Input: Add AB8500 AV Acc. Detection as platform drv

Adds AV Accessory detection driver functionality as a platform driver.

Driver allows detection of basic AV-Accessory connected to 3.5mm
AV-Connector. Supported accessories include headphone, headset, video and
carkit.

Driver controls the audio-in/video-out switch based on the
detected accessory type and notifies about button presses from
basic headsets (No ECI Support).

Accessory status and button presses are reported as standard input
events, if AB8500 ASoC Machine driver is configured.

For accessory properties reporting, ALSA JACK definitions (SND_JACK_*)
are used to report the features supported by the attached accessory.

Button presses are reported with KEY_MEDIA keycode.

Depends on: http://gerrit.lud.stericsson.com/gerrit/16910 for GPIO framework update.

ST-Ericsson ID: ER 275366

Signed-off-by: Rahul Venkatram <rahul.venkatram@stericsson.com>
Change-Id: Ie1c68120fc718710ecac2d3dafe4f3e7b1a53ac1
Signed-off-by: Rahul Venkatram <rahul.venkatram@stericsson.com>
Reviewed-on: http://gerrit.lud.stericsson.com/gerrit/16256
Reviewed-by: Mattias WALLIN <mattias.wallin@stericsson.com>

Conflicts:

	arch/arm/mach-ux500/board-mop500-regulators.c
	arch/arm/mach-ux500/board-mop500.c
	sound/soc/ux500/ux500_ab8500.c

3 files changed, 1336 insertions, 0 deletions

diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index 45dc6aa62ba..0901e01ab07 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -22,6 +22,13 @@ config INPUT_88PM860X_ONKEY
 	  To compile this driver as a module, choose M here: the module
 	  will be called 88pm860x_onkey.
 
+config INPUT_AB8500_ACCDET
+       bool "AB8500 AV Accessory detection"
+       depends on AB8500_CORE && AB8500_GPADC && AB8500_GPIO
+       help
+       Say Y here to enable AV accessory detection features for ST-Ericsson's
+       AB8500 Mix-Sig PMIC.
+
 config INPUT_AB8500_PONKEY
 	tristate "AB8500 Pon (PowerOn) Key"
 	depends on AB8500_CORE
diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
index 38efb2cb182..c77334ac711 100644
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -5,6 +5,7 @@
 # Each configuration option enables a list of files.
 
