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/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 : #include <linux/device.h>
130 : #include <linux/wait.h>
131 : #include <linux/jiffies.h>
132 :
133 : #include <linux/parport.h>
134 : #undef LP_STATS
135 : #include <linux/lp.h>
136 :
137 : #include <asm/irq.h>
138 : #include <asm/uaccess.h>
139 : #include <asm/system.h>
140 :
141 : /* if you have more than 8 printers, remember to increase LP_NO */
142 : #define LP_NO 8
143 :
144 : /* ROUND_UP macro from fs/select.c */
145 : #define ROUND_UP(x,y) (((x)+(y)-1)/(y))
146 :
147 : static struct lp_struct lp_table[LP_NO];
148 :
149 : static unsigned int lp_count = 0;
150 : static struct class *lp_class;
151 :
152 : #ifdef CONFIG_LP_CONSOLE
153 : static struct parport *console_registered; // initially NULL
154 : #endif /* CONFIG_LP_CONSOLE */
155 :
156 : #undef LP_DEBUG
157 :
158 : /* Bits used to manage claiming the parport device */
159 : #define LP_PREEMPT_REQUEST 1
160 : #define LP_PARPORT_CLAIMED 2
161 :
162 : /* --- low-level port access ----------------------------------- */
163 :
164 : #define r_dtr(x) (parport_read_data(lp_table[(x)].dev->port))
165 : #define r_str(x) (parport_read_status(lp_table[(x)].dev->port))
166 : #define w_ctr(x,y) do { parport_write_control(lp_table[(x)].dev->port, (y)); } while (0)
167 : #define w_dtr(x,y) do { parport_write_data(lp_table[(x)].dev->port, (y)); } while (0)
168 :
169 : /* Claim the parport or block trying unless we've already claimed it */
170 : static void lp_claim_parport_or_block(struct lp_struct *this_lp)
171 2 : {
172 2 : if (!test_and_set_bit(LP_PARPORT_CLAIMED, &this_lp->bits)) {
173 2 : parport_claim_or_block (this_lp->dev);
174 : }
175 : }
176 :
177 : /* Claim the parport or block trying unless we've already claimed it */
178 : static void lp_release_parport(struct lp_struct *this_lp)
179 2 : {
180 2 : if (test_and_clear_bit(LP_PARPORT_CLAIMED, &this_lp->bits)) {
181 2 : parport_release (this_lp->dev);
182 : }
183 : }
184 :
185 :
186 :
187 : static int lp_preempt(void *handle)
188 0 : {
189 0 : struct lp_struct *this_lp = (struct lp_struct *)handle;
190 0 : set_bit(LP_PREEMPT_REQUEST, &this_lp->bits);
191 0 : return (1);
192 : }
193 :
194 :
195 : /*
196 : * Try to negotiate to a new mode; if unsuccessful negotiate to
197 : * compatibility mode. Return the mode we ended up in.
198 : */
199 : static int lp_negotiate(struct parport * port, int mode)
200 0 : {
201 0 : if (parport_negotiate (port, mode) != 0) {
202 0 : mode = IEEE1284_MODE_COMPAT;
203 0 : parport_negotiate (port, mode);
204 : }
205 :
206 0 : return (mode);
207 : }
208 :
209 : static int lp_reset(int minor)
210 0 : {
211 0 : int retval;
212 0 : lp_claim_parport_or_block (&lp_table[minor]);
213 0 : w_ctr(minor, LP_PSELECP);
214 0 : udelay (LP_DELAY);
215 0 : w_ctr(minor, LP_PSELECP | LP_PINITP);
216 0 : retval = r_str(minor);
217 0 : lp_release_parport (&lp_table[minor]);
218 0 : return retval;
219 : }
220 :
221 : static void lp_error (int minor)
222 0 : {
223 0 : DEFINE_WAIT(wait);
224 0 : int polling;
225 :
226 0 : if (LP_F(minor) & LP_ABORT)
227 0 : return;
228 :
229 0 : polling = lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE;
