TU_REG_CMD
if (tu->regs[TU_REG_CMD] >= TU_NUM_CMDS)
tu->regs[TU_REG_CMD] : 0;
switch (tu->regs[TU_REG_CMD]) {
dev_err(&tu->client->dev, "CMD%02X failed (%d)\n", tu->regs[TU_REG_CMD], ret);
tu->regs[TU_REG_CMD] == TU_CMD_SMBUS_BLOCK_PROC_CALL;
tu->regs[TU_REG_CMD] == TU_CMD_GET_VERSION_WITH_REP_START;