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 if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) {
153 clear_bit(HCI_UART_SENDING, &hu->tx_state);
154 return;
155 }
156
157 /* REVISIT: should we cope with bad skbs or ->write() returning
158 * and error value ?
159 */
160
161 restart:
162 clear_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
163
164 while ((skb = hci_uart_dequeue(hu))) {
165 int len;
166
167 set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
168 len = tty->ops->write(tty, skb->data, skb->len);
169 hdev->stat.byte_tx += len;
170
171 skb_pull(skb, len);
172 if (skb->len) {
173 hu->tx_skb = skb;
174 break;
175 }
176
177 hci_uart_tx_complete(hu, hci_skb_pkt_type(skb));
178 kfree_skb(skb);
179 }
180
181 clear_bit(HCI_UART_SENDING, &hu->tx_state);
182 if (test_bit(HCI_UART_TX_WAKEUP, &hu->tx_state))
183 goto restart;
184
185 wake_up_bit(&hu->tx_state, HCI_UART_SENDING);
186 }
187
hci_uart_init_work(struct work_struct * work)188 void hci_uart_init_work(struct work_struct *work)
189 {
190 struct hci_uart *hu = container_of(work, struct hci_uart, init_ready);
191 int err;
192 struct hci_dev *hdev;
193
194 if (!test_and_clear_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
195 return;
196
197 err = hci_register_dev(hu->hdev);
198 if (err < 0) {
199 BT_ERR("Can't register HCI device");
200 clear_bit(HCI_UART_PROTO_READY, &hu->flags);
201 hu->proto->close(hu);
202 hdev = hu->hdev;
203 hu->hdev = NULL;
204 hci_free_dev(hdev);
205 return;
206 }
207
208 set_bit(HCI_UART_REGISTERED, &hu->flags);
209 }
210
hci_uart_init_ready(struct hci_uart * hu)211 int hci_uart_init_ready(struct hci_uart *hu)
212 {
213 if (!test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
214 return -EALREADY;
215
216 schedule_work(&hu->init_ready);
217
218 return 0;
219 }
220
hci_uart_wait_until_sent(struct hci_uart * hu)221 int hci_uart_wait_until_sent(struct hci_uart *hu)
222 {
223 return wait_on_bit_timeout(&hu->tx_state, HCI_UART_SENDING,
224 TASK_INTERRUPTIBLE,
225 msecs_to_jiffies(2000));
226 }
227
228 /* ------- Interface to HCI layer ------ */
229 /* Reset device */
hci_uart_flush(struct hci_dev * hdev)230 static int hci_uart_flush(struct hci_dev *hdev)
231 {
232 struct hci_uart *hu = hci_get_drvdata(hdev);
233 struct tty_struct *tty = hu->tty;
234
235 BT_DBG("hdev %p tty %p", hdev, tty);
236
237 if (hu->tx_skb) {
238 kfree_skb(hu->tx_skb); hu->tx_skb = NULL;
239 }
240
241 /* Flush any pending characters in the driver and discipline. */
242 tty_ldisc_flush(tty);
243 tty_driver_flush_buffer(tty);
244
245 percpu_down_read(&hu->proto_lock);
246
247 if (test_bit(HCI_UART_PROTO_READY, &hu->flags))
248 hu->proto->flush(hu);
249
250 percpu_up_read(&hu->proto_lock);
251
252 return 0;
253 }
254
255 /* Initialize device */
hci_uart_open(struct hci_dev * hdev)256 static int hci_uart_open(struct hci_dev *hdev)
257 {
258 BT_DBG("%s %p", hdev->name, hdev);
259
260 /* Undo clearing this from hci_uart_close() */
261 hdev->flush = hci_uart_flush;
262
263 return 0;
264 }
265
266 /* Close device */
hci_uart_close(struct hci_dev * hdev)267 static int hci_uart_close(struct hci_dev *hdev)
268 {
269 BT_DBG("hdev %p", hdev);
270
271 hci_uart_flush(hdev);
272 hdev->flush = NULL;
273 return 0;
274 }
275
276 /* Send frames from HCI layer */
hci_uart_send_frame(struct hci_dev * hdev,struct sk_buff * skb)277 static int hci_uart_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
278 {
279 struct hci_uart *hu = hci_get_drvdata(hdev);
