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Commit | Line | Data |
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1da177e4 LT |
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 | ||
132 | #include <linux/parport.h> | |
133 | #undef LP_STATS | |
134 | #include <linux/lp.h> | |
135 | ||
136 | #include <asm/irq.h> | |
137 | #include <asm/uaccess.h> | |
138 | #include <asm/system.h> | |
139 | ||
140 | /* if you have more than 8 printers, remember to increase LP_NO */ | |
141 | #define LP_NO 8 | |
142 | ||
143 | /* ROUND_UP macro from fs/select.c */ | |
144 | #define ROUND_UP(x,y) (((x)+(y)-1)/(y)) | |
145 | ||
146 | static struct lp_struct lp_table[LP_NO]; | |
147 | ||
148 | static unsigned int lp_count = 0; | |
ca8eca68 | 149 | static struct class *lp_class; |
1da177e4 LT |
150 | |
151 | #ifdef CONFIG_LP_CONSOLE | |
152 | static struct parport *console_registered; // initially NULL | |
153 | #endif /* CONFIG_LP_CONSOLE */ | |
154 | ||
155 | #undef LP_DEBUG | |
156 | ||
157 | /* Bits used to manage claiming the parport device */ | |
158 | #define LP_PREEMPT_REQUEST 1 | |
159 | #define LP_PARPORT_CLAIMED 2 | |
160 | ||
161 | /* --- low-level port access ----------------------------------- */ | |
162 | ||
163 | #define r_dtr(x) (parport_read_data(lp_table[(x)].dev->port)) | |
164 | #define r_str(x) (parport_read_status(lp_table[(x)].dev->port)) | |
165 | #define w_ctr(x,y) do { parport_write_control(lp_table[(x)].dev->port, (y)); } while (0) | |
166 | #define w_dtr(x,y) do { parport_write_data(lp_table[(x)].dev->port, (y)); } while (0) | |
167 | ||
168 | /* Claim the parport or block trying unless we've already claimed it */ | |
169 | static void lp_claim_parport_or_block(struct lp_struct *this_lp) | |
170 | { | |
171 | if (!test_and_set_bit(LP_PARPORT_CLAIMED, &this_lp->bits)) { | |
172 | parport_claim_or_block (this_lp->dev); | |
173 | } | |
174 | } | |
175 | ||
176 | /* Claim the parport or block trying unless we've already claimed it */ | |
177 | static void lp_release_parport(struct lp_struct *this_lp) | |
178 | { | |
179 | if (test_and_clear_bit(LP_PARPORT_CLAIMED, &this_lp->bits)) { | |
180 | parport_release (this_lp->dev); | |
181 | } | |
182 | } | |
183 | ||
184 | ||
185 | ||
186 | static int lp_preempt(void *handle) | |
187 | { | |
188 | struct lp_struct *this_lp = (struct lp_struct *)handle; | |
189 | set_bit(LP_PREEMPT_REQUEST, &this_lp->bits); | |
190 | return (1); | |
191 | } | |
192 | ||
193 | ||
194 | /* | |
195 | * Try to negotiate to a new mode; if unsuccessful negotiate to | |
196 | * compatibility mode. Return the mode we ended up in. | |
197 | */ | |
198 | static int lp_negotiate(struct parport * port, int mode) | |
199 | { | |
200 | if (parport_negotiate (port, mode) != 0) { | |
201 | mode = IEEE1284_MODE_COMPAT; | |
202 | parport_negotiate (port, mode); | |
203 | } | |
204 | ||
205 | return (mode); | |
206 | } | |
207 | ||
208 | static int lp_reset(int minor) | |
209 | { | |
210 | int retval; | |
211 | lp_claim_parport_or_block (&lp_table[minor]); | |
212 | w_ctr(minor, LP_PSELECP); | |
213 | udelay (LP_DELAY); | |
214 | w_ctr(minor, LP_PSELECP | LP_PINITP); | |
215 | retval = r_str(minor); | |
216 | lp_release_parport (&lp_table[minor]); | |
217 | return retval; | |
218 | } | |
219 | ||
220 | static void lp_error (int minor) | |
221 | { | |
222 | DEFINE_WAIT(wait); | |
223 | int polling; | |
224 | ||
225 | if (LP_F(minor) & LP_ABORT) | |
226 | return; | |
227 | ||
228 | polling = lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE; | |
