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1da177e4 LT |
1 | /* r3964 linediscipline for linux |
2 | * | |
3 | * ----------------------------------------------------------- | |
4 | * Copyright by | |
5 | * Philips Automation Projects | |
6 | * Kassel (Germany) | |
7 | * http://www.pap-philips.de | |
8 | * ----------------------------------------------------------- | |
9 | * This software may be used and distributed according to the terms of | |
10 | * the GNU General Public License, incorporated herein by reference. | |
11 | * | |
12 | * Author: | |
13 | * L. Haag | |
14 | * | |
15 | * $Log: n_r3964.c,v $ | |
16 | * Revision 1.10 2001/03/18 13:02:24 dwmw2 | |
17 | * Fix timer usage, use spinlocks properly. | |
18 | * | |
19 | * Revision 1.9 2001/03/18 12:52:14 dwmw2 | |
20 | * Merge changes in 2.4.2 | |
21 | * | |
22 | * Revision 1.8 2000/03/23 14:14:54 dwmw2 | |
23 | * Fix race in sleeping in r3964_read() | |
24 | * | |
25 | * Revision 1.7 1999/28/08 11:41:50 dwmw2 | |
26 | * Port to 2.3 kernel | |
27 | * | |
28 | * Revision 1.6 1998/09/30 00:40:40 dwmw2 | |
29 | * Fixed compilation on 2.0.x kernels | |
30 | * Updated to newly registered tty-ldisc number 9 | |
31 | * | |
32 | * Revision 1.5 1998/09/04 21:57:36 dwmw2 | |
33 | * Signal handling bug fixes, port to 2.1.x. | |
34 | * | |
35 | * Revision 1.4 1998/04/02 20:26:59 lhaag | |
36 | * select, blocking, ... | |
37 | * | |
38 | * Revision 1.3 1998/02/12 18:58:43 root | |
39 | * fixed some memory leaks | |
40 | * calculation of checksum characters | |
41 | * | |
42 | * Revision 1.2 1998/02/07 13:03:34 root | |
43 | * ioctl read_telegram | |
44 | * | |
45 | * Revision 1.1 1998/02/06 19:21:03 root | |
46 | * Initial revision | |
47 | * | |
48 | * | |
49 | */ | |
50 | ||
51 | #include <linux/module.h> | |
52 | #include <linux/kernel.h> | |
53 | #include <linux/sched.h> | |
54 | #include <linux/types.h> | |
55 | #include <linux/fcntl.h> | |
56 | #include <linux/interrupt.h> | |
57 | #include <linux/ptrace.h> | |
58 | #include <linux/ioport.h> | |
59 | #include <linux/in.h> | |
60 | #include <linux/slab.h> | |
61 | #include <linux/tty.h> | |
62 | #include <linux/errno.h> | |
63 | #include <linux/string.h> /* used in new tty drivers */ | |
64 | #include <linux/signal.h> /* used in new tty drivers */ | |
65 | #include <linux/ioctl.h> | |
66 | #include <linux/n_r3964.h> | |
67 | #include <linux/poll.h> | |
68 | #include <linux/init.h> | |
69 | #include <asm/uaccess.h> | |
70 | ||
71 | ||
72 | //#define DEBUG_QUEUE | |
73 | ||
74 | /* Log successful handshake and protocol operations */ | |
75 | //#define DEBUG_PROTO_S | |
76 | ||
77 | /* Log handshake and protocol errors: */ | |
78 | //#define DEBUG_PROTO_E | |
79 | ||
80 | /* Log Linediscipline operations (open, close, read, write...): */ | |
81 | //#define DEBUG_LDISC | |
82 | ||
83 | /* Log module and memory operations (init, cleanup; kmalloc, kfree): */ | |
84 | //#define DEBUG_MODUL | |
85 | ||
86 | /* Macro helpers for debug output: */ | |
87 | #define TRACE(format, args...) printk("r3964: " format "\n" , ## args); | |
88 | ||
89 | #ifdef DEBUG_MODUL | |
90 | #define TRACE_M(format, args...) printk("r3964: " format "\n" , ## args); | |
91 | #else | |
92 | #define TRACE_M(fmt, arg...) /**/ | |
93 | #endif | |
94 | ||
95 | #ifdef DEBUG_PROTO_S | |
96 | #define TRACE_PS(format, args...) printk("r3964: " format "\n" , ## args); | |
97 | #else | |
98 | #define TRACE_PS(fmt, arg...) /**/ | |
99 | #endif | |
100 | ||
101 | #ifdef DEBUG_PROTO_E | |
102 | #define TRACE_PE(format, args...) printk("r3964: " format "\n" , ## args); | |
103 | #else | |
104 | #define TRACE_PE(fmt, arg...) /**/ | |
105 | #endif | |
106 | ||
107 | #ifdef DEBUG_LDISC | |
108 | #define TRACE_L(format, args...) printk("r3964: " format "\n" , ## args); | |
109 | #else | |
110 | #define TRACE_L(fmt, arg...) /**/ | |
111 | #endif | |
112 | ||
113 | #ifdef DEBUG_QUEUE | |
114 | #define TRACE_Q(format, args...) printk("r3964: " format "\n" , ## args); | |
115 | #else | |
116 | #define TRACE_Q(fmt, arg...) /**/ | |
117 | #endif | |
118 | ||
119 | static void add_tx_queue(struct r3964_info *, struct r3964_block_header *); | |
120 | static void remove_from_tx_queue(struct r3964_info *pInfo, int error_code); | |
121 | static void put_char(struct r3964_info *pInfo, unsigned char ch); | |
122 | static void trigger_transmit(struct r3964_info *pInfo); | |
123 | static void retry_transmit(struct r3964_info *pInfo); | |
124 | static void transmit_block(struct r3964_info *pInfo); | |
125 | static void receive_char(struct r3964_info *pInfo, const unsigned char c); | |
126 | static void receive_error(struct r3964_info *pInfo, const char flag); | |
127 | static void on_timeout(unsigned long priv); | |
128 | static int enable_signals(struct r3964_info *pInfo, pid_t pid, int arg); | |
129 | static int read_telegram(struct r3964_info *pInfo, pid_t pid, unsigned char __user *buf); | |
130 | static void add_msg(struct r3964_client_info *pClient, int msg_id, int arg, | |
131 | int error_code, struct r3964_block_header *pBlock); | |
132 | static struct r3964_message* remove_msg(struct r3964_info *pInfo, | |
133 | struct r3964_client_info *pClient); | |
134 | static void remove_client_block(struct r3964_info *pInfo, | |
135 | struct r3964_client_info *pClient); | |
136 | ||
137 | static int r3964_open(struct tty_struct *tty); | |
138 | static void r3964_close(struct tty_struct *tty); | |
139 | static ssize_t r3964_read(struct tty_struct *tty, struct file *file, | |
140 | unsigned char __user *buf, size_t nr); | |
