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usb_hub_find_child(9) [centos man page]

USB_HUB_FIND_CHILD(9)						   USB Core APIs					     USB_HUB_FIND_CHILD(9)

usb_hub_find_child - Get the pointer of child device attached to the port which is specified by port1. SYNOPSIS
struct usb_device * usb_hub_find_child(struct usb_device * hdev, int port1); ARGUMENTS
hdev USB device belonging to the usb hub port1 port num to indicate which port the child device is attached to. DESCRIPTION
USB drivers call this function to get hub's child device pointer. RETURN
NULL if input param is invalid and child's usb_device pointer if non-NULL. COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 USB_HUB_FIND_CHILD(9)

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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_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; int string_langid; char * product; char * manufacturer; char * serial; struct list_head filelist; #ifdef CONFIG_USB_DEVICE_CLASS struct device * usb_classdev; #endif #ifdef CONFIG_USB_DEVICEFS struct dentry * usbfs_dentry; #endif int maxchild; struct usb_device * children[USB_MAXCHILDREN]; u32 quirks; atomic_t urbnum; unsigned long active_duration; #ifdef CONFIG_PM unsigned long last_busy; int autosuspend_delay; unsigned long connect_time; unsigned do_remote_wakeup:1; unsigned reset_resume:1; unsigned autosuspend_disabled:1; #endif struct wusb_dev * wusb_dev; int slot_id; }; 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 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 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 usb_classdev USB class device that was created for usbfs device access from userspace usbfs_dentry usbfs dentry entry for the device maxchild number of ports if hub children[USB_MAXCHILDREN] child devices - USB devices that are attached to this hub quirks quirks of the whole device urbnum number of URBs submitted for the whole device active_duration total time device is not suspended last_busy time of last use autosuspend_delay in jiffies connect_time time device was first connected do_remote_wakeup remote wakeup should be enabled reset_resume needs reset instead of resume autosuspend_disabled autosuspend disabled by the user 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 NOTES
Usbcore drivers should not set usbdev->state directly. Instead use usb_set_device_state. COPYRIGHT
Kernel Hackers Manual 2.6. July 2010 STRUCT USB_DEVICE(9)
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