| Mauro Carvalho Chehab | 0853610 | 2019-04-18 11:21:26 -0300 | [diff] [blame] | 1 | ============= |
| 2 | Ioctl Numbers |
| 3 | ============= |
| 4 | |
| 5 | 19 October 1999 |
| 6 | |
| 7 | Michael Elizabeth Chastain |
| 8 | <mec@shout.net> |
| 9 | |
| 10 | If you are adding new ioctl's to the kernel, you should use the _IO |
| 11 | macros defined in <linux/ioctl.h>: |
| 12 | |
| 13 | ====== == ============================================ |
| 14 | _IO an ioctl with no parameters |
| 15 | _IOW an ioctl with write parameters (copy_from_user) |
| 16 | _IOR an ioctl with read parameters (copy_to_user) |
| 17 | _IOWR an ioctl with both write and read parameters. |
| 18 | ====== == ============================================ |
| 19 | |
| 20 | 'Write' and 'read' are from the user's point of view, just like the |
| 21 | system calls 'write' and 'read'. For example, a SET_FOO ioctl would |
| 22 | be _IOW, although the kernel would actually read data from user space; |
| 23 | a GET_FOO ioctl would be _IOR, although the kernel would actually write |
| 24 | data to user space. |
| 25 | |
| 26 | The first argument to _IO, _IOW, _IOR, or _IOWR is an identifying letter |
| 27 | or number from the table below. Because of the large number of drivers, |
| 28 | many drivers share a partial letter with other drivers. |
| 29 | |
| 30 | If you are writing a driver for a new device and need a letter, pick an |
| 31 | unused block with enough room for expansion: 32 to 256 ioctl commands. |
| 32 | You can register the block by patching this file and submitting the |
| 33 | patch to Linus Torvalds. Or you can e-mail me at <mec@shout.net> and |
| 34 | I'll register one for you. |
| 35 | |
| 36 | The second argument to _IO, _IOW, _IOR, or _IOWR is a sequence number |
| 37 | to distinguish ioctls from each other. The third argument to _IOW, |
| 38 | _IOR, or _IOWR is the type of the data going into the kernel or coming |
| 39 | out of the kernel (e.g. 'int' or 'struct foo'). NOTE! Do NOT use |
| 40 | sizeof(arg) as the third argument as this results in your ioctl thinking |
| 41 | it passes an argument of type size_t. |
| 42 | |
| 43 | Some devices use their major number as the identifier; this is OK, as |
| 44 | long as it is unique. Some devices are irregular and don't follow any |
| 45 | convention at all. |
| 46 | |
| 47 | Following this convention is good because: |
| 48 | |
| 49 | (1) Keeping the ioctl's globally unique helps error checking: |
| 50 | if a program calls an ioctl on the wrong device, it will get an |
| 51 | error rather than some unexpected behaviour. |
| 52 | |
| 53 | (2) The 'strace' build procedure automatically finds ioctl numbers |
| 54 | defined with _IO, _IOW, _IOR, or _IOWR. |
| 55 | |
| 56 | (3) 'strace' can decode numbers back into useful names when the |
| 57 | numbers are unique. |
| 58 | |
| 59 | (4) People looking for ioctls can grep for them more easily when |
