// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2023 Richtek Technology Corp.
 *
 * Authors:
 *   ChiYuan Huang <cy_huang@richtek.com>
 *   Alice Chen <alice_chen@richtek.com>
 */

#include <linux/bitfield.h>
#include <linux/bitops.h>
#include <linux/kernel.h>
#include <linux/leds.h>
#include <linux/led-class-multicolor.h>
#include <linux/linear_range.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/platform_device.h>
#include <linux/property.h>
#include <linux/regmap.h>
#include <linux/util_macros.h>

#include <asm/unaligned.h>

enum {
	MT6370_LED_ISNK1 = 0,
	MT6370_LED_ISNK2,
	MT6370_LED_ISNK3,
	MT6370_LED_ISNK4,
	MT6370_MAX_LEDS
};

enum mt6370_led_mode {
	MT6370_LED_PWM_MODE = 0,
	MT6370_LED_BREATH_MODE,
	MT6370_LED_REG_MODE,
	MT6370_LED_MAX_MODE
};

enum mt6370_led_field {
	F_RGB_EN = 0,
	F_CHGIND_EN,
	F_LED1_CURR,
	F_LED2_CURR,
	F_LED3_CURR,
	F_LED4_CURR,
	F_LED1_MODE,
	F_LED2_MODE,
	F_LED3_MODE,
	F_LED4_MODE,
	F_LED1_DUTY,
	F_LED2_DUTY,
	F_LED3_DUTY,
	F_LED4_DUTY,
	F_LED1_FREQ,
	F_LED2_FREQ,
	F_LED3_FREQ,
	F_LED4_FREQ,
	F_MAX_FIELDS
};

enum mt6370_led_ranges {
	R_LED123_CURR = 0,
	R_LED4_CURR,
	R_LED_TRFON,
	R_LED_TOFF,
	R_MAX_RANGES
};

enum mt6370_pattern {
	P_LED_TR1 = 0,
	P_LED_TR2,
	P_LED_TF1,
	P_LED_TF2,
	P_LED_TON,
	P_LED_TOFF,
	P_MAX_PATTERNS
};

#define MT6370_REG_DEV_INFO			0x100
#define MT6370_REG_RGB1_DIM			0x182
#define MT6370_REG_RGB2_DIM			0x183
#define MT6370_REG_RGB3_DIM			0x184
#define MT6370_REG_RGB_EN			0x185
#define MT6370_REG_RGB1_ISNK			0x186
#define MT6370_REG_RGB2_ISNK			0x187
#define MT6370_REG_RGB3_ISNK			0x188
#define MT6370_REG_RGB1_TR			0x189
#define MT6370_REG_RGB_CHRIND_DIM		0x192
#define MT6370_REG_RGB_CHRIND_CTRL		0x193
#define MT6370_REG_RGB_CHRIND_TR		0x194

#define MT6372_REG_RGB_EN			0x182
#define MT6372_REG_RGB1_ISNK			0x183
#define MT6372_REG_RGB2_ISNK			0x184
#define MT6372_REG_RGB3_ISNK			0x185
#define MT6372_REG_RGB4_ISNK			0x186
#define MT6372_REG_RGB1_DIM			0x187
#define MT6372_REG_RGB2_DIM			0x188
#define MT6372_REG_RGB3_DIM			0x189
#define MT6372_REG_RGB4_DIM			0x18A
#define MT6372_REG_RGB12_FREQ			0x18B
#define MT6372_REG_RGB34_FREQ			0x18C
#define MT6372_REG_RGB1_TR			0x18D

#define MT6370_VENDOR_ID_MASK			GENMASK(7, 4)
#define MT6372_VENDOR_ID			0x9
#define MT6372C_VENDOR_ID			0xb
#define MT6370_CHEN_BIT(id)			BIT(MT6370_LED_ISNK4 - id)
#define MT6370_VIRTUAL_MULTICOLOR		5
#define MC_CHANNEL_NUM				3
#define MT6370_PWM_DUTY				(BIT(5) - 1)
#define MT6372_PWM_DUTY				(BIT(8) - 1)

struct mt6370_led {
	/*
	 * If the color of the LED in DT is set to
	 *   - 'LED_COLOR_ID_RGB'
	 *   - 'LED_COLOR_ID_MULTI'
	 * The member 'index' of this struct will be set to
	 * 'MT6370_VIRTUAL_MULTICOLOR'.
	 * If so, this LED will choose 'struct led_classdev_mc mc' to use.
	 * Instead, if the member 'index' of this struct is set to
	 * 'MT6370_LED_ISNK1' ~ 'MT6370_LED_ISNK4', then this LED will choose
	 * 'struct led_classdev isink' to use.
	 */
	union {
		struct led_classdev isink;
		struct led_classdev_mc mc;
	};
	struct mt6370_priv *priv;
	enum led_default_state default_state;
	u32 index;
};

