1 /*
2 *
3 * Bluetooth HCI UART driver
4 *
5 * Copyright (C) 2000-2001 Qualcomm Incorporated
6 * Copyright (C) 2002-2003 Maxim Krasnyansky <maxk@qualcomm.com>
7 * Copyright (C) 2004-2005 Marcel Holtmann <marcel@holtmann.org>
8 *
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 *
24 */
25
26 #include <linux/module.h>
27
28 #include <linux/kernel.h>
29 #include <linux/init.h>
30 #include <linux/types.h>
31 #include <linux/fcntl.h>
32 #include <linux/interrupt.h>
33 #include <linux/ptrace.h>
34 #include <linux/poll.h>
35
36 #include <linux/slab.h>
37 #include <linux/tty.h>
38 #include <linux/errno.h>
39 #include <linux/string.h>
40 #include <linux/signal.h>
41 #include <linux/ioctl.h>
42 #include <linux/skbuff.h>
43 #include <linux/firmware.h>
44 #include <linux/serdev.h>
45
46 #include <net/bluetooth/bluetooth.h>
47 #include <net/bluetooth/hci_core.h>
48
49 #include "btintel.h"
50 #include "btbcm.h"
51 #include "hci_uart.h"
52
53 #define VERSION "2.3"
54
55 static const struct hci_uart_proto *hup[HCI_UART_MAX_PROTO];
56
hci_uart_register_proto(const struct hci_uart_proto * p)57 int hci_uart_register_proto(const struct hci_uart_proto *p)
58 {
59 if (p->id >= HCI_UART_MAX_PROTO)
60 return -EINVAL;
61
62 if (hup[p->id])
63 return -EEXIST;
64
65 hup[p->id] = p;
66
67 BT_INFO("HCI UART protocol %s registered", p->name);
68
69 return 0;
70 }
71
hci_uart_unregister_proto(const struct hci_uart_proto * p)72 int hci_uart_unregister_proto(const struct hci_uart_proto *p)
73 {
74 if (p->id >= HCI_UART_MAX_PROTO)
75 return -EINVAL;
76
77 if (!hup[p->id])
78 return -EINVAL;
79
80 hup[p->id] = NULL;
81
82 return 0;
83 }
84
hci_uart_get_proto(unsigned int id)85 static const struct hci_uart_proto *hci_uart_get_proto(unsigned int id)
86 {
87 if (id >= HCI_UART_MAX_PROTO)
88 return NULL;
89
90 return hup[id];
91 }
92
hci_uart_tx_complete(struct hci_uart * hu,int pkt_type)93 static inline void hci_uart_tx_complete(struct hci_uart *hu, int pkt_type)
94 {
95 struct hci_dev *hdev = hu->hdev;
96
97 /* Update HCI stat counters */
98 switch (pkt_type) {
99 case HCI_COMMAND_PKT:
100 hdev->stat.cmd_tx++;
101 break;
102
103 case HCI_ACLDATA_PKT:
104 hdev->stat.acl_tx++;
105 break;
106
107 case HCI_SCODATA_PKT:
108 hdev->stat.sco_tx++;
109 break;
110 }
111 }
112
hci_uart_dequeue(struct hci_uart * hu)113 static inline struct sk_buff *hci_uart_dequeue(struct hci_uart *hu)
114 {
115 struct sk_buff *skb = hu->tx_skb;
116
117 if (!skb) {
118 percpu_down_read(&hu->proto_lock);
119
120 if (test_bit(HCI_UART_PROTO_READY, &hu->flags))
121 skb = hu->proto->dequeue(hu);
122
123 percpu_up_read(&hu->proto_lock);
124 } else {
125 hu->tx_skb = NULL;
126 }
127
128 return skb;
129 }
130
hci_uart_tx_wakeup(struct hci_uart * hu)131 int hci_uart_tx_wakeup(struct hci_uart *hu)
132 {
133 /* This may be called in an IRQ context, so we can't sleep. Therefore
134 * we try to acquire the lock only, and if that fails we assume the
135 * tty is being closed because that is the only time the write lock is
136 * acquired. If, however, at some point in the future the write lock
137 * is also acquired in other situations, then this must be revisited.
