From: Srinivas Kandagatla <srinivas.kandaga...@linaro.org>

MBHC (MultiButton Headset Control) support is available in pm8921 in two
blocks, one to detect mechanical headset insertion and removal and other
block to support headset type detection and 5 button detection and othe
features like impedance calculation.

This patch adds support to:
1> Support to NC and NO type of headset Jacks.
2> Mechanical insertion and detection of headset jack.
3> Detect a 3 pole Headphone and a 4 pole Headset.
4> Detect 5 buttons.

Tested it on DB410c with Audio Mezz board with 4 pole and 3 pole
headset/headphones.

Signed-off-by: Srinivas Kandagatla <srinivas.kandaga...@linaro.org>
---
 .../bindings/sound/qcom,msm8916-wcd-analog.txt     |  17 +-
 sound/soc/codecs/msm8916-wcd-analog.c              | 373 ++++++++++++++++++++-
 2 files changed, 388 insertions(+), 2 deletions(-)

diff --git 
a/Documentation/devicetree/bindings/sound/qcom,msm8916-wcd-analog.txt 
b/Documentation/devicetree/bindings/sound/qcom,msm8916-wcd-analog.txt
index 05b67a1..551ecab 100644
--- a/Documentation/devicetree/bindings/sound/qcom,msm8916-wcd-analog.txt
+++ b/Documentation/devicetree/bindings/sound/qcom,msm8916-wcd-analog.txt
@@ -31,9 +31,22 @@ Required properties
  - vdd-cdc-io-supply: phandle to VDD_CDC_IO regulator DT node.
  - vdd-cdc-tx-rx-cx-supply: phandle to VDD_CDC_TX/RX/CX regulator DT node.
  - vdd-micbias-supply: phandle of VDD_MICBIAS supply's regulator DT node.
-
 Optional Properties:
+ - qcom,mbhc-vthreshold-low: Array of 5 threshold voltages in mV for 5 buttons
+                            detection on headset when the mbhc is powered up
+                            by internal current source, this is a low power.
+ - qcom,mbhc-vthreshold-high: Array of 5 thresold voltages in mV for 5 buttons
+                             detection on headset when mbhc is powered up
+                              from micbias.
 - qcom,micbias-lvl:  Voltage (mV) for Mic Bias
+- qcom,hphl-jack-type-normally-open: boolean, present if hphl pin on jack is a
+                                    NO (Normally Open). If not specified, then
+                                    its assumed that hphl pin on jack is NC
+                                    (Normally Closed).
+- qcom,gnd-jack-type-normally-open: boolean, present if gnd pin on jack is
+                                   NO (Normally Open). If not specified, then
+                                   its assumed that gnd pin on jack is NC
+                                   (Normally Closed).
 - qcom,micbias1-ext-cap: boolean, present if micbias1 has external capacitor
                         connected.
 - qcom,micbias2-ext-cap: boolean, present if micbias2 has external capacitor
@@ -49,6 +62,8 @@ spmi_bus {
                reg-names = "pmic-codec-core";
                clocks = <&gcc GCC_CODEC_DIGCODEC_CLK>;
                clock-names = "mclk";
+               qcom,mbhc-vthreshold-low = <75 150 237 450 500>;
+               qcom,mbhc-vthreshold-high = <75 150 237 450 500>;
                interrupt-parent = <&spmi_bus>;
                interrupts = <0x1 0xf0 0x0 IRQ_TYPE_NONE>,
                             <0x1 0xf0 0x1 IRQ_TYPE_NONE>,
diff --git a/sound/soc/codecs/msm8916-wcd-analog.c 
b/sound/soc/codecs/msm8916-wcd-analog.c
index dec4978..b84aeb4 100644
--- a/sound/soc/codecs/msm8916-wcd-analog.c
+++ b/sound/soc/codecs/msm8916-wcd-analog.c
@@ -12,9 +12,16 @@
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
 #include <sound/tlv.h>
+#include <sound/jack.h>
 
