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Merge tag 'for-linus-6.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rw...
[linux-block.git] / drivers / bluetooth / hci_ldisc.c
CommitLineData
1a59d1b8 1// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4 2/*
1da177e4 3 *
0372a662
MH		 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>
1da177e4 9 */
1da177e4 10
1da177e4
LT		 11#include <linux/module.h>
12
13#include <linux/kernel.h>
14#include <linux/init.h>
1da177e4
LT		 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>
18aeb444 28#include <linux/firmware.h>
7841d554 29#include <linux/serdev.h>
1da177e4
LT		 30
31#include <net/bluetooth/bluetooth.h>
32#include <net/bluetooth/hci_core.h>
33
bca03c95 34#include "btintel.h"
3e0ac12a 35#include "btbcm.h"
1da177e4
LT		 36#include "hci_uart.h"
37
788a6756 38#define VERSION "2.3"
0372a662 39
4ee7ef19 40static const struct hci_uart_proto *hup[HCI_UART_MAX_PROTO];
1da177e4 41
4ee7ef19 42int hci_uart_register_proto(const struct hci_uart_proto *p)
1da177e4
LT		 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;
0372a662 51
01009eec
MH		 52 BT_INFO("HCI UART protocol %s registered", p->name);
53
1da177e4
LT		 54 return 0;
55}
56
4ee7ef19 57int hci_uart_unregister_proto(const struct hci_uart_proto *p)
1da177e4
LT		 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;
0372a662 66
1da177e4
LT		 67 return 0;
68}
69
4ee7ef19 70static const struct hci_uart_proto *hci_uart_get_proto(unsigned int id)
1da177e4
LT		 71{
72 if (id >= HCI_UART_MAX_PROTO)
73 return NULL;
0372a662 74
1da177e4
LT		 75 return hup[id];
76}
77
78static inline void hci_uart_tx_complete(struct hci_uart *hu, int pkt_type)
79{
80 struct hci_dev *hdev = hu->hdev;
0372a662 81
1da177e4
LT		 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:
7f8f2729 93 hdev->stat.sco_tx++;
1da177e4
LT		 94 break;
95 }
96}
97
98static inline struct sk_buff *hci_uart_dequeue(struct hci_uart *hu)
99{
100 struct sk_buff *skb = hu->tx_skb;
0372a662 101
048e1bd3 102 if (!skb) {
67d2f878 103 percpu_down_read(&hu->proto_lock);
dec2c928 104
048e1bd3
DJ		 105 if (test_bit(HCI_UART_PROTO_READY, &hu->flags))
106 skb = hu->proto->dequeue(hu);
dec2c928 107
67d2f878 108 percpu_up_read(&hu->proto_lock);
048e1bd3 109 } else {
1da177e4 110 hu->tx_skb = NULL;
048e1bd3 111 }
0372a662 112
1da177e4
LT		 113 return skb;
114}
115
116int hci_uart_tx_wakeup(struct hci_uart *hu)
117{
67d2f878
RT		 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;
dec2c928 126
2d6f1da1 127 if (!test_bit(HCI_UART_PROTO_READY, &hu->flags))
dec2c928 128 goto no_schedule;
2d6f1da1 129
afe0b1c8
CC		 130 set_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
131 if (test_and_set_bit(HCI_UART_SENDING, &hu->tx_state))
dec2c928 132 goto no_schedule;
1da177e4
LT		 133
134 BT_DBG("");
135
da64c27d
FB		 136 schedule_work(&hu->write_work);
137
dec2c928 138no_schedule:
67d2f878 139 percpu_up_read(&hu->proto_lock);
dec2c928 140
da64c27d
FB		 141 return 0;
142}
081f36a8 143EXPORT_SYMBOL_GPL(hci_uart_tx_wakeup);
da64c27d
FB		 144
145static void hci_uart_write_work(struct work_struct *work)
146{
147 struct hci_uart *hu = container_of(work, struct hci_uart, write_work);
148 struct tty_struct *tty = hu->tty;
149 struct hci_dev *hdev = hu->hdev;
150 struct sk_buff *skb;
151
152 /* REVISIT: should we cope with bad skbs or ->write() returning
153 * and error value ?
