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/firmware.h> 38 #include <linux/interrupt.h> 39 #include <linux/ptrace.h> 40 #include <linux/poll.h> 41 42 #include <linux/slab.h> 43 #include <linux/errno.h> 44 #include <linux/string.h> 45 #include <linux/signal.h> 46 #include <linux/ioctl.h> 47 #include <linux/of.h> 48 #include <linux/serdev.h> 49 #include <linux/skbuff.h> 50 #include <linux/ti_wilink_st.h> 51 #include <linux/clk.h> 52 53 #include <net/bluetooth/bluetooth.h> 54 #include <net/bluetooth/hci_core.h> 55 #include <linux/gpio/consumer.h> 56 #include <linux/nvmem-consumer.h> 57 58 #include "hci_uart.h" 59 60 /* Vendor-specific HCI commands */ 61 #define HCI_VS_WRITE_BD_ADDR 0xfc06 62 #define HCI_VS_UPDATE_UART_HCI_BAUDRATE 0xff36 63 64 /* HCILL commands */ 65 #define HCILL_GO_TO_SLEEP_IND 0x30 66 #define HCILL_GO_TO_SLEEP_ACK 0x31 67 #define HCILL_WAKE_UP_IND 0x32 68 #define HCILL_WAKE_UP_ACK 0x33 69 70 /* HCILL states */ 71 enum hcill_states_e { 72 HCILL_ASLEEP, 73 HCILL_ASLEEP_TO_AWAKE, 74 HCILL_AWAKE, 75 HCILL_AWAKE_TO_ASLEEP 76 }; 77 78 struct ll_device { 79 struct hci_uart hu; 80 struct serdev_device *serdev; 81 struct gpio_desc *enable_gpio; 82 struct clk *ext_clk; 83 bdaddr_t bdaddr; 84 }; 85 86 struct ll_struct { 87 struct sk_buff *rx_skb; 88 struct sk_buff_head txq; 89 spinlock_t hcill_lock; /* HCILL state lock */ 90 unsigned long hcill_state; /* HCILL power state */ 91 struct sk_buff_head tx_wait_q; /* HCILL wait queue */ 92 }; 93 94 /* 95 * Builds and sends an HCILL command packet. 96 * These are very simple packets with only 1 cmd byte 97 */ 98 static int send_hcill_cmd(u8 cmd, struct hci_uart *hu) 99 { 100 int err = 0; 101 struct sk_buff *skb = NULL; 102 struct ll_struct *ll = hu->priv; 103 104 BT_DBG("hu %p cmd 0x%x", hu, cmd); 105 106 /* allocate packet */ 107 skb = bt_skb_alloc(1, GFP_ATOMIC); 108 if (!skb) { 109 BT_ERR("cannot allocate memory for HCILL packet"); 110 err = -ENOMEM; 111 goto out; 112 } 113 114 /* prepare packet */ 115 skb_put_u8(skb, cmd); 116 117 /* send packet */ 118 skb_queue_tail(&ll->txq, skb); 119 out: 120 return err; 121 } 122 123 /* Initialize protocol */ 124 static int ll_open(struct hci_uart *hu) 125 { 126 struct ll_struct *ll; 127 128 BT_DBG("hu %p", hu); 129 130 ll = kzalloc(sizeof(*ll), GFP_KERNEL); 131 if (!ll) 132 return -ENOMEM; 133 134 skb_queue_head_init(&ll->txq); 135 skb_queue_head_init(&ll->tx_wait_q); 136 spin_lock_init(&ll->hcill_lock); 137 138 ll->hcill_state = HCILL_AWAKE; 139 140 hu->priv = ll; 141 142 if (hu->serdev) { 143 struct ll_device *lldev = serdev_device_get_drvdata(hu->serdev); 144 if (!IS_ERR(lldev->ext_clk)) 145 clk_prepare_enable(lldev->ext_clk); 146 } 147 148 return 0; 149 } 150 151 /* Flush protocol data */ 152 static int ll_flush(struct hci_uart *hu) 153 { 154 struct ll_struct *ll = hu->priv; 155 156 BT_DBG("hu %p", hu); 157 158 skb_queue_purge(&ll->tx_wait_q); 159 skb_queue_purge(&ll->txq); 160 161 return 0; 162 } 163 164 /* Close protocol */ 165 static