drivers/bluetooth/hci_bcm.c - arm/linux - Git at Google

 /*
  *
  *  Bluetooth HCI UART driver for Broadcom devices
  *
  *  Copyright (C) 2015  Intel Corporation
  *
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
  *  the Free Software Foundation; either version 2 of the License, or
  *  (at your option) any later version.
  *
  *  This program is distributed in the hope that it will be useful,
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  *  GNU General Public License for more details.
  *
  *  You should have received a copy of the GNU General Public License
  *  along with this program; if not, write to the Free Software
  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  *
  */

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

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

 #include "btbcm.h"
 #include "hci_uart.h"

 struct bcm_device {
 	struct list_head	list;

 	struct platform_device	*pdev;

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

 	struct clk		*clk;
 	bool			clk_enabled;

 	u32			init_speed;

 #ifdef CONFIG_PM_SLEEP
 	struct hci_uart		*hu;
 	bool			is_suspended; /* suspend/resume flag */
 #endif
 };

 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_SPINLOCK(bcm_device_lock);
 static LIST_HEAD(bcm_device_list);

 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_DBG("%s: Set Controller clock (%d)", hdev->name, 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_ERR("%s: BCM: failed to write clock command (%d)",
 			       hdev->name, err);
 			return err;
 		}

 		kfree_skb(skb);
 	}

 	BT_DBG("%s: Set Controller UART speed to %d bit/s", hdev->name, 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_ERR("%s: BCM: failed to write update baudrate command (%d)",
 		       hdev->name, 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;

 	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)
 {
 	if (powered && !IS_ERR(dev->clk) && !dev->clk_enabled)
 		clk_enable(dev->clk);

 	gpiod_set_value(dev->shutdown, powered);
 	gpiod_set_value(dev->device_wakeup, powered);

 	if (!powered && !IS_ERR(dev->clk) && dev->clk_enabled)
 		clk_disable(dev->clk);

 	dev->clk_enabled = powered;

 	return 0;
 }

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

 	BT_DBG("hu %p", hu);

 	bcm = kzalloc(sizeof(*bcm), GFP_KERNEL);
 	if (!bcm)
 		return -ENOMEM;

 	skb_queue_head_init(&bcm->txq);

 	hu->priv = bcm;

 	spin_lock(&bcm_device_lock);
 	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->pdev->dev.parent) {
 			bcm->dev = dev;
 			hu->init_speed = dev->init_speed;
 #ifdef CONFIG_PM_SLEEP
 			dev->hu = hu;
 #endif
 			break;
 		}
 	}

 	if (bcm->dev)
 		bcm_gpio_set_power(bcm->dev, true);

 	spin_unlock(&bcm_device_lock);

 	return 0;
 }

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

 	BT_DBG("hu %p", hu);

 	/* Protect bcm->dev against removal of the device or driver */
 	spin_lock(&bcm_device_lock);
 	if (bcm_device_exists(bcm->dev)) {
 		bcm_gpio_set_power(bcm->dev, false);
 #ifdef CONFIG_PM_SLEEP
 		bcm->dev->hu = NULL;
 #endif
 	}
 	spin_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_DBG("hu %p", hu);

 	skb_queue_purge(&bcm->txq);

 	return 0;
 }

 static int bcm_setup(struct hci_uart *hu)
 {
 	char fw_name[64];
 	const struct firmware *fw;
 	unsigned int speed;
 	int err;

 	BT_DBG("hu %p", hu);

 	hu->hdev->set_bdaddr = btbcm_set_bdaddr;

 	err = btbcm_initialize(hu->hdev, fw_name, sizeof(fw_name));
 	if (err)
 		return err;

 	err = request_firmware(&fw, fw_name, &hu->hdev->dev);
 	if (err < 0) {
 		BT_INFO("%s: BCM: Patch %s not found", hu->hdev->name, fw_name);
 		return 0;
 	}

 	err = btbcm_patchram(hu->hdev, fw);
 	if (err) {
 		BT_INFO("%s: BCM: Patch failed (%d)", hu->hdev->name, err);
 		goto finalize;
 	}

 	/* 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)
 		hci_uart_set_baudrate(hu, speed);

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

 finalize:
 	release_firmware(fw);

 	err = btbcm_finalize(hu->hdev);

 	return err;
 }

 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 },
 };

