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Merge tag 'pwm/for-4.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry...
[linux-2.6-block.git] / drivers / bluetooth / hci_ldisc.c
CommitLineData
1da177e4 1/*
1da177e4 2 *
0372a662
MH		 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 *
1da177e4 24 */
1da177e4 25
1da177e4
LT		 26#include <linux/module.h>
27
28#include <linux/kernel.h>
29#include <linux/init.h>
1da177e4
LT		 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>
18aeb444 43#include <linux/firmware.h>
1da177e4
LT		 44
45#include <net/bluetooth/bluetooth.h>
46#include <net/bluetooth/hci_core.h>
47
bca03c95 48#include "btintel.h"
3e0ac12a 49#include "btbcm.h"
1da177e4
LT		 50#include "hci_uart.h"
51
788a6756 52#define VERSION "2.3"
0372a662 53
4ee7ef19 54static const struct hci_uart_proto *hup[HCI_UART_MAX_PROTO];
1da177e4 55
4ee7ef19 56int hci_uart_register_proto(const struct hci_uart_proto *p)
1da177e4
LT		 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;
0372a662 65
01009eec
MH		 66 BT_INFO("HCI UART protocol %s registered", p->name);
67
1da177e4
LT		 68 return 0;
69}
70
4ee7ef19 71int hci_uart_unregister_proto(const struct hci_uart_proto *p)
1da177e4
LT		 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;
0372a662 80
1da177e4
LT		 81 return 0;
82}
83
4ee7ef19 84static const struct hci_uart_proto *hci_uart_get_proto(unsigned int id)
1da177e4
LT		 85{
86 if (id >= HCI_UART_MAX_PROTO)
87 return NULL;
0372a662 88
1da177e4
LT		 89 return hup[id];
90}
91
92static inline void hci_uart_tx_complete(struct hci_uart *hu, int pkt_type)
93{
94 struct hci_dev *hdev = hu->hdev;
0372a662 95
1da177e4
LT		 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:
7f8f2729 107 hdev->stat.sco_tx++;
1da177e4
LT		 108 break;
109 }
110}
111
112static inline struct sk_buff *hci_uart_dequeue(struct hci_uart *hu)
113{
114 struct sk_buff *skb = hu->tx_skb;
0372a662 115
1da177e4
LT		 116 if (!skb)
117 skb = hu->proto->dequeue(hu);
118 else
119 hu->tx_skb = NULL;
0372a662 120
1da177e4
LT		 121 return skb;
122}
123
124int hci_uart_tx_wakeup(struct hci_uart *hu)
125{
1da177e4
LT		 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
da64c27d
FB		 133 schedule_work(&hu->write_work);
134
135 return 0;
136}
137
138static 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
1da177e4
LT		 149restart:
150 clear_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
151
152 while ((skb = hci_uart_dequeue(hu))) {
153 int len;
0372a662 154
1da177e4 155 set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
f34d7a5b 156 len = tty->ops->write(tty, skb->data, skb->len);
1da177e4
LT		 157 hdev->stat.byte_tx += len;
158
159 skb_pull(skb, len);
160 if (skb->len) {
161 hu->tx_skb = skb;
162 break;
163 }
0372a662 164
618e8bc2 165 hci_uart_tx_complete(hu, hci_skb_pkt_type(skb));
1da177e4 166 kfree_skb(skb);
0372a662
MH		 167 }
168
1da177e4
LT		 169 if (test_bit(HCI_UART_TX_WAKEUP, &hu->tx_state))
170 goto restart;
171
172 clear_bit(HCI_UART_SENDING, &hu->tx_state);
1da177e4
LT		 173}
174
9f2aee84
JH		 175static 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
194int 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
1da177e4
LT		 204/* ------- Interface to HCI layer ------ */
205/* Initialize device */
206static 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 */
