Commit | Line | Data |
---|---|---|
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 | |
afe0b1c8 CC |
130 | set_bit(HCI_UART_TX_WAKEUP, &hu->tx_state); |
131 | if (test_and_set_bit(HCI_UART_SENDING, &hu->tx_state)) | |
dec2c928 | 132 | goto no_schedule; |
1da177e4 LT |
133 | |
134 | BT_DBG(""); | |
135 | ||
da64c27d FB |
136 | schedule_work(&hu->write_work); |
137 | ||
dec2c928 | 138 | no_schedule: |
67d2f878 | 139 | percpu_up_read(&hu->proto_lock); |
dec2c928 | 140 | |
da64c27d FB |
141 | return 0; |
142 | } | |
081f36a8 | 143 | EXPORT_SYMBOL_GPL(hci_uart_tx_wakeup); |
da64c27d FB |
144 | |
145 | static void hci_uart_write_work(struct work_struct *work) | |
146 | { | |
147 | struct hci_uart *hu = container_of(work, struct hci_uart, write_work); | |
148 | struct tty_struct *tty = hu->tty; | |
149 | struct hci_dev *hdev = hu->hdev; | |
150 | struct sk_buff *skb; | |
151 | ||
152 | /* REVISIT: should we cope with bad skbs or ->write() returning | |
153 | * and error value ? | |
154 | */ | |
155 | ||
1da177e4 LT |
156 | restart: |
157 | clear_bit(HCI_UART_TX_WAKEUP, &hu->tx_state); | |
158 | ||
159 | while ((skb = hci_uart_dequeue(hu))) { | |
160 | int len; | |
0372a662 | 161 | |
1da177e4 | 162 | set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); |
f34d7a5b | 163 | len = tty->ops->write(tty, skb->data, skb->len); |
1da177e4 LT |
164 | hdev->stat.byte_tx += len; |
165 | ||
166 | skb_pull(skb, len); | |
167 | if (skb->len) { | |
168 | hu->tx_skb = skb; | |
169 | break; | |
170 | } | |
0372a662 | 171 | |
618e8bc2 | 172 | hci_uart_tx_complete(hu, hci_skb_pkt_type(skb)); |
1da177e4 | 173 | kfree_skb(skb); |
0372a662 MH |
174 | } |
175 | ||
afe0b1c8 | 176 | clear_bit(HCI_UART_SENDING, &hu->tx_state); |
1da177e4 LT |
177 | if (test_bit(HCI_UART_TX_WAKEUP, &hu->tx_state)) |
178 | goto restart; | |
179 | ||
40fbb915 | 180 | wake_up_bit(&hu->tx_state, HCI_UART_SENDING); |
1da177e4 LT |
181 | } |
182 | ||
fdee6d8f | 183 | void hci_uart_init_work(struct work_struct *work) |
9f2aee84 JH |
184 | { |
185 | struct hci_uart *hu = container_of(work, struct hci_uart, init_ready); | |
186 | int err; | |
a225b8c7 | 187 | struct hci_dev *hdev; |
9f2aee84 JH |
188 | |
189 | if (!test_and_clear_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags)) | |
190 | return; | |
191 | ||
192 | err = hci_register_dev(hu->hdev); | |
193 | if (err < 0) { | |
194 | BT_ERR("Can't register HCI device"); | |
32a7b4cb JC |
195 | clear_bit(HCI_UART_PROTO_READY, &hu->flags); |
196 | hu->proto->close(hu); | |
a225b8c7 | 197 | hdev = hu->hdev; |
9f2aee84 | 198 | hu->hdev = NULL; |
a225b8c7 | 199 | hci_free_dev(hdev); |
cb926520 | 200 | return; |
9f2aee84 JH |
201 | } |
202 | ||
203 | set_bit(HCI_UART_REGISTERED, &hu->flags); | |
204 | } | |
205 | ||
206 | int hci_uart_init_ready(struct hci_uart *hu) | |
207 | { | |
208 | if (!test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags)) | |
209 | return -EALREADY; | |
210 | ||
211 | schedule_work(&hu->init_ready); | |
212 | ||
213 | return 0; | |
214 | } | |
215 | ||
40fbb915 SH |
216 | int hci_uart_wait_until_sent(struct hci_uart *hu) |
217 | { | |
218 | return wait_on_bit_timeout(&hu->tx_state, HCI_UART_SENDING, | |
219 | TASK_INTERRUPTIBLE, | |
220 | msecs_to_jiffies(2000)); | |
221 | } | |
222 | ||
1da177e4 | 223 | /* ------- Interface to HCI layer ------ */ |
1da177e4 LT |
224 | /* Reset device */ |
225 | static int hci_uart_flush(struct hci_dev *hdev) | |
226 | { | |