154 */
155
1da177e4
LT		 156restart:
157 clear_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
158
159 while ((skb = hci_uart_dequeue(hu))) {
160 int len;
0372a662 161
1da177e4 162 set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
f34d7a5b 163 len = tty->ops->write(tty, skb->data, skb->len);
1da177e4
LT		 164 hdev->stat.byte_tx += len;
165
166 skb_pull(skb, len);
167 if (skb->len) {
168 hu->tx_skb = skb;
169 break;
170 }
0372a662 171
618e8bc2 172 hci_uart_tx_complete(hu, hci_skb_pkt_type(skb));
1da177e4 173 kfree_skb(skb);
0372a662
MH		 174 }
175
afe0b1c8 176 clear_bit(HCI_UART_SENDING, &hu->tx_state);
1da177e4
LT		 177 if (test_bit(HCI_UART_TX_WAKEUP, &hu->tx_state))
178 goto restart;
179
40fbb915 180 wake_up_bit(&hu->tx_state, HCI_UART_SENDING);
1da177e4
LT		 181}
182
fdee6d8f 183void hci_uart_init_work(struct work_struct *work)
9f2aee84
JH		 184{
185 struct hci_uart *hu = container_of(work, struct hci_uart, init_ready);
186 int err;
a225b8c7 187 struct hci_dev *hdev;
9f2aee84
JH		 188
189 if (!test_and_clear_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
190 return;
191
192 err = hci_register_dev(hu->hdev);
193 if (err < 0) {
194 BT_ERR("Can't register HCI device");
32a7b4cb
JC		 195 clear_bit(HCI_UART_PROTO_READY, &hu->flags);
196 hu->proto->close(hu);
a225b8c7 197 hdev = hu->hdev;
9f2aee84 198 hu->hdev = NULL;
a225b8c7 199 hci_free_dev(hdev);
cb926520 200 return;
9f2aee84
JH		 201 }
202
203 set_bit(HCI_UART_REGISTERED, &hu->flags);
204}
205
206int hci_uart_init_ready(struct hci_uart *hu)
207{
208 if (!test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
209 return -EALREADY;
210
211 schedule_work(&hu->init_ready);
212
213 return 0;
214}
215
40fbb915
SH		 216int hci_uart_wait_until_sent(struct hci_uart *hu)
217{
218 return wait_on_bit_timeout(&hu->tx_state, HCI_UART_SENDING,
219 TASK_INTERRUPTIBLE,
220 msecs_to_jiffies(2000));
221}
222
1da177e4 223/* ------- Interface to HCI layer ------ */
1da177e4
LT		 224/* Reset device */
225static int hci_uart_flush(struct hci_dev *hdev)
226{
155961e8 227 struct hci_uart *hu = hci_get_drvdata(hdev);
1da177e4
LT		 228 struct tty_struct *tty = hu->tty;
229
230 BT_DBG("hdev %p tty %p", hdev, tty);
231
232 if (hu->tx_skb) {
233 kfree_skb(hu->tx_skb); hu->tx_skb = NULL;
234 }
235
236 /* Flush any pending characters in the driver and discipline. */
237 tty_ldisc_flush(tty);
f34d7a5b 238 tty_driver_flush_buffer(tty);
1da177e4 239
67d2f878 240 percpu_down_read(&hu->proto_lock);
dec2c928 241
84cb3df0 242 if (test_bit(HCI_UART_PROTO_READY, &hu->flags))
1da177e4
LT		 243 hu->proto->flush(hu);
244
67d2f878 245 percpu_up_read(&hu->proto_lock);
dec2c928 246
1da177e4
LT		 247 return 0;
248}
249
412fe29f
HG		 250/* Initialize device */
251static int hci_uart_open(struct hci_dev *hdev)
252{
253 BT_DBG("%s %p", hdev->name, hdev);
254
255 /* Undo clearing this from hci_uart_close() */
256 hdev->flush = hci_uart_flush;
257
258 return 0;
259}
260
1da177e4
LT		 261/* Close device */
262static int hci_uart_close(struct hci_dev *hdev)
263{
264 BT_DBG("hdev %p", hdev);
265
1da177e4 266 hci_uart_flush(hdev);
