Loading...
1/*
2 * IPWireless 3G PCMCIA Network Driver
3 *
4 * Original code
5 * by Stephen Blackheath <stephen@blacksapphire.com>,
6 * Ben Martel <benm@symmetric.co.nz>
7 *
8 * Copyrighted as follows:
9 * Copyright (C) 2004 by Symmetric Systems Ltd (NZ)
10 *
11 * Various driver changes and rewrites, port to new kernels
12 * Copyright (C) 2006-2007 Jiri Kosina
13 *
14 * Misc code cleanups and updates
15 * Copyright (C) 2007 David Sterba
16 */
17
18#include <linux/init.h>
19#include <linux/kernel.h>
20#include <linux/module.h>
21#include <linux/mutex.h>
22#include <linux/ppp_defs.h>
23#include <linux/if.h>
24#include <linux/if_ppp.h>
25#include <linux/sched.h>
26#include <linux/serial.h>
27#include <linux/slab.h>
28#include <linux/tty.h>
29#include <linux/tty_driver.h>
30#include <linux/tty_flip.h>
31#include <linux/uaccess.h>
32
33#include "tty.h"
34#include "network.h"
35#include "hardware.h"
36#include "main.h"
37
38#define IPWIRELESS_PCMCIA_START (0)
39#define IPWIRELESS_PCMCIA_MINORS (24)
40#define IPWIRELESS_PCMCIA_MINOR_RANGE (8)
41
42#define TTYTYPE_MODEM (0)
43#define TTYTYPE_MONITOR (1)
44#define TTYTYPE_RAS_RAW (2)
45
46struct ipw_tty {
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 struct tty_struct *linux_tty;
54 int open_count;
55 unsigned int control_lines;
56 struct mutex ipw_tty_mutex;
57 int tx_bytes_queued;
58 int closing;
59};
60
61static struct ipw_tty *ttys[IPWIRELESS_PCMCIA_MINORS];
62
63static struct tty_driver *ipw_tty_driver;
64
65static char *tty_type_name(int tty_type)
66{
67 static char *channel_names[] = {
68 "modem",
69 "monitor",
70 "RAS-raw"
71 };
72
73 return channel_names[tty_type];
74}
75
76static void report_registering(struct ipw_tty *tty)
77{
78 char *iftype = tty_type_name(tty->tty_type);
79
80 printk(KERN_INFO IPWIRELESS_PCCARD_NAME
81 ": registering %s device ttyIPWp%d\n", iftype, tty->index);
82}
83
84static void report_deregistering(struct ipw_tty *tty)
85{
86 char *iftype = tty_type_name(tty->tty_type);
87
88 printk(KERN_INFO IPWIRELESS_PCCARD_NAME
89 ": deregistering %s device ttyIPWp%d\n", iftype,
90 tty->index);
91}
92
93static struct ipw_tty *get_tty(int minor)
94{
95 if (minor < ipw_tty_driver->minor_start
96 || minor >= ipw_tty_driver->minor_start +
97 IPWIRELESS_PCMCIA_MINORS)
98 return NULL;
99 else {
100 int minor_offset = minor - ipw_tty_driver->minor_start;
101
102 /*
103 * The 'ras_raw' channel is only available when 'loopback' mode
104 * is enabled.
105 * Number of minor starts with 16 (_RANGE * _RAS_RAW).
106 */
107 if (!ipwireless_loopback &&
108 minor_offset >=
109 IPWIRELESS_PCMCIA_MINOR_RANGE * TTYTYPE_RAS_RAW)
110 return NULL;
111
112 return ttys[minor_offset];
113 }
114}
115
116static int ipw_open(struct tty_struct *linux_tty, struct file *filp)
117{
118 int minor = linux_tty->index;
119 struct ipw_tty *tty = get_tty(minor);
120
121 if (!tty)
122 return -ENODEV;
123
124 mutex_lock(&tty->ipw_tty_mutex);
125
126 if (tty->closing) {
127 mutex_unlock(&tty->ipw_tty_mutex);
128 return -ENODEV;
129 }
130 if (tty->open_count == 0)
131 tty->tx_bytes_queued = 0;
132
133 tty->open_count++;
134
135 tty->linux_tty = linux_tty;
136 linux_tty->driver_data = tty;
137 linux_tty->low_latency = 1;
138
139 if (tty->tty_type == TTYTYPE_MODEM)
140 ipwireless_ppp_open(tty->network);
141
142 mutex_unlock(&tty->ipw_tty_mutex);
143
144 return 0;
145}
146
147static void do_ipw_close(struct ipw_tty *tty)
148{
149 tty->open_count--;
150
151 if (tty->open_count == 0) {
152 struct tty_struct *linux_tty = tty->linux_tty;
153
154 if (linux_tty != NULL) {
155 tty->linux_tty = NULL;
156 linux_tty->driver_data = NULL;
157
158 if (tty->tty_type == TTYTYPE_MODEM)
159 ipwireless_ppp_close(tty->network);
160 }
161 }
162}
163
164static void ipw_hangup(struct tty_struct *linux_tty)
165{
166 struct ipw_tty *tty = linux_tty->driver_data;
167
168 if (!tty)
169 return;
170
171 mutex_lock(&tty->ipw_tty_mutex);
172 if (tty->open_count == 0) {
173 mutex_unlock(&tty->ipw_tty_mutex);
174 return;
175 }
176
177 do_ipw_close(tty);
178
179 mutex_unlock(&tty->ipw_tty_mutex);
180}
181
182static void ipw_close(struct tty_struct *linux_tty, struct file *filp)
183{
184 ipw_hangup(linux_tty);
185}
186
187/* Take data received from hardware, and send it out the tty */
188void ipwireless_tty_received(struct ipw_tty *tty, unsigned char *data,
