Add bt hci device class

Code implements USB transport for bluetooth HCI.

6 files changed, 437 insertions, 0 deletions

diff --git a/src/class/bth/bth_device.c b/src/class/bth/bth_device.c
new file mode 100755
index 000000000..04011bcdb
--- /dev/null
+++ b/src/class/bth/bth_device.c
@@ -0,0 +1,252 @@
+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020 Jerzy Kasenberg
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * This file is part of the TinyUSB stack.
+ */
+
+#include "tusb_option.h"
+
+#if (TUSB_OPT_DEVICE_ENABLED && CFG_TUD_BTH)
+
+//--------------------------------------------------------------------+
+// INCLUDE
+//--------------------------------------------------------------------+
+#include "bth_device.h"
+#include <common/tusb_types.h>
+#include <device/usbd_pvt.h>
+
+//--------------------------------------------------------------------+
+// MACRO CONSTANT TYPEDEF
+//--------------------------------------------------------------------+
+typedef struct
+{
+  uint8_t itf_num;
+  uint8_t ep_ev;
+  uint8_t ep_acl_in;
+  uint8_t ep_acl_out;
+  uint8_t ep_voice[2];  // Not used yet
+  uint8_t ep_voice_size[2][CFG_TUD_BTH_ISO_ALT_COUNT];
+
+  // Endpoint Transfer buffer
+  CFG_TUSB_MEM_ALIGN bt_hci_cmd_t hci_cmd;
+  CFG_TUSB_MEM_ALIGN uint8_t epout_buf[CFG_TUD_BTH_DATA_EPSIZE];
+
+} btd_interface_t;
+
+//--------------------------------------------------------------------+
+// INTERNAL OBJECT & FUNCTION DECLARATION
+//--------------------------------------------------------------------+
+CFG_TUSB_MEM_SECTION btd_interface_t _btd_itf;
+
+static bool bt_tx_data(uint8_t ep, void *data, uint16_t len)
+{
+  // skip if previous transfer not complete
+  TU_VERIFY(!usbd_edpt_busy(TUD_OPT_RHPORT, ep));
+
+  TU_ASSERT(usbd_edpt_xfer(TUD_OPT_RHPORT, ep, data, len));
+
+  return true;
+}
+
+//--------------------------------------------------------------------+
+// READ API
+//--------------------------------------------------------------------+
+
+
+//--------------------------------------------------------------------+
+// WRITE API
+//--------------------------------------------------------------------+
+
+bool tud_bt_event_send(void *event, uint16_t event_len)
+{
+  return bt_tx_data(_btd_itf.ep_ev, event, event_len);
+}
+
+bool tud_bt_acl_data_send(void *event, uint16_t event_len)
+{
+  return bt_tx_data(_btd_itf.ep_acl_in, event, event_len);
+}
+
+//--------------------------------------------------------------------+
+// USBD Driver API
+//--------------------------------------------------------------------+
+void btd_init(void)
+{
+  tu_memclr(&_btd_itf, sizeof(_btd_itf));
+}
+
+void btd_reset(uint8_t rhport)
+{
+  (void)rhport;
+}
+
+uint16_t btd_open(uint8_t rhport, tusb_desc_interface_t const *itf_desc, uint16_t max_len)
+{
+  tusb_desc_endpoint_t const *desc_ep;
+  uint16_t drv_len = 0;
+  // Size of single alternative of ISO interface
+  const uint16_t iso_alt_itf_size = sizeof(tusb_desc_interface_t) + 2 * sizeof(tusb_desc_endpoint_t);
+  // Size of hci interface
+  const uint16_t hci_itf_size = sizeof(tusb_desc_interface_t) + 3 * sizeof(tusb_desc_endpoint_t);
