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Commit | Line | Data |
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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 | 2 | /* |
1da177e4 | 3 | * |
0372a662 MH |
4 | * Bluetooth HCI UART driver |
5 | * | |
6 | * Copyright (C) 2000-2001 Qualcomm Incorporated | |
7 | * Copyright (C) 2002-2003 Maxim Krasnyansky <maxk@qualcomm.com> | |
8 | * Copyright (C) 2004-2005 Marcel Holtmann <marcel@holtmann.org> | |
1da177e4 | 9 | */ |
1da177e4 | 10 | |
1da177e4 LT |
11 | #include <linux/module.h> |
12 | ||
13 | #include <linux/kernel.h> | |
14 | #include <linux/init.h> | |
1da177e4 LT |
15 | #include <linux/types.h> |
16 | #include <linux/fcntl.h> | |
17 | #include <linux/interrupt.h> | |
18 | #include <linux/ptrace.h> | |
19 | #include <linux/poll.h> | |
20 | ||
21 | #include <linux/slab.h> | |
22 | #include <linux/tty.h> | |
23 | #include <linux/errno.h> | |
24 | #include <linux/string.h> | |
25 | #include <linux/signal.h> | |
26 | #include <linux/ioctl.h> | |
27 | #include <linux/skbuff.h> | |
18aeb444 | 28 | #include <linux/firmware.h> |
7841d554 | 29 | #include <linux/serdev.h> |
1da177e4 LT |
30 | |
31 | #include <net/bluetooth/bluetooth.h> | |
32 | #include <net/bluetooth/hci_core.h> | |
33 | ||
bca03c95 | 34 | #include "btintel.h" |
3e0ac12a | 35 | #include "btbcm.h" |
1da177e4 LT |
36 | #include "hci_uart.h" |
37 | ||
788a6756 | 38 | #define VERSION "2.3" |
0372a662 | 39 | |
4ee7ef19 | 40 | static const struct hci_uart_proto *hup[HCI_UART_MAX_PROTO]; |
1da177e4 | 41 | |
4ee7ef19 | 42 | int hci_uart_register_proto(const struct hci_uart_proto *p) |
1da177e4 LT |
43 | { |
44 | if (p->id >= HCI_UART_MAX_PROTO) | |
45 | return -EINVAL; | |
46 | ||
47 | if (hup[p->id]) | |
48 | return -EEXIST; | |
49 | ||
50 | hup[p->id] = p; | |
0372a662 | 51 | |
01009eec MH |
52 | BT_INFO("HCI UART protocol %s registered", p->name); |
53 | ||
1da177e4 LT |
54 | return 0; |
55 | } | |
56 | ||
4ee7ef19 | 57 | int hci_uart_unregister_proto(const struct hci_uart_proto *p) |
1da177e4 LT |
58 | { |
59 | if (p->id >= HCI_UART_MAX_PROTO) | |
60 | return -EINVAL; | |
61 | ||
62 | if (!hup[p->id]) | |
63 | return -EINVAL; | |
64 | ||
65 | hup[p->id] = NULL; | |
0372a662 | 66 | |
1da177e4 LT |
67 | return 0; |
68 | } | |
69 | ||
4ee7ef19 | 70 | static const struct hci_uart_proto *hci_uart_get_proto(unsigned int id) |
1da177e4 LT |
71 | { |
72 | if (id >= HCI_UART_MAX_PROTO) | |
73 | return NULL; | |
0372a662 | 74 | |
1da177e4 LT |
75 | return hup[id]; |
76 | } | |
77 | ||
78 | static inline void hci_uart_tx_complete(struct hci_uart *hu, int pkt_type) | |
79 | { | |
80 | struct hci_dev *hdev = hu->hdev; | |
0372a662 | 81 | |
1da177e4 LT |
82 | /* Update HCI stat counters */ |
83 | switch (pkt_type) { | |
84 | case HCI_COMMAND_PKT: | |
85 | hdev->stat.cmd_tx++; | |
86 | break; | |
87 | ||
88 | case HCI_ACLDATA_PKT: | |
89 | hdev->stat.acl_tx++; | |
90 | break; | |
91 | ||
92 | case HCI_SCODATA_PKT: | |
7f8f2729 | 93 | hdev->stat.sco_tx++; |
1da177e4 LT |
94 | break; |
95 | } | |
96 | } | |
97 | ||
98 | static inline struct sk_buff *hci_uart_dequeue(struct hci_uart *hu) | |
99 | { | |
100 | struct sk_buff *skb = hu->tx_skb; | |
0372a662 | 101 | |
048e1bd3 | 102 | if (!skb) { |
67d2f878 | 103 | percpu_down_read(&hu->proto_lock); |
dec2c928 | 104 | |
048e1bd3 DJ |
105 | if (test_bit(HCI_UART_PROTO_READY, &hu->flags)) |
106 | skb = hu->proto->dequeue(hu); | |
dec2c928 | 107 | |
67d2f878 | 108 | percpu_up_read(&hu->proto_lock); |
048e1bd3 | 109 | } else { |
1da177e4 | 110 | hu->tx_skb = NULL; |
048e1bd3 | 111 | } |
0372a662 | 112 | |
1da177e4 LT |
113 | return skb; |
114 | } | |
115 | ||
116 | int hci_uart_tx_wakeup(struct hci_uart *hu) | |
117 | { | |
67d2f878 RT |
118 | /* This may be called in an IRQ context, so we can't sleep. Therefore |
119 | * we try to acquire the lock only, and if that fails we assume the | |
120 | * tty is being closed because that is the only time the write lock is | |
