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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>
Frederic Danis18aeb442015-05-28 11:25:01 +020043#include <linux/firmware.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070044
45#include <net/bluetooth/bluetooth.h>
46#include <net/bluetooth/hci_core.h>
47
Marcel Holtmannbca03c92015-04-06 00:52:14 -070048#include "btintel.h"
Marcel Holtmann3e0ac122015-04-05 22:52:12 -070049#include "btbcm.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070050#include "hci_uart.h"
51
Marcel Holtmann788a6752015-04-04 22:36:04 -070052#define VERSION "2.3"
Marcel Holtmann0372a662005-10-28 19:20:45 +020053
Marcel Holtmann4ee7ef12015-04-04 22:11:43 -070054static const struct hci_uart_proto *hup[HCI_UART_MAX_PROTO];
Linus Torvalds1da177e2005-04-16 15:20:36 -070055
Marcel Holtmann4ee7ef12015-04-04 22:11:43 -070056int hci_uart_register_proto(const struct hci_uart_proto *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -070057{
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;
Marcel Holtmann0372a662005-10-28 19:20:45 +020065
Marcel Holtmann01009ee2015-04-04 22:27:35 -070066 BT_INFO("HCI UART protocol %s registered", p->name);
67
Linus Torvalds1da177e2005-04-16 15:20:36 -070068 return 0;
69}
70
Marcel Holtmann4ee7ef12015-04-04 22:11:43 -070071int hci_uart_unregister_proto(const struct hci_uart_proto *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -070072{
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;
Marcel Holtmann0372a662005-10-28 19:20:45 +020080
Linus Torvalds1da177e2005-04-16 15:20:36 -070081 return 0;
82}
83
Marcel Holtmann4ee7ef12015-04-04 22:11:43 -070084static const struct hci_uart_proto *hci_uart_get_proto(unsigned int id)
Linus Torvalds1da177e2005-04-16 15:20:36 -070085{
86 if (id >= HCI_UART_MAX_PROTO)
87 return NULL;
Marcel Holtmann0372a662005-10-28 19:20:45 +020088
Linus Torvalds1da177e2005-04-16 15:20:36 -070089 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;
Marcel Holtmann0372a662005-10-28 19:20:45 +020095
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 /* 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:
Karl Beldan7f8f2722010-10-07 21:57:10 +0200107 hdev->stat.sco_tx++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 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;
Marcel Holtmann0372a662005-10-28 19:20:45 +0200115
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 if (!skb)
117 skb = hu->proto->dequeue(hu);
118 else
119 hu->tx_skb = NULL;
Marcel Holtmann0372a662005-10-28 19:20:45 +0200120
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 return skb;
122}
123
124int hci_uart_tx_wakeup(struct hci_uart *hu)
125{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126 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
Felipe Balbida64c272014-04-23 09:58:26 -0500133 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149restart:
150 clear_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
151
152 while ((skb = hci_uart_dequeue(hu))) {
153 int len;
Marcel Holtmann0372a662005-10-28 19:20:45 +0200154
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
Alan Coxf34d7a52008-04-30 00:54:13 -0700156 len = tty->ops->write(tty, skb->data, skb->len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157 hdev->stat.byte_tx += len;
158
159 skb_pull(skb, len);
160 if (skb->len) {
161 hu->tx_skb = skb;
162 break;
163 }
Marcel Holtmann0372a662005-10-28 19:20:45 +0200164
Marcel Holtmann0d48d932005-08-09 20:30:28 -0700165 hci_uart_tx_complete(hu, bt_cb(skb)->pkt_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 kfree_skb(skb);
Marcel Holtmann0372a662005-10-28 19:20:45 +0200167 }
168
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 if (test_bit(HCI_UART_TX_WAKEUP, &hu->tx_state))
170 goto restart;
171
172 clear_bit(HCI_UART_SENDING, &hu->tx_state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173}
174
Johan Hedberg9f2aee82012-07-16 16:12:11 +0300175static 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204/* ------- 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 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 return 0;
