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

NAME

usb_dev_qlf_descr - USB device qualifier descriptor

SYNOPSIS

#include <sys/usb/usba.h>

INTERFACE LEVEL

illumos DDI specific (illumos DDI)

DESCRIPTION

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.

ATTRIBUTES

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


+--------------------+-------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-------------------+
|Architecture | PCI-based systems |
+--------------------+-------------------+
|Interface stability | Committed |
+--------------------+-------------------+

SEE ALSO

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)

January 5, 2004 USB_DEV_QLF_DESCR(9S)