121 | * acquired. If, however, at some point in the future the write lock | |
122 | * is also acquired in other situations, then this must be revisited. | |
123 | */ | |
124 | if (!percpu_down_read_trylock(&hu->proto_lock)) | |
125 | return 0; | |
dec2c928 | 126 | |
2d6f1da1 | 127 | if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) |
dec2c928 | 128 | goto no_schedule; |
2d6f1da1 | 129 | |
1da177e4 LT |
130 | if (test_and_set_bit(HCI_UART_SENDING, &hu->tx_state)) { |
131 | set_bit(HCI_UART_TX_WAKEUP, &hu->tx_state); | |
dec2c928 | 132 | goto no_schedule; |
1da177e4 LT |
133 | } |
134 | ||
135 | BT_DBG(""); | |
136 | ||
da64c27d FB |
137 | schedule_work(&hu->write_work); |
138 | ||
dec2c928 | 139 | no_schedule: |
67d2f878 | 140 | percpu_up_read(&hu->proto_lock); |
dec2c928 | 141 | |
da64c27d FB |
142 | return 0; |
143 | } | |
081f36a8 | 144 | EXPORT_SYMBOL_GPL(hci_uart_tx_wakeup); |
da64c27d FB |
145 | |
146 | static void hci_uart_write_work(struct work_struct *work) | |
147 | { | |
148 | struct hci_uart *hu = container_of(work, struct hci_uart, write_work); | |
149 | struct tty_struct *tty = hu->tty; | |
150 | struct hci_dev *hdev = hu->hdev; | |
151 | struct sk_buff *skb; | |
152 | ||
153 | /* REVISIT: should we cope with bad skbs or ->write() returning | |
154 | * and error value ? | |
155 | */ | |
156 | ||
1da177e4 LT |
157 | restart: |
158 | clear_bit(HCI_UART_TX_WAKEUP, &hu->tx_state); | |
159 | ||
160 | while ((skb = hci_uart_dequeue(hu))) { | |
161 | int len; | |
0372a662 | 162 | |
1da177e4 | 163 | set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); |
f34d7a5b | 164 | len = tty->ops->write(tty, skb->data, skb->len); |
1da177e4 LT |
165 | hdev->stat.byte_tx += len; |
166 | ||
167 | skb_pull(skb, len); | |
168 | if (skb->len) { | |
169 | hu->tx_skb = skb; | |
170 | break; | |
171 | } | |
0372a662 | 172 | |
618e8bc2 | 173 | hci_uart_tx_complete(hu, hci_skb_pkt_type(skb)); |
1da177e4 | 174 | kfree_skb(skb); |
0372a662 MH |
175 | } |
176 | ||
1da177e4 LT |
177 | if (test_bit(HCI_UART_TX_WAKEUP, &hu->tx_state)) |
178 | goto restart; | |
179 | ||
180 | clear_bit(HCI_UART_SENDING, &hu->tx_state); | |
40fbb915 | 181 | wake_up_bit(&hu->tx_state, HCI_UART_SENDING); |
1da177e4 LT |
182 | } |
183 | ||
fdee6d8f | 184 | void hci_uart_init_work(struct work_struct *work) |
9f2aee84 JH |
185 | { |
186 | struct hci_uart *hu = container_of(work, struct hci_uart, init_ready); | |
187 | int err; | |
a225b8c7 | 188 | struct hci_dev *hdev; |
9f2aee84 JH |
189 | |
190 | if (!test_and_clear_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags)) | |
191 | return; | |
192 | ||
193 | err = hci_register_dev(hu->hdev); | |
194 | if (err < 0) { | |
195 | BT_ERR("Can't register HCI device"); | |
32a7b4cb JC |
196 | clear_bit(HCI_UART_PROTO_READY, &hu->flags); |
197 | hu->proto->close(hu); | |
a225b8c7 | 198 | hdev = hu->hdev; |
9f2aee84 | 199 | hu->hdev = NULL; |
a225b8c7 | 200 | hci_free_dev(hdev); |
cb926520 | 201 | return; |
9f2aee84 JH |
202 | } |
203 | ||
204 | set_bit(HCI_UART_REGISTERED, &hu->flags); | |
205 | } | |
206 | ||
207 | int hci_uart_init_ready(struct hci_uart *hu) | |
208 | { | |
209 | if (!test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags)) | |
210 | return -EALREADY; | |
211 | ||
212 | schedule_work(&hu->init_ready); | |
213 | ||
214 | return 0; | |
215 | } | |
216 | ||
40fbb915 SH |
217 | int hci_uart_wait_until_sent(struct hci_uart *hu) |
218 | { | |
219 | return wait_on_bit_timeout(&hu->tx_state, HCI_UART_SENDING, | |
220 | TASK_INTERRUPTIBLE, | |
221 | msecs_to_jiffies(2000)); | |
222 | } | |
223 | ||
1da177e4 | 224 | /* ------- Interface to HCI layer ------ */ |
1da177e4 LT |
225 | /* Reset device */ |
226 | static int hci_uart_flush(struct hci_dev *hdev) | |
227 | { | |
155961e8 | 228 | struct hci_uart *hu = hci_get_drvdata(hdev); |
1da177e4 LT |
229 | struct tty_struct *tty = hu->tty; |
230 | ||
231 | BT_DBG("hdev %p tty %p", hdev, tty); | |
232 | ||
