/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Copyright (c) 2021 MediaTek Inc.
*/

#include <linux/interrupt.h>
#include <linux/list.h>
#include <linux/list_sort.h>
#include <linux/dcache.h>
#include <linux/debugfs.h>
#include <linux/platform_device.h>
#include <linux/delay.h>
#include <linux/mutex.h>
#include <linux/pm_wakeup.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/timer.h>
#include <linux/workqueue.h>
#include <linux/of.h>

#include <mt-plat/upmu_common.h>
#include <include/pmic_lbat_service.h>

#define USER_SIZE	16

#define LBAT_SERVICE_DBG 0

static DEFINE_MUTEX(lbat_mutex);
static struct list_head lbat_hv_list = LIST_HEAD_INIT(lbat_hv_list);
static struct list_head lbat_lv_list = LIST_HEAD_INIT(lbat_lv_list);

/* workqueue for SW de-bounce */
static struct workqueue_struct *lbat_wq;

static unsigned int user_count;

enum lbat_thd_type {
	LBAT_HV,
	LBAT_LV,
};

struct lbat_thd_t {
	unsigned int thd_volt;
	struct lbat_user *user;
	struct list_head list;
};

static struct lbat_thd_t *cur_hv_ptr;
static struct lbat_thd_t *cur_lv_ptr;
static struct lbat_user *lbat_user_table[USER_SIZE];

static unsigned int r_ratio[2];

static unsigned int VOLT_TO_RAW(unsigned int volt)
{
	return (volt << 12) / (1800 * r_ratio[0] / r_ratio[1]);
}

static void lbat_max_en_setting(int en_val)
{
	pmic_set_register_value(PMIC_AUXADC_LBAT_DET_MAX, en_val);
	pmic_set_register_value(PMIC_AUXADC_LBAT_IRQ_EN_MAX, en_val);
}

static void lbat_min_en_setting(int en_val)
{
	pmic_set_register_value(PMIC_AUXADC_LBAT_DET_MIN, en_val);
	pmic_set_register_value(PMIC_AUXADC_LBAT_IRQ_EN_MIN, en_val);
}

static void lbat_irq_enable(void)
{
	if (cur_hv_ptr != NULL)
		lbat_max_en_setting(1);
	if (cur_lv_ptr != NULL)
		lbat_min_en_setting(1);
	pmic_set_register_value(PMIC_AUXADC_LBAT_EN, 1);
}

static void lbat_irq_disable(void)
{
	pmic_set_register_value(PMIC_AUXADC_LBAT_EN, 0);
	lbat_max_en_setting(0);
	lbat_min_en_setting(0);
}

static int hv_list_cmp(void *priv, struct list_head *a, struct list_head *b)
{
	struct lbat_thd_t *thd_a, *thd_b;

	thd_a = list_entry(a, struct lbat_thd_t, list);
	thd_b = list_entry(b, struct lbat_thd_t, list);

	return thd_a->thd_volt - thd_b->thd_volt;
}

static int lv_list_cmp(void *priv, struct list_head *a, struct list_head *b)
{
	struct lbat_thd_t *thd_a, *thd_b;

	thd_a = list_entry(a, struct lbat_thd_t, list);
	thd_b = list_entry(b, struct lbat_thd_t, list);

