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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#include <asm/system.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];
145
146static unsigned int lp_count = 0;
147static struct class *lp_class;
148
149#ifdef CONFIG_LP_CONSOLE
150static struct parport *console_registered;
151#endif /* CONFIG_LP_CONSOLE */
152
153#undef LP_DEBUG
154
155/* Bits used to manage claiming the parport device */
156#define LP_PREEMPT_REQUEST 1
157#define LP_PARPORT_CLAIMED 2
158
159/* --- low-level port access ----------------------------------- */
160
161#define r_dtr(x) (parport_read_data(lp_table[(x)].dev->port))
162#define r_str(x) (parport_read_status(lp_table[(x)].dev->port))
163#define w_ctr(x,y) do { parport_write_control(lp_table[(x)].dev->port, (y)); } while (0)
164#define w_dtr(x,y) do { parport_write_data(lp_table[(x)].dev->port, (y)); } while (0)
165
166/* Claim the parport or block trying unless we've already claimed it */
167static void lp_claim_parport_or_block(struct lp_struct *this_lp)
168{
169 if (!test_and_set_bit(LP_PARPORT_CLAIMED, &this_lp->bits)) {
170 parport_claim_or_block (this_lp->dev);
171 }
172}
173
174/* Claim the parport or block trying unless we've already claimed it */
175static void lp_release_parport(struct lp_struct *this_lp)
176{
177 if (test_and_clear_bit(LP_PARPORT_CLAIMED, &this_lp->bits)) {
178 parport_release (this_lp->dev);
179 }
180}
181
182
183
184static int lp_preempt(void *handle)
185{
186 struct lp_struct *this_lp = (struct lp_struct *)handle;
187 set_bit(LP_PREEMPT_REQUEST, &this_lp->bits);
188 return (1);
189}
190
191
192/*
193 * Try to negotiate to a new mode; if unsuccessful negotiate to
194 * compatibility mode. Return the mode we ended up in.
195 */
196static int lp_negotiate(struct parport * port, int mode)
197{
198 if (parport_negotiate (port, mode) != 0) {
199 mode = IEEE1284_MODE_COMPAT;
200 parport_negotiate (port, mode);
201 }
202
203 return (mode);
204}
205
206static int lp_reset(int minor)
207{
208 int retval;
209 lp_claim_parport_or_block (&lp_table[minor]);
210 w_ctr(minor, LP_PSELECP);
211 udelay (LP_DELAY);
212 w_ctr(minor, LP_PSELECP | LP_PINITP);
213 retval = r_str(minor);
214 lp_release_parport (&lp_table[minor]);
215 return retval;
216}
217
218static void lp_error (int minor)
219{
220 DEFINE_WAIT(wait);
221 int polling;
222
223 if (LP_F(minor) & LP_ABORT)
224 return;
225
226 polling = lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE;
227 if (polling) lp_release_parport (&lp_table[minor]);
228 prepare_to_wait(&lp_table[minor].waitq, &wait, TASK_INTERRUPTIBLE);
229 schedule_timeout(LP_TIMEOUT_POLLED);
230 finish_wait(&lp_table[minor].waitq, &wait);
231 if (polling) lp_claim_parport_or_block (&lp_table[minor]);
232 else parport_yield_blocking (lp_table[minor].dev);
233}
234
235static int lp_check_status(int minor)
236{
237 int error = 0;
238 unsigned int last = lp_table[minor].last_error;
239 unsigned char status = r_str(minor);
240 if ((status & LP_PERRORP) && !(LP_F(minor) & LP_CAREFUL))
241 /* No error. */
242 last = 0;
243 else if ((status & LP_POUTPA)) {
244 if (last != LP_POUTPA) {
245 last = LP_POUTPA;
246 printk(KERN_INFO "lp%d out of paper\n", minor);
247 }
248 error = -ENOSPC;
249 } else if (!(status & LP_PSELECD)) {
250 if (last != LP_PSELECD) {
251 last = LP_PSELECD;
252 printk(KERN_INFO "lp%d off-line\n", minor);
253 }
254 error = -EIO;
255 } else if (!(status & LP_PERRORP)) {
256 if (last != LP_PERRORP) {
257 last = LP_PERRORP;
258 printk(KERN_INFO "lp%d on fire\n", minor);
259 }
260 error = -EIO;
261 } else {
262 last = 0; /* Come here if LP_CAREFUL is set and no
263 errors are reported. */
264 }
265
266 lp_table[minor].last_error = last;
267
268 if (last != 0)
269 lp_error(minor);
270
271 return error;
272}
273
274static int lp_wait_ready(int minor, int nonblock)
275{
276 int error = 0;
277
278 /* If we're not in compatibility mode, we're ready now! */
279 if (lp_table[minor].current_mode != IEEE1284_MODE_COMPAT) {
280 return (0);
281 }
282
283 do {
284 error = lp_check_status (minor);
285 if (error && (nonblock || (LP_F(minor) & LP_ABORT)))
286 break;
287 if (signal_pending (current)) {
288 error = -EINTR;
289 break;
290 }
291 } while (error);
292 return error;
293}
294
295static ssize_t lp_write(struct file * file, const char __user * buf,
296 size_t count, loff_t *ppos)
297{
298 unsigned int minor = iminor(file->f_path.dentry->d_inode);
299 struct parport *port = lp_table[minor].dev->port;
300 char *kbuf = lp_table[minor].lp_buffer;
301 ssize_t retv = 0;
302 ssize_t written;
303 size_t copy_size = count;
304 int nonblock = ((file->f_flags & O_NONBLOCK) ||
305 (LP_F(minor) & LP_ABORT));
306
307#ifdef LP_STATS
308 if (time_after(jiffies, lp_table[minor].lastcall + LP_TIME(minor)))
309 lp_table[minor].runchars = 0;
310
311 lp_table[minor].lastcall = jiffies;
312#endif
313
314 /* Need to copy the data from user-space. */
315 if (copy_size > LP_BUFFER_SIZE)
316 copy_size = LP_BUFFER_SIZE;
317
318 if (mutex_lock_interruptible(&lp_table[minor].port_mutex))
319 return -EINTR;
320
321 if (copy_from_user (kbuf, buf, copy_size)) {
322 retv = -EFAULT;
323 goto out_unlock;
324 }
325
326 /* Claim Parport or sleep until it becomes available
327 */
328 lp_claim_parport_or_block (&lp_table[minor]);
329 /* Go to the proper mode. */
330 lp_table[minor].current_mode = lp_negotiate (port,
331 lp_table[minor].best_mode);
332
333 parport_set_timeout (lp_table[minor].dev,
334 (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK
335 : lp_table[minor].timeout));
336
337 if ((retv = lp_wait_ready (minor, nonblock)) == 0)
338 do {
339 /* Write the data. */
340 written = parport_write (port, kbuf, copy_size);
341 if (written > 0) {
342 copy_size -= written;
343 count -= written;
344 buf += written;
345 retv += written;
346 }
347
348 if (signal_pending (current)) {
349 if (retv == 0)
350 retv = -EINTR;
351
352 break;
353 }
354
355 if (copy_size > 0) {
356 /* incomplete write -> check error ! */
357 int error;
358
359 parport_negotiate (lp_table[minor].dev->port,
360 IEEE1284_MODE_COMPAT);
361 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
362
363 error = lp_wait_ready (minor, nonblock);
364
365 if (error) {
366 if (retv == 0)
367 retv = error;
368 break;
369 } else if (nonblock) {
370 if (retv == 0)
371 retv = -EAGAIN;
372 break;
373 }
374