230 0 : if (polling) lp_release_parport (&lp_table[minor]);
231 0 : prepare_to_wait(&lp_table[minor].waitq, &wait, TASK_INTERRUPTIBLE);
232 0 : schedule_timeout(LP_TIMEOUT_POLLED);
233 0 : finish_wait(&lp_table[minor].waitq, &wait);
234 0 : if (polling) lp_claim_parport_or_block (&lp_table[minor]);
235 0 : else parport_yield_blocking (lp_table[minor].dev);
236 : }
237 :
238 : static int lp_check_status(int minor)
239 0 : {
240 0 : int error = 0;
241 0 : unsigned int last = lp_table[minor].last_error;
242 0 : unsigned char status = r_str(minor);
243 0 : if ((status & LP_PERRORP) && !(LP_F(minor) & LP_CAREFUL))
244 : /* No error. */
245 0 : last = 0;
246 0 : else if ((status & LP_POUTPA)) {
247 0 : if (last != LP_POUTPA) {
248 0 : last = LP_POUTPA;
249 0 : printk(KERN_INFO "lp%d out of paper\n", minor);
250 : }
251 0 : error = -ENOSPC;
252 0 : } else if (!(status & LP_PSELECD)) {
253 0 : if (last != LP_PSELECD) {
254 0 : last = LP_PSELECD;
255 0 : printk(KERN_INFO "lp%d off-line\n", minor);
256 : }
257 0 : error = -EIO;
258 0 : } else if (!(status & LP_PERRORP)) {
259 0 : if (last != LP_PERRORP) {
260 0 : last = LP_PERRORP;
261 0 : printk(KERN_INFO "lp%d on fire\n", minor);
262 : }
263 0 : error = -EIO;
264 : } else {
265 0 : last = 0; /* Come here if LP_CAREFUL is set and no
266 : errors are reported. */
267 : }
268 :
269 0 : lp_table[minor].last_error = last;
270 :
271 0 : if (last != 0)
272 0 : lp_error(minor);
273 :
274 0 : return error;
275 : }
276 :
277 : static int lp_wait_ready(int minor, int nonblock)
278 0 : {
279 0 : int error = 0;
280 :
281 : /* If we're not in compatibility mode, we're ready now! */
282 0 : if (lp_table[minor].current_mode != IEEE1284_MODE_COMPAT) {
283 0 : return (0);
284 : }
285 :
286 0 : do {
287 0 : error = lp_check_status (minor);
288 0 : if (error && (nonblock || (LP_F(minor) & LP_ABORT)))
289 0 : break;
290 0 : if (signal_pending (current)) {
291 0 : error = -EINTR;
292 0 : break;
293 : }
294 0 : } while (error);
295 0 : return error;
296 : }
297 :
298 : static ssize_t lp_write(struct file * file, const char __user * buf,
299 : size_t count, loff_t *ppos)
300 0 : {
301 0 : unsigned int minor = iminor(file->f_dentry->d_inode);
302 0 : struct parport *port = lp_table[minor].dev->port;
303 0 : char *kbuf = lp_table[minor].lp_buffer;
304 0 : ssize_t retv = 0;
305 0 : ssize_t written;
306 0 : size_t copy_size = count;
307 0 : int nonblock = ((file->f_flags & O_NONBLOCK) ||
308 0 : (LP_F(minor) & LP_ABORT));
309 :
310 : #ifdef LP_STATS
311 : if (time_after(jiffies, lp_table[minor].lastcall + LP_TIME(minor)))
312 : lp_table[minor].runchars = 0;
313 :
314 : lp_table[minor].lastcall = jiffies;
315 : #endif
316 :
317 : /* Need to copy the data from user-space. */
318 0 : if (copy_size > LP_BUFFER_SIZE)
319 0 : copy_size = LP_BUFFER_SIZE;
320 :
321 0 : if (down_interruptible (&lp_table[minor].port_mutex))
322 0 : return -EINTR;
323 :
324 0 : if (copy_from_user (kbuf, buf, copy_size)) {
325 0 : retv = -EFAULT;
326 0 : goto out_unlock;
327 : }
328 :
329 : /* Claim Parport or sleep until it becomes available
330 : */
331 0 : lp_claim_parport_or_block (&lp_table[minor]);
332 : /* Go to the proper mode. */
