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/signal.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 <linux/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];
144static int port_num[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)
228 lp_release_parport(&lp_table[minor]);
229 prepare_to_wait(&lp_table[minor].waitq, &wait, TASK_INTERRUPTIBLE);
230 schedule_timeout(LP_TIMEOUT_POLLED);
231 finish_wait(&lp_table[minor].waitq, &wait);
232 if (polling)
233 lp_claim_parport_or_block(&lp_table[minor]);
234 else
235 parport_yield_blocking(lp_table[minor].dev);
236}
237
238static int lp_check_status(int minor)
239{
240 int error = 0;
241 unsigned int last = lp_table[minor].last_error;
242 unsigned char status = r_str(minor);
243 if ((status & LP_PERRORP) && !(LP_F(minor) & LP_CAREFUL))
244 /* No error. */
245 last = 0;
246 else if ((status & LP_POUTPA)) {
247 if (last != LP_POUTPA) {
248 last = LP_POUTPA;
249 printk(KERN_INFO "lp%d out of paper\n", minor);
250 }
251 error = -ENOSPC;
252 } else if (!(status & LP_PSELECD)) {
253 if (last != LP_PSELECD) {
254 last = LP_PSELECD;
255 printk(KERN_INFO "lp%d off-line\n", minor);
256 }
257 error = -EIO;
258 } else if (!(status & LP_PERRORP)) {
259 if (last != LP_PERRORP) {
260 last = LP_PERRORP;
261 printk(KERN_INFO "lp%d on fire\n", minor);
262 }
263 error = -EIO;
264 } else {
265 last = 0; /* Come here if LP_CAREFUL is set and no
266 errors are reported. */
267 }
268
269 lp_table[minor].last_error = last;
270
271 if (last != 0)
272 lp_error(minor);
273
274 return error;
275}
276
277static int lp_wait_ready(int minor, int nonblock)
278{
279 int error = 0;
280
281 /* If we're not in compatibility mode, we're ready now! */
282 if (lp_table[minor].current_mode != IEEE1284_MODE_COMPAT) {
283 return 0;
284 }
285
286 do {
287 error = lp_check_status(minor);
288 if (error && (nonblock || (LP_F(minor) & LP_ABORT)))
289 break;
290 if (signal_pending(current)) {
291 error = -EINTR;
292 break;
293 }
294 } while (error);
295 return error;
296}
297
298static ssize_t lp_write(struct file *file, const char __user *buf,
299 size_t count, loff_t *ppos)
300{
301 unsigned int minor = iminor(file_inode(file));
302 struct parport *port = lp_table[minor].dev->port;
303 char *kbuf = lp_table[minor].lp_buffer;
304 ssize_t retv = 0;
305 ssize_t written;
306 size_t copy_size = count;
307 int nonblock = ((file->f_flags & O_NONBLOCK) ||
308 (LP_F(minor) & LP_ABORT));
309
310#ifdef LP_STATS
311 if (time_after(jiffies, lp_table[minor].lastcall + LP_TIME(minor)))
312 lp_table[minor].runchars = 0;
313
314 lp_table[minor].lastcall = jiffies;
315#endif
316
317 /* Need to copy the data from user-space. */
318 if (copy_size > LP_BUFFER_SIZE)
319 copy_size = LP_BUFFER_SIZE;
320
321 if (mutex_lock_interruptible(&lp_table[minor].port_mutex))
322 return -EINTR;
323
324 if (copy_from_user(kbuf, buf, copy_size)) {
325 retv = -EFAULT;
326 goto out_unlock;
327 }
328
329 /* Claim Parport or sleep until it becomes available
330 */
331 lp_claim_parport_or_block(&lp_table[minor]);
332 /* Go to the proper mode. */
333 lp_table[minor].current_mode = lp_negotiate(port,
334 lp_table[minor].best_mode);
335
336 parport_set_timeout(lp_table[minor].dev,
337 (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK
