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	if (!capable(CAP_NET_ADMIN))
483		return -EPERM;
484
485	/* Error if the tty has no write op instead of leaving an exploitable
486	 * hole
487	 */
488	if (tty->ops->write == NULL)
489		return -EOPNOTSUPP;
490
491	hu = kzalloc(sizeof(struct hci_uart), GFP_KERNEL);
492	if (!hu) {
493		BT_ERR("Can't allocate control structure");
494		return -ENFILE;
495	}
496	if (percpu_init_rwsem(&hu->proto_lock)) {
497		BT_ERR("Can't allocate semaphore structure");
498		kfree(hu);
499		return -ENOMEM;
500	}
501
502	tty->disc_data = hu;
503	hu->tty = tty;
504	tty->receive_room = 65536;
505
506	/* disable alignment support by default */
507	hu->alignment = 1;
508	hu->padding = 0;
509
 
 
 
510	INIT_WORK(&hu->init_ready, hci_uart_init_work);
511	INIT_WORK(&hu->write_work, hci_uart_write_work);
512
513	/* Flush any pending characters in the driver */
514	tty_driver_flush_buffer(tty);
515
516	return 0;
517}
518
519/* hci_uart_tty_close()
520 *
521 *    Called when the line discipline is changed to something
522 *    else, the tty is closed, or the tty detects a hangup.
523 */
524static void hci_uart_tty_close(struct tty_struct *tty)
525{
526	struct hci_uart *hu = tty->disc_data;
527	struct hci_dev *hdev;
528
529	BT_DBG("tty %p", tty);
530
531	/* Detach from the tty */
532	tty->disc_data = NULL;
533
534	if (!hu)
535		return;
536
537	hdev = hu->hdev;
538	if (hdev)
539		hci_uart_close(hdev);
540
541	if (test_bit(HCI_UART_PROTO_READY, &hu->flags)) {
542		percpu_down_write(&hu->proto_lock);
543		clear_bit(HCI_UART_PROTO_READY, &hu->flags);
544		percpu_up_write(&hu->proto_lock);
545
546		cancel_work_sync(&hu->init_ready);
547		cancel_work_sync(&hu->write_work);
548
549		if (hdev) {
550			if (test_bit(HCI_UART_REGISTERED, &hu->flags))
551				hci_unregister_dev(hdev);
552			hci_free_dev(hdev);
553		}
554		hu->proto->close(hu);
555	}
556	clear_bit(HCI_UART_PROTO_SET, &hu->flags);
557
558	percpu_free_rwsem(&hu->proto_lock);
559
560	kfree(hu);
561}
562
563/* hci_uart_tty_wakeup()
564 *
565 *    Callback for transmit wakeup. Called when low level
566 *    device driver can accept more send data.
567 *
568 * Arguments:        tty    pointer to associated tty instance data
569 * Return Value:    None
570 */
571static void hci_uart_tty_wakeup(struct tty_struct *tty)
572{
573	struct hci_uart *hu = tty->disc_data;
574
575	BT_DBG("");
576
577	if (!hu)
578		return;
579
580	clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
581
582	if (tty != hu->tty)
583		return;
584
585	if (test_bit(HCI_UART_PROTO_READY, &hu->flags))
586		hci_uart_tx_wakeup(hu);
587}
588
589/* hci_uart_tty_receive()
590 *
591 *     Called by tty low level driver when receive data is
592 *     available.
593 *
594 * Arguments:  tty          pointer to tty isntance data
595 *             data         pointer to received data
596 *             flags        pointer to flags for data
597 *             count        count of received data in bytes
598 *
599 * Return Value:    None
600 */
601static void hci_uart_tty_receive(struct tty_struct *tty, const u8 *data,
602				 const char *flags, int count)
603{
604	struct hci_uart *hu = tty->disc_data;
605
606	if (!hu || tty != hu->tty)
607		return;
608
609	percpu_down_read(&hu->proto_lock);
610
611	if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) {
612		percpu_up_read(&hu->proto_lock);
613		return;
614	}
615
616	/* It does not need a lock here as it is already protected by a mutex in
617	 * tty caller
618	 */
619	hu->proto->recv(hu, data, count);
620	percpu_up_read(&hu->proto_lock);
621
622	if (hu->hdev)
623		hu->hdev->stat.byte_rx += count;
624
625	tty_unthrottle(tty);
626}
627
628static int hci_uart_register_dev(struct hci_uart *hu)
