sound/soc/msm/msm8952.c// 注册平台设备
static int __init msm8952_machine_init(void)
{return platform_driver_register(&msm8952_asoc_machine_driver);
}
late_initcall(msm8952_machine_init);// 驱动和设备的匹配表
static const struct of_device_id msm8952_asoc_machine_of_match[]  = {{ .compatible = "qcom,msm8952-audio-codec", },{},
};static struct platform_driver msm8952_asoc_machine_driver = {.driver = {.name = DRV_NAME,.owner = THIS_MODULE,.pm = &snd_soc_pm_ops,.of_match_table = msm8952_asoc_machine_of_match,},.probe = msm8952_asoc_machine_probe,.remove = msm8952_asoc_machine_remove,
};static int msm8952_asoc_machine_probe(struct platform_device *pdev)
{struct snd_soc_card *card;struct msm8916_asoc_mach_data *pdata = NULL;const char *hs_micbias_type = "qcom,msm-hs-micbias-type";const char *ext_pa = "qcom,msm-ext-pa";const char *mclk = "qcom,msm-mclk-freq";const char *wsa = "asoc-wsa-codec-names";const char *wsa_prefix = "asoc-wsa-codec-prefixes";const char *type = NULL;const char *ext_pa_str = NULL;const char *wsa_str = NULL;const char *wsa_prefix_str = NULL;int num_strings;int ret, id, i, val;struct resource *muxsel;char *temp_str = NULL;pdata = devm_kzalloc(&pdev->dev,sizeof(struct msm8916_asoc_mach_data), GFP_KERNEL);if (!pdata)return -ENOMEM;muxsel = platform_get_resource_byname(pdev, IORESOURCE_MEM,"csr_gp_io_mux_mic_ctl");if (!muxsel) {dev_err(&pdev->dev, "MUX addr invalid for MI2S\n");ret = -ENODEV;goto err1;}pdata->vaddr_gpio_mux_mic_ctl =ioremap(muxsel->start, resource_size(muxsel));if (pdata->vaddr_gpio_mux_mic_ctl == NULL) {pr_err("%s ioremap failure for muxsel virt addr\n",__func__);ret = -ENOMEM;goto err1;}muxsel = platform_get_resource_byname(pdev, IORESOURCE_MEM,"csr_gp_io_mux_spkr_ctl");if (!muxsel) {dev_err(&pdev->dev, "MUX addr invalid for MI2S\n");ret = -ENODEV;goto err;}pdata->vaddr_gpio_mux_spkr_ctl =ioremap(muxsel->start, resource_size(muxsel));if (pdata->vaddr_gpio_mux_spkr_ctl == NULL) {pr_err("%s ioremap failure for muxsel virt addr\n",__func__);ret = -ENOMEM;goto err;}muxsel = platform_get_resource_byname(pdev, IORESOURCE_MEM,"csr_gp_io_lpaif_pri_pcm_pri_mode_muxsel");if (!muxsel) {dev_err(&pdev->dev, "MUX addr invalid for MI2S\n");ret = -ENODEV;goto err;}pdata->vaddr_gpio_mux_pcm_ctl =ioremap(muxsel->start, resource_size(muxsel));if (pdata->vaddr_gpio_mux_pcm_ctl == NULL) {pr_err("%s ioremap failure for muxsel virt addr\n",__func__);ret = -ENOMEM;goto err;}muxsel = platform_get_resource_byname(pdev, IORESOURCE_MEM,"csr_gp_io_mux_quin_ctl");if (!muxsel) {dev_dbg(&pdev->dev, "MUX addr invalid for MI2S\n");goto parse_mclk_freq;}pdata->vaddr_gpio_mux_quin_ctl =ioremap(muxsel->start, resource_size(muxsel));if (pdata->vaddr_gpio_mux_quin_ctl == NULL) {pr_err("%s ioremap failure for muxsel virt addr\n",__func__);ret = -ENOMEM;goto err;}
