nohz: Improve a bit the full dynticks Kconfig documentation
[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>
cba3345c 91';' 64-7F linux/vfio.h
cb5a8b2c
RD
92'@' 00-0F linux/radeonfb.h conflict!
93'@' 00-0F drivers/video/aty/aty128fb.c conflict!
94'A' 00-1F linux/apm_bios.h conflict!
95'A' 00-0F linux/agpgart.h conflict!
96 and drivers/char/agp/compat_ioctl.h
97'A' 00-7F sound/asound.h conflict!
98'B' 00-1F linux/cciss_ioctl.h conflict!
99'B' 00-0F include/linux/pmu.h conflict!
1da177e4
LT
100'B' C0-FF advanced bbus
101 <mailto:maassen@uni-freiburg.de>
cb5a8b2c
RD
102'C' all linux/soundcard.h conflict!
103'C' 01-2F linux/capi.h conflict!
104'C' F0-FF drivers/net/wan/cosa.h conflict!
07983f0e 105'D' all arch/s390/include/asm/dasd.h
cb5a8b2c
RD
106'D' 40-5F drivers/scsi/dpt/dtpi_ioctl.h
107'D' 05 drivers/scsi/pmcraid.h
108'E' all linux/input.h conflict!
109'E' 00-0F xen/evtchn.h conflict!
110'F' all linux/fb.h conflict!
111'F' 01-02 drivers/scsi/pmcraid.h conflict!
112'F' 20 drivers/video/fsl-diu-fb.h conflict!
113'F' 20 drivers/video/intelfb/intelfb.h conflict!
114'F' 20 linux/ivtvfb.h conflict!
115'F' 20 linux/matroxfb.h conflict!
116'F' 20 drivers/video/aty/atyfb_base.c conflict!
117'F' 00-0F video/da8xx-fb.h conflict!
118'F' 80-8F linux/arcfb.h conflict!
119'F' DD video/sstfb.h conflict!
120'G' 00-3F drivers/misc/sgi-gru/grulib.h conflict!
121'G' 00-0F linux/gigaset_dev.h conflict!
122'H' 00-7F linux/hiddev.h conflict!
123'H' 00-0F linux/hidraw.h conflict!
4cd7a7e7 124'H' 01 linux/mei.h conflict!
cb5a8b2c
RD
125'H' 00-0F sound/asound.h conflict!
126'H' 20-40 sound/asound_fm.h conflict!
127'H' 80-8F sound/sfnt_info.h conflict!
128'H' 10-8F sound/emu10k1.h conflict!
129'H' 10-1F sound/sb16_csp.h conflict!
130'H' 10-1F sound/hda_hwdep.h conflict!
131'H' 40-4F sound/hdspm.h conflict!
132'H' 40-4F sound/hdsp.h conflict!
133'H' 90 sound/usb/usx2y/usb_stream.h
134'H' C0-F0 net/bluetooth/hci.h conflict!
135'H' C0-DF net/bluetooth/hidp/hidp.h conflict!
136'H' C0-DF net/bluetooth/cmtp/cmtp.h conflict!
137'H' C0-DF net/bluetooth/bnep/bnep.h conflict!
5dc0c983 138'H' F1 linux/hid-roccat.h <mailto:erazor_de@users.sourceforge.net>
cb5a8b2c
RD
139'I' all linux/isdn.h conflict!
140'I' 00-0F drivers/isdn/divert/isdn_divert.h conflict!
141'I' 40-4F linux/mISDNif.h conflict!
1da177e4
LT
142'J' 00-1F drivers/scsi/gdth_ioctl.h
143'K' all linux/kd.h
cb5a8b2c
RD
144'L' 00-1F linux/loop.h conflict!
145'L' 10-1F drivers/scsi/mpt2sas/mpt2sas_ctl.h conflict!
1da177e4
LT
146'L' E0-FF linux/ppdd.h encrypted disk device driver
147 <http://linux01.gwdg.de/~alatham/ppdd.html>
cb5a8b2c
RD
148'M' all linux/soundcard.h conflict!
149'M' 01-16 mtd/mtd-abi.h conflict!
150 and drivers/mtd/mtdchar.c
151'M' 01-03 drivers/scsi/megaraid/megaraid_sas.h
152'M' 00-0F drivers/video/fsl-diu-fb.h conflict!
1da177e4 153'N' 00-1F drivers/usb/scanner.h
b60503ba 154'N' 40-7F drivers/block/nvme.c
cb5a8b2c
RD
155'O' 00-06 mtd/ubi-user.h UBI
156'P' all linux/soundcard.h conflict!
157'P' 60-6F sound/sscape_ioctl.h conflict!
158'P' 00-0F drivers/usb/class/usblp.c conflict!
1da177e4 159'Q' all linux/soundcard.h
cb5a8b2c
RD
160'R' 00-1F linux/random.h conflict!
161'R' 01 linux/rfkill.h conflict!
cb5a8b2c 162'R' C0-DF net/bluetooth/rfcomm.h
1da177e4
LT
163'S' all linux/cdrom.h conflict!
