Machine driver to support LPASS SC7280 sound card registration

Merge series from Srinivasa Rao Mandadapu <quic_srivasam@quicinc.com>:

This patch set is to add support for SC7280 sound card registration and
to add dt-bindings documentation file.

Documentation/devicetree/bindings/sound/google,sc7280-herobrine.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/google,sc7280-herobrine.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Google SC7280-Herobrine ASoC sound card driver
+
+maintainers:
+  - Srinivasa Rao Mandadapu <srivasam@codeaurora.org>
+  - Judy Hsiao <judyhsiao@chromium.org>
+
+description:
+  This binding describes the SC7280 sound card which uses LPASS for audio.
+
+properties:
+  compatible:
+    enum:
+      - google,sc7280-herobrine
+
+  audio-routing:
+    $ref: /schemas/types.yaml#/definitions/non-unique-string-array
+    description:
+      A list of the connections between audio components. Each entry is a
+      pair of strings, the first being the connection's sink, the second
+      being the connection's source.
+
+  model:
+    $ref: /schemas/types.yaml#/definitions/string
+    description: User specified audio sound card name
+
+  "#address-cells":
+    const: 1
+
+  "#size-cells":
+    const: 0
+
+patternProperties:
+  "^dai-link@[0-9a-f]$":
+    description:
+      Each subnode represents a dai link. Subnodes of each dai links would be
+      cpu/codec dais.
+
+    type: object
+
+    properties:
+      link-name:
+        description: Indicates dai-link name and PCM stream name.
+        $ref: /schemas/types.yaml#/definitions/string
+        maxItems: 1
+
+      reg:
+        maxItems: 1
+        description: dai link address.
+
+      cpu:
+        description: Holds subnode which indicates cpu dai.
+        type: object
+        properties:
+          sound-dai: true
+
+        required:
+          - sound-dai
+
+        additionalProperties: false
+
+      codec:
+        description: Holds subnode which indicates codec dai.
+        type: object
+        properties:
+          sound-dai: true
+
+        required:
+          - sound-dai
+
+        additionalProperties: false
+
+    required:
+      - link-name
+      - cpu
+      - codec
+      - reg
+
+    additionalProperties: false
+
+required:
+  - compatible
+  - model
+  - "#address-cells"
+  - "#size-cells"
+
+additionalProperties: false
+
+examples:
+
+  - |
+    #include <dt-bindings/sound/qcom,lpass.h>
+    sound {
+        compatible = "google,sc7280-herobrine";
+        model = "sc7280-wcd938x-max98360a-4dmic";
+
+        audio-routing =
+            "IN1_HPHL", "HPHL_OUT",
+            "IN2_HPHR", "HPHR_OUT",
+            "AMIC1", "MIC BIAS1",
+            "AMIC2", "MIC BIAS2",
+            "VA DMIC0", "MIC BIAS3",
+            "VA DMIC1", "MIC BIAS3",
+            "VA DMIC2", "MIC BIAS4",
+            "VA DMIC3", "MIC BIAS4",
+            "TX SWR_ADC0", "ADC1_OUTPUT",
+            "TX SWR_ADC1", "ADC2_OUTPUT",
+            "TX SWR_ADC2", "ADC3_OUTPUT",
+            "TX SWR_DMIC0", "DMIC1_OUTPUT",
+            "TX SWR_DMIC1", "DMIC2_OUTPUT",
+            "TX SWR_DMIC2", "DMIC3_OUTPUT",
+            "TX SWR_DMIC3", "DMIC4_OUTPUT";
+
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        dai-link@0 {
+            link-name = "WCD Playback";
+            reg = <LPASS_CDC_DMA_RX0>;
+            cpu {
+                sound-dai = <&lpass_cpu LPASS_CDC_DMA_RX0>;
+            };
+
+            codec {
+                sound-dai = <&wcd938x 0>, <&swr0 0>, <&rxmacro 0>;
+            };
+        };
+        dai-link@1 {
+            link-name = "WCD Capture";
+            reg = <LPASS_CDC_DMA_TX3>;
+            cpu {
+                sound-dai = <&lpass_cpu LPASS_CDC_DMA_TX3>;
+            };
+
+            codec {
+                sound-dai = <&wcd938x 1>, <&swr1 0>, <&txmacro 0>;
+            };
+        };
+
+        dai-link@2 {
+            link-name = "MI2S Playback";
+            reg = <MI2S_SECONDARY>;
+            cpu {
+                sound-dai = <&lpass_cpu MI2S_SECONDARY>;
+            };
+
+            codec {
+                sound-dai = <&max98360a>;
+            };
+        };
+
+        dai-link@3 {
+            link-name = "DMIC Capture";
+            reg = <LPASS_CDC_DMA_VA_TX0>;
+            cpu {
+                sound-dai = <&lpass_cpu LPASS_CDC_DMA_VA_TX0>;
+            };
+
+            codec {
+                sound-dai = <&vamacro 0>;
+            };
+        };
+
+        dai-link@5 {
+            link-name = "DP Playback";
+            reg = <LPASS_DP_RX>;
+            cpu {
+                sound-dai = <&lpass_cpu LPASS_DP_RX>;
+            };
+
+            codec {
+                sound-dai = <&mdss_dp>;
+            };
+        };
+    };

