1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 *
4 *  Bluetooth HCI UART driver
5 *
6 *  Copyright (C) 2000-2001  Qualcomm Incorporated
7 *  Copyright (C) 2002-2003  Maxim Krasnyansky <maxk@qualcomm.com>
8 *  Copyright (C) 2004-2005  Marcel Holtmann <marcel@holtmann.org>
9 */
10
11#include <linux/module.h>
12
13#include <linux/kernel.h>
14#include <linux/init.h>
15#include <linux/types.h>
16#include <linux/fcntl.h>
17#include <linux/interrupt.h>
18#include <linux/ptrace.h>
19#include <linux/poll.h>
20
21#include <linux/slab.h>
22#include <linux/tty.h>
23#include <linux/errno.h>
24#include <linux/string.h>
25#include <linux/signal.h>
26#include <linux/ioctl.h>
27#include <linux/skbuff.h>
28#include <linux/firmware.h>
29#include <linux/serdev.h>
30
31#include <net/bluetooth/bluetooth.h>
32#include <net/bluetooth/hci_core.h>
33
34#include "btintel.h"
35#include "btbcm.h"
36#include "hci_uart.h"
37
38#define VERSION "2.3"
39
40static const struct hci_uart_proto *hup[HCI_UART_MAX_PROTO];
41
42int hci_uart_register_proto(const struct hci_uart_proto *p)
43{
44	if (p->id >= HCI_UART_MAX_PROTO)
45		return -EINVAL;
46
47	if (hup[p->id])
48		return -EEXIST;
49
50	hup[p->id] = p;
51
52	BT_INFO("HCI UART protocol %s registered", p->name);
53
54	return 0;
55}
56
57int hci_uart_unregister_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 -EINVAL;
64
65	hup[p->id] = NULL;
66
67	return 0;
68}
69
70static const struct hci_uart_proto *hci_uart_get_proto(unsigned int id)
71{
72	if (id >= HCI_UART_MAX_PROTO)
73		return NULL;
74
75	return hup[id];
76}
77
78static inline void hci_uart_tx_complete(struct hci_uart *hu, int pkt_type)
79{
80	struct hci_dev *hdev = hu->hdev;
81
82	/* Update HCI stat counters */
83	switch (pkt_type) {
84	case HCI_COMMAND_PKT:
85		hdev->stat.cmd_tx++;
86		break;
87
88	case HCI_ACLDATA_PKT:
89		hdev->stat.acl_tx++;
90		break;
91
92	case HCI_SCODATA_PKT:
93		hdev->stat.sco_tx++;
94		break;
95	}
96}
97
98static inline struct sk_buff *hci_uart_dequeue(struct hci_uart *hu)
99{
100	struct sk_buff *skb = hu->tx_skb;
101
102	if (!skb) {
103		percpu_down_read(&hu->proto_lock);
104
105		if (test_bit(HCI_UART_PROTO_READY, &hu->flags))
106			skb = hu->proto->dequeue(hu);
107
108		percpu_up_read(&hu->proto_lock);
109	} else {
110		hu->tx_skb = NULL;
111	}
112
113	return skb;
114}
115
116int hci_uart_tx_wakeup(struct hci_uart *hu)
117{
118	/* This may be called in an IRQ context, so we can't sleep. Therefore
119	 * we try to acquire the lock only, and if that fails we assume the
120	 * tty is being closed because that is the only time the write lock is
121	 * acquired. If, however, at some point in the future the write lock
122	 * is also acquired in other situations, then this must be revisited.
123	 */
124	if (!percpu_down_read_trylock(&hu->proto_lock))
125		return 0;
126
127	if (!test_bit(HCI_UART_PROTO_READY, &hu->flags))
128		goto no_schedule;
129
130	set_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
131	if (test_and_set_bit(HCI_UART_SENDING, &hu->tx_state))
132		goto no_schedule;
133
134	BT_DBG("");
135
136	schedule_work(&hu->write_work);
137
138no_schedule:
139	percpu_up_read(&hu->proto_lock);
140
141	return 0;
142}
143EXPORT_SYMBOL_GPL(hci_uart_tx_wakeup);
144
145static void hci_uart_write_work(struct work_struct *work)
146{
147	struct hci_uart *hu = container_of(work, struct hci_uart, write_work);
148	struct tty_struct *tty = hu->tty;
149	struct hci_dev *hdev = hu->hdev;
150	struct sk_buff *skb;
151
152	/* REVISIT: should we cope with bad skbs or ->write() returning
153	 * and error value ?
