blob: 0f4203b499af65771ccb63bac79cae5ec2ad4f80 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 *
Marcel Holtmann0372a662005-10-28 19:20:45 +02003 * 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 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070024 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070025
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#include <linux/module.h>
27
28#include <linux/kernel.h>
29#include <linux/init.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#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... )
Linus Torvalds1da177e2005-04-16 15:20:36 -070052#endif
53
Marcel Holtmann0372a662005-10-28 19:20:45 +020054#define VERSION "2.2"
55
Linus Torvalds1da177e2005-04-16 15:20:36 -070056static int reset = 0;
57
58static struct hci_uart_proto *hup[HCI_UART_MAX_PROTO];
59
60int 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;
Marcel Holtmann0372a662005-10-28 19:20:45 +020069
Linus Torvalds1da177e2005-04-16 15:20:36 -070070 return 0;
71}
72
73int 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;
Marcel Holtmann0372a662005-10-28 19:20:45 +020082
Linus Torvalds1da177e2005-04-16 15:20:36 -070083 return 0;
84}
85
86static struct hci_uart_proto *hci_uart_get_proto(unsigned int id)
87{
88 if (id >= HCI_UART_MAX_PROTO)
89 return NULL;
Marcel Holtmann0372a662005-10-28 19:20:45 +020090
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 return hup[id];
92}
93
94static inline void hci_uart_tx_complete(struct hci_uart *hu, int pkt_type)
95{
96 struct hci_dev *hdev = hu->hdev;
Marcel Holtmann0372a662005-10-28 19:20:45 +020097
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 /* 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
114static inline struct sk_buff *hci_uart_dequeue(struct hci_uart *hu)
115{
116 struct sk_buff *skb = hu->tx_skb;
Marcel Holtmann0372a662005-10-28 19:20:45 +0200117
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 if (!skb)
119 skb = hu->proto->dequeue(hu);
120 else
121 hu->tx_skb = NULL;
Marcel Holtmann0372a662005-10-28 19:20:45 +0200122
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 return skb;
124}
125
126int 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;
Marcel Holtmann0372a662005-10-28 19:20:45 +0200131
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132 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
139restart:
140 clear_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
141
142 while ((skb = hci_uart_dequeue(hu))) {
143 int len;
Marcel Holtmann0372a662005-10-28 19:20:45 +0200144
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 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 }
Marcel Holtmann0372a662005-10-28 19:20:45 +0200154
Marcel Holtmann0d48d932005-08-09 20:30:28 -0700155 hci_uart_tx_complete(hu, bt_cb(skb)->pkt_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 kfree_skb(skb);
Marcel Holtmann0372a662005-10-28 19:20:45 +0200157 }
158
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 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 */
168static 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);
Marcel Holtmann0372a662005-10-28 19:20:45 +0200175
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176 return 0;
177}
178
179/* Reset device */
180static 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);
Marcel Holtmann420cc352006-07-06 15:53:31 +0200193 if (tty->driver && tty->driver->flush_buffer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 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 */
203static 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 */
215static 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
Marcel Holtmann0d48d932005-08-09 20:30:28 -0700232 BT_DBG("%s: type %d len %d", hdev->name, bt_cb(skb)->pkt_type, skb->len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233
234 hu->proto->enqueue(hu, skb);
235
236 hci_uart_tx_wakeup(hu);
Marcel Holtmann0372a662005-10-28 19:20:45 +0200237
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 return 0;
239}
240
241static void hci_uart_destruct(struct hci_dev *hdev)
242{
Marcel Holtmann0372a662005-10-28 19:20:45 +0200243 if (!hdev)
244 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245
246 BT_DBG("%s", hdev->name);
Marcel Holtmann77851622006-09-21 16:23:19 +0200247 kfree(hdev->driver_data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248}
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 */
260static 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
Deepak Saxena089b1db2005-11-07 01:01:26 -0800269 if (!(hu = kzalloc(sizeof(struct hci_uart), GFP_KERNEL))) {
Marcel Holtmann77851622006-09-21 16:23:19 +0200270 BT_ERR("Can't allocate control structure");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 return -ENFILE;
272 }
Marcel Holtmann0372a662005-10-28 19:20:45 +0200273
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274 tty->disc_data = hu;
275 hu->tty = tty;
Alan Cox33f0f882006-01-09 20:54:13 -0800276 tty->receive_room = 65536;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277
278 spin_lock_init(&hu->rx_lock);
279
280 /* Flush any pending characters in the driver and line discipline. */
Marcel Holtmann0372a662005-10-28 19:20:45 +0200281
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 /* FIXME: why is this needed. Note don't use ldisc_ref here as the
283 open path is before the ldisc is referencable */
Marcel Holtmann0372a662005-10-28 19:20:45 +0200284
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285 if (tty->ldisc.flush_buffer)
286 tty->ldisc.flush_buffer(tty);
287
Marcel Holtmann420cc352006-07-06 15:53:31 +0200288 if (tty->driver && tty->driver->flush_buffer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 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 */
299static 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;
310 hci_uart_close(hdev);
311
312 if (test_and_clear_bit(HCI_UART_PROTO_SET, &hu->flags)) {
313 hu->proto->close(hu);
314 hci_unregister_dev(hdev);
315 hci_free_dev(hdev);
316 }
317 }
318}
319
320/* hci_uart_tty_wakeup()
321 *
322 * Callback for transmit wakeup. Called when low level
323 * device driver can accept more send data.
