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/malloc.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 3 printers, remember to increase LP_NO */
139 #define LP_NO 3
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 #undef LP_DEBUG
151
152 /* --- low-level port access ----------------------------------- */
153
154 #define r_dtr(x) (parport_read_data(lp_table[(x)].dev->port))
155 #define r_str(x) (parport_read_status(lp_table[(x)].dev->port))
156 #define w_ctr(x,y) do { parport_write_control(lp_table[(x)].dev->port, (y)); } while (0)
157 #define w_dtr(x,y) do { parport_write_data(lp_table[(x)].dev->port, (y)); } while (0)
158
159 static int lp_reset(int minor)
160 {
161 int retval;
162 parport_claim_or_block (lp_table[minor].dev);
163 w_ctr(minor, LP_PSELECP);
164 udelay (LP_DELAY);
165 w_ctr(minor, LP_PSELECP | LP_PINITP);
166 retval = r_str(minor);
167 parport_release (lp_table[minor].dev);
168 return retval;
169 }
170
171 static void lp_error (int minor)
172 {
173 int polling;
174
175 if (LP_F(minor) & LP_ABORT)
176 return;
177
178 polling = lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE;
179 if (polling) parport_release (lp_table[minor].dev);
180 interruptible_sleep_on_timeout (&lp_table[minor].waitq,
181 LP_TIMEOUT_POLLED);
182 if (polling) parport_claim_or_block (lp_table[minor].dev);
183 else parport_yield_blocking (lp_table[minor].dev);
184 }
185
186 static int lp_check_status(int minor)
187 {
188 int error = 0;
189 unsigned int last = lp_table[minor].last_error;
190 unsigned char status = r_str(minor);
191 if ((status & LP_PERRORP) && !(LP_F(minor) & LP_CAREFUL))
192 /* No error. */
193 last = 0;
194 else if ((status & LP_POUTPA)) {
195 if (last != LP_POUTPA) {
196 last = LP_POUTPA;
197 printk(KERN_INFO "lp%d out of paper\n", minor);
198 }
199 error = -ENOSPC;
200 } else if (!(status & LP_PSELECD)) {
201 if (last != LP_PSELECD) {
202 last = LP_PSELECD;
203 printk(KERN_INFO "lp%d off-line\n", minor);
204 }
205 error = -EIO;
206 } else if (!(status & LP_PERRORP)) {
207 if (last != LP_PERRORP) {
208 last = LP_PERRORP;
209 printk(KERN_INFO "lp%d on fire\n", minor);
210 }
211 error = -EIO;
212 } else {
213 last = 0; /* Come here if LP_CAREFUL is set and no
214 errors are reported. */
215 }
216
217 lp_table[minor].last_error = last;
218
219 if (last != 0)
220 lp_error(minor);
221
222 return error;
223 }
224
225 static ssize_t lp_write(struct file * file, const char * buf,
226 size_t count, loff_t *ppos)
227 {
228 unsigned int minor = MINOR(file->f_dentry->d_inode->i_rdev);
229 struct parport *port = lp_table[minor].dev->port;
230 char *kbuf = lp_table[minor].lp_buffer;
231 ssize_t retv = 0;
232 ssize_t written;
233 size_t copy_size = count;
234
235 #ifdef LP_STATS
236 if (jiffies-lp_table[minor].lastcall > LP_TIME(minor))
237 lp_table[minor].runchars = 0;
238
239 lp_table[minor].lastcall = jiffies;
240 #endif
241
242 /* Need to copy the data from user-space. */
243 if (copy_size > LP_BUFFER_SIZE)
244 copy_size = LP_BUFFER_SIZE;
245
246 if (copy_from_user (kbuf, buf, copy_size))
247 return -EFAULT;
248
249 if (down_interruptible (&lp_table[minor].port_mutex))
250 return -EINTR;
251
252 /* Claim Parport or sleep until it becomes available
253 */
254 parport_claim_or_block (lp_table[minor].dev);
255
256 /* Go to compatibility mode. */
257 parport_negotiate (port, IEEE1284_MODE_COMPAT);
258
259 parport_set_timeout (lp_table[minor].dev,
260 lp_table[minor].timeout);
261
262 if ((retv = lp_check_status (minor)) == 0)
263 do {
264 /* Write the data. */
265 written = parport_write (port, kbuf, copy_size);
266 if (written >= 0) {
267 copy_size -= written;
268 count -= written;
269 buf += written;
270 retv += written;
