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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/*
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->f_path.dentry->d_inode);
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->f_path.dentry->d_inode);
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 LP_TIME(minor) = arg * HZ/100;
591 break;
592 case LPCHAR:
593 LP_CHAR(minor) = arg;
594 break;
595 case LPABORT:
596 if (arg)
597 LP_F(minor) |= LP_ABORT;
598 else
599 LP_F(minor) &= ~LP_ABORT;
600 break;
601 case LPABORTOPEN:
602 if (arg)
603 LP_F(minor) |= LP_ABORTOPEN;
604 else
605 LP_F(minor) &= ~LP_ABORTOPEN;
606 break;
607 case LPCAREFUL:
608 if (arg)
609 LP_F(minor) |= LP_CAREFUL;
610 else
611 LP_F(minor) &= ~LP_CAREFUL;
612 break;
613 case LPWAIT:
614 LP_WAIT(minor) = arg;
615 break;
616 case LPSETIRQ:
617 return -EINVAL;
618 break;
619 case LPGETIRQ:
620 if (copy_to_user(argp, &LP_IRQ(minor),
621 sizeof(int)))
622 return -EFAULT;
623 break;
624 case LPGETSTATUS:
625 lp_claim_parport_or_block (&lp_table[minor]);
626 status = r_str(minor);
627 lp_release_parport (&lp_table[minor]);
628
629 if (copy_to_user(argp, &status, sizeof(int)))
630 return -EFAULT;
631 break;
632 case LPRESET:
633 lp_reset(minor);
634 break;
635#ifdef LP_STATS
636 case LPGETSTATS:
637 if (copy_to_user(argp, &LP_STAT(minor),
638 sizeof(struct lp_stats)))
639 return -EFAULT;
640 if (capable(CAP_SYS_ADMIN))
641 memset(&LP_STAT(minor), 0,
642 sizeof(struct lp_stats));
643 break;
644#endif
645 case LPGETFLAGS:
646 status = LP_F(minor);
647 if (copy_to_user(argp, &status, sizeof(int)))
648 return -EFAULT;
649 break;
650
651 default:
652 retval = -EINVAL;
653 }
654 return retval;
655}
656
657static int lp_set_timeout(unsigned int minor, struct timeval *par_timeout)
658{
659 long to_jiffies;
660
661 /* Convert to jiffies, place in lp_table */
662 if ((par_timeout->tv_sec < 0) ||
663 (par_timeout->tv_usec < 0)) {
664 return -EINVAL;
665 }
666 to_jiffies = DIV_ROUND_UP(par_timeout->tv_usec, 1000000/HZ);
667 to_jiffies += par_timeout->tv_sec * (long) HZ;
668 if (to_jiffies <= 0) {
669 return -EINVAL;
670 }
671 lp_table[minor].timeout = to_jiffies;
672 return 0;
673}
674
675static long lp_ioctl(struct file *file, unsigned int cmd,
676 unsigned long arg)
677{
678 unsigned int minor;
679 struct timeval par_timeout;
680 int ret;
681
682 minor = iminor(file->f_path.dentry->d_inode);
683 mutex_lock(&lp_mutex);
684 switch (cmd) {
685 case LPSETTIMEOUT:
686 if (copy_from_user(&par_timeout, (void __user *)arg,
687 sizeof (struct timeval))) {
688 ret = -EFAULT;
689 break;
690 }
691 ret = lp_set_timeout(minor, &par_timeout);
692 break;
693 default:
694 ret = lp_do_ioctl(minor, cmd, arg, (void __user *)arg);
695 break;
696 }
697 mutex_unlock(&lp_mutex);
698
699 return ret;
700}
701
702#ifdef CONFIG_COMPAT
703static long lp_compat_ioctl(struct file *file, unsigned int cmd,
704 unsigned long arg)
705{
706 unsigned int minor;
707 struct timeval par_timeout;
708 int ret;
709
710 minor = iminor(file->f_path.dentry->d_inode);
711 mutex_lock(&lp_mutex);
712 switch (cmd) {
713 case LPSETTIMEOUT:
714 if (compat_get_timeval(&par_timeout, compat_ptr(arg))) {
715 ret = -EFAULT;
716 break;
717 }
718 ret = lp_set_timeout(minor, &par_timeout);
719 break;
720#ifdef LP_STATS
721 case LPGETSTATS:
722 /* FIXME: add an implementation if you set LP_STATS */
723 ret = -EINVAL;
724 break;
725#endif
726 default:
727 ret = lp_do_ioctl(minor, cmd, arg, compat_ptr(arg));
728 break;
729 }
730 mutex_unlock(&lp_mutex);
731
732 return ret;
733}
734#endif
735
736static const struct file_operations lp_fops = {
737 .owner = THIS_MODULE,
738 .write = lp_write,
739 .unlocked_ioctl = lp_ioctl,
740#ifdef CONFIG_COMPAT
741 .compat_ioctl = lp_compat_ioctl,
742#endif
743 .open = lp_open,
744 .release = lp_release,
745#ifdef CONFIG_PARPORT_1284
746 .read = lp_read,
747#endif