1da177e4
LT		 211 return 0;
212}
213
214/* Reset device */
215static int hci_uart_flush(struct hci_dev *hdev)
216{
155961e8 217 struct hci_uart *hu = hci_get_drvdata(hdev);
1da177e4
LT		 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);
f34d7a5b 228 tty_driver_flush_buffer(tty);
1da177e4 229
84cb3df0 230 if (test_bit(HCI_UART_PROTO_READY, &hu->flags))
1da177e4
LT		 231 hu->proto->flush(hu);
232
233 return 0;
234}
235
236/* Close device */
237static int hci_uart_close(struct hci_dev *hdev)
238{
239 BT_DBG("hdev %p", hdev);
240
1da177e4 241 hci_uart_flush(hdev);
3611f4d2 242 hdev->flush = NULL;
1da177e4
LT		 243 return 0;
244}
245
246/* Send frames from HCI layer */
7bd8f09f 247static int hci_uart_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
1da177e4 248{
52bc423a 249 struct hci_uart *hu = hci_get_drvdata(hdev);
1da177e4 250
618e8bc2
MH		 251 BT_DBG("%s: type %d len %d", hdev->name, hci_skb_pkt_type(skb),
252 skb->len);
1da177e4
LT		 253
254 hu->proto->enqueue(hu, skb);
255
256 hci_uart_tx_wakeup(hu);
0372a662 257
1da177e4
LT		 258 return 0;
259}
260
2a973dfa
IF		 261/* Flow control or un-flow control the device */
262void hci_uart_set_flow_control(struct hci_uart *hu, bool enable)
263{
264 struct tty_struct *tty = hu->tty;
265 struct ktermios ktermios;
266 int status;
267 unsigned int set = 0;
268 unsigned int clear = 0;
269
270 if (enable) {
271 /* Disable hardware flow control */
272 ktermios = tty->termios;
273 ktermios.c_cflag &= ~CRTSCTS;
274 status = tty_set_termios(tty, &ktermios);
275 BT_DBG("Disabling hardware flow control: %s",
276 status ? "failed" : "success");
277
278 /* Clear RTS to prevent the device from sending */
279 /* Most UARTs need OUT2 to enable interrupts */
280 status = tty->driver->ops->tiocmget(tty);
281 BT_DBG("Current tiocm 0x%x", status);
282
283 set &= ~(TIOCM_OUT2 | TIOCM_RTS);
284 clear = ~set;
285 set &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
286 TIOCM_OUT2 | TIOCM_LOOP;
287 clear &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
288 TIOCM_OUT2 | TIOCM_LOOP;
289 status = tty->driver->ops->tiocmset(tty, set, clear);
290 BT_DBG("Clearing RTS: %s", status ? "failed" : "success");
291 } else {
292 /* Set RTS to allow the device to send again */
293 status = tty->driver->ops->tiocmget(tty);
294 BT_DBG("Current tiocm 0x%x", status);
295
296 set |= (TIOCM_OUT2 | TIOCM_RTS);
297 clear = ~set;
298 set &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
299 TIOCM_OUT2 | TIOCM_LOOP;
300 clear &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
301 TIOCM_OUT2 | TIOCM_LOOP;
302 status = tty->driver->ops->tiocmset(tty, set, clear);
303 BT_DBG("Setting RTS: %s", status ? "failed" : "success");
304
305 /* Re-enable hardware flow control */
306 ktermios = tty->termios;
307 ktermios.c_cflag |= CRTSCTS;
308 status = tty_set_termios(tty, &ktermios);
309 BT_DBG("Enabling hardware flow control: %s",
310 status ? "failed" : "success");
311 }
312}
313
314void hci_uart_set_speeds(struct hci_uart *hu, unsigned int init_speed,
315 unsigned int oper_speed)
316{
317 hu->init_speed = init_speed;
318 hu->oper_speed = oper_speed;
319}
320
321void hci_uart_init_tty(struct hci_uart *hu)
322{
323 struct tty_struct *tty = hu->tty;
324 struct ktermios ktermios;
325