189 unsigned int length)
190{
191 struct tty_struct *linux_tty;
192 int work = 0;
193
194 mutex_lock(&tty->ipw_tty_mutex);
195 linux_tty = tty->linux_tty;
196 if (linux_tty == NULL) {
197 mutex_unlock(&tty->ipw_tty_mutex);
198 return;
199 }
200
201 if (!tty->open_count) {
202 mutex_unlock(&tty->ipw_tty_mutex);
203 return;
204 }
205 mutex_unlock(&tty->ipw_tty_mutex);
206
207 work = tty_insert_flip_string(linux_tty, data, length);
208
209 if (work != length)
210 printk(KERN_DEBUG IPWIRELESS_PCCARD_NAME
211 ": %d chars not inserted to flip buffer!\n",
212 length - work);
213
214 /*
215 * This may sleep if ->low_latency is set
216 */
217 if (work)
218 tty_flip_buffer_push(linux_tty);
219}
220
221static void ipw_write_packet_sent_callback(void *callback_data,
222 unsigned int packet_length)
223{
224 struct ipw_tty *tty = callback_data;
225
226 /*
227 * Packet has been sent, so we subtract the number of bytes from our
228 * tally of outstanding TX bytes.
229 */
230 tty->tx_bytes_queued -= packet_length;
231}
232
233static int ipw_write(struct tty_struct *linux_tty,
234 const unsigned char *buf, int count)
235{
236 struct ipw_tty *tty = linux_tty->driver_data;
237 int room, ret;
238
239 if (!tty)
240 return -ENODEV;
241
242 mutex_lock(&tty->ipw_tty_mutex);
243 if (!tty->open_count) {
244 mutex_unlock(&tty->ipw_tty_mutex);
245 return -EINVAL;
246 }
247
248 room = IPWIRELESS_TX_QUEUE_SIZE - tty->tx_bytes_queued;
249 if (room < 0)
250 room = 0;
251 /* Don't allow caller to write any more than we have room for */
252 if (count > room)
253 count = room;
254
255 if (count == 0) {
256 mutex_unlock(&tty->ipw_tty_mutex);
257 return 0;
258 }
259
260 ret = ipwireless_send_packet(tty->hardware, IPW_CHANNEL_RAS,
261 buf, count,
262 ipw_write_packet_sent_callback, tty);
263 if (ret == -1) {
264 mutex_unlock(&tty->ipw_tty_mutex);
265 return 0;
266 }
267
268 tty->tx_bytes_queued += count;
269 mutex_unlock(&tty->ipw_tty_mutex);
270
271 return count;
272}
273
274static int ipw_write_room(struct tty_struct *linux_tty)
275{
276 struct ipw_tty *tty = linux_tty->driver_data;
277 int room;
278
279 /* FIXME: Exactly how is the tty object locked here .. */
280 if (!tty)
281 return -ENODEV;
282
283 if (!tty->open_count)
284 return -EINVAL;
285
286 room = IPWIRELESS_TX_QUEUE_SIZE - tty->tx_bytes_queued;
287 if (room < 0)
288 room = 0;
289
290 return room;
291}
292
293static int ipwireless_get_serial_info(struct ipw_tty *tty,
294 struct serial_struct __user *retinfo)
295{
296 struct serial_struct tmp;
297
298 if (!retinfo)
299 return (-EFAULT);
300
301 memset(&tmp, 0, sizeof(tmp));
302 tmp.type = PORT_UNKNOWN;
303 tmp.line = tty->index;
304 tmp.port = 0;
305 tmp.irq = 0;
306 tmp.flags = 0;
307 tmp.baud_base = 115200;
308 tmp.close_delay = 0;
309 tmp.closing_wait = 0;
310 tmp.custom_divisor = 0;
311 tmp.hub6 = 0;
312 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
313 return -EFAULT;
314
315 return 0;
316}
317
318static int ipw_chars_in_buffer(struct tty_struct *linux_tty)
319{
320 struct ipw_tty *tty = linux_tty->driver_data;
321
322 if (!tty)
323 return 0;
324
325 if (!tty->open_count)
326 return 0;
327
328 return tty->tx_bytes_queued;
329}
330
331static int get_control_lines(struct ipw_tty *tty)
332{
333 unsigned int my = tty->control_lines;
334 unsigned int out = 0;
335
336 if (my & IPW_CONTROL_LINE_RTS)
337 out |= TIOCM_RTS;
338 if (my & IPW_CONTROL_LINE_DTR)
339 out |= TIOCM_DTR;
340 if (my & IPW_CONTROL_LINE_CTS)
341 out |= TIOCM_CTS;
342 if (my & IPW_CONTROL_LINE_DSR)
343 out |= TIOCM_DSR;
344 if (my & IPW_CONTROL_LINE_DCD)
345 out |= TIOCM_CD;
346
347 return out;
348}
349
350static int set_control_lines(struct ipw_tty *tty, unsigned int set,
351 unsigned int clear)
352{
353 int ret;
354
355 if (set & TIOCM_RTS) {
356 ret = ipwireless_set_RTS(tty->hardware, tty->channel_idx, 1);
357 if (ret)
358 return ret;
359 if (tty->secondary_channel_idx != -1) {
360 ret = ipwireless_set_RTS(tty->hardware,
361 tty->secondary_channel_idx, 1);
362 if (ret)
363 return ret;
364 }
365 }
366 if (set & TIOCM_DTR) {
367 ret = ipwireless_set_DTR(tty->hardware, tty->channel_idx, 1);
368 if (ret)
369 return ret;
370 if (tty->secondary_channel_idx != -1) {
371 ret = ipwireless_set_DTR(tty->hardware,
372 tty->secondary_channel_idx, 1);
373 if (ret)