 obj-$(CONFIG_INPUT_88PM860X_ONKEY)	+= 88pm860x_onkey.o
+obj-$(CONFIG_INPUT_AB8500_ACCDET)       += ab8500-accdet.o
 obj-$(CONFIG_INPUT_AB8500_PONKEY)	+= ab8500-ponkey.o
 obj-$(CONFIG_INPUT_AD714X)		+= ad714x.o
 obj-$(CONFIG_INPUT_AD714X_I2C)		+= ad714x-i2c.o
diff --git a/drivers/input/misc/ab8500-accdet.c b/drivers/input/misc/ab8500-accdet.c
new file mode 100644
index 00000000000..8057d0e881a
--- /dev/null
+++ b/drivers/input/misc/ab8500-accdet.c
@@ -0,0 +1,1328 @@
+/*
+ * Copyright (C) ST-Ericsson SA 2010
+ *
+ * Author: Jarmo K. Kuronen <jarmo.kuronen@symbio.com>
+ *         for ST-Ericsson.
+ *
+ * License terms: GPL V2
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ */
+
+#include <linux/module.h>       /* Needed by all modules */
+#include <linux/kernel.h>       /* Needed for KERN_INFO */
+#include <linux/init.h>         /* Needed for the macros */
+#include <linux/workqueue.h>
+#include <linux/delay.h>
+#include <linux/jiffies.h>
+#include <linux/slab.h>
+#include <linux/input.h>
+#include <sound/soc.h>
+#include <sound/jack.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>
+#include <linux/mfd/ab8500.h>
+#include <linux/mfd/abx500.h>
+#include <linux/mfd/ab8500/gpadc.h>
+#include <linux/mfd/ab8500/gpio.h>
+#include <linux/gpio.h>
+#include <mach/ab8500-accdet.h>
+#ifdef CONFIG_SND_SOC_UX500_AB8500
+#include <sound/ux500_ab8500.h>
+#else
+#define ux500_ab8500_jack_report(i)
+#endif
+
+#define MAX_DET_COUNT			10
+#define MAX_VOLT_DIFF			30
+#define MIN_MIC_POWER			-100
+
+/* Unique value used to identify Headset button input device */
+#define BTN_INPUT_UNIQUE_VALUE	"AB8500HsBtn"
+#define BTN_INPUT_DEV_NAME	"AB8500 Hs Button"
+
+#define DEBOUNCE_PLUG_EVENT_MS		100
+#define DEBOUNCE_PLUG_RETEST_MS		25
+#define DEBOUNCE_UNPLUG_EVENT_MS	0
+
+/*
+ * Register definition for accessory detection.
+ */
+#define AB8500_REGU_CTRL1_SPARE_REG	0x84
+#define AB8500_ACC_DET_DB1_REG		0x80
+#define AB8500_ACC_DET_DB2_REG		0x81
+#define AB8500_ACC_DET_CTRL_REG		0x82
+#define AB8500_IT_SOURCE5_REG		0x04
+
+/* REGISTER: AB8500_ACC_DET_CTRL_REG */
+#define BITS_ACCDETCTRL2_ENA		(0x20 | 0x10 | 0x08)
+#define BITS_ACCDETCTRL1_ENA		(0x02 | 0x01)
+
+/* REGISTER: AB8500_REGU_CTRL1_SPARE_REG */
+#define BIT_REGUCTRL1SPARE_VAMIC1_GROUND	0x01
+
+/* REGISTER: AB8500_IT_SOURCE5_REG */
+#define BIT_ITSOURCE5_ACCDET1		0x04
+
+/* After being loaded, how fast the first check is to be made */
+#define INIT_DELAY_MS			3000
+
+/* Voltage limits (mV) for various types of AV Accessories */
+#define ACCESSORY_DET_VOL_DONTCARE	-1
+#define ACCESSORY_HEADPHONE_DET_VOL_MIN	0
+#define ACCESSORY_HEADPHONE_DET_VOL_MAX	40
+#define ACCESSORY_CVIDEO_DET_VOL_MIN	41
+#define ACCESSORY_CVIDEO_DET_VOL_MAX	105
+#define ACCESSORY_CARKIT_DET_VOL_MIN	1100
+#define ACCESSORY_CARKIT_DET_VOL_MAX	1300
+#define ACCESSORY_HEADSET_DET_VOL_MIN	0
+#define ACCESSORY_HEADSET_DET_VOL_MAX	200
+#define ACCESSORY_OPENCABLE_DET_VOL_MIN	1730
+#define ACCESSORY_OPENCABLE_DET_VOL_MAX	2150
+
+/* Macros */
+
+/*
+ * Conviniency macros to check jack characteristics.
+ */
+#define jack_supports_mic(type) \
+	(type == JACK_TYPE_HEADSET || type == JACK_TYPE_CARKIT)
+#define jack_supports_spkr(type) \
+	((type != JACK_TYPE_DISCONNECTED) && (type != JACK_TYPE_CONNECTED))
+#define jack_supports_buttons(type) \
+	((type == JACK_TYPE_HEADSET) ||\
+	(type == JACK_TYPE_CARKIT) ||\
+	(type == JACK_TYPE_OPENCABLE) ||\
+	(type == JACK_TYPE_CONNECTED))
+
+
+/* Enumerations */
+
+/**
+ * @JACK_TYPE_UNSPECIFIED Not known whether any accessories are connected.
+ * @JACK_TYPE_DISCONNECTED No accessories connected.
+ * @JACK_TYPE_CONNECTED Accessory is connected but functionality was unable to
+ * detect the actual type. In this mode, possible button events are reported.
+ * @JACK_TYPE_HEADPHONE Headphone type of accessory (spkrs only) connected
+ * @JACK_TYPE_HEADSET Headset type of accessory (mic+spkrs) connected
+ * @JACK_TYPE_CARKIT Carkit type of accessory connected
+ * @JACK_TYPE_OPENCABLE Open cable connected
+ * @JACK_TYPE_CVIDEO CVideo type of accessory connected.
+ */
+enum accessory_jack_type {
+       JACK_TYPE_UNSPECIFIED,
+       JACK_TYPE_DISCONNECTED,
+       JACK_TYPE_CONNECTED,
+       JACK_TYPE_HEADPHONE,
+       JACK_TYPE_HEADSET,
+       JACK_TYPE_CARKIT,
+       JACK_TYPE_OPENCABLE,
+       JACK_TYPE_CVIDEO
+};
+
+/**
+ * @BUTTON_UNK Button state not known
+ * @BUTTON_PRESSED Button "down"
+ * @BUTTON_RELEASED Button "up"
+ */
+enum accessory_button_state {
+	BUTTON_UNK,
+	BUTTON_PRESSED,
+	BUTTON_RELEASED
+};
+
+/**
+ * @PLUG_IRQ Interrupt gen. when accessory plugged in
+ * @UNPLUG_IRQ Interrupt gen. when accessory plugged out
+ * @BUTTON_PRESS_IRQ Interrupt gen. when accessory button pressed.
+ * @BUTTON_RELEASE_IRQ Interrupt gen. when accessory button released.
+ */
+enum accessory_irq {
+	PLUG_IRQ,
+	UNPLUG_IRQ,
+	BUTTON_PRESS_IRQ,
+	BUTTON_RELEASE_IRQ
+};
+
+/**
