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
40 static const struct hci_uart_proto *hup[HCI_UART_MAX_PROTO];
41
hci_uart_register_proto(const struct hci_uart_proto * p)42 int 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
hci_uart_unregister_proto(const struct hci_uart_proto * p)57 int 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
hci_uart_get_proto(unsigned int id)70 static 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
hci_uart_tx_complete(struct hci_uart * hu,int pkt_type)78 static 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
hci_uart_dequeue(struct hci_uart * hu)98 static 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
hci_uart_tx_wakeup(struct hci_uart * hu)116 int 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
138 no_schedule:
139 percpu_up_read(&hu->proto_lock);
140
141 return 0;
142 }
143 EXPORT_SYMBOL_GPL(hci_uart_tx_wakeup);
144
hci_uart_write_work(struct work_struct * work)145 static 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
156 restart:
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
hci_uart_init_work(struct work_struct * work)183 void 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
hci_uart_init_ready(struct hci_uart * hu)206 int 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
hci_uart_wait_until_sent(struct hci_uart * hu)216 int 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 */
hci_uart_flush(struct hci_dev * hdev)225 static 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 */
hci_uart_open(struct hci_dev * hdev)251 static 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 */
hci_uart_close(struct hci_dev * hdev)262 static 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 */
hci_uart_send_frame(struct hci_dev * hdev,struct sk_buff * skb)272 static 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 */
hci_uart_has_flow_control(struct hci_uart * hu)295 bool 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 */
hci_uart_set_flow_control(struct hci_uart * hu,bool enable)308 void 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 tty_set_termios(tty, &ktermios);
327 BT_DBG("Disabling hardware flow control: %s",
328 (tty->termios.c_cflag & CRTSCTS) ? "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 tty_set_termios(tty, &ktermios);
361 BT_DBG("Enabling hardware flow control: %s",
362 !(tty->termios.c_cflag & CRTSCTS) ? "failed" : "success");
363 }
364 }
365
hci_uart_set_speeds(struct hci_uart * hu,unsigned int init_speed,unsigned int oper_speed)366 void 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
hci_uart_set_baudrate(struct hci_uart * hu,unsigned int speed)373 void 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
hci_uart_setup(struct hci_dev * hdev)389 static 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
461 done:
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 */
hci_uart_tty_open(struct tty_struct * tty)476 static 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(*hu), 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 /* Use serial port speed as oper_speed */
511 hu->oper_speed = tty->termios.c_ospeed;
512
513 INIT_WORK(&hu->init_ready, hci_uart_init_work);
514 INIT_WORK(&hu->write_work, hci_uart_write_work);
515
516 /* Flush any pending characters in the driver */
517 tty_driver_flush_buffer(tty);
518
519 return 0;
520 }
521
522 /* hci_uart_tty_close()
523 *
524 * Called when the line discipline is changed to something
525 * else, the tty is closed, or the tty detects a hangup.
526 */
hci_uart_tty_close(struct tty_struct * tty)527 static void hci_uart_tty_close(struct tty_struct *tty)
528 {
529 struct hci_uart *hu = tty->disc_data;
530 struct hci_dev *hdev;
531
532 BT_DBG("tty %p", tty);
533
534 /* Detach from the tty */
535 tty->disc_data = NULL;
536
537 if (!hu)
538 return;
539
540 hdev = hu->hdev;
541 if (hdev)
542 hci_uart_close(hdev);
543
544 if (test_bit(HCI_UART_PROTO_READY, &hu->flags)) {
545 percpu_down_write(&hu->proto_lock);
546 clear_bit(HCI_UART_PROTO_READY, &hu->flags);
547 percpu_up_write(&hu->proto_lock);
548
549 cancel_work_sync(&hu->init_ready);
550 cancel_work_sync(&hu->write_work);
551
552 if (hdev) {
553 if (test_bit(HCI_UART_REGISTERED, &hu->flags))
554 hci_unregister_dev(hdev);
555 hci_free_dev(hdev);
556 }
557 hu->proto->close(hu);
558 }
559 clear_bit(HCI_UART_PROTO_SET, &hu->flags);
560
561 percpu_free_rwsem(&hu->proto_lock);
562
563 kfree(hu);
564 }
565
566 /* hci_uart_tty_wakeup()
567 *
568 * Callback for transmit wakeup. Called when low level
569 * device driver can accept more send data.
