Ohad Ben-Cohen | 166d2f6 | 2007-10-20 13:42:36 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Texas Instruments' Bluetooth HCILL UART protocol |
| 3 | * |
| 4 | * HCILL (HCI Low Level) is a Texas Instruments' power management |
| 5 | * protocol extension to H4. |
| 6 | * |
| 7 | * Copyright (C) 2007 Texas Instruments, Inc. |
| 8 | * |
| 9 | * Written by Ohad Ben-Cohen <ohad@bencohen.org> |
| 10 | * |
| 11 | * Acknowledgements: |
| 12 | * This file is based on hci_h4.c, which was written |
| 13 | * by Maxim Krasnyansky and Marcel Holtmann. |
| 14 | * |
| 15 | * This program is free software; you can redistribute it and/or modify |
| 16 | * it under the terms of the GNU General Public License version 2 |
| 17 | * as published by the Free Software Foundation |
| 18 | * |
| 19 | * This program is distributed in the hope that it will be useful, |
| 20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 22 | * GNU General Public License for more details. |
| 23 | * |
| 24 | * You should have received a copy of the GNU General Public License |
| 25 | * along with this program; if not, write to the Free Software |
| 26 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 27 | * |
| 28 | */ |
| 29 | |
| 30 | #include <linux/module.h> |
| 31 | #include <linux/kernel.h> |
| 32 | |
| 33 | #include <linux/init.h> |
| 34 | #include <linux/sched.h> |
| 35 | #include <linux/types.h> |
| 36 | #include <linux/fcntl.h> |
| 37 | #include <linux/interrupt.h> |
| 38 | #include <linux/ptrace.h> |
| 39 | #include <linux/poll.h> |
| 40 | |
| 41 | #include <linux/slab.h> |
| 42 | #include <linux/tty.h> |
| 43 | #include <linux/errno.h> |
| 44 | #include <linux/string.h> |
| 45 | #include <linux/signal.h> |
| 46 | #include <linux/ioctl.h> |
| 47 | #include <linux/skbuff.h> |
| 48 | |
| 49 | #include <net/bluetooth/bluetooth.h> |
| 50 | #include <net/bluetooth/hci_core.h> |
| 51 | |
| 52 | #include "hci_uart.h" |
| 53 | |
| 54 | /* HCILL commands */ |
| 55 | #define HCILL_GO_TO_SLEEP_IND 0x30 |
| 56 | #define HCILL_GO_TO_SLEEP_ACK 0x31 |
| 57 | #define HCILL_WAKE_UP_IND 0x32 |
| 58 | #define HCILL_WAKE_UP_ACK 0x33 |
| 59 | |
| 60 | /* HCILL receiver States */ |
| 61 | #define HCILL_W4_PACKET_TYPE 0 |
| 62 | #define HCILL_W4_EVENT_HDR 1 |
| 63 | #define HCILL_W4_ACL_HDR 2 |
| 64 | #define HCILL_W4_SCO_HDR 3 |
| 65 | #define HCILL_W4_DATA 4 |
| 66 | |
| 67 | /* HCILL states */ |
| 68 | enum hcill_states_e { |
| 69 | HCILL_ASLEEP, |
| 70 | HCILL_ASLEEP_TO_AWAKE, |
| 71 | HCILL_AWAKE, |
| 72 | HCILL_AWAKE_TO_ASLEEP |
| 73 | }; |
| 74 | |
| 75 | struct hcill_cmd { |
| 76 | u8 cmd; |
Gustavo F. Padovan | 81ca405 | 2010-07-19 13:54:05 -0300 | [diff] [blame^] | 77 | } __packed; |
Ohad Ben-Cohen | 166d2f6 | 2007-10-20 13:42:36 +0200 | [diff] [blame] | 78 | |
| 79 | struct ll_struct { |
| 80 | unsigned long rx_state; |
| 81 | unsigned long rx_count; |
| 82 | struct sk_buff *rx_skb; |
| 83 | struct sk_buff_head txq; |
| 84 | spinlock_t hcill_lock; /* HCILL state lock */ |
