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
45 #include <net/bluetooth/bluetooth.h>
46 #include <net/bluetooth/hci_core.h>
47
48 #include "btintel.h"
49 #include "btbcm.h"
50 #include "hci_uart.h"
51
52 #define VERSION "2.3"
53
54 static const struct hci_uart_proto *hup[HCI_UART_MAX_PROTO];
55
hci_uart_register_proto(const struct hci_uart_proto * p)56 int hci_uart_register_proto(const struct hci_uart_proto *p)
57 {
58 if (p->id >= HCI_UART_MAX_PROTO)
59 return -EINVAL;
60
61 if (hup[p->id])
62 return -EEXIST;
63
64 hup[p->id] = p;
65
66 BT_INFO("HCI UART protocol %s registered", p->name);
67
68 return 0;
69 }
70
hci_uart_unregister_proto(const struct hci_uart_proto * p)71 int hci_uart_unregister_proto(const struct hci_uart_proto *p)
72 {
73 if (p->id >= HCI_UART_MAX_PROTO)
74 return -EINVAL;
75
76 if (!hup[p->id])
77 return -EINVAL;
78
79 hup[p->id] = NULL;
80
81 return 0;
82 }
83
hci_uart_get_proto(unsigned int id)84 static const struct hci_uart_proto *hci_uart_get_proto(unsigned int id)
85 {
86 if (id >= HCI_UART_MAX_PROTO)
87 return NULL;
88
89 return hup[id];
90 }
91
hci_uart_tx_complete(struct hci_uart * hu,int pkt_type)92 static inline void hci_uart_tx_complete(struct hci_uart *hu, int pkt_type)
93 {
94 struct hci_dev *hdev = hu->hdev;
95
96 /* Update HCI stat counters */
97 switch (pkt_type) {
98 case HCI_COMMAND_PKT:
99 hdev->stat.cmd_tx++;
100 break;
101
102 case HCI_ACLDATA_PKT:
103 hdev->stat.acl_tx++;
104 break;
105
106 case HCI_SCODATA_PKT:
107 hdev->stat.sco_tx++;
108 break;
109 }
110 }
111
hci_uart_dequeue(struct hci_uart * hu)112 static inline struct sk_buff *hci_uart_dequeue(struct hci_uart *hu)
113 {
114 struct sk_buff *skb = hu->tx_skb;
115
116 if (!skb)
117 skb = hu->proto->dequeue(hu);
118 else
119 hu->tx_skb = NULL;
120
121 return skb;
122 }
123
hci_uart_tx_wakeup(struct hci_uart * hu)124 int hci_uart_tx_wakeup(struct hci_uart *hu)
125 {
126 if (test_and_set_bit(HCI_UART_SENDING, &hu->tx_state)) {
127 set_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
128 return 0;
129 }
130
131 BT_DBG("");
132
133 schedule_work(&hu->write_work);
134
135 return 0;
136 }
137
hci_uart_write_work(struct work_struct * work)138 static void hci_uart_write_work(struct work_struct *work)
139 {
140 struct hci_uart *hu = container_of(work, struct hci_uart, write_work);
141 struct tty_struct *tty = hu->tty;
142 struct hci_dev *hdev = hu->hdev;
143 struct sk_buff *skb;
144
145 /* REVISIT: should we cope with bad skbs or ->write() returning
146 * and error value ?
