net/bluetooth/hci_sysfs.c - kernel/msm-4.9 - Gitiles

 /* Bluetooth HCI driver model support. */

 #include <linux/kernel.h>
 #include <linux/init.h>

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

 struct class *bt_class = NULL;
 EXPORT_SYMBOL_GPL(bt_class);

 static struct workqueue_struct *bt_workq;

 static inline char *link_typetostr(int type)
 {
 	switch (type) {
 	case ACL_LINK:
 		return "ACL";
 	case SCO_LINK:
 		return "SCO";
 	case ESCO_LINK:
 		return "eSCO";
 	default:
 		return "UNKNOWN";
 	}
 }

 static ssize_t show_link_type(struct device *dev, struct device_attribute *attr, char *buf)
 {
 	struct hci_conn *conn = dev_get_drvdata(dev);
 	return sprintf(buf, "%s\n", link_typetostr(conn->type));
 }

 static ssize_t show_link_address(struct device *dev, struct device_attribute *attr, char *buf)
 {
 	struct hci_conn *conn = dev_get_drvdata(dev);
 	bdaddr_t bdaddr;
 	baswap(&bdaddr, &conn->dst);
 	return sprintf(buf, "%s\n", batostr(&bdaddr));
 }

 static ssize_t show_link_features(struct device *dev, struct device_attribute *attr, char *buf)
 {
 	struct hci_conn *conn = dev_get_drvdata(dev);

 	return sprintf(buf, "0x%02x%02x%02x%02x%02x%02x%02x%02x\n",
 				conn->features[0], conn->features[1],
 				conn->features[2], conn->features[3],
 				conn->features[4], conn->features[5],
 				conn->features[6], conn->features[7]);
 }

 #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 LINK_ATTR(features, S_IRUGO, show_link_features, NULL);

 static struct attribute *bt_link_attrs[] = {
 	&link_attr_type.attr,
 	&link_attr_address.attr,
 	&link_attr_features.attr,
 	NULL
 };

 static struct attribute_group bt_link_group = {
 	.attrs = bt_link_attrs,
 };

 static struct attribute_group *bt_link_groups[] = {
 	&bt_link_group,
 	NULL
 };

 static void bt_link_release(struct device *dev)
 {
 	void *data = dev_get_drvdata(dev);
 	kfree(data);
 }

 static struct device_type bt_link = {
 	.name    = "link",
 	.groups  = bt_link_groups,
 	.release = bt_link_release,
 };

 static void add_conn(struct work_struct *work)
 {
 	struct hci_conn *conn = container_of(work, struct hci_conn, work_add);
 	struct hci_dev *hdev = conn->hdev;

 	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);
 }

 /*
  * 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);
 }

 static void del_conn(struct work_struct *work)
 {
 	struct hci_conn *conn = container_of(work, struct hci_conn, work_del);
 	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);
 	put_device(&conn->dev);

 	hci_dev_put(hdev);
 }

 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;

 	dev_set_drvdata(&conn->dev, conn);

 	device_initialize(&conn->dev);

 	INIT_WORK(&conn->work_add, add_conn);
 	INIT_WORK(&conn->work_del, del_conn);
 }

 void hci_conn_add_sysfs(struct hci_conn *conn)
 {
 	BT_DBG("conn %p", conn);

 	queue_work(bt_workq, &conn->work_add);
 }

 void hci_conn_del_sysfs(struct hci_conn *conn)
 {
 	BT_DBG("conn %p", conn);

 	queue_work(bt_workq, &conn->work_del);
 }

 static inline char *host_typetostr(int type)
 {
 	switch (type) {
 	case HCI_VIRTUAL:
 		return "VIRTUAL";
 	case HCI_USB:
 		return "USB";
 	case HCI_PCCARD:
 		return "PCCARD";
 	case HCI_UART:
 		return "UART";
 	case HCI_RS232:
 		return "RS232";
 	case HCI_PCI:
 		return "PCI";
 	case HCI_SDIO:
 		return "SDIO";
 	default:
 		return "UNKNOWN";
 	}
 }

 static ssize_t show_type(struct device *dev, struct device_attribute *attr, char *buf)
 {
 	struct hci_dev *hdev = dev_get_drvdata(dev);
 	return sprintf(buf, "%s\n", host_typetostr(hdev->type));
 }

 static ssize_t show_name(struct device *dev, struct device_attribute *attr, char *buf)
 {
 	struct hci_dev *hdev = dev_get_drvdata(dev);
 	char name[249];
 	int i;

