drivers/nfc/nfc-nci.c

/* Copyright (c) 2013, The Linux Foundation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only version 2 as published by the Free Software Foundation.
 *
 * 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/kernel.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/irq.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/gpio.h>
#include <linux/spinlock.h>
#include <linux/poll.h>
#include <linux/of_gpio.h>
#include <linux/clk.h>
#include <linux/of_device.h>
#include <linux/regulator/consumer.h>
#include "nfc-nci.h"
#include <mach/gpiomux.h>

struct qca199x_platform_data {
	unsigned int irq_gpio;
	unsigned int	irq_gpio_clk_req;
	unsigned int	clk_req_irq_num;
	unsigned int dis_gpio;
	unsigned int clkreq_gpio;
	unsigned int reg;
	const char *clk_src_name;
	unsigned int clk_src_gpio;
};

static struct of_device_id msm_match_table[] = {
	{.compatible = "qcom,nfc-nci"},
	{}
};

MODULE_DEVICE_TABLE(of, msm_match_table);

#define MAX_BUFFER_SIZE			(780)
#define PACKET_MAX_LENGTH			(258)
/* Read data */
#define PACKET_HEADER_SIZE_NCI	(4)
#define PACKET_TYPE_NCI			(16)
#define MAX_PACKET_SIZE			(PACKET_HEADER_SIZE_NCI + 255)
#define MAX_QCA_REG				(116)
/* will timeout in approx. 100ms as 10us steps */
#define NFC_RF_CLK_FREQ			(19200000)
#define NTF_TIMEOUT				(10000)
#define	CORE_RESET_RSP_GID		(0x60)
#define	CORE_RESET_OID			(0x00)
#define CORE_RST_NTF_LENGTH			(0x02)

static void clk_req_update(struct work_struct *work);

struct qca199x_dev {
	wait_queue_head_t read_wq;
	struct	mutex		read_mutex;
	struct	i2c_client	*client;
	struct	miscdevice	qca199x_device;
	/* NFC_IRQ new NCI data available */
	unsigned int		irq_gpio;
	/* CLK_REQ IRQ to signal the state has changed */
	unsigned int		irq_gpio_clk_req;
	/* Actual IRQ no. assigned to CLK_REQ */
	unsigned int		clk_req_irq_num;
	unsigned int		dis_gpio;
	unsigned int		clkreq_gpio;
	/* NFC_IRQ state */
	bool			irq_enabled;
	bool			sent_first_nci_write;
	spinlock_t		irq_enabled_lock;
	unsigned int		count_irq;
	/* CLK_REQ IRQ state */
	bool			irq_enabled_clk_req;
	spinlock_t		irq_enabled_lock_clk_req;
	unsigned int		count_irq_clk_req;
	enum	nfcc_state	state;
	/* CLK control */
	unsigned int		clk_src_gpio;
	const	char		*clk_src_name;
	struct	clk		*s_clk;
	bool			clk_run;
	struct work_struct	msm_clock_controll_work;
	struct workqueue_struct *my_wq;
};

static int nfc_i2c_write(struct i2c_client *client, u8 *buf, int len);
static int nfcc_hw_check(struct i2c_client *client, unsigned short curr_addr);
static int nfcc_initialise(struct i2c_client *client, unsigned short curr_addr);
static int qca199x_clock_select(struct qca199x_dev *qca199x_dev);
static int qca199x_clock_deselect(struct qca199x_dev *qca199x_dev);



/*
 * To allow filtering of nfc logging from user. This is set via
 * IOCTL NFC_KERNEL_LOGGING_MODE.
 */
static int logging_level;
/*
 * FTM-RAW-I2C RD/WR MODE
 */
static struct devicemode	device_mode;
static int					ftm_raw_write_mode;
static int					ftm_werr_code;


static void qca199x_init_stat(struct qca199x_dev *qca199x_dev)
{
	qca199x_dev->count_irq = 0;
}

static void qca199x_disable_irq(struct qca199x_dev *qca199x_dev)
{
	unsigned long flags;

	spin_lock_irqsave(&qca199x_dev->irq_enabled_lock, flags);
	if (qca199x_dev->irq_enabled) {
		disable_irq_nosync(qca199x_dev->client->irq);
		qca199x_dev->irq_enabled = false;
	}
	spin_unlock_irqrestore(&qca199x_dev->irq_enabled_lock, flags);
}

static void qca199x_enable_irq(struct qca199x_dev *qca199x_dev)
{
	unsigned long flags;

	spin_lock_irqsave(&qca199x_dev->irq_enabled_lock, flags);
	if (!qca199x_dev->irq_enabled) {
		qca199x_dev->irq_enabled = true;
		enable_irq(qca199x_dev->client->irq);
	}
	spin_unlock_irqrestore(&qca199x_dev->irq_enabled_lock, flags);
}

static irqreturn_t qca199x_dev_irq_handler(int irq, void *dev_id)
{
	struct qca199x_dev *qca199x_dev = dev_id;
	unsigned long flags;

	spin_lock_irqsave(&qca199x_dev->irq_enabled_lock, flags);
	qca199x_dev->count_irq++;
	spin_unlock_irqrestore(&qca199x_dev->irq_enabled_lock, flags);
	wake_up(&qca199x_dev->read_wq);

	return IRQ_HANDLED;
}

static unsigned int nfc_poll(struct file *filp, poll_table *wait)
{
	struct qca199x_dev *qca199x_dev = filp->private_data;
	unsigned int mask = 0;
	unsigned long flags;

	poll_wait(filp, &qca199x_dev->read_wq, wait);

	spin_lock_irqsave(&qca199x_dev->irq_enabled_lock, flags);
	if (qca199x_dev->count_irq > 0) {
		qca199x_dev->count_irq--;
		mask |= POLLIN | POLLRDNORM;
	}
	spin_unlock_irqrestore(&qca199x_dev->irq_enabled_lock, flags);

	return mask;
}

/* Handlers for CLK_REQ */
static void qca199x_disable_irq_clk_req(struct qca199x_dev *qca199x_dev)
{
	unsigned long flags;

	spin_lock_irqsave(&qca199x_dev->irq_enabled_lock_clk_req, flags);
	if (qca199x_dev->irq_enabled_clk_req) {
		disable_irq_nosync(qca199x_dev->clk_req_irq_num);
		qca199x_dev->irq_enabled_clk_req = false;
	}
	spin_unlock_irqrestore(&qca199x_dev->irq_enabled_lock_clk_req, flags);
}


static void qca199x_enable_irq_clk_req(struct qca199x_dev *qca199x_dev)
{
	unsigned long flags;

	spin_lock_irqsave(&qca199x_dev->irq_enabled_lock_clk_req, flags);
	if (!qca199x_dev->irq_enabled_clk_req) {
		qca199x_dev->irq_enabled_clk_req = true;
		enable_irq(qca199x_dev->clk_req_irq_num);
	}
	spin_unlock_irqrestore(&qca199x_dev->irq_enabled_lock_clk_req, flags);
}


