ASoC: rt5640: Add support for boards with an external jack-detect GPIO

Some boards have the codec IRQ hooked-up as normally, so the driver can
still do things like headset vs headphones and button-press detection,
but instead of using one of the JD pins of the codec, an external GPIO
is used to report the jack-presence switch status of the jack.

Add support for this.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20220106110128.66049-5-hdegoede@redhat.com
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/rt5640.c

@@ -2160,7 +2160,11 @@ static bool rt5640_jack_inserted(struct snd_soc_component *component)
 	struct rt5640_priv *rt5640 = snd_soc_component_get_drvdata(component);
 	int val;
 
-	val = snd_soc_component_read(component, RT5640_INT_IRQ_ST);
+	if (rt5640->jd_gpio)
+		val = gpiod_get_value(rt5640->jd_gpio) ? RT5640_JD_STATUS : 0;
+	else
+		val = snd_soc_component_read(component, RT5640_INT_IRQ_ST);
+
 	dev_dbg(component->dev, "irq status %#04x\n", val);
 
 	if (rt5640->jd_inverted)
@@ -2395,6 +2399,16 @@ static irqreturn_t rt5640_irq(int irq, void *data)
 	return IRQ_HANDLED;
 }
 
+static irqreturn_t rt5640_jd_gpio_irq(int irq, void *data)
+{
+	struct rt5640_priv *rt5640 = data;
+
+	queue_delayed_work(system_long_wq, &rt5640->jack_work,
+			   msecs_to_jiffies(JACK_SETTLE_TIME));
+
+	return IRQ_HANDLED;
+}
+
 static void rt5640_cancel_work(void *data)
 {
 	struct rt5640_priv *rt5640 = data;
@@ -2439,7 +2453,12 @@ static void rt5640_disable_jack_detect(struct snd_soc_component *component)
 	if (!rt5640->jack)
 		return;
 
-	free_irq(rt5640->irq, rt5640);
+	if (rt5640->jd_gpio_irq_requested)
+		free_irq(rt5640->jd_gpio_irq, rt5640);
+
+	if (rt5640->irq_requested)
+		free_irq(rt5640->irq, rt5640);
+
 	rt5640_cancel_work(rt5640);
 
 	if (rt5640->jack->status & SND_JACK_MICROPHONE) {
@@ -2448,6 +2467,9 @@ static void rt5640_disable_jack_detect(struct snd_soc_component *component)
 		snd_soc_jack_report(rt5640->jack, 0, SND_JACK_BTN_0);
 	}
 
+	rt5640->jd_gpio_irq_requested = false;
+	rt5640->irq_requested = false;
+	rt5640->jd_gpio = NULL;
 	rt5640->jack = NULL;
 }
 
@@ -2500,16 +2522,31 @@ static void rt5640_enable_jack_detect(struct snd_soc_component *component,
 	if (jack_data && jack_data->codec_irq_override)
 		rt5640->irq = jack_data->codec_irq_override;
 
+	if (jack_data && jack_data->jd_gpio) {
+		rt5640->jd_gpio = jack_data->jd_gpio;
+		rt5640->jd_gpio_irq = gpiod_to_irq(rt5640->jd_gpio);
+
+		ret = request_irq(rt5640->jd_gpio_irq, rt5640_jd_gpio_irq,
+				  IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
+				  "rt5640-jd-gpio", rt5640);
+		if (ret) {
+			dev_warn(component->dev, "Failed to request jd GPIO IRQ %d: %d\n",
+				 rt5640->jd_gpio_irq, ret);
+			rt5640_disable_jack_detect(component);
+			return;
+		}
+		rt5640->jd_gpio_irq_requested = true;
+	}
+
 	ret = request_irq(rt5640->irq, rt5640_irq,
 			  IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
 			  "rt5640", rt5640);
 	if (ret) {
 		dev_warn(component->dev, "Failed to reguest IRQ %d: %d\n", rt5640->irq, ret);
-		rt5640->irq = -ENXIO;
-		/* Undo above settings */
 		rt5640_disable_jack_detect(component);
 		return;
 	}
+	rt5640->irq_requested = true;
 
 	/* sync initial jack state */
 	queue_delayed_work(system_long_wq, &rt5640->jack_work, 0);

sound/soc/codecs/rt5640.h

@@ -2124,6 +2124,7 @@ struct rt5640_priv {
 
 	int ldo1_en; /* GPIO for LDO1_EN */
 	int irq;
+	int jd_gpio_irq;
 	int sysclk;
 	int sysclk_src;
 	int lrck[RT5640_AIFS];
@@ -2136,6 +2137,8 @@ struct rt5640_priv {
 
 	bool hp_mute;
 	bool asrc_en;
+	bool irq_requested;
+	bool jd_gpio_irq_requested;
 
 	/* Jack and button detect data */
 	bool ovcd_irq_enabled;
@@ -2147,6 +2150,7 @@ struct rt5640_priv {
 	struct delayed_work bp_work;
 	struct delayed_work jack_work;
 	struct snd_soc_jack *jack;
+	struct gpio_desc *jd_gpio;
 	unsigned int jd_src;
 	bool jd_inverted;
 	unsigned int ovcd_th;
@@ -2155,6 +2159,7 @@ struct rt5640_priv {
 
 struct rt5640_set_jack_data {
 	int codec_irq_override;
+	struct gpio_desc *jd_gpio;
 };
 
 int rt5640_dmic_enable(struct snd_soc_component *component,