USB 2.0 Chapter 9 Types and Constants
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## USB 2.0 Chapter 9 Types and Constants

Gadget drivers rely on common USB structures and constants defined in the `<linux/usb/ch9.h>` header file, which is standard in Linux 2.6 kernels. These are the same types and constants used by host side drivers (and usbcore).

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Chapter 3. Kernel Mode Gadget API | Home | struct usb_ctrlrequest