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diff --git a/Documentation/usb/acm.txt b/Documentation/usb/acm.txt
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+			  Linux ACM driver v0.16
+		 (c) 1999 Vojtech Pavlik <vojtech@suse.cz>
+			     Sponsored by SuSE
+----------------------------------------------------------------------------
+
+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 <vojtech@suse.cz>, 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/class/cdc-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
+
+  Some cell phones also connect via USB. I know the following phones work:
+
+	SonyEricsson K800i
+
+  Unfortunately many modems and most ISDN TAs use proprietary interfaces and
+thus won't work with this drivers. Check for ACM compliance before buying.
+
+  To use the modems you need these modules loaded:
+
+	usbcore.ko
+	uhci-hcd.ko ohci-hcd.ko or ehci-hcd.ko
+	cdc-acm.ko
+
+  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.