Loading...
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
28#include <linux/module.h>
29
30#include <linux/tty.h>
31#include <linux/tty_driver.h>
32#include <linux/tty_flip.h>
33
34#include <linux/capability.h>
35#include <linux/slab.h>
36#include <linux/skbuff.h>
37#include <linux/workqueue.h>
38
39#include <net/bluetooth/bluetooth.h>
40#include <net/bluetooth/hci_core.h>
41#include <net/bluetooth/rfcomm.h>
42
43#define RFCOMM_TTY_MAGIC 0x6d02 /* magic number for rfcomm struct */
44#define RFCOMM_TTY_PORTS RFCOMM_MAX_DEV /* whole lotta rfcomm devices */
45#define RFCOMM_TTY_MAJOR 216 /* device node major id of the usb/bluetooth.c driver */
46#define RFCOMM_TTY_MINOR 0
47
48static struct tty_driver *rfcomm_tty_driver;
49
50struct rfcomm_dev {
51 struct tty_port port;
52 struct list_head list;
53
54 char name[12];
55 int id;
56 unsigned long flags;
57 int err;
58
59 bdaddr_t src;
60 bdaddr_t dst;
61 u8 channel;
62
63 uint modem_status;
64
65 struct rfcomm_dlc *dlc;
66 wait_queue_head_t wait;
67
68 struct device *tty_dev;
69
70 atomic_t wmem_alloc;
71
72 struct sk_buff_head pending;
73};
74
75static LIST_HEAD(rfcomm_dev_list);
76static DEFINE_SPINLOCK(rfcomm_dev_lock);
77
78static void rfcomm_dev_data_ready(struct rfcomm_dlc *dlc, struct sk_buff *skb);
79static void rfcomm_dev_state_change(struct rfcomm_dlc *dlc, int err);
80static void rfcomm_dev_modem_status(struct rfcomm_dlc *dlc, u8 v24_sig);
81
82/* ---- Device functions ---- */
83
84/*
85 * The reason this isn't actually a race, as you no doubt have a little voice
86 * screaming at you in your head, is that the refcount should never actually
87 * reach zero unless the device has already been taken off the list, in
88 * rfcomm_dev_del(). And if that's not true, we'll hit the BUG() in
89 * rfcomm_dev_destruct() anyway.
90 */
91static void rfcomm_dev_destruct(struct tty_port *port)
92{
93 struct rfcomm_dev *dev = container_of(port, struct rfcomm_dev, port);
94 struct rfcomm_dlc *dlc = dev->dlc;
95
96 BT_DBG("dev %p dlc %p", dev, dlc);
97
98 /* Refcount should only hit zero when called from rfcomm_dev_del()
99 which will have taken us off the list. Everything else are
100 refcounting bugs. */
101 BUG_ON(!list_empty(&dev->list));
102
103 rfcomm_dlc_lock(dlc);
104 /* Detach DLC if it's owned by this dev */
105 if (dlc->owner == dev)
106 dlc->owner = NULL;
107 rfcomm_dlc_unlock(dlc);
108
109 rfcomm_dlc_put(dlc);
110
111 tty_unregister_device(rfcomm_tty_driver, dev->id);
112
113 kfree(dev);
114
115 /* It's safe to call module_put() here because socket still
116 holds reference to this module. */
117 module_put(THIS_MODULE);
118}
119
120static const struct tty_port_operations rfcomm_port_ops = {
121 .destruct = rfcomm_dev_destruct,
122};
123
124static struct rfcomm_dev *__rfcomm_dev_get(int id)
125{
126 struct rfcomm_dev *dev;
127
128 list_for_each_entry(dev, &rfcomm_dev_list, list)
129 if (dev->id == id)
130 return dev;
131
132 return NULL;
133}
134
135static inline struct rfcomm_dev *rfcomm_dev_get(int id)
136{
137 struct rfcomm_dev *dev;
138
139 spin_lock(&rfcomm_dev_lock);
140
141 dev = __rfcomm_dev_get(id);
142
143 if (dev) {
144 if (test_bit(RFCOMM_TTY_RELEASED, &dev->flags))
145 dev = NULL;
146 else
147 tty_port_get(&dev->port);
148 }
149
150 spin_unlock(&rfcomm_dev_lock);
151
152 return dev;
153}
154
155static struct device *rfcomm_get_device(struct rfcomm_dev *dev)
156{
157 struct hci_dev *hdev;
158 struct hci_conn *conn;
159
160 hdev = hci_get_route(&dev->dst, &dev->src);
161 if (!hdev)
162 return NULL;
163
164 conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &dev->dst);
165
166 hci_dev_put(hdev);
167
168 return conn ? &conn->dev : NULL;
169}
170
171static ssize_t show_address(struct device *tty_dev, struct device_attribute *attr, char *buf)
172{
173 struct rfcomm_dev *dev = dev_get_drvdata(tty_dev);
174 return sprintf(buf, "%s\n", batostr(&dev->dst));
175}
176
177static ssize_t show_channel(struct device *tty_dev, struct device_attribute *attr, char *buf)
178{
179 struct rfcomm_dev *dev = dev_get_drvdata(tty_dev);
180 return sprintf(buf, "%d\n", dev->channel);
181}
182
183static DEVICE_ATTR(address, S_IRUGO, show_address, NULL);
184static DEVICE_ATTR(channel, S_IRUGO, show_channel, NULL);
185
186static int rfcomm_dev_add(struct rfcomm_dev_req *req, struct rfcomm_dlc *dlc)
187{
188 struct rfcomm_dev *dev, *entry;
189 struct list_head *head = &rfcomm_dev_list;
190 int err = 0;
191
192 BT_DBG("id %d channel %d", req->dev_id, req->channel);
193
194 dev = kzalloc(sizeof(struct rfcomm_dev), GFP_KERNEL);
195 if (!dev)
196 return -ENOMEM;
197
198 spin_lock(&rfcomm_dev_lock);
199
200 if (req->dev_id < 0) {
201 dev->id = 0;
202
203 list_for_each_entry(entry, &rfcomm_dev_list, list) {
204 if (entry->id != dev->id)
205 break;
206
207 dev->id++;
208 head = &entry->list;
209 }
210 } else {
211 dev->id = req->dev_id;
212
213 list_for_each_entry(entry, &rfcomm_dev_list, list) {
214 if (entry->id == dev->id) {
215 err = -EADDRINUSE;
216 goto out;
217 }
218
219 if (entry->id > dev->id - 1)
220 break;
221
222 head = &entry->list;
223 }
224 }
225
226 if ((dev->id < 0) || (dev->id > RFCOMM_MAX_DEV - 1)) {
227 err = -ENFILE;
228 goto out;
229 }
230
231 sprintf(dev->name, "rfcomm%d", dev->id);
232
233 list_add(&dev->list, head);
234
235 bacpy(&dev->src, &req->src);
236 bacpy(&dev->dst, &req->dst);
237 dev->channel = req->channel;
238
239 dev->flags = req->flags &
240 ((1 << RFCOMM_RELEASE_ONHUP) | (1 << RFCOMM_REUSE_DLC));
241
242 tty_port_init(&dev->port);
243 dev->port.ops = &rfcomm_port_ops;
244 init_waitqueue_head(&dev->wait);
245
246 skb_queue_head_init(&dev->pending);
247
248 rfcomm_dlc_lock(dlc);
249
250 if (req->flags & (1 << RFCOMM_REUSE_DLC)) {
251 struct sock *sk = dlc->owner;
252 struct sk_buff *skb;
253
254 BUG_ON(!sk);
255
256 rfcomm_dlc_throttle(dlc);
257
258 while ((skb = skb_dequeue(&sk->sk_receive_queue))) {
259 skb_orphan(skb);
260 skb_queue_tail(&dev->pending, skb);
261 atomic_sub(skb->len, &sk->sk_rmem_alloc);
262 }
263 }
264
265 dlc->data_ready = rfcomm_dev_data_ready;
266 dlc->state_change = rfcomm_dev_state_change;
267 dlc->modem_status = rfcomm_dev_modem_status;
268
269 dlc->owner = dev;
270 dev->dlc = dlc;
271
272 rfcomm_dev_modem_status(dlc, dlc->remote_v24_sig);
273
274 rfcomm_dlc_unlock(dlc);
275
276 /* It's safe to call __module_get() here because socket already
277 holds reference to this module. */
278 __module_get(THIS_MODULE);
279
280out:
281 spin_unlock(&rfcomm_dev_lock);
282
283 if (err < 0)
284 goto free;
285
286 dev->tty_dev = tty_register_device(rfcomm_tty_driver, dev->id, NULL);
287
288 if (IS_ERR(dev->tty_dev)) {
289 err = PTR_ERR(dev->tty_dev);
290 list_del(&dev->list);
291 goto free;
292 }
293
294 dev_set_drvdata(dev->tty_dev, dev);
295
296 if (device_create_file(dev->tty_dev, &dev_attr_address) < 0)
297 BT_ERR("Failed to create address attribute");
298
299 if (device_create_file(dev->tty_dev, &dev_attr_channel) < 0)
300 BT_ERR("Failed to create channel attribute");
301
302 return dev->id;
303
304free:
305 kfree(dev);
306 return err;
307}
308
309static void rfcomm_dev_del(struct rfcomm_dev *dev)
310{
311 unsigned long flags;
312 BT_DBG("dev %p", dev);
313
314 BUG_ON(test_and_set_bit(RFCOMM_TTY_RELEASED, &dev->flags));
315
316 spin_lock_irqsave(&dev->port.lock, flags);
