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authorVenkatesh Pallipadi <venkatesh.pallipadi@intel.com>2008-02-14 00:16:13 -0500
committerLen Brown <len.brown@intel.com>2008-02-14 00:16:13 -0500
commitfe8e288a63f2f3c51c288500282d0eb5cd26a534 (patch)
treef2d0178448df4367ce3692e4b0a4ebb3f7dcbd4e /Documentation/cpuidle/driver.txt
parent4fcb2fcd4d0678b8ae103d257dcb28074cbfc7fa (diff)
cpuidle: Add Documentation
Documentation for cpuidle infrastructure. (resend) Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Reviewed-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Len Brown <len.brown@intel.com>
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+
+
+ Supporting multiple CPU idle levels in kernel
+
+ cpuidle drivers
+
+
+
+
+cpuidle driver hooks into the cpuidle infrastructure and handles the
+architecture/platform dependent part of CPU idle states. Driver
+provides the platform idle state detection capability and also
+has mechanisms in place to support actual entry-exit into CPU idle states.
+
+cpuidle driver initializes the cpuidle_device structure for each CPU device
+and registers with cpuidle using cpuidle_register_device.
+
+It can also support the dynamic changes (like battery <-> AC), by using
+cpuidle_pause_and_lock, cpuidle_disable_device and cpuidle_enable_device,
+cpuidle_resume_and_unlock.
+
+Interfaces:
+extern int cpuidle_register_driver(struct cpuidle_driver *drv);
+extern void cpuidle_unregister_driver(struct cpuidle_driver *drv);
+extern int cpuidle_register_device(struct cpuidle_device *dev);
+extern void cpuidle_unregister_device(struct cpuidle_device *dev);
+
+extern void cpuidle_pause_and_lock(void);
+extern void cpuidle_resume_and_unlock(void);
+extern int cpuidle_enable_device(struct cpuidle_device *dev);
+extern void cpuidle_disable_device(struct cpuidle_device *dev);

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