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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> | |
1da177e4 LT |
121 | #include <linux/slab.h> |
122 | #include <linux/fcntl.h> | |
123 | #include <linux/delay.h> | |
124 | #include <linux/poll.h> | |
125 | #include <linux/console.h> | |
126 | #include <linux/device.h> | |
127 | #include <linux/wait.h> | |
96757701 | 128 | #include <linux/jiffies.h> |
1da177e4 LT |
129 | |
130 | #include <linux/parport.h> | |
131 | #undef LP_STATS | |
132 | #include <linux/lp.h> | |
133 | ||
134 | #include <asm/irq.h> | |
135 | #include <asm/uaccess.h> | |
136 | #include <asm/system.h> | |
137 | ||
138 | /* if you have more than 8 printers, remember to increase LP_NO */ | |
139 | #define LP_NO 8 | |
140 | ||
141 | /* ROUND_UP macro from fs/select.c */ | |
142 | #define ROUND_UP(x,y) (((x)+(y)-1)/(y)) | |
143 | ||
144 | static struct lp_struct lp_table[LP_NO]; | |
145 | ||
146 | static unsigned int lp_count = 0; | |
ca8eca68 | 147 | static struct class *lp_class; |
1da177e4 LT |
148 | |
149 | #ifdef CONFIG_LP_CONSOLE | |
150 | static struct parport *console_registered; // initially NULL | |
151 | #endif /* CONFIG_LP_CONSOLE */ | |
152 | ||
153 | #undef LP_DEBUG | |
154 | ||
155 | /* Bits used to manage claiming the parport device */ | |
156 | #define LP_PREEMPT_REQUEST 1 | |
157 | #define LP_PARPORT_CLAIMED 2 | |
158 | ||
159 | /* --- low-level port access ----------------------------------- */ | |
160 | ||
161 | #define r_dtr(x) (parport_read_data(lp_table[(x)].dev->port)) | |
162 | #define r_str(x) (parport_read_status(lp_table[(x)].dev->port)) | |
163 | #define w_ctr(x,y) do { parport_write_control(lp_table[(x)].dev->port, (y)); } while (0) | |
164 | #define w_dtr(x,y) do { parport_write_data(lp_table[(x)].dev->port, (y)); } while (0) | |
165 | ||
166 | /* Claim the parport or block trying unless we've already claimed it */ | |
167 | static void lp_claim_parport_or_block(struct lp_struct *this_lp) | |
168 | { | |
169 | if (!test_and_set_bit(LP_PARPORT_CLAIMED, &this_lp->bits)) { | |
170 | parport_claim_or_block (this_lp->dev); | |
171 | } | |
172 | } | |
173 | ||
174 | /* Claim the parport or block trying unless we've already claimed it */ | |
175 | static void lp_release_parport(struct lp_struct *this_lp) | |
176 | { | |
177 | if (test_and_clear_bit(LP_PARPORT_CLAIMED, &this_lp->bits)) { | |
178 | parport_release (this_lp->dev); | |
179 | } | |
180 | } | |
181 | ||
182 | ||
183 | ||
184 | static int lp_preempt(void *handle) | |
185 | { | |
186 | struct lp_struct *this_lp = (struct lp_struct *)handle; | |
187 | set_bit(LP_PREEMPT_REQUEST, &this_lp->bits); | |
188 | return (1); | |
189 | } | |
190 | ||
191 | ||
192 | /* | |
193 | * Try to negotiate to a new mode; if unsuccessful negotiate to | |
194 | * compatibility mode. Return the mode we ended up in. | |
195 | */ | |
196 | static int lp_negotiate(struct parport * port, int mode) | |
197 | { | |
198 | if (parport_negotiate (port, mode) != 0) { | |
199 | mode = IEEE1284_MODE_COMPAT; | |
200 | parport_negotiate (port, mode); | |
201 | } | |
202 | ||
203 | return (mode); | |
204 | } | |
205 | ||
206 | static int lp_reset(int minor) | |
207 | { | |
208 | int retval; | |
209 | lp_claim_parport_or_block (&lp_table[minor]); | |
210 | w_ctr(minor, LP_PSELECP); | |
211 | udelay (LP_DELAY); | |
212 | w_ctr(minor, LP_PSELECP | LP_PINITP); | |
213 | retval = r_str(minor); | |
214 | lp_release_parport (&lp_table[minor]); | |
215 | return retval; | |
216 | } | |
217 | ||
218 | static void lp_error (int minor) | |