333 0 : lp_table[minor].current_mode = lp_negotiate (port,
334 : lp_table[minor].best_mode);
335 :
336 0 : parport_set_timeout (lp_table[minor].dev,
337 : (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK
338 : : lp_table[minor].timeout));
339 :
340 0 : if ((retv = lp_wait_ready (minor, nonblock)) == 0)
341 0 : do {
342 : /* Write the data. */
343 0 : written = parport_write (port, kbuf, copy_size);
344 0 : if (written > 0) {
345 0 : copy_size -= written;
346 0 : count -= written;
347 0 : buf += written;
348 0 : retv += written;
349 : }
350 :
351 0 : if (signal_pending (current)) {
352 0 : if (retv == 0)
353 0 : retv = -EINTR;
354 :
355 0 : break;
356 : }
357 :
358 0 : if (copy_size > 0) {
359 : /* incomplete write -> check error ! */
360 0 : int error;
361 :
362 0 : parport_negotiate (lp_table[minor].dev->port,
363 : IEEE1284_MODE_COMPAT);
364 0 : lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
365 :
366 0 : error = lp_wait_ready (minor, nonblock);
367 :
368 0 : if (error) {
369 0 : if (retv == 0)
370 0 : retv = error;
371 0 : break;
372 0 : } else if (nonblock) {
373 0 : if (retv == 0)
374 0 : retv = -EAGAIN;
375 0 : break;
376 : }
377 :
378 0 : parport_yield_blocking (lp_table[minor].dev);
379 0 : lp_table[minor].current_mode
380 : = lp_negotiate (port,
381 : lp_table[minor].best_mode);
382 :
383 0 : } else if (need_resched())
384 0 : schedule ();
385 :
386 0 : if (count) {
387 0 : copy_size = count;
388 0 : if (copy_size > LP_BUFFER_SIZE)
389 0 : copy_size = LP_BUFFER_SIZE;
390 :
391 0 : if (copy_from_user(kbuf, buf, copy_size)) {
392 0 : if (retv == 0)
393 0 : retv = -EFAULT;
394 0 : break;
395 : }
396 : }
397 0 : } while (count > 0);
398 :
399 0 : if (test_and_clear_bit(LP_PREEMPT_REQUEST,
400 : &lp_table[minor].bits)) {
401 0 : printk(KERN_INFO "lp%d releasing parport\n", minor);
402 0 : parport_negotiate (lp_table[minor].dev->port,
403 : IEEE1284_MODE_COMPAT);
404 0 : lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
405 0 : lp_release_parport (&lp_table[minor]);
406 : }
407 : out_unlock:
408 0 : up (&lp_table[minor].port_mutex);
409 :
410 0 : return retv;
411 : }
412 :
413 : #ifdef CONFIG_PARPORT_1284
414 :
415 : /* Status readback conforming to ieee1284 */
416 : static ssize_t lp_read(struct file * file, char __user * buf,
417 : size_t count, loff_t *ppos)
418 : {
419 : DEFINE_WAIT(wait);
420 : unsigned int minor=iminor(file->f_dentry->d_inode);
421 : struct parport *port = lp_table[minor].dev->port;
422 : ssize_t retval = 0;
423 : char *kbuf = lp_table[minor].lp_buffer;
424 : int nonblock = ((file->f_flags & O_NONBLOCK) ||
425 : (LP_F(minor) & LP_ABORT));
426 :
427 : if (count > LP_BUFFER_SIZE)
428 : count = LP_BUFFER_SIZE;
429 :
430 : if (down_interruptible (&lp_table[minor].port_mutex))
431 : return -EINTR;
432 :
433 : lp_claim_parport_or_block (&lp_table[minor]);
434 :
435 : parport_set_timeout (lp_table[minor].dev,
436 : (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK
437 : : lp_table[minor].timeout));
438 :
439 : parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
440 : if (parport_negotiate (lp_table[minor].dev->port,
441 : IEEE1284_MODE_NIBBLE)) {
442 : retval = -EIO;
