How to Add Power Management to a Device Driver
A version of this page is also available for
4/8/2010
You can add support for power management to a device driver to reduce power consumption on a device. To do this, your driver must expose the stream interface. Once you have implemented the stream interface, you can add support for power management to your driver.
Hardware and Software Assumptions
- These steps assume that you are familiar with building a Platform Builder run-time image from the command line.**
Track your progress in the following table.
| Step | Description |
|---|---|
1. Create a stream interface device driver. |
The stream interface functions enable other software modules to interact with peripherals as if they were files. |
2. Add support for the power management I/O control codes (IOCTLs) to your stream interface driver. |
For more information see Power-Manageable Device Drivers. For more information about the power management IOCTLs, see Power Management I/O Controls. |
3. Notify Power Manager that your driver has power management. |
For more information about the power management functions, see Power Management Functions. |
4. Implement device power states in your driver. |
For more information on device power states, see Device Power States.and Power Management Implementation in Drivers. |
5. Build your driver. |
If you can build your driver with no errors, you have successfully added power management to your stream interface driver. |
6. Debug your driver. |
Correct any errors that arise in step 5. |
See Also
Concepts
Device Power States
Device Power Capabilities
IOCTL_POWER_SET Request Processing