Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wirel...
[deliverable/linux.git] / Documentation / ioctl / ioctl-number.txt
CommitLineData
1da177e4
LT
1Ioctl Numbers
219 October 1999
3Michael Elizabeth Chastain
4<mec@shout.net>
5
6If you are adding new ioctl's to the kernel, you should use the _IO
7macros defined in <linux/ioctl.h>:
8
9 _IO an ioctl with no parameters
10 _IOW an ioctl with write parameters (copy_from_user)
11 _IOR an ioctl with read parameters (copy_to_user)
12 _IOWR an ioctl with both write and read parameters.
13
14'Write' and 'read' are from the user's point of view, just like the
15system calls 'write' and 'read'. For example, a SET_FOO ioctl would
16be _IOW, although the kernel would actually read data from user space;
17a GET_FOO ioctl would be _IOR, although the kernel would actually write
18data to user space.
19
20The first argument to _IO, _IOW, _IOR, or _IOWR is an identifying letter
21or number from the table below. Because of the large number of drivers,
22many drivers share a partial letter with other drivers.
23
24If you are writing a driver for a new device and need a letter, pick an
25unused block with enough room for expansion: 32 to 256 ioctl commands.
26You can register the block by patching this file and submitting the
27patch to Linus Torvalds. Or you can e-mail me at <mec@shout.net> and
28I'll register one for you.
29
30The second argument to _IO, _IOW, _IOR, or _IOWR is a sequence number
31to distinguish ioctls from each other. The third argument to _IOW,
32_IOR, or _IOWR is the type of the data going into the kernel or coming
33out of the kernel (e.g. 'int' or 'struct foo'). NOTE! Do NOT use
34sizeof(arg) as the third argument as this results in your ioctl thinking
35it passes an argument of type size_t.
36
37Some devices use their major number as the identifier; this is OK, as
38long as it is unique. Some devices are irregular and don't follow any
39convention at all.
40
41Following this convention is good because:
42
43(1) Keeping the ioctl's globally unique helps error checking:
44 if a program calls an ioctl on the wrong device, it will get an
45 error rather than some unexpected behaviour.
46
47(2) The 'strace' build procedure automatically finds ioctl numbers
48 defined with _IO, _IOW, _IOR, or _IOWR.
49
50(3) 'strace' can decode numbers back into useful names when the
51 numbers are unique.
52
53(4) People looking for ioctls can grep for them more easily when
54 this convention is used to define the ioctl numbers.
55
56(5) When following the convention, the driver code can use generic
57 code to copy the parameters between user and kernel space.
58
cb5a8b2c
RD
59This table lists ioctls visible from user land for Linux/x86. It contains
60most drivers up to 2.6.31, but I know I am missing some. There has been
61no attempt to list non-X86 architectures or ioctls from drivers/staging/.
1da177e4 62
cb5a8b2c 63Code Seq#(hex) Include File Comments
1da177e4
LT
64========================================================
650x00 00-1F linux/fs.h conflict!
660x00 00-1F scsi/scsi_ioctl.h conflict!
670x00 00-1F linux/fb.h conflict!
680x00 00-1F linux/wavefront.h conflict!
690x02 all linux/fd.h
700x03 all linux/hdreg.h
d5298802 710x04 D2-DC linux/umsdos_fs.h Dead since 2.6.11, but don't reuse these.
1da177e4 720x06 all linux/lp.h
cb5a8b2c
RD
730x09 all linux/raid/md_u.h
740x10 00-0F drivers/char/s390/vmcp.h
1da177e4
LT
750x12 all linux/fs.h
76 linux/blkpg.h
0ea6e611 770x1b all InfiniBand Subsystem <http://infiniband.sourceforge.net/>
1da177e4
LT
780x20 all drivers/cdrom/cm206.h
790x22 all scsi/sg.h
80'#' 00-3F IEEE 1394 Subsystem Block for the entire subsystem
cb5a8b2c 81'$' 00-0F linux/perf_counter.h, linux/perf_event.h
aed69d2b 82'&' 00-07 drivers/firewire/nosy-user.h
1da177e4
LT
83'1' 00-1F <linux/timepps.h> PPS kit from Ulrich Windl
84 <ftp://ftp.de.kernel.org/pub/linux/daemons/ntp/PPS/>
cb5a8b2c
RD
85'2' 01-04 linux/i2o.h
86'3' 00-0F drivers/s390/char/raw3270.h conflict!
