1 ============= 1 =============
2 Ioctl Numbers 2 Ioctl Numbers
3 ============= 3 =============
4 4
5 19 October 1999 5 19 October 1999
6 6
7 Michael Elizabeth Chastain 7 Michael Elizabeth Chastain
8 <mec@shout.net> 8 <mec@shout.net>
9 9
10 If you are adding new ioctl's to the kernel, y 10 If you are adding new ioctl's to the kernel, you should use the _IO
11 macros defined in <linux/ioctl.h>: 11 macros defined in <linux/ioctl.h>:
12 12
13 ====== == ================================ 13 ====== == ============================================
14 _IO an ioctl with no parameters 14 _IO an ioctl with no parameters
15 _IOW an ioctl with write parameters (cop 15 _IOW an ioctl with write parameters (copy_from_user)
16 _IOR an ioctl with read parameters (cop 16 _IOR an ioctl with read parameters (copy_to_user)
17 _IOWR an ioctl with both write and read p 17 _IOWR an ioctl with both write and read parameters.
18 ====== == ================================ 18 ====== == ============================================
19 19
20 'Write' and 'read' are from the user's point o 20 'Write' and 'read' are from the user's point of view, just like the
21 system calls 'write' and 'read'. For example, 21 system calls 'write' and 'read'. For example, a SET_FOO ioctl would
22 be _IOW, although the kernel would actually re 22 be _IOW, although the kernel would actually read data from user space;
23 a GET_FOO ioctl would be _IOR, although the ke 23 a GET_FOO ioctl would be _IOR, although the kernel would actually write
24 data to user space. 24 data to user space.
25 25
26 The first argument to _IO, _IOW, _IOR, or _IOW 26 The first argument to _IO, _IOW, _IOR, or _IOWR is an identifying letter
27 or number from the table below. Because of th 27 or number from the table below. Because of the large number of drivers,
28 many drivers share a partial letter with other 28 many drivers share a partial letter with other drivers.
29 29
30 If you are writing a driver for a new device a 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: 3 31 unused block with enough room for expansion: 32 to 256 ioctl commands.
32 You can register the block by patching this fi 32 You can register the block by patching this file and submitting the
33 patch to Linus Torvalds. Or you can e-mail me< 33 patch to Linus Torvalds. Or you can e-mail me at <mec@shout.net> and
34 I'll register one for you. 34 I'll register one for you.
35 35
36 The second argument to _IO, _IOW, _IOR, or _IO 36 The second argument to _IO, _IOW, _IOR, or _IOWR is a sequence number
37 to distinguish ioctls from each other. The th 37 to distinguish ioctls from each other. The third argument to _IOW,
38 _IOR, or _IOWR is the type of the data going i 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' 39 out of the kernel (e.g. 'int' or 'struct foo'). NOTE! Do NOT use
40 sizeof(arg) as the third argument as this resu 40 sizeof(arg) as the third argument as this results in your ioctl thinking
41 it passes an argument of type size_t. 41 it passes an argument of type size_t.
42 42
43 Some devices use their major number as the ide 43 Some devices use their major number as the identifier; this is OK, as
44 long as it is unique. Some devices are irregu 44 long as it is unique. Some devices are irregular and don't follow any
45 convention at all. 45 convention at all.
46 46
47 Following this convention is good because: 47 Following this convention is good because:
48 48
49 (1) Keeping the ioctl's globally unique helps 49 (1) Keeping the ioctl's globally unique helps error checking:
50 if a program calls an ioctl on the wrong d 50 if a program calls an ioctl on the wrong device, it will get an
51 error rather than some unexpected behaviou 51 error rather than some unexpected behaviour.
52 52
53 (2) The 'strace' build procedure automatically 53 (2) The 'strace' build procedure automatically finds ioctl numbers
54 defined with _IO, _IOW, _IOR, or _IOWR. 54 defined with _IO, _IOW, _IOR, or _IOWR.
55 55
56 (3) 'strace' can decode numbers back into usef 56 (3) 'strace' can decode numbers back into useful names when the
57 numbers are unique. 57 numbers are unique.
58 58
59 (4) People looking for ioctls can grep for the 59 (4) People looking for ioctls can grep for them more easily when
60 this convention is used to define the ioct 60 this convention is used to define the ioctl numbers.
61 61
62 (5) When following the convention, the driver 62 (5) When following the convention, the driver code can use generic
63 code to copy the parameters between user a 63 code to copy the parameters between user and kernel space.
64 64
65 This table lists ioctls visible from user land 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 mis 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 io 67 no attempt to list non-X86 architectures or ioctls from drivers/staging/.
68 68
69 ==== ===== ================================= 69 ==== ===== ======================================================= ================================================================
70 Code Seq# Include File 70 Code Seq# Include File Comments
71 (hex) 71 (hex)
72 ==== ===== ================================= 72 ==== ===== ======================================================= ================================================================
73 0x00 00-1F linux/fs.h 73 0x00 00-1F linux/fs.h conflict!
74 0x00 00-1F scsi/scsi_ioctl.h 74 0x00 00-1F scsi/scsi_ioctl.h conflict!
75 0x00 00-1F linux/fb.h 75 0x00 00-1F linux/fb.h conflict!
