ubuntu-phone team mailing list archive

[f69m <launchpad@xxxxxxx>]

Hi,

Following the porting guide, I tried to add the Alsa UCM configuration 
files for my tablet. They are found at boot time and the default (reset) 
configuration is executed, but the devices (Speaker and Headphones) are 
never activated.

BTW, as a basis I used the latest stable loop-mounted image #144.

Here is what I did and what I saw in more detail:

1) Patched the kernel to set the device name to "tegra-wm8903" instead 
of "tegra-codecs", which was used by two other chipsets too.

2) Created directory /usr/share/alsa/ucm/tegra-wm8903 with the two files 
tegra-wm8903.conf and hifi (see attachments for reference).

3) The first version had some cset commands that made the kernel crash 
and reboot right away. That's why I know that the files are actually 
found and executed at boot time.

4) After removing those commands, the speakers were muted in pulseaudio. 
Removing the commands to switch off speakers in the default reset 
settings finally made the speakers work.

5) Plugging in headphones, I see the kernel acting on that and the 
speakers go off. But looking at Alsa settings, I see that only one of 
the two settings has changed. The 2nd one! I rather suspect something or 
someone else is switching them off (possibly the kernel and Alsa just 
sees it?). The headphones are not properly enabled, but I can use 
alsamixer to make them work.

6) Then I tried to use alsaucm to figure out what is going on. It did 
show the verb "HiFi" and my two devices, but any attempt to enable or 
disable something failed. Possibly I don't understand the right sequence 
or the right syntax, as it is all thoroughly undocumented. ;-)

So, after all my digging, I am pretty sure that the files are located 
and parsed properly and the default reset section is executed at boot 
time and whenever I run alsaucm. But the two devices are never enabled 
or disabled.

Any ideas?
Anything would be helpful: how to get more verbose logging from the UCM 
handlers, hints how the devices are supposed to be enabled/disabled, ...
Possibly I need to create some trigger event?

Thanks!

SectionVerb {

	EnableSequence [
	]

	DisableSequence [
	]

	Value {
		PlaybackPCM "hw:tegrawm8903"
		PlaybackVolume "Digital Playback Volume"
	}
}

SectionDevice."Speaker" {
	Comment "Speaker playback"

	EnableSequence [
		cdev "hw:tegrawm8903"
		cset "name='Int Spk Switch' on"
		cset "name='Speaker Switch' on,on"
	]

	DisableSequence [
		cdev "hw:tegrawm8903"
		cset "name='Int Spk Switch' off"
		cset "name='Speaker Switch' off,off"
	]

	Value {
		  PlaybackChannels "2"
	}
}

SectionDevice."Headphones" {
	Comment "Headphones playback"

	EnableSequence [
		cdev "hw:tegrawm8903"
		cset "name='Headphone Jack Switch' on"
		cset "name='Headphone Switch' on,on"
	]

	DisableSequence [
		cdev "hw:tegrawm8903"
		cset "name='Headphone Jack Switch' off"
		cset "name='Headphone Switch' off,off"
	]

	Value {
		PlaybackChannels "2"
	}
}

SectionUseCase."HiFi" {
	File "hifi"
	Comment "Play HiFi qualiy Music"
}

SectionDefaults [
	cdev "hw:tegrawm8903"

	exec "echo Setting UCM defaults for tegra-wm8903"

	cset "name='Left Speaker Mixer DACL Switch' on"
	cset "name='Left Speaker Mixer DACR Switch' off"
	cset "name='Right Speaker Mixer DACL Switch' off"
	cset "name='Right Speaker Mixer DACR Switch' on"

	cset "name='Left Output Mixer DACL Switch' on"
	cset "name='Left Output Mixer DACR Switch' off"
	cset "name='Right Output Mixer DACL Switch' off"
	cset "name='Right Output Mixer DACR Switch' on"

	cset "name='Left Input PGA Switch' off"
	cset "name='Right Input PGA Switch' off"
]