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Commit | Line | Data |
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fe8e288a VP |
1 | |
2 | ||
3 | Supporting multiple CPU idle levels in kernel | |
4 | ||
5 | cpuidle drivers | |
6 | ||
7 | ||
8 | ||
9 | ||
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. | |
14 | ||
15 | cpuidle driver initializes the cpuidle_device structure for each CPU device | |
16 | and registers with cpuidle using cpuidle_register_device. | |
17 | ||
4c637b21 DL |
18 | If all the idle states are the same, the wrapper function cpuidle_register |
19 | could be used instead. | |
20 | ||
fe8e288a VP |
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. | |
24 | ||
25 | Interfaces: | |
4c637b21 DL |
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); | |
fe8e288a VP |
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); | |
33 | ||
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); |