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[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 if (!test_bit(RFCOMM_RELEASE_ONHUP, &dev->flags))
433 rfcomm_dev_del(dev);
434 rfcomm_dev_put(dev);
435 return 0;
436 }
437
438 static int rfcomm_get_dev_list(void __user *arg)
439 {
440 struct rfcomm_dev_list_req *dl;
441 struct rfcomm_dev_info *di;
442 struct list_head *p;
443 int n = 0, size, err;
444 u16 dev_num;
445
446 BT_DBG("");
447
448 if (get_user(dev_num, (u16 __user *) arg))
449 return -EFAULT;
450
451 if (!dev_num || dev_num > (PAGE_SIZE * 4) / sizeof(*di))
452 return -EINVAL;
453
454 size = sizeof(*dl) + dev_num * sizeof(*di);
455
456 if (!(dl = kmalloc(size, GFP_KERNEL)))
457 return -ENOMEM;
458
459 di = dl->dev_info;
460
461 read_lock_bh(&rfcomm_dev_lock);
462
463 list_for_each(p, &rfcomm_dev_list) {
464 struct rfcomm_dev *dev = list_entry(p, struct rfcomm_dev, list);
465 if (test_bit(RFCOMM_TTY_RELEASED, &dev->flags))
466 continue;
467 (di + n)->id = dev->id;
468 (di + n)->flags = dev->flags;
469 (di + n)->state = dev->dlc->state;
470 (di + n)->channel = dev->channel;
471 bacpy(&(di + n)->src, &dev->src);
472 bacpy(&(di + n)->dst, &dev->dst);
473 if (++n >= dev_num)
474 break;
475 }
476
477 read_unlock_bh(&rfcomm_dev_lock);
478
479 dl->dev_num = n;
480 size = sizeof(*dl) + n * sizeof(*di);
481
482 err = copy_to_user(arg, dl, size);
483 kfree(dl);
484
485 return err ? -EFAULT : 0;
486 }
487
488 static int rfcomm_get_dev_info(void __user *arg)
489 {
490 struct rfcomm_dev *dev;
491 struct rfcomm_dev_info di;
492 int err = 0;
493
494 BT_DBG("");
495
496 if (copy_from_user(&di, arg, sizeof(di)))
497 return -EFAULT;
498
499 if (!(dev = rfcomm_dev_get(di.id)))
500 return -ENODEV;
501
502 di.flags = dev->flags;
503 di.channel = dev->channel;
504 di.state = dev->dlc->state;
505 bacpy(&di.src, &dev->src);
506 bacpy(&di.dst, &dev->dst);
507
508 if (copy_to_user(arg, &di, sizeof(di)))
509 err = -EFAULT;
510
511 rfcomm_dev_put(dev);
512 return err;
513 }
514
515 int rfcomm_dev_ioctl(struct sock *sk, unsigned int cmd, void __user *arg)
516 {
517 BT_DBG("cmd %d arg %p", cmd, arg);
518
519 switch (cmd) {
520 case RFCOMMCREATEDEV:
521 return rfcomm_create_dev(sk, arg);
522
523 case RFCOMMRELEASEDEV:
524 return rfcomm_release_dev(arg);
525
526 case RFCOMMGETDEVLIST:
527 return rfcomm_get_dev_list(arg);
528
529 case RFCOMMGETDEVINFO:
530 return rfcomm_get_dev_info(arg);
531 }
532
533 return -EINVAL;
534 }
535
536 /* ---- DLC callbacks ---- */
537 static void rfcomm_dev_data_ready(struct rfcomm_dlc *dlc, struct sk_buff *skb)
538 {
539 struct rfcomm_dev *dev = dlc->owner;
540 struct tty_struct *tty;
541
542 if (!dev || !(tty = dev->tty)) {
543 kfree_skb(skb);
544 return;
545 }
546
547 BT_DBG("dlc %p tty %p len %d", dlc, tty, skb->len);
548
549 tty_insert_flip_string(tty, skb->data, skb->len);
550 tty_flip_buffer_push(tty);
551
552 kfree_skb(skb);
553 }
554
555 static void rfcomm_dev_state_change(struct rfcomm_dlc *dlc, int err)
556 {
557 struct rfcomm_dev *dev = dlc->owner;
558 if (!dev)
559 return;
560
561 BT_DBG("dlc %p dev %p err %d", dlc, dev, err);
562
563 dev->err = err;
564 wake_up_interruptible(&dev->wait);
565
566 if (dlc->state == BT_CLOSED) {
