drivers/bluetooth/hci_ll.c

   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
  57 #include "hci_uart.h"
  58
  59 /* HCILL commands */
  60 #define HCILL_GO_TO_SLEEP_IND   0x30
  61 #define HCILL_GO_TO_SLEEP_ACK   0x31
  62 #define HCILL_WAKE_UP_IND       0x32
  63 #define HCILL_WAKE_UP_ACK       0x33
  64
  65 /* HCILL receiver States */
  66 #define HCILL_W4_PACKET_TYPE    0
  67 #define HCILL_W4_EVENT_HDR      1
  68 #define HCILL_W4_ACL_HDR        2
  69 #define HCILL_W4_SCO_HDR        3
  70 #define HCILL_W4_DATA           4
  71
  72 /* HCILL states */
  73 enum hcill_states_e {
  74         HCILL_ASLEEP,
  75         HCILL_ASLEEP_TO_AWAKE,
  76         HCILL_AWAKE,
  77         HCILL_AWAKE_TO_ASLEEP
  78 };
  79
  80 struct hcill_cmd {
  81         u8 cmd;
  82 } __packed;
  83
  84 struct ll_device {
  85         struct hci_uart hu;
  86         struct serdev_device *serdev;
  87         struct gpio_desc *enable_gpio;
  88         struct clk *ext_clk;
  89 };
  90
  91 struct ll_struct {
  92         unsigned long rx_state;
  93         unsigned long rx_count;
  94         struct sk_buff *rx_skb;
  95         struct sk_buff_head txq;
  96         spinlock_t hcill_lock;          /* HCILL state lock     */
  97         unsigned long hcill_state;      /* HCILL power state    */
  98         struct sk_buff_head tx_wait_q;  /* HCILL wait queue     */
  99 };
 100
 101 /*
 102  * Builds and sends an HCILL command packet.
 103  * These are very simple packets with only 1 cmd byte
 104  */
 105 static int send_hcill_cmd(u8 cmd, struct hci_uart *hu)
 106 {
 107         int err = 0;
 108         struct sk_buff *skb = NULL;
 109         struct ll_struct *ll = hu->priv;
 110         struct hcill_cmd *hcill_packet;
 111
 112         BT_DBG("hu %p cmd 0x%x", hu, cmd);
 113
 114         /* allocate packet */
 115         skb = bt_skb_alloc(1, GFP_ATOMIC);
 116         if (!skb) {
 117                 BT_ERR("cannot allocate memory for HCILL packet");
 118                 err = -ENOMEM;
 119                 goto out;
 120         }
 121
 122         /* prepare packet */
 123         hcill_packet = (struct hcill_cmd *) skb_put(skb, 1);
 124         hcill_packet->cmd = cmd;
 125
 126         /* send packet */
 127         skb_queue_tail(&ll->txq, skb);
 128 out:
 129         return err;
 130 }
 131
 132 /* Initialize protocol */
 133 static int ll_open(struct hci_uart *hu)
 134 {
 135         struct ll_struct *ll;
 136
 137         BT_DBG("hu %p", hu);
 138
 139         ll = kzalloc(sizeof(*ll), GFP_KERNEL);
 140         if (!ll)
 141                 return -ENOMEM;
 142
 143         skb_queue_head_init(&ll->txq);
 144         skb_queue_head_init(&ll->tx_wait_q);
 145         spin_lock_init(&ll->hcill_lock);
 146
 147         ll->hcill_state = HCILL_AWAKE;
 148
 149         hu->priv = ll;
 150
 151         if (hu->serdev) {
 152                 struct ll_device *lldev = serdev_device_get_drvdata(hu->serdev);
 153                 serdev_device_open(hu->serdev);
 154                 if (!IS_ERR(lldev->ext_clk))
 155                         clk_prepare_enable(lldev->ext_clk);
 156         }
 157
 158         return 0;
 159 }
 160
 161 /* Flush protocol data */
 162 static int ll_flush(struct hci_uart *hu)
 163 {
 164         struct ll_struct *ll = hu->priv;
 165
 166         BT_DBG("hu %p", hu);
 167
 168         skb_queue_purge(&ll->tx_wait_q);
 169         skb_queue_purge(&ll->txq);
 170
 171         return 0;
 172 }
 173
 174 /* Close protocol */
 175 static int ll_close(struct hci_uart *hu)
 176 {
 177         struct ll_struct *ll = hu->priv;
 178
 179         BT_DBG("hu %p", hu);
 180
 181         skb_queue_purge(&ll->tx_wait_q);
 182         skb_queue_purge(&ll->txq);
 183
 184         kfree_skb(ll->rx_skb);
 185
 186         if (hu->serdev) {
 187                 struct ll_device *lldev = serdev_device_get_drvdata(hu->serdev);
 188                 gpiod_set_value_cansleep(lldev->enable_gpio, 0);
 189
 190                 clk_disable_unprepare(lldev->ext_clk);
 191
 192                 serdev_device_close(hu->serdev);
 193         }
 194
 195         hu->priv = NULL;
 196
 197         kfree(ll);
 198
 199         return 0;
 200 }
 201
 202 /*
 203  * internal function, which does common work of the device wake up process:
 204  * 1. places all pending packets (waiting in tx_wait_q list) in txq list.
