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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 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);
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#include <linux/firmware.h>
44
45#include <net/bluetooth/bluetooth.h>
46#include <net/bluetooth/hci_core.h>
47
48#include "btintel.h"
49#include "btbcm.h"
50#include "hci_uart.h"
51
52#define VERSION "2.3"
53
54static const struct hci_uart_proto *hup[HCI_UART_MAX_PROTO];
55
56int hci_uart_register_proto(const struct hci_uart_proto *p)
57{
58 if (p->id >= HCI_UART_MAX_PROTO)
59 return -EINVAL;
60
61 if (hup[p->id])
62 return -EEXIST;
63
64 hup[p->id] = p;
65
66 BT_INFO("HCI UART protocol %s registered", p->name);
67
68 return 0;
69}
70
71int hci_uart_unregister_proto(const struct hci_uart_proto *p)
72{
73 if (p->id >= HCI_UART_MAX_PROTO)
74 return -EINVAL;
75
76 if (!hup[p->id])
77 return -EINVAL;
78
79 hup[p->id] = NULL;
80
81 return 0;
82}
83
84static const struct hci_uart_proto *hci_uart_get_proto(unsigned int id)
85{
86 if (id >= HCI_UART_MAX_PROTO)
87 return NULL;
88
89 return hup[id];
90}
91
92static inline void hci_uart_tx_complete(struct hci_uart *hu, int pkt_type)
93{
94 struct hci_dev *hdev = hu->hdev;
95
96 /* Update HCI stat counters */
97 switch (pkt_type) {
98 case HCI_COMMAND_PKT:
99 hdev->stat.cmd_tx++;
100 break;
101
102 case HCI_ACLDATA_PKT:
103 hdev->stat.acl_tx++;
104 break;
105
106 case HCI_SCODATA_PKT:
107 hdev->stat.sco_tx++;
108 break;
109 }
110}
111
112static inline struct sk_buff *hci_uart_dequeue(struct hci_uart *hu)
113{
114 struct sk_buff *skb = hu->tx_skb;
115
116 if (!skb)
117 skb = hu->proto->dequeue(hu);
118 else
119 hu->tx_skb = NULL;
120
121 return skb;
122}
123
124int hci_uart_tx_wakeup(struct hci_uart *hu)
125{
126 if (test_and_set_bit(HCI_UART_SENDING, &hu->tx_state)) {
127 set_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
128 return 0;
129 }
130
131 BT_DBG("");
132
133 schedule_work(&hu->write_work);
134
135 return 0;
136}
137
138static void hci_uart_write_work(struct work_struct *work)
139{
140 struct hci_uart *hu = container_of(work, struct hci_uart, write_work);
141 struct tty_struct *tty = hu->tty;
142 struct hci_dev *hdev = hu->hdev;
143 struct sk_buff *skb;
144
145 /* REVISIT: should we cope with bad skbs or ->write() returning
146 * and error value ?
147 */
148
149restart:
150 clear_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
151
152 while ((skb = hci_uart_dequeue(hu))) {
153 int len;
154
155 set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
156 len = tty->ops->write(tty, skb->data, skb->len);
157 hdev->stat.byte_tx += len;
158
159 skb_pull(skb, len);
160 if (skb->len) {
161 hu->tx_skb = skb;
162 break;
163 }
164
165 hci_uart_tx_complete(hu, hci_skb_pkt_type(skb));
166 kfree_skb(skb);
167 }
168
169 if (test_bit(HCI_UART_TX_WAKEUP, &hu->tx_state))
170 goto restart;
171
172 clear_bit(HCI_UART_SENDING, &hu->tx_state);
173}
174
175static void hci_uart_init_work(struct work_struct *work)
176{
177 struct hci_uart *hu = container_of(work, struct hci_uart, init_ready);
178 int err;
179
180 if (!test_and_clear_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
181 return;
182
183 err = hci_register_dev(hu->hdev);
184 if (err < 0) {
185 BT_ERR("Can't register HCI device");
186 hci_free_dev(hu->hdev);