326 /* Bring the UART into a known 8 bits no parity hw fc state */
327 ktermios = tty->termios;
328 ktermios.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP |
329 INLCR | IGNCR | ICRNL | IXON);
330 ktermios.c_oflag &= ~OPOST;
331 ktermios.c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
332 ktermios.c_cflag &= ~(CSIZE | PARENB);
333 ktermios.c_cflag |= CS8;
334 ktermios.c_cflag |= CRTSCTS;
335
336 /* tty_set_termios() return not checked as it is always 0 */
337 tty_set_termios(tty, &ktermios);
338}
339
7721383f
FD		 340void hci_uart_set_baudrate(struct hci_uart *hu, unsigned int speed)
341{
342 struct tty_struct *tty = hu->tty;
343 struct ktermios ktermios;
344
345 ktermios = tty->termios;
346 ktermios.c_cflag &= ~CBAUD;
7721383f
FD		 347 tty_termios_encode_baud_rate(&ktermios, speed, speed);
348
349 /* tty_set_termios() return not checked as it is always 0 */
350 tty_set_termios(tty, &ktermios);
351
2a973dfa
IF		 352 BT_DBG("%s: New tty speeds: %d/%d", hu->hdev->name,
353 tty->termios.c_ispeed, tty->termios.c_ospeed);
7721383f
FD		 354}
355
eb173809
LP		 356static int hci_uart_setup(struct hci_dev *hdev)
357{
358 struct hci_uart *hu = hci_get_drvdata(hdev);
fb2ce8d1
MH		 359 struct hci_rp_read_local_version *ver;
360 struct sk_buff *skb;
2a973dfa 361 unsigned int speed;
7721383f
FD		 362 int err;
363
2a973dfa 364 /* Init speed if any */
960ef1d7 365 if (hu->init_speed)
2a973dfa 366 speed = hu->init_speed;
960ef1d7
FD		 367 else if (hu->proto->init_speed)
368 speed = hu->proto->init_speed;
2a973dfa
IF		 369 else
370 speed = 0;
371
372 if (speed)
373 hci_uart_set_baudrate(hu, speed);
374
375 /* Operational speed if any */
960ef1d7 376 if (hu->oper_speed)
2a973dfa 377 speed = hu->oper_speed;
960ef1d7
FD		 378 else if (hu->proto->oper_speed)
379 speed = hu->proto->oper_speed;
2a973dfa
IF		 380 else
381 speed = 0;
7721383f 382
2a973dfa
IF		 383 if (hu->proto->set_baudrate && speed) {
384 err = hu->proto->set_baudrate(hu, speed);
7721383f 385 if (!err)
2a973dfa 386 hci_uart_set_baudrate(hu, speed);
7721383f 387 }
eb173809
LP		 388
389 if (hu->proto->setup)
390 return hu->proto->setup(hu);
391
fb2ce8d1
MH		 392 if (!test_bit(HCI_UART_VND_DETECT, &hu->hdev_flags))
393 return 0;
394
395 skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_VERSION, 0, NULL,
396 HCI_INIT_TIMEOUT);
397 if (IS_ERR(skb)) {
398 BT_ERR("%s: Reading local version information failed (%ld)",
399 hdev->name, PTR_ERR(skb));
400 return 0;
401 }
402
403 if (skb->len != sizeof(*ver)) {
404 BT_ERR("%s: Event length mismatch for version information",
405 hdev->name);
406 goto done;
407 }
408
409 ver = (struct hci_rp_read_local_version *)skb->data;
410
411 switch (le16_to_cpu(ver->manufacturer)) {
16e3887f
MH		 412#ifdef CONFIG_BT_HCIUART_INTEL
413 case 2:
bca03c95
MH		 414 hdev->set_bdaddr = btintel_set_bdaddr;
415 btintel_check_bdaddr(hdev);
16e3887f 416 break;
e9a2dd26
MH		 417#endif
418#ifdef CONFIG_BT_HCIUART_BCM
419 case 15:
3e0ac12a
MH		 420 hdev->set_bdaddr = btbcm_set_bdaddr;
421 btbcm_check_bdaddr(hdev);
e9a2dd26 422 break;
16e3887f 423#endif
fb2ce8d1
MH		 424 }
425
426done:
427 kfree_skb(skb);
eb173809
LP		 428 return 0;
429}
430
1da177e4
LT		 431/* ------ LDISC part ------ */
432/* hci_uart_tty_open
1687dfc3 433 *
1da177e4
LT		 434 * Called when line discipline changed to HCI_UART.