317 if (dev->port.count > 0) {
318 spin_unlock_irqrestore(&dev->port.lock, flags);
319 return;
320 }
321 spin_unlock_irqrestore(&dev->port.lock, flags);
322
323 spin_lock(&rfcomm_dev_lock);
324 list_del_init(&dev->list);
325 spin_unlock(&rfcomm_dev_lock);
326
327 tty_port_put(&dev->port);
328}
329
330/* ---- Send buffer ---- */
331static inline unsigned int rfcomm_room(struct rfcomm_dlc *dlc)
332{
333 /* We can't let it be zero, because we don't get a callback
334 when tx_credits becomes nonzero, hence we'd never wake up */
335 return dlc->mtu * (dlc->tx_credits?:1);
336}
337
338static void rfcomm_wfree(struct sk_buff *skb)
339{
340 struct rfcomm_dev *dev = (void *) skb->sk;
341 struct tty_struct *tty = dev->port.tty;
342 atomic_sub(skb->truesize, &dev->wmem_alloc);
343 if (test_bit(RFCOMM_TTY_ATTACHED, &dev->flags) && tty)
344 tty_wakeup(tty);
345 tty_port_put(&dev->port);
346}
347
348static inline void rfcomm_set_owner_w(struct sk_buff *skb, struct rfcomm_dev *dev)
349{
350 tty_port_get(&dev->port);
351 atomic_add(skb->truesize, &dev->wmem_alloc);
352 skb->sk = (void *) dev;
353 skb->destructor = rfcomm_wfree;
354}
355
356static struct sk_buff *rfcomm_wmalloc(struct rfcomm_dev *dev, unsigned long size, gfp_t priority)
357{
358 if (atomic_read(&dev->wmem_alloc) < rfcomm_room(dev->dlc)) {
359 struct sk_buff *skb = alloc_skb(size, priority);
360 if (skb) {
361 rfcomm_set_owner_w(skb, dev);
362 return skb;
363 }
364 }
365 return NULL;
366}
367
368/* ---- Device IOCTLs ---- */
369
370#define NOCAP_FLAGS ((1 << RFCOMM_REUSE_DLC) | (1 << RFCOMM_RELEASE_ONHUP))
371
372static int rfcomm_create_dev(struct sock *sk, void __user *arg)
373{
374 struct rfcomm_dev_req req;
375 struct rfcomm_dlc *dlc;
376 int id;
377
378 if (copy_from_user(&req, arg, sizeof(req)))
379 return -EFAULT;
380
381 BT_DBG("sk %p dev_id %d flags 0x%x", sk, req.dev_id, req.flags);
382
383 if (req.flags != NOCAP_FLAGS && !capable(CAP_NET_ADMIN))
384 return -EPERM;
385
386 if (req.flags & (1 << RFCOMM_REUSE_DLC)) {
387 /* Socket must be connected */
388 if (sk->sk_state != BT_CONNECTED)
389 return -EBADFD;
390
391 dlc = rfcomm_pi(sk)->dlc;
392 rfcomm_dlc_hold(dlc);
393 } else {
394 dlc = rfcomm_dlc_alloc(GFP_KERNEL);
395 if (!dlc)
396 return -ENOMEM;
397 }
398
399 id = rfcomm_dev_add(&req, dlc);
400 if (id < 0) {
401 rfcomm_dlc_put(dlc);
402 return id;
403 }
404
405 if (req.flags & (1 << RFCOMM_REUSE_DLC)) {
406 /* DLC is now used by device.
407 * Socket must be disconnected */
408 sk->sk_state = BT_CLOSED;
409 }
410
411 return id;
412}
413
414static int rfcomm_release_dev(void __user *arg)
415{
416 struct rfcomm_dev_req req;
417 struct rfcomm_dev *dev;
418
419 if (copy_from_user(&req, arg, sizeof(req)))
420 return -EFAULT;
421
422 BT_DBG("dev_id %d flags 0x%x", req.dev_id, req.flags);
423
424 dev = rfcomm_dev_get(req.dev_id);
425 if (!dev)
426 return -ENODEV;
427
428 if (dev->flags != NOCAP_FLAGS && !capable(CAP_NET_ADMIN)) {
429 tty_port_put(&dev->port);
430 return -EPERM;
431 }
432
433 if (req.flags & (1 << RFCOMM_HANGUP_NOW))
434 rfcomm_dlc_close(dev->dlc, 0);
435
436 /* Shut down TTY synchronously before freeing rfcomm_dev */
437 if (dev->port.tty)
438 tty_vhangup(dev->port.tty);
439
440 if (!test_bit(RFCOMM_RELEASE_ONHUP, &dev->flags))
441 rfcomm_dev_del(dev);
442 tty_port_put(&dev->port);
443 return 0;
444}
445
446static int rfcomm_get_dev_list(void __user *arg)
447{
448 struct rfcomm_dev *dev;
449 struct rfcomm_dev_list_req *dl;
450 struct rfcomm_dev_info *di;
451 int n = 0, size, err;
452 u16 dev_num;
453
454 BT_DBG("");
455
456 if (get_user(dev_num, (u16 __user *) arg))
457 return -EFAULT;
458
459 if (!dev_num || dev_num > (PAGE_SIZE * 4) / sizeof(*di))
460 return -EINVAL;
461
462 size = sizeof(*dl) + dev_num * sizeof(*di);
463
464 dl = kzalloc(size, GFP_KERNEL);
465 if (!dl)
466 return -ENOMEM;
467
468 di = dl->dev_info;
469
470 spin_lock(&rfcomm_dev_lock);
471
472 list_for_each_entry(dev, &rfcomm_dev_list, list) {
473 if (test_bit(RFCOMM_TTY_RELEASED, &dev->flags))
474 continue;
475 (di + n)->id = dev->id;
476 (di + n)->flags = dev->flags;
477 (di + n)->state = dev->dlc->state;
478 (di + n)->channel = dev->channel;
479 bacpy(&(di + n)->src, &dev->src);
480 bacpy(&(di + n)->dst, &dev->dst);
481 if (++n >= dev_num)
482 break;
483 }
484
485 spin_unlock(&rfcomm_dev_lock);
486
487 dl->dev_num = n;
488 size = sizeof(*dl) + n * sizeof(*di);
489
490 err = copy_to_user(arg, dl, size);
491 kfree(dl);
492
493 return err ? -EFAULT : 0;
494}
495
496static int rfcomm_get_dev_info(void __user *arg)
497{
498 struct rfcomm_dev *dev;
499 struct rfcomm_dev_info di;
500 int err = 0;
501
502 BT_DBG("");
503
504 if (copy_from_user(&di, arg, sizeof(di)))
505 return -EFAULT;
506
507 dev = rfcomm_dev_get(di.id);
508 if (!dev)
509 return -ENODEV;
510
511 di.flags = dev->flags;
512 di.channel = dev->channel;
513 di.state = dev->dlc->state;
514 bacpy(&di.src, &dev->src);
515 bacpy(&di.dst, &dev->dst);
516
517 if (copy_to_user(arg, &di, sizeof(di)))
518 err = -EFAULT;
519
520 tty_port_put(&dev->port);
521 return err;
522}
523
524int rfcomm_dev_ioctl(struct sock *sk, unsigned int cmd, void __user *arg)
525{
526 BT_DBG("cmd %d arg %p", cmd, arg);
527
528 switch (cmd) {
529 case RFCOMMCREATEDEV:
530 return rfcomm_create_dev(sk, arg);
531
532 case RFCOMMRELEASEDEV:
533 return rfcomm_release_dev(arg);
534
535 case RFCOMMGETDEVLIST:
536 return rfcomm_get_dev_list(arg);
537
538 case RFCOMMGETDEVINFO:
539 return rfcomm_get_dev_info(arg);
540 }
541
542 return -EINVAL;
543}
544
545/* ---- DLC callbacks ---- */
546static void rfcomm_dev_data_ready(struct rfcomm_dlc *dlc, struct sk_buff *skb)
547{
548 struct rfcomm_dev *dev = dlc->owner;
549 struct tty_struct *tty;
550
551 if (!dev) {
552 kfree_skb(skb);
553 return;
554 }
555
556 tty = dev->port.tty;
557 if (!tty || !skb_queue_empty(&dev->pending)) {
558 skb_queue_tail(&dev->pending, skb);
559 return;
560 }
561
562 BT_DBG("dlc %p tty %p len %d", dlc, tty, skb->len);
563
564 tty_insert_flip_string(tty, skb->data, skb->len);
565 tty_flip_buffer_push(tty);
566
567 kfree_skb(skb);
568}
569
570static void rfcomm_dev_state_change(struct rfcomm_dlc *dlc, int err)
571{
572 struct rfcomm_dev *dev = dlc->owner;
573 if (!dev)
574 return;
575
576 BT_DBG("dlc %p dev %p err %d", dlc, dev, err);
577
578 dev->err = err;
579 wake_up_interruptible(&dev->wait);
580
581 if (dlc->state == BT_CLOSED) {
582 if (!dev->port.tty) {
583 if (test_bit(RFCOMM_RELEASE_ONHUP, &dev->flags)) {
584 /* Drop DLC lock here to avoid deadlock
585 * 1. rfcomm_dev_get will take rfcomm_dev_lock
586 * but in rfcomm_dev_add there's lock order:
587 * rfcomm_dev_lock -> dlc lock
588 * 2. tty_port_put will deadlock if it's
589 * the last reference
590 */
591 rfcomm_dlc_unlock(dlc);
592 if (rfcomm_dev_get(dev->id) == NULL) {
593 rfcomm_dlc_lock(dlc);
594 return;
595 }
596
597 rfcomm_dev_del(dev);
598 tty_port_put(&dev->port);
599 rfcomm_dlc_lock(dlc);
600 }
601 } else
602 tty_hangup(dev->port.tty);
603 }
604}
605
606static void rfcomm_dev_modem_status(struct rfcomm_dlc *dlc, u8 v24_sig)
607{
608 struct rfcomm_dev *dev = dlc->owner;
609 if (!dev)
610 return;
611
612 BT_DBG("dlc %p dev %p v24_sig 0x%02x", dlc, dev, v24_sig);
613
614 if ((dev->modem_status & TIOCM_CD) && !(v24_sig & RFCOMM_V24_DV)) {
