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[linux.git] / drivers / char / lp.c
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1da177e4
LT		 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, [email protected]
11 * Statistics and support for slow printers by Rob Janssen, [email protected]
12 * "lp=" command line parameters added by Grant Guenther, [email protected]
13 * lp_read (Status readback) support added by Carsten Gross,
14 * [email protected]
15 * Support for parport by Philip Blundell <[email protected]>
16 * Parport sharing hacking by Andrea Arcangeli
17 * Fixed kernel_(to/from)_user memory copy to check for errors
18 * by Riccardo Facchetti <[email protected]>
19 * 22-JAN-1998 Added support for devfs Richard Gooch <[email protected]>
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/config.h>
118#include <linux/errno.h>
119#include <linux/kernel.h>
120#include <linux/major.h>
121#include <linux/sched.h>
122#include <linux/smp_lock.h>
123#include <linux/devfs_fs_kernel.h>
124#include <linux/slab.h>
125#include <linux/fcntl.h>
126#include <linux/delay.h>
127#include <linux/poll.h>
128#include <linux/console.h>
129#include <linux/device.h>
130#include <linux/wait.h>
96757701 131#include <linux/jiffies.h>
1da177e4
LT		 132
133#include <linux/parport.h>
134#undef LP_STATS
135#include <linux/lp.h>
136
137#include <asm/irq.h>
138#include <asm/uaccess.h>
139#include <asm/system.h>
140
141/* if you have more than 8 printers, remember to increase LP_NO */
142#define LP_NO 8
143
144/* ROUND_UP macro from fs/select.c */
145#define ROUND_UP(x,y) (((x)+(y)-1)/(y))
146
147static struct lp_struct lp_table[LP_NO];
148
149static unsigned int lp_count = 0;
ca8eca68 150static struct class *lp_class;
1da177e4
LT		 151
152#ifdef CONFIG_LP_CONSOLE
153static struct parport *console_registered; // initially NULL
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) lp_release_parport (&lp_table[minor]);
231 prepare_to_wait(&lp_table[minor].waitq, &wait, TASK_INTERRUPTIBLE);
232 schedule_timeout(LP_TIMEOUT_POLLED);
233 finish_wait(&lp_table[minor].waitq, &wait);
234 if (polling) lp_claim_parport_or_block (&lp_table[minor]);
235 else 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->f_dentry->d_inode);
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
96757701 311 if (time_after(jiffies, lp_table[minor].lastcall + LP_TIME(minor)))
1da177e4
LT		 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 (down_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 up (&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->f_dentry->d_inode);
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 (down_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 up (&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
499 if (minor >= LP_NO)
500 return -ENXIO;
501 if ((LP_F(minor) & LP_EXIST) == 0)
502 return -ENXIO;
503 if (test_and_set_bit(LP_BUSY_BIT_POS, &LP_F(minor)))
504 return -EBUSY;
505
506 /* If ABORTOPEN is set and the printer is offline or out of paper,
507 we may still want to open it to perform ioctl()s. Therefore we
508 have commandeered O_NONBLOCK, even though it is being used in
509 a non-standard manner. This is strictly a Linux hack, and
