Loading...
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);
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
198static 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
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/* Initialize device */
233static int hci_uart_open(struct hci_dev *hdev)
234{
235 BT_DBG("%s %p", hdev->name, hdev);
236
237 /* Nothing to do for UART driver */
238 return 0;
239}
240
241/* Reset device */
242static int hci_uart_flush(struct hci_dev *hdev)
243{
244 struct hci_uart *hu = hci_get_drvdata(hdev);
245 struct tty_struct *tty = hu->tty;
246
247 BT_DBG("hdev %p tty %p", hdev, tty);
248
249 if (hu->tx_skb) {
250 kfree_skb(hu->tx_skb); hu->tx_skb = NULL;
251 }
252
253 /* Flush any pending characters in the driver and discipline. */
254 tty_ldisc_flush(tty);
255 tty_driver_flush_buffer(tty);
256
257 percpu_down_read(&hu->proto_lock);
258
259 if (test_bit(HCI_UART_PROTO_READY, &hu->flags))
260 hu->proto->flush(hu);
261
262 percpu_up_read(&hu->proto_lock);
263
264 return 0;
265}
266
267/* Close device */
268static int hci_uart_close(struct hci_dev *hdev)
269{
270 BT_DBG("hdev %p", hdev);
271
272 hci_uart_flush(hdev);
273 hdev->flush = NULL;
274 return 0;
275}
276
277/* Send frames from HCI layer */
278static int hci_uart_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
279{
280 struct hci_uart *hu = hci_get_drvdata(hdev);
281
282 BT_DBG("%s: type %d len %d", hdev->name, hci_skb_pkt_type(skb),
283 skb->len);
284
285 percpu_down_read(&hu->proto_lock);
286
287 if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) {
288 percpu_up_read(&hu->proto_lock);
289 return -EUNATCH;
290 }
291
292 hu->proto->enqueue(hu, skb);
293 percpu_up_read(&hu->proto_lock);
294
295 hci_uart_tx_wakeup(hu);
296
297 return 0;
298}
299
300/* Flow control or un-flow control the device */
301void hci_uart_set_flow_control(struct hci_uart *hu, bool enable)
302{
303 struct tty_struct *tty = hu->tty;
304 struct ktermios ktermios;
305 int status;
306 unsigned int set = 0;
307 unsigned int clear = 0;
308
309 if (hu->serdev) {
310 serdev_device_set_flow_control(hu->serdev, !enable);
311 serdev_device_set_rts(hu->serdev, !enable);
312 return;
313 }
314
315 if (enable) {
316 /* Disable hardware flow control */
317 ktermios = tty->termios;
318 ktermios.c_cflag &= ~CRTSCTS;
319 status = tty_set_termios(tty, &ktermios);
320 BT_DBG("Disabling hardware flow control: %s",
321 status ? "failed" : "success");
322
323 /* Clear RTS to prevent the device from sending */
324 /* Most UARTs need OUT2 to enable interrupts */
325 status = tty->driver->ops->tiocmget(tty);
326 BT_DBG("Current tiocm 0x%x", status);
327
328 set &= ~(TIOCM_OUT2 | TIOCM_RTS);
329 clear = ~set;
330 set &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
331 TIOCM_OUT2 | TIOCM_LOOP;
332 clear &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
333 TIOCM_OUT2 | TIOCM_LOOP;
334 status = tty->driver->ops->tiocmset(tty, set, clear);
335 BT_DBG("Clearing RTS: %s", status ? "failed" : "success");
336 } else {
337 /* Set RTS to allow the device to send again */
338 status = tty->driver->ops->tiocmget(tty);
339 BT_DBG("Current tiocm 0x%x", status);
340
341 set |= (TIOCM_OUT2 | TIOCM_RTS);
342 clear = ~set;
343 set &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
344 TIOCM_OUT2 | TIOCM_LOOP;
345 clear &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
346 TIOCM_OUT2 | TIOCM_LOOP;
347 status = tty->driver->ops->tiocmset(tty, set, clear);
348 BT_DBG("Setting RTS: %s", status ? "failed" : "success");
349
350 /* Re-enable hardware flow control */
351 ktermios = tty->termios;
352 ktermios.c_cflag |= CRTSCTS;
353 status = tty_set_termios(tty, &ktermios);
354 BT_DBG("Enabling hardware flow control: %s",