443 : goto out;
444 : }
445 :
446 : while (retval == 0) {
447 : retval = parport_read (port, kbuf, count);
448 :
449 : if (retval > 0)
450 : break;
451 :
452 : if (nonblock) {
453 : retval = -EAGAIN;
454 : break;
455 : }
456 :
457 : /* Wait for data. */
458 :
459 : if (lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE) {
460 : parport_negotiate (lp_table[minor].dev->port,
461 : IEEE1284_MODE_COMPAT);
462 : lp_error (minor);
463 : if (parport_negotiate (lp_table[minor].dev->port,
464 : IEEE1284_MODE_NIBBLE)) {
465 : retval = -EIO;
466 : goto out;
467 : }
468 : } else {
469 : prepare_to_wait(&lp_table[minor].waitq, &wait, TASK_INTERRUPTIBLE);
470 : schedule_timeout(LP_TIMEOUT_POLLED);
471 : finish_wait(&lp_table[minor].waitq, &wait);
472 : }
473 :
474 : if (signal_pending (current)) {
475 : retval = -ERESTARTSYS;
476 : break;
477 : }
478 :
479 : cond_resched ();
480 : }
481 : parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
482 : out:
483 : lp_release_parport (&lp_table[minor]);
484 :
485 : if (retval > 0 && copy_to_user (buf, kbuf, retval))
486 : retval = -EFAULT;
487 :
488 : up (&lp_table[minor].port_mutex);
489 :
490 : return retval;
491 : }
492 :
493 : #endif /* IEEE 1284 support */
494 :
495 : static int lp_open(struct inode * inode, struct file * file)
496 5 : {
497 5 : unsigned int minor = iminor(inode);
498 :
499 5 : if (minor >= LP_NO)
500 0 : return -ENXIO;
501 5 : if ((LP_F(minor) & LP_EXIST) == 0)
502 4 : return -ENXIO;
503 1 : if (test_and_set_bit(LP_BUSY_BIT_POS, &LP_F(minor)))
504 0 : return -EBUSY;
505 :
506 : /* If ABORTOPEN is set and the printer is offline or out of paper,
507 : we may still want to open it to perform ioctl()s. Therefore we
508 : have commandeered O_NONBLOCK, even though it is being used in
509 : a non-standard manner. This is strictly a Linux hack, and
510 : should most likely only ever be used by the tunelp application. */
511 1 : if ((LP_F(minor) & LP_ABORTOPEN) && !(file->f_flags & O_NONBLOCK)) {
512 0 : int status;
513 0 : lp_claim_parport_or_block (&lp_table[minor]);
514 0 : status = r_str(minor);
515 0 : lp_release_parport (&lp_table[minor]);
516 0 : if (status & LP_POUTPA) {
517 0 : printk(KERN_INFO "lp%d out of paper\n", minor);
518 0 : LP_F(minor) &= ~LP_BUSY;
519 0 : return -ENOSPC;
520 0 : } else if (!(status & LP_PSELECD)) {
521 0 : printk(KERN_INFO "lp%d off-line\n", minor);
522 0 : LP_F(minor) &= ~LP_BUSY;
523 0 : return -EIO;
524 0 : } else if (!(status & LP_PERRORP)) {
525 0 : printk(KERN_ERR "lp%d printer error\n", minor);
526 0 : LP_F(minor) &= ~LP_BUSY;
527 0 : return -EIO;
528 : }
529 : }
530 1 : lp_table[minor].lp_buffer = (char *) kmalloc(LP_BUFFER_SIZE, GFP_KERNEL);
531 1 : if (!lp_table[minor].lp_buffer) {
532 0 : LP_F(minor) &= ~LP_BUSY;
533 0 : return -ENOMEM;
534 : }
535 : /* Determine if the peripheral supports ECP mode */
536 1 : lp_claim_parport_or_block (&lp_table[minor]);
537 1 : if ( (lp_table[minor].dev->port->modes & PARPORT_MODE_ECP) &&
538 : !parport_negotiate (lp_table[minor].dev->port,
539 : IEEE1284_MODE_ECP)) {
540 0 : printk (KERN_INFO "lp%d: ECP mode\n", minor);
541 0 : lp_table[minor].best_mode = IEEE1284_MODE_ECP;
542 : } else {