struct mt6370_pdata {
	const unsigned int *tfreq;
	unsigned int tfreq_len;
	u16 reg_rgb1_tr;
	s16 reg_rgb_chrind_tr;
	u8 pwm_duty;
};

struct mt6370_priv {
	/* Per LED access lock */
	struct mutex lock;
	struct regmap *regmap;
	struct regmap_field *fields[F_MAX_FIELDS];
	const struct reg_field *reg_fields;
	const struct linear_range *ranges;
	struct reg_cfg *reg_cfgs;
	const struct mt6370_pdata *pdata;
	unsigned int leds_count;
	unsigned int leds_active;
	struct mt6370_led leds[] __counted_by(leds_count);
};

static const struct reg_field common_reg_fields[F_MAX_FIELDS] = {
	[F_RGB_EN]	= REG_FIELD(MT6370_REG_RGB_EN, 4, 7),
	[F_CHGIND_EN]	= REG_FIELD(MT6370_REG_RGB_CHRIND_DIM, 7, 7),
	[F_LED1_CURR]	= REG_FIELD(MT6370_REG_RGB1_ISNK, 0, 2),
	[F_LED2_CURR]	= REG_FIELD(MT6370_REG_RGB2_ISNK, 0, 2),
	[F_LED3_CURR]	= REG_FIELD(MT6370_REG_RGB3_ISNK, 0, 2),
	[F_LED4_CURR]	= REG_FIELD(MT6370_REG_RGB_CHRIND_CTRL, 0, 1),
	[F_LED1_MODE]	= REG_FIELD(MT6370_REG_RGB1_DIM, 5, 6),
	[F_LED2_MODE]	= REG_FIELD(MT6370_REG_RGB2_DIM, 5, 6),
	[F_LED3_MODE]	= REG_FIELD(MT6370_REG_RGB3_DIM, 5, 6),
	[F_LED4_MODE]	= REG_FIELD(MT6370_REG_RGB_CHRIND_DIM, 5, 6),
	[F_LED1_DUTY]	= REG_FIELD(MT6370_REG_RGB1_DIM, 0, 4),
	[F_LED2_DUTY]	= REG_FIELD(MT6370_REG_RGB2_DIM, 0, 4),
	[F_LED3_DUTY]	= REG_FIELD(MT6370_REG_RGB3_DIM, 0, 4),
	[F_LED4_DUTY]	= REG_FIELD(MT6370_REG_RGB_CHRIND_DIM, 0, 4),
	[F_LED1_FREQ]	= REG_FIELD(MT6370_REG_RGB1_ISNK, 3, 5),
	[F_LED2_FREQ]	= REG_FIELD(MT6370_REG_RGB2_ISNK, 3, 5),
	[F_LED3_FREQ]	= REG_FIELD(MT6370_REG_RGB3_ISNK, 3, 5),
	[F_LED4_FREQ]	= REG_FIELD(MT6370_REG_RGB_CHRIND_CTRL, 2, 4),
};

static const struct reg_field mt6372_reg_fields[F_MAX_FIELDS] = {
	[F_RGB_EN]	= REG_FIELD(MT6372_REG_RGB_EN, 4, 7),
	[F_CHGIND_EN]	= REG_FIELD(MT6372_REG_RGB_EN, 3, 3),
	[F_LED1_CURR]	= REG_FIELD(MT6372_REG_RGB1_ISNK, 0, 3),
	[F_LED2_CURR]	= REG_FIELD(MT6372_REG_RGB2_ISNK, 0, 3),
	[F_LED3_CURR]	= REG_FIELD(MT6372_REG_RGB3_ISNK, 0, 3),
	[F_LED4_CURR]	= REG_FIELD(MT6372_REG_RGB4_ISNK, 0, 3),
	[F_LED1_MODE]	= REG_FIELD(MT6372_REG_RGB1_ISNK, 6, 7),
	[F_LED2_MODE]	= REG_FIELD(MT6372_REG_RGB2_ISNK, 6, 7),
	[F_LED3_MODE]	= REG_FIELD(MT6372_REG_RGB3_ISNK, 6, 7),
	[F_LED4_MODE]	= REG_FIELD(MT6372_REG_RGB4_ISNK, 6, 7),
	[F_LED1_DUTY]	= REG_FIELD(MT6372_REG_RGB1_DIM, 0, 7),
	[F_LED2_DUTY]	= REG_FIELD(MT6372_REG_RGB2_DIM, 0, 7),
	[F_LED3_DUTY]	= REG_FIELD(MT6372_REG_RGB3_DIM, 0, 7),
	[F_LED4_DUTY]	= REG_FIELD(MT6372_REG_RGB4_DIM, 0, 7),
	[F_LED1_FREQ]	= REG_FIELD(MT6372_REG_RGB12_FREQ, 5, 7),
	[F_LED2_FREQ]	= REG_FIELD(MT6372_REG_RGB12_FREQ, 2, 4),
	[F_LED3_FREQ]	= REG_FIELD(MT6372_REG_RGB34_FREQ, 5, 7),
	[F_LED4_FREQ]	= REG_FIELD(MT6372_REG_RGB34_FREQ, 2, 4),
};

