1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * |
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> |
9 | */ |
10 | |
11 | #include <linux/module.h> |
12 | |
13 | #include <linux/kernel.h> |
14 | #include <linux/init.h> |
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> |
28 | #include <linux/firmware.h> |
29 | #include <linux/serdev.h> |
30 | |
31 | #include <net/bluetooth/bluetooth.h> |
32 | #include <net/bluetooth/hci_core.h> |
33 | |
34 | #include "btintel.h" |
35 | #include "btbcm.h" |
36 | #include "hci_uart.h" |
37 | |
38 | #define VERSION "2.3" |
39 | |
40 | static const struct hci_uart_proto *hup[HCI_UART_MAX_PROTO]; |
41 | |
42 | int hci_uart_register_proto(const struct hci_uart_proto *p) |
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; |
51 | |
52 | BT_INFO("HCI UART protocol %s registered" , p->name); |
53 | |
54 | return 0; |
55 | } |
56 | |
57 | int hci_uart_unregister_proto(const struct hci_uart_proto *p) |
58 | { |
59 | if (p->id >= HCI_UART_MAX_PROTO) |
60 | return -EINVAL; |
61 | |
62 | if (!hup[p->id]) |
63 | return -EINVAL; |
64 | |
65 | hup[p->id] = NULL; |
66 | |
67 | return 0; |
68 | } |
69 | |
70 | static const struct hci_uart_proto *hci_uart_get_proto(unsigned int id) |
71 | { |
72 | if (id >= HCI_UART_MAX_PROTO) |
73 | return NULL; |
74 | |
75 | return hup[id]; |
76 | } |
77 | |
78 | static inline void hci_uart_tx_complete(struct hci_uart *hu, int pkt_type) |
79 | { |
80 | struct hci_dev *hdev = hu->hdev; |
81 | |
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: |
93 | hdev->stat.sco_tx++; |
94 | break; |
95 | } |
96 | } |
97 | |
98 | static inline struct sk_buff *hci_uart_dequeue(struct hci_uart *hu) |
99 | { |
100 | struct sk_buff *skb = hu->tx_skb; |
101 | |
102 | if (!skb) { |
103 | percpu_down_read(sem: &hu->proto_lock); |
104 | |
105 | if (test_bit(HCI_UART_PROTO_READY, &hu->flags)) |
106 | skb = hu->proto->dequeue(hu); |
107 | |
108 | percpu_up_read(sem: &hu->proto_lock); |
109 | } else { |
110 | hu->tx_skb = NULL; |
111 | } |
112 | |
113 | return skb; |
114 | } |
115 | |
116 | int hci_uart_tx_wakeup(struct hci_uart *hu) |
117 | { |
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(sem: &hu->proto_lock)) |
125 | return 0; |
126 | |
127 | if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) |
128 | goto no_schedule; |
129 | |
130 | set_bit(HCI_UART_TX_WAKEUP, addr: &hu->tx_state); |
131 | if (test_and_set_bit(HCI_UART_SENDING, addr: &hu->tx_state)) |
132 | goto no_schedule; |
133 | |
134 | BT_DBG("" ); |
135 | |
136 | schedule_work(work: &hu->write_work); |
137 | |
138 | no_schedule: |
139 | percpu_up_read(sem: &hu->proto_lock); |
140 | |
141 | return 0; |
142 | } |
143 | EXPORT_SYMBOL_GPL(hci_uart_tx_wakeup); |
144 | |
145 | static 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 | |
156 | restart: |
157 | clear_bit(HCI_UART_TX_WAKEUP, addr: &hu->tx_state); |
158 | |
159 | while ((skb = hci_uart_dequeue(hu))) { |
160 | int len; |
161 | |
162 | set_bit(TTY_DO_WRITE_WAKEUP, addr: &tty->flags); |
163 | len = tty->ops->write(tty, skb->data, skb->len); |
164 | hdev->stat.byte_tx += len; |
165 | |
166 | skb_pull(skb, len); |
167 | if (skb->len) { |
168 | hu->tx_skb = skb; |
169 | break; |
170 | } |
171 | |
172 | hci_uart_tx_complete(hu, hci_skb_pkt_type(skb)); |
173 | kfree_skb(skb); |
174 | } |
175 | |
176 | clear_bit(HCI_UART_SENDING, addr: &hu->tx_state); |