76 0x00 00-1F linux/wavefront.h 76 0x00 00-1F linux/wavefront.h conflict!
77 0x02 all linux/fd.h 77 0x02 all linux/fd.h
78 0x03 all linux/hdreg.h 78 0x03 all linux/hdreg.h
79 0x04 D2-DC linux/umsdos_fs.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 80 0x06 all linux/lp.h
81 0x07 9F-D0 linux/vmw_vmci_defs.h, uapi/linux 81 0x07 9F-D0 linux/vmw_vmci_defs.h, uapi/linux/vm_sockets.h
82 0x09 all linux/raid/md_u.h 82 0x09 all linux/raid/md_u.h
83 0x10 00-0F drivers/char/s390/vmcp.h 83 0x10 00-0F drivers/char/s390/vmcp.h
84 0x10 10-1F arch/s390/include/uapi/sclp_ctl.h 84 0x10 10-1F arch/s390/include/uapi/sclp_ctl.h
85 0x10 20-2F arch/s390/include/uapi/asm/hypfs. 85 0x10 20-2F arch/s390/include/uapi/asm/hypfs.h
86 0x12 all linux/fs.h 86 0x12 all linux/fs.h BLK* ioctls
87 linux/blkpg.h 87 linux/blkpg.h
88 0x15 all linux/fs.h 88 0x15 all linux/fs.h FS_IOC_* ioctls
89 0x1b all 89 0x1b all InfiniBand Subsystem
90 90 <http://infiniband.sourceforge.net/>
91 0x20 all drivers/cdrom/cm206.h 91 0x20 all drivers/cdrom/cm206.h
92 0x22 all scsi/sg.h 92 0x22 all scsi/sg.h
93 0x3E 00-0F linux/counter.h < 93 0x3E 00-0F linux/counter.h <mailto:linux-iio@vger.kernel.org>
94 '!' 00-1F uapi/linux/seccomp.h 94 '!' 00-1F uapi/linux/seccomp.h
95 '#' 00-3F 95 '#' 00-3F IEEE 1394 Subsystem
96 96 Block for the entire subsystem
97 '$' 00-0F linux/perf_counter.h, linux/perf_ 97 '$' 00-0F linux/perf_counter.h, linux/perf_event.h
98 '%' 00-0F include/uapi/linux/stm.h 98 '%' 00-0F include/uapi/linux/stm.h System Trace Module subsystem
99 < 99 <mailto:alexander.shishkin@linux.intel.com>
100 '&' 00-07 drivers/firewire/nosy-user.h 100 '&' 00-07 drivers/firewire/nosy-user.h
101 '*' 00-1F uapi/linux/user_events.h 101 '*' 00-1F uapi/linux/user_events.h User Events Subsystem
102 < 102 <mailto:linux-trace-kernel@vger.kernel.org>
103 '1' 00-1F linux/timepps.h 103 '1' 00-1F linux/timepps.h PPS kit from Ulrich Windl
104 104 <ftp://ftp.de.kernel.org/pub/linux/daemons/ntp/PPS/>
105 '2' 01-04 linux/i2o.h 105 '2' 01-04 linux/i2o.h
106 '3' 00-0F drivers/s390/char/raw3270.h 106 '3' 00-0F drivers/s390/char/raw3270.h conflict!
107 '3' 00-1F linux/suspend_ioctls.h, 107 '3' 00-1F linux/suspend_ioctls.h, conflict!
108 kernel/power/user.c 108 kernel/power/user.c
109 '8' all 109 '8' all SNP8023 advanced NIC card
110 < 110 <mailto:mcr@solidum.com>
111 ';' 64-7F linux/vfio.h 111 ';' 64-7F linux/vfio.h
112 ';' 80-FF linux/iommufd.h 112 ';' 80-FF linux/iommufd.h
113 '=' 00-3f uapi/linux/ptp_clock.h < 113 '=' 00-3f uapi/linux/ptp_clock.h <mailto:richardcochran@gmail.com>
114 '@' 00-0F linux/radeonfb.h 114 '@' 00-0F linux/radeonfb.h conflict!
115 '@' 00-0F drivers/video/aty/aty128fb.c 115 '@' 00-0F drivers/video/aty/aty128fb.c conflict!
116 'A' 00-1F linux/apm_bios.h 116 'A' 00-1F linux/apm_bios.h conflict!
117 'A' 00-0F linux/agpgart.h, 117 'A' 00-0F linux/agpgart.h, conflict!
118 drivers/char/agp/compat_ioctl.h 118 drivers/char/agp/compat_ioctl.h
119 'A' 00-7F sound/asound.h 119 'A' 00-7F sound/asound.h conflict!
120 'B' 00-1F linux/cciss_ioctl.h 120 'B' 00-1F linux/cciss_ioctl.h conflict!
121 'B' 00-0F include/linux/pmu.h 121 'B' 00-0F include/linux/pmu.h conflict!
122 'B' C0-FF advanced bbus < 122 'B' C0-FF advanced bbus <mailto:maassen@uni-freiburg.de>
123 'B' 00-0F xen/xenbus_dev.h 123 'B' 00-0F xen/xenbus_dev.h conflict!
