diff --git a/src/class/hid/hid_host.c b/src/class/hid/hid_host.c
index 83e65dc5..dc29f732 100644
--- a/src/class/hid/hid_host.c
+++ b/src/class/hid/hid_host.c
@@ -82,26 +82,25 @@ typedef struct
 
 static hidh_device_t _hidh_dev[CFG_TUSB_HOST_DEVICE_MAX-1];
 
+//------------- Internal prototypes -------------//
 TU_ATTR_ALWAYS_INLINE static inline hidh_device_t* get_dev(uint8_t dev_addr);
 TU_ATTR_ALWAYS_INLINE static inline hidh_interface_t* get_instance(uint8_t dev_addr, uint8_t instance);
-static uint8_t get_instance_id(uint8_t dev_addr, uint8_t itf);
-static hidh_interface_t* get_interface(uint8_t dev_addr, uint8_t itf);
+static uint8_t get_instance_id_by_itfnum(uint8_t dev_addr, uint8_t itf);
+static hidh_interface_t* get_instance_by_itfnum(uint8_t dev_addr, uint8_t itf);
+static uint8_t get_instance_id_by_epaddr(uint8_t dev_addr, uint8_t ep_addr);
 
 //--------------------------------------------------------------------+
 // Application API
 //--------------------------------------------------------------------+
-uint8_t tuh_n_hid_instance_count(uint8_t daddr)
+
+uint8_t tuh_n_hid_instance_count(uint8_t dev_addr)
 {
-  return get_dev(daddr)->inst_count;
+  return get_dev(dev_addr)->inst_count;
 }
 
-//--------------------------------------------------------------------+
-// HID Interface common functions
-//--------------------------------------------------------------------+
-
-bool tuh_n_hid_n_mounted(uint8_t daddr, uint8_t instance)
+bool tuh_n_hid_n_mounted(uint8_t dev_addr, uint8_t instance)
 {
-  hidh_interface_t* hid_itf = get_instance(daddr, instance);
+  hidh_interface_t* hid_itf = get_instance(dev_addr, instance);
   return (hid_itf->ep_in != 0) || (hid_itf->ep_out != 0);
 }
 
@@ -113,29 +112,29 @@ bool tuh_n_hid_n_ready(uint8_t dev_addr, uint8_t instance)
   return !hcd_edpt_busy(dev_addr, hid_itf->ep_in);
 }
 
-bool tuh_n_hid_n_get_report(uint8_t daddr, uint8_t instance, void* report, uint16_t len)
+bool tuh_n_hid_n_get_report(uint8_t dev_addr, uint8_t instance, void* report, uint16_t len)
 {
-  TU_VERIFY( tuh_device_ready(daddr) && report && len);
-  hidh_interface_t* hid_itf = get_instance(daddr, instance);
+  TU_VERIFY( tuh_device_ready(dev_addr) && report && len);
+  hidh_interface_t* hid_itf = get_instance(dev_addr, instance);
 
   // TODO change to claim endpoint
-  TU_VERIFY( !hcd_edpt_busy(daddr, hid_itf->ep_in) );
+  TU_VERIFY( !hcd_edpt_busy(dev_addr, hid_itf->ep_in) );
 
   len = tu_min16(len, hid_itf->ep_size);
 
-  return usbh_edpt_xfer(daddr, hid_itf->ep_in, report, len);
+  return usbh_edpt_xfer(dev_addr, hid_itf->ep_in, report, len);
 }
 
 //--------------------------------------------------------------------+
 // KEYBOARD
 //--------------------------------------------------------------------+
 
-bool tuh_n_hid_n_keyboard_mounted(uint8_t daddr, uint8_t instance)
+bool tuh_n_hid_n_keyboard_mounted(uint8_t dev_addr, uint8_t instance)
 {
-  hidh_interface_t* hid_itf = get_instance(daddr, instance);
+  hidh_interface_t* hid_itf = get_instance(dev_addr, instance);
 
   // TODO check rid_keyboard
-  return tuh_device_ready(daddr) && (hid_itf->ep_in != 0);
+  return tuh_device_ready(dev_addr) && (hid_itf->ep_in != 0);
 }
 