510 should most likely only ever be used by the tunelp application. */
511 if ((LP_F(minor) & LP_ABORTOPEN) && !(file->f_flags & O_NONBLOCK)) {
512 int status;
513 lp_claim_parport_or_block (&lp_table[minor]);
514 status = r_str(minor);
515 lp_release_parport (&lp_table[minor]);
516 if (status & LP_POUTPA) {
517 printk(KERN_INFO "lp%d out of paper\n", minor);
518 LP_F(minor) &= ~LP_BUSY;
519 return -ENOSPC;
520 } else if (!(status & LP_PSELECD)) {
521 printk(KERN_INFO "lp%d off-line\n", minor);
522 LP_F(minor) &= ~LP_BUSY;
523 return -EIO;
524 } else if (!(status & LP_PERRORP)) {
525 printk(KERN_ERR "lp%d printer error\n", minor);
526 LP_F(minor) &= ~LP_BUSY;
527 return -EIO;
528 }
529 }
530 lp_table[minor].lp_buffer = (char *) kmalloc(LP_BUFFER_SIZE, GFP_KERNEL);
531 if (!lp_table[minor].lp_buffer) {
532 LP_F(minor) &= ~LP_BUSY;
533 return -ENOMEM;
534 }
535 /* Determine if the peripheral supports ECP mode */
536 lp_claim_parport_or_block (&lp_table[minor]);
537 if ( (lp_table[minor].dev->port->modes & PARPORT_MODE_ECP) &&
538 !parport_negotiate (lp_table[minor].dev->port,
539 IEEE1284_MODE_ECP)) {
540 printk (KERN_INFO "lp%d: ECP mode\n", minor);
541 lp_table[minor].best_mode = IEEE1284_MODE_ECP;
542 } else {
543 lp_table[minor].best_mode = IEEE1284_MODE_COMPAT;
544 }
545 /* Leave peripheral in compatibility mode */
546 parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
547 lp_release_parport (&lp_table[minor]);
548 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
549 return 0;
550}
551
552static int lp_release(struct inode * inode, struct file * file)
553{
554 unsigned int minor = iminor(inode);
555
556 lp_claim_parport_or_block (&lp_table[minor]);
557 parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
558 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
559 lp_release_parport (&lp_table[minor]);
560 kfree(lp_table[minor].lp_buffer);
561 lp_table[minor].lp_buffer = NULL;
562 LP_F(minor) &= ~LP_BUSY;
563 return 0;
564}
565
566static int lp_ioctl(struct inode *inode, struct file *file,
567 unsigned int cmd, unsigned long arg)
568{
569 unsigned int minor = iminor(inode);
570 int status;
571 int retval = 0;
572 void __user *argp = (void __user *)arg;
573
574#ifdef LP_DEBUG
575 printk(KERN_DEBUG "lp%d ioctl, cmd: 0x%x, arg: 0x%lx\n", minor, cmd, arg);
576#endif
577 if (minor >= LP_NO)
578 return -ENODEV;
579 if ((LP_F(minor) & LP_EXIST) == 0)
580 return -ENODEV;
581 switch ( cmd ) {
582 struct timeval par_timeout;
583 long to_jiffies;
584
585 case LPTIME:
586 LP_TIME(minor) = arg * HZ/100;
587 break;
588 case LPCHAR:
589 LP_CHAR(minor) = arg;
590 break;
591 case LPABORT:
592 if (arg)
593 LP_F(minor) |= LP_ABORT;
594 else
595 LP_F(minor) &= ~LP_ABORT;
596 break;
597 case LPABORTOPEN:
598 if (arg)
599 LP_F(minor) |= LP_ABORTOPEN;
600 else
601 LP_F(minor) &= ~LP_ABORTOPEN;
602 break;
603 case LPCAREFUL:
604 if (arg)
605 LP_F(minor) |= LP_CAREFUL;
606 else
607 LP_F(minor) &= ~LP_CAREFUL;
608 break;
609 case LPWAIT:
610 LP_WAIT(minor) = arg;
611 break;
612 case LPSETIRQ:
613 return -EINVAL;
614 break;
615 case LPGETIRQ:
616 if (copy_to_user(argp, &LP_IRQ(minor),
617 sizeof(int)))
618 return -EFAULT;
619 break;
