1 files changed, 490 insertions, 0 deletions

diff --git a/drivers/extcon/extcon-arizona.c b/drivers/extcon/extcon-arizona.c
new file mode 100644
index 0000000..427a289
--- /dev/null
+++ b/drivers/extcon/extcon-arizona.c
@@ -0,0 +1,490 @@
+/*
+ * extcon-arizona.c - Extcon driver Wolfson Arizona devices
+ *
+ *  Copyright (C) 2012 Wolfson Microelectronics plc
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/err.h>
+#include <linux/gpio.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/regulator/consumer.h>
+#include <linux/extcon.h>
+
+#include <linux/mfd/arizona/core.h>
+#include <linux/mfd/arizona/pdata.h>
+#include <linux/mfd/arizona/registers.h>
+
+struct arizona_extcon_info {
+	struct device *dev;
+	struct arizona *arizona;
+	struct mutex lock;
+	struct regulator *micvdd;
+
+	int micd_mode;
+	const struct arizona_micd_config *micd_modes;
+	int micd_num_modes;
+
+	bool micd_reva;
+
+	bool mic;
+	bool detecting;
+	int jack_flips;
+
+	struct extcon_dev edev;
+};
+
+static const struct arizona_micd_config micd_default_modes[] = {
+	{ ARIZONA_ACCDET_SRC, 1 << ARIZONA_MICD_BIAS_SRC_SHIFT, 0 },
+	{ 0,                  2 << ARIZONA_MICD_BIAS_SRC_SHIFT, 1 },
+};
+
+#define ARIZONA_CABLE_MECHANICAL 0
+#define ARIZONA_CABLE_MICROPHONE 1
+#define ARIZONA_CABLE_HEADPHONE  2
+
+static const char *arizona_cable[] = {
+	"Mechanical",
+	"Microphone",
+	"Headphone",
+	NULL,
+};
+
+static void arizona_extcon_set_mode(struct arizona_extcon_info *info, int mode)
+{
+	struct arizona *arizona = info->arizona;
+
+	gpio_set_value_cansleep(arizona->pdata.micd_pol_gpio,
+				info->micd_modes[mode].gpio);
+	regmap_update_bits(arizona->regmap, ARIZONA_MIC_DETECT_1,
+			   ARIZONA_MICD_BIAS_SRC_MASK,
+			   info->micd_modes[mode].bias);
+	regmap_update_bits(arizona->regmap, ARIZONA_ACCESSORY_DETECT_MODE_1,
+			   ARIZONA_ACCDET_SRC, info->micd_modes[mode].src);
+
+	info->micd_mode = mode;
+
+	dev_dbg(arizona->dev, "Set jack polarity to %d\n", mode);
+}
+
+static void arizona_start_mic(struct arizona_extcon_info *info)
+{
+	struct arizona *arizona = info->arizona;
+	bool change;
+	int ret;
+
+	info->detecting = true;
+	info->mic = false;
+	info->jack_flips = 0;
+
+	/* Microphone detection can't use idle mode */
+	pm_runtime_get(info->dev);
+
+	ret = regulator_enable(info->micvdd);
+	if (ret != 0) {
+		dev_err(arizona->dev, "Failed to enable MICVDD: %d\n",
+			ret);
+	}
+
+	if (info->micd_reva) {
+		regmap_write(arizona->regmap, 0x80, 0x3);
+		regmap_write(arizona->regmap, 0x294, 0);
+		regmap_write(arizona->regmap, 0x80, 0x0);
+	}
+
+	regmap_update_bits_check(arizona->regmap, ARIZONA_MIC_DETECT_1,
+				 ARIZONA_MICD_ENA, ARIZONA_MICD_ENA,
+				 &change);
+	if (!change) {
+		regulator_disable(info->micvdd);
+		pm_runtime_put_autosuspend(info->dev);
+	}
+}
+
+static void arizona_stop_mic(struct arizona_extcon_info *info)