static irqreturn_t qca199x_dev_irq_handler_clk_req(int irq, void *dev_id)
{
	struct qca199x_dev *qca199x_dev = dev_id;
	unsigned long flags;

	spin_lock_irqsave(&qca199x_dev->irq_enabled_lock_clk_req, flags);
	qca199x_dev->count_irq_clk_req++;
	spin_unlock_irqrestore(&qca199x_dev->irq_enabled_lock_clk_req, flags);

	queue_work(qca199x_dev->my_wq, &qca199x_dev->msm_clock_controll_work);

	return IRQ_HANDLED;
}


static struct gpiomux_setting nfc_clk_on = {
	.func = GPIOMUX_FUNC_2,
	.drv  = GPIOMUX_DRV_2MA,
	.pull = GPIOMUX_PULL_NONE,
};
static struct gpiomux_setting nfc_clk_on_suspend = {
	.func = GPIOMUX_FUNC_2,
	.drv  = GPIOMUX_DRV_2MA,
	.pull = GPIOMUX_PULL_DOWN,
};
static struct gpiomux_setting nfc_clk_off = {
	.func = GPIOMUX_FUNC_GPIO,
	.drv  = GPIOMUX_DRV_2MA,
	.pull = GPIOMUX_PULL_DOWN,
};

static void clk_req_update(struct work_struct *work)
{
	struct	i2c_client *client;
	struct	qca199x_dev *qca199x_dev;
	int		gpio_clk_req_level = 0;

	qca199x_dev =	container_of(work, struct qca199x_dev,
			msm_clock_controll_work);
	client =	qca199x_dev->client;

	/* Read status level of CLK_REQ from NFC Controller, QCA199_x */
	gpio_clk_req_level = gpio_get_value(qca199x_dev->irq_gpio_clk_req);
	if (gpio_clk_req_level == 1) {
		if (qca199x_dev->clk_run == false) {
			msm_gpiomux_write(qca199x_dev->clk_src_gpio,
				GPIOMUX_ACTIVE, &nfc_clk_on, NULL);
			msm_gpiomux_write(qca199x_dev->clk_src_gpio,
				GPIOMUX_SUSPENDED, &nfc_clk_on_suspend, NULL);
			qca199x_dev->clk_run = true;
			}
	} else{
		if (qca199x_dev->clk_run == true) {
			msm_gpiomux_write(qca199x_dev->clk_src_gpio,
				GPIOMUX_ACTIVE, &nfc_clk_off, NULL);
			msm_gpiomux_write(qca199x_dev->clk_src_gpio,
				GPIOMUX_SUSPENDED, &nfc_clk_off, NULL);
			qca199x_dev->clk_run = false;
		}
	}
}

/*
 * ONLY for FTM-RAW-I2C Mode
 * Required to instigate a read, which comes from DT layer. This means we need
 * to spoof an interrupt and send a wake up event.
 */
void ftm_raw_trigger_read(struct qca199x_dev *qca199x_dev)
{
	unsigned long flags;

	spin_lock_irqsave(&qca199x_dev->irq_enabled_lock, flags);
	qca199x_dev->count_irq++;
	spin_unlock_irqrestore(&qca199x_dev->irq_enabled_lock, flags);
	wake_up(&qca199x_dev->read_wq);
}

static ssize_t nfc_read(struct file *filp, char __user *buf,
					size_t count, loff_t *offset)
{
	struct qca199x_dev *qca199x_dev = filp->private_data;
	unsigned char tmp[MAX_BUFFER_SIZE], rd_byte;
	unsigned char len[PAYLOAD_HEADER_LENGTH];
	int total, length, ret;
	int ftm_rerr_code;
	enum ehandler_mode dmode;

	total = 0;
	length = 0;
	if (count > MAX_BUFFER_SIZE)
		count = MAX_BUFFER_SIZE;

	mutex_lock(&qca199x_dev->read_mutex);
	memset(tmp, 0, sizeof(tmp));
	memset(len, 0, sizeof(len));
	dmode = device_mode.handle_flavour;
	/* FTM-RAW-I2C RD/WR MODE - Special Case */
	if ((dmode == UNSOLICITED_FTM_RAW_MODE) ||
		(dmode == SOLICITED_FTM_RAW_MODE)) {
		/* READ */
		if ((ftm_raw_write_mode == 0) && (ftm_werr_code == 0)) {
			ftm_rerr_code = i2c_master_recv(qca199x_dev->client,
						&rd_byte, 1);
			if (ftm_rerr_code == 0x1)
				ftm_rerr_code = 0;
			tmp[0] = (unsigned char)ftm_rerr_code;
			tmp[1] = rd_byte;
			total  = 2;
			ret = copy_to_user(buf, tmp, total);
		}
		/* WRITE */
		else if ((ftm_raw_write_mode == 1) || (ftm_werr_code != 0)) {
			tmp[0] = (unsigned char)ftm_werr_code;
			total = 1;
			ret = copy_to_user(buf, tmp, total);
		} else {
			/* Invalid case */
			total = 0;
			ret = copy_to_user(buf, tmp, total);
		}
		mutex_unlock(&qca199x_dev->read_mutex);
		goto done;
	}

	/* NORMAL NCI Behaviour */
	/* Read the header */
	ret = i2c_master_recv(qca199x_dev->client, len, PAYLOAD_HEADER_LENGTH);
	/*
		We ignore all packets of length PAYLOAD_HEADER_LENGTH
		or less (i.e <=3). In this case return a total length
		of ZERO. So ALL PACKETS MUST HAVE A PAYLOAD.
		If ret < 0 then this is an error code.
	*/
	if (ret != PAYLOAD_HEADER_LENGTH) {
		if (ret < 0)
			total = ret;
		else
			total = 0;
		goto err;
	}
	length = len[PAYLOAD_HEADER_LENGTH - 1];
	if (length == 0) {
		ret = 0;
		total = ret;
		goto err;
	}
	/** make sure full packet fits in the buffer **/
	if ((length > 0) && ((length + PAYLOAD_HEADER_LENGTH) <= count)) {
		/* Read the packet */
		ret = i2c_master_recv(qca199x_dev->client, tmp, (length +
			PAYLOAD_HEADER_LENGTH));
		total = ret;
		if (ret < 0)
			goto err;
	}

	if (total > 0) {
		if ((total > count) || copy_to_user(buf, tmp, total)) {
			dev_err(&qca199x_dev->client->dev,
				"failed to copy to user space, total = %d\n",
					total);
			total = -EFAULT;
		}
	}
err:
		mutex_unlock(&qca199x_dev->read_mutex);
done:
	return total;
}

/*
	Local routine to read from nfcc buffer. This is called to clear any
	pending receive messages in the nfcc's read buffer, which may be there
	following a POR. In this way, the upper layers (Device Transport) will
	associate the next rsp/ntf nci message with the next nci command to the
	nfcc. Otherwise, the DT may interpret a ntf from the nfcc as being from
	the nci core reset command when in fact it was already present in the
	nfcc read buffer following a POR.
*/

int nfcc_read_buff_svc(struct qca199x_dev *qca199x_dev)
{
	unsigned char tmp[PACKET_MAX_LENGTH];
	unsigned char len[PAYLOAD_HEADER_LENGTH];
	int total, length, ret;
	total = 0;
	length = 0;
	mutex_lock(&qca199x_dev->read_mutex);
	memset(tmp, 0, sizeof(tmp));
	memset(len, 0, sizeof(len));