3611f4d2 267 hdev->flush = NULL;
1da177e4
LT		 268 return 0;
269}
270
271/* Send frames from HCI layer */
7bd8f09f 272static int hci_uart_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
1da177e4 273{
52bc423a 274 struct hci_uart *hu = hci_get_drvdata(hdev);
1da177e4 275
618e8bc2
MH		 276 BT_DBG("%s: type %d len %d", hdev->name, hci_skb_pkt_type(skb),
277 skb->len);
1da177e4 278
67d2f878 279 percpu_down_read(&hu->proto_lock);
dec2c928
DJ		 280
281 if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) {
67d2f878 282 percpu_up_read(&hu->proto_lock);
ab00f89f 283 return -EUNATCH;
dec2c928 284 }
ab00f89f 285
1da177e4 286 hu->proto->enqueue(hu, skb);
67d2f878 287 percpu_up_read(&hu->proto_lock);
1da177e4
LT		 288
289 hci_uart_tx_wakeup(hu);
0372a662 290
1da177e4
LT		 291 return 0;
292}
293
b36a1552
VD		 294/* Check the underlying device or tty has flow control support */
295bool hci_uart_has_flow_control(struct hci_uart *hu)
296{
297 /* serdev nodes check if the needed operations are present */
298 if (hu->serdev)
299 return true;
300
301 if (hu->tty->driver->ops->tiocmget && hu->tty->driver->ops->tiocmset)
302 return true;
303
304 return false;
305}
306
2a973dfa
IF		 307/* Flow control or un-flow control the device */
308void hci_uart_set_flow_control(struct hci_uart *hu, bool enable)
309{
310 struct tty_struct *tty = hu->tty;
311 struct ktermios ktermios;
312 int status;
313 unsigned int set = 0;
314 unsigned int clear = 0;
315
7841d554
HG		 316 if (hu->serdev) {
317 serdev_device_set_flow_control(hu->serdev, !enable);
318 serdev_device_set_rts(hu->serdev, !enable);
319 return;
320 }
321
2a973dfa
IF		 322 if (enable) {
323 /* Disable hardware flow control */
324 ktermios = tty->termios;
325 ktermios.c_cflag &= ~CRTSCTS;
326 status = tty_set_termios(tty, &ktermios);
327 BT_DBG("Disabling hardware flow control: %s",
328 status ? "failed" : "success");
329
330 /* Clear RTS to prevent the device from sending */
331 /* Most UARTs need OUT2 to enable interrupts */
332 status = tty->driver->ops->tiocmget(tty);
333 BT_DBG("Current tiocm 0x%x", status);
334
335 set &= ~(TIOCM_OUT2 | TIOCM_RTS);
336 clear = ~set;
337 set &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
338 TIOCM_OUT2 | TIOCM_LOOP;
339 clear &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
340 TIOCM_OUT2 | TIOCM_LOOP;
341 status = tty->driver->ops->tiocmset(tty, set, clear);
342 BT_DBG("Clearing RTS: %s", status ? "failed" : "success");
343 } else {
344 /* Set RTS to allow the device to send again */
345 status = tty->driver->ops->tiocmget(tty);
346 BT_DBG("Current tiocm 0x%x", status);
347
348 set |= (TIOCM_OUT2 | TIOCM_RTS);
349 clear = ~set;
350 set &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
351 TIOCM_OUT2 | TIOCM_LOOP;
352 clear &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
353 TIOCM_OUT2 | TIOCM_LOOP;
354 status = tty->driver->ops->tiocmset(tty, set, clear);
355 BT_DBG("Setting RTS: %s", status ? "failed" : "success");
356
357 /* Re-enable hardware flow control */
358 ktermios = tty->termios;
359 ktermios.c_cflag |= CRTSCTS;
360 status = tty_set_termios(tty, &ktermios);