177 | if (test_bit(HCI_UART_TX_WAKEUP, &hu->tx_state)) |
178 | goto restart; |
179 | |
180 | wake_up_bit(word: &hu->tx_state, HCI_UART_SENDING); |
181 | } |
182 | |
183 | void hci_uart_init_work(struct work_struct *work) |
184 | { |
185 | struct hci_uart *hu = container_of(work, struct hci_uart, init_ready); |
186 | int err; |
187 | struct hci_dev *hdev; |
188 | |
189 | if (!test_and_clear_bit(HCI_UART_INIT_PENDING, addr: &hu->hdev_flags)) |
190 | return; |
191 | |
192 | err = hci_register_dev(hdev: hu->hdev); |
193 | if (err < 0) { |
194 | BT_ERR("Can't register HCI device" ); |
195 | clear_bit(HCI_UART_PROTO_READY, addr: &hu->flags); |
196 | hu->proto->close(hu); |
197 | hdev = hu->hdev; |
198 | hu->hdev = NULL; |
199 | hci_free_dev(hdev); |
200 | return; |
201 | } |
202 | |
203 | set_bit(HCI_UART_REGISTERED, addr: &hu->flags); |
204 | } |
205 | |
206 | int 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(work: &hu->init_ready); |
212 | |
213 | return 0; |
214 | } |
215 | |
216 | int hci_uart_wait_until_sent(struct hci_uart *hu) |
217 | { |
218 | return wait_on_bit_timeout(word: &hu->tx_state, HCI_UART_SENDING, |
219 | TASK_INTERRUPTIBLE, |
220 | timeout: msecs_to_jiffies(m: 2000)); |
221 | } |
222 | |
223 | /* ------- Interface to HCI layer ------ */ |
224 | /* Reset device */ |
225 | static int hci_uart_flush(struct hci_dev *hdev) |
226 | { |
227 | struct hci_uart *hu = hci_get_drvdata(hdev); |
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(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); |
238 | tty_driver_flush_buffer(tty); |
239 | |
240 | percpu_down_read(sem: &hu->proto_lock); |
241 | |
242 | if (test_bit(HCI_UART_PROTO_READY, &hu->flags)) |
243 | hu->proto->flush(hu); |
244 | |
245 | percpu_up_read(sem: &hu->proto_lock); |
246 | |
247 | return 0; |
248 | } |
249 | |
250 | /* Initialize device */ |
251 | static 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 | |
261 | /* Close device */ |
262 | static int hci_uart_close(struct hci_dev *hdev) |
263 | { |
264 | BT_DBG("hdev %p" , hdev); |
265 | |
266 | hci_uart_flush(hdev); |
267 | hdev->flush = NULL; |
268 | return 0; |
269 | } |
270 | |
271 | /* Send frames from HCI layer */ |
272 | static int hci_uart_send_frame(struct hci_dev *hdev, struct sk_buff *skb) |
273 | { |
274 | struct hci_uart *hu = hci_get_drvdata(hdev); |
275 | |
276 | BT_DBG("%s: type %d len %d" , hdev->name, hci_skb_pkt_type(skb), |
277 | skb->len); |
278 | |
279 | percpu_down_read(sem: &hu->proto_lock); |
280 | |
281 | if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) { |
282 | percpu_up_read(sem: &hu->proto_lock); |
283 | return -EUNATCH; |
284 | } |
285 | |
286 | hu->proto->enqueue(hu, skb); |
287 | percpu_up_read(sem: &hu->proto_lock); |
288 | |
289 | hci_uart_tx_wakeup(hu); |
290 | |
291 | return 0; |
292 | } |
293 | |
294 | /* Check the underlying device or tty has flow control support */ |
295 | bool 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 | |
307 | /* Flow control or un-flow control the device */ |
308 | void 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 | |
316 | if (hu->serdev) { |
317 | serdev_device_set_flow_control(hu->serdev, !enable); |
318 | serdev_device_set_rts(serdev: hu->serdev, enable: !enable); |
319 | return; |
320 | } |
321 | |
322 | if (enable) { |
323 | /* Disable hardware flow control */ |
324 | ktermios = tty->termios; |
