Automatically configuring a universal serial bus (USB) type-C port of a computing device
View Patent ↗In some implementations a logic device, such as an embedded controller, automatically configures a universal serial bus (USB) Type-C port by connecting the USB Type-C port to appropriate input/output (I/O) signals. For example, the logic device may receive a notification that an external device is connected to a USB Type-C port of a computing device. The logic device may receive data from a port controller over an internal communication bus associated with the USB Type-C port. Based at least in part on the data, the logic device may determine one or more types of signals that the external device is configured to send, receive, or send and receive. The logic device may instruct a cross-point switch to connect the USB Type-C port to one or more signal paths in the computing device to enable the external device to send/receive the one or more types of signals.
1. A method comprising:
receiving, by a logic device, an indication from a port controller of a computing device that an external device is connected via a cable to a universal serial bus (USB) Type-C port of the computing device, wherein the computing device comprises:
a cross-point switch coupled to the logic device,
the USB Type-C port, and
a device bus;
determining, by the logic device, a role of the external device;
in response to determining the role of the external device, determining, by the logic device, a device class of the external device;
in response to determining the device class of the external device, determining by the logic device and based on the role and the device class, whether the external device comprises a display device or a storage device;
in response to determining, by the logic device and based on the role and the device class, that the external device comprises the display device, instructing, by the logic device, the cross-point switch to connect a video signal of the computing device to the USB Type-C port; and
in response to determining, by the logic device and based on the role and the device class, that the external device comprises the storage device, instructing the cross-point switch to connect the USB Type-C port to the device bus of the computing device to enable access to a file system of the storage device.
2. The method of claim 1 , further comprising:
determining a voltage to provide the external device that is approximately between 5 volts and 20 volts;
determining an amperage to provide the external device that is approximately between 100 milliamps and 5 amps; and
instructing, by the logic device, the cross-point switch to connect a power bus of the computing device to the USB Type-C port to provide the voltage and the amperage.
3. The method of claim 1 , wherein determining by the logic device and based on the role and the device class, that the external device comprises the display device further comprises:
determining that the external device is using a display port (DP) alternate mode; and
instructing the cross-point switch to provide one or more DP lanes to the USB Type-C port.
4. The method of claim 1 , wherein the logic device comprises an embedded controller.
5. The method of claim 1 , wherein the role comprises one of a downward facing port or an upward facing port.
6. The method of claim 1 , further comprising:
determining that the external device is using functional extensions; and
configuring the USB Type-C port to support the functional extensions.
7. The method of claim 1 , wherein the logic device monitors a communications channel associated with the USB Type-C port to determine one or more types of signals that the external device is configured to send, receive, or send and receive.
8. A computing device comprising:
one or more processors;
one or more memory storage devices;
one or more universal serial bus (USB) Type-C ports;
a device bus;
a cross-point switch; and
a logic device configured to perform operations comprising:
receiving an indication from a port controller of the computing device that an external device is connected via a cable to a particular USB Type-C port of the one or more USB Type-C ports;
determining a role of the external device;
in response to determining the role of the external device, determining a device class of the external device;
in response to determining the device class of the external device, determining, based on the role and the device class, whether the external device comprises a display device or a storage device;
in response to determining, based on the role and the device class, that the external device comprises the display device, instructing the cross-point switch to connect a video signal of the computing device to the particular USB Type-C port; and
in response to determining, based at least in part on the role and the device class, that the external device comprises the storage device, instructing the cross-point switch to connect the device bus of the computing device to the particular USB Type-C port to enable access to a file system of the storage device.
9. The computing device of claim 8 , wherein the role comprises one of a downward facing port or an upward facing port.
10. The computing device of claim 8 , wherein the device class comprises one of an audio device class, a communications device class, a human interface device class, a physical interface device class, an image device class, a printer device class, a mass storage device class, a USB hub device class, a smart card device class, a security device class, a video device class, a personal healthcare device class, an audio/video device class, a diagnostic device class, a wireless controller device class, an application-specific device class, or a vendor specific device class.
11. The computing device of claim 8 , wherein the logic device comprises an embedded controller.
12. The computing device of claim 8 , wherein the operations further comprise:
determining a voltage to provide the external device that is approximately between 5 volts and 20 volts;
determining an amperage to provide the external device that is approximately between 100 milliamps and 5 amps; and
instructing the cross-point switch to connect a power bus of the computing device to the particular USB Type-C port to provide the voltage and the amperage.
13. The computing device of claim 8 , wherein determining based on the role and the device class, that the external device comprises the display device further comprises:
determining that the external device is using a display port (DP) alternate mode; and
instructing the cross-point switch to provide one or more DP lanes to the particular USB Type-C port.
14. An embedded controller programmed with instructions to perform operations comprising:
receiving an indication from a port controller that an external device is connected via a cable to a universal serial bus (USB) Type-C port of a computing device, wherein the computing device comprises:
the embedded controller,
a cross-point switch coupled to the embedded controller,
the USB Type-C port, and
a device bus;
determining a role of the external device;
in response to determining the role of the external device, determining a device class of the external device;
in response to determining the device class of the external device, determining, based on the role and the device class, whether the external device comprises a display device or a storage device;
in response to determining, based on the role and the device class, that the external device comprises the display device, instructing the cross-point switch to connect a video signal of the computing device to the USB Type-C port; and
in response to determining, based on the role and the device class, that the external device comprises the storage device, instructing the cross-point switch to connect the USB Type-C port to the device bus of the computing device to enable access to a file system of the storage device.
15. The embedded controller of claim 14 , wherein the role comprises one of a downward facing port or an upward facing port.
16. The embedded controller of claim 14 , the operations further comprising:
receiving, over a configuration channel associated with the USB Type-C port, data indicating one or more types of signals that the external device is configured to communicate, wherein the data is sent by a port controller associated with the USB Type-C port.
17. The embedded controller of claim 14 , the operations further comprising:
negotiating power delivery to the external device.
18. The embedded controller of claim 17 , wherein negotiating the power delivery to the external device comprises:
negotiating a voltage that is approximately between 5 volts and 20 volts;
negotiating an amperage that is approximately between 100 milliamps and 5 amps; and
instructing the cross-point switch to connect a power bus of the computing device to the USB Type-C port to provide the voltage and the amperage.
19. The embedded controller of claim 14 , the operations further comprising:
determining that the external device is using an alternate mode; and
instructing the cross-point switch to connect the USB Type-C port to support the alternate mode.
20. The embedded controller of claim 14 , wherein the device class of the external device comprises:
one of: an audio device class, a communications device class, a human interface device class, a physical interface device class, an image device class, a printer device class, a mass storage device class, a USB hub device class, a smart card device class, a security device class, a vide device class, a personal healthcare device class, an audio/video device class, a diagnostic device class, a wireless controller device class, an application-specific device class, or a vendor specific device class.