361 BT_DBG("Enabling hardware flow control: %s",
362 status ? "failed" : "success");
363 }
364}
365
366void hci_uart_set_speeds(struct hci_uart *hu, unsigned int init_speed,
367 unsigned int oper_speed)
368{
369 hu->init_speed = init_speed;
370 hu->oper_speed = oper_speed;
371}
372
7721383f
FD		 373void hci_uart_set_baudrate(struct hci_uart *hu, unsigned int speed)
374{
375 struct tty_struct *tty = hu->tty;
376 struct ktermios ktermios;
377
378 ktermios = tty->termios;
379 ktermios.c_cflag &= ~CBAUD;
7721383f
FD		 380 tty_termios_encode_baud_rate(&ktermios, speed, speed);
381
382 /* tty_set_termios() return not checked as it is always 0 */
383 tty_set_termios(tty, &ktermios);
384
2a973dfa
IF		 385 BT_DBG("%s: New tty speeds: %d/%d", hu->hdev->name,
386 tty->termios.c_ispeed, tty->termios.c_ospeed);
7721383f
FD		 387}
388
eb173809
LP		 389static int hci_uart_setup(struct hci_dev *hdev)
390{
391 struct hci_uart *hu = hci_get_drvdata(hdev);
fb2ce8d1
MH		 392 struct hci_rp_read_local_version *ver;
393 struct sk_buff *skb;
2a973dfa 394 unsigned int speed;
7721383f
FD		 395 int err;
396
2a973dfa 397 /* Init speed if any */
960ef1d7 398 if (hu->init_speed)
2a973dfa 399 speed = hu->init_speed;
960ef1d7
FD		 400 else if (hu->proto->init_speed)
401 speed = hu->proto->init_speed;
2a973dfa
IF		 402 else
403 speed = 0;
404
405 if (speed)
406 hci_uart_set_baudrate(hu, speed);
407
408 /* Operational speed if any */
960ef1d7 409 if (hu->oper_speed)
2a973dfa 410 speed = hu->oper_speed;
960ef1d7
FD		 411 else if (hu->proto->oper_speed)
412 speed = hu->proto->oper_speed;
2a973dfa
IF		 413 else
414 speed = 0;
7721383f 415
2a973dfa
IF		 416 if (hu->proto->set_baudrate && speed) {
417 err = hu->proto->set_baudrate(hu, speed);
7721383f 418 if (!err)
2a973dfa 419 hci_uart_set_baudrate(hu, speed);
7721383f 420 }
eb173809
LP		 421
422 if (hu->proto->setup)
423 return hu->proto->setup(hu);
424
fb2ce8d1
MH		 425 if (!test_bit(HCI_UART_VND_DETECT, &hu->hdev_flags))
426 return 0;
427
428 skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_VERSION, 0, NULL,
429 HCI_INIT_TIMEOUT);
430 if (IS_ERR(skb)) {
431 BT_ERR("%s: Reading local version information failed (%ld)",
432 hdev->name, PTR_ERR(skb));
433 return 0;
434 }
435
436 if (skb->len != sizeof(*ver)) {
437 BT_ERR("%s: Event length mismatch for version information",
438 hdev->name);
439 goto done;
440 }
441
442 ver = (struct hci_rp_read_local_version *)skb->data;
443
444 switch (le16_to_cpu(ver->manufacturer)) {
16e3887f
MH		 445#ifdef CONFIG_BT_HCIUART_INTEL
446 case 2:
bca03c95
MH		 447 hdev->set_bdaddr = btintel_set_bdaddr;
448 btintel_check_bdaddr(hdev);
16e3887f 449 break;
e9a2dd26
MH		 450#endif
451#ifdef CONFIG_BT_HCIUART_BCM
452 case 15:
3e0ac12a
MH		 453 hdev->set_bdaddr = btbcm_set_bdaddr;
454 btbcm_check_bdaddr(hdev);
e9a2dd26 455 break;
16e3887f 456#endif
d36dfb3e
FE		 457 default:
458 break;
fb2ce8d1
MH		 459 }
460
461done:
462 kfree_skb(skb);
eb173809
LP		 463 return 0;
464}
465
1da177e4
LT		 466/* ------ LDISC part ------ */
467/* hci_uart_tty_open
1687dfc3 468 *
1da177e4
LT		 469 * Called when line discipline changed to HCI_UART.
