drivers/nfc/ese_p3.c - LeafOS-Devices/android_kernel_samsung_gta4xl - Gitiles

 /*
  * Copyright (C) 2015 Samsung Electronics. 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 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;
  *
  */

 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/fs.h>
 #include <linux/slab.h>
 #include <linux/init.h>
 #include <linux/device.h>
 #include <linux/list.h>
 #include <linux/irq.h>
 #include <linux/jiffies.h>
 #include <linux/uaccess.h>
 #include <linux/delay.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
 #include <linux/platform_device.h>
 #include <linux/gpio.h>
 #include <linux/miscdevice.h>
 #include <linux/spinlock.h>
 #include <linux/spi/spi.h>
 #include <linux/sched.h>
 #include <linux/poll.h>
 #include <linux/regulator/consumer.h>
 #include <linux/ioctl.h>
 #ifdef CONFIG_OF
 #include <linux/of_gpio.h>
 #endif

 #include <linux/platform_data/spi-s3c64xx.h>
 #include <linux/pm_runtime.h>
 #include <linux/spi/spidev.h>
 #include <linux/clk.h>
 #include <linux/wakelock.h>
 #include <linux/smc.h>

 #include "ese_p3.h"

 /* Undef if want to keep eSE Power LDO ALWAYS ON */
 #define FEATURE_ESE_POWER_ON_OFF

 #define SPI_DEFAULT_SPEED 6500000L

 /* size of maximum read/write buffer supported by driver */
 #define MAX_BUFFER_SIZE   260U

 /* Different driver debug lever */
 enum P3_DEBUG_LEVEL {
 	P3_DEBUG_OFF,
 	P3_FULL_DEBUG
 };

 /* Variable to store current debug level request by ioctl */
 static unsigned char debug_level = P3_FULL_DEBUG;

 #define P3_DBG_MSG(msg...) do { \
 		switch (debug_level) { \
 		case P3_DEBUG_OFF: \
 			break; \
 		case P3_FULL_DEBUG: \
 			pr_info("[ESE-P3] :  " msg); \
 			break; \
 			 /*fallthrough*/ \
 		default: \
 			pr_err("[ESE-P3] : debug level %d", debug_level);\
 			break; \
 		}; \
 	} while (0)

 #define P3_ERR_MSG(msg...) pr_err("[ESE-P3] : " msg)
 #define P3_INFO_MSG(msg...) pr_info("[ESE-P3] : " msg)

 static DEFINE_MUTEX(device_list_lock);

 /* Device specific macro and structure */
 struct p3_data {
 	wait_queue_head_t read_wq; /* wait queue for read interrupt */
 	struct mutex buffer_mutex; /* buffer mutex */
 	struct spi_device *spi;  /* spi device structure */
 	struct miscdevice p3_device; /* char device as misc driver */

 	unsigned int users;

 	bool device_opened;
 #ifdef FEATURE_ESE_WAKELOCK
 	struct wake_lock ese_lock;
 #endif
 	int cs_gpio;
 	unsigned long speed;
 	const char *vdd_1p8;
 	int vdd_1p8_gpio;
 #ifdef CONFIG_ESE_SECURE
 	struct clk *ese_spi_pclk;
 	struct clk *ese_spi_sclk;
 #endif
 };

 #ifndef CONFIG_ESE_SECURE
 static void p3_pinctrl_config(struct p3_data *data, bool onoff)
 {
 	struct spi_device *spi = data->spi;
 	struct device *spi_dev = spi->dev.parent->parent;
 	struct pinctrl *pinctrl = NULL;

 	P3_INFO_MSG("%s: pinctrol - %s\n", __func__, onoff ? "on" : "off");

 	if (onoff) {
 		/* ON */
 		pinctrl = devm_pinctrl_get_select(spi_dev, "ese_active");
 		if (IS_ERR_OR_NULL(pinctrl))
 			P3_ERR_MSG("%s: Failed to configure ese pin\n", __func__);
 		else
 			devm_pinctrl_put(pinctrl);
 	} else {
 		/* OFF */
 		pinctrl = devm_pinctrl_get_select(spi_dev, "ese_suspend");
 		if (IS_ERR_OR_NULL(pinctrl))
 			P3_ERR_MSG("%s: Failed to configure ese pin\n", __func__);
 		else
 			devm_pinctrl_put(pinctrl);
 	}
 }
 #endif

 #ifdef CONFIG_ESE_SECURE
 static int p3_suspend(void)
 {
 	u64 r0 = 0, r1 = 0, r2 = 0, r3 = 0;
 	int ret = 0;

 	r0 = (0x83000032);
 	ret = exynos_smc(r0, r1, r2, r3);

 	if (ret)
 		P3_ERR_MSG("P3 check suspend status! 0x%X\n", ret);

 	return ret;
 }

 static int p3_resume(void)
 {
 	u64 r0 = 0, r1 = 0, r2 = 0, r3 = 0;
 	int ret = 0;

 	r0 = (0x83000033);
 	ret = exynos_smc(r0, r1, r2, r3);

 	if (ret)
 		P3_ERR_MSG("P3 check resume status! 0x%X\n", ret);

 	return ret;
 }

 static int p3_clk_control(struct p3_data *data, bool onoff)
 {
 	static bool old_value;

 	if (old_value == onoff)
 		return 0;

 	if (onoff == true) {
 		clk_prepare_enable(data->ese_spi_pclk);
 		clk_prepare_enable(data->ese_spi_sclk);

 		/* There is a quarter-multiplier before the USI_v2 SPI */
 		clk_set_rate(data->ese_spi_sclk, data->speed * 4);
 		usleep_range(5000, 5100);
 		P3_DBG_MSG("%s clock:%lu\n", __func__, clk_get_rate(data->ese_spi_sclk));
 	} else {
 		clk_disable_unprepare(data->ese_spi_pclk);
 		clk_disable_unprepare(data->ese_spi_sclk);
 	}

 	old_value = onoff;

 	P3_INFO_MSG("clock %s\n", onoff ? "enabled" : "disabled");
 	return 0;
 }

 static int p3_clk_setup(struct device *dev, struct p3_data *data)
 {
 	data->ese_spi_pclk = clk_get(dev, "pclk");
 	if (IS_ERR(data->ese_spi_pclk)) {
 		P3_ERR_MSG("Can't get %s\n", "pclk");
 		data->ese_spi_pclk = NULL;
 		goto err_pclk_get;
 	}

 	data->ese_spi_sclk = clk_get(dev, "sclk");
 	if (IS_ERR(data->ese_spi_sclk)) {
 		P3_ERR_MSG("Can't get %s\n", "sclk");
 		data->ese_spi_sclk = NULL;
 		goto err_sclk_get;
 	}

 	return 0;
 err_sclk_get:
 	clk_put(data->ese_spi_pclk);
 err_pclk_get:
 	return -EPERM;
 }
 #endif

 static int p3_ldo_onoff(struct p3_data *data, int onoff)
 {
 	int ret = 0;

 	ret = gpio_request(data->vdd_1p8_gpio, "ese_vdd_1p8_gpio");
 	if (ret) {
 		P3_ERR_MSG("%s - failed to request ese_vdd_1p8_gpio\n", __func__);
 		return -EINVAL;
 	}
 	ret = gpio_direction_output(data->vdd_1p8_gpio, onoff);
 	if (ret) {
 		P3_ERR_MSG("%s - failed to direction_output ese_vdd_1p8_gpio\n", __func__);
 	} else {
 		P3_INFO_MSG("%s: use external LDO %d\n", __func__, onoff);
 	}
 	gpio_free(data->vdd_1p8_gpio);

