misc: Add driver support for MAX8997 MUIC

The MUIC function in MAX8997 device can be used as
a USB port detector and switch.
This patch supports the MUIC feature of MAX8997.
Signed-off-by: Donggeun Kim <dg77.kim@samsung.com>
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

drivers/misc/Kconfig

@@ -500,6 +500,14 @@ config USB_SWITCH_FSA9480
 	  stereo and mono audio, video, microphone and UART data to use
 	  a common connector port.
 
+config MAX8997_MUIC
+	tristate "MAX8997 MUIC Support"
+	depends on MFD_MAX8997
+	help
+	  If you say yes here you get support for the MUIC device of
+	  Maxim MAX8997 PMIC.
+	  The MAX8997 MUIC is a USB port accessory detector and switch.
+
 source "drivers/misc/c2port/Kconfig"
 source "drivers/misc/eeprom/Kconfig"
 source "drivers/misc/cb710/Kconfig"

drivers/misc/Makefile

@@ -48,3 +48,4 @@ obj-y				+= lis3lv02d/
 obj-y				+= carma/
 obj-$(CONFIG_USB_SWITCH_FSA9480) += fsa9480.o
 obj-$(CONFIG_ALTERA_STAPL)	+=altera-stapl/
+obj-$(CONFIG_MAX8997_MUIC)	+= max8997-muic.o

drivers/misc/max8997-muic.c

+/*
+ * max8997-muic.c - MAX8997 muic driver for the Maxim 8997
+ *
+ *  Copyright (C) 2011 Samsung Electrnoics
+ *  Donggeun Kim <dg77.kim@samsung.com>
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+#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/platform_device.h>
+#include <linux/kobject.h>
+#include <linux/mfd/max8997.h>
+#include <linux/mfd/max8997-private.h>
+
+/* MAX8997-MUIC STATUS1 register */
+#define STATUS1_ADC_SHIFT		0
+#define STATUS1_ADCLOW_SHIFT		5
+#define STATUS1_ADCERR_SHIFT		6
+#define STATUS1_ADC_MASK		(0x1f << STATUS1_ADC_SHIFT)
+#define STATUS1_ADCLOW_MASK		(0x1 << STATUS1_ADCLOW_SHIFT)
+#define STATUS1_ADCERR_MASK		(0x1 << STATUS1_ADCERR_SHIFT)
+
+/* MAX8997-MUIC STATUS2 register */
+#define STATUS2_CHGTYP_SHIFT		0
+#define STATUS2_CHGDETRUN_SHIFT		3
+#define STATUS2_DCDTMR_SHIFT		4
+#define STATUS2_DBCHG_SHIFT		5
+#define STATUS2_VBVOLT_SHIFT		6
+#define STATUS2_CHGTYP_MASK		(0x7 << STATUS2_CHGTYP_SHIFT)
+#define STATUS2_CHGDETRUN_MASK		(0x1 << STATUS2_CHGDETRUN_SHIFT)
+#define STATUS2_DCDTMR_MASK		(0x1 << STATUS2_DCDTMR_SHIFT)
+#define STATUS2_DBCHG_MASK		(0x1 << STATUS2_DBCHG_SHIFT)
+#define STATUS2_VBVOLT_MASK		(0x1 << STATUS2_VBVOLT_SHIFT)
+
+/* MAX8997-MUIC STATUS3 register */
+#define STATUS3_OVP_SHIFT		2
+#define STATUS3_OVP_MASK		(0x1 << STATUS3_OVP_SHIFT)
+
+/* MAX8997-MUIC CONTROL1 register */
+#define COMN1SW_SHIFT			0
+#define COMP2SW_SHIFT			3
+#define COMN1SW_MASK			(0x7 << COMN1SW_SHIFT)
+#define COMP2SW_MASK			(0x7 << COMP2SW_SHIFT)
+#define SW_MASK				(COMP2SW_MASK | COMN1SW_MASK)
+
+#define MAX8997_SW_USB		((1 << COMP2SW_SHIFT) | (1 << COMN1SW_SHIFT))
+#define MAX8997_SW_AUDIO	((2 << COMP2SW_SHIFT) | (2 << COMN1SW_SHIFT))
+#define MAX8997_SW_UART		((3 << COMP2SW_SHIFT) | (3 << COMN1SW_SHIFT))
+#define MAX8997_SW_OPEN		((0 << COMP2SW_SHIFT) | (0 << COMN1SW_SHIFT))
+
+#define	MAX8997_ADC_GROUND		0x00
