Documentation / ioctl / ioctl-number.txt
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Based on kernel version 2.6.35.4. Page generated on 2010-09-02 21:39 EST.
1 Ioctl Numbers 2 19 October 1999 3 Michael Elizabeth Chastain 4 <mec[AT]shout[DOT]net> 5 6 If you are adding new ioctl's to the kernel, you should use the _IO 7 macros 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 15 system calls 'write' and 'read'. For example, a SET_FOO ioctl would 16 be _IOW, although the kernel would actually read data from user space; 17 a GET_FOO ioctl would be _IOR, although the kernel would actually write 18 data to user space. 19 20 The first argument to _IO, _IOW, _IOR, or _IOWR is an identifying letter 21 or number from the table below. Because of the large number of drivers, 22 many drivers share a partial letter with other drivers. 23 24 If you are writing a driver for a new device and need a letter, pick an 25 unused block with enough room for expansion: 32 to 256 ioctl commands. 26 You can register the block by patching this file and submitting the 27 patch to Linus Torvalds. Or you can e-mail me at <mec[AT]shout[DOT]net> and 28 I'll register one for you. 29 30 The second argument to _IO, _IOW, _IOR, or _IOWR is a sequence number 31 to 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 33 out of the kernel (e.g. 'int' or 'struct foo'). NOTE! Do NOT use 34 sizeof(arg) as the third argument as this results in your ioctl thinking 35 it passes an argument of type size_t. 36 37 Some devices use their major number as the identifier; this is OK, as 38 long as it is unique. Some devices are irregular and don't follow any 39 convention at all. 40 41 Following 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 59 This table lists ioctls visible from user land for Linux/x86. It contains 60 most drivers up to 2.6.31, but I know I am missing some. There has been 61 no attempt to list non-X86 architectures or ioctls from drivers/staging/. 62 63 Code Seq#(hex) Include File Comments 64 ======================================================== 65 0x00 00-1F linux/fs.h conflict! 66 0x00 00-1F scsi/scsi_ioctl.h conflict! 67 0x00 00-1F linux/fb.h conflict! 68 0x00 00-1F linux/wavefront.h conflict! 69 0x02 all linux/fd.h 70 0x03 all linux/hdreg.h 71 0x04 D2-DC linux/umsdos_fs.h Dead since 2.6.11, but don't reuse these. 72 0x06 all linux/lp.h 73 0x09 all linux/raid/md_u.h 74 0x10 00-0F drivers/char/s390/vmcp.h 75 0x12 all linux/fs.h 76 linux/blkpg.h 77 0x1b all InfiniBand Subsystem <http://www.openib.org/> 78 0x20 all drivers/cdrom/cm206.h 79 0x22 all scsi/sg.h 80 '#' 00-3F IEEE 1394 Subsystem Block for the entire subsystem 81 '$' 00-0F linux/perf_counter.h, linux/perf_event.h 82 '1' 00-1F <linux/timepps.h> PPS kit from Ulrich Windl 83 <ftp://ftp.de.kernel.org/pub/linux/daemons/ntp/PPS/> 84 '2' 01-04 linux/i2o.h 85 '3' 00-0F drivers/s390/char/raw3270.h conflict! 86 '3' 00-1F linux/suspend_ioctls.h conflict! 87 and kernel/power/user.c 88 '8' all SNP8023 advanced NIC card 89 <mailto:mcr[AT]solidum[DOT]com> 90 '[AT]' 00-0F linux/radeonfb[DOT]h conflict! 91 '[AT]' 00-0F drivers/video/aty/aty128fb[DOT]c conflict! 92 'A' 00-1F linux/apm_bios.h conflict! 