 	return ret;
 }

 static int p3_regulator_onoff(struct p3_data *data, int onoff)
 {
 	int rc = 0;
 	struct regulator *regulator_vdd_1p8;

 	if (!data->vdd_1p8) {
 		if (data->vdd_1p8_gpio) {
 			rc = p3_ldo_onoff(data, onoff);
 			msleep(10);
 			return rc;
 		} else {
 			P3_ERR_MSG("%s No vdd LDO name!\n", __func__);
 			return -ENODEV;
 		}
 	}

 	regulator_vdd_1p8 = regulator_get(NULL, data->vdd_1p8);
 	pr_err("%s %s\n", __func__, data->vdd_1p8);

 	if (IS_ERR(regulator_vdd_1p8) || regulator_vdd_1p8 == NULL) {
 		P3_ERR_MSG("%s - vdd_1p8 regulator_get fail\n", __func__);
 		return -ENODEV;
 	}

 	P3_DBG_MSG("%s - onoff = %d\n", __func__, onoff);
 	if (onoff == 1) {
 		rc = regulator_enable(regulator_vdd_1p8);
 		if (rc) {
 			P3_ERR_MSG("%s - enable vdd_1p8 failed, rc=%d\n",
 				__func__, rc);
 			goto done;
 		}
 		msleep(20);
 	} else {
 		rc = regulator_disable(regulator_vdd_1p8);
 		if (rc) {
 			P3_ERR_MSG("%s - disable vdd_1p8 failed, rc=%d\n",
 				__func__, rc);
 			goto done;
 		}
 	}

 	/*data->regulator_is_enable = (u8)onoff;*/

 done:
 	regulator_put(regulator_vdd_1p8);

 	return rc;
 }

 #ifndef CONFIG_ESE_SECURE
 static int p3_xfer(struct p3_data *p3_device, struct p3_ioctl_transfer *tr)
 {
 	int status = 0;
 	struct spi_message m;
 	struct spi_transfer t;
 	unsigned char tx_buffer[MAX_BUFFER_SIZE] = {0x0, };
 	unsigned char rx_buffer[MAX_BUFFER_SIZE] = {0x0, };

 	P3_DBG_MSG("%s\n", __func__);

 	if (p3_device == NULL || tr == NULL)
 		return -EFAULT;

 	if (tr->len > MAX_BUFFER_SIZE || !tr->len) {
 		P3_ERR_MSG("%s invalid size\n", __func__);
 		return -EMSGSIZE;
 	}

 	if (tr->tx_buffer != NULL) {
 		if (copy_from_user(tx_buffer,
 				tr->tx_buffer, tr->len) != 0)
 			return -EFAULT;
 	}

 	spi_message_init(&m);
 	memset(&t, 0, sizeof(t));

 	t.tx_buf = tx_buffer;
 	t.rx_buf = rx_buffer;
 	t.len = tr->len;

 	spi_message_add_tail(&t, &m);

 	status = spi_sync(p3_device->spi, &m);
 	if (status == 0) {
 		if (tr->rx_buffer != NULL) {
 			unsigned int missing = 0;

 			missing = (unsigned int)copy_to_user(tr->rx_buffer,
 					       rx_buffer, tr->len);

 			if (missing != 0)
 				tr->len = tr->len - missing;
 		}
 	}
 	pr_debug("%s, length=%d\n", __func__, tr->len);
 	return status;

 } /* vfsspi_xfer */

 static int p3_rw_spi_message(struct p3_data *p3_device,
 				 unsigned long arg)
 {
 	struct p3_ioctl_transfer   *dup = NULL;
 	int err = 0;

 	dup = kmalloc(sizeof(struct p3_ioctl_transfer), GFP_KERNEL);
 	if (dup == NULL)
 		return -ENOMEM;

 	if (copy_from_user(dup, (void *)arg,
 			   sizeof(struct p3_ioctl_transfer)) != 0) {
 		kfree(dup);
 		return -EFAULT;
 	}

 	err = p3_xfer(p3_device, dup);
 	if (err != 0) {
 		kfree(dup);
 		P3_ERR_MSG("%s xfer failed!\n", __func__);
 		return err;
 	}

 	/*P3_ERR_MSG("%s len:%u\n", __func__, dup->len);*/
 	if (copy_to_user((void *)arg, dup,
 			 sizeof(struct p3_ioctl_transfer)) != 0)
 		return -EFAULT;
 	kfree(dup);
 	return 0;
 }

 #if 0 //def CONFIG_COMPAT
 static int p3_rw_spi_message_32(struct p3_data *p3_device, unsigned long arg)
 {
 	struct p3_ioctl_transfer dup;
 	struct spip3_ioc_transfer_32 p3transfr_32;
 	int err = 0;

 	if (__copy_from_user(&p3transfr_32, (void __user *)arg,
 				sizeof(struct spip3_ioc_transfer_32))) {
 		P3_ERR_MSG("%s, failed to copy from user\n", __func__);
 		return -EFAULT;
 	}

 	dup.tx_buffer = (unsigned char *)(unsigned long)(p3transfr_32.tx_buffer);
 	dup.rx_buffer = (unsigned char *)(unsigned long)(p3transfr_32.rx_buffer);
 	dup.len = p3transfr_32.len;

 	err = p3_xfer(p3_device, &dup);
 	if (err != 0) {
 		P3_ERR_MSG("%s xfer failed!\n", __func__);
 		return err;
 	}
 	P3_DBG_MSG("%s len:%u\n", __func__, dup.len);

 	return 0;
 }
 #endif
 #endif

 static int spip3_open(struct inode *inode, struct file *filp)
 {
 	struct p3_data *p3_dev = container_of(filp->private_data,
 			struct p3_data, p3_device);
 	int ret = 0;

 	/* for defence MULTI-OPEN */
 	if (p3_dev->device_opened) {
 		P3_ERR_MSG("%s - ALREADY opened!\n", __func__);
 		return -EBUSY;
 	}

 	mutex_lock(&device_list_lock);
 	p3_dev->device_opened = true;
 	P3_INFO_MSG("open\n");

 #ifdef FEATURE_ESE_WAKELOCK
 	wake_lock(&p3_dev->ese_lock);
 #endif

 #ifdef CONFIG_ESE_SECURE
 	p3_clk_control(p3_dev, true);
 	p3_resume();
 #else
 	p3_pinctrl_config(p3_dev, true);
 #endif

 #ifdef FEATURE_ESE_POWER_ON_OFF
 	ret = p3_regulator_onoff(p3_dev, 1);
 	if (ret < 0)
 		P3_ERR_MSG(" %s : failed to turn on LDO()\n", __func__);
 	usleep_range(2000, 2500);
 #endif

 	filp->private_data = p3_dev;

 	p3_dev->users++;
 	mutex_unlock(&device_list_lock);

 	return 0;
 }

 static int spip3_release(struct inode *inode, struct file *filp)
 {
 	struct p3_data *p3_dev = filp->private_data;
 	int ret = 0;

 	if (!p3_dev->device_opened) {
 		P3_ERR_MSG("%s - was NOT opened....\n", __func__);
 		return 0;
 	}

 	mutex_lock(&device_list_lock);