138 */
139 if (!percpu_down_read_trylock(&hu->proto_lock))
140 return 0;
141
142 if (!test_bit(HCI_UART_PROTO_READY, &hu->flags))
143 goto no_schedule;
144
145 if (test_and_set_bit(HCI_UART_SENDING, &hu->tx_state)) {
146 set_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
147 goto no_schedule;
148 }
149
150 BT_DBG("");
151
152 schedule_work(&hu->write_work);
153
154 no_schedule:
155 percpu_up_read(&hu->proto_lock);
156
157 return 0;
158 }
159 EXPORT_SYMBOL_GPL(hci_uart_tx_wakeup);
160
hci_uart_write_work(struct work_struct * work)161 static void hci_uart_write_work(struct work_struct *work)
162 {
163 struct hci_uart *hu = container_of(work, struct hci_uart, write_work);
164 struct tty_struct *tty = hu->tty;
165 struct hci_dev *hdev = hu->hdev;
166 struct sk_buff *skb;
167
168 /* REVISIT: should we cope with bad skbs or ->write() returning
169 * and error value ?
170 */
171
172 restart:
173 clear_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
174
175 while ((skb = hci_uart_dequeue(hu))) {
176 int len;
177
178 set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
179 len = tty->ops->write(tty, skb->data, skb->len);
180 hdev->stat.byte_tx += len;
181
182 skb_pull(skb, len);
183 if (skb->len) {
184 hu->tx_skb = skb;
185 break;
186 }
187
188 hci_uart_tx_complete(hu, hci_skb_pkt_type(skb));
189 kfree_skb(skb);
190 }
191
192 if (test_bit(HCI_UART_TX_WAKEUP, &hu->tx_state))
193 goto restart;
194
195 clear_bit(HCI_UART_SENDING, &hu->tx_state);
196 }
197
hci_uart_init_work(struct work_struct * work)198 void hci_uart_init_work(struct work_struct *work)
199 {
200 struct hci_uart *hu = container_of(work, struct hci_uart, init_ready);
201 int err;
202 struct hci_dev *hdev;
203
204 if (!test_and_clear_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
205 return;
206
207 err = hci_register_dev(hu->hdev);
208 if (err < 0) {
209 BT_ERR("Can't register HCI device");
210 hdev = hu->hdev;
211 hu->hdev = NULL;
212 hci_free_dev(hdev);
213 clear_bit(HCI_UART_PROTO_READY, &hu->flags);
214 hu->proto->close(hu);
215 return;
216 }
217
218 set_bit(HCI_UART_REGISTERED, &hu->flags);
219 }
220
hci_uart_init_ready(struct hci_uart * hu)221 int hci_uart_init_ready(struct hci_uart *hu)
222 {
223 if (!test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
224 return -EALREADY;
225
226 schedule_work(&hu->init_ready);
227
228 return 0;
229 }
230
231 /* ------- Interface to HCI layer ------ */
232 /* Reset device */
hci_uart_flush(struct hci_dev * hdev)233 static int hci_uart_flush(struct hci_dev *hdev)
234 {
235 struct hci_uart *hu = hci_get_drvdata(hdev);
236 struct tty_struct *tty = hu->tty;
237
238 BT_DBG("hdev %p tty %p", hdev, tty);
239
240 if (hu->tx_skb) {
241 kfree_skb(hu->tx_skb); hu->tx_skb = NULL;
242 }
243
244 /* Flush any pending characters in the driver and discipline. */
245 tty_ldisc_flush(tty);
246 tty_driver_flush_buffer(tty);
247
248 percpu_down_read(&hu->proto_lock);
249
250 if (test_bit(HCI_UART_PROTO_READY, &hu->flags))
251 hu->proto->flush(hu);
252