/* Current unit: microamp, time unit: millisecond */
static const struct linear_range common_led_ranges[R_MAX_RANGES] = {
	[R_LED123_CURR]	= { 4000, 1, 6, 4000 },
	[R_LED4_CURR]	= { 2000, 1, 3, 2000 },
	[R_LED_TRFON]	= { 125, 0, 15, 200 },
	[R_LED_TOFF]	= { 250, 0, 15, 400 },
};

static const struct linear_range mt6372_led_ranges[R_MAX_RANGES] = {
	[R_LED123_CURR]	= { 2000, 1, 14, 2000 },
	[R_LED4_CURR]	= { 2000, 1, 14, 2000 },
	[R_LED_TRFON]	= { 125, 0, 15, 250 },
	[R_LED_TOFF]	= { 250, 0, 15, 500 },
};

static const unsigned int common_tfreqs[] = {
	10000, 5000, 2000, 1000, 500, 200, 5, 1,
};

static const unsigned int mt6372_tfreqs[] = {
	8000, 4000, 2000, 1000, 500, 250, 8, 4,
};

static const struct mt6370_pdata common_pdata = {
	.tfreq = common_tfreqs,
	.tfreq_len = ARRAY_SIZE(common_tfreqs),
	.pwm_duty = MT6370_PWM_DUTY,
	.reg_rgb1_tr = MT6370_REG_RGB1_TR,
	.reg_rgb_chrind_tr = MT6370_REG_RGB_CHRIND_TR,
};

static const struct mt6370_pdata mt6372_pdata = {
	.tfreq = mt6372_tfreqs,
	.tfreq_len = ARRAY_SIZE(mt6372_tfreqs),
	.pwm_duty = MT6372_PWM_DUTY,
	.reg_rgb1_tr = MT6372_REG_RGB1_TR,
	.reg_rgb_chrind_tr = -1,
};

static enum mt6370_led_field mt6370_get_led_current_field(unsigned int led_no)
{
	switch (led_no) {
	case MT6370_LED_ISNK1:
		return F_LED1_CURR;
	case MT6370_LED_ISNK2:
		return F_LED2_CURR;
	case MT6370_LED_ISNK3:
		return F_LED3_CURR;
	default:
		return F_LED4_CURR;
	}
}

static int mt6370_set_led_brightness(struct mt6370_priv *priv, unsigned int led_no,
				     unsigned int level)
{
	enum mt6370_led_field sel_field;

	sel_field = mt6370_get_led_current_field(led_no);

	return regmap_field_write(priv->fields[sel_field], level);
}

static int mt6370_get_led_brightness(struct mt6370_priv *priv, unsigned int led_no,
				     unsigned int *level)
{
	enum mt6370_led_field sel_field;

	sel_field = mt6370_get_led_current_field(led_no);

	return regmap_field_read(priv->fields[sel_field], level);
}

static int mt6370_set_led_duty(struct mt6370_priv *priv, unsigned int led_no, unsigned int ton,
			       unsigned int toff)
{
	const struct mt6370_pdata *pdata = priv->pdata;
	enum mt6370_led_field sel_field;
	unsigned int divisor, ratio;

	divisor = pdata->pwm_duty;
	ratio = ton * divisor / (ton + toff);

	switch (led_no) {
	case MT6370_LED_ISNK1:
		sel_field = F_LED1_DUTY;
		break;
	case MT6370_LED_ISNK2:
		sel_field = F_LED2_DUTY;
		break;
	case MT6370_LED_ISNK3:
		sel_field = F_LED3_DUTY;
		break;
	default:
		sel_field = F_LED4_DUTY;
		break;
	}

