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 | ||
1da177e4 LT |
117 | #include <linux/errno.h> |
118 | #include <linux/kernel.h> | |
119 | #include <linux/major.h> | |
120 | #include <linux/sched.h> | |
121 | #include <linux/smp_lock.h> | |
1da177e4 LT |
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> | |
96757701 | 129 | #include <linux/jiffies.h> |
1da177e4 LT |
130 | |
131 | #include <linux/parport.h> | |
132 | #undef LP_STATS | |
133 | #include <linux/lp.h> | |
134 | ||
135 | #include <asm/irq.h> | |
136 | #include <asm/uaccess.h> | |
137 | #include <asm/system.h> | |
138 | ||
139 | /* if you have more than 8 printers, remember to increase LP_NO */ | |
140 | #define LP_NO 8 | |
141 | ||
142 | /* ROUND_UP macro from fs/select.c */ | |
143 | #define ROUND_UP(x,y) (((x)+(y)-1)/(y)) | |
144 | ||
145 | static struct lp_struct lp_table[LP_NO]; | |
146 | ||
147 | static unsigned int lp_count = 0; | |
ca8eca68 | 148 | static struct class *lp_class; |
1da177e4 LT |
149 | |
150 | #ifdef CONFIG_LP_CONSOLE | |
151 | static struct parport *console_registered; // initially NULL | |
152 | #endif /* CONFIG_LP_CONSOLE */ | |
153 | ||
154 | #undef LP_DEBUG | |
155 | ||
156 | /* Bits used to manage claiming the parport device */ | |
157 | #define LP_PREEMPT_REQUEST 1 | |
158 | #define LP_PARPORT_CLAIMED 2 | |
159 | ||
160 | /* --- low-level port access ----------------------------------- */ | |
161 | ||
162 | #define r_dtr(x) (parport_read_data(lp_table[(x)].dev->port)) | |
163 | #define r_str(x) (parport_read_status(lp_table[(x)].dev->port)) | |
164 | #define w_ctr(x,y) do { parport_write_control(lp_table[(x)].dev->port, (y)); } while (0) | |
165 | #define w_dtr(x,y) do { parport_write_data(lp_table[(x)].dev->port, (y)); } while (0) | |
166 | ||
167 | /* Claim the parport or block trying unless we've already claimed it */ | |
168 | static void lp_claim_parport_or_block(struct lp_struct *this_lp) | |
169 | { | |
170 | if (!test_and_set_bit(LP_PARPORT_CLAIMED, &this_lp->bits)) { | |
171 | parport_claim_or_block (this_lp->dev); | |
172 | } | |
173 | } | |
174 | ||
175 | /* Claim the parport or block trying unless we've already claimed it */ | |
176 | static void lp_release_parport(struct lp_struct *this_lp) | |
177 | { | |
178 | if (test_and_clear_bit(LP_PARPORT_CLAIMED, &this_lp->bits)) { | |
179 | parport_release (this_lp->dev); | |
180 | } | |
181 | } | |
182 | ||
183 | ||
184 | ||
185 | static int lp_preempt(void *handle) | |
186 | { | |
187 | struct lp_struct *this_lp = (struct lp_struct *)handle; | |
188 | set_bit(LP_PREEMPT_REQUEST, &this_lp->bits); | |
189 | return (1); | |
190 | } | |
191 | ||
192 | ||
193 | /* | |
194 | * Try to negotiate to a new mode; if unsuccessful negotiate to | |
195 | * compatibility mode. Return the mode we ended up in. | |
196 | */ | |
197 | static int lp_negotiate(struct parport * port, int mode) | |
198 | { | |
199 | if (parport_negotiate (port, mode) != 0) { | |
200 | mode = IEEE1284_MODE_COMPAT; | |
201 | parport_negotiate (port, mode); | |
202 | } | |
203 | ||
204 | return (mode); | |
205 | } | |
206 | ||
207 | static int lp_reset(int minor) | |
208 | { | |
209 | int retval; | |
210 | lp_claim_parport_or_block (&lp_table[minor]); | |
211 | w_ctr(minor, LP_PSELECP); | |
212 | udelay (LP_DELAY); | |
213 | w_ctr(minor, LP_PSELECP | LP_PINITP); | |
214 | retval = r_str(minor); | |
215 | lp_release_parport (&lp_table[minor]); | |
216 | return retval; | |
217 | } | |
218 | ||
219 | static void lp_error (int minor) | |
220 | { | |
