drivers/leds/leds-ktd2692.c - LeafOS-Devices/android_kernel_samsung_exynos9820 - Gitiles

 /*
  * LED driver - leds-ktd2692.c
  *
  * Copyright (C) 2020 Sunggeun Yim <sunggeun.yim@samsung.com>
  *
  * 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/module.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/pwm.h>
 #include <linux/vmalloc.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <linux/gpio.h>
 #include <linux/leds-ktd2692.h>
 #include <linux/time.h>
 #ifdef CONFIG_OF
 #include <linux/of.h>
 #include <linux/of_gpio.h>
 #endif

 //#define DEBUG_LED_TIME

 extern struct class *camera_class; /*sys/class/camera*/
 struct device *ktd2692_dev;

 struct ktd2692_platform_data *global_ktd2692data = NULL;
 struct device *global_dev;

 void ktd2692_setGpio(int onoff)
 {
 	if (onoff) {
 		__gpio_set_value(global_ktd2692data->flash_control, 1);
 	} else {
 		__gpio_set_value(global_ktd2692data->flash_control, 0);
 	}
 }

 void ktd2692_set_low_bit(void)
 {
 #ifdef DEBUG_LED_TIME
 	struct timeval start_low, end_low, start_high, end_high;
 	unsigned long time_low, time_high;
 #endif

 #ifdef DEBUG_LED_TIME
 	do_gettimeofday(&start_low);
 #endif

 	__gpio_set_value(global_ktd2692data->flash_control, 0);
 	udelay(T_L_LB);

 #ifdef DEBUG_LED_TIME
 	do_gettimeofday(&end_low);

 	do_gettimeofday(&start_high);
 #endif

 	__gpio_set_value(global_ktd2692data->flash_control, 1);
 	udelay(T_H_LB);

 #ifdef DEBUG_LED_TIME
 	do_gettimeofday(&end_high);

 	time_low = (end_low.tv_sec - start_low.tv_sec) * 1000000 + (end_low.tv_usec - start_low.tv_usec);
 	time_high = (end_high.tv_sec - start_high.tv_sec) * 1000000 + (end_high.tv_usec - start_high.tv_usec);

 	LED_INFO("[ta] LOW BIT: time_low(%lu) / time_high(%lu)\n", time_low, time_high);
 	if (time_low <= (time_high*2))
 		LED_ERROR("[ta] Low Bit: high pulse too long\n");
 #endif
 }

 void ktd2692_set_high_bit(void)
 {
 #ifdef DEBUG_LED_TIME
 	struct timeval start_low, end_low, start_high, end_high;
 	unsigned long time_low, time_high;
 #endif

 #ifdef DEBUG_LED_TIME
 	do_gettimeofday(&start_low);
 #endif

 	__gpio_set_value(global_ktd2692data->flash_control, 0);
 	udelay(T_L_HB);

 #ifdef DEBUG_LED_TIME
 	do_gettimeofday(&end_low);

 	do_gettimeofday(&start_high);
 #endif

 	__gpio_set_value(global_ktd2692data->flash_control, 1);
 	udelay(T_H_HB);

 #ifdef DEBUG_LED_TIME
 	do_gettimeofday(&end_high);

 	time_low = (end_low.tv_sec - start_low.tv_sec) * 1000000 + (end_low.tv_usec - start_low.tv_usec);
 	time_high = (end_high.tv_sec - start_high.tv_sec) * 1000000 + (end_high.tv_usec - start_high.tv_usec);

 	LED_INFO("[ta] HIGHT BIT: time_low(%lu) / time_high(%lu)\n", time_low, time_high);
 	if ((time_low*2) >= time_high)
 		LED_ERROR("[ta] HIGH BIT: low pulse too long\n");
 #endif
 }

 static int ktd2692_set_bit(unsigned int bit)
 {
 	if (bit) {
 		ktd2692_set_high_bit();
 	} else {
 		ktd2692_set_low_bit();
 	}
 	return 0;
 }

 static int ktd2692_write_data(unsigned data)
 {
 	int err = 0;
 	unsigned int bit = 0;

 	/* Data Start Condition */
 	__gpio_set_value(global_ktd2692data->flash_control, 1);
 	udelay(T_SOD);

 	/* BIT 7*/
 	bit = ((data>> 7) & 0x01);
 	ktd2692_set_bit(bit);

 	/* BIT 6 */
 	bit = ((data>> 6) & 0x01);
 	ktd2692_set_bit(bit);

 	/* BIT 5*/
 	bit = ((data>> 5) & 0x01);
 	ktd2692_set_bit(bit);

 	/* BIT 4 */
 	bit = ((data>> 4) & 0x01);
 	ktd2692_set_bit(bit);

 	/* BIT 3*/
 	bit = ((data>> 3) & 0x01);
 	ktd2692_set_bit(bit);

 	/* BIT 2 */
 	bit = ((data>> 2) & 0x01);
 	ktd2692_set_bit(bit);

 	/* BIT 1*/
 	bit = ((data>> 1) & 0x01);
 	ktd2692_set_bit(bit);

 	/* BIT 0 */
 	bit = ((data>> 0) & 0x01);
 	ktd2692_set_bit(bit);

