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SRB_CHANGE_POWER_STATE

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The class driver sends this request to signal to the minidriver that it should reset its power state. pSrb->DeviceState specifies the new power state.

See HW_STREAM_REQUEST_BLOCK.

Return value

The minidriver should set one of the following as the status in the SRB:

Value Description
STATUS_SUCCESS Indicates successful completion of the command.
STATUS_NOT_IMPLEMENTED Indicates that the function is not supported by the minidriver.
STATUS_IO_DEVICE_ERROR Indicates that a hardware failure occurred and low power cannot be invoked.

Remarks

If the minidriver needs to save or restore device-specific data it should do so when processing an SRB_CHANGE_POWER_STATE request.

For more information about power states, see Power IRPs for Individual Devices.