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a6a758dd1f7d88dc322fb565494b2db42d181b69
[deliverable/linux.git] / net / bluetooth / rfcomm / tty.c
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/module.h>
31
32 #include <linux/tty.h>
33 #include <linux/tty_driver.h>
34 #include <linux/tty_flip.h>
35
36 #include <linux/capability.h>
37 #include <linux/slab.h>
38 #include <linux/skbuff.h>
39
40 #include <net/bluetooth/bluetooth.h>
41 #include <net/bluetooth/hci_core.h>
42 #include <net/bluetooth/rfcomm.h>
43
44 #ifndef CONFIG_BT_RFCOMM_DEBUG
45 #undef BT_DBG
46 #define BT_DBG(D...)
47 #endif
48
49 #define RFCOMM_TTY_MAGIC 0x6d02 /* magic number for rfcomm struct */
50 #define RFCOMM_TTY_PORTS RFCOMM_MAX_DEV /* whole lotta rfcomm devices */
51 #define RFCOMM_TTY_MAJOR 216 /* device node major id of the usb/bluetooth.c driver */
52 #define RFCOMM_TTY_MINOR 0
53
54 static struct tty_driver *rfcomm_tty_driver;
55
56 struct rfcomm_dev {
57 struct list_head list;
58 atomic_t refcnt;
59
60 char name[12];
61 int id;
62 unsigned long flags;
63 int opened;
64 int err;
65
66 bdaddr_t src;
67 bdaddr_t dst;
68 u8 channel;
69
70 uint modem_status;
71
72 struct rfcomm_dlc *dlc;
73 struct tty_struct *tty;
74 wait_queue_head_t wait;
75 struct tasklet_struct wakeup_task;
76
77 struct device *tty_dev;
78
79 atomic_t wmem_alloc;
80 };
81
82 static LIST_HEAD(rfcomm_dev_list);
83 static DEFINE_RWLOCK(rfcomm_dev_lock);
84
85 static void rfcomm_dev_data_ready(struct rfcomm_dlc *dlc, struct sk_buff *skb);
86 static void rfcomm_dev_state_change(struct rfcomm_dlc *dlc, int err);
87 static void rfcomm_dev_modem_status(struct rfcomm_dlc *dlc, u8 v24_sig);
88
89 static void rfcomm_tty_wakeup(unsigned long arg);
90
91 /* ---- Device functions ---- */
92 static void rfcomm_dev_destruct(struct rfcomm_dev *dev)
93 {
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
120 static inline void rfcomm_dev_hold(struct rfcomm_dev *dev)
121 {
122 atomic_inc(&dev->refcnt);
123 }
124
125 static inline void rfcomm_dev_put(struct rfcomm_dev *dev)
126 {
127 /* The reason this isn't actually a race, as you no
128 doubt have a little voice screaming at you in your
129 head, is that the refcount should never actually
130 reach zero unless the device has already been taken
131 off the list, in rfcomm_dev_del(). And if that's not
132 true, we'll hit the BUG() in rfcomm_dev_destruct()
133 anyway. */
134 if (atomic_dec_and_test(&dev->refcnt))
135 rfcomm_dev_destruct(dev);
136 }
137
138 static struct rfcomm_dev *__rfcomm_dev_get(int id)
139 {
140 struct rfcomm_dev *dev;
141 struct list_head *p;
142
143 list_for_each(p, &rfcomm_dev_list) {
144 dev = list_entry(p, struct rfcomm_dev, list);
145 if (dev->id == id)
146 return dev;
147 }
148
149 return NULL;
150 }
151
152 static inline struct rfcomm_dev *rfcomm_dev_get(int id)
153 {
154 struct rfcomm_dev *dev;
155
156 read_lock(&rfcomm_dev_lock);
157
158 dev = __rfcomm_dev_get(id);
159
160 if (dev) {
161 if (test_bit(RFCOMM_TTY_RELEASED, &dev->flags))
162 dev = NULL;
163 else
164 rfcomm_dev_hold(dev);
165 }
166
167 read_unlock(&rfcomm_dev_lock);
168
169 return dev;
170 }
171
172 static struct device *rfcomm_get_device(struct rfcomm_dev *dev)
173 {
174 struct hci_dev *hdev;
175 struct hci_conn *conn;
176
177 hdev = hci_get_route(&dev->dst, &dev->src);
178 if (!hdev)
179 return NULL;
180
181 conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &dev->dst);
182
183 hci_dev_put(hdev);
