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-rw-r--r--drivers/char/lp.c995
1 files changed, 995 insertions, 0 deletions
diff --git a/drivers/char/lp.c b/drivers/char/lp.c
new file mode 100644
index 000000000000..4dee945031d4
--- /dev/null
+++ b/drivers/char/lp.c
@@ -0,0 +1,995 @@
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/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>
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
143/* ROUND_UP macro from fs/select.c */
144#define ROUND_UP(x,y) (((x)+(y)-1)/(y))
145
146static struct lp_struct lp_table[LP_NO];
147
148static unsigned int lp_count = 0;
149static struct class_simple *lp_class;
150
151#ifdef CONFIG_LP_CONSOLE
152static struct parport *console_registered; // initially NULL
153#endif /* CONFIG_LP_CONSOLE */
154
155#undef LP_DEBUG
156
157/* Bits used to manage claiming the parport device */
158#define LP_PREEMPT_REQUEST 1
159#define LP_PARPORT_CLAIMED 2
160
161/* --- low-level port access ----------------------------------- */
162
163#define r_dtr(x) (parport_read_data(lp_table[(x)].dev->port))
164#define r_str(x) (parport_read_status(lp_table[(x)].dev->port))
165#define w_ctr(x,y) do { parport_write_control(lp_table[(x)].dev->port, (y)); } while (0)
166#define w_dtr(x,y) do { parport_write_data(lp_table[(x)].dev->port, (y)); } while (0)
167
168/* Claim the parport or block trying unless we've already claimed it */
169static void lp_claim_parport_or_block(struct lp_struct *this_lp)
170{
171 if (!test_and_set_bit(LP_PARPORT_CLAIMED, &this_lp->bits)) {
172 parport_claim_or_block (this_lp->dev);
173 }
174}
175
176/* Claim the parport or block trying unless we've already claimed it */
177static void lp_release_parport(struct lp_struct *this_lp)
178{
179 if (test_and_clear_bit(LP_PARPORT_CLAIMED, &this_lp->bits)) {
180 parport_release (this_lp->dev);
181 }
182}
183
184
185
186static int lp_preempt(void *handle)
187{
188 struct lp_struct *this_lp = (struct lp_struct *)handle;
189 set_bit(LP_PREEMPT_REQUEST, &this_lp->bits);
190 return (1);
191}
192
193
194/*
195 * Try to negotiate to a new mode; if unsuccessful negotiate to
196 * compatibility mode. Return the mode we ended up in.
197 */
198static int lp_negotiate(struct parport * port, int mode)
199{
200 if (parport_negotiate (port, mode) != 0) {
201 mode = IEEE1284_MODE_COMPAT;
202 parport_negotiate (port, mode);
203 }
204
205 return (mode);
206}
207
208static int lp_reset(int minor)
209{
210 int retval;
211 lp_claim_parport_or_block (&lp_table[minor]);
212 w_ctr(minor, LP_PSELECP);
213 udelay (LP_DELAY);
214 w_ctr(minor, LP_PSELECP | LP_PINITP);
215 retval = r_str(minor);
216 lp_release_parport (&lp_table[minor]);
217 return retval;
218}
219
220static void lp_error (int minor)
221{
222 DEFINE_WAIT(wait);
223 int polling;
224
225 if (LP_F(minor) & LP_ABORT)
226 return;
227
228 polling = lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE;
229 if (polling) lp_release_parport (&lp_table[minor]);
230 prepare_to_wait(&lp_table[minor].waitq, &wait, TASK_INTERRUPTIBLE);
231 schedule_timeout(LP_TIMEOUT_POLLED);
232 finish_wait(&lp_table[minor].waitq, &wait);
233 if (polling) lp_claim_parport_or_block (&lp_table[minor]);
234 else parport_yield_blocking (lp_table[minor].dev);
235}
236