748 .llseek = noop_llseek,
749};
750
751/* --- support for console on the line printer ----------------- */
752
753#ifdef CONFIG_LP_CONSOLE
754
755#define CONSOLE_LP 0
756
757/* If the printer is out of paper, we can either lose the messages or
758 * stall until the printer is happy again. Define CONSOLE_LP_STRICT
759 * non-zero to get the latter behaviour. */
760#define CONSOLE_LP_STRICT 1
761
762/* The console must be locked when we get here. */
763
764static void lp_console_write (struct console *co, const char *s,
765 unsigned count)
766{
767 struct pardevice *dev = lp_table[CONSOLE_LP].dev;
768 struct parport *port = dev->port;
769 ssize_t written;
770
771 if (parport_claim (dev))
772 /* Nothing we can do. */
773 return;
774
775 parport_set_timeout (dev, 0);
776
777 /* Go to compatibility mode. */
778 parport_negotiate (port, IEEE1284_MODE_COMPAT);
779
780 do {
781 /* Write the data, converting LF->CRLF as we go. */
782 ssize_t canwrite = count;
783 char *lf = memchr (s, '\n', count);
784 if (lf)
785 canwrite = lf - s;
786
787 if (canwrite > 0) {
788 written = parport_write (port, s, canwrite);
789
790 if (written <= 0)
791 continue;
792
793 s += written;
794 count -= written;
795 canwrite -= written;
796 }
797
798 if (lf && canwrite <= 0) {
799 const char *crlf = "\r\n";
800 int i = 2;
801
802 /* Dodge the original '\n', and put '\r\n' instead. */
803 s++;
804 count--;
805 do {
806 written = parport_write (port, crlf, i);
807 if (written > 0)
808 i -= written, crlf += written;
809 } while (i > 0 && (CONSOLE_LP_STRICT || written > 0));
810 }
811 } while (count > 0 && (CONSOLE_LP_STRICT || written > 0));
812
813 parport_release (dev);
814}
815
816static struct console lpcons = {
817 .name = "lp",
818 .write = lp_console_write,
819 .flags = CON_PRINTBUFFER,
820};
821
822#endif /* console on line printer */
823
824/* --- initialisation code ------------------------------------- */
825
826static int parport_nr[LP_NO] = { [0 ... LP_NO-1] = LP_PARPORT_UNSPEC };
827static char *parport[LP_NO];
828static bool reset;
829
830module_param_array(parport, charp, NULL, 0);
831module_param(reset, bool, 0);
832
833#ifndef MODULE
834static int __init lp_setup (char *str)
835{
836 static int parport_ptr;
837 int x;
838
839 if (get_option(&str, &x)) {
840 if (x == 0) {
841 /* disable driver on "lp=" or "lp=0" */
842 parport_nr[0] = LP_PARPORT_OFF;
843 } else {
844 printk(KERN_WARNING "warning: 'lp=0x%x' is deprecated, ignored\n", x);
845 return 0;
846 }
847 } else if (!strncmp(str, "parport", 7)) {
848 int n = simple_strtoul(str+7, NULL, 10);
849 if (parport_ptr < LP_NO)
850 parport_nr[parport_ptr++] = n;
851 else
852 printk(KERN_INFO "lp: too many ports, %s ignored.\n",
853 str);
854 } else if (!strcmp(str, "auto")) {
855 parport_nr[0] = LP_PARPORT_AUTO;
856 } else if (!strcmp(str, "none")) {
857 parport_nr[parport_ptr++] = LP_PARPORT_NONE;
858 } else if (!strcmp(str, "reset")) {
859 reset = 1;
860 }
861 return 1;
862}
863#endif
864
865static int lp_register(int nr, struct parport *port)
866{
867 lp_table[nr].dev = parport_register_device(port, "lp",
868 lp_preempt, NULL, NULL, 0,
869 (void *) &lp_table[nr]);
870 if (lp_table[nr].dev == NULL)
871 return 1;
872 lp_table[nr].flags |= LP_EXIST;
873
874 if (reset)
875 lp_reset(nr);
876
877 device_create(lp_class, port->dev, MKDEV(LP_MAJOR, nr), NULL,
878 "lp%d", nr);
879
880 printk(KERN_INFO "lp%d: using %s (%s).\n", nr, port->name,
881 (port->irq == PARPORT_IRQ_NONE)?"polling":"interrupt-driven");
882
883#ifdef CONFIG_LP_CONSOLE
884 if (!nr) {
885 if (port->modes & PARPORT_MODE_SAFEININT) {
886 register_console(&lpcons);
887 console_registered = port;
888 printk (KERN_INFO "lp%d: console ready\n", CONSOLE_LP);
889 } else
890 printk (KERN_ERR "lp%d: cannot run console on %s\n",
891 CONSOLE_LP, port->name);
892 }
893#endif
894
895 return 0;
896}
897
898static void lp_attach (struct parport *port)
899{