 205  * 2. changes internal state to HCILL_AWAKE.
 206  * Note: assumes that hcill_lock spinlock is taken,
 207  * shouldn't be called otherwise!
 208  */
 209 static void __ll_do_awake(struct ll_struct *ll)
 210 {
 211         struct sk_buff *skb = NULL;
 212
 213         while ((skb = skb_dequeue(&ll->tx_wait_q)))
 214                 skb_queue_tail(&ll->txq, skb);
 215
 216         ll->hcill_state = HCILL_AWAKE;
 217 }
 218
 219 /*
 220  * Called upon a wake-up-indication from the device
 221  */
 222 static void ll_device_want_to_wakeup(struct hci_uart *hu)
 223 {
 224         unsigned long flags;
 225         struct ll_struct *ll = hu->priv;
 226
 227         BT_DBG("hu %p", hu);
 228
 229         /* lock hcill state */
 230         spin_lock_irqsave(&ll->hcill_lock, flags);
 231
 232         switch (ll->hcill_state) {
 233         case HCILL_ASLEEP_TO_AWAKE:
 234                 /*
 235                  * This state means that both the host and the BRF chip
 236                  * have simultaneously sent a wake-up-indication packet.
 237                  * Traditionally, in this case, receiving a wake-up-indication
 238                  * was enough and an additional wake-up-ack wasn't needed.
 239                  * This has changed with the BRF6350, which does require an
 240                  * explicit wake-up-ack. Other BRF versions, which do not
 241                  * require an explicit ack here, do accept it, thus it is
 242                  * perfectly safe to always send one.
 243                  */
 244                 BT_DBG("dual wake-up-indication");
 245                 /* deliberate fall-through - do not add break */
 246         case HCILL_ASLEEP:
 247                 /* acknowledge device wake up */
 248                 if (send_hcill_cmd(HCILL_WAKE_UP_ACK, hu) < 0) {
 249                         BT_ERR("cannot acknowledge device wake up");
 250                         goto out;
 251                 }
 252                 break;
 253         default:
 254                 /* any other state is illegal */
 255                 BT_ERR("received HCILL_WAKE_UP_IND in state %ld", ll->hcill_state);
 256                 break;
 257         }
 258
 259         /* send pending packets and change state to HCILL_AWAKE */
 260         __ll_do_awake(ll);
 261
 262 out:
 263         spin_unlock_irqrestore(&ll->hcill_lock, flags);
 264
 265         /* actually send the packets */
 266         hci_uart_tx_wakeup(hu);
 267 }
 268
 269 /*
 270  * Called upon a sleep-indication from the device
 271  */
 272 static void ll_device_want_to_sleep(struct hci_uart *hu)
 273 {
 274         unsigned long flags;
 275         struct ll_struct *ll = hu->priv;
 276
 277         BT_DBG("hu %p", hu);
 278
 279         /* lock hcill state */
 280         spin_lock_irqsave(&ll->hcill_lock, flags);
 281
 282         /* sanity check */
 283         if (ll->hcill_state != HCILL_AWAKE)
 284                 BT_ERR("ERR: HCILL_GO_TO_SLEEP_IND in state %ld", ll->hcill_state);
 285
 286         /* acknowledge device sleep */
 287         if (send_hcill_cmd(HCILL_GO_TO_SLEEP_ACK, hu) < 0) {
 288                 BT_ERR("cannot acknowledge device sleep");
 289                 goto out;
 290         }
 291
 292         /* update state */
 293         ll->hcill_state = HCILL_ASLEEP;
 294
 295 out:
 296         spin_unlock_irqrestore(&ll->hcill_lock, flags);
 297
 298         /* actually send the sleep ack packet */
 299         hci_uart_tx_wakeup(hu);
 300 }
 301
 302 /*
 303  * Called upon wake-up-acknowledgement from the device
 304  */
 305 static void ll_device_woke_up(struct hci_uart *hu)
 306 {
 307         unsigned long flags;
 308         struct ll_struct *ll = hu->priv;
 309
 310         BT_DBG("hu %p", hu);
 311
 312         /* lock hcill state */
