ia64/linux-2.6.18-xen.hg

view drivers/char/lp.c @ 893:f994bfe9b93b

linux/blktap2: reduce TLB flush scope

c/s 885 added very coarse TLB flushing. Since these flushes always
follow single page updates, single page flushes (when available) are
sufficient.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
author Keir Fraser <keir.fraser@citrix.com>
date Thu Jun 04 10:32:57 2009 +0100 (2009-06-04)
parents 831230e53067
children
line source
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 */
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 */
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 */
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 */
114 #include <linux/module.h>
115 #include <linux/init.h>
117 #include <linux/errno.h>
118 #include <linux/kernel.h>
119 #include <linux/major.h>
120 #include <linux/sched.h>
121 #include <linux/smp_lock.h>
122 #include <linux/slab.h>
123 #include <linux/fcntl.h>
124 #include <linux/delay.h>
125 #include <linux/poll.h>
126 #include <linux/console.h>
127 #include <linux/device.h>
128 #include <linux/wait.h>
129 #include <linux/jiffies.h>
131 #include <linux/parport.h>
132 #undef LP_STATS
133 #include <linux/lp.h>
135 #include <asm/irq.h>
136 #include <asm/uaccess.h>
137 #include <asm/system.h>
139 /* if you have more than 8 printers, remember to increase LP_NO */
140 #define LP_NO 8
142 /* ROUND_UP macro from fs/select.c */
143 #define ROUND_UP(x,y) (((x)+(y)-1)/(y))
145 static struct lp_struct lp_table[LP_NO];
147 static unsigned int lp_count = 0;
148 static struct class *lp_class;
150 #ifdef CONFIG_LP_CONSOLE
151 static struct parport *console_registered; // initially NULL
152 #endif /* CONFIG_LP_CONSOLE */
154 #undef LP_DEBUG
156 /* Bits used to manage claiming the parport device */
157 #define LP_PREEMPT_REQUEST 1
158 #define LP_PARPORT_CLAIMED 2
160 /* --- low-level port access ----------------------------------- */
162 #define r_dtr(x) (parport_read_data(lp_table[(x)].dev->port))
163 #define r_str(x) (parport_read_status(lp_table[(x)].dev->port))
164 #define w_ctr(x,y) do { parport_write_control(lp_table[(x)].dev->port, (y)); } while (0)
165 #define w_dtr(x,y) do { parport_write_data(lp_table[(x)].dev->port, (y)); } while (0)
167 /* Claim the parport or block trying unless we've already claimed it */
168 static void lp_claim_parport_or_block(struct lp_struct *this_lp)
169 {
170 if (!test_and_set_bit(LP_PARPORT_CLAIMED, &this_lp->bits)) {
171 parport_claim_or_block (this_lp->dev);
172 }
173 }
175 /* Claim the parport or block trying unless we've already claimed it */
176 static void lp_release_parport(struct lp_struct *this_lp)
177 {
178 if (test_and_clear_bit(LP_PARPORT_CLAIMED, &this_lp->bits)) {
179 parport_release (this_lp->dev);
180 }
181 }
185 static int lp_preempt(void *handle)
186 {
187 struct lp_struct *this_lp = (struct lp_struct *)handle;
188 set_bit(LP_PREEMPT_REQUEST, &this_lp->bits);
189 return (1);
190 }
193 /*
194 * Try to negotiate to a new mode; if unsuccessful negotiate to
195 * compatibility mode. Return the mode we ended up in.