141 | static ssize_t r3964_write(struct tty_struct * tty, struct file * file, | |
142 | const unsigned char * buf, size_t nr); | |
143 | static int r3964_ioctl(struct tty_struct * tty, struct file * file, | |
144 | unsigned int cmd, unsigned long arg); | |
145 | static void r3964_set_termios(struct tty_struct *tty, struct termios * old); | |
146 | static unsigned int r3964_poll(struct tty_struct * tty, struct file * file, | |
147 | struct poll_table_struct *wait); | |
148 | static void r3964_receive_buf(struct tty_struct *tty, const unsigned char *cp, | |
149 | char *fp, int count); | |
150 | static int r3964_receive_room(struct tty_struct *tty); | |
151 | ||
152 | static struct tty_ldisc tty_ldisc_N_R3964 = { | |
153 | .owner = THIS_MODULE, | |
154 | .magic = TTY_LDISC_MAGIC, | |
155 | .name = "R3964", | |
156 | .open = r3964_open, | |
157 | .close = r3964_close, | |
158 | .read = r3964_read, | |
159 | .write = r3964_write, | |
160 | .ioctl = r3964_ioctl, | |
161 | .set_termios = r3964_set_termios, | |
162 | .poll = r3964_poll, | |
163 | .receive_buf = r3964_receive_buf, | |
164 | .receive_room = r3964_receive_room, | |
165 | }; | |
166 | ||
167 | ||
168 | ||
169 | static void dump_block(const unsigned char *block, unsigned int length) | |
170 | { | |
171 | unsigned int i,j; | |
172 | char linebuf[16*3+1]; | |
173 | ||
174 | for(i=0;i<length;i+=16) | |
175 | { | |
176 | for(j=0;(j<16) && (j+i<length);j++) | |
177 | { | |
178 | sprintf(linebuf+3*j,"%02x ",block[i+j]); | |
179 | } | |
180 | linebuf[3*j]='\0'; | |
181 | TRACE_PS("%s",linebuf); | |
182 | } | |
183 | } | |
184 | ||
185 | ||
186 | ||
187 | ||
188 | /************************************************************* | |
189 | * Driver initialisation | |
190 | *************************************************************/ | |
191 | ||
192 | ||
193 | /************************************************************* | |
194 | * Module support routines | |
195 | *************************************************************/ | |
196 | ||
197 | static void __exit r3964_exit(void) | |
198 | { | |
199 | int status; | |
200 | ||
201 | TRACE_M ("cleanup_module()"); | |
202 | ||
64ccd715 | 203 | status=tty_unregister_ldisc(N_R3964); |
1da177e4 LT |
204 | |
205 | if(status!=0) | |
206 | { | |
207 | printk(KERN_ERR "r3964: error unregistering linediscipline: %d\n", status); | |
208 | } | |
209 | else | |
210 | { | |
211 | TRACE_L("linediscipline successfully unregistered"); | |
212 | } | |
213 | ||
214 | } | |
215 | ||
216 | static int __init r3964_init(void) | |
217 | { | |
218 | int status; | |
219 | ||
220 | printk ("r3964: Philips r3964 Driver $Revision: 1.10 $\n"); | |
221 | ||
222 | /* | |
223 | * Register the tty line discipline | |
224 | */ | |
225 | ||
226 | status = tty_register_ldisc (N_R3964, &tty_ldisc_N_R3964); | |
227 | if (status == 0) | |
228 | { | |
229 | TRACE_L("line discipline %d registered", N_R3964); | |
230 | TRACE_L("flags=%x num=%x", tty_ldisc_N_R3964.flags, | |
231 | tty_ldisc_N_R3964.num); | |
87e0f3db AD |
232 | TRACE_L("open=%p", tty_ldisc_N_R3964.open); |
233 | TRACE_L("tty_ldisc_N_R3964 = %p", &tty_ldisc_N_R3964); | |
1da177e4 LT |
234 | } |
235 | else | |
236 | { | |
237 | printk (KERN_ERR "r3964: error registering line discipline: %d\n", status); | |
238 | } | |
239 | return status; | |
240 | } | |
241 | ||
242 | module_init(r3964_init); | |
243 | module_exit(r3964_exit); | |
244 | ||
245 | ||
246 | /************************************************************* | |
247 | * Protocol implementation routines | |
248 | *************************************************************/ | |
249 | ||
250 | static void add_tx_queue(struct r3964_info *pInfo, struct r3964_block_header *pHeader) | |
251 | { | |
252 | unsigned long flags; | |
253 | ||
254 | spin_lock_irqsave(&pInfo->lock, flags); | |
255 | ||
256 | pHeader->next = NULL; | |
257 | ||
258 | if(pInfo->tx_last == NULL) | |
259 | { | |
260 | pInfo->tx_first = pInfo->tx_last = pHeader; | |
261 | } | |
262 | else | |
263 | { | |
264 | pInfo->tx_last->next = pHeader; | |
265 | pInfo->tx_last = pHeader; | |
266 | } | |
267 | ||
268 | spin_unlock_irqrestore(&pInfo->lock, flags); | |
269 | ||
87e0f3db AD |
270 | TRACE_Q("add_tx_queue %p, length %d, tx_first = %p", |
271 | pHeader, pHeader->length, pInfo->tx_first ); | |
1da177e4 LT |
272 | } |
273 | ||
274 | static void remove_from_tx_queue(struct r3964_info *pInfo, int error_code) | |
275 | { | |
276 | struct r3964_block_header *pHeader; | |
277 | unsigned long flags; | |
278 | #ifdef DEBUG_QUEUE | |
279 | struct r3964_block_header *pDump; | |
280 | #endif | |
281 | ||
282 | pHeader = pInfo->tx_first; | |
283 | ||
284 | if(pHeader==NULL) | |
285 | return; | |
286 | ||
287 | #ifdef DEBUG_QUEUE | |
87e0f3db AD |
288 | printk("r3964: remove_from_tx_queue: %p, length %u - ", |
289 | pHeader, pHeader->length ); | |
1da177e4 | 290 | for(pDump=pHeader;pDump;pDump=pDump->next) |
87e0f3db | 291 | printk("%p ", pDump); |
1da177e4 LT |
292 | printk("\n"); |
293 | #endif | |
294 | ||
295 | ||
296 | if(pHeader->owner) | |
297 | { | |
298 | if(error_code) | |
299 | { | |
300 | add_msg(pHeader->owner, R3964_MSG_ACK, 0, | |
301 | error_code, NULL); | |
302 | } | |
303 | else | |
304 | { | |
305 | add_msg(pHeader->owner, R3964_MSG_ACK, pHeader->length, | |
306 | error_code, NULL); | |
307 | } | |
308 | wake_up_interruptible (&pInfo->read_wait); | |
309 | } | |
310 | ||
311 | spin_lock_irqsave(&pInfo->lock, flags); | |
312 | ||
313 | pInfo->tx_first = pHeader->next; | |
