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Wed Mar 4 11:03:09 2009 UTC (15 years, 3 months ago) by niro
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Wed Mar 4 11:03:09 2009 UTC (15 years, 3 months ago) by niro
File MIME type: text/plain
File size: 36318 byte(s)
Tag kernel26-2.6.12-alx-r9
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 | |
203 | status=tty_register_ldisc(N_R3964, NULL); |
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); |
232 | TRACE_L("open=%x", (int)tty_ldisc_N_R3964.open); |
233 | TRACE_L("tty_ldisc_N_R3964 = %x", (int)&tty_ldisc_N_R3964); |
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 | |
270 | TRACE_Q("add_tx_queue %x, length %d, tx_first = %x", |
271 | (int)pHeader, pHeader->length, (int)pInfo->tx_first ); |
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 |
288 | printk("r3964: remove_from_tx_queue: %x, length %d - ", |
289 | (int)pHeader, (int)pHeader->length ); |
290 | for(pDump=pHeader;pDump;pDump=pDump->next) |
291 | printk("%x ", (int)pDump); |
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); |
322 | TRACE_M("remove_from_tx_queue - kfree %x",(int)pHeader); |
323 | |
324 | TRACE_Q("remove_from_tx_queue: tx_first = %x, tx_last = %x", |
325 | (int)pInfo->tx_first, (int)pInfo->tx_last ); |
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 | |
349 | TRACE_Q("add_rx_queue: %x, length = %d, rx_first = %x, count = %d", |
350 | (int)pHeader, pHeader->length, |
351 | (int)pInfo->rx_first, pInfo->blocks_in_rx_queue); |
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 | |
363 | TRACE_Q("remove_from_rx_queue: rx_first = %x, rx_last = %x, count = %d", |
364 | (int)pInfo->rx_first, (int)pInfo->rx_last, pInfo->blocks_in_rx_queue ); |
365 | TRACE_Q("remove_from_rx_queue: %x, length %d", |
366 | (int)pHeader, (int)pHeader->length ); |
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); |
404 | TRACE_M("remove_from_rx_queue - kfree %x",(int)pHeader); |
405 | |
406 | TRACE_Q("remove_from_rx_queue: rx_first = %x, rx_last = %x, count = %d", |
407 | (int)pInfo->rx_first, (int)pInfo->rx_last, pInfo->blocks_in_rx_queue ); |
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 | |
509 | TRACE_PS("transmit_block %x, room %d, length %d", |
510 | (int)pBlock, room, pBlock->length); |
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); |
591 | TRACE_M("on_receive_block - kmalloc %x",(int)pBlock); |
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); |
871 | TRACE_M("enable_signals - msg kfree %x",(int)pMsg); |
872 | } |
873 | } |
874 | kfree(pClient); |
875 | TRACE_M("enable_signals - kfree %x",(int)pClient); |
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); |
893 | TRACE_M("enable_signals - kmalloc %x",(int)pClient); |
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); |
957 | TRACE_M("add_msg - kmalloc %x",(int)pMsg); |
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"); |
1070 | TRACE_L("tty=%x, PID=%d, disc_data=%x", |
1071 | (int)tty, current->pid, (int)tty->disc_data); |
1072 | |
1073 | pInfo=kmalloc(sizeof(struct r3964_info), GFP_KERNEL); |
1074 | TRACE_M("r3964_open - info kmalloc %x",(int)pInfo); |
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); |
1083 | TRACE_M("r3964_open - rx_buf kmalloc %x",(int)pInfo->rx_buf); |
1084 | |
1085 | if(!pInfo->rx_buf) |
1086 | { |
1087 | printk(KERN_ERR "r3964: failed to alloc receive buffer\n"); |
1088 | kfree(pInfo); |
1089 | TRACE_M("r3964_open - info kfree %x",(int)pInfo); |
1090 | return -ENOMEM; |
1091 | } |
1092 | |
1093 | pInfo->tx_buf = kmalloc(TX_BUF_SIZE, GFP_KERNEL); |
1094 | TRACE_M("r3964_open - tx_buf kmalloc %x",(int)pInfo->tx_buf); |
1095 | |
1096 | if(!pInfo->tx_buf) |
1097 | { |
1098 | printk(KERN_ERR "r3964: failed to alloc transmit buffer\n"); |
1099 | kfree(pInfo->rx_buf); |
1100 | TRACE_M("r3964_open - rx_buf kfree %x",(int)pInfo->rx_buf); |
1101 | kfree(pInfo); |
1102 | TRACE_M("r3964_open - info kfree %x",(int)pInfo); |
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); |
1157 | TRACE_M("r3964_close - msg kfree %x",(int)pMsg); |
1158 | } |
1159 | } |
1160 | kfree(pClient); |
1161 | TRACE_M("r3964_close - client kfree %x",(int)pClient); |
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); |
1180 | TRACE_M("r3964_close - rx_buf kfree %x",(int)pInfo->rx_buf); |
1181 | kfree(pInfo->tx_buf); |
1182 | TRACE_M("r3964_close - tx_buf kfree %x",(int)pInfo->tx_buf); |
1183 | kfree(pInfo); |
1184 | TRACE_M("r3964_close - info kfree %x",(int)pInfo); |
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); |
1237 | TRACE_M("r3964_read - msg kfree %x",(int)pMsg); |
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); |
1282 | TRACE_M("r3964_write - kmalloc %x",(int)new_data); |
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); |