233 | if (hu->tx_skb) { | |
234 | kfree_skb(hu->tx_skb); hu->tx_skb = NULL; | |
235 | } | |
236 | ||
237 | /* Flush any pending characters in the driver and discipline. */ | |
238 | tty_ldisc_flush(tty); | |
f34d7a5b | 239 | tty_driver_flush_buffer(tty); |
1da177e4 | 240 | |
67d2f878 | 241 | percpu_down_read(&hu->proto_lock); |
dec2c928 | 242 | |
84cb3df0 | 243 | if (test_bit(HCI_UART_PROTO_READY, &hu->flags)) |
1da177e4 LT |
244 | hu->proto->flush(hu); |
245 | ||
67d2f878 | 246 | percpu_up_read(&hu->proto_lock); |
dec2c928 | 247 | |
1da177e4 LT |
248 | return 0; |
249 | } | |
250 | ||
412fe29f HG |
251 | /* Initialize device */ |
252 | static int hci_uart_open(struct hci_dev *hdev) | |
253 | { | |
254 | BT_DBG("%s %p", hdev->name, hdev); | |
255 | ||
256 | /* Undo clearing this from hci_uart_close() */ | |
257 | hdev->flush = hci_uart_flush; | |
258 | ||
259 | return 0; | |
260 | } | |
261 | ||
1da177e4 LT |
262 | /* Close device */ |
263 | static int hci_uart_close(struct hci_dev *hdev) | |
264 | { | |
265 | BT_DBG("hdev %p", hdev); | |
266 | ||
1da177e4 | 267 | hci_uart_flush(hdev); |
3611f4d2 | 268 | hdev->flush = NULL; |
1da177e4 LT |
269 | return 0; |
270 | } | |
271 | ||
272 | /* Send frames from HCI layer */ | |
7bd8f09f | 273 | static int hci_uart_send_frame(struct hci_dev *hdev, struct sk_buff *skb) |
1da177e4 | 274 | { |
52bc423a | 275 | struct hci_uart *hu = hci_get_drvdata(hdev); |
1da177e4 | 276 | |
618e8bc2 MH |
277 | BT_DBG("%s: type %d len %d", hdev->name, hci_skb_pkt_type(skb), |
278 | skb->len); | |
1da177e4 | 279 | |
67d2f878 | 280 | percpu_down_read(&hu->proto_lock); |
dec2c928 DJ |
281 | |
282 | if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) { | |
67d2f878 | 283 | percpu_up_read(&hu->proto_lock); |
ab00f89f | 284 | return -EUNATCH; |
dec2c928 | 285 | } |
ab00f89f | 286 | |
1da177e4 | 287 | hu->proto->enqueue(hu, skb); |
67d2f878 | 288 | percpu_up_read(&hu->proto_lock); |
1da177e4 LT |
289 | |
290 | hci_uart_tx_wakeup(hu); | |
0372a662 | 291 | |
1da177e4 LT |
292 | return 0; |
293 | } | |
294 | ||
2a973dfa IF |
295 | /* Flow control or un-flow control the device */ |
296 | void hci_uart_set_flow_control(struct hci_uart *hu, bool enable) | |
297 | { | |
298 | struct tty_struct *tty = hu->tty; | |
299 | struct ktermios ktermios; | |
300 | int status; | |
301 | unsigned int set = 0; | |
302 | unsigned int clear = 0; | |
303 | ||
7841d554 HG |
304 | if (hu->serdev) { |
305 | serdev_device_set_flow_control(hu->serdev, !enable); | |
306 | serdev_device_set_rts(hu->serdev, !enable); | |
307 | return; | |
308 | } | |
309 | ||
2a973dfa IF |
310 | if (enable) { |
311 | /* Disable hardware flow control */ | |
312 | ktermios = tty->termios; | |
313 | ktermios.c_cflag &= ~CRTSCTS; | |
314 | status = tty_set_termios(tty, &ktermios); | |
315 | BT_DBG("Disabling hardware flow control: %s", | |
316 | status ? "failed" : "success"); | |
317 | ||
318 | /* Clear RTS to prevent the device from sending */ | |
319 | /* Most UARTs need OUT2 to enable interrupts */ | |
320 | status = tty->driver->ops->tiocmget(tty); | |
321 | BT_DBG("Current tiocm 0x%x", status); | |
322 | ||
323 | set &= ~(TIOCM_OUT2 | TIOCM_RTS); | |
324 | clear = ~set; | |
325 | set &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 | | |
326 | TIOCM_OUT2 | TIOCM_LOOP; | |
327 | clear &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 | | |
328 | TIOCM_OUT2 | TIOCM_LOOP; | |
329 | status = tty->driver->ops->tiocmset(tty, set, clear); | |
330 | BT_DBG("Clearing RTS: %s", status ? "failed" : "success"); | |
331 | } else { | |
332 | /* Set RTS to allow the device to send again */ | |
333 | status = tty->driver->ops->tiocmget(tty); | |
334 | BT_DBG("Current tiocm 0x%x", status); | |
335 | ||
336 | set |= (TIOCM_OUT2 | TIOCM_RTS); | |
337 | clear = ~set; | |
338 | set &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 | | |
339 | TIOCM_OUT2 | TIOCM_LOOP; | |
340 | clear &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 | | |