184
185 return conn ? &conn->dev : NULL;
186 }
187
188 static ssize_t show_address(struct device *tty_dev, struct device_attribute *attr, char *buf)
189 {
190 struct rfcomm_dev *dev = dev_get_drvdata(tty_dev);
191 bdaddr_t bdaddr;
192 baswap(&bdaddr, &dev->dst);
193 return sprintf(buf, "%s\n", batostr(&bdaddr));
194 }
195
196 static ssize_t show_channel(struct device *tty_dev, struct device_attribute *attr, char *buf)
197 {
198 struct rfcomm_dev *dev = dev_get_drvdata(tty_dev);
199 return sprintf(buf, "%d\n", dev->channel);
200 }
201
202 static DEVICE_ATTR(address, S_IRUGO, show_address, NULL);
203 static DEVICE_ATTR(channel, S_IRUGO, show_channel, NULL);
204
205 static int rfcomm_dev_add(struct rfcomm_dev_req *req, struct rfcomm_dlc *dlc)
206 {
207 struct rfcomm_dev *dev;
208 struct list_head *head = &rfcomm_dev_list, *p;
209 int err = 0;
210
211 BT_DBG("id %d channel %d", req->dev_id, req->channel);
212
213 dev = kzalloc(sizeof(struct rfcomm_dev), GFP_KERNEL);
214 if (!dev)
215 return -ENOMEM;
216
217 write_lock_bh(&rfcomm_dev_lock);
218
219 if (req->dev_id < 0) {
220 dev->id = 0;
221
222 list_for_each(p, &rfcomm_dev_list) {
223 if (list_entry(p, struct rfcomm_dev, list)->id != dev->id)
224 break;
225
226 dev->id++;
227 head = p;
228 }
229 } else {
230 dev->id = req->dev_id;
231
232 list_for_each(p, &rfcomm_dev_list) {
233 struct rfcomm_dev *entry = list_entry(p, struct rfcomm_dev, list);
234
235 if (entry->id == dev->id) {
236 err = -EADDRINUSE;
237 goto out;
238 }
239
240 if (entry->id > dev->id - 1)
241 break;
242
243 head = p;
244 }
245 }
246
247 if ((dev->id < 0) || (dev->id > RFCOMM_MAX_DEV - 1)) {
248 err = -ENFILE;
249 goto out;
250 }
251
252 sprintf(dev->name, "rfcomm%d", dev->id);
253
254 list_add(&dev->list, head);
255 atomic_set(&dev->refcnt, 1);
256
257 bacpy(&dev->src, &req->src);
258 bacpy(&dev->dst, &req->dst);
259 dev->channel = req->channel;
260
261 dev->flags = req->flags &
262 ((1 << RFCOMM_RELEASE_ONHUP) | (1 << RFCOMM_REUSE_DLC));
263
264 init_waitqueue_head(&dev->wait);
265 tasklet_init(&dev->wakeup_task, rfcomm_tty_wakeup, (unsigned long) dev);
266
267 rfcomm_dlc_lock(dlc);
268 dlc->data_ready = rfcomm_dev_data_ready;
269 dlc->state_change = rfcomm_dev_state_change;
270 dlc->modem_status = rfcomm_dev_modem_status;
271
272 dlc->owner = dev;
273 dev->dlc = dlc;
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
280 out:
281 write_unlock_bh(&rfcomm_dev_lock);
282
283 if (err < 0) {
284 kfree(dev);
285 return err;
286 }
287
288 dev->tty_dev = tty_register_device(rfcomm_tty_driver, dev->id, NULL);
289
290 if (IS_ERR(dev->tty_dev)) {
291 err = PTR_ERR(dev->tty_dev);
292 list_del(&dev->list);
293 kfree(dev);
294 return err;
295 }
296
297 dev_set_drvdata(dev->tty_dev, dev);
298
299 if (device_create_file(dev->tty_dev, &dev_attr_address) < 0)
300 BT_ERR("Failed to create address attribute");
301
302 if (device_create_file(dev->tty_dev, &dev_attr_channel) < 0)
303 BT_ERR("Failed to create channel attribute");
304
305 return dev->id;
306 }
307
308 static void rfcomm_dev_del(struct rfcomm_dev *dev)
309 {
310 BT_DBG("dev %p", dev);
311
312 if (test_bit(RFCOMM_TTY_RELEASED, &dev->flags))
313 BUG_ON(1);
314 else
315 set_bit(RFCOMM_TTY_RELEASED, &dev->flags);
316
317 write_lock_bh(&rfcomm_dev_lock);
318 list_del_init(&dev->list);
319 write_unlock_bh(&rfcomm_dev_lock);
320
321 rfcomm_dev_put(dev);
322 }
323
324 /* ---- Send buffer ---- */
