有两种注册方式

1. snd_soc_add_controls注册

   1 2 3 4

   static const struct wm8960_snd_controls[] = { SOC_DOUBLE_R_TLV("Capture Volume", WM8960_LINVOL, WM8960_RINVOL, 0, 63, 0, adc_tlv), };

   1 2	snd_soc_add_controls(codec, wm8960_snd_controls, ARRAY_SIZE(wm8960_snd_controls));

2. 注册到widget中

   1 2 3 4 5

   static const struct wm8960_lin_boost[] = { SOC_DAPM_SINGLE("LINPUT2 Switch", WM8960_LINPATH, 6, 1, 0), SOC_DAPM_SINGLE("LINPUT3 Switch", WM8960_LINPATH, 7, 1, 0), SOC_DAPM_SINGLE("LINPUT1 Switch", WM8960_LINPATH, 8, 1, 0), };

   1 2 3 4

   static const struct snd_soc_dapm_widget wm8960_dapm_widgets[] = { SND_SOC_DAPM_MIXER("Left Boost Mixer", WM8960_POWER1, 5, 0, wm8960_lin_boost, ARRAY_SIZE(wm8960_lin_boost)), };

dapm中的最小unit

1
2
3
4

static const struct snd_soc_dapm_widget wm8960_dapm_widgets[] = {
	SND_SOC_DAPM_INPUT("LINPUT1"),
	...
};

描述各种widget，kcontrol之间的关系

1
2
3
4

static const struct snd_soc_dapm_route audio_paths[] = {
	{ "Left Boost Mixer", "LINPUT1 Switch", "LINPUT1" },
	...
};