615 if (dev->port.tty && !C_CLOCAL(dev->port.tty))
616 tty_hangup(dev->port.tty);
617 }
618
619 dev->modem_status =
620 ((v24_sig & RFCOMM_V24_RTC) ? (TIOCM_DSR | TIOCM_DTR) : 0) |
621 ((v24_sig & RFCOMM_V24_RTR) ? (TIOCM_RTS | TIOCM_CTS) : 0) |
622 ((v24_sig & RFCOMM_V24_IC) ? TIOCM_RI : 0) |
623 ((v24_sig & RFCOMM_V24_DV) ? TIOCM_CD : 0);
624}
625
626/* ---- TTY functions ---- */
627static void rfcomm_tty_copy_pending(struct rfcomm_dev *dev)
628{
629 struct tty_struct *tty = dev->port.tty;
630 struct sk_buff *skb;
631 int inserted = 0;
632
633 if (!tty)
634 return;
635
636 BT_DBG("dev %p tty %p", dev, tty);
637
638 rfcomm_dlc_lock(dev->dlc);
639
640 while ((skb = skb_dequeue(&dev->pending))) {
641 inserted += tty_insert_flip_string(tty, skb->data, skb->len);
642 kfree_skb(skb);
643 }
644
645 rfcomm_dlc_unlock(dev->dlc);
646
647 if (inserted > 0)
648 tty_flip_buffer_push(tty);
649}
650
651static int rfcomm_tty_open(struct tty_struct *tty, struct file *filp)
652{
653 DECLARE_WAITQUEUE(wait, current);
654 struct rfcomm_dev *dev;
655 struct rfcomm_dlc *dlc;
656 unsigned long flags;
657 int err, id;
658
659 id = tty->index;
660
661 BT_DBG("tty %p id %d", tty, id);
662
663 /* We don't leak this refcount. For reasons which are not entirely
664 clear, the TTY layer will call our ->close() method even if the
665 open fails. We decrease the refcount there, and decreasing it
666 here too would cause breakage. */
667 dev = rfcomm_dev_get(id);
668 if (!dev)
669 return -ENODEV;
670
671 BT_DBG("dev %p dst %s channel %d opened %d", dev, batostr(&dev->dst),
672 dev->channel, dev->port.count);
673
674 spin_lock_irqsave(&dev->port.lock, flags);
675 if (++dev->port.count > 1) {
676 spin_unlock_irqrestore(&dev->port.lock, flags);
677 return 0;
678 }
679 spin_unlock_irqrestore(&dev->port.lock, flags);
680
681 dlc = dev->dlc;
682
683 /* Attach TTY and open DLC */
684
685 rfcomm_dlc_lock(dlc);
686 tty->driver_data = dev;
687 dev->port.tty = tty;
688 rfcomm_dlc_unlock(dlc);
689 set_bit(RFCOMM_TTY_ATTACHED, &dev->flags);
690
691 err = rfcomm_dlc_open(dlc, &dev->src, &dev->dst, dev->channel);
692 if (err < 0)
693 return err;
694
695 /* Wait for DLC to connect */
696 add_wait_queue(&dev->wait, &wait);
697 while (1) {
698 set_current_state(TASK_INTERRUPTIBLE);
699
700 if (dlc->state == BT_CLOSED) {
701 err = -dev->err;
702 break;
703 }
704
705 if (dlc->state == BT_CONNECTED)
706 break;
707
708 if (signal_pending(current)) {
709 err = -EINTR;
710 break;
711 }
712
713 tty_unlock();
714 schedule();
715 tty_lock();
716 }
717 set_current_state(TASK_RUNNING);
718 remove_wait_queue(&dev->wait, &wait);
719
720 if (err == 0)
721 device_move(dev->tty_dev, rfcomm_get_device(dev),
722 DPM_ORDER_DEV_AFTER_PARENT);
723
724 rfcomm_tty_copy_pending(dev);
725
726 rfcomm_dlc_unthrottle(dev->dlc);
727
728 return err;
729}
730
731static void rfcomm_tty_close(struct tty_struct *tty, struct file *filp)
732{
733 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
734 unsigned long flags;
735
736 if (!dev)
737 return;
738
739 BT_DBG("tty %p dev %p dlc %p opened %d", tty, dev, dev->dlc,
740 dev->port.count);
741
742 spin_lock_irqsave(&dev->port.lock, flags);
743 if (!--dev->port.count) {
744 spin_unlock_irqrestore(&dev->port.lock, flags);
745 if (dev->tty_dev->parent)
746 device_move(dev->tty_dev, NULL, DPM_ORDER_DEV_LAST);
747
748 /* Close DLC and dettach TTY */
749 rfcomm_dlc_close(dev->dlc, 0);
750
751 clear_bit(RFCOMM_TTY_ATTACHED, &dev->flags);
752
753 rfcomm_dlc_lock(dev->dlc);
754 tty->driver_data = NULL;
755 dev->port.tty = NULL;
756 rfcomm_dlc_unlock(dev->dlc);
757
758 if (test_bit(RFCOMM_TTY_RELEASED, &dev->flags)) {
759 spin_lock(&rfcomm_dev_lock);
760 list_del_init(&dev->list);
761 spin_unlock(&rfcomm_dev_lock);
762
763 tty_port_put(&dev->port);
764 }
765 } else
766 spin_unlock_irqrestore(&dev->port.lock, flags);
767
768 tty_port_put(&dev->port);
769}
770
771static int rfcomm_tty_write(struct tty_struct *tty, const unsigned char *buf, int count)
772{
773 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
774 struct rfcomm_dlc *dlc = dev->dlc;
775 struct sk_buff *skb;
776 int err = 0, sent = 0, size;
777
778 BT_DBG("tty %p count %d", tty, count);
779
780 while (count) {
781 size = min_t(uint, count, dlc->mtu);
782
783 skb = rfcomm_wmalloc(dev, size + RFCOMM_SKB_RESERVE, GFP_ATOMIC);
784
785 if (!skb)
786 break;
787
788 skb_reserve(skb, RFCOMM_SKB_HEAD_RESERVE);
789
790 memcpy(skb_put(skb, size), buf + sent, size);
791
792 err = rfcomm_dlc_send(dlc, skb);
793 if (err < 0) {
794 kfree_skb(skb);
795 break;
796 }
797
798 sent += size;
799 count -= size;
800 }
801
802 return sent ? sent : err;
803}
804
805static int rfcomm_tty_write_room(struct tty_struct *tty)
806{
807 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
808 int room;
809
810 BT_DBG("tty %p", tty);
811
812 if (!dev || !dev->dlc)
813 return 0;
814
815 room = rfcomm_room(dev->dlc) - atomic_read(&dev->wmem_alloc);
816 if (room < 0)
817 room = 0;
818
819 return room;
820}
821
822static int rfcomm_tty_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg)
823{
824 BT_DBG("tty %p cmd 0x%02x", tty, cmd);
825
826 switch (cmd) {
827 case TCGETS:
828 BT_DBG("TCGETS is not supported");
829 return -ENOIOCTLCMD;
830
831 case TCSETS:
832 BT_DBG("TCSETS is not supported");
833 return -ENOIOCTLCMD;
834
835 case TIOCMIWAIT:
836 BT_DBG("TIOCMIWAIT");
837 break;
838
839 case TIOCGSERIAL:
840 BT_ERR("TIOCGSERIAL is not supported");
841 return -ENOIOCTLCMD;
842
843 case TIOCSSERIAL:
844 BT_ERR("TIOCSSERIAL is not supported");
845 return -ENOIOCTLCMD;
846
847 case TIOCSERGSTRUCT:
848 BT_ERR("TIOCSERGSTRUCT is not supported");
849 return -ENOIOCTLCMD;
850
851 case TIOCSERGETLSR:
852 BT_ERR("TIOCSERGETLSR is not supported");
853 return -ENOIOCTLCMD;
854
855 case TIOCSERCONFIG:
856 BT_ERR("TIOCSERCONFIG is not supported");
857 return -ENOIOCTLCMD;
858
859 default:
860 return -ENOIOCTLCMD; /* ioctls which we must ignore */
861
862 }
863
864 return -ENOIOCTLCMD;
865}
866
867static void rfcomm_tty_set_termios(struct tty_struct *tty, struct ktermios *old)
868{
869 struct ktermios *new = tty->termios;
870 int old_baud_rate = tty_termios_baud_rate(old);
871 int new_baud_rate = tty_termios_baud_rate(new);
872
873 u8 baud, data_bits, stop_bits, parity, x_on, x_off;
874 u16 changes = 0;
875
876 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
877
878 BT_DBG("tty %p termios %p", tty, old);
879
880 if (!dev || !dev->dlc || !dev->dlc->session)
881 return;
882
883 /* Handle turning off CRTSCTS */
884 if ((old->c_cflag & CRTSCTS) && !(new->c_cflag & CRTSCTS))
885 BT_DBG("Turning off CRTSCTS unsupported");
886
887 /* Parity on/off and when on, odd/even */
888 if (((old->c_cflag & PARENB) != (new->c_cflag & PARENB)) ||
889 ((old->c_cflag & PARODD) != (new->c_cflag & PARODD))) {
890 changes |= RFCOMM_RPN_PM_PARITY;
891 BT_DBG("Parity change detected.");
892 }
893
894 /* Mark and space parity are not supported! */
895 if (new->c_cflag & PARENB) {
896 if (new->c_cflag & PARODD) {
897 BT_DBG("Parity is ODD");
898 parity = RFCOMM_RPN_PARITY_ODD;
899 } else {
900 BT_DBG("Parity is EVEN");
901 parity = RFCOMM_RPN_PARITY_EVEN;
902 }
903 } else {
904 BT_DBG("Parity is OFF");
905 parity = RFCOMM_RPN_PARITY_NONE;
906 }
907
908 /* Setting the x_on / x_off characters */
