add tuh_midi_descriptor_cb()

src/class/audio/audio.h

@@ -661,6 +661,7 @@ typedef struct TU_ATTR_PACKED
   uint16_t wTotalLength      ; ///< Total number of bytes returned for the class-specific AudioControl interface descriptor. Includes the combined length of this descriptor header and all Clock Source, Unit and Terminal descriptors.
   uint8_t bmControls         ; ///< See: audio_cs_ac_interface_control_pos_t.
 } audio_desc_cs_ac_interface_t;
+TU_VERIFY_STATIC(sizeof(audio_desc_cs_ac_interface_t) == 9, "size is not correct");
 
 /// AUDIO Clock Source Descriptor (4.7.2.1)
 typedef struct TU_ATTR_PACKED

src/class/midi/midi.h

@@ -150,27 +150,6 @@ typedef midi_desc_out_jack_n_t(1)  midi_desc_out_jack_1in_t; // 1 input
 typedef midi_desc_out_jack_1in_t midi_desc_out_jack_t; // backward compatible
 TU_VERIFY_STATIC(sizeof(midi_desc_out_jack_1in_t) == 7 + 2 * 1, "size is not correct");
 
-/// MIDI Element Descriptor
-typedef struct TU_ATTR_PACKED {
-  uint8_t bLength            ; ///< Size of this descriptor in bytes.
-  uint8_t bDescriptorType    ; ///< Descriptor Type, must be Class-Specific
-  uint8_t bDescriptorSubType ; ///< Descriptor SubType
-  uint8_t bElementID;
-
-  uint8_t bNrInputPins;
-  uint8_t baSourceID;
-  uint8_t baSourcePin;
-
-  uint8_t bNrOutputPins;
-  uint8_t bInTerminalLink;
-  uint8_t bOutTerminalLink;
-  uint8_t bElCapsSize;
-
-  uint16_t bmElementCaps;
-  uint8_t  iElement;
-} midi_desc_element_t;
-TU_VERIFY_STATIC(sizeof(midi_desc_element_t) == 14, "size is not correct");
-
 /// MIDI Element Descriptor with multiple pins
 #define midi_desc_element_n_t(input_num) \
   struct TU_ATTR_PACKED {       \

src/class/midi/midi_host.c

@@ -194,123 +194,110 @@ bool midih_open(uint8_t rhport, uint8_t dev_addr, tusb_desc_interface_t const *d
 
   midih_interface_t *p_midi = find_new_midi();
   TU_VERIFY(p_midi != NULL);
-
   TU_VERIFY(TUSB_CLASS_AUDIO == desc_itf->bInterfaceClass);
-  // There can be just a MIDI interface or an audio and a MIDI interface. Only open the MIDI interface
+
+  // There can be just a MIDI or an Audio + MIDI interface
+  // const uint8_t* p_start = ((uint8_t const*) desc_itf);
+  const uint8_t* p_end = ((uint8_t const*) desc_itf) + max_len;
   uint8_t const *p_desc = (uint8_t const *) desc_itf;
   uint16_t len_parsed = 0;
+
+  tuh_midi_descriptor_cb_t desc_cb = { 0 };
+  desc_cb.jack_num = 0;
+
+  // If there is Audio Control Interface + Audio Header descriptor, skip it
   if (AUDIO_SUBCLASS_CONTROL == desc_itf->bInterfaceSubClass) {
-    // This driver does not support audio streaming. However, if this is the audio control interface
-    // there might be a MIDI interface following it. Search through every descriptor until a MIDI
-    // interface is found or the end of the descriptor is found
-    while (len_parsed < max_len &&
-          (desc_itf->bInterfaceClass != TUSB_CLASS_AUDIO || desc_itf->bInterfaceSubClass != AUDIO_SUBCLASS_MIDI_STREAMING)) {
-      len_parsed += desc_itf->bLength;
-      p_desc = tu_desc_next(p_desc);
-      desc_itf = (tusb_desc_interface_t const *)p_desc;
-    }
+    TU_VERIFY(max_len > 2*sizeof(tusb_desc_interface_t) + sizeof(audio_desc_cs_ac_interface_t));
 