124 'C' all linux/soundcard.h 124 'C' all linux/soundcard.h conflict!
125 'C' 01-2F linux/capi.h 125 'C' 01-2F linux/capi.h conflict!
126 'C' F0-FF drivers/net/wan/cosa.h 126 'C' F0-FF drivers/net/wan/cosa.h conflict!
127 'D' all arch/s390/include/asm/dasd.h 127 'D' all arch/s390/include/asm/dasd.h
128 'D' 40-5F drivers/scsi/dpt/dtpi_ioctl.h 128 'D' 40-5F drivers/scsi/dpt/dtpi_ioctl.h Dead since 2022
129 'D' 05 drivers/scsi/pmcraid.h 129 'D' 05 drivers/scsi/pmcraid.h
130 'E' all linux/input.h 130 'E' all linux/input.h conflict!
131 'E' 00-0F xen/evtchn.h 131 'E' 00-0F xen/evtchn.h conflict!
132 'F' all linux/fb.h 132 'F' all linux/fb.h conflict!
133 'F' 01-02 drivers/scsi/pmcraid.h 133 'F' 01-02 drivers/scsi/pmcraid.h conflict!
134 'F' 20 drivers/video/fsl-diu-fb.h 134 'F' 20 drivers/video/fsl-diu-fb.h conflict!
135 'F' 20 linux/ivtvfb.h 135 'F' 20 linux/ivtvfb.h conflict!
136 'F' 20 linux/matroxfb.h 136 'F' 20 linux/matroxfb.h conflict!
137 'F' 20 drivers/video/aty/atyfb_base.c 137 'F' 20 drivers/video/aty/atyfb_base.c conflict!
138 'F' 00-0F video/da8xx-fb.h 138 'F' 00-0F video/da8xx-fb.h conflict!
139 'F' 80-8F linux/arcfb.h 139 'F' 80-8F linux/arcfb.h conflict!
140 'F' DD video/sstfb.h 140 'F' DD video/sstfb.h conflict!
141 'G' 00-3F drivers/misc/sgi-gru/grulib.h 141 'G' 00-3F drivers/misc/sgi-gru/grulib.h conflict!
142 'G' 00-0F xen/gntalloc.h, xen/gntdev.h 142 'G' 00-0F xen/gntalloc.h, xen/gntdev.h conflict!
143 'H' 00-7F linux/hiddev.h 143 'H' 00-7F linux/hiddev.h conflict!
144 'H' 00-0F linux/hidraw.h 144 'H' 00-0F linux/hidraw.h conflict!
145 'H' 01 linux/mei.h 145 'H' 01 linux/mei.h conflict!
146 'H' 02 linux/mei.h 146 'H' 02 linux/mei.h conflict!
147 'H' 03 linux/mei.h 147 'H' 03 linux/mei.h conflict!
148 'H' 00-0F sound/asound.h 148 'H' 00-0F sound/asound.h conflict!
149 'H' 20-40 sound/asound_fm.h 149 'H' 20-40 sound/asound_fm.h conflict!
150 'H' 80-8F sound/sfnt_info.h 150 'H' 80-8F sound/sfnt_info.h conflict!
151 'H' 10-8F sound/emu10k1.h 151 'H' 10-8F sound/emu10k1.h conflict!
152 'H' 10-1F sound/sb16_csp.h 152 'H' 10-1F sound/sb16_csp.h conflict!
153 'H' 10-1F sound/hda_hwdep.h 153 'H' 10-1F sound/hda_hwdep.h conflict!
154 'H' 40-4F sound/hdspm.h 154 'H' 40-4F sound/hdspm.h conflict!
155 'H' 40-4F sound/hdsp.h 155 'H' 40-4F sound/hdsp.h conflict!
156 'H' 90 sound/usb/usx2y/usb_stream.h 156 'H' 90 sound/usb/usx2y/usb_stream.h
157 'H' 00-0F uapi/misc/habanalabs.h 157 'H' 00-0F uapi/misc/habanalabs.h conflict!
158 'H' A0 uapi/linux/usb/cdc-wdm.h 158 'H' A0 uapi/linux/usb/cdc-wdm.h
159 'H' C0-F0 net/bluetooth/hci.h 159 'H' C0-F0 net/bluetooth/hci.h conflict!
160 'H' C0-DF net/bluetooth/hidp/hidp.h 160 'H' C0-DF net/bluetooth/hidp/hidp.h conflict!
161 'H' C0-DF net/bluetooth/cmtp/cmtp.h 161 'H' C0-DF net/bluetooth/cmtp/cmtp.h conflict!
162 'H' C0-DF net/bluetooth/bnep/bnep.h 162 'H' C0-DF net/bluetooth/bnep/bnep.h conflict!
163 'H' F1 linux/hid-roccat.h < 163 'H' F1 linux/hid-roccat.h <mailto:erazor_de@users.sourceforge.net>
164 'H' F8-FA sound/firewire.h 164 'H' F8-FA sound/firewire.h
165 'I' all linux/isdn.h 165 'I' all linux/isdn.h conflict!
166 'I' 00-0F drivers/isdn/divert/isdn_divert.h 166 'I' 00-0F drivers/isdn/divert/isdn_divert.h conflict!