+ * Enumerates the op. modes of the avcontrol switch
+ * @AUDIO_IN Audio input is selected
+ * @VIDEO_OUT Video output is selected
+ */
+enum accessory_avcontrol_dir {
+	AUDIO_IN,
+	VIDEO_OUT,
+};
+
+/**
+ * @REGULATOR_VAUDIO v-audio regulator
+ * @REGULATOR_VAMIC1 v-amic1 regulator
+ * @REGULATOR_AVSWITCH Audio/Video select switch regulator
+ * @REGULATOR_ALL All regulators combined
+ */
+enum accessory_regulator {
+	REGULATOR_NONE = 0x0,
+	REGULATOR_VAUDIO = 0x1,
+	REGULATOR_VAMIC1 = 0x2,
+	REGULATOR_AVSWITCH = 0x4,
+	REGULATOR_ALL = 0xFF
+};
+
+/* Structures */
+
+/**
+ * Describes an interrupt
+ * @irq interrupt identifier
+ * @name name of the irq in platform data
+ * @isr interrupt service routine
+ * @register are we currently registered to receive interrupts from this source.
+ */
+struct accessory_irq_descriptor {
+	enum accessory_irq irq;
+	const char *name;
+	irq_handler_t isr;
+	int registered;
+};
+
+/**
+ * Encapsulates info of single regulator.
+ * @id regulator identifier
+ * @name name of the regulator
+ * @enabled flag indicating whether regu is currently enabled.
+ * @handle regulator handle
+ */
+struct accessory_regu_descriptor {
+	enum accessory_regulator id;
+	const char *name;
+	int enabled;
+	struct regulator *handle;
+};
+
+/**
+ * Defines attributes for accessory detection operation.
+ * @typename type as string
+ * @type Type of accessory this task tests
+ * @req_det_count How many times this particular type of accessory
+ * needs to be detected in sequence in order to accept. Multidetection
+ * implemented to avoid false detections during plug-in.
+ * @meas_mv Should ACCDETECT2 input voltage be measured just before
+ * making the decision or can cached voltage be used instead.
+ * @minvol minimum voltage (mV) for decision
+ * @maxvol maximum voltage (mV) for decision
+ */
+struct accessory_detect_task {
+	const char *typename;
+	enum accessory_jack_type type;
+	int req_det_count;
+	int meas_mv;
+	int minvol;
+	int maxvol;
+};
+
+/**
+ * Device data, capsulates all relevant device data structures.
+ *
+ * @pdev pointer to platform device
+ * @pdata Platform data
+ * @gpadc interface for ADC data
+ * @irq_work_queue Work queue for deferred interrupt processing
+ *
+ * @detect_work work item to perform detection work
+ * @unplug_irq_work work item to process unplug event
+ * @init_work work item to process initialization work.
+ *
+ * @btn_input_dev button input device used to report btn presses
+ * @btn_state Current state of accessory button
+ *
+ * @jack_type type of currently connected accessory
+ * @reported_jack_type previously reported jack type.
+ * @jack_type_temp temporary storage for currently connected accessory
+ *
+ * @jack_det_count counter how many times in sequence the accessory
+ * type detection has produced same result.
+ * @total_jack_det_count after plug-in irq, how many times detection
+ * has totally been made in order to detect the accessory type
+ *
+ * @detect_jiffies Used to save timestamp when detection was made. Timestamp
+ * used to filter out spurious button presses that might occur during the
+ * plug-in procedure.
+ *
+ * @accdet1_th_set flag to indicate whether accdet1 threshold and debounce
+ * times are configured
+ * @accdet2_th_set flag to indicate whether accdet2 thresholds are configured
+ * @gpio35_dir_set flag to indicate whether GPIO35 (VIDEOCTRL) direction
+ * has been configured.
+ */
+struct ab8500_ad {
+	struct platform_device *pdev;
+	struct ab8500_accdet_platform_data *pdata;
+	struct ab8500_gpadc *gpadc;
+	struct workqueue_struct *irq_work_queue;
+
+	struct delayed_work detect_work;
+	struct delayed_work unplug_irq_work;
+	struct delayed_work init_work;
+
+	struct input_dev *btn_input_dev;
+	enum accessory_button_state btn_state;
+
+	enum accessory_jack_type jack_type;
+	enum accessory_jack_type reported_jack_type;
+	enum accessory_jack_type jack_type_temp;
+
+	int jack_det_count;
+	int total_jack_det_count;
+
+	unsigned long detect_jiffies;
+
+	int accdet1_th_set;
+	int accdet2_th_set;
+	int gpio35_dir_set;
+};
+
+/* Forward declarations */
+
+static void config_accdetect(struct ab8500_ad *dd);
+
+static void release_irq(struct ab8500_ad *dd, enum accessory_irq irq_id);
+static void claim_irq(struct ab8500_ad *dd, enum accessory_irq irq_id);
+
+static irqreturn_t unplug_irq_handler(int irq, void *_userdata);
+static irqreturn_t plug_irq_handler(int irq, void *_userdata);
+static irqreturn_t button_press_irq_handler(int irq, void *_userdata);
+static irqreturn_t button_release_irq_handler(int irq, void *_userdata);
+
+static void unplug_irq_handler_work(struct work_struct *work);
+static void detect_work(struct work_struct *work);
+static void init_work(struct work_struct *work);
+
+static enum accessory_jack_type detect(struct ab8500_ad *dd, int *required_det);
+static void set_av_switch(struct ab8500_ad *dd,
+		enum accessory_avcontrol_dir dir);
+
+/* Static data initialization */