375 parport_yield_blocking (lp_table[minor].dev);
376 lp_table[minor].current_mode
377 = lp_negotiate (port,
378 lp_table[minor].best_mode);
379
380 } else if (need_resched())
381 schedule ();
382
383 if (count) {
384 copy_size = count;
385 if (copy_size > LP_BUFFER_SIZE)
386 copy_size = LP_BUFFER_SIZE;
387
388 if (copy_from_user(kbuf, buf, copy_size)) {
389 if (retv == 0)
390 retv = -EFAULT;
391 break;
392 }
393 }
394 } while (count > 0);
395
396 if (test_and_clear_bit(LP_PREEMPT_REQUEST,
397 &lp_table[minor].bits)) {
398 printk(KERN_INFO "lp%d releasing parport\n", minor);
399 parport_negotiate (lp_table[minor].dev->port,
400 IEEE1284_MODE_COMPAT);
401 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
402 lp_release_parport (&lp_table[minor]);
403 }
404out_unlock:
405 mutex_unlock(&lp_table[minor].port_mutex);
406
407 return retv;
408}
409
410#ifdef CONFIG_PARPORT_1284
411
412/* Status readback conforming to ieee1284 */
413static ssize_t lp_read(struct file * file, char __user * buf,
414 size_t count, loff_t *ppos)
415{
416 DEFINE_WAIT(wait);
417 unsigned int minor=iminor(file->f_path.dentry->d_inode);
418 struct parport *port = lp_table[minor].dev->port;
419 ssize_t retval = 0;
420 char *kbuf = lp_table[minor].lp_buffer;
421 int nonblock = ((file->f_flags & O_NONBLOCK) ||
422 (LP_F(minor) & LP_ABORT));
423
424 if (count > LP_BUFFER_SIZE)
425 count = LP_BUFFER_SIZE;
426
427 if (mutex_lock_interruptible(&lp_table[minor].port_mutex))
428 return -EINTR;
429
430 lp_claim_parport_or_block (&lp_table[minor]);
431
432 parport_set_timeout (lp_table[minor].dev,
433 (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK
434 : lp_table[minor].timeout));
435
436 parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
437 if (parport_negotiate (lp_table[minor].dev->port,
438 IEEE1284_MODE_NIBBLE)) {
439 retval = -EIO;
440 goto out;
441 }
442
443 while (retval == 0) {
444 retval = parport_read (port, kbuf, count);
445
446 if (retval > 0)
447 break;
448
449 if (nonblock) {
450 retval = -EAGAIN;
451 break;
452 }
453
454 /* Wait for data. */
455
456 if (lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE) {
457 parport_negotiate (lp_table[minor].dev->port,
458 IEEE1284_MODE_COMPAT);
459 lp_error (minor);
460 if (parport_negotiate (lp_table[minor].dev->port,
461 IEEE1284_MODE_NIBBLE)) {
462 retval = -EIO;
463 goto out;
464 }
465 } else {
466 prepare_to_wait(&lp_table[minor].waitq, &wait, TASK_INTERRUPTIBLE);
467 schedule_timeout(LP_TIMEOUT_POLLED);
468 finish_wait(&lp_table[minor].waitq, &wait);
469 }
470
471 if (signal_pending (current)) {
472 retval = -ERESTARTSYS;
473 break;
474 }
475
476 cond_resched ();
477 }
478 parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
479 out:
480 lp_release_parport (&lp_table[minor]);
481
482 if (retval > 0 && copy_to_user (buf, kbuf, retval))
483 retval = -EFAULT;
484
485 mutex_unlock(&lp_table[minor].port_mutex);
486
487 return retval;
488}
489
490#endif /* IEEE 1284 support */
491
492static int lp_open(struct inode * inode, struct file * file)
493{
494 unsigned int minor = iminor(inode);
495 int ret = 0;
496
497 mutex_lock(&lp_mutex);
498 if (minor >= LP_NO) {
499 ret = -ENXIO;
500 goto out;
501 }
502 if ((LP_F(minor) & LP_EXIST) == 0) {
503 ret = -ENXIO;
504 goto out;
505 }
506 if (test_and_set_bit(LP_BUSY_BIT_POS, &LP_F(minor))) {
507 ret = -EBUSY;
508 goto out;
509 }
510 /* If ABORTOPEN is set and the printer is offline or out of paper,
511 we may still want to open it to perform ioctl()s. Therefore we
512 have commandeered O_NONBLOCK, even though it is being used in
513 a non-standard manner. This is strictly a Linux hack, and
514 should most likely only ever be used by the tunelp application. */
515 if ((LP_F(minor) & LP_ABORTOPEN) && !(file->f_flags & O_NONBLOCK)) {
516 int status;
517 lp_claim_parport_or_block (&lp_table[minor]);
518 status = r_str(minor);
519 lp_release_parport (&lp_table[minor]);
520 if (status & LP_POUTPA) {
521 printk(KERN_INFO "lp%d out of paper\n", minor);
522 LP_F(minor) &= ~LP_BUSY;
523 ret = -ENOSPC;
524 goto out;
525 } else if (!(status & LP_PSELECD)) {
526 printk(KERN_INFO "lp%d off-line\n", minor);
527 LP_F(minor) &= ~LP_BUSY;
528 ret = -EIO;
529 goto out;
530 } else if (!(status & LP_PERRORP)) {
531 printk(KERN_ERR "lp%d printer error\n", minor);
532 LP_F(minor) &= ~LP_BUSY;
533 ret = -EIO;
534 goto out;
535 }
536 }
537 lp_table[minor].lp_buffer = kmalloc(LP_BUFFER_SIZE, GFP_KERNEL);
538 if (!lp_table[minor].lp_buffer) {
539 LP_F(minor) &= ~LP_BUSY;
540 ret = -ENOMEM;
541 goto out;
542 }
543 /* Determine if the peripheral supports ECP mode */
544 lp_claim_parport_or_block (&lp_table[minor]);
545 if ( (lp_table[minor].dev->port->modes & PARPORT_MODE_ECP) &&
546 !parport_negotiate (lp_table[minor].dev->port,
547 IEEE1284_MODE_ECP)) {
548 printk (KERN_INFO "lp%d: ECP mode\n", minor);
549 lp_table[minor].best_mode = IEEE1284_MODE_ECP;
550 } else {
551 lp_table[minor].best_mode = IEEE1284_MODE_COMPAT;
552 }
553 /* Leave peripheral in compatibility mode */
554 parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
555 lp_release_parport (&lp_table[minor]);
556 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
557out:
558 mutex_unlock(&lp_mutex);
559 return ret;
560}
561
562static int lp_release(struct inode * inode, struct file * file)
563{
564 unsigned int minor = iminor(inode);
565
566 lp_claim_parport_or_block (&lp_table[minor]);
567 parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
568 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
569 lp_release_parport (&lp_table[minor]);
570 kfree(lp_table[minor].lp_buffer);
571 lp_table[minor].lp_buffer = NULL;
572 LP_F(minor) &= ~LP_BUSY;
573 return 0;
574}
575
576static int lp_do_ioctl(unsigned int minor, unsigned int cmd,
577 unsigned long arg, void __user *argp)
578{
579 int status;
580 int retval = 0;
581
582#ifdef LP_DEBUG
583 printk(KERN_DEBUG "lp%d ioctl, cmd: 0x%x, arg: 0x%lx\n", minor, cmd, arg);
584#endif
585 if (minor >= LP_NO)
586 return -ENODEV;
587 if ((LP_F(minor) & LP_EXIST) == 0)
588 return -ENODEV;
589 switch ( cmd ) {
590 case LPTIME:
591 LP_TIME(minor) = arg * HZ/100;
592 break;
593 case LPCHAR:
594 LP_CHAR(minor) = arg;
595 break;
596 case LPABORT:
597 if (arg)
598 LP_F(minor) |= LP_ABORT;
599 else
600 LP_F(minor) &= ~LP_ABORT;
601 break;
602 case LPABORTOPEN:
603 if (arg)
604 LP_F(minor) |= LP_ABORTOPEN;
605 else
606 LP_F(minor) &= ~LP_ABORTOPEN;
