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1/*
2 *
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 *
24 */
25
26#include <linux/module.h>
27
28#include <linux/kernel.h>
29#include <linux/init.h>
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#define VERSION "2.2"
50
51static struct hci_uart_proto *hup[HCI_UART_MAX_PROTO];
52
53int hci_uart_register_proto(struct hci_uart_proto *p)
54{
55 if (p->id >= HCI_UART_MAX_PROTO)
56 return -EINVAL;
57
58 if (hup[p->id])
59 return -EEXIST;
60
61 hup[p->id] = p;
62
63 return 0;
64}
65
66int hci_uart_unregister_proto(struct hci_uart_proto *p)
67{
68 if (p->id >= HCI_UART_MAX_PROTO)
69 return -EINVAL;
70
71 if (!hup[p->id])
72 return -EINVAL;
73
74 hup[p->id] = NULL;
75
76 return 0;
77}
78
79static struct hci_uart_proto *hci_uart_get_proto(unsigned int id)
80{
81 if (id >= HCI_UART_MAX_PROTO)
82 return NULL;
83
84 return hup[id];
85}
86
87static inline void hci_uart_tx_complete(struct hci_uart *hu, int pkt_type)
88{
89 struct hci_dev *hdev = hu->hdev;
90
91 /* Update HCI stat counters */
92 switch (pkt_type) {
93 case HCI_COMMAND_PKT:
94 hdev->stat.cmd_tx++;
95 break;
96
97 case HCI_ACLDATA_PKT:
98 hdev->stat.acl_tx++;
99 break;
100
101 case HCI_SCODATA_PKT:
102 hdev->stat.sco_tx++;
103 break;
104 }
105}
106
107static inline struct sk_buff *hci_uart_dequeue(struct hci_uart *hu)
108{
109 struct sk_buff *skb = hu->tx_skb;
110
111 if (!skb)
112 skb = hu->proto->dequeue(hu);
113 else
114 hu->tx_skb = NULL;
115
116 return skb;
117}
118
119int hci_uart_tx_wakeup(struct hci_uart *hu)
120{
121 struct tty_struct *tty = hu->tty;
122 struct hci_dev *hdev = hu->hdev;
123 struct sk_buff *skb;
124
125 if (test_and_set_bit(HCI_UART_SENDING, &hu->tx_state)) {
126 set_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
127 return 0;
128 }
129
130 BT_DBG("");
131
132restart:
133 clear_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
134
135 while ((skb = hci_uart_dequeue(hu))) {
136 int len;
137
138 set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
139 len = tty->ops->write(tty, skb->data, skb->len);
140 hdev->stat.byte_tx += len;
141
142 skb_pull(skb, len);
143 if (skb->len) {
144 hu->tx_skb = skb;
145 break;
146 }
147
148 hci_uart_tx_complete(hu, bt_cb(skb)->pkt_type);
149 kfree_skb(skb);
150 }
151
152 if (test_bit(HCI_UART_TX_WAKEUP, &hu->tx_state))
153 goto restart;
154
155 clear_bit(HCI_UART_SENDING, &hu->tx_state);
156 return 0;
157}
158
159static void hci_uart_init_work(struct work_struct *work)
160{
161 struct hci_uart *hu = container_of(work, struct hci_uart, init_ready);
162 int err;
163
164 if (!test_and_clear_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
165 return;
166
167 err = hci_register_dev(hu->hdev);
168 if (err < 0) {
169 BT_ERR("Can't register HCI device");
170 hci_free_dev(hu->hdev);
171 hu->hdev = NULL;
172 hu->proto->close(hu);
173 }
174
175 set_bit(HCI_UART_REGISTERED, &hu->flags);
176}
177
178int hci_uart_init_ready(struct hci_uart *hu)
179{
180 if (!test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
181 return -EALREADY;
182
183 schedule_work(&hu->init_ready);
184
185 return 0;
186}
187
188/* ------- Interface to HCI layer ------ */
189/* Initialize device */
190static int hci_uart_open(struct hci_dev *hdev)
191{
192 BT_DBG("%s %p", hdev->name, hdev);
193
194 /* Nothing to do for UART driver */
195
196 set_bit(HCI_RUNNING, &hdev->flags);
197
198 return 0;
199}
200
201/* Reset device */
202static int hci_uart_flush(struct hci_dev *hdev)
203{
204 struct hci_uart *hu = hci_get_drvdata(hdev);
205 struct tty_struct *tty = hu->tty;
206
207 BT_DBG("hdev %p tty %p", hdev, tty);
208