147 */
148
149 restart:
150 clear_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
151
152 while ((skb = hci_uart_dequeue(hu))) {
153 int len;
154
155 set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
156 len = tty->ops->write(tty, skb->data, skb->len);
157 hdev->stat.byte_tx += len;
158
159 skb_pull(skb, len);
160 if (skb->len) {
161 hu->tx_skb = skb;
162 break;
163 }
164
165 hci_uart_tx_complete(hu, bt_cb(skb)->pkt_type);
166 kfree_skb(skb);
167 }
168
169 if (test_bit(HCI_UART_TX_WAKEUP, &hu->tx_state))
170 goto restart;
171
172 clear_bit(HCI_UART_SENDING, &hu->tx_state);
173 }
174
hci_uart_init_work(struct work_struct * work)175 static void hci_uart_init_work(struct work_struct *work)
176 {
177 struct hci_uart *hu = container_of(work, struct hci_uart, init_ready);
178 int err;
179
180 if (!test_and_clear_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
181 return;
182
183 err = hci_register_dev(hu->hdev);
184 if (err < 0) {
185 BT_ERR("Can't register HCI device");
186 hci_free_dev(hu->hdev);
187 hu->hdev = NULL;
188 hu->proto->close(hu);
189 }
190
191 set_bit(HCI_UART_REGISTERED, &hu->flags);
192 }
193
hci_uart_init_ready(struct hci_uart * hu)194 int hci_uart_init_ready(struct hci_uart *hu)
195 {
196 if (!test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
197 return -EALREADY;
198
199 schedule_work(&hu->init_ready);
200
201 return 0;
202 }
203
204 /* ------- Interface to HCI layer ------ */
205 /* Initialize device */
hci_uart_open(struct hci_dev * hdev)206 static int hci_uart_open(struct hci_dev *hdev)
207 {
208 BT_DBG("%s %p", hdev->name, hdev);
209
210 /* Nothing to do for UART driver */
211 return 0;
212 }
213
214 /* Reset device */
hci_uart_flush(struct hci_dev * hdev)215 static int hci_uart_flush(struct hci_dev *hdev)
216 {
217 struct hci_uart *hu = hci_get_drvdata(hdev);
218 struct tty_struct *tty = hu->tty;
219
220 BT_DBG("hdev %p tty %p", hdev, tty);
221
222 if (hu->tx_skb) {
223 kfree_skb(hu->tx_skb); hu->tx_skb = NULL;
224 }
225
226 /* Flush any pending characters in the driver and discipline. */
227 tty_ldisc_flush(tty);
228 tty_driver_flush_buffer(tty);
229
230 if (test_bit(HCI_UART_PROTO_READY, &hu->flags))
231 hu->proto->flush(hu);
232
233 return 0;
234 }
235
236 /* Close device */
hci_uart_close(struct hci_dev * hdev)237 static int hci_uart_close(struct hci_dev *hdev)
238 {
239 BT_DBG("hdev %p", hdev);
240
241 hci_uart_flush(hdev);
242 hdev->flush = NULL;
243 return 0;
244 }
245
246 /* Send frames from HCI layer */
hci_uart_send_frame(struct hci_dev * hdev,struct sk_buff * skb)247 static int hci_uart_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
248 {
249 struct hci_uart *hu = hci_get_drvdata(hdev);
250
251 BT_DBG("%s: type %d len %d", hdev->name, bt_cb(skb)->pkt_type, skb->len);
252
253 hu->proto->enqueue(hu, skb);
254
255 hci_uart_tx_wakeup(hu);
256
257 return 0;
258 }
259
260 /* Check the underlying device or tty has flow control support */
hci_uart_has_flow_control(struct hci_uart * hu)261 bool hci_uart_has_flow_control(struct hci_uart *hu)
262 {
263 if (hu->tty->driver->ops->tiocmget && hu->tty->driver->ops->tiocmset)
264 return true;
265
266 return false;
267 }
268
269 /* Flow control or un-flow control the device */
hci_uart_set_flow_control(struct hci_uart * hu,bool enable)270 void hci_uart_set_flow_control(struct hci_uart *hu, bool enable)
271 {
272 struct tty_struct *tty = hu->tty;
273 struct ktermios ktermios;
274 int status;
275 unsigned int set = 0;
276 unsigned int clear = 0;
277
278 if (enable) {
279 /* Disable hardware flow control */
