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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 "btintel.h"
48#include "btbcm.h"
49#include "hci_uart.h"
50
51#define VERSION "2.3"
52
53static const struct hci_uart_proto *hup[HCI_UART_MAX_PROTO];
54
55int hci_uart_register_proto(const 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 BT_INFO("HCI UART protocol %s registered", p->name);
66
67 return 0;
68}
69
70int hci_uart_unregister_proto(const struct hci_uart_proto *p)
71{
72 if (p->id >= HCI_UART_MAX_PROTO)
73 return -EINVAL;
74
75 if (!hup[p->id])
76 return -EINVAL;
77
78 hup[p->id] = NULL;
79
80 return 0;
81}
82
83static const struct hci_uart_proto *hci_uart_get_proto(unsigned int id)
84{
85 if (id >= HCI_UART_MAX_PROTO)
86 return NULL;
87
88 return hup[id];
89}
90
91static inline void hci_uart_tx_complete(struct hci_uart *hu, int pkt_type)
92{
93 struct hci_dev *hdev = hu->hdev;
94
95
96 switch (pkt_type) {
97 case HCI_COMMAND_PKT:
98 hdev->stat.cmd_tx++;
99 break;
100
101 case HCI_ACLDATA_PKT:
102 hdev->stat.acl_tx++;
103 break;
104
105 case HCI_SCODATA_PKT:
106 hdev->stat.sco_tx++;
107 break;
108 }
109}
110
111static inline struct sk_buff *hci_uart_dequeue(struct hci_uart *hu)
112{
113 struct sk_buff *skb = hu->tx_skb;
114
115 if (!skb)
116 skb = hu->proto->dequeue(hu);
117 else
118 hu->tx_skb = NULL;
119
120 return skb;
121}
122
123int hci_uart_tx_wakeup(struct hci_uart *hu)
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
132 schedule_work(&hu->write_work);
133
134 return 0;
135}
136
137static void hci_uart_write_work(struct work_struct *work)
138{
139 struct hci_uart *hu = container_of(work, struct hci_uart, write_work);
140 struct tty_struct *tty = hu->tty;
141 struct hci_dev *hdev = hu->hdev;
142 struct sk_buff *skb;
143
144
145
146
147
148restart:
149 clear_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
150
151 while ((skb = hci_uart_dequeue(hu))) {
152 int len;
153
154 set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
155 len = tty->ops->write(tty, skb->data, skb->len);
156 hdev->stat.byte_tx += len;
157
158 skb_pull(skb, len);
159 if (skb->len) {
160 hu->tx_skb = skb;
161 break;
162 }
163
164 hci_uart_tx_complete(hu, bt_cb(skb)->pkt_type);
165 kfree_skb(skb);
166 }
167
168 if (test_bit(HCI_UART_TX_WAKEUP, &hu->tx_state))
169 goto restart;
170
171 clear_bit(HCI_UART_SENDING, &hu->tx_state);
172}
173
174static void hci_uart_init_work(struct work_struct *work)
175{
176 struct hci_uart *hu = container_of(work, struct hci_uart, init_ready);
177 int err;
178
179 if (!test_and_clear_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
180 return;
181
182 err = hci_register_dev(hu->hdev);
183 if (err < 0) {
184 BT_ERR("Can't register HCI device");
185 hci_free_dev(hu->hdev);
186 hu->hdev = NULL;
187 hu->proto->close(hu);
188 }
189
190 set_bit(HCI_UART_REGISTERED, &hu->flags);
191}
192
193int hci_uart_init_ready(struct hci_uart *hu)
194{
195 if (!test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
196 return -EALREADY;
197
198 schedule_work(&hu->init_ready);
199
200 return 0;
201}
202
203
204
205static int hci_uart_open(struct hci_dev *hdev)
206{
207 BT_DBG("%s %p", hdev->name, hdev);
208
209
210
211 set_bit(HCI_RUNNING, &hdev->flags);
212
213 return 0;
214}
215
216
217static int hci_uart_flush(struct hci_dev *hdev)
218{
219 struct hci_uart *hu = hci_get_drvdata(hdev);
220 struct tty_struct *tty = hu->tty;
221
