A USB bus. More...

#include <usb.h>

Data Fields
const char *	name
	Name. More...

struct device *	dev
	Underlying hardware device. More...

struct usb_host_operations *	op
	Host controller operations set. More...

unsigned int	address
	Bus address. More...

size_t	mtu
	Largest transfer allowed on the bus. More...

unsigned long long	addresses
	Address in-use mask. More...

struct usb_hub *	hub
	Root hub. More...

struct list_head	list
	List of USB buses. More...

struct list_head	devices
	List of devices. More...

struct list_head	hubs
	List of hubs. More...

struct usb_bus_host_operations *	host
	Host controller operations. More...

void *	priv
	Host controller private data. More...

Detailed Description

A USB bus.

Definition at line 965 of file usb.h.

Field Documentation

◆ name

const char* usb_bus::name

Name.

Definition at line 967 of file usb.h.

◆ dev

struct device* usb_bus::dev

Underlying hardware device.

Definition at line 969 of file usb.h.

Referenced by alloc_usb_bus(), and ehci_poll_companions().

◆ op

struct usb_host_operations* usb_bus::op

Host controller operations set.

Definition at line 971 of file usb.h.

Referenced by usb_endpoint_open().

◆ address

unsigned int usb_bus::address

Bus address.

This is an internal index used only to allow a USB device to be identified via a nominal bus:device address.

Definition at line 978 of file usb.h.

◆ mtu

size_t usb_bus::mtu

Largest transfer allowed on the bus.

Definition at line 980 of file usb.h.

◆ addresses

unsigned long long usb_bus::addresses

Address in-use mask.

This is used only by buses which perform manual address assignment. USB allows for addresses in the range [1,127]. We use a simple bitmask which restricts us to the range [1,64]; this is unlikely to be a problem in practice. For comparison: controllers which perform autonomous address assignment (such as xHCI) typically allow for only 32 devices per bus anyway.

Definition at line 991 of file usb.h.

◆ hub

struct usb_hub* usb_bus::hub

Root hub.

Definition at line 994 of file usb.h.

Referenced by alloc_usb(), ehci_probe(), register_usb(), register_usb_hub(), uhci_probe(), usbio_start(), xhci_port_status(), and xhci_register().

◆ list

struct list_head usb_bus::list

List of USB buses.

Definition at line 997 of file usb.h.

◆ devices

struct list_head usb_bus::devices

List of devices.

Definition at line 999 of file usb.h.

◆ hubs

struct list_head usb_bus::hubs

List of hubs.

Definition at line 1001 of file usb.h.

◆ host

struct usb_bus_host_operations* usb_bus::host

Host controller operations.

Definition at line 1004 of file usb.h.

◆ priv

void* usb_bus::priv

Host controller private data.

Definition at line 1006 of file usb.h.

The documentation for this struct was generated from the following file:

include/ipxe/usb.h

Data Fields