209 if (hu->tx_skb) {
210 kfree_skb(hu->tx_skb); hu->tx_skb = NULL;
211 }
212
213 /* Flush any pending characters in the driver and discipline. */
214 tty_ldisc_flush(tty);
215 tty_driver_flush_buffer(tty);
216
217 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
218 hu->proto->flush(hu);
219
220 return 0;
221}
222
223/* Close device */
224static int hci_uart_close(struct hci_dev *hdev)
225{
226 BT_DBG("hdev %p", hdev);
227
228 if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
229 return 0;
230
231 hci_uart_flush(hdev);
232 hdev->flush = NULL;
233 return 0;
234}
235
236/* Send frames from HCI layer */
237static int hci_uart_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
238{
239 struct hci_uart *hu = hci_get_drvdata(hdev);
240
241 if (!test_bit(HCI_RUNNING, &hdev->flags))
242 return -EBUSY;
243
244 BT_DBG("%s: type %d len %d", hdev->name, bt_cb(skb)->pkt_type, skb->len);
245
246 hu->proto->enqueue(hu, skb);
247
248 hci_uart_tx_wakeup(hu);
249
250 return 0;
251}
252
253/* ------ LDISC part ------ */
254/* hci_uart_tty_open
255 *
256 * Called when line discipline changed to HCI_UART.
257 *
258 * Arguments:
259 * tty pointer to tty info structure
260 * Return Value:
261 * 0 if success, otherwise error code
262 */
263static int hci_uart_tty_open(struct tty_struct *tty)
264{
265 struct hci_uart *hu;
266
267 BT_DBG("tty %p", tty);
268
269 /* Error if the tty has no write op instead of leaving an exploitable
270 hole */
271 if (tty->ops->write == NULL)
272 return -EOPNOTSUPP;
273
274 hu = kzalloc(sizeof(struct hci_uart), GFP_KERNEL);
275 if (!hu) {
276 BT_ERR("Can't allocate control structure");
277 return -ENFILE;
278 }
279
280 tty->disc_data = hu;
281 hu->tty = tty;
282 tty->receive_room = 65536;
283
284 INIT_WORK(&hu->init_ready, hci_uart_init_work);
285
286 spin_lock_init(&hu->rx_lock);
287
288 /* Flush any pending characters in the driver and line discipline. */
289
290 /* FIXME: why is this needed. Note don't use ldisc_ref here as the
291 open path is before the ldisc is referencable */
292
293 if (tty->ldisc->ops->flush_buffer)
294 tty->ldisc->ops->flush_buffer(tty);
295 tty_driver_flush_buffer(tty);
296
297 return 0;
298}
299
300/* hci_uart_tty_close()
301 *
302 * Called when the line discipline is changed to something
303 * else, the tty is closed, or the tty detects a hangup.
304 */
305static void hci_uart_tty_close(struct tty_struct *tty)
306{
307 struct hci_uart *hu = (void *)tty->disc_data;
308 struct hci_dev *hdev;
309
310 BT_DBG("tty %p", tty);
311
312 /* Detach from the tty */
313 tty->disc_data = NULL;
314
315 if (!hu)
316 return;
317
318 hdev = hu->hdev;
319 if (hdev)
320 hci_uart_close(hdev);
321
322 if (test_and_clear_bit(HCI_UART_PROTO_SET, &hu->flags)) {
323 if (hdev) {
324 if (test_bit(HCI_UART_REGISTERED, &hu->flags))
325 hci_unregister_dev(hdev);
326 hci_free_dev(hdev);
327 }
328 hu->proto->close(hu);
329 }
330
331 kfree(hu);
332}
333
334/* hci_uart_tty_wakeup()
335 *
336 * Callback for transmit wakeup. Called when low level
337 * device driver can accept more send data.
338 *
339 * Arguments: tty pointer to associated tty instance data
340 * Return Value: None
341 */
342static void hci_uart_tty_wakeup(struct tty_struct *tty)
343{
344 struct hci_uart *hu = (void *)tty->disc_data;
345
346 BT_DBG("");
347
348 if (!hu)
349 return;
350
351 clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
352
353 if (tty != hu->tty)
354 return;
355
356 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
357 hci_uart_tx_wakeup(hu);
358}
359
360/* hci_uart_tty_receive()
361 *
362 * Called by tty low level driver when receive data is
363 * available.
