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There's a four-ring 2.5mm stereo jack which provides connectivity to old-fashioned wired headsets.
The headsets used by Motorola smartphones (A780,A1200, ...) and the V-360 have a compatible configuration.
The headsets used by some Nokia phones (N95, ...) have the same jack but they are incompatible. For technical information about rewiring them visit Analog wired Headset Nokia
ring
1(base): GND
2: left out
3: right out
4(tip): mic + HOLD-button(press:short to GND)
Pinout: [1]
base = ground speaker left (internal impedance 33R) to ground. (+jackinsert detection) speaker right (internal impedance 33R) to ground. tip = mic electret condenser type, to ground. bias (power for mic) 2K2 from +3.3v(wolfson codec) (+HoldButton shortcircuit to ground)
Dylan proposed a proof of concept scripts to fix something about the headset insertion/removal being incorrectly acted upon.
Controls affecting bluetooth mic volume for GSM:
Controls affecting handset earpiece volume for GSM:
Controls affecting wired headset earpiece volume for GSM:
Controls affecting handset mic volume for GSM:
Controls affecting wired headset mic volume for GSM:
Controls affecting handset mic volume for GSM:
Controls affecting wired headset mic volume for GSM:
Posted on the Community list Sep 17, 2008; 08:45pm
Angus has written a python mixer to control the mic volumes for the various headsets. The speaker volumes will be added when I trace their path through the wolfson. It'll currently control handset, wired headset and bluetooth volumes. You currently need to tell it which to control as I have not found any dbus signals to tell what alsa state you are currently in. The displayed volumes may be wrong if you start the volume control before the alsa state change. One you use a control to set its volume it will reflect the state of the underlying hardware.
You'll need these 3 files
http://handheldshell.com/python-pyalsaaudio_0.3-ml0_armv4t.ipk http://handheldshell.com/pymixer.py http://handheldshell.com/volume.desktop
install pyalsaausdio and pygtk
copy pymxer /usr/bin copy volume.desktop /usr/share/applications
You can now control mic volume.
Angus Ainslie