ASoC: wm8994: Allow a delay between jack insertion and microphone detect

This can be used to provide some additional settling time to ensure that
we don't start microphone detection while the microphone pin is connected
to one of the headphone pins.

Signed-off-by: Mark Brown <[e-mail]>

include/linux/mfd/wm8994/pdata.h

···
         unsigned int lineout1fb:1;
         unsigned int lineout2fb:1;
 
+	/* Delay between detecting a jack and starting microphone
+	 * detect (specified in ms)
+	 */
+	int micdet_delay;
+
 	/* IRQ for microphone detection if brought out directly as a
 	 * signal.
 	 */

sound/soc/codecs/wm8994.c

···
 	}
 }
 
+/* Deferred mic detection to allow for extra settling time */
+static void wm1811_mic_work(struct work_struct *work)
+{
+	struct wm8994_priv *wm8994 = container_of(work, struct wm8994_priv,
+						  mic_work.work);
+	struct snd_soc_codec *codec = wm8994->hubs.codec;
+
+	pm_runtime_get_sync(codec->dev);
+
+	/* If required for an external cap force MICBIAS on */
+	if (wm8994->pdata->jd_ext_cap) {
+		snd_soc_dapm_force_enable_pin(&codec->dapm,
+					      "MICBIAS2");
+		snd_soc_dapm_sync(&codec->dapm);
+	}
+
+	mutex_lock(&wm8994->accdet_lock);
+
+	dev_dbg(codec->dev, "Starting mic detection\n");
+
+	/*
+	 * Start off measument of microphone impedence to find out
+	 * what's actually there.
+	 */
+	wm8994->mic_detecting = true;
+	wm1811_jackdet_set_mode(codec, WM1811_JACKDET_MODE_MIC);
+
+	snd_soc_update_bits(codec, WM8958_MIC_DETECT_1,
+			    WM8958_MICD_ENA, WM8958_MICD_ENA);
+
+	mutex_unlock(&wm8994->accdet_lock);
+
+	pm_runtime_put(codec->dev);
+}
+
 static irqreturn_t wm1811_jackdet_irq(int irq, void *data)
 {
 	struct wm8994_priv *wm8994 = data;
 	struct snd_soc_codec *codec = wm8994->hubs.codec;
-	int reg;
+	int reg, delay;
 	bool present;
 
 	pm_runtime_get_sync(codec->dev);
···
 		snd_soc_update_bits(codec, WM1811_JACKDET_CTRL,
 				    WM1811_JACKDET_DB, 0);
 
-		/*
-		 * Start off measument of microphone impedence to find
-		 * out what's actually there.
-		 */
-		wm8994->mic_detecting = true;
-		wm1811_jackdet_set_mode(codec, WM1811_JACKDET_MODE_MIC);
-
-		snd_soc_update_bits(codec, WM8958_MIC_DETECT_1,
-				    WM8958_MICD_ENA, WM8958_MICD_ENA);
+		delay = wm8994->pdata->micdet_delay;
+		schedule_delayed_work(&wm8994->mic_work,
+				      msecs_to_jiffies(delay));
 	} else {
 		dev_dbg(codec->dev, "Jack not detected\n");
+
+		cancel_delayed_work_sync(&wm8994->mic_work);
 
 		snd_soc_update_bits(codec, WM8958_MICBIAS2,
 				    WM8958_MICB2_DISCH, WM8958_MICB2_DISCH);
···
 
 	mutex_unlock(&wm8994->accdet_lock);
 
-	/* If required for an external cap force MICBIAS on */
-	if (wm8994->pdata->jd_ext_cap) {
-		if (present)
-			snd_soc_dapm_force_enable_pin(&codec->dapm,
-						      "MICBIAS2");
-		else
-			snd_soc_dapm_disable_pin(&codec->dapm, "MICBIAS2");
-	}
+	/* Turn off MICBIAS if it was on for an external cap */
+	if (wm8994->pdata->jd_ext_cap && !present)
+		snd_soc_dapm_disable_pin(&codec->dapm, "MICBIAS2");
 
 	if (present)
 		snd_soc_jack_report(wm8994->micdet[0].jack,
···
 	snd_soc_codec_set_cache_io(codec, 16, 16, SND_SOC_REGMAP);
 
 	mutex_init(&wm8994->accdet_lock);
-	INIT_DELAYED_WORK(&wm8994->mic_work, wm8994_mic_work);
 	INIT_DELAYED_WORK(&wm8994->jackdet_bootstrap,
 			  wm1811_jackdet_bootstrap);
+
+	switch (control->type) {
+	case WM8994:
+		INIT_DELAYED_WORK(&wm8994->mic_work, wm8994_mic_work);
+		break;
+	case WM1811:
+		INIT_DELAYED_WORK(&wm8994->mic_work, wm1811_mic_work);
+		break;
+	default:
+		break;
+	}
 
 	for (i = 0; i < ARRAY_SIZE(wm8994->fll_locked); i++)
 		init_completion(&wm8994->fll_locked[i]);