355 status ? "failed" : "success");
356 }
357}
358
359void hci_uart_set_speeds(struct hci_uart *hu, unsigned int init_speed,
360 unsigned int oper_speed)
361{
362 hu->init_speed = init_speed;
363 hu->oper_speed = oper_speed;
364}
365
366void hci_uart_set_baudrate(struct hci_uart *hu, unsigned int speed)
367{
368 struct tty_struct *tty = hu->tty;
369 struct ktermios ktermios;
370
371 ktermios = tty->termios;
372 ktermios.c_cflag &= ~CBAUD;
373 tty_termios_encode_baud_rate(&ktermios, speed, speed);
374
375 /* tty_set_termios() return not checked as it is always 0 */
376 tty_set_termios(tty, &ktermios);
377
378 BT_DBG("%s: New tty speeds: %d/%d", hu->hdev->name,
379 tty->termios.c_ispeed, tty->termios.c_ospeed);
380}
381
382static int hci_uart_setup(struct hci_dev *hdev)
383{
384 struct hci_uart *hu = hci_get_drvdata(hdev);
385 struct hci_rp_read_local_version *ver;
386 struct sk_buff *skb;
387 unsigned int speed;
388 int err;
389
390 /* Init speed if any */
391 if (hu->init_speed)
392 speed = hu->init_speed;
393 else if (hu->proto->init_speed)
394 speed = hu->proto->init_speed;
395 else
396 speed = 0;
397
398 if (speed)
399 hci_uart_set_baudrate(hu, speed);
400
401 /* Operational speed if any */
402 if (hu->oper_speed)
403 speed = hu->oper_speed;
404 else if (hu->proto->oper_speed)
405 speed = hu->proto->oper_speed;
406 else
407 speed = 0;
408
409 if (hu->proto->set_baudrate && speed) {
410 err = hu->proto->set_baudrate(hu, speed);
411 if (!err)
412 hci_uart_set_baudrate(hu, speed);
413 }
414
415 if (hu->proto->setup)
416 return hu->proto->setup(hu);
417
418 if (!test_bit(HCI_UART_VND_DETECT, &hu->hdev_flags))
419 return 0;
420
421 skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_VERSION, 0, NULL,
422 HCI_INIT_TIMEOUT);
423 if (IS_ERR(skb)) {
424 BT_ERR("%s: Reading local version information failed (%ld)",
425 hdev->name, PTR_ERR(skb));
426 return 0;
427 }
428
429 if (skb->len != sizeof(*ver)) {
430 BT_ERR("%s: Event length mismatch for version information",
431 hdev->name);
432 goto done;
433 }
434
435 ver = (struct hci_rp_read_local_version *)skb->data;
436
437 switch (le16_to_cpu(ver->manufacturer)) {
438#ifdef CONFIG_BT_HCIUART_INTEL
439 case 2:
440 hdev->set_bdaddr = btintel_set_bdaddr;
441 btintel_check_bdaddr(hdev);
442 break;
443#endif
444#ifdef CONFIG_BT_HCIUART_BCM
445 case 15:
446 hdev->set_bdaddr = btbcm_set_bdaddr;
447 btbcm_check_bdaddr(hdev);
448 break;
449#endif
450 }
451
452done:
453 kfree_skb(skb);
454 return 0;
455}
456
457/* ------ LDISC part ------ */
458/* hci_uart_tty_open
459 *
460 * Called when line discipline changed to HCI_UART.
461 *
462 * Arguments:
463 * tty pointer to tty info structure
464 * Return Value:
465 * 0 if success, otherwise error code
466 */
467static int hci_uart_tty_open(struct tty_struct *tty)
468{
469 struct hci_uart *hu;
470
471 BT_DBG("tty %p", tty);
472
473 /* Error if the tty has no write op instead of leaving an exploitable
474 * hole
475 */
476 if (tty->ops->write == NULL)
477 return -EOPNOTSUPP;
478
479 hu = kzalloc(sizeof(struct hci_uart), GFP_KERNEL);
480 if (!hu) {
481 BT_ERR("Can't allocate control structure");
482 return -ENFILE;
483 }
484
485 tty->disc_data = hu;
486 hu->tty = tty;
487 tty->receive_room = 65536;
488
489 /* disable alignment support by default */
490 hu->alignment = 1;
491 hu->padding = 0;
492
493 INIT_WORK(&hu->init_ready, hci_uart_init_work);
494 INIT_WORK(&hu->write_work, hci_uart_write_work);
495
496 percpu_init_rwsem(&hu->proto_lock);
497
498 /* Flush any pending characters in the driver */
499 tty_driver_flush_buffer(tty);
500
501 return 0;
502}
503
504/* hci_uart_tty_close()
505 *
506 * Called when the line discipline is changed to something
507 * else, the tty is closed, or the tty detects a hangup.
