Add include/hardware/bt_hh::bthh_connection_state_text am: d2968e6a

  BTHH_CONN_STATE_UNKNOWN

} bthh_connection_state_t;

#define CASE_RETURN_TEXT(code) \

  case code:                   \

    return #code

static inline std::string bthh_connection_state_text(

    const bthh_connection_state_t& state) {

  switch (state) {

    CASE_RETURN_TEXT(BTHH_CONN_STATE_CONNECTED);

    CASE_RETURN_TEXT(BTHH_CONN_STATE_CONNECTING);

    CASE_RETURN_TEXT(BTHH_CONN_STATE_DISCONNECTED);

    CASE_RETURN_TEXT(BTHH_CONN_STATE_DISCONNECTING);

    CASE_RETURN_TEXT(BTHH_CONN_STATE_FAILED_MOUSE_FROM_HOST);

    CASE_RETURN_TEXT(BTHH_CONN_STATE_FAILED_KBD_FROM_HOST);

    CASE_RETURN_TEXT(BTHH_CONN_STATE_FAILED_TOO_MANY_DEVICES);

    CASE_RETURN_TEXT(BTHH_CONN_STATE_FAILED_NO_BTHID_DRIVER);

    CASE_RETURN_TEXT(BTHH_CONN_STATE_FAILED_GENERIC);

    CASE_RETURN_TEXT(BTHH_CONN_STATE_UNKNOWN);

    default:

      return std::string("UNKNOWN[%u]", state);

  }

}

#undef CASE_RETURN_TEXT

typedef enum {

  BTHH_OK = 0,

  BTHH_HS_HID_NOT_READY,  /* handshake error : device not ready */