	/* Read the header */
	ret = i2c_master_recv(qca199x_dev->client, len, PAYLOAD_HEADER_LENGTH);
	if (ret < PAYLOAD_HEADER_LENGTH) {
		total = ret;
		goto leave;
	}
	length = len[PAYLOAD_HEADER_LENGTH - 1];
	if (length == 0) {
		ret = PAYLOAD_HEADER_LENGTH;
		total = ret;
		goto leave;
	}
	/** make sure full packet fits in the buffer **/
	if ((length > 0) && ((length + PAYLOAD_HEADER_LENGTH) <= PACKET_MAX_LENGTH)) {
		/* Read the packet */
		ret = i2c_master_recv(qca199x_dev->client, tmp, (length +
			PAYLOAD_HEADER_LENGTH));
		total = ret;
	}
leave:
	mutex_unlock(&qca199x_dev->read_mutex);
	return total;
}

static ssize_t nfc_write(struct file *filp, const char __user *buf,
				size_t count, loff_t *offset)
{
	struct qca199x_dev *qca199x_dev = filp->private_data;
	char tmp[MAX_BUFFER_SIZE];
	int ret = 0;
	enum ehandler_mode dmode;
	int nfcc_buffer = 0;

	if (count > MAX_BUFFER_SIZE) {
		dev_err(&qca199x_dev->client->dev, "out of memory\n");
		return -ENOMEM;
	}
	if (copy_from_user(tmp, buf, count)) {
		dev_err(&qca199x_dev->client->dev,
			"nfc-nci write: failed to copy from user space\n");
		return -EFAULT;
	}
	/*
		A catch for when the DT is sending the initial NCI write
		following a hardware POR. In this case we should clear any
		pending messages in nfcc buffer and open the interrupt gate
		for new messages coming from the nfcc.
	*/
	if ((qca199x_dev->sent_first_nci_write == false) &&
		 (qca199x_dev->irq_enabled == false)) {
		/* check rsp/ntf from nfcc read-side buffer */
		nfcc_buffer = nfcc_read_buff_svc(qca199x_dev);
		/* There has been an error while reading from nfcc */
		if (nfcc_buffer < 0) {
			dev_err(&qca199x_dev->client->dev,
				"nfc-nci write: error while servicing nfcc read buffer\n");
		}
		qca199x_dev->sent_first_nci_write = true;
		qca199x_enable_irq(qca199x_dev);
	}
	mutex_lock(&qca199x_dev->read_mutex);
	dmode = device_mode.handle_flavour;
	/* FTM-DIRECT-I2C RD/WR MODE */
	/* This is a special FTM-i2c mode case, where tester is not using NCI */
	if ((dmode == UNSOLICITED_FTM_RAW_MODE) ||
		(dmode == SOLICITED_FTM_RAW_MODE)) {
		/* Read From Register */
		if (count == 1) {
			ftm_raw_write_mode = 0;
			ret = i2c_master_send(qca199x_dev->client, tmp, count);
			if (ret == 1)
				ftm_werr_code = 0;
			else
				ftm_werr_code = ret;
			ftm_raw_trigger_read(qca199x_dev);
		}
		/* Write to Register */
		if (count == 2) {
			ftm_raw_write_mode = 1;
			ret = i2c_master_send(qca199x_dev->client, tmp, count);
			if (ret == 2)
				ftm_werr_code = 0;
			else
				ftm_werr_code = ret;
			ftm_raw_trigger_read(qca199x_dev);
		}
	} else {
		/* NORMAL NCI behaviour - NB :
		We can be in FTM mode here also */
		ret = i2c_master_send(qca199x_dev->client, tmp, count);
	}
	if (ret != count) {
		dev_err(&qca199x_dev->client->dev,
		"NFC: failed to write %d\n", ret);
		ret = -EIO;
	}
	mutex_unlock(&qca199x_dev->read_mutex);

	return ret;
}

static int nfc_open(struct inode *inode, struct file *filp)
{
	int ret = 0;

	struct qca199x_dev *qca199x_dev = container_of(filp->private_data,
							struct qca199x_dev,
							qca199x_device);

	filp->private_data = qca199x_dev;
	qca199x_init_stat(qca199x_dev);
	/* Enable interrupts from NFCC NFC_INT new NCI data available */
	qca199x_enable_irq(qca199x_dev);

	if ((!strcmp(qca199x_dev->clk_src_name, "GPCLK")) ||
		(!strcmp(qca199x_dev->clk_src_name, "GPCLK2"))) {
		/* Enable interrupts from NFCC CLK_REQ */
		qca199x_enable_irq_clk_req(qca199x_dev);
	}
	dev_dbg(&qca199x_dev->client->dev,
			"%d,%d\n", imajor(inode), iminor(inode));
	return ret;
}

/*
 * Wake/Sleep Mode
 */
int nfcc_wake(int level, struct file *filp)
{
	int r = 0;
	unsigned char raw_nci_sleep[] = {0x2F, 0x03, 0x00};
	/* Change slave address to 0xE */
	unsigned char raw_nci_wake[]  = {0x10, 0x0F};
	unsigned short	slave_addr	=	0xE;
	unsigned short	curr_addr;
	struct qca199x_dev *qca199x_dev = filp->private_data;

	dev_dbg(&qca199x_dev->client->dev, "nfcc_wake: %s: info: %p\n",
			__func__, qca199x_dev);

	if (level == NFCC_SLEEP) {
		r = i2c_master_send(qca199x_dev->client, &raw_nci_sleep[0],
						sizeof(raw_nci_sleep));

		r = sizeof(raw_nci_sleep);
		if (r != sizeof(raw_nci_sleep))
			return -EMSGSIZE;
		qca199x_dev->state = NFCC_STATE_NORMAL_SLEEP;
	} else {
		curr_addr = qca199x_dev->client->addr;
		qca199x_dev->client->addr = slave_addr;
		r = nfc_i2c_write(qca199x_dev->client, &raw_nci_wake[0],
						sizeof(raw_nci_wake));
		/* Restore original NFCC slave I2C address */
		qca199x_dev->client->addr = curr_addr;
		r = sizeof(raw_nci_wake);
		if (r != sizeof(raw_nci_wake))
			return -EMSGSIZE;
		qca199x_dev->state = NFCC_STATE_NORMAL_WAKE;
	}