314 | if(pInfo->tx_first==NULL) | |
315 | { | |
316 | pInfo->tx_last = NULL; | |
317 | } | |
318 | ||
319 | spin_unlock_irqrestore(&pInfo->lock, flags); | |
320 | ||
321 | kfree(pHeader); | |
87e0f3db | 322 | TRACE_M("remove_from_tx_queue - kfree %p",pHeader); |
1da177e4 | 323 | |
87e0f3db AD |
324 | TRACE_Q("remove_from_tx_queue: tx_first = %p, tx_last = %p", |
325 | pInfo->tx_first, pInfo->tx_last ); | |
1da177e4 LT |
326 | } |
327 | ||
328 | static void add_rx_queue(struct r3964_info *pInfo, struct r3964_block_header *pHeader) | |
329 | { | |
330 | unsigned long flags; | |
331 | ||
332 | spin_lock_irqsave(&pInfo->lock, flags); | |
333 | ||
334 | pHeader->next = NULL; | |
335 | ||
336 | if(pInfo->rx_last == NULL) | |
337 | { | |
338 | pInfo->rx_first = pInfo->rx_last = pHeader; | |
339 | } | |
340 | else | |
341 | { | |
342 | pInfo->rx_last->next = pHeader; | |
343 | pInfo->rx_last = pHeader; | |
344 | } | |
345 | pInfo->blocks_in_rx_queue++; | |
346 | ||
347 | spin_unlock_irqrestore(&pInfo->lock, flags); | |
348 | ||
87e0f3db AD |
349 | TRACE_Q("add_rx_queue: %p, length = %d, rx_first = %p, count = %d", |
350 | pHeader, pHeader->length, | |
351 | pInfo->rx_first, pInfo->blocks_in_rx_queue); | |
1da177e4 LT |
352 | } |
353 | ||
354 | static void remove_from_rx_queue(struct r3964_info *pInfo, | |
355 | struct r3964_block_header *pHeader) | |
356 | { | |
357 | unsigned long flags; | |
358 | struct r3964_block_header *pFind; | |
359 | ||
360 | if(pHeader==NULL) | |
361 | return; | |
362 | ||
87e0f3db AD |
363 | TRACE_Q("remove_from_rx_queue: rx_first = %p, rx_last = %p, count = %d", |
364 | pInfo->rx_first, pInfo->rx_last, pInfo->blocks_in_rx_queue ); | |
365 | TRACE_Q("remove_from_rx_queue: %p, length %u", | |
366 | pHeader, pHeader->length ); | |
1da177e4 LT |
367 | |
368 | spin_lock_irqsave(&pInfo->lock, flags); | |
369 | ||
370 | if(pInfo->rx_first == pHeader) | |
371 | { | |
372 | /* Remove the first block in the linked list: */ | |
373 | pInfo->rx_first = pHeader->next; | |
374 | ||
375 | if(pInfo->rx_first==NULL) | |
376 | { | |
377 | pInfo->rx_last = NULL; | |
378 | } | |
379 | pInfo->blocks_in_rx_queue--; | |
380 | } | |
381 | else | |
382 | { | |
383 | /* Find block to remove: */ | |
384 | for(pFind=pInfo->rx_first; pFind; pFind=pFind->next) | |
385 | { | |
386 | if(pFind->next == pHeader) | |
387 | { | |
388 | /* Got it. */ | |
389 | pFind->next = pHeader->next; | |
390 | pInfo->blocks_in_rx_queue--; | |
391 | if(pFind->next==NULL) | |
392 | { | |
393 | /* Oh, removed the last one! */ | |
394 | pInfo->rx_last = pFind; | |
395 | } | |
396 | break; | |
397 | } | |
398 | } | |
399 | } | |
400 | ||
401 | spin_unlock_irqrestore(&pInfo->lock, flags); | |
402 | ||
403 | kfree(pHeader); | |
87e0f3db | 404 | TRACE_M("remove_from_rx_queue - kfree %p",pHeader); |
1da177e4 | 405 | |
87e0f3db AD |
406 | TRACE_Q("remove_from_rx_queue: rx_first = %p, rx_last = %p, count = %d", |
407 | pInfo->rx_first, pInfo->rx_last, pInfo->blocks_in_rx_queue ); | |
1da177e4 LT |
408 | } |
409 | ||
410 | static void put_char(struct r3964_info *pInfo, unsigned char ch) | |
411 | { | |
412 | struct tty_struct *tty = pInfo->tty; | |
413 | ||
414 | if(tty==NULL) | |
415 | return; | |
416 | ||
417 | if(tty->driver->put_char) | |
418 | { | |
419 | tty->driver->put_char(tty, ch); | |
420 | } | |
421 | pInfo->bcc ^= ch; | |
422 | } | |
423 | ||
424 | static void flush(struct r3964_info *pInfo) | |
425 | { | |
426 | struct tty_struct *tty = pInfo->tty; | |
427 | ||
428 | if(tty==NULL) | |
429 | return; | |
430 | ||
431 | if(tty->driver->flush_chars) | |
432 | { | |
433 | tty->driver->flush_chars(tty); | |
434 | } | |
435 | } | |
436 | ||
437 | static void trigger_transmit(struct r3964_info *pInfo) | |
438 | { | |
439 | unsigned long flags; | |
440 | ||
441 | ||
442 | spin_lock_irqsave(&pInfo->lock, flags); | |
443 | ||
444 | if((pInfo->state == R3964_IDLE) && (pInfo->tx_first!=NULL)) | |
445 | { | |
446 | pInfo->state = R3964_TX_REQUEST; | |
447 | pInfo->nRetry=0; | |
448 | pInfo->flags &= ~R3964_ERROR; | |
449 | mod_timer(&pInfo->tmr, jiffies + R3964_TO_QVZ); | |
450 | ||
451 | spin_unlock_irqrestore(&pInfo->lock, flags); | |
452 | ||
453 | TRACE_PS("trigger_transmit - sent STX"); | |
454 | ||
455 | put_char(pInfo, STX); | |
456 | flush(pInfo); | |
457 | ||
458 | pInfo->bcc = 0; | |
459 | } | |
460 | else | |
461 | { | |
462 | spin_unlock_irqrestore(&pInfo->lock, flags); | |
463 | } | |
464 | } | |
465 | ||
466 | static void retry_transmit(struct r3964_info *pInfo) | |
467 | { | |
468 | if(pInfo->nRetry<R3964_MAX_RETRIES) | |
469 | { | |
470 | TRACE_PE("transmission failed. Retry #%d", | |
471 | pInfo->nRetry); | |
472 | pInfo->bcc = 0; | |
473 | put_char(pInfo, STX); | |
474 | flush(pInfo); | |
475 | pInfo->state = R3964_TX_REQUEST; | |
476 | pInfo->nRetry++; | |
477 | mod_timer(&pInfo->tmr, jiffies + R3964_TO_QVZ); | |
478 | } | |
479 | else | |
480 | { | |
481 | TRACE_PE("transmission failed after %d retries", | |
482 | R3964_MAX_RETRIES); | |
483 | ||
484 | remove_from_tx_queue(pInfo, R3964_TX_FAIL); | |
485 | ||
486 | put_char(pInfo, NAK); | |
487 | flush(pInfo); | |
488 | pInfo->state = R3964_IDLE; | |
489 | ||
490 | trigger_transmit(pInfo); | |
491 | } | |
492 | } | |
493 | ||
494 | ||
495 | static void transmit_block(struct r3964_info *pInfo) | |
496 | { | |
497 | struct tty_struct *tty = pInfo->tty; | |
498 | struct r3964_block_header *pBlock = pInfo->tx_first; | |
499 | int room=0; | |
500 | ||
501 | if((tty==NULL) || (pBlock==NULL)) | |
502 | { | |
503 | return; | |
504 | } | |