196 */
197 static int lp_negotiate(struct parport * port, int mode)
198 {
199 if (parport_negotiate (port, mode) != 0) {
200 mode = IEEE1284_MODE_COMPAT;
201 parport_negotiate (port, mode);
202 }
204 return (mode);
205 }
207 static int lp_reset(int minor)
208 {
209 int retval;
210 lp_claim_parport_or_block (&lp_table[minor]);
211 w_ctr(minor, LP_PSELECP);
212 udelay (LP_DELAY);
213 w_ctr(minor, LP_PSELECP | LP_PINITP);
214 retval = r_str(minor);
215 lp_release_parport (&lp_table[minor]);
216 return retval;
217 }
219 static void lp_error (int minor)
220 {
221 DEFINE_WAIT(wait);
222 int polling;
224 if (LP_F(minor) & LP_ABORT)
225 return;
227 polling = lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE;
228 if (polling) lp_release_parport (&lp_table[minor]);
229 prepare_to_wait(&lp_table[minor].waitq, &wait, TASK_INTERRUPTIBLE);
230 schedule_timeout(LP_TIMEOUT_POLLED);
231 finish_wait(&lp_table[minor].waitq, &wait);
232 if (polling) lp_claim_parport_or_block (&lp_table[minor]);
233 else parport_yield_blocking (lp_table[minor].dev);
234 }
236 static int lp_check_status(int minor)
237 {
238 int error = 0;
239 unsigned int last = lp_table[minor].last_error;
240 unsigned char status = r_str(minor);
241 if ((status & LP_PERRORP) && !(LP_F(minor) & LP_CAREFUL))
242 /* No error. */
243 last = 0;
244 else if ((status & LP_POUTPA)) {
245 if (last != LP_POUTPA) {
246 last = LP_POUTPA;
247 printk(KERN_INFO "lp%d out of paper\n", minor);
248 }
249 error = -ENOSPC;
250 } else if (!(status & LP_PSELECD)) {
251 if (last != LP_PSELECD) {
252 last = LP_PSELECD;
253 printk(KERN_INFO "lp%d off-line\n", minor);
254 }
255 error = -EIO;
256 } else if (!(status & LP_PERRORP)) {
257 if (last != LP_PERRORP) {
258 last = LP_PERRORP;
259 printk(KERN_INFO "lp%d on fire\n", minor);
260 }
261 error = -EIO;
262 } else {
263 last = 0; /* Come here if LP_CAREFUL is set and no
264 errors are reported. */
265 }
267 lp_table[minor].last_error = last;
269 if (last != 0)
270 lp_error(minor);
272 return error;
273 }
275 static int lp_wait_ready(int minor, int nonblock)
276 {
277 int error = 0;
279 /* If we're not in compatibility mode, we're ready now! */
280 if (lp_table[minor].current_mode != IEEE1284_MODE_COMPAT) {
281 return (0);
282 }
284 do {
285 error = lp_check_status (minor);
286 if (error && (nonblock || (LP_F(minor) & LP_ABORT)))
287 break;
288 if (signal_pending (current)) {
289 error = -EINTR;
290 break;
291 }
292 } while (error);
293 return error;
294 }
296 static ssize_t lp_write(struct file * file, const char __user * buf,
297 size_t count, loff_t *ppos)
298 {
299 unsigned int minor = iminor(file->f_dentry->d_inode);
300 struct parport *port = lp_table[minor].dev->port;
301 char *kbuf = lp_table[minor].lp_buffer;
302 ssize_t retv = 0;
303 ssize_t written;
304 size_t copy_size = count;
305 int nonblock = ((file->f_flags & O_NONBLOCK) ||
306 (LP_F(minor) & LP_ABORT));
308 #ifdef LP_STATS
309 if (time_after(jiffies, lp_table[minor].lastcall + LP_TIME(minor)))
310 lp_table[minor].runchars = 0;
312 lp_table[minor].lastcall = jiffies;
313 #endif
315 /* Need to copy the data from user-space. */
316 if (copy_size > LP_BUFFER_SIZE)
317 copy_size = LP_BUFFER_SIZE;
319 if (down_interruptible (&lp_table[minor].port_mutex))
320 return -EINTR;
322 if (copy_from_user (kbuf, buf, copy_size)) {
323 retv = -EFAULT;
324 goto out_unlock;
