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    ALSA: hda - Add widget sysfs tree · 3256be65
    Takashi Iwai 提交于
    This patch changes the sysfs files assigned to the codec device on the
    bus which were formerly identical with hwdep sysfs files.  Now it
    shows only a few core parameter, vendor_id, subsystem_id, revision_id,
    afg, mfg, vendor_name and chip_name.
    
    In addition, now a widget tree is added to the bus device sysfs
    directory for showing the widget topology and attributes.  It's just a
    flat tree consisting of subdirectories named as the widget NID
    including various attributes like widget capability bits.  The AFG
    (usually NID 0x01) is always found there, and it contains always
    amp_in_caps, amp_out_caps and power_caps files.  Each of these
    attributes show a single value.  The rest are the widget nodes
    belonging to that AFG.  Note that the child node might not start from
    0x02 but from another value like 0x0a.
    
    Each child node may contain caps, pin_caps, amp_in_caps, amp_out_caps,
    power_caps and connections files.  The caps (representing the widget
    capability bits) always contain a value.  The rest may contain
    value(s) if the attribute exists on the node.  Only connections file
    show multiple values while other attributes have zero or one single
    value.
    
    An example of ls -R output is like below:
    % ls -R /sys/bus/hdaudio/devices/hdaudioC0D0/
    /sys/bus/hdaudio/devices/hdaudioC0D0/widgets/:
    01/  04/  07/  0a/  0d/  10/  13/  16/  19/  1c/  1f/  22/
    02/  05/  08/  0b/  0e/  11/  14/  17/  1a/  1d/  20/  23/
    03/  06/  09/  0c/  0f/  12/  15/  18/  1b/  1e/  21/
    
    /sys/bus/hdaudio/devices/hdaudioC0D0/widgets/01:
    amp_in_caps  amp_out_caps  power_caps
    
    /sys/bus/hdaudio/devices/hdaudioC0D0/widgets/02:
    amp_in_caps  amp_out_caps  caps  connections  pin_caps  pin_cfg
    power_caps
    
    /sys/bus/hdaudio/devices/hdaudioC0D0/widgets/03:
    .....
    Signed-off-by: NTakashi Iwai <tiwai@suse.de>
    3256be65
hda_codec.c 135.1 KB