470 *
471 * Arguments:
472 * tty pointer to tty info structure
1687dfc3 473 * Return Value:
1da177e4
LT		 474 * 0 if success, otherwise error code
475 */
476static int hci_uart_tty_open(struct tty_struct *tty)
477{
f327b340 478 struct hci_uart *hu;
1da177e4
LT		 479
480 BT_DBG("tty %p", tty);
481
c05731d0
TLSC		 482 if (!capable(CAP_NET_ADMIN))
483 return -EPERM;
484
c19483cc 485 /* Error if the tty has no write op instead of leaving an exploitable
d98422cb
DR		 486 * hole
487 */
c19483cc
AC		 488 if (tty->ops->write == NULL)
489 return -EOPNOTSUPP;
490
a08b15e6
VI		 491 hu = kzalloc(sizeof(struct hci_uart), GFP_KERNEL);
492 if (!hu) {
7785162c 493 BT_ERR("Can't allocate control structure");
1da177e4
LT		 494 return -ENFILE;
495 }
3124d320
TH		 496 if (percpu_init_rwsem(&hu->proto_lock)) {
497 BT_ERR("Can't allocate semaphore structure");
498 kfree(hu);
499 return -ENOMEM;
500 }
0372a662 501
1da177e4
LT		 502 tty->disc_data = hu;
503 hu->tty = tty;
33f0f88f 504 tty->receive_room = 65536;
1da177e4 505
aeac3014
SR		 506 /* disable alignment support by default */
507 hu->alignment = 1;
508 hu->padding = 0;
509
9f2aee84 510 INIT_WORK(&hu->init_ready, hci_uart_init_work);
da64c27d 511 INIT_WORK(&hu->write_work, hci_uart_write_work);
9f2aee84 512
e6e981c7 513 /* Flush any pending characters in the driver */
f34d7a5b 514 tty_driver_flush_buffer(tty);
1da177e4
LT		 515
516 return 0;
517}
518
519/* hci_uart_tty_close()
520 *
521 * Called when the line discipline is changed to something
522 * else, the tty is closed, or the tty detects a hangup.
523 */
524static void hci_uart_tty_close(struct tty_struct *tty)
525{
dfe19d28 526 struct hci_uart *hu = tty->disc_data;
dac670b9 527 struct hci_dev *hdev;
1da177e4
LT		 528
529 BT_DBG("tty %p", tty);
530
531 /* Detach from the tty */
532 tty->disc_data = NULL;
533
dac670b9
JH		 534 if (!hu)
535 return;
22ad4203 536
dac670b9
JH		 537 hdev = hu->hdev;
538 if (hdev)
539 hci_uart_close(hdev);
1da177e4 540
dec2c928 541 if (test_bit(HCI_UART_PROTO_READY, &hu->flags)) {
67d2f878 542 percpu_down_write(&hu->proto_lock);
dec2c928 543 clear_bit(HCI_UART_PROTO_READY, &hu->flags);
67d2f878 544 percpu_up_write(&hu->proto_lock);
dec2c928 545
3b799254 546 cancel_work_sync(&hu->init_ready);
0338b1b3
RT		 547 cancel_work_sync(&hu->write_work);
548
dac670b9 549 if (hdev) {
9f2aee84
JH		 550 if (test_bit(HCI_UART_REGISTERED, &hu->flags))
551 hci_unregister_dev(hdev);
dac670b9 552 hci_free_dev(hdev);
1da177e4 553 }
dac670b9 554 hu->proto->close(hu);
1da177e4 555 }
84cb3df0 556 clear_bit(HCI_UART_PROTO_SET, &hu->flags);
dac670b9 557
e6a57d22
HZ		 558 percpu_free_rwsem(&hu->proto_lock);
559
dac670b9 560 kfree(hu);
1da177e4
LT		 561}
562
563/* hci_uart_tty_wakeup()
564 *
565 * Callback for transmit wakeup. Called when low level
566 * device driver can accept more send data.
567 *
568 * Arguments: tty pointer to associated tty instance data
569 * Return Value: None
570 */
571static void hci_uart_tty_wakeup(struct tty_struct *tty)
572{
dfe19d28 573 struct hci_uart *hu = tty->disc_data;
1da177e4
LT		 574
575 BT_DBG("");
576
577 if (!hu)
578 return;
579
580 clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
581
582 if (tty != hu->tty)
583 return;
584
84cb3df0 585 if (test_bit(HCI_UART_PROTO_READY, &hu->flags))
1da177e4
LT		 586 hci_uart_tx_wakeup(hu);
587}
588
1da177e4 589/* hci_uart_tty_receive()
1687dfc3 590 *
1da177e4
LT		 591 * Called by tty low level driver when receive data is
592 * available.
