owner = THIS_MODULE,
743 .write = lp_write,
744 .unlocked_ioctl = lp_ioctl,
745#ifdef CONFIG_COMPAT
746 .compat_ioctl = lp_compat_ioctl,
747#endif
748 .open = lp_open,
749 .release = lp_release,
750#ifdef CONFIG_PARPORT_1284
751 .read = lp_read,
752#endif
753 .llseek = noop_llseek,
754};
755
756/* --- support for console on the line printer ----------------- */
757
758#ifdef CONFIG_LP_CONSOLE
759
760#define CONSOLE_LP 0
761
762/* If the printer is out of paper, we can either lose the messages or
763 * stall until the printer is happy again. Define CONSOLE_LP_STRICT
764 * non-zero to get the latter behaviour. */
765#define CONSOLE_LP_STRICT 1
766
767/* The console must be locked when we get here. */
768
769static void lp_console_write (struct console *co, const char *s,
770 unsigned count)
771{
772 struct pardevice *dev = lp_table[CONSOLE_LP].dev;
773 struct parport *port = dev->port;
774 ssize_t written;
775
776 if (parport_claim (dev))
777 /* Nothing we can do. */
778 return;
779
780 parport_set_timeout (dev, 0);
781
782 /* Go to compatibility mode. */
783 parport_negotiate (port, IEEE1284_MODE_COMPAT);
784
785 do {
786 /* Write the data, converting LF->CRLF as we go. */
787 ssize_t canwrite = count;
788 char *lf = memchr (s, '\n', count);
789 if (lf)
790 canwrite = lf - s;
791
792 if (canwrite > 0) {
793 written = parport_write (port, s, canwrite);
794
795 if (written <= 0)
796 continue;
797
798 s += written;
799 count -= written;
800 canwrite -= written;
801 }
802
803 if (lf && canwrite <= 0) {
804 const char *crlf = "\r\n";
805 int i = 2;
806
807 /* Dodge the original '\n', and put '\r\n' instead. */
808 s++;
809 count--;
810 do {
811 written = parport_write (port, crlf, i);
812 if (written > 0)
813 i -= written, crlf += written;
814 } while (i > 0 && (CONSOLE_LP_STRICT || written > 0));
815 }
816 } while (count > 0 && (CONSOLE_LP_STRICT || written > 0));
817
818 parport_release (dev);
819}
820
821static struct console lpcons = {
822 .name = "lp",
823 .write = lp_console_write,
824 .flags = CON_PRINTBUFFER,
825};
826
827#endif /* console on line printer */
828
829/* --- initialisation code ------------------------------------- */
830
831static int parport_nr[LP_NO] = { [0 ... LP_NO-1] = LP_PARPORT_UNSPEC };
832static char *parport[LP_NO];
833static bool reset;
834
835module_param_array(parport, charp, NULL, 0);
836module_param(reset, bool, 0);
837
838#ifndef MODULE
839static int __init lp_setup (char *str)
840{
841 static int parport_ptr;
842 int x;
843
844 if (get_option(&str, &x)) {
845 if (x == 0) {
846 /* disable driver on "lp=" or "lp=0" */
847 parport_nr[0] = LP_PARPORT_OFF;
848 } else {
849 printk(KERN_WARNING "warning: 'lp=0x%x' is deprecated, ignored\n", x);
850 return 0;
851 }
852 } else if (!strncmp(str, "parport", 7)) {
853 int n = simple_strtoul(str+7, NULL, 10);
854 if (parport_ptr < LP_NO)
855 parport_nr[parport_ptr++] = n;
856 else
857 printk(KERN_INFO "lp: too many ports, %s ignored.\n",
858 str);
859 } else if (!strcmp(str, "auto")) {
860 parport_nr[0] = LP_PARPORT_AUTO;
861 } else if (!strcmp(str, "none")) {
862 parport_nr[parport_ptr++] = LP_PARPORT_NONE;
863 } else if (!strcmp(str, "reset")) {
864 reset = 1;
865 }
866 return 1;
867}
868#endif
869
870static int lp_register(int nr, struct parport *port)
871{
872 lp_table[nr].dev = parport_register_device(port, "lp",
873 lp_preempt, NULL, NULL, 0,
874 (void *) &lp_table[nr]);
875 if (lp_table[nr].dev == NULL)
876 return 1;
877 lp_table[nr].flags |= LP_EXIST;
878
879 if (reset)
880 lp_reset(nr);
881
882 device_create(lp_class, port->dev, MKDEV(LP_MAJOR, nr), NULL,
883 "lp%d", nr);
884
885 printk(KERN_INFO "lp%d: using %s (%s).\n", nr, port->name,
886 (port->irq == PARPORT_IRQ_NONE)?"polling":"interrupt-driven");
887
888#ifdef CONFIG_LP_CONSOLE
889 if (!nr) {
890 if (port->modes & PARPORT_MODE_SAFEININT) {
891 register_console(&lpcons);
892 console_registered = port;
893 printk (KERN_INFO "lp%d: console ready\n", CONSOLE_LP);
894 } else
895 printk (KERN_ERR "lp%d: cannot run console on %s\n",
