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