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 #include <linux/kernel.h>
28 #include <linux/init.h>
29 #include <linux/types.h>
30 #include <linux/fcntl.h>
31 #include <linux/interrupt.h>
32 #include <linux/ptrace.h>
33 #include <linux/poll.h>
34 #include <linux/slab.h>
35 #include <linux/tty.h>
36 #include <linux/errno.h>
37 #include <linux/string.h>
38 #include <linux/signal.h>
39 #include <linux/ioctl.h>
40 #include <linux/skbuff.h>
41 #include <linux/version.h>
42 #include <net/bluetooth/bluetooth.h>
43 #include <net/bluetooth/hci_core.h>
44
45 #include "hci_uart.h"
46
47 #define NEW_TX_SCHED_POLICY
48
49 #if WOBT_NOTIFY
50 #include <linux/suspend.h>
51 #endif
52
53 #ifdef BTCOEX
54 #include "rtk_coex.h"
55 #endif
56
57 #define VERSION "2.2.3634cd9.20220519-142433"
58
59 #if HCI_VERSION_CODE > KERNEL_VERSION(3, 4, 0)
60 #define GET_DRV_DATA(x) hci_get_drvdata(x)
61 #else
62 #define GET_DRV_DATA(x) (struct hci_uart *)(x->driver_data)
63 #endif
64
65 #define SEMWAIT_TIMEOUT 50
66
67 #if WOBT_NOTIFY
68 struct hci_rsp_read_local {
69 __u8 status;
70 __u8 hci_ver;
71 __le16 hci_rev;
72 __u8 lmp_ver;
73 __le16 manufacturer;
74 __le16 lmp_subver;
75 } __packed;
76 #endif
77
78 #if HCI_VERSION_CODE < KERNEL_VERSION(3, 4, 0)
79 static int reset = 0;
80 #endif
81
82 static struct hci_uart_proto *hup[HCI_UART_MAX_PROTO];
83 static int hci_uart_flush(struct hci_dev *hdev);
84
hci_uart_register_proto(struct hci_uart_proto * p)85 int hci_uart_register_proto(struct hci_uart_proto *p)
86 {
87 if (p->id >= HCI_UART_MAX_PROTO)
88 return -EINVAL;
89
90 if (hup[p->id])
91 return -EEXIST;
92
93 hup[p->id] = p;
94
95 return 0;
96 }
97
hci_uart_unregister_proto(struct hci_uart_proto * p)98 int hci_uart_unregister_proto(struct hci_uart_proto *p)
99 {
100 if (p->id >= HCI_UART_MAX_PROTO)
101 return -EINVAL;
102
103 if (!hup[p->id])
104 return -EINVAL;
105
106 hup[p->id] = NULL;
107
108 return 0;
109 }
110
hci_uart_get_proto(unsigned int id)111 static struct hci_uart_proto *hci_uart_get_proto(unsigned int id)
112 {
113 if (id >= HCI_UART_MAX_PROTO)
114 return NULL;
115
116 return hup[id];
117 }
118
hci_uart_tx_complete(struct hci_uart * hu,int pkt_type)119 static inline void hci_uart_tx_complete(struct hci_uart *hu, int pkt_type)
120 {
121 struct hci_dev *hdev = hu->hdev;
122
123 /* Update HCI stat counters */
124 switch (pkt_type) {
125 case HCI_COMMAND_PKT:
126 hdev->stat.cmd_tx++;
127 break;
128
129 case HCI_ACLDATA_PKT:
130 hdev->stat.acl_tx++;
131 break;
132
133 case HCI_SCODATA_PKT:
134 hdev->stat.sco_tx++;
135 break;
136 }
137 }
138
hci_proto_read_lock(struct hci_uart * hu)139 static inline void hci_proto_read_lock(struct hci_uart *hu)
140 {
141 #if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 7, 0)
142 percpu_down_read(&hu->proto_lock);
143 #else
144 down_read(&hu->proto_lock);
145 #endif
146 }
147
hci_proto_read_trylock(struct hci_uart * hu)148 static inline int hci_proto_read_trylock(struct hci_uart *hu)
149 {
150 #if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 7, 0)
151 return percpu_down_read_trylock(&hu->proto_lock);
152 #else
153 return down_read_trylock(&hu->proto_lock);
154 #endif
155 }
156
hci_proto_read_unlock(struct hci_uart * hu)157 static inline void hci_proto_read_unlock(struct hci_uart *hu)
158 {
159 #if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 7, 0)
160 percpu_up_read(&hu->proto_lock);
161 #else
162 up_read(&hu->proto_lock);
163 #endif
164 }
165
hci_proto_write_lock(struct hci_uart * hu)166 static inline void hci_proto_write_lock(struct hci_uart *hu)
167 {
168 #if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 7, 0)
169 percpu_down_write(&hu->proto_lock);
170 #else
171 down_write(&hu->proto_lock);
172 #endif
173 }
174
hci_proto_write_unlock(struct hci_uart * hu)175 static inline void hci_proto_write_unlock(struct hci_uart *hu)
176 {
177 #if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 7, 0)
178 percpu_up_write(&hu->proto_lock);
179 #else
180 up_write(&hu->proto_lock);
181 #endif
182 }
183
hci_proto_init_rwlock(struct hci_uart * hu)184 static inline int hci_proto_init_rwlock(struct hci_uart *hu)
185 {
186 #if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 7, 0)
187 return percpu_init_rwsem(&hu->proto_lock);
188 #else
189 init_rwsem(&hu->proto_lock);
190 return 0;
191 #endif
192 }
193
hci_proto_free_rwlock(struct hci_uart * hu)194 static inline void hci_proto_free_rwlock(struct hci_uart *hu)
195 {
196 #if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 7, 0)
197 percpu_free_rwsem(&hu->proto_lock);
198 #endif
199 }
200
hci_uart_dequeue(struct hci_uart * hu)201 static inline struct sk_buff *hci_uart_dequeue(struct hci_uart *hu)
202 {
203 struct sk_buff *skb = hu->tx_skb;
204
205 if (!skb) {
206 hci_proto_read_lock(hu);
207
208 if (test_bit(HCI_UART_PROTO_READY, &hu->flags))
209 skb = hu->proto->dequeue(hu);
210
211 hci_proto_read_unlock(hu);
212 } else {
213 hu->tx_skb = NULL;
214 }
215
216 return skb;
217 }
218
219 /* This may be called in an IRQ context */
hci_uart_tx_wakeup(struct hci_uart * hu)220 int hci_uart_tx_wakeup(struct hci_uart *hu)
221 {
222 /* If acquiring lock fails we assume the tty is being closed because
223 * that is the only time the write lock is acquired. If, however,
224 * at some point in the future the write lock is also acquired in
225 * other situations, then this must be revisited.