567 if (!dev->tty) {
568 if (test_bit(RFCOMM_RELEASE_ONHUP, &dev->flags)) {
569 /* Drop DLC lock here to avoid deadlock
570 * 1. rfcomm_dev_get will take rfcomm_dev_lock
571 * but in rfcomm_dev_add there's lock order:
572 * rfcomm_dev_lock -> dlc lock
573 * 2. rfcomm_dev_put will deadlock if it's
574 * the last reference
575 */
576 rfcomm_dlc_unlock(dlc);
577 if (rfcomm_dev_get(dev->id) == NULL) {
578 rfcomm_dlc_lock(dlc);
579 return;
580 }
581
582 rfcomm_dev_del(dev);
583 rfcomm_dev_put(dev);
584 rfcomm_dlc_lock(dlc);
585 }
586 } else
587 tty_hangup(dev->tty);
588 }
589 }
590
591 static void rfcomm_dev_modem_status(struct rfcomm_dlc *dlc, u8 v24_sig)
592 {
593 struct rfcomm_dev *dev = dlc->owner;
594 if (!dev)
595 return;
596
597 BT_DBG("dlc %p dev %p v24_sig 0x%02x", dlc, dev, v24_sig);
598
599 if ((dev->modem_status & TIOCM_CD) && !(v24_sig & RFCOMM_V24_DV)) {
600 if (dev->tty && !C_CLOCAL(dev->tty))
601 tty_hangup(dev->tty);
602 }
603
604 dev->modem_status =
605 ((v24_sig & RFCOMM_V24_RTC) ? (TIOCM_DSR | TIOCM_DTR) : 0) |
606 ((v24_sig & RFCOMM_V24_RTR) ? (TIOCM_RTS | TIOCM_CTS) : 0) |
607 ((v24_sig & RFCOMM_V24_IC) ? TIOCM_RI : 0) |
608 ((v24_sig & RFCOMM_V24_DV) ? TIOCM_CD : 0);
609 }
610
611 /* ---- TTY functions ---- */
612 static void rfcomm_tty_wakeup(unsigned long arg)
613 {
614 struct rfcomm_dev *dev = (void *) arg;
615 struct tty_struct *tty = dev->tty;
616 if (!tty)
617 return;
618
619 BT_DBG("dev %p tty %p", dev, tty);
620 tty_wakeup(tty);
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 if (dev->tty_dev->parent)
700 device_move(dev->tty_dev, NULL);
701
702 /* Close DLC and dettach TTY */
703 rfcomm_dlc_close(dev->dlc, 0);
704
705 clear_bit(RFCOMM_TTY_ATTACHED, &dev->flags);
706 tasklet_kill(&dev->wakeup_task);
707
708 rfcomm_dlc_lock(dev->dlc);
709 tty->driver_data = NULL;
710 dev->tty = NULL;
711 rfcomm_dlc_unlock(dev->dlc);
712 }
713
714 rfcomm_dev_put(dev);
715 }
716
717 static int rfcomm_tty_write(struct tty_struct *tty, const unsigned char *buf, int count)
718 {
719 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
720 struct rfcomm_dlc *dlc = dev->dlc;
721 struct sk_buff *skb;
722 int err = 0, sent = 0, size;
723
724 BT_DBG("tty %p count %d", tty, count);
725
726 while (count) {
727 size = min_t(uint, count, dlc->mtu);
728
729 skb = rfcomm_wmalloc(dev, size + RFCOMM_SKB_RESERVE, GFP_ATOMIC);
730
731 if (!skb)
732 break;
733
734 skb_reserve(skb, RFCOMM_SKB_HEAD_RESERVE);
735
736 memcpy(skb_put(skb, size), buf + sent, size);
737
738 if ((err = rfcomm_dlc_send(dlc, skb)) < 0) {
739 kfree_skb(skb);
740 break;
741 }
742
743 sent += size;
744 count -= size;
745 }
746
747 return sent ? sent : err;
748 }
749
750 static int rfcomm_tty_write_room(struct tty_struct *tty)
751 {
752 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
753 int room;
754
755 BT_DBG("tty %p", tty);
756
757 if (!dev || !dev->dlc)
758 return 0;
759
760 room = rfcomm_room(dev->dlc) - atomic_read(&dev->wmem_alloc);
761 if (room < 0)
762 room = 0;
763
764 return room;
765 }
766
767 static int rfcomm_tty_ioctl(struct tty_struct *tty, struct file *filp, unsigned int cmd, unsigned long arg)
768 {
769 BT_DBG("tty %p cmd 0x%02x", tty, cmd);
770
771 switch (cmd) {
772 case TCGETS:
773 BT_DBG("TCGETS is not supported");
774 return -ENOIOCTLCMD;
775
776 case TCSETS:
777 BT_DBG("TCSETS is not supported");
778 return -ENOIOCTLCMD;
779
780 case TIOCMIWAIT:
781 BT_DBG("TIOCMIWAIT");
782 break;
783
784 case TIOCGICOUNT:
785 BT_DBG("TIOCGICOUNT");
786 break;
787
788 case TIOCGSERIAL:
789 BT_ERR("TIOCGSERIAL is not supported");
790 return -ENOIOCTLCMD;
791
792 case TIOCSSERIAL:
793 BT_ERR("TIOCSSERIAL is not supported");
794 return -ENOIOCTLCMD;
795
796 case TIOCSERGSTRUCT:
797 BT_ERR("TIOCSERGSTRUCT is not supported");
798 return -ENOIOCTLCMD;
799
800 case TIOCSERGETLSR:
801 BT_ERR("TIOCSERGETLSR is not supported");
802 return -ENOIOCTLCMD;
803
804 case TIOCSERCONFIG:
805 BT_ERR("TIOCSERCONFIG is not supported");
806 return -ENOIOCTLCMD;
807
808 default:
809 return -ENOIOCTLCMD; /* ioctls which we must ignore */
810
811 }
812
813 return -ENOIOCTLCMD;
814 }
815
816 static void rfcomm_tty_set_termios(struct tty_struct *tty, struct ktermios *old)
817 {
818 struct ktermios *new = tty->termios;
819 int old_baud_rate = tty_termios_baud_rate(old);
820 int new_baud_rate = tty_termios_baud_rate(new);
821
822 u8 baud, data_bits, stop_bits, parity, x_on, x_off;
823 u16 changes = 0;
824
825 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
826
827 BT_DBG("tty %p termios %p", tty, old);
828
829 if (!dev || !dev->dlc || !dev->dlc->session)
830 return;
831
832 /* Handle turning off CRTSCTS */
833 if ((old->c_cflag & CRTSCTS) && !(new->c_cflag & CRTSCTS))
834 BT_DBG("Turning off CRTSCTS unsupported");
835
836 /* Parity on/off and when on, odd/even */
837 if (((old->c_cflag & PARENB) != (new->c_cflag & PARENB)) ||
838 ((old->c_cflag & PARODD) != (new->c_cflag & PARODD)) ) {
839 changes |= RFCOMM_RPN_PM_PARITY;
840 BT_DBG("Parity change detected.");
841 }
842
843 /* Mark and space parity are not supported! */
844 if (new->c_cflag & PARENB) {
845 if (new->c_cflag & PARODD) {
846 BT_DBG("Parity is ODD");
847 parity = RFCOMM_RPN_PARITY_ODD;
848 } else {
849 BT_DBG("Parity is EVEN");
850 parity = RFCOMM_RPN_PARITY_EVEN;
851 }
852 } else {
853 BT_DBG("Parity is OFF");
854 parity = RFCOMM_RPN_PARITY_NONE;
855 }
856
857 /* Setting the x_on / x_off characters */
858 if (old->c_cc[VSTOP] != new->c_cc[VSTOP]) {
859 BT_DBG("XOFF custom");
860 x_on = new->c_cc[VSTOP];
861 changes |= RFCOMM_RPN_PM_XON;
862 } else {
863 BT_DBG("XOFF default");
864 x_on = RFCOMM_RPN_XON_CHAR;
865 }
866
867 if (old->c_cc[VSTART] != new->c_cc[VSTART]) {
868 BT_DBG("XON custom");
869 x_off = new->c_cc[VSTART];
870 changes |= RFCOMM_RPN_PM_XOFF;
871 } else {
872 BT_DBG("XON default");
873 x_off = RFCOMM_RPN_XOFF_CHAR;
874 }
875
876 /* Handle setting of stop bits */
877 if ((old->c_cflag & CSTOPB) != (new->c_cflag & CSTOPB))
878 changes |= RFCOMM_RPN_PM_STOP;
879
880 /* POSIX does not support 1.5 stop bits and RFCOMM does not
881 * support 2 stop bits. So a request for 2 stop bits gets
882 * translated to 1.5 stop bits */
883 if (new->c_cflag & CSTOPB) {
884 stop_bits = RFCOMM_RPN_STOP_15;
885 } else {
886 stop_bits = RFCOMM_RPN_STOP_1;
887 }
888
889 /* Handle number of data bits [5-8] */
890 if ((old->c_cflag & CSIZE) != (new->c_cflag & CSIZE))
891 changes |= RFCOMM_RPN_PM_DATA;
892
893 switch (new->c_cflag & CSIZE) {