+{
+	struct arizona *arizona = info->arizona;
+	bool change;
+
+	regmap_update_bits_check(arizona->regmap, ARIZONA_MIC_DETECT_1,
+				 ARIZONA_MICD_ENA, 0,
+				 &change);
+
+	if (info->micd_reva) {
+		regmap_write(arizona->regmap, 0x80, 0x3);
+		regmap_write(arizona->regmap, 0x294, 2);
+		regmap_write(arizona->regmap, 0x80, 0x0);
+	}
+
+	if (change) {
+		regulator_disable(info->micvdd);
+		pm_runtime_put_autosuspend(info->dev);
+	}
+}
+
+static irqreturn_t arizona_micdet(int irq, void *data)
+{
+	struct arizona_extcon_info *info = data;
+	struct arizona *arizona = info->arizona;
+	unsigned int val;
+	int ret;
+
+	mutex_lock(&info->lock);
+
+	ret = regmap_read(arizona->regmap, ARIZONA_MIC_DETECT_3, &val);
+	if (ret != 0) {
+		dev_err(arizona->dev, "Failed to read MICDET: %d\n", ret);
+		return IRQ_NONE;
+	}
+
+	dev_dbg(arizona->dev, "MICDET: %x\n", val);
+
+	if (!(val & ARIZONA_MICD_VALID)) {
+		dev_warn(arizona->dev, "Microphone detection state invalid\n");
+		mutex_unlock(&info->lock);
+		return IRQ_NONE;
+	}
+
+	/* Due to jack detect this should never happen */
+	if (!(val & ARIZONA_MICD_STS)) {
+		dev_warn(arizona->dev, "Detected open circuit\n");
+		info->detecting = false;
+		goto handled;
+	}
+
+	/* If we got a high impedence we should have a headset, report it. */
+	if (info->detecting && (val & 0x400)) {
+		ret = extcon_update_state(&info->edev,
+					  1 << ARIZONA_CABLE_MICROPHONE |
+					  1 << ARIZONA_CABLE_HEADPHONE,
+					  1 << ARIZONA_CABLE_MICROPHONE |
+					  1 << ARIZONA_CABLE_HEADPHONE);
+
+		if (ret != 0)
+			dev_err(arizona->dev, "Headset report failed: %d\n",
+				ret);
+
+		info->mic = true;
+		info->detecting = false;
+		goto handled;
+	}
+
+	/* If we detected a lower impedence during initial startup
+	 * then we probably have the wrong polarity, flip it.  Don't
+	 * do this for the lowest impedences to speed up detection of
+	 * plain headphones.  If both polarities report a low
+	 * impedence then give up and report headphones.
+	 */
+	if (info->detecting && (val & 0x3f8)) {
+		info->jack_flips++;
+
+		if (info->jack_flips >= info->micd_num_modes) {
+			dev_dbg(arizona->dev, "Detected headphone\n");
+			info->detecting = false;
+			arizona_stop_mic(info);
+
+			ret = extcon_set_cable_state_(&info->edev,
+						      ARIZONA_CABLE_HEADPHONE,
+						      true);
+			if (ret != 0)
+				dev_err(arizona->dev,
+					"Headphone report failed: %d\n",
+				ret);
+		} else {
+			info->micd_mode++;
+			if (info->micd_mode == info->micd_num_modes)
+				info->micd_mode = 0;
+			arizona_extcon_set_mode(info, info->micd_mode);
+
+			info->jack_flips++;
+		}
+
+		goto handled;
+	}
+
+	/*
+	 * If we're still detecting and we detect a short then we've
+	 * got a headphone.  Otherwise it's a button press, the
+	 * button reporting is stubbed out for now.
