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struct_usb_host_endpoint(9) [centos man page]

USB_HOST_ENDP(9) Host-Side Data Types and Macro STRUCT USB_HOST_ENDP(9) NAME
struct_usb_host_endpoint - host-side endpoint descriptor and queue SYNOPSIS
struct usb_host_endpoint { struct usb_endpoint_descriptor desc; struct usb_ss_ep_comp_descriptor ss_ep_comp; struct list_head urb_list; void * hcpriv; struct ep_device * ep_dev; unsigned char * extra; int extralen; int enabled; }; MEMBERS
desc descriptor for this endpoint, wMaxPacketSize in native byteorder ss_ep_comp SuperSpeed companion descriptor for this endpoint urb_list urbs queued to this endpoint; maintained by usbcore hcpriv for use by HCD; typically holds hardware dma queue head (QH) with one or more transfer descriptors (TDs) per urb ep_dev ep_device for sysfs info extra descriptors following this endpoint in the configuration extralen how many bytes of "extra" are valid enabled URBs may be submitted to this endpoint DESCRIPTION
USB requests are always queued to a given endpoint, identified by a descriptor within an active interface in a given USB configuration. COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 STRUCT USB_HOST_ENDP(9)

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USB_HOST_CONF(9) Host-Side Data Types and Macro STRUCT USB_HOST_CONF(9) NAME
struct_usb_host_config - representation of a device's configuration SYNOPSIS
struct usb_host_config { struct usb_config_descriptor desc; char * string; struct usb_interface_assoc_descriptor * intf_assoc[USB_MAXIADS]; struct usb_interface * interface[USB_MAXINTERFACES]; struct usb_interface_cache * intf_cache[USB_MAXINTERFACES]; unsigned char * extra; int extralen; }; MEMBERS
desc the device's configuration descriptor. string pointer to the cached version of the iConfiguration string, if present for this configuration. intf_assoc[USB_MAXIADS] list of any interface association descriptors in this config interface[USB_MAXINTERFACES] array of pointers to usb_interface structures, one for each interface in the configuration. The number of interfaces is stored in desc.bNumInterfaces. These pointers are valid only while the the configuration is active. intf_cache[USB_MAXINTERFACES] array of pointers to usb_interface_cache structures, one for each interface in the configuration. These structures exist for the entire life of the device. extra pointer to buffer containing all extra descriptors associated with this configuration (those preceding the first interface descriptor). extralen length of the extra descriptors buffer. DESCRIPTION
USB devices may have multiple configurations, but only one can be active at any time. Each encapsulates a different operational environment; for example, a dual-speed device would have separate configurations for full-speed and high-speed operation. The number of configurations available is stored in the device descriptor as bNumConfigurations. A configuration can contain multiple interfaces. Each corresponds to a different function of the USB device, and all are available whenever the configuration is active. The USB standard says that interfaces are supposed to be numbered from 0 to desc.bNumInterfaces-1, but a lot of devices get this wrong. In addition, the interface array is not guaranteed to be sorted in numerical order. Use usb_ifnum_to_if to look up an interface entry based on its number. Device drivers should not attempt to activate configurations. The choice of which configuration to install is a policy decision based on such considerations as available power, functionality provided, and the user's desires (expressed through userspace tools). However, drivers can call usb_reset_configuration to reinitialize the current configuration and all its interfaces. COPYRIGHT
Kernel Hackers Manual 2.6. July 2010 STRUCT USB_HOST_CONF(9)
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