364 *
365 * Arguments: tty pointer to tty isntance data
366 * data pointer to received data
367 * flags pointer to flags for data
368 * count count of received data in bytes
369 *
370 * Return Value: None
371 */
372static void hci_uart_tty_receive(struct tty_struct *tty, const u8 *data, char *flags, int count)
373{
374 struct hci_uart *hu = (void *)tty->disc_data;
375
376 if (!hu || tty != hu->tty)
377 return;
378
379 if (!test_bit(HCI_UART_PROTO_SET, &hu->flags))
380 return;
381
382 spin_lock(&hu->rx_lock);
383 hu->proto->recv(hu, (void *) data, count);
384
385 if (hu->hdev)
386 hu->hdev->stat.byte_rx += count;
387
388 spin_unlock(&hu->rx_lock);
389
390 tty_unthrottle(tty);
391}
392
393static int hci_uart_register_dev(struct hci_uart *hu)
394{
395 struct hci_dev *hdev;
396
397 BT_DBG("");
398
399 /* Initialize and register HCI device */
400 hdev = hci_alloc_dev();
401 if (!hdev) {
402 BT_ERR("Can't allocate HCI device");
403 return -ENOMEM;
404 }
405
406 hu->hdev = hdev;
407
408 hdev->bus = HCI_UART;
409 hci_set_drvdata(hdev, hu);
410
411 hdev->open = hci_uart_open;
412 hdev->close = hci_uart_close;
413 hdev->flush = hci_uart_flush;
414 hdev->send = hci_uart_send_frame;
415 SET_HCIDEV_DEV(hdev, hu->tty->dev);
416
417 if (test_bit(HCI_UART_RAW_DEVICE, &hu->hdev_flags))
418 set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks);
419
420 if (!test_bit(HCI_UART_RESET_ON_INIT, &hu->hdev_flags))
421 set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);
422
423 if (test_bit(HCI_UART_CREATE_AMP, &hu->hdev_flags))
424 hdev->dev_type = HCI_AMP;
425 else
426 hdev->dev_type = HCI_BREDR;
427
428 if (test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
429 return 0;
430
431 if (hci_register_dev(hdev) < 0) {
432 BT_ERR("Can't register HCI device");
433 hci_free_dev(hdev);
434 return -ENODEV;
435 }
436
437 set_bit(HCI_UART_REGISTERED, &hu->flags);
438
439 return 0;
440}
441
442static int hci_uart_set_proto(struct hci_uart *hu, int id)
443{
444 struct hci_uart_proto *p;
445 int err;
446
447 p = hci_uart_get_proto(id);
448 if (!p)
449 return -EPROTONOSUPPORT;
450
451 err = p->open(hu);
452 if (err)
453 return err;
454
455 hu->proto = p;
456
457 err = hci_uart_register_dev(hu);
458 if (err) {
459 p->close(hu);
460 return err;
461 }
462
463 return 0;
464}
465
466/* hci_uart_tty_ioctl()
467 *
468 * Process IOCTL system call for the tty device.
469 *
470 * Arguments:
471 *
472 * tty pointer to tty instance data
473 * file pointer to open file object for device
474 * cmd IOCTL command code
475 * arg argument for IOCTL call (cmd dependent)
476 *
477 * Return Value: Command dependent
478 */
479static int hci_uart_tty_ioctl(struct tty_struct *tty, struct file * file,
480 unsigned int cmd, unsigned long arg)
481{
482 struct hci_uart *hu = (void *)tty->disc_data;
483 int err = 0;
484
485 BT_DBG("");
486
487 /* Verify the status of the device */
488 if (!hu)
489 return -EBADF;
490
491 switch (cmd) {
492 case HCIUARTSETPROTO:
493 if (!test_and_set_bit(HCI_UART_PROTO_SET, &hu->flags)) {
494 err = hci_uart_set_proto(hu, arg);
495 if (err) {
496 clear_bit(HCI_UART_PROTO_SET, &hu->flags);
497 return err;
498 }
499 } else
500 return -EBUSY;
501 break;
502
503 case HCIUARTGETPROTO:
504 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
505 return hu->proto->id;
506 return -EUNATCH;
507
508 case HCIUARTGETDEVICE:
509 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
510 return hu->hdev->id;
511 return -EUNATCH;
512
513 case HCIUARTSETFLAGS:
514 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
515 return -EBUSY;
516 hu->hdev_flags = arg;
517 break;
518
519 case HCIUARTGETFLAGS:
520 return hu->hdev_flags;
521
522 default:
523 err = n_tty_ioctl_helper(tty, file, cmd, arg);
524 break;
525 }
526
527 return err;
528}
529
530/*
531 * We don't provide read/write/poll interface for user space.