 	 __gpio_set_value(global_ktd2692data->flash_control, 0);
 	udelay(T_EOD_L);

 	/* Data End Condition */
 	__gpio_set_value(global_ktd2692data->flash_control, 1);
 	udelay(T_EOD_H);

 	return err;
 }

 ssize_t ktd2692_store(struct device *dev,
 			struct device_attribute *attr, const char *buf,
 			size_t count)
 {
 	int value = 0;
 	int brightness_value = 0;
 	int ret = 0;
 	unsigned long flags = 0;
 	int torch_intensity = -1;
 	struct pinctrl *pinctrl;

 	if ((buf == NULL) || kstrtouint(buf, 10, &value)) {
 		return -1;
 	}

 	if (global_ktd2692data == NULL) {
 		LED_ERROR("KTD2692(%s) global_ktd2692data is not initialized.\n", __func__);
 		return -EFAULT;
 	}

 	global_ktd2692data->sysfs_input_data = value;

 	if (value <= 0) {
 		ret = gpio_request(global_ktd2692data->flash_control, "ktd2692_led_control");
 		if (ret) {
 			LED_ERROR("Failed to requeset ktd2692_led_control\n");
 		} else {
 			LED_INFO("KTD2692-TORCH OFF. : E(%d)\n", value);

 			global_ktd2692data->mode_status = KTD2692_DISABLES_MOVIE_FLASH_MODE;
 			spin_lock_irqsave(&global_ktd2692data->int_lock, flags);
 			ktd2692_write_data(global_ktd2692data->mode_status|
 								KTD2692_ADDR_MOVIE_FLASHMODE_CONTROL);
 			spin_unlock_irqrestore(&global_ktd2692data->int_lock, flags);

 			ktd2692_setGpio(0);
 			gpio_free(global_ktd2692data->flash_control);
 			global_ktd2692data->is_torch_enable = false;
 			LED_INFO("KTD2692-TORCH OFF. : X(%d)\n", value);
 		}

 		pinctrl = devm_pinctrl_get_select(global_dev, "is");
 		if (IS_ERR(pinctrl))
 			pr_err("%s: flash %s pins are not configured\n", __func__, "is");

 	} else {
 		pinctrl = devm_pinctrl_get_select(global_dev, "host");
 		if (IS_ERR(pinctrl))
 			pr_err("%s: flash %s pins are not configured\n", __func__, "host");

 		ret = gpio_request(global_ktd2692data->flash_control, "ktd2692_led_control");
 		if (ret) {
 			LED_ERROR("Failed to requeset ktd2692_led_control\n");
 		} else {
 			LED_INFO("KTD2692-TORCH ON. : E(%d)\n", value);

 			global_ktd2692data->mode_status = KTD2692_ENABLE_MOVIE_MODE;
 			global_ktd2692data->is_torch_enable = true;
 			spin_lock_irqsave(&global_ktd2692data->int_lock, flags);
 			ktd2692_write_data(global_ktd2692data->LVP_Voltage|
 								KTD2692_ADDR_LVP_SETTING);
 #if 0	/* use the internel defualt setting */
 			ktd2692_write_data(global_ktd2692data->flash_timeout|
 								KTD2692_ADDR_FLASH_TIMEOUT_SETTING);
 #endif
 			if (value == 100) {
 				ktd2692_write_data(global_ktd2692data->factory_current_value|
 									KTD2692_ADDR_MOVIE_CURRENT_SETTING);
 			} else if (1001 <= value && value <= 1010) {
 				brightness_value = value - 1001;
 				if (global_ktd2692data->torch_table[brightness_value] != 0) {
 					torch_intensity = KTD2692_CAL_MOVIE_CURRENT(KTD2692_TORCH_STEP_LEVEL_CURRENT(global_ktd2692data->torch_table[brightness_value], global_ktd2692data->max_current),
 						global_ktd2692data->max_current);
 				}
 				if (torch_intensity < 0) {
 					LED_INFO("KTD2692-force to set as default : %d\n", global_ktd2692data->torch_current_value);
 					torch_intensity = global_ktd2692data->torch_current_value;
 				}
 				ktd2692_write_data(torch_intensity|
 									KTD2692_ADDR_MOVIE_CURRENT_SETTING);
 			} else {
 				ktd2692_write_data(global_ktd2692data->torch_current_value|
 									KTD2692_ADDR_MOVIE_CURRENT_SETTING);
 			}
 			ktd2692_write_data(global_ktd2692data->mode_status|
 								KTD2692_ADDR_MOVIE_FLASHMODE_CONTROL);
 			spin_unlock_irqrestore(&global_ktd2692data->int_lock, flags);

 			gpio_free(global_ktd2692data->flash_control);
 			LED_INFO("KTD2692-TORCH ON. : X(%d)\n", value);
 		}
 	}

 	if (!IS_ERR(pinctrl))
 		devm_pinctrl_put(pinctrl);

 	return count;
 }

 EXPORT_SYMBOL(ktd2692_led_mode_ctrl);

 int32_t ktd2692_led_mode_ctrl(int state, u32 intensity)
 {
 	int ret = 0;
 	unsigned long flags = 0;
 	struct pinctrl *pinctrl;

 	if (global_ktd2692data == NULL) {
 		LED_ERROR("KTD2692(%s) global_ktd2692data is not initialized.\n", __func__);
 		return -EFAULT;
 	}

 	switch(state) {
 		case 1:
 			/* FlashLight Mode OFF */
 			ret = gpio_request(global_ktd2692data->flash_control, "ktd2692_led_control");
 			if (ret) {
 				LED_ERROR("Failed to request ktd2692_led_mode_ctrl\n");
 			} else {
 				LED_INFO("KTD2692-FLASH OFF E(%d)\n", state);
 				global_ktd2692data->mode_status = KTD2692_DISABLES_MOVIE_FLASH_MODE;
 				spin_lock_irqsave(&global_ktd2692data->int_lock, flags);
 				ktd2692_write_data(global_ktd2692data->mode_status|
 									KTD2692_ADDR_MOVIE_FLASHMODE_CONTROL);
 				spin_unlock_irqrestore(&global_ktd2692data->int_lock, flags);

 				ktd2692_setGpio(0);
 				gpio_free(global_ktd2692data->flash_control);
 				global_ktd2692data->is_torch_enable = false;
 				LED_INFO("KTD2692-FLASH OFF X(%d)\n", state);
 			}
 			break;
 		case 2:
 			/* FlashLight Mode Flash */
 			pinctrl = devm_pinctrl_get_select(global_dev, "host");
 			if (IS_ERR(pinctrl))
 				pr_err("%s: flash %s pins are not configured\n", __func__, "host");

