usb_add_function
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## Name

usb_add_function — add a function to a configuration

## Synopsis

`int usb_add_function (` | struct usb_configuration * config,
| struct usb_function * function`)`;

## Arguments

`config`

  the configuration

`function`

  the function being added

## Context

single threaded during gadget setup

## Description

After initialization, each configuration must have one or more functions added to it. Adding a function involves calling its @`bind` method to allocate resources such as interface and string identifiers and endpoints.

This function returns the value of the function's `bind`, which is zero for success else a negative errno value.

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