532 */
533static ssize_t hci_uart_tty_read(struct tty_struct *tty, struct file *file,
534 unsigned char __user *buf, size_t nr)
535{
536 return 0;
537}
538
539static ssize_t hci_uart_tty_write(struct tty_struct *tty, struct file *file,
540 const unsigned char *data, size_t count)
541{
542 return 0;
543}
544
545static unsigned int hci_uart_tty_poll(struct tty_struct *tty,
546 struct file *filp, poll_table *wait)
547{
548 return 0;
549}
550
551static int __init hci_uart_init(void)
552{
553 static struct tty_ldisc_ops hci_uart_ldisc;
554 int err;
555
556 BT_INFO("HCI UART driver ver %s", VERSION);
557
558 /* Register the tty discipline */
559
560 memset(&hci_uart_ldisc, 0, sizeof (hci_uart_ldisc));
561 hci_uart_ldisc.magic = TTY_LDISC_MAGIC;
562 hci_uart_ldisc.name = "n_hci";
563 hci_uart_ldisc.open = hci_uart_tty_open;
564 hci_uart_ldisc.close = hci_uart_tty_close;
565 hci_uart_ldisc.read = hci_uart_tty_read;
566 hci_uart_ldisc.write = hci_uart_tty_write;
567 hci_uart_ldisc.ioctl = hci_uart_tty_ioctl;
568 hci_uart_ldisc.poll = hci_uart_tty_poll;
569 hci_uart_ldisc.receive_buf = hci_uart_tty_receive;
570 hci_uart_ldisc.write_wakeup = hci_uart_tty_wakeup;
571 hci_uart_ldisc.owner = THIS_MODULE;
572
573 err = tty_register_ldisc(N_HCI, &hci_uart_ldisc);
574 if (err) {
575 BT_ERR("HCI line discipline registration failed. (%d)", err);
576 return err;
577 }
578
579#ifdef CONFIG_BT_HCIUART_H4
580 h4_init();
581#endif
582#ifdef CONFIG_BT_HCIUART_BCSP
583 bcsp_init();
584#endif
585#ifdef CONFIG_BT_HCIUART_LL
586 ll_init();
587#endif
588#ifdef CONFIG_BT_HCIUART_ATH3K
589 ath_init();
590#endif
591#ifdef CONFIG_BT_HCIUART_3WIRE
592 h5_init();
593#endif
594
595 return 0;
596}
597
598static void __exit hci_uart_exit(void)
599{
600 int err;
601
602#ifdef CONFIG_BT_HCIUART_H4
603 h4_deinit();
604#endif
605#ifdef CONFIG_BT_HCIUART_BCSP
606 bcsp_deinit();
607#endif
608#ifdef CONFIG_BT_HCIUART_LL
609 ll_deinit();
610#endif
611#ifdef CONFIG_BT_HCIUART_ATH3K
612 ath_deinit();
613#endif
614#ifdef CONFIG_BT_HCIUART_3WIRE
615 h5_deinit();
616#endif
617
618 /* Release tty registration of line discipline */
619 err = tty_unregister_ldisc(N_HCI);
620 if (err)
621 BT_ERR("Can't unregister HCI line discipline (%d)", err);
622}
623
624module_init(hci_uart_init);
625module_exit(hci_uart_exit);
626
627MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
628MODULE_DESCRIPTION("Bluetooth HCI UART driver ver " VERSION);
629MODULE_VERSION(VERSION);
630MODULE_LICENSE("GPL");
631MODULE_ALIAS_LDISC(N_HCI);
1/*
2 *
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 *
24 */
25
26#include <linux/module.h>
27
28#include <linux/kernel.h>
29#include <linux/init.h>
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#define VERSION "2.2"
50
51static int reset = 0;
52
53static struct hci_uart_proto *hup[HCI_UART_MAX_PROTO];
54
55int hci_uart_register_proto(struct hci_uart_proto *p)
56{
57 if (p->id >= HCI_UART_MAX_PROTO)
58 return -EINVAL;
59
60 if (hup[p->id])
61 return -EEXIST;
62
63 hup[p->id] = p;
64
65 return 0;
66}
67
68int hci_uart_unregister_proto(struct hci_uart_proto *p)
69{
70 if (p->id >= HCI_UART_MAX_PROTO)
71 return -EINVAL;
72
73 if (!hup[p->id])
74 return -EINVAL;
75
76 hup[p->id] = NULL;
77
78 return 0;
79}
80
81static struct hci_uart_proto *hci_uart_get_proto(unsigned int id)
82{
83 if (id >= HCI_UART_MAX_PROTO)
84 return NULL;
85
86 return hup[id];
87}
88
89static inline void hci_uart_tx_complete(struct hci_uart *hu, int pkt_type)