280 ktermios = tty->termios;
281 ktermios.c_cflag &= ~CRTSCTS;
282 status = tty_set_termios(tty, &ktermios);
283 BT_DBG("Disabling hardware flow control: %s",
284 status ? "failed" : "success");
285
286 /* Clear RTS to prevent the device from sending */
287 /* Most UARTs need OUT2 to enable interrupts */
288 status = tty->driver->ops->tiocmget(tty);
289 BT_DBG("Current tiocm 0x%x", status);
290
291 set &= ~(TIOCM_OUT2 | TIOCM_RTS);
292 clear = ~set;
293 set &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
294 TIOCM_OUT2 | TIOCM_LOOP;
295 clear &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
296 TIOCM_OUT2 | TIOCM_LOOP;
297 status = tty->driver->ops->tiocmset(tty, set, clear);
298 BT_DBG("Clearing RTS: %s", status ? "failed" : "success");
299 } else {
300 /* Set RTS to allow the device to send again */
301 status = tty->driver->ops->tiocmget(tty);
302 BT_DBG("Current tiocm 0x%x", status);
303
304 set |= (TIOCM_OUT2 | TIOCM_RTS);
305 clear = ~set;
306 set &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
307 TIOCM_OUT2 | TIOCM_LOOP;
308 clear &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
309 TIOCM_OUT2 | TIOCM_LOOP;
310 status = tty->driver->ops->tiocmset(tty, set, clear);
311 BT_DBG("Setting RTS: %s", status ? "failed" : "success");
312
313 /* Re-enable hardware flow control */
314 ktermios = tty->termios;
315 ktermios.c_cflag |= CRTSCTS;
316 status = tty_set_termios(tty, &ktermios);
317 BT_DBG("Enabling hardware flow control: %s",
318 status ? "failed" : "success");
319 }
320 }
321
hci_uart_set_speeds(struct hci_uart * hu,unsigned int init_speed,unsigned int oper_speed)322 void hci_uart_set_speeds(struct hci_uart *hu, unsigned int init_speed,
323 unsigned int oper_speed)
324 {
325 hu->init_speed = init_speed;
326 hu->oper_speed = oper_speed;
327 }
328
hci_uart_init_tty(struct hci_uart * hu)329 void hci_uart_init_tty(struct hci_uart *hu)
330 {
331 struct tty_struct *tty = hu->tty;
332 struct ktermios ktermios;
333
334 /* Bring the UART into a known 8 bits no parity hw fc state */
335 ktermios = tty->termios;
336 ktermios.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP |
337 INLCR | IGNCR | ICRNL | IXON);
338 ktermios.c_oflag &= ~OPOST;
339 ktermios.c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
340 ktermios.c_cflag &= ~(CSIZE | PARENB);
341 ktermios.c_cflag |= CS8;
342 ktermios.c_cflag |= CRTSCTS;
343
344 /* tty_set_termios() return not checked as it is always 0 */
345 tty_set_termios(tty, &ktermios);
346 }
347
hci_uart_set_baudrate(struct hci_uart * hu,unsigned int speed)348 void hci_uart_set_baudrate(struct hci_uart *hu, unsigned int speed)
349 {
350 struct tty_struct *tty = hu->tty;
351 struct ktermios ktermios;
352
353 ktermios = tty->termios;
354 ktermios.c_cflag &= ~CBAUD;
355 tty_termios_encode_baud_rate(&ktermios, speed, speed);
356
357 /* tty_set_termios() return not checked as it is always 0 */
358 tty_set_termios(tty, &ktermios);
359
360 BT_DBG("%s: New tty speeds: %d/%d", hu->hdev->name,
361 tty->termios.c_ispeed, tty->termios.c_ospeed);
362 }
363
hci_uart_setup(struct hci_dev * hdev)364 static int hci_uart_setup(struct hci_dev *hdev)
365 {
366 struct hci_uart *hu = hci_get_drvdata(hdev);
367 struct hci_rp_read_local_version *ver;
368 struct sk_buff *skb;
369 unsigned int speed;
370 int err;
371
372 /* Init speed if any */
373 if (hu->init_speed)
374 speed = hu->init_speed;
375 else if (hu->proto->init_speed)
376 speed = hu->proto->init_speed;
377 else
378 speed = 0;
379
380 if (speed)
381 hci_uart_set_baudrate(hu, speed);
382
