fcu_fanrpm_sysctl
static int fcu_fanrpm_sysctl(SYSCTL_HANDLER_ARGS);
dev, i, fcu_fanrpm_sysctl, "I", "Fan RPM");
dev, FCU_PWM_SYSCTL_PWM | i, fcu_fanrpm_sysctl, "I",
dev, FCU_PWM_SYSCTL_RPM | i, fcu_fanrpm_sysctl, "I",