167 'I' 40-4F linux/mISDNif.h 167 'I' 40-4F linux/mISDNif.h conflict!
168 'K' all linux/kd.h 168 'K' all linux/kd.h
169 'L' 00-1F linux/loop.h 169 'L' 00-1F linux/loop.h conflict!
170 'L' 10-1F drivers/scsi/mpt3sas/mpt3sas_ctl. 170 'L' 10-1F drivers/scsi/mpt3sas/mpt3sas_ctl.h conflict!
171 'L' E0-FF linux/ppdd.h 171 'L' E0-FF linux/ppdd.h encrypted disk device driver
172 172 <http://linux01.gwdg.de/~alatham/ppdd.html>
173 'M' all linux/soundcard.h 173 'M' all linux/soundcard.h conflict!
174 'M' 01-16 mtd/mtd-abi.h 174 'M' 01-16 mtd/mtd-abi.h conflict!
175 and drivers/mtd/mtdchar.c 175 and drivers/mtd/mtdchar.c
176 'M' 01-03 drivers/scsi/megaraid/megaraid_sa 176 'M' 01-03 drivers/scsi/megaraid/megaraid_sas.h
177 'M' 00-0F drivers/video/fsl-diu-fb.h 177 'M' 00-0F drivers/video/fsl-diu-fb.h conflict!
178 'N' 00-1F drivers/usb/scanner.h 178 'N' 00-1F drivers/usb/scanner.h
179 'N' 40-7F drivers/block/nvme.c 179 'N' 40-7F drivers/block/nvme.c
180 'N' 80-8F uapi/linux/ntsync.h 180 'N' 80-8F uapi/linux/ntsync.h NT synchronization primitives
181 < 181 <mailto:wine-devel@winehq.org>
182 'O' 00-06 mtd/ubi-user.h 182 'O' 00-06 mtd/ubi-user.h UBI
183 'P' all linux/soundcard.h 183 'P' all linux/soundcard.h conflict!
184 'P' 60-6F sound/sscape_ioctl.h 184 'P' 60-6F sound/sscape_ioctl.h conflict!
185 'P' 00-0F drivers/usb/class/usblp.c 185 'P' 00-0F drivers/usb/class/usblp.c conflict!
186 'P' 01-09 drivers/misc/pci_endpoint_test.c 186 'P' 01-09 drivers/misc/pci_endpoint_test.c conflict!
187 'P' 00-0F xen/privcmd.h 187 'P' 00-0F xen/privcmd.h conflict!
188 'P' 00-05 linux/tps6594_pfsm.h 188 'P' 00-05 linux/tps6594_pfsm.h conflict!
189 'Q' all linux/soundcard.h 189 'Q' all linux/soundcard.h
190 'R' 00-1F linux/random.h 190 'R' 00-1F linux/random.h conflict!
191 'R' 01 linux/rfkill.h 191 'R' 01 linux/rfkill.h conflict!
192 'R' 20-2F linux/trace_mmap.h 192 'R' 20-2F linux/trace_mmap.h
193 'R' C0-DF net/bluetooth/rfcomm.h 193 'R' C0-DF net/bluetooth/rfcomm.h
194 'R' E0 uapi/linux/fsl_mc.h 194 'R' E0 uapi/linux/fsl_mc.h
195 'S' all linux/cdrom.h 195 'S' all linux/cdrom.h conflict!
196 'S' 80-81 scsi/scsi_ioctl.h 196 'S' 80-81 scsi/scsi_ioctl.h conflict!
197 'S' 82-FF scsi/scsi.h 197 'S' 82-FF scsi/scsi.h conflict!
198 'S' 00-7F sound/asequencer.h 198 'S' 00-7F sound/asequencer.h conflict!
199 'T' all linux/soundcard.h 199 'T' all linux/soundcard.h conflict!
200 'T' 00-AF sound/asound.h 200 'T' 00-AF sound/asound.h conflict!
201 'T' all arch/x86/include/asm/ioctls.h 201 'T' all arch/x86/include/asm/ioctls.h conflict!
202 'T' C0-DF linux/if_tun.h 202 'T' C0-DF linux/if_tun.h conflict!
203 'U' all sound/asound.h 203 'U' all sound/asound.h conflict!
204 'U' 00-CF linux/uinput.h 204 'U' 00-CF linux/uinput.h conflict!
205 'U' 00-EF linux/usbdevice_fs.h 205 'U' 00-EF linux/usbdevice_fs.h
206 'U' C0-CF drivers/bluetooth/hci_uart.h 206 'U' C0-CF drivers/bluetooth/hci_uart.h
207 'V' all linux/vt.h 207 'V' all linux/vt.h conflict!
208 'V' all linux/videodev2.h 208 'V' all linux/videodev2.h conflict!
209 'V' C0 linux/ivtvfb.h 209 'V' C0 linux/ivtvfb.h conflict!
210 'V' C0 linux/ivtv.h 210 'V' C0 linux/ivtv.h conflict!
211 'V' C0 media/si4713.h 211 'V' C0 media/si4713.h conflict!
212 'W' 00-1F linux/watchdog.h 212 'W' 00-1F linux/watchdog.h conflict!