1687dfc3 593 *
1da177e4
LT		 594 * Arguments: tty pointer to tty isntance data
595 * data pointer to received data
596 * flags pointer to flags for data
597 * count count of received data in bytes
1687dfc3 598 *
55db4c64 599 * Return Value: None
1da177e4 600 */
facf5225 601static void hci_uart_tty_receive(struct tty_struct *tty, const u8 *data,
0f3dcf3b 602 const char *flags, int count)
1da177e4 603{
dfe19d28 604 struct hci_uart *hu = tty->disc_data;
0372a662 605
1da177e4 606 if (!hu || tty != hu->tty)
55db4c64 607 return;
1da177e4 608
67d2f878 609 percpu_down_read(&hu->proto_lock);
dec2c928
DJ		 610
611 if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) {
67d2f878 612 percpu_up_read(&hu->proto_lock);
55db4c64 613 return;
dec2c928 614 }
0372a662 615
7649faff
FD		 616 /* It does not need a lock here as it is already protected by a mutex in
617 * tty caller
618 */
9d1c40eb 619 hu->proto->recv(hu, data, count);
67d2f878 620 percpu_up_read(&hu->proto_lock);
788f0923
CP		 621
622 if (hu->hdev)
623 hu->hdev->stat.byte_rx += count;
624
39c2e60f 625 tty_unthrottle(tty);
1da177e4
LT		 626}
627
628static int hci_uart_register_dev(struct hci_uart *hu)
629{
630 struct hci_dev *hdev;
32a7b4cb 631 int err;
1da177e4
LT		 632
633 BT_DBG("");
634
635 /* Initialize and register HCI device */
636 hdev = hci_alloc_dev();
637 if (!hdev) {
638 BT_ERR("Can't allocate HCI device");
639 return -ENOMEM;
640 }
641
642 hu->hdev = hdev;
643
c13854ce 644 hdev->bus = HCI_UART;
155961e8 645 hci_set_drvdata(hdev, hu);
1da177e4 646
aee61f7a
MH		 647 /* Only when vendor specific setup callback is provided, consider
648 * the manufacturer information valid. This avoids filling in the
649 * value for Ericsson when nothing is specified.
650 */
651 if (hu->proto->setup)
652 hdev->manufacturer = hu->proto->manufacturer;
653
1da177e4
LT		 654 hdev->open = hci_uart_open;
655 hdev->close = hci_uart_close;
656 hdev->flush = hci_uart_flush;
657 hdev->send = hci_uart_send_frame;
eb173809 658 hdev->setup = hci_uart_setup;
6935e0f5 659 SET_HCIDEV_DEV(hdev, hu->tty->dev);
1da177e4 660
63c7d09c
JH		 661 if (test_bit(HCI_UART_RAW_DEVICE, &hu->hdev_flags))
662 set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks);
663
6afd04ad
MH		 664 if (test_bit(HCI_UART_EXT_CONFIG, &hu->hdev_flags))
665 set_bit(HCI_QUIRK_EXTERNAL_CONFIG, &hdev->quirks);
666
a55e1f38 667 if (!test_bit(HCI_UART_RESET_ON_INIT, &hu->hdev_flags))
a6c511c6 668 set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);
a55e1f38 669
8a7a3fd6
MH		 670 if (test_bit(HCI_UART_CREATE_AMP, &hu->hdev_flags))
671 hdev->dev_type = HCI_AMP;
672 else
ca8bee5d 673 hdev->dev_type = HCI_PRIMARY;
8a7a3fd6 674
32a7b4cb
JC		 675 /* Only call open() for the protocol after hdev is fully initialized as
676 * open() (or a timer/workqueue it starts) may attempt to reference it.
