acm.rst 4.9 KB

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