435 *
436 * Arguments:
437 * tty pointer to tty info structure
1687dfc3 438 * Return Value:
1da177e4
LT		 439 * 0 if success, otherwise error code
440 */
441static int hci_uart_tty_open(struct tty_struct *tty)
442{
f327b340 443 struct hci_uart *hu;
1da177e4
LT		 444
445 BT_DBG("tty %p", tty);
446
c19483cc
AC		 447 /* Error if the tty has no write op instead of leaving an exploitable
448 hole */
449 if (tty->ops->write == NULL)
450 return -EOPNOTSUPP;
451
a08b15e6
VI		 452 hu = kzalloc(sizeof(struct hci_uart), GFP_KERNEL);
453 if (!hu) {
7785162c 454 BT_ERR("Can't allocate control structure");
1da177e4
LT		 455 return -ENFILE;
456 }
0372a662 457
1da177e4
LT		 458 tty->disc_data = hu;
459 hu->tty = tty;
33f0f88f 460 tty->receive_room = 65536;
1da177e4 461
9f2aee84 462 INIT_WORK(&hu->init_ready, hci_uart_init_work);
da64c27d 463 INIT_WORK(&hu->write_work, hci_uart_write_work);
9f2aee84 464
e6e981c7 465 /* Flush any pending characters in the driver */
f34d7a5b 466 tty_driver_flush_buffer(tty);
1da177e4
LT		 467
468 return 0;
469}
470
471/* hci_uart_tty_close()
472 *
473 * Called when the line discipline is changed to something
474 * else, the tty is closed, or the tty detects a hangup.
475 */
476static void hci_uart_tty_close(struct tty_struct *tty)
477{
dfe19d28 478 struct hci_uart *hu = tty->disc_data;
dac670b9 479 struct hci_dev *hdev;
1da177e4
LT		 480
481 BT_DBG("tty %p", tty);
482
483 /* Detach from the tty */
484 tty->disc_data = NULL;
485
dac670b9
JH		 486 if (!hu)
487 return;
22ad4203 488
dac670b9
JH		 489 hdev = hu->hdev;
490 if (hdev)
491 hci_uart_close(hdev);
1da177e4 492
da64c27d
FB		 493 cancel_work_sync(&hu->write_work);
494
84cb3df0 495 if (test_and_clear_bit(HCI_UART_PROTO_READY, &hu->flags)) {
dac670b9 496 if (hdev) {
9f2aee84
JH		 497 if (test_bit(HCI_UART_REGISTERED, &hu->flags))
498 hci_unregister_dev(hdev);
dac670b9 499 hci_free_dev(hdev);
1da177e4 500 }
dac670b9 501 hu->proto->close(hu);
1da177e4 502 }
84cb3df0 503 clear_bit(HCI_UART_PROTO_SET, &hu->flags);
dac670b9
JH		 504
505 kfree(hu);
1da177e4
LT		 506}
507
508/* hci_uart_tty_wakeup()
509 *
510 * Callback for transmit wakeup. Called when low level
511 * device driver can accept more send data.
512 *
513 * Arguments: tty pointer to associated tty instance data
514 * Return Value: None
515 */
516static void hci_uart_tty_wakeup(struct tty_struct *tty)
517{
dfe19d28 518 struct hci_uart *hu = tty->disc_data;
1da177e4
LT		 519
520 BT_DBG("");
521
522 if (!hu)
523 return;
524
525 clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
526
527 if (tty != hu->tty)
528 return;
529
84cb3df0 530 if (test_bit(HCI_UART_PROTO_READY, &hu->flags))
1da177e4
LT		 531 hci_uart_tx_wakeup(hu);
532}
533
1da177e4 534/* hci_uart_tty_receive()
1687dfc3 535 *
1da177e4
LT		 536 * Called by tty low level driver when receive data is
537 * available.
