sound/designs/procfile.rst

15 card-specific files are stored in the ``card*`` subdirectories.
32 	Lists the ALSA native device mappings.
40 	``<card>-<device>: <name>``
44 	``<card>-<device>: <id>: <name> : <sub-streams>``
51 	Lists the OSS device mappings.
61 The card-specific files are found in ``/proc/asound/card*`` directories.
68 stream.  The number after ``pcm`` is the PCM device number from 0, and
72 The status of MIDI I/O is found in ``midi*`` files.  It shows the device
73 name and the received/transmitted bytes through the MIDI device.
81 mapping by writing to this device.  Read OSS-Emulation.txt for
89 	The general information of this PCM device: card #, device #,
123 ``card*/pcm*/sub*/info``
124 	The general information of this PCM sub-stream.
126 ``card*/pcm*/sub*/status``
127 	The current status of this PCM sub-stream, elapsed time,
130 ``card*/pcm*/sub*/hw_params``
131 	The hardware parameters set for this sub-stream.
133 ``card*/pcm*/sub*/sw_params``
134 	The soft parameters set for this sub-stream.
136 ``card*/pcm*/sub*/prealloc``
137 	The buffer pre-allocation information.
139 ``card*/pcm*/sub*/xrun_injection``
142 	This entry is write-only.
147 ``card*/codec97#*/ac97#?-?``
151 ``card*/codec97#0/ac97#?-?+regs``
160 	# echo 02 9f1f > /proc/asound/card0/codec97#0/ac97#0-0+regs
171 HD-Audio Codecs
207 	Lists the OSS-compatible sequencer stuffs.
219 - the name of the driver/card, show in ``/proc/asound/cards``
220 - the register dump, if available (e.g. ``card*/cmipci``)
224 - set-up of PCM, shown in hw_parms, sw_params, and status in the PCM
225   sub-stream directory
229 - AC97 proc files, ``codec97#*/*`` files
233 - output of ``lsusb -v``
234 - ``stream*`` files in card directory
237 The ALSA bug-tracking system is found at:
238 https://bugtrack.alsa-project.org/alsa-bug/