338 : lp_table[minor].timeout));
339
340 if ((retv = lp_wait_ready(minor, nonblock)) == 0)
341 do {
342 /* Write the data. */
343 written = parport_write(port, kbuf, copy_size);
344 if (written > 0) {
345 copy_size -= written;
346 count -= written;
347 buf += written;
348 retv += written;
349 }
350
351 if (signal_pending(current)) {
352 if (retv == 0)
353 retv = -EINTR;
354
355 break;
356 }
357
358 if (copy_size > 0) {
359 /* incomplete write -> check error ! */
360 int error;
361
362 parport_negotiate(lp_table[minor].dev->port,
363 IEEE1284_MODE_COMPAT);
364 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
365
366 error = lp_wait_ready(minor, nonblock);
367
368 if (error) {
369 if (retv == 0)
370 retv = error;
371 break;
372 } else if (nonblock) {
373 if (retv == 0)
374 retv = -EAGAIN;
375 break;
376 }
377
378 parport_yield_blocking(lp_table[minor].dev);
379 lp_table[minor].current_mode
380 = lp_negotiate(port,
381 lp_table[minor].best_mode);
382
383 } else if (need_resched())
384 schedule();
385
386 if (count) {
387 copy_size = count;
388 if (copy_size > LP_BUFFER_SIZE)
389 copy_size = LP_BUFFER_SIZE;
390
391 if (copy_from_user(kbuf, buf, copy_size)) {
392 if (retv == 0)
393 retv = -EFAULT;
394 break;
395 }
396 }
397 } while (count > 0);
398
399 if (test_and_clear_bit(LP_PREEMPT_REQUEST,
400 &lp_table[minor].bits)) {
401 printk(KERN_INFO "lp%d releasing parport\n", minor);
402 parport_negotiate(lp_table[minor].dev->port,
403 IEEE1284_MODE_COMPAT);
404 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
405 lp_release_parport(&lp_table[minor]);
406 }
407out_unlock:
408 mutex_unlock(&lp_table[minor].port_mutex);
409
410 return retv;
411}
412
413#ifdef CONFIG_PARPORT_1284
414
415/* Status readback conforming to ieee1284 */
416static ssize_t lp_read(struct file *file, char __user *buf,
417 size_t count, loff_t *ppos)
418{
419 DEFINE_WAIT(wait);
420 unsigned int minor=iminor(file_inode(file));
421 struct parport *port = lp_table[minor].dev->port;
422 ssize_t retval = 0;
423 char *kbuf = lp_table[minor].lp_buffer;
424 int nonblock = ((file->f_flags & O_NONBLOCK) ||
425 (LP_F(minor) & LP_ABORT));
426
427 if (count > LP_BUFFER_SIZE)
428 count = LP_BUFFER_SIZE;
429
430 if (mutex_lock_interruptible(&lp_table[minor].port_mutex))
431 return -EINTR;
432
433 lp_claim_parport_or_block(&lp_table[minor]);
434
435 parport_set_timeout(lp_table[minor].dev,
436 (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK
437 : lp_table[minor].timeout));
438
439 parport_negotiate(lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
440 if (parport_negotiate(lp_table[minor].dev->port,
441 IEEE1284_MODE_NIBBLE)) {
442 retval = -EIO;
443 goto out;
444 }
445
446 while (retval == 0) {
447 retval = parport_read(port, kbuf, count);
448
449 if (retval > 0)
450 break;
451
452 if (nonblock) {
453 retval = -EAGAIN;
454 break;
455 }
456
457 /* Wait for data. */
458
459 if (lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE) {
460 parport_negotiate(lp_table[minor].dev->port,
461 IEEE1284_MODE_COMPAT);
462 lp_error(minor);
463 if (parport_negotiate(lp_table[minor].dev->port,
464 IEEE1284_MODE_NIBBLE)) {
465 retval = -EIO;
466 goto out;
467 }
468 } else {
469 prepare_to_wait(&lp_table[minor].waitq, &wait, TASK_INTERRUPTIBLE);
470 schedule_timeout(LP_TIMEOUT_POLLED);
