linux-kernel - [PATCH] ASoC: da7218: Enable mic level detection reporting to user-space

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Date:	Thu, 3 Dec 2015 10:45:50 +0000
From:	Adam Thomson <Adam.Thomson.Opensource@...semi.com>
To:	Mark Brown <broonie@...nel.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>
CC:	<alsa-devel@...a-project.org>, <linux-kernel@...r.kernel.org>,
	Support Opensource <support.opensource@...semi.com>
Subject: [PATCH] ASoC: da7218: Enable mic level detection reporting to
 user-space

This patch adds support to the codec driver to handle mic level
detect related IRQs, and report these to user-space using a uevent
variable.

Signed-off-by: Adam Thomson <Adam.Thomson.Opensource@...semi.com>
---
 sound/soc/codecs/da7218.c | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/sound/soc/codecs/da7218.c b/sound/soc/codecs/da7218.c
index 4fee7ae..752ed04 100644
--- a/sound/soc/codecs/da7218.c
+++ b/sound/soc/codecs/da7218.c
@@ -2202,6 +2202,16 @@ int da7218_hpldet(struct snd_soc_codec *codec, struct snd_soc_jack *jack)
 }
 EXPORT_SYMBOL_GPL(da7218_hpldet);

+static void da7218_micldet_irq(struct snd_soc_codec *codec)
+{
+	char *envp[] = {
+		"EVENT=MIC_LEVEL_DETECT",
+		NULL,
+	};
+
+	kobject_uevent_env(&codec->dev->kobj, KOBJ_CHANGE, envp);
+}
+
 static void da7218_hpldet_irq(struct snd_soc_codec *codec)
 {
 	struct da7218_priv *da7218 = snd_soc_codec_get_drvdata(codec);
@@ -2232,6 +2242,10 @@ static irqreturn_t da7218_irq_thread(int irq, void *data)
 	if (!status)
 		return IRQ_NONE;

+	/* Mic level detect */
+	if (status & DA7218_LVL_DET_EVENT_MASK)
+		da7218_micldet_irq(codec);
+
 	/* HP detect */
 	if (status & DA7218_HPLDET_JACK_EVENT_MASK)
 		da7218_hpldet_irq(codec);
@@ -2936,11 +2950,6 @@ static int da7218_probe(struct snd_soc_codec *codec)
 	}

 	if (da7218->irq) {
-		/* Mask off mic level events, currently not handled */
-		snd_soc_update_bits(codec, DA7218_EVENT_MASK,
-				    DA7218_LVL_DET_EVENT_MSK_MASK,
-				    DA7218_LVL_DET_EVENT_MSK_MASK);
-
 		ret = devm_request_threaded_irq(codec->dev, da7218->irq, NULL,
 						da7218_irq_thread,
 						IRQF_TRIGGER_LOW | IRQF_ONESHOT,
--
1.9.3

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