325 static inline unsigned int rfcomm_room(struct rfcomm_dlc *dlc)
326 {
327 /* We can't let it be zero, because we don't get a callback
328 when tx_credits becomes nonzero, hence we'd never wake up */
329 return dlc->mtu * (dlc->tx_credits?:1);
330 }
331
332 static void rfcomm_wfree(struct sk_buff *skb)
333 {
334 struct rfcomm_dev *dev = (void *) skb->sk;
335 atomic_sub(skb->truesize, &dev->wmem_alloc);
336 if (test_bit(RFCOMM_TTY_ATTACHED, &dev->flags))
337 tasklet_schedule(&dev->wakeup_task);
338 rfcomm_dev_put(dev);
339 }
340
341 static inline void rfcomm_set_owner_w(struct sk_buff *skb, struct rfcomm_dev *dev)
342 {
343 rfcomm_dev_hold(dev);
344 atomic_add(skb->truesize, &dev->wmem_alloc);
345 skb->sk = (void *) dev;
346 skb->destructor = rfcomm_wfree;
347 }
348
349 static struct sk_buff *rfcomm_wmalloc(struct rfcomm_dev *dev, unsigned long size, gfp_t priority)
350 {
351 if (atomic_read(&dev->wmem_alloc) < rfcomm_room(dev->dlc)) {
352 struct sk_buff *skb = alloc_skb(size, priority);
353 if (skb) {
354 rfcomm_set_owner_w(skb, dev);
355 return skb;
356 }
357 }
358 return NULL;
359 }
360
361 /* ---- Device IOCTLs ---- */
362
363 #define NOCAP_FLAGS ((1 << RFCOMM_REUSE_DLC) | (1 << RFCOMM_RELEASE_ONHUP))
364
365 static int rfcomm_create_dev(struct sock *sk, void __user *arg)
366 {
367 struct rfcomm_dev_req req;
368 struct rfcomm_dlc *dlc;
369 int id;
370
371 if (copy_from_user(&req, arg, sizeof(req)))
372 return -EFAULT;
373
374 BT_DBG("sk %p dev_id %d flags 0x%x", sk, req.dev_id, req.flags);
375
376 if (req.flags != NOCAP_FLAGS && !capable(CAP_NET_ADMIN))
377 return -EPERM;
378
379 if (req.flags & (1 << RFCOMM_REUSE_DLC)) {
380 /* Socket must be connected */
381 if (sk->sk_state != BT_CONNECTED)
382 return -EBADFD;
383
384 dlc = rfcomm_pi(sk)->dlc;
385 rfcomm_dlc_hold(dlc);
386 } else {
387 dlc = rfcomm_dlc_alloc(GFP_KERNEL);
388 if (!dlc)
389 return -ENOMEM;
390 }
391
392 id = rfcomm_dev_add(&req, dlc);
393 if (id < 0) {
394 rfcomm_dlc_put(dlc);
395 return id;
396 }
397
398 if (req.flags & (1 << RFCOMM_REUSE_DLC)) {
399 /* DLC is now used by device.
400 * Socket must be disconnected */
401 sk->sk_state = BT_CLOSED;
402 }
403
404 return id;
405 }
406
407 static int rfcomm_release_dev(void __user *arg)
408 {
409 struct rfcomm_dev_req req;
410 struct rfcomm_dev *dev;
411
412 if (copy_from_user(&req, arg, sizeof(req)))
413 return -EFAULT;
414
415 BT_DBG("dev_id %d flags 0x%x", req.dev_id, req.flags);
416
417 if (!(dev = rfcomm_dev_get(req.dev_id)))
418 return -ENODEV;
419
420 if (dev->flags != NOCAP_FLAGS && !capable(CAP_NET_ADMIN)) {
421 rfcomm_dev_put(dev);
422 return -EPERM;
423 }
424
425 if (req.flags & (1 << RFCOMM_HANGUP_NOW))
426 rfcomm_dlc_close(dev->dlc, 0);
427
428 /* Shut down TTY synchronously before freeing rfcomm_dev */
429 if (dev->tty)
430 tty_vhangup(dev->tty);
431
432 rfcomm_dev_del(dev);
433 rfcomm_dev_put(dev);
434 return 0;
435 }
436
437 static int rfcomm_get_dev_list(void __user *arg)
438 {
439 struct rfcomm_dev_list_req *dl;
440 struct rfcomm_dev_info *di;
441 struct list_head *p;
442 int n = 0, size, err;
443 u16 dev_num;
444
445 BT_DBG("");
446
447 if (get_user(dev_num, (u16 __user *) arg))
448 return -EFAULT;
449
450 if (!dev_num || dev_num > (PAGE_SIZE * 4) / sizeof(*di))
451 return -EINVAL;
452
453 size = sizeof(*dl) + dev_num * sizeof(*di);
454
455 if (!(dl = kmalloc(size, GFP_KERNEL)))
456 return -ENOMEM;
457
458 di = dl->dev_info;
459
460 read_lock_bh(&rfcomm_dev_lock);
