xref: /openbmc/linux/drivers/char/lp.c (revision 22246614)
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 
130 #include <linux/parport.h>
131 #undef LP_STATS
132 #include <linux/lp.h>
133 
134 #include <asm/irq.h>
135 #include <asm/uaccess.h>
136 #include <asm/system.h>
137 
138 /* if you have more than 8 printers, remember to increase LP_NO */
139 #define LP_NO 8
140 
141 static struct lp_struct lp_table[LP_NO];
142 
143 static unsigned int lp_count = 0;
144 static struct class *lp_class;
145 
146 #ifdef CONFIG_LP_CONSOLE
147 static struct parport *console_registered;
148 #endif /* CONFIG_LP_CONSOLE */
149 
150 #undef LP_DEBUG
151 
152 /* Bits used to manage claiming the parport device */
153 #define LP_PREEMPT_REQUEST 1
154 #define LP_PARPORT_CLAIMED 2
155 
156 /* --- low-level port access ----------------------------------- */
157 
158 #define r_dtr(x)	(parport_read_data(lp_table[(x)].dev->port))
159 #define r_str(x)	(parport_read_status(lp_table[(x)].dev->port))
160 #define w_ctr(x,y)	do { parport_write_control(lp_table[(x)].dev->port, (y)); } while (0)
161 #define w_dtr(x,y)	do { parport_write_data(lp_table[(x)].dev->port, (y)); } while (0)
162 
163 /* Claim the parport or block trying unless we've already claimed it */
164 static void lp_claim_parport_or_block(struct lp_struct *this_lp)
165 {
166 	if (!test_and_set_bit(LP_PARPORT_CLAIMED, &this_lp->bits)) {
167 		parport_claim_or_block (this_lp->dev);
168 	}
169 }
170 
171 /* Claim the parport or block trying unless we've already claimed it */
172 static void lp_release_parport(struct lp_struct *this_lp)
173 {
174 	if (test_and_clear_bit(LP_PARPORT_CLAIMED, &this_lp->bits)) {
175 		parport_release (this_lp->dev);
176 	}
177 }
178 
179 
180 
181 static int lp_preempt(void *handle)
182 {
183 	struct lp_struct *this_lp = (struct lp_struct *)handle;
184 	set_bit(LP_PREEMPT_REQUEST, &this_lp->bits);
185 	return (1);
186 }
187 
188 
189 /*
190  * Try to negotiate to a new mode; if unsuccessful negotiate to
191  * compatibility mode.  Return the mode we ended up in.
192  */
193 static int lp_negotiate(struct parport * port, int mode)
194 {
195 	if (parport_negotiate (port, mode) != 0) {
196 		mode = IEEE1284_MODE_COMPAT;
197 		parport_negotiate (port, mode);
198 	}
199 
200 	return (mode);
201 }
202 
203 static int lp_reset(int minor)
204 {
205 	int retval;
206 	lp_claim_parport_or_block (&lp_table[minor]);
207 	w_ctr(minor, LP_PSELECP);
208 	udelay (LP_DELAY);
209 	w_ctr(minor, LP_PSELECP | LP_PINITP);
210 	retval = r_str(minor);
211 	lp_release_parport (&lp_table[minor]);
212 	return retval;
213 }
214 
215 static void lp_error (int minor)
216 {
217 	DEFINE_WAIT(wait);
218 	int polling;
219 
220 	if (LP_F(minor) & LP_ABORT)
221 		return;
222 
223 	polling = lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE;
224 	if (polling) lp_release_parport (&lp_table[minor]);
225 	prepare_to_wait(&lp_table[minor].waitq, &wait, TASK_INTERRUPTIBLE);
226 	schedule_timeout(LP_TIMEOUT_POLLED);
227 	finish_wait(&lp_table[minor].waitq, &wait);