 	for (i = 0; i < 248; i++)
 		name[i] = hdev->dev_name[i];

 	name[248] = '\0';
 	return sprintf(buf, "%s\n", name);
 }

 static ssize_t show_class(struct device *dev, struct device_attribute *attr, char *buf)
 {
 	struct hci_dev *hdev = dev_get_drvdata(dev);
 	return sprintf(buf, "0x%.2x%.2x%.2x\n",
 			hdev->dev_class[2], hdev->dev_class[1], hdev->dev_class[0]);
 }

 static ssize_t show_address(struct device *dev, struct device_attribute *attr, char *buf)
 {
 	struct hci_dev *hdev = dev_get_drvdata(dev);
 	bdaddr_t bdaddr;
 	baswap(&bdaddr, &hdev->bdaddr);
 	return sprintf(buf, "%s\n", batostr(&bdaddr));
 }

 static ssize_t show_features(struct device *dev, struct device_attribute *attr, char *buf)
 {
 	struct hci_dev *hdev = dev_get_drvdata(dev);

 	return sprintf(buf, "0x%02x%02x%02x%02x%02x%02x%02x%02x\n",
 				hdev->features[0], hdev->features[1],
 				hdev->features[2], hdev->features[3],
 				hdev->features[4], hdev->features[5],
 				hdev->features[6], hdev->features[7]);
 }

 static ssize_t show_manufacturer(struct device *dev, struct device_attribute *attr, char *buf)
 {
 	struct hci_dev *hdev = dev_get_drvdata(dev);
 	return sprintf(buf, "%d\n", hdev->manufacturer);
 }

 static ssize_t show_hci_version(struct device *dev, struct device_attribute *attr, char *buf)
 {
 	struct hci_dev *hdev = dev_get_drvdata(dev);
 	return sprintf(buf, "%d\n", hdev->hci_ver);
 }

 static ssize_t show_hci_revision(struct device *dev, struct device_attribute *attr, char *buf)
 {
 	struct hci_dev *hdev = dev_get_drvdata(dev);
 	return sprintf(buf, "%d\n", hdev->hci_rev);
 }

 static ssize_t show_inquiry_cache(struct device *dev, struct device_attribute *attr, char *buf)
 {
 	struct hci_dev *hdev = dev_get_drvdata(dev);
 	struct inquiry_cache *cache = &hdev->inq_cache;
 	struct inquiry_entry *e;
 	int n = 0;

 	hci_dev_lock_bh(hdev);

 	for (e = cache->list; e; e = e->next) {
 		struct inquiry_data *data = &e->data;
 		bdaddr_t bdaddr;
 		baswap(&bdaddr, &data->bdaddr);
 		n += sprintf(buf + n, "%s %d %d %d 0x%.2x%.2x%.2x 0x%.4x %d %d %u\n",
 				batostr(&bdaddr),
 				data->pscan_rep_mode, data->pscan_period_mode,
 				data->pscan_mode, data->dev_class[2],
 				data->dev_class[1], data->dev_class[0],
 				__le16_to_cpu(data->clock_offset),
 				data->rssi, data->ssp_mode, e->timestamp);
 	}

 	hci_dev_unlock_bh(hdev);
 	return n;
 }

 static ssize_t show_idle_timeout(struct device *dev, struct device_attribute *attr, char *buf)
 {
 	struct hci_dev *hdev = dev_get_drvdata(dev);
 	return sprintf(buf, "%d\n", hdev->idle_timeout);
 }

 static ssize_t store_idle_timeout(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 {
 	struct hci_dev *hdev = dev_get_drvdata(dev);
 	char *ptr;
 	__u32 val;

 	val = simple_strtoul(buf, &ptr, 10);
 	if (ptr == buf)
 		return -EINVAL;

 	if (val != 0 && (val < 500 || val > 3600000))
 		return -EINVAL;

 	hdev->idle_timeout = val;

 	return count;
 }

 static ssize_t show_sniff_max_interval(struct device *dev, struct device_attribute *attr, char *buf)
 {
 	struct hci_dev *hdev = dev_get_drvdata(dev);
 	return sprintf(buf, "%d\n", hdev->sniff_max_interval);
 }

 static ssize_t store_sniff_max_interval(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 {
 	struct hci_dev *hdev = dev_get_drvdata(dev);
 	char *ptr;
 	__u16 val;

 	val = simple_strtoul(buf, &ptr, 10);
 	if (ptr == buf)
 		return -EINVAL;

