linux-kernel - [PATCH 5/5] extcon: arizona: Use regulated mode for microphone supply when detecting

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Message-Id: <1358957029-5421-5-git-send-email-broonie@opensource.wolfsonmicro.com>
Date:	Thu, 24 Jan 2013 00:03:49 +0800
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	MyungJoo Ham <myungjoo.ham@...sung.com>,
	Chanwoo Choi <cw00.choi@...sung.com>
Cc:	patches@...nsource.wolfsonmicro.com, linux-kernel@...r.kernel.org,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Subject: [PATCH 5/5] extcon: arizona: Use regulated mode for microphone supply when detecting

When starting microphone detection some headsets should be exposed to
the fully regulated microphone bias in order to ensure that they behave
in an optimal fashion.

Signed-off-by: Mark Brown <broonie@...nsource.wolfsonmicro.com>
---
 drivers/extcon/extcon-arizona.c |   62 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)

diff --git a/drivers/extcon/extcon-arizona.c b/drivers/extcon/extcon-arizona.c
index d7e1047..3aacacc 100644
--- a/drivers/extcon/extcon-arizona.c
+++ b/drivers/extcon/extcon-arizona.c
@@ -27,6 +27,8 @@
 #include <linux/regulator/consumer.h>
 #include <linux/extcon.h>
 
+#include <sound/soc.h>
+
 #include <linux/mfd/arizona/core.h>
 #include <linux/mfd/arizona/pdata.h>
 #include <linux/mfd/arizona/registers.h>
@@ -113,6 +115,40 @@ static void arizona_extcon_set_mode(struct arizona_extcon_info *info, int mode)
 	dev_dbg(arizona->dev, "Set jack polarity to %d\n", mode);
 }
 
+static void arizona_extcon_pulse_micbias(struct arizona_extcon_info *info)
+{
+	struct arizona *arizona = info->arizona;
+	const char *widget;
+	int ret;
+
+	if (arizona->dapm) {
+		switch (info->micd_modes[0].bias) {
+		case 1:
+			widget = "MICBIAS1";
+			break;
+		case 2:
+			widget = "MICBIAS2";
+			break;
+		case 3:
+			widget = "MICBIAS3";
+			break;
+		default:
+			widget = "MICVDD";
+			break;
+		}
+
+		ret = snd_soc_dapm_force_enable_pin(arizona->dapm, widget);
+		if (ret != 0)
+			dev_warn(arizona->dev, "Failed to enable %s: %d\n",
+				 widget, ret);
+
+		ret = snd_soc_dapm_disable_pin(arizona->dapm, widget);
+		if (ret != 0)
+			dev_warn(arizona->dev, "Failed to disable %s: %d\n",
+				 widget, ret);
+	}
+}
+
 static void arizona_start_mic(struct arizona_extcon_info *info)
 {
 	struct arizona *arizona = info->arizona;
@@ -122,6 +158,15 @@ static void arizona_start_mic(struct arizona_extcon_info *info)
 	/* Microphone detection can't use idle mode */
 	pm_runtime_get(info->dev);
 
+	if (info->detecting) {
+		ret = regulator_allow_bypass(info->micvdd, false);
+		if (ret != 0) {
+			dev_err(arizona->dev,
+				"Failed to regulate MICVDD: %d\n",
+				ret);
+		}
+	}
+
 	ret = regulator_enable(info->micvdd);
 	if (ret != 0) {
 		dev_err(arizona->dev, "Failed to enable MICVDD: %d\n",
@@ -151,6 +196,7 @@ static void arizona_stop_mic(struct arizona_extcon_info *info)
 {
 	struct arizona *arizona = info->arizona;
 	bool change;
+	int ret;
 
 	regmap_update_bits_check(arizona->regmap, ARIZONA_MIC_DETECT_1,
 				 ARIZONA_MICD_ENA, 0,
@@ -162,6 +208,12 @@ static void arizona_stop_mic(struct arizona_extcon_info *info)
 		regmap_write(arizona->regmap, 0x80, 0x0);
 	}
 
+	ret = regulator_allow_bypass(info->micvdd, true);
+	if (ret != 0) {
+		dev_err(arizona->dev, "Failed to bypass MICVDD: %d\n",
+			ret);
+	}
+
 	if (change) {
 		regulator_disable(info->micvdd);
 		pm_runtime_mark_last_busy(info->dev);
@@ -564,6 +616,8 @@ static void arizona_start_hpdet_acc_id(struct arizona_extcon_info *info)
 
 	info->hpdet_active = true;
 
+	arizona_extcon_pulse_micbias(info);
+
 	ret = regmap_update_bits(arizona->regmap, 0x225, 0x4000, 0x4000);
 	if (ret != 0)
 		dev_warn(arizona->dev, "Failed to do magic: %d\n", ret);
@@ -649,6 +703,13 @@ static irqreturn_t arizona_micdet(int irq, void *data)
 			dev_err(arizona->dev, "Headset report failed: %d\n",
 				ret);
 
+		/* Don't need to regulate for button detection */
+		ret = regulator_allow_bypass(info->micvdd, false);
+		if (ret != 0) {
+			dev_err(arizona->dev, "Failed to bypass MICVDD: %d\n",
+				ret);
+		}
+
 		info->mic = true;
 		info->detecting = false;
 		goto handled;
@@ -716,6 +777,7 @@ static irqreturn_t arizona_micdet(int irq, void *data)
 			input_report_key(info->input,
 					 arizona_lvl_to_key[i].report, 0);
 		input_sync(info->input);
+		arizona_extcon_pulse_micbias(info);
 	}
 
 handled:
-- 
1.7.10.4

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