Merge branch 'next' into for-linus
[deliverable/linux.git] / Documentation / ioctl / ioctl-number.txt
CommitLineData
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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
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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
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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
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730x09 all linux/raid/md_u.h
740x10 00-0F drivers/char/s390/vmcp.h
d475f942 750x10 10-1F arch/s390/include/uapi/sclp_ctl.h
07be0382 760x10 20-2F arch/s390/include/uapi/asm/hypfs.h
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770x12 all linux/fs.h
78 linux/blkpg.h
0ea6e611 790x1b all InfiniBand Subsystem <http://infiniband.sourceforge.net/>
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800x20 all drivers/cdrom/cm206.h
810x22 all scsi/sg.h
82'#' 00-3F IEEE 1394 Subsystem Block for the entire subsystem
cb5a8b2c 83'$' 00-0F linux/perf_counter.h, linux/perf_event.h
aed69d2b 84'&' 00-07 drivers/firewire/nosy-user.h
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85'1' 00-1F <linux/timepps.h> PPS kit from Ulrich Windl
86 <ftp://ftp.de.kernel.org/pub/linux/daemons/ntp/PPS/>
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87'2' 01-04 linux/i2o.h
88'3' 00-0F drivers/s390/char/raw3270.h conflict!
89'3' 00-1F linux/suspend_ioctls.h conflict!
90 and kernel/power/user.c
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91'8' all SNP8023 advanced NIC card
92 <mailto:mcr@solidum.com>
cba3345c 93';' 64-7F linux/vfio.h
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94'@' 00-0F linux/radeonfb.h conflict!
95'@' 00-0F drivers/video/aty/aty128fb.c conflict!
96'A' 00-1F linux/apm_bios.h conflict!
97'A' 00-0F linux/agpgart.h conflict!
98 and drivers/char/agp/compat_ioctl.h
99'A' 00-7F sound/asound.h conflict!
100'B' 00-1F linux/cciss_ioctl.h conflict!
101'B' 00-0F include/linux/pmu.h conflict!
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102'B' C0-FF advanced bbus
103 <mailto:maassen@uni-freiburg.de>
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104'C' all linux/soundcard.h conflict!
105'C' 01-2F linux/capi.h conflict!
106'C' F0-FF drivers/net/wan/cosa.h conflict!
07983f0e 107'D' all arch/s390/include/asm/dasd.h
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108'D' 40-5F drivers/scsi/dpt/dtpi_ioctl.h
109'D' 05 drivers/scsi/pmcraid.h
110'E' all linux/input.h conflict!
111'E' 00-0F xen/evtchn.h conflict!
112'F' all linux/fb.h conflict!
113'F' 01-02 drivers/scsi/pmcraid.h conflict!
114'F' 20 drivers/video/fsl-diu-fb.h conflict!
115'F' 20 drivers/video/intelfb/intelfb.h conflict!
116'F' 20 linux/ivtvfb.h conflict!
117'F' 20 linux/matroxfb.h conflict!
118'F' 20 drivers/video/aty/atyfb_base.c conflict!
119'F' 00-0F video/da8xx-fb.h conflict!
120'F' 80-8F linux/arcfb.h conflict!
121'F' DD video/sstfb.h conflict!
122'G' 00-3F drivers/misc/sgi-gru/grulib.h conflict!
123'G' 00-0F linux/gigaset_dev.h conflict!
124'H' 00-7F linux/hiddev.h conflict!
125'H' 00-0F linux/hidraw.h conflict!
4cd7a7e7 126'H' 01 linux/mei.h conflict!
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127'H' 00-0F sound/asound.h conflict!
128'H' 20-40 sound/asound_fm.h conflict!
129'H' 80-8F sound/sfnt_info.h conflict!
130'H' 10-8F sound/emu10k1.h conflict!
131'H' 10-1F sound/sb16_csp.h conflict!
132'H' 10-1F sound/hda_hwdep.h conflict!
133'H' 40-4F sound/hdspm.h conflict!
134'H' 40-4F sound/hdsp.h conflict!
135'H' 90 sound/usb/usx2y/usb_stream.h
3edce1cf 136'H' A0 uapi/linux/usb/cdc-wdm.h
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137'H' C0-F0 net/bluetooth/hci.h conflict!
138'H' C0-DF net/bluetooth/hidp/hidp.h conflict!
139'H' C0-DF net/bluetooth/cmtp/cmtp.h conflict!
140'H' C0-DF net/bluetooth/bnep/bnep.h conflict!
