alsa-mixer: Add "Headphone Mic" support for 3-pin ASUS netbooks

Some ASUS netbooks, such as the 1015 CX, have only one 3.5 mm jack,
but it can be used either as a headphone or as a mic (but not both
simultaneously).

This patch adds support for the "Headphone Mic" path that is used
on these devices, so that we can use the jack as an external mic, and
doing so without muting the speaker.

BugLink: https://bugs.launchpad.net/bugs/1018262
Signed-off-by: David Henningsson <david.henningsson@canonical.com>

src/modules/alsa/mixer/paths/analog-input-headphone-mic.conf

@@ -0,0 +1,103 @@
+# This file is part of PulseAudio.
+#
+# PulseAudio is free software; you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License as
+# published by the Free Software Foundation; either version 2.1 of the
+# License, or (at your option) any later version.
+#
+# PulseAudio is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+# General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with PulseAudio; if not, write to the Free Software Foundation,
+# Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+
+; For some ASUS netbooks that have one jack that can be either a Headphone
+; *or* a mic. This path will be active only when it is used as a mic.
+;
+; See analog-output.conf.common for an explanation on the directives
+
+[General]
+priority = 87
+name = analog-input-microphone
+
+[Jack Headphone Mic]
+required-any = any
+state.plugged = unknown
+
+[Element Headphone Mic Boost]
+required-any = any
+switch = select
+volume = merge
+override-map.1 = all
+override-map.2 = all-left,all-right
+
+[Element Headphone Mic]
+required-any = any
+switch = mute
+volume = merge
+override-map.1 = all
+override-map.2 = all-left,all-right
+
+[Element Capture]
+switch = mute
+volume = merge
+override-map.1 = all
+override-map.2 = all-left,all-right
+
+[Element Input Source]
+enumeration = select
+
+[Option Input Source:Headphone Mic]
+name = analog-input-microphone
+required-any = any
+
+[Element Capture Source]
+enumeration = select
+
+[Option Capture Source:Headphone Mic]
+name = analog-input-microphone
+required-any = any
+
+; Make sure the internal speakers are not auto-muted when you plug a mic in
+[Element Auto-Mute Mode]
+enumeration = select
+
+[Option Auto-Mute Mode:Disabled]
+name = analog-input-microphone
+
+[Element Front Mic]
+switch = off
+volume = off
+
+[Element Internal Mic]
+switch = off
+volume = off
+
+[Element Rear Mic]
+switch = off
+volume = off
+
+[Element Dock Mic]
+switch = off
+volume = off
+
+[Element Dock Mic Boost]
+switch = off
+volume = off
+
+[Element Internal Mic Boost]
+switch = off
+volume = off
+
+[Element Front Mic Boost]
+switch = off
+volume = off
+
+[Element Rear Mic Boost]
+switch = off
+volume = off
+
+.include analog-input-mic.conf.common

src/modules/alsa/mixer/paths/analog-input-internal-mic.conf

@@ -129,6 +129,14 @@ volume = off
 switch = off
 volume = off
 
+[Element Headphone Mic]
+switch = off
+volume = off
+
+[Element Headphone Mic Boost]
+switch = off
+volume = off
+
 [Element Mic Boost]
 switch = off
 volume = off

src/modules/alsa/mixer/paths/analog-output-headphones.conf

@@ -28,6 +28,11 @@ required-any = any
 [Jack Headphone]
 required-any = any
 
+# This jack can be either a headphone *or* a mic. Used on some ASUS netbooks.
+[Jack Headphone Mic]
+required-any = any
+state.plugged = unknown
+
 [Element Hardware Master]
 switch = mute
 volume = merge

src/modules/alsa/mixer/profile-sets/default.conf

@@ -109,7 +109,7 @@ priority = 1
 device-strings = front:%f hw:%f
 channel-map = left,right
 paths-output = analog-output analog-output-speaker analog-output-desktop-speaker analog-output-headphones analog-output-headphones-2 analog-output-mono analog-output-lfe-on-mono
-paths-input = analog-input-front-mic analog-input-rear-mic analog-input-internal-mic analog-input-dock-mic analog-input analog-input-mic analog-input-linein analog-input-aux analog-input-video analog-input-tvtuner analog-input-fm analog-input-mic-line
+paths-input = analog-input-front-mic analog-input-rear-mic analog-input-internal-mic analog-input-dock-mic analog-input analog-input-mic analog-input-linein analog-input-aux analog-input-video analog-input-tvtuner analog-input-fm analog-input-mic-line analog-input-headphone-mic
 priority = 10
 
 [Mapping analog-surround-40]

src/modules/alsa/mixer/profile-sets/extra-hdmi.conf

@@ -35,7 +35,7 @@ priority = 1
 device-strings = front:%f hw:%f
 channel-map = left,right
 paths-output = analog-output analog-output-speaker analog-output-desktop-speaker analog-output-headphones analog-output-headphones-2 analog-output-mono analog-output-lfe-on-mono
-paths-input = analog-input-front-mic analog-input-rear-mic analog-input-internal-mic analog-input-dock-mic analog-input analog-input-mic analog-input-linein analog-input-aux analog-input-video analog-input-tvtuner analog-input-fm analog-input-mic-line
+paths-input = analog-input-front-mic analog-input-rear-mic analog-input-internal-mic analog-input-dock-mic analog-input analog-input-mic analog-input-linein analog-input-aux analog-input-video analog-input-tvtuner analog-input-fm analog-input-mic-line analog-input-headphone-mic
 priority = 10
 
 [Mapping analog-surround-40]