229 | if (polling) lp_release_parport (&lp_table[minor]); | |
230 | prepare_to_wait(&lp_table[minor].waitq, &wait, TASK_INTERRUPTIBLE); | |
231 | schedule_timeout(LP_TIMEOUT_POLLED); | |
232 | finish_wait(&lp_table[minor].waitq, &wait); | |
233 | if (polling) lp_claim_parport_or_block (&lp_table[minor]); | |
234 | else parport_yield_blocking (lp_table[minor].dev); | |
235 | } | |
236 | ||
237 | static int lp_check_status(int minor) | |
238 | { | |
239 | int error = 0; | |
240 | unsigned int last = lp_table[minor].last_error; | |
241 | unsigned char status = r_str(minor); | |
242 | if ((status & LP_PERRORP) && !(LP_F(minor) & LP_CAREFUL)) | |
243 | /* No error. */ | |
244 | last = 0; | |
245 | else if ((status & LP_POUTPA)) { | |
246 | if (last != LP_POUTPA) { | |
247 | last = LP_POUTPA; | |
248 | printk(KERN_INFO "lp%d out of paper\n", minor); | |
249 | } | |
250 | error = -ENOSPC; | |
251 | } else if (!(status & LP_PSELECD)) { | |
252 | if (last != LP_PSELECD) { | |
253 | last = LP_PSELECD; | |
254 | printk(KERN_INFO "lp%d off-line\n", minor); | |
255 | } | |
256 | error = -EIO; | |
257 | } else if (!(status & LP_PERRORP)) { | |
258 | if (last != LP_PERRORP) { | |
259 | last = LP_PERRORP; | |
260 | printk(KERN_INFO "lp%d on fire\n", minor); | |
261 | } | |
262 | error = -EIO; | |
263 | } else { | |
264 | last = 0; /* Come here if LP_CAREFUL is set and no | |
265 | errors are reported. */ | |
266 | } | |
267 | ||
268 | lp_table[minor].last_error = last; | |
269 | ||
270 | if (last != 0) | |
271 | lp_error(minor); | |
272 | ||
273 | return error; | |
274 | } | |
275 | ||
276 | static int lp_wait_ready(int minor, int nonblock) | |
277 | { | |
278 | int error = 0; | |
279 | ||
280 | /* If we're not in compatibility mode, we're ready now! */ | |
281 | if (lp_table[minor].current_mode != IEEE1284_MODE_COMPAT) { | |
282 | return (0); | |
283 | } | |
284 | ||
285 | do { | |
286 | error = lp_check_status (minor); | |
287 | if (error && (nonblock || (LP_F(minor) & LP_ABORT))) | |
288 | break; | |
289 | if (signal_pending (current)) { | |
290 | error = -EINTR; | |
291 | break; | |
292 | } | |
293 | } while (error); | |
294 | return error; | |
295 | } | |
296 | ||
297 | static ssize_t lp_write(struct file * file, const char __user * buf, | |
298 | size_t count, loff_t *ppos) | |
299 | { | |
300 | unsigned int minor = iminor(file->f_dentry->d_inode); | |
301 | struct parport *port = lp_table[minor].dev->port; | |
302 | char *kbuf = lp_table[minor].lp_buffer; | |
303 | ssize_t retv = 0; | |
304 | ssize_t written; | |
305 | size_t copy_size = count; | |
306 | int nonblock = ((file->f_flags & O_NONBLOCK) || | |
307 | (LP_F(minor) & LP_ABORT)); | |
308 | ||
309 | #ifdef LP_STATS | |
310 | if (jiffies-lp_table[minor].lastcall > LP_TIME(minor)) | |
311 | lp_table[minor].runchars = 0; | |
312 | ||
313 | lp_table[minor].lastcall = jiffies; | |
314 | #endif | |
315 | ||
316 | /* Need to copy the data from user-space. */ | |
317 | if (copy_size > LP_BUFFER_SIZE) | |
318 | copy_size = LP_BUFFER_SIZE; | |
319 | ||
320 | if (down_interruptible (&lp_table[minor].port_mutex)) | |
321 | return -EINTR; | |
322 | ||
323 | if (copy_from_user (kbuf, buf, copy_size)) { | |
324 | retv = -EFAULT; | |
325 | goto out_unlock; | |
326 | } | |
327 | ||
328 | /* Claim Parport or sleep until it becomes available | |
329 | */ | |
330 | lp_claim_parport_or_block (&lp_table[minor]); | |
331 | /* Go to the proper mode. */ | |
332 | lp_table[minor].current_mode = lp_negotiate (port, | |
