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
55 static const struct hci_uart_proto *hup[HCI_UART_MAX_PROTO];
56
hci_uart_register_proto(const struct hci_uart_proto * p)57 int 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
hci_uart_unregister_proto(const struct hci_uart_proto * p)72 int 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
hci_uart_get_proto(unsigned int id)85 static 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
hci_uart_tx_complete(struct hci_uart * hu,int pkt_type)93 static 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
hci_uart_dequeue(struct hci_uart * hu)113 static 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
hci_uart_tx_wakeup(struct hci_uart * hu)131 int 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
154 no_schedule:
155 percpu_up_read(&hu->proto_lock);
156
157 return 0;
158 }
159 EXPORT_SYMBOL_GPL(hci_uart_tx_wakeup);
160
hci_uart_write_work(struct work_struct * work)161 static 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
172 restart:
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
hci_uart_init_work(struct work_struct * work)198 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 clear_bit(HCI_UART_PROTO_READY, &hu->flags);
211 hu->proto->close(hu);
212 hdev = hu->hdev;
213 hu->hdev = NULL;
214 hci_free_dev(hdev);
215 return;
216 }
217
218 set_bit(HCI_UART_REGISTERED, &hu->flags);
219 }
220
hci_uart_init_ready(struct hci_uart * hu)221 int 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 /* Reset device */
hci_uart_flush(struct hci_dev * hdev)233 static int hci_uart_flush(struct hci_dev *hdev)
234 {
235 struct hci_uart *hu = hci_get_drvdata(hdev);
236 struct tty_struct *tty = hu->tty;
237
238 BT_DBG("hdev %p tty %p", hdev, tty);
239
240 if (hu->tx_skb) {
241 kfree_skb(hu->tx_skb); hu->tx_skb = NULL;
242 }
243
244 /* Flush any pending characters in the driver and discipline. */
245 tty_ldisc_flush(tty);
246 tty_driver_flush_buffer(tty);
247
248 percpu_down_read(&hu->proto_lock);
249
250 if (test_bit(HCI_UART_PROTO_READY, &hu->flags))
251 hu->proto->flush(hu);
252
253 percpu_up_read(&hu->proto_lock);
254
255 return 0;
256 }
257
258 /* Initialize device */
hci_uart_open(struct hci_dev * hdev)259 static int hci_uart_open(struct hci_dev *hdev)
260 {
261 BT_DBG("%s %p", hdev->name, hdev);
262
263 /* Undo clearing this from hci_uart_close() */
264 hdev->flush = hci_uart_flush;
265
266 return 0;
267 }
268
269 /* Close device */
hci_uart_close(struct hci_dev * hdev)270 static int hci_uart_close(struct hci_dev *hdev)
271 {
272 BT_DBG("hdev %p", hdev);
273
274 hci_uart_flush(hdev);
275 hdev->flush = NULL;
276 return 0;
277 }
278
279 /* Send frames from HCI layer */
hci_uart_send_frame(struct hci_dev * hdev,struct sk_buff * skb)280 static int hci_uart_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
281 {
282 struct hci_uart *hu = hci_get_drvdata(hdev);
283
284 BT_DBG("%s: type %d len %d", hdev->name, hci_skb_pkt_type(skb),
285 skb->len);
286
287 percpu_down_read(&hu->proto_lock);
288
289 if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) {
290 percpu_up_read(&hu->proto_lock);
291 return -EUNATCH;
292 }
293
294 hu->proto->enqueue(hu, skb);