parse_mclk_freq:// 获取时钟ret = of_property_read_u32(pdev->dev.of_node, mclk, &id);if (ret) {dev_err(&pdev->dev,"%s: missing %s in dt node\n", __func__, mclk);id = DEFAULT_MCLK_RATE;}pdata->mclk_freq = id;/*reading the gpio configurations from dtsi file*/ret = msm_gpioset_initialize(CLIENT_WCD_INT, &pdev->dev);if (ret < 0) {dev_err(&pdev->dev,"%s: error reading dtsi files%d\n", __func__, ret);goto err;}num_strings = of_property_count_strings(pdev->dev.of_node,wsa);if (num_strings > 0) {if (wsa881x_get_probing_count() < 2) {ret = -EPROBE_DEFER;goto err;} else if (wsa881x_get_presence_count() == num_strings) {bear_card.aux_dev = msm8952_aux_dev;bear_card.num_aux_devs = num_strings;bear_card.codec_conf = msm8952_codec_conf;bear_card.num_configs = num_strings;for (i = 0; i < num_strings; i++) {ret = of_property_read_string_index(pdev->dev.of_node, wsa,i, &wsa_str);if (ret) {dev_err(&pdev->dev,"%s:of read string %s i %d error %d\n",__func__, wsa, i, ret);goto err;}temp_str = kstrdup(wsa_str, GFP_KERNEL);if (!temp_str) {ret = -ENOMEM;goto err;}msm8952_aux_dev[i].codec_name = temp_str;temp_str = NULL;temp_str = kstrdup(wsa_str, GFP_KERNEL);if (!temp_str) {ret = -ENOMEM;goto err;}msm8952_codec_conf[i].dev_name = temp_str;temp_str = NULL;ret = of_property_read_string_index(pdev->dev.of_node, wsa_prefix,i, &wsa_prefix_str);if (ret) {dev_err(&pdev->dev,"%s:of read string %s i %d error %d\n",__func__, wsa_prefix, i, ret);goto err;}temp_str = kstrdup(wsa_prefix_str, GFP_KERNEL);if (!temp_str) {ret = -ENOMEM;goto err;}msm8952_codec_conf[i].name_prefix = temp_str;temp_str = NULL;}ret = msm8952_init_wsa_switch_supply(pdev, pdata);if (ret < 0) {pr_err("%s: failed to init wsa_switch vdd supply %d\n",__func__, ret);goto err;}wsa881x_set_mclk_callback(msm8952_enable_wsa_mclk);/* update the internal speaker boost usage */msm8x16_update_int_spk_boost(false);}}// 获取dai_linkscard = msm8952_populate_sndcard_dailinks(&pdev->dev);dev_info(&pdev->dev, "default codec configured\n");num_strings = of_property_count_strings(pdev->dev.of_node,ext_pa);if (num_strings < 0) {dev_err(&pdev->dev,"%s: missing %s in dt node or length is incorrect\n",__func__, ext_pa);goto err;}for (i = 0; i < num_strings; i++) {ret = of_property_read_string_index(pdev->dev.of_node,ext_pa, i, &ext_pa_str);if (ret) {dev_err(&pdev->dev, "%s:of read string %s i %d error %d\n",__func__, ext_pa, i, ret);goto err;}if (!strcmp(ext_pa_str, "primary"))pdata->ext_pa = (pdata->ext_pa | PRI_MI2S_ID);else if (!strcmp(ext_pa_str, "secondary"))pdata->ext_pa = (pdata->ext_pa | SEC_MI2S_ID);else if (!strcmp(ext_pa_str, "tertiary"))pdata->ext_pa = (pdata->ext_pa | TER_MI2S_ID);else if (!strcmp(ext_pa_str, "quaternary"))pdata->ext_pa = (pdata->ext_pa | QUAT_MI2S_ID);else if (!strcmp(ext_pa_str, "quinary"))pdata->ext_pa = (pdata->ext_pa | QUIN_MI2S_ID);}pr_debug("%s: ext_pa = %d\n", __func__, pdata->ext_pa);ret = is_us_eu_switch_gpio_support(pdev, pdata);if (ret < 0) {pr_err("%s: failed to is_us_eu_switch_gpio_support %d\n",__func__, ret);goto err;}ret = is_ext_spk_gpio_support(pdev, pdata);if (ret < 0)pr_err("%s:  doesn't support external speaker pa\n",__func__);get_dev_by_boardid(model_name);if(0 == strcmp(model_name,"eda71")){enable_aw8738 = of_property_read_bool(pdev->dev.of_node , "action,enable-aw8738");if(enable_aw8738){gpio_request(pdata->spk_ext_pa_gpio, "AW8738_EN");gpio_direction_output(pdata->spk_ext_pa_gpio,0);}}//printk("enable_aw8738:%d model_name:%s.