+	 */
+	if (val & 0x3fc) {
+		if (info->mic) {
+			dev_dbg(arizona->dev, "Mic button detected\n");
+
+		} else if (info->detecting) {
+			dev_dbg(arizona->dev, "Headphone detected\n");
+			info->detecting = false;
+			arizona_stop_mic(info);
+
+			ret = extcon_set_cable_state_(&info->edev,
+						      ARIZONA_CABLE_HEADPHONE,
+						      true);
+			if (ret != 0)
+				dev_err(arizona->dev,
+					"Headphone report failed: %d\n",
+				ret);
+		} else {
+			dev_warn(arizona->dev, "Button with no mic: %x\n",
+				 val);
+		}
+	} else {
+		dev_dbg(arizona->dev, "Mic button released\n");
+	}
+
+handled:
+	pm_runtime_mark_last_busy(info->dev);
+	mutex_unlock(&info->lock);
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t arizona_jackdet(int irq, void *data)
+{
+	struct arizona_extcon_info *info = data;
+	struct arizona *arizona = info->arizona;
+	unsigned int val;
+	int ret;
+
+	pm_runtime_get_sync(info->dev);
+
+	mutex_lock(&info->lock);
+
+	ret = regmap_read(arizona->regmap, ARIZONA_AOD_IRQ_RAW_STATUS, &val);
+	if (ret != 0) {
+		dev_err(arizona->dev, "Failed to read jackdet status: %d\n",
+			ret);
+		mutex_unlock(&info->lock);
+		pm_runtime_put_autosuspend(info->dev);
+		return IRQ_NONE;
+	}
+
+	if (val & ARIZONA_JD1_STS) {
+		dev_dbg(arizona->dev, "Detected jack\n");
+		ret = extcon_set_cable_state_(&info->edev,
+					      ARIZONA_CABLE_MECHANICAL, true);
+
+		if (ret != 0)
+			dev_err(arizona->dev, "Mechanical report failed: %d\n",
+				ret);
+
+		arizona_start_mic(info);
+	} else {
+		dev_dbg(arizona->dev, "Detected jack removal\n");
+
+		arizona_stop_mic(info);
+
+		ret = extcon_update_state(&info->edev, 0xffffffff, 0);
+		if (ret != 0)
+			dev_err(arizona->dev, "Removal report failed: %d\n",
+				ret);
+	}
+
+	mutex_unlock(&info->lock);
+
+	pm_runtime_mark_last_busy(info->dev);
+	pm_runtime_put_autosuspend(info->dev);
+
+	return IRQ_HANDLED;
+}
+
+static int __devinit arizona_extcon_probe(struct platform_device *pdev)
+{
+	struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
+	struct arizona_pdata *pdata;
+	struct arizona_extcon_info *info;
+	int ret, mode;
+
+	pdata = dev_get_platdata(arizona->dev);
+
+	info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
+	if (!info) {
+		dev_err(&pdev->dev, "failed to allocate memory\n");
+		ret = -ENOMEM;
+		goto err;
+	}
+
+	info->micvdd = devm_regulator_get(arizona->dev, "MICVDD");
+	if (IS_ERR(info->micvdd)) {
+		ret = PTR_ERR(info->micvdd);
+		dev_err(arizona->dev, "Failed to get MICVDD: %d\n", ret);
+		goto err;
+	}
+
+	mutex_init(&info->lock);
+	info->arizona = arizona;
+	info->dev = &pdev->dev;
+	info->detecting = true;
+	platform_set_drvdata(pdev, info);
+
+	switch (arizona->type) {
+	case WM5102:
+		switch (arizona->rev) {
+		case 0:
+			info->micd_reva = true;
+			break;
+		default:
+			break;
+		}
+		break;
+	default:
+		break;
+	}
+
+	info->edev.name = "Headset Jack";
+	info->edev.supported_cable = arizona_cable;
+
+	ret = extcon_dev_register(&info->edev, arizona->dev);
+	if (ret < 0) {
+		dev_err(arizona->dev, "extcon_dev_regster() failed: %d\n",
+			ret);
+		goto err;
+	}
+
+	if (pdata->num_micd_configs) {
+		info->micd_modes = pdata->micd_configs;
+		info->micd_num_modes = pdata->num_micd_configs;
+	} else {
+		info->micd_modes = micd_default_modes;
+		info->micd_num_modes = ARRAY_SIZE(micd_default_modes);
+	}
+
+	if (arizona->pdata.micd_pol_gpio > 0) {
+		if (info->micd_modes[0].gpio)
+			mode = GPIOF_OUT_INIT_HIGH;