894 case CS5:
895 data_bits = RFCOMM_RPN_DATA_5;
896 break;
897 case CS6:
898 data_bits = RFCOMM_RPN_DATA_6;
899 break;
900 case CS7:
901 data_bits = RFCOMM_RPN_DATA_7;
902 break;
903 case CS8:
904 data_bits = RFCOMM_RPN_DATA_8;
905 break;
906 default:
907 data_bits = RFCOMM_RPN_DATA_8;
908 break;
909 }
910
911 /* Handle baudrate settings */
912 if (old_baud_rate != new_baud_rate)
913 changes |= RFCOMM_RPN_PM_BITRATE;
914
915 switch (new_baud_rate) {
916 case 2400:
917 baud = RFCOMM_RPN_BR_2400;
918 break;
919 case 4800:
920 baud = RFCOMM_RPN_BR_4800;
921 break;
922 case 7200:
923 baud = RFCOMM_RPN_BR_7200;
924 break;
925 case 9600:
926 baud = RFCOMM_RPN_BR_9600;
927 break;
928 case 19200:
929 baud = RFCOMM_RPN_BR_19200;
930 break;
931 case 38400:
932 baud = RFCOMM_RPN_BR_38400;
933 break;
934 case 57600:
935 baud = RFCOMM_RPN_BR_57600;
936 break;
937 case 115200:
938 baud = RFCOMM_RPN_BR_115200;
939 break;
940 case 230400:
941 baud = RFCOMM_RPN_BR_230400;
942 break;
943 default:
944 /* 9600 is standard accordinag to the RFCOMM specification */
945 baud = RFCOMM_RPN_BR_9600;
946 break;
947
948 }
949
950 if (changes)
951 rfcomm_send_rpn(dev->dlc->session, 1, dev->dlc->dlci, baud,
952 data_bits, stop_bits, parity,
953 RFCOMM_RPN_FLOW_NONE, x_on, x_off, changes);
954
955 return;
956 }
957
958 static void rfcomm_tty_throttle(struct tty_struct *tty)
959 {
960 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
961
962 BT_DBG("tty %p dev %p", tty, dev);
963
964 rfcomm_dlc_throttle(dev->dlc);
965 }
966
967 static void rfcomm_tty_unthrottle(struct tty_struct *tty)
968 {
969 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
970
971 BT_DBG("tty %p dev %p", tty, dev);
972
973 rfcomm_dlc_unthrottle(dev->dlc);
974 }
975
976 static int rfcomm_tty_chars_in_buffer(struct tty_struct *tty)
977 {
978 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
979
980 BT_DBG("tty %p dev %p", tty, dev);
981
982 if (!dev || !dev->dlc)
983 return 0;
984
985 if (!skb_queue_empty(&dev->dlc->tx_queue))
986 return dev->dlc->mtu;
987
988 return 0;
989 }
990
991 static void rfcomm_tty_flush_buffer(struct tty_struct *tty)
992 {
993 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
994
995 BT_DBG("tty %p dev %p", tty, dev);
996
997 if (!dev || !dev->dlc)
998 return;
999
1000 skb_queue_purge(&dev->dlc->tx_queue);
1001 tty_wakeup(tty);
1002 }
1003
1004 static void rfcomm_tty_send_xchar(struct tty_struct *tty, char ch)
1005 {
1006 BT_DBG("tty %p ch %c", tty, ch);
1007 }
1008
1009 static void rfcomm_tty_wait_until_sent(struct tty_struct *tty, int timeout)
1010 {
1011 BT_DBG("tty %p timeout %d", tty, timeout);
1012 }
1013
1014 static void rfcomm_tty_hangup(struct tty_struct *tty)
1015 {
1016 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
1017
1018 BT_DBG("tty %p dev %p", tty, dev);
1019
1020 if (!dev)
1021 return;
1022
1023 rfcomm_tty_flush_buffer(tty);
1024
1025 if (test_bit(RFCOMM_RELEASE_ONHUP, &dev->flags)) {
1026 if (rfcomm_dev_get(dev->id) == NULL)
1027 return;
1028 rfcomm_dev_del(dev);
1029 rfcomm_dev_put(dev);
1030 }
1031 }
1032
1033 static int rfcomm_tty_read_proc(char *buf, char **start, off_t offset, int len, int *eof, void *unused)
1034 {
1035 return 0;
1036 }