226 */
227 if (!hci_proto_read_trylock(hu))
228 return 0;
229
230 /* proto_lock is locked */
231 if (!test_bit(HCI_UART_PROTO_READY, &hu->flags))
232 goto no_schedule;
233
234 #ifdef NEW_TX_SCHED_POLICY
235 set_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
236 if (test_and_set_bit(HCI_UART_SENDING, &hu->tx_state))
237 goto no_schedule;
238 #else
239 if (in_interrupt() || in_atomic()) {
240 if (test_and_set_bit(HCI_UART_SENDING, &hu->tx_state)) {
241 set_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
242 goto no_schedule;
243 }
244 } else {
245 /* NOTE: proto_lock can't be spin lock, because it may
246 * schedule here. Schedule is not allowed while atomic
247 */
248 if (down_timeout(&hu->tx_sem,
249 msecs_to_jiffies(SEMWAIT_TIMEOUT)) == -ETIME) {
250 pr_warn("%s: Something went wrong with wait\n",
251 __func__);
252 goto no_schedule;
253 }
254 /* semaphore is locked */
255 if (test_and_set_bit(HCI_UART_SENDING, &hu->tx_state)) {
256 set_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
257 up(&hu->tx_sem);
258 goto no_schedule;
259 }
260 up(&hu->tx_sem);
261 }
262 #endif
263
264 BT_DBG("");
265
266 schedule_work(&hu->write_work);
267
268 no_schedule:
269 hci_proto_read_unlock(hu);
270
271 return 0;
272 }
273
hci_uart_write_work(struct work_struct * work)274 static void hci_uart_write_work(struct work_struct *work)
275 {
276 struct hci_uart *hu = container_of(work, struct hci_uart, write_work);
277 struct tty_struct *tty = hu->tty;
278 struct hci_dev *hdev = hu->hdev;
279 struct sk_buff *skb;
280
281 /* REVISIT: should we cope with bad skbs or ->write() returning
282 * and error value ?
283 */
284
285 restart:
286 clear_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
287
288 while ((skb = hci_uart_dequeue(hu))) {
289 int len;
290
291 set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
292 len = tty->ops->write(tty, skb->data, skb->len);
293 hdev->stat.byte_tx += len;
294
295 skb_pull(skb, len);
296 if (skb->len) {
297 hu->tx_skb = skb;
298 break;
299 }
300
301 hci_uart_tx_complete(hu, bt_cb(skb)->pkt_type);
302 kfree_skb(skb);
303 }
304
305 #ifdef NEW_TX_SCHED_POLICY
306 clear_bit(HCI_UART_SENDING, &hu->tx_state);
307 if (test_bit(HCI_UART_TX_WAKEUP, &hu->tx_state))
308 goto restart;
309 #else
310 if (down_timeout(&hu->tx_sem, msecs_to_jiffies(SEMWAIT_TIMEOUT))) {
311 pr_warn("%s: Something went wrong with wait\n", __func__);
312 goto restart;
313 }
314 /* semaphore is locked */
315 if (test_bit(HCI_UART_TX_WAKEUP, &hu->tx_state)) {
316 up(&hu->tx_sem);
317 goto restart;
318 }
319
320 clear_bit(HCI_UART_SENDING, &hu->tx_state);
321 up(&hu->tx_sem);
322 #endif
323
324 return;
325 }
326
327 /* ------- Interface to HCI layer ------ */
328 /* Initialize device */
hci_uart_open(struct hci_dev * hdev)329 static int hci_uart_open(struct hci_dev *hdev)
330 {
331 BT_DBG("%s %p", hdev->name, hdev);
332
333 /* Undo clearing this from hci_uart_close() */
334 hdev->flush = hci_uart_flush;
335
336 #if HCI_VERSION_CODE < KERNEL_VERSION(4, 4, 0)
337 set_bit(HCI_RUNNING, &hdev->flags);
338 #endif
339
340 #ifdef BTCOEX
341 rtk_btcoex_open(hdev);
342 #endif
343
344 return 0;
345 }
346
347 /* static void hci_flush_sync(struct hci_dev *hdev)
348 * {
349 * #if HCI_VERSION_CODE >= KERNEL_VERSION(3, 10, 0)
350 * u8 buf[2] = { 0, 0 };
351 * struct sk_buff *skb;
352 *
353 * BT_INFO("hci flush sync");
354 *
355 * set_bit(HCI_INIT, &hdev->flags);
356 * skb = __hci_cmd_sync(hdev, 0xfc19, 2, buf, msecs_to_jiffies(2000));
357 * clear_bit(HCI_INIT, &hdev->flags);
358 *
359 * if (IS_ERR(skb)) {
360 * BT_ERR("command 0xfc19 tx failed (%ld)\n", PTR_ERR(skb));
361 * return;
362 * }
363 *
364 * if (skb->len == 1)
365 * BT_INFO("hci flush sync status %u", skb->data[0]);
366 *
367 * kfree_skb(skb);
368 * #endif
369 * }
370 */
371
__hci_uart_flush(struct hci_dev * hdev,u8 sync)372 static int __hci_uart_flush(struct hci_dev *hdev, u8 sync)
373 {
374 struct hci_uart *hu = GET_DRV_DATA(hdev); //(struct hci_uart *) hdev->driver_data;
375 struct tty_struct *tty = hu->tty;
376
377 BT_INFO("%s: hdev %p tty %p", __func__, hdev, tty);
378
379 /* Make sure all HCI packets has been transmitted */
380 /* if (sync && test_bit(HCI_RUNNING, &hdev->flags))
381 * hci_flush_sync(hdev);
382 */
383
384 if (hu->tx_skb) {
385 kfree_skb(hu->tx_skb);
386 hu->tx_skb = NULL;
387 }
388
389 /* Flush any pending characters in the driver and discipline. */
390 /* tty_ldisc_flush(tty);
391 * tty_driver_flush_buffer(tty);
392 */
393 /* Don't flush the tty. Sometime, the hdev is closed abnormally.
394 * There may be cmd complete event in rx buf or the sent ack in tx buf.
