projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 02361418 ADK |
1 | CPU cooling APIs How To |
| 2 | =================================== | |
| 3 | ||
| 4 | Written by Amit Daniel Kachhap <amit.kachhap@linaro.org> | |
| 5 | ||
| 6 | Updated: 12 May 2012 | |
| 7 | ||
| 8 | Copyright (c) 2012 Samsung Electronics Co., Ltd(http://www.samsung.com) | |
| 9 | ||
| 10 | 0. Introduction | |
| 11 | ||
| 12 | The generic cpu cooling(freq clipping) provides registration/unregistration APIs | |
| 13 | to the caller. The binding of the cooling devices to the trip point is left for | |
| 14 | the user. The registration APIs returns the cooling device pointer. | |
| 15 | ||
| 16 | 1. cpu cooling APIs | |
| 17 | ||
| 18 | 1.1 cpufreq registration/unregistration APIs | |
| 19 | 1.1.1 struct thermal_cooling_device *cpufreq_cooling_register( | |
| 20 | struct cpumask *clip_cpus) | |
| 21 | ||
| 22 | This interface function registers the cpufreq cooling device with the name | |
| 23 | "thermal-cpufreq-%x". This api can support multiple instances of cpufreq | |
| 24 | cooling devices. | |
| 25 | ||
| 26 | clip_cpus: cpumask of cpus where the frequency constraints will happen. | |
| 27 | ||
| 28 | 1.1.2 void cpufreq_cooling_unregister(struct thermal_cooling_device *cdev) | |
| 29 | ||
| 30 | This interface function unregisters the "thermal-cpufreq-%x" cooling device. | |
| 31 | ||
| 32 | cdev: Cooling device pointer which has to be unregistered. |