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/signal.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 #include <linux/mutex.h>
130 #include <linux/compat.h>
131
132 #include <linux/parport.h>
133 #undef LP_STATS
134 #include <linux/lp.h>
135
136 #include <asm/irq.h>
137 #include <linux/uaccess.h>
138
139 /* if you have more than 8 printers, remember to increase LP_NO */
140 #define LP_NO 8
141
142 static DEFINE_MUTEX(lp_mutex);
143 static struct lp_struct lp_table[LP_NO];
144
145 static unsigned int lp_count = 0;
146 static struct class *lp_class;
147
148 #ifdef CONFIG_LP_CONSOLE
149 static struct parport *console_registered;
150 #endif /* CONFIG_LP_CONSOLE */
151
152 #undef LP_DEBUG
153
154 /* Bits used to manage claiming the parport device */
155 #define LP_PREEMPT_REQUEST 1
156 #define LP_PARPORT_CLAIMED 2
157
158 /* --- low-level port access ----------------------------------- */
159
160 #define r_dtr(x) (parport_read_data(lp_table[(x)].dev->port))
161 #define r_str(x) (parport_read_status(lp_table[(x)].dev->port))
162 #define w_ctr(x,y) do { parport_write_control(lp_table[(x)].dev->port, (y)); } while (0)
163 #define w_dtr(x,y) do { parport_write_data(lp_table[(x)].dev->port, (y)); } while (0)
164
165 /* Claim the parport or block trying unless we've already claimed it */
lp_claim_parport_or_block(struct lp_struct * this_lp)166 static void lp_claim_parport_or_block(struct lp_struct *this_lp)
167 {
168 if (!test_and_set_bit(LP_PARPORT_CLAIMED, &this_lp->bits)) {
169 parport_claim_or_block (this_lp->dev);
170 }
171 }
172
173 /* Claim the parport or block trying unless we've already claimed it */
lp_release_parport(struct lp_struct * this_lp)174 static void lp_release_parport(struct lp_struct *this_lp)
175 {
176 if (test_and_clear_bit(LP_PARPORT_CLAIMED, &this_lp->bits)) {
177 parport_release (this_lp->dev);
178 }
179 }
180
181
182
lp_preempt(void * handle)183 static int lp_preempt(void *handle)
184 {
185 struct lp_struct *this_lp = (struct lp_struct *)handle;
186 set_bit(LP_PREEMPT_REQUEST, &this_lp->bits);
187 return (1);
188 }
189
190
191 /*
192 * Try to negotiate to a new mode; if unsuccessful negotiate to
193 * compatibility mode. Return the mode we ended up in.
194 */
lp_negotiate(struct parport * port,int mode)195 static int lp_negotiate(struct parport * port, int mode)
196 {
197 if (parport_negotiate (port, mode) != 0) {
198 mode = IEEE1284_MODE_COMPAT;
199 parport_negotiate (port, mode);
200 }
201
202 return (mode);
203 }
204
lp_reset(int minor)205 static int lp_reset(int minor)
206 {
207 int retval;
208 lp_claim_parport_or_block (&lp_table[minor]);
209 w_ctr(minor, LP_PSELECP);
210 udelay (LP_DELAY);
211 w_ctr(minor, LP_PSELECP | LP_PINITP);
212 retval = r_str(minor);
213 lp_release_parport (&lp_table[minor]);
214 return retval;
215 }
216
lp_error(int minor)217 static void lp_error (int minor)
218 {
219 DEFINE_WAIT(wait);
220 int polling;
221
222 if (LP_F(minor) & LP_ABORT)
223 return;
224
225 polling = lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE;
226 if (polling) lp_release_parport (&lp_table[minor]);
227 prepare_to_wait(&lp_table[minor].waitq, &wait, TASK_INTERRUPTIBLE);
228 schedule_timeout(LP_TIMEOUT_POLLED);
229 finish_wait(&lp_table[minor].waitq, &wait);
230 if (polling) lp_claim_parport_or_block (&lp_table[minor]);
