[mirror_ubuntu-bionic-kernel.git] / drivers / extcon / extcon-sm5502.c

/*
 * extcon-sm5502.c - Silicon Mitus SM5502 extcon drvier to support USB switches
 *
 * Copyright (c) 2014 Samsung Electronics Co., Ltd
 * Author: Chanwoo Choi <cw00.choi@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.
 */

#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/irqdomain.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <linux/extcon.h>
#include <linux/extcon/sm5502.h>

#define	DELAY_MS_DEFAULT		17000	/* unit: millisecond */

struct muic_irq {
	unsigned int irq;
	const char *name;
	unsigned int virq;
};

struct reg_data {
	u8 reg;
	unsigned int val;
	bool invert;
};

struct sm5502_muic_info {
	struct device *dev;
	struct extcon_dev *edev;

	struct i2c_client *i2c;
	struct regmap *regmap;

	struct regmap_irq_chip_data *irq_data;
	struct muic_irq *muic_irqs;
	unsigned int num_muic_irqs;
	int irq;
	bool irq_attach;
	bool irq_detach;
	struct work_struct irq_work;

	struct reg_data *reg_data;
	unsigned int num_reg_data;

	struct mutex mutex;

	/*
	 * Use delayed workqueue to detect cable state and then
	 * notify cable state to notifiee/platform through uevent.
	 * After completing the booting of platform, the extcon provider
	 * driver should notify cable state to upper layer.
	 */
	struct delayed_work wq_detcable;
};

/* Default value of SM5502 register to bring up MUIC device. */
static struct reg_data sm5502_reg_data[] = {
	{
		.reg = SM5502_REG_CONTROL,
		.val = SM5502_REG_CONTROL_MASK_INT_MASK,
		.invert = false,
	}, {
		.reg = SM5502_REG_INTMASK1,
		.val = SM5502_REG_INTM1_KP_MASK
			| SM5502_REG_INTM1_LKP_MASK
			| SM5502_REG_INTM1_LKR_MASK,
		.invert = true,
	}, {
		.reg = SM5502_REG_INTMASK2,
		.val = SM5502_REG_INTM2_VBUS_DET_MASK
			| SM5502_REG_INTM2_REV_ACCE_MASK
			| SM5502_REG_INTM2_ADC_CHG_MASK
			| SM5502_REG_INTM2_STUCK_KEY_MASK
			| SM5502_REG_INTM2_STUCK_KEY_RCV_MASK
			| SM5502_REG_INTM2_MHL_MASK,
		.invert = true,
	},
	{ }
};

/* List of detectable cables */
enum {
	EXTCON_CABLE_USB = 0,
	EXTCON_CABLE_USB_HOST,
	EXTCON_CABLE_TA,

	EXTCON_CABLE_END,
};

static const char *sm5502_extcon_cable[] = {
	[EXTCON_CABLE_USB]	= "USB",
	[EXTCON_CABLE_USB_HOST]	= "USB-Host",
	[EXTCON_CABLE_TA]	= "TA",
	NULL,
};

/* Define supported accessory type */
enum sm5502_muic_acc_type {
	SM5502_MUIC_ADC_GROUND = 0x0,
	SM5502_MUIC_ADC_SEND_END_BUTTON,
	SM5502_MUIC_ADC_REMOTE_S1_BUTTON,
	SM5502_MUIC_ADC_REMOTE_S2_BUTTON,
	SM5502_MUIC_ADC_REMOTE_S3_BUTTON,
	SM5502_MUIC_ADC_REMOTE_S4_BUTTON,
	SM5502_MUIC_ADC_REMOTE_S5_BUTTON,
	SM5502_MUIC_ADC_REMOTE_S6_BUTTON,
	SM5502_MUIC_ADC_REMOTE_S7_BUTTON,
	SM5502_MUIC_ADC_REMOTE_S8_BUTTON,
	SM5502_MUIC_ADC_REMOTE_S9_BUTTON,
	SM5502_MUIC_ADC_REMOTE_S10_BUTTON,
	SM5502_MUIC_ADC_REMOTE_S11_BUTTON,
	SM5502_MUIC_ADC_REMOTE_S12_BUTTON,
	SM5502_MUIC_ADC_RESERVED_ACC_1,
	SM5502_MUIC_ADC_RESERVED_ACC_2,
	SM5502_MUIC_ADC_RESERVED_ACC_3,
	SM5502_MUIC_ADC_RESERVED_ACC_4,
	SM5502_MUIC_ADC_RESERVED_ACC_5,
	SM5502_MUIC_ADC_AUDIO_TYPE2,
	SM5502_MUIC_ADC_PHONE_POWERED_DEV,
	SM5502_MUIC_ADC_TTY_CONVERTER,
	SM5502_MUIC_ADC_UART_CABLE,
	SM5502_MUIC_ADC_TYPE1_CHARGER,
	SM5502_MUIC_ADC_FACTORY_MODE_BOOT_OFF_USB,
	SM5502_MUIC_ADC_FACTORY_MODE_BOOT_ON_USB,
	SM5502_MUIC_ADC_AUDIO_VIDEO_CABLE,
	SM5502_MUIC_ADC_TYPE2_CHARGER,
	SM5502_MUIC_ADC_FACTORY_MODE_BOOT_OFF_UART,
	SM5502_MUIC_ADC_FACTORY_MODE_BOOT_ON_UART,
	SM5502_MUIC_ADC_AUDIO_TYPE1,
	SM5502_MUIC_ADC_OPEN = 0x1f,

	/* The below accessories have same ADC value (0x1f or 0x1e).
	   So, Device type1 is used to separate specific accessory. */
							/* |---------|--ADC| */
							/* |    [7:5]|[4:0]| */
	SM5502_MUIC_ADC_AUDIO_TYPE1_FULL_REMOTE = 0x3e,	/* |      001|11110| */
	SM5502_MUIC_ADC_AUDIO_TYPE1_SEND_END = 0x5e,	/* |      010|11110| */
							/* |Dev Type1|--ADC| */
	SM5502_MUIC_ADC_OPEN_USB = 0x5f,		/* |      010|11111| */
	SM5502_MUIC_ADC_OPEN_TA = 0xdf,			/* |      110|11111| */
	SM5502_MUIC_ADC_OPEN_USB_OTG = 0xff,		/* |      111|11111| */
};

