Bluetooth: Expose current identity information in debugfs

When using LE Privacy it is useful to know the local identity address,
identity address type and identity resolving key. For debugging purposes
add these information to debugfs.
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>

net/bluetooth/hci_core.c

@@ -579,6 +579,42 @@ static int sniff_max_interval_get(void *data, u64 *val)
 DEFINE_SIMPLE_ATTRIBUTE(sniff_max_interval_fops, sniff_max_interval_get,
 			sniff_max_interval_set, "%llu\n");
 
+static int identity_show(struct seq_file *f, void *p)
+{
+	struct hci_dev *hdev = f->private;
+	bdaddr_t *addr;
+	u8 addr_type;
+
+	hci_dev_lock(hdev);
+
+	if (test_bit(HCI_FORCE_STATIC_ADDR, &hdev->dev_flags) ||
+	    !bacmp(&hdev->bdaddr, BDADDR_ANY)) {
+		addr = &hdev->static_addr;
+		addr_type = ADDR_LE_DEV_RANDOM;
+	} else {
+		addr = &hdev->bdaddr;
+		addr_type = ADDR_LE_DEV_PUBLIC;
+	}
+
+	seq_printf(f, "%pMR (type %u) %*phN\n", addr, addr_type, 16, hdev->irk);
+
+	hci_dev_unlock(hdev);
+
+	return 0;
+}
+
+static int identity_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, identity_show, inode->i_private);
+}
+
+static const struct file_operations identity_fops = {
+	.open		= identity_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= single_release,
+};
+
 static int random_address_show(struct seq_file *f, void *p)
 {
 	struct hci_dev *hdev = f->private;
@@ -1624,12 +1660,14 @@ static int __hci_init(struct hci_dev *hdev)
 	}
 
 	if (lmp_le_capable(hdev)) {
+		debugfs_create_file("identity", 0400, hdev->debugfs,
+				    hdev, &identity_fops);
+		debugfs_create_file("rpa_timeout", 0644, hdev->debugfs,
+				    hdev, &rpa_timeout_fops);
 		debugfs_create_file("random_address", 0444, hdev->debugfs,
 				    hdev, &random_address_fops);
 		debugfs_create_file("static_address", 0444, hdev->debugfs,
 				    hdev, &static_address_fops);
-		debugfs_create_file("rpa_timeout", 0644, hdev->debugfs,
-				    hdev, &rpa_timeout_fops);
 
 		/* For controllers with a public address, provide a debug
 		 * option to force the usage of the configured static