213 'W' 00-1F linux/wanrouter.h 213 'W' 00-1F linux/wanrouter.h conflict! (pre 3.9)
214 'W' 00-3F sound/asound.h 214 'W' 00-3F sound/asound.h conflict!
215 'W' 40-5F drivers/pci/switch/switchtec.c 215 'W' 40-5F drivers/pci/switch/switchtec.c
216 'W' 60-61 linux/watch_queue.h 216 'W' 60-61 linux/watch_queue.h
217 'X' all fs/xfs/xfs_fs.h, 217 'X' all fs/xfs/xfs_fs.h, conflict!
218 fs/xfs/linux-2.6/xfs_ioctl32.h, 218 fs/xfs/linux-2.6/xfs_ioctl32.h,
219 include/linux/falloc.h, 219 include/linux/falloc.h,
220 linux/fs.h, 220 linux/fs.h,
221 'X' all fs/ocfs2/ocfs_fs.h 221 'X' all fs/ocfs2/ocfs_fs.h conflict!
222 'X' 01 linux/pktcdvd.h 222 'X' 01 linux/pktcdvd.h conflict!
223 'Z' 14-15 drivers/message/fusion/mptctl.h 223 'Z' 14-15 drivers/message/fusion/mptctl.h
224 '[' 00-3F linux/usb/tmc.h 224 '[' 00-3F linux/usb/tmc.h USB Test and Measurement Devices
225 < 225 <mailto:gregkh@linuxfoundation.org>
226 'a' all linux/atm*.h, linux/sonet.h 226 'a' all linux/atm*.h, linux/sonet.h ATM on linux
227 227 <http://lrcwww.epfl.ch/>
228 'a' 00-0F drivers/crypto/qat/qat_common/adf 228 'a' 00-0F drivers/crypto/qat/qat_common/adf_cfg_common.h conflict! qat driver
229 'b' 00-FF 229 'b' 00-FF conflict! bit3 vme host bridge
230 < 230 <mailto:natalia@nikhefk.nikhef.nl>
231 'b' 00-0F linux/dma-buf.h 231 'b' 00-0F linux/dma-buf.h conflict!
232 'c' 00-7F linux/comstats.h 232 'c' 00-7F linux/comstats.h conflict!
233 'c' 00-7F linux/coda.h 233 'c' 00-7F linux/coda.h conflict!
234 'c' 00-1F linux/chio.h 234 'c' 00-1F linux/chio.h conflict!
235 'c' 80-9F arch/s390/include/asm/chsc.h 235 'c' 80-9F arch/s390/include/asm/chsc.h conflict!
236 'c' A0-AF arch/x86/include/asm/msr.h confli 236 'c' A0-AF arch/x86/include/asm/msr.h conflict!
237 'd' 00-FF linux/char/drm/drm.h 237 'd' 00-FF linux/char/drm/drm.h conflict!
238 'd' 02-40 pcmcia/ds.h 238 'd' 02-40 pcmcia/ds.h conflict!
239 'd' F0-FF linux/digi1.h 239 'd' F0-FF linux/digi1.h
240 'e' all linux/digi1.h 240 'e' all linux/digi1.h conflict!
241 'f' 00-1F linux/ext2_fs.h 241 'f' 00-1F linux/ext2_fs.h conflict!
242 'f' 00-1F linux/ext3_fs.h 242 'f' 00-1F linux/ext3_fs.h conflict!
243 'f' 00-0F fs/jfs/jfs_dinode.h 243 'f' 00-0F fs/jfs/jfs_dinode.h conflict!
244 'f' 00-0F fs/ext4/ext4.h 244 'f' 00-0F fs/ext4/ext4.h conflict!
245 'f' 00-0F linux/fs.h 245 'f' 00-0F linux/fs.h conflict!
246 'f' 00-0F fs/ocfs2/ocfs2_fs.h 246 'f' 00-0F fs/ocfs2/ocfs2_fs.h conflict!
247 'f' 13-27 linux/fscrypt.h 247 'f' 13-27 linux/fscrypt.h
248 'f' 81-8F linux/fsverity.h 248 'f' 81-8F linux/fsverity.h
249 'g' 00-0F linux/usb/gadgetfs.h 249 'g' 00-0F linux/usb/gadgetfs.h
250 'g' 20-2F linux/usb/g_printer.h 250 'g' 20-2F linux/usb/g_printer.h
251 'h' 00-7F 251 'h' 00-7F conflict! Charon filesystem
252 < 252 <mailto:zapman@interlan.net>
253 'h' 00-1F linux/hpet.h 253 'h' 00-1F linux/hpet.h conflict!
254 'h' 80-8F fs/hfsplus/ioctl.c 254 'h' 80-8F fs/hfsplus/ioctl.c
255 'i' 00-3F linux/i2o-dev.h 255 'i' 00-3F linux/i2o-dev.h conflict!
256 'i' 0B-1F linux/ipmi.h 256 'i' 0B-1F linux/ipmi.h conflict!
257 'i' 80-8F linux/i8k.h 257 'i' 80-8F linux/i8k.h
258 'i' 90-9F `linux/iio/*.h` 258 'i' 90-9F `linux/iio/*.h` IIO
259 'j' 00-3F linux/joystick.h 259 'j' 00-3F linux/joystick.h
260 'k' 00-0F linux/spi/spidev.h 260 'k' 00-0F linux/spi/spidev.h conflict!
