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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
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
189
190static int hci_uart_open(struct hci_dev *hdev)
191{
192 BT_DBG("%s %p", hdev->name, hdev);
193
194
195
196 set_bit(HCI_RUNNING, &hdev->flags);
197
198 return 0;
199}
200
201
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
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
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
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
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260
261
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
270
271 if (tty->ops->write == NULL)
272 return -EOPNOTSUPP;
273
274 if (!(hu = kzalloc(sizeof(struct hci_uart), GFP_KERNEL))) {
275 BT_ERR("Can't allocate control structure");
276 return -ENFILE;
277 }
278
279 tty->disc_data = hu;
280 hu->tty = tty;
281 tty->receive_room = 65536;
282
283 INIT_WORK(&hu->init_ready, hci_uart_init_work);
284
285 spin_lock_init(&hu->rx_lock);
286
287
288
289
290
291
292 if (tty->ldisc->ops->flush_buffer)
293 tty->ldisc->ops->flush_buffer(tty);
294 tty_driver_flush_buffer(tty);
295
296 return 0;
297}
298
299
300
301
302
303
304static void hci_uart_tty_close(struct tty_struct *tty)
305{
306 struct hci_uart *hu = (void *)tty->disc_data;
307 struct hci_dev *hdev;
308
309 BT_DBG("tty %p", tty);
310
311
312 tty->disc_data = NULL;
313
314 if (!hu)
315 return;
316
317 hdev = hu->hdev;
318 if (hdev)
319 hci_uart_close(hdev);
320
321 if (test_and_clear_bit(HCI_UART_PROTO_SET, &hu->flags)) {
322 if (hdev) {
323 if (test_bit(HCI_UART_REGISTERED, &hu->flags))
324 hci_unregister_dev(hdev);
325 hci_free_dev(hdev);
326 }
327 hu->proto->close(hu);
328 }
329
330 kfree(hu);
331}
332
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339
340
341static void hci_uart_tty_wakeup(struct tty_struct *tty)
342{
343 struct hci_uart *hu = (void *)tty->disc_data;
344
345 BT_DBG("");
346
347 if (!hu)
348 return;
349
350 clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
351
352 if (tty != hu->tty)
353 return;
354
355 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
356 hci_uart_tx_wakeup(hu);
357}
358
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369
370
371static void hci_uart_tty_receive(struct tty_struct *tty, const u8 *data, char *flags, int count)
372{
373 struct hci_uart *hu = (void *)tty->disc_data;
374
375 if (!hu || tty != hu->tty)
376 return;
377
378 if (!test_bit(HCI_UART_PROTO_SET, &hu->flags))
379 return;
380
381 spin_lock(&hu->rx_lock);
382 hu->proto->recv(hu, (void *) data, count);
383
384 if (hu->hdev)
385 hu->hdev->stat.byte_rx += count;
386
387 spin_unlock(&hu->rx_lock);
388
389 tty_unthrottle(tty);
390}
391
392static int hci_uart_register_dev(struct hci_uart *hu)
393{
394 struct hci_dev *hdev;
395
396 BT_DBG("");
397
398
399 hdev = hci_alloc_dev();
400 if (!hdev) {
401 BT_ERR("Can't allocate HCI device");
402 return -ENOMEM;
403 }
404
405 hu->hdev = hdev;
406
407 hdev->bus = HCI_UART;
408 hci_set_drvdata(hdev, hu);
409
410 hdev->open = hci_uart_open;
411 hdev->close = hci_uart_close;
412 hdev->flush = hci_uart_flush;
413 hdev->send = hci_uart_send_frame;
414 SET_HCIDEV_DEV(hdev, hu->tty->dev);
415
416 if (test_bit(HCI_UART_RAW_DEVICE, &hu->hdev_flags))
417 set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks);
418
419 if (!test_bit(HCI_UART_RESET_ON_INIT, &hu->hdev_flags))
420 set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);
421
422 if (test_bit(HCI_UART_CREATE_AMP, &hu->hdev_flags))
423 hdev->dev_type = HCI_AMP;
424 else
425 hdev->dev_type = HCI_BREDR;
426
427 if (test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
428 return 0;
429
430 if (hci_register_dev(hdev) < 0) {
431 BT_ERR("Can't register HCI device");
432 hci_free_dev(hdev);
433 return -ENODEV;
434 }
435
436 set_bit(HCI_UART_REGISTERED, &hu->flags);
437
438 return 0;
439}
440
441static int hci_uart_set_proto(struct hci_uart *hu, int id)