+#define	MAX8997_ADC_MHL			0x01
+#define	MAX8997_ADC_JIG_USB_1		0x18
+#define	MAX8997_ADC_JIG_USB_2		0x19
+#define	MAX8997_ADC_DESKDOCK		0x1a
+#define	MAX8997_ADC_JIG_UART		0x1c
+#define	MAX8997_ADC_CARDOCK		0x1d
+#define	MAX8997_ADC_OPEN		0x1f
+
+struct max8997_muic_irq {
+	unsigned int irq;
+	const char *name;
+};
+
+static struct max8997_muic_irq muic_irqs[] = {
+	{ MAX8997_MUICIRQ_ADCError, "muic-ADC_error" },
+	{ MAX8997_MUICIRQ_ADCLow, "muic-ADC_low" },
+	{ MAX8997_MUICIRQ_ADC, "muic-ADC" },
+	{ MAX8997_MUICIRQ_VBVolt, "muic-VB_voltage" },
+	{ MAX8997_MUICIRQ_DBChg, "muic-DB_charger" },
+	{ MAX8997_MUICIRQ_DCDTmr, "muic-DCD_timer" },
+	{ MAX8997_MUICIRQ_ChgDetRun, "muic-CDR_status" },
+	{ MAX8997_MUICIRQ_ChgTyp, "muic-charger_type" },
+	{ MAX8997_MUICIRQ_OVP, "muic-over_voltage" },
+};
+
+struct max8997_muic_info {
+	struct device *dev;
+	struct max8997_dev *iodev;
+	struct i2c_client *muic;
+	struct max8997_muic_platform_data *muic_pdata;
+
+	int irq;
+	struct work_struct irq_work;
+
+	enum max8997_muic_charger_type pre_charger_type;
+	int pre_adc;
+
+	struct mutex mutex;
+};
+
+static int max8997_muic_handle_usb(struct max8997_muic_info *info,
+			enum max8997_muic_usb_type usb_type, bool attached)
+{
+	struct max8997_muic_platform_data *mdata = info->muic_pdata;
+	int ret = 0;
+
+	if (usb_type == MAX8997_USB_HOST) {
+		/* switch to USB */
+		ret = max8997_update_reg(info->muic, MAX8997_MUIC_REG_CONTROL1,
+				attached ? MAX8997_SW_USB : MAX8997_SW_OPEN,
+				SW_MASK);
+		if (ret) {
+			dev_err(info->dev, "failed to update muic register\n");
+			goto out;
+		}
+	}
+
+	if (mdata->usb_callback)
+		mdata->usb_callback(usb_type, attached);
+out:
+	return ret;
+}
+
+static void max8997_muic_handle_mhl(struct max8997_muic_info *info,
+			bool attached)
+{
+	struct max8997_muic_platform_data *mdata = info->muic_pdata;
+
+	if (mdata->mhl_callback)
+		mdata->mhl_callback(attached);
+}
+
+static int max8997_muic_handle_dock(struct max8997_muic_info *info,
+			int adc, bool attached)
+{
+	struct max8997_muic_platform_data *mdata = info->muic_pdata;
+	int ret = 0;
+
+	/* switch to AUDIO */
+	ret = max8997_update_reg(info->muic, MAX8997_MUIC_REG_CONTROL1,
+				attached ? MAX8997_SW_AUDIO : MAX8997_SW_OPEN,
+				SW_MASK);
+	if (ret) {
+		dev_err(info->dev, "failed to update muic register\n");
+		goto out;
+	}
+
+	switch (adc) {
+	case MAX8997_ADC_DESKDOCK:
+		if (mdata->deskdock_callback)
+			mdata->deskdock_callback(attached);
+		break;
+	case MAX8997_ADC_CARDOCK:
+		if (mdata->cardock_callback)
+			mdata->cardock_callback(attached);
+		break;
+	default:
+		break;
+	}
+out:
+	return ret;
+}
+
+static int max8997_muic_handle_jig_uart(struct max8997_muic_info *info,
+			bool attached)
+{
+	struct max8997_muic_platform_data *mdata = info->muic_pdata;
+	int ret = 0;
+
+	/* switch to UART */
+	ret = max8997_update_reg(info->muic, MAX8997_MUIC_REG_CONTROL1,
+				attached ? MAX8997_SW_UART : MAX8997_SW_OPEN,