1037
1038 static int rfcomm_tty_tiocmget(struct tty_struct *tty, struct file *filp)
1039 {
1040 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
1041
1042 BT_DBG("tty %p dev %p", tty, dev);
1043
1044 return dev->modem_status;
1045 }
1046
1047 static int rfcomm_tty_tiocmset(struct tty_struct *tty, struct file *filp, unsigned int set, unsigned int clear)
1048 {
1049 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
1050 struct rfcomm_dlc *dlc = dev->dlc;
1051 u8 v24_sig;
1052
1053 BT_DBG("tty %p dev %p set 0x%02x clear 0x%02x", tty, dev, set, clear);
1054
1055 rfcomm_dlc_get_modem_status(dlc, &v24_sig);
1056
1057 if (set & TIOCM_DSR || set & TIOCM_DTR)
1058 v24_sig |= RFCOMM_V24_RTC;
1059 if (set & TIOCM_RTS || set & TIOCM_CTS)
1060 v24_sig |= RFCOMM_V24_RTR;
1061 if (set & TIOCM_RI)
1062 v24_sig |= RFCOMM_V24_IC;
1063 if (set & TIOCM_CD)
1064 v24_sig |= RFCOMM_V24_DV;
1065
1066 if (clear & TIOCM_DSR || clear & TIOCM_DTR)
1067 v24_sig &= ~RFCOMM_V24_RTC;
1068 if (clear & TIOCM_RTS || clear & TIOCM_CTS)
1069 v24_sig &= ~RFCOMM_V24_RTR;
1070 if (clear & TIOCM_RI)
1071 v24_sig &= ~RFCOMM_V24_IC;
1072 if (clear & TIOCM_CD)
1073 v24_sig &= ~RFCOMM_V24_DV;
1074
1075 rfcomm_dlc_set_modem_status(dlc, v24_sig);
1076
1077 return 0;
1078 }
1079
1080 /* ---- TTY structure ---- */
1081
1082 static const struct tty_operations rfcomm_ops = {
1083 .open = rfcomm_tty_open,
1084 .close = rfcomm_tty_close,
1085 .write = rfcomm_tty_write,
1086 .write_room = rfcomm_tty_write_room,
1087 .chars_in_buffer = rfcomm_tty_chars_in_buffer,
1088 .flush_buffer = rfcomm_tty_flush_buffer,
1089 .ioctl = rfcomm_tty_ioctl,
1090 .throttle = rfcomm_tty_throttle,
1091 .unthrottle = rfcomm_tty_unthrottle,
1092 .set_termios = rfcomm_tty_set_termios,
1093 .send_xchar = rfcomm_tty_send_xchar,
1094 .hangup = rfcomm_tty_hangup,
1095 .wait_until_sent = rfcomm_tty_wait_until_sent,
1096 .read_proc = rfcomm_tty_read_proc,
1097 .tiocmget = rfcomm_tty_tiocmget,
1098 .tiocmset = rfcomm_tty_tiocmset,
1099 };
1100
1101 int rfcomm_init_ttys(void)
1102 {
1103 rfcomm_tty_driver = alloc_tty_driver(RFCOMM_TTY_PORTS);
1104 if (!rfcomm_tty_driver)
1105 return -1;
1106
1107 rfcomm_tty_driver->owner = THIS_MODULE;
1108 rfcomm_tty_driver->driver_name = "rfcomm";
1109 rfcomm_tty_driver->name = "rfcomm";
1110 rfcomm_tty_driver->major = RFCOMM_TTY_MAJOR;
1111 rfcomm_tty_driver->minor_start = RFCOMM_TTY_MINOR;
1112 rfcomm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
1113 rfcomm_tty_driver->subtype = SERIAL_TYPE_NORMAL;
1114 rfcomm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1115 rfcomm_tty_driver->init_termios = tty_std_termios;
1116 rfcomm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1117 tty_set_operations(rfcomm_tty_driver, &rfcomm_ops);
1118
1119 if (tty_register_driver(rfcomm_tty_driver)) {
1120 BT_ERR("Can't register RFCOMM TTY driver");
1121 put_tty_driver(rfcomm_tty_driver);
1122 return -1;
1123 }
1124
1125 BT_INFO("RFCOMM TTY layer initialized");
1126
1127 return 0;
1128 }
1129
1130 void rfcomm_cleanup_ttys(void)
1131 {
1132 tty_unregister_driver(rfcomm_tty_driver);
1133 put_tty_driver(rfcomm_tty_driver);
1134 }
Linux kernel - Deliverables
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