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
45#include <net/bluetooth/bluetooth.h>
46#include <net/bluetooth/hci_core.h>
47
48#include "btintel.h"
49#include "btbcm.h"
50#include "hci_uart.h"
51
52#define VERSION "2.3"
53
54static const struct hci_uart_proto *hup[HCI_UART_MAX_PROTO];
55
56int hci_uart_register_proto(const struct hci_uart_proto *p)
57{
58	if (p->id >= HCI_UART_MAX_PROTO)
59		return -EINVAL;
60
61	if (hup[p->id])
62		return -EEXIST;
63
64	hup[p->id] = p;
65
66	BT_INFO("HCI UART protocol %s registered", p->name);
67
68	return 0;
69}
70
71int hci_uart_unregister_proto(const struct hci_uart_proto *p)
72{
73	if (p->id >= HCI_UART_MAX_PROTO)
74		return -EINVAL;
75
76	if (!hup[p->id])
77		return -EINVAL;
78
79	hup[p->id] = NULL;
80
81	return 0;
82}
83
84static const struct hci_uart_proto *hci_uart_get_proto(unsigned int id)
85{
86	if (id >= HCI_UART_MAX_PROTO)
87		return NULL;
88
89	return hup[id];
90}
91
92static inline void hci_uart_tx_complete(struct hci_uart *hu, int pkt_type)
93{
94	struct hci_dev *hdev = hu->hdev;
95
96	/* Update HCI stat counters */
97	switch (pkt_type) {
98	case HCI_COMMAND_PKT:
99		hdev->stat.cmd_tx++;
100		break;
101
102	case HCI_ACLDATA_PKT:
103		hdev->stat.acl_tx++;
104		break;
105
106	case HCI_SCODATA_PKT:
107		hdev->stat.sco_tx++;
108		break;
109	}
110}
111
112static inline struct sk_buff *hci_uart_dequeue(struct hci_uart *hu)
113{
114	struct sk_buff *skb = hu->tx_skb;
115
116	if (!skb)
117		skb = hu->proto->dequeue(hu);
118	else
119		hu->tx_skb = NULL;
120
121	return skb;
122}
123
124int hci_uart_tx_wakeup(struct hci_uart *hu)
125{
126	if (test_and_set_bit(HCI_UART_SENDING, &hu->tx_state)) {
127		set_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
128		return 0;
129	}
130
131	BT_DBG("");
132
133	schedule_work(&hu->write_work);
134
135	return 0;
136}
137
138static void hci_uart_write_work(struct work_struct *work)
139{
140	struct hci_uart *hu = container_of(work, struct hci_uart, write_work);
141	struct tty_struct *tty = hu->tty;
142	struct hci_dev *hdev = hu->hdev;
143	struct sk_buff *skb;
144
145	/* REVISIT: should we cope with bad skbs or ->write() returning
146	 * and error value ?
147	 */
148
149restart:
150	clear_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
151
152	while ((skb = hci_uart_dequeue(hu))) {
153		int len;
154
155		set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
156		len = tty->ops->write(tty, skb->data, skb->len);
157		hdev->stat.byte_tx += len;
158
159		skb_pull(skb, len);
160		if (skb->len) {
161			hu->tx_skb = skb;
162			break;
163		}
164
165		hci_uart_tx_complete(hu, bt_cb(skb)->pkt_type);
166		kfree_skb(skb);
167	}
168
169	if (test_bit(HCI_UART_TX_WAKEUP, &hu->tx_state))
170		goto restart;
171
172	clear_bit(HCI_UART_SENDING, &hu->tx_state);
173}
174
175static void hci_uart_init_work(struct work_struct *work)
176{
177	struct hci_uart *hu = container_of(work, struct hci_uart, init_ready);
178	int err;
179
180	if (!test_and_clear_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
181		return;
182
183	err = hci_register_dev(hu->hdev);
184	if (err < 0) {
185		BT_ERR("Can't register HCI device");
186		hci_free_dev(hu->hdev);
187		hu->hdev = NULL;
188		hu->proto->close(hu);
189	}
190
191	set_bit(HCI_UART_REGISTERED, &hu->flags);
192}
193
194int hci_uart_init_ready(struct hci_uart *hu)