325 }
327 /* Claim Parport or sleep until it becomes available
328 */
329 lp_claim_parport_or_block (&lp_table[minor]);
330 /* Go to the proper mode. */
331 lp_table[minor].current_mode = lp_negotiate (port,
332 lp_table[minor].best_mode);
334 parport_set_timeout (lp_table[minor].dev,
335 (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK
336 : lp_table[minor].timeout));
338 if ((retv = lp_wait_ready (minor, nonblock)) == 0)
339 do {
340 /* Write the data. */
341 written = parport_write (port, kbuf, copy_size);
342 if (written > 0) {
343 copy_size -= written;
344 count -= written;
345 buf += written;
346 retv += written;
347 }
349 if (signal_pending (current)) {
350 if (retv == 0)
351 retv = -EINTR;
353 break;
354 }
356 if (copy_size > 0) {
357 /* incomplete write -> check error ! */
358 int error;
360 parport_negotiate (lp_table[minor].dev->port,
361 IEEE1284_MODE_COMPAT);
362 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
364 error = lp_wait_ready (minor, nonblock);
366 if (error) {
367 if (retv == 0)
368 retv = error;
369 break;
370 } else if (nonblock) {
371 if (retv == 0)
372 retv = -EAGAIN;
373 break;
374 }
376 parport_yield_blocking (lp_table[minor].dev);
377 lp_table[minor].current_mode
378 = lp_negotiate (port,
379 lp_table[minor].best_mode);
381 } else if (need_resched())
382 schedule ();
384 if (count) {
385 copy_size = count;
386 if (copy_size > LP_BUFFER_SIZE)
387 copy_size = LP_BUFFER_SIZE;
389 if (copy_from_user(kbuf, buf, copy_size)) {
390 if (retv == 0)
391 retv = -EFAULT;
392 break;
393 }
394 }
395 } while (count > 0);
397 if (test_and_clear_bit(LP_PREEMPT_REQUEST,
398 &lp_table[minor].bits)) {
399 printk(KERN_INFO "lp%d releasing parport\n", minor);
400 parport_negotiate (lp_table[minor].dev->port,
401 IEEE1284_MODE_COMPAT);
402 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
403 lp_release_parport (&lp_table[minor]);
404 }
405 out_unlock:
406 up (&lp_table[minor].port_mutex);
408 return retv;
409 }
411 #ifdef CONFIG_PARPORT_1284
413 /* Status readback conforming to ieee1284 */
414 static ssize_t lp_read(struct file * file, char __user * buf,
415 size_t count, loff_t *ppos)
416 {
417 DEFINE_WAIT(wait);
418 unsigned int minor=iminor(file->f_dentry->d_inode);
419 struct parport *port = lp_table[minor].dev->port;
420 ssize_t retval = 0;
421 char *kbuf = lp_table[minor].lp_buffer;
422 int nonblock = ((file->f_flags & O_NONBLOCK) ||
423 (LP_F(minor) & LP_ABORT));
425 if (count > LP_BUFFER_SIZE)
426 count = LP_BUFFER_SIZE;
428 if (down_interruptible (&lp_table[minor].port_mutex))
429 return -EINTR;
431 lp_claim_parport_or_block (&lp_table[minor]);
433 parport_set_timeout (lp_table[minor].dev,
434 (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK
435 : lp_table[minor].timeout));
437 parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
438 if (parport_negotiate (lp_table[minor].dev->port,
439 IEEE1284_MODE_NIBBLE)) {
440 retval = -EIO;
441 goto out;
442 }
444 while (retval == 0) {
445 retval = parport_read (port, kbuf, count);
447 if (retval > 0)
448 break;
450 if (nonblock) {
451 retval = -EAGAIN;
452 break;
453 }
455 /* Wait for data. */
457 if (lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE) {
458 parport_negotiate (lp_table[minor].dev->port,
459 IEEE1284_MODE_COMPAT);
460 lp_error (minor);
461 if (parport_negotiate (lp_table[minor].dev->port,
