1 /*
2 RFCOMM implementation for Linux Bluetooth stack (BlueZ).
3 Copyright (C) 2002 Maxim Krasnyansky <maxk@qualcomm.com>
4 Copyright (C) 2002 Marcel Holtmann <marcel@holtmann.org>
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License version 2 as
8 published by the Free Software Foundation;
9
10 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
11 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
12 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
13 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
14 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
15 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18
19 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
20 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
21 SOFTWARE IS DISCLAIMED.
22 */
23
24 /*
25 * RFCOMM TTY.
26 *
27 * $Id: tty.c,v 1.24 2002/10/03 01:54:38 holtmann Exp $
28 */
29
30 #include <linux/config.h>
31 #include <linux/module.h>
32
33 #include <linux/tty.h>
34 #include <linux/tty_driver.h>
35 #include <linux/tty_flip.h>
36
37 #include <linux/slab.h>
38 #include <linux/skbuff.h>
39
40 #include <net/bluetooth/bluetooth.h>
41 #include <net/bluetooth/rfcomm.h>
42
43 #ifndef CONFIG_BT_RFCOMM_DEBUG
44 #undef BT_DBG
45 #define BT_DBG(D...)
46 #endif
47
48 #define RFCOMM_TTY_MAGIC 0x6d02 /* magic number for rfcomm struct */
49 #define RFCOMM_TTY_PORTS RFCOMM_MAX_DEV /* whole lotta rfcomm devices */
50 #define RFCOMM_TTY_MAJOR 216 /* device node major id of the usb/bluetooth.c driver */
51 #define RFCOMM_TTY_MINOR 0
52
53 static struct tty_driver *rfcomm_tty_driver;
54
55 struct rfcomm_dev {
56 struct list_head list;
57 atomic_t refcnt;
58
59 char name[12];
60 int id;
61 unsigned long flags;
62 int opened;
63 int err;
64
65 bdaddr_t src;
66 bdaddr_t dst;
67 u8 channel;
68
69 uint modem_status;
70
71 struct rfcomm_dlc *dlc;
72 struct tty_struct *tty;
73 wait_queue_head_t wait;
74 struct tasklet_struct wakeup_task;
75
76 atomic_t wmem_alloc;
77 };
78
79 static LIST_HEAD(rfcomm_dev_list);
80 static DEFINE_RWLOCK(rfcomm_dev_lock);
81
82 static void rfcomm_dev_data_ready(struct rfcomm_dlc *dlc, struct sk_buff *skb);
83 static void rfcomm_dev_state_change(struct rfcomm_dlc *dlc, int err);
84 static void rfcomm_dev_modem_status(struct rfcomm_dlc *dlc, u8 v24_sig);
85
86 static void rfcomm_tty_wakeup(unsigned long arg);
87
88 /* ---- Device functions ---- */
89 static void rfcomm_dev_destruct(struct rfcomm_dev *dev)
90 {
91 struct rfcomm_dlc *dlc = dev->dlc;
92
93 BT_DBG("dev %p dlc %p", dev, dlc);
94
95 rfcomm_dlc_lock(dlc);
96 /* Detach DLC if it's owned by this dev */
97 if (dlc->owner == dev)
98 dlc->owner = NULL;
99 rfcomm_dlc_unlock(dlc);
100
101 rfcomm_dlc_put(dlc);
102
103 tty_unregister_device(rfcomm_tty_driver, dev->id);
104
105 /* Refcount should only hit zero when called from rfcomm_dev_del()
106 which will have taken us off the list. Everything else are
