Commit | Line | Data |
---|---|---|
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> | |
30 | #include <linux/sched.h> | |
31 | #include <linux/types.h> | |
32 | #include <linux/fcntl.h> | |
33 | #include <linux/interrupt.h> | |
34 | #include <linux/ptrace.h> | |
35 | #include <linux/poll.h> | |
36 | ||
37 | #include <linux/slab.h> | |
38 | #include <linux/tty.h> | |
39 | #include <linux/errno.h> | |
40 | #include <linux/string.h> | |
41 | #include <linux/signal.h> | |
42 | #include <linux/ioctl.h> | |
43 | #include <linux/skbuff.h> | |
44 | ||
45 | #include <net/bluetooth/bluetooth.h> | |
46 | #include <net/bluetooth/hci_core.h> | |
47 | ||
48 | #include "hci_uart.h" | |
49 | ||
50 | #ifndef CONFIG_BT_HCIUART_DEBUG | |
51 | #undef BT_DBG | |
52 | #define BT_DBG( A... ) | |
1da177e4 LT |
53 | #endif |
54 | ||
0372a662 MH |
55 | #define VERSION "2.2" |
56 | ||
1da177e4 LT |
57 | static int reset = 0; |
58 | ||
59 | static struct hci_uart_proto *hup[HCI_UART_MAX_PROTO]; | |
60 | ||
61 | int hci_uart_register_proto(struct hci_uart_proto *p) | |
62 | { | |
63 | if (p->id >= HCI_UART_MAX_PROTO) | |
64 | return -EINVAL; | |
65 | ||
66 | if (hup[p->id]) | |
67 | return -EEXIST; | |
68 | ||
69 | hup[p->id] = p; | |
0372a662 | 70 | |
1da177e4 LT |
71 | return 0; |
72 | } | |
73 | ||
74 | int hci_uart_unregister_proto(struct hci_uart_proto *p) | |
75 | { | |
76 | if (p->id >= HCI_UART_MAX_PROTO) | |
77 | return -EINVAL; | |
78 | ||
79 | if (!hup[p->id]) | |
80 | return -EINVAL; | |
81 | ||
82 | hup[p->id] = NULL; | |
0372a662 | 83 | |
1da177e4 LT |
84 | return 0; |
85 | } | |
86 | ||
87 | static struct hci_uart_proto *hci_uart_get_proto(unsigned int id) | |
88 | { | |
89 | if (id >= HCI_UART_MAX_PROTO) | |
90 | return NULL; | |
0372a662 | 91 | |
1da177e4 LT |
92 | return hup[id]; |
93 | } | |
94 | ||
95 | static inline void hci_uart_tx_complete(struct hci_uart *hu, int pkt_type) | |
96 | { | |
97 | struct hci_dev *hdev = hu->hdev; | |
0372a662 | 98 | |
1da177e4 LT |
99 | /* Update HCI stat counters */ |
100 | switch (pkt_type) { | |
101 | case HCI_COMMAND_PKT: | |
102 | hdev->stat.cmd_tx++; | |
103 | break; | |
104 | ||
105 | case HCI_ACLDATA_PKT: | |
106 | hdev->stat.acl_tx++; | |
107 | break; | |
108 | ||
109 | case HCI_SCODATA_PKT: | |
110 | hdev->stat.cmd_tx++; | |
111 | break; | |
112 | } | |
113 | } | |
114 | ||
115 | static inline struct sk_buff *hci_uart_dequeue(struct hci_uart *hu) | |
116 | { | |
117 | struct sk_buff *skb = hu->tx_skb; | |
0372a662 | 118 | |
1da177e4 LT |
119 | if (!skb) |
120 | skb = hu->proto->dequeue(hu); | |
121 | else | |
122 | hu->tx_skb = NULL; | |
0372a662 | 123 | |
1da177e4 LT |
124 | return skb; |
125 | } | |
126 | ||
127 | int hci_uart_tx_wakeup(struct hci_uart *hu) | |
128 | { | |
129 | struct tty_struct *tty = hu->tty; | |
130 | struct hci_dev *hdev = hu->hdev; | |
131 | struct sk_buff *skb; | |
0372a662 | 132 | |
1da177e4 LT |
133 | if (test_and_set_bit(HCI_UART_SENDING, &hu->tx_state)) { |
134 | set_bit(HCI_UART_TX_WAKEUP, &hu->tx_state); | |
135 | return 0; | |
136 | } | |
137 | ||
138 | BT_DBG(""); | |
139 | ||
140 | restart: | |
141 | clear_bit(HCI_UART_TX_WAKEUP, &hu->tx_state); | |
142 | ||
143 | while ((skb = hci_uart_dequeue(hu))) { | |
144 | int len; | |
0372a662 | 145 | |
1da177e4 LT |
146 | set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); |