228 	if (polling) lp_claim_parport_or_block (&lp_table[minor]);
229 	else parport_yield_blocking (lp_table[minor].dev);
230 }
231 
232 static int lp_check_status(int minor)
233 {
234 	int error = 0;
235 	unsigned int last = lp_table[minor].last_error;
236 	unsigned char status = r_str(minor);
237 	if ((status & LP_PERRORP) && !(LP_F(minor) & LP_CAREFUL))
238 		/* No error. */
239 		last = 0;
240 	else if ((status & LP_POUTPA)) {
241 		if (last != LP_POUTPA) {
242 			last = LP_POUTPA;
243 			printk(KERN_INFO "lp%d out of paper\n", minor);
244 		}
245 		error = -ENOSPC;
246 	} else if (!(status & LP_PSELECD)) {
247 		if (last != LP_PSELECD) {
248 			last = LP_PSELECD;
249 			printk(KERN_INFO "lp%d off-line\n", minor);
250 		}
251 		error = -EIO;
252 	} else if (!(status & LP_PERRORP)) {
253 		if (last != LP_PERRORP) {
254 			last = LP_PERRORP;
255 			printk(KERN_INFO "lp%d on fire\n", minor);
256 		}
257 		error = -EIO;
258 	} else {
259 		last = 0; /* Come here if LP_CAREFUL is set and no
260                              errors are reported. */
261 	}
262 
263 	lp_table[minor].last_error = last;
264 
265 	if (last != 0)
266 		lp_error(minor);
267 
268 	return error;
269 }
270 
271 static int lp_wait_ready(int minor, int nonblock)
272 {
273 	int error = 0;
274 
275 	/* If we're not in compatibility mode, we're ready now! */
276 	if (lp_table[minor].current_mode != IEEE1284_MODE_COMPAT) {
277 	  return (0);
278 	}
279 
280 	do {
281 		error = lp_check_status (minor);
282 		if (error && (nonblock || (LP_F(minor) & LP_ABORT)))
283 			break;
284 		if (signal_pending (current)) {
285 			error = -EINTR;
286 			break;
287 		}
288 	} while (error);
289 	return error;
290 }
291 
292 static ssize_t lp_write(struct file * file, const char __user * buf,
293 		        size_t count, loff_t *ppos)
294 {
295 	unsigned int minor = iminor(file->f_path.dentry->d_inode);
296 	struct parport *port = lp_table[minor].dev->port;
297 	char *kbuf = lp_table[minor].lp_buffer;
298 	ssize_t retv = 0;
299 	ssize_t written;
300 	size_t copy_size = count;
301 	int nonblock = ((file->f_flags & O_NONBLOCK) ||
302 			(LP_F(minor) & LP_ABORT));
303 
304 #ifdef LP_STATS
305 	if (time_after(jiffies, lp_table[minor].lastcall + LP_TIME(minor)))
306 		lp_table[minor].runchars = 0;
307 
308 	lp_table[minor].lastcall = jiffies;
309 #endif
310 
311 	/* Need to copy the data from user-space. */
312 	if (copy_size > LP_BUFFER_SIZE)
313 		copy_size = LP_BUFFER_SIZE;
314 
315 	if (mutex_lock_interruptible(&lp_table[minor].port_mutex))
316 		return -EINTR;
317 
318 	if (copy_from_user (kbuf, buf, copy_size)) {
319 		retv = -EFAULT;
320 		goto out_unlock;
321 	}
322 
323  	/* Claim Parport or sleep until it becomes available
324  	 */
325 	lp_claim_parport_or_block (&lp_table[minor]);
326 	/* Go to the proper mode. */
327 	lp_table[minor].current_mode = lp_negotiate (port,
328 						     lp_table[minor].best_mode);
329 
330 	parport_set_timeout (lp_table[minor].dev,
331 			     (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK
332 			      : lp_table[minor].timeout));
333 
334 	if ((retv = lp_wait_ready (minor, nonblock)) == 0)
335 	do {
336 		/* Write the data. */
337 		written = parport_write (port, kbuf, copy_size);
338 		if (written > 0) {
339 			copy_size -= written;
340 			count -= written;
341 			buf  += written;
342 			retv += written;
343 		}
344 
345 		if (signal_pending (current)) {
346 			if (retv == 0)
347 				retv = -EINTR;
348 
349 			break;
350 		}
351 
352 		if (copy_size > 0) {
353 			/* incomplete write -> check error ! */
354 			int error;
355 
356 			parport_negotiate (lp_table[minor].dev->port,
357 					   IEEE1284_MODE_COMPAT);
358 			lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
359 
360 			error = lp_wait_ready (minor, nonblock);
361 
362 			if (error) {
363 				if (retv == 0)
364 					retv = error;
365 				break;
366 			} else if (nonblock) {
367 				if (retv == 0)
368 					retv = -EAGAIN;
369 				break;
370 			}
371 
372 			parport_yield_blocking (lp_table[minor].dev);
373 			lp_table[minor].current_mode
374 			  = lp_negotiate (port,
375 					  lp_table[minor].best_mode);
376 
377 		} else if (need_resched())
378 			schedule ();
379 
380 		if (count) {
381 			copy_size = count;
382 			if (copy_size > LP_BUFFER_SIZE)
383 				copy_size = LP_BUFFER_SIZE;
384 
385 			if (copy_from_user(kbuf, buf, copy_size)) {
386 				if (retv == 0)
387 					retv = -EFAULT;
388 				break;
389 			}
390 		}
391 	} while (count > 0);
392 
393 	if (test_and_clear_bit(LP_PREEMPT_REQUEST,
394 			       &lp_table[minor].bits)) {
395 		printk(KERN_INFO "lp%d releasing parport\n", minor);
396 		parport_negotiate (lp_table[minor].dev->port,
397 				   IEEE1284_MODE_COMPAT);
398 		lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
399 		lp_release_parport (&lp_table[minor]);
400 	}
401 out_unlock:
402 	mutex_unlock(&lp_table[minor].port_mutex);
403 
404  	return retv;
405 }
406 
407 #ifdef CONFIG_PARPORT_1284
408 
409 /* Status readback conforming to ieee1284 */
410 static ssize_t lp_read(struct file * file, char __user * buf,
411 		       size_t count, loff_t *ppos)
412 {
413 	DEFINE_WAIT(wait);
414 	unsigned int minor=iminor(file->f_path.dentry->d_inode);
415 	struct parport *port = lp_table[minor].dev->port;
416 	ssize_t retval = 0;
417 	char *kbuf = lp_table[minor].lp_buffer;
418 	int nonblock = ((file->f_flags & O_NONBLOCK) ||
419 			(LP_F(minor) & LP_ABORT));
420 
421 	if (count > LP_BUFFER_SIZE)
422 		count = LP_BUFFER_SIZE;
423 
424 	if (mutex_lock_interruptible(&lp_table[minor].port_mutex))
425 		return -EINTR;
426 
427 	lp_claim_parport_or_block (&lp_table[minor]);
428 
429 	parport_set_timeout (lp_table[minor].dev,
430 			     (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK
431 			      : lp_table[minor].timeout));
432 
433 	parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
434 	if (parport_negotiate (lp_table[minor].dev->port,
435 			       IEEE1284_MODE_NIBBLE)) {
436 		retval = -EIO;
437 		goto out;
438 	}
439 
