[PATCH v2 1/3] ASoC: jack: Add an export of a function that calls the codec jack detection

[Xing Zheng <zhengxing-TNX95d0MmH7DzftRWevZcw@public.gmane.org>]

This patch add an export of a function. We can fill the detect_jack
function in the struct snd_soc_codec_driver, and to tell sound machine
driver (simple-card) that the codec supports the jack detection feature.

Then, the machine driver (simple-card) call the export function of the
sound framework to initialize jack detection via the codec.

Signed-off-by: Xing Zheng <zhengxing-TNX95d0MmH7DzftRWevZcw@public.gmane.org>
---

Changes in v1:
- clean up the commit message and notes

 include/sound/soc.h  |    7 +++++++
 sound/soc/soc-jack.c |   17 +++++++++++++++++
 2 files changed, 24 insertions(+)

diff --git a/include/sound/soc.h b/include/sound/soc.h
index 02b4a21..64e3f4a 100644
--- a/include/sound/soc.h
+++ b/include/sound/soc.h
@@ -547,6 +547,10 @@ static inline void snd_soc_jack_free_gpios(struct snd_soc_jack *jack, int count,
 }
 #endif
 
+/* call and init jack detect via the codec */
+void snd_soc_jack_codec_detect(struct snd_soc_codec *codec,
+				struct snd_soc_jack *jack);
+
 /* codec register bit access */
 int snd_soc_update_bits(struct snd_soc_codec *codec, unsigned int reg,
 				unsigned int mask, unsigned int value);
@@ -920,6 +924,9 @@ struct snd_soc_codec_driver {
 			     enum snd_soc_dapm_type, int);
 
 	bool ignore_pmdown_time;  /* Doesn't benefit from pmdown delay */
+
+	/* fill this function if the codec supports jack detection */
+	void (*detect_jack)(struct snd_soc_codec *codec, struct snd_soc_jack *jack);
 };
 
 /* SoC platform interface */
diff --git a/sound/soc/soc-jack.c b/sound/soc/soc-jack.c
index fbaa1bb..ccaf546 100644
--- a/sound/soc/soc-jack.c
+++ b/sound/soc/soc-jack.c
@@ -436,3 +436,20 @@ void snd_soc_jack_free_gpios(struct snd_soc_jack *jack, int count,
 }
 EXPORT_SYMBOL_GPL(snd_soc_jack_free_gpios);
 #endif	/* CONFIG_GPIOLIB */
+
+/**
+ * snd_soc_jack_codec_detect - Call and init jack detection if the codec support it
+ *
+ * @codec: ASoC codec
+ * @jack:  ASoC jack
+ *
+ * Call and initialize the codec jack detection if the codec supports it and fills
+ * the detect_jack function in the struct snd_soc_codec_driver.
+ */
+void snd_soc_jack_codec_detect(struct snd_soc_codec *codec,
+				struct snd_soc_jack *jack)
+{
+	if (codec && codec->driver && codec->driver->detect_jack)
+		codec->driver->detect_jack(codec, jack);
+}
+EXPORT_SYMBOL_GPL(snd_soc_jack_codec_detect);
-- 
1.7.9.5