295 percpu_up_read(&hu->proto_lock);
296
297 hci_uart_tx_wakeup(hu);
298
299 return 0;
300 }
301
302 /* Check the underlying device or tty has flow control support */
hci_uart_has_flow_control(struct hci_uart * hu)303 bool hci_uart_has_flow_control(struct hci_uart *hu)
304 {
305 /* serdev nodes check if the needed operations are present */
306 if (hu->serdev)
307 return true;
308
309 if (hu->tty->driver->ops->tiocmget && hu->tty->driver->ops->tiocmset)
310 return true;
311
312 return false;
313 }
314
315 /* Flow control or un-flow control the device */
hci_uart_set_flow_control(struct hci_uart * hu,bool enable)316 void hci_uart_set_flow_control(struct hci_uart *hu, bool enable)
317 {
318 struct tty_struct *tty = hu->tty;
319 struct ktermios ktermios;
320 int status;
321 unsigned int set = 0;
322 unsigned int clear = 0;
323
324 if (hu->serdev) {
325 serdev_device_set_flow_control(hu->serdev, !enable);
326 serdev_device_set_rts(hu->serdev, !enable);
327 return;
328 }
329
330 if (enable) {
331 /* Disable hardware flow control */
332 ktermios = tty->termios;
333 ktermios.c_cflag &= ~CRTSCTS;
334 status = tty_set_termios(tty, &ktermios);
335 BT_DBG("Disabling hardware flow control: %s",
336 status ? "failed" : "success");
337
338 /* Clear RTS to prevent the device from sending */
339 /* Most UARTs need OUT2 to enable interrupts */
340 status = tty->driver->ops->tiocmget(tty);
341 BT_DBG("Current tiocm 0x%x", status);
342
343 set &= ~(TIOCM_OUT2 | TIOCM_RTS);
344 clear = ~set;
345 set &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
346 TIOCM_OUT2 | TIOCM_LOOP;
347 clear &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
348 TIOCM_OUT2 | TIOCM_LOOP;
349 status = tty->driver->ops->tiocmset(tty, set, clear);
350 BT_DBG("Clearing RTS: %s", status ? "failed" : "success");
351 } else {
352 /* Set RTS to allow the device to send again */
353 status = tty->driver->ops->tiocmget(tty);
354 BT_DBG("Current tiocm 0x%x", status);
355
356 set |= (TIOCM_OUT2 | TIOCM_RTS);
357 clear = ~set;
358 set &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
359 TIOCM_OUT2 | TIOCM_LOOP;
360 clear &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
361 TIOCM_OUT2 | TIOCM_LOOP;
362 status = tty->driver->ops->tiocmset(tty, set, clear);
363 BT_DBG("Setting RTS: %s", status ? "failed" : "success");
364
365 /* Re-enable hardware flow control */
366 ktermios = tty->termios;
367 ktermios.c_cflag |= CRTSCTS;
368 status = tty_set_termios(tty, &ktermios);
369 BT_DBG("Enabling hardware flow control: %s",
370 status ? "failed" : "success");
371 }
372 }
373
hci_uart_set_speeds(struct hci_uart * hu,unsigned int init_speed,unsigned int oper_speed)374 void hci_uart_set_speeds(struct hci_uart *hu, unsigned int init_speed,
375 unsigned int oper_speed)
376 {
377 hu->init_speed = init_speed;
378 hu->oper_speed = oper_speed;
379 }
380
hci_uart_set_baudrate(struct hci_uart * hu,unsigned int speed)381 void hci_uart_set_baudrate(struct hci_uart *hu, unsigned int speed)
382 {
383 struct tty_struct *tty = hu->tty;
384 struct ktermios ktermios;
385
386 ktermios = tty->termios;
387 ktermios.c_cflag &= ~CBAUD;
388 tty_termios_encode_baud_rate(&ktermios, speed, speed);
