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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 ssize_t ipw_write(struct tty_struct *linux_tty, const u8 *buf,
190 size_t 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 = tty_alloc_driver(IPWIRELESS_PCMCIA_MINORS,
568 TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV);
569 if (IS_ERR(ipw_tty_driver))
570 return PTR_ERR(ipw_tty_driver);
571
572 ipw_tty_driver->driver_name = IPWIRELESS_PCCARD_NAME;
573 ipw_tty_driver->name = "ttyIPWp";
574 ipw_tty_driver->major = 0;
575 ipw_tty_driver->minor_start = IPWIRELESS_PCMCIA_START;
576 ipw_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
577 ipw_tty_driver->subtype = SERIAL_TYPE_NORMAL;
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 tty_driver_kref_put(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 tty_driver_kref_put(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
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 ipw_tty *tty,
252 struct serial_struct __user *retinfo)
253{
254 struct serial_struct tmp;
255
256 memset(&tmp, 0, sizeof(tmp));
257 tmp.type = PORT_UNKNOWN;
258 tmp.line = tty->index;
259 tmp.baud_base = 115200;
260
261 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
262 return -EFAULT;
263
264 return 0;
265}
266
267static int ipw_chars_in_buffer(struct tty_struct *linux_tty)
268{
269 struct ipw_tty *tty = linux_tty->driver_data;
270
271 if (!tty)
272 return 0;
273
274 if (!tty->port.count)
275 return 0;
276
277 return tty->tx_bytes_queued;
278}
279
280static int get_control_lines(struct ipw_tty *tty)
281{
282 unsigned int my = tty->control_lines;
283 unsigned int out = 0;
284
285 if (my & IPW_CONTROL_LINE_RTS)
286 out |= TIOCM_RTS;
287 if (my & IPW_CONTROL_LINE_DTR)
288 out |= TIOCM_DTR;
289 if (my & IPW_CONTROL_LINE_CTS)
290 out |= TIOCM_CTS;
291 if (my & IPW_CONTROL_LINE_DSR)
292 out |= TIOCM_DSR;
293 if (my & IPW_CONTROL_LINE_DCD)
294 out |= TIOCM_CD;
295
296 return out;
297}
298
299static int set_control_lines(struct ipw_tty *tty, unsigned int set,
300 unsigned int clear)
301{
302 int ret;
303
304 if (set & TIOCM_RTS) {
305 ret = ipwireless_set_RTS(tty->hardware, tty->channel_idx, 1);
306 if (ret)
307 return ret;
308 if (tty->secondary_channel_idx != -1) {
309 ret = ipwireless_set_RTS(tty->hardware,
310 tty->secondary_channel_idx, 1);
311 if (ret)
312 return ret;
313 }
314 }
315 if (set & TIOCM_DTR) {
316 ret = ipwireless_set_DTR(tty->hardware, tty->channel_idx, 1);
317 if (ret)
318 return ret;
319 if (tty->secondary_channel_idx != -1) {
320 ret = ipwireless_set_DTR(tty->hardware,
321 tty->secondary_channel_idx, 1);
322 if (ret)
323 return ret;
324 }
325 }
326 if (clear & TIOCM_RTS) {
327 ret = ipwireless_set_RTS(tty->hardware, tty->channel_idx, 0);
328 if (tty->secondary_channel_idx != -1) {
329 ret = ipwireless_set_RTS(tty->hardware,
330 tty->secondary_channel_idx, 0);
331 if (ret)
332 return ret;
333 }
334 }
335 if (clear & TIOCM_DTR) {
336 ret = ipwireless_set_DTR(tty->hardware, tty->channel_idx, 0);
337 if (tty->secondary_channel_idx != -1) {
338 ret = ipwireless_set_DTR(tty->hardware,
339 tty->secondary_channel_idx, 0);
340 if (ret)
341 return ret;
342 }
343 }
344 return 0;
345}
346
347static int ipw_tiocmget(struct tty_struct *linux_tty)
348{
349 struct ipw_tty *tty = linux_tty->driver_data;
350 /* FIXME: Exactly how is the tty object locked here .. */
351
352 if (!tty)
353 return -ENODEV;
354
355 if (!tty->port.count)
356 return -EINVAL;
357
358 return get_control_lines(tty);
359}
360
361static int
362ipw_tiocmset(struct tty_struct *linux_tty,
363 unsigned int set, unsigned int clear)
364{
365 struct ipw_tty *tty = linux_tty->driver_data;
366 /* FIXME: Exactly how is the tty object locked here .. */
367
368 if (!tty)
369 return -ENODEV;
370
371 if (!tty->port.count)
372 return -EINVAL;
373
374 return set_control_lines(tty, set, clear);
375}
376
377static int ipw_ioctl(struct tty_struct *linux_tty,
378 unsigned int cmd, unsigned long arg)
379{
380 struct ipw_tty *tty = linux_tty->driver_data;
381
382 if (!tty)
383 return -ENODEV;
384
385 if (!tty->port.count)
386 return -EINVAL;
387
388 /* FIXME: Exactly how is the tty object locked here .. */
389
390 switch (cmd) {
391 case TIOCGSERIAL:
392 return ipwireless_get_serial_info(tty, (void __user *) arg);
393
