[PATCH 2/5] ASoC: rt5640: Delay requesting IRQ until the machine-drv calls set_jack

[Hans de Goede]

Delay requesting the IRQ until the machine-drv calls set_jack.

The main reason for this is that the codec's IRQ is unused on some boards,
in which case we really should not call request_irq at all.

On some boards there is an IRQ listed at index 0 for the codec, but
this is not connected to the codec, but rather is directly connected
to the jack's jack-detect pin. These special setups will be handled
by the machine-driver, but the machine driver can only request the IRQ
if it is not first requested by the codec driver. Moving the request_irq
to the set_jack callback (which will not get called in this case) avoids
the codec-driver clobbering the IRQ.

Moving the request_irq also removes the need to disable the IRQ immediately
after requesting it, avoiding a small race (this could also have been fixed
by using the new IRQF_NO_AUTOEN flag when requesting the IRQ).

Signed-off-by: Hans de Goede <hdegoede at redhat.com>
---
 sound/soc/codecs/rt5640.c | 27 +++++++++++++--------------
 1 file changed, 13 insertions(+), 14 deletions(-)

diff --git a/sound/soc/codecs/rt5640.c b/sound/soc/codecs/rt5640.c
index a425e6b1687d..d32e9d69231c 100644
--- a/sound/soc/codecs/rt5640.c
+++ b/sound/soc/codecs/rt5640.c
@@ -2373,7 +2373,7 @@ static void rt5640_disable_jack_detect(struct snd_soc_component *component)
 	if (!rt5640->jack)
 		return;
 
-	disable_irq(rt5640->irq);
+	free_irq(rt5640->irq, rt5640);
 	rt5640_cancel_work(rt5640);
 
 	if (rt5640->jack->status & SND_JACK_MICROPHONE) {
@@ -2389,6 +2389,7 @@ static void rt5640_enable_jack_detect(struct snd_soc_component *component,
 				      struct snd_soc_jack *jack)
 {
 	struct rt5640_priv *rt5640 = snd_soc_component_get_drvdata(component);
+	int ret;
 
 	/* Select JD-source */
 	snd_soc_component_update_bits(component, RT5640_JD_CTRL,
@@ -2446,7 +2447,17 @@ static void rt5640_enable_jack_detect(struct snd_soc_component *component,
 		rt5640_enable_micbias1_ovcd_irq(component);
 	}
 
-	enable_irq(rt5640->irq);
+	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;
+	}
+
 	/* sync initial jack state */
 	queue_work(system_long_wq, &rt5640->jack_work);
 }
@@ -2836,18 +2847,6 @@ static int rt5640_i2c_probe(struct i2c_client *i2c,
 	if (ret)
 		return ret;
 
-	ret = devm_request_irq(&i2c->dev, rt5640->irq, rt5640_irq,
-			       IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING
-			       | IRQF_ONESHOT, "rt5640", rt5640);
-	if (ret == 0) {
-		/* Gets re-enabled by rt5640_set_jack() */
-		disable_irq(rt5640->irq);
-	} else {
-		dev_warn(&i2c->dev, "Failed to reguest IRQ %d: %d\n",
-			 rt5640->irq, ret);
-		rt5640->irq = -ENXIO;
-	}
-
 	return devm_snd_soc_register_component(&i2c->dev,
 				      &soc_component_dev_rt5640,
 				      rt5640_dai, ARRAY_SIZE(rt5640_dai));
-- 
2.31.1