int ll_close(struct hci_uart *hu) 166 { 167 struct ll_struct *ll = hu->priv; 168 169 BT_DBG("hu %p", hu); 170 171 skb_queue_purge(&ll->tx_wait_q); 172 skb_queue_purge(&ll->txq); 173 174 kfree_skb(ll->rx_skb); 175 176 if (hu->serdev) { 177 struct ll_device *lldev = serdev_device_get_drvdata(hu->serdev); 178 gpiod_set_value_cansleep(lldev->enable_gpio, 0); 179 180 clk_disable_unprepare(lldev->ext_clk); 181 } 182 183 hu->priv = NULL; 184 185 kfree(ll); 186 187 return 0; 188 } 189 190 /* 191 * internal function, which does common work of the device wake up process: 192 * 1. places all pending packets (waiting in tx_wait_q list) in txq list. 193 * 2. changes internal state to HCILL_AWAKE. 194 * Note: assumes that hcill_lock spinlock is taken, 195 * shouldn't be called otherwise! 196 */ 197 static void __ll_do_awake(struct ll_struct *ll) 198 { 199 struct sk_buff *skb = NULL; 200 201 while ((skb = skb_dequeue(&ll->tx_wait_q))) 202 skb_queue_tail(&ll->txq, skb); 203 204 ll->hcill_state = HCILL_AWAKE; 205 } 206 207 /* 208 * Called upon a wake-up-indication from the device 209 */ 210 static void ll_device_want_to_wakeup(struct hci_uart *hu) 211 { 212 unsigned long flags; 213 struct ll_struct *ll = hu->priv; 214 215 BT_DBG("hu %p", hu); 216 217 /* lock hcill state */ 218 spin_lock_irqsave(&ll->hcill_lock, flags); 219 220 switch (ll->hcill_state) { 221 case HCILL_ASLEEP_TO_AWAKE: 222 /* 223 * This state means that both the host and the BRF chip 224 * have simultaneously sent a wake-up-indication packet. 225 * Traditionally, in this case, receiving a wake-up-indication 226 * was enough and an additional wake-up-ack wasn't needed. 227 * This has changed with the BRF6350, which does require an 228 * explicit wake-up-ack. Other BRF versions, which do not 229 * require an explicit ack here, do accept it, thus it is 230 * perfectly safe to always send one. 231 */ 232 BT_DBG("dual wake-up-indication"); 233 /* fall through */ 234 case HCILL_ASLEEP: 235 /* acknowledge device wake up */ 236 if (send_hcill_cmd(HCILL_WAKE_UP_ACK, hu) < 0) { 237 BT_ERR("cannot acknowledge device wake up"); 238 goto out; 239 } 240 break; 241 default: 242 /* any other state is illegal */ 243 BT_ERR("received HCILL_WAKE_UP_IND in state %ld", ll->hcill_state); 244 break; 245 } 246 247 /* send pending packets and change state to HCILL_AWAKE */ 248 __ll_do_awake(ll); 249 250 out: 251 spin_unlock_irqrestore(&ll->hcill_lock, flags); 252 253 /* actually send the packets */ 254 hci_uart_tx_wakeup(hu); 255 } 256 257 /* 258 * Called upon a sleep-indication from the device 259 */ 260 static void ll_device_want_to_sleep(struct hci_uart *hu) 261 { 262 unsigned long flags; 263 struct ll_struct *ll = hu->priv; 264 265 BT_DBG("hu %p", hu); 266 267 /* lock hcill state */ 268 spin_lock_irqsave(&ll->hcill_lock, flags); 269 270 /* sanity check */ 271 if (ll->hcill_state != HCILL_AWAKE) 272 BT_ERR("ERR: HCILL_GO_TO_SLEEP_IND in state %ld", ll->hcill_state); 273 274 /* acknowledge device sleep */ 275 if (send_hcill_cmd(HCILL_GO_TO_SLEEP_ACK, hu) < 0) { 276 BT_ERR("cannot acknowledge device sleep"); 277 goto out; 278 } 279 280 /* update state */ 281 ll->hcill_state = HCILL_ASLEEP; 282 283 out: 284 spin_unlock_irqrestore(&ll->hcill_lock, flags); 285 286 /* actually send the sleep ack packet */ 287 hci_uart_tx_wakeup(hu); 288 } 289 290 /* 291 * Called upon wake-up-acknowledgement from the device 292 */ 293 static void ll_device_woke_up(struct hci_uart *hu) 294 { 295 unsigned long flags; 296 struct ll_struct *ll = hu->priv; 297 298 BT_DBG("hu %p", hu); 299 300 /* lock hcill state */ 301 spin_lock_irqsave(&ll->hcill_lock, flags); 302 303 /* sanity check */ 304 if (ll->hcill_state != HCILL_ASLEEP_TO_AWAKE) 305 BT_ERR("received HCILL_WAKE_UP_ACK in state %ld", ll->hcill_state); 306 307 /* send pending packets and change state to HCILL_AWAKE */ 308 __ll_do_awake(ll); 309 310 spin_unlock_irqrestore(&ll->hcill_lock, flags); 311 312 /* actually send the packets */ 313 hci_uart_tx_wakeup(hu); 314 } 315 316 /* Enqueue frame for transmittion (padding, crc, etc) */ 317 /* may be called from two simultaneous tasklets */ 318 static int ll_enqueue(struct hci_uart *hu, struct sk_buff *skb) 319 { 320 unsigned long flags = 0; 321 struct ll_struct *ll = hu->priv; 322 323 BT_DBG("hu %p skb %p", hu, skb); 324 325 /* Prepend skb with frame type */ 326 memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1); 327 328 /* lock hcill state */ 329 spin_lock_irqsave(&ll->hcill_lock, flags); 330 331 /* act according to current state */ 332 switch (ll->hcill_state) { 333 case HCILL_AWAKE: 334 BT_DBG("device awake, sending normally"); 335 skb_queue_tail(&ll->txq, skb); 336 break; 337 case HCILL_ASLEEP: 338 BT_DBG("device asleep, waking up and queueing packet"); 339 /* save packet for later */ 340 skb_queue_tail(&ll->tx_wait_q, skb); 341 /* awake device */ 342 if (send_hcill_cmd(HCILL_WAKE_UP_IND, hu) < 0) { 343 BT_ERR("cannot wake up device"); 344 break; 345 } 346 ll->hcill_state = HCILL_ASLEEP_TO_AWAKE; 347 break; 348 case HCILL_ASLEEP_TO_AWAKE: 349 BT_DBG("device waking up, queueing packet"); 350 /* transient state; just keep packet for later */ 351 skb_queue_tail(&ll->tx_wait_q, skb); 352 break; 353 default: 354 BT_ERR("illegal hcill state: %ld (losing packet)", ll->hcill_state); 355 kfree_skb(skb); 356 break; 357 } 358 359 spin_unlock_irqrestore(&ll->hcill_lock, flags); 360 361 return 0; 362 } 363 364 static int ll_recv_frame(struct hci_dev *hdev, struct sk_buff *skb) 365 { 366 struct hci_uart *hu = hci_get_drvdata(hdev); 367 struct ll_struct *ll = hu->priv; 368 369 switch (hci_skb_pkt_type(skb)) { 370 case HCILL_GO_TO_SLEEP_IND: 371 BT_DBG("HCILL_GO_TO_SLEEP_IND packet"); 372 ll_device_want_to_sleep(hu); 373 break; 374 case HCILL_GO_TO_SLEEP_ACK: 375 /* shouldn't happen */ 376 bt_dev_err(hdev, "received HCILL_GO_TO_SLEEP_ACK in state %ld", 377 ll->hcill_state); 378 break; 379 case HCILL_WAKE_UP_IND: 380 BT_DBG("HCILL_WAKE_UP_IND packet"); 381 ll_device_want_to_wakeup(hu); 