389
390 /* tty_set_termios() return not checked as it is always 0 */
391 tty_set_termios(tty, &ktermios);
392
393 BT_DBG("%s: New tty speeds: %d/%d", hu->hdev->name,
394 tty->termios.c_ispeed, tty->termios.c_ospeed);
395 }
396
hci_uart_setup(struct hci_dev * hdev)397 static int hci_uart_setup(struct hci_dev *hdev)
398 {
399 struct hci_uart *hu = hci_get_drvdata(hdev);
400 struct hci_rp_read_local_version *ver;
401 struct sk_buff *skb;
402 unsigned int speed;
403 int err;
404
405 /* Init speed if any */
406 if (hu->init_speed)
407 speed = hu->init_speed;
408 else if (hu->proto->init_speed)
409 speed = hu->proto->init_speed;
410 else
411 speed = 0;
412
413 if (speed)
414 hci_uart_set_baudrate(hu, speed);
415
416 /* Operational speed if any */
417 if (hu->oper_speed)
418 speed = hu->oper_speed;
419 else if (hu->proto->oper_speed)
420 speed = hu->proto->oper_speed;
421 else
422 speed = 0;
423
424 if (hu->proto->set_baudrate && speed) {
425 err = hu->proto->set_baudrate(hu, speed);
426 if (!err)
427 hci_uart_set_baudrate(hu, speed);
428 }
429
430 if (hu->proto->setup)
431 return hu->proto->setup(hu);
432
433 if (!test_bit(HCI_UART_VND_DETECT, &hu->hdev_flags))
434 return 0;
435
436 skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_VERSION, 0, NULL,
437 HCI_INIT_TIMEOUT);
438 if (IS_ERR(skb)) {
439 BT_ERR("%s: Reading local version information failed (%ld)",
440 hdev->name, PTR_ERR(skb));
441 return 0;
442 }
443
444 if (skb->len != sizeof(*ver)) {
445 BT_ERR("%s: Event length mismatch for version information",
446 hdev->name);
447 goto done;
448 }
449
450 ver = (struct hci_rp_read_local_version *)skb->data;
451
452 switch (le16_to_cpu(ver->manufacturer)) {
453 #ifdef CONFIG_BT_HCIUART_INTEL
454 case 2:
455 hdev->set_bdaddr = btintel_set_bdaddr;
456 btintel_check_bdaddr(hdev);
457 break;
458 #endif
459 #ifdef CONFIG_BT_HCIUART_BCM
460 case 15:
461 hdev->set_bdaddr = btbcm_set_bdaddr;
462 btbcm_check_bdaddr(hdev);
463 break;
464 #endif
465 default:
466 break;
467 }
468
469 done:
470 kfree_skb(skb);
471 return 0;
472 }
473
474 /* ------ LDISC part ------ */
475 /* hci_uart_tty_open
476 *
477 * Called when line discipline changed to HCI_UART.
478 *
479 * Arguments:
480 * tty pointer to tty info structure
481 * Return Value:
482 * 0 if success, otherwise error code
483 */
hci_uart_tty_open(struct tty_struct * tty)484 static int hci_uart_tty_open(struct tty_struct *tty)
485 {
486 struct hci_uart *hu;
487
488 BT_DBG("tty %p", tty);
489
490 /* Error if the tty has no write op instead of leaving an exploitable
491 * hole
492 */
493 if (tty->ops->write == NULL)
494 return -EOPNOTSUPP;
495
496 hu = kzalloc(sizeof(struct hci_uart), GFP_KERNEL);
497 if (!hu) {
498 BT_ERR("Can't allocate control structure");
499 return -ENFILE;
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 percpu_init_rwsem(&hu->proto_lock);
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 __user * buf,size_t nr)811 static ssize_t hci_uart_tty_read(struct tty_struct *tty, struct file *file,
812 unsigned char __user *buf, size_t nr)
813 {
814 return 0;
815 }
816