	return thd_b->thd_volt - thd_a->thd_volt;
}

static int modify_lbat_list(enum lbat_thd_type type,
	struct lbat_thd_t *thd)
{
	if (!thd)
		return -EINVAL;
	switch (type) {
	case LBAT_HV:
		list_move(&thd->list, &lbat_hv_list);
		list_sort(NULL, &lbat_hv_list, hv_list_cmp);
		thd = list_first_entry(&lbat_hv_list,
				struct lbat_thd_t, list);
		if (cur_hv_ptr != thd) {
			cur_hv_ptr = thd;
			pmic_set_register_value(PMIC_AUXADC_LBAT_VOLT_MAX,
				VOLT_TO_RAW(cur_hv_ptr->thd_volt));
		}
		break;
	case LBAT_LV:
		list_move(&thd->list, &lbat_lv_list);
		list_sort(NULL, &lbat_lv_list, lv_list_cmp);
		thd = list_first_entry(&lbat_lv_list,
				struct lbat_thd_t, list);
		if (cur_lv_ptr != thd) {
			cur_lv_ptr = thd;
			pmic_set_register_value(PMIC_AUXADC_LBAT_VOLT_MIN,
				VOLT_TO_RAW(cur_lv_ptr->thd_volt));
		}
		break;
	}
	return 0;
}

static inline int list_is_first(const struct list_head *list,
				const struct list_head *head)
{
	return list->prev == head;
}

/*
 * After execute lbat_user's callback, set next thd node to wait event
 */
static void lbat_hv_set_next_thd(struct lbat_user *user, struct lbat_thd_t *thd)
{
	/* restore user->thd_list */
	list_move(&thd->list, &user->thd_list);
	list_sort(NULL, &user->thd_list, lv_list_cmp);
	/* HV is triggered */
	if (!list_is_first(&thd->list, &user->thd_list)) /* Not first */
		modify_lbat_list(LBAT_HV, list_prev_entry(thd, list));
	if (!list_is_last(&thd->list, &user->thd_list)) /* Not last */
		modify_lbat_list(LBAT_LV, list_next_entry(thd, list));
}

static void lbat_lv_set_next_thd(struct lbat_user *user, struct lbat_thd_t *thd)
{
	/* restore user->thd_list */
	list_move(&thd->list, &user->thd_list);
	list_sort(NULL, &user->thd_list, lv_list_cmp);
	/* LV is triggered */
	if (!list_is_first(&thd->list, &user->thd_list)) /* Not first */
		modify_lbat_list(LBAT_HV, list_prev_entry(thd, list));
	if (!list_is_last(&thd->list, &user->thd_list)) /* Not last */
		modify_lbat_list(LBAT_LV, list_next_entry(thd, list));
}

static void lbat_set_next_thd(struct lbat_user *user, struct lbat_thd_t *thd)
{
	if (thd == user->hv_thd) {
		modify_lbat_list(LBAT_LV, user->lv1_thd);
		if (!list_empty(&user->lv2_thd->list))
			list_del_init(&user->lv2_thd->list);
	} else if (thd == user->lv1_thd) {
		modify_lbat_list(LBAT_HV, user->hv_thd);
		if (list_empty(&user->lv2_thd->list))
			modify_lbat_list(LBAT_LV, user->lv2_thd);
	}
}

/*
 * Execute user's callback and set its next threshold if reach deb_times,
 * otherwise ignore this event and reset lbat_list
 */
// workaround for mt6877
static void lbat_deb_handler(struct work_struct *work)
{
	enum lbat_thd_type type;
	unsigned int deb_times;
	struct lbat_user *user =
		container_of(work, struct lbat_user, deb_work);

	mutex_lock(&lbat_mutex);
	if (user->deb_thd_ptr == user->hv_thd) {
		type = LBAT_HV;
		deb_times = user->hv_deb_times;
	} else {
		type = LBAT_LV;
		deb_times = user->lv_deb_times;
	}
	if (user->deb_cnt >= deb_times) {
		/* execute user's callback after de-bounce */
		user->callback(user->deb_thd_ptr->thd_volt);
		lbat_set_next_thd(user, user->deb_thd_ptr);
	} else {
		/* ignore this event and reset lbat_list */
		modify_lbat_list(type, user->deb_thd_ptr);
	}
	/* de-bounce done, reset deb_cnt and deb_thd_ptr */
	user->deb_cnt = 0;
	user->deb_thd_ptr = NULL;
	lbat_irq_disable();
	udelay(200);
	lbat_irq_enable();
	mutex_unlock(&lbat_mutex);
}