325 | ktermios.c_cflag &= ~CRTSCTS; |
326 | tty_set_termios(tty, kt: &ktermios); |
327 | BT_DBG("Disabling hardware flow control: %s" , |
328 | (tty->termios.c_cflag & CRTSCTS) ? "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 | tty_set_termios(tty, kt: &ktermios); |
361 | BT_DBG("Enabling hardware flow control: %s" , |
362 | !(tty->termios.c_cflag & CRTSCTS) ? "failed" : "success" ); |
363 | } |
364 | } |
365 | |
366 | void 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 | |
373 | void 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; |
380 | tty_termios_encode_baud_rate(termios: &ktermios, ibaud: speed, obaud: speed); |
381 | |
382 | /* tty_set_termios() return not checked as it is always 0 */ |
383 | tty_set_termios(tty, kt: &ktermios); |
384 | |
385 | BT_DBG("%s: New tty speeds: %d/%d" , hu->hdev->name, |
386 | tty->termios.c_ispeed, tty->termios.c_ospeed); |
387 | } |
388 | |
389 | static int hci_uart_setup(struct hci_dev *hdev) |
390 | { |
391 | struct hci_uart *hu = hci_get_drvdata(hdev); |
392 | struct hci_rp_read_local_version *ver; |
393 | struct sk_buff *skb; |
394 | unsigned int speed; |
395 | int err; |
396 | |
397 | /* Init speed if any */ |
398 | if (hu->init_speed) |
399 | speed = hu->init_speed; |
400 | else if (hu->proto->init_speed) |
401 | speed = hu->proto->init_speed; |
402 | else |
403 | speed = 0; |
404 | |
405 | if (speed) |
406 | hci_uart_set_baudrate(hu, speed); |
407 | |
408 | /* Operational speed if any */ |
409 | if (hu->oper_speed) |
410 | speed = hu->oper_speed; |
411 | else if (hu->proto->oper_speed) |
412 | speed = hu->proto->oper_speed; |
413 | else |
414 | speed = 0; |
415 | |
416 | if (hu->proto->set_baudrate && speed) { |
417 | err = hu->proto->set_baudrate(hu, speed); |
418 | if (!err) |
419 | hci_uart_set_baudrate(hu, speed); |
420 | } |
421 | |
422 | if (hu->proto->setup) |
423 | return hu->proto->setup(hu); |
424 | |
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, plen: 0, NULL, |
429 | HCI_INIT_TIMEOUT); |
430 | if (IS_ERR(ptr: 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)) { |
445 | #ifdef CONFIG_BT_HCIUART_INTEL |
446 | case 2: |
447 | hdev->set_bdaddr = btintel_set_bdaddr; |
448 | btintel_check_bdaddr(hdev); |
449 | break; |
450 | #endif |
451 | #ifdef CONFIG_BT_HCIUART_BCM |
452 | case 15: |
453 | hdev->set_bdaddr = btbcm_set_bdaddr; |
454 | btbcm_check_bdaddr(hdev); |
455 | break; |
456 | #endif |
457 | default: |
458 | break; |
459 | } |
460 | |
461 | done: |
462 | kfree_skb(skb); |
463 | return 0; |
464 | } |
465 | |
466 | /* ------ LDISC part ------ */ |
467 | /* hci_uart_tty_open |
468 | * |
469 | * Called when line discipline changed to HCI_UART. |
470 | * |
471 | * Arguments: |
472 | * tty pointer to tty info structure |
473 | * Return Value: |
474 | * 0 if success, otherwise error code |
475 | */ |
476 | static int hci_uart_tty_open(struct tty_struct *tty) |
477 | { |
478 | struct hci_uart *hu; |
479 | |
480 | BT_DBG("tty %p" , tty); |
481 | |
482 | if (!capable(CAP_NET_ADMIN)) |
483 | return -EPERM; |
484 | |
485 | /* Error if the tty has no write op instead of leaving an exploitable |
486 | * hole |
487 | */ |
488 | if (tty->ops->write == NULL) |
489 | return -EOPNOTSUPP; |
490 | |
491 | hu = kzalloc(size: sizeof(struct hci_uart), GFP_KERNEL); |
492 | if (!hu) { |
493 | BT_ERR("Can't allocate control structure" ); |
494 | return -ENFILE; |
495 | } |