sound/soc/qcom/Kconfig

@@ -176,4 +176,18 @@ config SND_SOC_SC7180
 	  SC7180 SoC-based systems.
 	  Say Y if you want to use audio device on this SoCs.
 
+config SND_SOC_SC7280
+	tristate "SoC Machine driver for SC7280 boards"
+	depends on I2C && SOUNDWIRE || COMPILE_TEST
+	select SND_SOC_QCOM_COMMON
+	select SND_SOC_LPASS_SC7280
+	select SND_SOC_MAX98357A
+	select SND_SOC_WCD938X
+	select SND_SOC_LPASS_RX_MACRO
+	select SND_SOC_LPASS_TX_MACRO
+	help
+	  Add support for audio on Qualcomm Technologies Inc.
+	  SC7280 SoC-based systems.
+	  Say Y or M if you want to use audio device on this SoCs.
+
 endif #SND_SOC_QCOM

sound/soc/qcom/Makefile

@@ -19,6 +19,7 @@ snd-soc-storm-objs := storm.o
 snd-soc-apq8016-sbc-objs := apq8016_sbc.o
 snd-soc-apq8096-objs := apq8096.o
 snd-soc-sc7180-objs := sc7180.o
+snd-soc-sc7280-objs := sc7280.o
 snd-soc-sdm845-objs := sdm845.o
 snd-soc-sm8250-objs := sm8250.o
 snd-soc-qcom-common-objs := common.o
@@ -27,6 +28,7 @@ obj-$(CONFIG_SND_SOC_STORM) += snd-soc-storm.o
 obj-$(CONFIG_SND_SOC_APQ8016_SBC) += snd-soc-apq8016-sbc.o
 obj-$(CONFIG_SND_SOC_MSM8996) += snd-soc-apq8096.o
 obj-$(CONFIG_SND_SOC_SC7180) += snd-soc-sc7180.o
+obj-$(CONFIG_SND_SOC_SC7280) += snd-soc-sc7280.o
 obj-$(CONFIG_SND_SOC_SDM845) += snd-soc-sdm845.o
 obj-$(CONFIG_SND_SOC_SM8250) += snd-soc-sm8250.o
 obj-$(CONFIG_SND_SOC_QCOM_COMMON) += snd-soc-qcom-common.o

sound/soc/qcom/lpass.h

@@ -16,6 +16,7 @@
 #include "lpass-hdmi.h"
 
 #define LPASS_AHBIX_CLOCK_FREQUENCY		131072000
+#define LPASS_MAX_PORTS			(LPASS_CDC_DMA_VA_TX8 + 1)
 #define LPASS_MAX_MI2S_PORTS			(8)
 #define LPASS_MAX_DMA_CHANNELS			(8)
 #define LPASS_MAX_HDMI_DMA_CHANNELS		(4)