154	 */
155
156restart:
157	clear_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
158
159	while ((skb = hci_uart_dequeue(hu))) {
160		int len;
161
162		set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
163		len = tty->ops->write(tty, skb->data, skb->len);
164		hdev->stat.byte_tx += len;
165
166		skb_pull(skb, len);
167		if (skb->len) {
168			hu->tx_skb = skb;
169			break;
170		}
171
172		hci_uart_tx_complete(hu, hci_skb_pkt_type(skb));
173		kfree_skb(skb);
174	}
175
176	clear_bit(HCI_UART_SENDING, &hu->tx_state);
177	if (test_bit(HCI_UART_TX_WAKEUP, &hu->tx_state))
178		goto restart;
179
180	wake_up_bit(&hu->tx_state, HCI_UART_SENDING);
181}
182
183void hci_uart_init_work(struct work_struct *work)
184{
185	struct hci_uart *hu = container_of(work, struct hci_uart, init_ready);
186	int err;
187	struct hci_dev *hdev;
188
189	if (!test_and_clear_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
190		return;
191
192	err = hci_register_dev(hu->hdev);
193	if (err < 0) {
194		BT_ERR("Can't register HCI device");
195		clear_bit(HCI_UART_PROTO_READY, &hu->flags);
196		hu->proto->close(hu);
197		hdev = hu->hdev;
198		hu->hdev = NULL;
199		hci_free_dev(hdev);
200		return;
201	}
202
203	set_bit(HCI_UART_REGISTERED, &hu->flags);
204}
205
206int hci_uart_init_ready(struct hci_uart *hu)
207{
208	if (!test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
209		return -EALREADY;
210
211	schedule_work(&hu->init_ready);
212
213	return 0;
214}
215
216int hci_uart_wait_until_sent(struct hci_uart *hu)
217{
218	return wait_on_bit_timeout(&hu->tx_state, HCI_UART_SENDING,
219				   TASK_INTERRUPTIBLE,
220				   msecs_to_jiffies(2000));
221}
222
223/* ------- Interface to HCI layer ------ */
224/* Reset device */
225static int hci_uart_flush(struct hci_dev *hdev)
226{
227	struct hci_uart *hu  = hci_get_drvdata(hdev);
228	struct tty_struct *tty = hu->tty;
229
230	BT_DBG("hdev %p tty %p", hdev, tty);
231
232	if (hu->tx_skb) {
233		kfree_skb(hu->tx_skb); hu->tx_skb = NULL;
234	}
235
236	/* Flush any pending characters in the driver and discipline. */
237	tty_ldisc_flush(tty);
238	tty_driver_flush_buffer(tty);
239
240	percpu_down_read(&hu->proto_lock);
241
242	if (test_bit(HCI_UART_PROTO_READY, &hu->flags))
243		hu->proto->flush(hu);
244
245	percpu_up_read(&hu->proto_lock);
246
247	return 0;
248}
249
250/* Initialize device */
251static int hci_uart_open(struct hci_dev *hdev)
252{
253	BT_DBG("%s %p", hdev->name, hdev);
254
255	/* Undo clearing this from hci_uart_close() */
256	hdev->flush = hci_uart_flush;
257
258	return 0;
259}
260
261/* Close device */
262static int hci_uart_close(struct hci_dev *hdev)
263{
264	BT_DBG("hdev %p", hdev);
265
266	hci_uart_flush(hdev);
267	hdev->flush = NULL;
268	return 0;
269}
270
271/* Send frames from HCI layer */
272static int hci_uart_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
273{
274	struct hci_uart *hu = hci_get_drvdata(hdev);
275
276	BT_DBG("%s: type %d len %d", hdev->name, hci_skb_pkt_type(skb),
277	       skb->len);
278
279	percpu_down_read(&hu->proto_lock);
280
281	if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) {
282		percpu_up_read(&hu->proto_lock);
283		return -EUNATCH;
284	}
285
286	hu->proto->enqueue(hu, skb);