261 'k' 00-05 video/kyro.h 261 'k' 00-05 video/kyro.h conflict!
262 'k' 10-17 linux/hsi/hsi_char.h 262 'k' 10-17 linux/hsi/hsi_char.h HSI character device
263 'l' 00-3F linux/tcfs_fs.h 263 'l' 00-3F linux/tcfs_fs.h transparent cryptographic file system
264 264 <http://web.archive.org/web/%2A/http://mikonos.dia.unisa.it/tcfs>
265 'l' 40-7F linux/udf_fs_i.h 265 'l' 40-7F linux/udf_fs_i.h in development:
266 266 <https://github.com/pali/udftools>
267 'm' 00-09 linux/mmtimer.h 267 'm' 00-09 linux/mmtimer.h conflict!
268 'm' all linux/mtio.h 268 'm' all linux/mtio.h conflict!
269 'm' all linux/soundcard.h 269 'm' all linux/soundcard.h conflict!
270 'm' all linux/synclink.h 270 'm' all linux/synclink.h conflict!
271 'm' 00-19 drivers/message/fusion/mptctl.h 271 'm' 00-19 drivers/message/fusion/mptctl.h conflict!
272 'm' 00 drivers/scsi/megaraid/megaraid_io 272 'm' 00 drivers/scsi/megaraid/megaraid_ioctl.h conflict!
273 'n' 00-7F linux/ncp_fs.h and fs/ncpfs/ioctl 273 'n' 00-7F linux/ncp_fs.h and fs/ncpfs/ioctl.c
274 'n' 80-8F uapi/linux/nilfs2_api.h 274 'n' 80-8F uapi/linux/nilfs2_api.h NILFS2
275 'n' E0-FF linux/matroxfb.h 275 'n' E0-FF linux/matroxfb.h matroxfb
276 'o' 00-1F fs/ocfs2/ocfs2_fs.h 276 'o' 00-1F fs/ocfs2/ocfs2_fs.h OCFS2
277 'o' 00-03 mtd/ubi-user.h 277 'o' 00-03 mtd/ubi-user.h conflict! (OCFS2 and UBI overlaps)
278 'o' 40-41 mtd/ubi-user.h 278 'o' 40-41 mtd/ubi-user.h UBI
279 'o' 01-A1 `linux/dvb/*.h` 279 'o' 01-A1 `linux/dvb/*.h` DVB
280 'p' 00-0F linux/phantom.h 280 'p' 00-0F linux/phantom.h conflict! (OpenHaptics needs this)
281 'p' 00-1F linux/rtc.h 281 'p' 00-1F linux/rtc.h conflict!
282 'p' 40-7F linux/nvram.h 282 'p' 40-7F linux/nvram.h
283 'p' 80-9F linux/ppdev.h 283 'p' 80-9F linux/ppdev.h user-space parport
284 < 284 <mailto:tim@cyberelk.net>
285 'p' A1-A5 linux/pps.h 285 'p' A1-A5 linux/pps.h LinuxPPS
286 < 286 <mailto:giometti@linux.it>
287 'q' 00-1F linux/serio.h 287 'q' 00-1F linux/serio.h
288 'q' 80-FF linux/telephony.h 288 'q' 80-FF linux/telephony.h Internet PhoneJACK, Internet LineJACK
289 linux/ixjuser.h 289 linux/ixjuser.h <http://web.archive.org/web/%2A/http://www.quicknet.net>
290 'r' 00-1F linux/msdos_fs.h and fs/fat/dir.c 290 'r' 00-1F linux/msdos_fs.h and fs/fat/dir.c
291 's' all linux/cdk.h 291 's' all linux/cdk.h
292 't' 00-7F linux/ppp-ioctl.h 292 't' 00-7F linux/ppp-ioctl.h
293 't' 80-8F linux/isdn_ppp.h 293 't' 80-8F linux/isdn_ppp.h
294 't' 90-91 linux/toshiba.h 294 't' 90-91 linux/toshiba.h toshiba and toshiba_acpi SMM
295 'u' 00-1F linux/smb_fs.h 295 'u' 00-1F linux/smb_fs.h gone
296 'u' 00-2F linux/ublk_cmd.h 296 'u' 00-2F linux/ublk_cmd.h conflict!
297 'u' 20-3F linux/uvcvideo.h 297 'u' 20-3F linux/uvcvideo.h USB video class host driver
298 'u' 40-4f linux/udmabuf.h 298 'u' 40-4f linux/udmabuf.h userspace dma-buf misc device
299 'v' 00-1F linux/ext2_fs.h 299 'v' 00-1F linux/ext2_fs.h conflict!
300 'v' 00-1F linux/fs.h 300 'v' 00-1F linux/fs.h conflict!
301 'v' 00-0F linux/sonypi.h 301 'v' 00-0F linux/sonypi.h conflict!
302 'v' 00-0F media/v4l2-subdev.h 302 'v' 00-0F media/v4l2-subdev.h conflict!