909 if (old->c_cc[VSTOP] != new->c_cc[VSTOP]) {
910 BT_DBG("XOFF custom");
911 x_on = new->c_cc[VSTOP];
912 changes |= RFCOMM_RPN_PM_XON;
913 } else {
914 BT_DBG("XOFF default");
915 x_on = RFCOMM_RPN_XON_CHAR;
916 }
917
918 if (old->c_cc[VSTART] != new->c_cc[VSTART]) {
919 BT_DBG("XON custom");
920 x_off = new->c_cc[VSTART];
921 changes |= RFCOMM_RPN_PM_XOFF;
922 } else {
923 BT_DBG("XON default");
924 x_off = RFCOMM_RPN_XOFF_CHAR;
925 }
926
927 /* Handle setting of stop bits */
928 if ((old->c_cflag & CSTOPB) != (new->c_cflag & CSTOPB))
929 changes |= RFCOMM_RPN_PM_STOP;
930
931 /* POSIX does not support 1.5 stop bits and RFCOMM does not
932 * support 2 stop bits. So a request for 2 stop bits gets
933 * translated to 1.5 stop bits */
934 if (new->c_cflag & CSTOPB)
935 stop_bits = RFCOMM_RPN_STOP_15;
936 else
937 stop_bits = RFCOMM_RPN_STOP_1;
938
939 /* Handle number of data bits [5-8] */
940 if ((old->c_cflag & CSIZE) != (new->c_cflag & CSIZE))
941 changes |= RFCOMM_RPN_PM_DATA;
942
943 switch (new->c_cflag & CSIZE) {
944 case CS5:
945 data_bits = RFCOMM_RPN_DATA_5;
946 break;
947 case CS6:
948 data_bits = RFCOMM_RPN_DATA_6;
949 break;
950 case CS7:
951 data_bits = RFCOMM_RPN_DATA_7;
952 break;
953 case CS8:
954 data_bits = RFCOMM_RPN_DATA_8;
955 break;
956 default:
957 data_bits = RFCOMM_RPN_DATA_8;
958 break;
959 }
960
961 /* Handle baudrate settings */
962 if (old_baud_rate != new_baud_rate)
963 changes |= RFCOMM_RPN_PM_BITRATE;
964
965 switch (new_baud_rate) {
966 case 2400:
967 baud = RFCOMM_RPN_BR_2400;
968 break;
969 case 4800:
970 baud = RFCOMM_RPN_BR_4800;
971 break;
972 case 7200:
973 baud = RFCOMM_RPN_BR_7200;
974 break;
975 case 9600:
976 baud = RFCOMM_RPN_BR_9600;
977 break;
978 case 19200:
979 baud = RFCOMM_RPN_BR_19200;
980 break;
981 case 38400:
982 baud = RFCOMM_RPN_BR_38400;
983 break;
984 case 57600:
985 baud = RFCOMM_RPN_BR_57600;
986 break;
987 case 115200:
988 baud = RFCOMM_RPN_BR_115200;
989 break;
990 case 230400:
991 baud = RFCOMM_RPN_BR_230400;
992 break;
993 default:
994 /* 9600 is standard accordinag to the RFCOMM specification */
995 baud = RFCOMM_RPN_BR_9600;
996 break;
997
998 }
999
1000 if (changes)
1001 rfcomm_send_rpn(dev->dlc->session, 1, dev->dlc->dlci, baud,
1002 data_bits, stop_bits, parity,
1003 RFCOMM_RPN_FLOW_NONE, x_on, x_off, changes);
1004}
1005
1006static void rfcomm_tty_throttle(struct tty_struct *tty)
1007{
1008 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
1009
1010 BT_DBG("tty %p dev %p", tty, dev);
1011
1012 rfcomm_dlc_throttle(dev->dlc);
1013}
1014
1015static void rfcomm_tty_unthrottle(struct tty_struct *tty)
1016{
1017 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
1018
1019 BT_DBG("tty %p dev %p", tty, dev);
1020
1021 rfcomm_dlc_unthrottle(dev->dlc);
1022}
1023
1024static int rfcomm_tty_chars_in_buffer(struct tty_struct *tty)
1025{
1026 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
1027
1028 BT_DBG("tty %p dev %p", tty, dev);
1029
1030 if (!dev || !dev->dlc)
1031 return 0;
1032
1033 if (!skb_queue_empty(&dev->dlc->tx_queue))
1034 return dev->dlc->mtu;
1035
1036 return 0;
1037}
1038
1039static void rfcomm_tty_flush_buffer(struct tty_struct *tty)
1040{
1041 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
1042
1043 BT_DBG("tty %p dev %p", tty, dev);
1044
1045 if (!dev || !dev->dlc)
1046 return;
1047
1048 skb_queue_purge(&dev->dlc->tx_queue);
1049 tty_wakeup(tty);
1050}
1051
1052static void rfcomm_tty_send_xchar(struct tty_struct *tty, char ch)
1053{
1054 BT_DBG("tty %p ch %c", tty, ch);
1055}
1056
1057static void rfcomm_tty_wait_until_sent(struct tty_struct *tty, int timeout)
1058{
1059 BT_DBG("tty %p timeout %d", tty, timeout);
1060}
1061
1062static void rfcomm_tty_hangup(struct tty_struct *tty)
1063{
1064 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
1065
1066 BT_DBG("tty %p dev %p", tty, dev);
1067
1068 if (!dev)
1069 return;
1070
1071 rfcomm_tty_flush_buffer(tty);
1072
1073 if (test_bit(RFCOMM_RELEASE_ONHUP, &dev->flags)) {
1074 if (rfcomm_dev_get(dev->id) == NULL)
1075 return;
1076 rfcomm_dev_del(dev);
1077 tty_port_put(&dev->port);
1078 }
1079}
1080
1081static int rfcomm_tty_tiocmget(struct tty_struct *tty)
1082{
1083 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
1084
1085 BT_DBG("tty %p dev %p", tty, dev);
1086
1087 return dev->modem_status;
1088}
1089
1090static int rfcomm_tty_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear)
1091{
1092 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
1093 struct rfcomm_dlc *dlc = dev->dlc;
1094 u8 v24_sig;
1095
1096 BT_DBG("tty %p dev %p set 0x%02x clear 0x%02x", tty, dev, set, clear);
1097
1098 rfcomm_dlc_get_modem_status(dlc, &v24_sig);
1099
1100 if (set & TIOCM_DSR || set & TIOCM_DTR)
1101 v24_sig |= RFCOMM_V24_RTC;
1102 if (set & TIOCM_RTS || set & TIOCM_CTS)
1103 v24_sig |= RFCOMM_V24_RTR;
1104 if (set & TIOCM_RI)
1105 v24_sig |= RFCOMM_V24_IC;
1106 if (set & TIOCM_CD)
1107 v24_sig |= RFCOMM_V24_DV;
1108
1109 if (clear & TIOCM_DSR || clear & TIOCM_DTR)
1110 v24_sig &= ~RFCOMM_V24_RTC;
1111 if (clear & TIOCM_RTS || clear & TIOCM_CTS)
1112 v24_sig &= ~RFCOMM_V24_RTR;
1113 if (clear & TIOCM_RI)
1114 v24_sig &= ~RFCOMM_V24_IC;
1115 if (clear & TIOCM_CD)
1116 v24_sig &= ~RFCOMM_V24_DV;
1117
1118 rfcomm_dlc_set_modem_status(dlc, v24_sig);
1119
1120 return 0;
1121}
1122
1123/* ---- TTY structure ---- */
1124
1125static const struct tty_operations rfcomm_ops = {
1126 .open = rfcomm_tty_open,
1127 .close = rfcomm_tty_close,
1128 .write = rfcomm_tty_write,
1129 .write_room = rfcomm_tty_write_room,
1130 .chars_in_buffer = rfcomm_tty_chars_in_buffer,
1131 .flush_buffer = rfcomm_tty_flush_buffer,
1132 .ioctl = rfcomm_tty_ioctl,
1133 .throttle = rfcomm_tty_throttle,
1134 .unthrottle = rfcomm_tty_unthrottle,
1135 .set_termios = rfcomm_tty_set_termios,
1136 .send_xchar = rfcomm_tty_send_xchar,
1137 .hangup = rfcomm_tty_hangup,
1138 .wait_until_sent = rfcomm_tty_wait_until_sent,
1139 .tiocmget = rfcomm_tty_tiocmget,
1140 .tiocmset = rfcomm_tty_tiocmset,
1141};
1142
1143int __init rfcomm_init_ttys(void)
1144{
1145 int error;
1146
1147 rfcomm_tty_driver = alloc_tty_driver(RFCOMM_TTY_PORTS);
1148 if (!rfcomm_tty_driver)
1149 return -ENOMEM;
1150
1151 rfcomm_tty_driver->driver_name = "rfcomm";
1152 rfcomm_tty_driver->name = "rfcomm";
1153 rfcomm_tty_driver->major = RFCOMM_TTY_MAJOR;
1154 rfcomm_tty_driver->minor_start = RFCOMM_TTY_MINOR;
1155 rfcomm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
1156 rfcomm_tty_driver->subtype = SERIAL_TYPE_NORMAL;
1157 rfcomm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1158 rfcomm_tty_driver->init_termios = tty_std_termios;
1159 rfcomm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1160 rfcomm_tty_driver->init_termios.c_lflag &= ~ICANON;
1161 tty_set_operations(rfcomm_tty_driver, &rfcomm_ops);
1162
1163 error = tty_register_driver(rfcomm_tty_driver);
1164 if (error) {
1165 BT_ERR("Can't register RFCOMM TTY driver");
1166 put_tty_driver(rfcomm_tty_driver);
1167 return error;
1168 }
1169
1170 BT_INFO("RFCOMM TTY layer initialized");
1171
1172 return 0;
1173}
1174
1175void rfcomm_cleanup_ttys(void)
1176{
1177 tty_unregister_driver(rfcomm_tty_driver);
1178 put_tty_driver(rfcomm_tty_driver);
1179}
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