570 *
571 * Arguments: tty pointer to associated tty instance data
572 * Return Value: None
573 */
hci_uart_tty_wakeup(struct tty_struct * tty)574 static void hci_uart_tty_wakeup(struct tty_struct *tty)
575 {
576 struct hci_uart *hu = tty->disc_data;
577
578 BT_DBG("");
579
580 if (!hu)
581 return;
582
583 clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
584
585 if (tty != hu->tty)
586 return;
587
588 if (test_bit(HCI_UART_PROTO_READY, &hu->flags))
589 hci_uart_tx_wakeup(hu);
590 }
591
592 /* hci_uart_tty_receive()
593 *
594 * Called by tty low level driver when receive data is
595 * available.
596 *
597 * Arguments: tty pointer to tty instance data
598 * data pointer to received data
599 * flags pointer to flags for data
600 * count count of received data in bytes
601 *
602 * Return Value: None
603 */
hci_uart_tty_receive(struct tty_struct * tty,const u8 * data,const u8 * flags,size_t count)604 static void hci_uart_tty_receive(struct tty_struct *tty, const u8 *data,
605 const u8 *flags, size_t count)
606 {
607 struct hci_uart *hu = tty->disc_data;
608
609 if (!hu || tty != hu->tty)
610 return;
611
612 percpu_down_read(&hu->proto_lock);
613
614 if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) {
615 percpu_up_read(&hu->proto_lock);
616 return;
617 }
618
619 /* It does not need a lock here as it is already protected by a mutex in
620 * tty caller
621 */
622 hu->proto->recv(hu, data, count);
623 percpu_up_read(&hu->proto_lock);
624
625 if (hu->hdev)
626 hu->hdev->stat.byte_rx += count;
627
628 tty_unthrottle(tty);
629 }
630
hci_uart_register_dev(struct hci_uart * hu)631 static int hci_uart_register_dev(struct hci_uart *hu)
632 {
633 struct hci_dev *hdev;
634 int err;
635
636 BT_DBG("");
637
638 /* Initialize and register HCI device */
639 hdev = hci_alloc_dev();
640 if (!hdev) {
641 BT_ERR("Can't allocate HCI device");
642 return -ENOMEM;
643 }
644
645 hu->hdev = hdev;
646
647 hdev->bus = HCI_UART;
648 hci_set_drvdata(hdev, hu);
649
650 /* Only when vendor specific setup callback is provided, consider
651 * the manufacturer information valid. This avoids filling in the
652 * value for Ericsson when nothing is specified.
653 */
654 if (hu->proto->setup)
655 hdev->manufacturer = hu->proto->manufacturer;
656
657 hdev->open = hci_uart_open;
658 hdev->close = hci_uart_close;
659 hdev->flush = hci_uart_flush;
660 hdev->send = hci_uart_send_frame;
661 hdev->setup = hci_uart_setup;
662 SET_HCIDEV_DEV(hdev, hu->tty->dev);
663
664 if (test_bit(HCI_UART_RAW_DEVICE, &hu->hdev_flags))
665 set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks);
666
667 if (test_bit(HCI_UART_EXT_CONFIG, &hu->hdev_flags))
668 set_bit(HCI_QUIRK_EXTERNAL_CONFIG, &hdev->quirks);
669
670 if (!test_bit(HCI_UART_RESET_ON_INIT, &hu->hdev_flags))
671 set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);
672
673 /* Only call open() for the protocol after hdev is fully initialized as
674 * open() (or a timer/workqueue it starts) may attempt to reference it.