 #define CDC_D_REVISION1                        (0xf000)
 #define CDC_D_PERPH_SUBTYPE            (0xf005)
+#define CDC_D_INT_EN_SET               (0x015)
+#define CDC_D_INT_EN_CLR               (0x016)
+#define MBHC_SWITCH_INT                        BIT(7)
+#define MBHC_MIC_ELECTRICAL_INS_REM_DET        BIT(6)
+#define MBHC_BUTTON_PRESS_DET          BIT(5)
+#define MBHC_BUTTON_RELEASE_DET                BIT(4)
 #define CDC_D_CDC_RST_CTL              (0xf046)
 #define RST_CTL_DIG_SW_RST_N_MASK      BIT(7)
 #define RST_CTL_DIG_SW_RST_N_RESET     0
@@ -37,6 +44,8 @@
 #define DIG_CLK_CTL_RXD1_CLK_EN                BIT(0)
 #define DIG_CLK_CTL_RXD2_CLK_EN                BIT(1)
 #define DIG_CLK_CTL_RXD3_CLK_EN                BIT(2)
+#define DIG_CLK_CTL_D_MBHC_CLK_EN_MASK BIT(3)
+#define DIG_CLK_CTL_D_MBHC_CLK_EN      BIT(3)
 #define DIG_CLK_CTL_TXD_CLK_EN         BIT(4)
 #define DIG_CLK_CTL_NCP_CLK_EN_MASK    BIT(6)
 #define DIG_CLK_CTL_NCP_CLK_EN         BIT(6)
@@ -132,8 +141,51 @@
 #define MICB_1_INT_TX3_INT_PULLUP_EN_TX1N_TO_GND       0
 
 #define CDC_A_MICB_2_EN                        (0xf144)
+#define CDC_A_MICB_2_EN_ENABLE         BIT(7)
+#define CDC_A_MICB_2_PULL_DOWN_EN_MASK BIT(5)
+#define CDC_A_MICB_2_PULL_DOWN_EN      BIT(5)
 #define CDC_A_TX_1_2_ATEST_CTL_2       (0xf145)
 #define CDC_A_MASTER_BIAS_CTL          (0xf146)
+#define CDC_A_MBHC_DET_CTL_1           (0xf147)
+#define CDC_A_MBHC_DET_CTL_L_DET_EN                    BIT(7)
+#define CDC_A_MBHC_DET_CTL_GND_DET_EN                  BIT(6)
+#define CDC_A_MBHC_DET_CTL_MECH_DET_TYPE_INSERTION     BIT(5)
+#define CDC_A_MBHC_DET_CTL_MECH_DET_TYPE_REMOVAL       (0)
+#define CDC_A_MBHC_DET_CTL_MECH_DET_TYPE_MASK          BIT(5)
+#define CDC_A_MBHC_DET_CTL_MECH_DET_TYPE_SHIFT         (5)
+#define CDC_A_MBHC_DET_CTL_MIC_CLAMP_CTL_AUTO          BIT(4)
+#define CDC_A_MBHC_DET_CTL_MIC_CLAMP_CTL_MANUAL                BIT(3)
+#define CDC_A_MBHC_DET_CTL_MIC_CLAMP_CTL_MASK          GENMASK(4, 3)
+#define CDC_A_MBHC_DET_CTL_MBHC_BIAS_EN                        BIT(2)
+#define CDC_A_MBHC_DET_CTL_2           (0xf150)
+#define CDC_A_MBHC_DET_CTL_HS_L_DET_PULL_UP_CTRL_I_3P0 (BIT(7) | BIT(6))
+#define CDC_A_MBHC_DET_CTL_HS_L_DET_COMPA_CTRL_V0P9_VDD        BIT(5)
+#define CDC_A_PLUG_TYPE_MASK                           GENMASK(4, 3)
+#define CDC_A_HPHL_PLUG_TYPE_NO                                BIT(4)
+#define CDC_A_GND_PLUG_TYPE_NO                         BIT(3)
+#define CDC_A_MBHC_DET_CTL_HPHL_100K_TO_GND_EN_MASK    BIT(0)
+#define CDC_A_MBHC_DET_CTL_HPHL_100K_TO_GND_EN         BIT(0)
+#define CDC_A_MBHC_FSM_CTL             (0xf151)
+#define CDC_A_MBHC_FSM_CTL_MBHC_FSM_EN                 BIT(7)
+#define CDC_A_MBHC_FSM_CTL_MBHC_FSM_EN_MASK            BIT(7)
+#define CDC_A_MBHC_FSM_CTL_BTN_ISRC_CTRL_I_100UA       (0x3 << 4)
+#define CDC_A_MBHC_FSM_CTL_BTN_ISRC_CTRL_MASK          GENMASK(6, 4)
+#define CDC_A_MBHC_DBNC_TIMER          (0xf152)
+#define CDC_A_MBHC_DBNC_TIMER_BTN_DBNC_T_16MS          BIT(3)
+#define CDC_A_MBHC_DBNC_TIMER_INSREM_DBNC_T_256_MS     (0x9 << 4)
+#define CDC_A_MBHC_BTN0_ZDET_CTL_0     (0xf153)
+#define CDC_A_MBHC_BTN1_ZDET_CTL_1     (0xf154)
+#define CDC_A_MBHC_BTN2_ZDET_CTL_2     (0xf155)
+#define CDC_A_MBHC_BTN3_CTL            (0xf156)
+#define CDC_A_MBHC_BTN4_CTL            (0xf157)
+#define CDC_A_MBHC_BTN_VREF_FINE_SHIFT (2)
+#define CDC_A_MBHC_BTN_VREF_FINE_MASK  GENMASK(4, 2)
+#define CDC_A_MBHC_BTN_VREF_COARSE_MASK        GENMASK(7, 5)
+#define CDC_A_MBHC_BTN_VREF_COARSE_SHIFT (5)
+#define CDC_A_MBHC_BTN_VREF_MASK       (CDC_A_MBHC_BTN_VREF_COARSE_MASK | \
+                                       CDC_A_MBHC_BTN_VREF_FINE_MASK)
+#define CDC_A_MBHC_RESULT_1            (0xf158)
+#define CDC_A_MBHC_RESULT_1_BTN_RESULT_MASK    GENMASK(4, 0)
 #define CDC_A_TX_1_EN                  (0xf160)
 #define CDC_A_TX_2_EN                  (0xf161)
 #define CDC_A_TX_1_2_TEST_CTL_1                (0xf162)
@@ -217,16 +269,34 @@
 #define MSM8916_WCD_ANALOG_FORMATS (SNDRV_PCM_FMTBIT_S16_LE |\
                                    SNDRV_PCM_FMTBIT_S24_LE)
 