440 	while (retval == 0) {
441 		retval = parport_read (port, kbuf, count);
442 
443 		if (retval > 0)
444 			break;
445 
446 		if (nonblock) {
447 			retval = -EAGAIN;
448 			break;
449 		}
450 
451 		/* Wait for data. */
452 
453 		if (lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE) {
454 			parport_negotiate (lp_table[minor].dev->port,
455 					   IEEE1284_MODE_COMPAT);
456 			lp_error (minor);
457 			if (parport_negotiate (lp_table[minor].dev->port,
458 					       IEEE1284_MODE_NIBBLE)) {
459 				retval = -EIO;
460 				goto out;
461 			}
462 		} else {
463 			prepare_to_wait(&lp_table[minor].waitq, &wait, TASK_INTERRUPTIBLE);
464 			schedule_timeout(LP_TIMEOUT_POLLED);
465 			finish_wait(&lp_table[minor].waitq, &wait);
466 		}
467 
468 		if (signal_pending (current)) {
469 			retval = -ERESTARTSYS;
470 			break;
471 		}
472 
473 		cond_resched ();
474 	}
475 	parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
476  out:
477 	lp_release_parport (&lp_table[minor]);
478 
479 	if (retval > 0 && copy_to_user (buf, kbuf, retval))
480 		retval = -EFAULT;
481 
482 	mutex_unlock(&lp_table[minor].port_mutex);
483 
484 	return retval;
485 }
486 
487 #endif /* IEEE 1284 support */
488 
489 static int lp_open(struct inode * inode, struct file * file)
490 {
491 	unsigned int minor = iminor(inode);
492 
493 	if (minor >= LP_NO)
494 		return -ENXIO;
495 	if ((LP_F(minor) & LP_EXIST) == 0)
496 		return -ENXIO;
497 	if (test_and_set_bit(LP_BUSY_BIT_POS, &LP_F(minor)))
498 		return -EBUSY;
499 
500 	/* If ABORTOPEN is set and the printer is offline or out of paper,
501 	   we may still want to open it to perform ioctl()s.  Therefore we
502 	   have commandeered O_NONBLOCK, even though it is being used in
503 	   a non-standard manner.  This is strictly a Linux hack, and
504 	   should most likely only ever be used by the tunelp application. */
505 	if ((LP_F(minor) & LP_ABORTOPEN) && !(file->f_flags & O_NONBLOCK)) {
506 		int status;
507 		lp_claim_parport_or_block (&lp_table[minor]);
508 		status = r_str(minor);
509 		lp_release_parport (&lp_table[minor]);
510 		if (status & LP_POUTPA) {
511 			printk(KERN_INFO "lp%d out of paper\n", minor);
512 			LP_F(minor) &= ~LP_BUSY;
513 			return -ENOSPC;
514 		} else if (!(status & LP_PSELECD)) {
515 			printk(KERN_INFO "lp%d off-line\n", minor);
516 			LP_F(minor) &= ~LP_BUSY;
517 			return -EIO;
518 		} else if (!(status & LP_PERRORP)) {
519 			printk(KERN_ERR "lp%d printer error\n", minor);
520 			LP_F(minor) &= ~LP_BUSY;
521 			return -EIO;
522 		}
523 	}
524 	lp_table[minor].lp_buffer = kmalloc(LP_BUFFER_SIZE, GFP_KERNEL);
525 	if (!lp_table[minor].lp_buffer) {
526 		LP_F(minor) &= ~LP_BUSY;
527 		return -ENOMEM;
528 	}
529 	/* Determine if the peripheral supports ECP mode */
530 	lp_claim_parport_or_block (&lp_table[minor]);
531 	if ( (lp_table[minor].dev->port->modes & PARPORT_MODE_ECP) &&
532              !parport_negotiate (lp_table[minor].dev->port,
533                                  IEEE1284_MODE_ECP)) {