 #ifdef FEATURE_ESE_WAKELOCK
 	if (wake_lock_active(&p3_dev->ese_lock))
 		wake_unlock(&p3_dev->ese_lock);
 #endif

 	filp->private_data = p3_dev;

 	p3_dev->users--;
 	if (!p3_dev->users) {
 		p3_dev->device_opened = false;

 #ifdef CONFIG_ESE_SECURE
 	p3_clk_control(p3_dev, false);
 	p3_suspend();
 	usleep_range(1000, 1500);
 #else
 	p3_pinctrl_config(p3_dev, false);
 #endif
 #ifdef FEATURE_ESE_POWER_ON_OFF
 		ret = p3_regulator_onoff(p3_dev, 0);
 		if (ret < 0)
 			P3_ERR_MSG(" test: failed to turn off LDO()\n");

 #endif
 	}
 	mutex_unlock(&device_list_lock);

 	P3_DBG_MSG("%s, users:%d, Major Minor No:%d %d\n", __func__,
 			p3_dev->users, imajor(inode), iminor(inode));
 	return 0;
 }

 static long spip3_ioctl(struct file *filp, unsigned int cmd,
 		unsigned long arg)
 {
 	int ret = 0;
 	struct p3_data *data = NULL;

 	if (_IOC_TYPE(cmd) != P3_MAGIC) {
 		P3_ERR_MSG("%s invalid magic. cmd=0x%X Received=0x%X Expected=0x%X\n",
 				__func__, cmd, _IOC_TYPE(cmd), P3_MAGIC);
 		return -ENOTTY;
 	}

 	data = filp->private_data;

 	mutex_lock(&data->buffer_mutex);
 	switch (cmd) {
 	case P3_SET_DBG:
 		debug_level = (unsigned char)arg;
 		P3_DBG_MSG(KERN_INFO"[NXP-P3] -  Debug level %d", debug_level);
 		break;
 	case P3_ENABLE_SPI_CLK:
 		P3_DBG_MSG("%s P3_ENABLE_SPI_CLK\n", __func__);
 #ifdef CONFIG_ESE_SECURE
 		ret = p3_clk_control(data, true);
 		if (ret < 0)
 			P3_ERR_MSG("%s: Unable to enable spi clk\n", __func__);
 #endif
 		break;
 	case P3_DISABLE_SPI_CLK:
 		P3_DBG_MSG("%s P3_DISABLE_SPI_CLK\n", __func__);
 #ifdef CONFIG_ESE_SECURE
 		ret = p3_clk_control(data, false);
 		if (ret < 0)
 			P3_ERR_MSG("%s: couldn't disable spi clks\n", __func__);
 #endif
 		break;
 #ifndef CONFIG_ESE_SECURE
 	case P3_RW_SPI_DATA:
 		ret = p3_rw_spi_message(data, arg);
 		if (ret < 0)
 			P3_ERR_MSG("%s P3_RW_SPI_DATA failed [%d].\n",
 					__func__, ret);
 		break;
 #endif
 #if 0 //def CONFIG_COMPAT
 	case P3_RW_SPI_DATA_32:
 		ret = p3_rw_spi_message_32(data, arg);
 		if (ret < 0)
 			P3_ERR_MSG("%s P3_RW_SPI_DATA_32 failed [%d].\n",
 					__func__, ret);
 		break;
 #endif

 	case P3_SET_PWR:
 	case P3_SET_POLL:
 	case P3_SET_SPI_CLK:
 	case P3_ENABLE_SPI_CS:
 	case P3_DISABLE_SPI_CS:
 	case P3_ENABLE_CLK_CS:
 	case P3_DISABLE_CLK_CS:
 	case P3_SWING_CS:
 		P3_ERR_MSG("%s deprecated IOCTL:0x%X\n", __func__, cmd);
 		break;

 	default:
 		P3_DBG_MSG("%s no matching ioctl! 0x%X\n", __func__, cmd);
 		ret = -EINVAL;
 	}
 	mutex_unlock(&data->buffer_mutex);

 	return ret;
 }

 #ifndef CONFIG_ESE_SECURE
 static ssize_t spip3_write(struct file *filp, const char *buf, size_t count,
 		loff_t *offset)
 {
 	int ret = -1;
 	struct p3_data *p3_dev;
 	struct spi_message m;
 	struct spi_transfer t;
 	unsigned char tx_buffer[MAX_BUFFER_SIZE] = {0x0, };
 	unsigned char rx_buffer[MAX_BUFFER_SIZE] = {0x0, };

 	P3_INFO_MSG("spip3_write -Enter count %zu\n", count);

 	p3_dev = filp->private_data;

 	if (count > MAX_BUFFER_SIZE) {
 		P3_ERR_MSG("%s invalid size\n", __func__);
 		return -EMSGSIZE;
 	}
 	mutex_lock(&p3_dev->buffer_mutex);

 	if (copy_from_user(&tx_buffer[0], &buf[0], count)) {
 		P3_ERR_MSG("%s : failed to copy from user space\n", __func__);
 		mutex_unlock(&p3_dev->buffer_mutex);
 		return -EFAULT;
 	}

 	/* Write data */
 	spi_message_init(&m);
 	memset(&t, 0, sizeof(t));

 	t.tx_buf = tx_buffer;
 	t.rx_buf = rx_buffer;
 	t.len = count;

 	spi_message_add_tail(&t, &m);

 	gpio_set_value(p3_dev->cs_gpio, 0);
 	ret = spi_sync(p3_dev->spi, &m);
 	gpio_set_value(p3_dev->cs_gpio, 1);
 	if (ret < 0)
 		ret = -EIO;
 	else
 		ret = count;

 	mutex_unlock(&p3_dev->buffer_mutex);
 	P3_DBG_MSG(KERN_ALERT "spip3_write ret %d- Exit\n", ret);

 	return ret;
 }

 static ssize_t spip3_read(struct file *filp, char *buf, size_t count,
 		loff_t *offset)
 {
 	int ret = -EIO;
 	struct spi_message m;
 	struct spi_transfer t;
 	struct p3_data *p3_dev = filp->private_data;
 	unsigned char tx_buffer[MAX_BUFFER_SIZE] = {0x0, };
 	unsigned char rx_buffer[MAX_BUFFER_SIZE] = {0x0, };

 	if (count > MAX_BUFFER_SIZE) {
 		P3_ERR_MSG("%s invalid size\n", __func__);
 		return -EMSGSIZE;
 	}
 	P3_INFO_MSG("spip3_read count %zu - Enter\n", count);
 	mutex_lock(&p3_dev->buffer_mutex);

 	spi_message_init(&m);
 	memset(&t, 0, sizeof(t));

 	t.tx_buf = tx_buffer;
 	t.rx_buf = rx_buffer;
 	t.len = count;

 	spi_message_add_tail(&t, &m);

 	gpio_set_value(p3_dev->cs_gpio, 0);
 	ret = spi_sync(p3_dev->spi, &m);
 	gpio_set_value(p3_dev->cs_gpio, 1);

 	if (copy_to_user(buf, &rx_buffer[0], count)) {
 		P3_ERR_MSG("%s : failed to copy to user space\n", __func__);
 		ret = -EFAULT;
 		goto fail;
 	}
 	ret = count;
 	P3_DBG_MSG("%s ret %d Exit\n", __func__, ret);

