wf_control_get
wf_control_get(cpu_rear_fans[cpu], &sp->target);
wf_control_get(cpu_rear_fans[0], &sp->target);
err = wf_control_get(backside_fan, &speed);
err = wf_control_get(drives_fan, &speed);
wf_control_get(cpu_fans[cpu][0], &sp->target);
err = wf_control_get(backside_fan, &speed);