383 /* Operational speed if any */
384 if (hu->oper_speed)
385 speed = hu->oper_speed;
386 else if (hu->proto->oper_speed)
387 speed = hu->proto->oper_speed;
388 else
389 speed = 0;
390
391 if (hu->proto->set_baudrate && speed) {
392 err = hu->proto->set_baudrate(hu, speed);
393 if (!err)
394 hci_uart_set_baudrate(hu, speed);
395 }
396
397 if (hu->proto->setup)
398 return hu->proto->setup(hu);
399
400 if (!test_bit(HCI_UART_VND_DETECT, &hu->hdev_flags))
401 return 0;
402
403 skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_VERSION, 0, NULL,
404 HCI_INIT_TIMEOUT);
405 if (IS_ERR(skb)) {
406 BT_ERR("%s: Reading local version information failed (%ld)",
407 hdev->name, PTR_ERR(skb));
408 return 0;
409 }
410
411 if (skb->len != sizeof(*ver)) {
412 BT_ERR("%s: Event length mismatch for version information",
413 hdev->name);
414 goto done;
415 }
416
417 ver = (struct hci_rp_read_local_version *)skb->data;
418
419 switch (le16_to_cpu(ver->manufacturer)) {
420 #ifdef CONFIG_BT_HCIUART_INTEL
421 case 2:
422 hdev->set_bdaddr = btintel_set_bdaddr;
423 btintel_check_bdaddr(hdev);
424 break;
425 #endif
426 #ifdef CONFIG_BT_HCIUART_BCM
427 case 15:
428 hdev->set_bdaddr = btbcm_set_bdaddr;
429 btbcm_check_bdaddr(hdev);
430 break;
431 #endif
432 }
433
434 done:
435 kfree_skb(skb);
436 return 0;
437 }
438
439 /* ------ LDISC part ------ */
440 /* hci_uart_tty_open
441 *
442 * Called when line discipline changed to HCI_UART.
443 *
444 * Arguments:
445 * tty pointer to tty info structure
446 * Return Value:
447 * 0 if success, otherwise error code
448 */
hci_uart_tty_open(struct tty_struct * tty)449 static int hci_uart_tty_open(struct tty_struct *tty)
450 {
451 struct hci_uart *hu;
452
453 BT_DBG("tty %p", tty);
454
455 /* Error if the tty has no write op instead of leaving an exploitable
456 hole */
457 if (tty->ops->write == NULL)
458 return -EOPNOTSUPP;
459
460 hu = kzalloc(sizeof(struct hci_uart), GFP_KERNEL);
461 if (!hu) {
462 BT_ERR("Can't allocate control structure");
463 return -ENFILE;
464 }
465
466 tty->disc_data = hu;
467 hu->tty = tty;
468 tty->receive_room = 65536;
469
470 INIT_WORK(&hu->init_ready, hci_uart_init_work);
471 INIT_WORK(&hu->write_work, hci_uart_write_work);
472
473 /* Flush any pending characters in the driver and line discipline. */
474
475 /* FIXME: why is this needed. Note don't use ldisc_ref here as the
476 open path is before the ldisc is referencable */
477
478 if (tty->ldisc->ops->flush_buffer)
479 tty->ldisc->ops->flush_buffer(tty);
480 tty_driver_flush_buffer(tty);
481
482 return 0;
483 }
484
485 /* hci_uart_tty_close()
486 *
487 * Called when the line discipline is changed to something
488 * else, the tty is closed, or the tty detects a hangup.
489 */
hci_uart_tty_close(struct tty_struct * tty)490 static void hci_uart_tty_close(struct tty_struct *tty)
491 {
492 struct hci_uart *hu = tty->disc_data;
493 struct hci_dev *hdev;
494
495 BT_DBG("tty %p", tty);
496
497 /* Detach from the tty */
498 tty->disc_data = NULL;
499
500 if (!hu)
501 return;
502
503 hdev = hu->hdev;
504 if (hdev)
505 hci_uart_close(hdev);
506
507 cancel_work_sync(&hu->write_work);
508
509 if (test_and_clear_bit(HCI_UART_PROTO_READY, &hu->flags)) {
510 if (hdev) {
511 if (test_bit(HCI_UART_REGISTERED, &hu->flags))
512 hci_unregister_dev(hdev);
513 hci_free_dev(hdev);
514 }
515 hu->proto->close(hu);
516 }
517 clear_bit(HCI_UART_PROTO_SET, &hu->flags);
518
519 kfree(hu);
520 }
521
522 /* hci_uart_tty_wakeup()
523 *
524 * Callback for transmit wakeup. Called when low level
525 * device driver can accept more send data.
