1 2 3 Supporting multiple CPU idle levels in kernel 4 5 cpuidle drivers 6 7 8 9 10cpuidle driver hooks into the cpuidle infrastructure and handles the 11architecture/platform dependent part of CPU idle states. Driver 12provides the platform idle state detection capability and also 13has mechanisms in place to support actual entry-exit into CPU idle states. 14 15cpuidle driver initializes the cpuidle_device structure for each CPU device 16and registers with cpuidle using cpuidle_register_device. 17 18If all the idle states are the same, the wrapper function cpuidle_register 19could be used instead. 20 21It can also support the dynamic changes (like battery <-> AC), by using 22cpuidle_pause_and_lock, cpuidle_disable_device and cpuidle_enable_device, 23cpuidle_resume_and_unlock. 24 25Interfaces: 26extern int cpuidle_register(struct cpuidle_driver *drv, 27 const struct cpumask *const coupled_cpus); 28extern int cpuidle_unregister(struct cpuidle_driver *drv); 29extern int cpuidle_register_driver(struct cpuidle_driver *drv); 30extern void cpuidle_unregister_driver(struct cpuidle_driver *drv); 31extern int cpuidle_register_device(struct cpuidle_device *dev); 32extern void cpuidle_unregister_device(struct cpuidle_device *dev); 33 34extern void cpuidle_pause_and_lock(void); 35extern void cpuidle_resume_and_unlock(void); 36extern int cpuidle_enable_device(struct cpuidle_device *dev); 37extern void cpuidle_disable_device(struct cpuidle_device *dev); 38