ALSA: add DICE driver
[deliverable/linux.git] / Documentation / ioctl / ioctl-number.txt
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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
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760x12 all linux/fs.h
77 linux/blkpg.h
0ea6e611 780x1b all InfiniBand Subsystem <http://infiniband.sourceforge.net/>
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790x20 all drivers/cdrom/cm206.h
800x22 all scsi/sg.h
81'#' 00-3F IEEE 1394 Subsystem Block for the entire subsystem
cb5a8b2c 82'$' 00-0F linux/perf_counter.h, linux/perf_event.h
aed69d2b 83'&' 00-07 drivers/firewire/nosy-user.h
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84'1' 00-1F <linux/timepps.h> PPS kit from Ulrich Windl
85 <ftp://ftp.de.kernel.org/pub/linux/daemons/ntp/PPS/>
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86'2' 01-04 linux/i2o.h
87'3' 00-0F drivers/s390/char/raw3270.h conflict!
88'3' 00-1F linux/suspend_ioctls.h conflict!
89 and kernel/power/user.c
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90'8' all SNP8023 advanced NIC card
91 <mailto:mcr@solidum.com>
cba3345c 92';' 64-7F linux/vfio.h
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93'@' 00-0F linux/radeonfb.h conflict!
94'@' 00-0F drivers/video/aty/aty128fb.c conflict!
95'A' 00-1F linux/apm_bios.h conflict!
96'A' 00-0F linux/agpgart.h conflict!
97 and drivers/char/agp/compat_ioctl.h
98'A' 00-7F sound/asound.h conflict!
99'B' 00-1F linux/cciss_ioctl.h conflict!
100'B' 00-0F include/linux/pmu.h conflict!
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101'B' C0-FF advanced bbus
102 <mailto:maassen@uni-freiburg.de>
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103'C' all linux/soundcard.h conflict!
104'C' 01-2F linux/capi.h conflict!
105'C' F0-FF drivers/net/wan/cosa.h conflict!
07983f0e 106'D' all arch/s390/include/asm/dasd.h
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107'D' 40-5F drivers/scsi/dpt/dtpi_ioctl.h
108'D' 05 drivers/scsi/pmcraid.h
109'E' all linux/input.h conflict!
110'E' 00-0F xen/evtchn.h conflict!
111'F' all linux/fb.h conflict!
112'F' 01-02 drivers/scsi/pmcraid.h conflict!
113'F' 20 drivers/video/fsl-diu-fb.h conflict!
114'F' 20 drivers/video/intelfb/intelfb.h conflict!
115'F' 20 linux/ivtvfb.h conflict!
116'F' 20 linux/matroxfb.h conflict!
117'F' 20 drivers/video/aty/atyfb_base.c conflict!
118'F' 00-0F video/da8xx-fb.h conflict!
119'F' 80-8F linux/arcfb.h conflict!
120'F' DD video/sstfb.h conflict!
121'G' 00-3F drivers/misc/sgi-gru/grulib.h conflict!
122'G' 00-0F linux/gigaset_dev.h conflict!
123'H' 00-7F linux/hiddev.h conflict!
124'H' 00-0F linux/hidraw.h conflict!
4cd7a7e7 125'H' 01 linux/mei.h conflict!
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126'H' 00-0F sound/asound.h conflict!
127'H' 20-40 sound/asound_fm.h conflict!
128'H' 80-8F sound/sfnt_info.h conflict!
129'H' 10-8F sound/emu10k1.h conflict!
130'H' 10-1F sound/sb16_csp.h conflict!
131'H' 10-1F sound/hda_hwdep.h conflict!
132'H' 40-4F sound/hdspm.h conflict!
133'H' 40-4F sound/hdsp.h conflict!
134'H' 90 sound/usb/usx2y/usb_stream.h
3edce1cf 135'H' A0 uapi/linux/usb/cdc-wdm.h
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136'H' C0-F0 net/bluetooth/hci.h conflict!
137'H' C0-DF net/bluetooth/hidp/hidp.h conflict!
138'H' C0-DF net/bluetooth/cmtp/cmtp.h conflict!
139'H' C0-DF net/bluetooth/bnep/bnep.h conflict!