	return r;
}

/*
 * Inside nfc_ioctl_power_states
 *
 * @brief   ioctl functions
 *
 *
 * Device control
 * remove control via ioctl
 * (arg = 0): NFC_DISABLE   GPIO = 0
 * (arg = 1): NFC_DISABLE   GPIO = 1
 *  NOT USED   (arg = 2): FW_DL GPIO = 0
 *  NOT USED   (arg = 3): FW_DL GPIO = 1
 * (arg = 4): NFCC_WAKE  = 1
 * (arg = 5): NFCC_WAKE  = 0
 *
 *
 */
int nfc_ioctl_power_states(struct file *filp, unsigned int cmd,
							unsigned long arg)
{
	int r = 0;
	struct qca199x_dev *qca199x_dev = filp->private_data;

	if (arg == 0) {
		r = qca199x_clock_select(qca199x_dev);
		if (r < 0)
			goto err_req;
		gpio_set_value(qca199x_dev->dis_gpio, 0);
		r = gpio_direction_output(qca199x_dev->dis_gpio, 1);
		if (r) {
			dev_err(&qca199x_dev->client->dev,
					"unable to set direction for gpio [%d]\n",
					qca199x_dev->dis_gpio);
			goto err_req;
		}
		gpio_set_value(qca199x_dev->dis_gpio, 0);
		msleep(20);
	} else if (arg == 1) {
		/*
			We are attempting a hardware reset so let us disable
			interrupts to avoid spurious notifications to upper
			layers.
		*/
		qca199x_disable_irq(qca199x_dev);
		/* Deselection of clock */
		r = qca199x_clock_deselect(qca199x_dev);
		if (r < 0)
			goto err_req;
		/*
			Also, set flag for initial NCI write following resetas
			may wish to do some house keeping. Ensure no pending
			messages in NFCC buffers which may be wrongly
			construed as response to initial message
		*/
		qca199x_dev->sent_first_nci_write = false;
		gpio_set_value(qca199x_dev->dis_gpio, 0);
		r = gpio_direction_output(qca199x_dev->dis_gpio, 1);
		if (r) {
			dev_err(&qca199x_dev->client->dev,
					"unable to set direction for gpio [%d]\n",
					qca199x_dev->dis_gpio);
			goto err_req;
		}
		gpio_set_value(qca199x_dev->dis_gpio, 1);
		usleep(1000);
	} else if (arg == 2) {
		mutex_lock(&qca199x_dev->read_mutex);
		r = nfcc_initialise(qca199x_dev->client, 0xE);
		/* Also reset first NCI write */
		qca199x_dev->sent_first_nci_write = false;
		mutex_unlock(&qca199x_dev->read_mutex);
		if (r) {
			dev_err(&qca199x_dev->client->dev,
				"nfc_ioctl_power_states: request nfcc initialise failed\n");
			goto err_req;
		}
	} else if (arg == 3) {
		msleep(20);
	} else if (arg == 4) {
		mutex_lock(&qca199x_dev->read_mutex);
		nfcc_wake(NFCC_WAKE, filp);
		mutex_unlock(&qca199x_dev->read_mutex);
	} else if (arg == 5) {
		nfcc_wake(NFCC_SLEEP, filp);
	} else {
		r = -ENOIOCTLCMD;
	}

err_req:
	return r;
}

/*
 * Inside nfc_ioctl_nfcc_mode
 *
 * @brief   nfc_ioctl_nfcc_mode
 *
 * (arg = 0) ; NORMAL_MODE - Standard mode, unsolicited read behaviour
 * (arg = 1) ; SOLICITED_MODE - As above but reads are solicited from User Land
 * (arg = 2) ; UNSOLICITED_FTM_RAW MODE - NORMAL_MODE but messages from FTM and
 *             not NCI Host.
 * (arg = 2) ; SOLICITED_FTM_RAW_MODE - As SOLICITED_MODE but messages from FTM
 *             and not NCI Host.
 *
 *
 *
 */
int nfc_ioctl_nfcc_mode(struct file *filp, unsigned int cmd, unsigned long arg)
{
	int retval = 0;

	static unsigned short nci_addr;
	struct qca199x_dev *qca199x_dev = filp->private_data;
	struct qca199x_platform_data *platform_data;

	platform_data = qca199x_dev->client->dev.platform_data;

	if (arg == 0) {
		device_mode.handle_flavour = UNSOLICITED_MODE;
		qca199x_dev->client->addr = NCI_I2C_SLAVE;
		/* enable interrupts again */
		qca199x_enable_irq(qca199x_dev);
	} else if (arg == 1) {
		device_mode.handle_flavour = SOLICITED_MODE;
		qca199x_dev->client->addr = qca199x_dev->client->addr;
		/* enable interrupts again */
		qca199x_enable_irq(qca199x_dev);
	} else if (arg == 2) {
		device_mode.handle_flavour = UNSOLICITED_FTM_RAW_MODE;
		nci_addr = qca199x_dev->client->addr;
		/* replace with new client slave address*/
		qca199x_dev->client->addr = 0xE;
		/* We also need to disable interrupts */
		qca199x_disable_irq(qca199x_dev);
	} else if (arg == 3) {
		device_mode.handle_flavour = SOLICITED_FTM_RAW_MODE;
		nci_addr = qca199x_dev->client->addr;
		/* replace with new client slave address*/
		qca199x_dev->client->addr = 0xE;
		/* We also need to disable interrupts */
		qca199x_disable_irq(qca199x_dev);
	} else {
		device_mode.handle_flavour = UNSOLICITED_MODE;
		qca199x_dev->client->addr = NCI_I2C_SLAVE;
	}
	return retval;
}

/*
 * Inside nfc_ioctl_nfcc_version
 *
 * @brief   nfc_ioctl_nfcc_version
 *
 *
 */
int nfc_ioctl_nfcc_version(struct file *filp, unsigned int cmd,
				unsigned long arg)
{
	int r = 0;
	unsigned short	slave_addr	=	0xE;
	unsigned short	curr_addr;

	unsigned char raw_chip_version_addr		= 0x00;
	unsigned char raw_chip_rev_id_addr		= 0x9C;
	unsigned char raw_chip_version			= 0xFF;

	struct qca199x_dev *qca199x_dev = filp->private_data;
	struct qca199x_platform_data *platform_data;

	platform_data = qca199x_dev->client->dev.platform_data;

	if (arg == 0) {
		curr_addr = qca199x_dev->client->addr;
		qca199x_dev->client->addr = slave_addr;
		r = nfc_i2c_write(qca199x_dev->client,
				&raw_chip_version_addr, 1);
		if (r < 0)
			goto invalid_wr;
		usleep(10);
		r = i2c_master_recv(qca199x_dev->client, &raw_chip_version, 1);
		/* Restore original NFCC slave I2C address */
		qca199x_dev->client->addr = curr_addr;
	}
	if (arg == 1) {
		curr_addr = qca199x_dev->client->addr;
		qca199x_dev->client->addr = slave_addr;
		r = nfc_i2c_write(qca199x_dev->client,
				&raw_chip_rev_id_addr, 1);
		if (r < 0)
			goto invalid_wr;
		usleep(10);
		r = i2c_master_recv(qca199x_dev->client, &raw_chip_version, 1);
		/* Restore original NFCC slave I2C address */
		qca199x_dev->client->addr = curr_addr;
	}

	return raw_chip_version;
invalid_wr:
	raw_chip_version = 0xFF;
	dev_err(&qca199x_dev->client->dev,
			"\nNFCC_INVALID_CHIP_VERSION = %d\n", raw_chip_version);
	return raw_chip_version;
}

