IMX6基于yocto3.14.28移植声卡wm8960

项目需求，在基于yocto Linux3.14.28的IMX6平台下移植wm8960声卡。硬件部分如下：

声卡驱动在内核代码的sound/soc/codec，和sound/soc/fsl目录下。原代码中在sound/soc/codec下面有wm8960.c，wm8960.h文件，但sound/soc/fsl目录下没有imx-wm8960.c，只有默认的imx-wm8962.c，尝试根据imx-wm8962.c修改新建一个wm8960的machine驱动，经过调试可以识别到声卡，但是无法输出声音，I2S测量没有波形输出。最终以失败告终，感觉wm8960和wm8962的差距还是比较大。

最终参考Linux3.14.52的代码解决，具体修改如下：

1，在http://git.freescale.com/git/cgit.cgi/imx/linux-2.6-imx.git/tree/sound/soc/fsl?h=imx_3.14.52_1.1.0_ga中下载sound/soc/codec/wm8960.c，sound/soc/codec/wm8960.h，sound/soc/fsl/imx-wm8960.c到对应目录，并修改Makefile和Kconfig将其加入内核编译。

2，由于默认imx-wm8960.c采用sai总线，而我的硬件采用ssi总线与之连接，因此需要修改dts文件，修改arch/arm/boot/dts/imx6qdl-sabresd.dtsi如下：

        sound {compatible = "fsl,imx6q-sabresd-wm8960","fsl,imx-audio-wm8960";model = "wm8960-audio";cpu-dai = <&ssi2>;audio-codec = <&codec>;codec-master;audio-routing ="Headset Jack", "HP_L","Headset Jack", "HP_R","Ext Spk", "SPK_RP","Ext Spk", "SPK_RN","Ext Spk", "SPK_LP","Ext Spk", "SPK_LN","LINPUT1", "Main MIC"/*,"IN3R", "MICBIAS","DMIC", "MICBIAS","DMICDAT", "DMIC" */;/*mux-int-port = <2>;*/mux-int-port = <2>;mux-ext-port = <3>;hp-det-gpios = <&gpio7 8 0>;mic-det-gpios = <&gpio1 9 0>;};......&ssi2 {fsl,mode = "i2s-slave";status = "okay";};......codec: wm8960@1a {compatible = "wlf,wm8960";reg = <0x1a>;clocks = <&clks IMX6QDL_CLK_CKO>;clock-names = "mclk";DCVDD-supply = <&reg_audio>;DBVDD-supply = <&reg_audio>;AVDD-supply = <&reg_audio>;CPVDD-supply = <&reg_audio>;MICVDD-supply = <&reg_audio>;PLLVDD-supply = <&reg_audio>;SPKVDD1-supply = <&reg_audio>;SPKVDD2-supply = <&reg_audio>;amic-mono;wlf,shared-lrclk;};

3，修改之后启动可以识别到声卡，但是无法输出声音，用示波器测量I2S总线只有时钟正常，其他信号幅值偏低，这是由于在声卡驱动中没有配置imx6的audmux的原因，另外还有一个原因是在probe_last里面要增加对wm8960的寄存求配置，否则默认无输出，修改sound/soc/fsl/imx-wm8960.c如下：