5dc0c983 140'H' F1 linux/hid-roccat.h <mailto:erazor_de@users.sourceforge.net>
82fbb4f7 141'H' F8-FA sound/firewire.h
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142'I' all linux/isdn.h conflict!
143'I' 00-0F drivers/isdn/divert/isdn_divert.h conflict!
144'I' 40-4F linux/mISDNif.h conflict!
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145'J' 00-1F drivers/scsi/gdth_ioctl.h
146'K' all linux/kd.h
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147'L' 00-1F linux/loop.h conflict!
148'L' 10-1F drivers/scsi/mpt2sas/mpt2sas_ctl.h conflict!
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149'L' E0-FF linux/ppdd.h encrypted disk device driver
150 <http://linux01.gwdg.de/~alatham/ppdd.html>
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151'M' all linux/soundcard.h conflict!
152'M' 01-16 mtd/mtd-abi.h conflict!
153 and drivers/mtd/mtdchar.c
154'M' 01-03 drivers/scsi/megaraid/megaraid_sas.h
155'M' 00-0F drivers/video/fsl-diu-fb.h conflict!
1da177e4 156'N' 00-1F drivers/usb/scanner.h
b60503ba 157'N' 40-7F drivers/block/nvme.c
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158'O' 00-06 mtd/ubi-user.h UBI
159'P' all linux/soundcard.h conflict!
160'P' 60-6F sound/sscape_ioctl.h conflict!
161'P' 00-0F drivers/usb/class/usblp.c conflict!
1da177e4 162'Q' all linux/soundcard.h
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163'R' 00-1F linux/random.h conflict!
164'R' 01 linux/rfkill.h conflict!
cb5a8b2c 165'R' C0-DF net/bluetooth/rfcomm.h
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166'S' all linux/cdrom.h conflict!
167'S' 80-81 scsi/scsi_ioctl.h conflict!
168'S' 82-FF scsi/scsi.h conflict!
cb5a8b2c 169'S' 00-7F sound/asequencer.h conflict!
1da177e4 170'T' all linux/soundcard.h conflict!
cb5a8b2c 171'T' 00-AF sound/asound.h conflict!
07983f0e 172'T' all arch/x86/include/asm/ioctls.h conflict!
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173'T' C0-DF linux/if_tun.h conflict!
174'U' all sound/asound.h conflict!
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175'U' 00-CF linux/uinput.h conflict!
176'U' 00-EF linux/usbdevice_fs.h
177'U' C0-CF drivers/bluetooth/hci_uart.h
178'V' all linux/vt.h conflict!
179'V' all linux/videodev2.h conflict!
180'V' C0 linux/ivtvfb.h conflict!
181'V' C0 linux/ivtv.h conflict!
182'V' C0 media/davinci/vpfe_capture.h conflict!
183'V' C0 media/si4713.h conflict!
1da177e4 184'W' 00-1F linux/watchdog.h conflict!
a786a7c0 185'W' 00-1F linux/wanrouter.h conflict! (pre 3.9)
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186'W' 00-3F sound/asound.h conflict!
187'X' all fs/xfs/xfs_fs.h conflict!
188 and fs/xfs/linux-2.6/xfs_ioctl32.h
189 and include/linux/falloc.h
190 and linux/fs.h
191'X' all fs/ocfs2/ocfs_fs.h conflict!
192'X' 01 linux/pktcdvd.h conflict!
1da177e4 193'Y' all linux/cyclades.h
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194'Z' 14-15 drivers/message/fusion/mptctl.h
195'[' 00-07 linux/usb/tmc.h USB Test and Measurement Devices
bc5bca53 196 <mailto:gregkh@linuxfoundation.org>
cb5a8b2c 197'a' all linux/atm*.h, linux/sonet.h ATM on linux
0ea6e611 198 <http://lrcwww.epfl.ch/>
cb5a8b2c 199'b' 00-FF conflict! bit3 vme host bridge
1da177e4 200 <mailto:natalia@nikhefk.nikhef.nl>
cb5a8b2c 201'c' all linux/cm4000_cs.h conflict!
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202'c' 00-7F linux/comstats.h conflict!
203'c' 00-7F linux/coda.h conflict!
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204'c' 00-1F linux/chio.h conflict!
205'c' 80-9F arch/s390/include/asm/chsc.h conflict!
206'c' A0-AF arch/x86/include/asm/msr.h conflict!