341 | TIOCM_OUT2 | TIOCM_LOOP; | |
342 | status = tty->driver->ops->tiocmset(tty, set, clear); | |
343 | BT_DBG("Setting RTS: %s", status ? "failed" : "success"); | |
344 | ||
345 | /* Re-enable hardware flow control */ | |
346 | ktermios = tty->termios; | |
347 | ktermios.c_cflag |= CRTSCTS; | |
348 | status = tty_set_termios(tty, &ktermios); | |
349 | BT_DBG("Enabling hardware flow control: %s", | |
350 | status ? "failed" : "success"); | |
351 | } | |
352 | } | |
353 | ||
354 | void hci_uart_set_speeds(struct hci_uart *hu, unsigned int init_speed, | |
355 | unsigned int oper_speed) | |
356 | { | |
357 | hu->init_speed = init_speed; | |
358 | hu->oper_speed = oper_speed; | |
359 | } | |
360 | ||
7721383f FD |
361 | void hci_uart_set_baudrate(struct hci_uart *hu, unsigned int speed) |
362 | { | |
363 | struct tty_struct *tty = hu->tty; | |
364 | struct ktermios ktermios; | |
365 | ||
366 | ktermios = tty->termios; | |
367 | ktermios.c_cflag &= ~CBAUD; | |
7721383f FD |
368 | tty_termios_encode_baud_rate(&ktermios, speed, speed); |
369 | ||
370 | /* tty_set_termios() return not checked as it is always 0 */ | |
371 | tty_set_termios(tty, &ktermios); | |
372 | ||
2a973dfa IF |
373 | BT_DBG("%s: New tty speeds: %d/%d", hu->hdev->name, |
374 | tty->termios.c_ispeed, tty->termios.c_ospeed); | |
7721383f FD |
375 | } |
376 | ||
eb173809 LP |
377 | static int hci_uart_setup(struct hci_dev *hdev) |
378 | { | |
379 | struct hci_uart *hu = hci_get_drvdata(hdev); | |
fb2ce8d1 MH |
380 | struct hci_rp_read_local_version *ver; |
381 | struct sk_buff *skb; | |
2a973dfa | 382 | unsigned int speed; |
7721383f FD |
383 | int err; |
384 | ||
2a973dfa | 385 | /* Init speed if any */ |
960ef1d7 | 386 | if (hu->init_speed) |
2a973dfa | 387 | speed = hu->init_speed; |
960ef1d7 FD |
388 | else if (hu->proto->init_speed) |
389 | speed = hu->proto->init_speed; | |
2a973dfa IF |
390 | else |
391 | speed = 0; | |
392 | ||
393 | if (speed) | |
394 | hci_uart_set_baudrate(hu, speed); | |
395 | ||
396 | /* Operational speed if any */ | |
960ef1d7 | 397 | if (hu->oper_speed) |
2a973dfa | 398 | speed = hu->oper_speed; |
960ef1d7 FD |
399 | else if (hu->proto->oper_speed) |
400 | speed = hu->proto->oper_speed; | |
2a973dfa IF |
401 | else |
402 | speed = 0; | |
7721383f | 403 | |
2a973dfa IF |
404 | if (hu->proto->set_baudrate && speed) { |
405 | err = hu->proto->set_baudrate(hu, speed); | |
7721383f | 406 | if (!err) |
2a973dfa | 407 | hci_uart_set_baudrate(hu, speed); |
7721383f | 408 | } |
eb173809 LP |
409 | |
410 | if (hu->proto->setup) | |
411 | return hu->proto->setup(hu); | |
412 | ||
fb2ce8d1 MH |
413 | if (!test_bit(HCI_UART_VND_DETECT, &hu->hdev_flags)) |
414 | return 0; | |
415 | ||
416 | skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_VERSION, 0, NULL, | |
417 | HCI_INIT_TIMEOUT); | |
418 | if (IS_ERR(skb)) { | |
419 | BT_ERR("%s: Reading local version information failed (%ld)", | |
420 | hdev->name, PTR_ERR(skb)); | |
421 | return 0; | |
422 | } | |
423 | ||
424 | if (skb->len != sizeof(*ver)) { | |
425 | BT_ERR("%s: Event length mismatch for version information", | |
426 | hdev->name); | |
427 | goto done; | |
428 | } | |
429 | ||
430 | ver = (struct hci_rp_read_local_version *)skb->data; | |
431 | ||
432 | switch (le16_to_cpu(ver->manufacturer)) { | |
16e3887f MH |
433 | #ifdef CONFIG_BT_HCIUART_INTEL |
434 | case 2: | |
bca03c95 MH |
435 | hdev->set_bdaddr = btintel_set_bdaddr; |
436 | btintel_check_bdaddr(hdev); | |
16e3887f | 437 | break; |
e9a2dd26 MH |
438 | #endif |
439 | #ifdef CONFIG_BT_HCIUART_BCM | |
440 | case 15: | |
3e0ac12a MH |
441 | hdev->set_bdaddr = btbcm_set_bdaddr; |
442 | btbcm_check_bdaddr(hdev); | |
e9a2dd26 | 443 | break; |
16e3887f | 444 | #endif |
d36dfb3e FE |
445 | default: |
446 | break; | |
fb2ce8d1 MH |
447 | } |
448 | ||
449 | done: | |
450 | kfree_skb(skb); | |
eb173809 LP |
451 | return 0; |
452 | } | |
453 | ||
1da177e4 LT |
454 | /* ------ LDISC part ------ */ |
455 | /* hci_uart_tty_open | |
