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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
Marcel Holtmann0372a662005-10-28 19:20:45 +020049#define VERSION "2.2"
50
Linus Torvalds1da177e2005-04-16 15:20:36 -070051static 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;
Marcel Holtmann0372a662005-10-28 19:20:45 +020062
Linus Torvalds1da177e2005-04-16 15:20:36 -070063 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;
Marcel Holtmann0372a662005-10-28 19:20:45 +020075
Linus Torvalds1da177e2005-04-16 15:20:36 -070076 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;
Marcel Holtmann0372a662005-10-28 19:20:45 +020083
Linus Torvalds1da177e2005-04-16 15:20:36 -070084 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;
Marcel Holtmann0372a662005-10-28 19:20:45 +020090
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 /* 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:
Karl Beldan7f8f2722010-10-07 21:57:10 +0200102 hdev->stat.sco_tx++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 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;
Marcel Holtmann0372a662005-10-28 19:20:45 +0200110
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 if (!skb)
112 skb = hu->proto->dequeue(hu);
113 else
114 hu->tx_skb = NULL;
Marcel Holtmann0372a662005-10-28 19:20:45 +0200115
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 return skb;
117}
118
119int hci_uart_tx_wakeup(struct hci_uart *hu)
120{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 if (test_and_set_bit(HCI_UART_SENDING, &hu->tx_state)) {
122 set_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
123 return 0;
124 }
125
126 BT_DBG("");
127
Felipe Balbida64c272014-04-23 09:58:26 -0500128 schedule_work(&hu->write_work);
129
130 return 0;
131}
132
133static void hci_uart_write_work(struct work_struct *work)
134{
135 struct hci_uart *hu = container_of(work, struct hci_uart, write_work);
136 struct tty_struct *tty = hu->tty;
137 struct hci_dev *hdev = hu->hdev;
138 struct sk_buff *skb;
139
140 /* REVISIT: should we cope with bad skbs or ->write() returning
141 * and error value ?
142 */
143
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144restart:
145 clear_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
146
147 while ((skb = hci_uart_dequeue(hu))) {
148 int len;
Marcel Holtmann0372a662005-10-28 19:20:45 +0200149
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
Alan Coxf34d7a52008-04-30 00:54:13 -0700151 len = tty->ops->write(tty, skb->data, skb->len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152 hdev->stat.byte_tx += len;
153
154 skb_pull(skb, len);
155 if (skb->len) {
156 hu->tx_skb = skb;
157 break;
158 }
Marcel Holtmann0372a662005-10-28 19:20:45 +0200159
Marcel Holtmann0d48d932005-08-09 20:30:28 -0700160 hci_uart_tx_complete(hu, bt_cb(skb)->pkt_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 kfree_skb(skb);
Marcel Holtmann0372a662005-10-28 19:20:45 +0200162 }
163
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 if (test_bit(HCI_UART_TX_WAKEUP, &hu->tx_state))
165 goto restart;
166
167 clear_bit(HCI_UART_SENDING, &hu->tx_state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168}
169
Johan Hedberg9f2aee82012-07-16 16:12:11 +0300170static void hci_uart_init_work(struct work_struct *work)
171{
172 struct hci_uart *hu = container_of(work, struct hci_uart, init_ready);
173 int err;
174
175 if (!test_and_clear_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
176 return;
177
178 err = hci_register_dev(hu->hdev);
179 if (err < 0) {
180 BT_ERR("Can't register HCI device");
181 hci_free_dev(hu->hdev);
182 hu->hdev = NULL;
183 hu->proto->close(hu);
184 }
185
186 set_bit(HCI_UART_REGISTERED, &hu->flags);
187}
188
189int hci_uart_init_ready(struct hci_uart *hu)
190{
191 if (!test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
192 return -EALREADY;
193
194 schedule_work(&hu->init_ready);
195
196 return 0;
197}
198