496 | if (percpu_init_rwsem(&hu->proto_lock)) { |
497 | BT_ERR("Can't allocate semaphore structure" ); |
498 | kfree(objp: hu); |
499 | return -ENOMEM; |
500 | } |
501 | |
502 | tty->disc_data = hu; |
503 | hu->tty = tty; |
504 | tty->receive_room = 65536; |
505 | |
506 | /* disable alignment support by default */ |
507 | hu->alignment = 1; |
508 | hu->padding = 0; |
509 | |
510 | INIT_WORK(&hu->init_ready, hci_uart_init_work); |
511 | INIT_WORK(&hu->write_work, hci_uart_write_work); |
512 | |
513 | /* Flush any pending characters in the driver */ |
514 | tty_driver_flush_buffer(tty); |
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 | */ |
524 | static void hci_uart_tty_close(struct tty_struct *tty) |
525 | { |
526 | struct hci_uart *hu = tty->disc_data; |
527 | struct hci_dev *hdev; |
528 | |
529 | BT_DBG("tty %p" , tty); |
530 | |
531 | /* Detach from the tty */ |
532 | tty->disc_data = NULL; |
533 | |
534 | if (!hu) |
535 | return; |
536 | |
537 | hdev = hu->hdev; |
538 | if (hdev) |
539 | hci_uart_close(hdev); |
540 | |
541 | if (test_bit(HCI_UART_PROTO_READY, &hu->flags)) { |
542 | percpu_down_write(&hu->proto_lock); |
543 | clear_bit(HCI_UART_PROTO_READY, addr: &hu->flags); |
544 | percpu_up_write(&hu->proto_lock); |
545 | |
546 | cancel_work_sync(work: &hu->init_ready); |
547 | cancel_work_sync(work: &hu->write_work); |
548 | |
549 | if (hdev) { |
550 | if (test_bit(HCI_UART_REGISTERED, &hu->flags)) |
551 | hci_unregister_dev(hdev); |
552 | hci_free_dev(hdev); |
553 | } |
554 | hu->proto->close(hu); |
555 | } |
556 | clear_bit(HCI_UART_PROTO_SET, addr: &hu->flags); |
557 | |
558 | percpu_free_rwsem(&hu->proto_lock); |
559 | |
560 | kfree(objp: hu); |
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 | */ |
571 | static void hci_uart_tty_wakeup(struct tty_struct *tty) |
572 | { |
573 | struct hci_uart *hu = tty->disc_data; |
574 | |
575 | BT_DBG("" ); |
576 | |
577 | if (!hu) |
578 | return; |
579 | |
580 | clear_bit(TTY_DO_WRITE_WAKEUP, addr: &tty->flags); |
581 | |
582 | if (tty != hu->tty) |
583 | return; |
584 | |
585 | if (test_bit(HCI_UART_PROTO_READY, &hu->flags)) |
586 | hci_uart_tx_wakeup(hu); |
587 | } |
588 | |
589 | /* hci_uart_tty_receive() |
590 | * |
591 | * Called by tty low level driver when receive data is |
592 | * available. |
593 | * |
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 |
598 | * |
599 | * Return Value: None |
600 | */ |
601 | static void hci_uart_tty_receive(struct tty_struct *tty, const u8 *data, |
602 | const u8 *flags, size_t count) |
603 | { |
604 | struct hci_uart *hu = tty->disc_data; |
605 | |
606 | if (!hu || tty != hu->tty) |
607 | return; |
608 | |
609 | percpu_down_read(sem: &hu->proto_lock); |
610 | |
611 | if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) { |
612 | percpu_up_read(sem: &hu->proto_lock); |
613 | return; |
614 | } |
615 | |
616 | /* It does not need a lock here as it is already protected by a mutex in |
617 | * tty caller |
618 | */ |
619 | hu->proto->recv(hu, data, count); |
620 | percpu_up_read(sem: &hu->proto_lock); |
621 | |
622 | if (hu->hdev) |
623 | hu->hdev->stat.byte_rx += count; |
624 | |
625 | tty_unthrottle(tty); |
626 | } |
627 | |
628 | static int hci_uart_register_dev(struct hci_uart *hu) |
629 | { |
630 | struct hci_dev *hdev; |
631 | int err; |
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 | |
644 | hdev->bus = HCI_UART; |