| 60 | this convention is used to define the ioctl numbers. |
| 61 | |
| 62 | (5) When following the convention, the driver code can use generic |
| 63 | code to copy the parameters between user and kernel space. |
| 64 | |
| 65 | This table lists ioctls visible from user land for Linux/x86. It contains |
| 66 | most drivers up to 2.6.31, but I know I am missing some. There has been |
| 67 | no attempt to list non-X86 architectures or ioctls from drivers/staging/. |
| 68 | |
| 69 | ==== ===== ======================================================= ================================================================ |
| 70 | Code Seq# Include File Comments |
| 71 | (hex) |
| 72 | ==== ===== ======================================================= ================================================================ |
| 73 | 0x00 00-1F linux/fs.h conflict! |
| 74 | 0x00 00-1F scsi/scsi_ioctl.h conflict! |
| 75 | 0x00 00-1F linux/fb.h conflict! |
| 76 | 0x00 00-1F linux/wavefront.h conflict! |
| 77 | 0x02 all linux/fd.h |
| 78 | 0x03 all linux/hdreg.h |
| 79 | 0x04 D2-DC linux/umsdos_fs.h Dead since 2.6.11, but don't reuse these. |
| 80 | 0x06 all linux/lp.h |
| 81 | 0x09 all linux/raid/md_u.h |
| 82 | 0x10 00-0F drivers/char/s390/vmcp.h |
| 83 | 0x10 10-1F arch/s390/include/uapi/sclp_ctl.h |
| 84 | 0x10 20-2F arch/s390/include/uapi/asm/hypfs.h |
| 85 | 0x12 all linux/fs.h |
| 86 | linux/blkpg.h |
| 87 | 0x1b all InfiniBand Subsystem |
| 88 | <http://infiniband.sourceforge.net/> |
| 89 | 0x20 all drivers/cdrom/cm206.h |
| 90 | 0x22 all scsi/sg.h |
| 91 | '!' 00-1F uapi/linux/seccomp.h |
| 92 | '#' 00-3F IEEE 1394 Subsystem |
| 93 | Block for the entire subsystem |
| 94 | '$' 00-0F linux/perf_counter.h, linux/perf_event.h |
| 95 | '%' 00-0F include/uapi/linux/stm.h System Trace Module subsystem |
| 96 | <mailto:alexander.shishkin@linux.intel.com> |
| 97 | '&' 00-07 drivers/firewire/nosy-user.h |
| 98 | '1' 00-1F linux/timepps.h PPS kit from Ulrich Windl |
| 99 | <ftp://ftp.de.kernel.org/pub/linux/daemons/ntp/PPS/> |
| 100 | '2' 01-04 linux/i2o.h |
| 101 | '3' 00-0F drivers/s390/char/raw3270.h conflict! |
| 102 | '3' 00-1F linux/suspend_ioctls.h, conflict! |
| 103 | kernel/power/user.c |
| 104 | '8' all SNP8023 advanced NIC card |
| 105 | <mailto:mcr@solidum.com> |
| 106 | ';' 64-7F linux/vfio.h |
| 107 | '@' 00-0F linux/radeonfb.h conflict! |
| 108 | '@' 00-0F drivers/video/aty/aty128fb.c conflict! |
| 109 | 'A' 00-1F linux/apm_bios.h conflict! |
| 110 | 'A' 00-0F linux/agpgart.h, conflict! |
| 111 | drivers/char/agp/compat_ioctl.h |
| 112 | 'A' 00-7F sound/asound.h conflict! |
| 113 | 'B' 00-1F linux/cciss_ioctl.h conflict! |
| 114 | 'B' 00-0F include/linux/pmu.h conflict! |
| 115 | 'B' C0-FF advanced bbus <mailto:maassen@uni-freiburg.de> |
| 116 | 'C' all linux/soundcard.h conflict! |
| 117 | 'C' 01-2F linux/capi.h conflict! |
| 118 | 'C' F0-FF drivers/net/wan/cosa.h conflict! |
