This function indicates to the serial port driver that the platform is about to go into suspend mode.
BOOL COM_PowerDown( HANDLE pContext );
Zero indicates success. A value of 1 indicates failure.
This function is exported to users. As with all power-down handlers, this function cannot call functions in other DLLs, memory allocators, debugging-output functions, or do anything that could cause a page fault.
This function is defined in the Mdd.c file.