280
281 BT_DBG("%s: type %d len %d", hdev->name, hci_skb_pkt_type(skb),
282 skb->len);
283
284 percpu_down_read(&hu->proto_lock);
285
286 if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) {
287 percpu_up_read(&hu->proto_lock);
288 return -EUNATCH;
289 }
290
291 hu->proto->enqueue(hu, skb);
292 percpu_up_read(&hu->proto_lock);
293
294 hci_uart_tx_wakeup(hu);
295
296 return 0;
297 }
298
299 /* Check the underlying device or tty has flow control support */
hci_uart_has_flow_control(struct hci_uart * hu)300 bool hci_uart_has_flow_control(struct hci_uart *hu)
301 {
302 /* serdev nodes check if the needed operations are present */
303 if (hu->serdev)
304 return true;
305
306 if (hu->tty->driver->ops->tiocmget && hu->tty->driver->ops->tiocmset)
307 return true;
308
309 return false;
310 }
311
312 /* Flow control or un-flow control the device */
hci_uart_set_flow_control(struct hci_uart * hu,bool enable)313 void hci_uart_set_flow_control(struct hci_uart *hu, bool enable)
314 {
315 struct tty_struct *tty = hu->tty;
316 struct ktermios ktermios;
317 int status;
318 unsigned int set = 0;
319 unsigned int clear = 0;
320
321 if (hu->serdev) {
322 serdev_device_set_flow_control(hu->serdev, !enable);
323 serdev_device_set_rts(hu->serdev, !enable);
324 return;
325 }
326
327 if (enable) {
328 /* Disable hardware flow control */
329 ktermios = tty->termios;
330 ktermios.c_cflag &= ~CRTSCTS;
331 status = tty_set_termios(tty, &ktermios);
332 BT_DBG("Disabling hardware flow control: %s",
333 status ? "failed" : "success");
334
335 /* Clear RTS to prevent the device from sending */
336 /* Most UARTs need OUT2 to enable interrupts */
337 status = tty->driver->ops->tiocmget(tty);
338 BT_DBG("Current tiocm 0x%x", status);
339
340 set &= ~(TIOCM_OUT2 | TIOCM_RTS);
341 clear = ~set;
342 set &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
343 TIOCM_OUT2 | TIOCM_LOOP;
344 clear &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
345 TIOCM_OUT2 | TIOCM_LOOP;
346 status = tty->driver->ops->tiocmset(tty, set, clear);
347 BT_DBG("Clearing RTS: %s", status ? "failed" : "success");
348 } else {
349 /* Set RTS to allow the device to send again */
350 status = tty->driver->ops->tiocmget(tty);
351 BT_DBG("Current tiocm 0x%x", status);
352
353 set |= (TIOCM_OUT2 | TIOCM_RTS);
354 clear = ~set;
355 set &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
356 TIOCM_OUT2 | TIOCM_LOOP;
357 clear &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
358 TIOCM_OUT2 | TIOCM_LOOP;
359 status = tty->driver->ops->tiocmset(tty, set, clear);
360 BT_DBG("Setting RTS: %s", status ? "failed" : "success");
361
362 /* Re-enable hardware flow control */
363 ktermios = tty->termios;
364 ktermios.c_cflag |= CRTSCTS;
365 status = tty_set_termios(tty, &ktermios);
366 BT_DBG("Enabling hardware flow control: %s",
367 status ? "failed" : "success");
368 }
369 }
370
hci_uart_set_speeds(struct hci_uart * hu,unsigned int init_speed,unsigned int oper_speed)371 void hci_uart_set_speeds(struct hci_uart *hu, unsigned int init_speed,
372 unsigned int oper_speed)
373 {
374 hu->init_speed = init_speed;
375 hu->oper_speed = oper_speed;
376 }
377
hci_uart_set_baudrate(struct hci_uart * hu,unsigned int speed)378 void hci_uart_set_baudrate(struct hci_uart *hu, unsigned int speed)
379 {
380 struct tty_struct *tty = hu->tty;
381 struct ktermios ktermios;
382
383 ktermios = tty->termios;
384 ktermios.c_cflag &= ~CBAUD;
385 tty_termios_encode_baud_rate(&ktermios, speed, speed);