+  // Ensure this is BT Primary Controller
+  TU_VERIFY(TUSB_CLASS_WIRELESS_CONTROLLER == itf_desc->bInterfaceClass &&
+            TUD_BT_APP_SUBCLASS == itf_desc->bInterfaceSubClass &&
+            TUD_BT_PROTOCOL_PRIMARY_CONTROLLER == itf_desc->bInterfaceProtocol, 0);
+
+  // Distinguish interface by number of endpoints, as both interface have same class, subclass and protocol
+  if (itf_desc->bNumEndpoints == 3 && max_len >= hci_itf_size)
+  {
+    _btd_itf.itf_num = itf_desc->bInterfaceNumber;
+
+    desc_ep = (tusb_desc_endpoint_t const *) tu_desc_next(itf_desc);
+
+    TU_ASSERT(TUSB_DESC_ENDPOINT == desc_ep->bDescriptorType && TUSB_XFER_INTERRUPT == desc_ep->bmAttributes.xfer, 0);
+    TU_ASSERT(dcd_edpt_open(rhport, desc_ep), 0);
+    _btd_itf.ep_ev = desc_ep->bEndpointAddress;
+
+    // Open endpoint pair
+    TU_ASSERT(usbd_open_edpt_pair(rhport, tu_desc_next(desc_ep), 2, TUSB_XFER_BULK, &_btd_itf.ep_acl_out,
+                                  &_btd_itf.ep_acl_in), 0);
+
+    // Prepare for incoming data from host
+    TU_ASSERT(usbd_edpt_xfer(rhport, _btd_itf.ep_acl_out, _btd_itf.epout_buf, CFG_TUD_BTH_DATA_EPSIZE), 0);
+
+    drv_len = hci_itf_size;
+  }
+  else if (itf_desc->bNumEndpoints == 2 && max_len >= iso_alt_itf_size)
+  {
+    uint8_t dir;
+
+    desc_ep = (tusb_desc_endpoint_t const *)tu_desc_next(itf_desc);
+    TU_ASSERT(itf_desc->bAlternateSetting < CFG_TUD_BTH_ISO_ALT_COUNT, 0);
+    TU_ASSERT(desc_ep->bDescriptorType == TUSB_DESC_ENDPOINT, 0);
+    dir = tu_edpt_dir(desc_ep->bEndpointAddress);
+    _btd_itf.ep_voice[dir] = desc_ep->bEndpointAddress;
+    // Store endpoint size for alternative
+    _btd_itf.ep_voice_size[dir][itf_desc->bAlternateSetting] = (uint8_t)desc_ep->wMaxPacketSize.size;
+
+    desc_ep = (tusb_desc_endpoint_t const *)tu_desc_next(desc_ep);
+    TU_ASSERT(desc_ep->bDescriptorType == TUSB_DESC_ENDPOINT, 0);
+    dir = tu_edpt_dir(desc_ep->bEndpointAddress);
+    _btd_itf.ep_voice[dir] = desc_ep->bEndpointAddress;
+    // Store endpoint size for alternative
+    _btd_itf.ep_voice_size[dir][itf_desc->bAlternateSetting] = (uint8_t)desc_ep->wMaxPacketSize.size;
+    drv_len += iso_alt_itf_size;
+
+    for (int i = 1; i < CFG_TUD_BTH_ISO_ALT_COUNT && drv_len + iso_alt_itf_size <= max_len; ++i) {
+      // Make sure rest of alternatives matches
+      itf_desc = (tusb_desc_interface_t const *)tu_desc_next(desc_ep);
+      if (itf_desc->bDescriptorType != TUSB_DESC_INTERFACE ||
+          TUSB_CLASS_WIRELESS_CONTROLLER != itf_desc->bInterfaceClass ||
+          TUD_BT_APP_SUBCLASS != itf_desc->bInterfaceSubClass ||
+          TUD_BT_PROTOCOL_PRIMARY_CONTROLLER != itf_desc->bInterfaceProtocol)
+      {
+        // Not an Iso interface instance
+        break;
+      }
+      TU_ASSERT(itf_desc->bAlternateSetting < CFG_TUD_BTH_ISO_ALT_COUNT, 0);
+
+      desc_ep = (tusb_desc_endpoint_t const *)tu_desc_next(itf_desc);
+      dir = tu_edpt_dir(desc_ep->bEndpointAddress);
+      // Verify that alternative endpoint are same as first ones
+      TU_ASSERT(desc_ep->bDescriptorType == TUSB_DESC_ENDPOINT &&