90{
91 struct hci_dev *hdev = hu->hdev;
92
93 /* Update HCI stat counters */
94 switch (pkt_type) {
95 case HCI_COMMAND_PKT:
96 hdev->stat.cmd_tx++;
97 break;
98
99 case HCI_ACLDATA_PKT:
100 hdev->stat.acl_tx++;
101 break;
102
103 case HCI_SCODATA_PKT:
104 hdev->stat.sco_tx++;
105 break;
106 }
107}
108
109static inline struct sk_buff *hci_uart_dequeue(struct hci_uart *hu)
110{
111 struct sk_buff *skb = hu->tx_skb;
112
113 if (!skb)
114 skb = hu->proto->dequeue(hu);
115 else
116 hu->tx_skb = NULL;
117
118 return skb;
119}
120
121int hci_uart_tx_wakeup(struct hci_uart *hu)
122{
123 struct tty_struct *tty = hu->tty;
124 struct hci_dev *hdev = hu->hdev;
125 struct sk_buff *skb;
126
127 if (test_and_set_bit(HCI_UART_SENDING, &hu->tx_state)) {
128 set_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
129 return 0;
130 }
131
132 BT_DBG("");
133
134restart:
135 clear_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
136
137 while ((skb = hci_uart_dequeue(hu))) {
138 int len;
139
140 set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
141 len = tty->ops->write(tty, skb->data, skb->len);
142 hdev->stat.byte_tx += len;
143
144 skb_pull(skb, len);
145 if (skb->len) {
146 hu->tx_skb = skb;
147 break;
148 }
149
150 hci_uart_tx_complete(hu, bt_cb(skb)->pkt_type);
151 kfree_skb(skb);
152 }
153
154 if (test_bit(HCI_UART_TX_WAKEUP, &hu->tx_state))
155 goto restart;
156
157 clear_bit(HCI_UART_SENDING, &hu->tx_state);
158 return 0;
159}
160
161/* ------- Interface to HCI layer ------ */
162/* Initialize device */
163static int hci_uart_open(struct hci_dev *hdev)
164{
165 BT_DBG("%s %p", hdev->name, hdev);
166
167 /* Nothing to do for UART driver */
168
169 set_bit(HCI_RUNNING, &hdev->flags);
170
171 return 0;
172}
173
174/* Reset device */
175static int hci_uart_flush(struct hci_dev *hdev)
176{
177 struct hci_uart *hu = (struct hci_uart *) hdev->driver_data;
178 struct tty_struct *tty = hu->tty;
179
180 BT_DBG("hdev %p tty %p", hdev, tty);
181
182 if (hu->tx_skb) {
183 kfree_skb(hu->tx_skb); hu->tx_skb = NULL;
184 }
185
186 /* Flush any pending characters in the driver and discipline. */
187 tty_ldisc_flush(tty);
188 tty_driver_flush_buffer(tty);
189
190 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
191 hu->proto->flush(hu);
192
193 return 0;
194}
195
196/* Close device */
197static int hci_uart_close(struct hci_dev *hdev)
198{
199 BT_DBG("hdev %p", hdev);
200
201 if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
202 return 0;
203
204 hci_uart_flush(hdev);
205 hdev->flush = NULL;
206 return 0;
207}
208
209/* Send frames from HCI layer */
210static int hci_uart_send_frame(struct sk_buff *skb)
211{
212 struct hci_dev* hdev = (struct hci_dev *) skb->dev;
213 struct hci_uart *hu;
214
215 if (!hdev) {
216 BT_ERR("Frame for unknown device (hdev=NULL)");
217 return -ENODEV;
218 }
219
220 if (!test_bit(HCI_RUNNING, &hdev->flags))
221 return -EBUSY;
222
223 hu = (struct hci_uart *) hdev->driver_data;
224
225 BT_DBG("%s: type %d len %d", hdev->name, bt_cb(skb)->pkt_type, skb->len);
226
227 hu->proto->enqueue(hu, skb);
228
229 hci_uart_tx_wakeup(hu);
230
231 return 0;
232}
233
234static void hci_uart_destruct(struct hci_dev *hdev)
235{
236 if (!hdev)
237 return;
238
239 BT_DBG("%s", hdev->name);
240 kfree(hdev->driver_data);
241}
242
243/* ------ LDISC part ------ */
244/* hci_uart_tty_open
245 *
246 * Called when line discipline changed to HCI_UART.