+				SW_MASK);
+	if (ret) {
+		dev_err(info->dev, "failed to update muic register\n");
+		goto out;
+	}
+
+	if (mdata->uart_callback)
+		mdata->uart_callback(attached);
+out:
+	return ret;
+}
+
+static int max8997_muic_handle_adc_detach(struct max8997_muic_info *info)
+{
+	int ret = 0;
+
+	switch (info->pre_adc) {
+	case MAX8997_ADC_GROUND:
+		ret = max8997_muic_handle_usb(info, MAX8997_USB_HOST, false);
+		break;
+	case MAX8997_ADC_MHL:
+		max8997_muic_handle_mhl(info, false);
+		break;
+	case MAX8997_ADC_JIG_USB_1:
+	case MAX8997_ADC_JIG_USB_2:
+		ret = max8997_muic_handle_usb(info, MAX8997_USB_DEVICE, false);
+		break;
+	case MAX8997_ADC_DESKDOCK:
+	case MAX8997_ADC_CARDOCK:
+		ret = max8997_muic_handle_dock(info, info->pre_adc, false);
+		break;
+	case MAX8997_ADC_JIG_UART:
+		ret = max8997_muic_handle_jig_uart(info, false);
+		break;
+	default:
+		break;
+	}
+
+	return ret;
+}
+
+static int max8997_muic_handle_adc(struct max8997_muic_info *info, int adc)
+{
+	int ret = 0;
+
+	switch (adc) {
+	case MAX8997_ADC_GROUND:
+		ret = max8997_muic_handle_usb(info, MAX8997_USB_HOST, true);
+		break;
+	case MAX8997_ADC_MHL:
+		max8997_muic_handle_mhl(info, true);
+		break;
+	case MAX8997_ADC_JIG_USB_1:
+	case MAX8997_ADC_JIG_USB_2:
+		ret = max8997_muic_handle_usb(info, MAX8997_USB_DEVICE, true);
+		break;
+	case MAX8997_ADC_DESKDOCK:
+	case MAX8997_ADC_CARDOCK:
+		ret = max8997_muic_handle_dock(info, adc, true);
+		break;
+	case MAX8997_ADC_JIG_UART:
+		ret = max8997_muic_handle_jig_uart(info, true);
+		break;
+	case MAX8997_ADC_OPEN:
+		ret = max8997_muic_handle_adc_detach(info);
+		break;
+	default:
+		break;
+	}
+
+	info->pre_adc = adc;
+
+	return ret;
+}
+
+static int max8997_muic_handle_charger_type(struct max8997_muic_info *info,
+				enum max8997_muic_charger_type charger_type)
+{
+	struct max8997_muic_platform_data *mdata = info->muic_pdata;
+	u8 adc;
+	int ret;
+
+	ret = max8997_read_reg(info->muic, MAX8997_MUIC_REG_STATUS1, &adc);
+	if (ret) {
+		dev_err(info->dev, "failed to read muic register\n");
+		goto out;
+	}
+
+	switch (charger_type) {
+	case MAX8997_CHARGER_TYPE_NONE:
+		if (mdata->charger_callback)
+			mdata->charger_callback(false, charger_type);
+		if (info->pre_charger_type == MAX8997_CHARGER_TYPE_USB) {
+			max8997_muic_handle_usb(info,
+					MAX8997_USB_DEVICE, false);
+		}
+		break;
+	case MAX8997_CHARGER_TYPE_USB:
+		if ((adc & STATUS1_ADC_MASK) == MAX8997_ADC_OPEN) {
+			max8997_muic_handle_usb(info,
+					MAX8997_USB_DEVICE, true);
+		}
+		if (mdata->charger_callback)
+			mdata->charger_callback(true, charger_type);
+		break;
+	case MAX8997_CHARGER_TYPE_DOWNSTREAM_PORT:
+	case MAX8997_CHARGER_TYPE_DEDICATED_CHG:
+	case MAX8997_CHARGER_TYPE_500MA:
+	case MAX8997_CHARGER_TYPE_1A:
+		if (mdata->charger_callback)
+			mdata->charger_callback(true, charger_type);
+		break;
+	default:
+		break;
+	}
+
+	info->pre_charger_type = charger_type;