386
387 /* tty_set_termios() return not checked as it is always 0 */
388 tty_set_termios(tty, &ktermios);
389
390 BT_DBG("%s: New tty speeds: %d/%d", hu->hdev->name,
391 tty->termios.c_ispeed, tty->termios.c_ospeed);
392 }
393
hci_uart_setup(struct hci_dev * hdev)394 static int hci_uart_setup(struct hci_dev *hdev)
395 {
396 struct hci_uart *hu = hci_get_drvdata(hdev);
397 struct hci_rp_read_local_version *ver;
398 struct sk_buff *skb;
399 unsigned int speed;
400 int err;
401
402 /* Init speed if any */
403 if (hu->init_speed)
404 speed = hu->init_speed;
405 else if (hu->proto->init_speed)
406 speed = hu->proto->init_speed;
407 else
408 speed = 0;
409
410 if (speed)
411 hci_uart_set_baudrate(hu, speed);
412
413 /* Operational speed if any */
414 if (hu->oper_speed)
415 speed = hu->oper_speed;
416 else if (hu->proto->oper_speed)
417 speed = hu->proto->oper_speed;
418 else
419 speed = 0;
420
421 if (hu->proto->set_baudrate && speed) {
422 err = hu->proto->set_baudrate(hu, speed);
423 if (!err)
424 hci_uart_set_baudrate(hu, speed);
425 }
426
427 if (hu->proto->setup)
428 return hu->proto->setup(hu);
429
430 if (!test_bit(HCI_UART_VND_DETECT, &hu->hdev_flags))
431 return 0;
432
433 skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_VERSION, 0, NULL,
434 HCI_INIT_TIMEOUT);
435 if (IS_ERR(skb)) {
436 BT_ERR("%s: Reading local version information failed (%ld)",
437 hdev->name, PTR_ERR(skb));
438 return 0;
439 }
440
441 if (skb->len != sizeof(*ver)) {
442 BT_ERR("%s: Event length mismatch for version information",
443 hdev->name);
444 goto done;
445 }
446
447 ver = (struct hci_rp_read_local_version *)skb->data;
448
449 switch (le16_to_cpu(ver->manufacturer)) {
450 #ifdef CONFIG_BT_HCIUART_INTEL
451 case 2:
452 hdev->set_bdaddr = btintel_set_bdaddr;
453 btintel_check_bdaddr(hdev);
454 break;
455 #endif
456 #ifdef CONFIG_BT_HCIUART_BCM
457 case 15:
458 hdev->set_bdaddr = btbcm_set_bdaddr;
459 btbcm_check_bdaddr(hdev);
460 break;
461 #endif
462 default:
463 break;
464 }
465
466 done:
467 kfree_skb(skb);
468 return 0;
469 }
470
471 /* ------ LDISC part ------ */
472 /* hci_uart_tty_open
473 *
474 * Called when line discipline changed to HCI_UART.
475 *
476 * Arguments:
477 * tty pointer to tty info structure
478 * Return Value:
479 * 0 if success, otherwise error code
480 */
hci_uart_tty_open(struct tty_struct * tty)481 static int hci_uart_tty_open(struct tty_struct *tty)
482 {
483 struct hci_uart *hu;
484
485 BT_DBG("tty %p", tty);
486
487 /* Error if the tty has no write op instead of leaving an exploitable
488 * hole
489 */
490 if (tty->ops->write == NULL)
491 return -EOPNOTSUPP;
492
493 hu = kzalloc(sizeof(struct hci_uart), GFP_KERNEL);
494 if (!hu) {
495 BT_ERR("Can't allocate control structure");
496 return -ENFILE;
497 }
498 if (percpu_init_rwsem(&hu->proto_lock)) {
499 BT_ERR("Can't allocate semaphore structure");
500 kfree(hu);
501 return -ENOMEM;
502 }
503
504 tty->disc_data = hu;
505 hu->tty = tty;
506 tty->receive_room = 65536;
507
508 /* disable alignment support by default */
509 hu->alignment = 1;
510 hu->padding = 0;
511
512 INIT_WORK(&hu->init_ready, hci_uart_init_work);
513 INIT_WORK(&hu->write_work, hci_uart_write_work);
514
515 /* Flush any pending characters in the driver */
516 tty_driver_flush_buffer(tty);
517
518 return 0;
519 }
520
521 /* hci_uart_tty_close()
522 *
523 * Called when the line discipline is changed to something
524 * else, the tty is closed, or the tty detects a hangup.