 	if (val < 0x0002 || val > 0xFFFE || val % 2)
 		return -EINVAL;

 	if (val < hdev->sniff_min_interval)
 		return -EINVAL;

 	hdev->sniff_max_interval = val;

 	return count;
 }

 static ssize_t show_sniff_min_interval(struct device *dev, struct device_attribute *attr, char *buf)
 {
 	struct hci_dev *hdev = dev_get_drvdata(dev);
 	return sprintf(buf, "%d\n", hdev->sniff_min_interval);
 }

 static ssize_t store_sniff_min_interval(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 {
 	struct hci_dev *hdev = dev_get_drvdata(dev);
 	char *ptr;
 	__u16 val;

 	val = simple_strtoul(buf, &ptr, 10);
 	if (ptr == buf)
 		return -EINVAL;

 	if (val < 0x0002 || val > 0xFFFE || val % 2)
 		return -EINVAL;

 	if (val > hdev->sniff_max_interval)
 		return -EINVAL;

 	hdev->sniff_min_interval = val;

 	return count;
 }

 static DEVICE_ATTR(type, S_IRUGO, show_type, NULL);
 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
 static DEVICE_ATTR(class, S_IRUGO, show_class, NULL);
 static DEVICE_ATTR(address, S_IRUGO, show_address, NULL);
 static DEVICE_ATTR(features, S_IRUGO, show_features, NULL);
 static DEVICE_ATTR(manufacturer, S_IRUGO, show_manufacturer, NULL);
 static DEVICE_ATTR(hci_version, S_IRUGO, show_hci_version, NULL);
 static DEVICE_ATTR(hci_revision, S_IRUGO, show_hci_revision, NULL);
 static DEVICE_ATTR(inquiry_cache, S_IRUGO, show_inquiry_cache, NULL);

 static DEVICE_ATTR(idle_timeout, S_IRUGO | S_IWUSR,
 				show_idle_timeout, store_idle_timeout);
 static DEVICE_ATTR(sniff_max_interval, S_IRUGO | S_IWUSR,
 				show_sniff_max_interval, store_sniff_max_interval);
 static DEVICE_ATTR(sniff_min_interval, S_IRUGO | S_IWUSR,
 				show_sniff_min_interval, store_sniff_min_interval);

 static struct attribute *bt_host_attrs[] = {
 	&dev_attr_type.attr,
 	&dev_attr_name.attr,
 	&dev_attr_class.attr,
 	&dev_attr_address.attr,
 	&dev_attr_features.attr,
 	&dev_attr_manufacturer.attr,
 	&dev_attr_hci_version.attr,
 	&dev_attr_hci_revision.attr,
 	&dev_attr_inquiry_cache.attr,
 	&dev_attr_idle_timeout.attr,
 	&dev_attr_sniff_max_interval.attr,
 	&dev_attr_sniff_min_interval.attr,
 	NULL
 };

 static struct attribute_group bt_host_group = {
 	.attrs = bt_host_attrs,
 };

 static struct attribute_group *bt_host_groups[] = {
 	&bt_host_group,
 	NULL
 };

 static void bt_host_release(struct device *dev)
 {
 	void *data = dev_get_drvdata(dev);
 	kfree(data);
 }

 static struct device_type bt_host = {
 	.name    = "host",
 	.groups  = bt_host_groups,
 	.release = bt_host_release,
 };

 int hci_register_sysfs(struct hci_dev *hdev)
 {
 	struct device *dev = &hdev->dev;
 	int err;

 	BT_DBG("%p name %s type %d", hdev, hdev->name, hdev->type);

 	dev->type = &bt_host;
 	dev->class = bt_class;
 	dev->parent = hdev->parent;

 	dev_set_name(dev, "%s", hdev->name);

 	dev_set_drvdata(dev, hdev);

 	err = device_register(dev);
 	if (err < 0)
 		return err;

 	return 0;
 }

 void hci_unregister_sysfs(struct hci_dev *hdev)
 {
 	BT_DBG("%p name %s type %d", hdev, hdev->name, hdev->type);

 	device_del(&hdev->dev);
 }

 int __init bt_sysfs_init(void)
 {
 	bt_workq = create_singlethread_workqueue("bluetooth");
 	if (!bt_workq)
 		return -ENOMEM;

 	bt_class = class_create(THIS_MODULE, "bluetooth");
 	if (IS_ERR(bt_class)) {
 		destroy_workqueue(bt_workq);
 		return PTR_ERR(bt_class);
 	}