107 refcounting bugs. */
108 BUG_ON(!list_empty(&dev->list));
109
110 kfree(dev);
111
112 /* It's safe to call module_put() here because socket still
113 holds reference to this module. */
114 module_put(THIS_MODULE);
115 }
116
117 static inline void rfcomm_dev_hold(struct rfcomm_dev *dev)
118 {
119 atomic_inc(&dev->refcnt);
120 }
121
122 static inline void rfcomm_dev_put(struct rfcomm_dev *dev)
123 {
124 /* The reason this isn't actually a race, as you no
125 doubt have a little voice screaming at you in your
126 head, is that the refcount should never actually
127 reach zero unless the device has already been taken
128 off the list, in rfcomm_dev_del(). And if that's not
129 true, we'll hit the BUG() in rfcomm_dev_destruct()
130 anyway. */
131 if (atomic_dec_and_test(&dev->refcnt))
132 rfcomm_dev_destruct(dev);
133 }
134
135 static struct rfcomm_dev *__rfcomm_dev_get(int id)
136 {
137 struct rfcomm_dev *dev;
138 struct list_head *p;
139
140 list_for_each(p, &rfcomm_dev_list) {
141 dev = list_entry(p, struct rfcomm_dev, list);
142 if (dev->id == id)
143 return dev;
144 }
145
146 return NULL;
147 }
148
149 static inline struct rfcomm_dev *rfcomm_dev_get(int id)
150 {
151 struct rfcomm_dev *dev;
152
153 read_lock(&rfcomm_dev_lock);
154
155 dev = __rfcomm_dev_get(id);
156 if (dev)
157 rfcomm_dev_hold(dev);
158
159 read_unlock(&rfcomm_dev_lock);
160
161 return dev;
162 }
163
164 static int rfcomm_dev_add(struct rfcomm_dev_req *req, struct rfcomm_dlc *dlc)
165 {
166 struct rfcomm_dev *dev;
167 struct list_head *head = &rfcomm_dev_list, *p;
168 int err = 0;
169
170 BT_DBG("id %d channel %d", req->dev_id, req->channel);
171
172 dev = kmalloc(sizeof(struct rfcomm_dev), GFP_KERNEL);
173 if (!dev)
174 return -ENOMEM;
175 memset(dev, 0, sizeof(struct rfcomm_dev));
176
177 write_lock_bh(&rfcomm_dev_lock);
178
179 if (req->dev_id < 0) {
180 dev->id = 0;
181
182 list_for_each(p, &rfcomm_dev_list) {
183 if (list_entry(p, struct rfcomm_dev, list)->id != dev->id)
184 break;
185
186 dev->id++;
187 head = p;
188 }
189 } else {
190 dev->id = req->dev_id;
191
192 list_for_each(p, &rfcomm_dev_list) {
193 struct rfcomm_dev *entry = list_entry(p, struct rfcomm_dev, list);
194
195 if (entry->id == dev->id) {
196 err = -EADDRINUSE;
197 goto out;
198 }
199
200 if (entry->id > dev->id - 1)
201 break;
202
203 head = p;
204 }
205 }
206
207 if ((dev->id < 0) || (dev->id > RFCOMM_MAX_DEV - 1)) {
208 err = -ENFILE;
209 goto out;
210 }
211
212 sprintf(dev->name, "rfcomm%d", dev->id);
213
214 list_add(&dev->list, head);
215 atomic_set(&dev->refcnt, 1);
216
217 bacpy(&dev->src, &req->src);
218 bacpy(&dev->dst, &req->dst);
219 dev->channel = req->channel;
220
221 dev->flags = req->flags &
222 ((1 << RFCOMM_RELEASE_ONHUP) | (1 << RFCOMM_REUSE_DLC));
223
224 init_waitqueue_head(&dev->wait);
225 tasklet_init(&dev->wakeup_task, rfcomm_tty_wakeup, (unsigned long) dev);
226
227 rfcomm_dlc_lock(dlc);