221 | DEFINE_WAIT(wait); | |
222 | int polling; | |
223 | ||
224 | if (LP_F(minor) & LP_ABORT) | |
225 | return; | |
226 | ||
227 | polling = lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE; | |
228 | if (polling) lp_release_parport (&lp_table[minor]); | |
229 | prepare_to_wait(&lp_table[minor].waitq, &wait, TASK_INTERRUPTIBLE); | |
230 | schedule_timeout(LP_TIMEOUT_POLLED); | |
231 | finish_wait(&lp_table[minor].waitq, &wait); | |
232 | if (polling) lp_claim_parport_or_block (&lp_table[minor]); | |
233 | else parport_yield_blocking (lp_table[minor].dev); | |
234 | } | |
235 | ||
236 | static int lp_check_status(int minor) | |
237 | { | |
238 | int error = 0; | |
239 | unsigned int last = lp_table[minor].last_error; | |
240 | unsigned char status = r_str(minor); | |
241 | if ((status & LP_PERRORP) && !(LP_F(minor) & LP_CAREFUL)) | |
242 | /* No error. */ | |
243 | last = 0; | |
244 | else if ((status & LP_POUTPA)) { | |
245 | if (last != LP_POUTPA) { | |
246 | last = LP_POUTPA; | |
247 | printk(KERN_INFO "lp%d out of paper\n", minor); | |
248 | } | |
249 | error = -ENOSPC; | |
250 | } else if (!(status & LP_PSELECD)) { | |
251 | if (last != LP_PSELECD) { | |
252 | last = LP_PSELECD; | |
253 | printk(KERN_INFO "lp%d off-line\n", minor); | |
254 | } | |
255 | error = -EIO; | |
256 | } else if (!(status & LP_PERRORP)) { | |
257 | if (last != LP_PERRORP) { | |
258 | last = LP_PERRORP; | |
259 | printk(KERN_INFO "lp%d on fire\n", minor); | |
260 | } | |
261 | error = -EIO; | |
262 | } else { | |
263 | last = 0; /* Come here if LP_CAREFUL is set and no | |
264 | errors are reported. */ | |
265 | } | |
266 | ||
267 | lp_table[minor].last_error = last; | |
268 | ||
269 | if (last != 0) | |
270 | lp_error(minor); | |
271 | ||
272 | return error; | |
273 | } | |
274 | ||
275 | static int lp_wait_ready(int minor, int nonblock) | |
276 | { | |
277 | int error = 0; | |
278 | ||
279 | /* If we're not in compatibility mode, we're ready now! */ | |
280 | if (lp_table[minor].current_mode != IEEE1284_MODE_COMPAT) { | |
281 | return (0); | |
282 | } | |
283 | ||
284 | do { | |
285 | error = lp_check_status (minor); | |
286 | if (error && (nonblock || (LP_F(minor) & LP_ABORT))) | |
287 | break; | |
288 | if (signal_pending (current)) { | |
289 | error = -EINTR; | |
290 | break; | |
291 | } | |
292 | } while (error); | |
293 | return error; | |
294 | } | |
295 | ||
296 | static ssize_t lp_write(struct file * file, const char __user * buf, | |
297 | size_t count, loff_t *ppos) | |
298 | { | |
a7113a96 | 299 | unsigned int minor = iminor(file->f_path.dentry->d_inode); |
1da177e4 LT |
300 | struct parport *port = lp_table[minor].dev->port; |
301 | char *kbuf = lp_table[minor].lp_buffer; | |
302 | ssize_t retv = 0; | |
303 | ssize_t written; | |
304 | size_t copy_size = count; | |
305 | int nonblock = ((file->f_flags & O_NONBLOCK) || | |
306 | (LP_F(minor) & LP_ABORT)); | |
307 | ||
308 | #ifdef LP_STATS | |
96757701 | 309 | if (time_after(jiffies, lp_table[minor].lastcall + LP_TIME(minor))) |
1da177e4 LT |
310 | lp_table[minor].runchars = 0; |
311 | ||
312 | lp_table[minor].lastcall = jiffies; | |
313 | #endif | |
314 | ||
315 | /* Need to copy the data from user-space. */ | |
316 | if (copy_size > LP_BUFFER_SIZE) | |
317 | copy_size = LP_BUFFER_SIZE; | |
318 | ||
319 | if (down_interruptible (&lp_table[minor].port_mutex)) | |
320 | return -EINTR; | |
321 | ||
322 | if (copy_from_user (kbuf, buf, copy_size)) { | |
323 | retv = -EFAULT; | |
324 | goto out_unlock; | |
325 | } | |
326 | ||
