STRUCT USB_DRIVER(9)

NAME
struct usb_driver - identifies USB 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);
  const struct usb_device_id * id_table;
  struct usb_dynids dynids;
  struct device_driver driver;
  unsigned int no_dynamic_id: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 dev_set_drvdata 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 a 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.

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.

driver
    the driver model core driver structure.

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.

DESCRIPTION

USB 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).