// SPDX-License-Identifier: GPL-2.0-or-later

  /*
   *
   *  Bluetooth HCI UART driver for Broadcom devices
   *
   *  Copyright (C) 2015  Intel Corporation

   */
  
  #include <linux/kernel.h>
  #include <linux/errno.h>
  #include <linux/skbuff.h>

  #include <linux/firmware.h>

  #include <linux/module.h>
  #include <linux/acpi.h>

  #include <linux/of.h>

  #include <linux/of_irq.h>

  #include <linux/property.h>

  #include <linux/platform_data/x86/apple.h>

  #include <linux/platform_device.h>

  #include <linux/regulator/consumer.h>

  #include <linux/clk.h>
  #include <linux/gpio/consumer.h>
  #include <linux/tty.h>

  #include <linux/interrupt.h>

  #include <linux/dmi.h>

  #include <linux/pm_runtime.h>

  #include <linux/serdev.h>

  
  #include <net/bluetooth/bluetooth.h>
  #include <net/bluetooth/hci_core.h>

  #include "btbcm.h"

  #include "hci_uart.h"

  #define BCM_NULL_PKT 0x00
  #define BCM_NULL_SIZE 0

  #define BCM_LM_DIAG_PKT 0x07
  #define BCM_LM_DIAG_SIZE 63

  #define BCM_TYPE49_PKT 0x31
  #define BCM_TYPE49_SIZE 0
  
  #define BCM_TYPE52_PKT 0x34
  #define BCM_TYPE52_SIZE 0

  #define BCM_AUTOSUSPEND_DELAY	5000 /* default autosleep delay */

  #define BCM_NUM_SUPPLIES 2

  /**

   * struct bcm_device_data - device specific data
   * @no_early_set_baudrate: Disallow set baudrate before driver setup()
   */
  struct bcm_device_data {
  	bool	no_early_set_baudrate;

  	bool	drive_rts_on_open;

  };
  
  /**

   * struct bcm_device - device driver resources
   * @serdev_hu: HCI UART controller struct
   * @list: bcm_device_list node
   * @dev: physical UART slave
   * @name: device name logged by bt_dev_*() functions
   * @device_wakeup: BT_WAKE pin,
   *	assert = Bluetooth device must wake up or remain awake,
   *	deassert = Bluetooth device may sleep when sleep criteria are met
   * @shutdown: BT_REG_ON pin,
   *	power up or power down Bluetooth device internal regulators

   * @set_device_wakeup: callback to toggle BT_WAKE pin

   *	either by accessing @device_wakeup or by calling @btlp

   * @set_shutdown: callback to toggle BT_REG_ON pin

   *	either by accessing @shutdown or by calling @btpu/@btpd
   * @btlp: Apple ACPI method to toggle BT_WAKE pin ("Bluetooth Low Power")
   * @btpu: Apple ACPI method to drive BT_REG_ON pin high ("Bluetooth Power Up")
   * @btpd: Apple ACPI method to drive BT_REG_ON pin low ("Bluetooth Power Down")

   * @txco_clk: external reference frequency clock used by Bluetooth device

   * @lpo_clk: external LPO clock used by Bluetooth device

   * @supplies: VBAT and VDDIO supplies used by Bluetooth device
   * @res_enabled: whether clocks and supplies are prepared and enabled

   * @init_speed: default baudrate of Bluetooth device;
   *	the host UART is initially set to this baudrate so that
   *	it can configure the Bluetooth device for @oper_speed
   * @oper_speed: preferred baudrate of Bluetooth device;
   *	set to 0 if @init_speed is already the preferred baudrate
   * @irq: interrupt triggered by HOST_WAKE_BT pin
   * @irq_active_low: whether @irq is active low
   * @hu: pointer to HCI UART controller struct,
   *	used to disable flow control during runtime suspend and system sleep
   * @is_suspended: whether flow control is currently disabled

   * @no_early_set_baudrate: don't set_baudrate before setup()

   */

  struct bcm_device {

  	/* Must be the first member, hci_serdev.c expects this. */
  	struct hci_uart		serdev_hu;

  	struct list_head	list;

  	struct device		*dev;

  
  	const char		*name;
  	struct gpio_desc	*device_wakeup;
  	struct gpio_desc	*shutdown;

  	int			(*set_device_wakeup)(struct bcm_device *, bool);
  	int			(*set_shutdown)(struct bcm_device *, bool);

  #ifdef CONFIG_ACPI
  	acpi_handle		btlp, btpu, btpd;

  	int			gpio_count;
  	int			gpio_int_idx;

  #endif

  	struct clk		*txco_clk;

  	struct clk		*lpo_clk;

  	struct regulator_bulk_data supplies[BCM_NUM_SUPPLIES];
  	bool			res_enabled;

  
  	u32			init_speed;

  	u32			oper_speed;

  	int			irq;

  	bool			irq_active_low;

  	bool			irq_acquired;

  #ifdef CONFIG_PM

  	struct hci_uart		*hu;

  	bool			is_suspended;

  #endif

  	bool			no_early_set_baudrate;

  	bool			drive_rts_on_open;

  	u8			pcm_int_params[5];

  };

  /* generic bcm uart resources */

  struct bcm_data {

  	struct sk_buff		*rx_skb;
  	struct sk_buff_head	txq;
  
  	struct bcm_device	*dev;

  };

  /* List of BCM BT UART devices */

  static DEFINE_MUTEX(bcm_device_lock);

  static LIST_HEAD(bcm_device_list);

  static int irq_polarity = -1;
  module_param(irq_polarity, int, 0444);
  MODULE_PARM_DESC(irq_polarity, "IRQ polarity 0: active-high 1: active-low");

  static inline void host_set_baudrate(struct hci_uart *hu, unsigned int speed)
  {
  	if (hu->serdev)
  		serdev_device_set_baudrate(hu->serdev, speed);
  	else
  		hci_uart_set_baudrate(hu, speed);
  }

  static int bcm_set_baudrate(struct hci_uart *hu, unsigned int speed)
  {
  	struct hci_dev *hdev = hu->hdev;
  	struct sk_buff *skb;
  	struct bcm_update_uart_baud_rate param;
  
  	if (speed > 3000000) {
  		struct bcm_write_uart_clock_setting clock;
  
  		clock.type = BCM_UART_CLOCK_48MHZ;

  		bt_dev_dbg(hdev, "Set Controller clock (%d)", clock.type);