231 else parport_yield_blocking (lp_table[minor].dev);
232 }
233
lp_check_status(int minor)234 static int lp_check_status(int minor)
235 {
236 int error = 0;
237 unsigned int last = lp_table[minor].last_error;
238 unsigned char status = r_str(minor);
239 if ((status & LP_PERRORP) && !(LP_F(minor) & LP_CAREFUL))
240 /* No error. */
241 last = 0;
242 else if ((status & LP_POUTPA)) {
243 if (last != LP_POUTPA) {
244 last = LP_POUTPA;
245 printk(KERN_INFO "lp%d out of paper\n", minor);
246 }
247 error = -ENOSPC;
248 } else if (!(status & LP_PSELECD)) {
249 if (last != LP_PSELECD) {
250 last = LP_PSELECD;
251 printk(KERN_INFO "lp%d off-line\n", minor);
252 }
253 error = -EIO;
254 } else if (!(status & LP_PERRORP)) {
255 if (last != LP_PERRORP) {
256 last = LP_PERRORP;
257 printk(KERN_INFO "lp%d on fire\n", minor);
258 }
259 error = -EIO;
260 } else {
261 last = 0; /* Come here if LP_CAREFUL is set and no
262 errors are reported. */
263 }
264
265 lp_table[minor].last_error = last;
266
267 if (last != 0)
268 lp_error(minor);
269
270 return error;
271 }
272
lp_wait_ready(int minor,int nonblock)273 static int lp_wait_ready(int minor, int nonblock)
274 {
275 int error = 0;
276
277 /* If we're not in compatibility mode, we're ready now! */
278 if (lp_table[minor].current_mode != IEEE1284_MODE_COMPAT) {
279 return (0);
280 }
281
282 do {
283 error = lp_check_status (minor);
284 if (error && (nonblock || (LP_F(minor) & LP_ABORT)))
285 break;
286 if (signal_pending (current)) {
287 error = -EINTR;
288 break;
289 }
290 } while (error);
291 return error;
292 }
293
lp_write(struct file * file,const char __user * buf,size_t count,loff_t * ppos)294 static ssize_t lp_write(struct file * file, const char __user * buf,
295 size_t count, loff_t *ppos)
296 {
297 unsigned int minor = iminor(file_inode(file));
298 struct parport *port = lp_table[minor].dev->port;
299 char *kbuf = lp_table[minor].lp_buffer;
300 ssize_t retv = 0;
301 ssize_t written;
302 size_t copy_size = count;
303 int nonblock = ((file->f_flags & O_NONBLOCK) ||
304 (LP_F(minor) & LP_ABORT));
305
306 #ifdef LP_STATS
307 if (time_after(jiffies, lp_table[minor].lastcall + LP_TIME(minor)))
308 lp_table[minor].runchars = 0;
309
310 lp_table[minor].lastcall = jiffies;
311 #endif
312
313 /* Need to copy the data from user-space. */
314 if (copy_size > LP_BUFFER_SIZE)
315 copy_size = LP_BUFFER_SIZE;
316
317 if (mutex_lock_interruptible(&lp_table[minor].port_mutex))
318 return -EINTR;
319
320 if (copy_from_user (kbuf, buf, copy_size)) {
321 retv = -EFAULT;
322 goto out_unlock;
323 }
324
325 /* Claim Parport or sleep until it becomes available
326 */
327 lp_claim_parport_or_block (&lp_table[minor]);
328 /* Go to the proper mode. */
329 lp_table[minor].current_mode = lp_negotiate (port,
330 lp_table[minor].best_mode);
331
332 parport_set_timeout (lp_table[minor].dev,
333 (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK
334 : lp_table[minor].timeout));
335
336 if ((retv = lp_wait_ready (minor, nonblock)) == 0)
337 do {
338 /* Write the data. */
339 written = parport_write (port, kbuf, copy_size);
340 if (written > 0) {
341 copy_size -= written;
342 count -= written;
343 buf += written;
344 retv += written;
345 }
346
347 if (signal_pending (current)) {
348 if (retv == 0)
349 retv = -EINTR;
350
351 break;
352 }
353
354 if (copy_size > 0) {
