I'm writing a line discipline for a serial port multiplexing hardware
which turns one "upstream" serial port into 0-8 slower "downstream"
serial ports, according to the number of modules installed on the
multiplexer.
The attaching program transfers no data on the upstream port, all
data will be to/from the ldisc itself, or to/from the downstream
ports.
To know which modules are installed, and their configuration, the
ldisc needs to perform a handshake using the same packet format as
downstream port data transfers.
It would be nice to do this handshake in ldisc_open() so that the
attach can fail if the hardware is not responding or just not
connected.
Since the packet format is the same it would be easy to reuse the
normal ldisc receive path for the handshake, however the ldisc would
not see the response until after ldisc_open() has succeeded.
Catch-22!
I'm hoping to use ldattach for attaching the ldisc because it's nice
to have a standard utility, because it's nice to not duplicate the
packet formatting/parsing code, and because the ldisc has to know
which modules are installed in the hardware anyway, to create the
correct downstream ports.
Can you suggest a solution to this problem? Ideally one that can be
contained in the ldisc.
Thanks
//Peter
> Since the packet format is the same it would be easy to reuse the
> normal ldisc receive path for the handshake, however the ldisc would
> not see the response until after ldisc_open() has succeeded.
Indeed.
> Can you suggest a solution to this problem? Ideally one that can be
> contained in the ldisc.
Similar problem with the GSM mux I've been working on. I've gone for
making the ldisc attach always work and then kicking things off via an
ioctl which sets the desired mode/parameters/encoding.
Alan Cox wrote:
> > Can you suggest a solution to this problem? Ideally one that can be
> > contained in the ldisc.
>
> Similar problem with the GSM mux I've been working on. I've gone for
> making the ldisc attach always work and then kicking things off via an
> ioctl which sets the desired mode/parameters/encoding.
I'll do the same. Did you add a new ioctl for this, or use an
existing one?
Thanks!
//Peter
On Thu, 15 Oct 2009 23:46:42 +0200
Peter Stuge <[email protected]> wrote:
> Alan Cox wrote:
> > > Can you suggest a solution to this problem? Ideally one that can be
> > > contained in the ldisc.
> >
> > Similar problem with the GSM mux I've been working on. I've gone for
> > making the ldisc attach always work and then kicking things off via an
> > ioctl which sets the desired mode/parameters/encoding.
>
> I'll do the same. Did you add a new ioctl for this, or use an
> existing one?
I added a private one - given I needed to pass the adaption layer code,
gsm mux level and whether we were initiator or not it didn't really fit
anything generic in the tty layer.
Alan Cox wrote:
> > > Similar problem with the GSM mux I've been working on. I've gone for
> > > making the ldisc attach always work and then kicking things off via an
> > > ioctl which sets the desired mode/parameters/encoding.
> >
> > I'll do the same. Did you add a new ioctl for this, or use an
> > existing one?
>
> I added a private one - given I needed to pass the adaption layer code,
> gsm mux level and whether we were initiator or not it didn't really fit
> anything generic in the tty layer.
I was trying to reuse an existing ioctl, partly because I'm not sure
how to add a one and partly because fewer are better, but
TIOCSERCONFIG which seemed fitting does not appear to be passed on to
my ldisc. :\
Should I make a new one (what does private mean here btw?) and how do
I do it exactly? Is patching Documentation/ioctl/ioctl-number.txt and
asm/ioctls.h all? The "addressing" in ioctl-number seems a little
chaotic, do I just pick anything that is available?
//Peter
Peter Stuge wrote:
> Is patching Documentation/ioctl/ioctl-number.txt and
> asm/ioctls.h all?
I added an ioctl into a header of my own. It works fine, but..
> The "addressing" in ioctl-number seems a little chaotic, do I just
> pick anything that is available?
Documentation/ioctl/ioctl-number.txt seems out of date. I picked
a number that was used (by linux/toshiba.h) but not listed. Do I have
to grep it out?
//Peter
On Mon, 19 Oct 2009 00:33:06 +0200 Peter Stuge wrote:
> Peter Stuge wrote:
> > Is patching Documentation/ioctl/ioctl-number.txt and
> > asm/ioctls.h all?
>
> I added an ioctl into a header of my own. It works fine, but..
>
>
> > The "addressing" in ioctl-number seems a little chaotic, do I just
> > pick anything that is available?
>
> Documentation/ioctl/ioctl-number.txt seems out of date. I picked
> a number that was used (by linux/toshiba.h) but not listed. Do I have
> to grep it out?
