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18#include <linux/kernel.h>
19#include <linux/module.h>
20#include <linux/mutex.h>
21#include <linux/ppp_defs.h>
22#include <linux/if.h>
23#include <linux/ppp-ioctl.h>
24#include <linux/sched.h>
25#include <linux/serial.h>
26#include <linux/slab.h>
27#include <linux/tty.h>
28#include <linux/tty_driver.h>
29#include <linux/tty_flip.h>
30#include <linux/uaccess.h>
31
32#include "tty.h"
33#include "network.h"
34#include "hardware.h"
35#include "main.h"
36
37#define IPWIRELESS_PCMCIA_START (0)
38#define IPWIRELESS_PCMCIA_MINORS (24)
39#define IPWIRELESS_PCMCIA_MINOR_RANGE (8)
40
41#define TTYTYPE_MODEM (0)
42#define TTYTYPE_MONITOR (1)
43#define TTYTYPE_RAS_RAW (2)
44
45struct ipw_tty {
46 struct tty_port port;
47 int index;
48 struct ipw_hardware *hardware;
49 unsigned int channel_idx;
50 unsigned int secondary_channel_idx;
51 int tty_type;
52 struct ipw_network *network;
53 unsigned int control_lines;
54 struct mutex ipw_tty_mutex;
55 int tx_bytes_queued;
56 int closing;
57};
58
59static struct ipw_tty *ttys[IPWIRELESS_PCMCIA_MINORS];
60
61static struct tty_driver *ipw_tty_driver;
62
63static char *tty_type_name(int tty_type)
64{
65 static char *channel_names[] = {
66 "modem",
67 "monitor",
68 "RAS-raw"
69 };
70
71 return channel_names[tty_type];
72}
73
74static struct ipw_tty *get_tty(int index)
75{
76
77
78
79
80
81 if (!ipwireless_loopback && index >=
82 IPWIRELESS_PCMCIA_MINOR_RANGE * TTYTYPE_RAS_RAW)
83 return NULL;
84
85 return ttys[index];
86}
87
88static int ipw_open(struct tty_struct *linux_tty, struct file *filp)
89{
90 struct ipw_tty *tty = get_tty(linux_tty->index);
91
92 if (!tty)
93 return -ENODEV;
94
95 mutex_lock(&tty->ipw_tty_mutex);
96 if (tty->port.count == 0)
97 tty->tx_bytes_queued = 0;
98
99 tty->port.count++;
100
101 tty->port.tty = linux_tty;
102 linux_tty->driver_data = tty;
103 tty->port.low_latency = 1;
104
105 if (tty->tty_type == TTYTYPE_MODEM)
106 ipwireless_ppp_open(tty->network);
107
108 mutex_unlock(&tty->ipw_tty_mutex);
109
110 return 0;
111}
112
113static void do_ipw_close(struct ipw_tty *tty)
114{
115 tty->port.count--;
116
117 if (tty->port.count == 0) {
118 struct tty_struct *linux_tty = tty->port.tty;
119
120 if (linux_tty != NULL) {
121 tty->port.tty = NULL;
122 linux_tty->driver_data = NULL;
123
124 if (tty->tty_type == TTYTYPE_MODEM)
125 ipwireless_ppp_close(tty->network);
126 }
127 }
128}
129
130static void ipw_hangup(struct tty_struct *linux_tty)
131{
132 struct ipw_tty *tty = linux_tty->driver_data;
133
134 if (!tty)
135 return;
136
137 mutex_lock(&tty->ipw_tty_mutex);
138 if (tty->port.count == 0) {
139 mutex_unlock(&tty->ipw_tty_mutex);
140 return;
141 }
142
143 do_ipw_close(tty);
144
145 mutex_unlock(&tty->ipw_tty_mutex);
146}
147
148static void ipw_close(struct tty_struct *linux_tty, struct file *filp)
149{
150 ipw_hangup(linux_tty);
151}
152
153
154void ipwireless_tty_received(struct ipw_tty *tty, unsigned char *data,
155 unsigned int length)
156{
157 int work = 0;
158
159 mutex_lock(&tty->ipw_tty_mutex);
160
161 if (!tty->port.count) {
162 mutex_unlock(&tty->ipw_tty_mutex);
163 return;
164 }
165 mutex_unlock(&tty->ipw_tty_mutex);
166
167 work = tty_insert_flip_string(&tty->port, data, length);
168
169 if (work != length)
170 printk(KERN_DEBUG IPWIRELESS_PCCARD_NAME
171 ": %d chars not inserted to flip buffer!\n",
172 length - work);
173
174 if (work)
175 tty_flip_buffer_push(&tty->port);
176}
177
178static void ipw_write_packet_sent_callback(void *callback_data,