 	mutex_unlock(&p3_dev->buffer_mutex);

 	return ret;

 fail:
 	P3_ERR_MSG("Error %s ret %d Exit\n", __func__, ret);
 	mutex_unlock(&p3_dev->buffer_mutex);
 	return ret;
 }
 #endif
 /* possible fops on the p3 device */
 static const struct file_operations spip3_dev_fops = {
 	.owner = THIS_MODULE,
 #ifndef CONFIG_ESE_SECURE
 	.read = spip3_read,
 	.write = spip3_write,
 #endif
 	.open = spip3_open,
 	.release = spip3_release,
 	.unlocked_ioctl = spip3_ioctl,
 #ifdef CONFIG_COMPAT
 	.compat_ioctl = spip3_ioctl,
 #endif
 };

 static int p3_parse_dt(struct device *dev, struct p3_data *data)
 {
 	struct device_node *np = dev->of_node;
 	int ret = 0;

 	data->cs_gpio = of_get_named_gpio(np, "ese_p3,cs-gpio", 0);
 	P3_INFO_MSG("cs-gpio : %d\n:", data->cs_gpio);

 	if (of_property_read_string(np, "p3-vdd-1p8",
 		&data->vdd_1p8) < 0) {
 		P3_ERR_MSG("%s - getting vdd_1p8 error\n", __func__);
 		data->vdd_1p8 = NULL;
 		data->vdd_1p8_gpio = of_get_named_gpio(np, "p3-vdd_1p8-gpio", 0);
 		if (gpio_is_valid(data->vdd_1p8_gpio)) {
 			P3_INFO_MSG("%s success vdd-gpio:%d\n", __func__, data->vdd_1p8_gpio);
 		} else {
 			data->vdd_1p8_gpio = 0;
 		}
 	} else {
 		P3_INFO_MSG("%s success vdd:%s\n", __func__, data->vdd_1p8);
 	}
 	return ret;
 }

 static int spip3_probe(struct spi_device *spi)
 {
 	int ret = -1;
 	struct p3_data *data = NULL;

 	P3_INFO_MSG("%s chip select : %d , bus number = %d\n",
 		__func__, spi->chip_select, spi->master->bus_num);

 #ifdef CONFIG_ESE_SECURE
 	if (p3_suspend() == EBUSY) {
 		P3_ERR_MSG("eSE spi Secure fail!\n");
 		return -EBUSY;
 	}
 #endif

 	data = kzalloc(sizeof(*data), GFP_KERNEL);
 	if (data == NULL) {
 		P3_ERR_MSG("failed to allocate memory for module data\n");
 		ret = -ENOMEM;
 		goto err_exit;
 	}

 	ret = p3_parse_dt(&spi->dev, data);
 	if (ret) {
 		P3_ERR_MSG("%s - Failed to parse DT\n", __func__);
 		goto p3_parse_dt_failed;
 	}

 	ret = p3_regulator_onoff(data, 1);
 	if (ret) {
 		P3_ERR_MSG("%s - Failed to enable regulator\n", __func__);
 		goto p3_parse_dt_failed;
 	}

 #ifdef CONFIG_ESE_SECURE
 	ret = p3_clk_setup(&spi->dev, data);
 	if (ret) {
 		P3_ERR_MSG("%s - Failed to do clk_setup\n", __func__);
 		goto p3_parse_dt_failed;
 	}
 #else
 	spi->bits_per_word = 8;
 	spi->mode = SPI_MODE_0;
 	spi->max_speed_hz = SPI_DEFAULT_SPEED;
 	ret = spi_setup(spi);
 	if (ret < 0) {
 		P3_ERR_MSG("failed to do spi_setup()\n");
 		goto p3_parse_dt_failed;
 	}
 #endif
 	data->speed = SPI_DEFAULT_SPEED;
 	data->spi = spi;
 	data->p3_device.minor = MISC_DYNAMIC_MINOR;
 	data->p3_device.name = "p3";
 	data->p3_device.fops = &spip3_dev_fops;
 	data->p3_device.parent = &spi->dev;

 	dev_set_drvdata(&spi->dev, data);

 	/* init mutex and queues */
 	init_waitqueue_head(&data->read_wq);
 	mutex_init(&data->buffer_mutex);
 #ifdef FEATURE_ESE_WAKELOCK
 	wake_lock_init(&data->ese_lock,
 		WAKE_LOCK_SUSPEND, "ese_wake_lock");
 #endif

 	data->device_opened = false;

 	ret = misc_register(&data->p3_device);
 	if (ret < 0) {
 		P3_ERR_MSG("misc_register failed! %d\n", ret);
 		goto err_misc_regi;
 	}

 	ret = gpio_request(data->cs_gpio, "ese_cs");
 	if (ret)
 		P3_ERR_MSG("failed to get gpio cs-gpio\n");

 #ifdef FEATURE_ESE_POWER_ON_OFF
 	ret = p3_regulator_onoff(data, 0);
 	if (ret < 0) {
 		P3_ERR_MSG("%s failed to turn off LDO. [%d]\n", __func__, ret);
 		goto err_ldo_off;
 	}
 #endif
 #ifdef CONFIG_ESE_SECURE
 	p3_suspend();
 #else
 	p3_pinctrl_config(data, false);
 #endif

 	P3_INFO_MSG("%s finished...\n", __func__);
 	return ret;

 #ifdef FEATURE_ESE_POWER_ON_OFF
 err_ldo_off:
 	misc_deregister(&data->p3_device);
 #endif
 err_misc_regi:
 #ifdef FEATURE_ESE_WAKELOCK
 	wake_lock_destroy(&data->ese_lock);
 #endif
 	mutex_destroy(&data->buffer_mutex);
 p3_parse_dt_failed:
 	kfree(data);
 err_exit:
 	P3_DBG_MSG("ERROR: Exit : %s ret %d\n", __func__, ret);
 	return ret;
 }

 static int spip3_remove(struct spi_device *spi)
 {
 	struct p3_data *p3_dev = dev_get_drvdata(&spi->dev);

 	P3_DBG_MSG("Entry : %s\n", __func__);
 	if (p3_dev == NULL) {
 		P3_ERR_MSG("%s p3_dev is null!\n", __func__);
 		return 0;
 	}

 #ifdef FEATURE_ESE_WAKELOCK
 	wake_lock_destroy(&p3_dev->ese_lock);
 #endif
 	mutex_destroy(&p3_dev->buffer_mutex);
 	misc_deregister(&p3_dev->p3_device);

 	kfree(p3_dev);
 	P3_DBG_MSG("Exit : %s\n", __func__);
 	return 0;
 }

 #ifdef CONFIG_OF
 static const struct of_device_id p3_match_table[] = {
 	{ .compatible = "ese_p3",},
 	{},
 };
 #else
 #define ese_match_table NULL
 #endif

 static struct spi_driver spip3_driver = {
 	.driver = {
 		.name = "p3",
 		.bus = &spi_bus_type,
 		.owner = THIS_MODULE,
 #ifdef CONFIG_OF
 		.of_match_table = p3_match_table,
 #endif
 	},
 	.probe =  spip3_probe,
 	.remove = spip3_remove,
 };

 static int __init spip3_dev_init(void)
 {
 	debug_level = P3_FULL_DEBUG;

