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usb_get_intf(9) [centos man page]

USB_GET_INTF(9) 						   USB Core APIs						   USB_GET_INTF(9)

NAME
usb_get_intf - increments the reference count of the usb interface structure SYNOPSIS
struct usb_interface * usb_get_intf(struct usb_interface * intf); ARGUMENTS
intf the interface being referenced DESCRIPTION
Each live reference to a interface must be refcounted. Drivers for USB interfaces should normally record such references in their probe methods, when they bind to an interface, and release them by calling usb_put_intf, in their disconnect methods. RETURN
A pointer to the interface with the incremented reference counter. COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 USB_GET_INTF(9)

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STRUCT 
USB_DRIVER(9) Host-Side Data Types and Macro STRUCT USB_DRIVER(9) NAME
struct_usb_driver - identifies USB interface driver to usbcore SYNOPSIS
struct usb_driver { const char * name; int (* probe) (struct usb_interface *intf,const struct usb_device_id *id); void (* disconnect) (struct usb_interface *intf); int (* ioctl) (struct usb_interface *intf, unsigned int code,void *buf); int (* suspend) (struct usb_interface *intf, pm_message_t message); int (* resume) (struct usb_interface *intf); int (* reset_resume) (struct usb_interface *intf); int (* pre_reset) (struct usb_interface *intf); int (* post_reset) (struct usb_interface *intf); const struct usb_device_id * id_table; struct usb_dynids dynids; struct usbdrv_wrap drvwrap; unsigned int no_dynamic_id:1; unsigned int supports_autosuspend:1; unsigned int soft_unbind:1; }; MEMBERS
name The driver name should be unique among USB drivers, and should normally be the same as the module name. probe Called to see if the driver is willing to manage a particular interface on a device. If it is, probe returns zero and uses usb_set_intfdata to associate driver-specific data with the interface. It may also use usb_set_interface to specify the appropriate altsetting. If unwilling to manage the interface, return -ENODEV, if genuine IO errors occured, an appropriate negative errno value. disconnect Called when the interface is no longer accessible, usually because its device has been (or is being) disconnected or the driver module is being unloaded. ioctl Used for drivers that want to talk to userspace through the "usbfs" filesystem. This lets devices provide ways to expose information to user space regardless of where they do (or don't) show up otherwise in the filesystem. suspend Called when the device is going to be suspended by the system. resume Called when the device is being resumed by the system. reset_resume Called when the suspended device has been reset instead of being resumed. pre_reset Called by usb_reset_device when the device is about to be reset. post_reset Called by usb_reset_device after the device has been reset id_table USB drivers use ID table to support hotplugging. Export this with MODULE_DEVICE_TABLE(usb,...). This must be set or your driver's probe function will never get called. dynids used internally to hold the list of dynamically added device ids for this driver. drvwrap Driver-model core structure wrapper. no_dynamic_id if set to 1, the USB core will not allow dynamic ids to be added to this driver by preventing the sysfs file from being created. supports_autosuspend if set to 0, the USB core will not allow autosuspend for interfaces bound to this driver. soft_unbind if set to 1, the USB core will not kill URBs and disable endpoints before calling the driver's disconnect method. DESCRIPTION
USB interface drivers must provide a name, probe and disconnect methods, and an id_table. Other driver fields are optional. The id_table is used in hotplugging. It holds a set of descriptors, and specialized data may be associated with each entry. That table is used by both user and kernel mode hotplugging support. The probe and disconnect methods are called in a context where they can sleep, but they should avoid abusing the privilege. Most work to connect to a device should be done when the device is opened, and undone at the last close. The disconnect code needs to address concurrency issues with respect to open and close methods, as well as forcing all pending I/O requests to complete (by unlinking them as necessary, and blocking until the unlinks complete). COPYRIGHT
Kernel Hackers Manual 2.6. July 2010 STRUCT USB_DRIVER(9)
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