 313         spin_lock_irqsave(&ll->hcill_lock, flags);
 314
 315         /* sanity check */
 316         if (ll->hcill_state != HCILL_ASLEEP_TO_AWAKE)
 317                 BT_ERR("received HCILL_WAKE_UP_ACK in state %ld", ll->hcill_state);
 318
 319         /* send pending packets and change state to HCILL_AWAKE */
 320         __ll_do_awake(ll);
 321
 322         spin_unlock_irqrestore(&ll->hcill_lock, flags);
 323
 324         /* actually send the packets */
 325         hci_uart_tx_wakeup(hu);
 326 }
 327
 328 /* Enqueue frame for transmittion (padding, crc, etc) */
 329 /* may be called from two simultaneous tasklets */
 330 static int ll_enqueue(struct hci_uart *hu, struct sk_buff *skb)
 331 {
 332         unsigned long flags = 0;
 333         struct ll_struct *ll = hu->priv;
 334
 335         BT_DBG("hu %p skb %p", hu, skb);
 336
 337         /* Prepend skb with frame type */
 338         memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
 339
 340         /* lock hcill state */
 341         spin_lock_irqsave(&ll->hcill_lock, flags);
 342
 343         /* act according to current state */
 344         switch (ll->hcill_state) {
 345         case HCILL_AWAKE:
 346                 BT_DBG("device awake, sending normally");
 347                 skb_queue_tail(&ll->txq, skb);
 348                 break;
 349         case HCILL_ASLEEP:
 350                 BT_DBG("device asleep, waking up and queueing packet");
 351                 /* save packet for later */
 352                 skb_queue_tail(&ll->tx_wait_q, skb);
 353                 /* awake device */
 354                 if (send_hcill_cmd(HCILL_WAKE_UP_IND, hu) < 0) {
 355                         BT_ERR("cannot wake up device");
 356                         break;
 357                 }
 358                 ll->hcill_state = HCILL_ASLEEP_TO_AWAKE;
 359                 break;
 360         case HCILL_ASLEEP_TO_AWAKE:
 361                 BT_DBG("device waking up, queueing packet");
 362                 /* transient state; just keep packet for later */
 363                 skb_queue_tail(&ll->tx_wait_q, skb);
 364                 break;
 365         default:
 366                 BT_ERR("illegal hcill state: %ld (losing packet)", ll->hcill_state);
 367                 kfree_skb(skb);
 368                 break;
 369         }
 370
 371         spin_unlock_irqrestore(&ll->hcill_lock, flags);
 372
 373         return 0;
 374 }
 375
 376 static inline int ll_check_data_len(struct hci_dev *hdev, struct ll_struct *ll, int len)
 377 {
 378         int room = skb_tailroom(ll->rx_skb);
 379
 380         BT_DBG("len %d room %d", len, room);
 381
 382         if (!len) {
 383                 hci_recv_frame(hdev, ll->rx_skb);
 384         } else if (len > room) {
 385                 BT_ERR("Data length is too large");
 386                 kfree_skb(ll->rx_skb);
 387         } else {
 388                 ll->rx_state = HCILL_W4_DATA;
 389                 ll->rx_count = len;
 390                 return len;
 391         }
 392
 393         ll->rx_state = HCILL_W4_PACKET_TYPE;
 394         ll->rx_skb   = NULL;
 395         ll->rx_count = 0;
 396
 397         return 0;
 398 }
 399
 400 /* Recv data */
 401 static int ll_recv(struct hci_uart *hu, const void *data, int count)
 402 {
 403         struct ll_struct *ll = hu->priv;
 404         const char *ptr;
 405         struct hci_event_hdr *eh;
 406         struct hci_acl_hdr   *ah;
 407         struct hci_sco_hdr   *sh;
 408         int len, type, dlen;
 409
 410         BT_DBG("hu %p count %d rx_state %ld rx_count %ld", hu, count, ll->rx_state, ll->rx_count);
 411
 412         ptr = data;
 413         while (count) {
 414                 if (ll->rx_count) {
 415                         len = min_t(unsigned int, ll->rx_count, count);
 416                         skb_put_data(ll->rx_skb, ptr, len);
