kernel_samsung_a53x/drivers/leds/leds-s2mu106.c

/*
 * leds-s2mu106.c - LED class driver for S2MU106 FLASH LEDs.
 *
 * Copyright (C) 2018 Samsung Electronics
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
#include <linux/gpio.h>
#include <linux/of_gpio.h>
#include <linux/mfd/samsung/s2mu106.h>
#include <linux/leds-s2mu106.h>
#include <linux/platform_device.h>

#define CONTROL_I2C	0
#define CONTROL_GPIO	1

struct s2mu106_fled_data *g_fled_data;
extern struct class *camera_class; /*sys/class/camera*/

static char *s2mu106_fled_mode_string[] = {
	"OFF",
	"TORCH",
	"FLASH",
};

static char *s2mu106_fled_operating_mode_string[] = {
	"AUTO",
	"BOOST",
	"TA",
	"SYS",
};

/* IC current limit */
static int s2mu106_fled_torch_curr_max[] = {
	0, 320, 320, 320
};

/* IC current limit */
static int s2mu106_fled_flash_curr_max[] = {
	0, 1600, 1600, 500
};

#if IS_ENABLED(DEBUG_TEST_READ)
static void s2mu106_fled_test_read(struct s2mu106_fled_data *fled)
{
	u8 data;
	char str[1016] = {0,};
	int i;
	struct i2c_client *i2c = fled->i2c;

	for (i = 0x0B; i <= 0x0C; i++) {
		s2mu106_read_reg(i2c, i, &data);
		sprintf(str+strlen(str), "0x%02x:0x%02x, ", i, data);
	}
	for (i = 0x14; i <= 0x15; i++) {
		s2mu106_read_reg(i2c, i, &data);
		sprintf(str+strlen(str), "0x%02x:0x%02x, ", i, data);
	}

	for (i = 0x53; i <= 0x5A; i++) {
		s2mu106_read_reg(i2c, i, &data);
		sprintf(str+strlen(str), "0x%02x:0x%02x, ", i, data);
	}

	s2mu106_read_reg(i2c, 0x5B, &data);
	pr_err("%s: %s0x5B:0x%02x\n", __func__, str, data);

	memset(str, 0, strlen(str));

	for (i = 0x5C; i <= 0x62; i++) {
		s2mu106_read_reg(i2c, i, &data);
		sprintf(str+strlen(str), "0x%02x:0x%02x, ", i, data);
	}

	s2mu106_read_reg(i2c, 0x63, &data);
	pr_err("%s: %s0x63:0x%02x\n", __func__, str, data);
}
#endif

static int s2mu106_fled_get_flash_curr(struct s2mu106_fled_data *fled, int chan)
{
	int curr = -1;
	u8 data;
	u8 dest;

	if ((chan < 1) || (chan > S2MU106_CH_MAX)) {
		pr_info("%s: Wrong channel!!\n", __func__);
		return -1;
	}

	switch (chan) {
	case 1:
		dest = S2MU106_FLED_CH1_CTRL0;
		break;
	case 2:
		dest = S2MU106_FLED_CH2_CTRL0;
		break;
	case 3:
		dest = S2MU106_FLED_CH3_CTRL0;
		break;
	}

	s2mu106_read_reg(fled->i2c, dest, &data);

	data = data & S2MU106_CHX_FLASH_IOUT;
	curr = (data * 50) + 50;

	pr_info("%s: CH%02d flash curr. = %dmA\n", __func__, chan, curr);

	return curr;
}

static int s2mu106_fled_set_flash_curr(struct s2mu106_fled_data *fled, int chan, int curr)
{
	int ret = -1;
	u8 data;
	u8 dest;
	int curr_set;

	if ((chan < 1) || (chan > S2MU106_CH_MAX)) {
		pr_info("%s: Wrong channel!!\n", __func__);
		return -1;
	}

	switch (chan) {
	case 1:
		dest = S2MU106_FLED_CH1_CTRL0;
		break;
	case 2:
		dest = S2MU106_FLED_CH2_CTRL0;
		break;
	case 3:
		dest = S2MU106_FLED_CH3_CTRL0;
		break;
	}

	if (curr < 50)
		curr = 50;
	else if (curr > s2mu106_fled_flash_curr_max[chan])
		curr = s2mu106_fled_flash_curr_max[chan];

	data = (curr - 50)/50;

	s2mu106_update_reg(fled->i2c, dest, data, S2MU106_CHX_FLASH_IOUT);

	curr_set = s2mu106_fled_get_flash_curr(fled, chan);

	pr_info("%s: curr: %d, curr_set: %d\n", __func__, curr, curr_set);