+                _btd_itf.ep_voice[dir] == desc_ep->bEndpointAddress, 0);
+      _btd_itf.ep_voice_size[dir][itf_desc->bAlternateSetting] = (uint8_t)desc_ep->wMaxPacketSize.size;
+
+      desc_ep = (tusb_desc_endpoint_t const *)tu_desc_next(desc_ep);
+      dir = tu_edpt_dir(desc_ep->bEndpointAddress);
+      // Verify that alternative endpoint are same as first ones
+      TU_ASSERT(desc_ep->bDescriptorType == TUSB_DESC_ENDPOINT &&
+                _btd_itf.ep_voice[dir] == desc_ep->bEndpointAddress, 0);
+      _btd_itf.ep_voice_size[dir][itf_desc->bAlternateSetting] = (uint8_t)desc_ep->wMaxPacketSize.size;
+      drv_len += iso_alt_itf_size;
+    }
+  }
+
+  return drv_len;
+}
+
+bool btd_control_complete(uint8_t rhport, tusb_control_request_t const *request)
+{
+  (void)rhport;
+
+  // Handle class request only
+  TU_VERIFY(request->bmRequestType_bit.type == TUSB_REQ_TYPE_CLASS);
+
+  if (tud_bt_hci_cmd_cb) tud_bt_hci_cmd_cb(&_btd_itf.hci_cmd, request->wLength);
+
+  return true;
+}
+
+bool btd_control_request(uint8_t rhport, tusb_control_request_t const *request)
+{
+  (void)rhport;
+
+  if (request->bmRequestType_bit.type == TUSB_REQ_TYPE_CLASS &&
+      request->bmRequestType_bit.recipient == TUSB_REQ_RCPT_DEVICE)
+  {
+    // HCI command packet addressing for single function Primary Controllers
+    TU_VERIFY(request->bRequest == 0 && request->wValue == 0 && request->wIndex == 0);
+  }
+  else if (request->bmRequestType_bit.recipient == TUSB_REQ_RCPT_INTERFACE)
+  {
+    if (request->bRequest == TUSB_REQ_SET_INTERFACE && _btd_itf.itf_num + 1 == request->wIndex)
+    {
+      // TODO: Set interface it would involve changing size of endpoint size
+    }
+    else
+    {
+      // HCI command packet for Primary Controller function in a composite device
+      TU_VERIFY(request->bRequest == 0 && request->wValue == 0 && request->wIndex == _btd_itf.itf_num);
+    }
+  }
+  else return false;
+
+  return tud_control_xfer(rhport, request, &_btd_itf.hci_cmd, request->wLength);
+}
+
+bool btd_xfer_cb(uint8_t rhport, uint8_t ep_addr, xfer_result_t result, uint32_t xferred_bytes)
+{
+  (void)result;
+
+  // received new data from host
+  if (ep_addr == _btd_itf.ep_acl_out)
+  {
+    if (tud_bt_acl_data_received_cb) tud_bt_acl_data_received_cb(_btd_itf.epout_buf, xferred_bytes);
+
+    // prepare for next data
+    TU_ASSERT(usbd_edpt_xfer(rhport, _btd_itf.ep_acl_out, _btd_itf.epout_buf, CFG_TUD_BTH_DATA_EPSIZE));
+  }
+  else if (ep_addr == _btd_itf.ep_ev)
+  {
+    if (tud_bt_event_sent_cb) tud_bt_event_sent_cb((uint16_t)xferred_bytes);
+  }
+  else if (ep_addr == _btd_itf.ep_acl_in)
+  {
+    if (tud_bt_acl_data_sent_cb) tud_bt_acl_data_sent_cb((uint16_t)xferred_bytes);
+  }
+
+  return TUSB_ERROR_NONE;
+}
+
+#endif
diff --git a/src/class/bth/bth_device.h b/src/class/bth/bth_device.h
new file mode 100755
index 000000000..5e5468084
--- /dev/null
+++ b/src/class/bth/bth_device.h
@@ -0,0 +1,110 @@
+/* 
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020 Jerzy Kasenberg
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * This file is part of the TinyUSB stack.