607 break;
608 case LPCAREFUL:
609 if (arg)
610 LP_F(minor) |= LP_CAREFUL;
611 else
612 LP_F(minor) &= ~LP_CAREFUL;
613 break;
614 case LPWAIT:
615 LP_WAIT(minor) = arg;
616 break;
617 case LPSETIRQ:
618 return -EINVAL;
619 break;
620 case LPGETIRQ:
621 if (copy_to_user(argp, &LP_IRQ(minor),
622 sizeof(int)))
623 return -EFAULT;
624 break;
625 case LPGETSTATUS:
626 lp_claim_parport_or_block (&lp_table[minor]);
627 status = r_str(minor);
628 lp_release_parport (&lp_table[minor]);
629
630 if (copy_to_user(argp, &status, sizeof(int)))
631 return -EFAULT;
632 break;
633 case LPRESET:
634 lp_reset(minor);
635 break;
636#ifdef LP_STATS
637 case LPGETSTATS:
638 if (copy_to_user(argp, &LP_STAT(minor),
639 sizeof(struct lp_stats)))
640 return -EFAULT;
641 if (capable(CAP_SYS_ADMIN))
642 memset(&LP_STAT(minor), 0,
643 sizeof(struct lp_stats));
644 break;
645#endif
646 case LPGETFLAGS:
647 status = LP_F(minor);
648 if (copy_to_user(argp, &status, sizeof(int)))
649 return -EFAULT;
650 break;
651
652 default:
653 retval = -EINVAL;
654 }
655 return retval;
656}
657
658static int lp_set_timeout(unsigned int minor, struct timeval *par_timeout)
659{
660 long to_jiffies;
661
662 /* Convert to jiffies, place in lp_table */
663 if ((par_timeout->tv_sec < 0) ||
664 (par_timeout->tv_usec < 0)) {
665 return -EINVAL;
666 }
667 to_jiffies = DIV_ROUND_UP(par_timeout->tv_usec, 1000000/HZ);
668 to_jiffies += par_timeout->tv_sec * (long) HZ;
669 if (to_jiffies <= 0) {
670 return -EINVAL;
671 }
672 lp_table[minor].timeout = to_jiffies;
673 return 0;
674}
675
676static long lp_ioctl(struct file *file, unsigned int cmd,
677 unsigned long arg)
678{
679 unsigned int minor;
680 struct timeval par_timeout;
681 int ret;
682
683 minor = iminor(file->f_path.dentry->d_inode);
684 mutex_lock(&lp_mutex);
685 switch (cmd) {
686 case LPSETTIMEOUT:
687 if (copy_from_user(&par_timeout, (void __user *)arg,
688 sizeof (struct timeval))) {
689 ret = -EFAULT;
690 break;
691 }
692 ret = lp_set_timeout(minor, &par_timeout);
693 break;
694 default:
695 ret = lp_do_ioctl(minor, cmd, arg, (void __user *)arg);
696 break;
697 }
698 mutex_unlock(&lp_mutex);
699
700 return ret;
701}
702
703#ifdef CONFIG_COMPAT
704static long lp_compat_ioctl(struct file *file, unsigned int cmd,
705 unsigned long arg)
706{
707 unsigned int minor;
708 struct timeval par_timeout;
709 struct compat_timeval __user *tc;
710 int ret;
711
712 minor = iminor(file->f_path.dentry->d_inode);
713 mutex_lock(&lp_mutex);
714 switch (cmd) {
715 case LPSETTIMEOUT:
716 tc = compat_ptr(arg);
717 if (get_user(par_timeout.tv_sec, &tc->tv_sec) ||
718 get_user(par_timeout.tv_usec, &tc->tv_usec)) {
719 ret = -EFAULT;
720 break;
721 }
722 ret = lp_set_timeout(minor, &par_timeout);
723 break;
724#ifdef LP_STATS
725 case LPGETSTATS:
726 /* FIXME: add an implementation if you set LP_STATS */
727 ret = -EINVAL;
728 break;
729#endif
730 default:
731 ret = lp_do_ioctl(minor, cmd, arg, compat_ptr(arg));
732 break;
733 }
734 mutex_unlock(&lp_mutex);
735
736 return ret;
737}
738#endif
739
740static const struct file_operations lp_fops = {
741 .owner = THIS_MODULE,
742 .write = lp_write,
743 .unlocked_ioctl = lp_ioctl,
744#ifdef CONFIG_COMPAT
745 .compat_ioctl = lp_compat_ioctl,
746#endif
747 .open = lp_open,
748 .release = lp_release,
749#ifdef CONFIG_PARPORT_1284
750 .read = lp_read,
751#endif
752 .llseek = noop_llseek,
753};
754
755/* --- support for console on the line printer ----------------- */
756
757#ifdef CONFIG_LP_CONSOLE
758
759#define CONSOLE_LP 0
760
761/* If the printer is out of paper, we can either lose the messages or
762 * stall until the printer is happy again. Define CONSOLE_LP_STRICT
763 * non-zero to get the latter behaviour. */
764#define CONSOLE_LP_STRICT 1
765
766/* The console must be locked when we get here. */
767
768static void lp_console_write (struct console *co, const char *s,
769 unsigned count)
770{
771 struct pardevice *dev = lp_table[CONSOLE_LP].dev;
772 struct parport *port = dev->port;
773 ssize_t written;
774
775 if (parport_claim (dev))
776 /* Nothing we can do. */
777 return;
778
779 parport_set_timeout (dev, 0);
780
781 /* Go to compatibility mode. */
782 parport_negotiate (port, IEEE1284_MODE_COMPAT);
783
784 do {
785 /* Write the data, converting LF->CRLF as we go. */
786 ssize_t canwrite = count;
787 char *lf = memchr (s, '\n', count);
788 if (lf)
789 canwrite = lf - s;
790
791 if (canwrite > 0) {
792 written = parport_write (port, s, canwrite);
793
794 if (written <= 0)
795 continue;
796
797 s += written;
798 count -= written;
799 canwrite -= written;
800 }
801
802 if (lf && canwrite <= 0) {
803 const char *crlf = "\r\n";
804 int i = 2;
805
806 /* Dodge the original '\n', and put '\r\n' instead. */
807 s++;
808 count--;
809 do {
810 written = parport_write (port, crlf, i);
811 if (written > 0)
812 i -= written, crlf += written;
813 } while (i > 0 && (CONSOLE_LP_STRICT || written > 0));
814 }
815 } while (count > 0 && (CONSOLE_LP_STRICT || written > 0));
816
817 parport_release (dev);
818}
819
820static struct console lpcons = {
821 .name = "lp",
822 .write = lp_console_write,
823 .flags = CON_PRINTBUFFER,
824};
825
826#endif /* console on line printer */
827
828/* --- initialisation code ------------------------------------- */
829
830static int parport_nr[LP_NO] = { [0 ... LP_NO-1] = LP_PARPORT_UNSPEC };
831static char *parport[LP_NO];
832static int reset;
833
834module_param_array(parport, charp, NULL, 0);
835module_param(reset, bool, 0);
836
837#ifndef MODULE
838static int __init lp_setup (char *str)
839{
840 static int parport_ptr;
841 int x;
842
843 if (get_option(&str, &x)) {
844 if (x == 0) {
845 /* disable driver on "lp=" or "lp=0" */
846 parport_nr[0] = LP_PARPORT_OFF;
847 } else {
848 printk(KERN_WARNING "warning: 'lp=0x%x' is deprecated, ignored\n", x);
849 return 0;
850 }
851 } else if (!strncmp(str, "parport", 7)) {
852 int n = simple_strtoul(str+7, NULL, 10);
853 if (parport_ptr < LP_NO)
854 parport_nr[parport_ptr++] = n;
855 else
856 printk(KERN_INFO "lp: too many ports, %s ignored.\n",
857 str);
858 } else if (!strcmp(str, "auto")) {
859 parport_nr[0] = LP_PARPORT_AUTO;
860 } else if (!strcmp(str, "none")) {
861 parport_nr[parport_ptr++] = LP_PARPORT_NONE;
862 } else if (!strcmp(str, "reset")) {
863 reset = 1;
864 }
865 return 1;
866}
867#endif
868
869static int lp_register(int nr, struct parport *port)