543 1 : lp_table[minor].best_mode = IEEE1284_MODE_COMPAT;
544 : }
545 : /* Leave peripheral in compatibility mode */
546 1 : parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
547 1 : lp_release_parport (&lp_table[minor]);
548 1 : lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
549 1 : return 0;
550 : }
551 :
552 : static int lp_release(struct inode * inode, struct file * file)
553 1 : {
554 1 : unsigned int minor = iminor(inode);
555 :
556 1 : lp_claim_parport_or_block (&lp_table[minor]);
557 1 : parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
558 1 : lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
559 1 : lp_release_parport (&lp_table[minor]);
560 1 : kfree(lp_table[minor].lp_buffer);
561 1 : lp_table[minor].lp_buffer = NULL;
562 1 : LP_F(minor) &= ~LP_BUSY;
563 1 : return 0;
564 : }
565 :
566 : static int lp_ioctl(struct inode *inode, struct file *file,
567 : unsigned int cmd, unsigned long arg)
568 0 : {
569 0 : unsigned int minor = iminor(inode);
570 0 : int status;
571 0 : int retval = 0;
572 0 : void __user *argp = (void __user *)arg;
573 :
574 : #ifdef LP_DEBUG
575 : printk(KERN_DEBUG "lp%d ioctl, cmd: 0x%x, arg: 0x%lx\n", minor, cmd, arg);
576 : #endif
577 0 : if (minor >= LP_NO)
578 0 : return -ENODEV;
579 0 : if ((LP_F(minor) & LP_EXIST) == 0)
580 0 : return -ENODEV;
581 0 : switch ( cmd ) {
582 0 : struct timeval par_timeout;
583 0 : long to_jiffies;
584 :
585 : case LPTIME:
586 0 : LP_TIME(minor) = arg * HZ/100;
587 0 : break;
588 : case LPCHAR:
589 0 : LP_CHAR(minor) = arg;
590 0 : break;
591 : case LPABORT:
592 0 : if (arg)
593 0 : LP_F(minor) |= LP_ABORT;
594 : else
595 0 : LP_F(minor) &= ~LP_ABORT;
596 0 : break;
597 : case LPABORTOPEN:
598 0 : if (arg)
599 0 : LP_F(minor) |= LP_ABORTOPEN;
600 : else
601 0 : LP_F(minor) &= ~LP_ABORTOPEN;
602 0 : break;
603 : case LPCAREFUL:
604 0 : if (arg)
605 0 : LP_F(minor) |= LP_CAREFUL;
606 : else
607 0 : LP_F(minor) &= ~LP_CAREFUL;
608 0 : break;
609 : case LPWAIT:
610 0 : LP_WAIT(minor) = arg;
611 0 : break;
612 : case LPSETIRQ:
613 0 : return -EINVAL;
614 : break;
615 : case LPGETIRQ:
616 0 : if (copy_to_user(argp, &LP_IRQ(minor),
617 : sizeof(int)))
618 0 : return -EFAULT;
619 0 : break;
620 : case LPGETSTATUS:
621 0 : lp_claim_parport_or_block (&lp_table[minor]);
622 0 : status = r_str(minor);
623 0 : lp_release_parport (&lp_table[minor]);
624 :
625 0 : if (copy_to_user(argp, &status, sizeof(int)))
626 0 : return -EFAULT;
627 0 : break;
628 : case LPRESET:
629 0 : lp_reset(minor);
630 0 : break;
631 : #ifdef LP_STATS
632 : case LPGETSTATS:
633 : if (copy_to_user(argp, &LP_STAT(minor),
634 : sizeof(struct lp_stats)))
635 : return -EFAULT;
636 : if (capable(CAP_SYS_ADMIN))
637 : memset(&LP_STAT(minor), 0,
638 : sizeof(struct lp_stats));
639 : break;
640 : #endif
641 : case LPGETFLAGS:
642 0 : status = LP_F(minor);
643 0 : if (copy_to_user(argp, &status, sizeof(int)))
644 0 : return -EFAULT;
645 0 : break;
646 :
647 : case LPSETTIMEOUT:
648 0 : if (copy_from_user (&par_timeout, argp,
649 : sizeof (struct timeval))) {
650 0 : return -EFAULT;
651 : }
652 : /* Convert to jiffies, place in lp_table */
653 0 : if ((par_timeout.tv_sec < 0) ||
654 : (par_timeout.tv_usec < 0)) {