222 BT_DBG("hdev %p tty %p", hdev, tty);
223
224 if (hu->tx_skb) {
225 kfree_skb(hu->tx_skb); hu->tx_skb = NULL;
226 }
227
228
229 tty_ldisc_flush(tty);
230 tty_driver_flush_buffer(tty);
231
232 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
233 hu->proto->flush(hu);
234
235 return 0;
236}
237
238
239static int hci_uart_close(struct hci_dev *hdev)
240{
241 BT_DBG("hdev %p", hdev);
242
243 if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
244 return 0;
245
246 hci_uart_flush(hdev);
247 hdev->flush = NULL;
248 return 0;
249}
250
251
252static int hci_uart_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
253{
254 struct hci_uart *hu = hci_get_drvdata(hdev);
255
256 if (!test_bit(HCI_RUNNING, &hdev->flags))
257 return -EBUSY;
258
259 BT_DBG("%s: type %d len %d", hdev->name, bt_cb(skb)->pkt_type, skb->len);
260
261 hu->proto->enqueue(hu, skb);
262
263 hci_uart_tx_wakeup(hu);
264
265 return 0;
266}
267
268static int hci_uart_setup(struct hci_dev *hdev)
269{
270 struct hci_uart *hu = hci_get_drvdata(hdev);
271 struct hci_rp_read_local_version *ver;
272 struct sk_buff *skb;
273
274 if (hu->proto->setup)
275 return hu->proto->setup(hu);
276
277 if (!test_bit(HCI_UART_VND_DETECT, &hu->hdev_flags))
278 return 0;
279
280 skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_VERSION, 0, NULL,
281 HCI_INIT_TIMEOUT);
282 if (IS_ERR(skb)) {
283 BT_ERR("%s: Reading local version information failed (%ld)",
284 hdev->name, PTR_ERR(skb));
285 return 0;
286 }
287
288 if (skb->len != sizeof(*ver)) {
289 BT_ERR("%s: Event length mismatch for version information",
290 hdev->name);
291 goto done;
292 }
293
294 ver = (struct hci_rp_read_local_version *)skb->data;
295
296 switch (le16_to_cpu(ver->manufacturer)) {
297#ifdef CONFIG_BT_HCIUART_INTEL
298 case 2:
299 hdev->set_bdaddr = btintel_set_bdaddr;
300 btintel_check_bdaddr(hdev);
301 break;
302#endif
303#ifdef CONFIG_BT_HCIUART_BCM
304 case 15:
305 hdev->set_bdaddr = btbcm_set_bdaddr;
306 btbcm_check_bdaddr(hdev);
307 break;
308#endif
309 }
310
311done:
312 kfree_skb(skb);
313 return 0;
314}
315
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323
324
325
326static int hci_uart_tty_open(struct tty_struct *tty)
327{
328 struct hci_uart *hu;
329
330 BT_DBG("tty %p", tty);
331
332
333
334 if (tty->ops->write == NULL)
335 return -EOPNOTSUPP;
336
337 hu = kzalloc(sizeof(struct hci_uart), GFP_KERNEL);
338 if (!hu) {
339 BT_ERR("Can't allocate control structure");
340 return -ENFILE;
341 }
342
343 tty->disc_data = hu;
344 hu->tty = tty;
345 tty->receive_room = 65536;
346
347 INIT_WORK(&hu->init_ready, hci_uart_init_work);
348 INIT_WORK(&hu->write_work, hci_uart_write_work);
349
350 spin_lock_init(&hu->rx_lock);
351
352
353
354
355
356
357 if (tty->ldisc->ops->flush_buffer)
358 tty->ldisc->ops->flush_buffer(tty);
359 tty_driver_flush_buffer(tty);
360
361 return 0;
362}
363
364
365
366
367
368
369static void hci_uart_tty_close(struct tty_struct *tty)
370{
371 struct hci_uart *hu = tty->disc_data;
372 struct hci_dev *hdev;
373
374 BT_DBG("tty %p", tty);
375
376
377 tty->disc_data = NULL;
378
379 if (!hu)
380 return;
381
382 hdev = hu->hdev;
383 if (hdev)
384 hci_uart_close(hdev);
385
386 cancel_work_sync(&hu->write_work);
387
388 if (test_and_clear_bit(HCI_UART_PROTO_SET, &hu->flags)) {
389 if (hdev) {
390 if (test_bit(HCI_UART_REGISTERED, &hu->flags))
391 hci_unregister_dev(hdev);
392 hci_free_dev(hdev);
393 }
394 hu->proto->close(hu);
395 }
396
