Based on kernel version 4.16.1. Page generated on 2018-04-09 11:53 EST.
1 Linux ACM driver v0.16 2 (c) 1999 Vojtech Pavlik <vojtech@suse.cz> 3 Sponsored by SuSE 4 ---------------------------------------------------------------------------- 5 6 0. Disclaimer 7 ~~~~~~~~~~~~~ 8 This program is free software; you can redistribute it and/or modify it 9 under the terms of the GNU General Public License as published by the Free 10 Software Foundation; either version 2 of the License, or (at your option) 11 any later version. 12 13 This program is distributed in the hope that it will be useful, but 14 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 15 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 16 more details. 17 18 You should have received a copy of the GNU General Public License along 19 with this program; if not, write to the Free Software Foundation, Inc., 59 20 Temple Place, Suite 330, Boston, MA 02111-1307 USA 21 22 Should you need to contact me, the author, you can do so either by e-mail 23 - mail your message to <vojtech@suse.cz>, or by paper mail: Vojtech Pavlik, 24 Ucitelska 1576, Prague 8, 182 00 Czech Republic 25 26 For your convenience, the GNU General Public License version 2 is included 27 in the package: See the file COPYING. 28 29 1. Usage 30 ~~~~~~~~ 31 The drivers/usb/class/cdc-acm.c drivers works with USB modems and USB ISDN terminal 32 adapters that conform to the Universal Serial Bus Communication Device Class 33 Abstract Control Model (USB CDC ACM) specification. 34 35 Many modems do, here is a list of those I know of: 36 37 3Com OfficeConnect 56k 38 3Com Voice FaxModem Pro 39 3Com Sportster 40 MultiTech MultiModem 56k 41 Zoom 2986L FaxModem 42 Compaq 56k FaxModem 43 ELSA Microlink 56k 44 45 I know of one ISDN TA that does work with the acm driver: 46 47 3Com USR ISDN Pro TA 48 49 Some cell phones also connect via USB. I know the following phones work: 50 51 SonyEricsson K800i 52 53 Unfortunately many modems and most ISDN TAs use proprietary interfaces and 54 thus won't work with this drivers. Check for ACM compliance before buying. 55 56 To use the modems you need these modules loaded: 57 58 usbcore.ko 59 uhci-hcd.ko ohci-hcd.ko or ehci-hcd.ko 60 cdc-acm.ko 61 62 After that, the modem[s] should be accessible. You should be able to use 63 minicom, ppp and mgetty with them. 64 65 2. Verifying that it works 66 ~~~~~~~~~~~~~~~~~~~~~~~~~~ 67 The first step would be to check /sys/kernel/debug/usb/devices, it should look 68 like this: 69 70 T: Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=12 MxCh= 2 71 B: Alloc= 0/900 us ( 0%), #Int= 0, #Iso= 0 72 D: Ver= 1.00 Cls=09(hub ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1 73 P: Vendor=0000 ProdID=0000 Rev= 0.00 74 S: Product=USB UHCI Root Hub 75 S: SerialNumber=6800 76 C:* #Ifs= 1 Cfg#= 1 Atr=40 MxPwr= 0mA 77 I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub 78 E: Ad=81(I) Atr=03(Int.) MxPS= 8 Ivl=255ms 79 T: Bus=01 Lev=01 Prnt=01 Port=01 Cnt=01 Dev#= 2 Spd=12 MxCh= 0 80 D: Ver= 1.00 Cls=02(comm.) Sub=00 Prot=00 MxPS= 8 #Cfgs= 2 81 P: Vendor=04c1 ProdID=008f Rev= 2.07 82 S: Manufacturer=3Com Inc. 83 S: Product=3Com U.S. Robotics Pro ISDN TA 84 S: SerialNumber=UFT53A49BVT7 85 C: #Ifs= 1 Cfg#= 1 Atr=60 MxPwr= 0mA 86 I: If#= 0 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=ff Prot=ff Driver=acm 87 E: Ad=85(I) Atr=02(Bulk) MxPS= 64 Ivl= 0ms 88 E: Ad=04(O) Atr=02(Bulk) MxPS= 64 Ivl= 0ms 89 E: Ad=81(I) Atr=03(Int.) MxPS= 16 Ivl=128ms 90 C:* #Ifs= 2 Cfg#= 2 Atr=60 MxPwr= 0mA 91 I: If#= 0 Alt= 0 #EPs= 1 Cls=02(comm.) Sub=02 Prot=01 Driver=acm 92 E: Ad=81(I) Atr=03(Int.) MxPS= 16 Ivl=128ms 93 I: If#= 1 Alt= 0 #EPs= 2 Cls=0a(data ) Sub=00 Prot=00 Driver=acm 94 E: Ad=85(I) Atr=02(Bulk) MxPS= 64 Ivl= 0ms 95 E: Ad=04(O) Atr=02(Bulk) MxPS= 64 Ivl= 0ms 96 97 The presence of these three lines (and the Cls= 'comm' and 'data' classes) 98 is important, it means it's an ACM device. The Driver=acm means the acm 99 driver is used for the device. If you see only Cls=ff(vend.) then you're out 100 of luck, you have a device with vendor specific-interface. 101 102 D: Ver= 1.00 Cls=02(comm.) Sub=00 Prot=00 MxPS= 8 #Cfgs= 2 103 I: If#= 0 Alt= 0 #EPs= 1 Cls=02(comm.) Sub=02 Prot=01 Driver=acm 104 I: If#= 1 Alt= 0 #EPs= 2 Cls=0a(data ) Sub=00 Prot=00 Driver=acm 105 106 In the system log you should see: 107 108 usb.c: USB new device connect, assigned device number 2 109 usb.c: kmalloc IF c7691fa0, numif 1 110 usb.c: kmalloc IF c7b5f3e0, numif 2 111 usb.c: skipped 4 class/vendor specific interface descriptors 112 usb.c: new device strings: Mfr=1, Product=2, SerialNumber=3 113 usb.c: USB device number 2 default language ID 0x409 114 Manufacturer: 3Com Inc. 115 Product: 3Com U.S. Robotics Pro ISDN TA 116 SerialNumber: UFT53A49BVT7 117 acm.c: probing config 1 118 acm.c: probing config 2 119 ttyACM0: USB ACM device 120 acm.c: acm_control_msg: rq: 0x22 val: 0x0 len: 0x0 result: 0 121 acm.c: acm_control_msg: rq: 0x20 val: 0x0 len: 0x7 result: 7 122 usb.c: acm driver claimed interface c7b5f3e0 123 usb.c: acm driver claimed interface c7b5f3f8 124 usb.c: acm driver claimed interface c7691fa0 125 126 If all this seems to be OK, fire up minicom and set it to talk to the ttyACM 127 device and try typing 'at'. If it responds with 'OK', then everything is 128 working.