28#include <linux/module.h>
29
30#include <linux/tty.h>
31#include <linux/tty_driver.h>
32#include <linux/tty_flip.h>
33
34#include <linux/capability.h>
35#include <linux/slab.h>
36#include <linux/skbuff.h>
37
38#include <net/bluetooth/bluetooth.h>
39#include <net/bluetooth/hci_core.h>
40#include <net/bluetooth/rfcomm.h>
41
42#define RFCOMM_TTY_MAGIC 0x6d02 /* magic number for rfcomm struct */
43#define RFCOMM_TTY_PORTS RFCOMM_MAX_DEV /* whole lotta rfcomm devices */
44#define RFCOMM_TTY_MAJOR 216 /* device node major id of the usb/bluetooth.c driver */
45#define RFCOMM_TTY_MINOR 0
46
47static struct tty_driver *rfcomm_tty_driver;
48
49struct rfcomm_dev {
50 struct list_head list;
51 atomic_t refcnt;
52
53 char name[12];
54 int id;
55 unsigned long flags;
56 atomic_t opened;
57 int err;
58
59 bdaddr_t src;
60 bdaddr_t dst;
61 u8 channel;
62
63 uint modem_status;
64
65 struct rfcomm_dlc *dlc;
66 struct tty_struct *tty;
67 wait_queue_head_t wait;
68 struct tasklet_struct wakeup_task;
69
70 struct device *tty_dev;
71
72 atomic_t wmem_alloc;
73
74 struct sk_buff_head pending;
75};
76
77static LIST_HEAD(rfcomm_dev_list);
78static DEFINE_RWLOCK(rfcomm_dev_lock);
79
80static void rfcomm_dev_data_ready(struct rfcomm_dlc *dlc, struct sk_buff *skb);
81static void rfcomm_dev_state_change(struct rfcomm_dlc *dlc, int err);
82static void rfcomm_dev_modem_status(struct rfcomm_dlc *dlc, u8 v24_sig);
83
84static void rfcomm_tty_wakeup(unsigned long arg);
85
86/* ---- Device functions ---- */
87static void rfcomm_dev_destruct(struct rfcomm_dev *dev)
88{
89 struct rfcomm_dlc *dlc = dev->dlc;
90
91 BT_DBG("dev %p dlc %p", dev, dlc);
92
93 /* Refcount should only hit zero when called from rfcomm_dev_del()
94 which will have taken us off the list. Everything else are
95 refcounting bugs. */
96 BUG_ON(!list_empty(&dev->list));
97
98 rfcomm_dlc_lock(dlc);
99 /* Detach DLC if it's owned by this dev */
100 if (dlc->owner == dev)
101 dlc->owner = NULL;
102 rfcomm_dlc_unlock(dlc);
103
104 rfcomm_dlc_put(dlc);
105
106 tty_unregister_device(rfcomm_tty_driver, dev->id);
107
108 kfree(dev);
109
110 /* It's safe to call module_put() here because socket still
111 holds reference to this module. */
112 module_put(THIS_MODULE);
113}
114
115static inline void rfcomm_dev_hold(struct rfcomm_dev *dev)
116{
117 atomic_inc(&dev->refcnt);
118}
119
120static inline void rfcomm_dev_put(struct rfcomm_dev *dev)
121{
122 /* The reason this isn't actually a race, as you no
123 doubt have a little voice screaming at you in your
124 head, is that the refcount should never actually
125 reach zero unless the device has already been taken
126 off the list, in rfcomm_dev_del(). And if that's not
127 true, we'll hit the BUG() in rfcomm_dev_destruct()
128 anyway. */
129 if (atomic_dec_and_test(&dev->refcnt))
130 rfcomm_dev_destruct(dev);
131}
132
133static struct rfcomm_dev *__rfcomm_dev_get(int id)
134{
135 struct rfcomm_dev *dev;
136 struct list_head *p;
137
138 list_for_each(p, &rfcomm_dev_list) {
139 dev = list_entry(p, struct rfcomm_dev, list);
140 if (dev->id == id)
141 return dev;
142 }
143
144 return NULL;
145}
146
147static inline struct rfcomm_dev *rfcomm_dev_get(int id)
148{
149 struct rfcomm_dev *dev;
150
151 read_lock(&rfcomm_dev_lock);
152
153 dev = __rfcomm_dev_get(id);
154
155 if (dev) {
156 if (test_bit(RFCOMM_TTY_RELEASED, &dev->flags))
157 dev = NULL;
158 else
159 rfcomm_dev_hold(dev);
160 }
161
162 read_unlock(&rfcomm_dev_lock);
163
164 return dev;
165}
166
167static struct device *rfcomm_get_device(struct rfcomm_dev *dev)
168{
169 struct hci_dev *hdev;
170 struct hci_conn *conn;
171
172 hdev = hci_get_route(&dev->dst, &dev->src);
173 if (!hdev)
174 return NULL;
175
176 conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &dev->dst);
177
178 hci_dev_put(hdev);
179
180 return conn ? &conn->dev : NULL;
181}
182
183static ssize_t show_address(struct device *tty_dev, struct device_attribute *attr, char *buf)
184{
185 struct rfcomm_dev *dev = dev_get_drvdata(tty_dev);
186 return sprintf(buf, "%s\n", batostr(&dev->dst));
187}
188
189static ssize_t show_channel(struct device *tty_dev, struct device_attribute *attr, char *buf)
190{
191 struct rfcomm_dev *dev = dev_get_drvdata(tty_dev);
192 return sprintf(buf, "%d\n", dev->channel);
193}
194
195static DEVICE_ATTR(address, S_IRUGO, show_address, NULL);
196static DEVICE_ATTR(channel, S_IRUGO, show_channel, NULL);
197
198static int rfcomm_dev_add(struct rfcomm_dev_req *req, struct rfcomm_dlc *dlc)
199{
200 struct rfcomm_dev *dev;
201 struct list_head *head = &rfcomm_dev_list, *p;
202 int err = 0;
203
204 BT_DBG("id %d channel %d", req->dev_id, req->channel);
205
206 dev = kzalloc(sizeof(struct rfcomm_dev), GFP_KERNEL);
207 if (!dev)
208 return -ENOMEM;
209
210 write_lock_bh(&rfcomm_dev_lock);
211
212 if (req->dev_id < 0) {
213 dev->id = 0;
214
215 list_for_each(p, &rfcomm_dev_list) {
216 if (list_entry(p, struct rfcomm_dev, list)->id != dev->id)
217 break;
218
219 dev->id++;
220 head = p;
221 }
222 } else {
223 dev->id = req->dev_id;
224
225 list_for_each(p, &rfcomm_dev_list) {
226 struct rfcomm_dev *entry = list_entry(p, struct rfcomm_dev, list);
227
228 if (entry->id == dev->id) {
229 err = -EADDRINUSE;
230 goto out;
231 }
232
233 if (entry->id > dev->id - 1)
234 break;
235
236 head = p;
237 }
238 }
239
240 if ((dev->id < 0) || (dev->id > RFCOMM_MAX_DEV - 1)) {
241 err = -ENFILE;
242 goto out;
243 }
244
245 sprintf(dev->name, "rfcomm%d", dev->id);
246
247 list_add(&dev->list, head);
248 atomic_set(&dev->refcnt, 1);
249
250 bacpy(&dev->src, &req->src);
251 bacpy(&dev->dst, &req->dst);
252 dev->channel = req->channel;
253
254 dev->flags = req->flags &
255 ((1 << RFCOMM_RELEASE_ONHUP) | (1 << RFCOMM_REUSE_DLC));
256
257 atomic_set(&dev->opened, 0);
258
259 init_waitqueue_head(&dev->wait);
260 tasklet_init(&dev->wakeup_task, rfcomm_tty_wakeup, (unsigned long) dev);
261
262 skb_queue_head_init(&dev->pending);
263
264 rfcomm_dlc_lock(dlc);
265
266 if (req->flags & (1 << RFCOMM_REUSE_DLC)) {
267 struct sock *sk = dlc->owner;
268 struct sk_buff *skb;
269
270 BUG_ON(!sk);
271
272 rfcomm_dlc_throttle(dlc);
273
274 while ((skb = skb_dequeue(&sk->sk_receive_queue))) {
275 skb_orphan(skb);
276 skb_queue_tail(&dev->pending, skb);
277 atomic_sub(skb->len, &sk->sk_rmem_alloc);
278 }
279 }
280
281 dlc->data_ready = rfcomm_dev_data_ready;
282 dlc->state_change = rfcomm_dev_state_change;
283 dlc->modem_status = rfcomm_dev_modem_status;
284
285 dlc->owner = dev;
286 dev->dlc = dlc;
287
288 rfcomm_dev_modem_status(dlc, dlc->remote_v24_sig);
289
290 rfcomm_dlc_unlock(dlc);
291
292 /* It's safe to call __module_get() here because socket already
293 holds reference to this module. */
294 __module_get(THIS_MODULE);
295
296out:
297 write_unlock_bh(&rfcomm_dev_lock);
298
299 if (err < 0)
300 goto free;
301
302 dev->tty_dev = tty_register_device(rfcomm_tty_driver, dev->id, NULL);
303
304 if (IS_ERR(dev->tty_dev)) {
305 err = PTR_ERR(dev->tty_dev);
306 list_del(&dev->list);
307 goto free;
308 }
309
310 dev_set_drvdata(dev->tty_dev, dev);
311
312 if (device_create_file(dev->tty_dev, &dev_attr_address) < 0)
313 BT_ERR("Failed to create address attribute");
314
315 if (device_create_file(dev->tty_dev, &dev_attr_channel) < 0)
316 BT_ERR("Failed to create channel attribute");