| 119 | 'D' all arch/s390/include/asm/dasd.h |
| 120 | 'D' 40-5F drivers/scsi/dpt/dtpi_ioctl.h |
| 121 | 'D' 05 drivers/scsi/pmcraid.h |
| 122 | 'E' all linux/input.h conflict! |
| 123 | 'E' 00-0F xen/evtchn.h conflict! |
| 124 | 'F' all linux/fb.h conflict! |
| 125 | 'F' 01-02 drivers/scsi/pmcraid.h conflict! |
| 126 | 'F' 20 drivers/video/fsl-diu-fb.h conflict! |
| 127 | 'F' 20 drivers/video/intelfb/intelfb.h conflict! |
| 128 | 'F' 20 linux/ivtvfb.h conflict! |
| 129 | 'F' 20 linux/matroxfb.h conflict! |
| 130 | 'F' 20 drivers/video/aty/atyfb_base.c conflict! |
| 131 | 'F' 00-0F video/da8xx-fb.h conflict! |
| 132 | 'F' 80-8F linux/arcfb.h conflict! |
| 133 | 'F' DD video/sstfb.h conflict! |
| 134 | 'G' 00-3F drivers/misc/sgi-gru/grulib.h conflict! |
| 135 | 'G' 00-0F linux/gigaset_dev.h conflict! |
| 136 | 'H' 00-7F linux/hiddev.h conflict! |
| 137 | 'H' 00-0F linux/hidraw.h conflict! |
| 138 | 'H' 01 linux/mei.h conflict! |
| 139 | 'H' 02 linux/mei.h conflict! |
| 140 | 'H' 03 linux/mei.h conflict! |
| 141 | 'H' 00-0F sound/asound.h conflict! |
| 142 | 'H' 20-40 sound/asound_fm.h conflict! |
| 143 | 'H' 80-8F sound/sfnt_info.h conflict! |
| 144 | 'H' 10-8F sound/emu10k1.h conflict! |
| 145 | 'H' 10-1F sound/sb16_csp.h conflict! |
| 146 | 'H' 10-1F sound/hda_hwdep.h conflict! |
| 147 | 'H' 40-4F sound/hdspm.h conflict! |
| 148 | 'H' 40-4F sound/hdsp.h conflict! |
| 149 | 'H' 90 sound/usb/usx2y/usb_stream.h |
| 150 | 'H' A0 uapi/linux/usb/cdc-wdm.h |
| 151 | 'H' C0-F0 net/bluetooth/hci.h conflict! |
| 152 | 'H' C0-DF net/bluetooth/hidp/hidp.h conflict! |
| 153 | 'H' C0-DF net/bluetooth/cmtp/cmtp.h conflict! |
| 154 | 'H' C0-DF net/bluetooth/bnep/bnep.h conflict! |
| 155 | 'H' F1 linux/hid-roccat.h <mailto:erazor_de@users.sourceforge.net> |
| 156 | 'H' F8-FA sound/firewire.h |
| 157 | 'I' all linux/isdn.h conflict! |
| 158 | 'I' 00-0F drivers/isdn/divert/isdn_divert.h conflict! |
| 159 | 'I' 40-4F linux/mISDNif.h conflict! |
| 160 | 'J' 00-1F drivers/scsi/gdth_ioctl.h |
| 161 | 'K' all linux/kd.h |
| 162 | 'L' 00-1F linux/loop.h conflict! |
| 163 | 'L' 10-1F drivers/scsi/mpt3sas/mpt3sas_ctl.h conflict! |
| 164 | 'L' 20-2F linux/lightnvm.h |
| 165 | 'L' E0-FF linux/ppdd.h encrypted disk device driver |
| 166 | <http://linux01.gwdg.de/~alatham/ppdd.html> |
| 167 | 'M' all linux/soundcard.h conflict! |
| 168 | 'M' 01-16 mtd/mtd-abi.h conflict! |
| 169 | and drivers/mtd/mtdchar.c |
| 170 | 'M' 01-03 drivers/scsi/megaraid/megaraid_sas.h |
| 171 | 'M' 00-0F drivers/video/fsl-diu-fb.h conflict! |
| 172 | 'N' 00-1F drivers/usb/scanner.h |
| 173 | 'N' 40-7F drivers/block/nvme.c |
| 174 | 'O' 00-06 mtd/ubi-user.h UBI |
| 175 | 'P' all linux/soundcard.h conflict! |
| 176 | 'P' 60-6F sound/sscape_ioctl.h conflict! |
| 177 | 'P' 00-0F drivers/usb/class/usblp.c conflict! |
| 178 | 'P' 01-09 drivers/misc/pci_endpoint_test.c conflict! |