462 IEEE1284_MODE_NIBBLE)) {
463 retval = -EIO;
464 goto out;
465 }
466 } else {
467 prepare_to_wait(&lp_table[minor].waitq, &wait, TASK_INTERRUPTIBLE);
468 schedule_timeout(LP_TIMEOUT_POLLED);
469 finish_wait(&lp_table[minor].waitq, &wait);
470 }
472 if (signal_pending (current)) {
473 retval = -ERESTARTSYS;
474 break;
475 }
477 cond_resched ();
478 }
479 parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
480 out:
481 lp_release_parport (&lp_table[minor]);
483 if (retval > 0 && copy_to_user (buf, kbuf, retval))
484 retval = -EFAULT;
486 up (&lp_table[minor].port_mutex);
488 return retval;
489 }
491 #endif /* IEEE 1284 support */
493 static int lp_open(struct inode * inode, struct file * file)
494 {
495 unsigned int minor = iminor(inode);
497 if (minor >= LP_NO)
498 return -ENXIO;
499 if ((LP_F(minor) & LP_EXIST) == 0)
500 return -ENXIO;
501 if (test_and_set_bit(LP_BUSY_BIT_POS, &LP_F(minor)))
502 return -EBUSY;
504 /* If ABORTOPEN is set and the printer is offline or out of paper,
505 we may still want to open it to perform ioctl()s. Therefore we
506 have commandeered O_NONBLOCK, even though it is being used in
507 a non-standard manner. This is strictly a Linux hack, and
508 should most likely only ever be used by the tunelp application. */
509 if ((LP_F(minor) & LP_ABORTOPEN) && !(file->f_flags & O_NONBLOCK)) {
510 int status;
511 lp_claim_parport_or_block (&lp_table[minor]);
512 status = r_str(minor);
513 lp_release_parport (&lp_table[minor]);
514 if (status & LP_POUTPA) {
515 printk(KERN_INFO "lp%d out of paper\n", minor);
516 LP_F(minor) &= ~LP_BUSY;
517 return -ENOSPC;
518 } else if (!(status & LP_PSELECD)) {
519 printk(KERN_INFO "lp%d off-line\n", minor);
520 LP_F(minor) &= ~LP_BUSY;
521 return -EIO;
522 } else if (!(status & LP_PERRORP)) {
523 printk(KERN_ERR "lp%d printer error\n", minor);
524 LP_F(minor) &= ~LP_BUSY;
525 return -EIO;
526 }
527 }
528 lp_table[minor].lp_buffer = (char *) kmalloc(LP_BUFFER_SIZE, GFP_KERNEL);
529 if (!lp_table[minor].lp_buffer) {
530 LP_F(minor) &= ~LP_BUSY;
531 return -ENOMEM;
532 }
533 /* Determine if the peripheral supports ECP mode */
534 lp_claim_parport_or_block (&lp_table[minor]);
535 if ( (lp_table[minor].dev->port->modes & PARPORT_MODE_ECP) &&
536 !parport_negotiate (lp_table[minor].dev->port,
537 IEEE1284_MODE_ECP)) {
538 printk (KERN_INFO "lp%d: ECP mode\n", minor);
539 lp_table[minor].best_mode = IEEE1284_MODE_ECP;
540 } else {
541 lp_table[minor].best_mode = IEEE1284_MODE_COMPAT;
542 }
543 /* Leave peripheral in compatibility mode */
544 parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
545 lp_release_parport (&lp_table[minor]);
546 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
547 return 0;
548 }
550 static int lp_release(struct inode * inode, struct file * file)
551 {
552 unsigned int minor = iminor(inode);
554 lp_claim_parport_or_block (&lp_table[minor]);
555 parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
556 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
557 lp_release_parport (&lp_table[minor]);
558 kfree(lp_table[minor].lp_buffer);
559 lp_table[minor].lp_buffer = NULL;
560 LP_F(minor) &= ~LP_BUSY;
561 return 0;
562 }
564 static int lp_ioctl(struct inode *inode, struct file *file,
565 unsigned int cmd, unsigned long arg)
566 {
567 unsigned int minor = iminor(inode);
568 int status;
569 int retval = 0;
