From: Wallace Lin savagecin0@gmail.com

Add new widget to control system clock for power saving.

Signed-off-by: Wallace Lin savagecin0@gmail.com Signed-off-by: Wallace Lin sjlin0@nuvoton.com --- sound/soc/codecs/nau8821.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+)

diff --git a/sound/soc/codecs/nau8821.c b/sound/soc/codecs/nau8821.c index 2600be250a3c..83a17c48d594 100644 --- a/sound/soc/codecs/nau8821.c +++ b/sound/soc/codecs/nau8821.c @@ -36,6 +36,7 @@

static int nau8821_configure_sysclk(struct nau8821 *nau8821, int clk_id, unsigned int freq); +static bool nau8821_is_jack_inserted(struct regmap *regmap);

struct nau8821_fll { int mclk_src; @@ -495,7 +496,33 @@ static int nau8821_output_dac_event(struct snd_soc_dapm_widget *w, return 0; }

+static int system_clock_control(struct snd_soc_dapm_widget *w, + struct snd_kcontrol *k, int event) +{ + struct snd_soc_component *component = + snd_soc_dapm_to_component(w->dapm); + struct nau8821 *nau8821 = snd_soc_component_get_drvdata(component); + + if (SND_SOC_DAPM_EVENT_OFF(event)) { + dev_dbg(nau8821->dev, "system clock control : POWER OFF\n"); + /* Set clock source to disable or internal clock before the + * playback or capture end. Codec needs clock for Jack + * detection and button press if jack inserted; otherwise, + * the clock should be closed. + */ + if (nau8821_is_jack_inserted(nau8821->regmap)) { + nau8821_configure_sysclk(nau8821, + NAU8821_CLK_INTERNAL, 0); + } else { + nau8821_configure_sysclk(nau8821, NAU8821_CLK_DIS, 0); + } + } + return 0; +} + static const struct snd_soc_dapm_widget nau8821_dapm_widgets[] = { + SND_SOC_DAPM_SUPPLY("System Clock", SND_SOC_NOPM, 0, 0, + system_clock_control, SND_SOC_DAPM_POST_PMD), SND_SOC_DAPM_SUPPLY("MICBIAS", NAU8821_R74_MIC_BIAS, NAU8821_MICBIAS_POWERUP_SFT, 0, NULL, 0), SND_SOC_DAPM_SUPPLY("DMIC Clock", SND_SOC_NOPM, 0, 0, @@ -607,6 +634,9 @@ static const struct snd_soc_dapm_route nau8821_dapm_routes[] = { {"AIFTX", NULL, "ADCL Digital path"}, {"AIFTX", NULL, "ADCR Digital path"},

+ {"AIFTX", NULL, "System Clock"}, + {"AIFRX", NULL, "System Clock"}, + {"DDACL", NULL, "AIFRX"}, {"DDACR", NULL, "AIFRX"},