Neo 1973 audio subsystem
From Openmoko
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Voice Calls
using phone-internal microphone and speaker
This is the default case.
- microphone path
- input: built in microphone attached to wolfson MIC2/MIC2N
- routed from wolfson MIC2/MIC2N to MONO1/MONO2
- arrives at GSM Modem input MICIP/MICIN
- speaker path
- input: GSM Modem attached to wolfson RXN/RXP
- routed from wolfson RXN/RXP to ROUT1/LOUT1
- arrives on LM4857 RIN/LIN
- routed on LM4856 to EP+/EP-
Internal Codec Route
Neo Mode is GSM Handset Amp Mode is Call Speaker
- audio path Mic -> GSM
- MIC2/MIC2N
- Mic2 Volume
- ALC Micer Mic2
- Left PGA
- Mic Sidetone Mux [Left PGA]
- Mono Sidetone Volume
- Mono Mixer Sidetone Playback Switch
- Mono Volume
- Mono 2 Mux [Inverted Mono 1]
- audio path GSM -> Speaker
- RXP/RXN
- Rx Mixer [RXP - RXN]
- Line Left Mux [Rx Mix]/Line Right Mux [Rx Mix]
- Left Mixer Bypass Playback Switch/Right Mixer Bypass Playback Switch
- Headphone Volume
Driver Status
This should be supported by ASoC 0.13rc3 (-moko7 kernel) on.
ASoC 0.13.3 should have same functionality but has renamed the soundcard to neo1973.
asound.state
https://people.openmoko.org/laforge/gta01/gta01b_v2/alsa/gsmhandset.state
For ASoC 0.13.3 http://opensource.wolfsonmicro.com/~gg/neo1973/gsmhandset.state
using analog (4pin 2.5mm) headset
This is also a quite common case, since we ship the headset with the phone
Headset Detection is done via GPIO on S3C2410
- microphone path
- input: headset mic vial HS_MIC attached to wolfson MIC1
- routed from wolfson MIC1 to MONO1/MONO2
- arrives at GSM Modem input MICIP/MICIN
- speaker path
- input: GSM Modem attached to wolfson RXN/RXP
- routed from wolfson RXN/RXP to ROUT1/LOUT1
- arrives on LM4857 RIN/LIN
- routed on LM4856 to LHP/RHP
Internal Codec Route
Neo Mode is GSM Headset Amp Mode is Headphones
- audio path Mic -> GSM
- MIC1
- Mic Selection Mux [Mic 1]
- ALC Mixer Mic1
- Left PGA
- Mic Sidetone Mux [Left PGA]
- Mono Sidetone Volume
- Mono Mixer Sidetone Playback Switch
- Mono Volume
- Mono 2 Mux [Inverted Mono 1]
- Audio path GSM -> Headphones
- RXP/RXN
- Rx Mixer [RXP - RXN]
- Line Left Mux [Rx Mix]/Line Right Mux [Rx Mix]
- Left Mixer Bypass Playback Switch/Right Mixer Bypass Playback Switch
- Headphone Volume
Driver Status
Supported in ASoC 0.13.3
State File
http://opensource.wolfsonmicro.com/~gg/neo1973/gsmheadset.state
using Bluetooth headset
Headset detection via software
- microphone path
- input: from bluetooth via PCM interface to wolfson
- wolfson: DAC
- wolfson routes analog signal to MONO1/MONO2
- arrives at GSM Modem input MICIP/MICIN
- speaker path
- input: GSM Modem attached to wolfson RXN/RXP
- wolfson: ADC
- wolfson: routes digital signal to PCM
- arrives on bluetooth chip via PCM
Driver Status
UNKNOWN
Multimedia
sound playback to speakers
This is an important mode since it is also required for ringtone playback
- speaker path
- input: from S3C2410 via IIS interface to wolfson
- wolfson: DAC
- wolfson: route to ROUT1/LOUT1
- LM4857: arrives on RIN/LIN
- LM4857: route to LLS+-/RLS+-
Driver Status
This is working since ASoC 0.13rc2 (-moko6 kernel)
asound.state
https://people.openmoko.org/laforge/gta01/gta01b_v2/alsa/stereoout.state
sound playback to headphone
- speaker path
- input: from S3C2410 via IIS interface to wolfson
- wolfson: DAC
- wolfson: route to ROUT1/LOUT1
- LM4857: arrives on RIN/LIN
- routed on LM4856 to LHP/RHP
Driver Status
This is working since ASoC 0.13rc2 (-moko6 kernel)
sound playback via A2DP =
FIXME
Driver Status
UNKNOWN
voice recording
This is mainly used to record notes
- microphone path
- can be from built-in mic
- or from headset
- or bluetooth headset
Driver Status
UNKNOWN
Call recording
This is a nice wishlist item. The user should be able to receive the full-duplex audio from the wolfson codec, and record it using the S3C2410 IIS.
recording
FIXME
Driver Status
UNKNOWN
playback
FIXME
Driver Status
UNKNOWN
Userspace Sound Control Daemon
FIXME
Important issues/pitfalls
Ringtone while headset playback
If the user is listening to music on the headset, do we want to mix the ring tones only into the headset audio, or actually interrupt and play it on the speaker?
