* If this interface does not use the USB major, this field should * be unused. * interface association descriptor * the minor number assigned to this interface, if this * interface is bound to a driver that uses the USB major number. Each one includes a set of * endpoint configurations. */ struct usb_host_endpoint /** * struct usb_interface - what usb device drivers talk to * array of interface structures, one for each alternate * setting that may be selected.

*/ struct ep_device /** * struct usb_host_endpoint - host-side endpoint descriptor and queue * descriptor for this endpoint, wMaxPacketSize in native byteorder * SuperSpeed companion descriptor for this endpoint * SuperSpeedPlus isoc companion descriptor for this endpoint * urbs queued to this endpoint maintained by usbcore * for use by HCD typically holds hardware dma queue head (QH) * with one or more transfer descriptors (TDs) per urb * ep_device for sysfs info * descriptors following this endpoint in the configuration * how many bytes of 'extra' are valid * URBs may be submitted to this endpoint * number of USB-3 streams allocated on the endpoint * * USB requests are always queued to a given endpoint, identified by a * descriptor within an active interface in a given USB configuration. * * Devices may also have class-specific or vendor-specific descriptors. * - a SuperSpeed endpoint has a companion descriptor * * And there might be other descriptors mixed in with those.

Parsing turns them from a flat * sequence of descriptors into a hierarchy: * * - devices have one (usually) or more configs * - configs have one (often) or more interfaces * - interfaces have one (usually) or more settings * - each interface setting has zero or (usually) more endpoints. these are parsed * from the data provided by devices.

* SPDX-License-Identifier: GPL-2.0 */ #ifndef _LINUX_USB_H #define _LINUX_USB_H #include #include #define USB_MAJOR 180 #define USB_DEVICE_MAJOR 189 #ifdef _KERNEL_ #include /* for -ENODEV */ #include /* for mdelay() */ #include /* for in_interrupt() */ #include /* for struct list_head */ #include /* for struct kref */ #include /* for struct device */ #include /* for struct file_operations */ #include /* for struct completion */ #include /* for current & schedule_timeout */ #include /* for struct mutex */ #include /* for runtime PM */ struct usb_device struct usb_driver struct wusb_dev /*-*/ /* * Host-side wrappers for standard USB descriptors.

Usb descriptor type