394 case TIOCSSERIAL:
395 return 0; /* Keeps the PCMCIA scripts happy. */
396 }
397
398 if (tty->tty_type == TTYTYPE_MODEM) {
399 switch (cmd) {
400 case PPPIOCGCHAN:
401 {
402 int chan = ipwireless_ppp_channel_index(
403 tty->network);
404
405 if (chan < 0)
406 return -ENODEV;
407 if (put_user(chan, (int __user *) arg))
408 return -EFAULT;
409 }
410 return 0;
411
412 case PPPIOCGUNIT:
413 {
414 int unit = ipwireless_ppp_unit_number(
415 tty->network);
416
417 if (unit < 0)
418 return -ENODEV;
419 if (put_user(unit, (int __user *) arg))
420 return -EFAULT;
421 }
422 return 0;
423
424 case FIONREAD:
425 {
426 int val = 0;
427
428 if (put_user(val, (int __user *) arg))
429 return -EFAULT;
430 }
431 return 0;
432 case TCFLSH:
433 return tty_perform_flush(linux_tty, arg);
434 }
435 }
436 return -ENOIOCTLCMD;
437}
438
439static int add_tty(int j,
440 struct ipw_hardware *hardware,
441 struct ipw_network *network, int channel_idx,
442 int secondary_channel_idx, int tty_type)
443{
444 ttys[j] = kzalloc(sizeof(struct ipw_tty), GFP_KERNEL);
445 if (!ttys[j])
446 return -ENOMEM;
447 ttys[j]->index = j;
448 ttys[j]->hardware = hardware;
449 ttys[j]->channel_idx = channel_idx;
450 ttys[j]->secondary_channel_idx = secondary_channel_idx;
451 ttys[j]->network = network;
452 ttys[j]->tty_type = tty_type;
453 mutex_init(&ttys[j]->ipw_tty_mutex);
454 tty_port_init(&ttys[j]->port);
455
456 tty_port_register_device(&ttys[j]->port, ipw_tty_driver, j, NULL);
457 ipwireless_associate_network_tty(network, channel_idx, ttys[j]);
458
459 if (secondary_channel_idx != -1)
460 ipwireless_associate_network_tty(network,
461 secondary_channel_idx,
462 ttys[j]);
463 /* check if we provide raw device (if loopback is enabled) */
464 if (get_tty(j))
465 printk(KERN_INFO IPWIRELESS_PCCARD_NAME
466 ": registering %s device ttyIPWp%d\n",
467 tty_type_name(tty_type), j);
468
469 return 0;
470}
471
472struct ipw_tty *ipwireless_tty_create(struct ipw_hardware *hardware,
473 struct ipw_network *network)
474{
475 int i, j;
476
477 for (i = 0; i < IPWIRELESS_PCMCIA_MINOR_RANGE; i++) {
478 int allfree = 1;
479
480 for (j = i; j < IPWIRELESS_PCMCIA_MINORS;
481 j += IPWIRELESS_PCMCIA_MINOR_RANGE)
482 if (ttys[j] != NULL) {
483 allfree = 0;
484 break;
485 }
486
487 if (allfree) {
488 j = i;
489
490 if (add_tty(j, hardware, network,
491 IPW_CHANNEL_DIALLER, IPW_CHANNEL_RAS,
492 TTYTYPE_MODEM))
493 return NULL;
494
495 j += IPWIRELESS_PCMCIA_MINOR_RANGE;
496 if (add_tty(j, hardware, network,
497 IPW_CHANNEL_DIALLER, -1,
498 TTYTYPE_MONITOR))
499 return NULL;
500
501 j += IPWIRELESS_PCMCIA_MINOR_RANGE;
502 if (add_tty(j, hardware, network,
503 IPW_CHANNEL_RAS, -1,
504 TTYTYPE_RAS_RAW))
505 return NULL;
506
507 return ttys[i];
508 }
509 }
510 return NULL;
511}
512
513/*
514 * Must be called before ipwireless_network_free().
515 */
516void ipwireless_tty_free(struct ipw_tty *tty)
517{
518 int j;
519 struct ipw_network *network = ttys[tty->index]->network;
520
521 for (j = tty->index; j < IPWIRELESS_PCMCIA_MINORS;
522 j += IPWIRELESS_PCMCIA_MINOR_RANGE) {
523 struct ipw_tty *ttyj = ttys[j];
524
525 if (ttyj) {
526 mutex_lock(&ttyj->ipw_tty_mutex);
527 if (get_tty(j))
528 printk(KERN_INFO IPWIRELESS_PCCARD_NAME
529 ": deregistering %s device ttyIPWp%d\n",
530 tty_type_name(ttyj->tty_type), j);
531 ttyj->closing = 1;
532 if (ttyj->port.tty != NULL) {
533 mutex_unlock(&ttyj->ipw_tty_mutex);
534 tty_vhangup(ttyj->port.tty);
535 /* FIXME: Exactly how is the tty object locked here
536 against a parallel ioctl etc */
537 /* FIXME2: hangup does not mean all processes
538 * are gone */
539 mutex_lock(&ttyj->ipw_tty_mutex);
540 }
541 while (ttyj->port.count)
542 do_ipw_close(ttyj);
543 ipwireless_disassociate_network_ttys(network,
544 ttyj->channel_idx);
545 tty_unregister_device(ipw_tty_driver, j);
546 tty_port_destroy(&ttyj->port);
547 ttys[j] = NULL;
548 mutex_unlock(&ttyj->ipw_tty_mutex);
549 kfree(ttyj);
550 }
551 }
552}
553
554static const struct tty_operations tty_ops = {
555 .open = ipw_open,
556 .close = ipw_close,
557 .hangup = ipw_hangup,
558 .write = ipw_write,
559 .write_room = ipw_write_room,
560 .ioctl = ipw_ioctl,
561 .chars_in_buffer = ipw_chars_in_buffer,
562 .tiocmget = ipw_tiocmget,
563 .tiocmset = ipw_tiocmset,
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