355 /* incomplete write -> check error ! */
356 int error;
357
358 parport_negotiate (lp_table[minor].dev->port,
359 IEEE1284_MODE_COMPAT);
360 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
361
362 error = lp_wait_ready (minor, nonblock);
363
364 if (error) {
365 if (retv == 0)
366 retv = error;
367 break;
368 } else if (nonblock) {
369 if (retv == 0)
370 retv = -EAGAIN;
371 break;
372 }
373
374 parport_yield_blocking (lp_table[minor].dev);
375 lp_table[minor].current_mode
376 = lp_negotiate (port,
377 lp_table[minor].best_mode);
378
379 } else if (need_resched())
380 schedule ();
381
382 if (count) {
383 copy_size = count;
384 if (copy_size > LP_BUFFER_SIZE)
385 copy_size = LP_BUFFER_SIZE;
386
387 if (copy_from_user(kbuf, buf, copy_size)) {
388 if (retv == 0)
389 retv = -EFAULT;
390 break;
391 }
392 }
393 } while (count > 0);
394
395 if (test_and_clear_bit(LP_PREEMPT_REQUEST,
396 &lp_table[minor].bits)) {
397 printk(KERN_INFO "lp%d releasing parport\n", minor);
398 parport_negotiate (lp_table[minor].dev->port,
399 IEEE1284_MODE_COMPAT);
400 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
401 lp_release_parport (&lp_table[minor]);
402 }
403 out_unlock:
404 mutex_unlock(&lp_table[minor].port_mutex);
405
406 return retv;
407 }
408
409 #ifdef CONFIG_PARPORT_1284
410
411 /* Status readback conforming to ieee1284 */
lp_read(struct file * file,char __user * buf,size_t count,loff_t * ppos)412 static ssize_t lp_read(struct file * file, char __user * buf,
413 size_t count, loff_t *ppos)
414 {
415 DEFINE_WAIT(wait);
416 unsigned int minor=iminor(file_inode(file));
417 struct parport *port = lp_table[minor].dev->port;
418 ssize_t retval = 0;
419 char *kbuf = lp_table[minor].lp_buffer;
420 int nonblock = ((file->f_flags & O_NONBLOCK) ||
421 (LP_F(minor) & LP_ABORT));
422
423 if (count > LP_BUFFER_SIZE)
424 count = LP_BUFFER_SIZE;
425
426 if (mutex_lock_interruptible(&lp_table[minor].port_mutex))
427 return -EINTR;
428
429 lp_claim_parport_or_block (&lp_table[minor]);
430
431 parport_set_timeout (lp_table[minor].dev,
432 (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK
433 : lp_table[minor].timeout));
434
435 parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
436 if (parport_negotiate (lp_table[minor].dev->port,
437 IEEE1284_MODE_NIBBLE)) {
438 retval = -EIO;
439 goto out;
440 }
441
442 while (retval == 0) {
443 retval = parport_read (port, kbuf, count);
444
445 if (retval > 0)
446 break;
447
448 if (nonblock) {
449 retval = -EAGAIN;
450 break;
451 }
452
453 /* Wait for data. */
454
455 if (lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE) {
456 parport_negotiate (lp_table[minor].dev->port,
457 IEEE1284_MODE_COMPAT);
458 lp_error (minor);
459 if (parport_negotiate (lp_table[minor].dev->port,
460 IEEE1284_MODE_NIBBLE)) {
461 retval = -EIO;
462 goto out;
463 }
464 } else {
465 prepare_to_wait(&lp_table[minor].waitq, &wait, TASK_INTERRUPTIBLE);
466 schedule_timeout(LP_TIMEOUT_POLLED);
467 finish_wait(&lp_table[minor].waitq, &wait);
468 }
469
470 if (signal_pending (current)) {
471 retval = -ERESTARTSYS;
472 break;
473 }
474
475 cond_resched ();
476 }
477 parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
478 out:
479 lp_release_parport (&lp_table[minor]);
480
481 if (retval > 0 && copy_to_user (buf, kbuf, retval))
482 retval = -EFAULT;