 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_ERR("%s: Frame reassembly failed (%d)", hu->hdev->name, err);
 		bcm->rx_skb = NULL;
 		return err;
 	}

 	return count;
 }

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

 	BT_DBG("hu %p skb %p", hu, skb);

 	/* Prepend skb with frame type */
 	memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 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;

 	return skb_dequeue(&bcm->txq);
 }

 #ifdef CONFIG_PM_SLEEP
 /* Platform suspend callback */
 static int bcm_suspend(struct device *dev)
 {
 	struct bcm_device *bdev = platform_get_drvdata(to_platform_device(dev));

 	BT_DBG("suspend (%p): is_suspended %d", bdev, bdev->is_suspended);

 	spin_lock(&bcm_device_lock);

 	if (!bdev->hu)
 		goto unlock;

 	if (!bdev->is_suspended) {
 		hci_uart_set_flow_control(bdev->hu, true);

 		/* Once this callback returns, driver suspends BT via GPIO */
 		bdev->is_suspended = true;
 	}

 	/* Suspend the device */
 	if (bdev->device_wakeup) {
 		gpiod_set_value(bdev->device_wakeup, false);
 		BT_DBG("suspend, delaying 15 ms");
 		mdelay(15);
 	}

 unlock:
 	spin_unlock(&bcm_device_lock);

 	return 0;
 }

 /* Platform resume callback */
 static int bcm_resume(struct device *dev)
 {
 	struct bcm_device *bdev = platform_get_drvdata(to_platform_device(dev));

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

 	spin_lock(&bcm_device_lock);

 	if (!bdev->hu)
 		goto unlock;

 	if (bdev->device_wakeup) {
 		gpiod_set_value(bdev->device_wakeup, true);
 		BT_DBG("resume, delaying 15 ms");
 		mdelay(15);
 	}

 	/* When this callback executes, the device has woken up already */
 	if (bdev->is_suspended) {
 		bdev->is_suspended = false;

 		hci_uart_set_flow_control(bdev->hu, false);
 	}

 unlock:
 	spin_unlock(&bcm_device_lock);

 	return 0;
 }
 #endif

 static const struct acpi_gpio_params device_wakeup_gpios = { 0, 0, false };
 static const struct acpi_gpio_params shutdown_gpios = { 1, 0, false };

 static const struct acpi_gpio_mapping acpi_bcm_default_gpios[] = {
 	{ "device-wakeup-gpios", &device_wakeup_gpios, 1 },
 	{ "shutdown-gpios", &shutdown_gpios, 1 },
 	{ },
 };

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

 	if (ares->type == ACPI_RESOURCE_TYPE_SERIAL_BUS) {
 		struct acpi_resource_uart_serialbus *sb;

 		sb = &ares->data.uart_serial_bus;
 		if (sb->type == ACPI_RESOURCE_SERIAL_TYPE_UART)
 			dev->init_speed = sb->default_baud_rate;
 	}

 	/* Always tell the ACPI core to skip this resource */
 	return 1;
 }

 static int bcm_acpi_probe(struct bcm_device *dev)
 {
 	struct platform_device *pdev = dev->pdev;
 	const struct acpi_device_id *id;
 	struct acpi_device *adev;
 	LIST_HEAD(resources);
 	int ret;

 	id = acpi_match_device(pdev->dev.driver->acpi_match_table, &pdev->dev);
 	if (!id)
 		return -ENODEV;

 	/* Retrieve GPIO data */
 	dev->name = dev_name(&pdev->dev);
 	ret = acpi_dev_add_driver_gpios(ACPI_COMPANION(&pdev->dev),
 					acpi_bcm_default_gpios);
 	if (ret)
 		return ret;

 	dev->clk = devm_clk_get(&pdev->dev, NULL);

 	dev->device_wakeup = devm_gpiod_get_optional(&pdev->dev,
 						     "device-wakeup",
 						     GPIOD_OUT_LOW);
 	if (IS_ERR(dev->device_wakeup))
 		return PTR_ERR(dev->device_wakeup);

 	dev->shutdown = devm_gpiod_get_optional(&pdev->dev, "shutdown",
 						GPIOD_OUT_LOW);
 	if (IS_ERR(dev->shutdown))
 		return PTR_ERR(dev->shutdown);

 	/* Make sure at-least one of the GPIO is defined and that
 	 * a name is specified for this instance
 	 */
 	if ((!dev->device_wakeup && !dev->shutdown) || !dev->name) {
 		dev_err(&pdev->dev, "invalid platform data\n");
 		return -EINVAL;
 	}

