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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 | Ioctl Numbers 19 October 1999 Michael Elizabeth Chastain <mec@shout.net> If you are adding new ioctl's to the kernel, you should use the _IO macros defined in <linux/ioctl.h>: _IO an ioctl with no parameters _IOW an ioctl with write parameters (copy_from_user) _IOR an ioctl with read parameters (copy_to_user) _IOWR an ioctl with both write and read parameters. 'Write' and 'read' are from the user's point of view, just like the system calls 'write' and 'read'. For example, a SET_FOO ioctl would be _IOW, although the kernel would actually read data from user space; a GET_FOO ioctl would be _IOR, although the kernel would actually write data to user space. The first argument to _IO, _IOW, _IOR, or _IOWR is an identifying letter or number from the table below. Because of the large number of drivers, many drivers share a partial letter with other drivers. If you are writing a driver for a new device and need a letter, pick an unused block with enough room for expansion: 32 to 256 ioctl commands. You can register the block by patching this file and submitting the patch to Linus Torvalds. Or you can e-mail me at <mec@shout.net> and I'll register one for you. The second argument to _IO, _IOW, _IOR, or _IOWR is a sequence number to distinguish ioctls from each other. The third argument to _IOW, _IOR, or _IOWR is the type of the data going into the kernel or coming out of the kernel (e.g. 'int' or 'struct foo'). NOTE! Do NOT use sizeof(arg) as the third argument as this results in your ioctl thinking it passes an argument of type size_t. Some devices use their major number as the identifier; this is OK, as long as it is unique. Some devices are irregular and don't follow any convention at all. Following this convention is good because: (1) Keeping the ioctl's globally unique helps error checking: if a program calls an ioctl on the wrong device, it will get an error rather than some unexpected behaviour. (2) The 'strace' build procedure automatically finds ioctl numbers defined with _IO, _IOW, _IOR, or _IOWR. (3) 'strace' can decode numbers back into useful names when the numbers are unique. (4) People looking for ioctls can grep for them more easily when this convention is used to define the ioctl numbers. (5) When following the convention, the driver code can use generic code to copy the parameters between user and kernel space. This table lists ioctls visible from user land for Linux/x86. It contains most drivers up to 2.6.31, but I know I am missing some. There has been no attempt to list non-X86 architectures or ioctls from drivers/staging/. Code Seq#(hex) Include File Comments ======================================================== 0x00 00-1F linux/fs.h conflict! 0x00 00-1F scsi/scsi_ioctl.h conflict! 0x00 00-1F linux/fb.h conflict! 0x00 00-1F linux/wavefront.h conflict! 0x02 all linux/fd.h 0x03 all linux/hdreg.h 0x04 D2-DC linux/umsdos_fs.h Dead since 2.6.11, but don't reuse these. 