  
  		/* This Broadcom specific command changes the UART's controller
  		 * clock for baud rate > 3000000.
  		 */
  		skb = __hci_cmd_sync(hdev, 0xfc45, 1, &clock, HCI_INIT_TIMEOUT);
  		if (IS_ERR(skb)) {
  			int err = PTR_ERR(skb);

  			bt_dev_err(hdev, "BCM: failed to write clock (%d)",
  				   err);

  			return err;
  		}
  
  		kfree_skb(skb);
  	}

  	bt_dev_dbg(hdev, "Set Controller UART speed to %d bit/s", speed);

  
  	param.zero = cpu_to_le16(0);
  	param.baud_rate = cpu_to_le32(speed);
  
  	/* This Broadcom specific command changes the UART's controller baud
  	 * rate.
  	 */
  	skb = __hci_cmd_sync(hdev, 0xfc18, sizeof(param), &param,
  			     HCI_INIT_TIMEOUT);
  	if (IS_ERR(skb)) {
  		int err = PTR_ERR(skb);

  		bt_dev_err(hdev, "BCM: failed to write update baudrate (%d)",
  			   err);

  		return err;
  	}
  
  	kfree_skb(skb);
  
  	return 0;
  }

  /* bcm_device_exists should be protected by bcm_device_lock */

  static bool bcm_device_exists(struct bcm_device *device)
  {
  	struct list_head *p;

  #ifdef CONFIG_PM

  	/* Devices using serdev always exist */
  	if (device && device->hu && device->hu->serdev)
  		return true;

  #endif

  	list_for_each(p, &bcm_device_list) {
  		struct bcm_device *dev = list_entry(p, struct bcm_device, list);
  
  		if (device == dev)
  			return true;
  	}
  
  	return false;
  }
  
  static int bcm_gpio_set_power(struct bcm_device *dev, bool powered)
  {

  	int err;

  	if (powered && !dev->res_enabled) {

  		/* Intel Macs use bcm_apple_get_resources() and don't
  		 * have regulator supplies configured.
  		 */
  		if (dev->supplies[0].supply) {
  			err = regulator_bulk_enable(BCM_NUM_SUPPLIES,
  						    dev->supplies);
  			if (err)
  				return err;
  		}

  		/* LPO clock needs to be 32.768 kHz */
  		err = clk_set_rate(dev->lpo_clk, 32768);
  		if (err) {
  			dev_err(dev->dev, "Could not set LPO clock rate
  ");

  			goto err_regulator_disable;

  		}
  
  		err = clk_prepare_enable(dev->lpo_clk);

  		if (err)

  			goto err_regulator_disable;

  
  		err = clk_prepare_enable(dev->txco_clk);
  		if (err)
  			goto err_lpo_clk_disable;

  	}
  
  	err = dev->set_shutdown(dev, powered);
  	if (err)

  		goto err_txco_clk_disable;

  
  	err = dev->set_device_wakeup(dev, powered);
  	if (err)
  		goto err_revert_shutdown;

  	if (!powered && dev->res_enabled) {

  		clk_disable_unprepare(dev->txco_clk);

  		clk_disable_unprepare(dev->lpo_clk);

  
  		/* Intel Macs use bcm_apple_get_resources() and don't
  		 * have regulator supplies configured.
  		 */
  		if (dev->supplies[0].supply)
  			regulator_bulk_disable(BCM_NUM_SUPPLIES,
  					       dev->supplies);

  	}

  	/* wait for device to power on and come out of reset */

  	usleep_range(100000, 120000);

  	dev->res_enabled = powered;

  
  	return 0;

  
  err_revert_shutdown:
  	dev->set_shutdown(dev, !powered);

  err_txco_clk_disable:

  	if (powered && !dev->res_enabled)

  		clk_disable_unprepare(dev->txco_clk);

  err_lpo_clk_disable:

  	if (powered && !dev->res_enabled)

  		clk_disable_unprepare(dev->lpo_clk);

  err_regulator_disable:
  	if (powered && !dev->res_enabled)
  		regulator_bulk_disable(BCM_NUM_SUPPLIES, dev->supplies);

  	return err;

  }

  #ifdef CONFIG_PM

  static irqreturn_t bcm_host_wake(int irq, void *data)
  {
  	struct bcm_device *bdev = data;
  
  	bt_dev_dbg(bdev, "Host wake IRQ");

  	pm_runtime_get(bdev->dev);
  	pm_runtime_mark_last_busy(bdev->dev);
  	pm_runtime_put_autosuspend(bdev->dev);

  	return IRQ_HANDLED;
  }
  
  static int bcm_request_irq(struct bcm_data *bcm)
  {
  	struct bcm_device *bdev = bcm->dev;

  	int err;

  	mutex_lock(&bcm_device_lock);
  	if (!bcm_device_exists(bdev)) {
  		err = -ENODEV;
  		goto unlock;
  	}

  	if (bdev->irq <= 0) {
  		err = -EOPNOTSUPP;
  		goto unlock;
  	}

  	err = devm_request_irq(bdev->dev, bdev->irq, bcm_host_wake,

  			       bdev->irq_active_low ? IRQF_TRIGGER_FALLING :
  						      IRQF_TRIGGER_RISING,
  			       "host_wake", bdev);

  	if (err) {
  		bdev->irq = err;

  		goto unlock;

  	}

  	bdev->irq_acquired = true;

  	device_init_wakeup(bdev->dev, true);

  	pm_runtime_set_autosuspend_delay(bdev->dev,

  					 BCM_AUTOSUSPEND_DELAY);

  	pm_runtime_use_autosuspend(bdev->dev);
  	pm_runtime_set_active(bdev->dev);
  	pm_runtime_enable(bdev->dev);

  
  unlock:
  	mutex_unlock(&bcm_device_lock);
  
  	return err;
  }
  
  static const struct bcm_set_sleep_mode default_sleep_params = {
  	.sleep_mode = 1,	/* 0=Disabled, 1=UART, 2=Reserved, 3=USB */
  	.idle_host = 2,		/* idle threshold HOST, in 300ms */
  	.idle_dev = 2,		/* idle threshold device, in 300ms */
  	.bt_wake_active = 1,	/* BT_WAKE active mode: 1 = high, 0 = low */
  	.host_wake_active = 0,	/* HOST_WAKE active mode: 1 = high, 0 = low */
  	.allow_host_sleep = 1,	/* Allow host sleep in SCO flag */

  	.combine_modes = 1,	/* Combine sleep and LPM flag */

  	.tristate_control = 0,	/* Allow tri-state control of UART tx flag */
  	/* Irrelevant USB flags */
  	.usb_auto_sleep = 0,
  	.usb_resume_timeout = 0,

