drivers/bluetooth/hci_nokia.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Bluetooth HCI UART H4 driver with Nokia Extensions AKA Nokia H4+
   4  *
   5  *  Copyright (C) 2015 Marcel Holtmann <[email protected]>
   6  *  Copyright (C) 2015-2017 Sebastian Reichel <[email protected]>
   7  */
   8
   9 #include <linux/clk.h>
  10 #include <linux/errno.h>
  11 #include <linux/firmware.h>
  12 #include <linux/gpio/consumer.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/kernel.h>
  15 #include <linux/module.h>
  16 #include <linux/of.h>
  17 #include <linux/pm_runtime.h>
  18 #include <linux/serdev.h>
  19 #include <linux/skbuff.h>
  20 #include <linux/slab.h>
  21 #include <linux/string.h>
  22 #include <linux/types.h>
  23 #include <linux/unaligned.h>
  24 #include <net/bluetooth/bluetooth.h>
  25 #include <net/bluetooth/hci_core.h>
  26
  27 #include "hci_uart.h"
  28 #include "btbcm.h"
  29
  30 #define VERSION "0.1"
  31
  32 #define NOKIA_ID_BCM2048        0x04
  33 #define NOKIA_ID_TI1271         0x31
  34
  35 #define FIRMWARE_BCM2048        "nokia/bcmfw.bin"
  36 #define FIRMWARE_TI1271         "nokia/ti1273.bin"
  37
  38 #define HCI_NOKIA_NEG_PKT       0x06
  39 #define HCI_NOKIA_ALIVE_PKT     0x07
  40 #define HCI_NOKIA_RADIO_PKT     0x08
  41
  42 #define HCI_NOKIA_NEG_HDR_SIZE          1
  43 #define HCI_NOKIA_MAX_NEG_SIZE          255
  44 #define HCI_NOKIA_ALIVE_HDR_SIZE        1
  45 #define HCI_NOKIA_MAX_ALIVE_SIZE        255
  46 #define HCI_NOKIA_RADIO_HDR_SIZE        2
  47 #define HCI_NOKIA_MAX_RADIO_SIZE        255
  48
  49 #define NOKIA_PROTO_PKT         0x44
  50 #define NOKIA_PROTO_BYTE        0x4c
  51
  52 #define NOKIA_NEG_REQ           0x00
  53 #define NOKIA_NEG_ACK           0x20
  54 #define NOKIA_NEG_NAK           0x40
  55
  56 #define H4_TYPE_SIZE            1
  57
  58 #define NOKIA_RECV_ALIVE \
  59         .type = HCI_NOKIA_ALIVE_PKT, \
  60         .hlen = HCI_NOKIA_ALIVE_HDR_SIZE, \
  61         .loff = 0, \
  62         .lsize = 1, \
  63         .maxlen = HCI_NOKIA_MAX_ALIVE_SIZE \
  64
  65 #define NOKIA_RECV_NEG \
  66         .type = HCI_NOKIA_NEG_PKT, \
  67         .hlen = HCI_NOKIA_NEG_HDR_SIZE, \
  68         .loff = 0, \
  69         .lsize = 1, \
  70         .maxlen = HCI_NOKIA_MAX_NEG_SIZE \
  71
  72 #define NOKIA_RECV_RADIO \
  73         .type = HCI_NOKIA_RADIO_PKT, \
  74         .hlen = HCI_NOKIA_RADIO_HDR_SIZE, \
  75         .loff = 1, \
  76         .lsize = 1, \
  77         .maxlen = HCI_NOKIA_MAX_RADIO_SIZE \
  78
  79 struct hci_nokia_neg_hdr {
  80         u8      dlen;
  81 } __packed;
  82
  83 struct hci_nokia_neg_cmd {
  84         u8      ack;
  85         u16     baud;
  86         u16     unused1;
  87         u8      proto;
  88         u16     sys_clk;
  89         u16     unused2;
  90 } __packed;
  91
  92 #define NOKIA_ALIVE_REQ   0x55
  93 #define NOKIA_ALIVE_RESP  0xcc
  94
  95 struct hci_nokia_alive_hdr {
  96         u8      dlen;
  97 } __packed;
  98
  99 struct hci_nokia_alive_pkt {
 100         u8      mid;
 101         u8      unused;
 102 } __packed;
 103
 104 struct hci_nokia_neg_evt {
 105         u8      ack;
 106         u16     baud;
 107         u16     unused1;