247 *
248 * Arguments:
249 * tty pointer to tty info structure
250 * Return Value:
251 * 0 if success, otherwise error code
252 */
253static int hci_uart_tty_open(struct tty_struct *tty)
254{
255 struct hci_uart *hu = (void *) tty->disc_data;
256
257 BT_DBG("tty %p", tty);
258
259 /* FIXME: This btw is bogus, nothing requires the old ldisc to clear
260 the pointer */
261 if (hu)
262 return -EEXIST;
263
264 /* Error if the tty has no write op instead of leaving an exploitable
265 hole */
266 if (tty->ops->write == NULL)
267 return -EOPNOTSUPP;
268
269 if (!(hu = kzalloc(sizeof(struct hci_uart), GFP_KERNEL))) {
270 BT_ERR("Can't allocate control structure");
271 return -ENFILE;
272 }
273
274 tty->disc_data = hu;
275 hu->tty = tty;
276 tty->receive_room = 65536;
277
278 spin_lock_init(&hu->rx_lock);
279
280 /* Flush any pending characters in the driver and line discipline. */
281
282 /* FIXME: why is this needed. Note don't use ldisc_ref here as the
283 open path is before the ldisc is referencable */
284
285 if (tty->ldisc->ops->flush_buffer)
286 tty->ldisc->ops->flush_buffer(tty);
287 tty_driver_flush_buffer(tty);
288
289 return 0;
290}
291
292/* hci_uart_tty_close()
293 *
294 * Called when the line discipline is changed to something
295 * else, the tty is closed, or the tty detects a hangup.
296 */
297static void hci_uart_tty_close(struct tty_struct *tty)
298{
299 struct hci_uart *hu = (void *)tty->disc_data;
300
301 BT_DBG("tty %p", tty);
302
303 /* Detach from the tty */
304 tty->disc_data = NULL;
305
306 if (hu) {
307 struct hci_dev *hdev = hu->hdev;
308
309 if (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 if (hdev) {
315 hci_unregister_dev(hdev);
316 hci_free_dev(hdev);
317 }
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 */
330static 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
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 */
360static void hci_uart_tty_receive(struct tty_struct *tty, const u8 *data, char *flags, int count)
361{
362 struct hci_uart *hu = (void *)tty->disc_data;
363
364 if (!hu || tty != hu->tty)
365 return;
366
367 if (!test_bit(HCI_UART_PROTO_SET, &hu->flags))
368 return;
369
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
375 tty_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->bus = 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 hdev->parent = hu->tty->dev;
402
403 hdev->owner = THIS_MODULE;
404
405 if (!reset)
406 set_bit(HCI_QUIRK_NO_RESET, &hdev->quirks);
407
408 if (test_bit(HCI_UART_RAW_DEVICE, &hu->hdev_flags))
409 set_bit(HCI_QUIRK_RAW_DEVICE, &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
420static int hci_uart_set_proto(struct hci_uart *hu, int id)
421{
422 struct hci_uart_proto *p;
423 int err;
424
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 }
440
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 */
457static int hci_uart_tty_ioctl(struct tty_struct *tty, struct file * file,
458 unsigned int cmd, unsigned long arg)
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 } else
478 return -EBUSY;
479 break;
480
481 case HCIUARTGETPROTO:
482 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
483 return hu->proto->id;
484 return -EUNATCH;
485
486 case HCIUARTGETDEVICE:
487 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
488 return hu->hdev->id;
489 return -EUNATCH;
490
491 case HCIUARTSETFLAGS:
492 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
493 return -EBUSY;
494 hu->hdev_flags = arg;
495 break;
496
497 case HCIUARTGETFLAGS:
498 return hu->hdev_flags;
499
500 default:
501 err = n_tty_ioctl_helper(tty, file, cmd, arg);
502 break;
503 };
504
505 return err;
506}
507
508/*
509 * We don't provide read/write/poll interface for user space.