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199/* ------- Interface to HCI layer ------ */
200/* Initialize device */
201static int hci_uart_open(struct hci_dev *hdev)
202{
203 BT_DBG("%s %p", hdev->name, hdev);
204
205 /* Nothing to do for UART driver */
206
207 set_bit(HCI_RUNNING, &hdev->flags);
Marcel Holtmann0372a662005-10-28 19:20:45 +0200208
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 return 0;
210}
211
212/* Reset device */
213static int hci_uart_flush(struct hci_dev *hdev)
214{
David Herrmann155961e2012-02-09 21:58:32 +0100215 struct hci_uart *hu = hci_get_drvdata(hdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216 struct tty_struct *tty = hu->tty;
217
218 BT_DBG("hdev %p tty %p", hdev, tty);
219
220 if (hu->tx_skb) {
221 kfree_skb(hu->tx_skb); hu->tx_skb = NULL;
222 }
223
224 /* Flush any pending characters in the driver and discipline. */
225 tty_ldisc_flush(tty);
Alan Coxf34d7a52008-04-30 00:54:13 -0700226 tty_driver_flush_buffer(tty);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227
228 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
229 hu->proto->flush(hu);
230
231 return 0;
232}
233
234/* Close device */
235static int hci_uart_close(struct hci_dev *hdev)
236{
237 BT_DBG("hdev %p", hdev);
238
239 if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
240 return 0;
241
242 hci_uart_flush(hdev);
David Newall3611f4d2008-02-11 21:41:30 -0800243 hdev->flush = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244 return 0;
245}
246
247/* Send frames from HCI layer */
Marcel Holtmann7bd8f092013-10-11 06:19:18 -0700248static int hci_uart_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249{
Marcel Holtmann52bc4232013-10-11 07:01:03 -0700250 struct hci_uart *hu = hci_get_drvdata(hdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251
252 if (!test_bit(HCI_RUNNING, &hdev->flags))
253 return -EBUSY;
254
Marcel Holtmann0d48d932005-08-09 20:30:28 -0700255 BT_DBG("%s: type %d len %d", hdev->name, bt_cb(skb)->pkt_type, skb->len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256
257 hu->proto->enqueue(hu, skb);
258
259 hci_uart_tx_wakeup(hu);
Marcel Holtmann0372a662005-10-28 19:20:45 +0200260
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261 return 0;
262}
263
Loic Poulaineb173802015-03-25 15:19:30 +0100264static int hci_uart_setup(struct hci_dev *hdev)
265{
266 struct hci_uart *hu = hci_get_drvdata(hdev);
Marcel Holtmannfb2ce8d2015-04-04 16:13:01 -0700267 struct hci_rp_read_local_version *ver;
268 struct sk_buff *skb;
Loic Poulaineb173802015-03-25 15:19:30 +0100269
270 if (hu->proto->setup)
271 return hu->proto->setup(hu);
272
Marcel Holtmannfb2ce8d2015-04-04 16:13:01 -0700273 if (!test_bit(HCI_UART_VND_DETECT, &hu->hdev_flags))
274 return 0;
275
276 skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_VERSION, 0, NULL,
277 HCI_INIT_TIMEOUT);
278 if (IS_ERR(skb)) {
279 BT_ERR("%s: Reading local version information failed (%ld)",
280 hdev->name, PTR_ERR(skb));
281 return 0;
282 }
283
284 if (skb->len != sizeof(*ver)) {
285 BT_ERR("%s: Event length mismatch for version information",
286 hdev->name);
287 goto done;
288 }
289
290 ver = (struct hci_rp_read_local_version *)skb->data;
291
292 switch (le16_to_cpu(ver->manufacturer)) {
Marcel Holtmann16e38872015-04-04 16:13:02 -0700293#ifdef CONFIG_BT_HCIUART_INTEL
294 case 2:
295 hdev->set_bdaddr = intel_set_bdaddr;
296 break;
297#endif
Marcel Holtmanne9a2dd22015-04-04 16:13:03 -0700298#ifdef CONFIG_BT_HCIUART_BCM
299 case 15:
300 hdev->set_bdaddr = bcm_set_bdaddr;
301 break;
302#endif
Marcel Holtmannfb2ce8d2015-04-04 16:13:01 -0700303 }
304
305done:
306 kfree_skb(skb);
Loic Poulaineb173802015-03-25 15:19:30 +0100307 return 0;
308}
309
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310/* ------ LDISC part ------ */
311/* hci_uart_tty_open
Chan-yeol Park1687dfc2013-04-02 21:24:23 +0900312 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 * Called when line discipline changed to HCI_UART.
