Unfortunately there are no serial numbers, so my rules are based on the path given by the kernetl. Here's my current script:
#!/bin/bash
kernelStr=$1
devicePathStr=$2
# TEST DATA - PCM
# kernelStr="pcmC1D0pc"
# devicePathStr=/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1:1.0/sound/card1/pcmC1D0c
# TEST DATA - HW
# kernelStr="hwC1D0p"
# devicePathStr=/devices/pci0000:00/0000:00:1d.0/usb2/2-2/2-2:1.0/sound/card2/hwC2D0p
# TEST DATA - CONTROL
# kernelStr="controlC1D0p"
# devicePathStr=/devices/pci0000:00/0000:00:1d.0/usb2/2-2/2-2:1.0/sound/card2/controlC2D0p
# TEST DATA 2 - Unresolved
# kernelStr="pcmC1D0p"
# devicePathStr=/devices/pci0000:00/0000:00:1d.0/usb2/2-5/2-15:1.0/sound/card1/pcmC1D0c
# parse then 'kernel' string
if [ ${kernelStr:0:3} = "pcm" ] ; then
offset=3
fi
if [ ${kernelStr:0:2} = "hw" ] ; then
offset=2
fi
if [ ${kernelStr:0:7} = "control" ] ; then
offset=7
fi
if [ ${kernelStr:0:7} = "midi" ] ; then
offset=4
fi
cardType=${kernelStr:0:offset}
deviceNumber=${kernelStr:${#cardType}+3:1}
interfaceType=${kernelStr:${#cardType}+4:1}
# parse the device path string to retrieve the usb port from it
usbPortStringPosition=42
usbPortSpecifier=${devicePathStr:usbPortStringPosition:3}
# !!! you may have to update usbPortStringPosition to match the device path format on your machine. The easiest way to see the paths is to echo the value into a file, by uncommenting the following (then unplugging/plugging USB cards to trigger this script):
echo ${devicePathStr} >> ~/alsa_name.log
# find - and if applicable apply - mapping rules from USB port to card number
# !!! UPDATE THIS TO SUIT YOUR USB PORT NAMES AND REQUIRED CARD NUMBERS
if [ "$usbPortSpecifier" = "2-2" ] ; then
cardNumber="1"
elif [ "$usbPortSpecifier" = "2-1" ] ; then
cardNumber="2"
elif [ "$usbPortSpecifier" = "4-2" ] ; then
cardNumber="3"
fi
# debug statements
# echo - usb port specifier: ${usbPortSpecifier}
# echo - sound card type: ${cardType}
# echo - device number: ${deviceNumber}
# echo - interface: ${interfaceType}, where p = playback, c = capture
# apply the mapping if there is one
if [ $cardNumber != "" ] ; then
deviceName=${cardType}C${cardNumber}D${deviceNumber}${interfaceType}
logMessage="Mapped soundcard "$kernelStr" on USB port "${usbPortSpecifier}" to device name "${deviceName}" (card number "${cardNumber}")"
else
deviceName=${kernelStr}
logMessage="No custom mapping rule in alsa_name.sh applies to soundcard "$kernelStr" on USB port "${usbPortSpecifier}
fi
# echo $logMessage
echo $logMessage >> ~/alsa_name.log
# done
echo ${deviceName} # return to calling party, i.e. udev
exit 0
On Thu, 21 Jan 2010 01:12:58 am Jaroslav Kysela wrote:
> On Thu, 21 Jan 2010, Diego Tognola wrote:
>
> > Thanks Clemens,
> >
> > I tried /dev/snd as well but maybe my 'test' is invalid ?
> >
> > My expectations was that if I have rules for USB1-> card1, USB2->card2
> > and USB3->card3 setup, then reboot with the audio card on USB2
> > unplugged, then I should not see a card2 in /dev/snd or cat
> > /proc/asound/cards ? What I see, however, is a card1 and card2, no
> > card3.
>
> You should base your rules on USB serial numbers (hopefully the hardware
> vendor created unique serial numbers, otherwise you have no proper way to
> determine hw). You may also use the full hardware path (USB bus numbers
> and USB port numbers).
>
> Jaroslav
>
> -----
> Jaroslav Kysela <perex@xxxxxxxx>
> Linux Kernel Sound Maintainer
> ALSA Project, Red Hat, Inc.
>
>
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