147 | len = tty->driver->write(tty, skb->data, skb->len); | |
148 | hdev->stat.byte_tx += len; | |
149 | ||
150 | skb_pull(skb, len); | |
151 | if (skb->len) { | |
152 | hu->tx_skb = skb; | |
153 | break; | |
154 | } | |
0372a662 | 155 | |
0d48d939 | 156 | hci_uart_tx_complete(hu, bt_cb(skb)->pkt_type); |
1da177e4 | 157 | kfree_skb(skb); |
0372a662 MH |
158 | } |
159 | ||
1da177e4 LT |
160 | if (test_bit(HCI_UART_TX_WAKEUP, &hu->tx_state)) |
161 | goto restart; | |
162 | ||
163 | clear_bit(HCI_UART_SENDING, &hu->tx_state); | |
164 | return 0; | |
165 | } | |
166 | ||
167 | /* ------- Interface to HCI layer ------ */ | |
168 | /* Initialize device */ | |
169 | static int hci_uart_open(struct hci_dev *hdev) | |
170 | { | |
171 | BT_DBG("%s %p", hdev->name, hdev); | |
172 | ||
173 | /* Nothing to do for UART driver */ | |
174 | ||
175 | set_bit(HCI_RUNNING, &hdev->flags); | |
0372a662 | 176 | |
1da177e4 LT |
177 | return 0; |
178 | } | |
179 | ||
180 | /* Reset device */ | |
181 | static int hci_uart_flush(struct hci_dev *hdev) | |
182 | { | |
183 | struct hci_uart *hu = (struct hci_uart *) hdev->driver_data; | |
184 | struct tty_struct *tty = hu->tty; | |
185 | ||
186 | BT_DBG("hdev %p tty %p", hdev, tty); | |
187 | ||
188 | if (hu->tx_skb) { | |
189 | kfree_skb(hu->tx_skb); hu->tx_skb = NULL; | |
190 | } | |
191 | ||
192 | /* Flush any pending characters in the driver and discipline. */ | |
193 | tty_ldisc_flush(tty); | |
420cc350 | 194 | if (tty->driver && tty->driver->flush_buffer) |
1da177e4 LT |
195 | tty->driver->flush_buffer(tty); |
196 | ||
197 | if (test_bit(HCI_UART_PROTO_SET, &hu->flags)) | |
198 | hu->proto->flush(hu); | |
199 | ||
200 | return 0; | |
201 | } | |
202 | ||
203 | /* Close device */ | |
204 | static int hci_uart_close(struct hci_dev *hdev) | |
205 | { | |
206 | BT_DBG("hdev %p", hdev); | |
207 | ||
208 | if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags)) | |
209 | return 0; | |
210 | ||
211 | hci_uart_flush(hdev); | |
212 | return 0; | |
213 | } | |
214 | ||
215 | /* Send frames from HCI layer */ | |
216 | static int hci_uart_send_frame(struct sk_buff *skb) | |
217 | { | |
218 | struct hci_dev* hdev = (struct hci_dev *) skb->dev; | |
219 | struct tty_struct *tty; | |
220 | struct hci_uart *hu; | |
221 | ||
222 | if (!hdev) { | |
223 | BT_ERR("Frame for uknown device (hdev=NULL)"); | |
224 | return -ENODEV; | |
225 | } | |
226 | ||
227 | if (!test_bit(HCI_RUNNING, &hdev->flags)) | |
228 | return -EBUSY; | |
229 | ||
230 | hu = (struct hci_uart *) hdev->driver_data; | |
231 | tty = hu->tty; | |
232 | ||
0d48d939 | 233 | BT_DBG("%s: type %d len %d", hdev->name, bt_cb(skb)->pkt_type, skb->len); |
1da177e4 LT |
234 | |
235 | hu->proto->enqueue(hu, skb); | |
236 | ||
237 | hci_uart_tx_wakeup(hu); | |
0372a662 | 238 | |
1da177e4 LT |
239 | return 0; |
240 | } | |
241 | ||
242 | static void hci_uart_destruct(struct hci_dev *hdev) | |
243 | { | |
244 | struct hci_uart *hu; | |
245 | ||
0372a662 MH |
246 | if (!hdev) |
247 | return; | |
1da177e4 LT |
248 | |
249 | BT_DBG("%s", hdev->name); | |
250 | ||
251 | hu = (struct hci_uart *) hdev->driver_data; | |
252 | kfree(hu); | |
253 | } | |
254 | ||
255 | /* ------ LDISC part ------ */ | |
256 | /* hci_uart_tty_open | |
257 | * | |
258 | * Called when line discipline changed to HCI_UART. | |
259 | * | |
260 | * Arguments: | |