sound/soc/qcom/sc7280.c

+// SPDX-License-Identifier: GPL-2.0-only
+//
+// Copyright (c) 2020-2021, The Linux Foundation. All rights reserved.
+//
+// ALSA SoC Machine driver for sc7280
+
+#include <linux/input.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <sound/core.h>
+#include <sound/jack.h>
+#include <sound/pcm.h>
+#include <sound/soc.h>
+#include <linux/soundwire/sdw.h>
+
+#include "common.h"
+#include "lpass.h"
+
+struct sc7280_snd_data {
+	struct snd_soc_card card;
+	struct sdw_stream_runtime *sruntime[LPASS_MAX_PORTS];
+	struct snd_soc_jack hs_jack;
+	struct snd_soc_jack hdmi_jack;
+	bool jack_setup;
+	bool stream_prepared[LPASS_MAX_PORTS];
+};
+
+static void sc7280_jack_free(struct snd_jack *jack)
+{
+	struct snd_soc_component *component = jack->private_data;
+
+	snd_soc_component_set_jack(component, NULL, NULL);
+}
+
+static int sc7280_headset_init(struct snd_soc_pcm_runtime *rtd)
+{
+	struct snd_soc_card *card = rtd->card;
+	struct sc7280_snd_data *pdata = snd_soc_card_get_drvdata(card);
+	struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0);
+	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
+	struct snd_soc_component *component = codec_dai->component;
+	struct snd_jack *jack;
+	int rval, i;
+
+	if (!pdata->jack_setup) {
+		rval = snd_soc_card_jack_new(card, "Headset Jack",
+					     SND_JACK_HEADSET | SND_JACK_LINEOUT |
+					     SND_JACK_MECHANICAL |
+					     SND_JACK_BTN_0 | SND_JACK_BTN_1 |
+					     SND_JACK_BTN_2 | SND_JACK_BTN_3 |
+					     SND_JACK_BTN_4 | SND_JACK_BTN_5,
+					     &pdata->hs_jack, NULL, 0);
+
+		if (rval < 0) {
+			dev_err(card->dev, "Unable to add Headset Jack\n");
+			return rval;
+		}
+
+		jack = pdata->hs_jack.jack;
+
+		snd_jack_set_key(jack, SND_JACK_BTN_0, KEY_PLAYPAUSE);
+		snd_jack_set_key(jack, SND_JACK_BTN_1, KEY_VOICECOMMAND);
+		snd_jack_set_key(jack, SND_JACK_BTN_2, KEY_VOLUMEUP);
+		snd_jack_set_key(jack, SND_JACK_BTN_3, KEY_VOLUMEDOWN);
+
+		jack->private_data = component;
+		jack->private_free = sc7280_jack_free;
+		pdata->jack_setup = true;
+	}
+	switch (cpu_dai->id) {
+	case LPASS_CDC_DMA_RX0:
+	case LPASS_CDC_DMA_TX3:
+		for_each_rtd_codec_dais(rtd, i, codec_dai) {
+			rval = snd_soc_component_set_jack(component, &pdata->hs_jack, NULL);
+			if (rval != 0 && rval != -ENOTSUPP) {
+				dev_err(card->dev, "Failed to set jack: %d\n", rval);
+				return rval;
+			}
+		}
+		break;
+	default:
+		break;
+	}
+
+	return 0;
+}
+
+static int sc7280_hdmi_init(struct snd_soc_pcm_runtime *rtd)
+{
+	struct snd_soc_card *card = rtd->card;
+	struct sc7280_snd_data *pdata = snd_soc_card_get_drvdata(card);
+	struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0);
+	struct snd_soc_component *component = codec_dai->component;
+	struct snd_jack *jack;
+	int rval;
+
+	rval = snd_soc_card_jack_new(card, "HDMI Jack",	SND_JACK_LINEOUT,
+				     &pdata->hdmi_jack, NULL, 0);
+
+	if (rval < 0) {
+		dev_err(card->dev, "Unable to add HDMI Jack\n");
+		return rval;
+	}
+
+	jack = pdata->hdmi_jack.jack;
+	jack->private_data = component;
+	jack->private_free = sc7280_jack_free;
+
+	return snd_soc_component_set_jack(component, &pdata->hdmi_jack, NULL);
+}
+
+static int sc7280_init(struct snd_soc_pcm_runtime *rtd)
+{
+	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
+
+	switch (cpu_dai->id) {
+	case LPASS_CDC_DMA_TX3:
+		return sc7280_headset_init(rtd);
+	case LPASS_CDC_DMA_RX0:
+	case LPASS_CDC_DMA_VA_TX0:
+	case MI2S_SECONDARY:
+		return 0;
+	case LPASS_DP_RX:
+		return sc7280_hdmi_init(rtd);
+	default:
+		dev_err(rtd->dev, "%s: invalid dai id 0x%x\n", __func__, cpu_dai->id);
+	}
+
+	return -EINVAL;
+}
+
+static int sc7280_snd_hw_params(struct snd_pcm_substream *substream,
