1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * Generic parallel printer driver |
4 | * |
5 | * Copyright (C) 1992 by Jim Weigand and Linus Torvalds |
6 | * Copyright (C) 1992,1993 by Michael K. Johnson |
7 | * - Thanks much to Gunter Windau for pointing out to me where the error |
8 | * checking ought to be. |
9 | * Copyright (C) 1993 by Nigel Gamble (added interrupt code) |
10 | * Copyright (C) 1994 by Alan Cox (Modularised it) |
11 | * LPCAREFUL, LPABORT, LPGETSTATUS added by Chris Metcalf, metcalf@lcs.mit.edu |
12 | * Statistics and support for slow printers by Rob Janssen, rob@knoware.nl |
13 | * "lp=" command line parameters added by Grant Guenther, grant@torque.net |
14 | * lp_read (Status readback) support added by Carsten Gross, |
15 | * carsten@sol.wohnheim.uni-ulm.de |
16 | * Support for parport by Philip Blundell <philb@gnu.org> |
17 | * Parport sharing hacking by Andrea Arcangeli |
18 | * Fixed kernel_(to/from)_user memory copy to check for errors |
19 | * by Riccardo Facchetti <fizban@tin.it> |
20 | * 22-JAN-1998 Added support for devfs Richard Gooch <rgooch@atnf.csiro.au> |
21 | * Redesigned interrupt handling for handle printers with buggy handshake |
22 | * by Andrea Arcangeli, 11 May 1998 |
23 | * Full efficient handling of printer with buggy irq handshake (now I have |
24 | * understood the meaning of the strange handshake). This is done sending new |
25 | * characters if the interrupt is just happened, even if the printer say to |
26 | * be still BUSY. This is needed at least with Epson Stylus Color. To enable |
27 | * the new TRUST_IRQ mode read the `LP OPTIMIZATION' section below... |
28 | * Fixed the irq on the rising edge of the strobe case. |
29 | * Obsoleted the CAREFUL flag since a printer that doesn' t work with |
30 | * CAREFUL will block a bit after in lp_check_status(). |
31 | * Andrea Arcangeli, 15 Oct 1998 |
32 | * Obsoleted and removed all the lowlevel stuff implemented in the last |
33 | * month to use the IEEE1284 functions (that handle the _new_ compatibilty |
34 | * mode fine). |
35 | */ |
36 | |
37 | /* This driver should, in theory, work with any parallel port that has an |
38 | * appropriate low-level driver; all I/O is done through the parport |
39 | * abstraction layer. |
40 | * |
41 | * If this driver is built into the kernel, you can configure it using the |
42 | * kernel command-line. For example: |
43 | * |
44 | * lp=parport1,none,parport2 (bind lp0 to parport1, disable lp1 and |
45 | * bind lp2 to parport2) |
46 | * |
47 | * lp=auto (assign lp devices to all ports that |
48 | * have printers attached, as determined |
49 | * by the IEEE-1284 autoprobe) |
50 | * |
51 | * lp=reset (reset the printer during |
52 | * initialisation) |
53 | * |
54 | * lp=off (disable the printer driver entirely) |
55 | * |
56 | * If the driver is loaded as a module, similar functionality is available |
57 | * using module parameters. The equivalent of the above commands would be: |
58 | * |
59 | * # insmod lp.o parport=1,none,2 |
60 | * |
61 | * # insmod lp.o parport=auto |
62 | * |
63 | * # insmod lp.o reset=1 |
64 | */ |
65 | |
66 | /* COMPATIBILITY WITH OLD KERNELS |
67 | * |
68 | * Under Linux 2.0 and previous versions, lp devices were bound to ports at |
69 | * particular I/O addresses, as follows: |
70 | * |
71 | * lp0 0x3bc |
72 | * lp1 0x378 |
73 | * lp2 0x278 |
74 | * |
75 | * The new driver, by default, binds lp devices to parport devices as it |
76 | * finds them. This means that if you only have one port, it will be bound |
77 | * to lp0 regardless of its I/O address. If you need the old behaviour, you |
78 | * can force it using the parameters described above. |
79 | */ |
80 | |
81 | /* |
82 | * The new interrupt handling code take care of the buggy handshake |
83 | * of some HP and Epson printer: |
84 | * ___ |
85 | * ACK _______________ ___________ |
86 | * |__| |
87 | * ____ |
88 | * BUSY _________ _______ |
89 | * |____________| |
90 | * |
91 | * I discovered this using the printer scanner that you can find at: |
92 | * |
93 | * ftp://e-mind.com/pub/linux/pscan/ |
94 | * |
95 | * 11 May 98, Andrea Arcangeli |
96 | * |
97 | * My printer scanner run on an Epson Stylus Color show that such printer |
98 | * generates the irq on the _rising_ edge of the STROBE. Now lp handle |
99 | * this case fine too. |
100 | * |
