PAD_TRACE
PAD_TRACE(pad, "ctor");
PAD_TRACE(pad, "-> %s", (mode == NVKM_I2C_PAD_AUX) ? "aux" :
PAD_TRACE(pad, "mode %d", mode);
PAD_TRACE(pad, "release");
PAD_TRACE(pad, "acquire");
PAD_TRACE(pad, "fini");
PAD_TRACE(pad, "init");
PAD_TRACE(pad, "dtor");