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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};
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 * The 'ras_raw' channel is only available when 'loopback' mode
78 * is enabled.
79 * Number of minor starts with 16 (_RANGE * _RAS_RAW).
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
104 if (tty->tty_type == TTYTYPE_MODEM)
105 ipwireless_ppp_open(tty->network);
106
107 mutex_unlock(&tty->ipw_tty_mutex);
108
109 return 0;
110}
111
112static void do_ipw_close(struct ipw_tty *tty)
113{
114 tty->port.count--;
115
116 if (tty->port.count == 0) {
117 struct tty_struct *linux_tty = tty->port.tty;
118
119 if (linux_tty != NULL) {
120 tty->port.tty = NULL;
121 linux_tty->driver_data = NULL;
122
123 if (tty->tty_type == TTYTYPE_MODEM)
124 ipwireless_ppp_close(tty->network);
125 }
126 }
127}
128
129static void ipw_hangup(struct tty_struct *linux_tty)
130{
131 struct ipw_tty *tty = linux_tty->driver_data;
132
133 if (!tty)
134 return;
135
136 mutex_lock(&tty->ipw_tty_mutex);
137 if (tty->port.count == 0) {
138 mutex_unlock(&tty->ipw_tty_mutex);
139 return;
140 }
141
142 do_ipw_close(tty);
143
144 mutex_unlock(&tty->ipw_tty_mutex);
145}
146
147static void ipw_close(struct tty_struct *linux_tty, struct file *filp)
148{
149 ipw_hangup(linux_tty);
150}
151
152/* Take data received from hardware, and send it out the tty */
153void ipwireless_tty_received(struct ipw_tty *tty, unsigned char *data,
154 unsigned int length)
155{
156 int work = 0;
157
158 mutex_lock(&tty->ipw_tty_mutex);
159
160 if (!tty->port.count) {
161 mutex_unlock(&tty->ipw_tty_mutex);
162 return;
163 }
164 mutex_unlock(&tty->ipw_tty_mutex);
165
166 work = tty_insert_flip_string(&tty->port, data, length);
167
168 if (work != length)
169 printk(KERN_DEBUG IPWIRELESS_PCCARD_NAME
170 ": %d chars not inserted to flip buffer!\n",
171 length - work);
172
173 if (work)
174 tty_flip_buffer_push(&tty->port);
175}
176
177static void ipw_write_packet_sent_callback(void *callback_data,
178 unsigned int packet_length)
179{
180 struct ipw_tty *tty = callback_data;
181
182 /*
183 * Packet has been sent, so we subtract the number of bytes from our
184 * tally of outstanding TX bytes.
185 */
186 tty->tx_bytes_queued -= packet_length;
187}
188
189static int ipw_write(struct tty_struct *linux_tty,
190 const unsigned char *buf, int count)
191{
192 struct ipw_tty *tty = linux_tty->driver_data;
193 int room, ret;
194
195 if (!tty)
196 return -ENODEV;
197
198 mutex_lock(&tty->ipw_tty_mutex);
199 if (!tty->port.count) {
200 mutex_unlock(&tty->ipw_tty_mutex);
201 return -EINVAL;
202 }
203
204 room = IPWIRELESS_TX_QUEUE_SIZE - tty->tx_bytes_queued;
205 if (room < 0)
206 room = 0;
207 /* Don't allow caller to write any more than we have room for */
208 if (count > room)
209 count = room;
210
211 if (count == 0) {
212 mutex_unlock(&tty->ipw_tty_mutex);
213 return 0;
214 }
215
216 ret = ipwireless_send_packet(tty->hardware, IPW_CHANNEL_RAS,
217 buf, count,
218 ipw_write_packet_sent_callback, tty);
219 if (ret < 0) {
220 mutex_unlock(&tty->ipw_tty_mutex);
221 return 0;
222 }
223
224 tty->tx_bytes_queued += count;
225 mutex_unlock(&tty->ipw_tty_mutex);
226
227 return count;
228}
229
230static unsigned int ipw_write_room(struct tty_struct *linux_tty)
