File: /usr/src/linux/drivers/char/lp.c
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 <Philip.Blundell@pobox.com>
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
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 /* ROUND_UP macro from fs/select.c */
142 #define ROUND_UP(x,y) (((x)+(y)-1)/(y))
143
144 static devfs_handle_t devfs_handle = NULL;
145
146 struct lp_struct lp_table[LP_NO];
147
148 static unsigned int lp_count = 0;
149
150 #ifdef CONFIG_LP_CONSOLE
151 static struct parport *console_registered; // initially NULL
152 #endif /* CONFIG_LP_CONSOLE */
153
154 #undef LP_DEBUG
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 static int lp_reset(int minor)
164 {
165 int retval;
166 parport_claim_or_block (lp_table[minor].dev);
167 w_ctr(minor, LP_PSELECP);
168 udelay (LP_DELAY);
169 w_ctr(minor, LP_PSELECP | LP_PINITP);
170 retval = r_str(minor);
171 parport_release (lp_table[minor].dev);
172 return retval;
173 }
174
175 static void lp_error (int minor)
176 {
177 int polling;
178
179 if (LP_F(minor) & LP_ABORT)
180 return;
181
182 polling = lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE;
183 if (polling) parport_release (lp_table[minor].dev);
184 interruptible_sleep_on_timeout (&lp_table[minor].waitq,
185 LP_TIMEOUT_POLLED);
186 if (polling) parport_claim_or_block (lp_table[minor].dev);
187 else parport_yield_blocking (lp_table[minor].dev);
188 }
189
190 static int lp_check_status(int minor)
191 {
192 int error = 0;
193 unsigned int last = lp_table[minor].last_error;
194 unsigned char status = r_str(minor);
195 if ((status & LP_PERRORP) && !(LP_F(minor) & LP_CAREFUL))
196 /* No error. */
197 last = 0;
198 else if ((status & LP_POUTPA)) {
199 if (last != LP_POUTPA) {
200 last = LP_POUTPA;
201 printk(KERN_INFO "lp%d out of paper\n", minor);
202 }
203 error = -ENOSPC;
204 } else if (!(status & LP_PSELECD)) {
205 if (last != LP_PSELECD) {
206 last = LP_PSELECD;
207 printk(KERN_INFO "lp%d off-line\n", minor);
208 }
209 error = -EIO;
210 } else if (!(status & LP_PERRORP)) {
211 if (last != LP_PERRORP) {
212 last = LP_PERRORP;
213 printk(KERN_INFO "lp%d on fire\n", minor);
214 }
215 error = -EIO;
216 } else {
217 last = 0; /* Come here if LP_CAREFUL is set and no
218 errors are reported. */
219 }
220
221 lp_table[minor].last_error = last;
222
223 if (last != 0)
224 lp_error(minor);
225
226 return error;
227 }
228
229 static int lp_wait_ready(int minor)
230 {
231 int error = 0;
232 do {
233 error = lp_check_status (minor);
234 if (error && (LP_F(minor) & LP_ABORT))
235 break;
236 if (signal_pending (current)) {
237 error = -EINTR;
238 break;
239 }
240 } while (error);
241 return error;
242 }
243
244 static ssize_t lp_write(struct file * file, const char * buf,
245 size_t count, loff_t *ppos)
246 {
247 unsigned int minor = MINOR(file->f_dentry->d_inode->i_rdev);
248 struct parport *port = lp_table[minor].dev->port;
249 char *kbuf = lp_table[minor].lp_buffer;
250 ssize_t retv = 0;