 108         u8      proto;
 109         u16     sys_clk;
 110         u16     unused2;
 111         u8      man_id;
 112         u8      ver_id;
 113 } __packed;
 114
 115 #define MAX_BAUD_RATE           3692300
 116 #define SETUP_BAUD_RATE         921600
 117 #define INIT_BAUD_RATE          120000
 118
 119 struct nokia_bt_dev {
 120         struct hci_uart hu;
 121         struct serdev_device *serdev;
 122
 123         struct gpio_desc *reset;
 124         struct gpio_desc *wakeup_host;
 125         struct gpio_desc *wakeup_bt;
 126         unsigned long sysclk_speed;
 127
 128         int wake_irq;
 129         struct sk_buff *rx_skb;
 130         struct sk_buff_head txq;
 131         bdaddr_t bdaddr;
 132
 133         int init_error;
 134         struct completion init_completion;
 135
 136         u8 man_id;
 137         u8 ver_id;
 138
 139         bool initialized;
 140         bool tx_enabled;
 141         bool rx_enabled;
 142 };
 143
 144 static int nokia_enqueue(struct hci_uart *hu, struct sk_buff *skb);
 145
 146 static void nokia_flow_control(struct serdev_device *serdev, bool enable)
 147 {
 148         if (enable) {
 149                 serdev_device_set_rts(serdev, true);
 150                 serdev_device_set_flow_control(serdev, true);
 151         } else {
 152                 serdev_device_set_flow_control(serdev, false);
 153                 serdev_device_set_rts(serdev, false);
 154         }
 155 }
 156
 157 static irqreturn_t wakeup_handler(int irq, void *data)
 158 {
 159         struct nokia_bt_dev *btdev = data;
 160         struct device *dev = &btdev->serdev->dev;
 161         int wake_state = gpiod_get_value(btdev->wakeup_host);
 162
 163         if (btdev->rx_enabled == wake_state)
 164                 return IRQ_HANDLED;
 165
 166         if (wake_state)
 167                 pm_runtime_get(dev);
 168         else
 169                 pm_runtime_put(dev);
 170
 171         btdev->rx_enabled = wake_state;
 172
 173         return IRQ_HANDLED;
 174 }
 175
 176 static int nokia_reset(struct hci_uart *hu)
 177 {
 178         struct nokia_bt_dev *btdev = hu->priv;
 179         struct device *dev = &btdev->serdev->dev;
 180         int err;
 181
 182         /* reset routine */
 183         gpiod_set_value_cansleep(btdev->reset, 1);
 184         gpiod_set_value_cansleep(btdev->wakeup_bt, 1);
 185
 186         msleep(100);
 187
 188         /* safety check */
 189         err = gpiod_get_value_cansleep(btdev->wakeup_host);
 190         if (err == 1) {
 191                 dev_err(dev, "reset: host wakeup not low!");
 192                 return -EPROTO;
 193         }
 194
 195         /* flush queue */
 196         serdev_device_write_flush(btdev->serdev);
 197
 198         /* init uart */
 199         nokia_flow_control(btdev->serdev, false);
 200         serdev_device_set_baudrate(btdev->serdev, INIT_BAUD_RATE);
 201
 202         gpiod_set_value_cansleep(btdev->reset, 0);
 203
 204         /* wait for cts */
 205         err = serdev_device_wait_for_cts(btdev->serdev, true, 200);
 206         if (err < 0) {
 207                 dev_err(dev, "CTS not received: %d", err);
 208                 return err;
 209         }
 210