	return ret;
}

static int s2mu106_fled_get_torch_curr(struct s2mu106_fled_data *fled, int chan)
{
	int curr = -1;
	u8 data;
	u8 dest;

	if ((chan < 1) || (chan > S2MU106_CH_MAX)) {
		pr_info("%s: Wrong channel!!\n", __func__);
		return -1;
	}

	switch (chan) {
	case 1:
		dest = S2MU106_FLED_CH1_CTRL1;
		break;
	case 2:
		dest = S2MU106_FLED_CH2_CTRL1;
		break;
	case 3:
		dest = S2MU106_FLED_CH3_CTRL1;
		break;
	}

	s2mu106_read_reg(fled->i2c, dest, &data);

	data = data & S2MU106_CHX_TORCH_IOUT;
	curr = data * 10 + 10;

	pr_info("%s: CH%02d torch curr. = %dmA\n", __func__, chan, curr);

	return curr;
}

static int s2mu106_fled_set_torch_curr(struct s2mu106_fled_data *fled, int chan, int curr)
{
	int ret = -1;
	u8 data;
	u8 dest;
	int curr_set;

	if ((chan < 1) || (chan > S2MU106_CH_MAX)) {
		pr_info("%s: Wrong channel!!\n", __func__);
		return -1;
	}

	switch (chan) {
	case 1:
		dest = S2MU106_FLED_CH1_CTRL1;
		break;
	case 2:
		dest = S2MU106_FLED_CH2_CTRL1;
		break;
	case 3:
		dest = S2MU106_FLED_CH3_CTRL1;
		break;
	}

	if (curr < 10)
		curr = 10;
	else if (curr > s2mu106_fled_torch_curr_max[chan])
		curr = s2mu106_fled_torch_curr_max[chan];

	data = (curr - 10)/10;

	s2mu106_update_reg(fled->i2c, dest, data, S2MU106_CHX_TORCH_IOUT);

	curr_set = s2mu106_fled_get_torch_curr(fled, chan);

	pr_info("%s: curr: %d, curr_set: %d\n", __func__, curr, curr_set);

	ret = 0;

	return ret;

}

static void s2mu106_fled_operating_mode(struct s2mu106_fled_data *fled, int mode)
{
	u8 value;

	if (fled->set_on_factory) {
		pr_info("%s Factory Status, Return\n", __func__);
		return;
	}

	if (mode < 0 || mode > 3) {
		pr_info("%s, wrong mode\n", __func__);
		mode = AUTO_MODE;
	}

	pr_info("%s = %s\n", __func__, s2mu106_fled_operating_mode_string[mode]);

	value = mode << 6;
	s2mu106_update_reg(fled->i2c, S2MU106_FLED_CTRL0, value, 0xC0);
}

static int s2mu106_fled_get_mode(struct s2mu106_fled_data *fled, int chan)
{
	u8 status;
	int ret = -1;

	s2mu106_read_reg(fled->i2c, S2MU106_FLED_STATUS1, &status);

	pr_info("%s: S2MU106_FLED_STATUS1: 0x%02x\n", __func__, status);

	if ((chan < 1) || (chan > S2MU106_CH_MAX)) {
		pr_info("%s: Wrong channel!!\n", __func__);
		return -1;
	}

	switch (chan) {
	case 1:
		if (status & S2MU106_CH1_FLASH_ON)
			ret = S2MU106_FLED_MODE_FLASH;
		else if (status & S2MU106_CH1_TORCH_ON)
			ret = S2MU106_FLED_MODE_TORCH;
		else
			ret = S2MU106_FLED_MODE_OFF;
		break;
	case 2:
		if (status & S2MU106_CH2_FLASH_ON)
			ret = S2MU106_FLED_MODE_FLASH;
		else if (status & S2MU106_CH2_TORCH_ON)
			ret = S2MU106_FLED_MODE_TORCH;
		else
			ret = S2MU106_FLED_MODE_OFF;
		break;
	case 3:
		if (status & S2MU106_CH3_FLASH_ON)
			ret = S2MU106_FLED_MODE_FLASH;
		else if (status & S2MU106_CH3_TORCH_ON)
			ret = S2MU106_FLED_MODE_TORCH;
		else
			ret = S2MU106_FLED_MODE_OFF;
		break;
	}
	return ret;
}

static int s2mu106_fled_set_mode(struct s2mu106_fled_data *fled, int chan, int mode)
{
	u8 dest = 0, bit = 0, mask = 0, status = 0;

	if ((chan <= 0) || (chan > S2MU106_CH_MAX) || (mode < 0) || (mode > S2MU106_FLED_MODE_MAX)) {
		pr_err("%s: Wrong channel or mode.\n", __func__);
		return -EFAULT;
	}

	pr_err("%s: channel: %d, mode: %d\n", __func__, chan, mode);