\n",enable_aw8738,model_name);// 查看micbias类型ret = of_property_read_string(pdev->dev.of_node,hs_micbias_type, &type);if (ret) {dev_err(&pdev->dev, "%s: missing %s in dt node\n",__func__, hs_micbias_type);goto err;}// 使用内部还是外部的micbiasif (!strcmp(type, "external")) {dev_dbg(&pdev->dev, "Headset is using external micbias\n");mbhc_cfg.hs_ext_micbias = true;} else {dev_dbg(&pdev->dev, "Headset is using internal micbias\n");mbhc_cfg.hs_ext_micbias = false;}ret = of_property_read_u32(pdev->dev.of_node,"qcom,msm-afe-clk-ver", &val);if (ret)pdata->afe_clk_ver = AFE_CLK_VERSION_V2;elsepdata->afe_clk_ver = val;/* initialize the mclk */pdata->digital_cdc_clk.i2s_cfg_minor_version =AFE_API_VERSION_I2S_CONFIG;pdata->digital_cdc_clk.clk_val = pdata->mclk_freq;pdata->digital_cdc_clk.clk_root = 5;pdata->digital_cdc_clk.reserved = 0;/* initialize the digital codec core clk */pdata->digital_cdc_core_clk.clk_set_minor_version =AFE_API_VERSION_I2S_CONFIG;pdata->digital_cdc_core_clk.clk_id =Q6AFE_LPASS_CLK_ID_INTERNAL_DIGITAL_CODEC_CORE;pdata->digital_cdc_core_clk.clk_freq_in_hz =pdata->mclk_freq;pdata->digital_cdc_core_clk.clk_attri =Q6AFE_LPASS_CLK_ATTRIBUTE_COUPLE_NO;pdata->digital_cdc_core_clk.clk_root =Q6AFE_LPASS_CLK_ROOT_DEFAULT;pdata->digital_cdc_core_clk.enable = 1;/* Initialize loopback mode to false */pdata->lb_mode = false;msm8952_dt_parse_cap_info(pdev, pdata);card->dev = &pdev->dev;platform_set_drvdata(pdev, card);snd_soc_card_set_drvdata(card, pdata);// 解析设备数中声卡的名称, qcom,model = "msm8953-snd-card-mtp";ret = snd_soc_of_parse_card_name(card, "qcom,model");if (ret)goto err;/* initialize timer */INIT_DELAYED_WORK(&pdata->disable_mclk_work, msm8952_disable_mclk);mutex_init(&pdata->cdc_mclk_mutex);atomic_set(&pdata->mclk_rsc_ref, 0);if (card->aux_dev) {mutex_init(&pdata->wsa_mclk_mutex);atomic_set(&pdata->wsa_mclk_rsc_ref, 0);}atomic_set(&pdata->mclk_enabled, false);atomic_set(&quat_mi2s_clk_ref, 0);atomic_set(&quin_mi2s_clk_ref, 0);atomic_set(&auxpcm_mi2s_clk_ref, 0);// 声卡的routingret = snd_soc_of_parse_audio_routing(card,"qcom,audio-routing");if (ret)goto err;ret = msm8952_populate_dai_link_component_of_node(card);if (ret) {ret = -EPROBE_DEFER;goto err;}// 注册声卡ret = snd_soc_register_card(card);if (ret) {dev_err(&pdev->dev, "snd_soc_register_card failed (%d)\n",ret);goto err;}return 0;
err:if (pdata->vaddr_gpio_mux_spkr_ctl)iounmap(pdata->vaddr_gpio_mux_spkr_ctl);if (pdata->vaddr_gpio_mux_mic_ctl)iounmap(pdata->vaddr_gpio_mux_mic_ctl);if (pdata->vaddr_gpio_mux_pcm_ctl)iounmap(pdata->vaddr_gpio_mux_pcm_ctl);if (pdata->vaddr_gpio_mux_quin_ctl)iounmap(pdata->vaddr_gpio_mux_quin_ctl);if (bear_card.num_aux_devs > 0) {for (i = 0; i < bear_card.num_aux_devs; i++) {kfree(msm8952_aux_dev[i].codec_name);kfree(msm8952_codec_conf[i].dev_name);kfree(msm8952_codec_conf[i].name_prefix);}}