870{
871 lp_table[nr].dev = parport_register_device(port, "lp",
872 lp_preempt, NULL, NULL, 0,
873 (void *) &lp_table[nr]);
874 if (lp_table[nr].dev == NULL)
875 return 1;
876 lp_table[nr].flags |= LP_EXIST;
877
878 if (reset)
879 lp_reset(nr);
880
881 device_create(lp_class, port->dev, MKDEV(LP_MAJOR, nr), NULL,
882 "lp%d", nr);
883
884 printk(KERN_INFO "lp%d: using %s (%s).\n", nr, port->name,
885 (port->irq == PARPORT_IRQ_NONE)?"polling":"interrupt-driven");
886
887#ifdef CONFIG_LP_CONSOLE
888 if (!nr) {
889 if (port->modes & PARPORT_MODE_SAFEININT) {
890 register_console(&lpcons);
891 console_registered = port;
892 printk (KERN_INFO "lp%d: console ready\n", CONSOLE_LP);
893 } else
894 printk (KERN_ERR "lp%d: cannot run console on %s\n",
895 CONSOLE_LP, port->name);
896 }
897#endif
898
899 return 0;
900}
901
902static void lp_attach (struct parport *port)
903{
904 unsigned int i;
905
906 switch (parport_nr[0]) {
907 case LP_PARPORT_UNSPEC:
908 case LP_PARPORT_AUTO:
909 if (parport_nr[0] == LP_PARPORT_AUTO &&
910 port->probe_info[0].class != PARPORT_CLASS_PRINTER)
911 return;
912 if (lp_count == LP_NO) {
913 printk(KERN_INFO "lp: ignoring parallel port (max. %d)\n",LP_NO);
914 return;
915 }
916 if (!lp_register(lp_count, port))
917 lp_count++;
918 break;
919
920 default:
921 for (i = 0; i < LP_NO; i++) {
922 if (port->number == parport_nr[i]) {
923 if (!lp_register(i, port))
924 lp_count++;
925 break;
926 }
927 }
928 break;
929 }
930}
931
932static void lp_detach (struct parport *port)
933{
934 /* Write this some day. */
935#ifdef CONFIG_LP_CONSOLE
936 if (console_registered == port) {
937 unregister_console(&lpcons);
938 console_registered = NULL;
939 }
940#endif /* CONFIG_LP_CONSOLE */
941}
942
943static struct parport_driver lp_driver = {
944 .name = "lp",
945 .attach = lp_attach,
946 .detach = lp_detach,
947};
948
949static int __init lp_init (void)
950{
951 int i, err = 0;
952
953 if (parport_nr[0] == LP_PARPORT_OFF)
954 return 0;
955
956 for (i = 0; i < LP_NO; i++) {
957 lp_table[i].dev = NULL;
958 lp_table[i].flags = 0;
959 lp_table[i].chars = LP_INIT_CHAR;
960 lp_table[i].time = LP_INIT_TIME;
961 lp_table[i].wait = LP_INIT_WAIT;
962 lp_table[i].lp_buffer = NULL;
963#ifdef LP_STATS
964 lp_table[i].lastcall = 0;
965 lp_table[i].runchars = 0;
966 memset (&lp_table[i].stats, 0, sizeof (struct lp_stats));
967#endif
968 lp_table[i].last_error = 0;
969 init_waitqueue_head (&lp_table[i].waitq);
970 init_waitqueue_head (&lp_table[i].dataq);
971 mutex_init(&lp_table[i].port_mutex);
972 lp_table[i].timeout = 10 * HZ;
973 }
974
975 if (register_chrdev (LP_MAJOR, "lp", &lp_fops)) {
976 printk (KERN_ERR "lp: unable to get major %d\n", LP_MAJOR);
977 return -EIO;
978 }
979
980 lp_class = class_create(THIS_MODULE, "printer");
981 if (IS_ERR(lp_class)) {
982 err = PTR_ERR(lp_class);
983 goto out_reg;
984 }
985
986 if (parport_register_driver (&lp_driver)) {
987 printk (KERN_ERR "lp: unable to register with parport\n");
988 err = -EIO;
989 goto out_class;
990 }
991
992 if (!lp_count) {
993 printk (KERN_INFO "lp: driver loaded but no devices found\n");
994#ifndef CONFIG_PARPORT_1284
995 if (parport_nr[0] == LP_PARPORT_AUTO)
996 printk (KERN_INFO "lp: (is IEEE 1284 support enabled?)\n");
997#endif
998 }
999
1000 return 0;
1001
1002out_class:
1003 class_destroy(lp_class);
1004out_reg:
1005 unregister_chrdev(LP_MAJOR, "lp");
1006 return err;
1007}
1008
1009static int __init lp_init_module (void)
1010{
1011 if (parport[0]) {
1012 /* The user gave some parameters. Let's see what they were. */
1013 if (!strncmp(parport[0], "auto", 4))
1014 parport_nr[0] = LP_PARPORT_AUTO;
1015 else {
1016 int n;
1017 for (n = 0; n < LP_NO && parport[n]; n++) {
1018 if (!strncmp(parport[n], "none", 4))
1019 parport_nr[n] = LP_PARPORT_NONE;
1020 else {
1021 char *ep;
1022 unsigned long r = simple_strtoul(parport[n], &ep, 0);
1023 if (ep != parport[n])
1024 parport_nr[n] = r;
1025 else {
1026 printk(KERN_ERR "lp: bad port specifier `%s'\n", parport[n]);
1027 return -ENODEV;
1028 }
1029 }
1030 }
1031 }
1032 }
1033
1034 return lp_init();
1035}
1036
1037static void lp_cleanup_module (void)
1038{
1039 unsigned int offset;
1040
1041 parport_unregister_driver (&lp_driver);
1042
1043#ifdef CONFIG_LP_CONSOLE
1044 unregister_console (&lpcons);
1045#endif
1046
1047 unregister_chrdev(LP_MAJOR, "lp");
1048 for (offset = 0; offset < LP_NO; offset++) {
1049 if (lp_table[offset].dev == NULL)
1050 continue;
1051 parport_unregister_device(lp_table[offset].dev);
1052 device_destroy(lp_class, MKDEV(LP_MAJOR, offset));
1053 }
1054 class_destroy(lp_class);
1055}
1056
1057__setup("lp=", lp_setup);
1058module_init(lp_init_module);
1059module_exit(lp_cleanup_module);
1060
1061MODULE_ALIAS_CHARDEV_MAJOR(LP_MAJOR);
1062MODULE_LICENSE("GPL");
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 const struct class lp_class = {
149 .name = "printer",
150};
151
152#ifdef CONFIG_LP_CONSOLE
153static struct parport *console_registered;
154#endif /* CONFIG_LP_CONSOLE */
155
156#undef LP_DEBUG
157
158/* Bits used to manage claiming the parport device */
159#define LP_PREEMPT_REQUEST 1
160#define LP_PARPORT_CLAIMED 2
161
162/* --- low-level port access ----------------------------------- */
163
164#define r_dtr(x) (parport_read_data(lp_table[(x)].dev->port))
165#define r_str(x) (parport_read_status(lp_table[(x)].dev->port))
166#define w_ctr(x,y) do { parport_write_control(lp_table[(x)].dev->port, (y)); } while (0)
167#define w_dtr(x,y) do { parport_write_data(lp_table[(x)].dev->port, (y)); } while (0)
168
169/* Claim the parport or block trying unless we've already claimed it */
170static void lp_claim_parport_or_block(struct lp_struct *this_lp)
171{
172 if (!test_and_set_bit(LP_PARPORT_CLAIMED, &this_lp->bits)) {
173 parport_claim_or_block(this_lp->dev);
174 }
175}
176
177/* Claim the parport or block trying unless we've already claimed it */
178static void lp_release_parport(struct lp_struct *this_lp)
179{
180 if (test_and_clear_bit(LP_PARPORT_CLAIMED, &this_lp->bits)) {
181 parport_release(this_lp->dev);
182 }
183}
184
185
186
187static int lp_preempt(void *handle)
188{
189 struct lp_struct *this_lp = (struct lp_struct *)handle;
190 set_bit(LP_PREEMPT_REQUEST, &this_lp->bits);
191 return 1;
192}
193
194
195/*
196 * Try to negotiate to a new mode; if unsuccessful negotiate to
197 * compatibility mode. Return the mode we ended up in.