534 		printk (KERN_INFO "lp%d: ECP mode\n", minor);
535 		lp_table[minor].best_mode = IEEE1284_MODE_ECP;
536 	} else {
537 		lp_table[minor].best_mode = IEEE1284_MODE_COMPAT;
538 	}
539 	/* Leave peripheral in compatibility mode */
540 	parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
541 	lp_release_parport (&lp_table[minor]);
542 	lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
543 	return 0;
544 }
545 
546 static int lp_release(struct inode * inode, struct file * file)
547 {
548 	unsigned int minor = iminor(inode);
549 
550 	lp_claim_parport_or_block (&lp_table[minor]);
551 	parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
552 	lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
553 	lp_release_parport (&lp_table[minor]);
554 	kfree(lp_table[minor].lp_buffer);
555 	lp_table[minor].lp_buffer = NULL;
556 	LP_F(minor) &= ~LP_BUSY;
557 	return 0;
558 }
559 
560 static int lp_ioctl(struct inode *inode, struct file *file,
561 		    unsigned int cmd, unsigned long arg)
562 {
563 	unsigned int minor = iminor(inode);
564 	int status;
565 	int retval = 0;
566 	void __user *argp = (void __user *)arg;
567 
568 #ifdef LP_DEBUG
569 	printk(KERN_DEBUG "lp%d ioctl, cmd: 0x%x, arg: 0x%lx\n", minor, cmd, arg);
570 #endif
571 	if (minor >= LP_NO)
572 		return -ENODEV;
573 	if ((LP_F(minor) & LP_EXIST) == 0)
574 		return -ENODEV;
575 	switch ( cmd ) {
576 		struct timeval par_timeout;
577 		long to_jiffies;
578 
579 		case LPTIME:
580 			LP_TIME(minor) = arg * HZ/100;
581 			break;
582 		case LPCHAR:
583 			LP_CHAR(minor) = arg;
584 			break;
585 		case LPABORT:
586 			if (arg)
587 				LP_F(minor) |= LP_ABORT;
588 			else
589 				LP_F(minor) &= ~LP_ABORT;
590 			break;
591 		case LPABORTOPEN:
592 			if (arg)
593 				LP_F(minor) |= LP_ABORTOPEN;
594 			else
595 				LP_F(minor) &= ~LP_ABORTOPEN;
596 			break;
597 		case LPCAREFUL:
598 			if (arg)
599 				LP_F(minor) |= LP_CAREFUL;
600 			else
601 				LP_F(minor) &= ~LP_CAREFUL;
602 			break;
603 		case LPWAIT:
604 			LP_WAIT(minor) = arg;
605 			break;
606 		case LPSETIRQ:
607 			return -EINVAL;
608 			break;
609 		case LPGETIRQ:
610 			if (copy_to_user(argp, &LP_IRQ(minor),
611 					sizeof(int)))
612 				return -EFAULT;
613 			break;
614 		case LPGETSTATUS:
615 			lp_claim_parport_or_block (&lp_table[minor]);
616 			status = r_str(minor);
617 			lp_release_parport (&lp_table[minor]);
618 
619 			if (copy_to_user(argp, &status, sizeof(int)))
620 				return -EFAULT;
621 			break;
622 		case LPRESET:
623 			lp_reset(minor);
624 			break;
625 #ifdef LP_STATS
626 		case LPGETSTATS:
627 			if (copy_to_user(argp, &LP_STAT(minor),
628 					sizeof(struct lp_stats)))
629 				return -EFAULT;
630 			if (capable(CAP_SYS_ADMIN))
631 				memset(&LP_STAT(minor), 0,
632 						sizeof(struct lp_stats));
633 			break;
634 #endif
635  		case LPGETFLAGS:
636  			status = LP_F(minor);
637 			if (copy_to_user(argp, &status, sizeof(int)))
638 				return -EFAULT;
639 			break;
640 
641 		case LPSETTIMEOUT:
642 			if (copy_from_user (&par_timeout, argp,
