ASoC: max98095: add jack detection

This change adds the logic to support using the jack detect mechanism built
in to the codec to detect both when a jack was inserted and what type of
jack is present.

This change also supports the use of an external mechanism for headphone
detection. If this mechanism exists, when the max98095_jack_detect function
is called, the hp_jack is simply passed NULL.

This change supports both simple headphones, powered headphones, microphones
and headsets with both headphones and a mic.

Signed-off-by: Rhyland Klein <rklein@nvidia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

2 files changed, 179 insertions, 1 deletions

diff --git a/sound/soc/codecs/max98095.c b/sound/soc/codecs/max98095.c
index 0bb511a0388d..0752840e01c2 100644
--- a/sound/soc/codecs/max98095.c
+++ b/sound/soc/codecs/max98095.c
@@ -24,6 +24,7 @@
 #include <linux/slab.h>
 #include <asm/div64.h>
 #include <sound/max98095.h>
+#include <sound/jack.h>
 #include "max98095.h"
 
 enum max98095_type {
@@ -51,6 +52,8 @@ struct max98095_priv {
         u8 lin_state;
         unsigned int mic1pre;
         unsigned int mic2pre;
+        struct snd_soc_jack *headphone_jack;
+        struct snd_soc_jack *mic_jack;
 };
 
 static const u8 max98095_reg_def[M98095_REG_CNT] = {
@@ -2173,9 +2176,125 @@ static void max98095_handle_pdata(struct snd_soc_codec *codec)
                 max98095_handle_bq_pdata(codec);
 }
 