327 | /* Claim Parport or sleep until it becomes available | |
328 | */ | |
329 | lp_claim_parport_or_block (&lp_table[minor]); | |
330 | /* Go to the proper mode. */ | |
331 | lp_table[minor].current_mode = lp_negotiate (port, | |
332 | lp_table[minor].best_mode); | |
333 | ||
334 | parport_set_timeout (lp_table[minor].dev, | |
335 | (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK | |
336 | : lp_table[minor].timeout)); | |
337 | ||
338 | if ((retv = lp_wait_ready (minor, nonblock)) == 0) | |
339 | do { | |
340 | /* Write the data. */ | |
341 | written = parport_write (port, kbuf, copy_size); | |
342 | if (written > 0) { | |
343 | copy_size -= written; | |
344 | count -= written; | |
345 | buf += written; | |
346 | retv += written; | |
347 | } | |
348 | ||
349 | if (signal_pending (current)) { | |
350 | if (retv == 0) | |
351 | retv = -EINTR; | |
352 | ||
353 | break; | |
354 | } | |
355 | ||
356 | if (copy_size > 0) { | |
357 | /* incomplete write -> check error ! */ | |
358 | int error; | |
359 | ||
360 | parport_negotiate (lp_table[minor].dev->port, | |
361 | IEEE1284_MODE_COMPAT); | |
362 | lp_table[minor].current_mode = IEEE1284_MODE_COMPAT; | |
363 | ||
364 | error = lp_wait_ready (minor, nonblock); | |
365 | ||
366 | if (error) { | |
367 | if (retv == 0) | |
368 | retv = error; | |
369 | break; | |
370 | } else if (nonblock) { | |
371 | if (retv == 0) | |
372 | retv = -EAGAIN; | |
373 | break; | |
374 | } | |
375 | ||
376 | parport_yield_blocking (lp_table[minor].dev); | |
377 | lp_table[minor].current_mode | |
378 | = lp_negotiate (port, | |
379 | lp_table[minor].best_mode); | |
380 | ||
381 | } else if (need_resched()) | |
382 | schedule (); | |
383 | ||
384 | if (count) { | |
385 | copy_size = count; | |
386 | if (copy_size > LP_BUFFER_SIZE) | |
387 | copy_size = LP_BUFFER_SIZE; | |
388 | ||
389 | if (copy_from_user(kbuf, buf, copy_size)) { | |
390 | if (retv == 0) | |
391 | retv = -EFAULT; | |
392 | break; | |
393 | } | |
394 | } | |
395 | } while (count > 0); | |
396 | ||
397 | if (test_and_clear_bit(LP_PREEMPT_REQUEST, | |
398 | &lp_table[minor].bits)) { | |
399 | printk(KERN_INFO "lp%d releasing parport\n", minor); | |
400 | parport_negotiate (lp_table[minor].dev->port, | |
401 | IEEE1284_MODE_COMPAT); | |
402 | lp_table[minor].current_mode = IEEE1284_MODE_COMPAT; | |
403 | lp_release_parport (&lp_table[minor]); | |
404 | } | |
405 | out_unlock: | |
406 | up (&lp_table[minor].port_mutex); | |
407 | ||
408 | return retv; | |
409 | } | |
410 | ||
411 | #ifdef CONFIG_PARPORT_1284 | |
412 | ||
413 | /* Status readback conforming to ieee1284 */ | |
414 | static ssize_t lp_read(struct file * file, char __user * buf, | |
415 | size_t count, loff_t *ppos) | |
416 | { | |
417 | DEFINE_WAIT(wait); | |
a7113a96 | 418 | unsigned int minor=iminor(file->f_path.dentry->d_inode); |
1da177e4 LT |
419 | struct parport *port = lp_table[minor].dev->port; |
420 | ssize_t retval = 0; | |
421 | char *kbuf = lp_table[minor].lp_buffer; | |
422 | int nonblock = ((file->f_flags & O_NONBLOCK) || | |
423 | (LP_F(minor) & LP_ABORT)); | |
424 | ||
425 | if (count > LP_BUFFER_SIZE) | |
426 | count = LP_BUFFER_SIZE; | |
427 | ||
428 | if (down_interruptible (&lp_table[minor].port_mutex)) | |
429 | return -EINTR; | |
430 | ||
431 | lp_claim_parport_or_block (&lp_table[minor]); | |
432 | ||
433 | parport_set_timeout (lp_table[minor].dev, | |
434 | (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK | |
435 | : lp_table[minor].timeout)); | |
436 | ||
437 | parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT); | |