675 */
676 err = hu->proto->open(hu);
677 if (err) {
678 hu->hdev = NULL;
679 hci_free_dev(hdev);
680 return err;
681 }
682
683 if (test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
684 return 0;
685
686 if (hci_register_dev(hdev) < 0) {
687 BT_ERR("Can't register HCI device");
688 hu->proto->close(hu);
689 hu->hdev = NULL;
690 hci_free_dev(hdev);
691 return -ENODEV;
692 }
693
694 set_bit(HCI_UART_REGISTERED, &hu->flags);
695
696 return 0;
697 }
698
hci_uart_set_proto(struct hci_uart * hu,int id)699 static int hci_uart_set_proto(struct hci_uart *hu, int id)
700 {
701 const struct hci_uart_proto *p;
702 int err;
703
704 p = hci_uart_get_proto(id);
705 if (!p)
706 return -EPROTONOSUPPORT;
707
708 hu->proto = p;
709
710 err = hci_uart_register_dev(hu);
711 if (err) {
712 return err;
713 }
714
715 set_bit(HCI_UART_PROTO_READY, &hu->flags);
716 return 0;
717 }
718
hci_uart_set_flags(struct hci_uart * hu,unsigned long flags)719 static int hci_uart_set_flags(struct hci_uart *hu, unsigned long flags)
720 {
721 unsigned long valid_flags = BIT(HCI_UART_RAW_DEVICE) |
722 BIT(HCI_UART_RESET_ON_INIT) |
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 * cmd IOCTL command code
743 * arg argument for IOCTL call (cmd dependent)
744 *
745 * Return Value: Command dependent
746 */
hci_uart_tty_ioctl(struct tty_struct * tty,unsigned int cmd,unsigned long arg)747 static int hci_uart_tty_ioctl(struct tty_struct *tty, unsigned int cmd,
748 unsigned long arg)
749 {
750 struct hci_uart *hu = tty->disc_data;
751 int err = 0;
752
753 BT_DBG("");
754
755 /* Verify the status of the device */
756 if (!hu)
757 return -EBADF;
758
759 switch (cmd) {
760 case HCIUARTSETPROTO:
761 if (!test_and_set_bit(HCI_UART_PROTO_SET, &hu->flags)) {
762 err = hci_uart_set_proto(hu, arg);
763 if (err)
764 clear_bit(HCI_UART_PROTO_SET, &hu->flags);
765 } else
766 err = -EBUSY;
767 break;
768
769 case HCIUARTGETPROTO:
770 if (test_bit(HCI_UART_PROTO_SET, &hu->flags) &&
771 test_bit(HCI_UART_PROTO_READY, &hu->flags))
772 err = hu->proto->id;
773 else
774 err = -EUNATCH;
775 break;
776
777 case HCIUARTGETDEVICE:
778 if (test_bit(HCI_UART_REGISTERED, &hu->flags))
779 err = hu->hdev->id;
780 else
781 err = -EUNATCH;
782 break;
783
784 case HCIUARTSETFLAGS:
785 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
786 err = -EBUSY;
787 else
788 err = hci_uart_set_flags(hu, arg);
789 break;
790
791 case HCIUARTGETFLAGS:
792 err = hu->hdev_flags;
793 break;
794
795 default:
796 err = n_tty_ioctl_helper(tty, cmd, arg);
797 break;
798 }
799
800 return err;
801 }
802
803 /*
804 * We don't provide read/write/poll interface for user space.