212}
213
214/* Reset device */
215static int hci_uart_flush(struct hci_dev *hdev)
216{
David Herrmann155961e2012-02-09 21:58:32 +0100217 struct hci_uart *hu = hci_get_drvdata(hdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 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);
Alan Coxf34d7a52008-04-30 00:54:13 -0700228 tty_driver_flush_buffer(tty);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229
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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 hci_uart_flush(hdev);
David Newall3611f4d2008-02-11 21:41:30 -0800242 hdev->flush = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 return 0;
244}
245
246/* Send frames from HCI layer */
Marcel Holtmann7bd8f092013-10-11 06:19:18 -0700247static int hci_uart_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248{
Marcel Holtmann52bc4232013-10-11 07:01:03 -0700249 struct hci_uart *hu = hci_get_drvdata(hdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250
Marcel Holtmann0d48d932005-08-09 20:30:28 -0700251 BT_DBG("%s: type %d len %d", hdev->name, bt_cb(skb)->pkt_type, skb->len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252
253 hu->proto->enqueue(hu, skb);
254
255 hci_uart_tx_wakeup(hu);
Marcel Holtmann0372a662005-10-28 19:20:45 +0200256
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 return 0;
258}
259
Ilya Faenson2a973df2015-06-17 17:30:56 -0400260/* Flow control or un-flow control the device */
261void hci_uart_set_flow_control(struct hci_uart *hu, bool enable)
262{
263 struct tty_struct *tty = hu->tty;
264 struct ktermios ktermios;
265 int status;
266 unsigned int set = 0;
267 unsigned int clear = 0;
268
269 if (enable) {
270 /* Disable hardware flow control */
271 ktermios = tty->termios;
272 ktermios.c_cflag &= ~CRTSCTS;
273 status = tty_set_termios(tty, &ktermios);
274 BT_DBG("Disabling hardware flow control: %s",
275 status ? "failed" : "success");
276
277 /* Clear RTS to prevent the device from sending */
278 /* Most UARTs need OUT2 to enable interrupts */
279 status = tty->driver->ops->tiocmget(tty);
280 BT_DBG("Current tiocm 0x%x", status);
281
282 set &= ~(TIOCM_OUT2 | TIOCM_RTS);
283 clear = ~set;
284 set &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
285 TIOCM_OUT2 | TIOCM_LOOP;
286 clear &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
287 TIOCM_OUT2 | TIOCM_LOOP;
288 status = tty->driver->ops->tiocmset(tty, set, clear);
289 BT_DBG("Clearing RTS: %s", status ? "failed" : "success");
290 } else {
291 /* Set RTS to allow the device to send again */
292 status = tty->driver->ops->tiocmget(tty);
293 BT_DBG("Current tiocm 0x%x", status);
294
295 set |= (TIOCM_OUT2 | TIOCM_RTS);
296 clear = ~set;
297 set &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
298 TIOCM_OUT2 | TIOCM_LOOP;
299 clear &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
300 TIOCM_OUT2 | TIOCM_LOOP;
301 status = tty->driver->ops->tiocmset(tty, set, clear);
302 BT_DBG("Setting RTS: %s", status ? "failed" : "success");
303
304 /* Re-enable hardware flow control */
305 ktermios = tty->termios;
306 ktermios.c_cflag |= CRTSCTS;
307 status = tty_set_termios(tty, &ktermios);
308 BT_DBG("Enabling hardware flow control: %s",
309 status ? "failed" : "success");
310 }
311}
312
313void hci_uart_set_speeds(struct hci_uart *hu, unsigned int init_speed,
314 unsigned int oper_speed)
315{
316 hu->init_speed = init_speed;
317 hu->oper_speed = oper_speed;
318}
319
320void hci_uart_init_tty(struct hci_uart *hu)
321{
322 struct tty_struct *tty = hu->tty;
323 struct ktermios ktermios;
324
325 /* Bring the UART into a known 8 bits no parity hw fc state */
326 ktermios = tty->termios;
327 ktermios.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP |
328 INLCR | IGNCR | ICRNL | IXON);
329 ktermios.c_oflag &= ~OPOST;
330 ktermios.c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
331 ktermios.c_cflag &= ~(CSIZE | PARENB);
332 ktermios.c_cflag |= CS8;
333 ktermios.c_cflag |= CRTSCTS;
334