677 */
678 err = hu->proto->open(hu);
679 if (err) {
680 hu->hdev = NULL;
681 hci_free_dev(hdev);
682 return err;
683 }
684
9f2aee84
JH		 685 if (test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
686 return 0;
687
1da177e4
LT		 688 if (hci_register_dev(hdev) < 0) {
689 BT_ERR("Can't register HCI device");
32a7b4cb 690 hu->proto->close(hu);
a225b8c7 691 hu->hdev = NULL;
1da177e4
LT		 692 hci_free_dev(hdev);
693 return -ENODEV;
694 }
695
9f2aee84
JH		 696 set_bit(HCI_UART_REGISTERED, &hu->flags);
697
1da177e4
LT		 698 return 0;
699}
700
701static int hci_uart_set_proto(struct hci_uart *hu, int id)
702{
4ee7ef19 703 const struct hci_uart_proto *p;
0372a662
MH		 704 int err;
705
1da177e4
LT		 706 p = hci_uart_get_proto(id);
707 if (!p)
708 return -EPROTONOSUPPORT;
709
1da177e4
LT		 710 hu->proto = p;
711
712 err = hci_uart_register_dev(hu);
713 if (err) {
1da177e4
LT		 714 return err;
715 }
0372a662 716
56897b21 717 set_bit(HCI_UART_PROTO_READY, &hu->flags);
1da177e4
LT		 718 return 0;
719}
720
bb72bd68
MH		 721static int hci_uart_set_flags(struct hci_uart *hu, unsigned long flags)
722{
723 unsigned long valid_flags = BIT(HCI_UART_RAW_DEVICE) |
724 BIT(HCI_UART_RESET_ON_INIT) |
725 BIT(HCI_UART_CREATE_AMP) |
6afd04ad 726 BIT(HCI_UART_INIT_PENDING) |
fb2ce8d1
MH		 727 BIT(HCI_UART_EXT_CONFIG) |
728 BIT(HCI_UART_VND_DETECT);
bb72bd68 729
41533fe5 730 if (flags & ~valid_flags)
bb72bd68
MH		 731 return -EINVAL;
732
733 hu->hdev_flags = flags;
734
735 return 0;
736}
737
1da177e4
LT		 738/* hci_uart_tty_ioctl()
739 *
740 * Process IOCTL system call for the tty device.
741 *
742 * Arguments:
743 *
744 * tty pointer to tty instance data
1da177e4
LT		 745 * cmd IOCTL command code
746 * arg argument for IOCTL call (cmd dependent)
747 *
748 * Return Value: Command dependent
749 */
d78328bc
JS		 750static int hci_uart_tty_ioctl(struct tty_struct *tty, unsigned int cmd,
751 unsigned long arg)
1da177e4 752{
dfe19d28 753 struct hci_uart *hu = tty->disc_data;
1da177e4
LT		 754 int err = 0;
755
756 BT_DBG("");
757
758 /* Verify the status of the device */
759 if (!hu)
760 return -EBADF;
761
762 switch (cmd) {
763 case HCIUARTSETPROTO:
764 if (!test_and_set_bit(HCI_UART_PROTO_SET, &hu->flags)) {
765 err = hci_uart_set_proto(hu, arg);
05650694 766 if (err)
1da177e4 767 clear_bit(HCI_UART_PROTO_SET, &hu->flags);
0372a662 768 } else
05650694 769 err = -EBUSY;
c33be3c3 770 break;
1da177e4
LT		 771
772 case HCIUARTGETPROTO:
773 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
05650694
VR		 774 err = hu->proto->id;
775 else
776 err = -EUNATCH;
777 break;
0372a662 778
d2158744 779 case HCIUARTGETDEVICE:
c7e0c141 780 if (test_bit(HCI_UART_REGISTERED, &hu->flags))
05650694
VR		 781 err = hu->hdev->id;
782 else
783 err = -EUNATCH;
784 break;
d2158744 785
63c7d09c
JH		 786 case HCIUARTSETFLAGS:
787 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
05650694
VR		 788 err = -EBUSY;
789 else
790 err = hci_uart_set_flags(hu, arg);
63c7d09c
JH		 791 break;
792
793 case HCIUARTGETFLAGS:
05650694
VR		 794 err = hu->hdev_flags;
795 break;
63c7d09c 796
1da177e4 797 default:
7c783601 798 err = n_tty_ioctl_helper(tty, cmd, arg);
1da177e4 799 break;
a20890d0 800 }
1da177e4
LT		 801
802 return err;
803}
804
805/*
806 * We don't provide read/write/poll interface for user space.