314 *
315 * Arguments:
316 * tty pointer to tty info structure
Chan-yeol Park1687dfc2013-04-02 21:24:23 +0900317 * Return Value:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318 * 0 if success, otherwise error code
319 */
320static int hci_uart_tty_open(struct tty_struct *tty)
321{
Jiri Slabyf327b342012-10-18 22:26:34 +0200322 struct hci_uart *hu;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323
324 BT_DBG("tty %p", tty);
325
Alan Coxc19483c2010-10-22 14:11:26 +0100326 /* Error if the tty has no write op instead of leaving an exploitable
327 hole */
328 if (tty->ops->write == NULL)
329 return -EOPNOTSUPP;
330
Valentin Iliea08b15e2013-08-12 18:46:00 +0300331 hu = kzalloc(sizeof(struct hci_uart), GFP_KERNEL);
332 if (!hu) {
Marcel Holtmann77851622006-09-21 16:23:19 +0200333 BT_ERR("Can't allocate control structure");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 return -ENFILE;
335 }
Marcel Holtmann0372a662005-10-28 19:20:45 +0200336
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 tty->disc_data = hu;
338 hu->tty = tty;
Alan Cox33f0f882006-01-09 20:54:13 -0800339 tty->receive_room = 65536;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340
Johan Hedberg9f2aee82012-07-16 16:12:11 +0300341 INIT_WORK(&hu->init_ready, hci_uart_init_work);
Felipe Balbida64c272014-04-23 09:58:26 -0500342 INIT_WORK(&hu->write_work, hci_uart_write_work);
Johan Hedberg9f2aee82012-07-16 16:12:11 +0300343
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 spin_lock_init(&hu->rx_lock);
345
346 /* Flush any pending characters in the driver and line discipline. */
Marcel Holtmann0372a662005-10-28 19:20:45 +0200347
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348 /* FIXME: why is this needed. Note don't use ldisc_ref here as the
349 open path is before the ldisc is referencable */
Marcel Holtmann0372a662005-10-28 19:20:45 +0200350
Alan Coxc65c9bc2009-06-11 12:50:12 +0100351 if (tty->ldisc->ops->flush_buffer)
352 tty->ldisc->ops->flush_buffer(tty);
Alan Coxf34d7a52008-04-30 00:54:13 -0700353 tty_driver_flush_buffer(tty);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354
355 return 0;
356}
357
358/* hci_uart_tty_close()
359 *
360 * Called when the line discipline is changed to something
361 * else, the tty is closed, or the tty detects a hangup.