645 | hci_set_drvdata(hdev, data: hu); |
646 | |
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 | |
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; |
658 | hdev->setup = hci_uart_setup; |
659 | SET_HCIDEV_DEV(hdev, hu->tty->dev); |
660 | |
661 | if (test_bit(HCI_UART_RAW_DEVICE, &hu->hdev_flags)) |
662 | set_bit(nr: HCI_QUIRK_RAW_DEVICE, addr: &hdev->quirks); |
663 | |
664 | if (test_bit(HCI_UART_EXT_CONFIG, &hu->hdev_flags)) |
665 | set_bit(nr: HCI_QUIRK_EXTERNAL_CONFIG, addr: &hdev->quirks); |
666 | |
667 | if (!test_bit(HCI_UART_RESET_ON_INIT, &hu->hdev_flags)) |
668 | set_bit(nr: HCI_QUIRK_RESET_ON_CLOSE, addr: &hdev->quirks); |
669 | |
670 | if (test_bit(HCI_UART_CREATE_AMP, &hu->hdev_flags)) |
671 | hdev->dev_type = HCI_AMP; |
672 | else |
673 | hdev->dev_type = HCI_PRIMARY; |
674 | |
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 | |
685 | if (test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags)) |
686 | return 0; |
687 | |
688 | if (hci_register_dev(hdev) < 0) { |
689 | BT_ERR("Can't register HCI device" ); |
690 | hu->proto->close(hu); |
691 | hu->hdev = NULL; |
692 | hci_free_dev(hdev); |
693 | return -ENODEV; |
694 | } |
695 | |
696 | set_bit(HCI_UART_REGISTERED, addr: &hu->flags); |
697 | |
698 | return 0; |
699 | } |
700 | |
701 | static int hci_uart_set_proto(struct hci_uart *hu, int id) |
702 | { |
703 | const struct hci_uart_proto *p; |
704 | int err; |
705 | |
706 | p = hci_uart_get_proto(id); |
707 | if (!p) |
708 | return -EPROTONOSUPPORT; |
709 | |
710 | hu->proto = p; |
711 | |
712 | err = hci_uart_register_dev(hu); |
713 | if (err) { |
714 | return err; |
715 | } |
716 | |
717 | set_bit(HCI_UART_PROTO_READY, addr: &hu->flags); |
718 | return 0; |
719 | } |
720 | |
721 | static 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) | |
726 | BIT(HCI_UART_INIT_PENDING) | |
727 | BIT(HCI_UART_EXT_CONFIG) | |
728 | BIT(HCI_UART_VND_DETECT); |
729 | |
730 | if (flags & ~valid_flags) |
731 | return -EINVAL; |
732 | |
733 | hu->hdev_flags = flags; |
734 | |
735 | return 0; |
736 | } |
737 | |
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 |
745 | * cmd IOCTL command code |
746 | * arg argument for IOCTL call (cmd dependent) |
747 | * |
748 | * Return Value: Command dependent |
749 | */ |
750 | static int hci_uart_tty_ioctl(struct tty_struct *tty, unsigned int cmd, |
751 | unsigned long arg) |
752 | { |
753 | struct hci_uart *hu = tty->disc_data; |
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, addr: &hu->flags)) { |
765 | err = hci_uart_set_proto(hu, id: arg); |
766 | if (err) |
767 | clear_bit(HCI_UART_PROTO_SET, addr: &hu->flags); |
768 | } else |
769 | err = -EBUSY; |
770 | break; |
771 | |
772 | case HCIUARTGETPROTO: |
773 | if (test_bit(HCI_UART_PROTO_SET, &hu->flags) && |
774 | test_bit(HCI_UART_PROTO_READY, &hu->flags)) |
775 | err = hu->proto->id; |
776 | else |
777 | err = -EUNATCH; |
778 | break; |
779 | |
780 | case HCIUARTGETDEVICE: |
781 | if (test_bit(HCI_UART_REGISTERED, &hu->flags)) |
782 | err = hu->hdev->id; |
783 | else |
784 | err = -EUNATCH; |
785 | break; |
786 | |
787 | case HCIUARTSETFLAGS: |
788 | if (test_bit(HCI_UART_PROTO_SET, &hu->flags)) |
789 | err = -EBUSY; |
790 | else |
791 | err = hci_uart_set_flags(hu, flags: arg); |
792 | break; |
793 | |
794 | case HCIUARTGETFLAGS: |
795 | err = hu->hdev_flags; |
796 | break; |
797 | |
798 | default: |