101 | * 15 Oct 1998, Andrea Arcangeli |
102 | * |
103 | * The so called `buggy' handshake is really the well documented |
104 | * compatibility mode IEEE1284 handshake. They changed the well known |
105 | * Centronics handshake acking in the middle of busy expecting to not |
106 | * break drivers or legacy application, while they broken linux lp |
107 | * until I fixed it reverse engineering the protocol by hand some |
108 | * month ago... |
109 | * |
110 | * 14 Dec 1998, Andrea Arcangeli |
111 | * |
112 | * Copyright (C) 2000 by Tim Waugh (added LPSETTIMEOUT ioctl) |
113 | */ |
114 | |
115 | #include <linux/module.h> |
116 | #include <linux/init.h> |
117 | |
118 | #include <linux/errno.h> |
119 | #include <linux/kernel.h> |
120 | #include <linux/major.h> |
121 | #include <linux/sched/signal.h> |
122 | #include <linux/slab.h> |
123 | #include <linux/fcntl.h> |
124 | #include <linux/delay.h> |
125 | #include <linux/poll.h> |
126 | #include <linux/console.h> |
127 | #include <linux/device.h> |
128 | #include <linux/wait.h> |
129 | #include <linux/jiffies.h> |
130 | #include <linux/mutex.h> |
131 | #include <linux/compat.h> |
132 | |
133 | #include <linux/parport.h> |
134 | #undef LP_STATS |
135 | #include <linux/lp.h> |
136 | |
137 | #include <asm/irq.h> |
138 | #include <linux/uaccess.h> |
139 | |
140 | /* if you have more than 8 printers, remember to increase LP_NO */ |
141 | #define LP_NO 8 |
142 | |
143 | static DEFINE_MUTEX(lp_mutex); |
144 | static struct lp_struct lp_table[LP_NO]; |
145 | static int port_num[LP_NO]; |
146 | |
147 | static unsigned int lp_count = 0; |
148 | static const struct class lp_class = { |
149 | .name = "printer" , |
150 | }; |
151 | |
152 | #ifdef CONFIG_LP_CONSOLE |
153 | static struct parport *console_registered; |
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 | { |
172 | if (!test_and_set_bit(LP_PARPORT_CLAIMED, addr: &this_lp->bits)) { |
173 | parport_claim_or_block(dev: 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 | { |
180 | if (test_and_clear_bit(LP_PARPORT_CLAIMED, addr: &this_lp->bits)) { |
181 | parport_release(dev: this_lp->dev); |
182 | } |
183 | } |
184 | |
185 | |
186 | |
187 | static int lp_preempt(void *handle) |
188 | { |
189 | struct lp_struct *this_lp = (struct lp_struct *)handle; |
190 | set_bit(LP_PREEMPT_REQUEST, addr: &this_lp->bits); |
191 | 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 | { |
201 | if (parport_negotiate(port, mode) != 0) { |
202 | mode = IEEE1284_MODE_COMPAT; |
203 | parport_negotiate(port, mode); |
204 | } |
205 | |
206 | return mode; |
207 | } |
208 | |
209 | static int lp_reset(int minor) |
210 | { |
211 | int retval; |
212 | lp_claim_parport_or_block(this_lp: &lp_table[minor]); |
213 | w_ctr(minor, LP_PSELECP); |
214 | udelay(LP_DELAY); |
215 | w_ctr(minor, LP_PSELECP | LP_PINITP); |
216 | retval = r_str(minor); |
217 | lp_release_parport(this_lp: &lp_table[minor]); |
218 | return retval; |
219 | } |
220 | |
221 | static void lp_error(int minor) |
222 | { |
223 | DEFINE_WAIT(wait); |
224 | int polling; |
225 | |
226 | if (LP_F(minor) & LP_ABORT) |
227 | return; |
228 | |
229 | polling = lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE; |
230 | if (polling) |
231 | lp_release_parport(this_lp: &lp_table[minor]); |
232 | prepare_to_wait(wq_head: &lp_table[minor].waitq, wq_entry: &wait, TASK_INTERRUPTIBLE); |
233 | schedule_timeout(LP_TIMEOUT_POLLED); |
234 | finish_wait(wq_head: &lp_table[minor].waitq, wq_entry: &wait); |
235 | if (polling) |
236 | lp_claim_parport_or_block(this_lp: &lp_table[minor]); |
237 | else |
238 | parport_yield_blocking(dev: lp_table[minor].dev); |
239 | } |
240 | |
241 | static int lp_check_status(int minor) |
242 | { |
243 | int error = 0; |
244 | unsigned int last = lp_table[minor].last_error; |
245 | unsigned char status = r_str(minor); |
246 | if ((status & LP_PERRORP) && !(LP_F(minor) & LP_CAREFUL)) |
247 | /* No error. */ |
248 | last = 0; |
249 | else if ((status & LP_POUTPA)) { |
250 | if (last != LP_POUTPA) { |
251 | last = LP_POUTPA; |
252 | printk(KERN_INFO "lp%d out of paper\n" , minor); |
253 | } |
254 | error = -ENOSPC; |
255 | } else if (!(status & LP_PSELECD)) { |
256 | if (last != LP_PSELECD) { |
257 | last = LP_PSELECD; |
258 | printk(KERN_INFO "lp%d off-line\n" , minor); |
259 | } |
260 | error = -EIO; |
261 | } else if (!(status & LP_PERRORP)) { |