/* List of supported interrupt for SM5502 */
static struct muic_irq sm5502_muic_irqs[] = {
	{ SM5502_IRQ_INT1_ATTACH,	"muic-attach" },
	{ SM5502_IRQ_INT1_DETACH,	"muic-detach" },
	{ SM5502_IRQ_INT1_KP,		"muic-kp" },
	{ SM5502_IRQ_INT1_LKP,		"muic-lkp" },
	{ SM5502_IRQ_INT1_LKR,		"muic-lkr" },
	{ SM5502_IRQ_INT1_OVP_EVENT,	"muic-ovp-event" },
	{ SM5502_IRQ_INT1_OCP_EVENT,	"muic-ocp-event" },
	{ SM5502_IRQ_INT1_OVP_OCP_DIS,	"muic-ovp-ocp-dis" },
	{ SM5502_IRQ_INT2_VBUS_DET,	"muic-vbus-det" },
	{ SM5502_IRQ_INT2_REV_ACCE,	"muic-rev-acce" },
	{ SM5502_IRQ_INT2_ADC_CHG,	"muic-adc-chg" },
	{ SM5502_IRQ_INT2_STUCK_KEY,	"muic-stuck-key" },
	{ SM5502_IRQ_INT2_STUCK_KEY_RCV, "muic-stuck-key-rcv" },
	{ SM5502_IRQ_INT2_MHL,		"muic-mhl" },
};

/* Define interrupt list of SM5502 to register regmap_irq */
static const struct regmap_irq sm5502_irqs[] = {
	/* INT1 interrupts */
	{ .reg_offset = 0, .mask = SM5502_IRQ_INT1_ATTACH_MASK, },
	{ .reg_offset = 0, .mask = SM5502_IRQ_INT1_DETACH_MASK, },
	{ .reg_offset = 0, .mask = SM5502_IRQ_INT1_KP_MASK, },
	{ .reg_offset = 0, .mask = SM5502_IRQ_INT1_LKP_MASK, },
	{ .reg_offset = 0, .mask = SM5502_IRQ_INT1_LKR_MASK, },
	{ .reg_offset = 0, .mask = SM5502_IRQ_INT1_OVP_EVENT_MASK, },
	{ .reg_offset = 0, .mask = SM5502_IRQ_INT1_OCP_EVENT_MASK, },
	{ .reg_offset = 0, .mask = SM5502_IRQ_INT1_OVP_OCP_DIS_MASK, },

	/* INT2 interrupts */
	{ .reg_offset = 1, .mask = SM5502_IRQ_INT2_VBUS_DET_MASK,},
	{ .reg_offset = 1, .mask = SM5502_IRQ_INT2_REV_ACCE_MASK, },
	{ .reg_offset = 1, .mask = SM5502_IRQ_INT2_ADC_CHG_MASK, },
	{ .reg_offset = 1, .mask = SM5502_IRQ_INT2_STUCK_KEY_MASK, },
	{ .reg_offset = 1, .mask = SM5502_IRQ_INT2_STUCK_KEY_RCV_MASK, },
	{ .reg_offset = 1, .mask = SM5502_IRQ_INT2_MHL_MASK, },
};

static const struct regmap_irq_chip sm5502_muic_irq_chip = {
	.name			= "sm5502",
	.status_base		= SM5502_REG_INT1,
	.mask_base		= SM5502_REG_INTMASK1,
	.mask_invert		= false,
	.num_regs		= 2,
	.irqs			= sm5502_irqs,
	.num_irqs		= ARRAY_SIZE(sm5502_irqs),
};

/* Define regmap configuration of SM5502 for I2C communication  */
static bool sm5502_muic_volatile_reg(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case SM5502_REG_INTMASK1:
	case SM5502_REG_INTMASK2:
		return true;
	default:
		break;
	}
	return false;
}

static const struct regmap_config sm5502_muic_regmap_config = {
	.reg_bits	= 8,
	.val_bits	= 8,
	.volatile_reg	= sm5502_muic_volatile_reg,
	.max_register	= SM5502_REG_END,
};

/* Return cable type of attached or detached accessories */
static unsigned int sm5502_muic_get_cable_type(struct sm5502_muic_info *info)
{
	unsigned int cable_type = -1, adc, dev_type1;
	int ret;

	/* Read ADC value according to external cable or button */
	ret = regmap_read(info->regmap, SM5502_REG_ADC, &adc);
	if (ret) {
		dev_err(info->dev, "failed to read ADC register\n");
		return ret;
	}

	/*
	 * If ADC is SM5502_MUIC_ADC_GROUND(0x0), external cable hasn't
	 * connected with to MUIC device.
	 */
	cable_type &= SM5502_REG_ADC_MASK;
	if (cable_type == SM5502_MUIC_ADC_GROUND)
		return SM5502_MUIC_ADC_GROUND;

	switch (cable_type) {
	case SM5502_MUIC_ADC_GROUND:
	case SM5502_MUIC_ADC_SEND_END_BUTTON:
	case SM5502_MUIC_ADC_REMOTE_S1_BUTTON:
	case SM5502_MUIC_ADC_REMOTE_S2_BUTTON:
	case SM5502_MUIC_ADC_REMOTE_S3_BUTTON:
	case SM5502_MUIC_ADC_REMOTE_S4_BUTTON:
	case SM5502_MUIC_ADC_REMOTE_S5_BUTTON:
	case SM5502_MUIC_ADC_REMOTE_S6_BUTTON:
	case SM5502_MUIC_ADC_REMOTE_S7_BUTTON:
	case SM5502_MUIC_ADC_REMOTE_S8_BUTTON:
	case SM5502_MUIC_ADC_REMOTE_S9_BUTTON:
	case SM5502_MUIC_ADC_REMOTE_S10_BUTTON:
	case SM5502_MUIC_ADC_REMOTE_S11_BUTTON:
	case SM5502_MUIC_ADC_REMOTE_S12_BUTTON:
	case SM5502_MUIC_ADC_RESERVED_ACC_1:
	case SM5502_MUIC_ADC_RESERVED_ACC_2:
	case SM5502_MUIC_ADC_RESERVED_ACC_3:
	case SM5502_MUIC_ADC_RESERVED_ACC_4:
	case SM5502_MUIC_ADC_RESERVED_ACC_5:
	case SM5502_MUIC_ADC_AUDIO_TYPE2:
	case SM5502_MUIC_ADC_PHONE_POWERED_DEV:
	case SM5502_MUIC_ADC_TTY_CONVERTER:
	case SM5502_MUIC_ADC_UART_CABLE:
	case SM5502_MUIC_ADC_TYPE1_CHARGER:
	case SM5502_MUIC_ADC_FACTORY_MODE_BOOT_OFF_USB:
	case SM5502_MUIC_ADC_FACTORY_MODE_BOOT_ON_USB:
	case SM5502_MUIC_ADC_AUDIO_VIDEO_CABLE:
	case SM5502_MUIC_ADC_TYPE2_CHARGER:
	case SM5502_MUIC_ADC_FACTORY_MODE_BOOT_OFF_UART:
	case SM5502_MUIC_ADC_FACTORY_MODE_BOOT_ON_UART:
		break;
	case SM5502_MUIC_ADC_AUDIO_TYPE1:
		/*
		 * Check whether cable type is
		 * SM5502_MUIC_ADC_AUDIO_TYPE1_FULL_REMOTE
		 * or SM5502_MUIC_ADC_AUDIO_TYPE1_SEND_END
		 * by using Button event.
		 */
		break;
	case SM5502_MUIC_ADC_OPEN:
		ret = regmap_read(info->regmap, SM5502_REG_DEV_TYPE1,
				  &dev_type1);
		if (ret) {
			dev_err(info->dev, "failed to read DEV_TYPE1 reg\n");
			return ret;
		}