333 | lp_table[minor].best_mode); | |
334 | ||
335 | parport_set_timeout (lp_table[minor].dev, | |
336 | (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK | |
337 | : lp_table[minor].timeout)); | |
338 | ||
339 | if ((retv = lp_wait_ready (minor, nonblock)) == 0) | |
340 | do { | |
341 | /* Write the data. */ | |
342 | written = parport_write (port, kbuf, copy_size); | |
343 | if (written > 0) { | |
344 | copy_size -= written; | |
345 | count -= written; | |
346 | buf += written; | |
347 | retv += written; | |
348 | } | |
349 | ||
350 | if (signal_pending (current)) { | |
351 | if (retv == 0) | |
352 | retv = -EINTR; | |
353 | ||
354 | break; | |
355 | } | |
356 | ||
357 | if (copy_size > 0) { | |
358 | /* incomplete write -> check error ! */ | |
359 | int error; | |
360 | ||
361 | parport_negotiate (lp_table[minor].dev->port, | |
362 | IEEE1284_MODE_COMPAT); | |
363 | lp_table[minor].current_mode = IEEE1284_MODE_COMPAT; | |
364 | ||
365 | error = lp_wait_ready (minor, nonblock); | |
366 | ||
367 | if (error) { | |
368 | if (retv == 0) | |
369 | retv = error; | |
370 | break; | |
371 | } else if (nonblock) { | |
372 | if (retv == 0) | |
373 | retv = -EAGAIN; | |
374 | break; | |
375 | } | |
376 | ||
377 | parport_yield_blocking (lp_table[minor].dev); | |
378 | lp_table[minor].current_mode | |
379 | = lp_negotiate (port, | |
380 | lp_table[minor].best_mode); | |
381 | ||
382 | } else if (need_resched()) | |
383 | schedule (); | |
384 | ||
385 | if (count) { | |
386 | copy_size = count; | |
387 | if (copy_size > LP_BUFFER_SIZE) | |
388 | copy_size = LP_BUFFER_SIZE; | |
389 | ||
390 | if (copy_from_user(kbuf, buf, copy_size)) { | |
391 | if (retv == 0) | |
392 | retv = -EFAULT; | |
393 | break; | |
394 | } | |
395 | } | |
396 | } while (count > 0); | |
397 | ||
398 | if (test_and_clear_bit(LP_PREEMPT_REQUEST, | |
399 | &lp_table[minor].bits)) { | |
400 | printk(KERN_INFO "lp%d releasing parport\n", minor); | |
401 | parport_negotiate (lp_table[minor].dev->port, | |
402 | IEEE1284_MODE_COMPAT); | |
403 | lp_table[minor].current_mode = IEEE1284_MODE_COMPAT; | |
404 | lp_release_parport (&lp_table[minor]); | |
405 | } | |
406 | out_unlock: | |
407 | up (&lp_table[minor].port_mutex); | |
408 | ||
409 | return retv; | |
410 | } | |
411 | ||
412 | #ifdef CONFIG_PARPORT_1284 | |
413 | ||
414 | /* Status readback conforming to ieee1284 */ | |
415 | static ssize_t lp_read(struct file * file, char __user * buf, | |
416 | size_t count, loff_t *ppos) | |
417 | { | |
418 | DEFINE_WAIT(wait); | |
419 | unsigned int minor=iminor(file->f_dentry->d_inode); | |
420 | struct parport *port = lp_table[minor].dev->port; | |
421 | ssize_t retval = 0; | |
422 | char *kbuf = lp_table[minor].lp_buffer; | |
423 | int nonblock = ((file->f_flags & O_NONBLOCK) || | |
424 | (LP_F(minor) & LP_ABORT)); | |
425 | ||
426 | if (count > LP_BUFFER_SIZE) | |
427 | count = LP_BUFFER_SIZE; | |
428 | ||
429 | if (down_interruptible (&lp_table[minor].port_mutex)) | |
430 | return -EINTR; | |
431 | ||
432 | lp_claim_parport_or_block (&lp_table[minor]); | |
433 | ||
434 | parport_set_timeout (lp_table[minor].dev, | |
435 | (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK | |
436 | : lp_table[minor].timeout)); | |
437 | ||
438 | parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT); | |
439 | if (parport_negotiate (lp_table[minor].dev->port, | |
440 | IEEE1284_MODE_NIBBLE)) { | |
441 | retval = -EIO; | |
442 | goto out; | |
443 | } | |
444 | ||
445 | while (retval == 0) { | |
