/* Bluetooth HCI driver model support. */
  
  #include <linux/module.h>
  
  #include <net/bluetooth/bluetooth.h>
  #include <net/bluetooth/hci_core.h>
  
  static struct class *bt_class;
  
  static inline char *link_typetostr(int type)
  {
  	switch (type) {
  	case ACL_LINK:
  		return "ACL";
  	case SCO_LINK:
  		return "SCO";
  	case ESCO_LINK:
  		return "eSCO";
  	case LE_LINK:
  		return "LE";
  	default:
  		return "UNKNOWN";
  	}
  }
  
  static ssize_t show_link_type(struct device *dev,
  			      struct device_attribute *attr, char *buf)
  {
  	struct hci_conn *conn = to_hci_conn(dev);
  	return sprintf(buf, "%s
  ", link_typetostr(conn->type));
  }
  
  static ssize_t show_link_address(struct device *dev,
  				 struct device_attribute *attr, char *buf)
  {
  	struct hci_conn *conn = to_hci_conn(dev);
  	return sprintf(buf, "%pMR
  ", &conn->dst);
  }
  
  #define LINK_ATTR(_name, _mode, _show, _store) \
  struct device_attribute link_attr_##_name = __ATTR(_name, _mode, _show, _store)
  
  static LINK_ATTR(type, S_IRUGO, show_link_type, NULL);
  static LINK_ATTR(address, S_IRUGO, show_link_address, NULL);
  
  static struct attribute *bt_link_attrs[] = {
  	&link_attr_type.attr,
  	&link_attr_address.attr,
  	NULL
  };
  
  static struct attribute_group bt_link_group = {
  	.attrs = bt_link_attrs,
  };
  
  static const struct attribute_group *bt_link_groups[] = {
  	&bt_link_group,
  	NULL
  };
  
  static void bt_link_release(struct device *dev)
  {
  	struct hci_conn *conn = to_hci_conn(dev);
  	kfree(conn);
  }
  
  static struct device_type bt_link = {
  	.name    = "link",
  	.groups  = bt_link_groups,
  	.release = bt_link_release,
  };
  
  /*
   * The rfcomm tty device will possibly retain even when conn
   * is down, and sysfs doesn't support move zombie device,
   * so we should move the device before conn device is destroyed.
   */
  static int __match_tty(struct device *dev, void *data)
  {
  	return !strncmp(dev_name(dev), "rfcomm", 6);
  }
  
  void hci_conn_init_sysfs(struct hci_conn *conn)
  {
  	struct hci_dev *hdev = conn->hdev;
  
  	BT_DBG("conn %p", conn);
  
  	conn->dev.type = &bt_link;
  	conn->dev.class = bt_class;
  	conn->dev.parent = &hdev->dev;
  
  	device_initialize(&conn->dev);
  }
  
  void hci_conn_add_sysfs(struct hci_conn *conn)
  {
  	struct hci_dev *hdev = conn->hdev;
  
  	BT_DBG("conn %p", conn);
  
  	dev_set_name(&conn->dev, "%s:%d", hdev->name, conn->handle);
  
  	if (device_add(&conn->dev) < 0) {
  		BT_ERR("Failed to register connection device");
  		return;
  	}
  
  	hci_dev_hold(hdev);
  }
  
  void hci_conn_del_sysfs(struct hci_conn *conn)
  {
  	struct hci_dev *hdev = conn->hdev;
  
  	if (!device_is_registered(&conn->dev))
  		return;
  
  	while (1) {
  		struct device *dev;
  
  		dev = device_find_child(&conn->dev, NULL, __match_tty);
  		if (!dev)
  			break;
  		device_move(dev, NULL, DPM_ORDER_DEV_LAST);
  		put_device(dev);
  	}
  
  	device_del(&conn->dev);
  
  	hci_dev_put(hdev);
  }
  
  static inline char *host_typetostr(int type)
  {
  	switch (type) {
  	case HCI_BREDR:
  		return "BR/EDR";
  	case HCI_AMP:
  		return "AMP";
  	default:
  		return "UNKNOWN";
  	}
  }
  
  static ssize_t show_type(struct device *dev,
  			 struct device_attribute *attr, char *buf)
  {
  	struct hci_dev *hdev = to_hci_dev(dev);
  	return sprintf(buf, "%s
  ", host_typetostr(hdev->dev_type));
  }
  
  static ssize_t show_name(struct device *dev,
  			 struct device_attribute *attr, char *buf)
  {
  	struct hci_dev *hdev = to_hci_dev(dev);
  	char name[HCI_MAX_NAME_LENGTH + 1];
  	int i;
  
  	for (i = 0; i < HCI_MAX_NAME_LENGTH; i++)
  		name[i] = hdev->dev_name[i];
  
  	name[HCI_MAX_NAME_LENGTH] = '\0';
  	return sprintf(buf, "%s
  ", name);
  }
  
  static ssize_t show_address(struct device *dev,
  			    struct device_attribute *attr, char *buf)
  {
  	struct hci_dev *hdev = to_hci_dev(dev);
  	return sprintf(buf, "%pMR
  ", &hdev->bdaddr);
  }
  
  static DEVICE_ATTR(type, S_IRUGO, show_type, NULL);
  static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
  static DEVICE_ATTR(address, S_IRUGO, show_address, NULL);
  
  static struct attribute *bt_host_attrs[] = {
  	&dev_attr_type.attr,
  	&dev_attr_name.attr,
  	&dev_attr_address.attr,
  	NULL
  };
  
  static struct attribute_group bt_host_group = {
  	.attrs = bt_host_attrs,
  };
  
  static const struct attribute_group *bt_host_groups[] = {
  	&bt_host_group,
  	NULL
  };
  
  static void bt_host_release(struct device *dev)
  {
  	struct hci_dev *hdev = to_hci_dev(dev);
  	kfree(hdev);
  	module_put(THIS_MODULE);
  }
  
  static struct device_type bt_host = {
  	.name    = "host",
  	.groups  = bt_host_groups,
  	.release = bt_host_release,
  };
  
  void hci_init_sysfs(struct hci_dev *hdev)
  {
  	struct device *dev = &hdev->dev;
  
  	dev->type = &bt_host;
  	dev->class = bt_class;
  
  	__module_get(THIS_MODULE);
  	device_initialize(dev);
  }
  
  int __init bt_sysfs_init(void)
  {
  	bt_class = class_create(THIS_MODULE, "bluetooth");
  
  	return PTR_ERR_OR_ZERO(bt_class);
  }
  
  void bt_sysfs_cleanup(void)
  {
  	class_destroy(bt_class);
  }