508 */
509static void hci_uart_tty_close(struct tty_struct *tty)
510{
511 struct hci_uart *hu = tty->disc_data;
512 struct hci_dev *hdev;
513
514 BT_DBG("tty %p", tty);
515
516 /* Detach from the tty */
517 tty->disc_data = NULL;
518
519 if (!hu)
520 return;
521
522 hdev = hu->hdev;
523 if (hdev)
524 hci_uart_close(hdev);
525
526 if (test_bit(HCI_UART_PROTO_READY, &hu->flags)) {
527 percpu_down_write(&hu->proto_lock);
528 clear_bit(HCI_UART_PROTO_READY, &hu->flags);
529 percpu_up_write(&hu->proto_lock);
530
531 cancel_work_sync(&hu->write_work);
532
533 if (hdev) {
534 if (test_bit(HCI_UART_REGISTERED, &hu->flags))
535 hci_unregister_dev(hdev);
536 hci_free_dev(hdev);
537 }
538 hu->proto->close(hu);
539 }
540 clear_bit(HCI_UART_PROTO_SET, &hu->flags);
541
542 kfree(hu);
543}
544
545/* hci_uart_tty_wakeup()
546 *
547 * Callback for transmit wakeup. Called when low level
548 * device driver can accept more send data.
549 *
550 * Arguments: tty pointer to associated tty instance data
551 * Return Value: None
552 */
553static void hci_uart_tty_wakeup(struct tty_struct *tty)
554{
555 struct hci_uart *hu = tty->disc_data;
556
557 BT_DBG("");
558
559 if (!hu)
560 return;
561
562 clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
563
564 if (tty != hu->tty)
565 return;
566
567 if (test_bit(HCI_UART_PROTO_READY, &hu->flags))
568 hci_uart_tx_wakeup(hu);
569}
570
571/* hci_uart_tty_receive()
572 *
573 * Called by tty low level driver when receive data is
574 * available.
575 *
576 * Arguments: tty pointer to tty isntance data
577 * data pointer to received data
578 * flags pointer to flags for data
579 * count count of received data in bytes
580 *
581 * Return Value: None
582 */
583static void hci_uart_tty_receive(struct tty_struct *tty, const u8 *data,
584 char *flags, int count)
585{
586 struct hci_uart *hu = tty->disc_data;
587
588 if (!hu || tty != hu->tty)
589 return;
590
591 percpu_down_read(&hu->proto_lock);
592
593 if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) {
594 percpu_up_read(&hu->proto_lock);
595 return;
596 }
597
598 /* It does not need a lock here as it is already protected by a mutex in
599 * tty caller
600 */
601 hu->proto->recv(hu, data, count);
602 percpu_up_read(&hu->proto_lock);
603
604 if (hu->hdev)
605 hu->hdev->stat.byte_rx += count;
606
607 tty_unthrottle(tty);
608}
609
610static int hci_uart_register_dev(struct hci_uart *hu)
611{
612 struct hci_dev *hdev;
613
614 BT_DBG("");
615
616 /* Initialize and register HCI device */
617 hdev = hci_alloc_dev();
618 if (!hdev) {
619 BT_ERR("Can't allocate HCI device");
620 return -ENOMEM;
621 }
622
623 hu->hdev = hdev;
624
625 hdev->bus = HCI_UART;
626 hci_set_drvdata(hdev, hu);
627
628 /* Only when vendor specific setup callback is provided, consider
629 * the manufacturer information valid. This avoids filling in the
630 * value for Ericsson when nothing is specified.