179 unsigned int packet_length)
180{
181 struct ipw_tty *tty = callback_data;
182
183
184
185
186
187 tty->tx_bytes_queued -= packet_length;
188}
189
190static int ipw_write(struct tty_struct *linux_tty,
191 const unsigned char *buf, int count)
192{
193 struct ipw_tty *tty = linux_tty->driver_data;
194 int room, ret;
195
196 if (!tty)
197 return -ENODEV;
198
199 mutex_lock(&tty->ipw_tty_mutex);
200 if (!tty->port.count) {
201 mutex_unlock(&tty->ipw_tty_mutex);
202 return -EINVAL;
203 }
204
205 room = IPWIRELESS_TX_QUEUE_SIZE - tty->tx_bytes_queued;
206 if (room < 0)
207 room = 0;
208
209 if (count > room)
210 count = room;
211
212 if (count == 0) {
213 mutex_unlock(&tty->ipw_tty_mutex);
214 return 0;
215 }
216
217 ret = ipwireless_send_packet(tty->hardware, IPW_CHANNEL_RAS,
218 buf, count,
219 ipw_write_packet_sent_callback, tty);
220 if (ret == -1) {
221 mutex_unlock(&tty->ipw_tty_mutex);
222 return 0;
223 }
224
225 tty->tx_bytes_queued += count;
226 mutex_unlock(&tty->ipw_tty_mutex);
227
228 return count;
229}
230
231static int ipw_write_room(struct tty_struct *linux_tty)
232{
233 struct ipw_tty *tty = linux_tty->driver_data;
234 int room;
235
236
237 if (!tty)
238 return -ENODEV;
239
240 if (!tty->port.count)
241 return -EINVAL;
242
243 room = IPWIRELESS_TX_QUEUE_SIZE - tty->tx_bytes_queued;
244 if (room < 0)
245 room = 0;
246
247 return room;
248}
249
250static int ipwireless_get_serial_info(struct ipw_tty *tty,
251 struct serial_struct __user *retinfo)
252{
253 struct serial_struct tmp;
254
255 memset(&tmp, 0, sizeof(tmp));
256 tmp.type = PORT_UNKNOWN;
257 tmp.line = tty->index;
258 tmp.baud_base = 115200;
259
260 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
261 return -EFAULT;
262
263 return 0;
264}
265
266static int ipw_chars_in_buffer(struct tty_struct *linux_tty)
267{
268 struct ipw_tty *tty = linux_tty->driver_data;
269
270 if (!tty)
271 return 0;
272
273 if (!tty->port.count)
274 return 0;
275
276 return tty->tx_bytes_queued;
277}
278
279static int get_control_lines(struct ipw_tty *tty)
280{
281 unsigned int my = tty->control_lines;
282 unsigned int out = 0;
283
284 if (my & IPW_CONTROL_LINE_RTS)
285 out |= TIOCM_RTS;
286 if (my & IPW_CONTROL_LINE_DTR)
287 out |= TIOCM_DTR;
288 if (my & IPW_CONTROL_LINE_CTS)
289 out |= TIOCM_CTS;
290 if (my & IPW_CONTROL_LINE_DSR)
291 out |= TIOCM_DSR;
292 if (my & IPW_CONTROL_LINE_DCD)
293 out |= TIOCM_CD;
294
295 return out;
296}
297
298static int set_control_lines(struct ipw_tty *tty, unsigned int set,
299 unsigned int clear)
300{
301 int ret;
302
303 if (set & TIOCM_RTS) {
304 ret = ipwireless_set_RTS(tty->hardware, tty->channel_idx, 1);
305 if (ret)
306 return ret;
307 if (tty->secondary_channel_idx != -1) {
308 ret = ipwireless_set_RTS(tty->hardware,
309 tty->secondary_channel_idx, 1);
310 if (ret)
311 return ret;
312 }
313 }
314 if (set & TIOCM_DTR) {
315 ret = ipwireless_set_DTR(tty->hardware, tty->channel_idx, 1);
316 if (ret)
317 return ret;
318 if (tty->secondary_channel_idx != -1) {
319 ret = ipwireless_set_DTR(tty->hardware,
320 tty->secondary_channel_idx, 1);
321 if (ret)
322 return ret;
323 }
324 }
325 if (clear & TIOCM_RTS) {
326 ret = ipwireless_set_RTS(tty->hardware, tty->channel_idx, 0);
327 if (tty->secondary_channel_idx != -1) {
328 ret = ipwireless_set_RTS(tty->hardware,
329 tty->secondary_channel_idx, 0);
330 if (ret)
331 return ret;
332 }
333 }
334 if (clear & TIOCM_DTR) {
335 ret = ipwireless_set_DTR(tty->hardware, tty->channel_idx, 0);
336 if (tty->secondary_channel_idx != -1) {