 417                         ll->rx_count -= len; count -= len; ptr += len;
 418
 419                         if (ll->rx_count)
 420                                 continue;
 421
 422                         switch (ll->rx_state) {
 423                         case HCILL_W4_DATA:
 424                                 BT_DBG("Complete data");
 425                                 hci_recv_frame(hu->hdev, ll->rx_skb);
 426
 427                                 ll->rx_state = HCILL_W4_PACKET_TYPE;
 428                                 ll->rx_skb = NULL;
 429                                 continue;
 430
 431                         case HCILL_W4_EVENT_HDR:
 432                                 eh = hci_event_hdr(ll->rx_skb);
 433
 434                                 BT_DBG("Event header: evt 0x%2.2x plen %d", eh->evt, eh->plen);
 435
 436                                 ll_check_data_len(hu->hdev, ll, eh->plen);
 437                                 continue;
 438
 439                         case HCILL_W4_ACL_HDR:
 440                                 ah = hci_acl_hdr(ll->rx_skb);
 441                                 dlen = __le16_to_cpu(ah->dlen);
 442
 443                                 BT_DBG("ACL header: dlen %d", dlen);
 444
 445                                 ll_check_data_len(hu->hdev, ll, dlen);
 446                                 continue;
 447
 448                         case HCILL_W4_SCO_HDR:
 449                                 sh = hci_sco_hdr(ll->rx_skb);
 450
 451                                 BT_DBG("SCO header: dlen %d", sh->dlen);
 452
 453                                 ll_check_data_len(hu->hdev, ll, sh->dlen);
 454                                 continue;
 455                         }
 456                 }
 457
 458                 /* HCILL_W4_PACKET_TYPE */
 459                 switch (*ptr) {
 460                 case HCI_EVENT_PKT:
 461                         BT_DBG("Event packet");
 462                         ll->rx_state = HCILL_W4_EVENT_HDR;
 463                         ll->rx_count = HCI_EVENT_HDR_SIZE;
 464                         type = HCI_EVENT_PKT;
 465                         break;
 466
 467                 case HCI_ACLDATA_PKT:
 468                         BT_DBG("ACL packet");
 469                         ll->rx_state = HCILL_W4_ACL_HDR;
 470                         ll->rx_count = HCI_ACL_HDR_SIZE;
 471                         type = HCI_ACLDATA_PKT;
 472                         break;
 473
 474                 case HCI_SCODATA_PKT:
 475                         BT_DBG("SCO packet");
 476                         ll->rx_state = HCILL_W4_SCO_HDR;
 477                         ll->rx_count = HCI_SCO_HDR_SIZE;
 478                         type = HCI_SCODATA_PKT;
 479                         break;
 480
 481                 /* HCILL signals */
 482                 case HCILL_GO_TO_SLEEP_IND:
 483                         BT_DBG("HCILL_GO_TO_SLEEP_IND packet");
 484                         ll_device_want_to_sleep(hu);
 485                         ptr++; count--;
 486                         continue;
 487
 488                 case HCILL_GO_TO_SLEEP_ACK:
 489                         /* shouldn't happen */
 490                         BT_ERR("received HCILL_GO_TO_SLEEP_ACK (in state %ld)", ll->hcill_state);
 491                         ptr++; count--;
 492                         continue;
 493
 494                 case HCILL_WAKE_UP_IND:
 495                         BT_DBG("HCILL_WAKE_UP_IND packet");
 496                         ll_device_want_to_wakeup(hu);
 497                         ptr++; count--;
 498                         continue;
 499
 500                 case HCILL_WAKE_UP_ACK:
 501                         BT_DBG("HCILL_WAKE_UP_ACK packet");
 502                         ll_device_woke_up(hu);