 //--------------------------------------------------------------------+
@@ -164,26 +163,16 @@ void hidh_init(void)
 
 bool hidh_xfer_cb(uint8_t dev_addr, uint8_t ep_addr, xfer_result_t event, uint32_t xferred_bytes)
 {
-  (void) xferred_bytes; // TODO may need to use this para later
+  uint8_t const dir = tu_edpt_dir(ep_addr);
+  uint8_t const instance = get_instance_id_by_epaddr(dev_addr, ep_addr);
 
-//  uint8_t itf = 0;
-//  hidh_interface_t* hid_itf = &_hidh_itf[itf];
-
-#if CFG_TUH_HID_KEYBOARD
-//  if ( ep_addr == keyboardh_data[dev_addr-1].ep_in )
-//  {
-//    tuh_hid_keyboard_isr(dev_addr, event);
-//    return true;
-//  }
-#endif
-
-#if CFG_TUH_HID_MOUSE
-//  if ( ep_addr == mouseh_data[dev_addr-1].ep_in )
-//  {
-//    tuh_hid_mouse_isr(dev_addr, event);
-//    return true;
-//  }
-#endif
+  if ( dir == TUSB_DIR_IN )
+  {
+    if (tuh_hid_get_report_complete_cb) tuh_hid_get_report_complete_cb(dev_addr, instance, xferred_bytes);
+  }else
+  {
+    if (tuh_hid_set_report_complete_cb) tuh_hid_set_report_complete_cb(dev_addr, instance, xferred_bytes);
+  }
 
   return true;
 }
@@ -311,7 +300,7 @@ bool config_set_idle_complete(uint8_t dev_addr, tusb_control_request_t const * r
 
   uint8_t const itf_num = (uint8_t) request->wIndex;
 
-  hidh_interface_t* hid_itf = get_interface(dev_addr, itf_num);
+  hidh_interface_t* hid_itf = get_instance_by_itfnum(dev_addr, itf_num);
 
   // Get Report Descriptor
   // using usbh enumeration buffer since report descriptor can be very long
@@ -340,7 +329,7 @@ bool config_get_report_desc_complete(uint8_t dev_addr, tusb_control_request_t co
 {
   TU_ASSERT(XFER_RESULT_SUCCESS == result);
   uint8_t const itf_num = (uint8_t) request->wIndex;
-  uint8_t const inst = get_instance_id(dev_addr, itf_num);
+  uint8_t const inst = get_instance_id_by_itfnum(dev_addr, itf_num);
   //hidh_interface_t* hid_itf = get_instance(dev_addr, inst);
 
   if (tuh_hid_descriptor_report_cb)
@@ -375,30 +364,43 @@ TU_ATTR_ALWAYS_INLINE static inline hidh_interface_t* get_instance(uint8_t dev_a
   return &_hidh_dev[dev_addr-1].instances[instance];
 }
 
-// Get instance ID by interface number
-static uint8_t get_instance_id(uint8_t dev_addr, uint8_t itf)
+// Get instance by interface number
+static hidh_interface_t* get_instance_by_itfnum(uint8_t dev_addr, uint8_t itf)
 {
   for ( uint8_t inst = 0; inst < CFG_TUH_HID; inst++ )
   {
     hidh_interface_t *hid = get_instance(dev_addr, inst);
 
-    if ( (hid->itf_num == itf) && (hid->ep_in != 0) ) return inst;
-  }
-
-  return 0xff;
-}
-
-// Get Interface by interface number
-static hidh_interface_t* get_interface(uint8_t dev_addr, uint8_t itf)
-{
-  for ( uint8_t inst = 0; inst < CFG_TUH_HID; inst++ )
-  {
-    hidh_interface_t *hid = get_instance(dev_addr, inst);
-
-    if ( (hid->itf_num == itf) && (hid->ep_in != 0) ) return hid;
+    if ( (hid->itf_num == itf) && (hid->ep_in || hid->ep_out) ) return hid;
   }
 