643 					    sizeof (struct timeval))) {
644 				return -EFAULT;
645 			}
646 			/* Convert to jiffies, place in lp_table */
647 			if ((par_timeout.tv_sec < 0) ||
648 			    (par_timeout.tv_usec < 0)) {
649 				return -EINVAL;
650 			}
651 			to_jiffies = DIV_ROUND_UP(par_timeout.tv_usec, 1000000/HZ);
652 			to_jiffies += par_timeout.tv_sec * (long) HZ;
653 			if (to_jiffies <= 0) {
654 				return -EINVAL;
655 			}
656 			lp_table[minor].timeout = to_jiffies;
657 			break;
658 
659 		default:
660 			retval = -EINVAL;
661 	}
662 	return retval;
663 }
664 
665 static const struct file_operations lp_fops = {
666 	.owner		= THIS_MODULE,
667 	.write		= lp_write,
668 	.ioctl		= lp_ioctl,
669 	.open		= lp_open,
670 	.release	= lp_release,
671 #ifdef CONFIG_PARPORT_1284
672 	.read		= lp_read,
673 #endif
674 };
675 
676 /* --- support for console on the line printer ----------------- */
677 
678 #ifdef CONFIG_LP_CONSOLE
679 
680 #define CONSOLE_LP 0
681 
682 /* If the printer is out of paper, we can either lose the messages or
683  * stall until the printer is happy again.  Define CONSOLE_LP_STRICT
684  * non-zero to get the latter behaviour. */
685 #define CONSOLE_LP_STRICT 1
686 
687 /* The console must be locked when we get here. */
688 
689 static void lp_console_write (struct console *co, const char *s,
690 			      unsigned count)
691 {
692 	struct pardevice *dev = lp_table[CONSOLE_LP].dev;
693 	struct parport *port = dev->port;
694 	ssize_t written;
695 
696 	if (parport_claim (dev))
697 		/* Nothing we can do. */
698 		return;
699 
700 	parport_set_timeout (dev, 0);
701 
702 	/* Go to compatibility mode. */
703 	parport_negotiate (port, IEEE1284_MODE_COMPAT);
704 
705 	do {
706 		/* Write the data, converting LF->CRLF as we go. */
707 		ssize_t canwrite = count;
708 		char *lf = memchr (s, '\n', count);
709 		if (lf)
710 			canwrite = lf - s;
711 
712 		if (canwrite > 0) {
713 			written = parport_write (port, s, canwrite);
714 
715 			if (written <= 0)
716 				continue;
717 
718 			s += written;
719 			count -= written;
720 			canwrite -= written;
721 		}
722 
723 		if (lf && canwrite <= 0) {
724 			const char *crlf = "\r\n";
725 			int i = 2;
726 
727 			/* Dodge the original '\n', and put '\r\n' instead. */
728 			s++;
729 			count--;
730 			do {
731 				written = parport_write (port, crlf, i);
732 				if (written > 0)
733 					i -= written, crlf += written;
734 			} while (i > 0 && (CONSOLE_LP_STRICT || written > 0));
735 		}
736 	} while (count > 0 && (CONSOLE_LP_STRICT || written > 0));
737 
738 	parport_release (dev);
739 }
740 
741 static struct console lpcons = {
742 	.name		= "lp",
743 	.write		= lp_console_write,
744 	.flags		= CON_PRINTBUFFER,
745 };
746 
747 #endif /* console on line printer */
748 
749 /* --- initialisation code ------------------------------------- */
750 
751 static int parport_nr[LP_NO] = { [0 ... LP_NO-1] = LP_PARPORT_UNSPEC };
752 static char *parport[LP_NO];
753 static int reset;
754 
755 module_param_array(parport, charp, NULL, 0);