397 kfree(hu);
398}
399
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406
407
408static void hci_uart_tty_wakeup(struct tty_struct *tty)
409{
410 struct hci_uart *hu = tty->disc_data;
411
412 BT_DBG("");
413
414 if (!hu)
415 return;
416
417 clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
418
419 if (tty != hu->tty)
420 return;
421
422 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
423 hci_uart_tx_wakeup(hu);
424}
425
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435
436
437
438static void hci_uart_tty_receive(struct tty_struct *tty, const u8 *data,
439 char *flags, int count)
440{
441 struct hci_uart *hu = tty->disc_data;
442
443 if (!hu || tty != hu->tty)
444 return;
445
446 if (!test_bit(HCI_UART_PROTO_SET, &hu->flags))
447 return;
448
449 spin_lock(&hu->rx_lock);
450 hu->proto->recv(hu, data, count);
451
452 if (hu->hdev)
453 hu->hdev->stat.byte_rx += count;
454
455 spin_unlock(&hu->rx_lock);
456
457 tty_unthrottle(tty);
458}
459
460static int hci_uart_register_dev(struct hci_uart *hu)
461{
462 struct hci_dev *hdev;
463
464 BT_DBG("");
465
466
467 hdev = hci_alloc_dev();
468 if (!hdev) {
469 BT_ERR("Can't allocate HCI device");
470 return -ENOMEM;
471 }
472
473 hu->hdev = hdev;
474
475 hdev->bus = HCI_UART;
476 hci_set_drvdata(hdev, hu);
477
478 hdev->open = hci_uart_open;
479 hdev->close = hci_uart_close;
480 hdev->flush = hci_uart_flush;
481 hdev->send = hci_uart_send_frame;
482 hdev->setup = hci_uart_setup;
483 SET_HCIDEV_DEV(hdev, hu->tty->dev);
484
485 if (test_bit(HCI_UART_RAW_DEVICE, &hu->hdev_flags))
486 set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks);
487
488 if (test_bit(HCI_UART_EXT_CONFIG, &hu->hdev_flags))
489 set_bit(HCI_QUIRK_EXTERNAL_CONFIG, &hdev->quirks);
490
491 if (!test_bit(HCI_UART_RESET_ON_INIT, &hu->hdev_flags))
492 set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);
493
494 if (test_bit(HCI_UART_CREATE_AMP, &hu->hdev_flags))
495 hdev->dev_type = HCI_AMP;
496 else
497 hdev->dev_type = HCI_BREDR;
498
499 if (test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
500 return 0;
501
502 if (hci_register_dev(hdev) < 0) {
503 BT_ERR("Can't register HCI device");
504 hci_free_dev(hdev);
505 return -ENODEV;
506 }
507
508 set_bit(HCI_UART_REGISTERED, &hu->flags);
509
510 return 0;
511}
512
513static int hci_uart_set_proto(struct hci_uart *hu, int id)
514{
515 const struct hci_uart_proto *p;
516 int err;
517
518 p = hci_uart_get_proto(id);
519 if (!p)
520 return -EPROTONOSUPPORT;
521
522 err = p->open(hu);
523 if (err)
524 return err;
525
526 hu->proto = p;
527
528 err = hci_uart_register_dev(hu);
529 if (err) {
530 p->close(hu);
531 return err;
532 }
533
534 return 0;
535}
536
537static int hci_uart_set_flags(struct hci_uart *hu, unsigned long flags)
538{
539 unsigned long valid_flags = BIT(HCI_UART_RAW_DEVICE) |
540 BIT(HCI_UART_RESET_ON_INIT) |
541 BIT(HCI_UART_CREATE_AMP) |
542 BIT(HCI_UART_INIT_PENDING) |
543 BIT(HCI_UART_EXT_CONFIG) |
544 BIT(HCI_UART_VND_DETECT);
545
546 if (flags & ~valid_flags)
547 return -EINVAL;
548
549 hu->hdev_flags = flags;
550
551 return 0;
552}
553
554
555
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561
562
563
564
565
566
567static int hci_uart_tty_ioctl(struct tty_struct *tty, struct file *file,
568 unsigned int cmd, unsigned long arg)
569{
570 struct hci_uart *hu = tty->disc_data;
571 int err = 0;
572
573 BT_DBG("");
574
575
576 if (!hu)
577 return -EBADF;
578
