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37edb704f9
We don't care about the ordering, so we may just as well drop the numerical prefixes that we normally use for sorting. Also rename some other samples to keep width of output down to reasonable width.
97 lines
4.7 KiB
Plaintext
97 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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IMPORT{builtin}="hwdb"
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SUBSYSTEMS=="usb", IMPORT{builtin}="usb_id"
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SUBSYSTEMS=="usb", GOTO="skip_pci"
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SUBSYSTEMS=="firewire", ATTRS{guid}=="?*", \
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ENV{ID_BUS}="firewire", ENV{ID_SERIAL}="$attr{guid}", ENV{ID_SERIAL_SHORT}="$attr{guid}", \
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ENV{ID_VENDOR_ID}="$attr{vendor}", ENV{ID_MODEL_ID}="$attr{model}", \
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ENV{ID_VENDOR}="$attr{vendor_name}", ENV{ID_MODEL}="$attr{model_name}"
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SUBSYSTEMS=="firewire", GOTO="skip_pci"
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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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SUBSYSTEMS=="pci", GOTO="skip_pci"
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# If we reach here, the device nor any of its parents are USB/PCI/firewire bus devices.
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# If we now find a parent that is a platform device, assume that we're working with
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# an internal sound card.
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SUBSYSTEMS=="platform", ENV{SOUND_FORM_FACTOR}="internal", GOTO="sound_end"
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LABEL="skip_pci"
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# Define ID_ID if ID_BUS and ID_SERIAL are set. This will work for both
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# USB and firewire.
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ENV{ID_SERIAL}=="?*", ENV{ID_USB_INTERFACE_NUM}=="?*", ENV{ID_ID}="$env{ID_BUS}-$env{ID_SERIAL}-$env{ID_USB_INTERFACE_NUM}"
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ENV{ID_SERIAL}=="?*", ENV{ID_USB_INTERFACE_NUM}=="", ENV{ID_ID}="$env{ID_BUS}-$env{ID_SERIAL}"
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IMPORT{builtin}="path_id"
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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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# 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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