| 85 | unsigned long hcill_state; /* HCILL power state */ |
| 86 | struct sk_buff_head tx_wait_q; /* HCILL wait queue */ |
| 87 | }; |
| 88 | |
| 89 | /* |
| 90 | * Builds and sends an HCILL command packet. |
| 91 | * These are very simple packets with only 1 cmd byte |
| 92 | */ |
| 93 | static int send_hcill_cmd(u8 cmd, struct hci_uart *hu) |
| 94 | { |
| 95 | int err = 0; |
| 96 | struct sk_buff *skb = NULL; |
| 97 | struct ll_struct *ll = hu->priv; |
| 98 | struct hcill_cmd *hcill_packet; |
| 99 | |
| 100 | BT_DBG("hu %p cmd 0x%x", hu, cmd); |
| 101 | |
| 102 | /* allocate packet */ |
| 103 | skb = bt_skb_alloc(1, GFP_ATOMIC); |
| 104 | if (!skb) { |
| 105 | BT_ERR("cannot allocate memory for HCILL packet"); |
| 106 | err = -ENOMEM; |
| 107 | goto out; |
| 108 | } |
| 109 | |
| 110 | /* prepare packet */ |
| 111 | hcill_packet = (struct hcill_cmd *) skb_put(skb, 1); |
| 112 | hcill_packet->cmd = cmd; |
| 113 | skb->dev = (void *) hu->hdev; |
| 114 | |
| 115 | /* send packet */ |
| 116 | skb_queue_tail(&ll->txq, skb); |
| 117 | out: |
| 118 | return err; |
| 119 | } |
| 120 | |
| 121 | /* Initialize protocol */ |
| 122 | static int ll_open(struct hci_uart *hu) |
| 123 | { |
| 124 | struct ll_struct *ll; |
| 125 | |
| 126 | BT_DBG("hu %p", hu); |
| 127 | |
| 128 | ll = kzalloc(sizeof(*ll), GFP_ATOMIC); |
| 129 | if (!ll) |
| 130 | return -ENOMEM; |
| 131 | |
| 132 | skb_queue_head_init(&ll->txq); |
| 133 | skb_queue_head_init(&ll->tx_wait_q); |
| 134 | spin_lock_init(&ll->hcill_lock); |
| 135 | |
| 136 | ll->hcill_state = HCILL_AWAKE; |
| 137 | |
| 138 | hu->priv = ll; |
| 139 | |
| 140 | return 0; |
| 141 | } |
| 142 | |
| 143 | /* Flush protocol data */ |
| 144 | static int ll_flush(struct hci_uart *hu) |
| 145 | { |
| 146 | struct ll_struct *ll = hu->priv; |
| 147 | |
| 148 | BT_DBG("hu %p", hu); |
| 149 | |
| 150 | skb_queue_purge(&ll->tx_wait_q); |
| 151 | skb_queue_purge(&ll->txq); |
| 152 | |
| 153 | return 0; |
| 154 | } |
| 155 | |
| 156 | /* Close protocol */ |
| 157 | static int ll_close(struct hci_uart *hu) |
| 158 | { |
| 159 | struct ll_struct *ll = hu->priv; |
| 160 | |
| 161 | BT_DBG("hu %p", hu); |
| 162 | |
| 163 | skb_queue_purge(&ll->tx_wait_q); |
| 164 | skb_queue_purge(&ll->txq); |
| 165 | |
Wei Yongjun | b1fb068 | 2009-02-25 18:09:33 +0800 | [diff] [blame] | 166 | kfree_skb(ll->rx_skb); |
Ohad Ben-Cohen | 166d2f6 | 2007-10-20 13:42:36 +0200 | [diff] [blame] | 167 | |
| 168 | hu->priv = NULL; |
| 169 | |
| 170 | kfree(ll); |
| 171 | |
| 172 | return 0; |
| 173 | } |
| 174 | |
| 175 | /* |
| 176 | * internal function, which does common work of the device wake up process: |
| 177 | * 1. places all pending packets (waiting in tx_wait_q list) in txq list. |
| 178 | * 2. changes internal state to HCILL_AWAKE. |
| 179 | * Note: assumes that hcill_lock spinlock is taken, |
| 180 | * shouldn't be called otherwise! |
| 181 | */ |
| 182 | static void __ll_do_awake(struct ll_struct *ll) |
| 183 | { |
