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STRUCT USB_COMPOSITE(9) Kernel Mode Gadget API STRUCT USB_COMPOSITE(9)

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;


  int (* bind) (struct usb_composite_dev *);


  int (* unbind) (struct usb_composite_dev *);


  void (* suspend) (struct usb_composite_dev *);


  void (* resume) (struct usb_composite_dev *);
};

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

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.

suspend

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

resume

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

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.

AUTHOR

David Brownell <dbrownell@users.sourceforge.net>

Author.

COPYRIGHT

May 2024 Kernel Hackers Manual 2.6.