395 * tty flush will result in hciX: command 0xXXXX tx timeout
396 */
397 tty_wait_until_sent(tty, msecs_to_jiffies(500));
398
399 hci_proto_read_lock(hu);
400
401 if (test_bit(HCI_UART_PROTO_READY, &hu->flags))
402 hu->proto->flush(hu);
403
404 hci_proto_read_unlock(hu);
405
406 return 0;
407 }
408
409 /* Reset device */
hci_uart_flush(struct hci_dev * hdev)410 static int hci_uart_flush(struct hci_dev *hdev)
411 {
412 return __hci_uart_flush(hdev, 1);
413 }
414
415 /* Close device */
hci_uart_close(struct hci_dev * hdev)416 static int hci_uart_close(struct hci_dev *hdev)
417 {
418 BT_INFO("%s: hdev %p", __func__, hdev);
419
420 /* When in kernel 4.4.0 and greater, the HCI_RUNNING bit is
421 * cleared in hci_dev_do_close(). */
422 #if HCI_VERSION_CODE < KERNEL_VERSION(4, 4, 0)
423 if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
424 return 0;
425 #else
426 if (test_bit(HCI_RUNNING, &hdev->flags))
427 BT_ERR("HCI_RUNNING is not cleared before.");
428 #endif
429
430 if (test_bit(HCI_RUNNING, &hdev->flags))
431 __hci_uart_flush(hdev, 0);
432 else
433 __hci_uart_flush(hdev, 1);
434
435 hdev->flush = NULL;
436
437 #ifdef BTCOEX
438 rtk_btcoex_close();
439 #endif
440
441 return 0;
442 }
443
444 /* Send frames from HCI layer */
445 #if HCI_VERSION_CODE < KERNEL_VERSION(3, 13, 0)
hci_uart_send_frame(struct sk_buff * skb)446 int hci_uart_send_frame(struct sk_buff *skb)
447 #else
448 int hci_uart_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
449 #endif
450 {
451 #if HCI_VERSION_CODE < KERNEL_VERSION(3, 13, 0)
452 struct hci_dev *hdev = (struct hci_dev *)skb->dev;
453 #endif
454 struct hci_uart *hu;
455
456 if (!hdev) {
457 BT_ERR("Frame for unknown device (hdev=NULL)");
458 return -ENODEV;
459 }
460
461 #if HCI_VERSION_CODE < KERNEL_VERSION(4, 4, 0)
462 if (!test_bit(HCI_RUNNING, &hdev->flags))
463 return -EBUSY;
464 #endif
465
466 hu = GET_DRV_DATA(hdev); //(struct hci_uart *) hdev->driver_data;
467
468 BT_DBG("%s: type %d len %d", hdev->name, bt_cb(skb)->pkt_type,
469 skb->len);
470
471 #ifdef BTCOEX
472 if (bt_cb(skb)->pkt_type == HCI_COMMAND_PKT)
473 rtk_btcoex_parse_cmd(skb->data, skb->len);
474 if (bt_cb(skb)->pkt_type == HCI_ACLDATA_PKT)
475 rtk_btcoex_parse_l2cap_data_tx(skb->data, skb->len);
476 #endif
477
478 hci_proto_read_lock(hu);
479
480 if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) {
481 hci_proto_read_unlock(hu);
482 return -EUNATCH;
483 }
484
485 hu->proto->enqueue(hu, skb);
486 hci_proto_read_unlock(hu);
487
488 hci_uart_tx_wakeup(hu);
489
490 return 0;
491 }
492
493 #if HCI_VERSION_CODE < KERNEL_VERSION(3, 4, 0)
hci_uart_destruct(struct hci_dev * hdev)494 static void hci_uart_destruct(struct hci_dev *hdev)
495 {
496 if (!hdev)
497 return;
498
499 BT_DBG("%s", hdev->name);
500 kfree(hdev->driver_data);
501 }
502 #endif
503
504 #if WOBT_NOTIFY
505 #if HCI_VERSION_CODE < KERNEL_VERSION(4, 13, 0)
skb_put_data(struct sk_buff * skb,const void * data,unsigned int len)506 static inline void *skb_put_data(struct sk_buff *skb, const void *data,
507 unsigned int len)
508 {
509 void *tmp = skb_put(skb, len);
510
511 memcpy(tmp, data, len);
512
513 return tmp;
514 }
515 #endif
516
hci_uart_async_send(struct hci_uart * hu,u16 opcode,u32 plen,const void * param)517 static int hci_uart_async_send(struct hci_uart *hu, u16 opcode,
518 u32 plen, const void *param)
519 {
520 int len = HCI_COMMAND_HDR_SIZE + plen;
521 struct hci_command_hdr *hdr;
522 struct sk_buff *skb;
523
524 skb = bt_skb_alloc(len, GFP_ATOMIC);
525 if (!skb)
526 return -ENOMEM;
527
528 hdr = (struct hci_command_hdr *)skb_put(skb, HCI_COMMAND_HDR_SIZE);
529 hdr->opcode = cpu_to_le16(opcode);
530 hdr->plen = plen;
531
532 if (plen)
533 memcpy(skb_put(skb, plen), param, plen);
534
535 BT_INFO("rtl: skb len %d", skb->len);
536
537 bt_cb(skb)->pkt_type = HCI_COMMAND_PKT;
538
539 #if HCI_VERSION_CODE >= KERNEL_VERSION(3, 18, 0)
540 #if HCI_VERSION_CODE < KERNEL_VERSION(4, 4, 0)
541 bt_cb(skb)->opcode = opcode;
542 #else
543 bt_cb(skb)->hci.opcode = opcode;
544 #endif
545 #endif
546
547 /* Stand-alone HCI commands must be flagged as
548 * single-command requests.