   return NULL;
 }
 
+// Get instance ID by interface number
+static uint8_t get_instance_id_by_itfnum(uint8_t dev_addr, uint8_t itf)
+{
+  for ( uint8_t inst = 0; inst < CFG_TUH_HID; inst++ )
+  {
+    hidh_interface_t *hid = get_instance(dev_addr, inst);
+
+    if ( (hid->itf_num == itf) && (hid->ep_in || hid->ep_out) ) return inst;
+  }
+
+  return 0xff;
+}
+
+// Get instance ID by endpoint address
+static uint8_t get_instance_id_by_epaddr(uint8_t dev_addr, uint8_t ep_addr)
+{
+  for ( uint8_t inst = 0; inst < CFG_TUH_HID; inst++ )
+  {
+    hidh_interface_t *hid = get_instance(dev_addr, inst);
+
+    if ( (ep_addr == hid->ep_in) || ( ep_addr == hid->ep_out) ) return inst;
+  }
+
+  return 0xff;
+}
+
 #endif
diff --git a/src/class/hid/hid_host.h b/src/class/hid/hid_host.h
index 23b23e65..45f03a19 100644
--- a/src/class/hid/hid_host.h
+++ b/src/class/hid/hid_host.h
@@ -58,22 +58,46 @@
 //--------------------------------------------------------------------+
 
 // Get the number of HID instances
-uint8_t tuh_n_hid_instance_count(uint8_t daddr);
+uint8_t tuh_n_hid_instance_count(uint8_t dev_addr);
 
 // Check if HID instance is mounted
-bool tuh_n_hid_n_mounted(uint8_t daddr, uint8_t instance);
+bool tuh_n_hid_n_mounted(uint8_t dev_addr, uint8_t instance);
 
 // Check if the interface is ready to use
 bool tuh_n_hid_n_ready(uint8_t dev_addr, uint8_t instance);
 
-bool tuh_n_hid_n_get_report(uint8_t daddr, uint8_t instance, void* report, uint16_t len);
+// Get Report from device
+bool tuh_n_hid_n_get_report(uint8_t dev_addr, uint8_t instance, void* report, uint16_t len);
+
+
+
+//-------------  -------------//
 
 // Check if HID instance with Keyboard is mounted
-bool tuh_n_hid_n_keyboard_mounted(uint8_t daddr, uint8_t instance);
+bool tuh_n_hid_n_keyboard_mounted(uint8_t dev_addr, uint8_t instance);
 
 // Check if HID instance with Mouse is mounted
 bool tuh_n_hid_n_mouse_mounted(uint8_t dev_addr, uint8_t instance);
 
+//--------------------------------------------------------------------+
+// Callbacks (Weak is optional)
+//--------------------------------------------------------------------+
+
+// Invoked when report descriptor is received
+// Note: enumeration is still not complete yet at this time
+TU_ATTR_WEAK void tuh_hid_descriptor_report_cb(uint8_t dev_addr, uint8_t instance, uint8_t const* report_desc, uint16_t desc_len);
+
+// Invoked when device with hid interface is mounted
+TU_ATTR_WEAK void tuh_hid_mounted_cb  (uint8_t dev_addr, uint8_t instance);
+
+// Invoked when device with hid interface is un-mounted
+TU_ATTR_WEAK void tuh_hid_unmounted_cb(uint8_t dev_addr, uint8_t instance);
+
+// Invoked when received Report from device
+TU_ATTR_WEAK void tuh_hid_get_report_complete_cb(uint8_t dev_addr, uint8_t instance, uint8_t xferred_bytes);
+
+// Invoked when Sent Report to device
+TU_ATTR_WEAK void tuh_hid_set_report_complete_cb(uint8_t dev_addr, uint8_t instance, uint8_t xferred_bytes);
 
 //--------------------------------------------------------------------+
 // Application API (Single device)
@@ -86,106 +110,6 @@ uint8_t tuh_hid_instance_count(void)
   return tuh_n_hid_instance_count(1);
 }
 