237static int lp_check_status(int minor)
238{
239 int error = 0;
240 unsigned int last = lp_table[minor].last_error;
241 unsigned char status = r_str(minor);
242 if ((status & LP_PERRORP) && !(LP_F(minor) & LP_CAREFUL))
243 /* No error. */
244 last = 0;
245 else if ((status & LP_POUTPA)) {
246 if (last != LP_POUTPA) {
247 last = LP_POUTPA;
248 printk(KERN_INFO "lp%d out of paper\n", minor);
249 }
250 error = -ENOSPC;
251 } else if (!(status & LP_PSELECD)) {
252 if (last != LP_PSELECD) {
253 last = LP_PSELECD;
254 printk(KERN_INFO "lp%d off-line\n", minor);
255 }
256 error = -EIO;
257 } else if (!(status & LP_PERRORP)) {
258 if (last != LP_PERRORP) {
259 last = LP_PERRORP;
260 printk(KERN_INFO "lp%d on fire\n", minor);
261 }
262 error = -EIO;
263 } else {
264 last = 0; /* Come here if LP_CAREFUL is set and no
265 errors are reported. */
266 }
267
268 lp_table[minor].last_error = last;
269
270 if (last != 0)
271 lp_error(minor);
272
273 return error;
274}
275
276static int lp_wait_ready(int minor, int nonblock)
277{
278 int error = 0;
279
280 /* If we're not in compatibility mode, we're ready now! */
281 if (lp_table[minor].current_mode != IEEE1284_MODE_COMPAT) {
282 return (0);
283 }
284
285 do {
286 error = lp_check_status (minor);
287 if (error && (nonblock || (LP_F(minor) & LP_ABORT)))
288 break;
289 if (signal_pending (current)) {
290 error = -EINTR;
291 break;
292 }
293 } while (error);
294 return error;
295}
296
297static ssize_t lp_write(struct file * file, const char __user * buf,
298 size_t count, loff_t *ppos)
299{
300 unsigned int minor = iminor(file->f_dentry->d_inode);
301 struct parport *port = lp_table[minor].dev->port;
302 char *kbuf = lp_table[minor].lp_buffer;
303 ssize_t retv = 0;
304 ssize_t written;
305 size_t copy_size = count;
306 int nonblock = ((file->f_flags & O_NONBLOCK) ||
307 (LP_F(minor) & LP_ABORT));
308
309#ifdef LP_STATS
310 if (jiffies-lp_table[minor].lastcall > LP_TIME(minor))
311 lp_table[minor].runchars = 0;
312
313 lp_table[minor].lastcall = jiffies;
314#endif
315
316 /* Need to copy the data from user-space. */
317 if (copy_size > LP_BUFFER_SIZE)
318 copy_size = LP_BUFFER_SIZE;
319
320 if (down_interruptible (&lp_table[minor].port_mutex))
321 return -EINTR;
322
323 if (copy_from_user (kbuf, buf, copy_size)) {
324 retv = -EFAULT;
325 goto out_unlock;
326 }
327
328 /* Claim Parport or sleep until it becomes available
329 */
330 lp_claim_parport_or_block (&lp_table[minor]);
331 /* Go to the proper mode. */
332 lp_table[minor].current_mode = lp_negotiate (port,
333 lp_table[minor].best_mode);
334
335 parport_set_timeout (lp_table[minor].dev,
336 (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK
337 : lp_table[minor].timeout));
338
339 if ((retv = lp_wait_ready (minor, nonblock)) == 0)
340 do {
341 /* Write the data. */
342 written = parport_write (port, kbuf, copy_size);
343 if (written > 0) {
344 copy_size -= written;
345 count -= written;
346 buf += written;
347 retv += written;
348 }
349
350 if (signal_pending (current)) {
351 if (retv == 0)
352 retv = -EINTR;
353
354 break;
355 }
356
357 if (copy_size > 0) {
358 /* incomplete write -> check error ! */
359 int error;
360
361 parport_negotiate (lp_table[minor].dev->port,
362 IEEE1284_MODE_COMPAT);
363 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