	return regmap_field_write(priv->fields[sel_field], ratio);
}

static int mt6370_set_led_freq(struct mt6370_priv *priv, unsigned int led_no, unsigned int ton,
			       unsigned int toff)
{
	const struct mt6370_pdata *pdata = priv->pdata;
	enum mt6370_led_field sel_field;
	unsigned int tfreq_len = pdata->tfreq_len;
	unsigned int tsum, sel;

	tsum = ton + toff;

	if (tsum > pdata->tfreq[0] || tsum < pdata->tfreq[tfreq_len - 1])
		return -EOPNOTSUPP;

	sel = find_closest_descending(tsum, pdata->tfreq, tfreq_len);

	switch (led_no) {
	case MT6370_LED_ISNK1:
		sel_field = F_LED1_FREQ;
		break;
	case MT6370_LED_ISNK2:
		sel_field = F_LED2_FREQ;
		break;
	case MT6370_LED_ISNK3:
		sel_field = F_LED3_FREQ;
		break;
	default:
		sel_field = F_LED4_FREQ;
		break;
	}

	return regmap_field_write(priv->fields[sel_field], sel);
}

static void mt6370_get_breath_reg_base(struct mt6370_priv *priv, unsigned int led_no,
				       unsigned int *base)
{
	const struct mt6370_pdata *pdata = priv->pdata;

	if (pdata->reg_rgb_chrind_tr < 0) {
		*base = pdata->reg_rgb1_tr + led_no * 3;
		return;
	}

	switch (led_no) {
	case MT6370_LED_ISNK1:
	case MT6370_LED_ISNK2:
	case MT6370_LED_ISNK3:
		*base = pdata->reg_rgb1_tr + led_no * 3;
		break;
	default:
		*base = pdata->reg_rgb_chrind_tr;
		break;
	}
}

static int mt6370_gen_breath_pattern(struct mt6370_priv *priv, struct led_pattern *pattern, u32 len,
				     u8 *pattern_val, u32 val_len)
{
	enum mt6370_led_ranges sel_range;
	struct led_pattern *curr;
	unsigned int sel;
	u32 val = 0;
	int i;

	if (len < P_MAX_PATTERNS && val_len < P_MAX_PATTERNS / 2)
		return -EINVAL;

	/*
	 * Pattern list
	 * tr1:	 byte 0, b'[7:4]
	 * tr2:	 byte 0, b'[3:0]
	 * tf1:	 byte 1, b'[7:4]
	 * tf2:	 byte 1, b'[3:0]
	 * ton:	 byte 2, b'[7:4]
	 * toff: byte 2, b'[3:0]
	 */
	for (i = 0; i < P_MAX_PATTERNS; i++) {
		curr = pattern + i;

		sel_range = i == P_LED_TOFF ? R_LED_TOFF : R_LED_TRFON;

		linear_range_get_selector_within(priv->ranges + sel_range, curr->delta_t, &sel);

		if (i % 2) {
			val |= sel;
		} else {
			val <<= 8;
			val |= sel << 4;
		}
	}

	put_unaligned_be24(val, pattern_val);

	return 0;
}

static int mt6370_set_led_mode(struct mt6370_priv *priv, unsigned int led_no,
			       enum mt6370_led_mode mode)
{
	enum mt6370_led_field sel_field;

	switch (led_no) {
	case MT6370_LED_ISNK1:
		sel_field = F_LED1_MODE;
		break;
	case MT6370_LED_ISNK2:
		sel_field = F_LED2_MODE;
		break;
	case MT6370_LED_ISNK3:
		sel_field = F_LED3_MODE;
		break;
	default:
		sel_field = F_LED4_MODE;
		break;
	}

	return regmap_field_write(priv->fields[sel_field], mode);
}

static int mt6370_mc_brightness_set(struct led_classdev *lcdev, enum led_brightness level)
{
	struct led_classdev_mc *mccdev = lcdev_to_mccdev(lcdev);
	struct mt6370_led *led = container_of(mccdev, struct mt6370_led, mc);
	struct mt6370_priv *priv = led->priv;
	struct mc_subled *subled;
	unsigned int enable, disable;
	int i, ret;

	mutex_lock(&priv->lock);

	led_mc_calc_color_components(mccdev, level);

	ret = regmap_field_read(priv->fields[F_RGB_EN], &enable);
	if (ret)
		goto out_unlock;

	disable = enable;

	for (i = 0; i < mccdev->num_colors; i++) {
		u32 brightness;

