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