261 | * tty pointer to tty info structure | |
262 | * Return Value: | |
263 | * 0 if success, otherwise error code | |
264 | */ | |
265 | static int hci_uart_tty_open(struct tty_struct *tty) | |
266 | { | |
267 | struct hci_uart *hu = (void *) tty->disc_data; | |
268 | ||
269 | BT_DBG("tty %p", tty); | |
270 | ||
271 | if (hu) | |
272 | return -EEXIST; | |
273 | ||
089b1dbb | 274 | if (!(hu = kzalloc(sizeof(struct hci_uart), GFP_KERNEL))) { |
1da177e4 LT |
275 | BT_ERR("Can't allocate controll structure"); |
276 | return -ENFILE; | |
277 | } | |
0372a662 | 278 | |
1da177e4 LT |
279 | tty->disc_data = hu; |
280 | hu->tty = tty; | |
33f0f88f | 281 | tty->receive_room = 65536; |
1da177e4 LT |
282 | |
283 | spin_lock_init(&hu->rx_lock); | |
284 | ||
285 | /* Flush any pending characters in the driver and line discipline. */ | |
0372a662 | 286 | |
1da177e4 LT |
287 | /* FIXME: why is this needed. Note don't use ldisc_ref here as the |
288 | open path is before the ldisc is referencable */ | |
0372a662 | 289 | |
1da177e4 LT |
290 | if (tty->ldisc.flush_buffer) |
291 | tty->ldisc.flush_buffer(tty); | |
292 | ||
420cc350 | 293 | if (tty->driver && tty->driver->flush_buffer) |
1da177e4 LT |
294 | tty->driver->flush_buffer(tty); |
295 | ||
296 | return 0; | |
297 | } | |
298 | ||
299 | /* hci_uart_tty_close() | |
300 | * | |
301 | * Called when the line discipline is changed to something | |
302 | * else, the tty is closed, or the tty detects a hangup. | |
303 | */ | |
304 | static void hci_uart_tty_close(struct tty_struct *tty) | |
305 | { | |
306 | struct hci_uart *hu = (void *)tty->disc_data; | |
307 | ||
308 | BT_DBG("tty %p", tty); | |
309 | ||
310 | /* Detach from the tty */ | |
311 | tty->disc_data = NULL; | |
312 | ||
313 | if (hu) { | |
314 | struct hci_dev *hdev = hu->hdev; | |
315 | hci_uart_close(hdev); | |
316 | ||
317 | if (test_and_clear_bit(HCI_UART_PROTO_SET, &hu->flags)) { | |
318 | hu->proto->close(hu); | |
319 | hci_unregister_dev(hdev); | |
320 | hci_free_dev(hdev); | |
321 | } | |
322 | } | |
323 | } | |
324 | ||
325 | /* hci_uart_tty_wakeup() | |
326 | * | |
327 | * Callback for transmit wakeup. Called when low level | |
328 | * device driver can accept more send data. | |
329 | * | |
330 | * Arguments: tty pointer to associated tty instance data | |
331 | * Return Value: None | |
332 | */ | |
333 | static void hci_uart_tty_wakeup(struct tty_struct *tty) | |
334 | { | |
335 | struct hci_uart *hu = (void *)tty->disc_data; | |
336 | ||
337 | BT_DBG(""); | |
338 | ||
339 | if (!hu) | |
340 | return; | |
341 | ||
342 | clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); | |
343 | ||
344 | if (tty != hu->tty) | |
345 | return; | |
346 | ||
347 | if (test_bit(HCI_UART_PROTO_SET, &hu->flags)) | |
348 | hci_uart_tx_wakeup(hu); | |
349 | } | |
350 | ||
1da177e4 LT |
351 | /* hci_uart_tty_receive() |
352 | * | |
353 | * Called by tty low level driver when receive data is | |
354 | * available. | |
355 | * | |
356 | * Arguments: tty pointer to tty isntance data | |
357 | * data pointer to received data | |
358 | * flags pointer to flags for data | |
359 | * count count of received data in bytes | |
360 | * | |
361 | * Return Value: None | |
362 | */ | |
363 | static void hci_uart_tty_receive(struct tty_struct *tty, const __u8 *data, char *flags, int count) | |
364 | { | |