//static void lbat_timer_func(unsigned long data)
static void lbat_timer_func(struct timer_list *t)
{
	unsigned int deb_prd = 0;
	unsigned int deb_times = 0;
//	struct lbat_user *user = (struct lbat_user *)data;
	struct lbat_user *user =  from_timer(user, t, deb_timer);

	if (user->deb_thd_ptr == user->hv_thd) {
		/* LBAT user HV de-bounce */
		if (lbat_read_volt() < user->deb_thd_ptr->thd_volt) {
			/* queue deb_work to reset lbat_list */
			goto wq_handler;
		}
		deb_prd = user->hv_deb_prd;
		deb_times = user->hv_deb_times;
	} else if (user->deb_thd_ptr == user->lv1_thd ||
		   user->deb_thd_ptr == user->lv2_thd) {
		/* LBAT user LV de-bounce */
		if (lbat_read_volt() > user->deb_thd_ptr->thd_volt) {
			/* queue deb_work to reset lbat_list */
			goto wq_handler;
		}
		deb_prd = user->lv_deb_prd;
		deb_times = user->lv_deb_times;
	} else {
		pr_notice("[%s] LBAT de-bounce threshold not match\n",
			__func__);
		return;
	}
	user->deb_cnt++;
#if LBAT_SERVICE_DBG
	pr_info("[%s] name:%s, thd_volt:%d, de-bounce times:%d\n",
		__func__, user->name,
		user->deb_thd_ptr->thd_volt, user->deb_cnt);
#endif
	if (user->deb_cnt < deb_times) {
		mod_timer(&user->deb_timer,
			jiffies + msecs_to_jiffies(deb_prd));
		return;
	}
wq_handler:
	/* queue deb_work to execute user's callback or reset lbat_list */
	queue_work(lbat_wq, &user->deb_work);
}

static void lbat_user_init_timer(struct lbat_user *user)
{
	user->deb_cnt = 0;
	user->hv_deb_prd = 0;
	user->hv_deb_times = 0;
	user->lv_deb_prd = 0;
	user->lv_deb_times = 0;
	//init_timer(&user->deb_timer);
	//user->deb_timer.data = (unsigned long)user;
	//user->deb_timer.expires = 0;
	//user->deb_timer.function = lbat_timer_func;
	timer_setup(&user->deb_timer, lbat_timer_func, 0);
}

static int lbat_user_update(struct lbat_user *user)
{
	struct lbat_thd_t *thd;
	/*
	 * add lv_thd to lbat_lv_list
	 * and assign first entry of lv_list to cur_lv_ptr
	 */
	if (list_empty(&user->thd_list))
		thd = user->lv1_thd;
	else {
		thd = list_first_entry(&user->thd_list,
				       struct lbat_thd_t, list);
		thd = list_next_entry(thd, list);
	}
	modify_lbat_list(LBAT_LV, thd);
	if (user_count == 0)
		lbat_irq_enable();
	lbat_user_table[user_count++] = user;

	return 0;
}

static struct lbat_thd_t *lbat_thd_init(unsigned int thd_volt,
	struct lbat_user *user)
{
	struct lbat_thd_t *thd = NULL;

	if (thd_volt == 0)
		return NULL;
	thd = kzalloc(sizeof(*thd), GFP_KERNEL);
	if (thd == NULL)
		return NULL;
	thd->thd_volt = thd_volt;
	thd->user = user;
	INIT_LIST_HEAD(&thd->list);
	return thd;
}

struct lbat_user *lbat_user_register_ext(const char *name,
	unsigned int *thd_volt_arr, unsigned int thd_volt_size,
	void (*callback)(unsigned int thd_volt))
{
	int i, ret;
	struct lbat_thd_t *thd;
	struct lbat_user *user;