155961e8 | 227 | struct hci_uart *hu = hci_get_drvdata(hdev); |
1da177e4 LT |
228 | struct tty_struct *tty = hu->tty; |
229 | ||
230 | BT_DBG("hdev %p tty %p", hdev, tty); | |
231 | ||
232 | if (hu->tx_skb) { | |
233 | kfree_skb(hu->tx_skb); hu->tx_skb = NULL; | |
234 | } | |
235 | ||
236 | /* Flush any pending characters in the driver and discipline. */ | |
237 | tty_ldisc_flush(tty); | |
f34d7a5b | 238 | tty_driver_flush_buffer(tty); |
1da177e4 | 239 | |
67d2f878 | 240 | percpu_down_read(&hu->proto_lock); |
dec2c928 | 241 | |
84cb3df0 | 242 | if (test_bit(HCI_UART_PROTO_READY, &hu->flags)) |
1da177e4 LT |
243 | hu->proto->flush(hu); |
244 | ||
67d2f878 | 245 | percpu_up_read(&hu->proto_lock); |
dec2c928 | 246 | |
1da177e4 LT |
247 | return 0; |
248 | } | |
249 | ||
412fe29f HG |
250 | /* Initialize device */ |
251 | static int hci_uart_open(struct hci_dev *hdev) | |
252 | { | |
253 | BT_DBG("%s %p", hdev->name, hdev); | |
254 | ||
255 | /* Undo clearing this from hci_uart_close() */ | |
256 | hdev->flush = hci_uart_flush; | |
257 | ||
258 | return 0; | |
259 | } | |
260 | ||
1da177e4 LT |
261 | /* Close device */ |
262 | static int hci_uart_close(struct hci_dev *hdev) | |
263 | { | |
264 | BT_DBG("hdev %p", hdev); | |
265 | ||
1da177e4 | 266 | hci_uart_flush(hdev); |
3611f4d2 | 267 | hdev->flush = NULL; |
1da177e4 LT |
268 | return 0; |
269 | } | |
270 | ||
271 | /* Send frames from HCI layer */ | |
7bd8f09f | 272 | static int hci_uart_send_frame(struct hci_dev *hdev, struct sk_buff *skb) |
1da177e4 | 273 | { |
52bc423a | 274 | struct hci_uart *hu = hci_get_drvdata(hdev); |
1da177e4 | 275 | |
618e8bc2 MH |
276 | BT_DBG("%s: type %d len %d", hdev->name, hci_skb_pkt_type(skb), |
277 | skb->len); | |
1da177e4 | 278 | |
67d2f878 | 279 | percpu_down_read(&hu->proto_lock); |
dec2c928 DJ |
280 | |
281 | if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) { | |
67d2f878 | 282 | percpu_up_read(&hu->proto_lock); |
ab00f89f | 283 | return -EUNATCH; |
dec2c928 | 284 | } |
ab00f89f | 285 | |
1da177e4 | 286 | hu->proto->enqueue(hu, skb); |
67d2f878 | 287 | percpu_up_read(&hu->proto_lock); |
1da177e4 LT |
288 | |
289 | hci_uart_tx_wakeup(hu); | |
0372a662 | 290 | |
1da177e4 LT |
291 | return 0; |
292 | } | |
293 | ||
b36a1552 VD |
294 | /* Check the underlying device or tty has flow control support */ |
295 | bool hci_uart_has_flow_control(struct hci_uart *hu) | |
296 | { | |
297 | /* serdev nodes check if the needed operations are present */ | |
298 | if (hu->serdev) | |
299 | return true; | |
300 | ||
301 | if (hu->tty->driver->ops->tiocmget && hu->tty->driver->ops->tiocmset) | |
302 | return true; | |
303 | ||
304 | return false; | |
305 | } | |
306 | ||
2a973dfa IF |
307 | /* Flow control or un-flow control the device */ |
308 | void hci_uart_set_flow_control(struct hci_uart *hu, bool enable) | |
309 | { | |
310 | struct tty_struct *tty = hu->tty; | |
311 | struct ktermios ktermios; | |
312 | int status; | |
313 | unsigned int set = 0; | |
314 | unsigned int clear = 0; | |
315 | ||
7841d554 HG |
316 | if (hu->serdev) { |
317 | serdev_device_set_flow_control(hu->serdev, !enable); | |
318 | serdev_device_set_rts(hu->serdev, !enable); | |
319 | return; | |
320 | } | |
321 | ||
2a973dfa IF |
322 | if (enable) { |
323 | /* Disable hardware flow control */ | |
324 | ktermios = tty->termios; | |
325 | ktermios.c_cflag &= ~CRTSCTS; | |
326 | status = tty_set_termios(tty, &ktermios); | |
327 | BT_DBG("Disabling hardware flow control: %s", | |
