1====================== 2Linux ACM driver v0.16 3====================== 4 5Copyright (c) 1999 Vojtech Pavlik <vojtech@suse.cz> 6 7Sponsored by SuSE 8 90. Disclaimer 10~~~~~~~~~~~~~ 11This program is free software; you can redistribute it and/or modify it 12under the terms of the GNU General Public License as published by the Free 13Software Foundation; either version 2 of the License, or (at your option) 14any later version. 15 16This program is distributed in the hope that it will be useful, but 17WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 18or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 19more details. 20 21You should have received a copy of the GNU General Public License along 22with this program; if not, write to the Free Software Foundation, Inc., 59 23Temple Place, Suite 330, Boston, MA 02111-1307 USA 24 25Should you need to contact me, the author, you can do so either by e-mail - 26mail your message to <vojtech@suse.cz>, or by paper mail: Vojtech Pavlik, 27Ucitelska 1576, Prague 8, 182 00 Czech Republic 28 29For your convenience, the GNU General Public License version 2 is included 30in the package: See the file COPYING. 31 321. Usage 33~~~~~~~~ 34The drivers/usb/class/cdc-acm.c drivers works with USB modems and USB ISDN terminal 35adapters that conform to the Universal Serial Bus Communication Device Class 36Abstract Control Model (USB CDC ACM) specification. 37 38Many modems do, here is a list of those I know of: 39 40 - 3Com OfficeConnect 56k 41 - 3Com Voice FaxModem Pro 42 - 3Com Sportster 43 - MultiTech MultiModem 56k 44 - Zoom 2986L FaxModem 45 - Compaq 56k FaxModem 46 - ELSA Microlink 56k 47 48I know of one ISDN TA that does work with the acm driver: 49 50 - 3Com USR ISDN Pro TA 51 52Some cell phones also connect via USB. I know the following phones work: 53 54 - SonyEricsson K800i 55 56Unfortunately many modems and most ISDN TAs use proprietary interfaces and 57thus won't work with this drivers. Check for ACM compliance before buying. 58 59To use the modems you need these modules loaded:: 60 61 usbcore.ko 62 uhci-hcd.ko ohci-hcd.ko or ehci-hcd.ko 63 cdc-acm.ko 64 65After that, the modem[s] should be accessible. You should be able to use 66minicom, ppp and mgetty with them. 67 682. Verifying that it works 69~~~~~~~~~~~~~~~~~~~~~~~~~~ 70 71The first step would be to check /sys/kernel/debug/usb/devices, it should look 72like this:: 73 74 T: Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=12 MxCh= 2 75 B: Alloc= 0/900 us ( 0%), #Int= 0, #Iso= 0 76 D: Ver= 1.00 Cls=09(hub ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1 77 P: Vendor=0000 ProdID=0000 Rev= 0.00 78 S: Product=USB UHCI Root Hub 79 S: SerialNumber=6800 80 C:* #Ifs= 1 Cfg#= 1 Atr=40 MxPwr= 0mA 81 I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub 82 E: Ad=81(I) Atr=03(Int.) MxPS= 8 Ivl=255ms 83 T: Bus=01 Lev=01 Prnt=01 Port=01 Cnt=01 Dev#= 2 Spd=12 MxCh= 0 84 D: Ver= 1.00 Cls=02(comm.) Sub=00 Prot=00 MxPS= 8 #Cfgs= 2 85 P: Vendor=04c1 ProdID=008f Rev= 2.07 86 S: Manufacturer=3Com Inc. 87 S: Product=3Com U.S. Robotics Pro ISDN TA 88 S: SerialNumber=UFT53A49BVT7 89 C: #Ifs= 1 Cfg#= 1 Atr=60 MxPwr= 0mA 90 I: If#= 0 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=ff Prot=ff Driver=acm 91 E: Ad=85(I) Atr=02(Bulk) MxPS= 64 Ivl= 0ms 92 E: Ad=04(O) Atr=02(Bulk) MxPS= 64 Ivl= 0ms 93 E: Ad=81(I) Atr=03(Int.) MxPS= 16 Ivl=128ms 94 C:* #Ifs= 2 Cfg#= 2 Atr=60 MxPwr= 0mA 95 I: If#= 0 Alt= 0 #EPs= 1 Cls=02(comm.) Sub=02 Prot=01 Driver=acm 96 E: Ad=81(I) Atr=03(Int.) MxPS= 16 Ivl=128ms 97 I: If#= 1 Alt= 0 #EPs= 2 Cls=0a(data ) Sub=00 Prot=00 Driver=acm 98 E: Ad=85(I) Atr=02(Bulk) MxPS= 64 Ivl= 0ms 99 E: Ad=04(O) Atr=02(Bulk) MxPS= 64 Ivl= 0ms 100 101The presence of these three lines (and the Cls= 'comm' and 'data' classes) 102is important, it means it's an ACM device. The Driver=acm means the acm 103driver is used for the device. If you see only Cls=ff(vend.) then you're out 104of luck, you have a device with vendor specific-interface:: 105 106 D: Ver= 1.00 Cls=02(comm.) Sub=00 Prot=00 MxPS= 8 #Cfgs= 2 107 I: If#= 0 Alt= 0 #EPs= 1 Cls=02(comm.) Sub=02 Prot=01 Driver=acm 108 I: If#= 1 Alt= 0 #EPs= 2 Cls=0a(data ) Sub=00 Prot=00 Driver=acm 109 110In the system log you should see:: 111 112 usb.c: USB new device connect, assigned device number 2 113 usb.c: kmalloc IF c7691fa0, numif 1 114 usb.c: kmalloc IF c7b5f3e0, numif 2 115 usb.c: skipped 4 class/vendor specific interface descriptors 116 usb.c: new device strings: Mfr=1, Product=2, SerialNumber=3 117 usb.c: USB device number 2 default language ID 0x409 118 Manufacturer: 3Com Inc. 119 Product: 3Com U.S. Robotics Pro ISDN TA 120 SerialNumber: UFT53A49BVT7 121 acm.c: probing config 1 122 acm.c: probing config 2 123 ttyACM0: USB ACM device 124 acm.c: acm_control_msg: rq: 0x22 val: 0x0 len: 0x0 result: 0 125 acm.c: acm_control_msg: rq: 0x20 val: 0x0 len: 0x7 result: 7 126 usb.c: acm driver claimed interface c7b5f3e0 127 usb.c: acm driver claimed interface c7b5f3f8 128 usb.c: acm driver claimed interface c7691fa0 129 130If all this seems to be OK, fire up minicom and set it to talk to the ttyACM 131device and try typing 'at'. If it responds with 'OK', then everything is 132working. 133