228 dlc->data_ready = rfcomm_dev_data_ready;
229 dlc->state_change = rfcomm_dev_state_change;
230 dlc->modem_status = rfcomm_dev_modem_status;
231
232 dlc->owner = dev;
233 dev->dlc = dlc;
234 rfcomm_dlc_unlock(dlc);
235
236 /* It's safe to call __module_get() here because socket already
237 holds reference to this module. */
238 __module_get(THIS_MODULE);
239
240 out:
241 write_unlock_bh(&rfcomm_dev_lock);
242
243 if (err) {
244 kfree(dev);
245 return err;
246 }
247
248 tty_register_device(rfcomm_tty_driver, dev->id, NULL);
249
250 return dev->id;
251 }
252
253 static void rfcomm_dev_del(struct rfcomm_dev *dev)
254 {
255 BT_DBG("dev %p", dev);
256
257 write_lock_bh(&rfcomm_dev_lock);
258 list_del_init(&dev->list);
259 write_unlock_bh(&rfcomm_dev_lock);
260
261 rfcomm_dev_put(dev);
262 }
263
264 /* ---- Send buffer ---- */
265 static inline unsigned int rfcomm_room(struct rfcomm_dlc *dlc)
266 {
267 /* We can't let it be zero, because we don't get a callback
268 when tx_credits becomes nonzero, hence we'd never wake up */
269 return dlc->mtu * (dlc->tx_credits?:1);
270 }
271
272 static void rfcomm_wfree(struct sk_buff *skb)
273 {
274 struct rfcomm_dev *dev = (void *) skb->sk;
275 atomic_sub(skb->truesize, &dev->wmem_alloc);
276 if (test_bit(RFCOMM_TTY_ATTACHED, &dev->flags))
277 tasklet_schedule(&dev->wakeup_task);
278 rfcomm_dev_put(dev);
279 }
280
281 static inline void rfcomm_set_owner_w(struct sk_buff *skb, struct rfcomm_dev *dev)
282 {
283 rfcomm_dev_hold(dev);
284 atomic_add(skb->truesize, &dev->wmem_alloc);
285 skb->sk = (void *) dev;
286 skb->destructor = rfcomm_wfree;
287 }
288
289 static struct sk_buff *rfcomm_wmalloc(struct rfcomm_dev *dev, unsigned long size, int priority)
290 {
291 if (atomic_read(&dev->wmem_alloc) < rfcomm_room(dev->dlc)) {
292 struct sk_buff *skb = alloc_skb(size, priority);
293 if (skb) {
294 rfcomm_set_owner_w(skb, dev);
295 return skb;
296 }
297 }
298 return NULL;
299 }
300
301 /* ---- Device IOCTLs ---- */
302
303 #define NOCAP_FLAGS ((1 << RFCOMM_REUSE_DLC) | (1 << RFCOMM_RELEASE_ONHUP))
304
305 static int rfcomm_create_dev(struct sock *sk, void __user *arg)
306 {
307 struct rfcomm_dev_req req;
308 struct rfcomm_dlc *dlc;
309 int id;
310
311 if (copy_from_user(&req, arg, sizeof(req)))
312 return -EFAULT;
313
314 BT_DBG("sk %p dev_id %id flags 0x%x", sk, req.dev_id, req.flags);
315
316 if (req.flags != NOCAP_FLAGS && !capable(CAP_NET_ADMIN))
317 return -EPERM;
318
319 if (req.flags & (1 << RFCOMM_REUSE_DLC)) {
320 /* Socket must be connected */
321 if (sk->sk_state != BT_CONNECTED)
322 return -EBADFD;
323
324 dlc = rfcomm_pi(sk)->dlc;
325 rfcomm_dlc_hold(dlc);
326 } else {
327 dlc = rfcomm_dlc_alloc(GFP_KERNEL);
328 if (!dlc)
329 return -ENOMEM;
330 }
331
332 id = rfcomm_dev_add(&req, dlc);
333 if (id < 0) {
334 rfcomm_dlc_put(dlc);
335 return id;
336 }
337
338 if (req.flags & (1 << RFCOMM_REUSE_DLC)) {
339 /* DLC is now used by device.