525 */
hci_uart_tty_close(struct tty_struct * tty)526 static void hci_uart_tty_close(struct tty_struct *tty)
527 {
528 struct hci_uart *hu = tty->disc_data;
529 struct hci_dev *hdev;
530
531 BT_DBG("tty %p", tty);
532
533 /* Detach from the tty */
534 tty->disc_data = NULL;
535
536 if (!hu)
537 return;
538
539 hdev = hu->hdev;
540 if (hdev)
541 hci_uart_close(hdev);
542
543 if (test_bit(HCI_UART_PROTO_READY, &hu->flags)) {
544 percpu_down_write(&hu->proto_lock);
545 clear_bit(HCI_UART_PROTO_READY, &hu->flags);
546 percpu_up_write(&hu->proto_lock);
547
548 cancel_work_sync(&hu->init_ready);
549 cancel_work_sync(&hu->write_work);
550
551 if (hdev) {
552 if (test_bit(HCI_UART_REGISTERED, &hu->flags))
553 hci_unregister_dev(hdev);
554 hci_free_dev(hdev);
555 }
556 hu->proto->close(hu);
557 }
558 clear_bit(HCI_UART_PROTO_SET, &hu->flags);
559
560 percpu_free_rwsem(&hu->proto_lock);
561
562 kfree(hu);
563 }
564
565 /* hci_uart_tty_wakeup()
566 *
567 * Callback for transmit wakeup. Called when low level
568 * device driver can accept more send data.
569 *
570 * Arguments: tty pointer to associated tty instance data
571 * Return Value: None
572 */
hci_uart_tty_wakeup(struct tty_struct * tty)573 static void hci_uart_tty_wakeup(struct tty_struct *tty)
574 {
575 struct hci_uart *hu = tty->disc_data;
576
577 BT_DBG("");
578
579 if (!hu)
580 return;
581
582 clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
583
584 if (tty != hu->tty)
585 return;
586
587 if (test_bit(HCI_UART_PROTO_READY, &hu->flags))
588 hci_uart_tx_wakeup(hu);
589 }
590
591 /* hci_uart_tty_receive()
592 *
593 * Called by tty low level driver when receive data is
594 * available.
595 *
596 * Arguments: tty pointer to tty isntance data
597 * data pointer to received data
598 * flags pointer to flags for data
599 * count count of received data in bytes
600 *
601 * Return Value: None
602 */
hci_uart_tty_receive(struct tty_struct * tty,const u8 * data,char * flags,int count)603 static void hci_uart_tty_receive(struct tty_struct *tty, const u8 *data,
604 char *flags, int count)
605 {
606 struct hci_uart *hu = tty->disc_data;
607
608 if (!hu || tty != hu->tty)
609 return;
610
611 percpu_down_read(&hu->proto_lock);
612
613 if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) {
614 percpu_up_read(&hu->proto_lock);
615 return;
616 }
617
618 /* It does not need a lock here as it is already protected by a mutex in
619 * tty caller
620 */
621 hu->proto->recv(hu, data, count);
622 percpu_up_read(&hu->proto_lock);
623
624 if (hu->hdev)
625 hu->hdev->stat.byte_rx += count;
626
627 tty_unthrottle(tty);
628 }
629
hci_uart_register_dev(struct hci_uart * hu)630 static int hci_uart_register_dev(struct hci_uart *hu)
631 {
632 struct hci_dev *hdev;
633 int err;
634
635 BT_DBG("");
636
637 /* Initialize and register HCI device */
638 hdev = hci_alloc_dev();
639 if (!hdev) {
640 BT_ERR("Can't allocate HCI device");
641 return -ENOMEM;
642 }
643
644 hu->hdev = hdev;
645
646 hdev->bus = HCI_UART;
647 hci_set_drvdata(hdev, hu);
648
649 /* Only when vendor specific setup callback is provided, consider
650 * the manufacturer information valid. This avoids filling in the
651 * value for Ericsson when nothing is specified.
652 */
653 if (hu->proto->setup)
654 hdev->manufacturer = hu->proto->manufacturer;
655
656 hdev->open = hci_uart_open;
657 hdev->close = hci_uart_close;
658 hdev->flush = hci_uart_flush;
659 hdev->send = hci_uart_send_frame;
660 hdev->setup = hci_uart_setup;
661 SET_HCIDEV_DEV(hdev, hu->tty->dev);
662
663 if (test_bit(HCI_UART_RAW_DEVICE, &hu->hdev_flags))
664 set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks);
665
666 if (test_bit(HCI_UART_EXT_CONFIG, &hu->hdev_flags))
667 set_bit(HCI_QUIRK_EXTERNAL_CONFIG, &hdev->quirks);
668
669 if (!test_bit(HCI_UART_RESET_ON_INIT, &hu->hdev_flags))
670 set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);
671
672 if (test_bit(HCI_UART_CREATE_AMP, &hu->hdev_flags))
673 hdev->dev_type = HCI_AMP;
674 else
675 hdev->dev_type = HCI_PRIMARY;
676
677 /* Only call open() for the protocol after hdev is fully initialized as
678 * open() (or a timer/workqueue it starts) may attempt to reference it.