		switch (dev_type1) {
		case SM5502_REG_DEV_TYPE1_USB_SDP_MASK:
			cable_type = SM5502_MUIC_ADC_OPEN_USB;
			break;
		case SM5502_REG_DEV_TYPE1_DEDICATED_CHG_MASK:
			cable_type = SM5502_MUIC_ADC_OPEN_TA;
			break;
		case SM5502_REG_DEV_TYPE1_USB_OTG_MASK:
			cable_type = SM5502_MUIC_ADC_OPEN_USB_OTG;
			break;
		default:
			dev_dbg(info->dev,
				"cannot identify the cable type: adc(0x%x) "
				"dev_type1(0x%x)\n", adc, dev_type1);
			return -EINVAL;
		};
		break;
	default:
		dev_err(info->dev,
			"failed to identify the cable type: adc(0x%x)\n", adc);
		return -EINVAL;
	};

	return cable_type;
}

static int sm5502_muic_cable_handler(struct sm5502_muic_info *info,
				     bool attached)
{
	static unsigned int prev_cable_type = SM5502_MUIC_ADC_GROUND;
	const char **cable_names = info->edev->supported_cable;
	unsigned int cable_type = SM5502_MUIC_ADC_GROUND;
	unsigned int idx = 0;

	if (!cable_names)
		return 0;

	/* Get the type of attached or detached cable */
	if (attached)
		cable_type = sm5502_muic_get_cable_type(info);
	else if (!attached)
		cable_type = prev_cable_type;
	prev_cable_type = cable_type;

	switch (cable_type) {
	case SM5502_MUIC_ADC_OPEN_USB:
		idx = EXTCON_CABLE_USB;
		break;
	case SM5502_MUIC_ADC_OPEN_TA:
		idx = EXTCON_CABLE_TA;
		break;
	case SM5502_MUIC_ADC_OPEN_USB_OTG:
		idx = EXTCON_CABLE_USB_HOST;
		break;
	case SM5502_MUIC_ADC_GROUND:
		break;
	default:
		dev_dbg(info->dev,
			"cannot handle this cable_type (0x%x)\n", cable_type);
		return 0;
	};

	extcon_set_cable_state(info->edev, cable_names[idx], attached);

	return 0;
}

static void sm5502_muic_irq_work(struct work_struct *work)
{
	struct sm5502_muic_info *info = container_of(work,
			struct sm5502_muic_info, irq_work);
	int ret = 0;

	if (!info->edev)
		return;

	mutex_lock(&info->mutex);

	/* Detect attached or detached cables */
	if (info->irq_attach) {
		ret = sm5502_muic_cable_handler(info, true);
		info->irq_attach = false;
	}
	if (info->irq_detach) {
		ret = sm5502_muic_cable_handler(info, false);
		info->irq_detach = false;
	}

	if (ret < 0)
		dev_err(info->dev, "failed to handle MUIC interrupt\n");

	mutex_unlock(&info->mutex);

	return;
}

/*
 * Sets irq_attach or irq_detach in sm5502_muic_info and returns 0.
 * Returns -ESRCH if irq_type does not match registered IRQ for this dev type.
 */
static int sm5502_parse_irq(struct sm5502_muic_info *info, int irq_type)
{
	switch (irq_type) {
	case SM5502_IRQ_INT1_ATTACH:
		info->irq_attach = true;
		break;
	case SM5502_IRQ_INT1_DETACH:
		info->irq_detach = true;
		break;
	case SM5502_IRQ_INT1_KP:
	case SM5502_IRQ_INT1_LKP:
	case SM5502_IRQ_INT1_LKR:
	case SM5502_IRQ_INT1_OVP_EVENT:
	case SM5502_IRQ_INT1_OCP_EVENT:
	case SM5502_IRQ_INT1_OVP_OCP_DIS:
	case SM5502_IRQ_INT2_VBUS_DET:
	case SM5502_IRQ_INT2_REV_ACCE:
	case SM5502_IRQ_INT2_ADC_CHG:
	case SM5502_IRQ_INT2_STUCK_KEY:
	case SM5502_IRQ_INT2_STUCK_KEY_RCV:
	case SM5502_IRQ_INT2_MHL:
	default:
		break;
	}

	return 0;
}

static irqreturn_t sm5502_muic_irq_handler(int irq, void *data)
{
	struct sm5502_muic_info *info = data;
	int i, irq_type = -1, ret;

	for (i = 0; i < info->num_muic_irqs; i++)
		if (irq == info->muic_irqs[i].virq)
			irq_type = info->muic_irqs[i].irq;

	ret = sm5502_parse_irq(info, irq_type);
	if (ret < 0) {
		dev_warn(info->dev, "cannot handle is interrupt:%d\n",
				    irq_type);
		return IRQ_HANDLED;
	}
	schedule_work(&info->irq_work);

	return IRQ_HANDLED;
}

static void sm5502_muic_detect_cable_wq(struct work_struct *work)
{
	struct sm5502_muic_info *info = container_of(to_delayed_work(work),
				struct sm5502_muic_info, wq_detcable);
	int ret;

	/* Notify the state of connector cable or not  */
	ret = sm5502_muic_cable_handler(info, true);
	if (ret < 0)
		dev_warn(info->dev, "failed to detect cable state\n");
}

static void sm5502_init_dev_type(struct sm5502_muic_info *info)
{
	unsigned int reg_data, vendor_id, version_id;
	int i, ret;

	/* To test I2C, Print version_id and vendor_id of SM5502 */
	ret = regmap_read(info->regmap, SM5502_REG_DEVICE_ID, &reg_data);
	if (ret) {
		dev_err(info->dev,
			"failed to read DEVICE_ID register: %d\n", ret);
		return;
	}

	vendor_id = ((reg_data & SM5502_REG_DEVICE_ID_VENDOR_MASK) >>
				SM5502_REG_DEVICE_ID_VENDOR_SHIFT);
	version_id = ((reg_data & SM5502_REG_DEVICE_ID_VERSION_MASK) >>
				SM5502_REG_DEVICE_ID_VERSION_SHIFT);

	dev_info(info->dev, "Device type: version: 0x%x, vendor: 0x%x\n",
			    version_id, vendor_id);

	/* Initiazle the register of SM5502 device to bring-up */
	for (i = 0; i < info->num_reg_data; i++) {
		unsigned int val = 0;

		if (!info->reg_data[i].invert)
			val |= ~info->reg_data[i].val;
		else
			val = info->reg_data[i].val;
		regmap_write(info->regmap, info->reg_data[i].reg, val);
	}
}

static int sm5022_muic_i2c_probe(struct i2c_client *i2c,
				 const struct i2c_device_id *id)
{
	struct device_node *np = i2c->dev.of_node;
	struct sm5502_muic_info *info;
	int i, ret, irq_flags;

	if (!np)
		return -EINVAL;

	info = devm_kzalloc(&i2c->dev, sizeof(*info), GFP_KERNEL);
	if (!info)
		return -ENOMEM;
	i2c_set_clientdata(i2c, info);

	info->dev = &i2c->dev;
	info->i2c = i2c;
	info->irq = i2c->irq;
	info->muic_irqs = sm5502_muic_irqs;
	info->num_muic_irqs = ARRAY_SIZE(sm5502_muic_irqs);
	info->reg_data = sm5502_reg_data;
	info->num_reg_data = ARRAY_SIZE(sm5502_reg_data);

	mutex_init(&info->mutex);