1da177e4 207'd' 00-FF linux/char/drm/drm/h conflict!
cb5a8b2c 208'd' 02-40 pcmcia/ds.h conflict!
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209'd' F0-FF linux/digi1.h
210'e' all linux/digi1.h conflict!
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211'e' 00-1F drivers/net/irda/irtty-sir.h conflict!
212'f' 00-1F linux/ext2_fs.h conflict!
213'f' 00-1F linux/ext3_fs.h conflict!
214'f' 00-0F fs/jfs/jfs_dinode.h conflict!
215'f' 00-0F fs/ext4/ext4.h conflict!
216'f' 00-0F linux/fs.h conflict!
217'f' 00-0F fs/ocfs2/ocfs2_fs.h conflict!
218'g' 00-0F linux/usb/gadgetfs.h
219'g' 20-2F linux/usb/g_printer.h
220'h' 00-7F conflict! Charon filesystem
1da177e4 221 <mailto:zapman@interlan.net>
cb5a8b2c 222'h' 00-1F linux/hpet.h conflict!
a051f71c 223'h' 80-8F fs/hfsplus/ioctl.c
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224'i' 00-3F linux/i2o-dev.h conflict!
225'i' 0B-1F linux/ipmi.h conflict!
226'i' 80-8F linux/i8k.h
1da177e4 227'j' 00-3F linux/joystick.h
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228'k' 00-0F linux/spi/spidev.h conflict!
229'k' 00-05 video/kyro.h conflict!
43139a61 230'k' 10-17 linux/hsi/hsi_char.h HSI character device
1da177e4 231'l' 00-3F linux/tcfs_fs.h transparent cryptographic file system
0ea6e611 232 <http://web.archive.org/web/*/http://mikonos.dia.unisa.it/tcfs>
1da177e4 233'l' 40-7F linux/udf_fs_i.h in development:
98766fbe 234 <http://sourceforge.net/projects/linux-udf/>
cb5a8b2c 235'm' 00-09 linux/mmtimer.h conflict!
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236'm' all linux/mtio.h conflict!
237'm' all linux/soundcard.h conflict!
238'm' all linux/synclink.h conflict!
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239'm' 00-19 drivers/message/fusion/mptctl.h conflict!
240'm' 00 drivers/scsi/megaraid/megaraid_ioctl.h conflict!
1da177e4 241'm' 00-1F net/irda/irmod.h conflict!
cb5a8b2c 242'n' 00-7F linux/ncp_fs.h and fs/ncpfs/ioctl.c
1392e3b3 243'n' 80-8F linux/nilfs2_fs.h NILFS2
cb5a8b2c 244'n' E0-FF linux/matroxfb.h matroxfb
7f68fc28 245'o' 00-1F fs/ocfs2/ocfs2_fs.h OCFS2
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246'o' 00-03 mtd/ubi-user.h conflict! (OCFS2 and UBI overlaps)
247'o' 40-41 mtd/ubi-user.h UBI
248'o' 01-A1 linux/dvb/*.h DVB
cef2cf07 249'p' 00-0F linux/phantom.h conflict! (OpenHaptics needs this)
cb5a8b2c 250'p' 00-1F linux/rtc.h conflict!
cef2cf07 251'p' 00-3F linux/mc146818rtc.h conflict!
1da177e4 252'p' 40-7F linux/nvram.h
cb5a8b2c 253'p' 80-9F linux/ppdev.h user-space parport
1da177e4 254 <mailto:tim@cyberelk.net>
717c0336 255'p' A1-A5 linux/pps.h LinuxPPS
eae9d2ba 256 <mailto:giometti@linux.it>
1da177e4 257'q' 00-1F linux/serio.h
cb5a8b2c 258'q' 80-FF linux/telephony.h Internet PhoneJACK, Internet LineJACK
0ea6e611 259 linux/ixjuser.h <http://web.archive.org/web/*/http://www.quicknet.net>
cb5a8b2c 260'r' 00-1F linux/msdos_fs.h and fs/fat/dir.c
1da177e4 261's' all linux/cdk.h
bf7daebb 262't' 00-7F linux/ppp-ioctl.h
1da177e4 263't' 80-8F linux/isdn_ppp.h
cb5a8b2c 264't' 90 linux/toshiba.h
2116b7a4 265'u' 00-1F linux/smb_fs.h gone
5f708812 266'u' 20-3F linux/uvcvideo.h USB video class host driver
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267'v' 00-1F linux/ext2_fs.h conflict!
