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ASoC: Docs: update DAPM
Update the DAPM documentation and bring it up to date with the current code base. This includes API changes and new widgets. Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com> Signed-off-by: Mark Brown <broonie@linaro.org>
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Liam Girdwood
Mark Brown
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commit
630a1b3b4f
@ -21,7 +21,7 @@ level power systems.
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There are 4 power domains within DAPM
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1. Codec domain - VREF, VMID (core codec and audio power)
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1. Codec bias domain - VREF, VMID (core codec and audio power)
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Usually controlled at codec probe/remove and suspend/resume, although
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can be set at stream time if power is not needed for sidetone, etc.
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@ -63,14 +63,22 @@ Audio DAPM widgets fall into a number of types:-
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o Line - Line Input/Output (and optional Jack)
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o Speaker - Speaker
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o Supply - Power or clock supply widget used by other widgets.
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o Regulator - External regulator that supplies power to audio components.
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o Clock - External clock that supplies clock to audio componnents.
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o AIF IN - Audio Interface Input (with TDM slot mask).
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o AIF OUT - Audio Interface Output (with TDM slot mask).
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o Siggen - Signal Generator.
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o DAI IN - Digital Audio Interface Input.
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o DAI OUT - Digital Audio Interface Output.
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o DAI Link - DAI Link between two DAI structures */
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o Pre - Special PRE widget (exec before all others)
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o Post - Special POST widget (exec after all others)
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(Widgets are defined in include/sound/soc-dapm.h)
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Widgets are usually added in the codec driver and the machine driver. There are
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convenience macros defined in soc-dapm.h that can be used to quickly build a
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list of widgets of the codecs and machines DAPM widgets.
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Widgets can be added to the sound card by any of the component driver types.
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There are convenience macros defined in soc-dapm.h that can be used to quickly
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build a list of widgets of the codecs and machines DAPM widgets.
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Most widgets have a name, register, shift and invert. Some widgets have extra
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parameters for stream name and kcontrols.
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@ -80,11 +88,13 @@ parameters for stream name and kcontrols.
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-------------------------
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Stream Widgets relate to the stream power domain and only consist of ADCs
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(analog to digital converters) and DACs (digital to analog converters).
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(analog to digital converters), DACs (digital to analog converters),
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AIF IN and AIF OUT.
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Stream widgets have the following format:-
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SND_SOC_DAPM_DAC(name, stream name, reg, shift, invert),
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SND_SOC_DAPM_AIF_IN(name, stream, slot, reg, shift, invert)
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NOTE: the stream name must match the corresponding stream name in your codec
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snd_soc_codec_dai.
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@ -94,6 +104,11 @@ e.g. stream widgets for HiFi playback and capture
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SND_SOC_DAPM_DAC("HiFi DAC", "HiFi Playback", REG, 3, 1),
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SND_SOC_DAPM_ADC("HiFi ADC", "HiFi Capture", REG, 2, 1),
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e.g. stream widgets for AIF
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SND_SOC_DAPM_AIF_IN("AIF1RX", "AIF1 Playback", 0, SND_SOC_NOPM, 0, 0),
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SND_SOC_DAPM_AIF_OUT("AIF1TX", "AIF1 Capture", 0, SND_SOC_NOPM, 0, 0),
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2.2 Path Domain Widgets
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-----------------------
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@ -121,12 +136,14 @@ If you dont want the mixer elements prefixed with the name of the mixer widget,
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you can use SND_SOC_DAPM_MIXER_NAMED_CTL instead. the parameters are the same
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as for SND_SOC_DAPM_MIXER.
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2.3 Platform/Machine domain Widgets
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-----------------------------------
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2.3 Machine domain Widgets
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--------------------------
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Machine widgets are different from codec widgets in that they don't have a
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codec register bit associated with them. A machine widget is assigned to each
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machine audio component (non codec) that can be independently powered. e.g.
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machine audio component (non codec or DSP) that can be independently
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powered. e.g.
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o Speaker Amp
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o Microphone Bias
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@ -146,12 +163,12 @@ static int spitz_mic_bias(struct snd_soc_dapm_widget* w, int event)
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SND_SOC_DAPM_MIC("Mic Jack", spitz_mic_bias),
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2.4 Codec Domain
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----------------
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2.4 Codec (BIAS) Domain
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-----------------------
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The codec power domain has no widgets and is handled by the codecs DAPM event
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handler. This handler is called when the codec powerstate is changed wrt to any
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stream event or by kernel PM events.
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The codec bias power domain has no widgets and is handled by the codecs DAPM
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event handler. This handler is called when the codec powerstate is changed wrt
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to any stream event or by kernel PM events.
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2.5 Virtual Widgets
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@ -169,15 +186,16 @@ After all the widgets have been defined, they can then be added to the DAPM
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subsystem individually with a call to snd_soc_dapm_new_control().
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3. Codec Widget Interconnections
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================================
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3. Codec/DSP Widget Interconnections
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====================================
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Widgets are connected to each other within the codec and machine by audio paths
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(called interconnections). Each interconnection must be defined in order to
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create a map of all audio paths between widgets.
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Widgets are connected to each other within the codec, platform and machine by
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audio paths (called interconnections). Each interconnection must be defined in
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order to create a map of all audio paths between widgets.
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This is easiest with a diagram of the codec (and schematic of the machine audio
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system), as it requires joining widgets together via their audio signal paths.
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This is easiest with a diagram of the codec or DSP (and schematic of the machine
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audio system), as it requires joining widgets together via their audio signal
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paths.
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e.g., from the WM8731 output mixer (wm8731.c)
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@ -247,16 +265,9 @@ machine and includes the codec. e.g.
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o Mic Jack
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o Codec Pins
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When a codec pin is NC it can be marked as not used with a call to
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snd_soc_dapm_set_endpoint(codec, "Widget Name", 0);
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The last argument is 0 for inactive and 1 for active. This way the pin and its
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input widget will never be powered up and consume power.
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This also applies to machine widgets. e.g. if a headphone is connected to a
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jack then the jack can be marked active. If the headphone is removed, then
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the headphone jack can be marked inactive.
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Endpoints are added to the DAPM graph so that their usage can be determined in
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order to save power. e.g. NC codecs pins will be switched OFF, unconnected
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jacks can also be switched OFF.
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5 DAPM Widget Events
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