620 case LPGETSTATUS:
621 lp_claim_parport_or_block (&lp_table[minor]);
622 status = r_str(minor);
623 lp_release_parport (&lp_table[minor]);
624
625 if (copy_to_user(argp, &status, sizeof(int)))
626 return -EFAULT;
627 break;
628 case LPRESET:
629 lp_reset(minor);
630 break;
631#ifdef LP_STATS
632 case LPGETSTATS:
633 if (copy_to_user(argp, &LP_STAT(minor),
634 sizeof(struct lp_stats)))
635 return -EFAULT;
636 if (capable(CAP_SYS_ADMIN))
637 memset(&LP_STAT(minor), 0,
638 sizeof(struct lp_stats));
639 break;
640#endif
641 case LPGETFLAGS:
642 status = LP_F(minor);
643 if (copy_to_user(argp, &status, sizeof(int)))
644 return -EFAULT;
645 break;
646
647 case LPSETTIMEOUT:
648 if (copy_from_user (&par_timeout, argp,
649 sizeof (struct timeval))) {
650 return -EFAULT;
651 }
652 /* Convert to jiffies, place in lp_table */
653 if ((par_timeout.tv_sec < 0) ||
654 (par_timeout.tv_usec < 0)) {
655 return -EINVAL;
656 }
657 to_jiffies = ROUND_UP(par_timeout.tv_usec, 1000000/HZ);
658 to_jiffies += par_timeout.tv_sec * (long) HZ;
659 if (to_jiffies <= 0) {
660 return -EINVAL;
661 }
662 lp_table[minor].timeout = to_jiffies;
663 break;
664
665 default:
666 retval = -EINVAL;
667 }
668 return retval;
669}
670
671static struct file_operations lp_fops = {
672 .owner = THIS_MODULE,
673 .write = lp_write,
674 .ioctl = lp_ioctl,
675 .open = lp_open,
676 .release = lp_release,
677#ifdef CONFIG_PARPORT_1284
678 .read = lp_read,
679#endif
680};
681
682/* --- support for console on the line printer ----------------- */
683
684#ifdef CONFIG_LP_CONSOLE
685
686#define CONSOLE_LP 0
687
688/* If the printer is out of paper, we can either lose the messages or
689 * stall until the printer is happy again. Define CONSOLE_LP_STRICT
690 * non-zero to get the latter behaviour. */
691#define CONSOLE_LP_STRICT 1
692
693/* The console must be locked when we get here. */
694
695static void lp_console_write (struct console *co, const char *s,
696 unsigned count)
697{
698 struct pardevice *dev = lp_table[CONSOLE_LP].dev;
699 struct parport *port = dev->port;
700 ssize_t written;
701
702 if (parport_claim (dev))
703 /* Nothing we can do. */
704 return;
705
706 parport_set_timeout (dev, 0);
707
708 /* Go to compatibility mode. */
709 parport_negotiate (port, IEEE1284_MODE_COMPAT);
710
711 do {
712 /* Write the data, converting LF->CRLF as we go. */
713 ssize_t canwrite = count;
714 char *lf = memchr (s, '\n', count);
715 if (lf)
716 canwrite = lf - s;
717
718 if (canwrite > 0) {
719 written = parport_write (port, s, canwrite);
720
721 if (written <= 0)
722 continue;
723
724 s += written;
725 count -= written;
726 canwrite -= written;
727 }
728
729 if (lf && canwrite <= 0) {
730 const char *crlf = "\r\n";
731 int i = 2;
732
733 /* Dodge the original '\n', and put '\r\n' instead. */
734 s++;
735 count--;
736 do {
737 written = parport_write (port, crlf, i);
738 if (written > 0)
739 i -= written, crlf += written;
740 } while (i > 0 && (CONSOLE_LP_STRICT || written > 0));
741 }
742 } while (count > 0 && (CONSOLE_LP_STRICT || written > 0));
743
744 parport_release (dev);
745}
746
747static struct console lpcons = {
748 .name = "lp",
749 .write = lp_console_write,
750 .flags = CON_PRINTBUFFER,