| 184 | struct sk_buff *skb = NULL; |
| 185 | |
| 186 | while ((skb = skb_dequeue(&ll->tx_wait_q))) |
| 187 | skb_queue_tail(&ll->txq, skb); |
| 188 | |
| 189 | ll->hcill_state = HCILL_AWAKE; |
| 190 | } |
| 191 | |
| 192 | /* |
| 193 | * Called upon a wake-up-indication from the device |
| 194 | */ |
| 195 | static void ll_device_want_to_wakeup(struct hci_uart *hu) |
| 196 | { |
| 197 | unsigned long flags; |
| 198 | struct ll_struct *ll = hu->priv; |
| 199 | |
| 200 | BT_DBG("hu %p", hu); |
| 201 | |
| 202 | /* lock hcill state */ |
| 203 | spin_lock_irqsave(&ll->hcill_lock, flags); |
| 204 | |
| 205 | switch (ll->hcill_state) { |
Ohad Ben-Cohen | 5c54822 | 2008-01-10 22:24:43 -0800 | [diff] [blame] | 206 | case HCILL_ASLEEP_TO_AWAKE: |
| 207 | /* |
| 208 | * This state means that both the host and the BRF chip |
| 209 | * have simultaneously sent a wake-up-indication packet. |
| 210 | * Traditionaly, in this case, receiving a wake-up-indication |
| 211 | * was enough and an additional wake-up-ack wasn't needed. |
| 212 | * This has changed with the BRF6350, which does require an |
| 213 | * explicit wake-up-ack. Other BRF versions, which do not |
| 214 | * require an explicit ack here, do accept it, thus it is |
| 215 | * perfectly safe to always send one. |
| 216 | */ |
| 217 | BT_DBG("dual wake-up-indication"); |
| 218 | /* deliberate fall-through - do not add break */ |
Ohad Ben-Cohen | 166d2f6 | 2007-10-20 13:42:36 +0200 | [diff] [blame] | 219 | case HCILL_ASLEEP: |
| 220 | /* acknowledge device wake up */ |
| 221 | if (send_hcill_cmd(HCILL_WAKE_UP_ACK, hu) < 0) { |
| 222 | BT_ERR("cannot acknowledge device wake up"); |
| 223 | goto out; |
| 224 | } |
| 225 | break; |
Ohad Ben-Cohen | 166d2f6 | 2007-10-20 13:42:36 +0200 | [diff] [blame] | 226 | default: |
Ohad Ben-Cohen | 5c54822 | 2008-01-10 22:24:43 -0800 | [diff] [blame] | 227 | /* any other state is illegal */ |
Ohad Ben-Cohen | 166d2f6 | 2007-10-20 13:42:36 +0200 | [diff] [blame] | 228 | BT_ERR("received HCILL_WAKE_UP_IND in state %ld", ll->hcill_state); |
| 229 | break; |
| 230 | } |
| 231 | |
| 232 | /* send pending packets and change state to HCILL_AWAKE */ |
| 233 | __ll_do_awake(ll); |
| 234 | |
| 235 | out: |
| 236 | spin_unlock_irqrestore(&ll->hcill_lock, flags); |
| 237 | |
| 238 | /* actually send the packets */ |
| 239 | hci_uart_tx_wakeup(hu); |
| 240 | } |
| 241 | |
| 242 | /* |
| 243 | * Called upon a sleep-indication from the device |
| 244 | */ |
| 245 | static void ll_device_want_to_sleep(struct hci_uart *hu) |
| 246 | { |
| 247 | unsigned long flags; |
| 248 | struct ll_struct *ll = hu->priv; |
| 249 | |
| 250 | BT_DBG("hu %p", hu); |
| 251 | |
| 252 | /* lock hcill state */ |
| 253 | spin_lock_irqsave(&ll->hcill_lock, flags); |
| 254 | |
| 255 | /* sanity check */ |
| 256 | if (ll->hcill_state != HCILL_AWAKE) |
| 257 | BT_ERR("ERR: HCILL_GO_TO_SLEEP_IND in state %ld", ll->hcill_state); |
| 258 | |
| 259 | /* acknowledge device sleep */ |