262 | if (last != LP_PERRORP) { |
263 | last = LP_PERRORP; |
264 | printk(KERN_INFO "lp%d on fire\n" , minor); |
265 | } |
266 | error = -EIO; |
267 | } else { |
268 | last = 0; /* Come here if LP_CAREFUL is set and no |
269 | errors are reported. */ |
270 | } |
271 | |
272 | lp_table[minor].last_error = last; |
273 | |
274 | if (last != 0) |
275 | lp_error(minor); |
276 | |
277 | return error; |
278 | } |
279 | |
280 | static int lp_wait_ready(int minor, int nonblock) |
281 | { |
282 | int error = 0; |
283 | |
284 | /* If we're not in compatibility mode, we're ready now! */ |
285 | if (lp_table[minor].current_mode != IEEE1284_MODE_COMPAT) { |
286 | return 0; |
287 | } |
288 | |
289 | do { |
290 | error = lp_check_status(minor); |
291 | if (error && (nonblock || (LP_F(minor) & LP_ABORT))) |
292 | break; |
293 | if (signal_pending(current)) { |
294 | error = -EINTR; |
295 | break; |
296 | } |
297 | } while (error); |
298 | return error; |
299 | } |
300 | |
301 | static ssize_t lp_write(struct file *file, const char __user *buf, |
302 | size_t count, loff_t *ppos) |
303 | { |
304 | unsigned int minor = iminor(inode: file_inode(f: file)); |
305 | struct parport *port = lp_table[minor].dev->port; |
306 | char *kbuf = lp_table[minor].lp_buffer; |
307 | ssize_t retv = 0; |
308 | ssize_t written; |
309 | size_t copy_size = count; |
310 | int nonblock = ((file->f_flags & O_NONBLOCK) || |
311 | (LP_F(minor) & LP_ABORT)); |
312 | |
313 | #ifdef LP_STATS |
314 | if (time_after(jiffies, lp_table[minor].lastcall + LP_TIME(minor))) |
315 | lp_table[minor].runchars = 0; |
316 | |
317 | lp_table[minor].lastcall = jiffies; |
318 | #endif |
319 | |
320 | /* Need to copy the data from user-space. */ |
321 | if (copy_size > LP_BUFFER_SIZE) |
322 | copy_size = LP_BUFFER_SIZE; |
323 | |
324 | if (mutex_lock_interruptible(&lp_table[minor].port_mutex)) |
325 | return -EINTR; |
326 | |
327 | if (copy_from_user(to: kbuf, from: buf, n: copy_size)) { |
328 | retv = -EFAULT; |
329 | goto out_unlock; |
330 | } |
331 | |
332 | /* Claim Parport or sleep until it becomes available |
333 | */ |
334 | lp_claim_parport_or_block(this_lp: &lp_table[minor]); |
335 | /* Go to the proper mode. */ |
336 | lp_table[minor].current_mode = lp_negotiate(port, |
337 | mode: lp_table[minor].best_mode); |
338 | |
339 | parport_set_timeout(lp_table[minor].dev, |
340 | inactivity: (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK |
341 | : lp_table[minor].timeout)); |
342 | |
343 | if ((retv = lp_wait_ready(minor, nonblock)) == 0) |
344 | do { |
345 | /* Write the data. */ |
346 | written = parport_write(port, buf: kbuf, len: copy_size); |
347 | if (written > 0) { |
348 | copy_size -= written; |
349 | count -= written; |
350 | buf += written; |
351 | retv += written; |
352 | } |
353 | |
354 | if (signal_pending(current)) { |
355 | if (retv == 0) |
356 | retv = -EINTR; |
357 | |
358 | break; |
359 | } |
360 | |
361 | if (copy_size > 0) { |
362 | /* incomplete write -> check error ! */ |
363 | int error; |
364 | |
365 | parport_negotiate(lp_table[minor].dev->port, |
366 | IEEE1284_MODE_COMPAT); |
367 | lp_table[minor].current_mode = IEEE1284_MODE_COMPAT; |
368 | |
369 | error = lp_wait_ready(minor, nonblock); |
370 | |
371 | if (error) { |
372 | if (retv == 0) |
373 | retv = error; |
374 | break; |
375 | } else if (nonblock) { |
376 | if (retv == 0) |
377 | retv = -EAGAIN; |
378 | break; |
379 | } |
380 | |
381 | parport_yield_blocking(dev: lp_table[minor].dev); |
382 | lp_table[minor].current_mode |
383 | = lp_negotiate(port, |
384 | mode: lp_table[minor].best_mode); |
385 | |
386 | } else if (need_resched()) |
387 | schedule(); |
388 | |
389 | if (count) { |
390 | copy_size = count; |
391 | if (copy_size > LP_BUFFER_SIZE) |
392 | copy_size = LP_BUFFER_SIZE; |
393 | |
394 | if (copy_from_user(to: kbuf, from: buf, n: copy_size)) { |
395 | if (retv == 0) |
396 | retv = -EFAULT; |
397 | break; |
398 | } |
399 | } |
400 | } while (count > 0); |
401 | |
402 | if (test_and_clear_bit(LP_PREEMPT_REQUEST, |
403 | addr: &lp_table[minor].bits)) { |
404 | printk(KERN_INFO "lp%d releasing parport\n" , minor); |
405 | parport_negotiate(lp_table[minor].dev->port, |
406 | IEEE1284_MODE_COMPAT); |
407 | lp_table[minor].current_mode = IEEE1284_MODE_COMPAT; |
408 | lp_release_parport(this_lp: &lp_table[minor]); |
409 | } |
