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92 lines
4.7 KiB
Plaintext
92 lines
4.7 KiB
Plaintext
# do not edit this file, it will be overwritten on update
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SUBSYSTEM!="sound", GOTO="sound_end"
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ACTION=="add|change", KERNEL=="controlC*", ATTR{../uevent}="change"
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ACTION!="change", GOTO="sound_end"
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# Ok, we probably need a little explanation here for what the two lines above
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# are good for.
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#
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# The story goes like this: when ALSA registers a new sound card it emits a
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# series of 'add' events to userspace, for the main card device and for all the
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# child device nodes that belong to it. udev relays those to applications,
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# however only maintains the order between father and child, but not between
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# the siblings. The control device node creation can be used as synchronization
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# point. All other devices that belong to a card are created in the kernel
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# before it. However unfortunately due to the fact that siblings are forwarded
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# out of order by udev this fact is lost to applications.
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#
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# OTOH before an application can open a device it needs to make sure that all
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# its device nodes are completely created and set up.
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#
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# As a workaround for this issue we have added the udev rule above which will
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# generate a 'change' event on the main card device from the 'add' event of the
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# card's control device. Due to the ordering semantics of udev this event will
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# only be relayed after all child devices have finished processing properly.
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# When an application needs to listen for appearing devices it can hence look
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# for 'change' events only, and ignore the actual 'add' events.
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#
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# When the application is initialized at the same time as a device is plugged
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# in it may need to figure out if the 'change' event has already been triggered
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# or not for a card. To find that out we store the flag environment variable
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# SOUND_INITIALIZED on the device which simply tells us if the card 'change'
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# event has already been processed.
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KERNEL!="card*", GOTO="sound_end"
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ENV{SOUND_INITIALIZED}="1"
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SUBSYSTEMS=="usb", ENV{ID_MODEL}=="", IMPORT{program}="usb_id --export %p"
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SUBSYSTEMS=="usb", ENV{ID_VENDOR_FROM_DATABASE}=="", IMPORT{program}="usb-db %p"
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SUBSYSTEMS=="usb", ATTRS{idVendor}!="", ATTRS{idProduct}!="", ENV{ID_VENDOR_ID}="$attr{idVendor}", ENV{ID_MODEL_ID}="$attr{idProduct}"
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SUBSYSTEMS=="usb", ATTRS{bInterfaceNumber}!="", ENV{ID_IFACE}="$attr{bInterfaceNumber}"
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SUBSYSTEMS=="usb", GOTO="skip_pci"
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SUBSYSTEMS=="pci", ENV{ID_VENDOR_FROM_DATABASE}=="", IMPORT{program}="pci-db %p"
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SUBSYSTEMS=="pci", ENV{ID_BUS}="pci", ENV{ID_VENDOR_ID}="$attr{vendor}", ENV{ID_MODEL_ID}="$attr{device}"
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LABEL="skip_pci"
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ENV{ID_SERIAL}=="?*", ENV{ID_IFACE}=="?*", ENV{ID_ID}="$env{ID_BUS}-$env{ID_SERIAL}-$env{ID_IFACE}"
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ENV{ID_SERIAL}=="?*", ENV{ID_IFACE}=="", ENV{ID_ID}="$env{ID_BUS}-$env{ID_SERIAL}"
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ENV{ID_PATH}=="", IMPORT{program}="/usr/bin/env -i /lib/udev/path_id %p/controlC%n"
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# The values used here for $SOUND_FORM_FACTOR and $SOUND_CLASS should be kept
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# in sync with those defined for PulseAudio's src/pulse/proplist.h
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# PA_PROP_DEVICE_FORM_FACTOR, PA_PROP_DEVICE_CLASS properties.
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# If the first PCM device of this card has the pcm class 'modem', then the card is a modem
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ATTR{pcmC%nD0p/pcm_class}=="modem", ENV{SOUND_CLASS}="modem", GOTO="sound_end"
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# Identify cards on the internal PCI bus as internal
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SUBSYSTEMS=="pci", DEVPATH=="*/0000:00:??.?/sound/*", ENV{SOUND_FORM_FACTOR}="internal", GOTO="sound_end"
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# Recognize good old WinTV cards as TV cards
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SUBSYSTEMS=="pci", DRIVERS=="Bt87x", ENV{SOUND_FORM_FACTOR}="tv", GOTO="sound_end"
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# Hmm, do we really want this database here?
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SUBSYSTEMS=="usb", ATTRS{idVendor}=="0471", ATTRS{idProduct}=="0311", ENV{SOUND_FORM_FACTOR}="webcam", GOTO="sound_end"
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# Devices that also support Image/Video interfaces are most likely webcams
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SUBSYSTEMS=="usb", ENV{ID_USB_INTERFACES}=="*:0e????:*", ENV{SOUND_FORM_FACTOR}="webcam", GOTO="sound_end"
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# Matching on the model strings is a bit ugly, I admit
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ENV{ID_MODEL}=="*[Ss]peaker*", ENV{SOUND_FORM_FACTOR}="speaker", GOTO="sound_end"
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ENV{ID_MODEL_FROM_DATABASE}=="*[Ss]peaker*", ENV{SOUND_FORM_FACTOR}="speaker", GOTO="sound_end"
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ENV{ID_MODEL}=="*[Hh]eadphone*", ENV{SOUND_FORM_FACTOR}="headphone", GOTO="sound_end"
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ENV{ID_MODEL_FROM_DATABASE}=="*[Hh]eadphone*", ENV{SOUND_FORM_FACTOR}="headphone", GOTO="sound_end"
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ENV{ID_MODEL}=="*[Hh]eadset*", ENV{SOUND_FORM_FACTOR}="headset", GOTO="sound_end"
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ENV{ID_MODEL_FROM_DATABASE}=="*[Hh]eadset*", ENV{SOUND_FORM_FACTOR}="headset", GOTO="sound_end"
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ENV{ID_MODEL}=="*[Hh]andset*", ENV{SOUND_FORM_FACTOR}="handset", GOTO="sound_end"
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ENV{ID_MODEL_FROM_DATABASE}=="*[Hh]andset*", ENV{SOUND_FORM_FACTOR}="handset", GOTO="sound_end"
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ENV{ID_MODEL}=="*[Mm]icrophone*", ENV{SOUND_FORM_FACTOR}="microphone", GOTO="sound_end"
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ENV{ID_MODEL_FROM_DATABASE}=="*[Mm]icrophone*", ENV{SOUND_FORM_FACTOR}="microphone", GOTO="sound_end"
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LABEL="sound_end"
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