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authorTakashi Iwai <tiwai@suse.de>2009-06-17 19:17:18 +0400
committerTakashi Iwai <tiwai@suse.de>2009-06-24 13:53:43 +0400
commit768248256339da88d65088c8beffe1a3dcd9f1ca (patch)
treebcaa585a61ec370fcd7a204b993091cd6d8655c9 /Documentation/sound
parent4ea6fbc8eb23c3ae5fd2fb55a340ab85c8649bce (diff)
downloadlinux-768248256339da88d65088c8beffe1a3dcd9f1ca.tar.xz
ALSA: hda - Add description about patch loading
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'Documentation/sound')
-rw-r--r--Documentation/sound/alsa/HD-Audio.txt46
1 files changed, 46 insertions, 0 deletions
diff --git a/Documentation/sound/alsa/HD-Audio.txt b/Documentation/sound/alsa/HD-Audio.txt
index 88b7433d2f11..8bc9867c0a3a 100644
--- a/Documentation/sound/alsa/HD-Audio.txt
+++ b/Documentation/sound/alsa/HD-Audio.txt
@@ -403,6 +403,52 @@ re-configure based on that state, run like below:
------------------------------------------------------------------------
+Early Patching
+~~~~~~~~~~~~~~
+When CONFIG_SND_HDA_PATCH_LOADER=y is set, you can pass a "patch" as a
+firmware file for modifying the HD-audio setup before initializing the
+codec. This can work basically like the reconfiguration via sysfs in
+the above, but it does it before the first codec configuration.
+
+The patch file looks like below:
+
+------------------------------------------------------------------------
+ [codec]
+ 0x12345678 0xabcd1234 2
+
+ [model]
+ auto
+
+ [pincfg]
+ 0x12 0x411111f0
+
+ [verb]
+ 0x20 0x500 0x03
+ 0x20 0x400 0xff
+
+ [hint]
+ hp_detect = yes
+------------------------------------------------------------------------
+
+The file needs to have a line `[codec]`. The next line should contain
+three numbers indicating the codec vendor-id (0x12345678 in the
+example), the codec subsystem-id (0xabcd1234) and the address (2) of
+the codec. The rest patch entries are applied to this specified codec
+until another codec entry is given.
+
+The `[model]` line allows to change the model name of the each codec.
+In the example above, it will be changed to model=auto.
+Note that this overrides the module option.
+
+After the `[pincfg]` line, the contents are parsed as the initial
+default pin-configurations just like `user_pin_configs` sysfs above.
+The values can be shown in user_pin_configs sysfs file, too.
+
+Similarly, the lines after `[verb]` are parsed as `init_verbs`
+sysfs entries, and the lines after `[hint]` are parsed as `hints`
+sysfs entries, respectively.
+
+
Power-Saving
~~~~~~~~~~~~
The power-saving is a kind of auto-suspend of the device. When the