| 260 | if (send_hcill_cmd(HCILL_GO_TO_SLEEP_ACK, hu) < 0) { |
| 261 | BT_ERR("cannot acknowledge device sleep"); |
| 262 | goto out; |
| 263 | } |
| 264 | |
| 265 | /* update state */ |
| 266 | ll->hcill_state = HCILL_ASLEEP; |
| 267 | |
| 268 | out: |
| 269 | spin_unlock_irqrestore(&ll->hcill_lock, flags); |
| 270 | |
| 271 | /* actually send the sleep ack packet */ |
| 272 | hci_uart_tx_wakeup(hu); |
| 273 | } |
| 274 | |
| 275 | /* |
| 276 | * Called upon wake-up-acknowledgement from the device |
| 277 | */ |
| 278 | static void ll_device_woke_up(struct hci_uart *hu) |
| 279 | { |
| 280 | unsigned long flags; |
| 281 | struct ll_struct *ll = hu->priv; |
| 282 | |
| 283 | BT_DBG("hu %p", hu); |
| 284 | |
| 285 | /* lock hcill state */ |
| 286 | spin_lock_irqsave(&ll->hcill_lock, flags); |
| 287 | |
| 288 | /* sanity check */ |
| 289 | if (ll->hcill_state != HCILL_ASLEEP_TO_AWAKE) |
| 290 | BT_ERR("received HCILL_WAKE_UP_ACK in state %ld", ll->hcill_state); |
| 291 | |
| 292 | /* send pending packets and change state to HCILL_AWAKE */ |
| 293 | __ll_do_awake(ll); |
| 294 | |
| 295 | spin_unlock_irqrestore(&ll->hcill_lock, flags); |
| 296 | |
| 297 | /* actually send the packets */ |
| 298 | hci_uart_tx_wakeup(hu); |
| 299 | } |
| 300 | |
| 301 | /* Enqueue frame for transmittion (padding, crc, etc) */ |
| 302 | /* may be called from two simultaneous tasklets */ |
| 303 | static int ll_enqueue(struct hci_uart *hu, struct sk_buff *skb) |
| 304 | { |
| 305 | unsigned long flags = 0; |
| 306 | struct ll_struct *ll = hu->priv; |
| 307 | |
| 308 | BT_DBG("hu %p skb %p", hu, skb); |
| 309 | |
| 310 | /* Prepend skb with frame type */ |
| 311 | memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1); |
| 312 | |
| 313 | /* lock hcill state */ |
| 314 | spin_lock_irqsave(&ll->hcill_lock, flags); |
| 315 | |
| 316 | /* act according to current state */ |
| 317 | switch (ll->hcill_state) { |
| 318 | case HCILL_AWAKE: |
| 319 | BT_DBG("device awake, sending normally"); |
| 320 | skb_queue_tail(&ll->txq, skb); |
| 321 | break; |
| 322 | case HCILL_ASLEEP: |
| 323 | BT_DBG("device asleep, waking up and queueing packet"); |
| 324 | /* save packet for later */ |
| 325 | skb_queue_tail(&ll->tx_wait_q, skb); |
| 326 | /* awake device */ |
| 327 | if (send_hcill_cmd(HCILL_WAKE_UP_IND, hu) < 0) { |
| 328 | BT_ERR("cannot wake up device"); |
| 329 | break; |
| 330 | } |
| 331 | ll->hcill_state = HCILL_ASLEEP_TO_AWAKE; |
| 332 | break; |
| 333 | case HCILL_ASLEEP_TO_AWAKE: |
| 334 | BT_DBG("device waking up, queueing packet"); |
| 335 | /* transient state; just keep packet for later */ |
| 336 | skb_queue_tail(&ll->tx_wait_q, skb); |
| 337 | break; |
| 338 | default: |
| 339 | BT_ERR("illegal hcill state: %ld (losing packet)", ll->hcill_state); |
| 340 | kfree_skb(skb); |
| 341 | break; |
| 342 | } |
| 343 | |
| 344 | spin_unlock_irqrestore(&ll->hcill_lock, flags); |
| 345 | |
| 346 | return 0; |
| 347 | } |
| 348 | |
| 349 | static inline int ll_check_data_len(struct ll_struct *ll, int len) |