198 */
199static int lp_negotiate(struct parport *port, int mode)
200{
201 if (parport_negotiate(port, mode) != 0) {
202 mode = IEEE1284_MODE_COMPAT;
203 parport_negotiate(port, mode);
204 }
205
206 return mode;
207}
208
209static int lp_reset(int minor)
210{
211 int retval;
212 lp_claim_parport_or_block(&lp_table[minor]);
213 w_ctr(minor, LP_PSELECP);
214 udelay(LP_DELAY);
215 w_ctr(minor, LP_PSELECP | LP_PINITP);
216 retval = r_str(minor);
217 lp_release_parport(&lp_table[minor]);
218 return retval;
219}
220
221static void lp_error(int minor)
222{
223 DEFINE_WAIT(wait);
224 int polling;
225
226 if (LP_F(minor) & LP_ABORT)
227 return;
228
229 polling = lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE;
230 if (polling)
231 lp_release_parport(&lp_table[minor]);
232 prepare_to_wait(&lp_table[minor].waitq, &wait, TASK_INTERRUPTIBLE);
233 schedule_timeout(LP_TIMEOUT_POLLED);
234 finish_wait(&lp_table[minor].waitq, &wait);
235 if (polling)
236 lp_claim_parport_or_block(&lp_table[minor]);
237 else
238 parport_yield_blocking(lp_table[minor].dev);
239}
240
241static int lp_check_status(int minor)
242{
243 int error = 0;
244 unsigned int last = lp_table[minor].last_error;
245 unsigned char status = r_str(minor);
246 if ((status & LP_PERRORP) && !(LP_F(minor) & LP_CAREFUL))
247 /* No error. */
248 last = 0;
249 else if ((status & LP_POUTPA)) {
250 if (last != LP_POUTPA) {
251 last = LP_POUTPA;
252 printk(KERN_INFO "lp%d out of paper\n", minor);
253 }
254 error = -ENOSPC;
255 } else if (!(status & LP_PSELECD)) {
256 if (last != LP_PSELECD) {
257 last = LP_PSELECD;
258 printk(KERN_INFO "lp%d off-line\n", minor);
259 }
260 error = -EIO;
261 } else if (!(status & LP_PERRORP)) {
262 if (last != LP_PERRORP) {
263 last = LP_PERRORP;
264 printk(KERN_INFO "lp%d on fire\n", minor);
265 }
266 error = -EIO;
267 } else {
268 last = 0; /* Come here if LP_CAREFUL is set and no
269 errors are reported. */
270 }
271
272 lp_table[minor].last_error = last;
273
274 if (last != 0)
275 lp_error(minor);
276
277 return error;
278}
279
280static int lp_wait_ready(int minor, int nonblock)
281{
282 int error = 0;
283
284 /* If we're not in compatibility mode, we're ready now! */
285 if (lp_table[minor].current_mode != IEEE1284_MODE_COMPAT) {
286 return 0;
287 }
288
289 do {
290 error = lp_check_status(minor);
291 if (error && (nonblock || (LP_F(minor) & LP_ABORT)))
292 break;
293 if (signal_pending(current)) {
294 error = -EINTR;
295 break;
296 }
297 } while (error);
298 return error;
299}
300
301static ssize_t lp_write(struct file *file, const char __user *buf,
302 size_t count, loff_t *ppos)
303{
304 unsigned int minor = iminor(file_inode(file));
305 struct parport *port = lp_table[minor].dev->port;
306 char *kbuf = lp_table[minor].lp_buffer;
307 ssize_t retv = 0;
308 ssize_t written;
309 size_t copy_size = count;
310 int nonblock = ((file->f_flags & O_NONBLOCK) ||
311 (LP_F(minor) & LP_ABORT));
312
313#ifdef LP_STATS
314 if (time_after(jiffies, lp_table[minor].lastcall + LP_TIME(minor)))
315 lp_table[minor].runchars = 0;
316
317 lp_table[minor].lastcall = jiffies;
318#endif
319
320 /* Need to copy the data from user-space. */
321 if (copy_size > LP_BUFFER_SIZE)
322 copy_size = LP_BUFFER_SIZE;
323
324 if (mutex_lock_interruptible(&lp_table[minor].port_mutex))
325 return -EINTR;
326
327 if (copy_from_user(kbuf, buf, copy_size)) {
328 retv = -EFAULT;
329 goto out_unlock;
330 }
331
332 /* Claim Parport or sleep until it becomes available
333 */
334 lp_claim_parport_or_block(&lp_table[minor]);
335 /* Go to the proper mode. */
336 lp_table[minor].current_mode = lp_negotiate(port,
337 lp_table[minor].best_mode);
338
339 parport_set_timeout(lp_table[minor].dev,
340 (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK
341 : lp_table[minor].timeout));
342
343 if ((retv = lp_wait_ready(minor, nonblock)) == 0)
344 do {
345 /* Write the data. */
346 written = parport_write(port, kbuf, copy_size);
347 if (written > 0) {
348 copy_size -= written;
349 count -= written;
350 buf += written;
351 retv += written;
352 }
353
354 if (signal_pending(current)) {
355 if (retv == 0)
356 retv = -EINTR;
357
358 break;
359 }
360
361 if (copy_size > 0) {
362 /* incomplete write -> check error ! */
363 int error;
364
365 parport_negotiate(lp_table[minor].dev->port,
366 IEEE1284_MODE_COMPAT);
367 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
368
369 error = lp_wait_ready(minor, nonblock);
370
371 if (error) {
372 if (retv == 0)
373 retv = error;
374 break;
375 } else if (nonblock) {
376 if (retv == 0)
377 retv = -EAGAIN;
378 break;
379 }
380
381 parport_yield_blocking(lp_table[minor].dev);
382 lp_table[minor].current_mode
383 = lp_negotiate(port,
384 lp_table[minor].best_mode);
385
386 } else if (need_resched())
387 schedule();
388
389 if (count) {
390 copy_size = count;
391 if (copy_size > LP_BUFFER_SIZE)
392 copy_size = LP_BUFFER_SIZE;
393
394 if (copy_from_user(kbuf, buf, copy_size)) {
395 if (retv == 0)
396 retv = -EFAULT;
397 break;
398 }
399 }
400 } while (count > 0);
401
402 if (test_and_clear_bit(LP_PREEMPT_REQUEST,
403 &lp_table[minor].bits)) {
404 printk(KERN_INFO "lp%d releasing parport\n", minor);
405 parport_negotiate(lp_table[minor].dev->port,
406 IEEE1284_MODE_COMPAT);
407 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
408 lp_release_parport(&lp_table[minor]);
409 }
410out_unlock:
411 mutex_unlock(&lp_table[minor].port_mutex);
412
413 return retv;
414}
415
416#ifdef CONFIG_PARPORT_1284
417
418/* Status readback conforming to ieee1284 */