231{
232 struct ipw_tty *tty = linux_tty->driver_data;
233 int room;
234
235 /* FIXME: Exactly how is the tty object locked here .. */
236 if (!tty)
237 return 0;
238
239 if (!tty->port.count)
240 return 0;
241
242 room = IPWIRELESS_TX_QUEUE_SIZE - tty->tx_bytes_queued;
243 if (room < 0)
244 room = 0;
245
246 return room;
247}
248
249static int ipwireless_get_serial_info(struct tty_struct *linux_tty,
250 struct serial_struct *ss)
251{
252 struct ipw_tty *tty = linux_tty->driver_data;
253
254 if (!tty)
255 return -ENODEV;
256
257 if (!tty->port.count)
258 return -EINVAL;
259
260 ss->type = PORT_UNKNOWN;
261 ss->line = tty->index;
262 ss->baud_base = 115200;
263 return 0;
264}
265
266static int ipwireless_set_serial_info(struct tty_struct *linux_tty,
267 struct serial_struct *ss)
268{
269 return 0; /* Keeps the PCMCIA scripts happy. */
270}
271
272static unsigned int ipw_chars_in_buffer(struct tty_struct *linux_tty)
273{
274 struct ipw_tty *tty = linux_tty->driver_data;
275
276 if (!tty)
277 return 0;
278
279 if (!tty->port.count)
280 return 0;
281
282 return tty->tx_bytes_queued;
283}
284
285static int get_control_lines(struct ipw_tty *tty)
286{
287 unsigned int my = tty->control_lines;
288 unsigned int out = 0;
289
290 if (my & IPW_CONTROL_LINE_RTS)
291 out |= TIOCM_RTS;
292 if (my & IPW_CONTROL_LINE_DTR)
293 out |= TIOCM_DTR;
294 if (my & IPW_CONTROL_LINE_CTS)
295 out |= TIOCM_CTS;
296 if (my & IPW_CONTROL_LINE_DSR)
297 out |= TIOCM_DSR;
298 if (my & IPW_CONTROL_LINE_DCD)
299 out |= TIOCM_CD;
300
301 return out;
302}
303
304static int set_control_lines(struct ipw_tty *tty, unsigned int set,
305 unsigned int clear)
306{
307 int ret;
308
309 if (set & TIOCM_RTS) {
310 ret = ipwireless_set_RTS(tty->hardware, tty->channel_idx, 1);
311 if (ret)
312 return ret;
313 if (tty->secondary_channel_idx != -1) {
314 ret = ipwireless_set_RTS(tty->hardware,
315 tty->secondary_channel_idx, 1);
316 if (ret)
317 return ret;
318 }
319 }
320 if (set & TIOCM_DTR) {
321 ret = ipwireless_set_DTR(tty->hardware, tty->channel_idx, 1);
322 if (ret)
323 return ret;
324 if (tty->secondary_channel_idx != -1) {
325 ret = ipwireless_set_DTR(tty->hardware,
326 tty->secondary_channel_idx, 1);
327 if (ret)
328 return ret;
329 }
330 }
331 if (clear & TIOCM_RTS) {
332 ret = ipwireless_set_RTS(tty->hardware, tty->channel_idx, 0);
333 if (tty->secondary_channel_idx != -1) {
334 ret = ipwireless_set_RTS(tty->hardware,
335 tty->secondary_channel_idx, 0);
336 if (ret)
337 return ret;
338 }
339 }
340 if (clear & TIOCM_DTR) {
341 ret = ipwireless_set_DTR(tty->hardware, tty->channel_idx, 0);
342 if (tty->secondary_channel_idx != -1) {
343 ret = ipwireless_set_DTR(tty->hardware,
344 tty->secondary_channel_idx, 0);
345 if (ret)
346 return ret;
347 }
348 }
349 return 0;
350}
351
352static int ipw_tiocmget(struct tty_struct *linux_tty)
353{
354 struct ipw_tty *tty = linux_tty->driver_data;
355 /* FIXME: Exactly how is the tty object locked here .. */
356
357 if (!tty)
358 return -ENODEV;
359
360 if (!tty->port.count)
361 return -EINVAL;
362
363 return get_control_lines(tty);
364}
365
366static int
367ipw_tiocmset(struct tty_struct *linux_tty,
368 unsigned int set, unsigned int clear)
369{
370 struct ipw_tty *tty = linux_tty->driver_data;