410 | out_unlock: |
411 | mutex_unlock(lock: &lp_table[minor].port_mutex); |
412 | |
413 | return retv; |
414 | } |
415 | |
416 | #ifdef CONFIG_PARPORT_1284 |
417 | |
418 | /* Status readback conforming to ieee1284 */ |
419 | static ssize_t lp_read(struct file *file, char __user *buf, |
420 | size_t count, loff_t *ppos) |
421 | { |
422 | DEFINE_WAIT(wait); |
423 | unsigned int minor=iminor(inode: file_inode(f: file)); |
424 | struct parport *port = lp_table[minor].dev->port; |
425 | ssize_t retval = 0; |
426 | char *kbuf = lp_table[minor].lp_buffer; |
427 | int nonblock = ((file->f_flags & O_NONBLOCK) || |
428 | (LP_F(minor) & LP_ABORT)); |
429 | |
430 | if (count > LP_BUFFER_SIZE) |
431 | count = LP_BUFFER_SIZE; |
432 | |
433 | if (mutex_lock_interruptible(&lp_table[minor].port_mutex)) |
434 | return -EINTR; |
435 | |
436 | lp_claim_parport_or_block(this_lp: &lp_table[minor]); |
437 | |
438 | parport_set_timeout(lp_table[minor].dev, |
439 | inactivity: (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK |
440 | : lp_table[minor].timeout)); |
441 | |
442 | parport_negotiate(lp_table[minor].dev->port, IEEE1284_MODE_COMPAT); |
443 | if (parport_negotiate(lp_table[minor].dev->port, |
444 | IEEE1284_MODE_NIBBLE)) { |
445 | retval = -EIO; |
446 | goto out; |
447 | } |
448 | |
449 | while (retval == 0) { |
450 | retval = parport_read(port, buf: kbuf, len: count); |
451 | |
452 | if (retval > 0) |
453 | break; |
454 | |
455 | if (nonblock) { |
456 | retval = -EAGAIN; |
457 | break; |
458 | } |
459 | |
460 | /* Wait for data. */ |
461 | |
462 | if (lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE) { |
463 | parport_negotiate(lp_table[minor].dev->port, |
464 | IEEE1284_MODE_COMPAT); |
465 | lp_error(minor); |
466 | if (parport_negotiate(lp_table[minor].dev->port, |
467 | IEEE1284_MODE_NIBBLE)) { |
468 | retval = -EIO; |
469 | goto out; |
470 | } |
471 | } else { |
472 | prepare_to_wait(wq_head: &lp_table[minor].waitq, wq_entry: &wait, TASK_INTERRUPTIBLE); |
473 | schedule_timeout(LP_TIMEOUT_POLLED); |
474 | finish_wait(wq_head: &lp_table[minor].waitq, wq_entry: &wait); |
475 | } |
476 | |
477 | if (signal_pending(current)) { |
478 | retval = -ERESTARTSYS; |
479 | break; |
480 | } |
481 | |
482 | cond_resched(); |
483 | } |
484 | parport_negotiate(lp_table[minor].dev->port, IEEE1284_MODE_COMPAT); |
485 | out: |
486 | lp_release_parport(this_lp: &lp_table[minor]); |
487 | |
488 | if (retval > 0 && copy_to_user(to: buf, from: kbuf, n: retval)) |
489 | retval = -EFAULT; |
490 | |
491 | mutex_unlock(lock: &lp_table[minor].port_mutex); |
492 | |
493 | return retval; |
494 | } |
495 | |
496 | #endif /* IEEE 1284 support */ |
497 | |
498 | static int lp_open(struct inode *inode, struct file *file) |
499 | { |
500 | unsigned int minor = iminor(inode); |
501 | int ret = 0; |
502 | |
503 | mutex_lock(&lp_mutex); |
504 | if (minor >= LP_NO) { |
505 | ret = -ENXIO; |
506 | goto out; |
507 | } |
508 | if ((LP_F(minor) & LP_EXIST) == 0) { |
509 | ret = -ENXIO; |
510 | goto out; |
511 | } |
512 | if (test_and_set_bit(LP_BUSY_BIT_POS, addr: &LP_F(minor))) { |
513 | ret = -EBUSY; |
514 | goto out; |
515 | } |
516 | /* If ABORTOPEN is set and the printer is offline or out of paper, |
517 | we may still want to open it to perform ioctl()s. Therefore we |
518 | have commandeered O_NONBLOCK, even though it is being used in |
519 | a non-standard manner. This is strictly a Linux hack, and |
520 | should most likely only ever be used by the tunelp application. */ |
521 | if ((LP_F(minor) & LP_ABORTOPEN) && !(file->f_flags & O_NONBLOCK)) { |
522 | int status; |
523 | lp_claim_parport_or_block(this_lp: &lp_table[minor]); |
524 | status = r_str(minor); |
525 | lp_release_parport(this_lp: &lp_table[minor]); |
526 | if (status & LP_POUTPA) { |
527 | printk(KERN_INFO "lp%d out of paper\n" , minor); |
528 | LP_F(minor) &= ~LP_BUSY; |
529 | ret = -ENOSPC; |
530 | goto out; |
531 | } else if (!(status & LP_PSELECD)) { |
532 | printk(KERN_INFO "lp%d off-line\n" , minor); |
533 | LP_F(minor) &= ~LP_BUSY; |
534 | ret = -EIO; |
535 | goto out; |
536 | } else if (!(status & LP_PERRORP)) { |
537 | printk(KERN_ERR "lp%d printer error\n" , minor); |
538 | LP_F(minor) &= ~LP_BUSY; |
539 | ret = -EIO; |
540 | goto out; |
541 | } |
542 | } |
543 | lp_table[minor].lp_buffer = kmalloc(LP_BUFFER_SIZE, GFP_KERNEL); |