195{
196	if (!test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
197		return -EALREADY;
198
199	schedule_work(&hu->init_ready);
200
201	return 0;
202}
203
204/* ------- Interface to HCI layer ------ */
205/* Initialize device */
206static int hci_uart_open(struct hci_dev *hdev)
207{
208	BT_DBG("%s %p", hdev->name, hdev);
209
210	/* Nothing to do for UART driver */
211	return 0;
212}
213
214/* Reset device */
215static int hci_uart_flush(struct hci_dev *hdev)
216{
217	struct hci_uart *hu  = hci_get_drvdata(hdev);
218	struct tty_struct *tty = hu->tty;
219
220	BT_DBG("hdev %p tty %p", hdev, tty);
221
222	if (hu->tx_skb) {
223		kfree_skb(hu->tx_skb); hu->tx_skb = NULL;
224	}
225
226	/* Flush any pending characters in the driver and discipline. */
227	tty_ldisc_flush(tty);
228	tty_driver_flush_buffer(tty);
229
230	if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
231		hu->proto->flush(hu);
232
233	return 0;
234}
235
236/* Close device */
237static int hci_uart_close(struct hci_dev *hdev)
238{
239	BT_DBG("hdev %p", hdev);
240
241	hci_uart_flush(hdev);
242	hdev->flush = NULL;
243	return 0;
244}
245
246/* Send frames from HCI layer */
247static int hci_uart_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
248{
249	struct hci_uart *hu = hci_get_drvdata(hdev);
250
251	BT_DBG("%s: type %d len %d", hdev->name, bt_cb(skb)->pkt_type, skb->len);
252
253	hu->proto->enqueue(hu, skb);
254
255	hci_uart_tx_wakeup(hu);
256
257	return 0;
258}
259
260/* Flow control or un-flow control the device */
261void hci_uart_set_flow_control(struct hci_uart *hu, bool enable)
262{
263	struct tty_struct *tty = hu->tty;
264	struct ktermios ktermios;
265	int status;
266	unsigned int set = 0;
267	unsigned int clear = 0;
268
269	if (enable) {
270		/* Disable hardware flow control */
271		ktermios = tty->termios;
272		ktermios.c_cflag &= ~CRTSCTS;
273		status = tty_set_termios(tty, &ktermios);
274		BT_DBG("Disabling hardware flow control: %s",
275		       status ? "failed" : "success");
276
277		/* Clear RTS to prevent the device from sending */
278		/* Most UARTs need OUT2 to enable interrupts */
279		status = tty->driver->ops->tiocmget(tty);
280		BT_DBG("Current tiocm 0x%x", status);
281
282		set &= ~(TIOCM_OUT2 | TIOCM_RTS);
283		clear = ~set;
284		set &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
285		       TIOCM_OUT2 | TIOCM_LOOP;
286		clear &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
287			 TIOCM_OUT2 | TIOCM_LOOP;
288		status = tty->driver->ops->tiocmset(tty, set, clear);
289		BT_DBG("Clearing RTS: %s", status ? "failed" : "success");
290	} else {
291		/* Set RTS to allow the device to send again */
292		status = tty->driver->ops->tiocmget(tty);
293		BT_DBG("Current tiocm 0x%x", status);
294
295		set |= (TIOCM_OUT2 | TIOCM_RTS);
296		clear = ~set;
297		set &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
298		       TIOCM_OUT2 | TIOCM_LOOP;
299		clear &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
300			 TIOCM_OUT2 | TIOCM_LOOP;
301		status = tty->driver->ops->tiocmset(tty, set, clear);
302		BT_DBG("Setting RTS: %s", status ? "failed" : "success");
303
304		/* Re-enable hardware flow control */
305		ktermios = tty->termios;
306		ktermios.c_cflag |= CRTSCTS;
307		status = tty_set_termios(tty, &ktermios);
308		BT_DBG("Enabling hardware flow control: %s",