+
+static struct accessory_detect_task detect_ops[] = {
+	{
+		.type = JACK_TYPE_DISCONNECTED,
+		.typename = "DISCONNECTED",
+		.meas_mv = 1,
+		.req_det_count = 1,
+		.minvol = ACCESSORY_DET_VOL_DONTCARE,
+		.maxvol = ACCESSORY_DET_VOL_DONTCARE
+	},
+	{
+		.type = JACK_TYPE_HEADPHONE,
+		.typename = "HEADPHONE",
+		.meas_mv = 1,
+		.req_det_count = 1,
+		.minvol = ACCESSORY_HEADPHONE_DET_VOL_MIN,
+		.maxvol = ACCESSORY_HEADPHONE_DET_VOL_MAX
+	},
+	{
+		.type = JACK_TYPE_CVIDEO,
+		.typename = "CVIDEO",
+		.meas_mv = 0,
+		.req_det_count = 4,
+		.minvol = ACCESSORY_CVIDEO_DET_VOL_MIN,
+		.maxvol = ACCESSORY_CVIDEO_DET_VOL_MAX
+	},
+	{
+		.type = JACK_TYPE_OPENCABLE,
+		.typename = "OPENCABLE",
+		.meas_mv = 0,
+		.req_det_count = 4,
+		.minvol = ACCESSORY_OPENCABLE_DET_VOL_MIN,
+		.maxvol = ACCESSORY_OPENCABLE_DET_VOL_MAX
+	},
+	{
+		.type = JACK_TYPE_CARKIT,
+		.typename = "CARKIT",
+		.meas_mv = 1,
+		.req_det_count = 1,
+		.minvol = ACCESSORY_CARKIT_DET_VOL_MIN,
+		.maxvol = ACCESSORY_CARKIT_DET_VOL_MAX
+	},
+	{
+		.type = JACK_TYPE_HEADSET,
+		.typename = "HEADSET",
+		.meas_mv = 0,
+		.req_det_count = 2,
+		.minvol = ACCESSORY_HEADSET_DET_VOL_MIN,
+		.maxvol = ACCESSORY_HEADSET_DET_VOL_MAX
+	},
+	{
+		.type = JACK_TYPE_CONNECTED,
+		.typename = "CONNECTED",
+		.meas_mv = 0,
+		.req_det_count = 4,
+		.minvol = ACCESSORY_DET_VOL_DONTCARE,
+		.maxvol = ACCESSORY_DET_VOL_DONTCARE
+	}
+};
+
+static struct accessory_regu_descriptor regu_desc[3] = {
+	{
+		.id = REGULATOR_VAUDIO,
+		.name = "v-audio",
+	},
+	{
+		.id = REGULATOR_VAMIC1,
+		.name = "v-amic1",
+	},
+	{
+		.id = REGULATOR_AVSWITCH,
+		.name = "vcc-avswitch",
+	},
+};
+
+static struct accessory_irq_descriptor irq_desc[] = {
+	{
+		.irq = PLUG_IRQ,
+		.name = "ACC_DETECT_1DB_F",
+		.isr = plug_irq_handler,
+	},
+	{
+		.irq = UNPLUG_IRQ,
+		.name = "ACC_DETECT_1DB_R",
+		.isr = unplug_irq_handler,
+	},
+	{
+		.irq = BUTTON_PRESS_IRQ,
+		.name = "ACC_DETECT_22DB_F",
+		.isr = button_press_irq_handler,
+	},
+	{
+		.irq = BUTTON_RELEASE_IRQ,
+		.name = "ACC_DETECT_22DB_R",
+		.isr = button_release_irq_handler,
+	},
+};
+
+/*
+ * textual represenation of the accessory type
+ */
+static const char *accessory_str(enum accessory_jack_type type)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(detect_ops); i++)
+		if (type == detect_ops[i].type)
+			return detect_ops[i].typename;
+
+	return "UNKNOWN?";
+}
+
+/*
+ * enables regulator but only if it has not been enabled earlier.
+ */
+static void accessory_regulator_enable(enum accessory_regulator reg)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(regu_desc); i++) {
+		if (reg & regu_desc[i].id) {
+			if (!regu_desc[i].enabled) {
+				if (!regulator_enable(regu_desc[i].handle))
+					regu_desc[i].enabled = 1;
+			}
+		}
+	}
+}
+
+/*
+ * disables regulator but only if it has been previously enabled.
+ */
+static void accessory_regulator_disable(enum accessory_regulator reg)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(regu_desc); i++) {
+		if (reg & regu_desc[i].id) {
+			if (regu_desc[i].enabled) {
+				if (!regulator_disable(regu_desc[i].handle))
+					regu_desc[i].enabled = 0;
+			}
+		}
+	}
+}
+
+/*
+ * frees previously retrieved regulators.
+ */
+static void free_regulators(void)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(regu_desc); i++) {
+		if (regu_desc[i].handle) {
+			regulator_put(regu_desc[i].handle);
+			regu_desc[i].handle = NULL;
+		}
+	}
+}
+
+/*
+ * gets required regulators.
+ */
+static int create_regulators(struct ab8500_ad *dd)
+{
+	int i;
+	int status = 0;
+
+	for (i = 0; i < ARRAY_SIZE(regu_desc); i++) {
+		struct regulator *regu =
+			regulator_get(&dd->pdev->dev, regu_desc[i].name);
+		if (IS_ERR(regu)) {
+			status = PTR_ERR(regu);
+			dev_err(&dd->pdev->dev,
+				"%s: Failed to get supply '%s' (%d).\n",
+				__func__, regu_desc[i].name, status);
+			free_regulators();
+			goto out;
+		} else {
+			regu_desc[i].handle = regu;
+		}
+	}
+
+out:
+	return status;
+}
+
+/*
+ * configures accdet2 input on/off
+ */
+static void config_accdetect2_hw(struct ab8500_ad *dd, int enable)
+{
+	int ret = 0;
+
+	if (!dd->accdet2_th_set) {
+		/* Configure accdetect21+22 thresholds */
+		ret = abx500_set_register_interruptible(&dd->pdev->dev,
+				AB8500_ECI_AV_ACC,
+				AB8500_ACC_DET_DB2_REG,
+				dd->pdata->accdet2122_th);
+		if (ret < 0) {
+			dev_err(&dd->pdev->dev,
+				"%s: Failed to write reg (%d).\n", __func__,
+					ret);
+			goto out;
+		} else {
+			dd->accdet2_th_set = 1;
+		}
+	}
+
+	/* Enable/Disable accdetect21 comparators + pullup */
+	ret = abx500_mask_and_set_register_interruptible(
+			&dd->pdev->dev,
+			AB8500_ECI_AV_ACC,
+			AB8500_ACC_DET_CTRL_REG,
+			BITS_ACCDETCTRL2_ENA,
+			enable ? BITS_ACCDETCTRL2_ENA : 0);
+
+	if (ret < 0)
+		dev_err(&dd->pdev->dev, "%s: Failed to update reg (%d).\n",
+				__func__, ret);
+
+out:
+	return;
+}
+
+/*
+ * configures accdet1 input on/off