 	/* Retrieve UART ACPI info */
 	adev = ACPI_COMPANION(&dev->pdev->dev);
 	if (!adev)
 		return 0;

 	acpi_dev_get_resources(adev, &resources, bcm_resource, dev);

 	return 0;
 }
 #else
 static int bcm_acpi_probe(struct bcm_device *dev)
 {
 	return -EINVAL;
 }
 #endif /* CONFIG_ACPI */

 static int bcm_probe(struct platform_device *pdev)
 {
 	struct bcm_device *dev;
 	struct acpi_device_id *pdata = pdev->dev.platform_data;
 	int ret;

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

 	dev->pdev = pdev;

 	if (ACPI_HANDLE(&pdev->dev)) {
 		ret = bcm_acpi_probe(dev);
 		if (ret)
 			return ret;
 	} else if (pdata) {
 		dev->name = pdata->id;
 	} else {
 		return -ENODEV;
 	}

 	platform_set_drvdata(pdev, dev);

 	dev_info(&pdev->dev, "%s device registered.\n", dev->name);

 	/* Place this instance on the device list */
 	spin_lock(&bcm_device_lock);
 	list_add_tail(&dev->list, &bcm_device_list);
 	spin_unlock(&bcm_device_lock);

 	bcm_gpio_set_power(dev, false);

 	return 0;
 }

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

 	spin_lock(&bcm_device_lock);
 	list_del(&dev->list);
 	spin_unlock(&bcm_device_lock);

 	acpi_dev_remove_driver_gpios(ACPI_COMPANION(&pdev->dev));

 	dev_info(&pdev->dev, "%s device unregistered.\n", dev->name);

 	return 0;
 }

 static const struct hci_uart_proto bcm_proto = {
 	.id		= HCI_UART_BCM,
 	.name		= "BCM",
 	.init_speed	= 115200,
 	.oper_speed	= 4000000,
 	.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[] = {
 	{ "BCM2E39", 0 },
 	{ "BCM2E67", 0 },
 	{ },
 };
 MODULE_DEVICE_TABLE(acpi, bcm_acpi_match);
 #endif

 /* Platform suspend and resume callbacks */
 static SIMPLE_DEV_PM_OPS(bcm_pm_ops, bcm_suspend, bcm_resume);

 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,
 	},
 };

 int __init bcm_init(void)
 {
 	platform_driver_register(&bcm_driver);

 	return hci_uart_register_proto(&bcm_proto);
 }

 int __exit bcm_deinit(void)
 {
 	platform_driver_unregister(&bcm_driver);

 	return hci_uart_unregister_proto(&bcm_proto);
 }
	/*
	*
	* Bluetooth HCI UART driver for Broadcom devices
	*
	* Copyright (C) 2015 Intel Corporation
	*
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	*
	*/

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

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

	#include "btbcm.h"
	#include "hci_uart.h"

	struct bcm_device {
	struct list_head list;

	struct platform_device *pdev;

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

	struct clk *clk;
	bool clk_enabled;

	u32 init_speed;

	#ifdef CONFIG_PM_SLEEP
	struct hci_uart *hu;
	bool is_suspended; /* suspend/resume flag */
	#endif
	};

	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_SPINLOCK(bcm_device_lock);
	static LIST_HEAD(bcm_device_list);

	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_DBG("%s: Set Controller clock (%d)", hdev->name, 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_ERR("%s: BCM: failed to write clock command (%d)",
	hdev->name, err);
	return err;
	}

	kfree_skb(skb);
	}

	BT_DBG("%s: Set Controller UART speed to %d bit/s", hdev->name, 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_ERR("%s: BCM: failed to write update baudrate command (%d)",
	hdev->name, 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;

	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)
	{
	if (powered && !IS_ERR(dev->clk) && !dev->clk_enabled)
	clk_enable(dev->clk);

	gpiod_set_value(dev->shutdown, powered);
	gpiod_set_value(dev->device_wakeup, powered);

	if (!powered && !IS_ERR(dev->clk) && dev->clk_enabled)
	clk_disable(dev->clk);

	dev->clk_enabled = powered;

	return 0;
	}

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

	BT_DBG("hu %p", hu);

	bcm = kzalloc(sizeof(*bcm), GFP_KERNEL);
	if (!bcm)
	return -ENOMEM;

	skb_queue_head_init(&bcm->txq);

	hu->priv = bcm;

	spin_lock(&bcm_device_lock);
	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->pdev->dev.parent) {
	bcm->dev = dev;
	hu->init_speed = dev->init_speed;
	#ifdef CONFIG_PM_SLEEP
	dev->hu = hu;
	#endif
	break;
	}
	}

	if (bcm->dev)
	bcm_gpio_set_power(bcm->dev, true);

	spin_unlock(&bcm_device_lock);

	return 0;
	}

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

	BT_DBG("hu %p", hu);

