/*
 * SAMSUNG NFC Controller
 *
 * Copyright (C) 2013 Samsung Electronics Co.Ltd
 * Author: Woonki Lee <woonki84.lee@samsung.com>
 *         Heejae Kim <heejae12.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
 *
 */
#ifdef CONFIG_SEC_NFC_IF_I2C_GPIO
#define CONFIG_SEC_NFC_IF_I2C
#endif

#include <linux/wait.h>
#include <linux/delay.h>

#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/io.h>
#include <linux/platform_device.h>
#include <linux/mutex.h>
#include <linux/module.h>
#include <linux/miscdevice.h>
#include <linux/gpio.h>
#include <linux/slab.h>
#include <linux/fs.h>
#include <asm/uaccess.h>
#include <linux/clk-provider.h>
#ifdef CONFIG_SEC_NFC_GPIO_CLK
#include <linux/interrupt.h>
#endif
#ifdef CONFIG_SEC_NFC_WAKE_LOCK
#include <linux/wakelock.h>
#endif
#include <linux/of_gpio.h>
#include <linux/clk.h>

#ifndef CONFIG_SEC_NFC_IF_I2C
struct sec_nfc_i2c_info {};
#define sec_nfc_read			NULL
#define sec_nfc_write			NULL
#define sec_nfc_poll			NULL
#define sec_nfc_i2c_irq_clear(x)

#define SEC_NFC_GET_INFO(dev) platform_get_drvdata(to_platform_device(dev))

#else /* CONFIG_SEC_NFC_IF_I2C */
#include <linux/interrupt.h>
#include <linux/poll.h>
#include <linux/sched.h>
#include <linux/i2c.h>
#include "sec_nfc.h"

#define SEC_NFC_GET_INFO(dev) i2c_get_clientdata(to_i2c_client(dev))
enum sec_nfc_irq {
	SEC_NFC_SKIP = -1,
	SEC_NFC_NONE,
	SEC_NFC_INT,
	SEC_NFC_READ_TIMES,
};

struct sec_nfc_i2c_info {
	struct i2c_client *i2c_dev;
	struct mutex read_mutex;
	enum sec_nfc_irq read_irq;
	wait_queue_head_t read_wait;
	size_t buflen;
	u8 *buf;
};
#endif

struct sec_nfc_info {
	struct miscdevice miscdev;
	struct mutex mutex;
	enum sec_nfc_mode mode;
	struct device *dev;
	struct sec_nfc_platform_data *pdata;
	struct sec_nfc_i2c_info i2c_info;
#ifdef CONFIG_SEC_NFC_WAKE_LOCK
	struct wake_lock nfc_wake_lock;
#endif
#ifdef CONFIG_SEC_NFC_GPIO_CLK
	bool clk_ctl;
	bool clk_state;
#endif
#ifdef CONFIG_SEC_NFC_DEDICATED_CLK
	void __iomem *clkctrl;
#endif
};

#ifdef CONFIG_SEC_ESE_COLDRESET
struct mutex coldreset_mutex;
struct mutex sleep_wake_mutex;
bool sleep_wakeup_state[2];
u8 disable_combo_reset_cmd[4] = {0x2F, 0x30, 0x01, 0x00};
bool is_shutdown = false;
enum sec_nfc_mode cur_mode;
#endif

#ifdef CONFIG_SEC_NFC_IF_I2C
static irqreturn_t sec_nfc_irq_thread_fn(int irq, void *dev_id)
{
	struct sec_nfc_info *info = dev_id;
	struct sec_nfc_platform_data *pdata = info->pdata;

	dev_dbg(info->dev, "[NFC] Read Interrupt is occurred!\n");

	if (gpio_get_value(pdata->irq) == 0) {
		dev_err(info->dev, "[NFC] Warning,irq-gpio state is low!\n");
		return IRQ_HANDLED;
	}

	mutex_lock(&info->i2c_info.read_mutex);
	/* Skip interrupt during power switching
	 * It is released after first write */
	if (info->i2c_info.read_irq == SEC_NFC_SKIP) {
		dev_dbg(info->dev, "%s: Now power swiching. Skip this IRQ\n", __func__);
		mutex_unlock(&info->i2c_info.read_mutex);
		return IRQ_HANDLED;
	}

	info->i2c_info.read_irq += SEC_NFC_READ_TIMES;
	mutex_unlock(&info->i2c_info.read_mutex);

	wake_up_interruptible(&info->i2c_info.read_wait);
#ifdef CONFIG_SEC_NFC_WAKE_LOCK
	wake_lock_timeout(&info->nfc_wake_lock, 2 * HZ);
#endif

	return IRQ_HANDLED;
}

static ssize_t sec_nfc_read(struct file *file, char __user *buf,
							size_t count, loff_t *ppos)
{
	struct sec_nfc_info *info = container_of(file->private_data,
												struct sec_nfc_info, miscdev);
	enum sec_nfc_irq irq;
	int ret = 0;

	dev_dbg(info->dev, "%s: info: %p, count: %zu\n", __func__,
			info, count);