 	return 0;
 }

 void bt_sysfs_cleanup(void)
 {
 	destroy_workqueue(bt_workq);

 	class_destroy(bt_class);
 }
	/* Bluetooth HCI driver model support. */

	#include <linux/kernel.h>
	#include <linux/init.h>

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

	struct class *bt_class = NULL;
	EXPORT_SYMBOL_GPL(bt_class);

	static struct workqueue_struct *bt_workq;

	static inline char *link_typetostr(int type)
	{
	switch (type) {
	case ACL_LINK:
	return "ACL";
	case SCO_LINK:
	return "SCO";
	case ESCO_LINK:
	return "eSCO";
	default:
	return "UNKNOWN";
	}
	}

	static ssize_t show_link_type(struct device dev, struct device_attribute attr, char *buf)
	{
	struct hci_conn *conn = dev_get_drvdata(dev);
	return sprintf(buf, "%s\n", link_typetostr(conn->type));
	}

	static ssize_t show_link_address(struct device dev, struct device_attribute attr, char *buf)
	{
	struct hci_conn *conn = dev_get_drvdata(dev);
	bdaddr_t bdaddr;
	baswap(&bdaddr, &conn->dst);
	return sprintf(buf, "%s\n", batostr(&bdaddr));
	}

	static ssize_t show_link_features(struct device dev, struct device_attribute attr, char *buf)
	{
	struct hci_conn *conn = dev_get_drvdata(dev);

	return sprintf(buf, "0x%02x%02x%02x%02x%02x%02x%02x%02x\n",
	conn->features[0], conn->features[1],
	conn->features[2], conn->features[3],
	conn->features[4], conn->features[5],
	conn->features[6], conn->features[7]);
	}

	#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 LINK_ATTR(features, S_IRUGO, show_link_features, NULL);

	static struct attribute *bt_link_attrs[] = {
	&link_attr_type.attr,
	&link_attr_address.attr,
	&link_attr_features.attr,
	NULL
	};

	static struct attribute_group bt_link_group = {
	.attrs = bt_link_attrs,
	};

	static struct attribute_group *bt_link_groups[] = {
	&bt_link_group,
	NULL
	};

	static void bt_link_release(struct device *dev)
	{
	void *data = dev_get_drvdata(dev);
	kfree(data);
	}

	static struct device_type bt_link = {
	.name = "link",
	.groups = bt_link_groups,
	.release = bt_link_release,
	};

	static void add_conn(struct work_struct *work)
	{
	struct hci_conn *conn = container_of(work, struct hci_conn, work_add);
	struct hci_dev *hdev = conn->hdev;

	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);
	}

	/*
	* 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);
	}

	static void del_conn(struct work_struct *work)
	{
	struct hci_conn *conn = container_of(work, struct hci_conn, work_del);
	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);
	put_device(&conn->dev);

	hci_dev_put(hdev);
	}

	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;

	dev_set_drvdata(&conn->dev, conn);

	device_initialize(&conn->dev);

	INIT_WORK(&conn->work_add, add_conn);
	INIT_WORK(&conn->work_del, del_conn);
	}

	void hci_conn_add_sysfs(struct hci_conn *conn)
	{
	BT_DBG("conn %p", conn);

	queue_work(bt_workq, &conn->work_add);
	}

	void hci_conn_del_sysfs(struct hci_conn *conn)
	{
	BT_DBG("conn %p", conn);

	queue_work(bt_workq, &conn->work_del);
	}

	static inline char *host_typetostr(int type)
	{
	switch (type) {
	case HCI_VIRTUAL:
	return "VIRTUAL";
	case HCI_USB:
	return "USB";
	case HCI_PCCARD:
	return "PCCARD";
	case HCI_UART:
	return "UART";
	case HCI_RS232:
	return "RS232";
	case HCI_PCI:
	return "PCI";
	case HCI_SDIO:
	return "SDIO";
	default:
	return "UNKNOWN";
	}
	}

	static ssize_t show_type(struct device dev, struct device_attribute attr, char *buf)
	{
	struct hci_dev *hdev = dev_get_drvdata(dev);
	return sprintf(buf, "%s\n", host_typetostr(hdev->type));
	}

	static ssize_t show_name(struct device dev, struct device_attribute attr, char *buf)
	{
	struct hci_dev *hdev = dev_get_drvdata(dev);
	char name[249];
	int i;

	for (i = 0; i < 248; i++)
	name[i] = hdev->dev_name[i];