| 179 | 'Q' all linux/soundcard.h |
| 180 | 'R' 00-1F linux/random.h conflict! |
| 181 | 'R' 01 linux/rfkill.h conflict! |
| 182 | 'R' C0-DF net/bluetooth/rfcomm.h |
| 183 | 'S' all linux/cdrom.h conflict! |
| 184 | 'S' 80-81 scsi/scsi_ioctl.h conflict! |
| 185 | 'S' 82-FF scsi/scsi.h conflict! |
| 186 | 'S' 00-7F sound/asequencer.h conflict! |
| 187 | 'T' all linux/soundcard.h conflict! |
| 188 | 'T' 00-AF sound/asound.h conflict! |
| 189 | 'T' all arch/x86/include/asm/ioctls.h conflict! |
| 190 | 'T' C0-DF linux/if_tun.h conflict! |
| 191 | 'U' all sound/asound.h conflict! |
| 192 | 'U' 00-CF linux/uinput.h conflict! |
| 193 | 'U' 00-EF linux/usbdevice_fs.h |
| 194 | 'U' C0-CF drivers/bluetooth/hci_uart.h |
| 195 | 'V' all linux/vt.h conflict! |
| 196 | 'V' all linux/videodev2.h conflict! |
| 197 | 'V' C0 linux/ivtvfb.h conflict! |
| 198 | 'V' C0 linux/ivtv.h conflict! |
| 199 | 'V' C0 media/davinci/vpfe_capture.h conflict! |
| 200 | 'V' C0 media/si4713.h conflict! |
| 201 | 'W' 00-1F linux/watchdog.h conflict! |
| 202 | 'W' 00-1F linux/wanrouter.h conflict! (pre 3.9) |
| 203 | 'W' 00-3F sound/asound.h conflict! |
| 204 | 'W' 40-5F drivers/pci/switch/switchtec.c |
| 205 | 'X' all fs/xfs/xfs_fs.h, conflict! |
| 206 | fs/xfs/linux-2.6/xfs_ioctl32.h, |
| 207 | include/linux/falloc.h, |
| 208 | linux/fs.h, |
| 209 | 'X' all fs/ocfs2/ocfs_fs.h conflict! |
| 210 | 'X' 01 linux/pktcdvd.h conflict! |
| 211 | 'Y' all linux/cyclades.h |
| 212 | 'Z' 14-15 drivers/message/fusion/mptctl.h |
| 213 | '[' 00-3F linux/usb/tmc.h USB Test and Measurement Devices |
| 214 | <mailto:gregkh@linuxfoundation.org> |
| 215 | 'a' all linux/atm*.h, linux/sonet.h ATM on linux |
| 216 | <http://lrcwww.epfl.ch/> |
| 217 | 'a' 00-0F drivers/crypto/qat/qat_common/adf_cfg_common.h conflict! qat driver |
| 218 | 'b' 00-FF conflict! bit3 vme host bridge |
| 219 | <mailto:natalia@nikhefk.nikhef.nl> |
| 220 | 'c' all linux/cm4000_cs.h conflict! |
| 221 | 'c' 00-7F linux/comstats.h conflict! |
| 222 | 'c' 00-7F linux/coda.h conflict! |
| 223 | 'c' 00-1F linux/chio.h conflict! |
| 224 | 'c' 80-9F arch/s390/include/asm/chsc.h conflict! |
| 225 | 'c' A0-AF arch/x86/include/asm/msr.h conflict! |
| 226 | 'd' 00-FF linux/char/drm/drm.h conflict! |
| 227 | 'd' 02-40 pcmcia/ds.h conflict! |
| 228 | 'd' F0-FF linux/digi1.h |
| 229 | 'e' all linux/digi1.h conflict! |
| 230 | 'f' 00-1F linux/ext2_fs.h conflict! |
| 231 | 'f' 00-1F linux/ext3_fs.h conflict! |
| 232 | 'f' 00-0F fs/jfs/jfs_dinode.h conflict! |
| 233 | 'f' 00-0F fs/ext4/ext4.h conflict! |
| 234 | 'f' 00-0F linux/fs.h conflict! |
| 235 | 'f' 00-0F fs/ocfs2/ocfs2_fs.h conflict! |
| 236 | 'g' 00-0F linux/usb/gadgetfs.h |
| 237 | 'g' 20-2F linux/usb/g_printer.h |
| 238 | 'h' 00-7F conflict! Charon filesystem |
| 239 | <mailto:zapman@interlan.net> |
| 240 | 'h' 00-1F linux/hpet.h conflict! |
| 241 | 'h' 80-8F fs/hfsplus/ioctl.c |
| 242 | 'i' 00-3F linux/i2o-dev.h conflict! |
