1STRUCT USB_INTERFACE(9) Host-Side Data Types and Macro STRUCT USB_INTERFACE(9)
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NAME

6       struct_usb_interface_cache - long-term representation of a device
7       interface
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SYNOPSIS

10       struct usb_interface_cache {
11         unsigned num_altsetting;
12         struct kref ref;
13         struct usb_host_interface altsetting[0];
14       };
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MEMBERS

17       num_altsetting
18           number of altsettings defined.
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20       ref
21           reference counter.
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23       altsetting[0]
24           variable-length array of interface structures, one for each
25           alternate setting that may be selected. Each one includes a set of
26           endpoint configurations. They will be in no particular order.
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DESCRIPTION

29       These structures persist for the lifetime of a usb_device, unlike
30       struct usb_interface (which persists only as long as its configuration
31       is installed). The altsetting arrays can be accessed through these
32       structures at any time, permitting comparison of configurations and
33       providing support for the /sys/kernel/debug/usb/devices pseudo-file.
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36Kernel Hackers Manual 3.10         June 2019           STRUCT USB_INTERFACE(9)
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