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isdn/capi: fix (middleware) device nodes

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Since v2.4 the capi driver used the following device nodes if
"middleware" support was enabled:
    /dev/capi20
    /dev/capi/0
    /dev/capi/1
    [...]

/dev/capi20 is a character device node. /dev/capi/0 (and up) are tty
device nodes (with a different major).

This device node (naming) scheme is not documented anywhere, as far as I
know. It was originally provided by the capifs pseudo filesystem (before
udev became available). It is required for example by the pppd
capiplugin. It was supported until a few years ago. But a number of
developments broke it:
- v2.6.6 (May 2004) renamed /dev/capi20 to /dev/capi and removed the
  "/" from the name of capi's tty driver. The explanation of the patch
  that did this included two examples of udev rules "to restore the old
  namespace";
- either udev 154 (May 2010) or udev 179 (January 2012) stopped
  allowing to rename device nodes, and thus the ability to have
  /dev/capi20 appear instead of /dev/capi and /dev/capi/0 (and up)
  instead of /dev/capi0 (and up);
- v3.0 (July 2011) also removed capifs. That disabled another method to
  create the /dev/capi/0 (and up) device nodes.

So now users need to manually tweak their setup (eg, create /dev/capi/
and fill that with symlinks) to get things working. This is all rather
hacky and only discoverable by searching the web. Fix all this by
renaming /dev/capi back to /dev/capi20, and by setting the name of the
"capi_nc" tty driver to "capi!" so the tty device nodes appear as
/dev/capi/0 (and up).

Signed-off-by: Paul Bolle <[email protected]>
Signed-off-by: Tilman Schmidt <[email protected]>
Acked-by: Greg Kroah-Hartman <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Paul Bolle 2014-06-01 23:47:24 +02:00 • committed by David S. Miller
commit d1cadce15a
2 changed files with 3 additions and 3 deletions
Download patch file Download diff file Expand all files Collapse all files

2
drivers/isdn/capi/Kconfig
View file

@ -9,7 +9,7 @@ config CAPI_TRACE
If unsure, say Y.
config ISDN_CAPI_CAPI20
tristate "CAPI2.0 /dev/capi support"
tristate "CAPI2.0 /dev/capi20 support"
help
This option will provide the CAPI 2.0 interface to userspace
applications via /dev/capi20. Applications should use the

4
drivers/isdn/capi/capi.c
View file

@ -1271,7 +1271,7 @@ static int __init capinc_tty_init(void)
return -ENOMEM;
}
drv->driver_name = "capi_nc";
drv->name = "capi";
drv->name = "capi!";
drv->major = 0;
drv->minor_start = 0;
drv->type = TTY_DRIVER_TYPE_SERIAL;
@ -1417,7 +1417,7 @@ static int __init capi_init(void)
return PTR_ERR(capi_class);
}
device_create(capi_class, NULL, MKDEV(capi_major, 0), NULL, "capi");
device_create(capi_class, NULL, MKDEV(capi_major, 0), NULL, "capi20");
if (capinc_tty_init() < 0) {
device_destroy(capi_class, MKDEV(capi_major, 0));