Can you at least list what files/drivers need to be added to
Documentation/ioctl/ioctl-number.txt, please?
---
~Randy
Randy Dunlap wrote:
> > Documentation/ioctl/ioctl-number.txt seems out of date. I picked
> > a number that was used (by linux/toshiba.h) but not listed. Do I
> > have to grep it out?
>
> Can you at least list what files/drivers need to be added to
> Documentation/ioctl/ioctl-number.txt, please?
Linus' include/linux/toshiba.h has a single ioctl:
#define TOSH_SMM _IOWR('t', 0x90, int) /* broken: meant 24 bytes */
Maybe I picked the only unlisted number? :)
//Peter
From: Randy Dunlap <[email protected]>
Add many ioctl definitions to ioctl-number.txt.
Fix some whitespace/formatting.
Correct some filenames/paths.
Signed-off-by: Randy Dunlap <[email protected]>
---
Documentation/ioctl/ioctl-number.txt | 203 +++++++++++++++++++------
1 file changed, 159 insertions(+), 44 deletions(-)
--- lnx-2632-rc5.orig/Documentation/ioctl/ioctl-number.txt
+++ lnx-2632-rc5/Documentation/ioctl/ioctl-number.txt
@@ -56,10 +56,11 @@ Following this convention is good becaus
(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/i386. It contains
-most drivers up to 2.3.14, but I know I am missing some.
+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# Include File Comments
+Code Seq#(hex) Include File Comments
========================================================
0x00 00-1F linux/fs.h conflict!
0x00 00-1F scsi/scsi_ioctl.h conflict!
@@ -69,119 +70,228 @@ Code Seq# Include File Comments
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/md.h
+0x09 all linux/raid/md_u.h
+0x10 00-0F drivers/char/s390/vmcp.h
0x12 all linux/fs.h
linux/blkpg.h
0x1b all InfiniBand Subsystem <http://www.openib.org/>
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
'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:[email protected]>
-'A' 00-1F linux/apm_bios.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:[email protected]>
-'C' all linux/soundcard.h
+'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
-'E' all linux/input.h
-'F' all linux/fb.h
-'H' all linux/hiddev.h
-'I' all linux/isdn.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' 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' 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!
+'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
-'L' 20-2F driver/usb/misc/vstusb.h
+'L' 00-1F linux/loop.h conflict!
+'L' 10-1F drivers/scsi/mpt2sas/mpt2sas_ctl.h conflict!
+'L' 20-2F linux/usb/vstusb.h
'L' E0-FF linux/ppdd.h encrypted disk device driver
<http://linux01.gwdg.de/~alatham/ppdd.html>
-'M' all linux/soundcard.h
+'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
-'O' 00-02 include/mtd/ubi-user.h UBI
-'P' all linux/soundcard.h
+'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!
'Q' all linux/soundcard.h
-'R' 00-1F linux/random.h
+'R' 00-1F linux/random.h conflict!
+'R' 01 linux/rfkill.h conflict!
+'R' 01-0F media/rds.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!
-'U' 00-EF linux/drivers/usb/usb.h
-'V' all linux/vt.h
+'T' C0-DF linux/if_tun.h conflict!
+'U' all sound/asound.h conflict!
+'U' 00-0F drivers/media/video/uvc/uvcvideo.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!
+'V' C0-CF drivers/media/video/mxb.h conflict!
'W' 00-1F linux/watchdog.h conflict!
'W' 00-1F linux/wanrouter.h conflict!
-'X' all linux/xfs_fs.h
+'W' 00-3F sound/asound.h conflict!
+'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
-'[' 00-07 linux/usb/usbtmc.h USB Test and Measurement Devices
+'Z' 14-15 drivers/message/fusion/mptctl.h
+'[' 00-07 linux/usb/tmc.h USB Test and Measurement Devices
<mailto:[email protected]>
-'a' all ATM on linux
+'a' all linux/atm*.h, linux/sonet.h ATM on linux
<http://lrcwww.epfl.ch/linux-atm/magic.html>
-'b' 00-FF bit3 vme host bridge
+'b' 00-FF conflict! bit3 vme host bridge
<mailto:[email protected]>
+'b' 00-0F media/bt819.h conflict!
+'c' all linux/cm4000_cs.h conflict!
'c' 00-7F linux/comstats.h conflict!
'c' 00-7F linux/coda.h conflict!
-'c' 80-9F arch/s390/include/asm/chsc.h
-'c' A0-AF arch/x86/include/asm/msr.h
+'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' 10-3F drivers/media/video/dabusb.h conflict!