 			ret = gpio_request(global_ktd2692data->flash_control, "ktd2692_led_control");
 			if (ret) {
 				LED_ERROR("Failed to request ktd2692_led_mode_ctrl\n");
 			} else {
 				LED_INFO("KTD2692-FLASH ON E(%d)\n", state);
 				global_ktd2692data->mode_status = KTD2692_ENABLE_FLASH_MODE;
 				spin_lock_irqsave(&global_ktd2692data->int_lock, flags);
 				ktd2692_write_data(global_ktd2692data->LVP_Voltage|
 									KTD2692_ADDR_LVP_SETTING);
 				if (intensity > 0) {
 					ktd2692_write_data((uint8_t)(KTD2692_FLASH_CURRENT(intensity, KTD2692_MAX_CURRENT))|
 										KTD2692_ADDR_FLASH_CURRENT_SETTING);
 					LED_INFO("[%s] : Intensity(%u) Current-Index (%d)\n", __func__, intensity,
 							 KTD2692_FLASH_CURRENT(intensity, KTD2692_MAX_CURRENT));
 				} else {
 					ktd2692_write_data(global_ktd2692data->flash_current_value|
 										KTD2692_ADDR_FLASH_CURRENT_SETTING);
 				}

 				ktd2692_write_data(global_ktd2692data->mode_status|
 									KTD2692_ADDR_MOVIE_FLASHMODE_CONTROL);
 				spin_unlock_irqrestore(&global_ktd2692data->int_lock, flags);

 				gpio_free(global_ktd2692data->flash_control);
 				LED_INFO("KTD2692-FLASH ON X(%d)\n", state);
 			}
 			break;
 		case 3:
 			/* FlashLight Mode TORCH */
 			pinctrl = devm_pinctrl_get_select(global_dev, "host");
 			if (IS_ERR(pinctrl))
 				pr_err("%s: flash %s pins are not configured\n", __func__, "host");

 			if (global_ktd2692data->is_torch_enable == true) {
 				LED_INFO("KTD2692-TORCH is already ON\n");
 				return 0;
 			}

 			ret = gpio_request(global_ktd2692data->flash_control, "ktd2692_led_control");
 			if (ret) {
 				LED_ERROR("Failed to request ktd2692_led_mode_ctrl\n");
 			} else {
 				LED_INFO("KTD2692-TORCH ON E(%d) movie current [%d] \n", state, global_ktd2692data->movie_current_value);
 				global_ktd2692data->mode_status = KTD2692_ENABLE_MOVIE_MODE;
 				spin_lock_irqsave(&global_ktd2692data->int_lock, flags);
 				ktd2692_write_data(global_ktd2692data->LVP_Voltage|
 									KTD2692_ADDR_LVP_SETTING);
 				if (intensity > 0) {
 					ktd2692_write_data((uint8_t)(KTD2692_MOVIE_CURRENT(intensity, KTD2692_MAX_CURRENT)) |
 										KTD2692_ADDR_MOVIE_CURRENT_SETTING);
 					LED_INFO("[%s] :  Intensity(%u) Current-Index (%d)\n", __func__, intensity,
 							 KTD2692_MOVIE_CURRENT(intensity, KTD2692_MAX_CURRENT));
 				} else {
 					ktd2692_write_data(global_ktd2692data->movie_current_value|
 										KTD2692_ADDR_MOVIE_CURRENT_SETTING);
 				}

 				ktd2692_write_data(global_ktd2692data->mode_status|
 									KTD2692_ADDR_MOVIE_FLASHMODE_CONTROL);
 				spin_unlock_irqrestore(&global_ktd2692data->int_lock, flags);

 				gpio_free(global_ktd2692data->flash_control);
 				LED_INFO("KTD2692-TORCH ON X(%d)\n", state);
 			}
 			break;
 		default:
 			/* FlashLight Mode OFF */
 			ret = gpio_request(global_ktd2692data->flash_control, "ktd2692_led_control");
 			if (ret) {
 				LED_ERROR("Failed to request ktd2692_led_mode_ctrl\n");
 			} else {
 				LED_INFO("KTD2692-FLASH OFF E(%d)\n", state);
 				global_ktd2692data->mode_status = KTD2692_DISABLES_MOVIE_FLASH_MODE;
 				spin_lock_irqsave(&global_ktd2692data->int_lock, flags);
 				ktd2692_write_data(global_ktd2692data->mode_status|
 									KTD2692_ADDR_MOVIE_FLASHMODE_CONTROL);
 				spin_unlock_irqrestore(&global_ktd2692data->int_lock, flags);

 				ktd2692_setGpio(0);
 				gpio_free(global_ktd2692data->flash_control);
 				LED_INFO("KTD2692-FLASH OFF X(%d)\n", state);
 			}
 			break;
 	}

 	return ret;
 }

 ssize_t ktd2692_show(struct device *dev,
 		struct device_attribute *attr, char *buf)
 {
 	return sprintf(buf, "%d\n", global_ktd2692data->sysfs_input_data);
 }

 static DEVICE_ATTR(rear_flash, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH,
 	ktd2692_show, ktd2692_store);
 static DEVICE_ATTR(rear_torch_flash, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH,
 	ktd2692_show, ktd2692_store);

 static int ktd2692_parse_dt(struct device *dev,
                                 struct ktd2692_platform_data *pdata)
 {
 	struct device_node *dnode = dev->of_node;
 	u32 buffer = 0;
 	int ret = 0;
 	u32 torch_table_enable = 0;