+    p_desc = tu_desc_next(p_desc);
+    TU_VERIFY(tu_desc_type(p_desc) == TUSB_DESC_CS_INTERFACE &&
+              tu_desc_subtype(p_desc) == AUDIO_CS_AC_INTERFACE_HEADER);
+
+    p_desc = tu_desc_next(p_desc);
+    desc_itf = (tusb_desc_interface_t const *)p_desc;
     TU_VERIFY(TUSB_CLASS_AUDIO == desc_itf->bInterfaceClass);
   }
   TU_VERIFY(AUDIO_SUBCLASS_MIDI_STREAMING == desc_itf->bInterfaceSubClass);
+  desc_cb.desc_interface = desc_itf;
+
   len_parsed += desc_itf->bLength;
 
   TU_LOG_DRV("MIDI opening Interface %u (addr = %u)\r\n", desc_itf->bInterfaceNumber, dev_addr);
   p_midi->itf_num = desc_itf->bInterfaceNumber;
-
-  // CS Header descriptor
   p_desc = tu_desc_next(p_desc);
-  midi_desc_header_t const *p_mdh = (midi_desc_header_t const *) p_desc;
-  TU_VERIFY(p_mdh->bDescriptorType == TUSB_DESC_CS_INTERFACE &&
-            p_mdh->bDescriptorSubType == MIDI_CS_INTERFACE_HEADER);
-  TU_LOG_DRV("  Interface Header descriptor\r\n");
-
-  // p_desc = tu_desc_next(p_desc);
-  uint8_t prev_ep_addr = 0; // the CS endpoint descriptor is associated with the previous endpoint descriptor
-  tusb_desc_endpoint_t const* in_desc = NULL;
-  tusb_desc_endpoint_t const* out_desc = NULL;
-  while (len_parsed < max_len) {
-    TU_VERIFY((p_mdh->bDescriptorType == TUSB_DESC_CS_INTERFACE) ||
-              (p_mdh->bDescriptorType == TUSB_DESC_CS_ENDPOINT && p_mdh->bDescriptorSubType == MIDI_CS_ENDPOINT_GENERAL) ||
-              p_mdh->bDescriptorType == TUSB_DESC_ENDPOINT);
-
-    if (p_mdh->bDescriptorType == TUSB_DESC_CS_INTERFACE) {
-      // The USB host doesn't really need this information unless it uses
-      // the string descriptor for a jack or Element
-
-      // assume it is an input jack
-      midi_desc_in_jack_t const *p_mdij = (midi_desc_in_jack_t const *) p_desc;
-      if (p_mdij->bDescriptorSubType == MIDI_CS_INTERFACE_HEADER) {
-        TU_LOG_DRV("  Interface Header descriptor\r\n");
-      } else if (p_mdij->bDescriptorSubType == MIDI_CS_INTERFACE_IN_JACK) {
-        // Then it is an in jack.
-        TU_LOG_DRV("  IN Jack %s descriptor \r\n", p_mdij->bJackType == MIDI_JACK_EXTERNAL ? "External" : "Embedded");
-      } else if (p_mdij->bDescriptorSubType == MIDI_CS_INTERFACE_OUT_JACK) {
-        // then it is an out jack
-        TU_LOG_DRV("  OUT Jack %s descriptor\r\n", p_mdij->bJackType == MIDI_JACK_EXTERNAL ? "External" : "Embedded");
-      } else if (p_mdij->bDescriptorSubType == MIDI_CS_INTERFACE_ELEMENT) {
-        // the it is an element;
-        TU_LOG_DRV("Found element\r\n");
-      } else {
-        TU_LOG_DRV("  Unknown CS Interface sub-type %u\r\n", p_mdij->bDescriptorSubType);
-        TU_VERIFY(false);// unknown CS Interface sub-type
-      }
-      len_parsed += p_mdij->bLength;
-    } else if (p_mdh->bDescriptorType == TUSB_DESC_CS_ENDPOINT) {
-      TU_LOG_DRV("  CS_ENDPOINT descriptor\r\n");
-      TU_VERIFY(prev_ep_addr != 0);
-      // parse out the mapping between the device's embedded jacks and the endpoints
-      // Each embedded IN jack is associated with an OUT endpoint
-      midi_desc_cs_endpoint_t const *p_csep = (midi_desc_cs_endpoint_t const *) p_mdh;
-      if (tu_edpt_dir(prev_ep_addr) == TUSB_DIR_OUT) {
-        TU_VERIFY(p_midi->ep_out == prev_ep_addr);
-        TU_VERIFY(p_midi->num_cables_tx == 0);
-        p_midi->num_cables_tx = p_csep->bNumEmbMIDIJack;
-      } else {
-        TU_VERIFY(p_midi->ep_in == prev_ep_addr);
-        TU_VERIFY(p_midi->num_cables_rx == 0);
-        p_midi->num_cables_rx = p_csep->bNumEmbMIDIJack;
-      }
-      len_parsed += p_csep->bLength;
-      prev_ep_addr = 0;