5dc0c983 141'H' F1 linux/hid-roccat.h <mailto:erazor_de@users.sourceforge.net>
82fbb4f7 142'H' F8-FA sound/firewire.h
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143'I' all linux/isdn.h conflict!
144'I' 00-0F drivers/isdn/divert/isdn_divert.h conflict!
145'I' 40-4F linux/mISDNif.h conflict!
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146'J' 00-1F drivers/scsi/gdth_ioctl.h
147'K' all linux/kd.h
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148'L' 00-1F linux/loop.h conflict!
149'L' 10-1F drivers/scsi/mpt2sas/mpt2sas_ctl.h conflict!
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150'L' E0-FF linux/ppdd.h encrypted disk device driver
151 <http://linux01.gwdg.de/~alatham/ppdd.html>
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152'M' all linux/soundcard.h conflict!
153'M' 01-16 mtd/mtd-abi.h conflict!
154 and drivers/mtd/mtdchar.c
155'M' 01-03 drivers/scsi/megaraid/megaraid_sas.h
156'M' 00-0F drivers/video/fsl-diu-fb.h conflict!
1da177e4 157'N' 00-1F drivers/usb/scanner.h
b60503ba 158'N' 40-7F drivers/block/nvme.c
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159'O' 00-06 mtd/ubi-user.h UBI
160'P' all linux/soundcard.h conflict!
161'P' 60-6F sound/sscape_ioctl.h conflict!
162'P' 00-0F drivers/usb/class/usblp.c conflict!
1da177e4 163'Q' all linux/soundcard.h
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164'R' 00-1F linux/random.h conflict!
165'R' 01 linux/rfkill.h conflict!
cb5a8b2c 166'R' C0-DF net/bluetooth/rfcomm.h
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167'S' all linux/cdrom.h conflict!
168'S' 80-81 scsi/scsi_ioctl.h conflict!
169'S' 82-FF scsi/scsi.h conflict!
cb5a8b2c 170'S' 00-7F sound/asequencer.h conflict!
1da177e4 171'T' all linux/soundcard.h conflict!
cb5a8b2c 172'T' 00-AF sound/asound.h conflict!
07983f0e 173'T' all arch/x86/include/asm/ioctls.h conflict!
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174'T' C0-DF linux/if_tun.h conflict!
175'U' all sound/asound.h conflict!
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176'U' 00-CF linux/uinput.h conflict!
177'U' 00-EF linux/usbdevice_fs.h
178'U' C0-CF drivers/bluetooth/hci_uart.h
179'V' all linux/vt.h conflict!
180'V' all linux/videodev2.h conflict!
181'V' C0 linux/ivtvfb.h conflict!
182'V' C0 linux/ivtv.h conflict!
183'V' C0 media/davinci/vpfe_capture.h conflict!
184'V' C0 media/si4713.h conflict!
1da177e4 185'W' 00-1F linux/watchdog.h conflict!
a786a7c0 186'W' 00-1F linux/wanrouter.h conflict! (pre 3.9)
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187'W' 00-3F sound/asound.h conflict!
188'X' all fs/xfs/xfs_fs.h conflict!
189 and fs/xfs/linux-2.6/xfs_ioctl32.h
190 and include/linux/falloc.h
191 and linux/fs.h
192'X' all fs/ocfs2/ocfs_fs.h conflict!
193'X' 01 linux/pktcdvd.h conflict!
1da177e4 194'Y' all linux/cyclades.h
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195'Z' 14-15 drivers/message/fusion/mptctl.h
196'[' 00-07 linux/usb/tmc.h USB Test and Measurement Devices
bc5bca53 197 <mailto:gregkh@linuxfoundation.org>
cb5a8b2c 198'a' all linux/atm*.h, linux/sonet.h ATM on linux
0ea6e611 199 <http://lrcwww.epfl.ch/>
cea4001a 200'a' 00-0F drivers/crypto/qat/qat_common/adf_cfg_common.h conflict! qat driver
cb5a8b2c 201'b' 00-FF conflict! bit3 vme host bridge
1da177e4 202 <mailto:natalia@nikhefk.nikhef.nl>
cb5a8b2c 203'c' all linux/cm4000_cs.h conflict!
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204'c' 00-7F linux/comstats.h conflict!
205'c' 00-7F linux/coda.h conflict!
cb5a8b2c
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206'c' 00-1F linux/chio.h conflict!