374 return ret;
375 }
376 }
377 if (clear & TIOCM_RTS) {
378 ret = ipwireless_set_RTS(tty->hardware, tty->channel_idx, 0);
379 if (tty->secondary_channel_idx != -1) {
380 ret = ipwireless_set_RTS(tty->hardware,
381 tty->secondary_channel_idx, 0);
382 if (ret)
383 return ret;
384 }
385 }
386 if (clear & TIOCM_DTR) {
387 ret = ipwireless_set_DTR(tty->hardware, tty->channel_idx, 0);
388 if (tty->secondary_channel_idx != -1) {
389 ret = ipwireless_set_DTR(tty->hardware,
390 tty->secondary_channel_idx, 0);
391 if (ret)
392 return ret;
393 }
394 }
395 return 0;
396}
397
398static int ipw_tiocmget(struct tty_struct *linux_tty)
399{
400 struct ipw_tty *tty = linux_tty->driver_data;
401 /* FIXME: Exactly how is the tty object locked here .. */
402
403 if (!tty)
404 return -ENODEV;
405
406 if (!tty->open_count)
407 return -EINVAL;
408
409 return get_control_lines(tty);
410}
411
412static int
413ipw_tiocmset(struct tty_struct *linux_tty,
414 unsigned int set, unsigned int clear)
415{
416 struct ipw_tty *tty = linux_tty->driver_data;
417 /* FIXME: Exactly how is the tty object locked here .. */
418
419 if (!tty)
420 return -ENODEV;
421
422 if (!tty->open_count)
423 return -EINVAL;
424
425 return set_control_lines(tty, set, clear);
426}
427
428static int ipw_ioctl(struct tty_struct *linux_tty,
429 unsigned int cmd, unsigned long arg)
430{
431 struct ipw_tty *tty = linux_tty->driver_data;
432
433 if (!tty)
434 return -ENODEV;
435
436 if (!tty->open_count)
437 return -EINVAL;
438
439 /* FIXME: Exactly how is the tty object locked here .. */
440
441 switch (cmd) {
442 case TIOCGSERIAL:
443 return ipwireless_get_serial_info(tty, (void __user *) arg);
444
445 case TIOCSSERIAL:
446 return 0; /* Keeps the PCMCIA scripts happy. */
447 }
448
449 if (tty->tty_type == TTYTYPE_MODEM) {
450 switch (cmd) {
451 case PPPIOCGCHAN:
452 {
453 int chan = ipwireless_ppp_channel_index(
454 tty->network);
455
456 if (chan < 0)
457 return -ENODEV;
458 if (put_user(chan, (int __user *) arg))
459 return -EFAULT;
460 }
461 return 0;
462
463 case PPPIOCGUNIT:
464 {
465 int unit = ipwireless_ppp_unit_number(
466 tty->network);
467
468 if (unit < 0)
469 return -ENODEV;
470 if (put_user(unit, (int __user *) arg))
471 return -EFAULT;
472 }
473 return 0;
474
475 case FIONREAD:
476 {
477 int val = 0;
478
479 if (put_user(val, (int __user *) arg))
480 return -EFAULT;
481 }
482 return 0;
483 case TCFLSH:
484 return tty_perform_flush(linux_tty, arg);
485 }
486 }
487 return -ENOIOCTLCMD;
488}
489
490static int add_tty(int j,
491 struct ipw_hardware *hardware,
492 struct ipw_network *network, int channel_idx,
493 int secondary_channel_idx, int tty_type)
494{
495 ttys[j] = kzalloc(sizeof(struct ipw_tty), GFP_KERNEL);
496 if (!ttys[j])
497 return -ENOMEM;
498 ttys[j]->index = j;
499 ttys[j]->hardware = hardware;
500 ttys[j]->channel_idx = channel_idx;
501 ttys[j]->secondary_channel_idx = secondary_channel_idx;
502 ttys[j]->network = network;
503 ttys[j]->tty_type = tty_type;
504 mutex_init(&ttys[j]->ipw_tty_mutex);
505
506 tty_register_device(ipw_tty_driver, j, NULL);
507 ipwireless_associate_network_tty(network, channel_idx, ttys[j]);
508
509 if (secondary_channel_idx != -1)
510 ipwireless_associate_network_tty(network,
511 secondary_channel_idx,
512 ttys[j]);
513 if (get_tty(j + ipw_tty_driver->minor_start) == ttys[j])
514 report_registering(ttys[j]);
515 return 0;
516}
517
518struct ipw_tty *ipwireless_tty_create(struct ipw_hardware *hardware,
519 struct ipw_network *network)
520{
521 int i, j;
522
523 for (i = 0; i < IPWIRELESS_PCMCIA_MINOR_RANGE; i++) {
524 int allfree = 1;
525
526 for (j = i; j < IPWIRELESS_PCMCIA_MINORS;
527 j += IPWIRELESS_PCMCIA_MINOR_RANGE)
528 if (ttys[j] != NULL) {
529 allfree = 0;
530 break;
531 }
532
533 if (allfree) {
534 j = i;
535
536 if (add_tty(j, hardware, network,
537 IPW_CHANNEL_DIALLER, IPW_CHANNEL_RAS,
538 TTYTYPE_MODEM))
539 return NULL;
540
541 j += IPWIRELESS_PCMCIA_MINOR_RANGE;
542 if (add_tty(j, hardware, network,
543 IPW_CHANNEL_DIALLER, -1,
544 TTYTYPE_MONITOR))
545 return NULL;
546
547 j += IPWIRELESS_PCMCIA_MINOR_RANGE;
548 if (add_tty(j, hardware, network,
549 IPW_CHANNEL_RAS, -1,
550 TTYTYPE_RAS_RAW))
551 return NULL;
552
553 return ttys[i];
554 }
555 }
556 return NULL;
557}
558
559/*
560 * Must be called before ipwireless_network_free().