340 * Socket must be disconnected */
341 sk->sk_state = BT_CLOSED;
342 }
343
344 return id;
345 }
346
347 static int rfcomm_release_dev(void __user *arg)
348 {
349 struct rfcomm_dev_req req;
350 struct rfcomm_dev *dev;
351
352 if (copy_from_user(&req, arg, sizeof(req)))
353 return -EFAULT;
354
355 BT_DBG("dev_id %id flags 0x%x", req.dev_id, req.flags);
356
357 if (!(dev = rfcomm_dev_get(req.dev_id)))
358 return -ENODEV;
359
360 if (dev->flags != NOCAP_FLAGS && !capable(CAP_NET_ADMIN)) {
361 rfcomm_dev_put(dev);
362 return -EPERM;
363 }
364
365 if (req.flags & (1 << RFCOMM_HANGUP_NOW))
366 rfcomm_dlc_close(dev->dlc, 0);
367
368 rfcomm_dev_del(dev);
369 rfcomm_dev_put(dev);
370 return 0;
371 }
372
373 static int rfcomm_get_dev_list(void __user *arg)
374 {
375 struct rfcomm_dev_list_req *dl;
376 struct rfcomm_dev_info *di;
377 struct list_head *p;
378 int n = 0, size, err;
379 u16 dev_num;
380
381 BT_DBG("");
382
383 if (get_user(dev_num, (u16 __user *) arg))
384 return -EFAULT;
385
386 if (!dev_num || dev_num > (PAGE_SIZE * 4) / sizeof(*di))
387 return -EINVAL;
388
389 size = sizeof(*dl) + dev_num * sizeof(*di);
390
391 if (!(dl = kmalloc(size, GFP_KERNEL)))
392 return -ENOMEM;
393
394 di = dl->dev_info;
395
396 read_lock_bh(&rfcomm_dev_lock);
397
398 list_for_each(p, &rfcomm_dev_list) {
399 struct rfcomm_dev *dev = list_entry(p, struct rfcomm_dev, list);
400 (di + n)->id = dev->id;
401 (di + n)->flags = dev->flags;
402 (di + n)->state = dev->dlc->state;
403 (di + n)->channel = dev->channel;
404 bacpy(&(di + n)->src, &dev->src);
405 bacpy(&(di + n)->dst, &dev->dst);
406 if (++n >= dev_num)
407 break;
408 }
409
410 read_unlock_bh(&rfcomm_dev_lock);
411
412 dl->dev_num = n;
413 size = sizeof(*dl) + n * sizeof(*di);
414
415 err = copy_to_user(arg, dl, size);
416 kfree(dl);
417
418 return err ? -EFAULT : 0;
419 }
420
421 static int rfcomm_get_dev_info(void __user *arg)
422 {
423 struct rfcomm_dev *dev;
424 struct rfcomm_dev_info di;
425 int err = 0;
426
427 BT_DBG("");
428
429 if (copy_from_user(&di, arg, sizeof(di)))
430 return -EFAULT;
431
432 if (!(dev = rfcomm_dev_get(di.id)))
433 return -ENODEV;
434
435 di.flags = dev->flags;
436 di.channel = dev->channel;
437 di.state = dev->dlc->state;
438 bacpy(&di.src, &dev->src);
439 bacpy(&di.dst, &dev->dst);
440
441 if (copy_to_user(arg, &di, sizeof(di)))
442 err = -EFAULT;
443
444 rfcomm_dev_put(dev);
445 return err;
446 }
447
448 int rfcomm_dev_ioctl(struct sock *sk, unsigned int cmd, void __user *arg)
449 {
450 BT_DBG("cmd %d arg %p", cmd, arg);
451
452 switch (cmd) {
453 case RFCOMMCREATEDEV:
454 return rfcomm_create_dev(sk, arg);
455
456 case RFCOMMRELEASEDEV:
457 return rfcomm_release_dev(arg);
458
459 case RFCOMMGETDEVLIST:
460 return rfcomm_get_dev_list(arg);
461
462 case RFCOMMGETDEVINFO:
463 return rfcomm_get_dev_info(arg);
464 }
465
466 return -EINVAL;
467 }
468
469 /* ---- DLC callbacks ---- */
470 static void rfcomm_dev_data_ready(struct rfcomm_dlc *dlc, struct sk_buff *skb)
471 {