805 */
hci_uart_tty_read(struct tty_struct * tty,struct file * file,u8 * buf,size_t nr,void ** cookie,unsigned long offset)806 static ssize_t hci_uart_tty_read(struct tty_struct *tty, struct file *file,
807 u8 *buf, size_t nr, void **cookie,
808 unsigned long offset)
809 {
810 return 0;
811 }
812
hci_uart_tty_write(struct tty_struct * tty,struct file * file,const u8 * data,size_t count)813 static ssize_t hci_uart_tty_write(struct tty_struct *tty, struct file *file,
814 const u8 *data, size_t count)
815 {
816 return 0;
817 }
818
819 static struct tty_ldisc_ops hci_uart_ldisc = {
820 .owner = THIS_MODULE,
821 .num = N_HCI,
822 .name = "n_hci",
823 .open = hci_uart_tty_open,
824 .close = hci_uart_tty_close,
825 .read = hci_uart_tty_read,
826 .write = hci_uart_tty_write,
827 .ioctl = hci_uart_tty_ioctl,
828 .compat_ioctl = hci_uart_tty_ioctl,
829 .receive_buf = hci_uart_tty_receive,
830 .write_wakeup = hci_uart_tty_wakeup,
831 };
832
hci_uart_init(void)833 static int __init hci_uart_init(void)
834 {
835 int err;
836
837 BT_INFO("HCI UART driver ver %s", VERSION);
838
839 /* Register the tty discipline */
840 err = tty_register_ldisc(&hci_uart_ldisc);
841 if (err) {
842 BT_ERR("HCI line discipline registration failed. (%d)", err);
843 return err;
844 }
845
846 #ifdef CONFIG_BT_HCIUART_H4
847 h4_init();
848 #endif
849 #ifdef CONFIG_BT_HCIUART_BCSP
850 bcsp_init();
851 #endif
852 #ifdef CONFIG_BT_HCIUART_LL
853 ll_init();
854 #endif
855 #ifdef CONFIG_BT_HCIUART_ATH3K
856 ath_init();
857 #endif
858 #ifdef CONFIG_BT_HCIUART_3WIRE
859 h5_init();
860 #endif
861 #ifdef CONFIG_BT_HCIUART_INTEL
862 intel_init();
863 #endif
864 #ifdef CONFIG_BT_HCIUART_BCM
865 bcm_init();
866 #endif
867 #ifdef CONFIG_BT_HCIUART_QCA
868 qca_init();
869 #endif
870 #ifdef CONFIG_BT_HCIUART_AG6XX
871 ag6xx_init();
872 #endif
873 #ifdef CONFIG_BT_HCIUART_MRVL
874 mrvl_init();
875 #endif
876 #ifdef CONFIG_BT_HCIUART_AML
877 aml_init();
878 #endif
879 return 0;
880 }
881
hci_uart_exit(void)882 static void __exit hci_uart_exit(void)
883 {
884 #ifdef CONFIG_BT_HCIUART_H4
885 h4_deinit();
886 #endif
887 #ifdef CONFIG_BT_HCIUART_BCSP
888 bcsp_deinit();
889 #endif
890 #ifdef CONFIG_BT_HCIUART_LL
891 ll_deinit();
892 #endif
893 #ifdef CONFIG_BT_HCIUART_ATH3K
894 ath_deinit();
895 #endif
896 #ifdef CONFIG_BT_HCIUART_3WIRE
897 h5_deinit();
898 #endif
899 #ifdef CONFIG_BT_HCIUART_INTEL
900 intel_deinit();
901 #endif
902 #ifdef CONFIG_BT_HCIUART_BCM
903 bcm_deinit();
904 #endif
905 #ifdef CONFIG_BT_HCIUART_QCA
906 qca_deinit();
907 #endif
908 #ifdef CONFIG_BT_HCIUART_AG6XX
909 ag6xx_deinit();
910 #endif
911 #ifdef CONFIG_BT_HCIUART_MRVL
912 mrvl_deinit();
913 #endif
914 #ifdef CONFIG_BT_HCIUART_AML
915 aml_deinit();
916 #endif
917 tty_unregister_ldisc(&hci_uart_ldisc);
918 }
919
920 module_init(hci_uart_init);
921 module_exit(hci_uart_exit);
922
923 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
924 MODULE_DESCRIPTION("Bluetooth HCI UART driver ver " VERSION);
925 MODULE_VERSION(VERSION);
926 MODULE_LICENSE("GPL");
927 MODULE_ALIAS_LDISC(N_HCI);
928