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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 | 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> | |
43 | ||
44 | #include <net/bluetooth/bluetooth.h> | |
45 | #include <net/bluetooth/hci_core.h> | |
46 | ||
47 | #include "hci_uart.h" | |
48 | ||
49 | #ifndef CONFIG_BT_HCIUART_DEBUG | |
50 | #undef BT_DBG | |
51 | #define BT_DBG( A... ) | |
1da177e4 LT |
52 | #endif |
53 | ||
0372a662 MH |
54 | #define VERSION "2.2" |
55 | ||
1da177e4 LT |
56 | static int reset = 0; |
57 | ||
58 | static struct hci_uart_proto *hup[HCI_UART_MAX_PROTO]; | |
59 | ||
60 | int hci_uart_register_proto(struct hci_uart_proto *p) | |
61 | { | |
62 | if (p->id >= HCI_UART_MAX_PROTO) | |
63 | return -EINVAL; | |
64 | ||
65 | if (hup[p->id]) | |
66 | return -EEXIST; | |
67 | ||
68 | hup[p->id] = p; | |
0372a662 | 69 | |
1da177e4 LT |
70 | return 0; |
71 | } | |
72 | ||
73 | int hci_uart_unregister_proto(struct hci_uart_proto *p) | |
74 | { | |
75 | if (p->id >= HCI_UART_MAX_PROTO) | |
76 | return -EINVAL; | |
77 | ||
78 | if (!hup[p->id]) | |
79 | return -EINVAL; | |
80 | ||
81 | hup[p->id] = NULL; | |
0372a662 | 82 | |
1da177e4 LT |
83 | return 0; |
84 | } | |
85 | ||
86 | static struct hci_uart_proto *hci_uart_get_proto(unsigned int id) | |
87 | { | |
88 | if (id >= HCI_UART_MAX_PROTO) | |
89 | return NULL; | |
0372a662 | 90 | |
1da177e4 LT |
91 | return hup[id]; |
92 | } | |
93 | ||
94 | static inline void hci_uart_tx_complete(struct hci_uart *hu, int pkt_type) | |
95 | { | |
96 | struct hci_dev *hdev = hu->hdev; | |
0372a662 | 97 | |
1da177e4 LT |
98 | /* Update HCI stat counters */ |
99 | switch (pkt_type) { | |
100 | case HCI_COMMAND_PKT: | |
101 | hdev->stat.cmd_tx++; | |
102 | break; | |
103 | ||
104 | case HCI_ACLDATA_PKT: | |
105 | hdev->stat.acl_tx++; | |
106 | break; | |
107 | ||
108 | case HCI_SCODATA_PKT: | |
109 | hdev->stat.cmd_tx++; | |
110 | break; | |
111 | } | |
112 | } | |
113 | ||
114 | static inline struct sk_buff *hci_uart_dequeue(struct hci_uart *hu) | |
115 | { | |
116 | struct sk_buff *skb = hu->tx_skb; | |
0372a662 | 117 | |
1da177e4 LT |
118 | if (!skb) |
119 | skb = hu->proto->dequeue(hu); | |
120 | else | |
121 | hu->tx_skb = NULL; | |
0372a662 | 122 | |
1da177e4 LT |
123 | return skb; |
124 | } | |
125 | ||
126 | int hci_uart_tx_wakeup(struct hci_uart *hu) | |
127 | { | |
128 | struct tty_struct *tty = hu->tty; | |
129 | struct hci_dev *hdev = hu->hdev; | |
130 | struct sk_buff *skb; | |
0372a662 | 131 | |
1da177e4 LT |
132 | if (test_and_set_bit(HCI_UART_SENDING, &hu->tx_state)) { |
133 | set_bit(HCI_UART_TX_WAKEUP, &hu->tx_state); | |
134 | return 0; | |
135 | } | |
136 | ||
137 | BT_DBG(""); | |
138 | ||
139 | restart: | |
140 | clear_bit(HCI_UART_TX_WAKEUP, &hu->tx_state); | |
141 | ||
142 | while ((skb = hci_uart_dequeue(hu))) { | |
143 | int len; | |
0372a662 | 144 | |
1da177e4 LT |
145 | set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); |
146 | len = tty->driver->write(tty, skb->data, skb->len); | |
147 | hdev->stat.byte_tx += len; | |
148 | ||
149 | skb_pull(skb, len); | |
150 | if (skb->len) { | |
151 | hu->tx_skb = skb; | |
152 | break; | |
153 | } | |
0372a662 | 154 | |
0d48d939 | 155 | hci_uart_tx_complete(hu, bt_cb(skb)->pkt_type); |
1da177e4 | 156 | kfree_skb(skb); |
0372a662 MH |