+				struct snd_pcm_hw_params *params)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_dai *codec_dai;
+	const struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
+	struct sc7280_snd_data *pdata = snd_soc_card_get_drvdata(rtd->card);
+	struct sdw_stream_runtime *sruntime;
+	int i;
+
+	snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, 2, 2);
+	snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE, 48000, 48000);
+
+	switch (cpu_dai->id) {
+	case LPASS_CDC_DMA_TX3:
+	case LPASS_CDC_DMA_RX0:
+		for_each_rtd_codec_dais(rtd, i, codec_dai) {
+			sruntime = snd_soc_dai_get_stream(codec_dai, substream->stream);
+			if (sruntime != ERR_PTR(-ENOTSUPP))
+				pdata->sruntime[cpu_dai->id] = sruntime;
+		}
+		break;
+	}
+
+	return 0;
+}
+
+static int sc7280_snd_swr_prepare(struct snd_pcm_substream *substream)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	const struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
+	struct sc7280_snd_data *data = snd_soc_card_get_drvdata(rtd->card);
+	struct sdw_stream_runtime *sruntime = data->sruntime[cpu_dai->id];
+	int ret;
+
+	if (!sruntime)
+		return 0;
+
+	if (data->stream_prepared[cpu_dai->id]) {
+		sdw_disable_stream(sruntime);
+		sdw_deprepare_stream(sruntime);
+		data->stream_prepared[cpu_dai->id] = false;
+	}
+
+	ret = sdw_prepare_stream(sruntime);
+	if (ret)
+		return ret;
+
+	ret = sdw_enable_stream(sruntime);
+	if (ret) {
+		sdw_deprepare_stream(sruntime);
+		return ret;
+	}
+	data->stream_prepared[cpu_dai->id] = true;
+
+	return ret;
+}
+
+static int sc7280_snd_prepare(struct snd_pcm_substream *substream)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	const struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
+
+	switch (cpu_dai->id) {
+	case LPASS_CDC_DMA_RX0:
+	case LPASS_CDC_DMA_TX3:
+		return sc7280_snd_swr_prepare(substream);
+	default:
+		break;
+	}
+
+	return 0;
+}
+
+static int sc7280_snd_hw_free(struct snd_pcm_substream *substream)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct sc7280_snd_data *data = snd_soc_card_get_drvdata(rtd->card);
+	const struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
+	struct sdw_stream_runtime *sruntime = data->sruntime[cpu_dai->id];
+
+	switch (cpu_dai->id) {
+	case LPASS_CDC_DMA_RX0:
+	case LPASS_CDC_DMA_TX3:
+		if (sruntime && data->stream_prepared[cpu_dai->id]) {
+			sdw_disable_stream(sruntime);
+			sdw_deprepare_stream(sruntime);
+			data->stream_prepared[cpu_dai->id] = false;
+		}
+		break;
+	default:
+		break;
+	}
+	return 0;
+}
+
+static const struct snd_soc_ops sc7280_ops = {
+	.hw_params = sc7280_snd_hw_params,
+	.hw_free = sc7280_snd_hw_free,
+	.prepare = sc7280_snd_prepare,
+};
+
+static int sc7280_snd_platform_probe(struct platform_device *pdev)
+{
+	struct snd_soc_card *card;
+	struct sc7280_snd_data *data;
+	struct device *dev = &pdev->dev;
+	struct snd_soc_dai_link *link;
+	int ret, i;
+
+	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	card = &data->card;
+	snd_soc_card_set_drvdata(card, data);
+
+	card->owner = THIS_MODULE;
+	card->driver_name = "SC7280";
+	card->dev = dev;
+
+	ret = qcom_snd_parse_of(card);
+	if (ret)
+		return ret;
+
+	for_each_card_prelinks(card, i, link) {
+		link->init = sc7280_init;
+		link->ops = &sc7280_ops;
+	}
+
+	return devm_snd_soc_register_card(dev, card);
+}
+
+static const struct of_device_id sc7280_snd_device_id[]  = {
+	{ .compatible = "google,sc7280-herobrine" },
+	{}
+};
+MODULE_DEVICE_TABLE(of, sc7280_snd_device_id);
+
+static struct platform_driver sc7280_snd_driver = {
+	.probe = sc7280_snd_platform_probe,
+	.driver = {
+		.name = "msm-snd-sc7280",
+		.of_match_table = sc7280_snd_device_id,
+		.pm = &snd_soc_pm_ops,
+	},
+};
+module_platform_driver(sc7280_snd_driver);
+
+MODULE_DESCRIPTION("sc7280 ASoC Machine Driver");
+MODULE_LICENSE("GPL");