| 243 | 'i' 0B-1F linux/ipmi.h conflict! |
| 244 | 'i' 80-8F linux/i8k.h |
| 245 | 'j' 00-3F linux/joystick.h |
| 246 | 'k' 00-0F linux/spi/spidev.h conflict! |
| 247 | 'k' 00-05 video/kyro.h conflict! |
| 248 | 'k' 10-17 linux/hsi/hsi_char.h HSI character device |
| 249 | 'l' 00-3F linux/tcfs_fs.h transparent cryptographic file system |
| 250 | <http://web.archive.org/web/%2A/http://mikonos.dia.unisa.it/tcfs> |
| 251 | 'l' 40-7F linux/udf_fs_i.h in development: |
| 252 | <http://sourceforge.net/projects/linux-udf/> |
| 253 | 'm' 00-09 linux/mmtimer.h conflict! |
| 254 | 'm' all linux/mtio.h conflict! |
| 255 | 'm' all linux/soundcard.h conflict! |
| 256 | 'm' all linux/synclink.h conflict! |
| 257 | 'm' 00-19 drivers/message/fusion/mptctl.h conflict! |
| 258 | 'm' 00 drivers/scsi/megaraid/megaraid_ioctl.h conflict! |
| 259 | 'n' 00-7F linux/ncp_fs.h and fs/ncpfs/ioctl.c |
| 260 | 'n' 80-8F uapi/linux/nilfs2_api.h NILFS2 |
| 261 | 'n' E0-FF linux/matroxfb.h matroxfb |
| 262 | 'o' 00-1F fs/ocfs2/ocfs2_fs.h OCFS2 |
| 263 | 'o' 00-03 mtd/ubi-user.h conflict! (OCFS2 and UBI overlaps) |
| 264 | 'o' 40-41 mtd/ubi-user.h UBI |
| 265 | 'o' 01-A1 `linux/dvb/*.h` DVB |
| 266 | 'p' 00-0F linux/phantom.h conflict! (OpenHaptics needs this) |
| 267 | 'p' 00-1F linux/rtc.h conflict! |
| 268 | 'p' 00-3F linux/mc146818rtc.h conflict! |
| 269 | 'p' 40-7F linux/nvram.h |
| 270 | 'p' 80-9F linux/ppdev.h user-space parport |
| 271 | <mailto:tim@cyberelk.net> |
| 272 | 'p' A1-A5 linux/pps.h LinuxPPS |
| 273 | <mailto:giometti@linux.it> |
| 274 | 'q' 00-1F linux/serio.h |
| 275 | 'q' 80-FF linux/telephony.h Internet PhoneJACK, Internet LineJACK |
| 276 | linux/ixjuser.h <http://web.archive.org/web/%2A/http://www.quicknet.net> |
| 277 | 'r' 00-1F linux/msdos_fs.h and fs/fat/dir.c |
| 278 | 's' all linux/cdk.h |
| 279 | 't' 00-7F linux/ppp-ioctl.h |
| 280 | 't' 80-8F linux/isdn_ppp.h |
| 281 | 't' 90-91 linux/toshiba.h toshiba and toshiba_acpi SMM |
| 282 | 'u' 00-1F linux/smb_fs.h gone |
| 283 | 'u' 20-3F linux/uvcvideo.h USB video class host driver |
| 284 | 'u' 40-4f linux/udmabuf.h userspace dma-buf misc device |
| 285 | 'v' 00-1F linux/ext2_fs.h conflict! |
| 286 | 'v' 00-1F linux/fs.h conflict! |
| 287 | 'v' 00-0F linux/sonypi.h conflict! |
| 288 | 'v' 00-0F media/v4l2-subdev.h conflict! |
| 289 | 'v' C0-FF linux/meye.h conflict! |
| 290 | 'w' all CERN SCI driver |
| 291 | 'y' 00-1F packet based user level communications |
| 292 | <mailto:zapman@interlan.net> |
| 293 | 'z' 00-3F CAN bus card conflict! |
| 294 | <mailto:hdstich@connectu.ulm.circular.de> |
| 295 | 'z' 40-7F CAN bus card conflict! |
| 296 | <mailto:oe@port.de> |
| 297 | 'z' 10-4F drivers/s390/crypto/zcrypt_api.h conflict! |
| 298 | '|' 00-7F linux/media.h |
| 299 | 0x80 00-1F linux/fb.h |
| 300 | 0x89 00-06 arch/x86/include/asm/sockios.h |
| 301 | 0x89 0B-DF linux/sockios.h |