/*
 * Inside nfc_ioctl_kernel_logging
 *
 * @brief   nfc_ioctl_kernel_logging
 *
 * (arg = 0) ; NO_LOGGING
 * (arg = 1) ; COMMS_LOGGING - BASIC LOGGING - Mainly just comms over I2C
 * (arg = 2) ; FULL_LOGGING - ENABLE ALL  - DBG messages for handlers etc.
 *           ; ! Be aware as amount of logging could impact behaviour !
 *
 *
 */
int nfc_ioctl_kernel_logging(unsigned long arg,  struct file *filp)
{
	int retval = 0;
	struct qca199x_dev *qca199x_dev = container_of(filp->private_data,
							   struct qca199x_dev,
							   qca199x_device);
	if (arg == 0) {
		dev_dbg(&qca199x_dev->client->dev,
		"nfc_ioctl_kernel_logging : level = NO_LOGGING\n");
		logging_level = 0;
	} else if (arg == 1) {
		dev_dbg(&qca199x_dev->client->dev,
		"nfc_ioctl_kernel_logging: level = COMMS_LOGGING only\n");
		logging_level = 1;
	} else if (arg == 2) {
		dev_dbg(&qca199x_dev->client->dev,
		"nfc_ioctl_kernel_logging: level = FULL_LOGGING\n");
		logging_level = 2;
	}
	return retval;
}

static long nfc_ioctl(struct file *pfile, unsigned int cmd, unsigned long arg)
{
	int r = 0;

	switch (cmd) {

	case NFC_SET_PWR:
		nfc_ioctl_power_states(pfile, cmd, arg);
		break;
	case NFCC_MODE:
		nfc_ioctl_nfcc_mode(pfile, cmd, arg);
		break;
	case NFCC_VERSION:
		r = nfc_ioctl_nfcc_version(pfile, cmd, arg);
		break;
	case NFC_KERNEL_LOGGING_MODE:
		nfc_ioctl_kernel_logging(arg, pfile);
		break;
	case SET_RX_BLOCK:
		break;
	case SET_EMULATOR_TEST_POINT:
		break;
	default:
		r = -ENOIOCTLCMD;
	}
	return r;
}

static const struct file_operations nfc_dev_fops = {
	.owner = THIS_MODULE,
	.llseek = no_llseek,
	.poll  = nfc_poll,
	.read  = nfc_read,
	.write = nfc_write,
	.open = nfc_open,
	.unlocked_ioctl = nfc_ioctl
};

void dumpqca1990(struct i2c_client *client)
{
	int r = 0;
	int i = 0;
	unsigned char raw_reg_rd = {0x0};
	unsigned short temp_addr;

	temp_addr = client->addr;
	client->addr = 0x0E;

	for (i = 0; i < MAX_QCA_REG; i++) {
		raw_reg_rd = i;
		if (((i >= 0x0) && (i < 0x4)) || ((i > 0x7) && (i < 0xA)) ||
		((i > 0xF) && (i < 0x12)) || ((i > 0x39) && (i < 0x4d)) ||
		((i > 0x69) && (i < 0x74)) || (i == 0x18) || (i == 0x30) ||
		(i == 0x58)) {
			r = nfc_i2c_write(client, &raw_reg_rd, 1);
			msleep(20);
			r = i2c_master_recv(client, &raw_reg_rd, 1);
		}
	}
	client->addr = temp_addr;
}

static int nfc_i2c_write(struct i2c_client *client, u8 *buf, int len)
{
	int r;

	r = i2c_master_send(client, buf, len);
	dev_dbg(&client->dev, "send: %d\n", r);
	if (r == -EREMOTEIO) { /* Retry, chip was in standby */
		usleep_range(6000, 10000);
		r = i2c_master_send(client, buf, len);
		dev_dbg(&client->dev, "send2: %d\n", r);
	}
	if (r != len)
		return -EREMOTEIO;

	return r;
}

/* Check for availability of qca199x_ NFC controller hardware */
static int nfcc_hw_check(struct i2c_client *client, unsigned short curr_addr)
{
	int r = 0;
	unsigned char buf = 0;

	client->addr = curr_addr;
	/* Set-up Addr 0. No data written */
	r = i2c_master_send(client, &buf, 1);
	if (r < 0)
		goto err_presence_check;
	buf = 0;
	/* Read back from Addr 0 */
	r = i2c_master_recv(client, &buf, 1);
	if (r < 0)
		goto err_presence_check;

	r = 0;
	return r;

err_presence_check:
	r = -ENXIO;
	dev_err(&client->dev,
		"nfc-nci nfcc_presence check - no NFCC available\n");
	return r;
}
/* Initialise qca199x_ NFC controller hardware */
static int nfcc_initialise(struct i2c_client *client, unsigned short curr_addr)
{
	int r = 0;
	unsigned char raw_1p8_CONTROL_011[]	= {0x11, XTAL_CLOCK};
	unsigned char raw_1P8_CONTROL_010[]	= {0x10, PWR_EN};
	unsigned char raw_1P8_X0_0B0[]		= {0xB0, (FREQ_SEL)};
	unsigned char raw_slave1[]		= {0x09, NCI_I2C_SLAVE};
	unsigned char raw_slave2[]		= {0x8, 0x10};
	unsigned char raw_s73[]			= {0x73, 0x02};
	unsigned char raw_slave1_rd		= {0x0};
	unsigned char raw_1P8_PAD_CFG_CLK_REQ[]	= {0xA5, 0x1};
	unsigned char raw_1P8_PAD_CFG_PWR_REQ[]	= {0xA7, 0x1};
	unsigned char buf = 0;
	bool core_reset_completed = false;
	unsigned char rsp[6];
	int time_taken = 0;
	int ret = 0;

	client->addr = curr_addr;
	r = i2c_master_send(client, &buf, 1);
	if (r < 0)
		goto err_init;

	buf = 0;
	r = i2c_master_recv(client, &buf, 1);
	if (r < 0)
		goto err_init;

	if (0x10 != (0x10 & buf)) {
		RAW(s73, 0x02);

		r = nfc_i2c_write(client, &raw_s73[0], sizeof(raw_s73));
		if (r < 0)
			goto err_init;

		usleep(1000);
		RAW(1p8_CONTROL_011, XTAL_CLOCK | 0x01);

		r = nfc_i2c_write(client, &raw_1p8_CONTROL_011[0],
						sizeof(raw_1p8_CONTROL_011));
		if (r < 0)
			goto err_init;

		usleep(1000);
		RAW(1P8_CONTROL_010, (0x8));
		r = nfc_i2c_write(client, &raw_1P8_CONTROL_010[0],
						sizeof(raw_1P8_CONTROL_010));
		if (r < 0)
			goto err_init;

		usleep(10000);  /* 10ms wait */
		RAW(1P8_CONTROL_010, (0xC));
		r = nfc_i2c_write(client, &raw_1P8_CONTROL_010[0],
					sizeof(raw_1P8_CONTROL_010));
		if (r < 0)
			goto err_init;

		usleep(100);  /* 100uS wait */
		RAW(1P8_X0_0B0, (FREQ_SEL_19));
		r = nfc_i2c_write(client, &raw_1P8_X0_0B0[0],
						sizeof(raw_1P8_X0_0B0));
		if (r < 0)
			goto err_init;

		usleep(1000);