896 CONSOLE_LP, port->name);
897 }
898#endif
899
900 return 0;
901}
902
903static void lp_attach (struct parport *port)
904{
905 unsigned int i;
906
907 switch (parport_nr[0]) {
908 case LP_PARPORT_UNSPEC:
909 case LP_PARPORT_AUTO:
910 if (parport_nr[0] == LP_PARPORT_AUTO &&
911 port->probe_info[0].class != PARPORT_CLASS_PRINTER)
912 return;
913 if (lp_count == LP_NO) {
914 printk(KERN_INFO "lp: ignoring parallel port (max. %d)\n",LP_NO);
915 return;
916 }
917 if (!lp_register(lp_count, port))
918 lp_count++;
919 break;
920
921 default:
922 for (i = 0; i < LP_NO; i++) {
923 if (port->number == parport_nr[i]) {
924 if (!lp_register(i, port))
925 lp_count++;
926 break;
927 }
928 }
929 break;
930 }
931}
932
933static void lp_detach (struct parport *port)
934{
935 /* Write this some day. */
936#ifdef CONFIG_LP_CONSOLE
937 if (console_registered == port) {
938 unregister_console(&lpcons);
939 console_registered = NULL;
940 }
941#endif /* CONFIG_LP_CONSOLE */
942}
943
944static struct parport_driver lp_driver = {
945 .name = "lp",
946 .attach = lp_attach,
947 .detach = lp_detach,
948};
949
950static int __init lp_init (void)
951{
952 int i, err = 0;
953
954 if (parport_nr[0] == LP_PARPORT_OFF)
955 return 0;
956
957 for (i = 0; i < LP_NO; i++) {
958 lp_table[i].dev = NULL;
959 lp_table[i].flags = 0;
960 lp_table[i].chars = LP_INIT_CHAR;
961 lp_table[i].time = LP_INIT_TIME;
962 lp_table[i].wait = LP_INIT_WAIT;
963 lp_table[i].lp_buffer = NULL;
964#ifdef LP_STATS
965 lp_table[i].lastcall = 0;
966 lp_table[i].runchars = 0;
967 memset (&lp_table[i].stats, 0, sizeof (struct lp_stats));
968#endif
969 lp_table[i].last_error = 0;
970 init_waitqueue_head (&lp_table[i].waitq);
971 init_waitqueue_head (&lp_table[i].dataq);
972 mutex_init(&lp_table[i].port_mutex);
973 lp_table[i].timeout = 10 * HZ;
974 }
975
976 if (register_chrdev (LP_MAJOR, "lp", &lp_fops)) {
977 printk (KERN_ERR "lp: unable to get major %d\n", LP_MAJOR);
978 return -EIO;
979 }
980
981 lp_class = class_create(THIS_MODULE, "printer");
982 if (IS_ERR(lp_class)) {
983 err = PTR_ERR(lp_class);
984 goto out_reg;
985 }
986
987 if (parport_register_driver (&lp_driver)) {
988 printk (KERN_ERR "lp: unable to register with parport\n");
989 err = -EIO;
990 goto out_class;
991 }
992
993 if (!lp_count) {
994 printk (KERN_INFO "lp: driver loaded but no devices found\n");
995#ifndef CONFIG_PARPORT_1284
996 if (parport_nr[0] == LP_PARPORT_AUTO)
997 printk (KERN_INFO "lp: (is IEEE 1284 support enabled?)\n");
998#endif
999 }
1000
1001 return 0;
1002
1003out_class:
1004 class_destroy(lp_class);
1005out_reg:
1006 unregister_chrdev(LP_MAJOR, "lp");
1007 return err;
1008}
1009
1010static int __init lp_init_module (void)
1011{
1012 if (parport[0]) {
1013 /* The user gave some parameters. Let's see what they were. */
1014 if (!strncmp(parport[0], "auto", 4))
1015 parport_nr[0] = LP_PARPORT_AUTO;
1016 else {
1017 int n;
1018 for (n = 0; n < LP_NO && parport[n]; n++) {
1019 if (!strncmp(parport[n], "none", 4))
1020 parport_nr[n] = LP_PARPORT_NONE;
1021 else {
1022 char *ep;
1023 unsigned long r = simple_strtoul(parport[n], &ep, 0);
1024 if (ep != parport[n])
1025 parport_nr[n] = r;
1026 else {
1027 printk(KERN_ERR "lp: bad port specifier `%s'\n", parport[n]);
1028 return -ENODEV;
1029 }
1030 }
1031 }
1032 }
1033 }
1034
1035 return lp_init();
1036}
1037
1038static void lp_cleanup_module (void)
1039{
1040 unsigned int offset;
1041
1042 parport_unregister_driver (&lp_driver);
1043
1044#ifdef CONFIG_LP_CONSOLE
1045 unregister_console (&lpcons);
1046#endif
1047
1048 unregister_chrdev(LP_MAJOR, "lp");
1049 for (offset = 0; offset < LP_NO; offset++) {
1050 if (lp_table[offset].dev == NULL)
1051 continue;
1052 parport_unregister_device(lp_table[offset].dev);
1053 device_destroy(lp_class, MKDEV(LP_MAJOR, offset));
1054 }
1055 class_destroy(lp_class);
1056}
1057
1058__setup("lp=", lp_setup);
1059module_init(lp_init_module);
1060module_exit(lp_cleanup_module);
1061
1062MODULE_ALIAS_CHARDEV_MAJOR(LP_MAJOR);
1063MODULE_LICENSE("GPL");