  	.break_to_host = 0,

  	.pulsed_host_wake = 1,

  };
  
  static int bcm_setup_sleep(struct hci_uart *hu)
  {
  	struct bcm_data *bcm = hu->priv;
  	struct sk_buff *skb;
  	struct bcm_set_sleep_mode sleep_params = default_sleep_params;

  	sleep_params.host_wake_active = !bcm->dev->irq_active_low;

  
  	skb = __hci_cmd_sync(hu->hdev, 0xfc27, sizeof(sleep_params),
  			     &sleep_params, HCI_INIT_TIMEOUT);
  	if (IS_ERR(skb)) {
  		int err = PTR_ERR(skb);
  		bt_dev_err(hu->hdev, "Sleep VSC failed (%d)", err);
  		return err;
  	}
  	kfree_skb(skb);
  
  	bt_dev_dbg(hu->hdev, "Set Sleep Parameters VSC succeeded");
  
  	return 0;
  }
  #else
  static inline int bcm_request_irq(struct bcm_data *bcm) { return 0; }
  static inline int bcm_setup_sleep(struct hci_uart *hu) { return 0; }
  #endif

  static int bcm_set_diag(struct hci_dev *hdev, bool enable)
  {
  	struct hci_uart *hu = hci_get_drvdata(hdev);
  	struct bcm_data *bcm = hu->priv;
  	struct sk_buff *skb;
  
  	if (!test_bit(HCI_RUNNING, &hdev->flags))
  		return -ENETDOWN;
  
  	skb = bt_skb_alloc(3, GFP_KERNEL);

  	if (!skb)
  		return -ENOMEM;

  	skb_put_u8(skb, BCM_LM_DIAG_PKT);
  	skb_put_u8(skb, 0xf0);
  	skb_put_u8(skb, enable);

  
  	skb_queue_tail(&bcm->txq, skb);
  	hci_uart_tx_wakeup(hu);
  
  	return 0;
  }

  static int bcm_open(struct hci_uart *hu)
  {
  	struct bcm_data *bcm;

  	struct list_head *p;

  	int err;

  	bt_dev_dbg(hu->hdev, "hu %p", hu);

  	if (!hci_uart_has_flow_control(hu))
  		return -EOPNOTSUPP;

  	bcm = kzalloc(sizeof(*bcm), GFP_KERNEL);
  	if (!bcm)
  		return -ENOMEM;
  
  	skb_queue_head_init(&bcm->txq);
  
  	hu->priv = bcm;

  	mutex_lock(&bcm_device_lock);

  	if (hu->serdev) {

  		bcm->dev = serdev_device_get_drvdata(hu->serdev);

  		goto out;
  	}

  	if (!hu->tty->dev)
  		goto out;

  	list_for_each(p, &bcm_device_list) {
  		struct bcm_device *dev = list_entry(p, struct bcm_device, list);
  
  		/* Retrieve saved bcm_device based on parent of the
  		 * platform device (saved during device probe) and
  		 * parent of tty device used by hci_uart
  		 */

  		if (hu->tty->dev->parent == dev->dev->parent) {

  			bcm->dev = dev;

  #ifdef CONFIG_PM

  			dev->hu = hu;
  #endif

  			break;
  		}
  	}

  out:

  	if (bcm->dev) {

  		if (bcm->dev->drive_rts_on_open)
  			hci_uart_set_flow_control(hu, true);

  		hu->init_speed = bcm->dev->init_speed;

  
  		/* If oper_speed is set, ldisc/serdev will set the baudrate
  		 * before calling setup()
  		 */
  		if (!bcm->dev->no_early_set_baudrate)
  			hu->oper_speed = bcm->dev->oper_speed;

  		err = bcm_gpio_set_power(bcm->dev, true);

  
  		if (bcm->dev->drive_rts_on_open)
  			hci_uart_set_flow_control(hu, false);

  		if (err)
  			goto err_unset_hu;

  	}
  
  	mutex_unlock(&bcm_device_lock);

  	return 0;

  
  err_unset_hu:
  #ifdef CONFIG_PM

  	if (!hu->serdev)

  		bcm->dev->hu = NULL;

  #endif

  	mutex_unlock(&bcm_device_lock);
  	hu->priv = NULL;
  	kfree(bcm);
  	return err;

  }
  
  static int bcm_close(struct hci_uart *hu)
  {
  	struct bcm_data *bcm = hu->priv;

  	struct bcm_device *bdev = NULL;

  	int err;

  	bt_dev_dbg(hu->hdev, "hu %p", hu);

  	/* Protect bcm->dev against removal of the device or driver */

  	mutex_lock(&bcm_device_lock);

  
  	if (hu->serdev) {

  		bdev = serdev_device_get_drvdata(hu->serdev);
  	} else if (bcm_device_exists(bcm->dev)) {
  		bdev = bcm->dev;
  #ifdef CONFIG_PM
  		bdev->hu = NULL;
  #endif
  	}
  
  	if (bdev) {

  		if (IS_ENABLED(CONFIG_PM) && bdev->irq_acquired) {

  			devm_free_irq(bdev->dev, bdev->irq, bdev);
  			device_init_wakeup(bdev->dev, false);

  			pm_runtime_disable(bdev->dev);

  		}

  		err = bcm_gpio_set_power(bdev, false);
  		if (err)
  			bt_dev_err(hu->hdev, "Failed to power down");
  		else
  			pm_runtime_set_suspended(bdev->dev);

  	}

  	mutex_unlock(&bcm_device_lock);

  	skb_queue_purge(&bcm->txq);
  	kfree_skb(bcm->rx_skb);
  	kfree(bcm);
  
  	hu->priv = NULL;
  	return 0;
  }
  
  static int bcm_flush(struct hci_uart *hu)
  {
  	struct bcm_data *bcm = hu->priv;

  	bt_dev_dbg(hu->hdev, "hu %p", hu);

  
  	skb_queue_purge(&bcm->txq);
  
  	return 0;
  }
  
  static int bcm_setup(struct hci_uart *hu)
  {

  	struct bcm_data *bcm = hu->priv;

  	bool fw_load_done = false;

  	unsigned int speed;

  	int err;

  	bt_dev_dbg(hu->hdev, "hu %p", hu);

  	hu->hdev->set_diag = bcm_set_diag;

  	hu->hdev->set_bdaddr = btbcm_set_bdaddr;

  	err = btbcm_initialize(hu->hdev, &fw_load_done);

  	if (err)
  		return err;

  	if (!fw_load_done)

  		return 0;

  	/* Init speed if any */
  	if (hu->init_speed)
  		speed = hu->init_speed;
  	else if (hu->proto->init_speed)
  		speed = hu->proto->init_speed;
  	else
  		speed = 0;
  
  	if (speed)

  		host_set_baudrate(hu, speed);

