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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 LT |
25 | |
26 | #include <linux/config.h> | |
27 | #include <linux/module.h> | |
28 | ||
29 | #include <linux/kernel.h> | |
30 | #include <linux/init.h> | |
31 | #include <linux/sched.h> | |
32 | #include <linux/types.h> | |
33 | #include <linux/fcntl.h> | |
34 | #include <linux/interrupt.h> | |
35 | #include <linux/ptrace.h> | |
36 | #include <linux/poll.h> | |
37 | ||
38 | #include <linux/slab.h> | |
39 | #include <linux/tty.h> | |
40 | #include <linux/errno.h> | |
41 | #include <linux/string.h> | |
42 | #include <linux/signal.h> | |
43 | #include <linux/ioctl.h> | |
44 | #include <linux/skbuff.h> | |
45 | ||
46 | #include <net/bluetooth/bluetooth.h> | |
47 | #include <net/bluetooth/hci_core.h> | |
48 | ||
49 | #include "hci_uart.h" | |
50 | ||
51 | #ifndef CONFIG_BT_HCIUART_DEBUG | |
52 | #undef BT_DBG | |
53 | #define BT_DBG( A... ) | |
1da177e4 LT |
54 | #endif |
55 | ||
0372a662 MH |
56 | #define VERSION "2.2" |
57 | ||
1da177e4 LT |
58 | static int reset = 0; |
59 | ||
60 | static struct hci_uart_proto *hup[HCI_UART_MAX_PROTO]; | |
61 | ||
62 | int hci_uart_register_proto(struct hci_uart_proto *p) | |
63 | { | |
64 | if (p->id >= HCI_UART_MAX_PROTO) | |
65 | return -EINVAL; | |
66 | ||
67 | if (hup[p->id]) | |
68 | return -EEXIST; | |
69 | ||
70 | hup[p->id] = p; | |
0372a662 | 71 | |
1da177e4 LT |
72 | return 0; |
73 | } | |
74 | ||
75 | int hci_uart_unregister_proto(struct hci_uart_proto *p) | |
76 | { | |
77 | if (p->id >= HCI_UART_MAX_PROTO) | |
78 | return -EINVAL; | |
79 | ||
80 | if (!hup[p->id]) | |
81 | return -EINVAL; | |
82 | ||
83 | hup[p->id] = NULL; | |
0372a662 | 84 | |
1da177e4 LT |
85 | return 0; |
86 | } | |
87 | ||
88 | static struct hci_uart_proto *hci_uart_get_proto(unsigned int id) | |
89 | { | |
90 | if (id >= HCI_UART_MAX_PROTO) | |
91 | return NULL; | |
0372a662 | 92 | |
1da177e4 LT |
93 | return hup[id]; |
94 | } | |
95 | ||
96 | static inline void hci_uart_tx_complete(struct hci_uart *hu, int pkt_type) | |
97 | { | |
98 | struct hci_dev *hdev = hu->hdev; | |
0372a662 | 99 | |
1da177e4 LT |
100 | /* Update HCI stat counters */ |
101 | switch (pkt_type) { | |
102 | case HCI_COMMAND_PKT: | |
103 | hdev->stat.cmd_tx++; | |
104 | break; | |
105 | ||
106 | case HCI_ACLDATA_PKT: | |
107 | hdev->stat.acl_tx++; | |
108 | break; | |
109 | ||
110 | case HCI_SCODATA_PKT: | |
111 | hdev->stat.cmd_tx++; | |
112 | break; | |
113 | } | |
114 | } | |
115 | ||
116 | static inline struct sk_buff *hci_uart_dequeue(struct hci_uart *hu) | |
117 | { | |
118 | struct sk_buff *skb = hu->tx_skb; | |
0372a662 | 119 | |
1da177e4 LT |
120 | if (!skb) |
121 | skb = hu->proto->dequeue(hu); | |
122 | else | |
123 | hu->tx_skb = NULL; | |
0372a662 | 124 | |
1da177e4 LT |
125 | return skb; |
126 | } | |
127 | ||
128 | int hci_uart_tx_wakeup(struct hci_uart *hu) | |