219 | { | |
220 | DEFINE_WAIT(wait); | |
221 | int polling; | |
222 | ||
223 | if (LP_F(minor) & LP_ABORT) | |
224 | return; | |
225 | ||
226 | polling = lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE; | |
227 | if (polling) lp_release_parport (&lp_table[minor]); | |
228 | prepare_to_wait(&lp_table[minor].waitq, &wait, TASK_INTERRUPTIBLE); | |
229 | schedule_timeout(LP_TIMEOUT_POLLED); | |
230 | finish_wait(&lp_table[minor].waitq, &wait); | |
231 | if (polling) lp_claim_parport_or_block (&lp_table[minor]); | |
232 | else parport_yield_blocking (lp_table[minor].dev); | |
233 | } | |
234 | ||
235 | static int lp_check_status(int minor) | |
236 | { | |
237 | int error = 0; | |
238 | unsigned int last = lp_table[minor].last_error; | |
239 | unsigned char status = r_str(minor); | |
240 | if ((status & LP_PERRORP) && !(LP_F(minor) & LP_CAREFUL)) | |
241 | /* No error. */ | |
242 | last = 0; | |
243 | else if ((status & LP_POUTPA)) { | |
244 | if (last != LP_POUTPA) { | |
245 | last = LP_POUTPA; | |
246 | printk(KERN_INFO "lp%d out of paper\n", minor); | |
247 | } | |
248 | error = -ENOSPC; | |
249 | } else if (!(status & LP_PSELECD)) { | |
250 | if (last != LP_PSELECD) { | |
251 | last = LP_PSELECD; | |
252 | printk(KERN_INFO "lp%d off-line\n", minor); | |
253 | } | |
254 | error = -EIO; | |
255 | } else if (!(status & LP_PERRORP)) { | |
256 | if (last != LP_PERRORP) { | |
257 | last = LP_PERRORP; | |
258 | printk(KERN_INFO "lp%d on fire\n", minor); | |
259 | } | |
260 | error = -EIO; | |
261 | } else { | |
262 | last = 0; /* Come here if LP_CAREFUL is set and no | |
263 | errors are reported. */ | |
264 | } | |
265 | ||
266 | lp_table[minor].last_error = last; | |
267 | ||
268 | if (last != 0) | |
269 | lp_error(minor); | |
270 | ||
271 | return error; | |
272 | } | |
273 | ||
274 | static int lp_wait_ready(int minor, int nonblock) | |
275 | { | |
276 | int error = 0; | |
277 | ||
278 | /* If we're not in compatibility mode, we're ready now! */ | |
279 | if (lp_table[minor].current_mode != IEEE1284_MODE_COMPAT) { | |
280 | return (0); | |
281 | } | |
282 | ||
283 | do { | |
284 | error = lp_check_status (minor); | |
285 | if (error && (nonblock || (LP_F(minor) & LP_ABORT))) | |
286 | break; | |
287 | if (signal_pending (current)) { | |
288 | error = -EINTR; | |
289 | break; | |
290 | } | |
291 | } while (error); | |
292 | return error; | |
293 | } | |
294 | ||
295 | static ssize_t lp_write(struct file * file, const char __user * buf, | |
296 | size_t count, loff_t *ppos) | |
297 | { | |
a7113a96 | 298 | unsigned int minor = iminor(file->f_path.dentry->d_inode); |
1da177e4 LT |
299 | struct parport *port = lp_table[minor].dev->port; |
300 | char *kbuf = lp_table[minor].lp_buffer; | |
301 | ssize_t retv = 0; | |
302 | ssize_t written; | |
303 | size_t copy_size = count; | |
304 | int nonblock = ((file->f_flags & O_NONBLOCK) || | |
305 | (LP_F(minor) & LP_ABORT)); | |
306 | ||
307 | #ifdef LP_STATS | |
96757701 | 308 | if (time_after(jiffies, lp_table[minor].lastcall + LP_TIME(minor))) |
1da177e4 LT |
309 | lp_table[minor].runchars = 0; |
310 | ||
311 | lp_table[minor].lastcall = jiffies; | |
312 | #endif | |
313 | ||
314 | /* Need to copy the data from user-space. */ | |
315 | if (copy_size > LP_BUFFER_SIZE) | |
316 | copy_size = LP_BUFFER_SIZE; | |
317 | ||
318 | if (down_interruptible (&lp_table[minor].port_mutex)) | |
319 | return -EINTR; | |
320 | ||
321 | if (copy_from_user (kbuf, buf, copy_size)) { | |
322 | retv = -EFAULT; | |
323 | goto out_unlock; | |
