Hysdn Driver

The hysdn driver has been written by Werner Cornelius (werner@isdn4linux.de or werner@titro.de) for Hypercope GmbH Aachen Germany. Hypercope agreed to publish this driver under the GNU General Public License.

The CAPI 2.0-support was added by Ulrich Albrecht (ualbrecht@hypercope.de) for Hypercope GmbH Aachen, Germany.

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

1. About the driver

The drivers/isdn/hysdn subdir contains a driver for HYPERCOPEs active PCI isdn cards Champ, Ergo and Metro. To enable support for this cards enable ISDN support in the kernel config and support for HYSDN cards in the active cards submenu. The driver may only be compiled and used if support for loadable modules and the process filesystem have been enabled.

These cards provide two different interfaces to the kernel. Without the optional CAPI 2.0 support, they register as ethernet card. IP-routing to a ISDN-destination is performed on the card itself. All necessary handlers for various protocols like ppp and others as well as config info and firmware may be fetched from Hypercopes WWW-Site www.hypercope.de.

With CAPI 2.0 support enabled, the card can also be used as a CAPI 2.0 compliant devices with either CAPI 2.0 applications (check isdn4k-utils) or -using the capidrv module- as a regular isdn4linux device. This is done via the same mechanism as with the active AVM cards and in fact uses the same module.

2. Loading/Unloading the driver

The module has no command line parameters and auto detects up to 10 cards in the id-range 0-9. If a loaded driver shall be unloaded all open files in the /proc/net/hysdn subdir need to be closed and all ethernet interfaces allocated by this driver must be shut down. Otherwise the module counter will avoid a module unload.

If you are using the CAPI 2.0-interface, make sure to load/modprobe the kernelcapi-module first.

If you plan to use the capidrv-link to isdn4linux, make sure to load capidrv.o after all modules using this driver (i.e. after hysdn and any avm-specific modules).

3. Entries in the /proc filesystem

When the module has been loaded it adds the directory hysdn in the /proc/net tree. This directory contains exactly 2 file entries for each card. One is called cardconfX and the other cardlogX, where X is the card id number from 0 to 9. The cards are numbered in the order found in the PCI config data.

4. The /proc/net/hysdn/cardconfX file

This file may be read to get by everyone to get info about the cards type, actual state, available features and used resources. The first 3 entries (id, bus and slot) are PCI info fields, the following type field gives the information about the cards type:

  • 4 -> Ergo card (server card with 2 b-chans)

  • 5 -> Metro card (server card with 4 or 8 b-chans)

  • 6 -> Champ card (client card with 2 b-chans)

The following 3 fields show the hardware assignments for irq, iobase and the dual ported memory (dp-mem).

The fields b-chans and fax-chans announce the available card resources of this types for the user.

The state variable indicates the actual drivers state for this card with the following assignments.

  • 0 -> card has not been booted since driver load

  • 1 -> card booting is actually in progess

  • 2 -> card is in an error state due to a previous boot failure

  • 3 -> card is booted and active

And the last field (device) shows the name of the ethernet device assigned to this card. Up to the first successful boot this field only shows a - to tell that no net device has been allocated up to now. Once a net device has been allocated it remains assigned to this card, even if a card is rebooted and an boot error occurs.

Writing to the cardconfX file boots the card or transfers config lines to the cards firmware. The type of data is automatically detected when the first data is written. Only root has write access to this file. The firmware boot files are normally called hyclient.pof for client cards and hyserver.pof for server cards. After successfully writing the boot file, complete config files or single config lines may be copied to this file. If an error occurs the return value given to the writing process has the following additional codes (decimal):


Another process is currently bootng the card


Invalid firmware header


Boards dual-port RAM test failed


Internal firmware handler error


Boot image size invalid


First boot stage (bootstrap loader) failed


Second boot stage failure


Timeout waiting for card ready during boot


Operation only allowed in booted state


Config line too long


Invalid channel number


Timeout sending config data

Additional info about error reasons may be fetched from the log output.

5. The /proc/net/hysdn/cardlogX file

The cardlogX file entry may be opened multiple for reading by everyone to get the cards and drivers log data. Card messages always start with the keyword LOG. All other lines are output from the driver. The driver log data may be redirected to the syslog by selecting the appropriate bitmask. The cards log messages will always be send to this interface but never to the syslog.

A root user may write a decimal or hex (with 0x) value t this file to select desired output options. As mentioned above the cards log dat is always written to the cardlog file independent of the following options only used to check and debug the driver itself:

For example:

echo "0x34560078" > /proc/net/hysdn/cardlog0

to output the hex log mask 34560078 for card 0.

The written value is regarded as an unsigned 32-Bit value, bit ored for desired output. The following bits are already assigned:


All driver log data is alternatively via syslog


Log memory allocation errors


Firmware load start and close are logged


Log firmware record parser


Log every firmware write actions


Log all card related boot messages


Output all config data sent for debugging purposes


Only non comment config lines are shown wth channel


Additional conf log output


Log the asynchronous scheduler actions (config and log)


Log all open and close actions to /proc/net/hysdn/card files


Log all actions from /proc file entries


Log network interface init and deinit

6. Where to get additional info and help

If you have any problems concerning the driver or configuration contact the Hypercope support team (support@hypercope.de) and or the authors Werner Cornelius (werner@isdn4linux or cornelius@titro.de) or Ulrich Albrecht (ualbrecht@hypercope.de).