Bluetooth: Add debugfs support to btmrvl driver

/debug/btmrvl/config/
/debug/btmrvl/status/

See Documentation/btmrvl.txt for details.

This patch incorporates a lot of comments given by
Nicolas Pitre <nico@marvell.com>. Many thanks to Nicolas Pitre.

Signed-off-by: Rahul Tank <rahult@marvell.com>
Signed-off-by: Bing Zhao <bzhao@marvell.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

drivers/bluetooth/btmrvl_drv.h

@@ -79,6 +79,9 @@ struct btmrvl_private {
 				u8 *payload, u16 nb);
 	int (*hw_wakeup_firmware) (struct btmrvl_private *priv);
 	spinlock_t driver_lock;		/* spinlock used by driver */
+#ifdef CONFIG_DEBUG_FS
+	void *debugfs_data;
+#endif
 };
 
 #define MRVL_VENDOR_PKT			0xFE
@@ -135,4 +138,9 @@ int btmrvl_process_event(struct btmrvl_private *priv, struct sk_buff *skb);
 int btmrvl_send_module_cfg_cmd(struct btmrvl_private *priv, int subcmd);
 int btmrvl_prepare_command(struct btmrvl_private *priv);
 
+#ifdef CONFIG_DEBUG_FS
+void btmrvl_debugfs_init(struct hci_dev *hdev);
+void btmrvl_debugfs_remove(struct hci_dev *hdev);
+#endif
+
 #endif /* _BTMRVL_DRV_H_ */