	mutex_lock(&info->mutex);
	if (info->mode == SEC_NFC_MODE_OFF) {
		dev_err(info->dev, "sec_nfc is not enabled\n");
		ret = -ENODEV;
		goto out;
	}

	mutex_lock(&info->i2c_info.read_mutex);
	if (count == 0) {
		if (info->i2c_info.read_irq >= SEC_NFC_INT)
			info->i2c_info.read_irq--;
		mutex_unlock(&info->i2c_info.read_mutex);
		goto out;
	}

	irq = info->i2c_info.read_irq;
	mutex_unlock(&info->i2c_info.read_mutex);
	if (irq == SEC_NFC_NONE) {
		if (file->f_flags & O_NONBLOCK) {
			dev_err(info->dev, "it is nonblock\n");
			ret = -EAGAIN;
			goto out;
		}
	}

	/* i2c recv */
	if (count > info->i2c_info.buflen)
		count = info->i2c_info.buflen;

	if (count > SEC_NFC_MSG_MAX_SIZE) {
		dev_err(info->dev, "user required wrong size :%d\n", (u32)count);
		ret = -EINVAL;
		goto out;
	}

	mutex_lock(&info->i2c_info.read_mutex);
	memset(info->i2c_info.buf, 0, count);
	ret = i2c_master_recv(info->i2c_info.i2c_dev, info->i2c_info.buf, (u32)count);
	dev_dbg(info->dev, "recv size : %d\n", ret);

	if (ret == -EREMOTEIO) {
		ret = -ERESTART;
		goto read_error;
	} else if (ret != count) {
		dev_err(info->dev, "read failed: return: %d count: %d\n",
				ret, (u32)count);
		/* ret = -EREMOTEIO; */
		goto read_error;
	}

	if (info->i2c_info.read_irq >= SEC_NFC_INT)
		info->i2c_info.read_irq--;

	if (info->i2c_info.read_irq == SEC_NFC_READ_TIMES)
		wake_up_interruptible(&info->i2c_info.read_wait);

	mutex_unlock(&info->i2c_info.read_mutex);

	if (copy_to_user(buf, info->i2c_info.buf, ret)) {
		dev_err(info->dev, "copy failed to user\n");
		ret = -EFAULT;
	}

	goto out;

read_error:
	info->i2c_info.read_irq = SEC_NFC_NONE;
	mutex_unlock(&info->i2c_info.read_mutex);
out:
	mutex_unlock(&info->mutex);

	return ret;
}

static ssize_t sec_nfc_write(struct file *file, const char __user *buf,
								size_t count, loff_t *ppos)
{
	struct sec_nfc_info *info = container_of(file->private_data,
												struct sec_nfc_info, miscdev);
	int ret = 0;

	dev_dbg(info->dev, "%s: info: %p, count %d\n", __func__,
			info, (u32)count);

	mutex_lock(&info->mutex);

	if (info->mode == SEC_NFC_MODE_OFF) {
		dev_err(info->dev, "sec_nfc is not enabled\n");
		ret = -ENODEV;
		goto out;
	}

	if (count > info->i2c_info.buflen)
		count = info->i2c_info.buflen;

	if (count > SEC_NFC_MSG_MAX_SIZE) {
		dev_err(info->dev, "user required wrong size :%d\n", (u32)count);
		ret = -EINVAL;
		goto out;
	}

	if (copy_from_user(info->i2c_info.buf, buf, count)) {
		dev_err(info->dev, "copy failed from user\n");
		ret = -EFAULT;
		goto out;
	}

	/* Skip interrupt during power switching
	 * It is released after first write
	 */
	mutex_lock(&info->i2c_info.read_mutex);
	ret = i2c_master_send(info->i2c_info.i2c_dev, info->i2c_info.buf, count);
	if (info->i2c_info.read_irq == SEC_NFC_SKIP)
		info->i2c_info.read_irq = SEC_NFC_NONE;
	mutex_unlock(&info->i2c_info.read_mutex);

	if (ret == -EREMOTEIO) {
		dev_err(info->dev, "send failed: return: %d count: %d\n",
		ret, (u32)count);
		ret = -ERESTART;
		goto out;
	}

	if (ret != count) {
		dev_err(info->dev, "send failed: return: %d count: %d\n",
		ret, (u32)count);
		ret = -EREMOTEIO;
	}

out:
	mutex_unlock(&info->mutex);

	return ret;
}

static unsigned int sec_nfc_poll(struct file *file, poll_table *wait)
{
	struct sec_nfc_info *info = container_of(file->private_data,
												struct sec_nfc_info, miscdev);
	enum sec_nfc_irq irq;

	int ret = 0;

	dev_dbg(info->dev, "%s: info: %p\n", __func__, info);

	mutex_lock(&info->mutex);

	if (info->mode == SEC_NFC_MODE_OFF) {
		dev_err(info->dev, "sec_nfc is not enabled\n");
		ret = -ENODEV;
		goto out;
	}

	poll_wait(file, &info->i2c_info.read_wait, wait);