629{
630	struct hci_dev *hdev;
631	int err;
632
633	BT_DBG("");
634
635	/* Initialize and register HCI device */
636	hdev = hci_alloc_dev();
637	if (!hdev) {
638		BT_ERR("Can't allocate HCI device");
639		return -ENOMEM;
640	}
641
642	hu->hdev = hdev;
643
644	hdev->bus = HCI_UART;
645	hci_set_drvdata(hdev, hu);
646
647	/* Only when vendor specific setup callback is provided, consider
648	 * the manufacturer information valid. This avoids filling in the
649	 * value for Ericsson when nothing is specified.
650	 */
651	if (hu->proto->setup)
652		hdev->manufacturer = hu->proto->manufacturer;
653
654	hdev->open  = hci_uart_open;
655	hdev->close = hci_uart_close;
656	hdev->flush = hci_uart_flush;
657	hdev->send  = hci_uart_send_frame;
658	hdev->setup = hci_uart_setup;
659	SET_HCIDEV_DEV(hdev, hu->tty->dev);
660
661	if (test_bit(HCI_UART_RAW_DEVICE, &hu->hdev_flags))
662		set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks);
663
664	if (test_bit(HCI_UART_EXT_CONFIG, &hu->hdev_flags))
665		set_bit(HCI_QUIRK_EXTERNAL_CONFIG, &hdev->quirks);
666
667	if (!test_bit(HCI_UART_RESET_ON_INIT, &hu->hdev_flags))
668		set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);
669
670	if (test_bit(HCI_UART_CREATE_AMP, &hu->hdev_flags))
671		hdev->dev_type = HCI_AMP;
672	else
673		hdev->dev_type = HCI_PRIMARY;
674
675	/* Only call open() for the protocol after hdev is fully initialized as
676	 * open() (or a timer/workqueue it starts) may attempt to reference it.
677	 */
678	err = hu->proto->open(hu);
679	if (err) {
680		hu->hdev = NULL;
681		hci_free_dev(hdev);
682		return err;
683	}
684
685	if (test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
686		return 0;
687
688	if (hci_register_dev(hdev) < 0) {
689		BT_ERR("Can't register HCI device");
690		hu->proto->close(hu);
691		hu->hdev = NULL;
692		hci_free_dev(hdev);
693		return -ENODEV;
694	}
695
696	set_bit(HCI_UART_REGISTERED, &hu->flags);
697
698	return 0;
699}
700
701static int hci_uart_set_proto(struct hci_uart *hu, int id)
702{
703	const struct hci_uart_proto *p;
704	int err;
705
706	p = hci_uart_get_proto(id);
707	if (!p)
708		return -EPROTONOSUPPORT;
709
710	hu->proto = p;
711
712	err = hci_uart_register_dev(hu);
713	if (err) {
714		return err;
715	}
716
717	set_bit(HCI_UART_PROTO_READY, &hu->flags);
718	return 0;
719}
720
721static int hci_uart_set_flags(struct hci_uart *hu, unsigned long flags)
722{
723	unsigned long valid_flags = BIT(HCI_UART_RAW_DEVICE) |
724				    BIT(HCI_UART_RESET_ON_INIT) |
725				    BIT(HCI_UART_CREATE_AMP) |
726				    BIT(HCI_UART_INIT_PENDING) |
727				    BIT(HCI_UART_EXT_CONFIG) |
728				    BIT(HCI_UART_VND_DETECT);
729
730	if (flags & ~valid_flags)
731		return -EINVAL;
732
733	hu->hdev_flags = flags;
734
735	return 0;
736}
737
738/* hci_uart_tty_ioctl()
739 *
740 *    Process IOCTL system call for the tty device.
741 *
742 * Arguments:
743 *
744 *    tty        pointer to tty instance data
745 *    cmd        IOCTL command code
746 *    arg        argument for IOCTL call (cmd dependent)
747 *
748 * Return Value:    Command dependent
749 */
750static int hci_uart_tty_ioctl(struct tty_struct *tty, unsigned int cmd,
751			      unsigned long arg)
752{
753	struct hci_uart *hu = tty->disc_data;
754	int err = 0;
755
756	BT_DBG("");
757
758	/* Verify the status of the device */
759	if (!hu)
760		return -EBADF;
761
762	switch (cmd) {
763	case HCIUARTSETPROTO:
764		if (!test_and_set_bit(HCI_UART_PROTO_SET, &hu->flags)) {
765			err = hci_uart_set_proto(hu, arg);
766			if (err)
767				clear_bit(HCI_UART_PROTO_SET, &hu->flags);
768		} else
769			err = -EBUSY;
770		break;
771
772	case HCIUARTGETPROTO:
773		if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
 