438 | if (parport_negotiate (lp_table[minor].dev->port, | |
439 | IEEE1284_MODE_NIBBLE)) { | |
440 | retval = -EIO; | |
441 | goto out; | |
442 | } | |
443 | ||
444 | while (retval == 0) { | |
445 | retval = parport_read (port, kbuf, count); | |
446 | ||
447 | if (retval > 0) | |
448 | break; | |
449 | ||
450 | if (nonblock) { | |
451 | retval = -EAGAIN; | |
452 | break; | |
453 | } | |
454 | ||
455 | /* Wait for data. */ | |
456 | ||
457 | if (lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE) { | |
458 | parport_negotiate (lp_table[minor].dev->port, | |
459 | IEEE1284_MODE_COMPAT); | |
460 | lp_error (minor); | |
461 | if (parport_negotiate (lp_table[minor].dev->port, | |
462 | IEEE1284_MODE_NIBBLE)) { | |
463 | retval = -EIO; | |
464 | goto out; | |
465 | } | |
466 | } else { | |
467 | prepare_to_wait(&lp_table[minor].waitq, &wait, TASK_INTERRUPTIBLE); | |
468 | schedule_timeout(LP_TIMEOUT_POLLED); | |
469 | finish_wait(&lp_table[minor].waitq, &wait); | |
470 | } | |
471 | ||
472 | if (signal_pending (current)) { | |
473 | retval = -ERESTARTSYS; | |
474 | break; | |
475 | } | |
476 | ||
477 | cond_resched (); | |
478 | } | |
479 | parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT); | |
480 | out: | |
481 | lp_release_parport (&lp_table[minor]); | |
482 | ||
483 | if (retval > 0 && copy_to_user (buf, kbuf, retval)) | |
484 | retval = -EFAULT; | |
485 | ||
486 | up (&lp_table[minor].port_mutex); | |
487 | ||
488 | return retval; | |
489 | } | |
490 | ||
491 | #endif /* IEEE 1284 support */ | |
492 | ||
493 | static int lp_open(struct inode * inode, struct file * file) | |
494 | { | |
495 | unsigned int minor = iminor(inode); | |
496 | ||
497 | if (minor >= LP_NO) | |
498 | return -ENXIO; | |
499 | if ((LP_F(minor) & LP_EXIST) == 0) | |
500 | return -ENXIO; | |
501 | if (test_and_set_bit(LP_BUSY_BIT_POS, &LP_F(minor))) | |
502 | return -EBUSY; | |
503 | ||
504 | /* If ABORTOPEN is set and the printer is offline or out of paper, | |
505 | we may still want to open it to perform ioctl()s. Therefore we | |
506 | have commandeered O_NONBLOCK, even though it is being used in | |
507 | a non-standard manner. This is strictly a Linux hack, and | |
508 | should most likely only ever be used by the tunelp application. */ | |
509 | if ((LP_F(minor) & LP_ABORTOPEN) && !(file->f_flags & O_NONBLOCK)) { | |
510 | int status; | |
511 | lp_claim_parport_or_block (&lp_table[minor]); | |
512 | status = r_str(minor); | |
513 | lp_release_parport (&lp_table[minor]); | |
514 | if (status & LP_POUTPA) { | |
515 | printk(KERN_INFO "lp%d out of paper\n", minor); | |
516 | LP_F(minor) &= ~LP_BUSY; | |
517 | return -ENOSPC; | |
518 | } else if (!(status & LP_PSELECD)) { | |
519 | printk(KERN_INFO "lp%d off-line\n", minor); | |
520 | LP_F(minor) &= ~LP_BUSY; | |
521 | return -EIO; | |
522 | } else if (!(status & LP_PERRORP)) { | |
523 | printk(KERN_ERR "lp%d printer error\n", minor); | |
524 | LP_F(minor) &= ~LP_BUSY; | |
525 | return -EIO; | |
526 | } | |
527 | } | |
5cbded58 | 528 | lp_table[minor].lp_buffer = kmalloc(LP_BUFFER_SIZE, GFP_KERNEL); |
1da177e4 LT |
529 | if (!lp_table[minor].lp_buffer) { |
530 | LP_F(minor) &= ~LP_BUSY; | |
531 | return -ENOMEM; | |
532 | } | |
533 | /* Determine if the peripheral supports ECP mode */ | |
534 | lp_claim_parport_or_block (&lp_table[minor]); | |
535 | if ( (lp_table[minor].dev->port->modes & PARPORT_MODE_ECP) && | |
536 | !parport_negotiate (lp_table[minor].dev->port, | |
537 | IEEE1284_MODE_ECP)) { | |
