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    Annotation of /tags/udev-165-r1/udev-sound-card.rules.magellan

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    Revision 1238 - (hide annotations) (download)
    Thu Dec 16 17:40:15 2010 UTC (13 years, 4 months ago) by niro
    File size: 5345 byte(s) 
    tagged 'udev-165-r1'
    1 niro 884 # /etc/udev/rules/78-sound-card.rules: device naming rules for udev
    2 niro 1016 # $Header: /root/magellan-cvs/src/udev/udev-sound-card.rules.magellan,v 1.2 2010-04-06 23:46:22 niro Exp $
    3 niro 884 #
    4     # There are a number of modifiers that are allowed to be used in some
    5     # of the different fields. They provide the following subsitutions:
    6     # %n - the "kernel number" of the device.
    7     # For example, 'sda3' has a "kernel number" of '3'
    8     # %k - the kernel name for the device.
    9     # %M - the kernel major number for the device
    10     # %m - the kernel minor number for the device
    11     # %b - the bus id for the device
    12     # %c - the string returned by the PROGRAM. (Note, this doesn't work within
    13     # the PROGRAM field for the obvious reason.)
    14     # %s{filename} - the content of a sysfs attribute.
    15     # %% - the '%' char itself.
    16     #
    17     # Try not to modify this file, if you wish to change things, create a new rule
    18     # file that can be run before this one.
    19     #
    20    
    21     SUBSYSTEM!="sound", GOTO="sound_end"
    22    
    23     ACTION=="add|change", KERNEL=="controlC*", ATTR{../uevent}="change"
    24     ACTION!="change", GOTO="sound_end"
    25    
    26     # Ok, we probably need a little explanation here for what the two lines above
    27     # are good for.
    28     #
    29     # The story goes like this: when ALSA registers a new sound card it emits a
    30     # series of 'add' events to userspace, for the main card device and for all the
    31     # child device nodes that belong to it. udev relays those to applications,
    32     # however only maintains the order between father and child, but not between
    33     # the siblings. The control device node creation can be used as synchronization
    34     # point. All other devices that belong to a card are created in the kernel
    35     # before it. However unfortunately due to the fact that siblings are forwarded
    36     # out of order by udev this fact is lost to applications.
    37     #
    38     # OTOH before an application can open a device it needs to make sure that all
    39     # its device nodes are completely created and set up.
    40     #
    41     # As a workaround for this issue we have added the udev rule above which will
    42     # generate a 'change' event on the main card device from the 'add' event of the
    43     # card's control device. Due to the ordering semantics of udev this event will
    44     # only be relayed after all child devices have finished processing properly.
    45     # When an application needs to listen for appearing devices it can hence look
    46     # for 'change' events only, and ignore the actual 'add' events.
    47     #
    48     # When the application is initialized at the same time as a device is plugged
    49     # in it may need to figure out if the 'change' event has already been triggered
    50     # or not for a card. To find that out we store the flag environment variable
    51     # SOUND_INITIALIZED on the device which simply tells us if the card 'change'
    52     # event has already been processed.