362 */
363static void hci_uart_tty_close(struct tty_struct *tty)
364{
Marcel Holtmanndfe19d22015-04-04 19:57:21 -0700365 struct hci_uart *hu = tty->disc_data;
Johan Hedbergdac670b2012-07-16 16:12:10 +0300366 struct hci_dev *hdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367
368 BT_DBG("tty %p", tty);
369
370 /* Detach from the tty */
371 tty->disc_data = NULL;
372
Johan Hedbergdac670b2012-07-16 16:12:10 +0300373 if (!hu)
374 return;
Marcel Holtmann22ad4202007-05-09 09:15:40 +0200375
Johan Hedbergdac670b2012-07-16 16:12:10 +0300376 hdev = hu->hdev;
377 if (hdev)
378 hci_uart_close(hdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379
Felipe Balbida64c272014-04-23 09:58:26 -0500380 cancel_work_sync(&hu->write_work);
381
Johan Hedbergdac670b2012-07-16 16:12:10 +0300382 if (test_and_clear_bit(HCI_UART_PROTO_SET, &hu->flags)) {
383 if (hdev) {
Johan Hedberg9f2aee82012-07-16 16:12:11 +0300384 if (test_bit(HCI_UART_REGISTERED, &hu->flags))
385 hci_unregister_dev(hdev);
Johan Hedbergdac670b2012-07-16 16:12:10 +0300386 hci_free_dev(hdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387 }
Johan Hedbergdac670b2012-07-16 16:12:10 +0300388 hu->proto->close(hu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389 }
Johan Hedbergdac670b2012-07-16 16:12:10 +0300390
391 kfree(hu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392}
393
394/* hci_uart_tty_wakeup()
395 *
396 * Callback for transmit wakeup. Called when low level
397 * device driver can accept more send data.
398 *
399 * Arguments: tty pointer to associated tty instance data
400 * Return Value: None
401 */
402static void hci_uart_tty_wakeup(struct tty_struct *tty)
403{
Marcel Holtmanndfe19d22015-04-04 19:57:21 -0700404 struct hci_uart *hu = tty->disc_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405
406 BT_DBG("");
407
408 if (!hu)
409 return;
410
411 clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
412
413 if (tty != hu->tty)
414 return;
415
416 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
417 hci_uart_tx_wakeup(hu);
418}
419
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420/* hci_uart_tty_receive()
Chan-yeol Park1687dfc2013-04-02 21:24:23 +0900421 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422 * Called by tty low level driver when receive data is
423 * available.
Chan-yeol Park1687dfc2013-04-02 21:24:23 +0900424 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425 * Arguments: tty pointer to tty isntance data
426 * data pointer to received data
427 * flags pointer to flags for data
428 * count count of received data in bytes
Chan-yeol Park1687dfc2013-04-02 21:24:23 +0900429 *
Linus Torvalds55db4c62011-06-04 06:33:24 +0900430 * Return Value: None
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 */
Marcel Holtmannfacf5222015-04-04 19:57:22 -0700432static void hci_uart_tty_receive(struct tty_struct *tty, const u8 *data,
433 char *flags, int count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434{
Marcel Holtmanndfe19d22015-04-04 19:57:21 -0700435 struct hci_uart *hu = tty->disc_data;
Marcel Holtmann0372a662005-10-28 19:20:45 +0200436
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 if (!hu || tty != hu->tty)
Linus Torvalds55db4c62011-06-04 06:33:24 +0900438 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439
440 if (!test_bit(HCI_UART_PROTO_SET, &hu->flags))
Linus Torvalds55db4c62011-06-04 06:33:24 +0900441 return;
Marcel Holtmann0372a662005-10-28 19:20:45 +0200442
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443 spin_lock(&hu->rx_lock);
Marcel Holtmann9d1c40e2015-04-04 20:59:41 -0700444 hu->proto->recv(hu, data, count);
Chan-yeol Park788f0922013-04-02 21:24:22 +0900445
446 if (hu->hdev)
447 hu->hdev->stat.byte_rx += count;
448