	mutex_lock(&info->i2c_info.read_mutex);
	irq = info->i2c_info.read_irq;
	if (irq == SEC_NFC_READ_TIMES)
		ret = (POLLIN | POLLRDNORM);
	mutex_unlock(&info->i2c_info.read_mutex);

out:
	mutex_unlock(&info->mutex);

	return ret;
}

void sec_nfc_i2c_irq_clear(struct sec_nfc_info *info)
{
	/* clear interrupt. Interrupt will be occurred at power off */
	mutex_lock(&info->i2c_info.read_mutex);
	info->i2c_info.read_irq = SEC_NFC_NONE;
	mutex_unlock(&info->i2c_info.read_mutex);
}

int sec_nfc_i2c_probe(struct i2c_client *client)
{
	struct device *dev = &client->dev;
	struct sec_nfc_info *info = dev_get_drvdata(dev);
	struct sec_nfc_platform_data *pdata = info->pdata;
	int ret;

	pr_info("%s: start: %p\n", __func__, info);

	info->i2c_info.buflen = SEC_NFC_MAX_BUFFER_SIZE;
	info->i2c_info.buf = kzalloc(SEC_NFC_MAX_BUFFER_SIZE, GFP_KERNEL);
	if (!info->i2c_info.buf) {
		dev_err(dev, "failed to allocate memory for sec_nfc_info->buf\n");
		return -ENOMEM;
	}
	info->i2c_info.i2c_dev = client;
	info->i2c_info.read_irq = SEC_NFC_NONE;
	mutex_init(&info->i2c_info.read_mutex);
	init_waitqueue_head(&info->i2c_info.read_wait);
	i2c_set_clientdata(client, info);

	info->dev = dev;

	ret = gpio_request(pdata->irq, "nfc_int");
	if (ret) {
		pr_err("GPIO request is failed to register IRQ\n");
		goto err_irq_req;
	}
	client->irq = gpio_to_irq(pdata->irq);
	pr_info("%s: push interrupt no = %d\n", __func__, client->irq);

	ret = request_threaded_irq(client->irq, NULL, sec_nfc_irq_thread_fn,
								IRQF_TRIGGER_RISING | IRQF_ONESHOT, SEC_NFC_DRIVER_NAME,
								info);
	if (ret < 0) {
		pr_err("failed to register IRQ handler\n");
		kfree(info->i2c_info.buf);
		return ret;
	}

	pr_info("%s success\n", __func__);
	return 0;

err_irq_req:
	return ret;
}

void sec_nfc_i2c_remove(struct device *dev)
{
	struct sec_nfc_info *info = dev_get_drvdata(dev);
	struct i2c_client *client = info->i2c_info.i2c_dev;
	struct sec_nfc_platform_data *pdata = info->pdata;
	free_irq(client->irq, info);
	gpio_free(pdata->irq);
}
#endif /* CONFIG_SEC_NFC_IF_I2C */

#ifdef CONFIG_SEC_NFC_GPIO_CLK
static irqreturn_t sec_nfc_clk_irq_thread(int irq, void *dev_id)
{
	struct sec_nfc_info *info = dev_id;
	struct sec_nfc_platform_data *pdata = info->pdata;
	bool value;

	dev_dbg(info->dev, "[NFC]Clock Interrupt is occurred!\n");
	value = gpio_get_value(pdata->clk_req) > 0 ? true : false;

	if (value == info->clk_state)
		return IRQ_HANDLED;

	if (value)
		clk_prepare_enable(pdata->clk);
	else
		clk_disable_unprepare(pdata->clk);

	info->clk_state = value;

	return IRQ_HANDLED;
}

void sec_nfc_clk_ctl_enable(struct sec_nfc_info *info)
{
	struct sec_nfc_platform_data *pdata = info->pdata;
	unsigned int irq;
	int ret;

	irq = gpio_to_irq(pdata->clk_req);

	if (info->clk_ctl)
		return;

	info->clk_state = false;
	ret = request_threaded_irq(irq, NULL, sec_nfc_clk_irq_thread,
								IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
								SEC_NFC_DRIVER_NAME, info);
	if (ret < 0)
		dev_err(info->dev, "failed to register CLK REQ IRQ handler\n");

	info->clk_ctl = true;
}

void sec_nfc_clk_ctl_disable(struct sec_nfc_info *info)
{
	struct sec_nfc_platform_data *pdata = info->pdata;
	unsigned int irq;

	if (pdata->clk_req)
		irq = gpio_to_irq(pdata->clk_req);
	else
		return;

	if (!info->clk_ctl)
		return;

	free_irq(irq, info);
	if (info->clk_state)
		clk_disable_unprepare(pdata->clk);
	info->clk_state = false;
	info->clk_ctl = false;
}
#else
#define sec_nfc_clk_ctl_enable(x)
#define sec_nfc_clk_ctl_disable(x)
#endif /* CONFIG_SEC_NFC_GPIO_CLK */

static void sec_nfc_set_mode(struct sec_nfc_info *info,
								enum sec_nfc_mode mode)
{
	struct sec_nfc_platform_data *pdata = info->pdata;
#ifdef CONFIG_SEC_ESE_COLDRESET
	int alreadFirmHigh = 0;
	int ret ;
	enum sec_nfc_mode oldmode = info->mode;
#endif
#ifdef CONFIG_SEC_NFC_DEDICATED_CLK
	unsigned int val = readl(info->clkctrl);
#endif