544 | if (!lp_table[minor].lp_buffer) { |
545 | LP_F(minor) &= ~LP_BUSY; |
546 | ret = -ENOMEM; |
547 | goto out; |
548 | } |
549 | /* Determine if the peripheral supports ECP mode */ |
550 | lp_claim_parport_or_block(this_lp: &lp_table[minor]); |
551 | if ((lp_table[minor].dev->port->modes & PARPORT_MODE_ECP) && |
552 | !parport_negotiate(lp_table[minor].dev->port, |
553 | IEEE1284_MODE_ECP)) { |
554 | printk(KERN_INFO "lp%d: ECP mode\n" , minor); |
555 | lp_table[minor].best_mode = IEEE1284_MODE_ECP; |
556 | } else { |
557 | lp_table[minor].best_mode = IEEE1284_MODE_COMPAT; |
558 | } |
559 | /* Leave peripheral in compatibility mode */ |
560 | parport_negotiate(lp_table[minor].dev->port, IEEE1284_MODE_COMPAT); |
561 | lp_release_parport(this_lp: &lp_table[minor]); |
562 | lp_table[minor].current_mode = IEEE1284_MODE_COMPAT; |
563 | out: |
564 | mutex_unlock(lock: &lp_mutex); |
565 | return ret; |
566 | } |
567 | |
568 | static int lp_release(struct inode *inode, struct file *file) |
569 | { |
570 | unsigned int minor = iminor(inode); |
571 | |
572 | lp_claim_parport_or_block(this_lp: &lp_table[minor]); |
573 | parport_negotiate(lp_table[minor].dev->port, IEEE1284_MODE_COMPAT); |
574 | lp_table[minor].current_mode = IEEE1284_MODE_COMPAT; |
575 | lp_release_parport(this_lp: &lp_table[minor]); |
576 | kfree(objp: lp_table[minor].lp_buffer); |
577 | lp_table[minor].lp_buffer = NULL; |
578 | LP_F(minor) &= ~LP_BUSY; |
579 | return 0; |
580 | } |
581 | |
582 | static int lp_do_ioctl(unsigned int minor, unsigned int cmd, |
583 | unsigned long arg, void __user *argp) |
584 | { |
585 | int status; |
586 | int retval = 0; |
587 | |
588 | #ifdef LP_DEBUG |
589 | printk(KERN_DEBUG "lp%d ioctl, cmd: 0x%x, arg: 0x%lx\n" , minor, cmd, arg); |
590 | #endif |
591 | if (minor >= LP_NO) |
592 | return -ENODEV; |
593 | if ((LP_F(minor) & LP_EXIST) == 0) |
594 | return -ENODEV; |
595 | switch (cmd) { |
596 | case LPTIME: |
597 | if (arg > UINT_MAX / HZ) |
598 | return -EINVAL; |
599 | LP_TIME(minor) = arg * HZ/100; |
600 | break; |
601 | case LPCHAR: |
602 | LP_CHAR(minor) = arg; |
603 | break; |
604 | case LPABORT: |
605 | if (arg) |
606 | LP_F(minor) |= LP_ABORT; |
607 | else |
608 | LP_F(minor) &= ~LP_ABORT; |
609 | break; |
610 | case LPABORTOPEN: |
611 | if (arg) |
612 | LP_F(minor) |= LP_ABORTOPEN; |
613 | else |
614 | LP_F(minor) &= ~LP_ABORTOPEN; |
615 | break; |
616 | case LPCAREFUL: |
617 | if (arg) |
618 | LP_F(minor) |= LP_CAREFUL; |
619 | else |
620 | LP_F(minor) &= ~LP_CAREFUL; |
621 | break; |
622 | case LPWAIT: |
623 | LP_WAIT(minor) = arg; |
624 | break; |
625 | case LPSETIRQ: |
626 | return -EINVAL; |
627 | case LPGETIRQ: |
628 | if (copy_to_user(to: argp, from: &LP_IRQ(minor), |
629 | n: sizeof(int))) |
630 | return -EFAULT; |
631 | break; |
632 | case LPGETSTATUS: |
633 | if (mutex_lock_interruptible(&lp_table[minor].port_mutex)) |
634 | return -EINTR; |
635 | lp_claim_parport_or_block(this_lp: &lp_table[minor]); |
636 | status = r_str(minor); |
637 | lp_release_parport(this_lp: &lp_table[minor]); |
638 | mutex_unlock(lock: &lp_table[minor].port_mutex); |
639 | |
640 | if (copy_to_user(to: argp, from: &status, n: sizeof(int))) |
641 | return -EFAULT; |
642 | break; |
643 | case LPRESET: |
644 | lp_reset(minor); |
645 | break; |
646 | #ifdef LP_STATS |
647 | case LPGETSTATS: |
648 | if (copy_to_user(argp, &LP_STAT(minor), |
649 | sizeof(struct lp_stats))) |
650 | return -EFAULT; |
651 | if (capable(CAP_SYS_ADMIN)) |
652 | memset(&LP_STAT(minor), 0, |
653 | sizeof(struct lp_stats)); |
654 | break; |
655 | #endif |
656 | case LPGETFLAGS: |
657 | status = LP_F(minor); |
658 | if (copy_to_user(to: argp, from: &status, n: sizeof(int))) |
659 | return -EFAULT; |
660 | break; |
661 | |
662 | default: |
663 | retval = -EINVAL; |
664 | } |
665 | return retval; |
666 | } |
667 | |
668 | static int lp_set_timeout(unsigned int minor, s64 tv_sec, long tv_usec) |
669 | { |
670 | long to_jiffies; |
671 | |
672 | /* Convert to jiffies, place in lp_table */ |
673 | if (tv_sec < 0 || tv_usec < 0) |
674 | return -EINVAL; |
675 | |
676 | /* |
677 | * we used to not check, so let's not make this fatal, |
678 | * but deal with user space passing a 32-bit tv_nsec in |
679 | * a 64-bit field, capping the timeout to 1 second |
680 | * worth of microseconds, and capping the total at |