251 ssize_t written;
252 size_t copy_size = count;
253
254 #ifdef LP_STATS
255 if (jiffies-lp_table[minor].lastcall > LP_TIME(minor))
256 lp_table[minor].runchars = 0;
257
258 lp_table[minor].lastcall = jiffies;
259 #endif
260
261 /* Need to copy the data from user-space. */
262 if (copy_size > LP_BUFFER_SIZE)
263 copy_size = LP_BUFFER_SIZE;
264
265 if (copy_from_user (kbuf, buf, copy_size))
266 return -EFAULT;
267
268 if (down_interruptible (&lp_table[minor].port_mutex))
269 return -EINTR;
270
271 /* Claim Parport or sleep until it becomes available
272 */
273 parport_claim_or_block (lp_table[minor].dev);
274
275 /* Go to compatibility mode. */
276 parport_negotiate (port, IEEE1284_MODE_COMPAT);
277
278 parport_set_timeout (lp_table[minor].dev,
279 lp_table[minor].timeout);
280
281 if ((retv = lp_wait_ready (minor)) == 0)
282 do {
283 /* Write the data. */
284 written = parport_write (port, kbuf, copy_size);
285 if (written >= 0) {
286 copy_size -= written;
287 count -= written;
288 buf += written;
289 retv += written;
290 }
291
292 if (signal_pending (current)) {
293 if (retv == 0)
294 retv = -EINTR;
295
296 break;
297 }
298
299 if (copy_size > 0) {
300 /* incomplete write -> check error ! */
301 int error = lp_wait_ready (minor);
302
303 if (error) {
304 if (retv == 0)
305 retv = error;
306 break;
307 }
308
309 parport_yield_blocking (lp_table[minor].dev);
310 } else if (current->need_resched)
311 schedule ();
312
313 if (count) {
314 copy_size = count;
315 if (copy_size > LP_BUFFER_SIZE)
316 copy_size = LP_BUFFER_SIZE;
317
318 if (copy_from_user(kbuf, buf, copy_size)) {
319 if (retv == 0)
320 retv = -EFAULT;
321 break;
322 }
323 }
324 } while (count > 0);
325
326 parport_release (lp_table[minor].dev);
327
328 up (&lp_table[minor].port_mutex);
329
330 return retv;
331 }
332
333 #ifdef CONFIG_PARPORT_1284
334
335 /* Status readback conforming to ieee1284 */
336 static ssize_t lp_read(struct file * file, char * buf,
337 size_t count, loff_t *ppos)
338 {
339 unsigned int minor=MINOR(file->f_dentry->d_inode->i_rdev);
340 struct parport *port = lp_table[minor].dev->port;
341 ssize_t retval = 0;
342 char *kbuf = lp_table[minor].lp_buffer;
343
344 if (count > LP_BUFFER_SIZE)
345 count = LP_BUFFER_SIZE;
346
347 if (down_interruptible (&lp_table[minor].port_mutex))
348 return -EINTR;
349
350 parport_claim_or_block (lp_table[minor].dev);
351 retval = parport_read (port, kbuf, count);
352 parport_release (lp_table[minor].dev);
353
354 if (retval > 0 && copy_to_user (buf, kbuf, retval))
355 retval = -EFAULT;
356
357 up (&lp_table[minor].port_mutex);
358
359 return retval;
360 }
361
362 #endif /* IEEE 1284 support */
363
364 static int lp_open(struct inode * inode, struct file * file)
365 {
366 unsigned int minor = MINOR(inode->i_rdev);
367
368 if (minor >= LP_NO)
369 return -ENXIO;
370 if ((LP_F(minor) & LP_EXIST) == 0)
371 return -ENXIO;
372 if (test_and_set_bit(LP_BUSY_BIT_POS, &LP_F(minor)))
373 return -EBUSY;
