ASoC: Implement WM8350 headphone jack detection

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

3 files changed, 125 insertions, 0 deletions

diff --git a/include/linux/mfd/wm8350/audio.h b/include/linux/mfd/wm8350/audio.h
index af95a1d2f3a1..d899dc0223ba 100644
--- a/include/linux/mfd/wm8350/audio.h
+++ b/include/linux/mfd/wm8350/audio.h
@@ -490,6 +490,7 @@
 /*
  * R231 (0xE7) - Jack Status
  */
+#define WM8350_JACK_L_LVL                       0x0800
 #define WM8350_JACK_R_LVL                       0x0400
 
 /*
diff --git a/sound/soc/codecs/wm8350.c b/sound/soc/codecs/wm8350.c
index e3989d406f54..47a9dabb5235 100644
--- a/sound/soc/codecs/wm8350.c
+++ b/sound/soc/codecs/wm8350.c
@@ -51,10 +51,17 @@ struct wm8350_output {
         u16 mute;
 };
 
+struct wm8350_jack_data {
+        struct snd_soc_jack *jack;
+        int report;
+};
+
 struct wm8350_data {
         struct snd_soc_codec codec;
         struct wm8350_output out1;
         struct wm8350_output out2;
+        struct wm8350_jack_data hpl;
+        struct wm8350_jack_data hpr;
         struct regulator_bulk_data supplies[ARRAY_SIZE(supply_names)];
 };
 
@@ -1328,6 +1335,95 @@ static int wm8350_resume(struct platform_device *pdev)
         return 0;
 }
 
+static void wm8350_hp_jack_handler(struct wm8350 *wm8350, int irq, void *data)
+{
+        struct wm8350_data *priv = data;
+        u16 reg;
+        int report;
+        int mask;
+        struct wm8350_jack_data *jack = NULL;
+
+        switch (irq) {
+        case WM8350_IRQ_CODEC_JCK_DET_L:
+                jack = &priv->hpl;
+                mask = WM8350_JACK_L_LVL;
+                break;
+
+        case WM8350_IRQ_CODEC_JCK_DET_R:
+                jack = &priv->hpr;
+                mask = WM8350_JACK_R_LVL;
+                break;
+
+        default:
+                BUG();
+        }
+
+        if (!jack->jack) {
+                dev_warn(wm8350->dev, "Jack interrupt called with no jack\n");
+                return;
+        }
+
+        /* Debounce */
+        msleep(200);
+
+        reg = wm8350_reg_read(wm8350, WM8350_JACK_PIN_STATUS);
+        if (reg & mask)
+                report = jack->report;
+        else
+                report = 0;
+
+        snd_soc_jack_report(jack->jack, report, jack->report);
+}
+
+/**
+ * wm8350_hp_jack_detect - Enable headphone jack detection.
+ *
+ * @codec:  WM8350 codec
+ * @which:  left or right jack detect signal
+ * @jack:   jack to report detection events on
+ * @report: value to report
+ *
+ * Enables the headphone jack detection of the WM8350.
+ */
+int wm8350_hp_jack_detect(struct snd_soc_codec *codec, enum wm8350_jack which,
+                          struct snd_soc_jack *jack, int report)
+{
+        struct wm8350_data *priv = codec->private_data;
+        struct wm8350 *wm8350 = codec->control_data;
+        int irq;
+        int ena;
+
+        switch (which) {
+        case WM8350_JDL:
+                priv->hpl.jack = jack;
+                priv->hpl.report = report;
+                irq = WM8350_IRQ_CODEC_JCK_DET_L;
+                ena = WM8350_JDL_ENA;
+                break;
+
+        case WM8350_JDR:
+                priv->hpr.jack = jack;
+                priv->hpr.report = report;
+                irq = WM8350_IRQ_CODEC_JCK_DET_R;
+                ena = WM8350_JDR_ENA;
+                break;
+
+        default:
+                return -EINVAL;
+        }
+
+        wm8350_set_bits(wm8350, WM8350_POWER_MGMT_4, WM8350_TOCLK_ENA);
+        wm8350_set_bits(wm8350, WM8350_JACK_DETECT, ena);
+
+        /* Sync status */
+        wm8350_hp_jack_handler(wm8350, irq, priv);
+
+        wm8350_unmask_irq(wm8350, irq);
+
+        return 0;
+}
+EXPORT_SYMBOL_GPL(wm8350_hp_jack_detect);
+
 static struct snd_soc_codec *wm8350_codec;
 
 static int wm8350_probe(struct platform_device *pdev)
@@ -1381,6 +1477,13 @@ static int wm8350_probe(struct platform_device *pdev)
         wm8350_set_bits(wm8350, WM8350_ROUT2_VOLUME,
                         WM8350_OUT2_VU | WM8350_OUT2R_MUTE);
 
+        wm8350_mask_irq(wm8350, WM8350_IRQ_CODEC_JCK_DET_L);
+        wm8350_mask_irq(wm8350, WM8350_IRQ_CODEC_JCK_DET_R);
+        wm8350_register_irq(wm8350, WM8350_IRQ_CODEC_JCK_DET_L,
+                            wm8350_hp_jack_handler, priv);
+        wm8350_register_irq(wm8350, WM8350_IRQ_CODEC_JCK_DET_R,
+                            wm8350_hp_jack_handler, priv);
+
         ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
         if (ret < 0) {
                 dev_err(&pdev->dev, "failed to create pcms\n");
@@ -1411,8 +1514,21 @@ static int wm8350_remove(struct platform_device *pdev)
         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
         struct snd_soc_codec *codec = socdev->codec;
         struct wm8350 *wm8350 = codec->control_data;
+        struct wm8350_data *priv = codec->private_data;
         int ret;
 
+        wm8350_clear_bits(wm8350, WM8350_JACK_DETECT,
+                          WM8350_JDL_ENA | WM8350_JDR_ENA);
+        wm8350_clear_bits(wm8350, WM8350_POWER_MGMT_4, WM8350_TOCLK_ENA);
+
+        wm8350_mask_irq(wm8350, WM8350_IRQ_CODEC_JCK_DET_L);
+        wm8350_mask_irq(wm8350, WM8350_IRQ_CODEC_JCK_DET_R);
+        wm8350_free_irq(wm8350, WM8350_IRQ_CODEC_JCK_DET_L);
+        wm8350_free_irq(wm8350, WM8350_IRQ_CODEC_JCK_DET_R);
+
+        priv->hpl.jack = NULL;
+        priv->hpr.jack = NULL;
+
         /* cancel any work waiting to be queued. */
         ret = cancel_delayed_work(&codec->delayed_work);
 
diff --git a/sound/soc/codecs/wm8350.h b/sound/soc/codecs/wm8350.h
index cc2887aa6c38..d11bd9288cf9 100644
--- a/sound/soc/codecs/wm8350.h
+++ b/sound/soc/codecs/wm8350.h
@@ -17,4 +17,12 @@
 extern struct snd_soc_dai wm8350_dai;
 extern struct snd_soc_codec_device soc_codec_dev_wm8350;
 
+enum wm8350_jack {
+        WM8350_JDL = 1,
+        WM8350_JDR = 2,
+};
+
+int wm8350_hp_jack_detect(struct snd_soc_codec *codec, enum wm8350_jack which,
+                          struct snd_soc_jack *jack, int report);
+
 #endif