	/* 0b000: OFF, 0b101: i2c bit control(on) */
	switch (mode) {
	case S2MU106_FLED_MODE_OFF:
		mask = S2MU106_CHX_FLASH_FLED_EN | S2MU106_CHX_TORCH_FLED_EN;
		bit = 0;
		break;
	case S2MU106_FLED_MODE_FLASH:
		mask = S2MU106_CHX_FLASH_FLED_EN;
		bit = S2MU106_FLED_EN << 3;
		break;
	case S2MU106_FLED_MODE_TORCH:
		s2mu106_fled_operating_mode(fled, SYS_MODE);
		mask = S2MU106_CHX_TORCH_FLED_EN;
		bit = S2MU106_FLED_EN;
		break;
	default:
		return -EFAULT;
	}

	switch (chan) {
	case 1:
		dest = S2MU106_FLED_CTRL1;
		break;
	case 2:
		dest = S2MU106_FLED_CTRL2;
		break;
	case 3:
		dest = S2MU106_FLED_CTRL3;
		break;
	}

	/* Need to set EN_FLED_PRE bit before mode change */
	if (mode != S2MU106_FLED_MODE_OFF)
		s2mu106_update_reg(fled->i2c, S2MU106_FLED_CTRL0, S2MU106_EN_FLED_PRE, S2MU106_EN_FLED_PRE);
	else {
		/* If no LED is on, clear EN_FLED_PRE */
		s2mu106_read_reg(fled->i2c, S2MU106_FLED_STATUS1, &status);
		if (!(status & S2MU106_FLED_ON_CHECK))
			s2mu106_update_reg(fled->i2c, S2MU106_FLED_CTRL0, 0, S2MU106_EN_FLED_PRE);
	}
	s2mu106_update_reg(fled->i2c, dest, bit, mask);

	if (mode == S2MU106_FLED_MODE_OFF)
		s2mu106_fled_operating_mode(fled, AUTO_MODE);

	return 0;
}

int s2mu106_mode_change_cam_to_leds(enum cam_flash_mode cam_mode)
{
	int mode = -1;

	switch (cam_mode) {
	case CAM_FLASH_MODE_OFF:
		mode = S2MU106_FLED_MODE_OFF;
		break;
	case CAM_FLASH_MODE_SINGLE:
		mode = S2MU106_FLED_MODE_FLASH;
		break;
	case CAM_FLASH_MODE_TORCH:
		mode = S2MU106_FLED_MODE_TORCH;
		break;
	default:
		mode = S2MU106_FLED_MODE_OFF;
		break;
	}

	return mode;
}

int s2mu106_fled_set_mode_ctrl(int chan, enum cam_flash_mode cam_mode)
{
	struct s2mu106_fled_data *fled = g_fled_data;
	int mode = -1;

	mode = s2mu106_mode_change_cam_to_leds(cam_mode);

	if ((chan <= 0) || (chan > S2MU106_CH_MAX) || (mode < 0) || (mode >= S2MU106_FLED_MODE_MAX)) {
		pr_err("%s: channel: %d, mode: %d\n", __func__, chan, mode);
		pr_err("%s: Wrong channel or mode.\n", __func__);
		return -1;
	}

	s2mu106_fled_set_mode(fled, chan, mode);
#if IS_ENABLED(DEBUG_TEST_READ)
	s2mu106_fled_test_read(fled);
#endif

	return 0;
}
EXPORT_SYMBOL_GPL(s2mu106_fled_set_mode_ctrl);

int s2mu106_fled_set_curr(int chan, enum cam_flash_mode cam_mode)
{
	struct s2mu106_fled_data *fled = g_fled_data;
	int mode = -1;

	mode = s2mu106_mode_change_cam_to_leds(cam_mode);

	/* Check channel */
	if ((chan <= 0) || (chan > S2MU106_CH_MAX)) {
		pr_err("%s: Wrong channel.\n", __func__);
		return -EFAULT;
	}

	switch (mode) {
	case S2MU106_FLED_MODE_TORCH:
		/* Set curr. */
		s2mu106_fled_set_torch_curr(fled, chan, fled->preflash_current);
		break;
	case S2MU106_FLED_MODE_FLASH:
		/* Set curr. */
		s2mu106_fled_set_flash_curr(fled, chan, fled->flash_current);
		break;
	default:
		return -1;
	}
	/* Test read */
#if IS_ENABLED(DEBUG_TEST_READ)
	s2mu106_fled_test_read(fled);
#endif

	return 0;
}
EXPORT_SYMBOL_GPL(s2mu106_fled_set_curr);

int s2mu106_fled_get_curr(int chan, enum cam_flash_mode cam_mode)
{
	struct s2mu106_fled_data *fled = g_fled_data;
	int mode = -1;
	int curr = 0;

	mode = s2mu106_mode_change_cam_to_leds(cam_mode);