655 0 : return -EINVAL;
656 : }
657 0 : to_jiffies = ROUND_UP(par_timeout.tv_usec, 1000000/HZ);
658 0 : to_jiffies += par_timeout.tv_sec * (long) HZ;
659 0 : if (to_jiffies <= 0) {
660 0 : return -EINVAL;
661 : }
662 0 : lp_table[minor].timeout = to_jiffies;
663 0 : break;
664 :
665 : default:
666 0 : retval = -EINVAL;
667 : }
668 0 : return retval;
669 : }
670 :
671 : static struct file_operations lp_fops = {
672 : .owner = THIS_MODULE,
673 : .write = lp_write,
674 : .ioctl = lp_ioctl,
675 : .open = lp_open,
676 : .release = lp_release,
677 : #ifdef CONFIG_PARPORT_1284
678 : .read = lp_read,
679 : #endif
680 : };
681 :
682 : /* --- support for console on the line printer ----------------- */
683 :
684 : #ifdef CONFIG_LP_CONSOLE
685 :
686 : #define CONSOLE_LP 0
687 :
688 : /* If the printer is out of paper, we can either lose the messages or
689 : * stall until the printer is happy again. Define CONSOLE_LP_STRICT
690 : * non-zero to get the latter behaviour. */
691 : #define CONSOLE_LP_STRICT 1
692 :
693 : /* The console must be locked when we get here. */
694 :
695 : static void lp_console_write (struct console *co, const char *s,
696 : unsigned count)
697 : {
698 : struct pardevice *dev = lp_table[CONSOLE_LP].dev;
699 : struct parport *port = dev->port;
700 : ssize_t written;
701 :
702 : if (parport_claim (dev))
703 : /* Nothing we can do. */
704 : return;
705 :
706 : parport_set_timeout (dev, 0);
707 :
708 : /* Go to compatibility mode. */
709 : parport_negotiate (port, IEEE1284_MODE_COMPAT);
710 :
711 : do {
712 : /* Write the data, converting LF->CRLF as we go. */
713 : ssize_t canwrite = count;
714 : char *lf = memchr (s, '\n', count);
715 : if (lf)
716 : canwrite = lf - s;
717 :
718 : if (canwrite > 0) {
719 : written = parport_write (port, s, canwrite);
720 :
721 : if (written <= 0)
722 : continue;
723 :
724 : s += written;
725 : count -= written;
726 : canwrite -= written;
727 : }
728 :
729 : if (lf && canwrite <= 0) {
730 : const char *crlf = "\r\n";
731 : int i = 2;
732 :
733 : /* Dodge the original '\n', and put '\r\n' instead. */
734 : s++;
735 : count--;
736 : do {
737 : written = parport_write (port, crlf, i);
738 : if (written > 0)
739 : i -= written, crlf += written;
740 : } while (i > 0 && (CONSOLE_LP_STRICT || written > 0));
741 : }
742 : } while (count > 0 && (CONSOLE_LP_STRICT || written > 0));
743 :
744 : parport_release (dev);
745 : }
746 :
747 : static struct console lpcons = {
748 : .name = "lp",
749 : .write = lp_console_write,
750 : .flags = CON_PRINTBUFFER,
751 : };
752 :
753 : #endif /* console on line printer */
754 :
755 : /* --- initialisation code ------------------------------------- */
756 :
757 : static int parport_nr[LP_NO] = { [0 ... LP_NO-1] = LP_PARPORT_UNSPEC };
758 : static char *parport[LP_NO] = { NULL, };
759 : static int reset = 0;
760 :
761 : module_param_array(parport, charp, NULL, 0);
762 : module_param(reset, bool, 0);
763 :
764 : #ifndef MODULE
765 : static int __init lp_setup (char *str)
766 0 : {
767 0 : static int parport_ptr; // initially zero
768 0 : int x;
769 :
770 0 : if (get_option (&str, &x)) {
771 0 : if (x == 0) {
772 : /* disable driver on "lp=" or "lp=0" */