446 | retval = parport_read (port, kbuf, count); | |
447 | ||
448 | if (retval > 0) | |
449 | break; | |
450 | ||
451 | if (nonblock) { | |
452 | retval = -EAGAIN; | |
453 | break; | |
454 | } | |
455 | ||
456 | /* Wait for data. */ | |
457 | ||
458 | if (lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE) { | |
459 | parport_negotiate (lp_table[minor].dev->port, | |
460 | IEEE1284_MODE_COMPAT); | |
461 | lp_error (minor); | |
462 | if (parport_negotiate (lp_table[minor].dev->port, | |
463 | IEEE1284_MODE_NIBBLE)) { | |
464 | retval = -EIO; | |
465 | goto out; | |
466 | } | |
467 | } else { | |
468 | prepare_to_wait(&lp_table[minor].waitq, &wait, TASK_INTERRUPTIBLE); | |
469 | schedule_timeout(LP_TIMEOUT_POLLED); | |
470 | finish_wait(&lp_table[minor].waitq, &wait); | |
471 | } | |
472 | ||
473 | if (signal_pending (current)) { | |
474 | retval = -ERESTARTSYS; | |
475 | break; | |
476 | } | |
477 | ||
478 | cond_resched (); | |
479 | } | |
480 | parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT); | |
481 | out: | |
482 | lp_release_parport (&lp_table[minor]); | |
483 | ||
484 | if (retval > 0 && copy_to_user (buf, kbuf, retval)) | |
485 | retval = -EFAULT; | |
486 | ||
487 | up (&lp_table[minor].port_mutex); | |
488 | ||
489 | return retval; | |
490 | } | |
491 | ||
492 | #endif /* IEEE 1284 support */ | |
493 | ||
494 | static int lp_open(struct inode * inode, struct file * file) | |
495 | { | |
496 | unsigned int minor = iminor(inode); | |
497 | ||
498 | if (minor >= LP_NO) | |
499 | return -ENXIO; | |
500 | if ((LP_F(minor) & LP_EXIST) == 0) | |
501 | return -ENXIO; | |
502 | if (test_and_set_bit(LP_BUSY_BIT_POS, &LP_F(minor))) | |
503 | return -EBUSY; | |
504 | ||
505 | /* If ABORTOPEN is set and the printer is offline or out of paper, | |
506 | we may still want to open it to perform ioctl()s. Therefore we | |
507 | have commandeered O_NONBLOCK, even though it is being used in | |
508 | a non-standard manner. This is strictly a Linux hack, and | |
509 | should most likely only ever be used by the tunelp application. */ | |
510 | if ((LP_F(minor) & LP_ABORTOPEN) && !(file->f_flags & O_NONBLOCK)) { | |
511 | int status; | |
512 | lp_claim_parport_or_block (&lp_table[minor]); | |
513 | status = r_str(minor); | |
514 | lp_release_parport (&lp_table[minor]); | |
515 | if (status & LP_POUTPA) { | |
516 | printk(KERN_INFO "lp%d out of paper\n", minor); | |
517 | LP_F(minor) &= ~LP_BUSY; | |
518 | return -ENOSPC; | |
519 | } else if (!(status & LP_PSELECD)) { | |
520 | printk(KERN_INFO "lp%d off-line\n", minor); | |
521 | LP_F(minor) &= ~LP_BUSY; | |
522 | return -EIO; | |
523 | } else if (!(status & LP_PERRORP)) { | |
524 | printk(KERN_ERR "lp%d printer error\n", minor); | |
525 | LP_F(minor) &= ~LP_BUSY; | |
526 | return -EIO; | |
527 | } | |
528 | } | |
529 | lp_table[minor].lp_buffer = (char *) kmalloc(LP_BUFFER_SIZE, GFP_KERNEL); | |
530 | if (!lp_table[minor].lp_buffer) { | |
531 | LP_F(minor) &= ~LP_BUSY; | |
532 | return -ENOMEM; | |
533 | } | |
534 | /* Determine if the peripheral supports ECP mode */ | |
535 | lp_claim_parport_or_block (&lp_table[minor]); | |
536 | if ( (lp_table[minor].dev->port->modes & PARPORT_MODE_ECP) && | |
537 | !parport_negotiate (lp_table[minor].dev->port, | |
538 | IEEE1284_MODE_ECP)) { | |
539 | printk (KERN_INFO "lp%d: ECP mode\n", minor); | |
540 | lp_table[minor].best_mode = IEEE1284_MODE_ECP; | |
541 | } else { | |
542 | lp_table[minor].best_mode = IEEE1284_MODE_COMPAT; | |
543 | } | |
544 | /* Leave peripheral in compatibility mode */ | |
