static void wf_smu_sys_fans_tick()

in windfarm_pm81.c [328:391]

• 53 lines of code
• 14 McCabe index (conditional complexity)

static void wf_smu_sys_fans_tick(struct wf_smu_sys_fans_state *st)
{
	s32 new_setpoint, temp, scaled, cputarget;
	int rc;

	if (--st->ticks != 0) {
		if (wf_smu_readjust)
			goto readjust;
		return;
	}
	st->ticks = WF_SMU_SYS_FANS_INTERVAL;

	rc = wf_sensor_get(sensor_hd_temp, &temp);
	if (rc) {
		printk(KERN_WARNING "windfarm: HD temp sensor error %d\n",
		       rc);
		wf_smu_failure_state |= FAILURE_SENSOR;
		return;
	}

	DBG("wf_smu: System Fans tick ! HD temp: %d.%03d\n",
	    FIX32TOPRINT(temp));

	if (temp > (st->pid.param.itarget + 0x50000))
		wf_smu_failure_state |= FAILURE_OVERTEMP;

	new_setpoint = wf_pid_run(&st->pid, temp);

	DBG("wf_smu: new_setpoint: %d RPM\n", (int)new_setpoint);

	scaled = ((((s64)new_setpoint) * (s64)st->scale0) >> 12) + st->offset0;

	DBG("wf_smu: scaled setpoint: %d RPM\n", (int)scaled);

	cputarget = wf_smu_cpu_fans ? wf_smu_cpu_fans->pid.target : 0;
	cputarget = ((((s64)cputarget) * (s64)st->scale1) >> 12) + st->offset1;
	scaled = max(scaled, cputarget);
	scaled = max(scaled, st->pid.param.min);
	scaled = min(scaled, st->pid.param.max);

	DBG("wf_smu: adjusted setpoint: %d RPM\n", (int)scaled);

	if (st->sys_setpoint == scaled && new_setpoint == st->hd_setpoint)
		return;
	st->sys_setpoint = scaled;
	st->hd_setpoint = new_setpoint;
 readjust:
	if (fan_system && wf_smu_failure_state == 0) {
		rc = wf_control_set(fan_system, st->sys_setpoint);
		if (rc) {
			printk(KERN_WARNING "windfarm: Sys fan error %d\n",
			       rc);
			wf_smu_failure_state |= FAILURE_FAN;
		}
	}
	if (fan_hd && wf_smu_failure_state == 0) {
		rc = wf_control_set(fan_hd, st->hd_setpoint);
		if (rc) {
			printk(KERN_WARNING "windfarm: HD fan error %d\n",
			       rc);
			wf_smu_failure_state |= FAILURE_FAN;
		}
	}
}