hci_uart_tty_write(struct tty_struct * tty,struct file * file,const unsigned char * data,size_t count)817 static ssize_t hci_uart_tty_write(struct tty_struct *tty, struct file *file,
818 const unsigned char *data, size_t count)
819 {
820 return 0;
821 }
822
hci_uart_tty_poll(struct tty_struct * tty,struct file * filp,poll_table * wait)823 static __poll_t hci_uart_tty_poll(struct tty_struct *tty,
824 struct file *filp, poll_table *wait)
825 {
826 return 0;
827 }
828
hci_uart_init(void)829 static int __init hci_uart_init(void)
830 {
831 static struct tty_ldisc_ops hci_uart_ldisc;
832 int err;
833
834 BT_INFO("HCI UART driver ver %s", VERSION);
835
836 /* Register the tty discipline */
837
838 memset(&hci_uart_ldisc, 0, sizeof(hci_uart_ldisc));
839 hci_uart_ldisc.magic = TTY_LDISC_MAGIC;
840 hci_uart_ldisc.name = "n_hci";
841 hci_uart_ldisc.open = hci_uart_tty_open;
842 hci_uart_ldisc.close = hci_uart_tty_close;
843 hci_uart_ldisc.read = hci_uart_tty_read;
844 hci_uart_ldisc.write = hci_uart_tty_write;
845 hci_uart_ldisc.ioctl = hci_uart_tty_ioctl;
846 hci_uart_ldisc.poll = hci_uart_tty_poll;
847 hci_uart_ldisc.receive_buf = hci_uart_tty_receive;
848 hci_uart_ldisc.write_wakeup = hci_uart_tty_wakeup;
849 hci_uart_ldisc.owner = THIS_MODULE;
850
851 err = tty_register_ldisc(N_HCI, &hci_uart_ldisc);
852 if (err) {
853 BT_ERR("HCI line discipline registration failed. (%d)", err);
854 return err;
855 }
856
857 #ifdef CONFIG_BT_HCIUART_H4
858 h4_init();
859 #endif
860 #ifdef CONFIG_BT_HCIUART_BCSP
861 bcsp_init();
862 #endif
863 #ifdef CONFIG_BT_HCIUART_LL
864 ll_init();
865 #endif
866 #ifdef CONFIG_BT_HCIUART_ATH3K
867 ath_init();
868 #endif
869 #ifdef CONFIG_BT_HCIUART_3WIRE
870 h5_init();
871 #endif
872 #ifdef CONFIG_BT_HCIUART_INTEL
873 intel_init();
874 #endif
875 #ifdef CONFIG_BT_HCIUART_BCM
876 bcm_init();
877 #endif
878 #ifdef CONFIG_BT_HCIUART_QCA
879 qca_init();
880 #endif
881 #ifdef CONFIG_BT_HCIUART_AG6XX
882 ag6xx_init();
883 #endif
884 #ifdef CONFIG_BT_HCIUART_MRVL
885 mrvl_init();
886 #endif
887
888 return 0;
889 }
890
hci_uart_exit(void)891 static void __exit hci_uart_exit(void)
892 {
893 int err;
894
895 #ifdef CONFIG_BT_HCIUART_H4
896 h4_deinit();
897 #endif
898 #ifdef CONFIG_BT_HCIUART_BCSP
899 bcsp_deinit();
900 #endif
901 #ifdef CONFIG_BT_HCIUART_LL
902 ll_deinit();
903 #endif
904 #ifdef CONFIG_BT_HCIUART_ATH3K
905 ath_deinit();
906 #endif
907 #ifdef CONFIG_BT_HCIUART_3WIRE
908 h5_deinit();
909 #endif
910 #ifdef CONFIG_BT_HCIUART_INTEL
911 intel_deinit();
912 #endif
913 #ifdef CONFIG_BT_HCIUART_BCM
914 bcm_deinit();
915 #endif
916 #ifdef CONFIG_BT_HCIUART_QCA
917 qca_deinit();
918 #endif
919 #ifdef CONFIG_BT_HCIUART_AG6XX
920 ag6xx_deinit();
921 #endif
922 #ifdef CONFIG_BT_HCIUART_MRVL
923 mrvl_deinit();
924 #endif
925
926 /* Release tty registration of line discipline */
927 err = tty_unregister_ldisc(N_HCI);
928 if (err)
929 BT_ERR("Can't unregister HCI line discipline (%d)", err);
930 }
931
932 module_init(hci_uart_init);
933 module_exit(hci_uart_exit);
934
935 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
936 MODULE_DESCRIPTION("Bluetooth HCI UART driver ver " VERSION);
937 MODULE_VERSION(VERSION);
938 MODULE_LICENSE("GPL");
939 MODULE_ALIAS_LDISC(N_HCI);
940