303 'v' 20-27 arch/powerpc/include/uapi/asm/vas 303 'v' 20-27 arch/powerpc/include/uapi/asm/vas-api.h VAS API
304 'v' C0-FF linux/meye.h 304 'v' C0-FF linux/meye.h conflict!
305 'w' all 305 'w' all CERN SCI driver
306 'y' 00-1F 306 'y' 00-1F packet based user level communications
307 < 307 <mailto:zapman@interlan.net>
308 'z' 00-3F 308 'z' 00-3F CAN bus card conflict!
309 < 309 <mailto:hdstich@connectu.ulm.circular.de>
310 'z' 40-7F 310 'z' 40-7F CAN bus card conflict!
311 < 311 <mailto:oe@port.de>
312 'z' 10-4F drivers/s390/crypto/zcrypt_api.h 312 'z' 10-4F drivers/s390/crypto/zcrypt_api.h conflict!
313 '|' 00-7F linux/media.h 313 '|' 00-7F linux/media.h
314 0x80 00-1F linux/fb.h 314 0x80 00-1F linux/fb.h
315 0x81 00-1F linux/vduse.h 315 0x81 00-1F linux/vduse.h
316 0x89 00-06 arch/x86/include/asm/sockios.h 316 0x89 00-06 arch/x86/include/asm/sockios.h
317 0x89 0B-DF linux/sockios.h 317 0x89 0B-DF linux/sockios.h
318 0x89 E0-EF linux/sockios.h 318 0x89 E0-EF linux/sockios.h SIOCPROTOPRIVATE range
319 0x89 F0-FF linux/sockios.h 319 0x89 F0-FF linux/sockios.h SIOCDEVPRIVATE range
320 0x8A 00-1F linux/eventpoll.h 320 0x8A 00-1F linux/eventpoll.h
321 0x8B all linux/wireless.h 321 0x8B all linux/wireless.h
322 0x8C 00-3F 322 0x8C 00-3F WiNRADiO driver
323 323 <http://www.winradio.com.au/>
324 0x90 00 drivers/cdrom/sbpcd.h 324 0x90 00 drivers/cdrom/sbpcd.h
325 0x92 00-0F drivers/usb/mon/mon_bin.c 325 0x92 00-0F drivers/usb/mon/mon_bin.c
326 0x93 60-7F linux/auto_fs.h 326 0x93 60-7F linux/auto_fs.h
327 0x94 all fs/btrfs/ioctl.h 327 0x94 all fs/btrfs/ioctl.h Btrfs filesystem
328 and linux/fs.h 328 and linux/fs.h some lifted to vfs/generic
329 0x97 00-7F fs/ceph/ioctl.h 329 0x97 00-7F fs/ceph/ioctl.h Ceph file system
330 0x99 00-0F 330 0x99 00-0F 537-Addinboard driver
331 < 331 <mailto:buk@buks.ipn.de>
332 0xA0 all linux/sdp/sdp.h 332 0xA0 all linux/sdp/sdp.h Industrial Device Project
333 < 333 <mailto:kenji@bitgate.com>
334 0xA1 0 linux/vtpm_proxy.h 334 0xA1 0 linux/vtpm_proxy.h TPM Emulator Proxy Driver
335 0xA2 all uapi/linux/acrn.h 335 0xA2 all uapi/linux/acrn.h ACRN hypervisor
336 0xA3 80-8F 336 0xA3 80-8F Port ACL in development:
337 < 337 <mailto:tlewis@mindspring.com>
338 0xA3 90-9F linux/dtlk.h 338 0xA3 90-9F linux/dtlk.h
339 0xA4 00-1F uapi/linux/tee.h 339 0xA4 00-1F uapi/linux/tee.h Generic TEE subsystem
340 0xA4 00-1F uapi/asm/sgx.h < 340 0xA4 00-1F uapi/asm/sgx.h <mailto:linux-sgx@vger.kernel.org>
341 0xA5 01-05 linux/surface_aggregator/cdev.h 341 0xA5 01-05 linux/surface_aggregator/cdev.h Microsoft Surface Platform System Aggregator
342 < 342 <mailto:luzmaximilian@gmail.com>
343 0xA5 20-2F linux/surface_aggregator/dtx.h 343 0xA5 20-2F linux/surface_aggregator/dtx.h Microsoft Surface DTX driver
344 < 344 <mailto:luzmaximilian@gmail.com>
345 0xAA 00-3F linux/uapi/linux/userfaultfd.h 345 0xAA 00-3F linux/uapi/linux/userfaultfd.h
346 0xAB 00-1F linux/nbd.h 346 0xAB 00-1F linux/nbd.h
347 0xAC 00-1F linux/raw.h 347 0xAC 00-1F linux/raw.h
348 0xAD 00 348 0xAD 00 Netfilter device in development:
349 < 349 <mailto:rusty@rustcorp.com.au>
350 0xAE 00-1F linux/kvm.h 350 0xAE 00-1F linux/kvm.h Kernel-based Virtual Machine
351 < 351 <mailto:kvm@vger.kernel.org>
352 0xAE 40-FF linux/kvm.h 352 0xAE 40-FF linux/kvm.h Kernel-based Virtual Machine
353 < 353 <mailto:kvm@vger.kernel.org>