287	percpu_up_read(&hu->proto_lock);
288
289	hci_uart_tx_wakeup(hu);
290
291	return 0;
292}
293
294/* Check the underlying device or tty has flow control support */
295bool hci_uart_has_flow_control(struct hci_uart *hu)
296{
297	/* serdev nodes check if the needed operations are present */
298	if (hu->serdev)
299		return true;
300
301	if (hu->tty->driver->ops->tiocmget && hu->tty->driver->ops->tiocmset)
302		return true;
303
304	return false;
305}
306
307/* Flow control or un-flow control the device */
308void hci_uart_set_flow_control(struct hci_uart *hu, bool enable)
309{
310	struct tty_struct *tty = hu->tty;
311	struct ktermios ktermios;
312	int status;
313	unsigned int set = 0;
314	unsigned int clear = 0;
315
316	if (hu->serdev) {
317		serdev_device_set_flow_control(hu->serdev, !enable);
318		serdev_device_set_rts(hu->serdev, !enable);
319		return;
320	}
321
322	if (enable) {
323		/* Disable hardware flow control */
324		ktermios = tty->termios;
325		ktermios.c_cflag &= ~CRTSCTS;
326		status = tty_set_termios(tty, &ktermios);
327		BT_DBG("Disabling hardware flow control: %s",
328		       status ? "failed" : "success");
329
330		/* Clear RTS to prevent the device from sending */
331		/* Most UARTs need OUT2 to enable interrupts */
332		status = tty->driver->ops->tiocmget(tty);
333		BT_DBG("Current tiocm 0x%x", status);
334
335		set &= ~(TIOCM_OUT2 | TIOCM_RTS);
336		clear = ~set;
337		set &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
338		       TIOCM_OUT2 | TIOCM_LOOP;
339		clear &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
340			 TIOCM_OUT2 | TIOCM_LOOP;
341		status = tty->driver->ops->tiocmset(tty, set, clear);
342		BT_DBG("Clearing RTS: %s", status ? "failed" : "success");
343	} else {
344		/* Set RTS to allow the device to send again */
345		status = tty->driver->ops->tiocmget(tty);
346		BT_DBG("Current tiocm 0x%x", status);
347
348		set |= (TIOCM_OUT2 | TIOCM_RTS);
349		clear = ~set;
350		set &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
351		       TIOCM_OUT2 | TIOCM_LOOP;
352		clear &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
353			 TIOCM_OUT2 | TIOCM_LOOP;
354		status = tty->driver->ops->tiocmset(tty, set, clear);
355		BT_DBG("Setting RTS: %s", status ? "failed" : "success");
356
357		/* Re-enable hardware flow control */
358		ktermios = tty->termios;
359		ktermios.c_cflag |= CRTSCTS;
360		status = tty_set_termios(tty, &ktermios);
361		BT_DBG("Enabling hardware flow control: %s",
362		       status ? "failed" : "success");
363	}
364}
365
366void hci_uart_set_speeds(struct hci_uart *hu, unsigned int init_speed,
367			 unsigned int oper_speed)
368{
369	hu->init_speed = init_speed;
370	hu->oper_speed = oper_speed;
371}
372
373void hci_uart_set_baudrate(struct hci_uart *hu, unsigned int speed)
374{
375	struct tty_struct *tty = hu->tty;
376	struct ktermios ktermios;
377
378	ktermios = tty->termios;
379	ktermios.c_cflag &= ~CBAUD;
380	tty_termios_encode_baud_rate(&ktermios, speed, speed);
381
382	/* tty_set_termios() return not checked as it is always 0 */
383	tty_set_termios(tty, &ktermios);
384
385	BT_DBG("%s: New tty speeds: %d/%d", hu->hdev->name,
386	       tty->termios.c_ispeed, tty->termios.c_ospeed);
387}
388