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449 spin_unlock(&hu->rx_lock);
450
Alan Cox39c2e602008-04-30 00:54:18 -0700451 tty_unthrottle(tty);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452}
453
454static int hci_uart_register_dev(struct hci_uart *hu)
455{
456 struct hci_dev *hdev;
457
458 BT_DBG("");
459
460 /* Initialize and register HCI device */
461 hdev = hci_alloc_dev();
462 if (!hdev) {
463 BT_ERR("Can't allocate HCI device");
464 return -ENOMEM;
465 }
466
467 hu->hdev = hdev;
468
Marcel Holtmannc13854c2010-02-08 15:27:07 +0100469 hdev->bus = HCI_UART;
David Herrmann155961e2012-02-09 21:58:32 +0100470 hci_set_drvdata(hdev, hu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471
472 hdev->open = hci_uart_open;
473 hdev->close = hci_uart_close;
474 hdev->flush = hci_uart_flush;
475 hdev->send = hci_uart_send_frame;
Loic Poulaineb173802015-03-25 15:19:30 +0100476 hdev->setup = hci_uart_setup;
David Herrmann6935e0f2012-03-09 15:53:42 +0100477 SET_HCIDEV_DEV(hdev, hu->tty->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478
Johan Hedberg63c7d092010-07-12 11:37:04 -0300479 if (test_bit(HCI_UART_RAW_DEVICE, &hu->hdev_flags))
480 set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks);
481
Marcel Holtmann6afd04a2014-07-11 07:12:58 +0200482 if (test_bit(HCI_UART_EXT_CONFIG, &hu->hdev_flags))
483 set_bit(HCI_QUIRK_EXTERNAL_CONFIG, &hdev->quirks);
484
Marcel Holtmanna55e1f32012-02-24 17:12:24 +0100485 if (!test_bit(HCI_UART_RESET_ON_INIT, &hu->hdev_flags))
Szymon Janca6c511c2012-05-23 12:35:46 +0200486 set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);
Marcel Holtmanna55e1f32012-02-24 17:12:24 +0100487
Marcel Holtmann8a7a3fd2012-02-24 17:09:38 +0100488 if (test_bit(HCI_UART_CREATE_AMP, &hu->hdev_flags))
489 hdev->dev_type = HCI_AMP;
490 else
491 hdev->dev_type = HCI_BREDR;
492
Johan Hedberg9f2aee82012-07-16 16:12:11 +0300493 if (test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
494 return 0;
495
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496 if (hci_register_dev(hdev) < 0) {
497 BT_ERR("Can't register HCI device");
498 hci_free_dev(hdev);
499 return -ENODEV;
500 }
501
Johan Hedberg9f2aee82012-07-16 16:12:11 +0300502 set_bit(HCI_UART_REGISTERED, &hu->flags);
503
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504 return 0;
505}
506
507static int hci_uart_set_proto(struct hci_uart *hu, int id)
508{
509 struct hci_uart_proto *p;
Marcel Holtmann0372a662005-10-28 19:20:45 +0200510 int err;
511
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512 p = hci_uart_get_proto(id);
513 if (!p)
514 return -EPROTONOSUPPORT;
515
516 err = p->open(hu);
517 if (err)
518 return err;
519
520 hu->proto = p;
521
522 err = hci_uart_register_dev(hu);
523 if (err) {
524 p->close(hu);
525 return err;
526 }
Marcel Holtmann0372a662005-10-28 19:20:45 +0200527
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528 return 0;
529}
530
Marcel Holtmannbb72bd62014-07-11 07:12:57 +0200531static int hci_uart_set_flags(struct hci_uart *hu, unsigned long flags)
532{
533 unsigned long valid_flags = BIT(HCI_UART_RAW_DEVICE) |
534 BIT(HCI_UART_RESET_ON_INIT) |
535 BIT(HCI_UART_CREATE_AMP) |
Marcel Holtmann6afd04a2014-07-11 07:12:58 +0200536 BIT(HCI_UART_INIT_PENDING) |
Marcel Holtmannfb2ce8d2015-04-04 16:13:01 -0700537 BIT(HCI_UART_EXT_CONFIG) |
538 BIT(HCI_UART_VND_DETECT);
Marcel Holtmannbb72bd62014-07-11 07:12:57 +0200539
Marcel Holtmann41533fe2015-04-01 13:51:51 -0700540 if (flags & ~valid_flags)
Marcel Holtmannbb72bd62014-07-11 07:12:57 +0200541 return -EINVAL;
542
543 hu->hdev_flags = flags;
544
545 return 0;
546}
547
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548/* hci_uart_tty_ioctl()
549 *
550 * Process IOCTL system call for the tty device.