471 finish_wait(&lp_table[minor].waitq, &wait);
472 }
473
474 if (signal_pending(current)) {
475 retval = -ERESTARTSYS;
476 break;
477 }
478
479 cond_resched();
480 }
481 parport_negotiate(lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
482 out:
483 lp_release_parport(&lp_table[minor]);
484
485 if (retval > 0 && copy_to_user(buf, kbuf, retval))
486 retval = -EFAULT;
487
488 mutex_unlock(&lp_table[minor].port_mutex);
489
490 return retval;
491}
492
493#endif /* IEEE 1284 support */
494
495static int lp_open(struct inode *inode, struct file *file)
496{
497 unsigned int minor = iminor(inode);
498 int ret = 0;
499
500 mutex_lock(&lp_mutex);
501 if (minor >= LP_NO) {
502 ret = -ENXIO;
503 goto out;
504 }
505 if ((LP_F(minor) & LP_EXIST) == 0) {
506 ret = -ENXIO;
507 goto out;
508 }
509 if (test_and_set_bit(LP_BUSY_BIT_POS, &LP_F(minor))) {
510 ret = -EBUSY;
511 goto out;
512 }
513 /* If ABORTOPEN is set and the printer is offline or out of paper,
514 we may still want to open it to perform ioctl()s. Therefore we
515 have commandeered O_NONBLOCK, even though it is being used in
516 a non-standard manner. This is strictly a Linux hack, and
517 should most likely only ever be used by the tunelp application. */
518 if ((LP_F(minor) & LP_ABORTOPEN) && !(file->f_flags & O_NONBLOCK)) {
519 int status;
520 lp_claim_parport_or_block(&lp_table[minor]);
521 status = r_str(minor);
522 lp_release_parport(&lp_table[minor]);
523 if (status & LP_POUTPA) {
524 printk(KERN_INFO "lp%d out of paper\n", minor);
525 LP_F(minor) &= ~LP_BUSY;
526 ret = -ENOSPC;
527 goto out;
528 } else if (!(status & LP_PSELECD)) {
529 printk(KERN_INFO "lp%d off-line\n", minor);
530 LP_F(minor) &= ~LP_BUSY;
531 ret = -EIO;
532 goto out;
533 } else if (!(status & LP_PERRORP)) {
534 printk(KERN_ERR "lp%d printer error\n", minor);
535 LP_F(minor) &= ~LP_BUSY;
536 ret = -EIO;
537 goto out;
538 }
539 }
540 lp_table[minor].lp_buffer = kmalloc(LP_BUFFER_SIZE, GFP_KERNEL);
541 if (!lp_table[minor].lp_buffer) {
542 LP_F(minor) &= ~LP_BUSY;
543 ret = -ENOMEM;
544 goto out;
545 }
546 /* Determine if the peripheral supports ECP mode */
547 lp_claim_parport_or_block(&lp_table[minor]);
548 if ( (lp_table[minor].dev->port->modes & PARPORT_MODE_ECP) &&
549 !parport_negotiate(lp_table[minor].dev->port,
550 IEEE1284_MODE_ECP)) {
551 printk(KERN_INFO "lp%d: ECP mode\n", minor);
552 lp_table[minor].best_mode = IEEE1284_MODE_ECP;
553 } else {
554 lp_table[minor].best_mode = IEEE1284_MODE_COMPAT;
555 }
556 /* Leave peripheral in compatibility mode */
557 parport_negotiate(lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
558 lp_release_parport(&lp_table[minor]);
559 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
560out:
561 mutex_unlock(&lp_mutex);
562 return ret;
563}
564
565static int lp_release(struct inode *inode, struct file *file)
566{
567 unsigned int minor = iminor(inode);
568
569 lp_claim_parport_or_block(&lp_table[minor]);
570 parport_negotiate(lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
571 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
572 lp_release_parport(&lp_table[minor]);
573 kfree(lp_table[minor].lp_buffer);
574 lp_table[minor].lp_buffer = NULL;
575 LP_F(minor) &= ~LP_BUSY;
576 return 0;
577}
578
579static int lp_do_ioctl(unsigned int minor, unsigned int cmd,