	INIT_WORK(&info->irq_work, sm5502_muic_irq_work);

	info->regmap = devm_regmap_init_i2c(i2c, &sm5502_muic_regmap_config);
	if (IS_ERR(info->regmap)) {
		ret = PTR_ERR(info->regmap);
		dev_err(info->dev, "failed to allocate register map: %d\n",
				   ret);
		return ret;
	}

	/* Support irq domain for SM5502 MUIC device */
	irq_flags = IRQF_TRIGGER_FALLING | IRQF_ONESHOT | IRQF_SHARED;
	ret = regmap_add_irq_chip(info->regmap, info->irq, irq_flags, 0,
				  &sm5502_muic_irq_chip, &info->irq_data);
	if (ret != 0) {
		dev_err(info->dev, "failed to request IRQ %d: %d\n",
				    info->irq, ret);
		return ret;
	}

	for (i = 0; i < info->num_muic_irqs; i++) {
		struct muic_irq *muic_irq = &info->muic_irqs[i];
		unsigned int virq = 0;

		virq = regmap_irq_get_virq(info->irq_data, muic_irq->irq);
		if (virq <= 0)
			return -EINVAL;
		muic_irq->virq = virq;

		ret = devm_request_threaded_irq(info->dev, virq, NULL,
						sm5502_muic_irq_handler,
						IRQF_NO_SUSPEND,
						muic_irq->name, info);
		if (ret) {
			dev_err(info->dev, "failed: irq request (IRQ: %d,"
				" error :%d)\n", muic_irq->irq, ret);
			return ret;
		}
	}

	/* Allocate extcon device */
	info->edev = devm_extcon_dev_allocate(info->dev, sm5502_extcon_cable);
	if (IS_ERR(info->edev)) {
		dev_err(info->dev, "failed to allocate memory for extcon\n");
		return -ENOMEM;
	}
	info->edev->name = np->name;

	/* Register extcon device */
	ret = devm_extcon_dev_register(info->dev, info->edev);
	if (ret) {
		dev_err(info->dev, "failed to register extcon device\n");
		return ret;
	}

	/*
	 * Detect accessory after completing the initialization of platform
	 *
	 * - Use delayed workqueue to detect cable state and then
	 * notify cable state to notifiee/platform through uevent.
	 * After completing the booting of platform, the extcon provider
	 * driver should notify cable state to upper layer.
	 */
	INIT_DELAYED_WORK(&info->wq_detcable, sm5502_muic_detect_cable_wq);
	queue_delayed_work(system_power_efficient_wq, &info->wq_detcable,
			msecs_to_jiffies(DELAY_MS_DEFAULT));

	/* Initialize SM5502 device and print vendor id and version id */
	sm5502_init_dev_type(info);

	return 0;
}

static int sm5502_muic_i2c_remove(struct i2c_client *i2c)
{
	struct sm5502_muic_info *info = i2c_get_clientdata(i2c);

	regmap_del_irq_chip(info->irq, info->irq_data);

	return 0;
}

static struct of_device_id sm5502_dt_match[] = {
	{ .compatible = "siliconmitus,sm5502-muic" },
	{ },
};

#ifdef CONFIG_PM_SLEEP
static int sm5502_muic_suspend(struct device *dev)
{
	struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
	struct sm5502_muic_info *info = i2c_get_clientdata(i2c);

	enable_irq_wake(info->irq);

	return 0;
}

static int sm5502_muic_resume(struct device *dev)
{
	struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
	struct sm5502_muic_info *info = i2c_get_clientdata(i2c);

	disable_irq_wake(info->irq);

	return 0;
}
#endif

static SIMPLE_DEV_PM_OPS(sm5502_muic_pm_ops,
			 sm5502_muic_suspend, sm5502_muic_resume);

static const struct i2c_device_id sm5502_i2c_id[] = {
	{ "sm5502", TYPE_SM5502 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, sm5502_i2c_id);

static struct i2c_driver sm5502_muic_i2c_driver = {
	.driver		= {
		.name	= "sm5502",
		.owner	= THIS_MODULE,
		.pm	= &sm5502_muic_pm_ops,
		.of_match_table = sm5502_dt_match,
	},
	.probe	= sm5022_muic_i2c_probe,
	.remove	= sm5502_muic_i2c_remove,
	.id_table = sm5502_i2c_id,
};

static int __init sm5502_muic_i2c_init(void)
{
	return i2c_add_driver(&sm5502_muic_i2c_driver);
}
subsys_initcall(sm5502_muic_i2c_init);

