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diff --git a/Documentation/usb/acm.rst b/Documentation/usb/acm.rst new file mode 100644 index 000000000..e8bda98e9 --- /dev/null +++ b/Documentation/usb/acm.rst @@ -0,0 +1,132 @@ +====================== +Linux ACM driver v0.16 +====================== + +Copyright (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 /sys/kernel/debug/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. |