389static int hci_uart_setup(struct hci_dev *hdev)
390{
391	struct hci_uart *hu = hci_get_drvdata(hdev);
392	struct hci_rp_read_local_version *ver;
393	struct sk_buff *skb;
394	unsigned int speed;
395	int err;
396
397	/* Init speed if any */
398	if (hu->init_speed)
399		speed = hu->init_speed;
400	else if (hu->proto->init_speed)
401		speed = hu->proto->init_speed;
402	else
403		speed = 0;
404
405	if (speed)
406		hci_uart_set_baudrate(hu, speed);
407
408	/* Operational speed if any */
409	if (hu->oper_speed)
410		speed = hu->oper_speed;
411	else if (hu->proto->oper_speed)
412		speed = hu->proto->oper_speed;
413	else
414		speed = 0;
415
416	if (hu->proto->set_baudrate && speed) {
417		err = hu->proto->set_baudrate(hu, speed);
418		if (!err)
419			hci_uart_set_baudrate(hu, speed);
420	}
421
422	if (hu->proto->setup)
423		return hu->proto->setup(hu);
424
425	if (!test_bit(HCI_UART_VND_DETECT, &hu->hdev_flags))
426		return 0;
427
428	skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_VERSION, 0, NULL,
429			     HCI_INIT_TIMEOUT);
430	if (IS_ERR(skb)) {
431		BT_ERR("%s: Reading local version information failed (%ld)",
432		       hdev->name, PTR_ERR(skb));
433		return 0;
434	}
435
436	if (skb->len != sizeof(*ver)) {
437		BT_ERR("%s: Event length mismatch for version information",
438		       hdev->name);
439		goto done;
440	}
441
442	ver = (struct hci_rp_read_local_version *)skb->data;
443
444	switch (le16_to_cpu(ver->manufacturer)) {
445#ifdef CONFIG_BT_HCIUART_INTEL
446	case 2:
447		hdev->set_bdaddr = btintel_set_bdaddr;
448		btintel_check_bdaddr(hdev);
449		break;
450#endif
451#ifdef CONFIG_BT_HCIUART_BCM
452	case 15:
453		hdev->set_bdaddr = btbcm_set_bdaddr;
454		btbcm_check_bdaddr(hdev);
455		break;
456#endif
457	default:
458		break;
459	}
460
461done:
462	kfree_skb(skb);
463	return 0;
464}
465
466/* ------ LDISC part ------ */
467/* hci_uart_tty_open
468 *
469 *     Called when line discipline changed to HCI_UART.
470 *
471 * Arguments:
472 *     tty    pointer to tty info structure
473 * Return Value:
474 *     0 if success, otherwise error code
475 */
476static int hci_uart_tty_open(struct tty_struct *tty)
477{
478	struct hci_uart *hu;
479
480	BT_DBG("tty %p", tty);
481
482	/* Error if the tty has no write op instead of leaving an exploitable
483	 * hole
484	 */
485	if (tty->ops->write == NULL)
486		return -EOPNOTSUPP;
487
488	hu = kzalloc(sizeof(struct hci_uart), GFP_KERNEL);
489	if (!hu) {
490		BT_ERR("Can't allocate control structure");
491		return -ENFILE;
492	}
493	if (percpu_init_rwsem(&hu->proto_lock)) {
494		BT_ERR("Can't allocate semaphore structure");
495		kfree(hu);
496		return -ENOMEM;
497	}
498
499	tty->disc_data = hu;
500	hu->tty = tty;
501	tty->receive_room = 65536;
502
503	/* disable alignment support by default */
504	hu->alignment = 1;
505	hu->padding = 0;
506
507	INIT_WORK(&hu->init_ready, hci_uart_init_work);
508	INIT_WORK(&hu->write_work, hci_uart_write_work);
509
510	/* Flush any pending characters in the driver */
511	tty_driver_flush_buffer(tty);
512
513	return 0;
514}
515
516/* hci_uart_tty_close()
517 *
518 *    Called when the line discipline is changed to something
519 *    else, the tty is closed, or the tty detects a hangup.