505 | ||
506 | if(tty->driver->write_room) | |
507 | room=tty->driver->write_room(tty); | |
508 | ||
87e0f3db AD |
509 | TRACE_PS("transmit_block %p, room %d, length %d", |
510 | pBlock, room, pBlock->length); | |
1da177e4 LT |
511 | |
512 | while(pInfo->tx_position < pBlock->length) | |
513 | { | |
514 | if(room<2) | |
515 | break; | |
516 | ||
517 | if(pBlock->data[pInfo->tx_position]==DLE) | |
518 | { | |
519 | /* send additional DLE char: */ | |
520 | put_char(pInfo, DLE); | |
521 | } | |
522 | put_char(pInfo, pBlock->data[pInfo->tx_position++]); | |
523 | ||
524 | room--; | |
525 | } | |
526 | ||
527 | if((pInfo->tx_position == pBlock->length) && (room>=3)) | |
528 | { | |
529 | put_char(pInfo, DLE); | |
530 | put_char(pInfo, ETX); | |
531 | if(pInfo->flags & R3964_BCC) | |
532 | { | |
533 | put_char(pInfo, pInfo->bcc); | |
534 | } | |
535 | pInfo->state = R3964_WAIT_FOR_TX_ACK; | |
536 | mod_timer(&pInfo->tmr, jiffies + R3964_TO_QVZ); | |
537 | } | |
538 | flush(pInfo); | |
539 | } | |
540 | ||
541 | static void on_receive_block(struct r3964_info *pInfo) | |
542 | { | |
543 | unsigned int length; | |
544 | struct r3964_client_info *pClient; | |
545 | struct r3964_block_header *pBlock; | |
546 | ||
547 | length=pInfo->rx_position; | |
548 | ||
549 | /* compare byte checksum characters: */ | |
550 | if(pInfo->flags & R3964_BCC) | |
551 | { | |
552 | if(pInfo->bcc!=pInfo->last_rx) | |
553 | { | |
554 | TRACE_PE("checksum error - got %x but expected %x", | |
555 | pInfo->last_rx, pInfo->bcc); | |
556 | pInfo->flags |= R3964_CHECKSUM; | |
557 | } | |
558 | } | |
559 | ||
560 | /* check for errors (parity, overrun,...): */ | |
561 | if(pInfo->flags & R3964_ERROR) | |
562 | { | |
563 | TRACE_PE("on_receive_block - transmission failed error %x", | |
564 | pInfo->flags & R3964_ERROR); | |
565 | ||
566 | put_char(pInfo, NAK); | |
567 | flush(pInfo); | |
568 | if(pInfo->nRetry<R3964_MAX_RETRIES) | |
569 | { | |
570 | pInfo->state=R3964_WAIT_FOR_RX_REPEAT; | |
571 | pInfo->nRetry++; | |
572 | mod_timer(&pInfo->tmr, jiffies + R3964_TO_RX_PANIC); | |
573 | } | |
574 | else | |
575 | { | |
576 | TRACE_PE("on_receive_block - failed after max retries"); | |
577 | pInfo->state=R3964_IDLE; | |
578 | } | |
579 | return; | |
580 | } | |
581 | ||
582 | ||
583 | /* received block; submit DLE: */ | |
584 | put_char(pInfo, DLE); | |
585 | flush(pInfo); | |
586 | del_timer_sync(&pInfo->tmr); | |
587 | TRACE_PS(" rx success: got %d chars", length); | |
588 | ||
589 | /* prepare struct r3964_block_header: */ | |
590 | pBlock = kmalloc(length+sizeof(struct r3964_block_header), GFP_KERNEL); | |
87e0f3db | 591 | TRACE_M("on_receive_block - kmalloc %p",pBlock); |
1da177e4 LT |
592 | |
593 | if(pBlock==NULL) | |
594 | return; | |
595 | ||
596 | pBlock->length = length; | |
597 | pBlock->data = ((unsigned char*)pBlock)+sizeof(struct r3964_block_header); | |
598 | pBlock->locks = 0; | |
599 | pBlock->next = NULL; | |
600 | pBlock->owner = NULL; | |
601 | ||
602 | memcpy(pBlock->data, pInfo->rx_buf, length); | |
603 | ||
604 | /* queue block into rx_queue: */ | |
605 | add_rx_queue(pInfo, pBlock); | |
606 | ||
607 | /* notify attached client processes: */ | |
608 | for(pClient=pInfo->firstClient; pClient; pClient=pClient->next) | |
609 | { | |
610 | if(pClient->sig_flags & R3964_SIG_DATA) | |
611 | { | |
612 | add_msg(pClient, R3964_MSG_DATA, length, R3964_OK, pBlock); | |
613 | } | |
614 | } | |
615 | wake_up_interruptible (&pInfo->read_wait); | |
616 | ||
617 | pInfo->state = R3964_IDLE; | |
618 | ||
619 | trigger_transmit(pInfo); | |
620 | } | |
621 | ||
622 | ||
623 | static void receive_char(struct r3964_info *pInfo, const unsigned char c) | |
624 | { | |
625 | switch(pInfo->state) | |
626 | { | |
627 | case R3964_TX_REQUEST: | |
628 | if(c==DLE) | |
629 | { | |
630 | TRACE_PS("TX_REQUEST - got DLE"); | |
631 | ||
632 | pInfo->state = R3964_TRANSMITTING; | |
633 | pInfo->tx_position = 0; | |
634 | ||
635 | transmit_block(pInfo); | |
636 | } | |
637 | else if(c==STX) | |
638 | { | |
639 | if(pInfo->nRetry==0) | |
640 | { | |
641 | TRACE_PE("TX_REQUEST - init conflict"); | |
642 | if(pInfo->priority == R3964_SLAVE) | |
643 | { | |
644 | goto start_receiving; | |
645 | } | |
646 | } | |
647 | else | |
648 | { | |
649 | TRACE_PE("TX_REQUEST - secondary init conflict!?" | |
650 | " Switching to SLAVE mode for next rx."); | |
651 | goto start_receiving; | |
652 | } | |
653 | } | |
654 | else | |
655 | { | |
656 | TRACE_PE("TX_REQUEST - char != DLE: %x", c); | |
657 | retry_transmit(pInfo); | |
658 | } | |
659 | break; | |
660 | case R3964_TRANSMITTING: | |
661 | if(c==NAK) | |
662 | { | |
663 | TRACE_PE("TRANSMITTING - got NAK"); | |
664 | retry_transmit(pInfo); | |
665 | } | |
666 | else | |
667 | { | |
668 | TRACE_PE("TRANSMITTING - got invalid char"); | |
669 | ||
670 | pInfo->state = R3964_WAIT_ZVZ_BEFORE_TX_RETRY; | |
671 | mod_timer(&pInfo->tmr, jiffies + R3964_TO_ZVZ); | |
672 | } | |
673 | break; | |
674 | case R3964_WAIT_FOR_TX_ACK: | |
675 | if(c==DLE) | |
676 | { | |
677 | TRACE_PS("WAIT_FOR_TX_ACK - got DLE"); | |
678 | remove_from_tx_queue(pInfo, R3964_OK); | |
679 | ||
680 | pInfo->state = R3964_IDLE; | |
681 | trigger_transmit(pInfo); | |
682 | } | |
683 | else | |
684 | { | |
685 | retry_transmit(pInfo); | |
686 | } | |
687 | break; | |
688 | case R3964_WAIT_FOR_RX_REPEAT: | |
689 | /* FALLTROUGH */ | |
690 | case R3964_IDLE: | |
691 | if(c==STX) | |
692 | { | |
693 | /* Prevent rx_queue from overflow: */ | |
694 | if(pInfo->blocks_in_rx_queue >= R3964_MAX_BLOCKS_IN_RX_QUEUE) | |