472 struct rfcomm_dev *dev = dlc->owner;
473 struct tty_struct *tty;
474
475 if (!dev || !(tty = dev->tty)) {
476 kfree_skb(skb);
477 return;
478 }
479
480 BT_DBG("dlc %p tty %p len %d", dlc, tty, skb->len);
481
482 if (test_bit(TTY_DONT_FLIP, &tty->flags)) {
483 register int i;
484 for (i = 0; i < skb->len; i++) {
485 if (tty->flip.count >= TTY_FLIPBUF_SIZE)
486 tty_flip_buffer_push(tty);
487
488 tty_insert_flip_char(tty, skb->data[i], 0);
489 }
490 tty_flip_buffer_push(tty);
491 } else
492 tty->ldisc.receive_buf(tty, skb->data, NULL, skb->len);
493
494 kfree_skb(skb);
495 }
496
497 static void rfcomm_dev_state_change(struct rfcomm_dlc *dlc, int err)
498 {
499 struct rfcomm_dev *dev = dlc->owner;
500 if (!dev)
501 return;
502
503 BT_DBG("dlc %p dev %p err %d", dlc, dev, err);
504
505 dev->err = err;
506 wake_up_interruptible(&dev->wait);
507
508 if (dlc->state == BT_CLOSED) {
509 if (!dev->tty) {
510 if (test_bit(RFCOMM_RELEASE_ONHUP, &dev->flags)) {
511 rfcomm_dev_hold(dev);
512 rfcomm_dev_del(dev);
513
514 /* We have to drop DLC lock here, otherwise
515 rfcomm_dev_put() will dead lock if it's
516 the last reference. */
517 rfcomm_dlc_unlock(dlc);
518 rfcomm_dev_put(dev);
519 rfcomm_dlc_lock(dlc);
520 }
521 } else
522 tty_hangup(dev->tty);
523 }
524 }
525
526 static void rfcomm_dev_modem_status(struct rfcomm_dlc *dlc, u8 v24_sig)
527 {
528 struct rfcomm_dev *dev = dlc->owner;
529 if (!dev)
530 return;
531
532 BT_DBG("dlc %p dev %p v24_sig 0x%02x", dlc, dev, v24_sig);
533
534 dev->modem_status =
535 ((v24_sig & RFCOMM_V24_RTC) ? (TIOCM_DSR | TIOCM_DTR) : 0) |
536 ((v24_sig & RFCOMM_V24_RTR) ? (TIOCM_RTS | TIOCM_CTS) : 0) |
537 ((v24_sig & RFCOMM_V24_IC) ? TIOCM_RI : 0) |
538 ((v24_sig & RFCOMM_V24_DV) ? TIOCM_CD : 0);
539 }
540
541 /* ---- TTY functions ---- */
542 static void rfcomm_tty_wakeup(unsigned long arg)
543 {
544 struct rfcomm_dev *dev = (void *) arg;
545 struct tty_struct *tty = dev->tty;
546 if (!tty)
547 return;
548
549 BT_DBG("dev %p tty %p", dev, tty);
550
551 if (test_bit(TTY_DO_WRITE_WAKEUP, &tty->flags) && tty->ldisc.write_wakeup)
552 (tty->ldisc.write_wakeup)(tty);
553
554 wake_up_interruptible(&tty->write_wait);
555 #ifdef SERIAL_HAVE_POLL_WAIT
556 wake_up_interruptible(&tty->poll_wait);
557 #endif
558 }
559
560 static int rfcomm_tty_open(struct tty_struct *tty, struct file *filp)
561 {
562 DECLARE_WAITQUEUE(wait, current);
563 struct rfcomm_dev *dev;
564 struct rfcomm_dlc *dlc;
565 int err, id;
566
567 id = tty->index;
568
569 BT_DBG("tty %p id %d", tty, id);
570
571 /* We don't leak this refcount. For reasons which are not entirely
572 clear, the TTY layer will call our ->close() method even if the
573 open fails. We decrease the refcount there, and decreasing it
574 here too would cause breakage. */
575 dev = rfcomm_dev_get(id);
576 if (!dev)
577 return -ENODEV;
578
579 BT_DBG("dev %p dst %s channel %d opened %d", dev, batostr(&dev->dst), dev->channel, dev->opened);
580
581 if (dev->opened++ != 0)
582 return 0;
583
584 dlc = dev->dlc;