		subled = mccdev->subled_info + i;
		brightness = min(subled->brightness, lcdev->max_brightness);
		disable &= ~MT6370_CHEN_BIT(subled->channel);

		if (level == 0) {
			enable &= ~MT6370_CHEN_BIT(subled->channel);

			ret = mt6370_set_led_mode(priv, subled->channel, MT6370_LED_REG_MODE);
			if (ret)
				goto out_unlock;

			continue;
		}

		if (brightness == 0) {
			enable &= ~MT6370_CHEN_BIT(subled->channel);
			continue;
		}

		enable |= MT6370_CHEN_BIT(subled->channel);

		ret = mt6370_set_led_brightness(priv, subled->channel, brightness);
		if (ret)
			goto out_unlock;
	}

	ret = regmap_field_write(priv->fields[F_RGB_EN], disable);
	if (ret)
		goto out_unlock;

	ret = regmap_field_write(priv->fields[F_RGB_EN], enable);

out_unlock:
	mutex_unlock(&priv->lock);

	return ret;
}

static int mt6370_mc_blink_set(struct led_classdev *lcdev,
			       unsigned long *delay_on,
			       unsigned long *delay_off)
{
	struct led_classdev_mc *mccdev = lcdev_to_mccdev(lcdev);
	struct mt6370_led *led = container_of(mccdev, struct mt6370_led, mc);
	struct mt6370_priv *priv = led->priv;
	struct mc_subled *subled;
	unsigned int enable, disable;
	int i, ret;

	mutex_lock(&priv->lock);

	if (!*delay_on && !*delay_off)
		*delay_on = *delay_off = 500;

	ret = regmap_field_read(priv->fields[F_RGB_EN], &enable);
	if (ret)
		goto out_unlock;

	disable = enable;

	for (i = 0; i < mccdev->num_colors; i++) {
		subled = mccdev->subled_info + i;

		disable &= ~MT6370_CHEN_BIT(subled->channel);

		ret = mt6370_set_led_duty(priv, subled->channel, *delay_on, *delay_off);
		if (ret)
			goto out_unlock;

		ret = mt6370_set_led_freq(priv, subled->channel, *delay_on, *delay_off);
		if (ret)
			goto out_unlock;

		ret = mt6370_set_led_mode(priv, subled->channel, MT6370_LED_PWM_MODE);
		if (ret)
			goto out_unlock;
	}

	/* Toggle to make pattern timing the same */
	ret = regmap_field_write(priv->fields[F_RGB_EN], disable);
	if (ret)
		goto out_unlock;

	ret = regmap_field_write(priv->fields[F_RGB_EN], enable);

out_unlock:
	mutex_unlock(&priv->lock);

	return ret;
}

static int mt6370_mc_pattern_set(struct led_classdev *lcdev, struct led_pattern *pattern, u32 len,
				 int repeat)
{
	struct led_classdev_mc *mccdev = lcdev_to_mccdev(lcdev);
	struct mt6370_led *led = container_of(mccdev, struct mt6370_led, mc);
	struct mt6370_priv *priv = led->priv;
	struct mc_subled *subled;
	unsigned int reg_base, enable, disable;
	u8 params[P_MAX_PATTERNS / 2];
	int i, ret;

	mutex_lock(&priv->lock);

	ret = mt6370_gen_breath_pattern(priv, pattern, len, params, sizeof(params));
	if (ret)
		goto out_unlock;

	ret = regmap_field_read(priv->fields[F_RGB_EN], &enable);
	if (ret)
		goto out_unlock;

	disable = enable;

	for (i = 0; i < mccdev->num_colors; i++) {
		subled = mccdev->subled_info + i;

		mt6370_get_breath_reg_base(priv, subled->channel, &reg_base);
		disable &= ~MT6370_CHEN_BIT(subled->channel);

		ret = regmap_raw_write(priv->regmap, reg_base, params, sizeof(params));
		if (ret)
			goto out_unlock;

		ret = mt6370_set_led_mode(priv, subled->channel, MT6370_LED_BREATH_MODE);
		if (ret)
			goto out_unlock;
	}