 	P3_INFO_MSG("Entry : %s\n", __func__);
 #if (!defined(CONFIG_ESE_FACTORY_ONLY) || defined(CONFIG_SEC_FACTORY))
 	return spi_register_driver(&spip3_driver);
 #else
 	return -1;
 #endif
 }

 static void __exit spip3_dev_exit(void)
 {
 	P3_INFO_MSG("Entry : %s\n", __func__);
 	spi_unregister_driver(&spip3_driver);
 }

 module_init(spip3_dev_init);
 module_exit(spip3_dev_exit);

 MODULE_AUTHOR("Sec");
 MODULE_DESCRIPTION("ese SPI driver");
 MODULE_LICENSE("GPL");

 /** @} */
	/*
	* Copyright (C) 2015 Samsung Electronics. 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 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;
	*
	*/

	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/fs.h>
	#include <linux/slab.h>
	#include <linux/init.h>
	#include <linux/device.h>
	#include <linux/list.h>
	#include <linux/irq.h>
	#include <linux/jiffies.h>
	#include <linux/uaccess.h>
	#include <linux/delay.h>
	#include <linux/interrupt.h>
	#include <linux/io.h>
	#include <linux/platform_device.h>
	#include <linux/gpio.h>
	#include <linux/miscdevice.h>
	#include <linux/spinlock.h>
	#include <linux/spi/spi.h>
	#include <linux/sched.h>
	#include <linux/poll.h>
	#include <linux/regulator/consumer.h>
	#include <linux/ioctl.h>
	#ifdef CONFIG_OF
	#include <linux/of_gpio.h>
	#endif

	#include <linux/platform_data/spi-s3c64xx.h>
	#include <linux/pm_runtime.h>
	#include <linux/spi/spidev.h>
	#include <linux/clk.h>
	#include <linux/wakelock.h>
	#include <linux/smc.h>

	#include "ese_p3.h"

	/* Undef if want to keep eSE Power LDO ALWAYS ON */
	#define FEATURE_ESE_POWER_ON_OFF

	#define SPI_DEFAULT_SPEED 6500000L

	/* size of maximum read/write buffer supported by driver */
	#define MAX_BUFFER_SIZE 260U

	/* Different driver debug lever */
	enum P3_DEBUG_LEVEL {
	P3_DEBUG_OFF,
	P3_FULL_DEBUG
	};

	/* Variable to store current debug level request by ioctl */
	static unsigned char debug_level = P3_FULL_DEBUG;

	#define P3_DBG_MSG(msg...) do { \
	switch (debug_level) { \
	case P3_DEBUG_OFF: \
	break; \
	case P3_FULL_DEBUG: \
	pr_info("[ESE-P3] : " msg); \
	break; \
	/fallthrough/ \
	default: \
	pr_err("[ESE-P3] : debug level %d", debug_level);\
	break; \
	}; \
	} while (0)

	#define P3_ERR_MSG(msg...) pr_err("[ESE-P3] : " msg)
	#define P3_INFO_MSG(msg...) pr_info("[ESE-P3] : " msg)

	static DEFINE_MUTEX(device_list_lock);

	/* Device specific macro and structure */
	struct p3_data {
	wait_queue_head_t read_wq; /* wait queue for read interrupt */
	struct mutex buffer_mutex; /* buffer mutex */
	struct spi_device spi; / spi device structure */
	struct miscdevice p3_device; /* char device as misc driver */

	unsigned int users;

	bool device_opened;
	#ifdef FEATURE_ESE_WAKELOCK
	struct wake_lock ese_lock;
	#endif
	int cs_gpio;
	unsigned long speed;
	const char *vdd_1p8;
	int vdd_1p8_gpio;
	#ifdef CONFIG_ESE_SECURE
	struct clk *ese_spi_pclk;
	struct clk *ese_spi_sclk;
	#endif
	};

	#ifndef CONFIG_ESE_SECURE
	static void p3_pinctrl_config(struct p3_data *data, bool onoff)
	{
	struct spi_device *spi = data->spi;
	struct device *spi_dev = spi->dev.parent->parent;
	struct pinctrl *pinctrl = NULL;

	P3_INFO_MSG("%s: pinctrol - %s\n", __func__, onoff ? "on" : "off");

	if (onoff) {
	/* ON */
	pinctrl = devm_pinctrl_get_select(spi_dev, "ese_active");
	if (IS_ERR_OR_NULL(pinctrl))
	P3_ERR_MSG("%s: Failed to configure ese pin\n", __func__);
	else
	devm_pinctrl_put(pinctrl);
	} else {
	/* OFF */
	pinctrl = devm_pinctrl_get_select(spi_dev, "ese_suspend");
	if (IS_ERR_OR_NULL(pinctrl))
	P3_ERR_MSG("%s: Failed to configure ese pin\n", __func__);
	else
	devm_pinctrl_put(pinctrl);
	}
	}
	#endif

	#ifdef CONFIG_ESE_SECURE
	static int p3_suspend(void)
	{
	u64 r0 = 0, r1 = 0, r2 = 0, r3 = 0;
	int ret = 0;

	r0 = (0x83000032);
	ret = exynos_smc(r0, r1, r2, r3);

	if (ret)
	P3_ERR_MSG("P3 check suspend status! 0x%X\n", ret);

	return ret;
	}

	static int p3_resume(void)
	{
	u64 r0 = 0, r1 = 0, r2 = 0, r3 = 0;
	int ret = 0;

	r0 = (0x83000033);
	ret = exynos_smc(r0, r1, r2, r3);

	if (ret)
	P3_ERR_MSG("P3 check resume status! 0x%X\n", ret);

	return ret;
	}

	static int p3_clk_control(struct p3_data *data, bool onoff)
	{
	static bool old_value;

	if (old_value == onoff)
	return 0;

	if (onoff == true) {
	clk_prepare_enable(data->ese_spi_pclk);
	clk_prepare_enable(data->ese_spi_sclk);

	/* There is a quarter-multiplier before the USI_v2 SPI */
	clk_set_rate(data->ese_spi_sclk, data->speed * 4);
	usleep_range(5000, 5100);
	P3_DBG_MSG("%s clock:%lu\n", __func__, clk_get_rate(data->ese_spi_sclk));
	} else {
	clk_disable_unprepare(data->ese_spi_pclk);
	clk_disable_unprepare(data->ese_spi_sclk);
	}

	old_value = onoff;