585
586 /* Attach TTY and open DLC */
587
588 rfcomm_dlc_lock(dlc);
589 tty->driver_data = dev;
590 dev->tty = tty;
591 rfcomm_dlc_unlock(dlc);
592 set_bit(RFCOMM_TTY_ATTACHED, &dev->flags);
593
594 err = rfcomm_dlc_open(dlc, &dev->src, &dev->dst, dev->channel);
595 if (err < 0)
596 return err;
597
598 /* Wait for DLC to connect */
599 add_wait_queue(&dev->wait, &wait);
600 while (1) {
601 set_current_state(TASK_INTERRUPTIBLE);
602
603 if (dlc->state == BT_CLOSED) {
604 err = -dev->err;
605 break;
606 }
607
608 if (dlc->state == BT_CONNECTED)
609 break;
610
611 if (signal_pending(current)) {
612 err = -EINTR;
613 break;
614 }
615
616 schedule();
617 }
618 set_current_state(TASK_RUNNING);
619 remove_wait_queue(&dev->wait, &wait);
620
621 return err;
622 }
623
624 static void rfcomm_tty_close(struct tty_struct *tty, struct file *filp)
625 {
626 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
627 if (!dev)
628 return;
629
630 BT_DBG("tty %p dev %p dlc %p opened %d", tty, dev, dev->dlc, dev->opened);
631
632 if (--dev->opened == 0) {
633 /* Close DLC and dettach TTY */
634 rfcomm_dlc_close(dev->dlc, 0);
635
636 clear_bit(RFCOMM_TTY_ATTACHED, &dev->flags);
637 tasklet_kill(&dev->wakeup_task);
638
639 rfcomm_dlc_lock(dev->dlc);
640 tty->driver_data = NULL;
641 dev->tty = NULL;
642 rfcomm_dlc_unlock(dev->dlc);
643 }
644
645 rfcomm_dev_put(dev);
646 }
647
648 static int rfcomm_tty_write(struct tty_struct *tty, const unsigned char *buf, int count)
649 {
650 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
651 struct rfcomm_dlc *dlc = dev->dlc;
652 struct sk_buff *skb;
653 int err = 0, sent = 0, size;
654
655 BT_DBG("tty %p count %d", tty, count);
656
657 while (count) {
658 size = min_t(uint, count, dlc->mtu);
659
660 skb = rfcomm_wmalloc(dev, size + RFCOMM_SKB_RESERVE, GFP_ATOMIC);
661
662 if (!skb)
663 break;
664
665 skb_reserve(skb, RFCOMM_SKB_HEAD_RESERVE);
666
667 memcpy(skb_put(skb, size), buf + sent, size);
668
669 if ((err = rfcomm_dlc_send(dlc, skb)) < 0) {
670 kfree_skb(skb);
671 break;
672 }
673
674 sent += size;
675 count -= size;
676 }
677
678 return sent ? sent : err;
679 }
680
681 static int rfcomm_tty_write_room(struct tty_struct *tty)
682 {
683 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
684 int room;
685
686 BT_DBG("tty %p", tty);
687
688 room = rfcomm_room(dev->dlc) - atomic_read(&dev->wmem_alloc);
689 if (room < 0)
690 room = 0;
691 return room;
692 }
693
694 static int rfcomm_tty_ioctl(struct tty_struct *tty, struct file *filp, unsigned int cmd, unsigned long arg)
695 {
696 BT_DBG("tty %p cmd 0x%02x", tty, cmd);
697
698 switch (cmd) {
699 case TCGETS:
700 BT_DBG("TCGETS is not supported");
701 return -ENOIOCTLCMD;
702
703 case TCSETS:
704 BT_DBG("TCSETS is not supported");
705 return -ENOIOCTLCMD;
706
707 case TIOCMIWAIT:
708 BT_DBG("TIOCMIWAIT");
709 break;
710
711 case TIOCGICOUNT:
712 BT_DBG("TIOCGICOUNT");
713 break;
714
715 case TIOCGSERIAL:
716 BT_ERR("TIOCGSERIAL is not supported");
717 return -ENOIOCTLCMD;
