ACM linux 驱动验证

1、load ko  

  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.

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.