364
365 error = lp_wait_ready (minor, nonblock);
366
367 if (error) {
368 if (retv == 0)
369 retv = error;
370 break;
371 } else if (nonblock) {
372 if (retv == 0)
373 retv = -EAGAIN;
374 break;
375 }
376
377 parport_yield_blocking (lp_table[minor].dev);
378 lp_table[minor].current_mode
379 = lp_negotiate (port,
380 lp_table[minor].best_mode);
381
382 } else if (need_resched())
383 schedule ();
384
385 if (count) {
386 copy_size = count;
387 if (copy_size > LP_BUFFER_SIZE)
388 copy_size = LP_BUFFER_SIZE;
389
390 if (copy_from_user(kbuf, buf, copy_size)) {
391 if (retv == 0)
392 retv = -EFAULT;
393 break;
394 }
395 }
396 } while (count > 0);
397
398 if (test_and_clear_bit(LP_PREEMPT_REQUEST,
399 &lp_table[minor].bits)) {
400 printk(KERN_INFO "lp%d releasing parport\n", minor);
401 parport_negotiate (lp_table[minor].dev->port,
402 IEEE1284_MODE_COMPAT);
403 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
404 lp_release_parport (&lp_table[minor]);
405 }
406out_unlock:
407 up (&lp_table[minor].port_mutex);
408
409 return retv;
410}
411
412#ifdef CONFIG_PARPORT_1284
413
414/* Status readback conforming to ieee1284 */
415static ssize_t lp_read(struct file * file, char __user * buf,
416 size_t count, loff_t *ppos)
417{
418 DEFINE_WAIT(wait);
419 unsigned int minor=iminor(file->f_dentry->d_inode);
420 struct parport *port = lp_table[minor].dev->port;
421 ssize_t retval = 0;
422 char *kbuf = lp_table[minor].lp_buffer;
423 int nonblock = ((file->f_flags & O_NONBLOCK) ||
424 (LP_F(minor) & LP_ABORT));
425
426 if (count > LP_BUFFER_SIZE)
427 count = LP_BUFFER_SIZE;
428
429 if (down_interruptible (&lp_table[minor].port_mutex))
430 return -EINTR;
431
432 lp_claim_parport_or_block (&lp_table[minor]);
433
434 parport_set_timeout (lp_table[minor].dev,
435 (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK
436 : lp_table[minor].timeout));
437
438 parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
439 if (parport_negotiate (lp_table[minor].dev->port,
440 IEEE1284_MODE_NIBBLE)) {
441 retval = -EIO;
442 goto out;
443 }
444
445 while (retval == 0) {
446 retval = parport_read (port, kbuf, count);
447
448 if (retval > 0)
449 break;
450
451 if (nonblock) {
452 retval = -EAGAIN;
453 break;
454 }
455
456 /* Wait for data. */
457
458 if (lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE) {
459 parport_negotiate (lp_table[minor].dev->port,
460 IEEE1284_MODE_COMPAT);
461 lp_error (minor);
462 if (parport_negotiate (lp_table[minor].dev->port,
463 IEEE1284_MODE_NIBBLE)) {
464 retval = -EIO;
465 goto out;
466 }
467 } else {
468 prepare_to_wait(&lp_table[minor].waitq, &wait, TASK_INTERRUPTIBLE);
469 schedule_timeout(LP_TIMEOUT_POLLED);
470 finish_wait(&lp_table[minor].waitq, &wait);
471 }
472
473 if (signal_pending (current)) {
474 retval = -ERESTARTSYS;
475 break;
476 }
477
478 cond_resched ();
479 }
480 parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
481 out:
482 lp_release_parport (&lp_table[minor]);
483
484 if (retval > 0 && copy_to_user (buf, kbuf, retval))
485 retval = -EFAULT;
486
487 up (&lp_table[minor].port_mutex);
488
489 return retval;
490}
491
492#endif /* IEEE 1284 support */
493
494static int lp_open(struct inode * inode, struct file * file)
495{
496 unsigned int minor = iminor(inode);
497
498 if (minor >= LP_NO)
