drivers/misc/max8997-muic.c - kernel/windcharger - Git at Google

 /*
  * 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);
 	u8 status[3];
 	u8 adc, chg_type;

 	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_ADC:
 		adc = status[0] & STATUS1_ADC_MASK;
 		adc >>= STATUS1_ADC_SHIFT;

 		max8997_muic_handle_adc(info, adc);
 		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);
 		break;
 	default:
 		dev_info(info->dev, "misc interrupt: %s occurred\n",
 			 muic_irqs[irq_type].name);
 		break;
 	}

 	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 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);

 	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:
 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;

 	for (i = 0; i < ARRAY_SIZE(muic_irqs); i++)
 		free_irq(pdata->irq_base + muic_irqs[i].irq, info);
 	cancel_work_sync(&info->irq_work);

 	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");
	/*
	* 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);
	u8 status[3];
	u8 adc, chg_type;

	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_ADC:
	adc = status[0] & STATUS1_ADC_MASK;
	adc >>= STATUS1_ADC_SHIFT;

	max8997_muic_handle_adc(info, adc);
	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);
	break;
	default:
	dev_info(info->dev, "misc interrupt: %s occurred\n",
	muic_irqs[irq_type].name);
	break;
	}

	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 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);

	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:
	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;

	for (i = 0; i < ARRAY_SIZE(muic_irqs); i++)
	free_irq(pdata->irq_base + muic_irqs[i].irq, info);
	cancel_work_sync(&info->irq_work);

	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");