335 /* tty_set_termios() return not checked as it is always 0 */
336 tty_set_termios(tty, &ktermios);
337}
338
Frederic Danis77213832015-05-28 11:25:03 +0200339void hci_uart_set_baudrate(struct hci_uart *hu, unsigned int speed)
340{
341 struct tty_struct *tty = hu->tty;
342 struct ktermios ktermios;
343
344 ktermios = tty->termios;
345 ktermios.c_cflag &= ~CBAUD;
Frederic Danis77213832015-05-28 11:25:03 +0200346 tty_termios_encode_baud_rate(&ktermios, speed, speed);
347
348 /* tty_set_termios() return not checked as it is always 0 */
349 tty_set_termios(tty, &ktermios);
350
Ilya Faenson2a973df2015-06-17 17:30:56 -0400351 BT_DBG("%s: New tty speeds: %d/%d", hu->hdev->name,
352 tty->termios.c_ispeed, tty->termios.c_ospeed);
Frederic Danis77213832015-05-28 11:25:03 +0200353}
354
Loic Poulaineb173802015-03-25 15:19:30 +0100355static int hci_uart_setup(struct hci_dev *hdev)
356{
357 struct hci_uart *hu = hci_get_drvdata(hdev);
Marcel Holtmannfb2ce8d2015-04-04 16:13:01 -0700358 struct hci_rp_read_local_version *ver;
359 struct sk_buff *skb;
Ilya Faenson2a973df2015-06-17 17:30:56 -0400360 unsigned int speed;
Frederic Danis77213832015-05-28 11:25:03 +0200361 int err;
362
Ilya Faenson2a973df2015-06-17 17:30:56 -0400363 /* Init speed if any */
Frederic Danis960ef1d2015-06-18 12:43:27 +0200364 if (hu->init_speed)
Ilya Faenson2a973df2015-06-17 17:30:56 -0400365 speed = hu->init_speed;
Frederic Danis960ef1d2015-06-18 12:43:27 +0200366 else if (hu->proto->init_speed)
367 speed = hu->proto->init_speed;
Ilya Faenson2a973df2015-06-17 17:30:56 -0400368 else
369 speed = 0;
Frederic Danis77213832015-05-28 11:25:03 +0200370
Ilya Faenson2a973df2015-06-17 17:30:56 -0400371 if (speed)
372 hci_uart_set_baudrate(hu, speed);
373
374 /* Operational speed if any */
Frederic Danis960ef1d2015-06-18 12:43:27 +0200375 if (hu->oper_speed)
Ilya Faenson2a973df2015-06-17 17:30:56 -0400376 speed = hu->oper_speed;
Frederic Danis960ef1d2015-06-18 12:43:27 +0200377 else if (hu->proto->oper_speed)
378 speed = hu->proto->oper_speed;
Ilya Faenson2a973df2015-06-17 17:30:56 -0400379 else
380 speed = 0;
381
382 if (hu->proto->set_baudrate && speed) {
383 err = hu->proto->set_baudrate(hu, speed);
Frederic Danis77213832015-05-28 11:25:03 +0200384 if (!err)
Ilya Faenson2a973df2015-06-17 17:30:56 -0400385 hci_uart_set_baudrate(hu, speed);
Frederic Danis77213832015-05-28 11:25:03 +0200386 }
Loic Poulaineb173802015-03-25 15:19:30 +0100387
388 if (hu->proto->setup)
389 return hu->proto->setup(hu);
390
Marcel Holtmannfb2ce8d2015-04-04 16:13:01 -0700391 if (!test_bit(HCI_UART_VND_DETECT, &hu->hdev_flags))
392 return 0;
393
394 skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_VERSION, 0, NULL,
395 HCI_INIT_TIMEOUT);
396 if (IS_ERR(skb)) {
397 BT_ERR("%s: Reading local version information failed (%ld)",
398 hdev->name, PTR_ERR(skb));
399 return 0;
400 }
401
402 if (skb->len != sizeof(*ver)) {
403 BT_ERR("%s: Event length mismatch for version information",
404 hdev->name);
405 goto done;
406 }
407
408 ver = (struct hci_rp_read_local_version *)skb->data;
409
410 switch (le16_to_cpu(ver->manufacturer)) {
Marcel Holtmann16e38872015-04-04 16:13:02 -0700411#ifdef CONFIG_BT_HCIUART_INTEL
412 case 2:
Marcel Holtmannbca03c92015-04-06 00:52:14 -0700413 hdev->set_bdaddr = btintel_set_bdaddr;
414 btintel_check_bdaddr(hdev);
Marcel Holtmann16e38872015-04-04 16:13:02 -0700415 break;
416#endif
Marcel Holtmanne9a2dd22015-04-04 16:13:03 -0700417#ifdef CONFIG_BT_HCIUART_BCM
418 case 15:
Marcel Holtmann3e0ac122015-04-05 22:52:12 -0700419 hdev->set_bdaddr = btbcm_set_bdaddr;
420 btbcm_check_bdaddr(hdev);
Marcel Holtmanne9a2dd22015-04-04 16:13:03 -0700421 break;
422#endif
Marcel Holtmannfb2ce8d2015-04-04 16:13:01 -0700423 }
424
425done:
426 kfree_skb(skb);
Loic Poulaineb173802015-03-25 15:19:30 +0100427 return 0;
428}
429
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430/* ------ LDISC part ------ */
431/* hci_uart_tty_open
Chan-yeol Park1687dfc2013-04-02 21:24:23 +0900432 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433 * Called when line discipline changed to HCI_UART.