		/* PWR_EN = 1 */
		RAW(1P8_CONTROL_010, (0xd));
		r = nfc_i2c_write(client, &raw_1P8_CONTROL_010[0],
						sizeof(raw_1P8_CONTROL_010));
		if (r < 0)
			goto err_init;


		usleep(20000);  /* 20ms wait */
		/* LS_EN = 1 */
		RAW(1P8_CONTROL_010, 0xF);
		r = nfc_i2c_write(client, &raw_1P8_CONTROL_010[0],
						sizeof(raw_1P8_CONTROL_010));
		if (r < 0)
			goto err_init;

		usleep(20000);  /* 20ms wait */

		/* Enable the PMIC clock */
		RAW(1P8_PAD_CFG_CLK_REQ, (0x1));
		r = nfc_i2c_write(client, &raw_1P8_PAD_CFG_CLK_REQ[0],
					  sizeof(raw_1P8_PAD_CFG_CLK_REQ));
		if (r < 0)
			goto err_init;

		usleep(1000);

		RAW(1P8_PAD_CFG_PWR_REQ, (0x1));
		r = nfc_i2c_write(client, &raw_1P8_PAD_CFG_PWR_REQ[0],
					  sizeof(raw_1P8_PAD_CFG_PWR_REQ));
		if (r < 0)
			goto err_init;

		usleep(1000);

		RAW(slave2, 0x10);
		r = nfc_i2c_write(client, &raw_slave2[0], sizeof(raw_slave2));
		if (r < 0)
			goto err_init;

		usleep(1000);

		RAW(slave1, NCI_I2C_SLAVE);
		r = nfc_i2c_write(client, &raw_slave1[0], sizeof(raw_slave1));
		if (r < 0)
			goto err_init;

		usleep(1000);

		/* QCA199x NFCC CPU should now boot... */
		r = i2c_master_recv(client, &raw_slave1_rd, 1);
		/* Talk on NCI slave address NCI_I2C_SLAVE 0x2C*/
		client->addr = NCI_I2C_SLAVE;

		/*
			Start with small delay and then we will poll until we
			get a core reset notification - This is time for chip
			& NFCC controller to come-up.
		*/
		usleep(1000); /* 1 ms */

		do {
			ret = i2c_master_recv(client, rsp, 5);
			/* Found core reset notification */
			if (((rsp[0] == CORE_RESET_RSP_GID) &&
				(rsp[1] == CORE_RESET_OID) &&
				(rsp[2] == CORE_RST_NTF_LENGTH))
					|| time_taken == NTF_TIMEOUT) {
				core_reset_completed = true;
			}
			usleep(10);  /* 10us sleep before retry */
			time_taken++;
		} while (!core_reset_completed);
		r = 0;
	} else {
		goto err_init;
	}
	return r;
err_init:
	r = 1;
	dev_err(&client->dev,
		"nfc-nci nfcc_initialise: failed. Check Hardware\n");
	return r;
}
/*
	Routine to Select clocks
*/
static int qca199x_clock_select(struct qca199x_dev *qca199x_dev)
{
	int r = 0;

	if (!strcmp(qca199x_dev->clk_src_name, "BBCLK2")) {
		qca199x_dev->s_clk  =
			clk_get(&qca199x_dev->client->dev, "ref_clk");
		if (qca199x_dev->s_clk == NULL)
			goto err_invalid_dis_gpio;
	} else if (!strcmp(qca199x_dev->clk_src_name, "RFCLK3")) {
		qca199x_dev->s_clk  =
			clk_get(&qca199x_dev->client->dev, "ref_clk_rf");
		if (qca199x_dev->s_clk == NULL)
			goto err_invalid_dis_gpio;
	} else if (!strcmp(qca199x_dev->clk_src_name, "GPCLK")) {
		if (gpio_is_valid(qca199x_dev->clk_src_gpio)) {
			qca199x_dev->s_clk  =
				clk_get(&qca199x_dev->client->dev, "core_clk");
			if (qca199x_dev->s_clk == NULL)
				goto err_invalid_dis_gpio;
		} else {
			goto err_invalid_dis_gpio;
		}
	} else if (!strcmp(qca199x_dev->clk_src_name, "GPCLK2")) {
		if (gpio_is_valid(qca199x_dev->clk_src_gpio)) {
			qca199x_dev->s_clk  =
				clk_get(&qca199x_dev->client->dev, "core_clk_pvt");
			if (qca199x_dev->s_clk == NULL)
				goto err_invalid_dis_gpio;
		} else {
			goto err_invalid_dis_gpio;
		}
	} else {
		qca199x_dev->s_clk = NULL;
		goto err_invalid_dis_gpio;
	}
	if (qca199x_dev->clk_run == false) {
		/* Set clock rate */
		if ((!strcmp(qca199x_dev->clk_src_name, "GPCLK")) ||
			(!strcmp(qca199x_dev->clk_src_name, "GPCLK2"))) {
			r = clk_set_rate(qca199x_dev->s_clk, NFC_RF_CLK_FREQ);
			if (r)
				goto err_invalid_clk;
		}

		r = clk_prepare_enable(qca199x_dev->s_clk);
		if (r)
			goto err_invalid_clk;
		qca199x_dev->clk_run = true;
	}
	r = 0;
	return r;

err_invalid_clk:
	r = -1;
	return r;
err_invalid_dis_gpio:
	r = -2;
	return r;
}
/*
	Routine to De-Select clocks
*/

static int qca199x_clock_deselect(struct qca199x_dev *qca199x_dev)
{
	int r = -1;
	if (qca199x_dev->s_clk != NULL) {
		if (qca199x_dev->clk_run == true) {
			clk_disable_unprepare(qca199x_dev->s_clk);
			qca199x_dev->clk_run = false;
		}
		return 0;
	}
	return r;
}

static int nfc_parse_dt(struct device *dev, struct qca199x_platform_data *pdata)
{
	int r = 0;
	struct device_node *np = dev->of_node;

	r = of_property_read_u32(np, "reg", &pdata->reg);
	if (r)
		return -EINVAL;

	pdata->dis_gpio = of_get_named_gpio(np, "qcom,dis-gpio", 0);
	if ((!gpio_is_valid(pdata->dis_gpio)))
		return -EINVAL;

	pdata->irq_gpio = of_get_named_gpio(np, "qcom,irq-gpio", 0);
	if ((!gpio_is_valid(pdata->irq_gpio)))
		return -EINVAL;

	r = of_property_read_string(np, "qcom,clk-src", &pdata->clk_src_name);