324 | } | |
325 | ||
326 | /* Claim Parport or sleep until it becomes available | |
327 | */ | |
328 | lp_claim_parport_or_block (&lp_table[minor]); | |
329 | /* Go to the proper mode. */ | |
330 | lp_table[minor].current_mode = lp_negotiate (port, | |
331 | lp_table[minor].best_mode); | |
332 | ||
333 | parport_set_timeout (lp_table[minor].dev, | |
334 | (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK | |
335 | : lp_table[minor].timeout)); | |
336 | ||
337 | if ((retv = lp_wait_ready (minor, nonblock)) == 0) | |
338 | do { | |
339 | /* Write the data. */ | |
340 | written = parport_write (port, kbuf, copy_size); | |
341 | if (written > 0) { | |
342 | copy_size -= written; | |
343 | count -= written; | |
344 | buf += written; | |
345 | retv += written; | |
346 | } | |
347 | ||
348 | if (signal_pending (current)) { | |
349 | if (retv == 0) | |
350 | retv = -EINTR; | |
351 | ||
352 | break; | |
353 | } | |
354 | ||
355 | if (copy_size > 0) { | |
356 | /* incomplete write -> check error ! */ | |
357 | int error; | |
358 | ||
359 | parport_negotiate (lp_table[minor].dev->port, | |
360 | IEEE1284_MODE_COMPAT); | |
361 | lp_table[minor].current_mode = IEEE1284_MODE_COMPAT; | |
362 | ||
363 | error = lp_wait_ready (minor, nonblock); | |
364 | ||
365 | if (error) { | |
366 | if (retv == 0) | |
367 | retv = error; | |
368 | break; | |
369 | } else if (nonblock) { | |
370 | if (retv == 0) | |
371 | retv = -EAGAIN; | |
372 | break; | |
373 | } | |
374 | ||
375 | parport_yield_blocking (lp_table[minor].dev); | |
376 | lp_table[minor].current_mode | |
377 | = lp_negotiate (port, | |
378 | lp_table[minor].best_mode); | |
379 | ||
380 | } else if (need_resched()) | |
381 | schedule (); | |
382 | ||
383 | if (count) { | |
384 | copy_size = count; | |
385 | if (copy_size > LP_BUFFER_SIZE) | |
386 | copy_size = LP_BUFFER_SIZE; | |
387 | ||
388 | if (copy_from_user(kbuf, buf, copy_size)) { | |
389 | if (retv == 0) | |
390 | retv = -EFAULT; | |
391 | break; | |
392 | } | |
393 | } | |
394 | } while (count > 0); | |
395 | ||
396 | if (test_and_clear_bit(LP_PREEMPT_REQUEST, | |
397 | &lp_table[minor].bits)) { | |
398 | printk(KERN_INFO "lp%d releasing parport\n", minor); | |
399 | parport_negotiate (lp_table[minor].dev->port, | |
400 | IEEE1284_MODE_COMPAT); | |
401 | lp_table[minor].current_mode = IEEE1284_MODE_COMPAT; | |
402 | lp_release_parport (&lp_table[minor]); | |
403 | } | |
404 | out_unlock: | |
405 | up (&lp_table[minor].port_mutex); | |
406 | ||
407 | return retv; | |
408 | } | |
409 | ||
410 | #ifdef CONFIG_PARPORT_1284 | |
411 | ||
412 | /* Status readback conforming to ieee1284 */ | |
413 | static ssize_t lp_read(struct file * file, char __user * buf, | |
414 | size_t count, loff_t *ppos) | |
415 | { | |
416 | DEFINE_WAIT(wait); | |
a7113a96 | 417 | unsigned int minor=iminor(file->f_path.dentry->d_inode); |
1da177e4 LT |
418 | struct parport *port = lp_table[minor].dev->port; |
419 | ssize_t retval = 0; | |
420 | char *kbuf = lp_table[minor].lp_buffer; | |
421 | int nonblock = ((file->f_flags & O_NONBLOCK) || | |
422 | (LP_F(minor) & LP_ABORT)); | |
423 | ||
424 | if (count > LP_BUFFER_SIZE) | |
425 | count = LP_BUFFER_SIZE; | |
426 | ||
427 | if (down_interruptible (&lp_table[minor].port_mutex)) | |
428 | return -EINTR; | |
429 | ||
430 | lp_claim_parport_or_block (&lp_table[minor]); | |
431 | ||
432 | parport_set_timeout (lp_table[minor].dev, | |
433 | (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK | |
434 | : lp_table[minor].timeout)); | |
435 | ||