 211         nokia_flow_control(btdev->serdev, true);
 212
 213         return 0;
 214 }
 215
 216 static int nokia_send_alive_packet(struct hci_uart *hu)
 217 {
 218         struct nokia_bt_dev *btdev = hu->priv;
 219         struct device *dev = &btdev->serdev->dev;
 220         struct hci_nokia_alive_hdr *hdr;
 221         struct hci_nokia_alive_pkt *pkt;
 222         struct sk_buff *skb;
 223         int len;
 224
 225         init_completion(&btdev->init_completion);
 226
 227         len = H4_TYPE_SIZE + sizeof(*hdr) + sizeof(*pkt);
 228         skb = bt_skb_alloc(len, GFP_KERNEL);
 229         if (!skb)
 230                 return -ENOMEM;
 231
 232         hci_skb_pkt_type(skb) = HCI_NOKIA_ALIVE_PKT;
 233         memset(skb->data, 0x00, len);
 234
 235         hdr = skb_put(skb, sizeof(*hdr));
 236         hdr->dlen = sizeof(*pkt);
 237         pkt = skb_put(skb, sizeof(*pkt));
 238         pkt->mid = NOKIA_ALIVE_REQ;
 239
 240         nokia_enqueue(hu, skb);
 241         hci_uart_tx_wakeup(hu);
 242
 243         dev_dbg(dev, "Alive sent");
 244
 245         if (!wait_for_completion_interruptible_timeout(&btdev->init_completion,
 246                 msecs_to_jiffies(1000))) {
 247                 return -ETIMEDOUT;
 248         }
 249
 250         if (btdev->init_error < 0)
 251                 return btdev->init_error;
 252
 253         return 0;
 254 }
 255
 256 static int nokia_send_negotiation(struct hci_uart *hu)
 257 {
 258         struct nokia_bt_dev *btdev = hu->priv;
 259         struct device *dev = &btdev->serdev->dev;
 260         struct hci_nokia_neg_cmd *neg_cmd;
 261         struct hci_nokia_neg_hdr *neg_hdr;
 262         struct sk_buff *skb;
 263         int len, err;
 264         u16 baud = DIV_ROUND_CLOSEST(btdev->sysclk_speed * 10, SETUP_BAUD_RATE);
 265         int sysclk = btdev->sysclk_speed / 1000;
 266
 267         len = H4_TYPE_SIZE + sizeof(*neg_hdr) + sizeof(*neg_cmd);
 268         skb = bt_skb_alloc(len, GFP_KERNEL);
 269         if (!skb)
 270                 return -ENOMEM;
 271
 272         hci_skb_pkt_type(skb) = HCI_NOKIA_NEG_PKT;
 273
 274         neg_hdr = skb_put(skb, sizeof(*neg_hdr));
 275         neg_hdr->dlen = sizeof(*neg_cmd);
 276
 277         neg_cmd = skb_put(skb, sizeof(*neg_cmd));
 278         neg_cmd->ack = NOKIA_NEG_REQ;
 279         neg_cmd->baud = cpu_to_le16(baud);
 280         neg_cmd->unused1 = 0x0000;
 281         neg_cmd->proto = NOKIA_PROTO_BYTE;
 282         neg_cmd->sys_clk = cpu_to_le16(sysclk);
 283         neg_cmd->unused2 = 0x0000;
 284
 285         btdev->init_error = 0;
 286         init_completion(&btdev->init_completion);
 287
 288         nokia_enqueue(hu, skb);
 289         hci_uart_tx_wakeup(hu);
 290
 291         dev_dbg(dev, "Negotiation sent");
 292
 293         if (!wait_for_completion_interruptible_timeout(&btdev->init_completion,
 294                 msecs_to_jiffies(10000))) {
 295                 return -ETIMEDOUT;
 296         }
 297
 298         if (btdev->init_error < 0)
 299                 return btdev->init_error;
 300
 301         /* Change to previously negotiated speed. Flow Control
 302          * is disabled until bluetooth adapter is ready to avoid
 303          * broken bytes being received.
