blog/Which_module_is_loaded_for_a_given_PCI_and_USB_device_.html

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   6     <title>Petter Reinholdtsen: Which module is loaded for a given PCI and USB device?</title>
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  12  <h1>
  13      <a href="http://people.skolelinux.org/pere/blog/">Petter Reinholdtsen</a>
  14
  15  </h1>
  16
  17 </div>
  18
  19
  20     <div class="entry">
  21       <div class="title">Which module is loaded for a given PCI and USB device?</div>
  22       <div class="date">23rd January 2011</div>
  23       <div class="body"><p>In the
  24 <a href="http://packages.qa.debian.org/discover-data">discover-data</a>
  25 package in Debian, there is a script to report useful information
  26 about the running hardware for use when people report missing
  27 information.  One part of this script that I find very useful when
  28 debugging hardware problems, is the part mapping loaded kernel module
  29 to the PCI device it claims.  It allow me to quickly see if the kernel
  30 module I expect is driving the hardware I am struggling with.  To see
  31 the output, make sure discover-data is installed and run
  32 <tt>/usr/share/bug/discover-data 3>&1</tt>.  The relevant output on
  33 one of my machines like this:</p>
  34
  35 <pre>
  36 loaded modules:
  37 10de:03eb i2c_nforce2
  38 10de:03f1 ohci_hcd
  39 10de:03f2 ehci_hcd
  40 10de:03f0 snd_hda_intel
  41 10de:03ec pata_amd
  42 10de:03f6 sata_nv
  43 1022:1103 k8temp
  44 109e:036e bttv
  45 109e:0878 snd_bt87x
  46 11ab:4364 sky2
  47 </pre>
  48
  49 <p>The code in question look like this, slightly modified for
  50 readability and to drop the output to file descriptor 3:</p>
  51
  52 <pre>
  53 if [ -d /sys/bus/pci/devices/ ] ; then
  54     echo loaded pci modules:
  55     (
  56         cd /sys/bus/pci/devices/
  57         for address in * ; do
  58             if [ -d "$address/driver/module" ] ; then
  59                 module=`cd $address/driver/module ; pwd -P | xargs basename`
  60                 if grep -q "^$module " /proc/modules ; then
  61                     address=$(echo $address |sed s/0000://)
  62                     id=`lspci -n -s $address | tail -n 1 | awk '{print $3}'`
  63                     echo "$id $module"
  64                 fi
  65             fi
  66         done
  67     )
  68     echo
  69 fi
  70 </pre>
  71
  72 <p>Similar code could be used to extract USB device module
  73 mappings:</p>
  74
  75 <pre>
  76 if [ -d /sys/bus/usb/devices/ ] ; then
  77     echo loaded usb modules:
  78     (
  79         cd /sys/bus/usb/devices/
  80         for address in * ; do
  81             if [ -d "$address/driver/module" ] ; then
  82                 module=`cd $address/driver/module ; pwd -P | xargs basename`
  83                 if grep -q "^$module " /proc/modules ; then
  84                     address=$(echo $address |sed s/0000://)
  85                     id=$(lsusb -s $address | tail -n 1 | awk '{print $6}')
  86                     if [ "$id" ] ; then
  87                         echo "$id $module"
  88                     fi
  89                 fi
  90             fi
  91         done
  92     )
  93     echo
  94 fi
  95 </pre>
  96
  97 <p>This might perhaps be something to include in other tools as
  98 well.</p>
  99 </div>
 100
 101       <div class="tags">Tags: <a href="http://people.skolelinux.org/pere/blog/tags/debian">debian</a>, <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>.</div>
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