	/* intfo lock is aleady gotten before calling this function */
	if (info->mode == mode) {
		pr_err("Power mode is already %d", mode);
		return;
	}
	info->mode = mode;

#ifdef CONFIG_SEC_NFC_IF_I2C
	/* Skip interrupt during power switching
	 * It is released after first write */
	mutex_lock(&info->i2c_info.read_mutex);
#ifdef CONFIG_SEC_ESE_COLDRESET
	cur_mode = mode;
	memset(sleep_wakeup_state, false, sizeof(sleep_wakeup_state));
	if (oldmode == SEC_NFC_MODE_OFF) {
		if (gpio_get_value(pdata->firm) == 1) {
			alreadFirmHigh = 1;
			pr_err("Firm is already high; do not anything");
		} else { /*Firm pin is low*/
			gpio_set_value(pdata->firm, SEC_NFC_FW_ON);
			msleep(SEC_NFC_VEN_WAIT_TIME);
		}

		if (gpio_get_value(pdata->ven) == SEC_NFC_PW_ON) {
			ret = i2c_master_send(info->i2c_info.i2c_dev, disable_combo_reset_cmd,
									sizeof(disable_combo_reset_cmd)/sizeof(u8));
			pr_err("disable combo_reset_command ret: %d", ret);
		} else {
			pr_err("skip disable combo_reset_command");
		}

		if (alreadFirmHigh == 1) {
			pr_err("Firm is already high; do not anything2");
		} else { /*Firm pin is low*/
			mdelay(3); /*wait for FW*/
			gpio_set_value(pdata->firm, SEC_NFC_FW_OFF);
		}
	}
#endif
	info->i2c_info.read_irq = SEC_NFC_SKIP;
	mutex_unlock(&info->i2c_info.read_mutex);
#endif

#ifdef CONFIG_SEC_ESE_COLDRESET
	mdelay(1); 
	pr_err("FIRMWARE_GUARD_TIME(+1ms) in PW_OFF(total:4ms)\n");
#endif

	gpio_set_value(pdata->ven, SEC_NFC_PW_OFF);
	if (pdata->firm)
		gpio_set_value(pdata->firm, SEC_NFC_FW_OFF);

	if (mode == SEC_NFC_MODE_BOOTLOADER)
		if (pdata->firm)
			gpio_set_value(pdata->firm, SEC_NFC_FW_ON);

	if (mode != SEC_NFC_MODE_OFF) {
		msleep(SEC_NFC_VEN_WAIT_TIME);
		gpio_set_value(pdata->ven, SEC_NFC_PW_ON);
		sec_nfc_clk_ctl_enable(info);
#ifdef CONFIG_SEC_NFC_DEDICATED_CLK
		val |= 0xC0000000;
		writel(val, info->clkctrl);
#endif
#ifdef CONFIG_SEC_NFC_IF_I2C
		enable_irq_wake(info->i2c_info.i2c_dev->irq);
#endif
		msleep(SEC_NFC_VEN_WAIT_TIME/2);
	} else {
#ifdef CONFIG_SEC_ESE_COLDRESET
		int PW_OFF_DURATION = 20;
		struct timespec t0, t1;
		getnstimeofday(&t0);
		mdelay(PW_OFF_DURATION);

		if (is_shutdown == false)
			gpio_set_value(pdata->ven, SEC_NFC_PW_ON);

		getnstimeofday(&t1);
		pr_err("DeepStby: PW_OFF duration (%d)ms, real PW_OFF duration is (%ld-%ld)ms\n",
					PW_OFF_DURATION ,t0.tv_nsec*1000, t1.tv_nsec*1000);
		pr_err("DeepStby: enter DeepStby(PW_ON)\n");
#endif
		sec_nfc_clk_ctl_disable(info);
#ifdef CONFIG_SEC_NFC_DEDICATED_CLK
		val &= ~0xC0000000;
		writel(val, info->clkctrl);
#endif
#ifdef CONFIG_SEC_NFC_IF_I2C
		disable_irq_wake(info->i2c_info.i2c_dev->irq);
#endif
	}