271 }
272
273 if (signal_pending (current)) {
274 if (retv == 0)
275 retv = -EINTR;
276
277 break;
278 }
279
280 if (copy_size > 0) {
281 /* incomplete write -> check error ! */
282 int error = lp_check_status (minor);
283
284 if (LP_F(minor) & LP_ABORT) {
285 if (retv == 0)
286 retv = error;
287 break;
288 }
289
290 parport_yield_blocking (lp_table[minor].dev);
291 } else if (current->need_resched)
292 schedule ();
293
294 if (count) {
295 copy_size = count;
296 if (copy_size > LP_BUFFER_SIZE)
297 copy_size = LP_BUFFER_SIZE;
298
299 if (copy_from_user(kbuf, buf, copy_size)) {
300 if (retv == 0)
301 retv = -EFAULT;
302 break;
303 }
304 }
305 } while (count > 0);
306
307 parport_release (lp_table[minor].dev);
308
309 up (&lp_table[minor].port_mutex);
310
311 return retv;
312 }
313
314 #ifdef CONFIG_PARPORT_1284
315
316 /* Status readback conforming to ieee1284 */
317 static ssize_t lp_read(struct file * file, char * buf,
318 size_t count, loff_t *ppos)
319 {
320 unsigned int minor=MINOR(file->f_dentry->d_inode->i_rdev);
321 struct parport *port = lp_table[minor].dev->port;
322 ssize_t retval = 0;
323 char *kbuf = lp_table[minor].lp_buffer;
324
325 if (count > LP_BUFFER_SIZE)
326 count = LP_BUFFER_SIZE;
327
328 if (down_interruptible (&lp_table[minor].port_mutex))
329 return -EINTR;
330
331 parport_claim_or_block (lp_table[minor].dev);
332
333 for (;;) {
334 retval = parport_read (port, kbuf, count);
335
336 if (retval)
337 break;
338
339 if (file->f_flags & O_NONBLOCK)
340 break;
341
342 /* Wait for an interrupt. */
343 interruptible_sleep_on_timeout (&lp_table[minor].waitq,
344 LP_TIMEOUT_POLLED);
345
346 if (signal_pending (current)) {
347 retval = -EINTR;
348 break;
349 }
350 }
351
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 (suser())
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_lock must be held 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 #ifdef MODULE
617
618 static int parport_nr[LP_NO] = { [0 ... LP_NO-1] = LP_PARPORT_UNSPEC };
619 static char *parport[LP_NO] = { NULL, };
620 static int reset = 0;
621
622 MODULE_PARM(parport, "1-" __MODULE_STRING(LP_NO) "s");
623 MODULE_PARM(reset, "i");
624
625 #else
626
627 static int parport_nr[LP_NO] = { [0 ... LP_NO-1] = LP_PARPORT_UNSPEC };
628 static int reset = 0;
629
630 static int parport_ptr = 0;
631
632 void __init lp_setup(char *str, int *ints)
633 {
634 if (!str) {
635 if (ints[0] == 0 || ints[1] == 0) {
636 /* disable driver on "lp=" or "lp=0" */
637 parport_nr[0] = LP_PARPORT_OFF;
638 } else {
639 printk(KERN_WARNING "warning: 'lp=0x%x' is deprecated, ignored\n", ints[1]);
640 }
641 } else if (!strncmp(str, "parport", 7)) {
642 int n = simple_strtoul(str+7, NULL, 10);
643 if (parport_ptr < LP_NO)
644 parport_nr[parport_ptr++] = n;
645 else
646 printk(KERN_INFO "lp: too many ports, %s ignored.\n",
647 str);
648 } else if (!strcmp(str, "auto")) {
649 parport_nr[0] = LP_PARPORT_AUTO;
650 } else if (!strcmp(str, "none")) {
651 parport_nr[parport_ptr++] = LP_PARPORT_NONE;
652 } else if (!strcmp(str, "reset")) {
653 reset = 1;
654 }
655 }
656
657 #endif
658
659 static int lp_register(int nr, struct parport *port)
660 {
661 char name[8];
662
663 lp_table[nr].dev = parport_register_device(port, "lp",
664 NULL, NULL, NULL, 0,
665 (void *) &lp_table[nr]);
666 if (lp_table[nr].dev == NULL)
667 return 1;
668 lp_table[nr].flags |= LP_EXIST;
669
670 if (reset)
671 lp_reset(nr);
672
673 sprintf (name, "%d", nr);
674 devfs_register (devfs_handle, name,
675 DEVFS_FL_DEFAULT, LP_MAJOR, nr,
676 S_IFCHR | S_IRUGO | S_IWUGO,
677 &lp_fops, NULL);
678
679 printk(KERN_INFO "lp%d: using %s (%s).\n", nr, port->name,
680 (port->irq == PARPORT_IRQ_NONE)?"polling":"interrupt-driven");