545 | parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT); | |
546 | lp_release_parport (&lp_table[minor]); | |
547 | lp_table[minor].current_mode = IEEE1284_MODE_COMPAT; | |
548 | return 0; | |
549 | } | |
550 | ||
551 | static int lp_release(struct inode * inode, struct file * file) | |
552 | { | |
553 | unsigned int minor = iminor(inode); | |
554 | ||
555 | lp_claim_parport_or_block (&lp_table[minor]); | |
556 | parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT); | |
557 | lp_table[minor].current_mode = IEEE1284_MODE_COMPAT; | |
558 | lp_release_parport (&lp_table[minor]); | |
559 | kfree(lp_table[minor].lp_buffer); | |
560 | lp_table[minor].lp_buffer = NULL; | |
561 | LP_F(minor) &= ~LP_BUSY; | |
562 | return 0; | |
563 | } | |
564 | ||
565 | static int lp_ioctl(struct inode *inode, struct file *file, | |
566 | unsigned int cmd, unsigned long arg) | |
567 | { | |
568 | unsigned int minor = iminor(inode); | |
569 | int status; | |
570 | int retval = 0; | |
571 | void __user *argp = (void __user *)arg; | |
572 | ||
573 | #ifdef LP_DEBUG | |
574 | printk(KERN_DEBUG "lp%d ioctl, cmd: 0x%x, arg: 0x%lx\n", minor, cmd, arg); | |
575 | #endif | |
576 | if (minor >= LP_NO) | |
577 | return -ENODEV; | |
578 | if ((LP_F(minor) & LP_EXIST) == 0) | |
579 | return -ENODEV; | |
580 | switch ( cmd ) { | |
581 | struct timeval par_timeout; | |
582 | long to_jiffies; | |
583 | ||
584 | case LPTIME: | |
585 | LP_TIME(minor) = arg * HZ/100; | |
586 | break; | |
587 | case LPCHAR: | |
588 | LP_CHAR(minor) = arg; | |
589 | break; | |
590 | case LPABORT: | |
591 | if (arg) | |
592 | LP_F(minor) |= LP_ABORT; | |
593 | else | |
594 | LP_F(minor) &= ~LP_ABORT; | |
595 | break; | |
596 | case LPABORTOPEN: | |
597 | if (arg) | |
598 | LP_F(minor) |= LP_ABORTOPEN; | |
599 | else | |
600 | LP_F(minor) &= ~LP_ABORTOPEN; | |
601 | break; | |
602 | case LPCAREFUL: | |
603 | if (arg) | |
604 | LP_F(minor) |= LP_CAREFUL; | |
605 | else | |
606 | LP_F(minor) &= ~LP_CAREFUL; | |
607 | break; | |
608 | case LPWAIT: | |
609 | LP_WAIT(minor) = arg; | |
610 | break; | |
611 | case LPSETIRQ: | |
612 | return -EINVAL; | |
613 | break; | |
614 | case LPGETIRQ: | |
615 | if (copy_to_user(argp, &LP_IRQ(minor), | |
616 | sizeof(int))) | |
617 | return -EFAULT; | |
618 | break; | |
619 | case LPGETSTATUS: | |
620 | lp_claim_parport_or_block (&lp_table[minor]); | |
621 | status = r_str(minor); | |
622 | lp_release_parport (&lp_table[minor]); | |
623 | ||
624 | if (copy_to_user(argp, &status, sizeof(int))) | |
625 | return -EFAULT; | |
626 | break; | |
627 | case LPRESET: | |
628 | lp_reset(minor); | |
629 | break; | |
630 | #ifdef LP_STATS | |
631 | case LPGETSTATS: | |
632 | if (copy_to_user(argp, &LP_STAT(minor), | |
633 | sizeof(struct lp_stats))) | |
634 | return -EFAULT; | |
635 | if (capable(CAP_SYS_ADMIN)) | |
636 | memset(&LP_STAT(minor), 0, | |
637 | sizeof(struct lp_stats)); | |
638 | break; | |
639 | #endif | |
640 | case LPGETFLAGS: | |
641 | status = LP_F(minor); | |
642 | if (copy_to_user(argp, &status, sizeof(int))) | |
643 | return -EFAULT; | |
644 | break; | |
645 | ||
646 | case LPSETTIMEOUT: | |
647 | if (copy_from_user (&par_timeout, argp, | |
648 | sizeof (struct timeval))) { | |
649 | return -EFAULT; | |
650 | } | |
651 | /* Convert to jiffies, place in lp_table */ | |
652 | if ((par_timeout.tv_sec < 0) || | |
653 | (par_timeout.tv_usec < 0)) { | |
654 | return -EINVAL; | |
655 | } | |
656 | to_jiffies = ROUND_UP(par_timeout.tv_usec, 1000000/HZ); | |