	mutex_lock(&lbat_mutex);
	user = kzalloc(sizeof(*user), GFP_KERNEL);
	if (user == NULL) {
		ret = -10;
		goto out;
	}
	strncpy(user->name, name, ARRAY_SIZE(user->name) - 1);
	if (thd_volt_arr[0] >= 5400 || thd_volt_arr[thd_volt_size - 1] <= 2000) {
		ret = -EINVAL;
		goto out;
	} else if (callback == NULL) {
		ret = -EINVAL;
		goto out;
	}
	INIT_LIST_HEAD(&user->thd_list);
	thd = lbat_thd_init(thd_volt_arr[0], user);
	for (i = 0; i < thd_volt_size; i++) {
		thd = lbat_thd_init(thd_volt_arr[i], user);
		list_add_tail(&thd->list, &user->thd_list);
	}
	user->callback = callback;
	lbat_user_init_timer(user);
	INIT_WORK(&user->deb_work, lbat_deb_handler);
	pr_info("[%s] name=%s, thd_volt_max=%d, thd_volt_min=%d\n", __func__,
		user->name, thd_volt_arr[0], thd_volt_arr[thd_volt_size - 1]);
	ret = lbat_user_update(user);
out:
	if (ret)
		pr_notice("[%s] error ret=%d\n", __func__, ret);
	mutex_unlock(&lbat_mutex);
	return user;
}
EXPORT_SYMBOL(lbat_user_register_ext);

struct lbat_user *lbat_user_register(const char *name,
	unsigned int hv_thd_volt,
	unsigned int lv1_thd_volt, unsigned int lv2_thd_volt,
	void (*callback)(unsigned int thd_volt))
{
	int ret = 0;
	struct lbat_user *user;

	mutex_lock(&lbat_mutex);
	user = kzalloc(sizeof(*user), GFP_KERNEL);
	if (user == NULL) {
		ret = -10;
		goto out;
	}	

	strncpy(user->name, name, ARRAY_SIZE(user->name) - 1);
	if (hv_thd_volt >= 5400 || lv1_thd_volt <= 2650) {
		ret = -11;
		goto out;
	} else if (hv_thd_volt < lv1_thd_volt ||
			   lv1_thd_volt < lv2_thd_volt) {
		ret = -12;
		goto out;
	} else if (callback == NULL) {
		ret = -13;
		goto out;
	}
	INIT_LIST_HEAD(&user->thd_list);
	user->hv_thd = lbat_thd_init(hv_thd_volt, user);
	user->lv1_thd = lbat_thd_init(lv1_thd_volt, user);
	user->lv2_thd = lbat_thd_init(lv2_thd_volt, user);
	user->callback = callback;
	lbat_user_init_timer(user);
	INIT_WORK(&user->deb_work, lbat_deb_handler);
	pr_info("[%s] name=%s, hv=%d, lv1=%d, lv2=%d\n",
		__func__, name, hv_thd_volt, lv1_thd_volt, lv2_thd_volt);
	ret = lbat_user_update(user);
out:
	if (ret)
		pr_notice("[%s] error ret=%d\n", __func__, ret);
	mutex_unlock(&lbat_mutex);
	return user;
}
EXPORT_SYMBOL(lbat_user_register);

int lbat_user_set_debounce(struct lbat_user *user,
	unsigned int hv_deb_prd, unsigned int hv_deb_times,
	unsigned int lv_deb_prd, unsigned int lv_deb_times)
{
	if (IS_ERR(user))
		return PTR_ERR(user);
	user->hv_deb_prd = hv_deb_prd;
	user->hv_deb_times = hv_deb_times;
	user->lv_deb_prd = lv_deb_prd;
	user->lv_deb_times = lv_deb_times;
	return 0;
}
EXPORT_SYMBOL(lbat_user_set_debounce);

static irqreturn_t bat_h_int_handler(int irq, void *data)
{
	struct lbat_user *user = NULL;