718
719 case TIOCSSERIAL:
720 BT_ERR("TIOCSSERIAL is not supported");
721 return -ENOIOCTLCMD;
722
723 case TIOCSERGSTRUCT:
724 BT_ERR("TIOCSERGSTRUCT is not supported");
725 return -ENOIOCTLCMD;
726
727 case TIOCSERGETLSR:
728 BT_ERR("TIOCSERGETLSR is not supported");
729 return -ENOIOCTLCMD;
730
731 case TIOCSERCONFIG:
732 BT_ERR("TIOCSERCONFIG is not supported");
733 return -ENOIOCTLCMD;
734
735 default:
736 return -ENOIOCTLCMD; /* ioctls which we must ignore */
737
738 }
739
740 return -ENOIOCTLCMD;
741 }
742
743 #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
744
745 static void rfcomm_tty_set_termios(struct tty_struct *tty, struct termios *old)
746 {
747 BT_DBG("tty %p", tty);
748
749 if ((tty->termios->c_cflag == old->c_cflag) &&
750 (RELEVANT_IFLAG(tty->termios->c_iflag) == RELEVANT_IFLAG(old->c_iflag)))
751 return;
752
753 /* handle turning off CRTSCTS */
754 if ((old->c_cflag & CRTSCTS) && !(tty->termios->c_cflag & CRTSCTS)) {
755 BT_DBG("turning off CRTSCTS");
756 }
757 }
758
759 static void rfcomm_tty_throttle(struct tty_struct *tty)
760 {
761 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
762
763 BT_DBG("tty %p dev %p", tty, dev);
764
765 rfcomm_dlc_throttle(dev->dlc);
766 }
767
768 static void rfcomm_tty_unthrottle(struct tty_struct *tty)
769 {
770 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
771
772 BT_DBG("tty %p dev %p", tty, dev);
773
774 rfcomm_dlc_unthrottle(dev->dlc);
775 }
776
777 static int rfcomm_tty_chars_in_buffer(struct tty_struct *tty)
778 {
779 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
780 struct rfcomm_dlc *dlc = dev->dlc;
781
782 BT_DBG("tty %p dev %p", tty, dev);
783
784 if (skb_queue_len(&dlc->tx_queue))
785 return dlc->mtu;
786
787 return 0;
788 }
789
790 static void rfcomm_tty_flush_buffer(struct tty_struct *tty)
791 {
792 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
793 if (!dev)
794 return;
795
796 BT_DBG("tty %p dev %p", tty, dev);
797
798 skb_queue_purge(&dev->dlc->tx_queue);
799
800 if (test_bit(TTY_DO_WRITE_WAKEUP, &tty->flags) && tty->ldisc.write_wakeup)
801 tty->ldisc.write_wakeup(tty);
802 }
803
804 static void rfcomm_tty_send_xchar(struct tty_struct *tty, char ch)
805 {
806 BT_DBG("tty %p ch %c", tty, ch);
807 }
808
809 static void rfcomm_tty_wait_until_sent(struct tty_struct *tty, int timeout)
810 {
811 BT_DBG("tty %p timeout %d", tty, timeout);
812 }
813
814 static void rfcomm_tty_hangup(struct tty_struct *tty)
815 {
816 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
817 if (!dev)
818 return;
819
820 BT_DBG("tty %p dev %p", tty, dev);
821
822 rfcomm_tty_flush_buffer(tty);
823
824 if (test_bit(RFCOMM_RELEASE_ONHUP, &dev->flags))
825 rfcomm_dev_del(dev);
826 }
827
828 static int rfcomm_tty_read_proc(char *buf, char **start, off_t offset, int len, int *eof, void *unused)
829 {
830 return 0;
831 }
832
833 static int rfcomm_tty_tiocmget(struct tty_struct *tty, struct file *filp)
834 {
835 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
836