374
375 /* If ABORTOPEN is set and the printer is offline or out of paper,
376 we may still want to open it to perform ioctl()s. Therefore we
377 have commandeered O_NONBLOCK, even though it is being used in
378 a non-standard manner. This is strictly a Linux hack, and
379 should most likely only ever be used by the tunelp application. */
380 if ((LP_F(minor) & LP_ABORTOPEN) && !(file->f_flags & O_NONBLOCK)) {
381 int status;
382 parport_claim_or_block (lp_table[minor].dev);
383 status = r_str(minor);
384 parport_release (lp_table[minor].dev);
385 if (status & LP_POUTPA) {
386 printk(KERN_INFO "lp%d out of paper\n", minor);
387 LP_F(minor) &= ~LP_BUSY;
388 return -ENOSPC;
389 } else if (!(status & LP_PSELECD)) {
390 printk(KERN_INFO "lp%d off-line\n", minor);
391 LP_F(minor) &= ~LP_BUSY;
392 return -EIO;
393 } else if (!(status & LP_PERRORP)) {
394 printk(KERN_ERR "lp%d printer error\n", minor);
395 LP_F(minor) &= ~LP_BUSY;
396 return -EIO;
397 }
398 }
399 lp_table[minor].lp_buffer = (char *) kmalloc(LP_BUFFER_SIZE, GFP_KERNEL);
400 if (!lp_table[minor].lp_buffer) {
401 LP_F(minor) &= ~LP_BUSY;
402 return -ENOMEM;
403 }
404 return 0;
405 }
406
407 static int lp_release(struct inode * inode, struct file * file)
408 {
409 unsigned int minor = MINOR(inode->i_rdev);
410
411 lock_kernel();
412 kfree(lp_table[minor].lp_buffer);
413 lp_table[minor].lp_buffer = NULL;
414 LP_F(minor) &= ~LP_BUSY;
415 unlock_kernel();
416 return 0;
417 }
418
419 static int lp_ioctl(struct inode *inode, struct file *file,
420 unsigned int cmd, unsigned long arg)
421 {
422 unsigned int minor = MINOR(inode->i_rdev);
423 int status;
424 int retval = 0;
425
426 #ifdef LP_DEBUG
427 printk(KERN_DEBUG "lp%d ioctl, cmd: 0x%x, arg: 0x%lx\n", minor, cmd, arg);
428 #endif
429 if (minor >= LP_NO)
430 return -ENODEV;
431 if ((LP_F(minor) & LP_EXIST) == 0)
432 return -ENODEV;
433 switch ( cmd ) {
434 struct timeval par_timeout;
435 long to_jiffies;
436
437 case LPTIME:
438 LP_TIME(minor) = arg * HZ/100;
439 break;
440 case LPCHAR:
441 LP_CHAR(minor) = arg;
442 break;
443 case LPABORT:
444 if (arg)
445 LP_F(minor) |= LP_ABORT;
446 else
447 LP_F(minor) &= ~LP_ABORT;
448 break;
449 case LPABORTOPEN:
450 if (arg)
451 LP_F(minor) |= LP_ABORTOPEN;
452 else
453 LP_F(minor) &= ~LP_ABORTOPEN;
454 break;
455 case LPCAREFUL:
456 if (arg)
457 LP_F(minor) |= LP_CAREFUL;
458 else
459 LP_F(minor) &= ~LP_CAREFUL;
460 break;
461 case LPWAIT:
462 LP_WAIT(minor) = arg;
463 break;
464 case LPSETIRQ:
465 return -EINVAL;
466 break;
467 case LPGETIRQ:
468 if (copy_to_user((int *) arg, &LP_IRQ(minor),
469 sizeof(int)))
470 return -EFAULT;
471 break;
472 case LPGETSTATUS:
473 parport_claim_or_block (lp_table[minor].dev);
474 status = r_str(minor);
475 parport_release (lp_table[minor].dev);
476
477 if (copy_to_user((int *) arg, &status, sizeof(int)))
478 return -EFAULT;
479 break;
480 case LPRESET:
481 lp_reset(minor);
482 break;
483 #ifdef LP_STATS
484 case LPGETSTATS:
485 if (copy_to_user((int *) arg, &LP_STAT(minor),
486 sizeof(struct lp_stats)))
487 return -EFAULT;
488 if (capable(CAP_SYS_ADMIN))
489 memset(&LP_STAT(minor), 0,
490 sizeof(struct lp_stats));
491 break;
492 #endif
493 case LPGETFLAGS:
494 status = LP_F(minor);
495 if (copy_to_user((int *) arg, &status, sizeof(int)))
496 return -EFAULT;
497 break;
498
499 case LPSETTIMEOUT:
500 if (copy_from_user (&par_timeout,
501 (struct timeval *) arg,
502 sizeof (struct timeval))) {
503 return -EFAULT;
504 }
505 /* Convert to jiffies, place in lp_table */
506 if ((par_timeout.tv_sec < 0) ||
507 (par_timeout.tv_usec < 0)) {
508 return -EINVAL;
509 }
510 to_jiffies = ROUND_UP(par_timeout.tv_usec, 1000000/HZ);
511 to_jiffies += par_timeout.tv_sec * (long) HZ;
512 if (to_jiffies <= 0) {
513 return -EINVAL;
514 }
515 lp_table[minor].timeout = to_jiffies;
516 break;
517
518 default:
519 retval = -EINVAL;
520 }
521 return retval;
522 }
523
524 static struct file_operations lp_fops = {
525 owner: THIS_MODULE,
526 write: lp_write,
527 ioctl: lp_ioctl,
528 open: lp_open,
529 release: lp_release,
530 #ifdef CONFIG_PARPORT_1284
531 read: lp_read,
532 #endif
533 };
534
535 /* --- support for console on the line printer ----------------- */
536
537 #ifdef CONFIG_LP_CONSOLE
538
539 #define CONSOLE_LP 0
540
541 /* If the printer is out of paper, we can either lose the messages or
542 * stall until the printer is happy again. Define CONSOLE_LP_STRICT
543 * non-zero to get the latter behaviour. */
544 #define CONSOLE_LP_STRICT 1
545
546 /* The console must be locked when we get here. */
547
548 static void lp_console_write (struct console *co, const char *s,
549 unsigned count)
550 {
551 struct pardevice *dev = lp_table[CONSOLE_LP].dev;
552 struct parport *port = dev->port;
553 ssize_t written;
554
555 if (parport_claim (dev))
556 /* Nothing we can do. */
557 return;
558
559 parport_set_timeout (dev, 0);
560
561 /* Go to compatibility mode. */
562 parport_negotiate (port, IEEE1284_MODE_COMPAT);
563
564 do {
565 /* Write the data, converting LF->CRLF as we go. */
566 ssize_t canwrite = count;
567 char *lf = strchr (s, '\n');
568 if (lf)
569 canwrite = lf - s;
570
571 if (canwrite > 0) {
572 written = parport_write (port, s, canwrite);
573
574 if (written <= 0)
575 continue;
576
577 s += written;
578 count -= written;
579 canwrite -= written;
580 }
581
582 if (lf && canwrite <= 0) {
583 const char *crlf = "\r\n";
584 int i = 2;
585
586 /* Dodge the original '\n', and put '\r\n' instead. */
587 s++;
588 count--;
589 do {
590 written = parport_write (port, crlf, i);
591 if (written > 0)
592 i -= written, crlf += written;
593 } while (i > 0 && (CONSOLE_LP_STRICT || written > 0));
594 }
595 } while (count > 0 && (CONSOLE_LP_STRICT || written > 0));
596
597 parport_release (dev);
598 }
599
600 static kdev_t lp_console_device (struct console *c)
601 {
602 return MKDEV(LP_MAJOR, CONSOLE_LP);
603 }
604
605 static struct console lpcons = {
