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
55static const struct hci_uart_proto *hup[HCI_UART_MAX_PROTO];
56
57int 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
72int 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
85static 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
93static 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
113static 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
131int 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
154no_schedule:
155 percpu_up_read(&hu->proto_lock);
156
157 return 0;
158}
159EXPORT_SYMBOL_GPL(hci_uart_tx_wakeup);
160
161static 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
172restart:
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
198void 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 clear_bit(HCI_UART_PROTO_READY, &hu->flags);
211 hu->proto->close(hu);
212 hdev = hu->hdev;
213 hu->hdev = NULL;
214 hci_free_dev(hdev);
215 return;
216 }
217
218 set_bit(HCI_UART_REGISTERED, &hu->flags);
219}
220
221int 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 */
233static 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 */
259static 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 */
270static 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 */
280static 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 */
303void 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
361void 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
368void 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
384static 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
456done:
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 */
471static 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 */
513static 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 */
559static 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 */
589static 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
616static int hci_uart_register_dev(struct hci_uart *hu)
617{
618 struct hci_dev *hdev;
619 int err;
620
621 BT_DBG("");
622
623 /* Initialize and register HCI device */
624 hdev = hci_alloc_dev();
625 if (!hdev) {
626 BT_ERR("Can't allocate HCI device");
627 return -ENOMEM;
628 }
629
630 hu->hdev = hdev;
631
632 hdev->bus = HCI_UART;
633 hci_set_drvdata(hdev, hu);
634
635 /* Only when vendor specific setup callback is provided, consider
636 * the manufacturer information valid. This avoids filling in the
637 * value for Ericsson when nothing is specified.
638 */
639 if (hu->proto->setup)
640 hdev->manufacturer = hu->proto->manufacturer;
641
642 hdev->open = hci_uart_open;
643 hdev->close = hci_uart_close;
644 hdev->flush = hci_uart_flush;
645 hdev->send = hci_uart_send_frame;
646 hdev->setup = hci_uart_setup;
647 SET_HCIDEV_DEV(hdev, hu->tty->dev);
648
649 if (test_bit(HCI_UART_RAW_DEVICE, &hu->hdev_flags))
650 set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks);
651
652 if (test_bit(HCI_UART_EXT_CONFIG, &hu->hdev_flags))
653 set_bit(HCI_QUIRK_EXTERNAL_CONFIG, &hdev->quirks);
654
655 if (!test_bit(HCI_UART_RESET_ON_INIT, &hu->hdev_flags))
656 set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);
657
658 if (test_bit(HCI_UART_CREATE_AMP, &hu->hdev_flags))
659 hdev->dev_type = HCI_AMP;
660 else
661 hdev->dev_type = HCI_PRIMARY;
662
663 /* Only call open() for the protocol after hdev is fully initialized as
664 * open() (or a timer/workqueue it starts) may attempt to reference it.
665 */
666 err = hu->proto->open(hu);
667 if (err) {
668 hu->hdev = NULL;
669 hci_free_dev(hdev);
670 return err;
671 }
672
673 if (test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
674 return 0;
675
676 if (hci_register_dev(hdev) < 0) {
677 BT_ERR("Can't register HCI device");
678 hu->proto->close(hu);
679 hu->hdev = NULL;
680 hci_free_dev(hdev);
681 return -ENODEV;
682 }
683
684 set_bit(HCI_UART_REGISTERED, &hu->flags);
685
686 return 0;
687}
688
689static int hci_uart_set_proto(struct hci_uart *hu, int id)
690{
691 const struct hci_uart_proto *p;
692 int err;
693
694 p = hci_uart_get_proto(id);
695 if (!p)
696 return -EPROTONOSUPPORT;
697
698 hu->proto = p;
699
700 err = hci_uart_register_dev(hu);
701 if (err) {
702 return err;
703 }
704
705 set_bit(HCI_UART_PROTO_READY, &hu->flags);
706 return 0;
707}
708
709static int hci_uart_set_flags(struct hci_uart *hu, unsigned long flags)
710{
711 unsigned long valid_flags = BIT(HCI_UART_RAW_DEVICE) |
712 BIT(HCI_UART_RESET_ON_INIT) |
713 BIT(HCI_UART_CREATE_AMP) |
714 BIT(HCI_UART_INIT_PENDING) |
715 BIT(HCI_UART_EXT_CONFIG) |
716 BIT(HCI_UART_VND_DETECT);
717
718 if (flags & ~valid_flags)
719 return -EINVAL;
720
721 hu->hdev_flags = flags;
722
723 return 0;
724}
725
726/* hci_uart_tty_ioctl()
727 *
728 * Process IOCTL system call for the tty device.