756 module_param(reset, bool, 0);
757 
758 #ifndef MODULE
759 static int __init lp_setup (char *str)
760 {
761 	static int parport_ptr;
762 	int x;
763 
764 	if (get_option(&str, &x)) {
765 		if (x == 0) {
766 			/* disable driver on "lp=" or "lp=0" */
767 			parport_nr[0] = LP_PARPORT_OFF;
768 		} else {
769 			printk(KERN_WARNING "warning: 'lp=0x%x' is deprecated, ignored\n", x);
770 			return 0;
771 		}
772 	} else if (!strncmp(str, "parport", 7)) {
773 		int n = simple_strtoul(str+7, NULL, 10);
774 		if (parport_ptr < LP_NO)
775 			parport_nr[parport_ptr++] = n;
776 		else
777 			printk(KERN_INFO "lp: too many ports, %s ignored.\n",
778 			       str);
779 	} else if (!strcmp(str, "auto")) {
780 		parport_nr[0] = LP_PARPORT_AUTO;
781 	} else if (!strcmp(str, "none")) {
782 		parport_nr[parport_ptr++] = LP_PARPORT_NONE;
783 	} else if (!strcmp(str, "reset")) {
784 		reset = 1;
785 	}
786 	return 1;
787 }
788 #endif
789 
790 static int lp_register(int nr, struct parport *port)
791 {
792 	lp_table[nr].dev = parport_register_device(port, "lp",
793 						   lp_preempt, NULL, NULL, 0,
794 						   (void *) &lp_table[nr]);
795 	if (lp_table[nr].dev == NULL)
796 		return 1;
797 	lp_table[nr].flags |= LP_EXIST;
798 
799 	if (reset)
800 		lp_reset(nr);
801 
802 	device_create(lp_class, port->dev, MKDEV(LP_MAJOR, nr), "lp%d", nr);
803 
804 	printk(KERN_INFO "lp%d: using %s (%s).\n", nr, port->name,
805 	       (port->irq == PARPORT_IRQ_NONE)?"polling":"interrupt-driven");
806 
807 #ifdef CONFIG_LP_CONSOLE
808 	if (!nr) {
809 		if (port->modes & PARPORT_MODE_SAFEININT) {
810 			register_console(&lpcons);
811 			console_registered = port;
812 			printk (KERN_INFO "lp%d: console ready\n", CONSOLE_LP);
813 		} else
814 			printk (KERN_ERR "lp%d: cannot run console on %s\n",
815 				CONSOLE_LP, port->name);
816 	}
817 #endif
818 
819 	return 0;
820 }
821 
822 static void lp_attach (struct parport *port)
823 {
824 	unsigned int i;
825 
826 	switch (parport_nr[0]) {
827 	case LP_PARPORT_UNSPEC:
828 	case LP_PARPORT_AUTO:
829 		if (parport_nr[0] == LP_PARPORT_AUTO &&
830 		    port->probe_info[0].class != PARPORT_CLASS_PRINTER)
831 			return;
832 		if (lp_count == LP_NO) {
833 			printk(KERN_INFO "lp: ignoring parallel port (max. %d)\n",LP_NO);
834 			return;
835 		}
836 		if (!lp_register(lp_count, port))
837 			lp_count++;
838 		break;
839 
840 	default:
841 		for (i = 0; i < LP_NO; i++) {
842 			if (port->number == parport_nr[i]) {
843 				if (!lp_register(i, port))
844 					lp_count++;
845 				break;
846 			}
847 		}
848 		break;
849 	}
850 }
851 
852 static void lp_detach (struct parport *port)
853 {
854 	/* Write this some day. */
855 #ifdef CONFIG_LP_CONSOLE
856 	if (console_registered == port) {
857 		unregister_console(&lpcons);
858 		console_registered = NULL;
859 	}
860 #endif /* CONFIG_LP_CONSOLE */
861 }
862 
863 static struct parport_driver lp_driver = {
864 	.name = "lp",
865 	.attach = lp_attach,
866 	.detach = lp_detach,
867 };
868 
869 static int __init lp_init (void)
870 {