695 | { | |
696 | TRACE_PE("IDLE - got STX but no space in rx_queue!"); | |
697 | pInfo->state=R3964_WAIT_FOR_RX_BUF; | |
698 | mod_timer(&pInfo->tmr, R3964_TO_NO_BUF); | |
699 | break; | |
700 | } | |
701 | start_receiving: | |
702 | /* Ok, start receiving: */ | |
703 | TRACE_PS("IDLE - got STX"); | |
704 | pInfo->rx_position = 0; | |
705 | pInfo->last_rx = 0; | |
706 | pInfo->flags &= ~R3964_ERROR; | |
707 | pInfo->state=R3964_RECEIVING; | |
708 | mod_timer(&pInfo->tmr, R3964_TO_ZVZ); | |
709 | pInfo->nRetry = 0; | |
710 | put_char(pInfo, DLE); | |
711 | flush(pInfo); | |
712 | pInfo->bcc = 0; | |
713 | } | |
714 | break; | |
715 | case R3964_RECEIVING: | |
716 | if(pInfo->rx_position < RX_BUF_SIZE) | |
717 | { | |
718 | pInfo->bcc ^= c; | |
719 | ||
720 | if(c==DLE) | |
721 | { | |
722 | if(pInfo->last_rx==DLE) | |
723 | { | |
724 | pInfo->last_rx = 0; | |
725 | goto char_to_buf; | |
726 | } | |
727 | pInfo->last_rx = DLE; | |
728 | break; | |
729 | } | |
730 | else if((c==ETX) && (pInfo->last_rx==DLE)) | |
731 | { | |
732 | if(pInfo->flags & R3964_BCC) | |
733 | { | |
734 | pInfo->state = R3964_WAIT_FOR_BCC; | |
735 | mod_timer(&pInfo->tmr, R3964_TO_ZVZ); | |
736 | } | |
737 | else | |
738 | { | |
739 | on_receive_block(pInfo); | |
740 | } | |
741 | } | |
742 | else | |
743 | { | |
744 | pInfo->last_rx = c; | |
745 | char_to_buf: | |
746 | pInfo->rx_buf[pInfo->rx_position++] = c; | |
747 | mod_timer(&pInfo->tmr, R3964_TO_ZVZ); | |
748 | } | |
749 | } | |
750 | /* else: overflow-msg? BUF_SIZE>MTU; should not happen? */ | |
751 | break; | |
752 | case R3964_WAIT_FOR_BCC: | |
753 | pInfo->last_rx = c; | |
754 | on_receive_block(pInfo); | |
755 | break; | |
756 | } | |
757 | } | |
758 | ||
759 | static void receive_error(struct r3964_info *pInfo, const char flag) | |
760 | { | |
761 | switch (flag) | |
762 | { | |
763 | case TTY_NORMAL: | |
764 | break; | |
765 | case TTY_BREAK: | |
766 | TRACE_PE("received break") | |
767 | pInfo->flags |= R3964_BREAK; | |
768 | break; | |
769 | case TTY_PARITY: | |
770 | TRACE_PE("parity error") | |
771 | pInfo->flags |= R3964_PARITY; | |
772 | break; | |
773 | case TTY_FRAME: | |
774 | TRACE_PE("frame error") | |
775 | pInfo->flags |= R3964_FRAME; | |
776 | break; | |
777 | case TTY_OVERRUN: | |
778 | TRACE_PE("frame overrun") | |
779 | pInfo->flags |= R3964_OVERRUN; | |
780 | break; | |
781 | default: | |
782 | TRACE_PE("receive_error - unknown flag %d", flag); | |
783 | pInfo->flags |= R3964_UNKNOWN; | |
784 | break; | |
785 | } | |
786 | } | |
787 | ||
788 | static void on_timeout(unsigned long priv) | |
789 | { | |
790 | struct r3964_info *pInfo = (void *)priv; | |
791 | ||
792 | switch(pInfo->state) | |
793 | { | |
794 | case R3964_TX_REQUEST: | |
795 | TRACE_PE("TX_REQUEST - timeout"); | |
796 | retry_transmit(pInfo); | |
797 | break; | |
798 | case R3964_WAIT_ZVZ_BEFORE_TX_RETRY: | |
799 | put_char(pInfo, NAK); | |
800 | flush(pInfo); | |
801 | retry_transmit(pInfo); | |
802 | break; | |
803 | case R3964_WAIT_FOR_TX_ACK: | |
804 | TRACE_PE("WAIT_FOR_TX_ACK - timeout"); | |
805 | retry_transmit(pInfo); | |
806 | break; | |
807 | case R3964_WAIT_FOR_RX_BUF: | |
808 | TRACE_PE("WAIT_FOR_RX_BUF - timeout"); | |
809 | put_char(pInfo, NAK); | |
810 | flush(pInfo); | |
811 | pInfo->state=R3964_IDLE; | |
812 | break; | |
813 | case R3964_RECEIVING: | |
814 | TRACE_PE("RECEIVING - timeout after %d chars", | |
815 | pInfo->rx_position); | |
816 | put_char(pInfo, NAK); | |
817 | flush(pInfo); | |
818 | pInfo->state=R3964_IDLE; | |
819 | break; | |
820 | case R3964_WAIT_FOR_RX_REPEAT: | |
821 | TRACE_PE("WAIT_FOR_RX_REPEAT - timeout"); | |
822 | pInfo->state=R3964_IDLE; | |
823 | break; | |
824 | case R3964_WAIT_FOR_BCC: | |
825 | TRACE_PE("WAIT_FOR_BCC - timeout"); | |
826 | put_char(pInfo, NAK); | |
827 | flush(pInfo); | |
828 | pInfo->state=R3964_IDLE; | |
829 | break; | |
830 | } | |
831 | } | |
832 | ||
833 | static struct r3964_client_info *findClient( | |
834 | struct r3964_info *pInfo, pid_t pid) | |
835 | { | |
836 | struct r3964_client_info *pClient; | |
837 | ||
838 | for(pClient=pInfo->firstClient; pClient; pClient=pClient->next) | |
839 | { | |
840 | if(pClient->pid == pid) | |
841 | { | |
842 | return pClient; | |
843 | } | |
844 | } | |
845 | return NULL; | |
846 | } | |
847 | ||
848 | static int enable_signals(struct r3964_info *pInfo, pid_t pid, int arg) | |
849 | { | |
850 | struct r3964_client_info *pClient; | |
851 | struct r3964_client_info **ppClient; | |
852 | struct r3964_message *pMsg; | |
853 | ||
854 | if((arg & R3964_SIG_ALL)==0) | |
855 | { | |
856 | /* Remove client from client list */ | |
857 | for(ppClient=&pInfo->firstClient; *ppClient; ppClient=&(*ppClient)->next) | |
858 | { | |
859 | pClient = *ppClient; | |
860 | ||
861 | if(pClient->pid == pid) | |
862 | { | |
863 | TRACE_PS("removing client %d from client list", pid); | |
864 | *ppClient = pClient->next; | |
865 | while(pClient->msg_count) | |
866 | { | |
867 | pMsg=remove_msg(pInfo, pClient); | |
868 | if(pMsg) | |
869 | { | |
870 | kfree(pMsg); | |
87e0f3db | 871 | TRACE_M("enable_signals - msg kfree %p",pMsg); |
1da177e4 LT |
872 | } |
873 | } | |
874 | kfree(pClient); | |
87e0f3db | 875 | TRACE_M("enable_signals - kfree %p",pClient); |
1da177e4 LT |
876 | return 0; |
877 | } | |
878 | } | |
879 | return -EINVAL; | |
880 | } | |
881 | else | |
882 | { | |
883 | pClient=findClient(pInfo, pid); | |
884 | if(pClient) | |
885 | { | |
886 | /* update signal options */ | |
887 | pClient->sig_flags=arg; | |