MODULE_DESCRIPTION("Silicon Mitus SM5502 Extcon driver");
MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>");
MODULE_LICENSE("GPL");
Commit	Line	Data
914b881f CC	1	/*
	2	* extcon-sm5502.c - Silicon Mitus SM5502 extcon drvier to support USB switches
	3	*
	4	* Copyright (c) 2014 Samsung Electronics Co., Ltd
	5	* Author: Chanwoo Choi <cw00.choi@samsung.com>
	6	*
	7	* This program is free software; you can redistribute it and/or modify it
	8	* under the terms of the GNU General Public License as published by the
	9	* Free Software Foundation; either version 2 of the License, or (at your
	10	* option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*/
	17
	18	#include <linux/err.h>
	19	#include <linux/i2c.h>
	20	#include <linux/input.h>
	21	#include <linux/interrupt.h>
	22	#include <linux/irqdomain.h>
	23	#include <linux/kernel.h>
	24	#include <linux/module.h>
	25	#include <linux/platform_device.h>
	26	#include <linux/regmap.h>
	27	#include <linux/slab.h>
	28	#include <linux/extcon.h>
	29	#include <linux/extcon/sm5502.h>
	30
e1954452 CC	31	#define DELAY_MS_DEFAULT 17000 /* unit: millisecond */
e1954452 CC	32
914b881f CC	33	struct muic_irq {
	34	unsigned int irq;
	35	const char *name;
	36	unsigned int virq;
	37	};
	38
	39	struct reg_data {
	40	u8 reg;
	41	unsigned int val;
	42	bool invert;
	43	};
	44
	45	struct sm5502_muic_info {
	46	struct device *dev;
	47	struct extcon_dev *edev;
	48
	49	struct i2c_client *i2c;
	50	struct regmap *regmap;
	51
	52	struct regmap_irq_chip_data *irq_data;
	53	struct muic_irq *muic_irqs;
	54	unsigned int num_muic_irqs;
	55	int irq;
	56	bool irq_attach;
	57	bool irq_detach;
	58	struct work_struct irq_work;
	59
	60	struct reg_data *reg_data;
	61	unsigned int num_reg_data;
	62
	63	struct mutex mutex;
e1954452 CC	64
	65	/*
	66	* Use delayed workqueue to detect cable state and then
	67	* notify cable state to notifiee/platform through uevent.
	68	* After completing the booting of platform, the extcon provider
	69	* driver should notify cable state to upper layer.
	70	*/
	71	struct delayed_work wq_detcable;
914b881f CC	72	};
	73
	74	/* Default value of SM5502 register to bring up MUIC device. */
	75	static struct reg_data sm5502_reg_data[] = {
	76	{
	77	.reg = SM5502_REG_CONTROL,
	78	.val = SM5502_REG_CONTROL_MASK_INT_MASK,
	79	.invert = false,
	80	}, {
	81	.reg = SM5502_REG_INTMASK1,
	82	.val = SM5502_REG_INTM1_KP_MASK
	83	\| SM5502_REG_INTM1_LKP_MASK
	84	\| SM5502_REG_INTM1_LKR_MASK,
	85	.invert = true,
	86	}, {
	87	.reg = SM5502_REG_INTMASK2,
	88	.val = SM5502_REG_INTM2_VBUS_DET_MASK
	89	\| SM5502_REG_INTM2_REV_ACCE_MASK
	90	\| SM5502_REG_INTM2_ADC_CHG_MASK
	91	\| SM5502_REG_INTM2_STUCK_KEY_MASK
	92	\| SM5502_REG_INTM2_STUCK_KEY_RCV_MASK
	93	\| SM5502_REG_INTM2_MHL_MASK,
	94	.invert = true,
	95	},
	96	{ }
	97	};
	98
	99	/* List of detectable cables */
	100	enum {
	101	EXTCON_CABLE_USB = 0,
	102	EXTCON_CABLE_USB_HOST,
	103	EXTCON_CABLE_TA,
	104
	105	EXTCON_CABLE_END,
	106	};
	107
	108	static const char *sm5502_extcon_cable[] = {
	109	[EXTCON_CABLE_USB] = "USB",
	110	[EXTCON_CABLE_USB_HOST] = "USB-Host",
	111	[EXTCON_CABLE_TA] = "TA",
	112	NULL,
	113	};
	114
	115	/* Define supported accessory type */
	116	enum sm5502_muic_acc_type {
	117	SM5502_MUIC_ADC_GROUND = 0x0,
	118	SM5502_MUIC_ADC_SEND_END_BUTTON,
	119	SM5502_MUIC_ADC_REMOTE_S1_BUTTON,
	120	SM5502_MUIC_ADC_REMOTE_S2_BUTTON,
	121	SM5502_MUIC_ADC_REMOTE_S3_BUTTON,
	122	SM5502_MUIC_ADC_REMOTE_S4_BUTTON,
	123	SM5502_MUIC_ADC_REMOTE_S5_BUTTON,
	124	SM5502_MUIC_ADC_REMOTE_S6_BUTTON,
	125	SM5502_MUIC_ADC_REMOTE_S7_BUTTON,
	126	SM5502_MUIC_ADC_REMOTE_S8_BUTTON,
	127	SM5502_MUIC_ADC_REMOTE_S9_BUTTON,
	128	SM5502_MUIC_ADC_REMOTE_S10_BUTTON,
	129	SM5502_MUIC_ADC_REMOTE_S11_BUTTON,
	130	SM5502_MUIC_ADC_REMOTE_S12_BUTTON,
	131	SM5502_MUIC_ADC_RESERVED_ACC_1,
	132	SM5502_MUIC_ADC_RESERVED_ACC_2,
	133	SM5502_MUIC_ADC_RESERVED_ACC_3,
	134	SM5502_MUIC_ADC_RESERVED_ACC_4,
	135	SM5502_MUIC_ADC_RESERVED_ACC_5,
136	SM5502_MUIC_ADC_AUDIO_TYPE2,
137	SM5502_MUIC_ADC_PHONE_POWERED_DEV,
138	SM5502_MUIC_ADC_TTY_CONVERTER,
139	SM5502_MUIC_ADC_UART_CABLE,
140	SM5502_MUIC_ADC_TYPE1_CHARGER,
141	SM5502_MUIC_ADC_FACTORY_MODE_BOOT_OFF_USB,
142	SM5502_MUIC_ADC_FACTORY_MODE_BOOT_ON_USB,
143	SM5502_MUIC_ADC_AUDIO_VIDEO_CABLE,
144	SM5502_MUIC_ADC_TYPE2_CHARGER,
145	SM5502_MUIC_ADC_FACTORY_MODE_BOOT_OFF_UART,
146	SM5502_MUIC_ADC_FACTORY_MODE_BOOT_ON_UART,
147	SM5502_MUIC_ADC_AUDIO_TYPE1,
148	SM5502_MUIC_ADC_OPEN = 0x1f,
149
150	/* The below accessories have same ADC value (0x1f or 0x1e).
151	So, Device type1 is used to separate specific accessory. */
152	/* \|---------\|--ADC\| */
153	/* \| [7:5]\|[4:0]\| */
154	SM5502_MUIC_ADC_AUDIO_TYPE1_FULL_REMOTE = 0x3e, /* \| 001\|11110\| */
155	SM5502_MUIC_ADC_AUDIO_TYPE1_SEND_END = 0x5e, /* \| 010\|11110\| */
156	/* \|Dev Type1\|--ADC\| */
157	SM5502_MUIC_ADC_OPEN_USB = 0x5f, /* \| 010\|11111\| */
158	SM5502_MUIC_ADC_OPEN_TA = 0xdf, /* \| 110\|11111\| */
159	SM5502_MUIC_ADC_OPEN_USB_OTG = 0xff, /* \| 111\|11111\| */
160	};
161
162	/* List of supported interrupt for SM5502 */
163	static struct muic_irq sm5502_muic_irqs[] = {