253 percpu_up_read(&hu->proto_lock);
254
255 return 0;
256 }
257
258 /* Initialize device */
hci_uart_open(struct hci_dev * hdev)259 static int hci_uart_open(struct hci_dev *hdev)
260 {
261 BT_DBG("%s %p", hdev->name, hdev);
262
263 /* Undo clearing this from hci_uart_close() */
264 hdev->flush = hci_uart_flush;
265
266 return 0;
267 }
268
269 /* Close device */
hci_uart_close(struct hci_dev * hdev)270 static int hci_uart_close(struct hci_dev *hdev)
271 {
272 BT_DBG("hdev %p", hdev);
273
274 hci_uart_flush(hdev);
275 hdev->flush = NULL;
276 return 0;
277 }
278
279 /* Send frames from HCI layer */
hci_uart_send_frame(struct hci_dev * hdev,struct sk_buff * skb)280 static int hci_uart_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
281 {
282 struct hci_uart *hu = hci_get_drvdata(hdev);
283
284 BT_DBG("%s: type %d len %d", hdev->name, hci_skb_pkt_type(skb),
285 skb->len);
286
287 percpu_down_read(&hu->proto_lock);
288
289 if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) {
290 percpu_up_read(&hu->proto_lock);
291 return -EUNATCH;
292 }
293
294 hu->proto->enqueue(hu, skb);
295 percpu_up_read(&hu->proto_lock);
296
297 hci_uart_tx_wakeup(hu);
298
299 return 0;
300 }
301
302 /* Flow control or un-flow control the device */
hci_uart_set_flow_control(struct hci_uart * hu,bool enable)303 void hci_uart_set_flow_control(struct hci_uart *hu, bool enable)
304 {
305 struct tty_struct *tty = hu->tty;
306 struct ktermios ktermios;
307 int status;
308 unsigned int set = 0;
309 unsigned int clear = 0;
310
311 if (hu->serdev) {
312 serdev_device_set_flow_control(hu->serdev, !enable);
313 serdev_device_set_rts(hu->serdev, !enable);
314 return;
315 }
316
317 if (enable) {
318 /* Disable hardware flow control */
319 ktermios = tty->termios;
320 ktermios.c_cflag &= ~CRTSCTS;
321 status = tty_set_termios(tty, &ktermios);
322 BT_DBG("Disabling hardware flow control: %s",
323 status ? "failed" : "success");
324
325 /* Clear RTS to prevent the device from sending */
326 /* Most UARTs need OUT2 to enable interrupts */
327 status = tty->driver->ops->tiocmget(tty);
328 BT_DBG("Current tiocm 0x%x", status);
329
330 set &= ~(TIOCM_OUT2 | TIOCM_RTS);
331 clear = ~set;
332 set &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
333 TIOCM_OUT2 | TIOCM_LOOP;
334 clear &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
335 TIOCM_OUT2 | TIOCM_LOOP;
336 status = tty->driver->ops->tiocmset(tty, set, clear);
337 BT_DBG("Clearing RTS: %s", status ? "failed" : "success");
338 } else {
339 /* Set RTS to allow the device to send again */
340 status = tty->driver->ops->tiocmget(tty);
341 BT_DBG("Current tiocm 0x%x", status);
342
343 set |= (TIOCM_OUT2 | TIOCM_RTS);
344 clear = ~set;
345 set &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
346 TIOCM_OUT2 | TIOCM_LOOP;
347 clear &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
348 TIOCM_OUT2 | TIOCM_LOOP;
349 status = tty->driver->ops->tiocmset(tty, set, clear);
350 BT_DBG("Setting RTS: %s", status ? "failed" : "success");
351