483
484 mutex_unlock(&lp_table[minor].port_mutex);
485
486 return retval;
487 }
488
489 #endif /* IEEE 1284 support */
490
lp_open(struct inode * inode,struct file * file)491 static int lp_open(struct inode * inode, struct file * file)
492 {
493 unsigned int minor = iminor(inode);
494 int ret = 0;
495
496 mutex_lock(&lp_mutex);
497 if (minor >= LP_NO) {
498 ret = -ENXIO;
499 goto out;
500 }
501 if ((LP_F(minor) & LP_EXIST) == 0) {
502 ret = -ENXIO;
503 goto out;
504 }
505 if (test_and_set_bit(LP_BUSY_BIT_POS, &LP_F(minor))) {
506 ret = -EBUSY;
507 goto out;
508 }
509 /* If ABORTOPEN is set and the printer is offline or out of paper,
510 we may still want to open it to perform ioctl()s. Therefore we
511 have commandeered O_NONBLOCK, even though it is being used in
512 a non-standard manner. This is strictly a Linux hack, and
513 should most likely only ever be used by the tunelp application. */
514 if ((LP_F(minor) & LP_ABORTOPEN) && !(file->f_flags & O_NONBLOCK)) {
515 int status;
516 lp_claim_parport_or_block (&lp_table[minor]);
517 status = r_str(minor);
518 lp_release_parport (&lp_table[minor]);
519 if (status & LP_POUTPA) {
520 printk(KERN_INFO "lp%d out of paper\n", minor);
521 LP_F(minor) &= ~LP_BUSY;
522 ret = -ENOSPC;
523 goto out;
524 } else if (!(status & LP_PSELECD)) {
525 printk(KERN_INFO "lp%d off-line\n", minor);
526 LP_F(minor) &= ~LP_BUSY;
527 ret = -EIO;
528 goto out;
529 } else if (!(status & LP_PERRORP)) {
530 printk(KERN_ERR "lp%d printer error\n", minor);
531 LP_F(minor) &= ~LP_BUSY;
532 ret = -EIO;
533 goto out;
534 }
535 }
536 lp_table[minor].lp_buffer = kmalloc(LP_BUFFER_SIZE, GFP_KERNEL);
537 if (!lp_table[minor].lp_buffer) {
538 LP_F(minor) &= ~LP_BUSY;
539 ret = -ENOMEM;
540 goto out;
541 }
542 /* Determine if the peripheral supports ECP mode */
543 lp_claim_parport_or_block (&lp_table[minor]);
544 if ( (lp_table[minor].dev->port->modes & PARPORT_MODE_ECP) &&
545 !parport_negotiate (lp_table[minor].dev->port,
546 IEEE1284_MODE_ECP)) {
547 printk (KERN_INFO "lp%d: ECP mode\n", minor);
548 lp_table[minor].best_mode = IEEE1284_MODE_ECP;
549 } else {
550 lp_table[minor].best_mode = IEEE1284_MODE_COMPAT;
551 }
552 /* Leave peripheral in compatibility mode */
553 parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
554 lp_release_parport (&lp_table[minor]);
555 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
556 out:
557 mutex_unlock(&lp_mutex);
558 return ret;
559 }
560
lp_release(struct inode * inode,struct file * file)561 static int lp_release(struct inode * inode, struct file * file)
562 {
563 unsigned int minor = iminor(inode);
564
565 lp_claim_parport_or_block (&lp_table[minor]);
566 parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
567 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
568 lp_release_parport (&lp_table[minor]);
569 kfree(lp_table[minor].lp_buffer);
570 lp_table[minor].lp_buffer = NULL;
571 LP_F(minor) &= ~LP_BUSY;
572 return 0;
573 }
574
lp_do_ioctl(unsigned int minor,unsigned int cmd,unsigned long arg,void __user * argp)575 static int lp_do_ioctl(unsigned int minor, unsigned int cmd,
576 unsigned long arg, void __user *argp)
577 {
578 int status;
579 int retval = 0;
580
581 #ifdef LP_DEBUG
582 printk(KERN_DEBUG "lp%d ioctl, cmd: 0x%x, arg: 0x%lx\n", minor, cmd, arg);
583 #endif
584 if (minor >= LP_NO)
