Advanced Configuration and Power Interface Specification

ACPI-Defined Devices and Device-Specific Objects
Device(PRT1) {
Name(_ADR, 0x00000001)
// USB port configuration object. This object returns the system
// specific USB port configuration information for port number 1
// Must match the _UPC declaration for USB0.RHUB.PRT1 as this host
// controller is a companion to the EHCI host controller
// provide physical port location info for port 1
Name( _UPC, Package(){
0xFF,
// Port is connectable
0x00, // Connector type – Type ‘A’
0x00000000, // Reserved 0 – must be zero
0x00000000})
// Reserved 1 – must be zero
// Must match the _PLD declaration for USB0.RHUB.PRT1 as this host
// controller is a companion to the EHCI host controller
Name( _PLD, Package(1) {
Buffer( 0x14) {
0x82,0x00,0x00,0x00, // Revision 2, Ignore color
// Color (ignored), width and height not
0x00,0x00,0x00,0x00, // required as this is a standard USB ‘A’
// type connector
0xa1,0x10,0x00,0x00, // User visible, front panel, Vertical
// lower, horz. Left, shape = horz. Rect.
0x03,0x00,0x00,0x00, // ejectable, requires OPSM eject assistance
0xFF,0xFF,0xFF,0xFF})} // Vert. and Horiz. Offsets not supplied
} // Device( PRT1)
//
// Define other ports, control methods, etc
…
…
} // Device( RHUB)
} // Device( USB1)
} // Device( PCI0)
} // Scope( _\SB)
9.14 Device Object Name Collision
Devices containing both _HID and _CID may have device specific control methods pertaining to
both the device ID in the _HID and the device ID in the _CID. These device specific control
methods are defined by the device owner (a standard body or a vendor or a group of vendor
partners). Since these object names are not controlled by a central authority, there is a likelihood that
the names of objects will conflict between two defining parties. The _DSM object described in the
next section solves this conflict.
9.14.1 _DSM (Device Specific Method)
This optional object is a control method that enables devices to provide device specific control
functions that are consumed by the device driver.
Arguments: (4)
Arg0 – A Buffer containing a UUID
Arg1 – An Integer containing the Revision ID
Arg2 – An Integer containing the Function Index
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