+ */
+
+#ifndef _TUSB_BTH_DEVICE_H_
+#define _TUSB_BTH_DEVICE_H_
+
+#include <common/tusb_common.h>
+#include <device/usbd.h>
+
+//--------------------------------------------------------------------+
+// Class Driver Configuration
+//--------------------------------------------------------------------+
+#ifndef CFG_TUD_BTH_EVENT_EPSIZE
+#define CFG_TUD_BTH_EVENT_EPSIZE     16
+#endif
+#ifndef CFG_TUD_BTH_DATA_EPSIZE
+#define CFG_TUD_BTH_DATA_EPSIZE      64
+#endif
+
+typedef struct TU_ATTR_PACKED
+{
+  uint16_t op_code;
+  uint8_t param_length;
+  uint8_t param[255];
+} bt_hci_cmd_t;
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+//--------------------------------------------------------------------+
+// Application Callback API (weak is optional)
+//--------------------------------------------------------------------+
+
+// Invoked when HCI command was received over USB from Bluetooth host.
+// Detailed format is described in Bluetooth core specification Vol 2,
+// Part E, 5.4.1.
+// Length of the command is from 3 bytes (2 bytes for OpCode,
+// 1 byte for parameter total length) to 258.
+TU_ATTR_WEAK void tud_bt_hci_cmd_cb(void *hci_cmd, size_t cmd_len);
+
+// Invoked when ACL data was received over USB from Bluetooth host.
+// Detailed format is described in Bluetooth core specification Vol 2,
+// Part E, 5.4.2.
+// Length is from 4 bytes, (12 bits for Handle, 4 bits for flags
+// and 16 bits for data total length) to endpoint size.
+TU_ATTR_WEAK void tud_bt_acl_data_received_cb(void *acl_data, uint16_t data_len);
+
+// Called when event sent with tud_bt_event_send() was delivered to BT stack.
+// Controller can release/reuse buffer with Event packet at this point.
+TU_ATTR_WEAK void tud_bt_event_sent_cb(uint16_t sent_bytes);
+
+// Called when ACL data that was sent with tud_bt_acl_data_send()
+// was delivered to BT stack.
+// Controller can release/reuse buffer with ACL packet at this point.
+TU_ATTR_WEAK void tud_bt_acl_data_sent_cb(uint16_t sent_bytes);
+
+// Bluetooth controller calls this function when it wants to send even packet
+// as described in Bluetooth core specification Vol 2, Part E, 5.4.4.
+// Event has at least 2 bytes, first is Event code second contains parameter
+// total length. Controller can release/reuse event memory after
+// tud_bt_event_sent_cb() is called.
+bool tud_bt_event_send(void *event, uint16_t event_len);
+
+// Bluetooth controller calls this to send ACL data packet
+// as described in Bluetooth core specification Vol 2, Part E, 5.4.2
+// Minimum length is 4 bytes, (12 bits for Handle, 4 bits for flags
+// and 16 bits for data total length). Upper limit is not limited
+// to endpoint size since buffer is allocate by controller
+// and must not be reused till tud_bt_acl_data_sent_cb() is called.
+bool tud_bt_acl_data_send(void *acl_data, uint16_t data_len);
+
+//--------------------------------------------------------------------+
+// Internal Class Driver API
+//--------------------------------------------------------------------+
+void     btd_init             (void);
+void     btd_reset            (uint8_t rhport);