657 | to_jiffies += par_timeout.tv_sec * (long) HZ; | |
658 | if (to_jiffies <= 0) { | |
659 | return -EINVAL; | |
660 | } | |
661 | lp_table[minor].timeout = to_jiffies; | |
662 | break; | |
663 | ||
664 | default: | |
665 | retval = -EINVAL; | |
666 | } | |
667 | return retval; | |
668 | } | |
669 | ||
670 | static struct file_operations lp_fops = { | |
671 | .owner = THIS_MODULE, | |
672 | .write = lp_write, | |
673 | .ioctl = lp_ioctl, | |
674 | .open = lp_open, | |
675 | .release = lp_release, | |
676 | #ifdef CONFIG_PARPORT_1284 | |
677 | .read = lp_read, | |
678 | #endif | |
679 | }; | |
680 | ||
681 | /* --- support for console on the line printer ----------------- */ | |
682 | ||
683 | #ifdef CONFIG_LP_CONSOLE | |
684 | ||
685 | #define CONSOLE_LP 0 | |
686 | ||
687 | /* If the printer is out of paper, we can either lose the messages or | |
688 | * stall until the printer is happy again. Define CONSOLE_LP_STRICT | |
689 | * non-zero to get the latter behaviour. */ | |
690 | #define CONSOLE_LP_STRICT 1 | |
691 | ||
692 | /* The console must be locked when we get here. */ | |
693 | ||
694 | static void lp_console_write (struct console *co, const char *s, | |
695 | unsigned count) | |
696 | { | |
697 | struct pardevice *dev = lp_table[CONSOLE_LP].dev; | |
698 | struct parport *port = dev->port; | |
699 | ssize_t written; | |
700 | ||
701 | if (parport_claim (dev)) | |
702 | /* Nothing we can do. */ | |
703 | return; | |
704 | ||
705 | parport_set_timeout (dev, 0); | |
706 | ||
707 | /* Go to compatibility mode. */ | |
708 | parport_negotiate (port, IEEE1284_MODE_COMPAT); | |
709 | ||
710 | do { | |
711 | /* Write the data, converting LF->CRLF as we go. */ | |
712 | ssize_t canwrite = count; | |
713 | char *lf = memchr (s, '\n', count); | |
714 | if (lf) | |
715 | canwrite = lf - s; | |
716 | ||
717 | if (canwrite > 0) { | |
718 | written = parport_write (port, s, canwrite); | |
719 | ||
720 | if (written <= 0) | |
721 | continue; | |
722 | ||
723 | s += written; | |
724 | count -= written; | |
725 | canwrite -= written; | |
726 | } | |
727 | ||
728 | if (lf && canwrite <= 0) { | |
729 | const char *crlf = "\r\n"; | |
730 | int i = 2; | |
731 | ||
732 | /* Dodge the original '\n', and put '\r\n' instead. */ | |
733 | s++; | |
734 | count--; | |
735 | do { | |
736 | written = parport_write (port, crlf, i); | |
737 | if (written > 0) | |
738 | i -= written, crlf += written; | |
739 | } while (i > 0 && (CONSOLE_LP_STRICT || written > 0)); | |
740 | } | |
741 | } while (count > 0 && (CONSOLE_LP_STRICT || written > 0)); | |
742 | ||
743 | parport_release (dev); | |
744 | } | |
745 | ||
746 | static struct console lpcons = { | |
747 | .name = "lp", | |
748 | .write = lp_console_write, | |
749 | .flags = CON_PRINTBUFFER, | |
750 | }; | |
751 | ||
752 | #endif /* console on line printer */ | |
753 | ||
754 | /* --- initialisation code ------------------------------------- */ | |
755 | ||
756 | static int parport_nr[LP_NO] = { [0 ... LP_NO-1] = LP_PARPORT_UNSPEC }; | |
757 | static char *parport[LP_NO] = { NULL, }; | |
758 | static int reset = 0; | |
759 | ||
760 | module_param_array(parport, charp, NULL, 0); | |
761 | module_param(reset, bool, 0); | |
762 | ||
763 | #ifndef MODULE | |
764 | static int __init lp_setup (char *str) | |
765 | { | |
766 | static int parport_ptr; // initially zero | |
767 | int x; | |
768 | ||
769 | if (get_option (&str, &x)) { | |
770 | if (x == 0) { | |
771 | /* disable driver on "lp=" or "lp=0" */ | |
772 | parport_nr[0] = LP_PARPORT_OFF; | |