87'3' 00-1F linux/suspend_ioctls.h conflict!
88 and kernel/power/user.c
1da177e4
LT
89'8' all SNP8023 advanced NIC card
90 <mailto:mcr@solidum.com>
cb5a8b2c
RD
91'@' 00-0F linux/radeonfb.h conflict!
92'@' 00-0F drivers/video/aty/aty128fb.c conflict!
93'A' 00-1F linux/apm_bios.h conflict!
94'A' 00-0F linux/agpgart.h conflict!
95 and drivers/char/agp/compat_ioctl.h
96'A' 00-7F sound/asound.h conflict!
97'B' 00-1F linux/cciss_ioctl.h conflict!
98'B' 00-0F include/linux/pmu.h conflict!
1da177e4
LT
99'B' C0-FF advanced bbus
100 <mailto:maassen@uni-freiburg.de>
cb5a8b2c
RD
101'C' all linux/soundcard.h conflict!
102'C' 01-2F linux/capi.h conflict!
103'C' F0-FF drivers/net/wan/cosa.h conflict!
07983f0e 104'D' all arch/s390/include/asm/dasd.h
cb5a8b2c
RD
105'D' 40-5F drivers/scsi/dpt/dtpi_ioctl.h
106'D' 05 drivers/scsi/pmcraid.h
107'E' all linux/input.h conflict!
108'E' 00-0F xen/evtchn.h conflict!
109'F' all linux/fb.h conflict!
110'F' 01-02 drivers/scsi/pmcraid.h conflict!
111'F' 20 drivers/video/fsl-diu-fb.h conflict!
112'F' 20 drivers/video/intelfb/intelfb.h conflict!
113'F' 20 linux/ivtvfb.h conflict!
114'F' 20 linux/matroxfb.h conflict!
115'F' 20 drivers/video/aty/atyfb_base.c conflict!
116'F' 00-0F video/da8xx-fb.h conflict!
117'F' 80-8F linux/arcfb.h conflict!
118'F' DD video/sstfb.h conflict!
119'G' 00-3F drivers/misc/sgi-gru/grulib.h conflict!
120'G' 00-0F linux/gigaset_dev.h conflict!
121'H' 00-7F linux/hiddev.h conflict!
122'H' 00-0F linux/hidraw.h conflict!
4cd7a7e7 123'H' 01 linux/mei.h conflict!
cb5a8b2c
RD
124'H' 00-0F sound/asound.h conflict!
125'H' 20-40 sound/asound_fm.h conflict!
126'H' 80-8F sound/sfnt_info.h conflict!
127'H' 10-8F sound/emu10k1.h conflict!
128'H' 10-1F sound/sb16_csp.h conflict!
129'H' 10-1F sound/hda_hwdep.h conflict!
130'H' 40-4F sound/hdspm.h conflict!
131'H' 40-4F sound/hdsp.h conflict!
132'H' 90 sound/usb/usx2y/usb_stream.h
133'H' C0-F0 net/bluetooth/hci.h conflict!
134'H' C0-DF net/bluetooth/hidp/hidp.h conflict!
135'H' C0-DF net/bluetooth/cmtp/cmtp.h conflict!
136'H' C0-DF net/bluetooth/bnep/bnep.h conflict!
5dc0c983 137'H' F1 linux/hid-roccat.h <mailto:erazor_de@users.sourceforge.net>
cb5a8b2c
RD
138'I' all linux/isdn.h conflict!
139'I' 00-0F drivers/isdn/divert/isdn_divert.h conflict!
140'I' 40-4F linux/mISDNif.h conflict!
1da177e4
LT
141'J' 00-1F drivers/scsi/gdth_ioctl.h
142'K' all linux/kd.h
cb5a8b2c
RD
143'L' 00-1F linux/loop.h conflict!
144'L' 10-1F drivers/scsi/mpt2sas/mpt2sas_ctl.h conflict!
1da177e4
LT
145'L' E0-FF linux/ppdd.h encrypted disk device driver
146 <http://linux01.gwdg.de/~alatham/ppdd.html>
cb5a8b2c
RD
147'M' all linux/soundcard.h conflict!
148'M' 01-16 mtd/mtd-abi.h conflict!