	/* Protect bcm->dev against removal of the device or driver */
	spin_lock(&bcm_device_lock);
	if (bcm_device_exists(bcm->dev)) {
	bcm_gpio_set_power(bcm->dev, false);
	#ifdef CONFIG_PM_SLEEP
	bcm->dev->hu = NULL;
	#endif
	}
	spin_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_DBG("hu %p", hu);

	skb_queue_purge(&bcm->txq);

	return 0;
	}

	static int bcm_setup(struct hci_uart *hu)
	{
	char fw_name[64];
	const struct firmware *fw;
	unsigned int speed;
	int err;

	BT_DBG("hu %p", hu);

	hu->hdev->set_bdaddr = btbcm_set_bdaddr;

	err = btbcm_initialize(hu->hdev, fw_name, sizeof(fw_name));
	if (err)
	return err;

	err = request_firmware(&fw, fw_name, &hu->hdev->dev);
	if (err < 0) {
	BT_INFO("%s: BCM: Patch %s not found", hu->hdev->name, fw_name);
	return 0;
	}

	err = btbcm_patchram(hu->hdev, fw);
	if (err) {
	BT_INFO("%s: BCM: Patch failed (%d)", hu->hdev->name, err);
	goto finalize;
	}

	/* 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)
	hci_uart_set_baudrate(hu, speed);

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

	finalize:
	release_firmware(fw);

	err = btbcm_finalize(hu->hdev);

	return err;
	}

	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 },
	};

	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_ERR("%s: Frame reassembly failed (%d)", hu->hdev->name, err);
	bcm->rx_skb = NULL;
	return err;
	}

	return count;
	}

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

	BT_DBG("hu %p skb %p", hu, skb);

	/* Prepend skb with frame type */
	memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 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;

	return skb_dequeue(&bcm->txq);
	}

	#ifdef CONFIG_PM_SLEEP
	/* Platform suspend callback */
	static int bcm_suspend(struct device *dev)
	{
	struct bcm_device *bdev = platform_get_drvdata(to_platform_device(dev));

	BT_DBG("suspend (%p): is_suspended %d", bdev, bdev->is_suspended);

	spin_lock(&bcm_device_lock);

	if (!bdev->hu)
	goto unlock;

	if (!bdev->is_suspended) {
	hci_uart_set_flow_control(bdev->hu, true);

	/* Once this callback returns, driver suspends BT via GPIO */
	bdev->is_suspended = true;
	}

	/* Suspend the device */
	if (bdev->device_wakeup) {
	gpiod_set_value(bdev->device_wakeup, false);
	BT_DBG("suspend, delaying 15 ms");
	mdelay(15);
	}

	unlock:
	spin_unlock(&bcm_device_lock);

	return 0;
	}

	/* Platform resume callback */
	static int bcm_resume(struct device *dev)
	{
	struct bcm_device *bdev = platform_get_drvdata(to_platform_device(dev));

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

	spin_lock(&bcm_device_lock);

	if (!bdev->hu)
	goto unlock;

	if (bdev->device_wakeup) {
	gpiod_set_value(bdev->device_wakeup, true);
	BT_DBG("resume, delaying 15 ms");
	mdelay(15);
	}

	/* When this callback executes, the device has woken up already */
	if (bdev->is_suspended) {
	bdev->is_suspended = false;

	hci_uart_set_flow_control(bdev->hu, false);
	}

	unlock:
	spin_unlock(&bcm_device_lock);

	return 0;
	}
	#endif

	static const struct acpi_gpio_params device_wakeup_gpios = { 0, 0, false };
	static const struct acpi_gpio_params shutdown_gpios = { 1, 0, false };

	static const struct acpi_gpio_mapping acpi_bcm_default_gpios[] = {
	{ "device-wakeup-gpios", &device_wakeup_gpios, 1 },
	{ "shutdown-gpios", &shutdown_gpios, 1 },
	{ },
	};