352 /* Re-enable hardware flow control */
353 ktermios = tty->termios;
354 ktermios.c_cflag |= CRTSCTS;
355 status = tty_set_termios(tty, &ktermios);
356 BT_DBG("Enabling hardware flow control: %s",
357 status ? "failed" : "success");
358 }
359 }
360
hci_uart_set_speeds(struct hci_uart * hu,unsigned int init_speed,unsigned int oper_speed)361 void hci_uart_set_speeds(struct hci_uart *hu, unsigned int init_speed,
362 unsigned int oper_speed)
363 {
364 hu->init_speed = init_speed;
365 hu->oper_speed = oper_speed;
366 }
367
hci_uart_set_baudrate(struct hci_uart * hu,unsigned int speed)368 void hci_uart_set_baudrate(struct hci_uart *hu, unsigned int speed)
369 {
370 struct tty_struct *tty = hu->tty;
371 struct ktermios ktermios;
372
373 ktermios = tty->termios;
374 ktermios.c_cflag &= ~CBAUD;
375 tty_termios_encode_baud_rate(&ktermios, speed, speed);
376
377 /* tty_set_termios() return not checked as it is always 0 */
378 tty_set_termios(tty, &ktermios);
379
380 BT_DBG("%s: New tty speeds: %d/%d", hu->hdev->name,
381 tty->termios.c_ispeed, tty->termios.c_ospeed);
382 }
383
hci_uart_setup(struct hci_dev * hdev)384 static int hci_uart_setup(struct hci_dev *hdev)
385 {
386 struct hci_uart *hu = hci_get_drvdata(hdev);
387 struct hci_rp_read_local_version *ver;
388 struct sk_buff *skb;
389 unsigned int speed;
390 int err;
391
392 /* Init speed if any */
393 if (hu->init_speed)
394 speed = hu->init_speed;
395 else if (hu->proto->init_speed)
396 speed = hu->proto->init_speed;
397 else
398 speed = 0;
399
400 if (speed)
401 hci_uart_set_baudrate(hu, speed);
402
403 /* Operational speed if any */
404 if (hu->oper_speed)
405 speed = hu->oper_speed;
406 else if (hu->proto->oper_speed)
407 speed = hu->proto->oper_speed;
408 else
409 speed = 0;
410
411 if (hu->proto->set_baudrate && speed) {
412 err = hu->proto->set_baudrate(hu, speed);
413 if (!err)
414 hci_uart_set_baudrate(hu, speed);
415 }
416
417 if (hu->proto->setup)
418 return hu->proto->setup(hu);
419
420 if (!test_bit(HCI_UART_VND_DETECT, &hu->hdev_flags))
421 return 0;
422
423 skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_VERSION, 0, NULL,
424 HCI_INIT_TIMEOUT);
425 if (IS_ERR(skb)) {
426 BT_ERR("%s: Reading local version information failed (%ld)",
427 hdev->name, PTR_ERR(skb));
428 return 0;
429 }
430
431 if (skb->len != sizeof(*ver)) {
432 BT_ERR("%s: Event length mismatch for version information",
433 hdev->name);
434 goto done;
435 }
436
437 ver = (struct hci_rp_read_local_version *)skb->data;
438
439 switch (le16_to_cpu(ver->manufacturer)) {
440 #ifdef CONFIG_BT_HCIUART_INTEL
441 case 2:
442 hdev->set_bdaddr = btintel_set_bdaddr;
443 btintel_check_bdaddr(hdev);
444 break;
445 #endif
446 #ifdef CONFIG_BT_HCIUART_BCM
447 case 15:
448 hdev->set_bdaddr = btbcm_set_bdaddr;
449 btbcm_check_bdaddr(hdev);
450 break;
451 #endif
452 default:
453 break;
454 }
455
456 done:
457 kfree_skb(skb);
458 return 0;
459 }
460
461 /* ------ LDISC part ------ */
462 /* hci_uart_tty_open
463 *
464 * Called when line discipline changed to HCI_UART.