+static int btn_mask = SND_JACK_BTN_0 | SND_JACK_BTN_1 |
+              SND_JACK_BTN_2 | SND_JACK_BTN_3 | SND_JACK_BTN_4;
+static int hs_jack_mask = SND_JACK_HEADPHONE | SND_JACK_HEADSET;
+
 static const char * const supply_names[] = {
        "vdd-cdc-io",
        "vdd-cdc-tx-rx-cx",
 };
 
+#define MBHC_MAX_BUTTONS       (5)
+
 struct pm8916_wcd_analog_priv {
        u16 pmic_rev;
        u16 codec_version;
+       bool    mbhc_btn_enabled;
+       /* special event to detect accessory type */
+       bool    mbhc_btn0_pressed;
+       bool    detect_accessory_type;
        struct clk *mclk;
+       struct snd_soc_codec *codec;
        struct regulator_bulk_data supplies[ARRAY_SIZE(supply_names)];
+       struct snd_soc_jack *jack;
+       bool hphl_jack_type_normally_open;
+       bool gnd_jack_type_normally_open;
+       /* Voltage threshold when internal current source of 100uA is used */
+       u32 vref_btn_cs[MBHC_MAX_BUTTONS];
+       /* Voltage threshold when microphone bias is ON */
+       u32 vref_btn_micb[MBHC_MAX_BUTTONS];
        unsigned int micbias1_cap_mode;
        unsigned int micbias2_cap_mode;
        unsigned int micbias_mv;
@@ -366,6 +436,97 @@ static int pm8916_wcd_analog_enable_micbias_int1(struct
                                                     wcd->micbias1_cap_mode);
 }
 