526 *
527 * Arguments: tty pointer to associated tty instance data
528 * Return Value: None
529 */
hci_uart_tty_wakeup(struct tty_struct * tty)530 static void hci_uart_tty_wakeup(struct tty_struct *tty)
531 {
532 struct hci_uart *hu = tty->disc_data;
533
534 BT_DBG("");
535
536 if (!hu)
537 return;
538
539 clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
540
541 if (tty != hu->tty)
542 return;
543
544 if (test_bit(HCI_UART_PROTO_READY, &hu->flags))
545 hci_uart_tx_wakeup(hu);
546 }
547
548 /* hci_uart_tty_receive()
549 *
550 * Called by tty low level driver when receive data is
551 * available.
552 *
553 * Arguments: tty pointer to tty isntance data
554 * data pointer to received data
555 * flags pointer to flags for data
556 * count count of received data in bytes
557 *
558 * Return Value: None
559 */
hci_uart_tty_receive(struct tty_struct * tty,const u8 * data,char * flags,int count)560 static void hci_uart_tty_receive(struct tty_struct *tty, const u8 *data,
561 char *flags, int count)
562 {
563 struct hci_uart *hu = tty->disc_data;
564
565 if (!hu || tty != hu->tty)
566 return;
567
568 if (!test_bit(HCI_UART_PROTO_READY, &hu->flags))
569 return;
570
571 /* It does not need a lock here as it is already protected by a mutex in
572 * tty caller
573 */
574 hu->proto->recv(hu, data, count);
575
576 if (hu->hdev)
577 hu->hdev->stat.byte_rx += count;
578
579 tty_unthrottle(tty);
580 }
581
hci_uart_register_dev(struct hci_uart * hu)582 static int hci_uart_register_dev(struct hci_uart *hu)
583 {
584 struct hci_dev *hdev;
585
586 BT_DBG("");
587
588 /* Initialize and register HCI device */
589 hdev = hci_alloc_dev();
590 if (!hdev) {
591 BT_ERR("Can't allocate HCI device");
592 return -ENOMEM;
593 }
594
595 hu->hdev = hdev;
596
597 hdev->bus = HCI_UART;
598 hci_set_drvdata(hdev, hu);
599
600 /* Only when vendor specific setup callback is provided, consider
601 * the manufacturer information valid. This avoids filling in the
602 * value for Ericsson when nothing is specified.
603 */
604 if (hu->proto->setup)
605 hdev->manufacturer = hu->proto->manufacturer;
606
607 hdev->open = hci_uart_open;
608 hdev->close = hci_uart_close;
609 hdev->flush = hci_uart_flush;
610 hdev->send = hci_uart_send_frame;
611 hdev->setup = hci_uart_setup;
612 SET_HCIDEV_DEV(hdev, hu->tty->dev);
613
614 if (test_bit(HCI_UART_RAW_DEVICE, &hu->hdev_flags))
615 set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks);
616
617 if (test_bit(HCI_UART_EXT_CONFIG, &hu->hdev_flags))
618 set_bit(HCI_QUIRK_EXTERNAL_CONFIG, &hdev->quirks);
619
620 if (!test_bit(HCI_UART_RESET_ON_INIT, &hu->hdev_flags))
621 set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);
622
623 if (test_bit(HCI_UART_CREATE_AMP, &hu->hdev_flags))
624 hdev->dev_type = HCI_AMP;
625 else
626 hdev->dev_type = HCI_BREDR;
627
628 if (test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