561 */
562void ipwireless_tty_free(struct ipw_tty *tty)
563{
564 int j;
565 struct ipw_network *network = ttys[tty->index]->network;
566
567 for (j = tty->index; j < IPWIRELESS_PCMCIA_MINORS;
568 j += IPWIRELESS_PCMCIA_MINOR_RANGE) {
569 struct ipw_tty *ttyj = ttys[j];
570
571 if (ttyj) {
572 mutex_lock(&ttyj->ipw_tty_mutex);
573 if (get_tty(j + ipw_tty_driver->minor_start) == ttyj)
574 report_deregistering(ttyj);
575 ttyj->closing = 1;
576 if (ttyj->linux_tty != NULL) {
577 mutex_unlock(&ttyj->ipw_tty_mutex);
578 tty_hangup(ttyj->linux_tty);
579 /* Wait till the tty_hangup has completed */
580 flush_work_sync(&ttyj->linux_tty->hangup_work);
581 /* FIXME: Exactly how is the tty object locked here
582 against a parallel ioctl etc */
583 mutex_lock(&ttyj->ipw_tty_mutex);
584 }
585 while (ttyj->open_count)
586 do_ipw_close(ttyj);
587 ipwireless_disassociate_network_ttys(network,
588 ttyj->channel_idx);
589 tty_unregister_device(ipw_tty_driver, j);
590 ttys[j] = NULL;
591 mutex_unlock(&ttyj->ipw_tty_mutex);
592 kfree(ttyj);
593 }
594 }
595}
596
597static const struct tty_operations tty_ops = {
598 .open = ipw_open,
599 .close = ipw_close,
600 .hangup = ipw_hangup,
601 .write = ipw_write,
602 .write_room = ipw_write_room,
603 .ioctl = ipw_ioctl,
604 .chars_in_buffer = ipw_chars_in_buffer,
605 .tiocmget = ipw_tiocmget,
606 .tiocmset = ipw_tiocmset,
607};
608
609int ipwireless_tty_init(void)
610{
611 int result;
612
613 ipw_tty_driver = alloc_tty_driver(IPWIRELESS_PCMCIA_MINORS);
614 if (!ipw_tty_driver)
615 return -ENOMEM;
616
617 ipw_tty_driver->owner = THIS_MODULE;
618 ipw_tty_driver->driver_name = IPWIRELESS_PCCARD_NAME;
619 ipw_tty_driver->name = "ttyIPWp";
620 ipw_tty_driver->major = 0;
621 ipw_tty_driver->minor_start = IPWIRELESS_PCMCIA_START;
622 ipw_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
623 ipw_tty_driver->subtype = SERIAL_TYPE_NORMAL;
624 ipw_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
625 ipw_tty_driver->init_termios = tty_std_termios;
626 ipw_tty_driver->init_termios.c_cflag =
627 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
628 ipw_tty_driver->init_termios.c_ispeed = 9600;
629 ipw_tty_driver->init_termios.c_ospeed = 9600;
630 tty_set_operations(ipw_tty_driver, &tty_ops);
631 result = tty_register_driver(ipw_tty_driver);
632 if (result) {
633 printk(KERN_ERR IPWIRELESS_PCCARD_NAME
634 ": failed to register tty driver\n");
635 put_tty_driver(ipw_tty_driver);
636 return result;
637 }
638
639 return 0;
640}
641
642void ipwireless_tty_release(void)
643{
644 int ret;
645
646 ret = tty_unregister_driver(ipw_tty_driver);
647 put_tty_driver(ipw_tty_driver);
648 if (ret != 0)
649 printk(KERN_ERR IPWIRELESS_PCCARD_NAME
650 ": tty_unregister_driver failed with code %d\n", ret);
651}
652
653int ipwireless_tty_is_modem(struct ipw_tty *tty)
654{
655 return tty->tty_type == TTYTYPE_MODEM;
656}
657
658void
659ipwireless_tty_notify_control_line_change(struct ipw_tty *tty,
660 unsigned int channel_idx,
661 unsigned int control_lines,
662 unsigned int changed_mask)
663{
664 unsigned int old_control_lines = tty->control_lines;
665
666 tty->control_lines = (tty->control_lines & ~changed_mask)
667 | (control_lines & changed_mask);
668
669 /*
670 * If DCD is de-asserted, we close the tty so pppd can tell that we
671 * have gone offline.