751};
752
753#endif /* console on line printer */
754
755/* --- initialisation code ------------------------------------- */
756
757static int parport_nr[LP_NO] = { [0 ... LP_NO-1] = LP_PARPORT_UNSPEC };
758static char *parport[LP_NO] = { NULL, };
759static int reset = 0;
760
761module_param_array(parport, charp, NULL, 0);
762module_param(reset, bool, 0);
763
764#ifndef MODULE
765static int __init lp_setup (char *str)
766{
767 static int parport_ptr; // initially zero
768 int x;
769
770 if (get_option (&str, &x)) {
771 if (x == 0) {
772 /* disable driver on "lp=" or "lp=0" */
773 parport_nr[0] = LP_PARPORT_OFF;
774 } else {
775 printk(KERN_WARNING "warning: 'lp=0x%x' is deprecated, ignored\n", x);
776 return 0;
777 }
778 } else if (!strncmp(str, "parport", 7)) {
779 int n = simple_strtoul(str+7, NULL, 10);
780 if (parport_ptr < LP_NO)
781 parport_nr[parport_ptr++] = n;
782 else
783 printk(KERN_INFO "lp: too many ports, %s ignored.\n",
784 str);
785 } else if (!strcmp(str, "auto")) {
786 parport_nr[0] = LP_PARPORT_AUTO;
787 } else if (!strcmp(str, "none")) {
788 parport_nr[parport_ptr++] = LP_PARPORT_NONE;
789 } else if (!strcmp(str, "reset")) {
790 reset = 1;
791 }
792 return 1;
793}
794#endif
795
796static int lp_register(int nr, struct parport *port)
797{
798 lp_table[nr].dev = parport_register_device(port, "lp",
799 lp_preempt, NULL, NULL, 0,
800 (void *) &lp_table[nr]);
801 if (lp_table[nr].dev == NULL)
802 return 1;
803 lp_table[nr].flags |= LP_EXIST;
804
805 if (reset)
806 lp_reset(nr);
807
53f46542 808 class_device_create(lp_class, NULL, MKDEV(LP_MAJOR, nr), NULL,
1da177e4
LT		 809 "lp%d", nr);
810 devfs_mk_cdev(MKDEV(LP_MAJOR, nr), S_IFCHR | S_IRUGO | S_IWUGO,
811 "printers/%d", nr);
812
813 printk(KERN_INFO "lp%d: using %s (%s).\n", nr, port->name,
814 (port->irq == PARPORT_IRQ_NONE)?"polling":"interrupt-driven");
815
816#ifdef CONFIG_LP_CONSOLE
817 if (!nr) {
818 if (port->modes & PARPORT_MODE_SAFEININT) {
819 register_console (&lpcons);
820 console_registered = port;
821 printk (KERN_INFO "lp%d: console ready\n", CONSOLE_LP);
822 } else
823 printk (KERN_ERR "lp%d: cannot run console on %s\n",
824 CONSOLE_LP, port->name);
825 }
826#endif
827
828 return 0;
829}
830
831static void lp_attach (struct parport *port)
832{
833 unsigned int i;
834
835 switch (parport_nr[0])
836 {
837 case LP_PARPORT_UNSPEC:
838 case LP_PARPORT_AUTO:
839 if (parport_nr[0] == LP_PARPORT_AUTO &&
840 port->probe_info[0].class != PARPORT_CLASS_PRINTER)
841 return;
842 if (lp_count == LP_NO) {
843 printk(KERN_INFO "lp: ignoring parallel port (max. %d)\n",LP_NO);
844 return;
845 }
846 if (!lp_register(lp_count, port))
847 lp_count++;
848 break;
849
850 default:
851 for (i = 0; i < LP_NO; i++) {
852 if (port->number == parport_nr[i]) {
853 if (!lp_register(i, port))
854 lp_count++;
855 break;
856 }
857 }
858 break;
859 }
860}
861
862static void lp_detach (struct parport *port)
863{
864 /* Write this some day. */
865#ifdef CONFIG_LP_CONSOLE
866 if (console_registered == port) {
867 unregister_console (&lpcons);
868 console_registered = NULL;
869 }
870#endif /* CONFIG_LP_CONSOLE */
871}
872
873static struct parport_driver lp_driver = {
874 .name = "lp",