465 *
466 * Arguments:
467 * tty pointer to tty info structure
468 * Return Value:
469 * 0 if success, otherwise error code
470 */
hci_uart_tty_open(struct tty_struct * tty)471 static int hci_uart_tty_open(struct tty_struct *tty)
472 {
473 struct hci_uart *hu;
474
475 BT_DBG("tty %p", tty);
476
477 /* Error if the tty has no write op instead of leaving an exploitable
478 * hole
479 */
480 if (tty->ops->write == NULL)
481 return -EOPNOTSUPP;
482
483 hu = kzalloc(sizeof(struct hci_uart), GFP_KERNEL);
484 if (!hu) {
485 BT_ERR("Can't allocate control structure");
486 return -ENFILE;
487 }
488
489 tty->disc_data = hu;
490 hu->tty = tty;
491 tty->receive_room = 65536;
492
493 /* disable alignment support by default */
494 hu->alignment = 1;
495 hu->padding = 0;
496
497 INIT_WORK(&hu->init_ready, hci_uart_init_work);
498 INIT_WORK(&hu->write_work, hci_uart_write_work);
499
500 percpu_init_rwsem(&hu->proto_lock);
501
502 /* Flush any pending characters in the driver */
503 tty_driver_flush_buffer(tty);
504
505 return 0;
506 }
507
508 /* hci_uart_tty_close()
509 *
510 * Called when the line discipline is changed to something
511 * else, the tty is closed, or the tty detects a hangup.
512 */
hci_uart_tty_close(struct tty_struct * tty)513 static void hci_uart_tty_close(struct tty_struct *tty)
514 {
515 struct hci_uart *hu = tty->disc_data;
516 struct hci_dev *hdev;
517
518 BT_DBG("tty %p", tty);
519
520 /* Detach from the tty */
521 tty->disc_data = NULL;
522
523 if (!hu)
524 return;
525
526 hdev = hu->hdev;
527 if (hdev)
528 hci_uart_close(hdev);
529
530 if (test_bit(HCI_UART_PROTO_READY, &hu->flags)) {
531 percpu_down_write(&hu->proto_lock);
532 clear_bit(HCI_UART_PROTO_READY, &hu->flags);
533 percpu_up_write(&hu->proto_lock);
534
535 cancel_work_sync(&hu->write_work);
536
537 if (hdev) {
538 if (test_bit(HCI_UART_REGISTERED, &hu->flags))
539 hci_unregister_dev(hdev);
540 hci_free_dev(hdev);
541 }
542 hu->proto->close(hu);
543 }
544 clear_bit(HCI_UART_PROTO_SET, &hu->flags);
545
546 percpu_free_rwsem(&hu->proto_lock);
547
548 kfree(hu);
549 }
550
551 /* hci_uart_tty_wakeup()
552 *
553 * Callback for transmit wakeup. Called when low level
554 * device driver can accept more send data.
555 *
556 * Arguments: tty pointer to associated tty instance data
557 * Return Value: None
558 */
hci_uart_tty_wakeup(struct tty_struct * tty)559 static void hci_uart_tty_wakeup(struct tty_struct *tty)
560 {
561 struct hci_uart *hu = tty->disc_data;
562
563 BT_DBG("");
564
565 if (!hu)
566 return;
567
568 clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
569
570 if (tty != hu->tty)
571 return;
572
573 if (test_bit(HCI_UART_PROTO_READY, &hu->flags))
574 hci_uart_tx_wakeup(hu);
575 }
576
577 /* hci_uart_tty_receive()
578 *
579 * Called by tty low level driver when receive data is
580 * available.
