[alsa-devel] [PATCH 2/8] ASoC: TWL4030: Add Analog PGA control switch to DAPM

[Peter Ujfalusi]

On Monday 08 December 2008 13:23:37 ext Mark Brown wrote:
> On Mon, Dec 08, 2008 at 10:09:02AM +0200, Peter Ujfalusi wrote:
> > +	/* Analog PGAs
> > +	 * bit 0: APGA enable
> > +	 * bit 1: Digital to analog path enable
> > +	 */
> > +	SND_SOC_DAPM_REG(snd_soc_dapm_pga, "ARXR1_APGA",
> > +			TWL4030_REG_ARXR1_APGA_CTL, 0, 0x3, 0x3, 0x0),
> > +	SND_SOC_DAPM_REG(snd_soc_dapm_pga, "ARXL1_APGA",
> > +			TWL4030_REG_ARXL1_APGA_CTL, 0, 0x3, 0x3, 0x0),
> > +	SND_SOC_DAPM_REG(snd_soc_dapm_pga, "ARXR2_APGA",
> > +			TWL4030_REG_ARXR2_APGA_CTL, 0, 0x3, 0x3, 0x0),
> > +	SND_SOC_DAPM_REG(snd_soc_dapm_pga, "ARXL2_APGA",
> > +			TWL4030_REG_ARXL2_APGA_CTL, 0, 0x3, 0x3, 0x0),
> > +
>
> The PGA should be standard SND_SOC_DAPM_PGA()s with the digital to
> analogue switches used to implement mute controls for them.

Should I 'chain' these switches, like this:

/* Digital to analog enable/disable */
SND_SOC_DAPM_PGA("ARXR1_APGA", TWL4030_REG_ARXR1_APGA_CTL,
		1, 0, NULL, 0),
/* APGA enable/disable */
SND_SOC_DAPM_PGA("ARXR1_APGA Enable", TWL4030_REG_ARXR1_APGA_CTL,
		0, 0, NULL, 0),
...
{"ARXR1_APGA Enable", NULL, "DACR1"},
{"ARXR1_APGA", NULL, "ARXR1_APGA Enable"},

Or should I use the wcontrols, wncontrols to implement the DA enable/disable:

static const struct snd_kcontrol_new arxr1_apga_controls[] = {
SOC_DAPM_SINGLE("ARXR1_APGA Switch", TWL4030_REG_ARXR1_APGA_CTL, 1, 1, 0),
};
...
SND_SOC_DAPM_PGA("ARXR1_APGA", TWL4030_REG_ARXR1_APGA_CTL,
		0, 0, &arxr1_apga_controls[0], ARRAY_SIZE(arxr1_apga_controls)),

If the later is preferred, than probably it would be better to move the 
"DAC1 Analog Playback Volume" and "DAC2 Analog Playback Volume" from the 
twl4030_snd_controls to twl4030_dapm_widgets, separate the four paths and use 
SOC_DAPM_SINGLE_TLV("ARXR1_APGA Playback Volume" ?
Hmm, in this case the SOC_DAPM_SINGLE_TLV can be also part of the 
arxr1_apga_controls...

-- 
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