164	{ SM5502_IRQ_INT1_ATTACH, "muic-attach" },
165	{ SM5502_IRQ_INT1_DETACH, "muic-detach" },
166	{ SM5502_IRQ_INT1_KP, "muic-kp" },
167	{ SM5502_IRQ_INT1_LKP, "muic-lkp" },
168	{ SM5502_IRQ_INT1_LKR, "muic-lkr" },
169	{ SM5502_IRQ_INT1_OVP_EVENT, "muic-ovp-event" },
170	{ SM5502_IRQ_INT1_OCP_EVENT, "muic-ocp-event" },
171	{ SM5502_IRQ_INT1_OVP_OCP_DIS, "muic-ovp-ocp-dis" },
172	{ SM5502_IRQ_INT2_VBUS_DET, "muic-vbus-det" },
173	{ SM5502_IRQ_INT2_REV_ACCE, "muic-rev-acce" },
174	{ SM5502_IRQ_INT2_ADC_CHG, "muic-adc-chg" },
175	{ SM5502_IRQ_INT2_STUCK_KEY, "muic-stuck-key" },
176	{ SM5502_IRQ_INT2_STUCK_KEY_RCV, "muic-stuck-key-rcv" },
177	{ SM5502_IRQ_INT2_MHL, "muic-mhl" },
178	};
179
180	/* Define interrupt list of SM5502 to register regmap_irq */
181	static const struct regmap_irq sm5502_irqs[] = {
182	/* INT1 interrupts */
183	{ .reg_offset = 0, .mask = SM5502_IRQ_INT1_ATTACH_MASK, },
184	{ .reg_offset = 0, .mask = SM5502_IRQ_INT1_DETACH_MASK, },
185	{ .reg_offset = 0, .mask = SM5502_IRQ_INT1_KP_MASK, },
186	{ .reg_offset = 0, .mask = SM5502_IRQ_INT1_LKP_MASK, },
187	{ .reg_offset = 0, .mask = SM5502_IRQ_INT1_LKR_MASK, },
188	{ .reg_offset = 0, .mask = SM5502_IRQ_INT1_OVP_EVENT_MASK, },
189	{ .reg_offset = 0, .mask = SM5502_IRQ_INT1_OCP_EVENT_MASK, },
190	{ .reg_offset = 0, .mask = SM5502_IRQ_INT1_OVP_OCP_DIS_MASK, },
191
192	/* INT2 interrupts */
193	{ .reg_offset = 1, .mask = SM5502_IRQ_INT2_VBUS_DET_MASK,},
194	{ .reg_offset = 1, .mask = SM5502_IRQ_INT2_REV_ACCE_MASK, },
195	{ .reg_offset = 1, .mask = SM5502_IRQ_INT2_ADC_CHG_MASK, },
196	{ .reg_offset = 1, .mask = SM5502_IRQ_INT2_STUCK_KEY_MASK, },
197	{ .reg_offset = 1, .mask = SM5502_IRQ_INT2_STUCK_KEY_RCV_MASK, },
198	{ .reg_offset = 1, .mask = SM5502_IRQ_INT2_MHL_MASK, },
199	};
200
201	static const struct regmap_irq_chip sm5502_muic_irq_chip = {
202	.name = "sm5502",
203	.status_base = SM5502_REG_INT1,
204	.mask_base = SM5502_REG_INTMASK1,
205	.mask_invert = false,
206	.num_regs = 2,
207	.irqs = sm5502_irqs,
208	.num_irqs = ARRAY_SIZE(sm5502_irqs),
209	};
210
211	/* Define regmap configuration of SM5502 for I2C communication */
212	static bool sm5502_muic_volatile_reg(struct device *dev, unsigned int reg)
213	{
214	switch (reg) {
215	case SM5502_REG_INTMASK1:
216	case SM5502_REG_INTMASK2:
217	return true;
218	default:
219	break;
220	}
221	return false;
222	}
223
224	static const struct regmap_config sm5502_muic_regmap_config = {
225	.reg_bits = 8,
226	.val_bits = 8,
227	.volatile_reg = sm5502_muic_volatile_reg,
228	.max_register = SM5502_REG_END,
229	};
230
231	/* Return cable type of attached or detached accessories */
232	static unsigned int sm5502_muic_get_cable_type(struct sm5502_muic_info *info)
233	{
234	unsigned int cable_type = -1, adc, dev_type1;
235	int ret;
236
237	/* Read ADC value according to external cable or button */
238	ret = regmap_read(info->regmap, SM5502_REG_ADC, &adc);
239	if (ret) {
240	dev_err(info->dev, "failed to read ADC register\n");
241	return ret;
242	}
243
244	/*
245	* If ADC is SM5502_MUIC_ADC_GROUND(0x0), external cable hasn't
246	* connected with to MUIC device.
247	*/
248	cable_type &= SM5502_REG_ADC_MASK;
249	if (cable_type == SM5502_MUIC_ADC_GROUND)
250	return SM5502_MUIC_ADC_GROUND;
251
252	switch (cable_type) {
253	case SM5502_MUIC_ADC_GROUND:
254	case SM5502_MUIC_ADC_SEND_END_BUTTON:
255	case SM5502_MUIC_ADC_REMOTE_S1_BUTTON:
256	case SM5502_MUIC_ADC_REMOTE_S2_BUTTON:
257	case SM5502_MUIC_ADC_REMOTE_S3_BUTTON:
258	case SM5502_MUIC_ADC_REMOTE_S4_BUTTON:
259	case SM5502_MUIC_ADC_REMOTE_S5_BUTTON:
260	case SM5502_MUIC_ADC_REMOTE_S6_BUTTON:
261	case SM5502_MUIC_ADC_REMOTE_S7_BUTTON:
262	case SM5502_MUIC_ADC_REMOTE_S8_BUTTON:
263	case SM5502_MUIC_ADC_REMOTE_S9_BUTTON:
264	case SM5502_MUIC_ADC_REMOTE_S10_BUTTON:
265	case SM5502_MUIC_ADC_REMOTE_S11_BUTTON:
266	case SM5502_MUIC_ADC_REMOTE_S12_BUTTON:
267	case SM5502_MUIC_ADC_RESERVED_ACC_1:
268	case SM5502_MUIC_ADC_RESERVED_ACC_2:
269	case SM5502_MUIC_ADC_RESERVED_ACC_3:
270	case SM5502_MUIC_ADC_RESERVED_ACC_4:
271	case SM5502_MUIC_ADC_RESERVED_ACC_5:
272	case SM5502_MUIC_ADC_AUDIO_TYPE2:
273	case SM5502_MUIC_ADC_PHONE_POWERED_DEV:
274	case SM5502_MUIC_ADC_TTY_CONVERTER:
275	case SM5502_MUIC_ADC_UART_CABLE:
276	case SM5502_MUIC_ADC_TYPE1_CHARGER:
277	case SM5502_MUIC_ADC_FACTORY_MODE_BOOT_OFF_USB:
278	case SM5502_MUIC_ADC_FACTORY_MODE_BOOT_ON_USB:
279	case SM5502_MUIC_ADC_AUDIO_VIDEO_CABLE:
280	case SM5502_MUIC_ADC_TYPE2_CHARGER:
281	case SM5502_MUIC_ADC_FACTORY_MODE_BOOT_OFF_UART:
282	case SM5502_MUIC_ADC_FACTORY_MODE_BOOT_ON_UART:
283	break;
284	case SM5502_MUIC_ADC_AUDIO_TYPE1:
285	/*
286	* Check whether cable type is
287	* SM5502_MUIC_ADC_AUDIO_TYPE1_FULL_REMOTE
288	* or SM5502_MUIC_ADC_AUDIO_TYPE1_SEND_END
289	* by using Button event.
290	*/
291	break;
292	case SM5502_MUIC_ADC_OPEN:
293	ret = regmap_read(info->regmap, SM5502_REG_DEV_TYPE1,
294	&dev_type1);
295	if (ret) {
296	dev_err(info->dev, "failed to read DEV_TYPE1 reg\n");
297	return ret;
298	}
299
300	switch (dev_type1) {
301	case SM5502_REG_DEV_TYPE1_USB_SDP_MASK:
302	cable_type = SM5502_MUIC_ADC_OPEN_USB;
