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thinkpad-acpi: basic ALSA mixer support (v2)

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Add the basic ALSA mixer functionality.  The mixer is event-driven,
and will work fine on IBM ThinkPads.  I expect Lenovo ThinkPads will
cause some trouble with the event interface.

Heavily based on work by Lorne Applebaum <lorne.applebaum@gmail.com>
and ideas from Matthew Garrett <mjg@redhat.com>.

Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Cc: Lorne Applebaum <lorne.applebaum@gmail.com>
Cc: Matthew Garrett <mjg@redhat.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Henrique de Moraes Holschuh
2009-12-15 21:51:11 -02:00
committed by Len Brown
parent c7ac6291ea
commit 0d204c34e8
2 changed files with 239 additions and 5 deletions
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7
Documentation/laptops/thinkpad-acpi.txt
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@@ -1096,6 +1096,7 @@ Volume control
--------------
procfs: /proc/acpi/ibm/volume
ALSA: "ThinkPad Console Audio Control", default ID: "ThinkPadEC"
NOTE: by default, the volume control interface operates in read-only
mode, as it is supposed to be used for on-screen-display purposes.
@@ -1144,9 +1145,8 @@ The driver will operate in volume_mode=3 by default. If that does not
work well on your ThinkPad model, please report this to
ibm-acpi-devel@lists.sourceforge.net.
The ALSA mixer interface to this feature is still missing, but patches
to add it exist. That problem should be addressed in the not so
distant future.
The driver supports the standard ALSA module parameters. If the ALSA
mixer is disabled, the driver will disable all volume functionality.
Fan control and monitoring: fan speed, fan enable/disable
@@ -1478,3 +1478,4 @@ Sysfs interface changelog:
0x020700: Support for mute-only mixers.
Volume control in read-only mode by default.
Marker for ALSA mixer support.