837 BT_DBG("tty %p dev %p", tty, dev);
838
839 return dev->modem_status;
840 }
841
842 static int rfcomm_tty_tiocmset(struct tty_struct *tty, struct file *filp, unsigned int set, unsigned int clear)
843 {
844 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
845 struct rfcomm_dlc *dlc = dev->dlc;
846 u8 v24_sig;
847
848 BT_DBG("tty %p dev %p set 0x%02x clear 0x%02x", tty, dev, set, clear);
849
850 rfcomm_dlc_get_modem_status(dlc, &v24_sig);
851
852 if (set & TIOCM_DSR || set & TIOCM_DTR)
853 v24_sig |= RFCOMM_V24_RTC;
854 if (set & TIOCM_RTS || set & TIOCM_CTS)
855 v24_sig |= RFCOMM_V24_RTR;
856 if (set & TIOCM_RI)
857 v24_sig |= RFCOMM_V24_IC;
858 if (set & TIOCM_CD)
859 v24_sig |= RFCOMM_V24_DV;
860
861 if (clear & TIOCM_DSR || clear & TIOCM_DTR)
862 v24_sig &= ~RFCOMM_V24_RTC;
863 if (clear & TIOCM_RTS || clear & TIOCM_CTS)
864 v24_sig &= ~RFCOMM_V24_RTR;
865 if (clear & TIOCM_RI)
866 v24_sig &= ~RFCOMM_V24_IC;
867 if (clear & TIOCM_CD)
868 v24_sig &= ~RFCOMM_V24_DV;
869
870 rfcomm_dlc_set_modem_status(dlc, v24_sig);
871
872 return 0;
873 }
874
875 /* ---- TTY structure ---- */
876
877 static struct tty_operations rfcomm_ops = {
878 .open = rfcomm_tty_open,
879 .close = rfcomm_tty_close,
880 .write = rfcomm_tty_write,
881 .write_room = rfcomm_tty_write_room,
882 .chars_in_buffer = rfcomm_tty_chars_in_buffer,
883 .flush_buffer = rfcomm_tty_flush_buffer,
884 .ioctl = rfcomm_tty_ioctl,
885 .throttle = rfcomm_tty_throttle,
886 .unthrottle = rfcomm_tty_unthrottle,
887 .set_termios = rfcomm_tty_set_termios,
888 .send_xchar = rfcomm_tty_send_xchar,
889 .hangup = rfcomm_tty_hangup,
890 .wait_until_sent = rfcomm_tty_wait_until_sent,
891 .read_proc = rfcomm_tty_read_proc,
892 .tiocmget = rfcomm_tty_tiocmget,
893 .tiocmset = rfcomm_tty_tiocmset,
894 };
895
896 int rfcomm_init_ttys(void)
897 {
898 rfcomm_tty_driver = alloc_tty_driver(RFCOMM_TTY_PORTS);
899 if (!rfcomm_tty_driver)
900 return -1;
901
902 rfcomm_tty_driver->owner = THIS_MODULE;
903 rfcomm_tty_driver->driver_name = "rfcomm";
904 rfcomm_tty_driver->devfs_name = "bluetooth/rfcomm/";
905 rfcomm_tty_driver->name = "rfcomm";
906 rfcomm_tty_driver->major = RFCOMM_TTY_MAJOR;
907 rfcomm_tty_driver->minor_start = RFCOMM_TTY_MINOR;
908 rfcomm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
909 rfcomm_tty_driver->subtype = SERIAL_TYPE_NORMAL;
910 rfcomm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_NO_DEVFS;
911 rfcomm_tty_driver->init_termios = tty_std_termios;
912 rfcomm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
913 tty_set_operations(rfcomm_tty_driver, &rfcomm_ops);
914
915 if (tty_register_driver(rfcomm_tty_driver)) {
916 BT_ERR("Can't register RFCOMM TTY driver");
917 put_tty_driver(rfcomm_tty_driver);
918 return -1;
919 }
920
921 BT_INFO("RFCOMM TTY layer initialized");
922
923 return 0;
924 }
925
926 void rfcomm_cleanup_ttys(void)
927 {
928 tty_unregister_driver(rfcomm_tty_driver);
929 put_tty_driver(rfcomm_tty_driver);
930 }
931
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