 503                         ptr++; count--;
 504                         continue;
 505
 506                 default:
 507                         BT_ERR("Unknown HCI packet type %2.2x", (__u8)*ptr);
 508                         hu->hdev->stat.err_rx++;
 509                         ptr++; count--;
 510                         continue;
 511                 }
 512
 513                 ptr++; count--;
 514
 515                 /* Allocate packet */
 516                 ll->rx_skb = bt_skb_alloc(HCI_MAX_FRAME_SIZE, GFP_ATOMIC);
 517                 if (!ll->rx_skb) {
 518                         BT_ERR("Can't allocate mem for new packet");
 519                         ll->rx_state = HCILL_W4_PACKET_TYPE;
 520                         ll->rx_count = 0;
 521                         return -ENOMEM;
 522                 }
 523
 524                 hci_skb_pkt_type(ll->rx_skb) = type;
 525         }
 526
 527         return count;
 528 }
 529
 530 static struct sk_buff *ll_dequeue(struct hci_uart *hu)
 531 {
 532         struct ll_struct *ll = hu->priv;
 533         return skb_dequeue(&ll->txq);
 534 }
 535
 536 #if IS_ENABLED(CONFIG_SERIAL_DEV_BUS)
 537 static int read_local_version(struct hci_dev *hdev)
 538 {
 539         int err = 0;
 540         unsigned short version = 0;
 541         struct sk_buff *skb;
 542         struct hci_rp_read_local_version *ver;
 543
 544         skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_VERSION, 0, NULL, HCI_INIT_TIMEOUT);
 545         if (IS_ERR(skb)) {
 546                 bt_dev_err(hdev, "Reading TI version information failed (%ld)",
 547                            PTR_ERR(skb));
 548                 return PTR_ERR(skb);
 549         }
 550         if (skb->len != sizeof(*ver)) {
 551                 err = -EILSEQ;
 552                 goto out;
 553         }
 554
 555         ver = (struct hci_rp_read_local_version *)skb->data;
 556         if (le16_to_cpu(ver->manufacturer) != 13) {
 557                 err = -ENODEV;
 558                 goto out;
 559         }
 560
 561         version = le16_to_cpu(ver->lmp_subver);
 562
 563 out:
 564         if (err) bt_dev_err(hdev, "Failed to read TI version info: %d", err);
 565         kfree_skb(skb);
 566         return err ? err : version;
 567 }
 568
 569 /**
 570  * download_firmware -
 571  *      internal function which parses through the .bts firmware
 572  *      script file intreprets SEND, DELAY actions only as of now
 573  */
 574 static int download_firmware(struct ll_device *lldev)
 575 {
 576         unsigned short chip, min_ver, maj_ver;
 577         int version, err, len;
 578         unsigned char *ptr, *action_ptr;
 579         unsigned char bts_scr_name[40]; /* 40 char long bts scr name? */
 580         const struct firmware *fw;
 581         struct sk_buff *skb;
 582         struct hci_command *cmd;
 583
 584         version = read_local_version(lldev->hu.hdev);
 585         if (version < 0)
 586                 return version;
 587
 588         chip = (version & 0x7C00) >> 10;
 589         min_ver = (version & 0x007F);
 590         maj_ver = (version & 0x0380) >> 7;
 591         if (version & 0x8000)
 592                 maj_ver |= 0x0008;
 593
 594         snprintf(bts_scr_name, sizeof(bts_scr_name),
 595                  "ti-connectivity/TIInit_%d.%d.%d.bts",
 596                  chip, maj_ver, min_ver);
 597
 598         err = request_firmware(&fw, bts_scr_name, &lldev->serdev->dev);
 599         if (err || !fw->data || !fw->size) {
 600                 bt_dev_err(lldev->hu.hdev, "request_firmware failed(errno %d) for %s",
 601                            err, bts_scr_name);
 602                 return -EINVAL;
 603         }
 604         ptr = (void *)fw->data;
 605         len = fw->size;
 606         /* bts_header to remove out magic number and