1687dfc3 | 456 | * |
1da177e4 LT |
457 | * Called when line discipline changed to HCI_UART. |
458 | * | |
459 | * Arguments: | |
460 | * tty pointer to tty info structure | |
1687dfc3 | 461 | * Return Value: |
1da177e4 LT |
462 | * 0 if success, otherwise error code |
463 | */ | |
464 | static int hci_uart_tty_open(struct tty_struct *tty) | |
465 | { | |
f327b340 | 466 | struct hci_uart *hu; |
1da177e4 LT |
467 | |
468 | BT_DBG("tty %p", tty); | |
469 | ||
c19483cc | 470 | /* Error if the tty has no write op instead of leaving an exploitable |
d98422cb DR |
471 | * hole |
472 | */ | |
c19483cc AC |
473 | if (tty->ops->write == NULL) |
474 | return -EOPNOTSUPP; | |
475 | ||
a08b15e6 VI |
476 | hu = kzalloc(sizeof(struct hci_uart), GFP_KERNEL); |
477 | if (!hu) { | |
7785162c | 478 | BT_ERR("Can't allocate control structure"); |
1da177e4 LT |
479 | return -ENFILE; |
480 | } | |
0372a662 | 481 | |
1da177e4 LT |
482 | tty->disc_data = hu; |
483 | hu->tty = tty; | |
33f0f88f | 484 | tty->receive_room = 65536; |
1da177e4 | 485 | |
aeac3014 SR |
486 | /* disable alignment support by default */ |
487 | hu->alignment = 1; | |
488 | hu->padding = 0; | |
489 | ||
9f2aee84 | 490 | INIT_WORK(&hu->init_ready, hci_uart_init_work); |
da64c27d | 491 | INIT_WORK(&hu->write_work, hci_uart_write_work); |
9f2aee84 | 492 | |
67d2f878 | 493 | percpu_init_rwsem(&hu->proto_lock); |
dec2c928 | 494 | |
e6e981c7 | 495 | /* Flush any pending characters in the driver */ |
f34d7a5b | 496 | tty_driver_flush_buffer(tty); |
1da177e4 LT |
497 | |
498 | return 0; | |
499 | } | |
500 | ||
501 | /* hci_uart_tty_close() | |
502 | * | |
503 | * Called when the line discipline is changed to something | |
504 | * else, the tty is closed, or the tty detects a hangup. | |
505 | */ | |
506 | static void hci_uart_tty_close(struct tty_struct *tty) | |
507 | { | |
dfe19d28 | 508 | struct hci_uart *hu = tty->disc_data; |
dac670b9 | 509 | struct hci_dev *hdev; |
1da177e4 LT |
510 | |
511 | BT_DBG("tty %p", tty); | |
512 | ||
513 | /* Detach from the tty */ | |
514 | tty->disc_data = NULL; | |
515 | ||
dac670b9 JH |
516 | if (!hu) |
517 | return; | |
22ad4203 | 518 | |
dac670b9 JH |
519 | hdev = hu->hdev; |
520 | if (hdev) | |
521 | hci_uart_close(hdev); | |
1da177e4 | 522 | |
dec2c928 | 523 | if (test_bit(HCI_UART_PROTO_READY, &hu->flags)) { |
67d2f878 | 524 | percpu_down_write(&hu->proto_lock); |
dec2c928 | 525 | clear_bit(HCI_UART_PROTO_READY, &hu->flags); |
67d2f878 | 526 | percpu_up_write(&hu->proto_lock); |
dec2c928 | 527 | |
0338b1b3 RT |
528 | cancel_work_sync(&hu->write_work); |
529 | ||
dac670b9 | 530 | if (hdev) { |
9f2aee84 JH |
531 | if (test_bit(HCI_UART_REGISTERED, &hu->flags)) |
532 | hci_unregister_dev(hdev); | |
dac670b9 | 533 | hci_free_dev(hdev); |
1da177e4 | 534 | } |
dac670b9 | 535 | hu->proto->close(hu); |
1da177e4 | 536 | } |
84cb3df0 | 537 | clear_bit(HCI_UART_PROTO_SET, &hu->flags); |
dac670b9 | 538 | |
e6a57d22 HZ |
539 | percpu_free_rwsem(&hu->proto_lock); |
540 | ||
dac670b9 | 541 | kfree(hu); |
1da177e4 LT |
542 | } |
543 | ||
544 | /* hci_uart_tty_wakeup() | |
545 | * | |
546 | * Callback for transmit wakeup. Called when low level | |
547 | * device driver can accept more send data. | |
548 | * | |
549 | * Arguments: tty pointer to associated tty instance data | |
550 | * Return Value: None | |
551 | */ | |
552 | static void hci_uart_tty_wakeup(struct tty_struct *tty) | |
553 | { | |
dfe19d28 | 554 | struct hci_uart *hu = tty->disc_data; |
1da177e4 LT |
555 | |
556 | BT_DBG(""); | |
557 | ||
558 | if (!hu) | |
559 | return; | |
560 | ||
561 | clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); | |
562 | ||
563 | if (tty != hu->tty) | |
564 | return; | |
565 | ||
84cb3df0 | 566 | if (test_bit(HCI_UART_PROTO_READY, &hu->flags)) |
1da177e4 LT |
567 | hci_uart_tx_wakeup(hu); |
568 | } | |
569 | ||
1da177e4 | 570 | /* hci_uart_tty_receive() |
1687dfc3 | 571 | * |
1da177e4 LT |
572 | * Called by tty low level driver when receive data is |