585 return -ENODEV;
586 if ((LP_F(minor) & LP_EXIST) == 0)
587 return -ENODEV;
588 switch ( cmd ) {
589 case LPTIME:
590 if (arg > UINT_MAX / HZ)
591 return -EINVAL;
592 LP_TIME(minor) = arg * HZ/100;
593 break;
594 case LPCHAR:
595 LP_CHAR(minor) = arg;
596 break;
597 case LPABORT:
598 if (arg)
599 LP_F(minor) |= LP_ABORT;
600 else
601 LP_F(minor) &= ~LP_ABORT;
602 break;
603 case LPABORTOPEN:
604 if (arg)
605 LP_F(minor) |= LP_ABORTOPEN;
606 else
607 LP_F(minor) &= ~LP_ABORTOPEN;
608 break;
609 case LPCAREFUL:
610 if (arg)
611 LP_F(minor) |= LP_CAREFUL;
612 else
613 LP_F(minor) &= ~LP_CAREFUL;
614 break;
615 case LPWAIT:
616 LP_WAIT(minor) = arg;
617 break;
618 case LPSETIRQ:
619 return -EINVAL;
620 break;
621 case LPGETIRQ:
622 if (copy_to_user(argp, &LP_IRQ(minor),
623 sizeof(int)))
624 return -EFAULT;
625 break;
626 case LPGETSTATUS:
627 if (mutex_lock_interruptible(&lp_table[minor].port_mutex))
628 return -EINTR;
629 lp_claim_parport_or_block (&lp_table[minor]);
630 status = r_str(minor);
631 lp_release_parport (&lp_table[minor]);
632 mutex_unlock(&lp_table[minor].port_mutex);
633
634 if (copy_to_user(argp, &status, sizeof(int)))
635 return -EFAULT;
636 break;
637 case LPRESET:
638 lp_reset(minor);
639 break;
640 #ifdef LP_STATS
641 case LPGETSTATS:
642 if (copy_to_user(argp, &LP_STAT(minor),
643 sizeof(struct lp_stats)))
644 return -EFAULT;
645 if (capable(CAP_SYS_ADMIN))
646 memset(&LP_STAT(minor), 0,
647 sizeof(struct lp_stats));
648 break;
649 #endif
650 case LPGETFLAGS:
651 status = LP_F(minor);
652 if (copy_to_user(argp, &status, sizeof(int)))
653 return -EFAULT;
654 break;
655
656 default:
657 retval = -EINVAL;
658 }
659 return retval;
660 }
661
lp_set_timeout(unsigned int minor,s64 tv_sec,long tv_usec)662 static int lp_set_timeout(unsigned int minor, s64 tv_sec, long tv_usec)
663 {
664 long to_jiffies;
665
666 /* Convert to jiffies, place in lp_table */
667 if (tv_sec < 0 || tv_usec < 0)
668 return -EINVAL;
669
670 /*
671 * we used to not check, so let's not make this fatal,
672 * but deal with user space passing a 32-bit tv_nsec in
673 * a 64-bit field, capping the timeout to 1 second
674 * worth of microseconds, and capping the total at
675 * MAX_JIFFY_OFFSET.
676 */
677 if (tv_usec > 999999)
678 tv_usec = 999999;
679
680 if (tv_sec >= MAX_SEC_IN_JIFFIES - 1) {
681 to_jiffies = MAX_JIFFY_OFFSET;
682 } else {
683 to_jiffies = DIV_ROUND_UP(tv_usec, 1000000/HZ);
684 to_jiffies += tv_sec * (long) HZ;
685 }
686
687 if (to_jiffies <= 0) {
688 return -EINVAL;
689 }
690 lp_table[minor].timeout = to_jiffies;
691 return 0;
692 }
693
lp_set_timeout32(unsigned int minor,void __user * arg)694 static int lp_set_timeout32(unsigned int minor, void __user *arg)
695 {
696 s32 karg[2];
697
698 if (copy_from_user(karg, arg, sizeof(karg)))
699 return -EFAULT;
700
701 return lp_set_timeout(minor, karg[0], karg[1]);
702 }
703
lp_set_timeout64(unsigned int minor,void __user * arg)704 static int lp_set_timeout64(unsigned int minor, void __user *arg)
705 {
706 s64 karg[2];
707
708 if (copy_from_user(karg, arg, sizeof(karg)))
709 return -EFAULT;
710
711 return lp_set_timeout(minor, karg[0], karg[1]);
712 }
713
lp_ioctl(struct file * file,unsigned int cmd,unsigned long arg)714 static long lp_ioctl(struct file *file, unsigned int cmd,
715 unsigned long arg)
716 {
717 unsigned int minor;