err1:devm_kfree(&pdev->dev, pdata);return ret;
}static struct snd_soc_card *msm8952_populate_sndcard_dailinks(struct device *dev)
{struct snd_soc_card *card = &bear_card;struct snd_soc_dai_link *dailink;int len1;card->name = dev_name(dev);len1 = ARRAY_SIZE(msm8952_dai);// dai_links复制给snd_soc_card, 注册的时候会用到memcpy(msm8952_dai_links, msm8952_dai, sizeof(msm8952_dai));dailink = msm8952_dai_links;if (of_property_read_bool(dev->of_node,"qcom,hdmi-dba-codec-rx")) {dev_dbg(dev, "%s(): hdmi audio support present\n",__func__);memcpy(dailink + len1, msm8952_hdmi_dba_dai_link,sizeof(msm8952_hdmi_dba_dai_link));len1 += ARRAY_SIZE(msm8952_hdmi_dba_dai_link);} else {dev_dbg(dev, "%s(): No hdmi dba present, add quin dai\n",__func__);memcpy(dailink + len1, msm8952_quin_dai_link,sizeof(msm8952_quin_dai_link));len1 += ARRAY_SIZE(msm8952_quin_dai_link);}if (of_property_read_bool(dev->of_node,"qcom,split-a2dp")) {dev_dbg(dev, "%s(): split a2dp support present\n",__func__);memcpy(dailink + len1, msm8952_split_a2dp_dai_link,sizeof(msm8952_split_a2dp_dai_link));len1 += ARRAY_SIZE(msm8952_split_a2dp_dai_link);}card->dai_link = dailink;card->num_links = len1;return card;
}// machine驱动会用这些参数去匹配platform,codec,adi.
// 都是在platform，codec中定义
/* Digital audio interface glue - connects codec <---> CPU */
static struct snd_soc_dai_link msm8952_dai[] = {/* FrontEnd DAI Links */{/* hw:x,0 */.name = "MSM8952 Media1",       // Media1 播放链路.stream_name = "MultiMedia1",   // 匹配pcm id.cpu_dai_name   = "MultiMedia1",    // 匹配cpu dai driver.platform_name  = "msm-pcm-dsp.0",  // 匹配platform driver.dynamic = 1,.async_ops = ASYNC_DPCM_SND_SOC_PREPARE,.dpcm_playback = 1,.dpcm_capture = 1,.trigger = {SND_SOC_DPCM_TRIGGER_POST,SND_SOC_DPCM_TRIGGER_POST},.codec_dai_name = "snd-soc-dummy-dai",  // 匹配codec dai driver.codec_name = "snd-soc-dummy",  // 匹配codec driver.ignore_suspend = 1,/* this dainlink has playback support */.ignore_pmdown_time = 1,.be_id = MSM_FRONTEND_DAI_MULTIMEDIA1},{/* hw:x,1 */.name = "MSM8952 Media2",       // Media2播放链路.stream_name = "MultiMedia2",.cpu_dai_name   = "MultiMedia2",.platform_name  = "msm-pcm-dsp.0",.dynamic = 1,.dpcm_playback = 1,.dpcm_capture = 1,.codec_dai_name = "snd-soc-dummy-dai",.codec_name = "snd-soc-dummy",.trigger = {SND_SOC_DPCM_TRIGGER_POST,SND_SOC_DPCM_TRIGGER_POST},.ignore_suspend = 1,/* this dainlink has playback support */.ignore_pmdown_time = 1,.be_id = MSM_FRONTEND_DAI_MULTIMEDIA2,},{/* hw:x,2 */.name = "Circuit-Switch Voice",.stream_name = "CS-Voice",.cpu_dai_name   = "CS-VOICE",.platform_name  = "msm-pcm-voice",.dynamic = 1,.dpcm_playback = 1,.dpcm_capture = 1,.trigger = {SND_SOC_DPCM_TRIGGER_POST,SND_SOC_DPCM_TRIGGER_POST},.no_host_mode = SND_SOC_DAI_LINK_NO_HOST,.ignore_suspend = 1,/* this dainlink has playback support */.ignore_pmdown_time = 1,.be_id = MSM_FRONTEND_DAI_CS_VOICE,.codec_dai_name = "snd-soc-dummy-dai",.codec_name = "snd-soc-dummy",},...
}