434 *
435 * Arguments:
436 * tty pointer to tty info structure
Chan-yeol Park1687dfc2013-04-02 21:24:23 +0900437 * Return Value:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 * 0 if success, otherwise error code
439 */
440static int hci_uart_tty_open(struct tty_struct *tty)
441{
Jiri Slabyf327b342012-10-18 22:26:34 +0200442 struct hci_uart *hu;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443
444 BT_DBG("tty %p", tty);
445
Alan Coxc19483c2010-10-22 14:11:26 +0100446 /* Error if the tty has no write op instead of leaving an exploitable
447 hole */
448 if (tty->ops->write == NULL)
449 return -EOPNOTSUPP;
450
Valentin Iliea08b15e2013-08-12 18:46:00 +0300451 hu = kzalloc(sizeof(struct hci_uart), GFP_KERNEL);
452 if (!hu) {
Marcel Holtmann77851622006-09-21 16:23:19 +0200453 BT_ERR("Can't allocate control structure");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454 return -ENFILE;
455 }
Marcel Holtmann0372a662005-10-28 19:20:45 +0200456
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457 tty->disc_data = hu;
458 hu->tty = tty;
Alan Cox33f0f882006-01-09 20:54:13 -0800459 tty->receive_room = 65536;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460
Johan Hedberg9f2aee82012-07-16 16:12:11 +0300461 INIT_WORK(&hu->init_ready, hci_uart_init_work);
Felipe Balbida64c272014-04-23 09:58:26 -0500462 INIT_WORK(&hu->write_work, hci_uart_write_work);
Johan Hedberg9f2aee82012-07-16 16:12:11 +0300463
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 /* Flush any pending characters in the driver and line discipline. */
Marcel Holtmann0372a662005-10-28 19:20:45 +0200465
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466 /* FIXME: why is this needed. Note don't use ldisc_ref here as the
467 open path is before the ldisc is referencable */
Marcel Holtmann0372a662005-10-28 19:20:45 +0200468
Alan Coxc65c9bc2009-06-11 12:50:12 +0100469 if (tty->ldisc->ops->flush_buffer)
470 tty->ldisc->ops->flush_buffer(tty);
Alan Coxf34d7a52008-04-30 00:54:13 -0700471 tty_driver_flush_buffer(tty);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472
473 return 0;
474}
475
476/* hci_uart_tty_close()
477 *
478 * Called when the line discipline is changed to something
479 * else, the tty is closed, or the tty detects a hangup.