 304          */
 305         nokia_flow_control(btdev->serdev, false);
 306         serdev_device_set_baudrate(btdev->serdev, SETUP_BAUD_RATE);
 307         err = serdev_device_wait_for_cts(btdev->serdev, true, 200);
 308         if (err < 0) {
 309                 dev_err(dev, "CTS not received: %d", err);
 310                 return err;
 311         }
 312         nokia_flow_control(btdev->serdev, true);
 313
 314         dev_dbg(dev, "Negotiation successful");
 315
 316         return 0;
 317 }
 318
 319 static int nokia_setup_fw(struct hci_uart *hu)
 320 {
 321         struct nokia_bt_dev *btdev = hu->priv;
 322         struct device *dev = &btdev->serdev->dev;
 323         const char *fwname;
 324         const struct firmware *fw;
 325         const u8 *fw_ptr;
 326         size_t fw_size;
 327         int err;
 328
 329         dev_dbg(dev, "setup firmware");
 330
 331         if (btdev->man_id == NOKIA_ID_BCM2048) {
 332                 fwname = FIRMWARE_BCM2048;
 333         } else if (btdev->man_id == NOKIA_ID_TI1271) {
 334                 fwname = FIRMWARE_TI1271;
 335         } else {
 336                 dev_err(dev, "Unsupported bluetooth device!");
 337                 return -ENODEV;
 338         }
 339
 340         err = request_firmware(&fw, fwname, dev);
 341         if (err < 0) {
 342                 dev_err(dev, "%s: Failed to load Nokia firmware file (%d)",
 343                         hu->hdev->name, err);
 344                 return err;
 345         }
 346
 347         fw_ptr = fw->data;
 348         fw_size = fw->size;
 349
 350         while (fw_size >= 4) {
 351                 u16 pkt_size = get_unaligned_le16(fw_ptr);
 352                 u8 pkt_type = fw_ptr[2];
 353                 const struct hci_command_hdr *cmd;
 354                 u16 opcode;
 355                 struct sk_buff *skb;
 356
 357                 switch (pkt_type) {
 358                 case HCI_COMMAND_PKT:
 359                         cmd = (struct hci_command_hdr *)(fw_ptr + 3);
 360                         opcode = le16_to_cpu(cmd->opcode);
 361
 362                         skb = __hci_cmd_sync(hu->hdev, opcode, cmd->plen,
 363                                              fw_ptr + 3 + HCI_COMMAND_HDR_SIZE,
 364                                              HCI_INIT_TIMEOUT);
 365                         if (IS_ERR(skb)) {
 366                                 err = PTR_ERR(skb);
 367                                 dev_err(dev, "%s: FW command %04x failed (%d)",
 368                                        hu->hdev->name, opcode, err);
 369                                 goto done;
 370                         }
 371                         kfree_skb(skb);
 372                         break;
 373                 case HCI_NOKIA_RADIO_PKT:
 374                 case HCI_NOKIA_NEG_PKT:
 375                 case HCI_NOKIA_ALIVE_PKT:
 376                         break;
 377                 }
 378
 379                 fw_ptr += pkt_size + 2;
 380                 fw_size -= pkt_size + 2;
 381         }
 382
 383 done:
 384         release_firmware(fw);
 385         return err;
 386 }
 387
 388 static int nokia_setup(struct hci_uart *hu)
 389 {
 390         struct nokia_bt_dev *btdev = hu->priv;
 391         struct device *dev = &btdev->serdev->dev;
 392         int err;
 393
 394         btdev->initialized = false;