570 void __user *argp = (void __user *)arg;
572 #ifdef LP_DEBUG
573 printk(KERN_DEBUG "lp%d ioctl, cmd: 0x%x, arg: 0x%lx\n", minor, cmd, arg);
574 #endif
575 if (minor >= LP_NO)
576 return -ENODEV;
577 if ((LP_F(minor) & LP_EXIST) == 0)
578 return -ENODEV;
579 switch ( cmd ) {
580 struct timeval par_timeout;
581 long to_jiffies;
583 case LPTIME:
584 LP_TIME(minor) = arg * HZ/100;
585 break;
586 case LPCHAR:
587 LP_CHAR(minor) = arg;
588 break;
589 case LPABORT:
590 if (arg)
591 LP_F(minor) |= LP_ABORT;
592 else
593 LP_F(minor) &= ~LP_ABORT;
594 break;
595 case LPABORTOPEN:
596 if (arg)
597 LP_F(minor) |= LP_ABORTOPEN;
598 else
599 LP_F(minor) &= ~LP_ABORTOPEN;
600 break;
601 case LPCAREFUL:
602 if (arg)
603 LP_F(minor) |= LP_CAREFUL;
604 else
605 LP_F(minor) &= ~LP_CAREFUL;
606 break;
607 case LPWAIT:
608 LP_WAIT(minor) = arg;
609 break;
610 case LPSETIRQ:
611 return -EINVAL;
612 break;
613 case LPGETIRQ:
614 if (copy_to_user(argp, &LP_IRQ(minor),
615 sizeof(int)))
616 return -EFAULT;
617 break;
618 case LPGETSTATUS:
619 lp_claim_parport_or_block (&lp_table[minor]);
620 status = r_str(minor);
621 lp_release_parport (&lp_table[minor]);
623 if (copy_to_user(argp, &status, sizeof(int)))
624 return -EFAULT;
625 break;
626 case LPRESET:
627 lp_reset(minor);
628 break;
629 #ifdef LP_STATS
630 case LPGETSTATS:
631 if (copy_to_user(argp, &LP_STAT(minor),
632 sizeof(struct lp_stats)))
633 return -EFAULT;
634 if (capable(CAP_SYS_ADMIN))
635 memset(&LP_STAT(minor), 0,
636 sizeof(struct lp_stats));
637 break;
638 #endif
639 case LPGETFLAGS:
640 status = LP_F(minor);
641 if (copy_to_user(argp, &status, sizeof(int)))
642 return -EFAULT;
643 break;
645 case LPSETTIMEOUT:
646 if (copy_from_user (&par_timeout, argp,
647 sizeof (struct timeval))) {
648 return -EFAULT;
649 }
650 /* Convert to jiffies, place in lp_table */
651 if ((par_timeout.tv_sec < 0) ||
652 (par_timeout.tv_usec < 0)) {
653 return -EINVAL;
654 }
655 to_jiffies = ROUND_UP(par_timeout.tv_usec, 1000000/HZ);
656 to_jiffies += par_timeout.tv_sec * (long) HZ;
657 if (to_jiffies <= 0) {
658 return -EINVAL;
659 }
660 lp_table[minor].timeout = to_jiffies;
661 break;
663 default:
664 retval = -EINVAL;
665 }
666 return retval;
667 }
669 static const struct file_operations lp_fops = {
670 .owner = THIS_MODULE,
671 .write = lp_write,
672 .ioctl = lp_ioctl,
673 .open = lp_open,
674 .release = lp_release,
675 #ifdef CONFIG_PARPORT_1284
676 .read = lp_read,
677 #endif
678 };
680 /* --- support for console on the line printer ----------------- */
682 #ifdef CONFIG_LP_CONSOLE
684 #define CONSOLE_LP 0
686 /* If the printer is out of paper, we can either lose the messages or
687 * stall until the printer is happy again. Define CONSOLE_LP_STRICT
688 * non-zero to get the latter behaviour. */
689 #define CONSOLE_LP_STRICT 1
691 /* The console must be locked when we get here. */
693 static void lp_console_write (struct console *co, const char *s,
694 unsigned count)
695 {
696 struct pardevice *dev = lp_table[CONSOLE_LP].dev;
697 struct parport *port = dev->port;
698 ssize_t written;
700 if (parport_claim (dev))
701 /* Nothing we can do. */
702 return;
704 parport_set_timeout (dev, 0);
706 /* Go to compatibility mode. */
707 parport_negotiate (port, IEEE1284_MODE_COMPAT);
709 do {
710 /* Write the data, converting LF->CRLF as we go. */
711 ssize_t canwrite = count;