681 | * MAX_JIFFY_OFFSET. |
682 | */ |
683 | if (tv_usec > 999999) |
684 | tv_usec = 999999; |
685 | |
686 | if (tv_sec >= MAX_SEC_IN_JIFFIES - 1) { |
687 | to_jiffies = MAX_JIFFY_OFFSET; |
688 | } else { |
689 | to_jiffies = DIV_ROUND_UP(tv_usec, 1000000/HZ); |
690 | to_jiffies += tv_sec * (long) HZ; |
691 | } |
692 | |
693 | if (to_jiffies <= 0) { |
694 | return -EINVAL; |
695 | } |
696 | lp_table[minor].timeout = to_jiffies; |
697 | return 0; |
698 | } |
699 | |
700 | static int lp_set_timeout32(unsigned int minor, void __user *arg) |
701 | { |
702 | s32 karg[2]; |
703 | |
704 | if (copy_from_user(to: karg, from: arg, n: sizeof(karg))) |
705 | return -EFAULT; |
706 | |
707 | return lp_set_timeout(minor, tv_sec: karg[0], tv_usec: karg[1]); |
708 | } |
709 | |
710 | static int lp_set_timeout64(unsigned int minor, void __user *arg) |
711 | { |
712 | s64 karg[2]; |
713 | |
714 | if (copy_from_user(to: karg, from: arg, n: sizeof(karg))) |
715 | return -EFAULT; |
716 | |
717 | /* sparc64 suseconds_t is 32-bit only */ |
718 | if (IS_ENABLED(CONFIG_SPARC64) && !in_compat_syscall()) |
719 | karg[1] >>= 32; |
720 | |
721 | return lp_set_timeout(minor, tv_sec: karg[0], tv_usec: karg[1]); |
722 | } |
723 | |
724 | static long lp_ioctl(struct file *file, unsigned int cmd, |
725 | unsigned long arg) |
726 | { |
727 | unsigned int minor; |
728 | int ret; |
729 | |
730 | minor = iminor(inode: file_inode(f: file)); |
731 | mutex_lock(&lp_mutex); |
732 | switch (cmd) { |
733 | case LPSETTIMEOUT_OLD: |
734 | if (BITS_PER_LONG == 32) { |
735 | ret = lp_set_timeout32(minor, arg: (void __user *)arg); |
736 | break; |
737 | } |
738 | fallthrough; /* for 64-bit */ |
739 | case LPSETTIMEOUT_NEW: |
740 | ret = lp_set_timeout64(minor, arg: (void __user *)arg); |
741 | break; |
742 | default: |
743 | ret = lp_do_ioctl(minor, cmd, arg, argp: (void __user *)arg); |
744 | break; |
745 | } |
746 | mutex_unlock(lock: &lp_mutex); |
747 | |
748 | return ret; |
749 | } |
750 | |
751 | #ifdef CONFIG_COMPAT |
752 | static long lp_compat_ioctl(struct file *file, unsigned int cmd, |
753 | unsigned long arg) |
754 | { |
755 | unsigned int minor; |
756 | int ret; |
757 | |
758 | minor = iminor(inode: file_inode(f: file)); |
759 | mutex_lock(&lp_mutex); |
760 | switch (cmd) { |
761 | case LPSETTIMEOUT_OLD: |
762 | if (!COMPAT_USE_64BIT_TIME) { |
763 | ret = lp_set_timeout32(minor, arg: (void __user *)arg); |
764 | break; |
765 | } |
766 | fallthrough; /* for x32 mode */ |
767 | case LPSETTIMEOUT_NEW: |
768 | ret = lp_set_timeout64(minor, arg: (void __user *)arg); |
769 | break; |
770 | #ifdef LP_STATS |
771 | case LPGETSTATS: |
772 | /* FIXME: add an implementation if you set LP_STATS */ |
773 | ret = -EINVAL; |
774 | break; |
775 | #endif |
776 | default: |
777 | ret = lp_do_ioctl(minor, cmd, arg, argp: compat_ptr(uptr: arg)); |
778 | break; |
779 | } |
780 | mutex_unlock(lock: &lp_mutex); |
781 | |
782 | return ret; |
783 | } |
784 | #endif |
785 | |
786 | static const struct file_operations lp_fops = { |
787 | .owner = THIS_MODULE, |
788 | .write = lp_write, |
789 | .unlocked_ioctl = lp_ioctl, |
790 | #ifdef CONFIG_COMPAT |
791 | .compat_ioctl = lp_compat_ioctl, |
792 | #endif |
793 | .open = lp_open, |
794 | .release = lp_release, |
795 | #ifdef CONFIG_PARPORT_1284 |
796 | .read = lp_read, |
797 | #endif |
798 | .llseek = noop_llseek, |
799 | }; |
800 | |
801 | /* --- support for console on the line printer ----------------- */ |
802 | |
803 | #ifdef CONFIG_LP_CONSOLE |
804 | |
805 | #define CONSOLE_LP 0 |
806 | |
807 | /* If the printer is out of paper, we can either lose the messages or |
808 | * stall until the printer is happy again. Define CONSOLE_LP_STRICT |
809 | * non-zero to get the latter behaviour. */ |
810 | #define CONSOLE_LP_STRICT 1 |
811 | |
812 | /* The console must be locked when we get here. */ |
813 | |
814 | static void lp_console_write(struct console *co, const char *s, |
815 | unsigned count) |
816 | { |
817 | struct pardevice *dev = lp_table[CONSOLE_LP].dev; |
818 | struct parport *port = dev->port; |
819 | ssize_t written; |
820 | |
821 | if (parport_claim(dev)) |
822 | /* Nothing we can do. */ |
823 | return; |
824 | |
825 | parport_set_timeout(dev, inactivity: 0); |
826 | |
827 | /* Go to compatibility mode. */ |
828 | parport_negotiate(port, IEEE1284_MODE_COMPAT); |
829 | |
830 | do { |
