read_tcs_reg
enable = read_tcs_reg(drv, reg, tcs_id);
cmd_enable |= read_tcs_reg(drv, drv->regs[RSC_DRV_CMD_ENABLE], tcs_id);
curr_enabled = read_tcs_reg(drv, drv->regs[RSC_DRV_CMD_ENABLE], i);