187 hu->hdev = NULL;
188 hu->proto->close(hu);
189 }
190
191 set_bit(HCI_UART_REGISTERED, &hu->flags);
192}
193
194int hci_uart_init_ready(struct hci_uart *hu)
195{
196 if (!test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
197 return -EALREADY;
198
199 schedule_work(&hu->init_ready);
200
201 return 0;
202}
203
204/* ------- Interface to HCI layer ------ */
205/* Initialize device */
206static int hci_uart_open(struct hci_dev *hdev)
207{
208 BT_DBG("%s %p", hdev->name, hdev);
209
210 /* Nothing to do for UART driver */
211 return 0;
212}
213
214/* Reset device */
215static int hci_uart_flush(struct hci_dev *hdev)
216{
217 struct hci_uart *hu = hci_get_drvdata(hdev);
218 struct tty_struct *tty = hu->tty;
219
220 BT_DBG("hdev %p tty %p", hdev, tty);
221
222 if (hu->tx_skb) {
223 kfree_skb(hu->tx_skb); hu->tx_skb = NULL;
224 }
225
226 /* Flush any pending characters in the driver and discipline. */
227 tty_ldisc_flush(tty);
228 tty_driver_flush_buffer(tty);
229
230 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
231 hu->proto->flush(hu);
232
233 return 0;
234}
235
236/* Close device */
237static int hci_uart_close(struct hci_dev *hdev)
238{
239 BT_DBG("hdev %p", hdev);
240
241 hci_uart_flush(hdev);
242 hdev->flush = NULL;
243 return 0;
244}
245
246/* Send frames from HCI layer */
247static int hci_uart_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
248{
249 struct hci_uart *hu = hci_get_drvdata(hdev);
250
251 BT_DBG("%s: type %d len %d", hdev->name, hci_skb_pkt_type(skb),
252 skb->len);
253
254 hu->proto->enqueue(hu, skb);
255
256 hci_uart_tx_wakeup(hu);
257
258 return 0;
259}
260
261/* Flow control or un-flow control the device */
262void hci_uart_set_flow_control(struct hci_uart *hu, bool enable)
263{
264 struct tty_struct *tty = hu->tty;
265 struct ktermios ktermios;
266 int status;
267 unsigned int set = 0;
268 unsigned int clear = 0;
269
270 if (enable) {
271 /* Disable hardware flow control */
272 ktermios = tty->termios;
273 ktermios.c_cflag &= ~CRTSCTS;
274 status = tty_set_termios(tty, &ktermios);
275 BT_DBG("Disabling hardware flow control: %s",
276 status ? "failed" : "success");
277
278 /* Clear RTS to prevent the device from sending */
279 /* Most UARTs need OUT2 to enable interrupts */
280 status = tty->driver->ops->tiocmget(tty);
281 BT_DBG("Current tiocm 0x%x", status);
282
283 set &= ~(TIOCM_OUT2 | TIOCM_RTS);
284 clear = ~set;
285 set &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
286 TIOCM_OUT2 | TIOCM_LOOP;
287 clear &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
288 TIOCM_OUT2 | TIOCM_LOOP;
289 status = tty->driver->ops->tiocmset(tty, set, clear);
290 BT_DBG("Clearing RTS: %s", status ? "failed" : "success");
291 } else {
292 /* Set RTS to allow the device to send again */
293 status = tty->driver->ops->tiocmget(tty);
294 BT_DBG("Current tiocm 0x%x", status);
295
296 set |= (TIOCM_OUT2 | TIOCM_RTS);
297 clear = ~set;
298 set &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
299 TIOCM_OUT2 | TIOCM_LOOP;
300 clear &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
301 TIOCM_OUT2 | TIOCM_LOOP;
302 status = tty->driver->ops->tiocmset(tty, set, clear);
303 BT_DBG("Setting RTS: %s", status ? "failed" : "success");
304
305 /* Re-enable hardware flow control */
306 ktermios = tty->termios;
307 ktermios.c_cflag |= CRTSCTS;