551 *
552 * Arguments:
553 *
554 * tty pointer to tty instance data
555 * file pointer to open file object for device
556 * cmd IOCTL command code
557 * arg argument for IOCTL call (cmd dependent)
558 *
559 * Return Value: Command dependent
560 */
Marcel Holtmannfacf5222015-04-04 19:57:22 -0700561static int hci_uart_tty_ioctl(struct tty_struct *tty, struct file *file,
562 unsigned int cmd, unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563{
Marcel Holtmanndfe19d22015-04-04 19:57:21 -0700564 struct hci_uart *hu = tty->disc_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565 int err = 0;
566
567 BT_DBG("");
568
569 /* Verify the status of the device */
570 if (!hu)
571 return -EBADF;
572
573 switch (cmd) {
574 case HCIUARTSETPROTO:
575 if (!test_and_set_bit(HCI_UART_PROTO_SET, &hu->flags)) {
576 err = hci_uart_set_proto(hu, arg);
577 if (err) {
578 clear_bit(HCI_UART_PROTO_SET, &hu->flags);
579 return err;
580 }
Marcel Holtmann0372a662005-10-28 19:20:45 +0200581 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582 return -EBUSY;
Marcel Holtmannc33be3c2007-05-09 09:15:45 +0200583 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584
585 case HCIUARTGETPROTO:
586 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
587 return hu->proto->id;
588 return -EUNATCH;
Marcel Holtmann0372a662005-10-28 19:20:45 +0200589
Marcel Holtmannd2158742007-05-09 09:15:35 +0200590 case HCIUARTGETDEVICE:
Marcel Holtmannc7e0c142014-07-12 17:00:29 +0200591 if (test_bit(HCI_UART_REGISTERED, &hu->flags))
Marcel Holtmannd2158742007-05-09 09:15:35 +0200592 return hu->hdev->id;
593 return -EUNATCH;
594
Johan Hedberg63c7d092010-07-12 11:37:04 -0300595 case HCIUARTSETFLAGS:
596 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
597 return -EBUSY;
Marcel Holtmannbb72bd62014-07-11 07:12:57 +0200598 err = hci_uart_set_flags(hu, arg);
599 if (err)
600 return err;
Johan Hedberg63c7d092010-07-12 11:37:04 -0300601 break;
602
603 case HCIUARTGETFLAGS:
604 return hu->hdev_flags;
605
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606 default:
Alan Cox47afa7a2008-10-13 10:44:17 +0100607 err = n_tty_ioctl_helper(tty, file, cmd, arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608 break;
Peter Senna Tschudina20890d2012-09-07 17:24:39 +0200609 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610
611 return err;
612}
613
614/*
615 * We don't provide read/write/poll interface for user space.