718 int ret;
719
720 minor = iminor(file_inode(file));
721 mutex_lock(&lp_mutex);
722 switch (cmd) {
723 case LPSETTIMEOUT_OLD:
724 if (BITS_PER_LONG == 32) {
725 ret = lp_set_timeout32(minor, (void __user *)arg);
726 break;
727 }
728 /* fallthrough for 64-bit */
729 case LPSETTIMEOUT_NEW:
730 ret = lp_set_timeout64(minor, (void __user *)arg);
731 break;
732 default:
733 ret = lp_do_ioctl(minor, cmd, arg, (void __user *)arg);
734 break;
735 }
736 mutex_unlock(&lp_mutex);
737
738 return ret;
739 }
740
741 #ifdef CONFIG_COMPAT
lp_compat_ioctl(struct file * file,unsigned int cmd,unsigned long arg)742 static long lp_compat_ioctl(struct file *file, unsigned int cmd,
743 unsigned long arg)
744 {
745 unsigned int minor;
746 int ret;
747
748 minor = iminor(file_inode(file));
749 mutex_lock(&lp_mutex);
750 switch (cmd) {
751 case LPSETTIMEOUT_OLD:
752 if (!COMPAT_USE_64BIT_TIME) {
753 ret = lp_set_timeout32(minor, (void __user *)arg);
754 break;
755 }
756 /* fallthrough for x32 mode */
757 case LPSETTIMEOUT_NEW:
758 ret = lp_set_timeout64(minor, (void __user *)arg);
759 break;
760 #ifdef LP_STATS
761 case LPGETSTATS:
762 /* FIXME: add an implementation if you set LP_STATS */
763 ret = -EINVAL;
764 break;
765 #endif
766 default:
767 ret = lp_do_ioctl(minor, cmd, arg, compat_ptr(arg));
768 break;
769 }
770 mutex_unlock(&lp_mutex);
771
772 return ret;
773 }
774 #endif
775
776 static const struct file_operations lp_fops = {
777 .owner = THIS_MODULE,
778 .write = lp_write,
779 .unlocked_ioctl = lp_ioctl,
780 #ifdef CONFIG_COMPAT
781 .compat_ioctl = lp_compat_ioctl,
782 #endif
783 .open = lp_open,
784 .release = lp_release,
785 #ifdef CONFIG_PARPORT_1284
786 .read = lp_read,
787 #endif
788 .llseek = noop_llseek,
789 };
790
791 /* --- support for console on the line printer ----------------- */
792
793 #ifdef CONFIG_LP_CONSOLE
794
795 #define CONSOLE_LP 0
796
797 /* If the printer is out of paper, we can either lose the messages or
798 * stall until the printer is happy again. Define CONSOLE_LP_STRICT
799 * non-zero to get the latter behaviour. */
800 #define CONSOLE_LP_STRICT 1
801
802 /* The console must be locked when we get here. */
803
lp_console_write(struct console * co,const char * s,unsigned count)804 static void lp_console_write (struct console *co, const char *s,
805 unsigned count)
806 {
807 struct pardevice *dev = lp_table[CONSOLE_LP].dev;
808 struct parport *port = dev->port;
809 ssize_t written;
810
811 if (parport_claim (dev))
812 /* Nothing we can do. */
813 return;
814
815 parport_set_timeout (dev, 0);
816
817 /* Go to compatibility mode. */
818 parport_negotiate (port, IEEE1284_MODE_COMPAT);
819
820 do {
821 /* Write the data, converting LF->CRLF as we go. */
822 ssize_t canwrite = count;
823 char *lf = memchr (s, '\n', count);
824 if (lf)
825 canwrite = lf - s;
826
827 if (canwrite > 0) {
828 written = parport_write (port, s, canwrite);
829
830 if (written <= 0)
831 continue;
832
833 s += written;
834 count -= written;
835 canwrite -= written;
836 }
837
838 if (lf && canwrite <= 0) {
839 const char *crlf = "\r\n";
840 int i = 2;
841
842 /* Dodge the original '\n', and put '\r\n' instead. */
843 s++;
844 count--;
845 do {
846 written = parport_write (port, crlf, i);
847 if (written > 0)
848 i -= written, crlf += written;
849 } while (i > 0 && (CONSOLE_LP_STRICT || written > 0));