0x06 all linux/lp.h 0x09 all linux/raid/md_u.h 0x10 00-0F drivers/char/s390/vmcp.h 0x10 10-1F arch/s390/include/uapi/sclp_ctl.h 0x10 20-2F arch/s390/include/uapi/asm/hypfs.h 0x12 all linux/fs.h linux/blkpg.h 0x1b all InfiniBand Subsystem <http://infiniband.sourceforge.net/> 0x20 all drivers/cdrom/cm206.h 0x22 all scsi/sg.h '#' 00-3F IEEE 1394 Subsystem Block for the entire subsystem '$' 00-0F linux/perf_counter.h, linux/perf_event.h '%' 00-0F include/uapi/linux/stm.h System Trace Module subsystem <mailto:alexander.shishkin@linux.intel.com> '&' 00-07 drivers/firewire/nosy-user.h '1' 00-1F <linux/timepps.h> PPS kit from Ulrich Windl <ftp://ftp.de.kernel.org/pub/linux/daemons/ntp/PPS/> '2' 01-04 linux/i2o.h '3' 00-0F drivers/s390/char/raw3270.h conflict! '3' 00-1F linux/suspend_ioctls.h conflict! and kernel/power/user.c '8' all SNP8023 advanced NIC card <mailto:mcr@solidum.com> ';' 64-7F linux/vfio.h '@' 00-0F linux/radeonfb.h conflict! '@' 00-0F drivers/video/aty/aty128fb.c conflict! 'A' 00-1F linux/apm_bios.h conflict! 'A' 00-0F linux/agpgart.h conflict! and drivers/char/agp/compat_ioctl.h 'A' 00-7F sound/asound.h conflict! 'B' 00-1F linux/cciss_ioctl.h conflict! 'B' 00-0F include/linux/pmu.h conflict! 'B' C0-FF advanced bbus <mailto:maassen@uni-freiburg.de> 'C' all linux/soundcard.h conflict! 'C' 01-2F linux/capi.h conflict! 'C' F0-FF drivers/net/wan/cosa.h conflict! 'D' all arch/s390/include/asm/dasd.h 'D' 40-5F drivers/scsi/dpt/dtpi_ioctl.h 'D' 05 drivers/scsi/pmcraid.h 'E' all linux/input.h conflict! 'E' 00-0F xen/evtchn.h conflict! 'F' all linux/fb.h conflict! 'F' 01-02 drivers/scsi/pmcraid.h conflict! 'F' 20 drivers/video/fsl-diu-fb.h conflict! 'F' 20 drivers/video/intelfb/intelfb.h conflict! 'F' 20 linux/ivtvfb.h conflict! 'F' 20 linux/matroxfb.h conflict! 'F' 20 drivers/video/aty/atyfb_base.c conflict! 'F' 00-0F video/da8xx-fb.h conflict! 'F' 80-8F linux/arcfb.h conflict! 'F' DD video/sstfb.h conflict! 'G' 00-3F drivers/misc/sgi-gru/grulib.h conflict! 'G' 00-0F linux/gigaset_dev.h conflict! 'H' 00-7F linux/hiddev.h conflict! 'H' 00-0F linux/hidraw.h conflict! 'H' 01 linux/mei.h conflict! 'H' 02 linux/mei.h conflict! 'H' 03 linux/mei.h conflict! 'H' 00-0F sound/asound.h conflict! 'H' 20-40 sound/asound_fm.h conflict! 'H' 80-8F sound/sfnt_info.h conflict! 'H' 10-8F sound/emu10k1.h conflict! 'H' 10-1F sound/sb16_csp.h conflict! 'H' 10-1F sound/hda_hwdep.h conflict! 'H' 40-4F sound/hdspm.h conflict! 'H' 40-4F sound/hdsp.h conflict! 'H' 90 sound/usb/usx2y/usb_stream.h 'H' A0 uapi/linux/usb/cdc-wdm.h 'H' C0-F0 net/bluetooth/hci.h conflict! 'H' C0-DF net/bluetooth/hidp/hidp.h conflict! 'H' C0-DF net/bluetooth/cmtp/cmtp.h conflict! 'H' C0-DF net/bluetooth/bnep/bnep.h conflict! 'H' F1 linux/hid-roccat.h <mailto:erazor_de@users.sourceforge.net> 'H' F8-FA sound/firewire.h 'I' all linux/isdn.h conflict! 'I' 00-0F drivers/isdn/divert/isdn_divert.h conflict! 'I' 40-4F linux/mISDNif.h conflict! 'J' 00-1F drivers/scsi/gdth_ioctl.h 'K' all linux/kd.h 'L' 00-1F linux/loop.h conflict! 'L' 10-1F drivers/scsi/mpt3sas/mpt3sas_ctl.h conflict! 'L' 20-2F linux/lightnvm.h 'L' E0-FF linux/ppdd.h encrypted disk device driver <http://linux01.gwdg.de/~alatham/ppdd.html> 'M' all linux/soundcard.h conflict! 'M' 01-16 mtd/mtd-abi.h conflict! and drivers/mtd/mtdchar.c 'M' 01-03 drivers/scsi/megaraid/megaraid_sas.h 'M' 00-0F drivers/video/fsl-diu-fb.h conflict! 'N' 00-1F drivers/usb/scanner.h 'N' 40-7F drivers/block/nvme.c 'O' 00-06 mtd/ubi-user.h UBI 'P' all linux/soundcard.h conflict! 'P' 60-6F sound/sscape_ioctl.h conflict! 'P' 00-0F drivers/usb/class/usblp.c conflict! 'P' 01-09 drivers/misc/pci_endpoint_test.c conflict! 