 395
 396         nokia_flow_control(btdev->serdev, false);
 397
 398         pm_runtime_get_sync(dev);
 399
 400         if (btdev->tx_enabled) {
 401                 gpiod_set_value_cansleep(btdev->wakeup_bt, 0);
 402                 pm_runtime_put(&btdev->serdev->dev);
 403                 btdev->tx_enabled = false;
 404         }
 405
 406         dev_dbg(dev, "protocol setup");
 407
 408         /* 0. reset connection */
 409         err = nokia_reset(hu);
 410         if (err < 0) {
 411                 dev_err(dev, "Reset failed: %d", err);
 412                 goto out;
 413         }
 414
 415         /* 1. negotiate speed etc */
 416         err = nokia_send_negotiation(hu);
 417         if (err < 0) {
 418                 dev_err(dev, "Negotiation failed: %d", err);
 419                 goto out;
 420         }
 421
 422         /* 2. verify correct setup using alive packet */
 423         err = nokia_send_alive_packet(hu);
 424         if (err < 0) {
 425                 dev_err(dev, "Alive check failed: %d", err);
 426                 goto out;
 427         }
 428
 429         /* 3. send firmware */
 430         err = nokia_setup_fw(hu);
 431         if (err < 0) {
 432                 dev_err(dev, "Could not setup FW: %d", err);
 433                 goto out;
 434         }
 435
 436         nokia_flow_control(btdev->serdev, false);
 437         serdev_device_set_baudrate(btdev->serdev, MAX_BAUD_RATE);
 438         nokia_flow_control(btdev->serdev, true);
 439
 440         if (btdev->man_id == NOKIA_ID_BCM2048) {
 441                 hu->hdev->set_bdaddr = btbcm_set_bdaddr;
 442                 set_bit(HCI_QUIRK_INVALID_BDADDR, &hu->hdev->quirks);
 443                 dev_dbg(dev, "bcm2048 has invalid bluetooth address!");
 444         }
 445
 446         dev_dbg(dev, "protocol setup done!");
 447
 448         gpiod_set_value_cansleep(btdev->wakeup_bt, 0);
 449         pm_runtime_put(dev);
 450         btdev->tx_enabled = false;
 451         btdev->initialized = true;
 452
 453         return 0;
 454 out:
 455         pm_runtime_put(dev);
 456
 457         return err;
 458 }
 459
 460 static int nokia_open(struct hci_uart *hu)
 461 {
 462         struct device *dev = &hu->serdev->dev;
 463
 464         dev_dbg(dev, "protocol open");
 465
 466         pm_runtime_enable(dev);
 467
 468         return 0;
 469 }
 470
 471 static int nokia_flush(struct hci_uart *hu)
 472 {
 473         struct nokia_bt_dev *btdev = hu->priv;
 474
 475         dev_dbg(&btdev->serdev->dev, "flush device");
 476
 477         skb_queue_purge(&btdev->txq);
 478
 479         return 0;
 480 }
 481
 482 static int nokia_close(struct hci_uart *hu)
 483 {
 484         struct nokia_bt_dev *btdev = hu->priv;
 485         struct device *dev = &btdev->serdev->dev;
 486
 487         dev_dbg(dev, "close device");
 488
 489         btdev->initialized = false;
 490
 491         skb_queue_purge(&btdev->txq);
 492
 493         kfree_skb(btdev->rx_skb);
 494
 495         /* disable module */
 496         gpiod_set_value(btdev->reset, 1);
 497         gpiod_set_value(btdev->wakeup_bt, 0);
 498
 499         pm_runtime_disable(&btdev->serdev->dev);
 500
 501         return 0;
 502 }
 503
 504 /* Enqueue frame for transmittion (padding, crc, etc) */
 505 static int nokia_enqueue(struct hci_uart *hu, struct sk_buff *skb)