679 */
680 err = hu->proto->open(hu);
681 if (err) {
682 hu->hdev = NULL;
683 hci_free_dev(hdev);
684 return err;
685 }
686
687 if (test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
688 return 0;
689
690 if (hci_register_dev(hdev) < 0) {
691 BT_ERR("Can't register HCI device");
692 hu->proto->close(hu);
693 hu->hdev = NULL;
694 hci_free_dev(hdev);
695 return -ENODEV;
696 }
697
698 set_bit(HCI_UART_REGISTERED, &hu->flags);
699
700 return 0;
701 }
702
hci_uart_set_proto(struct hci_uart * hu,int id)703 static int hci_uart_set_proto(struct hci_uart *hu, int id)
704 {
705 const struct hci_uart_proto *p;
706 int err;
707
708 p = hci_uart_get_proto(id);
709 if (!p)
710 return -EPROTONOSUPPORT;
711
712 hu->proto = p;
713
714 err = hci_uart_register_dev(hu);
715 if (err) {
716 return err;
717 }
718
719 set_bit(HCI_UART_PROTO_READY, &hu->flags);
720 return 0;
721 }
722
hci_uart_set_flags(struct hci_uart * hu,unsigned long flags)723 static int hci_uart_set_flags(struct hci_uart *hu, unsigned long flags)
724 {
725 unsigned long valid_flags = BIT(HCI_UART_RAW_DEVICE) |
726 BIT(HCI_UART_RESET_ON_INIT) |
727 BIT(HCI_UART_CREATE_AMP) |
728 BIT(HCI_UART_INIT_PENDING) |
729 BIT(HCI_UART_EXT_CONFIG) |
730 BIT(HCI_UART_VND_DETECT);
731
732 if (flags & ~valid_flags)
733 return -EINVAL;
734
735 hu->hdev_flags = flags;
736
737 return 0;
738 }
739
740 /* hci_uart_tty_ioctl()
741 *
742 * Process IOCTL system call for the tty device.
743 *
744 * Arguments:
745 *
746 * tty pointer to tty instance data
747 * file pointer to open file object for device
748 * cmd IOCTL command code
749 * arg argument for IOCTL call (cmd dependent)
750 *
751 * Return Value: Command dependent
752 */
hci_uart_tty_ioctl(struct tty_struct * tty,struct file * file,unsigned int cmd,unsigned long arg)753 static int hci_uart_tty_ioctl(struct tty_struct *tty, struct file *file,
754 unsigned int cmd, unsigned long arg)
755 {
756 struct hci_uart *hu = tty->disc_data;
757 int err = 0;
758
759 BT_DBG("");
760
761 /* Verify the status of the device */
762 if (!hu)
763 return -EBADF;
764
765 switch (cmd) {
766 case HCIUARTSETPROTO:
767 if (!test_and_set_bit(HCI_UART_PROTO_SET, &hu->flags)) {
768 err = hci_uart_set_proto(hu, arg);
769 if (err)
770 clear_bit(HCI_UART_PROTO_SET, &hu->flags);
771 } else
772 err = -EBUSY;
773 break;
774
775 case HCIUARTGETPROTO:
776 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
777 err = hu->proto->id;
778 else
779 err = -EUNATCH;
780 break;
781
782 case HCIUARTGETDEVICE:
783 if (test_bit(HCI_UART_REGISTERED, &hu->flags))
784 err = hu->hdev->id;
785 else
786 err = -EUNATCH;
787 break;
788
789 case HCIUARTSETFLAGS:
790 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
791 err = -EBUSY;
792 else
793 err = hci_uart_set_flags(hu, arg);
794 break;
795
796 case HCIUARTGETFLAGS:
797 err = hu->hdev_flags;
798 break;
799
800 default:
801 err = n_tty_ioctl_helper(tty, file, cmd, arg);
802 break;
803 }
804
805 return err;
806 }
807
808 /*
809 * We don't provide read/write/poll interface for user space.
