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

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NAMEusb_gadget_config_buf − builts a complete configuration descriptor

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SYNOPSISint usb_gadget_config_buf(const struct usb_config_descriptor * config, void * buf, unsigned length, const struct usb_descriptor_header ** desc);

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ARGUMENTSconfig Header for the descriptor, including characteristics such as power requirements and number of interfaces​. buf Buffer for the resulting configuration descriptor​. length Length of buffer​. If this is not big enough to hold the entire configuration descriptor, an error code will be returned​. desc Null−terminated vector of pointers to the descriptors (interface, endpoint, etc) defining all functions in this device configuration​.

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DESCRIPTIONThis copies descriptors into the response buffer, building a descriptor for that configuration​. It returns the buffer length or a negative status code​. The config​.wTotalLength field is set to match the length of the result, but other descriptor fields (including power usage and interface count) must be set by the caller​. Gadget drivers could use this when constructing a config descriptor in response to USB_REQ_GET_DESCRIPTOR​. They will need to patch the resulting bDescriptorType value if USB_DT_OTHER_SPEED_CONFIG is needed​.

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

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