365 | struct hci_uart *hu = (void *)tty->disc_data; | |
0372a662 | 366 | |
1da177e4 LT |
367 | if (!hu || tty != hu->tty) |
368 | return; | |
369 | ||
370 | if (!test_bit(HCI_UART_PROTO_SET, &hu->flags)) | |
371 | return; | |
0372a662 | 372 | |
1da177e4 LT |
373 | spin_lock(&hu->rx_lock); |
374 | hu->proto->recv(hu, (void *) data, count); | |
375 | hu->hdev->stat.byte_rx += count; | |
376 | spin_unlock(&hu->rx_lock); | |
377 | ||
378 | if (test_and_clear_bit(TTY_THROTTLED,&tty->flags) && tty->driver->unthrottle) | |
379 | tty->driver->unthrottle(tty); | |
380 | } | |
381 | ||
382 | static int hci_uart_register_dev(struct hci_uart *hu) | |
383 | { | |
384 | struct hci_dev *hdev; | |
385 | ||
386 | BT_DBG(""); | |
387 | ||
388 | /* Initialize and register HCI device */ | |
389 | hdev = hci_alloc_dev(); | |
390 | if (!hdev) { | |
391 | BT_ERR("Can't allocate HCI device"); | |
392 | return -ENOMEM; | |
393 | } | |
394 | ||
395 | hu->hdev = hdev; | |
396 | ||
397 | hdev->type = HCI_UART; | |
398 | hdev->driver_data = hu; | |
399 | ||
400 | hdev->open = hci_uart_open; | |
401 | hdev->close = hci_uart_close; | |
402 | hdev->flush = hci_uart_flush; | |
403 | hdev->send = hci_uart_send_frame; | |
404 | hdev->destruct = hci_uart_destruct; | |
405 | ||
406 | hdev->owner = THIS_MODULE; | |
407 | ||
408 | if (reset) | |
409 | set_bit(HCI_QUIRK_RESET_ON_INIT, &hdev->quirks); | |
410 | ||
411 | if (hci_register_dev(hdev) < 0) { | |
412 | BT_ERR("Can't register HCI device"); | |
413 | hci_free_dev(hdev); | |
414 | return -ENODEV; | |
415 | } | |
416 | ||
417 | return 0; | |
418 | } | |
419 | ||
420 | static int hci_uart_set_proto(struct hci_uart *hu, int id) | |
421 | { | |
422 | struct hci_uart_proto *p; | |
0372a662 MH |
423 | int err; |
424 | ||
1da177e4 LT |
425 | p = hci_uart_get_proto(id); |
426 | if (!p) | |
427 | return -EPROTONOSUPPORT; | |
428 | ||
429 | err = p->open(hu); | |
430 | if (err) | |
431 | return err; | |
432 | ||
433 | hu->proto = p; | |
434 | ||
435 | err = hci_uart_register_dev(hu); | |
436 | if (err) { | |
437 | p->close(hu); | |
438 | return err; | |
439 | } | |
0372a662 | 440 | |
1da177e4 LT |
441 | return 0; |
442 | } | |
443 | ||
444 | /* hci_uart_tty_ioctl() | |
445 | * | |
446 | * Process IOCTL system call for the tty device. | |
447 | * | |
448 | * Arguments: | |
449 | * | |
450 | * tty pointer to tty instance data | |
451 | * file pointer to open file object for device | |
452 | * cmd IOCTL command code | |
453 | * arg argument for IOCTL call (cmd dependent) | |
454 | * | |
455 | * Return Value: Command dependent | |
456 | */ | |
457 | static int hci_uart_tty_ioctl(struct tty_struct *tty, struct file * file, | |
0372a662 | 458 | unsigned int cmd, unsigned long arg) |
1da177e4 LT |
459 | { |
460 | struct hci_uart *hu = (void *)tty->disc_data; | |
461 | int err = 0; | |
462 | ||
463 | BT_DBG(""); | |
464 | ||
465 | /* Verify the status of the device */ | |
466 | if (!hu) | |
467 | return -EBADF; | |
468 | ||
469 | switch (cmd) { | |
470 | case HCIUARTSETPROTO: | |
471 | if (!test_and_set_bit(HCI_UART_PROTO_SET, &hu->flags)) { | |
472 | err = hci_uart_set_proto(hu, arg); | |
473 | if (err) { | |
474 | clear_bit(HCI_UART_PROTO_SET, &hu->flags); | |
475 | return err; | |
476 | } | |
477 | tty->low_latency = 1; | |
0372a662 | 478 | } else |
1da177e4 LT |
479 | return -EBUSY; |
480 | ||