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

	if (ares->type == ACPI_RESOURCE_TYPE_SERIAL_BUS) {
	struct acpi_resource_uart_serialbus *sb;

	sb = &ares->data.uart_serial_bus;
	if (sb->type == ACPI_RESOURCE_SERIAL_TYPE_UART)
	dev->init_speed = sb->default_baud_rate;
	}

	/* Always tell the ACPI core to skip this resource */
	return 1;
	}

	static int bcm_acpi_probe(struct bcm_device *dev)
	{
	struct platform_device *pdev = dev->pdev;
	const struct acpi_device_id *id;
	struct acpi_device *adev;
	LIST_HEAD(resources);
	int ret;

	id = acpi_match_device(pdev->dev.driver->acpi_match_table, &pdev->dev);
	if (!id)
	return -ENODEV;

	/* Retrieve GPIO data */
	dev->name = dev_name(&pdev->dev);
	ret = acpi_dev_add_driver_gpios(ACPI_COMPANION(&pdev->dev),
	acpi_bcm_default_gpios);
	if (ret)
	return ret;

	dev->clk = devm_clk_get(&pdev->dev, NULL);

	dev->device_wakeup = devm_gpiod_get_optional(&pdev->dev,
	"device-wakeup",
	GPIOD_OUT_LOW);
	if (IS_ERR(dev->device_wakeup))
	return PTR_ERR(dev->device_wakeup);

	dev->shutdown = devm_gpiod_get_optional(&pdev->dev, "shutdown",
	GPIOD_OUT_LOW);
	if (IS_ERR(dev->shutdown))
	return PTR_ERR(dev->shutdown);

	/* Make sure at-least one of the GPIO is defined and that
	* a name is specified for this instance
	*/
	if ((!dev->device_wakeup && !dev->shutdown) \|\| !dev->name) {
	dev_err(&pdev->dev, "invalid platform data\n");
	return -EINVAL;
	}

	/* Retrieve UART ACPI info */
	adev = ACPI_COMPANION(&dev->pdev->dev);
	if (!adev)
	return 0;

	acpi_dev_get_resources(adev, &resources, bcm_resource, dev);

	return 0;
	}
	#else
	static int bcm_acpi_probe(struct bcm_device *dev)
	{
	return -EINVAL;
	}
	#endif /* CONFIG_ACPI */

	static int bcm_probe(struct platform_device *pdev)
	{
	struct bcm_device *dev;
	struct acpi_device_id *pdata = pdev->dev.platform_data;
	int ret;

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

	dev->pdev = pdev;

	if (ACPI_HANDLE(&pdev->dev)) {
	ret = bcm_acpi_probe(dev);
	if (ret)
	return ret;
	} else if (pdata) {
	dev->name = pdata->id;
	} else {
	return -ENODEV;
	}

	platform_set_drvdata(pdev, dev);

	dev_info(&pdev->dev, "%s device registered.\n", dev->name);

	/* Place this instance on the device list */
	spin_lock(&bcm_device_lock);
	list_add_tail(&dev->list, &bcm_device_list);
	spin_unlock(&bcm_device_lock);

	bcm_gpio_set_power(dev, false);

	return 0;
	}

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

	spin_lock(&bcm_device_lock);
	list_del(&dev->list);
	spin_unlock(&bcm_device_lock);

	acpi_dev_remove_driver_gpios(ACPI_COMPANION(&pdev->dev));

	dev_info(&pdev->dev, "%s device unregistered.\n", dev->name);

	return 0;
	}

	static const struct hci_uart_proto bcm_proto = {
	.id = HCI_UART_BCM,
	.name = "BCM",
	.init_speed = 115200,
	.oper_speed = 4000000,
	.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[] = {
	{ "BCM2E39", 0 },
	{ "BCM2E67", 0 },
	{ },
	};
	MODULE_DEVICE_TABLE(acpi, bcm_acpi_match);
	#endif

	/* Platform suspend and resume callbacks */
	static SIMPLE_DEV_PM_OPS(bcm_pm_ops, bcm_suspend, bcm_resume);

	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,
	},
	};

	int __init bcm_init(void)
	{
	platform_driver_register(&bcm_driver);

	return hci_uart_register_proto(&bcm_proto);
	}

	int __exit bcm_deinit(void)
	{
	platform_driver_unregister(&bcm_driver);

	return hci_uart_unregister_proto(&bcm_proto);
	}