499 return -ENXIO;
500 if ((LP_F(minor) & LP_EXIST) == 0)
501 return -ENXIO;
502 if (test_and_set_bit(LP_BUSY_BIT_POS, &LP_F(minor)))
503 return -EBUSY;
504
505 /* If ABORTOPEN is set and the printer is offline or out of paper,
506 we may still want to open it to perform ioctl()s. Therefore we
507 have commandeered O_NONBLOCK, even though it is being used in
508 a non-standard manner. This is strictly a Linux hack, and
509 should most likely only ever be used by the tunelp application. */
510 if ((LP_F(minor) & LP_ABORTOPEN) && !(file->f_flags & O_NONBLOCK)) {
511 int status;
512 lp_claim_parport_or_block (&lp_table[minor]);
513 status = r_str(minor);
514 lp_release_parport (&lp_table[minor]);
515 if (status & LP_POUTPA) {
516 printk(KERN_INFO "lp%d out of paper\n", minor);
517 LP_F(minor) &= ~LP_BUSY;
518 return -ENOSPC;
519 } else if (!(status & LP_PSELECD)) {
520 printk(KERN_INFO "lp%d off-line\n", minor);
521 LP_F(minor) &= ~LP_BUSY;
522 return -EIO;
523 } else if (!(status & LP_PERRORP)) {
524 printk(KERN_ERR "lp%d printer error\n", minor);
525 LP_F(minor) &= ~LP_BUSY;
526 return -EIO;
527 }
528 }
529 lp_table[minor].lp_buffer = (char *) kmalloc(LP_BUFFER_SIZE, GFP_KERNEL);
530 if (!lp_table[minor].lp_buffer) {
531 LP_F(minor) &= ~LP_BUSY;
532 return -ENOMEM;
533 }
534 /* Determine if the peripheral supports ECP mode */
535 lp_claim_parport_or_block (&lp_table[minor]);
536 if ( (lp_table[minor].dev->port->modes & PARPORT_MODE_ECP) &&
537 !parport_negotiate (lp_table[minor].dev->port,
538 IEEE1284_MODE_ECP)) {
539 printk (KERN_INFO "lp%d: ECP mode\n", minor);
540 lp_table[minor].best_mode = IEEE1284_MODE_ECP;
541 } else {
542 lp_table[minor].best_mode = IEEE1284_MODE_COMPAT;
543 }
544 /* Leave peripheral in compatibility mode */
545 parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
546 lp_release_parport (&lp_table[minor]);
547 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
548 return 0;
549}
550
551static int lp_release(struct inode * inode, struct file * file)
552{
553 unsigned int minor = iminor(inode);
554
555 lp_claim_parport_or_block (&lp_table[minor]);
556 parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
557 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
558 lp_release_parport (&lp_table[minor]);
559 kfree(lp_table[minor].lp_buffer);
560 lp_table[minor].lp_buffer = NULL;
561 LP_F(minor) &= ~LP_BUSY;
562 return 0;
563}
564
565static int lp_ioctl(struct inode *inode, struct file *file,
566 unsigned int cmd, unsigned long arg)
567{
568 unsigned int minor = iminor(inode);
569 int status;
570 int retval = 0;
571 void __user *argp = (void __user *)arg;
572
573#ifdef LP_DEBUG
574 printk(KERN_DEBUG "lp%d ioctl, cmd: 0x%x, arg: 0x%lx\n", minor, cmd, arg);
575#endif
576 if (minor >= LP_NO)
577 return -ENODEV;
578 if ((LP_F(minor) & LP_EXIST) == 0)
579 return -ENODEV;
580 switch ( cmd ) {
581 struct timeval par_timeout;
582 long to_jiffies;
583
584 case LPTIME:
585 LP_TIME(minor) = arg * HZ/100;
586 break;
587 case LPCHAR:
588 LP_CHAR(minor) = arg;
589 break;
590 case LPABORT:
591 if (arg)
592 LP_F(minor) |= LP_ABORT;
593 else
594 LP_F(minor) &= ~LP_ABORT;
595 break;
596 case LPABORTOPEN:
597 if (arg)
598 LP_F(minor) |= LP_ABORTOPEN;
599 else
600 LP_F(minor) &= ~LP_ABORTOPEN;
601 break;