  
  	/* Operational speed if any */
  	if (hu->oper_speed)
  		speed = hu->oper_speed;

  	else if (bcm->dev && bcm->dev->oper_speed)
  		speed = bcm->dev->oper_speed;

  	else if (hu->proto->oper_speed)
  		speed = hu->proto->oper_speed;
  	else
  		speed = 0;
  
  	if (speed) {
  		err = bcm_set_baudrate(hu, speed);

  		if (!err)

  			host_set_baudrate(hu, speed);

  	}

  	/* PCM parameters if provided */
  	if (bcm->dev && bcm->dev->pcm_int_params[0] != 0xff) {
  		struct bcm_set_pcm_int_params params;
  
  		btbcm_read_pcm_int_params(hu->hdev, &params);
  
  		memcpy(&params, bcm->dev->pcm_int_params, 5);
  		btbcm_write_pcm_int_params(hu->hdev, &params);
  	}

  	err = btbcm_finalize(hu->hdev, &fw_load_done);

  	if (err)
  		return err;

  	/* Some devices ship with the controller default address.
  	 * Allow the bootloader to set a valid address through the
  	 * device tree.
  	 */
  	set_bit(HCI_QUIRK_USE_BDADDR_PROPERTY, &hu->hdev->quirks);

  	if (!bcm_request_irq(bcm))

  		err = bcm_setup_sleep(hu);

  
  	return err;

  }

  #define BCM_RECV_LM_DIAG \
  	.type = BCM_LM_DIAG_PKT, \
  	.hlen = BCM_LM_DIAG_SIZE, \
  	.loff = 0, \
  	.lsize = 0, \
  	.maxlen = BCM_LM_DIAG_SIZE

  #define BCM_RECV_NULL \
  	.type = BCM_NULL_PKT, \
  	.hlen = BCM_NULL_SIZE, \
  	.loff = 0, \
  	.lsize = 0, \
  	.maxlen = BCM_NULL_SIZE

  #define BCM_RECV_TYPE49 \
  	.type = BCM_TYPE49_PKT, \
  	.hlen = BCM_TYPE49_SIZE, \
  	.loff = 0, \
  	.lsize = 0, \
  	.maxlen = BCM_TYPE49_SIZE
  
  #define BCM_RECV_TYPE52 \
  	.type = BCM_TYPE52_PKT, \
  	.hlen = BCM_TYPE52_SIZE, \
  	.loff = 0, \
  	.lsize = 0, \
  	.maxlen = BCM_TYPE52_SIZE

  static const struct h4_recv_pkt bcm_recv_pkts[] = {

  	{ H4_RECV_ACL,      .recv = hci_recv_frame },
  	{ H4_RECV_SCO,      .recv = hci_recv_frame },
  	{ H4_RECV_EVENT,    .recv = hci_recv_frame },
  	{ BCM_RECV_LM_DIAG, .recv = hci_recv_diag  },

  	{ BCM_RECV_NULL,    .recv = hci_recv_diag  },

  	{ BCM_RECV_TYPE49,  .recv = hci_recv_diag  },
  	{ BCM_RECV_TYPE52,  .recv = hci_recv_diag  },

  };

  static int bcm_recv(struct hci_uart *hu, const void *data, int count)
  {
  	struct bcm_data *bcm = hu->priv;
  
  	if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
  		return -EUNATCH;

  	bcm->rx_skb = h4_recv_buf(hu->hdev, bcm->rx_skb, data, count,
  				  bcm_recv_pkts, ARRAY_SIZE(bcm_recv_pkts));

  	if (IS_ERR(bcm->rx_skb)) {
  		int err = PTR_ERR(bcm->rx_skb);

  		bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err);

  		bcm->rx_skb = NULL;

  		return err;

  	} else if (!bcm->rx_skb) {
  		/* Delay auto-suspend when receiving completed packet */
  		mutex_lock(&bcm_device_lock);

  		if (bcm->dev && bcm_device_exists(bcm->dev)) {
  			pm_runtime_get(bcm->dev->dev);
  			pm_runtime_mark_last_busy(bcm->dev->dev);
  			pm_runtime_put_autosuspend(bcm->dev->dev);
  		}

  		mutex_unlock(&bcm_device_lock);

  	}
  
  	return count;
  }
  
  static int bcm_enqueue(struct hci_uart *hu, struct sk_buff *skb)
  {
  	struct bcm_data *bcm = hu->priv;

  	bt_dev_dbg(hu->hdev, "hu %p skb %p", hu, skb);

  
  	/* Prepend skb with frame type */

  	memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);

  	skb_queue_tail(&bcm->txq, skb);
  
  	return 0;
  }
  
  static struct sk_buff *bcm_dequeue(struct hci_uart *hu)
  {
  	struct bcm_data *bcm = hu->priv;

  	struct sk_buff *skb = NULL;
  	struct bcm_device *bdev = NULL;
  
  	mutex_lock(&bcm_device_lock);
  
  	if (bcm_device_exists(bcm->dev)) {
  		bdev = bcm->dev;

  		pm_runtime_get_sync(bdev->dev);

  		/* Shall be resumed here */
  	}
  
  	skb = skb_dequeue(&bcm->txq);
  
  	if (bdev) {

  		pm_runtime_mark_last_busy(bdev->dev);
  		pm_runtime_put_autosuspend(bdev->dev);

  	}

  	mutex_unlock(&bcm_device_lock);
  
  	return skb;

  }

  #ifdef CONFIG_PM
  static int bcm_suspend_device(struct device *dev)

  {

  	struct bcm_device *bdev = dev_get_drvdata(dev);

  	int err;

  	bt_dev_dbg(bdev, "");

  	if (!bdev->is_suspended && bdev->hu) {

  		hci_uart_set_flow_control(bdev->hu, true);

  		/* Once this returns, driver suspends BT via GPIO */

  		bdev->is_suspended = true;
  	}
  
  	/* Suspend the device */

  	err = bdev->set_device_wakeup(bdev, false);
  	if (err) {
  		if (bdev->is_suspended && bdev->hu) {
  			bdev->is_suspended = false;
  			hci_uart_set_flow_control(bdev->hu, false);
  		}
  		return -EBUSY;
  	}

  	bt_dev_dbg(bdev, "suspend, delaying 15 ms");

  	msleep(15);

  	return 0;
  }
  
  static int bcm_resume_device(struct device *dev)
  {

  	struct bcm_device *bdev = dev_get_drvdata(dev);

  	int err;

  
  	bt_dev_dbg(bdev, "");

  	err = bdev->set_device_wakeup(bdev, true);
  	if (err) {
  		dev_err(dev, "Failed to power up
  ");
  		return err;
  	}

  	bt_dev_dbg(bdev, "resume, delaying 15 ms");

  	msleep(15);