+uint16_t btd_open             (uint8_t rhport, tusb_desc_interface_t const * itf_desc, uint16_t max_len);
+bool     btd_control_request  (uint8_t rhport, tusb_control_request_t const * request);
+bool     btd_control_complete (uint8_t rhport, tusb_control_request_t const * request);
+bool     btd_xfer_cb          (uint8_t rhport, uint8_t edpt_addr, xfer_result_t result, uint32_t xferred_bytes);
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif /* _TUSB_BTH_DEVICE_H_ */
diff --git a/src/device/usbd.c b/src/device/usbd.c
index 3cbd50644..fe392ef6e 100644
--- a/src/device/usbd.c
+++ b/src/device/usbd.c
@@ -199,6 +199,19 @@ static usbd_class_driver_t const _usbd_driver[] =
       .sof              = NULL,
   },
   #endif
+
+  #if CFG_TUD_BTH
+  {
+      DRIVER_NAME("BTH")
+      .init             = btd_init,
+      .reset            = btd_reset,
+      .open             = btd_open,
+      .control_request  = btd_control_request,
+      .control_complete = btd_control_complete,
+      .xfer_cb          = btd_xfer_cb,
+      .sof              = NULL
+  },
+  #endif
 };
 
 enum { USBD_CLASS_DRIVER_COUNT = TU_ARRAY_SIZE(_usbd_driver) };
diff --git a/src/device/usbd.h b/src/device/usbd.h
index ecef63e18..2070b50c6 100644
--- a/src/device/usbd.h
+++ b/src/device/usbd.h
@@ -438,6 +438,60 @@ TU_ATTR_WEAK bool tud_vendor_control_complete_cb(uint8_t rhport, tusb_control_re
   /* Endpoint Out */\
   7, TUSB_DESC_ENDPOINT, _epout, TUSB_XFER_BULK, U16_TO_U8S_LE(_epsize), 0
 
+//------------- BT Radio -------------//
+#define TUD_BT_APP_CLASS                    (TUSB_CLASS_WIRELESS_CONTROLLER)
+#define TUD_BT_APP_SUBCLASS                 0x01
+#define TUD_BT_PROTOCOL_PRIMARY_CONTROLLER  0x01
+#define TUD_BT_PROTOCOL_AMP_CONTROLLER      0x02
+
+#ifndef CFG_TUD_BTH_ISO_ALT_COUNT
+#define CFG_TUD_BTH_ISO_ALT_COUNT 0
+#endif
+
+// Length of template descriptor: 30 bytes + number of ISO alternatives * 23
+#define TUD_BTH_DESC_LEN (9 + 7 + 7 + 7 + (CFG_TUD_BTH_ISO_ALT_COUNT) * (9 + 7 + 7))
+
+/* Primary Interface */
+#define TUD_BTH_PRI_ITF(_itfnum, _stridx, _ep_evt, _ep_evt_size, _ep_evt_interval, _ep_in, _ep_out, _ep_size) \
+  9, TUSB_DESC_INTERFACE, _itfnum, _stridx, 3, TUD_BT_APP_CLASS, TUD_BT_APP_SUBCLASS, TUD_BT_PROTOCOL_PRIMARY_CONTROLLER, 0, \
+  /* Endpoint In for events */ \
+  7, TUSB_DESC_ENDPOINT, _ep_evt, TUSB_XFER_INTERRUPT, U16_TO_U8S_LE(_ep_evt_size), _ep_evt_interval, \
+  /* Endpoint In for ACL data */ \
+  7, TUSB_DESC_ENDPOINT, _ep_in, TUSB_XFER_BULK, U16_TO_U8S_LE(_ep_size), 1, \
+  /* Endpoint Out for ACL data */ \
+  7, TUSB_DESC_ENDPOINT, _ep_out, TUSB_XFER_BULK, U16_TO_U8S_LE(_ep_size), 1
+
+#define TUD_BTH_ISO_ITF(_itfnum, _alt, _ep_in, _ep_out, _n) ,\
+  /* Interface with 2 endpoints */ \
+  9, TUSB_DESC_INTERFACE, _itfnum, _alt, 2, TUD_BT_APP_CLASS, TUD_BT_APP_SUBCLASS, TUD_BT_PROTOCOL_PRIMARY_CONTROLLER, 0, \
+  /* Isochronous endpoints */ \
+  7, TUSB_DESC_ENDPOINT, _ep_in, TUSB_XFER_ISOCHRONOUS, U16_TO_U8S_LE(_n), 1, \
+  7, TUSB_DESC_ENDPOINT, _ep_out, TUSB_XFER_ISOCHRONOUS, U16_TO_U8S_LE(_n), 1
+
+#define _FIRST(a, ...) a
+#define _REST(a, ...) __VA_ARGS__
+
+#define TUD_BTH_ISO_ITF_0(_itfnum, ...)