-    } else if (p_mdh->bDescriptorType == TUSB_DESC_ENDPOINT) {
-      // parse out the bulk endpoint info
-      tusb_desc_endpoint_t const *p_ep = (tusb_desc_endpoint_t const *) p_mdh;
-      TU_LOG_DRV("  Endpoint descriptor %02x\r\n", p_ep->bEndpointAddress);
-      if (tu_edpt_dir(p_ep->bEndpointAddress) == TUSB_DIR_OUT) {
-        TU_VERIFY(p_midi->ep_out == 0);
-        TU_VERIFY(p_midi->num_cables_tx == 0);
-        p_midi->ep_out = p_ep->bEndpointAddress;
-        prev_ep_addr = p_midi->ep_out;
-        out_desc = p_ep;
-      } else {
-        TU_VERIFY(p_midi->ep_in == 0);
-        TU_VERIFY(p_midi->num_cables_rx == 0);
-        p_midi->ep_in = p_ep->bEndpointAddress;
-        prev_ep_addr = p_midi->ep_in;
-        in_desc = p_ep;
+
+  bool found_new_interface = false;
+  while ((p_desc < p_end) && (tu_desc_next(p_desc) <= p_end) && !found_new_interface) {
+    switch (tu_desc_type(p_desc)) {
+      case TUSB_DESC_INTERFACE:
+        found_new_interface = true;
+        break;
+
+      case TUSB_DESC_CS_INTERFACE:
+        switch (tu_desc_subtype(p_desc)) {
+          case MIDI_CS_INTERFACE_HEADER:
+            TU_LOG_DRV("  Interface Header descriptor\r\n");
+            desc_cb.desc_header = p_desc;
+            break;
+
+          case MIDI_CS_INTERFACE_IN_JACK:
+          case MIDI_CS_INTERFACE_OUT_JACK: {
+            // jack in and out share same layout up to the bJackID field
+            midi_desc_in_jack_t const *p_jack = (midi_desc_in_jack_t const *) p_desc;
+            TU_LOG_DRV("  Jack %s %s descriptor \r\n",
+                       p_jack->bDescriptorSubType == MIDI_CS_INTERFACE_IN_JACK ? "IN" : "OUT",
+                       p_jack->bJackType == MIDI_JACK_EXTERNAL ? "External" : "Embedded");
+            desc_cb.desc_jack[desc_cb.jack_num++] = p_desc;
+            break;
+          }
+
+          case MIDI_CS_INTERFACE_ELEMENT:
+            TU_LOG_DRV("  Element descriptor\r\n");
+            desc_cb.desc_element = p_desc;
+            break;
+
+          default:
+            TU_LOG_DRV("  Unknown CS Interface sub-type %u\r\n", tu_desc_subtype(p_desc));
+            break;
+        }
+        break;
+
+      case TUSB_DESC_ENDPOINT: {
+        tusb_desc_endpoint_t const *p_ep = (tusb_desc_endpoint_t const *) p_desc;
+        p_desc = tu_desc_next(p_desc); // next to CS endpoint
+        TU_VERIFY(p_desc < p_end && tu_desc_next(p_desc) <= p_end);
+        midi_desc_cs_endpoint_t const *p_csep = (midi_desc_cs_endpoint_t const *) p_desc;
+
+        TU_LOG_DRV("  Endpoint and CS_Endpoint descriptor %02x\r\n", p_ep->bEndpointAddress);
+        if (tu_edpt_dir(p_ep->bEndpointAddress) == TUSB_DIR_OUT) {
+          p_midi->ep_out = p_ep->bEndpointAddress;
+          p_midi->num_cables_tx = p_csep->bNumEmbMIDIJack;
+          desc_cb.desc_epout = p_ep;
+
+          TU_ASSERT(tuh_edpt_open(dev_addr, p_ep));
+          tu_edpt_stream_open(&p_midi->ep_stream.tx, p_ep);
+        } else {
+          p_midi->ep_in = p_ep->bEndpointAddress;
+          p_midi->num_cables_rx = p_csep->bNumEmbMIDIJack;
+          desc_cb.desc_epin = p_ep;
+
+          TU_ASSERT(tuh_edpt_open(dev_addr, p_ep));
+          tu_edpt_stream_open(&p_midi->ep_stream.rx, p_ep);
+        }
+        break;
       }
-      len_parsed += p_mdh->bLength;
+
+      default: break; // skip unknown descriptor
     }
     p_desc = tu_desc_next(p_desc);
-    p_mdh = (midi_desc_header_t const *) p_desc;
   }
-  TU_VERIFY((p_midi->ep_out != 0 && p_midi->num_cables_tx != 0) ||
-            (p_midi->ep_in != 0 && p_midi->num_cables_rx != 0));
+  desc_cb.desc_interface_len = (uint16_t) ((uintptr_t)p_desc - (uintptr_t) desc_itf);
 