  
  	/* When this executes, the device has woken up already */
  	if (bdev->is_suspended && bdev->hu) {
  		bdev->is_suspended = false;
  
  		hci_uart_set_flow_control(bdev->hu, false);
  	}
  
  	return 0;
  }
  #endif
  
  #ifdef CONFIG_PM_SLEEP

  /* suspend callback */

  static int bcm_suspend(struct device *dev)
  {

  	struct bcm_device *bdev = dev_get_drvdata(dev);

  	int error;
  
  	bt_dev_dbg(bdev, "suspend: is_suspended %d", bdev->is_suspended);

  	/*
  	 * When used with a device instantiated as platform_device, bcm_suspend
  	 * can be called at any time as long as the platform device is bound,
  	 * so it should use bcm_device_lock to protect access to hci_uart

  	 * and device_wake-up GPIO.
  	 */
  	mutex_lock(&bcm_device_lock);
  
  	if (!bdev->hu)
  		goto unlock;

  	if (pm_runtime_active(dev))
  		bcm_suspend_device(dev);

  	if (device_may_wakeup(dev) && bdev->irq > 0) {

  		error = enable_irq_wake(bdev->irq);
  		if (!error)
  			bt_dev_dbg(bdev, "BCM irq: enabled");
  	}

  unlock:

  	mutex_unlock(&bcm_device_lock);

  	return 0;
  }

  /* resume callback */

  static int bcm_resume(struct device *dev)
  {

  	struct bcm_device *bdev = dev_get_drvdata(dev);

  	int err = 0;

  	bt_dev_dbg(bdev, "resume: is_suspended %d", bdev->is_suspended);

  	/*
  	 * When used with a device instantiated as platform_device, bcm_resume
  	 * can be called at any time as long as platform device is bound,
  	 * so it should use bcm_device_lock to protect access to hci_uart

  	 * and device_wake-up GPIO.
  	 */

  	mutex_lock(&bcm_device_lock);

  
  	if (!bdev->hu)
  		goto unlock;

  	if (device_may_wakeup(dev) && bdev->irq > 0) {

  		disable_irq_wake(bdev->irq);
  		bt_dev_dbg(bdev, "BCM irq: disabled");
  	}

  	err = bcm_resume_device(dev);

  unlock:

  	mutex_unlock(&bcm_device_lock);

  	if (!err) {
  		pm_runtime_disable(dev);
  		pm_runtime_set_active(dev);
  		pm_runtime_enable(dev);
  	}

  	return 0;
  }
  #endif

  /* Some firmware reports an IRQ which does not work (wrong pin in fw table?) */
  static const struct dmi_system_id bcm_broken_irq_dmi_table[] = {
  	{
  		.ident = "Meegopad T08",
  		.matches = {
  			DMI_EXACT_MATCH(DMI_BOARD_VENDOR,
  					"To be filled by OEM."),
  			DMI_EXACT_MATCH(DMI_BOARD_NAME, "T3 MRD"),
  			DMI_EXACT_MATCH(DMI_BOARD_VERSION, "V1.1"),
  		},
  	},
  	{ }
  };
  
  #ifdef CONFIG_ACPI

  static const struct acpi_gpio_params first_gpio = { 0, 0, false };
  static const struct acpi_gpio_params second_gpio = { 1, 0, false };
  static const struct acpi_gpio_params third_gpio = { 2, 0, false };

  
  static const struct acpi_gpio_mapping acpi_bcm_int_last_gpios[] = {

  	{ "device-wakeup-gpios", &first_gpio, 1 },
  	{ "shutdown-gpios", &second_gpio, 1 },
  	{ "host-wakeup-gpios", &third_gpio, 1 },

  	{ },
  };

  static const struct acpi_gpio_mapping acpi_bcm_int_first_gpios[] = {

  	{ "host-wakeup-gpios", &first_gpio, 1 },
  	{ "device-wakeup-gpios", &second_gpio, 1 },
  	{ "shutdown-gpios", &third_gpio, 1 },

  	{ },
  };

  static int bcm_resource(struct acpi_resource *ares, void *data)
  {
  	struct bcm_device *dev = data;

  	struct acpi_resource_extended_irq *irq;
  	struct acpi_resource_gpio *gpio;
  	struct acpi_resource_uart_serialbus *sb;
  
  	switch (ares->type) {
  	case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
  		irq = &ares->data.extended_irq;

  		if (irq->polarity != ACPI_ACTIVE_LOW)
  			dev_info(dev->dev, "ACPI Interrupt resource is active-high, this is usually wrong, treating the IRQ as active-low
  ");
  		dev->irq_active_low = true;

  		break;
  
  	case ACPI_RESOURCE_TYPE_GPIO:
  		gpio = &ares->data.gpio;

  		if (gpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT) {
  			dev->gpio_int_idx = dev->gpio_count;

  			dev->irq_active_low = gpio->polarity == ACPI_ACTIVE_LOW;

  		}
  		dev->gpio_count++;

  		break;
  
  	case ACPI_RESOURCE_TYPE_SERIAL_BUS:

  		sb = &ares->data.uart_serial_bus;

  		if (sb->type == ACPI_RESOURCE_SERIAL_TYPE_UART) {

  			dev->init_speed = sb->default_baud_rate;

  			dev->oper_speed = 4000000;
  		}

  		break;
  
  	default:
  		break;

  	}

  	return 0;

  }

  
  static int bcm_apple_set_device_wakeup(struct bcm_device *dev, bool awake)
  {
  	if (ACPI_FAILURE(acpi_execute_simple_method(dev->btlp, NULL, !awake)))
  		return -EIO;
  
  	return 0;
  }
  
  static int bcm_apple_set_shutdown(struct bcm_device *dev, bool powered)
  {
  	if (ACPI_FAILURE(acpi_evaluate_object(powered ? dev->btpu : dev->btpd,
  					      NULL, NULL, NULL)))
  		return -EIO;
  
  	return 0;
  }
  
  static int bcm_apple_get_resources(struct bcm_device *dev)
  {
  	struct acpi_device *adev = ACPI_COMPANION(dev->dev);
  	const union acpi_object *obj;
  
  	if (!adev ||
  	    ACPI_FAILURE(acpi_get_handle(adev->handle, "BTLP", &dev->btlp)) ||
  	    ACPI_FAILURE(acpi_get_handle(adev->handle, "BTPU", &dev->btpu)) ||
  	    ACPI_FAILURE(acpi_get_handle(adev->handle, "BTPD", &dev->btpd)))
  		return -ENODEV;
  
  	if (!acpi_dev_get_property(adev, "baud", ACPI_TYPE_BUFFER, &obj) &&
  	    obj->buffer.length == 8)
  		dev->init_speed = *(u64 *)obj->buffer.pointer;
  
  	dev->set_device_wakeup = bcm_apple_set_device_wakeup;
  	dev->set_shutdown = bcm_apple_set_shutdown;
  
  	return 0;
  }
  #else
  static inline int bcm_apple_get_resources(struct bcm_device *dev)
  {
  	return -EOPNOTSUPP;
  }