337 ret = ipwireless_set_DTR(tty->hardware,
338 tty->secondary_channel_idx, 0);
339 if (ret)
340 return ret;
341 }
342 }
343 return 0;
344}
345
346static int ipw_tiocmget(struct tty_struct *linux_tty)
347{
348 struct ipw_tty *tty = linux_tty->driver_data;
349
350
351 if (!tty)
352 return -ENODEV;
353
354 if (!tty->port.count)
355 return -EINVAL;
356
357 return get_control_lines(tty);
358}
359
360static int
361ipw_tiocmset(struct tty_struct *linux_tty,
362 unsigned int set, unsigned int clear)
363{
364 struct ipw_tty *tty = linux_tty->driver_data;
365
366
367 if (!tty)
368 return -ENODEV;
369
370 if (!tty->port.count)
371 return -EINVAL;
372
373 return set_control_lines(tty, set, clear);
374}
375
376static int ipw_ioctl(struct tty_struct *linux_tty,
377 unsigned int cmd, unsigned long arg)
378{
379 struct ipw_tty *tty = linux_tty->driver_data;
380
381 if (!tty)
382 return -ENODEV;
383
384 if (!tty->port.count)
385 return -EINVAL;
386
387
388
389 switch (cmd) {
390 case TIOCGSERIAL:
391 return ipwireless_get_serial_info(tty, (void __user *) arg);
392
393 case TIOCSSERIAL:
394 return 0;
395 }
396
397 if (tty->tty_type == TTYTYPE_MODEM) {
398 switch (cmd) {
399 case PPPIOCGCHAN:
400 {
401 int chan = ipwireless_ppp_channel_index(
402 tty->network);
403
404 if (chan < 0)
405 return -ENODEV;
406 if (put_user(chan, (int __user *) arg))
407 return -EFAULT;
408 }
409 return 0;
410
411 case PPPIOCGUNIT:
412 {
413 int unit = ipwireless_ppp_unit_number(
414 tty->network);
415
416 if (unit < 0)
417 return -ENODEV;
418 if (put_user(unit, (int __user *) arg))
419 return -EFAULT;
420 }
421 return 0;
422
423 case FIONREAD:
424 {
425 int val = 0;
426
427 if (put_user(val, (int __user *) arg))
428 return -EFAULT;
429 }
430 return 0;
431 case TCFLSH:
432 return tty_perform_flush(linux_tty, arg);
433 }
434 }
435 return -ENOIOCTLCMD;
436}
437
438static int add_tty(int j,
439 struct ipw_hardware *hardware,
440 struct ipw_network *network, int channel_idx,
441 int secondary_channel_idx, int tty_type)
442{
443 ttys[j] = kzalloc(sizeof(struct ipw_tty), GFP_KERNEL);
444 if (!ttys[j])
445 return -ENOMEM;
446 ttys[j]->index = j;
447 ttys[j]->hardware = hardware;
448 ttys[j]->channel_idx = channel_idx;
449 ttys[j]->secondary_channel_idx = secondary_channel_idx;
450 ttys[j]->network = network;
451 ttys[j]->tty_type = tty_type;
452 mutex_init(&ttys[j]->ipw_tty_mutex);
453 tty_port_init(&ttys[j]->port);
454
455 tty_port_register_device(&ttys[j]->port, ipw_tty_driver, j, NULL);
456 ipwireless_associate_network_tty(network, channel_idx, ttys[j]);
457
458 if (secondary_channel_idx != -1)
459 ipwireless_associate_network_tty(network,
460 secondary_channel_idx,
461 ttys[j]);
462
463 if (get_tty(j))
464 printk(KERN_INFO IPWIRELESS_PCCARD_NAME
465 ": registering %s device ttyIPWp%d\n",
466 tty_type_name(tty_type), j);
467
468 return 0;
469}
470
471struct ipw_tty *ipwireless_tty_create(struct ipw_hardware *hardware,
472 struct ipw_network *network)
473{
474 int i, j;
475
476 for (i = 0; i < IPWIRELESS_PCMCIA_MINOR_RANGE; i++) {
477 int allfree = 1;
478
479 for (j = i; j < IPWIRELESS_PCMCIA_MINORS;
480 j += IPWIRELESS_PCMCIA_MINOR_RANGE)
481 if (ttys[j] != NULL) {
482 allfree = 0;
483 break;
484 }
485
486 if (allfree) {
487 j = i;
488
489 if (add_tty(j, hardware, network,
490 IPW_CHANNEL_DIALLER, IPW_CHANNEL_RAS,
491 TTYTYPE_MODEM))
492 return NULL;
493
494 j += IPWIRELESS_PCMCIA_MINOR_RANGE;
495 if (add_tty(j, hardware, network,
496 IPW_CHANNEL_DIALLER, -1,
497 TTYTYPE_MONITOR))