+ */
+void config_accdetect1_hw(struct ab8500_ad *dd, int enable)
+{
+	int ret;
+
+	if (!dd->accdet1_th_set) {
+		ret = abx500_set_register_interruptible(&dd->pdev->dev,
+				AB8500_ECI_AV_ACC,
+				AB8500_ACC_DET_DB1_REG,
+				dd->pdata->accdet1_dbth);
+		if (ret < 0)
+			dev_err(&dd->pdev->dev,
+				"%s: Failed to write reg (%d).\n", __func__,
+				ret);
+		else
+			dd->accdet1_th_set = 1;
+	}
+
+	/* enable accdetect1 comparator */
+	ret = abx500_mask_and_set_register_interruptible(
+				&dd->pdev->dev,
+				AB8500_ECI_AV_ACC,
+				AB8500_ACC_DET_CTRL_REG,
+				BITS_ACCDETCTRL1_ENA,
+				enable ? BITS_ACCDETCTRL1_ENA : 0);
+
+	if (ret < 0)
+		dev_err(&dd->pdev->dev,
+			"%s: Failed to update reg (%d).\n", __func__, ret);
+}
+
+/*
+ * create input device for button press reporting
+ */
+static int create_btn_input_dev(struct ab8500_ad *dd)
+{
+	int err;
+
+	dd->btn_input_dev = input_allocate_device();
+	if (!dd->btn_input_dev) {
+		dev_err(&dd->pdev->dev, "%s: Failed to allocate input dev.\n",
+			__func__);
+		err = -ENOMEM;
+		goto out;
+	}
+
+	input_set_capability(dd->btn_input_dev,
+				EV_KEY,
+				dd->pdata->btn_keycode);
+
+	dd->btn_input_dev->name = BTN_INPUT_DEV_NAME;
+	dd->btn_input_dev->uniq = BTN_INPUT_UNIQUE_VALUE;
+	dd->btn_input_dev->dev.parent = &dd->pdev->dev;
+
+	err = input_register_device(dd->btn_input_dev);
+	if (err) {
+		dev_err(&dd->pdev->dev,
+			"%s: register_input_device failed (%d).\n", __func__,
+			err);
+		input_free_device(dd->btn_input_dev);
+		dd->btn_input_dev = NULL;
+		goto out;
+	}
+out:
+	return err;
+}
+
+/*
+ * reports jack status
+ */
+void report_jack_status(struct ab8500_ad *dd)
+{
+	int value = 0;
+
+	/* Never report possible open cable */
+	if (dd->jack_type == JACK_TYPE_OPENCABLE)
+		goto out;
+
+	/* Never report same state twice in a row */
+	if (dd->jack_type == dd->reported_jack_type)
+		goto out;
+	dd->reported_jack_type = dd->jack_type;
+
+	dev_info(&dd->pdev->dev, "Accessory: %s\n",
+		accessory_str(dd->jack_type));
+
+	if (dd->jack_type != JACK_TYPE_DISCONNECTED &&
+		dd->jack_type != JACK_TYPE_UNSPECIFIED)
+		value |= SND_JACK_MECHANICAL;
+	if (jack_supports_mic(dd->jack_type))
+		value |= SND_JACK_MICROPHONE;
+	if (jack_supports_spkr(dd->jack_type))
+		value |= (SND_JACK_HEADPHONE | SND_JACK_LINEOUT);
+	if (dd->jack_type == JACK_TYPE_CVIDEO) {
+		value |= SND_JACK_VIDEOOUT;
+		set_av_switch(dd, VIDEO_OUT);
+	}
+
+	ux500_ab8500_jack_report(value);
+
+out: return;
+}
+
+/*
+ * returns the high level status whether some accessory is connected (1|0).
+ */
+static int detect_plugged_in(struct ab8500_ad *dd)
+{
+	u8 value = 0;
+	int status = abx500_get_register_interruptible(
+				&dd->pdev->dev,
+				AB8500_INTERRUPT,
+				AB8500_IT_SOURCE5_REG,
+				&value);
+	if (status < 0) {
+		dev_err(&dd->pdev->dev, "%s: reg read failed (%d).\n",
+			__func__, status);
+		return 0;
+	}
+
+	return value & BIT_ITSOURCE5_ACCDET1 ? 0 : 1;
+}
+
+/*
+ * mic_line_voltage_stable - measures a relative stable voltage from spec. input
+ */
+static int meas_voltage_stable(struct ab8500_ad *dd, u8 input)
+{
+	int iterations = 2;
+	int v1, v2, dv;
+
+	v1 = ab8500_gpadc_convert(dd->gpadc, input);
+	do {
+		msleep(1);
+		--iterations;
+		v2 = ab8500_gpadc_convert(dd->gpadc, input);
+		dv = abs(v2 - v1);
+		v1 = v2;
+	} while (iterations > 0 && dv > MAX_VOLT_DIFF);
+
+	return v1;
+}
+
+/*
+ * worker routine to handle accessory unplug case
+ */
+static void unplug_irq_handler_work(struct work_struct *work)
+{
+	struct ab8500_ad *dd = container_of(work,
+		struct ab8500_ad, unplug_irq_work.work);
+
+	dev_dbg(&dd->pdev->dev, "%s: Enter\n", __func__);
+
+	dd->jack_type = dd->jack_type_temp = JACK_TYPE_DISCONNECTED;
+	dd->jack_det_count = dd->total_jack_det_count = 0;
+	dd->btn_state = BUTTON_UNK;
+	config_accdetect(dd);
+
+	set_av_switch(dd, AUDIO_IN);
+
+	accessory_regulator_disable(REGULATOR_ALL);
+
+	report_jack_status(dd);
+}
+
+/*
+ * interrupt service routine for accessory unplug.
+ */
+static irqreturn_t unplug_irq_handler(int irq, void *_userdata)
+{
+	struct ab8500_ad *dd = _userdata;
+
+	dev_dbg(&dd->pdev->dev, "%s: Enter (irq=%d)\n", __func__, irq);
+
+	queue_delayed_work(dd->irq_work_queue, &dd->unplug_irq_work,
+			msecs_to_jiffies(DEBOUNCE_UNPLUG_EVENT_MS));
+
+	return IRQ_HANDLED;
+}
+
+/*
+ * interrupt service routine for accessory plug.
+ */
+static irqreturn_t plug_irq_handler(int irq, void *_userdata)
+{
+	struct ab8500_ad *dd = _userdata;
+
+	dev_dbg(&dd->pdev->dev, "%s: Enter (irq=%d)\n",
+		__func__, irq);
+
+	switch (dd->jack_type) {
+	case JACK_TYPE_DISCONNECTED:
+	case JACK_TYPE_UNSPECIFIED:
+		queue_delayed_work(dd->irq_work_queue, &dd->detect_work,
+			msecs_to_jiffies(DEBOUNCE_PLUG_EVENT_MS));
+		break;
+
+	default:
+		dev_err(&dd->pdev->dev, "%s: Unexpected plug IRQ\n", __func__);
+		break;
+	}
+
+	return IRQ_HANDLED;
+}
+
+/*
+ * worker routine to perform detection.
+ */