371 /* FIXME: Exactly how is the tty object locked here .. */
372
373 if (!tty)
374 return -ENODEV;
375
376 if (!tty->port.count)
377 return -EINVAL;
378
379 return set_control_lines(tty, set, clear);
380}
381
382static int ipw_ioctl(struct tty_struct *linux_tty,
383 unsigned int cmd, unsigned long arg)
384{
385 struct ipw_tty *tty = linux_tty->driver_data;
386
387 if (!tty)
388 return -ENODEV;
389
390 if (!tty->port.count)
391 return -EINVAL;
392
393 /* FIXME: Exactly how is the tty object locked here .. */
394 if (tty->tty_type == TTYTYPE_MODEM) {
395 switch (cmd) {
396 case PPPIOCGCHAN:
397 {
398 int chan = ipwireless_ppp_channel_index(
399 tty->network);
400
401 if (chan < 0)
402 return -ENODEV;
403 if (put_user(chan, (int __user *) arg))
404 return -EFAULT;
405 }
406 return 0;
407
408 case PPPIOCGUNIT:
409 {
410 int unit = ipwireless_ppp_unit_number(
411 tty->network);
412
413 if (unit < 0)
414 return -ENODEV;
415 if (put_user(unit, (int __user *) arg))
416 return -EFAULT;
417 }
418 return 0;
419
420 case FIONREAD:
421 {
422 int val = 0;
423
424 if (put_user(val, (int __user *) arg))
425 return -EFAULT;
426 }
427 return 0;
428 case TCFLSH:
429 return tty_perform_flush(linux_tty, arg);
430 }
431 }
432 return -ENOIOCTLCMD;
433}
434
435static int add_tty(int j,
436 struct ipw_hardware *hardware,
437 struct ipw_network *network, int channel_idx,
438 int secondary_channel_idx, int tty_type)
439{
440 ttys[j] = kzalloc(sizeof(struct ipw_tty), GFP_KERNEL);
441 if (!ttys[j])
442 return -ENOMEM;
443 ttys[j]->index = j;
444 ttys[j]->hardware = hardware;
445 ttys[j]->channel_idx = channel_idx;
446 ttys[j]->secondary_channel_idx = secondary_channel_idx;
447 ttys[j]->network = network;
448 ttys[j]->tty_type = tty_type;
449 mutex_init(&ttys[j]->ipw_tty_mutex);
450 tty_port_init(&ttys[j]->port);
451
452 tty_port_register_device(&ttys[j]->port, ipw_tty_driver, j, NULL);
453 ipwireless_associate_network_tty(network, channel_idx, ttys[j]);
454
455 if (secondary_channel_idx != -1)
456 ipwireless_associate_network_tty(network,
457 secondary_channel_idx,
458 ttys[j]);
459 /* check if we provide raw device (if loopback is enabled) */
460 if (get_tty(j))
461 printk(KERN_INFO IPWIRELESS_PCCARD_NAME
462 ": registering %s device ttyIPWp%d\n",
463 tty_type_name(tty_type), j);
464
465 return 0;
466}
467
468struct ipw_tty *ipwireless_tty_create(struct ipw_hardware *hardware,
469 struct ipw_network *network)
470{
471 int i, j;
472
473 for (i = 0; i < IPWIRELESS_PCMCIA_MINOR_RANGE; i++) {
474 int allfree = 1;
475
476 for (j = i; j < IPWIRELESS_PCMCIA_MINORS;
477 j += IPWIRELESS_PCMCIA_MINOR_RANGE)
478 if (ttys[j] != NULL) {
479 allfree = 0;
480 break;
481 }
482
483 if (allfree) {
484 j = i;
485
486 if (add_tty(j, hardware, network,
487 IPW_CHANNEL_DIALLER, IPW_CHANNEL_RAS,
488 TTYTYPE_MODEM))
489 return NULL;
490
491 j += IPWIRELESS_PCMCIA_MINOR_RANGE;
492 if (add_tty(j, hardware, network,
493 IPW_CHANNEL_DIALLER, -1,
494 TTYTYPE_MONITOR))
495 return NULL;
496
497 j += IPWIRELESS_PCMCIA_MINOR_RANGE;
498 if (add_tty(j, hardware, network,
499 IPW_CHANNEL_RAS, -1,
500 TTYTYPE_RAS_RAW))
501 return NULL;
502
503 return ttys[i];
504 }
505 }
506 return NULL;
507}
508
509/*
510 * Must be called before ipwireless_network_free().