317
318 return dev->id;
319
320free:
321 kfree(dev);
322 return err;
323}
324
325static void rfcomm_dev_del(struct rfcomm_dev *dev)
326{
327 BT_DBG("dev %p", dev);
328
329 BUG_ON(test_and_set_bit(RFCOMM_TTY_RELEASED, &dev->flags));
330
331 if (atomic_read(&dev->opened) > 0)
332 return;
333
334 write_lock_bh(&rfcomm_dev_lock);
335 list_del_init(&dev->list);
336 write_unlock_bh(&rfcomm_dev_lock);
337
338 rfcomm_dev_put(dev);
339}
340
341/* ---- Send buffer ---- */
342static inline unsigned int rfcomm_room(struct rfcomm_dlc *dlc)
343{
344 /* We can't let it be zero, because we don't get a callback
345 when tx_credits becomes nonzero, hence we'd never wake up */
346 return dlc->mtu * (dlc->tx_credits?:1);
347}
348
349static void rfcomm_wfree(struct sk_buff *skb)
350{
351 struct rfcomm_dev *dev = (void *) skb->sk;
352 atomic_sub(skb->truesize, &dev->wmem_alloc);
353 if (test_bit(RFCOMM_TTY_ATTACHED, &dev->flags))
354 tasklet_schedule(&dev->wakeup_task);
355 rfcomm_dev_put(dev);
356}
357
358static inline void rfcomm_set_owner_w(struct sk_buff *skb, struct rfcomm_dev *dev)
359{
360 rfcomm_dev_hold(dev);
361 atomic_add(skb->truesize, &dev->wmem_alloc);
362 skb->sk = (void *) dev;
363 skb->destructor = rfcomm_wfree;
364}
365
366static struct sk_buff *rfcomm_wmalloc(struct rfcomm_dev *dev, unsigned long size, gfp_t priority)
367{
368 if (atomic_read(&dev->wmem_alloc) < rfcomm_room(dev->dlc)) {
369 struct sk_buff *skb = alloc_skb(size, priority);
370 if (skb) {
371 rfcomm_set_owner_w(skb, dev);
372 return skb;
373 }
374 }
375 return NULL;
376}
377
378/* ---- Device IOCTLs ---- */
379
380#define NOCAP_FLAGS ((1 << RFCOMM_REUSE_DLC) | (1 << RFCOMM_RELEASE_ONHUP))
381
382static int rfcomm_create_dev(struct sock *sk, void __user *arg)
383{
384 struct rfcomm_dev_req req;
385 struct rfcomm_dlc *dlc;
386 int id;
387
388 if (copy_from_user(&req, arg, sizeof(req)))
389 return -EFAULT;
390
391 BT_DBG("sk %p dev_id %d flags 0x%x", sk, req.dev_id, req.flags);
392
393 if (req.flags != NOCAP_FLAGS && !capable(CAP_NET_ADMIN))
394 return -EPERM;
395
396 if (req.flags & (1 << RFCOMM_REUSE_DLC)) {
397 /* Socket must be connected */
398 if (sk->sk_state != BT_CONNECTED)
399 return -EBADFD;
400
401 dlc = rfcomm_pi(sk)->dlc;
402 rfcomm_dlc_hold(dlc);
403 } else {
404 dlc = rfcomm_dlc_alloc(GFP_KERNEL);
405 if (!dlc)
406 return -ENOMEM;
407 }
408
409 id = rfcomm_dev_add(&req, dlc);
410 if (id < 0) {
411 rfcomm_dlc_put(dlc);
412 return id;
413 }
414
415 if (req.flags & (1 << RFCOMM_REUSE_DLC)) {
416 /* DLC is now used by device.
417 * Socket must be disconnected */
418 sk->sk_state = BT_CLOSED;
419 }
420
421 return id;
422}
423
424static int rfcomm_release_dev(void __user *arg)
425{
426 struct rfcomm_dev_req req;
427 struct rfcomm_dev *dev;
428
429 if (copy_from_user(&req, arg, sizeof(req)))
430 return -EFAULT;
431
432 BT_DBG("dev_id %d flags 0x%x", req.dev_id, req.flags);
433
434 dev = rfcomm_dev_get(req.dev_id);
435 if (!dev)
436 return -ENODEV;
437
438 if (dev->flags != NOCAP_FLAGS && !capable(CAP_NET_ADMIN)) {
439 rfcomm_dev_put(dev);
440 return -EPERM;
441 }
442
443 if (req.flags & (1 << RFCOMM_HANGUP_NOW))
444 rfcomm_dlc_close(dev->dlc, 0);
445
446 /* Shut down TTY synchronously before freeing rfcomm_dev */
447 if (dev->tty)
448 tty_vhangup(dev->tty);
449
450 if (!test_bit(RFCOMM_RELEASE_ONHUP, &dev->flags))
451 rfcomm_dev_del(dev);
452 rfcomm_dev_put(dev);
453 return 0;
454}
455
456static int rfcomm_get_dev_list(void __user *arg)
457{
458 struct rfcomm_dev_list_req *dl;
459 struct rfcomm_dev_info *di;
460 struct list_head *p;
461 int n = 0, size, err;
462 u16 dev_num;
463
464 BT_DBG("");
465
466 if (get_user(dev_num, (u16 __user *) arg))
467 return -EFAULT;
468
469 if (!dev_num || dev_num > (PAGE_SIZE * 4) / sizeof(*di))
470 return -EINVAL;
471
472 size = sizeof(*dl) + dev_num * sizeof(*di);
473
474 dl = kmalloc(size, GFP_KERNEL);
475 if (!dl)
476 return -ENOMEM;
477
478 di = dl->dev_info;
479
480 read_lock_bh(&rfcomm_dev_lock);
481
482 list_for_each(p, &rfcomm_dev_list) {
483 struct rfcomm_dev *dev = list_entry(p, struct rfcomm_dev, list);
484 if (test_bit(RFCOMM_TTY_RELEASED, &dev->flags))
485 continue;
486 (di + n)->id = dev->id;
487 (di + n)->flags = dev->flags;
488 (di + n)->state = dev->dlc->state;
489 (di + n)->channel = dev->channel;
490 bacpy(&(di + n)->src, &dev->src);
491 bacpy(&(di + n)->dst, &dev->dst);
492 if (++n >= dev_num)
493 break;
494 }
495
496 read_unlock_bh(&rfcomm_dev_lock);
497
498 dl->dev_num = n;
499 size = sizeof(*dl) + n * sizeof(*di);
500
501 err = copy_to_user(arg, dl, size);
502 kfree(dl);
503
504 return err ? -EFAULT : 0;
505}
506
507static int rfcomm_get_dev_info(void __user *arg)
508{
509 struct rfcomm_dev *dev;
510 struct rfcomm_dev_info di;
511 int err = 0;
512
513 BT_DBG("");
514
515 if (copy_from_user(&di, arg, sizeof(di)))
516 return -EFAULT;
517
518 dev = rfcomm_dev_get(di.id);
519 if (!dev)
520 return -ENODEV;
521
522 di.flags = dev->flags;
523 di.channel = dev->channel;
524 di.state = dev->dlc->state;
525 bacpy(&di.src, &dev->src);
526 bacpy(&di.dst, &dev->dst);
527
528 if (copy_to_user(arg, &di, sizeof(di)))
529 err = -EFAULT;
530
531 rfcomm_dev_put(dev);
532 return err;
533}
534
535int rfcomm_dev_ioctl(struct sock *sk, unsigned int cmd, void __user *arg)
536{
537 BT_DBG("cmd %d arg %p", cmd, arg);
538
539 switch (cmd) {
540 case RFCOMMCREATEDEV:
541 return rfcomm_create_dev(sk, arg);
542
543 case RFCOMMRELEASEDEV:
544 return rfcomm_release_dev(arg);
545
546 case RFCOMMGETDEVLIST:
547 return rfcomm_get_dev_list(arg);
548
549 case RFCOMMGETDEVINFO:
550 return rfcomm_get_dev_info(arg);
551 }
552
553 return -EINVAL;
554}
555
556/* ---- DLC callbacks ---- */
557static void rfcomm_dev_data_ready(struct rfcomm_dlc *dlc, struct sk_buff *skb)
558{
559 struct rfcomm_dev *dev = dlc->owner;
560 struct tty_struct *tty;
561
562 if (!dev) {
563 kfree_skb(skb);
564 return;
565 }
566
567 tty = dev->tty;
568 if (!tty || !skb_queue_empty(&dev->pending)) {
569 skb_queue_tail(&dev->pending, skb);
570 return;
571 }
572
573 BT_DBG("dlc %p tty %p len %d", dlc, tty, skb->len);
574
575 tty_insert_flip_string(tty, skb->data, skb->len);
576 tty_flip_buffer_push(tty);
577
578 kfree_skb(skb);
579}
580
581static void rfcomm_dev_state_change(struct rfcomm_dlc *dlc, int err)
582{
583 struct rfcomm_dev *dev = dlc->owner;
584 if (!dev)
585 return;
586
587 BT_DBG("dlc %p dev %p err %d", dlc, dev, err);
588
589 dev->err = err;
590 wake_up_interruptible(&dev->wait);
591
592 if (dlc->state == BT_CLOSED) {
593 if (!dev->tty) {
594 if (test_bit(RFCOMM_RELEASE_ONHUP, &dev->flags)) {
595 /* Drop DLC lock here to avoid deadlock
596 * 1. rfcomm_dev_get will take rfcomm_dev_lock
597 * but in rfcomm_dev_add there's lock order:
598 * rfcomm_dev_lock -> dlc lock
599 * 2. rfcomm_dev_put will deadlock if it's
600 * the last reference
601 */
602 rfcomm_dlc_unlock(dlc);
603 if (rfcomm_dev_get(dev->id) == NULL) {
604 rfcomm_dlc_lock(dlc);
605 return;
606 }
607
608 rfcomm_dev_del(dev);
609 rfcomm_dev_put(dev);
610 rfcomm_dlc_lock(dlc);
611 }
612 } else
613 tty_hangup(dev->tty);
614 }
615}
616
617static void rfcomm_dev_modem_status(struct rfcomm_dlc *dlc, u8 v24_sig)
618{
619 struct rfcomm_dev *dev = dlc->owner;
620 if (!dev)
621 return;
622