| 350 | { |
| 351 | register int room = skb_tailroom(ll->rx_skb); |
| 352 | |
| 353 | BT_DBG("len %d room %d", len, room); |
| 354 | |
| 355 | if (!len) { |
| 356 | hci_recv_frame(ll->rx_skb); |
| 357 | } else if (len > room) { |
| 358 | BT_ERR("Data length is too large"); |
| 359 | kfree_skb(ll->rx_skb); |
| 360 | } else { |
| 361 | ll->rx_state = HCILL_W4_DATA; |
| 362 | ll->rx_count = len; |
| 363 | return len; |
| 364 | } |
| 365 | |
| 366 | ll->rx_state = HCILL_W4_PACKET_TYPE; |
| 367 | ll->rx_skb = NULL; |
| 368 | ll->rx_count = 0; |
| 369 | |
| 370 | return 0; |
| 371 | } |
| 372 | |
| 373 | /* Recv data */ |
| 374 | static int ll_recv(struct hci_uart *hu, void *data, int count) |
| 375 | { |
| 376 | struct ll_struct *ll = hu->priv; |
| 377 | register char *ptr; |
| 378 | struct hci_event_hdr *eh; |
| 379 | struct hci_acl_hdr *ah; |
| 380 | struct hci_sco_hdr *sh; |
| 381 | register int len, type, dlen; |
| 382 | |
| 383 | BT_DBG("hu %p count %d rx_state %ld rx_count %ld", hu, count, ll->rx_state, ll->rx_count); |
| 384 | |
| 385 | ptr = data; |
| 386 | while (count) { |
| 387 | if (ll->rx_count) { |
| 388 | len = min_t(unsigned int, ll->rx_count, count); |
| 389 | memcpy(skb_put(ll->rx_skb, len), ptr, len); |
| 390 | ll->rx_count -= len; count -= len; ptr += len; |
| 391 | |
| 392 | if (ll->rx_count) |
| 393 | continue; |
| 394 | |
| 395 | switch (ll->rx_state) { |
| 396 | case HCILL_W4_DATA: |
| 397 | BT_DBG("Complete data"); |
| 398 | hci_recv_frame(ll->rx_skb); |
| 399 | |
| 400 | ll->rx_state = HCILL_W4_PACKET_TYPE; |
| 401 | ll->rx_skb = NULL; |
| 402 | continue; |
| 403 | |
| 404 | case HCILL_W4_EVENT_HDR: |
Gustavo F. Padovan | acce90d | 2010-05-01 16:15:34 -0300 | [diff] [blame] | 405 | eh = hci_event_hdr(ll->rx_skb); |
Ohad Ben-Cohen | 166d2f6 | 2007-10-20 13:42:36 +0200 | [diff] [blame] | 406 | |
| 407 | BT_DBG("Event header: evt 0x%2.2x plen %d", eh->evt, eh->plen); |
| 408 | |
| 409 | ll_check_data_len(ll, eh->plen); |
| 410 | continue; |
| 411 | |
| 412 | case HCILL_W4_ACL_HDR: |
Gustavo F. Padovan | acce90d | 2010-05-01 16:15:34 -0300 | [diff] [blame] | 413 | ah = hci_acl_hdr(ll->rx_skb); |
Ohad Ben-Cohen | 166d2f6 | 2007-10-20 13:42:36 +0200 | [diff] [blame] | 414 | dlen = __le16_to_cpu(ah->dlen); |
| 415 | |
| 416 | BT_DBG("ACL header: dlen %d", dlen); |
| 417 | |
| 418 | ll_check_data_len(ll, dlen); |
| 419 | continue; |
| 420 | |
| 421 | case HCILL_W4_SCO_HDR: |
Gustavo F. Padovan | acce90d | 2010-05-01 16:15:34 -0300 | [diff] [blame] | 422 | sh = hci_sco_hdr(ll->rx_skb); |
Ohad Ben-Cohen | 166d2f6 | 2007-10-20 13:42:36 +0200 | [diff] [blame] | 423 | |
| 424 | BT_DBG("SCO header: dlen %d", sh->dlen); |
| 425 | |
| 426 | ll_check_data_len(ll, sh->dlen); |
| 427 | continue; |
| 428 | } |
| 429 | } |
| 430 | |
| 431 | /* HCILL_W4_PACKET_TYPE */ |
| 432 | switch (*ptr) { |
| 433 | case HCI_EVENT_PKT: |
| 434 | BT_DBG("Event packet"); |
| 435 | ll->rx_state = HCILL_W4_EVENT_HDR; |