	if (cur_hv_ptr == NULL) {
		lbat_max_en_setting(0);
		return IRQ_NONE;
	}
	mutex_lock(&lbat_mutex);
	pr_info("[%s] cur_thd_volt=%d\n", __func__, cur_hv_ptr->thd_volt);

	user = cur_hv_ptr->user;
	list_del_init(&cur_hv_ptr->list);
	if (user->hv_deb_times) {
		user->deb_cnt = 0;
		user->deb_thd_ptr = cur_hv_ptr;
		mod_timer(&user->deb_timer,
			jiffies + msecs_to_jiffies(user->hv_deb_prd));
	} else {
		user->callback(cur_hv_ptr->thd_volt);
		if (list_empty(&user->thd_list))
			lbat_set_next_thd(user, cur_hv_ptr);
		else
			lbat_hv_set_next_thd(user, cur_hv_ptr);
	}

	/* Since cur_hv_ptr is removed, assign new thd for cur_hv_ptr */
	if (list_empty(&lbat_hv_list)) {
		cur_hv_ptr = NULL;
		goto out;
	}
	cur_hv_ptr = list_first_entry(
			&lbat_hv_list, struct lbat_thd_t, list);
	pmic_set_register_value(PMIC_AUXADC_LBAT_VOLT_MAX,
		VOLT_TO_RAW(cur_hv_ptr->thd_volt));
out:
	lbat_irq_disable();
	udelay(200);
	lbat_irq_enable();
	mutex_unlock(&lbat_mutex);
	return IRQ_HANDLED;
}

static irqreturn_t bat_l_int_handler(int irq, void *data)
{
	struct lbat_user *user = NULL;

	if (cur_lv_ptr == NULL) {
		lbat_min_en_setting(0);
		return IRQ_NONE;
	}
	mutex_lock(&lbat_mutex);
	pr_info("[%s] cur_thd_volt=%d\n", __func__, cur_lv_ptr->thd_volt);

	user = cur_lv_ptr->user;
	list_del_init(&cur_lv_ptr->list);
	if (user->lv_deb_times) {
		user->deb_cnt = 0;
		user->deb_thd_ptr = cur_lv_ptr;
		mod_timer(&user->deb_timer,
			jiffies + msecs_to_jiffies(user->lv_deb_prd));
	} else {
		user->callback(cur_lv_ptr->thd_volt);
		if (list_empty(&user->thd_list))
			lbat_set_next_thd(user, cur_lv_ptr);
		else
			lbat_lv_set_next_thd(user, cur_lv_ptr);
	}

	/* Since cur_lv_ptr is removed, assign new thd for cur_lv_ptr */
	if (list_empty(&lbat_lv_list)) {
		cur_lv_ptr = NULL;
		goto out;
	}
	cur_lv_ptr = list_first_entry(
			&lbat_lv_list, struct lbat_thd_t, list);
	pmic_set_register_value(PMIC_AUXADC_LBAT_VOLT_MIN,
		VOLT_TO_RAW(cur_lv_ptr->thd_volt));
out:
	lbat_irq_disable();
	udelay(200);
	lbat_irq_enable();
	mutex_unlock(&lbat_mutex);
	return IRQ_HANDLED;
}

void lbat_suspend(void)
{
	lbat_irq_disable();
}

void lbat_resume(void)
{
	lbat_irq_enable();
}

int lbat_service_init(struct platform_device *pdev)
{
	int ret = 0;
	struct device_node *np = NULL;

	pr_info("[%s]\n", __func__);
	/* Selects debounce as 8 */
	pmic_set_register_value(PMIC_AUXADC_LBAT_DEBT_MAX_SEL, 3);
	/* Selects debounce as 1 */
	pmic_set_register_value(PMIC_AUXADC_LBAT_DEBT_MIN_SEL, 0);
	/* Set LBAT_PRD as 15ms */
	pmic_set_register_value(PMIC_AUXADC_LBAT_DET_PRD_SEL, 0);