419static ssize_t lp_read(struct file *file, char __user *buf,
420 size_t count, loff_t *ppos)
421{
422 DEFINE_WAIT(wait);
423 unsigned int minor=iminor(file_inode(file));
424 struct parport *port = lp_table[minor].dev->port;
425 ssize_t retval = 0;
426 char *kbuf = lp_table[minor].lp_buffer;
427 int nonblock = ((file->f_flags & O_NONBLOCK) ||
428 (LP_F(minor) & LP_ABORT));
429
430 if (count > LP_BUFFER_SIZE)
431 count = LP_BUFFER_SIZE;
432
433 if (mutex_lock_interruptible(&lp_table[minor].port_mutex))
434 return -EINTR;
435
436 lp_claim_parport_or_block(&lp_table[minor]);
437
438 parport_set_timeout(lp_table[minor].dev,
439 (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK
440 : lp_table[minor].timeout));
441
442 parport_negotiate(lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
443 if (parport_negotiate(lp_table[minor].dev->port,
444 IEEE1284_MODE_NIBBLE)) {
445 retval = -EIO;
446 goto out;
447 }
448
449 while (retval == 0) {
450 retval = parport_read(port, kbuf, count);
451
452 if (retval > 0)
453 break;
454
455 if (nonblock) {
456 retval = -EAGAIN;
457 break;
458 }
459
460 /* Wait for data. */
461
462 if (lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE) {
463 parport_negotiate(lp_table[minor].dev->port,
464 IEEE1284_MODE_COMPAT);
465 lp_error(minor);
466 if (parport_negotiate(lp_table[minor].dev->port,
467 IEEE1284_MODE_NIBBLE)) {
468 retval = -EIO;
469 goto out;
470 }
471 } else {
472 prepare_to_wait(&lp_table[minor].waitq, &wait, TASK_INTERRUPTIBLE);
473 schedule_timeout(LP_TIMEOUT_POLLED);
474 finish_wait(&lp_table[minor].waitq, &wait);
475 }
476
477 if (signal_pending(current)) {
478 retval = -ERESTARTSYS;
479 break;
480 }
481
482 cond_resched();
483 }
484 parport_negotiate(lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
485 out:
486 lp_release_parport(&lp_table[minor]);
487
488 if (retval > 0 && copy_to_user(buf, kbuf, retval))
489 retval = -EFAULT;
490
491 mutex_unlock(&lp_table[minor].port_mutex);
492
493 return retval;
494}
495
496#endif /* IEEE 1284 support */
497
498static int lp_open(struct inode *inode, struct file *file)
499{
500 unsigned int minor = iminor(inode);
501 int ret = 0;
502
503 mutex_lock(&lp_mutex);
504 if (minor >= LP_NO) {
505 ret = -ENXIO;
506 goto out;
507 }
508 if ((LP_F(minor) & LP_EXIST) == 0) {
509 ret = -ENXIO;
510 goto out;
511 }
512 if (test_and_set_bit(LP_BUSY_BIT_POS, &LP_F(minor))) {
513 ret = -EBUSY;
514 goto out;
515 }
516 /* If ABORTOPEN is set and the printer is offline or out of paper,
517 we may still want to open it to perform ioctl()s. Therefore we
518 have commandeered O_NONBLOCK, even though it is being used in
519 a non-standard manner. This is strictly a Linux hack, and
520 should most likely only ever be used by the tunelp application. */
521 if ((LP_F(minor) & LP_ABORTOPEN) && !(file->f_flags & O_NONBLOCK)) {
522 int status;
523 lp_claim_parport_or_block(&lp_table[minor]);
524 status = r_str(minor);
525 lp_release_parport(&lp_table[minor]);
526 if (status & LP_POUTPA) {
527 printk(KERN_INFO "lp%d out of paper\n", minor);
528 LP_F(minor) &= ~LP_BUSY;
529 ret = -ENOSPC;
530 goto out;
531 } else if (!(status & LP_PSELECD)) {
532 printk(KERN_INFO "lp%d off-line\n", minor);
533 LP_F(minor) &= ~LP_BUSY;
534 ret = -EIO;
535 goto out;
536 } else if (!(status & LP_PERRORP)) {
537 printk(KERN_ERR "lp%d printer error\n", minor);
538 LP_F(minor) &= ~LP_BUSY;
539 ret = -EIO;
540 goto out;
541 }
542 }
543 lp_table[minor].lp_buffer = kmalloc(LP_BUFFER_SIZE, GFP_KERNEL);
544 if (!lp_table[minor].lp_buffer) {
545 LP_F(minor) &= ~LP_BUSY;
546 ret = -ENOMEM;
547 goto out;
548 }
549 /* Determine if the peripheral supports ECP mode */
550 lp_claim_parport_or_block(&lp_table[minor]);
551 if ((lp_table[minor].dev->port->modes & PARPORT_MODE_ECP) &&
552 !parport_negotiate(lp_table[minor].dev->port,
553 IEEE1284_MODE_ECP)) {
554 printk(KERN_INFO "lp%d: ECP mode\n", minor);
555 lp_table[minor].best_mode = IEEE1284_MODE_ECP;
556 } else {
557 lp_table[minor].best_mode = IEEE1284_MODE_COMPAT;
558 }
559 /* Leave peripheral in compatibility mode */
560 parport_negotiate(lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
561 lp_release_parport(&lp_table[minor]);
562 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
563out:
564 mutex_unlock(&lp_mutex);
565 return ret;
566}
567
568static int lp_release(struct inode *inode, struct file *file)
569{
570 unsigned int minor = iminor(inode);
571
572 lp_claim_parport_or_block(&lp_table[minor]);
573 parport_negotiate(lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
574 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
575 lp_release_parport(&lp_table[minor]);
576 kfree(lp_table[minor].lp_buffer);
577 lp_table[minor].lp_buffer = NULL;
578 LP_F(minor) &= ~LP_BUSY;
579 return 0;
580}
581
582static int lp_do_ioctl(unsigned int minor, unsigned int cmd,
583 unsigned long arg, void __user *argp)
584{
585 int status;
586 int retval = 0;
587
588#ifdef LP_DEBUG
589 printk(KERN_DEBUG "lp%d ioctl, cmd: 0x%x, arg: 0x%lx\n", minor, cmd, arg);
590#endif
591 if (minor >= LP_NO)
592 return -ENODEV;
593 if ((LP_F(minor) & LP_EXIST) == 0)
594 return -ENODEV;
595 switch (cmd) {
596 case LPTIME:
597 if (arg > UINT_MAX / HZ)
598 return -EINVAL;
599 LP_TIME(minor) = arg * HZ/100;
600 break;
601 case LPCHAR:
602 LP_CHAR(minor) = arg;
603 break;
604 case LPABORT:
605 if (arg)
606 LP_F(minor) |= LP_ABORT;
607 else
608 LP_F(minor) &= ~LP_ABORT;
609 break;
610 case LPABORTOPEN:
611 if (arg)
612 LP_F(minor) |= LP_ABORTOPEN;
613 else
614 LP_F(minor) &= ~LP_ABORTOPEN;
