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ASoC: TWL4030: hands-free start-up sequence. 

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@windriver.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Stanley.Miao 2008-12-11 23:28:10 +08:00 committed by Mark Brown
parent 4544f8a22f
commit 49d92c7d5b
2 changed files with 36 additions and 4 deletions
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34
sound/soc/codecs/twl4030.c
View File

@ -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),

6
sound/soc/codecs/twl4030.h
View File

@ -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