773 0 : parport_nr[0] = LP_PARPORT_OFF;
774 : } else {
775 0 : printk(KERN_WARNING "warning: 'lp=0x%x' is deprecated, ignored\n", x);
776 0 : return 0;
777 : }
778 0 : } else if (!strncmp(str, "parport", 7)) {
779 0 : int n = simple_strtoul(str+7, NULL, 10);
780 0 : if (parport_ptr < LP_NO)
781 0 : parport_nr[parport_ptr++] = n;
782 : else
783 0 : printk(KERN_INFO "lp: too many ports, %s ignored.\n",
784 : str);
785 0 : } else if (!strcmp(str, "auto")) {
786 0 : parport_nr[0] = LP_PARPORT_AUTO;
787 0 : } else if (!strcmp(str, "none")) {
788 0 : parport_nr[parport_ptr++] = LP_PARPORT_NONE;
789 0 : } else if (!strcmp(str, "reset")) {
790 0 : reset = 1;
791 : }
792 0 : return 1;
793 : }
794 : #endif
795 :
796 : static int lp_register(int nr, struct parport *port)
797 1 : {
798 1 : lp_table[nr].dev = parport_register_device(port, "lp",
799 : lp_preempt, NULL, NULL, 0,
800 : (void *) &lp_table[nr]);
801 1 : if (lp_table[nr].dev == NULL)
802 0 : return 1;
803 1 : lp_table[nr].flags |= LP_EXIST;
804 :
805 1 : if (reset)
806 0 : lp_reset(nr);
807 :
808 1 : class_device_create(lp_class, MKDEV(LP_MAJOR, nr), NULL,
809 : "lp%d", nr);
810 1 : devfs_mk_cdev(MKDEV(LP_MAJOR, nr), S_IFCHR | S_IRUGO | S_IWUGO,
811 : "printers/%d", nr);
812 :
813 1 : printk(KERN_INFO "lp%d: using %s (%s).\n", nr, port->name,
814 : (port->irq == PARPORT_IRQ_NONE)?"polling":"interrupt-driven");
815 :
816 : #ifdef CONFIG_LP_CONSOLE
817 : if (!nr) {
818 : if (port->modes & PARPORT_MODE_SAFEININT) {
819 : register_console (&lpcons);
820 : console_registered = port;
821 : printk (KERN_INFO "lp%d: console ready\n", CONSOLE_LP);
822 : } else
823 : printk (KERN_ERR "lp%d: cannot run console on %s\n",
824 : CONSOLE_LP, port->name);
825 : }
826 : #endif
827 :
828 1 : return 0;
829 : }
830 :
831 : static void lp_attach (struct parport *port)
832 1 : {
833 1 : unsigned int i;
834 :
835 1 : switch (parport_nr[0])
836 : {
837 : case LP_PARPORT_UNSPEC:
838 : case LP_PARPORT_AUTO:
839 1 : if (parport_nr[0] == LP_PARPORT_AUTO &&
840 : port->probe_info[0].class != PARPORT_CLASS_PRINTER)
841 1 : return;
842 1 : if (lp_count == LP_NO) {
843 0 : printk(KERN_INFO "lp: ignoring parallel port (max. %d)\n",LP_NO);
844 0 : return;
845 : }
846 1 : if (!lp_register(lp_count, port))
847 1 : lp_count++;
848 1 : break;
849 :
850 : default:
851 0 : for (i = 0; i < LP_NO; i++) {
852 0 : if (port->number == parport_nr[i]) {
853 0 : if (!lp_register(i, port))
854 0 : lp_count++;
855 0 : break;
856 : }
857 : }
858 1 : break;
859 : }
860 : }
861 :
862 : static void lp_detach (struct parport *port)
863 0 : {
864 : /* Write this some day. */
865 : #ifdef CONFIG_LP_CONSOLE
866 : if (console_registered == port) {
867 : unregister_console (&lpcons);
868 : console_registered = NULL;
869 : }
870 : #endif /* CONFIG_LP_CONSOLE */
871 : }
872 :
873 : static struct parport_driver lp_driver = {
874 : .name = "lp",
875 : .attach = lp_attach,
876 : .detach = lp_detach,
877 : };
878 :
879 : static int __init lp_init (void)
880 1 : {
881 1 : int i, err = 0;
882 :
883 1 : if (parport_nr[0] == LP_PARPORT_OFF)
884 0 : return 0;
885 :
886 9 : for (i = 0; i < LP_NO; i++) {
887 8 : lp_table[i].dev = NULL;
888 8 : lp_table[i].flags = 0;