+out:
+	return ret;
+}
+
+static void max8997_muic_irq_work(struct work_struct *work)
+{
+	struct max8997_muic_info *info = container_of(work,
+			struct max8997_muic_info, irq_work);
+	struct max8997_platform_data *pdata =
+				dev_get_platdata(info->iodev->dev);
+	char env_name_str[30], env_state_str[15];
+	char *envp[] = { env_name_str, env_state_str, NULL };
+	u8 status[3];
+	u8 adc, adc_low, adc_err;
+	u8 vb_volt, db_chg, dcd_tmr, cdr, chg_type, ovp;
+
+	int irq_type = info->irq - pdata->irq_base;
+	int ret;
+
+	mutex_lock(&info->mutex);
+
+	ret = max8997_bulk_read(info->muic, MAX8997_MUIC_REG_STATUS1,
+				3, status);
+	if (ret) {
+		dev_err(info->dev, "failed to read muic register\n");
+		mutex_unlock(&info->mutex);
+		return;
+	}
+
+	dev_dbg(info->dev, "%s: STATUS1:0x%x, 2:0x%x\n", __func__,
+			status[0], status[1]);
+
+	switch (irq_type) {
+	case MAX8997_MUICIRQ_ADCError:
+		adc_err = status[0] & STATUS1_ADCERR_MASK;
+		adc_err >>= STATUS1_ADCERR_SHIFT;
+		sprintf(env_name_str, "IRQ=%s", "ADC_Error");
+		sprintf(env_state_str, "STATE=%d", adc_err);
+		break;
+	case MAX8997_MUICIRQ_ADCLow:
+		adc_low = status[0] & STATUS1_ADCLOW_MASK;
+		adc_low >>= STATUS1_ADCLOW_SHIFT;
+		sprintf(env_name_str, "IRQ=%s", "ADC_Low");
+		sprintf(env_state_str, "STATE=%d", adc_low);
+		break;
+	case MAX8997_MUICIRQ_ADC:
+		adc = status[0] & STATUS1_ADC_MASK;
+		adc >>= STATUS1_ADC_SHIFT;
+
+		max8997_muic_handle_adc(info, adc);
+
+		sprintf(env_name_str, "IRQ=%s", "ADC");
+		sprintf(env_state_str, "STATE=%d", adc);
+		break;
+	case MAX8997_MUICIRQ_VBVolt:
+		vb_volt = status[1] & STATUS2_VBVOLT_MASK;
+		vb_volt >>= STATUS2_VBVOLT_SHIFT;
+		sprintf(env_name_str, "IRQ=%s", "VB_Volt");
+		sprintf(env_state_str, "STATE=%d", vb_volt);
+		break;
+	case MAX8997_MUICIRQ_DBChg:
+		db_chg = status[1] & STATUS2_DBCHG_MASK;
+		db_chg >>= STATUS2_DBCHG_SHIFT;
+		sprintf(env_name_str, "IRQ=%s", "DB_CHARGER");
+		sprintf(env_state_str, "STATE=%d", db_chg);
+		break;
+	case MAX8997_MUICIRQ_DCDTmr:
+		dcd_tmr = status[1] & STATUS2_DCDTMR_MASK;
+		dcd_tmr >>= STATUS2_DCDTMR_SHIFT;
+		sprintf(env_name_str, "IRQ=%s", "DCD_TIMER");
+		sprintf(env_state_str, "STATE=%d", dcd_tmr);
+		break;
+	case MAX8997_MUICIRQ_ChgDetRun:
+		cdr = status[1] & STATUS2_CHGDETRUN_MASK;
+		cdr >>= STATUS2_CHGDETRUN_SHIFT;
+		sprintf(env_name_str, "IRQ=%s", "CHG_DET_RUN");
+		sprintf(env_state_str, "STATE=%d", cdr);
+		break;
+	case MAX8997_MUICIRQ_ChgTyp:
+		chg_type = status[1] & STATUS2_CHGTYP_MASK;
+		chg_type >>= STATUS2_CHGTYP_SHIFT;
+
+		max8997_muic_handle_charger_type(info, chg_type);
+
+		sprintf(env_name_str, "IRQ=%s", "CHARGER_TYPE");
+		sprintf(env_state_str, "STATE=%d", chg_type);
+		break;
+	case MAX8997_MUICIRQ_OVP:
+		ovp = status[2] & STATUS3_OVP_MASK;
+		ovp >>= STATUS3_OVP_SHIFT;
+		sprintf(env_name_str, "IRQ=%s", "OVER-VOLTAGE");
+		sprintf(env_state_str, "STATE=%d", ovp);
+		break;
+	default:
+		break;
+	}
+