382 break; 383 case HCILL_WAKE_UP_ACK: 384 BT_DBG("HCILL_WAKE_UP_ACK packet"); 385 ll_device_woke_up(hu); 386 break; 387 } 388 389 kfree_skb(skb); 390 return 0; 391 } 392 393 #define LL_RECV_SLEEP_IND \ 394 .type = HCILL_GO_TO_SLEEP_IND, \ 395 .hlen = 0, \ 396 .loff = 0, \ 397 .lsize = 0, \ 398 .maxlen = 0 399 400 #define LL_RECV_SLEEP_ACK \ 401 .type = HCILL_GO_TO_SLEEP_ACK, \ 402 .hlen = 0, \ 403 .loff = 0, \ 404 .lsize = 0, \ 405 .maxlen = 0 406 407 #define LL_RECV_WAKE_IND \ 408 .type = HCILL_WAKE_UP_IND, \ 409 .hlen = 0, \ 410 .loff = 0, \ 411 .lsize = 0, \ 412 .maxlen = 0 413 414 #define LL_RECV_WAKE_ACK \ 415 .type = HCILL_WAKE_UP_ACK, \ 416 .hlen = 0, \ 417 .loff = 0, \ 418 .lsize = 0, \ 419 .maxlen = 0 420 421 static const struct h4_recv_pkt ll_recv_pkts[] = { 422 { H4_RECV_ACL, .recv = hci_recv_frame }, 423 { H4_RECV_SCO, .recv = hci_recv_frame }, 424 { H4_RECV_EVENT, .recv = hci_recv_frame }, 425 { LL_RECV_SLEEP_IND, .recv = ll_recv_frame }, 426 { LL_RECV_SLEEP_ACK, .recv = ll_recv_frame }, 427 { LL_RECV_WAKE_IND, .recv = ll_recv_frame }, 428 { LL_RECV_WAKE_ACK, .recv = ll_recv_frame }, 429 }; 430 431 /* Recv data */ 432 static int ll_recv(struct hci_uart *hu, const void *data, int count) 433 { 434 struct ll_struct *ll = hu->priv; 435 436 if (!test_bit(HCI_UART_REGISTERED, &hu->flags)) 437 return -EUNATCH; 438 439 ll->rx_skb = h4_recv_buf(hu->hdev, ll->rx_skb, data, count, 440 ll_recv_pkts, ARRAY_SIZE(ll_recv_pkts)); 441 if (IS_ERR(ll->rx_skb)) { 442 int err = PTR_ERR(ll->rx_skb); 443 bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err); 444 ll->rx_skb = NULL; 445 return err; 446 } 447 448 return count; 449 } 450 451 static struct sk_buff *ll_dequeue(struct hci_uart *hu) 452 { 453 struct ll_struct *ll = hu->priv; 454 return skb_dequeue(&ll->txq); 455 } 456 457 #if IS_ENABLED(CONFIG_SERIAL_DEV_BUS) 458 static int read_local_version(struct hci_dev *hdev) 459 { 460 int err = 0; 461 unsigned short version = 0; 462 struct sk_buff *skb; 463 struct hci_rp_read_local_version *ver; 464 465 skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_VERSION, 0, NULL, HCI_INIT_TIMEOUT); 466 if (IS_ERR(skb)) { 467 bt_dev_err(hdev, "Reading TI version information failed (%ld)", 468 PTR_ERR(skb)); 469 return PTR_ERR(skb); 470 } 471 if (skb->len != sizeof(*ver)) { 472 err = -EILSEQ; 473 goto out; 474 } 475 476 ver = (struct hci_rp_read_local_version *)skb->data; 477 if (le16_to_cpu(ver->manufacturer) != 13) { 478 err = -ENODEV; 479 goto out; 480 } 481 482 version = le16_to_cpu(ver->lmp_subver); 483 484 out: 485 if (err) bt_dev_err(hdev, "Failed to read TI version info: %d", err); 486 kfree_skb(skb); 487 return err ? err : version; 488 } 489 490 /** 491 * download_firmware - 492 * internal function which parses through the .bts firmware 493 * script file intreprets SEND, DELAY actions only as of now 494 */ 495 static int download_firmware(struct ll_device *lldev) 496 { 497 unsigned short chip, min_ver, maj_ver; 498 int version, err, len; 