Merge pull request #3032 from rppicomidi/fix_3031

Fix 3031: implement tuh_midi_itf_get_info()

Author: hathach

src/class/midi/midi_host.c

@@ -56,6 +56,7 @@ TU_ATTR_WEAK void tuh_midi_tx_cb(uint8_t idx, uint32_t xferred_bytes) { (void) i
 typedef struct {
   uint8_t daddr;
   uint8_t bInterfaceNumber; // interface number of MIDI streaming
+  uint8_t iInterface;
   uint8_t itf_count;        // number of interface including Audio Control + MIDI streaming
 
   uint8_t ep_in;          // IN endpoint address
@@ -228,6 +229,7 @@ bool midih_open(uint8_t rhport, uint8_t dev_addr, tusb_desc_interface_t const *d
 
   TU_LOG_DRV("MIDI opening Interface %u (addr = %u)\r\n", desc_itf->bInterfaceNumber, dev_addr);
   p_midi->bInterfaceNumber = desc_itf->bInterfaceNumber;
+  p_midi->iInterface = desc_itf->iInterface;
   p_midi->itf_count++;
   desc_cb.desc_midi = desc_itf;
 
@@ -346,6 +348,28 @@ uint8_t tuh_midi_itf_get_index(uint8_t daddr, uint8_t itf_num) {
   return TUSB_INDEX_INVALID_8;
 }
 
+bool tuh_midi_itf_get_info(uint8_t idx, tuh_itf_info_t* info) {
+  midih_interface_t* p_midi = &_midi_host[idx];
+  TU_VERIFY(p_midi && info);
+
+  info->daddr = p_midi->daddr;
+
+  // re-construct descriptor
+  tusb_desc_interface_t* desc = &info->desc;
+  desc->bLength            = sizeof(tusb_desc_interface_t);
+  desc->bDescriptorType    = TUSB_DESC_INTERFACE;
+
+  desc->bInterfaceNumber   = p_midi->bInterfaceNumber;
+  desc->bAlternateSetting  = 0;
+  desc->bNumEndpoints      = (uint8_t)((p_midi->ep_in != 0 ? 1:0) + (p_midi->ep_out != 0 ? 1:0));
+  desc->bInterfaceClass    = TUSB_CLASS_AUDIO;
+  desc->bInterfaceSubClass = AUDIO_SUBCLASS_MIDI_STREAMING;
+  desc->bInterfaceProtocol = 0;
+  desc->iInterface         = p_midi->iInterface;
+
+  return true;
+}
+
 uint8_t tuh_midi_get_tx_cable_count (uint8_t idx) {
   TU_VERIFY(idx < CFG_TUH_MIDI);
   midih_interface_t *p_midi = &_midi_host[idx];

src/class/midi/midi_host.h

@@ -90,6 +90,10 @@ bool tuh_midi_mounted(uint8_t idx);
 // return TUSB_INDEX_INVALID_8 (0xFF) if not found
 uint8_t tuh_midi_itf_get_index(uint8_t daddr, uint8_t itf_num);
 
+// Get Interface information
+// return true if index is correct and interface is currently mounted
+bool tuh_midi_itf_get_info(uint8_t idx, tuh_itf_info_t* info);
+
 // return the number of virtual midi cables on the device's IN endpoint
 uint8_t tuh_midi_get_rx_cable_count(uint8_t idx);