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 000000000000..427a289f32a5
--- /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");