ASoC: nau8825: add clock management for power saving

Adjust dapm widget to manage clock from power event for power saving.

Signed-off-by: David Lin <CTLIN0@nuvoton.com>
Signed-off-by: Mac Chiang <mac.chiang@intel.com>
Link: https://lore.kernel.org/r/20211025113857.3860951-3-CTLIN0@nuvoton.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/codecs/nau8825.c b/sound/soc/codecs/nau8825.c
index e7a6bd9..7734bc3 100644 (file)
--- a/sound/soc/codecs/nau8825.c
+++ b/sound/soc/codecs/nau8825.c
@@ -47,6 +47,7 @@
 
 static int nau8825_configure_sysclk(struct nau8825 *nau8825,
                int clk_id, unsigned int freq);
+static bool nau8825_is_jack_inserted(struct regmap *regmap);
 
 struct nau8825_fll {
        int mclk_src;
@@ -981,6 +982,31 @@ static int nau8825_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 nau8825 *nau8825 = snd_soc_component_get_drvdata(component);
+       struct regmap *regmap = nau8825->regmap;
+
+       if (SND_SOC_DAPM_EVENT_OFF(event)) {
+               dev_dbg(nau8825->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 (nau8825_is_jack_inserted(regmap)) {
+                       nau8825_configure_sysclk(nau8825,
+                                                NAU8825_CLK_INTERNAL, 0);
+               } else {
+                       nau8825_configure_sysclk(nau8825, NAU8825_CLK_DIS, 0);
+               }
+       }
+
+       return 0;
+}
+
 static int nau8825_biq_coeff_get(struct snd_kcontrol *kcontrol,
                                     struct snd_ctl_elem_value *ucontrol)
 {
@@ -1094,6 +1120,9 @@ static const struct snd_kcontrol_new nau8825_dacr_mux =
 static const struct snd_soc_dapm_widget nau8825_dapm_widgets[] = {
        SND_SOC_DAPM_AIF_OUT("AIFTX", "Capture", 0, NAU8825_REG_I2S_PCM_CTRL2,
                15, 1),
+       SND_SOC_DAPM_AIF_IN("AIFRX", "Playback", 0, SND_SOC_NOPM, 0, 0),
+       SND_SOC_DAPM_SUPPLY("System Clock", SND_SOC_NOPM, 0, 0,
+                           system_clock_control, SND_SOC_DAPM_POST_PMD),
 
        SND_SOC_DAPM_INPUT("MIC"),
        SND_SOC_DAPM_MICBIAS("MICBIAS", NAU8825_REG_MIC_BIAS, 8, 0),
@@ -1182,9 +1211,11 @@ static const struct snd_soc_dapm_route nau8825_dapm_routes[] = {
        {"ADC", NULL, "ADC Clock"},
        {"ADC", NULL, "ADC Power"},
        {"AIFTX", NULL, "ADC"},
+       {"AIFTX", NULL, "System Clock"},
 
-       {"DDACL", NULL, "Playback"},
-       {"DDACR", NULL, "Playback"},
+       {"AIFRX", NULL, "System Clock"},
+       {"DDACL", NULL, "AIFRX"},
+       {"DDACR", NULL, "AIFRX"},
        {"DDACL", NULL, "DDAC Clock"},
        {"DDACR", NULL, "DDAC Clock"},
        {"DACL Mux", "DACL", "DDACL"},