	/* Toggle to make pattern timing be the same */
	ret = regmap_field_write(priv->fields[F_RGB_EN], disable);
	if (ret)
		goto out_unlock;

	ret = regmap_field_write(priv->fields[F_RGB_EN], enable);

out_unlock:
	mutex_unlock(&priv->lock);

	return ret;
}

static inline int mt6370_mc_pattern_clear(struct led_classdev *lcdev)
{
	struct led_classdev_mc *mccdev = lcdev_to_mccdev(lcdev);
	struct mt6370_led *led = container_of(mccdev, struct mt6370_led, mc);
	struct mt6370_priv *priv = led->priv;
	struct mc_subled *subled;
	int i, ret;

	mutex_lock(&led->priv->lock);

	for (i = 0; i < mccdev->num_colors; i++) {
		subled = mccdev->subled_info + i;

		ret = mt6370_set_led_mode(priv, subled->channel, MT6370_LED_REG_MODE);
		if (ret)
			break;
	}

	mutex_unlock(&led->priv->lock);

	return ret;
}

static int mt6370_isnk_brightness_set(struct led_classdev *lcdev,
				      enum led_brightness level)
{
	struct mt6370_led *led = container_of(lcdev, struct mt6370_led, isink);
	struct mt6370_priv *priv = led->priv;
	unsigned int enable;
	int ret;

	mutex_lock(&priv->lock);

	ret = regmap_field_read(priv->fields[F_RGB_EN], &enable);
	if (ret)
		goto out_unlock;

	if (level == 0) {
		enable &= ~MT6370_CHEN_BIT(led->index);

		ret = mt6370_set_led_mode(priv, led->index, MT6370_LED_REG_MODE);
		if (ret)
			goto out_unlock;
	} else {
		enable |= MT6370_CHEN_BIT(led->index);

		ret = mt6370_set_led_brightness(priv, led->index, level);
		if (ret)
			goto out_unlock;
	}

	ret = regmap_field_write(priv->fields[F_RGB_EN], enable);

out_unlock:
	mutex_unlock(&priv->lock);

	return ret;
}

static int mt6370_isnk_blink_set(struct led_classdev *lcdev, unsigned long *delay_on,
				 unsigned long *delay_off)
{
	struct mt6370_led *led = container_of(lcdev, struct mt6370_led, isink);
	struct mt6370_priv *priv = led->priv;
	int ret;

	mutex_lock(&priv->lock);

	if (!*delay_on && !*delay_off)
		*delay_on = *delay_off = 500;

	ret = mt6370_set_led_duty(priv, led->index, *delay_on, *delay_off);
	if (ret)
		goto out_unlock;

	ret = mt6370_set_led_freq(priv, led->index, *delay_on, *delay_off);
	if (ret)
		goto out_unlock;

	ret = mt6370_set_led_mode(priv, led->index, MT6370_LED_PWM_MODE);

out_unlock:
	mutex_unlock(&priv->lock);

	return ret;
}

static int mt6370_isnk_pattern_set(struct led_classdev *lcdev, struct led_pattern *pattern, u32 len,
				   int repeat)
{
	struct mt6370_led *led = container_of(lcdev, struct mt6370_led, isink);
	struct mt6370_priv *priv = led->priv;
	unsigned int reg_base;
	u8 params[P_MAX_PATTERNS / 2];
	int ret;

	mutex_lock(&priv->lock);

	ret = mt6370_gen_breath_pattern(priv, pattern, len, params, sizeof(params));
	if (ret)
		goto out_unlock;

	mt6370_get_breath_reg_base(priv, led->index, &reg_base);

	ret = regmap_raw_write(priv->regmap, reg_base, params, sizeof(params));
	if (ret)
		goto out_unlock;

	ret = mt6370_set_led_mode(priv, led->index, MT6370_LED_BREATH_MODE);

out_unlock:
	mutex_unlock(&priv->lock);

	return ret;
}

static inline int mt6370_isnk_pattern_clear(struct led_classdev *lcdev)
{
	struct mt6370_led *led = container_of(lcdev, struct mt6370_led, isink);
	struct mt6370_priv *priv = led->priv;
	int ret;

	mutex_lock(&led->priv->lock);
	ret = mt6370_set_led_mode(priv, led->index, MT6370_LED_REG_MODE);
	mutex_unlock(&led->priv->lock);

	return ret;
}

static int mt6370_assign_multicolor_info(struct device *dev, struct mt6370_led *led,
					 struct fwnode_handle *fwnode)
{
	struct mt6370_priv *priv = led->priv;
	struct fwnode_handle *child;
	struct mc_subled *sub_led;
	u32 num_color = 0;
	int ret;

	sub_led = devm_kcalloc(dev, MC_CHANNEL_NUM, sizeof(*sub_led), GFP_KERNEL);
	if (!sub_led)
		return -ENOMEM;

	fwnode_for_each_child_node(fwnode, child) {
		u32 reg, color;

		ret = fwnode_property_read_u32(child, "reg", &reg);
		if (ret || reg > MT6370_LED_ISNK3 || priv->leds_active & BIT(reg)) {
			fwnode_handle_put(child);
			return -EINVAL;
		}