#ifdef CONFIG_SEC_NFC_WAKE_LOCK
	if (wake_lock_active(&info->nfc_wake_lock))
		wake_unlock(&info->nfc_wake_lock);
#endif

	pr_info("%s NFC mode is : %d\n", __func__, mode);
}

#ifdef CONFIG_SEC_ESE_COLDRESET
struct cold_reset_gpio {
	int firm_gpio;
	int coldreset_gpio;
};

struct cold_reset_gpio cold_reset_gpio_data;

void init_coldreset_mutex(void)
{
	mutex_init(&coldreset_mutex);
}

void init_sleep_wake_mutex(void)
{
	mutex_init(&sleep_wake_mutex);
}

void check_and_sleep_nfc(unsigned int gpio, int value) {
	if (sleep_wakeup_state[IDX_SLEEP_WAKEUP_NFC] == true ||
			sleep_wakeup_state[IDX_SLEEP_WAKEUP_ESE] == true) {
		pr_info("%s keep wake up state\n", __func__);
		return;
	}
	gpio_set_value(gpio, value);
}

int trig_cold_reset_id(int id)
{
	int wakeup_delay = 20;
	int duration = 18;
	struct timespec t0, t1, t2;
	int isFirmHigh = 0;

	if (id == ESE_ID)
		mutex_lock(&coldreset_mutex);

	getnstimeofday(&t0);
	if (gpio_get_value(cold_reset_gpio_data.firm_gpio) == 1) {
		isFirmHigh = 1;
	} else {
		gpio_set_value(cold_reset_gpio_data.firm_gpio, SEC_NFC_FW_ON);
		mdelay(wakeup_delay);
	}

	getnstimeofday(&t1);
	gpio_set_value(cold_reset_gpio_data.coldreset_gpio, SEC_NFC_COLDRESET_ON);
	mdelay(duration);
	gpio_set_value(cold_reset_gpio_data.coldreset_gpio, SEC_NFC_COLDRESET_OFF);
	getnstimeofday(&t2);

	if (isFirmHigh == 1)
		pr_err("COLDRESET: FW_PIN already high, do not FW_OFF\n");
	else
		gpio_set_value(cold_reset_gpio_data.firm_gpio, SEC_NFC_FW_OFF);

	pr_err("COLDRESET: FW_ON time (%ld-%ld)\n", t0.tv_nsec*1000, t1.tv_nsec*1000); 
	pr_err("COLDRESET: GPIO3 ON time (%ld-%ld)\n", t1.tv_nsec*1000, t2.tv_nsec*1000);

	if (id == ESE_ID)
		mutex_unlock(&coldreset_mutex);

	pr_err("COLDRESET: exit");
	return 0;
}

extern int trig_cold_reset(void) // Called from eSE driver
{
	pr_info("%s trig_cold_reset\n", __func__);
	return trig_cold_reset_id(ESE_ID);
}
EXPORT_SYMBOL(trig_cold_reset);

extern int trig_nfc_wakeup(void)
{
	pr_info("%s trig_nfc_wakeup\n", __func__);

	if (cur_mode == SEC_NFC_MODE_OFF || cur_mode == SEC_NFC_MODE_BOOTLOADER) {
		pr_err("nfc mode not support to wake up");
		return -EPERM;;
	}
	mutex_lock(&sleep_wake_mutex);
	gpio_set_value(cold_reset_gpio_data.firm_gpio, SEC_NFC_WAKE_UP);
	sleep_wakeup_state[IDX_SLEEP_WAKEUP_ESE] = true;
	mutex_unlock(&sleep_wake_mutex);
	return 0;
}
EXPORT_SYMBOL(trig_nfc_wakeup);

extern int trig_nfc_sleep(void)
{
	pr_info("%s trig_nfc_sleep\n", __func__);
	if (cur_mode == SEC_NFC_MODE_OFF || cur_mode == SEC_NFC_MODE_BOOTLOADER) {
		pr_err("nfc mode not support to sleep");
		return -EPERM;;
	}
	mutex_lock(&sleep_wake_mutex);
	sleep_wakeup_state[IDX_SLEEP_WAKEUP_ESE] = false;
	check_and_sleep_nfc(cold_reset_gpio_data.firm_gpio, SEC_NFC_WAKE_SLEEP);
	mutex_unlock(&sleep_wake_mutex);
	return 0;
}
EXPORT_SYMBOL(trig_nfc_sleep);
#endif

static long sec_nfc_ioctl(struct file *file, unsigned int cmd,
							unsigned long arg)
{
	struct sec_nfc_info *info = container_of(file->private_data,
												struct sec_nfc_info, miscdev);
	struct sec_nfc_platform_data *pdata = info->pdata;
	unsigned int new = (unsigned int)arg;
	int ret = 0;

	dev_dbg(info->dev, "%s: info: %p, cmd: 0x%x\n",
			__func__, info, cmd);

	mutex_lock(&info->mutex);
#ifdef CONFIG_SEC_ESE_COLDRESET
	mutex_lock(&coldreset_mutex);
#endif

	switch (cmd) {
	case SEC_NFC_SET_MODE:
		if (info->mode == new)
			break;

		if (new >= SEC_NFC_MODE_COUNT) {
			dev_err(info->dev, "wrong mode (%d)\n", new);
			ret = -EFAULT;
			break;
		}
		sec_nfc_set_mode(info, new);
		break;

#if defined(CONFIG_SEC_NFC_PRODUCT_N3)
	case SEC_NFC_SLEEP:
	case SEC_NFC_WAKEUP:
		break;