'Q' all linux/soundcard.h 'R' 00-1F linux/random.h conflict! 'R' 01 linux/rfkill.h conflict! 'R' C0-DF net/bluetooth/rfcomm.h 'S' all linux/cdrom.h conflict! 'S' 80-81 scsi/scsi_ioctl.h conflict! 'S' 82-FF scsi/scsi.h conflict! 'S' 00-7F sound/asequencer.h conflict! 'T' all linux/soundcard.h conflict! 'T' 00-AF sound/asound.h conflict! 'T' all arch/x86/include/asm/ioctls.h conflict! 'T' C0-DF linux/if_tun.h conflict! 'U' all sound/asound.h conflict! 'U' 00-CF linux/uinput.h conflict! 'U' 00-EF linux/usbdevice_fs.h 'U' C0-CF drivers/bluetooth/hci_uart.h 'V' all linux/vt.h conflict! 'V' all linux/videodev2.h conflict! 'V' C0 linux/ivtvfb.h conflict! 'V' C0 linux/ivtv.h conflict! 'V' C0 media/davinci/vpfe_capture.h conflict! 'V' C0 media/si4713.h conflict! 'W' 00-1F linux/watchdog.h conflict! 'W' 00-1F linux/wanrouter.h conflict! (pre 3.9) 'W' 00-3F sound/asound.h conflict! 'W' 40-5F drivers/pci/switch/switchtec.c 'X' all fs/xfs/xfs_fs.h conflict! and fs/xfs/linux-2.6/xfs_ioctl32.h and include/linux/falloc.h and linux/fs.h 'X' all fs/ocfs2/ocfs_fs.h conflict! 'X' 01 linux/pktcdvd.h conflict! 'Y' all linux/cyclades.h 'Z' 14-15 drivers/message/fusion/mptctl.h '[' 00-07 linux/usb/tmc.h USB Test and Measurement Devices <mailto:gregkh@linuxfoundation.org> 'a' all linux/atm*.h, linux/sonet.h ATM on linux <http://lrcwww.epfl.ch/> 'a' 00-0F drivers/crypto/qat/qat_common/adf_cfg_common.h conflict! qat driver 'b' 00-FF conflict! bit3 vme host bridge <mailto:natalia@nikhefk.nikhef.nl> 'c' all linux/cm4000_cs.h conflict! 'c' 00-7F linux/comstats.h conflict! 'c' 00-7F linux/coda.h conflict! 'c' 00-1F linux/chio.h conflict! 'c' 80-9F arch/s390/include/asm/chsc.h conflict! 'c' A0-AF arch/x86/include/asm/msr.h conflict! 'd' 00-FF linux/char/drm/drm.h conflict! 'd' 02-40 pcmcia/ds.h conflict! 'd' F0-FF linux/digi1.h 'e' all linux/digi1.h conflict! 'f' 00-1F linux/ext2_fs.h conflict! 'f' 00-1F linux/ext3_fs.h conflict! 'f' 00-0F fs/jfs/jfs_dinode.h conflict! 'f' 00-0F fs/ext4/ext4.h conflict! 'f' 00-0F linux/fs.h conflict! 'f' 00-0F fs/ocfs2/ocfs2_fs.h conflict! 'g' 00-0F linux/usb/gadgetfs.h 'g' 20-2F linux/usb/g_printer.h 'h' 00-7F conflict! Charon filesystem <mailto:zapman@interlan.net> 'h' 00-1F linux/hpet.h conflict! 'h' 80-8F fs/hfsplus/ioctl.c 'i' 00-3F linux/i2o-dev.h conflict! 'i' 0B-1F linux/ipmi.h conflict! 'i' 80-8F linux/i8k.h 'j' 00-3F linux/joystick.h 'k' 00-0F linux/spi/spidev.h conflict! 'k' 00-05 video/kyro.h conflict! 'k' 10-17 linux/hsi/hsi_char.h HSI character device 'l' 00-3F linux/tcfs_fs.h transparent cryptographic file system <http://web.archive.org/web/*/http://mikonos.dia.unisa.it/tcfs> 'l' 40-7F linux/udf_fs_i.h in development: <http://sourceforge.net/projects/linux-udf/> 'm' 00-09 linux/mmtimer.h conflict! 'm' all linux/mtio.h conflict! 'm' all linux/soundcard.h conflict! 'm' all linux/synclink.h conflict! 'm' 00-19 drivers/message/fusion/mptctl.h conflict! 'm' 00 drivers/scsi/megaraid/megaraid_ioctl.h conflict! 'n' 00-7F linux/ncp_fs.h and fs/ncpfs/ioctl.c 'n' 80-8F uapi/linux/nilfs2_api.h NILFS2 'n' E0-FF linux/matroxfb.h matroxfb 'o' 00-1F fs/ocfs2/ocfs2_fs.h OCFS2 'o' 00-03 mtd/ubi-user.h conflict! (OCFS2 and UBI overlaps) 'o' 40-41 mtd/ubi-user.h UBI 'o' 01-A1 linux/dvb/*.h DVB 'p' 00-0F linux/phantom.h conflict! (OpenHaptics needs this) 'p' 00-1F linux/rtc.h conflict! 