Neo 1973 audio subsystem

Revision as of 19:42, 9 March 2007 (view source) HaraldWelte (Talk | contribs) m (→‎Userspace Sound Control Daemon) ← Older edit		Revision as of 21:24, 20 May 2007 (view source) Spida (Talk | contribs) m (indentation typo) Newer edit →
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	This is working since ASoC 0.13rc2 (-moko6 kernel)		This is working since ASoC 0.13rc2 (-moko6 kernel)
−	==== sound playback via A2DP =====	+	==== sound playback via A2DP ====
	FIXME		FIXME

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Revision as of 21:24, 20 May 2007

Contents 1 Phase0 Quick Start 2 Voice Calls 2.1 using phone-internal microphone and speaker 2.1.1 Internal Codec Route 2.1.2 Driver Status 2.1.3 asound.state 2.2 using analog (4pin 2.5mm) headset 2.2.1 Internal Codec Route 2.2.2 Driver Status 2.2.3 asound.state 2.3 using Bluetooth headset 2.3.1 Internal Codec Route 2.3.2 Driver Status 2.3.3 asound.state 3 Multimedia 3.1 sound playback to speakers 3.1.1 Driver Status 3.1.2 asound.state 3.2 sound playback to headphone 3.2.1 Driver Status 3.3 sound playback via A2DP 3.3.1 Driver Status 3.4 voice recording 3.4.1 Driver Status 4 Call recording 4.1 recording 4.1.1 Driver Status 4.2 playback 4.2.1 Driver Status 5 Userspace Sound Control Daemon 5.1 audio playback 5.2 audio event management 5.3 audio scenario management 6 Important issues/pitfalls 6.1 Ringtone while headset playback

Phase0 Quick Start

wget http://opensource.wolfsonmicro.com/~gg/neo1973/stereoout.state
wget http://www-public.tu-bs.de:8080/~y0019680/tmp/thereisnophone.mp3
alsactl -f stereoout.state restore
madplay thereisnophone.mp3

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

asound.state

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

Internal Codec Route

Neo Mode is GSM Bluetooth Amp Mode is Off

• audio path BT -> GSM
  • Vx DAC
  • Mono Voice Volume
  • Mono Mixer Voice Playback Switch
  • Mono Volume
  • Mono 2 Mux [Inverted Mono 1]

• audio path GSM -> BT
  • RXP/RXN
  • Rx Mixer [RXP - RXN]
  • ALC Mixer Rx
  • Left PGA
  • Capture Mixer Mux [PGA]
  • Capture Left Mixer [Analogue Mix Left]
  • Left ADC

Driver Status

Should be support by ASoC 0.13.3

Example of how to setup PCM->BT link.

http://opensource.wolfsonmicro.com/~gg/bluetooth-pcm/bluetooth_pcm.c

asound.state

http://opensource.wolfsonmicro.com/~gg/neo1973/gsmbluetooth.state

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)

This should also work on ASoC 0.13.3

asound.state

https://people.openmoko.org/laforge/gta01/gta01b_v2/alsa/stereoout.state

For ASoC 0.13.3 http://opensource.wolfsonmicro.com/~gg/neo1973/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

The userspace sound control deamon might be a separate process or (more likely) part of some larger general hardware management daemon.

It will provide the following features:

audio playback

In order to provide the desired functionality, the daemon first needs to be capable of doing audio playback.

• supported formats
  • mp3 (libmad)
  • ogg/vorbis (libtremor)
  • mod (mikmod)
  • sid (sidplay)
• supported functionality
  • start and stop playback
  • interrupt previous sound to play new sound
  • enqueue new sound at end of previous sound
  • smooth fade-in/fade-out

audio event management

• manage a set of events (basically just a name for each event)
• manage a set of audio themes
  • each theme contains list of event->audio_file_name mappings
  • themes stored/managed via gconf
• manage event sources
  • built-in event sources, e.g. touchscreen/button press
  • external event sources (e.g. gsmd, dbus, ...)

audio scenario management

• e.g. dialer or even gsmd can request audio subsystem to switch to voicecall mode
• this mainly affects codec/amplifier analog audio routing
• integrated with bluetooth in case of BT headset or A2DP use

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?