328 | status ? "failed" : "success"); | |
329 | ||
330 | /* Clear RTS to prevent the device from sending */ | |
331 | /* Most UARTs need OUT2 to enable interrupts */ | |
332 | status = tty->driver->ops->tiocmget(tty); | |
333 | BT_DBG("Current tiocm 0x%x", status); | |
334 | ||
335 | set &= ~(TIOCM_OUT2 | TIOCM_RTS); | |
336 | clear = ~set; | |
337 | set &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 | | |
338 | TIOCM_OUT2 | TIOCM_LOOP; | |
339 | clear &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 | | |
340 | TIOCM_OUT2 | TIOCM_LOOP; | |
341 | status = tty->driver->ops->tiocmset(tty, set, clear); | |
342 | BT_DBG("Clearing RTS: %s", status ? "failed" : "success"); | |
343 | } else { | |
344 | /* Set RTS to allow the device to send again */ | |
345 | status = tty->driver->ops->tiocmget(tty); | |
346 | BT_DBG("Current tiocm 0x%x", status); | |
347 | ||
348 | set |= (TIOCM_OUT2 | TIOCM_RTS); | |
349 | clear = ~set; | |
350 | set &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 | | |
351 | TIOCM_OUT2 | TIOCM_LOOP; | |
352 | clear &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 | | |
353 | TIOCM_OUT2 | TIOCM_LOOP; | |
354 | status = tty->driver->ops->tiocmset(tty, set, clear); | |
355 | BT_DBG("Setting RTS: %s", status ? "failed" : "success"); | |
356 | ||
357 | /* Re-enable hardware flow control */ | |
358 | ktermios = tty->termios; | |
359 | ktermios.c_cflag |= CRTSCTS; | |
360 | status = tty_set_termios(tty, &ktermios); | |
361 | BT_DBG("Enabling hardware flow control: %s", | |
362 | status ? "failed" : "success"); | |
363 | } | |
364 | } | |
365 | ||
366 | void hci_uart_set_speeds(struct hci_uart *hu, unsigned int init_speed, | |
367 | unsigned int oper_speed) | |
368 | { | |
369 | hu->init_speed = init_speed; | |
370 | hu->oper_speed = oper_speed; | |
371 | } | |
372 | ||
7721383f FD |
373 | void hci_uart_set_baudrate(struct hci_uart *hu, unsigned int speed) |
374 | { | |
375 | struct tty_struct *tty = hu->tty; | |
376 | struct ktermios ktermios; | |
377 | ||
378 | ktermios = tty->termios; | |
379 | ktermios.c_cflag &= ~CBAUD; | |
7721383f FD |
380 | tty_termios_encode_baud_rate(&ktermios, speed, speed); |
381 | ||
382 | /* tty_set_termios() return not checked as it is always 0 */ | |
383 | tty_set_termios(tty, &ktermios); | |
384 | ||
2a973dfa IF |
385 | BT_DBG("%s: New tty speeds: %d/%d", hu->hdev->name, |
386 | tty->termios.c_ispeed, tty->termios.c_ospeed); | |
7721383f FD |
387 | } |
388 | ||
eb173809 LP |
389 | static int hci_uart_setup(struct hci_dev *hdev) |
390 | { | |
391 | struct hci_uart *hu = hci_get_drvdata(hdev); | |
fb2ce8d1 MH |
392 | struct hci_rp_read_local_version *ver; |
393 | struct sk_buff *skb; | |
2a973dfa | 394 | unsigned int speed; |
7721383f FD |
395 | int err; |
396 | ||
2a973dfa | 397 | /* Init speed if any */ |
960ef1d7 | 398 | if (hu->init_speed) |
2a973dfa | 399 | speed = hu->init_speed; |
960ef1d7 FD |
400 | else if (hu->proto->init_speed) |
401 | speed = hu->proto->init_speed; | |
2a973dfa IF |
402 | else |
403 | speed = 0; | |
404 | ||
405 | if (speed) | |
406 | hci_uart_set_baudrate(hu, speed); | |
407 | ||
408 | /* Operational speed if any */ | |
960ef1d7 | 409 | if (hu->oper_speed) |
2a973dfa | 410 | speed = hu->oper_speed; |
960ef1d7 FD |
411 | else if (hu->proto->oper_speed) |
412 | speed = hu->proto->oper_speed; | |
2a973dfa IF |
413 | else |
414 | speed = 0; | |
7721383f | 415 | |
2a973dfa IF |
416 | if (hu->proto->set_baudrate && speed) { |