268'v' 00-1F linux/fs.h conflict!
269'v' 00-0F linux/sonypi.h conflict!
cb5a8b2c 270'v' C0-FF linux/meye.h conflict!
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271'w' all CERN SCI driver
272'y' 00-1F packet based user level communications
273 <mailto:zapman@interlan.net>
cb5a8b2c 274'z' 00-3F CAN bus card conflict!
1da177e4 275 <mailto:hdstich@connectu.ulm.circular.de>
cb5a8b2c 276'z' 40-7F CAN bus card conflict!
1da177e4 277 <mailto:oe@port.de>
cb5a8b2c 278'z' 10-4F drivers/s390/crypto/zcrypt_api.h conflict!
474966ee 279'|' 00-7F linux/media.h
1da177e4 2800x80 00-1F linux/fb.h
07983f0e 2810x89 00-06 arch/x86/include/asm/sockios.h
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2820x89 0B-DF linux/sockios.h
2830x89 E0-EF linux/sockios.h SIOCPROTOPRIVATE range
cb5a8b2c 2840x89 E0-EF linux/dn.h PROTOPRIVATE range
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2850x89 F0-FF linux/sockios.h SIOCDEVPRIVATE range
2860x8B all linux/wireless.h
2870x8C 00-3F WiNRADiO driver
0ea6e611 288 <http://www.winradio.com.au/>
1da177e4 2890x90 00 drivers/cdrom/sbpcd.h
cb5a8b2c 2900x92 00-0F drivers/usb/mon/mon_bin.c
1da177e4 2910x93 60-7F linux/auto_fs.h
cb5a8b2c 2920x94 all fs/btrfs/ioctl.h
fc7f99cf 2930x97 00-7F fs/ceph/ioctl.h Ceph file system
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2940x99 00-0F 537-Addinboard driver
295 <mailto:buk@buks.ipn.de>
2960xA0 all linux/sdp/sdp.h Industrial Device Project
297 <mailto:kenji@bitgate.com>
ea41b1e5 2980xA2 00-0F arch/tile/include/asm/hardwall.h
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2990xA3 80-8F Port ACL in development:
300 <mailto:tlewis@mindspring.com>
3010xA3 90-9F linux/dtlk.h
3020xAB 00-1F linux/nbd.h
3030xAC 00-1F linux/raw.h
3040xAD 00 Netfilter device in development:
cb5a8b2c 305 <mailto:rusty@rustcorp.com.au>
258ac8e0 3060xAE all linux/kvm.h Kernel-based Virtual Machine
0aaeb3b1 307 <mailto:kvm@vger.kernel.org>
6db71994 3080xAF 00-1F linux/fsl_hypervisor.h Freescale hypervisor
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3090xB0 all RATIO devices in development:
310 <mailto:vgo@ratio.de>
3110xB1 00-1F PPPoX <mailto:mostrows@styx.uwaterloo.ca>
cb87ea28 3120xB3 00 linux/mmc/ioctl.h
cb5a8b2c 3130xC0 00-0F linux/usb/iowarrior.h
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3140xCB 00-1F CBM serial IEC bus in development:
315 <mailto:michael.klein@puffin.lb.shuttle.de>
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3160xCD 01 linux/reiserfs_fs.h
3170xCF 02 fs/cifs/ioctl.c
3180xDB 00-0F drivers/char/mwave/mwavepub.h
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3190xDD 00-3F ZFCP device driver see drivers/s390/scsi/
320 <mailto:aherrman@de.ibm.com>
cb5a8b2c 3210xF3 00-3F drivers/usb/misc/sisusbvga/sisusb.h sisfb (in development)
1da177e4 322 <mailto:thomas@winischhofer.net>
1ce4d390
RA
3230xF4 00-1F video/mbxfb.h mbxfb
324 <mailto:raph@8d.com>
14d01ff5
MD
3250xF6 all LTTng Linux Trace Toolkit Next Generation
326 <mailto:mathieu.desnoyers@efficios.com>
cb5a8b2c 3270xFD all linux/dm-ioctl.h
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