520 */
521static void hci_uart_tty_close(struct tty_struct *tty)
522{
523	struct hci_uart *hu = tty->disc_data;
524	struct hci_dev *hdev;
525
526	BT_DBG("tty %p", tty);
527
528	/* Detach from the tty */
529	tty->disc_data = NULL;
530
531	if (!hu)
532		return;
533
534	hdev = hu->hdev;
535	if (hdev)
536		hci_uart_close(hdev);
537
538	if (test_bit(HCI_UART_PROTO_READY, &hu->flags)) {
539		percpu_down_write(&hu->proto_lock);
540		clear_bit(HCI_UART_PROTO_READY, &hu->flags);
541		percpu_up_write(&hu->proto_lock);
542
543		cancel_work_sync(&hu->init_ready);
544		cancel_work_sync(&hu->write_work);
545
546		if (hdev) {
547			if (test_bit(HCI_UART_REGISTERED, &hu->flags))
548				hci_unregister_dev(hdev);
549			hci_free_dev(hdev);
550		}
551		hu->proto->close(hu);
552	}
553	clear_bit(HCI_UART_PROTO_SET, &hu->flags);
554
555	percpu_free_rwsem(&hu->proto_lock);
556
557	kfree(hu);
558}
559
560/* hci_uart_tty_wakeup()
561 *
562 *    Callback for transmit wakeup. Called when low level
563 *    device driver can accept more send data.
564 *
565 * Arguments:        tty    pointer to associated tty instance data
566 * Return Value:    None
567 */
568static void hci_uart_tty_wakeup(struct tty_struct *tty)
569{
570	struct hci_uart *hu = tty->disc_data;
571
572	BT_DBG("");
573
574	if (!hu)
575		return;
576
577	clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
578
579	if (tty != hu->tty)
580		return;
581
582	if (test_bit(HCI_UART_PROTO_READY, &hu->flags))
583		hci_uart_tx_wakeup(hu);
584}
585
586/* hci_uart_tty_receive()
587 *
588 *     Called by tty low level driver when receive data is
589 *     available.
590 *
591 * Arguments:  tty          pointer to tty isntance data
592 *             data         pointer to received data
593 *             flags        pointer to flags for data
594 *             count        count of received data in bytes
595 *
596 * Return Value:    None
597 */
598static void hci_uart_tty_receive(struct tty_struct *tty, const u8 *data,
599				 char *flags, int count)
600{
601	struct hci_uart *hu = tty->disc_data;
602
603	if (!hu || tty != hu->tty)
604		return;
605
606	percpu_down_read(&hu->proto_lock);
607
608	if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) {
609		percpu_up_read(&hu->proto_lock);
610		return;
611	}
612
613	/* It does not need a lock here as it is already protected by a mutex in
614	 * tty caller
615	 */
616	hu->proto->recv(hu, data, count);
617	percpu_up_read(&hu->proto_lock);
618
619	if (hu->hdev)
620		hu->hdev->stat.byte_rx += count;
621
622	tty_unthrottle(tty);
623}
624
625static int hci_uart_register_dev(struct hci_uart *hu)
626{
627	struct hci_dev *hdev;
628	int err;
629
630	BT_DBG("");
631
632	/* Initialize and register HCI device */
633	hdev = hci_alloc_dev();
634	if (!hdev) {
635		BT_ERR("Can't allocate HCI device");
636		return -ENOMEM;
637	}
638
639	hu->hdev = hdev;
640
641	hdev->bus = HCI_UART;
642	hci_set_drvdata(hdev, hu);
643
644	/* Only when vendor specific setup callback is provided, consider
645	 * the manufacturer information valid. This avoids filling in the
646	 * value for Ericsson when nothing is specified.
647	 */
648	if (hu->proto->setup)
649		hdev->manufacturer = hu->proto->manufacturer;
650
651	hdev->open  = hci_uart_open;
652	hdev->close = hci_uart_close;
653	hdev->flush = hci_uart_flush;
654	hdev->send  = hci_uart_send_frame;
655	hdev->setup = hci_uart_setup;
656	SET_HCIDEV_DEV(hdev, hu->tty->dev);
657
658	if (test_bit(HCI_UART_RAW_DEVICE, &hu->hdev_flags))
659		set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks);
660
661	if (test_bit(HCI_UART_EXT_CONFIG, &hu->hdev_flags))
662		set_bit(HCI_QUIRK_EXTERNAL_CONFIG, &hdev->quirks);
663
664	if (!test_bit(HCI_UART_RESET_ON_INIT, &hu->hdev_flags))
665		set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);
666
667	if (test_bit(HCI_UART_CREATE_AMP, &hu->hdev_flags))
668		hdev->dev_type = HCI_AMP;
669	else
670		hdev->dev_type = HCI_PRIMARY;
671
672	/* Only call open() for the protocol after hdev is fully initialized as
673	 * open() (or a timer/workqueue it starts) may attempt to reference it.