672 */
673 if ((old_control_lines & IPW_CONTROL_LINE_DCD)
674 && !(tty->control_lines & IPW_CONTROL_LINE_DCD)
675 && tty->linux_tty) {
676 tty_hangup(tty->linux_tty);
677 }
678}
679
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * IPWireless 3G PCMCIA Network Driver
4 *
5 * Original code
6 * by Stephen Blackheath <stephen@blacksapphire.com>,
7 * Ben Martel <benm@symmetric.co.nz>
8 *
9 * Copyrighted as follows:
10 * Copyright (C) 2004 by Symmetric Systems Ltd (NZ)
11 *
12 * Various driver changes and rewrites, port to new kernels
13 * Copyright (C) 2006-2007 Jiri Kosina
14 *
15 * Misc code cleanups and updates
16 * Copyright (C) 2007 David Sterba
17 */
18
19#include <linux/kernel.h>
20#include <linux/module.h>
21#include <linux/mutex.h>
22#include <linux/ppp_defs.h>
23#include <linux/if.h>
24#include <linux/ppp-ioctl.h>
25#include <linux/sched.h>
26#include <linux/serial.h>
27#include <linux/slab.h>
28#include <linux/tty.h>
29#include <linux/tty_driver.h>
30#include <linux/tty_flip.h>
31#include <linux/uaccess.h>
32
33#include "tty.h"
34#include "network.h"
35#include "hardware.h"
36#include "main.h"
37
38#define IPWIRELESS_PCMCIA_START (0)
39#define IPWIRELESS_PCMCIA_MINORS (24)
40#define IPWIRELESS_PCMCIA_MINOR_RANGE (8)
41
42#define TTYTYPE_MODEM (0)
43#define TTYTYPE_MONITOR (1)
44#define TTYTYPE_RAS_RAW (2)
45
46struct ipw_tty {
47 struct tty_port port;
48 int index;
49 struct ipw_hardware *hardware;
50 unsigned int channel_idx;
51 unsigned int secondary_channel_idx;
52 int tty_type;
53 struct ipw_network *network;
54 unsigned int control_lines;
55 struct mutex ipw_tty_mutex;
56 int tx_bytes_queued;
57 int closing;
58};
59
60static struct ipw_tty *ttys[IPWIRELESS_PCMCIA_MINORS];
61
62static struct tty_driver *ipw_tty_driver;
63
64static char *tty_type_name(int tty_type)
65{
66 static char *channel_names[] = {
67 "modem",
68 "monitor",
69 "RAS-raw"
70 };
71
72 return channel_names[tty_type];
73}
74
75static struct ipw_tty *get_tty(int index)
76{
77 /*
78 * The 'ras_raw' channel is only available when 'loopback' mode
79 * is enabled.
80 * Number of minor starts with 16 (_RANGE * _RAS_RAW).
81 */
82 if (!ipwireless_loopback && index >=
83 IPWIRELESS_PCMCIA_MINOR_RANGE * TTYTYPE_RAS_RAW)
84 return NULL;
85
86 return ttys[index];
87}
88
89static int ipw_open(struct tty_struct *linux_tty, struct file *filp)
90{
91 struct ipw_tty *tty = get_tty(linux_tty->index);
92
93 if (!tty)
94 return -ENODEV;
95
96 mutex_lock(&tty->ipw_tty_mutex);
97 if (tty->port.count == 0)
98 tty->tx_bytes_queued = 0;
99
100 tty->port.count++;
101
102 tty->port.tty = linux_tty;
103 linux_tty->driver_data = tty;
104 tty->port.low_latency = 1;
105
106 if (tty->tty_type == TTYTYPE_MODEM)
107 ipwireless_ppp_open(tty->network);
108
109 mutex_unlock(&tty->ipw_tty_mutex);
110
111 return 0;
112}
113
114static void do_ipw_close(struct ipw_tty *tty)
115{
116 tty->port.count--;
117
118 if (tty->port.count == 0) {
119 struct tty_struct *linux_tty = tty->port.tty;
120
121 if (linux_tty != NULL) {
122 tty->port.tty = NULL;
123 linux_tty->driver_data = NULL;
124
125 if (tty->tty_type == TTYTYPE_MODEM)
126 ipwireless_ppp_close(tty->network);
127 }
128 }
129}
130
131static void ipw_hangup(struct tty_struct *linux_tty)
132{
133 struct ipw_tty *tty = linux_tty->driver_data;
134
135 if (!tty)
136 return;
137
138 mutex_lock(&tty->ipw_tty_mutex);
139 if (tty->port.count == 0) {
140 mutex_unlock(&tty->ipw_tty_mutex);
141 return;
142 }
143
144 do_ipw_close(tty);
145
146 mutex_unlock(&tty->ipw_tty_mutex);
147}
148
149static void ipw_close(struct tty_struct *linux_tty, struct file *filp)
150{
151 ipw_hangup(linux_tty);
152}
153
154/* Take data received from hardware, and send it out the tty */
155void ipwireless_tty_received(struct ipw_tty *tty, unsigned char *data,
156 unsigned int length)
157{
158 int work = 0;
159
160 mutex_lock(&tty->ipw_tty_mutex);
161
162 if (!tty->port.count) {
163 mutex_unlock(&tty->ipw_tty_mutex);
164 return;
165 }
166 mutex_unlock(&tty->ipw_tty_mutex);
167
168 work = tty_insert_flip_string(&tty->port, data, length);
169
170 if (work != length)
171 printk(KERN_DEBUG IPWIRELESS_PCCARD_NAME
172 ": %d chars not inserted to flip buffer!\n",
173 length - work);
174
175 if (work)
176 tty_flip_buffer_push(&tty->port);
177}
178
179static void ipw_write_packet_sent_callback(void *callback_data,
180 unsigned int packet_length)
181{
182 struct ipw_tty *tty = callback_data;
183
184 /*
185 * Packet has been sent, so we subtract the number of bytes from our
186 * tally of outstanding TX bytes.