 506 {
 507         struct nokia_bt_dev *btdev = hu->priv;
 508         int err;
 509
 510         /* Prepend skb with frame type */
 511         memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
 512
 513         /* Packets must be word aligned */
 514         if (skb->len % 2) {
 515                 err = skb_pad(skb, 1);
 516                 if (err)
 517                         return err;
 518                 skb_put(skb, 1);
 519         }
 520
 521         skb_queue_tail(&btdev->txq, skb);
 522
 523         return 0;
 524 }
 525
 526 static int nokia_recv_negotiation_packet(struct hci_dev *hdev,
 527                                          struct sk_buff *skb)
 528 {
 529         struct hci_uart *hu = hci_get_drvdata(hdev);
 530         struct nokia_bt_dev *btdev = hu->priv;
 531         struct device *dev = &btdev->serdev->dev;
 532         struct hci_nokia_neg_hdr *hdr;
 533         struct hci_nokia_neg_evt *evt;
 534         int ret = 0;
 535
 536         hdr = (struct hci_nokia_neg_hdr *)skb->data;
 537         if (hdr->dlen != sizeof(*evt)) {
 538                 btdev->init_error = -EIO;
 539                 ret = -EIO;
 540                 goto finish_neg;
 541         }
 542
 543         evt = skb_pull(skb, sizeof(*hdr));
 544
 545         if (evt->ack != NOKIA_NEG_ACK) {
 546                 dev_err(dev, "Negotiation received: wrong reply");
 547                 btdev->init_error = -EINVAL;
 548                 ret = -EINVAL;
 549                 goto finish_neg;
 550         }
 551
 552         btdev->man_id = evt->man_id;
 553         btdev->ver_id = evt->ver_id;
 554
 555         dev_dbg(dev, "Negotiation received: baud=%u:clk=%u:manu=%u:vers=%u",
 556                 evt->baud, evt->sys_clk, evt->man_id, evt->ver_id);
 557
 558 finish_neg:
 559         complete(&btdev->init_completion);
 560         kfree_skb(skb);
 561         return ret;
 562 }
 563
 564 static int nokia_recv_alive_packet(struct hci_dev *hdev, struct sk_buff *skb)
 565 {
 566         struct hci_uart *hu = hci_get_drvdata(hdev);
 567         struct nokia_bt_dev *btdev = hu->priv;
 568         struct device *dev = &btdev->serdev->dev;
 569         struct hci_nokia_alive_hdr *hdr;
 570         struct hci_nokia_alive_pkt *pkt;
 571         int ret = 0;
 572
 573         hdr = (struct hci_nokia_alive_hdr *)skb->data;
 574         if (hdr->dlen != sizeof(*pkt)) {
 575                 dev_err(dev, "Corrupted alive message");
 576                 btdev->init_error = -EIO;
 577                 ret = -EIO;
 578                 goto finish_alive;
 579         }
 580
 581         pkt = skb_pull(skb, sizeof(*hdr));
 582
 583         if (pkt->mid != NOKIA_ALIVE_RESP) {
 584                 dev_err(dev, "Alive received: invalid response: 0x%02x!",
 585                         pkt->mid);
 586                 btdev->init_error = -EINVAL;
 587                 ret = -EINVAL;
 588                 goto finish_alive;
 589         }
 590
 591         dev_dbg(dev, "Alive received");
 592
 593 finish_alive:
 594         complete(&btdev->init_completion);
 595         kfree_skb(skb);
 596         return ret;
 597 }
 598
 599 static int nokia_recv_radio(struct hci_dev *hdev, struct sk_buff *skb)
 600 {
 601         /* Packets received on the dedicated radio channel are
 602          * HCI events and so feed them back into the core.