436 | parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT); | |
437 | if (parport_negotiate (lp_table[minor].dev->port, | |
438 | IEEE1284_MODE_NIBBLE)) { | |
439 | retval = -EIO; | |
440 | goto out; | |
441 | } | |
442 | ||
443 | while (retval == 0) { | |
444 | retval = parport_read (port, kbuf, count); | |
445 | ||
446 | if (retval > 0) | |
447 | break; | |
448 | ||
449 | if (nonblock) { | |
450 | retval = -EAGAIN; | |
451 | break; | |
452 | } | |
453 | ||
454 | /* Wait for data. */ | |
455 | ||
456 | if (lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE) { | |
457 | parport_negotiate (lp_table[minor].dev->port, | |
458 | IEEE1284_MODE_COMPAT); | |
459 | lp_error (minor); | |
460 | if (parport_negotiate (lp_table[minor].dev->port, | |
461 | IEEE1284_MODE_NIBBLE)) { | |
462 | retval = -EIO; | |
463 | goto out; | |
464 | } | |
465 | } else { | |
466 | prepare_to_wait(&lp_table[minor].waitq, &wait, TASK_INTERRUPTIBLE); | |
467 | schedule_timeout(LP_TIMEOUT_POLLED); | |
468 | finish_wait(&lp_table[minor].waitq, &wait); | |
469 | } | |
470 | ||
471 | if (signal_pending (current)) { | |
472 | retval = -ERESTARTSYS; | |
473 | break; | |
474 | } | |
475 | ||
476 | cond_resched (); | |
477 | } | |
478 | parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT); | |
479 | out: | |
480 | lp_release_parport (&lp_table[minor]); | |
481 | ||
482 | if (retval > 0 && copy_to_user (buf, kbuf, retval)) | |
483 | retval = -EFAULT; | |
484 | ||
485 | up (&lp_table[minor].port_mutex); | |
486 | ||
487 | return retval; | |
488 | } | |
489 | ||
490 | #endif /* IEEE 1284 support */ | |
491 | ||
492 | static int lp_open(struct inode * inode, struct file * file) | |
493 | { | |
494 | unsigned int minor = iminor(inode); | |
495 | ||
496 | if (minor >= LP_NO) | |
497 | return -ENXIO; | |
498 | if ((LP_F(minor) & LP_EXIST) == 0) | |
499 | return -ENXIO; | |
500 | if (test_and_set_bit(LP_BUSY_BIT_POS, &LP_F(minor))) | |
501 | return -EBUSY; | |
502 | ||
503 | /* If ABORTOPEN is set and the printer is offline or out of paper, | |
504 | we may still want to open it to perform ioctl()s. Therefore we | |
505 | have commandeered O_NONBLOCK, even though it is being used in | |
506 | a non-standard manner. This is strictly a Linux hack, and | |
507 | should most likely only ever be used by the tunelp application. */ | |
508 | if ((LP_F(minor) & LP_ABORTOPEN) && !(file->f_flags & O_NONBLOCK)) { | |
509 | int status; | |
510 | lp_claim_parport_or_block (&lp_table[minor]); | |
511 | status = r_str(minor); | |
512 | lp_release_parport (&lp_table[minor]); | |
513 | if (status & LP_POUTPA) { | |
514 | printk(KERN_INFO "lp%d out of paper\n", minor); | |
515 | LP_F(minor) &= ~LP_BUSY; | |
516 | return -ENOSPC; | |
517 | } else if (!(status & LP_PSELECD)) { | |
518 | printk(KERN_INFO "lp%d off-line\n", minor); | |
519 | LP_F(minor) &= ~LP_BUSY; | |
520 | return -EIO; | |
521 | } else if (!(status & LP_PERRORP)) { | |
522 | printk(KERN_ERR "lp%d printer error\n", minor); | |
523 | LP_F(minor) &= ~LP_BUSY; | |
524 | return -EIO; | |
525 | } | |
526 | } | |
5cbded58 | 527 | lp_table[minor].lp_buffer = kmalloc(LP_BUFFER_SIZE, GFP_KERNEL); |
1da177e4 LT |
528 | if (!lp_table[minor].lp_buffer) { |
529 | LP_F(minor) &= ~LP_BUSY; | |
530 | return -ENOMEM; | |
531 | } | |
532 | /* Determine if the peripheral supports ECP mode */ | |
533 | lp_claim_parport_or_block (&lp_table[minor]); | |
534 | if ( (lp_table[minor].dev->port->modes & PARPORT_MODE_ECP) && | |
535 | !parport_negotiate (lp_table[minor].dev->port, | |
536 | IEEE1284_MODE_ECP)) { | |
