Identification of option cards using multiple voltage inputs

1 . A computing device comprising:

an option card receptacle to receive an option card;

a controller interconnected with the option card receptacle, the controller to:

apply a first voltage input to the option card in the option card receptacle and detect a first output value from the option card;

apply a second voltage input to the option card in the option card receptacle and detect a second output value from the option card, wherein the second voltage is distinct from the first voltage;

determine an identifier of the option card based on a combination of the first output value and the second output value; and

based on the identifier of the option card, configure the option card for the computing device.

2 . The computing device of claim 1 , wherein the first voltage input is applied to the option card when the computing device is in a first power state, and the second voltage input is applied to the option card when the computing device is in a second power state.

3 . The computing device of claim 2 , wherein the first power state comprises a sleep state and the second power state comprises a power-on state.

4 . The computing device of claim 1 , wherein the controller is to detect the first output value and the second output value at an analog-to-digital converter pin detecting first voltage values and second voltage values, respectively, output values from the option card.

5 . The computing device of claim 1 , wherein the controller is to retrieve a multi-state identifier mapping to determine the identifier of the option card when the first output value and the second output value are different.

6 . The computing device of claim 1 , wherein the controller is to retrieve a legacy identifier mapping to determine the identifier of the option card when the first output value and the second output value are the same.

7 . A computing device comprising:

an option card receptacle to receive an option card;

a controller interconnected with the option card receptacle, the controller to:

apply a first voltage input to the option card in the option card receptacle when the computing device is in a first power state and detect a first output value from the option card;

in response to the computing device transitioning to a second power state, apply a second voltage input to the option card in the option card receptacle and detect a second output value from the option card, wherein the second voltage is distinct from the first voltage;

determine an identifier of the option card based on a combination of the first output value and the second output value; and

based on the identifier of the option card, configure the option card for the computing device.

8 . The computing device of claim 7 , wherein the first and second output values represent voltage steps output from the option card.

9 . The computing device of claim 7 , wherein to determine the identifier, the controller is to:

identify a first range of a plurality of predefined ranges in which the first output value fails;

identify a second range of the plurality of predefined ranges in which the second output value fails; and

select an option card identifier corresponding to the first range and the second range as the identifier of the option card.

10 . The computing device of claim 9 , wherein the controller is to:

use a multi-state identifier mapping to select a multi-state option card identifier as the identifier of the option card when the first range and the second range are different; and

use a legacy identifier mapping to select a legacy option card identifier as the identifier of the option card when the first range and the second range are the same.