#elif defined(CONFIG_SEC_NFC_PRODUCT_N5) || defined(CONFIG_SEC_NFC_PRODUCT_N7)
	case SEC_NFC_SLEEP:
		if (info->mode != SEC_NFC_MODE_BOOTLOADER) {
#ifdef CONFIG_SEC_NFC_WAKE_LOCK
			if (wake_lock_active(&info->nfc_wake_lock))
				wake_unlock(&info->nfc_wake_lock);
#endif
#ifdef CONFIG_SEC_ESE_COLDRESET
			mutex_lock(&sleep_wake_mutex);
			sleep_wakeup_state[IDX_SLEEP_WAKEUP_NFC] = false;
			check_and_sleep_nfc(pdata->wake, SEC_NFC_WAKE_SLEEP);
			mutex_unlock(&sleep_wake_mutex);
#else
			gpio_set_value(pdata->wake, SEC_NFC_WAKE_SLEEP);
#endif
		}
		break;

	case SEC_NFC_WAKEUP:
		if (info->mode != SEC_NFC_MODE_BOOTLOADER) {
			gpio_set_value(pdata->wake, SEC_NFC_WAKE_UP);
#ifdef CONFIG_SEC_ESE_COLDRESET
			sleep_wakeup_state[IDX_SLEEP_WAKEUP_NFC] = true;
#endif
#ifdef CONFIG_SEC_NFC_WAKE_LOCK
			if (!wake_lock_active(&info->nfc_wake_lock))
				wake_lock(&info->nfc_wake_lock);
#endif
		}
		break;
#endif
#ifdef CONFIG_SEC_ESE_COLDRESET
	case SEC_NFC_COLD_RESET:
		trig_cold_reset_id(DEVICEHOST_ID);
		break;
	case SEC_NFC_SHUTDOWN:
		is_shutdown = true;
		break;
#endif
	default:
		dev_err(info->dev, "Unknown ioctl 0x%x\n", cmd);
		ret = -ENOIOCTLCMD;
		break;
	}

#ifdef CONFIG_SEC_ESE_COLDRESET
	mutex_unlock(&coldreset_mutex);
#endif
	mutex_unlock(&info->mutex);

	return ret;
}

static int sec_nfc_open(struct inode *inode, struct file *file)
{
	struct sec_nfc_info *info = container_of(file->private_data,
												struct sec_nfc_info, miscdev);
	struct sec_nfc_platform_data *pdata = info->pdata;
	int ret = 0;

	pr_info("%s info : %p\n", __func__, info);
	if (!pdata) {
		pr_err("%s pdata is Null!\n", __func__);
		return -ENOMEM;
	}

#ifdef CONFIG_SEC_NFC_LDO_EN
	ret = gpio_request(pdata->pvdd_en, "ldo_en");
	if (ret < 0) {
		pr_err("failed to request about pvdd_en pin\n");
		goto err_dev_reg;
	}
	gpio_direction_output(pdata->pvdd_en, NFC_I2C_LDO_ON);
	pr_info("pvdd en: %d\n", gpio_get_value(pdata->pvdd_en));
#endif
#ifdef CONFIG_SEC_NFC_PMIC_LDO
	pdata->pvdd_regulator = regulator_get(NULL, pdata->pvdd_regulator_name);
	if (IS_ERR(pdata->pvdd_regulator))
		pr_err("%s: Failed to get %s pmic regulator.\n", __func__, pdata->pvdd_regulator);
	ret = regulator_enable(pdata->pvdd_regulator);
#endif

	mutex_lock(&info->mutex);
	if (info->mode != SEC_NFC_MODE_OFF) {
		dev_err(info->dev, "sec_nfc is busy\n");
		ret = -EBUSY;
		goto out;
	}

	sec_nfc_set_mode(info, SEC_NFC_MODE_OFF);

out:
	mutex_unlock(&info->mutex);
	return ret;
}

static int sec_nfc_close(struct inode *inode, struct file *file)
{
	struct sec_nfc_info *info = container_of(file->private_data,
												struct sec_nfc_info, miscdev);

	pr_info("%s: info : %p\n", __func__, info);

	mutex_lock(&info->mutex);
	sec_nfc_set_mode(info, SEC_NFC_MODE_OFF);
	mutex_unlock(&info->mutex);

	return 0;
}

static const struct file_operations sec_nfc_fops = {
	.owner		= THIS_MODULE,
	.read		= sec_nfc_read,
	.write		= sec_nfc_write,
	.poll		= sec_nfc_poll,
	.open		= sec_nfc_open,
	.release	= sec_nfc_close,
	.unlocked_ioctl = sec_nfc_ioctl,
};

#ifdef CONFIG_PM
static int sec_nfc_suspend(struct device *dev)
{
	struct sec_nfc_info *info = SEC_NFC_GET_INFO(dev);
	int ret = 0;

	mutex_lock(&info->mutex);

	if (info->mode == SEC_NFC_MODE_BOOTLOADER)
		ret = -EPERM;

	mutex_unlock(&info->mutex);

	return ret;
}

static int sec_nfc_resume(struct device *dev)
{
	return 0;
}

static SIMPLE_DEV_PM_OPS(sec_nfc_pm_ops, sec_nfc_suspend, sec_nfc_resume);
#endif