538 | printk (KERN_INFO "lp%d: ECP mode\n", minor); | |
539 | lp_table[minor].best_mode = IEEE1284_MODE_ECP; | |
540 | } else { | |
541 | lp_table[minor].best_mode = IEEE1284_MODE_COMPAT; | |
542 | } | |
543 | /* Leave peripheral in compatibility mode */ | |
544 | parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT); | |
545 | lp_release_parport (&lp_table[minor]); | |
546 | lp_table[minor].current_mode = IEEE1284_MODE_COMPAT; | |
547 | return 0; | |
548 | } | |
549 | ||
550 | static int lp_release(struct inode * inode, struct file * file) | |
551 | { | |
552 | unsigned int minor = iminor(inode); | |
553 | ||
554 | lp_claim_parport_or_block (&lp_table[minor]); | |
555 | parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT); | |
556 | lp_table[minor].current_mode = IEEE1284_MODE_COMPAT; | |
557 | lp_release_parport (&lp_table[minor]); | |
558 | kfree(lp_table[minor].lp_buffer); | |
559 | lp_table[minor].lp_buffer = NULL; | |
560 | LP_F(minor) &= ~LP_BUSY; | |
561 | return 0; | |
562 | } | |
563 | ||
564 | static int lp_ioctl(struct inode *inode, struct file *file, | |
565 | unsigned int cmd, unsigned long arg) | |
566 | { | |
567 | unsigned int minor = iminor(inode); | |
568 | int status; | |
569 | int retval = 0; | |
570 | void __user *argp = (void __user *)arg; | |
571 | ||
572 | #ifdef LP_DEBUG | |
573 | printk(KERN_DEBUG "lp%d ioctl, cmd: 0x%x, arg: 0x%lx\n", minor, cmd, arg); | |
574 | #endif | |
575 | if (minor >= LP_NO) | |
576 | return -ENODEV; | |
577 | if ((LP_F(minor) & LP_EXIST) == 0) | |
578 | return -ENODEV; | |
579 | switch ( cmd ) { | |
580 | struct timeval par_timeout; | |
581 | long to_jiffies; | |
582 | ||
583 | case LPTIME: | |
584 | LP_TIME(minor) = arg * HZ/100; | |
585 | break; | |
586 | case LPCHAR: | |
587 | LP_CHAR(minor) = arg; | |
588 | break; | |
589 | case LPABORT: | |
590 | if (arg) | |
591 | LP_F(minor) |= LP_ABORT; | |
592 | else | |
593 | LP_F(minor) &= ~LP_ABORT; | |
594 | break; | |
595 | case LPABORTOPEN: | |
596 | if (arg) | |
597 | LP_F(minor) |= LP_ABORTOPEN; | |
598 | else | |
599 | LP_F(minor) &= ~LP_ABORTOPEN; | |
600 | break; | |
601 | case LPCAREFUL: | |
602 | if (arg) | |
603 | LP_F(minor) |= LP_CAREFUL; | |
604 | else | |
605 | LP_F(minor) &= ~LP_CAREFUL; | |
606 | break; | |
607 | case LPWAIT: | |
608 | LP_WAIT(minor) = arg; | |
609 | break; | |
610 | case LPSETIRQ: | |
611 | return -EINVAL; | |
612 | break; | |
613 | case LPGETIRQ: | |
614 | if (copy_to_user(argp, &LP_IRQ(minor), | |
615 | sizeof(int))) | |
616 | return -EFAULT; | |
617 | break; | |
618 | case LPGETSTATUS: | |
619 | lp_claim_parport_or_block (&lp_table[minor]); | |
620 | status = r_str(minor); | |
621 | lp_release_parport (&lp_table[minor]); | |
622 | ||
623 | if (copy_to_user(argp, &status, sizeof(int))) | |
624 | return -EFAULT; | |
625 | break; | |
626 | case LPRESET: | |
627 | lp_reset(minor); | |
628 | break; | |
629 | #ifdef LP_STATS | |
630 | case LPGETSTATS: | |
631 | if (copy_to_user(argp, &LP_STAT(minor), | |
632 | sizeof(struct lp_stats))) | |
633 | return -EFAULT; | |
634 | if (capable(CAP_SYS_ADMIN)) | |
635 | memset(&LP_STAT(minor), 0, | |
636 | sizeof(struct lp_stats)); | |
637 | break; | |
638 | #endif | |
639 | case LPGETFLAGS: | |
640 | status = LP_F(minor); | |
641 | if (copy_to_user(argp, &status, sizeof(int))) | |
642 | return -EFAULT; | |
643 | break; | |
644 | ||
645 | case LPSETTIMEOUT: | |
646 | if (copy_from_user (&par_timeout, argp, | |
647 | sizeof (struct timeval))) { | |
648 | return -EFAULT; | |
649 | } | |