580 unsigned long arg, void __user *argp)
581{
582 int status;
583 int retval = 0;
584
585#ifdef LP_DEBUG
586 printk(KERN_DEBUG "lp%d ioctl, cmd: 0x%x, arg: 0x%lx\n", minor, cmd, arg);
587#endif
588 if (minor >= LP_NO)
589 return -ENODEV;
590 if ((LP_F(minor) & LP_EXIST) == 0)
591 return -ENODEV;
592 switch ( cmd ) {
593 case LPTIME:
594 if (arg > UINT_MAX / HZ)
595 return -EINVAL;
596 LP_TIME(minor) = arg * HZ/100;
597 break;
598 case LPCHAR:
599 LP_CHAR(minor) = arg;
600 break;
601 case LPABORT:
602 if (arg)
603 LP_F(minor) |= LP_ABORT;
604 else
605 LP_F(minor) &= ~LP_ABORT;
606 break;
607 case LPABORTOPEN:
608 if (arg)
609 LP_F(minor) |= LP_ABORTOPEN;
610 else
611 LP_F(minor) &= ~LP_ABORTOPEN;
612 break;
613 case LPCAREFUL:
614 if (arg)
615 LP_F(minor) |= LP_CAREFUL;
616 else
617 LP_F(minor) &= ~LP_CAREFUL;
618 break;
619 case LPWAIT:
620 LP_WAIT(minor) = arg;
621 break;
622 case LPSETIRQ:
623 return -EINVAL;
624 break;
625 case LPGETIRQ:
626 if (copy_to_user(argp, &LP_IRQ(minor),
627 sizeof(int)))
628 return -EFAULT;
629 break;
630 case LPGETSTATUS:
631 if (mutex_lock_interruptible(&lp_table[minor].port_mutex))
632 return -EINTR;
633 lp_claim_parport_or_block(&lp_table[minor]);
634 status = r_str(minor);
635 lp_release_parport(&lp_table[minor]);
636 mutex_unlock(&lp_table[minor].port_mutex);
637
638 if (copy_to_user(argp, &status, sizeof(int)))
639 return -EFAULT;
640 break;
641 case LPRESET:
642 lp_reset(minor);
643 break;
644#ifdef LP_STATS
645 case LPGETSTATS:
646 if (copy_to_user(argp, &LP_STAT(minor),
647 sizeof(struct lp_stats)))
648 return -EFAULT;
649 if (capable(CAP_SYS_ADMIN))
650 memset(&LP_STAT(minor), 0,
651 sizeof(struct lp_stats));
652 break;
653#endif
654 case LPGETFLAGS:
655 status = LP_F(minor);
656 if (copy_to_user(argp, &status, sizeof(int)))
657 return -EFAULT;
658 break;
659
660 default:
661 retval = -EINVAL;
662 }
663 return retval;
664}
665
666static int lp_set_timeout(unsigned int minor, s64 tv_sec, long tv_usec)
667{
668 long to_jiffies;
669
670 /* Convert to jiffies, place in lp_table */
671 if (tv_sec < 0 || tv_usec < 0)
672 return -EINVAL;
673
674 /*
675 * we used to not check, so let's not make this fatal,
676 * but deal with user space passing a 32-bit tv_nsec in
677 * a 64-bit field, capping the timeout to 1 second
678 * worth of microseconds, and capping the total at
679 * MAX_JIFFY_OFFSET.
680 */
681 if (tv_usec > 999999)
682 tv_usec = 999999;
683
684 if (tv_sec >= MAX_SEC_IN_JIFFIES - 1) {
685 to_jiffies = MAX_JIFFY_OFFSET;
686 } else {
687 to_jiffies = DIV_ROUND_UP(tv_usec, 1000000/HZ);
688 to_jiffies += tv_sec * (long) HZ;
689 }
690
691 if (to_jiffies <= 0) {
692 return -EINVAL;
693 }
694 lp_table[minor].timeout = to_jiffies;
695 return 0;
696}
697
698static int lp_set_timeout32(unsigned int minor, void __user *arg)
699{
700 s32 karg[2];
701
702 if (copy_from_user(karg, arg, sizeof(karg)))
703 return -EFAULT;
704
705 return lp_set_timeout(minor, karg[0], karg[1]);
706}
707
708static int lp_set_timeout64(unsigned int minor, void __user *arg)
709{
710 s64 karg[2];
711
712 if (copy_from_user(karg, arg, sizeof(karg)))
713 return -EFAULT;
714
715 return lp_set_timeout(minor, karg[0], karg[1]);
716}
717
718static long lp_ioctl(struct file *file, unsigned int cmd,
719 unsigned long arg)