 	/* Defulat Value */
 	pdata->LVP_Voltage = KTD2692_DISABLE_LVP;
 	pdata->flash_timeout = KTD2692_TIMER_1049ms;	/* default */
 	pdata->min_current_value = KTD2692_MIN_CURRENT_240mA;
 	pdata->flash_current_value = KTD2692_FLASH_CURRENT(KTD2692_FLASH_DEFAULT_CURRENT, KTD2692_MAX_CURRENT);
 	pdata->movie_current_value = KTD2692_MOVIE_CURRENT(KTD2692_MOVIE_DEFAULT_CURRENT, KTD2692_MAX_CURRENT);
 	pdata->factory_current_value = KTD2692_MOVIE_CURRENT(KTD2692_FACTORY_DEFAULT_CURRENT, KTD2692_MAX_CURRENT);
 	pdata->torch_current_value = KTD2692_MOVIE_CURRENT(KTD2692_TORCH_DEFAULT_CURRENT, KTD2692_MAX_CURRENT);
 	pdata->mode_status = KTD2692_DISABLES_MOVIE_FLASH_MODE;

 	/* get gpio */
 	pdata->flash_control = of_get_named_gpio(dnode, "flash_control", 0);
 	if (!gpio_is_valid(pdata->flash_control)) {
 		dev_err(dev, "failed to get flash_control\n");
 		return -1;
 	}

 	/* get max current value */
 	if (of_property_read_u32(dnode, "max_current", &buffer) == 0) {
 		dev_info(dev, "max_current = <%d>\n",
 			buffer);
 		pdata->max_current = buffer;
 	}

 	/* get flash current value */
 	if (of_property_read_u32(dnode, "flash_current", &buffer) == 0) {
 		dev_info(dev, "flash_current = <%d><%d>\n",
 			buffer, KTD2692_FLASH_CURRENT(buffer, pdata->max_current));
 		pdata->flash_current_value = KTD2692_FLASH_CURRENT(buffer, pdata->max_current);
 	}

 	/* get movie current value */
 	if (of_property_read_u32(dnode, "movie_current", &buffer) == 0) {
 		dev_info(dev, "movie_current = <%d><%d>\n",
 			buffer, KTD2692_MOVIE_CURRENT(buffer, pdata->max_current));
 		pdata->movie_current_value = KTD2692_MOVIE_CURRENT(buffer, pdata->max_current);
 	}

 	/* get factory current value */
 	if (of_property_read_u32(dnode, "factory_current", &buffer) == 0) {
 		dev_info(dev, "factory_current = <%d><%d>\n",
 			buffer, KTD2692_MOVIE_CURRENT(buffer, pdata->max_current));
 		pdata->factory_current_value = KTD2692_MOVIE_CURRENT(buffer, pdata->max_current);
 	}

 	/* get torch current value */
 	if (of_property_read_u32(dnode, "torch_current", &buffer) == 0) {
 		dev_info(dev, "torch_current = <%d><%d>\n",
 			buffer, KTD2692_MOVIE_CURRENT(buffer, pdata->max_current));
 		pdata->torch_current_value = KTD2692_MOVIE_CURRENT(buffer, pdata->max_current);
 	}

 	ret = of_property_read_u32(dnode, "torch_table_enable", &torch_table_enable);
 	if (ret) {
 		pr_info("%s failed to get a torch_table_enable\n", __func__);
 	}
 	if (torch_table_enable == 1) {
 		pdata->torch_table_enable = torch_table_enable;
 		ret = of_property_read_u32_array(dnode, "torch_table", pdata->torch_table, TORCH_STEP);
 	} else {
 		pdata->torch_table_enable = 0;
 	}

 	return ret;
 }

 static int ktd2692_probe(struct platform_device *pdev)
 {
 	struct ktd2692_platform_data *pdata;
 	int ret = 0;

 	if (pdev->dev.of_node) {
 		pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
 		if (!pdata) {
 			dev_err(&pdev->dev, "Failed to allocate memory\n");
 			return -ENOMEM;
 		}
 		ret = ktd2692_parse_dt(&pdev->dev, pdata);
 		if (ret < 0) {
 			return -EFAULT;
 		}
 	} else {
 	pdata = pdev->dev.platform_data;
 		if (pdata == NULL) {
 			return -EFAULT;
 		}
 	}

 	global_ktd2692data = pdata;
 	global_dev = &pdev->dev;

 	LED_INFO("KTD2692_LED Probe\n");

 	global_ktd2692data->is_torch_enable = false;

 	ktd2692_dev = device_create(camera_class, NULL, 0, NULL, "flash");
 	if (IS_ERR(ktd2692_dev)) {
 		LED_ERROR("Failed to create device(flash)!\n");
 	}

 	if (device_create_file(ktd2692_dev, &dev_attr_rear_flash) < 0) {
 		LED_ERROR("failed to create device file, %s\n",
 				dev_attr_rear_flash.attr.name);
 	}
 	if (device_create_file(ktd2692_dev, &dev_attr_rear_torch_flash) < 0) {
 		LED_ERROR("failed to create device file, %s\n",
 				dev_attr_rear_torch_flash.attr.name);
 	}

 	spin_lock_init(&pdata->int_lock);

 	return 0;
 }
 static int ktd2692_remove(struct platform_device *pdev)
 {

 	device_remove_file(ktd2692_dev, &dev_attr_rear_flash);
 	device_remove_file(ktd2692_dev, &dev_attr_rear_torch_flash);
 	device_destroy(camera_class, 0);
 	class_destroy(camera_class);

 	return 0;
 }

 #ifdef CONFIG_OF
 static struct of_device_id ktd2692_dt_ids[] = {
 	{ .compatible = "ktd2692",},
 	{},
 };
 /*MODULE_DEVICE_TABLE(of, ktd2692_dt_ids);*/
 #endif

 static struct platform_driver ktd2692_driver = {
 	.driver = {
 		   .name = ktd2692_NAME,
 		   .owner = THIS_MODULE,
 #ifdef CONFIG_OF
 		   .of_match_table = ktd2692_dt_ids,
 #endif
 		   },
 	.probe = ktd2692_probe,
 	.remove = ktd2692_remove,
 };

 static int __init ktd2692_init(void)
 {
 	return platform_driver_register(&ktd2692_driver);
 }

 static void __exit ktd2692_exit(void)
 {
 	platform_driver_unregister(&ktd2692_driver);
 }

 module_init(ktd2692_init);
 module_exit(ktd2692_exit);