+static void detect_work(struct work_struct *work)
+{
+	int req_det_count = 1;
+	enum accessory_jack_type new_type;
+	struct ab8500_ad *dd = container_of(work,
+		struct ab8500_ad, detect_work.work);
+
+	dev_dbg(&dd->pdev->dev, "%s: Enter\n", __func__);
+
+	new_type = detect(dd, &req_det_count);
+
+	dd->total_jack_det_count++;
+	if (dd->jack_type_temp == new_type) {
+		dd->jack_det_count++;
+	} else {
+		dd->jack_det_count = 1;
+		dd->jack_type_temp = new_type;
+	}
+
+	if (dd->total_jack_det_count >= MAX_DET_COUNT) {
+		dev_err(&dd->pdev->dev,
+			"%s: MAX_DET_COUNT(=%d) reached. Bailing out.\n",
+					__func__, MAX_DET_COUNT);
+		queue_delayed_work(dd->irq_work_queue, &dd->unplug_irq_work,
+				msecs_to_jiffies(DEBOUNCE_UNPLUG_EVENT_MS));
+	} else if (dd->jack_det_count >= req_det_count) {
+		dd->total_jack_det_count = dd->jack_det_count = 0;
+		dd->jack_type = new_type;
+		dd->detect_jiffies = jiffies;
+		report_jack_status(dd);
+		config_accdetect(dd);
+	} else {
+		queue_delayed_work(dd->irq_work_queue,
+				&dd->detect_work,
+				msecs_to_jiffies(DEBOUNCE_PLUG_RETEST_MS));
+	}
+}
+
+/*
+ * reports a button event (pressed, released).
+ */
+static void report_btn_event(struct ab8500_ad *dd, int down)
+{
+	input_report_key(dd->btn_input_dev, dd->pdata->btn_keycode, down);
+	input_sync(dd->btn_input_dev);
+
+	dev_dbg(&dd->pdev->dev, "HS-BTN: %s\n", down ? "PRESSED" : "RELEASED");
+}
+
+/*
+ * interrupt service routine invoked when hs button is pressed down.
+ */
+static irqreturn_t button_press_irq_handler(int irq, void *_userdata)
+{
+	struct ab8500_ad *dd = _userdata;
+
+	unsigned long accept_jiffies = dd->detect_jiffies +
+			msecs_to_jiffies(1000);
+	if (time_before(jiffies, accept_jiffies)) {
+		dev_dbg(&dd->pdev->dev, "%s: Skipped spurious btn press.\n",
+			__func__);
+		return IRQ_HANDLED;
+	}
+
+	dev_dbg(&dd->pdev->dev, "%s: Enter (irq=%d)\n", __func__, irq);
+
+	if (dd->jack_type == JACK_TYPE_OPENCABLE) {
+		/* Someting got connected to open cable -> detect.. */
+		config_accdetect2_hw(dd, 0);
+		queue_delayed_work(dd->irq_work_queue, &dd->detect_work,
+			msecs_to_jiffies(DEBOUNCE_PLUG_EVENT_MS));
+		return IRQ_HANDLED;
+	}
+
+	if (dd->btn_state == BUTTON_PRESSED)
+		return IRQ_HANDLED;
+
+	if (jack_supports_buttons(dd->jack_type)) {
+		dd->btn_state = BUTTON_PRESSED;
+		report_btn_event(dd, 1);
+	} else {
+		dd->btn_state = BUTTON_UNK;
+	}
+
+	return IRQ_HANDLED;
+}
+
+/*
+ * interrupts service routine invoked when hs button is released.
+ */
+static irqreturn_t button_release_irq_handler(int irq, void *_userdata)
+{
+	struct ab8500_ad *dd = _userdata;
+
+	dev_dbg(&dd->pdev->dev, "%s: Enter (irq=%d)\n", __func__, irq);
+
+	if (dd->jack_type == JACK_TYPE_OPENCABLE)
+		return IRQ_HANDLED;
+
+	if (dd->btn_state != BUTTON_PRESSED)
+		return IRQ_HANDLED;
+
+	if (jack_supports_buttons(dd->jack_type)) {
+		report_btn_event(dd, 0);
+		dd->btn_state = BUTTON_RELEASED;
+	} else {
+		dd->btn_state = BUTTON_UNK;
+	}
+
+	return IRQ_HANDLED;
+}
+
+/*
+ * configures HW so that it is possible to make decision whether
+ * accessory is connected or not.
+ */
+static void config_hw_test_plug_connected(struct ab8500_ad *dd, int enable)
+{
+	int ret;
+
+	dev_dbg(&dd->pdev->dev, "%s:%d\n", __func__, enable);
+
+	ret = ab8500_config_pull_up_or_down(dd->pdev,
+					dd->pdata->video_ctrl_gpio, !enable);
+	if (ret < 0) {
+		dev_err(&dd->pdev->dev,
+			"%s: Failed to update reg (%d).\n", __func__, ret);
+		return;
+	}
+
+	if (enable)
+		accessory_regulator_enable(REGULATOR_VAMIC1);
+}
+
+/*
+ * configures HW so that carkit/headset detection can be accomplished.
+ */
+static void config_hw_test_basic_carkit(struct ab8500_ad *dd, int enable)
+{
+	int ret;
+
+	dev_dbg(&dd->pdev->dev, "%s:%d\n", __func__, enable);
+
+	if (enable)
+		accessory_regulator_disable(REGULATOR_VAMIC1);
+
+	/* Un-Ground the VAMic1 output when enabled */
+	ret = abx500_mask_and_set_register_interruptible(
+				&dd->pdev->dev,
+				AB8500_REGU_CTRL1,
+				AB8500_REGU_CTRL1_SPARE_REG,
+				BIT_REGUCTRL1SPARE_VAMIC1_GROUND,
+				enable ? BIT_REGUCTRL1SPARE_VAMIC1_GROUND : 0);
+	if (ret < 0)
+		dev_err(&dd->pdev->dev,
+			"%s: Failed to update reg (%d).\n", __func__, ret);
+}
+
+/*
+ * checks whether measured voltage is in given range. depending on arguments,
+ * voltage might be re-measured or previously measured voltage is reused.
+ */
+static int mic_vol_in_range(struct ab8500_ad *dd,
+			int lo, int hi, int force_read)
+{
+	static int mv = MIN_MIC_POWER;
+
+	if (mv == -100 || force_read)
+		mv = meas_voltage_stable(dd, ACC_DETECT2);
+
+	return (mv >= lo && mv <= hi) ? 1 : 0;
+}
+
+/*
+ * checks whether the currently connected HW is of given type.
+ */
+static int detect_hw(struct ab8500_ad *dd,
+			struct accessory_detect_task *task)
+{
+	int status;
+
+	switch (task->type) {
+	case JACK_TYPE_DISCONNECTED:
+		config_hw_test_plug_connected(dd, 1);
+		status = !detect_plugged_in(dd);