774			err = hu->proto->id;
775		else
776			err = -EUNATCH;
777		break;
778
779	case HCIUARTGETDEVICE:
780		if (test_bit(HCI_UART_REGISTERED, &hu->flags))
781			err = hu->hdev->id;
782		else
783			err = -EUNATCH;
784		break;
785
786	case HCIUARTSETFLAGS:
787		if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
788			err = -EBUSY;
789		else
790			err = hci_uart_set_flags(hu, arg);
791		break;
792
793	case HCIUARTGETFLAGS:
794		err = hu->hdev_flags;
795		break;
796
797	default:
798		err = n_tty_ioctl_helper(tty, cmd, arg);
799		break;
800	}
801
802	return err;
803}
804
805/*
806 * We don't provide read/write/poll interface for user space.
807 */
808static ssize_t hci_uart_tty_read(struct tty_struct *tty, struct file *file,
809				 unsigned char *buf, size_t nr,
810				 void **cookie, unsigned long offset)
811{
812	return 0;
813}
814
815static ssize_t hci_uart_tty_write(struct tty_struct *tty, struct file *file,
816				  const unsigned char *data, size_t count)
817{
818	return 0;
819}
820
821static __poll_t hci_uart_tty_poll(struct tty_struct *tty,
822				      struct file *filp, poll_table *wait)
823{
824	return 0;
825}
826
827static struct tty_ldisc_ops hci_uart_ldisc = {
828	.owner		= THIS_MODULE,
829	.num		= N_HCI,
830	.name		= "n_hci",
831	.open		= hci_uart_tty_open,
832	.close		= hci_uart_tty_close,
833	.read		= hci_uart_tty_read,
834	.write		= hci_uart_tty_write,
835	.ioctl		= hci_uart_tty_ioctl,
836	.compat_ioctl	= hci_uart_tty_ioctl,
837	.poll		= hci_uart_tty_poll,
838	.receive_buf	= hci_uart_tty_receive,
839	.write_wakeup	= hci_uart_tty_wakeup,
840};
841
842static int __init hci_uart_init(void)
843{
844	int err;
845
846	BT_INFO("HCI UART driver ver %s", VERSION);
847
848	/* Register the tty discipline */
849	err = tty_register_ldisc(&hci_uart_ldisc);
850	if (err) {
851		BT_ERR("HCI line discipline registration failed. (%d)", err);
852		return err;
853	}
854
855#ifdef CONFIG_BT_HCIUART_H4
856	h4_init();
857#endif
858#ifdef CONFIG_BT_HCIUART_BCSP
859	bcsp_init();
860#endif
861#ifdef CONFIG_BT_HCIUART_LL
862	ll_init();
863#endif
864#ifdef CONFIG_BT_HCIUART_ATH3K
865	ath_init();
866#endif
867#ifdef CONFIG_BT_HCIUART_3WIRE
868	h5_init();
869#endif
870#ifdef CONFIG_BT_HCIUART_INTEL
871	intel_init();
872#endif
873#ifdef CONFIG_BT_HCIUART_BCM
874	bcm_init();
875#endif
876#ifdef CONFIG_BT_HCIUART_QCA
877	qca_init();
878#endif
879#ifdef CONFIG_BT_HCIUART_AG6XX
880	ag6xx_init();
881#endif
882#ifdef CONFIG_BT_HCIUART_MRVL
883	mrvl_init();
884#endif
885
 
 
886	return 0;
887}
888
889static void __exit hci_uart_exit(void)
890{
891#ifdef CONFIG_BT_HCIUART_H4
892	h4_deinit();
893#endif
894#ifdef CONFIG_BT_HCIUART_BCSP
895	bcsp_deinit();
896#endif
897#ifdef CONFIG_BT_HCIUART_LL
898	ll_deinit();
899#endif
900#ifdef CONFIG_BT_HCIUART_ATH3K
901	ath_deinit();
902#endif
903#ifdef CONFIG_BT_HCIUART_3WIRE
904	h5_deinit();
905#endif
906#ifdef CONFIG_BT_HCIUART_INTEL
907	intel_deinit();
908#endif
909#ifdef CONFIG_BT_HCIUART_BCM
910	bcm_deinit();
911#endif
912#ifdef CONFIG_BT_HCIUART_QCA
913	qca_deinit();
914#endif
915#ifdef CONFIG_BT_HCIUART_AG6XX
916	ag6xx_deinit();
917#endif
918#ifdef CONFIG_BT_HCIUART_MRVL
919	mrvl_deinit();
920#endif
921
 
 
922	tty_unregister_ldisc(&hci_uart_ldisc);
923}
924
925module_init(hci_uart_init);
926module_exit(hci_uart_exit);
927
928MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
929MODULE_DESCRIPTION("Bluetooth HCI UART driver ver " VERSION);
930MODULE_VERSION(VERSION);
931MODULE_LICENSE("GPL");
932MODULE_ALIAS_LDISC(N_HCI);