+static void pm8916_wcd_setup_mbhc(struct pm8916_wcd_analog_priv *wcd)
+{
+       struct snd_soc_codec *codec = wcd->codec;
+       u32 plug_type = 0;
+       u32 int_en_mask;
+
+       snd_soc_write(codec, CDC_A_MBHC_DET_CTL_1,
+                     CDC_A_MBHC_DET_CTL_L_DET_EN |
+                     CDC_A_MBHC_DET_CTL_MECH_DET_TYPE_INSERTION |
+                     CDC_A_MBHC_DET_CTL_MIC_CLAMP_CTL_AUTO |
+                     CDC_A_MBHC_DET_CTL_MBHC_BIAS_EN);
+
+       if (wcd->hphl_jack_type_normally_open)
+               plug_type |= CDC_A_HPHL_PLUG_TYPE_NO;
+
+       if (wcd->gnd_jack_type_normally_open)
+               plug_type |= CDC_A_GND_PLUG_TYPE_NO;
+
+       snd_soc_write(codec, CDC_A_MBHC_DET_CTL_2,
+                     CDC_A_MBHC_DET_CTL_HS_L_DET_PULL_UP_CTRL_I_3P0 |
+                     CDC_A_MBHC_DET_CTL_HS_L_DET_COMPA_CTRL_V0P9_VDD |
+                     plug_type |
+                     CDC_A_MBHC_DET_CTL_HPHL_100K_TO_GND_EN);
+
+
+       snd_soc_write(codec, CDC_A_MBHC_DBNC_TIMER,
+                     CDC_A_MBHC_DBNC_TIMER_INSREM_DBNC_T_256_MS |
+                     CDC_A_MBHC_DBNC_TIMER_BTN_DBNC_T_16MS);
+
+       /* enable MBHC clock */
+       snd_soc_update_bits(codec, CDC_D_CDC_DIG_CLK_CTL,
+                           DIG_CLK_CTL_D_MBHC_CLK_EN_MASK,
+                           DIG_CLK_CTL_D_MBHC_CLK_EN);
+
+       int_en_mask = MBHC_SWITCH_INT;
+       if (wcd->mbhc_btn_enabled)
+               int_en_mask |= MBHC_BUTTON_PRESS_DET | MBHC_BUTTON_RELEASE_DET;
+
+       snd_soc_update_bits(codec, CDC_D_INT_EN_CLR, int_en_mask, 0);
+       snd_soc_update_bits(codec, CDC_D_INT_EN_SET, int_en_mask, int_en_mask);
+       wcd->mbhc_btn0_pressed = false;
+       wcd->detect_accessory_type = true;
+}
+
+static int pm8916_mbhc_configure_bias(struct pm8916_wcd_analog_priv *priv,
+                                     bool micbias2_enabled)
+{
+       struct snd_soc_codec *codec = priv->codec;
+       u32 coarse, fine, reg_val, reg_addr;
+       int *vrefs, i;
+
+       if (!micbias2_enabled) { /* use internal 100uA Current source */
+               /* Enable internal 2.2k Internal Rbias Resistor */
+               snd_soc_update_bits(codec, CDC_A_MICB_1_INT_RBIAS,
+                                   MICB_1_INT_TX2_INT_RBIAS_EN_MASK,
+                                   MICB_1_INT_TX2_INT_RBIAS_EN_ENABLE);
+               /* Remove pull down on MIC BIAS2 */
+               snd_soc_update_bits(codec, CDC_A_MICB_2_EN,
+                                  CDC_A_MICB_2_PULL_DOWN_EN_MASK,
+                                  0);
+               /* enable 100uA internal current source */
+               snd_soc_update_bits(codec, CDC_A_MBHC_FSM_CTL,
+                                   CDC_A_MBHC_FSM_CTL_BTN_ISRC_CTRL_MASK,
+                                   CDC_A_MBHC_FSM_CTL_BTN_ISRC_CTRL_I_100UA);
+       }
+       snd_soc_update_bits(codec, CDC_A_MBHC_FSM_CTL,
+                       CDC_A_MBHC_FSM_CTL_MBHC_FSM_EN_MASK,
+                       CDC_A_MBHC_FSM_CTL_MBHC_FSM_EN);
+
+       if (micbias2_enabled)
+               vrefs = &priv->vref_btn_micb[0];
+       else
+               vrefs = &priv->vref_btn_cs[0];
+
+       /* program vref ranges for all the buttons */
+       reg_addr = CDC_A_MBHC_BTN0_ZDET_CTL_0;
+       for (i = 0; i <  MBHC_MAX_BUTTONS; i++) {
+               /* split mv in to coarse parts of 100mv & fine parts of 12mv */
+               coarse = (vrefs[i] / 100);
+               fine = ((vrefs[i] % 100) / 12);
+               reg_val = (coarse << CDC_A_MBHC_BTN_VREF_COARSE_SHIFT) |
+                        (fine << CDC_A_MBHC_BTN_VREF_FINE_SHIFT);
+               snd_soc_update_bits(codec, reg_addr,
+                              CDC_A_MBHC_BTN_VREF_MASK,
+                              reg_val);
+               reg_addr++;
+       }
+
+       return 0;
+}
+
 static int pm8916_wcd_analog_enable_micbias_int2(struct
                                                  snd_soc_dapm_widget
                                                  *w, struct snd_kcontrol
@@ -374,6 +535,15 @@ static int pm8916_wcd_analog_enable_micbias_int2(struct
        struct snd_soc_codec *codec = snd_soc_dapm_to_codec(w->dapm);
        struct pm8916_wcd_analog_priv *wcd = snd_soc_codec_get_drvdata(codec);
 