	P3_INFO_MSG("clock %s\n", onoff ? "enabled" : "disabled");
	return 0;
	}

	static int p3_clk_setup(struct device dev, struct p3_data data)
	{
	data->ese_spi_pclk = clk_get(dev, "pclk");
	if (IS_ERR(data->ese_spi_pclk)) {
	P3_ERR_MSG("Can't get %s\n", "pclk");
	data->ese_spi_pclk = NULL;
	goto err_pclk_get;
	}

	data->ese_spi_sclk = clk_get(dev, "sclk");
	if (IS_ERR(data->ese_spi_sclk)) {
	P3_ERR_MSG("Can't get %s\n", "sclk");
	data->ese_spi_sclk = NULL;
	goto err_sclk_get;
	}

	return 0;
	err_sclk_get:
	clk_put(data->ese_spi_pclk);
	err_pclk_get:
	return -EPERM;
	}
	#endif

	static int p3_ldo_onoff(struct p3_data *data, int onoff)
	{
	int ret = 0;

	ret = gpio_request(data->vdd_1p8_gpio, "ese_vdd_1p8_gpio");
	if (ret) {
	P3_ERR_MSG("%s - failed to request ese_vdd_1p8_gpio\n", __func__);
	return -EINVAL;
	}
	ret = gpio_direction_output(data->vdd_1p8_gpio, onoff);
	if (ret) {
	P3_ERR_MSG("%s - failed to direction_output ese_vdd_1p8_gpio\n", __func__);
	} else {
	P3_INFO_MSG("%s: use external LDO %d\n", __func__, onoff);
	}
	gpio_free(data->vdd_1p8_gpio);

	return ret;
	}

	static int p3_regulator_onoff(struct p3_data *data, int onoff)
	{
	int rc = 0;
	struct regulator *regulator_vdd_1p8;

	if (!data->vdd_1p8) {
	if (data->vdd_1p8_gpio) {
	rc = p3_ldo_onoff(data, onoff);
	msleep(10);
	return rc;
	} else {
	P3_ERR_MSG("%s No vdd LDO name!\n", __func__);
	return -ENODEV;
	}
	}

	regulator_vdd_1p8 = regulator_get(NULL, data->vdd_1p8);
	pr_err("%s %s\n", __func__, data->vdd_1p8);

	if (IS_ERR(regulator_vdd_1p8) \|\| regulator_vdd_1p8 == NULL) {
	P3_ERR_MSG("%s - vdd_1p8 regulator_get fail\n", __func__);
	return -ENODEV;
	}

	P3_DBG_MSG("%s - onoff = %d\n", __func__, onoff);
	if (onoff == 1) {
	rc = regulator_enable(regulator_vdd_1p8);
	if (rc) {
	P3_ERR_MSG("%s - enable vdd_1p8 failed, rc=%d\n",
	__func__, rc);
	goto done;
	}
	msleep(20);
	} else {
	rc = regulator_disable(regulator_vdd_1p8);
	if (rc) {
	P3_ERR_MSG("%s - disable vdd_1p8 failed, rc=%d\n",
	__func__, rc);
	goto done;
	}
	}

	/data->regulator_is_enable = (u8)onoff;/

	done:
	regulator_put(regulator_vdd_1p8);

	return rc;
	}

	#ifndef CONFIG_ESE_SECURE
	static int p3_xfer(struct p3_data p3_device, struct p3_ioctl_transfer tr)
	{
	int status = 0;
	struct spi_message m;
	struct spi_transfer t;
	unsigned char tx_buffer[MAX_BUFFER_SIZE] = {0x0, };
	unsigned char rx_buffer[MAX_BUFFER_SIZE] = {0x0, };

	P3_DBG_MSG("%s\n", __func__);

	if (p3_device == NULL \|\| tr == NULL)
	return -EFAULT;

	if (tr->len > MAX_BUFFER_SIZE \|\| !tr->len) {
	P3_ERR_MSG("%s invalid size\n", __func__);
	return -EMSGSIZE;
	}

	if (tr->tx_buffer != NULL) {
	if (copy_from_user(tx_buffer,
	tr->tx_buffer, tr->len) != 0)
	return -EFAULT;
	}

	spi_message_init(&m);
	memset(&t, 0, sizeof(t));

	t.tx_buf = tx_buffer;
	t.rx_buf = rx_buffer;
	t.len = tr->len;

	spi_message_add_tail(&t, &m);

	status = spi_sync(p3_device->spi, &m);
	if (status == 0) {
	if (tr->rx_buffer != NULL) {
	unsigned int missing = 0;

	missing = (unsigned int)copy_to_user(tr->rx_buffer,
	rx_buffer, tr->len);

	if (missing != 0)
	tr->len = tr->len - missing;
	}
	}
	pr_debug("%s, length=%d\n", __func__, tr->len);
	return status;

	} /* vfsspi_xfer */

	static int p3_rw_spi_message(struct p3_data *p3_device,
	unsigned long arg)
	{
	struct p3_ioctl_transfer *dup = NULL;
	int err = 0;

	dup = kmalloc(sizeof(struct p3_ioctl_transfer), GFP_KERNEL);
	if (dup == NULL)
	return -ENOMEM;

	if (copy_from_user(dup, (void *)arg,
	sizeof(struct p3_ioctl_transfer)) != 0) {
	kfree(dup);
	return -EFAULT;
	}

	err = p3_xfer(p3_device, dup);
	if (err != 0) {
	kfree(dup);
	P3_ERR_MSG("%s xfer failed!\n", __func__);
	return err;
	}

	/P3_ERR_MSG("%s len:%u\n", __func__, dup->len);/
	if (copy_to_user((void *)arg, dup,
	sizeof(struct p3_ioctl_transfer)) != 0)
	return -EFAULT;
	kfree(dup);
	return 0;
	}

	#if 0 //def CONFIG_COMPAT
	static int p3_rw_spi_message_32(struct p3_data *p3_device, unsigned long arg)
	{
	struct p3_ioctl_transfer dup;
	struct spip3_ioc_transfer_32 p3transfr_32;
	int err = 0;

	if (__copy_from_user(&p3transfr_32, (void __user *)arg,
	sizeof(struct spip3_ioc_transfer_32))) {
	P3_ERR_MSG("%s, failed to copy from user\n", __func__);
	return -EFAULT;
	}

	dup.tx_buffer = (unsigned char *)(unsigned long)(p3transfr_32.tx_buffer);
	dup.rx_buffer = (unsigned char *)(unsigned long)(p3transfr_32.rx_buffer);
	dup.len = p3transfr_32.len;

	err = p3_xfer(p3_device, &dup);
	if (err != 0) {
	P3_ERR_MSG("%s xfer failed!\n", __func__);
	return err;
	}
	P3_DBG_MSG("%s len:%u\n", __func__, dup.len);

	return 0;
	}
	#endif
	#endif

	static int spip3_open(struct inode inode, struct file filp)
	{
	struct p3_data *p3_dev = container_of(filp->private_data,
	struct p3_data, p3_device);
	int ret = 0;

	/* for defence MULTI-OPEN */
	if (p3_dev->device_opened) {
	P3_ERR_MSG("%s - ALREADY opened!\n", __func__);
	return -EBUSY;
	}

	mutex_lock(&device_list_lock);
	p3_dev->device_opened = true;
	P3_INFO_MSG("open\n");

	#ifdef FEATURE_ESE_WAKELOCK
	wake_lock(&p3_dev->ese_lock);
	#endif

	#ifdef CONFIG_ESE_SECURE
	p3_clk_control(p3_dev, true);
	p3_resume();
	#else
	p3_pinctrl_config(p3_dev, true);
	#endif

	#ifdef FEATURE_ESE_POWER_ON_OFF
	ret = p3_regulator_onoff(p3_dev, 1);
	if (ret < 0)
	P3_ERR_MSG(" %s : failed to turn on LDO()\n", __func__);
	usleep_range(2000, 2500);
	#endif

	filp->private_data = p3_dev;

	p3_dev->users++;
	mutex_unlock(&device_list_lock);

	return 0;
	}

	static int spip3_release(struct inode inode, struct file filp)
	{
	struct p3_data *p3_dev = filp->private_data;
	int ret = 0;

	if (!p3_dev->device_opened) {
	P3_ERR_MSG("%s - was NOT opened....\n", __func__);
	return 0;
	}

	mutex_lock(&device_list_lock);

