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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
+
+ 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.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.