537 | printk (KERN_INFO "lp%d: ECP mode\n", minor); | |
538 | lp_table[minor].best_mode = IEEE1284_MODE_ECP; | |
539 | } else { | |
540 | lp_table[minor].best_mode = IEEE1284_MODE_COMPAT; | |
541 | } | |
542 | /* Leave peripheral in compatibility mode */ | |
543 | parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT); | |
544 | lp_release_parport (&lp_table[minor]); | |
545 | lp_table[minor].current_mode = IEEE1284_MODE_COMPAT; | |
546 | return 0; | |
547 | } | |
548 | ||
549 | static int lp_release(struct inode * inode, struct file * file) | |
550 | { | |
551 | unsigned int minor = iminor(inode); | |
552 | ||
553 | lp_claim_parport_or_block (&lp_table[minor]); | |
554 | parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT); | |
555 | lp_table[minor].current_mode = IEEE1284_MODE_COMPAT; | |
556 | lp_release_parport (&lp_table[minor]); | |
557 | kfree(lp_table[minor].lp_buffer); | |
558 | lp_table[minor].lp_buffer = NULL; | |
559 | LP_F(minor) &= ~LP_BUSY; | |
560 | return 0; | |
561 | } | |
562 | ||
563 | static int lp_ioctl(struct inode *inode, struct file *file, | |
564 | unsigned int cmd, unsigned long arg) | |
565 | { | |
566 | unsigned int minor = iminor(inode); | |
567 | int status; | |
568 | int retval = 0; | |
569 | void __user *argp = (void __user *)arg; | |
570 | ||
571 | #ifdef LP_DEBUG | |
572 | printk(KERN_DEBUG "lp%d ioctl, cmd: 0x%x, arg: 0x%lx\n", minor, cmd, arg); | |
573 | #endif | |
574 | if (minor >= LP_NO) | |
575 | return -ENODEV; | |
576 | if ((LP_F(minor) & LP_EXIST) == 0) | |
577 | return -ENODEV; | |
578 | switch ( cmd ) { | |
579 | struct timeval par_timeout; | |
580 | long to_jiffies; | |
581 | ||
582 | case LPTIME: | |
583 | LP_TIME(minor) = arg * HZ/100; | |
584 | break; | |
585 | case LPCHAR: | |
586 | LP_CHAR(minor) = arg; | |
587 | break; | |
588 | case LPABORT: | |
589 | if (arg) | |
590 | LP_F(minor) |= LP_ABORT; | |
591 | else | |
592 | LP_F(minor) &= ~LP_ABORT; | |
593 | break; | |
594 | case LPABORTOPEN: | |
595 | if (arg) | |
596 | LP_F(minor) |= LP_ABORTOPEN; | |
597 | else | |
598 | LP_F(minor) &= ~LP_ABORTOPEN; | |
599 | break; | |
600 | case LPCAREFUL: | |
601 | if (arg) | |
602 | LP_F(minor) |= LP_CAREFUL; | |
603 | else | |
604 | LP_F(minor) &= ~LP_CAREFUL; | |
605 | break; | |
606 | case LPWAIT: | |
607 | LP_WAIT(minor) = arg; | |
608 | break; | |
609 | case LPSETIRQ: | |
610 | return -EINVAL; | |
611 | break; | |
612 | case LPGETIRQ: | |
613 | if (copy_to_user(argp, &LP_IRQ(minor), | |
614 | sizeof(int))) | |
615 | return -EFAULT; | |
616 | break; | |
617 | case LPGETSTATUS: | |
618 | lp_claim_parport_or_block (&lp_table[minor]); | |
619 | status = r_str(minor); | |
620 | lp_release_parport (&lp_table[minor]); | |
621 | ||
622 | if (copy_to_user(argp, &status, sizeof(int))) | |
623 | return -EFAULT; | |
624 | break; | |
625 | case LPRESET: | |
626 | lp_reset(minor); | |
627 | break; | |
628 | #ifdef LP_STATS | |
629 | case LPGETSTATS: | |
630 | if (copy_to_user(argp, &LP_STAT(minor), | |
631 | sizeof(struct lp_stats))) | |
632 | return -EFAULT; | |
633 | if (capable(CAP_SYS_ADMIN)) | |
634 | memset(&LP_STAT(minor), 0, | |
635 | sizeof(struct lp_stats)); | |
636 | break; | |
637 | #endif | |
638 | case LPGETFLAGS: | |
639 | status = LP_F(minor); | |
640 | if (copy_to_user(argp, &status, sizeof(int))) | |
641 | return -EFAULT; | |
642 | break; | |
643 | ||
644 | case LPSETTIMEOUT: | |
645 | if (copy_from_user (&par_timeout, argp, | |
646 | sizeof (struct timeval))) { | |
647 | return -EFAULT; | |
648 | } | |