324 *
325 * Arguments: tty pointer to associated tty instance data
326 * Return Value: None
327 */
328static void hci_uart_tty_wakeup(struct tty_struct *tty)
329{
330 struct hci_uart *hu = (void *)tty->disc_data;
331
332 BT_DBG("");
333
334 if (!hu)
335 return;
336
337 clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
338
339 if (tty != hu->tty)
340 return;
341
342 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
343 hci_uart_tx_wakeup(hu);
344}
345
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346/* hci_uart_tty_receive()
347 *
348 * Called by tty low level driver when receive data is
349 * available.
350 *
351 * Arguments: tty pointer to tty isntance data
352 * data pointer to received data
353 * flags pointer to flags for data
354 * count count of received data in bytes
355 *
356 * Return Value: None
357 */
Marcel Holtmann77851622006-09-21 16:23:19 +0200358static void hci_uart_tty_receive(struct tty_struct *tty, const u8 *data, char *flags, int count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359{
360 struct hci_uart *hu = (void *)tty->disc_data;
Marcel Holtmann0372a662005-10-28 19:20:45 +0200361
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 if (!hu || tty != hu->tty)
363 return;
364
365 if (!test_bit(HCI_UART_PROTO_SET, &hu->flags))
366 return;
Marcel Holtmann0372a662005-10-28 19:20:45 +0200367
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368 spin_lock(&hu->rx_lock);
369 hu->proto->recv(hu, (void *) data, count);
370 hu->hdev->stat.byte_rx += count;
371 spin_unlock(&hu->rx_lock);
372
Marcel Holtmann77851622006-09-21 16:23:19 +0200373 if (test_and_clear_bit(TTY_THROTTLED, &tty->flags) &&
374 tty->driver->unthrottle)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 tty->driver->unthrottle(tty);
376}
377
378static int hci_uart_register_dev(struct hci_uart *hu)
379{
380 struct hci_dev *hdev;
381
382 BT_DBG("");
383
384 /* Initialize and register HCI device */
385 hdev = hci_alloc_dev();
386 if (!hdev) {
387 BT_ERR("Can't allocate HCI device");
388 return -ENOMEM;
389 }
390
391 hu->hdev = hdev;
392
393 hdev->type = HCI_UART;
394 hdev->driver_data = hu;
395
396 hdev->open = hci_uart_open;
397 hdev->close = hci_uart_close;
398 hdev->flush = hci_uart_flush;
399 hdev->send = hci_uart_send_frame;
400 hdev->destruct = hci_uart_destruct;
401
402 hdev->owner = THIS_MODULE;
403
404 if (reset)
405 set_bit(HCI_QUIRK_RESET_ON_INIT, &hdev->quirks);
406
407 if (hci_register_dev(hdev) < 0) {
408 BT_ERR("Can't register HCI device");
409 hci_free_dev(hdev);
410 return -ENODEV;
411 }
412
413 return 0;
414}
415
416static int hci_uart_set_proto(struct hci_uart *hu, int id)
417{
418 struct hci_uart_proto *p;
Marcel Holtmann0372a662005-10-28 19:20:45 +0200419 int err;
420
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421 p = hci_uart_get_proto(id);
422 if (!p)
423 return -EPROTONOSUPPORT;
424
425 err = p->open(hu);
426 if (err)
427 return err;
428
429 hu->proto = p;
430
431 err = hci_uart_register_dev(hu);
432 if (err) {
433 p->close(hu);
434 return err;
435 }
Marcel Holtmann0372a662005-10-28 19:20:45 +0200436
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 return 0;
438}
439
440/* hci_uart_tty_ioctl()
441 *
442 * Process IOCTL system call for the tty device.