615 break;
616 case LPCAREFUL:
617 if (arg)
618 LP_F(minor) |= LP_CAREFUL;
619 else
620 LP_F(minor) &= ~LP_CAREFUL;
621 break;
622 case LPWAIT:
623 LP_WAIT(minor) = arg;
624 break;
625 case LPSETIRQ:
626 return -EINVAL;
627 case LPGETIRQ:
628 if (copy_to_user(argp, &LP_IRQ(minor),
629 sizeof(int)))
630 return -EFAULT;
631 break;
632 case LPGETSTATUS:
633 if (mutex_lock_interruptible(&lp_table[minor].port_mutex))
634 return -EINTR;
635 lp_claim_parport_or_block(&lp_table[minor]);
636 status = r_str(minor);
637 lp_release_parport(&lp_table[minor]);
638 mutex_unlock(&lp_table[minor].port_mutex);
639
640 if (copy_to_user(argp, &status, sizeof(int)))
641 return -EFAULT;
642 break;
643 case LPRESET:
644 lp_reset(minor);
645 break;
646#ifdef LP_STATS
647 case LPGETSTATS:
648 if (copy_to_user(argp, &LP_STAT(minor),
649 sizeof(struct lp_stats)))
650 return -EFAULT;
651 if (capable(CAP_SYS_ADMIN))
652 memset(&LP_STAT(minor), 0,
653 sizeof(struct lp_stats));
654 break;
655#endif
656 case LPGETFLAGS:
657 status = LP_F(minor);
658 if (copy_to_user(argp, &status, sizeof(int)))
659 return -EFAULT;
660 break;
661
662 default:
663 retval = -EINVAL;
664 }
665 return retval;
666}
667
668static int lp_set_timeout(unsigned int minor, s64 tv_sec, long tv_usec)
669{
670 long to_jiffies;
671
672 /* Convert to jiffies, place in lp_table */
673 if (tv_sec < 0 || tv_usec < 0)
674 return -EINVAL;
675
676 /*
677 * we used to not check, so let's not make this fatal,
678 * but deal with user space passing a 32-bit tv_nsec in
679 * a 64-bit field, capping the timeout to 1 second
680 * worth of microseconds, and capping the total at
681 * MAX_JIFFY_OFFSET.
682 */
683 if (tv_usec > 999999)
684 tv_usec = 999999;
685
686 if (tv_sec >= MAX_SEC_IN_JIFFIES - 1) {
687 to_jiffies = MAX_JIFFY_OFFSET;
688 } else {
689 to_jiffies = DIV_ROUND_UP(tv_usec, 1000000/HZ);
690 to_jiffies += tv_sec * (long) HZ;
691 }
692
693 if (to_jiffies <= 0) {
694 return -EINVAL;
695 }
696 lp_table[minor].timeout = to_jiffies;
697 return 0;
698}
699
700static int lp_set_timeout32(unsigned int minor, void __user *arg)
701{
702 s32 karg[2];
703
704 if (copy_from_user(karg, arg, sizeof(karg)))
705 return -EFAULT;
706
707 return lp_set_timeout(minor, karg[0], karg[1]);
708}
709
710static int lp_set_timeout64(unsigned int minor, void __user *arg)
711{
712 s64 karg[2];
713
714 if (copy_from_user(karg, arg, sizeof(karg)))
715 return -EFAULT;
716
717 /* sparc64 suseconds_t is 32-bit only */
718 if (IS_ENABLED(CONFIG_SPARC64) && !in_compat_syscall())
719 karg[1] >>= 32;
720
721 return lp_set_timeout(minor, karg[0], karg[1]);
722}
723
724static long lp_ioctl(struct file *file, unsigned int cmd,
725 unsigned long arg)
726{
727 unsigned int minor;
728 int ret;
729
730 minor = iminor(file_inode(file));
731 mutex_lock(&lp_mutex);
732 switch (cmd) {
733 case LPSETTIMEOUT_OLD:
734 if (BITS_PER_LONG == 32) {
735 ret = lp_set_timeout32(minor, (void __user *)arg);
736 break;
737 }
738 fallthrough; /* for 64-bit */
739 case LPSETTIMEOUT_NEW:
740 ret = lp_set_timeout64(minor, (void __user *)arg);
741 break;
742 default:
743 ret = lp_do_ioctl(minor, cmd, arg, (void __user *)arg);
744 break;
745 }
746 mutex_unlock(&lp_mutex);
747
748 return ret;
749}
750
751#ifdef CONFIG_COMPAT
752static long lp_compat_ioctl(struct file *file, unsigned int cmd,
753 unsigned long arg)
754{
755 unsigned int minor;
756 int ret;
757
758 minor = iminor(file_inode(file));
759 mutex_lock(&lp_mutex);
760 switch (cmd) {
761 case LPSETTIMEOUT_OLD:
762 if (!COMPAT_USE_64BIT_TIME) {
763 ret = lp_set_timeout32(minor, (void __user *)arg);
764 break;
765 }
766 fallthrough; /* for x32 mode */
767 case LPSETTIMEOUT_NEW:
768 ret = lp_set_timeout64(minor, (void __user *)arg);
769 break;
770#ifdef LP_STATS
771 case LPGETSTATS:
772 /* FIXME: add an implementation if you set LP_STATS */
773 ret = -EINVAL;
774 break;
775#endif
776 default:
777 ret = lp_do_ioctl(minor, cmd, arg, compat_ptr(arg));
778 break;
779 }
780 mutex_unlock(&lp_mutex);
781
782 return ret;
783}
784#endif
785
786static const struct file_operations lp_fops = {
787 .owner = THIS_MODULE,
788 .write = lp_write,
789 .unlocked_ioctl = lp_ioctl,
790#ifdef CONFIG_COMPAT
791 .compat_ioctl = lp_compat_ioctl,
792#endif
793 .open = lp_open,
794 .release = lp_release,
795#ifdef CONFIG_PARPORT_1284
796 .read = lp_read,
797#endif
798 .llseek = noop_llseek,
799};
800
801/* --- support for console on the line printer ----------------- */
802
803#ifdef CONFIG_LP_CONSOLE
804
805#define CONSOLE_LP 0
806
807/* If the printer is out of paper, we can either lose the messages or
808 * stall until the printer is happy again. Define CONSOLE_LP_STRICT
809 * non-zero to get the latter behaviour. */
810#define CONSOLE_LP_STRICT 1
811
812/* The console must be locked when we get here. */
813
814static void lp_console_write(struct console *co, const char *s,
815 unsigned count)
816{
817 struct pardevice *dev = lp_table[CONSOLE_LP].dev;
818 struct parport *port = dev->port;
819 ssize_t written;
820
821 if (parport_claim(dev))
822 /* Nothing we can do. */
823 return;
824
825 parport_set_timeout(dev, 0);
826
827 /* Go to compatibility mode. */
828 parport_negotiate(port, IEEE1284_MODE_COMPAT);
829
830 do {
831 /* Write the data, converting LF->CRLF as we go. */
832 ssize_t canwrite = count;
833 char *lf = memchr(s, '\n', count);
834 if (lf)
835 canwrite = lf - s;
836
837 if (canwrite > 0) {
838 written = parport_write(port, s, canwrite);
839
840 if (written <= 0)
841 continue;
842
843 s += written;