629 return 0;
630
631 if (hci_register_dev(hdev) < 0) {
632 BT_ERR("Can't register HCI device");
633 hci_free_dev(hdev);
634 return -ENODEV;
635 }
636
637 set_bit(HCI_UART_REGISTERED, &hu->flags);
638
639 return 0;
640 }
641
hci_uart_set_proto(struct hci_uart * hu,int id)642 static int hci_uart_set_proto(struct hci_uart *hu, int id)
643 {
644 const struct hci_uart_proto *p;
645 int err;
646
647 p = hci_uart_get_proto(id);
648 if (!p)
649 return -EPROTONOSUPPORT;
650
651 err = p->open(hu);
652 if (err)
653 return err;
654
655 hu->proto = p;
656
657 err = hci_uart_register_dev(hu);
658 if (err) {
659 p->close(hu);
660 return err;
661 }
662
663 set_bit(HCI_UART_PROTO_READY, &hu->flags);
664 return 0;
665 }
666
hci_uart_set_flags(struct hci_uart * hu,unsigned long flags)667 static int hci_uart_set_flags(struct hci_uart *hu, unsigned long flags)
668 {
669 unsigned long valid_flags = BIT(HCI_UART_RAW_DEVICE) |
670 BIT(HCI_UART_RESET_ON_INIT) |
671 BIT(HCI_UART_CREATE_AMP) |
672 BIT(HCI_UART_INIT_PENDING) |
673 BIT(HCI_UART_EXT_CONFIG) |
674 BIT(HCI_UART_VND_DETECT);
675
676 if (flags & ~valid_flags)
677 return -EINVAL;
678
679 hu->hdev_flags = flags;
680
681 return 0;
682 }
683
684 /* hci_uart_tty_ioctl()
685 *
686 * Process IOCTL system call for the tty device.
687 *
688 * Arguments:
689 *
690 * tty pointer to tty instance data
691 * file pointer to open file object for device
692 * cmd IOCTL command code
693 * arg argument for IOCTL call (cmd dependent)
694 *
695 * Return Value: Command dependent
696 */
hci_uart_tty_ioctl(struct tty_struct * tty,struct file * file,unsigned int cmd,unsigned long arg)697 static int hci_uart_tty_ioctl(struct tty_struct *tty, struct file *file,
698 unsigned int cmd, unsigned long arg)
699 {
700 struct hci_uart *hu = tty->disc_data;
701 int err = 0;
702
703 BT_DBG("");
704
705 /* Verify the status of the device */
706 if (!hu)
707 return -EBADF;
708
709 switch (cmd) {
710 case HCIUARTSETPROTO:
711 if (!test_and_set_bit(HCI_UART_PROTO_SET, &hu->flags)) {
712 err = hci_uart_set_proto(hu, arg);
713 if (err) {
714 clear_bit(HCI_UART_PROTO_SET, &hu->flags);
715 return err;
716 }
717 } else
718 return -EBUSY;
719 break;
720
721 case HCIUARTGETPROTO:
722 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
723 return hu->proto->id;
724 return -EUNATCH;
725
726 case HCIUARTGETDEVICE:
727 if (test_bit(HCI_UART_REGISTERED, &hu->flags))
728 return hu->hdev->id;
729 return -EUNATCH;
730
731 case HCIUARTSETFLAGS:
732 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
733 return -EBUSY;
734 err = hci_uart_set_flags(hu, arg);
735 if (err)
736 return err;
737 break;
738
739 case HCIUARTGETFLAGS:
740 return hu->hdev_flags;
741
742 default:
743 err = n_tty_ioctl_helper(tty, file, cmd, arg);
744 break;
745 }
746
747 return err;
748 }
749
750 /*
751 * We don't provide read/write/poll interface for user space.
