USB_DEV_DESCR(9S) Data Structures for Drivers USB_DEV_DESCR(9S)

usb_dev_descr - USB device descriptor

#include <sys/usb/usba.h>

illumos DDI specific (illumos DDI)

The usb_dev_descr_t device descriptor defines device-wide attributes. Please refer to Section 9.6.1 of the USB 2.0 specification. The USB 2.0 specification is available at

The device descriptor is retrieved from a USB device during device enumeration and can be accessed via usb_get_dev_data(9F).

A device descriptor contains the following fields:

 uint8_t     bLength             Size of this descriptor,
                                  in bytes.
  uint8_t     bDescriptorType     Set to USB_DESCR_TYPE_DEV.
  uint16_t    bcdUSB              USB specification release
                                  number supported, in bcd.
  uint8_t     bDeviceClass        Class code (see below).
  uint8_t     bDeviceSubClass     Subclass code (see USB 2.0
                                  specification of applicable
                                  device class for information.)
  uint8_t     bDeviceProtocol     Protocol code (see USB 2.0
                                  specification of applicable
                                  device class for information.)
  uint8_t     bMaxPacketSize0     Maximum packet size of
                                  endpoint 0.
  uint16_t    idVendor            vendor ID value.
  uint16_t    idProduct           product ID value.
  uint16_t    bcdDevice           Device release number in
                                  binary coded decimal.
  uint8_t     iManufacturer       Index of optional manufacturer
                                  description string.
                                  Valid if > 0.
  uint8_t     iProduct            Index of optional product
                                  description string.
                                  Valid if > 0.
  uint8_t     iSerialNumber       Index of optional serial
                                  number string.
                                  Valid if > 0.
  uint8_t     bNumConfigurations  Number of available
  Device descriptors bDeviceClass values:
  USB_CLASS_PER_INTERFACE         Class information is at
                                  interface level.
  USB_CLASS_COMM                  CDC control device class.
  USB_CLASS_DIAG                  Diagnostic device class.
  USB_CLASS_HUB                   HUB device class.
  USB_CLASS_MISC                  MISC device class.
  USB_CLASS_VENDOR_SPEC           Vendor-specific class.
  USB_CLASS_WIRELESS              Wireless controller
                                  device class.

See attributes(7) for descriptions of the following attributes:

Architecture PCI-based systems
Interface stability Committed

attributes(7), usb_get_alt_if(9F), usb_get_cfg(9F), usb_get_dev_data(9F), usb_get_string_descr(9F), usb_parse_data(9F), usb_cfg_descr(9S), usb_ctrl_request(9S), usb_dev_qlf_descr(9S), usb_ep_descr(9S), usb_if_descr(9S), usb_other_speed_cfg_descr(9S), usb_string_descr(9S)
January 5, 2004 OmniOS