831 | /* Write the data, converting LF->CRLF as we go. */ |
832 | ssize_t canwrite = count; |
833 | char *lf = memchr(p: s, c: '\n', size: count); |
834 | if (lf) |
835 | canwrite = lf - s; |
836 | |
837 | if (canwrite > 0) { |
838 | written = parport_write(port, buf: s, len: canwrite); |
839 | |
840 | if (written <= 0) |
841 | continue; |
842 | |
843 | s += written; |
844 | count -= written; |
845 | canwrite -= written; |
846 | } |
847 | |
848 | if (lf && canwrite <= 0) { |
849 | const char *crlf = "\r\n" ; |
850 | int i = 2; |
851 | |
852 | /* Dodge the original '\n', and put '\r\n' instead. */ |
853 | s++; |
854 | count--; |
855 | do { |
856 | written = parport_write(port, buf: crlf, len: i); |
857 | if (written > 0) { |
858 | i -= written; |
859 | crlf += written; |
860 | } |
861 | } while (i > 0 && (CONSOLE_LP_STRICT || written > 0)); |
862 | } |
863 | } while (count > 0 && (CONSOLE_LP_STRICT || written > 0)); |
864 | |
865 | parport_release(dev); |
866 | } |
867 | |
868 | static struct console lpcons = { |
869 | .name = "lp" , |
870 | .write = lp_console_write, |
871 | .flags = CON_PRINTBUFFER, |
872 | }; |
873 | |
874 | #endif /* console on line printer */ |
875 | |
876 | /* --- initialisation code ------------------------------------- */ |
877 | |
878 | static int parport_nr[LP_NO] = { [0 ... LP_NO-1] = LP_PARPORT_UNSPEC }; |
879 | static char *parport[LP_NO]; |
880 | static bool reset; |
881 | |
882 | module_param_array(parport, charp, NULL, 0); |
883 | module_param(reset, bool, 0); |
884 | |
885 | #ifndef MODULE |
886 | static int __init lp_setup(char *str) |
887 | { |
888 | static int parport_ptr; |
889 | int x; |
890 | |
891 | if (get_option(str: &str, pint: &x)) { |
892 | if (x == 0) { |
893 | /* disable driver on "lp=" or "lp=0" */ |
894 | parport_nr[0] = LP_PARPORT_OFF; |
895 | } else { |
896 | printk(KERN_WARNING "warning: 'lp=0x%x' is deprecated, ignored\n" , x); |
897 | return 0; |
898 | } |
899 | } else if (!strncmp(str, "parport" , 7)) { |
900 | int n = simple_strtoul(str+7, NULL, 10); |
901 | if (parport_ptr < LP_NO) |
902 | parport_nr[parport_ptr++] = n; |
903 | else |
904 | printk(KERN_INFO "lp: too many ports, %s ignored.\n" , |
905 | str); |
906 | } else if (!strcmp(str, "auto" )) { |
907 | parport_nr[0] = LP_PARPORT_AUTO; |
908 | } else if (!strcmp(str, "none" )) { |
909 | if (parport_ptr < LP_NO) |
910 | parport_nr[parport_ptr++] = LP_PARPORT_NONE; |
911 | else |
912 | printk(KERN_INFO "lp: too many ports, %s ignored.\n" , |
913 | str); |
914 | } else if (!strcmp(str, "reset" )) { |
915 | reset = true; |
916 | } |
917 | return 1; |
918 | } |
919 | #endif |
920 | |
921 | static int lp_register(int nr, struct parport *port) |
922 | { |
923 | struct pardev_cb ppdev_cb; |
924 | |
925 | memset(&ppdev_cb, 0, sizeof(ppdev_cb)); |
926 | ppdev_cb.preempt = lp_preempt; |
927 | ppdev_cb.private = &lp_table[nr]; |
928 | lp_table[nr].dev = parport_register_dev_model(port, name: "lp" , |
929 | par_dev_cb: &ppdev_cb, cnt: nr); |
930 | if (lp_table[nr].dev == NULL) |
931 | return 1; |
932 | lp_table[nr].flags |= LP_EXIST; |
933 | |
934 | if (reset) |
935 | lp_reset(minor: nr); |
936 | |
937 | device_create(cls: &lp_class, parent: port->dev, MKDEV(LP_MAJOR, nr), NULL, |
938 | fmt: "lp%d" , nr); |
939 | |
940 | printk(KERN_INFO "lp%d: using %s (%s).\n" , nr, port->name, |
941 | (port->irq == PARPORT_IRQ_NONE)?"polling" :"interrupt-driven" ); |
942 | |
943 | #ifdef CONFIG_LP_CONSOLE |
944 | if (!nr) { |
945 | if (port->modes & PARPORT_MODE_SAFEININT) { |
946 | register_console(&lpcons); |
947 | console_registered = port; |
948 | printk(KERN_INFO "lp%d: console ready\n" , CONSOLE_LP); |
949 | } else |
950 | printk(KERN_ERR "lp%d: cannot run console on %s\n" , |
951 | CONSOLE_LP, port->name); |
952 | } |
953 | #endif |
954 | port_num[nr] = port->number; |
955 | |
956 | return 0; |
957 | } |
958 | |
959 | static void lp_attach(struct parport *port) |
960 | { |
961 | unsigned int i; |
962 | |
963 | switch (parport_nr[0]) { |
964 | case LP_PARPORT_UNSPEC: |
965 | case LP_PARPORT_AUTO: |
966 | if (parport_nr[0] == LP_PARPORT_AUTO && |
967 | port->probe_info[0].class != PARPORT_CLASS_PRINTER) |
968 | return; |
969 | if (lp_count == LP_NO) { |
970 | printk(KERN_INFO "lp: ignoring parallel port (max. %d)\n" ,LP_NO); |
971 | return; |
972 | } |
973 | for (i = 0; i < LP_NO; i++) |