129 | { | |
130 | struct tty_struct *tty = hu->tty; | |
131 | struct hci_dev *hdev = hu->hdev; | |
132 | struct sk_buff *skb; | |
0372a662 | 133 | |
1da177e4 LT |
134 | if (test_and_set_bit(HCI_UART_SENDING, &hu->tx_state)) { |
135 | set_bit(HCI_UART_TX_WAKEUP, &hu->tx_state); | |
136 | return 0; | |
137 | } | |
138 | ||
139 | BT_DBG(""); | |
140 | ||
141 | restart: | |
142 | clear_bit(HCI_UART_TX_WAKEUP, &hu->tx_state); | |
143 | ||
144 | while ((skb = hci_uart_dequeue(hu))) { | |
145 | int len; | |
0372a662 | 146 | |
1da177e4 LT |
147 | set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); |
148 | len = tty->driver->write(tty, skb->data, skb->len); | |
149 | hdev->stat.byte_tx += len; | |
150 | ||
151 | skb_pull(skb, len); | |
152 | if (skb->len) { | |
153 | hu->tx_skb = skb; | |
154 | break; | |
155 | } | |
0372a662 | 156 | |
0d48d939 | 157 | hci_uart_tx_complete(hu, bt_cb(skb)->pkt_type); |
1da177e4 | 158 | kfree_skb(skb); |
0372a662 MH |
159 | } |
160 | ||
1da177e4 LT |
161 | if (test_bit(HCI_UART_TX_WAKEUP, &hu->tx_state)) |
162 | goto restart; | |
163 | ||
164 | clear_bit(HCI_UART_SENDING, &hu->tx_state); | |
165 | return 0; | |
166 | } | |
167 | ||
168 | /* ------- Interface to HCI layer ------ */ | |
169 | /* Initialize device */ | |
170 | static int hci_uart_open(struct hci_dev *hdev) | |
171 | { | |
172 | BT_DBG("%s %p", hdev->name, hdev); | |
173 | ||
174 | /* Nothing to do for UART driver */ | |
175 | ||
176 | set_bit(HCI_RUNNING, &hdev->flags); | |
0372a662 | 177 | |
1da177e4 LT |
178 | return 0; |
179 | } | |
180 | ||
181 | /* Reset device */ | |
182 | static int hci_uart_flush(struct hci_dev *hdev) | |
183 | { | |
184 | struct hci_uart *hu = (struct hci_uart *) hdev->driver_data; | |
185 | struct tty_struct *tty = hu->tty; | |
186 | ||
187 | BT_DBG("hdev %p tty %p", hdev, tty); | |
188 | ||
189 | if (hu->tx_skb) { | |
190 | kfree_skb(hu->tx_skb); hu->tx_skb = NULL; | |
191 | } | |
192 | ||
193 | /* Flush any pending characters in the driver and discipline. */ | |
194 | tty_ldisc_flush(tty); | |
195 | if (tty->driver->flush_buffer) | |
196 | tty->driver->flush_buffer(tty); | |
197 | ||
198 | if (test_bit(HCI_UART_PROTO_SET, &hu->flags)) | |
199 | hu->proto->flush(hu); | |
200 | ||
201 | return 0; | |
202 | } | |
203 | ||
204 | /* Close device */ | |
205 | static int hci_uart_close(struct hci_dev *hdev) | |
206 | { | |
207 | BT_DBG("hdev %p", hdev); | |
208 | ||
209 | if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags)) | |
210 | return 0; | |
211 | ||
212 | hci_uart_flush(hdev); | |
213 | return 0; | |
214 | } | |
215 | ||
216 | /* Send frames from HCI layer */ | |
217 | static int hci_uart_send_frame(struct sk_buff *skb) | |
218 | { | |
219 | struct hci_dev* hdev = (struct hci_dev *) skb->dev; | |
220 | struct tty_struct *tty; | |
221 | struct hci_uart *hu; | |
222 | ||
223 | if (!hdev) { | |