 MODULE_AUTHOR("sunggeun yim <sunggeun.yim@samsung.com.com>");
 MODULE_DESCRIPTION("KTD2692 driver");
 MODULE_LICENSE("GPL");
	/*
	* LED driver - leds-ktd2692.c
	*
	* Copyright (C) 2020 Sunggeun Yim <sunggeun.yim@samsung.com>
	*
	* 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/module.h>
	#include <linux/init.h>
	#include <linux/kernel.h>
	#include <linux/pwm.h>
	#include <linux/vmalloc.h>
	#include <linux/platform_device.h>
	#include <linux/slab.h>
	#include <linux/gpio.h>
	#include <linux/leds-ktd2692.h>
	#include <linux/time.h>
	#ifdef CONFIG_OF
	#include <linux/of.h>
	#include <linux/of_gpio.h>
	#endif

	//#define DEBUG_LED_TIME

	extern struct class camera_class; /sys/class/camera*/
	struct device *ktd2692_dev;

	struct ktd2692_platform_data *global_ktd2692data = NULL;
	struct device *global_dev;

	void ktd2692_setGpio(int onoff)
	{
	if (onoff) {
	__gpio_set_value(global_ktd2692data->flash_control, 1);
	} else {
	__gpio_set_value(global_ktd2692data->flash_control, 0);
	}
	}

	void ktd2692_set_low_bit(void)
	{
	#ifdef DEBUG_LED_TIME
	struct timeval start_low, end_low, start_high, end_high;
	unsigned long time_low, time_high;
	#endif

	#ifdef DEBUG_LED_TIME
	do_gettimeofday(&start_low);
	#endif

	__gpio_set_value(global_ktd2692data->flash_control, 0);
	udelay(T_L_LB);

	#ifdef DEBUG_LED_TIME
	do_gettimeofday(&end_low);

	do_gettimeofday(&start_high);
	#endif

	__gpio_set_value(global_ktd2692data->flash_control, 1);
	udelay(T_H_LB);

	#ifdef DEBUG_LED_TIME
	do_gettimeofday(&end_high);

	time_low = (end_low.tv_sec - start_low.tv_sec) * 1000000 + (end_low.tv_usec - start_low.tv_usec);
	time_high = (end_high.tv_sec - start_high.tv_sec) * 1000000 + (end_high.tv_usec - start_high.tv_usec);

	LED_INFO("[ta] LOW BIT: time_low(%lu) / time_high(%lu)\n", time_low, time_high);
	if (time_low <= (time_high*2))
	LED_ERROR("[ta] Low Bit: high pulse too long\n");
	#endif
	}

	void ktd2692_set_high_bit(void)
	{
	#ifdef DEBUG_LED_TIME
	struct timeval start_low, end_low, start_high, end_high;
	unsigned long time_low, time_high;
	#endif

	#ifdef DEBUG_LED_TIME
	do_gettimeofday(&start_low);
	#endif

	__gpio_set_value(global_ktd2692data->flash_control, 0);
	udelay(T_L_HB);

	#ifdef DEBUG_LED_TIME
	do_gettimeofday(&end_low);

	do_gettimeofday(&start_high);
	#endif

	__gpio_set_value(global_ktd2692data->flash_control, 1);
	udelay(T_H_HB);

	#ifdef DEBUG_LED_TIME
	do_gettimeofday(&end_high);

	time_low = (end_low.tv_sec - start_low.tv_sec) * 1000000 + (end_low.tv_usec - start_low.tv_usec);
	time_high = (end_high.tv_sec - start_high.tv_sec) * 1000000 + (end_high.tv_usec - start_high.tv_usec);

	LED_INFO("[ta] HIGHT BIT: time_low(%lu) / time_high(%lu)\n", time_low, time_high);
	if ((time_low*2) >= time_high)
	LED_ERROR("[ta] HIGH BIT: low pulse too long\n");
	#endif
	}

	static int ktd2692_set_bit(unsigned int bit)
	{
	if (bit) {
	ktd2692_set_high_bit();
	} else {
	ktd2692_set_low_bit();
	}
	return 0;
	}

	static int ktd2692_write_data(unsigned data)
	{
	int err = 0;
	unsigned int bit = 0;

	/* Data Start Condition */
	__gpio_set_value(global_ktd2692data->flash_control, 1);
	udelay(T_SOD);

	/* BIT 7*/
	bit = ((data>> 7) & 0x01);
	ktd2692_set_bit(bit);

	/* BIT 6 */
	bit = ((data>> 6) & 0x01);
	ktd2692_set_bit(bit);

	/* BIT 5*/
	bit = ((data>> 5) & 0x01);
	ktd2692_set_bit(bit);

	/* BIT 4 */
	bit = ((data>> 4) & 0x01);
	ktd2692_set_bit(bit);

	/* BIT 3*/
	bit = ((data>> 3) & 0x01);
	ktd2692_set_bit(bit);

	/* BIT 2 */
	bit = ((data>> 2) & 0x01);
	ktd2692_set_bit(bit);

	/* BIT 1*/
	bit = ((data>> 1) & 0x01);
	ktd2692_set_bit(bit);

	/* BIT 0 */
	bit = ((data>> 0) & 0x01);
	ktd2692_set_bit(bit);