149 and drivers/mtd/mtdchar.c
150'M' 01-03 drivers/scsi/megaraid/megaraid_sas.h
151'M' 00-0F drivers/video/fsl-diu-fb.h conflict!
1da177e4 152'N' 00-1F drivers/usb/scanner.h
b60503ba 153'N' 40-7F drivers/block/nvme.c
cb5a8b2c
RD
154'O' 00-06 mtd/ubi-user.h UBI
155'P' all linux/soundcard.h conflict!
156'P' 60-6F sound/sscape_ioctl.h conflict!
157'P' 00-0F drivers/usb/class/usblp.c conflict!
1da177e4 158'Q' all linux/soundcard.h
cb5a8b2c
RD
159'R' 00-1F linux/random.h conflict!
160'R' 01 linux/rfkill.h conflict!
cb5a8b2c 161'R' C0-DF net/bluetooth/rfcomm.h
1da177e4
LT
162'S' all linux/cdrom.h conflict!
163'S' 80-81 scsi/scsi_ioctl.h conflict!
164'S' 82-FF scsi/scsi.h conflict!
cb5a8b2c 165'S' 00-7F sound/asequencer.h conflict!
1da177e4 166'T' all linux/soundcard.h conflict!
cb5a8b2c 167'T' 00-AF sound/asound.h conflict!
07983f0e 168'T' all arch/x86/include/asm/ioctls.h conflict!
cb5a8b2c
RD
169'T' C0-DF linux/if_tun.h conflict!
170'U' all sound/asound.h conflict!
cb5a8b2c
RD
171'U' 00-CF linux/uinput.h conflict!
172'U' 00-EF linux/usbdevice_fs.h
173'U' C0-CF drivers/bluetooth/hci_uart.h
174'V' all linux/vt.h conflict!
175'V' all linux/videodev2.h conflict!
176'V' C0 linux/ivtvfb.h conflict!
177'V' C0 linux/ivtv.h conflict!
178'V' C0 media/davinci/vpfe_capture.h conflict!
179'V' C0 media/si4713.h conflict!
180'V' C0-CF drivers/media/video/mxb.h conflict!
1da177e4
LT
181'W' 00-1F linux/watchdog.h conflict!
182'W' 00-1F linux/wanrouter.h conflict!
cb5a8b2c
RD
183'W' 00-3F sound/asound.h conflict!
184'X' all fs/xfs/xfs_fs.h conflict!
185 and fs/xfs/linux-2.6/xfs_ioctl32.h
186 and include/linux/falloc.h
187 and linux/fs.h
188'X' all fs/ocfs2/ocfs_fs.h conflict!
189'X' 01 linux/pktcdvd.h conflict!
1da177e4 190'Y' all linux/cyclades.h
cb5a8b2c
RD
191'Z' 14-15 drivers/message/fusion/mptctl.h
192'[' 00-07 linux/usb/tmc.h USB Test and Measurement Devices
bc5bca53 193 <mailto:gregkh@linuxfoundation.org>
cb5a8b2c 194'a' all linux/atm*.h, linux/sonet.h ATM on linux
0ea6e611 195 <http://lrcwww.epfl.ch/>
cb5a8b2c 196'b' 00-FF conflict! bit3 vme host bridge
1da177e4 197 <mailto:natalia@nikhefk.nikhef.nl>
cb5a8b2c 198'c' all linux/cm4000_cs.h conflict!
1da177e4
LT
199'c' 00-7F linux/comstats.h conflict!
200'c' 00-7F linux/coda.h conflict!
cb5a8b2c
RD
201'c' 00-1F linux/chio.h conflict!
202'c' 80-9F arch/s390/include/asm/chsc.h conflict!
203'c' A0-AF arch/x86/include/asm/msr.h conflict!
1da177e4 204'd' 00-FF linux/char/drm/drm/h conflict!
cb5a8b2c
RD
205'd' 02-40 pcmcia/ds.h conflict!
206'd' 10-3F drivers/media/video/dabusb.h conflict!
207'd' C0-CF drivers/media/video/saa7191.h conflict!
1da177e4
LT
208'd' F0-FF linux/digi1.h
209'e' all linux/digi1.h conflict!
cb5a8b2c
RD
210'e' 00-1F drivers/net/irda/irtty-sir.h conflict!
211'f' 00-1F linux/ext2_fs.h conflict!
212'f' 00-1F linux/ext3_fs.h conflict!