308 status = tty_set_termios(tty, &ktermios);
309 BT_DBG("Enabling hardware flow control: %s",
310 status ? "failed" : "success");
311 }
312}
313
314void hci_uart_set_speeds(struct hci_uart *hu, unsigned int init_speed,
315 unsigned int oper_speed)
316{
317 hu->init_speed = init_speed;
318 hu->oper_speed = oper_speed;
319}
320
321void hci_uart_init_tty(struct hci_uart *hu)
322{
323 struct tty_struct *tty = hu->tty;
324 struct ktermios ktermios;
325
326 /* Bring the UART into a known 8 bits no parity hw fc state */
327 ktermios = tty->termios;
328 ktermios.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP |
329 INLCR | IGNCR | ICRNL | IXON);
330 ktermios.c_oflag &= ~OPOST;
331 ktermios.c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
332 ktermios.c_cflag &= ~(CSIZE | PARENB);
333 ktermios.c_cflag |= CS8;
334 ktermios.c_cflag |= CRTSCTS;
335
336 /* tty_set_termios() return not checked as it is always 0 */
337 tty_set_termios(tty, &ktermios);
338}
339
340void hci_uart_set_baudrate(struct hci_uart *hu, unsigned int speed)
341{
342 struct tty_struct *tty = hu->tty;
343 struct ktermios ktermios;
344
345 ktermios = tty->termios;
346 ktermios.c_cflag &= ~CBAUD;
347 tty_termios_encode_baud_rate(&ktermios, speed, speed);
348
349 /* tty_set_termios() return not checked as it is always 0 */
350 tty_set_termios(tty, &ktermios);
351
352 BT_DBG("%s: New tty speeds: %d/%d", hu->hdev->name,
353 tty->termios.c_ispeed, tty->termios.c_ospeed);
354}
355
356static int hci_uart_setup(struct hci_dev *hdev)
357{
358 struct hci_uart *hu = hci_get_drvdata(hdev);
359 struct hci_rp_read_local_version *ver;
360 struct sk_buff *skb;
361 unsigned int speed;
362 int err;
363
364 /* Init speed if any */
365 if (hu->init_speed)
366 speed = hu->init_speed;
367 else if (hu->proto->init_speed)
368 speed = hu->proto->init_speed;
369 else
370 speed = 0;
371
372 if (speed)
373 hci_uart_set_baudrate(hu, speed);
374
375 /* Operational speed if any */
376 if (hu->oper_speed)
377 speed = hu->oper_speed;
378 else if (hu->proto->oper_speed)
379 speed = hu->proto->oper_speed;
380 else
381 speed = 0;
382
383 if (hu->proto->set_baudrate && speed) {
384 err = hu->proto->set_baudrate(hu, speed);
385 if (!err)
386 hci_uart_set_baudrate(hu, speed);
387 }
388
389 if (hu->proto->setup)
390 return hu->proto->setup(hu);
391
392 if (!test_bit(HCI_UART_VND_DETECT, &hu->hdev_flags))
393 return 0;
394
395 skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_VERSION, 0, NULL,
396 HCI_INIT_TIMEOUT);
397 if (IS_ERR(skb)) {
398 BT_ERR("%s: Reading local version information failed (%ld)",
399 hdev->name, PTR_ERR(skb));
400 return 0;
401 }
402
403 if (skb->len != sizeof(*ver)) {
404 BT_ERR("%s: Event length mismatch for version information",
405 hdev->name);
406 goto done;
407 }
408
409 ver = (struct hci_rp_read_local_version *)skb->data;
410
411 switch (le16_to_cpu(ver->manufacturer)) {
412#ifdef CONFIG_BT_HCIUART_INTEL
413 case 2:
414 hdev->set_bdaddr = btintel_set_bdaddr;
415 btintel_check_bdaddr(hdev);
416 break;
417#endif
418#ifdef CONFIG_BT_HCIUART_BCM
419 case 15:
420 hdev->set_bdaddr = btbcm_set_bdaddr;
421 btbcm_check_bdaddr(hdev);
422 break;
423#endif
424 }
425
426done:
427 kfree_skb(skb);
428 return 0;
429}
430
431/* ------ LDISC part ------ */
432/* hci_uart_tty_open
433 *
434 * Called when line discipline changed to HCI_UART.