  #endif /* CONFIG_ACPI */

  static int bcm_gpio_set_device_wakeup(struct bcm_device *dev, bool awake)
  {

  	gpiod_set_value_cansleep(dev->device_wakeup, awake);

  	return 0;
  }
  
  static int bcm_gpio_set_shutdown(struct bcm_device *dev, bool powered)
  {

  	gpiod_set_value_cansleep(dev->shutdown, powered);

  	return 0;
  }

  /* Try a bunch of names for TXCO */
  static struct clk *bcm_get_txco(struct device *dev)
  {
  	struct clk *clk;
  
  	/* New explicit name */
  	clk = devm_clk_get(dev, "txco");
  	if (!IS_ERR(clk) || PTR_ERR(clk) == -EPROBE_DEFER)
  		return clk;
  
  	/* Deprecated name */
  	clk = devm_clk_get(dev, "extclk");
  	if (!IS_ERR(clk) || PTR_ERR(clk) == -EPROBE_DEFER)
  		return clk;
  
  	/* Original code used no name at all */
  	return devm_clk_get(dev, NULL);
  }

  static int bcm_get_resources(struct bcm_device *dev)

  {

  	const struct dmi_system_id *dmi_id;

  	int err;

  	dev->name = dev_name(dev->dev);

  	if (x86_apple_machine && !bcm_apple_get_resources(dev))
  		return 0;

  	dev->txco_clk = bcm_get_txco(dev->dev);

  	/* Handle deferred probing */

  	if (dev->txco_clk == ERR_PTR(-EPROBE_DEFER))
  		return PTR_ERR(dev->txco_clk);

  	/* Ignore all other errors as before */

  	if (IS_ERR(dev->txco_clk))
  		dev->txco_clk = NULL;

  	dev->lpo_clk = devm_clk_get(dev->dev, "lpo");
  	if (dev->lpo_clk == ERR_PTR(-EPROBE_DEFER))
  		return PTR_ERR(dev->lpo_clk);
  
  	if (IS_ERR(dev->lpo_clk))
  		dev->lpo_clk = NULL;
  
  	/* Check if we accidentally fetched the lpo clock twice */
  	if (dev->lpo_clk && clk_is_match(dev->lpo_clk, dev->txco_clk)) {
  		devm_clk_put(dev->dev, dev->txco_clk);
  		dev->txco_clk = NULL;
  	}

  	dev->device_wakeup = devm_gpiod_get_optional(dev->dev, "device-wakeup",
  						     GPIOD_OUT_LOW);

  	if (IS_ERR(dev->device_wakeup))
  		return PTR_ERR(dev->device_wakeup);

  	dev->shutdown = devm_gpiod_get_optional(dev->dev, "shutdown",
  						GPIOD_OUT_LOW);

  	if (IS_ERR(dev->shutdown))
  		return PTR_ERR(dev->shutdown);

  	dev->set_device_wakeup = bcm_gpio_set_device_wakeup;
  	dev->set_shutdown = bcm_gpio_set_shutdown;

  	dev->supplies[0].supply = "vbat";
  	dev->supplies[1].supply = "vddio";
  	err = devm_regulator_bulk_get(dev->dev, BCM_NUM_SUPPLIES,
  				      dev->supplies);
  	if (err)
  		return err;

  	/* IRQ can be declared in ACPI table as Interrupt or GpioInt */

  	if (dev->irq <= 0) {
  		struct gpio_desc *gpio;

  		gpio = devm_gpiod_get_optional(dev->dev, "host-wakeup",

  					       GPIOD_IN);
  		if (IS_ERR(gpio))
  			return PTR_ERR(gpio);
  
  		dev->irq = gpiod_to_irq(gpio);
  	}

  	dmi_id = dmi_first_match(bcm_broken_irq_dmi_table);
  	if (dmi_id) {
  		dev_info(dev->dev, "%s: Has a broken IRQ config, disabling IRQ support / runtime-pm
  ",
  			 dmi_id->ident);
  		dev->irq = 0;
  	}

  	dev_dbg(dev->dev, "BCM irq: %d
  ", dev->irq);

  	return 0;
  }
  
  #ifdef CONFIG_ACPI
  static int bcm_acpi_probe(struct bcm_device *dev)
  {

  	LIST_HEAD(resources);

  	const struct acpi_gpio_mapping *gpio_mapping = acpi_bcm_int_last_gpios;

  	struct resource_entry *entry;

  	int ret;

  	/* Retrieve UART ACPI info */

  	dev->gpio_int_idx = -1;

  	ret = acpi_dev_get_resources(ACPI_COMPANION(dev->dev),

  				     &resources, bcm_resource, dev);

  	if (ret < 0)
  		return ret;

  
  	resource_list_for_each_entry(entry, &resources) {
  		if (resource_type(entry->res) == IORESOURCE_IRQ) {
  			dev->irq = entry->res->start;
  			break;
  		}
  	}

  	acpi_dev_free_resource_list(&resources);

  	/* If the DSDT uses an Interrupt resource for the IRQ, then there are
  	 * only 2 GPIO resources, we use the irq-last mapping for this, since
  	 * we already have an irq the 3th / last mapping will not be used.
  	 */
  	if (dev->irq)
  		gpio_mapping = acpi_bcm_int_last_gpios;
  	else if (dev->gpio_int_idx == 0)
  		gpio_mapping = acpi_bcm_int_first_gpios;
  	else if (dev->gpio_int_idx == 2)
  		gpio_mapping = acpi_bcm_int_last_gpios;
  	else
  		dev_warn(dev->dev, "Unexpected ACPI gpio_int_idx: %d
  ",
  			 dev->gpio_int_idx);
  
  	/* Warn if our expectations are not met. */
  	if (dev->gpio_count != (dev->irq ? 2 : 3))
  		dev_warn(dev->dev, "Unexpected number of ACPI GPIOs: %d
  ",
  			 dev->gpio_count);
  
  	ret = devm_acpi_dev_add_driver_gpios(dev->dev, gpio_mapping);
  	if (ret)
  		return ret;

  	if (irq_polarity != -1) {
  		dev->irq_active_low = irq_polarity;
  		dev_warn(dev->dev, "Overwriting IRQ polarity to active %s by module-param
  ",
  			 dev->irq_active_low ? "low" : "high");