157 | } |
158 | ||
1da177e4 LT |
159 | if (test_bit(HCI_UART_TX_WAKEUP, &hu->tx_state)) |
160 | goto restart; | |
161 | ||
162 | clear_bit(HCI_UART_SENDING, &hu->tx_state); | |
163 | return 0; | |
164 | } | |
165 | ||
166 | /* ------- Interface to HCI layer ------ */ | |
167 | /* Initialize device */ | |
168 | static int hci_uart_open(struct hci_dev *hdev) | |
169 | { | |
170 | BT_DBG("%s %p", hdev->name, hdev); | |
171 | ||
172 | /* Nothing to do for UART driver */ | |
173 | ||
174 | set_bit(HCI_RUNNING, &hdev->flags); | |
0372a662 | 175 | |
1da177e4 LT |
176 | return 0; |
177 | } | |
178 | ||
179 | /* Reset device */ | |
180 | static int hci_uart_flush(struct hci_dev *hdev) | |
181 | { | |
182 | struct hci_uart *hu = (struct hci_uart *) hdev->driver_data; | |
183 | struct tty_struct *tty = hu->tty; | |
184 | ||
185 | BT_DBG("hdev %p tty %p", hdev, tty); | |
186 | ||
187 | if (hu->tx_skb) { | |
188 | kfree_skb(hu->tx_skb); hu->tx_skb = NULL; | |
189 | } | |
190 | ||
191 | /* Flush any pending characters in the driver and discipline. */ | |
192 | tty_ldisc_flush(tty); | |
420cc350 | 193 | if (tty->driver && tty->driver->flush_buffer) |
1da177e4 LT |
194 | tty->driver->flush_buffer(tty); |
195 | ||
196 | if (test_bit(HCI_UART_PROTO_SET, &hu->flags)) | |
197 | hu->proto->flush(hu); | |
198 | ||
199 | return 0; | |
200 | } | |
201 | ||
202 | /* Close device */ | |
203 | static int hci_uart_close(struct hci_dev *hdev) | |
204 | { | |
205 | BT_DBG("hdev %p", hdev); | |
206 | ||
207 | if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags)) | |
208 | return 0; | |
209 | ||
210 | hci_uart_flush(hdev); | |
211 | return 0; | |
212 | } | |
213 | ||
214 | /* Send frames from HCI layer */ | |
215 | static int hci_uart_send_frame(struct sk_buff *skb) | |
216 | { | |
217 | struct hci_dev* hdev = (struct hci_dev *) skb->dev; | |
218 | struct tty_struct *tty; | |
219 | struct hci_uart *hu; | |
220 | ||
221 | if (!hdev) { | |
222 | BT_ERR("Frame for uknown device (hdev=NULL)"); | |
223 | return -ENODEV; | |
224 | } | |
225 | ||
226 | if (!test_bit(HCI_RUNNING, &hdev->flags)) | |
227 | return -EBUSY; | |
228 | ||
229 | hu = (struct hci_uart *) hdev->driver_data; | |
230 | tty = hu->tty; | |
231 | ||
0d48d939 | 232 | BT_DBG("%s: type %d len %d", hdev->name, bt_cb(skb)->pkt_type, skb->len); |
1da177e4 LT |
233 | |
234 | hu->proto->enqueue(hu, skb); | |
235 | ||
236 | hci_uart_tx_wakeup(hu); | |
0372a662 | 237 | |
1da177e4 LT |
238 | return 0; |
239 | } | |
240 | ||
241 | static void hci_uart_destruct(struct hci_dev *hdev) | |
242 | { | |
0372a662 MH |
243 | if (!hdev) |
244 | return; | |
1da177e4 LT |
245 | |
246 | BT_DBG("%s", hdev->name); | |
7785162c | 247 | kfree(hdev->driver_data); |
1da177e4 LT |
248 | } |
249 | ||
250 | /* ------ LDISC part ------ */ | |
251 | /* hci_uart_tty_open | |
252 | * | |
253 | * Called when line discipline changed to HCI_UART. | |
254 | * | |
255 | * Arguments: | |
256 | * tty pointer to tty info structure | |
257 | * Return Value: | |
258 | * 0 if success, otherwise error code | |
259 | */ | |
260 | static int hci_uart_tty_open(struct tty_struct *tty) | |
261 | { | |
262 | struct hci_uart *hu = (void *) tty->disc_data; | |
263 | ||
264 | BT_DBG("tty %p", tty); | |
265 | ||
266 | if (hu) | |
267 | return -EEXIST; | |
268 | ||