888 | } | |
889 | else | |
890 | { | |
891 | /* add client to client list */ | |
892 | pClient=kmalloc(sizeof(struct r3964_client_info), GFP_KERNEL); | |
87e0f3db | 893 | TRACE_M("enable_signals - kmalloc %p",pClient); |
1da177e4 LT |
894 | if(pClient==NULL) |
895 | return -ENOMEM; | |
896 | ||
897 | TRACE_PS("add client %d to client list", pid); | |
898 | spin_lock_init(&pClient->lock); | |
899 | pClient->sig_flags=arg; | |
900 | pClient->pid = pid; | |
901 | pClient->next=pInfo->firstClient; | |
902 | pClient->first_msg = NULL; | |
903 | pClient->last_msg = NULL; | |
904 | pClient->next_block_to_read = NULL; | |
905 | pClient->msg_count = 0; | |
906 | pInfo->firstClient=pClient; | |
907 | } | |
908 | } | |
909 | ||
910 | return 0; | |
911 | } | |
912 | ||
913 | static int read_telegram(struct r3964_info *pInfo, pid_t pid, unsigned char __user *buf) | |
914 | { | |
915 | struct r3964_client_info *pClient; | |
916 | struct r3964_block_header *block; | |
917 | ||
918 | if(!buf) | |
919 | { | |
920 | return -EINVAL; | |
921 | } | |
922 | ||
923 | pClient=findClient(pInfo,pid); | |
924 | if(pClient==NULL) | |
925 | { | |
926 | return -EINVAL; | |
927 | } | |
928 | ||
929 | block=pClient->next_block_to_read; | |
930 | if(!block) | |
931 | { | |
932 | return 0; | |
933 | } | |
934 | else | |
935 | { | |
936 | if (copy_to_user (buf, block->data, block->length)) | |
937 | return -EFAULT; | |
938 | ||
939 | remove_client_block(pInfo, pClient); | |
940 | return block->length; | |
941 | } | |
942 | ||
943 | return -EINVAL; | |
944 | } | |
945 | ||
946 | static void add_msg(struct r3964_client_info *pClient, int msg_id, int arg, | |
947 | int error_code, struct r3964_block_header *pBlock) | |
948 | { | |
949 | struct r3964_message *pMsg; | |
950 | unsigned long flags; | |
951 | ||
952 | if(pClient->msg_count<R3964_MAX_MSG_COUNT-1) | |
953 | { | |
954 | queue_the_message: | |
955 | ||
956 | pMsg = kmalloc(sizeof(struct r3964_message), GFP_KERNEL); | |
87e0f3db | 957 | TRACE_M("add_msg - kmalloc %p",pMsg); |
1da177e4 LT |
958 | if(pMsg==NULL) { |
959 | return; | |
960 | } | |
961 | ||
962 | spin_lock_irqsave(&pClient->lock, flags); | |
963 | ||
964 | pMsg->msg_id = msg_id; | |
965 | pMsg->arg = arg; | |
966 | pMsg->error_code = error_code; | |
967 | pMsg->block = pBlock; | |
968 | pMsg->next = NULL; | |
969 | ||
970 | if(pClient->last_msg==NULL) | |
971 | { | |
972 | pClient->first_msg=pClient->last_msg=pMsg; | |
973 | } | |
974 | else | |
975 | { | |
976 | pClient->last_msg->next = pMsg; | |
977 | pClient->last_msg=pMsg; | |
978 | } | |
979 | ||
980 | pClient->msg_count++; | |
981 | ||
982 | if(pBlock!=NULL) | |
983 | { | |
984 | pBlock->locks++; | |
985 | } | |
986 | spin_unlock_irqrestore(&pClient->lock, flags); | |
987 | } | |
988 | else | |
989 | { | |
990 | if((pClient->last_msg->msg_id == R3964_MSG_ACK) | |
991 | && (pClient->last_msg->error_code==R3964_OVERFLOW)) | |
992 | { | |
993 | pClient->last_msg->arg++; | |
994 | TRACE_PE("add_msg - inc prev OVERFLOW-msg"); | |
995 | } | |
996 | else | |
997 | { | |
998 | msg_id = R3964_MSG_ACK; | |
999 | arg = 0; | |
1000 | error_code = R3964_OVERFLOW; | |
1001 | pBlock = NULL; | |
1002 | TRACE_PE("add_msg - queue OVERFLOW-msg"); | |
1003 | goto queue_the_message; | |
1004 | } | |
1005 | } | |
1006 | /* Send SIGIO signal to client process: */ | |
1007 | if(pClient->sig_flags & R3964_USE_SIGIO) | |
1008 | { | |
1009 | kill_proc(pClient->pid, SIGIO, 1); | |
1010 | } | |
1011 | } | |
1012 | ||
1013 | static struct r3964_message *remove_msg(struct r3964_info *pInfo, | |
1014 | struct r3964_client_info *pClient) | |
1015 | { | |
1016 | struct r3964_message *pMsg=NULL; | |
1017 | unsigned long flags; | |
1018 | ||
1019 | if(pClient->first_msg) | |
1020 | { | |
1021 | spin_lock_irqsave(&pClient->lock, flags); | |
1022 | ||
1023 | pMsg = pClient->first_msg; | |
1024 | pClient->first_msg = pMsg->next; | |
1025 | if(pClient->first_msg==NULL) | |
1026 | { | |
1027 | pClient->last_msg = NULL; | |
1028 | } | |
1029 | ||
1030 | pClient->msg_count--; | |
1031 | if(pMsg->block) | |
1032 | { | |
1033 | remove_client_block(pInfo, pClient); | |
1034 | pClient->next_block_to_read = pMsg->block; | |
1035 | } | |
1036 | spin_unlock_irqrestore(&pClient->lock, flags); | |
1037 | } | |
1038 | return pMsg; | |
1039 | } | |
1040 | ||
1041 | static void remove_client_block(struct r3964_info *pInfo, | |
1042 | struct r3964_client_info *pClient) | |
1043 | { | |
1044 | struct r3964_block_header *block; | |
1045 | ||
1046 | TRACE_PS("remove_client_block PID %d", pClient->pid); | |
1047 | ||
1048 | block=pClient->next_block_to_read; | |
1049 | if(block) | |
1050 | { | |
1051 | block->locks--; | |
1052 | if(block->locks==0) | |
1053 | { | |
1054 | remove_from_rx_queue(pInfo, block); | |
1055 | } | |
1056 | } | |
1057 | pClient->next_block_to_read = NULL; | |
1058 | } | |
1059 | ||
1060 | ||
1061 | /************************************************************* | |
1062 | * Line discipline routines | |
1063 | *************************************************************/ | |
1064 | ||
1065 | static int r3964_open(struct tty_struct *tty) | |
1066 | { | |
1067 | struct r3964_info *pInfo; | |
1068 | ||
1069 | TRACE_L("open"); | |
87e0f3db AD |
1070 | TRACE_L("tty=%p, PID=%d, disc_data=%p", |
1071 | tty, current->pid, tty->disc_data); | |
1da177e4 LT |
1072 | |
1073 | pInfo=kmalloc(sizeof(struct r3964_info), GFP_KERNEL); | |
87e0f3db | 1074 | TRACE_M("r3964_open - info kmalloc %p",pInfo); |
1da177e4 LT |
1075 | |
1076 | if(!pInfo) | |
1077 | { | |