549 */
550 #if HCI_VERSION_CODE >= KERNEL_VERSION(3, 10, 0)
551 #if HCI_VERSION_CODE < KERNEL_VERSION(4, 4, 0)
552 bt_cb(skb)->req.start = true;
553 #else
554
555 #if HCI_VERSION_CODE < KERNEL_VERSION(4, 5, 0)
556 bt_cb(skb)->hci.req_start = true;
557 #else
558
559 bt_cb(skb)->hci.req_flags |= HCI_REQ_START;
560 #endif
561 #endif /* 4.4.0 */
562 #endif /* 3.10.0 */
563
564 #if HCI_VERSION_CODE < KERNEL_VERSION(3, 13, 0)
565 hci_uart_send_frame(skb);
566 #else
567 hci_uart_send_frame(hu->hdev, skb);
568 #endif
569
570 /* hci_proto_read_lock(hu);
571
572 * if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) {
573 * hci_proto_read_unlock(hu);
574 * BT_ERR("rtl send: proto not ready");
575 * return -EUNATCH;
576 * }
577
578 * hu->proto->enqueue(hu, skb);
579 * hci_proto_read_unlock(hu);
580
581 * hci_uart_tx_wakeup(hu);
582 */
583
584 return 0;
585 }
586
rtl_read_local_version(struct hci_dev * hdev,u8 * hci_ver,u16 * hci_rev,u16 * lmp_subver)587 static int rtl_read_local_version(struct hci_dev *hdev, u8 *hci_ver,
588 u16 *hci_rev, u16 *lmp_subver)
589 {
590 struct hci_rsp_read_local *ver;
591 struct sk_buff *skb;
592
593 skb = __hci_cmd_sync(hdev, 0x1001, 0, NULL, HCI_INIT_TIMEOUT);
594 if (IS_ERR(skb)) {
595 BT_ERR("rtl: Could not read lmp subversion");
596 return PTR_ERR(skb);
597 }
598
599 if (skb->len != sizeof(struct hci_rsp_read_local)) {
600 BT_ERR("%s: rtl: Local version length mismatch", hdev->name);
601 kfree_skb(skb);
602 return -EIO;
603 }
604
605 ver = (struct hci_rsp_read_local *)skb->data;
606 *hci_ver = ver->hci_ver;
607 *hci_rev = le16_to_cpu(ver->hci_rev);
608 *lmp_subver = le16_to_cpu(ver->lmp_subver);
609
610 kfree_skb(skb);
611
612 return 0;
613 }
614
615 #if RTKBT_TV_POWERON_WHITELIST
rtkbt_lookup_le_device_poweron_whitelist(struct hci_uart * hu)616 static int rtkbt_lookup_le_device_poweron_whitelist(struct hci_uart *hu)
617 {
618 struct hci_conn_params *p;
619 u8 *params;
620 int result = 0;
621
622 hci_dev_lock(hu->hdev);
623 list_for_each_entry(p, &hu->hdev->le_conn_params, list) {
624 #if 0 // for debug message
625 BT_INFO("%s(): auto_connect = %d", __FUNCTION__, p->auto_connect);
626 BT_INFO("%s(): addr_type = 0x%02x", __FUNCTION__, p->addr_type);
627 BT_INFO("%s(): addr=%02x:%02x:%02x:%02x:%02x:%02x", __FUNCTION__,
628 p->addr.b[5], p->addr.b[4], p->addr.b[3],
629 p->addr.b[2], p->addr.b[1], p->addr.b[0]);
630 #endif
631 if ( p->auto_connect == HCI_AUTO_CONN_ALWAYS &&
632 p->addr_type == ADDR_LE_DEV_PUBLIC ) {
633
634 BT_INFO("%s(): Set RTKBT LE Power-on Whitelist for "
635 "%02x:%02x:%02x:%02x:%02x:%02x", __FUNCTION__,
636 p->addr.b[5], p->addr.b[4], p->addr.b[3],
637 p->addr.b[2], p->addr.b[1], p->addr.b[0]);
638
639 params = kzalloc(8, GFP_ATOMIC);
640 if (!params) {
641 BT_ERR("Can't allocate memory for params");
642 return -ENOMEM;
643 }
644
645 params[0] = 0x00;
646 params[1] = p->addr.b[0];
647 params[2] = p->addr.b[1];
648 params[3] = p->addr.b[2];
649 params[4] = p->addr.b[3];
650 params[5] = p->addr.b[4];
651 params[6] = p->addr.b[5];
652
653 result = hci_uart_async_send(hu, 0xfc7b, 7, params);
654 if (result)
655 BT_ERR("rtl: Command failed for power-on whitelist");
656
657 msleep(500);
658
659 kfree(params);
660 }
661 }
662 hci_dev_unlock(hu->hdev);
663
664 return result;
665 }
666 #endif
667
668 #if RTKBT_TV_POWERON_DATA_FILTER
rtkbt_set_le_device_poweron_data_filter(struct hci_uart * hu)669 static int rtkbt_set_le_device_poweron_data_filter(struct hci_uart *hu)
670 {
671 /* Set data filter on Manufacturer field of Advertising data */
672 /* Manufacturer | ID | Additional data*/
673 /* Technicolor | 0x02af | 0x57, 0x41, 0x4b, 0x45, 0x55, 0x50 */
674 u8 params[8] = { 0xaf, 0x02, // Manufacturer ID
675 0x57, 0x41, 0x4b, 0x45, 0x55, 0x50 }; // Additional data
676 int result = 0;
677
678 result = hci_uart_async_send(hu, 0xfc7f, 8, params);
679 if (result)
680 BT_ERR("rtl: Command failed for set data filter");
681
682 return result;
683 }
684 #endif
685
rtkbt_simulate_disconnect_event(struct hci_uart * hu)686 static int rtkbt_simulate_disconnect_event(struct hci_uart *hu)
687 {
688 struct hci_conn *conn;
689 struct sk_buff *rx_skb;
690 u8 event_params[6] = { 0x05, 0x04, 0x00, 0x10, 0x00, 0x13 };
691 int result = 0;
692
693 hci_dev_lock(hu->hdev);
694
695 conn = hci_conn_hash_lookup_state(hu->hdev, LE_LINK, BT_CONNECTED);
696 if (conn && (conn->state == BT_CONNECTED)){
697 rx_skb = alloc_skb(6, GFP_ATOMIC);
698 if (!rx_skb)
699 return -1;
700
701 event_params[3] = (u8)(conn->handle);
702 event_params[4] = (u8)(conn->handle >> 8);
703 hci_skb_pkt_type(rx_skb) = HCI_EVENT_PKT;
704 skb_put_data(rx_skb, event_params, 6);
705
706 BT_INFO("Send Disconnect Complete EVENT to upper stack");
707 hci_recv_frame(hu->hdev, rx_skb);
708 }
709