720{
721 unsigned int minor;
722 int ret;
723
724 minor = iminor(file_inode(file));
725 mutex_lock(&lp_mutex);
726 switch (cmd) {
727 case LPSETTIMEOUT_OLD:
728 if (BITS_PER_LONG == 32) {
729 ret = lp_set_timeout32(minor, (void __user *)arg);
730 break;
731 }
732 /* fall through - for 64-bit */
733 case LPSETTIMEOUT_NEW:
734 ret = lp_set_timeout64(minor, (void __user *)arg);
735 break;
736 default:
737 ret = lp_do_ioctl(minor, cmd, arg, (void __user *)arg);
738 break;
739 }
740 mutex_unlock(&lp_mutex);
741
742 return ret;
743}
744
745#ifdef CONFIG_COMPAT
746static long lp_compat_ioctl(struct file *file, unsigned int cmd,
747 unsigned long arg)
748{
749 unsigned int minor;
750 int ret;
751
752 minor = iminor(file_inode(file));
753 mutex_lock(&lp_mutex);
754 switch (cmd) {
755 case LPSETTIMEOUT_OLD:
756 if (!COMPAT_USE_64BIT_TIME) {
757 ret = lp_set_timeout32(minor, (void __user *)arg);
758 break;
759 }
760 /* fall through - for x32 mode */
761 case LPSETTIMEOUT_NEW:
762 ret = lp_set_timeout64(minor, (void __user *)arg);
763 break;
764#ifdef LP_STATS
765 case LPGETSTATS:
766 /* FIXME: add an implementation if you set LP_STATS */
767 ret = -EINVAL;
768 break;
769#endif
770 default:
771 ret = lp_do_ioctl(minor, cmd, arg, compat_ptr(arg));
772 break;
773 }
774 mutex_unlock(&lp_mutex);
775
776 return ret;
777}
778#endif
779
780static const struct file_operations lp_fops = {
781 .owner = THIS_MODULE,
782 .write = lp_write,
783 .unlocked_ioctl = lp_ioctl,
784#ifdef CONFIG_COMPAT
785 .compat_ioctl = lp_compat_ioctl,
786#endif
787 .open = lp_open,
788 .release = lp_release,
789#ifdef CONFIG_PARPORT_1284
790 .read = lp_read,
791#endif
792 .llseek = noop_llseek,
793};
794
795/* --- support for console on the line printer ----------------- */
796
797#ifdef CONFIG_LP_CONSOLE
798
799#define CONSOLE_LP 0
800
801/* If the printer is out of paper, we can either lose the messages or
802 * stall until the printer is happy again. Define CONSOLE_LP_STRICT
803 * non-zero to get the latter behaviour. */
804#define CONSOLE_LP_STRICT 1
805
806/* The console must be locked when we get here. */
807
808static void lp_console_write(struct console *co, const char *s,
809 unsigned count)
810{
811 struct pardevice *dev = lp_table[CONSOLE_LP].dev;
812 struct parport *port = dev->port;
813 ssize_t written;
814
815 if (parport_claim(dev))
816 /* Nothing we can do. */
817 return;
818
819 parport_set_timeout(dev, 0);
820
821 /* Go to compatibility mode. */
822 parport_negotiate(port, IEEE1284_MODE_COMPAT);
823
824 do {
825 /* Write the data, converting LF->CRLF as we go. */
826 ssize_t canwrite = count;
827 char *lf = memchr(s, '\n', count);
828 if (lf)
829 canwrite = lf - s;
830
831 if (canwrite > 0) {
832 written = parport_write(port, s, canwrite);
833
834 if (written <= 0)
835 continue;
836
837 s += written;
838 count -= written;
839 canwrite -= written;
840 }
841
842 if (lf && canwrite <= 0) {
843 const char *crlf = "\r\n";
844 int i = 2;
845
846 /* Dodge the original '\n', and put '\r\n' instead. */
847 s++;
848 count--;
849 do {
850 written = parport_write(port, crlf, i);
851 if (written > 0)
852 i -= written, crlf += written;
853 } while (i > 0 && (CONSOLE_LP_STRICT || written > 0));
854 }
855 } while (count > 0 && (CONSOLE_LP_STRICT || written > 0));