480 */
481static void hci_uart_tty_close(struct tty_struct *tty)
482{
Marcel Holtmanndfe19d22015-04-04 19:57:21 -0700483 struct hci_uart *hu = tty->disc_data;
Johan Hedbergdac670b2012-07-16 16:12:10 +0300484 struct hci_dev *hdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485
486 BT_DBG("tty %p", tty);
487
488 /* Detach from the tty */
489 tty->disc_data = NULL;
490
Johan Hedbergdac670b2012-07-16 16:12:10 +0300491 if (!hu)
492 return;
Marcel Holtmann22ad4202007-05-09 09:15:40 +0200493
Johan Hedbergdac670b2012-07-16 16:12:10 +0300494 hdev = hu->hdev;
495 if (hdev)
496 hci_uart_close(hdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497
Felipe Balbida64c272014-04-23 09:58:26 -0500498 cancel_work_sync(&hu->write_work);
499
Johan Hedbergdac670b2012-07-16 16:12:10 +0300500 if (test_and_clear_bit(HCI_UART_PROTO_SET, &hu->flags)) {
501 if (hdev) {
Johan Hedberg9f2aee82012-07-16 16:12:11 +0300502 if (test_bit(HCI_UART_REGISTERED, &hu->flags))
503 hci_unregister_dev(hdev);
Johan Hedbergdac670b2012-07-16 16:12:10 +0300504 hci_free_dev(hdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505 }
Johan Hedbergdac670b2012-07-16 16:12:10 +0300506 hu->proto->close(hu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507 }
Johan Hedbergdac670b2012-07-16 16:12:10 +0300508
509 kfree(hu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510}
511
512/* hci_uart_tty_wakeup()
513 *
514 * Callback for transmit wakeup. Called when low level
515 * device driver can accept more send data.
516 *
517 * Arguments: tty pointer to associated tty instance data
518 * Return Value: None
519 */
520static void hci_uart_tty_wakeup(struct tty_struct *tty)
521{
Marcel Holtmanndfe19d22015-04-04 19:57:21 -0700522 struct hci_uart *hu = tty->disc_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523
524 BT_DBG("");
525
526 if (!hu)
527 return;
528
529 clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
530
531 if (tty != hu->tty)
532 return;
533
534 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
535 hci_uart_tx_wakeup(hu);
536}
537
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538/* hci_uart_tty_receive()
Chan-yeol Park1687dfc2013-04-02 21:24:23 +0900539 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540 * Called by tty low level driver when receive data is
541 * available.
Chan-yeol Park1687dfc2013-04-02 21:24:23 +0900542 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543 * Arguments: tty pointer to tty isntance data
544 * data pointer to received data
545 * flags pointer to flags for data
546 * count count of received data in bytes
Chan-yeol Park1687dfc2013-04-02 21:24:23 +0900547 *
Linus Torvalds55db4c62011-06-04 06:33:24 +0900548 * Return Value: None
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549 */
Marcel Holtmannfacf5222015-04-04 19:57:22 -0700550static void hci_uart_tty_receive(struct tty_struct *tty, const u8 *data,
551 char *flags, int count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552{
Marcel Holtmanndfe19d22015-04-04 19:57:21 -0700553 struct hci_uart *hu = tty->disc_data;
Marcel Holtmann0372a662005-10-28 19:20:45 +0200554
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555 if (!hu || tty != hu->tty)
Linus Torvalds55db4c62011-06-04 06:33:24 +0900556 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557
558 if (!test_bit(HCI_UART_PROTO_SET, &hu->flags))
Linus Torvalds55db4c62011-06-04 06:33:24 +0900559 return;
Marcel Holtmann0372a662005-10-28 19:20:45 +0200560
Frederic Danis7649faf2015-09-23 18:18:10 +0200561 /* It does not need a lock here as it is already protected by a mutex in
562 * tty caller
563 */
Marcel Holtmann9d1c40e2015-04-04 20:59:41 -0700564 hu->proto->recv(hu, data, count);
Chan-yeol Park788f0922013-04-02 21:24:22 +0900565
566 if (hu->hdev)
567 hu->hdev->stat.byte_rx += count;
568
Alan Cox39c2e602008-04-30 00:54:18 -0700569 tty_unthrottle(tty);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570}
571
572static int hci_uart_register_dev(struct hci_uart *hu)
573{
574 struct hci_dev *hdev;
575
576 BT_DBG("");
577
578 /* Initialize and register HCI device */
579 hdev = hci_alloc_dev();
580 if (!hdev) {
581 BT_ERR("Can't allocate HCI device");
582 return -ENOMEM;
583 }
584
585 hu->hdev = hdev;
586
Marcel Holtmannc13854c2010-02-08 15:27:07 +0100587 hdev->bus = HCI_UART;
David Herrmann155961e2012-02-09 21:58:32 +0100588 hci_set_drvdata(hdev, hu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589
Marcel Holtmannaee61f72015-10-20 21:30:45 +0200590 /* Only when vendor specific setup callback is provided, consider
591 * the manufacturer information valid. This avoids filling in the
592 * value for Ericsson when nothing is specified.