309		       status ? "failed" : "success");
310	}
311}
312
313void hci_uart_set_speeds(struct hci_uart *hu, unsigned int init_speed,
314			 unsigned int oper_speed)
315{
316	hu->init_speed = init_speed;
317	hu->oper_speed = oper_speed;
318}
319
320void hci_uart_init_tty(struct hci_uart *hu)
321{
322	struct tty_struct *tty = hu->tty;
323	struct ktermios ktermios;
324
325	/* Bring the UART into a known 8 bits no parity hw fc state */
326	ktermios = tty->termios;
327	ktermios.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP |
328			      INLCR | IGNCR | ICRNL | IXON);
329	ktermios.c_oflag &= ~OPOST;
330	ktermios.c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
331	ktermios.c_cflag &= ~(CSIZE | PARENB);
332	ktermios.c_cflag |= CS8;
333	ktermios.c_cflag |= CRTSCTS;
334
335	/* tty_set_termios() return not checked as it is always 0 */
336	tty_set_termios(tty, &ktermios);
337}
338
339void hci_uart_set_baudrate(struct hci_uart *hu, unsigned int speed)
340{
341	struct tty_struct *tty = hu->tty;
342	struct ktermios ktermios;
343
344	ktermios = tty->termios;
345	ktermios.c_cflag &= ~CBAUD;
346	tty_termios_encode_baud_rate(&ktermios, speed, speed);
347
348	/* tty_set_termios() return not checked as it is always 0 */
349	tty_set_termios(tty, &ktermios);
350
351	BT_DBG("%s: New tty speeds: %d/%d", hu->hdev->name,
352	       tty->termios.c_ispeed, tty->termios.c_ospeed);
353}
354
355static int hci_uart_setup(struct hci_dev *hdev)
356{
357	struct hci_uart *hu = hci_get_drvdata(hdev);
358	struct hci_rp_read_local_version *ver;
359	struct sk_buff *skb;
360	unsigned int speed;
361	int err;
362
363	/* Init speed if any */
364	if (hu->init_speed)
365		speed = hu->init_speed;
366	else if (hu->proto->init_speed)
367		speed = hu->proto->init_speed;
368	else
369		speed = 0;
370
371	if (speed)
372		hci_uart_set_baudrate(hu, speed);
373
374	/* Operational speed if any */
375	if (hu->oper_speed)
376		speed = hu->oper_speed;
377	else if (hu->proto->oper_speed)
378		speed = hu->proto->oper_speed;
379	else
380		speed = 0;
381
382	if (hu->proto->set_baudrate && speed) {
383		err = hu->proto->set_baudrate(hu, speed);
384		if (!err)
385			hci_uart_set_baudrate(hu, speed);
386	}
387
388	if (hu->proto->setup)
389		return hu->proto->setup(hu);
390
391	if (!test_bit(HCI_UART_VND_DETECT, &hu->hdev_flags))
392		return 0;
393
394	skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_VERSION, 0, NULL,
395			     HCI_INIT_TIMEOUT);
396	if (IS_ERR(skb)) {
397		BT_ERR("%s: Reading local version information failed (%ld)",
398		       hdev->name, PTR_ERR(skb));
399		return 0;
400	}
401
402	if (skb->len != sizeof(*ver)) {
403		BT_ERR("%s: Event length mismatch for version information",
404		       hdev->name);
405		goto done;
406	}
407
408	ver = (struct hci_rp_read_local_version *)skb->data;
409
410	switch (le16_to_cpu(ver->manufacturer)) {
411#ifdef CONFIG_BT_HCIUART_INTEL
412	case 2:
413		hdev->set_bdaddr = btintel_set_bdaddr;
414		btintel_check_bdaddr(hdev);
415		break;
416#endif
417#ifdef CONFIG_BT_HCIUART_BCM
418	case 15:
419		hdev->set_bdaddr = btbcm_set_bdaddr;
420		btbcm_check_bdaddr(hdev);
421		break;
422#endif
423	}
424
425done:
426	kfree_skb(skb);
427	return 0;
428}
429
430/* ------ LDISC part ------ */
431/* hci_uart_tty_open
432 *
433 *     Called when line discipline changed to HCI_UART.