581 *
582 * Arguments: tty pointer to tty isntance data
583 * data pointer to received data
584 * flags pointer to flags for data
585 * count count of received data in bytes
586 *
587 * Return Value: None
588 */
hci_uart_tty_receive(struct tty_struct * tty,const u8 * data,char * flags,int count)589 static void hci_uart_tty_receive(struct tty_struct *tty, const u8 *data,
590 char *flags, int count)
591 {
592 struct hci_uart *hu = tty->disc_data;
593
594 if (!hu || tty != hu->tty)
595 return;
596
597 percpu_down_read(&hu->proto_lock);
598
599 if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) {
600 percpu_up_read(&hu->proto_lock);
601 return;
602 }
603
604 /* It does not need a lock here as it is already protected by a mutex in
605 * tty caller
606 */
607 hu->proto->recv(hu, data, count);
608 percpu_up_read(&hu->proto_lock);
609
610 if (hu->hdev)
611 hu->hdev->stat.byte_rx += count;
612
613 tty_unthrottle(tty);
614 }
615
hci_uart_register_dev(struct hci_uart * hu)616 static int hci_uart_register_dev(struct hci_uart *hu)
617 {
618 struct hci_dev *hdev;
619
620 BT_DBG("");
621
622 /* Initialize and register HCI device */
623 hdev = hci_alloc_dev();
624 if (!hdev) {
625 BT_ERR("Can't allocate HCI device");
626 return -ENOMEM;
627 }
628
629 hu->hdev = hdev;
630
631 hdev->bus = HCI_UART;
632 hci_set_drvdata(hdev, hu);
633
634 /* Only when vendor specific setup callback is provided, consider
635 * the manufacturer information valid. This avoids filling in the
636 * value for Ericsson when nothing is specified.
637 */
638 if (hu->proto->setup)
639 hdev->manufacturer = hu->proto->manufacturer;
640
641 hdev->open = hci_uart_open;
642 hdev->close = hci_uart_close;
643 hdev->flush = hci_uart_flush;
644 hdev->send = hci_uart_send_frame;
645 hdev->setup = hci_uart_setup;
646 SET_HCIDEV_DEV(hdev, hu->tty->dev);
647
648 if (test_bit(HCI_UART_RAW_DEVICE, &hu->hdev_flags))
649 set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks);
650
651 if (test_bit(HCI_UART_EXT_CONFIG, &hu->hdev_flags))
652 set_bit(HCI_QUIRK_EXTERNAL_CONFIG, &hdev->quirks);
653
654 if (!test_bit(HCI_UART_RESET_ON_INIT, &hu->hdev_flags))
655 set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);
656
657 if (test_bit(HCI_UART_CREATE_AMP, &hu->hdev_flags))
658 hdev->dev_type = HCI_AMP;
659 else
660 hdev->dev_type = HCI_PRIMARY;
661
662 if (test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
663 return 0;
664
665 if (hci_register_dev(hdev) < 0) {
666 BT_ERR("Can't register HCI device");
667 hu->hdev = NULL;
668 hci_free_dev(hdev);
669 return -ENODEV;
670 }
671
672 set_bit(HCI_UART_REGISTERED, &hu->flags);
673
674 return 0;
675 }
676
hci_uart_set_proto(struct hci_uart * hu,int id)677 static int hci_uart_set_proto(struct hci_uart *hu, int id)
678 {
679 const struct hci_uart_proto *p;
680 int err;
681
682 p = hci_uart_get_proto(id);
683 if (!p)
684 return -EPROTONOSUPPORT;
685
686 err = p->open(hu);
687 if (err)
688 return err;
689
690 hu->proto = p;
691 set_bit(HCI_UART_PROTO_READY, &hu->flags);
692
693 err = hci_uart_register_dev(hu);
694 if (err) {
695 clear_bit(HCI_UART_PROTO_READY, &hu->flags);
696 p->close(hu);
697 return err;
698 }
699
700 return 0;
701 }
702
hci_uart_set_flags(struct hci_uart * hu,unsigned long flags)703 static int hci_uart_set_flags(struct hci_uart *hu, unsigned long flags)
704 {
705 unsigned long valid_flags = BIT(HCI_UART_RAW_DEVICE) |
706 BIT(HCI_UART_RESET_ON_INIT) |
707 BIT(HCI_UART_CREATE_AMP) |
708 BIT(HCI_UART_INIT_PENDING) |
709 BIT(HCI_UART_EXT_CONFIG) |
710 BIT(HCI_UART_VND_DETECT);
711
712 if (flags & ~valid_flags)
713 return -EINVAL;
714
715 hu->hdev_flags = flags;
716
717 return 0;
718 }
719
720 /* hci_uart_tty_ioctl()
721 *
722 * Process IOCTL system call for the tty device.