856
857 parport_release(dev);
858}
859
860static struct console lpcons = {
861 .name = "lp",
862 .write = lp_console_write,
863 .flags = CON_PRINTBUFFER,
864};
865
866#endif /* console on line printer */
867
868/* --- initialisation code ------------------------------------- */
869
870static int parport_nr[LP_NO] = { [0 ... LP_NO-1] = LP_PARPORT_UNSPEC };
871static char *parport[LP_NO];
872static bool reset;
873
874module_param_array(parport, charp, NULL, 0);
875module_param(reset, bool, 0);
876
877#ifndef MODULE
878static int __init lp_setup(char *str)
879{
880 static int parport_ptr;
881 int x;
882
883 if (get_option(&str, &x)) {
884 if (x == 0) {
885 /* disable driver on "lp=" or "lp=0" */
886 parport_nr[0] = LP_PARPORT_OFF;
887 } else {
888 printk(KERN_WARNING "warning: 'lp=0x%x' is deprecated, ignored\n", x);
889 return 0;
890 }
891 } else if (!strncmp(str, "parport", 7)) {
892 int n = simple_strtoul(str+7, NULL, 10);
893 if (parport_ptr < LP_NO)
894 parport_nr[parport_ptr++] = n;
895 else
896 printk(KERN_INFO "lp: too many ports, %s ignored.\n",
897 str);
898 } else if (!strcmp(str, "auto")) {
899 parport_nr[0] = LP_PARPORT_AUTO;
900 } else if (!strcmp(str, "none")) {
901 if (parport_ptr < LP_NO)
902 parport_nr[parport_ptr++] = LP_PARPORT_NONE;
903 else
904 printk(KERN_INFO "lp: too many ports, %s ignored.\n",
905 str);
906 } else if (!strcmp(str, "reset")) {
907 reset = true;
908 }
909 return 1;
910}
911#endif
912
913static int lp_register(int nr, struct parport *port)
914{
915 struct pardev_cb ppdev_cb;
916
917 memset(&ppdev_cb, 0, sizeof(ppdev_cb));
918 ppdev_cb.preempt = lp_preempt;
919 ppdev_cb.private = &lp_table[nr];
920 lp_table[nr].dev = parport_register_dev_model(port, "lp",
921 &ppdev_cb, nr);
922 if (lp_table[nr].dev == NULL)
923 return 1;
924 lp_table[nr].flags |= LP_EXIST;
925
926 if (reset)
927 lp_reset(nr);
928
929 device_create(lp_class, port->dev, MKDEV(LP_MAJOR, nr), NULL,
930 "lp%d", nr);
931
932 printk(KERN_INFO "lp%d: using %s (%s).\n", nr, port->name,
933 (port->irq == PARPORT_IRQ_NONE)?"polling":"interrupt-driven");
934
935#ifdef CONFIG_LP_CONSOLE
936 if (!nr) {
937 if (port->modes & PARPORT_MODE_SAFEININT) {
938 register_console(&lpcons);
939 console_registered = port;
940 printk(KERN_INFO "lp%d: console ready\n", CONSOLE_LP);
941 } else
942 printk(KERN_ERR "lp%d: cannot run console on %s\n",
943 CONSOLE_LP, port->name);
944 }
945#endif
946 port_num[nr] = port->number;
947
948 return 0;
949}
950
951static void lp_attach(struct parport *port)
952{
953 unsigned int i;
954
955 switch (parport_nr[0]) {
956 case LP_PARPORT_UNSPEC:
957 case LP_PARPORT_AUTO:
958 if (parport_nr[0] == LP_PARPORT_AUTO &&
959 port->probe_info[0].class != PARPORT_CLASS_PRINTER)
960 return;
961 if (lp_count == LP_NO) {
962 printk(KERN_INFO "lp: ignoring parallel port (max. %d)\n",LP_NO);
963 return;
964 }
965 for (i = 0; i < LP_NO; i++)
966 if (port_num[i] == -1)
967 break;
968
969 if (!lp_register(i, port))
970 lp_count++;
971 break;
972
973 default:
974 for (i = 0; i < LP_NO; i++) {
975 if (port->number == parport_nr[i]) {
976 if (!lp_register(i, port))
977 lp_count++;
978 break;
979 }
980 }
981 break;
982 }
983}
984
985static void lp_detach(struct parport *port)
986{
987 int n;
988
989 /* Write this some day. */