435 *
436 * Arguments:
437 * tty pointer to tty info structure
438 * Return Value:
439 * 0 if success, otherwise error code
440 */
441static int hci_uart_tty_open(struct tty_struct *tty)
442{
443 struct hci_uart *hu;
444
445 BT_DBG("tty %p", tty);
446
447 /* Error if the tty has no write op instead of leaving an exploitable
448 hole */
449 if (tty->ops->write == NULL)
450 return -EOPNOTSUPP;
451
452 hu = kzalloc(sizeof(struct hci_uart), GFP_KERNEL);
453 if (!hu) {
454 BT_ERR("Can't allocate control structure");
455 return -ENFILE;
456 }
457
458 tty->disc_data = hu;
459 hu->tty = tty;
460 tty->receive_room = 65536;
461
462 INIT_WORK(&hu->init_ready, hci_uart_init_work);
463 INIT_WORK(&hu->write_work, hci_uart_write_work);
464
465 /* Flush any pending characters in the driver */
466 tty_driver_flush_buffer(tty);
467
468 return 0;
469}
470
471/* hci_uart_tty_close()
472 *
473 * Called when the line discipline is changed to something
474 * else, the tty is closed, or the tty detects a hangup.
475 */
476static void hci_uart_tty_close(struct tty_struct *tty)
477{
478 struct hci_uart *hu = tty->disc_data;
479 struct hci_dev *hdev;
480
481 BT_DBG("tty %p", tty);
482
483 /* Detach from the tty */
484 tty->disc_data = NULL;
485
486 if (!hu)
487 return;
488
489 hdev = hu->hdev;
490 if (hdev)
491 hci_uart_close(hdev);
492
493 cancel_work_sync(&hu->write_work);
494
495 if (test_and_clear_bit(HCI_UART_PROTO_SET, &hu->flags)) {
496 if (hdev) {
497 if (test_bit(HCI_UART_REGISTERED, &hu->flags))
498 hci_unregister_dev(hdev);
499 hci_free_dev(hdev);
500 }
501 hu->proto->close(hu);
502 }
503
504 kfree(hu);
505}
506
507/* hci_uart_tty_wakeup()
508 *
509 * Callback for transmit wakeup. Called when low level
510 * device driver can accept more send data.
511 *
512 * Arguments: tty pointer to associated tty instance data
513 * Return Value: None
514 */
515static void hci_uart_tty_wakeup(struct tty_struct *tty)
516{
517 struct hci_uart *hu = tty->disc_data;
518
519 BT_DBG("");
520
521 if (!hu)
522 return;
523
524 clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
525
526 if (tty != hu->tty)
527 return;
528
529 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
530 hci_uart_tx_wakeup(hu);
531}
532
533/* hci_uart_tty_receive()
534 *
535 * Called by tty low level driver when receive data is
536 * available.
537 *
538 * Arguments: tty pointer to tty isntance data
539 * data pointer to received data
540 * flags pointer to flags for data
541 * count count of received data in bytes
542 *
543 * Return Value: None
544 */
545static void hci_uart_tty_receive(struct tty_struct *tty, const u8 *data,
546 char *flags, int count)
547{
548 struct hci_uart *hu = tty->disc_data;
549
550 if (!hu || tty != hu->tty)
551 return;
552
553 if (!test_bit(HCI_UART_PROTO_SET, &hu->flags))
554 return;
555
556 /* It does not need a lock here as it is already protected by a mutex in
557 * tty caller
558 */
559 hu->proto->recv(hu, data, count);
560
561 if (hu->hdev)
562 hu->hdev->stat.byte_rx += count;
563
564 tty_unthrottle(tty);
565}
566
567static int hci_uart_register_dev(struct hci_uart *hu)
568{
569 struct hci_dev *hdev;
570
571 BT_DBG("");
572
573 /* Initialize and register HCI device */
574 hdev = hci_alloc_dev();
575 if (!hdev) {
576 BT_ERR("Can't allocate HCI device");
577 return -ENOMEM;
578 }
579
580 hu->hdev = hdev;
581
582 hdev->bus = HCI_UART;
583 hci_set_drvdata(hdev, hu);
584
585 /* Only when vendor specific setup callback is provided, consider
586 * the manufacturer information valid. This avoids filling in the
587 * value for Ericsson when nothing is specified.
