Allow retrieving accessory detection reference on

Merge series from "Nícolas F. R. A. Prado" <nfraprado@collabora.com>:

This series enables the MT8188-MT6359 sound driver to retrieve the
MT6359 ACCDET sound component from a mediatek,accdet DT property, which
allows detecting jack insertion/removal.

Patch 1 describes the new property in the binding. Patch 2 implements
the sound component retrieval in the common MTK soundcard driver. Patch
4 updates the MT8188-MT6359 sound driver to register the audio jack and
initialize the ACCDET driver for detection, if the property is present.

Patch 3 adds a stub to prevent a linker failure in case the
MT6359-ACCDET config is disabled.

Tested on the Genio 700 EVK board.

Documentation/devicetree/bindings/sound/mediatek,mt8188-mt6359.yaml

@@ -40,6 +40,14 @@ properties:
       hardware that provides additional audio functionalities if present.
       The AFE will link to ADSP when the phandle is provided.
 
+  mediatek,accdet:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description:
+      The phandle to the MT6359 accessory detection block, which detects audio
+      jack insertion and removal. This property should only be present if the
+      accdet block is actually wired to the audio jack pins and to be used for
+      jack detection.
+
 patternProperties:
   "^dai-link-[0-9]+$":
     type: object

sound/soc/codecs/mt6359-accdet.h

@@ -123,6 +123,15 @@ struct mt6359_accdet {
 	struct workqueue_struct *jd_workqueue;
 };
 
+#if IS_ENABLED(CONFIG_SND_SOC_MT6359_ACCDET)
 int mt6359_accdet_enable_jack_detect(struct snd_soc_component *component,
 				     struct snd_soc_jack *jack);
+#else
+static inline int
+mt6359_accdet_enable_jack_detect(struct snd_soc_component *component,
+				 struct snd_soc_jack *jack)
+{
+	return -EOPNOTSUPP;
+}
+#endif
 #endif

sound/soc/mediatek/common/mtk-soc-card.h

@@ -16,6 +16,7 @@ struct mtk_soc_card_data {
 	const struct mtk_sof_priv *sof_priv;
 	struct list_head sof_dai_link_list;
 	struct mtk_platform_card_data *card_data;
+	struct snd_soc_component *accdet;
 	void *mach_priv;
 };
 

sound/soc/mediatek/common/mtk-soundcard-driver.c

@@ -8,6 +8,7 @@
 
 #include <linux/module.h>
 #include <linux/of.h>
+#include <linux/of_platform.h>
 #include <sound/soc.h>
 
 #include "mtk-dsp-sof-common.h"
@@ -192,7 +193,9 @@ EXPORT_SYMBOL_GPL(mtk_soundcard_common_capture_ops);
 
 int mtk_soundcard_common_probe(struct platform_device *pdev)
 {
-	struct device_node *platform_node, *adsp_node;
+	struct device_node *platform_node, *adsp_node, *accdet_node;
+	struct snd_soc_component *accdet_comp;
+	struct platform_device *accdet_pdev;
 	const struct mtk_soundcard_pdata *pdata;
 	struct mtk_soc_card_data *soc_card_data;
 	struct snd_soc_dai_link *orig_dai_link, *dai_link;
@@ -250,6 +253,20 @@ int mtk_soundcard_common_probe(struct platform_device *pdev)
 
 	soc_card_data->card_data->jacks = jacks;
 
+	accdet_node = of_parse_phandle(pdev->dev.of_node, "mediatek,accdet", 0);
+	if (accdet_node) {
+		accdet_pdev = of_find_device_by_node(accdet_node);
+		if (accdet_pdev) {
+			accdet_comp = snd_soc_lookup_component(&accdet_pdev->dev, NULL);
+			if (accdet_comp)
+				soc_card_data->accdet = accdet_comp;
+			else
+				dev_err(&pdev->dev, "No sound component found from mediatek,accdet property\n");
+		} else {
+			dev_err(&pdev->dev, "No device found from mediatek,accdet property\n");
+		}
+	}
+
 	platform_node = of_parse_phandle(pdev->dev.of_node, "mediatek,platform", 0);
 	if (!platform_node)
 		return dev_err_probe(&pdev->dev, -EINVAL,

sound/soc/mediatek/mt8188/mt8188-mt6359.c

@@ -17,6 +17,7 @@
 #include "mt8188-afe-common.h"
 #include "../../codecs/nau8825.h"
 #include "../../codecs/mt6359.h"
+#include "../../codecs/mt6359-accdet.h"
 #include "../../codecs/rt5682.h"
 #include "../common/mtk-afe-platform-driver.h"
 #include "../common/mtk-soundcard-driver.h"
@@ -271,6 +272,17 @@ static struct snd_soc_jack_pin nau8825_jack_pins[] = {
 	},
 };
 
+static struct snd_soc_jack_pin mt8188_headset_jack_pins[] = {
+	{
+		.pin    = "Headphone",
+		.mask   = SND_JACK_HEADPHONE,
+	},
+	{
+		.pin    = "Headset Mic",
+		.mask   = SND_JACK_MICROPHONE,
+	},
+};
+
 static const struct snd_kcontrol_new mt8188_dumb_spk_controls[] = {
 	SOC_DAPM_PIN_SWITCH("Ext Spk"),
 };
@@ -506,6 +518,35 @@ static int mt8188_mt6359_mtkaif_calibration(struct snd_soc_pcm_runtime *rtd)
 	return 0;
 }
 
+static int mt8188_mt6359_accdet_init(struct snd_soc_pcm_runtime *rtd)
+{
+	struct mtk_soc_card_data *soc_card_data = snd_soc_card_get_drvdata(rtd->card);
+	struct snd_soc_jack *jack = &soc_card_data->card_data->jacks[MT8188_JACK_HEADSET];
+	int ret;
+
+	if (!soc_card_data->accdet)
+		return 0;
+
+	ret = snd_soc_card_jack_new_pins(rtd->card, "Headset Jack",
+				   SND_JACK_HEADSET | SND_JACK_BTN_0 |
+				   SND_JACK_BTN_1 | SND_JACK_BTN_2 |
+				   SND_JACK_BTN_3,
+				   jack, mt8188_headset_jack_pins,
+				   ARRAY_SIZE(mt8188_headset_jack_pins));
+	if (ret) {
+		dev_err(rtd->dev, "Headset Jack create failed: %d\n", ret);
+		return ret;
+	}
+
+	ret = mt6359_accdet_enable_jack_detect(soc_card_data->accdet, jack);
+	if (ret) {
+		dev_err(rtd->dev, "Headset Jack enable failed: %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
 static int mt8188_mt6359_init(struct snd_soc_pcm_runtime *rtd)
 {
 	struct snd_soc_component *cmpnt_codec =
@@ -518,6 +559,8 @@ static int mt8188_mt6359_init(struct snd_soc_pcm_runtime *rtd)
 	/* mtkaif calibration */
 	mt8188_mt6359_mtkaif_calibration(rtd);
 
+	mt8188_mt6359_accdet_init(rtd);
+
 	return 0;
 }