USB Gadget API for Linux
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Core Objects and Methods

Table of Contents
struct usb_request -- describes one i/o request
struct usb_ep -- device side representation of USB endpoint
usb_ep_enable -- configure endpoint, making it usable
usb_ep_disable -- endpoint is no longer usable
usb_ep_alloc_request -- allocate a request object to use with this endpoint
usb_ep_free_request -- frees a request object
usb_ep_alloc_buffer -- allocate an I/O buffer
usb_ep_free_buffer -- frees an i/o buffer
usb_ep_queue -- queues (submits) an I/O request to an endpoint.
usb_ep_dequeue -- dequeues (cancels, unlinks) an I/O request from an endpoint
usb_ep_set_halt -- sets the endpoint halt feature.
usb_ep_clear_halt -- clears endpoint halt, and resets toggle
usb_ep_fifo_status -- returns number of bytes in fifo, or error
usb_ep_fifo_flush -- flushes contents of a fifo
struct usb_gadget -- represents a usb slave device
usb_gadget_frame_number -- returns the current frame number
usb_gadget_wakeup -- tries to wake up the host connected to this gadget
usb_gadget_set_selfpowered -- sets the device selfpowered feature.
usb_gadget_clear_selfpowered -- clear the device selfpowered feature.
usb_gadget_vbus_connect -- Notify controller that VBUS is powered
usb_gadget_vbus_draw -- constrain controller's VBUS power usage
usb_gadget_vbus_disconnect -- notify controller about VBUS session end
usb_gadget_connect -- software-controlled connect to USB host
usb_gadget_disconnect -- software-controlled disconnect from USB host
struct usb_gadget_driver -- driver for usb 'slave' devices
usb_gadget_register_driver -- register a gadget driver
usb_gadget_unregister_driver -- unregister a gadget driver
struct usb_string -- wraps a C string and its USB id
struct usb_gadget_strings -- a set of USB strings in a given language

These are declared in <linux/usb_gadget.h>, and are used by gadget drivers to interact with USB peripheral controller drivers.

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struct usb_ctrlrequest	Up	struct usb_request