Driver interface functions to interface client function drivers

A computer system, comprising:

• a core driver stack configured to expose a set of serial communication protocol driver interfaces that include driver interface functions configured to interface with client function drivers that correspond to one or more client devices configured for data communication in accordance with the serial communication protocol;
• and
• a processing system to implement the core driver stack for input/output of computer instructions and data communication, the core driver stack further configured to receive a contract version identifier from a client function driver via an extension of the driver interface functions, the contract version identifier indicating a set of operation rules by which the client function driver interfaces with the core driver stack.

A hardware computer-readable storage memory comprising stored instructions that are executable and, responsive to execution of the instructions by a computing device, the computing device performs operations comprising to:

• expose a set of serial communication protocol driver interfaces that are exposed by a core driver stack, the serial communication protocol driver interfaces including driver interface functions configured to interface with client function drivers that correspond to one or more client devices configured for data communication in accordance with the serial communication protocol;
• and
• receive a contract version identifier from a client function driver via an extension of the driver interface functions, the contract version identifier indicating a set of operation rules by which the client function driver interfaces with the core driver stack.