649 | /* Convert to jiffies, place in lp_table */ | |
650 | if ((par_timeout.tv_sec < 0) || | |
651 | (par_timeout.tv_usec < 0)) { | |
652 | return -EINVAL; | |
653 | } | |
654 | to_jiffies = ROUND_UP(par_timeout.tv_usec, 1000000/HZ); | |
655 | to_jiffies += par_timeout.tv_sec * (long) HZ; | |
656 | if (to_jiffies <= 0) { | |
657 | return -EINVAL; | |
658 | } | |
659 | lp_table[minor].timeout = to_jiffies; | |
660 | break; | |
661 | ||
662 | default: | |
663 | retval = -EINVAL; | |
664 | } | |
665 | return retval; | |
666 | } | |
667 | ||
62322d25 | 668 | static const struct file_operations lp_fops = { |
1da177e4 LT |
669 | .owner = THIS_MODULE, |
670 | .write = lp_write, | |
671 | .ioctl = lp_ioctl, | |
672 | .open = lp_open, | |
673 | .release = lp_release, | |
674 | #ifdef CONFIG_PARPORT_1284 | |
675 | .read = lp_read, | |
676 | #endif | |
677 | }; | |
678 | ||
679 | /* --- support for console on the line printer ----------------- */ | |
680 | ||
681 | #ifdef CONFIG_LP_CONSOLE | |
682 | ||
683 | #define CONSOLE_LP 0 | |
684 | ||
685 | /* If the printer is out of paper, we can either lose the messages or | |
686 | * stall until the printer is happy again. Define CONSOLE_LP_STRICT | |
687 | * non-zero to get the latter behaviour. */ | |
688 | #define CONSOLE_LP_STRICT 1 | |
689 | ||
690 | /* The console must be locked when we get here. */ | |
691 | ||
692 | static void lp_console_write (struct console *co, const char *s, | |
693 | unsigned count) | |
694 | { | |
695 | struct pardevice *dev = lp_table[CONSOLE_LP].dev; | |
696 | struct parport *port = dev->port; | |
697 | ssize_t written; | |
698 | ||
699 | if (parport_claim (dev)) | |
700 | /* Nothing we can do. */ | |
701 | return; | |
702 | ||
703 | parport_set_timeout (dev, 0); | |
704 | ||
705 | /* Go to compatibility mode. */ | |
706 | parport_negotiate (port, IEEE1284_MODE_COMPAT); | |
707 | ||
708 | do { | |
709 | /* Write the data, converting LF->CRLF as we go. */ | |
710 | ssize_t canwrite = count; | |
711 | char *lf = memchr (s, '\n', count); | |
712 | if (lf) | |
713 | canwrite = lf - s; | |
714 | ||
715 | if (canwrite > 0) { | |
716 | written = parport_write (port, s, canwrite); | |
717 | ||
718 | if (written <= 0) | |
719 | continue; | |
720 | ||
721 | s += written; | |
722 | count -= written; | |
723 | canwrite -= written; | |
724 | } | |
725 | ||
726 | if (lf && canwrite <= 0) { | |
727 | const char *crlf = "\r\n"; | |
728 | int i = 2; | |
729 | ||
730 | /* Dodge the original '\n', and put '\r\n' instead. */ | |
731 | s++; | |
732 | count--; | |
733 | do { | |
734 | written = parport_write (port, crlf, i); | |
735 | if (written > 0) | |
736 | i -= written, crlf += written; | |
737 | } while (i > 0 && (CONSOLE_LP_STRICT || written > 0)); | |
738 | } | |
739 | } while (count > 0 && (CONSOLE_LP_STRICT || written > 0)); | |
740 | ||
741 | parport_release (dev); | |
742 | } | |
743 | ||
744 | static struct console lpcons = { | |
745 | .name = "lp", | |
746 | .write = lp_console_write, | |
747 | .flags = CON_PRINTBUFFER, | |
748 | }; | |
749 | ||
750 | #endif /* console on line printer */ | |
751 | ||
752 | /* --- initialisation code ------------------------------------- */ | |
753 | ||
754 | static int parport_nr[LP_NO] = { [0 ... LP_NO-1] = LP_PARPORT_UNSPEC }; | |
755 | static char *parport[LP_NO] = { NULL, }; | |
756 | static int reset = 0; | |
757 | ||
758 | module_param_array(parport, charp, NULL, 0); | |
759 | module_param(reset, bool, 0); | |
760 | ||
761 | #ifndef MODULE | |
762 | static int __init lp_setup (char *str) | |