	name[248] = '\0';
	return sprintf(buf, "%s\n", name);
	}

	static ssize_t show_class(struct device dev, struct device_attribute attr, char *buf)
	{
	struct hci_dev *hdev = dev_get_drvdata(dev);
	return sprintf(buf, "0x%.2x%.2x%.2x\n",
	hdev->dev_class[2], hdev->dev_class[1], hdev->dev_class[0]);
	}

	static ssize_t show_address(struct device dev, struct device_attribute attr, char *buf)
	{
	struct hci_dev *hdev = dev_get_drvdata(dev);
	bdaddr_t bdaddr;
	baswap(&bdaddr, &hdev->bdaddr);
	return sprintf(buf, "%s\n", batostr(&bdaddr));
	}

	static ssize_t show_features(struct device dev, struct device_attribute attr, char *buf)
	{
	struct hci_dev *hdev = dev_get_drvdata(dev);

	return sprintf(buf, "0x%02x%02x%02x%02x%02x%02x%02x%02x\n",
	hdev->features[0], hdev->features[1],
	hdev->features[2], hdev->features[3],
	hdev->features[4], hdev->features[5],
	hdev->features[6], hdev->features[7]);
	}

	static ssize_t show_manufacturer(struct device dev, struct device_attribute attr, char *buf)
	{
	struct hci_dev *hdev = dev_get_drvdata(dev);
	return sprintf(buf, "%d\n", hdev->manufacturer);
	}

	static ssize_t show_hci_version(struct device dev, struct device_attribute attr, char *buf)
	{
	struct hci_dev *hdev = dev_get_drvdata(dev);
	return sprintf(buf, "%d\n", hdev->hci_ver);
	}

	static ssize_t show_hci_revision(struct device dev, struct device_attribute attr, char *buf)
	{
	struct hci_dev *hdev = dev_get_drvdata(dev);
	return sprintf(buf, "%d\n", hdev->hci_rev);
	}

	static ssize_t show_inquiry_cache(struct device dev, struct device_attribute attr, char *buf)
	{
	struct hci_dev *hdev = dev_get_drvdata(dev);
	struct inquiry_cache *cache = &hdev->inq_cache;
	struct inquiry_entry *e;
	int n = 0;

	hci_dev_lock_bh(hdev);

	for (e = cache->list; e; e = e->next) {
	struct inquiry_data *data = &e->data;
	bdaddr_t bdaddr;
	baswap(&bdaddr, &data->bdaddr);
	n += sprintf(buf + n, "%s %d %d %d 0x%.2x%.2x%.2x 0x%.4x %d %d %u\n",
	batostr(&bdaddr),
	data->pscan_rep_mode, data->pscan_period_mode,
	data->pscan_mode, data->dev_class[2],
	data->dev_class[1], data->dev_class[0],
	__le16_to_cpu(data->clock_offset),
	data->rssi, data->ssp_mode, e->timestamp);
	}

	hci_dev_unlock_bh(hdev);
	return n;
	}

	static ssize_t show_idle_timeout(struct device dev, struct device_attribute attr, char *buf)
	{
	struct hci_dev *hdev = dev_get_drvdata(dev);
	return sprintf(buf, "%d\n", hdev->idle_timeout);
	}

	static ssize_t store_idle_timeout(struct device dev, struct device_attribute attr, const char *buf, size_t count)
	{
	struct hci_dev *hdev = dev_get_drvdata(dev);
	char *ptr;
	__u32 val;

	val = simple_strtoul(buf, &ptr, 10);
	if (ptr == buf)
	return -EINVAL;

	if (val != 0 && (val < 500 \|\| val > 3600000))
	return -EINVAL;

	hdev->idle_timeout = val;

	return count;
	}

	static ssize_t show_sniff_max_interval(struct device dev, struct device_attribute attr, char *buf)
	{
	struct hci_dev *hdev = dev_get_drvdata(dev);
	return sprintf(buf, "%d\n", hdev->sniff_max_interval);
	}

	static ssize_t store_sniff_max_interval(struct device dev, struct device_attribute attr, const char *buf, size_t count)
	{
	struct hci_dev *hdev = dev_get_drvdata(dev);
	char *ptr;
	__u16 val;

	val = simple_strtoul(buf, &ptr, 10);
	if (ptr == buf)
	return -EINVAL;

	if (val < 0x0002 \|\| val > 0xFFFE \|\| val % 2)
	return -EINVAL;

