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Documentation / cpuidle / driver.txt

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Based on kernel version 4.3. Page generated on 2015-11-02 12:44 EST.

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