187 */
188 tty->tx_bytes_queued -= packet_length;
189}
190
191static int ipw_write(struct tty_struct *linux_tty,
192 const unsigned char *buf, int count)
193{
194 struct ipw_tty *tty = linux_tty->driver_data;
195 int room, ret;
196
197 if (!tty)
198 return -ENODEV;
199
200 mutex_lock(&tty->ipw_tty_mutex);
201 if (!tty->port.count) {
202 mutex_unlock(&tty->ipw_tty_mutex);
203 return -EINVAL;
204 }
205
206 room = IPWIRELESS_TX_QUEUE_SIZE - tty->tx_bytes_queued;
207 if (room < 0)
208 room = 0;
209 /* Don't allow caller to write any more than we have room for */
210 if (count > room)
211 count = room;
212
213 if (count == 0) {
214 mutex_unlock(&tty->ipw_tty_mutex);
215 return 0;
216 }
217
218 ret = ipwireless_send_packet(tty->hardware, IPW_CHANNEL_RAS,
219 buf, count,
220 ipw_write_packet_sent_callback, tty);
221 if (ret == -1) {
222 mutex_unlock(&tty->ipw_tty_mutex);
223 return 0;
224 }
225
226 tty->tx_bytes_queued += count;
227 mutex_unlock(&tty->ipw_tty_mutex);
228
229 return count;
230}
231
232static int ipw_write_room(struct tty_struct *linux_tty)
233{
234 struct ipw_tty *tty = linux_tty->driver_data;
235 int room;
236
237 /* FIXME: Exactly how is the tty object locked here .. */
238 if (!tty)
239 return -ENODEV;
240
241 if (!tty->port.count)
242 return -EINVAL;
243
244 room = IPWIRELESS_TX_QUEUE_SIZE - tty->tx_bytes_queued;
245 if (room < 0)
246 room = 0;
247
248 return room;
249}
250
251static int ipwireless_get_serial_info(struct tty_struct *linux_tty,
252 struct serial_struct *ss)
253{
254 struct ipw_tty *tty = linux_tty->driver_data;
255
256 if (!tty)
257 return -ENODEV;
258
259 if (!tty->port.count)
260 return -EINVAL;
261
262 ss->type = PORT_UNKNOWN;
263 ss->line = tty->index;
264 ss->baud_base = 115200;
265 return 0;
266}
267
268static int ipwireless_set_serial_info(struct tty_struct *linux_tty,
269 struct serial_struct *ss)
270{
271 return 0; /* Keeps the PCMCIA scripts happy. */
272}
273
274static int ipw_chars_in_buffer(struct tty_struct *linux_tty)
275{
276 struct ipw_tty *tty = linux_tty->driver_data;
277
278 if (!tty)
279 return 0;
280
281 if (!tty->port.count)
282 return 0;
283
284 return tty->tx_bytes_queued;
285}
286
287static int get_control_lines(struct ipw_tty *tty)
288{
289 unsigned int my = tty->control_lines;
290 unsigned int out = 0;
291
292 if (my & IPW_CONTROL_LINE_RTS)
293 out |= TIOCM_RTS;
294 if (my & IPW_CONTROL_LINE_DTR)
295 out |= TIOCM_DTR;
296 if (my & IPW_CONTROL_LINE_CTS)
297 out |= TIOCM_CTS;
298 if (my & IPW_CONTROL_LINE_DSR)
299 out |= TIOCM_DSR;
300 if (my & IPW_CONTROL_LINE_DCD)
301 out |= TIOCM_CD;
302
303 return out;
304}
305
306static int set_control_lines(struct ipw_tty *tty, unsigned int set,
307 unsigned int clear)
308{
309 int ret;
310
311 if (set & TIOCM_RTS) {
312 ret = ipwireless_set_RTS(tty->hardware, tty->channel_idx, 1);
313 if (ret)
314 return ret;
315 if (tty->secondary_channel_idx != -1) {
316 ret = ipwireless_set_RTS(tty->hardware,
317 tty->secondary_channel_idx, 1);
318 if (ret)
319 return ret;
320 }
321 }
322 if (set & TIOCM_DTR) {
323 ret = ipwireless_set_DTR(tty->hardware, tty->channel_idx, 1);
324 if (ret)
325 return ret;
326 if (tty->secondary_channel_idx != -1) {
327 ret = ipwireless_set_DTR(tty->hardware,
328 tty->secondary_channel_idx, 1);
329 if (ret)
330 return ret;
331 }
332 }
333 if (clear & TIOCM_RTS) {
334 ret = ipwireless_set_RTS(tty->hardware, tty->channel_idx, 0);
335 if (tty->secondary_channel_idx != -1) {
336 ret = ipwireless_set_RTS(tty->hardware,
337 tty->secondary_channel_idx, 0);
338 if (ret)
339 return ret;
340 }
341 }
342 if (clear & TIOCM_DTR) {
343 ret = ipwireless_set_DTR(tty->hardware, tty->channel_idx, 0);
344 if (tty->secondary_channel_idx != -1) {
345 ret = ipwireless_set_DTR(tty->hardware,
346 tty->secondary_channel_idx, 0);