+static irqreturn_t max98095_report_jack(int irq, void *data)
+{
+        struct snd_soc_codec *codec = data;
+        struct max98095_priv *max98095 = snd_soc_codec_get_drvdata(codec);
+        unsigned int value;
+        int hp_report = 0;
+        int mic_report = 0;
+
+        /* Read the Jack Status Register */
+        value = snd_soc_read(codec, M98095_007_JACK_AUTO_STS);
+
+        /* If ddone is not set, then detection isn't finished yet */
+        if ((value & M98095_DDONE) == 0)
+                return IRQ_NONE;
+
+        /* if hp, check its bit, and if set, clear it */
+        if ((value & M98095_HP_IN || value & M98095_LO_IN) &&
+                max98095->headphone_jack)
+                hp_report |= SND_JACK_HEADPHONE;
+
+        /* if mic, check its bit, and if set, clear it */
+        if ((value & M98095_MIC_IN) && max98095->mic_jack)
+                mic_report |= SND_JACK_MICROPHONE;
+
+        if (max98095->headphone_jack == max98095->mic_jack) {
+                snd_soc_jack_report(max98095->headphone_jack,
+                                        hp_report | mic_report,
+                                        SND_JACK_HEADSET);
+        } else {
+                if (max98095->headphone_jack)
+                        snd_soc_jack_report(max98095->headphone_jack,
+                                        hp_report, SND_JACK_HEADPHONE);
+                if (max98095->mic_jack)
+                        snd_soc_jack_report(max98095->mic_jack,
+                                        mic_report, SND_JACK_MICROPHONE);
+        }
+
+        return IRQ_HANDLED;
+}
+
+int max98095_jack_detect_enable(struct snd_soc_codec *codec)
+{
+        struct max98095_priv *max98095 = snd_soc_codec_get_drvdata(codec);
+        int ret = 0;
+        int detect_enable = M98095_JDEN;
+        unsigned int slew = M98095_DEFAULT_SLEW_DELAY;
+
+        if (max98095->pdata->jack_detect_pin5en)
+                detect_enable |= M98095_PIN5EN;
+
+        if (max98095->jack_detect_delay)
+                slew = max98095->jack_detect_delay;
+
+        ret = snd_soc_write(codec, M98095_08E_JACK_DC_SLEW, slew);
+        if (ret < 0) {
+                dev_err(codec->dev, "Failed to cfg auto detect %d\n", ret);
+                return ret;
+        }
+
+        /* configure auto detection to be enabled */
+        ret = snd_soc_write(codec, M98095_089_JACK_DET_AUTO, detect_enable);
+        if (ret < 0) {
+                dev_err(codec->dev, "Failed to cfg auto detect %d\n", ret);
+                return ret;
+        }
+
+        return ret;
+}
+
+int max98095_jack_detect_disable(struct snd_soc_codec *codec)
+{
+        int ret = 0;
+
+        /* configure auto detection to be disabled */
+        ret = snd_soc_write(codec, M98095_089_JACK_DET_AUTO, 0x0);
+        if (ret < 0) {
+                dev_err(codec->dev, "Failed to cfg auto detect %d\n", ret);
+                return ret;
+        }
+
+        return ret;
+}
+
+int max98095_jack_detect(struct snd_soc_codec *codec,
+        struct snd_soc_jack *hp_jack, struct snd_soc_jack *mic_jack)
+{
+        struct max98095_priv *max98095 = snd_soc_codec_get_drvdata(codec);
+        struct i2c_client *client = to_i2c_client(codec->dev);
+        int ret = 0;
+
+        max98095->headphone_jack = hp_jack;
+        max98095->mic_jack = mic_jack;
+
+        /* only progress if we have at least 1 jack pointer */
+        if (!hp_jack && !mic_jack)
+                return -EINVAL;
+
+        max98095_jack_detect_enable(codec);
+
+        /* enable interrupts for headphone jack detection */
+        ret = snd_soc_update_bits(codec, M98095_013_JACK_INT_EN,
+                M98095_IDDONE, M98095_IDDONE);
+        if (ret < 0) {
+                dev_err(codec->dev, "Failed to cfg jack irqs %d\n", ret);
+                return ret;
+        }
+
+        max98095_report_jack(client->irq, codec);
+        return 0;
+}
+
 #ifdef CONFIG_PM
 static int max98095_suspend(struct snd_soc_codec *codec)
 {
+        struct max98095_priv *max98095 = snd_soc_codec_get_drvdata(codec);
+
+        if (max98095->headphone_jack || max98095->mic_jack)
+                max98095_jack_detect_disable(codec);
+
         max98095_set_bias_level(codec, SND_SOC_BIAS_OFF);
 
         return 0;
@@ -2183,8 +2302,16 @@ static int max98095_suspend(struct snd_soc_codec *codec)
 
 static int max98095_resume(struct snd_soc_codec *codec)
 {
+        struct max98095_priv *max98095 = snd_soc_codec_get_drvdata(codec);
+        struct i2c_client *client = to_i2c_client(codec->dev);
+
         max98095_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
 
+        if (max98095->headphone_jack || max98095->mic_jack) {
+                max98095_jack_detect_enable(codec);
+                max98095_report_jack(client->irq, codec);
+        }
+
         return 0;
 }
 #else
@@ -2227,6 +2354,7 @@ static int max98095_probe(struct snd_soc_codec *codec)
 {
         struct max98095_priv *max98095 = snd_soc_codec_get_drvdata(codec);
         struct max98095_cdata *cdata;
+        struct i2c_client *client;
         int ret = 0;
 
         ret = snd_soc_codec_set_cache_io(codec, 8, 8, SND_SOC_I2C);
@@ -2238,6 +2366,8 @@ static int max98095_probe(struct snd_soc_codec *codec)
         /* reset the codec, the DSP core, and disable all interrupts */
         max98095_reset(codec);
 
+        client = to_i2c_client(codec->dev);
+
         /* initialize private data */
 
         max98095->sysclk = (unsigned)-1;
@@ -2266,11 +2396,23 @@ static int max98095_probe(struct snd_soc_codec *codec)
         max98095->mic1pre = 0;
         max98095->mic2pre = 0;
 