602 case LPCAREFUL:
603 if (arg)
604 LP_F(minor) |= LP_CAREFUL;
605 else
606 LP_F(minor) &= ~LP_CAREFUL;
607 break;
608 case LPWAIT:
609 LP_WAIT(minor) = arg;
610 break;
611 case LPSETIRQ:
612 return -EINVAL;
613 break;
614 case LPGETIRQ:
615 if (copy_to_user(argp, &LP_IRQ(minor),
616 sizeof(int)))
617 return -EFAULT;
618 break;
619 case LPGETSTATUS:
620 lp_claim_parport_or_block (&lp_table[minor]);
621 status = r_str(minor);
622 lp_release_parport (&lp_table[minor]);
623
624 if (copy_to_user(argp, &status, sizeof(int)))
625 return -EFAULT;
626 break;
627 case LPRESET:
628 lp_reset(minor);
629 break;
630#ifdef LP_STATS
631 case LPGETSTATS:
632 if (copy_to_user(argp, &LP_STAT(minor),
633 sizeof(struct lp_stats)))
634 return -EFAULT;
635 if (capable(CAP_SYS_ADMIN))
636 memset(&LP_STAT(minor), 0,
637 sizeof(struct lp_stats));
638 break;
639#endif
640 case LPGETFLAGS:
641 status = LP_F(minor);
642 if (copy_to_user(argp, &status, sizeof(int)))
643 return -EFAULT;
644 break;
645
646 case LPSETTIMEOUT:
647 if (copy_from_user (&par_timeout, argp,
648 sizeof (struct timeval))) {
649 return -EFAULT;
650 }
651 /* Convert to jiffies, place in lp_table */
652 if ((par_timeout.tv_sec < 0) ||
653 (par_timeout.tv_usec < 0)) {
654 return -EINVAL;
655 }
656 to_jiffies = ROUND_UP(par_timeout.tv_usec, 1000000/HZ);
657 to_jiffies += par_timeout.tv_sec * (long) HZ;
658 if (to_jiffies <= 0) {
659 return -EINVAL;
660 }
661 lp_table[minor].timeout = to_jiffies;
662 break;
663
664 default:
665 retval = -EINVAL;
666 }
667 return retval;
668}
669
670static struct file_operations lp_fops = {
671 .owner = THIS_MODULE,
672 .write = lp_write,
673 .ioctl = lp_ioctl,
674 .open = lp_open,
675 .release = lp_release,
676#ifdef CONFIG_PARPORT_1284
677 .read = lp_read,
678#endif
679};
680
681/* --- support for console on the line printer ----------------- */
682
683#ifdef CONFIG_LP_CONSOLE
684
685#define CONSOLE_LP 0
686
687/* If the printer is out of paper, we can either lose the messages or
688 * stall until the printer is happy again. Define CONSOLE_LP_STRICT
689 * non-zero to get the latter behaviour. */
690#define CONSOLE_LP_STRICT 1
691
692/* The console must be locked when we get here. */
693
694static void lp_console_write (struct console *co, const char *s,
695 unsigned count)
696{
697 struct pardevice *dev = lp_table[CONSOLE_LP].dev;
698 struct parport *port = dev->port;
699 ssize_t written;
700
701 if (parport_claim (dev))
702 /* Nothing we can do. */
703 return;
704
705 parport_set_timeout (dev, 0);
706
707 /* Go to compatibility mode. */
708 parport_negotiate (port, IEEE1284_MODE_COMPAT);
709
710 do {
711 /* Write the data, converting LF->CRLF as we go. */
712 ssize_t canwrite = count;
713 char *lf = memchr (s, '\n', count);
714 if (lf)
715 canwrite = lf - s;
716
717 if (canwrite > 0) {
718 written = parport_write (port, s, canwrite);
719
720 if (written <= 0)
721 continue;
722
723 s += written;
724 count -= written;
725 canwrite -= written;
726 }
727
728 if (lf && canwrite <= 0) {
729 const char *crlf = "\r\n";
730 int i = 2;
731
732 /* Dodge the original '\n', and put '\r\n' instead. */
733 s++;
734 count--;
735 do {
736 written = parport_write (port, crlf, i);
737 if (written > 0)
738 i -= written, crlf += written;
