USB_INTERFACE_ID - Online Linux Manual PageSection : 9
Updated : June 2018
Source : Kernel Hackers Manual 2​.6​.
Note : Kernel Mode Gadget API

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NAMEusb_interface_id − allocate an unused interface ID

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SYNOPSISint usb_interface_id(struct usb_configuration * config, struct usb_function * function);

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ARGUMENTSconfig configuration associated with the interface function function handling the interface

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CONTEXTsingle threaded during gadget setup

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DESCRIPTIONusb_interface_id is called from usb_function​.bind callbacks to allocate new interface IDs​. The function driver will then store that ID in interface, association, CDC union, and other descriptors​. It will also handle any control requests targetted at that interface, particularly changing its altsetting via set_alt​. There may also be class−specific or vendor−specific requests to handle​. All interface identifier should be allocated using this routine, to ensure that for example different functions don´t wrongly assign different meanings to the same identifier​. Note that since interface identifers are configuration−specific, functions used in more than one configuration (or more than once in a given configuration) need multiple versions of the relevant descriptors​. Returns the interface ID which was allocated; or −ENODEV if no more interface IDs can be allocated​.

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AUTHORDavid Brownell <​dbrownell@users.sourceforge.net​> Author.

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