Add a usb_read_ok_timeout wrapper to cope with slow init'ing devices.
diff --git a/usbutils.h b/usbutils.h
index 8b132b9..d4e04bf 100644
--- a/usbutils.h
+++ b/usbutils.h
@@ -287,6 +287,9 @@ void *usb_resource_thread(void *userdata);
#define usb_read_ok(cgpu, buf, bufsiz, read, cmd) \
_usb_read(cgpu, DEFAULT_EP_IN, buf, bufsiz, read, DEVTIMEOUT, "OK\n", cmd, false)
+#define usb_read_ok_timeout(cgpu, buf, bufsiz, read, timeout, cmd) \
+ _usb_read(cgpu, DEFAULT_EP_IN, buf, bufsiz, read, timeout, "OK\n", cmd, false)
+
#define usb_read_ep(cgpu, ep, buf, bufsiz, read, cmd) \
_usb_read(cgpu, ep, buf, bufsiz, read, DEVTIMEOUT, NULL, cmd, false)