| 302 | 0x89 E0-EF linux/sockios.h SIOCPROTOPRIVATE range |
| 303 | 0x89 E0-EF linux/dn.h PROTOPRIVATE range |
| 304 | 0x89 F0-FF linux/sockios.h SIOCDEVPRIVATE range |
| 305 | 0x8B all linux/wireless.h |
| 306 | 0x8C 00-3F WiNRADiO driver |
| 307 | <http://www.winradio.com.au/> |
| 308 | 0x90 00 drivers/cdrom/sbpcd.h |
| 309 | 0x92 00-0F drivers/usb/mon/mon_bin.c |
| 310 | 0x93 60-7F linux/auto_fs.h |
| 311 | 0x94 all fs/btrfs/ioctl.h Btrfs filesystem |
| 312 | and linux/fs.h some lifted to vfs/generic |
| 313 | 0x97 00-7F fs/ceph/ioctl.h Ceph file system |
| 314 | 0x99 00-0F 537-Addinboard driver |
| 315 | <mailto:buk@buks.ipn.de> |
| 316 | 0xA0 all linux/sdp/sdp.h Industrial Device Project |
| 317 | <mailto:kenji@bitgate.com> |
| 318 | 0xA1 0 linux/vtpm_proxy.h TPM Emulator Proxy Driver |
| 319 | 0xA3 80-8F Port ACL in development: |
| 320 | <mailto:tlewis@mindspring.com> |
| 321 | 0xA3 90-9F linux/dtlk.h |
| 322 | 0xA4 00-1F uapi/linux/tee.h Generic TEE subsystem |
| 323 | 0xAA 00-3F linux/uapi/linux/userfaultfd.h |
| 324 | 0xAB 00-1F linux/nbd.h |
| 325 | 0xAC 00-1F linux/raw.h |
| 326 | 0xAD 00 Netfilter device in development: |
| 327 | <mailto:rusty@rustcorp.com.au> |
| 328 | 0xAE all linux/kvm.h Kernel-based Virtual Machine |
| 329 | <mailto:kvm@vger.kernel.org> |
| 330 | 0xAF 00-1F linux/fsl_hypervisor.h Freescale hypervisor |
| 331 | 0xB0 all RATIO devices in development: |
| 332 | <mailto:vgo@ratio.de> |
| 333 | 0xB1 00-1F PPPoX |
| 334 | <mailto:mostrows@styx.uwaterloo.ca> |
| 335 | 0xB3 00 linux/mmc/ioctl.h |
| 336 | 0xB4 00-0F linux/gpio.h <mailto:linux-gpio@vger.kernel.org> |
| 337 | 0xB5 00-0F uapi/linux/rpmsg.h <mailto:linux-remoteproc@vger.kernel.org> |
| 338 | 0xB6 all linux/fpga-dfl.h |
| 339 | 0xC0 00-0F linux/usb/iowarrior.h |
| 340 | 0xCA 00-0F uapi/misc/cxl.h |
| 341 | 0xCA 10-2F uapi/misc/ocxl.h |
| 342 | 0xCA 80-BF uapi/scsi/cxlflash_ioctl.h |
| 343 | 0xCB 00-1F CBM serial IEC bus in development: |
| 344 | <mailto:michael.klein@puffin.lb.shuttle.de> |
| 345 | 0xCC 00-0F drivers/misc/ibmvmc.h pseries VMC driver |
| 346 | 0xCD 01 linux/reiserfs_fs.h |
| 347 | 0xCF 02 fs/cifs/ioctl.c |
| 348 | 0xDB 00-0F drivers/char/mwave/mwavepub.h |
| 349 | 0xDD 00-3F ZFCP device driver see drivers/s390/scsi/ |
| 350 | <mailto:aherrman@de.ibm.com> |
| 351 | 0xE5 00-3F linux/fuse.h |
| 352 | 0xEC 00-01 drivers/platform/chrome/cros_ec_dev.h ChromeOS EC driver |
| 353 | 0xF3 00-3F drivers/usb/misc/sisusbvga/sisusb.h sisfb (in development) |
| 354 | <mailto:thomas@winischhofer.net> |
| 355 | 0xF4 00-1F video/mbxfb.h mbxfb |
| 356 | <mailto:raph@8d.com> |
| 357 | 0xF6 all LTTng Linux Trace Toolkit Next Generation |
| 358 | <mailto:mathieu.desnoyers@efficios.com> |
| 359 | 0xFD all linux/dm-ioctl.h |
| 360 | 0xFE all linux/isst_if.h |
| 361 | ==== ===== ======================================================= ================================================================ |