-//bool tuh_hid_get_report(uint8_t dev_addr, uint8_t report_id, void * p_report, uint8_t len);
-
-//--------------------------------------------------------------------+
-// Callbacks (Weak is optional)
-//--------------------------------------------------------------------+
-
-// Invoked when report descriptor is received
-// Note: enumeration is still not complete yet
-TU_ATTR_WEAK void tuh_hid_descriptor_report_cb(uint8_t daddr, uint8_t instance, uint8_t const* report_desc, uint16_t desc_len);
-
-TU_ATTR_WEAK void tuh_hid_mounted_cb  (uint8_t dev_addr, uint8_t instance);
-TU_ATTR_WEAK void tuh_hid_unmounted_cb(uint8_t dev_addr, uint8_t instance);
-
-
-
-//--------------------------------------------------------------------+
-// KEYBOARD Application API
-//--------------------------------------------------------------------+
-/** \addtogroup ClassDriver_HID_Keyboard Keyboard
- *  @{ */
-
-/** \defgroup Keyboard_Host Host
- *  The interface API includes status checking function, data transferring function and callback functions
- *  @{ */
-
-/** \brief      Check if device supports Keyboard interface or not
- * \param[in]   dev_addr    device address
- * \retval      true if device supports Keyboard interface
- * \retval      false if device does not support Keyboard interface or is not mounted
- */
-bool tuh_hid_keyboard_mounted(uint8_t dev_addr);
-
-/** \brief      Check if the interface is currently busy or not
- * \param[in]   dev_addr device address
- * \retval      true if the interface is busy meaning the stack is still transferring/waiting data from/to device
- * \retval      false if the interface is not busy meaning the stack successfully transferred data from/to device
- * \note        This function is primarily used for polling/waiting result after \ref tuh_hid_keyboard_get_report.
- *              Alternatively, asynchronous event API can be used
- */
-
-//------------- Application Callback -------------//
-/** \brief      Callback function that is invoked when an transferring event occurred
- * \param[in]		dev_addr	Address of device
- * \param[in]   event an value from \ref xfer_result_t
- * \note        event can be one of following
- *              - XFER_RESULT_SUCCESS : previously scheduled transfer completes successfully.
- *              - XFER_RESULT_FAILED   : previously scheduled transfer encountered a transaction error.
- *              - XFER_RESULT_STALLED : previously scheduled transfer is stalled by device.
- * \note        Application should schedule the next report by calling \ref tuh_hid_keyboard_get_report within this callback
- */
-void tuh_hid_keyboard_isr(uint8_t dev_addr, xfer_result_t event);
-
-/** \brief 			Callback function that will be invoked when a device with Keyboard interface is mounted
- * \param[in] 	dev_addr Address of newly mounted device
- * \note        This callback should be used by Application to set-up interface-related data
- */
-void tuh_hid_keyboard_mounted_cb(uint8_t dev_addr);
-
-/** \brief 			Callback function that will be invoked when a device with Keyboard interface is unmounted
- * \param[in] 	dev_addr Address of newly unmounted device
- * \note        This callback should be used by Application to tear-down interface-related data
- */
-void tuh_hid_keyboard_unmounted_cb(uint8_t dev_addr);
-
-/** @} */ // Keyboard_Host
-/** @} */ // ClassDriver_HID_Keyboard
-
-//--------------------------------------------------------------------+
-// MOUSE Application API
-//--------------------------------------------------------------------+
-/** \addtogroup ClassDriver_HID_Mouse Mouse
- *  @{ */
-
-/** \defgroup Mouse_Host Host
- *  The interface API includes status checking function, data transferring function and callback functions
- *  @{ */
-
-//------------- Application Callback -------------//
-/** \brief      Callback function that is invoked when an transferring event occurred
- * \param[in]		dev_addr	Address of device
- * \param[in]   event an value from \ref xfer_result_t
- * \note        event can be one of following
- *              - XFER_RESULT_SUCCESS : previously scheduled transfer completes successfully.
- *              - XFER_RESULT_FAILED   : previously scheduled transfer encountered a transaction error.
- *              - XFER_RESULT_STALLED : previously scheduled transfer is stalled by device.
- * \note        Application should schedule the next report by calling \ref tuh_hid_mouse_get_report within this callback
- */
-void tuh_hid_mouse_isr(uint8_t dev_addr, xfer_result_t event);
-
-/** \brief 			Callback function that will be invoked when a device with Mouse interface is mounted
- * \param[in]	  dev_addr Address of newly mounted device
- * \note        This callback should be used by Application to set-up interface-related data
- */
-void tuh_hid_mouse_mounted_cb(uint8_t dev_addr);
-
-/** \brief 			Callback function that will be invoked when a device with Mouse interface is unmounted
- * \param[in] 	dev_addr Address of newly unmounted device
- * \note        This callback should be used by Application to tear-down interface-related data
- */
-void tuh_hid_mouse_unmounted_cb(uint8_t dev_addr);
 
 //--------------------------------------------------------------------+
 // Internal Class Driver API