 603          */
 604         hci_skb_pkt_type(skb) = HCI_EVENT_PKT;
 605         return hci_recv_frame(hdev, skb);
 606 }
 607
 608 /* Recv data */
 609 static const struct h4_recv_pkt nokia_recv_pkts[] = {
 610         { H4_RECV_ACL,          .recv = hci_recv_frame },
 611         { H4_RECV_SCO,          .recv = hci_recv_frame },
 612         { H4_RECV_EVENT,        .recv = hci_recv_frame },
 613         { NOKIA_RECV_ALIVE,     .recv = nokia_recv_alive_packet },
 614         { NOKIA_RECV_NEG,       .recv = nokia_recv_negotiation_packet },
 615         { NOKIA_RECV_RADIO,     .recv = nokia_recv_radio },
 616 };
 617
 618 static int nokia_recv(struct hci_uart *hu, const void *data, int count)
 619 {
 620         struct nokia_bt_dev *btdev = hu->priv;
 621         struct device *dev = &btdev->serdev->dev;
 622         int err;
 623
 624         if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
 625                 return -EUNATCH;
 626
 627         btdev->rx_skb = h4_recv_buf(hu->hdev, btdev->rx_skb, data, count,
 628                                   nokia_recv_pkts, ARRAY_SIZE(nokia_recv_pkts));
 629         if (IS_ERR(btdev->rx_skb)) {
 630                 err = PTR_ERR(btdev->rx_skb);
 631                 dev_err(dev, "Frame reassembly failed (%d)", err);
 632                 btdev->rx_skb = NULL;
 633                 return err;
 634         }
 635
 636         return count;
 637 }
 638
 639 static struct sk_buff *nokia_dequeue(struct hci_uart *hu)
 640 {
 641         struct nokia_bt_dev *btdev = hu->priv;
 642         struct device *dev = &btdev->serdev->dev;
 643         struct sk_buff *result = skb_dequeue(&btdev->txq);
 644
 645         if (!btdev->initialized)
 646                 return result;
 647
 648         if (btdev->tx_enabled == !!result)
 649                 return result;
 650
 651         if (result) {
 652                 pm_runtime_get_sync(dev);
 653                 gpiod_set_value_cansleep(btdev->wakeup_bt, 1);
 654         } else {
 655                 serdev_device_wait_until_sent(btdev->serdev, 0);
 656                 gpiod_set_value_cansleep(btdev->wakeup_bt, 0);
 657                 pm_runtime_put(dev);
 658         }
 659
 660         btdev->tx_enabled = !!result;
 661
 662         return result;
 663 }
 664
 665 static const struct hci_uart_proto nokia_proto = {
 666         .id             = HCI_UART_NOKIA,
 667         .name           = "Nokia",
 668         .open           = nokia_open,
 669         .close          = nokia_close,
 670         .recv           = nokia_recv,
 671         .enqueue        = nokia_enqueue,
 672         .dequeue        = nokia_dequeue,
 673         .flush          = nokia_flush,
 674         .setup          = nokia_setup,
 675         .manufacturer   = 1,
 676 };
 677
 678 static int nokia_bluetooth_serdev_probe(struct serdev_device *serdev)
 679 {
 680         struct device *dev = &serdev->dev;
 681         struct nokia_bt_dev *btdev;
 682         struct clk *sysclk;
 683         int err = 0;
 684
 685         btdev = devm_kzalloc(dev, sizeof(*btdev), GFP_KERNEL);
 686         if (!btdev)
 687                 return -ENOMEM;
 688
 689         btdev->hu.serdev = btdev->serdev = serdev;
 690         serdev_device_set_drvdata(serdev, btdev);
 691
 692         btdev->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
 693         if (IS_ERR(btdev->reset)) {
 694                 err = PTR_ERR(btdev->reset);
 695                 dev_err(dev, "could not get reset gpio: %d", err);
 696                 return err;
 697         }
 698
 699         btdev->wakeup_host = devm_gpiod_get(dev, "host-wakeup", GPIOD_IN);
 700         if (IS_ERR(btdev->wakeup_host)) {
 701                 err = PTR_ERR(btdev->wakeup_host);