710 hci_dev_unlock(hu->hdev);
711
712 msleep(1000);
713
714 return result;
715 }
716
rtkbt_notify_suspend(struct hci_uart * hu)717 static int rtkbt_notify_suspend(struct hci_uart *hu)
718 {
719 u8 params_suspend_notify[1] = { 0x01 };
720 int result = 0;
721
722 result = hci_uart_async_send(hu, 0xfc28, 1, params_suspend_notify);
723 if (result)
724 BT_ERR("Realtek suspend h5-bt failed");
725
726 msleep(500);
727
728 return result;
729 }
730
le_scan_disable(struct hci_uart * hu)731 static void le_scan_disable(struct hci_uart *hu)
732 {
733 #if HCI_VERSION_CODE >= KERNEL_VERSION(4, 19, 0)
734 if (use_ext_scan(hu->hdev)) {
735 u8 ext_enable_cp[6] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
736
737 hci_uart_async_send(hu, HCI_OP_LE_SET_EXT_SCAN_ENABLE, 6, ext_enable_cp);
738 } else {
739 u8 enable_cp[2] = {0x00, 0x00};
740
741 hci_uart_async_send(hu, HCI_OP_LE_SET_SCAN_ENABLE, 2, enable_cp);
742 }
743 #else
744 u8 enable_cp[2] = {0x00, 0x00};
745
746 hci_uart_async_send(hu, HCI_OP_LE_SET_SCAN_ENABLE, 2, enable_cp);
747 #endif
748
749 return;
750 }
751
le_scan_restart(struct hci_uart * hu)752 static void le_scan_restart(struct hci_uart *hu)
753 {
754 int result;
755 #if HCI_VERSION_CODE >= KERNEL_VERSION(4, 19, 0)
756 if (use_ext_scan(hu->hdev)) {
757 u8 ext_enable_cp[6] = { 0x01, 0x01, 0x00, 0x00, 0x00, 0x00};
758
759 BT_INFO("LE Extended Scan Restart...");
760 le_scan_disable(hu);
761 result = hci_uart_async_send(hu, HCI_OP_LE_SET_EXT_SCAN_ENABLE, 6, ext_enable_cp);
762 if (result)
763 BT_ERR("LE Extended Scan Restart: Failed");
764 } else {
765 u8 enable_cp[2] = {0x01, 0x01};
766
767 BT_INFO("LE Scan Restart...");
768 le_scan_disable(hu);
769 result = hci_uart_async_send(hu, HCI_OP_LE_SET_SCAN_ENABLE, 2, enable_cp);
770 if (result)
771 BT_ERR("LE Scan Restart: Failed");
772 }
773 #else
774 u8 enable_cp[2] = {0x01, 0x01};
775
776 BT_INFO("LE Scan Restart");
777 le_scan_disable(hu);
778 result = hci_uart_async_send(hu, HCI_OP_LE_SET_SCAN_ENABLE, 2, enable_cp);
779 if (result)
780 BT_ERR("LE Scan Restart: Failed");
781 #endif
782 return;
783 }
784
le_aoto_conn_always_exist(struct hci_uart * hu)785 static bool le_aoto_conn_always_exist(struct hci_uart *hu)
786 {
787 struct hci_conn_params *p;
788 bool ret = false;
789
790 hci_dev_lock(hu->hdev);
791 list_for_each_entry(p, &hu->hdev->le_conn_params, list) {
792 if ( p->auto_connect == HCI_AUTO_CONN_ALWAYS &&
793 p->addr_type == ADDR_LE_DEV_PUBLIC ) {
794
795 ret = true;
796 }
797 }
798 hci_dev_unlock(hu->hdev);
799
800 return ret;
801 }
802
hci_uart_pm_notifier(struct notifier_block * b,unsigned long v,void * d)803 static int hci_uart_pm_notifier(struct notifier_block *b, unsigned long v, void *d)
804 {
805 int result;
806 struct hci_uart *hu = container_of(b, struct hci_uart, pm_notify_block);
807 u8 hci_ver = 0;
808 u16 hci_rev = 0;
809 u16 lmp_subver = 0;
810 #if WOBT_NOTIFY_BG_SCAN_LE_WHITELIST_ONLY
811 u8 params_bg_scan[5] = { 0x60, 0x01, 0x10, 0x00, 0x01 };
812 #endif
813
814 BT_INFO("%s: %lu", __func__, v);
815 switch (v) {
816 case PM_SUSPEND_PREPARE:
817 BT_INFO("rtl: bt suspending");
818 #if WOBT_NOTIFY_BG_SCAN_LE_WHITELIST_ONLY
819 /* Send set back ground scan parameters to Controller for power-on mode */
820 result = hci_uart_async_send(hu, 0xfc7a, 5, params_bg_scan);
821 if (result)
822 BT_ERR("Realtek bg-scan h5-bt failed");
823 /* FIXME: Ensure the above vendor command is sent to Controller
824 * and we received the h5 ack from Controller
825 * */
826 msleep(500);
827
828 #endif
829
830 #if RTKBT_TV_POWERON_WHITELIST
831 result = rtkbt_lookup_le_device_poweron_whitelist(hu);
832 if (result < 0) {
833 BT_ERR("rtkbt_lookup_le_device_poweron_whitelist error: %d", result);
834 }
835 #endif
836
837 #if RTKBT_TV_POWERON_DATA_FILTER
838 result = rtkbt_set_le_device_poweron_data_filter(hu);
839 if (result < 0) {
840 BT_ERR("rtkbt_set_le_device_poweron_data_filter error: %d", result);
841 }
842 #endif
843 result = rtkbt_notify_suspend(hu);
844 if (result < 0) {
845 BT_ERR("rtkbt_notify_suspend error: %d", result);
846 }
847
848 break;
849 case PM_POST_SUSPEND:
850 result = rtl_read_local_version(hu->hdev, &hci_ver, &hci_rev,
851 &lmp_subver);
852 if (result)
853 break;
854 BT_INFO("rtl resume: hci ver %u, hci rev %04x, lmp subver %04x",
855 hci_ver, hci_rev, lmp_subver);
856
857 result = rtkbt_simulate_disconnect_event(hu);
858 if (result < 0)
859 BT_ERR("rtkbt_simulate_disconnect_event error: %d", result);
860
861 if (le_aoto_conn_always_exist(hu))
862 le_scan_restart(hu);
863
864 break;
865 default:
866 BT_INFO("Caught msg %lu other than SUSPEND_PREPARE", v);
867 break;
868 }
869
870 return 0;
871 }
872 #endif
873
874 /* ------ LDISC part ------ */
875 /* hci_uart_tty_open
876 *
877 * Called when line discipline changed to HCI_UART.