499 unsigned char *ptr, *action_ptr; 500 unsigned char bts_scr_name[40]; /* 40 char long bts scr name? */ 501 const struct firmware *fw; 502 struct sk_buff *skb; 503 struct hci_command *cmd; 504 505 version = read_local_version(lldev->hu.hdev); 506 if (version < 0) 507 return version; 508 509 chip = (version & 0x7C00) >> 10; 510 min_ver = (version & 0x007F); 511 maj_ver = (version & 0x0380) >> 7; 512 if (version & 0x8000) 513 maj_ver |= 0x0008; 514 515 snprintf(bts_scr_name, sizeof(bts_scr_name), 516 "ti-connectivity/TIInit_%d.%d.%d.bts", 517 chip, maj_ver, min_ver); 518 519 err = request_firmware(&fw, bts_scr_name, &lldev->serdev->dev); 520 if (err || !fw->data || !fw->size) { 521 bt_dev_err(lldev->hu.hdev, "request_firmware failed(errno %d) for %s", 522 err, bts_scr_name); 523 return -EINVAL; 524 } 525 ptr = (void *)fw->data; 526 len = fw->size; 527 /* bts_header to remove out magic number and 528 * version 529 */ 530 ptr += sizeof(struct bts_header); 531 len -= sizeof(struct bts_header); 532 533 while (len > 0 && ptr) { 534 bt_dev_dbg(lldev->hu.hdev, " action size %d, type %d ", 535 ((struct bts_action *)ptr)->size, 536 ((struct bts_action *)ptr)->type); 537 538 action_ptr = &(((struct bts_action *)ptr)->data[0]); 539 540 switch (((struct bts_action *)ptr)->type) { 541 case ACTION_SEND_COMMAND: /* action send */ 542 bt_dev_dbg(lldev->hu.hdev, "S"); 543 cmd = (struct hci_command *)action_ptr; 544 if (cmd->opcode == HCI_VS_UPDATE_UART_HCI_BAUDRATE) { 545 /* ignore remote change 546 * baud rate HCI VS command 547 */ 548 bt_dev_warn(lldev->hu.hdev, "change remote baud rate command in firmware"); 549 break; 550 } 551 if (cmd->prefix != 1) 552 bt_dev_dbg(lldev->hu.hdev, "command type %d", cmd->prefix); 553 554 skb = __hci_cmd_sync(lldev->hu.hdev, cmd->opcode, cmd->plen, &cmd->speed, HCI_INIT_TIMEOUT); 555 if (IS_ERR(skb)) { 556 bt_dev_err(lldev->hu.hdev, "send command failed"); 557 err = PTR_ERR(skb); 558 goto out_rel_fw; 559 } 560 kfree_skb(skb); 561 break; 562 case ACTION_WAIT_EVENT: /* wait */ 563 /* no need to wait as command was synchronous */ 564 bt_dev_dbg(lldev->hu.hdev, "W"); 565 break; 566 case ACTION_DELAY: /* sleep */ 567 bt_dev_info(lldev->hu.hdev, "sleep command in scr"); 568 msleep(((struct bts_action_delay *)action_ptr)->msec); 569 break; 570 } 571 len -= (sizeof(struct bts_action) + 572 ((struct bts_action *)ptr)->size); 573 ptr += sizeof(struct bts_action) + 574 ((struct bts_action *)ptr)->size; 575 } 576 577 out_rel_fw: 578 /* fw download complete */ 579 release_firmware(fw); 580 return err; 581 } 582 583 static int ll_set_bdaddr(struct hci_dev *hdev, const bdaddr_t *bdaddr) 584 { 585 bdaddr_t bdaddr_swapped; 586 struct sk_buff *skb; 587 588 /* HCI_VS_WRITE_BD_ADDR (at least on a CC2560A chip) expects the BD 589 * address to be MSB first, but bdaddr_t has the convention of being 590 * LSB first. 