1078 | printk(KERN_ERR "r3964: failed to alloc info structure\n"); | |
1079 | return -ENOMEM; | |
1080 | } | |
1081 | ||
1082 | pInfo->rx_buf = kmalloc(RX_BUF_SIZE, GFP_KERNEL); | |
87e0f3db | 1083 | TRACE_M("r3964_open - rx_buf kmalloc %p",pInfo->rx_buf); |
1da177e4 LT |
1084 | |
1085 | if(!pInfo->rx_buf) | |
1086 | { | |
1087 | printk(KERN_ERR "r3964: failed to alloc receive buffer\n"); | |
1088 | kfree(pInfo); | |
87e0f3db | 1089 | TRACE_M("r3964_open - info kfree %p",pInfo); |
1da177e4 LT |
1090 | return -ENOMEM; |
1091 | } | |
1092 | ||
1093 | pInfo->tx_buf = kmalloc(TX_BUF_SIZE, GFP_KERNEL); | |
87e0f3db | 1094 | TRACE_M("r3964_open - tx_buf kmalloc %p",pInfo->tx_buf); |
1da177e4 LT |
1095 | |
1096 | if(!pInfo->tx_buf) | |
1097 | { | |
1098 | printk(KERN_ERR "r3964: failed to alloc transmit buffer\n"); | |
1099 | kfree(pInfo->rx_buf); | |
87e0f3db | 1100 | TRACE_M("r3964_open - rx_buf kfree %p",pInfo->rx_buf); |
1da177e4 | 1101 | kfree(pInfo); |
87e0f3db | 1102 | TRACE_M("r3964_open - info kfree %p",pInfo); |
1da177e4 LT |
1103 | return -ENOMEM; |
1104 | } | |
1105 | ||
1106 | spin_lock_init(&pInfo->lock); | |
1107 | pInfo->tty = tty; | |
1108 | init_waitqueue_head (&pInfo->read_wait); | |
1109 | pInfo->priority = R3964_MASTER; | |
1110 | pInfo->rx_first = pInfo->rx_last = NULL; | |
1111 | pInfo->tx_first = pInfo->tx_last = NULL; | |
1112 | pInfo->rx_position = 0; | |
1113 | pInfo->tx_position = 0; | |
1114 | pInfo->last_rx = 0; | |
1115 | pInfo->blocks_in_rx_queue = 0; | |
1116 | pInfo->firstClient=NULL; | |
1117 | pInfo->state=R3964_IDLE; | |
1118 | pInfo->flags = R3964_DEBUG; | |
1119 | pInfo->nRetry = 0; | |
1120 | ||
1121 | tty->disc_data = pInfo; | |
1122 | ||
1123 | init_timer(&pInfo->tmr); | |
1124 | pInfo->tmr.data = (unsigned long)pInfo; | |
1125 | pInfo->tmr.function = on_timeout; | |
1126 | ||
1127 | return 0; | |
1128 | } | |
1129 | ||
1130 | static void r3964_close(struct tty_struct *tty) | |
1131 | { | |
1132 | struct r3964_info *pInfo=(struct r3964_info*)tty->disc_data; | |
1133 | struct r3964_client_info *pClient, *pNext; | |
1134 | struct r3964_message *pMsg; | |
1135 | struct r3964_block_header *pHeader, *pNextHeader; | |
1136 | unsigned long flags; | |
1137 | ||
1138 | TRACE_L("close"); | |
1139 | ||
1140 | /* | |
1141 | * Make sure that our task queue isn't activated. If it | |
1142 | * is, take it out of the linked list. | |
1143 | */ | |
1144 | del_timer_sync(&pInfo->tmr); | |
1145 | ||
1146 | /* Remove client-structs and message queues: */ | |
1147 | pClient=pInfo->firstClient; | |
1148 | while(pClient) | |
1149 | { | |
1150 | pNext=pClient->next; | |
1151 | while(pClient->msg_count) | |
1152 | { | |
1153 | pMsg=remove_msg(pInfo, pClient); | |
1154 | if(pMsg) | |
1155 | { | |
1156 | kfree(pMsg); | |
87e0f3db | 1157 | TRACE_M("r3964_close - msg kfree %p",pMsg); |
1da177e4 LT |
1158 | } |
1159 | } | |
1160 | kfree(pClient); | |
87e0f3db | 1161 | TRACE_M("r3964_close - client kfree %p",pClient); |
1da177e4 LT |
1162 | pClient=pNext; |
1163 | } | |
1164 | /* Remove jobs from tx_queue: */ | |
1165 | spin_lock_irqsave(&pInfo->lock, flags); | |
1166 | pHeader=pInfo->tx_first; | |
1167 | pInfo->tx_first=pInfo->tx_last=NULL; | |
1168 | spin_unlock_irqrestore(&pInfo->lock, flags); | |
1169 | ||
1170 | while(pHeader) | |
1171 | { | |
1172 | pNextHeader=pHeader->next; | |
1173 | kfree(pHeader); | |
1174 | pHeader=pNextHeader; | |
1175 | } | |
1176 | ||
1177 | /* Free buffers: */ | |
1178 | wake_up_interruptible(&pInfo->read_wait); | |
1179 | kfree(pInfo->rx_buf); | |
87e0f3db | 1180 | TRACE_M("r3964_close - rx_buf kfree %p",pInfo->rx_buf); |
1da177e4 | 1181 | kfree(pInfo->tx_buf); |
87e0f3db | 1182 | TRACE_M("r3964_close - tx_buf kfree %p",pInfo->tx_buf); |
1da177e4 | 1183 | kfree(pInfo); |
87e0f3db | 1184 | TRACE_M("r3964_close - info kfree %p",pInfo); |
1da177e4 LT |
1185 | } |
1186 | ||
1187 | static ssize_t r3964_read(struct tty_struct *tty, struct file *file, | |
1188 | unsigned char __user *buf, size_t nr) | |
1189 | { | |
1190 | struct r3964_info *pInfo=(struct r3964_info*)tty->disc_data; | |
1191 | struct r3964_client_info *pClient; | |
1192 | struct r3964_message *pMsg; | |
1193 | struct r3964_client_message theMsg; | |
1194 | DECLARE_WAITQUEUE (wait, current); | |
1195 | ||
1196 | int pid = current->pid; | |
1197 | int count; | |
1198 | ||
1199 | TRACE_L("read()"); | |
1200 | ||
1201 | pClient=findClient(pInfo, pid); | |
1202 | if(pClient) | |
1203 | { | |
1204 | pMsg = remove_msg(pInfo, pClient); | |
1205 | if(pMsg==NULL) | |
1206 | { | |
1207 | /* no messages available. */ | |
1208 | if (file->f_flags & O_NONBLOCK) | |
1209 | { | |
1210 | return -EAGAIN; | |
1211 | } | |
1212 | /* block until there is a message: */ | |
1213 | add_wait_queue(&pInfo->read_wait, &wait); | |
1214 | repeat: | |
1215 | current->state = TASK_INTERRUPTIBLE; | |
1216 | pMsg = remove_msg(pInfo, pClient); | |
1217 | if (!pMsg && !signal_pending(current)) | |
1218 | { | |
1219 | schedule(); | |
1220 | goto repeat; | |
1221 | } | |
1222 | current->state = TASK_RUNNING; | |
1223 | remove_wait_queue(&pInfo->read_wait, &wait); | |
1224 | } | |
1225 | ||
1226 | /* If we still haven't got a message, we must have been signalled */ | |
1227 | ||
1228 | if (!pMsg) return -EINTR; | |
1229 | ||
1230 | /* deliver msg to client process: */ | |
1231 | theMsg.msg_id = pMsg->msg_id; | |
1232 | theMsg.arg = pMsg->arg; | |
1233 | theMsg.error_code = pMsg->error_code; | |
1234 | count = sizeof(struct r3964_client_message); | |
1235 | ||
1236 | kfree(pMsg); | |