 607          * version
 608          */
 609         ptr += sizeof(struct bts_header);
 610         len -= sizeof(struct bts_header);
 611
 612         while (len > 0 && ptr) {
 613                 bt_dev_dbg(lldev->hu.hdev, " action size %d, type %d ",
 614                            ((struct bts_action *)ptr)->size,
 615                            ((struct bts_action *)ptr)->type);
 616
 617                 action_ptr = &(((struct bts_action *)ptr)->data[0]);
 618
 619                 switch (((struct bts_action *)ptr)->type) {
 620                 case ACTION_SEND_COMMAND:       /* action send */
 621                         bt_dev_dbg(lldev->hu.hdev, "S");
 622                         cmd = (struct hci_command *)action_ptr;
 623                         if (cmd->opcode == 0xff36) {
 624                                 /* ignore remote change
 625                                  * baud rate HCI VS command */
 626                                 bt_dev_warn(lldev->hu.hdev, "change remote baud rate command in firmware");
 627                                 break;
 628                         }
 629                         if (cmd->prefix != 1)
 630                                 bt_dev_dbg(lldev->hu.hdev, "command type %d\n", cmd->prefix);
 631
 632                         skb = __hci_cmd_sync(lldev->hu.hdev, cmd->opcode, cmd->plen, &cmd->speed, HCI_INIT_TIMEOUT);
 633                         if (IS_ERR(skb)) {
 634                                 bt_dev_err(lldev->hu.hdev, "send command failed\n");
 635                                 err = PTR_ERR(skb);
 636                                 goto out_rel_fw;
 637                         }
 638                         kfree_skb(skb);
 639                         break;
 640                 case ACTION_WAIT_EVENT:  /* wait */
 641                         /* no need to wait as command was synchronous */
 642                         bt_dev_dbg(lldev->hu.hdev, "W");
 643                         break;
 644                 case ACTION_DELAY:      /* sleep */
 645                         bt_dev_info(lldev->hu.hdev, "sleep command in scr");
 646                         mdelay(((struct bts_action_delay *)action_ptr)->msec);
 647                         break;
 648                 }
 649                 len -= (sizeof(struct bts_action) +
 650                         ((struct bts_action *)ptr)->size);
 651                 ptr += sizeof(struct bts_action) +
 652                         ((struct bts_action *)ptr)->size;
 653         }
 654
 655 out_rel_fw:
 656         /* fw download complete */
 657         release_firmware(fw);
 658         return err;
 659 }
 660
 661 static int ll_setup(struct hci_uart *hu)
 662 {
 663         int err, retry = 3;
 664         struct ll_device *lldev;
 665         struct serdev_device *serdev = hu->serdev;
 666         u32 speed;
 667
 668         if (!serdev)
 669                 return 0;
 670
 671         lldev = serdev_device_get_drvdata(serdev);
 672
 673         serdev_device_set_flow_control(serdev, true);
 674
 675         do {
 676                 /* Configure BT_EN to HIGH state */
 677                 gpiod_set_value_cansleep(lldev->enable_gpio, 0);
 678                 msleep(5);
 679                 gpiod_set_value_cansleep(lldev->enable_gpio, 1);
 680                 msleep(100);
 681
 682                 err = download_firmware(lldev);
 683                 if (!err)
 684                         break;
 685
 686                 /* Toggle BT_EN and retry */
 687                 bt_dev_err(hu->hdev, "download firmware failed, retrying...");
 688         } while (retry--);
 689
 690         if (err)
 691                 return err;
 692
 693         /* Operational speed if any */
 694         if (hu->oper_speed)
 695                 speed = hu->oper_speed;
 696         else if (hu->proto->oper_speed)