481 | case HCIUARTGETPROTO: | |
482 | if (test_bit(HCI_UART_PROTO_SET, &hu->flags)) | |
483 | return hu->proto->id; | |
484 | return -EUNATCH; | |
0372a662 | 485 | |
1da177e4 LT |
486 | default: |
487 | err = n_tty_ioctl(tty, file, cmd, arg); | |
488 | break; | |
489 | }; | |
490 | ||
491 | return err; | |
492 | } | |
493 | ||
494 | /* | |
495 | * We don't provide read/write/poll interface for user space. | |
496 | */ | |
0372a662 MH |
497 | static ssize_t hci_uart_tty_read(struct tty_struct *tty, struct file *file, |
498 | unsigned char __user *buf, size_t nr) | |
1da177e4 LT |
499 | { |
500 | return 0; | |
501 | } | |
0372a662 MH |
502 | |
503 | static ssize_t hci_uart_tty_write(struct tty_struct *tty, struct file *file, | |
504 | const unsigned char *data, size_t count) | |
1da177e4 LT |
505 | { |
506 | return 0; | |
507 | } | |
0372a662 MH |
508 | |
509 | static unsigned int hci_uart_tty_poll(struct tty_struct *tty, | |
510 | struct file *filp, poll_table *wait) | |
1da177e4 LT |
511 | { |
512 | return 0; | |
513 | } | |
514 | ||
1da177e4 LT |
515 | static int __init hci_uart_init(void) |
516 | { | |
517 | static struct tty_ldisc hci_uart_ldisc; | |
518 | int err; | |
519 | ||
520 | BT_INFO("HCI UART driver ver %s", VERSION); | |
521 | ||
522 | /* Register the tty discipline */ | |
523 | ||
524 | memset(&hci_uart_ldisc, 0, sizeof (hci_uart_ldisc)); | |
0372a662 MH |
525 | hci_uart_ldisc.magic = TTY_LDISC_MAGIC; |
526 | hci_uart_ldisc.name = "n_hci"; | |
527 | hci_uart_ldisc.open = hci_uart_tty_open; | |
528 | hci_uart_ldisc.close = hci_uart_tty_close; | |
529 | hci_uart_ldisc.read = hci_uart_tty_read; | |
530 | hci_uart_ldisc.write = hci_uart_tty_write; | |
531 | hci_uart_ldisc.ioctl = hci_uart_tty_ioctl; | |
532 | hci_uart_ldisc.poll = hci_uart_tty_poll; | |
0372a662 MH |
533 | hci_uart_ldisc.receive_buf = hci_uart_tty_receive; |
534 | hci_uart_ldisc.write_wakeup = hci_uart_tty_wakeup; | |
535 | hci_uart_ldisc.owner = THIS_MODULE; | |
1da177e4 LT |
536 | |
537 | if ((err = tty_register_ldisc(N_HCI, &hci_uart_ldisc))) { | |
538 | BT_ERR("HCI line discipline registration failed. (%d)", err); | |
539 | return err; | |
540 | } | |
541 | ||
542 | #ifdef CONFIG_BT_HCIUART_H4 | |
543 | h4_init(); | |
544 | #endif | |
545 | #ifdef CONFIG_BT_HCIUART_BCSP | |
546 | bcsp_init(); | |
547 | #endif | |
548 | ||
549 | return 0; | |
550 | } | |
551 | ||
552 | static void __exit hci_uart_exit(void) | |
553 | { | |
554 | int err; | |
555 | ||
556 | #ifdef CONFIG_BT_HCIUART_H4 | |
557 | h4_deinit(); | |
558 | #endif | |
559 | #ifdef CONFIG_BT_HCIUART_BCSP | |
560 | bcsp_deinit(); | |
561 | #endif | |
562 | ||
563 | /* Release tty registration of line discipline */ | |
64ccd715 | 564 | if ((err = tty_unregister_ldisc(N_HCI))) |
1da177e4 LT |
565 | BT_ERR("Can't unregister HCI line discipline (%d)", err); |
566 | } | |
567 | ||
568 | module_init(hci_uart_init); | |
569 | module_exit(hci_uart_exit); | |
570 | ||
571 | module_param(reset, bool, 0644); | |
572 | MODULE_PARM_DESC(reset, "Send HCI reset command on initialization"); | |
573 | ||
574 | MODULE_AUTHOR("Maxim Krasnyansky <maxk@qualcomm.com>, Marcel Holtmann <marcel@holtmann.org>"); | |
575 | MODULE_DESCRIPTION("Bluetooth HCI UART driver ver " VERSION); | |
576 | MODULE_VERSION(VERSION); | |
577 | MODULE_LICENSE("GPL"); | |
578 | MODULE_ALIAS_LDISC(N_HCI); |