'p' 00-3F linux/mc146818rtc.h conflict! 'p' 40-7F linux/nvram.h 'p' 80-9F linux/ppdev.h user-space parport <mailto:tim@cyberelk.net> 'p' A1-A5 linux/pps.h LinuxPPS <mailto:giometti@linux.it> 'q' 00-1F linux/serio.h 'q' 80-FF linux/telephony.h Internet PhoneJACK, Internet LineJACK linux/ixjuser.h <http://web.archive.org/web/*/http://www.quicknet.net> 'r' 00-1F linux/msdos_fs.h and fs/fat/dir.c 's' all linux/cdk.h 't' 00-7F linux/ppp-ioctl.h 't' 80-8F linux/isdn_ppp.h 't' 90-91 linux/toshiba.h toshiba and toshiba_acpi SMM 'u' 00-1F linux/smb_fs.h gone 'u' 20-3F linux/uvcvideo.h USB video class host driver 'v' 00-1F linux/ext2_fs.h conflict! 'v' 00-1F linux/fs.h conflict! 'v' 00-0F linux/sonypi.h conflict! 'v' 00-0F media/v4l2-subdev.h conflict! 'v' C0-FF linux/meye.h conflict! 'w' all CERN SCI driver 'y' 00-1F packet based user level communications <mailto:zapman@interlan.net> 'z' 00-3F CAN bus card conflict! <mailto:hdstich@connectu.ulm.circular.de> 'z' 40-7F CAN bus card conflict! <mailto:oe@port.de> 'z' 10-4F drivers/s390/crypto/zcrypt_api.h conflict! '|' 00-7F linux/media.h 0x80 00-1F linux/fb.h 0x89 00-06 arch/x86/include/asm/sockios.h 0x89 0B-DF linux/sockios.h 0x89 E0-EF linux/sockios.h SIOCPROTOPRIVATE range 0x89 E0-EF linux/dn.h PROTOPRIVATE range 0x89 F0-FF linux/sockios.h SIOCDEVPRIVATE range 0x8B all linux/wireless.h 0x8C 00-3F WiNRADiO driver <http://www.winradio.com.au/> 0x90 00 drivers/cdrom/sbpcd.h 0x92 00-0F drivers/usb/mon/mon_bin.c 0x93 60-7F linux/auto_fs.h 0x94 all fs/btrfs/ioctl.h Btrfs filesystem and linux/fs.h some lifted to vfs/generic 0x97 00-7F fs/ceph/ioctl.h Ceph file system 0x99 00-0F 537-Addinboard driver <mailto:buk@buks.ipn.de> 0xA0 all linux/sdp/sdp.h Industrial Device Project <mailto:kenji@bitgate.com> 0xA1 0 linux/vtpm_proxy.h TPM Emulator Proxy Driver 0xA3 80-8F Port ACL in development: <mailto:tlewis@mindspring.com> 0xA3 90-9F linux/dtlk.h 0xA4 00-1F uapi/linux/tee.h Generic TEE subsystem 0xAA 00-3F linux/uapi/linux/userfaultfd.h 0xAB 00-1F linux/nbd.h 0xAC 00-1F linux/raw.h 0xAD 00 Netfilter device in development: <mailto:rusty@rustcorp.com.au> 0xAE all linux/kvm.h Kernel-based Virtual Machine <mailto:kvm@vger.kernel.org> 0xAF 00-1F linux/fsl_hypervisor.h Freescale hypervisor 0xB0 all RATIO devices in development: <mailto:vgo@ratio.de> 0xB1 00-1F PPPoX <mailto:mostrows@styx.uwaterloo.ca> 0xB3 00 linux/mmc/ioctl.h 0xB4 00-0F linux/gpio.h <mailto:linux-gpio@vger.kernel.org> 0xB5 00-0F uapi/linux/rpmsg.h <mailto:linux-remoteproc@vger.kernel.org> 0xB6 all linux/fpga-dfl.h 0xC0 00-0F linux/usb/iowarrior.h 0xCA 00-0F uapi/misc/cxl.h 0xCA 10-2F uapi/misc/ocxl.h 0xCA 80-BF uapi/scsi/cxlflash_ioctl.h 0xCB 00-1F CBM serial IEC bus in development: <mailto:michael.klein@puffin.lb.shuttle.de> 0xCC 00-0F drivers/misc/ibmvmc.h pseries VMC driver 0xCD 01 linux/reiserfs_fs.h 0xCF 02 fs/cifs/ioctl.c 0xDB 00-0F drivers/char/mwave/mwavepub.h 0xDD 00-3F ZFCP device driver see drivers/s390/scsi/ <mailto:aherrman@de.ibm.com> 0xE5 00-3F linux/fuse.h 0xEC 00-01 drivers/platform/chrome/cros_ec_dev.h ChromeOS EC driver 0xF3 00-3F drivers/usb/misc/sisusbvga/sisusb.h sisfb (in development) <mailto:thomas@winischhofer.net> 0xF4 00-1F video/mbxfb.h mbxfb <mailto:raph@8d.com> 0xF6 all LTTng Linux Trace Toolkit Next Generation <mailto:mathieu.desnoyers@efficios.com> 0xFD all linux/dm-ioctl.h |