+		break;
+	case JACK_TYPE_CONNECTED:
+		config_hw_test_plug_connected(dd, 1);
+		status = detect_plugged_in(dd);
+		break;
+	case JACK_TYPE_CARKIT:
+		config_hw_test_basic_carkit(dd, 1);
+		/* flow through.. */
+	case JACK_TYPE_HEADPHONE:
+	case JACK_TYPE_CVIDEO:
+	case JACK_TYPE_HEADSET:
+	case JACK_TYPE_OPENCABLE:
+		status = mic_vol_in_range(dd,
+					task->minvol,
+					task->maxvol,
+					task->meas_mv);
+		break;
+	default:
+		status = 0;
+	}
+
+	return status;
+}
+
+/*
+ * sets the av switch direction - audio-in vs video-out
+ */
+static void set_av_switch(struct ab8500_ad *dd,
+		enum accessory_avcontrol_dir dir)
+{
+	int ret;
+
+	dev_dbg(&dd->pdev->dev, "%s: Enter\n", __func__);
+	if (!dd->gpio35_dir_set) {
+		ret = gpio_direction_output(dd->pdata->video_ctrl_gpio,
+						dir == AUDIO_IN ? 1 : 0);
+		if (ret < 0) {
+			dev_err(&dd->pdev->dev,
+				"%s: Output video ctrl signal failed (%d).\n",
+								__func__, ret);
+		} else {
+			dd->gpio35_dir_set = 1;
+			dev_dbg(&dd->pdev->dev, "AV-SWITCH: %s\n",
+				dir == AUDIO_IN ? "AUDIO_IN" : "VIDEO_OUT");
+		}
+	} else {
+		gpio_set_value(dd->pdata->video_ctrl_gpio,
+						dir == AUDIO_IN ? 1 : 0);
+	}
+}
+
+/*
+ * Tries to detect the currently attached accessory
+ */
+static enum accessory_jack_type detect(struct ab8500_ad *dd,
+			int *req_det_count)
+{
+	enum accessory_jack_type type = JACK_TYPE_DISCONNECTED;
+	int i;
+
+	accessory_regulator_enable(REGULATOR_VAUDIO | REGULATOR_AVSWITCH);
+
+	for (i = 0; i < ARRAY_SIZE(detect_ops); ++i) {
+		if (detect_hw(dd, &detect_ops[i])) {
+			type = detect_ops[i].type;
+			*req_det_count = detect_ops[i].req_det_count;
+			break;
+		}
+	}
+
+	config_hw_test_basic_carkit(dd, 0);
+	config_hw_test_plug_connected(dd, 0);
+
+	if (jack_supports_buttons(type))
+		accessory_regulator_enable(REGULATOR_VAMIC1);
+	else
+		accessory_regulator_disable(REGULATOR_VAMIC1 |
+						REGULATOR_AVSWITCH);
+
+	accessory_regulator_disable(REGULATOR_VAUDIO);
+
+	return type;
+}
+
+/*
+ * registers to specific interrupt
+ */
+static void claim_irq(struct ab8500_ad *dd, enum accessory_irq irq_id)
+{
+	int ret;
+	int irq;
+
+	if (irq_desc[irq_id].registered)
+		return;
+
+	irq = platform_get_irq_byname(
+			dd->pdev,
+			irq_desc[irq_id].name);
+	if (irq < 0) {
+		dev_err(&dd->pdev->dev,
+			"%s: Failed to get irq %s\n", __func__,
+			irq_desc[irq_id].name);
+		return;
+	}
+
+	ret = request_threaded_irq(irq,
+				NULL,
+				irq_desc[irq_id].isr,
+				IRQF_NO_SUSPEND | IRQF_SHARED,
+				irq_desc[irq_id].name,
+				dd);
+	if (ret != 0) {
+		dev_err(&dd->pdev->dev,
+			"%s: Failed to claim irq %s (%d)\n",
+			__func__,
+			irq_desc[irq_id].name,
+			ret);
+	} else {
+		irq_desc[irq_id].registered = 1;
+		dev_dbg(&dd->pdev->dev, "%s: %s\n",
+			__func__, irq_desc[irq_id].name);
+	}
+}
+
+/*
+ * releases specific interrupt
+ */
+static void release_irq(struct ab8500_ad *dd, enum accessory_irq irq_id)
+{
+	int irq;
+
+	if (!irq_desc[irq_id].registered)
+		return;
+
+	irq = platform_get_irq_byname(
+			dd->pdev,
+			irq_desc[irq_id].name);
+	if (irq < 0) {
+		dev_err(&dd->pdev->dev,
+			"%s: Failed to get irq %s (%d)\n",
+			__func__,
+			irq_desc[irq_id].name, irq);
+	} else {
+		free_irq(irq, dd);
+		irq_desc[irq_id].registered = 0;
+		dev_dbg(&dd->pdev->dev, "%s: %s\n",
+			__func__, irq_desc[irq_id].name);
+	}
+}
+
+/*
+ * configures interrupts + detection hardware to meet the requirements
+ * set by currently attached accessory type.
+ */
+static void config_accdetect(struct ab8500_ad *dd)
+{
+	switch (dd->jack_type) {
+	case JACK_TYPE_UNSPECIFIED:
+		config_accdetect1_hw(dd, 1);
+		config_accdetect2_hw(dd, 0);
+
+		release_irq(dd, PLUG_IRQ);
+		release_irq(dd, UNPLUG_IRQ);
+		release_irq(dd, BUTTON_PRESS_IRQ);
+		release_irq(dd, BUTTON_RELEASE_IRQ);
+		break;
+
+	case JACK_TYPE_DISCONNECTED:
+	case JACK_TYPE_HEADPHONE:
+	case JACK_TYPE_CVIDEO:
+		config_accdetect1_hw(dd, 1);
+		config_accdetect2_hw(dd, 0);
+
+		claim_irq(dd, PLUG_IRQ);
+		claim_irq(dd, UNPLUG_IRQ);
+		release_irq(dd, BUTTON_PRESS_IRQ);
+		release_irq(dd, BUTTON_RELEASE_IRQ);
+		break;
+
+	case JACK_TYPE_CONNECTED:
+	case JACK_TYPE_HEADSET:
+	case JACK_TYPE_CARKIT:
+	case JACK_TYPE_OPENCABLE:
+		config_accdetect1_hw(dd, 1);
+		config_accdetect2_hw(dd, 1);
+
+		release_irq(dd, PLUG_IRQ);
+		claim_irq(dd, UNPLUG_IRQ);
+		claim_irq(dd, BUTTON_PRESS_IRQ);
+		claim_irq(dd, BUTTON_RELEASE_IRQ);
+		break;
+
+	default:
+		dev_err(&dd->pdev->dev, "%s: Unknown type: %d\n",
+			__func__, dd->jack_type);
+	}
+}
+
+/*
+ * Deferred initialization of the work.
+ */
+static void init_work(struct work_struct *work)
+{
+	struct ab8500_ad *dd = container_of(work,
+		struct ab8500_ad, init_work.work);
+
+	dev_dbg(&dd->pdev->dev, "%s: Enter\n", __func__);
+
+	set_av_switch(dd, AUDIO_IN);
+	dd->jack_type = dd->reported_jack_type = JACK_TYPE_UNSPECIFIED;
+	config_accdetect(dd);
+	queue_delayed_work(dd->irq_work_queue,
