add class driver deinit

src/class/cdc/cdc_device.c

@@ -253,11 +253,39 @@ void cdcd_init(void)
     // In this way, the most current data is prioritized.
     tu_fifo_config(&p_cdc->tx_ff, p_cdc->tx_ff_buf, TU_ARRAY_SIZE(p_cdc->tx_ff_buf), 1, true);
 
-    tu_fifo_config_mutex(&p_cdc->rx_ff, NULL, osal_mutex_create(&p_cdc->rx_ff_mutex));
-    tu_fifo_config_mutex(&p_cdc->tx_ff, osal_mutex_create(&p_cdc->tx_ff_mutex), NULL);
+    #if OSAL_MUTEX_REQUIRED
+    osal_mutex_t mutex_rd = osal_mutex_create(&p_cdc->rx_ff_mutex);
+    osal_mutex_t mutex_wr = osal_mutex_create(&p_cdc->tx_ff_mutex);
+    TU_ASSERT(mutex_rd != NULL && mutex_wr != NULL, );
+
+    tu_fifo_config_mutex(&p_cdc->rx_ff, NULL, mutex_rd);
+    tu_fifo_config_mutex(&p_cdc->tx_ff, mutex_wr, NULL);
+    #endif
   }
 }
 
+bool cdcd_deinit(void) {
+  #if OSAL_MUTEX_REQUIRED
+  for(uint8_t i=0; i<CFG_TUD_CDC; i++) {
+    cdcd_interface_t* p_cdc = &_cdcd_itf[i];
+    osal_mutex_t mutex_rd = p_cdc->rx_ff.mutex_rd;
+    osal_mutex_t mutex_wr = p_cdc->tx_ff.mutex_wr;
+
+    if (mutex_rd) {
+      osal_mutex_delete(mutex_rd);
+      tu_fifo_config_mutex(&p_cdc->rx_ff, NULL, NULL);
+    }
+
+    if (mutex_wr) {
+      osal_mutex_delete(mutex_wr);
+      tu_fifo_config_mutex(&p_cdc->tx_ff, NULL, NULL);
+    }
+  }
+  #endif
+
+  return true;
+}
+
 void cdcd_reset(uint8_t rhport)
 {
   (void) rhport;

src/class/cdc/cdc_device.h

@@ -247,6 +247,7 @@ static inline bool tud_cdc_write_clear(void)
 // INTERNAL USBD-CLASS DRIVER API
 //--------------------------------------------------------------------+
 void     cdcd_init            (void);
+bool     cdcd_deinit          (void);
 void     cdcd_reset           (uint8_t rhport);
 uint16_t cdcd_open            (uint8_t rhport, tusb_desc_interface_t const * itf_desc, uint16_t max_len);
 bool     cdcd_control_xfer_cb (uint8_t rhport, uint8_t stage, tusb_control_request_t const * request);