807 */
0372a662 808static ssize_t hci_uart_tty_read(struct tty_struct *tty, struct file *file,
3b830a9c
LT		 809 unsigned char *buf, size_t nr,
810 void **cookie, unsigned long offset)
1da177e4
LT		 811{
812 return 0;
813}
0372a662
MH		 814
815static ssize_t hci_uart_tty_write(struct tty_struct *tty, struct file *file,
facf5225 816 const unsigned char *data, size_t count)
1da177e4
LT		 817{
818 return 0;
819}
0372a662 820
afc9a42b 821static __poll_t hci_uart_tty_poll(struct tty_struct *tty,
facf5225 822 struct file *filp, poll_table *wait)
1da177e4
LT		 823{
824 return 0;
825}
826
3b830a9c
LT		 827static struct tty_ldisc_ops hci_uart_ldisc = {
828 .owner = THIS_MODULE,
fbadf70a 829 .num = N_HCI,
3b830a9c
LT		 830 .name = "n_hci",
831 .open = hci_uart_tty_open,
832 .close = hci_uart_tty_close,
833 .read = hci_uart_tty_read,
834 .write = hci_uart_tty_write,
835 .ioctl = hci_uart_tty_ioctl,
836 .compat_ioctl = hci_uart_tty_ioctl,
837 .poll = hci_uart_tty_poll,
838 .receive_buf = hci_uart_tty_receive,
839 .write_wakeup = hci_uart_tty_wakeup,
840};
841
1da177e4
LT		 842static int __init hci_uart_init(void)
843{
1da177e4
LT		 844 int err;
845
846 BT_INFO("HCI UART driver ver %s", VERSION);
847
848 /* Register the tty discipline */
fbadf70a 849 err = tty_register_ldisc(&hci_uart_ldisc);
a08b15e6 850 if (err) {
1da177e4
LT		 851 BT_ERR("HCI line discipline registration failed. (%d)", err);
852 return err;
853 }
854
855#ifdef CONFIG_BT_HCIUART_H4
856 h4_init();
857#endif
858#ifdef CONFIG_BT_HCIUART_BCSP
859 bcsp_init();
860#endif
166d2f6a
OBC		 861#ifdef CONFIG_BT_HCIUART_LL
862 ll_init();
863#endif
b3190df6
SS		 864#ifdef CONFIG_BT_HCIUART_ATH3K
865 ath_init();
866#endif
7dec65c8
JH		 867#ifdef CONFIG_BT_HCIUART_3WIRE
868 h5_init();
869#endif
ca93cee5
LP		 870#ifdef CONFIG_BT_HCIUART_INTEL
871 intel_init();
872#endif
bdd8818e
MH		 873#ifdef CONFIG_BT_HCIUART_BCM
874 bcm_init();
875#endif
0ff252c1
BYTK		 876#ifdef CONFIG_BT_HCIUART_QCA
877 qca_init();
878#endif
395174bb
LP		 879#ifdef CONFIG_BT_HCIUART_AG6XX
880 ag6xx_init();
881#endif
162f812f
LP		 882#ifdef CONFIG_BT_HCIUART_MRVL
883 mrvl_init();
884#endif
166d2f6a 885
1da177e4
LT		 886 return 0;
887}
888
889static void __exit hci_uart_exit(void)
890{
1da177e4
LT		 891#ifdef CONFIG_BT_HCIUART_H4
892 h4_deinit();
893#endif
894#ifdef CONFIG_BT_HCIUART_BCSP
895 bcsp_deinit();
896#endif
166d2f6a
OBC		 897#ifdef CONFIG_BT_HCIUART_LL
898 ll_deinit();
899#endif
b3190df6
SS		 900#ifdef CONFIG_BT_HCIUART_ATH3K
901 ath_deinit();
902#endif
7dec65c8
JH		 903#ifdef CONFIG_BT_HCIUART_3WIRE
904 h5_deinit();
905#endif
ca93cee5
LP		 906#ifdef CONFIG_BT_HCIUART_INTEL
907 intel_deinit();
908#endif
bdd8818e
MH		 909#ifdef CONFIG_BT_HCIUART_BCM
910 bcm_deinit();
911#endif
0ff252c1
BYTK		 912#ifdef CONFIG_BT_HCIUART_QCA
913 qca_deinit();
914#endif
395174bb
LP		 915#ifdef CONFIG_BT_HCIUART_AG6XX
916 ag6xx_deinit();
917#endif
162f812f
LP		 918#ifdef CONFIG_BT_HCIUART_MRVL
919 mrvl_deinit();
920#endif
1da177e4 921
357a6a87 922 tty_unregister_ldisc(&hci_uart_ldisc);
1da177e4
LT		 923}
924
925module_init(hci_uart_init);
926module_exit(hci_uart_exit);
927
63fbd24e 928MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
1da177e4
LT		 929MODULE_DESCRIPTION("Bluetooth HCI UART driver ver " VERSION);
930MODULE_VERSION(VERSION);
931MODULE_LICENSE("GPL");
932MODULE_ALIAS_LDISC(N_HCI);
Linux 6.x block layer and io_uring tree(s)