573 | * available. | |
1687dfc3 | 574 | * |
1da177e4 LT |
575 | * Arguments: tty pointer to tty isntance data |
576 | * data pointer to received data | |
577 | * flags pointer to flags for data | |
578 | * count count of received data in bytes | |
1687dfc3 | 579 | * |
55db4c64 | 580 | * Return Value: None |
1da177e4 | 581 | */ |
facf5225 MH |
582 | static void hci_uart_tty_receive(struct tty_struct *tty, const u8 *data, |
583 | char *flags, int count) | |
1da177e4 | 584 | { |
dfe19d28 | 585 | struct hci_uart *hu = tty->disc_data; |
0372a662 | 586 | |
1da177e4 | 587 | if (!hu || tty != hu->tty) |
55db4c64 | 588 | return; |
1da177e4 | 589 | |
67d2f878 | 590 | percpu_down_read(&hu->proto_lock); |
dec2c928 DJ |
591 | |
592 | if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) { | |
67d2f878 | 593 | percpu_up_read(&hu->proto_lock); |
55db4c64 | 594 | return; |
dec2c928 | 595 | } |
0372a662 | 596 | |
7649faff FD |
597 | /* It does not need a lock here as it is already protected by a mutex in |
598 | * tty caller | |
599 | */ | |
9d1c40eb | 600 | hu->proto->recv(hu, data, count); |
67d2f878 | 601 | percpu_up_read(&hu->proto_lock); |
788f0923 CP |
602 | |
603 | if (hu->hdev) | |
604 | hu->hdev->stat.byte_rx += count; | |
605 | ||
39c2e60f | 606 | tty_unthrottle(tty); |
1da177e4 LT |
607 | } |
608 | ||
609 | static int hci_uart_register_dev(struct hci_uart *hu) | |
610 | { | |
611 | struct hci_dev *hdev; | |
32a7b4cb | 612 | int err; |
1da177e4 LT |
613 | |
614 | BT_DBG(""); | |
615 | ||
616 | /* Initialize and register HCI device */ | |
617 | hdev = hci_alloc_dev(); | |
618 | if (!hdev) { | |
619 | BT_ERR("Can't allocate HCI device"); | |
620 | return -ENOMEM; | |
621 | } | |
622 | ||
623 | hu->hdev = hdev; | |
624 | ||
c13854ce | 625 | hdev->bus = HCI_UART; |
155961e8 | 626 | hci_set_drvdata(hdev, hu); |
1da177e4 | 627 | |
aee61f7a MH |
628 | /* Only when vendor specific setup callback is provided, consider |
629 | * the manufacturer information valid. This avoids filling in the | |
630 | * value for Ericsson when nothing is specified. | |
631 | */ | |
632 | if (hu->proto->setup) | |
633 | hdev->manufacturer = hu->proto->manufacturer; | |
634 | ||
1da177e4 LT |
635 | hdev->open = hci_uart_open; |
636 | hdev->close = hci_uart_close; | |
637 | hdev->flush = hci_uart_flush; | |
638 | hdev->send = hci_uart_send_frame; | |
eb173809 | 639 | hdev->setup = hci_uart_setup; |
6935e0f5 | 640 | SET_HCIDEV_DEV(hdev, hu->tty->dev); |
1da177e4 | 641 | |
63c7d09c JH |
642 | if (test_bit(HCI_UART_RAW_DEVICE, &hu->hdev_flags)) |
643 | set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks); | |
644 | ||
6afd04ad MH |
645 | if (test_bit(HCI_UART_EXT_CONFIG, &hu->hdev_flags)) |
646 | set_bit(HCI_QUIRK_EXTERNAL_CONFIG, &hdev->quirks); | |
647 | ||
a55e1f38 | 648 | if (!test_bit(HCI_UART_RESET_ON_INIT, &hu->hdev_flags)) |
a6c511c6 | 649 | set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks); |
a55e1f38 | 650 | |
8a7a3fd6 MH |
651 | if (test_bit(HCI_UART_CREATE_AMP, &hu->hdev_flags)) |
652 | hdev->dev_type = HCI_AMP; | |
653 | else | |
ca8bee5d | 654 | hdev->dev_type = HCI_PRIMARY; |
8a7a3fd6 | 655 | |
32a7b4cb JC |
656 | /* Only call open() for the protocol after hdev is fully initialized as |
657 | * open() (or a timer/workqueue it starts) may attempt to reference it. | |
658 | */ | |
659 | err = hu->proto->open(hu); | |
660 | if (err) { | |
661 | hu->hdev = NULL; | |
662 | hci_free_dev(hdev); | |
663 | return err; | |
664 | } | |
665 | ||
9f2aee84 JH |
666 | if (test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags)) |
667 | return 0; | |
668 | ||
1da177e4 LT |
669 | if (hci_register_dev(hdev) < 0) { |
670 | BT_ERR("Can't register HCI device"); | |
32a7b4cb | 671 | hu->proto->close(hu); |
a225b8c7 | 672 | hu->hdev = NULL; |
1da177e4 LT |
673 | hci_free_dev(hdev); |
674 | return -ENODEV; | |
675 | } | |
676 | ||
9f2aee84 JH |
677 | set_bit(HCI_UART_REGISTERED, &hu->flags); |
678 | ||