 702                 dev_err(dev, "could not get host wakeup gpio: %d", err);
 703                 return err;
 704         }
 705
 706         btdev->wake_irq = gpiod_to_irq(btdev->wakeup_host);
 707
 708         err = devm_request_threaded_irq(dev, btdev->wake_irq, NULL,
 709                 wakeup_handler,
 710                 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
 711                 "wakeup", btdev);
 712         if (err) {
 713                 dev_err(dev, "could request wakeup irq: %d", err);
 714                 return err;
 715         }
 716
 717         btdev->wakeup_bt = devm_gpiod_get(dev, "bluetooth-wakeup",
 718                                            GPIOD_OUT_LOW);
 719         if (IS_ERR(btdev->wakeup_bt)) {
 720                 err = PTR_ERR(btdev->wakeup_bt);
 721                 dev_err(dev, "could not get BT wakeup gpio: %d", err);
 722                 return err;
 723         }
 724
 725         sysclk = devm_clk_get(dev, "sysclk");
 726         if (IS_ERR(sysclk)) {
 727                 err = PTR_ERR(sysclk);
 728                 dev_err(dev, "could not get sysclk: %d", err);
 729                 return err;
 730         }
 731
 732         err = clk_prepare_enable(sysclk);
 733         if (err) {
 734                 dev_err(dev, "could not enable sysclk: %d", err);
 735                 return err;
 736         }
 737         btdev->sysclk_speed = clk_get_rate(sysclk);
 738         clk_disable_unprepare(sysclk);
 739
 740         skb_queue_head_init(&btdev->txq);
 741
 742         btdev->hu.priv = btdev;
 743         btdev->hu.alignment = 2; /* Nokia H4+ is word aligned */
 744
 745         err = hci_uart_register_device(&btdev->hu, &nokia_proto);
 746         if (err) {
 747                 dev_err(dev, "could not register bluetooth uart: %d", err);
 748                 return err;
 749         }
 750
 751         return 0;
 752 }
 753
 754 static void nokia_bluetooth_serdev_remove(struct serdev_device *serdev)
 755 {
 756         struct nokia_bt_dev *btdev = serdev_device_get_drvdata(serdev);
 757
 758         hci_uart_unregister_device(&btdev->hu);
 759 }
 760
 761 static int nokia_bluetooth_runtime_suspend(struct device *dev)
 762 {
 763         struct serdev_device *serdev = to_serdev_device(dev);
 764
 765         nokia_flow_control(serdev, false);
 766         return 0;
 767 }
 768
 769 static int nokia_bluetooth_runtime_resume(struct device *dev)
 770 {
 771         struct serdev_device *serdev = to_serdev_device(dev);
 772
 773         nokia_flow_control(serdev, true);
 774         return 0;
 775 }
 776
 777 static const struct dev_pm_ops nokia_bluetooth_pm_ops = {
 778         SET_RUNTIME_PM_OPS(nokia_bluetooth_runtime_suspend,
 779                            nokia_bluetooth_runtime_resume,
 780                            NULL)
 781 };
 782
 783 #ifdef CONFIG_OF
 784 static const struct of_device_id nokia_bluetooth_of_match[] = {
 785         { .compatible = "nokia,h4p-bluetooth", },
 786         {},
 787 };
 788 MODULE_DEVICE_TABLE(of, nokia_bluetooth_of_match);
 789 #endif
 790
 791 static struct serdev_device_driver nokia_bluetooth_serdev_driver = {
 792         .probe = nokia_bluetooth_serdev_probe,
 793         .remove = nokia_bluetooth_serdev_remove,
 794         .driver = {
 795                 .name = "nokia-bluetooth",
 796                 .pm = &nokia_bluetooth_pm_ops,
 797                 .of_match_table = of_match_ptr(nokia_bluetooth_of_match),
 798         },
 799 };
 800
 801 module_serdev_device_driver(nokia_bluetooth_serdev_driver);
 802
 803 MODULE_AUTHOR("Sebastian Reichel <[email protected]>");
 804 MODULE_DESCRIPTION("Bluetooth HCI UART Nokia H4+ driver ver " VERSION);
 805 MODULE_VERSION(VERSION);
 806 MODULE_LICENSE("GPL");