739 } while (i > 0 && (CONSOLE_LP_STRICT || written > 0));
740 }
741 } while (count > 0 && (CONSOLE_LP_STRICT || written > 0));
742
743 parport_release (dev);
744}
745
746static struct console lpcons = {
747 .name = "lp",
748 .write = lp_console_write,
749 .flags = CON_PRINTBUFFER,
750};
751
752#endif /* console on line printer */
753
754/* --- initialisation code ------------------------------------- */
755
756static int parport_nr[LP_NO] = { [0 ... LP_NO-1] = LP_PARPORT_UNSPEC };
757static char *parport[LP_NO] = { NULL, };
758static int reset = 0;
759
760module_param_array(parport, charp, NULL, 0);
761module_param(reset, bool, 0);
762
763#ifndef MODULE
764static int __init lp_setup (char *str)
765{
766 static int parport_ptr; // initially zero
767 int x;
768
769 if (get_option (&str, &x)) {
770 if (x == 0) {
771 /* disable driver on "lp=" or "lp=0" */
772 parport_nr[0] = LP_PARPORT_OFF;
773 } else {
774 printk(KERN_WARNING "warning: 'lp=0x%x' is deprecated, ignored\n", x);
775 return 0;
776 }
777 } else if (!strncmp(str, "parport", 7)) {
778 int n = simple_strtoul(str+7, NULL, 10);
779 if (parport_ptr < LP_NO)
780 parport_nr[parport_ptr++] = n;
781 else
782 printk(KERN_INFO "lp: too many ports, %s ignored.\n",
783 str);
784 } else if (!strcmp(str, "auto")) {
785 parport_nr[0] = LP_PARPORT_AUTO;
786 } else if (!strcmp(str, "none")) {
787 parport_nr[parport_ptr++] = LP_PARPORT_NONE;
788 } else if (!strcmp(str, "reset")) {
789 reset = 1;
790 }
791 return 1;
792}
793#endif
794
795static int lp_register(int nr, struct parport *port)
796{
797 lp_table[nr].dev = parport_register_device(port, "lp",
798 lp_preempt, NULL, NULL, 0,
799 (void *) &lp_table[nr]);
800 if (lp_table[nr].dev == NULL)
801 return 1;
802 lp_table[nr].flags |= LP_EXIST;
803
804 if (reset)
805 lp_reset(nr);
806
807 class_simple_device_add(lp_class, MKDEV(LP_MAJOR, nr), NULL,
808 "lp%d", nr);
809 devfs_mk_cdev(MKDEV(LP_MAJOR, nr), S_IFCHR | S_IRUGO | S_IWUGO,
810 "printers/%d", nr);
811
812 printk(KERN_INFO "lp%d: using %s (%s).\n", nr, port->name,
813 (port->irq == PARPORT_IRQ_NONE)?"polling":"interrupt-driven");
814
815#ifdef CONFIG_LP_CONSOLE
816 if (!nr) {
817 if (port->modes & PARPORT_MODE_SAFEININT) {
818 register_console (&lpcons);
819 console_registered = port;
820 printk (KERN_INFO "lp%d: console ready\n", CONSOLE_LP);
821 } else
822 printk (KERN_ERR "lp%d: cannot run console on %s\n",
823 CONSOLE_LP, port->name);
824 }
825#endif
826
827 return 0;
828}
829
830static void lp_attach (struct parport *port)
831{
832 unsigned int i;
833
834 switch (parport_nr[0])
835 {
836 case LP_PARPORT_UNSPEC:
837 case LP_PARPORT_AUTO:
838 if (parport_nr[0] == LP_PARPORT_AUTO &&
839 port->probe_info[0].class != PARPORT_CLASS_PRINTER)
840 return;
841 if (lp_count == LP_NO) {
842 printk(KERN_INFO "lp: ignoring parallel port (max. %d)\n",LP_NO);
843 return;
844 }
845 if (!lp_register(lp_count, port))
846 lp_count++;
847 break;
848
849 default:
850 for (i = 0; i < LP_NO; i++) {
851 if (port->number == parport_nr[i]) {
852 if (!lp_register(i, port))
853 lp_count++;
854 break;
855 }
856 }
857 break;
858 }
859}
860
861static void lp_detach (struct parport *port)
862{
863 /* Write this some day. */
864#ifdef CONFIG_LP_CONSOLE
865 if (console_registered == port) {
866 unregister_console (&lpcons);
