Re: [PATCH v2 2/2] ASoC: qcom: sc7180: Add machine driver for sound card registration

diff --git a/sound/soc/qcom/sc7180.c b/sound/soc/qcom/sc7180.c
new file mode 100644
index 000000000000..3beb2b129d01
--- /dev/null
+++ b/sound/soc/qcom/sc7180.c

@@ -0,0 +1,380 @@
+// SPDX-License-Identifier: GPL-2.0-only
+//
+//Copyright (c) 2020, The Linux Foundation. All rights reserved.
+//
+//sc7180.c -- ALSA SoC Machine driver for SC7180

+static int sc7180_headset_init(struct snd_soc_component *component);
+
+static struct snd_soc_aux_dev sc7180_headset_dev = {
+       .dlc = COMP_EMPTY(),
+       .init = sc7180_headset_init,
+};

+static unsigned int primary_dai_fmt = SND_SOC_DAIFMT_CBS_CFS |
+                                     SND_SOC_DAIFMT_NB_NF |
+                                     SND_SOC_DAIFMT_I2S;
+
+static int sc7180_snd_startup(struct snd_pcm_substream *substream)
+{
+       struct snd_soc_pcm_runtime *rtd = substream->private_data;
+       struct snd_soc_card *card = rtd->card;
+       struct sc7180_snd_data *data = snd_soc_card_get_drvdata(card);
+       struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
+       struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0);
+       int ret;
+
+       switch (cpu_dai->id) {
+       case MI2S_PRIMARY:
+               if (++data->pri_mi2s_clk_count == 1) {
+                       snd_soc_dai_set_sysclk(cpu_dai,
+                                              LPASS_MCLK0,
+                                              DEFAULT_MCLK_RATE,
+                                              SNDRV_PCM_STREAM_PLAYBACK);
+               }
+               snd_soc_dai_set_fmt(codec_dai, primary_dai_fmt);

+static int sc7180_parse_of(struct snd_soc_card *card)
+{
+       struct device_node *np;
+       struct device_node *codec = NULL;
+       struct device_node *platform = NULL;

+       struct device_node *cpu = NULL;
+       struct device *dev = card->dev;
+       struct snd_soc_dai_link *link;
+       struct of_phandle_args args;
+       struct snd_soc_dai_link_component *dlc;
+       int ret, num_links;
+
+       ret = snd_soc_of_parse_card_name(card, "model");
+       if (ret) {
+               dev_err(dev, "Error parsing card name: %d\n", ret);
+               return ret;
+       }
+
+       /* DAPM routes */
+       if (of_property_read_bool(dev->of_node, "audio-routing")) {
+               ret = snd_soc_of_parse_audio_routing(card,
+                                                    "audio-routing");
+               if (ret)
+                       return ret;
+       }
+
+       /* headset aux dev. */
+       sc7180_headset_dev.dlc.of_node = of_parse_phandle(
+                       dev->of_node, "aux-dev", 0);
+       if (!sc7180_headset_dev.dlc.of_node) {
+               dev_err(dev,
+                       "Property 'aux-dev' missing/invalid\n");
+               return -EINVAL;
+       }
+
+       /* Populate links */
+       num_links = of_get_child_count(dev->of_node);

+
+       /* Allocate the DAI link array */
+       card->dai_link = devm_kcalloc(dev, num_links, sizeof(*link),
+                                     GFP_KERNEL);
+       if (!card->dai_link)
+               return -ENOMEM;
+
+       card->num_links = num_links;

+       for_each_child_of_node(dev->of_node, np) {
+               dlc = devm_kzalloc(dev, 2 * sizeof(*dlc), GFP_KERNEL);
+               if (!dlc)
+                       return -ENOMEM;
+
+               link->cpus      = &dlc[0];
+               link->platforms = &dlc[1];
+
+               link->num_cpus          = 1;
+               link->num_platforms     = 1;
+
+               ret = of_property_read_string(np, "link-name", &link->name);
+               if (ret) {
+                       dev_err(card->dev,
+                               "error getting codec dai_link name\n");
+                       goto err;
+               }
+
+               link->playback_only = of_property_read_bool(np,
+                                                           "playback_only");
+               link->capture_only = of_property_read_bool(np,
+                                                          "capture_only");
+
+               if (link->playback_only && link->capture_only) {
+                       dev_err(card->dev,
+                               "getting both playback and capture only\n");

+                       goto err;
+               }
+
+               cpu = of_get_child_by_name(np, "cpu");
+               codec = of_get_child_by_name(np, "codec");

+
+               if (!cpu) {
+                       dev_err(dev, "%s: Can't find cpu DT node\n",
+                               link->name);
+                       ret = -EINVAL;
+                       goto err;
+               }
+
+               ret = of_parse_phandle_with_args(cpu, "sound-dai",
+                                                "#sound-dai-cells", 0, &args);

+               if (ret) {
+                       dev_err(card->dev, "%s: error getting cpu phandle\n",
+                               link->name);
+                       goto err;
+               }
+               link->cpus->of_node = args.np;
+               link->id = args.args[0];

+
+               ret = snd_soc_of_get_dai_name(cpu, &link->cpus->dai_name);
+               if (ret) {
+                       dev_err(card->dev, "%s: error getting cpu dai name\n",
+                               link->name);
+                       goto err;
+               }
+

+               if (codec) {
+                       ret = snd_soc_of_get_dai_link_codecs(dev, codec, link);
+                       if (ret < 0) {
+                               dev_err(card->dev, "%s: codec dai not found\n",
+                                       link->name);
+                               goto err;
+                       }
+               } else {
+                       dlc = devm_kzalloc(dev, sizeof(*dlc), GFP_KERNEL);
+                       if (!dlc)
+                               return -ENOMEM;
+
+                       link->codecs     = dlc;
+                       link->num_codecs = 1;
+
+                       link->codecs->dai_name = "snd-soc-dummy-dai";
+                       link->codecs->name = "snd-soc-dummy";
+               }
+
+               link->platforms->of_node = link->cpus->of_node;
+               link->stream_name = link->name;
+               link->ops = &sc7180_ops;
+               link++;
+
+               of_node_put(cpu);
+               of_node_put(codec);

+       }
+
+       return 0;
+err:
+       of_node_put(np);

+       of_node_put(cpu);
+       of_node_put(codec);
+       of_node_put(platform);

+static int sc7180_snd_platform_probe(struct platform_device *pdev)
+{
+       struct snd_soc_card *card;
+       struct sc7180_snd_data *data;
+       struct device *dev = &pdev->dev;
+       int ret;
+
+       card = &sc7180_card;

+
+       /* Allocate the private data */
+       data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+       if (!data)
+               return -ENOMEM;
+
+       card->dapm_widgets = sc7180_snd_widgets;
+       card->num_dapm_widgets = ARRAY_SIZE(sc7180_snd_widgets);

+       ret = sc7180_parse_of(card);
+       if (ret) {
+               dev_err(dev, "Error parsing OF data\n");
+               return ret;
+       }
+
+       data->card = card;

+       snd_soc_card_set_drvdata(card, data);
+
+       ret = snd_soc_register_card(card);
+       if (ret) {
+               dev_err(dev, "Sound card registration failed\n");
+               return ret;
+       }
+       return ret;

+static int sc7180_snd_platform_remove(struct platform_device *pdev)
+{
+       struct snd_soc_card *card = dev_get_drvdata(&pdev->dev);
+
+       snd_soc_unregister_card(card);
+       return 0;
+}