763 | { | |
764 | static int parport_ptr; // initially zero | |
765 | int x; | |
766 | ||
767 | if (get_option (&str, &x)) { | |
768 | if (x == 0) { | |
769 | /* disable driver on "lp=" or "lp=0" */ | |
770 | parport_nr[0] = LP_PARPORT_OFF; | |
771 | } else { | |
772 | printk(KERN_WARNING "warning: 'lp=0x%x' is deprecated, ignored\n", x); | |
773 | return 0; | |
774 | } | |
775 | } else if (!strncmp(str, "parport", 7)) { | |
776 | int n = simple_strtoul(str+7, NULL, 10); | |
777 | if (parport_ptr < LP_NO) | |
778 | parport_nr[parport_ptr++] = n; | |
779 | else | |
780 | printk(KERN_INFO "lp: too many ports, %s ignored.\n", | |
781 | str); | |
782 | } else if (!strcmp(str, "auto")) { | |
783 | parport_nr[0] = LP_PARPORT_AUTO; | |
784 | } else if (!strcmp(str, "none")) { | |
785 | parport_nr[parport_ptr++] = LP_PARPORT_NONE; | |
786 | } else if (!strcmp(str, "reset")) { | |
787 | reset = 1; | |
788 | } | |
789 | return 1; | |
790 | } | |
791 | #endif | |
792 | ||
793 | static int lp_register(int nr, struct parport *port) | |
794 | { | |
795 | lp_table[nr].dev = parport_register_device(port, "lp", | |
796 | lp_preempt, NULL, NULL, 0, | |
797 | (void *) &lp_table[nr]); | |
798 | if (lp_table[nr].dev == NULL) | |
799 | return 1; | |
800 | lp_table[nr].flags |= LP_EXIST; | |
801 | ||
802 | if (reset) | |
803 | lp_reset(nr); | |
804 | ||
da675296 | 805 | class_device_create(lp_class, NULL, MKDEV(LP_MAJOR, nr), port->dev, |
1da177e4 | 806 | "lp%d", nr); |
1da177e4 LT |
807 | |
808 | printk(KERN_INFO "lp%d: using %s (%s).\n", nr, port->name, | |
809 | (port->irq == PARPORT_IRQ_NONE)?"polling":"interrupt-driven"); | |
810 | ||
811 | #ifdef CONFIG_LP_CONSOLE | |
812 | if (!nr) { | |
813 | if (port->modes & PARPORT_MODE_SAFEININT) { | |
814 | register_console (&lpcons); | |
815 | console_registered = port; | |
816 | printk (KERN_INFO "lp%d: console ready\n", CONSOLE_LP); | |
817 | } else | |
818 | printk (KERN_ERR "lp%d: cannot run console on %s\n", | |
819 | CONSOLE_LP, port->name); | |
820 | } | |
821 | #endif | |
822 | ||
823 | return 0; | |
824 | } | |
825 | ||
826 | static void lp_attach (struct parport *port) | |
827 | { | |
828 | unsigned int i; | |
829 | ||
830 | switch (parport_nr[0]) | |
831 | { | |
832 | case LP_PARPORT_UNSPEC: | |
833 | case LP_PARPORT_AUTO: | |
834 | if (parport_nr[0] == LP_PARPORT_AUTO && | |
835 | port->probe_info[0].class != PARPORT_CLASS_PRINTER) | |
836 | return; | |
837 | if (lp_count == LP_NO) { | |
838 | printk(KERN_INFO "lp: ignoring parallel port (max. %d)\n",LP_NO); | |
839 | return; | |
840 | } | |
841 | if (!lp_register(lp_count, port)) | |
842 | lp_count++; | |
843 | break; | |
844 | ||
845 | default: | |
846 | for (i = 0; i < LP_NO; i++) { | |
847 | if (port->number == parport_nr[i]) { | |
848 | if (!lp_register(i, port)) | |
849 | lp_count++; | |
850 | break; | |
851 | } | |
852 | } | |
853 | break; | |
854 | } | |
855 | } | |
856 | ||
857 | static void lp_detach (struct parport *port) | |
858 | { | |
859 | /* Write this some day. */ | |
860 | #ifdef CONFIG_LP_CONSOLE | |
861 | if (console_registered == port) { | |
862 | unregister_console (&lpcons); | |
863 | console_registered = NULL; | |
864 | } | |
865 | #endif /* CONFIG_LP_CONSOLE */ | |
866 | } | |
867 | ||
868 | static struct parport_driver lp_driver = { | |
869 | .name = "lp", | |
870 | .attach = lp_attach, | |
871 | .detach = lp_detach, | |
872 | }; | |
873 | ||
874 | static int __init lp_init (void) | |
875 | { | |
876 | int i, err = 0; | |
877 | ||
878 | if (parport_nr[0] == LP_PARPORT_OFF) | |