712 char *lf = memchr (s, '\n', count);
713 if (lf)
714 canwrite = lf - s;
716 if (canwrite > 0) {
717 written = parport_write (port, s, canwrite);
719 if (written <= 0)
720 continue;
722 s += written;
723 count -= written;
724 canwrite -= written;
725 }
727 if (lf && canwrite <= 0) {
728 const char *crlf = "\r\n";
729 int i = 2;
731 /* Dodge the original '\n', and put '\r\n' instead. */
732 s++;
733 count--;
734 do {
735 written = parport_write (port, crlf, i);
736 if (written > 0)
737 i -= written, crlf += written;
738 } while (i > 0 && (CONSOLE_LP_STRICT || written > 0));
739 }
740 } while (count > 0 && (CONSOLE_LP_STRICT || written > 0));
742 parport_release (dev);
743 }
745 static struct console lpcons = {
746 .name = "lp",
747 .write = lp_console_write,
748 .flags = CON_PRINTBUFFER,
749 };
751 #endif /* console on line printer */
753 /* --- initialisation code ------------------------------------- */
755 static int parport_nr[LP_NO] = { [0 ... LP_NO-1] = LP_PARPORT_UNSPEC };
756 static char *parport[LP_NO] = { NULL, };
757 static int reset = 0;
759 module_param_array(parport, charp, NULL, 0);
760 module_param(reset, bool, 0);
762 #ifndef MODULE
763 static int __init lp_setup (char *str)
764 {
765 static int parport_ptr; // initially zero
766 int x;
768 if (get_option (&str, &x)) {
769 if (x == 0) {
770 /* disable driver on "lp=" or "lp=0" */
771 parport_nr[0] = LP_PARPORT_OFF;
772 } else {
773 printk(KERN_WARNING "warning: 'lp=0x%x' is deprecated, ignored\n", x);
774 return 0;
775 }
776 } else if (!strncmp(str, "parport", 7)) {
777 int n = simple_strtoul(str+7, NULL, 10);
778 if (parport_ptr < LP_NO)
779 parport_nr[parport_ptr++] = n;
780 else
781 printk(KERN_INFO "lp: too many ports, %s ignored.\n",
782 str);
783 } else if (!strcmp(str, "auto")) {
784 parport_nr[0] = LP_PARPORT_AUTO;
785 } else if (!strcmp(str, "none")) {
786 parport_nr[parport_ptr++] = LP_PARPORT_NONE;
787 } else if (!strcmp(str, "reset")) {
788 reset = 1;
789 }
790 return 1;
791 }
792 #endif
794 static int lp_register(int nr, struct parport *port)
795 {
796 lp_table[nr].dev = parport_register_device(port, "lp",
797 lp_preempt, NULL, NULL, 0,
798 (void *) &lp_table[nr]);
799 if (lp_table[nr].dev == NULL)
800 return 1;
801 lp_table[nr].flags |= LP_EXIST;
803 if (reset)
804 lp_reset(nr);
806 class_device_create(lp_class, NULL, MKDEV(LP_MAJOR, nr), NULL,
807 "lp%d", nr);
809 printk(KERN_INFO "lp%d: using %s (%s).\n", nr, port->name,
810 (port->irq == PARPORT_IRQ_NONE)?"polling":"interrupt-driven");
812 #ifdef CONFIG_LP_CONSOLE
813 if (!nr) {
814 if (port->modes & PARPORT_MODE_SAFEININT) {
815 register_console (&lpcons);
816 console_registered = port;
817 printk (KERN_INFO "lp%d: console ready\n", CONSOLE_LP);
818 } else
819 printk (KERN_ERR "lp%d: cannot run console on %s\n",
820 CONSOLE_LP, port->name);
821 }
822 #endif
824 return 0;
825 }
827 static void lp_attach (struct parport *port)
828 {
829 unsigned int i;
831 switch (parport_nr[0])
832 {
833 case LP_PARPORT_UNSPEC:
834 case LP_PARPORT_AUTO:
835 if (parport_nr[0] == LP_PARPORT_AUTO &&
836 port->probe_info[0].class != PARPORT_CLASS_PRINTER)
837 return;
838 if (lp_count == LP_NO) {
839 printk(KERN_INFO "lp: ignoring parallel port (max. %d)\n",LP_NO);
840 return;
841 }
842 if (!lp_register(lp_count, port))
843 lp_count++;
844 break;
846 default:
847 for (i = 0; i < LP_NO; i++) {