  	}

  	return 0;
  }

  #else
  static int bcm_acpi_probe(struct bcm_device *dev)
  {
  	return -EINVAL;
  }
  #endif /* CONFIG_ACPI */

  static int bcm_of_probe(struct bcm_device *bdev)
  {
  	device_property_read_u32(bdev->dev, "max-speed", &bdev->oper_speed);

  	device_property_read_u8_array(bdev->dev, "brcm,bt-pcm-int-params",
  				      bdev->pcm_int_params, 5);

  	bdev->irq = of_irq_get_byname(bdev->dev->of_node, "host-wakeup");

  	bdev->irq_active_low = irq_get_trigger_type(bdev->irq)
  			     & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_LEVEL_LOW);

  	return 0;
  }

  static int bcm_probe(struct platform_device *pdev)
  {
  	struct bcm_device *dev;

  	int ret;
  
  	dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
  	if (!dev)
  		return -ENOMEM;

  	dev->dev = &pdev->dev;

  	dev->irq = platform_get_irq(pdev, 0);

  	/* Initialize routing field to an unused value */
  	dev->pcm_int_params[0] = 0xff;

  	if (has_acpi_companion(&pdev->dev)) {

  		ret = bcm_acpi_probe(dev);

  		if (ret)
  			return ret;
  	}

  	ret = bcm_get_resources(dev);

  	if (ret)
  		return ret;

  
  	platform_set_drvdata(pdev, dev);
  
  	dev_info(&pdev->dev, "%s device registered.
  ", dev->name);
  
  	/* Place this instance on the device list */

  	mutex_lock(&bcm_device_lock);

  	list_add_tail(&dev->list, &bcm_device_list);

  	mutex_unlock(&bcm_device_lock);

  	ret = bcm_gpio_set_power(dev, false);
  	if (ret)
  		dev_err(&pdev->dev, "Failed to power down
  ");

  
  	return 0;
  }
  
  static int bcm_remove(struct platform_device *pdev)
  {
  	struct bcm_device *dev = platform_get_drvdata(pdev);

  	mutex_lock(&bcm_device_lock);

  	list_del(&dev->list);

  	mutex_unlock(&bcm_device_lock);

  	dev_info(&pdev->dev, "%s device unregistered.
  ", dev->name);
  
  	return 0;
  }

  static const struct hci_uart_proto bcm_proto = {
  	.id		= HCI_UART_BCM,

  	.name		= "Broadcom",

  	.manufacturer	= 15,

  	.init_speed	= 115200,

  	.open		= bcm_open,
  	.close		= bcm_close,
  	.flush		= bcm_flush,
  	.setup		= bcm_setup,

  	.set_baudrate	= bcm_set_baudrate,

  	.recv		= bcm_recv,
  	.enqueue	= bcm_enqueue,
  	.dequeue	= bcm_dequeue,
  };

  #ifdef CONFIG_ACPI
  static const struct acpi_device_id bcm_acpi_match[] = {

  	{ "BCM2E00" },
  	{ "BCM2E01" },
  	{ "BCM2E02" },
  	{ "BCM2E03" },
  	{ "BCM2E04" },
  	{ "BCM2E05" },
  	{ "BCM2E06" },
  	{ "BCM2E07" },
  	{ "BCM2E08" },
  	{ "BCM2E09" },
  	{ "BCM2E0A" },
  	{ "BCM2E0B" },
  	{ "BCM2E0C" },
  	{ "BCM2E0D" },
  	{ "BCM2E0E" },
  	{ "BCM2E0F" },
  	{ "BCM2E10" },
  	{ "BCM2E11" },
  	{ "BCM2E12" },
  	{ "BCM2E13" },
  	{ "BCM2E14" },
  	{ "BCM2E15" },
  	{ "BCM2E16" },
  	{ "BCM2E17" },
  	{ "BCM2E18" },
  	{ "BCM2E19" },

  	{ "BCM2E1A" },

  	{ "BCM2E1B" },
  	{ "BCM2E1C" },
  	{ "BCM2E1D" },
  	{ "BCM2E1F" },
  	{ "BCM2E20" },
  	{ "BCM2E21" },
  	{ "BCM2E22" },
  	{ "BCM2E23" },
  	{ "BCM2E24" },
  	{ "BCM2E25" },
  	{ "BCM2E26" },
  	{ "BCM2E27" },
  	{ "BCM2E28" },
  	{ "BCM2E29" },
  	{ "BCM2E2A" },
  	{ "BCM2E2B" },
  	{ "BCM2E2C" },
  	{ "BCM2E2D" },
  	{ "BCM2E2E" },
  	{ "BCM2E2F" },
  	{ "BCM2E30" },
  	{ "BCM2E31" },
  	{ "BCM2E32" },
  	{ "BCM2E33" },
  	{ "BCM2E34" },
  	{ "BCM2E35" },
  	{ "BCM2E36" },
  	{ "BCM2E37" },

  	{ "BCM2E38" },
  	{ "BCM2E39" },
  	{ "BCM2E3A" },

  	{ "BCM2E3B" },
  	{ "BCM2E3C" },

  	{ "BCM2E3D" },

  	{ "BCM2E3E" },

  	{ "BCM2E3F" },
  	{ "BCM2E40" },

  	{ "BCM2E41" },
  	{ "BCM2E42" },
  	{ "BCM2E43" },
  	{ "BCM2E44" },
  	{ "BCM2E45" },
  	{ "BCM2E46" },
  	{ "BCM2E47" },
  	{ "BCM2E48" },
  	{ "BCM2E49" },
  	{ "BCM2E4A" },
  	{ "BCM2E4B" },
  	{ "BCM2E4C" },
  	{ "BCM2E4D" },
  	{ "BCM2E4E" },
  	{ "BCM2E4F" },
  	{ "BCM2E50" },
  	{ "BCM2E51" },
  	{ "BCM2E52" },
  	{ "BCM2E53" },

  	{ "BCM2E54" },
  	{ "BCM2E55" },

  	{ "BCM2E56" },
  	{ "BCM2E57" },
  	{ "BCM2E58" },
  	{ "BCM2E59" },
  	{ "BCM2E5A" },
  	{ "BCM2E5B" },
  	{ "BCM2E5C" },
  	{ "BCM2E5D" },
  	{ "BCM2E5E" },
  	{ "BCM2E5F" },
  	{ "BCM2E60" },
  	{ "BCM2E61" },
  	{ "BCM2E62" },
  	{ "BCM2E63" },

  	{ "BCM2E64" },
  	{ "BCM2E65" },

  	{ "BCM2E66" },

  	{ "BCM2E67" },

  	{ "BCM2E68" },
  	{ "BCM2E69" },
  	{ "BCM2E6B" },
  	{ "BCM2E6D" },
  	{ "BCM2E6E" },
  	{ "BCM2E6F" },
  	{ "BCM2E70" },