650 | /* Convert to jiffies, place in lp_table */ | |
651 | if ((par_timeout.tv_sec < 0) || | |
652 | (par_timeout.tv_usec < 0)) { | |
653 | return -EINVAL; | |
654 | } | |
655 | to_jiffies = ROUND_UP(par_timeout.tv_usec, 1000000/HZ); | |
656 | to_jiffies += par_timeout.tv_sec * (long) HZ; | |
657 | if (to_jiffies <= 0) { | |
658 | return -EINVAL; | |
659 | } | |
660 | lp_table[minor].timeout = to_jiffies; | |
661 | break; | |
662 | ||
663 | default: | |
664 | retval = -EINVAL; | |
665 | } | |
666 | return retval; | |
667 | } | |
668 | ||
62322d25 | 669 | static const struct file_operations lp_fops = { |
1da177e4 LT |
670 | .owner = THIS_MODULE, |
671 | .write = lp_write, | |
672 | .ioctl = lp_ioctl, | |
673 | .open = lp_open, | |
674 | .release = lp_release, | |
675 | #ifdef CONFIG_PARPORT_1284 | |
676 | .read = lp_read, | |
677 | #endif | |
678 | }; | |
679 | ||
680 | /* --- support for console on the line printer ----------------- */ | |
681 | ||
682 | #ifdef CONFIG_LP_CONSOLE | |
683 | ||
684 | #define CONSOLE_LP 0 | |
685 | ||
686 | /* If the printer is out of paper, we can either lose the messages or | |
687 | * stall until the printer is happy again. Define CONSOLE_LP_STRICT | |
688 | * non-zero to get the latter behaviour. */ | |
689 | #define CONSOLE_LP_STRICT 1 | |
690 | ||
691 | /* The console must be locked when we get here. */ | |
692 | ||
693 | static void lp_console_write (struct console *co, const char *s, | |
694 | unsigned count) | |
695 | { | |
696 | struct pardevice *dev = lp_table[CONSOLE_LP].dev; | |
697 | struct parport *port = dev->port; | |
698 | ssize_t written; | |
699 | ||
700 | if (parport_claim (dev)) | |
701 | /* Nothing we can do. */ | |
702 | return; | |
703 | ||
704 | parport_set_timeout (dev, 0); | |
705 | ||
706 | /* Go to compatibility mode. */ | |
707 | parport_negotiate (port, IEEE1284_MODE_COMPAT); | |
708 | ||
709 | do { | |
710 | /* Write the data, converting LF->CRLF as we go. */ | |
711 | ssize_t canwrite = count; | |
712 | char *lf = memchr (s, '\n', count); | |
713 | if (lf) | |
714 | canwrite = lf - s; | |
715 | ||
716 | if (canwrite > 0) { | |
717 | written = parport_write (port, s, canwrite); | |
718 | ||
719 | if (written <= 0) | |
720 | continue; | |
721 | ||
722 | s += written; | |
723 | count -= written; | |
724 | canwrite -= written; | |
725 | } | |
726 | ||
727 | if (lf && canwrite <= 0) { | |
728 | const char *crlf = "\r\n"; | |
729 | int i = 2; | |
730 | ||
731 | /* Dodge the original '\n', and put '\r\n' instead. */ | |
732 | s++; | |
733 | count--; | |
734 | do { | |
735 | written = parport_write (port, crlf, i); | |
736 | if (written > 0) | |
737 | i -= written, crlf += written; | |
738 | } while (i > 0 && (CONSOLE_LP_STRICT || written > 0)); | |
739 | } | |
740 | } while (count > 0 && (CONSOLE_LP_STRICT || written > 0)); | |
741 | ||
742 | parport_release (dev); | |
743 | } | |
744 | ||
745 | static struct console lpcons = { | |
746 | .name = "lp", | |
747 | .write = lp_console_write, | |
748 | .flags = CON_PRINTBUFFER, | |
749 | }; | |
750 | ||
751 | #endif /* console on line printer */ | |
752 | ||
753 | /* --- initialisation code ------------------------------------- */ | |
754 | ||
755 | static int parport_nr[LP_NO] = { [0 ... LP_NO-1] = LP_PARPORT_UNSPEC }; | |
756 | static char *parport[LP_NO] = { NULL, }; | |
757 | static int reset = 0; | |
758 | ||
759 | module_param_array(parport, charp, NULL, 0); | |
760 | module_param(reset, bool, 0); | |
761 | ||
762 | #ifndef MODULE | |
763 | static int __init lp_setup (char *str) | |