213'f' 00-0F fs/jfs/jfs_dinode.h conflict!
214'f' 00-0F fs/ext4/ext4.h conflict!
215'f' 00-0F linux/fs.h conflict!
216'f' 00-0F fs/ocfs2/ocfs2_fs.h conflict!
217'g' 00-0F linux/usb/gadgetfs.h
218'g' 20-2F linux/usb/g_printer.h
219'h' 00-7F conflict! Charon filesystem
1da177e4 220 <mailto:zapman@interlan.net>
cb5a8b2c 221'h' 00-1F linux/hpet.h conflict!
a051f71c 222'h' 80-8F fs/hfsplus/ioctl.c
cb5a8b2c
RD
223'i' 00-3F linux/i2o-dev.h conflict!
224'i' 0B-1F linux/ipmi.h conflict!
225'i' 80-8F linux/i8k.h
1da177e4 226'j' 00-3F linux/joystick.h
cb5a8b2c
RD
227'k' 00-0F linux/spi/spidev.h conflict!
228'k' 00-05 video/kyro.h conflict!
43139a61 229'k' 10-17 linux/hsi/hsi_char.h HSI character device
1da177e4 230'l' 00-3F linux/tcfs_fs.h transparent cryptographic file system
0ea6e611 231 <http://web.archive.org/web/*/http://mikonos.dia.unisa.it/tcfs>
1da177e4 232'l' 40-7F linux/udf_fs_i.h in development:
98766fbe 233 <http://sourceforge.net/projects/linux-udf/>
cb5a8b2c 234'm' 00-09 linux/mmtimer.h conflict!
1da177e4
LT
235'm' all linux/mtio.h conflict!
236'm' all linux/soundcard.h conflict!
237'm' all linux/synclink.h conflict!
cb5a8b2c
RD
238'm' 00-19 drivers/message/fusion/mptctl.h conflict!
239'm' 00 drivers/scsi/megaraid/megaraid_ioctl.h conflict!
1da177e4 240'm' 00-1F net/irda/irmod.h conflict!
cb5a8b2c 241'n' 00-7F linux/ncp_fs.h and fs/ncpfs/ioctl.c
1392e3b3 242'n' 80-8F linux/nilfs2_fs.h NILFS2
cb5a8b2c 243'n' E0-FF linux/matroxfb.h matroxfb
7f68fc28 244'o' 00-1F fs/ocfs2/ocfs2_fs.h OCFS2
cb5a8b2c
RD
245'o' 00-03 mtd/ubi-user.h conflict! (OCFS2 and UBI overlaps)
246'o' 40-41 mtd/ubi-user.h UBI
247'o' 01-A1 linux/dvb/*.h DVB
cef2cf07 248'p' 00-0F linux/phantom.h conflict! (OpenHaptics needs this)
cb5a8b2c 249'p' 00-1F linux/rtc.h conflict!
cef2cf07 250'p' 00-3F linux/mc146818rtc.h conflict!
1da177e4 251'p' 40-7F linux/nvram.h
cb5a8b2c 252'p' 80-9F linux/ppdev.h user-space parport
1da177e4 253 <mailto:tim@cyberelk.net>
717c0336 254'p' A1-A5 linux/pps.h LinuxPPS
eae9d2ba 255 <mailto:giometti@linux.it>
1da177e4 256'q' 00-1F linux/serio.h
cb5a8b2c 257'q' 80-FF linux/telephony.h Internet PhoneJACK, Internet LineJACK
0ea6e611 258 linux/ixjuser.h <http://web.archive.org/web/*/http://www.quicknet.net>
cb5a8b2c 259'r' 00-1F linux/msdos_fs.h and fs/fat/dir.c
1da177e4 260's' all linux/cdk.h
bf7daebb 261't' 00-7F linux/ppp-ioctl.h
1da177e4 262't' 80-8F linux/isdn_ppp.h
cb5a8b2c 263't' 90 linux/toshiba.h
2116b7a4 264'u' 00-1F linux/smb_fs.h gone
5f708812 265'u' 20-3F linux/uvcvideo.h USB video class host driver
cb5a8b2c
RD
266'v' 00-1F linux/ext2_fs.h conflict!
267'v' 00-1F linux/fs.h conflict!
268'v' 00-0F linux/sonypi.h conflict!
cb5a8b2c
RD
269'v' C0-DF media/pwc-ioctl.h conflict!
