usb_dev_qlf_descr - USB device qualifier descriptor
#include <sys/usb/usba.h>
illumos DDI specific (illumos DDI)
The device qualifier descriptor usb_dev_qlf_descr_t defines how fields of
a high speed device's device descriptor would look if that device is run at a
different speed. If a high-speed device is running currently at full/high
speed, fields of this descriptor reflect how device descriptor fields would
look if speed was changed to high/full. Please refer to section 9.6.2
of the USB 2.0 specification. The USB 2.0 specification is
available at www.usb.org.
A device descriptor contains the following fields:
uint8_t bLength Size of this descriptor.
uint8_t bDescriptorType Set to USB_DESCR_TYPE_DEV_QLF.
uint16_t bcdUSB USB specification release
number in binary coded decimal.
uint8_t bDeviceClass Device class code.
(See usb_dev_descr(9s).)
uint8_t bDeviceSubClass Device 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.
uint8_t bNumConfigurations Number of available
configurations.
uint8_t bReserved Reserved.
See attributes(7) for descriptions of the following attributes:
| ATTRIBUTE
TYPE |
ATTRIBUTE VALUE |
| 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_descr(9S),
usb_ep_descr(9S), usb_if_descr(9S),
usb_other_speed_cfg_descr(9S), usb_string_descr(9S)