+       switch (event) {
+       case SND_SOC_DAPM_POST_PMU:
+               pm8916_mbhc_configure_bias(wcd, true);
+               break;
+       case SND_SOC_DAPM_POST_PMD:
+               pm8916_mbhc_configure_bias(wcd, false);
+               break;
+       }
+
        return pm8916_wcd_analog_enable_micbias_int(codec, event, w->reg,
                                                     wcd->micbias2_cap_mode);
 }
@@ -541,9 +711,14 @@ static int pm8916_wcd_analog_probe(struct snd_soc_codec 
*codec)
                snd_soc_write(codec, wcd_reg_defaults_2_0[reg].reg,
                              wcd_reg_defaults_2_0[reg].def);
 
+       priv->codec = codec;
+
        snd_soc_update_bits(codec, CDC_D_CDC_RST_CTL,
                            RST_CTL_DIG_SW_RST_N_MASK,
                            RST_CTL_DIG_SW_RST_N_REMOVE_RESET);
+
+       pm8916_wcd_setup_mbhc(priv);
+
        return 0;
 }
 
@@ -742,11 +917,130 @@ static const struct snd_soc_dapm_widget 
pm8916_wcd_analog_dapm_widgets[] = {
        SND_SOC_DAPM_SUPPLY("A_MCLK2", CDC_D_CDC_TOP_CLK_CTL, 3, 0, NULL, 0),
 };
 
+static int pm8916_wcd_analog_set_jack(struct snd_soc_codec *codec,
+                                     struct snd_soc_jack *jack,
+                                     void *data)
+{
+       struct pm8916_wcd_analog_priv *wcd = snd_soc_codec_get_drvdata(codec);
+
+       wcd->jack = jack;
+
+       return 0;
+}
+
 static struct regmap *pm8916_get_regmap(struct device *dev)
 {
        return dev_get_regmap(dev->parent, NULL);
 }
 