674	 */
675	err = hu->proto->open(hu);
676	if (err) {
677		hu->hdev = NULL;
678		hci_free_dev(hdev);
679		return err;
680	}
681
682	if (test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
683		return 0;
684
685	if (hci_register_dev(hdev) < 0) {
686		BT_ERR("Can't register HCI device");
687		hu->proto->close(hu);
688		hu->hdev = NULL;
689		hci_free_dev(hdev);
690		return -ENODEV;
691	}
692
693	set_bit(HCI_UART_REGISTERED, &hu->flags);
694
695	return 0;
696}
697
698static int hci_uart_set_proto(struct hci_uart *hu, int id)
699{
700	const struct hci_uart_proto *p;
701	int err;
702
703	p = hci_uart_get_proto(id);
704	if (!p)
705		return -EPROTONOSUPPORT;
706
707	hu->proto = p;
708
709	err = hci_uart_register_dev(hu);
710	if (err) {
711		return err;
712	}
713
714	set_bit(HCI_UART_PROTO_READY, &hu->flags);
715	return 0;
716}
717
718static int hci_uart_set_flags(struct hci_uart *hu, unsigned long flags)
719{
720	unsigned long valid_flags = BIT(HCI_UART_RAW_DEVICE) |
721				    BIT(HCI_UART_RESET_ON_INIT) |
722				    BIT(HCI_UART_CREATE_AMP) |
723				    BIT(HCI_UART_INIT_PENDING) |
724				    BIT(HCI_UART_EXT_CONFIG) |
725				    BIT(HCI_UART_VND_DETECT);
726
727	if (flags & ~valid_flags)
728		return -EINVAL;
729
730	hu->hdev_flags = flags;
731
732	return 0;
733}
734
735/* hci_uart_tty_ioctl()
736 *
737 *    Process IOCTL system call for the tty device.
738 *
739 * Arguments:
740 *
741 *    tty        pointer to tty instance data
742 *    file       pointer to open file object for device
743 *    cmd        IOCTL command code
744 *    arg        argument for IOCTL call (cmd dependent)
745 *
746 * Return Value:    Command dependent
747 */
748static int hci_uart_tty_ioctl(struct tty_struct *tty, struct file *file,
749			      unsigned int cmd, unsigned long arg)
750{
751	struct hci_uart *hu = tty->disc_data;
752	int err = 0;
753
754	BT_DBG("");
755
756	/* Verify the status of the device */
757	if (!hu)
758		return -EBADF;
759
760	switch (cmd) {
761	case HCIUARTSETPROTO:
762		if (!test_and_set_bit(HCI_UART_PROTO_SET, &hu->flags)) {
763			err = hci_uart_set_proto(hu, arg);
764			if (err)
765				clear_bit(HCI_UART_PROTO_SET, &hu->flags);
766		} else
767			err = -EBUSY;
768		break;
769
770	case HCIUARTGETPROTO:
771		if (test_bit(HCI_UART_PROTO_SET, &hu->flags) &&
772		    test_bit(HCI_UART_PROTO_READY, &hu->flags))
773			err = hu->proto->id;
774		else
775			err = -EUNATCH;
776		break;
777
778	case HCIUARTGETDEVICE:
779		if (test_bit(HCI_UART_REGISTERED, &hu->flags))
780			err = hu->hdev->id;
781		else
782			err = -EUNATCH;
783		break;
784
785	case HCIUARTSETFLAGS:
786		if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
787			err = -EBUSY;
788		else
789			err = hci_uart_set_flags(hu, arg);
790		break;
791
792	case HCIUARTGETFLAGS:
793		err = hu->hdev_flags;
794		break;
795
796	default:
797		err = n_tty_ioctl_helper(tty, file, cmd, arg);
798		break;
799	}
800
801	return err;
802}
803
804/*
805 * We don't provide read/write/poll interface for user space.