347 if (ret)
348 return ret;
349 }
350 }
351 return 0;
352}
353
354static int ipw_tiocmget(struct tty_struct *linux_tty)
355{
356 struct ipw_tty *tty = linux_tty->driver_data;
357 /* FIXME: Exactly how is the tty object locked here .. */
358
359 if (!tty)
360 return -ENODEV;
361
362 if (!tty->port.count)
363 return -EINVAL;
364
365 return get_control_lines(tty);
366}
367
368static int
369ipw_tiocmset(struct tty_struct *linux_tty,
370 unsigned int set, unsigned int clear)
371{
372 struct ipw_tty *tty = linux_tty->driver_data;
373 /* FIXME: Exactly how is the tty object locked here .. */
374
375 if (!tty)
376 return -ENODEV;
377
378 if (!tty->port.count)
379 return -EINVAL;
380
381 return set_control_lines(tty, set, clear);
382}
383
384static int ipw_ioctl(struct tty_struct *linux_tty,
385 unsigned int cmd, unsigned long arg)
386{
387 struct ipw_tty *tty = linux_tty->driver_data;
388
389 if (!tty)
390 return -ENODEV;
391
392 if (!tty->port.count)
393 return -EINVAL;
394
395 /* FIXME: Exactly how is the tty object locked here .. */
396 if (tty->tty_type == TTYTYPE_MODEM) {
397 switch (cmd) {
398 case PPPIOCGCHAN:
399 {
400 int chan = ipwireless_ppp_channel_index(
401 tty->network);
402
403 if (chan < 0)
404 return -ENODEV;
405 if (put_user(chan, (int __user *) arg))
406 return -EFAULT;
407 }
408 return 0;
409
410 case PPPIOCGUNIT:
411 {
412 int unit = ipwireless_ppp_unit_number(
413 tty->network);
414
415 if (unit < 0)
416 return -ENODEV;
417 if (put_user(unit, (int __user *) arg))
418 return -EFAULT;
419 }
420 return 0;
421
422 case FIONREAD:
423 {
424 int val = 0;
425
426 if (put_user(val, (int __user *) arg))
427 return -EFAULT;
428 }
429 return 0;
430 case TCFLSH:
431 return tty_perform_flush(linux_tty, arg);
432 }
433 }
434 return -ENOIOCTLCMD;
435}
436
437static int add_tty(int j,
438 struct ipw_hardware *hardware,
439 struct ipw_network *network, int channel_idx,
440 int secondary_channel_idx, int tty_type)
441{
442 ttys[j] = kzalloc(sizeof(struct ipw_tty), GFP_KERNEL);
443 if (!ttys[j])
444 return -ENOMEM;
445 ttys[j]->index = j;
446 ttys[j]->hardware = hardware;
447 ttys[j]->channel_idx = channel_idx;
448 ttys[j]->secondary_channel_idx = secondary_channel_idx;
449 ttys[j]->network = network;
450 ttys[j]->tty_type = tty_type;
451 mutex_init(&ttys[j]->ipw_tty_mutex);
452 tty_port_init(&ttys[j]->port);
453
454 tty_port_register_device(&ttys[j]->port, ipw_tty_driver, j, NULL);
455 ipwireless_associate_network_tty(network, channel_idx, ttys[j]);
456
457 if (secondary_channel_idx != -1)
458 ipwireless_associate_network_tty(network,
459 secondary_channel_idx,
460 ttys[j]);
461 /* check if we provide raw device (if loopback is enabled) */
462 if (get_tty(j))
463 printk(KERN_INFO IPWIRELESS_PCCARD_NAME
464 ": registering %s device ttyIPWp%d\n",
465 tty_type_name(tty_type), j);
466
467 return 0;
468}
469
470struct ipw_tty *ipwireless_tty_create(struct ipw_hardware *hardware,
471 struct ipw_network *network)
472{
473 int i, j;
474
475 for (i = 0; i < IPWIRELESS_PCMCIA_MINOR_RANGE; i++) {
476 int allfree = 1;
477
478 for (j = i; j < IPWIRELESS_PCMCIA_MINORS;
479 j += IPWIRELESS_PCMCIA_MINOR_RANGE)
480 if (ttys[j] != NULL) {
481 allfree = 0;
482 break;
483 }
484
485 if (allfree) {
486 j = i;
487
488 if (add_tty(j, hardware, network,
489 IPW_CHANNEL_DIALLER, IPW_CHANNEL_RAS,
490 TTYTYPE_MODEM))
491 return NULL;
492
493 j += IPWIRELESS_PCMCIA_MINOR_RANGE;
494 if (add_tty(j, hardware, network,
495 IPW_CHANNEL_DIALLER, -1,
496 TTYTYPE_MONITOR))
497 return NULL;
498
499 j += IPWIRELESS_PCMCIA_MINOR_RANGE;
500 if (add_tty(j, hardware, network,
501 IPW_CHANNEL_RAS, -1,
502 TTYTYPE_RAS_RAW))
503 return NULL;
504
505 return ttys[i];
506 }
507 }
508 return NULL;
509}
510
511/*
512 * Must be called before ipwireless_network_free().