+static irqreturn_t mbhc_btn_release_irq_handler(int irq, void *arg)
+{
+       struct pm8916_wcd_analog_priv *priv = arg;
+
+       if (priv->detect_accessory_type) {
+               struct snd_soc_codec *codec = priv->codec;
+               u32 val = snd_soc_read(codec, CDC_A_MBHC_RESULT_1);
+
+               /* check if its BTN0 thats released */
+               if ((val >= 0) && !(val & CDC_A_MBHC_RESULT_1_BTN_RESULT_MASK))
+                       priv->mbhc_btn0_pressed = false;
+
+       } else {
+               snd_soc_jack_report(priv->jack, 0, btn_mask);
+       }
+
+       return IRQ_HANDLED;
+}
+
+static irqreturn_t mbhc_btn_press_irq_handler(int irq, void *arg)
+{
+       struct pm8916_wcd_analog_priv *priv = arg;
+       struct snd_soc_codec *codec = priv->codec;
+       u32 btn_result;
+
+       btn_result = snd_soc_read(codec, CDC_A_MBHC_RESULT_1) &
+                                 CDC_A_MBHC_RESULT_1_BTN_RESULT_MASK;
+
+       switch (btn_result) {
+       case 0xf:
+               snd_soc_jack_report(priv->jack, SND_JACK_BTN_4, btn_mask);
+               break;
+       case 0x7:
+               snd_soc_jack_report(priv->jack, SND_JACK_BTN_3, btn_mask);
+               break;
+       case 0x3:
+               snd_soc_jack_report(priv->jack, SND_JACK_BTN_2, btn_mask);
+               break;
+       case 0x1:
+               snd_soc_jack_report(priv->jack, SND_JACK_BTN_1, btn_mask);
+               break;
+       case 0x0:
+               /* handle BTN_0 specially for type detection */
+               if (priv->detect_accessory_type)
+                       priv->mbhc_btn0_pressed = true;
+               else
+                       snd_soc_jack_report(priv->jack,
+                                           SND_JACK_BTN_0, btn_mask);
+               break;
+       default:
+               dev_err(codec->dev,
+                       "Unexpected button press result (%x)", btn_result);
+               break;
+       }
+
+       return IRQ_HANDLED;
+}
+
+
+static irqreturn_t pm8916_mbhc_switch_irq_handler(int irq, void *arg)
+{
+       struct pm8916_wcd_analog_priv *priv = arg;
+       struct snd_soc_codec *codec = priv->codec;
+       bool ins = false;
+
+       if (snd_soc_read(codec, CDC_A_MBHC_DET_CTL_1) &
+                               CDC_A_MBHC_DET_CTL_MECH_DET_TYPE_MASK)
+               ins = true;
+
+       /* Set the detection type appropriately */
+       snd_soc_update_bits(codec, CDC_A_MBHC_DET_CTL_1,
+                           CDC_A_MBHC_DET_CTL_MECH_DET_TYPE_MASK,
+                           (!ins << CDC_A_MBHC_DET_CTL_MECH_DET_TYPE_SHIFT));
+
+
+       if (ins) { /* hs insertion */
+               bool micbias_enabled = false;
+
+               if (snd_soc_read(codec, CDC_A_MICB_2_EN) &
+                               CDC_A_MICB_2_EN_ENABLE)
+                       micbias_enabled = true;
+
+               pm8916_mbhc_configure_bias(priv, micbias_enabled);
+
+               /*
+                * if only a btn0 press event is receive just before
+                * insert event then its a 3 pole headphone else if
+                * both press and release event received then its
+                * a headset.
+                */
+               if (priv->mbhc_btn0_pressed)
+                       snd_soc_jack_report(priv->jack,
+                                           SND_JACK_HEADPHONE, hs_jack_mask);
+               else
+                       snd_soc_jack_report(priv->jack,
+                                           SND_JACK_HEADSET, hs_jack_mask);
+
+               priv->detect_accessory_type = false;
+
+       } else { /* removal */
+               snd_soc_jack_report(priv->jack, 0, hs_jack_mask);
+               priv->detect_accessory_type = true;
+               priv->mbhc_btn0_pressed = false;
+       }
+
+       return IRQ_HANDLED;
+}
+
 static struct snd_soc_dai_driver pm8916_wcd_analog_dai[] = {
        [0] = {
               .name = "pm8916_wcd_analog_pdm_rx",
@@ -775,6 +1069,7 @@ static struct snd_soc_dai_driver pm8916_wcd_analog_dai[] = 
{
 static struct snd_soc_codec_driver pm8916_wcd_analog = {
        .probe = pm8916_wcd_analog_probe,
        .remove = pm8916_wcd_analog_remove,
+       .set_jack = pm8916_wcd_analog_set_jack,
        .get_regmap = pm8916_get_regmap,
        .component_driver = {
                .controls = pm8916_wcd_analog_snd_controls,
@@ -789,6 +1084,7 @@ static struct snd_soc_codec_driver pm8916_wcd_analog = {
 static int pm8916_wcd_analog_parse_dt(struct device *dev,
                                       struct pm8916_wcd_analog_priv *priv)
 {
+       int rval;
 
        if (of_property_read_bool(dev->of_node, "qcom,micbias1-ext-cap"))
                priv->micbias1_cap_mode = MICB_1_EN_EXT_BYP_CAP;
@@ -803,6 +1099,39 @@ static int pm8916_wcd_analog_parse_dt(struct device *dev,
        of_property_read_u32(dev->of_node, "qcom,micbias-lvl",
                             &priv->micbias_mv);
 
