ASoC: tlv320aic3x: headset/button press support

- Add aic3x_set_headset_detection() function to define the headset
  detection mode for tlv32aic3x chips
- added aic3x_button_pressed()
- Read from the real-time registers in aic3x_headset_detected() to query
  headset presence without an occured interrupt

Signed-off-by: Daniel Mack <daniel@caiaq.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 45 insertions, 1 deletions

diff --git a/sound/soc/codecs/tlv320aic3x.h b/sound/soc/codecs/tlv320aic3x.h
index 7e982acf3996..73e35b6ec929 100644
--- a/sound/soc/codecs/tlv320aic3x.h
+++ b/sound/soc/codecs/tlv320aic3x.h
@@ -39,7 +39,9 @@
 #define AIC3X_OVRF_STATUS_AND_PLLR_REG	11
 /* Audio codec digital filter control register */
 #define AIC3X_CODEC_DFILT_CTRL		12
-
+/* Headset/button press detection register */
+#define AIC3X_HEADSET_DETECT_CTRL_A	13
+#define AIC3X_HEADSET_DETECT_CTRL_B	14
 /* ADC PGA Gain control registers */
 #define LADC_VOL			15
 #define RADC_VOL			16
@@ -233,7 +235,49 @@ enum {
 
 void aic3x_set_gpio(struct snd_soc_codec *codec, int gpio, int state);
 int aic3x_get_gpio(struct snd_soc_codec *codec, int gpio);
+
+/* headset detection / button API */
+
+/* The AIC3x supports detection of stereo headsets (GND + left + right signal)
+ * and cellular headsets (GND + speaker output + microphone input).
+ * It is recommended to enable MIC bias for this function to work properly.
+ * For more information, please refer to the datasheet. */
+enum {
+	AIC3X_HEADSET_DETECT_OFF	= 0,
+	AIC3X_HEADSET_DETECT_STEREO	= 1,
+	AIC3X_HEADSET_DETECT_CELLULAR   = 2,
+	AIC3X_HEADSET_DETECT_BOTH	= 3
+};
+
+enum {
+	AIC3X_HEADSET_DEBOUNCE_16MS	= 0,
+	AIC3X_HEADSET_DEBOUNCE_32MS	= 1,
+	AIC3X_HEADSET_DEBOUNCE_64MS	= 2,
+	AIC3X_HEADSET_DEBOUNCE_128MS	= 3,
+	AIC3X_HEADSET_DEBOUNCE_256MS	= 4,
+	AIC3X_HEADSET_DEBOUNCE_512MS	= 5
+};
+
+enum {
+	AIC3X_BUTTON_DEBOUNCE_0MS	= 0,
+	AIC3X_BUTTON_DEBOUNCE_8MS	= 1,
+	AIC3X_BUTTON_DEBOUNCE_16MS	= 2,
+	AIC3X_BUTTON_DEBOUNCE_32MS	= 3
+};
+
+#define AIC3X_HEADSET_DETECT_ENABLED	0x80
+#define AIC3X_HEADSET_DETECT_SHIFT	5
+#define AIC3X_HEADSET_DETECT_MASK	3
+#define AIC3X_HEADSET_DEBOUNCE_SHIFT	2
+#define AIC3X_HEADSET_DEBOUNCE_MASK	7
+#define AIC3X_BUTTON_DEBOUNCE_SHIFT 	0
+#define AIC3X_BUTTON_DEBOUNCE_MASK	3
+
+/* see the enums above for valid parameters to this function */
+void aic3x_set_headset_detection(struct snd_soc_codec *codec, int detect,
+				 int headset_debounce, int button_debounce);
 int aic3x_headset_detected(struct snd_soc_codec *codec);
+int aic3x_button_pressed(struct snd_soc_codec *codec);
 
 struct aic3x_setup_data {
 	int i2c_bus;