+        if (client->irq) {
+                /* register an audio interrupt */
+                ret = request_threaded_irq(client->irq, NULL,
+                        max98095_report_jack,
+                        IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
+                        "max98095", codec);
+                if (ret) {
+                        dev_err(codec->dev, "Failed to request IRQ: %d\n", ret);
+                        goto err_access;
+                }
+        }
+
         ret = snd_soc_read(codec, M98095_0FF_REV_ID);
         if (ret < 0) {
                 dev_err(codec->dev, "Failure reading hardware revision: %d\n",
                         ret);
-                goto err_access;
+                goto err_irq;
         }
         dev_info(codec->dev, "Hardware revision: %c\n", ret - 0x40 + 'A');
 
@@ -2306,14 +2448,28 @@ static int max98095_probe(struct snd_soc_codec *codec)
 
         max98095_add_widgets(codec);
 
+        return 0;
+
+err_irq:
+        if (client->irq)
+                free_irq(client->irq, codec);
 err_access:
         return ret;
 }
 
 static int max98095_remove(struct snd_soc_codec *codec)
 {
+        struct max98095_priv *max98095 = snd_soc_codec_get_drvdata(codec);
+        struct i2c_client *client = to_i2c_client(codec->dev);
+
         max98095_set_bias_level(codec, SND_SOC_BIAS_OFF);
 
+        if (max98095->headphone_jack || max98095->mic_jack)
+                max98095_jack_detect_disable(codec);
+
+        if (client->irq)
+                free_irq(client->irq, codec);
+
         return 0;
 }
 
diff --git a/sound/soc/codecs/max98095.h b/sound/soc/codecs/max98095.h
index 891584a0eb03..2ebbe4e894bf 100644
--- a/sound/soc/codecs/max98095.h
+++ b/sound/soc/codecs/max98095.h
@@ -175,11 +175,23 @@
 
 /* MAX98095 Registers Bit Fields */
 
+/* M98095_007_JACK_AUTO_STS */
+        #define M98095_MIC_IN                   (1<<3)
+        #define M98095_LO_IN                    (1<<5)
+        #define M98095_HP_IN                    (1<<6)
+        #define M98095_DDONE                    (1<<7)
+
 /* M98095_00F_HOST_CFG */
         #define M98095_SEG                      (1<<0)
         #define M98095_XTEN                     (1<<1)
         #define M98095_MDLLEN                   (1<<2)
 
+/* M98095_013_JACK_INT_EN */
+        #define M98095_IMIC_IN                  (1<<3)
+        #define M98095_ILO_IN                   (1<<5)
+        #define M98095_IHP_IN                   (1<<6)
+        #define M98095_IDDONE                   (1<<7)
+
 /* M98095_027_DAI1_CLKMODE, M98095_031_DAI2_CLKMODE, M98095_03B_DAI3_CLKMODE */
         #define M98095_CLKMODE_MASK             0xFF
 
@@ -255,6 +267,10 @@
         #define M98095_EQ2EN                    (1<<1)
         #define M98095_EQ1EN                    (1<<0)
 
+/* M98095_089_JACK_DET_AUTO */
+        #define M98095_PIN5EN                   (1<<2)
+        #define M98095_JDEN                     (1<<7)
+
 /* M98095_090_PWR_EN_IN */
         #define M98095_INEN                     (1<<7)
         #define M98095_MB2EN                    (1<<3)
@@ -296,4 +312,10 @@
 #define M98095_174_DAI1_BQ_BASE             0x74
 #define M98095_17E_DAI2_BQ_BASE             0x7E
 
+/* Default Delay used in Slew Rate Calculation for Jack detection */
+#define M98095_DEFAULT_SLEW_DELAY               0x18
+
+extern int max98095_jack_detect(struct snd_soc_codec *codec,
+        struct snd_soc_jack *hp_jack, struct snd_soc_jack *mic_jack);
+
 #endif