1687dfc3 538 *
1da177e4
LT		 539 * Arguments: tty pointer to tty isntance data
540 * data pointer to received data
541 * flags pointer to flags for data
542 * count count of received data in bytes
1687dfc3 543 *
55db4c64 544 * Return Value: None
1da177e4 545 */
facf5225
MH		 546static void hci_uart_tty_receive(struct tty_struct *tty, const u8 *data,
547 char *flags, int count)
1da177e4 548{
dfe19d28 549 struct hci_uart *hu = tty->disc_data;
0372a662 550
1da177e4 551 if (!hu || tty != hu->tty)
55db4c64 552 return;
1da177e4 553
84cb3df0 554 if (!test_bit(HCI_UART_PROTO_READY, &hu->flags))
55db4c64 555 return;
0372a662 556
7649faff
FD		 557 /* It does not need a lock here as it is already protected by a mutex in
558 * tty caller
559 */
9d1c40eb 560 hu->proto->recv(hu, data, count);
788f0923
CP		 561
562 if (hu->hdev)
563 hu->hdev->stat.byte_rx += count;
564
39c2e60f 565 tty_unthrottle(tty);
1da177e4
LT		 566}
567
568static int hci_uart_register_dev(struct hci_uart *hu)
569{
570 struct hci_dev *hdev;
571
572 BT_DBG("");
573
574 /* Initialize and register HCI device */
575 hdev = hci_alloc_dev();
576 if (!hdev) {
577 BT_ERR("Can't allocate HCI device");
578 return -ENOMEM;
579 }
580
581 hu->hdev = hdev;
582
c13854ce 583 hdev->bus = HCI_UART;
155961e8 584 hci_set_drvdata(hdev, hu);
1da177e4 585
aee61f7a
MH		 586 /* Only when vendor specific setup callback is provided, consider
587 * the manufacturer information valid. This avoids filling in the
588 * value for Ericsson when nothing is specified.
589 */
590 if (hu->proto->setup)
591 hdev->manufacturer = hu->proto->manufacturer;
592
1da177e4
LT		 593 hdev->open = hci_uart_open;
594 hdev->close = hci_uart_close;
595 hdev->flush = hci_uart_flush;
596 hdev->send = hci_uart_send_frame;
eb173809 597 hdev->setup = hci_uart_setup;
6935e0f5 598 SET_HCIDEV_DEV(hdev, hu->tty->dev);
1da177e4 599
63c7d09c
JH		 600 if (test_bit(HCI_UART_RAW_DEVICE, &hu->hdev_flags))
601 set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks);
602
6afd04ad
MH		 603 if (test_bit(HCI_UART_EXT_CONFIG, &hu->hdev_flags))
604 set_bit(HCI_QUIRK_EXTERNAL_CONFIG, &hdev->quirks);
605
a55e1f38 606 if (!test_bit(HCI_UART_RESET_ON_INIT, &hu->hdev_flags))
a6c511c6 607 set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);
a55e1f38 608
8a7a3fd6
MH		 609 if (test_bit(HCI_UART_CREATE_AMP, &hu->hdev_flags))
610 hdev->dev_type = HCI_AMP;
611 else
612 hdev->dev_type = HCI_BREDR;
613
9f2aee84
JH		 614 if (test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
615 return 0;
616
1da177e4
LT		 617 if (hci_register_dev(hdev) < 0) {
618 BT_ERR("Can't register HCI device");
619 hci_free_dev(hdev);
620 return -ENODEV;
621 }
622
9f2aee84
JH		 623 set_bit(HCI_UART_REGISTERED, &hu->flags);
624
1da177e4
LT		 625 return 0;
626}
627
628static int hci_uart_set_proto(struct hci_uart *hu, int id)
629{
4ee7ef19 630 const struct hci_uart_proto *p;
0372a662
MH		 631 int err;
632
1da177e4
LT		 633 p = hci_uart_get_proto(id);
634 if (!p)
635 return -EPROTONOSUPPORT;
636
637 err = p->open(hu);
638 if (err)
639 return err;
640
641 hu->proto = p;
84cb3df0 642 set_bit(HCI_UART_PROTO_READY, &hu->flags);
1da177e4
LT		 643
644 err = hci_uart_register_dev(hu);
645 if (err) {
84cb3df0 646 clear_bit(HCI_UART_PROTO_READY, &hu->flags);
1da177e4
LT		 647 p->close(hu);
648 return err;
649 }
0372a662 650
1da177e4
LT		 651 return 0;
652}
653
bb72bd68
MH		 654static int hci_uart_set_flags(struct hci_uart *hu, unsigned long flags)
655{
656 unsigned long valid_flags = BIT(HCI_UART_RAW_DEVICE) |
657 BIT(HCI_UART_RESET_ON_INIT) |
658 BIT(HCI_UART_CREATE_AMP) |
6afd04ad 659 BIT(HCI_UART_INIT_PENDING) |
fb2ce8d1
MH		 660 BIT(HCI_UART_EXT_CONFIG) |
661 BIT(HCI_UART_VND_DETECT);
bb72bd68 662
41533fe5 663 if (flags & ~valid_flags)
bb72bd68
MH		 664 return -EINVAL;
665
666 hu->hdev_flags = flags;
667
668 return 0;
669}
670
1da177e4
LT		 671/* hci_uart_tty_ioctl()
672 *
673 * Process IOCTL system call for the tty device.