+	kobject_uevent_env(&info->dev->kobj, KOBJ_CHANGE, envp);
+
+	mutex_unlock(&info->mutex);
+
+	return;
+}
+
+static irqreturn_t max8997_muic_irq_handler(int irq, void *data)
+{
+	struct max8997_muic_info *info = data;
+
+	dev_dbg(info->dev, "irq:%d\n", irq);
+	info->irq = irq;
+
+	schedule_work(&info->irq_work);
+
+	return IRQ_HANDLED;
+}
+
+static void max8997_muic_detect_dev(struct max8997_muic_info *info)
+{
+	int ret;
+	u8 status[2], adc, chg_type;
+
+	ret = max8997_bulk_read(info->muic, MAX8997_MUIC_REG_STATUS1,
+				2, status);
+	if (ret) {
+		dev_err(info->dev, "failed to read muic register\n");
+		return;
+	}
+
+	dev_info(info->dev, "STATUS1:0x%x, STATUS2:0x%x\n",
+			status[0], status[1]);
+
+	adc = status[0] & STATUS1_ADC_MASK;
+	adc >>= STATUS1_ADC_SHIFT;
+
+	chg_type = status[1] & STATUS2_CHGTYP_MASK;
+	chg_type >>= STATUS2_CHGTYP_SHIFT;
+
+	max8997_muic_handle_adc(info, adc);
+	max8997_muic_handle_charger_type(info, chg_type);
+}
+
+static ssize_t max8997_muic_show_manualsw(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct max8997_muic_info *info = dev_get_drvdata(dev);
+	int ret;
+	u8 value, manual_switch;
+
+	ret = max8997_read_reg(info->muic, MAX8997_MUIC_REG_CONTROL1, &value);
+	if (ret) {
+		dev_err(info->dev, "failed to read muic register\n");
+		return sprintf(buf, "UNKNOWN\n");
+	}
+
+	manual_switch = value & (COMN1SW_MASK | COMP2SW_MASK);
+
+	switch (manual_switch) {
+	case MAX8997_SW_USB:
+		return sprintf(buf, "USB\n");
+	case MAX8997_SW_AUDIO:
+		return sprintf(buf, "AUDIO\n");
+	case MAX8997_SW_UART:
+		return sprintf(buf, "UART\n");
+	default:
+		return sprintf(buf, "OPEN\n");
+	}
+}
+
+static ssize_t max8997_muic_store_manualsw(struct device *dev,
+				    struct device_attribute *attr,
+				    const char *buf, size_t count)
+{
+	struct max8997_muic_info *info = dev_get_drvdata(dev);
+	int ret;
+	u8 manual_switch;
+
+	if (!strncmp(buf, "USB", 3)) {
+		manual_switch = MAX8997_SW_USB;
+	} else if (!strncmp(buf, "AUDIO", 5)) {
+		manual_switch = MAX8997_SW_AUDIO;
+	} else if (!strncmp(buf, "UART", 4)) {
+		manual_switch = MAX8997_SW_UART;
+	} else if (!strncmp(buf, "OPEN", 4)) {
+		manual_switch = MAX8997_SW_OPEN;
+	} else {
+		dev_err(info->dev, "invalid parameter\n");
+		goto out;
+	}
+
+	ret = max8997_update_reg(info->muic, MAX8997_MUIC_REG_CONTROL1,
+			manual_switch, SW_MASK);
+	if (ret)
+		dev_err(info->dev, "failed to update muic register\n");
+out:
+	return count;
+}
+
+static DEVICE_ATTR(switch, S_IRUGO | S_IWUSR,
+		max8997_muic_show_manualsw, max8997_muic_store_manualsw);
+
+static struct attribute *max8997_muic_attributes[] = {
+	&dev_attr_switch.attr,
+	NULL
+};
+
+static const struct attribute_group max8997_muic_group = {
+	.attrs = max8997_muic_attributes,
+};
+
+static void max8997_initialize_device(struct max8997_muic_info *info)
+{
+	struct max8997_muic_platform_data *mdata = info->muic_pdata;
+	int i;
+
+	for (i = 0; i < mdata->num_init_data; i++) {
