RK3566,ES7202声卡驱动添加

1. IIC驱动添加

设备树添加es7202的节点，内容如下

&i2c3 {
	status = "okay";
	clock-frequency = <400000>;

	es7202: es7202@37 {
		status = "okay";
		compatible = "ES7202_PDM_ADC_1";
		#sound-dai-cells = <0>;
		reg = <0x37>;
	};
};

2.添加声卡驱动

在设备树下添加声卡节点

	sound_es7202 {
		status = "okay";
		compatible = "simple-audio-card";

		simple-audio-card,format = "pdm";
		simple-audio-card,name = "rockchip,Es7202";
		simple-audio-card,mclk-fs = <256>;

		simple-audio-card,cpu {
			sound-dai = <&pdm>;
		};
		simple-audio-card,codec {
			sound-dai = <&es7202>;
		};

	};

3. pdm接口

设备树

&pdm {
	status = "okay";
	rockchip,path-map = <1 0 2 3>;
	clocks = <&cru MCLK_PDM>, <&cru HCLK_PDM>;
	clock-names = "pdm_clk", "pdm_hclk";
	pinctrl-names = "default";
	pinctrl-0 = <&pdmm0_clk1
			&pdmm0_sdi1>;
	//#sound-dai-cells = <0>;
};

这其中rockchip,path-map含义如下：

Optional properties:
- rockchip,path-map: This is a variable length array, that shows the mapping
  of SDIx to PATHx. By default, they are one-to-one mapping as follows:

   path0 <-- sdi0
   path1 <-- sdi1
   path2 <-- sdi2
   path3 <-- sdi3

  e.g. "rockchip,path-map = <3 2 1 0>" means the mapping as follows:

   path0 <-- sdi3
   path1 <-- sdi2
   path2 <-- sdi1
   path3 <-- sdi0

4.修改安卓hal层

在hardware/rockchip/audio/tinyalsa_hal/下的audio_hw.c,修改内容：

struct dev_proc_info MIC_IN_NAME[] =
  {
      {"realtekrt5616c", NULL,},                                                                                                                                          
      {"realtekrt5651co", "rt5651-aif1",},
      {"realtekrt5670c", NULL,},
      {"realtekrt5672c", NULL,},
      {"realtekrt5678co", NULL,},
      {"rockchipes8316c", NULL,},
      {"rockchipes8323c", NULL,},
      {"rockchipes8396c", NULL,},
      {"rockchipes7210", NULL,},
      {"rockchipes7243", NULL,},
      {"rockchiprk", NULL, },
      {"rockchiprk809co", NULL,},
      {"rockchiprk817co", NULL,},
      {"rockchiprt5640c", NULL,},
 	{"rockchiprt5670c", NULL,},
      {"rockchiprt5672c", NULL,},
      {"rockchipEs7202",NULL},    // es7202
      {NULL, NULL}, /* Note! Must end with NULL, else will cause crash */
  };

我的es7202的声卡名是"rockchipEs7202",依葫芦画瓢，复制一下上面的内容更改以下就可以了，

rk66_gnrc:/ $ cat proc/asound/cards                                                                                                                                         
 0 [rockchiprk817co]: rockchip_rk817- - rockchip,rk817-codec
                      rockchip,rk817-codec
 1 [rockchipEs7202 ]: rockchip_Es7202 - rockchip,Es7202
                      rockchip,Es7202
rk66_gnrc:/ $ 

这个名字是通过在adb终端cat查看的,我之前有加后缀太长发现不行，这个名字跟simple-audio-card,name = “rockchip,Es7202”;，有关我之前是：simple-audio-card,name = “rockchip,sound_es7202”; ,下面是我之前cat出来的信息：

rk66_gnrc:/ $ cat proc/asound/cards                                                                                                                                         
 0 [rockchiprk817co]: rockchip_rk817- - rockchip,rk817-codec
                      rockchip,rk817-codec
 1 [rockchipsoundes]: rockchip_sound_ - rockchip,sound_es7202
                      rockchip,sound_es7202

5.修改 es7202.c源码

将上面的添加好后发现用安卓里的录音APP录音没有反应，最后通过好几天的查找是es7202.c源码里有问题，内容如下

static int es7202_mute(struct snd_soc_dai *dai, int mute)
{
	if (mute) {
		es7202_multi_chips_update_bits(ES7202_PDM_INF_CTL_REG07, 0x03,0x03);
	} else if (dai->playback_active) {
		es7202_multi_chips_update_bits(ES7202_PDM_INF_CTL_REG07, 0x03,0x00);		
	}
	return 0;
}

#define es7202_RATES SNDRV_PCM_RATE_8000_96000

static struct snd_soc_dai_ops es7202_ops = {
	.digital_mute = es7202_mute,
};

更改如下：

static int es7202_mute_stream(struct snd_soc_dai *dai, int mute, int stream)
{
	printk("Vantron-------es7202_mute_stream------------------------\r\n");
 if (stream == SNDRV_PCM_STREAM_CAPTURE) {
               if (mute) {
                       es7202_multi_chips_update_bits(ES7202_PDM_INF_CTL_REG07, 0x03,0x03);
               } else {
                       msleep(150);
                       es7202_multi_chips_update_bits(ES7202_PDM_INF_CTL_REG07, 0x03,0x00);
               }
        }

	return 0;
}

#define es7202_RATES SNDRV_PCM_RATE_8000_96000

static struct snd_soc_dai_ops es7202_ops = {
	//.digital_mute = es7202_mute,
	.mute_stream = es7202_mute_stream,
};