Display stats regarding locking delays in API.

api.c

@@ -3096,6 +3096,7 @@ static int itemstats(struct io_data *io_data, int i, char *id, struct cgminer_st
 	if (cgpu) {
 #ifdef USE_USBUTILS
 		char details[256];
+		int val;
 
 		if (cgpu->usbinfo.pipe_count)
 			snprintf(details, sizeof(details),
@@ -3148,6 +3149,14 @@ static int itemstats(struct io_data *io_data, int i, char *id, struct cgminer_st
 		}
 
 		root = api_add_string(root, "USB tmo", details, true);
+		root = api_add_int(root, "USB bulk reads", &cgpu->usb_bulk_reads, false);
+		val = cgpu->usb_rlock_total_wait / (cgpu->usb_bulk_reads ? : 1);
+		root = api_add_int(root, "USB avg rlock ms wait", &val, true);
+		root = api_add_int(root, "USB max rlock ms wait", &cgpu->usb_rlock_max_wait, false);
+		root = api_add_int(root, "USB bulk writes", &cgpu->usb_bulk_writes, false);
+		val = cgpu->usb_wlock_total_wait / (cgpu->usb_bulk_writes ? : 1);
+		root = api_add_int(root, "USB avg wlock ms wait", &val, true);
+		root = api_add_int(root, "USB max wlock ms wait", &cgpu->usb_wlock_max_wait, false);
 #endif
 	}