+		max8997_write_reg(info->muic, mdata->init_data[i].addr,
+				mdata->init_data[i].data);
+	}
+}
+
+static int __devinit max8997_muic_probe(struct platform_device *pdev)
+{
+	struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
+	struct max8997_platform_data *pdata = dev_get_platdata(iodev->dev);
+	struct max8997_muic_info *info;
+	int ret, i;
+
+	info = kzalloc(sizeof(struct max8997_muic_info), GFP_KERNEL);
+	if (!info) {
+		dev_err(&pdev->dev, "failed to allocate memory\n");
+		ret = -ENOMEM;
+		goto err_kfree;
+	}
+
+	if (!pdata->muic_pdata) {
+		dev_err(&pdev->dev, "failed to get platform_data\n");
+		ret = -EINVAL;
+		goto err_pdata;
+	}
+	info->muic_pdata = pdata->muic_pdata;
+
+	info->dev = &pdev->dev;
+	info->iodev = iodev;
+	info->muic = iodev->muic;
+
+	platform_set_drvdata(pdev, info);
+	mutex_init(&info->mutex);
+
+	ret = sysfs_create_group(&pdev->dev.kobj, &max8997_muic_group);
+	if (ret) {
+		dev_err(&pdev->dev,
+			"failed to create max8997 muic attribute group\n");
+		goto err_sysfs;
+	}
+
+	INIT_WORK(&info->irq_work, max8997_muic_irq_work);
+
+	for (i = 0; i < ARRAY_SIZE(muic_irqs); i++) {
+		struct max8997_muic_irq *muic_irq = &muic_irqs[i];
+
+		ret = request_threaded_irq(pdata->irq_base + muic_irq->irq,
+				NULL, max8997_muic_irq_handler,
+				0, muic_irq->name,
+				info);
+		if (ret) {
+			dev_err(&pdev->dev,
+				"failed: irq request (IRQ: %d,"
+				" error :%d)\n",
+				muic_irq->irq, ret);
+
+			for (i = i - 1; i >= 0; i--)
+				free_irq(muic_irq->irq, info);
+
+			goto err_irq;
+		}
+	}
+
+	/* Initialize registers according to platform data */
+	max8997_initialize_device(info);
+
+	/* Initial device detection */
+	max8997_muic_detect_dev(info);
+
+	return ret;
+
+err_irq:
+	sysfs_remove_group(&pdev->dev.kobj, &max8997_muic_group);
+err_sysfs:
+err_pdata:
+	kfree(info);
+err_kfree:
+	return ret;
+}
+
+static int __devexit max8997_muic_remove(struct platform_device *pdev)
+{
+	struct max8997_muic_info *info = platform_get_drvdata(pdev);
+	struct max8997_platform_data *pdata =
+				dev_get_platdata(info->iodev->dev);
+	int i;
+
+	sysfs_remove_group(&pdev->dev.kobj, &max8997_muic_group);
+
+	for (i = 0; i < ARRAY_SIZE(muic_irqs); i++)
+		free_irq(pdata->irq_base + muic_irqs[i].irq, info);
+
+	kfree(info);
+
+	return 0;
+}
+
+static struct platform_driver max8997_muic_driver = {
+	.driver		= {
+		.name	= "max8997-muic",
+		.owner	= THIS_MODULE,
+	},
+	.probe		= max8997_muic_probe,
+	.remove		= __devexit_p(max8997_muic_remove),
+};
+
+static int __init max8997_muic_init(void)
+{
+	return platform_driver_register(&max8997_muic_driver);
+}
+module_init(max8997_muic_init);
+
+static void __exit max8997_muic_exit(void)
+{
+	platform_driver_unregister(&max8997_muic_driver);
+}
+module_exit(max8997_muic_exit);
+
+MODULE_DESCRIPTION("Maxim MAX8997 MUIC driver");
+MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>");
+MODULE_LICENSE("GPL");