752 */
hci_uart_tty_read(struct tty_struct * tty,struct file * file,unsigned char __user * buf,size_t nr)753 static ssize_t hci_uart_tty_read(struct tty_struct *tty, struct file *file,
754 unsigned char __user *buf, size_t nr)
755 {
756 return 0;
757 }
758
hci_uart_tty_write(struct tty_struct * tty,struct file * file,const unsigned char * data,size_t count)759 static ssize_t hci_uart_tty_write(struct tty_struct *tty, struct file *file,
760 const unsigned char *data, size_t count)
761 {
762 return 0;
763 }
764
hci_uart_tty_poll(struct tty_struct * tty,struct file * filp,poll_table * wait)765 static unsigned int hci_uart_tty_poll(struct tty_struct *tty,
766 struct file *filp, poll_table *wait)
767 {
768 return 0;
769 }
770
hci_uart_init(void)771 static int __init hci_uart_init(void)
772 {
773 static struct tty_ldisc_ops hci_uart_ldisc;
774 int err;
775
776 BT_INFO("HCI UART driver ver %s", VERSION);
777
778 /* Register the tty discipline */
779
780 memset(&hci_uart_ldisc, 0, sizeof(hci_uart_ldisc));
781 hci_uart_ldisc.magic = TTY_LDISC_MAGIC;
782 hci_uart_ldisc.name = "n_hci";
783 hci_uart_ldisc.open = hci_uart_tty_open;
784 hci_uart_ldisc.close = hci_uart_tty_close;
785 hci_uart_ldisc.read = hci_uart_tty_read;
786 hci_uart_ldisc.write = hci_uart_tty_write;
787 hci_uart_ldisc.ioctl = hci_uart_tty_ioctl;
788 hci_uart_ldisc.poll = hci_uart_tty_poll;
789 hci_uart_ldisc.receive_buf = hci_uart_tty_receive;
790 hci_uart_ldisc.write_wakeup = hci_uart_tty_wakeup;
791 hci_uart_ldisc.owner = THIS_MODULE;
792
793 err = tty_register_ldisc(N_HCI, &hci_uart_ldisc);
794 if (err) {
795 BT_ERR("HCI line discipline registration failed. (%d)", err);
796 return err;
797 }
798
799 #ifdef CONFIG_BT_HCIUART_H4
800 h4_init();
801 #endif
802 #ifdef CONFIG_BT_HCIUART_BCSP
803 bcsp_init();
804 #endif
805 #ifdef CONFIG_BT_HCIUART_LL
806 ll_init();
807 #endif
808 #ifdef CONFIG_BT_HCIUART_ATH3K
809 ath_init();
810 #endif
811 #ifdef CONFIG_BT_HCIUART_3WIRE
812 h5_init();
813 #endif
814 #ifdef CONFIG_BT_HCIUART_INTEL
815 intel_init();
816 #endif
817 #ifdef CONFIG_BT_HCIUART_BCM
818 bcm_init();
819 #endif
820 #ifdef CONFIG_BT_HCIUART_QCA
821 qca_init();
822 #endif
823
824 return 0;
825 }
826
hci_uart_exit(void)827 static void __exit hci_uart_exit(void)
828 {
829 int err;
830
831 #ifdef CONFIG_BT_HCIUART_H4
832 h4_deinit();
833 #endif
834 #ifdef CONFIG_BT_HCIUART_BCSP
835 bcsp_deinit();
836 #endif
837 #ifdef CONFIG_BT_HCIUART_LL
838 ll_deinit();
839 #endif
840 #ifdef CONFIG_BT_HCIUART_ATH3K
841 ath_deinit();
842 #endif
843 #ifdef CONFIG_BT_HCIUART_3WIRE
844 h5_deinit();
845 #endif
846 #ifdef CONFIG_BT_HCIUART_INTEL
847 intel_deinit();
848 #endif
849 #ifdef CONFIG_BT_HCIUART_BCM
850 bcm_deinit();
851 #endif
852 #ifdef CONFIG_BT_HCIUART_QCA
853 qca_deinit();
854 #endif
855
856 /* Release tty registration of line discipline */
857 err = tty_unregister_ldisc(N_HCI);
858 if (err)
859 BT_ERR("Can't unregister HCI line discipline (%d)", err);
860 }
861
862 module_init(hci_uart_init);
863 module_exit(hci_uart_exit);
864
865 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
866 MODULE_DESCRIPTION("Bluetooth HCI UART driver ver " VERSION);
867 MODULE_VERSION(VERSION);
868 MODULE_LICENSE("GPL");
869 MODULE_ALIAS_LDISC(N_HCI);
870