417 | err = hu->proto->set_baudrate(hu, speed); | |
7721383f | 418 | if (!err) |
2a973dfa | 419 | hci_uart_set_baudrate(hu, speed); |
7721383f | 420 | } |
eb173809 LP |
421 | |
422 | if (hu->proto->setup) | |
423 | return hu->proto->setup(hu); | |
424 | ||
fb2ce8d1 MH |
425 | if (!test_bit(HCI_UART_VND_DETECT, &hu->hdev_flags)) |
426 | return 0; | |
427 | ||
428 | skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_VERSION, 0, NULL, | |
429 | HCI_INIT_TIMEOUT); | |
430 | if (IS_ERR(skb)) { | |
431 | BT_ERR("%s: Reading local version information failed (%ld)", | |
432 | hdev->name, PTR_ERR(skb)); | |
433 | return 0; | |
434 | } | |
435 | ||
436 | if (skb->len != sizeof(*ver)) { | |
437 | BT_ERR("%s: Event length mismatch for version information", | |
438 | hdev->name); | |
439 | goto done; | |
440 | } | |
441 | ||
442 | ver = (struct hci_rp_read_local_version *)skb->data; | |
443 | ||
444 | switch (le16_to_cpu(ver->manufacturer)) { | |
16e3887f MH |
445 | #ifdef CONFIG_BT_HCIUART_INTEL |
446 | case 2: | |
bca03c95 MH |
447 | hdev->set_bdaddr = btintel_set_bdaddr; |
448 | btintel_check_bdaddr(hdev); | |
16e3887f | 449 | break; |
e9a2dd26 MH |
450 | #endif |
451 | #ifdef CONFIG_BT_HCIUART_BCM | |
452 | case 15: | |
3e0ac12a MH |
453 | hdev->set_bdaddr = btbcm_set_bdaddr; |
454 | btbcm_check_bdaddr(hdev); | |
e9a2dd26 | 455 | break; |
16e3887f | 456 | #endif |
d36dfb3e FE |
457 | default: |
458 | break; | |
fb2ce8d1 MH |
459 | } |
460 | ||
461 | done: | |
462 | kfree_skb(skb); | |
eb173809 LP |
463 | return 0; |
464 | } | |
465 | ||
1da177e4 LT |
466 | /* ------ LDISC part ------ */ |
467 | /* hci_uart_tty_open | |
1687dfc3 | 468 | * |
1da177e4 LT |
469 | * Called when line discipline changed to HCI_UART. |
470 | * | |
471 | * Arguments: | |
472 | * tty pointer to tty info structure | |
1687dfc3 | 473 | * Return Value: |
1da177e4 LT |
474 | * 0 if success, otherwise error code |
475 | */ | |
476 | static int hci_uart_tty_open(struct tty_struct *tty) | |
477 | { | |
f327b340 | 478 | struct hci_uart *hu; |
1da177e4 LT |
479 | |
480 | BT_DBG("tty %p", tty); | |
481 | ||
c05731d0 TLSC |
482 | if (!capable(CAP_NET_ADMIN)) |
483 | return -EPERM; | |
484 | ||
c19483cc | 485 | /* Error if the tty has no write op instead of leaving an exploitable |
d98422cb DR |
486 | * hole |
487 | */ | |
c19483cc AC |
488 | if (tty->ops->write == NULL) |
489 | return -EOPNOTSUPP; | |
490 | ||
a08b15e6 VI |
491 | hu = kzalloc(sizeof(struct hci_uart), GFP_KERNEL); |
492 | if (!hu) { | |
7785162c | 493 | BT_ERR("Can't allocate control structure"); |
1da177e4 LT |
494 | return -ENFILE; |
495 | } | |
3124d320 TH |
496 | if (percpu_init_rwsem(&hu->proto_lock)) { |
497 | BT_ERR("Can't allocate semaphore structure"); | |
498 | kfree(hu); | |
499 | return -ENOMEM; | |
500 | } | |
0372a662 | 501 | |
1da177e4 LT |
502 | tty->disc_data = hu; |
503 | hu->tty = tty; | |
33f0f88f | 504 | tty->receive_room = 65536; |
1da177e4 | 505 | |
aeac3014 SR |
506 | /* disable alignment support by default */ |
507 | hu->alignment = 1; | |
508 | hu->padding = 0; | |
509 | ||
9f2aee84 | 510 | INIT_WORK(&hu->init_ready, hci_uart_init_work); |
da64c27d | 511 | INIT_WORK(&hu->write_work, hci_uart_write_work); |
9f2aee84 | 512 | |
e6e981c7 | 513 | /* Flush any pending characters in the driver */ |
f34d7a5b | 514 | tty_driver_flush_buffer(tty); |
1da177e4 LT |
515 | |
516 | return 0; | |
517 | } | |
518 | ||
519 | /* hci_uart_tty_close() | |
520 | * | |