 697                 speed = hu->proto->oper_speed;
 698         else
 699                 speed = 0;
 700
 701         if (speed) {
 702                 struct sk_buff *skb = __hci_cmd_sync(hu->hdev, 0xff36, sizeof(speed), &speed, HCI_INIT_TIMEOUT);
 703                 if (!IS_ERR(skb)) {
 704                         kfree_skb(skb);
 705                         serdev_device_set_baudrate(serdev, speed);
 706                 }
 707         }
 708
 709         return 0;
 710 }
 711
 712 static const struct hci_uart_proto llp;
 713
 714 static int hci_ti_probe(struct serdev_device *serdev)
 715 {
 716         struct hci_uart *hu;
 717         struct ll_device *lldev;
 718         u32 max_speed = 3000000;
 719
 720         lldev = devm_kzalloc(&serdev->dev, sizeof(struct ll_device), GFP_KERNEL);
 721         if (!lldev)
 722                 return -ENOMEM;
 723         hu = &lldev->hu;
 724
 725         serdev_device_set_drvdata(serdev, lldev);
 726         lldev->serdev = hu->serdev = serdev;
 727
 728         lldev->enable_gpio = devm_gpiod_get_optional(&serdev->dev, "enable", GPIOD_OUT_LOW);
 729         if (IS_ERR(lldev->enable_gpio))
 730                 return PTR_ERR(lldev->enable_gpio);
 731
 732         lldev->ext_clk = devm_clk_get(&serdev->dev, "ext_clock");
 733         if (IS_ERR(lldev->ext_clk) && PTR_ERR(lldev->ext_clk) != -ENOENT)
 734                 return PTR_ERR(lldev->ext_clk);
 735
 736         of_property_read_u32(serdev->dev.of_node, "max-speed", &max_speed);
 737         hci_uart_set_speeds(hu, 115200, max_speed);
 738
 739         return hci_uart_register_device(hu, &llp);
 740 }
 741
 742 static void hci_ti_remove(struct serdev_device *serdev)
 743 {
 744         struct ll_device *lldev = serdev_device_get_drvdata(serdev);
 745         struct hci_uart *hu = &lldev->hu;
 746         struct hci_dev *hdev = hu->hdev;
 747
 748         cancel_work_sync(&hu->write_work);
 749
 750         hci_unregister_dev(hdev);
 751         hci_free_dev(hdev);
 752         hu->proto->close(hu);
 753 }
 754
 755 static const struct of_device_id hci_ti_of_match[] = {
 756         { .compatible = "ti,wl1271-st" },
 757         { .compatible = "ti,wl1273-st" },
 758         { .compatible = "ti,wl1281-st" },
 759         { .compatible = "ti,wl1283-st" },
 760         { .compatible = "ti,wl1285-st" },
 761         { .compatible = "ti,wl1801-st" },
 762         { .compatible = "ti,wl1805-st" },
 763         { .compatible = "ti,wl1807-st" },
 764         { .compatible = "ti,wl1831-st" },
 765         { .compatible = "ti,wl1835-st" },
 766         { .compatible = "ti,wl1837-st" },
 767         {},
 768 };
 769 MODULE_DEVICE_TABLE(of, hci_ti_of_match);
 770
 771 static struct serdev_device_driver hci_ti_drv = {
 772         .driver         = {
 773                 .name   = "hci-ti",
 774                 .of_match_table = of_match_ptr(hci_ti_of_match),
 775         },
 776         .probe  = hci_ti_probe,
 777         .remove = hci_ti_remove,
 778 };
 779 #else
 780 #define ll_setup NULL
 781 #endif
 782
 783 static const struct hci_uart_proto llp = {
 784         .id             = HCI_UART_LL,
 785         .name           = "LL",
 786         .setup          = ll_setup,
 787         .open           = ll_open,
 788         .close          = ll_close,
 789         .recv           = ll_recv,
 790         .enqueue        = ll_enqueue,
 791         .dequeue        = ll_dequeue,
 792         .flush          = ll_flush,
 793 };
 794
 795 int __init ll_init(void)
 796 {
 797         serdev_device_driver_register(&hci_ti_drv);
 798
 799         return hci_uart_register_proto(&llp);
 800 }
 801
 802 int __exit ll_deinit(void)
 803 {
 804         serdev_device_driver_unregister(&hci_ti_drv);
 805
 806         return hci_uart_unregister_proto(&llp);
 807 }