889 8 : lp_table[i].chars = LP_INIT_CHAR;
890 8 : lp_table[i].time = LP_INIT_TIME;
891 8 : lp_table[i].wait = LP_INIT_WAIT;
892 8 : lp_table[i].lp_buffer = NULL;
893 : #ifdef LP_STATS
894 : lp_table[i].lastcall = 0;
895 : lp_table[i].runchars = 0;
896 : memset (&lp_table[i].stats, 0, sizeof (struct lp_stats));
897 : #endif
898 8 : lp_table[i].last_error = 0;
899 8 : init_waitqueue_head (&lp_table[i].waitq);
900 8 : init_waitqueue_head (&lp_table[i].dataq);
901 8 : init_MUTEX (&lp_table[i].port_mutex);
902 8 : lp_table[i].timeout = 10 * HZ;
903 : }
904 :
905 1 : if (register_chrdev (LP_MAJOR, "lp", &lp_fops)) {
906 0 : printk (KERN_ERR "lp: unable to get major %d\n", LP_MAJOR);
907 0 : return -EIO;
908 : }
909 :
910 1 : devfs_mk_dir("printers");
911 1 : lp_class = class_create(THIS_MODULE, "printer");
912 1 : if (IS_ERR(lp_class)) {
913 0 : err = PTR_ERR(lp_class);
914 0 : goto out_devfs;
915 : }
916 :
917 1 : if (parport_register_driver (&lp_driver)) {
918 1 : printk (KERN_ERR "lp: unable to register with parport\n");
919 0 : err = -EIO;
920 0 : goto out_class;
921 : }
922 :
923 1 : if (!lp_count) {
924 1 : printk (KERN_INFO "lp: driver loaded but no devices found\n");
925 : #ifndef CONFIG_PARPORT_1284
926 1 : if (parport_nr[0] == LP_PARPORT_AUTO)
927 0 : printk (KERN_INFO "lp: (is IEEE 1284 support enabled?)\n");
928 : #endif
929 : }
930 :
931 1 : return 0;
932 :
933 : out_class:
934 0 : class_destroy(lp_class);
935 : out_devfs:
936 0 : devfs_remove("printers");
937 0 : unregister_chrdev(LP_MAJOR, "lp");
938 0 : return err;
939 : }
940 :
941 : static int __init lp_init_module (void)
942 1 : {
943 1 : if (parport[0]) {
944 : /* The user gave some parameters. Let's see what they were. */
945 0 : if (!strncmp(parport[0], "auto", 4))
946 0 : parport_nr[0] = LP_PARPORT_AUTO;
947 : else {
948 0 : int n;
949 0 : for (n = 0; n < LP_NO && parport[n]; n++) {
950 0 : if (!strncmp(parport[n], "none", 4))
951 0 : parport_nr[n] = LP_PARPORT_NONE;
952 : else {
953 0 : char *ep;
954 0 : unsigned long r = simple_strtoul(parport[n], &ep, 0);
955 0 : if (ep != parport[n])
956 0 : parport_nr[n] = r;
957 : else {
958 0 : printk(KERN_ERR "lp: bad port specifier `%s'\n", parport[n]);
959 0 : return -ENODEV;
960 : }
961 : }
962 : }
963 : }
964 : }
965 :
966 1 : return lp_init();
967 : }
968 :
969 : static void lp_cleanup_module (void)
970 0 : {
971 0 : unsigned int offset;
972 :
973 0 : parport_unregister_driver (&lp_driver);
974 :
975 : #ifdef CONFIG_LP_CONSOLE
976 : unregister_console (&lpcons);
977 : #endif
978 :
979 0 : unregister_chrdev(LP_MAJOR, "lp");
980 0 : for (offset = 0; offset < LP_NO; offset++) {
981 0 : if (lp_table[offset].dev == NULL)
982 0 : continue;
983 0 : parport_unregister_device(lp_table[offset].dev);
984 0 : devfs_remove("printers/%d", offset);
985 0 : class_device_destroy(lp_class, MKDEV(LP_MAJOR, offset));
986 : }
987 0 : devfs_remove("printers");
988 0 : class_destroy(lp_class);
989 : }
990 :
991 : __setup("lp=", lp_setup);
992 : module_init(lp_init_module);
993 : module_exit(lp_cleanup_module);
994 :
995 : MODULE_ALIAS_CHARDEV_MAJOR(LP_MAJOR);
996 : MODULE_LICENSE("GPL");
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