591 */ 592 baswap(&bdaddr_swapped, bdaddr); 593 skb = __hci_cmd_sync(hdev, HCI_VS_WRITE_BD_ADDR, sizeof(bdaddr_t), 594 &bdaddr_swapped, HCI_INIT_TIMEOUT); 595 if (!IS_ERR(skb)) 596 kfree_skb(skb); 597 598 return PTR_ERR_OR_ZERO(skb); 599 } 600 601 static int ll_setup(struct hci_uart *hu) 602 { 603 int err, retry = 3; 604 struct ll_device *lldev; 605 struct serdev_device *serdev = hu->serdev; 606 u32 speed; 607 608 if (!serdev) 609 return 0; 610 611 lldev = serdev_device_get_drvdata(serdev); 612 613 hu->hdev->set_bdaddr = ll_set_bdaddr; 614 615 serdev_device_set_flow_control(serdev, true); 616 617 do { 618 /* Reset the Bluetooth device */ 619 gpiod_set_value_cansleep(lldev->enable_gpio, 0); 620 msleep(5); 621 gpiod_set_value_cansleep(lldev->enable_gpio, 1); 622 err = serdev_device_wait_for_cts(serdev, true, 200); 623 if (err) { 624 bt_dev_err(hu->hdev, "Failed to get CTS"); 625 return err; 626 } 627 628 err = download_firmware(lldev); 629 if (!err) 630 break; 631 632 /* Toggle BT_EN and retry */ 633 bt_dev_err(hu->hdev, "download firmware failed, retrying..."); 634 } while (retry--); 635 636 if (err) 637 return err; 638 639 /* Set BD address if one was specified at probe */ 640 if (!bacmp(&lldev->bdaddr, BDADDR_NONE)) { 641 /* This means that there was an error getting the BD address 642 * during probe, so mark the device as having a bad address. 643 */ 644 set_bit(HCI_QUIRK_INVALID_BDADDR, &hu->hdev->quirks); 645 } else if (bacmp(&lldev->bdaddr, BDADDR_ANY)) { 646 err = ll_set_bdaddr(hu->hdev, &lldev->bdaddr); 647 if (err) 648 set_bit(HCI_QUIRK_INVALID_BDADDR, &hu->hdev->quirks); 649 } 650 651 /* Operational speed if any */ 652 if (hu->oper_speed) 653 speed = hu->oper_speed; 654 else if (hu->proto->oper_speed) 655 speed = hu->proto->oper_speed; 656 else 657 speed = 0; 658 659 if (speed) { 660 __le32 speed_le = cpu_to_le32(speed); 661 struct sk_buff *skb; 662 663 skb = __hci_cmd_sync(hu->hdev, HCI_VS_UPDATE_UART_HCI_BAUDRATE, 664 sizeof(speed_le), &speed_le, 665 HCI_INIT_TIMEOUT); 666 if (!IS_ERR(skb)) { 667 kfree_skb(skb); 668 serdev_device_set_baudrate(serdev, speed); 669 } 670 } 671 672 return 0; 673 } 674 675 static const struct hci_uart_proto llp; 676 677 static int hci_ti_probe(struct serdev_device *serdev) 678 { 679 struct hci_uart *hu; 680 struct ll_device *lldev; 681 struct nvmem_cell *bdaddr_cell; 682 u32 max_speed = 3000000; 683 684 lldev = devm_kzalloc(&serdev->dev, sizeof(struct ll_device), GFP_KERNEL); 685 if (!lldev) 686 return -ENOMEM; 687 hu = &lldev->hu; 688 689 serdev_device_set_drvdata(serdev, lldev); 690 lldev->serdev = hu->serdev = serdev; 691 692 lldev->enable_gpio = devm_gpiod_get_optional(&serdev->dev, "enable", GPIOD_OUT_LOW); 693 if (IS_ERR(lldev->enable_gpio)) 694 return PTR_ERR(lldev->enable_gpio); 695 696 lldev->ext_clk = devm_clk_get(&serdev->dev, "ext_clock"); 697 if (IS_ERR(lldev->ext_clk) && PTR_ERR(lldev->ext_clk) != -ENOENT) 698 return PTR_ERR(lldev->ext_clk); 699 700 of_property_read_u32(serdev->dev.of_node, "max-speed", &max_speed); 701 hci_uart_set_speeds(hu, 115200, max_speed); 702 703 /* optional BD address from nvram */ 704 bdaddr_cell = nvmem_cell_get(&serdev->dev, "bd-address"); 705 if (IS_ERR(bdaddr_cell)) { 706 int err = PTR_ERR(bdaddr_cell); 707 708 if (err == -EPROBE_DEFER) 709 return err; 710 711 /* ENOENT means there is no matching nvmem cell and ENOSYS 712 * means that nvmem is not enabled in the kernel configuration. 