270'v' C0-FF linux/meye.h conflict!
cb5a8b2c 271'v' D0-DF drivers/media/video/cpia2/cpia2dev.h conflict!
1da177e4
LT
272'w' all CERN SCI driver
273'y' 00-1F packet based user level communications
274 <mailto:zapman@interlan.net>
cb5a8b2c 275'z' 00-3F CAN bus card conflict!
1da177e4 276 <mailto:hdstich@connectu.ulm.circular.de>
cb5a8b2c 277'z' 40-7F CAN bus card conflict!
1da177e4 278 <mailto:oe@port.de>
cb5a8b2c 279'z' 10-4F drivers/s390/crypto/zcrypt_api.h conflict!
474966ee 280'|' 00-7F linux/media.h
1da177e4 2810x80 00-1F linux/fb.h
07983f0e 2820x89 00-06 arch/x86/include/asm/sockios.h
1da177e4
LT
2830x89 0B-DF linux/sockios.h
2840x89 E0-EF linux/sockios.h SIOCPROTOPRIVATE range
cb5a8b2c 2850x89 E0-EF linux/dn.h PROTOPRIVATE range
1da177e4
LT
2860x89 F0-FF linux/sockios.h SIOCDEVPRIVATE range
2870x8B all linux/wireless.h
2880x8C 00-3F WiNRADiO driver
0ea6e611 289 <http://www.winradio.com.au/>
1da177e4 2900x90 00 drivers/cdrom/sbpcd.h
cb5a8b2c 2910x92 00-0F drivers/usb/mon/mon_bin.c
1da177e4 2920x93 60-7F linux/auto_fs.h
cb5a8b2c 2930x94 all fs/btrfs/ioctl.h
fc7f99cf 2940x97 00-7F fs/ceph/ioctl.h Ceph file system
1da177e4
LT
2950x99 00-0F 537-Addinboard driver
296 <mailto:buk@buks.ipn.de>
2970xA0 all linux/sdp/sdp.h Industrial Device Project
298 <mailto:kenji@bitgate.com>
ea41b1e5 2990xA2 00-0F arch/tile/include/asm/hardwall.h
1da177e4
LT
3000xA3 80-8F Port ACL in development:
301 <mailto:tlewis@mindspring.com>
3020xA3 90-9F linux/dtlk.h
3030xAB 00-1F linux/nbd.h
3040xAC 00-1F linux/raw.h
3050xAD 00 Netfilter device in development:
cb5a8b2c 306 <mailto:rusty@rustcorp.com.au>
258ac8e0 3070xAE all linux/kvm.h Kernel-based Virtual Machine
0aaeb3b1 308 <mailto:kvm@vger.kernel.org>
6db71994 3090xAF 00-1F linux/fsl_hypervisor.h Freescale hypervisor
1da177e4
LT
3100xB0 all RATIO devices in development:
311 <mailto:vgo@ratio.de>
3120xB1 00-1F PPPoX <mailto:mostrows@styx.uwaterloo.ca>
cb87ea28 3130xB3 00 linux/mmc/ioctl.h
cb5a8b2c 3140xC0 00-0F linux/usb/iowarrior.h
1da177e4
LT
3150xCB 00-1F CBM serial IEC bus in development:
316 <mailto:michael.klein@puffin.lb.shuttle.de>
cb5a8b2c
RD
3170xCD 01 linux/reiserfs_fs.h
3180xCF 02 fs/cifs/ioctl.c
3190xDB 00-0F drivers/char/mwave/mwavepub.h
1da177e4
LT
3200xDD 00-3F ZFCP device driver see drivers/s390/scsi/
321 <mailto:aherrman@de.ibm.com>
cb5a8b2c 3220xF3 00-3F drivers/usb/misc/sisusbvga/sisusb.h sisfb (in development)
1da177e4 323 <mailto:thomas@winischhofer.net>
1ce4d390
RA
3240xF4 00-1F video/mbxfb.h mbxfb
325 <mailto:raph@8d.com>
14d01ff5
MD
3260xF6 all LTTng Linux Trace Toolkit Next Generation
327 <mailto:mathieu.desnoyers@efficios.com>
cb5a8b2c 3280xFD all linux/dm-ioctl.h
This page took 0.525474 seconds and 5 git commands to generate.