-  if (in_desc) {
-    TU_ASSERT(tuh_edpt_open(dev_addr, in_desc));
-    tu_edpt_stream_open(&p_midi->ep_stream.rx, in_desc);
-  }
-  if (out_desc) {
-    TU_ASSERT(tuh_edpt_open(dev_addr, out_desc));
-    tu_edpt_stream_open(&p_midi->ep_stream.tx, out_desc);
-  }
   p_midi->dev_addr = dev_addr;
 
-  // if (tuh_midi_interface_descriptor_cb) {
-  //   tuh_midi_interface_descriptor_cb(dev_addr, desc_itf, );
-  // }
+  if (tuh_midi_descriptor_cb) {
+    tuh_midi_descriptor_cb(dev_addr, &desc_cb);
+  }
 
   return true;
 }

src/class/midi/midi_host.h

@@ -63,6 +63,19 @@
 // Application API
 //--------------------------------------------------------------------+
 
+typedef struct {
+  const tusb_desc_interface_t* desc_interface; // start of whole midi interface descriptor
+  uint16_t desc_interface_len;
+
+  const uint8_t* desc_header;
+  const uint8_t* desc_element;
+  const tusb_desc_endpoint_t* desc_epin;  // endpoint IN descriptor, CS_ENDPOINT is right after
+  const tusb_desc_endpoint_t* desc_epout; // endpoint OUT descriptor, CS_ENDPOINT is right after
+
+  uint8_t jack_num;
+  const uint8_t* desc_jack[16]; // list of jack descriptors (embedded + external)
+} tuh_midi_descriptor_cb_t;
+
 // Check if MIDI interface is mounted
 bool tuh_midi_mounted(uint8_t dev_addr);
 