990#ifdef CONFIG_LP_CONSOLE
991 if (console_registered == port) {
992 unregister_console(&lpcons);
993 console_registered = NULL;
994 }
995#endif /* CONFIG_LP_CONSOLE */
996
997 for (n = 0; n < LP_NO; n++) {
998 if (port_num[n] == port->number) {
999 port_num[n] = -1;
1000 lp_count--;
1001 device_destroy(lp_class, MKDEV(LP_MAJOR, n));
1002 parport_unregister_device(lp_table[n].dev);
1003 }
1004 }
1005}
1006
1007static struct parport_driver lp_driver = {
1008 .name = "lp",
1009 .match_port = lp_attach,
1010 .detach = lp_detach,
1011 .devmodel = true,
1012};
1013
1014static int __init lp_init(void)
1015{
1016 int i, err = 0;
1017
1018 if (parport_nr[0] == LP_PARPORT_OFF)
1019 return 0;
1020
1021 for (i = 0; i < LP_NO; i++) {
1022 lp_table[i].dev = NULL;
1023 lp_table[i].flags = 0;
1024 lp_table[i].chars = LP_INIT_CHAR;
1025 lp_table[i].time = LP_INIT_TIME;
1026 lp_table[i].wait = LP_INIT_WAIT;
1027 lp_table[i].lp_buffer = NULL;
1028#ifdef LP_STATS
1029 lp_table[i].lastcall = 0;
1030 lp_table[i].runchars = 0;
1031 memset(&lp_table[i].stats, 0, sizeof(struct lp_stats));
1032#endif
1033 lp_table[i].last_error = 0;
1034 init_waitqueue_head(&lp_table[i].waitq);
1035 init_waitqueue_head(&lp_table[i].dataq);
1036 mutex_init(&lp_table[i].port_mutex);
1037 lp_table[i].timeout = 10 * HZ;
1038 port_num[i] = -1;
1039 }
1040
1041 if (register_chrdev(LP_MAJOR, "lp", &lp_fops)) {
1042 printk(KERN_ERR "lp: unable to get major %d\n", LP_MAJOR);
1043 return -EIO;
1044 }
1045
1046 lp_class = class_create(THIS_MODULE, "printer");
1047 if (IS_ERR(lp_class)) {
1048 err = PTR_ERR(lp_class);
1049 goto out_reg;
1050 }
1051
1052 if (parport_register_driver(&lp_driver)) {
1053 printk(KERN_ERR "lp: unable to register with parport\n");
1054 err = -EIO;
1055 goto out_class;
1056 }
1057
1058 if (!lp_count) {
1059 printk(KERN_INFO "lp: driver loaded but no devices found\n");
1060#ifndef CONFIG_PARPORT_1284
1061 if (parport_nr[0] == LP_PARPORT_AUTO)
1062 printk(KERN_INFO "lp: (is IEEE 1284 support enabled?)\n");
1063#endif
1064 }
1065
1066 return 0;
1067
1068out_class:
1069 class_destroy(lp_class);
1070out_reg:
1071 unregister_chrdev(LP_MAJOR, "lp");
1072 return err;
1073}
1074
1075static int __init lp_init_module(void)
1076{
1077 if (parport[0]) {
1078 /* The user gave some parameters. Let's see what they were. */
1079 if (!strncmp(parport[0], "auto", 4))
1080 parport_nr[0] = LP_PARPORT_AUTO;
1081 else {
1082 int n;
1083 for (n = 0; n < LP_NO && parport[n]; n++) {
1084 if (!strncmp(parport[n], "none", 4))
1085 parport_nr[n] = LP_PARPORT_NONE;
1086 else {
1087 char *ep;
1088 unsigned long r = simple_strtoul(parport[n], &ep, 0);
1089 if (ep != parport[n])
1090 parport_nr[n] = r;
1091 else {
1092 printk(KERN_ERR "lp: bad port specifier `%s'\n", parport[n]);
1093 return -ENODEV;
1094 }
1095 }
1096 }
1097 }
1098 }
1099
1100 return lp_init();
1101}
1102
1103static void lp_cleanup_module(void)
1104{
1105 parport_unregister_driver(&lp_driver);
1106
1107#ifdef CONFIG_LP_CONSOLE
1108 unregister_console(&lpcons);
1109#endif
1110
1111 unregister_chrdev(LP_MAJOR, "lp");
1112 class_destroy(lp_class);
1113}
1114
1115__setup("lp=", lp_setup);
1116module_init(lp_init_module);
1117module_exit(lp_cleanup_module);
1118
1119MODULE_ALIAS_CHARDEV_MAJOR(LP_MAJOR);
1120MODULE_LICENSE("GPL");
1121