303	break;
304	case SM5502_REG_DEV_TYPE1_DEDICATED_CHG_MASK:
305	cable_type = SM5502_MUIC_ADC_OPEN_TA;
306	break;
307	case SM5502_REG_DEV_TYPE1_USB_OTG_MASK:
308	cable_type = SM5502_MUIC_ADC_OPEN_USB_OTG;
309	break;
310	default:
311	dev_dbg(info->dev,
312	"cannot identify the cable type: adc(0x%x) "
313	"dev_type1(0x%x)\n", adc, dev_type1);
314	return -EINVAL;
315	};
316	break;
317	default:
318	dev_err(info->dev,
319	"failed to identify the cable type: adc(0x%x)\n", adc);
320	return -EINVAL;
321	};
322
323	return cable_type;
324	}
325
326	static int sm5502_muic_cable_handler(struct sm5502_muic_info *info,
327	bool attached)
328	{
329	static unsigned int prev_cable_type = SM5502_MUIC_ADC_GROUND;
330	const char **cable_names = info->edev->supported_cable;
331	unsigned int cable_type = SM5502_MUIC_ADC_GROUND;
332	unsigned int idx = 0;
333
334	if (!cable_names)
335	return 0;
336
337	/* Get the type of attached or detached cable */
338	if (attached)
339	cable_type = sm5502_muic_get_cable_type(info);
340	else if (!attached)
341	cable_type = prev_cable_type;
342	prev_cable_type = cable_type;
343
344	switch (cable_type) {
345	case SM5502_MUIC_ADC_OPEN_USB:
346	idx = EXTCON_CABLE_USB;
347	break;
348	case SM5502_MUIC_ADC_OPEN_TA:
349	idx = EXTCON_CABLE_TA;
350	break;
351	case SM5502_MUIC_ADC_OPEN_USB_OTG:
352	idx = EXTCON_CABLE_USB_HOST;
353	break;
e1954452 CC	354	case SM5502_MUIC_ADC_GROUND:
e1954452 CC	355	break;
914b881f CC	356	default:
	357	dev_dbg(info->dev,
	358	"cannot handle this cable_type (0x%x)\n", cable_type);
	359	return 0;
	360	};
	361
	362	extcon_set_cable_state(info->edev, cable_names[idx], attached);
	363
	364	return 0;
	365	}
	366
	367	static void sm5502_muic_irq_work(struct work_struct *work)
	368	{
	369	struct sm5502_muic_info *info = container_of(work,
	370	struct sm5502_muic_info, irq_work);
	371	int ret = 0;
	372
	373	if (!info->edev)
	374	return;
	375
	376	mutex_lock(&info->mutex);
	377
	378	/* Detect attached or detached cables */
	379	if (info->irq_attach) {
	380	ret = sm5502_muic_cable_handler(info, true);
	381	info->irq_attach = false;
	382	}
	383	if (info->irq_detach) {
	384	ret = sm5502_muic_cable_handler(info, false);
	385	info->irq_detach = false;
	386	}
	387
	388	if (ret < 0)
	389	dev_err(info->dev, "failed to handle MUIC interrupt\n");
	390
	391	mutex_unlock(&info->mutex);
	392
	393	return;
	394	}
	395
	396	/*
	397	* Sets irq_attach or irq_detach in sm5502_muic_info and returns 0.
	398	* Returns -ESRCH if irq_type does not match registered IRQ for this dev type.
	399	*/
	400	static int sm5502_parse_irq(struct sm5502_muic_info *info, int irq_type)
	401	{
	402	switch (irq_type) {
	403	case SM5502_IRQ_INT1_ATTACH:
	404	info->irq_attach = true;
	405	break;
	406	case SM5502_IRQ_INT1_DETACH:
	407	info->irq_detach = true;
	408	break;
	409	case SM5502_IRQ_INT1_KP:
	410	case SM5502_IRQ_INT1_LKP:
	411	case SM5502_IRQ_INT1_LKR:
	412	case SM5502_IRQ_INT1_OVP_EVENT:
	413	case SM5502_IRQ_INT1_OCP_EVENT:
	414	case SM5502_IRQ_INT1_OVP_OCP_DIS:
	415	case SM5502_IRQ_INT2_VBUS_DET:
	416	case SM5502_IRQ_INT2_REV_ACCE:
	417	case SM5502_IRQ_INT2_ADC_CHG:
	418	case SM5502_IRQ_INT2_STUCK_KEY:
	419	case SM5502_IRQ_INT2_STUCK_KEY_RCV:
420	case SM5502_IRQ_INT2_MHL:
421	default:
422	break;
423	}
424
425	return 0;
426	}
427
428	static irqreturn_t sm5502_muic_irq_handler(int irq, void *data)
429	{
430	struct sm5502_muic_info *info = data;
431	int i, irq_type = -1, ret;
432
433	for (i = 0; i < info->num_muic_irqs; i++)
434	if (irq == info->muic_irqs[i].virq)
435	irq_type = info->muic_irqs[i].irq;
436
437	ret = sm5502_parse_irq(info, irq_type);
438	if (ret < 0) {
439	dev_warn(info->dev, "cannot handle is interrupt:%d\n",
440	irq_type);
441	return IRQ_HANDLED;
442	}
443	schedule_work(&info->irq_work);
444
445	return IRQ_HANDLED;
446	}
447
e1954452 CC	448	static void sm5502_muic_detect_cable_wq(struct work_struct *work)
	449	{
	450	struct sm5502_muic_info *info = container_of(to_delayed_work(work),
	451	struct sm5502_muic_info, wq_detcable);
	452	int ret;
	453
	454	/* Notify the state of connector cable or not */
	455	ret = sm5502_muic_cable_handler(info, true);
	456	if (ret < 0)
	457	dev_warn(info->dev, "failed to detect cable state\n");
	458	}
	459
914b881f CC	460	static void sm5502_init_dev_type(struct sm5502_muic_info *info)
	461	{
	462	unsigned int reg_data, vendor_id, version_id;
	463	int i, ret;
	464
	465	/* To test I2C, Print version_id and vendor_id of SM5502 */
	466	ret = regmap_read(info->regmap, SM5502_REG_DEVICE_ID, &reg_data);
	467	if (ret) {
	468	dev_err(info->dev,
	469	"failed to read DEVICE_ID register: %d\n", ret);
	470	return;
	471	}
	472
	473	vendor_id = ((reg_data & SM5502_REG_DEVICE_ID_VENDOR_MASK) >>
	474	SM5502_REG_DEVICE_ID_VENDOR_SHIFT);
	475	version_id = ((reg_data & SM5502_REG_DEVICE_ID_VERSION_MASK) >>
	476	SM5502_REG_DEVICE_ID_VERSION_SHIFT);
	477
	478	dev_info(info->dev, "Device type: version: 0x%x, vendor: 0x%x\n",
	479	version_id, vendor_id);
	480
	481	/* Initiazle the register of SM5502 device to bring-up */
	482	for (i = 0; i < info->num_reg_data; i++) {