93 'A' 00-0F linux/agpgart.h conflict! 94 and drivers/char/agp/compat_ioctl.h 95 'A' 00-7F sound/asound.h conflict! 96 'B' 00-1F linux/cciss_ioctl.h conflict! 97 'B' 00-0F include/linux/pmu.h conflict! 98 'B' C0-FF advanced bbus 99 <mailto:maassen[AT]uni-freiburg[DOT]de> 100 'C' all linux/soundcard.h conflict! 101 'C' 01-2F linux/capi.h conflict! 102 'C' F0-FF drivers/net/wan/cosa.h conflict! 103 'D' all arch/s390/include/asm/dasd.h 104 'D' 40-5F drivers/scsi/dpt/dtpi_ioctl.h 105 'D' 05 drivers/scsi/pmcraid.h 106 'E' all linux/input.h conflict! 107 'E' 00-0F xen/evtchn.h conflict! 108 'F' all linux/fb.h conflict! 109 'F' 01-02 drivers/scsi/pmcraid.h conflict! 110 'F' 20 drivers/video/fsl-diu-fb.h conflict! 111 'F' 20 drivers/video/intelfb/intelfb.h conflict! 112 'F' 20 linux/ivtvfb.h conflict! 113 'F' 20 linux/matroxfb.h conflict! 114 'F' 20 drivers/video/aty/atyfb_base.c conflict! 115 'F' 00-0F video/da8xx-fb.h conflict! 116 'F' 80-8F linux/arcfb.h conflict! 117 'F' DD video/sstfb.h conflict! 118 'G' 00-3F drivers/misc/sgi-gru/grulib.h conflict! 119 'G' 00-0F linux/gigaset_dev.h conflict! 120 'H' 00-7F linux/hiddev.h conflict! 121 'H' 00-0F linux/hidraw.h conflict! 122 'H' 00-0F sound/asound.h conflict! 123 'H' 20-40 sound/asound_fm.h conflict! 124 'H' 80-8F sound/sfnt_info.h conflict! 125 'H' 10-8F sound/emu10k1.h conflict! 126 'H' 10-1F sound/sb16_csp.h conflict! 127 'H' 10-1F sound/hda_hwdep.h conflict! 128 'H' 40-4F sound/hdspm.h conflict! 129 'H' 40-4F sound/hdsp.h conflict! 130 'H' 90 sound/usb/usx2y/usb_stream.h 131 'H' C0-F0 net/bluetooth/hci.h conflict! 132 'H' C0-DF net/bluetooth/hidp/hidp.h conflict! 133 'H' C0-DF net/bluetooth/cmtp/cmtp.h conflict! 134 'H' C0-DF net/bluetooth/bnep/bnep.h conflict! 135 'I' all linux/isdn.h conflict! 136 'I' 00-0F drivers/isdn/divert/isdn_divert.h conflict! 137 'I' 40-4F linux/mISDNif.h conflict! 138 'J' 00-1F drivers/scsi/gdth_ioctl.h 139 'K' all linux/kd.h 140 'L' 00-1F linux/loop.h conflict! 141 'L' 10-1F drivers/scsi/mpt2sas/mpt2sas_ctl.h conflict! 142 'L' E0-FF linux/ppdd.h encrypted disk device driver 143 <http://linux01.gwdg.de/~alatham/ppdd.html> 144 'M' all linux/soundcard.h conflict! 145 'M' 01-16 mtd/mtd-abi.h conflict! 146 and drivers/mtd/mtdchar.c 147 'M' 01-03 drivers/scsi/megaraid/megaraid_sas.h 148 'M' 00-0F drivers/video/fsl-diu-fb.h conflict! 149 'N' 00-1F drivers/usb/scanner.h 150 'O' 00-06 mtd/ubi-user.h UBI 151 'P' all linux/soundcard.h conflict! 152 'P' 60-6F sound/sscape_ioctl.h conflict! 153 'P' 00-0F drivers/usb/class/usblp.c conflict! 154 'Q' all linux/soundcard.h 155 'R' 00-1F linux/random.h conflict! 156 'R' 01 linux/rfkill.h conflict! 157 'R' 01-0F media/rds.h conflict! 158 'R' C0-DF net/bluetooth/rfcomm.h 159 'S' all linux/cdrom.h conflict! 160 'S' 80-81 scsi/scsi_ioctl.h conflict! 161 'S' 82-FF scsi/scsi.h conflict! 162 'S' 00-7F sound/asequencer.h conflict! 163 'T' all linux/soundcard.h conflict! 164 'T' 00-AF sound/asound.h conflict! 165 'T' all arch/x86/include/asm/ioctls.h conflict! 166 'T' C0-DF linux/if_tun.h conflict! 167 'U' all sound/asound.h conflict! 168 'U' 00-0F drivers/media/video/uvc/uvcvideo.h conflict! 169 'U' 00-CF linux/uinput.h conflict! 