	ret = devm_request_threaded_irq(&pdev->dev,
		platform_get_irq_byname(pdev, "bat_h"),
		NULL, bat_h_int_handler, IRQF_TRIGGER_NONE,
		"bat_h", NULL);
	if (ret < 0)
		dev_notice(&pdev->dev, "request bat_h irq fail\n");
	ret = devm_request_threaded_irq(&pdev->dev,
		platform_get_irq_byname(pdev, "bat_l"),
		NULL, bat_l_int_handler, IRQF_TRIGGER_NONE,
		"bat_l", NULL);
	if (ret < 0)
		dev_notice(&pdev->dev, "request bat_l irq fail\n");

	lbat_wq = create_singlethread_workqueue("lbat_service");

	/* get LBAT r_ratio */
	np = of_find_node_by_name(NULL, "batadc");
	if (!np) {
		pr_notice("[%s] get batadc node fail\n", __func__);
		r_ratio[0] = 7;
		r_ratio[1] = 2;
		return 0;
	}
	ret = of_property_read_u32_array(np, "resistance-ratio", r_ratio, 2);
	pr_info("[%s] r_ratio = %d/%d\n", __func__, r_ratio[0], r_ratio[1]);

	return ret;
}

unsigned int lbat_read_raw(void)
{
	return pmic_get_register_value(PMIC_AUXADC_ADC_OUT_LBAT);
}

unsigned int lbat_read_volt(void)
{
	unsigned int raw_data = lbat_read_raw();

	return (raw_data * 1800 * r_ratio[0] / r_ratio[1]) >> 12;
}

/*
 * Lbat service debug
 */
void lbat_dump_reg(void)
{
	pr_notice("AUXADC_LBAT_VOLT_MAX = 0x%x, AUXADC_LBAT_VOLT_MIN = 0x%x, RG_INT_EN_BAT_H = %d, RG_INT_EN_BAT_L = %d\n"
		, pmic_get_register_value(PMIC_AUXADC_LBAT_VOLT_MAX)
		, pmic_get_register_value(PMIC_AUXADC_LBAT_VOLT_MIN)
		, pmic_get_register_value(PMIC_RG_INT_EN_BAT_H)
		, pmic_get_register_value(PMIC_RG_INT_EN_BAT_L));
	pr_notice("AUXADC_LBAT_EN = %d, AUXADC_LBAT_DET_MAX = %d, AUXADC_LBAT_IRQ_EN_MAX = %d, AUXADC_LBAT_DET_MIN = %d, AUXADC_LBAT_IRQ_EN_MIN = %d\n"
		, pmic_get_register_value(PMIC_AUXADC_LBAT_EN)
		, pmic_get_register_value(PMIC_AUXADC_LBAT_DET_MAX)
		, pmic_get_register_value(PMIC_AUXADC_LBAT_IRQ_EN_MAX)
		, pmic_get_register_value(PMIC_AUXADC_LBAT_DET_MIN)
		, pmic_get_register_value(PMIC_AUXADC_LBAT_IRQ_EN_MIN));
	pr_notice("AUXADC_LBAT_DEBT_MAX_SEL=%d, AUXADC_LBAT_DEBT_MIN_SEL=%d\n"
		, pmic_get_register_value(PMIC_AUXADC_LBAT_DEBT_MAX_SEL)
		, pmic_get_register_value(PMIC_AUXADC_LBAT_DEBT_MIN_SEL));
}

static void lbat_dump_thd_list(struct seq_file *s)
{
	unsigned int len = 0;
	char str[128] = "";
	struct lbat_thd_t *thd = NULL;