900 unsigned int i;
901
902 switch (parport_nr[0]) {
903 case LP_PARPORT_UNSPEC:
904 case LP_PARPORT_AUTO:
905 if (parport_nr[0] == LP_PARPORT_AUTO &&
906 port->probe_info[0].class != PARPORT_CLASS_PRINTER)
907 return;
908 if (lp_count == LP_NO) {
909 printk(KERN_INFO "lp: ignoring parallel port (max. %d)\n",LP_NO);
910 return;
911 }
912 if (!lp_register(lp_count, port))
913 lp_count++;
914 break;
915
916 default:
917 for (i = 0; i < LP_NO; i++) {
918 if (port->number == parport_nr[i]) {
919 if (!lp_register(i, port))
920 lp_count++;
921 break;
922 }
923 }
924 break;
925 }
926}
927
928static void lp_detach (struct parport *port)
929{
930 /* Write this some day. */
931#ifdef CONFIG_LP_CONSOLE
932 if (console_registered == port) {
933 unregister_console(&lpcons);
934 console_registered = NULL;
935 }
936#endif /* CONFIG_LP_CONSOLE */
937}
938
939static struct parport_driver lp_driver = {
940 .name = "lp",
941 .attach = lp_attach,
942 .detach = lp_detach,
943};
944
945static int __init lp_init (void)
946{
947 int i, err = 0;
948
949 if (parport_nr[0] == LP_PARPORT_OFF)
950 return 0;
951
952 for (i = 0; i < LP_NO; i++) {
953 lp_table[i].dev = NULL;
954 lp_table[i].flags = 0;
955 lp_table[i].chars = LP_INIT_CHAR;
956 lp_table[i].time = LP_INIT_TIME;
957 lp_table[i].wait = LP_INIT_WAIT;
958 lp_table[i].lp_buffer = NULL;
959#ifdef LP_STATS
960 lp_table[i].lastcall = 0;
961 lp_table[i].runchars = 0;
962 memset (&lp_table[i].stats, 0, sizeof (struct lp_stats));
963#endif
964 lp_table[i].last_error = 0;
965 init_waitqueue_head (&lp_table[i].waitq);
966 init_waitqueue_head (&lp_table[i].dataq);
967 mutex_init(&lp_table[i].port_mutex);
968 lp_table[i].timeout = 10 * HZ;
969 }
970
971 if (register_chrdev (LP_MAJOR, "lp", &lp_fops)) {
972 printk (KERN_ERR "lp: unable to get major %d\n", LP_MAJOR);
973 return -EIO;
974 }
975
976 lp_class = class_create(THIS_MODULE, "printer");
977 if (IS_ERR(lp_class)) {
978 err = PTR_ERR(lp_class);
979 goto out_reg;
980 }
981
982 if (parport_register_driver (&lp_driver)) {
983 printk (KERN_ERR "lp: unable to register with parport\n");
984 err = -EIO;
985 goto out_class;
986 }
987
988 if (!lp_count) {
989 printk (KERN_INFO "lp: driver loaded but no devices found\n");
990#ifndef CONFIG_PARPORT_1284
991 if (parport_nr[0] == LP_PARPORT_AUTO)
992 printk (KERN_INFO "lp: (is IEEE 1284 support enabled?)\n");
993#endif
994 }
995
996 return 0;
997
998out_class:
999 class_destroy(lp_class);
1000out_reg:
1001 unregister_chrdev(LP_MAJOR, "lp");
1002 return err;
1003}
1004
1005static int __init lp_init_module (void)
1006{
1007 if (parport[0]) {
1008 /* The user gave some parameters. Let's see what they were. */
1009 if (!strncmp(parport[0], "auto", 4))
1010 parport_nr[0] = LP_PARPORT_AUTO;
1011 else {
1012 int n;
1013 for (n = 0; n < LP_NO && parport[n]; n++) {
1014 if (!strncmp(parport[n], "none", 4))
1015 parport_nr[n] = LP_PARPORT_NONE;
1016 else {
1017 char *ep;
1018 unsigned long r = simple_strtoul(parport[n], &ep, 0);
1019 if (ep != parport[n])
1020 parport_nr[n] = r;
1021 else {
1022 printk(KERN_ERR "lp: bad port specifier `%s'\n", parport[n]);
1023 return -ENODEV;
1024 }
1025 }
1026 }
1027 }
1028 }
1029
1030 return lp_init();
1031}
1032
1033static void lp_cleanup_module (void)
1034{
1035 unsigned int offset;
1036
1037 parport_unregister_driver (&lp_driver);
1038
1039#ifdef CONFIG_LP_CONSOLE
1040 unregister_console (&lpcons);
1041#endif
1042
1043 unregister_chrdev(LP_MAJOR, "lp");
1044 for (offset = 0; offset < LP_NO; offset++) {
1045 if (lp_table[offset].dev == NULL)
1046 continue;
1047 parport_unregister_device(lp_table[offset].dev);
1048 device_destroy(lp_class, MKDEV(LP_MAJOR, offset));
1049 }
1050 class_destroy(lp_class);
1051}
1052
1053__setup("lp=", lp_setup);
1054module_init(lp_init_module);
1055module_exit(lp_cleanup_module);
1056
1057MODULE_ALIAS_CHARDEV_MAJOR(LP_MAJOR);
1058MODULE_LICENSE("GPL");