844 count -= written;
845 canwrite -= written;
846 }
847
848 if (lf && canwrite <= 0) {
849 const char *crlf = "\r\n";
850 int i = 2;
851
852 /* Dodge the original '\n', and put '\r\n' instead. */
853 s++;
854 count--;
855 do {
856 written = parport_write(port, crlf, i);
857 if (written > 0) {
858 i -= written;
859 crlf += written;
860 }
861 } while (i > 0 && (CONSOLE_LP_STRICT || written > 0));
862 }
863 } while (count > 0 && (CONSOLE_LP_STRICT || written > 0));
864
865 parport_release(dev);
866}
867
868static struct console lpcons = {
869 .name = "lp",
870 .write = lp_console_write,
871 .flags = CON_PRINTBUFFER,
872};
873
874#endif /* console on line printer */
875
876/* --- initialisation code ------------------------------------- */
877
878static int parport_nr[LP_NO] = { [0 ... LP_NO-1] = LP_PARPORT_UNSPEC };
879static char *parport[LP_NO];
880static bool reset;
881
882module_param_array(parport, charp, NULL, 0);
883module_param(reset, bool, 0);
884
885#ifndef MODULE
886static int __init lp_setup(char *str)
887{
888 static int parport_ptr;
889 int x;
890
891 if (get_option(&str, &x)) {
892 if (x == 0) {
893 /* disable driver on "lp=" or "lp=0" */
894 parport_nr[0] = LP_PARPORT_OFF;
895 } else {
896 printk(KERN_WARNING "warning: 'lp=0x%x' is deprecated, ignored\n", x);
897 return 0;
898 }
899 } else if (!strncmp(str, "parport", 7)) {
900 int n = simple_strtoul(str+7, NULL, 10);
901 if (parport_ptr < LP_NO)
902 parport_nr[parport_ptr++] = n;
903 else
904 printk(KERN_INFO "lp: too many ports, %s ignored.\n",
905 str);
906 } else if (!strcmp(str, "auto")) {
907 parport_nr[0] = LP_PARPORT_AUTO;
908 } else if (!strcmp(str, "none")) {
909 if (parport_ptr < LP_NO)
910 parport_nr[parport_ptr++] = LP_PARPORT_NONE;
911 else
912 printk(KERN_INFO "lp: too many ports, %s ignored.\n",
913 str);
914 } else if (!strcmp(str, "reset")) {
915 reset = true;
916 }
917 return 1;
918}
919#endif
920
921static int lp_register(int nr, struct parport *port)
922{
923 struct pardev_cb ppdev_cb;
924
925 memset(&ppdev_cb, 0, sizeof(ppdev_cb));
926 ppdev_cb.preempt = lp_preempt;
927 ppdev_cb.private = &lp_table[nr];
928 lp_table[nr].dev = parport_register_dev_model(port, "lp",
929 &ppdev_cb, nr);
930 if (lp_table[nr].dev == NULL)
931 return 1;
932 lp_table[nr].flags |= LP_EXIST;
933
934 if (reset)
935 lp_reset(nr);
936
937 device_create(&lp_class, port->dev, MKDEV(LP_MAJOR, nr), NULL,
938 "lp%d", nr);
939
940 printk(KERN_INFO "lp%d: using %s (%s).\n", nr, port->name,
941 (port->irq == PARPORT_IRQ_NONE)?"polling":"interrupt-driven");
942
943#ifdef CONFIG_LP_CONSOLE
944 if (!nr) {
945 if (port->modes & PARPORT_MODE_SAFEININT) {
946 register_console(&lpcons);
947 console_registered = port;
948 printk(KERN_INFO "lp%d: console ready\n", CONSOLE_LP);
949 } else
950 printk(KERN_ERR "lp%d: cannot run console on %s\n",
951 CONSOLE_LP, port->name);
952 }
953#endif
954 port_num[nr] = port->number;
955
956 return 0;
957}
958
959static void lp_attach(struct parport *port)
960{
961 unsigned int i;
962
963 switch (parport_nr[0]) {
964 case LP_PARPORT_UNSPEC:
965 case LP_PARPORT_AUTO:
966 if (parport_nr[0] == LP_PARPORT_AUTO &&
967 port->probe_info[0].class != PARPORT_CLASS_PRINTER)
968 return;
969 if (lp_count == LP_NO) {
970 printk(KERN_INFO "lp: ignoring parallel port (max. %d)\n",LP_NO);
971 return;
972 }
973 for (i = 0; i < LP_NO; i++)
974 if (port_num[i] == -1)
975 break;
976
977 if (!lp_register(i, port))
978 lp_count++;
979 break;
980
981 default:
982 for (i = 0; i < LP_NO; i++) {
983 if (port->number == parport_nr[i]) {
984 if (!lp_register(i, port))
985 lp_count++;
986 break;
987 }
988 }
989 break;
990 }
991}
992
993static void lp_detach(struct parport *port)
994{
995 int n;
996
997 /* Write this some day. */
998#ifdef CONFIG_LP_CONSOLE
999 if (console_registered == port) {
1000 unregister_console(&lpcons);
1001 console_registered = NULL;
1002 }
1003#endif /* CONFIG_LP_CONSOLE */
1004
1005 for (n = 0; n < LP_NO; n++) {
1006 if (port_num[n] == port->number) {
1007 port_num[n] = -1;
1008 lp_count--;
1009 device_destroy(&lp_class, MKDEV(LP_MAJOR, n));
1010 parport_unregister_device(lp_table[n].dev);
1011 }
1012 }
1013}
1014
1015static struct parport_driver lp_driver = {
1016 .name = "lp",
1017 .match_port = lp_attach,
1018 .detach = lp_detach,
1019};
1020
1021static int __init lp_init(void)
1022{
1023 int i, err;
1024
1025 if (parport_nr[0] == LP_PARPORT_OFF)
1026 return 0;
1027
1028 for (i = 0; i < LP_NO; i++) {
1029 lp_table[i].dev = NULL;
1030 lp_table[i].flags = 0;
1031 lp_table[i].chars = LP_INIT_CHAR;
1032 lp_table[i].time = LP_INIT_TIME;
1033 lp_table[i].wait = LP_INIT_WAIT;
1034 lp_table[i].lp_buffer = NULL;
1035#ifdef LP_STATS
1036 lp_table[i].lastcall = 0;
1037 lp_table[i].runchars = 0;
1038 memset(&lp_table[i].stats, 0, sizeof(struct lp_stats));
1039#endif
1040 lp_table[i].last_error = 0;
1041 init_waitqueue_head(&lp_table[i].waitq);
1042 init_waitqueue_head(&lp_table[i].dataq);
1043 mutex_init(&lp_table[i].port_mutex);
1044 lp_table[i].timeout = 10 * HZ;
1045 port_num[i] = -1;
1046 }
1047
1048 if (register_chrdev(LP_MAJOR, "lp", &lp_fops)) {
1049 printk(KERN_ERR "lp: unable to get major %d\n", LP_MAJOR);
1050 return -EIO;
1051 }
1052
1053 err = class_register(&lp_class);
1054 if (err)
1055 goto out_reg;
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_unregister(&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_unregister(&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_DESCRIPTION("Generic parallel printer driver");
1126MODULE_LICENSE("GPL");