579 switch (cmd) {
580 case HCIUARTSETPROTO:
581 if (!test_and_set_bit(HCI_UART_PROTO_SET, &hu->flags)) {
582 err = hci_uart_set_proto(hu, arg);
583 if (err) {
584 clear_bit(HCI_UART_PROTO_SET, &hu->flags);
585 return err;
586 }
587 } else
588 return -EBUSY;
589 break;
590
591 case HCIUARTGETPROTO:
592 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
593 return hu->proto->id;
594 return -EUNATCH;
595
596 case HCIUARTGETDEVICE:
597 if (test_bit(HCI_UART_REGISTERED, &hu->flags))
598 return hu->hdev->id;
599 return -EUNATCH;
600
601 case HCIUARTSETFLAGS:
602 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
603 return -EBUSY;
604 err = hci_uart_set_flags(hu, arg);
605 if (err)
606 return err;
607 break;
608
609 case HCIUARTGETFLAGS:
610 return hu->hdev_flags;
611
612 default:
613 err = n_tty_ioctl_helper(tty, file, cmd, arg);
614 break;
615 }
616
617 return err;
618}
619
620
621
622
623static ssize_t hci_uart_tty_read(struct tty_struct *tty, struct file *file,
624 unsigned char __user *buf, size_t nr)
625{
626 return 0;
627}
628
629static ssize_t hci_uart_tty_write(struct tty_struct *tty, struct file *file,
630 const unsigned char *data, size_t count)
631{
632 return 0;
633}
634
635static unsigned int hci_uart_tty_poll(struct tty_struct *tty,
636 struct file *filp, poll_table *wait)
637{
638 return 0;
639}
640
641static int __init hci_uart_init(void)
642{
643 static struct tty_ldisc_ops hci_uart_ldisc;
644 int err;
645
646 BT_INFO("HCI UART driver ver %s", VERSION);
647
648
649
650 memset(&hci_uart_ldisc, 0, sizeof (hci_uart_ldisc));
651 hci_uart_ldisc.magic = TTY_LDISC_MAGIC;
652 hci_uart_ldisc.name = "n_hci";
653 hci_uart_ldisc.open = hci_uart_tty_open;
654 hci_uart_ldisc.close = hci_uart_tty_close;
655 hci_uart_ldisc.read = hci_uart_tty_read;
656 hci_uart_ldisc.write = hci_uart_tty_write;
657 hci_uart_ldisc.ioctl = hci_uart_tty_ioctl;
658 hci_uart_ldisc.poll = hci_uart_tty_poll;
659 hci_uart_ldisc.receive_buf = hci_uart_tty_receive;
660 hci_uart_ldisc.write_wakeup = hci_uart_tty_wakeup;
661 hci_uart_ldisc.owner = THIS_MODULE;
662
663 err = tty_register_ldisc(N_HCI, &hci_uart_ldisc);
664 if (err) {
665 BT_ERR("HCI line discipline registration failed. (%d)", err);
666 return err;
667 }
668
669#ifdef CONFIG_BT_HCIUART_H4
670 h4_init();
671#endif
672#ifdef CONFIG_BT_HCIUART_BCSP
673 bcsp_init();
674#endif
675#ifdef CONFIG_BT_HCIUART_LL
676 ll_init();
677#endif
678#ifdef CONFIG_BT_HCIUART_ATH3K
679 ath_init();
680#endif
681#ifdef CONFIG_BT_HCIUART_3WIRE
682 h5_init();
683#endif
684#ifdef CONFIG_BT_HCIUART_BCM
685 bcm_init();
686#endif
687
688 return 0;
689}
690
691static void __exit hci_uart_exit(void)
692{
693 int err;
694
695#ifdef CONFIG_BT_HCIUART_H4
696 h4_deinit();
697#endif
698#ifdef CONFIG_BT_HCIUART_BCSP
699 bcsp_deinit();
700#endif
701#ifdef CONFIG_BT_HCIUART_LL
702 ll_deinit();
703#endif
704#ifdef CONFIG_BT_HCIUART_ATH3K
705 ath_deinit();
706#endif
707#ifdef CONFIG_BT_HCIUART_3WIRE
708 h5_deinit();
709#endif
710#ifdef CONFIG_BT_HCIUART_BCM
711 bcm_deinit();
712#endif
713
714
715 err = tty_unregister_ldisc(N_HCI);
716 if (err)
717 BT_ERR("Can't unregister HCI line discipline (%d)", err);
718}
719
720module_init(hci_uart_init);
721module_exit(hci_uart_exit);
722
723MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
724MODULE_DESCRIPTION("Bluetooth HCI UART driver ver " VERSION);
725MODULE_VERSION(VERSION);
726MODULE_LICENSE("GPL");
727MODULE_ALIAS_LDISC(N_HCI);
728
