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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  14  <h1>
  15      <a href="http://people.skolelinux.org/pere/blog/">Petter Reinholdtsen</a>
  16
  17  </h1>
  18
  19 </div>
  20
  21
  22     <div class="entry">
  23       <div class="title">Which module is loaded for a given PCI and USB device?</div>
  24       <div class="date">23rd January 2011</div>
  25       <div class="body"><p>In the
  26 <a href="http://packages.qa.debian.org/discover-data">discover-data</a>
  27 package in Debian, there is a script to report useful information
  28 about the running hardware for use when people report missing
  29 information.  One part of this script that I find very useful when
  30 debugging hardware problems, is the part mapping loaded kernel module
  31 to the PCI device it claims.  It allow me to quickly see if the kernel
  32 module I expect is driving the hardware I am struggling with.  To see
  33 the output, make sure discover-data is installed and run
  34 <tt>/usr/share/bug/discover-data 3>&1</tt>.  The relevant output on
  35 one of my machines like this:</p>
  36
  37 <pre>
  38 loaded modules:
  39 10de:03eb i2c_nforce2
  40 10de:03f1 ohci_hcd
  41 10de:03f2 ehci_hcd
  42 10de:03f0 snd_hda_intel
  43 10de:03ec pata_amd
  44 10de:03f6 sata_nv
  45 1022:1103 k8temp
  46 109e:036e bttv
  47 109e:0878 snd_bt87x
  48 11ab:4364 sky2
  49 </pre>
  50
  51 <p>The code in question look like this, slightly modified for
  52 readability and to drop the output to file descriptor 3:</p>
  53
  54 <pre>
  55 if [ -d /sys/bus/pci/devices/ ] ; then
  56     echo loaded pci modules:
  57     (
  58         cd /sys/bus/pci/devices/
  59         for address in * ; do
  60             if [ -d "$address/driver/module" ] ; then
  61                 module=`cd $address/driver/module ; pwd -P | xargs basename`
  62                 if grep -q "^$module " /proc/modules ; then
  63                     address=$(echo $address |sed s/0000://)
  64                     id=`lspci -n -s $address | tail -n 1 | awk '{print $3}'`
  65                     echo "$id $module"
  66                 fi
  67             fi
  68         done
  69     )
  70     echo
  71 fi
  72 </pre>
  73
  74 <p>Similar code could be used to extract USB device module
  75 mappings:</p>
  76
  77 <pre>
  78 if [ -d /sys/bus/usb/devices/ ] ; then
  79     echo loaded usb modules:
  80     (
  81         cd /sys/bus/usb/devices/
  82         for address in * ; do
  83             if [ -d "$address/driver/module" ] ; then
  84                 module=`cd $address/driver/module ; pwd -P | xargs basename`
  85                 if grep -q "^$module " /proc/modules ; then
  86                     address=$(echo $address |sed s/0000://)
  87                     id=$(lsusb -s $address | tail -n 1 | awk '{print $6}')
  88                     if [ "$id" ] ; then
  89                         echo "$id $module"
  90                     fi
  91                 fi
  92             fi
  93         done
  94     )
  95     echo
  96 fi
  97 </pre>
  98
  99 <p>This might perhaps be something to include in other tools as
 100 well.</p>
 101 </div>
 102
 103       <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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