773 | } else { | |
774 | printk(KERN_WARNING "warning: 'lp=0x%x' is deprecated, ignored\n", x); | |
775 | return 0; | |
776 | } | |
777 | } else if (!strncmp(str, "parport", 7)) { | |
778 | int n = simple_strtoul(str+7, NULL, 10); | |
779 | if (parport_ptr < LP_NO) | |
780 | parport_nr[parport_ptr++] = n; | |
781 | else | |
782 | printk(KERN_INFO "lp: too many ports, %s ignored.\n", | |
783 | str); | |
784 | } else if (!strcmp(str, "auto")) { | |
785 | parport_nr[0] = LP_PARPORT_AUTO; | |
786 | } else if (!strcmp(str, "none")) { | |
787 | parport_nr[parport_ptr++] = LP_PARPORT_NONE; | |
788 | } else if (!strcmp(str, "reset")) { | |
789 | reset = 1; | |
790 | } | |
791 | return 1; | |
792 | } | |
793 | #endif | |
794 | ||
795 | static int lp_register(int nr, struct parport *port) | |
796 | { | |
797 | lp_table[nr].dev = parport_register_device(port, "lp", | |
798 | lp_preempt, NULL, NULL, 0, | |
799 | (void *) &lp_table[nr]); | |
800 | if (lp_table[nr].dev == NULL) | |
801 | return 1; | |
802 | lp_table[nr].flags |= LP_EXIST; | |
803 | ||
804 | if (reset) | |
805 | lp_reset(nr); | |
806 | ||
ca8eca68 | 807 | class_device_create(lp_class, MKDEV(LP_MAJOR, nr), NULL, |
1da177e4 LT |
808 | "lp%d", nr); |
809 | devfs_mk_cdev(MKDEV(LP_MAJOR, nr), S_IFCHR | S_IRUGO | S_IWUGO, | |
810 | "printers/%d", nr); | |
811 | ||
812 | printk(KERN_INFO "lp%d: using %s (%s).\n", nr, port->name, | |
813 | (port->irq == PARPORT_IRQ_NONE)?"polling":"interrupt-driven"); | |
814 | ||
815 | #ifdef CONFIG_LP_CONSOLE | |
816 | if (!nr) { | |
817 | if (port->modes & PARPORT_MODE_SAFEININT) { | |
818 | register_console (&lpcons); | |
819 | console_registered = port; | |
820 | printk (KERN_INFO "lp%d: console ready\n", CONSOLE_LP); | |
821 | } else | |
822 | printk (KERN_ERR "lp%d: cannot run console on %s\n", | |
823 | CONSOLE_LP, port->name); | |
824 | } | |
825 | #endif | |
826 | ||
827 | return 0; | |
828 | } | |
829 | ||
830 | static void lp_attach (struct parport *port) | |
831 | { | |
832 | unsigned int i; | |
833 | ||
834 | switch (parport_nr[0]) | |
835 | { | |
836 | case LP_PARPORT_UNSPEC: | |
837 | case LP_PARPORT_AUTO: | |
838 | if (parport_nr[0] == LP_PARPORT_AUTO && | |
839 | port->probe_info[0].class != PARPORT_CLASS_PRINTER) | |
840 | return; | |
841 | if (lp_count == LP_NO) { | |
842 | printk(KERN_INFO "lp: ignoring parallel port (max. %d)\n",LP_NO); | |
843 | return; | |
844 | } | |
845 | if (!lp_register(lp_count, port)) | |
846 | lp_count++; | |
847 | break; | |
848 | ||
849 | default: | |
850 | for (i = 0; i < LP_NO; i++) { | |
851 | if (port->number == parport_nr[i]) { | |
852 | if (!lp_register(i, port)) | |
853 | lp_count++; | |
854 | break; | |
855 | } | |
856 | } | |
857 | break; | |
858 | } | |
859 | } | |
860 | ||
861 | static void lp_detach (struct parport *port) | |
862 | { | |
863 | /* Write this some day. */ | |
864 | #ifdef CONFIG_LP_CONSOLE | |
865 | if (console_registered == port) { | |
866 | unregister_console (&lpcons); | |
867 | console_registered = NULL; | |
868 | } | |
869 | #endif /* CONFIG_LP_CONSOLE */ | |
870 | } | |
871 | ||
872 | static struct parport_driver lp_driver = { | |
873 | .name = "lp", | |
874 | .attach = lp_attach, | |
875 | .detach = lp_detach, | |
876 | }; | |
877 | ||
878 | static int __init lp_init (void) | |
879 | { | |
880 | int i, err = 0; | |
881 | ||
882 | if (parport_nr[0] == LP_PARPORT_OFF) | |
883 | return 0; | |
884 | ||
885 | for (i = 0; i < LP_NO; i++) { | |
886 | lp_table[i].dev = NULL; | |
887 | lp_table[i].flags = 0; | |