    53    
    54     KERNEL!="card*", GOTO="sound_end"
    55    
    56     ENV{SOUND_INITIALIZED}="1"
    57    
    58     SUBSYSTEMS=="usb", ENV{ID_MODEL}=="", IMPORT{program}="usb_id --export %p"
    59     SUBSYSTEMS=="usb", ENV{ID_VENDOR_FROM_DATABASE}=="", IMPORT{program}="usb-db %p"
    60     SUBSYSTEMS=="usb", ATTRS{idVendor}!="", ATTRS{idProduct}!="", ENV{ID_VENDOR_ID}="$attr{idVendor}", ENV{ID_MODEL_ID}="$attr{idProduct}"
    61     SUBSYSTEMS=="usb", ATTRS{bInterfaceNumber}!="", ENV{ID_IFACE}="$attr{bInterfaceNumber}"
    62     SUBSYSTEMS=="usb", GOTO="skip_pci"
    63    
    64     SUBSYSTEMS=="pci", ENV{ID_VENDOR_FROM_DATABASE}=="", IMPORT{program}="pci-db %p"
    65     SUBSYSTEMS=="pci", ENV{ID_BUS}="pci", ENV{ID_VENDOR_ID}="$attr{vendor}", ENV{ID_MODEL_ID}="$attr{device}"
    66    
    67     LABEL="skip_pci"
    68    
    69 niro 1016 ENV{ID_SERIAL}=="?*", ENV{ID_IFACE}=="?*", ENV{ID_ID}="$env{ID_BUS}-$env{ID_SERIAL}-$env{ID_IFACE}-$attr{id}"
    70     ENV{ID_SERIAL}=="?*", ENV{ID_IFACE}=="", ENV{ID_ID}="$env{ID_BUS}-$env{ID_SERIAL}-$attr{id}"
    71 niro 884
    72 niro 1016 ENV{ID_PATH}=="", IMPORT{program}="path_id %p/controlC%n"
    73 niro 884
    74     # The values used here for $SOUND_FORM_FACTOR and $SOUND_CLASS should be kept
    75     # in sync with those defined for PulseAudio's src/pulse/proplist.h
    76     # PA_PROP_DEVICE_FORM_FACTOR, PA_PROP_DEVICE_CLASS properties.
    77    
    78     # If the first PCM device of this card has the pcm class 'modem', then the card is a modem
    79     ATTR{pcmC%nD0p/pcm_class}=="modem", ENV{SOUND_CLASS}="modem", GOTO="sound_end"
    80    
    81     # Identify cards on the internal PCI bus as internal
    82     SUBSYSTEMS=="pci", DEVPATH=="*/0000:00:??.?/sound/*", ENV{SOUND_FORM_FACTOR}="internal", GOTO="sound_end"
    83    
    84     # Devices that also support Image/Video interfaces are most likely webcams
    85     SUBSYSTEMS=="usb", ENV{ID_USB_INTERFACES}=="*:0e????:*", ENV{SOUND_FORM_FACTOR}="webcam", GOTO="sound_end"
    86    
    87     # Matching on the model strings is a bit ugly, I admit
    88     ENV{ID_MODEL}=="*[Ss]peaker*", ENV{SOUND_FORM_FACTOR}="speaker", GOTO="sound_end"
    89     ENV{ID_MODEL_FROM_DATABASE}=="*[Ss]peaker*", ENV{SOUND_FORM_FACTOR}="speaker", GOTO="sound_end"
    90    
    91     ENV{ID_MODEL}=="*[Hh]eadphone*", ENV{SOUND_FORM_FACTOR}="headphone", GOTO="sound_end"
    92     ENV{ID_MODEL_FROM_DATABASE}=="*[Hh]eadphone*", ENV{SOUND_FORM_FACTOR}="headphone", GOTO="sound_end"
    93    
    94     ENV{ID_MODEL}=="*[Hh]eadset*", ENV{SOUND_FORM_FACTOR}="headset", GOTO="sound_end"
    95     ENV{ID_MODEL_FROM_DATABASE}=="*[Hh]eadset*", ENV{SOUND_FORM_FACTOR}="headset", GOTO="sound_end"
    96    
    97     ENV{ID_MODEL}=="*[Hh]andset*", ENV{SOUND_FORM_FACTOR}="handset", GOTO="sound_end"
    98     ENV{ID_MODEL_FROM_DATABASE}=="*[Hh]andset*", ENV{SOUND_FORM_FACTOR}="handset", GOTO="sound_end"
    99    
    100     ENV{ID_MODEL}=="*[Mm]icrophone*", ENV{SOUND_FORM_FACTOR}="microphone", GOTO="sound_end"
    101     ENV{ID_MODEL_FROM_DATABASE}=="*[Mm]icrophone*", ENV{SOUND_FORM_FACTOR}="microphone", GOTO="sound_end"
    102    
    103     LABEL="sound_end"