089b1dbb | 269 | if (!(hu = kzalloc(sizeof(struct hci_uart), GFP_KERNEL))) { |
7785162c | 270 | BT_ERR("Can't allocate control structure"); |
1da177e4 LT |
271 | return -ENFILE; |
272 | } | |
0372a662 | 273 | |
1da177e4 LT |
274 | tty->disc_data = hu; |
275 | hu->tty = tty; | |
33f0f88f | 276 | tty->receive_room = 65536; |
1da177e4 LT |
277 | |
278 | spin_lock_init(&hu->rx_lock); | |
279 | ||
280 | /* Flush any pending characters in the driver and line discipline. */ | |
0372a662 | 281 | |
1da177e4 LT |
282 | /* FIXME: why is this needed. Note don't use ldisc_ref here as the |
283 | open path is before the ldisc is referencable */ | |
0372a662 | 284 | |
1da177e4 LT |
285 | if (tty->ldisc.flush_buffer) |
286 | tty->ldisc.flush_buffer(tty); | |
287 | ||
420cc350 | 288 | if (tty->driver && tty->driver->flush_buffer) |
1da177e4 LT |
289 | tty->driver->flush_buffer(tty); |
290 | ||
291 | return 0; | |
292 | } | |
293 | ||
294 | /* hci_uart_tty_close() | |
295 | * | |
296 | * Called when the line discipline is changed to something | |
297 | * else, the tty is closed, or the tty detects a hangup. | |
298 | */ | |
299 | static void hci_uart_tty_close(struct tty_struct *tty) | |
300 | { | |
301 | struct hci_uart *hu = (void *)tty->disc_data; | |
302 | ||
303 | BT_DBG("tty %p", tty); | |
304 | ||
305 | /* Detach from the tty */ | |
306 | tty->disc_data = NULL; | |
307 | ||
308 | if (hu) { | |
309 | struct hci_dev *hdev = hu->hdev; | |
22ad4203 MH |
310 | |
311 | if (hdev) | |
312 | hci_uart_close(hdev); | |
1da177e4 LT |
313 | |
314 | if (test_and_clear_bit(HCI_UART_PROTO_SET, &hu->flags)) { | |
315 | hu->proto->close(hu); | |
316 | hci_unregister_dev(hdev); | |
317 | hci_free_dev(hdev); | |
318 | } | |
319 | } | |
320 | } | |
321 | ||
322 | /* hci_uart_tty_wakeup() | |
323 | * | |
324 | * Callback for transmit wakeup. Called when low level | |
325 | * device driver can accept more send data. | |
326 | * | |
327 | * Arguments: tty pointer to associated tty instance data | |
328 | * Return Value: None | |
329 | */ | |
330 | static void hci_uart_tty_wakeup(struct tty_struct *tty) | |
331 | { | |
332 | struct hci_uart *hu = (void *)tty->disc_data; | |
333 | ||
334 | BT_DBG(""); | |
335 | ||
336 | if (!hu) | |
337 | return; | |
338 | ||
339 | clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); | |
340 | ||
341 | if (tty != hu->tty) | |
342 | return; | |
343 | ||
344 | if (test_bit(HCI_UART_PROTO_SET, &hu->flags)) | |
345 | hci_uart_tx_wakeup(hu); | |
346 | } | |
347 | ||
1da177e4 LT |
348 | /* hci_uart_tty_receive() |
349 | * | |
350 | * Called by tty low level driver when receive data is | |
351 | * available. | |
352 | * | |
353 | * Arguments: tty pointer to tty isntance data | |
354 | * data pointer to received data | |
355 | * flags pointer to flags for data | |
356 | * count count of received data in bytes | |
357 | * | |
358 | * Return Value: None | |
359 | */ | |
7785162c | 360 | static void hci_uart_tty_receive(struct tty_struct *tty, const u8 *data, char *flags, int count) |
1da177e4 LT |
361 | { |
362 | struct hci_uart *hu = (void *)tty->disc_data; | |
0372a662 | 363 | |
1da177e4 LT |
364 | if (!hu || tty != hu->tty) |
365 | return; | |
366 | ||
367 | if (!test_bit(HCI_UART_PROTO_SET, &hu->flags)) | |
368 | return; | |
0372a662 | 369 | |
1da177e4 LT |
370 | spin_lock(&hu->rx_lock); |