850 }
851 } while (count > 0 && (CONSOLE_LP_STRICT || written > 0));
852
853 parport_release (dev);
854 }
855
856 static struct console lpcons = {
857 .name = "lp",
858 .write = lp_console_write,
859 .flags = CON_PRINTBUFFER,
860 };
861
862 #endif /* console on line printer */
863
864 /* --- initialisation code ------------------------------------- */
865
866 static int parport_nr[LP_NO] = { [0 ... LP_NO-1] = LP_PARPORT_UNSPEC };
867 static char *parport[LP_NO];
868 static bool reset;
869
870 module_param_array(parport, charp, NULL, 0);
871 module_param(reset, bool, 0);
872
873 #ifndef MODULE
lp_setup(char * str)874 static int __init lp_setup (char *str)
875 {
876 static int parport_ptr;
877 int x;
878
879 if (get_option(&str, &x)) {
880 if (x == 0) {
881 /* disable driver on "lp=" or "lp=0" */
882 parport_nr[0] = LP_PARPORT_OFF;
883 } else {
884 printk(KERN_WARNING "warning: 'lp=0x%x' is deprecated, ignored\n", x);
885 return 0;
886 }
887 } else if (!strncmp(str, "parport", 7)) {
888 int n = simple_strtoul(str+7, NULL, 10);
889 if (parport_ptr < LP_NO)
890 parport_nr[parport_ptr++] = n;
891 else
892 printk(KERN_INFO "lp: too many ports, %s ignored.\n",
893 str);
894 } else if (!strcmp(str, "auto")) {
895 parport_nr[0] = LP_PARPORT_AUTO;
896 } else if (!strcmp(str, "none")) {
897 if (parport_ptr < LP_NO)
898 parport_nr[parport_ptr++] = LP_PARPORT_NONE;
899 else
900 printk(KERN_INFO "lp: too many ports, %s ignored.\n",
901 str);
902 } else if (!strcmp(str, "reset")) {
903 reset = true;
904 }
905 return 1;
906 }
907 #endif
908
lp_register(int nr,struct parport * port)909 static int lp_register(int nr, struct parport *port)
910 {
911 lp_table[nr].dev = parport_register_device(port, "lp",
912 lp_preempt, NULL, NULL, 0,
913 (void *) &lp_table[nr]);
914 if (lp_table[nr].dev == NULL)
915 return 1;
916 lp_table[nr].flags |= LP_EXIST;
917
918 if (reset)
919 lp_reset(nr);
920
921 device_create(lp_class, port->dev, MKDEV(LP_MAJOR, nr), NULL,
922 "lp%d", nr);
923
924 printk(KERN_INFO "lp%d: using %s (%s).\n", nr, port->name,
925 (port->irq == PARPORT_IRQ_NONE)?"polling":"interrupt-driven");
926
927 #ifdef CONFIG_LP_CONSOLE
928 if (!nr) {
929 if (port->modes & PARPORT_MODE_SAFEININT) {
930 register_console(&lpcons);
931 console_registered = port;
932 printk (KERN_INFO "lp%d: console ready\n", CONSOLE_LP);
933 } else
934 printk (KERN_ERR "lp%d: cannot run console on %s\n",
935 CONSOLE_LP, port->name);
936 }
937 #endif
938
939 return 0;
940 }
941
lp_attach(struct parport * port)942 static void lp_attach (struct parport *port)
943 {
944 unsigned int i;
945
946 switch (parport_nr[0]) {
947 case LP_PARPORT_UNSPEC:
948 case LP_PARPORT_AUTO:
949 if (parport_nr[0] == LP_PARPORT_AUTO &&
950 port->probe_info[0].class != PARPORT_CLASS_PRINTER)
951 return;
952 if (lp_count == LP_NO) {
953 printk(KERN_INFO "lp: ignoring parallel port (max. %d)\n",LP_NO);
954 return;
955 }
956 if (!lp_register(lp_count, port))
957 lp_count++;
958 break;
959
960 default:
961 for (i = 0; i < LP_NO; i++) {
962 if (port->number == parport_nr[i]) {
963 if (!lp_register(i, port))
964 lp_count++;
965 break;
966 }
967 }
968 break;
969 }
970 }
971
lp_detach(struct parport * port)972 static void lp_detach (struct parport *port)
973 {
974 /* Write this some day. */
975 #ifdef CONFIG_LP_CONSOLE