875 .attach = lp_attach,
876 .detach = lp_detach,
877};
878
879static int __init lp_init (void)
880{
881 int i, err = 0;
882
883 if (parport_nr[0] == LP_PARPORT_OFF)
884 return 0;
885
886 for (i = 0; i < LP_NO; i++) {
887 lp_table[i].dev = NULL;
888 lp_table[i].flags = 0;
889 lp_table[i].chars = LP_INIT_CHAR;
890 lp_table[i].time = LP_INIT_TIME;
891 lp_table[i].wait = LP_INIT_WAIT;
892 lp_table[i].lp_buffer = NULL;
893#ifdef LP_STATS
894 lp_table[i].lastcall = 0;
895 lp_table[i].runchars = 0;
896 memset (&lp_table[i].stats, 0, sizeof (struct lp_stats));
897#endif
898 lp_table[i].last_error = 0;
899 init_waitqueue_head (&lp_table[i].waitq);
900 init_waitqueue_head (&lp_table[i].dataq);
901 init_MUTEX (&lp_table[i].port_mutex);
902 lp_table[i].timeout = 10 * HZ;
903 }
904
905 if (register_chrdev (LP_MAJOR, "lp", &lp_fops)) {
906 printk (KERN_ERR "lp: unable to get major %d\n", LP_MAJOR);
907 return -EIO;
908 }
909
910 devfs_mk_dir("printers");
ca8eca68 911 lp_class = class_create(THIS_MODULE, "printer");
1da177e4
LT		 912 if (IS_ERR(lp_class)) {
913 err = PTR_ERR(lp_class);
914 goto out_devfs;
915 }
916
917 if (parport_register_driver (&lp_driver)) {
918 printk (KERN_ERR "lp: unable to register with parport\n");
919 err = -EIO;
920 goto out_class;
921 }
922
923 if (!lp_count) {
924 printk (KERN_INFO "lp: driver loaded but no devices found\n");
925#ifndef CONFIG_PARPORT_1284
926 if (parport_nr[0] == LP_PARPORT_AUTO)
927 printk (KERN_INFO "lp: (is IEEE 1284 support enabled?)\n");
928#endif
929 }
930
931 return 0;
932
933out_class:
ca8eca68 934 class_destroy(lp_class);
1da177e4
LT		 935out_devfs:
936 devfs_remove("printers");
937 unregister_chrdev(LP_MAJOR, "lp");
938 return err;
939}
940
941static int __init lp_init_module (void)
942{
943 if (parport[0]) {
944 /* The user gave some parameters. Let's see what they were. */
945 if (!strncmp(parport[0], "auto", 4))
946 parport_nr[0] = LP_PARPORT_AUTO;
947 else {
948 int n;
949 for (n = 0; n < LP_NO && parport[n]; n++) {
950 if (!strncmp(parport[n], "none", 4))
951 parport_nr[n] = LP_PARPORT_NONE;
952 else {
953 char *ep;
954 unsigned long r = simple_strtoul(parport[n], &ep, 0);
955 if (ep != parport[n])
956 parport_nr[n] = r;
957 else {
958 printk(KERN_ERR "lp: bad port specifier `%s'\n", parport[n]);
959 return -ENODEV;
960 }
961 }
962 }
963 }
964 }
965
966 return lp_init();
967}
968
969static void lp_cleanup_module (void)
970{
971 unsigned int offset;
972
973 parport_unregister_driver (&lp_driver);
974
975#ifdef CONFIG_LP_CONSOLE
976 unregister_console (&lpcons);
977#endif
978
979 unregister_chrdev(LP_MAJOR, "lp");
980 for (offset = 0; offset < LP_NO; offset++) {
981 if (lp_table[offset].dev == NULL)
982 continue;
983 parport_unregister_device(lp_table[offset].dev);
984 devfs_remove("printers/%d", offset);
ca8eca68 985 class_device_destroy(lp_class, MKDEV(LP_MAJOR, offset));
1da177e4
LT		 986 }
987 devfs_remove("printers");
ca8eca68 988 class_destroy(lp_class);
1da177e4
LT		 989}
990
991__setup("lp=", lp_setup);
992module_init(lp_init_module);
993module_exit(lp_cleanup_module);
994
995MODULE_ALIAS_CHARDEV_MAJOR(LP_MAJOR);
996MODULE_LICENSE("GPL");
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