510 */
511static ssize_t hci_uart_tty_read(struct tty_struct *tty, struct file *file,
512 unsigned char __user *buf, size_t nr)
513{
514 return 0;
515}
516
517static ssize_t hci_uart_tty_write(struct tty_struct *tty, struct file *file,
518 const unsigned char *data, size_t count)
519{
520 return 0;
521}
522
523static unsigned int hci_uart_tty_poll(struct tty_struct *tty,
524 struct file *filp, poll_table *wait)
525{
526 return 0;
527}
528
529static int __init hci_uart_init(void)
530{
531 static struct tty_ldisc_ops hci_uart_ldisc;
532 int err;
533
534 BT_INFO("HCI UART driver ver %s", VERSION);
535
536 /* Register the tty discipline */
537
538 memset(&hci_uart_ldisc, 0, sizeof (hci_uart_ldisc));
539 hci_uart_ldisc.magic = TTY_LDISC_MAGIC;
540 hci_uart_ldisc.name = "n_hci";
541 hci_uart_ldisc.open = hci_uart_tty_open;
542 hci_uart_ldisc.close = hci_uart_tty_close;
543 hci_uart_ldisc.read = hci_uart_tty_read;
544 hci_uart_ldisc.write = hci_uart_tty_write;
545 hci_uart_ldisc.ioctl = hci_uart_tty_ioctl;
546 hci_uart_ldisc.poll = hci_uart_tty_poll;
547 hci_uart_ldisc.receive_buf = hci_uart_tty_receive;
548 hci_uart_ldisc.write_wakeup = hci_uart_tty_wakeup;
549 hci_uart_ldisc.owner = THIS_MODULE;
550
551 if ((err = tty_register_ldisc(N_HCI, &hci_uart_ldisc))) {
552 BT_ERR("HCI line discipline registration failed. (%d)", err);
553 return err;
554 }
555
556#ifdef CONFIG_BT_HCIUART_H4
557 h4_init();
558#endif
559#ifdef CONFIG_BT_HCIUART_BCSP
560 bcsp_init();
561#endif
562#ifdef CONFIG_BT_HCIUART_LL
563 ll_init();
564#endif
565#ifdef CONFIG_BT_HCIUART_ATH3K
566 ath_init();
567#endif
568
569 return 0;
570}
571
572static void __exit hci_uart_exit(void)
573{
574 int err;
575
576#ifdef CONFIG_BT_HCIUART_H4
577 h4_deinit();
578#endif
579#ifdef CONFIG_BT_HCIUART_BCSP
580 bcsp_deinit();
581#endif
582#ifdef CONFIG_BT_HCIUART_LL
583 ll_deinit();
584#endif
585#ifdef CONFIG_BT_HCIUART_ATH3K
586 ath_deinit();
587#endif
588
589 /* Release tty registration of line discipline */
590 if ((err = tty_unregister_ldisc(N_HCI)))
591 BT_ERR("Can't unregister HCI line discipline (%d)", err);
592}
593
594module_init(hci_uart_init);
595module_exit(hci_uart_exit);
596
597module_param(reset, bool, 0644);
598MODULE_PARM_DESC(reset, "Send HCI reset command on initialization");
599
600MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
601MODULE_DESCRIPTION("Bluetooth HCI UART driver ver " VERSION);
602MODULE_VERSION(VERSION);
603MODULE_LICENSE("GPL");
604MODULE_ALIAS_LDISC(N_HCI);