976 if (console_registered == port) {
977 unregister_console(&lpcons);
978 console_registered = NULL;
979 }
980 #endif /* CONFIG_LP_CONSOLE */
981 }
982
983 static struct parport_driver lp_driver = {
984 .name = "lp",
985 .attach = lp_attach,
986 .detach = lp_detach,
987 };
988
lp_init(void)989 static int __init lp_init (void)
990 {
991 int i, err = 0;
992
993 if (parport_nr[0] == LP_PARPORT_OFF)
994 return 0;
995
996 for (i = 0; i < LP_NO; i++) {
997 lp_table[i].dev = NULL;
998 lp_table[i].flags = 0;
999 lp_table[i].chars = LP_INIT_CHAR;
1000 lp_table[i].time = LP_INIT_TIME;
1001 lp_table[i].wait = LP_INIT_WAIT;
1002 lp_table[i].lp_buffer = NULL;
1003 #ifdef LP_STATS
1004 lp_table[i].lastcall = 0;
1005 lp_table[i].runchars = 0;
1006 memset (&lp_table[i].stats, 0, sizeof (struct lp_stats));
1007 #endif
1008 lp_table[i].last_error = 0;
1009 init_waitqueue_head (&lp_table[i].waitq);
1010 init_waitqueue_head (&lp_table[i].dataq);
1011 mutex_init(&lp_table[i].port_mutex);
1012 lp_table[i].timeout = 10 * HZ;
1013 }
1014
1015 if (register_chrdev (LP_MAJOR, "lp", &lp_fops)) {
1016 printk (KERN_ERR "lp: unable to get major %d\n", LP_MAJOR);
1017 return -EIO;
1018 }
1019
1020 lp_class = class_create(THIS_MODULE, "printer");
1021 if (IS_ERR(lp_class)) {
1022 err = PTR_ERR(lp_class);
1023 goto out_reg;
1024 }
1025
1026 if (parport_register_driver (&lp_driver)) {
1027 printk (KERN_ERR "lp: unable to register with parport\n");
1028 err = -EIO;
1029 goto out_class;
1030 }
1031
1032 if (!lp_count) {
1033 printk (KERN_INFO "lp: driver loaded but no devices found\n");
1034 #ifndef CONFIG_PARPORT_1284
1035 if (parport_nr[0] == LP_PARPORT_AUTO)
1036 printk (KERN_INFO "lp: (is IEEE 1284 support enabled?)\n");
1037 #endif
1038 }
1039
1040 return 0;
1041
1042 out_class:
1043 class_destroy(lp_class);
1044 out_reg:
1045 unregister_chrdev(LP_MAJOR, "lp");
1046 return err;
1047 }
1048
lp_init_module(void)1049 static int __init lp_init_module (void)
1050 {
1051 if (parport[0]) {
1052 /* The user gave some parameters. Let's see what they were. */
1053 if (!strncmp(parport[0], "auto", 4))
1054 parport_nr[0] = LP_PARPORT_AUTO;
1055 else {
1056 int n;
1057 for (n = 0; n < LP_NO && parport[n]; n++) {
1058 if (!strncmp(parport[n], "none", 4))
1059 parport_nr[n] = LP_PARPORT_NONE;
1060 else {
1061 char *ep;
1062 unsigned long r = simple_strtoul(parport[n], &ep, 0);
1063 if (ep != parport[n])
1064 parport_nr[n] = r;
1065 else {
1066 printk(KERN_ERR "lp: bad port specifier `%s'\n", parport[n]);
1067 return -ENODEV;
1068 }
1069 }
1070 }
1071 }
1072 }
1073
1074 return lp_init();
1075 }
1076
lp_cleanup_module(void)1077 static void lp_cleanup_module (void)
1078 {
1079 unsigned int offset;
1080
1081 parport_unregister_driver (&lp_driver);
1082
1083 #ifdef CONFIG_LP_CONSOLE
1084 unregister_console (&lpcons);
1085 #endif
1086
1087 unregister_chrdev(LP_MAJOR, "lp");
1088 for (offset = 0; offset < LP_NO; offset++) {
1089 if (lp_table[offset].dev == NULL)
1090 continue;
1091 parport_unregister_device(lp_table[offset].dev);
1092 device_destroy(lp_class, MKDEV(LP_MAJOR, offset));
1093 }
1094 class_destroy(lp_class);
1095 }
1096
1097 __setup("lp=", lp_setup);
1098 module_init(lp_init_module);
1099 module_exit(lp_cleanup_module);
1100
1101 MODULE_ALIAS_CHARDEV_MAJOR(LP_MAJOR);
1102 MODULE_LICENSE("GPL");
1103
