[alsa-devel] [PATCHv2] TWL4030: hands-free start-up sequence.

[stanley.miao]

Changes from last version:

1, clear the bits explicitly.

Stanley.

On Thu, 2008-12-11 at 23:28 +0800, Stanley.Miao wrote:
> A special start-up sequence is required to reduce the pop-noise of Class D
> amplifier when enable hands-free on TWL4030.
> 
> Signed-off-by: Stanley.Miao <stanley.miao at windriver.com>
> ---
>  sound/soc/codecs/twl4030.c |   34 ++++++++++++++++++++++++++++++----
>  sound/soc/codecs/twl4030.h |    6 ++++++
>  2 files changed, 36 insertions(+), 4 deletions(-)
> 
> diff --git a/sound/soc/codecs/twl4030.c b/sound/soc/codecs/twl4030.c
> index 1377302..5184888 100644
> --- a/sound/soc/codecs/twl4030.c
> +++ b/sound/soc/codecs/twl4030.c
> @@ -322,6 +322,30 @@ static int outmixer_event(struct snd_soc_dapm_widget *w,
>  	return ret;
>  }
>  
> +static int handsfree_event(struct snd_soc_dapm_widget *w,
> +		struct snd_kcontrol *kcontrol, int event)
> +{
> +	struct soc_enum *e = (struct soc_enum *)w->kcontrols->private_value;
> +	unsigned char hs_ctl;
> +
> +	hs_ctl = twl4030_read_reg_cache(w->codec, e->reg);
> +
> +	if (hs_ctl & TWL4030_HF_CTL_REF_EN) {
> +		hs_ctl |= TWL4030_HF_CTL_RAMP_EN;
> +		twl4030_write(w->codec, e->reg, hs_ctl);
> +		hs_ctl |= TWL4030_HF_CTL_LOOP_EN;
> +		twl4030_write(w->codec, e->reg, hs_ctl);
> +		hs_ctl |= TWL4030_HF_CTL_HB_EN;
> +		twl4030_write(w->codec, e->reg, hs_ctl);
> +	} else {
> +		hs_ctl &= ~(TWL4030_HF_CTL_RAMP_EN | TWL4030_HF_CTL_LOOP_EN
> +				| TWL4030_HF_CTL_HB_EN);
> +		twl4030_write(w->codec, e->reg, hs_ctl);
> +	}
> +
> +	return 0;
> +}
> +
>  /*
>   * Some of the gain controls in TWL (mostly those which are associated with
>   * the outputs) are implemented in an interesting way:
> @@ -806,10 +830,12 @@ static const struct snd_soc_dapm_widget twl4030_dapm_widgets[] = {
>  	SND_SOC_DAPM_MUX("CarkitR Mux", SND_SOC_NOPM, 0, 0,
>  		&twl4030_dapm_carkitr_control),
>  	/* HandsfreeL/R */
> -	SND_SOC_DAPM_MUX("HandsfreeL Mux", TWL4030_REG_HFL_CTL, 5, 0,
> -		&twl4030_dapm_handsfreel_control),
> -	SND_SOC_DAPM_MUX("HandsfreeR Mux", TWL4030_REG_HFR_CTL, 5, 0,
> -		&twl4030_dapm_handsfreer_control),
> +	SND_SOC_DAPM_MUX_E("HandsfreeL Mux", TWL4030_REG_HFL_CTL, 5, 0,
> +		&twl4030_dapm_handsfreel_control, handsfree_event,
> +		SND_SOC_DAPM_POST_PMU|SND_SOC_DAPM_POST_PMD),
> +	SND_SOC_DAPM_MUX_E("HandsfreeR Mux", TWL4030_REG_HFR_CTL, 5, 0,
> +		&twl4030_dapm_handsfreer_control, handsfree_event,
> +		SND_SOC_DAPM_POST_PMU|SND_SOC_DAPM_POST_PMD),
>  
>  	SND_SOC_DAPM_ADC("ADCL", "Left Capture", SND_SOC_NOPM, 0, 0),
>  	SND_SOC_DAPM_ADC("ADCR", "Right Capture", SND_SOC_NOPM, 0, 0),
> diff --git a/sound/soc/codecs/twl4030.h b/sound/soc/codecs/twl4030.h
> index a2065d4..54615c7 100644
> --- a/sound/soc/codecs/twl4030.h
> +++ b/sound/soc/codecs/twl4030.h
> @@ -191,6 +191,12 @@
>  #define TWL4030_RAMP_DELAY_2581MS	0x1C
>  #define TWL4030_RAMP_EN			0x02
>  
> +/* HFL_CTL (0x29, 0x2A) Fields */
> +#define TWL4030_HF_CTL_HB_EN		0x04
> +#define TWL4030_HF_CTL_LOOP_EN		0x08
> +#define TWL4030_HF_CTL_RAMP_EN		0x10
> +#define TWL4030_HF_CTL_REF_EN		0x20
> +
>  /* APLL_CTL (0x3A) Fields */
>  
>  #define TWL4030_APLL_EN			0x10