	if (list_empty(&lbat_hv_list) && list_empty(&lbat_lv_list)) {
		pr_notice("[%s] no entry in lbat list\n", __func__);
		seq_puts(s, "no entry in lbat list\n");
		return;
	}
	mutex_lock(&lbat_mutex);
	list_for_each_entry(thd, &lbat_hv_list, list) {
		len += snprintf(str + len, sizeof(str) - len,
			"%shv_list, thd_volt:%d, user:%s\n",
			(thd == cur_hv_ptr ||
			 thd == cur_lv_ptr) ? "->" : "  ",
			thd->thd_volt, thd->user->name);
		pr_notice("%s", str);
		seq_printf(s, "%s", str);
		strncpy(str, "", strlen(str));
		len = 0;
	}
	pr_notice("\n");
	seq_puts(s, "\n");

	list_for_each_entry(thd, &lbat_lv_list, list) {
		len += snprintf(str + len, sizeof(str) - len,
			"%slv_list, thd_volt:%d, user:%s\n",
			(thd == cur_hv_ptr ||
			 thd == cur_lv_ptr) ? "->" : "  ",
			thd->thd_volt, thd->user->name);
		pr_notice("%s", str);
		seq_printf(s, "%s", str);
		strncpy(str, "", strlen(str));
		len = 0;
	}
	pr_notice("\n");
	mutex_unlock(&lbat_mutex);
}

static void lbat_dbg_dump_reg(struct seq_file *s)
{
	lbat_dump_reg();
	seq_printf(s, "AUXADC_LBAT_VOLT_MAX = 0x%x\n",
		pmic_get_register_value(PMIC_AUXADC_LBAT_VOLT_MAX));
	seq_printf(s, "AUXADC_LBAT_VOLT_MIN = 0x%x\n",
		pmic_get_register_value(PMIC_AUXADC_LBAT_VOLT_MIN));
	seq_printf(s, "RG_INT_EN_BAT_H = 0x%x\n",
		pmic_get_register_value(PMIC_RG_INT_EN_BAT_H));
	seq_printf(s, "RG_INT_EN_BAT_L = 0x%x\n",
		pmic_get_register_value(PMIC_RG_INT_EN_BAT_L));
	seq_printf(s, "AUXADC_LBAT_EN = 0x%x\n",
		pmic_get_register_value(PMIC_AUXADC_LBAT_EN));
	seq_printf(s, "AUXADC_LBAT_DET_MAX = 0x%x\n",
		pmic_get_register_value(PMIC_AUXADC_LBAT_DET_MAX));
	seq_printf(s, "AUXADC_LBAT_IRQ_EN_MAX = 0x%x\n",
		pmic_get_register_value(PMIC_AUXADC_LBAT_IRQ_EN_MAX));
	seq_printf(s, "AUXADC_LBAT_DET_MIN = 0x%x\n",
		pmic_get_register_value(PMIC_AUXADC_LBAT_DET_MIN));
	seq_printf(s, "AUXADC_LBAT_IRQ_EN_MIN = 0x%x\n",
		pmic_get_register_value(PMIC_AUXADC_LBAT_IRQ_EN_MIN));
	seq_printf(s, "AUXADC_LBAT_DEBT_MAX_SEL = 0x%x\n",
		pmic_get_register_value(PMIC_AUXADC_LBAT_DEBT_MAX_SEL));
	seq_printf(s, "AUXADC_LBAT_DEBT_MIN_SEL = 0x%x\n",
		pmic_get_register_value(PMIC_AUXADC_LBAT_DEBT_MIN_SEL));
	seq_printf(s, "AUXADC_ADC_RDY_LBAT = 0x%x\n",
		pmic_get_register_value(PMIC_AUXADC_ADC_RDY_LBAT));
	seq_printf(s, "AUXADC_ADC_OUT_LBAT = 0x%x\n",
		pmic_get_register_value(PMIC_AUXADC_ADC_OUT_LBAT));
}

static void lbat_dump_user_table(struct seq_file *s)
{
	unsigned int i = 0;
	struct lbat_user *user = NULL;
	struct lbat_thd_t *thd = NULL;