461
462 list_for_each(p, &rfcomm_dev_list) {
463 struct rfcomm_dev *dev = list_entry(p, struct rfcomm_dev, list);
464 if (test_bit(RFCOMM_TTY_RELEASED, &dev->flags))
465 continue;
466 (di + n)->id = dev->id;
467 (di + n)->flags = dev->flags;
468 (di + n)->state = dev->dlc->state;
469 (di + n)->channel = dev->channel;
470 bacpy(&(di + n)->src, &dev->src);
471 bacpy(&(di + n)->dst, &dev->dst);
472 if (++n >= dev_num)
473 break;
474 }
475
476 read_unlock_bh(&rfcomm_dev_lock);
477
478 dl->dev_num = n;
479 size = sizeof(*dl) + n * sizeof(*di);
480
481 err = copy_to_user(arg, dl, size);
482 kfree(dl);
483
484 return err ? -EFAULT : 0;
485 }
486
487 static int rfcomm_get_dev_info(void __user *arg)
488 {
489 struct rfcomm_dev *dev;
490 struct rfcomm_dev_info di;
491 int err = 0;
492
493 BT_DBG("");
494
495 if (copy_from_user(&di, arg, sizeof(di)))
496 return -EFAULT;
497
498 if (!(dev = rfcomm_dev_get(di.id)))
499 return -ENODEV;
500
501 di.flags = dev->flags;
502 di.channel = dev->channel;
503 di.state = dev->dlc->state;
504 bacpy(&di.src, &dev->src);
505 bacpy(&di.dst, &dev->dst);
506
507 if (copy_to_user(arg, &di, sizeof(di)))
508 err = -EFAULT;
509
510 rfcomm_dev_put(dev);
511 return err;
512 }
513
514 int rfcomm_dev_ioctl(struct sock *sk, unsigned int cmd, void __user *arg)
515 {
516 BT_DBG("cmd %d arg %p", cmd, arg);
517
518 switch (cmd) {
519 case RFCOMMCREATEDEV:
520 return rfcomm_create_dev(sk, arg);
521
522 case RFCOMMRELEASEDEV:
523 return rfcomm_release_dev(arg);
524
525 case RFCOMMGETDEVLIST:
526 return rfcomm_get_dev_list(arg);
527
528 case RFCOMMGETDEVINFO:
529 return rfcomm_get_dev_info(arg);
530 }
531
532 return -EINVAL;
533 }
534
535 /* ---- DLC callbacks ---- */
536 static void rfcomm_dev_data_ready(struct rfcomm_dlc *dlc, struct sk_buff *skb)
537 {
538 struct rfcomm_dev *dev = dlc->owner;
539 struct tty_struct *tty;
540
541 if (!dev || !(tty = dev->tty)) {
542 kfree_skb(skb);
543 return;
544 }
545
546 BT_DBG("dlc %p tty %p len %d", dlc, tty, skb->len);
547
548 tty_insert_flip_string(tty, skb->data, skb->len);
549 tty_flip_buffer_push(tty);
550
551 kfree_skb(skb);
552 }
553
554 static void rfcomm_dev_state_change(struct rfcomm_dlc *dlc, int err)
555 {
556 struct rfcomm_dev *dev = dlc->owner;
557 if (!dev)
558 return;
559
560 BT_DBG("dlc %p dev %p err %d", dlc, dev, err);
561
562 dev->err = err;
563 wake_up_interruptible(&dev->wait);
564
565 if (dlc->state == BT_CLOSED) {
566 if (!dev->tty) {
567 if (test_bit(RFCOMM_RELEASE_ONHUP, &dev->flags)) {
568 if (rfcomm_dev_get(dev->id) == NULL)
569 return;
570
571 rfcomm_dev_del(dev);
572 /* We have to drop DLC lock here, otherwise
573 rfcomm_dev_put() will dead lock if it's
574 the last reference. */
575 rfcomm_dlc_unlock(dlc);
576 rfcomm_dev_put(dev);
577 rfcomm_dlc_lock(dlc);
578 }
579 } else
580 tty_hangup(dev->tty);
581 }
582 }
583
584 static void rfcomm_dev_modem_status(struct rfcomm_dlc *dlc, u8 v24_sig)
585 {
586 struct rfcomm_dev *dev = dlc->owner;
587 if (!dev)
588 return;
589
590 BT_DBG("dlc %p dev %p v24_sig 0x%02x", dlc, dev, v24_sig);
591
592 if ((dev->modem_status & TIOCM_CD) && !(v24_sig & RFCOMM_V24_DV)) {
593 if (dev->tty && !C_CLOCAL(dev->tty))
594 tty_hangup(dev->tty);
595 }
596
597 dev->modem_status =
598 ((v24_sig & RFCOMM_V24_RTC) ? (TIOCM_DSR | TIOCM_DTR) : 0) |
599 ((v24_sig & RFCOMM_V24_RTR) ? (TIOCM_RTS | TIOCM_CTS) : 0) |
600 ((v24_sig & RFCOMM_V24_IC) ? TIOCM_RI : 0) |
601 ((v24_sig & RFCOMM_V24_DV) ? TIOCM_CD : 0);