	/* Check channel */
	if ((chan <= 0) || (chan > S2MU106_CH_MAX)) {
		pr_err("%s: Wrong channel.\n", __func__);
		return -EFAULT;
	}

	switch (mode) {
	case S2MU106_FLED_MODE_TORCH:
		curr = s2mu106_fled_get_torch_curr(fled, chan);
		break;
	case S2MU106_FLED_MODE_FLASH:
		curr = s2mu106_fled_get_flash_curr(fled, chan);
		break;
	default:
		return -1;
	}
	/* Test read */
#if IS_ENABLED(DEBUG_TEST_READ)
	s2mu106_fled_test_read(fled);
#endif

	return curr;
}

static ssize_t fled_flash_curr_show(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	struct s2mu106_fled_data *fled = container_of(led_cdev, struct s2mu106_fled_data, cdev);
	int cnt = 0;
	int curr = 0;
	int i;
	char str[1016] = {0,};

	/* Read curr. */
	for (i = 1; i <= S2MU106_CH_MAX; i++) {
		curr = s2mu106_fled_get_flash_curr(fled, i);
		pr_info("%s: channel: %d, curr: %dmA\n", __func__, i, curr);
		if (curr >= 0)
			cnt += sprintf(str+strlen(str), "CH%02d: %dmA, ", i, curr);
	}

	cnt += sprintf(str+strlen(str), "\n");

	strcpy(buf, str);

	return cnt;
}

static ssize_t fled_flash_curr_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t size)
{
	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	struct s2mu106_fled_data *fled = container_of(led_cdev, struct s2mu106_fled_data, cdev);
	int chan = -1;
	int curr = -1;
	int ret = 0;

	ret = sscanf(buf, "%d %d", &chan, &curr);
	if (ret != 2)
		pr_err("%s: sscanf fail\n", __func__);

	/* Check channel */
	if ((chan <= 0) || (chan > S2MU106_CH_MAX)) {
		pr_err("%s: Wrong channel.\n", __func__);
		return -EFAULT;
	}

	/* Set curr. */
	s2mu106_fled_set_flash_curr(fled, chan, curr);

	/* Test read */
#if IS_ENABLED(DEBUG_TEST_READ)
	s2mu106_fled_test_read(fled);
#endif

	return size;
}


static ssize_t fled_torch_curr_show(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	struct s2mu106_fled_data *fled = container_of(led_cdev, struct s2mu106_fled_data, cdev);
	int cnt = 0;
	int curr = 0;
	int i;
	char str[1016] = {0,};

	/* Read curr. */
	for (i = 1; i <= S2MU106_CH_MAX; i++) {
		curr = s2mu106_fled_get_torch_curr(fled, i);
		pr_info("%s: channel: %d, curr: %dmA\n", __func__, i, curr);
		if (curr >= 0)
			cnt += sprintf(str+strlen(str), "CH%02d: %dmA, ", i, curr);
	}

	cnt += sprintf(str+strlen(str), "\n");

	strcpy(buf, str);

	return cnt;
}

static ssize_t fled_torch_curr_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t size)
{
	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	struct s2mu106_fled_data *fled = container_of(led_cdev, struct s2mu106_fled_data, cdev);
	int chan = -1;
	int curr = -1;
	int ret = 0;

	ret = sscanf(buf, "%d %d", &chan, &curr);
	if (ret != 2)
		pr_err("%s: sscanf fail\n", __func__);

	/* Check channel */
	if ((chan <= 0) || (chan > S2MU106_CH_MAX)) {
		pr_err("%s: Wrong channel.\n", __func__);
		return -EFAULT;
	}

	/* Set curr. */
	s2mu106_fled_set_torch_curr(fled, chan, curr);

	/* Test read */
#if IS_ENABLED(DEBUG_TEST_READ)
	s2mu106_fled_test_read(fled);
#endif

	return size;
}

static ssize_t fled_mode_show(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	struct s2mu106_fled_data *fled = container_of(led_cdev, struct s2mu106_fled_data, cdev);
	int cnt = 0;
	int mode = 0;
	int i;
	char str[1016] = {0,};