87e0f3db | 1237 | TRACE_M("r3964_read - msg kfree %p",pMsg); |
1da177e4 LT |
1238 | |
1239 | if (copy_to_user(buf,&theMsg, count)) | |
1240 | return -EFAULT; | |
1241 | ||
1242 | TRACE_PS("read - return %d", count); | |
1243 | return count; | |
1244 | } | |
1245 | return -EPERM; | |
1246 | } | |
1247 | ||
1248 | static ssize_t r3964_write(struct tty_struct * tty, struct file * file, | |
1249 | const unsigned char *data, size_t count) | |
1250 | { | |
1251 | struct r3964_info *pInfo=(struct r3964_info*)tty->disc_data; | |
1252 | struct r3964_block_header *pHeader; | |
1253 | struct r3964_client_info *pClient; | |
1254 | unsigned char *new_data; | |
1255 | int pid; | |
1256 | ||
1257 | TRACE_L("write request, %d characters", count); | |
1258 | /* | |
1259 | * Verify the pointers | |
1260 | */ | |
1261 | ||
1262 | if(!pInfo) | |
1263 | return -EIO; | |
1264 | ||
1265 | /* | |
1266 | * Ensure that the caller does not wish to send too much. | |
1267 | */ | |
1268 | if (count > R3964_MTU) | |
1269 | { | |
1270 | if (pInfo->flags & R3964_DEBUG) | |
1271 | { | |
1272 | TRACE_L (KERN_WARNING | |
1273 | "r3964_write: truncating user packet " | |
1274 | "from %u to mtu %d", count, R3964_MTU); | |
1275 | } | |
1276 | count = R3964_MTU; | |
1277 | } | |
1278 | /* | |
1279 | * Allocate a buffer for the data and copy it from the buffer with header prepended | |
1280 | */ | |
1281 | new_data = kmalloc (count+sizeof(struct r3964_block_header), GFP_KERNEL); | |
87e0f3db | 1282 | TRACE_M("r3964_write - kmalloc %p",new_data); |
1da177e4 LT |
1283 | if (new_data == NULL) { |
1284 | if (pInfo->flags & R3964_DEBUG) | |
1285 | { | |
1286 | printk (KERN_ERR | |
1287 | "r3964_write: no memory\n"); | |
1288 | } | |
1289 | return -ENOSPC; | |
1290 | } | |
1291 | ||
1292 | pHeader = (struct r3964_block_header *)new_data; | |
1293 | pHeader->data = new_data + sizeof(struct r3964_block_header); | |
1294 | pHeader->length = count; | |
1295 | pHeader->locks = 0; | |
1296 | pHeader->owner = NULL; | |
1297 | ||
1298 | pid=current->pid; | |
1299 | ||
1300 | pClient=findClient(pInfo, pid); | |
1301 | if(pClient) | |
1302 | { | |
1303 | pHeader->owner = pClient; | |
1304 | } | |
1305 | ||
1306 | memcpy(pHeader->data, data, count); /* We already verified this */ | |
1307 | ||
1308 | if(pInfo->flags & R3964_DEBUG) | |
1309 | { | |
1310 | dump_block(pHeader->data, count); | |
1311 | } | |
1312 | ||
1313 | /* | |
1314 | * Add buffer to transmit-queue: | |
1315 | */ | |
1316 | add_tx_queue(pInfo, pHeader); | |
1317 | trigger_transmit(pInfo); | |
1318 | ||
1319 | return 0; | |
1320 | } | |
1321 | ||
1322 | static int r3964_ioctl(struct tty_struct * tty, struct file * file, | |
1323 | unsigned int cmd, unsigned long arg) | |
1324 | { | |
1325 | struct r3964_info *pInfo=(struct r3964_info*)tty->disc_data; | |
1326 | if(pInfo==NULL) | |
1327 | return -EINVAL; | |
1328 | switch(cmd) | |
1329 | { | |
1330 | case R3964_ENABLE_SIGNALS: | |
1331 | return enable_signals(pInfo, current->pid, arg); | |
1332 | case R3964_SETPRIORITY: | |
1333 | if(arg<R3964_MASTER || arg>R3964_SLAVE) | |
1334 | return -EINVAL; | |
1335 | pInfo->priority = arg & 0xff; | |
1336 | return 0; | |
1337 | case R3964_USE_BCC: | |
1338 | if(arg) | |
1339 | pInfo->flags |= R3964_BCC; | |
1340 | else | |
1341 | pInfo->flags &= ~R3964_BCC; | |
1342 | return 0; | |
1343 | case R3964_READ_TELEGRAM: | |
1344 | return read_telegram(pInfo, current->pid, (unsigned char __user *)arg); | |
1345 | default: | |
1346 | return -ENOIOCTLCMD; | |
1347 | } | |
1348 | } | |
1349 | ||
1350 | static void r3964_set_termios(struct tty_struct *tty, struct termios * old) | |
1351 | { | |
1352 | TRACE_L("set_termios"); | |
1353 | } | |
1354 | ||
1355 | /* Called without the kernel lock held - fine */ | |
1356 | static unsigned int r3964_poll(struct tty_struct * tty, struct file * file, | |
1357 | struct poll_table_struct *wait) | |
1358 | { | |
1359 | struct r3964_info *pInfo=(struct r3964_info*)tty->disc_data; | |
1360 | int pid=current->pid; | |
1361 | struct r3964_client_info *pClient; | |
1362 | struct r3964_message *pMsg=NULL; | |
1363 | unsigned long flags; | |
1364 | int result = POLLOUT; | |
1365 | ||
1366 | TRACE_L("POLL"); | |
1367 | ||
1368 | pClient=findClient(pInfo,pid); | |
1369 | if(pClient) | |
1370 | { | |
1371 | poll_wait(file, &pInfo->read_wait, wait); | |
1372 | spin_lock_irqsave(&pInfo->lock, flags); | |
1373 | pMsg=pClient->first_msg; | |
1374 | spin_unlock_irqrestore(&pInfo->lock, flags); | |
1375 | if(pMsg) | |
1376 | result |= POLLIN | POLLRDNORM; | |
1377 | } | |
1378 | else | |
1379 | { | |
1380 | result = -EINVAL; | |
1381 | } | |
1382 | return result; | |
1383 | } | |
1384 | ||
1385 | static void r3964_receive_buf(struct tty_struct *tty, const unsigned char *cp, | |
1386 | char *fp, int count) | |
1387 | { | |
1388 | struct r3964_info *pInfo=(struct r3964_info*)tty->disc_data; | |
1389 | const unsigned char *p; | |
1390 | char *f, flags = 0; | |
1391 | int i; | |
1392 | ||
1393 | for (i=count, p = cp, f = fp; i; i--, p++) { | |
1394 | if (f) | |
1395 | flags = *f++; | |
1396 | if(flags==TTY_NORMAL) | |
1397 | { | |
1398 | receive_char(pInfo, *p); | |
1399 | } | |
1400 | else | |
1401 | { | |
1402 | receive_error(pInfo, flags); | |
1403 | } | |
1404 | ||
1405 | } | |
1406 | } | |
1407 | ||
1408 | static int r3964_receive_room(struct tty_struct *tty) | |
1409 | { | |
1410 | TRACE_L("receive_room"); | |
1411 | return -1; | |
1412 | } | |
1413 | ||
1414 | ||
1415 | MODULE_LICENSE("GPL"); | |
1416 | MODULE_ALIAS_LDISC(N_R3964); |