224 | BT_ERR("Frame for uknown device (hdev=NULL)"); | |
225 | return -ENODEV; | |
226 | } | |
227 | ||
228 | if (!test_bit(HCI_RUNNING, &hdev->flags)) | |
229 | return -EBUSY; | |
230 | ||
231 | hu = (struct hci_uart *) hdev->driver_data; | |
232 | tty = hu->tty; | |
233 | ||
0d48d939 | 234 | BT_DBG("%s: type %d len %d", hdev->name, bt_cb(skb)->pkt_type, skb->len); |
1da177e4 LT |
235 | |
236 | hu->proto->enqueue(hu, skb); | |
237 | ||
238 | hci_uart_tx_wakeup(hu); | |
0372a662 | 239 | |
1da177e4 LT |
240 | return 0; |
241 | } | |
242 | ||
243 | static void hci_uart_destruct(struct hci_dev *hdev) | |
244 | { | |
245 | struct hci_uart *hu; | |
246 | ||
0372a662 MH |
247 | if (!hdev) |
248 | return; | |
1da177e4 LT |
249 | |
250 | BT_DBG("%s", hdev->name); | |
251 | ||
252 | hu = (struct hci_uart *) hdev->driver_data; | |
253 | kfree(hu); | |
254 | } | |
255 | ||
256 | /* ------ LDISC part ------ */ | |
257 | /* hci_uart_tty_open | |
258 | * | |
259 | * Called when line discipline changed to HCI_UART. | |
260 | * | |
261 | * Arguments: | |
262 | * tty pointer to tty info structure | |
263 | * Return Value: | |
264 | * 0 if success, otherwise error code | |
265 | */ | |
266 | static int hci_uart_tty_open(struct tty_struct *tty) | |
267 | { | |
268 | struct hci_uart *hu = (void *) tty->disc_data; | |
269 | ||
270 | BT_DBG("tty %p", tty); | |
271 | ||
272 | if (hu) | |
273 | return -EEXIST; | |
274 | ||
275 | if (!(hu = kmalloc(sizeof(struct hci_uart), GFP_KERNEL))) { | |
276 | BT_ERR("Can't allocate controll structure"); | |
277 | return -ENFILE; | |
278 | } | |
0372a662 | 279 | |
1da177e4 LT |
280 | memset(hu, 0, sizeof(struct hci_uart)); |
281 | ||
282 | tty->disc_data = hu; | |
283 | hu->tty = tty; | |
284 | ||
285 | spin_lock_init(&hu->rx_lock); | |
286 | ||
287 | /* Flush any pending characters in the driver and line discipline. */ | |
0372a662 | 288 | |
1da177e4 LT |
289 | /* FIXME: why is this needed. Note don't use ldisc_ref here as the |
290 | open path is before the ldisc is referencable */ | |
0372a662 | 291 | |
1da177e4 LT |
292 | if (tty->ldisc.flush_buffer) |
293 | tty->ldisc.flush_buffer(tty); | |
294 | ||
295 | if (tty->driver->flush_buffer) | |
296 | tty->driver->flush_buffer(tty); | |
297 | ||
298 | return 0; | |
299 | } | |
300 | ||
301 | /* hci_uart_tty_close() | |
302 | * | |
303 | * Called when the line discipline is changed to something | |
304 | * else, the tty is closed, or the tty detects a hangup. | |
305 | */ | |
306 | static void hci_uart_tty_close(struct tty_struct *tty) | |
307 | { | |
308 | struct hci_uart *hu = (void *)tty->disc_data; | |
309 | ||
310 | BT_DBG("tty %p", tty); | |
311 | ||
312 | /* Detach from the tty */ | |
313 | tty->disc_data = NULL; | |
314 | ||
315 | if (hu) { | |
316 | struct hci_dev *hdev = hu->hdev; | |
317 | hci_uart_close(hdev); | |
318 | ||
319 | if (test_and_clear_bit(HCI_UART_PROTO_SET, &hu->flags)) { | |
