Specifying Device Types
Each device object has a device type, which is stored in the DeviceType member of its DEVICE_OBJECT structure. The device type represents the type of underlying hardware for the driver.
Every kernel-mode driver that creates a device object must specify an appropriate device type value when calling IoCreateDevice. The IoCreateDevice routine uses the supplied device type to initialize the DeviceType member of the DEVICE_OBJECT structure.
The system defines the following device type values, listed in alphabetical order:
#define FILE_DEVICE_8042_PORT 0x00000027
#define FILE_DEVICE_ACPI 0x00000032
#define FILE_DEVICE_BATTERY 0x00000029
#define FILE_DEVICE_BEEP 0x00000001
#define FILE_DEVICE_BUS_EXTENDER 0x0000002a
#define FILE_DEVICE_CD_ROM 0x00000002
#define FILE_DEVICE_CD_ROM_FILE_SYSTEM 0x00000003
#define FILE_DEVICE_CHANGER 0x00000030
#define FILE_DEVICE_CONTROLLER 0x00000004
#define FILE_DEVICE_DATALINK 0x00000005
#define FILE_DEVICE_DFS 0x00000006
#define FILE_DEVICE_DFS_FILE_SYSTEM 0x00000035
#define FILE_DEVICE_DFS_VOLUME 0x00000036
#define FILE_DEVICE_DISK 0x00000007
#define FILE_DEVICE_DISK_FILE_SYSTEM 0x00000008
#define FILE_DEVICE_DVD 0x00000033
#define FILE_DEVICE_FILE_SYSTEM 0x00000009
#define FILE_DEVICE_FIPS 0x0000003a
#define FILE_DEVICE_FULLSCREEN_VIDEO 0x00000034
#define FILE_DEVICE_INPORT_PORT 0x0000000a
#define FILE_DEVICE_KEYBOARD 0x0000000b
#define FILE_DEVICE_KS 0x0000002f
#define FILE_DEVICE_KSEC 0x00000039
#define FILE_DEVICE_MAILSLOT 0x0000000c
#define FILE_DEVICE_MASS_STORAGE 0x0000002d
#define FILE_DEVICE_MIDI_IN 0x0000000d
#define FILE_DEVICE_MIDI_OUT 0x0000000e
#define FILE_DEVICE_MODEM 0x0000002b
#define FILE_DEVICE_MOUSE 0x0000000f
#define FILE_DEVICE_MULTI_UNC_PROVIDER 0x00000010
#define FILE_DEVICE_NAMED_PIPE 0x00000011
#define FILE_DEVICE_NETWORK 0x00000012
#define FILE_DEVICE_NETWORK_BROWSER 0x00000013
#define FILE_DEVICE_NETWORK_FILE_SYSTEM 0x00000014
#define FILE_DEVICE_NETWORK_REDIRECTOR 0x00000028
#define FILE_DEVICE_NULL 0x00000015
#define FILE_DEVICE_PARALLEL_PORT 0x00000016
#define FILE_DEVICE_PHYSICAL_NETCARD 0x00000017
#define FILE_DEVICE_PRINTER 0x00000018
#define FILE_DEVICE_SCANNER 0x00000019
#define FILE_DEVICE_SCREEN 0x0000001c
#define FILE_DEVICE_SERENUM 0x00000037
#define FILE_DEVICE_SERIAL_MOUSE_PORT 0x0000001a
#define FILE_DEVICE_SERIAL_PORT 0x0000001b
#define FILE_DEVICE_SMARTCARD 0x00000031
#define FILE_DEVICE_SMB 0x0000002e
#define FILE_DEVICE_SOUND 0x0000001d
#define FILE_DEVICE_STREAMS 0x0000001e
#define FILE_DEVICE_TAPE 0x0000001f
#define FILE_DEVICE_TAPE_FILE_SYSTEM 0x00000020
#define FILE_DEVICE_TERMSRV 0x00000038
#define FILE_DEVICE_TRANSPORT 0x00000021
#define FILE_DEVICE_UNKNOWN 0x00000022
#define FILE_DEVICE_VDM 0x0000002c
#define FILE_DEVICE_VIDEO 0x00000023
#define FILE_DEVICE_VIRTUAL_DISK 0x00000024
#define FILE_DEVICE_WAVE_IN 0x00000025
#define FILE_DEVICE_WAVE_OUT 0x00000026
These constants are defined in Ntddk.h and Wdm.h. Check these files to see whether additional device types have been defined.
The FILE_DEVICE_DISK specification covers disk partitions and any object that appears as a disk.
Intermediate drivers usually specify device types that represent the underlying device. For example, the system-supplied fault-tolerant disk driver, ftdisk, creates device objects of type FILE_DEVICE_DISK; it does not define new device types for the mirror sets, stripe sets, and volume sets it manages.
FILE_DEVICE_XXX values in the range of 0 through 32767 are reserved for Microsoft. All driver writers must use these system-defined constants for devices belonging to the system-defined device types.
If a type of hardware does not match any of the defined types, specify a value of either FILE_DEVICE_UNKNOWN, or a value within the range of 32768 through 65535.