	if (val < hdev->sniff_min_interval)
	return -EINVAL;

	hdev->sniff_max_interval = val;

	return count;
	}

	static ssize_t show_sniff_min_interval(struct device dev, struct device_attribute attr, char *buf)
	{
	struct hci_dev *hdev = dev_get_drvdata(dev);
	return sprintf(buf, "%d\n", hdev->sniff_min_interval);
	}

	static ssize_t store_sniff_min_interval(struct device dev, struct device_attribute attr, const char *buf, size_t count)
	{
	struct hci_dev *hdev = dev_get_drvdata(dev);
	char *ptr;
	__u16 val;

	val = simple_strtoul(buf, &ptr, 10);
	if (ptr == buf)
	return -EINVAL;

	if (val < 0x0002 \|\| val > 0xFFFE \|\| val % 2)
	return -EINVAL;

	if (val > hdev->sniff_max_interval)
	return -EINVAL;

	hdev->sniff_min_interval = val;

	return count;
	}

	static DEVICE_ATTR(type, S_IRUGO, show_type, NULL);
	static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
	static DEVICE_ATTR(class, S_IRUGO, show_class, NULL);
	static DEVICE_ATTR(address, S_IRUGO, show_address, NULL);
	static DEVICE_ATTR(features, S_IRUGO, show_features, NULL);
	static DEVICE_ATTR(manufacturer, S_IRUGO, show_manufacturer, NULL);
	static DEVICE_ATTR(hci_version, S_IRUGO, show_hci_version, NULL);
	static DEVICE_ATTR(hci_revision, S_IRUGO, show_hci_revision, NULL);
	static DEVICE_ATTR(inquiry_cache, S_IRUGO, show_inquiry_cache, NULL);

	static DEVICE_ATTR(idle_timeout, S_IRUGO \| S_IWUSR,
	show_idle_timeout, store_idle_timeout);
	static DEVICE_ATTR(sniff_max_interval, S_IRUGO \| S_IWUSR,
	show_sniff_max_interval, store_sniff_max_interval);
	static DEVICE_ATTR(sniff_min_interval, S_IRUGO \| S_IWUSR,
	show_sniff_min_interval, store_sniff_min_interval);

	static struct attribute *bt_host_attrs[] = {
	&dev_attr_type.attr,
	&dev_attr_name.attr,
	&dev_attr_class.attr,
	&dev_attr_address.attr,
	&dev_attr_features.attr,
	&dev_attr_manufacturer.attr,
	&dev_attr_hci_version.attr,
	&dev_attr_hci_revision.attr,
	&dev_attr_inquiry_cache.attr,
	&dev_attr_idle_timeout.attr,
	&dev_attr_sniff_max_interval.attr,
	&dev_attr_sniff_min_interval.attr,
	NULL
	};

	static struct attribute_group bt_host_group = {
	.attrs = bt_host_attrs,
	};

	static struct attribute_group *bt_host_groups[] = {
	&bt_host_group,
	NULL
	};

	static void bt_host_release(struct device *dev)
	{
	void *data = dev_get_drvdata(dev);
	kfree(data);
	}

	static struct device_type bt_host = {
	.name = "host",
	.groups = bt_host_groups,
	.release = bt_host_release,
	};

	int hci_register_sysfs(struct hci_dev *hdev)
	{
	struct device *dev = &hdev->dev;
	int err;

	BT_DBG("%p name %s type %d", hdev, hdev->name, hdev->type);

	dev->type = &bt_host;
	dev->class = bt_class;
	dev->parent = hdev->parent;

	dev_set_name(dev, "%s", hdev->name);

	dev_set_drvdata(dev, hdev);

	err = device_register(dev);
	if (err < 0)
	return err;

	return 0;
	}

	void hci_unregister_sysfs(struct hci_dev *hdev)
	{
	BT_DBG("%p name %s type %d", hdev, hdev->name, hdev->type);

	device_del(&hdev->dev);
	}

	int __init bt_sysfs_init(void)
	{
	bt_workq = create_singlethread_workqueue("bluetooth");
	if (!bt_workq)
	return -ENOMEM;

	bt_class = class_create(THIS_MODULE, "bluetooth");
	if (IS_ERR(bt_class)) {
	destroy_workqueue(bt_workq);
	return PTR_ERR(bt_class);
	}

	return 0;
	}

	void bt_sysfs_cleanup(void)
	{
	destroy_workqueue(bt_workq);

	class_destroy(bt_class);
	}