616 */
Marcel Holtmann0372a662005-10-28 19:20:45 +0200617static ssize_t hci_uart_tty_read(struct tty_struct *tty, struct file *file,
Marcel Holtmannfacf5222015-04-04 19:57:22 -0700618 unsigned char __user *buf, size_t nr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619{
620 return 0;
621}
622
Marcel Holtmann0372a662005-10-28 19:20:45 +0200623static ssize_t hci_uart_tty_write(struct tty_struct *tty, struct file *file,
Marcel Holtmannfacf5222015-04-04 19:57:22 -0700624 const unsigned char *data, size_t count)
Marcel Holtmann0372a662005-10-28 19:20:45 +0200625{
626 return 0;
627}
628
629static unsigned int hci_uart_tty_poll(struct tty_struct *tty,
Marcel Holtmannfacf5222015-04-04 19:57:22 -0700630 struct file *filp, poll_table *wait)
Marcel Holtmann0372a662005-10-28 19:20:45 +0200631{
632 return 0;
633}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634
635static int __init hci_uart_init(void)
636{
Alan Coxa352def2008-07-16 21:53:12 +0100637 static struct tty_ldisc_ops hci_uart_ldisc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638 int err;
639
640 BT_INFO("HCI UART driver ver %s", VERSION);
641
642 /* Register the tty discipline */
643
644 memset(&hci_uart_ldisc, 0, sizeof (hci_uart_ldisc));
Marcel Holtmann0372a662005-10-28 19:20:45 +0200645 hci_uart_ldisc.magic = TTY_LDISC_MAGIC;
646 hci_uart_ldisc.name = "n_hci";
647 hci_uart_ldisc.open = hci_uart_tty_open;
648 hci_uart_ldisc.close = hci_uart_tty_close;
649 hci_uart_ldisc.read = hci_uart_tty_read;
650 hci_uart_ldisc.write = hci_uart_tty_write;
651 hci_uart_ldisc.ioctl = hci_uart_tty_ioctl;
652 hci_uart_ldisc.poll = hci_uart_tty_poll;
Marcel Holtmann0372a662005-10-28 19:20:45 +0200653 hci_uart_ldisc.receive_buf = hci_uart_tty_receive;
654 hci_uart_ldisc.write_wakeup = hci_uart_tty_wakeup;
655 hci_uart_ldisc.owner = THIS_MODULE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656
Valentin Iliea08b15e2013-08-12 18:46:00 +0300657 err = tty_register_ldisc(N_HCI, &hci_uart_ldisc);
658 if (err) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659 BT_ERR("HCI line discipline registration failed. (%d)", err);
660 return err;
661 }
662
663#ifdef CONFIG_BT_HCIUART_H4
664 h4_init();
665#endif
666#ifdef CONFIG_BT_HCIUART_BCSP
667 bcsp_init();
668#endif
Ohad Ben-Cohen166d2f62007-10-20 13:42:36 +0200669#ifdef CONFIG_BT_HCIUART_LL
670 ll_init();
671#endif
Suraj Sumangalab3190df2010-07-19 12:34:07 +0530672#ifdef CONFIG_BT_HCIUART_ATH3K
673 ath_init();
674#endif
Johan Hedberg7dec65c2012-07-16 16:12:02 +0300675#ifdef CONFIG_BT_HCIUART_3WIRE
676 h5_init();
677#endif
Ohad Ben-Cohen166d2f62007-10-20 13:42:36 +0200678
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679 return 0;
680}
681
682static void __exit hci_uart_exit(void)
683{
684 int err;
685
686#ifdef CONFIG_BT_HCIUART_H4
687 h4_deinit();
688#endif
689#ifdef CONFIG_BT_HCIUART_BCSP
690 bcsp_deinit();
691#endif
Ohad Ben-Cohen166d2f62007-10-20 13:42:36 +0200692#ifdef CONFIG_BT_HCIUART_LL
693 ll_deinit();
694#endif
Suraj Sumangalab3190df2010-07-19 12:34:07 +0530695#ifdef CONFIG_BT_HCIUART_ATH3K
696 ath_deinit();
697#endif
Johan Hedberg7dec65c2012-07-16 16:12:02 +0300698#ifdef CONFIG_BT_HCIUART_3WIRE
699 h5_deinit();
700#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701
702 /* Release tty registration of line discipline */
Valentin Iliea08b15e2013-08-12 18:46:00 +0300703 err = tty_unregister_ldisc(N_HCI);
704 if (err)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705 BT_ERR("Can't unregister HCI line discipline (%d)", err);
706}
707
708module_init(hci_uart_init);
709module_exit(hci_uart_exit);
710
Marcel Holtmann63fbd242008-08-18 13:23:53 +0200711MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712MODULE_DESCRIPTION("Bluetooth HCI UART driver ver " VERSION);
713MODULE_VERSION(VERSION);
714MODULE_LICENSE("GPL");
715MODULE_ALIAS_LDISC(N_HCI);