@@ -134,7 +147,7 @@ uint32_t tuh_midi_stream_read (uint8_t dev_addr, uint8_t *p_cable_num, uint8_t *
 
 // Invoked when MIDI interface is detected in enumeration. Application can copy/parse descriptor if needed.
 // Note: may be fired before tuh_midi_mount_cb(), therefore midi interface is not mounted/ready.
-// TU_ATTR_WEAK void tuh_midi_interface_descriptor_cb(uint8_t dev_addr, const uint8_t* desc_itf, uint16_t desc_len);
+TU_ATTR_WEAK void tuh_midi_descriptor_cb(uint8_t dev_addr, tuh_midi_descriptor_cb_t const* desc_cb);
 
 // Invoked when device with MIDI interface is mounted.
 TU_ATTR_WEAK void tuh_midi_mount_cb(uint8_t dev_addr, uint8_t num_cables_rx, uint16_t num_cables_tx);

src/common/tusb_types.h

@@ -281,7 +281,8 @@ typedef enum {
 // TODO remove
 enum {
   DESC_OFFSET_LEN  = 0,
-  DESC_OFFSET_TYPE = 1
+  DESC_OFFSET_TYPE = 1,
+  DESC_OFFSET_SUBTYPE = 2
 };
 
 enum {
@@ -570,16 +571,23 @@ TU_ATTR_ALWAYS_INLINE static inline uint8_t const * tu_desc_next(void const* des
   return desc8 + desc8[DESC_OFFSET_LEN];
 }
 
+// get descriptor length
+TU_ATTR_ALWAYS_INLINE static inline uint8_t tu_desc_len(void const* desc) {
+  return ((uint8_t const*) desc)[DESC_OFFSET_LEN];
+}
+
 // get descriptor type
 TU_ATTR_ALWAYS_INLINE static inline uint8_t tu_desc_type(void const* desc) {
   return ((uint8_t const*) desc)[DESC_OFFSET_TYPE];
 }
 
-// get descriptor length
-TU_ATTR_ALWAYS_INLINE static inline uint8_t tu_desc_len(void const* desc) {
-  return ((uint8_t const*) desc)[DESC_OFFSET_LEN];
+// get descriptor subtype
+TU_ATTR_ALWAYS_INLINE static inline uint8_t tu_desc_subtype(void const* desc) {
+  return ((uint8_t const*) desc)[DESC_OFFSET_SUBTYPE];
 }
 
+
+
 // find descriptor that match byte1 (type)
 uint8_t const * tu_desc_find(uint8_t const* desc, uint8_t const* end, uint8_t byte1);
 

src/tusb.c

@@ -142,23 +142,29 @@ void tusb_int_handler(uint8_t rhport, bool in_isr) {
 
 uint8_t const* tu_desc_find(uint8_t const* desc, uint8_t const* end, uint8_t byte1) {
   while (desc + 1 < end) {
-    if (desc[1] == byte1) return desc;
+    if (desc[1] == byte1) {
+      return desc;
+    }
     desc += desc[DESC_OFFSET_LEN];
   }
   return NULL;
 }
 
 uint8_t const* tu_desc_find2(uint8_t const* desc, uint8_t const* end, uint8_t byte1, uint8_t byte2) {
   while (desc + 2 < end) {
-    if (desc[1] == byte1 && desc[2] == byte2) return desc;
+    if (desc[1] == byte1 && desc[2] == byte2) {
+      return desc;
+    }
     desc += desc[DESC_OFFSET_LEN];
   }
   return NULL;
 }
 
 uint8_t const* tu_desc_find3(uint8_t const* desc, uint8_t const* end, uint8_t byte1, uint8_t byte2, uint8_t byte3) {
   while (desc + 3 < end) {
-    if (desc[1] == byte1 && desc[2] == byte2 && desc[3] == byte3) return desc;
+    if (desc[1] == byte1 && desc[2] == byte2 && desc[3] == byte3) {
+      return desc;
+    }
     desc += desc[DESC_OFFSET_LEN];
   }
   return NULL;