631 */
632 if (hu->proto->setup)
633 hdev->manufacturer = hu->proto->manufacturer;
634
635 hdev->open = hci_uart_open;
636 hdev->close = hci_uart_close;
637 hdev->flush = hci_uart_flush;
638 hdev->send = hci_uart_send_frame;
639 hdev->setup = hci_uart_setup;
640 SET_HCIDEV_DEV(hdev, hu->tty->dev);
641
642 if (test_bit(HCI_UART_RAW_DEVICE, &hu->hdev_flags))
643 set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks);
644
645 if (test_bit(HCI_UART_EXT_CONFIG, &hu->hdev_flags))
646 set_bit(HCI_QUIRK_EXTERNAL_CONFIG, &hdev->quirks);
647
648 if (!test_bit(HCI_UART_RESET_ON_INIT, &hu->hdev_flags))
649 set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);
650
651 if (test_bit(HCI_UART_CREATE_AMP, &hu->hdev_flags))
652 hdev->dev_type = HCI_AMP;
653 else
654 hdev->dev_type = HCI_PRIMARY;
655
656 if (test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
657 return 0;
658
659 if (hci_register_dev(hdev) < 0) {
660 BT_ERR("Can't register HCI device");
661 hu->hdev = NULL;
662 hci_free_dev(hdev);
663 return -ENODEV;
664 }
665
666 set_bit(HCI_UART_REGISTERED, &hu->flags);
667
668 return 0;
669}
670
671static int hci_uart_set_proto(struct hci_uart *hu, int id)
672{
673 const struct hci_uart_proto *p;
674 int err;
675
676 p = hci_uart_get_proto(id);
677 if (!p)
678 return -EPROTONOSUPPORT;
679
680 err = p->open(hu);
681 if (err)
682 return err;
683
684 hu->proto = p;
685 set_bit(HCI_UART_PROTO_READY, &hu->flags);
686
687 err = hci_uart_register_dev(hu);
688 if (err) {
689 clear_bit(HCI_UART_PROTO_READY, &hu->flags);
690 p->close(hu);
691 return err;
692 }
693
694 return 0;
695}
696
697static int hci_uart_set_flags(struct hci_uart *hu, unsigned long flags)
698{
699 unsigned long valid_flags = BIT(HCI_UART_RAW_DEVICE) |
700 BIT(HCI_UART_RESET_ON_INIT) |
701 BIT(HCI_UART_CREATE_AMP) |
702 BIT(HCI_UART_INIT_PENDING) |
703 BIT(HCI_UART_EXT_CONFIG) |
704 BIT(HCI_UART_VND_DETECT);
705
706 if (flags & ~valid_flags)
707 return -EINVAL;
708
709 hu->hdev_flags = flags;
710
711 return 0;
712}
713
714/* hci_uart_tty_ioctl()
715 *
716 * Process IOCTL system call for the tty device.
717 *
718 * Arguments:
719 *
720 * tty pointer to tty instance data
721 * file pointer to open file object for device
722 * cmd IOCTL command code
723 * arg argument for IOCTL call (cmd dependent)
724 *
725 * Return Value: Command dependent
726 */
727static int hci_uart_tty_ioctl(struct tty_struct *tty, struct file *file,
728 unsigned int cmd, unsigned long arg)
729{
730 struct hci_uart *hu = tty->disc_data;
731 int err = 0;
732
733 BT_DBG("");
734
735 /* Verify the status of the device */
736 if (!hu)
737 return -EBADF;
738
739 switch (cmd) {
740 case HCIUARTSETPROTO:
741 if (!test_and_set_bit(HCI_UART_PROTO_SET, &hu->flags)) {
742 err = hci_uart_set_proto(hu, arg);
743 if (err)
744 clear_bit(HCI_UART_PROTO_SET, &hu->flags);
745 } else
746 err = -EBUSY;
747 break;
748
749 case HCIUARTGETPROTO:
750 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
751 err = hu->proto->id;
752 else
753 err = -EUNATCH;
754 break;
755
756 case HCIUARTGETDEVICE:
757 if (test_bit(HCI_UART_REGISTERED, &hu->flags))
758 err = hu->hdev->id;
759 else
760 err = -EUNATCH;
761 break;
762
763 case HCIUARTSETFLAGS:
764 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
765 err = -EBUSY;
766 else
767 err = hci_uart_set_flags(hu, arg);
768 break;
769
770 case HCIUARTGETFLAGS:
771 err = hu->hdev_flags;
772 break;
773
774 default:
775 err = n_tty_ioctl_helper(tty, file, cmd, arg);
776 break;
777 }
778
779 return err;
780}
781
782/*
783 * We don't provide read/write/poll interface for user space.
