static void pm121_tick()

in windfarm_pm121.c [786:864]

• 49 lines of code
• 19 McCabe index (conditional complexity)

static void pm121_tick(void)
{
	unsigned int last_failure = pm121_failure_state;
	unsigned int new_failure;
	s32 total_power;
	int i;

	if (!pm121_started) {
		pr_debug("pm121: creating control loops !\n");
		for (i = 0; i < N_LOOPS; i++)
			pm121_create_sys_fans(i);

		pm121_create_cpu_fans();
		pm121_started = true;
	}

	/* skipping ticks */
	if (pm121_skipping && --pm121_skipping)
		return;

	/* compute average power */
	total_power = 0;
	for (i = 0; i < pm121_cpu_state->pid.param.history_len; i++)
		total_power += pm121_cpu_state->pid.powers[i];

	average_power = total_power / pm121_cpu_state->pid.param.history_len;


	pm121_failure_state = 0;
	for (i = 0 ; i < N_LOOPS; i++) {
		if (pm121_sys_state[i])
			pm121_sys_fans_tick(i);
	}

	if (pm121_cpu_state)
		pm121_cpu_fans_tick(pm121_cpu_state);

	pm121_readjust = 0;
	new_failure = pm121_failure_state & ~last_failure;

	/* If entering failure mode, clamp cpufreq and ramp all
	 * fans to full speed.
	 */
	if (pm121_failure_state && !last_failure) {
		for (i = 0; i < N_CONTROLS; i++) {
			if (controls[i])
				wf_control_set_max(controls[i]);
		}
	}

	/* If leaving failure mode, unclamp cpufreq and readjust
	 * all fans on next iteration
	 */
	if (!pm121_failure_state && last_failure) {
		if (controls[CPUFREQ])
			wf_control_set_min(controls[CPUFREQ]);
		pm121_readjust = 1;
	}

	/* Overtemp condition detected, notify and start skipping a couple
	 * ticks to let the temperature go down
	 */
	if (new_failure & FAILURE_OVERTEMP) {
		wf_set_overtemp();
		pm121_skipping = 2;
		pm121_overtemp = true;
	}

	/* We only clear the overtemp condition if overtemp is cleared
	 * _and_ no other failure is present. Since a sensor error will
	 * clear the overtemp condition (can't measure temperature) at
	 * the control loop levels, but we don't want to keep it clear
	 * here in this case
	 */
	if (!pm121_failure_state && pm121_overtemp) {
		wf_clear_overtemp();
		pm121_overtemp = false;
	}
}