764 | { | |
765 | static int parport_ptr; // initially zero | |
766 | int x; | |
767 | ||
768 | if (get_option (&str, &x)) { | |
769 | if (x == 0) { | |
770 | /* disable driver on "lp=" or "lp=0" */ | |
771 | parport_nr[0] = LP_PARPORT_OFF; | |
772 | } else { | |
773 | printk(KERN_WARNING "warning: 'lp=0x%x' is deprecated, ignored\n", x); | |
774 | return 0; | |
775 | } | |
776 | } else if (!strncmp(str, "parport", 7)) { | |
777 | int n = simple_strtoul(str+7, NULL, 10); | |
778 | if (parport_ptr < LP_NO) | |
779 | parport_nr[parport_ptr++] = n; | |
780 | else | |
781 | printk(KERN_INFO "lp: too many ports, %s ignored.\n", | |
782 | str); | |
783 | } else if (!strcmp(str, "auto")) { | |
784 | parport_nr[0] = LP_PARPORT_AUTO; | |
785 | } else if (!strcmp(str, "none")) { | |
786 | parport_nr[parport_ptr++] = LP_PARPORT_NONE; | |
787 | } else if (!strcmp(str, "reset")) { | |
788 | reset = 1; | |
789 | } | |
790 | return 1; | |
791 | } | |
792 | #endif | |
793 | ||
794 | static int lp_register(int nr, struct parport *port) | |
795 | { | |
796 | lp_table[nr].dev = parport_register_device(port, "lp", | |
797 | lp_preempt, NULL, NULL, 0, | |
798 | (void *) &lp_table[nr]); | |
799 | if (lp_table[nr].dev == NULL) | |
800 | return 1; | |
801 | lp_table[nr].flags |= LP_EXIST; | |
802 | ||
803 | if (reset) | |
804 | lp_reset(nr); | |
805 | ||
53f46542 | 806 | class_device_create(lp_class, NULL, MKDEV(LP_MAJOR, nr), NULL, |
1da177e4 | 807 | "lp%d", nr); |
1da177e4 LT |
808 | |
809 | printk(KERN_INFO "lp%d: using %s (%s).\n", nr, port->name, | |
810 | (port->irq == PARPORT_IRQ_NONE)?"polling":"interrupt-driven"); | |
811 | ||
812 | #ifdef CONFIG_LP_CONSOLE | |
813 | if (!nr) { | |
814 | if (port->modes & PARPORT_MODE_SAFEININT) { | |
815 | register_console (&lpcons); | |
816 | console_registered = port; | |
817 | printk (KERN_INFO "lp%d: console ready\n", CONSOLE_LP); | |
818 | } else | |
819 | printk (KERN_ERR "lp%d: cannot run console on %s\n", | |
820 | CONSOLE_LP, port->name); | |
821 | } | |
822 | #endif | |
823 | ||
824 | return 0; | |
825 | } | |
826 | ||
827 | static void lp_attach (struct parport *port) | |
828 | { | |
829 | unsigned int i; | |
830 | ||
831 | switch (parport_nr[0]) | |
832 | { | |
833 | case LP_PARPORT_UNSPEC: | |
834 | case LP_PARPORT_AUTO: | |
835 | if (parport_nr[0] == LP_PARPORT_AUTO && | |
836 | port->probe_info[0].class != PARPORT_CLASS_PRINTER) | |
837 | return; | |
838 | if (lp_count == LP_NO) { | |
839 | printk(KERN_INFO "lp: ignoring parallel port (max. %d)\n",LP_NO); | |
840 | return; | |
841 | } | |
842 | if (!lp_register(lp_count, port)) | |
843 | lp_count++; | |
844 | break; | |
845 | ||
846 | default: | |
847 | for (i = 0; i < LP_NO; i++) { | |
848 | if (port->number == parport_nr[i]) { | |
849 | if (!lp_register(i, port)) | |
850 | lp_count++; | |
851 | break; | |
852 | } | |
853 | } | |
854 | break; | |
855 | } | |
856 | } | |
857 | ||
858 | static void lp_detach (struct parport *port) | |
859 | { | |
860 | /* Write this some day. */ | |
861 | #ifdef CONFIG_LP_CONSOLE | |
862 | if (console_registered == port) { | |
863 | unregister_console (&lpcons); | |
864 | console_registered = NULL; | |
865 | } | |
866 | #endif /* CONFIG_LP_CONSOLE */ | |
867 | } | |
868 | ||
869 | static struct parport_driver lp_driver = { | |
870 | .name = "lp", | |
871 | .attach = lp_attach, | |
872 | .detach = lp_detach, | |
873 | }; | |
874 | ||
875 | static int __init lp_init (void) | |
876 | { | |
877 | int i, err = 0; | |
878 | ||
879 | if (parport_nr[0] == LP_PARPORT_OFF) | |