848 if (port->number == parport_nr[i]) {
849 if (!lp_register(i, port))
850 lp_count++;
851 break;
852 }
853 }
854 break;
855 }
856 }
858 static void lp_detach (struct parport *port)
859 {
860 /* Write this some day. */
861 #ifdef CONFIG_LP_CONSOLE
862 if (console_registered == port) {
863 unregister_console (&lpcons);
864 console_registered = NULL;
865 }
866 #endif /* CONFIG_LP_CONSOLE */
867 }
869 static struct parport_driver lp_driver = {
870 .name = "lp",
871 .attach = lp_attach,
872 .detach = lp_detach,
873 };
875 static int __init lp_init (void)
876 {
877 int i, err = 0;
879 if (parport_nr[0] == LP_PARPORT_OFF)
880 return 0;
882 for (i = 0; i < LP_NO; i++) {
883 lp_table[i].dev = NULL;
884 lp_table[i].flags = 0;
885 lp_table[i].chars = LP_INIT_CHAR;
886 lp_table[i].time = LP_INIT_TIME;
887 lp_table[i].wait = LP_INIT_WAIT;
888 lp_table[i].lp_buffer = NULL;
889 #ifdef LP_STATS
890 lp_table[i].lastcall = 0;
891 lp_table[i].runchars = 0;
892 memset (&lp_table[i].stats, 0, sizeof (struct lp_stats));
893 #endif
894 lp_table[i].last_error = 0;
895 init_waitqueue_head (&lp_table[i].waitq);
896 init_waitqueue_head (&lp_table[i].dataq);
897 init_MUTEX (&lp_table[i].port_mutex);
898 lp_table[i].timeout = 10 * HZ;
899 }
901 if (register_chrdev (LP_MAJOR, "lp", &lp_fops)) {
902 printk (KERN_ERR "lp: unable to get major %d\n", LP_MAJOR);
903 return -EIO;
904 }
906 lp_class = class_create(THIS_MODULE, "printer");
907 if (IS_ERR(lp_class)) {
908 err = PTR_ERR(lp_class);
909 goto out_devfs;
910 }
912 if (parport_register_driver (&lp_driver)) {
913 printk (KERN_ERR "lp: unable to register with parport\n");
914 err = -EIO;
915 goto out_class;
916 }
918 if (!lp_count) {
919 printk (KERN_INFO "lp: driver loaded but no devices found\n");
920 #ifndef CONFIG_PARPORT_1284
921 if (parport_nr[0] == LP_PARPORT_AUTO)
922 printk (KERN_INFO "lp: (is IEEE 1284 support enabled?)\n");
923 #endif
924 }
926 return 0;
928 out_class:
929 class_destroy(lp_class);
930 out_devfs:
931 unregister_chrdev(LP_MAJOR, "lp");
932 return err;
933 }
935 static int __init lp_init_module (void)
936 {
937 if (parport[0]) {
938 /* The user gave some parameters. Let's see what they were. */
939 if (!strncmp(parport[0], "auto", 4))
940 parport_nr[0] = LP_PARPORT_AUTO;
941 else {
942 int n;
943 for (n = 0; n < LP_NO && parport[n]; n++) {
944 if (!strncmp(parport[n], "none", 4))
945 parport_nr[n] = LP_PARPORT_NONE;
946 else {
947 char *ep;
948 unsigned long r = simple_strtoul(parport[n], &ep, 0);
949 if (ep != parport[n])
950 parport_nr[n] = r;
951 else {
952 printk(KERN_ERR "lp: bad port specifier `%s'\n", parport[n]);
953 return -ENODEV;
954 }
955 }
956 }
957 }
958 }
960 return lp_init();
961 }
963 static void lp_cleanup_module (void)
964 {
965 unsigned int offset;
967 parport_unregister_driver (&lp_driver);
969 #ifdef CONFIG_LP_CONSOLE
970 unregister_console (&lpcons);
971 #endif
973 unregister_chrdev(LP_MAJOR, "lp");
974 for (offset = 0; offset < LP_NO; offset++) {
975 if (lp_table[offset].dev == NULL)
976 continue;
977 parport_unregister_device(lp_table[offset].dev);
978 class_device_destroy(lp_class, MKDEV(LP_MAJOR, offset));
979 }
980 class_destroy(lp_class);
981 }
983 __setup("lp=", lp_setup);
984 module_init(lp_init_module);
985 module_exit(lp_cleanup_module);
987 MODULE_ALIAS_CHARDEV_MAJOR(LP_MAJOR);
988 MODULE_LICENSE("GPL");