# do not edit this file, it will be overwritten on update

SUBSYSTEM!="sound", GOTO="sound_end"

ACTION=="add|change", KERNEL=="controlC*", ATTR{../uevent}="change"

ACTION!="change", GOTO="sound_end"

# Ok, we probably need a little explanation here for what the two lines above

# are good for.

#

# The story goes like this: when ALSA registers a new sound card it emits a

# series of 'add' events to userspace, for the main card device and for all the

# child device nodes that belong to it. udev relays those to applications,

# however only maintains the order between father and child, but not between

# the siblings. The control device node creation can be used as synchronization

# point. All other devices that belong to a card are created in the kernel

# before it. However unfortunately due to the fact that siblings are forwarded

# out of order by udev this fact is lost to applications.

#

# OTOH before an application can open a device it needs to make sure that all

# its device nodes are completely created and set up.

#

# As a workaround for this issue we have added the udev rule above which will

# generate a 'change' event on the main card device from the 'add' event of the

# card's control device. Due to the ordering semantics of udev this event will

# only be relayed after all child devices have finished processing properly.

# When an application needs to listen for appearing devices it can hence look

# for 'change' events only, and ignore the actual 'add' events.

#

# When the application is initialized at the same time as a device is plugged

# in it may need to figure out if the 'change' event has already been triggered

# or not for a card. To find that out we store the flag environment variable

# SOUND_INITIALIZED on the device which simply tells us if the card 'change'

# event has already been processed.

KERNEL!="card*", GOTO="sound_end"

ENV{SOUND_INITIALIZED}="1"

SUBSYSTEMS=="usb", IMPORT{builtin}="usb_id"

SUBSYSTEMS=="usb", IMPORT{builtin}="usb-db"

SUBSYSTEMS=="usb", GOTO="skip_pci"

SUBSYSTEMS=="firewire", ATTRS{vendor_name}=="?*", ATTRS{model_name}=="?*", \

ENV{ID_BUS}="firewire", ENV{ID_VENDOR}="$attr{vendor_name}", ENV{ID_MODEL}="$attr{model_name}"

SUBSYSTEMS=="firewire", ATTRS{guid}=="?*", ENV{ID_ID}="firewire-$attr{guid}"

SUBSYSTEMS=="firewire", GOTO="skip_pci"

SUBSYSTEMS=="pci", IMPORT{builtin}="pci-db"

SUBSYSTEMS=="pci", ENV{ID_BUS}="pci", ENV{ID_VENDOR_ID}="$attr{vendor}", ENV{ID_MODEL_ID}="$attr{device}"

LABEL="skip_pci"

ENV{ID_SERIAL}=="?*", ENV{ID_USB_INTERFACE_NUM}=="?*", ENV{ID_ID}="$env{ID_BUS}-$env{ID_SERIAL}-$env{ID_USB_INTERFACE_NUM}-$attr{id}"

ENV{ID_SERIAL}=="?*", ENV{ID_USB_INTERFACE_NUM}=="", ENV{ID_ID}="$env{ID_BUS}-$env{ID_SERIAL}-$attr{id}"

IMPORT{builtin}="path_id"

# The values used here for $SOUND_FORM_FACTOR and $SOUND_CLASS should be kept

# in sync with those defined for PulseAudio's src/pulse/proplist.h

# PA_PROP_DEVICE_FORM_FACTOR, PA_PROP_DEVICE_CLASS properties.

# If the first PCM device of this card has the pcm class 'modem', then the card is a modem

ATTR{pcmC%nD0p/pcm_class}=="modem", ENV{SOUND_CLASS}="modem", GOTO="sound_end"

# Identify cards on the internal PCI bus as internal

SUBSYSTEMS=="pci", DEVPATH=="*/0000:00:??.?/sound/*", ENV{SOUND_FORM_FACTOR}="internal", GOTO="sound_end"

# Devices that also support Image/Video interfaces are most likely webcams

SUBSYSTEMS=="usb", ENV{ID_USB_INTERFACES}=="*:0e????:*", ENV{SOUND_FORM_FACTOR}="webcam", GOTO="sound_end"

# Matching on the model strings is a bit ugly, I admit

ENV{ID_MODEL}=="*[Ss]peaker*", ENV{SOUND_FORM_FACTOR}="speaker", GOTO="sound_end"

ENV{ID_MODEL_FROM_DATABASE}=="*[Ss]peaker*", ENV{SOUND_FORM_FACTOR}="speaker", GOTO="sound_end"

ENV{ID_MODEL}=="*[Hh]eadphone*", ENV{SOUND_FORM_FACTOR}="headphone", GOTO="sound_end"

ENV{ID_MODEL_FROM_DATABASE}=="*[Hh]eadphone*", ENV{SOUND_FORM_FACTOR}="headphone", GOTO="sound_end"

ENV{ID_MODEL}=="*[Hh]eadset*", ENV{SOUND_FORM_FACTOR}="headset", GOTO="sound_end"

ENV{ID_MODEL_FROM_DATABASE}=="*[Hh]eadset*", ENV{SOUND_FORM_FACTOR}="headset", GOTO="sound_end"

ENV{ID_MODEL}=="*[Hh]andset*", ENV{SOUND_FORM_FACTOR}="handset", GOTO="sound_end"

ENV{ID_MODEL_FROM_DATABASE}=="*[Hh]andset*", ENV{SOUND_FORM_FACTOR}="handset", GOTO="sound_end"

ENV{ID_MODEL}=="*[Mm]icrophone*", ENV{SOUND_FORM_FACTOR}="microphone", GOTO="sound_end"

ENV{ID_MODEL_FROM_DATABASE}=="*[Mm]icrophone*", ENV{SOUND_FORM_FACTOR}="microphone", GOTO="sound_end"

LABEL="sound_end"