521 | * Called when the line discipline is changed to something | |
522 | * else, the tty is closed, or the tty detects a hangup. | |
523 | */ | |
524 | static void hci_uart_tty_close(struct tty_struct *tty) | |
525 | { | |
dfe19d28 | 526 | struct hci_uart *hu = tty->disc_data; |
dac670b9 | 527 | struct hci_dev *hdev; |
1da177e4 LT |
528 | |
529 | BT_DBG("tty %p", tty); | |
530 | ||
531 | /* Detach from the tty */ | |
532 | tty->disc_data = NULL; | |
533 | ||
dac670b9 JH |
534 | if (!hu) |
535 | return; | |
22ad4203 | 536 | |
dac670b9 JH |
537 | hdev = hu->hdev; |
538 | if (hdev) | |
539 | hci_uart_close(hdev); | |
1da177e4 | 540 | |
dec2c928 | 541 | if (test_bit(HCI_UART_PROTO_READY, &hu->flags)) { |
67d2f878 | 542 | percpu_down_write(&hu->proto_lock); |
dec2c928 | 543 | clear_bit(HCI_UART_PROTO_READY, &hu->flags); |
67d2f878 | 544 | percpu_up_write(&hu->proto_lock); |
dec2c928 | 545 | |
3b799254 | 546 | cancel_work_sync(&hu->init_ready); |
0338b1b3 RT |
547 | cancel_work_sync(&hu->write_work); |
548 | ||
dac670b9 | 549 | if (hdev) { |
9f2aee84 JH |
550 | if (test_bit(HCI_UART_REGISTERED, &hu->flags)) |
551 | hci_unregister_dev(hdev); | |
dac670b9 | 552 | hci_free_dev(hdev); |
1da177e4 | 553 | } |
dac670b9 | 554 | hu->proto->close(hu); |
1da177e4 | 555 | } |
84cb3df0 | 556 | clear_bit(HCI_UART_PROTO_SET, &hu->flags); |
dac670b9 | 557 | |
e6a57d22 HZ |
558 | percpu_free_rwsem(&hu->proto_lock); |
559 | ||
dac670b9 | 560 | kfree(hu); |
1da177e4 LT |
561 | } |
562 | ||
563 | /* hci_uart_tty_wakeup() | |
564 | * | |
565 | * Callback for transmit wakeup. Called when low level | |
566 | * device driver can accept more send data. | |
567 | * | |
568 | * Arguments: tty pointer to associated tty instance data | |
569 | * Return Value: None | |
570 | */ | |
571 | static void hci_uart_tty_wakeup(struct tty_struct *tty) | |
572 | { | |
dfe19d28 | 573 | struct hci_uart *hu = tty->disc_data; |
1da177e4 LT |
574 | |
575 | BT_DBG(""); | |
576 | ||
577 | if (!hu) | |
578 | return; | |
579 | ||
580 | clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); | |
581 | ||
582 | if (tty != hu->tty) | |
583 | return; | |
584 | ||
84cb3df0 | 585 | if (test_bit(HCI_UART_PROTO_READY, &hu->flags)) |
1da177e4 LT |
586 | hci_uart_tx_wakeup(hu); |
587 | } | |
588 | ||
1da177e4 | 589 | /* hci_uart_tty_receive() |
1687dfc3 | 590 | * |
1da177e4 LT |
591 | * Called by tty low level driver when receive data is |
592 | * available. | |
1687dfc3 | 593 | * |
1da177e4 LT |
594 | * Arguments: tty pointer to tty isntance data |
595 | * data pointer to received data | |
596 | * flags pointer to flags for data | |
597 | * count count of received data in bytes | |
1687dfc3 | 598 | * |
55db4c64 | 599 | * Return Value: None |
1da177e4 | 600 | */ |
facf5225 | 601 | static void hci_uart_tty_receive(struct tty_struct *tty, const u8 *data, |
0f3dcf3b | 602 | const char *flags, int count) |
1da177e4 | 603 | { |
dfe19d28 | 604 | struct hci_uart *hu = tty->disc_data; |
0372a662 | 605 | |
1da177e4 | 606 | if (!hu || tty != hu->tty) |
55db4c64 | 607 | return; |
1da177e4 | 608 | |
67d2f878 | 609 | percpu_down_read(&hu->proto_lock); |
dec2c928 DJ |
610 | |
611 | if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) { | |
67d2f878 | 612 | percpu_up_read(&hu->proto_lock); |
55db4c64 | 613 | return; |
dec2c928 | 614 | } |
0372a662 | 615 | |
7649faff FD |
616 | /* It does not need a lock here as it is already protected by a mutex in |
617 | * tty caller | |
