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                          Linux ACM driver v0.16

                 (c) 1999 Vojtech Pavlik 

                             Sponsored by SuSE

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0. Disclaimer

~~~~~~~~~~~~~

  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., 59

Temple Place, Suite 330, Boston, MA 02111-1307 USA

  Should you need to contact me, the author, you can do so either by e-mail

- mail your message to , or by paper mail: Vojtech Pavlik,

Ucitelska 1576, Prague 8, 182 00 Czech Republic

  For your convenience, the GNU General Public License version 2 is included

in the package: See the file COPYING.

1. Usage

~~~~~~~~

  The drivers/usb/acm.c drivers works with USB modems and USB ISDN terminal

adapters that conform to the Universal Serial Bus Communication Device Class

Abstract Control Model (USB CDC ACM) specification.

  Many modems do, here is a list of those I know of:

        3Com OfficeConnect 56k

        3Com Voice FaxModem Pro

        3Com Sportster

        MultiTech MultiModem 56k

        Zoom 2986L FaxModem

        Compaq 56k FaxModem

        ELSA Microlink 56k

  I know of one ISDN TA that does work with the acm driver:

        3Com USR ISDN Pro TA

  Unfortunately many modems and most ISDN TAs use proprietary interfaces and

thus won't work with this drivers. Check for ACM compliance before buying.

  The driver (with devfs) creates these devices in /dev/usb/acm:

        crw-r--r--   1 root     root     166,   0 Apr  1 10:49 0

        crw-r--r--   1 root     root     166,   1 Apr  1 10:49 1

        crw-r--r--   1 root     root     166,   2 Apr  1 10:49 2

  And so on, up to 31, with the limit being possible to change in acm.c to up

to 256, so you can use up to 256 USB modems with one computer (you'll need

three USB cards for that, though).

  If you don't use devfs, then you can create device nodes with the same

minor/major numbers anywhere you want, but either the above location or

/dev/usb/ttyACM0 is preferred.

  To use the modems you need these modules loaded:

        usbcore.o

        usb-[uo]hci.o or uhci.o

        acm.o

  After that, the modem[s] should be accessible. You should be able to use

minicom, ppp and mgetty with them.

2. Verifying that it works

~~~~~~~~~~~~~~~~~~~~~~~~~~

  The first step would be to check /proc/bus/usb/devices, it should look

like this:

T:  Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#=  1 Spd=12  MxCh= 2

B:  Alloc=  0/900 us ( 0%), #Int=  0, #Iso=  0

D:  Ver= 1.00 Cls=09(hub  ) Sub=00 Prot=00 MxPS= 8 #Cfgs=  1

P:  Vendor=0000 ProdID=0000 Rev= 0.00

S:  Product=USB UHCI Root Hub

S:  SerialNumber=6800

C:* #Ifs= 1 Cfg#= 1 Atr=40 MxPwr=  0mA

I:  If#= 0 Alt= 0 #EPs= 1 Cls=09(hub  ) Sub=00 Prot=00 Driver=hub

E:  Ad=81(I) Atr=03(Int.) MxPS=   8 Ivl=255ms

T:  Bus=01 Lev=01 Prnt=01 Port=01 Cnt=01 Dev#=  2 Spd=12  MxCh= 0

D:  Ver= 1.00 Cls=02(comm.) Sub=00 Prot=00 MxPS= 8 #Cfgs=  2

P:  Vendor=04c1 ProdID=008f Rev= 2.07

S:  Manufacturer=3Com Inc.

S:  Product=3Com U.S. Robotics Pro ISDN TA

S:  SerialNumber=UFT53A49BVT7

C:  #Ifs= 1 Cfg#= 1 Atr=60 MxPwr=  0mA

I:  If#= 0 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=ff Prot=ff Driver=acm

E:  Ad=85(I) Atr=02(Bulk) MxPS=  64 Ivl=  0ms

E:  Ad=04(O) Atr=02(Bulk) MxPS=  64 Ivl=  0ms

E:  Ad=81(I) Atr=03(Int.) MxPS=  16 Ivl=128ms

C:* #Ifs= 2 Cfg#= 2 Atr=60 MxPwr=  0mA

I:  If#= 0 Alt= 0 #EPs= 1 Cls=02(comm.) Sub=02 Prot=01 Driver=acm

E:  Ad=81(I) Atr=03(Int.) MxPS=  16 Ivl=128ms

I:  If#= 1 Alt= 0 #EPs= 2 Cls=0a(data ) Sub=00 Prot=00 Driver=acm

E:  Ad=85(I) Atr=02(Bulk) MxPS=  64 Ivl=  0ms

E:  Ad=04(O) Atr=02(Bulk) MxPS=  64 Ivl=  0ms

The presence of these three lines (and the Cls= 'comm' and 'data' classes)

is important, it means it's an ACM device. The Driver=acm means the acm

driver is used for the device. If you see only Cls=ff(vend.) then you're out

of luck, you have a device with vendor specific-interface.

D:  Ver= 1.00 Cls=02(comm.) Sub=00 Prot=00 MxPS= 8 #Cfgs=  2

I:  If#= 0 Alt= 0 #EPs= 1 Cls=02(comm.) Sub=02 Prot=01 Driver=acm

I:  If#= 1 Alt= 0 #EPs= 2 Cls=0a(data ) Sub=00 Prot=00 Driver=acm

In the system log you should see:

usb.c: USB new device connect, assigned device number 2

usb.c: kmalloc IF c7691fa0, numif 1

usb.c: kmalloc IF c7b5f3e0, numif 2

usb.c: skipped 4 class/vendor specific interface descriptors

usb.c: new device strings: Mfr=1, Product=2, SerialNumber=3

usb.c: USB device number 2 default language ID 0x409

Manufacturer: 3Com Inc.

Product: 3Com U.S. Robotics Pro ISDN TA

SerialNumber: UFT53A49BVT7

acm.c: probing config 1

acm.c: probing config 2

ttyACM0: USB ACM device

acm.c: acm_control_msg: rq: 0x22 val: 0x0 len: 0x0 result: 0

acm.c: acm_control_msg: rq: 0x20 val: 0x0 len: 0x7 result: 7

usb.c: acm driver claimed interface c7b5f3e0

usb.c: acm driver claimed interface c7b5f3f8

usb.c: acm driver claimed interface c7691fa0

If all this seems to be OK, fire up minicom and set it to talk to the ttyACM

device and try typing 'at'. If it responds with 'OK', then everything is

working.