511 */
512void ipwireless_tty_free(struct ipw_tty *tty)
513{
514 int j;
515 struct ipw_network *network = ttys[tty->index]->network;
516
517 for (j = tty->index; j < IPWIRELESS_PCMCIA_MINORS;
518 j += IPWIRELESS_PCMCIA_MINOR_RANGE) {
519 struct ipw_tty *ttyj = ttys[j];
520
521 if (ttyj) {
522 mutex_lock(&ttyj->ipw_tty_mutex);
523 if (get_tty(j))
524 printk(KERN_INFO IPWIRELESS_PCCARD_NAME
525 ": deregistering %s device ttyIPWp%d\n",
526 tty_type_name(ttyj->tty_type), j);
527 if (ttyj->port.tty != NULL) {
528 mutex_unlock(&ttyj->ipw_tty_mutex);
529 tty_vhangup(ttyj->port.tty);
530 /* FIXME: Exactly how is the tty object locked here
531 against a parallel ioctl etc */
532 /* FIXME2: hangup does not mean all processes
533 * are gone */
534 mutex_lock(&ttyj->ipw_tty_mutex);
535 }
536 while (ttyj->port.count)
537 do_ipw_close(ttyj);
538 ipwireless_disassociate_network_ttys(network,
539 ttyj->channel_idx);
540 tty_unregister_device(ipw_tty_driver, j);
541 tty_port_destroy(&ttyj->port);
542 ttys[j] = NULL;
543 mutex_unlock(&ttyj->ipw_tty_mutex);
544 kfree(ttyj);
545 }
546 }
547}
548
549static const struct tty_operations tty_ops = {
550 .open = ipw_open,
551 .close = ipw_close,
552 .hangup = ipw_hangup,
553 .write = ipw_write,
554 .write_room = ipw_write_room,
555 .ioctl = ipw_ioctl,
556 .chars_in_buffer = ipw_chars_in_buffer,
557 .tiocmget = ipw_tiocmget,
558 .tiocmset = ipw_tiocmset,
559 .set_serial = ipwireless_set_serial_info,
560 .get_serial = ipwireless_get_serial_info,
561};
562
563int ipwireless_tty_init(void)
564{
565 int result;
566
567 ipw_tty_driver = alloc_tty_driver(IPWIRELESS_PCMCIA_MINORS);
568 if (!ipw_tty_driver)
569 return -ENOMEM;
570
571 ipw_tty_driver->driver_name = IPWIRELESS_PCCARD_NAME;
572 ipw_tty_driver->name = "ttyIPWp";
573 ipw_tty_driver->major = 0;
574 ipw_tty_driver->minor_start = IPWIRELESS_PCMCIA_START;
575 ipw_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
576 ipw_tty_driver->subtype = SERIAL_TYPE_NORMAL;
577 ipw_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
578 ipw_tty_driver->init_termios = tty_std_termios;
579 ipw_tty_driver->init_termios.c_cflag =
580 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
581 ipw_tty_driver->init_termios.c_ispeed = 9600;
582 ipw_tty_driver->init_termios.c_ospeed = 9600;
583 tty_set_operations(ipw_tty_driver, &tty_ops);
584 result = tty_register_driver(ipw_tty_driver);
585 if (result) {
586 printk(KERN_ERR IPWIRELESS_PCCARD_NAME
587 ": failed to register tty driver\n");
588 put_tty_driver(ipw_tty_driver);
589 return result;
590 }
591
592 return 0;
593}
594
595void ipwireless_tty_release(void)
596{
597 tty_unregister_driver(ipw_tty_driver);
598 put_tty_driver(ipw_tty_driver);
599}
600
601int ipwireless_tty_is_modem(struct ipw_tty *tty)
602{
603 return tty->tty_type == TTYTYPE_MODEM;
604}
605
606void
607ipwireless_tty_notify_control_line_change(struct ipw_tty *tty,
608 unsigned int channel_idx,
609 unsigned int control_lines,
610 unsigned int changed_mask)
611{
612 unsigned int old_control_lines = tty->control_lines;
613
614 tty->control_lines = (tty->control_lines & ~changed_mask)
615 | (control_lines & changed_mask);
616
617 /*
618 * If DCD is de-asserted, we close the tty so pppd can tell that we
619 * have gone offline.
620 */
621 if ((old_control_lines & IPW_CONTROL_LINE_DCD)
622 && !(tty->control_lines & IPW_CONTROL_LINE_DCD)
623 && tty->port.tty) {
624 tty_hangup(tty->port.tty);
625 }
626}
627