+       if (of_property_read_bool(dev->of_node,
+                                 "qcom,hphl-jack-type-normally-open"))
+               priv->hphl_jack_type_normally_open = true;
+       else
+               priv->hphl_jack_type_normally_open = false;
+
+       if (of_property_read_bool(dev->of_node,
+                                 "qcom,gnd-jack-type-normally-open"))
+               priv->gnd_jack_type_normally_open = true;
+       else
+               priv->gnd_jack_type_normally_open = false;
+
+       priv->mbhc_btn_enabled = true;
+       rval = of_property_read_u32_array(dev->of_node,
+                                         "qcom,mbhc-vthreshold-low",
+                                         &priv->vref_btn_cs[0],
+                                         MBHC_MAX_BUTTONS);
+       if (rval < 0) {
+               priv->mbhc_btn_enabled = false;
+       } else {
+               rval = of_property_read_u32_array(dev->of_node,
+                                                 "qcom,mbhc-vthreshold-high",
+                                                 &priv->vref_btn_micb[0],
+                                                 MBHC_MAX_BUTTONS);
+               if (rval < 0)
+                       priv->mbhc_btn_enabled = false;
+       }
+
+       if (!priv->mbhc_btn_enabled)
+               dev_err(dev,
+                       "DT property missing, MBHC btn detection disabled\n");
+
+
        return 0;
 }
 
@@ -810,7 +1139,7 @@ static int pm8916_wcd_analog_spmi_probe(struct 
platform_device *pdev)
 {
        struct pm8916_wcd_analog_priv *priv;
        struct device *dev = &pdev->dev;
-       int ret, i;
+       int ret, i, irq;
 
        priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
        if (!priv)
@@ -842,6 +1171,48 @@ static int pm8916_wcd_analog_spmi_probe(struct 
platform_device *pdev)
                return ret;
        }
 
+       irq = platform_get_irq_byname(pdev, "mbhc_switch_int");
+       if (irq < 0) {
+               dev_err(dev, "failed to get mbhc switch irq\n");
+               return irq;
+       }
+
+       ret = devm_request_irq(dev, irq, pm8916_mbhc_switch_irq_handler,
+                              IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
+                              IRQF_ONESHOT,
+                              "mbhc switch irq", priv);
+       if (ret)
+               dev_err(dev, "cannot request mbhc switch irq\n");
+
+       if (priv->mbhc_btn_enabled) {
+               irq = platform_get_irq_byname(pdev, "mbhc_but_press_det");
+               if (irq < 0) {
+                       dev_err(dev, "failed to get button press irq\n");
+                       return irq;
+               }
+
+               ret = devm_request_irq(dev, irq, mbhc_btn_press_irq_handler,
+                                      IRQF_TRIGGER_RISING |
+                                      IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+                                      "mbhc btn press irq", priv);
+               if (ret)
+                       dev_err(dev, "cannot request mbhc button press irq\n");
+
+               irq = platform_get_irq_byname(pdev, "mbhc_but_rel_det");
+               if (irq < 0) {
+                       dev_err(dev, "failed to get button release irq\n");
+                       return irq;
+               }
+
+               ret = devm_request_irq(dev, irq, mbhc_btn_release_irq_handler,
+                                      IRQF_TRIGGER_RISING |
+                                      IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+                                      "mbhc btn release irq", priv);
+               if (ret)
+                       dev_err(dev, "cannot request mbhc button release 
irq\n");
+
+       }
+
        dev_set_drvdata(dev, priv);
 
        return snd_soc_register_codec(dev, &pm8916_wcd_analog,
-- 
2.9.3

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