784 */
785static ssize_t hci_uart_tty_read(struct tty_struct *tty, struct file *file,
786 unsigned char __user *buf, size_t nr)
787{
788 return 0;
789}
790
791static ssize_t hci_uart_tty_write(struct tty_struct *tty, struct file *file,
792 const unsigned char *data, size_t count)
793{
794 return 0;
795}
796
797static __poll_t hci_uart_tty_poll(struct tty_struct *tty,
798 struct file *filp, poll_table *wait)
799{
800 return 0;
801}
802
803static int __init hci_uart_init(void)
804{
805 static struct tty_ldisc_ops hci_uart_ldisc;
806 int err;
807
808 BT_INFO("HCI UART driver ver %s", VERSION);
809
810 /* Register the tty discipline */
811
812 memset(&hci_uart_ldisc, 0, sizeof(hci_uart_ldisc));
813 hci_uart_ldisc.magic = TTY_LDISC_MAGIC;
814 hci_uart_ldisc.name = "n_hci";
815 hci_uart_ldisc.open = hci_uart_tty_open;
816 hci_uart_ldisc.close = hci_uart_tty_close;
817 hci_uart_ldisc.read = hci_uart_tty_read;
818 hci_uart_ldisc.write = hci_uart_tty_write;
819 hci_uart_ldisc.ioctl = hci_uart_tty_ioctl;
820 hci_uart_ldisc.poll = hci_uart_tty_poll;
821 hci_uart_ldisc.receive_buf = hci_uart_tty_receive;
822 hci_uart_ldisc.write_wakeup = hci_uart_tty_wakeup;
823 hci_uart_ldisc.owner = THIS_MODULE;
824
825 err = tty_register_ldisc(N_HCI, &hci_uart_ldisc);
826 if (err) {
827 BT_ERR("HCI line discipline registration failed. (%d)", err);
828 return err;
829 }
830
831#ifdef CONFIG_BT_HCIUART_H4
832 h4_init();
833#endif
834#ifdef CONFIG_BT_HCIUART_BCSP
835 bcsp_init();
836#endif
837#ifdef CONFIG_BT_HCIUART_LL
838 ll_init();
839#endif
840#ifdef CONFIG_BT_HCIUART_ATH3K
841 ath_init();
842#endif
843#ifdef CONFIG_BT_HCIUART_3WIRE
844 h5_init();
845#endif
846#ifdef CONFIG_BT_HCIUART_INTEL
847 intel_init();
848#endif
849#ifdef CONFIG_BT_HCIUART_BCM
850 bcm_init();
851#endif
852#ifdef CONFIG_BT_HCIUART_QCA
853 qca_init();
854#endif
855#ifdef CONFIG_BT_HCIUART_AG6XX
856 ag6xx_init();
857#endif
858#ifdef CONFIG_BT_HCIUART_MRVL
859 mrvl_init();
860#endif
861
862 return 0;
863}
864
865static void __exit hci_uart_exit(void)
866{
867 int err;
868
869#ifdef CONFIG_BT_HCIUART_H4
870 h4_deinit();
871#endif
872#ifdef CONFIG_BT_HCIUART_BCSP
873 bcsp_deinit();
874#endif
875#ifdef CONFIG_BT_HCIUART_LL
876 ll_deinit();
877#endif
878#ifdef CONFIG_BT_HCIUART_ATH3K
879 ath_deinit();
880#endif
881#ifdef CONFIG_BT_HCIUART_3WIRE
882 h5_deinit();
883#endif
884#ifdef CONFIG_BT_HCIUART_INTEL
885 intel_deinit();
886#endif
887#ifdef CONFIG_BT_HCIUART_BCM
888 bcm_deinit();
889#endif
890#ifdef CONFIG_BT_HCIUART_QCA
891 qca_deinit();
892#endif
893#ifdef CONFIG_BT_HCIUART_AG6XX
894 ag6xx_deinit();
895#endif
896#ifdef CONFIG_BT_HCIUART_MRVL
897 mrvl_deinit();
898#endif
899
900 /* Release tty registration of line discipline */
901 err = tty_unregister_ldisc(N_HCI);
902 if (err)
903 BT_ERR("Can't unregister HCI line discipline (%d)", err);
904}
905
906module_init(hci_uart_init);
907module_exit(hci_uart_exit);
908
909MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
910MODULE_DESCRIPTION("Bluetooth HCI UART driver ver " VERSION);
911MODULE_VERSION(VERSION);
912MODULE_LICENSE("GPL");
913MODULE_ALIAS_LDISC(N_HCI);