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>

3 files changed, 643 insertions, 0 deletions

diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index 5664696f2d3a..6a1a092db146 100644
--- a/drivers/misc/Kconfig
+++ b/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"
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index b26495a02554..3e1d80106f04 100644
--- a/drivers/misc/Makefile
+++ b/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
diff --git a/drivers/misc/max8997-muic.c b/drivers/misc/max8997-muic.c
new file mode 100644
index 000000000000..74a9448a93d2
--- /dev/null
+++ b/drivers/misc/max8997-muic.c
@@ -0,0 +1,634 @@
+/*
+ * 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");