878 *
879 * Arguments:
880 * tty pointer to tty info structure
881 * Return Value:
882 * 0 if success, otherwise error code
883 */
hci_uart_tty_open(struct tty_struct * tty)884 static int hci_uart_tty_open(struct tty_struct *tty)
885 {
886 struct hci_uart *hu = (void *)tty->disc_data;
887
888 BT_DBG("tty %p", tty);
889
890 /* But nothing ensures disc_data to be NULL. And since ld->ops->open
891 * shall be called only once, we do not need the check at all.
892 * So remove it.
893 *
894 * Note that this is not an issue now, but n_tty will start using the
895 * disc_data pointer and this invalid 'if' would trigger then rendering
896 * TTYs over BT unusable.
897 */
898 #if LINUX_VERSION_CODE < KERNEL_VERSION(3, 8, 0)
899 /* FIXME: This btw is bogus, nothing requires the old ldisc to clear
900 * the pointer
901 */
902 if (hu)
903 return -EEXIST;
904 #endif
905
906 /* Error if the tty has no write op instead of leaving an exploitable
907 * hole
908 */
909 if (tty->ops->write == NULL)
910 return -EOPNOTSUPP;
911
912 if (!(hu = kzalloc(sizeof(struct hci_uart), GFP_KERNEL))) {
913 BT_ERR("Can't allocate control structure");
914 return -ENFILE;
915 }
916
917 tty->disc_data = hu;
918 hu->tty = tty;
919 tty->receive_room = 65536;
920
921 INIT_WORK(&hu->write_work, hci_uart_write_work);
922
923 hci_proto_init_rwlock(hu);
924 sema_init(&hu->tx_sem, 1);
925
926 /* Flush any pending characters in the driver and line discipline. */
927
928 /* FIXME: why is this needed. Note don't use ldisc_ref here as the
929 open path is before the ldisc is referencable */
930
931 if (tty->ldisc->ops->flush_buffer)
932 tty->ldisc->ops->flush_buffer(tty);
933 tty_driver_flush_buffer(tty);
934
935 #if WOBT_NOTIFY
936 hu->pm_notify_block.notifier_call = hci_uart_pm_notifier;
937 register_pm_notifier(&hu->pm_notify_block);
938 #endif
939
940 return 0;
941 }
942
943 /* hci_uart_tty_close()
944 *
945 * Called when the line discipline is changed to something
946 * else, the tty is closed, or the tty detects a hangup.
947 */
hci_uart_tty_close(struct tty_struct * tty)948 static void hci_uart_tty_close(struct tty_struct *tty)
949 {
950 struct hci_uart *hu = (void *)tty->disc_data;
951 struct hci_dev *hdev;
952
953 BT_INFO("%s: tty %p", __func__, tty);
954
955 /* Detach from the tty */
956 tty->disc_data = NULL;
957
958 if (!hu)
959 return;
960
961 hdev = hu->hdev;
962 if (hdev)
963 hci_uart_close(hdev);
964
965 if (test_bit(HCI_UART_PROTO_READY, &hu->flags)) {
966 hci_proto_write_lock(hu);
967 clear_bit(HCI_UART_PROTO_READY, &hu->flags);
968 hci_proto_write_unlock(hu);
969
970 cancel_work_sync(&hu->write_work);
971
972 if (hdev) {
973 if (test_bit(HCI_UART_REGISTERED, &hu->flags))
974 hci_unregister_dev(hdev);
975 hci_free_dev(hdev);
976 }
977 hu->proto->close(hu);
978 }
979 clear_bit(HCI_UART_PROTO_SET, &hu->flags);
980
981 hci_proto_free_rwlock(hu);
982 #if WOBT_NOTIFY
983 unregister_pm_notifier(&hu->pm_notify_block);
984 #endif
985
986 kfree(hu);
987 }
988
989 /* hci_uart_tty_wakeup()
990 *
991 * Callback for transmit wakeup. Called when low level
992 * device driver can accept more send data.
993 *
994 * Arguments: tty pointer to associated tty instance data
995 * Return Value: None
996 */
hci_uart_tty_wakeup(struct tty_struct * tty)997 static void hci_uart_tty_wakeup(struct tty_struct *tty)
998 {
999 struct hci_uart *hu = (void *)tty->disc_data;
1000
1001 BT_DBG("");
1002
1003 if (!hu)
1004 return;
1005
1006 clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
1007
1008 if (tty != hu->tty)
1009 return;
1010
1011 if (test_bit(HCI_UART_PROTO_READY, &hu->flags))
1012 hci_uart_tx_wakeup(hu);
1013 }
1014
1015 /* hci_uart_tty_receive()
1016 *
1017 * Called by tty low level driver when receive data is
1018 * available.
1019 *
1020 * Arguments: tty pointer to tty isntance data
1021 * data pointer to received data
1022 * flags pointer to flags for data
1023 * count count of received data in bytes
1024 *
1025 * Return Value: None
1026 */
hci_uart_tty_receive(struct tty_struct * tty,const u8 * data,const char * flags,int count)1027 static void hci_uart_tty_receive(struct tty_struct *tty, const u8 * data,
1028 #if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 14, 0)
1029 const char *flags, int count)
1030 #else
1031 char *flags, int count)
1032 #endif
1033 {
1034 struct hci_uart *hu = (void *)tty->disc_data;
1035 int (*proto_receive)(struct hci_uart *hu, void *data, int len);
1036
1037 if (!hu || tty != hu->tty)
1038 return;
1039
1040 hci_proto_read_lock(hu);
1041
1042 if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) {
1043 hci_proto_read_unlock(hu);
1044 return;
1045 }
1046
