struct usb_composite_driver
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## Name

struct usb_composite_driver — groups configurations into a gadget

## Synopsis

    struct usb_composite_driver {
      const char * name;
      const struct usb_device_descriptor * dev;
      struct usb_gadget_strings ** strings;
      enum usb_device_speed max_speed;
      unsigned needs_serial:1;
      int (* bind) (struct usb_composite_dev *cdev);
      int (* unbind) (struct usb_composite_dev *);
      void (* disconnect) (struct usb_composite_dev *);
      void (* suspend) (struct usb_composite_dev *);
      void (* resume) (struct usb_composite_dev *);
      struct usb_gadget_driver gadget_driver;
    };

## Members

name

  For diagnostics, identifies the driver.

dev

  Template descriptor for the device, including default device identifiers.

strings

  tables of strings, keyed by identifiers assigned during `bind` and language IDs provided in control requests. Note: The first entries are predefined. The first entry that may be used is USB_GADGET_FIRST_AVAIL_IDX

max_speed

  Highest speed the driver supports.

needs_serial

  set to 1 if the gadget needs userspace to provide a serial number. If one is not provided, warning will be printed.

bind

  (REQUIRED) Used to allocate resources that are shared across the whole device, such as string IDs, and add its configurations using `usb_add_config`(). This may fail by returning a negative errno value; it should return zero on successful initialization.

unbind

  Reverses `bind`; called as a side effect of unregistering this driver.

disconnect

  optional driver disconnect method

suspend

  Notifies when the host stops sending USB traffic, after function notifications

resume

  Notifies configuration when the host restarts USB traffic, before function notifications

gadget_driver

  Gadget driver controlling this driver

## Description

Devices default to reporting self powered operation. Devices which rely on bus powered operation should report this in their `bind` method.

Before returning from `bind`, various fields in the template descriptor may be overridden. These include the idVendor/idProduct/bcdDevice values normally to bind the appropriate host side driver, and the three strings (iManufacturer, iProduct, iSerialNumber) normally used to provide user meaningful device identifiers. (The strings will not be defined unless they are defined in `dev` and `strings`.) The correct ep0 maxpacket size is also reported, as defined by the underlying controller driver.

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