442{
443 struct hci_uart_proto *p;
444 int err;
445
446 p = hci_uart_get_proto(id);
447 if (!p)
448 return -EPROTONOSUPPORT;
449
450 err = p->open(hu);
451 if (err)
452 return err;
453
454 hu->proto = p;
455
456 err = hci_uart_register_dev(hu);
457 if (err) {
458 p->close(hu);
459 return err;
460 }
461
462 return 0;
463}
464
465
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474
475
476
477
478static int hci_uart_tty_ioctl(struct tty_struct *tty, struct file * file,
479 unsigned int cmd, unsigned long arg)
480{
481 struct hci_uart *hu = (void *)tty->disc_data;
482 int err = 0;
483
484 BT_DBG("");
485
486
487 if (!hu)
488 return -EBADF;
489
490 switch (cmd) {
491 case HCIUARTSETPROTO:
492 if (!test_and_set_bit(HCI_UART_PROTO_SET, &hu->flags)) {
493 err = hci_uart_set_proto(hu, arg);
494 if (err) {
495 clear_bit(HCI_UART_PROTO_SET, &hu->flags);
496 return err;
497 }
498 } else
499 return -EBUSY;
500 break;
501
502 case HCIUARTGETPROTO:
503 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
504 return hu->proto->id;
505 return -EUNATCH;
506
507 case HCIUARTGETDEVICE:
508 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
509 return hu->hdev->id;
510 return -EUNATCH;
511
512 case HCIUARTSETFLAGS:
513 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
514 return -EBUSY;
515 hu->hdev_flags = arg;
516 break;
517
518 case HCIUARTGETFLAGS:
519 return hu->hdev_flags;
520
521 default:
522 err = n_tty_ioctl_helper(tty, file, cmd, arg);
523 break;
524 }
525
526 return err;
527}
528
529
530
531
532static ssize_t hci_uart_tty_read(struct tty_struct *tty, struct file *file,
533 unsigned char __user *buf, size_t nr)
534{
535 return 0;
536}
537
538static ssize_t hci_uart_tty_write(struct tty_struct *tty, struct file *file,
539 const unsigned char *data, size_t count)
540{
541 return 0;
542}
543
544static unsigned int hci_uart_tty_poll(struct tty_struct *tty,
545 struct file *filp, poll_table *wait)
546{
547 return 0;
548}
549
550static int __init hci_uart_init(void)
551{
552 static struct tty_ldisc_ops hci_uart_ldisc;
553 int err;
554
555 BT_INFO("HCI UART driver ver %s", VERSION);
556
557
558
559 memset(&hci_uart_ldisc, 0, sizeof (hci_uart_ldisc));
560 hci_uart_ldisc.magic = TTY_LDISC_MAGIC;
561 hci_uart_ldisc.name = "n_hci";
562 hci_uart_ldisc.open = hci_uart_tty_open;
563 hci_uart_ldisc.close = hci_uart_tty_close;
564 hci_uart_ldisc.read = hci_uart_tty_read;
565 hci_uart_ldisc.write = hci_uart_tty_write;
566 hci_uart_ldisc.ioctl = hci_uart_tty_ioctl;
567 hci_uart_ldisc.poll = hci_uart_tty_poll;
568 hci_uart_ldisc.receive_buf = hci_uart_tty_receive;
569 hci_uart_ldisc.write_wakeup = hci_uart_tty_wakeup;
570 hci_uart_ldisc.owner = THIS_MODULE;
571
572 if ((err = tty_register_ldisc(N_HCI, &hci_uart_ldisc))) {
573 BT_ERR("HCI line discipline registration failed. (%d)", err);
574 return err;
575 }
576
577#ifdef CONFIG_BT_HCIUART_H4
578 h4_init();
579#endif
580#ifdef CONFIG_BT_HCIUART_BCSP
581 bcsp_init();
582#endif
583#ifdef CONFIG_BT_HCIUART_LL
584 ll_init();
585#endif
586#ifdef CONFIG_BT_HCIUART_ATH3K
587 ath_init();
588#endif
589#ifdef CONFIG_BT_HCIUART_3WIRE
590 h5_init();
591#endif
592
593 return 0;
594}
595
596static void __exit hci_uart_exit(void)
597{
598 int err;
599
600#ifdef CONFIG_BT_HCIUART_H4
601 h4_deinit();
602#endif
603#ifdef CONFIG_BT_HCIUART_BCSP
604 bcsp_deinit();
605#endif
606#ifdef CONFIG_BT_HCIUART_LL
607 ll_deinit();
608#endif
609#ifdef CONFIG_BT_HCIUART_ATH3K
610 ath_deinit();
611#endif
612#ifdef CONFIG_BT_HCIUART_3WIRE
613 h5_deinit();
614#endif
615
616
617 if ((err = tty_unregister_ldisc(N_HCI)))
618 BT_ERR("Can't unregister HCI line discipline (%d)", err);
619}
620
621module_init(hci_uart_init);
622module_exit(hci_uart_exit);
623
624MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
625MODULE_DESCRIPTION("Bluetooth HCI UART driver ver " VERSION);
626MODULE_VERSION(VERSION);
627MODULE_LICENSE("GPL");
628MODULE_ALIAS_LDISC(N_HCI);
629