207'c' 80-9F arch/s390/include/asm/chsc.h conflict!
208'c' A0-AF arch/x86/include/asm/msr.h conflict!
1da177e4 209'd' 00-FF linux/char/drm/drm/h conflict!
cb5a8b2c 210'd' 02-40 pcmcia/ds.h conflict!
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211'd' F0-FF linux/digi1.h
212'e' all linux/digi1.h conflict!
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213'e' 00-1F drivers/net/irda/irtty-sir.h conflict!
214'f' 00-1F linux/ext2_fs.h conflict!
215'f' 00-1F linux/ext3_fs.h conflict!
216'f' 00-0F fs/jfs/jfs_dinode.h conflict!
217'f' 00-0F fs/ext4/ext4.h conflict!
218'f' 00-0F linux/fs.h conflict!
219'f' 00-0F fs/ocfs2/ocfs2_fs.h conflict!
220'g' 00-0F linux/usb/gadgetfs.h
221'g' 20-2F linux/usb/g_printer.h
222'h' 00-7F conflict! Charon filesystem
1da177e4 223 <mailto:zapman@interlan.net>
cb5a8b2c 224'h' 00-1F linux/hpet.h conflict!
a051f71c 225'h' 80-8F fs/hfsplus/ioctl.c
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226'i' 00-3F linux/i2o-dev.h conflict!
227'i' 0B-1F linux/ipmi.h conflict!
228'i' 80-8F linux/i8k.h
1da177e4 229'j' 00-3F linux/joystick.h
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230'k' 00-0F linux/spi/spidev.h conflict!
231'k' 00-05 video/kyro.h conflict!
43139a61 232'k' 10-17 linux/hsi/hsi_char.h HSI character device
1da177e4 233'l' 00-3F linux/tcfs_fs.h transparent cryptographic file system
0ea6e611 234 <http://web.archive.org/web/*/http://mikonos.dia.unisa.it/tcfs>
1da177e4 235'l' 40-7F linux/udf_fs_i.h in development:
98766fbe 236 <http://sourceforge.net/projects/linux-udf/>
cb5a8b2c 237'm' 00-09 linux/mmtimer.h conflict!
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238'm' all linux/mtio.h conflict!
239'm' all linux/soundcard.h conflict!
240'm' all linux/synclink.h conflict!
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241'm' 00-19 drivers/message/fusion/mptctl.h conflict!
242'm' 00 drivers/scsi/megaraid/megaraid_ioctl.h conflict!
1da177e4 243'm' 00-1F net/irda/irmod.h conflict!
cb5a8b2c 244'n' 00-7F linux/ncp_fs.h and fs/ncpfs/ioctl.c
1392e3b3 245'n' 80-8F linux/nilfs2_fs.h NILFS2
cb5a8b2c 246'n' E0-FF linux/matroxfb.h matroxfb
7f68fc28 247'o' 00-1F fs/ocfs2/ocfs2_fs.h OCFS2
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248'o' 00-03 mtd/ubi-user.h conflict! (OCFS2 and UBI overlaps)
249'o' 40-41 mtd/ubi-user.h UBI
250'o' 01-A1 linux/dvb/*.h DVB
cef2cf07 251'p' 00-0F linux/phantom.h conflict! (OpenHaptics needs this)
cb5a8b2c 252'p' 00-1F linux/rtc.h conflict!
cef2cf07 253'p' 00-3F linux/mc146818rtc.h conflict!
1da177e4 254'p' 40-7F linux/nvram.h
cb5a8b2c 255'p' 80-9F linux/ppdev.h user-space parport
1da177e4 256 <mailto:tim@cyberelk.net>
717c0336 257'p' A1-A5 linux/pps.h LinuxPPS
eae9d2ba 258 <mailto:giometti@linux.it>
1da177e4 259'q' 00-1F linux/serio.h
cb5a8b2c 260'q' 80-FF linux/telephony.h Internet PhoneJACK, Internet LineJACK
0ea6e611 261 linux/ixjuser.h <http://web.archive.org/web/*/http://www.quicknet.net>
cb5a8b2c 262'r' 00-1F linux/msdos_fs.h and fs/fat/dir.c
1da177e4 263's' all linux/cdk.h
bf7daebb 264't' 00-7F linux/ppp-ioctl.h
1da177e4 265't' 80-8F linux/isdn_ppp.h
cb5a8b2c 266't' 90 linux/toshiba.h
2116b7a4 267'u' 00-1F linux/smb_fs.h gone
5f708812 268'u' 20-3F linux/uvcvideo.h USB video class host driver
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269'v' 00-1F linux/ext2_fs.h conflict!