354 0xAE 20-3F linux/nitro_enclaves.h 354 0xAE 20-3F linux/nitro_enclaves.h Nitro Enclaves
355 0xAF 00-1F linux/fsl_hypervisor.h 355 0xAF 00-1F linux/fsl_hypervisor.h Freescale hypervisor
356 0xB0 all 356 0xB0 all RATIO devices in development:
357 < 357 <mailto:vgo@ratio.de>
358 0xB1 00-1F 358 0xB1 00-1F PPPoX
359 < 359 <mailto:mostrows@styx.uwaterloo.ca>
360 0xB2 00 arch/powerpc/include/uapi/asm/pap 360 0xB2 00 arch/powerpc/include/uapi/asm/papr-vpd.h powerpc/pseries VPD API
361 361 <mailto:linuxppc-dev>
362 0xB2 01-02 arch/powerpc/include/uapi/asm/pap 362 0xB2 01-02 arch/powerpc/include/uapi/asm/papr-sysparm.h powerpc/pseries system parameter API
363 363 <mailto:linuxppc-dev>
364 0xB3 00 linux/mmc/ioctl.h 364 0xB3 00 linux/mmc/ioctl.h
365 0xB4 00-0F linux/gpio.h < 365 0xB4 00-0F linux/gpio.h <mailto:linux-gpio@vger.kernel.org>
366 0xB5 00-0F uapi/linux/rpmsg.h < 366 0xB5 00-0F uapi/linux/rpmsg.h <mailto:linux-remoteproc@vger.kernel.org>
367 0xB6 all linux/fpga-dfl.h 367 0xB6 all linux/fpga-dfl.h
368 0xB7 all uapi/linux/remoteproc_cdev.h < 368 0xB7 all uapi/linux/remoteproc_cdev.h <mailto:linux-remoteproc@vger.kernel.org>
369 0xB7 all uapi/linux/nsfs.h < 369 0xB7 all uapi/linux/nsfs.h <mailto:Andrei Vagin <avagin@openvz.org>>
370 0xB8 01-02 uapi/misc/mrvl_cn10k_dpi.h 370 0xB8 01-02 uapi/misc/mrvl_cn10k_dpi.h Marvell CN10K DPI driver
371 0xC0 00-0F linux/usb/iowarrior.h 371 0xC0 00-0F linux/usb/iowarrior.h
372 0xCA 00-0F uapi/misc/cxl.h 372 0xCA 00-0F uapi/misc/cxl.h
373 0xCA 10-2F uapi/misc/ocxl.h 373 0xCA 10-2F uapi/misc/ocxl.h
374 0xCA 80-BF uapi/scsi/cxlflash_ioctl.h 374 0xCA 80-BF uapi/scsi/cxlflash_ioctl.h
375 0xCB 00-1F 375 0xCB 00-1F CBM serial IEC bus in development:
376 < 376 <mailto:michael.klein@puffin.lb.shuttle.de>
377 0xCC 00-0F drivers/misc/ibmvmc.h 377 0xCC 00-0F drivers/misc/ibmvmc.h pseries VMC driver
378 0xCD 01 linux/reiserfs_fs.h 378 0xCD 01 linux/reiserfs_fs.h
379 0xCE 01-02 uapi/linux/cxl_mem.h 379 0xCE 01-02 uapi/linux/cxl_mem.h Compute Express Link Memory Devices
380 0xCF 02 fs/smb/client/cifs_ioctl.h 380 0xCF 02 fs/smb/client/cifs_ioctl.h
381 0xDB 00-0F drivers/char/mwave/mwavepub.h 381 0xDB 00-0F drivers/char/mwave/mwavepub.h
382 0xDD 00-3F 382 0xDD 00-3F ZFCP device driver see drivers/s390/scsi/
383 < 383 <mailto:aherrman@de.ibm.com>
384 0xE5 00-3F linux/fuse.h 384 0xE5 00-3F linux/fuse.h
385 0xEC 00-01 drivers/platform/chrome/cros_ec_d 385 0xEC 00-01 drivers/platform/chrome/cros_ec_dev.h ChromeOS EC driver
386 0xEE 00-09 uapi/linux/pfrut.h 386 0xEE 00-09 uapi/linux/pfrut.h Platform Firmware Runtime Update and Telemetry
387 0xF3 00-3F drivers/usb/misc/sisusbvga/sisusb 387 0xF3 00-3F drivers/usb/misc/sisusbvga/sisusb.h sisfb (in development)
388 < 388 <mailto:thomas@winischhofer.net>
389 0xF6 all 389 0xF6 all LTTng Linux Trace Toolkit Next Generation
390 < 390 <mailto:mathieu.desnoyers@efficios.com>
391 0xF8 all arch/x86/include/uapi/asm/amd_hsm 391 0xF8 all arch/x86/include/uapi/asm/amd_hsmp.h AMD HSMP EPYC system management interface driver
392 < 392 <mailto:nchatrad@amd.com>
393 0xFD all linux/dm-ioctl.h 393 0xFD all linux/dm-ioctl.h
394 0xFE all linux/isst_if.h 394 0xFE all linux/isst_if.h
395 ==== ===== ================================= 395 ==== ===== ======================================================= ================================================================
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