1da177e4 LT |
679 | return 0; |
680 | } | |
681 | ||
682 | static int hci_uart_set_proto(struct hci_uart *hu, int id) | |
683 | { | |
4ee7ef19 | 684 | const struct hci_uart_proto *p; |
0372a662 MH |
685 | int err; |
686 | ||
1da177e4 LT |
687 | p = hci_uart_get_proto(id); |
688 | if (!p) | |
689 | return -EPROTONOSUPPORT; | |
690 | ||
1da177e4 LT |
691 | hu->proto = p; |
692 | ||
693 | err = hci_uart_register_dev(hu); | |
694 | if (err) { | |
1da177e4 LT |
695 | return err; |
696 | } | |
0372a662 | 697 | |
56897b21 | 698 | set_bit(HCI_UART_PROTO_READY, &hu->flags); |
1da177e4 LT |
699 | return 0; |
700 | } | |
701 | ||
bb72bd68 MH |
702 | static int hci_uart_set_flags(struct hci_uart *hu, unsigned long flags) |
703 | { | |
704 | unsigned long valid_flags = BIT(HCI_UART_RAW_DEVICE) | | |
705 | BIT(HCI_UART_RESET_ON_INIT) | | |
706 | BIT(HCI_UART_CREATE_AMP) | | |
6afd04ad | 707 | BIT(HCI_UART_INIT_PENDING) | |
fb2ce8d1 MH |
708 | BIT(HCI_UART_EXT_CONFIG) | |
709 | BIT(HCI_UART_VND_DETECT); | |
bb72bd68 | 710 | |
41533fe5 | 711 | if (flags & ~valid_flags) |
bb72bd68 MH |
712 | return -EINVAL; |
713 | ||
714 | hu->hdev_flags = flags; | |
715 | ||
716 | return 0; | |
717 | } | |
718 | ||
1da177e4 LT |
719 | /* hci_uart_tty_ioctl() |
720 | * | |
721 | * Process IOCTL system call for the tty device. | |
722 | * | |
723 | * Arguments: | |
724 | * | |
725 | * tty pointer to tty instance data | |
726 | * file pointer to open file object for device | |
727 | * cmd IOCTL command code | |
728 | * arg argument for IOCTL call (cmd dependent) | |
729 | * | |
730 | * Return Value: Command dependent | |
731 | */ | |
facf5225 MH |
732 | static int hci_uart_tty_ioctl(struct tty_struct *tty, struct file *file, |
733 | unsigned int cmd, unsigned long arg) | |
1da177e4 | 734 | { |
dfe19d28 | 735 | struct hci_uart *hu = tty->disc_data; |
1da177e4 LT |
736 | int err = 0; |
737 | ||
738 | BT_DBG(""); | |
739 | ||
740 | /* Verify the status of the device */ | |
741 | if (!hu) | |
742 | return -EBADF; | |
743 | ||
744 | switch (cmd) { | |
745 | case HCIUARTSETPROTO: | |
746 | if (!test_and_set_bit(HCI_UART_PROTO_SET, &hu->flags)) { | |
747 | err = hci_uart_set_proto(hu, arg); | |
05650694 | 748 | if (err) |
1da177e4 | 749 | clear_bit(HCI_UART_PROTO_SET, &hu->flags); |
0372a662 | 750 | } else |
05650694 | 751 | err = -EBUSY; |
c33be3c3 | 752 | break; |
1da177e4 LT |
753 | |
754 | case HCIUARTGETPROTO: | |
755 | if (test_bit(HCI_UART_PROTO_SET, &hu->flags)) | |
05650694 VR |
756 | err = hu->proto->id; |
757 | else | |
758 | err = -EUNATCH; | |
759 | break; | |
0372a662 | 760 | |
d2158744 | 761 | case HCIUARTGETDEVICE: |
c7e0c141 | 762 | if (test_bit(HCI_UART_REGISTERED, &hu->flags)) |
05650694 VR |
763 | err = hu->hdev->id; |
764 | else | |
765 | err = -EUNATCH; | |
766 | break; | |
d2158744 | 767 | |
63c7d09c JH |
768 | case HCIUARTSETFLAGS: |
769 | if (test_bit(HCI_UART_PROTO_SET, &hu->flags)) | |
05650694 VR |
770 | err = -EBUSY; |
771 | else | |
772 | err = hci_uart_set_flags(hu, arg); | |
63c7d09c JH |
773 | break; |
774 | ||
775 | case HCIUARTGETFLAGS: | |
05650694 VR |
776 | err = hu->hdev_flags; |
777 | break; | |
63c7d09c | 778 | |
1da177e4 | 779 | default: |
47afa7a5 | 780 | err = n_tty_ioctl_helper(tty, file, cmd, arg); |
1da177e4 | 781 | break; |
a20890d0 | 782 | } |
1da177e4 LT |
783 | |
784 | return err; | |
785 | } | |
786 | ||
787 | /* | |
788 | * We don't provide read/write/poll interface for user space. | |
789 | */ | |
0372a662 | 790 | static ssize_t hci_uart_tty_read(struct tty_struct *tty, struct file *file, |
facf5225 | 791 | unsigned char __user *buf, size_t nr) |
1da177e4 LT |
792 | { |
793 | return 0; | |
794 | } | |
0372a662 MH |
795 | |
796 | static ssize_t hci_uart_tty_write(struct tty_struct *tty, struct file *file, | |
facf5225 | 797 | const unsigned char *data, size_t count) |
1da177e4 LT |
798 | { |
799 | return 0; | |
800 | } | |
0372a662 | 801 | |
afc9a42b | 802 | static __poll_t hci_uart_tty_poll(struct tty_struct *tty, |