  	{ "BCM2E71" },
  	{ "BCM2E72" },

  	{ "BCM2E73" },

  	{ "BCM2E74" },

  	{ "BCM2E75" },
  	{ "BCM2E76" },
  	{ "BCM2E77" },
  	{ "BCM2E78" },
  	{ "BCM2E79" },
  	{ "BCM2E7A" },

  	{ "BCM2E7B" },
  	{ "BCM2E7C" },

  	{ "BCM2E7D" },

  	{ "BCM2E7E" },

  	{ "BCM2E7F" },
  	{ "BCM2E80" },
  	{ "BCM2E81" },
  	{ "BCM2E82" },

  	{ "BCM2E83" },
  	{ "BCM2E84" },

  	{ "BCM2E85" },
  	{ "BCM2E86" },
  	{ "BCM2E87" },
  	{ "BCM2E88" },
  	{ "BCM2E89" },
  	{ "BCM2E8A" },
  	{ "BCM2E8B" },
  	{ "BCM2E8C" },
  	{ "BCM2E8D" },
  	{ "BCM2E8E" },

  	{ "BCM2E90" },

  	{ "BCM2E92" },
  	{ "BCM2E93" },
  	{ "BCM2E94" },

  	{ "BCM2E95" },
  	{ "BCM2E96" },

  	{ "BCM2E97" },
  	{ "BCM2E98" },
  	{ "BCM2E99" },
  	{ "BCM2E9A" },
  	{ "BCM2E9B" },
  	{ "BCM2E9C" },
  	{ "BCM2E9D" },
  	{ "BCM2EA0" },
  	{ "BCM2EA1" },
  	{ "BCM2EA2" },
  	{ "BCM2EA3" },

  	{ "BCM2EA4" },

  	{ "BCM2EA5" },
  	{ "BCM2EA6" },
  	{ "BCM2EA7" },
  	{ "BCM2EA8" },
  	{ "BCM2EA9" },

  	{ "BCM2EAA" },

  	{ "BCM2EAB" },
  	{ "BCM2EAC" },

  	{ },
  };
  MODULE_DEVICE_TABLE(acpi, bcm_acpi_match);
  #endif

  /* suspend and resume callbacks */

  static const struct dev_pm_ops bcm_pm_ops = {
  	SET_SYSTEM_SLEEP_PM_OPS(bcm_suspend, bcm_resume)
  	SET_RUNTIME_PM_OPS(bcm_suspend_device, bcm_resume_device, NULL)
  };

  static struct platform_driver bcm_driver = {
  	.probe = bcm_probe,
  	.remove = bcm_remove,
  	.driver = {
  		.name = "hci_bcm",
  		.acpi_match_table = ACPI_PTR(bcm_acpi_match),

  		.pm = &bcm_pm_ops,

  	},
  };

  static int bcm_serdev_probe(struct serdev_device *serdev)
  {

  	struct bcm_device *bcmdev;

  	const struct bcm_device_data *data;

  	int err;
  
  	bcmdev = devm_kzalloc(&serdev->dev, sizeof(*bcmdev), GFP_KERNEL);
  	if (!bcmdev)
  		return -ENOMEM;

  	bcmdev->dev = &serdev->dev;

  #ifdef CONFIG_PM

  	bcmdev->hu = &bcmdev->serdev_hu;

  #endif

  	bcmdev->serdev_hu.serdev = serdev;

  	serdev_device_set_drvdata(serdev, bcmdev);

  	/* Initialize routing field to an unused value */
  	bcmdev->pcm_int_params[0] = 0xff;

  	if (has_acpi_companion(&serdev->dev))
  		err = bcm_acpi_probe(bcmdev);
  	else
  		err = bcm_of_probe(bcmdev);
  	if (err)
  		return err;

  	err = bcm_get_resources(bcmdev);
  	if (err)
  		return err;

  	if (!bcmdev->shutdown) {
  		dev_warn(&serdev->dev,
  			 "No reset resource, using default baud rate
  ");
  		bcmdev->oper_speed = bcmdev->init_speed;
  	}

  	err = bcm_gpio_set_power(bcmdev, false);
  	if (err)
  		dev_err(&serdev->dev, "Failed to power down
  ");

  	data = device_get_match_data(bcmdev->dev);

  	if (data) {

  		bcmdev->no_early_set_baudrate = data->no_early_set_baudrate;

  		bcmdev->drive_rts_on_open = data->drive_rts_on_open;
  	}

  	return hci_uart_register_device(&bcmdev->serdev_hu, &bcm_proto);

  }
  
  static void bcm_serdev_remove(struct serdev_device *serdev)
  {

  	struct bcm_device *bcmdev = serdev_device_get_drvdata(serdev);

  	hci_uart_unregister_device(&bcmdev->serdev_hu);

  }
  
  #ifdef CONFIG_OF

  static struct bcm_device_data bcm4354_device_data = {
  	.no_early_set_baudrate = true,
  };

  static struct bcm_device_data bcm43438_device_data = {
  	.drive_rts_on_open = true,
  };

  static const struct of_device_id bcm_bluetooth_of_match[] = {

  	{ .compatible = "brcm,bcm20702a1" },

  	{ .compatible = "brcm,bcm4329-bt" },

  	{ .compatible = "brcm,bcm4345c5" },

  	{ .compatible = "brcm,bcm4330-bt" },

  	{ .compatible = "brcm,bcm43438-bt", .data = &bcm43438_device_data },

  	{ .compatible = "brcm,bcm43540-bt", .data = &bcm4354_device_data },

  	{ .compatible = "brcm,bcm4335a0" },

  	{ },
  };
  MODULE_DEVICE_TABLE(of, bcm_bluetooth_of_match);
  #endif
  
  static struct serdev_device_driver bcm_serdev_driver = {
  	.probe = bcm_serdev_probe,
  	.remove = bcm_serdev_remove,
  	.driver = {
  		.name = "hci_uart_bcm",
  		.of_match_table = of_match_ptr(bcm_bluetooth_of_match),

  		.acpi_match_table = ACPI_PTR(bcm_acpi_match),
  		.pm = &bcm_pm_ops,

  	},
  };

  int __init bcm_init(void)
  {

  	/* For now, we need to keep both platform device
  	 * driver (ACPI generated) and serdev driver (DT).
  	 */

  	platform_driver_register(&bcm_driver);

  	serdev_device_driver_register(&bcm_serdev_driver);

  	return hci_uart_register_proto(&bcm_proto);
  }
  
  int __exit bcm_deinit(void)
  {

  	platform_driver_unregister(&bcm_driver);

  	serdev_device_driver_unregister(&bcm_serdev_driver);

  	return hci_uart_unregister_proto(&bcm_proto);
  }