164'S' 80-81 scsi/scsi_ioctl.h conflict!
165'S' 82-FF scsi/scsi.h conflict!
cb5a8b2c 166'S' 00-7F sound/asequencer.h conflict!
1da177e4 167'T' all linux/soundcard.h conflict!
cb5a8b2c 168'T' 00-AF sound/asound.h conflict!
07983f0e 169'T' all arch/x86/include/asm/ioctls.h conflict!
cb5a8b2c
RD
170'T' C0-DF linux/if_tun.h conflict!
171'U' all sound/asound.h conflict!
cb5a8b2c
RD
172'U' 00-CF linux/uinput.h conflict!
173'U' 00-EF linux/usbdevice_fs.h
174'U' C0-CF drivers/bluetooth/hci_uart.h
175'V' all linux/vt.h conflict!
176'V' all linux/videodev2.h conflict!
177'V' C0 linux/ivtvfb.h conflict!
178'V' C0 linux/ivtv.h conflict!
179'V' C0 media/davinci/vpfe_capture.h conflict!
180'V' C0 media/si4713.h conflict!
1da177e4 181'W' 00-1F linux/watchdog.h conflict!
a786a7c0 182'W' 00-1F linux/wanrouter.h conflict! (pre 3.9)
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 205'd' 02-40 pcmcia/ds.h conflict!
1da177e4
LT
206'd' F0-FF linux/digi1.h
207'e' all linux/digi1.h conflict!
cb5a8b2c
RD
208'e' 00-1F drivers/net/irda/irtty-sir.h conflict!
209'f' 00-1F linux/ext2_fs.h conflict!
210'f' 00-1F linux/ext3_fs.h conflict!
211'f' 00-0F fs/jfs/jfs_dinode.h conflict!
212'f' 00-0F fs/ext4/ext4.h conflict!
213'f' 00-0F linux/fs.h conflict!
214'f' 00-0F fs/ocfs2/ocfs2_fs.h conflict!
215'g' 00-0F linux/usb/gadgetfs.h
216'g' 20-2F linux/usb/g_printer.h
217'h' 00-7F conflict! Charon filesystem
1da177e4 218 <mailto:zapman@interlan.net>
cb5a8b2c 219'h' 00-1F linux/hpet.h conflict!
a051f71c 220'h' 80-8F fs/hfsplus/ioctl.c
cb5a8b2c
RD
221'i' 00-3F linux/i2o-dev.h conflict!
222'i' 0B-1F linux/ipmi.h conflict!
223'i' 80-8F linux/i8k.h
1da177e4 224'j' 00-3F linux/joystick.h
cb5a8b2c
RD
225'k' 00-0F linux/spi/spidev.h conflict!
226'k' 00-05 video/kyro.h conflict!
43139a61 227'k' 10-17 linux/hsi/hsi_char.h HSI character device
1da177e4 228'l' 00-3F linux/tcfs_fs.h transparent cryptographic file system
0ea6e611 229 <http://web.archive.org/web/*/http://mikonos.dia.unisa.it/tcfs>
1da177e4 230'l' 40-7F linux/udf_fs_i.h in development:
98766fbe 231 <http://sourceforge.net/projects/linux-udf/>
cb5a8b2c 232'm' 00-09 linux/mmtimer.h conflict!
1da177e4
LT
233'm' all linux/mtio.h conflict!
234'm' all linux/soundcard.h conflict!
235'm' all linux/synclink.h conflict!
cb5a8b2c
RD
236'm' 00-19 drivers/message/fusion/mptctl.h conflict!
237'm' 00 drivers/scsi/megaraid/megaraid_ioctl.h conflict!
1da177e4 238'm' 00-1F net/irda/irmod.h conflict!
cb5a8b2c 239'n' 00-7F linux/ncp_fs.h and fs/ncpfs/ioctl.c
1392e3b3 240'n' 80-8F linux/nilfs2_fs.h NILFS2
cb5a8b2c 241'n' E0-FF linux/matroxfb.h matroxfb
7f68fc28 242'o' 00-1F fs/ocfs2/ocfs2_fs.h OCFS2
cb5a8b2c
RD
243'o' 00-03 mtd/ubi-user.h conflict! (OCFS2 and UBI overlaps)
244'o' 40-41 mtd/ubi-user.h UBI
245'o' 01-A1 linux/dvb/*.h DVB
cef2cf07 246'p' 00-0F linux/phantom.h conflict! (OpenHaptics needs this)
cb5a8b2c 247'p' 00-1F linux/rtc.h conflict!
cef2cf07 248'p' 00-3F linux/mc146818rtc.h conflict!