434 *
435 * Arguments:
436 *     tty    pointer to tty info structure
437 * Return Value:
438 *     0 if success, otherwise error code
439 */
440static int hci_uart_tty_open(struct tty_struct *tty)
441{
442	struct hci_uart *hu;
443
444	BT_DBG("tty %p", tty);
445
446	/* Error if the tty has no write op instead of leaving an exploitable
447	   hole */
448	if (tty->ops->write == NULL)
449		return -EOPNOTSUPP;
450
451	hu = kzalloc(sizeof(struct hci_uart), GFP_KERNEL);
452	if (!hu) {
453		BT_ERR("Can't allocate control structure");
454		return -ENFILE;
455	}
456
457	tty->disc_data = hu;
458	hu->tty = tty;
459	tty->receive_room = 65536;
460
461	INIT_WORK(&hu->init_ready, hci_uart_init_work);
462	INIT_WORK(&hu->write_work, hci_uart_write_work);
463
464	/* Flush any pending characters in the driver and line discipline. */
465
466	/* FIXME: why is this needed. Note don't use ldisc_ref here as the
467	   open path is before the ldisc is referencable */
468
469	if (tty->ldisc->ops->flush_buffer)
470		tty->ldisc->ops->flush_buffer(tty);
471	tty_driver_flush_buffer(tty);
472
473	return 0;
474}
475
476/* hci_uart_tty_close()
477 *
478 *    Called when the line discipline is changed to something
479 *    else, the tty is closed, or the tty detects a hangup.
480 */
481static void hci_uart_tty_close(struct tty_struct *tty)
482{
483	struct hci_uart *hu = tty->disc_data;
484	struct hci_dev *hdev;
485
486	BT_DBG("tty %p", tty);
487
488	/* Detach from the tty */
489	tty->disc_data = NULL;
490
491	if (!hu)
492		return;
493
494	hdev = hu->hdev;
495	if (hdev)
496		hci_uart_close(hdev);
497
498	cancel_work_sync(&hu->write_work);
499
500	if (test_and_clear_bit(HCI_UART_PROTO_SET, &hu->flags)) {
501		if (hdev) {
502			if (test_bit(HCI_UART_REGISTERED, &hu->flags))
503				hci_unregister_dev(hdev);
504			hci_free_dev(hdev);
505		}
506		hu->proto->close(hu);
507	}
508
509	kfree(hu);
510}
511
512/* hci_uart_tty_wakeup()
513 *
514 *    Callback for transmit wakeup. Called when low level
515 *    device driver can accept more send data.
516 *
517 * Arguments:        tty    pointer to associated tty instance data
518 * Return Value:    None
519 */
520static void hci_uart_tty_wakeup(struct tty_struct *tty)
521{
522	struct hci_uart *hu = tty->disc_data;
523
524	BT_DBG("");
525
526	if (!hu)
527		return;
528
529	clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
530
531	if (tty != hu->tty)
532		return;
533
534	if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
535		hci_uart_tx_wakeup(hu);
536}
537
538/* hci_uart_tty_receive()
539 *
540 *     Called by tty low level driver when receive data is
541 *     available.
542 *
543 * Arguments:  tty          pointer to tty isntance data
544 *             data         pointer to received data
545 *             flags        pointer to flags for data
546 *             count        count of received data in bytes
547 *
548 * Return Value:    None
549 */
550static void hci_uart_tty_receive(struct tty_struct *tty, const u8 *data,
551				 char *flags, int count)
552{
553	struct hci_uart *hu = tty->disc_data;
554
555	if (!hu || tty != hu->tty)
556		return;
557
558	if (!test_bit(HCI_UART_PROTO_SET, &hu->flags))
559		return;
560
561	/* It does not need a lock here as it is already protected by a mutex in
562	 * tty caller
563	 */
564	hu->proto->recv(hu, data, count);
565
566	if (hu->hdev)
567		hu->hdev->stat.byte_rx += count;
568
569	tty_unthrottle(tty);
570}
571
572static int hci_uart_register_dev(struct hci_uart *hu)
573{
574	struct hci_dev *hdev;
575
576	BT_DBG("");
577
578	/* Initialize and register HCI device */
579	hdev = hci_alloc_dev();
580	if (!hdev) {
581		BT_ERR("Can't allocate HCI device");
582		return -ENOMEM;
583	}
584
585	hu->hdev = hdev;
586
587	hdev->bus = HCI_UART;
588	hci_set_drvdata(hdev, hu);
589
590	/* Only when vendor specific setup callback is provided, consider
591	 * the manufacturer information valid. This avoids filling in the
592	 * value for Ericsson when nothing is specified.