602 }
603
604 /* ---- TTY functions ---- */
605 static void rfcomm_tty_wakeup(unsigned long arg)
606 {
607 struct rfcomm_dev *dev = (void *) arg;
608 struct tty_struct *tty = dev->tty;
609 if (!tty)
610 return;
611
612 BT_DBG("dev %p tty %p", dev, tty);
613
614 if (test_bit(TTY_DO_WRITE_WAKEUP, &tty->flags) && tty->ldisc.write_wakeup)
615 (tty->ldisc.write_wakeup)(tty);
616
617 wake_up_interruptible(&tty->write_wait);
618 #ifdef SERIAL_HAVE_POLL_WAIT
619 wake_up_interruptible(&tty->poll_wait);
620 #endif
621 }
622
623 static int rfcomm_tty_open(struct tty_struct *tty, struct file *filp)
624 {
625 DECLARE_WAITQUEUE(wait, current);
626 struct rfcomm_dev *dev;
627 struct rfcomm_dlc *dlc;
628 int err, id;
629
630 id = tty->index;
631
632 BT_DBG("tty %p id %d", tty, id);
633
634 /* We don't leak this refcount. For reasons which are not entirely
635 clear, the TTY layer will call our ->close() method even if the
636 open fails. We decrease the refcount there, and decreasing it
637 here too would cause breakage. */
638 dev = rfcomm_dev_get(id);
639 if (!dev)
640 return -ENODEV;
641
642 BT_DBG("dev %p dst %s channel %d opened %d", dev, batostr(&dev->dst), dev->channel, dev->opened);
643
644 if (dev->opened++ != 0)
645 return 0;
646
647 dlc = dev->dlc;
648
649 /* Attach TTY and open DLC */
650
651 rfcomm_dlc_lock(dlc);
652 tty->driver_data = dev;
653 dev->tty = tty;
654 rfcomm_dlc_unlock(dlc);
655 set_bit(RFCOMM_TTY_ATTACHED, &dev->flags);
656
657 err = rfcomm_dlc_open(dlc, &dev->src, &dev->dst, dev->channel);
658 if (err < 0)
659 return err;
660
661 /* Wait for DLC to connect */
662 add_wait_queue(&dev->wait, &wait);
663 while (1) {
664 set_current_state(TASK_INTERRUPTIBLE);
665
666 if (dlc->state == BT_CLOSED) {
667 err = -dev->err;
668 break;
669 }
670
671 if (dlc->state == BT_CONNECTED)
672 break;
673
674 if (signal_pending(current)) {
675 err = -EINTR;
676 break;
677 }
678
679 schedule();
680 }
681 set_current_state(TASK_RUNNING);
682 remove_wait_queue(&dev->wait, &wait);
683
684 if (err == 0)
685 device_move(dev->tty_dev, rfcomm_get_device(dev));
686
687 return err;
688 }
689
690 static void rfcomm_tty_close(struct tty_struct *tty, struct file *filp)
691 {
692 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
693 if (!dev)
694 return;
695
696 BT_DBG("tty %p dev %p dlc %p opened %d", tty, dev, dev->dlc, dev->opened);
697
698 if (--dev->opened == 0) {
699 device_move(dev->tty_dev, NULL);
700
701 /* Close DLC and dettach TTY */
702 rfcomm_dlc_close(dev->dlc, 0);
703
704 clear_bit(RFCOMM_TTY_ATTACHED, &dev->flags);
705 tasklet_kill(&dev->wakeup_task);
706
707 rfcomm_dlc_lock(dev->dlc);
708 tty->driver_data = NULL;
709 dev->tty = NULL;
710 rfcomm_dlc_unlock(dev->dlc);
711 }
712
713 rfcomm_dev_put(dev);
714 }
715
716 static int rfcomm_tty_write(struct tty_struct *tty, const unsigned char *buf, int count)
717 {
718 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
719 struct rfcomm_dlc *dlc = dev->dlc;
720 struct sk_buff *skb;
721 int err = 0, sent = 0, size;
722
723 BT_DBG("tty %p count %d", tty, count);
724
725 while (count) {
726 size = min_t(uint, count, dlc->mtu);
727
728 skb = rfcomm_wmalloc(dev, size + RFCOMM_SKB_RESERVE, GFP_ATOMIC);
729
730 if (!skb)
731 break;
732
733 skb_reserve(skb, RFCOMM_SKB_HEAD_RESERVE);
734
735 memcpy(skb_put(skb, size), buf + sent, size);
736
737 if ((err = rfcomm_dlc_send(dlc, skb)) < 0) {
738 kfree_skb(skb);
739 break;