974 | if (port_num[i] == -1) |
975 | break; |
976 | |
977 | if (!lp_register(nr: i, port)) |
978 | lp_count++; |
979 | break; |
980 | |
981 | default: |
982 | for (i = 0; i < LP_NO; i++) { |
983 | if (port->number == parport_nr[i]) { |
984 | if (!lp_register(nr: i, port)) |
985 | lp_count++; |
986 | break; |
987 | } |
988 | } |
989 | break; |
990 | } |
991 | } |
992 | |
993 | static void lp_detach(struct parport *port) |
994 | { |
995 | int n; |
996 | |
997 | /* Write this some day. */ |
998 | #ifdef CONFIG_LP_CONSOLE |
999 | if (console_registered == port) { |
1000 | unregister_console(&lpcons); |
1001 | console_registered = NULL; |
1002 | } |
1003 | #endif /* CONFIG_LP_CONSOLE */ |
1004 | |
1005 | for (n = 0; n < LP_NO; n++) { |
1006 | if (port_num[n] == port->number) { |
1007 | port_num[n] = -1; |
1008 | lp_count--; |
1009 | device_destroy(cls: &lp_class, MKDEV(LP_MAJOR, n)); |
1010 | parport_unregister_device(dev: lp_table[n].dev); |
1011 | } |
1012 | } |
1013 | } |
1014 | |
1015 | static struct parport_driver lp_driver = { |
1016 | .name = "lp" , |
1017 | .match_port = lp_attach, |
1018 | .detach = lp_detach, |
1019 | .devmodel = true, |
1020 | }; |
1021 | |
1022 | static int __init lp_init(void) |
1023 | { |
1024 | int i, err; |
1025 | |
1026 | if (parport_nr[0] == LP_PARPORT_OFF) |
1027 | return 0; |
1028 | |
1029 | for (i = 0; i < LP_NO; i++) { |
1030 | lp_table[i].dev = NULL; |
1031 | lp_table[i].flags = 0; |
1032 | lp_table[i].chars = LP_INIT_CHAR; |
1033 | lp_table[i].time = LP_INIT_TIME; |
1034 | lp_table[i].wait = LP_INIT_WAIT; |
1035 | lp_table[i].lp_buffer = NULL; |
1036 | #ifdef LP_STATS |
1037 | lp_table[i].lastcall = 0; |
1038 | lp_table[i].runchars = 0; |
1039 | memset(&lp_table[i].stats, 0, sizeof(struct lp_stats)); |
1040 | #endif |
1041 | lp_table[i].last_error = 0; |
1042 | init_waitqueue_head(&lp_table[i].waitq); |
1043 | init_waitqueue_head(&lp_table[i].dataq); |
1044 | mutex_init(&lp_table[i].port_mutex); |
1045 | lp_table[i].timeout = 10 * HZ; |
1046 | port_num[i] = -1; |
1047 | } |
1048 | |
1049 | if (register_chrdev(LP_MAJOR, name: "lp" , fops: &lp_fops)) { |
1050 | printk(KERN_ERR "lp: unable to get major %d\n" , LP_MAJOR); |
1051 | return -EIO; |
1052 | } |
1053 | |
1054 | err = class_register(class: &lp_class); |
1055 | if (err) |
1056 | goto out_reg; |
1057 | |
1058 | if (parport_register_driver(&lp_driver)) { |
1059 | printk(KERN_ERR "lp: unable to register with parport\n" ); |
1060 | err = -EIO; |
1061 | goto out_class; |
1062 | } |
1063 | |
1064 | if (!lp_count) { |
1065 | printk(KERN_INFO "lp: driver loaded but no devices found\n" ); |
1066 | #ifndef CONFIG_PARPORT_1284 |
1067 | if (parport_nr[0] == LP_PARPORT_AUTO) |
1068 | printk(KERN_INFO "lp: (is IEEE 1284 support enabled?)\n" ); |
1069 | #endif |
1070 | } |
1071 | |
1072 | return 0; |
1073 | |
1074 | out_class: |
1075 | class_unregister(class: &lp_class); |
1076 | out_reg: |
1077 | unregister_chrdev(LP_MAJOR, name: "lp" ); |
1078 | return err; |
1079 | } |
1080 | |
1081 | static int __init lp_init_module(void) |
1082 | { |
1083 | if (parport[0]) { |
1084 | /* The user gave some parameters. Let's see what they were. */ |
1085 | if (!strncmp(parport[0], "auto" , 4)) |
1086 | parport_nr[0] = LP_PARPORT_AUTO; |
1087 | else { |
1088 | int n; |
1089 | for (n = 0; n < LP_NO && parport[n]; n++) { |
1090 | if (!strncmp(parport[n], "none" , 4)) |
1091 | parport_nr[n] = LP_PARPORT_NONE; |
1092 | else { |
1093 | char *ep; |
1094 | unsigned long r = simple_strtoul(parport[n], &ep, 0); |
1095 | if (ep != parport[n]) |
1096 | parport_nr[n] = r; |
1097 | else { |
1098 | printk(KERN_ERR "lp: bad port specifier `%s'\n" , parport[n]); |
1099 | return -ENODEV; |
1100 | } |
1101 | } |
1102 | } |
1103 | } |
1104 | } |
1105 | |
1106 | return lp_init(); |
1107 | } |
1108 | |
1109 | static void lp_cleanup_module(void) |
1110 | { |
1111 | parport_unregister_driver(&lp_driver); |
1112 | |
1113 | #ifdef CONFIG_LP_CONSOLE |
1114 | unregister_console(&lpcons); |
1115 | #endif |
1116 | |
1117 | unregister_chrdev(LP_MAJOR, name: "lp" ); |
1118 | class_unregister(class: &lp_class); |
1119 | } |
1120 | |
1121 | __setup("lp=" , lp_setup); |
1122 | module_init(lp_init_module); |
1123 | module_exit(lp_cleanup_module); |
1124 | |
1125 | MODULE_ALIAS_CHARDEV_MAJOR(LP_MAJOR); |
1126 | MODULE_LICENSE("GPL" ); |
1127 | |