	__gpio_set_value(global_ktd2692data->flash_control, 0);
	udelay(T_EOD_L);

	/* Data End Condition */
	__gpio_set_value(global_ktd2692data->flash_control, 1);
	udelay(T_EOD_H);

	return err;
	}

	ssize_t ktd2692_store(struct device *dev,
	struct device_attribute attr, const char buf,
	size_t count)
	{
	int value = 0;
	int brightness_value = 0;
	int ret = 0;
	unsigned long flags = 0;
	int torch_intensity = -1;
	struct pinctrl *pinctrl;

	if ((buf == NULL) \|\| kstrtouint(buf, 10, &value)) {
	return -1;
	}

	if (global_ktd2692data == NULL) {
	LED_ERROR("KTD2692(%s) global_ktd2692data is not initialized.\n", __func__);
	return -EFAULT;
	}

	global_ktd2692data->sysfs_input_data = value;

	if (value <= 0) {
	ret = gpio_request(global_ktd2692data->flash_control, "ktd2692_led_control");
	if (ret) {
	LED_ERROR("Failed to requeset ktd2692_led_control\n");
	} else {
	LED_INFO("KTD2692-TORCH OFF. : E(%d)\n", value);

	global_ktd2692data->mode_status = KTD2692_DISABLES_MOVIE_FLASH_MODE;
	spin_lock_irqsave(&global_ktd2692data->int_lock, flags);
	ktd2692_write_data(global_ktd2692data->mode_status\|
	KTD2692_ADDR_MOVIE_FLASHMODE_CONTROL);
	spin_unlock_irqrestore(&global_ktd2692data->int_lock, flags);

	ktd2692_setGpio(0);
	gpio_free(global_ktd2692data->flash_control);
	global_ktd2692data->is_torch_enable = false;
	LED_INFO("KTD2692-TORCH OFF. : X(%d)\n", value);
	}

	pinctrl = devm_pinctrl_get_select(global_dev, "is");
	if (IS_ERR(pinctrl))
	pr_err("%s: flash %s pins are not configured\n", __func__, "is");

	} else {
	pinctrl = devm_pinctrl_get_select(global_dev, "host");
	if (IS_ERR(pinctrl))
	pr_err("%s: flash %s pins are not configured\n", __func__, "host");

	ret = gpio_request(global_ktd2692data->flash_control, "ktd2692_led_control");
	if (ret) {
	LED_ERROR("Failed to requeset ktd2692_led_control\n");
	} else {
	LED_INFO("KTD2692-TORCH ON. : E(%d)\n", value);

	global_ktd2692data->mode_status = KTD2692_ENABLE_MOVIE_MODE;
	global_ktd2692data->is_torch_enable = true;
	spin_lock_irqsave(&global_ktd2692data->int_lock, flags);
	ktd2692_write_data(global_ktd2692data->LVP_Voltage\|
	KTD2692_ADDR_LVP_SETTING);
	#if 0 /* use the internel defualt setting */
	ktd2692_write_data(global_ktd2692data->flash_timeout\|
	KTD2692_ADDR_FLASH_TIMEOUT_SETTING);
	#endif
	if (value == 100) {
	ktd2692_write_data(global_ktd2692data->factory_current_value\|
	KTD2692_ADDR_MOVIE_CURRENT_SETTING);
	} else if (1001 <= value && value <= 1010) {
	brightness_value = value - 1001;
	if (global_ktd2692data->torch_table[brightness_value] != 0) {
	torch_intensity = KTD2692_CAL_MOVIE_CURRENT(KTD2692_TORCH_STEP_LEVEL_CURRENT(global_ktd2692data->torch_table[brightness_value], global_ktd2692data->max_current),
	global_ktd2692data->max_current);
	}
	if (torch_intensity < 0) {
	LED_INFO("KTD2692-force to set as default : %d\n", global_ktd2692data->torch_current_value);
	torch_intensity = global_ktd2692data->torch_current_value;
	}
	ktd2692_write_data(torch_intensity\|
	KTD2692_ADDR_MOVIE_CURRENT_SETTING);
	} else {
	ktd2692_write_data(global_ktd2692data->torch_current_value\|
	KTD2692_ADDR_MOVIE_CURRENT_SETTING);
	}
	ktd2692_write_data(global_ktd2692data->mode_status\|
	KTD2692_ADDR_MOVIE_FLASHMODE_CONTROL);
	spin_unlock_irqrestore(&global_ktd2692data->int_lock, flags);

	gpio_free(global_ktd2692data->flash_control);
	LED_INFO("KTD2692-TORCH ON. : X(%d)\n", value);
	}
	}

	if (!IS_ERR(pinctrl))
	devm_pinctrl_put(pinctrl);

	return count;
	}

	EXPORT_SYMBOL(ktd2692_led_mode_ctrl);

	int32_t ktd2692_led_mode_ctrl(int state, u32 intensity)
	{
	int ret = 0;
	unsigned long flags = 0;
	struct pinctrl *pinctrl;

	if (global_ktd2692data == NULL) {
	LED_ERROR("KTD2692(%s) global_ktd2692data is not initialized.\n", __func__);
	return -EFAULT;
	}

	switch(state) {
	case 1:
	/* FlashLight Mode OFF */
	ret = gpio_request(global_ktd2692data->flash_control, "ktd2692_led_control");
	if (ret) {
	LED_ERROR("Failed to request ktd2692_led_mode_ctrl\n");
	} else {
	LED_INFO("KTD2692-FLASH OFF E(%d)\n", state);
	global_ktd2692data->mode_status = KTD2692_DISABLES_MOVIE_FLASH_MODE;
	spin_lock_irqsave(&global_ktd2692data->int_lock, flags);
	ktd2692_write_data(global_ktd2692data->mode_status\|
	KTD2692_ADDR_MOVIE_FLASHMODE_CONTROL);
	spin_unlock_irqrestore(&global_ktd2692data->int_lock, flags);

	ktd2692_setGpio(0);
	gpio_free(global_ktd2692data->flash_control);
	global_ktd2692data->is_torch_enable = false;
	LED_INFO("KTD2692-FLASH OFF X(%d)\n", state);
	}
	break;
	case 2:
	/* FlashLight Mode Flash */
	pinctrl = devm_pinctrl_get_select(global_dev, "host");
	if (IS_ERR(pinctrl))
	pr_err("%s: flash %s pins are not configured\n", __func__, "host");