#ifdef CONFIG_OF
/*device tree parsing*/
static int sec_nfc_parse_dt(struct device *dev,
							struct sec_nfc_platform_data *pdata)
{
	struct device_node *np = dev->of_node;

	pdata->ven = of_get_named_gpio(np, "sec-nfc,ven-gpio", 0);
	pdata->firm = of_get_named_gpio(np, "sec-nfc,firm-gpio", 0);
	pdata->wake = pdata->firm;
#ifdef CONFIG_SEC_NFC_IF_I2C
	pdata->irq = of_get_named_gpio(np, "sec-nfc,irq-gpio", 0);
#endif

#ifdef CONFIG_SEC_ESE_COLDRESET
	pdata->coldreset = of_get_named_gpio(np, "sec-nfc,coldreset-gpio",0);
	cold_reset_gpio_data.firm_gpio = pdata->firm;
	cold_reset_gpio_data.coldreset_gpio = pdata->coldreset;
#endif

#ifdef CONFIG_SEC_NFC_LDO_EN
	pdata->pvdd_en = of_get_named_gpio(np, "sec-nfc,ldo_en",0);
#endif
#ifdef CONFIG_SEC_NFC_PMIC_LDO
	if (of_property_read_string(np, "sec-nfc,pmic-ldo", &pdata->pvdd_regulator_name))
		pr_err("%s: Failed to get %s regulator.\n", __func__, pdata->pvdd_regulator_name);
#endif

#ifdef CONFIG_SEC_NFC_DEDICATED_CLK
	if(of_property_read_u32(np, "clkctrl-reg", (u32 *)&pdata->clkctrl_addr))
		return -EINVAL;
#endif
#ifdef CONFIG_SEC_NFC_GPIO_CLK
	pdata->clk_req = of_get_named_gpio(np, "sec-nfc,clk_req-gpio", 0);
	pdata->clk = clk_get(dev, "OSC_NFC");
#endif

	pr_info("%s: irq : %d, ven : %d, firm : %d\n",
			__func__, pdata->irq, pdata->ven, pdata->firm);
	return 0;
}
#else /* CONFIG_OF */
static int sec_nfc_parse_dt(struct device *dev,
							struct sec_nfc_platform_data *pdata)
{
	return -ENODEV;
}
#endif

static int __sec_nfc_probe(struct device *dev)
{
	struct sec_nfc_info *info;
	struct sec_nfc_platform_data *pdata = NULL;
	int ret = 0;

	pr_info("%s : start\n", __func__);
	if (dev->of_node) {
		pdata = devm_kzalloc(dev, sizeof(struct sec_nfc_platform_data), GFP_KERNEL);
		if (!pdata)
			return -ENOMEM;

		ret = sec_nfc_parse_dt(dev, pdata);
		if (ret)
			return ret;
	} else {
		pdata = dev->platform_data;
	}

	if (!pdata) {
		dev_err(dev, "No platform data\n");
		ret = -ENOMEM;
		goto err_pdata;
	}

	info = kzalloc(sizeof(struct sec_nfc_info), GFP_KERNEL);
	if (!info) {
		ret = -ENOMEM;
		goto err_info_alloc;
	}
	info->dev = dev;
	info->pdata = pdata;
	info->mode = SEC_NFC_MODE_OFF;

	mutex_init(&info->mutex);
	dev_set_drvdata(dev, info);

	info->miscdev.minor = MISC_DYNAMIC_MINOR;
	info->miscdev.name = SEC_NFC_DRIVER_NAME;
	info->miscdev.fops = &sec_nfc_fops;
	info->miscdev.parent = dev;
	ret = misc_register(&info->miscdev);
	if (ret < 0) {
		dev_err(dev, "failed to register Device\n");
		goto err_dev_reg;
	}

#ifdef CONFIG_SEC_NFC_DEDICATED_CLK
	if (pdata->clkctrl_addr != 0) {
		//info->clkctrl = ioremap_nocache(pdata->clkctrl_addr, 0x80);
		info->clkctrl = ioremap_wc(pdata->clkctrl_addr, 0x80);
		if (!info->clkctrl) {
			dev_err(dev, "cannot remap nfc clock register\n");
			ret = -ENXIO;
			goto err_iomap;
		}
	}
#endif
	ret = gpio_request(pdata->ven, "nfc_ven");
	if (ret) {
		dev_err(dev, "failed to get gpio ven\n");
		goto err_gpio_ven;
	}
	gpio_direction_output(pdata->ven, SEC_NFC_FW_OFF);

	if (pdata->firm) {
		ret = gpio_request(pdata->firm, "nfc_firm");
		if (ret) {
			dev_err(dev, "failed to get gpio firm\n");
			goto err_gpio_firm;
		}
		gpio_direction_output(pdata->firm, SEC_NFC_FW_OFF);
	}
#ifdef CONFIG_SEC_ESE_COLDRESET
	init_coldreset_mutex();
	init_sleep_wake_mutex();
	memset(sleep_wakeup_state, false, sizeof(sleep_wakeup_state));
	ret = gpio_request(pdata->coldreset, "nfc_coldreset");
	if (ret) {
		dev_err(dev, "failed to get gpio coldreset(NFC-GPIO3)\n");
		goto err_gpio_coldreset;
	}
	gpio_direction_output(pdata->coldreset, SEC_NFC_COLDRESET_OFF);
#endif
#ifdef CONFIG_SEC_NFC_WAKE_LOCK
	wake_lock_init(&info->nfc_wake_lock, WAKE_LOCK_SUSPEND, "nfc_wake_lock");
#endif

	dev_info(dev, "%s: success info: %p, pdata %p\n", __func__, info, pdata);

	return 0;