623 BT_DBG("dlc %p dev %p v24_sig 0x%02x", dlc, dev, v24_sig);
624
625 if ((dev->modem_status & TIOCM_CD) && !(v24_sig & RFCOMM_V24_DV)) {
626 if (dev->tty && !C_CLOCAL(dev->tty))
627 tty_hangup(dev->tty);
628 }
629
630 dev->modem_status =
631 ((v24_sig & RFCOMM_V24_RTC) ? (TIOCM_DSR | TIOCM_DTR) : 0) |
632 ((v24_sig & RFCOMM_V24_RTR) ? (TIOCM_RTS | TIOCM_CTS) : 0) |
633 ((v24_sig & RFCOMM_V24_IC) ? TIOCM_RI : 0) |
634 ((v24_sig & RFCOMM_V24_DV) ? TIOCM_CD : 0);
635}
636
637/* ---- TTY functions ---- */
638static void rfcomm_tty_wakeup(unsigned long arg)
639{
640 struct rfcomm_dev *dev = (void *) arg;
641 struct tty_struct *tty = dev->tty;
642 if (!tty)
643 return;
644
645 BT_DBG("dev %p tty %p", dev, tty);
646 tty_wakeup(tty);
647}
648
649static void rfcomm_tty_copy_pending(struct rfcomm_dev *dev)
650{
651 struct tty_struct *tty = dev->tty;
652 struct sk_buff *skb;
653 int inserted = 0;
654
655 if (!tty)
656 return;
657
658 BT_DBG("dev %p tty %p", dev, tty);
659
660 rfcomm_dlc_lock(dev->dlc);
661
662 while ((skb = skb_dequeue(&dev->pending))) {
663 inserted += tty_insert_flip_string(tty, skb->data, skb->len);
664 kfree_skb(skb);
665 }
666
667 rfcomm_dlc_unlock(dev->dlc);
668
669 if (inserted > 0)
670 tty_flip_buffer_push(tty);
671}
672
673static int rfcomm_tty_open(struct tty_struct *tty, struct file *filp)
674{
675 DECLARE_WAITQUEUE(wait, current);
676 struct rfcomm_dev *dev;
677 struct rfcomm_dlc *dlc;
678 int err, id;
679
680 id = tty->index;
681
682 BT_DBG("tty %p id %d", tty, id);
683
684 /* We don't leak this refcount. For reasons which are not entirely
685 clear, the TTY layer will call our ->close() method even if the
686 open fails. We decrease the refcount there, and decreasing it
687 here too would cause breakage. */
688 dev = rfcomm_dev_get(id);
689 if (!dev)
690 return -ENODEV;
691
692 BT_DBG("dev %p dst %s channel %d opened %d", dev, batostr(&dev->dst),
693 dev->channel, atomic_read(&dev->opened));
694
695 if (atomic_inc_return(&dev->opened) > 1)
696 return 0;
697
698 dlc = dev->dlc;
699
700 /* Attach TTY and open DLC */
701
702 rfcomm_dlc_lock(dlc);
703 tty->driver_data = dev;
704 dev->tty = tty;
705 rfcomm_dlc_unlock(dlc);
706 set_bit(RFCOMM_TTY_ATTACHED, &dev->flags);
707
708 err = rfcomm_dlc_open(dlc, &dev->src, &dev->dst, dev->channel);
709 if (err < 0)
710 return err;
711
712 /* Wait for DLC to connect */
713 add_wait_queue(&dev->wait, &wait);
714 while (1) {
715 set_current_state(TASK_INTERRUPTIBLE);
716
717 if (dlc->state == BT_CLOSED) {
718 err = -dev->err;
719 break;
720 }
721
722 if (dlc->state == BT_CONNECTED)
723 break;
724
725 if (signal_pending(current)) {
726 err = -EINTR;
727 break;
728 }
729
730 tty_unlock();
731 schedule();
732 tty_lock();
733 }
734 set_current_state(TASK_RUNNING);
735 remove_wait_queue(&dev->wait, &wait);
736
737 if (err == 0)
738 device_move(dev->tty_dev, rfcomm_get_device(dev),
739 DPM_ORDER_DEV_AFTER_PARENT);
740
741 rfcomm_tty_copy_pending(dev);
742
743 rfcomm_dlc_unthrottle(dev->dlc);
744
745 return err;
746}
747
748static void rfcomm_tty_close(struct tty_struct *tty, struct file *filp)
749{
750 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
751 if (!dev)
752 return;
753
754 BT_DBG("tty %p dev %p dlc %p opened %d", tty, dev, dev->dlc,
755 atomic_read(&dev->opened));
756
757 if (atomic_dec_and_test(&dev->opened)) {
758 if (dev->tty_dev->parent)
759 device_move(dev->tty_dev, NULL, DPM_ORDER_DEV_LAST);
760
761 /* Close DLC and dettach TTY */
762 rfcomm_dlc_close(dev->dlc, 0);
763
764 clear_bit(RFCOMM_TTY_ATTACHED, &dev->flags);
765 tasklet_kill(&dev->wakeup_task);
766
767 rfcomm_dlc_lock(dev->dlc);
768 tty->driver_data = NULL;
769 dev->tty = NULL;
770 rfcomm_dlc_unlock(dev->dlc);
771
772 if (test_bit(RFCOMM_TTY_RELEASED, &dev->flags)) {
773 write_lock_bh(&rfcomm_dev_lock);
774 list_del_init(&dev->list);
775 write_unlock_bh(&rfcomm_dev_lock);
776
777 rfcomm_dev_put(dev);
778 }
779 }
780
781 rfcomm_dev_put(dev);
782}
783
784static int rfcomm_tty_write(struct tty_struct *tty, const unsigned char *buf, int count)
785{
786 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
787 struct rfcomm_dlc *dlc = dev->dlc;
788 struct sk_buff *skb;
789 int err = 0, sent = 0, size;
790
791 BT_DBG("tty %p count %d", tty, count);
792
793 while (count) {
794 size = min_t(uint, count, dlc->mtu);
795
796 skb = rfcomm_wmalloc(dev, size + RFCOMM_SKB_RESERVE, GFP_ATOMIC);
797
798 if (!skb)
799 break;
800
801 skb_reserve(skb, RFCOMM_SKB_HEAD_RESERVE);
802
803 memcpy(skb_put(skb, size), buf + sent, size);
804
805 err = rfcomm_dlc_send(dlc, skb);
806 if (err < 0) {
807 kfree_skb(skb);
808 break;
809 }
810
811 sent += size;
812 count -= size;
813 }
814
815 return sent ? sent : err;
816}
817
818static int rfcomm_tty_write_room(struct tty_struct *tty)
819{
820 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
821 int room;
822
823 BT_DBG("tty %p", tty);
824
825 if (!dev || !dev->dlc)
826 return 0;
827
828 room = rfcomm_room(dev->dlc) - atomic_read(&dev->wmem_alloc);
829 if (room < 0)
830 room = 0;
831
832 return room;
833}
834
835static int rfcomm_tty_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg)
836{
837 BT_DBG("tty %p cmd 0x%02x", tty, cmd);
838
839 switch (cmd) {
840 case TCGETS:
841 BT_DBG("TCGETS is not supported");
842 return -ENOIOCTLCMD;
843
844 case TCSETS:
845 BT_DBG("TCSETS is not supported");
846 return -ENOIOCTLCMD;
847
848 case TIOCMIWAIT:
849 BT_DBG("TIOCMIWAIT");
850 break;
851
852 case TIOCGSERIAL:
853 BT_ERR("TIOCGSERIAL is not supported");
854 return -ENOIOCTLCMD;
855
856 case TIOCSSERIAL:
857 BT_ERR("TIOCSSERIAL is not supported");
858 return -ENOIOCTLCMD;
859
860 case TIOCSERGSTRUCT:
861 BT_ERR("TIOCSERGSTRUCT is not supported");
862 return -ENOIOCTLCMD;
863
864 case TIOCSERGETLSR:
865 BT_ERR("TIOCSERGETLSR is not supported");
866 return -ENOIOCTLCMD;
867
868 case TIOCSERCONFIG:
869 BT_ERR("TIOCSERCONFIG is not supported");
870 return -ENOIOCTLCMD;
871
872 default:
873 return -ENOIOCTLCMD; /* ioctls which we must ignore */
874
875 }
876
877 return -ENOIOCTLCMD;
878}
879
880static void rfcomm_tty_set_termios(struct tty_struct *tty, struct ktermios *old)
881{
882 struct ktermios *new = tty->termios;
883 int old_baud_rate = tty_termios_baud_rate(old);
884 int new_baud_rate = tty_termios_baud_rate(new);
885
886 u8 baud, data_bits, stop_bits, parity, x_on, x_off;
887 u16 changes = 0;
888
889 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
890
891 BT_DBG("tty %p termios %p", tty, old);
892
893 if (!dev || !dev->dlc || !dev->dlc->session)
894 return;
895
896 /* Handle turning off CRTSCTS */
897 if ((old->c_cflag & CRTSCTS) && !(new->c_cflag & CRTSCTS))
898 BT_DBG("Turning off CRTSCTS unsupported");
899
900 /* Parity on/off and when on, odd/even */
901 if (((old->c_cflag & PARENB) != (new->c_cflag & PARENB)) ||
902 ((old->c_cflag & PARODD) != (new->c_cflag & PARODD))) {
903 changes |= RFCOMM_RPN_PM_PARITY;
904 BT_DBG("Parity change detected.");
905 }
906
907 /* Mark and space parity are not supported! */
908 if (new->c_cflag & PARENB) {
909 if (new->c_cflag & PARODD) {
910 BT_DBG("Parity is ODD");
911 parity = RFCOMM_RPN_PARITY_ODD;
912 } else {
913 BT_DBG("Parity is EVEN");
914 parity = RFCOMM_RPN_PARITY_EVEN;
915 }
916 } else {
917 BT_DBG("Parity is OFF");
918 parity = RFCOMM_RPN_PARITY_NONE;