270'v' 00-1F linux/fs.h conflict!
271'v' 00-0F linux/sonypi.h conflict!
cb5a8b2c 272'v' C0-FF linux/meye.h conflict!
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273'w' all CERN SCI driver
274'y' 00-1F packet based user level communications
275 <mailto:zapman@interlan.net>
cb5a8b2c 276'z' 00-3F CAN bus card conflict!
1da177e4 277 <mailto:hdstich@connectu.ulm.circular.de>
cb5a8b2c 278'z' 40-7F CAN bus card conflict!
1da177e4 279 <mailto:oe@port.de>
cb5a8b2c 280'z' 10-4F drivers/s390/crypto/zcrypt_api.h conflict!
474966ee 281'|' 00-7F linux/media.h
1da177e4 2820x80 00-1F linux/fb.h
07983f0e 2830x89 00-06 arch/x86/include/asm/sockios.h
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2840x89 0B-DF linux/sockios.h
2850x89 E0-EF linux/sockios.h SIOCPROTOPRIVATE range
cb5a8b2c 2860x89 E0-EF linux/dn.h PROTOPRIVATE range
1da177e4
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2870x89 F0-FF linux/sockios.h SIOCDEVPRIVATE range
2880x8B all linux/wireless.h
2890x8C 00-3F WiNRADiO driver
0ea6e611 290 <http://www.winradio.com.au/>
1da177e4 2910x90 00 drivers/cdrom/sbpcd.h
cb5a8b2c 2920x92 00-0F drivers/usb/mon/mon_bin.c
1da177e4 2930x93 60-7F linux/auto_fs.h
cb5a8b2c 2940x94 all fs/btrfs/ioctl.h
fc7f99cf 2950x97 00-7F fs/ceph/ioctl.h Ceph file system
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2960x99 00-0F 537-Addinboard driver
297 <mailto:buk@buks.ipn.de>
2980xA0 all linux/sdp/sdp.h Industrial Device Project
299 <mailto:kenji@bitgate.com>
ea41b1e5 3000xA2 00-0F arch/tile/include/asm/hardwall.h
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3010xA3 80-8F Port ACL in development:
302 <mailto:tlewis@mindspring.com>
3030xA3 90-9F linux/dtlk.h
3040xAB 00-1F linux/nbd.h
3050xAC 00-1F linux/raw.h
3060xAD 00 Netfilter device in development:
cb5a8b2c 307 <mailto:rusty@rustcorp.com.au>
258ac8e0 3080xAE all linux/kvm.h Kernel-based Virtual Machine
0aaeb3b1 309 <mailto:kvm@vger.kernel.org>
6db71994 3100xAF 00-1F linux/fsl_hypervisor.h Freescale hypervisor
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3110xB0 all RATIO devices in development:
312 <mailto:vgo@ratio.de>
3130xB1 00-1F PPPoX <mailto:mostrows@styx.uwaterloo.ca>
cb87ea28 3140xB3 00 linux/mmc/ioctl.h
cb5a8b2c 3150xC0 00-0F linux/usb/iowarrior.h
a9282d01 3160xCA 00-0F uapi/misc/cxl.h
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3170xCB 00-1F CBM serial IEC bus in development:
318 <mailto:michael.klein@puffin.lb.shuttle.de>
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3190xCD 01 linux/reiserfs_fs.h
3200xCF 02 fs/cifs/ioctl.c
3210xDB 00-0F drivers/char/mwave/mwavepub.h
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3220xDD 00-3F ZFCP device driver see drivers/s390/scsi/
323 <mailto:aherrman@de.ibm.com>
00c570f4 3240xE5 00-3F linux/fuse.h
e7c256fb 3250xEC 00-01 drivers/platform/chrome/cros_ec_dev.h ChromeOS EC driver
cb5a8b2c 3260xF3 00-3F drivers/usb/misc/sisusbvga/sisusb.h sisfb (in development)
1da177e4 327 <mailto:thomas@winischhofer.net>
1ce4d390
RA
3280xF4 00-1F video/mbxfb.h mbxfb
329 <mailto:raph@8d.com>
14d01ff5
MD
3300xF6 all LTTng Linux Trace Toolkit Next Generation
331 <mailto:mathieu.desnoyers@efficios.com>
cb5a8b2c 3320xFD all linux/dm-ioctl.h
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