#ifdef CONFIG_SEC_ESE_COLDRESET
err_gpio_coldreset:
	gpio_free(pdata->coldreset);
#endif
err_gpio_firm:
	gpio_free(pdata->ven);
err_gpio_ven:
#ifdef CONFIG_SEC_NFC_DEDICATED_CLK
	iounmap(info->clkctrl);
err_iomap:
#endif
err_dev_reg:
	mutex_destroy(&info->mutex);
	kfree(info);
err_info_alloc:
	devm_kfree(dev, pdata);
err_pdata:
	return ret;
}

static int __sec_nfc_remove(struct device *dev)
{
	struct sec_nfc_info *info = dev_get_drvdata(dev);
	struct i2c_client *client = info->i2c_info.i2c_dev;
	struct sec_nfc_platform_data *pdata = info->pdata;

	dev_dbg(info->dev, "%s\n", __func__);

#ifdef CONFIG_SEC_NFC_GPIO_CLK
	if (pdata->clk)
		clk_unprepare(pdata->clk);
#endif

	misc_deregister(&info->miscdev);
	sec_nfc_set_mode(info, SEC_NFC_MODE_OFF);
	free_irq(client->irq, info);
	gpio_free(pdata->irq);
	gpio_set_value(pdata->firm, 0);
	gpio_free(pdata->ven);
	if (pdata->firm)
		gpio_free(pdata->firm);

#ifdef CONFIG_SEC_NFC_WAKE_LOCK
	wake_lock_destroy(&info->nfc_wake_lock);
#endif

	kfree(info);

	return 0;
}

#ifdef CONFIG_SEC_NFC_IF_I2C
static struct i2c_device_id sec_nfc_id_table[] = {
	{ SEC_NFC_DRIVER_NAME, 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, sec_nfc_id_table);
typedef struct i2c_driver sec_nfc_driver_type;
#define SEC_NFC_INIT(driver)	i2c_add_driver(driver)
#define SEC_NFC_EXIT(driver)	i2c_del_driver(driver)

static int sec_nfc_probe(struct i2c_client *client,
							const struct i2c_device_id *id)
{
	int ret = 0;

	ret = __sec_nfc_probe(&client->dev);
	if (ret)
		return ret;

	if (sec_nfc_i2c_probe(client))
		__sec_nfc_remove(&client->dev);

	return ret;
}

static int sec_nfc_remove(struct i2c_client *client)
{
	sec_nfc_i2c_remove(&client->dev);
	return __sec_nfc_remove(&client->dev);
}
#else /* CONFIG_SEC_NFC_IF_I2C */
MODULE_DEVICE_TABLE(platform, sec_nfc_id_table);
typedef struct platform_driver sec_nfc_driver_type;
#define SEC_NFC_INIT(driver)	platform_driver_register(driver);
#define SEC_NFC_EXIT(driver)	platform_driver_unregister(driver);

static int sec_nfc_probe(struct platform_device *pdev)
{
	return __sec_nfc_probe(&pdev->dev);
}

static int sec_nfc_remove(struct platform_device *pdev)
{
	return __sec_nfc_remove(&pdev->dev);
}

static struct platform_device_id sec_nfc_id_table[] = {
	{ SEC_NFC_DRIVER_NAME, 0 },
	{ }
};
#endif /* CONFIG_SEC_NFC_IF_I2C */

#ifdef CONFIG_OF
static const struct of_device_id nfc_match_table[] = {
	{ .compatible = SEC_NFC_DRIVER_NAME,},
	{},
};
#else /* CONFIG_OF */
#define nfc_match_table NULL
#endif

static struct i2c_driver sec_nfc_driver = {
	.probe = sec_nfc_probe,
	.id_table = sec_nfc_id_table,
	.remove = sec_nfc_remove,
	.driver = {
		.name = SEC_NFC_DRIVER_NAME,
#ifdef CONFIG_PM
		.pm = &sec_nfc_pm_ops,
#endif
		.of_match_table = nfc_match_table,
	},
};

static int __init sec_nfc_init(void)
{
	return SEC_NFC_INIT(&sec_nfc_driver);
}

static void __exit sec_nfc_exit(void)
{
	SEC_NFC_EXIT(&sec_nfc_driver);
}

module_init(sec_nfc_init);
module_exit(sec_nfc_exit);

MODULE_SOFTDEP("pre: i2c-exynos5");
MODULE_DESCRIPTION("Samsung sec_nfc driver");
MODULE_LICENSE("GPL");