723 *
724 * Arguments:
725 *
726 * tty pointer to tty instance data
727 * file pointer to open file object for device
728 * cmd IOCTL command code
729 * arg argument for IOCTL call (cmd dependent)
730 *
731 * Return Value: Command dependent
732 */
hci_uart_tty_ioctl(struct tty_struct * tty,struct file * file,unsigned int cmd,unsigned long arg)733 static int hci_uart_tty_ioctl(struct tty_struct *tty, struct file *file,
734 unsigned int cmd, unsigned long arg)
735 {
736 struct hci_uart *hu = tty->disc_data;
737 int err = 0;
738
739 BT_DBG("");
740
741 /* Verify the status of the device */
742 if (!hu)
743 return -EBADF;
744
745 switch (cmd) {
746 case HCIUARTSETPROTO:
747 if (!test_and_set_bit(HCI_UART_PROTO_SET, &hu->flags)) {
748 err = hci_uart_set_proto(hu, arg);
749 if (err)
750 clear_bit(HCI_UART_PROTO_SET, &hu->flags);
751 } else
752 err = -EBUSY;
753 break;
754
755 case HCIUARTGETPROTO:
756 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
757 err = hu->proto->id;
758 else
759 err = -EUNATCH;
760 break;
761
762 case HCIUARTGETDEVICE:
763 if (test_bit(HCI_UART_REGISTERED, &hu->flags))
764 err = hu->hdev->id;
765 else
766 err = -EUNATCH;
767 break;
768
769 case HCIUARTSETFLAGS:
770 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
771 err = -EBUSY;
772 else
773 err = hci_uart_set_flags(hu, arg);
774 break;
775
776 case HCIUARTGETFLAGS:
777 err = hu->hdev_flags;
778 break;
779
780 default:
781 err = n_tty_ioctl_helper(tty, file, cmd, arg);
782 break;
783 }
784
785 return err;
786 }
787
788 /*
789 * We don't provide read/write/poll interface for user space.
790 */
hci_uart_tty_read(struct tty_struct * tty,struct file * file,unsigned char __user * buf,size_t nr)791 static ssize_t hci_uart_tty_read(struct tty_struct *tty, struct file *file,
792 unsigned char __user *buf, size_t nr)
793 {
794 return 0;
795 }
796
hci_uart_tty_write(struct tty_struct * tty,struct file * file,const unsigned char * data,size_t count)797 static ssize_t hci_uart_tty_write(struct tty_struct *tty, struct file *file,
798 const unsigned char *data, size_t count)
799 {
800 return 0;
801 }
802
hci_uart_tty_poll(struct tty_struct * tty,struct file * filp,poll_table * wait)803 static __poll_t hci_uart_tty_poll(struct tty_struct *tty,
804 struct file *filp, poll_table *wait)
805 {
806 return 0;
807 }
808
hci_uart_init(void)809 static int __init hci_uart_init(void)
810 {
811 static struct tty_ldisc_ops hci_uart_ldisc;
812 int err;
813
814 BT_INFO("HCI UART driver ver %s", VERSION);
815
816 /* Register the tty discipline */
817
