Missing values in libusb_speed and libusb_supported_speed enums

[fabiensanglard]

I have noticed that enum libusb_speed does not support speed beyond 10000Mbps.

enum libusb_speed {
	/** The OS doesn't report or know the device speed. */
	LIBUSB_SPEED_UNKNOWN = 0,

	/** The device is operating at low speed (1.5MBit/s). */
	LIBUSB_SPEED_LOW = 1,

	/** The device is operating at full speed (12MBit/s). */
	LIBUSB_SPEED_FULL = 2,

	/** The device is operating at high speed (480MBit/s). */
	LIBUSB_SPEED_HIGH = 3,

	/** The device is operating at super speed (5000MBit/s). */
	LIBUSB_SPEED_SUPER = 4,

	/** The device is operating at super speed plus (10000MBit/s). */
	LIBUSB_SPEED_SUPER_PLUS = 5
};

Likewise, enum libusb_supported_speed has not support beyond 5000Mbps.

enum libusb_supported_speed {
	/** Low speed operation supported (1.5MBit/s). */
	LIBUSB_LOW_SPEED_OPERATION = (1 << 0),

	/** Full speed operation supported (12MBit/s). */
	LIBUSB_FULL_SPEED_OPERATION = (1 << 1),

	/** High speed operation supported (480MBit/s). */
	LIBUSB_HIGH_SPEED_OPERATION = (1 << 2),

	/** Superspeed operation supported (5000MBit/s). */
	LIBUSB_SUPER_SPEED_OPERATION = (1 << 3)
};

Is it an oversight or something libusb has no access to?

[tormodvolden]

See also #680

[fabiensanglard]

I have made more testing with another setting. The configuration I used was:

Mac M1 -> Caldigit TS4+ -> Pixel 6

Reported speed (via libusb_get_device_speed): LIBUSB_SPEED_SUPER_PLUS = 10,000

Reported max supported (via libusb_ss_usb_device_capability_descriptor): LIBUSB_SUPER_SPEED_OPERATION = 5,000

The numbers indicate a speed superior to the maximum supported speed. Which make no sense.

[fabiensanglard]

It looks like there is already a PR to solve this issue: #1298