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 mappingof SDIx to PATHx. By default, they are one-to-one mapping as follows:path0 <-- sdi0path1 <-- sdi1path2 <-- sdi2path3 <-- sdi3e.g. "rockchip,path-map = <3 2 1 0>" means the mapping as follows:path0 <-- sdi3path1 <-- sdi2path2 <-- sdi1path3 <-- 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-codecrockchip,rk817-codec1 [rockchipEs7202 ]: rockchip_Es7202 - rockchip,Es7202rockchip,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-codecrockchip,rk817-codec1 [rockchipsoundes]: rockchip_sound_ - rockchip,sound_es7202rockchip,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_96000static 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_96000static struct snd_soc_dai_ops es7202_ops = {//.digital_mute = es7202_mute,.mute_stream = es7202_mute_stream,
};

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