818 memset(&hci_uart_ldisc, 0, sizeof(hci_uart_ldisc));
819 hci_uart_ldisc.magic = TTY_LDISC_MAGIC;
820 hci_uart_ldisc.name = "n_hci";
821 hci_uart_ldisc.open = hci_uart_tty_open;
822 hci_uart_ldisc.close = hci_uart_tty_close;
823 hci_uart_ldisc.read = hci_uart_tty_read;
824 hci_uart_ldisc.write = hci_uart_tty_write;
825 hci_uart_ldisc.ioctl = hci_uart_tty_ioctl;
826 hci_uart_ldisc.poll = hci_uart_tty_poll;
827 hci_uart_ldisc.receive_buf = hci_uart_tty_receive;
828 hci_uart_ldisc.write_wakeup = hci_uart_tty_wakeup;
829 hci_uart_ldisc.owner = THIS_MODULE;
830
831 err = tty_register_ldisc(N_HCI, &hci_uart_ldisc);
832 if (err) {
833 BT_ERR("HCI line discipline registration failed. (%d)", err);
834 return err;
835 }
836
837 #ifdef CONFIG_BT_HCIUART_H4
838 h4_init();
839 #endif
840 #ifdef CONFIG_BT_HCIUART_BCSP
841 bcsp_init();
842 #endif
843 #ifdef CONFIG_BT_HCIUART_LL
844 ll_init();
845 #endif
846 #ifdef CONFIG_BT_HCIUART_ATH3K
847 ath_init();
848 #endif
849 #ifdef CONFIG_BT_HCIUART_3WIRE
850 h5_init();
851 #endif
852 #ifdef CONFIG_BT_HCIUART_INTEL
853 intel_init();
854 #endif
855 #ifdef CONFIG_BT_HCIUART_BCM
856 bcm_init();
857 #endif
858 #ifdef CONFIG_BT_HCIUART_QCA
859 qca_init();
860 #endif
861 #ifdef CONFIG_BT_HCIUART_AG6XX
862 ag6xx_init();
863 #endif
864 #ifdef CONFIG_BT_HCIUART_MRVL
865 mrvl_init();
866 #endif
867
868 return 0;
869 }
870
hci_uart_exit(void)871 static void __exit hci_uart_exit(void)
872 {
873 int err;
874
875 #ifdef CONFIG_BT_HCIUART_H4
876 h4_deinit();
877 #endif
878 #ifdef CONFIG_BT_HCIUART_BCSP
879 bcsp_deinit();
880 #endif
881 #ifdef CONFIG_BT_HCIUART_LL
882 ll_deinit();
883 #endif
884 #ifdef CONFIG_BT_HCIUART_ATH3K
885 ath_deinit();
886 #endif
887 #ifdef CONFIG_BT_HCIUART_3WIRE
888 h5_deinit();
889 #endif
890 #ifdef CONFIG_BT_HCIUART_INTEL
891 intel_deinit();
892 #endif
893 #ifdef CONFIG_BT_HCIUART_BCM
894 bcm_deinit();
895 #endif
896 #ifdef CONFIG_BT_HCIUART_QCA
897 qca_deinit();
898 #endif
899 #ifdef CONFIG_BT_HCIUART_AG6XX
900 ag6xx_deinit();
901 #endif
902 #ifdef CONFIG_BT_HCIUART_MRVL
903 mrvl_deinit();
904 #endif
905
906 /* Release tty registration of line discipline */
907 err = tty_unregister_ldisc(N_HCI);
908 if (err)
909 BT_ERR("Can't unregister HCI line discipline (%d)", err);
910 }
911
912 module_init(hci_uart_init);
913 module_exit(hci_uart_exit);
914
915 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
916 MODULE_DESCRIPTION("Bluetooth HCI UART driver ver " VERSION);
917 MODULE_VERSION(VERSION);
918 MODULE_LICENSE("GPL");
919 MODULE_ALIAS_LDISC(N_HCI);
920