//在probe函数中增加audmux配置
static int imx_wm8960_probe(struct platform_device *pdev)
{struct device_node *cpu_np, *codec_np, *gpr_np;struct platform_device *cpu_pdev;struct imx_priv *priv = &card_priv;struct i2c_client *codec_dev;struct imx_wm8960_data *data;struct platform_device *asrc_pdev = NULL;struct device_node *asrc_np;u32 width;int ret;struct device_node *np = pdev->dev.of_node;int int_port, ext_port;priv->pdev = pdev; cpu_np = of_parse_phandle(pdev->dev.of_node, "cpu-dai", 0);if (!cpu_np) {dev_err(&pdev->dev, "cpu dai phandle missing or invalid\n");ret = -EINVAL;goto fail;}#if 1  //增加audmux部分if (!strstr(cpu_np->name, "ssi"))goto audmux_bypass;ret = of_property_read_u32(np, "mux-int-port", &int_port);if (ret) {dev_err(&pdev->dev, "mux-int-port missing or invalid\n");return ret;}ret = of_property_read_u32(np, "mux-ext-port", &ext_port);if (ret) {dev_err(&pdev->dev, "mux-ext-port missing or invalid\n");return ret;}/** The port numbering in the hardware manual starts at 1, while* the audmux API expects it starts at 0.*/int_port--;ext_port--;dev_err(&pdev->dev, "audmix int-port:%d,ext-port%d\n",int_port,ext_port);ret = imx_audmux_v2_configure_port(int_port,IMX_AUDMUX_V2_PTCR_SYN |IMX_AUDMUX_V2_PTCR_TFSEL(ext_port) |IMX_AUDMUX_V2_PTCR_TCSEL(ext_port) |IMX_AUDMUX_V2_PTCR_TFSDIR |IMX_AUDMUX_V2_PTCR_TCLKDIR,IMX_AUDMUX_V2_PDCR_RXDSEL(ext_port));if (ret) {dev_err(&pdev->dev, "audmux internal port setup failed\n");return ret;}imx_audmux_v2_configure_port(ext_port,IMX_AUDMUX_V2_PTCR_SYN,IMX_AUDMUX_V2_PDCR_RXDSEL(int_port));if (ret) {dev_err(&pdev->dev, "audmux external port setup failed\n");return ret;}audmux_bypass:#endifcodec_np = of_parse_phandle(pdev->dev.of_node, "audio-codec", 0);if (!codec_np) {dev_err(&pdev->dev, "phandle missing or invalid\n");ret = -EINVAL;goto fail;}cpu_pdev = of_find_device_by_node(cpu_np);if (!cpu_pdev) {dev_err(&pdev->dev, "failed to find SAI platform device\n");ret = -EINVAL;goto fail;}codec_dev = of_find_i2c_device_by_node(codec_np);if (!codec_dev || !codec_dev->dev.driver) {dev_err(&pdev->dev, "failed to find codec platform device\n");ret = -EINVAL;goto fail;}data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);if (!data) {ret = -ENOMEM;goto fail;}if (of_property_read_bool(pdev->dev.of_node, "codec-master"))data->is_codec_master = true;data->codec_clk = devm_clk_get(&codec_dev->dev, "mclk");if (IS_ERR(data->codec_clk)) {ret = PTR_ERR(data->codec_clk);dev_err(&pdev->dev, "failed to get codec clk: %d\n", ret);goto fail;}gpr_np = of_parse_phandle(pdev->dev.of_node, "gpr", 0);if (gpr_np) {data->gpr = syscon_node_to_regmap(gpr_np);if (IS_ERR(data->gpr)) {ret = PTR_ERR(data->gpr);dev_err(&pdev->dev, "failed to get gpr regmap\n");goto fail;}}of_property_read_u32_array(pdev->dev.of_node, "hp-det", data->hp_det, 2);asrc_np = of_parse_phandle(pdev->dev.of_node, "asrc-controller", 0);if (asrc_np) {asrc_pdev = of_find_device_by_node(asrc_np);priv->asrc_pdev = asrc_pdev;}data->card.dai_link = imx_wm8960_dai;imx_wm8960_dai[0].codec_of_node  = codec_np;imx_wm8960_dai[0].cpu_dai_name = dev_name(&cpu_pdev->dev);imx_wm8960_dai[0].platform_of_node = cpu_np;if (!asrc_pdev) {data->card.num_links = 1;} else {imx_wm8960_dai[1].cpu_of_node = asrc_np;imx_wm8960_dai[1].platform_of_node = asrc_np;imx_wm8960_dai[2].codec_of_node = codec_np;imx_wm8960_dai[2].cpu_dai_name = dev_name(&cpu_pdev->dev);data->card.num_links = 3;ret = of_property_read_u32(asrc_np, "fsl,asrc-rate",&data->asrc_rate);if (ret) {dev_err(&pdev->dev, "failed to get output rate\n");ret = -EINVAL;goto fail;}ret = of_property_read_u32(asrc_np, "fsl,asrc-width", &width);if (ret) {dev_err(&pdev->dev, "failed to get output rate\n");ret = -EINVAL;goto fail;}if (width == 24)data->asrc_format = SNDRV_PCM_FORMAT_S24_LE;elsedata->asrc_format = SNDRV_PCM_FORMAT_S16_LE;}data->card.dev = &pdev->dev;ret = snd_soc_of_parse_card_name(&data->card, "model");if (ret)goto fail;data->card.dapm_widgets = imx_wm8960_dapm_widgets;data->card.num_dapm_widgets = ARRAY_SIZE(imx_wm8960_dapm_widgets);ret = snd_soc_of_parse_audio_routing(&data->card, "audio-routing");if (ret)goto fail;data->card.late_probe = imx_wm8960_late_probe;platform_set_drvdata(pdev, &data->card);snd_soc_card_set_drvdata(&data->card, data);ret = devm_snd_soc_register_card(&pdev->dev, &data->card);if (ret) {dev_err(&pdev->dev, "snd_soc_register_card failed (%d)\n", ret);goto fail;}priv->snd_card = data->card.snd_card;priv->hp_set_gpio = of_get_named_gpio_flags(pdev->dev.of_node, "hp-det-gpios", 0,(enum of_gpio_flags *)&priv->hp_active_low);if (IS_ERR(ERR_PTR(priv->hp_set_gpio)))goto fail;priv->headset_kctl = snd_kctl_jack_new("Headset", 0, NULL);ret = snd_ctl_add(data->card.snd_card, priv->headset_kctl);if (ret)goto fail;ret = imx_wm8960_gpio_init(&data->card);if (gpio_is_valid(priv->hp_set_gpio)) {ret = driver_create_file(pdev->dev.driver, &driver_attr_headphone);if (ret) {dev_err(&pdev->dev, "create hp attr failed (%d)\n", ret);goto fail;}ret = driver_create_file(pdev->dev.driver, &driver_attr_micphone);if (ret) {dev_err(&pdev->dev, "create mic attr failed (%d)\n", ret);goto fail;}}
fail:if (cpu_np)of_node_put(cpu_np);if (codec_np)of_node_put(codec_np);return ret;
}//在wm8960_init函数中增加wm8960的寄存器配置
static void wm8960_init(struct snd_soc_dai *codec_dai)
{struct snd_soc_codec *codec = codec_dai->codec;struct snd_soc_card *card = codec_dai->card;struct imx_wm8960_data *data = snd_soc_card_get_drvdata(card);/** codec ADCLRC pin configured as GPIO, DACLRC pin is used as a frame* clock for ADCs and DACs*/snd_soc_update_bits(codec, WM8960_IFACE2, 1<<6, 1<<6);/** GPIO1 used as headphone detect output*/snd_soc_update_bits(codec, WM8960_ADDCTL4, 7<<4, 3<<4);/** Enable headphone jack detect*/snd_soc_update_bits(codec, WM8960_ADDCTL2, 1<<6, 1<<6);snd_soc_update_bits(codec, WM8960_ADDCTL2, 1<<5, data->hp_det[1]<<5);snd_soc_update_bits(codec, WM8960_ADDCTL4, 3<<2, data->hp_det[0]<<2);snd_soc_update_bits(codec, WM8960_ADDCTL1, 3, 3);/** route left channel to right channel in default.*/snd_soc_update_bits(codec, WM8960_ADDCTL1, 3<<2, 1<<2);snd_soc_write(codec,0x0 ,0x13f);snd_soc_write(codec,0x1 , 0x13f);snd_soc_write(codec,0x2 , 0x165);snd_soc_write(codec,0x3 , 0x165);snd_soc_write(codec, 0x4 , 0x5);snd_soc_write(codec,0x5 , 0x0);snd_soc_write(codec,0x6 ,0x0);snd_soc_write(codec,0x7 , 0x42);snd_soc_write(codec, 0x8 , 0x1c4);snd_soc_write(codec,0x9 , 0x0);snd_soc_write(codec,0xa , 0xd6);snd_soc_write(codec,0xb , 0xd6);snd_soc_write(codec,0x10 , 0x0);snd_soc_write(codec,0x11 , 0x7b);snd_soc_write(codec, 0x12 , 0x100);snd_soc_write(codec,0x13 , 0x32);snd_soc_write(codec,0x14 , 0x0);snd_soc_write(codec,0x15 , 0xc3);snd_soc_write(codec,0x16 , 0xc3);snd_soc_write(codec,0x17 , 0x1c0);snd_soc_write(codec,0x18 , 0x0);snd_soc_write(codec,0x19 , 0xfc);snd_soc_write(codec,0x1a , 0x1fb);snd_soc_write(codec,0x1b , 0x0);snd_soc_write(codec,0x1c , 0x8);snd_soc_write(codec,0x1d , 0x0);snd_soc_write(codec,0x20 , 0x108);snd_soc_write(codec,0x21 , 0x108);snd_soc_write(codec,0x22 , 0x100);snd_soc_write(codec,0x25 , 0x100);snd_soc_write(codec,0x26 , 0x0);snd_soc_write(codec,0x27 , 0x0);snd_soc_write(codec,0x28 , 0x165);snd_soc_write(codec,0x29 , 0x165);snd_soc_write(codec,0x2a , 0x40);snd_soc_write(codec,0x2b , 0x0);snd_soc_write(codec,0x2c , 0x0);snd_soc_write(codec,0x2d , 0x50);snd_soc_write(codec,0x2e , 0x50);snd_soc_write(codec,0x2f , 0x3c);snd_soc_write(codec,0x30 , 0x2);snd_soc_write(codec,0x31 , 0xf7);snd_soc_write(codec,0x33 , 0x9b);snd_soc_write(codec,0x34 , 0x37);snd_soc_write(codec,0x35 , 0x86);snd_soc_write(codec,0x36 , 0xc2);snd_soc_write(codec,0x37 , 0x27);
}

经过如上修改后，执行aplay 1.wav测试声卡正常工作。

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