USB_CFG_DESCR(9S)USB_CFG_DESCR(9S)NAMEusb_cfg_descr - USB configuration descriptor
SYNOPSIS
#include <sys/usb/usba.h>
INTERFACE LEVEL
Solaris DDI specific (Solaris DDI)
DESCRIPTION
The usb_cfg_descr_t configuration descriptor defines attributes of a
configuration. A configuration contains one or more interfaces. A con‐
figuration descriptor acts as a header for the group of other descrip‐
tors describing the subcomponents (for example, interfaces and end‐
points) of a configuration. Please refer to Section 9.6.3 of the USB
2.0 specification. The USB 2.0 specification is available at
www.usb.org.
One or more configuration descriptors are retrieved from a USB device
during device enumeration. They can be accessed via
usb_get_dev_data(9F).
A configuration descriptor has the following fields:
uint8_t bLength Size of this descriptor
in bytes.
uint8_t bDescriptorType Set to USB_DESCR_TYPE_CFG.
uint16_t wTotalLength Total length of data returned
including this and all other
descriptors in this configuration.
uint8_t bNumInterfaces Number of interfaces in this
configuration.
uint8_t bConfigurationValue ID of this configuration
(1-based).
uint8_t iConfiguration Index of optional configuration
string. Valid if > 0.
uint8_t bmAttributes Configuration characteristics
(See below).
uint8_t bMaxPower Maximum power consumption, in
2mA units.
Configuration descriptors define the following bmAttributes:
USB_CFG_ATTR_SELFPWR - Set if config not using bus power.
USB_CFG_ATTR_REMOTE_WAKEUP - Set if config supports rem wakeup.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌────────────────────┬───────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├────────────────────┼───────────────────┤
│Architecture │ PCI-based systems │
├────────────────────┼───────────────────┤
│Interface stability │ Committed │
└────────────────────┴───────────────────┘
SEE ALSOattributes(5), usb_get_alt_if(9F), usb_get_cfg(9F),
usb_get_dev_data(9F), usb_get_string_descr(9F), usb_parse_data(9F),
usb_ctrl_request(9S), usb_dev_descr(9S), usb_dev_qlf_descr(9S),
usb_ep_descr(9S), usb_if_descr(9S), usb_other_speed_cfg_descr(9S),
usb_string_descr(9S)
Jan 5, 2004 USB_CFG_DESCR(9S)