	483	unsigned int val = 0;
	484
	485	if (!info->reg_data[i].invert)
	486	val \|= ~info->reg_data[i].val;
	487	else
	488	val = info->reg_data[i].val;
	489	regmap_write(info->regmap, info->reg_data[i].reg, val);
	490	}
	491	}
	492
	493	static int sm5022_muic_i2c_probe(struct i2c_client *i2c,
	494	const struct i2c_device_id *id)
	495	{
	496	struct device_node *np = i2c->dev.of_node;
	497	struct sm5502_muic_info *info;
	498	int i, ret, irq_flags;
	499
	500	if (!np)
	501	return -EINVAL;
	502
	503	info = devm_kzalloc(&i2c->dev, sizeof(*info), GFP_KERNEL);
	504	if (!info)
	505	return -ENOMEM;
	506	i2c_set_clientdata(i2c, info);
	507
	508	info->dev = &i2c->dev;
	509	info->i2c = i2c;
	510	info->irq = i2c->irq;
	511	info->muic_irqs = sm5502_muic_irqs;
	512	info->num_muic_irqs = ARRAY_SIZE(sm5502_muic_irqs);
	513	info->reg_data = sm5502_reg_data;
	514	info->num_reg_data = ARRAY_SIZE(sm5502_reg_data);
	515
	516	mutex_init(&info->mutex);
	517
	518	INIT_WORK(&info->irq_work, sm5502_muic_irq_work);
	519
	520	info->regmap = devm_regmap_init_i2c(i2c, &sm5502_muic_regmap_config);
	521	if (IS_ERR(info->regmap)) {
	522	ret = PTR_ERR(info->regmap);
	523	dev_err(info->dev, "failed to allocate register map: %d\n",
524	ret);
525	return ret;
526	}
527
528	/* Support irq domain for SM5502 MUIC device */
529	irq_flags = IRQF_TRIGGER_FALLING \| IRQF_ONESHOT \| IRQF_SHARED;
530	ret = regmap_add_irq_chip(info->regmap, info->irq, irq_flags, 0,
531	&sm5502_muic_irq_chip, &info->irq_data);
532	if (ret != 0) {
533	dev_err(info->dev, "failed to request IRQ %d: %d\n",
534	info->irq, ret);
535	return ret;
536	}
537
538	for (i = 0; i < info->num_muic_irqs; i++) {
539	struct muic_irq *muic_irq = &info->muic_irqs[i];
540	unsigned int virq = 0;
541
542	virq = regmap_irq_get_virq(info->irq_data, muic_irq->irq);
543	if (virq <= 0)
544	return -EINVAL;
545	muic_irq->virq = virq;
546
547	ret = devm_request_threaded_irq(info->dev, virq, NULL,
548	sm5502_muic_irq_handler,
549	IRQF_NO_SUSPEND,
550	muic_irq->name, info);
551	if (ret) {
552	dev_err(info->dev, "failed: irq request (IRQ: %d,"
553	" error :%d)\n", muic_irq->irq, ret);
554	return ret;
555	}
556	}
557
558	/* Allocate extcon device */
559	info->edev = devm_extcon_dev_allocate(info->dev, sm5502_extcon_cable);
560	if (IS_ERR(info->edev)) {
561	dev_err(info->dev, "failed to allocate memory for extcon\n");
562	return -ENOMEM;
563	}
564	info->edev->name = np->name;
565
566	/* Register extcon device */
567	ret = devm_extcon_dev_register(info->dev, info->edev);
568	if (ret) {
569	dev_err(info->dev, "failed to register extcon device\n");
570	return ret;
571	}
572
e1954452 CC	573	/*
	574	* Detect accessory after completing the initialization of platform
	575	*
	576	* - Use delayed workqueue to detect cable state and then
	577	* notify cable state to notifiee/platform through uevent.
	578	* After completing the booting of platform, the extcon provider
	579	* driver should notify cable state to upper layer.
	580	*/
	581	INIT_DELAYED_WORK(&info->wq_detcable, sm5502_muic_detect_cable_wq);
	582	queue_delayed_work(system_power_efficient_wq, &info->wq_detcable,
	583	msecs_to_jiffies(DELAY_MS_DEFAULT));
	584
914b881f CC	585	/* Initialize SM5502 device and print vendor id and version id */
	586	sm5502_init_dev_type(info);
	587
	588	return 0;
	589	}
	590
	591	static int sm5502_muic_i2c_remove(struct i2c_client *i2c)
	592	{
	593	struct sm5502_muic_info *info = i2c_get_clientdata(i2c);
	594
	595	regmap_del_irq_chip(info->irq, info->irq_data);
	596
	597	return 0;
	598	}
	599
	600	static struct of_device_id sm5502_dt_match[] = {
	601	{ .compatible = "siliconmitus,sm5502-muic" },
	602	{ },
	603	};
	604
	605	#ifdef CONFIG_PM_SLEEP
	606	static int sm5502_muic_suspend(struct device *dev)
	607	{
	608	struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
	609	struct sm5502_muic_info *info = i2c_get_clientdata(i2c);
	610
	611	enable_irq_wake(info->irq);
	612
	613	return 0;
	614	}
	615
	616	static int sm5502_muic_resume(struct device *dev)
	617	{
	618	struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
	619	struct sm5502_muic_info *info = i2c_get_clientdata(i2c);
	620
	621	disable_irq_wake(info->irq);
	622
	623	return 0;
	624	}
	625	#endif
	626
	627	static SIMPLE_DEV_PM_OPS(sm5502_muic_pm_ops,
	628	sm5502_muic_suspend, sm5502_muic_resume);
	629
	630	static const struct i2c_device_id sm5502_i2c_id[] = {
	631	{ "sm5502", TYPE_SM5502 },
	632	{ }
	633	};
	634	MODULE_DEVICE_TABLE(i2c, sm5502_i2c_id);
	635
	636	static struct i2c_driver sm5502_muic_i2c_driver = {
	637	.driver = {
	638	.name = "sm5502",
	639	.owner = THIS_MODULE,
	640	.pm = &sm5502_muic_pm_ops,
	641	.of_match_table = sm5502_dt_match,
	642	},
	643	.probe = sm5022_muic_i2c_probe,
	644	.remove = sm5502_muic_i2c_remove,
	645	.id_table = sm5502_i2c_id,
	646	};
	647
	648	static int __init sm5502_muic_i2c_init(void)
649	{
650	return i2c_add_driver(&sm5502_muic_i2c_driver);
651	}
652	subsys_initcall(sm5502_muic_i2c_init);
653
654	MODULE_DESCRIPTION("Silicon Mitus SM5502 Extcon driver");
655	MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>");
656	MODULE_LICENSE("GPL");