871 	int i, err = 0;
872 
873 	if (parport_nr[0] == LP_PARPORT_OFF)
874 		return 0;
875 
876 	for (i = 0; i < LP_NO; i++) {
877 		lp_table[i].dev = NULL;
878 		lp_table[i].flags = 0;
879 		lp_table[i].chars = LP_INIT_CHAR;
880 		lp_table[i].time = LP_INIT_TIME;
881 		lp_table[i].wait = LP_INIT_WAIT;
882 		lp_table[i].lp_buffer = NULL;
883 #ifdef LP_STATS
884 		lp_table[i].lastcall = 0;
885 		lp_table[i].runchars = 0;
886 		memset (&lp_table[i].stats, 0, sizeof (struct lp_stats));
887 #endif
888 		lp_table[i].last_error = 0;
889 		init_waitqueue_head (&lp_table[i].waitq);
890 		init_waitqueue_head (&lp_table[i].dataq);
891 		mutex_init(&lp_table[i].port_mutex);
892 		lp_table[i].timeout = 10 * HZ;
893 	}
894 
895 	if (register_chrdev (LP_MAJOR, "lp", &lp_fops)) {
896 		printk (KERN_ERR "lp: unable to get major %d\n", LP_MAJOR);
897 		return -EIO;
898 	}
899 
900 	lp_class = class_create(THIS_MODULE, "printer");
901 	if (IS_ERR(lp_class)) {
902 		err = PTR_ERR(lp_class);
903 		goto out_reg;
904 	}
905 
906 	if (parport_register_driver (&lp_driver)) {
907 		printk (KERN_ERR "lp: unable to register with parport\n");
908 		err = -EIO;
909 		goto out_class;
910 	}
911 
912 	if (!lp_count) {
913 		printk (KERN_INFO "lp: driver loaded but no devices found\n");
914 #ifndef CONFIG_PARPORT_1284
915 		if (parport_nr[0] == LP_PARPORT_AUTO)
916 			printk (KERN_INFO "lp: (is IEEE 1284 support enabled?)\n");
917 #endif
918 	}
919 
920 	return 0;
921 
922 out_class:
923 	class_destroy(lp_class);
924 out_reg:
925 	unregister_chrdev(LP_MAJOR, "lp");
926 	return err;
927 }
928 
929 static int __init lp_init_module (void)
930 {
931 	if (parport[0]) {
932 		/* The user gave some parameters.  Let's see what they were.  */
933 		if (!strncmp(parport[0], "auto", 4))
934 			parport_nr[0] = LP_PARPORT_AUTO;
935 		else {
936 			int n;
937 			for (n = 0; n < LP_NO && parport[n]; n++) {
938 				if (!strncmp(parport[n], "none", 4))
939 					parport_nr[n] = LP_PARPORT_NONE;
940 				else {
941 					char *ep;
942 					unsigned long r = simple_strtoul(parport[n], &ep, 0);
943 					if (ep != parport[n])
944 						parport_nr[n] = r;
945 					else {
946 						printk(KERN_ERR "lp: bad port specifier `%s'\n", parport[n]);
947 						return -ENODEV;
948 					}
949 				}
950 			}
951 		}
952 	}
953 
954 	return lp_init();
955 }
956 
957 static void lp_cleanup_module (void)
958 {
959 	unsigned int offset;
960 
961 	parport_unregister_driver (&lp_driver);
962 
963 #ifdef CONFIG_LP_CONSOLE
964 	unregister_console (&lpcons);
965 #endif
966 
967 	unregister_chrdev(LP_MAJOR, "lp");
968 	for (offset = 0; offset < LP_NO; offset++) {
969 		if (lp_table[offset].dev == NULL)
970 			continue;
971 		parport_unregister_device(lp_table[offset].dev);
972 		device_destroy(lp_class, MKDEV(LP_MAJOR, offset));
973 	}
974 	class_destroy(lp_class);
975 }
976 
977 __setup("lp=", lp_setup);
978 module_init(lp_init_module);
979 module_exit(lp_cleanup_module);
980 
981 MODULE_ALIAS_CHARDEV_MAJOR(LP_MAJOR);
982 MODULE_LICENSE("GPL");
983