740 }
741
742 sent += size;
743 count -= size;
744 }
745
746 return sent ? sent : err;
747 }
748
749 static int rfcomm_tty_write_room(struct tty_struct *tty)
750 {
751 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
752 int room;
753
754 BT_DBG("tty %p", tty);
755
756 if (!dev || !dev->dlc)
757 return 0;
758
759 room = rfcomm_room(dev->dlc) - atomic_read(&dev->wmem_alloc);
760 if (room < 0)
761 room = 0;
762
763 return room;
764 }
765
766 static int rfcomm_tty_ioctl(struct tty_struct *tty, struct file *filp, unsigned int cmd, unsigned long arg)
767 {
768 BT_DBG("tty %p cmd 0x%02x", tty, cmd);
769
770 switch (cmd) {
771 case TCGETS:
772 BT_DBG("TCGETS is not supported");
773 return -ENOIOCTLCMD;
774
775 case TCSETS:
776 BT_DBG("TCSETS is not supported");
777 return -ENOIOCTLCMD;
778
779 case TIOCMIWAIT:
780 BT_DBG("TIOCMIWAIT");
781 break;
782
783 case TIOCGICOUNT:
784 BT_DBG("TIOCGICOUNT");
785 break;
786
787 case TIOCGSERIAL:
788 BT_ERR("TIOCGSERIAL is not supported");
789 return -ENOIOCTLCMD;
790
791 case TIOCSSERIAL:
792 BT_ERR("TIOCSSERIAL is not supported");
793 return -ENOIOCTLCMD;
794
795 case TIOCSERGSTRUCT:
796 BT_ERR("TIOCSERGSTRUCT is not supported");
797 return -ENOIOCTLCMD;
798
799 case TIOCSERGETLSR:
800 BT_ERR("TIOCSERGETLSR is not supported");
801 return -ENOIOCTLCMD;
802
803 case TIOCSERCONFIG:
804 BT_ERR("TIOCSERCONFIG is not supported");
805 return -ENOIOCTLCMD;
806
807 default:
808 return -ENOIOCTLCMD; /* ioctls which we must ignore */
809
810 }
811
812 return -ENOIOCTLCMD;
813 }
814
815 static void rfcomm_tty_set_termios(struct tty_struct *tty, struct ktermios *old)
816 {
817 struct ktermios *new = tty->termios;
818 int old_baud_rate = tty_termios_baud_rate(old);
819 int new_baud_rate = tty_termios_baud_rate(new);
820
821 u8 baud, data_bits, stop_bits, parity, x_on, x_off;
822 u16 changes = 0;
823
824 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
825
826 BT_DBG("tty %p termios %p", tty, old);
827
828 if (!dev || !dev->dlc || !dev->dlc->session)
829 return;
830
831 /* Handle turning off CRTSCTS */
832 if ((old->c_cflag & CRTSCTS) && !(new->c_cflag & CRTSCTS))
833 BT_DBG("Turning off CRTSCTS unsupported");
834
835 /* Parity on/off and when on, odd/even */
836 if (((old->c_cflag & PARENB) != (new->c_cflag & PARENB)) ||
837 ((old->c_cflag & PARODD) != (new->c_cflag & PARODD)) ) {
838 changes |= RFCOMM_RPN_PM_PARITY;
839 BT_DBG("Parity change detected.");
840 }
841
842 /* Mark and space parity are not supported! */
843 if (new->c_cflag & PARENB) {
844 if (new->c_cflag & PARODD) {
845 BT_DBG("Parity is ODD");
846 parity = RFCOMM_RPN_PARITY_ODD;
847 } else {
848 BT_DBG("Parity is EVEN");
849 parity = RFCOMM_RPN_PARITY_EVEN;
850 }
851 } else {
852 BT_DBG("Parity is OFF");
853 parity = RFCOMM_RPN_PARITY_NONE;
854 }
855
856 /* Setting the x_on / x_off characters */
857 if (old->c_cc[VSTOP] != new->c_cc[VSTOP]) {
858 BT_DBG("XOFF custom");
859 x_on = new->c_cc[VSTOP];
860 changes |= RFCOMM_RPN_PM_XON;
861 } else {
862 BT_DBG("XOFF default");
863 x_on = RFCOMM_RPN_XON_CHAR;
864 }
865
866 if (old->c_cc[VSTART] != new->c_cc[VSTART]) {
867 BT_DBG("XON custom");
868 x_off = new->c_cc[VSTART];
869 changes |= RFCOMM_RPN_PM_XOFF;
870 } else {
871 BT_DBG("XON default");
872 x_off = RFCOMM_RPN_XOFF_CHAR;
873 }
874
875 /* Handle setting of stop bits */
876 if ((old->c_cflag & CSTOPB) != (new->c_cflag & CSTOPB))
877 changes |= RFCOMM_RPN_PM_STOP;
878