618 | */ | |
9d1c40eb | 619 | hu->proto->recv(hu, data, count); |
67d2f878 | 620 | percpu_up_read(&hu->proto_lock); |
788f0923 CP |
621 | |
622 | if (hu->hdev) | |
623 | hu->hdev->stat.byte_rx += count; | |
624 | ||
39c2e60f | 625 | tty_unthrottle(tty); |
1da177e4 LT |
626 | } |
627 | ||
628 | static int hci_uart_register_dev(struct hci_uart *hu) | |
629 | { | |
630 | struct hci_dev *hdev; | |
32a7b4cb | 631 | int err; |
1da177e4 LT |
632 | |
633 | BT_DBG(""); | |
634 | ||
635 | /* Initialize and register HCI device */ | |
636 | hdev = hci_alloc_dev(); | |
637 | if (!hdev) { | |
638 | BT_ERR("Can't allocate HCI device"); | |
639 | return -ENOMEM; | |
640 | } | |
641 | ||
642 | hu->hdev = hdev; | |
643 | ||
c13854ce | 644 | hdev->bus = HCI_UART; |
155961e8 | 645 | hci_set_drvdata(hdev, hu); |
1da177e4 | 646 | |
aee61f7a MH |
647 | /* Only when vendor specific setup callback is provided, consider |
648 | * the manufacturer information valid. This avoids filling in the | |
649 | * value for Ericsson when nothing is specified. | |
650 | */ | |
651 | if (hu->proto->setup) | |
652 | hdev->manufacturer = hu->proto->manufacturer; | |
653 | ||
1da177e4 LT |
654 | hdev->open = hci_uart_open; |
655 | hdev->close = hci_uart_close; | |
656 | hdev->flush = hci_uart_flush; | |
657 | hdev->send = hci_uart_send_frame; | |
eb173809 | 658 | hdev->setup = hci_uart_setup; |
6935e0f5 | 659 | SET_HCIDEV_DEV(hdev, hu->tty->dev); |
1da177e4 | 660 | |
63c7d09c JH |
661 | if (test_bit(HCI_UART_RAW_DEVICE, &hu->hdev_flags)) |
662 | set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks); | |
663 | ||
6afd04ad MH |
664 | if (test_bit(HCI_UART_EXT_CONFIG, &hu->hdev_flags)) |
665 | set_bit(HCI_QUIRK_EXTERNAL_CONFIG, &hdev->quirks); | |
666 | ||
a55e1f38 | 667 | if (!test_bit(HCI_UART_RESET_ON_INIT, &hu->hdev_flags)) |
a6c511c6 | 668 | set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks); |
a55e1f38 | 669 | |
8a7a3fd6 MH |
670 | if (test_bit(HCI_UART_CREATE_AMP, &hu->hdev_flags)) |
671 | hdev->dev_type = HCI_AMP; | |
672 | else | |
ca8bee5d | 673 | hdev->dev_type = HCI_PRIMARY; |
8a7a3fd6 | 674 | |
32a7b4cb JC |
675 | /* Only call open() for the protocol after hdev is fully initialized as |
676 | * open() (or a timer/workqueue it starts) may attempt to reference it. | |
677 | */ | |
678 | err = hu->proto->open(hu); | |
679 | if (err) { | |
680 | hu->hdev = NULL; | |
681 | hci_free_dev(hdev); | |
682 | return err; | |
683 | } | |
684 | ||
9f2aee84 JH |
685 | if (test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags)) |
686 | return 0; | |
687 | ||
1da177e4 LT |
688 | if (hci_register_dev(hdev) < 0) { |
689 | BT_ERR("Can't register HCI device"); | |
32a7b4cb | 690 | hu->proto->close(hu); |
a225b8c7 | 691 | hu->hdev = NULL; |
1da177e4 LT |
692 | hci_free_dev(hdev); |
693 | return -ENODEV; | |
694 | } | |
695 | ||
9f2aee84 JH |
696 | set_bit(HCI_UART_REGISTERED, &hu->flags); |
697 | ||
1da177e4 LT |
698 | return 0; |
699 | } | |
700 | ||
701 | static int hci_uart_set_proto(struct hci_uart *hu, int id) | |
702 | { | |
4ee7ef19 | 703 | const struct hci_uart_proto *p; |
0372a662 MH |
704 | int err; |
705 | ||
1da177e4 LT |
706 | p = hci_uart_get_proto(id); |
707 | if (!p) | |
708 | return -EPROTONOSUPPORT; | |
709 | ||
1da177e4 LT |
710 | hu->proto = p; |
711 | ||
712 | err = hci_uart_register_dev(hu); | |
713 | if (err) { | |
1da177e4 LT |
714 | return err; |
715 | } | |
0372a662 | 716 | |
56897b21 | 717 | set_bit(HCI_UART_PROTO_READY, &hu->flags); |