	#ifdef FEATURE_ESE_WAKELOCK
	if (wake_lock_active(&p3_dev->ese_lock))
	wake_unlock(&p3_dev->ese_lock);
	#endif

	filp->private_data = p3_dev;

	p3_dev->users--;
	if (!p3_dev->users) {
	p3_dev->device_opened = false;

	#ifdef CONFIG_ESE_SECURE
	p3_clk_control(p3_dev, false);
	p3_suspend();
	usleep_range(1000, 1500);
	#else
	p3_pinctrl_config(p3_dev, false);
	#endif
	#ifdef FEATURE_ESE_POWER_ON_OFF
	ret = p3_regulator_onoff(p3_dev, 0);
	if (ret < 0)
	P3_ERR_MSG(" test: failed to turn off LDO()\n");

	#endif
	}
	mutex_unlock(&device_list_lock);

	P3_DBG_MSG("%s, users:%d, Major Minor No:%d %d\n", __func__,
	p3_dev->users, imajor(inode), iminor(inode));
	return 0;
	}

	static long spip3_ioctl(struct file *filp, unsigned int cmd,
	unsigned long arg)
	{
	int ret = 0;
	struct p3_data *data = NULL;

	if (_IOC_TYPE(cmd) != P3_MAGIC) {
	P3_ERR_MSG("%s invalid magic. cmd=0x%X Received=0x%X Expected=0x%X\n",
	__func__, cmd, _IOC_TYPE(cmd), P3_MAGIC);
	return -ENOTTY;
	}

	data = filp->private_data;

	mutex_lock(&data->buffer_mutex);
	switch (cmd) {
	case P3_SET_DBG:
	debug_level = (unsigned char)arg;
	P3_DBG_MSG(KERN_INFO"[NXP-P3] - Debug level %d", debug_level);
	break;
	case P3_ENABLE_SPI_CLK:
	P3_DBG_MSG("%s P3_ENABLE_SPI_CLK\n", __func__);
	#ifdef CONFIG_ESE_SECURE
	ret = p3_clk_control(data, true);
	if (ret < 0)
	P3_ERR_MSG("%s: Unable to enable spi clk\n", __func__);
	#endif
	break;
	case P3_DISABLE_SPI_CLK:
	P3_DBG_MSG("%s P3_DISABLE_SPI_CLK\n", __func__);
	#ifdef CONFIG_ESE_SECURE
	ret = p3_clk_control(data, false);
	if (ret < 0)
	P3_ERR_MSG("%s: couldn't disable spi clks\n", __func__);
	#endif
	break;
	#ifndef CONFIG_ESE_SECURE
	case P3_RW_SPI_DATA:
	ret = p3_rw_spi_message(data, arg);
	if (ret < 0)
	P3_ERR_MSG("%s P3_RW_SPI_DATA failed [%d].\n",
	__func__, ret);
	break;
	#endif
	#if 0 //def CONFIG_COMPAT
	case P3_RW_SPI_DATA_32:
	ret = p3_rw_spi_message_32(data, arg);
	if (ret < 0)
	P3_ERR_MSG("%s P3_RW_SPI_DATA_32 failed [%d].\n",
	__func__, ret);
	break;
	#endif

	case P3_SET_PWR:
	case P3_SET_POLL:
	case P3_SET_SPI_CLK:
	case P3_ENABLE_SPI_CS:
	case P3_DISABLE_SPI_CS:
	case P3_ENABLE_CLK_CS:
	case P3_DISABLE_CLK_CS:
	case P3_SWING_CS:
	P3_ERR_MSG("%s deprecated IOCTL:0x%X\n", __func__, cmd);
	break;

	default:
	P3_DBG_MSG("%s no matching ioctl! 0x%X\n", __func__, cmd);
	ret = -EINVAL;
	}
	mutex_unlock(&data->buffer_mutex);

	return ret;
	}

	#ifndef CONFIG_ESE_SECURE
	static ssize_t spip3_write(struct file filp, const char buf, size_t count,
	loff_t *offset)
	{
	int ret = -1;
	struct p3_data *p3_dev;
	struct spi_message m;
	struct spi_transfer t;
	unsigned char tx_buffer[MAX_BUFFER_SIZE] = {0x0, };
	unsigned char rx_buffer[MAX_BUFFER_SIZE] = {0x0, };

	P3_INFO_MSG("spip3_write -Enter count %zu\n", count);

	p3_dev = filp->private_data;

	if (count > MAX_BUFFER_SIZE) {
	P3_ERR_MSG("%s invalid size\n", __func__);
	return -EMSGSIZE;
	}
	mutex_lock(&p3_dev->buffer_mutex);

	if (copy_from_user(&tx_buffer[0], &buf[0], count)) {
	P3_ERR_MSG("%s : failed to copy from user space\n", __func__);
	mutex_unlock(&p3_dev->buffer_mutex);
	return -EFAULT;
	}

	/* Write data */
	spi_message_init(&m);
	memset(&t, 0, sizeof(t));

	t.tx_buf = tx_buffer;
	t.rx_buf = rx_buffer;
	t.len = count;

	spi_message_add_tail(&t, &m);

	gpio_set_value(p3_dev->cs_gpio, 0);
	ret = spi_sync(p3_dev->spi, &m);
	gpio_set_value(p3_dev->cs_gpio, 1);
	if (ret < 0)
	ret = -EIO;
	else
	ret = count;

	mutex_unlock(&p3_dev->buffer_mutex);
	P3_DBG_MSG(KERN_ALERT "spip3_write ret %d- Exit\n", ret);

	return ret;
	}

	static ssize_t spip3_read(struct file filp, char buf, size_t count,
	loff_t *offset)
	{
	int ret = -EIO;
	struct spi_message m;
	struct spi_transfer t;
	struct p3_data *p3_dev = filp->private_data;
	unsigned char tx_buffer[MAX_BUFFER_SIZE] = {0x0, };
	unsigned char rx_buffer[MAX_BUFFER_SIZE] = {0x0, };

	if (count > MAX_BUFFER_SIZE) {
	P3_ERR_MSG("%s invalid size\n", __func__);
	return -EMSGSIZE;
	}
	P3_INFO_MSG("spip3_read count %zu - Enter\n", count);
	mutex_lock(&p3_dev->buffer_mutex);

	spi_message_init(&m);
	memset(&t, 0, sizeof(t));

	t.tx_buf = tx_buffer;
	t.rx_buf = rx_buffer;
	t.len = count;

	spi_message_add_tail(&t, &m);

	gpio_set_value(p3_dev->cs_gpio, 0);
	ret = spi_sync(p3_dev->spi, &m);
	gpio_set_value(p3_dev->cs_gpio, 1);

	if (copy_to_user(buf, &rx_buffer[0], count)) {
	P3_ERR_MSG("%s : failed to copy to user space\n", __func__);
	ret = -EFAULT;
	goto fail;
	}
	ret = count;
	P3_DBG_MSG("%s ret %d Exit\n", __func__, ret);

	mutex_unlock(&p3_dev->buffer_mutex);

	return ret;