1047 proto_receive = hu->proto->recv;
1048 #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 0, 0)
1049 proto_receive(hu, (void *)data, count);
1050 hci_proto_read_unlock(hu);
1051 #else
1052 hci_proto_read_unlock(hu);
1053 /* It does not need a lock here as it is already protected by a mutex in
1054 * tty caller
1055 */
1056 proto_receive(hu, (void *)data, count);
1057 #endif
1058
1059 if (hu->hdev)
1060 hu->hdev->stat.byte_rx += count;
1061
1062 tty_unthrottle(tty);
1063 }
1064
hci_uart_register_dev(struct hci_uart * hu)1065 static int hci_uart_register_dev(struct hci_uart *hu)
1066 {
1067 struct hci_dev *hdev;
1068
1069 BT_INFO("hci_uart_register_dev");
1070
1071 /* Initialize and register HCI device */
1072 hdev = hci_alloc_dev();
1073 if (!hdev) {
1074 BT_ERR("Can't allocate HCI device");
1075 return -ENOMEM;
1076 }
1077
1078 hu->hdev = hdev;
1079
1080 #if HCI_VERSION_CODE > KERNEL_VERSION(2, 6, 33)
1081 hdev->bus = HCI_UART;
1082 #else
1083 hdev->type = HCI_UART;
1084 #endif
1085
1086 #if HCI_VERSION_CODE >= KERNEL_VERSION(3, 4, 0)
1087 hci_set_drvdata(hdev, hu);
1088 #else
1089 hdev->driver_data = hu;
1090 #endif
1091
1092 hdev->open = hci_uart_open;
1093 hdev->close = hci_uart_close;
1094 hdev->flush = hci_uart_flush;
1095 hdev->send = hci_uart_send_frame;
1096
1097 /* NOTE: No hdev->setup setting for Realtek BTUART because
1098 * the download procedure is done with rtk_hciattach in userspace
1099 * before this function called in hci_uart_set_proto()
1100 */
1101
1102 SET_HCIDEV_DEV(hdev, hu->tty->dev);
1103
1104 #if HCI_VERSION_CODE < KERNEL_VERSION(3, 4, 0)
1105 hdev->destruct = hci_uart_destruct;
1106 hdev->owner = THIS_MODULE;
1107 #endif
1108
1109 #if HCI_VERSION_CODE < KERNEL_VERSION(3, 4, 0)
1110 if (!reset)
1111 set_bit(HCI_QUIRK_NO_RESET, &hdev->quirks);
1112 #endif
1113
1114 #if HCI_VERSION_CODE >= KERNEL_VERSION(2, 6, 36)
1115 if (test_bit(HCI_UART_RAW_DEVICE, &hu->hdev_flags))
1116 set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks);
1117 #endif
1118
1119 #if HCI_VERSION_CODE >= KERNEL_VERSION(3, 17, 0)
1120 if (test_bit(HCI_UART_EXT_CONFIG, &hu->hdev_flags))
1121 set_bit(HCI_QUIRK_EXTERNAL_CONFIG, &hdev->quirks);
1122 #endif
1123
1124 #if HCI_VERSION_CODE >= KERNEL_VERSION(3, 4, 0)
1125 if (!test_bit(HCI_UART_RESET_ON_INIT, &hu->hdev_flags))
1126 #if HCI_VERSION_CODE >= KERNEL_VERSION(3, 6, 0)
1127 set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);
1128 #else
1129 set_bit(HCI_QUIRK_NO_RESET, &hdev->quirks);
1130 #endif
1131 #endif
1132
1133 #if HCI_VERSION_CODE >= KERNEL_VERSION(3, 4, 0)
1134 if (test_bit(HCI_UART_CREATE_AMP, &hu->hdev_flags))
1135 hdev->dev_type = HCI_AMP;
1136 else
1137 #if HCI_VERSION_CODE < KERNEL_VERSION(4, 8, 0)
1138 hdev->dev_type = HCI_BREDR;
1139 #else
1140 hdev->dev_type = HCI_PRIMARY;
1141 #endif
1142 #endif
1143
1144 #if HCI_VERSION_CODE >= KERNEL_VERSION(4, 1, 0)
1145 set_bit(HCI_QUIRK_SIMULTANEOUS_DISCOVERY, &hdev->quirks);
1146 #endif
1147
1148 #if HCI_VERSION_CODE >= KERNEL_VERSION(5, 10, 21)
1149 #if WOBT_NOTIFY
1150 set_bit(HCI_QUIRK_NO_SUSPEND_NOTIFIER, &hdev->quirks);
1151 #endif
1152 #endif
1153
1154 if (hci_register_dev(hdev) < 0) {
1155 BT_ERR("Can't register HCI device");
1156 hci_free_dev(hdev);
1157 return -ENODEV;
1158 }
1159
1160 set_bit(HCI_UART_REGISTERED, &hu->flags);
1161
1162 #ifdef BTCOEX
1163 rtk_btcoex_probe(hdev);
1164 #endif
1165
1166 return 0;
1167 }
1168
hci_uart_set_proto(struct hci_uart * hu,int id)1169 static int hci_uart_set_proto(struct hci_uart *hu, int id)
1170 {
1171 struct hci_uart_proto *p;
1172 int err;
1173
1174 p = hci_uart_get_proto(id);
1175 if (!p)
1176 return -EPROTONOSUPPORT;
1177
1178 err = p->open(hu);
1179 if (err)
1180 return err;
1181
1182 hu->proto = p;
1183 set_bit(HCI_UART_PROTO_READY, &hu->flags);
1184
1185 /* Initialize and register HCI dev */
1186 err = hci_uart_register_dev(hu);
1187 if (err) {
1188 clear_bit(HCI_UART_PROTO_READY, &hu->flags);
1189 p->close(hu);
1190 return err;
1191 }
1192
1193 return 0;
1194 }
1195
1196 #if HCI_VERSION_CODE >= KERNEL_VERSION(3, 17, 0)
hci_uart_set_flags(struct hci_uart * hu,unsigned long flags)1197 static int hci_uart_set_flags(struct hci_uart *hu, unsigned long flags)
1198 {
1199 /* TODO: Add HCI_UART_INIT_PENDING, HCI_UART_VND_DETECT check */
1200 unsigned long valid_flags = BIT(HCI_UART_RAW_DEVICE) |
1201 BIT(HCI_UART_RESET_ON_INIT) |
1202 BIT(HCI_UART_CREATE_AMP) |
1203 BIT(HCI_UART_EXT_CONFIG);
1204
1205 if (flags & ~valid_flags)
1206 return -EINVAL;
1207
1208 hu->hdev_flags = flags;
1209
1210 return 0;
1211 }
1212 #endif
1213
1214 /* hci_uart_tty_ioctl()
1215 *
1216 * Process IOCTL system call for the tty device.