#if IS_ENABLED(DEBUG_TEST_READ)
	s2mu106_fled_test_read(fled);
#endif

	for (i = 1; i <= S2MU106_CH_MAX; i++) {
		mode = s2mu106_fled_get_mode(fled, i);
		if (mode >= 0)
			cnt += sprintf(str+strlen(str), "CH%02d: %s, ", i, s2mu106_fled_mode_string[mode]);
	}

	cnt += sprintf(str+strlen(str), "\n");

	strcpy(buf, str);

	return cnt;
}

static ssize_t fled_mode_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t size)
{
	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	struct s2mu106_fled_data *fled = container_of(led_cdev, struct s2mu106_fled_data, cdev);
	int chan = -1;
	int mode = -1;
	int ret = 0;

	ret = sscanf(buf, "%d %d", &chan, &mode);
	if (ret != 2)
		pr_err("%s: sscanf fail\n", __func__);

	if ((chan <= 0) || (chan > S2MU106_CH_MAX) || (mode < 0) || (mode >= S2MU106_FLED_MODE_MAX)) {
		pr_err("%s: channel: %d, mode: %d\n", __func__, chan, mode);
		pr_err("%s: Wrong channel or mode.\n", __func__);
		return -EFAULT;
	}

	s2mu106_fled_set_mode(fled, chan, mode);
#if IS_ENABLED(DEBUG_TEST_READ)
	s2mu106_fled_test_read(fled);
#endif

	return size;
}

static DEVICE_ATTR(fled_mode, 0644, fled_mode_show, fled_mode_store);
static DEVICE_ATTR(fled_flash_curr, 0644, fled_flash_curr_show, fled_flash_curr_store);
static DEVICE_ATTR(fled_torch_curr, 0644, fled_torch_curr_show, fled_torch_curr_store);

static struct attribute *s2mu106_fled_attrs[] = {
	&dev_attr_fled_mode.attr,
	&dev_attr_fled_flash_curr.attr,
	&dev_attr_fled_torch_curr.attr,
	NULL
};
ATTRIBUTE_GROUPS(s2mu106_fled);

void s2mu106_fled_set_operation_mode(int mode)
{
	if (mode) {
		s2mu106_fled_operating_mode(g_fled_data, TA_MODE);
		g_fled_data->set_on_factory = 1;
		pr_info("%s: TA only mode set\n", __func__);
	} else {
		g_fled_data->set_on_factory = 0;
		s2mu106_fled_operating_mode(g_fled_data, AUTO_MODE);
		pr_info("%s: Auto control mode set\n", __func__);
	}
}
EXPORT_SYMBOL_GPL(s2mu106_fled_set_operation_mode);

static void s2mu106_fled_init(struct s2mu106_fled_data *fled)
{
	int i;
	struct i2c_client *i2c = fled->i2c;

	pr_info("%s: s2mu106_fled init start\n", __func__);

	fled->is_en_flash = false;
	if (gpio_is_valid(fled->pdata->flash_gpio) &&
			gpio_is_valid(fled->pdata->torch_gpio)) {
		pr_info("%s: s2mu106_fled gpio mode\n", __func__);
		fled->control_mode = CONTROL_GPIO;
		gpio_request_one(fled->flash_gpio, GPIOF_OUT_INIT_LOW, "LED_GPIO_OUTPUT_LOW");
		gpio_request_one(fled->torch_gpio, GPIOF_OUT_INIT_LOW, "LED_GPIO_OUTPUT_LOW");
		gpio_free(fled->flash_gpio);
		gpio_free(fled->torch_gpio);
		/* CAM_FLASH_EN -> FLASH gpio mode */
		s2mu106_fled_set_mode(fled, 0, S2MU106_FLED_MODE_FLASH);
		/* CAM_TORCH_EN -> TORCH gpio mode */
		s2mu106_fled_set_mode(fled, 0, S2MU106_FLED_MODE_TORCH);
		s2mu106_fled_set_mode(fled, 1, S2MU106_FLED_MODE_OFF);
	} else {
		fled->control_mode = CONTROL_I2C;
	}

	fled->set_on_factory = 0;
	/* for Flash Auto boost */
	s2mu106_update_reg(i2c, S2MU106_FLED_TEST3, 0x20, 0x20);
	s2mu106_update_reg(i2c, S2MU106_FLED_TEST4, 0x40, 0x40);

	for (i = 1; i <= S2MU106_CH_MAX; i++) {
		s2mu106_fled_set_flash_curr(fled, i, fled->default_current);
		s2mu106_fled_set_torch_curr(fled, i, fled->default_current);
	}
	/* flash current set */
	s2mu106_fled_set_flash_curr(fled, 1, fled->flash_current);

	/* torch current set */
	s2mu106_fled_set_torch_curr(fled, 1, fled->torch_current);

	/* w/a: prevent SMPL event in case of flash operation */
	s2mu106_update_reg(i2c, 0x21, 0x4, 0x7);
	s2mu106_update_reg(i2c, 0x89, 0x0, 0x3);

	fled->psy_chg = power_supply_get_by_name("s2mu106-charger");