498 return NULL;
499
500 j += IPWIRELESS_PCMCIA_MINOR_RANGE;
501 if (add_tty(j, hardware, network,
502 IPW_CHANNEL_RAS, -1,
503 TTYTYPE_RAS_RAW))
504 return NULL;
505
506 return ttys[i];
507 }
508 }
509 return NULL;
510}
511
512
513
514
515void ipwireless_tty_free(struct ipw_tty *tty)
516{
517 int j;
518 struct ipw_network *network = ttys[tty->index]->network;
519
520 for (j = tty->index; j < IPWIRELESS_PCMCIA_MINORS;
521 j += IPWIRELESS_PCMCIA_MINOR_RANGE) {
522 struct ipw_tty *ttyj = ttys[j];
523
524 if (ttyj) {
525 mutex_lock(&ttyj->ipw_tty_mutex);
526 if (get_tty(j))
527 printk(KERN_INFO IPWIRELESS_PCCARD_NAME
528 ": deregistering %s device ttyIPWp%d\n",
529 tty_type_name(ttyj->tty_type), j);
530 ttyj->closing = 1;
531 if (ttyj->port.tty != NULL) {
532 mutex_unlock(&ttyj->ipw_tty_mutex);
533 tty_vhangup(ttyj->port.tty);
534
535
536
537
538 mutex_lock(&ttyj->ipw_tty_mutex);
539 }
540 while (ttyj->port.count)
541 do_ipw_close(ttyj);
542 ipwireless_disassociate_network_ttys(network,
543 ttyj->channel_idx);
544 tty_unregister_device(ipw_tty_driver, j);
545 tty_port_destroy(&ttyj->port);
546 ttys[j] = NULL;
547 mutex_unlock(&ttyj->ipw_tty_mutex);
548 kfree(ttyj);
549 }
550 }
551}
552
553static const struct tty_operations tty_ops = {
554 .open = ipw_open,
555 .close = ipw_close,
556 .hangup = ipw_hangup,
557 .write = ipw_write,
558 .write_room = ipw_write_room,
559 .ioctl = ipw_ioctl,
560 .chars_in_buffer = ipw_chars_in_buffer,
561 .tiocmget = ipw_tiocmget,
562 .tiocmset = ipw_tiocmset,
563};
564
565int ipwireless_tty_init(void)
566{
567 int result;
568
569 ipw_tty_driver = alloc_tty_driver(IPWIRELESS_PCMCIA_MINORS);
570 if (!ipw_tty_driver)
571 return -ENOMEM;
572
573 ipw_tty_driver->driver_name = IPWIRELESS_PCCARD_NAME;
574 ipw_tty_driver->name = "ttyIPWp";
575 ipw_tty_driver->major = 0;
576 ipw_tty_driver->minor_start = IPWIRELESS_PCMCIA_START;
577 ipw_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
578 ipw_tty_driver->subtype = SERIAL_TYPE_NORMAL;
579 ipw_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
580 ipw_tty_driver->init_termios = tty_std_termios;
581 ipw_tty_driver->init_termios.c_cflag =
582 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
583 ipw_tty_driver->init_termios.c_ispeed = 9600;
584 ipw_tty_driver->init_termios.c_ospeed = 9600;
585 tty_set_operations(ipw_tty_driver, &tty_ops);
586 result = tty_register_driver(ipw_tty_driver);
587 if (result) {
588 printk(KERN_ERR IPWIRELESS_PCCARD_NAME
589 ": failed to register tty driver\n");
590 put_tty_driver(ipw_tty_driver);
591 return result;
592 }
593
594 return 0;
595}
596
597void ipwireless_tty_release(void)
598{
599 int ret;
600
601 ret = tty_unregister_driver(ipw_tty_driver);
602 put_tty_driver(ipw_tty_driver);
603 if (ret != 0)
604 printk(KERN_ERR IPWIRELESS_PCCARD_NAME
605 ": tty_unregister_driver failed with code %d\n", ret);
606}
607
608int ipwireless_tty_is_modem(struct ipw_tty *tty)
609{
610 return tty->tty_type == TTYTYPE_MODEM;
611}
612
613void
614ipwireless_tty_notify_control_line_change(struct ipw_tty *tty,
615 unsigned int channel_idx,
616 unsigned int control_lines,
617 unsigned int changed_mask)
618{
619 unsigned int old_control_lines = tty->control_lines;
620
621 tty->control_lines = (tty->control_lines & ~changed_mask)
622 | (control_lines & changed_mask);
623
624
625
626
627
628 if ((old_control_lines & IPW_CONTROL_LINE_DCD)
629 && !(tty->control_lines & IPW_CONTROL_LINE_DCD)
630 && tty->port.tty) {
631 tty_hangup(tty->port.tty);
632 }
633}
634
635