593	 */
594	if (hu->proto->setup)
595		hdev->manufacturer = hu->proto->manufacturer;
596
597	hdev->open  = hci_uart_open;
598	hdev->close = hci_uart_close;
599	hdev->flush = hci_uart_flush;
600	hdev->send  = hci_uart_send_frame;
601	hdev->setup = hci_uart_setup;
602	SET_HCIDEV_DEV(hdev, hu->tty->dev);
603
604	if (test_bit(HCI_UART_RAW_DEVICE, &hu->hdev_flags))
605		set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks);
606
607	if (test_bit(HCI_UART_EXT_CONFIG, &hu->hdev_flags))
608		set_bit(HCI_QUIRK_EXTERNAL_CONFIG, &hdev->quirks);
609
610	if (!test_bit(HCI_UART_RESET_ON_INIT, &hu->hdev_flags))
611		set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);
612
613	if (test_bit(HCI_UART_CREATE_AMP, &hu->hdev_flags))
614		hdev->dev_type = HCI_AMP;
615	else
616		hdev->dev_type = HCI_BREDR;
617
618	if (test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
619		return 0;
620
621	if (hci_register_dev(hdev) < 0) {
622		BT_ERR("Can't register HCI device");
623		hci_free_dev(hdev);
624		return -ENODEV;
625	}
626
627	set_bit(HCI_UART_REGISTERED, &hu->flags);
628
629	return 0;
630}
631
632static int hci_uart_set_proto(struct hci_uart *hu, int id)
633{
634	const struct hci_uart_proto *p;
635	int err;
636
637	p = hci_uart_get_proto(id);
638	if (!p)
639		return -EPROTONOSUPPORT;
640
641	err = p->open(hu);
642	if (err)
643		return err;
644
645	hu->proto = p;
646
647	err = hci_uart_register_dev(hu);
648	if (err) {
649		p->close(hu);
650		return err;
651	}
652
653	return 0;
654}
655
656static int hci_uart_set_flags(struct hci_uart *hu, unsigned long flags)
657{
658	unsigned long valid_flags = BIT(HCI_UART_RAW_DEVICE) |
659				    BIT(HCI_UART_RESET_ON_INIT) |
660				    BIT(HCI_UART_CREATE_AMP) |
661				    BIT(HCI_UART_INIT_PENDING) |
662				    BIT(HCI_UART_EXT_CONFIG) |
663				    BIT(HCI_UART_VND_DETECT);
664
665	if (flags & ~valid_flags)
666		return -EINVAL;
667
668	hu->hdev_flags = flags;
669
670	return 0;
671}
672
673/* hci_uart_tty_ioctl()
674 *
675 *    Process IOCTL system call for the tty device.
676 *
677 * Arguments:
678 *
679 *    tty        pointer to tty instance data
680 *    file       pointer to open file object for device
681 *    cmd        IOCTL command code
682 *    arg        argument for IOCTL call (cmd dependent)
683 *
684 * Return Value:    Command dependent
685 */
686static int hci_uart_tty_ioctl(struct tty_struct *tty, struct file *file,
687			      unsigned int cmd, unsigned long arg)
688{
689	struct hci_uart *hu = tty->disc_data;
690	int err = 0;
691
692	BT_DBG("");
693
694	/* Verify the status of the device */
695	if (!hu)
696		return -EBADF;
697
698	switch (cmd) {
699	case HCIUARTSETPROTO:
700		if (!test_and_set_bit(HCI_UART_PROTO_SET, &hu->flags)) {
701			err = hci_uart_set_proto(hu, arg);
702			if (err) {
703				clear_bit(HCI_UART_PROTO_SET, &hu->flags);
704				return err;
705			}
706		} else
707			return -EBUSY;
708		break;
709
710	case HCIUARTGETPROTO:
711		if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
712			return hu->proto->id;
713		return -EUNATCH;
714
715	case HCIUARTGETDEVICE:
716		if (test_bit(HCI_UART_REGISTERED, &hu->flags))
717			return hu->hdev->id;
718		return -EUNATCH;
719
720	case HCIUARTSETFLAGS:
721		if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
722			return -EBUSY;
723		err = hci_uart_set_flags(hu, arg);
724		if (err)
725			return err;
726		break;
727
728	case HCIUARTGETFLAGS:
729		return hu->hdev_flags;
730
731	default:
732		err = n_tty_ioctl_helper(tty, file, cmd, arg);
733		break;
734	}
735
736	return err;
737}
738
739/*
740 * We don't provide read/write/poll interface for user space.