674 *
675 * Arguments:
676 *
677 * tty pointer to tty instance data
678 * file pointer to open file object for device
679 * cmd IOCTL command code
680 * arg argument for IOCTL call (cmd dependent)
681 *
682 * Return Value: Command dependent
683 */
facf5225
MH		 684static int hci_uart_tty_ioctl(struct tty_struct *tty, struct file *file,
685 unsigned int cmd, unsigned long arg)
1da177e4 686{
dfe19d28 687 struct hci_uart *hu = tty->disc_data;
1da177e4
LT		 688 int err = 0;
689
690 BT_DBG("");
691
692 /* Verify the status of the device */
693 if (!hu)
694 return -EBADF;
695
696 switch (cmd) {
697 case HCIUARTSETPROTO:
698 if (!test_and_set_bit(HCI_UART_PROTO_SET, &hu->flags)) {
699 err = hci_uart_set_proto(hu, arg);
700 if (err) {
701 clear_bit(HCI_UART_PROTO_SET, &hu->flags);
702 return err;
703 }
0372a662 704 } else
1da177e4 705 return -EBUSY;
c33be3c3 706 break;
1da177e4
LT		 707
708 case HCIUARTGETPROTO:
709 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
710 return hu->proto->id;
711 return -EUNATCH;
0372a662 712
d2158744 713 case HCIUARTGETDEVICE:
c7e0c141 714 if (test_bit(HCI_UART_REGISTERED, &hu->flags))
d2158744
MH		 715 return hu->hdev->id;
716 return -EUNATCH;
717
63c7d09c
JH		 718 case HCIUARTSETFLAGS:
719 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
720 return -EBUSY;
bb72bd68
MH		 721 err = hci_uart_set_flags(hu, arg);
722 if (err)
723 return err;
63c7d09c
JH		 724 break;
725
726 case HCIUARTGETFLAGS:
727 return hu->hdev_flags;
728
1da177e4 729 default:
47afa7a5 730 err = n_tty_ioctl_helper(tty, file, cmd, arg);
1da177e4 731 break;
a20890d0 732 }
1da177e4
LT		 733
734 return err;
735}
736
737/*
738 * We don't provide read/write/poll interface for user space.