1da177e4 LT |
718 | return 0; |
719 | } | |
720 | ||
bb72bd68 MH |
721 | static int hci_uart_set_flags(struct hci_uart *hu, unsigned long flags) |
722 | { | |
723 | unsigned long valid_flags = BIT(HCI_UART_RAW_DEVICE) | | |
724 | BIT(HCI_UART_RESET_ON_INIT) | | |
725 | BIT(HCI_UART_CREATE_AMP) | | |
6afd04ad | 726 | BIT(HCI_UART_INIT_PENDING) | |
fb2ce8d1 MH |
727 | BIT(HCI_UART_EXT_CONFIG) | |
728 | BIT(HCI_UART_VND_DETECT); | |
bb72bd68 | 729 | |
41533fe5 | 730 | if (flags & ~valid_flags) |
bb72bd68 MH |
731 | return -EINVAL; |
732 | ||
733 | hu->hdev_flags = flags; | |
734 | ||
735 | return 0; | |
736 | } | |
737 | ||
1da177e4 LT |
738 | /* hci_uart_tty_ioctl() |
739 | * | |
740 | * Process IOCTL system call for the tty device. | |
741 | * | |
742 | * Arguments: | |
743 | * | |
744 | * tty pointer to tty instance data | |
1da177e4 LT |
745 | * cmd IOCTL command code |
746 | * arg argument for IOCTL call (cmd dependent) | |
747 | * | |
748 | * Return Value: Command dependent | |
749 | */ | |
d78328bc JS |
750 | static int hci_uart_tty_ioctl(struct tty_struct *tty, unsigned int cmd, |
751 | unsigned long arg) | |
1da177e4 | 752 | { |
dfe19d28 | 753 | struct hci_uart *hu = tty->disc_data; |
1da177e4 LT |
754 | int err = 0; |
755 | ||
756 | BT_DBG(""); | |
757 | ||
758 | /* Verify the status of the device */ | |
759 | if (!hu) | |
760 | return -EBADF; | |
761 | ||
762 | switch (cmd) { | |
763 | case HCIUARTSETPROTO: | |
764 | if (!test_and_set_bit(HCI_UART_PROTO_SET, &hu->flags)) { | |
765 | err = hci_uart_set_proto(hu, arg); | |
05650694 | 766 | if (err) |
1da177e4 | 767 | clear_bit(HCI_UART_PROTO_SET, &hu->flags); |
0372a662 | 768 | } else |
05650694 | 769 | err = -EBUSY; |
c33be3c3 | 770 | break; |
1da177e4 LT |
771 | |
772 | case HCIUARTGETPROTO: | |
773 | if (test_bit(HCI_UART_PROTO_SET, &hu->flags)) | |
05650694 VR |
774 | err = hu->proto->id; |
775 | else | |
776 | err = -EUNATCH; | |
777 | break; | |
0372a662 | 778 | |
d2158744 | 779 | case HCIUARTGETDEVICE: |
c7e0c141 | 780 | if (test_bit(HCI_UART_REGISTERED, &hu->flags)) |
05650694 VR |
781 | err = hu->hdev->id; |
782 | else | |
783 | err = -EUNATCH; | |
784 | break; | |
d2158744 | 785 | |
63c7d09c JH |
786 | case HCIUARTSETFLAGS: |
787 | if (test_bit(HCI_UART_PROTO_SET, &hu->flags)) | |
05650694 VR |
788 | err = -EBUSY; |
789 | else | |
790 | err = hci_uart_set_flags(hu, arg); | |
63c7d09c JH |
791 | break; |
792 | ||
793 | case HCIUARTGETFLAGS: | |
05650694 VR |
794 | err = hu->hdev_flags; |
795 | break; | |
63c7d09c | 796 | |
1da177e4 | 797 | default: |
7c783601 | 798 | err = n_tty_ioctl_helper(tty, cmd, arg); |
1da177e4 | 799 | break; |
a20890d0 | 800 | } |
1da177e4 LT |
801 | |
802 | return err; | |
803 | } | |
804 | ||
805 | /* | |
806 | * We don't provide read/write/poll interface for user space. | |
807 | */ | |
0372a662 | 808 | static ssize_t hci_uart_tty_read(struct tty_struct *tty, struct file *file, |
3b830a9c LT |
809 | unsigned char *buf, size_t nr, |
810 | void **cookie, unsigned long offset) | |
1da177e4 LT |
811 | { |
812 | return 0; | |
813 | } | |
0372a662 MH |
814 | |
815 | static ssize_t hci_uart_tty_write(struct tty_struct *tty, struct file *file, | |
facf5225 | 816 | const unsigned char *data, size_t count) |
1da177e4 LT |
817 | { |
818 | return 0; | |
819 | } | |
0372a662 | 820 | |
afc9a42b | 821 | static __poll_t hci_uart_tty_poll(struct tty_struct *tty, |
facf5225 | 822 | struct file *filp, poll_table *wait) |