371 | hu->proto->recv(hu, (void *) data, count); | |
372 | hu->hdev->stat.byte_rx += count; | |
373 | spin_unlock(&hu->rx_lock); | |
374 | ||
7785162c MH |
375 | if (test_and_clear_bit(TTY_THROTTLED, &tty->flags) && |
376 | tty->driver->unthrottle) | |
1da177e4 LT |
377 | tty->driver->unthrottle(tty); |
378 | } | |
379 | ||
380 | static int hci_uart_register_dev(struct hci_uart *hu) | |
381 | { | |
382 | struct hci_dev *hdev; | |
383 | ||
384 | BT_DBG(""); | |
385 | ||
386 | /* Initialize and register HCI device */ | |
387 | hdev = hci_alloc_dev(); | |
388 | if (!hdev) { | |
389 | BT_ERR("Can't allocate HCI device"); | |
390 | return -ENOMEM; | |
391 | } | |
392 | ||
393 | hu->hdev = hdev; | |
394 | ||
395 | hdev->type = HCI_UART; | |
396 | hdev->driver_data = hu; | |
397 | ||
398 | hdev->open = hci_uart_open; | |
399 | hdev->close = hci_uart_close; | |
400 | hdev->flush = hci_uart_flush; | |
401 | hdev->send = hci_uart_send_frame; | |
402 | hdev->destruct = hci_uart_destruct; | |
403 | ||
404 | hdev->owner = THIS_MODULE; | |
405 | ||
406 | if (reset) | |
407 | set_bit(HCI_QUIRK_RESET_ON_INIT, &hdev->quirks); | |
408 | ||
409 | if (hci_register_dev(hdev) < 0) { | |
410 | BT_ERR("Can't register HCI device"); | |
411 | hci_free_dev(hdev); | |
412 | return -ENODEV; | |
413 | } | |
414 | ||
415 | return 0; | |
416 | } | |
417 | ||
418 | static int hci_uart_set_proto(struct hci_uart *hu, int id) | |
419 | { | |
420 | struct hci_uart_proto *p; | |
0372a662 MH |
421 | int err; |
422 | ||
1da177e4 LT |
423 | p = hci_uart_get_proto(id); |
424 | if (!p) | |
425 | return -EPROTONOSUPPORT; | |
426 | ||
427 | err = p->open(hu); | |
428 | if (err) | |
429 | return err; | |
430 | ||
431 | hu->proto = p; | |
432 | ||
433 | err = hci_uart_register_dev(hu); | |
434 | if (err) { | |
435 | p->close(hu); | |
436 | return err; | |
437 | } | |
0372a662 | 438 | |
1da177e4 LT |
439 | return 0; |
440 | } | |
441 | ||
442 | /* hci_uart_tty_ioctl() | |
443 | * | |
444 | * Process IOCTL system call for the tty device. | |
445 | * | |
446 | * Arguments: | |
447 | * | |
448 | * tty pointer to tty instance data | |
449 | * file pointer to open file object for device | |
450 | * cmd IOCTL command code | |
451 | * arg argument for IOCTL call (cmd dependent) | |
452 | * | |
453 | * Return Value: Command dependent | |
454 | */ | |
455 | static int hci_uart_tty_ioctl(struct tty_struct *tty, struct file * file, | |
0372a662 | 456 | unsigned int cmd, unsigned long arg) |
1da177e4 LT |
457 | { |
458 | struct hci_uart *hu = (void *)tty->disc_data; | |
459 | int err = 0; | |
460 | ||
461 | BT_DBG(""); | |
462 | ||
463 | /* Verify the status of the device */ | |
464 | if (!hu) | |
465 | return -EBADF; | |
466 | ||
467 | switch (cmd) { | |
468 | case HCIUARTSETPROTO: | |
469 | if (!test_and_set_bit(HCI_UART_PROTO_SET, &hu->flags)) { | |
470 | err = hci_uart_set_proto(hu, arg); | |
471 | if (err) { | |
472 | clear_bit(HCI_UART_PROTO_SET, &hu->flags); | |
473 | return err; | |
474 | } | |
475 | tty->low_latency = 1; | |
0372a662 | 476 | } else |
1da177e4 | 477 | return -EBUSY; |
c33be3c3 | 478 | break; |
1da177e4 LT |
479 | |
480 | case HCIUARTGETPROTO: | |
481 | if (test_bit(HCI_UART_PROTO_SET, &hu->flags)) | |
482 | return hu->proto->id; | |
483 | return -EUNATCH; | |
0372a662 | 484 | |
d2158744 MH |
485 | case HCIUARTGETDEVICE: |