#if IS_ENABLED(DEBUG_TEST_READ)
	s2mu106_fled_test_read(fled);
#endif
}

#if IS_ENABLED(CONFIG_OF)
static int s2mu106_led_dt_parse_pdata(struct device *dev, struct s2mu106_fled_platform_data *pdata)
{
	struct device_node *led_np, *np, *c_np;
	int ret;
	u32 temp;
	u32 index;

	led_np = dev->parent->of_node;

	if (!led_np) {
		pr_err("<%s> could not find led sub-node led_np\n", __func__);
		return -ENODEV;
	}

	np = of_find_node_by_name(led_np, "flash_led");
	if (!np) {
		pr_err("%s : could not find led sub-node np\n", __func__);
		return -EINVAL;
	}

	ret = of_property_read_u32(np, "default_current", &pdata->default_current);
	if (ret < 0)
		pr_err("%s : could not find default_current\n", __func__);

	ret = of_property_read_u32(np, "max_current", &pdata->max_current);
	if (ret < 0)
		pr_err("%s : could not find max_current\n", __func__);

	ret = of_property_read_u32(np, "default_timer", &pdata->default_timer);
	if (ret < 0)
		pr_err("%s : could not find default_timer\n", __func__);


	ret = pdata->flash_gpio = of_get_named_gpio(np, "flash-gpio", 0);
	if (ret < 0) {
		pr_err("%s : can't get flash-gpio\n", __func__);
		return ret;
	}

	ret = pdata->torch_gpio = of_get_named_gpio(np, "torch-gpio", 0);
	if (ret < 0) {
		pr_err("%s : can't get torch-gpio\n", __func__);
		return ret;
	}

	ret = of_property_read_u32(np, "flash_current",
			&pdata->flash_current);
	if (ret < 0)
		pr_err("%s : could not find flash_current\n", __func__);

	ret = of_property_read_u32(np, "preflash_current",
			&pdata->preflash_current);
	if (ret < 0)
		pr_err("%s : could not find preflash_current\n", __func__);

	ret = of_property_read_u32(np, "torch_current",
			&pdata->torch_current);
	if (ret < 0)
		pr_err("%s : could not find torch_current\n", __func__);

	ret = of_property_read_u32(np, "movie_current",
			&pdata->movie_current);
	if (ret < 0)
		pr_err("%s : could not find movie_current\n", __func__);

	ret = of_property_read_u32(np, "factory_current",
			&pdata->factory_current);
	if (ret < 0)
		pr_err("%s : could not find factory_current\n", __func__);

	ret = of_property_read_u32_array(np, "flashlight_current",
			pdata->flashlight_current, S2MU106_FLASH_LIGHT_MAX);
	if (ret < 0) {
		pr_err("%s : could not find flashlight_current\n", __func__);

		//default setting
		pdata->flashlight_current[0] = 45;
		pdata->flashlight_current[1] = 75;
		pdata->flashlight_current[2] = 125;
		pdata->flashlight_current[3] = 195;
		pdata->flashlight_current[4] = 270;
	}

	pdata->chan_num = of_get_child_count(np);

	if (pdata->chan_num > S2MU106_CH_MAX)
		pdata->chan_num = S2MU106_CH_MAX;

	pdata->channel = devm_kzalloc(dev, sizeof(struct s2mu106_fled_chan) * pdata->chan_num, GFP_KERNEL);

	for_each_child_of_node(np, c_np) {
		ret = of_property_read_u32(c_np, "id", &temp);
		if (ret < 0)
			goto dt_err;
		index = temp;

		pr_info("%s: temp = %d, index = %d\n", __func__, temp, index);

		if (index < S2MU106_CH_MAX) {
			pdata->channel[index].id = index;

			ret = of_property_read_u32_index(np, "current", index, &pdata->channel[index].curr);
			if (ret < 0) {
				pr_err("%s : could not find current for channel%d\n",
					__func__, pdata->channel[index].id);
				pdata->channel[index].curr = pdata->default_current;
			}

			ret = of_property_read_u32_index(np, "timer", index, &pdata->channel[index].timer);
			if (ret < 0) {
				pr_err("%s : could not find timer for channel%d\n",
					__func__, pdata->channel[index].id);
				pdata->channel[index].timer = pdata->default_timer;
			}
		}
	}
	return 0;
dt_err:
	pr_err("%s: DT parsing finish. ret = %d\n", __func__, ret);
	return ret;
}
#endif /* CONFIG_OF */

static ssize_t rear_flash_store(struct device *dev,
	struct device_attribute *attr, const char *buf, size_t size)
{
	int mode = -1;
	int value = 0;
	int flash_current = 0;
	int torch_current = 0;

	pr_info("%s: rear_flash_store start\n", __func__);
	if ((buf == NULL) || kstrtouint(buf, 10, &value)) {
		return -1;
	}