739 */
0372a662 740static ssize_t hci_uart_tty_read(struct tty_struct *tty, struct file *file,
facf5225 741 unsigned char __user *buf, size_t nr)
1da177e4
LT		 742{
743 return 0;
744}
0372a662
MH		 745
746static ssize_t hci_uart_tty_write(struct tty_struct *tty, struct file *file,
facf5225 747 const unsigned char *data, size_t count)
1da177e4
LT		 748{
749 return 0;
750}
0372a662
MH		 751
752static unsigned int hci_uart_tty_poll(struct tty_struct *tty,
facf5225 753 struct file *filp, poll_table *wait)
1da177e4
LT		 754{
755 return 0;
756}
757
1da177e4
LT		 758static int __init hci_uart_init(void)
759{
a352def2 760 static struct tty_ldisc_ops hci_uart_ldisc;
1da177e4
LT		 761 int err;
762
763 BT_INFO("HCI UART driver ver %s", VERSION);
764
765 /* Register the tty discipline */
766
acf50c5f 767 memset(&hci_uart_ldisc, 0, sizeof(hci_uart_ldisc));
0372a662
MH		 768 hci_uart_ldisc.magic = TTY_LDISC_MAGIC;
769 hci_uart_ldisc.name = "n_hci";
770 hci_uart_ldisc.open = hci_uart_tty_open;
771 hci_uart_ldisc.close = hci_uart_tty_close;
772 hci_uart_ldisc.read = hci_uart_tty_read;
773 hci_uart_ldisc.write = hci_uart_tty_write;
774 hci_uart_ldisc.ioctl = hci_uart_tty_ioctl;
775 hci_uart_ldisc.poll = hci_uart_tty_poll;
0372a662
MH		 776 hci_uart_ldisc.receive_buf = hci_uart_tty_receive;
777 hci_uart_ldisc.write_wakeup = hci_uart_tty_wakeup;
778 hci_uart_ldisc.owner = THIS_MODULE;
1da177e4 779
a08b15e6
VI		 780 err = tty_register_ldisc(N_HCI, &hci_uart_ldisc);
781 if (err) {
1da177e4
LT		 782 BT_ERR("HCI line discipline registration failed. (%d)", err);
783 return err;
784 }
785
786#ifdef CONFIG_BT_HCIUART_H4
787 h4_init();
788#endif
789#ifdef CONFIG_BT_HCIUART_BCSP
790 bcsp_init();
791#endif
166d2f6a
OBC		 792#ifdef CONFIG_BT_HCIUART_LL
793 ll_init();
794#endif
b3190df6
SS		 795#ifdef CONFIG_BT_HCIUART_ATH3K
796 ath_init();
797#endif
7dec65c8
JH		 798#ifdef CONFIG_BT_HCIUART_3WIRE
799 h5_init();
800#endif
ca93cee5
LP		 801#ifdef CONFIG_BT_HCIUART_INTEL
802 intel_init();
803#endif
bdd8818e
MH		 804#ifdef CONFIG_BT_HCIUART_BCM
805 bcm_init();
806#endif
0ff252c1
BYTK		 807#ifdef CONFIG_BT_HCIUART_QCA
808 qca_init();
809#endif
395174bb
LP		 810#ifdef CONFIG_BT_HCIUART_AG6XX
811 ag6xx_init();
812#endif
166d2f6a 813
1da177e4
LT		 814 return 0;
815}
816
817static void __exit hci_uart_exit(void)
818{
819 int err;
820
821#ifdef CONFIG_BT_HCIUART_H4
822 h4_deinit();
823#endif
824#ifdef CONFIG_BT_HCIUART_BCSP
825 bcsp_deinit();
826#endif
166d2f6a
OBC		 827#ifdef CONFIG_BT_HCIUART_LL
828 ll_deinit();
829#endif
b3190df6
SS		 830#ifdef CONFIG_BT_HCIUART_ATH3K
831 ath_deinit();
832#endif
7dec65c8
JH		 833#ifdef CONFIG_BT_HCIUART_3WIRE
834 h5_deinit();
835#endif
ca93cee5
LP		 836#ifdef CONFIG_BT_HCIUART_INTEL
837 intel_deinit();
838#endif
bdd8818e
MH		 839#ifdef CONFIG_BT_HCIUART_BCM
840 bcm_deinit();
841#endif
0ff252c1
BYTK		 842#ifdef CONFIG_BT_HCIUART_QCA
843 qca_deinit();
844#endif
395174bb
LP		 845#ifdef CONFIG_BT_HCIUART_AG6XX
846 ag6xx_deinit();
847#endif
1da177e4
LT		 848
849 /* Release tty registration of line discipline */
a08b15e6
VI		 850 err = tty_unregister_ldisc(N_HCI);
851 if (err)
1da177e4
LT		 852 BT_ERR("Can't unregister HCI line discipline (%d)", err);
853}
854
855module_init(hci_uart_init);
856module_exit(hci_uart_exit);
857
63fbd24e 858MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
1da177e4
LT		 859MODULE_DESCRIPTION("Bluetooth HCI UART driver ver " VERSION);
860MODULE_VERSION(VERSION);
861MODULE_LICENSE("GPL");
862MODULE_ALIAS_LDISC(N_HCI);
Linux 6.x block layer and io_uring tree(s)