713 */ 714 if (err != -ENOENT && err != -ENOSYS) { 715 /* If there was some other error, give userspace a 716 * chance to fix the problem instead of failing to load 717 * the driver. Using BDADDR_NONE as a flag that is 718 * tested later in the setup function. 719 */ 720 dev_warn(&serdev->dev, 721 "Failed to get \"bd-address\" nvmem cell (%d)\n", 722 err); 723 bacpy(&lldev->bdaddr, BDADDR_NONE); 724 } 725 } else { 726 bdaddr_t *bdaddr; 727 size_t len; 728 729 bdaddr = nvmem_cell_read(bdaddr_cell, &len); 730 nvmem_cell_put(bdaddr_cell); 731 if (IS_ERR(bdaddr)) { 732 dev_err(&serdev->dev, "Failed to read nvmem bd-address\n"); 733 return PTR_ERR(bdaddr); 734 } 735 if (len != sizeof(bdaddr_t)) { 736 dev_err(&serdev->dev, "Invalid nvmem bd-address length\n"); 737 kfree(bdaddr); 738 return -EINVAL; 739 } 740 741 /* As per the device tree bindings, the value from nvmem is 742 * expected to be MSB first, but in the kernel it is expected 743 * that bdaddr_t is LSB first. 744 */ 745 baswap(&lldev->bdaddr, bdaddr); 746 kfree(bdaddr); 747 } 748 749 return hci_uart_register_device(hu, &llp); 750 } 751 752 static void hci_ti_remove(struct serdev_device *serdev) 753 { 754 struct ll_device *lldev = serdev_device_get_drvdata(serdev); 755 756 hci_uart_unregister_device(&lldev->hu); 757 } 758 759 static const struct of_device_id hci_ti_of_match[] = { 760 { .compatible = "ti,cc2560" }, 761 { .compatible = "ti,wl1271-st" }, 762 { .compatible = "ti,wl1273-st" }, 763 { .compatible = "ti,wl1281-st" }, 764 { .compatible = "ti,wl1283-st" }, 765 { .compatible = "ti,wl1285-st" }, 766 { .compatible = "ti,wl1801-st" }, 767 { .compatible = "ti,wl1805-st" }, 768 { .compatible = "ti,wl1807-st" }, 769 { .compatible = "ti,wl1831-st" }, 770 { .compatible = "ti,wl1835-st" }, 771 { .compatible = "ti,wl1837-st" }, 772 {}, 773 }; 774 MODULE_DEVICE_TABLE(of, hci_ti_of_match); 775 776 static struct serdev_device_driver hci_ti_drv = { 777 .driver = { 778 .name = "hci-ti", 779 .of_match_table = of_match_ptr(hci_ti_of_match), 780 }, 781 .probe = hci_ti_probe, 782 .remove = hci_ti_remove, 783 }; 784 #else 785 #define ll_setup NULL 786 #endif 787 788 static const struct hci_uart_proto llp = { 789 .id = HCI_UART_LL, 790 .name = "LL", 791 .setup = ll_setup, 792 .open = ll_open, 793 .close = ll_close, 794 .recv = ll_recv, 795 .enqueue = ll_enqueue, 796 .dequeue = ll_dequeue, 797 .flush = ll_flush, 798 }; 799 800 int __init ll_init(void) 801 { 802 serdev_device_driver_register(&hci_ti_drv); 803 804 return hci_uart_register_proto(&llp); 805 } 806 807 int __exit ll_deinit(void) 808 { 809 serdev_device_driver_unregister(&hci_ti_drv); 810 811 return hci_uart_unregister_proto(&llp); 812 } 813