	if ((value < 0)) {
		pr_err("%s: Unsupported value: %d\n", __func__, value);
		return -EFAULT;
	}
	pr_info("%s: %d: rear_flash_store:\n", __func__, value);
	g_fled_data->sysfs_input_data = value;

	flash_current = g_fled_data->flash_current;
	torch_current = g_fled_data->torch_current;

	if (value <= 0) {
		mode = S2MU106_FLED_MODE_OFF;
	} else if (value == 1) {
		mode = S2MU106_FLED_MODE_TORCH;
	} else if (value == 100) {
		/* Factory Torch*/
		pr_info("%s: factory torch current [%d]\n", __func__, g_fled_data->factory_current);
		torch_current = g_fled_data->factory_current;
		mode = S2MU106_FLED_MODE_TORCH;
	} else if (value == 200) {
		/* Factory Flash */
		pr_info("%s: factory flash current [%d]\n", __func__, g_fled_data->factory_current);
		flash_current = g_fled_data->factory_current;
		mode = S2MU106_FLED_MODE_FLASH;
	} else if (value <= 1010 && value >= 1001) {
		mode = S2MU106_FLED_MODE_TORCH;
		/* (value) 1001, 1002, 1004, 1006, 1009 */
		if (value <= 1001)
			torch_current = g_fled_data->flashlight_current[0];
		else if (value <= 1002)
			torch_current = g_fled_data->flashlight_current[1];
		else if (value <= 1004)
			torch_current = g_fled_data->flashlight_current[2];
		else if (value <= 1006)
			torch_current = g_fled_data->flashlight_current[3];
		else if (value <= 1009)
			torch_current = g_fled_data->flashlight_current[4];
		else
			torch_current = g_fled_data->torch_current;
		g_fled_data->sysfs_input_data = 1;
	} else if (value == 2) {
		mode = S2MU106_FLED_MODE_FLASH;
	}

	mutex_lock(&g_fled_data->lock);
	if (mode == S2MU106_FLED_MODE_TORCH) {
		pr_info("%s: %d: S2MU106_FLED_MODE_FACTORY - %dmA\n", __func__, value, torch_current);
		/* torch current set */
		s2mu106_fled_set_torch_curr(g_fled_data, 1, torch_current);
		s2mu106_fled_set_mode(g_fled_data, 1, S2MU106_FLED_MODE_TORCH);
	} else if (mode == S2MU106_FLED_MODE_FLASH) {
		pr_info("%s: %d: S2MU106_FLED_MODE_FLASH - %dmA\n", __func__, value, flash_current);
		/* flash current set */
		s2mu106_fled_set_flash_curr(g_fled_data, 1, flash_current);
		s2mu106_fled_set_mode(g_fled_data, 1, S2MU106_FLED_MODE_FLASH);
	} else {
		pr_info("%s: %d: S2MU106_FLED_MODE_OFF\n", __func__, value);

		/* flase, torch current set for initial current */
		flash_current = g_fled_data->flash_current;
		torch_current = g_fled_data->torch_current;
		/* flash current set */
		s2mu106_fled_set_flash_curr(g_fled_data, 1, flash_current);
		/* torch current set */
		s2mu106_fled_set_torch_curr(g_fled_data, 1, torch_current);
		s2mu106_fled_set_mode(g_fled_data, 1, S2MU106_FLED_MODE_OFF);
	}
	mutex_unlock(&g_fled_data->lock);
#if IS_ENABLED(DEBUG_TEST_READ)
	s2mu106_fled_test_read(g_fled_data);
#endif
	pr_info("%s: rear_flash_store END\n", __func__);
	return size;
}

static ssize_t rear_flash_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	return sprintf(buf, "%d\n", g_fled_data->sysfs_input_data);
}


static DEVICE_ATTR(rear_flash, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH,
	rear_flash_show, rear_flash_store);
static DEVICE_ATTR(rear_torch_flash, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH,
	rear_flash_show, rear_flash_store);

static int create_flash_sysfs(struct s2mu106_fled_data *fled_data)
{
	int err = -ENODEV;
	struct device *flash_dev = fled_data->flash_dev;

	if (IS_ERR_OR_NULL(camera_class)) {
		pr_err("flash_sysfs: error, camera class not exist");
		return -ENODEV;
	}

	flash_dev = device_create(camera_class, NULL, 0, NULL, "flash");
	if (IS_ERR(flash_dev)) {
		pr_err("flash_sysfs: failed to create device(flash)\n");
		return -ENODEV;
	}
	err = device_create_file(flash_dev, &dev_attr_rear_flash);
	if (unlikely(err < 0)) {
		pr_err("flash_sysfs: failed to create device file, %s\n",
				dev_attr_rear_flash.attr.name);
	}
	err = device_create_file(flash_dev, &dev_attr_rear_torch_flash);
	if (unlikely(err < 0)) {
		pr_err("flash_sysfs: failed to create device file, %s\n",
				dev_attr_rear_torch_flash.attr.name);
	}

	return 0;
}

static int s2mu106_led_probe(struct platform_device *pdev)
{
	int ret = 0;
	int cnt = 0;
	struct s2mu106_dev *s2mu106 = dev_get_drvdata(pdev->dev.parent);
	struct s2mu106_fled_data *fled_data;