513 */
514void ipwireless_tty_free(struct ipw_tty *tty)
515{
516 int j;
517 struct ipw_network *network = ttys[tty->index]->network;
518
519 for (j = tty->index; j < IPWIRELESS_PCMCIA_MINORS;
520 j += IPWIRELESS_PCMCIA_MINOR_RANGE) {
521 struct ipw_tty *ttyj = ttys[j];
522
523 if (ttyj) {
524 mutex_lock(&ttyj->ipw_tty_mutex);
525 if (get_tty(j))
526 printk(KERN_INFO IPWIRELESS_PCCARD_NAME
527 ": deregistering %s device ttyIPWp%d\n",
528 tty_type_name(ttyj->tty_type), j);
529 ttyj->closing = 1;
530 if (ttyj->port.tty != NULL) {
531 mutex_unlock(&ttyj->ipw_tty_mutex);
532 tty_vhangup(ttyj->port.tty);
533 /* FIXME: Exactly how is the tty object locked here
534 against a parallel ioctl etc */
535 /* FIXME2: hangup does not mean all processes
536 * are gone */
537 mutex_lock(&ttyj->ipw_tty_mutex);
538 }
539 while (ttyj->port.count)
540 do_ipw_close(ttyj);
541 ipwireless_disassociate_network_ttys(network,
542 ttyj->channel_idx);
543 tty_unregister_device(ipw_tty_driver, j);
544 tty_port_destroy(&ttyj->port);
545 ttys[j] = NULL;
546 mutex_unlock(&ttyj->ipw_tty_mutex);
547 kfree(ttyj);
548 }
549 }
550}
551
552static const struct tty_operations tty_ops = {
553 .open = ipw_open,
554 .close = ipw_close,
555 .hangup = ipw_hangup,
556 .write = ipw_write,
557 .write_room = ipw_write_room,
558 .ioctl = ipw_ioctl,
559 .chars_in_buffer = ipw_chars_in_buffer,
560 .tiocmget = ipw_tiocmget,
561 .tiocmset = ipw_tiocmset,
562 .set_serial = ipwireless_set_serial_info,
563 .get_serial = ipwireless_get_serial_info,
564};
565
566int ipwireless_tty_init(void)
567{
568 int result;
569
570 ipw_tty_driver = alloc_tty_driver(IPWIRELESS_PCMCIA_MINORS);
571 if (!ipw_tty_driver)
572 return -ENOMEM;
573
574 ipw_tty_driver->driver_name = IPWIRELESS_PCCARD_NAME;
575 ipw_tty_driver->name = "ttyIPWp";
576 ipw_tty_driver->major = 0;
577 ipw_tty_driver->minor_start = IPWIRELESS_PCMCIA_START;
578 ipw_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
579 ipw_tty_driver->subtype = SERIAL_TYPE_NORMAL;
580 ipw_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
581 ipw_tty_driver->init_termios = tty_std_termios;
582 ipw_tty_driver->init_termios.c_cflag =
583 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
584 ipw_tty_driver->init_termios.c_ispeed = 9600;
585 ipw_tty_driver->init_termios.c_ospeed = 9600;
586 tty_set_operations(ipw_tty_driver, &tty_ops);
587 result = tty_register_driver(ipw_tty_driver);
588 if (result) {
589 printk(KERN_ERR IPWIRELESS_PCCARD_NAME
590 ": failed to register tty driver\n");
591 put_tty_driver(ipw_tty_driver);
592 return result;
593 }
594
595 return 0;
596}
597
598void ipwireless_tty_release(void)
599{
600 int ret;
601
602 ret = tty_unregister_driver(ipw_tty_driver);
603 put_tty_driver(ipw_tty_driver);
604 if (ret != 0)
605 printk(KERN_ERR IPWIRELESS_PCCARD_NAME
606 ": tty_unregister_driver failed with code %d\n", ret);
607}
608
609int ipwireless_tty_is_modem(struct ipw_tty *tty)
610{
611 return tty->tty_type == TTYTYPE_MODEM;
612}
613
614void
615ipwireless_tty_notify_control_line_change(struct ipw_tty *tty,
616 unsigned int channel_idx,
617 unsigned int control_lines,
618 unsigned int changed_mask)
619{
620 unsigned int old_control_lines = tty->control_lines;
621
622 tty->control_lines = (tty->control_lines & ~changed_mask)
623 | (control_lines & changed_mask);
624
625 /*
626 * If DCD is de-asserted, we close the tty so pppd can tell that we
627 * have gone offline.
628 */
629 if ((old_control_lines & IPW_CONTROL_LINE_DCD)
630 && !(tty->control_lines & IPW_CONTROL_LINE_DCD)
631 && tty->port.tty) {
632 tty_hangup(tty->port.tty);
633 }
634}
635