	mutex_lock(&lbat_mutex);
	for (i = 0; i < user_count; i++) {
		user = lbat_user_table[i];
		if (list_empty(&user->thd_list)) {
			seq_printf(s,
				"%2d:%20s, %d, %d, %d, (%d,%d,%d,%d), %pf\n",
				i, user->name,
				user->hv_thd->thd_volt,
				user->lv1_thd->thd_volt,
				user->lv2_thd->thd_volt,
				user->hv_deb_prd, user->hv_deb_times,
				user->lv_deb_prd, user->lv_deb_times,
				user->callback);
		} else {
			seq_printf(s, "%2d:%20s,", i, user->name);
			list_for_each_entry(thd, &user->thd_list, list) {
				seq_printf(s, " %d,", thd->thd_volt);
			}
			seq_printf(s, " %pf\n",	user->callback);
		}
	}
	mutex_unlock(&lbat_mutex);
}

struct lbat_dbg_st {
	unsigned int dbg_id;
};

enum {
	LBAT_DBG_DUMP_LIST,
	LBAT_DBG_DUMP_REG,
	LBAT_DBG_DUMP_TABLE,
	LBAT_DBG_MAX,
};

static struct lbat_dbg_st dbg_data[LBAT_DBG_MAX];

static int lbat_dbg_show(struct seq_file *s, void *unused)
{
	struct lbat_dbg_st *dbg_st = s->private;

	switch (dbg_st->dbg_id) {
	case LBAT_DBG_DUMP_LIST:
		lbat_dump_thd_list(s);
		break;
	case LBAT_DBG_DUMP_REG:
		lbat_dbg_dump_reg(s);
		break;
	case LBAT_DBG_DUMP_TABLE:
		lbat_dump_user_table(s);
		break;
	default:
		break;
	}
	return 0;
}

static int lbat_dbg_open(struct inode *inode, struct file *file)
{
	if (file->f_mode & FMODE_READ)
		return single_open(file, lbat_dbg_show, inode->i_private);
	file->private_data = inode->i_private;
	return 0;
}

static ssize_t lbat_dbg_write(struct file *file,
	const char __user *user_buffer, size_t count, loff_t *position)
{
	return count;
}

static int lbat_dbg_release(struct inode *inode, struct file *file)
{
	if (file->f_mode & FMODE_READ)
		return single_release(inode, file);
	return 0;
}

static const struct file_operations lbat_dbg_fops = {
	.open = lbat_dbg_open,
	.read = seq_read,
	.write = lbat_dbg_write,
	.llseek  = seq_lseek,
	.release = lbat_dbg_release,
};

int lbat_debug_init(struct dentry *debug_dir)
{
	struct dentry *lbat_dbg_dir = NULL;

	if (IS_ERR(debug_dir) || !debug_dir) {
		pr_notice("dir mtk_pmic does not exist\n");
		return -1;
	}
	lbat_dbg_dir = debugfs_create_dir("lbat_dbg", debug_dir);
	if (IS_ERR(lbat_dbg_dir) || !lbat_dbg_dir) {
		pr_notice("fail mkdir /sys/kernel/debug/mtk_pmic/lbat_dbg\n");
		return -1;
	}
	/* lbat service debug init */
	dbg_data[0].dbg_id = LBAT_DBG_DUMP_LIST;
	/* file type is regular file(S_IFREG), permission is read(444) */
	debugfs_create_file("lbat_dump_list", (S_IFREG | 0444),
		lbat_dbg_dir, (void *)&dbg_data[0], &lbat_dbg_fops);

	dbg_data[1].dbg_id = LBAT_DBG_DUMP_REG;
	debugfs_create_file("lbat_dump_reg", (S_IFREG | 0444),
		lbat_dbg_dir, (void *)&dbg_data[1], &lbat_dbg_fops);

	dbg_data[2].dbg_id = LBAT_DBG_DUMP_TABLE;
	debugfs_create_file("lbat_dump_table", (S_IFREG | 0444),
		lbat_dbg_dir, (void *)&dbg_data[2], &lbat_dbg_fops);

	return 0;
}