	ret = gpio_request(global_ktd2692data->flash_control, "ktd2692_led_control");
	if (ret) {
	LED_ERROR("Failed to request ktd2692_led_mode_ctrl\n");
	} else {
	LED_INFO("KTD2692-FLASH ON E(%d)\n", state);
	global_ktd2692data->mode_status = KTD2692_ENABLE_FLASH_MODE;
	spin_lock_irqsave(&global_ktd2692data->int_lock, flags);
	ktd2692_write_data(global_ktd2692data->LVP_Voltage\|
	KTD2692_ADDR_LVP_SETTING);
	if (intensity > 0) {
	ktd2692_write_data((uint8_t)(KTD2692_FLASH_CURRENT(intensity, KTD2692_MAX_CURRENT))\|
	KTD2692_ADDR_FLASH_CURRENT_SETTING);
	LED_INFO("[%s] : Intensity(%u) Current-Index (%d)\n", __func__, intensity,
	KTD2692_FLASH_CURRENT(intensity, KTD2692_MAX_CURRENT));
	} else {
	ktd2692_write_data(global_ktd2692data->flash_current_value\|
	KTD2692_ADDR_FLASH_CURRENT_SETTING);
	}

	ktd2692_write_data(global_ktd2692data->mode_status\|
	KTD2692_ADDR_MOVIE_FLASHMODE_CONTROL);
	spin_unlock_irqrestore(&global_ktd2692data->int_lock, flags);

	gpio_free(global_ktd2692data->flash_control);
	LED_INFO("KTD2692-FLASH ON X(%d)\n", state);
	}
	break;
	case 3:
	/* FlashLight Mode TORCH */
	pinctrl = devm_pinctrl_get_select(global_dev, "host");
	if (IS_ERR(pinctrl))
	pr_err("%s: flash %s pins are not configured\n", __func__, "host");

	if (global_ktd2692data->is_torch_enable == true) {
	LED_INFO("KTD2692-TORCH is already ON\n");
	return 0;
	}

	ret = gpio_request(global_ktd2692data->flash_control, "ktd2692_led_control");
	if (ret) {
	LED_ERROR("Failed to request ktd2692_led_mode_ctrl\n");
	} else {
	LED_INFO("KTD2692-TORCH ON E(%d) movie current [%d] \n", state, global_ktd2692data->movie_current_value);
	global_ktd2692data->mode_status = KTD2692_ENABLE_MOVIE_MODE;
	spin_lock_irqsave(&global_ktd2692data->int_lock, flags);
	ktd2692_write_data(global_ktd2692data->LVP_Voltage\|
	KTD2692_ADDR_LVP_SETTING);
	if (intensity > 0) {
	ktd2692_write_data((uint8_t)(KTD2692_MOVIE_CURRENT(intensity, KTD2692_MAX_CURRENT)) \|
	KTD2692_ADDR_MOVIE_CURRENT_SETTING);
	LED_INFO("[%s] : Intensity(%u) Current-Index (%d)\n", __func__, intensity,
	KTD2692_MOVIE_CURRENT(intensity, KTD2692_MAX_CURRENT));
	} else {
	ktd2692_write_data(global_ktd2692data->movie_current_value\|
	KTD2692_ADDR_MOVIE_CURRENT_SETTING);
	}

	ktd2692_write_data(global_ktd2692data->mode_status\|
	KTD2692_ADDR_MOVIE_FLASHMODE_CONTROL);
	spin_unlock_irqrestore(&global_ktd2692data->int_lock, flags);

	gpio_free(global_ktd2692data->flash_control);
	LED_INFO("KTD2692-TORCH ON X(%d)\n", state);
	}
	break;
	default:
	/* FlashLight Mode OFF */
	ret = gpio_request(global_ktd2692data->flash_control, "ktd2692_led_control");
	if (ret) {
	LED_ERROR("Failed to request ktd2692_led_mode_ctrl\n");
	} else {
	LED_INFO("KTD2692-FLASH OFF E(%d)\n", state);
	global_ktd2692data->mode_status = KTD2692_DISABLES_MOVIE_FLASH_MODE;
	spin_lock_irqsave(&global_ktd2692data->int_lock, flags);
	ktd2692_write_data(global_ktd2692data->mode_status\|
	KTD2692_ADDR_MOVIE_FLASHMODE_CONTROL);
	spin_unlock_irqrestore(&global_ktd2692data->int_lock, flags);

	ktd2692_setGpio(0);
	gpio_free(global_ktd2692data->flash_control);
	LED_INFO("KTD2692-FLASH OFF X(%d)\n", state);
	}
	break;
	}

	return ret;
	}

	ssize_t ktd2692_show(struct device *dev,
	struct device_attribute attr, char buf)
	{
	return sprintf(buf, "%d\n", global_ktd2692data->sysfs_input_data);
	}

	static DEVICE_ATTR(rear_flash, S_IRUSR\|S_IWUSR\|S_IRGRP\|S_IWGRP\|S_IROTH,
	ktd2692_show, ktd2692_store);
	static DEVICE_ATTR(rear_torch_flash, S_IRUSR\|S_IWUSR\|S_IRGRP\|S_IWGRP\|S_IROTH,
	ktd2692_show, ktd2692_store);

	static int ktd2692_parse_dt(struct device *dev,
	struct ktd2692_platform_data *pdata)
	{
	struct device_node *dnode = dev->of_node;
	u32 buffer = 0;
	int ret = 0;
	u32 torch_table_enable = 0;