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

	if (!s2mu106) {
		dev_err(&pdev->dev, "drvdata->dev.parent not supplied\n");
		return -ENODEV;
	}

	fled_data = devm_kzalloc(&pdev->dev, sizeof(struct s2mu106_fled_data), GFP_KERNEL);
	if (!fled_data) {
		pr_err("%s: failed to allocate driver data\n", __func__);
		return -ENOMEM;
	}
	fled_data->dev = &pdev->dev;
	fled_data->i2c = s2mu106->i2c;
	fled_data->pdata = devm_kzalloc(&pdev->dev, sizeof(*(fled_data->pdata)), GFP_KERNEL);
	if (!fled_data->pdata) {
		pr_err("%s: failed to allocate platform data\n", __func__);
		return -ENOMEM;
	}

	if (s2mu106->dev->of_node) {
		ret = s2mu106_led_dt_parse_pdata(&pdev->dev, fled_data->pdata);
		if (ret < 0) {
			pr_err("%s: not found leds dt! ret=%d\n", __func__, ret);
			return -1;
		}
	}

	platform_set_drvdata(pdev, fled_data);

	/* Store fled_data for EXPORT_SYMBOL */
	g_fled_data = fled_data;
	fled_data->cdev.name = "fled-s2mu106";
	fled_data->cdev.groups = s2mu106_fled_groups;

	ret = devm_led_classdev_register(&pdev->dev, &fled_data->cdev);
	if (ret < 0) {
		pr_err("%s: unable to register LED class dev\n", __func__);
		return ret;
	}

	g_fled_data->flash_gpio = fled_data->pdata->flash_gpio;
	g_fled_data->torch_gpio = fled_data->pdata->torch_gpio;
	g_fled_data->default_current = fled_data->pdata->default_current;
	g_fled_data->flash_current = fled_data->pdata->flash_current;
	g_fled_data->torch_current = fled_data->pdata->torch_current;
	g_fled_data->preflash_current = fled_data->pdata->preflash_current;
	g_fled_data->movie_current = fled_data->pdata->movie_current;
	g_fled_data->factory_current = fled_data->pdata->factory_current;

	for (cnt = 0; cnt < S2MU106_FLASH_LIGHT_MAX; cnt++) {
		g_fled_data->flashlight_current[cnt] = fled_data->pdata->flashlight_current[cnt];
	}

	s2mu106_fled_init(g_fled_data);
	mutex_init(&fled_data->lock);

	//create sysfs for camera.
	create_flash_sysfs(fled_data);

	pr_info("%s: end\n", __func__);
	return 0;
}

static int s2mu106_led_remove(struct platform_device *pdev)
{
	return 0;
}

static void s2mu106_led_shutdown(struct platform_device *pdev)
{
	struct s2mu106_fled_data *fled_data =
		platform_get_drvdata(pdev);
	int chan;

	if (!fled_data->i2c) {
		pr_err("%s: no i2c client\n", __func__);
		return;
	}

	/* Turn off all leds when power off */
	pr_info("%s: turn off all leds\n", __func__);
	for (chan = 1; chan <= S2MU106_CH_MAX; chan++)
		s2mu106_fled_set_mode(fled_data, chan, S2MU106_FLED_MODE_OFF);
}

static struct platform_driver s2mu106_led_driver = {
	.driver = {
		.name  = "leds-s2mu106",
		.owner = THIS_MODULE,
		},
	.probe  = s2mu106_led_probe,
	.remove = s2mu106_led_remove,
	.shutdown = s2mu106_led_shutdown,
};

static int __init s2mu106_led_driver_init(void)
{
	return platform_driver_register(&s2mu106_led_driver);
}
module_init(s2mu106_led_driver_init);

static void __exit s2mu106_led_driver_exit(void)
{
	platform_driver_unregister(&s2mu106_led_driver);
}
module_exit(s2mu106_led_driver_exit);

MODULE_AUTHOR("Keunho Hwang <keunho.hwang@samsung.com>");
MODULE_DESCRIPTION("SAMSUNG s2mu106 flash LED Driver");
MODULE_LICENSE("GPL");