879 /* POSIX does not support 1.5 stop bits and RFCOMM does not
880 * support 2 stop bits. So a request for 2 stop bits gets
881 * translated to 1.5 stop bits */
882 if (new->c_cflag & CSTOPB) {
883 stop_bits = RFCOMM_RPN_STOP_15;
884 } else {
885 stop_bits = RFCOMM_RPN_STOP_1;
886 }
887
888 /* Handle number of data bits [5-8] */
889 if ((old->c_cflag & CSIZE) != (new->c_cflag & CSIZE))
890 changes |= RFCOMM_RPN_PM_DATA;
891
892 switch (new->c_cflag & CSIZE) {
893 case CS5:
894 data_bits = RFCOMM_RPN_DATA_5;
895 break;
896 case CS6:
897 data_bits = RFCOMM_RPN_DATA_6;
898 break;
899 case CS7:
900 data_bits = RFCOMM_RPN_DATA_7;
901 break;
902 case CS8:
903 data_bits = RFCOMM_RPN_DATA_8;
904 break;
905 default:
906 data_bits = RFCOMM_RPN_DATA_8;
907 break;
908 }
909
910 /* Handle baudrate settings */
911 if (old_baud_rate != new_baud_rate)
912 changes |= RFCOMM_RPN_PM_BITRATE;
913
914 switch (new_baud_rate) {
915 case 2400:
916 baud = RFCOMM_RPN_BR_2400;
917 break;
918 case 4800:
919 baud = RFCOMM_RPN_BR_4800;
920 break;
921 case 7200:
922 baud = RFCOMM_RPN_BR_7200;
923 break;
924 case 9600:
925 baud = RFCOMM_RPN_BR_9600;
926 break;
927 case 19200:
928 baud = RFCOMM_RPN_BR_19200;
929 break;
930 case 38400:
931 baud = RFCOMM_RPN_BR_38400;
932 break;
933 case 57600:
934 baud = RFCOMM_RPN_BR_57600;
935 break;
936 case 115200:
937 baud = RFCOMM_RPN_BR_115200;
938 break;
939 case 230400:
940 baud = RFCOMM_RPN_BR_230400;
941 break;
942 default:
943 /* 9600 is standard accordinag to the RFCOMM specification */
944 baud = RFCOMM_RPN_BR_9600;
945 break;
946
947 }
948
949 if (changes)
950 rfcomm_send_rpn(dev->dlc->session, 1, dev->dlc->dlci, baud,
951 data_bits, stop_bits, parity,
952 RFCOMM_RPN_FLOW_NONE, x_on, x_off, changes);
953
954 return;
955 }
956
957 static void rfcomm_tty_throttle(struct tty_struct *tty)
958 {
959 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
960
961 BT_DBG("tty %p dev %p", tty, dev);
962
963 rfcomm_dlc_throttle(dev->dlc);
964 }
965
966 static void rfcomm_tty_unthrottle(struct tty_struct *tty)
967 {
968 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
969
970 BT_DBG("tty %p dev %p", tty, dev);
971
972 rfcomm_dlc_unthrottle(dev->dlc);
973 }
974
975 static int rfcomm_tty_chars_in_buffer(struct tty_struct *tty)
976 {
977 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
978
979 BT_DBG("tty %p dev %p", tty, dev);
980
981 if (!dev || !dev->dlc)
982 return 0;
983
984 if (!skb_queue_empty(&dev->dlc->tx_queue))
985 return dev->dlc->mtu;
986
987 return 0;
988 }
989
990 static void rfcomm_tty_flush_buffer(struct tty_struct *tty)
991 {
992 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
993
994 BT_DBG("tty %p dev %p", tty, dev);
995
996 if (!dev || !dev->dlc)
997 return;
998
999 skb_queue_purge(&dev->dlc->tx_queue);
1000
1001 if (test_bit(TTY_DO_WRITE_WAKEUP, &tty->flags) && tty->ldisc.write_wakeup)
1002 tty->ldisc.write_wakeup(tty);
1003 }
1004
1005 static void rfcomm_tty_send_xchar(struct tty_struct *tty, char ch)
1006 {
1007 BT_DBG("tty %p ch %c", tty, ch);
1008 }
1009
1010 static void rfcomm_tty_wait_until_sent(struct tty_struct *tty, int timeout)
1011 {
1012 BT_DBG("tty %p timeout %d", tty, timeout);
1013 }
1014
1015 static void rfcomm_tty_hangup(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 if (!dev)
1022 return;
1023
1024 rfcomm_tty_flush_buffer(tty);
1025
1026 if (test_bit(RFCOMM_RELEASE_ONHUP, &dev->flags)) {
1027 if (rfcomm_dev_get(dev->id) == NULL)