593 */
594 if (hu->proto->setup)
595 hdev->manufacturer = hu->proto->manufacturer;
596
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597 hdev->open = hci_uart_open;
598 hdev->close = hci_uart_close;
599 hdev->flush = hci_uart_flush;
600 hdev->send = hci_uart_send_frame;
Loic Poulaineb173802015-03-25 15:19:30 +0100601 hdev->setup = hci_uart_setup;
David Herrmann6935e0f2012-03-09 15:53:42 +0100602 SET_HCIDEV_DEV(hdev, hu->tty->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603
Johan Hedberg63c7d092010-07-12 11:37:04 -0300604 if (test_bit(HCI_UART_RAW_DEVICE, &hu->hdev_flags))
605 set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks);
606
Marcel Holtmann6afd04a2014-07-11 07:12:58 +0200607 if (test_bit(HCI_UART_EXT_CONFIG, &hu->hdev_flags))
608 set_bit(HCI_QUIRK_EXTERNAL_CONFIG, &hdev->quirks);
609
Marcel Holtmanna55e1f32012-02-24 17:12:24 +0100610 if (!test_bit(HCI_UART_RESET_ON_INIT, &hu->hdev_flags))
Szymon Janca6c511c2012-05-23 12:35:46 +0200611 set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);
Marcel Holtmanna55e1f32012-02-24 17:12:24 +0100612
Marcel Holtmann8a7a3fd2012-02-24 17:09:38 +0100613 if (test_bit(HCI_UART_CREATE_AMP, &hu->hdev_flags))
614 hdev->dev_type = HCI_AMP;
615 else
616 hdev->dev_type = HCI_BREDR;
617
Johan Hedberg9f2aee82012-07-16 16:12:11 +0300618 if (test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
619 return 0;
620
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621 if (hci_register_dev(hdev) < 0) {
622 BT_ERR("Can't register HCI device");
623 hci_free_dev(hdev);
624 return -ENODEV;
625 }
626
Johan Hedberg9f2aee82012-07-16 16:12:11 +0300627 set_bit(HCI_UART_REGISTERED, &hu->flags);
628
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629 return 0;
630}
631
632static int hci_uart_set_proto(struct hci_uart *hu, int id)
633{
Marcel Holtmann4ee7ef12015-04-04 22:11:43 -0700634 const struct hci_uart_proto *p;
Marcel Holtmann0372a662005-10-28 19:20:45 +0200635 int err;
636
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637 p = hci_uart_get_proto(id);
638 if (!p)
639 return -EPROTONOSUPPORT;
640
641 err = p->open(hu);
642 if (err)
643 return err;
644
645 hu->proto = p;
646
647 err = hci_uart_register_dev(hu);
648 if (err) {
649 p->close(hu);
650 return err;
651 }
Marcel Holtmann0372a662005-10-28 19:20:45 +0200652
Linus Torvalds1da177e2005-04-16 15:20:36 -0700653 return 0;
654}
655
Marcel Holtmannbb72bd62014-07-11 07:12:57 +0200656static int hci_uart_set_flags(struct hci_uart *hu, unsigned long flags)
657{
658 unsigned long valid_flags = BIT(HCI_UART_RAW_DEVICE) |
659 BIT(HCI_UART_RESET_ON_INIT) |
660 BIT(HCI_UART_CREATE_AMP) |
Marcel Holtmann6afd04a2014-07-11 07:12:58 +0200661 BIT(HCI_UART_INIT_PENDING) |
Marcel Holtmannfb2ce8d2015-04-04 16:13:01 -0700662 BIT(HCI_UART_EXT_CONFIG) |
663 BIT(HCI_UART_VND_DETECT);
Marcel Holtmannbb72bd62014-07-11 07:12:57 +0200664
Marcel Holtmann41533fe2015-04-01 13:51:51 -0700665 if (flags & ~valid_flags)
Marcel Holtmannbb72bd62014-07-11 07:12:57 +0200666 return -EINVAL;
667
668 hu->hdev_flags = flags;
669
670 return 0;
671}
672
Linus Torvalds1da177e2005-04-16 15:20:36 -0700673/* hci_uart_tty_ioctl()
674 *
675 * Process IOCTL system call for the tty device.