681
682 #ifdef CONFIG_LP_CONSOLE
683 if (!nr) {
684 if (port->modes & PARPORT_MODE_SAFEININT) {
685 MOD_INC_USE_COUNT;
686 register_console (&lpcons);
687 printk (KERN_INFO "lp%d: console ready\n", CONSOLE_LP);
688 } else
689 printk (KERN_ERR "lp%d: cannot run console on %s\n",
690 CONSOLE_LP, port->name);
691 }
692 #endif
693
694 return 0;
695 }
696
697 static void lp_attach (struct parport *port)
698 {
699 unsigned int i;
700
701 switch (parport_nr[0])
702 {
703 case LP_PARPORT_UNSPEC:
704 case LP_PARPORT_AUTO:
705 if (parport_nr[0] == LP_PARPORT_AUTO &&
706 port->probe_info[0].class != PARPORT_CLASS_PRINTER)
707 return;
708 if (lp_count == LP_NO) {
709 printk("lp: ignoring parallel port (max. %d)\n",LP_NO);
710 return;
711 }
712 if (!lp_register(lp_count, port))
713 lp_count++;
714 break;
715
716 default:
717 for (i = 0; i < LP_NO; i++) {
718 if (port->number == parport_nr[i]) {
719 if (!lp_register(i, port))
720 lp_count++;
721 break;
722 }
723 }
724 break;
725 }
726 }
727
728 static void lp_detach (struct parport *port)
729 {
730 /* Write this some day. */
731 }
732
733 static struct parport_driver lp_driver = {
734 "lp",
735 lp_attach,
736 lp_detach,
737 NULL
738 };
739
740 int __init lp_init (void)
741 {
742 int i;
743
744 if (parport_nr[0] == LP_PARPORT_OFF)
745 return 0;
746
747 for (i = 0; i < LP_NO; i++) {
748 lp_table[i].dev = NULL;
749 lp_table[i].flags = 0;
750 lp_table[i].chars = LP_INIT_CHAR;
751 lp_table[i].time = LP_INIT_TIME;
752 lp_table[i].wait = LP_INIT_WAIT;
753 lp_table[i].lp_buffer = NULL;
754 #ifdef LP_STATS
755 lp_table[i].lastcall = 0;
756 lp_table[i].runchars = 0;
757 memset (&lp_table[i].stats, 0, sizeof (struct lp_stats));
758 #endif
759 lp_table[i].last_error = 0;
760 init_waitqueue_head (&lp_table[i].waitq);
761 init_waitqueue_head (&lp_table[i].dataq);
762 init_MUTEX (&lp_table[i].port_mutex);
763 lp_table[i].timeout = 10 * HZ;
764 }
765
766 if (devfs_register_chrdev (LP_MAJOR, "lp", &lp_fops)) {
767 printk ("lp: unable to get major %d\n", LP_MAJOR);
768 return -EIO;
769 }
770
771 devfs_handle = devfs_mk_dir (NULL, "printers", NULL);
772
773 if (parport_register_driver (&lp_driver)) {
774 printk ("lp: unable to register with parport\n");
775 return -EIO;
776 }
777
778 if (!lp_count) {
779 printk (KERN_INFO "lp: driver loaded but no devices found\n");
780 #ifndef CONFIG_PARPORT_1284
781 if (parport_nr[0] == LP_PARPORT_AUTO)
782 printk (KERN_INFO "lp: (is IEEE 1284 support enabled?)\n");
783 #endif
784 }
785
786 return 0;
787 }
788
789 #ifdef MODULE
790 int init_module(void)
791 {
792 if (parport[0]) {
793 /* The user gave some parameters. Let's see what they were. */
794 if (!strncmp(parport[0], "auto", 4))
795 parport_nr[0] = LP_PARPORT_AUTO;
796 else {
797 int n;
798 for (n = 0; n < LP_NO && parport[n]; n++) {
799 if (!strncmp(parport[n], "none", 4))
800 parport_nr[n] = LP_PARPORT_NONE;
801 else {
802 char *ep;
803 unsigned long r = simple_strtoul(parport[n], &ep, 0);
804 if (ep != parport[n])
805 parport_nr[n] = r;
806 else {
807 printk(KERN_ERR "lp: bad port specifier `%s'\n", parport[n]);
808 return -ENODEV;
809 }
810 }
811 }
812 }
813 }
814
815 return lp_init();
816 }
817
818 void cleanup_module(void)
819 {
820 unsigned int offset;
821
822 parport_unregister_driver (&lp_driver);
823
824 #ifdef CONFIG_LP_CONSOLE
825 unregister_console (&lpcons);
826 #endif
827
828 devfs_unregister (devfs_handle);
829 devfs_unregister_chrdev(LP_MAJOR, "lp");
830 for (offset = 0; offset < LP_NO; offset++) {
831 if (lp_table[offset].dev == NULL)
832 continue;
833 parport_unregister_device(lp_table[offset].dev);
834 }
835 }
836 #endif
837
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