879 | return 0; | |
880 | ||
881 | for (i = 0; i < LP_NO; i++) { | |
882 | lp_table[i].dev = NULL; | |
883 | lp_table[i].flags = 0; | |
884 | lp_table[i].chars = LP_INIT_CHAR; | |
885 | lp_table[i].time = LP_INIT_TIME; | |
886 | lp_table[i].wait = LP_INIT_WAIT; | |
887 | lp_table[i].lp_buffer = NULL; | |
888 | #ifdef LP_STATS | |
889 | lp_table[i].lastcall = 0; | |
890 | lp_table[i].runchars = 0; | |
891 | memset (&lp_table[i].stats, 0, sizeof (struct lp_stats)); | |
892 | #endif | |
893 | lp_table[i].last_error = 0; | |
894 | init_waitqueue_head (&lp_table[i].waitq); | |
895 | init_waitqueue_head (&lp_table[i].dataq); | |
896 | init_MUTEX (&lp_table[i].port_mutex); | |
897 | lp_table[i].timeout = 10 * HZ; | |
898 | } | |
899 | ||
900 | if (register_chrdev (LP_MAJOR, "lp", &lp_fops)) { | |
901 | printk (KERN_ERR "lp: unable to get major %d\n", LP_MAJOR); | |
902 | return -EIO; | |
903 | } | |
904 | ||
ca8eca68 | 905 | lp_class = class_create(THIS_MODULE, "printer"); |
1da177e4 LT |
906 | if (IS_ERR(lp_class)) { |
907 | err = PTR_ERR(lp_class); | |
d09d7ddf | 908 | goto out_reg; |
1da177e4 LT |
909 | } |
910 | ||
911 | if (parport_register_driver (&lp_driver)) { | |
912 | printk (KERN_ERR "lp: unable to register with parport\n"); | |
913 | err = -EIO; | |
914 | goto out_class; | |
915 | } | |
916 | ||
917 | if (!lp_count) { | |
918 | printk (KERN_INFO "lp: driver loaded but no devices found\n"); | |
919 | #ifndef CONFIG_PARPORT_1284 | |
920 | if (parport_nr[0] == LP_PARPORT_AUTO) | |
921 | printk (KERN_INFO "lp: (is IEEE 1284 support enabled?)\n"); | |
922 | #endif | |
923 | } | |
924 | ||
925 | return 0; | |
926 | ||
927 | out_class: | |
ca8eca68 | 928 | class_destroy(lp_class); |
d09d7ddf | 929 | out_reg: |
1da177e4 LT |
930 | unregister_chrdev(LP_MAJOR, "lp"); |
931 | return err; | |
932 | } | |
933 | ||
934 | static int __init lp_init_module (void) | |
935 | { | |
936 | if (parport[0]) { | |
937 | /* The user gave some parameters. Let's see what they were. */ | |
938 | if (!strncmp(parport[0], "auto", 4)) | |
939 | parport_nr[0] = LP_PARPORT_AUTO; | |
940 | else { | |
941 | int n; | |
942 | for (n = 0; n < LP_NO && parport[n]; n++) { | |
943 | if (!strncmp(parport[n], "none", 4)) | |
944 | parport_nr[n] = LP_PARPORT_NONE; | |
945 | else { | |
946 | char *ep; | |
947 | unsigned long r = simple_strtoul(parport[n], &ep, 0); | |
948 | if (ep != parport[n]) | |
949 | parport_nr[n] = r; | |
950 | else { | |
951 | printk(KERN_ERR "lp: bad port specifier `%s'\n", parport[n]); | |
952 | return -ENODEV; | |
953 | } | |
954 | } | |
955 | } | |
956 | } | |
957 | } | |
958 | ||
959 | return lp_init(); | |
960 | } | |
961 | ||
962 | static void lp_cleanup_module (void) | |
963 | { | |
964 | unsigned int offset; | |
965 | ||
966 | parport_unregister_driver (&lp_driver); | |
967 | ||
968 | #ifdef CONFIG_LP_CONSOLE | |
969 | unregister_console (&lpcons); | |
970 | #endif | |
971 | ||
972 | unregister_chrdev(LP_MAJOR, "lp"); | |
973 | for (offset = 0; offset < LP_NO; offset++) { | |
974 | if (lp_table[offset].dev == NULL) | |
975 | continue; | |
976 | parport_unregister_device(lp_table[offset].dev); | |
ca8eca68 | 977 | class_device_destroy(lp_class, MKDEV(LP_MAJOR, offset)); |
1da177e4 | 978 | } |
ca8eca68 | 979 | class_destroy(lp_class); |
1da177e4 LT |
980 | } |
981 | ||
982 | __setup("lp=", lp_setup); | |
983 | module_init(lp_init_module); | |
984 | module_exit(lp_cleanup_module); | |
985 | ||
986 | MODULE_ALIAS_CHARDEV_MAJOR(LP_MAJOR); | |
987 | MODULE_LICENSE("GPL"); |