320 | hu->proto->close(hu); | |
321 | hci_unregister_dev(hdev); | |
322 | hci_free_dev(hdev); | |
323 | } | |
324 | } | |
325 | } | |
326 | ||
327 | /* hci_uart_tty_wakeup() | |
328 | * | |
329 | * Callback for transmit wakeup. Called when low level | |
330 | * device driver can accept more send data. | |
331 | * | |
332 | * Arguments: tty pointer to associated tty instance data | |
333 | * Return Value: None | |
334 | */ | |
335 | static void hci_uart_tty_wakeup(struct tty_struct *tty) | |
336 | { | |
337 | struct hci_uart *hu = (void *)tty->disc_data; | |
338 | ||
339 | BT_DBG(""); | |
340 | ||
341 | if (!hu) | |
342 | return; | |
343 | ||
344 | clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); | |
345 | ||
346 | if (tty != hu->tty) | |
347 | return; | |
348 | ||
349 | if (test_bit(HCI_UART_PROTO_SET, &hu->flags)) | |
350 | hci_uart_tx_wakeup(hu); | |
351 | } | |
352 | ||
353 | /* hci_uart_tty_room() | |
354 | * | |
355 | * Callback function from tty driver. Return the amount of | |
356 | * space left in the receiver's buffer to decide if remote | |
357 | * transmitter is to be throttled. | |
358 | * | |
359 | * Arguments: tty pointer to associated tty instance data | |
360 | * Return Value: number of bytes left in receive buffer | |
361 | */ | |
362 | static int hci_uart_tty_room (struct tty_struct *tty) | |
363 | { | |
364 | return 65536; | |
365 | } | |
366 | ||
367 | /* hci_uart_tty_receive() | |
368 | * | |
369 | * Called by tty low level driver when receive data is | |
370 | * available. | |
371 | * | |
372 | * Arguments: tty pointer to tty isntance data | |
373 | * data pointer to received data | |
374 | * flags pointer to flags for data | |
375 | * count count of received data in bytes | |
376 | * | |
377 | * Return Value: None | |
378 | */ | |
379 | static void hci_uart_tty_receive(struct tty_struct *tty, const __u8 *data, char *flags, int count) | |
380 | { | |
381 | struct hci_uart *hu = (void *)tty->disc_data; | |
0372a662 | 382 | |
1da177e4 LT |
383 | if (!hu || tty != hu->tty) |
384 | return; | |
385 | ||
386 | if (!test_bit(HCI_UART_PROTO_SET, &hu->flags)) | |
387 | return; | |
0372a662 | 388 | |
1da177e4 LT |
389 | spin_lock(&hu->rx_lock); |
390 | hu->proto->recv(hu, (void *) data, count); | |
391 | hu->hdev->stat.byte_rx += count; | |
392 | spin_unlock(&hu->rx_lock); | |
393 | ||
394 | if (test_and_clear_bit(TTY_THROTTLED,&tty->flags) && tty->driver->unthrottle) | |
395 | tty->driver->unthrottle(tty); | |
396 | } | |
397 | ||
398 | static int hci_uart_register_dev(struct hci_uart *hu) | |
399 | { | |
400 | struct hci_dev *hdev; | |
401 | ||
402 | BT_DBG(""); | |
403 | ||
404 | /* Initialize and register HCI device */ | |
405 | hdev = hci_alloc_dev(); | |
406 | if (!hdev) { | |
407 | BT_ERR("Can't allocate HCI device"); | |
408 | return -ENOMEM; | |
409 | } | |
410 | ||
411 | hu->hdev = hdev; | |
412 | ||