		ret = fwnode_property_read_u32(child, "color", &color);
		if (ret) {
			fwnode_handle_put(child);
			return dev_err_probe(dev, ret, "LED %d, no color specified\n", led->index);
		}

		priv->leds_active |= BIT(reg);
		sub_led[num_color].color_index = color;
		sub_led[num_color].channel = reg;
		sub_led[num_color].intensity = 0;
		num_color++;
	}

	if (num_color < 2)
		return dev_err_probe(dev, -EINVAL,
				     "Multicolor must include 2 or more LED channels\n");

	led->mc.num_colors = num_color;
	led->mc.subled_info = sub_led;

	return 0;
}

static int mt6370_init_led_properties(struct device *dev, struct mt6370_led *led,
				      struct led_init_data *init_data)
{
	struct mt6370_priv *priv = led->priv;
	struct led_classdev *lcdev;
	enum mt6370_led_ranges sel_range;
	u32 max_uA, max_level;
	int ret;

	if (led->index == MT6370_VIRTUAL_MULTICOLOR) {
		ret = mt6370_assign_multicolor_info(dev, led, init_data->fwnode);
		if (ret)
			return ret;

		lcdev = &led->mc.led_cdev;
		lcdev->brightness_set_blocking = mt6370_mc_brightness_set;
		lcdev->blink_set = mt6370_mc_blink_set;
		lcdev->pattern_set = mt6370_mc_pattern_set;
		lcdev->pattern_clear = mt6370_mc_pattern_clear;
	} else {
		lcdev = &led->isink;
		lcdev->brightness_set_blocking = mt6370_isnk_brightness_set;
		lcdev->blink_set = mt6370_isnk_blink_set;
		lcdev->pattern_set = mt6370_isnk_pattern_set;
		lcdev->pattern_clear = mt6370_isnk_pattern_clear;
	}

	ret = fwnode_property_read_u32(init_data->fwnode, "led-max-microamp", &max_uA);
	if (ret) {
		dev_warn(dev, "Not specified led-max-microamp, config to the minimum\n");
		max_uA = 0;
	}

	if (led->index == MT6370_LED_ISNK4)
		sel_range = R_LED4_CURR;
	else
		sel_range = R_LED123_CURR;

	linear_range_get_selector_within(priv->ranges + sel_range, max_uA, &max_level);

	lcdev->max_brightness = max_level;

	led->default_state = led_init_default_state_get(init_data->fwnode);

	return 0;
}

static int mt6370_isnk_init_default_state(struct mt6370_led *led)
{
	struct mt6370_priv *priv = led->priv;
	unsigned int enable, level;
	int ret;

	ret = mt6370_get_led_brightness(priv, led->index, &level);
	if (ret)
		return ret;

	ret = regmap_field_read(priv->fields[F_RGB_EN], &enable);
	if (ret)
		return ret;

	if (!(enable & MT6370_CHEN_BIT(led->index)))
		level = 0;

	switch (led->default_state) {
	case LEDS_DEFSTATE_ON:
		led->isink.brightness = led->isink.max_brightness;
		break;
	case LEDS_DEFSTATE_KEEP:
		led->isink.brightness = min(level, led->isink.max_brightness);
		break;
	default:
		led->isink.brightness = 0;
		break;
	}

	return mt6370_isnk_brightness_set(&led->isink, led->isink.brightness);
}

static int mt6370_multicolor_led_register(struct device *dev, struct mt6370_led *led,
					  struct led_init_data *init_data)
{
	int ret;

	ret = mt6370_mc_brightness_set(&led->mc.led_cdev, 0);
	if (ret)
		return dev_err_probe(dev, ret, "Couldn't set multicolor brightness\n");

	ret = devm_led_classdev_multicolor_register_ext(dev, &led->mc, init_data);
	if (ret)
		return dev_err_probe(dev, ret, "Couldn't register multicolor\n");

	return 0;
}

static int mt6370_led_register(struct device *dev, struct mt6370_led *led,
			       struct led_init_data *init_data)
{
	struct mt6370_priv *priv = led->priv;
	int ret;

	if (led->index == MT6370_VIRTUAL_MULTICOLOR)
		return mt6370_multicolor_led_register(dev, led, init_data);

