STRUCT 
USB_DEVICE(9)					  Host-Side Data Types and Macro				      STRUCT USB_DEVICE(9)

NAME

       struct_usb_device - kernel's representation of a USB device

SYNOPSIS

       struct usb_device {
	 int devnum;
	 char devpath[16];
	 u32 route;
	 enum usb_device_state state;
	 enum usb_device_speed speed;
	 struct usb_tt * tt;
	 int ttport;
	 unsigned int toggle[2];
	 struct usb_device * parent;
	 struct usb_bus * bus;
	 struct usb_host_endpoint ep0;
	 struct device dev;
	 struct usb_device_descriptor descriptor;
	 struct usb_host_bos * bos;
	 struct usb_host_config * config;
	 struct usb_host_config * actconfig;
	 struct usb_host_endpoint * ep_in[16];
	 struct usb_host_endpoint * ep_out[16];
	 char ** rawdescriptors;
	 unsigned short bus_mA;
	 u8 portnum;
	 u8 level;
	 unsigned can_submit:1;
	 unsigned persist_enabled:1;
	 unsigned have_langid:1;
	 unsigned authorized:1;
	 unsigned authenticated:1;
	 unsigned wusb:1;
	 unsigned lpm_capable:1;
	 unsigned usb2_hw_lpm_capable:1;
	 unsigned usb2_hw_lpm_besl_capable:1;
	 unsigned usb2_hw_lpm_enabled:1;
	 unsigned usb3_lpm_enabled:1;
	 int string_langid;
	 char * product;
	 char * manufacturer;
	 char * serial;
	 struct list_head filelist;
	 int maxchild;
	 u32 quirks;
	 atomic_t urbnum;
	 unsigned long active_duration;
       #ifdef CONFIG_PM
	 unsigned long connect_time;
	 unsigned do_remote_wakeup:1;
	 unsigned reset_resume:1;
	 unsigned port_is_suspended:1;
       #endif
	 struct wusb_dev * wusb_dev;
	 int slot_id;
	 enum usb_device_removable removable;
	 struct usb2_lpm_parameters l1_params;
	 struct usb3_lpm_parameters u1_params;
	 struct usb3_lpm_parameters u2_params;
	 unsigned lpm_disable_count;
       };

MEMBERS

       devnum
	   device number; address on a USB bus

       devpath[16]
	   device ID string for use in messages (e.g., /port/...)

       route
	   tree topology hex string for use with xHCI

       state
	   device state: configured, not attached, etc.

       speed
	   device speed: high/full/low (or error)

       tt
	   Transaction Translator info; used with low/full speed dev, highspeed hub

       ttport
	   device port on that tt hub

       toggle[2]
	   one bit for each endpoint, with ([0] = IN, [1] = OUT) endpoints

       parent
	   our hub, unless we're the root

       bus
	   bus we're part of

       ep0
	   endpoint 0 data (default control pipe)

       dev
	   generic device interface

       descriptor
	   USB device descriptor

       bos
	   USB device BOS descriptor set

       config
	   all of the device's configs

       actconfig
	   the active configuration

       ep_in[16]
	   array of IN endpoints

       ep_out[16]
	   array of OUT endpoints

       rawdescriptors
	   raw descriptors for each config

       bus_mA
	   Current available from the bus

       portnum
	   parent port number (origin 1)

       level
	   number of USB hub ancestors

       can_submit
	   URBs may be submitted

       persist_enabled
	   USB_PERSIST enabled for this device

       have_langid
	   whether string_langid is valid

       authorized
	   policy has said we can use it; (user space) policy determines if we authorize this device to be used or not. By default, wired USB
	   devices are authorized. WUSB devices are not, until we authorize them from user space. FIXME -- complete doc

       authenticated
	   Crypto authentication passed

       wusb
	   device is Wireless USB

       lpm_capable
	   device supports LPM

       usb2_hw_lpm_capable
	   device can perform USB2 hardware LPM

       usb2_hw_lpm_besl_capable
	   device can perform USB2 hardware BESL LPM

       usb2_hw_lpm_enabled
	   USB2 hardware LPM enabled

       usb3_lpm_enabled
	   USB3 hardware LPM enabled

       string_langid
	   language ID for strings

       product
	   iProduct string, if present (static)

       manufacturer
	   iManufacturer string, if present (static)

       serial
	   iSerialNumber string, if present (static)

       filelist
	   usbfs files that are open to this device

       maxchild
	   number of ports if hub

       quirks
	   quirks of the whole device

       urbnum
	   number of URBs submitted for the whole device

       active_duration
	   total time device is not suspended

       connect_time
	   time device was first connected

       do_remote_wakeup
	   remote wakeup should be enabled

       reset_resume
	   needs reset instead of resume

       port_is_suspended
	   the upstream port is suspended (L2 or U3)

       wusb_dev
	   if this is a Wireless USB device, link to the WUSB specific data for the device.

       slot_id
	   Slot ID assigned by xHCI

       removable
	   Device can be physically removed from this port

       l1_params
	   best effor service latency for USB2 L1 LPM state, and L1 timeout.

       u1_params
	   exit latencies for USB3 U1 LPM state, and hub-initiated timeout.

       u2_params
	   exit latencies for USB3 U2 LPM state, and hub-initiated timeout.

       lpm_disable_count
	   Ref count used by usb_disable_lpm and usb_enable_lpm to keep track of the number of functions that require USB 3.0 Link Power
	   Management to be disabled for this usb_device. This count should only be manipulated by those functions, with the bandwidth_mutex is
	   held.

NOTES

       Usbcore drivers should not set usbdev->state directly. Instead use usb_set_device_state.

COPYRIGHT

Kernel Hackers Manual 3.10					     June 2014						      STRUCT USB_DEVICE(9)