| 436 | ll->rx_count = HCI_EVENT_HDR_SIZE; |
| 437 | type = HCI_EVENT_PKT; |
| 438 | break; |
| 439 | |
| 440 | case HCI_ACLDATA_PKT: |
| 441 | BT_DBG("ACL packet"); |
| 442 | ll->rx_state = HCILL_W4_ACL_HDR; |
| 443 | ll->rx_count = HCI_ACL_HDR_SIZE; |
| 444 | type = HCI_ACLDATA_PKT; |
| 445 | break; |
| 446 | |
| 447 | case HCI_SCODATA_PKT: |
| 448 | BT_DBG("SCO packet"); |
| 449 | ll->rx_state = HCILL_W4_SCO_HDR; |
| 450 | ll->rx_count = HCI_SCO_HDR_SIZE; |
| 451 | type = HCI_SCODATA_PKT; |
| 452 | break; |
| 453 | |
| 454 | /* HCILL signals */ |
| 455 | case HCILL_GO_TO_SLEEP_IND: |
| 456 | BT_DBG("HCILL_GO_TO_SLEEP_IND packet"); |
| 457 | ll_device_want_to_sleep(hu); |
| 458 | ptr++; count--; |
| 459 | continue; |
| 460 | |
| 461 | case HCILL_GO_TO_SLEEP_ACK: |
| 462 | /* shouldn't happen */ |
| 463 | BT_ERR("received HCILL_GO_TO_SLEEP_ACK (in state %ld)", ll->hcill_state); |
| 464 | ptr++; count--; |
| 465 | continue; |
| 466 | |
| 467 | case HCILL_WAKE_UP_IND: |
| 468 | BT_DBG("HCILL_WAKE_UP_IND packet"); |
| 469 | ll_device_want_to_wakeup(hu); |
| 470 | ptr++; count--; |
| 471 | continue; |
| 472 | |
| 473 | case HCILL_WAKE_UP_ACK: |
| 474 | BT_DBG("HCILL_WAKE_UP_ACK packet"); |
| 475 | ll_device_woke_up(hu); |
| 476 | ptr++; count--; |
| 477 | continue; |
| 478 | |
| 479 | default: |
| 480 | BT_ERR("Unknown HCI packet type %2.2x", (__u8)*ptr); |
| 481 | hu->hdev->stat.err_rx++; |
| 482 | ptr++; count--; |
| 483 | continue; |
| 484 | }; |
| 485 | |
| 486 | ptr++; count--; |
| 487 | |
| 488 | /* Allocate packet */ |
| 489 | ll->rx_skb = bt_skb_alloc(HCI_MAX_FRAME_SIZE, GFP_ATOMIC); |
| 490 | if (!ll->rx_skb) { |
| 491 | BT_ERR("Can't allocate mem for new packet"); |
| 492 | ll->rx_state = HCILL_W4_PACKET_TYPE; |
| 493 | ll->rx_count = 0; |
Gustavo F. Padovan | fe1aff7 | 2010-05-01 16:15:34 -0300 | [diff] [blame] | 494 | return -ENOMEM; |
Ohad Ben-Cohen | 166d2f6 | 2007-10-20 13:42:36 +0200 | [diff] [blame] | 495 | } |
| 496 | |
| 497 | ll->rx_skb->dev = (void *) hu->hdev; |
| 498 | bt_cb(ll->rx_skb)->pkt_type = type; |
| 499 | } |
| 500 | |
| 501 | return count; |
| 502 | } |
| 503 | |
| 504 | static struct sk_buff *ll_dequeue(struct hci_uart *hu) |
| 505 | { |
| 506 | struct ll_struct *ll = hu->priv; |
| 507 | return skb_dequeue(&ll->txq); |
| 508 | } |
| 509 | |
| 510 | static struct hci_uart_proto llp = { |
| 511 | .id = HCI_UART_LL, |
| 512 | .open = ll_open, |
| 513 | .close = ll_close, |
| 514 | .recv = ll_recv, |
| 515 | .enqueue = ll_enqueue, |
| 516 | .dequeue = ll_dequeue, |
| 517 | .flush = ll_flush, |
| 518 | }; |
| 519 | |
| 520 | int ll_init(void) |
| 521 | { |
| 522 | int err = hci_uart_register_proto(&llp); |
| 523 | |
| 524 | if (!err) |
| 525 | BT_INFO("HCILL protocol initialized"); |
| 526 | else |
| 527 | BT_ERR("HCILL protocol registration failed"); |
| 528 | |
| 529 | return err; |
| 530 | } |
| 531 | |
| 532 | int ll_deinit(void) |
| 533 | { |
| 534 | return hci_uart_unregister_proto(&llp); |
| 535 | } |