606 name: "lp",
607 write: lp_console_write,
608 device: lp_console_device,
609 flags: CON_PRINTBUFFER,
610 };
611
612 #endif /* console on line printer */
613
614 /* --- initialisation code ------------------------------------- */
615
616 static int parport_nr[LP_NO] = { [0 ... LP_NO-1] = LP_PARPORT_UNSPEC };
617 static char *parport[LP_NO] = { NULL, };
618 static int reset = 0;
619
620 MODULE_PARM(parport, "1-" __MODULE_STRING(LP_NO) "s");
621 MODULE_PARM(reset, "i");
622
623 #ifndef MODULE
624 static int __init lp_setup (char *str)
625 {
626 static int parport_ptr; // initially zero
627 int x;
628
629 if (get_option (&str, &x)) {
630 if (x == 0) {
631 /* disable driver on "lp=" or "lp=0" */
632 parport_nr[0] = LP_PARPORT_OFF;
633 } else {
634 printk(KERN_WARNING "warning: 'lp=0x%x' is deprecated, ignored\n", x);
635 return 0;
636 }
637 } else if (!strncmp(str, "parport", 7)) {
638 int n = simple_strtoul(str+7, NULL, 10);
639 if (parport_ptr < LP_NO)
640 parport_nr[parport_ptr++] = n;
641 else
642 printk(KERN_INFO "lp: too many ports, %s ignored.\n",
643 str);
644 } else if (!strcmp(str, "auto")) {
645 parport_nr[0] = LP_PARPORT_AUTO;
646 } else if (!strcmp(str, "none")) {
647 parport_nr[parport_ptr++] = LP_PARPORT_NONE;
648 } else if (!strcmp(str, "reset")) {
649 reset = 1;
650 }
651 return 1;
652 }
653 #endif
654
655 static int lp_register(int nr, struct parport *port)
656 {
657 char name[8];
658
659 lp_table[nr].dev = parport_register_device(port, "lp",
660 NULL, NULL, NULL, 0,
661 (void *) &lp_table[nr]);
662 if (lp_table[nr].dev == NULL)
663 return 1;
664 lp_table[nr].flags |= LP_EXIST;
665
666 if (reset)
667 lp_reset(nr);
668
669 sprintf (name, "%d", nr);
670 devfs_register (devfs_handle, name,
671 DEVFS_FL_DEFAULT, LP_MAJOR, nr,
672 S_IFCHR | S_IRUGO | S_IWUGO,
673 &lp_fops, NULL);
674
675 printk(KERN_INFO "lp%d: using %s (%s).\n", nr, port->name,
676 (port->irq == PARPORT_IRQ_NONE)?"polling":"interrupt-driven");
677
678 #ifdef CONFIG_LP_CONSOLE
679 if (!nr) {
680 if (port->modes & PARPORT_MODE_SAFEININT) {
681 register_console (&lpcons);
682 console_registered = port;
683 printk (KERN_INFO "lp%d: console ready\n", CONSOLE_LP);
684 } else
685 printk (KERN_ERR "lp%d: cannot run console on %s\n",
686 CONSOLE_LP, port->name);
687 }
688 #endif
689
690 return 0;
691 }
692
693 static void lp_attach (struct parport *port)
694 {
695 unsigned int i;
696
697 switch (parport_nr[0])
698 {
699 case LP_PARPORT_UNSPEC:
700 case LP_PARPORT_AUTO:
701 if (parport_nr[0] == LP_PARPORT_AUTO &&
702 port->probe_info[0].class != PARPORT_CLASS_PRINTER)
703 return;
704 if (lp_count == LP_NO) {
705 printk("lp: ignoring parallel port (max. %d)\n",LP_NO);
706 return;
707 }
708 if (!lp_register(lp_count, port))
709 lp_count++;
710 break;
711
712 default:
713 for (i = 0; i < LP_NO; i++) {
714 if (port->number == parport_nr[i]) {
715 if (!lp_register(i, port))
716 lp_count++;
717 break;
718 }
719 }
720 break;
721 }
722 }
723
