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Can anyone give me a convenient command to find out where a USB device is mounted to? In this case it is a webcam I need to find out about. ...
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  1. #1
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    Jun 2003
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    usb device mount points


    Can anyone give me a convenient command to find out where a USB device is mounted to? In this case it is a webcam I need to find out about. All the correct modules are loaded as far as I can see (pwc, videodev, even ov511...). The camera is a supported device, too; a Philips PCVC 740K, and is in /proc/bus/usb/devices

    Code:
    ajalli:/usr/X11R6/bin # cat /proc/bus/usb/devices
    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-alt Root Hub
    S:  SerialNumber=18c0
    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#=  3 Spd=12  MxCh= 0
    D:  Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs=  1
    P:  Vendor=0471 ProdID=0311 Rev= 0.03
    S:  SerialNumber=016800005D1B0101
    It is also live, as the red light on the camera itself is glowing brightly. However, xawtv does not seem to be able to see the device, at least not in the place it is expecting to see it, namely /dev/video, which is linked to /dev/video0:

    Code:
    geoff@ajalli:/opt/mozilla/plugins> xawtv
    This is xawtv-3.61, running on Linux/i686 (2.4.10-4GB)
    can't open /dev/video0: No such device
    v4l-conf had some trouble, trying to continue anyway
    v4l2: open /dev/video0: No such device
    v4l: open /dev/video0: No such device
    no video grabber device available
    This is also true if I use the -c dev/video# option.

    So I need to find out where the device is mounted to...

    Any ideas?

  2. #2
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    And also...

    I forgot the most important part...

    Code:
    Oct 26 15:04:57 ajalli kernel: pwc Philips PCA645/646 + PCVC675/680/690 + PCVC730/740/750 we
    bcam module version 8.2 loaded.
    Oct 26 15:04:57 ajalli kernel: pwc Also supports Askey VC010 cam.
    Oct 26 15:04:57 ajalli kernel: usb.c: registered new driver Philips webcam
    Oct 26 15:04:57 ajalli kernel: pwc Philips PCVC740K (ToUCam Pro) USB webcam detected.
    Oct 26 15:04:57 ajalli kernel: pwc Registered as /dev/video0.
    Permissions are set for the group video:
    crw-rw-rw- 1 root video 81, 0 Sep 24 2001 /dev/video0

    And the user starting the xawtv app. is a member of the video group...

  3. #3
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    Problem sorted...

    OK, the quicker and brighter amongst you will have seen that the permissions were not set correctly... I would still like to know if there is a command to see which USB devices are mounted and where - without having to trawl through /var/log/messages...

    Thanks

  4. #4
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