806 */
807static ssize_t hci_uart_tty_read(struct tty_struct *tty, struct file *file,
808				 unsigned char *buf, size_t nr,
809				 void **cookie, unsigned long offset)
810{
811	return 0;
812}
813
814static ssize_t hci_uart_tty_write(struct tty_struct *tty, struct file *file,
815				  const unsigned char *data, size_t count)
816{
817	return 0;
818}
819
820static __poll_t hci_uart_tty_poll(struct tty_struct *tty,
821				      struct file *filp, poll_table *wait)
822{
823	return 0;
824}
825
826static struct tty_ldisc_ops hci_uart_ldisc = {
827	.owner		= THIS_MODULE,
828	.magic		= TTY_LDISC_MAGIC,
829	.name		= "n_hci",
830	.open		= hci_uart_tty_open,
831	.close		= hci_uart_tty_close,
832	.read		= hci_uart_tty_read,
833	.write		= hci_uart_tty_write,
834	.ioctl		= hci_uart_tty_ioctl,
835	.compat_ioctl	= hci_uart_tty_ioctl,
836	.poll		= hci_uart_tty_poll,
837	.receive_buf	= hci_uart_tty_receive,
838	.write_wakeup	= hci_uart_tty_wakeup,
839};
840
841static int __init hci_uart_init(void)
842{
843	int err;
844
845	BT_INFO("HCI UART driver ver %s", VERSION);
846
847	/* Register the tty discipline */
848	err = tty_register_ldisc(N_HCI, &hci_uart_ldisc);
849	if (err) {
850		BT_ERR("HCI line discipline registration failed. (%d)", err);
851		return err;
852	}
853
854#ifdef CONFIG_BT_HCIUART_H4
855	h4_init();
856#endif
857#ifdef CONFIG_BT_HCIUART_BCSP
858	bcsp_init();
859#endif
860#ifdef CONFIG_BT_HCIUART_LL
861	ll_init();
862#endif
863#ifdef CONFIG_BT_HCIUART_ATH3K
864	ath_init();
865#endif
866#ifdef CONFIG_BT_HCIUART_3WIRE
867	h5_init();
868#endif
869#ifdef CONFIG_BT_HCIUART_INTEL
870	intel_init();
871#endif
872#ifdef CONFIG_BT_HCIUART_BCM
873	bcm_init();
874#endif
875#ifdef CONFIG_BT_HCIUART_QCA
876	qca_init();
877#endif
878#ifdef CONFIG_BT_HCIUART_AG6XX
879	ag6xx_init();
880#endif
881#ifdef CONFIG_BT_HCIUART_MRVL
882	mrvl_init();
883#endif
884
885	return 0;
886}
887
888static void __exit hci_uart_exit(void)
889{
890	int err;
891
892#ifdef CONFIG_BT_HCIUART_H4
893	h4_deinit();
894#endif
895#ifdef CONFIG_BT_HCIUART_BCSP
896	bcsp_deinit();
897#endif
898#ifdef CONFIG_BT_HCIUART_LL
899	ll_deinit();
900#endif
901#ifdef CONFIG_BT_HCIUART_ATH3K
902	ath_deinit();
903#endif
904#ifdef CONFIG_BT_HCIUART_3WIRE
905	h5_deinit();
906#endif
907#ifdef CONFIG_BT_HCIUART_INTEL
908	intel_deinit();
909#endif
910#ifdef CONFIG_BT_HCIUART_BCM
911	bcm_deinit();
912#endif
913#ifdef CONFIG_BT_HCIUART_QCA
914	qca_deinit();
915#endif
916#ifdef CONFIG_BT_HCIUART_AG6XX
917	ag6xx_deinit();
918#endif
919#ifdef CONFIG_BT_HCIUART_MRVL
920	mrvl_deinit();
921#endif
922
923	/* Release tty registration of line discipline */
924	err = tty_unregister_ldisc(N_HCI);
925	if (err)
926		BT_ERR("Can't unregister HCI line discipline (%d)", err);
927}
928
929module_init(hci_uart_init);
930module_exit(hci_uart_exit);
931
932MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
933MODULE_DESCRIPTION("Bluetooth HCI UART driver ver " VERSION);
934MODULE_VERSION(VERSION);
935MODULE_LICENSE("GPL");
936MODULE_ALIAS_LDISC(N_HCI);
937