888 | lp_table[i].chars = LP_INIT_CHAR; | |
889 | lp_table[i].time = LP_INIT_TIME; | |
890 | lp_table[i].wait = LP_INIT_WAIT; | |
891 | lp_table[i].lp_buffer = NULL; | |
892 | #ifdef LP_STATS | |
893 | lp_table[i].lastcall = 0; | |
894 | lp_table[i].runchars = 0; | |
895 | memset (&lp_table[i].stats, 0, sizeof (struct lp_stats)); | |
896 | #endif | |
897 | lp_table[i].last_error = 0; | |
898 | init_waitqueue_head (&lp_table[i].waitq); | |
899 | init_waitqueue_head (&lp_table[i].dataq); | |
900 | init_MUTEX (&lp_table[i].port_mutex); | |
901 | lp_table[i].timeout = 10 * HZ; | |
902 | } | |
903 | ||
904 | if (register_chrdev (LP_MAJOR, "lp", &lp_fops)) { | |
905 | printk (KERN_ERR "lp: unable to get major %d\n", LP_MAJOR); | |
906 | return -EIO; | |
907 | } | |
908 | ||
909 | devfs_mk_dir("printers"); | |
ca8eca68 | 910 | lp_class = class_create(THIS_MODULE, "printer"); |
1da177e4 LT |
911 | if (IS_ERR(lp_class)) { |
912 | err = PTR_ERR(lp_class); | |
913 | goto out_devfs; | |
914 | } | |
915 | ||
916 | if (parport_register_driver (&lp_driver)) { | |
917 | printk (KERN_ERR "lp: unable to register with parport\n"); | |
918 | err = -EIO; | |
919 | goto out_class; | |
920 | } | |
921 | ||
922 | if (!lp_count) { | |
923 | printk (KERN_INFO "lp: driver loaded but no devices found\n"); | |
924 | #ifndef CONFIG_PARPORT_1284 | |
925 | if (parport_nr[0] == LP_PARPORT_AUTO) | |
926 | printk (KERN_INFO "lp: (is IEEE 1284 support enabled?)\n"); | |
927 | #endif | |
928 | } | |
929 | ||
930 | return 0; | |
931 | ||
932 | out_class: | |
ca8eca68 | 933 | class_destroy(lp_class); |
1da177e4 LT |
934 | out_devfs: |
935 | devfs_remove("printers"); | |
936 | unregister_chrdev(LP_MAJOR, "lp"); | |
937 | return err; | |
938 | } | |
939 | ||
940 | static int __init lp_init_module (void) | |
941 | { | |
942 | if (parport[0]) { | |
943 | /* The user gave some parameters. Let's see what they were. */ | |
944 | if (!strncmp(parport[0], "auto", 4)) | |
945 | parport_nr[0] = LP_PARPORT_AUTO; | |
946 | else { | |
947 | int n; | |
948 | for (n = 0; n < LP_NO && parport[n]; n++) { | |
949 | if (!strncmp(parport[n], "none", 4)) | |
950 | parport_nr[n] = LP_PARPORT_NONE; | |
951 | else { | |
952 | char *ep; | |
953 | unsigned long r = simple_strtoul(parport[n], &ep, 0); | |
954 | if (ep != parport[n]) | |
955 | parport_nr[n] = r; | |
956 | else { | |
957 | printk(KERN_ERR "lp: bad port specifier `%s'\n", parport[n]); | |
958 | return -ENODEV; | |
959 | } | |
960 | } | |
961 | } | |
962 | } | |
963 | } | |
964 | ||
965 | return lp_init(); | |
966 | } | |
967 | ||
968 | static void lp_cleanup_module (void) | |
969 | { | |
970 | unsigned int offset; | |
971 | ||
972 | parport_unregister_driver (&lp_driver); | |
973 | ||
974 | #ifdef CONFIG_LP_CONSOLE | |
975 | unregister_console (&lpcons); | |
976 | #endif | |
977 | ||
978 | unregister_chrdev(LP_MAJOR, "lp"); | |
979 | for (offset = 0; offset < LP_NO; offset++) { | |
980 | if (lp_table[offset].dev == NULL) | |
981 | continue; | |
982 | parport_unregister_device(lp_table[offset].dev); | |
983 | devfs_remove("printers/%d", offset); | |
ca8eca68 | 984 | class_device_destroy(lp_class, MKDEV(LP_MAJOR, offset)); |
1da177e4 LT |
985 | } |
986 | devfs_remove("printers"); | |
ca8eca68 | 987 | class_destroy(lp_class); |
1da177e4 LT |
988 | } |
989 | ||
990 | __setup("lp=", lp_setup); | |
991 | module_init(lp_init_module); | |
992 | module_exit(lp_cleanup_module); | |
993 | ||
994 | MODULE_ALIAS_CHARDEV_MAJOR(LP_MAJOR); | |
995 | MODULE_LICENSE("GPL"); |