588 */
589 if (hu->proto->setup)
590 hdev->manufacturer = hu->proto->manufacturer;
591
592 hdev->open = hci_uart_open;
593 hdev->close = hci_uart_close;
594 hdev->flush = hci_uart_flush;
595 hdev->send = hci_uart_send_frame;
596 hdev->setup = hci_uart_setup;
597 SET_HCIDEV_DEV(hdev, hu->tty->dev);
598
599 if (test_bit(HCI_UART_RAW_DEVICE, &hu->hdev_flags))
600 set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks);
601
602 if (test_bit(HCI_UART_EXT_CONFIG, &hu->hdev_flags))
603 set_bit(HCI_QUIRK_EXTERNAL_CONFIG, &hdev->quirks);
604
605 if (!test_bit(HCI_UART_RESET_ON_INIT, &hu->hdev_flags))
606 set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);
607
608 if (test_bit(HCI_UART_CREATE_AMP, &hu->hdev_flags))
609 hdev->dev_type = HCI_AMP;
610 else
611 hdev->dev_type = HCI_BREDR;
612
613 if (test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
614 return 0;
615
616 if (hci_register_dev(hdev) < 0) {
617 BT_ERR("Can't register HCI device");
618 hci_free_dev(hdev);
619 return -ENODEV;
620 }
621
622 set_bit(HCI_UART_REGISTERED, &hu->flags);
623
624 return 0;
625}
626
627static int hci_uart_set_proto(struct hci_uart *hu, int id)
628{
629 const struct hci_uart_proto *p;
630 int err;
631
632 p = hci_uart_get_proto(id);
633 if (!p)
634 return -EPROTONOSUPPORT;
635
636 err = p->open(hu);
637 if (err)
638 return err;
639
640 hu->proto = p;
641
642 err = hci_uart_register_dev(hu);
643 if (err) {
644 p->close(hu);
645 return err;
646 }
647
648 return 0;
649}
650
651static int hci_uart_set_flags(struct hci_uart *hu, unsigned long flags)
652{
653 unsigned long valid_flags = BIT(HCI_UART_RAW_DEVICE) |
654 BIT(HCI_UART_RESET_ON_INIT) |
655 BIT(HCI_UART_CREATE_AMP) |
656 BIT(HCI_UART_INIT_PENDING) |
657 BIT(HCI_UART_EXT_CONFIG) |
658 BIT(HCI_UART_VND_DETECT);
659
660 if (flags & ~valid_flags)
661 return -EINVAL;
662
663 hu->hdev_flags = flags;
664
665 return 0;
666}
667
668/* hci_uart_tty_ioctl()
669 *
670 * Process IOCTL system call for the tty device.
671 *
672 * Arguments:
673 *
674 * tty pointer to tty instance data
675 * file pointer to open file object for device
676 * cmd IOCTL command code
677 * arg argument for IOCTL call (cmd dependent)
678 *
679 * Return Value: Command dependent
680 */
681static int hci_uart_tty_ioctl(struct tty_struct *tty, struct file *file,
682 unsigned int cmd, unsigned long arg)
683{
684 struct hci_uart *hu = tty->disc_data;
685 int err = 0;
686
687 BT_DBG("");
688
689 /* Verify the status of the device */
690 if (!hu)
691 return -EBADF;
692
693 switch (cmd) {
694 case HCIUARTSETPROTO:
695 if (!test_and_set_bit(HCI_UART_PROTO_SET, &hu->flags)) {
696 err = hci_uart_set_proto(hu, arg);
697 if (err) {
698 clear_bit(HCI_UART_PROTO_SET, &hu->flags);
699 return err;
700 }
701 } else
702 return -EBUSY;
703 break;
704
705 case HCIUARTGETPROTO:
706 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
707 return hu->proto->id;
708 return -EUNATCH;
709
710 case HCIUARTGETDEVICE:
711 if (test_bit(HCI_UART_REGISTERED, &hu->flags))
712 return hu->hdev->id;
713 return -EUNATCH;
714
715 case HCIUARTSETFLAGS:
716 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
717 return -EBUSY;
718 err = hci_uart_set_flags(hu, arg);
719 if (err)
720 return err;
721 break;
722
723 case HCIUARTGETFLAGS:
724 return hu->hdev_flags;
725
726 default:
727 err = n_tty_ioctl_helper(tty, file, cmd, arg);
728 break;
729 }
730
731 return err;
732}
733
734/*
735 * We don't provide read/write/poll interface for user space.