facf5225 | 803 | struct file *filp, poll_table *wait) |
1da177e4 LT |
804 | { |
805 | return 0; | |
806 | } | |
807 | ||
1da177e4 LT |
808 | static int __init hci_uart_init(void) |
809 | { | |
a352def2 | 810 | static struct tty_ldisc_ops hci_uart_ldisc; |
1da177e4 LT |
811 | int err; |
812 | ||
813 | BT_INFO("HCI UART driver ver %s", VERSION); | |
814 | ||
815 | /* Register the tty discipline */ | |
816 | ||
acf50c5f | 817 | memset(&hci_uart_ldisc, 0, sizeof(hci_uart_ldisc)); |
0372a662 MH |
818 | hci_uart_ldisc.magic = TTY_LDISC_MAGIC; |
819 | hci_uart_ldisc.name = "n_hci"; | |
820 | hci_uart_ldisc.open = hci_uart_tty_open; | |
821 | hci_uart_ldisc.close = hci_uart_tty_close; | |
822 | hci_uart_ldisc.read = hci_uart_tty_read; | |
823 | hci_uart_ldisc.write = hci_uart_tty_write; | |
824 | hci_uart_ldisc.ioctl = hci_uart_tty_ioctl; | |
f0193d3e | 825 | hci_uart_ldisc.compat_ioctl = hci_uart_tty_ioctl; |
0372a662 | 826 | hci_uart_ldisc.poll = hci_uart_tty_poll; |
0372a662 MH |
827 | hci_uart_ldisc.receive_buf = hci_uart_tty_receive; |
828 | hci_uart_ldisc.write_wakeup = hci_uart_tty_wakeup; | |
829 | hci_uart_ldisc.owner = THIS_MODULE; | |
1da177e4 | 830 | |
a08b15e6 VI |
831 | err = tty_register_ldisc(N_HCI, &hci_uart_ldisc); |
832 | if (err) { | |
1da177e4 LT |
833 | BT_ERR("HCI line discipline registration failed. (%d)", err); |
834 | return err; | |
835 | } | |
836 | ||
837 | #ifdef CONFIG_BT_HCIUART_H4 | |
838 | h4_init(); | |
839 | #endif | |
840 | #ifdef CONFIG_BT_HCIUART_BCSP | |
841 | bcsp_init(); | |
842 | #endif | |
166d2f6a OBC |
843 | #ifdef CONFIG_BT_HCIUART_LL |
844 | ll_init(); | |
845 | #endif | |
b3190df6 SS |
846 | #ifdef CONFIG_BT_HCIUART_ATH3K |
847 | ath_init(); | |
848 | #endif | |
7dec65c8 JH |
849 | #ifdef CONFIG_BT_HCIUART_3WIRE |
850 | h5_init(); | |
851 | #endif | |
ca93cee5 LP |
852 | #ifdef CONFIG_BT_HCIUART_INTEL |
853 | intel_init(); | |
854 | #endif | |
bdd8818e MH |
855 | #ifdef CONFIG_BT_HCIUART_BCM |
856 | bcm_init(); | |
857 | #endif | |
0ff252c1 BYTK |
858 | #ifdef CONFIG_BT_HCIUART_QCA |
859 | qca_init(); | |
860 | #endif | |
395174bb LP |
861 | #ifdef CONFIG_BT_HCIUART_AG6XX |
862 | ag6xx_init(); | |
863 | #endif | |
162f812f LP |
864 | #ifdef CONFIG_BT_HCIUART_MRVL |
865 | mrvl_init(); | |
866 | #endif | |
166d2f6a | 867 | |
1da177e4 LT |
868 | return 0; |
869 | } | |
870 | ||
871 | static void __exit hci_uart_exit(void) | |
872 | { | |
873 | int err; | |
874 | ||
875 | #ifdef CONFIG_BT_HCIUART_H4 | |
876 | h4_deinit(); | |
877 | #endif | |
878 | #ifdef CONFIG_BT_HCIUART_BCSP | |
879 | bcsp_deinit(); | |
880 | #endif | |
166d2f6a OBC |
881 | #ifdef CONFIG_BT_HCIUART_LL |
882 | ll_deinit(); | |
883 | #endif | |
b3190df6 SS |
884 | #ifdef CONFIG_BT_HCIUART_ATH3K |
885 | ath_deinit(); | |
886 | #endif | |
7dec65c8 JH |
887 | #ifdef CONFIG_BT_HCIUART_3WIRE |
888 | h5_deinit(); | |
889 | #endif | |
ca93cee5 LP |
890 | #ifdef CONFIG_BT_HCIUART_INTEL |
891 | intel_deinit(); | |
892 | #endif | |
bdd8818e MH |
893 | #ifdef CONFIG_BT_HCIUART_BCM |
894 | bcm_deinit(); | |
895 | #endif | |
0ff252c1 BYTK |
896 | #ifdef CONFIG_BT_HCIUART_QCA |
897 | qca_deinit(); | |
898 | #endif | |
395174bb LP |
899 | #ifdef CONFIG_BT_HCIUART_AG6XX |
900 | ag6xx_deinit(); | |
901 | #endif | |
162f812f LP |
902 | #ifdef CONFIG_BT_HCIUART_MRVL |
903 | mrvl_deinit(); | |
904 | #endif | |
1da177e4 LT |
905 | |
906 | /* Release tty registration of line discipline */ | |
a08b15e6 VI |
907 | err = tty_unregister_ldisc(N_HCI); |
908 | if (err) | |
1da177e4 LT |
909 | BT_ERR("Can't unregister HCI line discipline (%d)", err); |
910 | } | |
911 | ||
912 | module_init(hci_uart_init); | |
913 | module_exit(hci_uart_exit); | |
914 | ||
63fbd24e | 915 | MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); |
1da177e4 LT |
916 | MODULE_DESCRIPTION("Bluetooth HCI UART driver ver " VERSION); |
917 | MODULE_VERSION(VERSION); | |
918 | MODULE_LICENSE("GPL"); | |
919 | MODULE_ALIAS_LDISC(N_HCI); |