static int tegra_governor_event_handler()

in tegra30-devfreq.c [729:780]

• 36 lines of code
• 7 McCabe index (conditional complexity)

static int tegra_governor_event_handler(struct devfreq *devfreq,
					unsigned int event, void *data)
{
	struct tegra_devfreq *tegra = dev_get_drvdata(devfreq->dev.parent);
	unsigned int *new_delay = data;
	int ret = 0;

	/*
	 * Couple devfreq-device with the governor early because it is
	 * needed at the moment of governor's start (used by ISR).
	 */
	tegra->devfreq = devfreq;

	switch (event) {
	case DEVFREQ_GOV_START:
		devfreq_monitor_start(devfreq);
		ret = tegra_actmon_start(tegra);
		break;

	case DEVFREQ_GOV_STOP:
		tegra_actmon_stop(tegra);
		devfreq_monitor_stop(devfreq);
		break;

	case DEVFREQ_GOV_UPDATE_INTERVAL:
		/*
		 * ACTMON hardware supports up to 256 milliseconds for the
		 * sampling period.
		 */
		if (*new_delay > 256) {
			ret = -EINVAL;
			break;
		}

		tegra_actmon_pause(tegra);
		devfreq_update_interval(devfreq, new_delay);
		ret = tegra_actmon_resume(tegra);
		break;

	case DEVFREQ_GOV_SUSPEND:
		tegra_actmon_stop(tegra);
		devfreq_monitor_suspend(devfreq);
		break;

	case DEVFREQ_GOV_RESUME:
		devfreq_monitor_resume(devfreq);
		ret = tegra_actmon_start(tegra);
		break;
	}

	return ret;
}