799 | err = n_tty_ioctl_helper(tty, cmd, arg); |
800 | break; |
801 | } |
802 | |
803 | return err; |
804 | } |
805 | |
806 | /* |
807 | * We don't provide read/write/poll interface for user space. |
808 | */ |
809 | static ssize_t hci_uart_tty_read(struct tty_struct *tty, struct file *file, |
810 | u8 *buf, size_t nr, void **cookie, |
811 | unsigned long offset) |
812 | { |
813 | return 0; |
814 | } |
815 | |
816 | static ssize_t hci_uart_tty_write(struct tty_struct *tty, struct file *file, |
817 | const u8 *data, size_t count) |
818 | { |
819 | return 0; |
820 | } |
821 | |
822 | static struct tty_ldisc_ops hci_uart_ldisc = { |
823 | .owner = THIS_MODULE, |
824 | .num = N_HCI, |
825 | .name = "n_hci" , |
826 | .open = hci_uart_tty_open, |
827 | .close = hci_uart_tty_close, |
828 | .read = hci_uart_tty_read, |
829 | .write = hci_uart_tty_write, |
830 | .ioctl = hci_uart_tty_ioctl, |
831 | .compat_ioctl = hci_uart_tty_ioctl, |
832 | .receive_buf = hci_uart_tty_receive, |
833 | .write_wakeup = hci_uart_tty_wakeup, |
834 | }; |
835 | |
836 | static int __init hci_uart_init(void) |
837 | { |
838 | int err; |
839 | |
840 | BT_INFO("HCI UART driver ver %s" , VERSION); |
841 | |
842 | /* Register the tty discipline */ |
843 | err = tty_register_ldisc(new_ldisc: &hci_uart_ldisc); |
844 | if (err) { |
845 | BT_ERR("HCI line discipline registration failed. (%d)" , err); |
846 | return err; |
847 | } |
848 | |
849 | #ifdef CONFIG_BT_HCIUART_H4 |
850 | h4_init(); |
851 | #endif |
852 | #ifdef CONFIG_BT_HCIUART_BCSP |
853 | bcsp_init(); |
854 | #endif |
855 | #ifdef CONFIG_BT_HCIUART_LL |
856 | ll_init(); |
857 | #endif |
858 | #ifdef CONFIG_BT_HCIUART_ATH3K |
859 | ath_init(); |
860 | #endif |
861 | #ifdef CONFIG_BT_HCIUART_3WIRE |
862 | h5_init(); |
863 | #endif |
864 | #ifdef CONFIG_BT_HCIUART_INTEL |
865 | intel_init(); |
866 | #endif |
867 | #ifdef CONFIG_BT_HCIUART_BCM |
868 | bcm_init(); |
869 | #endif |
870 | #ifdef CONFIG_BT_HCIUART_QCA |
871 | qca_init(); |
872 | #endif |
873 | #ifdef CONFIG_BT_HCIUART_AG6XX |
874 | ag6xx_init(); |
875 | #endif |
876 | #ifdef CONFIG_BT_HCIUART_MRVL |
877 | mrvl_init(); |
878 | #endif |
879 | |
880 | return 0; |
881 | } |
882 | |
883 | static void __exit hci_uart_exit(void) |
884 | { |
885 | #ifdef CONFIG_BT_HCIUART_H4 |
886 | h4_deinit(); |
887 | #endif |
888 | #ifdef CONFIG_BT_HCIUART_BCSP |
889 | bcsp_deinit(); |
890 | #endif |
891 | #ifdef CONFIG_BT_HCIUART_LL |
892 | ll_deinit(); |
893 | #endif |
894 | #ifdef CONFIG_BT_HCIUART_ATH3K |
895 | ath_deinit(); |
896 | #endif |
897 | #ifdef CONFIG_BT_HCIUART_3WIRE |
898 | h5_deinit(); |
899 | #endif |
900 | #ifdef CONFIG_BT_HCIUART_INTEL |
901 | intel_deinit(); |
902 | #endif |
903 | #ifdef CONFIG_BT_HCIUART_BCM |
904 | bcm_deinit(); |
905 | #endif |
906 | #ifdef CONFIG_BT_HCIUART_QCA |
907 | qca_deinit(); |
908 | #endif |
909 | #ifdef CONFIG_BT_HCIUART_AG6XX |
910 | ag6xx_deinit(); |
911 | #endif |
912 | #ifdef CONFIG_BT_HCIUART_MRVL |
913 | mrvl_deinit(); |
914 | #endif |
915 | |
916 | tty_unregister_ldisc(ldisc: &hci_uart_ldisc); |
917 | } |
918 | |
919 | module_init(hci_uart_init); |
920 | module_exit(hci_uart_exit); |
921 | |
922 | MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>" ); |
923 | MODULE_DESCRIPTION("Bluetooth HCI UART driver ver " VERSION); |
924 | MODULE_VERSION(VERSION); |
925 | MODULE_LICENSE("GPL" ); |
926 | MODULE_ALIAS_LDISC(N_HCI); |
927 | |