1da177e4 249'p' 40-7F linux/nvram.h
cb5a8b2c 250'p' 80-9F linux/ppdev.h user-space parport
1da177e4 251 <mailto:tim@cyberelk.net>
717c0336 252'p' A1-A5 linux/pps.h LinuxPPS
eae9d2ba 253 <mailto:giometti@linux.it>
1da177e4 254'q' 00-1F linux/serio.h
cb5a8b2c 255'q' 80-FF linux/telephony.h Internet PhoneJACK, Internet LineJACK
0ea6e611 256 linux/ixjuser.h <http://web.archive.org/web/*/http://www.quicknet.net>
cb5a8b2c 257'r' 00-1F linux/msdos_fs.h and fs/fat/dir.c
1da177e4 258's' all linux/cdk.h
bf7daebb 259't' 00-7F linux/ppp-ioctl.h
1da177e4 260't' 80-8F linux/isdn_ppp.h
cb5a8b2c 261't' 90 linux/toshiba.h
2116b7a4 262'u' 00-1F linux/smb_fs.h gone
5f708812 263'u' 20-3F linux/uvcvideo.h USB video class host driver
cb5a8b2c
RD
264'v' 00-1F linux/ext2_fs.h conflict!
265'v' 00-1F linux/fs.h conflict!
266'v' 00-0F linux/sonypi.h conflict!
cb5a8b2c 267'v' C0-FF linux/meye.h conflict!
1da177e4
LT
268'w' all CERN SCI driver
269'y' 00-1F packet based user level communications
270 <mailto:zapman@interlan.net>
cb5a8b2c 271'z' 00-3F CAN bus card conflict!
1da177e4 272 <mailto:hdstich@connectu.ulm.circular.de>
cb5a8b2c 273'z' 40-7F CAN bus card conflict!
1da177e4 274 <mailto:oe@port.de>
cb5a8b2c 275'z' 10-4F drivers/s390/crypto/zcrypt_api.h conflict!
474966ee 276'|' 00-7F linux/media.h
1da177e4 2770x80 00-1F linux/fb.h
07983f0e 2780x89 00-06 arch/x86/include/asm/sockios.h
1da177e4
LT
2790x89 0B-DF linux/sockios.h
2800x89 E0-EF linux/sockios.h SIOCPROTOPRIVATE range
cb5a8b2c 2810x89 E0-EF linux/dn.h PROTOPRIVATE range
1da177e4
LT
2820x89 F0-FF linux/sockios.h SIOCDEVPRIVATE range
2830x8B all linux/wireless.h
2840x8C 00-3F WiNRADiO driver
0ea6e611 285 <http://www.winradio.com.au/>
1da177e4 2860x90 00 drivers/cdrom/sbpcd.h
cb5a8b2c 2870x92 00-0F drivers/usb/mon/mon_bin.c
1da177e4 2880x93 60-7F linux/auto_fs.h
cb5a8b2c 2890x94 all fs/btrfs/ioctl.h
fc7f99cf 2900x97 00-7F fs/ceph/ioctl.h Ceph file system
1da177e4
LT
2910x99 00-0F 537-Addinboard driver
292 <mailto:buk@buks.ipn.de>
2930xA0 all linux/sdp/sdp.h Industrial Device Project
294 <mailto:kenji@bitgate.com>
ea41b1e5 2950xA2 00-0F arch/tile/include/asm/hardwall.h
1da177e4
LT
2960xA3 80-8F Port ACL in development:
297 <mailto:tlewis@mindspring.com>
2980xA3 90-9F linux/dtlk.h
2990xAB 00-1F linux/nbd.h
3000xAC 00-1F linux/raw.h
3010xAD 00 Netfilter device in development:
cb5a8b2c 302 <mailto:rusty@rustcorp.com.au>
258ac8e0 3030xAE all linux/kvm.h Kernel-based Virtual Machine
0aaeb3b1 304 <mailto:kvm@vger.kernel.org>
6db71994 3050xAF 00-1F linux/fsl_hypervisor.h Freescale hypervisor
1da177e4
LT
3060xB0 all RATIO devices in development:
307 <mailto:vgo@ratio.de>
3080xB1 00-1F PPPoX <mailto:mostrows@styx.uwaterloo.ca>
cb87ea28 3090xB3 00 linux/mmc/ioctl.h
cb5a8b2c 3100xC0 00-0F linux/usb/iowarrior.h
1da177e4
LT
3110xCB 00-1F CBM serial IEC bus in development:
312 <mailto:michael.klein@puffin.lb.shuttle.de>
cb5a8b2c
RD
3130xCD 01 linux/reiserfs_fs.h
3140xCF 02 fs/cifs/ioctl.c
3150xDB 00-0F drivers/char/mwave/mwavepub.h
1da177e4
LT
3160xDD 00-3F ZFCP device driver see drivers/s390/scsi/
317 <mailto:aherrman@de.ibm.com>
cb5a8b2c 3180xF3 00-3F drivers/usb/misc/sisusbvga/sisusb.h sisfb (in development)
1da177e4 319 <mailto:thomas@winischhofer.net>
1ce4d390
RA
3200xF4 00-1F video/mbxfb.h mbxfb
321 <mailto:raph@8d.com>
14d01ff5
MD
3220xF6 all LTTng Linux Trace Toolkit Next Generation
323 <mailto:mathieu.desnoyers@efficios.com>
cb5a8b2c 3240xFD all linux/dm-ioctl.h
This page took 0.634637 seconds and 5 git commands to generate.