170 'U' 00-EF linux/usbdevice_fs.h 171 'U' C0-CF drivers/bluetooth/hci_uart.h 172 'V' all linux/vt.h conflict! 173 'V' all linux/videodev2.h conflict! 174 'V' C0 linux/ivtvfb.h conflict! 175 'V' C0 linux/ivtv.h conflict! 176 'V' C0 media/davinci/vpfe_capture.h conflict! 177 'V' C0 media/si4713.h conflict! 178 'V' C0-CF drivers/media/video/mxb.h conflict! 179 'W' 00-1F linux/watchdog.h conflict! 180 'W' 00-1F linux/wanrouter.h conflict! 181 'W' 00-3F sound/asound.h conflict! 182 'X' all fs/xfs/xfs_fs.h conflict! 183 and fs/xfs/linux-2.6/xfs_ioctl32.h 184 and include/linux/falloc.h 185 and linux/fs.h 186 'X' all fs/ocfs2/ocfs_fs.h conflict! 187 'X' 01 linux/pktcdvd.h conflict! 188 'Y' all linux/cyclades.h 189 'Z' 14-15 drivers/message/fusion/mptctl.h 190 '[' 00-07 linux/usb/tmc.h USB Test and Measurement Devices 191 <mailto:gregkh[AT]suse[DOT]de> 192 'a' all linux/atm*.h, linux/sonet.h ATM on linux 193 <http://lrcwww.epfl.ch/linux-atm/magic.html> 194 'b' 00-FF conflict! bit3 vme host bridge 195 <mailto:natalia[AT]nikhefk.nikhef[DOT]nl> 196 'b' 00-0F media/bt819.h conflict! 197 'c' all linux/cm4000_cs.h conflict! 198 'c' 00-7F linux/comstats.h conflict! 199 'c' 00-7F linux/coda.h conflict! 200 'c' 00-1F linux/chio.h conflict! 201 'c' 80-9F arch/s390/include/asm/chsc.h conflict! 202 'c' A0-AF arch/x86/include/asm/msr.h conflict! 203 'd' 00-FF linux/char/drm/drm/h conflict! 204 'd' 02-40 pcmcia/ds.h conflict! 205 'd' 10-3F drivers/media/video/dabusb.h conflict! 206 'd' C0-CF drivers/media/video/saa7191.h conflict! 207 'd' F0-FF linux/digi1.h 208 'e' all linux/digi1.h conflict! 209 'e' 00-1F drivers/net/irda/irtty-sir.h conflict! 210 'f' 00-1F linux/ext2_fs.h conflict! 211 'f' 00-1F linux/ext3_fs.h conflict! 212 'f' 00-0F fs/jfs/jfs_dinode.h conflict! 213 'f' 00-0F fs/ext4/ext4.h conflict! 214 'f' 00-0F linux/fs.h conflict! 215 'f' 00-0F fs/ocfs2/ocfs2_fs.h conflict! 216 'g' 00-0F linux/usb/gadgetfs.h 217 'g' 20-2F linux/usb/g_printer.h 218 'h' 00-7F conflict! Charon filesystem 219 <mailto:zapman[AT]interlan[DOT]net> 220 'h' 00-1F linux/hpet.h conflict! 221 'i' 00-3F linux/i2o-dev.h conflict! 222 'i' 0B-1F linux/ipmi.h conflict! 223 'i' 80-8F linux/i8k.h 224 'j' 00-3F linux/joystick.h 225 'k' 00-0F linux/spi/spidev.h conflict! 226 'k' 00-05 video/kyro.h conflict! 227 'l' 00-3F linux/tcfs_fs.h transparent cryptographic file system 228 <http://mikonos.dia.unisa.it/tcfs> 229 'l' 40-7F linux/udf_fs_i.h in development: 230 <http://sourceforge.net/projects/linux-udf/> 231 'm' 00-09 linux/mmtimer.h conflict! 232 'm' all linux/mtio.h conflict! 233 'm' all linux/soundcard.h conflict! 234 'm' all linux/synclink.h conflict! 235 'm' 00-19 drivers/message/fusion/mptctl.h conflict! 236 'm' 00 drivers/scsi/megaraid/megaraid_ioctl.h conflict! 237 'm' 00-1F net/irda/irmod.h conflict! 238 'n' 00-7F linux/ncp_fs.h and fs/ncpfs/ioctl.c 239 'n' 80-8F linux/nilfs2_fs.h NILFS2 240 'n' E0-FF linux/matroxfb.h matroxfb 241 'o' 00-1F fs/ocfs2/ocfs2_fs.h OCFS2 242 'o' 00-03 mtd/ubi-user.h conflict! (OCFS2 and UBI overlaps) 243 'o' 40-41 mtd/ubi-user.h UBI 244 'o' 01-A1 linux/dvb/*.h DVB 245 'p' 00-0F linux/phantom.h conflict! (OpenHaptics needs this) 246 'p' 00-1F linux/rtc.h conflict! 