724 static void lp_detach (struct parport *port)
725 {
726 /* Write this some day. */
727 #ifdef CONFIG_LP_CONSOLE
728 if (console_registered == port) {
729 unregister_console (&lpcons);
730 console_registered = NULL;
731 }
732 #endif /* CONFIG_LP_CONSOLE */
733 }
734
735 static struct parport_driver lp_driver = {
736 "lp",
737 lp_attach,
738 lp_detach,
739 NULL
740 };
741
742 int __init lp_init (void)
743 {
744 int i;
745
746 if (parport_nr[0] == LP_PARPORT_OFF)
747 return 0;
748
749 for (i = 0; i < LP_NO; i++) {
750 lp_table[i].dev = NULL;
751 lp_table[i].flags = 0;
752 lp_table[i].chars = LP_INIT_CHAR;
753 lp_table[i].time = LP_INIT_TIME;
754 lp_table[i].wait = LP_INIT_WAIT;
755 lp_table[i].lp_buffer = NULL;
756 #ifdef LP_STATS
757 lp_table[i].lastcall = 0;
758 lp_table[i].runchars = 0;
759 memset (&lp_table[i].stats, 0, sizeof (struct lp_stats));
760 #endif
761 lp_table[i].last_error = 0;
762 init_waitqueue_head (&lp_table[i].waitq);
763 init_waitqueue_head (&lp_table[i].dataq);
764 init_MUTEX (&lp_table[i].port_mutex);
765 lp_table[i].timeout = 10 * HZ;
766 }
767
768 if (devfs_register_chrdev (LP_MAJOR, "lp", &lp_fops)) {
769 printk ("lp: unable to get major %d\n", LP_MAJOR);
770 return -EIO;
771 }
772
773 devfs_handle = devfs_mk_dir (NULL, "printers", NULL);
774
775 if (parport_register_driver (&lp_driver)) {
776 printk ("lp: unable to register with parport\n");
777 return -EIO;
778 }
779
780 if (!lp_count) {
781 printk (KERN_INFO "lp: driver loaded but no devices found\n");
782 #ifndef CONFIG_PARPORT_1284
783 if (parport_nr[0] == LP_PARPORT_AUTO)
784 printk (KERN_INFO "lp: (is IEEE 1284 support enabled?)\n");
785 #endif
786 }
787
788 return 0;
789 }
790
791 static int __init lp_init_module (void)
792 {
793 if (parport[0]) {
794 /* The user gave some parameters. Let's see what they were. */
795 if (!strncmp(parport[0], "auto", 4))
796 parport_nr[0] = LP_PARPORT_AUTO;
797 else {
798 int n;
799 for (n = 0; n < LP_NO && parport[n]; n++) {
800 if (!strncmp(parport[n], "none", 4))
801 parport_nr[n] = LP_PARPORT_NONE;
802 else {
803 char *ep;
804 unsigned long r = simple_strtoul(parport[n], &ep, 0);
805 if (ep != parport[n])
806 parport_nr[n] = r;
807 else {
808 printk(KERN_ERR "lp: bad port specifier `%s'\n", parport[n]);
809 return -ENODEV;
810 }
811 }
812 }
813 }
814 }
815
816 return lp_init();
817 }
818
819 static void lp_cleanup_module (void)
820 {
821 unsigned int offset;
822
823 parport_unregister_driver (&lp_driver);
824
825 #ifdef CONFIG_LP_CONSOLE
826 unregister_console (&lpcons);
827 #endif
828
829 devfs_unregister (devfs_handle);
830 devfs_unregister_chrdev(LP_MAJOR, "lp");
831 for (offset = 0; offset < LP_NO; offset++) {
832 if (lp_table[offset].dev == NULL)
833 continue;
834 parport_unregister_device(lp_table[offset].dev);
835 }
836 }
837
838 __setup("lp=", lp_setup);
839 module_init(lp_init_module);
840 module_exit(lp_cleanup_module);
841
842 MODULE_LICENSE("GPL");
843 EXPORT_NO_SYMBOLS;
844