	/* If ISNK4 is declared, change its mode from HW auto to SW control */
	if (led->index == MT6370_LED_ISNK4) {
		ret = regmap_field_write(priv->fields[F_CHGIND_EN], 1);
		if (ret)
			return dev_err_probe(dev, ret, "Failed to set CHRIND to SW\n");
	}

	ret = mt6370_isnk_init_default_state(led);
	if (ret)
		return dev_err_probe(dev, ret, "Failed to init %d isnk state\n", led->index);

	ret = devm_led_classdev_register_ext(dev, &led->isink, init_data);
	if (ret)
		return dev_err_probe(dev, ret, "Couldn't register isink %d\n", led->index);

	return 0;
}

static int mt6370_check_vendor_info(struct mt6370_priv *priv)
{
	unsigned int devinfo, vid;
	int ret;

	ret = regmap_read(priv->regmap, MT6370_REG_DEV_INFO, &devinfo);
	if (ret)
		return ret;

	vid = FIELD_GET(MT6370_VENDOR_ID_MASK, devinfo);
	if (vid == MT6372_VENDOR_ID || vid == MT6372C_VENDOR_ID) {
		priv->reg_fields = mt6372_reg_fields;
		priv->ranges = mt6372_led_ranges;
		priv->pdata = &mt6372_pdata;
	} else {
		/* Common for MT6370/71 */
		priv->reg_fields = common_reg_fields;
		priv->ranges = common_led_ranges;
		priv->pdata = &common_pdata;
	}

	return 0;
}

static int mt6370_leds_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct mt6370_priv *priv;
	struct fwnode_handle *child;
	size_t count;
	unsigned int i = 0;
	int ret;

	count = device_get_child_node_count(dev);
	if (!count || count > MT6370_MAX_LEDS)
		return dev_err_probe(dev, -EINVAL,
				     "No child node or node count over max LED number %zu\n",
				      count);

	priv = devm_kzalloc(dev, struct_size(priv, leds, count), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	priv->leds_count = count;
	mutex_init(&priv->lock);

	priv->regmap = dev_get_regmap(dev->parent, NULL);
	if (!priv->regmap)
		return dev_err_probe(dev, -ENODEV, "Failed to get parent regmap\n");

	ret = mt6370_check_vendor_info(priv);
	if (ret)
		return dev_err_probe(dev, ret, "Failed to check vendor info\n");

	ret = devm_regmap_field_bulk_alloc(dev, priv->regmap, priv->fields, priv->reg_fields,
					   F_MAX_FIELDS);
	if (ret)
		return dev_err_probe(dev, ret, "Failed to allocate regmap field\n");

	device_for_each_child_node(dev, child) {
		struct mt6370_led *led = priv->leds + i++;
		struct led_init_data init_data = { .fwnode = child };
		u32 reg, color;

		ret = fwnode_property_read_u32(child, "reg", &reg);
		if (ret) {
			dev_err(dev, "Failed to parse reg property\n");
			goto fwnode_release;
		}

		if (reg >= MT6370_MAX_LEDS) {
			ret = -EINVAL;
			dev_err(dev, "Error reg property number\n");
			goto fwnode_release;
		}

		ret = fwnode_property_read_u32(child, "color", &color);
		if (ret) {
			dev_err(dev, "Failed to parse color property\n");
			goto fwnode_release;
		}

		if (color == LED_COLOR_ID_RGB || color == LED_COLOR_ID_MULTI)
			reg = MT6370_VIRTUAL_MULTICOLOR;

		if (priv->leds_active & BIT(reg)) {
			ret = -EINVAL;
			dev_err(dev, "Duplicate reg property\n");
			goto fwnode_release;
		}

		priv->leds_active |= BIT(reg);

		led->index = reg;
		led->priv = priv;

		ret = mt6370_init_led_properties(dev, led, &init_data);
		if (ret)
			goto fwnode_release;

		ret = mt6370_led_register(dev, led, &init_data);
		if (ret)
			goto fwnode_release;
	}

	return 0;

fwnode_release:
	fwnode_handle_put(child);
	return ret;
}

static const struct of_device_id mt6370_rgbled_device_table[] = {
	{ .compatible = "mediatek,mt6370-indicator" },
	{}
};
MODULE_DEVICE_TABLE(of, mt6370_rgbled_device_table);

static struct platform_driver mt6370_rgbled_driver = {
	.driver = {
		.name = "mt6370-indicator",
		.of_match_table = mt6370_rgbled_device_table,
	},
	.probe = mt6370_leds_probe,
};
module_platform_driver(mt6370_rgbled_driver);

MODULE_AUTHOR("Alice Chen <alice_chen@richtek.com>");
MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>");
MODULE_DESCRIPTION("MediaTek MT6370 RGB LED Driver");
MODULE_LICENSE("GPL");