+				&dd->detect_work,
+				msecs_to_jiffies(0));
+}
+
+/*
+ * performs platform device initialization
+ */
+int ab8500_accessory_init(struct platform_device *pdev)
+{
+	struct ab8500_ad *dd;
+	struct ab8500_platform_data *plat;
+
+	dev_dbg(&pdev->dev, "Enter: %s\n", __func__);
+
+	dd = kzalloc(sizeof(struct ab8500_ad), GFP_KERNEL);
+	if (!dd) {
+		dev_err(&pdev->dev, "%s: Mem. alloc failed\n", __func__);
+		goto fail_no_mem_for_devdata;
+	}
+
+	dd->pdev = pdev;
+	dd->pdata = pdev->dev.platform_data;
+	plat = dev_get_platdata(pdev->dev.parent);
+
+	if (!plat || !plat->accdet) {
+		dev_err(&pdev->dev, "%s: Failed to get accdet plat data.\n",
+			__func__);
+		goto fail_no_ab8500_dev;
+	}
+	dd->pdata = plat->accdet;
+
+	if (dd->pdata->video_ctrl_gpio) {
+		if (!gpio_is_valid(dd->pdata->video_ctrl_gpio)) {
+			dev_err(&pdev->dev,
+				"%s: Video ctrl GPIO invalid (%d).\n", __func__,
+						dd->pdata->video_ctrl_gpio);
+			goto fail_video_ctrl_gpio;
+		}
+		if (gpio_request(dd->pdata->video_ctrl_gpio, "Video Control")) {
+			dev_err(&pdev->dev, "%s: Get video ctrl GPIO failed.\n",
+								__func__);
+			goto fail_video_ctrl_gpio;
+		}
+	}
+
+	if (create_btn_input_dev(dd) < 0) {
+		dev_err(&pdev->dev, "%s: create_button_input_dev failed.\n",
+			__func__);
+		goto fail_no_btn_input_dev;
+	}
+
+	if (create_regulators(dd) < 0) {
+		dev_err(&pdev->dev, "%s: failed to create regulators\n",
+			__func__);
+		goto fail_no_regulators;
+	}
+	dd->btn_state = BUTTON_UNK;
+
+	dd->irq_work_queue = create_singlethread_workqueue("ab8500_accdet_wq");
+	if (!dd->irq_work_queue) {
+		dev_err(&pdev->dev, "%s: Failed to create wq\n", __func__);
+		goto fail_no_mem_for_wq;
+	}
+	dd->gpadc = ab8500_gpadc_get();
+
+	INIT_DELAYED_WORK(&dd->detect_work, detect_work);
+	INIT_DELAYED_WORK(&dd->unplug_irq_work, unplug_irq_handler_work);
+	INIT_DELAYED_WORK(&dd->init_work, init_work);
+
+	/* Deferred init/detect since no use for the info early in boot */
+	queue_delayed_work(dd->irq_work_queue,
+				&dd->init_work,
+				msecs_to_jiffies(INIT_DELAY_MS));
+
+	platform_set_drvdata(pdev, dd);
+
+	return 0;
+
+fail_no_mem_for_wq:
+	free_regulators();
+fail_no_regulators:
+	input_unregister_device(dd->btn_input_dev);
+fail_no_btn_input_dev:
+	gpio_free(dd->pdata->video_ctrl_gpio);
+fail_video_ctrl_gpio:
+fail_no_ab8500_dev:
+	kfree(dd);
+fail_no_mem_for_devdata:
+
+	return -ENOMEM;
+}
+
+/*
+ * Performs platform device cleanup
+ */
+void ab8500_accessory_cleanup(struct ab8500_ad *dd)
+{
+	dev_dbg(&dd->pdev->dev, "Enter: %s\n", __func__);
+
+	dd->jack_type = JACK_TYPE_UNSPECIFIED;
+	config_accdetect(dd);
+
+	gpio_free(dd->pdata->video_ctrl_gpio);
+	input_unregister_device(dd->btn_input_dev);
+	free_regulators();
+
+	cancel_delayed_work(&dd->detect_work);
+	cancel_delayed_work(&dd->unplug_irq_work);
+	cancel_delayed_work(&dd->init_work);
+	flush_workqueue(dd->irq_work_queue);
+	destroy_workqueue(dd->irq_work_queue);
+
+	kfree(dd);
+}
+
+static int __devinit ab8500_acc_detect_probe(struct platform_device *pdev)
+{
+	return ab8500_accessory_init(pdev);
+}
+
+
+static int __devexit ab8500_acc_detect_remove(struct platform_device *pdev)
+{
+	ab8500_accessory_cleanup(platform_get_drvdata(pdev));
+	platform_set_drvdata(pdev, NULL);
+
+	return 0;
+}
+
+#if defined(CONFIG_PM)
+static int ab8500_acc_detect_suspend(struct platform_device *pdev,
+			pm_message_t state)
+{
+	struct ab8500_ad *dd = platform_get_drvdata(pdev);
+
+	dev_dbg(&dd->pdev->dev, "%s: Enter\n", __func__);
+
+	cancel_delayed_work_sync(&dd->unplug_irq_work);
+	cancel_delayed_work_sync(&dd->detect_work);
+	cancel_delayed_work_sync(&dd->init_work);
+
+	return 0;
+}
+
+static int ab8500_acc_detect_resume(struct platform_device *pdev)
+{
+	struct ab8500_ad *dd = platform_get_drvdata(pdev);
+
+	dev_dbg(&dd->pdev->dev, "%s: Enter\n", __func__);
+
+	/* After resume, reinitialize */
+	dd->gpio35_dir_set = dd->accdet1_th_set = dd->accdet2_th_set = 0;
+	queue_delayed_work(dd->irq_work_queue, &dd->init_work, 0);
+
+	return 0;
+}
+#else
+#define ab8500_acc_detect_suspend	NULL
+#define ab8500_acc_detect_resume	NULL
+#endif
+
+static struct platform_driver ab8500_acc_detect_platform_driver = {
+	.driver = {
+		.name = "ab8500-acc-det",
+		.owner = THIS_MODULE,
+	},
+	.probe = ab8500_acc_detect_probe,
+	.remove	= __devexit_p(ab8500_acc_detect_remove),
+	.suspend = ab8500_acc_detect_suspend,
+	.resume = ab8500_acc_detect_resume,
+};
+
+static int __init ab8500_acc_detect_init(void)
+{
+	return platform_driver_register(&ab8500_acc_detect_platform_driver);
+}
+
+static void __exit ab8500_acc_detect_exit(void)
+{
+	platform_driver_unregister(&ab8500_acc_detect_platform_driver);
+}
+
+module_init(ab8500_acc_detect_init);
+module_exit(ab8500_acc_detect_exit);
+
+MODULE_DESCRIPTION("AB8500 AV Accessory detection driver");
+MODULE_ALIAS("platform:ab8500-acc-det");
+MODULE_AUTHOR("ST-Ericsson");
+MODULE_LICENSE("GPL v2");