	/* Defulat Value */
	pdata->LVP_Voltage = KTD2692_DISABLE_LVP;
	pdata->flash_timeout = KTD2692_TIMER_1049ms; /* default */
	pdata->min_current_value = KTD2692_MIN_CURRENT_240mA;
	pdata->flash_current_value = KTD2692_FLASH_CURRENT(KTD2692_FLASH_DEFAULT_CURRENT, KTD2692_MAX_CURRENT);
	pdata->movie_current_value = KTD2692_MOVIE_CURRENT(KTD2692_MOVIE_DEFAULT_CURRENT, KTD2692_MAX_CURRENT);
	pdata->factory_current_value = KTD2692_MOVIE_CURRENT(KTD2692_FACTORY_DEFAULT_CURRENT, KTD2692_MAX_CURRENT);
	pdata->torch_current_value = KTD2692_MOVIE_CURRENT(KTD2692_TORCH_DEFAULT_CURRENT, KTD2692_MAX_CURRENT);
	pdata->mode_status = KTD2692_DISABLES_MOVIE_FLASH_MODE;

	/* get gpio */
	pdata->flash_control = of_get_named_gpio(dnode, "flash_control", 0);
	if (!gpio_is_valid(pdata->flash_control)) {
	dev_err(dev, "failed to get flash_control\n");
	return -1;
	}

	/* get max current value */
	if (of_property_read_u32(dnode, "max_current", &buffer) == 0) {
	dev_info(dev, "max_current = <%d>\n",
	buffer);
	pdata->max_current = buffer;
	}

	/* get flash current value */
	if (of_property_read_u32(dnode, "flash_current", &buffer) == 0) {
	dev_info(dev, "flash_current = <%d><%d>\n",
	buffer, KTD2692_FLASH_CURRENT(buffer, pdata->max_current));
	pdata->flash_current_value = KTD2692_FLASH_CURRENT(buffer, pdata->max_current);
	}

	/* get movie current value */
	if (of_property_read_u32(dnode, "movie_current", &buffer) == 0) {
	dev_info(dev, "movie_current = <%d><%d>\n",
	buffer, KTD2692_MOVIE_CURRENT(buffer, pdata->max_current));
	pdata->movie_current_value = KTD2692_MOVIE_CURRENT(buffer, pdata->max_current);
	}

	/* get factory current value */
	if (of_property_read_u32(dnode, "factory_current", &buffer) == 0) {
	dev_info(dev, "factory_current = <%d><%d>\n",
	buffer, KTD2692_MOVIE_CURRENT(buffer, pdata->max_current));
	pdata->factory_current_value = KTD2692_MOVIE_CURRENT(buffer, pdata->max_current);
	}

	/* get torch current value */
	if (of_property_read_u32(dnode, "torch_current", &buffer) == 0) {
	dev_info(dev, "torch_current = <%d><%d>\n",
	buffer, KTD2692_MOVIE_CURRENT(buffer, pdata->max_current));
	pdata->torch_current_value = KTD2692_MOVIE_CURRENT(buffer, pdata->max_current);
	}

	ret = of_property_read_u32(dnode, "torch_table_enable", &torch_table_enable);
	if (ret) {
	pr_info("%s failed to get a torch_table_enable\n", __func__);
	}
	if (torch_table_enable == 1) {
	pdata->torch_table_enable = torch_table_enable;
	ret = of_property_read_u32_array(dnode, "torch_table", pdata->torch_table, TORCH_STEP);
	} else {
	pdata->torch_table_enable = 0;
	}

	return ret;
	}

	static int ktd2692_probe(struct platform_device *pdev)
	{
	struct ktd2692_platform_data *pdata;
	int ret = 0;

	if (pdev->dev.of_node) {
	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
	if (!pdata) {
	dev_err(&pdev->dev, "Failed to allocate memory\n");
	return -ENOMEM;
	}
	ret = ktd2692_parse_dt(&pdev->dev, pdata);
	if (ret < 0) {
	return -EFAULT;
	}
	} else {
	pdata = pdev->dev.platform_data;
	if (pdata == NULL) {
	return -EFAULT;
	}
	}

	global_ktd2692data = pdata;
	global_dev = &pdev->dev;

	LED_INFO("KTD2692_LED Probe\n");

	global_ktd2692data->is_torch_enable = false;

	ktd2692_dev = device_create(camera_class, NULL, 0, NULL, "flash");
	if (IS_ERR(ktd2692_dev)) {
	LED_ERROR("Failed to create device(flash)!\n");
	}

	if (device_create_file(ktd2692_dev, &dev_attr_rear_flash) < 0) {
	LED_ERROR("failed to create device file, %s\n",
	dev_attr_rear_flash.attr.name);
	}
	if (device_create_file(ktd2692_dev, &dev_attr_rear_torch_flash) < 0) {
	LED_ERROR("failed to create device file, %s\n",
	dev_attr_rear_torch_flash.attr.name);
	}

	spin_lock_init(&pdata->int_lock);

	return 0;
	}
	static int ktd2692_remove(struct platform_device *pdev)
	{

	device_remove_file(ktd2692_dev, &dev_attr_rear_flash);
	device_remove_file(ktd2692_dev, &dev_attr_rear_torch_flash);
	device_destroy(camera_class, 0);
	class_destroy(camera_class);

	return 0;
	}

	#ifdef CONFIG_OF
	static struct of_device_id ktd2692_dt_ids[] = {
	{ .compatible = "ktd2692",},
	{},
	};
	/MODULE_DEVICE_TABLE(of, ktd2692_dt_ids);/
	#endif

	static struct platform_driver ktd2692_driver = {
	.driver = {
	.name = ktd2692_NAME,
	.owner = THIS_MODULE,
	#ifdef CONFIG_OF
	.of_match_table = ktd2692_dt_ids,
	#endif
	},
	.probe = ktd2692_probe,
	.remove = ktd2692_remove,
	};

	static int __init ktd2692_init(void)
	{
	return platform_driver_register(&ktd2692_driver);
	}

	static void __exit ktd2692_exit(void)
	{
	platform_driver_unregister(&ktd2692_driver);
	}

	module_init(ktd2692_init);
	module_exit(ktd2692_exit);

	MODULE_AUTHOR("sunggeun yim <sunggeun.yim@samsung.com.com>");
	MODULE_DESCRIPTION("KTD2692 driver");
	MODULE_LICENSE("GPL");