+'d' C0-CF drivers/media/video/saa7191.h conflict!
'd' F0-FF linux/digi1.h
'e' all linux/digi1.h conflict!
-'e' 00-1F net/irda/irtty.h conflict!
-'f' 00-1F linux/ext2_fs.h
-'h' 00-7F Charon filesystem
+'e' 00-1F drivers/net/irda/irtty-sir.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:[email protected]>
-'i' 00-3F linux/i2o.h
+'h' 00-1F linux/hpet.h conflict!
+'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!
'l' 00-3F linux/tcfs_fs.h transparent cryptographic file system
<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
+'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!
'm' 00-1F net/irda/irmod.h conflict!
-'n' 00-7F linux/ncp_fs.h
+'n' 00-7F linux/ncp_fs.h and fs/ncpfs/ioctl.c
'n' 80-8F linux/nilfs2_fs.h NILFS2
-'n' E0-FF video/matrox.h matroxfb
+'n' E0-FF linux/matroxfb.h matroxfb
'o' 00-1F fs/ocfs2/ocfs2_fs.h OCFS2
-'o' 00-03 include/mtd/ubi-user.h conflict! (OCFS2 and UBI overlaps)
-'o' 40-41 include/mtd/ubi-user.h UBI
-'o' 01-A1 include/linux/dvb/*.h DVB
+'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 user-space parport
+'p' 80-9F linux/ppdev.h user-space parport
<mailto:[email protected]>
-'p' a1-a4 linux/pps.h LinuxPPS
+'p' A1-A4 linux/pps.h LinuxPPS
<mailto:[email protected]>
'q' 00-1F linux/serio.h
-'q' 80-FF Internet PhoneJACK, Internet LineJACK
- <http://www.quicknet.net>
-'r' 00-1F linux/msdos_fs.h
+'q' 80-FF linux/telephony.h Internet PhoneJACK, Internet LineJACK
+ linux/ixjuser.h <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/if_ppp.h
't' 80-8F linux/isdn_ppp.h
+'t' 90 linux/toshiba.h
'u' 00-1F linux/smb_fs.h
-'v' 00-1F linux/ext2_fs.h conflict!
'v' all linux/videodev.h conflict!
+'v' 00-1F linux/ext2_fs.h conflict!
+'v' 00-1F linux/fs.h conflict!
+'v' 00-0F linux/sonypi.h conflict!
+'v' C0-CF drivers/media/video/ov511.h conflict!
+'v' C0-DF media/pwc-ioctl.h conflict!
+'v' C0-FF linux/meye.h conflict!
+'v' C0-CF drivers/media/video/zoran/zoran.h conflict!
+'v' D0-DF drivers/media/video/cpia2/cpia2dev.h conflict!
'w' all CERN SCI driver
'y' 00-1F packet based user level communications
<mailto:[email protected]>
-'z' 00-3F CAN bus card
+'z' 00-3F CAN bus card conflict!
<mailto:[email protected]>
-'z' 40-7F CAN bus card
+'z' 40-7F CAN bus card conflict!
<mailto:[email protected]>
+'z' 10-4F drivers/s390/crypto/zcrypt_api.h conflict!
0x80 00-1F linux/fb.h
0x81 00-1F linux/videotext.h
+0x88 00-3F media/ovcamchip.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.proximity.com.au/~brian/winradio/>
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
0x99 00-0F 537-Addinboard driver
<mailto:[email protected]>
0xA0 all linux/sdp/sdp.h Industrial Device Project
@@ -192,17 +302,22 @@ Code Seq# Include File Comments
0xAB 00-1F linux/nbd.h
0xAC 00-1F linux/raw.h
0xAD 00 Netfilter device in development:
- <mailto:[email protected]>
+ <mailto:[email protected]>
0xAE all linux/kvm.h Kernel-based Virtual Machine
<mailto:[email protected]>
0xB0 all RATIO devices in development:
<mailto:[email protected]>
0xB1 00-1F PPPoX <mailto:[email protected]>
+0xC0 00-0F linux/usb/iowarrior.h
0xCB 00-1F CBM serial IEC bus in development:
<mailto:[email protected]>
+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:[email protected]>
-0xF3 00-3F video/sisfb.h sisfb (in development)
+0xF3 00-3F drivers/usb/misc/sisusbvga/sisusb.h sisfb (in development)
<mailto:[email protected]>
0xF4 00-1F video/mbxfb.h mbxfb
<mailto:[email protected]>
+0xFD all linux/dm-ioctl.h