+#define TUD_BTH_ISO_ITF_1(_itfnum, _ep_in, _ep_out, ...) TUD_BTH_ISO_ITF(_itfnum, (CFG_TUD_BTH_ISO_ALT_COUNT) - 1, _ep_in, _ep_out, _FIRST(__VA_ARGS__))
+#define TUD_BTH_ISO_ITF_2(_itfnum, _ep_in, _ep_out, ...) TUD_BTH_ISO_ITF(_itfnum, (CFG_TUD_BTH_ISO_ALT_COUNT) - 2, _ep_in, _ep_out, _FIRST(__VA_ARGS__)) \
+	TUD_BTH_ISO_ITF_1(_itfnum, _ep_in, _ep_out, _REST(__VA_ARGS__))
+#define TUD_BTH_ISO_ITF_3(_itfnum, _ep_in, _ep_out, ...) TUD_BTH_ISO_ITF(_itfnum, (CFG_TUD_BTH_ISO_ALT_COUNT) - 3, _ep_in, _ep_out, _FIRST(__VA_ARGS__)) \
+	TUD_BTH_ISO_ITF_2(_itfnum, _ep_in, _ep_out, _REST(__VA_ARGS__))
+#define TUD_BTH_ISO_ITF_4(_itfnum, _ep_in, _ep_out, ...) TUD_BTH_ISO_ITF(_itfnum, (CFG_TUD_BTH_ISO_ALT_COUNT) - 4, _ep_in, _ep_out, _FIRST(__VA_ARGS__)) \
+	TUD_BTH_ISO_ITF_3(_itfnum, _ep_in, _ep_out, _REST(__VA_ARGS__))
+#define TUD_BTH_ISO_ITF_5(_itfnum, _ep_in, _ep_out, ...) TUD_BTH_ISO_ITF(_itfnum, (CFG_TUD_BTH_ISO_ALT_COUNT) - 5, _ep_in, _ep_out, _FIRST(__VA_ARGS__)) \
+	TUD_BTH_ISO_ITF_4(_itfnum, _ep_in, _ep_out, _REST(__VA_ARGS__))
+#define TUD_BTH_ISO_ITF_6(_itfnum, _ep_in, _ep_out, ...) TUD_BTH_ISO_ITF(_itfnum, (CFG_TUD_BTH_ISO_ALT_COUNT) - 6, _ep_in, _ep_out, _FIRST(__VA_ARGS__)) \
+	TUD_BTH_ISO_ITF_5(_itfnum, _ep_in, _ep_out, _REST(__VA_ARGS__))
+
+#define TUD_BTH_ISO_ITFS(_itfnum, _ep_in, _ep_out, ...) \
+	TU_XSTRCAT(TUD_BTH_ISO_ITF_, CFG_TUD_BTH_ISO_ALT_COUNT)(_itfnum, _ep_in, _ep_out, __VA_ARGS__)
+
+// BT Primary controller descriptor
+// Interface number, string index, attributes, event endpoint, event endpoint size, interval, data in, data out, data endpoint size, iso endpoint sizes
+#define TUD_BTH_DESCRIPTOR(_itfnum, _stridx, _ep_evt, _ep_evt_size, _ep_evt_interval, _ep_in, _ep_out, _ep_size,...) \
+  TUD_BTH_PRI_ITF(_itfnum, _stridx, _ep_evt, _ep_evt_size, _ep_evt_interval, _ep_in, _ep_out, _ep_size) \
+  TUD_BTH_ISO_ITFS(_itfnum + 1, _ep_in + 1, _ep_out + 1, __VA_ARGS__)
 
 #ifdef __cplusplus
  }
diff --git a/src/tusb.h b/src/tusb.h
index 55c105121..defbc54fb 100644
--- a/src/tusb.h
+++ b/src/tusb.h
@@ -95,6 +95,10 @@
   #if CFG_TUD_NET
     #include "class/net/net_device.h"
   #endif
+
+  #if CFG_TUD_BTH
+    #include "class/bth/bth_device.h"
+  #endif
 #endif
 
 
diff --git a/src/tusb_option.h b/src/tusb_option.h
index 9e6a2b532..0a227483f 100644
--- a/src/tusb_option.h
+++ b/src/tusb_option.h
@@ -219,6 +219,10 @@
   #define CFG_TUD_NET             0
 #endif
 
+#ifndef CFG_TUD_BTH
+  #define CFG_TUD_BTH             0
+#endif
+
 //--------------------------------------------------------------------
 // HOST OPTIONS
 //--------------------------------------------------------------------