413 | hdev->type = HCI_UART; | |
414 | hdev->driver_data = hu; | |
415 | ||
416 | hdev->open = hci_uart_open; | |
417 | hdev->close = hci_uart_close; | |
418 | hdev->flush = hci_uart_flush; | |
419 | hdev->send = hci_uart_send_frame; | |
420 | hdev->destruct = hci_uart_destruct; | |
421 | ||
422 | hdev->owner = THIS_MODULE; | |
423 | ||
424 | if (reset) | |
425 | set_bit(HCI_QUIRK_RESET_ON_INIT, &hdev->quirks); | |
426 | ||
427 | if (hci_register_dev(hdev) < 0) { | |
428 | BT_ERR("Can't register HCI device"); | |
429 | hci_free_dev(hdev); | |
430 | return -ENODEV; | |
431 | } | |
432 | ||
433 | return 0; | |
434 | } | |
435 | ||
436 | static int hci_uart_set_proto(struct hci_uart *hu, int id) | |
437 | { | |
438 | struct hci_uart_proto *p; | |
0372a662 MH |
439 | int err; |
440 | ||
1da177e4 LT |
441 | p = hci_uart_get_proto(id); |
442 | if (!p) | |
443 | return -EPROTONOSUPPORT; | |
444 | ||
445 | err = p->open(hu); | |
446 | if (err) | |
447 | return err; | |
448 | ||
449 | hu->proto = p; | |
450 | ||
451 | err = hci_uart_register_dev(hu); | |
452 | if (err) { | |
453 | p->close(hu); | |
454 | return err; | |
455 | } | |
0372a662 | 456 | |
1da177e4 LT |
457 | return 0; |
458 | } | |
459 | ||
460 | /* hci_uart_tty_ioctl() | |
461 | * | |
462 | * Process IOCTL system call for the tty device. | |
463 | * | |
464 | * Arguments: | |
465 | * | |
466 | * tty pointer to tty instance data | |
467 | * file pointer to open file object for device | |
468 | * cmd IOCTL command code | |
469 | * arg argument for IOCTL call (cmd dependent) | |
470 | * | |
471 | * Return Value: Command dependent | |
472 | */ | |
473 | static int hci_uart_tty_ioctl(struct tty_struct *tty, struct file * file, | |
0372a662 | 474 | unsigned int cmd, unsigned long arg) |
1da177e4 LT |
475 | { |
476 | struct hci_uart *hu = (void *)tty->disc_data; | |
477 | int err = 0; | |
478 | ||
479 | BT_DBG(""); | |
480 | ||
481 | /* Verify the status of the device */ | |
482 | if (!hu) | |
483 | return -EBADF; | |
484 | ||
485 | switch (cmd) { | |
486 | case HCIUARTSETPROTO: | |
487 | if (!test_and_set_bit(HCI_UART_PROTO_SET, &hu->flags)) { | |
488 | err = hci_uart_set_proto(hu, arg); | |
489 | if (err) { | |
490 | clear_bit(HCI_UART_PROTO_SET, &hu->flags); | |
491 | return err; | |
492 | } | |
493 | tty->low_latency = 1; | |
0372a662 | 494 | } else |
1da177e4 LT |
495 | return -EBUSY; |
496 | ||
497 | case HCIUARTGETPROTO: | |
498 | if (test_bit(HCI_UART_PROTO_SET, &hu->flags)) | |
499 | return hu->proto->id; | |
500 | return -EUNATCH; | |
0372a662 | 501 | |
1da177e4 LT |
502 | default: |
503 | err = n_tty_ioctl(tty, file, cmd, arg); | |
504 | break; | |
505 | }; | |
506 | ||
507 | return err; | |
508 | } | |
509 | ||
510 | /* | |
511 | * We don't provide read/write/poll interface for user space. | |
512 | */ | |
0372a662 MH |
513 | static ssize_t hci_uart_tty_read(struct tty_struct *tty, struct file *file, |