676 *
677 * Arguments:
678 *
679 * tty pointer to tty instance data
680 * file pointer to open file object for device
681 * cmd IOCTL command code
682 * arg argument for IOCTL call (cmd dependent)
683 *
684 * Return Value: Command dependent
685 */
Marcel Holtmannfacf5222015-04-04 19:57:22 -0700686static int hci_uart_tty_ioctl(struct tty_struct *tty, struct file *file,
687 unsigned int cmd, unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688{
Marcel Holtmanndfe19d22015-04-04 19:57:21 -0700689 struct hci_uart *hu = tty->disc_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690 int err = 0;
691
692 BT_DBG("");
693
694 /* Verify the status of the device */
695 if (!hu)
696 return -EBADF;
697
698 switch (cmd) {
699 case HCIUARTSETPROTO:
700 if (!test_and_set_bit(HCI_UART_PROTO_SET, &hu->flags)) {
701 err = hci_uart_set_proto(hu, arg);
702 if (err) {
703 clear_bit(HCI_UART_PROTO_SET, &hu->flags);
704 return err;
705 }
Marcel Holtmann0372a662005-10-28 19:20:45 +0200706 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707 return -EBUSY;
Marcel Holtmannc33be3c2007-05-09 09:15:45 +0200708 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709
710 case HCIUARTGETPROTO:
711 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
712 return hu->proto->id;
713 return -EUNATCH;
Marcel Holtmann0372a662005-10-28 19:20:45 +0200714
Marcel Holtmannd2158742007-05-09 09:15:35 +0200715 case HCIUARTGETDEVICE:
Marcel Holtmannc7e0c142014-07-12 17:00:29 +0200716 if (test_bit(HCI_UART_REGISTERED, &hu->flags))
Marcel Holtmannd2158742007-05-09 09:15:35 +0200717 return hu->hdev->id;
718 return -EUNATCH;
719
Johan Hedberg63c7d092010-07-12 11:37:04 -0300720 case HCIUARTSETFLAGS:
721 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
722 return -EBUSY;
Marcel Holtmannbb72bd62014-07-11 07:12:57 +0200723 err = hci_uart_set_flags(hu, arg);
724 if (err)
725 return err;
Johan Hedberg63c7d092010-07-12 11:37:04 -0300726 break;
727
728 case HCIUARTGETFLAGS:
729 return hu->hdev_flags;
730
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731 default:
Alan Cox47afa7a2008-10-13 10:44:17 +0100732 err = n_tty_ioctl_helper(tty, file, cmd, arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733 break;
Peter Senna Tschudina20890d2012-09-07 17:24:39 +0200734 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735
736 return err;
737}
738
739/*
740 * We don't provide read/write/poll interface for user space.
741 */
Marcel Holtmann0372a662005-10-28 19:20:45 +0200742static ssize_t hci_uart_tty_read(struct tty_struct *tty, struct file *file,
Marcel Holtmannfacf5222015-04-04 19:57:22 -0700743 unsigned char __user *buf, size_t nr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744{
745 return 0;
746}
747
Marcel Holtmann0372a662005-10-28 19:20:45 +0200748static ssize_t hci_uart_tty_write(struct tty_struct *tty, struct file *file,
Marcel Holtmannfacf5222015-04-04 19:57:22 -0700749 const unsigned char *data, size_t count)
Marcel Holtmann0372a662005-10-28 19:20:45 +0200750{
751 return 0;
752}
753
754static unsigned int hci_uart_tty_poll(struct tty_struct *tty,
Marcel Holtmannfacf5222015-04-04 19:57:22 -0700755 struct file *filp, poll_table *wait)
Marcel Holtmann0372a662005-10-28 19:20:45 +0200756{
757 return 0;
758}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700759
760static int __init hci_uart_init(void)
761{
Alan Coxa352def2008-07-16 21:53:12 +0100762 static struct tty_ldisc_ops hci_uart_ldisc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763 int err;