919 }
920
921 /* Setting the x_on / x_off characters */
922 if (old->c_cc[VSTOP] != new->c_cc[VSTOP]) {
923 BT_DBG("XOFF custom");
924 x_on = new->c_cc[VSTOP];
925 changes |= RFCOMM_RPN_PM_XON;
926 } else {
927 BT_DBG("XOFF default");
928 x_on = RFCOMM_RPN_XON_CHAR;
929 }
930
931 if (old->c_cc[VSTART] != new->c_cc[VSTART]) {
932 BT_DBG("XON custom");
933 x_off = new->c_cc[VSTART];
934 changes |= RFCOMM_RPN_PM_XOFF;
935 } else {
936 BT_DBG("XON default");
937 x_off = RFCOMM_RPN_XOFF_CHAR;
938 }
939
940 /* Handle setting of stop bits */
941 if ((old->c_cflag & CSTOPB) != (new->c_cflag & CSTOPB))
942 changes |= RFCOMM_RPN_PM_STOP;
943
944 /* POSIX does not support 1.5 stop bits and RFCOMM does not
945 * support 2 stop bits. So a request for 2 stop bits gets
946 * translated to 1.5 stop bits */
947 if (new->c_cflag & CSTOPB)
948 stop_bits = RFCOMM_RPN_STOP_15;
949 else
950 stop_bits = RFCOMM_RPN_STOP_1;
951
952 /* Handle number of data bits [5-8] */
953 if ((old->c_cflag & CSIZE) != (new->c_cflag & CSIZE))
954 changes |= RFCOMM_RPN_PM_DATA;
955
956 switch (new->c_cflag & CSIZE) {
957 case CS5:
958 data_bits = RFCOMM_RPN_DATA_5;
959 break;
960 case CS6:
961 data_bits = RFCOMM_RPN_DATA_6;
962 break;
963 case CS7:
964 data_bits = RFCOMM_RPN_DATA_7;
965 break;
966 case CS8:
967 data_bits = RFCOMM_RPN_DATA_8;
968 break;
969 default:
970 data_bits = RFCOMM_RPN_DATA_8;
971 break;
972 }
973
974 /* Handle baudrate settings */
975 if (old_baud_rate != new_baud_rate)
976 changes |= RFCOMM_RPN_PM_BITRATE;
977
978 switch (new_baud_rate) {
979 case 2400:
980 baud = RFCOMM_RPN_BR_2400;
981 break;
982 case 4800:
983 baud = RFCOMM_RPN_BR_4800;
984 break;
985 case 7200:
986 baud = RFCOMM_RPN_BR_7200;
987 break;
988 case 9600:
989 baud = RFCOMM_RPN_BR_9600;
990 break;
991 case 19200:
992 baud = RFCOMM_RPN_BR_19200;
993 break;
994 case 38400:
995 baud = RFCOMM_RPN_BR_38400;
996 break;
997 case 57600:
998 baud = RFCOMM_RPN_BR_57600;
999 break;
1000 case 115200:
1001 baud = RFCOMM_RPN_BR_115200;
1002 break;
1003 case 230400:
1004 baud = RFCOMM_RPN_BR_230400;
1005 break;
1006 default:
1007 /* 9600 is standard accordinag to the RFCOMM specification */
1008 baud = RFCOMM_RPN_BR_9600;
1009 break;
1010
1011 }
1012
1013 if (changes)
1014 rfcomm_send_rpn(dev->dlc->session, 1, dev->dlc->dlci, baud,
1015 data_bits, stop_bits, parity,
1016 RFCOMM_RPN_FLOW_NONE, x_on, x_off, changes);
1017}
1018
1019static void rfcomm_tty_throttle(struct tty_struct *tty)
1020{
1021 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
1022
1023 BT_DBG("tty %p dev %p", tty, dev);
1024
1025 rfcomm_dlc_throttle(dev->dlc);
1026}
1027
1028static void rfcomm_tty_unthrottle(struct tty_struct *tty)
1029{
1030 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
1031
1032 BT_DBG("tty %p dev %p", tty, dev);
1033
1034 rfcomm_dlc_unthrottle(dev->dlc);
1035}
1036
1037static int rfcomm_tty_chars_in_buffer(struct tty_struct *tty)
1038{
1039 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
1040
1041 BT_DBG("tty %p dev %p", tty, dev);
1042
1043 if (!dev || !dev->dlc)
1044 return 0;
1045
1046 if (!skb_queue_empty(&dev->dlc->tx_queue))
1047 return dev->dlc->mtu;
1048
1049 return 0;
1050}
1051
1052static void rfcomm_tty_flush_buffer(struct tty_struct *tty)
1053{
1054 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
1055
1056 BT_DBG("tty %p dev %p", tty, dev);
1057
1058 if (!dev || !dev->dlc)
1059 return;
1060
1061 skb_queue_purge(&dev->dlc->tx_queue);
1062 tty_wakeup(tty);
1063}
1064
1065static void rfcomm_tty_send_xchar(struct tty_struct *tty, char ch)
1066{
1067 BT_DBG("tty %p ch %c", tty, ch);
1068}
1069
1070static void rfcomm_tty_wait_until_sent(struct tty_struct *tty, int timeout)
1071{
1072 BT_DBG("tty %p timeout %d", tty, timeout);
1073}
1074
1075static void rfcomm_tty_hangup(struct tty_struct *tty)
1076{
1077 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
1078
1079 BT_DBG("tty %p dev %p", tty, dev);
1080
1081 if (!dev)
1082 return;
1083
1084 rfcomm_tty_flush_buffer(tty);
1085
1086 if (test_bit(RFCOMM_RELEASE_ONHUP, &dev->flags)) {
1087 if (rfcomm_dev_get(dev->id) == NULL)
1088 return;
1089 rfcomm_dev_del(dev);
1090 rfcomm_dev_put(dev);
1091 }
1092}
1093
1094static int rfcomm_tty_tiocmget(struct tty_struct *tty)
1095{
1096 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
1097
1098 BT_DBG("tty %p dev %p", tty, dev);
1099
1100 return dev->modem_status;
1101}
1102
1103static int rfcomm_tty_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear)
1104{
1105 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
1106 struct rfcomm_dlc *dlc = dev->dlc;
1107 u8 v24_sig;
1108
1109 BT_DBG("tty %p dev %p set 0x%02x clear 0x%02x", tty, dev, set, clear);
1110
1111 rfcomm_dlc_get_modem_status(dlc, &v24_sig);
1112
1113 if (set & TIOCM_DSR || set & TIOCM_DTR)
1114 v24_sig |= RFCOMM_V24_RTC;
1115 if (set & TIOCM_RTS || set & TIOCM_CTS)
1116 v24_sig |= RFCOMM_V24_RTR;
1117 if (set & TIOCM_RI)
1118 v24_sig |= RFCOMM_V24_IC;
1119 if (set & TIOCM_CD)
1120 v24_sig |= RFCOMM_V24_DV;
1121
1122 if (clear & TIOCM_DSR || clear & TIOCM_DTR)
1123 v24_sig &= ~RFCOMM_V24_RTC;
1124 if (clear & TIOCM_RTS || clear & TIOCM_CTS)
1125 v24_sig &= ~RFCOMM_V24_RTR;
1126 if (clear & TIOCM_RI)
1127 v24_sig &= ~RFCOMM_V24_IC;
1128 if (clear & TIOCM_CD)
1129 v24_sig &= ~RFCOMM_V24_DV;
1130
1131 rfcomm_dlc_set_modem_status(dlc, v24_sig);
1132
1133 return 0;
1134}
1135
1136/* ---- TTY structure ---- */
1137
1138static const struct tty_operations rfcomm_ops = {
1139 .open = rfcomm_tty_open,
1140 .close = rfcomm_tty_close,
1141 .write = rfcomm_tty_write,
1142 .write_room = rfcomm_tty_write_room,
1143 .chars_in_buffer = rfcomm_tty_chars_in_buffer,
1144 .flush_buffer = rfcomm_tty_flush_buffer,
1145 .ioctl = rfcomm_tty_ioctl,
1146 .throttle = rfcomm_tty_throttle,
1147 .unthrottle = rfcomm_tty_unthrottle,
1148 .set_termios = rfcomm_tty_set_termios,
1149 .send_xchar = rfcomm_tty_send_xchar,
1150 .hangup = rfcomm_tty_hangup,
1151 .wait_until_sent = rfcomm_tty_wait_until_sent,
1152 .tiocmget = rfcomm_tty_tiocmget,
1153 .tiocmset = rfcomm_tty_tiocmset,
1154};
1155
1156int __init rfcomm_init_ttys(void)
1157{
1158 rfcomm_tty_driver = alloc_tty_driver(RFCOMM_TTY_PORTS);
1159 if (!rfcomm_tty_driver)
1160 return -1;
1161
1162 rfcomm_tty_driver->owner = THIS_MODULE;
1163 rfcomm_tty_driver->driver_name = "rfcomm";
1164 rfcomm_tty_driver->name = "rfcomm";
1165 rfcomm_tty_driver->major = RFCOMM_TTY_MAJOR;
1166 rfcomm_tty_driver->minor_start = RFCOMM_TTY_MINOR;
1167 rfcomm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
1168 rfcomm_tty_driver->subtype = SERIAL_TYPE_NORMAL;
1169 rfcomm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1170 rfcomm_tty_driver->init_termios = tty_std_termios;
1171 rfcomm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1172 rfcomm_tty_driver->init_termios.c_lflag &= ~ICANON;
1173 tty_set_operations(rfcomm_tty_driver, &rfcomm_ops);
1174
1175 if (tty_register_driver(rfcomm_tty_driver)) {
1176 BT_ERR("Can't register RFCOMM TTY driver");
1177 put_tty_driver(rfcomm_tty_driver);
1178 return -1;
1179 }
1180
1181 BT_INFO("RFCOMM TTY layer initialized");
1182
1183 return 0;
1184}
1185
1186void rfcomm_cleanup_ttys(void)
1187{
1188 tty_unregister_driver(rfcomm_tty_driver);
1189 put_tty_driver(rfcomm_tty_driver);
1190}