729 *
730 * Arguments:
731 *
732 * tty pointer to tty instance data
733 * file pointer to open file object for device
734 * cmd IOCTL command code
735 * arg argument for IOCTL call (cmd dependent)
736 *
737 * Return Value: Command dependent
738 */
739static int hci_uart_tty_ioctl(struct tty_struct *tty, struct file *file,
740 unsigned int cmd, unsigned long arg)
741{
742 struct hci_uart *hu = tty->disc_data;
743 int err = 0;
744
745 BT_DBG("");
746
747 /* Verify the status of the device */
748 if (!hu)
749 return -EBADF;
750
751 switch (cmd) {
752 case HCIUARTSETPROTO:
753 if (!test_and_set_bit(HCI_UART_PROTO_SET, &hu->flags)) {
754 err = hci_uart_set_proto(hu, arg);
755 if (err)
756 clear_bit(HCI_UART_PROTO_SET, &hu->flags);
757 } else
758 err = -EBUSY;
759 break;
760
761 case HCIUARTGETPROTO:
762 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
763 err = hu->proto->id;
764 else
765 err = -EUNATCH;
766 break;
767
768 case HCIUARTGETDEVICE:
769 if (test_bit(HCI_UART_REGISTERED, &hu->flags))
770 err = hu->hdev->id;
771 else
772 err = -EUNATCH;
773 break;
774
775 case HCIUARTSETFLAGS:
776 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
777 err = -EBUSY;
778 else
779 err = hci_uart_set_flags(hu, arg);
780 break;
781
782 case HCIUARTGETFLAGS:
783 err = hu->hdev_flags;
784 break;
785
786 default:
787 err = n_tty_ioctl_helper(tty, file, cmd, arg);
788 break;
789 }
790
791 return err;
792}
793
794/*
795 * We don't provide read/write/poll interface for user space.
796 */
797static ssize_t hci_uart_tty_read(struct tty_struct *tty, struct file *file,
798 unsigned char __user *buf, size_t nr)
799{
800 return 0;
801}
802
803static ssize_t hci_uart_tty_write(struct tty_struct *tty, struct file *file,
804 const unsigned char *data, size_t count)
805{
806 return 0;
807}
808
809static __poll_t hci_uart_tty_poll(struct tty_struct *tty,
810 struct file *filp, poll_table *wait)
811{
812 return 0;
813}
814
815static int __init hci_uart_init(void)
816{
817 static struct tty_ldisc_ops hci_uart_ldisc;
818 int err;
819
820 BT_INFO("HCI UART driver ver %s", VERSION);
821
822 /* Register the tty discipline */
823
824 memset(&hci_uart_ldisc, 0, sizeof(hci_uart_ldisc));
825 hci_uart_ldisc.magic = TTY_LDISC_MAGIC;
826 hci_uart_ldisc.name = "n_hci";
827 hci_uart_ldisc.open = hci_uart_tty_open;
828 hci_uart_ldisc.close = hci_uart_tty_close;
829 hci_uart_ldisc.read = hci_uart_tty_read;
830 hci_uart_ldisc.write = hci_uart_tty_write;
831 hci_uart_ldisc.ioctl = hci_uart_tty_ioctl;
832 hci_uart_ldisc.compat_ioctl = hci_uart_tty_ioctl;
833 hci_uart_ldisc.poll = hci_uart_tty_poll;
834 hci_uart_ldisc.receive_buf = hci_uart_tty_receive;
835 hci_uart_ldisc.write_wakeup = hci_uart_tty_wakeup;
836 hci_uart_ldisc.owner = THIS_MODULE;
837
838 err = tty_register_ldisc(N_HCI, &hci_uart_ldisc);
839 if (err) {
840 BT_ERR("HCI line discipline registration failed. (%d)", err);
841 return err;
842 }
843
844#ifdef CONFIG_BT_HCIUART_H4
845 h4_init();
846#endif
847#ifdef CONFIG_BT_HCIUART_BCSP
848 bcsp_init();
849#endif
850#ifdef CONFIG_BT_HCIUART_LL
851 ll_init();
852#endif
853#ifdef CONFIG_BT_HCIUART_ATH3K
854 ath_init();
855#endif
856#ifdef CONFIG_BT_HCIUART_3WIRE
857 h5_init();
858#endif
859#ifdef CONFIG_BT_HCIUART_INTEL
860 intel_init();
861#endif
862#ifdef CONFIG_BT_HCIUART_BCM
863 bcm_init();
864#endif
865#ifdef CONFIG_BT_HCIUART_QCA
866 qca_init();
867#endif
868#ifdef CONFIG_BT_HCIUART_AG6XX
869 ag6xx_init();
870#endif
871#ifdef CONFIG_BT_HCIUART_MRVL
872 mrvl_init();
873#endif
874
875 return 0;
876}
877
878static void __exit hci_uart_exit(void)
879{
880 int err;
881
882#ifdef CONFIG_BT_HCIUART_H4
883 h4_deinit();
884#endif
885#ifdef CONFIG_BT_HCIUART_BCSP
886 bcsp_deinit();
887#endif
888#ifdef CONFIG_BT_HCIUART_LL
889 ll_deinit();
890#endif
891#ifdef CONFIG_BT_HCIUART_ATH3K
892 ath_deinit();
893#endif
894#ifdef CONFIG_BT_HCIUART_3WIRE
895 h5_deinit();
896#endif
897#ifdef CONFIG_BT_HCIUART_INTEL
898 intel_deinit();
899#endif
900#ifdef CONFIG_BT_HCIUART_BCM
901 bcm_deinit();
902#endif
903#ifdef CONFIG_BT_HCIUART_QCA
904 qca_deinit();
905#endif
906#ifdef CONFIG_BT_HCIUART_AG6XX
907 ag6xx_deinit();
908#endif
909#ifdef CONFIG_BT_HCIUART_MRVL
910 mrvl_deinit();
911#endif
912
913 /* Release tty registration of line discipline */
914 err = tty_unregister_ldisc(N_HCI);
915 if (err)
916 BT_ERR("Can't unregister HCI line discipline (%d)", err);
917}
918
919module_init(hci_uart_init);
920module_exit(hci_uart_exit);
921
922MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
923MODULE_DESCRIPTION("Bluetooth HCI UART driver ver " VERSION);
924MODULE_VERSION(VERSION);
925MODULE_LICENSE("GPL");
926MODULE_ALIAS_LDISC(N_HCI);
927