1028 return;
1029 rfcomm_dev_del(dev);
1030 rfcomm_dev_put(dev);
1031 }
1032 }
1033
1034 static int rfcomm_tty_read_proc(char *buf, char **start, off_t offset, int len, int *eof, void *unused)
1035 {
1036 return 0;
1037 }
1038
1039 static int rfcomm_tty_tiocmget(struct tty_struct *tty, struct file *filp)
1040 {
1041 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
1042
1043 BT_DBG("tty %p dev %p", tty, dev);
1044
1045 return dev->modem_status;
1046 }
1047
1048 static int rfcomm_tty_tiocmset(struct tty_struct *tty, struct file *filp, unsigned int set, unsigned int clear)
1049 {
1050 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
1051 struct rfcomm_dlc *dlc = dev->dlc;
1052 u8 v24_sig;
1053
1054 BT_DBG("tty %p dev %p set 0x%02x clear 0x%02x", tty, dev, set, clear);
1055
1056 rfcomm_dlc_get_modem_status(dlc, &v24_sig);
1057
1058 if (set & TIOCM_DSR || set & TIOCM_DTR)
1059 v24_sig |= RFCOMM_V24_RTC;
1060 if (set & TIOCM_RTS || set & TIOCM_CTS)
1061 v24_sig |= RFCOMM_V24_RTR;
1062 if (set & TIOCM_RI)
1063 v24_sig |= RFCOMM_V24_IC;
1064 if (set & TIOCM_CD)
1065 v24_sig |= RFCOMM_V24_DV;
1066
1067 if (clear & TIOCM_DSR || clear & TIOCM_DTR)
1068 v24_sig &= ~RFCOMM_V24_RTC;
1069 if (clear & TIOCM_RTS || clear & TIOCM_CTS)
1070 v24_sig &= ~RFCOMM_V24_RTR;
1071 if (clear & TIOCM_RI)
1072 v24_sig &= ~RFCOMM_V24_IC;
1073 if (clear & TIOCM_CD)
1074 v24_sig &= ~RFCOMM_V24_DV;
1075
1076 rfcomm_dlc_set_modem_status(dlc, v24_sig);
1077
1078 return 0;
1079 }
1080
1081 /* ---- TTY structure ---- */
1082
1083 static const struct tty_operations rfcomm_ops = {
1084 .open = rfcomm_tty_open,
1085 .close = rfcomm_tty_close,
1086 .write = rfcomm_tty_write,
1087 .write_room = rfcomm_tty_write_room,
1088 .chars_in_buffer = rfcomm_tty_chars_in_buffer,
1089 .flush_buffer = rfcomm_tty_flush_buffer,
1090 .ioctl = rfcomm_tty_ioctl,
1091 .throttle = rfcomm_tty_throttle,
1092 .unthrottle = rfcomm_tty_unthrottle,
1093 .set_termios = rfcomm_tty_set_termios,
1094 .send_xchar = rfcomm_tty_send_xchar,
1095 .hangup = rfcomm_tty_hangup,
1096 .wait_until_sent = rfcomm_tty_wait_until_sent,
1097 .read_proc = rfcomm_tty_read_proc,
1098 .tiocmget = rfcomm_tty_tiocmget,
1099 .tiocmset = rfcomm_tty_tiocmset,
1100 };
1101
1102 int rfcomm_init_ttys(void)
1103 {
1104 rfcomm_tty_driver = alloc_tty_driver(RFCOMM_TTY_PORTS);
1105 if (!rfcomm_tty_driver)
1106 return -1;
1107
1108 rfcomm_tty_driver->owner = THIS_MODULE;
1109 rfcomm_tty_driver->driver_name = "rfcomm";
1110 rfcomm_tty_driver->name = "rfcomm";
1111 rfcomm_tty_driver->major = RFCOMM_TTY_MAJOR;
1112 rfcomm_tty_driver->minor_start = RFCOMM_TTY_MINOR;
1113 rfcomm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
1114 rfcomm_tty_driver->subtype = SERIAL_TYPE_NORMAL;
1115 rfcomm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1116 rfcomm_tty_driver->init_termios = tty_std_termios;
1117 rfcomm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1118 tty_set_operations(rfcomm_tty_driver, &rfcomm_ops);
1119
1120 if (tty_register_driver(rfcomm_tty_driver)) {
1121 BT_ERR("Can't register RFCOMM TTY driver");
1122 put_tty_driver(rfcomm_tty_driver);
1123 return -1;
1124 }
1125
1126 BT_INFO("RFCOMM TTY layer initialized");
1127
1128 return 0;
1129 }
1130
1131 void rfcomm_cleanup_ttys(void)
1132 {
1133 tty_unregister_driver(rfcomm_tty_driver);
1134 put_tty_driver(rfcomm_tty_driver);
1135 }
Linux kernel - Deliverables
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