741 */
742static ssize_t hci_uart_tty_read(struct tty_struct *tty, struct file *file,
743				 unsigned char __user *buf, size_t nr)
744{
745	return 0;
746}
747
748static ssize_t hci_uart_tty_write(struct tty_struct *tty, struct file *file,
749				  const unsigned char *data, size_t count)
750{
751	return 0;
752}
753
754static unsigned int hci_uart_tty_poll(struct tty_struct *tty,
755				      struct file *filp, poll_table *wait)
756{
757	return 0;
758}
759
760static int __init hci_uart_init(void)
761{
762	static struct tty_ldisc_ops hci_uart_ldisc;
763	int err;
764
765	BT_INFO("HCI UART driver ver %s", VERSION);
766
767	/* Register the tty discipline */
768
769	memset(&hci_uart_ldisc, 0, sizeof(hci_uart_ldisc));
770	hci_uart_ldisc.magic		= TTY_LDISC_MAGIC;
771	hci_uart_ldisc.name		= "n_hci";
772	hci_uart_ldisc.open		= hci_uart_tty_open;
773	hci_uart_ldisc.close		= hci_uart_tty_close;
774	hci_uart_ldisc.read		= hci_uart_tty_read;
775	hci_uart_ldisc.write		= hci_uart_tty_write;
776	hci_uart_ldisc.ioctl		= hci_uart_tty_ioctl;
777	hci_uart_ldisc.poll		= hci_uart_tty_poll;
778	hci_uart_ldisc.receive_buf	= hci_uart_tty_receive;
779	hci_uart_ldisc.write_wakeup	= hci_uart_tty_wakeup;
780	hci_uart_ldisc.owner		= THIS_MODULE;
781
782	err = tty_register_ldisc(N_HCI, &hci_uart_ldisc);
783	if (err) {
784		BT_ERR("HCI line discipline registration failed. (%d)", err);
785		return err;
786	}
787
788#ifdef CONFIG_BT_HCIUART_H4
789	h4_init();
790#endif
791#ifdef CONFIG_BT_HCIUART_BCSP
792	bcsp_init();
793#endif
794#ifdef CONFIG_BT_HCIUART_LL
795	ll_init();
796#endif
797#ifdef CONFIG_BT_HCIUART_ATH3K
798	ath_init();
799#endif
800#ifdef CONFIG_BT_HCIUART_3WIRE
801	h5_init();
802#endif
803#ifdef CONFIG_BT_HCIUART_INTEL
804	intel_init();
805#endif
806#ifdef CONFIG_BT_HCIUART_BCM
807	bcm_init();
808#endif
809#ifdef CONFIG_BT_HCIUART_QCA
810	qca_init();
811#endif
812
813	return 0;
814}
815
816static void __exit hci_uart_exit(void)
817{
818	int err;
819
820#ifdef CONFIG_BT_HCIUART_H4
821	h4_deinit();
822#endif
823#ifdef CONFIG_BT_HCIUART_BCSP
824	bcsp_deinit();
825#endif
826#ifdef CONFIG_BT_HCIUART_LL
827	ll_deinit();
828#endif
829#ifdef CONFIG_BT_HCIUART_ATH3K
830	ath_deinit();
831#endif
832#ifdef CONFIG_BT_HCIUART_3WIRE
833	h5_deinit();
834#endif
835#ifdef CONFIG_BT_HCIUART_INTEL
836	intel_deinit();
837#endif
838#ifdef CONFIG_BT_HCIUART_BCM
839	bcm_deinit();
840#endif
841#ifdef CONFIG_BT_HCIUART_QCA
842	qca_deinit();
843#endif
844
845	/* Release tty registration of line discipline */
846	err = tty_unregister_ldisc(N_HCI);
847	if (err)
848		BT_ERR("Can't unregister HCI line discipline (%d)", err);
849}
850
851module_init(hci_uart_init);
852module_exit(hci_uart_exit);
853
854MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
855MODULE_DESCRIPTION("Bluetooth HCI UART driver ver " VERSION);
856MODULE_VERSION(VERSION);
857MODULE_LICENSE("GPL");
858MODULE_ALIAS_LDISC(N_HCI);
859