867 console_registered = NULL;
868 }
869#endif /* CONFIG_LP_CONSOLE */
870}
871
872static struct parport_driver lp_driver = {
873 .name = "lp",
874 .attach = lp_attach,
875 .detach = lp_detach,
876};
877
878static int __init lp_init (void)
879{
880 int i, err = 0;
881
882 if (parport_nr[0] == LP_PARPORT_OFF)
883 return 0;
884
885 for (i = 0; i < LP_NO; i++) {
886 lp_table[i].dev = NULL;
887 lp_table[i].flags = 0;
888 lp_table[i].chars = LP_INIT_CHAR;
889 lp_table[i].time = LP_INIT_TIME;
890 lp_table[i].wait = LP_INIT_WAIT;
891 lp_table[i].lp_buffer = NULL;
892#ifdef LP_STATS
893 lp_table[i].lastcall = 0;
894 lp_table[i].runchars = 0;
895 memset (&lp_table[i].stats, 0, sizeof (struct lp_stats));
896#endif
897 lp_table[i].last_error = 0;
898 init_waitqueue_head (&lp_table[i].waitq);
899 init_waitqueue_head (&lp_table[i].dataq);
900 init_MUTEX (&lp_table[i].port_mutex);
901 lp_table[i].timeout = 10 * HZ;
902 }
903
904 if (register_chrdev (LP_MAJOR, "lp", &lp_fops)) {
905 printk (KERN_ERR "lp: unable to get major %d\n", LP_MAJOR);
906 return -EIO;
907 }
908
909 devfs_mk_dir("printers");
910 lp_class = class_simple_create(THIS_MODULE, "printer");
911 if (IS_ERR(lp_class)) {
912 err = PTR_ERR(lp_class);
913 goto out_devfs;
914 }
915
916 if (parport_register_driver (&lp_driver)) {
917 printk (KERN_ERR "lp: unable to register with parport\n");
918 err = -EIO;
919 goto out_class;
920 }
921
922 if (!lp_count) {
923 printk (KERN_INFO "lp: driver loaded but no devices found\n");
924#ifndef CONFIG_PARPORT_1284
925 if (parport_nr[0] == LP_PARPORT_AUTO)
926 printk (KERN_INFO "lp: (is IEEE 1284 support enabled?)\n");
927#endif
928 }
929
930 return 0;
931
932out_class:
933 class_simple_destroy(lp_class);
934out_devfs:
935 devfs_remove("printers");
936 unregister_chrdev(LP_MAJOR, "lp");
937 return err;
938}
939
940static int __init lp_init_module (void)
941{
942 if (parport[0]) {
943 /* The user gave some parameters. Let's see what they were. */
944 if (!strncmp(parport[0], "auto", 4))
945 parport_nr[0] = LP_PARPORT_AUTO;
946 else {
947 int n;
948 for (n = 0; n < LP_NO && parport[n]; n++) {
949 if (!strncmp(parport[n], "none", 4))
950 parport_nr[n] = LP_PARPORT_NONE;
951 else {
952 char *ep;
953 unsigned long r = simple_strtoul(parport[n], &ep, 0);
954 if (ep != parport[n])
955 parport_nr[n] = r;
956 else {
957 printk(KERN_ERR "lp: bad port specifier `%s'\n", parport[n]);
958 return -ENODEV;
959 }
960 }
961 }
962 }
963 }
964
965 return lp_init();
966}
967
968static void lp_cleanup_module (void)
969{
970 unsigned int offset;
971
972 parport_unregister_driver (&lp_driver);
973
974#ifdef CONFIG_LP_CONSOLE
975 unregister_console (&lpcons);
976#endif
977
978 unregister_chrdev(LP_MAJOR, "lp");
979 for (offset = 0; offset < LP_NO; offset++) {
980 if (lp_table[offset].dev == NULL)
981 continue;
982 parport_unregister_device(lp_table[offset].dev);
983 devfs_remove("printers/%d", offset);
984 class_simple_device_remove(MKDEV(LP_MAJOR, offset));
985 }
986 devfs_remove("printers");
987 class_simple_destroy(lp_class);
988}
989
990__setup("lp=", lp_setup);
991module_init(lp_init_module);
992module_exit(lp_cleanup_module);
993
994MODULE_ALIAS_CHARDEV_MAJOR(LP_MAJOR);
995MODULE_LICENSE("GPL");
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-21 21:00:03 -0500