764
765 BT_INFO("HCI UART driver ver %s", VERSION);
766
767 /* Register the tty discipline */
768
Prasanna Karthikacf50c52015-07-23 11:08:52 +0000769 memset(&hci_uart_ldisc, 0, sizeof(hci_uart_ldisc));
Marcel Holtmann0372a662005-10-28 19:20:45 +0200770 hci_uart_ldisc.magic = TTY_LDISC_MAGIC;
771 hci_uart_ldisc.name = "n_hci";
772 hci_uart_ldisc.open = hci_uart_tty_open;
773 hci_uart_ldisc.close = hci_uart_tty_close;
774 hci_uart_ldisc.read = hci_uart_tty_read;
775 hci_uart_ldisc.write = hci_uart_tty_write;
776 hci_uart_ldisc.ioctl = hci_uart_tty_ioctl;
777 hci_uart_ldisc.poll = hci_uart_tty_poll;
Marcel Holtmann0372a662005-10-28 19:20:45 +0200778 hci_uart_ldisc.receive_buf = hci_uart_tty_receive;
779 hci_uart_ldisc.write_wakeup = hci_uart_tty_wakeup;
780 hci_uart_ldisc.owner = THIS_MODULE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781
Valentin Iliea08b15e2013-08-12 18:46:00 +0300782 err = tty_register_ldisc(N_HCI, &hci_uart_ldisc);
783 if (err) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784 BT_ERR("HCI line discipline registration failed. (%d)", err);
785 return err;
786 }
787
788#ifdef CONFIG_BT_HCIUART_H4
789 h4_init();
790#endif
791#ifdef CONFIG_BT_HCIUART_BCSP
792 bcsp_init();
793#endif
Ohad Ben-Cohen166d2f62007-10-20 13:42:36 +0200794#ifdef CONFIG_BT_HCIUART_LL
795 ll_init();
796#endif
Suraj Sumangalab3190df2010-07-19 12:34:07 +0530797#ifdef CONFIG_BT_HCIUART_ATH3K
798 ath_init();
799#endif
Johan Hedberg7dec65c2012-07-16 16:12:02 +0300800#ifdef CONFIG_BT_HCIUART_3WIRE
801 h5_init();
802#endif
Loic Poulainca93cee2015-07-01 12:20:26 +0200803#ifdef CONFIG_BT_HCIUART_INTEL
804 intel_init();
805#endif
Marcel Holtmannbdd88182015-04-05 22:52:18 -0700806#ifdef CONFIG_BT_HCIUART_BCM
807 bcm_init();
808#endif
Ben Young Tae Kim0ff252c2015-08-10 14:24:17 -0700809#ifdef CONFIG_BT_HCIUART_QCA
810 qca_init();
811#endif
Ohad Ben-Cohen166d2f62007-10-20 13:42:36 +0200812
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813 return 0;
814}
815
816static void __exit hci_uart_exit(void)
817{
818 int err;
819
820#ifdef CONFIG_BT_HCIUART_H4
821 h4_deinit();
822#endif
823#ifdef CONFIG_BT_HCIUART_BCSP
824 bcsp_deinit();
825#endif
Ohad Ben-Cohen166d2f62007-10-20 13:42:36 +0200826#ifdef CONFIG_BT_HCIUART_LL
827 ll_deinit();
828#endif
Suraj Sumangalab3190df2010-07-19 12:34:07 +0530829#ifdef CONFIG_BT_HCIUART_ATH3K
830 ath_deinit();
831#endif
Johan Hedberg7dec65c2012-07-16 16:12:02 +0300832#ifdef CONFIG_BT_HCIUART_3WIRE
833 h5_deinit();
834#endif
Loic Poulainca93cee2015-07-01 12:20:26 +0200835#ifdef CONFIG_BT_HCIUART_INTEL
836 intel_deinit();
837#endif
Marcel Holtmannbdd88182015-04-05 22:52:18 -0700838#ifdef CONFIG_BT_HCIUART_BCM
839 bcm_deinit();
840#endif
Ben Young Tae Kim0ff252c2015-08-10 14:24:17 -0700841#ifdef CONFIG_BT_HCIUART_QCA
842 qca_deinit();
843#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700844
845 /* Release tty registration of line discipline */
Valentin Iliea08b15e2013-08-12 18:46:00 +0300846 err = tty_unregister_ldisc(N_HCI);
847 if (err)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700848 BT_ERR("Can't unregister HCI line discipline (%d)", err);
849}
850
851module_init(hci_uart_init);
852module_exit(hci_uart_exit);
853
Marcel Holtmann63fbd242008-08-18 13:23:53 +0200854MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855MODULE_DESCRIPTION("Bluetooth HCI UART driver ver " VERSION);
856MODULE_VERSION(VERSION);
857MODULE_LICENSE("GPL");
858MODULE_ALIAS_LDISC(N_HCI);