443 *
444 * Arguments:
445 *
446 * tty pointer to tty instance data
447 * file pointer to open file object for device
448 * cmd IOCTL command code
449 * arg argument for IOCTL call (cmd dependent)
450 *
451 * Return Value: Command dependent
452 */
453static int hci_uart_tty_ioctl(struct tty_struct *tty, struct file * file,
Marcel Holtmann0372a662005-10-28 19:20:45 +0200454 unsigned int cmd, unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455{
456 struct hci_uart *hu = (void *)tty->disc_data;
457 int err = 0;
458
459 BT_DBG("");
460
461 /* Verify the status of the device */
462 if (!hu)
463 return -EBADF;
464
465 switch (cmd) {
466 case HCIUARTSETPROTO:
467 if (!test_and_set_bit(HCI_UART_PROTO_SET, &hu->flags)) {
468 err = hci_uart_set_proto(hu, arg);
469 if (err) {
470 clear_bit(HCI_UART_PROTO_SET, &hu->flags);
471 return err;
472 }
473 tty->low_latency = 1;
Marcel Holtmann0372a662005-10-28 19:20:45 +0200474 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475 return -EBUSY;
476
477 case HCIUARTGETPROTO:
478 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
479 return hu->proto->id;
480 return -EUNATCH;
Marcel Holtmann0372a662005-10-28 19:20:45 +0200481
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 default:
483 err = n_tty_ioctl(tty, file, cmd, arg);
484 break;
485 };
486
487 return err;
488}
489
490/*
491 * We don't provide read/write/poll interface for user space.
492 */
Marcel Holtmann0372a662005-10-28 19:20:45 +0200493static ssize_t hci_uart_tty_read(struct tty_struct *tty, struct file *file,
494 unsigned char __user *buf, size_t nr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495{
496 return 0;
497}
498
Marcel Holtmann0372a662005-10-28 19:20:45 +0200499static ssize_t hci_uart_tty_write(struct tty_struct *tty, struct file *file,
500 const unsigned char *data, size_t count)
501{
502 return 0;
503}
504
505static unsigned int hci_uart_tty_poll(struct tty_struct *tty,
506 struct file *filp, poll_table *wait)
507{
508 return 0;
509}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510
511static int __init hci_uart_init(void)
512{
513 static struct tty_ldisc hci_uart_ldisc;
514 int err;
515
516 BT_INFO("HCI UART driver ver %s", VERSION);
517
518 /* Register the tty discipline */
519
520 memset(&hci_uart_ldisc, 0, sizeof (hci_uart_ldisc));
Marcel Holtmann0372a662005-10-28 19:20:45 +0200521 hci_uart_ldisc.magic = TTY_LDISC_MAGIC;
522 hci_uart_ldisc.name = "n_hci";
523 hci_uart_ldisc.open = hci_uart_tty_open;
524 hci_uart_ldisc.close = hci_uart_tty_close;
525 hci_uart_ldisc.read = hci_uart_tty_read;
526 hci_uart_ldisc.write = hci_uart_tty_write;
527 hci_uart_ldisc.ioctl = hci_uart_tty_ioctl;
528 hci_uart_ldisc.poll = hci_uart_tty_poll;
Marcel Holtmann0372a662005-10-28 19:20:45 +0200529 hci_uart_ldisc.receive_buf = hci_uart_tty_receive;
530 hci_uart_ldisc.write_wakeup = hci_uart_tty_wakeup;
531 hci_uart_ldisc.owner = THIS_MODULE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532
533 if ((err = tty_register_ldisc(N_HCI, &hci_uart_ldisc))) {
534 BT_ERR("HCI line discipline registration failed. (%d)", err);
535 return err;
536 }
537
538#ifdef CONFIG_BT_HCIUART_H4
539 h4_init();
540#endif
541#ifdef CONFIG_BT_HCIUART_BCSP
542 bcsp_init();
543#endif
544
545 return 0;
546}
547
548static void __exit hci_uart_exit(void)
549{
550 int err;
551
552#ifdef CONFIG_BT_HCIUART_H4
553 h4_deinit();
554#endif
555#ifdef CONFIG_BT_HCIUART_BCSP
556 bcsp_deinit();
557#endif
558
559 /* Release tty registration of line discipline */
Alexey Dobriyan64ccd712005-06-23 00:10:33 -0700560 if ((err = tty_unregister_ldisc(N_HCI)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561 BT_ERR("Can't unregister HCI line discipline (%d)", err);
562}
563
564module_init(hci_uart_init);
565module_exit(hci_uart_exit);
566
567module_param(reset, bool, 0644);
568MODULE_PARM_DESC(reset, "Send HCI reset command on initialization");
569
570MODULE_AUTHOR("Maxim Krasnyansky <maxk@qualcomm.com>, Marcel Holtmann <marcel@holtmann.org>");
571MODULE_DESCRIPTION("Bluetooth HCI UART driver ver " VERSION);
572MODULE_VERSION(VERSION);
573MODULE_LICENSE("GPL");
574MODULE_ALIAS_LDISC(N_HCI);