486 | if (test_bit(HCI_UART_PROTO_SET, &hu->flags)) | |
487 | return hu->hdev->id; | |
488 | return -EUNATCH; | |
489 | ||
1da177e4 LT |
490 | default: |
491 | err = n_tty_ioctl(tty, file, cmd, arg); | |
492 | break; | |
493 | }; | |
494 | ||
495 | return err; | |
496 | } | |
497 | ||
498 | /* | |
499 | * We don't provide read/write/poll interface for user space. | |
500 | */ | |
0372a662 MH |
501 | static ssize_t hci_uart_tty_read(struct tty_struct *tty, struct file *file, |
502 | unsigned char __user *buf, size_t nr) | |
1da177e4 LT |
503 | { |
504 | return 0; | |
505 | } | |
0372a662 MH |
506 | |
507 | static ssize_t hci_uart_tty_write(struct tty_struct *tty, struct file *file, | |
508 | const unsigned char *data, size_t count) | |
1da177e4 LT |
509 | { |
510 | return 0; | |
511 | } | |
0372a662 MH |
512 | |
513 | static unsigned int hci_uart_tty_poll(struct tty_struct *tty, | |
514 | struct file *filp, poll_table *wait) | |
1da177e4 LT |
515 | { |
516 | return 0; | |
517 | } | |
518 | ||
1da177e4 LT |
519 | static int __init hci_uart_init(void) |
520 | { | |
521 | static struct tty_ldisc hci_uart_ldisc; | |
522 | int err; | |
523 | ||
524 | BT_INFO("HCI UART driver ver %s", VERSION); | |
525 | ||
526 | /* Register the tty discipline */ | |
527 | ||
528 | memset(&hci_uart_ldisc, 0, sizeof (hci_uart_ldisc)); | |
0372a662 MH |
529 | hci_uart_ldisc.magic = TTY_LDISC_MAGIC; |
530 | hci_uart_ldisc.name = "n_hci"; | |
531 | hci_uart_ldisc.open = hci_uart_tty_open; | |
532 | hci_uart_ldisc.close = hci_uart_tty_close; | |
533 | hci_uart_ldisc.read = hci_uart_tty_read; | |
534 | hci_uart_ldisc.write = hci_uart_tty_write; | |
535 | hci_uart_ldisc.ioctl = hci_uart_tty_ioctl; | |
536 | hci_uart_ldisc.poll = hci_uart_tty_poll; | |
0372a662 MH |
537 | hci_uart_ldisc.receive_buf = hci_uart_tty_receive; |
538 | hci_uart_ldisc.write_wakeup = hci_uart_tty_wakeup; | |
539 | hci_uart_ldisc.owner = THIS_MODULE; | |
1da177e4 LT |
540 | |
541 | if ((err = tty_register_ldisc(N_HCI, &hci_uart_ldisc))) { | |
542 | BT_ERR("HCI line discipline registration failed. (%d)", err); | |
543 | return err; | |
544 | } | |
545 | ||
546 | #ifdef CONFIG_BT_HCIUART_H4 | |
547 | h4_init(); | |
548 | #endif | |
549 | #ifdef CONFIG_BT_HCIUART_BCSP | |
550 | bcsp_init(); | |
551 | #endif | |
552 | ||
553 | return 0; | |
554 | } | |
555 | ||
556 | static void __exit hci_uart_exit(void) | |
557 | { | |
558 | int err; | |
559 | ||
560 | #ifdef CONFIG_BT_HCIUART_H4 | |
561 | h4_deinit(); | |
562 | #endif | |
563 | #ifdef CONFIG_BT_HCIUART_BCSP | |
564 | bcsp_deinit(); | |
565 | #endif | |
566 | ||
567 | /* Release tty registration of line discipline */ | |
64ccd715 | 568 | if ((err = tty_unregister_ldisc(N_HCI))) |
1da177e4 LT |
569 | BT_ERR("Can't unregister HCI line discipline (%d)", err); |
570 | } | |
571 | ||
572 | module_init(hci_uart_init); | |
573 | module_exit(hci_uart_exit); | |
574 | ||
575 | module_param(reset, bool, 0644); | |
576 | MODULE_PARM_DESC(reset, "Send HCI reset command on initialization"); | |
577 | ||
578 | MODULE_AUTHOR("Maxim Krasnyansky <maxk@qualcomm.com>, Marcel Holtmann <marcel@holtmann.org>"); | |
579 | MODULE_DESCRIPTION("Bluetooth HCI UART driver ver " VERSION); | |
580 | MODULE_VERSION(VERSION); | |
581 | MODULE_LICENSE("GPL"); | |
582 | MODULE_ALIAS_LDISC(N_HCI); |