	if (strcmp(pdata->clk_src_name, "GPCLK2")) {
		r = of_property_read_u32(np, "qcom,clk-gpio",
					&pdata->clkreq_gpio);
		if (r)
			return -EINVAL;
	}

	if ((!strcmp(pdata->clk_src_name, "GPCLK")) ||
	    (!strcmp(pdata->clk_src_name, "GPCLK2"))) {
			pdata->clk_src_gpio = of_get_named_gpio(np,
					"qcom,clk-src-gpio", 0);
			if ((!gpio_is_valid(pdata->clk_src_gpio)))
				return -EINVAL;
			pdata->irq_gpio_clk_req = of_get_named_gpio(np,
					"qcom,clk-req-gpio", 0);
			if ((!gpio_is_valid(pdata->irq_gpio_clk_req)))
				return -EINVAL;
	}
	if (r)
		return -EINVAL;
	return r;
}

static int qca199x_probe(struct i2c_client *client,
			const struct i2c_device_id *id)
{
	int r = 0;
	int irqn = 0;
	struct device_node *node = client->dev.of_node;
	struct qca199x_platform_data *platform_data;
	struct qca199x_dev *qca199x_dev;

	if (client->dev.of_node) {
		platform_data = devm_kzalloc(&client->dev,
			sizeof(struct qca199x_platform_data), GFP_KERNEL);
		if (!platform_data) {
			dev_err(&client->dev,
			"nfc-nci probe: Failed to allocate memory\n");
			return -ENOMEM;
		}
		r = nfc_parse_dt(&client->dev, platform_data);
		if (r)
			return r;
	} else {
		platform_data = client->dev.platform_data;
	}
	if (!platform_data)
		return -EINVAL;
	dev_dbg(&client->dev,
		"nfc-nci probe: %s, inside nfc-nci flags = %x\n",
		__func__, client->flags);
	if (platform_data == NULL) {
		dev_err(&client->dev, "nfc-nci probe: failed\n");
		return -ENODEV;
	}
	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
		dev_err(&client->dev, "nfc-nci probe: need I2C_FUNC_I2C\n");
		return -ENODEV;
	}
	qca199x_dev = kzalloc(sizeof(*qca199x_dev), GFP_KERNEL);
	if (qca199x_dev == NULL) {
		dev_err(&client->dev,
		"nfc-nci probe: failed to allocate memory for module data\n");
		return -ENOMEM;
	}
	qca199x_dev->client = client;

	/*
	 * To be efficient we need to test whether nfcc hardware is physically
	 * present before attempting further hardware initialisation.
	 * For this we need to be sure the device is in ULPM state by
	 * setting disable line low early on.
	 *
	 */


	if (gpio_is_valid(platform_data->dis_gpio)) {
		r = gpio_request(platform_data->dis_gpio, "nfc_reset_gpio");
		if (r) {
			dev_err(&client->dev,
			"NFC: unable to request gpio [%d]\n",
				platform_data->dis_gpio);
			goto err_free_dev;
		}
		r = gpio_direction_output(platform_data->dis_gpio, 1);
		if (r) {
			dev_err(&client->dev,
				"NFC: unable to set direction for gpio [%d]\n",
					platform_data->dis_gpio);
			goto err_dis_gpio;
		}
	} else {
		dev_err(&client->dev, "dis gpio not provided\n");
		goto err_free_dev;
	}

	/* Put device in ULPM */
	gpio_set_value(platform_data->dis_gpio, 0);
	r = nfcc_hw_check(client, platform_data->reg);
	if (r) {
		/* We don't think there is hardware but just in case HPD */
		gpio_set_value(platform_data->dis_gpio, 1);
		goto err_dis_gpio;
	}

	if (gpio_is_valid(platform_data->irq_gpio)) {
		r = gpio_request(platform_data->irq_gpio, "nfc_irq_gpio");
		if (r) {
			dev_err(&client->dev, "unable to request gpio [%d]\n",
				platform_data->irq_gpio);
			goto err_dis_gpio;
		}
		r = gpio_direction_input(platform_data->irq_gpio);
		if (r) {

			dev_err(&client->dev,
			"unable to set direction for gpio [%d]\n",
				platform_data->irq_gpio);
			goto err_irq;
		}
		irqn = gpio_to_irq(platform_data->irq_gpio);
		if (irqn < 0) {
			r = irqn;
			goto err_irq;
		}
		client->irq = irqn;

	} else {
		dev_err(&client->dev, "irq gpio not provided\n");
		goto err_dis_gpio;
	}
	/* Interrupt from NFCC CLK_REQ to handle REF_CLK
		o/p gating/selection */
	if ((!strcmp(platform_data->clk_src_name, "GPCLK")) ||
		(!strcmp(platform_data->clk_src_name, "GPCLK2"))) {
		if (gpio_is_valid(platform_data->irq_gpio_clk_req)) {
			r = gpio_request(platform_data->irq_gpio_clk_req,
				"nfc_irq_gpio_clk_en");
			if (r) {
				dev_err(&client->dev, "unable to request CLK_EN gpio [%d]\n",
					platform_data->irq_gpio_clk_req);
				goto err_irq;
			}
			r = gpio_direction_input(
					platform_data->irq_gpio_clk_req);
			if (r) {
				dev_err(&client->dev,
					"unable to set direction for CLK_EN gpio [%d]\n",
					platform_data->irq_gpio_clk_req);
				goto err_irq_clk;
			}
			gpio_to_irq(0);
			irqn = gpio_to_irq(platform_data->irq_gpio_clk_req);
			if (irqn < 0) {
				r = irqn;
				goto err_irq_clk;
			}
			platform_data->clk_req_irq_num = irqn;
		} else {
			dev_err(&client->dev, "irq CLK_EN gpio not provided\n");
			goto err_irq;
		}
	}
	/* Get the clock source name and gpio from from Device Tree */
	qca199x_dev->clk_src_name = platform_data->clk_src_name;
	qca199x_dev->clk_src_gpio = platform_data->clk_src_gpio;
	qca199x_dev->clk_run = false;
	r = qca199x_clock_select(qca199x_dev);
	if (r != 0) {
		if (r == -1)
			goto err_clk;
		else
			goto err_irq_clk;
	}

	if (strcmp(platform_data->clk_src_name, "GPCLK2")) {
		platform_data->clkreq_gpio =
			of_get_named_gpio(node, "qcom,clk-gpio", 0);

		if (gpio_is_valid(platform_data->clkreq_gpio)) {
			r = gpio_request(platform_data->clkreq_gpio,
				"nfc_clkreq_gpio");
			if (r) {
				dev_err(&client->dev, "unable to request gpio [%d]\n",
						platform_data->clkreq_gpio);
				goto err_clkreq_gpio;
			}
			r = gpio_direction_input(platform_data->clkreq_gpio);
			if (r) {
				dev_err(&client->dev,
						"unable to set direction for gpio [%d]\n",
						platform_data->clkreq_gpio);
				goto err_clkreq_gpio;
			}
		} else {
			dev_err(&client->dev, "clkreq gpio not provided\n");
			goto err_clk;
		}
		qca199x_dev->clkreq_gpio = platform_data->clkreq_gpio;
	}
	qca199x_dev->dis_gpio = platform_data->dis_gpio;
	qca199x_dev->irq_gpio = platform_data->irq_gpio;
	if ((!strcmp(platform_data->clk_src_name, "GPCLK")) ||
		(!strcmp(platform_data->clk_src_name, "GPCLK2"))) {
			qca199x_dev->irq_gpio_clk_req	=
						platform_data->irq_gpio_clk_req;
			qca199x_dev->clk_req_irq_num		=
						platform_data->clk_req_irq_num;
	}