1217 *
1218 * Arguments:
1219 *
1220 * tty pointer to tty instance data
1221 * file pointer to open file object for device
1222 * cmd IOCTL command code
1223 * arg argument for IOCTL call (cmd dependent)
1224 *
1225 * Return Value: Command dependent
1226 */
hci_uart_tty_ioctl(struct tty_struct * tty,struct file * file,unsigned int cmd,unsigned long arg)1227 static int hci_uart_tty_ioctl(struct tty_struct *tty, struct file *file,
1228 unsigned int cmd, unsigned long arg)
1229 {
1230 struct hci_uart *hu = (void *)tty->disc_data;
1231 int err = 0;
1232
1233 BT_DBG("");
1234
1235 /* Verify the status of the device */
1236 if (!hu)
1237 return -EBADF;
1238
1239 switch (cmd) {
1240 case HCIUARTSETPROTO:
1241 if (!test_and_set_bit(HCI_UART_PROTO_SET, &hu->flags)) {
1242 err = hci_uart_set_proto(hu, arg);
1243 if (err) {
1244 clear_bit(HCI_UART_PROTO_SET, &hu->flags);
1245 return err;
1246 }
1247 } else
1248 return -EBUSY;
1249 break;
1250
1251 case HCIUARTGETPROTO:
1252 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
1253 return hu->proto->id;
1254 return -EUNATCH;
1255
1256 case HCIUARTGETDEVICE:
1257 if (test_bit(HCI_UART_REGISTERED, &hu->flags))
1258 return hu->hdev->id;
1259 return -EUNATCH;
1260
1261 case HCIUARTSETFLAGS:
1262 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
1263 return -EBUSY;
1264 #if HCI_VERSION_CODE >= KERNEL_VERSION(3, 17, 0)
1265 err = hci_uart_set_flags(hu, arg);
1266 if (err)
1267 return err;
1268 #else
1269 hu->hdev_flags = arg;
1270 #endif
1271 break;
1272
1273 case HCIUARTGETFLAGS:
1274 return hu->hdev_flags;
1275
1276 default:
1277 #if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 16, 0)
1278 err = n_tty_ioctl_helper(tty, cmd, arg);
1279 #else
1280 err = n_tty_ioctl_helper(tty, file, cmd, arg);
1281 #endif
1282 break;
1283 };
1284
1285 return err;
1286 }
1287
1288 /*
1289 * We don't provide read/write/poll interface for user space.
1290 */
1291 #if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 10, 20) && \
1292 ((LINUX_VERSION_CODE < KERNEL_VERSION(5, 11, 0)) || \
1293 (LINUX_VERSION_CODE >= KERNEL_VERSION(5, 11, 3)))
hci_uart_tty_read(struct tty_struct * tty,struct file * file,unsigned char * buf,size_t nr,void ** cookie,unsigned long offset)1294 static ssize_t hci_uart_tty_read(struct tty_struct *tty, struct file *file,
1295 unsigned char *buf, size_t nr,
1296 void **cookie, unsigned long offset)
1297 #else
1298 static ssize_t hci_uart_tty_read(struct tty_struct *tty, struct file *file,
1299 unsigned char __user * buf, size_t nr)
1300 #endif
1301 {
1302 return 0;
1303 }
1304
hci_uart_tty_write(struct tty_struct * tty,struct file * file,const unsigned char * data,size_t count)1305 static ssize_t hci_uart_tty_write(struct tty_struct *tty, struct file *file,
1306 const unsigned char *data, size_t count)
1307 {
1308 return 0;
1309 }
1310
hci_uart_tty_poll(struct tty_struct * tty,struct file * filp,poll_table * wait)1311 static unsigned int hci_uart_tty_poll(struct tty_struct *tty,
1312 struct file *filp, poll_table * wait)
1313 {
1314 return 0;
1315 }
1316
1317 static struct tty_ldisc_ops hci_uart_ldisc = {
1318 .owner = THIS_MODULE,
1319 #if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 14, 0)
1320 .num = N_HCI,
1321 #endif
1322 #if LINUX_VERSION_CODE < KERNEL_VERSION(5, 13, 0)
1323 .magic = TTY_LDISC_MAGIC,
1324 #endif
1325 .name = "n_hci",
1326 .open = hci_uart_tty_open,
1327 .close = hci_uart_tty_close,
1328 .read = hci_uart_tty_read,
1329 .write = hci_uart_tty_write,
1330 .ioctl = hci_uart_tty_ioctl,
1331 #if HCI_VERSION_CODE >= KERNEL_VERSION(4, 20, 0)
1332 .compat_ioctl = hci_uart_tty_ioctl,
1333 #endif
1334 .poll = hci_uart_tty_poll,
1335 .receive_buf = hci_uart_tty_receive,
1336 .write_wakeup = hci_uart_tty_wakeup,
1337 };
1338
hci_uart_init(void)1339 static int __init hci_uart_init(void)
1340 {
1341 int err;
1342
1343 BT_INFO("HCI UART driver ver %s", VERSION);
1344
1345 /* Register the tty discipline */
1346 #if HCI_VERSION_CODE >= KERNEL_VERSION(5, 14, 0)
1347 if ((err = tty_register_ldisc(&hci_uart_ldisc))) {
1348 #else
1349 if ((err = tty_register_ldisc(N_HCI, &hci_uart_ldisc))) {
1350 #endif
1351 BT_ERR("HCI line discipline registration failed. (%d)", err);
1352 return err;
1353 }
1354 #ifdef CONFIG_BT_HCIUART_H4
1355 h4_init();
1356 #endif
1357 /* Add realtek h5 support */
1358 h5_init();
1359
1360 #ifdef BTCOEX
1361 rtk_btcoex_init();
1362 #endif
1363
1364 return 0;
1365 }
1366
1367 static void __exit hci_uart_exit(void)
1368 {
1369 #if LINUX_VERSION_CODE < KERNEL_VERSION(5, 14, 0)
1370 int err;
1371 #endif
1372
1373 #ifdef CONFIG_BT_HCIUART_H4
1374 h4_deinit();
1375 #endif
1376 h5_deinit();
1377
1378 #if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 14, 0)
1379 tty_unregister_ldisc(&hci_uart_ldisc);
1380 #else
1381 /* Release tty registration of line discipline */
1382 if ((err = tty_unregister_ldisc(N_HCI)))
1383 BT_ERR("Can't unregister HCI line discipline (%d)", err);
1384 #endif
1385
1386 #ifdef BTCOEX
1387 rtk_btcoex_exit();
1388 #endif
1389 }
1390
1391 module_init(hci_uart_init);
1392 module_exit(hci_uart_exit);
1393
1394 #if HCI_VERSION_CODE < KERNEL_VERSION(3, 4, 0)
1395 module_param(reset, bool, 0644);
1396 MODULE_PARM_DESC(reset, "Send HCI reset command on initialization");
1397 #endif
1398
1399 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
1400 MODULE_DESCRIPTION("Bluetooth HCI UART driver ver " VERSION);
1401 MODULE_VERSION(VERSION);
1402 MODULE_LICENSE("GPL");
1403 MODULE_ALIAS_LDISC(N_HCI);
1404