810 */
hci_uart_tty_read(struct tty_struct * tty,struct file * file,unsigned char * buf,size_t nr,void ** cookie,unsigned long offset)811 static ssize_t hci_uart_tty_read(struct tty_struct *tty, struct file *file,
812 unsigned char *buf, size_t nr,
813 void **cookie, unsigned long offset)
814 {
815 return 0;
816 }
817
hci_uart_tty_write(struct tty_struct * tty,struct file * file,const unsigned char * data,size_t count)818 static ssize_t hci_uart_tty_write(struct tty_struct *tty, struct file *file,
819 const unsigned char *data, size_t count)
820 {
821 return 0;
822 }
823
hci_uart_tty_poll(struct tty_struct * tty,struct file * filp,poll_table * wait)824 static __poll_t hci_uart_tty_poll(struct tty_struct *tty,
825 struct file *filp, poll_table *wait)
826 {
827 return 0;
828 }
829
830 static struct tty_ldisc_ops hci_uart_ldisc = {
831 .owner = THIS_MODULE,
832 .magic = TTY_LDISC_MAGIC,
833 .name = "n_hci",
834 .open = hci_uart_tty_open,
835 .close = hci_uart_tty_close,
836 .read = hci_uart_tty_read,
837 .write = hci_uart_tty_write,
838 .ioctl = hci_uart_tty_ioctl,
839 .compat_ioctl = hci_uart_tty_ioctl,
840 .poll = hci_uart_tty_poll,
841 .receive_buf = hci_uart_tty_receive,
842 .write_wakeup = hci_uart_tty_wakeup,
843 };
844
hci_uart_init(void)845 static int __init hci_uart_init(void)
846 {
847 int err;
848
849 BT_INFO("HCI UART driver ver %s", VERSION);
850
851 /* Register the tty discipline */
852 err = tty_register_ldisc(N_HCI, &hci_uart_ldisc);
853 if (err) {
854 BT_ERR("HCI line discipline registration failed. (%d)", err);
855 return err;
856 }
857
858 #ifdef CONFIG_BT_HCIUART_H4
859 h4_init();
860 #endif
861 #ifdef CONFIG_BT_HCIUART_BCSP
862 bcsp_init();
863 #endif
864 #ifdef CONFIG_BT_HCIUART_LL
865 ll_init();
866 #endif
867 #ifdef CONFIG_BT_HCIUART_ATH3K
868 ath_init();
869 #endif
870 #ifdef CONFIG_BT_HCIUART_3WIRE
871 h5_init();
872 #endif
873 #ifdef CONFIG_BT_HCIUART_INTEL
874 intel_init();
875 #endif
876 #ifdef CONFIG_BT_HCIUART_BCM
877 bcm_init();
878 #endif
879 #ifdef CONFIG_BT_HCIUART_QCA
880 qca_init();
881 #endif
882 #ifdef CONFIG_BT_HCIUART_AG6XX
883 ag6xx_init();
884 #endif
885 #ifdef CONFIG_BT_HCIUART_MRVL
886 mrvl_init();
887 #endif
888
889 return 0;
890 }
891
hci_uart_exit(void)892 static void __exit hci_uart_exit(void)
893 {
894 int err;
895
896 #ifdef CONFIG_BT_HCIUART_H4
897 h4_deinit();
898 #endif
899 #ifdef CONFIG_BT_HCIUART_BCSP
900 bcsp_deinit();
901 #endif
902 #ifdef CONFIG_BT_HCIUART_LL
903 ll_deinit();
904 #endif
905 #ifdef CONFIG_BT_HCIUART_ATH3K
906 ath_deinit();
907 #endif
908 #ifdef CONFIG_BT_HCIUART_3WIRE
909 h5_deinit();
910 #endif
911 #ifdef CONFIG_BT_HCIUART_INTEL
912 intel_deinit();
913 #endif
914 #ifdef CONFIG_BT_HCIUART_BCM
915 bcm_deinit();
916 #endif
917 #ifdef CONFIG_BT_HCIUART_QCA
918 qca_deinit();
919 #endif
920 #ifdef CONFIG_BT_HCIUART_AG6XX
921 ag6xx_deinit();
922 #endif
923 #ifdef CONFIG_BT_HCIUART_MRVL
924 mrvl_deinit();
925 #endif
926
927 /* Release tty registration of line discipline */
928 err = tty_unregister_ldisc(N_HCI);
929 if (err)
930 BT_ERR("Can't unregister HCI line discipline (%d)", err);
931 }
932
933 module_init(hci_uart_init);
934 module_exit(hci_uart_exit);
935
936 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
937 MODULE_DESCRIPTION("Bluetooth HCI UART driver ver " VERSION);
938 MODULE_VERSION(VERSION);
939 MODULE_LICENSE("GPL");
940 MODULE_ALIAS_LDISC(N_HCI);
941