Re: [PATCH v7 23/24] ASoC: qcom: apq8096: Add db820c machine driver

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On 5/1/2018 5:08 AM, Srinivas Kandagatla wrote:
This patch adds support to DB820c machine driver.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@xxxxxxxxxx>
---
  sound/soc/qcom/Kconfig   |   9 ++
  sound/soc/qcom/Makefile  |   2 +
  sound/soc/qcom/apq8096.c | 238 +++++++++++++++++++++++++++++++++++++++++++++++
  3 files changed, 249 insertions(+)
  create mode 100644 sound/soc/qcom/apq8096.c
<snip>

+
+static int apq8096_sbc_parse_of(struct snd_soc_card *card)
+{
+	struct device_node *np, *codec, *platform, *cpu, *node;
+	struct device *dev = card->dev;
+	struct snd_soc_dai_link *link;
+	int ret, num_links;
+
+	ret = snd_soc_of_parse_card_name(card, "qcom,model");
+	if (ret) {
+		dev_err(dev, "Error parsing card name: %d\n", ret);
+		return ret;
+	}
+
+	node = dev->of_node;
+
+	/* DAPM routes */
+	if (of_property_read_bool(node, "qcom,audio-routing")) {
+		ret = snd_soc_of_parse_audio_routing(card,
+					"qcom,audio-routing");
+		if (ret)
+			return ret;
+	}
+
+	/* Populate links */
+	num_links = of_get_child_count(node);
+
+	/* Allocate the DAI link array */
+	card->dai_link = kcalloc(num_links, sizeof(*link), GFP_KERNEL);
+	if (!card->dai_link)
+		return -ENOMEM;
+
+	card->num_links	= num_links;
+	link = card->dai_link;
+
+	for_each_child_of_node(node, np) {
+		cpu = of_get_child_by_name(np, "cpu");
+		platform = of_get_child_by_name(np, "platform");
+		codec = of_get_child_by_name(np, "codec");
+
+		if (!cpu) {
+			dev_err(dev, "Can't find cpu DT node\n");
clean up missing to kfree(card->dai_link)?

+			return -EINVAL;
+		}
+
+		link->cpu_of_node = of_parse_phandle(cpu, "sound-dai", 0);
+		if (!link->cpu_of_node) {
+			dev_err(card->dev, "error getting cpu phandle\n");
ditto

+			return -EINVAL;
+		}
+
+		ret = snd_soc_of_get_dai_name(cpu, &link->cpu_dai_name);
+		if (ret) {
+			dev_err(card->dev, "error getting cpu dai name\n");
ditto

+			return ret;
+		}
+
+		if (codec && platform) {
+			link->platform_of_node = of_parse_phandle(platform,
+								  "sound-dai",
+								   0);
+			if (!link->platform_of_node) {
+				dev_err(card->dev, "platform dai not found\n");
ditto

+				return -EINVAL;
+			}
+
+			ret = snd_soc_of_get_dai_link_codecs(dev, codec, link);
+			if (ret < 0) {
+				dev_err(card->dev, "codec dai not found\n");
ditto

+				return ret;
+			}
+			link->no_pcm = 1;
+			link->ignore_suspend = 1;
ignore_suspend will also need to be set for FE DAIs?

+			link->ignore_pmdown_time = 1;
+			link->be_hw_params_fixup = apq8096_be_hw_params_fixup;
+		} else {
+			link->platform_of_node = link->cpu_of_node;
+			link->codec_dai_name = "snd-soc-dummy-dai";
+			link->codec_name = "snd-soc-dummy";
+			link->dynamic = 1;
+		}
+
+		ret = of_property_read_string(np, "link-name", &link->name);
+		if (ret) {
+			dev_err(card->dev, "error getting codec dai_link name\n");
clean up

+			return ret;
+		}
+
+		link->dpcm_playback = 1;
+		link->dpcm_capture = 1;
+		link->stream_name = link->name;
+		link++;
+	}
+
+	return ret;
+}
+
+static int apq8096_bind(struct device *dev)
+{
+	struct snd_soc_card *card;
+	int ret;
+
+	card = kzalloc(sizeof(*card), GFP_KERNEL);
+	if (!card)
+		return -ENOMEM;
+
+	component_bind_all(dev, card);
+	card->dev = dev;
+	ret = apq8096_sbc_parse_of(card);
+	if (ret) {
+		dev_err(dev, "Error parsing OF data\n");
+		component_unbind_all(dev, card);
+		return ret;
+	}
+
+	return snd_soc_register_card(card);
+}
+
+static void apq8096_unbind(struct device *dev)
+{
+	struct snd_soc_card *card = dev_get_drvdata(dev);
+
+	component_unbind_all(dev, card);
+	snd_soc_unregister_card(card);
Should sound card not be unregistered first, before calling component_unbind_all()?

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