+		else
+			mode = GPIOF_OUT_INIT_LOW;
+
+		ret = devm_gpio_request_one(&pdev->dev,
+					    arizona->pdata.micd_pol_gpio,
+					    mode,
+					    "MICD polarity");
+		if (ret != 0) {
+			dev_err(arizona->dev, "Failed to request GPIO%d: %d\n",
+				arizona->pdata.micd_pol_gpio, ret);
+			goto err_register;
+		}
+	}
+
+	arizona_extcon_set_mode(info, 0);
+
+	pm_runtime_enable(&pdev->dev);
+	pm_runtime_idle(&pdev->dev);
+	pm_runtime_get_sync(&pdev->dev);
+
+	ret = arizona_request_irq(arizona, ARIZONA_IRQ_JD_RISE,
+				  "JACKDET rise", arizona_jackdet, info);
+	if (ret != 0) {
+		dev_err(&pdev->dev, "Failed to get JACKDET rise IRQ: %d\n",
+			ret);
+		goto err_register;
+	}
+
+	ret = arizona_set_irq_wake(arizona, ARIZONA_IRQ_JD_RISE, 1);
+	if (ret != 0) {
+		dev_err(&pdev->dev, "Failed to set JD rise IRQ wake: %d\n",
+			ret);
+		goto err_rise;
+	}
+
+	ret = arizona_request_irq(arizona, ARIZONA_IRQ_JD_FALL,
+				  "JACKDET fall", arizona_jackdet, info);
+	if (ret != 0) {
+		dev_err(&pdev->dev, "Failed to get JD fall IRQ: %d\n", ret);
+		goto err_rise_wake;
+	}
+
+	ret = arizona_set_irq_wake(arizona, ARIZONA_IRQ_JD_FALL, 1);
+	if (ret != 0) {
+		dev_err(&pdev->dev, "Failed to set JD fall IRQ wake: %d\n",
+			ret);
+		goto err_fall;
+	}
+
+	ret = arizona_request_irq(arizona, ARIZONA_IRQ_MICDET,
+				  "MICDET", arizona_micdet, info);
+	if (ret != 0) {
+		dev_err(&pdev->dev, "Failed to get MICDET IRQ: %d\n", ret);
+		goto err_fall_wake;
+	}
+
+	regmap_update_bits(arizona->regmap, ARIZONA_MIC_DETECT_1,
+			   ARIZONA_MICD_BIAS_STARTTIME_MASK |
+			   ARIZONA_MICD_RATE_MASK,
+			   7 << ARIZONA_MICD_BIAS_STARTTIME_SHIFT |
+			   8 << ARIZONA_MICD_RATE_SHIFT);
+
+	arizona_clk32k_enable(arizona);
+	regmap_update_bits(arizona->regmap, ARIZONA_JACK_DETECT_DEBOUNCE,
+			   ARIZONA_JD1_DB, ARIZONA_JD1_DB);
+	regmap_update_bits(arizona->regmap, ARIZONA_JACK_DETECT_ANALOGUE,
+			   ARIZONA_JD1_ENA, ARIZONA_JD1_ENA);
+
+	pm_runtime_put(&pdev->dev);
+
+	return 0;
+
+err_fall_wake:
+	arizona_set_irq_wake(arizona, ARIZONA_IRQ_JD_FALL, 0);
+err_fall:
+	arizona_free_irq(arizona, ARIZONA_IRQ_JD_FALL, info);
+err_rise_wake:
+	arizona_set_irq_wake(arizona, ARIZONA_IRQ_JD_RISE, 0);
+err_rise:
+	arizona_free_irq(arizona, ARIZONA_IRQ_JD_RISE, info);
+err_register:
+	pm_runtime_disable(&pdev->dev);
+	extcon_dev_unregister(&info->edev);
+err:
+	return ret;
+}
+
+static int __devexit arizona_extcon_remove(struct platform_device *pdev)
+{
+	struct arizona_extcon_info *info = platform_get_drvdata(pdev);
+	struct arizona *arizona = info->arizona;
+
+	pm_runtime_disable(&pdev->dev);
+
+	arizona_set_irq_wake(arizona, ARIZONA_IRQ_JD_RISE, 0);
+	arizona_set_irq_wake(arizona, ARIZONA_IRQ_JD_FALL, 0);
+	arizona_free_irq(arizona, ARIZONA_IRQ_MICDET, info);
+	arizona_free_irq(arizona, ARIZONA_IRQ_JD_RISE, info);
+	arizona_free_irq(arizona, ARIZONA_IRQ_JD_FALL, info);
+	regmap_update_bits(arizona->regmap, ARIZONA_JACK_DETECT_ANALOGUE,
+			   ARIZONA_JD1_ENA, 0);
+	arizona_clk32k_disable(arizona);
+	extcon_dev_unregister(&info->edev);
+
+	return 0;
+}
+
+static struct platform_driver arizona_extcon_driver = {
+	.driver		= {
+		.name	= "arizona-extcon",
+		.owner	= THIS_MODULE,
+	},
+	.probe		= arizona_extcon_probe,
+	.remove		= __devexit_p(arizona_extcon_remove),
+};
+
+module_platform_driver(arizona_extcon_driver);
+
+MODULE_DESCRIPTION("Arizona Extcon driver");
+MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:extcon-arizona");