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usb_cfg_descr(9s)

Kernel & Driver Data Structures                              usb_cfg_descr(9S)



NAME
       usb_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
       https://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(7) for descriptions of the following attributes:


       tab()  box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
       TRIBUTE VALUE _ ArchitecturePCI-based systems  _  Interface  Stability‐
       Committed _ Availabilitysystem/io/usb


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_dev_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)



Oracle Solaris 11.4               5 Jan 2004                 usb_cfg_descr(9S)
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