1da177e4 LT |
823 | { |
824 | return 0; | |
825 | } | |
826 | ||
3b830a9c LT |
827 | static struct tty_ldisc_ops hci_uart_ldisc = { |
828 | .owner = THIS_MODULE, | |
fbadf70a | 829 | .num = N_HCI, |
3b830a9c LT |
830 | .name = "n_hci", |
831 | .open = hci_uart_tty_open, | |
832 | .close = hci_uart_tty_close, | |
833 | .read = hci_uart_tty_read, | |
834 | .write = hci_uart_tty_write, | |
835 | .ioctl = hci_uart_tty_ioctl, | |
836 | .compat_ioctl = hci_uart_tty_ioctl, | |
837 | .poll = hci_uart_tty_poll, | |
838 | .receive_buf = hci_uart_tty_receive, | |
839 | .write_wakeup = hci_uart_tty_wakeup, | |
840 | }; | |
841 | ||
1da177e4 LT |
842 | static int __init hci_uart_init(void) |
843 | { | |
1da177e4 LT |
844 | int err; |
845 | ||
846 | BT_INFO("HCI UART driver ver %s", VERSION); | |
847 | ||
848 | /* Register the tty discipline */ | |
fbadf70a | 849 | err = tty_register_ldisc(&hci_uart_ldisc); |
a08b15e6 | 850 | if (err) { |
1da177e4 LT |
851 | BT_ERR("HCI line discipline registration failed. (%d)", err); |
852 | return err; | |
853 | } | |
854 | ||
855 | #ifdef CONFIG_BT_HCIUART_H4 | |
856 | h4_init(); | |
857 | #endif | |
858 | #ifdef CONFIG_BT_HCIUART_BCSP | |
859 | bcsp_init(); | |
860 | #endif | |
166d2f6a OBC |
861 | #ifdef CONFIG_BT_HCIUART_LL |
862 | ll_init(); | |
863 | #endif | |
b3190df6 SS |
864 | #ifdef CONFIG_BT_HCIUART_ATH3K |
865 | ath_init(); | |
866 | #endif | |
7dec65c8 JH |
867 | #ifdef CONFIG_BT_HCIUART_3WIRE |
868 | h5_init(); | |
869 | #endif | |
ca93cee5 LP |
870 | #ifdef CONFIG_BT_HCIUART_INTEL |
871 | intel_init(); | |
872 | #endif | |
bdd8818e MH |
873 | #ifdef CONFIG_BT_HCIUART_BCM |
874 | bcm_init(); | |
875 | #endif | |
0ff252c1 BYTK |
876 | #ifdef CONFIG_BT_HCIUART_QCA |
877 | qca_init(); | |
878 | #endif | |
395174bb LP |
879 | #ifdef CONFIG_BT_HCIUART_AG6XX |
880 | ag6xx_init(); | |
881 | #endif | |
162f812f LP |
882 | #ifdef CONFIG_BT_HCIUART_MRVL |
883 | mrvl_init(); | |
884 | #endif | |
166d2f6a | 885 | |
1da177e4 LT |
886 | return 0; |
887 | } | |
888 | ||
889 | static void __exit hci_uart_exit(void) | |
890 | { | |
1da177e4 LT |
891 | #ifdef CONFIG_BT_HCIUART_H4 |
892 | h4_deinit(); | |
893 | #endif | |
894 | #ifdef CONFIG_BT_HCIUART_BCSP | |
895 | bcsp_deinit(); | |
896 | #endif | |
166d2f6a OBC |
897 | #ifdef CONFIG_BT_HCIUART_LL |
898 | ll_deinit(); | |
899 | #endif | |
b3190df6 SS |
900 | #ifdef CONFIG_BT_HCIUART_ATH3K |
901 | ath_deinit(); | |
902 | #endif | |
7dec65c8 JH |
903 | #ifdef CONFIG_BT_HCIUART_3WIRE |
904 | h5_deinit(); | |
905 | #endif | |
ca93cee5 LP |
906 | #ifdef CONFIG_BT_HCIUART_INTEL |
907 | intel_deinit(); | |
908 | #endif | |
bdd8818e MH |
909 | #ifdef CONFIG_BT_HCIUART_BCM |
910 | bcm_deinit(); | |
911 | #endif | |
0ff252c1 BYTK |
912 | #ifdef CONFIG_BT_HCIUART_QCA |
913 | qca_deinit(); | |
914 | #endif | |
395174bb LP |
915 | #ifdef CONFIG_BT_HCIUART_AG6XX |
916 | ag6xx_deinit(); | |
917 | #endif | |
162f812f LP |
918 | #ifdef CONFIG_BT_HCIUART_MRVL |
919 | mrvl_deinit(); | |
920 | #endif | |
1da177e4 | 921 | |
357a6a87 | 922 | tty_unregister_ldisc(&hci_uart_ldisc); |
1da177e4 LT |
923 | } |
924 | ||
925 | module_init(hci_uart_init); | |
926 | module_exit(hci_uart_exit); | |
927 | ||
63fbd24e | 928 | MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); |
1da177e4 LT |
929 | MODULE_DESCRIPTION("Bluetooth HCI UART driver ver " VERSION); |
930 | MODULE_VERSION(VERSION); | |
931 | MODULE_LICENSE("GPL"); | |
932 | MODULE_ALIAS_LDISC(N_HCI); |