	/* init mutex and queues */
	init_waitqueue_head(&qca199x_dev->read_wq);
	mutex_init(&qca199x_dev->read_mutex);
	spin_lock_init(&qca199x_dev->irq_enabled_lock);
	spin_lock_init(&qca199x_dev->irq_enabled_lock_clk_req);

	qca199x_dev->qca199x_device.minor = MISC_DYNAMIC_MINOR;
	qca199x_dev->qca199x_device.name = "nfc-nci";
	qca199x_dev->qca199x_device.fops = &nfc_dev_fops;

	r = misc_register(&qca199x_dev->qca199x_device);
	if (r) {
		dev_err(&client->dev, "misc_register failed\n");
		goto err_misc_register;
	}


	/*
	 * Reboot the NFCC now that all resources are ready
	 *
	 * The NFCC takes time to transition between power states.
	 * We wait 20uS for the NFCC to shutdown. (HPD)
	 * We wait 100uS for the NFCC to boot into ULPM.
	 */
	gpio_set_value(platform_data->dis_gpio, 1);/* HPD */
	msleep(20);
	gpio_set_value(platform_data->dis_gpio, 0);/* ULPM */
	msleep(100);


	/* Here we perform a second presence check. */
	r = nfcc_hw_check(client, platform_data->reg);
	if (r) {
		/* We don't think there is hardware but just in case HPD */
		gpio_set_value(platform_data->dis_gpio, 1);
		goto err_nfcc_not_present;
	}

	logging_level = 0;
	/* request irq.  The irq is set whenever the chip has data available
	* for reading.  It is cleared when all data has been read.
	*/
	device_mode.handle_flavour = UNSOLICITED_MODE;
	/* NFC_INT IRQ */
	qca199x_dev->irq_enabled = true;
	r = request_irq(client->irq, qca199x_dev_irq_handler,
			  IRQF_TRIGGER_RISING, client->name, qca199x_dev);
	if (r) {
		dev_err(&client->dev, "nfc-nci probe: request_irq failed\n");
		goto err_request_irq_failed;
	}
	qca199x_disable_irq(qca199x_dev);
	/* CLK_REQ IRQ */
	if ((!strcmp(platform_data->clk_src_name, "GPCLK")) ||
		(!strcmp(platform_data->clk_src_name, "GPCLK2"))) {
		r = request_irq(qca199x_dev->clk_req_irq_num,
				qca199x_dev_irq_handler_clk_req,
				(IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING),
						client->name, qca199x_dev);
		if (r) {
			dev_err(&client->dev,
			"nfc-nci probe: request_irq failed. irq no = %d\n, main irq =  %d",
				qca199x_dev->clk_req_irq_num, client->irq);
			goto err_request_irq_failed;
		}
		qca199x_dev->irq_enabled_clk_req = true;
		qca199x_disable_irq_clk_req(qca199x_dev);


		qca199x_dev->my_wq =
			create_singlethread_workqueue("qca1990x_CLK_REQ_queue");
		if (!qca199x_dev->my_wq)
			goto err_create_workq;

		INIT_WORK(&qca199x_dev->msm_clock_controll_work,
			clk_req_update);
	}
	i2c_set_clientdata(client, qca199x_dev);
	gpio_set_value(platform_data->dis_gpio, 1);
	dev_dbg(&client->dev,
	"nfc-nci probe: %s, probing qca1990 exited successfully\n",
		 __func__);
	return 0;

err_create_workq:
	dev_err(&client->dev,
	"nfc-nci probe: %s, work_queue creation failure\n",
		 __func__);
	free_irq(client->irq, qca199x_dev);
err_nfcc_not_present:
err_request_irq_failed:
	misc_deregister(&qca199x_dev->qca199x_device);
err_misc_register:
	mutex_destroy(&qca199x_dev->read_mutex);
err_clkreq_gpio:
	if (strcmp(platform_data->clk_src_name, "GPCLK2"))
		gpio_free(platform_data->clkreq_gpio);
err_clk:
		qca199x_clock_deselect(qca199x_dev);
err_irq_clk:
	if ((!strcmp(platform_data->clk_src_name, "GPCLK")) ||
		(!strcmp(platform_data->clk_src_name, "GPCLK2"))) {
		r = gpio_direction_input(platform_data->irq_gpio_clk_req);
		if (r)
			dev_err(&client->dev, "nfc-nci probe: Unable to set direction\n");
		gpio_free(platform_data->irq_gpio_clk_req);
	}
err_irq:
	gpio_free(platform_data->irq_gpio);
err_dis_gpio:
	gpio_free(platform_data->dis_gpio);
err_free_dev:
	kfree(qca199x_dev);
	return r;
}

static int qca199x_remove(struct i2c_client *client)
{
	struct qca199x_dev *qca199x_dev;

	qca199x_dev = i2c_get_clientdata(client);
	free_irq(client->irq, qca199x_dev);
	misc_deregister(&qca199x_dev->qca199x_device);
	mutex_destroy(&qca199x_dev->read_mutex);
	gpio_free(qca199x_dev->irq_gpio);
	if ((!strcmp(qca199x_dev->clk_src_name, "GPCLK")) ||
		(!strcmp(qca199x_dev->clk_src_name, "GPCLK2"))) {
		gpio_free(qca199x_dev->irq_gpio_clk_req);
	}
	gpio_free(qca199x_dev->dis_gpio);
	if (strcmp(qca199x_dev->clk_src_name, "GPCLK2"))
		gpio_free(qca199x_dev->clkreq_gpio);
	kfree(qca199x_dev);

	return 0;
}

static const struct i2c_device_id qca199x_id[] = {
	{"qca199x-i2c", 0},
	{}
};

static struct i2c_driver qca199x = {
	.id_table = qca199x_id,
	.probe = qca199x_probe,
	.remove = qca199x_remove,
	.driver = {
		.owner = THIS_MODULE,
		.name = "nfc-nci",
		.of_match_table = msm_match_table,
	},
};

/*
 * module load/unload record keeping
 */
static int __init qca199x_dev_init(void)
{
	return i2c_add_driver(&qca199x);
}
module_init(qca199x_dev_init);

static void __exit qca199x_dev_exit(void)
{
	i2c_del_driver(&qca199x);
}
module_exit(qca199x_dev_exit);

MODULE_DESCRIPTION("NFC QCA199x");
MODULE_LICENSE("GPL v2");