514 | unsigned char __user *buf, size_t nr) | |
1da177e4 LT |
515 | { |
516 | return 0; | |
517 | } | |
0372a662 MH |
518 | |
519 | static ssize_t hci_uart_tty_write(struct tty_struct *tty, struct file *file, | |
520 | const unsigned char *data, size_t count) | |
1da177e4 LT |
521 | { |
522 | return 0; | |
523 | } | |
0372a662 MH |
524 | |
525 | static unsigned int hci_uart_tty_poll(struct tty_struct *tty, | |
526 | struct file *filp, poll_table *wait) | |
1da177e4 LT |
527 | { |
528 | return 0; | |
529 | } | |
530 | ||
1da177e4 LT |
531 | static int __init hci_uart_init(void) |
532 | { | |
533 | static struct tty_ldisc hci_uart_ldisc; | |
534 | int err; | |
535 | ||
536 | BT_INFO("HCI UART driver ver %s", VERSION); | |
537 | ||
538 | /* Register the tty discipline */ | |
539 | ||
540 | memset(&hci_uart_ldisc, 0, sizeof (hci_uart_ldisc)); | |
0372a662 MH |
541 | hci_uart_ldisc.magic = TTY_LDISC_MAGIC; |
542 | hci_uart_ldisc.name = "n_hci"; | |
543 | hci_uart_ldisc.open = hci_uart_tty_open; | |
544 | hci_uart_ldisc.close = hci_uart_tty_close; | |
545 | hci_uart_ldisc.read = hci_uart_tty_read; | |
546 | hci_uart_ldisc.write = hci_uart_tty_write; | |
547 | hci_uart_ldisc.ioctl = hci_uart_tty_ioctl; | |
548 | hci_uart_ldisc.poll = hci_uart_tty_poll; | |
549 | hci_uart_ldisc.receive_room = hci_uart_tty_room; | |
550 | hci_uart_ldisc.receive_buf = hci_uart_tty_receive; | |
551 | hci_uart_ldisc.write_wakeup = hci_uart_tty_wakeup; | |
552 | hci_uart_ldisc.owner = THIS_MODULE; | |
1da177e4 LT |
553 | |
554 | if ((err = tty_register_ldisc(N_HCI, &hci_uart_ldisc))) { | |
555 | BT_ERR("HCI line discipline registration failed. (%d)", err); | |
556 | return err; | |
557 | } | |
558 | ||
559 | #ifdef CONFIG_BT_HCIUART_H4 | |
560 | h4_init(); | |
561 | #endif | |
562 | #ifdef CONFIG_BT_HCIUART_BCSP | |
563 | bcsp_init(); | |
564 | #endif | |
565 | ||
566 | return 0; | |
567 | } | |
568 | ||
569 | static void __exit hci_uart_exit(void) | |
570 | { | |
571 | int err; | |
572 | ||
573 | #ifdef CONFIG_BT_HCIUART_H4 | |
574 | h4_deinit(); | |
575 | #endif | |
576 | #ifdef CONFIG_BT_HCIUART_BCSP | |
577 | bcsp_deinit(); | |
578 | #endif | |
579 | ||
580 | /* Release tty registration of line discipline */ | |
64ccd715 | 581 | if ((err = tty_unregister_ldisc(N_HCI))) |
1da177e4 LT |
582 | BT_ERR("Can't unregister HCI line discipline (%d)", err); |
583 | } | |
584 | ||
585 | module_init(hci_uart_init); | |
586 | module_exit(hci_uart_exit); | |
587 | ||
588 | module_param(reset, bool, 0644); | |
589 | MODULE_PARM_DESC(reset, "Send HCI reset command on initialization"); | |
590 | ||
591 | MODULE_AUTHOR("Maxim Krasnyansky <maxk@qualcomm.com>, Marcel Holtmann <marcel@holtmann.org>"); | |
592 | MODULE_DESCRIPTION("Bluetooth HCI UART driver ver " VERSION); | |
593 | MODULE_VERSION(VERSION); | |
594 | MODULE_LICENSE("GPL"); | |
595 | MODULE_ALIAS_LDISC(N_HCI); |