247 'p' 00-3F linux/mc146818rtc.h conflict! 248 'p' 40-7F linux/nvram.h 249 'p' 80-9F linux/ppdev.h user-space parport 250 <mailto:tim[AT]cyberelk[DOT]net> 251 'p' A1-A4 linux/pps.h LinuxPPS 252 <mailto:giometti[AT]linux[DOT]it> 253 'q' 00-1F linux/serio.h 254 'q' 80-FF linux/telephony.h Internet PhoneJACK, Internet LineJACK 255 linux/ixjuser.h <http://www.quicknet.net> 256 'r' 00-1F linux/msdos_fs.h and fs/fat/dir.c 257 's' all linux/cdk.h 258 't' 00-7F linux/if_ppp.h 259 't' 80-8F linux/isdn_ppp.h 260 't' 90 linux/toshiba.h 261 'u' 00-1F linux/smb_fs.h 262 'v' all linux/videodev.h conflict! 263 'v' 00-1F linux/ext2_fs.h conflict! 264 'v' 00-1F linux/fs.h conflict! 265 'v' 00-0F linux/sonypi.h conflict! 266 'v' C0-CF drivers/media/video/ov511.h conflict! 267 'v' C0-DF media/pwc-ioctl.h conflict! 268 'v' C0-FF linux/meye.h conflict! 269 'v' C0-CF drivers/media/video/zoran/zoran.h conflict! 270 'v' D0-DF drivers/media/video/cpia2/cpia2dev.h conflict! 271 'w' all CERN SCI driver 272 'y' 00-1F packet based user level communications 273 <mailto:zapman[AT]interlan[DOT]net> 274 'z' 00-3F CAN bus card conflict! 275 <mailto:hdstich[AT]connectu.ulm.circular[DOT]de> 276 'z' 40-7F CAN bus card conflict! 277 <mailto:oe[AT]port[DOT]de> 278 'z' 10-4F drivers/s390/crypto/zcrypt_api.h conflict! 279 0x80 00-1F linux/fb.h 280 0x81 00-1F linux/videotext.h 281 0x88 00-3F media/ovcamchip.h 282 0x89 00-06 arch/x86/include/asm/sockios.h 283 0x89 0B-DF linux/sockios.h 284 0x89 E0-EF linux/sockios.h SIOCPROTOPRIVATE range 285 0x89 E0-EF linux/dn.h PROTOPRIVATE range 286 0x89 F0-FF linux/sockios.h SIOCDEVPRIVATE range 287 0x8B all linux/wireless.h 288 0x8C 00-3F WiNRADiO driver 289 <http://www.proximity.com.au/~brian/winradio/> 290 0x90 00 drivers/cdrom/sbpcd.h 291 0x92 00-0F drivers/usb/mon/mon_bin.c 292 0x93 60-7F linux/auto_fs.h 293 0x94 all fs/btrfs/ioctl.h 294 0x97 00-7F fs/ceph/ioctl.h Ceph file system 295 0x99 00-0F 537-Addinboard driver 296 <mailto:buk[AT]buks.ipn[DOT]de> 297 0xA0 all linux/sdp/sdp.h Industrial Device Project 298 <mailto:kenji[AT]bitgate[DOT]com> 299 0xA3 80-8F Port ACL in development: 300 <mailto:tlewis[AT]mindspring[DOT]com> 301 0xA3 90-9F linux/dtlk.h 302 0xAB 00-1F linux/nbd.h 303 0xAC 00-1F linux/raw.h 304 0xAD 00 Netfilter device in development: 305 <mailto:rusty[AT]rustcorp.com[DOT]au> 306 0xAE all linux/kvm.h Kernel-based Virtual Machine 307 <mailto:kvm[AT]vger.kernel[DOT]org> 308 0xB0 all RATIO devices in development: 309 <mailto:vgo[AT]ratio[DOT]de> 310 0xB1 00-1F PPPoX <mailto:mostrows[AT]styx.uwaterloo[DOT]ca> 311 0xC0 00-0F linux/usb/iowarrior.h 312 0xCB 00-1F CBM serial IEC bus in development: 313 <mailto:michael.klein[AT]puffin.lb.shuttle[DOT]de> 314 0xCD 01 linux/reiserfs_fs.h 315 0xCF 02 fs/cifs/ioctl.c 316 0xDB 00-0F drivers/char/mwave/mwavepub.h 317 0xDD 00-3F ZFCP device driver see drivers/s390/scsi/ 318 <mailto:aherrman[AT]de.ibm[DOT]com> 319 0xF3 00-3F drivers/usb/misc/sisusbvga/sisusb.h sisfb (in development) 320 <mailto:thomas[AT]winischhofer[DOT]net> 321 0xF4 00-1F video/mbxfb.h mbxfb 322 <mailto:raph[AT]8d[DOT]com> 323 0xFD all linux/dm-ioctl.h
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