	fail:
	P3_ERR_MSG("Error %s ret %d Exit\n", __func__, ret);
	mutex_unlock(&p3_dev->buffer_mutex);
	return ret;
	}
	#endif
	/* possible fops on the p3 device */
	static const struct file_operations spip3_dev_fops = {
	.owner = THIS_MODULE,
	#ifndef CONFIG_ESE_SECURE
	.read = spip3_read,
	.write = spip3_write,
	#endif
	.open = spip3_open,
	.release = spip3_release,
	.unlocked_ioctl = spip3_ioctl,
	#ifdef CONFIG_COMPAT
	.compat_ioctl = spip3_ioctl,
	#endif
	};

	static int p3_parse_dt(struct device dev, struct p3_data data)
	{
	struct device_node *np = dev->of_node;
	int ret = 0;

	data->cs_gpio = of_get_named_gpio(np, "ese_p3,cs-gpio", 0);
	P3_INFO_MSG("cs-gpio : %d\n:", data->cs_gpio);

	if (of_property_read_string(np, "p3-vdd-1p8",
	&data->vdd_1p8) < 0) {
	P3_ERR_MSG("%s - getting vdd_1p8 error\n", __func__);
	data->vdd_1p8 = NULL;
	data->vdd_1p8_gpio = of_get_named_gpio(np, "p3-vdd_1p8-gpio", 0);
	if (gpio_is_valid(data->vdd_1p8_gpio)) {
	P3_INFO_MSG("%s success vdd-gpio:%d\n", __func__, data->vdd_1p8_gpio);
	} else {
	data->vdd_1p8_gpio = 0;
	}
	} else {
	P3_INFO_MSG("%s success vdd:%s\n", __func__, data->vdd_1p8);
	}
	return ret;
	}

	static int spip3_probe(struct spi_device *spi)
	{
	int ret = -1;
	struct p3_data *data = NULL;

	P3_INFO_MSG("%s chip select : %d , bus number = %d\n",
	__func__, spi->chip_select, spi->master->bus_num);

	#ifdef CONFIG_ESE_SECURE
	if (p3_suspend() == EBUSY) {
	P3_ERR_MSG("eSE spi Secure fail!\n");
	return -EBUSY;
	}
	#endif

	data = kzalloc(sizeof(*data), GFP_KERNEL);
	if (data == NULL) {
	P3_ERR_MSG("failed to allocate memory for module data\n");
	ret = -ENOMEM;
	goto err_exit;
	}

	ret = p3_parse_dt(&spi->dev, data);
	if (ret) {
	P3_ERR_MSG("%s - Failed to parse DT\n", __func__);
	goto p3_parse_dt_failed;
	}

	ret = p3_regulator_onoff(data, 1);
	if (ret) {
	P3_ERR_MSG("%s - Failed to enable regulator\n", __func__);
	goto p3_parse_dt_failed;
	}

	#ifdef CONFIG_ESE_SECURE
	ret = p3_clk_setup(&spi->dev, data);
	if (ret) {
	P3_ERR_MSG("%s - Failed to do clk_setup\n", __func__);
	goto p3_parse_dt_failed;
	}
	#else
	spi->bits_per_word = 8;
	spi->mode = SPI_MODE_0;
	spi->max_speed_hz = SPI_DEFAULT_SPEED;
	ret = spi_setup(spi);
	if (ret < 0) {
	P3_ERR_MSG("failed to do spi_setup()\n");
	goto p3_parse_dt_failed;
	}
	#endif
	data->speed = SPI_DEFAULT_SPEED;
	data->spi = spi;
	data->p3_device.minor = MISC_DYNAMIC_MINOR;
	data->p3_device.name = "p3";
	data->p3_device.fops = &spip3_dev_fops;
	data->p3_device.parent = &spi->dev;

	dev_set_drvdata(&spi->dev, data);

	/* init mutex and queues */
	init_waitqueue_head(&data->read_wq);
	mutex_init(&data->buffer_mutex);
	#ifdef FEATURE_ESE_WAKELOCK
	wake_lock_init(&data->ese_lock,
	WAKE_LOCK_SUSPEND, "ese_wake_lock");
	#endif

	data->device_opened = false;

	ret = misc_register(&data->p3_device);
	if (ret < 0) {
	P3_ERR_MSG("misc_register failed! %d\n", ret);
	goto err_misc_regi;
	}

	ret = gpio_request(data->cs_gpio, "ese_cs");
	if (ret)
	P3_ERR_MSG("failed to get gpio cs-gpio\n");

	#ifdef FEATURE_ESE_POWER_ON_OFF
	ret = p3_regulator_onoff(data, 0);
	if (ret < 0) {
	P3_ERR_MSG("%s failed to turn off LDO. [%d]\n", __func__, ret);
	goto err_ldo_off;
	}
	#endif
	#ifdef CONFIG_ESE_SECURE
	p3_suspend();
	#else
	p3_pinctrl_config(data, false);
	#endif

	P3_INFO_MSG("%s finished...\n", __func__);
	return ret;

	#ifdef FEATURE_ESE_POWER_ON_OFF
	err_ldo_off:
	misc_deregister(&data->p3_device);
	#endif
	err_misc_regi:
	#ifdef FEATURE_ESE_WAKELOCK
	wake_lock_destroy(&data->ese_lock);
	#endif
	mutex_destroy(&data->buffer_mutex);
	p3_parse_dt_failed:
	kfree(data);
	err_exit:
	P3_DBG_MSG("ERROR: Exit : %s ret %d\n", __func__, ret);
	return ret;
	}

	static int spip3_remove(struct spi_device *spi)
	{
	struct p3_data *p3_dev = dev_get_drvdata(&spi->dev);

	P3_DBG_MSG("Entry : %s\n", __func__);
	if (p3_dev == NULL) {
	P3_ERR_MSG("%s p3_dev is null!\n", __func__);
	return 0;
	}

	#ifdef FEATURE_ESE_WAKELOCK
	wake_lock_destroy(&p3_dev->ese_lock);
	#endif
	mutex_destroy(&p3_dev->buffer_mutex);
	misc_deregister(&p3_dev->p3_device);

	kfree(p3_dev);
	P3_DBG_MSG("Exit : %s\n", __func__);
	return 0;
	}

	#ifdef CONFIG_OF
	static const struct of_device_id p3_match_table[] = {
	{ .compatible = "ese_p3",},
	{},
	};
	#else
	#define ese_match_table NULL
	#endif

	static struct spi_driver spip3_driver = {
	.driver = {
	.name = "p3",
	.bus = &spi_bus_type,
	.owner = THIS_MODULE,
	#ifdef CONFIG_OF
	.of_match_table = p3_match_table,
	#endif
	},
	.probe = spip3_probe,
	.remove = spip3_remove,
	};

	static int __init spip3_dev_init(void)
	{
	debug_level = P3_FULL_DEBUG;

	P3_INFO_MSG("Entry : %s\n", __func__);
	#if (!defined(CONFIG_ESE_FACTORY_ONLY) \|\| defined(CONFIG_SEC_FACTORY))
	return spi_register_driver(&spip3_driver);
	#else
	return -1;
	#endif
	}

	static void __exit spip3_dev_exit(void)
	{
	P3_INFO_MSG("Entry : %s\n", __func__);
	spi_unregister_driver(&spip3_driver);
	}

	module_init(spip3_dev_init);
	module_exit(spip3_dev_exit);

	MODULE_AUTHOR("Sec");
	MODULE_DESCRIPTION("ese SPI driver");
	MODULE_LICENSE("GPL");

	/** @} */