736 */
737static ssize_t hci_uart_tty_read(struct tty_struct *tty, struct file *file,
738 unsigned char __user *buf, size_t nr)
739{
740 return 0;
741}
742
743static ssize_t hci_uart_tty_write(struct tty_struct *tty, struct file *file,
744 const unsigned char *data, size_t count)
745{
746 return 0;
747}
748
749static unsigned int hci_uart_tty_poll(struct tty_struct *tty,
750 struct file *filp, poll_table *wait)
751{
752 return 0;
753}
754
755static int __init hci_uart_init(void)
756{
757 static struct tty_ldisc_ops hci_uart_ldisc;
758 int err;
759
760 BT_INFO("HCI UART driver ver %s", VERSION);
761
762 /* Register the tty discipline */
763
764 memset(&hci_uart_ldisc, 0, sizeof(hci_uart_ldisc));
765 hci_uart_ldisc.magic = TTY_LDISC_MAGIC;
766 hci_uart_ldisc.name = "n_hci";
767 hci_uart_ldisc.open = hci_uart_tty_open;
768 hci_uart_ldisc.close = hci_uart_tty_close;
769 hci_uart_ldisc.read = hci_uart_tty_read;
770 hci_uart_ldisc.write = hci_uart_tty_write;
771 hci_uart_ldisc.ioctl = hci_uart_tty_ioctl;
772 hci_uart_ldisc.poll = hci_uart_tty_poll;
773 hci_uart_ldisc.receive_buf = hci_uart_tty_receive;
774 hci_uart_ldisc.write_wakeup = hci_uart_tty_wakeup;
775 hci_uart_ldisc.owner = THIS_MODULE;
776
777 err = tty_register_ldisc(N_HCI, &hci_uart_ldisc);
778 if (err) {
779 BT_ERR("HCI line discipline registration failed. (%d)", err);
780 return err;
781 }
782
783#ifdef CONFIG_BT_HCIUART_H4
784 h4_init();
785#endif
786#ifdef CONFIG_BT_HCIUART_BCSP
787 bcsp_init();
788#endif
789#ifdef CONFIG_BT_HCIUART_LL
790 ll_init();
791#endif
792#ifdef CONFIG_BT_HCIUART_ATH3K
793 ath_init();
794#endif
795#ifdef CONFIG_BT_HCIUART_3WIRE
796 h5_init();
797#endif
798#ifdef CONFIG_BT_HCIUART_INTEL
799 intel_init();
800#endif
801#ifdef CONFIG_BT_HCIUART_BCM
802 bcm_init();
803#endif
804#ifdef CONFIG_BT_HCIUART_QCA
805 qca_init();
806#endif
807#ifdef CONFIG_BT_HCIUART_AG6XX
808 ag6xx_init();
809#endif
810
811 return 0;
812}
813
814static void __exit hci_uart_exit(void)
815{
816 int err;
817
818#ifdef CONFIG_BT_HCIUART_H4
819 h4_deinit();
820#endif
821#ifdef CONFIG_BT_HCIUART_BCSP
822 bcsp_deinit();
823#endif
824#ifdef CONFIG_BT_HCIUART_LL
825 ll_deinit();
826#endif
827#ifdef CONFIG_BT_HCIUART_ATH3K
828 ath_deinit();
829#endif
830#ifdef CONFIG_BT_HCIUART_3WIRE
831 h5_deinit();
832#endif
833#ifdef CONFIG_BT_HCIUART_INTEL
834 intel_deinit();
835#endif
836#ifdef CONFIG_BT_HCIUART_BCM
837 bcm_deinit();
838#endif
839#ifdef CONFIG_BT_HCIUART_QCA
840 qca_deinit();
841#endif
842#ifdef CONFIG_BT_HCIUART_AG6XX
843 ag6xx_deinit();
844#endif
845
846 /* Release tty registration of line discipline */
847 err = tty_unregister_ldisc(N_HCI);
848 if (err)
849 BT_ERR("Can't unregister HCI line discipline (%d)", err);
850}
851
852module_init(hci_uart_init);
853module_exit(hci_uart_exit);
854
855MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
856MODULE_DESCRIPTION("Bluetooth HCI UART driver ver " VERSION);
857MODULE_VERSION(VERSION);
858MODULE_LICENSE("GPL");
859MODULE_ALIAS_LDISC(N_HCI);