880 | return 0; | |
881 | ||
882 | for (i = 0; i < LP_NO; i++) { | |
883 | lp_table[i].dev = NULL; | |
884 | lp_table[i].flags = 0; | |
885 | lp_table[i].chars = LP_INIT_CHAR; | |
886 | lp_table[i].time = LP_INIT_TIME; | |
887 | lp_table[i].wait = LP_INIT_WAIT; | |
888 | lp_table[i].lp_buffer = NULL; | |
889 | #ifdef LP_STATS | |
890 | lp_table[i].lastcall = 0; | |
891 | lp_table[i].runchars = 0; | |
892 | memset (&lp_table[i].stats, 0, sizeof (struct lp_stats)); | |
893 | #endif | |
894 | lp_table[i].last_error = 0; | |
895 | init_waitqueue_head (&lp_table[i].waitq); | |
896 | init_waitqueue_head (&lp_table[i].dataq); | |
897 | init_MUTEX (&lp_table[i].port_mutex); | |
898 | lp_table[i].timeout = 10 * HZ; | |
899 | } | |
900 | ||
901 | if (register_chrdev (LP_MAJOR, "lp", &lp_fops)) { | |
902 | printk (KERN_ERR "lp: unable to get major %d\n", LP_MAJOR); | |
903 | return -EIO; | |
904 | } | |
905 | ||
ca8eca68 | 906 | lp_class = class_create(THIS_MODULE, "printer"); |
1da177e4 LT |
907 | if (IS_ERR(lp_class)) { |
908 | err = PTR_ERR(lp_class); | |
d09d7ddf | 909 | goto out_reg; |
1da177e4 LT |
910 | } |
911 | ||
912 | if (parport_register_driver (&lp_driver)) { | |
913 | printk (KERN_ERR "lp: unable to register with parport\n"); | |
914 | err = -EIO; | |
915 | goto out_class; | |
916 | } | |
917 | ||
918 | if (!lp_count) { | |
919 | printk (KERN_INFO "lp: driver loaded but no devices found\n"); | |
920 | #ifndef CONFIG_PARPORT_1284 | |
921 | if (parport_nr[0] == LP_PARPORT_AUTO) | |
922 | printk (KERN_INFO "lp: (is IEEE 1284 support enabled?)\n"); | |
923 | #endif | |
924 | } | |
925 | ||
926 | return 0; | |
927 | ||
928 | out_class: | |
ca8eca68 | 929 | class_destroy(lp_class); |
d09d7ddf | 930 | out_reg: |
1da177e4 LT |
931 | unregister_chrdev(LP_MAJOR, "lp"); |
932 | return err; | |
933 | } | |
934 | ||
935 | static int __init lp_init_module (void) | |
936 | { | |
937 | if (parport[0]) { | |
938 | /* The user gave some parameters. Let's see what they were. */ | |
939 | if (!strncmp(parport[0], "auto", 4)) | |
940 | parport_nr[0] = LP_PARPORT_AUTO; | |
941 | else { | |
942 | int n; | |
943 | for (n = 0; n < LP_NO && parport[n]; n++) { | |
944 | if (!strncmp(parport[n], "none", 4)) | |
945 | parport_nr[n] = LP_PARPORT_NONE; | |
946 | else { | |
947 | char *ep; | |
948 | unsigned long r = simple_strtoul(parport[n], &ep, 0); | |
949 | if (ep != parport[n]) | |
950 | parport_nr[n] = r; | |
951 | else { | |
952 | printk(KERN_ERR "lp: bad port specifier `%s'\n", parport[n]); | |
953 | return -ENODEV; | |
954 | } | |
955 | } | |
956 | } | |
957 | } | |
958 | } | |
959 | ||
960 | return lp_init(); | |
961 | } | |
962 | ||
963 | static void lp_cleanup_module (void) | |
964 | { | |
965 | unsigned int offset; | |
966 | ||
967 | parport_unregister_driver (&lp_driver); | |
968 | ||
969 | #ifdef CONFIG_LP_CONSOLE | |
970 | unregister_console (&lpcons); | |
971 | #endif | |
972 | ||
973 | unregister_chrdev(LP_MAJOR, "lp"); | |
974 | for (offset = 0; offset < LP_NO; offset++) { | |
975 | if (lp_table[offset].dev == NULL) | |
976 | continue; | |
977 | parport_unregister_device(lp_table[offset].dev); | |
ca8eca68 | 978 | class_device_destroy(lp_class, MKDEV(LP_MAJOR, offset)); |
1da177e4 | 979 | } |
ca8eca68 | 980 | class_destroy(lp_class); |
1da177e4 LT |
981 | } |
982 | ||
983 | __setup("lp=", lp_setup); | |
984 | module_init(lp_init_module); | |
985 | module_exit(lp_cleanup_module); | |
986 | ||
987 | MODULE_ALIAS_CHARDEV_MAJOR(LP_MAJOR); | |
988 | MODULE_LICENSE("GPL"); |